Outlet clearance adjustment mechanism of jaw crusher and self-propelled crushing machine loaded with jaw crusher having outlet clearance adjustment mechanism of jaw crusher

TECHNICAL FIELD

The present invention relates to an outlet clearance adjustment mechanism for adjusting an outlet clearance between a stationary jaw and a movable jaw of a jaw crusher, and a self-propelled crushing machine loaded with a jaw crusher having the outlet clearance adjustment mechanism.

BACKGROUND ART

An example of a jaw crusher will be explained with reference to a self-propelled jaw crusher

1

shown in FIG.

7

. In

FIG. 7

, a traveling body

2

is loaded with a hopper

3

, a feeder

4

, a jaw crusher

10

, and a belt conveyor

5

. The jaw crusher

10

includes a stationary jaw

11

and a movable jaw

12

swingingly moves relative thereto, which form a V shape with a wide upper portion. A material

6

to be crushed such as a concrete block, rock, stone or the like is charged into the hopper

3

, transferred to an upper portion of the jaw crusher

10

by the feeder

10

, then crushed inside the jaw crusher

10

, and discharged outside from a lower outlet by the belt conveyor

5

to be a product. The grain diameter of a crushed product is determined by an outlet clearance δ between the stationary jaw

11

and the movable jaw

12

. When the stationary jaw

11

and the movable jaw

12

are worn as a result of continuing crushing for a long time, or the grain diameter of the crushed product is to be changed, it is necessary to accurately readjust the outlet clearance δ. Thus, jaw crushers generally include outlet clearance adjustment mechanisms.

Various kinds of outlet clearance adjustment mechanisms of jaw crushers are conventionally proposed, and those disclosed in, for example, Japanese Utility Model Laid-open No. 63-141638, Japanese Utility Model Laid-open No. 63-141639, and International Application Laid-open No. WO97/36683 are well known.

FIG. 8

is a side view of what is disclosed in Japanese Utility Model Laid-open No. 63-141638 as the first example. At a guide

60

provided at a frame

7

, to which the stationary jaw

11

of the jaw crusher

10

is mounted, at a back side of the movable jaw

12

, a toggle block

61

is disposed slidably toward the movable jaw

12

. A tip end portion of a toggle plate

13

abuts a first abutment portion

14

provided at a lower portion of the back of the movable jaw

12

. A base end portion of the toggle plate

13

abuts a second abutment portion

15

provided at a front portion of the toggle block

61

. An oil hydraulic cylinder

64

including a hydraulic mechanical lock device

62

at a piston rod

63

side is fixedly provided at the frame

7

at a back side of the toggle block

61

. A tip end portion of the piston rod

63

abuts the back of the toggle block

61

via a roller

65

. A pre-tension device

20

for always biasing the lower portion of the movable jaw

12

toward the toggle block

61

and holding the toggle plate

13

between the first abutment portion

14

and the second abutment portion

15

is provided between the movable jaw

12

and the frame

7

. The pre-tension device

20

is constituted by a spring

23

held between a bracket

21

fixed to the frame

7

and a washer

24

, and a rod

22

connected to a lower end portion of the moving jaw

12

at one end and penetrating through the spring

23

and the washer

24

and fastened by a nut

25

at the other end. The movable jaw

12

is supported at the frame

7

via an eccentric shaft

16

at an upper end portion, so that rotation of the eccentric shaft

16

swings the movable jaw

12

.

During an operation of the jaw crusher

10

, the hydraulic mechanical lock device

62

is locked. When the outlet clearance between the stationary jaw

11

and the movable jaw

12

is to be adjusted, a worker operates a hydraulic device (not shown) to release the lock of the hydraulic mechanical lock device

62

. Thereafter, the outlet clearance is adjusted by extending or contracting the hydraulic cylinder

64

, and then the hydraulic mechanical lock device

62

is locked again.

FIG. 9

is a side view of what is disclosed in Japanese Utility Model Laid-open No. 63-141639 as the second example. The explanation of the same components as the first example is omitted by giving the identical numerals and symbols, and only the different parts will be explained. An oil hydraulic cylinder

72

including a hydraulic mechanical lock device

71

is horizontally attached at a back side of a U-shaped bracket

70

fixedly provided at the frame

7

at the back side of the movable jaw

12

, and the oil hydraulic cylinder

72

is connected to a rear end portion of a toggle block

73

. An adjustment plate

74

is inserted between the bracket

70

and the toggle block

73

. An upper oil hydraulic cylinder

76

including the hydraulic mechanical lock device

71

is attached upright at a bracket

75

fixedly provided at the frame

7

above the toggle block

73

. The upper oil hydraulic cylinder

76

is connected to the toggle block

73

to pull it upward and fix it. The upper oil hydraulic cylinder

76

is movable in a substantially horizontal direction toward the movable jaw

12

, and is attachably and detachably fastened to the bracket

75

by a bolt

77

.

During an operation of the jaw crusher

10

, the toggle block

73

, the adjustment plate

74

, and the bracket

70

are in close contact with each other, and the hydraulic mechanical lock devices

71

and

71

are locked. When the outlet clearance is to be adjusted, a worker operates a hydraulic device (not shown) to release the lock of the hydraulic mechanical lock devices

71

of the oil hydraulic cylinder

72

and the upper oil hydraulic cylinder

76

. Next, the bolt

77

of the upper oil hydraulic cylinder

76

is loosened to extend the upper oil hydraulic cylinder

76

a little. Subsequently, the oil hydraulic cylinder

72

is extended or contracted to adjust the thickness of the adjustment plate

74

to thereby adjust the outlet clearance, and the oil hydraulic cylinder

72

is contracted to bring the adjustment plate

74

in close contact. Next, the upper hydraulic cylinder

76

is contracted, then the bolt

77

is fastened, and the respective oil hydraulic mechanical lock devices

71

and

71

are locked.

FIG. 10

is a side view of the outlet clearance adjustment apparatus disclosed in International Application Laid-open WO97/36683 as the third example, and

FIG. 11

is a view seen from the arrows

11

—

11

in FIG.

10

. The same components as the first example are given the identical numerals and symbols, the explanation thereof will be omitted, and only the different parts will be explained. In FIG.

10

and

FIG. 11

, a downward inclined plane

31

with a lower portion being protruded is formed on a surface of the toggle block

30

opposite to the toggle plate

13

. A mounting surface

33

for mounting a toggle block

30

thereon slidably toward the movable jaw

12

is provided on a toggle block frame

32

fixedly provided at the frame

7

. Further, an inclined plane

34

matching the aforementioned downward inclined plane

31

of the toggle block

30

is provided on a surface of the toggle block frame

32

opposing the toggle block

30

to form a V-shaped opening portion

35

with the mounting surface

33

. A clearance adjustment shim

36

is inserted between the downward inclined plane

31

of the toggle block

30

and the inclined plane

34

of the toggle block frame

32

. A pair of oil hydraulic cylinders

80

and

80

are attached at the toggle block frame

32

, and piston rods

81

and the toggle block

30

at the side of the downward inclined place

31

are connected by connecting pins

82

. The pre-tension device

20

is provided between the movable jaw

12

and the toggle block frame

32

.

FIG. 12

is an oil hydraulic circuit diagram of the clearance adjustment apparatus of the third example. An output circuit of an oil hydraulic source

83

, and a head side circuit

85

and a bottom side circuit

88

of the oil hydraulic cylinder

80

are connected via an electromagnetic change-over valve

84

. The electromagnetic change-over valve

84

has three positions f, g, and h. The oil hydraulic cylinder

80

is contracted at the position f, the oil hydraulic cylinder

80

is held at the position g, and the oil hydraulic cylinder

80

is extended at the position h. An accumulator

86

and a pressure switch

87

are connected to the head side circuit

85

of the oil hydraulic cylinder

80

. An operation lever

57

, the electromagnetic change-over valve

84

, and a pressure switch

87

are connected via a controller

58

.

Next, an operation will be explained based on FIG.

10

and FIG.

12

. During a crushing operation, the electromagnetic valve

84

is at the position g, and the head side circuit

85

and the bottom side circuit

88

of the oil hydraulic cylinder

80

are closed. When the outlet clearance is to be adjusted, a worker operates the operation lever

57

to switch the electromagnetic change-over valve

84

to the position h by a command signal from the controller

58

to thereby extend the oil hydraulic cylinder

80

. Next, the clearance adjustment shim

36

is adjusted to determine the position of the toggle block

30

to thereby set the outlet clearance. Subsequently, the operation lever

57

is operated to switch the electromagnetic change-over valve

84

to the position f to thereby contract the oil hydraulic cylinder

80

, whereby the toggle block

30

, the clearance adjustment shim

36

and the toggle block frame

32

are in close contact with each other.

FIG. 13

is a plane view of the conventional outlet clearance adjustment mechanism being the fourth example. Since the relationship between the toggle block frame

32

and the toggle block

30

is the same as that of the third example, the explanation with a side view will be omitted and only the different parts will be explained. In

FIG. 13

, the same components as in the third example are given the same numerals and symbols. An oil hydraulic cylinder

90

attached to a center portion of the toggle block frame

32

are connected to the toggle block

30

. A pair of tension rods

91

and

91

for connecting the toggle block

30

and the toggle block frame

32

are provided at the left and right side of the oil hydraulic cylinder

90

. Double nuts

92

and

92

are fastened to rear end portions of the tension rods

91

and

91

, whereby the toggle block

30

is brought into close contact with the toggle block frame

32

.

The oil hydraulic cylinder

90

is in a floating state during a crushing operation, with the double nuts

92

being fastened. When the outlet clearance is to be adjusted, the double nuts

92

and

92

are loosened to extend the oil hydraulic cylinder

90

, and the thickness of the clearance adjustment shim

36

is adjusted to determine the position of the toggle block

30

. Next, the oil hydraulic cylinder

90

is contracted to bring the toggle block

30

, the clearance adjustment shim

36

and the toggle block frame

32

into close contact with each other to be in a floating state, and thereafter the double nuts,

92

and

92

are fastened.

However, in the aforementioned conventional structures, the following disadvantages exist.

(a) In the first example, all the large thrust forces applied to the toggle plate

13

during a crushing operation is applied to the hydraulic mechanical lock device

62

and the oil hydraulic cylinder

64

. Consequently, the hydraulic mechanical lock device

62

and the oil hydraulic cylinder

64

with large capacity are required, thus increasing the apparatus in size, whereby the cost becomes high.

(b) In the second example, the upper oil hydraulic cylinder

76

in the vertical direction is required, and it is necessary to loosen the bolt

77

and extend the upper oil hydraulic cylinder

76

every time the outlet clearance is adjusted and it is necessary to contract the upper oil hydraulic cylinder

76

again and fasten the bolts

77

after the adjustment is finished, thus requiring a long time for adjustment. In addition, the number of components are large, and the cost is high with the complicated structure.

(c) In the third example, as shown in the side view in FIG.

10

and the oil hydraulic circuit diagram in

FIG. 12

, when a clearance exists in the clearance adjustment shim

36

, all the thrust forces applied to the toggle block

30

is applied to the bottom side of the oil hydraulic cylinder

80

. Consequently, if a mistake is made in operating the operation lever

57

at the time of the clearance adjustment and a clearance exists in the portion into which the clearance adjustment shim

36

is inserted, there is the fear that a bottom side pipeline

88

of the oil hydraulic cylinder

80

is broken when a large thrust force is applied to the toggle block

30

.

(d) In the fourth example, the tension rods

91

and

91

, and the double nuts

92

and

92

are provided for fixing the position of the toggle block

30

. As a result, each time when the clearance is adjusted, the operation of loosening the double nuts

92

and

92

and fastening them again after the adjustment is required, thus requiring a long working time. The working time reaches, for example, thirty minutes or more.

SUMMARY OF THE INVENTION

The present invention is made in view of the aforementioned disadvantages, and its object is to provide an outlet clearance adjustment mechanism of a jaw crusher, which is compact, simple in structure, without the fear of breakage, and capable of reduce outlet clearance adjusting time, and a self-propelled crushing machine loaded with a jaw crusher having the outlet clearance adjustment mechanism.

In order to attain the aforementioned object, an outlet clearance adjustment apparatus of a jaw crusher according to the present invention includes a stationary jaw mounted to a frame, a movable jaw which faces the stationary jaw and swingingly moves, a toggle block placed at a back of the movable jaw and abutting the movable jaw via a toggle block plate, and a toggle block frame fixedly provided at the frame and supporting the toggle block, and has a constitution in that the toggle block has a downward inclined plane with a lower portion being protruded on a face at an opposite side to the toggle plate, the toggle block frame has a mounting surface on which the toggle block having the downward inclined plane is slidably mounted, and an inclined plane provided to oppose the downward inclined plane, and the outlet clearance adjustment mechanism includes a detachable clearance adjustment shim provided between the downward inclined plane and the inclined plane opposing each other, and a hydraulic type of mechanical lock cylinder provided at a back side of the inclined plane of the toggle block frame, and adjusts an outlet clearance between the stationary jaw and the movable jaw.

According to the above constitution, the downward inclined plane is provided on the toggle block to be fitted onto the inclined plane of the frame, and therefore when thrust force is applied to the toggle block, downward force occurs to the toggle block. Thus, a vertical hydraulic cylinder is not necessary, thus making the structure simple. Further, since the inclined plane of the frame receives thrust force, the capacity of the hydraulic type of mechanical lock cylinder may be small, thus making it possible to reduce the apparatus in size. Even if the clearance adjustment shim portion has a clearance at the time of adjustment, the hydraulic type of mechanical lock cylinder slides to cause the inclined plane to abut it, and thus there is no fear of breakage. Further, since the outlet clearance adjustment can be performed only by extending and contracting the hydraulic type of mechanical lock cylinder, the operation is simple and adjusting time is short, which is efficient.

Further, a self-propelled crushing machine loaded with a jaw crusher having the outlet clearance adjustment mechanism of the jaw crusher according to the present invention has a constitution in which a jaw crusher having the outlet clearance adjustment mechanism of the jaw crusher of the aforementioned constitution is mounted on a self-propelled vehicle.

According to the above constitution, the jaw crusher having the outlet clearance adjustment mechanism of the present invention is movable, whereby the operation can be performed in the sites where it is required, thus enhancing efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1

is a partially sectional side view of an outlet clearance adjustment mechanism of the present invention;

FIG. 2

is a view seen from the arrows

2

—

2

in

FIG. 1

;

FIG. 3

is a view seen from the arrows

3

—

3

in

FIG. 2

;

FIG. 4

is a sectional side view of a hydraulic type of mechanical lock cylinder according to the present invention;

FIG. 5

is an explanatory view of an operation of the hydraulic type of mechanical lock cylinder according to the present invention;

FIG. 6

is a hydraulic circuit diagram of the outlet clearance adjustment mechanism of the present invention;

FIG. 7

is a partially sectional side view of a conventional self-propelled jaw crusher;

FIG. 8

is a sectional side view of a conventional outlet clearance adjustment mechanism being a first example;

FIG. 9

is a sectional side view of a conventional outlet clearance adjustment mechanism being a second example;

FIG. 10

is a sectional side view of a conventional outlet clearance adjustment mechanism being a third example;

FIG. 11

is a view seen from the arrows

11

—

11

in

FIG. 10

;

FIG. 12

is a hydraulic circuit diagram of the conventional outlet clearance adjustment mechanism being the third example; and

FIG. 13

is a plane view of a conventional outlet clearance adjustment mechanism being a fourth example.

BEST MODE FOR CARRYING OUT THE INVENTION

A preferred embodiment of an outlet clearance adjustment mechanism of a jaw crusher and a self-propelled crushing machine loaded with a jaw crusher having the outlet clearance adjustment mechanism according to the present invention will be explained in detail below with reference to the drawings.

FIG. 1

is a side view showing an example of the outlet clearance adjustment mechanism of the present invention, and

FIG. 2

is a view seen from the arrows

2

—

2

in FIG.

1

. In FIG.

1

and

FIG. 2

, a stationary jaw

11

is mounted to a frame

7

of a jaw crusher

10

, and a movable jaw

12

is swingably attached to face it by an eccentric shaft

16

. A toggle block frame

32

is fixedly provided at the frame

7

at a back side of the movable jaw

12

to slidably support a toggle block

30

. A tip end portion of a toggle plate

13

abuts a first abutment portion

14

provided at a lower end portion of a back of the movable jaw

12

, and a rear end portion of the toggle plate

13

abuts a second abutment portion

15

provided at a front of the toggle block

30

. A downward inclined plane

31

with a lower portion being protruded is formed on a rear face of the toggle block

30

. The toggle block frame

32

forms a V-shaped opening

35

by a mounting surface

33

for mounting the toggle block

30

thereon slidably toward the back of the movable jaw

12

, and an inclined plane

34

matching the downward inclined plane

31

of the toggle block

30

, which is provided on a surface facing the toggle block

30

. A clearance adjustment shim

36

is inserted between the downward inclined plane

31

and the inclined plane

34

. A pair of hydraulic type of mechanical lock cylinders

40

and

40

are attached at a back side of the inclined plane

34

of the toggle block frame

32

. Pre-tension devices

20

and

20

for biasing a lower end portion of the movable jaw

12

toward the toggle block

30

all the time are provided at both sides of the hydraulic type of mechanical lock cylinders

40

and

40

.

As shown in

FIG. 2

, the pre-tension device

20

includes a spring

23

abutting a bracket

21

fixedly provided at the toggle block

30

, a washer

24

abutting a rear end portion of the spring

23

, a rod

22

connected to a lower portion of the movable jaw

12

at one end and penetrating through the aforementioned spring

23

and the washer

24

at the other end, and a nut

25

for fastening the rod

22

to the washer

24

. As shown in

FIG. 3

being a view seen from the arrows

3

—

3

in

FIG. 2

, a piston rod

41

of the hydraulic type of mechanical lock cylinder

40

is connected to the toggle block

30

by a connecting pin

42

.

FIG. 4

is a sectional view of the hydraulic type of mechanical lock cylinder

40

. A piston

44

having the piston rod

41

is press-fitted in the cylinder

43

. The piston rod

41

is provided with an oil hole

45

, which is communicated with an outside surface of the piston

44

.

FIG. 4

shows a state in which pressure oil is not supplied into the oil hole

45

from the outside, and in this state, the piston

44

is fixed in the position with frictional resistance between the piston

44

and the cylinder

43

. When the hydraulic type of mechanical lock cylinder

40

is to be extended and contracted, the pressure oil is supplied into the oil hole

45

to expand the cylinder

43

on the outer surface portion of the piston

44

as a portion P to thereby expand the inner diameter as shown in FIG.

5

. This expansion reduces the frictional resistance between the piston

44

and the cylinder

43

to reduce the press fit force of the piston

44

, whereby pressure oil is supplied into a cylinder head chamber

46

or a cylinder bottom chamber

47

to allow the piston

44

to move.

FIG. 6

is an oil hydraulic circuit diagram of the outlet clearance adjustment mechanism of the present invention. In

FIG. 6

, a first electromagnetic change-over valve

52

is provided on a piston circuit

51

connecting the oil hole

45

of the piston rod

41

of the hydraulic type of mechanical lock cylinder

40

and a first oil pressure source

50

. A second electromagnetic change-over valve

56

is provided on a head circuit

54

and a bottom circuit

55

for connecting the hydraulic type of mechanical lock cylinder

40

and a second oil pressure source

53

. The first electromagnetic change-over valve

52

has two positions a and b. In the position a, the piston circuit

51

is connected to a tank

59

, and in the position b, it is connected to a discharge circuit of the first oil pressure source

50

. The second electromagnetic valve

56

has three positions c, d and e. In the position c, the head circuit

54

is connected to the second oil pressure source

53

, in the position d, the head circuit

54

and the bottom circuit

55

are connected to the tank

59

, and in the position e, the bottom circuit

55

is connected to the second oil pressure source

50

. An operation lever

57

connects to the first electromagnetic change-over valve

52

and the second electromagnetic change-over valve

56

via a controller

58

.

Next, an operation will be explained. During a crushing operation, the downward inclined plane

31

abuts the inclined plane

34

of the toggle block frame

32

via the clearance adjustment shim

36

. The hydraulic type of mechanical lock cylinder

40

is in a state in which it is locked. Accordingly, the toggle block frame

32

receives large thrust force from the movable jaw

12

, and rattling in a longitudinal direction of the toggle block

30

is prevented by the hydraulic type of mechanical lock cylinder

40

. When the outlet clearance is to be adjusted, the operation lever

57

is operated to output a control signal to the first electromagnetic change-over valve

52

from the controller

58

to switch the first electromagnetic change-over valve

52

to the position b, whereby pressure oil is supplied to the piston

44

of the hydraulic type of mechanical lock cylinder

40

via the piston circuit

51

to expand the cylinder

43

. Next, the operation lever

57

is operated to output the control signal to the second electromagnetic valve

56

from the controller

58

to switch it to the position e, whereby the pressure oil is supplied to the bottom circuit

55

to extend the hydraulic type of mechanical lock cylinder

40

. Subsequently, the thickness of the clearance adjustment shim

36

is adjusted to thereby adjust the outlet clearance. Next, the operation lever

57

is operated to switch the second electromagnetic change-over valve

56

to the position c, whereby the pressure oil is supplied to the head circuit

54

to contract the hydraulic type of mechanical lock cylinder

40

to thereby bring the toggle block

30

, the clearance adjustment shim

36

, and the inclined plane

34

of the toggle block frame

32

in close contact with each other. Next, the first electromagnetic change-over valve

52

is switched to the position a, whereby the clearance adjustment operation is finished.

The clearance adjustment operation is simple as described above, and the operating time is only about three minutes by a person, which is sharp reduction in the operating time as compared with the aforementioned

30

minutes cited as an example of the prior arts. Since the head circuit

54

and the bottom circuit

55

of the hydraulic type of mechanical lock cylinder

40

are connected to a drain circuit during the crushing operation, abnormal oil pressure does not occur to the head circuit

54

and the bottom circuit

55

, thus eliminating the fear of breakage. Further, the hydraulic type of mechanical lock cylinder

40

is used only for preventing the toggle block

30

from rattling and for moving the toggle block

30

on the occasion of outlet clearance adjustment, and therefore a small-sized cylinder is sufficient, thus making it possible to reduce the size and cost of the apparatus.

In the above, the embodiment of the outlet clearance adjustment mechanism of the jaw crusher is explained, and it is useful to mount a jaw crusher having the outlet clearance adjustment mechanism of the embodiment according to the above described present invention and use it as the self-propelled crushing machine. Here, as the self-propelled vehicle, any ordinary self-propelled vehicle may be suitable. As a result of the above, it becomes movable, whereby operation in the sites where it is required becomes possible, thus enhancing efficiency. As a concrete example of the self-propelled crushing machine, it may be suitable to mount the jaw crusher

10

having the outlet clearance adjustment mechanism of the above-described embodiment according to the present invention in place of the conventional jaw crusher

10

in the self-propelled jaw crusher

1

shown in FIG.

7

.

Number	Date	Country
63-141638	Sep 1988	JP
63-141639	Sep 1988	JP
WO9736683	Oct 1997	WO

Outlet clearance adjustment mechanism of jaw crusher and self-propelled crushing machine loaded with jaw crusher having outlet clearance adjustment mechanism of jaw crusher

Information

Patent Number

Date Filed

Date Issued

Inventors

Original Assignees

Examiners

Agents

CPC

US Classifications

Field of Search

US

International Classifications

Abstract

Description

Claims

Priority Claims (1)

US Referenced Citations (1)

Foreign Referenced Citations (3)