Patent Grant
11673181
This application claims the benefit of priority from Chinese Patent Application No. 201910753285.9, filed on Aug. 15, 2019. The content of the aforementioned application, including any intervening amendments thereto, is incorporated herein by reference in its entirety.
The present application belongs to the technical field of forging machinery, and particularly relates to a device for installing and adjusting a sliding block of a multipoint crank press and a method for using the same.
Multipoint presses play an important role in the heavy machinery machining industry and are widely used. The press achieves the forming of parts by exerting strong pressure on metal blanks to cause plastic deformation and fracture of metals.
However, it is found that in actual production process, due to a connection gap among various parts of the press and errors left from the installation and machining process, a bottom surface of a sliding block is not in line with a working table, and a column guide rail is not exactly vertical to the working table, typically as shown in
In order to overcome the defects in the prior art, an objective of the present application is to provide a safe, efficient, low-cost and high-precision device for installing and adjusting a sliding block of a multipoint crank press.
The technical solution adopted by the present application for solving the technical problems in the prior art is as follows:
A device for adjusting a sliding block of a multipoint crank press, where the device comprises a crank, a sliding block, connecting rods, and eccentric pin shaft micro-adjustment mechanisms;
each of the eccentric pin shaft micro-adjustment mechanism includes an eccentric pin shaft, a large bevel gear and a small bevel gear; wherein one end of the eccentric pin shaft is provided with a positioning part, and an eccentric part is disposed at the position on the eccentric pin shaft close to the positioning part;
one end of the connecting rod is connected to the crank, the other end of the connecting rod is provided with a U-shaped notch, the eccentric pin shaft passes through holes in two side walls of the U-shaped notch, and the holes in the two side walls of the U-shaped notch are in clearance fit with the eccentric pin shaft;
one side wall of the U-shaped notch of the connecting rod is in detachable clearance fit connection with one side of the positioning part of the eccentric pin shaft; the sliding block is mounted on the eccentric part in a clearance fit mode, and an upper portion of the sliding block is positioned in the U-shaped notch;
to fix the large bevel gear, the other side wall of the U-shaped notch of the connecting rod is detachably connected to the large bevel gear; the large bevel gear sleeves the eccentric pin shaft, the large bevel gear is meshed with the small bevel gear, and an axis of the small bevel gear perpendicularly intersects with an axis of the eccentric pin shaft; a central shaft of the small bevel gear passes through a hole of the eccentric pin shaft, and both ends are fixed by a first nut and a second nut.
Further, a dial is also mounted on an end face of the large bevel gear; an adjusting pointer is mounted on an end face of the small bevel gear, and the adjusting pointer is matched with the dial.
Further, an eccentric radius of the eccentric pin shaft is 0.1-1 mm.
Further, the positioning part and the eccentric pin shaft are integrally formed.
Further, one side wall of the U-shaped notch is fixed to the positioning part of the eccentric pin shaft through first bolts; and the other side wall of the U-shaped notch is fixed to the large bevel gear through second bolts.
Further, an axial end face of the small bevel gear is provided with a shaft sleeve coaxial with the small bevel gear, and the axial end face of the small bevel gear and the eccentric pin shaft are axially positioned through the shaft sleeve.
Further, the first nut is disposed at one end of the central shaft provided with the small bevel gear to facilitate rotation of the small bevel gear; a second end of the central shaft of the small bevel gear is provided with a thread, and matched with a second nut after passing through the eccentric pin shaft; and the central shaft of the small bevel gear, the small bevel gear and the first nut are integrally machined.
The present invention also provides a method for adjusting of a multipoint crank press a multipoint crank press by using the foregoing device for adjusting a sliding block, including:
determining an initial position of each of an eccentric pin shaft micro-adjustment mechanism after machining and installing the crank, the connecting rod and the sliding block of the multipoint crank press through a machining and installation process by the following process comprising:
adjusting each of straight lines of eccentric radii of eccentric pin shafts to a horizontal plane relative to ground, where every two of the straight lines of the eccentric radii of different positions point to opposite directions to eliminate the lateral force generated by different the eccentric pin shafts on the sliding block; rotating the position of a dial to make a reading of an adjusting pointer be zero and make the adjusting pointer point right above perpendicular to the horizontal plane, fixing the dial to the large bevel gear, fixing the large bevel gear to the connecting rod by second bolts, and fixing the pointer to a movable small bevel gear;
by turning the crank, thereby moving the connecting rod, and thereby moving the sliding block to a bottom dead center, eliminating a gap among the crank, the sliding block, the connecting rods and eccentric pin shaft micro-adjustment mechanisms by using the loading by a hydraulic loader of the multipoint crank press, measuring a nonparallelism between a lower surface of the sliding block and an upper surface of a working table, and adjusting the eccentric pin shaft through unloading, repeating the foregoing process of measuring a nonparallelism between a lower surface of the sliding block and an upper surface of a working table, adjusting the eccentric pin shaft through unloading until a precision threshold for assembly and operation of the multipoint crank press is met, and fixing the eccentric pin shaft to the connecting rod.
Specifically, the sliding block of the multipoint press runs to the bottom dead center, and loading at a geometric center position of the lower surface of the sliding block by the hydraulic loader, where the loading force is 15%-50% of the nominal pressure of the multipoint crank press. With a first center of a connection position of a first set of crank, connecting rod and sliding block as a reference, a difference between a reading of a second center of a connection position of another set of crank, connecting rod and sliding block and a measured value of a reference position is measured using a dial gauge, and then unloading is performed. Other positions of other sets of eccentric positions and directions of the eccentric pin shafts on cranks, connecting rods and sliding block are finely adjusted. A movable small bevel gear shaft is rotated according to the measured relative height reading difference and the scale on the dial gauge, so that the pointer of the dial reaches the position of the measured relative height difference and stops. Then loading is performed again at the geometric center position of the lower surface of the sliding block by using the hydraulic loader. The foregoing process is repeated, and adjustment directions of the eccentric pin shaft at different positions are opposite, gaps among the crank, the sliding block, the connecting rods and eccentric pin shaft micro-adjustment mechanisms are eliminated; and the eccentric pin shaft is fixed on one side of the second end of the connecting rod with a U-shaped notch until the nonparallelism between the lower surface of the sliding block and the upper surface of the working table meets design requirements under conditions.
Beneficial effects of the present invention are as follows:
In a large multipoint crank press, due to errors in part machining and assembling, the nonparallelism between the lower surface of the sliding block and the upper surface of the working table is greatly increased, which seriously affects the working accuracy and service life of the press and workpiece machining quality. According to the present application, the eccentric pin shaft micro-adjustment mechanism is designed between the connecting rod and the sliding block. The crank, the connecting rod and the sliding block of the multipoint press are normally machined and installed through a classical machining and installation process, so that a sliding block mechanism of the multipoint press runs to a bottom dead center. Straight lines of eccentric radii of eccentric pin shafts are each first adjusted to a horizontal position, namely a connecting line pointing to a circle center of an eccentric part from a circle center of a pin shaft positioning part, where every two of the straight lines of the eccentric radii of different positions point to opposite directions to eliminate the lateral force generated by the eccentric pin shaft on the sliding block. A gap among mechanisms is eliminated through the loading by a hydraulic loader. A center of a connecting position of one set of crank, connecting rod and sliding block mechanism is taken as a reference, and then the eccentric positions and directions of the eccentric pin shafts at different positions are finely adjusted, thus realizing high-precision assembly and operation of the multipoint press. The operation of the press and the machining precision of workpieces are improved to the greatest extent, and the structure is simple and has strong practical significance.
The accompany drawings of the specification constituting a part of the present application provide further understanding of the present application. The schematic embodiments of the present application and description thereof are intended to be illustrative of the present application and do not constitute an undue limitation of the present application.
In the figure: 1. crank, 2. side wall of a U-shaped notch at a small end of a connecting rod (corresponding to the right side in
It should be noted that the following detailed description is exemplary and aims to further describe the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the present application belongs.
It should be noted that the terms used herein are merely used for describing the specific embodiments, but are not intended to limit exemplary embodiments of the present invention. As used herein, the singular form is also intended to include the plural form unless otherwise indicated obviously from the context. Furthermore, it should be further understood that the terms “include” and/or “comprise” used in this specification specify the presence of stated features, steps, operations, elements, components and/or a combination thereof.
Noun explanation: In this embodiment, a large bevel gear and a movable small bevel gear have no specific size requirements, as long as the number of teeth of the large bevel gear is much larger than that of teeth of the movable small bevel gear.
As described in the background, in the actual production process, due to a connection gap among various parts of the press and errors left from the installation and machining process, a bottom surface of a sliding block is not in line with a working table, and a column guide rail is not exactly vertical to the working table, typically as shown in
In order to solve the problem, in the present invention, an adjusting device is mounted between a sliding block and a connecting rod of a multipoint crank press. The device is mainly comprised of a crank 1, a connecting rod 12, a sliding block 7 and an eccentric pin shaft micro-adjustment mechanism.
The eccentric pin shaft micro-adjustment mechanism includes an eccentric pin shaft 4, a fixed large bevel gear 3, a movable small bevel gear shaft 5, a dial 6 and an adjusting pointer 8; one side of the eccentric pin shaft 4 is provided with a positioning part 10, and an eccentric part 11 is disposed at the position of the eccentric pin shaft 4 close to the positioning part.
One end of the connecting rod 12 is a large end, the other end is a small end, and the small end is provided with a U-shaped notch.
The large end of the connecting rod 12 is connected to the crank 1, the small end of the connecting rod 12 is provided with the U-shaped notch, and both sides of the U-shaped notch at the small end of the connecting rod are connected to the eccentric pin shaft 4.
A side wall 2 of the U-shaped notch at the small end of the connecting rod is in detachable high-precision clearance fit connection with one side of the positioning part 10 of the eccentric pin shaft 4; and the sliding block 7 sleeves the eccentric part 11.
A side wall 9 of the U-shaped notch at the small end of the connecting rod is in high-precision clearance fit connection with a pin shaft section at the other side of the eccentric pin shaft 4, and the side wall 9 of the U-shaped notch at the small end of the connecting rod is also connected to the fixed large bevel gear 3 to fix the large bevel gear.
The fixed large bevel gear 3 sleeves the eccentric pin shaft 4 and is detachably connected to the side wall 9 of the U-shaped notch at the small end of the connecting rod; the fixed large bevel gear 3 is meshed with the movable small bevel gear shaft; the movable small bevel gear shaft 5 passes through a hole in the eccentric pin shaft 4 and is fixed by a first nut 15 and a second nut 16; and an axis of the movable small bevel gear shaft and an axis of the eccentric pin shaft perpendicularly intersect.
This embodiment takes a 4-point press as an example, and the implementation of the present application will be described in more detail below with reference to
This embodiment is explained from measurement and adjustment, where
The eccentric pin shaft micro-adjustment mechanism consists of a side wall 2 of the U-shaped notch at the small end of the connecting rod, a fixed large bevel gear 3, an eccentric pin shaft 4, a side wall 9 of the U-shaped notch at the small end of the connecting rod, a movable small bevel gear shaft 5, a dial 6 and an adjusting pointer 8.
One end of the eccentric pin shaft 4 is provided with a positioning part 10 corresponding to the right part in
A large end of the connecting rod with the small end provided with the U-shaped notch is connected to the crank 1. The side wall 2 of the U-shaped notch at the small end of the connecting rod is connected to an eccentric pin shaft section at one side of the eccentric part (corresponding to the right side in
The side wall 9 of the U-shaped notch at the small end of the connecting rod is connected to an eccentric pin shaft section at the other side of the eccentric part (corresponding to the left side in the figure).
The fixed large bevel gear 3 sleeves the eccentric pin shaft 4 and is detachably connected to the side wall 9 of the U-shaped notch at the small end of the connecting rod; and preferably, bolted connection is selected. The fixed large bevel gear 3 is meshed with the movable small bevel gear 5; a central shaft of the movable small bevel gear 5 passes through the eccentric pin shaft 4 through a hole and is fixed by a second nut 16. An axis of the movable small bevel gear 5 and an axis of the eccentric pin shaft 4 perpendicularly intersect. Positioning is carried out between the end face of the movable small bevel gear 5 and the eccentric pin shaft through a shaft sleeve sleeving the movable small bevel gear shaft.
In the central shaft of the small bevel gear, a first nut is disposed at one end of the central shaft provided with the small bevel gear to facilitate rotation of the small bevel gear; the other end of the central shaft is provided with a thread, and matched with a second nut after passing through the eccentric pin shaft 4; and the central shaft of the small bevel gear, the small bevel gear and the first nut are integrally machined.
The dial 6 is also mounted on a positioning end face of the fixed large bevel gear 3, and a spot welding mode can be used specifically; the adjusting pointer 8 is mounted on the end face of the movable small bevel gear shaft, and the adjusting pointer 8 is connected to the movable small bevel gear shaft by spot welding; and the adjusting pointer 8 is matched with the dial 6.
Aspect of measurement: according to the device for installing and adjusting a sliding block of a multipoint crank press provided by the present application, the eccentric pin shaft micro-adjustment mechanism is designed between the connecting rod and the sliding block, specifically as shown in
In a device for installing and adjusting a sliding block of a large multipoint crank press, an eccentric pin shaft 4 is designed between a connecting rod and a sliding block, an eccentric radius of the eccentric pin shaft is 0.1-1 mm, and the eccentric radii of the eccentric pin shafts on one machine should be good in consistency.
After the loading pressure of the hydraulic loader reaches 30% of the nominal pressure of the crank press, a reference position and 3 adjustment positions are found on the lower surface of the sliding block of the multipoint crank press, which are the force application center positions of each crank press for the sliding block, specifically marked in
Aspect of adjustment: based on the recorded relative height differences, the eccentric pin shaft micro-adjustment mechanisms between the corresponding connecting rod and the sliding block corresponding to the 3 adjustment positions are adjusted one by one. Since the dial 6 and the fixed large bevel gear 3 have been fixed to the connecting rod, according to the measured relative height difference and the scale on the dial, the central shaft of the movable small bevel gear is rotated with a wrench to stop its pointer at the position of the measured relative height difference, and it should be noted that the micro-adjustment directions of the eccentric pin shafts at different positions are opposite.
The foregoing process is repeated until the relative height difference meets the design requirements, and finally the eccentric pin shaft is relatively fixed to the connecting rod through a screw. The specific adjustment process is shown in
According to the present invention, the parallelism between the working bottom surface of the sliding block and the working table in the loading state of the press is ensured by a simple and efficient design, and the machining precision of the press and the service life of the die are greatly improved.
The present application has been exemplarily described with reference to the accompanying drawings above. Obviously, the specific implementation of the present application is not limited by the foregoing modes. Various immaterial improvements made by using the method concept and technical solutions of the present application or direct application of the concept and the technical solutions of the present application to other occasions without improvement shall fall within the protection scope of the present application.
Parts not involved in the present application are the same as those of the prior art or can be implemented by using the prior art.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201910753285.9 | Aug 2019 | CN | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 3592091 | Ottavan | Jul 1971 | A |
| 4677908 | Imanishi | Jul 1987 | A |
| 5321969 | Bakermans | Jun 1994 | A |
| Number | Date | Country |
|---|---|---|
| 103909672 | Jan 2013 | CN |
| 103909672 | Jul 2014 | CN |
| Entry |
|---|
| CN103909672A Gu, et alia (Jul. 9, 2014) (MT) (Year: 2014). |
| Number | Date | Country | |
|---|---|---|---|
| 20210046722 A1 | Feb 2021 | US |
