Patent Application
20240293824
The present invention relates to a hydraulic breaker, and more specifically, to a hydraulic breaker without a back head and having a cylinder block with a polyhedral assembly structure.
Generally, a hydraulic breaker is attached to construction machinery such as excavators and used for crushing, compaction, and pile driving.
In
A driving method of a general hydraulic breaker is that a flow path is changed by a switch valve 800 when the impact piston 600 receives fluid from the outside and moves forward, and the impact piston 600 rapidly moves backward and obtains impact force due to a gas pressure charged in the back head 500.
The impact piston is formed of a lower portion, a middle portion, and an upper portion, and a stroke distance should be long to gain effective impact force. That is, the lower portion, the middle portion, and the upper portion should each be lengthened. For example, to increase the stroke distance by 200 mm, the lengths of the lower portion, the middle portion, and the upper portion should each be increased by 200 mm. Also, when an upper bush and a lower bush are included, a length of the impact piston is much greater, so the stroke distance cannot be easily increased.
In addition, as the stroke distance of the impact piston increases, lengths of the cylinder block and the back head also increase, increasing the size and weight of the overall structure. Therefore, there are many problems when operating construction machinery, such as increased fuel efficiency and product production costs, as well as inconvenience in handling.
Accordingly, Korean Patent No. 10-0820644 discloses “a back head structure of a hydraulic breaker” to increase a charging pressure by increasing the capacity of nitrogen gas charged inside by increasing the size of the back head.
Even in this breaker, the size of the overall structure eventually increases, causing the problems described above.
The present invention is directed to providing a hydraulic breaker without a back head and having a cylinder block with a polyhedral assembly structure that not only reduces the overall structure, but also an impact piston type is designed as an impact ram type without a piston part, thereby achieving a longer stroke distance and increased impact force, and the length of the impact ram is shortened, leading to cost reduction. Moreover, costs are reduced by using a seal in only one part of an impact ram cylinder.
In addition, the present invention replaces the role of the conventional back head by sealing an assembly surface of a plate assembled into a polyhedron and applying a seal retainer to a ram cylinder to fill a sealed space with compressed gas.
A block guide is installed to prevent each module containing a linear bearing block, a hinge block, a push rod and a valve pressing adjustment rod from breaking away when each module moves forward and backward. To guide the impact ram and a ram block module in a straight line, a plurality of linear bearing blocks and linear bearing guides are installed so that the impact ram and the ram block module reciprocate stably.
In addition, the present invention provides a hydraulic breaker without a back head and having a cylinder block made into a polyhedron that is able to be disassembled and assembled, making it easy to replace internal consumables, so that the best performance may be maintained even for long-term use by replacing consumables in a timely manner.
One aspect of the present invention provides a hydraulic breaker without a back head including: a plate on which a plurality of tabs, bolt holes, gas inlets, and oil inlets are machined, and a pilot passage hole connecting a main control valve and a pilot valve is perforated therein; the main control valve that receives fluid from an outside of a polyhedron; the pilot valve that controls the main control valve in a sealed space inside the polyhedron; an impact ram integrally coupled with a ram block module; a ram cylinder in which the impact ram reciprocates; each double-acting cylinder operated by the main control valve; each module integrally coupled with a piston rod within each double-acting cylinder; a block guide that prevents each module from breaking away when moving forward and backward; the impact ram and the ram block module that are moved forward by each module; a linear bearing guide that guides each module and the impact ram and the ram block module in a straight line; and a charged compressed gas that moves the impact ram and the ram block module, which are moved forward, backward to have an impact.
A block guide is further included to prevent each module from being separated.
An assembly surface of a plate assembled into a polyhedral is sealed, and a seal retainer is applied to the ram cylinder to fill a sealed space with the compressed gas.
Each module includes a linear bearing block, a hinge block, a push rod, and a valve pressing adjustment rod.
Each double-acting cylinder includes a module coupled to the piston rod.
The hinge block includes a locking portion that comes into contact with a protruding portion of the ram block module.
Two spools in the pilot valve are alternately operated by a seesaw plate whenever two valve pressing adjustment rods press the spools protruding from the left and right based on a seesaw plate axis.
A limit roller is further included to separate the hinge block from the ram block module.
The hydraulic breaker without the back head according to the present invention not only reduces manufacturing costs by manufacturing the cylinder block in a polyhedral shape, which reduces the overall structure, but also allows for easy disassembly and assembly, so the best hydraulic breaker performance can always be maintained by replacing consumables in a timely manner.
By applying a seal retainer to a ram cylinder, which has an assembly structure of a polyhedron, a sealed space is filled with compressed gas to fulfill the function of the excluded back head.
In addition, by changing a structure of an impact piston to an impact ram type without a piston part, a stroke distance is increased and the impact force of a hydraulic breaker is improved, which improves work efficiency and reduces fuel efficiency. Also, by applying a linear bearing block and a linear bearing guide, the length of the impact ram can be significantly reduced, and a seal retainer can be used in only one place on a ram cylinder, reducing manufacturing and management costs.
Hereinafter, a preferred embodiment of a hydraulic breaker without a back head according to the present invention will be described in detail with reference to the attached drawings. For reference, in describing the present invention below, terms referring to the components of the present invention are named in consideration of the function of each component, and should not be understood as limiting the technical components of the present invention.
Referring to
The hydraulic breaker without the back head includes a plate 100 on which a plurality of fastening tabs 7, bolt holes (not shown), gas inlets, oil inlets, oil outlets (not shown), etc. are processed and an assembly surface of the plate 100 assembled into a polyhedron is sealed and a seal retainer 80 is applied to a ram cylinder 50 to make a sealed space and fill the sealed space with gas.
The filled gas pressure functions to obtain impact force by rapidly moving the advanced impact ram 40 and ram block module 60 backward.
In addition, a plurality of pilot flow holes 6 connecting a main control valve 70 and a pilot valve 71 are perforated in the plate 100 assembled into the polyhedron.
The main control valve 70 receives fluid from the outside and supplies the fluid to the inside of the plate 100 through the pilot flow holes 6, and the interior space of the plate 100 accommodates the pilot valve 71, which controls the main control valve 70 and double-acting cylinders 20 and 21.
Referring to
That is, when the integrated first piston rod 10 and first module 30 move forward, the impact ram 40 and the ram block module 60 move forward together. If the advanced impact ram 40 and the ram block module 60 move backward, the integrated second piston rod 11 and second module 31, which are on standby, move forward and move the integrated impact ram 40 and the ram block module 60 forward.
To explain in more detail, referring to
By the main control valve 70, the first module 30 moves forward together with the first piston rod 10, and the second module 31 moves backward together with the second piston rod 11. When moving backward, the hinge block 1 in the second module 31 is in close contact with a limit rod 3 and stands upright, and the interference with the impact ram 40 and the ram block module 60 is eliminated.
In
Each hinge block 1 stands upright in close contact with each limit rod 3 (one of them is not shown).
In addition, the two spools 72 in the pilot valve 71 are based on a seesaw principle and are alternately operated by a seesaw plate 72b whenever the two valve pressing adjustment rods 5 press the spools from the left and right based on a seesaw plate axis 72a.
As described above, the technical ideas described in the embodiments of the present invention can be implemented independently or in combination with each other. In addition, the present invention is described through embodiments described in the drawings and detailed description of the invention, but these are merely illustrative, and various modifications and other equivalent embodiments can be made by those skilled in the art. Therefore, the technical protection scope of the present invention should be determined by the attached patent claims.
The present invention relates to a hydraulic breaker and more specifically, a hydraulic breaker without a back head and having a cylinder block with a polyhedral assembly structure.
The hydraulic breaker without the back head according to the present invention not only reduces manufacturing costs by manufacturing the cylinder block in a polyhedral shape, which reduces the overall structure, but also allows for easy disassembly and assembly, so the best hydraulic breaker performance can always be maintained by replacing consumables in a timely manner.
By applying a seal retainer to a ram cylinder, which has an assembly structure of a polyhedron, a sealed space is filled with compressed gas to fulfill the function of the excluded back head.
In addition, by changing a structure of an impact piston to an impact ram type without a piston part, a stroke distance is increased and the impact force of a hydraulic breaker is improved, which improves work efficiency and reduces fuel efficiency. Also, by applying a linear bearing block and a linear bearing guide, the length of the impact ram can be significantly reduced, and a seal retainer can be used in only one place on a ram cylinder, reducing manufacturing and management costs.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2021-0087005 | Jul 2021 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2022/009091 | 6/27/2022 | WO |
