CN116556824A

CN116556824A - Impactor working mechanism and impactor

Info

Publication number: CN116556824A
Application number: CN202310834307.0A
Authority: CN
Inventors: 刘赛; 丁河江; 马建乐; 郭建飞; 周忠尚; 姜鑫; 王英赫; 李志�
Original assignee: Xuzhou XCMG Foundation Construction Machinery Co Ltd
Current assignee: Xuzhou XCMG Foundation Construction Machinery Co Ltd
Priority date: 2023-07-07
Filing date: 2023-07-07
Publication date: 2023-08-08
Anticipated expiration: 2043-07-07
Also published as: CN116556824B

Abstract

The invention discloses an impactor working mechanism and an impactor, and relates to the field of impactors, wherein the impactor working mechanism and the impactor are used for improving reversing efficiency of the impactors. The impactor working mechanism comprises a housing, a bushing, a piston, a valve sleeve assembly and a valve core. The first through hole of the shell penetrates through the axial direction of the shell; the first counter bore is arranged at intervals with the first through hole and is communicated with the first through hole through a first communication flow path. The bush is installed in the inner wall of first through-hole, and the bush includes coaxial second through-hole and the second intercommunication flow path with first through-hole. The piston is movably mounted in the second through hole along the axial direction of the housing. The valve sleeve assembly is arranged in the first counter bore of the shell; the valve sleeve assembly comprises a mounting hole and a third communication flow path; the third communication flow path communicates with the mounting hole. The valve core is movably arranged in the mounting hole; the valve core moves in the mounting hole, so that the communication states of the third communication flow path, the second communication flow path and the first communication flow path are changed, and the reciprocating motion of the piston is realized.

Description

Impactor working mechanism and impactor

Technical Field

The invention relates to the field of impactors, in particular to an impacter working mechanism and an impacter.

Background

The hydraulic impactor breaks the rock by reciprocating high frequency impact. The operation is the same for each rock strike: high-pressure oil acts on the front cavity of the piston through the reversing mechanism, the high-pressure oil pushes the piston to move to strike the drill bit shank, and huge impact energy can be generated by striking. Impact energy acts on the rock along the shank bit and the drill rod bit; meanwhile, the drill shank is rotated by a certain angle through a rotating mechanism after striking. This achieves a single impact against the rock. The piston is then reset by the reversing mechanism. The piston after reset realizes the next action of impacting the rock under the action of high-pressure oil. The above process is repeated until the rock is crashed. The impact frequency of the hydraulic impactor is determined by the reversing frequency of the reversing mechanism, so the requirement on the reversing mechanism is high. The existing reversing mechanism comprises a shell and a reversing valve, and the reversing valve is arranged on the shell. The reversing valve is communicated with the area where the piston is located through an oil way so as to realize reciprocating motion of the piston.

The inventors found that at least the following problems exist in the prior art: the impactor has very high requirements for manufacturing and installing the reversing valve, and correspondingly, the impactor has very high requirements for processing and manufacturing the shell for installing the reversing valve. In the actual use process, once the reversing valve or the shell is worn, the reversing valve or the shell is difficult to repair, and the reversing mechanism is invalid.

Disclosure of Invention

The invention provides an impactor working mechanism and an impactor, which are used for reducing the processing difficulty of a shell of the impactor.

The embodiment of the invention provides an impactor working mechanism, which comprises:

the shell comprises a first through hole, a first counter bore and a first communication flow path; the first through hole penetrates through the axial direction of the shell; the first counter bore is arranged at intervals with the first through hole and is communicated with the first communication flow path;

a bushing mounted to an inner wall of the first through hole; the bushing comprises a second through hole and a second communication flow path, and the central axes of the first through hole and the second through hole are coincident;

a piston movably installed in the second through hole along an axial direction of the housing;

the valve sleeve assembly is arranged in the first counter bore of the shell; the valve sleeve assembly includes a mounting bore and a third communication flow path; the third communication flow path communicates with the mounting hole; and

the valve core is movably arranged in the mounting hole; and through the position movement of the valve core in the mounting hole, the communication states of the third communication flow path, the second communication flow path and the first communication flow path are changed, so that different ends of the piston are filled with hydraulic oil, and the reciprocating movement of the piston relative to the shell is realized.

In some embodiments, the valve sleeve assembly further comprises:

the first plug is arranged at the bottom of the first counter bore;

the valve sleeve body is detachably arranged in the first counter bore; the valve sleeve body comprises the mounting hole and the third communication flow path, and the mounting hole and the third communication flow path are communicated; the first end of the mounting hole is closed, and the second end of the mounting hole is open; the second end of the mounting hole faces the first plug; the third communication flow path is in different conducting states through the position movement of the valve core, so that the piston reciprocates; and

and the second plug is arranged at the opening of the first counter bore and is positioned at one side of the valve sleeve body away from the first plug so as to block the first counter bore.

In some embodiments, the valve housing body is configured as a body of revolution; the valve housing body includes:

the reversing valve oil inlets are distributed along the circumferential direction of the valve sleeve body; each reversing valve oil inlet is communicated with the mounting hole;

the impact oil inlets are distributed along the circumferential direction of the valve sleeve body; each impact oil inlet is communicated with the mounting hole; and

the reversing valve oil return ports are distributed along the circumferential direction of the valve sleeve body; and each reversing valve oil return port is communicated with the mounting hole.

In some embodiments, the central axis of the oil inlet of each reversing valve forms an included angle with the central axis of the mounting hole, and the included angle is smaller than 90 degrees, so as to reduce oil inlet resistance.

In some embodiments, the central axis of each reversing valve oil return port forms an included angle with the central axis of the mounting hole, and the included angle is smaller than 90 degrees, so as to reduce oil return resistance.

In some embodiments, the first plug comprises:

the second counter bore is provided with a valve core, one end of the valve core extends into the second counter bore, and the other end of the valve core is positioned in the mounting hole; the valve core is adjustable relative to the valve sleeve body and the first plug so as to realize valve position switching of the valve core; and

a communication hole communicated with the second counter bore; the communication hole is positioned at one side of the second counter bore far away from the valve core.

In some embodiments, the valve cartridge comprises:

a first cylindrical section slidably mounted in the mounting hole;

the first transition section is integrated with or fixedly connected with the first cylindrical section, and the diameter of the first transition section is smaller than that of the first cylindrical section;

the second cylindrical section is positioned at one side of the first transition section away from the first cylindrical section; the diameter of the second cylindrical section is equal to the diameter of the first cylindrical section; the second cylindrical section is integrated with or fixedly connected with the first transition section; the area, which is positioned between the first cylindrical section and the second cylindrical section and outside the first transition section, of the valve core is a first concave part; and

the second transition section is positioned at one side of the second cylindrical section far away from the first transition section, and the second transition section and the second cylindrical section are integrated or fixedly connected; the area of the valve core outside the second transition section is a second concave part.

In some embodiments, the valve cartridge further comprises a through bore; the through hole passes through the first cylindrical section, the first transition section and the second cylindrical section; an opening of one end of the through hole is positioned at the center of the end face of the first cylindrical section; the other end opening of the through hole is positioned on the end face of the second cylindrical section and deviates from the center of the second cylindrical section.

In some embodiments, when the valve spool is in the first position, the valve spool abuts the bottom of the second counterbore of the first plug; the reversing valve oil inlet is communicated to the first transition section and is communicated with the first inner concave part, and the first inner concave part is also communicated with the impact oil inlet.

In some embodiments, when the valve spool is in the second position, the valve spool abuts the bottom of the mounting hole; the impact oil inlet is communicated with a second inner concave part outside the second transition section, and the second inner concave part is also communicated with an oil return port of the reversing valve; the through hole of the valve element is also communicated with the second concave part.

In some embodiments, the first communication flow path includes:

the first impact oil way is arranged on the inner wall of the shell and is communicated with the first through hole; and

the first reset oil way is arranged on the inner wall of the shell and is communicated with the first through hole; the first impact oil way and the first reset oil way are distributed in the axial direction of the shell;

the second communication flow path includes:

the second impact oil way is arranged on the inner wall of the bushing and is communicated with the second through hole; and

the second reset oil way is arranged on the inner wall of the bushing and is communicated with the second through hole; the second impact oil path and the second reset oil path are distributed in the axial direction of the shell.

In some embodiments, the impactor working mechanism further comprises:

and the plurality of sealing elements are distributed along the axial direction of the first counter bore, and a plurality of sealing elements are arranged between the valve sleeve assembly and the inner wall of the first counter bore.

In some embodiments, the central axis of the first counterbore, the central axis of the valve sleeve assembly, and the central axis of the valve spool are coincident.

The embodiment of the invention also provides an impactor, which comprises the impactor working mechanism provided by any technical scheme of the invention.

According to the impactor working mechanism provided by the technical scheme, the first through hole for installing the bushing is formed in the shell, the bushing comprises the second through hole for installing the piston, the shell further comprises the first counter bore for installing the valve sleeve component, the valve sleeve component comprises the installation hole, and the valve core is installed in the installation hole. Different communication states of a third communication flow path of the valve sleeve assembly are realized through position switching of the valve core; and then the second communication flow path of the bushing and the first communication flow path of the shell are in different oil inlet states, so that the piston stretches out under the action of hydraulic oil to realize impact, or resets under the state of hydraulic oil return to realize reciprocating motion of the piston. According to the technical scheme, the valve sleeve component and the valve core are directly arranged on the shell, and the oil way for realizing valve core reversing and the oil way for realizing piston reciprocating motion are extremely short, so that the valve core reversing speed is greatly improved.

In addition, generally, the machining requirements of the valve core matching surface such as tolerance level and surface finish are higher, and by adding the valve sleeve component, the machining difficulty of the inner hole of the shell is reduced, so that the machining of the inner hole of the valve sleeve component is more convenient compared with the machining of the shell. And in the maintenance process, the abrasion of the inner hole of the shell is difficult to repair, and the valve sleeve assembly can be repaired or replaced, so that the cost advantage of the valve sleeve assembly is obvious. Therefore, the valve sleeve component is matched with the valve core, so that the valve core can not directly act on the shell, the shell processing difficulty is reduced, the service life of the shell is prolonged, the maintenance cost of the shell, the valve sleeve component and the valve core in the later stage is reduced, and the stability of the reversing action of the valve core is further improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention.

Fig. 1 is a schematic structural view of an impactor working mechanism according to some embodiments of the present invention.

Fig. 2 is an enlarged partial schematic view of a valve sleeve assembly of an impactor working mechanism according to an embodiment of the invention.

Fig. 3 is a schematic structural view of a valve housing body of a valve housing assembly of a reversing mechanism of a rock machine according to an embodiment of the present invention.

Fig. 4 is a schematic structural view of a valve core of a valve sleeve assembly of a reversing mechanism of a rock machine according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of a valve core of a reversing mechanism of a rock machine in a first valve position in a partially enlarged manner.

Fig. 6 is a schematic diagram of a valve core of a reversing mechanism of a rock machine in a second valve position in a partially enlarged manner.

Fig. 7 is a schematic diagram of a valve core of a reversing mechanism of a rock machine in a middle valve position in a partially enlarged manner.

Detailed Description

The technical scheme provided by the invention is described in more detail below with reference to fig. 1 to 7.

Referring to fig. 1, an embodiment of the present invention provides an impactor working mechanism comprising a housing 1, a bushing 2, a piston 3, a valve sleeve assembly 4 and a valve spool 5. The housing 1 includes a first through hole 11, a first counterbore 12, and a first communication flow path 13. The first through hole 11 penetrates the axial direction of the housing 1; the first counterbore 12 is spaced apart from the first through hole 11 and communicates through a first communication flow path 13. The bush 2 is attached to the inner wall of the first through hole 11, and the bush 2 includes a second through hole 21 and a second communication flow path 22. The second through hole 21 is coaxial with the first through hole 11, i.e. the central axes of the two are coincident. The piston 3 is movably mounted in the second through hole 21 along the axial direction of the housing 1. The bushing 2 and the housing 1 are relatively stationary. The valve sleeve assembly 4 is mounted inside a first counterbore 12 of the housing 1. The valve housing assembly 4 includes a mounting hole 41 and a third communication flow path 42; the third communication flow path 42 communicates with the mounting hole 41. The spool 5 is movably installed in the installation hole 41. By the position movement of the valve spool 5 in the mounting hole 41, the communication state of the third communication flow path 42 and the second communication flow path 22, the first communication flow path 13 is changed so that the different end portions of the piston 3 are fed with hydraulic oil to realize the reciprocating movement of the piston 3 with respect to the housing 1. According to the technical scheme, the flow direction of the oil path is repeatedly switched through the movement of the built-in valve core 5, so that the high-speed impact operation of the piston 3 is realized.

The housing 1 comprises an integrally formed first section and second section. The outer diameter of the first section is greater than the outer diameter of the second section. The first section is provided with both a portion of the first through bore 11 and the first counterbore 12. The second section is provided with only the remaining part of the first through hole 11. The central axes of the first through hole 11 and the first counterbore 12 are parallel. The two are communicated through the first communication flow path 13.

The first communication flow path 13 includes a multi-stage oil passage and an oil chamber. Each section of oil passage and oil cavity of the first communication flow path 13 are arranged on the inner wall of the first through hole 11 of the shell 1. The structure of the piston can meet the action requirement of the piston 3.

Specifically, the first communication flow path 13 includes a first shock oil path 131 and a first return oil path 132. The front chamber 131a is one of the sections of the first impact oil passage 131. The first impact oil passage 131 is provided in the inner wall of the housing 1 and communicates with the first through hole 11. The first return oil passage 132 is provided in the inner wall of the housing 1 and also communicates with the first through hole 11. The first impact oil passage 131 and the first return oil passage 132 are arranged in a dispersed manner in the axial direction of the housing 1.

Referring to fig. 1, the central axis of the first counter bore 12, the central axis of the valve sleeve assembly 4 and the central axis of the valve core 5 are coincident, so that the stability of high-speed reversing of the valve core 5 is ensured.

The bush 2 is mounted to the inner wall of the first through hole 11, and the bush 2 is located between the housing 1 and the piston 3. The axial length of the bushing 2 is smaller than the axial length of the housing 1. The bushing 2 is provided with two signal ports: a first signal oil port 23 and a second signal oil port 24. The impact and the resetting of the piston 3 are realized through the first signal oil port 23 and the second signal oil port 24. During operation, the piston 3 is repeatedly cycled between impact and reset actions.

The bush 2 is provided with a second through hole 21 and a second communication flow path 22. The second through hole 21 and the first through hole 11 are coaxially arranged. The piston 3 is disposed inside the second through hole 21. A plurality of sealing rings 8 are arranged between the bushing 2 and the inner wall of the first through hole 11 so as to realize the sealing between the outer wall of the bushing 2 and the inner wall of the first through hole 11.

In some embodiments, the second communication flow path 22 includes a second impact oil path and a second return oil path. The second impact oil passage is provided on the inner wall of the bush 2 and communicates with the second through hole 21. The second return oil passage is provided in the inner wall of the bush 2 and communicates with the second through hole 21. The second impact oil passage and the second return oil passage are arranged in a dispersed manner in the axial direction of the casing 1.

The reversing action of the valve core 5 is realized by the combined action of the high-pressure oil and the pressure oil from the first signal oil port 23 and the second signal oil port 24.

The length of the piston 3 is greater than the length of the housing 1, and the impact end of the piston 3 is located outside the housing 1. The piston 3 is surrounded by a bushing 2, the piston 3 effecting an impact against the rock by its own reciprocating movement. Referring to fig. 1, the intermediate region of the piston 3 includes two steps: a first step 31, a second step 32. The first signal port 23 corresponds to the first step 31, and the second signal port 24 corresponds to the second step 32. The first step 31 has a movement range for blocking the first signal port 23 and exposing the first signal port 23. The second step 32 has a movement range for blocking the second signal port 24 and exposing the second signal port 24. The axial movement distance of the piston 3 relative to the housing 1 is limited, and the first step 31 does not move to the position of the second signal oil port 24, and the second step 32 does not move to the position of the first signal oil port 23.

Referring to fig. 1, 3, 5 and 6, the valve sleeve assembly 4 is integrally mounted in the first counterbore 12, and the valve spool 5 is shifted in position within the valve sleeve assembly 4 to effect valve position shifting. The position of the valve sleeve assembly 4 within the first counterbore 12 is determined along the axial direction of the first counterbore 12, and the valve sleeve assembly 4 does not move in position with the movement of the valve spool 5. In the circumferential direction of the first counterbore 12, there may be a certain amount of rotation of the valve sleeve assembly 4.

The valve housing assembly 4 includes a mounting hole 41 and a third communication flow path 42. The mounting hole 41 is used for mounting the valve core 5, the third communication flow path 42 comprises a plurality of sections of oil paths, and different oil paths of the third communication flow path 42 are conducted through the change of the position of the valve core 5 so as to realize valve position switching.

With continued reference to fig. 1-3, 5 and 6, the valve sleeve assembly 4 includes a first plug 43, a valve sleeve body 44 and a second plug 45. The first plug 43 is mounted to the bottom of the first counterbore 12. The valve housing body 44 is removably mounted within the first counterbore 12; the valve housing body 44 includes the mounting hole 41 and the third communication flow path 42, which communicate with each other. The first end of the mounting hole 41 is closed and the second end of the mounting hole 41 is open. The second end of the mounting hole 41 is directed towards the first plug 43. By the position movement of the valve core 5, the third communication flow path 42 is in different conduction states, and the reciprocating movement of the piston 3 is realized. The second plug 45 is installed at the opening of the first counterbore 12 and is located at the side of the valve sleeve body 44 away from the first plug 43 to plug the first counterbore 12.

Referring to fig. 5, the cross-sectional outer profile of the first plug 43 is generally T-shaped. The first plug 43 includes a second counterbore 431 and a communication hole 432, which communicate. The communication hole 432 is located at a side of the second counter bore 431 away from the valve element 5. The second counterbore 431 has an inner diameter dimension greater than the inner diameter dimension of the communication hole 432.

In some embodiments, the first bulkhead 43 includes a second counterbore 431 and a communication hole 432. One end of the valve core 5 extends into the second counter bore 431, and the other end of the valve core 5 is located in the mounting hole 41. The position of the valve core 5 relative to the valve sleeve body 44 and the first plug 43 can be adjusted, so that the valve position of the valve core 5 can be switched. The communication hole 432 communicates with the second counter bore 431. The housing 1 is provided with a high-pressure oil port 14 communicating with the communication hole 432. The high-pressure oil port 14 of the housing 1 communicates with the first through hole 11.

With continued reference to fig. 1-3, 5 and 6, the valve housing body 44 is configured as a solid of revolution. The reversing valve sleeve 4 takes the form of a closed end and an open end. The valve housing body 44 includes a reversing valve oil inlet 441, an impact oil inlet 442, and a reversing valve oil return 443. Along the axial direction of the valve housing body 44, the impact oil inlet 442 is located between the direction valve oil inlet 441 and the direction valve oil return 443. The valve housing body 44 is used to form a pressure groove for pushing the valve core 5 to move left and right.

As described below, the spool 5 includes a first cylindrical section 51, a first transition section 52, a second cylindrical section 53, and a second transition section 54. The second cylindrical section 53 of the valve core 5 smoothly transits with the opening of the middle cavity of the reversing valve sleeve 4, so that reversing fluctuation is reduced. The opening of the middle cavity of the reversing valve sleeve 4 refers to the area between the valve oil inlet 441 and the reversing valve oil return 443.

Referring to fig. 2, the mounting hole 41 penetrates through one end of the valve housing body 44 along the axial direction of the valve housing body 44, that is, the mounting hole 41 is a counter bore, and one end is open and one end is closed. A plurality of reversing valve oil inlets 441 are arranged along the circumferential direction of the valve housing body 44; each of the reversing valve oil inlets 441 communicates with the mounting hole 41. The respective direction valve oil inlets 441 are uniformly arranged along the circumferential direction of the valve housing body 44. The impact oil inlets 442 are arranged with a plurality of impact oil inlets 442 along the circumferential direction of the valve sleeve body 44; each of the impingement oil inlets 442 communicates with the mounting hole 41. The directional valve oil return port 443 has a plurality of directional valve oil return ports 443 arranged along the circumferential direction of the valve housing body 44. Each of the directional valve return openings 443 communicates with the mounting hole 41.

The third communication flow path 42 includes the above-described pilot valve oil inlet 441, the pilot oil inlet 442, the pilot valve oil return 443, and the below-described second counterbore 431, and the communication hole 432. The communication hole 432 is located at a side of the second counter bore 431 away from the valve element 5.

Taking the direction shown in fig. 5 or 6 as an example, the central axis of the reversing valve oil inlet 441 and the central axis of the reversing valve oil return 443 are symmetrically arranged with respect to the vertical line. The inclination direction of the central axis of the reversing valve oil inlet 441 is along the oil inlet direction, and the inclination direction of the central axis of the reversing valve oil return 443 is along the oil return direction, so that the oil inlet impact loss and the energy loss are reduced, the energy utilization rate is improved, and the valve core 5 is stable and smooth in the reversing process. The central axis of the reversing valve oil inlet 441 and the central axis of the reversing valve oil return 443 are inclined at any time, so that the effects are achieved; both are arranged in the inclined mode, so that the effect is better.

Referring to fig. 5, in some embodiments, the central axis of each reversing valve oil inlet 441 is at an angle α of less than 90 ° to the central axis of the mounting hole 41. The angle beta between the inclined direction of the reversing valve oil inlet 441 and the flow direction of the oil in the reversing valve oil inlet 441 is also smaller than 90 degrees.

With continued reference to fig. 2, 5 and 6, the valve housing body 44 is clamped outside the small diameter portion of the first plug 43, and the mounting hole 41 of the valve housing body 44 and the second counterbore 431 of the first plug 43 together form a cavity for accommodating the valve core 5. One end of the valve core 5 extends into the second counter bore 431, and the other end of the valve core 5 is located in the mounting hole 41. Wherein, the position of the valve core 5 relative to the valve sleeve body 44 and the first plug 43 is adjustable to realize the position movement of the valve core 5, so that the third communication flow path 42 is in different communication states.

Referring to fig. 4 to 6, the spool 5 includes a first cylindrical section 51, a first transition section 52, a second cylindrical section 53, and a second transition section 54. The first cylindrical section 51 is slidably mounted in the mounting bore 41. The first transition section 52 is integral with or fixedly connected to the first cylindrical section 51, the diameter of the first transition section 52 being smaller than the diameter of the first cylindrical section 51. The second cylindrical section 53 is located on the side of the first transition section 52 remote from the first cylindrical section 51; the diameter of the second cylindrical section 53 is equal to the diameter of the first cylindrical section 51; the second cylindrical section 53 is integral with or fixedly connected to the first transition section 52. The area of the valve spool 5 between the first cylindrical section 51 and the second cylindrical section 53, outside the first transition section 52, is a first concave portion 56. The second transition section 54 is located on a side of the second cylindrical section 53 remote from the first transition section 52, and the second transition section 54 is integral with or fixedly connected to the second cylindrical section 53; the area of the spool 5 outside the second transition section 54 is a second concave portion 57. The communication state of the first concave part 56 and the second concave part 57 with the reversing valve oil inlet 441, the reversing valve oil outlet and the impact oil inlet 442 of the valve sleeve body 44 is changed by the movement of the valve core 5, so that the stress state of the piston 3 is changed, and the extension and retraction of the piston 3 are realized.

Referring to fig. 4, in some embodiments, the outer wall of the first cylindrical section 51 and/or the second cylindrical section 53 is provided with an annular groove 58. Specifically, the first cylindrical section 51 and the second cylindrical section 53 may each be provided with one or more annular grooves 58, and these annular grooves 58 are arranged in parallel. During the high-speed reversing process of the valve core 5, a small amount of hydraulic oil is stored in the annular groove 58 by the valve core 5 and the valve sleeve assembly 4, so that the lubricating matching surface is realized, an extremely thin oil film is formed, and the reversing stability is improved.

With continued reference to fig. 4-5, in some embodiments, the valve cartridge 5 further includes a through bore 55. The through bore 55 passes through the first cylindrical section 51, the first transition section 52 and the second cylindrical section 53. One end opening of the through hole 55 is located at the center of the end face of the first cylindrical section 51. The other end opening of the through hole 55 is located at the end face of the second cylindrical section 53 and is offset from the center of the second cylindrical section 53. The movement of the valve body 5 is made smoother by the through hole 55.

High and low pressure chambers are formed at each chamber of the valve spool 5 and valve sleeve assembly 4. The first plug 43 of the valve sleeve assembly 4 is communicated with high-pressure oil from the front cavity 131a and pressure oil of the high-pressure oil port 14 through the second counter bore 431 and the communication hole 432, and the valve core 5 realizes reversing action under the mutual interaction of oil at two ends of the valve core.

The front cavity 131a of the piston 3 is continuously filled with pressure oil with a certain pressure value, and the rear cavity 131c of the piston 3 is opened and closed by the left-right movement of the valve core 5. When the valve core 5 is opened, high-pressure oil acts on the rear cavity 131c of the piston 3 through the communication flow path between the impact oil inlet 442 of the valve sleeve assembly 4 and the housing 1. When the valve core 5 is opened and closed, high-pressure oil to the rear cavity 131c of the piston 3 is closed, and the piston 3 moves to the rear cavity 131c under the continuous pressure oil action of the front cavity 131a of the piston 3, so that the purpose of high-speed striking is repeatedly achieved.

Referring to fig. 5, when the valve element 5 is in the first position, the valve element 5 abuts against the bottom of the second counterbore 431 of the first plug 43; the reversing valve oil inlet 441 communicates with the first transition section 52 and with the first recess 56, the first recess 56 also communicating with the impingement oil inlet 442. This valve position corresponds to the impact action of the piston 3: the oil flows from the reversing valve oil inlet 441 into the first concave portion 56, then flows into the impact oil inlet 442, and finally flows into the space where the piston 3 is located, and pushes the piston 3 to extend out, so that impact action is realized.

Referring to fig. 6, when the spool 5 is in the second valve position, the spool 5 abuts against the bottom of the mounting hole 41; the impact oil inlet 442 is communicated with a second inner concave part 57 outside the second transition section 54, and the second inner concave part 57 is also communicated with a reversing valve oil return port 443; the through hole 55 of the valve body 5 also communicates with the second concave portion 57. This valve position corresponds to the resetting action of the piston 3: the oil at the piston 3 enters the second concave part 57 through the impact oil inlet 442 and then enters the reversing valve oil return port 443, so that the retraction of the piston 3 is realized. In this state, the through hole 55 of the valve body 5 also communicates with the second concave portion 57 to discharge the oil in the space between the left end surface of the valve body 5 and the bottom surface of the mounting hole 41. The oil in the space is the residual oil along with the movement of the valve core 5 in the process of reciprocating the piston 3. Through the through hole 55, the displacement of the valve core 5 is more stable, the reversing smoothness of the valve core 5 is ensured, and the hydraulic pressure born by the valve core 5 is more balanced.

Referring to fig. 7, when the valve spool 5 is in the intermediate position, the valve spool 5 does not rest against the bottom of the mounting hole 41 nor against the bottom of the second counterbore 431 of the first plug 43. D1, d2 in fig. 7 contrast the solution according to an embodiment of the invention, the first recess 56 being smaller in size.

Taking the position of the valve core 5 as the description center, the single cycle process is as follows: in the middle position, the second cylindrical section 53 of the valve core 5 completely blocks the impact oil inlet 442, the impact oil inlet 442 is closed, and the piston 3 does not move. Then, the oil inlet pressure acts on the first concave portion 56 of the valve core 5, i.e., the left cavity in fig. 2, to push the valve core 5 to move rightward, the impact oil inlet 442 is opened, and the high-pressure oil acts on the rear cavity 131c of the piston 3 through the flow paths of the impact oil inlet 442, the first communication flow path 13, etc., to push the piston to move forward, i.e., to move rightward in the direction shown in fig. 1. After the piston 3 moves to the striking position, the second step 32 of the piston 3 passes through the second signal oil port 24, the pressure oil in the front cavity 131a and the rear cavity 131c of the piston 3 changes, and the high-pressure oil acts on the second concave part 57 of the valve core 5 through the reserved oil duct, namely the right end surface of the valve core 5 in fig. 2, so as to push the valve core 5 to move left, and simultaneously, the piston 3 realizes rollback and returns to the starting position.

In operation, the above-mentioned impact process is continuously circulated, realizing high-speed movement of the piston 3.

In the center of the description regarding the action of the piston 3, the operation of the entire impactor working mechanism is as follows.

The left cavity of the valve core 5 (the cavity formed by the first concave part 56 and the inner wall of the valve sleeve assembly 4) is connected with high-pressure oil, and the right cavity of the valve core 5 is switched by the movement of the piston 3. The front chamber 131a of the piston 3 is at normal pressure, and the middle chamber 131b of the piston 3 and the rear chamber 131c of the piston 3 are switched between a high pressure state and a low pressure state.

The high-pressure oil introduced from the reversing valve oil inlet 441 acts on the left cavity of the valve core 5, pushes the valve core 5 to move right to open the impact oil inlet 442, and the third communication flow path 42 of the pressure oil entering the valve sleeve assembly 4 acts on the rear cavity 131c of the piston 3 shown in fig. 1, so that the piston 3 is pushed to move forward, and the impact action of the piston 3 is realized.

When the second step 32 of the piston 3 passes through the second signal oil port 24, the pressure oil of the front cavity 131a acts on the right end of the valve core 5 through the second signal oil port 24 and the internal pore canal, and pushes the valve core 5 to move left to close the impact oil inlet 442, so that the pressure of the rear cavity 131c of the piston 3 is reduced, and the piston 3 is decelerated and is retracted.

After the impact operation, that is, after the piston 3 has been struck, the high-pressure oil in the front chamber 131a of the piston 3 acts on the right end surface of the valve element 5 through the first communication passage 13 of the housing 1, the second communication passage hole 22 of the bush 2, and the second signal oil port 24, and pushes the valve element 5 to move leftward. At the same time, the right cavity of the valve core 5 is communicated with an oil return path, and is communicated with the left end face of the valve core 5 through a through hole 55 of the valve core 5, so that a sealing chamber is formed with the valve sleeve assembly 4. The oil return pressure always acts on the left end face of the valve core 5 and the through hole 55; the high-pressure oil acts on the right end surface of the valve core 5, and the pressure difference is formed between the through hole 55 of the valve core 5 and the right end surface, so that the valve core 5 moves leftwards, and the impact oil inlet 442 is closed. And then the pressure of the rear cavity 131c of the piston 3 is reduced, and the retraction of the piston 3 is realized under the normal pressure of the front cavity 131a of the piston 3.

In the piston retreating process, the second signal oil port 24 is closed, and a high-pressure oil path leading to the valve core 5 is closed; in the process of continuing to retract the piston 3, the first signal oil port 23 is opened, and the process is repeated, so that the piston 3 moves axially at a high speed.

During the retraction of the piston 3, the second signal port 24 is closed to shut off the passage between the front chamber 131a and the valve element 5, and the pressure oil acting on the right end of the valve element 5 is reduced. The high pressure oil path to the valve spool 5 is closed. The piston 3 continues to retreat, the first signal oil port 23 is opened, the middle cavity 131b of the piston 3 is communicated with the low-pressure energy accumulator 9, and then is communicated with the right cavity of the valve core 5, the high-pressure energy accumulator 10 and the oil inlet oil way jointly act on the left cavity of the valve core 5, and the valve core 5 is pushed to move right again. The first signal port 23 is connected to the return oil passage through the second communication flow path 22 of the liner 2 and the first communication flow path 13 of the casing 1, and relieves pressure of the pressure oil. The pressure at the right end of the valve core 5 is reduced, the valve core 5 starts the next impact stroke under the action of the oil inlet pressure of the left cavity, and high-speed reversing and impact are repeatedly realized in this way.

Referring to fig. 1, in some embodiments, the impactor working mechanism further comprises a plurality of seals 6, and a plurality of seals 6 are mounted between the valve sleeve assembly 4 and the inner wall of the first counterbore 12 along the axial direction of the first counterbore 12. The seal 6 is, for example, a seal ring or the like. The sealing element 6 is used for sealing the valve sleeve assembly 4 and the inner wall of the first counter bore 12 of the shell 1, so that oil leakage is prevented; on the other hand, the machining difficulty of the valve sleeve assembly 4 and the inner wall of the first counter bore 12 is reduced, so that the matching requirement of the valve sleeve assembly and the first counter bore 12 is reduced.

In some embodiments, the impactor working mechanism further comprises a bushing limiting mechanism 7, the bushing limiting mechanism 7 being mounted to an inner wall of the first through hole 11 to limit the extreme position of the bushing 2. The bushing limiting mechanism 7 is, for example, a boss or a seat body of a sealing ring, and the movement range of the bushing 2 is limited by the bushing limiting mechanism 7 to prevent the bushing 2 from being separated from the first through hole 11.

According to the technical scheme, the valve sleeve assembly 4 and the valve core 5 jointly form a reversing mechanism, and the piston 3 serves as an impact mechanism. The reversing mechanism and the impact mechanism form a whole. The valve core 5 is not controlled to change direction by a controller alone, and in order to achieve a high-speed change direction structure matched with an impact mechanism, the valve core 5 is pushed to change direction by the back kinetic energy of a piston. The reversing frequency of the valve core 5 is determined by the control of the piston stroke to the signal oil, the impact frequency is controlled by the reversing frequency of the valve core 5, and the two are mutually influenced to form a stable structure, so that the coordination and consistency of the working mechanism of the impactor are higher.

In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the protection of the present invention.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with others, which may not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An impactor working mechanism, comprising:

a housing (1) including a first through hole (11), a first counterbore (12), and a first communication flow path (13); the first through hole (11) penetrates through the axial direction of the shell (1); the first counter bore (12) is arranged at intervals with the first through hole (11) and is communicated with the first communication flow path (13);

a bushing (2) mounted on the inner wall of the first through hole (11); the bushing (2) comprises a second through hole (21) and a second communication flow path (22), wherein the central axes of the first through hole (11) and the second through hole (21) are coincident;

a piston (3) movably mounted in the second through hole (21) along an axial direction of the housing (1);

the valve sleeve assembly (4) is arranged in the first counter bore (12) of the shell (1); the valve sleeve assembly (4) comprises a mounting hole (41) and a third communication flow path (42); the third communication flow path (42) communicates with the mounting hole (41); and

a valve element (5) movably mounted in the mounting hole (41); by means of the position movement of the valve core (5) in the mounting hole (41), the communication states of the third communication flow path (42), the second communication flow path (22) and the first communication flow path (13) are changed, so that different ends of the piston (3) are communicated with hydraulic oil, and the reciprocating movement of the piston (3) relative to the shell (1) is realized.

2. The impactor working mechanism according to claim 1, wherein the valve sleeve assembly (4) further comprises:

a first plug (43) mounted to the bottom of the first counterbore (12);

a valve housing body (44) removably mounted within the first counterbore (12); the valve housing body (44) includes the mounting hole (41) and the third communication flow path (42), which are communicated with each other; the first end of the mounting hole (41) is closed, and the second end of the mounting hole (41) is open; -the second end of the mounting hole (41) is directed towards the first plug (43); the third communication flow path (42) is in different conducting states through the position movement of the valve core (5), so that the reciprocating movement of the piston (3) is realized; and

the second plug (45) is arranged at the opening of the first counter bore (12) and is positioned at one side of the valve sleeve body (44) away from the first plug (43) so as to plug the first counter bore (12).

3. The impactor working mechanism according to claim 2, wherein the valve housing body (44) is configured as a rotator; the valve housing body (44) includes:

a reversing valve oil inlet (441) which is formed by arranging a plurality of reversing valve oil inlets (441) along the circumferential direction of the valve sleeve body (44); each reversing valve oil inlet (441) is communicated with the mounting hole (41);

an impact oil inlet (442), a plurality of impact oil inlets (442) being arranged along the circumferential direction of the valve sleeve body (44); each impact oil inlet (442) is communicated with the mounting hole (41); and

a reversing valve oil return port (443) in which a plurality of reversing valve oil return ports (443) are arranged along the circumferential direction of the valve housing body (44); each reversing valve oil return port (443) is communicated with the mounting hole (41).

4. A striker operating mechanism as claimed in claim 3, wherein the central axis of each of said reversing valve oil inlets (441) is at an angle to the central axis of said mounting hole (41) of less than 90 ° to reduce oil feed resistance.

5. A striker operating mechanism according to claim 3, wherein the central axis of each reversing valve return opening (443) is at an angle to the central axis of the mounting hole (41) of less than 90 ° to reduce return resistance.

6. A striker working mechanism according to claim 3, wherein said first plug (43) comprises:

a second counter bore (431), one end of the valve core (5) extends into the second counter bore (431), and the other end of the valve core (5) is positioned in the mounting hole (41); the position of the valve core (5) relative to the valve sleeve body (44) and the first plug (43) can be adjusted so as to realize valve position switching of the valve core (5); and

a communication hole (432) communicating with the second counterbore (431); the communication hole (432) is positioned at one side of the second counter bore (431) away from the valve core (5).

7. A striker operating mechanism according to claim 3, wherein the valve spool (5) comprises:

a first cylindrical section (51) slidably mounted in the mounting hole (41);

a first transition section (52) integral with or fixedly connected to the first cylindrical section (51), the diameter of the first transition section (52) being smaller than the diameter of the first cylindrical section (51);

-a second cylindrical section (53) located at a side of the first transition section (52) remote from the first cylindrical section (51); the diameter of the second cylindrical section (53) is equal to the diameter of the first cylindrical section (51); the second cylindrical section (53) is integral with or fixedly connected to the first transition section (52); the valve core (5) is positioned between the first cylindrical section (51) and the second cylindrical section (53), and the area outside the first transition section (52) is a first concave part (56); and

a second transition section (54) located on a side of the second cylindrical section (53) remote from the first transition section (52), the second transition section (54) being integral with or fixedly connected to the second cylindrical section (53); the area of the valve core (5) outside the second transition section (54) is a second concave part (57).

8. The impactor working mechanism according to claim 7, wherein the valve cartridge (5) further comprises a through hole (55); the through-hole (55) passes through the first cylindrical section (51), the first transition section (52) and the second cylindrical section (53); an opening at one end of the through hole (55) is positioned at the center of the end face of the first cylindrical section (51); the other end opening of the through hole (55) is positioned at the end face of the second cylindrical section (53) and is deviated from the center of the second cylindrical section (53).

9. The impactor working mechanism according to claim 7, wherein when the valve spool (5) is in a first valve position, the valve spool (5) abuts against a bottom of a second counterbore (431) of the first plug (43); the reversing valve oil inlet (441) is communicated to the first transition section (52) and is communicated with the first inner concave portion (56), and the first inner concave portion (56) is also communicated with the impact oil inlet (442).

10. The impactor working mechanism according to claim 7, wherein when the valve spool (5) is in the second valve position, the valve spool (5) abuts against the bottom of the mounting hole (41); the impact oil inlet (442) is communicated with a second inner concave part (57) outside the second transition section (54), and the second inner concave part (57) is also communicated with an oil return port (443) of the reversing valve; a through hole (55) of the valve body (5) is also in communication with the second recess (57).

11. The impactor working mechanism according to claim 1, wherein,

the first communication channel (13) includes:

a first impact oil path (131) which is provided on the inner wall of the housing (1) and communicates with the first through hole (11); and

a first return oil passage (132) which is provided on the inner wall of the housing (1) and communicates with the first through hole (11); the first impact oil path (131) and the first reset oil path (132) are distributed in the axial direction of the shell (1);

the second communication flow path (22) includes:

the second impact oil way is arranged on the inner wall of the bushing (2) and is communicated with the second through hole (21); and

the second reset oil way is arranged on the inner wall of the bushing (2) and is communicated with the second through hole (21); the second impact oil path and the second reset oil path are distributed in the axial direction of the shell (1).

12. The impactor working mechanism according to claim 1, further comprising:

a plurality of seals (6) distributed along the axial direction of the first counterbore (12); a plurality of seals (6) are mounted between the valve sleeve assembly (4) and the inner wall of the first counterbore (12).

13. The impactor working mechanism according to claim 1, wherein the central axis of the first counterbore (12), the central axis of the valve sleeve assembly (4) and the central axis of the valve core (5) coincide.

14. An impactor comprising an impactor working mechanism according to any one of claims 1 to 13.