Hydraulic breaking hammer power assembly

Abstract

The utility model relates to hydraulic breaking hammer technical field especially hydraulic breaking hammer power assembly, include: drill rod seat for installing cylinder and drill rod, this drill rod seat is used for sliding installation drill rod, the piston is slidably installed in this cylinder, reversing valve, this reversing valve is installed on the cylinder and is equipped with the hydraulic oil circuit for the hydraulic oil flow circulation between it and the piston cavity in the cylinder, this reversing valve passes through reversing control hydraulic oil and enters the different cavity of piston for realizing piston reciprocating motion along the cylinder, energy accumulator, its installation is on reversing valve and is connected with the hydraulic oil circuit of reversing valve, is used for the hydraulic energy storage when piston is going up and the release hydraulic energy when piston is going down to increase the impact force when piston is going down, is used for solving the technical problem that the piston buffer of the breaking hammer in the prior art exists in the general existence of internal leakage and is hurt and the slow and long stroke of the frequency of attack.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic breaker technology, and in particular to a hydraulic breaker power assembly. Background Technology

[0002] The descriptions in this section are provided only as background information relating to this disclosure and do not constitute prior art.

[0003] A hydraulic breaker is an engineering machinery accessory that utilizes hydraulic energy to convert into mechanical impact energy for operations such as breaking, demolition, and excavation. It is widely used in mining, building demolition, road construction, metallurgy, and municipal engineering. The working principle of a hydraulic breaker is essentially the process of converting hydraulic energy into high-frequency mechanical impact energy. Its core lies in the reciprocating motion of the piston and the energy amplification and buffering effect of the nitrogen accumulator.

[0004] Existing technology discloses a hydraulic hammer that can operate without clamping the chisel. Patent CN113700074B discloses an invention patent that describes a pneumatic valve between the buffer chamber and the high-pressure oil in the system. When the piston enters the buffer chamber, the pneumatic valve opens, allowing high-pressure oil to enter and push the piston out, thus enabling the hydraulic hammer to operate. When the piston leaves the buffer chamber, the pneumatic valve closes, cutting off the oil circuit. However, related technologies, including the aforementioned solution, still have many problems. For example, traditional hydraulic breakers have a nitrogen chamber above the piston, and the impact chisel is driven by the energy released after nitrogen compression. However, the buffer position in traditional breakers is generally located in the small diameter of the piston's rear chamber, which easily causes internal leakage of oil in the piston buffer chamber, leading to piston displacement, scoring, and oil leakage. Furthermore, traditional breakers generally have long strokes and large piston action chamber cross-sections, resulting in slow frequency and low impact force. Utility Model Content

[0005] The purpose of this utility model is to provide a hydraulic breaker power assembly to solve the technical problems of internal leakage and scoring during piston buffering, slow striking frequency, and long stroke that are common in existing hydraulic breakers.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A hydraulic breaker power assembly, comprising:

[0008] A drill rod holder is used to mount a cylinder body and a drill rod. The drill rod holder is used to slide the drill rod, and the piston is slidably mounted inside the cylinder body.

[0009] A reversing valve is mounted on the cylinder body and has a hydraulic oil passage between it and the piston chamber inside the cylinder body for supplying hydraulic oil. The reversing valve controls the hydraulic oil to enter different chambers of the piston by reversing to realize the reciprocating motion of the piston along the cylinder body.

[0010] An accumulator, which is installed on the directional valve and connected to the hydraulic circuit of the directional valve, is used to store hydraulic energy when the piston moves upward and to release hydraulic energy when the piston moves downward to increase the impact force when the piston moves downward.

[0011] Furthermore, the cylinder body is radially provided with piston chamber a, piston chamber b, piston chamber c, and piston chamber d. Piston chamber c and piston chamber d are both located between piston chamber a and piston chamber b. Piston chamber a is connected to the first output oil circuit of the reversing valve through a first input oil circuit. Piston chamber b is connected to the second output oil circuit of the reversing valve through a second input oil circuit. Piston chamber c is located between piston chamber d and piston chamber b. When the first output oil circuit of the reversing valve is energized, the hydraulic oil in piston chamber a pushes the piston upward. When the second output oil circuit of the reversing valve is energized, the hydraulic oil in piston chamber b pushes the piston downward.

[0012] Furthermore, the piston is provided with a radially concave first annular groove, a second annular groove, and a radially convex third annular platform. The axial width of the first annular groove is greater than the distance between piston chamber c and piston chamber d. The upper end face depth of the second annular groove is greater than the lower end face depth so that the piston can be pushed upward when the second annular groove is filled with oil. The upper surface diameter of the third annular platform is greater than the lower surface diameter so that the piston can be pushed downward when piston chamber b is filled with oil.

[0013] Furthermore, the piston chamber b is located at the top of the cylinder body, and a buffer groove is provided at the bottom of the piston chamber b, which is slidably installed with the third ring platform of the piston.

[0014] Furthermore, the directional valve includes a valve seat, a valve sleeve, and a valve core:

[0015] The valve seat is provided with an oil inlet and an oil outlet, as well as a main oil chamber connected to the oil inlet, and the valve seat is provided with a first output oil passage or a second output oil passage connected to the main oil chamber.

[0016] The valve seat is also provided with a connecting cavity for connecting the accumulator. One end of the connecting cavity is connected to the accumulator, and the other end is connected to the main oil chamber.

[0017] The valve sleeve is fixedly installed inside the valve seat, and the valve core is slidably installed inside the valve sleeve. When the valve core slides, it realizes the switching of two oil circuits. One oil circuit is an oil inlet connected to the main oil chamber, and the main oil chamber is connected to the accumulator and the first output oil circuit respectively. The other oil circuit is an oil inlet connected to the main oil chamber, and the main oil chamber is connected to the accumulator and the second output oil circuit respectively.

[0018] Furthermore, the outer circumferential surface of the valve sleeve is provided with several annular grooves, and its inner cavity wall is provided with several annular grooves that correspond one-to-one. The annular grooves that correspond to each other are connected to form an annular cavity. The annular cavity includes a first annular cavity, a second annular cavity, a third annular cavity, a fourth annular cavity, and a fifth annular cavity. The third annular cavity is connected to the main oil cavity, the first annular cavity is connected to the feedback oil circuit, and the feedback oil circuit is connected to the bottom end face of the valve seat.

[0019] Furthermore, the outer peripheral wall of the valve core is provided with three annular grooves, namely a first annular groove, a second annular groove, and a third annular groove. A first sealing cavity is provided at the left end of the valve core, and a second sealing cavity with a cross-sectional area smaller than that of the first sealing cavity is provided at the right end. A left positioning pin for sealing the first sealing cavity is slidably installed at the left end of the valve core, and a right positioning pin for sealing the second sealing cavity is slidably installed at the right end of the valve core. Both the first and second sealing cavities are provided with through holes along the radial direction, wherein the through hole of the second sealing cavity communicates with the second annular groove. When the valve core is located at the left end limit position, the first annular groove communicates with the second annular cavity, the second annular groove communicates with the third annular cavity, the third annular groove communicates with the fourth and fifth annular cavities simultaneously, and the first sealing cavity communicates with the first annular cavity. When the valve core is located at the right end limit position, the first annular groove communicates with the second and third annular cavities simultaneously, the second annular groove communicates with the third and fourth annular cavities simultaneously, the third annular groove communicates with the fifth annular cavity, and the through hole of the first sealing cavity communicates with the first annular groove.

[0020] Furthermore, a front flange cover and a rear flange cover are also installed on the valve seat, wherein the front flange cover and the rear flange cover are respectively tightened to the two end faces of the valve sleeve, and the left locating pin and the right locating pin respectively abut against the rear flange cover and the front flange cover at the ends away from the valve core.

[0021] Furthermore, a left valve cover and a right valve cover are also installed on the valve seat. A one-way valve is installed on the left valve cover. The one-way valve is installed in series between the oil inlet and the main oil inlet circuit. The main oil inlet circuit is connected to the main oil chamber. An overflow valve is installed between the right valve cover and the valve seat. The overflow valve is connected in parallel with the return oil circuit and then connected to the oil outlet. The inlet of the overflow valve is connected to the first output oil circuit through the pilot oil circuit. The return oil circuit includes a horizontal section and a vertical section connected to it. The horizontal section of the return oil circuit is also connected to the left end chamber and the right end chamber. The left end chamber is a cavity formed by the valve seat, the rear flange cover, the left end face of the valve sleeve, and the left positioning pin. The right end chamber is a cavity formed by the valve seat, the front flange cover, the right end face of the valve sleeve, and the right positioning pin.

[0022] Furthermore, the piston chamber d is connected to the feedback oil passage through an oil passage located within the cylinder body, and the piston chamber c is connected to the vertical section of the return oil passage through an oil passage located within the cylinder body.

[0023] Furthermore, an obstacle block is installed between the reversing valve and the cylinder body. An obstacle cavity is provided inside the obstacle block. The top of the piston passes through the bottom of the obstacle block and is located inside the obstacle block. The top of the piston is slidably installed in a sealed manner with the obstacle block.

[0024] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0025] (1). This utility model eliminates the nitrogen chamber used in traditional hydraulic hammers and instead uses an accumulator and hydraulic oil to drive the piston downward to drive the chisel to complete the striking operation. At the same time, combined with the setting of the piston buffer groove, it avoids the piston displacement and scoring oil leakage caused by the internal leakage of oil in the piston buffer chamber that is easy to occur in traditional structures, thus extending the service life of the hydraulic hammer and reducing the failure rate.

[0026] (2). By setting up a piston chamber between the piston and the cylinder, as well as structures such as ring platforms and ring grooves, this utility model greatly reduces the cross-sectional area of ​​the piston working chamber, thereby increasing the impact force of the piston downward. At the same time, combined with the structure of the reversing valve, it shortens the piston stroke and increases the impact frequency. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 This is a schematic diagram of the main structure of this utility model;

[0029] Figure 3 This is a top view of the structure of this utility model;

[0030] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at point AA;

[0031] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure at point BB;

[0032] Figure 6 for Figure 3 Schematic diagram of the cross-sectional structure at the CC section;

[0033] Figure 7 for Figure 3 Schematic diagram of the cross-sectional structure at point DD;

[0034] Figure 8 for Figure 3 Schematic diagram of the cross-sectional structure at the middle EE section;

[0035] Figure 9 for Figure 4 Schematic diagram of the cross-sectional structure at the middle FF section;

[0036] Figure 10 for Figure 4 Schematic diagram of the cross-sectional structure at the middle GG point;

[0037] Figure 11 for Figure 2 Schematic diagram of the cross-sectional structure at point KK;

[0038] Figure 12 for Figure 2 Schematic diagram of the cross-sectional structure at the middle HH section;

[0039] Figure 13 This is a schematic diagram of the piston position during the return energy storage phase.

[0040] Figure 14 This is a schematic diagram of the piston position during the reversing triggering phase.

[0041] Figure 15 This is a schematic diagram of the piston position during the impact phase of the stroke.

[0042] Figure 16 for Figure 4 A magnified schematic diagram of the structure at point M in the middle;

[0043] Figure 17 This is a three-dimensional structural diagram of the valve sleeve;

[0044] Figure 18 This is a schematic diagram of the three-dimensional structure of the valve core;

[0045] Figure 19 A three-dimensional structural diagram of the overflow valve core;

[0046] Figure 20 A three-dimensional structural diagram of the overflow valve sleeve;

[0047] Figure 21 for Figure 20 Schematic diagram of the cross-sectional structure at point NN;

[0048] Figure 22 This is a schematic diagram of the cross-sectional structure of the valve core at the leftmost limit position;

[0049] Figure 23 for Figure 13 A magnified schematic diagram of the local structure at point P.

[0050] In the diagram: 100, valve seat; 101, inlet flange; 102, outlet flange; 103, right valve cover; 1031, relief valve; 10311, relief valve sleeve; 103111, fourth annular groove; 103112, fifth annular groove; 103113, sixth annular cavity; 103114, seventh annular cavity; 103115, eighth annular cavity; 10312, relief valve core; 103121, relief annular groove; 103122, annular end face; 10313, Overflow elastic element; 104, Front flange cover; 105, Left valve cover; 1051, Check valve; 106, Rear flange cover; 107, Connecting cavity; 108, Main oil cavity; 109, First output oil circuit; 110, Second output oil circuit; 111, Main oil inlet circuit; 112, Feedback oil circuit; 113, Horizontal section of return oil circuit; 114, Pilot oil circuit; 115, Vertical section of return oil circuit; 116, Left end cavity; 117, Right end cavity; 118, Return oil passage;

[0051] 200. Valve sleeve; 201. First annular cavity; 202. Second annular cavity; 203. Third annular cavity; 204. Fourth annular cavity; 205. Fifth annular cavity;

[0052] 300, Valve core; 301, First annular groove; 302, Second annular groove; 303, Third annular groove; 304, First sealing cavity; 305, Second sealing cavity;

[0053] 400, Left locating pin;

[0054] 500, right locating pin;

[0055] 600. Accumulator;

[0056] 700, clearance block; 701, clearance cavity;

[0057] 800. Cylinder block; 801. Piston; 8011. First annular groove; 8012. Second annular groove; 8013. Third annular platform; 802. Piston chamber b; 803. Piston chamber c; 804. Piston chamber d; 805. Piston chamber a; 806. First input oil passage; 807. Second input oil passage; 808. Buffer groove;

[0058] 900, drill rod holder; 901, thrust ring. Detailed Implementation

[0059] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0060] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0061] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0062] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0063] In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0064] Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0065] To address the limitations of existing technologies, this embodiment provides a technical solution. The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0066] This utility model addresses the common problems in existing hydraulic breakers, such as internal leakage in the piston 801 buffer leading to displacement, scoring, and oil leakage, as well as the impact of the long stroke of the piston 801 on the striking frequency and striking force. It discloses a hydraulic breaker power assembly.

[0067] See appendix Figure 1-12A hydraulic breaker power assembly includes: a chisel holder 900 for mounting a cylinder body 800 and a chisel, the chisel holder 900 for slidably mounting the chisel; and a piston 801 slidably mounted within the cylinder body 800. Specifically, the bottom end of the cylinder body 800 is sealed to the chisel holder 900. More specifically, a thrust ring 901 is also installed between the bottom end of the cylinder body 800 and the chisel holder 900. When the piston 801 slides downwards along the cylinder body 800, the bottom of the piston 801 slides down within the thrust ring 901, striking the top of the chisel to achieve the striking action. The thrust ring 901 here serves to withstand the enormous axial impact force generated by the downward movement of the piston 801 and transmit this force to the chisel holder 900 and the cylinder body. The main structure of cylinder 800 serves to stabilize the movement of piston 801, protect cylinder 800 and seals, and reduce wear. Additionally, there are two mating relationships between the bottom of piston 801 and thrust ring 901: one is axial mating, where a step on piston 801 contacts the corresponding end face of thrust ring 901 when piston 801 moves downwards; the other is radial mating, where the outer cylindrical surface of piston 801 mates with the inner cylindrical surface of thrust ring 901. This precise, small-clearance mating is primarily for accurate guidance and limiting radial runout. The directional valve is mounted on cylinder 800, and a hydraulic passage for hydraulic oil flow is provided between it and the piston chamber within cylinder 800. Hydraulic oil is controlled by reversing valves to enter different chambers of piston 801 to achieve reciprocating motion of piston 801 along cylinder 800. It can be understood that the reversing valve is mounted above cylinder 800. More specifically, a clearance block 700 is installed between the reversing valve and cylinder 800. The clearance block 700 is located between the reversing valve and cylinder 800, and a clearance chamber 701 is provided within the clearance block 700. The top of piston 801 passes through the bottom of clearance block 700 and is located within clearance block 700, with the top of piston 801 slidably and sealingly mounted with clearance block 700. The function of clearance block 700 is to slidably and sealingly mount with the top of piston 801 and to provide guidance for the sliding of piston 801. An accumulator 600 is installed... The accumulator 600 is connected to the hydraulic circuit of the directional control valve and is used to store hydraulic energy when piston 801 moves upward and to release hydraulic energy when piston 801 moves downward to increase the impact force of piston 801 during downward movement. It can be understood that the accumulator 600 is quite common in existing technology. Its principle is that a piston cup divides a chamber into two. One chamber, the oil chamber, has an opening for hydraulic oil to enter and exit, and the other chamber, the accumulator chamber, is filled with nitrogen. The working principle is that when hydraulic oil enters the accumulator 600, the hydraulic oil fills the oil chamber and squeezes the piston cup. The piston cup squeezes the nitrogen in the accumulator chamber to store energy. When the hydraulic oil flows out, the nitrogen in the accumulator chamber releases energy and squeezes the hydraulic oil in the oil chamber, converting the released energy into hydraulic oil pressure. See appendix. Figure 12The cylinder body 800 has piston chambers a805, b802, c803, and d804 arranged radially in its inner cavity. Piston chambers c803 and d804 are both located between piston chambers a805 and b802. Piston chamber a805 is connected to the first output oil passage 109 of the directional valve through the first input oil passage 806. Piston chamber b802 is connected to the second output oil passage 110 of the directional valve through the second input oil passage 807. Piston chamber c803 is located between piston chamber d804 and b802. When the first output oil passage 109 of the directional valve is energized, the hydraulic oil in piston chamber a805 pushes piston 801 upward. When the second output oil passage 110 of the directional valve is energized, the hydraulic oil in piston chamber b802 pushes piston 801 downward. It can be understood here that piston chamber a805 is an annular groove that is radially concave inside the inner bore of cylinder 800. The first input oil passage 806, connected to piston chamber a805, is located inside cylinder 800 and extends to the top of cylinder 800. Piston chamber b802 is a countersunk hole located radially concave at the top of cylinder 800, and the second input oil passage 807, connected to piston chamber b802, is located inside cylinder 800 and extends to the top of cylinder 800. Piston chambers c803 and d804 are both annular grooves that are radially concave inside the inner bore of cylinder 800. The order from top to bottom along the cylinder axial direction is: piston chamber b802, piston chamber c803, piston chamber d804, and piston chamber a805. Furthermore, the first output oil passage 109 and the second input oil passage 807 are connected through a channel provided in the clearance block 700, and the second output oil passage 110 and the second input oil passage 807 are connected through a channel provided in the clearance block 700. See Appendix. Figure 12 and 23 The piston 801 is provided with a radially concave first annular groove 8011, a second annular groove 8012, and a radially convex third annular platform 8013. The axial groove width Y of the first annular groove 8011 is greater than the distance X between the piston chamber c803 and the piston chamber d804. The groove depth X of the upper end face of the second annular groove 8012 is greater than the groove depth Z of the lower end face, so that when the second annular groove 8012 is filled with oil, it pushes the piston 801 upward. The diameter D of the piston 801 on the upper surface of the third annular platform 8013 is smaller than the diameter d of the piston 801 on the lower surface, so that when the piston chamber b802 is filled with oil, it pushes the piston 801 downward. The piston chamber b802 is located at the top of the cylinder body 800, and a buffer groove 808 is provided at the bottom of the piston chamber b802. The buffer groove 808 is slidably installed with the third annular platform 8013 of the piston 801.

[0068] See appendix Figure 1-12The reversing valve includes a valve seat 100, a valve sleeve 200, and a valve core 300. The valve seat 100 is provided with an oil inlet and an oil outlet, as well as a main oil chamber 108 connected to the oil inlet. The valve seat 100 is also provided with a first output oil passage 109 or a second output oil passage 110 connected to the main oil chamber 108. An oil inlet flange 101 and an oil outlet flange 102 are respectively installed on the oil inlet and the oil outlet. Both the oil inlet flange 101 and the oil outlet flange 102 are sealed to the valve seat 100. The oil inlet flange 101 is connected to a high-pressure oil supply tank, and the oil outlet is connected to the supply tank for hydraulic oil return. The first output oil passage 109 and the second output oil passage 110 are two different output oil passages, which are respectively connected to piston chamber a805 and piston chamber b802 to realize the upward or downward movement of piston 801. The valve seat 100 is also provided with a connecting cavity 107 for connecting to the accumulator 600. One end of the connecting cavity 107 is connected to the accumulator 600, and the other end is connected to the main oil chamber 108. The valve sleeve 200 is relatively fixedly installed inside the valve seat 100. The valve sleeve 200 and the valve seat 100 are installed with an interference fit and are sealed together. The purpose of providing the valve sleeve 200 is to facilitate replacement of the valve sleeve 200 when it is damaged by long-term use, without having to replace the valve seat 100. The valve core 300 is slidably installed inside the valve sleeve 200. When the valve core 300 slides, The system allows switching between two hydraulic circuits. One circuit connects the inlet to the main hydraulic chamber 108, which in turn connects to the accumulator 600 and the first output hydraulic circuit 109. The other circuit connects the inlet to the main hydraulic chamber 108, which in turn connects to the accumulator 600 and the second output hydraulic circuit 110. The accumulator 600's hydraulic chamber is connected to the main hydraulic chamber 108 through an opening. When the first output hydraulic circuit 109 is activated, high-pressure hydraulic oil enters the main hydraulic chamber 108 and then the accumulator 600's hydraulic chamber, compressing the piston cup to store energy. (See appendix.) Figure 12 and attached Figure 17 The valve sleeve 200 has several annular grooves on its outer circumferential surface, and several corresponding annular grooves on its inner cavity wall. The corresponding annular grooves are connected to each other to form an annular cavity. This connection can be a radial through hole or other methods. See attached diagram. Figure 17 The annular cavity includes a first annular cavity 201, a second annular cavity 202, a third annular cavity 203, a fourth annular cavity 204, and a fifth annular cavity 205. The third annular cavity 203 is connected to the main oil cavity 108, and the first annular cavity 201 is connected to the feedback oil passage 112. The piston cavity d804 is connected to the feedback oil passage 112 via an oil passage located within the cylinder body 800. Specifically, the feedback oil passage 112 connects to the channel through the bottom surface of the valve seat 100 and the passage located within the cylinder body 800, and then extends to the piston cavity d804. (See attached diagram) Figure 18The outer peripheral wall of the valve core 300 is provided with three annular grooves, namely a first annular groove 301, a second annular groove 302, and a third annular groove 303. The axial width of the second annular groove 302 is greater than the wall thickness between the third annular cavity 203 and the fourth annular cavity 204. The axial width of the first annular groove 301 is greater than the wall thickness between the second annular cavity 202 and the third annular cavity 203. The axial width of the third annular groove 303 is greater than the wall thickness between the fourth annular cavity 204 and the fifth annular cavity 205. The purpose of setting the size relationship between the width and the wall thickness here is that when the valve core 300 moves, the first annular groove 301 can simultaneously connect to the second annular cavity 202 and the third annular cavity 203, and the third annular groove 303 can simultaneously connect to the fourth annular cavity 204 and the fifth annular cavity 205. The valve core 300 has a first sealing cavity 304 at its left end and a second sealing cavity 305 with a smaller cross-sectional area at its right end. Both the first sealing cavity 304 and the second sealing cavity 305 are cylindrical cavities. A left positioning pin 400 for sealing the first sealing cavity 304 is slidably installed at the left end of the valve core 300, and a right positioning pin 500 for sealing the second sealing cavity 305 is slidably installed at the right end of the valve core 300. Both the first sealing cavity 304 and the second sealing cavity 305 have through holes along the radial direction. The through hole of the second sealing cavity 305 communicates with the second annular groove 302. When the valve core 300 is in the left extreme position, see the attached diagram. Figure 22 The first annular groove 301 is connected to the second annular cavity 202, the second annular groove 302 is connected to the third annular cavity 203, the third annular groove 303 is simultaneously connected to the fourth annular cavity 204 and the fifth annular cavity 205, and the first sealing cavity 304 is connected to the first annular cavity 201. At this time, hydraulic oil enters the main oil cavity 108 through the oil inlet via the check valve 1051 and simultaneously enters the accumulator 600 and the first output oil circuit 109. See Appendix. Figure 12When the valve core 300 is at the right end limit position, the first annular groove 301 is simultaneously connected to the second annular cavity 202 and the third annular cavity 203, the second annular groove 302 is simultaneously connected to the third annular cavity 203 and the fourth annular cavity 204, the third annular groove 303 is connected to the fifth annular cavity 205, and the through hole of the first sealing cavity 304 is connected to the first annular groove 301. At this time, the second annular cavity 202, the third annular cavity 203 and the fourth annular cavity 204 are all in a connected state. Specifically, the first output oil passage 109 is configured as two oil passages, both connected to the third annular cavity 203 and spaced 180° apart. The second output oil passage 110 is configured as four oil passages, two of which are connected to the second annular cavity 202 and spaced 180° apart, and the other two are connected to the fourth annular cavity 204 and spaced 180° apart. Therefore, when the valve core 300 is at the leftmost extreme position, the third annular cavity 203 outputs high-pressure hydraulic oil through the two oil passages of the first output oil passage 109, which enters the piston cavity a805 via the first input oil passage 806, pushing the piston 801 upward. When the valve core 300 is at the rightmost extreme position, the second output oil passage 110, which is connected to the second annular cavity 202 and the fourth annular cavity 204 respectively, outputs high-pressure hydraulic oil, which enters the piston cavity b802 via the second input oil passage 807, pushing the piston 801 downward. A front flange cover 104 and a rear flange cover 106 are also installed on the valve seat 100. The valve seat 100 is sealed to the front flange cover 104 and the rear flange cover 106. The front flange cover 104 and the rear flange cover 106 are respectively tightened to the two end faces of the valve sleeve 200. The left locating pin 400 and the right locating pin 500 are respectively tightened to the rear flange cover 106 and the front flange cover 104 at the ends away from the valve core 300. When the first sealing cavity 304 and the second sealing cavity 305 are both filled with hydraulic oil, the left locating pin 400 and the right locating pin 500 are respectively tightened to the rear flange cover 106 and the front flange cover 104.A left valve cover 105 and a right valve cover 103 are also sealed and installed on the valve seat 100. A one-way valve 1051 is installed on the left valve cover 105. The one-way valve 1051 is installed in series between the oil inlet and the main oil inlet circuit 111. The main oil inlet circuit 111 is connected to the main oil chamber 108. It can be understood that the one-way valve 1051 only allows hydraulic oil to enter the main oil chamber 108 through the oil inlet and does not allow the oil to flow back. An overflow valve 1031 is installed between the right valve cover 103 and the valve seat 100. Here, there is a cavity between the right valve cover 103 and the valve seat 100 for installing the overflow valve 1031. The overflow valve 1031 is connected in parallel with the return oil circuit and then connected to the oil outlet. The inlet of the overflow valve 1031 is connected to the first output oil passage 109 through the pilot oil passage 114. The return oil passage includes a horizontal section 113 and a vertical section 115 connected to it. The horizontal section 113 is also connected to the left end cavity 116 and the right end cavity 117. The left end cavity 116 is a cavity formed by the valve seat 100, the rear flange cover 106, the left end face of the valve sleeve 200, and the left positioning pin 400. The right end cavity 117 is a cavity formed by the valve seat 100, the front flange cover 104, the right end face of the valve sleeve 200, and the right positioning pin 500. The piston cavity c803 is connected to the vertical section 115 of the return oil passage through an oil passage provided in the cylinder body 800. The vertical section 115 of the return oil circuit extends to the bottom section of the valve seat 100, and is connected to the internal channel of the cylinder 800 and the piston chamber c803 through the passage of the clearance block 700. When the first ring platform is simultaneously connected to the piston chamber c803 and the piston chamber d804, the return oil is performed.

[0069] See appendix Figure 4 and attached Figure 16 and appendix Figure 19-21The overflow valve 1031 includes an overflow valve sleeve 10311, an overflow valve core 10312, and an overflow elastic element 10313. The overflow valve sleeve 10311 is fixed and sealed to the valve seat 100. The overflow valve core 10312 is slidably installed in the inner cavity of the overflow valve sleeve 10311, and the overflow elastic element 10313 is installed between the right side of the overflow valve core 10312 and the right valve cover 103. The overflow elastic element 10313 is a spring. The overflow valve core 10312 is provided with an overflow annular groove 103121 and an annular end face 103122 on its outer periphery. The diameter of the left side of the annular end face 103122 is smaller than that of the right side, and the cavity formed by the annular end face 103122 and the overflow valve sleeve 10311 is connected to the pilot oil passage 114 through a through hole penetrating the overflow valve core 10312. Specifically, the cavity formed by the annular end face 103122 and the overflow valve sleeve 10311 is connected to the eighth annular cavity 103 on the outer peripheral wall of the overflow valve sleeve 10311 through the through hole penetrating the overflow valve core 10312. 115 is connected, the eighth annular cavity 103115 is connected to the pilot oil passage 114, and the other end of the pilot oil passage 114 is connected to the first output oil passage 109. The inner cavity of the overflow valve sleeve 10311 is provided with two annular grooves, namely the fourth annular groove 103111 and the fifth annular groove 103112. The fourth annular groove 103111 is connected to the outer peripheral wall of the overflow valve sleeve 10311 through a radially provided through hole, and the fifth annular groove 103112 is connected to the oil outlet through a radial through hole. When the overflow valve core 10312 is located at the leftmost position of the stroke, that is, when the overflow valve core 10312 is at its leftmost position, the overflow valve core 10311 is connected to the first output oil passage 109. Figure 16 In the state where the overflow valve core 10312 is in the overflow annular groove 103121, it is connected to the fourth annular groove 103111 of the overflow valve sleeve 10311. The fourth annular groove 103111 is connected to the fifth annular cavity 205 through the return oil channel 118. When the overflow valve core 10312 is located at the rightmost position of the stroke, the overflow annular groove 103121 of the overflow valve core 10312 is connected to the fourth annular groove 103111 and the fifth annular groove 103112 of the overflow valve sleeve 10311. The outer peripheral wall of the overflow valve sleeve 10311 is provided with a sixth annular cavity 103113 and a seventh annular cavity 103114 that are respectively connected to the fourth annular groove 103111 and the fifth annular groove 103112. The fourth annular groove 103111 and the sixth annular cavity 103113 are connected through a number of radial through holes. The fifth annular groove 103112 and the seventh annular cavity 103114 are connected through a number of radial through holes. The fourth annular groove 103111 is connected to the fifth annular cavity 205 through a return oil channel 118 provided inside the valve seat 100. The fifth annular groove 103112 is connected to the oil outlet through a radial through hole.

[0070] When the hydraulic breaker power assembly of this utility model is working, high-pressure hydraulic oil enters the one-way valve 1051 of the valve seat 100 through the inlet flange 101, and then enters the main oil inlet circuit 111 through the one-way valve 1051. At this time, the valve core 300 is in the closed state. Figure 22 In the leftmost extreme position, hydraulic oil enters one oil passage of the first output oil passage 109 through the main oil inlet passage 111, and the other enters the main oil chamber 108 and simultaneously enters the accumulator 600 and the third annular chamber 203. The hydraulic oil in the third annular chamber 203 enters the other oil passage of the first output oil passage 109. At this time, the accumulator 600 is in the accumulator cylinder 800, and the hydraulic oil in the first output oil passage 109 enters the piston chamber a805 through a pipe. The piston 801 moves upwards during the return energy storage stage. (See appendix.) Figure 13 Meanwhile, the fourth annular cavity 204 and the fifth annular cavity 205 are connected, and the fifth annular cavity 205 is connected to the return oil circuit. The fourth annular cavity 204 is connected to the second output oil circuit 110 to return the hydraulic oil in the piston cavity b802 connected to the second output oil circuit 110. At the same time, the pilot oil circuit 114 connected to the first output oil circuit 109 outputs a portion of high-pressure oil into the overflow valve 1031 to push the overflow valve core 10312 to move and compress the overflow spring. The overflow annular groove 103121 is connected to the fourth annular groove 103111 and the fifth annular groove 103112. The fifth annular cavity 205 is connected to the fourth annular groove 103111, and the fifth annular groove 103112 is connected to the oil outlet to form a return oil passage. When piston 801 reaches a certain stroke, that is, when the second annular ring moves to the piston chamber d804 and connects with it, the hydraulic oil in the first output oil circuit 109 connects with the feedback oil circuit 112 of the reversing valve through the piston chamber d804. At this time, it is in the reversing triggering stage. See Appendix. Figure 14 Hydraulic oil from feedback oil circuit 112 enters the first annular cavity 201. The hydraulic oil in the first annular cavity 201 enters the first seal, pushing the valve core 300 to move and open it. This means the third annular cavity 203 is connected to the fourth annular cavity 204 and the second annular cavity 202. At this time, the hydraulic oil in the main oil cavity 108 switches to the second output oil circuit 110 to output hydraulic oil. Simultaneously, the accumulator 600 releases its stored energy. The hydraulic oil output from the second output oil circuit 110 acts on another piston cavity b802 of the hydraulic hammer. At this time, the piston 801 moves downwards along the opposite path, i.e., the stroke impact stage. (See Appendix) Figure 15Simultaneously, the third annular cavity 203 connects with the second annular groove 302 of the valve core 300, and hydraulic oil enters the second sealing cavity 305. As the piston 801 continues to descend, the feedback oil circuit 112 and the return oil circuit form a connecting cavity 107. At this time, the return oil circuit connects to the fifth annular cavity 205. The fifth annular cavity 205 connects to the fourth annular groove 103111 and the fifth annular groove 103112 of the overflow valve sleeve 10311 and then returns oil through the outlet, while simultaneously closing the overflow valve 1031. Since the cross-sectional area of ​​the second sealing cavity 305 is smaller than that of the first sealing cavity 304, the second sealing cavity 305 moves the valve core 300 to close it under the action of hydraulic oil. The connecting passage between the third annular cavity 203, the second annular cavity 202, and the fourth annular cavity 204 is cut off. At this time, the second output oil circuit 110 switches to the first output oil circuit 109, and the piston 801 is at its lowest point, impacting the drill rod to complete the impact action. Then, this process is repeated to return to the return energy storage stage, completing the repeated impact action.

[0071] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0072] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic breaker power assembly, characterized in that, include: A drill rod holder (900) is used to mount a cylinder body (800) and a drill rod. The drill rod holder (900) is used to slide the drill rod. A piston (801) is slidably mounted inside the cylinder body (800). A reversing valve is mounted on the cylinder body (800) and has a hydraulic oil passage for hydraulic oil to flow between it and the piston chamber inside the cylinder body (800). The reversing valve controls the hydraulic oil to enter different chambers of the piston (801) by reversing to realize the reciprocating motion of the piston (801) along the cylinder body (800). An accumulator (600) is installed on the directional valve and connected to the hydraulic circuit of the directional valve. It is used to store hydraulic energy when the piston (801) moves upward and to release hydraulic energy when the piston (801) moves downward to increase the impact force when the piston (801) moves downward.

2. The hydraulic breaker power assembly according to claim 1, characterized in that, The cylinder body (800) has piston chambers a (805), b (802), c (803), and d (804) arranged radially in its inner cavity. Piston chambers c (803) and d (804) are located between piston chambers a (805) and b (802). Piston chamber a (805) is connected to the first output oil passage (109) of the reversing valve via a first input oil passage (806). Piston chamber b (802) is connected to... The piston chamber c (803) is connected to the second output oil passage (110) of the reversing valve via the second input oil passage (807). The piston chamber c (803) is located between the piston chamber d (804) and the piston chamber b (802). When the first output oil passage (109) of the reversing valve is energized, the hydraulic oil in the piston chamber a (805) pushes the piston (801) upward. When the second output oil passage (110) of the reversing valve is energized, the hydraulic oil in the piston chamber b (802) pushes the piston (801) downward.

3. The hydraulic breaker power assembly according to claim 2, characterized in that, The piston (801) is provided with a radially concave first annular groove (8011), a second annular groove (8012), and a radially convex third annular platform. (8013) The width of the first annular groove (8011) along the axial direction is greater than the distance between the piston chamber c (803) and the piston chamber d (804). The groove depth of the upper end face of the second annular groove (8012) is greater than the groove depth of the lower end face so that the piston (801) can be pushed upward when the second annular groove (8012) is filled with oil. The diameter of the upper surface of the third annular platform (8013) is greater than the diameter of the lower surface so that the piston (801) can be pushed downward when the piston chamber b (802) is filled with oil.

4. The hydraulic breaker power assembly according to claim 3, characterized in that, The piston chamber b (802) is located at the top of the cylinder body (800), and a buffer groove (808) is provided at the bottom of the piston chamber b (802). The buffer groove (808) is slidably installed with the third ring platform (8013) of the piston (801).

5. A hydraulic breaker power assembly according to claim 4, characterized in that, The reversing valve includes a valve seat (100), a valve sleeve (200), and a valve core (300): The valve seat (100) is provided with an oil inlet and an oil outlet, as well as a main oil chamber (108) connected to the oil inlet, and the valve seat (100) is provided with a first output oil passage (109) or a second output oil passage (110) connected to the main oil chamber (108). The valve seat (100) is also provided with a connecting cavity (107) for connecting the accumulator (600), one end of which is connected to the accumulator (600) and the other end is connected to the main oil chamber (108); The valve sleeve (200) is fixedly installed inside the valve seat (100), and the valve core (300) is slidably installed inside the valve sleeve (200). When the valve core (300) slides, it realizes the switching of two oil circuits. One oil circuit is an oil inlet connected to the main oil chamber (108), which is connected to the accumulator (600) and the first output oil circuit (109) respectively. The other oil circuit is an oil inlet connected to the main oil chamber (108), which is connected to the accumulator (600) and the second output oil circuit (110) respectively.

6. A hydraulic breaker power assembly according to claim 5, characterized in that, The valve sleeve (200) has several annular grooves on its outer circumferential surface and several annular grooves with corresponding positions on its inner cavity wall. The annular grooves with corresponding positions are connected to form an annular cavity. The annular cavity includes a first annular cavity (201), a second annular cavity (202), a third annular cavity (203), a fourth annular cavity (204), and a fifth annular cavity (205). The third annular cavity (203) is connected to the main oil cavity (108), and the first annular cavity (201) is connected to the feedback oil circuit (112). The feedback oil circuit (112) is connected to the bottom end face of the valve seat (100).

7. A hydraulic breaker power assembly according to claim 6, characterized in that, The valve core (300) has three annular grooves on its outer peripheral wall, namely a first annular groove (301), a second annular groove (302), and a third annular groove (303). A first sealing cavity (304) is provided at the left end of the valve core (300), and a second sealing cavity (305) with a cross-sectional area smaller than the first sealing cavity (304) is provided at the right end. A left positioning pin (400) for sealing the first sealing cavity (304) is slidably installed at the left end of the valve core (300), and a right positioning pin (500) for sealing the second sealing cavity (305) is slidably installed at the right end of the valve core (300). Both the first sealing cavity (304) and the second sealing cavity (305) have radially arranged through holes, wherein the through hole of the second sealing cavity (305) communicates with the second annular groove (302). The valve core (300) is positioned... When the valve core (300) is at the left end limit position, the first annular groove (301) is connected to the second annular cavity (202), the second annular groove (302) is connected to the third annular cavity (203), the third annular groove (303) is connected to the fourth annular cavity (204) and the fifth annular cavity (205) at the same time, and the first sealing cavity (304) is connected to the first annular cavity (201). When the valve core (300) is at the right end limit position, the first annular groove (301) is connected to the second annular cavity (202) and the third annular cavity (203) at the same time, the second annular groove (302) is connected to the third annular cavity (203) and the fourth annular cavity (204) at the same time, the third annular groove (303) is connected to the fifth annular cavity (205), and the through hole of the first sealing cavity (304) is connected to the first annular groove (301).

8. A hydraulic breaker power assembly according to claim 7, characterized in that, The valve seat (100) is also equipped with a front flange cover (104) and a rear flange cover (106), wherein the front flange cover (104) and the rear flange cover (106) are respectively installed to tighten against the two ends of the valve sleeve (200), and the left locating pin (400) and the right locating pin (500) are respectively tightened against the rear flange cover (106) and the front flange cover (104) at the ends away from the valve core (300).

9. A hydraulic breaker power assembly according to claim 8, characterized in that, A left valve cover (105) and a right valve cover (103) are also installed on the valve seat (100). A one-way valve (1051) is installed on the left valve cover (105). The one-way valve (1051) is installed in series between the oil inlet and the main oil inlet circuit (111). The main oil inlet circuit (111) is connected to the main oil chamber (108). An overflow valve (1031) is installed between the right valve cover (103) and the valve seat (100). The overflow valve (1031) is connected in parallel with the return oil circuit and then connected to the oil outlet. The inlet of the overflow valve (1031) is connected to the first output oil circuit through the pilot oil circuit (114). The return oil circuit (109) is connected, and the return oil circuit includes a horizontal section (113) and a vertical section (115) connected to it. The horizontal section (113) of the return oil circuit is also connected to the left end cavity (116) and the right end cavity (117). The left end cavity (116) is a cavity formed by the valve seat (100), the rear flange cover (106), the left end face of the valve sleeve (200), and the left positioning pin (400). The right end cavity (117) is a cavity formed by the valve seat (100), the front flange cover (104), the right end face of the valve sleeve (200), and the right positioning pin (500).

10. A hydraulic breaker power assembly according to claim 9, characterized in that, The piston chamber d (804) is connected to the feedback oil passage (112) through an oil passage provided in the cylinder body (800), and the piston chamber c (803) is connected to the vertical section (115) of the return oil passage through an oil passage provided in the cylinder body (800).

Images