Cylinder body of a hydraulic breaker

Abstract

The present invention provides a cylinder body of a hydraulic breaker, belonging to the technical field of hydraulic breaker. It solves the technical problems of the existing hydraulic breaker, such as the unilateral oil inlet, which leads to the roughening of the middle cylinder body, and the poor overall stability of the hydraulic breaker. The rear part of the upper side surface of the cylinder body of the hydraulic breaker is provided with an oil inlet hole, the front part of the inner peripheral wall of the cylinder body is provided with a front oil groove, and the cylinder body is provided with a high-pressure oil channel for connecting the oil inlet hole and the front oil groove. There are four high-pressure oil channels, and four oil inlets are arranged on the bottom of the front oil groove along the circumferential interval. The front end of each high-pressure oil channel is connected to the corresponding oil inlet, and the rear ends of the four high-pressure oil channels are connected. The present invention uses four high-pressure oil channels to feed oil, so that the two sides of the piston can maintain the same pressure when the oil is fed, avoiding the unilateral squeezing of the piston by the hydraulic oil, increasing the stability of the hydraulic breaker, and reducing the possibility of roughening.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic breaker hammers, in particular to a cylinder body of a hydraulic breaker hammer. Background Art

[0002] At present, a hydraulic breaker generally has only one or two high-pressure oil passages and return oil passages, and both are arranged on one side of the cylinder body close to the reversing valve.

[0003] For example, the hydraulic breaker represented by South Korea's Sanshui has its oil inlet and return interfaces set on the middle cylinder body, and has four main oil passages, which include high-pressure oil passages and return oil passages, and are all set in the upper half of the middle cylinder body; another example is the hydraulic breaker represented by Japan's Furukawa, which also has four main oil passages, which also include high-pressure oil passages and return oil passages, and the four main oil passages are all set in the upper half of the middle cylinder body.

[0004] Furthermore, the invention patent with application number 2010205553164 discloses a new oil circuit and structure for a hydraulic breaker, which has only two main oil passages, one in the front and one in the rear; the above invention and the cylinder structure of the hydraulic breaker of South Korea's Sanshui and Japan's Furukawa can all refer to the specific embodiments of the above invention and the description in the drawings of the specification.

[0005] The existing hydraulic breaker has only one or two high-pressure oil passages and return oil passages, and both are located on the same side of the piston. When the hydraulic oil flows into the front oil tank from the high-pressure oil passage, the high-pressure hydraulic oil will impact the piston due to the single-sided oil inflow. In this case, the middle cylinder body may be roughened, affecting the normal operation of the hydraulic breaker. Summary of the invention

[0006] In view of the shortcomings of the prior art, an object of the present invention is to provide a cylinder body which can avoid unilateral oil inflow and make the piston move more stably.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A cylinder body of a hydraulic breaker, the cylinder body comprising a front cylinder body, a middle cylinder body and a rear cylinder body connected in sequence, an oil inlet hole is provided at the rear portion of the upper side surface of the cylinder body, a front oil groove is provided at the front portion of the inner peripheral wall of the cylinder body, and a high-pressure oil passage for connecting the oil inlet hole and the front oil groove is provided in the cylinder body, characterized in that: there are four high-pressure oil passages, four oil inlets are provided on the bottom of the front oil groove at intervals along its circumference, the front end of each high-pressure oil passage is connected to the corresponding oil inlet, and the rear ends of the four high-pressure oil passages are connected.

[0009] The cylinder of the hydraulic breaker is provided with four high-pressure oil channels, which supply oil to the front oil tank from four directions, so that the hydraulic oil is supplied to the piston more evenly; the hydraulic oil enters the cylinder of the hydraulic breaker from the oil inlet hole, passes through the four high-pressure oil channels, and when the four high-pressure oil channels jointly replenish the hydraulic oil, the impact forces of the hydraulic oil on the piston offset each other, thereby balancing the impact of the hydraulic oil on the piston, so that the piston is kept in the middle of the cylinder when the hydraulic breaker is operating normally.

[0010] This design uses four high-pressure oil channels to feed oil, so that the two sides of the piston can maintain the same pressure when the oil is fed in, avoiding the unilateral squeezing of the piston by the hydraulic oil, increasing the stability of the hydraulic breaker and reducing the possibility of hair pulling.

[0011] In the cylinder body of the above-mentioned hydraulic breaker, the oil inlet is arranged in a circular array with the central axis of the front oil groove as the center, the high-pressure oil channel is long and parallel to the central axis of the cylinder body, and the four high-pressure oil channels are arranged in a circular array with the central axis of the cylinder body as the center.

[0012] The cylinder body has high-pressure oil channels and corresponding oil inlets arranged in an annular array, so that the impact forces of the hydraulic oil on the piston offset each other, avoiding unilateral squeezing of the piston by the hydraulic oil, increasing the stability of the hydraulic breaker and reducing the possibility of hair pulling.

[0013] In the cylinder body of the above-mentioned hydraulic breaker, a high-pressure oil chamber is provided at the rear of the cylinder body, the rear parts of the four high-pressure oil passages are connected to the high-pressure oil chamber through the second connecting hole, the oil inlet hole is connected to the high-pressure oil chamber, and the front parts of the four high-pressure oil passages are connected to the oil inlet of the front oil tank through the first connecting hole.

[0014] The design of the above-mentioned high-pressure oil chamber allows the hydraulic oil that enters the cylinder body from the oil inlet hole to first enter the high-pressure oil chamber, and then flow evenly into the four high-pressure oil passages through the high-pressure oil chamber, so that the hydraulic oil entering the four high-pressure oil passages is more uniform, further balancing the impact of the hydraulic oil on the piston, avoiding unilateral squeezing of the piston by the hydraulic oil, increasing the stability of the hydraulic breaker, and reducing the possibility of hair pulling.

[0015] In the cylinder body of the hydraulic breaker, a mounting groove is provided at the center of the rear end surface of the rear cylinder body, the mounting groove penetrates the high-pressure oil chamber along the axial direction of the rear cylinder body, and a reversing valve is provided in the mounting groove.

[0016] This design embeds the reversing valve originally located on the upper part of the middle cylinder body into the rear part of the rear cylinder body, omitting the valve seat of the reversing valve. This not only reduces the screws used to fix the valve seat of the reversing valve, but also avoids a series of problems caused by loosening of the screws, which is beneficial to improving the stability of the hydraulic breaker during operation.

[0017] In the cylinder body of the above-mentioned hydraulic breaker, bolt holes are provided on the four corners of the middle cylinder body and the rear cylinder body, and connecting grooves are provided on the four corners of the front cylinder body. A main body bolt is penetrated through the bolt hole, and a main body nut threadedly connected to the main body bolt is provided in the connecting groove; the oil inlet hole is arranged on the upper side surface of the rear cylinder body, the high-pressure oil channel includes a rear high-pressure oil hole arranged in the rear cylinder body and a front high-pressure oil hole arranged in the middle cylinder body, the front oil groove is arranged at the front part of the middle cylinder body, the front end of the front high-pressure oil hole is connected to the first connecting hole, the rear end of the front high-pressure oil hole is connected to the front end of the rear high-pressure oil hole, and the rear end of the rear high-pressure oil hole is connected to the second connecting hole.

[0018] The cylinder body of the hydraulic breaker includes a front cylinder body, a middle cylinder body and a rear cylinder body, which is not only convenient for production and manufacturing, but also makes the assembly of the drill rod and the piston more convenient; the designs of the connecting grooves, bolt holes, main body bolts and main body nuts are all used to fix the front cylinder body, the middle cylinder body and the rear cylinder body, making the connection between the three closer.

[0019] In the above-mentioned cylinder body of a hydraulic breaker hammer, an oil outlet hole is provided on the upper side surface of the rear cylinder body, a front return oil groove is provided on the inner peripheral wall of the middle cylinder body, the front return oil groove is located on the rear side of the front oil groove, a front return oil hole connected with the front return oil groove is provided in the middle cylinder body, a rear return oil hole capable of connecting with the front return oil hole is provided in the rear cylinder body, and the rear part of the rear return oil hole is connected with the oil outlet hole; there are at least two front return oil holes and rear return oil holes, and the front return oil holes and the rear return oil holes are arranged in a one-to-one correspondence, and the front return oil holes and the rear return oil holes are arranged in a circular array with the central axis of the front return oil groove as the center, and the bottom of the front return oil groove is provided with oil return ports with the same number as the front return oil holes at intervals along its circumference, the front part of the front return oil hole is connected with the corresponding oil return port, and the rear parts of all the rear return oil holes are connected.

[0020] In the cylinder body of the hydraulic breaker, there are four front oil return holes and four rear oil return holes, the front oil return holes and the corresponding front high-pressure oil holes are staggered, and the rear oil return holes and the corresponding rear high-pressure oil holes are staggered.

[0021] When the cylinder of the hydraulic breaker needs to return oil, the front oil return groove in the middle of the piston returns oil through four front oil return holes and four rear oil return holes. The radial forces of the oil return also offset each other, so that the two sides of the piston maintain the same pressure when oil is discharged and when oil discharge is completed, avoiding unilateral squeezing of the piston by the hydraulic oil, increasing the stability of the hydraulic breaker, and reducing the possibility of hair pulling.

[0022] In the cylinder body of the above-mentioned hydraulic breaker, a middle oil return groove and a piston sleeve are provided at the rear end of the middle cylinder body, and at least three inner oil return holes connected to the middle oil return groove are provided in an annular array on the piston sleeve, and each front oil return hole is connected to the middle oil return groove through a third connecting hole.

[0023] Each of the above-mentioned front oil return holes is connected to the middle oil return groove through the third connecting hole, that is, the third connecting holes are also arranged in a ring array. The inner oil return holes arranged in the ring array can offset the radial forces at the middle oil return groove, so that the two sides of the piston can maintain the same pressure when oil is discharged and when oil discharge is completed, avoiding unilateral squeezing of the piston by the hydraulic oil, further increasing the stability of the hydraulic breaker and reducing the possibility of hair pulling.

[0024] In the cylinder body of the above-mentioned hydraulic breaker, an oil return chamber is provided in the rear cylinder body, and the oil return chamber is arranged on the rear side of the high-pressure oil chamber. The rear ends of the four rear oil return holes are connected to the oil return chamber through the third connecting hole, and the oil outlet hole is connected to the oil return chamber or at least one oil return hole.

[0025] The above-mentioned oil return chamber can accommodate the hydraulic oil generated by the oil return, and at the same time can balance the oil pressure in each rear oil return hole through the oil return chamber, avoiding the pressure difference on the piston side when the oil is discharged and when the oil discharge is completed, further increasing the stability of the hydraulic breaker and reducing the possibility of roughening.

[0026] In the cylinder body of the above-mentioned hydraulic breaker, the mounting groove passes through the return oil chamber, the rear end of the high-pressure oil chamber is connected to the mounting groove, a sealing baffle is provided in the mounting groove to separate the high-pressure oil chamber and the return oil chamber, and a plug is provided at the notch of the mounting groove to seal it.

[0027] The structure of the high-pressure oil chamber, oil return chamber and mounting groove can reduce the manufacturing difficulty of the rear cylinder body and facilitate production. The design of the sealing baffle can avoid mutual interference between the high-pressure oil chamber and the oil return chamber, which is beneficial to improving the stability of the cylinder body during operation.

[0028] In the above-mentioned cylinder body of a hydraulic breaker, the plug includes a sealing part and an abutment part formed at the front end of the sealing part, the sealing part is sealingly connected to the mounting groove, the diameter of the abutment part is smaller than the diameter of the mounting groove, and the front end of the abutment part abuts against the sealing baffle.

[0029] The design of the above-mentioned plug can not only be used to seal the installation groove, but also can support the sealing baffle, so that the high-pressure oil chamber and the return oil chamber cannot be connected. It has a simple structure, is easy to install, and has good stability after installation.

[0030] In the cylinder body of the above-mentioned hydraulic breaker, the reversing valve includes a reversing valve body, a valve sleeve and a valve cover. The valve sleeve is arranged on the outside of the reversing valve body, the valve cover is fixedly connected to the rear cylinder body, and the inner end of the valve cover is sealed to the inner side wall of the valve sleeve.

[0031] The cylinder body of the hydraulic breaker has the reversing valve arranged on the rear cylinder body. This design simplifies the structure of the hydraulic breaker. When the reversing valve needs to be replaced or repaired, it is only necessary to open the valve cover, making the disassembly and maintenance of the reversing valve more convenient.

[0032] In the cylinder body of the hydraulic breaker, a signal groove is provided between the front oil groove and the front return oil groove, and at least two signal oil passages for connecting the signal groove and the reversing valve are arranged in a circular array in the cylinder body.

[0033] The signal oil passages arranged in the annular array can offset the pressures of the hydraulic oil entering the signal groove from the signal oil passages, thereby avoiding unilateral squeezing of the piston by the hydraulic oil, further increasing the stability of the hydraulic breaker and reducing the possibility of roughening.

[0034] In the cylinder body of the above-mentioned hydraulic breaker, the rear part of the valve sleeve is provided with signal valve holes with the same number as the signal oil channels, and each signal valve hole is connected to the corresponding signal oil channel. The middle part of the valve sleeve is provided with high-pressure valve holes with the same number as the high-pressure oil channels, and each high-pressure valve hole is connected to the corresponding high-pressure oil channel through the corresponding second connecting hole. The front and rear sides of the high-pressure valve holes are provided with oil return valve holes with the same number as the rear return oil holes, and each oil return valve hole is connected to the corresponding rear return oil hole through the corresponding fourth connecting hole.

[0035] The design of the above-mentioned valve sleeve structure can make the oil pressure in each signal oil channel the same, the oil pressure in each high-pressure oil channel the same, and the oil pressure in each front oil return hole and rear oil return hole the same, thereby avoiding unilateral squeezing of the piston by the hydraulic oil, further increasing the stability of the hydraulic breaker, and reducing the possibility of hair pulling.

[0036] Compared with the prior art, the technical effects of the present invention are:

[0037] The present invention allows oil to be introduced through four high-pressure oil passages, so that the two sides of the piston can maintain the same pressure when the oil is introduced, avoiding the unilateral squeezing of the piston by the hydraulic oil, increasing the stability of the hydraulic breaker, and reducing the possibility of hair pulling. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0039] Figure 2 It is an overall cross-sectional view of the present invention.

[0040] Figure 3 yes Figure 2 Cross-sectional view at point aa.

[0041] Figure 4 yes Figure 2 Cross-sectional view at bb in the middle.

[0042] Figure 5 It is a rear view of the middle cylinder body of the present invention.

[0043] Figure 6 It is a top view of the rear cylinder body of the present invention.

[0044] Figure 7 It is a structural schematic diagram of the rear cylinder body of the present invention.

[0045] Figure 8 yes Figure 6 Cross-sectional view at cc.

[0046] Fig. 9 yes Figure 6 Cross-sectional view at dd in the middle.

[0047] Fig.10 yes Figure 2 A partial enlarged view of point A in the middle.

[0048] Fig.11 yes Figure 2 A partial enlarged view of point B in the middle.

[0049] Fig.12 yes Figure 2 A partial enlarged view of point C in the middle.

[0050] In the figure, 1, front cylinder body; 11, connecting groove; 2, middle cylinder body; 21, front oil groove; 211, oil inlet; 22, first connecting hole; 23, front return oil groove; 231, return oil port; 24, middle return oil groove; 25, piston sleeve; 251, inner return oil hole; 26, third connecting hole; 27, signal groove; 3, rear cylinder body; 31, high pressure oil chamber; 32, return oil chamber; 33, second connecting hole; 35, mounting groove; 36, Sealing baffle; 37, plug; 371, sealing part; 372, abutting part; 41, front high-pressure oil hole; 42, rear high-pressure oil hole; 51, front return oil hole; 52, rear return oil hole; 6, signal oil channel; 7, bolt hole; 81, oil inlet hole; 82, oil outlet hole; 9, reversing valve; 91, reversing valve body; 92, valve sleeve; 921, high-pressure valve hole; 922, return oil valve hole; 923, signal valve hole; 93, valve cover. DETAILED DESCRIPTION

[0051] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0052] The rear part of the upper side of the cylinder body of the hydraulic breaker is provided with an oil inlet hole 81, the front part of the inner peripheral wall of the cylinder body is provided with a front oil groove 21, and the cylinder body is provided with a high-pressure oil channel for connecting the oil inlet hole 81 and the front oil groove 21, which is characterized in that: there are four high-pressure oil channels, and four oil inlets 211 are arranged at intervals along the circumference of the groove bottom of the front oil groove 21, and the front end of each high-pressure oil channel is connected to the corresponding oil inlet 211, and the rear ends of the four high-pressure oil channels are connected. The cylinder body of the hydraulic breaker is provided with four high-pressure oil channels, and oil is supplied to the front oil groove 21 from four directions, so that the hydraulic oil is supplied to the piston more evenly; the hydraulic oil enters the cylinder body of the hydraulic breaker from the oil inlet hole 81, passes through the four high-pressure oil channels, and when the four high-pressure oil channels jointly replenish the hydraulic oil, the impact force of the piston from the hydraulic oil offsets each other, balancing the impact of the hydraulic oil on the piston, so that the piston is kept in the middle of the cylinder body when the hydraulic breaker is operating normally. This design uses four high-pressure oil channels to feed oil, so that the two sides of the piston can maintain the same pressure when the oil is fed in, avoiding the unilateral squeezing of the piston by the hydraulic oil, increasing the stability of the hydraulic breaker and reducing the possibility of hair pulling.

[0053] like Figure 3 As shown, the oil inlet 211 is arranged in a circular array with the central axis of the front oil groove 21 as the center, the high-pressure oil channel is long and parallel to the central axis of the cylinder body, and the four high-pressure oil channels are arranged in a circular array with the central axis of the cylinder body as the center; a high-pressure oil chamber 31 is provided at the rear of the cylinder body, the rear parts of the four high-pressure oil channels are connected to the high-pressure oil chamber 31 through the second connecting hole 33, the oil inlet hole 81 is connected to the high-pressure oil chamber 31, and the front parts of the four high-pressure oil channels are connected to the oil inlet 211 of the front oil groove 21 through the first connecting hole 22.

[0054] The cylinder body is provided with a high-pressure oil channel and a corresponding oil inlet 211 in a circular array, so that the impact force of the hydraulic oil on the piston offsets each other, avoids the unilateral squeezing of the piston by the hydraulic oil, increases the stability of the hydraulic breaker, and reduces the possibility of hair pulling; the design of the above-mentioned high-pressure oil chamber 31 can make the hydraulic oil entering the cylinder body from the oil inlet hole 81 first enter the high-pressure oil chamber 31, and then flow into the four high-pressure oil channels evenly through the high-pressure oil chamber 31, so that the hydraulic oil entering the four high-pressure oil channels is more uniform, further balancing the impact of the hydraulic oil on the piston, avoiding the unilateral squeezing of the piston by the hydraulic oil, increasing the stability of the hydraulic breaker, and reducing the possibility of hair pulling.

[0055] like Figure 1 , Figure 2 and Figure 3As shown, the cylinder body includes a front cylinder body 1, a middle cylinder body 2 and a rear cylinder body 3 which are connected in sequence, and bolt holes 7 are provided on the four corners of the middle cylinder body 2 and the rear cylinder body 3, and connecting grooves 11 are provided on the four corners of the front cylinder body 1, and a main body bolt is penetrated through the bolt hole 7, and a main body nut threadedly connected to the main body bolt is provided in the connecting groove 11; the oil inlet hole 81 is provided on the upper side surface of the rear cylinder body 3, the high-pressure oil channel includes a rear high-pressure oil hole 42 provided in the rear cylinder body 3 and a front high-pressure oil hole 41 provided in the middle cylinder body 2, the front oil groove 21 is provided at the front part of the middle cylinder body 2, the front end of the front high-pressure oil hole 41 is connected to the first connecting hole 22, the rear end of the front high-pressure oil hole 41 is connected to the front end of the rear high-pressure oil hole 42, and the rear end of the rear high-pressure oil hole 42 is connected to the second connecting hole 33. The cylinder body of the hydraulic breaker includes a front cylinder body 1, a middle cylinder body 2 and a rear cylinder body 3, which is not only convenient for production and manufacturing, but also makes the assembly of the drill rod and the piston more convenient; the connection groove 11, the bolt hole 7, the main body bolt and the main body nut are all designed to fix the front cylinder body 1, the middle cylinder body 2 and the rear cylinder body 3, making the connection between the three closer.

[0056] Further, such as Figure 4 and Figure 5 As shown, an oil outlet hole 82 is provided on the upper side of the rear cylinder body 3, a front oil return groove 23 is provided on the inner peripheral wall of the middle cylinder body 2, and the front oil return groove 23 is located at the rear side of the front oil groove 21. A front oil return hole 51 connected to the front oil return groove 23 is provided in the middle cylinder body 2, and a rear oil return hole 52 capable of connecting to the front oil return hole 51 is provided in the rear cylinder body 3, and the rear part of the rear oil return hole 52 is connected to the oil outlet hole 82; there are at least two front oil return holes 51 and rear oil return holes 52, and the front oil return holes 51 and the rear oil return holes 52 are arranged one by one, and the front oil return holes 51 and the rear oil return holes 52 are arranged one by one. The front oil return holes 1 and the rear oil return holes 52 are arranged in a circular array with the central axis of the front oil return groove 23 as the center. The bottom of the front oil return groove 23 is provided with oil return ports 231 of the same number as the front oil return holes 51 along its circumferential intervals. The front part of the front oil return hole 51 is connected with the corresponding oil return port 231, and the rear parts of all the rear oil return holes 52 are connected. There are four front oil return holes 51 and four rear oil return holes 52. The front oil return holes 51 and the corresponding front high-pressure oil holes 41 are staggered, and the rear oil return holes 52 and the corresponding rear high-pressure oil holes 42 are staggered. When the cylinder body of the hydraulic breaker needs to return oil, the front oil return groove 23 in the middle of the piston returns oil through the four front oil return holes 51 and the four rear oil return holes 52. The radial forces of the oil return also offset each other, so that the two sides of the piston maintain the same pressure when the oil is discharged and when the oil is completed, avoiding the unilateral squeezing of the piston by the hydraulic oil, increasing the stability of the hydraulic breaker, and reducing the possibility of hair pulling.

[0057] like Figure 2 and Fig.11As shown, the rear end of the middle cylinder body 2 is provided with a middle oil return groove 24 and a piston sleeve 25, and the piston sleeve 25 is provided with at least three inner oil return holes 251 in an annular array connected to the middle oil return groove 24, and each front oil return hole 51 is connected to the middle oil return groove 24 through the third connecting hole 26. Each of the above-mentioned front oil return holes 51 is connected to the middle oil return groove 24 through the third connecting hole 26, that is, the third connecting hole 26 is also arranged in an annular array, and the inner oil return holes 251 arranged in an annular array can make the radial forces at the middle oil return groove 24 offset each other, so that the two sides of the piston can maintain the same pressure when the oil is discharged and when the oil is completed, avoiding the unilateral squeezing of the piston by the hydraulic oil, further increasing the stability of the hydraulic breaker, and reducing the possibility of hair pulling.

[0058] like Figure 7 and Fig.10 As shown, an oil return chamber 32 is provided in the rear cylinder body 3, and the oil return chamber 32 is provided at the rear side of the high-pressure oil chamber 31. The rear ends of the four rear oil return holes 52 are connected to the oil return chamber 32 through the third connecting hole 26, and the oil outlet hole 82 is connected to the oil return chamber 32 or at least one of the oil return holes. The above-mentioned oil return chamber 32 can accommodate the hydraulic oil generated by the oil return, and at the same time, the oil pressure in each rear oil return hole 52 can be balanced through the oil return chamber 32, thereby avoiding the pressure difference on the piston side when the oil is discharged and when the oil is completed, further increasing the stability of the hydraulic breaker and reducing the possibility of hair pulling.

[0059] like Figure 7 As shown, a mounting groove 35 is provided at the center position of the rear end surface of the rear cylinder body 3, and the mounting groove 35 passes through the oil return chamber 32. The rear end of the high-pressure oil chamber 31 is connected to the mounting groove 35. A sealing baffle 36 is provided in the mounting groove 35 to separate the high-pressure oil chamber 31 from the oil return chamber 32. A plug 37 is provided at the notch of the mounting groove 35 to seal it; the plug 37 includes a sealing portion 371 and an abutting portion 372 formed at the front end of the sealing portion 371. The sealing portion 371 is sealed and connected to the mounting groove 35. The diameter of the abutting portion 372 is smaller than the diameter of the mounting groove 35, and the front end of the abutting portion 372 abuts against the sealing baffle 36.

[0060] The structure of the high-pressure oil chamber 31, the return oil chamber 32 and the mounting groove 35 can reduce the manufacturing difficulty of the rear cylinder body 3 and facilitate production. The design of the sealing baffle 36 can avoid mutual interference between the high-pressure oil chamber 31 and the return oil chamber 32, which is beneficial to improving the stability of the cylinder body during operation. The design of the plug 37 can not only be used to seal the mounting groove 35, but also can support the sealing baffle 36, so that the high-pressure oil chamber 31 and the return oil chamber 32 cannot be connected. The structure is simple, the installation is convenient, and the stability after installation is relatively good.

[0061] like Fig.11As shown, a mounting groove 35 is provided at the center position of the rear end surface of the rear cylinder body 3, and the mounting groove 35 penetrates the high-pressure oil chamber 31 along the axial direction of the rear cylinder body 3, and a reversing valve 9 is provided in the mounting groove 35; the reversing valve 9 comprises a reversing valve body 91, a valve sleeve 92 and a valve cover 93, the valve sleeve 92 is sleeved on the outside of the reversing valve body 91, the valve cover 93 is fixedly connected to the rear cylinder body 3, and the inner end of the valve cover 93 is sealed with the inner side wall of the valve sleeve 92; a signal groove 27 is provided between the front oil groove 21 and the front return oil groove 23, and at least two signal oil passages 6 for connecting the signal groove 27 and the reversing valve 9 are arranged in a ring array in the cylinder body.

[0062] The cylinder body of the hydraulic breaker has the reversing valve 9 arranged on the rear cylinder body 3. This design simplifies the structure of the hydraulic breaker. When the reversing valve 9 needs to be replaced or repaired, it is only necessary to open the valve cover 93, making the disassembly and maintenance of the reversing valve 9 more convenient. Furthermore, the design embeds the reversing valve 9 originally located on the upper part of the middle cylinder body 2 into the rear part of the rear cylinder body 3, omitting the valve seat of the reversing valve 9, which not only reduces the screws used to fix the valve seat of the reversing valve 9, but also avoids a series of problems caused by the loosening of the screws, which is beneficial to improving the stability of the hydraulic breaker during operation. The signal oil channel 6 arranged in the annular array can make the hydraulic oil pressure entering the signal groove 27 from the signal oil channel 6 offset each other, avoiding the unilateral squeezing of the piston by the hydraulic oil, further increasing the stability of the hydraulic breaker and reducing the possibility of roughening.

[0063] Furthermore, the rear portion of the valve sleeve 92 is provided with the same number of signal valve holes 923 as the signal oil passage 6, and each signal valve hole 923 is connected to the corresponding signal oil passage 6. The middle portion of the valve sleeve 92 is provided with the same number of high-pressure valve holes 921 as the high-pressure oil passage, and each high-pressure valve hole 921 is connected to the corresponding high-pressure oil passage through the corresponding second connecting hole 33. The front and rear sides of the high-pressure valve holes 921 are provided with the same number of return oil valve holes 922 as the rear return oil holes 52, and each return oil valve hole 922 is connected to the corresponding rear return oil hole 52 through the corresponding fourth connecting hole. The design of the valve sleeve 92 structure can make the oil pressure in each signal oil passage 6 the same, the oil pressure in each high-pressure oil passage the same, and the oil pressure in each front return oil hole 51 and rear return oil hole 52 the same, thereby avoiding the unilateral squeezing of the piston by the hydraulic oil, further increasing the stability of the hydraulic breaker, and reducing the possibility of roughening.

[0064] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope defined by the claims of the present invention.

Claims

1. A cylinder body of a hydraulic breaker, the cylinder body comprising a front cylinder body (1), a middle cylinder body (2) and a rear cylinder body (3) connected in sequence, an oil inlet hole (81) being provided at the rear of the upper side surface of the cylinder body, a front oil groove (21) being provided at the front of the inner peripheral wall of the cylinder body, and a high-pressure oil passage for connecting the oil inlet hole (81) and the front oil groove (21) being provided in the cylinder body, characterized in that: There are four high-pressure oil passages, and four oil inlets (211) are arranged at intervals along the circumference of the groove bottom of the front oil groove (21), the front end of each high-pressure oil passage is connected to the corresponding oil inlet (211), and the rear ends of the four high-pressure oil passages are connected; The oil inlet (211) is arranged in a circular array with the central axis of the front oil groove (21) as the center, the high-pressure oil channel is in a long strip shape and parallel to the central axis of the cylinder body, the four high-pressure oil channels are arranged in a circular array with the central axis of the cylinder body as the center, and the rear of the cylinder body is provided with a high-pressure oil chamber (31) ， The rear portions of the four high-pressure oil passages are connected to the high-pressure oil chamber (31) through the second connecting hole (33), the oil inlet hole (81) is connected to the high-pressure oil chamber (31), and the front portions of the four high-pressure oil passages are connected to the oil inlet (211) of the front oil groove (21) through the first connecting hole (22); A mounting groove (35) is provided at the center of the rear end surface of the rear cylinder body (3), the mounting groove (35) penetrates the high-pressure oil chamber (31) along the axial direction of the rear cylinder body (3), and a reversing valve (9) is provided in the mounting groove (35).

2. The cylinder of a hydraulic breaker according to claim 1, characterized in that: Bolt holes (7) are provided at the four corners of the middle cylinder body (2) and the rear cylinder body (3), and connecting grooves (11) are provided at the four corners of the front cylinder body (1). A main body bolt is provided through the bolt hole (7), and a main body nut threadedly connected to the main body bolt is provided in the connecting groove (11); the oil inlet hole (81) is provided on the upper side of the rear cylinder body (3); the high-pressure oil passage comprises a rear high-pressure oil hole (42) provided in the rear cylinder body (3) and a front high-pressure oil hole (41) provided in the middle cylinder body (2); the front oil groove (21) is provided at the front part of the middle cylinder body (2); the front end of the front high-pressure oil hole (41) is communicated with the first connecting hole (22), the rear end of the front high-pressure oil hole (41) is communicated with the front end of the rear high-pressure oil hole (42), and the rear end of the rear high-pressure oil hole (42) is communicated with the second connecting hole (33).

3. The cylinder of a hydraulic breaker according to claim 2, characterized in that: An oil outlet hole (82) is provided on the upper side surface of the rear cylinder body (3); a front oil return groove (23) is provided on the inner peripheral wall of the middle cylinder body (2); the front oil return groove (23) is located at the rear side of the front oil groove (21); a front oil return hole (51) communicating with the front oil return groove (23) is provided in the middle cylinder body (2); a rear oil return hole (52) capable of communicating with the front oil return hole (51) is provided in the rear cylinder body (3); the rear portion of the rear oil return hole (52) is communicated with the oil outlet hole (82); the front oil return hole (51) and the rear oil return hole (52) are connected to each other. There are at least two oil holes (52), the front oil return holes (51) and the rear oil return holes (52) are arranged in a one-to-one correspondence, the front oil return holes (51) and the rear oil return holes (52) are arranged in a ring array with the central axis of the front oil return groove (23) as the center, and the groove bottom of the front oil return groove (23) is provided with oil return ports (231) with the same number as the front oil return holes (51) at intervals along its circumference, the front part of the front oil return hole (51) is connected to the corresponding oil return port (231), and the rear parts of all the rear oil return holes (52) are connected.

4. The cylinder of a hydraulic breaker according to claim 3, characterized in that: There are four front oil return holes (51) and four rear oil return holes (52), the front oil return holes (51) and the corresponding front high-pressure oil holes (41) are staggered, and the rear oil return holes (52) and the corresponding rear high-pressure oil holes (42) are staggered.

5. The cylinder of a hydraulic breaker according to claim 4, characterized in that: A middle oil return groove (24) and a piston sleeve (25) are provided at the rear end of the middle cylinder body (2). The piston sleeve (25) is provided with at least three inner oil return holes (251) in an annular array and connected to the middle oil return groove (24). Each front oil return hole (51) is connected to the middle oil return groove (24) via a third connecting hole (26).

6. The cylinder of a hydraulic breaker according to claim 4, characterized in that: An oil return chamber (32) is provided in the rear cylinder body (3), and the oil return chamber (32) is provided at the rear side of the high-pressure oil chamber (31). The rear ends of the four rear oil return holes (52) are connected to the oil return chamber (32) via the third connecting hole (26), and the oil outlet hole (82) is connected to the oil return chamber (32) or at least one of the oil return holes.

7. The cylinder of a hydraulic breaker according to claim 6, characterized in that: The mounting groove (35) penetrates the oil return chamber (32); the rear end of the high-pressure oil chamber (31) is in communication with the mounting groove (35); a sealing baffle (36) is provided in the mounting groove (35) for separating the high-pressure oil chamber (31) from the oil return chamber (32); and a plug (37) is provided at the notch of the mounting groove (35) for sealing the mounting groove (35).

8. The cylinder of a hydraulic breaker according to claim 7, characterized in that: The plug (37) comprises a sealing portion (371) and an abutting portion (372) formed at the front end of the sealing portion (371); the sealing portion (371) is sealingly connected to the mounting groove (35); the diameter of the abutting portion (372) is smaller than the diameter of the mounting groove (35); and the front end of the abutting portion (372) abuts against the sealing baffle (36).

9. The cylinder of a hydraulic breaker according to claim 6, characterized in that: The reversing valve (9) comprises a reversing valve body (91), a valve sleeve (92) and a valve cover (93); the valve sleeve (92) is sleeved on the outside of the reversing valve body (91); the valve cover (93) is fixedly connected to the rear cylinder body (3); and the inner end of the valve cover (93) is sealedly connected to the inner side wall of the valve sleeve (92).

10. The cylinder of a hydraulic breaker according to claim 9, characterized in that: A signal groove (27) is provided between the front oil groove (21) and the front return oil groove (23), and at least two signal oil passages (6) for connecting the signal groove (27) and the reversing valve (9) are arranged in a circular array in the cylinder body.

11. The cylinder of a hydraulic breaker according to claim 10, characterized in that: The rear portion of the valve sleeve (92) is provided with the same number of signal valve holes (923) as the signal oil passage (6), and each signal valve hole (923) is communicated with the corresponding signal oil passage (6). The middle portion of the valve sleeve (92) is provided with the same number of high-pressure valve holes (921) as the high-pressure oil passage, and each high-pressure valve hole (921) is communicated with the corresponding high-pressure oil passage through the corresponding second connecting hole (33). The front side and the rear side of the high-pressure valve hole (921) are provided with the same number of oil return valve holes (922) as the rear oil return hole (52), and each oil return valve hole (922) is communicated with the corresponding rear oil return hole (52) through the corresponding fourth connecting hole.

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