A front cylinder and breaking hammer for a rock drill

Abstract

The utility model relates to the technical field of anchor rod operation equipment, concretely relates to a front cylinder body and breakage hammer for anchor rod operation, include: the outer shell, the drill rod is set in its inner chamber, the drill rod is matched with the clearance of outer shell inner wall, the spacing assembly for limiting the axial stroke of drill rod is set between the drill rod and outer shell, oil mist guide assembly includes the oil mist cavity of setting in the rear end of outer shell, the oil mist cavity is connected oil mist delivery pipe through the oil inlet of the side wall of outer shell, and the oil mist of entering the oil mist cavity moves to the front end direction of outer shell through the clearance between drill rod and outer shell inner wall, and blows from the front end of outer shell to the external environment, through above setting, effectively ensured the drilling quality and operation efficiency, reduced the drill rod fracture probability, prolonged the service life, reduced the maintenance cost, avoided the problem that the drill rod movement was blocked, stuck and even damaged because of the rock dust and water seepage into the clearance between drill rod and outer shell.

Description

Technical Field

[0001] This utility model relates to a front cylinder and a hydraulic breaker for anchor bolting operations, belonging to the technical field of anchor bolting equipment. Background Technology

[0002] As the most basic component of roadway support, rock bolts are used not only in mines but also in engineering technology for the main reinforcement of slopes, tunnels, and dams. In roadway support and rock mass reinforcement projects, rock bolt installation requires pre-drilling holes in the rock strata. Currently, imported rock drills are mostly used for drilling, but these drills are expensive, have short maintenance cycles, and high maintenance costs. Therefore, the use of low-cost hydraulic breakers to replace rock drills is considered. However, the front cylinder structure of traditional hydraulic breakers has significant defects, making it unsuitable for rock bolt operations. First, there is the problem of drilling trajectory deviation: the gap between the drill rod and the inner wall of the cylinder is too large, causing radial sway of the drill rod during high-speed reciprocating motion, resulting in uneven hole walls that cannot meet the verticality and hole wall regularity requirements for rock bolt installation. Second, when drilling in the roadway roof, rock cuttings, dust, and seepage water can easily penetrate the movement gap between the drill rod and the outer shell, causing the drill rod to be obstructed, jammed, or even damaged. Therefore, researching a new type of front cylinder and breaker for rock bolt operations is of great practical significance. Utility Model Content

[0003] This utility model addresses the shortcomings of existing technologies by providing a front cylinder and a hydraulic breaker for anchor bolt operations.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A front cylinder body for anchor bolt operation includes: an outer shell, an inner cavity of which is provided with a drill rod that can move axially, the drill rod is clearance-fitted with the inner wall of the outer shell, and a limiting component for limiting the axial travel of the drill rod is provided between the drill rod and the outer shell.

[0005] An oil mist guiding assembly includes an oil mist chamber disposed at the rear end of the housing. The oil mist chamber is connected to an oil mist delivery pipe through an oil inlet penetrating the side wall of the housing. The oil mist entering the oil mist chamber moves towards the front end of the housing through the gap between the probe and the inner wall of the housing, and is blown out from the front end of the housing to the external environment.

[0006] Furthermore, the oil mist chamber includes a first annular cavity and a second annular cavity arranged sequentially along the axial direction of the drill rod. The inner diameter D1 of the first annular cavity is larger than the inner diameter D2 of the second annular cavity, and the two are coaxially arranged.

[0007] Furthermore, the first annular cavity and the second annular cavity are connected by a conical transition surface, and the conical transition surface is connected to both the first annular cavity and the second annular cavity by a circular arc. The inclination angle α of the conical transition surface is 20-40 degrees.

[0008] Furthermore, the oil inlet extends to the conical transition surface, and the conical transition surface is provided with a swirl guide groove at the outlet position of the oil inlet.

[0009] Furthermore, the inner diameter D1 of the first annular cavity is 1.5-1.7 times the inner diameter D2 of the second annular cavity.

[0010] Furthermore, it also includes a guide sleeve fixed to the front end of the outer casing. The drill rod passes through the guide sleeve and is in clearance fit with the inner wall of the guide sleeve. An annular boss is provided at the connection end of the guide sleeve and the outer casing. A sealing ring is embedded in the outer wall of the annular boss. An annular groove adapted to the annular boss is opened at the front end of the outer casing. The oil mist entering the oil mist chamber moves sequentially towards the front end of the guide sleeve through the gap between the drill rod and the inner wall of the outer casing, and the gap between the drill rod and the guide sleeve, and is blown out from the front end of the guide sleeve to the external environment.

[0011] Furthermore, both the inner wall of the outer shell and the inner wall of the guide sleeve are provided with a number of oil-spreading grooves. The oil-spreading grooves are arranged at equal intervals along the axial direction of the drill rod, and the cross-section of the oil-spreading grooves is semi-circular, semi-elliptical, or triangular.

[0012] Furthermore, an annular water baffle is fitted onto the outer wall of the drill rod.

[0013] Furthermore, the limiting component includes pin holes symmetrically opened on both sides of the outer casing. The pin holes are sealed by sealing bolts. The outer casing is provided with limiting pins at both ends located in the pin holes on both sides. The axial direction of the limiting pins is perpendicular to the axial direction of the drill rod. The drill rod is provided with a limiting groove corresponding to the position of the limiting pin. The limiting groove cooperates with the limiting pin to limit the reciprocating stroke of the drill rod.

[0014] This utility model also provides a hydraulic breaker, including the aforementioned front cylinder, a middle cylinder, and a rear cylinder. The middle cylinder has a built-in piston, and the front end of the piston is adapted to the shape of the oil mist chamber.

[0015] The beneficial effects of this utility model are:

[0016] ① This application can effectively suppress the radial runout of the drill rod, improve the directional consistency of the drill rod during reciprocating motion, and avoid the problem of irregular hole walls caused by poor consistency of drill rod movement direction when drilling with traditional hydraulic breakers, which makes the drilling unsuitable for anchor bolt operations. The drilling trajectory deviation problem is reduced by more than 65%, and the hole wall unevenness is ≤5%, which effectively ensures drilling quality and work efficiency. Furthermore, by improving the consistency of the drill rod movement direction, the probability of drill rod breakage is effectively reduced, the service life is extended, and the maintenance cost is reduced.

[0017] ② As the oil mist moves from the oil mist chamber toward the head of the drill rod, it forms a uniform oil film on the surface of the drill rod, further extending its service life. Furthermore, when drilling holes in the tunnel roof, the high-pressure oil mist blown outwards forms a positive pressure barrier, preventing rock dust and seepage water from intruding into the gap between the drill rod and the outer casing. This avoids problems such as the drill rod being obstructed, jammed, or even damaged due to rock dust and seepage water entering the gap between the drill rod and the outer casing, further extending its service life. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the front cylinder block provided in Embodiment 1 of this application;

[0019] Figure 2 This is a left view of the front cylinder block provided in Embodiment 1 of this application;

[0020] Figure 3 for Figure 2 Schematic diagram of the three-dimensional cross-sectional structure along the AA direction;

[0021] Figure 4 for Figure 3 Enlarged view at point B in the middle;

[0022] Figure 5 This is a schematic diagram of a cross-sectional structure from another perspective provided in Embodiment 1 of this application;

[0023] Figure 6 This is a schematic diagram of the three-dimensional structure of the guide sleeve provided in Embodiment 1 of this application;

[0024] Figure 7 This is a schematic diagram of the cross-sectional structure of the guide sleeve provided in Embodiment 3 of this application.

[0025] Reference numerals: 1. Outer shell; 2. Drill rod; 21. Limiting groove; 3. Oil mist chamber; 31. First annular cavity; 32. Second annular cavity; 33. Conical transition surface; 4. Oil inlet; 5. Swirl guide groove; 6. Guide sleeve; 61. Annular boss; 7. Oil distribution groove; 8. Annular baffle plate; 9. Pin hole; 10. Sealing bolt; 11. Annular groove; 12. Limiting pin. Detailed Implementation

[0026] The specific embodiments of this utility model are described in detail below. This utility model can be implemented in many ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used is for describing particular embodiments only and is not intended to limit the scope of this invention.

[0028] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Example 1

[0031] like Figure 1-5 As shown, this utility model provides a front cylinder for anchor bolt operation, including: an outer shell 1, the inner cavity of which is provided with a drill rod 2 that can move axially, the drill rod 2 being clearance-fitted with the inner wall of the outer shell 1, and a limiting component for limiting the axial travel of the drill rod 2 being provided between the drill rod 2 and the outer shell 1. Preferably, the gap between the drill rod 2 and the inner wall of the outer shell 1 is 0.15-0.3 mm;

[0032] The oil mist guiding assembly includes an oil mist chamber 3 disposed at the rear end of the outer shell 1. The oil mist chamber 3 is connected to an oil mist delivery pipe through an oil inlet 4 that penetrates the side wall of the outer shell 1. The oil mist entering the oil mist chamber 3 moves towards the front end of the outer shell 1 through the gap between the rod 2 and the inner wall of the outer shell 1, and is blown out from the front end of the outer shell 1 to the external environment. It is understandable that the rear end of the front cylinder needs to be connected to the front end of the middle cylinder during use. A sealing ring is provided at the connection between the two, and an oil seal is provided at the piston movement position of the middle cylinder. Therefore, the oil mist entering the oil mist chamber 3 can only move through a single path, that is, through the gap between the chisel 2 and the inner wall of the outer shell 1 towards the front end of the outer shell 1. It should be noted that the oil mist chamber 3 and the outer shell 1 are integral structures formed by processing. The "rear end" mentioned above refers to the end away from the chisel 2, and the "front end" refers to the end close to the chisel 2. This will not be elaborated further. The oil mist delivery pipe is connected to the oil mist generating device. The oil mist delivery pipe is a well-known technology in the field, so it is not shown in the attached drawings. In order to ensure that the oil mist can move smoothly to the front end of the outer shell 1 and be blown outward, the oil mist pressure of this application should be greater than 3 MPa.

[0033] First, this application effectively suppresses the radial runout of the drill rod 2, improves the directional consistency of the drill rod 2 during reciprocating motion, and avoids the problem of irregular hole walls caused by poor directional consistency of the drill rod 2 during drilling with traditional hydraulic breakers, making the drilling unsuitable for anchor bolt operations. The drilling trajectory deviation problem is reduced by more than 65%, and the hole wall unevenness is ≤5%, effectively ensuring drilling quality and work efficiency. Furthermore, improving the directional consistency of the drill rod 2 effectively reduces the probability of drill rod 2 breakage, extends its service life, and reduces maintenance costs. Second, during the process of oil mist moving from the oil mist chamber 3 towards the head of the drill rod 2, the oil mist can form a uniform oil film on the surface of the drill rod 2, further extending the service life of the drill rod 2. Moreover, when drilling the tunnel roof, the high-pressure oil mist blown outward can form a positive pressure barrier, preventing rock cuttings, dust, and seepage water from entering the gap area between the drill rod 2 and the outer shell 1. This avoids the problem of the drill rod 2 being obstructed, jammed, or even damaged due to rock cuttings, dust, and seepage water entering the gap between the drill rod 2 and the outer shell 1, further extending its service life.

[0034] Specifically, such as Figure 3 , 5As shown, the oil mist chamber 3 includes a first annular cavity 31 and a second annular cavity 32 arranged sequentially along the axial direction of the drill rod 2. The inner diameter D1 of the first annular cavity 31 is larger than the inner diameter D2 of the second annular cavity 32, and the two are coaxially arranged. By setting the first annular cavity 31, it plays a role in buffering the kinetic energy of the oil mist, which can reduce the initial flow velocity of the radially input oil mist, reduce the radial impact kinetic energy carried by the oil mist, and avoid the problem of oil mist pressure loss caused by radial impact on the drill rod 2 during the movement of the oil mist, which in turn leads to uneven oil film and failure to be blown out from the front end of the outer shell 1. The second annular cavity 32, through cross-sectional area contraction, works with the piston to play a high-pressure acceleration role, which can significantly improve the axial kinetic energy of the oil mist, ensure that the oil mist can move smoothly to the front end of the outer shell 1 and be blown out from the front end of the outer shell 1, and also achieve oil film stability under dynamic working conditions.

[0035] Priority, such as Figure 5 As shown, the inner diameter D1 of the first annular cavity 31 is 1.5-1.7 times the inner diameter D2 of the second annular cavity 32. This parameter setting is crucial, as it coordinates oil mist pressure loss with operational reliability in low-temperature environments. It ensures that the oil mist pressure loss is ≤8% while guaranteeing a certain residence time for the oil mist within the first annular cavity 31, compensating for its fluidity loss at low temperatures. Furthermore, it works in conjunction with the second annular cavity 32 and the piston, where high-speed shearing and heat generation in the second annular cavity 32 raises the oil mist temperature, preventing condensation of the lubricating oil in the oil mist and effectively improving operational reliability in low-temperature environments. If the inner diameter D1 of the first annular cavity 31 is less than 1.5 times the inner diameter D2 of the second annular cavity 32, then the first... The annular cavity 31 cannot buffer the oil mist. The radial impact kinetic energy of the oil mist is too large, the turbulence is enhanced, and the oil mist pressure loss is increased, resulting in uneven oil film and failure to be blown out from the front end of the outer shell 1. If D1 is greater than 1.7 times D2, the speed of the oil mist after entering the first annular cavity 31 will be excessively reduced. Due to the increased surface tension of the oil mist at low temperature, the oil droplet aggregation is aggravated at low speed, which can easily form a lubrication blind zone, resulting in local dry friction of the drill rod 2. Furthermore, the oil mist stays in the first annular cavity 31 for too long. In low temperature environment, the oil mist temperature is more likely to drop below the dew point, thus affecting the reliability of operation.

[0036] Specifically, such as Figure 3 , 5As shown, the first annular cavity 31 and the second annular cavity 32 are connected by a conical transition surface 33. The conical transition surface 33 is connected to both the first annular cavity 31 and the second annular cavity 32 by a circular arc. The inclination angle α of the conical transition surface 33 is 20-40 degrees. By setting a tapered transition surface 33 with a gradually narrowing cross section, the oil mist can be guided to flow smoothly from the first annular cavity 31 to the second annular cavity 32, maintaining the continuity of the laminar boundary layer, avoiding pressure loss caused by turbulence, and suppressing stress concentration between the first annular cavity 31 and the second annular cavity 32, which helps to prevent cracking damage. If the inclination angle α of the tapered transition surface 33 is greater than 40 degrees, the oil mist is prone to boundary layer separation during the flow from the first annular cavity 31 to the second annular cavity 32, resulting in oil mist pressure fluctuation. Furthermore, when the oil mist passes through the tapered transition surface 33, it cannot be guided to flow smoothly along the inner wall of the second annular cavity 32, causing the oil mist to be ejected and collide with the end of the drill rod 2, resulting in pressure loss. This leads to discontinuous oil film coverage on the drill rod 2 and insufficient pressure of the high-pressure oil mist blown outward, which cannot effectively block rock dust and seepage water from invading the gap area between the drill rod 2 and the outer shell 1.

[0037] Specifically, such as Figure 4 As shown, the oil inlet 4 extends to the conical transition surface 33, and the conical transition surface 33 is provided with a swirling guide groove 5 at the outlet position of the oil inlet 4. After the oil mist enters the oil mist chamber 3, part of the oil mist enters the first annular cavity 31 for kinetic energy buffering, and another part of the oil mist is induced by the swirling guide groove 5 to form a weak swirling flow, so that the oil mist can cover the inner wall of the outer shell 1 circumferentially. While reducing the radial impact kinetic energy of the oil mist, it not only solves the problem of uneven oil mist dispersion caused by radial oil inlet, but also increases the oil film coverage to >95%, and further avoids the problem of pressure loss caused by direct impact of oil mist on the drill rod 2.

[0038] Specifically, the front cylinder block described in this application also includes a guide sleeve 6 fixed to the front end of the outer casing 1. The drill rod 2 passes through the guide sleeve 6 and is clearance-fitted with the inner wall of the guide sleeve 6. The gap between the drill rod 2 and the inner wall of the guide sleeve 6 is 0.15-0.3 mm. An annular boss 61 is provided at the connection end between the guide sleeve 6 and the outer casing 1. A sealing ring is embedded in the outer wall of the annular boss 61. An annular groove 11 adapted to the annular boss 61 is opened at the front end of the outer casing 1. The oil mist entering the oil mist chamber 3 moves sequentially through the gap between the drill rod 2 and the inner wall of the outer casing 1, and the gap between the drill rod 2 and the guide sleeve 6 towards the front end of the guide sleeve 6, and is blown out from the front end of the guide sleeve 6 to the external environment. It should be noted that the guide sleeve 6 and the outer casing 1 are connected by a sealing ring. The outer casing 1 is fixed by bolts surrounding the annular boss 61. The annular boss 61 and the guide sleeve 6 are integrally formed by machining. With this setting, firstly, the guide sleeve 6 can further suppress the radial runout of the drill rod 2, further ensuring the drilling quality. Secondly, in the past, during the use of the front cylinder block, the front end face of the outer casing 1 was easily damaged due to harsh working environment or collision with the drill rod 2 during use. By setting the guide sleeve 6, the outer casing 1 can be effectively protected from damage. Even if the front end face of the guide sleeve 6 is damaged, only the guide sleeve 6 needs to be replaced, which greatly reduces maintenance costs. Finally, by setting the annular boss 61 and the annular groove 11, the two work together to improve the sealing and ensure the guiding.

[0039] Specifically, such as Figure 3 As shown, in order to further improve the uniformity of the oil film and avoid dry friction of the drill rod 2, several oil distribution grooves 7 are provided on the inner wall of the outer shell 1 and the inner wall of the guide sleeve 6. The several oil distribution grooves 7 are arranged at equal intervals along the axial direction of the drill rod 2, and the cross-section of the oil distribution groove 7 is semi-circular, semi-elliptical or triangular.

[0040] Specifically, an annular water baffle 8 is fitted onto the outer wall of the drill rod 2. When drilling the top wall, the annular water baffle 8 can effectively block falling rock dust and seepage water, reducing the pressure requirements on the oil mist positive pressure barrier.

[0041] Specifically, the limiting component includes pin holes 9 symmetrically opened on both sides of the outer casing 1. The pin holes 9 are sealed by sealing bolts 10 to keep them airtight and prevent oil mist leakage. The outer casing 1 is provided with limiting pins 12 at both ends located in the pin holes 9 on both sides. The axial direction of the limiting pins 12 is perpendicular to the axial direction of the drill rod 2. The drill rod 2 is provided with a limiting groove 21 corresponding to the position of the limiting pins 12. It can be understood that when the drill rod 2 descends to the lowest point, the limiting pin 12 abuts against one side of the limiting groove 21 to limit it. When the drill rod 2 ascends to the highest point, the limiting pin 12 abuts against the other side of the limiting groove 21 to limit it. The limiting groove 21 and the limiting pin 12 cooperate to limit the reciprocating stroke of the drill rod 2.

[0042] Example 2

[0043] This application also provides a hydraulic breaker, including a front cylinder as described in Embodiment 1, a middle cylinder, and a rear cylinder. The middle cylinder has a built-in piston, and the front end of the piston is adapted to the shape of the oil mist chamber 3. It should be noted that the middle cylinder and the rear cylinder are common knowledge known to those skilled in the art, and therefore are not shown in the drawings. Here, the shape adaptation refers to the fact that the front end of the piston is provided with a coaxial structure with different diameters that are adapted to the shape of the first annular cavity 31 and the second annular cavity 32, so that the piston can smoothly enter and exit the oil mist chamber 3 and impact the chisel 2.

[0044] Example 3

[0045] like Figure 7 As shown, in order to further ensure the kinetic energy of the oil mist and better block falling rock dust and seepage water, several spirally arranged oil distribution grooves 7 are evenly opened on the inner wall of the guide sleeve 6 along its axial direction. The cross-section of the oil distribution grooves 7 is semi-circular, semi-elliptical or triangular.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are exhaustively listed. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] For those skilled in the art, various modifications and improvements can be made without departing from the concept of this utility model, and these modifications and improvements are all within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims.

Claims

1. A front cylinder body for anchor bolting operations, characterized in that, include: The outer shell has an inner cavity with a drill rod that can move axially. The drill rod is clearance-fitted with the inner wall of the outer shell, and a limiting component is provided between the drill rod and the outer shell to limit the axial travel of the drill rod. An oil mist guiding assembly includes an oil mist chamber disposed at the rear end of the housing. The oil mist chamber is connected to an oil mist delivery pipe through an oil inlet penetrating the side wall of the housing. The oil mist entering the oil mist chamber moves towards the front end of the housing through the gap between the probe and the inner wall of the housing, and is blown out from the front end of the housing to the external environment.

2. The front cylinder body for anchor bolting operations according to claim 1, characterized in that, The oil mist chamber includes a first annular cavity and a second annular cavity arranged sequentially along the axial direction of the drill rod. The inner diameter D1 of the first annular cavity is larger than the inner diameter D2 of the second annular cavity, and the two are coaxially arranged.

3. A front cylinder body for anchor bolting operations according to claim 2, characterized in that, The first annular cavity and the second annular cavity are connected by a conical transition surface. The conical transition surface is connected to both the first annular cavity and the second annular cavity by a circular arc. The inclination angle α of the conical transition surface is 20-40 degrees.

4. A front cylinder body for anchor bolting operations according to claim 3, characterized in that, The oil inlet extends to the conical transition surface, and the conical transition surface is provided with a swirl guide groove at the outlet position of the oil inlet.

5. A front cylinder body for anchor bolting operations according to claim 4, characterized in that, The inner diameter D1 of the first annular cavity is 1.5-1.7 times the inner diameter D2 of the second annular cavity.

6. A front cylinder body for anchor bolting operations according to claim 1, characterized in that, It also includes a guide sleeve fixed to the front end of the outer shell. The drill rod passes through the guide sleeve and is clearance-fitted with the inner wall of the guide sleeve. An annular boss is provided at the connection end of the guide sleeve and the outer shell. A sealing ring is embedded in the outer wall of the annular boss. An annular groove adapted to the annular boss is opened at the front end of the outer shell. The oil mist entering the oil mist chamber moves sequentially through the gap between the drill rod and the inner wall of the outer shell, and the gap between the drill rod and the guide sleeve towards the front end of the guide sleeve, and is blown out from the front end of the guide sleeve to the external environment.

7. A front cylinder body for anchor bolting operations according to claim 6, characterized in that, Both the inner wall of the outer shell and the inner wall of the guide sleeve are provided with a number of oil distribution grooves. The oil distribution grooves are arranged at equal intervals along the axial direction of the drill rod, and the cross-section of the oil distribution groove is semi-circular, semi-elliptical or triangular.

8. A front cylinder body for anchor bolting operations according to claim 6, characterized in that, The outer wall of the drill rod is fitted with an annular water baffle.

9. A front cylinder body for anchor bolting operations according to claim 1, characterized in that, The limiting component includes pin holes symmetrically opened on both sides of the outer casing. The pin holes are sealed by sealing bolts. The outer casing is provided with limiting pins at both ends located in the pin holes on both sides. The axial direction of the limiting pins is perpendicular to the axial direction of the drill rod. The drill rod is provided with a limiting groove corresponding to the position of the limiting pin. The limiting groove cooperates with the limiting pin to limit the reciprocating stroke of the drill rod.

10. A hydraulic breaker, characterized in that, The system includes the front cylinder block as described in any one of claims 1-9, and further includes a middle cylinder block and a rear cylinder block, wherein the middle cylinder block houses a piston, and the front end of the piston is adapted to the shape of the oil mist chamber.

Images