Hydraulic impactor and rock drill

Abstract

The utility model provides a hydraulic impactor and a rock drill, and relates to the field of impactors. The hydraulic impactor comprises a cylinder body, a piston, a punch, a first supporting sleeve and an elastic sealing ring, the piston is movably arranged in the cylinder body in a penetrating mode, the punch is arranged at one end of the cylinder body, and the piston is configured to linearly slide in a reciprocating mode in the axial direction of the cylinder body so as to apply impulse to the punch. The punch is used for carrying out impact operation under the impulse action of the piston; the first supporting sleeve is arranged on the inner side of the cylinder body in a sleeving mode, the end, facing the punch, of the piston is arranged in the first supporting sleeve in a sliding and penetrating mode, an annular installation groove is defined between the inner wall of the cylinder body and the outer wall of the first supporting sleeve, and the elastic sealing ring is installed in the annular installation groove and is in a compressed state in the radial direction of the cylinder body. The utility model provides a hydraulic impactor and a rock drill which are good in sealing performance.

Description

Technical Field

[0001] The utility model relates to the field of impactors, in particular to a hydraulic impactor and a rock drill. Background Art

[0002] Hydraulic impactors have become the leading products in rock drilling and blasting projects due to their advantages of high efficiency, low cost, cleanliness and safety.

[0003] Existing hydraulic impactors generally include a cylinder body, a piston, a guide sleeve, an impact head and other components, wherein the guide sleeve is arranged between the piston and the cylinder body, and the piston is slidably arranged relative to the guide sleeve. When the piston makes reciprocating linear motion along the inside of the cylinder body under the push of high-pressure oil, the front end of the moving piston hits the impact head, thereby performing related impact operations such as blasting, drilling, and hammering on the target object through the impact head.

[0004] However, the guide sleeve and the piston of the existing hydraulic impactor are prone to seal failure, which may lead to cavitation, erosion, wear and other problems on the guide sleeve and the piston. Utility Model Content

[0005] In order to solve at least one of the problems mentioned in the background technology, the utility model provides a hydraulic impactor and a rock drill with good sealing performance.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] In a first aspect, the utility model provides a hydraulic impactor, comprising a cylinder, a piston, a punch, a first support sleeve and an elastic sealing ring, wherein the piston is movably arranged in the cylinder, the punch is arranged at one end of the cylinder, the piston is configured to slide back and forth linearly along the axial direction of the cylinder to apply an impulse to the punch, and the punch is used to perform an impact operation under the action of the impulse of the piston;

[0008] The first support sleeve is sleeved on the inner side of the cylinder body, and the end of the piston facing the punch can be slidably inserted into the first support sleeve. An annular mounting groove is formed between the inner wall of the cylinder body and the outer wall of the first support sleeve. The elastic sealing ring is installed in the annular mounting groove, and the elastic sealing ring is in a compressed state along the radial direction of the cylinder body.

[0009] As an optional embodiment, the first support sleeve includes a first sleeve body and a second sleeve body integrally formed along its own axial direction, the diameter of the second sleeve body is larger than the diameter of the first sleeve body, the outer peripheral surface of the first sleeve body, the end surface of the second sleeve body and the inner wall of the cylinder body are jointly arranged to form an annular mounting groove, and the end surface of the cylinder body is abutted against the end surface of the second sleeve body.

[0010] As an optional embodiment, it also includes a buffer sleeve, which is arranged outside the first support sleeve, and one end of the buffer sleeve is connected to the end of the cylinder body. The buffer sleeve, the outer peripheral surface of the second sleeve and the end surface of the cylinder body form a first hydraulic oil chamber, and the first hydraulic oil chamber is connected to the return oil pipe of the impactor.

[0011] As an optional embodiment, the first support sleeve also includes a first annular groove and a flow channel, the first annular groove is located on the inner wall of the first support sleeve, the flow channel is opened on the second sleeve body, and the two ends of the flow channel are respectively connected to the first annular groove and the first hydraulic oil chamber, so that when the piston retracts, the oil in the first hydraulic oil chamber is sent into the first annular groove through the flow channel.

[0012] As an optional implementation, the inner side of the first support sleeve has a plurality of second annular grooves spaced apart in the axial direction.

[0013] As an optional embodiment, it also includes a second support sleeve, which is sleeved on the inner side of the cylinder body. The second support sleeve and the first support sleeve are respectively located at the two ends of the axial direction of the cylinder body, and the end of the piston away from the punch can be slidably inserted into the second support sleeve.

[0014] As an optional implementation, the cross section of the elastic sealing ring is circular or elliptical.

[0015] As an optional embodiment, the inner wall of the cylinder body has a third annular groove and a fourth annular groove, and the third annular groove and the fourth annular groove are both located between the first support sleeve and the second support sleeve. A second hydraulic oil chamber is formed between the third annular groove and the outer wall of the piston, and a third hydraulic oil chamber is formed between the fourth annular groove and the outer wall of the piston. The second hydraulic oil chamber and the third hydraulic oil chamber are configured to alternately introduce pressurized oil to push the piston to perform reciprocating linear motion along the cylinder body through the pressure difference formed at the second hydraulic oil chamber and the third hydraulic oil chamber.

[0016] As an optional implementation, it also includes a control valve, which is connected to the second hydraulic oil chamber and the third hydraulic oil chamber, and is used to control the pressure oil to enter the second hydraulic oil chamber or the third hydraulic oil chamber.

[0017] In a second aspect, the utility model further provides a rock drill, comprising the hydraulic impactor in any one of the first aspect.

[0018] The hydraulic impactor provided by the utility model comprises a cylinder body, a piston, a punch, a first support sleeve and an elastic sealing ring. The piston is movably arranged in the cylinder body, the punch is arranged at one end of the cylinder body, the piston is configured to make reciprocating linear sliding along the axial direction of the cylinder body to apply impulse to the punch, and the punch is used to perform impact operation under the action of the impulse of the piston; the first support sleeve is sleeved on the inner side of the cylinder body, the end of the piston facing the punch is slidably arranged in the first support sleeve, an annular mounting groove is surrounded between the inner wall of the cylinder body and the outer wall of the first support sleeve, the elastic sealing ring is installed in the annular mounting groove, and the elastic sealing ring is in a compressed state along the radial direction of the cylinder body. The hydraulic impactor provided by the utility model forms an annular installation groove between the inner wall of the cylinder body and the outer wall of the first support sleeve, installs an elastic sealing ring in the annular installation groove, and makes the elastic sealing ring in a compressed state along the radial direction of the cylinder body, thereby forming a radial seal between the cylinder body and the first support sleeve. When the piston performs reciprocating linear motion in the cylinder body, the first support sleeve is easy to vibrate along the front and rear directions of the cylinder body, which may cause the elastic sealing ring to deform along the axial direction of the cylinder body. Since the elastic sealing ring is in a compressed state in the radial direction in advance, when the elastic sealing ring is deformed along the axial direction, it is actually restoring its original state, thereby avoiding the elastic sealing ring from being subjected to excessive unidirectional stress during the movement of the piston, preventing the elastic sealing ring from failing to seal due to excessive deformation, and improving the sealing performance of the hydraulic impactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic diagram of the structure of a hydraulic impactor provided in an embodiment of the utility model;

[0021] Figure 2 A first partial cross-sectional view of a hydraulic impactor provided by an embodiment of the utility model;

[0022] Figure 3 A second partial cross-sectional view of a hydraulic impactor provided by an embodiment of the utility model;

[0023] Figure 4 for Figure 3 An enlarged view of the elastic sealing ring in FIG.

[0024] Figure 5 A schematic structural diagram of a first support sleeve in a hydraulic impactor provided in an embodiment of the utility model;

[0025] Figure 6 for Figure 5 sectional view of

[0026] Figure 7 for Figure 6 A partial enlarged view of the second annular groove.

[0027] Description of reference numerals:

[0028] 100-impactor;

[0029] 110-cylinder body;

[0030] 111 - third annular groove;

[0031] 112- fourth annular groove;

[0032] 120-piston;

[0033] 130-punch;

[0034] 140-first support sleeve;

[0035] 141-first set of bodies;

[0036] 142-second set of body;

[0037] 143-first annular groove;

[0038] 144-flow channel;

[0039] 145 - second annular groove;

[0040] 150-elastic sealing ring;

[0041] 160-buffer sleeve;

[0042] 170-first hydraulic oil chamber;

[0043] 180-Second support sleeve. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] In the application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0046] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0047] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0048] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0049] A hydraulic impactor generally includes a cylinder, a piston, a guide sleeve, an impact head and other components, wherein the guide sleeve is arranged between the piston and the cylinder, the piston is arranged to slide relative to the guide sleeve, and when the piston moves back and forth along the cylinder under the push of high-pressure oil, the front end of the moving piston hits the impact head, thereby performing blasting, drilling, hammering and other related impact operations on the target object through the impact head. However, the guide sleeve and piston of the existing hydraulic impactor are prone to sealing failure, which leads to cavitation, cavitation, wear and other problems in the guide sleeve and piston.

[0050] In view of this, the utility model provides a hydraulic impactor, including a cylinder body, a piston, a punch, a first support sleeve and an elastic sealing ring. The piston can be movably inserted into the cylinder body, the punch is arranged at one end of the cylinder body, and the piston is configured to make reciprocating linear sliding along the axial direction of the cylinder body to apply impulse to the punch, and the punch is used to perform impact operation under the action of the impulse of the piston; the first support sleeve is sleeved on the inner side of the cylinder body, and the end of the piston facing the punch can be slidably inserted into the first support sleeve, and an annular mounting groove is surrounded between the inner wall of the cylinder body and the outer wall of the first support sleeve, the elastic sealing ring is installed in the annular mounting groove, and the elastic sealing ring is in a compressed state along the radial direction of the cylinder body. When the piston makes reciprocating linear motion in the cylinder body, the first support sleeve is likely to vibrate in the front-rear direction of the cylinder body, which may cause the elastic sealing ring to deform along the axial direction of the cylinder body. Since the elastic sealing ring is in a compressed state in the radial direction beforehand, when the elastic sealing ring is deformed in the axial direction, it is actually recovering to its original state, thereby avoiding the elastic sealing ring from being subjected to excessive unidirectional stress during the movement of the piston, preventing the elastic sealing ring from failing to seal due to excessive deformation, and improving the sealing performance of the hydraulic impactor.

[0051] Figure 1 A schematic diagram of the structure of a hydraulic impactor provided in an embodiment of the utility model; Figure 2 A first partial cross-sectional view of a hydraulic impactor provided by an embodiment of the utility model; Figure 3 A second partial cross-sectional view of a hydraulic impactor provided by an embodiment of the utility model; Figure 4 for Figure 3 An enlarged view of the elastic sealing ring in FIG. Figure 5 A schematic structural diagram of a first support sleeve in a hydraulic impactor provided in an embodiment of the utility model; Figure 6 for Figure 5 sectional view of Figure 7 for Figure 6 A partial enlarged view of the second annular groove.

[0052] You can refer to Figures 1 to 7The embodiment of the utility model provides a hydraulic impactor 100, including a cylinder 110, a piston 120, a punch 130, a first support sleeve 140 and an elastic sealing ring 150. The piston 120 can be movably inserted into the cylinder 110, and the punch 130 is arranged at one end of the cylinder 110. The piston 120 is configured to slide back and forth linearly along the axial direction of the cylinder 110 to apply an impulse to the punch 130. The punch 130 is used to perform an impact operation under the action of the impulse of the piston 120; the first support sleeve 140 is sleeved on the inner side of the cylinder 110, and one end of the piston 120 facing the punch 130 can be slidably inserted into the first support sleeve 140. An annular mounting groove is formed between the inner wall of the cylinder 110 and the outer wall of the first support sleeve 140. The elastic sealing ring 150 is installed in the annular mounting groove, and the elastic sealing ring 150 is in a compressed state along the radial direction of the cylinder 110.

[0053] Among them, the first support sleeve 140 can be sleeved on the front end of the cylinder body 110. On the one hand, it is used to prevent direct friction between the piston 120 and the cylinder body 110 and protect the cylinder body 110. On the other hand, the first middle support sleeve can better guide the movement trajectory of the piston 120, so that the piston 120 can perform stable reciprocating linear motion.

[0054] The cross-section of the elastic sealing ring 150 may be circular or elliptical, thereby improving the elastic sealing ring 150's ability to withstand stress and enabling the local stress to be better distributed when the elastic sealing ring 150 is deformed, thereby increasing the service life of the elastic sealing ring 150.

[0055] It can be understood that when the piston 120 makes reciprocating linear motion in the cylinder body 110, friction is generated between the first support sleeve 140 and the piston 120, and the first support sleeve 140 may vibrate in the front-to-back direction of the cylinder body 110, thereby generating an axial force (friction force or extrusion force) on the first sealing ring, thereby causing the elastic sealing ring 150 to deform along the axial direction of the cylinder body 110. Since the elastic sealing ring 150 is in a radially compressed state in advance, when the elastic sealing ring 150 is deformed in the axial direction, it is actually restoring its original state, thereby avoiding the elastic sealing ring 150 from being subjected to excessive unidirectional stress during the movement of the piston 120, preventing the elastic sealing ring 150 from failing to seal due to excessive deformation, and improving the sealing performance of the hydraulic impactor 100.

[0056] like Figure 5 and Figure 6As shown, in the above embodiment, the first support sleeve 140 may include a first sleeve body 141 and a second sleeve body 142 integrally formed along its own axial direction, the diameter of the second sleeve body 142 is larger than the diameter of the first sleeve body 141, the outer peripheral surface of the first sleeve body 141, the end surface of the second sleeve body 142 and the inner wall of the cylinder body 110 are jointly arranged to form an annular mounting groove, and the end surface of the cylinder body 110 is in contact with the end surface of the second sleeve body 142. It can be understood that when the first support sleeve 140 vibrates along the axial direction of the cylinder body 110, the end surface of the second sleeve body 142 may axially squeeze the elastic sealing ring 150, which may cause the elastic sealing ring 150 to deform in the axial direction, which is opposite to the deformation direction of the elastic sealing ring 150 itself (when the piston 120 is not moving), so that the force on the elastic sealing ring 150 tends to be balanced, the local stress on the elastic sealing ring 150 is reduced, and the reliability of the elastic sealing ring 150 is improved.

[0057] In the above embodiment, a buffer sleeve 160 may also be included. The buffer sleeve 160 is sleeved outside the first support sleeve 140, and one end of the buffer sleeve 160 is connected to the end of the cylinder body 110. The buffer sleeve 160, the outer peripheral surface of the second sleeve 142 and the end surface of the cylinder body 110 are surrounded by a first hydraulic oil chamber 170, and the first hydraulic oil chamber 170 is connected to the oil return pipe of the impactor 100. It can be understood that the first hydraulic oil chamber 170 stores low-pressure oil. When the piston 120 retracts backward, the space at the front end of the piston 120 is generally in a negative pressure state. The oil in the space flows back toward the moving direction of the piston 120, which may cause the lubrication effect of the space to decrease. The oil storage chamber is set here, and the oil in the oil storage chamber (the first hydraulic oil chamber 170) can be used to supplement the oil in the space at the front end of the piston 120.

[0058] In the above embodiment, the first support sleeve 140 may further include a first annular groove 143 and a flow channel 144. The first annular groove 143 is located on the inner wall of the first support sleeve 140. The flow channel 144 is opened on the second sleeve body 142. Both ends of the flow channel 144 are respectively connected to the first annular groove 143 and the first hydraulic oil chamber 170, so that the oil in the first hydraulic oil chamber 170 is sent into the first annular groove 143 through the flow channel 144 when the piston 120 retracts. It can be understood that when the piston 120 retracts backward, the oil at the sliding connection between the front end of the piston 120 and the first support sleeve 140 will flow toward the rear (the direction of retraction of the piston 120) under negative pressure, thereby causing the lubrication effect between the first support sleeve 140 and the piston 120 to decrease. At this time, the oil in the first hydraulic oil chamber 170 can flow into the first annular groove 143 via the flow channel 144, thereby replenishing the oil between the first support sleeve 140 and the front end of the piston 120, thereby improving the lubrication effect and sealing effect between the first support sleeve 140 and the piston 120.

[0059] In the above embodiment, the inner side of the first support sleeve 140 may have a plurality of second annular grooves 145 spaced apart along the axial direction. The second annular grooves 145 may store oil, thereby improving the lubrication effect between the piston 120 and the first support sleeve 140, reducing the wear between the piston 120 and the first support sleeve 140, and increasing the service life of the two.

[0060] In the above embodiment, a second support sleeve 180 may also be included. The second support sleeve 180 is sleeved on the inner side of the cylinder body 110. The second support sleeve 180 and the first support sleeve 140 are respectively located at the two ends of the axial direction of the cylinder body 110, and the end of the piston 120 away from the punch 130 can be slidably penetrated in the second support sleeve 180. The second support sleeve 180 has a similar function to the first support sleeve 140, which will not be described here. An oil replenishing structure similar to that on the first support sleeve 140 may also be provided on the second support sleeve 180. The first support sleeve 140 and the second support sleeve 180 at the front and rear ends can provide more comprehensive protection for the cylinder body 110.

[0061] In the above embodiment, the inner wall of the cylinder body 110 has a third annular groove 111 and a fourth annular groove 112, and the third annular groove 111 and the fourth annular groove 112 are both located between the first support sleeve 140 and the second support sleeve 180. A second hydraulic oil chamber is formed between the third annular groove 111 and the outer wall of the piston 120, and a third hydraulic oil chamber is formed between the fourth annular groove 112 and the outer wall of the piston 120. The second hydraulic oil chamber and the third hydraulic oil chamber are configured to alternately introduce pressurized oil so as to push the piston 120 to perform reciprocating linear motion along the cylinder body 110 through the pressure difference formed at the second hydraulic oil chamber and the third hydraulic oil chamber.

[0062] In the above embodiment, a control valve is further included, which is connected to the second hydraulic oil chamber and the third hydraulic oil chamber, and is used to control the pressure oil to enter the second hydraulic oil chamber or the third hydraulic oil chamber. The control valve can be a solenoid reversing valve, which can be connected to an external hydraulic pump, so as to control the high-pressure oil (represented by pressure oil in this article) to enter the third hydraulic oil chamber or the fourth hydraulic oil chamber. For example, when high-pressure oil is introduced into the third hydraulic oil chamber, the piston 120 can be pushed backward (the piston 120 retracts), and when high-pressure oil is introduced into the fourth hydraulic oil chamber, the piston 120 is pushed forward, so that the reciprocating motion of the piston 120 is realized by switching the solenoid reversing valve.

[0063] The hydraulic impactor 100 provided in the embodiment of the utility model includes a cylinder 110, a piston 120, a punch 130, a first support sleeve 140 and an elastic sealing ring 150. The piston 120 can be movably inserted into the cylinder 110, and the punch 130 is arranged at one end of the cylinder 110. The piston 120 is configured to slide back and forth linearly along the axial direction of the cylinder 110 to apply an impulse to the punch 130. The punch 130 is used to perform an impact operation under the action of the impulse of the piston 120; the first support sleeve 140 is sleeved on the inner side of the cylinder 110, and one end of the piston 120 facing the punch 130 can be slidably inserted into the first support sleeve 140. An annular mounting groove is formed between the inner wall of the cylinder 110 and the outer wall of the first support sleeve 140. The elastic sealing ring 150 is installed in the annular mounting groove, and the elastic sealing ring 150 is in a compressed state along the radial direction of the cylinder 110.

[0064] The hydraulic impactor 100 provided by the embodiment of the utility model is provided with an annular installation groove between the inner wall of the cylinder body 110 and the outer wall of the first support sleeve 140, and an elastic sealing ring 150 is installed in the annular installation groove, and the elastic sealing ring 150 is compressed in the radial direction of the cylinder body 110, so as to form a radial seal between the cylinder body 110 and the first support sleeve 140. When the piston 120 performs reciprocating linear motion in the cylinder body 110, the first support sleeve 140 is easy to vibrate in the front-rear direction of the cylinder body 110, which may cause the elastic sealing ring 150 to deform in the axial direction of the cylinder body 110. Since the elastic sealing ring 150 is in a compressed state in the radial direction in advance, when the elastic sealing ring 150 is deformed in the axial direction, it is actually restoring its original state, thereby avoiding the elastic sealing ring 150 from being subjected to excessive unidirectional stress during the movement of the piston 120, preventing the elastic sealing ring 150 from failing to seal due to excessive deformation, and improving the sealing performance of the hydraulic impactor 100.

[0065] In addition, the embodiment of the utility model further provides a rock drill, comprising the hydraulic impactor 100 in any one of the above embodiments. The rock drill uses the hydraulic impactor 100 in the above embodiment as a driving force, and its service life and reliability are improved.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A hydraulic impactor, It is characterized in that The invention comprises a cylinder body, a piston, a punch, a first support sleeve and an elastic sealing ring, wherein the piston is movably arranged in the cylinder body, the punch is arranged at one end of the cylinder body, the piston is configured to slide back and forth linearly along the axial direction of the cylinder body to apply an impulse to the punch, and the punch is used to perform an impact operation under the action of the impulse of the piston; The first support sleeve is sleeved on the inner side of the cylinder body, and the end of the piston facing the punch can be slidably inserted into the first support sleeve. An annular mounting groove is formed between the inner wall of the cylinder body and the outer wall of the first support sleeve. The elastic sealing ring is installed in the annular mounting groove, and the elastic sealing ring is in a compressed state along the radial direction of the cylinder body.

2. The hydraulic impactor according to claim 1, It is characterized in that The first support sleeve includes a first sleeve body and a second sleeve body integrally formed along its own axial direction, the diameter of the second sleeve body is larger than the diameter of the first sleeve body, the outer peripheral surface of the first sleeve body, the end surface of the second sleeve body and the inner wall of the cylinder body are jointly arranged to form the annular mounting groove, and the end surface of the cylinder body is in contact with the end surface of the second sleeve body.

3. The hydraulic impactor according to claim 2, It is characterized in that It also includes a buffer sleeve, which is arranged outside the first support sleeve, and one end of the buffer sleeve is connected to the end of the cylinder body. The buffer sleeve, the outer peripheral surface of the second sleeve and the end surface of the cylinder body form a first hydraulic oil chamber, and the first hydraulic oil chamber is connected to the return oil pipe of the impactor.

4. The hydraulic impactor according to claim 3, It is characterized in that The first support sleeve also includes a first annular groove and a flow channel, the first annular groove is located on the inner wall of the first support sleeve, the flow channel is opened on the second sleeve body, and the two ends of the flow channel are respectively connected to the first annular groove and the first hydraulic oil chamber, so that when the piston retracts, the oil in the first hydraulic oil chamber is sent into the first annular groove through the flow channel.

5. The hydraulic impactor according to claim 4, It is characterized in that The inner side of the first support sleeve has a plurality of second annular grooves spaced apart in the axial direction.

6. The hydraulic impactor according to claim 5, It is characterized in that It also includes a second support sleeve, which is sleeved on the inner side of the cylinder body. The second support sleeve and the first support sleeve are respectively located at the two ends of the axial direction of the cylinder body, and the end of the piston away from the punch can be slidably inserted into the second support sleeve.

7. The hydraulic impactor according to claim 6, It is characterized in that The cross section of the elastic sealing ring is circular or elliptical.

8. The hydraulic impactor according to claim 7, It is characterized in that The inner wall of the cylinder body has a third annular groove and a fourth annular groove, and the third annular groove and the fourth annular groove are both located between the first support sleeve and the second support sleeve. A second hydraulic oil chamber is formed between the third annular groove and the outer wall of the piston, and a third hydraulic oil chamber is formed between the fourth annular groove and the outer wall of the piston. The second hydraulic oil chamber and the third hydraulic oil chamber are configured to alternately introduce pressurized oil so as to push the piston to perform reciprocating linear motion along the cylinder body through the pressure difference formed at the second hydraulic oil chamber and the third hydraulic oil chamber.

9. The hydraulic impactor according to claim 8, It is characterized in that It also includes a control valve, which is connected to the second hydraulic oil chamber and the third hydraulic oil chamber, and is used to control the pressure oil to enter the second hydraulic oil chamber or the third hydraulic oil chamber.

10. A rock drill, It is characterized in that The hydraulic impactor comprises the hydraulic impactor as described in any one of claims 1 to 9.

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