Pressure-bearing pad and impactor

Abstract

The pressure-bearing pad comprises a first wear-resisting part, a second wear-resisting part, a third wear-resisting part and a third wear-resisting part, and a mounting shaft is arranged on one side of the first wear-resisting part; the buffer piece is arranged on the outer side of the mounting shaft in a sleeving manner; the second wear-resistant part is arranged on one side, far away from the first wear-resistant part, of the buffer part; a first limiting piece is arranged on the outer surface of the mounting shaft, a second limiting piece is arranged on the inner surface of the second wear-resisting piece, the second limiting piece is arranged on the side, close to the first wear-resisting piece, of the first limiting piece, and the second limiting piece and the first limiting piece are used in a matched mode; and the limiting part is used for limiting the axial displacement between the second wear-resistant part and the first wear-resistant part. Compared with the prior art, the pressure bearing pad and the impactor can replace an existing rubber pad, and the service life of the impactor is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of impactors, and more specifically, to a pressure pad and an impactor. Background Art

[0002] With the development of industry, various infrastructure projects are constantly advancing. As drilling equipment, down-the-hole impactors are widely used in blasting projects in the construction of mines, hydropower stations, ports, roads, tunnels, etc., for drilling blasting holes, etc. Pneumatic down-the-hole impactors use high-pressure air as a power source to drive the piston in the impactor to reciprocate at high speed and high frequency, so that the piston obtains enough energy to impact the drill bit for drilling operations. The impact force acts on the drill bit in the form of stress waves, generating huge impact energy in a very short time, which can effectively break the rock and quickly form holes to achieve the purpose of rock drilling.

[0003] In the prior art down-the-hole impactor, high-pressure gas enters the high-pressure channel in the joint, and the high-pressure air opens the check valve and then flows to the piston through the valve seat, so that a pressure difference is generated at both ends of the piston, causing the piston to move up and down continuously. When the piston strikes the drill bit downward, the drill bit breaks the rock due to the violent impact. In the prior art, a rubber pad is often arranged between the valve seat and the joint. The cushioning effect of the rubber pad prevents the inner casing from moving in the outer casing. However, the process of the piston moving up and down is prone to cause the rubber pad to fail or even break, thereby affecting the normal use of the impactor.

[0004] Therefore, there is an urgent need for a pressure pad and an impactor that can replace the existing rubber pad and extend the service life of the impactor. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a pressure pad and an impactor, which can replace the existing rubber pad and extend the service life of the impactor.

[0006] The technical solutions provided by this application are as follows:

[0007] A pressure pad, comprising:

[0008] a first wear-resistant part, wherein a mounting shaft is provided on one side of the first wear-resistant part;

[0009] A buffer member sleeved on the outer side of the mounting shaft;

[0010] a second wear-resistant member disposed on a side of the buffer member away from the first wear-resistant member;

[0011] A first limiting member is provided on the outer surface of the installation shaft, and a second limiting member is provided on the inner surface of the second wear-resistant member. The second limiting member is disposed on a side of the first limiting member close to the first wear-resistant member. The second limiting member and the first limiting member are used in cooperation to limit and constrain the axial displacement between the second wear-resistant member and the first wear-resistant member.

[0012] Preferably, the first wear-resistant member and the second wear-resistant member are specifically detachably connected.

[0013] Preferably, the first limiting member is disposed at an end of the installation shaft away from the installation seat, and the distance between the front end face of the first limiting member and the installation seat is not less than the sum of the lengths of the second limiting member and the buffer member.

[0014] Preferably, the second wear-resistant member includes a main body and an installation groove. The installation groove is provided at the front end of the main body. The second limiting member is disposed on the inner surface of the installation groove, and the distance between the rear end face of the second limiting member and the bottom surface of the installation groove is not less than the length of the first limiting member.

[0015] Preferably, an external thread line is provided on the first limiting member, and an internal thread line is provided on the second limiting member. The external thread line and the internal thread line are used in cooperation.

[0016] Preferably, it further includes:

[0017] A convex block disposed outside the first limiting member;

[0018] A groove disposed on the second limiting member and used in cooperation with the convex block.

[0019] Preferably, both the first wear-resistant member and the second wear-resistant member are made of steel material;

[0020] The buffer member is made of rubber material.

[0021] A percussion drill, comprising:

[0022] An outer sleeve, on the inner wall of which a limiting step is provided;

[0023] An inner sleeve coaxially sleeved inside the outer sleeve, on which a convex block cooperating with the limiting step is provided;

[0024] A gas distribution seat sleeved inside the outer sleeve, the front end face of which abuts against the rear end face of the inner sleeve;

[0025] A joint fixedly connected to the rear end of the outer sleeve, inside which a high-pressure air passage is provided, and a check valve assembly for opening and closing the high-pressure air passage is provided on the gas distribution seat;

[0026] The pressure-bearing gasket as described in any one of the above, disposed between the air distribution seat and the joint.

[0027] Preferably, it further includes:

[0028] A guide shaft disposed at the rear end of the air distribution seat and extending towards the joint, and the pressure-bearing gasket is sleeved outside the guide shaft.

[0029] Preferably, the check valve assembly includes:

[0030] An installation groove disposed in the guide shaft;

[0031] A valve stem sleeved in the installation groove and slidably connected to the installation groove. A forming surface for cooperating with the high-pressure air passage is provided at the rear end of the valve stem. The forming surface has a closed state in which it abuts against the inner wall of the high-pressure air passage and an open state in which it is separated from the inner wall of the high-pressure air passage;

[0032] An elastic member disposed between the valve stem and the air distribution seat. A first positioning groove for cooperating with the front end of the elastic member is provided at the bottom of the installation groove, and a second positioning groove for cooperating with the rear end of the elastic member is provided in the valve stem.

[0033] For the pressure-bearing gasket provided by the present utility model, firstly, due to the provision of a first wear-resistant member, a buffer member, and a second wear-resistant member. Among them, an installation shaft is provided on one side of the first wear-resistant member, the buffer member is sleeved outside the installation shaft, and the second wear-resistant member is provided on the side of the buffer member away from the first wear-resistant member. The buffer member is clamped by the first wear-resistant member and the second wear-resistant member. The first wear-resistant member abuts against the air distribution seat, and the second wear-resistant member abuts against the joint. On the one hand, through the buffering action of the buffer member, it is prevented that the inner sleeve moves chaotically within the outer sleeve; on the other hand, the first wear-resistant member and the second wear-resistant member are provided on both sides of the buffer member to protect the buffer member and avoid the buffer member from being worn, failing, or even breaking, thereby extending the service life of the pressure-bearing gasket. Secondly, in order to connect the first wear-resistant member and the second wear-resistant member, a first limiting member and a second limiting member are also provided. The first limiting member is provided on the outer surface of the installation shaft, the second limiting member is provided on the inner surface of the second wear-resistant member, and the second limiting member is provided on the side of the first limiting member close to the first wear-resistant member. By the cooperation of the first limiting member and the second limiting member, the axial displacement of the second wear-resistant member and the first wear-resistant member is restricted, avoiding the separation of the first wear-resistant member and the second wear-resistant member, and the first wear-resistant member and the second wear-resistant member clamp the buffer member. It can be seen that, compared with the prior art, the pressure-bearing gasket in the embodiment of the present utility model can replace the existing rubber gasket and extend the service life of the impactor.

[0034] The present utility model further provides an impactor, which includes an outer sleeve; a joint connected to the front end of the outer sleeve, and a high-pressure air passage is arranged in the joint; a gas distribution seat sleeved in the outer sleeve and fixedly connected to the outer sleeve, and a check valve assembly is arranged on the gas distribution seat, and the check valve assembly is used to open and close the high-pressure air passage; a pressure-bearing pad arranged between the gas distribution seat and the joint, which can also achieve the technical effect of prolonging the service life of the impactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 It is a schematic structural diagram of a pressure-bearing pad provided by an embodiment of the present utility model;

[0037] Figure 2 It is a first exploded view of a pressure-bearing pad provided by an embodiment of the present utility model;

[0038] Figure 3 It is a second exploded view of a pressure-bearing pad provided by an embodiment of the present utility model;

[0039] Figure 4 It is a schematic structural diagram of an impactor provided by an embodiment of the present utility model.

[0040] Reference numerals: 1, first wear-resistant member; 2, mounting shaft; 3, buffer member; 4, second wear-resistant member; 5, first limiting member; 6, second limiting member; 7, convex block; 8, groove;

[0041] 10, outer sleeve; 20, inner sleeve; 30, gas distribution seat; 40, joint; 51, valve rod; 52, forming surface; 53, elastic member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] In order to enable those skilled in the art to better understand the technical solutions in the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0044] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0045] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" and "several" is two or more, unless otherwise specifically defined.

[0046] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions for the implementation of the present application. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the efficacy that the present application can produce and the purpose that can be achieved, should still fall within the scope covered by the technical content disclosed in the present application.

[0047] The embodiments of the present utility model are written in a progressive manner.

[0048] As Figures 1 to 3 shown, the embodiments of the present utility model provide a pressure-bearing pad, including: a first wear-resistant member 1, on one side of the first wear-resistant member 1 there is an installation shaft 2; a buffer member 3 sleeved on the outer side of the installation shaft 2; a second wear-resistant member 4 disposed on the side of the buffer member 3 away from the first wear-resistant member 1; on the outer surface of the installation shaft 2 there is a first limiting member 5, on the inner surface of the second wear-resistant member 4 there is a second limiting member 6, the second limiting member 6 is disposed on the side of the first limiting member 5 close to the first wear-resistant member 1, and the second limiting member 6 and the first limiting member 5 are used in cooperation to limit and restrain the axial displacement between the second wear-resistant member 4 and the first wear-resistant member 1.

[0049] The impactor includes an outer sleeve 10, a connector, a gas distribution seat, a piston and a drill bit. Among them, both ends of the outer sleeve 10 are respectively connected to the connector and the drill bit. The inner sleeve is coaxially arranged inside the outer sleeve. The inner sleeve is sleeved on the front end of the gas distribution seat. A pressure-bearing pad is arranged between the rear end of the gas distribution seat and the connector. The piston is movably coaxially sleeved inside the inner sleeve and divides the outer sleeve into a front air chamber and a rear air chamber. Under the action of the air pressure difference between the front air chamber and the rear air chamber, the piston is pushed to reciprocate inside the inner sleeve. Since the axial position of the inner sleeve is positioned by the positioning step on the inner side of the gas distribution seat and the outer sleeve, the current pressure-bearing pad is often made of rubber material. During the installation process of the connector, the rubber pad is pre-pressed. The rubber pad undergoes elastic deformation, and the inner sleeve is pressed tightly through the reaction force of the rubber pressure-bearing pad to prevent the inner sleeve from moving around inside the outer sleeve. However, during the continuous up-and-down movement of the piston, it is easy to cause the rubber pressure-bearing pad to fail or even break, thereby affecting the normal use of the impactor.

[0050] The pressure-bearing pad provided by the present utility model, firstly, due to the provision of a first wear-resistant member 1, a buffer member 3 and a second wear-resistant member 4. Among them, an installation shaft 2 is arranged on one side of the first wear-resistant member 1. The buffer member 3 is sleeved on the outside of the installation shaft 2. Through the installation shaft 2, the direction of deformation of the buffer member 3 can be limited and constrained to avoid the phenomenon of deviation when the buffer member 3 is deformed by force. The second wear-resistant member 4 is arranged on the side of the buffer member 3 away from the first wear-resistant member 1. The buffer member 3 is clamped by the first wear-resistant member 1 and the second wear-resistant member 4. The first wear-resistant member 1 abuts against the gas distribution seat, and the second wear-resistant member 4 abuts against the connector 40. On the one hand, through the buffering action of the buffer member 3, it is prevented that the inner sleeve 20 moves around inside the outer sleeve 10; on the other hand, the first wear-resistant member 1 and the second wear-resistant member 4 are arranged on both sides of the buffer member 3 to protect the buffer member 3 and avoid the situation of wear, failure or even breakage of the buffer member 3, thereby prolonging the service life of the pressure-bearing pad. Secondly, in order to connect the first wear-resistant member 1 and the second wear-resistant member 4, a first limiting member 5 and a second limiting member 6 are also provided. The first limiting member 5 is arranged on the outer surface of the installation shaft 2, and the second limiting member 6 is arranged on the inner surface of the second wear-resistant member 4. The second limiting member 6 is arranged on the side of the first limiting member 5 close to the first wear-resistant member 1. By using the first limiting member 5 and the second limiting member 6 in cooperation, the axial displacement of the second wear-resistant member 4 and the first wear-resistant member 1 is restricted to avoid the separation of the first wear-resistant member 1 and the second wear-resistant member 4, and the first wear-resistant member 1 and the second wear-resistant member 4 clamp the buffer member 3 tightly. It can be seen that compared with the prior art, the pressure-bearing pad in the embodiment of the present utility model can replace the existing rubber pad and prolong the service life of the impactor.

[0051] Furthermore, as one of the implementation manners, the first wear-resistant member 1 and the second wear-resistant member 4 in the embodiment of the present utility model are specifically detachably connected. With such a setting, when the first wear-resistant member 1, the second wear-resistant member 4 or the buffer member 3 is worn, it can be replaced in time.

[0052] In the above structure, as one of the implementation manners, the first limiting member 5 in the embodiment of the present utility model is arranged at one end of the mounting shaft 2 away from the mounting seat, and the distance between the front end face of the first limiting member 5 and the mounting seat is not less than the sum of the lengths of the second limiting member 6 and the buffer member 3. That is to say, there is relative sliding between the first wear-resistant member 1 and the second wear-resistant member 4. When the joint 40 is installed on the outer sleeve 10, the second wear-resistant member 4 moves towards the first wear-resistant member 1, pre-compresses the buffer member 3, the buffer member 3 generates elastic deformation, and the buffer member 3 generates an elastic reset acting force to press the inner sleeve 20 tightly.

[0053] Furthermore, as one of the implementation manners, the second wear-resistant member 4 includes a body and a mounting groove. The mounting groove is arranged at the front end of the body, the second limiting member 6 is arranged on the inner surface of the mounting groove, and the distance between the rear end face of the second limiting member 6 and the front end of the body is not less than the length of the first limiting member 5, providing a moving space for the axial displacement between the first wear-resistant member 1 and the second wear-resistant member 4.

[0054] More specifically, the first limiting member 5 is arranged on the outer surface of the mounting shaft 2 and protrudes in the axial direction away from the mounting shaft 2; the second limiting member 6 is arranged on the inner surface of the mounting groove and extends in the axial direction close to the mounting groove. Through the first limiting member 5 and the second limiting member 6, the axial position relationship between the first wear-resistant member 1 and the second wear-resistant member 4 is restricted.

[0055] Furthermore, the first limiting member 5 and the second limiting member 6 cooperate to prevent the first wear-resistant member 1 and the second wear-resistant member 4 from separating. As one of the specific implementation manners, as shown in Figure 2 As shown, an external thread is provided on the first limiting member 5 in the embodiment of the present utility model, and an internal thread is provided on the second limiting member 6. The internal thread and the external thread are used in cooperation to make the first wear-resistant member 1 and the second wear-resistant member 4 detachable. Furthermore, in the use state, the first limiting member 5 is arranged between the second limiting member 6 and the bottom of the mounting groove, the second limiting member 6 is located between the first limiting member 5 and the elastic member 53, and is limited by the internal thread and the external thread.

[0056] As another specific implementation manner, as shown in Figure 3 As shown, the pressure-bearing pad in the embodiment of the present utility model further includes a convex block 7 and a groove 8. Among them, the convex block 7 is arranged on the outside of the first limiting member 5, the groove 8 is arranged on the second limiting member 6, and the convex block 7 and the groove 8 are used in cooperation. During assembly, the convex block 7 is passed through the groove 8 and rotated by a preset angle so that the convex block 7 and the groove 8 are staggered. In this way, the first limiting member 5 restricts the axial displacement of the second limiting member 6. When disassembly is required, the first limiting member 5 and the second limiting member 6 are rotated relative to each other so that the convex block 7 can be withdrawn from the groove 8.

[0057] In the above structure, as one of the implementation modes, the first wear-resistant part 1 and the second wear-resistant part 4 in the embodiment of the utility model are both made of steel material, and the buffer part 3 is made of rubber material.

[0058] Please Figure 4 As shown, the utility model also provides an impactor, including an outer sleeve 10, an inner sleeve 20 is arranged in the outer sleeve 10; a joint 40 connected to the front end of the outer sleeve 10, a high-pressure airway is arranged in the joint 40; a gas distribution seat 30 arranged in the outer sleeve 10 and abutting against the rear end surface of the inner sleeve 20, a check valve assembly is arranged on the gas distribution seat 30, and the check valve assembly is used to open and close the high-pressure airway; a pressure pad is arranged between the gas distribution seat 30 and the joint 40, and the inner sleeve 20 is pressed tightly by the pressure pad between the gas distribution seat 30 and the joint 40 to prevent the inner sleeve 20 from moving inside the outer sleeve 10. The pressure pad is the above-mentioned pressure pad, which is not easy to be damaged and has a longer service life.

[0059] Furthermore, as one of the implementation modes, the impactor in the embodiment of the utility model also includes a guide shaft, wherein the guide shaft is arranged at the rear end of the gas distribution seat 30, and the guide shaft extends from the gas distribution seat 30 toward the direction of the joint 40, and the pressure pad is sleeved on the outer side of the guide shaft, and the guide shaft guides the axial movement of the pressure pad.

[0060] Furthermore, in the above structure, as one of the preferred embodiments, the check valve assembly in the embodiment of the utility model includes: a mounting groove arranged at the rear end of the guide shaft; a valve stem 51 which is sleeved in the mounting groove and slidably connected with the mounting groove, the rear end of the valve stem 51 is provided with a molding surface 52 used in conjunction with the high-pressure airway, the molding surface 52 has a closed state abutting against the inner wall of the high-pressure airway and an open state separated from the inner wall of the high-pressure airway; an elastic member 53 arranged between the valve stem 51 and the valve seat 30, the bottom of the mounting groove is provided with a first positioning groove used in conjunction with the front end of the elastic member 53, and the valve stem 51 is provided with a second positioning groove used in conjunction with the rear end of the elastic member 53. By providing the first positioning groove and the second positioning groove to position the two ends of the elastic member 53, on the one hand, it is possible to prevent the outer edge of the elastic member 53 from being worn, failing, and breaking, and on the other hand, it is possible to guide the spring and prevent the spring from swinging.

[0061] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pressure-bearing pad, characterized in that, Comprising: A first wear-resistant member (1), on one side of which there is a mounting shaft (2); A buffer member (3) sleeved on the outer side of the mounting shaft (2); A second wear-resistant member (4) arranged on the side of the buffer member (3) away from the first wear-resistant member (1); On the outer surface of the mounting shaft (2), there is a first limiting member (5), and on the inner surface of the second wear-resistant member (4), there is a second limiting member (6). The second limiting member (6) is arranged on the side of the first limiting member (5) close to the first wear-resistant member (1). The second limiting member (6) and the first limiting member (5) are used in cooperation to restrict the axial displacement between the second wear-resistant member (4) and the first wear-resistant member (1).

2. The pressure-bearing pad according to claim 1, wherein: Between the first wear-resistant member (1) and the second wear-resistant member (4) is specifically a detachable connection.

3. The pressure-bearing pad according to claim 2, wherein: The first limiting member (5) is arranged at the end of the mounting shaft (2) away from the first wear-resistant member (1), and the distance between the front end face of the first limiting member (5) and the first wear-resistant member (1) is not less than the sum of the lengths of the second limiting member (6) and the buffer member (3).

4. The pressure-bearing pad according to claim 3, wherein: The second wear-resistant member (4) includes a body and a mounting groove. The mounting groove is arranged at the front end of the body, and the second limiting member (6) is arranged on the inner surface of the mounting groove. The distance between the rear end face of the second limiting member (6) and the bottom surface of the mounting groove is not less than the length of the first limiting member (5).

5. The pressure-bearing pad according to claim 4, wherein: On the first limiting member (5), there is an external thread line, and on the second limiting member (6), there is an internal thread line. The external thread line and the internal thread line are used in cooperation.

6. The pressure-bearing pad according to claim 4, wherein: Further comprising: A convex block (7) arranged on the outer side of the first limiting member (5); A groove (8) arranged on the second limiting member (6) and used in cooperation with the convex block (7).

7. The pressure-bearing pad according to any one of claims 1 to 6, wherein: Both the first wear-resistant member (1) and the second wear-resistant member (4) are made of steel material; The buffer member (3) is made of rubber material.

8. An impactor, characterized in that, Comprising: An outer sleeve (10), on the inner wall of which there is a limiting step; An inner sleeve (20) coaxially sleeved in the outer sleeve (10), on which there is a convex block cooperating with the limiting step; A gas distribution seat (30) sleeved in the outer sleeve (10), the front end face of the gas distribution seat (30) abuts against the rear end face of the inner sleeve (20); A joint (40) fixedly connected to the rear end of the outer sleeve (10), in which there is a high-pressure air passage, and on the gas distribution seat (30), there is a check valve assembly for opening and closing the high-pressure air passage; The pressure-bearing pad as claimed in any one of claims 1 to 7, disposed between the gas distribution seat (30) and the joint (40).

9. The impactor according to claim 8, wherein further comprising: a guide shaft (41) disposed at the rear end of the gas distribution seat (30) and extending in the direction of the joint (40), and the pressure-bearing pad is sleeved outside the guide shaft (41).

10. The impactor according to claim 9, wherein the check valve assembly includes: a mounting groove disposed in the guide shaft; a valve stem (51) sleeved in the mounting groove and slidably connected to the mounting groove, a forming surface (52) cooperating with the high-pressure air passage is provided at the rear end of the valve stem (51), and the forming surface (52) has a closed state in which it abuts against the inner wall of the high-pressure air passage and an open state in which they are separated; an elastic member (53) disposed between the valve stem (51) and the mounting groove, a first positioning groove cooperating with the front end of the elastic member is provided at the bottom of the mounting groove, and a second positioning groove cooperating with the rear end of the elastic member is provided in the valve stem.

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