Buffer piston assembly special for pneumatic rock drill

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By designing the internal support, cam and groove structure of the buffer piston assembly, the problem of severe wear of the buffer piston of the pneumatic rock drill is solved, and the sealing sleeve and piston can be quickly disassembled and replaced, which increases the service life and reduces maintenance costs.

CN223359576UActive Publication Date: 2025-09-19YANCHENG LEIWEIAO ENG MACHINERY

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Patent Information

Application Number: CN202422695811.X
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-11-05
Publication Date: 2025-09-19
Estimated Expiration: 2034-11-05

AI Technical Summary

Technical Problem

The buffer piston of the pneumatic rock drill is severely worn after long-term use, resulting in seal pressure relief and piston friction, which increases maintenance costs and is inconvenient to disassemble and replace, affecting the buffer effect.

Method used

A special buffer piston assembly for pneumatic rock drills is designed, including a buffer piston middle frame, first and second sealing sleeves, a piston outer sleeve and a piston inner sleeve. The sealing sleeve can be quickly disassembled and the piston can be replaced separately through the internal support, convex and groove structures, thereby improving the service life.

Benefits of technology

The sealing sleeve and the piston can be quickly disassembled and repaired, and the replacement is convenient, which prolongs the service life of the buffer piston assembly and reduces the maintenance cost.

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Abstract

The utility model discloses a special buffering piston assembly for a pneumatic rock drill, and particularly relates to the technical field of buffering piston assemblies, which comprises a buffering piston middle frame, a first sealing sleeve is arranged in the middle of the outer side of the buffering piston middle frame, and a second sealing sleeve is arranged at one end of the outer side of the buffering piston middle frame. The outer side of the buffer piston middle frame between the first sealing sleeve and the second sealing sleeve is movably sleeved with a piston outer sleeve, and the inner side of the buffer piston middle frame is provided with a piston inner sleeve; a first inner support is fixedly clamped in the middle of the first sealing sleeve, an inner end seal is integrally formed on the side, away from the second sealing sleeve, of the inner wall of the first sealing sleeve, the inner end seal makes contact with the end of the first inner support, and a second inner support is fixedly clamped in the middle of the second sealing sleeve. And the first sealing sleeve and the second sealing sleeve can be quickly disassembled, overhauled and replaced, and the service life of the whole buffer piston assembly is prolonged.

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Description

Technical Field

[0001] The utility model relates to the technical field of buffer piston components, in particular to a special buffer piston component for a pneumatic rock drill. Background Art

[0002] A pneumatic rock drill is a mechanical device that uses compressed air as a power source. Its main function is to crush rocks through high-speed impact and cutting action. It has the characteristics of high efficiency and strong applicability. Pneumatic rock drills are usually composed of an air motor, piston, chisel head, etc. and are widely used in mining, construction, tunnel excavation and other fields.

[0003] The buffer piston of a pneumatic rock drill makes axial movement inside the rock drill, and two seals will be worn on the surface. After long-term use, the wear will be more serious. If it is not replaced in time, the buffer oil will be seriously depressurized, affecting the buffer effect, and even the buffer piston will be offside and hit the intermediate body. There will also be friction between the piston and the intermediate body, which may cause the intermediate body to be scrapped. Traditional buffer pistons are mostly one-piece molding structures. When wear occurs, they need to be replaced completely, which increases maintenance costs. Secondly, the seals are mostly fixed on the outside of the buffer piston. When the seals are worn, it is inconvenient to disassemble, replace and repair them. For this reason, we propose a buffer piston assembly specifically for pneumatic rock drills to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a special buffer piston assembly for a pneumatic rock drill to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a buffer piston assembly for a pneumatic rock drill, comprising a buffer piston middle frame, a first sealing sleeve provided at the middle portion of the outer side of the buffer piston middle frame, a second sealing sleeve provided at one end of the outer side of the buffer piston middle frame, a piston outer sleeve provided on the outer side of the buffer piston middle frame between the first and second sealing sleeves, and a piston inner sleeve provided on the inner side of the buffer piston middle frame;

[0006] The first sealing sleeve is fixedly provided with a first inner support in the middle, and an inner end seal is integrally formed on the side of the inner wall of the first sealing sleeve away from the second sealing sleeve, and the inner end seal is in contact with the end of the first inner support. The second sealing sleeve is fixedly provided with a second inner support in the middle, and a positioning ring is fixedly provided on the side of the inner wall of the piston sleeve close to the second sealing sleeve.

[0007] Preferably, a first sealing groove is provided in the middle part of the outer side of the buffer piston middle frame, the first inner support is movably sleeved on the outer side of the first sealing groove, a first latching protrusion is integrally formed on the side of the first inner support close to the second sealing sleeve, and a first latching groove corresponding to the first latching protrusion is provided on the buffer piston middle frame, and the first latching protrusion is movably snapped into the corresponding first latching groove.

[0008] Preferably, a second sealing groove corresponding to the second inner support is opened at one end of the outer side of the buffer piston middle frame, and the second inner support is movably sleeved on the outer side of the second sealing groove.

[0009] Preferably, a positioning groove corresponding to the positioning ring is provided on a side of the outer wall of the buffer piston middle frame close to the second sealing sleeve, and the positioning ring is movably engaged in the corresponding positioning groove.

[0010] Preferably, a second latching protrusion is integrally formed on the side of the positioning ring away from the second sealing sleeve, and a second latching groove corresponding to the second latching protrusion is opened on the middle frame of the buffer piston, and the second latching protrusion is movably engaged in the corresponding second latching groove.

[0011] Preferably, a third latching protrusion is integrally formed on one side of the positioning ring close to the second sealing sleeve, a third latching groove corresponding to the third latching protrusion is opened on one side of the second inner support, and the third latching protrusion is movably engaged in the corresponding third latching groove.

[0012] Preferably, the side of the second inner support away from the positioning ring movably passes through the first bolt, and the end of the first bolt movably passes through the third clamping protrusion, the positioning ring, the second clamping protrusion and the buffer piston middle frame and is threadedly installed in the first clamping protrusion.

[0013] Preferably, a plurality of positioning strips distributed in a ring array are integrally formed on the inner side of the buffer piston middle frame, and a positioning groove corresponding to the positioning strip is opened on the outer wall of the piston inner sleeve, and the positioning strip is movably connected in the corresponding positioning groove, and a second bolt is threadedly installed at one end of the piston inner sleeve, and the end of the second bolt is threadedly installed on the positioning strip.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. By providing the first inner support and the second inner support, it is convenient to disassemble the first sealing sleeve and the second sealing sleeve for quick disassembly, maintenance and replacement, thereby extending the service life of the entire buffer piston assembly.

[0016] 2. By setting up the piston outer sleeve and the piston inner sleeve, when the outer side of the buffer piston assembly is rubbed, the piston outer sleeve can be removed and replaced separately. When the inner side of the buffer piston assembly is rubbed, the piston inner sleeve can be removed and replaced separately, further increasing the service life of the entire buffer piston assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the structure of the utility model.

[0019] Figure 2 It is a schematic diagram of the connection of some structures in the utility model.

[0020] Figure 3 For this utility model Figure 2 Enlarged view of point A in the middle.

[0021] Figure 4 For this utility model Figure 2 Enlarged view of point B in the middle.

[0022] Figure 5 For this utility model Figure 2 Enlarged view of point C in the middle.

[0023] Figure 6 This is a schematic diagram of the structural connection between the buffer piston middle frame and the piston inner sleeve in the utility model.

[0024] In the figure: 1. Buffer piston middle frame; 2. First sealing sleeve; 21. First inner support; 201. Inner end seal; 211. First retaining protrusion; 2111. First retaining groove; 3. Second sealing sleeve; 31. Second inner support; 301. Third retaining groove; 4. Piston outer sleeve; 41. Positioning ring; 42. Second retaining protrusion; 421. Second retaining groove; 43. Third retaining protrusion; 5. Piston inner sleeve; 51. Positioning strip; 52. Second bolt; 501. Positioning groove; 6. First bolt; 101. First sealing groove; 102. Second sealing groove; 103. Positioning slide groove. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Example: Figure 1-6As shown, the utility model provides a buffer piston assembly for a pneumatic rock drill, comprising a buffer piston middle frame 1, a first sealing sleeve 2 is provided in the middle portion of the outer side of the buffer piston middle frame 1, a second sealing sleeve 3 is provided at one end of the outer side of the buffer piston middle frame 1, a piston outer sleeve 4 is provided on the outer side of the buffer piston middle frame 1 between the first sealing sleeve 2 and the second sealing sleeve 3, and a piston inner sleeve 5 is provided on the inner side of the buffer piston middle frame 1;

[0027] A first inner support 21 is fixedly provided in the middle of the first sealing sleeve 2, and an inner end seal 201 is integrally formed on the side of the inner wall of the first sealing sleeve 2 away from the second sealing sleeve 3. The inner end seal 201 is in contact with the end of the first inner support 21, and a second inner support 31 is fixedly provided in the middle of the second sealing sleeve 3. A positioning ring 41 is fixedly provided on the side of the inner wall of the piston sleeve 4 close to the second sealing sleeve 3.

[0028] A first sealing groove 101 is provided in the middle part of the outer side of the buffer piston middle frame 1, and the first inner support 21 is movably sleeved on the outer side of the first sealing groove 101. A first latching protrusion 211 is integrally formed on the side of the first inner support 21 close to the second sealing sleeve 3. A first latching groove 2111 corresponding to the first latching protrusion 211 is provided on the buffer piston middle frame 1. The first latching protrusion 211 is movably sleeved in the corresponding first latching groove 2111 to perform positioning sleeve connection between the first inner support 21 and the buffer piston middle frame 1, thereby facilitating the disassembly of the first inner support 21 and the rapid disassembly, inspection and replacement of the first sealing sleeve 2, thereby improving the service life of the entire buffer piston assembly.

[0029] A second sealing groove 102 corresponding to the second inner support 31 is opened at one end of the outer side of the buffer piston middle frame 1. The second inner support 31 is movably sleeved on the outer side of the second sealing groove 102. The sleeve connection of the second inner support 31 facilitates the disassembly of the second inner support 31 and the rapid disassembly, maintenance and replacement of the second sealing sleeve 3, thereby further improving the service life of the entire buffer piston assembly.

[0030] A positioning groove 103 corresponding to the positioning ring 41 is provided on the side of the outer wall of the buffer piston middle frame 1 close to the second sealing sleeve 3. The positioning ring 41 is movably engaged in the corresponding positioning groove 103 to perform the sleeve connection between the piston sleeve 4 and the positioning ring 41, which facilitates the disassembly of the piston sleeve 4. By setting the piston sleeve 4, when the outer side of the buffer piston assembly is rubbed, the piston sleeve 4 can be removed separately for replacement, thereby increasing the service life of the entire buffer piston assembly.

[0031] A second latching protrusion 42 is integrally formed on the side of the positioning ring 41 away from the second sealing sleeve 3. A second latching groove 421 corresponding to the second latching protrusion 42 is defined on the buffer piston middle frame 1. The second latching protrusion 42 is movably engaged in the corresponding second latching groove 421. A third latching protrusion 43 is integrally formed on the side of the positioning ring 41 close to the second sealing sleeve 3. A third latching groove 301 corresponding to the third latching protrusion 43 is defined on one side of the second inner support 31. The third latching protrusion 43 is movably engaged in the corresponding third latching groove 301.

[0032] The side of the second inner support 31 away from the positioning ring 41 is movable through the first bolt 6, and the end of the first bolt 6 is movable through the third clamping protrusion 43, the positioning ring 41, the second clamping protrusion 42 and the buffer piston middle frame 1 and is threadedly installed in the first clamping protrusion 211. The second inner support 31, the positioning ring 41, the buffer piston middle frame 1 and the first inner support 21 are bolted together by using the first bolt 6.

[0033] The inner side of the buffer piston middle frame 1 is integrally formed with multiple positioning strips 51 distributed in a ring array, and the outer wall of the piston inner sleeve 5 is provided with a positioning slot 501 corresponding to the positioning strip 51. The positioning strip 51 is movably engaged in the corresponding positioning slot 501, and a second bolt 52 is threadedly installed at one end of the piston inner sleeve 5, and the end of the second bolt 52 is threadedly installed on the positioning strip 51. By setting multiple positioning strips 51, the piston inner sleeve 5 is engaged, and when the inner side of the buffer piston assembly is rubbed, it is convenient to disassemble the piston inner sleeve 5 for replacement.

[0034] Working principle: When in use, the piston sleeve 4 is movably sleeved on the outside of the buffer piston middle frame 1, the positioning ring 41 is movably engaged in the corresponding positioning groove 103, and the second clamping protrusion 42 is movably engaged in the corresponding second clamping groove 421. Then, the first sealing sleeve 2 is sleeved on the outside of the first sealing groove 101 through the first inner support 21, and the first clamping protrusion 211 is movably engaged in the corresponding first clamping groove 2111. Then, the second sealing sleeve 3 is movably sleeved on the outside of the second sealing groove 102 through the second inner support 31, and the third clamping protrusion 43 is movably engaged in the corresponding third clamping groove 301. Then, the first bolt 6 is used to fix the second inner support 31, the positioning ring 41, the buffer piston middle frame 1 and the first inner support 21. Finally, the piston inner sleeve 5 is inserted into the buffer piston middle frame 1, the positioning clip 51 is movably engaged in the corresponding positioning slot 501, and the end of the second bolt 52 is threadedly installed on the positioning clip 51;

[0035] This makes it easy to disassemble the first inner support 21 and quickly disassemble, repair and replace the first sealing sleeve 2, to disassemble the second inner support 31 and quickly disassemble, repair and replace the second sealing sleeve 3, to disassemble the piston outer sleeve 4 and replace it, and to disassemble the piston inner sleeve 5 and replace it, thereby improving the service life of the entire buffer piston assembly.

[0036] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A special buffer piston assembly for a pneumatic rock drill, comprising a buffer piston middle frame (1), characterized in that: A first sealing sleeve (2) is provided at the middle portion of the outer side of the buffer piston middle frame (1), a second sealing sleeve (3) is provided at one end of the outer side of the buffer piston middle frame (1), a piston outer sleeve (4) is provided on the outer side of the buffer piston middle frame (1) between the first sealing sleeve (2) and the second sealing sleeve (3), and a piston inner sleeve (5) is provided on the inner side of the buffer piston middle frame (1); The first sealing sleeve (2) is fixedly provided with a first inner support (21) in the middle, and an inner end seal (201) is integrally formed on the side of the inner wall of the first sealing sleeve (2) away from the second sealing sleeve (3), and the inner end seal (201) is in contact with the end of the first inner support (21). The second sealing sleeve (3) is fixedly provided with a second inner support (31) in the middle, and a positioning ring (41) is fixedly provided on the side of the inner wall of the piston sleeve (4) close to the second sealing sleeve (3).

2. A buffer piston assembly for a pneumatic rock drill according to claim 1, characterized in that: A first sealing groove (101) is provided in the middle of the outer side of the buffer piston middle frame (1); the first inner support (21) is movably sleeved on the outer side of the first sealing groove (101); a first latching protrusion (211) is integrally formed on the side of the first inner support (21) close to the second sealing sleeve (3); a first latching groove (2111) corresponding to the first latching protrusion (211) is provided on the buffer piston middle frame (1); and the first latching protrusion (211) is movably latched in the corresponding first latching groove (2111).

3. A buffer piston assembly for a pneumatic rock drill according to claim 2, characterized in that: A second sealing groove (102) corresponding to the second inner support (31) is provided at one end of the outer side of the buffer piston middle frame (1), and the second inner support (31) is movably sleeved on the outer side of the second sealing groove (102).

4. A buffer piston assembly for a pneumatic rock drill according to claim 3, characterized in that: A positioning slot (103) corresponding to the positioning ring (41) is provided on the outer wall of the buffer piston middle frame (1) at a side close to the second sealing sleeve (3), and the positioning ring (41) is movably engaged in the corresponding positioning slot (103).

5. A buffer piston assembly for a pneumatic rock drill according to claim 4, characterized in that: A second latching protrusion (42) is integrally formed on the side of the positioning ring (41) away from the second sealing sleeve (3), and a second latching groove (421) corresponding to the second latching protrusion (42) is provided on the buffer piston middle frame (1), and the second latching protrusion (42) is movably engaged in the corresponding second latching groove (421).

6. A buffer piston assembly for a pneumatic rock drill according to claim 5, characterized in that: A third latching protrusion (43) is integrally formed on one side of the positioning ring (41) close to the second sealing sleeve (3); a third latching groove (301) corresponding to the third latching protrusion (43) is provided on one side of the second inner support (31); and the third latching protrusion (43) is movably engaged in the corresponding third latching groove (301).

7. A buffer piston assembly for a pneumatic rock drill according to claim 6, characterized in that: The side of the second inner support (31) away from the positioning ring (41) is movable through the first bolt (6), and the end of the first bolt (6) is movable through the third clamping protrusion (43), the positioning ring (41), the second clamping protrusion (42) and the buffer piston middle frame (1) and is threadedly installed in the first clamping protrusion (211).

8. The buffer piston assembly for a pneumatic rock drill according to claim 1, characterized in that: The inner side of the buffer piston middle frame (1) is integrally formed with a plurality of positioning clips (51) distributed in a ring array, the outer wall of the piston inner sleeve (5) is provided with a positioning slot (501) corresponding to the positioning clip (51), the positioning clip (51) is movably engaged in the corresponding positioning slot (501), one end of the piston inner sleeve (5) is threadedly mounted with a second bolt (52), and the end of the second bolt (52) is threadedly mounted on the positioning clip (51).