Buffer device for hydraulic rock drill

Abstract

A buffer device for a hydraulic rock drill relates to the technical field of rock drill equipment and comprises a casing and a retarding box component, a piston component is movably connected in a cavity of the casing, an annular stopper is fixed in the cavity of the casing corresponding to a shoulder shaft on the piston component, and a spring is arranged between the annular stopper and the casing. The spring is arranged on the inner side of a cavity of the machine shell, a first magnetic sheet is fixedly embedded in a shoulder shaft of the piston assembly, a second magnetic sheet is fixedly embedded in the annular blocking piece, the first magnetic sheet and the second magnetic sheet are magnetic sheets of the same polarity, a buffering box is fixed to a side face support of the machine shell, and a buffering assembly is installed on the inner side of the buffering box. According to the buffer device for the hydraulic rock drill, the piston assembly is prevented from making contact with the annular stop piece through repulsive force between the magnetic sheets, abrasion caused by contact between a shoulder shaft on the piston assembly and a rubber pad on the annular stop piece can be avoided, and therefore the cost increased by material loss and the trouble that frequent maintenance is needed in the later period are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of rock drill equipment, in particular to a buffer device for a hydraulic rock drill. Background Art

[0002] A rock drill is a tool used to directly mine stone. It drills holes in the rock strata so that explosives can be placed to blast the rock, thereby completing the mining of stone or other stone works. When it is working, the piston makes a high-frequency reciprocating motion, constantly impacting the drill tail. The piston is prone to collide with the front and rear walls of the piston sleeve during the reciprocating motion.

[0003] The first step of the buffer device of the existing hydraulic rock drill is to perform preliminary buffering by the shoulder shaft hitting the rubber pad, such as the patent with the authorization publication number CN 217898619 U. During multiple impact contacts, the rubber pad will wear out and lose its buffering effect, so it is necessary to replace the new rubber pad, which increases the cost of use. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a buffer device for a hydraulic rock drill, which avoids the contact between the piston assembly and the annular baffle by the repulsive force between the magnetic sheets, and can avoid the wear caused by the contact between the shoulder shaft on the piston assembly and the rubber pad on the annular baffle, thereby avoiding the increased cost due to material loss and the trouble of frequent maintenance in the later stage, and can effectively solve the problems in the background technology.

[0005] In order to achieve the purpose of the utility model, the utility model adopts the following technical solutions:

[0006] A buffer device for a hydraulic rock drill comprises a casing and a blocking box assembly, wherein a piston assembly is movably connected to the cavity of the casing, an annular blocking member is fixed in the cavity of the casing at a position corresponding to a shoulder shaft on the piston assembly, a spring is provided between the annular blocking member and the casing, and the spring is arranged on the inner side of the cavity of the casing, a first magnetic sheet is embedded and fixed on the shoulder shaft of the piston assembly, a second magnetic sheet is embedded and fixed on the annular blocking member, and the first magnetic sheet and the second magnetic sheet are isotropic magnetic sheets, a buffer box is fixed on the side support of the casing, a buffer assembly is installed on the inner side of the buffer box, the buffer box is connected to the internal cavity of the casing through a first oil guide pipe, and the buffer box is connected to the blocking box in the blocking box assembly through a second oil guide pipe.

[0007] Furthermore, the connecting parts of the first oil guiding pipe and the second oil guiding pipe with the buffer box are both tangentially arranged.

[0008] Furthermore, the buffer assembly includes an impeller and a rotating shaft, and the impeller is rotatably mounted on the inner side of the buffer box via the rotating shaft.

[0009] Furthermore, the buffer assembly also includes a connecting ear and a torsion spring, the connecting ear is fixed to the outer end of the rotating shaft, the torsion spring is sleeved on the rotating shaft, and the ends of the torsion spring are fixedly connected to the connecting ear and the buffer box respectively.

[0010] Furthermore, it also includes a protection box, which is fixed to the side of the casing, and the blocking box assembly, the buffer box and the buffer assembly are all arranged on the inner side of the protection box.

[0011] Furthermore, it also includes an ear seat, and the blocking box on the blocking box assembly is fixed to the inner side of the protective box through the ear seat.

[0012] Compared with the prior art, the beneficial effect of the utility model is that the buffer device for the hydraulic rock drill has the following advantages: when the first magnetic plate on the shoulder shaft of the piston assembly approaches the second magnetic plate on the annular block, a repulsive force is generated therebetween, thereby performing preliminary buffering, and the repulsive force between the magnetic plates is used to avoid contact between the piston assembly and the annular block, which can avoid the wear caused by the contact between the shoulder shaft on the piston assembly and the rubber pad on the annular block, thereby avoiding the increased cost due to material loss and the trouble of frequent maintenance in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0014] Figure 2 It is a schematic diagram of the three-dimensional first cross-sectional structure of the utility model;

[0015] Figure 3 It is a schematic diagram of the three-dimensional second cross-sectional structure of the utility model.

[0016] In the figure: 1 casing, 2 piston assembly, 3 protection box, 4 buffer assembly, 41 connecting ear, 42 torsion spring, 43 impeller, 44 rotating shaft, 5 ear seat, 6 blocking box assembly, 7 second oil guide pipe, 8 second magnetic sheet, 9 first magnetic sheet, 10 annular stopper, 11 spring, 12 buffer box, 13 first oil guide pipe. DETAILED DESCRIPTION

[0017] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0018] See also Figure 1-3The present embodiment provides a technical solution: a buffer device for a hydraulic rock drill, comprising a casing 1 and a blocking box assembly 6, a piston assembly 2 is movably connected in the cavity of the casing 1, an annular block 10 is fixed in the cavity of the casing 1 at a position corresponding to the shoulder shaft of the piston assembly 2, a spring 11 is provided between the annular block 10 and the casing 1, and the spring 11 is arranged on the inner side of the cavity of the casing 1, a first magnetic sheet 9 is embedded and fixed on the shoulder shaft of the piston assembly 2, a second magnetic sheet 8 is embedded and fixed on the annular block 10, and the first magnetic sheet 9 and the second magnetic sheet 8 are isotropic magnetic sheets, a buffer box 12 is fixed on the side support of the casing 1, a buffer assembly 4 is installed on the inner side of the buffer box 12, and the buffer box 12 is connected to the oil pump 11 through a first oil guide pipe 13. The internal cavity of the casing 1 is connected, and the buffer box 12 is connected to the blocking box in the blocking box assembly 6 through the second oil guide pipe 7. When the shoulder shaft of the piston assembly 2 moves in the cavity in the casing 1 and approaches the annular block 10, since the first magnetic sheet 9 and the second magnetic sheet 8 are isotropic magnetic sheets, when the first magnetic sheet 9 on the shoulder shaft of the piston assembly 2 approaches the second magnetic sheet 8 on the annular block 10, a repulsive force is generated therebetween, thereby performing preliminary buffering. The repulsive force between the magnetic sheets is used to prevent the piston assembly 2 from contacting the annular block 10, which can avoid the wear caused by the contact between the shoulder shaft on the piston assembly 2 and the rubber pad on the annular block 10, thereby avoiding the increased cost due to material loss and the trouble of frequent maintenance in the later stage.

[0019] The first oil guide pipe 13 and the second oil guide pipe 7 are connected to the buffer box 12 at a tangential position. The buffer assembly 4 includes an impeller 43 and a rotating shaft 44. The impeller 43 is rotatably mounted on the inner side of the buffer box 12 through the rotating shaft 44. The buffer assembly 4 also includes a connecting ear 41 and a torsion spring 42. The connecting ear 41 is fixed to the outer end of the rotating shaft 44, and the torsion spring 42 is sleeved on the rotating shaft 44. The ends of the torsion spring 42 are respectively fixedly connected to the connecting ear 41 and the buffer box 12. The spring 11 arranged inside the annular baffle 10 is compressed for activation. The plug assembly 2 is buffered again. The blocking oil in the cavity of the casing 1 enters the buffer box 12 through the first oil guide pipe 13 under the squeezing of the annular baffle 10. The blocking oil impacts the impeller 43 to rotate. The impeller 43 drives the connecting ear 41 to rotate through the rotating shaft 44. The connecting ear 41 drives the torsion spring 42 to deflect, and the torsion spring 42 is elastically deformed to perform buffering again. The blocking oil in the buffer box 12 enters the blocking box assembly 6 through the second oil guide pipe 7. The structure and buffering process in the blocking box assembly 6 are the same as those in the authorization publication number CN 217898619 U, which further improves the buffering performance of the piston assembly 2.

[0020] It also includes a protective box 3, which is fixed on the side of the casing 1. The blocking box assembly 6, the buffer box 12 and the buffer assembly 4 are all arranged on the inner side of the protective box 3. It also includes an ear seat 5. The blocking box on the blocking box assembly 6 is fixed on the inner side of the protective box 3 through the ear seat 5. The protective box 3 is used to protect its internal components to avoid adverse effects on its internal components caused by external collisions.

[0021] The working principle of the buffer device for a hydraulic rock drill provided by the utility model is as follows: when the shoulder shaft of the piston assembly 2 moves in the cavity in the housing 1 and approaches the annular stopper 10, since the first magnetic sheet 9 and the second magnetic sheet 8 are isotropic magnetic sheets, when the first magnetic sheet 9 on the shoulder shaft of the piston assembly 2 approaches the second magnetic sheet 8 on the annular stopper 10, a repulsive force is generated therebetween, thereby performing preliminary buffering, and the repulsive force between the magnetic sheets is used to prevent the piston assembly 2 from contacting the annular stopper 10, and the spring 11 arranged inside the annular stopper 10 is compressed for the piston The component 2 is buffered again. The blocking oil in the cavity of the casing 1 enters the buffer box 12 through the first oil guide pipe 13 under the squeezing of the annular baffle 10. The blocking oil impacts the impeller 43 to rotate. The impeller 43 drives the connecting ear 41 to rotate through the rotating shaft 44. The connecting ear 41 drives the torsion spring 42 to deflect. The torsion spring 42 is elastically deformed to perform buffering again. The blocking oil in the buffer box 12 enters the blocking box component 6 through the second oil guide pipe 7. The structure and buffering process in the blocking box component 6 are the same as those in the authorization publication number CN 217898619 U.

[0022] It is worth noting that the components disclosed in the above embodiments are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods. The blocking box assembly 6 adopts the blocking box and its internal structure in the patent with authorization publication number CN 217898619 U, and its working principle is the same, that is, like magnets repel each other and opposite magnets attract each other.

[0023] The parts of the present invention that are not described in detail are prior art. Although the present invention is specifically demonstrated and introduced in conjunction with the preferred implementation scheme, there are many methods and ways to implement the technical solution. The above is only a preferred implementation scheme of the present invention. However, technical personnel in the relevant field should understand that various changes can be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined in the attached claims, which are all within the scope of protection of the present invention.

Claims

1. A buffer device for a hydraulic rock drill, comprising a housing (1) and a blocking box assembly (6), wherein a piston assembly (2) is movably connected to a cavity of the housing (1), an annular stopper (10) is fixed to a position corresponding to an upper shoulder shaft of the piston assembly (2) in the cavity of the housing (1), a spring (11) is provided between the annular stopper (10) and the housing (1), and the spring (11) is arranged inside the cavity of the housing (1), characterized in that: A first magnetic sheet (9) is embedded and fixed on the shoulder shaft of the piston assembly (2), a second magnetic sheet (8) is embedded and fixed on the annular stopper (10), and the first magnetic sheet (9) and the second magnetic sheet (8) are magnetic sheets of the same polarity. A buffer box (12) is fixed on the side support of the housing (1), and a buffer assembly (4) is installed on the inner side of the buffer box (12). The buffer box (12) is connected to the internal cavity of the housing (1) through a first oil guide pipe (13), and the buffer box (12) is connected to the blocking box in the blocking box assembly (6) through a second oil guide pipe (7).

2. A buffer device for a hydraulic rock drill according to claim 1, characterized in that: The connecting points between the first oil guide pipe (13) and the second oil guide pipe (7) and the buffer box (12) are both arranged tangentially.

3. A buffer device for a hydraulic rock drill according to claim 1, characterized in that: The buffer assembly (4) comprises an impeller (43) and a rotating shaft (44); the impeller (43) is rotatably mounted on the inner side of the buffer box (12) via the rotating shaft (44).

4. A buffer device for a hydraulic rock drill according to claim 3, characterized in that: The buffer assembly (4) further comprises a connecting ear (41) and a torsion spring (42); the connecting ear (41) is fixed to the outer end of the rotating shaft (44); the torsion spring (42) is sleeved on the rotating shaft (44); and the ends of the torsion spring (42) are respectively fixedly connected to the connecting ear (41) and the buffer box (12).

5. A buffer device for a hydraulic rock drill according to claim 1, characterized in that: It also comprises a protection box (3), wherein the protection box (3) is fixed to a side surface of the housing (1), and the blocking box assembly (6), the buffer box (12) and the buffer assembly (4) are all arranged on the inner side of the protection box (3).

6. A buffer device for a hydraulic rock drill according to claim 5, characterized in that: It also comprises an ear seat (5), and the blocking box on the blocking box assembly (6) is fixed to the inner side of the protection box (3) through the ear seat (5).

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