Non-destructive dismounting device for countersunk bolt

Abstract

The utility model discloses a non-destructive dismounting device for a countersunk bolt. The non-destructive dismounting device comprises a dismounting device shell, a spiral dismounting impact block and a screwdriver bit, the whole dismounting device shell is a cylindrical body with an opening in the upper end, the spiral dismounting impact block is sleeved with the opening cavity of the dismounting device shell in a limited mode and can move up and down in the dismounting device shell in a spiral mode relative to the dismounting device shell, and the screwdriver bit is detachably embedded and fixed to the upper end face of the spiral dismounting impact block. The end of the screwdriver bit is always exposed out of the opening in the upper end of the dismounting device shell; according to the utility model, the problems of bolt fastening glue locking, bolt loosening incapability, bolt corrosion and the like can be solved by using the device provided by the utility model; the assembly can only be disassembled in a destructive mode or a cutting mode due to disassembly and damage of the countersunk bolt in the past, after the device is applied, the disassembly and damage rate of the countersunk bolt in the trial-manufacture experiment process of a new product of a new energy automobile electric drive system can be effectively reduced, the experiment period of the new product is greatly shortened, and the experiment efficiency of the new product is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of maintenance tooling, in particular to a non-destructive disassembly device for countersunk bolts. Background Art

[0002] With the rapid development of new energy vehicles, the trial production cycle of new products is becoming faster and faster, and experimental verification resources are in short supply. Since each new product of the electric drive system is a brand-new design in the trial production stage, it is inevitable that after the trial production and assembly of the new product of the electric drive system assembly, there will be abnormal conditions such as rust and locking of the countersunk bolts in key parts, which will make it impossible to disassemble it with conventional tools. In the trial production stage, repeated experimental disassembly and analysis are an inevitable process. During the trial production process, an electric drive system often needs to complete multiple stage-related experiments, and each stage of the experiment needs to be disassembled and analyzed. During the disassembly process, due to the rust of the countersunk bolts in key parts, the bolt heads are damaged and cannot be disassembled using traditional tools, which in turn makes it impossible for the entire electric drive system assembly to continue to complete subsequent tests. Professional bench test resources are in short supply, and the cycle of going up and down the bench is long and inefficient. Once a simple abnormal problem occurs, the test of the entire electric drive system assembly cannot continue, which will seriously affect the progress of the project test. Such repeated operations have a long experimental cycle and low efficiency, which often cause rework, affecting the project progress and delaying the experimental nodes. Summary of the invention

[0003] In order to solve the above problems, the utility model provides a non-destructive disassembly device for countersunk bolts, which can solve the problem of difficult disassembly of countersunk bolts of various types. For example, the bolts cannot be loosened due to the locking of bolt tightening glue, the high temperature operation of the motor assembly, and the rust of bolts caused by durability tests and wading tests can all be disassembled using the device of this application. In the past, it was common that the electric drive system of new energy vehicles was damaged due to the disassembly of countersunk bolts, resulting in the assembly having to be disassembled destructively or by cutting. After the application of this device, the disassembly and damage rate of countersunk bolts during the trial production experiment of new products of the electric drive system of new energy vehicles can be effectively reduced, thereby greatly shortening the experimental cycle and experimental efficiency of new products.

[0004] The utility model provides a non-destructive disassembly device for countersunk bolts, comprising a disassembly device housing, a spiral disassembly impact block and a screwdriver head;

[0005] The disassembly device shell is a cylindrical body with an opening at the upper end as a whole. The spiral disassembly impact block is limitedly sleeved in the opening cavity of the disassembly device shell, and the spiral disassembly impact block can be displaced up and down in the disassembly device shell relative to the spiral of the disassembly device shell. The screwdriver head is detachably embedded and fixed on the upper end surface of the spiral disassembly impact block, and the end of the screwdriver head is always exposed outside the upper end opening of the disassembly device shell. The spiral sliding cooperation between the disassembly device shell and the spiral disassembly impact block makes it possible for the screwdriver head to be tightly pressed into the bolt head rotation groove of the countersunk bolt when the hammer strikes the lower end surface of the disassembly device shell vertically. The screwdriver head that is in contact with the countersunk bolt is tightly pressed into the bolt head rotation groove of the countersunk bolt, and the screwdriver head is subjected to the external force of the disassembly device shell in a straight line downward direction, and the spiral disassembly impact block rotates along the spiral groove of the disassembly device shell. The upward rotation drives the screwdriver head to rotate horizontally, and the screwdriver head simultaneously transmits downward pressure and horizontal rotational force to the countersunk bolt, so that the countersunk bolt and the screwed workpiece can be shaken loose and unscrewed. The downward pressure of the screwdriver head can ensure that the screwdriver head is always in contact with the rotation groove of the end face of the countersunk bolt, avoiding the screwdriver head from being separated from the close contact with the rotation groove of the countersunk bolt when rotating horizontally, resulting in the countersunk bolt groove being damaged by the screwdriver head being twisted off and unable to loosen the countersunk bolt. The device can convert the vertical force of the hammer into the screwdriver head, and can simultaneously apply vertical vibration force and horizontal rotational force to the countersunk bolt. The existing technology often needs to apply a large horizontal rotational force to the countersunk bolt, while the present device only needs to apply a very small hammer force to loosen the countersunk bolt.

[0006] A forward or reverse spiral curve segment groove is arranged on the inner wall of the hollow cavity near the opening of the disassembly device shell, and a detachable sliding fitting device is correspondingly arranged on the side wall of the spiral disassembly impact block. The detachable sliding fitting device can spirally rise or spirally descend along the spiral curve segment groove.

[0007] The detachable sliding fitting device includes an insert blind hole and an insert protrusion, the rear end of the insert protrusion is matched and inserted in the insert blind hole, and the front end of the insert protrusion is a ball head surface, which can be slidably connected to the spiral curve segment groove; or, the detachable sliding fitting device includes a hemispherical groove and a steel ball, a part of the steel ball is rotatably seated in the hemispherical groove, and the other part of the steel ball can be slidably connected to the spiral curve segment groove; the outer side wall of the disassembly device shell is provided with a mounting hole corresponding to the position of the spiral curve segment groove, and a closing plug can be opened and closed and fixed on the mounting hole. The setting of the mounting hole facilitates the assembly of the spiral disassembly impact block in the cavity of the disassembly device shell, and the spiral disassembly impact block can spirally rise or spirally descend along the spiral curve segment groove through the assembled insert protrusion or steel ball.

[0008] The included angle between the projection line of the spiral curved segment groove on the vertical plane and the horizontal line is 30°-40°, so that the spiral disassembly impact block can generate maximum torsional force after being subjected to vertical external force.

[0009] A reset spring is elastically connected between the inner bottom wall of the hollow cavity of the disassembly device shell and the lower bottom wall of the spiral disassembly impact block so as to hammer the rear end face of the disassembly device shell. After the spiral disassembly impact block rotates to the very end of the spiral curved segment groove, it can be affected by the compression elastic force of the reset spring and the spiral disassembly impact block rotates down to the initial end of the spiral curved segment groove.

[0010] A first positioning boss is protruded on the lower bottom wall of the spiral disassembly impact block, and a second positioning boss is correspondingly protruded on the inner bottom wall of the hollow cavity of the disassembly device shell. Both ends of the reset spring are respectively limitedly sleeved on the outside of the first positioning boss and the second positioning boss.

[0011] The upper end surface of the spiral disassembly impact block is provided with a magnetic fixing groove, and the screwdriver head is matched and fixed in the magnetic fixing groove by magnetic attraction. This design can replace the screwdriver head of corresponding size according to different types of bolts.

[0012] A limiting snap ring groove is circumferentially provided on the inner side wall of the opening end of the disassembly device shell, and an elastic limiting snap ring is matched and embedded in the limiting snap ring groove. The upper part of the spiral disassembly impact block is a step structure, and the step structure of the spiral disassembly impact block can be in limiting contact with the elastic limiting snap ring to further prevent the spiral disassembly impact block from accidentally falling out of the disassembly device shell due to the spring force.

[0013] The materials of the disassembly device housing, the spiral disassembly impact block and the elastic limit clamp ring are all made of metal steel to increase the hammer impact strength and the torsional strength.

[0014] The outer side wall of the disassembly device housing is provided with gripping anti-slip grooves to increase gripping friction.

[0015] Beneficial Effects

[0016] The utility model can solve the problem of difficulty in disassembling countersunk bolts of various types. For example, the problem of bolt rust caused by bolt tightening glue locking, high temperature operation of the motor assembly causing the bolt to be unable to loosen, and durability test and wading test can all be disassembled using the device of the application. In the past, it was common that the electric drive system of new energy vehicles was damaged due to the disassembly of countersunk bolts, resulting in the assembly having to be disassembled destructively or by cutting. The application of the device can effectively reduce the disassembly and damage rate of countersunk bolts during the trial production experiment of new products of the electric drive system of new energy vehicles, thereby greatly shortening the experimental cycle and experimental efficiency of new products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the working principle structure of the utility model.

[0018] Figure 2 It is a schematic diagram of the half-section structure of the shell of the disassembly device of the utility model.

[0019] Figure 3The utility model is a schematic diagram of the combined structure of a spiral disassembly impact block, a screwdriver head and a reset spring.

[0020] Figure 4 It is a schematic diagram of the overall cross-sectional structure of the utility model.

[0021] Figure 5 The utility model is another embodiment of the spiral disassembly impact block, the screwdriver head and the reset spring assembly structure schematic diagram.

[0022] In the figure:

[0023] 1. Disassembly device housing; 11. Spiral curved groove; 12. Mounting hole; 13. Closing plug; 14. Second positioning boss; 15. Limiting snap ring groove; 16. Elastic limiting snap ring;

[0024] 2. Screw disassembly impact block; 21. Removable sliding fitting device; 211. Insertion blind hole; 212. Insertion convex block; 213. Hemispherical groove; 214. Steel ball; 22. First positioning convex column; 23. Magnetic fixing groove;

[0025] 3. Screwdriver bits;

[0026] 4. Return spring. DETAILED DESCRIPTION

[0027] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0028] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; 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 the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example 1

[0031] See also Figure 1-Figure 4 As shown, a non-destructive disassembly device for countersunk bolts includes a disassembly device housing 1, a spiral disassembly impact block 2, and a screwdriver head 3;

[0032] The disassembly device housing 1 is a cylindrical body with an open upper end as a whole. The spiral disassembly impact block 2 is limitedly sleeved in the open cavity of the disassembly device housing 1, and the spiral disassembly impact block 2 can be spirally displaced up and down relative to the disassembly device housing 1 in the disassembly device housing 1. The screwdriver head 3 is detachably embedded and fixed on the upper end surface of the spiral disassembly impact block 2, and the end of the screwdriver head 3 is always exposed outside the upper end opening of the disassembly device housing 1.

[0033] A counter-rotating spiral curve segment groove 11 is arranged on the inner wall of the hollow cavity near the opening of the disassembly device shell 1, and a detachable sliding fitting device 21 is correspondingly arranged on the side wall of the spiral disassembly impact block 2. The detachable sliding fitting device 21 can spirally rise along the spiral curve segment groove 11.

[0034] The detachable sliding fitting device 21 includes a hemispherical groove 213 and a steel ball 214, a part of the steel ball 214 is rotatably seated in the hemispherical groove 213, and the other part of the steel ball 214 is slidably connected to the spiral curved segment groove 11; the outer side wall of the disassembly device shell 1 is provided with a mounting hole 12 corresponding to the position of the spiral curved segment groove 11, and a closing plug 13 is fixed on the mounting hole 12 which can be opened and closed.

[0035] The included angle between the projection line of the spiral curved groove 11 on the vertical plane and the horizontal line is 30°.

[0036] The upper end surface of the spiral disassembly impact block 2 is provided with a magnetic fixing groove 23, and the screwdriver head 3 is matched and fixed in the magnetic fixing groove 23 by magnetic attraction.

[0037] The disassembly device housing 1 , the spiral disassembly impact block 2 and the elastic limiting clamp 16 are all made of metal steel.

[0038] The outer side wall of the disassembly device housing 1 is provided with gripping anti-slip grooves.

[0039] Example 2

[0040] See also Figure 2 , Figure 5 As shown, a non-destructive disassembly device for countersunk bolts includes a disassembly device housing 1, a spiral disassembly impact block 2, and a screwdriver head 3;

[0041] The disassembly device housing 1 is a cylindrical body with an open upper end as a whole. The spiral disassembly impact block 2 is limitedly sleeved in the open cavity of the disassembly device housing 1, and the spiral disassembly impact block 2 can be spirally displaced up and down relative to the disassembly device housing 1 in the disassembly device housing 1. The screwdriver head 3 is detachably embedded and fixed on the upper end surface of the spiral disassembly impact block 2, and the end of the screwdriver head 3 is always exposed outside the upper end opening of the disassembly device housing 1.

[0042] A positively rotating spiral curve segment groove 11 is arranged on the inner wall of the hollow cavity near the opening of the disassembly device shell 1, and a detachable sliding fitting device 21 is correspondingly arranged on the side wall of the spiral disassembly impact block 2. The detachable sliding fitting device 21 can spirally rise along the spiral curve segment groove 11.

[0043] The detachable sliding fitting device 21 includes a plug-in blind hole 211 and an plug-in protrusion 212. The rear end of the plug-in protrusion 212 is matched and plugged into the plug-in blind hole 211, and the front end of the plug-in protrusion 212 is a ball head surface, which can be slidably connected to the spiral curved segment groove 11; the outer side wall of the disassembly device shell 1 is provided with a mounting hole 12 corresponding to the position of the spiral curved segment groove 11, and a closing plug 13 can be opened and closed and fixed on the mounting hole 12.

[0044] The included angle between the projection line of the spiral curved groove 11 on the vertical plane and the horizontal line is 35°.

[0045] The upper end surface of the spiral disassembly impact block 2 is provided with a magnetic fixing groove 23, and the screwdriver head 3 is matched and fixed in the magnetic fixing groove 23 by magnetic attraction.

[0046] The disassembly device housing 1 , the spiral disassembly impact block 2 and the elastic limiting clamp 16 are all made of metal steel.

[0047] The outer side wall of the disassembly device housing 1 is provided with gripping anti-slip grooves.

[0048] Example 3

[0049] See also Figure 1-Figure 5 As shown, a non-destructive disassembly device for countersunk bolts is different from Example 2 in that a reset spring 4 is elastically connected between the inner bottom wall of the hollow cavity of the disassembly device shell 1 and the lower bottom wall of the spiral disassembly impact block 2.

[0050] A first positioning boss 22 is protruded from the lower bottom wall of the spiral disassembly impact block 2, and a second positioning boss 14 is correspondingly protruded from the inner bottom wall of the hollow cavity of the disassembly device shell 1. The two ends of the reset spring 4 are respectively limitedly sleeved on the outside of the first positioning boss 22 and the second positioning boss 14.

[0051] Example 4

[0052] See also Figure 2-Figure 4 As shown, a non-destructive disassembly device for countersunk bolts is different from Example 3 in that a limiting snap ring groove 15 is circumferentially provided on the inner side wall of the open end of the disassembly device shell 1, and an elastic limiting snap ring 16 is embedded in the limiting snap ring groove 15. The upper part of the spiral disassembly impact block 2 is a step structure, and the step structure of the spiral disassembly impact block 2 can be in limiting contact with the elastic limiting snap ring 16.

[0053] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A non-destructive disassembly device for countersunk bolts, characterized in that: It comprises a disassembly device housing (1), a spiral disassembly impact block (2) and a screwdriver head (3); The disassembly device housing (1) is a cylindrical body with an opening at the upper end. The spiral disassembly impact block (2) is limitedly sleeved in the opening cavity of the disassembly device housing (1), and the spiral disassembly impact block (2) can be displaced up and down relative to the disassembly device housing (1) in a spiral manner within the disassembly device housing (1). The screwdriver head (3) is detachably embedded and fixed on the upper end surface of the spiral disassembly impact block (2), and the end of the screwdriver head (3) is always exposed outside the upper end opening of the disassembly device housing (1).

2. The non-destructive removal device for countersunk bolts according to claim 1, characterized in that: A forward or reverse spiral curved segment groove (11) is provided on the inner wall of the hollow cavity of the disassembly device housing (1) near the opening, and a detachable sliding fitting device (21) is correspondingly provided on the side wall of the spiral disassembly impact block (2), and the detachable sliding fitting device (21) can spirally rise or spirally descend along the spiral curved segment groove (11).

3. The non-destructive removal device for countersunk bolts according to claim 2, characterized in that: The detachable sliding fitting device (21) comprises an insertion blind hole (211) and an insertion protrusion (212), the rear end of the insertion protrusion (212) being matched and inserted into the insertion blind hole (211), and the front end of the insertion protrusion (212) being a ball head surface, which can be slidably connected to the spiral curved segment groove (11); or, the detachable sliding fitting device (21) comprises a hemispherical groove (213) and a steel ball (214), a part of the steel ball (214) being rotatably seated in the hemispherical groove (213), and another part of the steel ball (214) being slidably connected to the spiral curved segment groove (11); an outer wall of the disassembly device housing (1) is provided with a mounting hole (12) corresponding to the position of the spiral curved segment groove (11), and a closing plug (13) is fixed on the mounting hole (12) in an openable and closable manner.

4. The non-destructive removal device for countersunk bolts according to claim 3, characterized in that: The included angle between the projection line of the spiral curved segment groove (11) on the vertical plane and the horizontal line is 30°-40°.

5. The non-destructive removal device for countersunk bolts according to claim 4, characterized in that: A return spring (4) is elastically connected between the inner bottom wall of the hollow cavity of the disassembly device housing (1) and the lower bottom wall of the spiral disassembly impact block (2).

6. The non-destructive removal device for countersunk bolts according to claim 5, characterized in that: A first positioning convex column (22) is protruding from the lower bottom wall of the spiral disassembly impact block (2), a second positioning convex column (14) is correspondingly protruding from the inner bottom wall of the hollow cavity of the disassembly device housing (1), and two ends of the return spring (4) are respectively limitedly sleeved outside the first positioning convex column (22) and the second positioning convex column (14).

7. The non-destructive removal device for countersunk bolts according to claim 6, characterized in that: The upper end surface of the spiral disassembly impact block (2) is provided with a magnetic attraction fixing groove (23), and the screwdriver head (3) is matched and magnetically fixed in the magnetic attraction fixing groove (23).

8. The non-destructive removal device for countersunk bolts according to claim 7, characterized in that: A limiting snap ring groove (15) is circumferentially provided on the inner side wall of the opening end of the disassembly device housing (1), and an elastic limiting snap ring (16) is matched and embedded in the limiting snap ring groove (15). The upper part of the spiral disassembly impact block (2) is a step structure, and the step structure of the spiral disassembly impact block (2) can be in limiting contact with the elastic limiting snap ring (16).

9. The non-destructive removal device for countersunk bolts according to claim 8, characterized in that: The materials of the disassembly device housing (1), the spiral disassembly impact block (2) and the elastic limiting clamping ring (16) are all made of metal steel.

10. The non-destructive removal device for countersunk bolts according to claim 9, characterized in that: The outer side wall of the disassembly device housing (1) is provided with gripping anti-slip grooves.

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