Screw dismounting tool

Abstract

The utility model provides a screw dismounting tool which is used for dismounting a screw with one end screwed in a workpiece and the other end exposed, and comprises a connecting part, the second end of the connecting part is used for being in threaded connection with the exposed end of the screw, the connecting part is provided with a push rod, and the push rod is used for being in contact with the screw to apply acting force when the screw dismounting tool is assembled to the screw to be dismounted; the driving part is rotatably connected to the first end of the connecting part, the first end of the connecting part is the end, away from the screw rod, of the connecting part, the driving part comprises a hydraulic driving unit, and the hydraulic driving unit can drive the push rod to move towards the screw rod or move away from the screw rod, so that pressing force is applied to the exposed end of the screw rod or removed from the exposed end of the screw rod. The driving part does not need to additionally occupy the space of the peripheral side of the screw rod, the screw rod can be prevented from loosening when the connecting part rotates, meanwhile, the rotating torque formed by the pressing force is larger than the resistance torque, the screw rod is effectively driven to be screwed out of the threaded hole of the workpiece, the automation degree is higher, and operation is easy and saves labor.

Description

Technical Field

[0001] This utility model relates to the field of tooling technology, and in particular to a screw disassembly tool. Background Technology

[0002] For screws with one end exposed and the other end screwed into the threaded hole of a workpiece (partially protruding from the workpiece), removal has always been a troublesome issue. In existing technology, the removal process involves screwing two nuts onto the exposed end of the screw; using a wrench to tighten the two nuts until they are tightly fitted; using an open-end wrench to hold the nut closest to the workpiece, applying force in the loosening direction to unscrew the screw from the threaded hole; and then removing the two nuts from the screw in sequence to remove the partially protruding screw. However, in practice, it has been found that the above disassembly method is time-consuming, requires manual removal, and often results in both nuts being turned simultaneously without the screw remaining stationary. Furthermore, this method requires sufficient radial space for the screw, necessitating ample space for wrench movement; however, in practice, other bolts or screws are often present nearby, making the process difficult. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defect in the prior art that the screws that extend out of the workpiece are difficult to remove, and to provide a screw removal tool.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A screw disassembly tool is used to disassemble a screw with one end screwed into a workpiece and the other end exposed. The screw disassembly tool includes:

[0006] The connecting part has a second end for screwing the exposed end of the screw rod. The connecting part is provided with a push rod, which is used to contact the screw rod to apply force when the screw rod disassembly tool is assembled to the screw rod to be disassembled.

[0007] The drive unit is rotatably connected to a first end of the connecting part, the first end of the connecting part being the end of the connecting part away from the screw. The drive unit includes a hydraulic drive unit capable of driving the push rod to move the push rod toward or away from the screw, thereby applying or removing a clamping force to the exposed end of the screw.

[0008] In this solution, a drive unit and a connecting unit are incorporated to drive the screw, which is threaded to the connecting unit, out of the workpiece, replacing manual tightening. The drive unit can rotate the connecting unit without occupying space on the outer periphery of the screw, ensuring operational feasibility. Furthermore, compared to the issue of two nuts stacked together causing the screw to easily loosen during clamping, the drive unit, driving the push rod, applies a clamping force to the exposed end of the screw, continuously keeping the connecting unit clamping the screw and preventing it from loosening during rotation. Simultaneously, the rotational torque generated by the clamping force when the connecting unit rotates is greater than the resistance torque, effectively driving the screw out of the workpiece's threaded hole. This results in higher automation and simpler, less labor-intensive operation.

[0009] Preferably, the drive unit further includes a rotary drive unit, which includes a gripping part and a receiving part. The receiving part has a receiving hole, and the first end of the connecting part extends into the receiving hole. The gripping part includes a drive module, which drives the receiving part to rotate. The hydraulic drive unit is disposed on the gripping part, and the hydraulic drive unit drives the push rod to abut against the exposed end of the screw.

[0010] In this design, the aforementioned configuration drives the connecting part to rotate, which in turn drives the screw to rotate. Additionally, a hydraulic drive unit drives the push rod to move and abut against the exposed end of the screw.

[0011] Preferably, the receiving hole is any one of a hexagonal hole, a square hole, or a spline hole, the first end of the connecting part is embedded in the receiving hole, and the outer surface of the first end of the connecting part is in contact with the hole wall of the receiving hole.

[0012] In this solution, by increasing the friction between the receiving hole and the first end contact portion of the connecting part through the above-mentioned settings, the driving part can smoothly drive the connecting part to rotate. At the same time, the rotational torque of the connecting part can be effectively transmitted to the screw clamped by the connecting part and drive the screw to rotate.

[0013] Preferably, the connecting part includes a sleeve and an end cap. The sleeve has an internal threaded hole, a first mounting hole, and a second mounting hole that are sequentially connected along its own axial direction. The screw is screwed to the internal threaded hole. The first mounting hole is used to accommodate the push rod, and the second mounting hole is used to accommodate the end cap. The end cap is connected to the hydraulic drive unit. When the hydraulic drive unit is turned on, the hydraulic drive unit inputs a pressurizing medium into the first mounting hole through the end cap, and pushes the push rod against the exposed end of the screw through the pressurizing medium.

[0014] In this solution, the above settings enable the pressurizing medium to push the push rod to move within the first mounting hole, and when the hydraulic drive unit is turned on, the pressurizing medium can continuously provide pressure for the push rod to move, i.e., maintain pressure, to prevent the screw from being loosened when the connecting part rotates, thus preventing the connecting part from spinning freely.

[0015] Preferably, the first mounting hole is a stepped hole, and the push rod has a protrusion in the radial direction. The protrusion is used to abut against the stepped surface of the stepped hole to limit the movement distance of the push rod.

[0016] In this solution, the above-mentioned settings are used to prevent leakage of the pressurized medium when the push rod extends out of the first mounting hole.

[0017] Preferably, the first mounting hole further includes an elastic element located between the stepped surface and the protrusion.

[0018] In this solution, the above-mentioned settings enable the push rod to be reset via the elastic element when the hydraulic drive unit is depressurized, the clamping force disappears, and the screw can be smoothly screwed out of the connecting part after the workpiece is unscrewed.

[0019] Preferably, the connecting portion further includes a connector, which is sleeved on the first end of the end cap and the end cap is rotatable relative to the connector. The connector is connected to the hydraulic drive unit. The end cap has a first connecting hole along its axial direction, which is connected to the first mounting hole. The end cap has a second connecting hole along its radial direction. An annular first connecting groove is formed between the contact surface of the first end of the end cap and the connector. The first connecting groove surrounds the outer surface of the first end of the end cap and is connected to the second connecting hole. The pressurizing medium flows into the end cap and into the first mounting hole through the first connecting groove, the second connecting hole, and the first connecting hole.

[0020] In this solution, the above settings ensure that the pressurizing medium always flows from the connector into the end cover and the first mounting hole when the end cover rotates with the sleeve, thus maintaining continuous pressure and ensuring that the push rod abuts against the exposed end of the screw.

[0021] Preferably, the connecting portion further includes a first sealing element and a second sealing element, the first sealing element being disposed on the wall of the first mounting hole and contacting the side wall of the protrusion, and the second sealing element being disposed on the bottom of the second mounting hole and contacting the second end of the end cap.

[0022] In this solution, the above-mentioned settings are used to prevent leakage of the pressurized medium when it flows into the first mounting hole and the end cap, thereby improving the sealing performance of the connection.

[0023] Preferably, the hydraulic drive unit is any one of an electric hydraulic pump, a pneumatic hydraulic pump, or a manual hydraulic pump.

[0024] In this solution, the above-mentioned settings are used to pump the booster medium into the first mounting hole.

[0025] Preferably, the drive module is any one of an electric drive device, a pneumatic drive device, or a pulse drive device.

[0026] In this solution, the above-mentioned configuration is used to drive the connecting part inside the receiving hole to rotate, and then, with the cooperation of the connecting part and the driving part, when the screw is clamped, it drives the screw to rotate out of the threaded hole of the workpiece.

[0027] The significant advantages of this invention are as follows: By incorporating a driving unit and a connecting unit, the screw connected to the connecting unit is driven to unscrew the workpiece, replacing manual tightening. The driving unit can rotate the connecting unit without occupying space on the outer periphery of the screw, ensuring operational feasibility. Furthermore, compared to the issue of two stacked nuts causing loosening during screw clamping, the driving unit, driving the push rod, applies a clamping force to the exposed end of the screw, continuously keeping the connecting unit clamping the screw and preventing it from loosening during rotation. Simultaneously, the rotational torque generated by the clamping force when the connecting unit rotates is greater than the resistance torque, effectively driving the screw to unscrew the workpiece from the threaded hole. This results in higher automation and simpler, less labor-intensive operation. Attached Figure Description

[0028] Figure 1 This diagram shows the positional relationship between the workpiece and the screw disassembly tool according to a preferred embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram of the connection between the connecting part and the screw in a preferred embodiment of the present invention.

[0030] Figure 3 This diagram shows the positional relationship between the push rod and the screw rod in a preferred embodiment of the present invention.

[0031] Figure 4 This diagram shows the positional relationship between the driving part and the connecting part in a preferred embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram of the screw disassembly tool according to a preferred embodiment of the present invention.

[0033] Figure 6 This is a perspective view of the end cap of a preferred embodiment of the present invention.

[0034] Figure 7 This is a schematic diagram of the connector structure according to a preferred embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] Screw disassembly tool 100

[0037] Drive Unit 1

[0038] Rotary drive unit 11

[0039] Holding part 111

[0040] Receiving hole 112

[0041] Reception Section 113

[0042] Hydraulic drive unit 12

[0043] Connecting part 2

[0044] Sleeve 20

[0045] Internal threaded hole 201

[0046] First mounting hole 202

[0047] Stepped surface 2021

[0048] Second mounting hole 203

[0049] Putter 21

[0050] 211 protrusions

[0051] End cap 22

[0052] First connecting hole 221

[0053] Second connecting hole 222

[0054] First connecting groove 223

[0055] Installation Section 3

[0056] Elastic element 4

[0057] Connector 5

[0058] First sealing element 6

[0059] Second seal 7

[0060] Workpiece 200

[0061] Threaded hole 204

[0062] Screw 300 Detailed Implementation

[0063] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0064] This embodiment provides a screw disassembly tool 100, the specific structure of which is as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the screw removal tool 100 is used to remove a screw 300 that is screwed into the workpiece 200 at one end and exposed at the other end. The screw removal tool 100 includes:

[0065] The connecting part 2 has a second end for screwing the exposed end of the screw 300. The connecting part 2 is provided with a push rod 21, which is used to contact the screw 300 to apply force when the screw removal tool is assembled to the screw 300 to be removed.

[0066] The drive unit 1 is rotatably connected to the first end of the connecting part 2, which is the end of the connecting part 2 away from the screw 300. The drive unit 1 includes a hydraulic drive unit 12, which can drive the push rod 21 to move toward or away from the screw 300, thereby applying or removing the clamping force to the exposed end of the screw 300.

[0067] Specifically, the drive unit 1 can drive the connecting part 2 to rotate. Compared to the method of using an open-end wrench to tighten the screw 300 by reciprocating within a certain fan-shaped area, the drive unit 1 itself does not need to rotate, thus not occupying the space on the outer periphery of the screw 300. This ensures the feasibility of operation when there are multiple screws 300 screwed onto the workpiece 200 and exposed, i.e., the operating area is limited. The connecting part 2 has a cylindrical structure. The first end of the connecting part 2 extends into the drive unit 1, and the second end of the connecting part 2 is screwed to the end of the screw 300 exposed on the workpiece 200. The first end of the connecting part 2 can be driven by the drive unit 1 to make the connecting part 2 rotate. It should be noted that the connecting part 2 does not occupy the space on the outer periphery of the screw 300 when it rotates; that is, the connecting part 2 rotates along its own area.

[0068] Additionally, a push rod 21 is provided inside the connecting part 2 along the axial direction of the screw 300. The push rod 21 is a cylindrical rod, and it is positioned corresponding to the exposed end of the screw 300. The driving part 1 includes a hydraulic drive unit 12, which applies pressure along the axial direction of the screw 300 to the push rod 21 inside the connecting part 2 to drive the push rod 21 to move within the connecting part 2. When the connecting part 2 is screwed to the screw 300, the hydraulic drive unit 12 is activated, causing the push rod 21 to move and abut against the exposed end of the screw 300, thereby... The pressure released by the hydraulic drive unit 12 generates a clamping force on the exposed end of the screw 300. It can be understood that when the screw 300 is screwed to the second end of the connecting part 2, the torque at the radial engagement point of the screw 300 and the connecting part 2 is less than the resistance torque at the screw connection point of the screw 300 and the threaded hole 204. The clamping force applied to the screw 300 in the axial direction can push the screw 300 so that the external thread on the surface of the screw 300 abuts against the internal thread of the connecting part 2 along the axial direction of the screw, thereby allowing the connecting part 2 to clamp the screw 300. Simultaneously, according to mechanical analysis, a positive pressure F is generated at the end of the screw 300, i.e., the clamping force F along the axial direction of the screw. The clamping force F is transmitted through the screw 300 to the threaded engagement point between the screw 300 and the connecting part 2. According to the bolt torque-axial force conversion formula T=kFd, after applying the clamping force F, the meshing torque at the thread is proportional to F. The meshing torque forms a rotational torque when the connecting part 2 drives the screw 300 to rotate (where T is the rotational torque of the screw 300 as it unscrews the workpiece 200, T1 is the resistance torque, k is the torque coefficient, and d is the nominal diameter of the thread; k and d remain unchanged for the same type of screw 300). Therefore, as F increases, the clamping force generated by the push rod 21 increases the rotational torque of the connecting part 2. When T=kFd>T1, the rotational torque is greater than the resistance torque. At the same time as the connecting part 2 clamps the screw 300, the connecting part 2 rotates, effectively driving the screw 300 to unscrew the threaded hole 204.

[0069] Understandably, compared to the existing technology where two nuts stacked together are prone to loosening when clamping the screw 300, the clamping force applied by the drive unit 1 can continuously clamp the screw 300 with the connecting part 2, preventing the screw 300 from loosening when the connecting part 2 rotates, i.e., preventing the connecting part 2 from spinning freely. At the same time, the connecting part 2 is driven to rotate by the drive unit 1, which is more automated and simpler and less labor-intensive than tightening the screw 300 with an open wrench.

[0070] In this embodiment, the drive unit 1 further includes a rotary drive unit 11, which includes a gripping part 111 and a receiving part 113. The receiving part 113 has a receiving hole 112, and the first end of the connecting part 2 extends into the receiving hole 112. The gripping part 111 includes a drive module (not shown in the figure), which drives the receiving part 113 to rotate. The hydraulic drive unit 12 is disposed on the gripping part 111, and the hydraulic drive unit 12 drives the push rod 21 to abut against the exposed end of the screw 300.

[0071] Specifically, the gripping part 111 is a rod, and its end is provided with a receiving part 113. A receiving hole 112 is opened at the axis of the receiving part 113. The first end of the connecting part 2 extends into the receiving hole 112, and the wall of the receiving hole 112 is in contact with the outer surface of the first end of the connecting part 2, so that when the driving module drives the receiving part 113 to rotate, the connecting part 2 rotates accordingly. The driving module is disposed in the gripping part 111, and the output end of the driving module is in contact with the outer surface of the receiving part 113, so as to drive the receiving part 113 to rotate. The hydraulic driving unit 12 is disposed on the gripping part 111 and is located near the first end of the connecting part 2. The hydraulic driving unit 12 drives the push rod 21 to abut against the exposed end of the screw 300.

[0072] In use, firstly, the drive unit 1 drives the connecting part 2 to rotate in the direction of tightening with the exposed end of the screw 300, thereby screwing the exposed end of the screw 300 to the second end of the connecting part 2; secondly, the drive unit 1 is turned on so that the drive unit 1 supplies clamping force to the push rod 21 in the connecting part 2, thereby pushing the push rod 21 to abut against the exposed end of the screw 300, so that the connecting part 2 clamps the screw 300; finally, the drive unit 1 drives the connecting part 2 to rotate in the direction of screw 300 unscrewing out of the threaded hole 204, so as to unscrew the screw 300 out of the workpiece 200. After unscrewing, the hydraulic drive unit 12 is disconnected so that the clamping force disappears, the torque of the connecting part 2 meshing with the screw 300 is reduced, and the operator can manually unscrew the screw 300 out of the connecting part 2, thus completing the disassembly of the screw 300, which is screwed into the workpiece 200 at one end and exposed at the other end.

[0073] In this embodiment, the receiving hole 112 is any one of a hexagonal hole, a square hole, or a spline hole. The first end of the connecting part 2 is embedded in the receiving hole 112, and the outer surface of the first end of the connecting part 2 is in contact with the hole wall of the receiving hole 112.

[0074] Specifically, the gripping part 111 is provided with a mounting part 3 on the outer periphery of the receiving part 113. The receiving part 113 has a cylindrical structure and is rotatably connected to the mounting hole of the mounting part 3. The drive module extends out from the hole wall of the mounting hole and contacts the outer surface of the receiving part 113. The shape of the receiving hole 112, that is, the hole for contacting the outer surface of the first end of the connecting part 2, is any one of a hexagonal hole, a square hole, or a spline hole. It can be understood that hexagonal holes and square holes are irregular holes in the prior art, while spline holes are holes whose wall surfaces are machined in the prior art for lifting holes. Similarly, the outer surface of the first end of the connecting part 2, that is, the outer surface cross-section for contacting the receiving hole 112, is also any one of a hexagonal hole, a square hole, or a spline hole. In this way, when the first end of the connecting part 2 is inserted into the receiving hole 112, the friction between the receiving hole 112 and the first end of the connecting part 2 is increased, ensuring that the driving part 1 can smoothly drive the connecting part 2 to rotate. At the same time, the rotational torque of the connecting part 2 can be effectively transmitted to the screw 300 clamped by the connecting part 2, preventing the receiving part 113 from spinning freely while the connecting part 2 does not rotate.

[0075] In other embodiments, the outer surface of the first end of the connecting part 2 engages with the wall of the receiving hole 112. For example, the outer surface of the first end of the connecting part 2 has a protrusion in the radial direction, and a groove is provided on the wall of the receiving hole 112 corresponding to the protrusion. Alternatively, the outer surface of the first end of the connecting part 2 has a groove in the radial direction, and a protrusion is provided on the wall of the receiving hole 112 corresponding to the groove. The groove and the protrusion engage, thereby ensuring the friction at the contact point between the receiving hole 112 and the first end of the connecting part 2, so as to realize the rotation of the receiving hole 112 and drive the connecting part 2 to rotate.

[0076] In this embodiment, the connecting part 2 includes a sleeve 20. The sleeve 20 has an internal threaded hole 201, a first mounting hole 202 and a second mounting hole 203 connected sequentially along its own axial direction. The screw 300 is screwed to the internal threaded hole 201. The first mounting hole 202 is used to accommodate the push rod 21 and the second mounting hole 203 is used to accommodate the end cap 22. The end cap 22 is connected to the hydraulic drive unit 12. When the hydraulic drive unit 12 is turned on, the hydraulic drive unit inputs a pressurizing medium into the first mounting hole 202 through the end cap 22 and pushes the push rod 21 to abut against the exposed end of the screw 300 through the pressurizing medium.

[0077] Specifically, the sleeve 20 has a cylindrical structure, and its interior is provided with interconnected internal threaded holes 201, a first mounting hole 202, and a second mounting hole 203 along its axial direction. The internal threaded hole 201 is used to screw onto the end of the screw 300 that protrudes from the workpiece 200. The first mounting hole 202 is located between the second mounting hole 203 and the internal threaded hole 201, and is used to accommodate the push rod 21. The second mounting hole 203 is located near the first end of the connecting portion 2, i.e., near the first end of the sleeve 20. The second mounting hole 203 has internal threads, and the end cap 22 has a cylindrical structure and is screwed onto the second mounting hole 203 to ensure the sealing of the area where the second mounting hole 203 is located. It is understood that the hydraulic drive unit 12 is connected to the first mounting hole 202 through the end cap 22. When the hydraulic drive unit 12 is turned on, the pressurizing medium flows from the hydraulic drive unit 12 through the end cap 22 and enters the first mounting hole 202, so as to accumulate in the first mounting hole 202 and push the push rod 21 to move in the first mounting hole 202. The push rod 21 can extend from the first mounting hole 202 into the internal threaded hole 201. The end cap 22 is sealed to the second mounting hole 203, and the side wall of the push rod 21 is sealed to the hole wall of the first mounting hole 202, so as to prevent the pressurizing medium from leaking when it enters the first mounting hole 202. The pressurizing medium can continuously provide pressure for the push rod 21 to move, i.e., maintain pressure, to prevent the screw 300 from being loosened when the connecting part 2 rotates, causing the connecting part 2 to spin freely.

[0078] In this embodiment, the hydraulic drive unit 12 is connected to the connecting part 2 and delivers a pressurizing medium to the first end of the connecting part 2 through the hydraulic drive unit 12. The pressurizing medium is a liquid. In other embodiments, the pressurizing medium can also be a gas, which is prior art and will not be described in detail here. After the pressurizing medium is input into the connecting part 2, since the pressurizing medium has a certain volume and occupies the internal space of the connecting part 2, the pressurizing medium accumulates and can push the push rod 21 toward the end of the screw 300 and continuously abut against the end of the screw 300. Compared with the method of setting a transmission mechanism or linkage mechanism along the axial direction of the screw 300 to drive the push rod 21 to move, less axial space is occupied.

[0079] Furthermore, in this embodiment, the first mounting hole 202 is a stepped hole, and the push rod 21 is provided with a protrusion 211 in the radial direction. The protrusion 211 is used to abut against the stepped surface 2021 of the stepped hole to limit the movement distance of the push rod 21.

[0080] Specifically, the first mounting hole 202 is a stepped hole. The larger stepped hole is connected to the second mounting hole 203, and the smaller stepped hole is connected to the internal threaded hole 201. The protrusion 211 is a cylindrical structure and is coaxially arranged with the push rod 21. The protrusion 211 and the push rod 21 are integrally formed, and the protrusion 211 is located at the end of the push rod 21 facing the second mounting hole 203. The protrusion 211 fits against the wall of the larger stepped hole so that when the pressurizing medium enters the first mounting hole 202, it is in the area of ​​the larger stepped hole and pushes the push rod 21 with the protrusion 211 toward the end of the screw 300. Understandably, the other end of the push rod 21 extends into the smaller hole of the stepped hole and fits against the smaller hole wall to ensure sealing. The size of the protrusion 211 is larger than the diameter of the push rod 21. By setting the protrusion 211 to abut against the stepped surface 2021 of the stepped hole, the movement distance of the push rod 21 when moving in the first mounting hole 202 is limited, preventing the push rod 21 from extending out of the first mounting hole 202 and causing leakage of the pressurized medium. At the same time, it avoids excessive clamping force applied to the screw 300, which could damage the screw 300.

[0081] In this embodiment, the first mounting hole 202 also includes an elastic element 4, which is located between the stepped surface 2021 and the protrusion 211.

[0082] Specifically, the elastic element 4 is a spring in the prior art. The elastic element 4 is sleeved on the outer periphery of the push rod 21 and between the step surface 2021 and the protrusion 211. By setting the elastic element 4, when the hydraulic drive unit 12 is depressurized, the push rod 21 can be reset by the elastic element 4, that is, the push rod 21 no longer abuts against the exposed end of the screw 300, the clamping force applied by the push rod 21 to the exposed end of the screw 300 disappears, thereby reducing the rotational torque between the screw 300 and the connecting part 2, so that after the screw 300 is screwed out of the workpiece 200, the screw 300 removed from the workpiece 200 can be smoothly screwed out of the connecting part 2 by the operator's hand rotation.

[0083] In other embodiments, the elastic element 4 may also be a disc spring or other structure that can provide a restoring force, such as a shape memory metal element, which will not be described in detail here.

[0084] In this embodiment, the connecting part 2 further includes a connector 5. The connector 5 is sleeved on the first end of the end cover 22 and the end cover 22 can rotate relative to the connector 5. The connector 5 is connected to the hydraulic drive unit 12. The end cover 22 is provided with a first connecting hole 221 along its own axial direction. The first connecting hole 221 is connected to the first mounting hole 202. The end cover 22 is provided with a second connecting hole 222 along its own radial direction. An annular first connecting groove 223 is formed between the contact surface of the first end of the end cover 22 and the connector 5. The first connecting groove 223 surrounds the outer surface of the first end of the end cover 22. The first connecting groove 223 is connected to the second connecting hole 222. The pressurizing medium flows into the end cover 22 and into the first mounting hole 202 through the first connecting groove 223, the second connecting hole 222 and the first connecting hole 221.

[0085] Specifically, the end cap 22 is screwed into the second mounting hole 203, and the end cap 22 has a first connecting hole 221 in the axial direction to introduce the pressurizing medium into the first mounting hole 202 through the first connecting hole 221. The first end of the end cap 22 extends out of the second mounting hole 203, and a connector 5 is sleeved on the outer periphery of the first end of the end cap 22. The first end of the end cap 22 has a second connecting hole 222 in the radial direction. The first connecting hole 221 penetrates the axial direction of the end cap 22, and the second connecting hole 222 penetrates the radial direction of the first end of the end cap 22. In addition, an annular first connecting groove 223 is provided on the outer periphery of the first end of the end cap 22. The first connecting groove 223 communicates with the second connecting hole 222. The first connecting groove 223 is composed of two semi-circular grooves. One semi-circular groove is located on the outer surface of the first end of the end cap 22, and the opening of the semi-circular groove is away from the axis of the first end of the end cap 22. The other semi-circular groove is located on the surface of the connector 5 facing the end cap 22. The two semi-circular grooves interlock to form a sealed annular channel, namely the first connecting groove 223. It is understandable that the hydraulic drive unit 12 is connected to the end cover 22 through the connector 5. When the sleeve 20 where the end cover 22 is located is driven to rotate by the rotary drive unit 11, the end cover 22 rotates relative to the connector 5, while the connector 5 does not rotate. In order to ensure that the pressurizing medium can continuously enter the end cover 22 and the first mounting hole 202 during the rotation, two semi-circular grooves are set to interlock with each other. When the connector 5 and the end cover 22 rotate relative to each other, the hydraulic drive unit 12 supplies pressurizing medium to the end cover 22, and the pressurizing medium flows from the semi-circular groove of the connector 5 into the semi-circular groove of the first end of the end cover 22, and then continuously flows into the second connecting hole 222 and the first connecting hole 221. The annular channel is not affected by the rotation of the end cover 22, and the pressurizing medium can flow smoothly into the first mounting hole 202, continuously applying a clamping force to the push rod 21, that is, maintaining pressure, to ensure that the push rod 21 abuts against the exposed end of the screw 300.

[0086] In this embodiment, the connecting part 2 further includes a first sealing member 6 and a second sealing member 7. The first sealing member 6 is disposed on the hole wall of the first mounting hole 202 and contacts the side wall of the protrusion 211. The second sealing member 7 is disposed on the bottom of the second mounting hole 203 and contacts the second end of the end cap 22.

[0087] Specifically, the first sealing element 6 and the second sealing element 7 are sealing rings in the prior art. The second mounting hole 203 is provided with a receiving groove corresponding to the second end of the end cover 22. The second sealing element 7 is embedded in the receiving groove so that when the end cover 22 is screwed into the second mounting hole 203, the second sealing element 7 fits against the second end of the end cover 22, thereby improving the sealing performance of the second mounting hole 203 and preventing leakage of the pressurized medium. The larger hole wall inside the first mounting hole 202, that is, the hole wall of the protrusion 211, is also provided with a receiving groove. The first sealing element 6 is disposed in the receiving groove so that the first sealing element 6 always fits against the side wall of the protrusion 211 and forms a sealed cylinder inside the first mounting hole 202 to prevent leakage of the pressurized medium and improve the sealing performance of the connection part 2.

[0088] In this embodiment, the hydraulic drive unit 12 is any one of an electric hydraulic pump, a pneumatic hydraulic pump, or a manual hydraulic pump. The electric hydraulic pump, pneumatic hydraulic pump, or manual hydraulic pump is a pump body in the prior art, and this embodiment does not improve upon it. Through the above-mentioned pump body, the pressurized medium is pumped into the first mounting hole 202, thereby driving the push rod 21 to move.

[0089] In this embodiment, the drive module is any one of an electric drive device, a pneumatic drive device, or a pulse drive device. The electric drive device, pneumatic drive device, or pulse drive device are existing drive devices used to drive the receiving hole 112 to rotate. This embodiment does not improve upon them. Through the above-mentioned drive device, the connecting part 2 inside the receiving hole 112 is driven to rotate, and then, when the connecting part 2 and the drive part 1 are engaged to clamp the screw 300, the screw 300 is driven to rotate out of the threaded hole 204 of the workpiece 200.

[0090] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A screw disassembly tool for disassembling a screw with one end screwed inside a workpiece and the other end exposed, characterized in that, The screw disassembly tool includes: The connecting part has a second end for screwing the exposed end of the screw rod. The connecting part is provided with a push rod, which is used to contact the screw rod to apply force when the screw rod disassembly tool is assembled to the screw rod to be disassembled. The drive unit is rotatably connected to a first end of the connecting part, the first end of the connecting part being the end of the connecting part away from the screw. The drive unit includes a hydraulic drive unit capable of driving the push rod to move the push rod toward or away from the screw, thereby applying or removing a clamping force to the exposed end of the screw.

2. The screw disassembly tool as described in claim 1, characterized in that, The drive unit further includes a rotary drive unit, which includes a gripping part and a receiving part. The receiving part has a receiving hole, and the first end of the connecting part extends into the receiving hole. The gripping part includes a drive module, which drives the receiving part to rotate. The hydraulic drive unit is disposed on the gripping part, and the hydraulic drive unit drives the push rod to abut against the exposed end of the screw.

3. The screw disassembly tool as described in claim 2, characterized in that, The receiving hole is any one of a hexagonal hole, a square hole, or a spline hole. The first end of the connecting part is embedded in the receiving hole, and the outer surface of the first end of the connecting part is in contact with the hole wall of the receiving hole.

4. The screw disassembly tool as described in claim 2, characterized in that, The connecting part includes a sleeve and an end cap. The sleeve has an internal threaded hole, a first mounting hole and a second mounting hole arranged sequentially along its own axial direction. The screw is screwed to the internal threaded hole. The first mounting hole is used to accommodate the push rod and the second mounting hole is used to accommodate the end cap. The end cap is connected to the hydraulic drive unit. When the hydraulic drive unit is turned on, the hydraulic drive unit inputs a pressurizing medium into the first mounting hole through the end cap and pushes the push rod against the exposed end of the screw through the pressurizing medium.

5. The screw disassembly tool as described in claim 4, characterized in that, The first mounting hole is a stepped hole, and the push rod has a protrusion along its own radial direction. The protrusion is used to abut against the stepped surface of the stepped hole to limit the movement distance of the push rod.

6. The screw disassembly tool as described in claim 5, characterized in that, The first mounting hole also includes an elastic element, which is located between the stepped surface and the protrusion.

7. The screw disassembly tool as described in claim 4, characterized in that, The connecting part further includes a connector, which is sleeved on the first end of the end cap and the end cap is rotatable relative to the connector. The connector is connected to the hydraulic drive unit. The end cap is provided with a first connecting hole along its axial direction, which is connected to the first mounting hole. The end cap is provided with a second connecting hole along its radial direction. An annular first connecting groove is formed between the contact surface of the first end of the end cap and the connector. The first connecting groove surrounds the outer surface of the first end of the end cap. The first connecting groove is connected to the second connecting hole. The pressurizing medium flows into the end cap and into the first mounting hole through the first connecting groove, the second connecting hole and the first connecting hole.

8. The screw disassembly tool as described in claim 5, characterized in that, The connecting part further includes a first sealing element and a second sealing element. The first sealing element is disposed on the hole wall of the first mounting hole and contacts the side wall of the protrusion. The second sealing element is disposed on the bottom of the second mounting hole and contacts the second end of the end cap.

9. The screw disassembly tool as described in claim 2, characterized in that, The hydraulic drive unit is any one of an electric hydraulic pump, a pneumatic hydraulic pump, or a manual hydraulic pump.

10. The screw disassembly tool as described in claim 2, characterized in that, The drive module is any one of an electric drive device, a pneumatic drive device, or a pulse drive device.

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