Shear pin puller with high safety

Abstract

The utility model discloses a high safety's shearing pin pull -out tool relates to mechanical engineering technical field. The high safety's shearing pin pull -out tool, include: roof, the middle of roof is provided with the bush, the lower surface left and right sides of roof are fixedly connected with support, the support is used for supporting the shearing pin above of being pulled out, the inside of shearing pin is provided with through -hole, the inside insertion of bush has screw rod, the lower end of screw rod is connected with the ejection bolt through screw thread, the upper end fixedly connected with fixed handle of screw rod, the upper end of screw rod is connected with the lifting handle through screw thread. The high safety's shearing pin pull -out tool, only need to set up the roof and the support in the both sides of the upper end of shearing pin, again, the lifting handle is equipped in the outside of screw rod, the other end of screw rod inserts shearing pin and rotates the ejection bolt in the end, only need to hold the fixed handle with one hand, and the lifting handle is rotated downward with the other hand, and shearing pin can be ejected.

Description

Technical Field

[0001] This utility model relates to the field of mechanical engineering technology, specifically a highly safe shear pin pull-out tool. Background Technology

[0002] When a turbine closes its guide vane mechanism, foreign objects such as wood may become stuck between the two guide vanes, preventing the mechanism from closing. To ensure that other guide vanes can close without damaging the transmission mechanism, a fragile shear pin device is installed on the guide vane arm. When a foreign object is stuck between the guide vanes, the guide vane shaft and guide vane arm cannot move, while the connecting plate rotates under the drive of the fork head. This generates a shear force on the shear pin. When this shear force exceeds 1.5 times the normal operating stress, the shear pin breaks, and that guide vane is released from control. However, the other guide vanes can still rotate normally, preventing the accident from escalating. Therefore, if a shear pin breaks during turbine generator operation, the turbine must be stopped immediately. When a shear pin breaks during unit operation, the governor's main oil supply valve must be shut off. First, use a flat chisel or similar tool to pull the upper part of the broken shear pin out of the main crank arm hole. Then, use a jack to align the misaligned guide vane main and auxiliary crank arm shear pin mounting holes. Finally, use a copper rod and a sledgehammer to hammer the lower part of the broken shear pin out from under the guide vane auxiliary crank arm. However, the shear pin installation location is in a poor environment; in long-term low-temperature and humid conditions, the shear pin is prone to rusting. Replacing the shear pin requires a significant amount of time to remove the broken piece. Furthermore, during the removal of the lower part of the broken shear pin, one person must hold the copper rod while another uses a sledgehammer to strike it. If the sledgehammer is used improperly or slips, it could potentially injure the person holding the copper rod. Therefore, a highly safe shear pin removal tool is designed to solve these problems. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this utility model provides a highly safe tool for removing broken shear pins. This tool solves the problem that during the process of removing the lower part of a broken shear pin, one person needs to hold the copper rod while another person uses a sledgehammer to strike it. If the sledgehammer is used improperly or slips, it could potentially injure the person holding the copper rod.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model provides a highly secure shear pin extraction fixture, comprising: a top plate with an insertion hole in the middle; brackets fixedly connected to the left and right sides of the lower surface of the top plate, the brackets supporting the shear pin to be extracted; a through hole inside the shear pin; a lead screw inserted into the insertion hole; the lower end of the lead screw passing through the through hole inside the shear pin and extending to the lower end; an ejector bolt threadedly connected to the lower end of the lead screw and located at the lower end of the shear pin; the inscribed circle diameter of the ejector bolt being larger than the diameter of the insertion hole and the through hole inside the shear pin; a fixed handle fixedly connected to the upper end of the lead screw; and a lifting handle threadedly connected to the upper end of the lead screw.

[0008] Preferably, a planar bearing is provided between the lifting handle and the top plate, and the inner diameter of the planar bearing is larger than the major diameter of the lead screw thread.

[0009] Preferably, the length of the lead screw is more than 2.5 times the length of the shear pin.

[0010] Preferably, the major diameter of the lead screw thread is smaller than the diameter of the insertion hole and the through hole inside the shear pin.

[0011] Preferably, the bracket includes an inner rod whose upper end is fixedly connected to the upper end of the top plate, and the lower end of the inner rod is threaded on the outer side, and an outer sleeve is threadedly connected to the lower end of the inner rod.

[0012] Preferably, the threads on both the lead screw and the outer side of the inner rod are coarse threads.

[0013] Preferably, the outer sleeve and the top plate are both made of carbon steel.

[0014] (III) Beneficial Effects

[0015] This utility model provides a highly secure shear pin removal tool, which has at least the following advantages compared with the prior art:

[0016] This highly secure shear pin removal tool only requires placing the top plate and bracket on both sides of the upper end of the shear pin, then placing the lifting handle glove on the outside of the lead screw, inserting the other end of the lead screw into the shear pin, and rotating the end to push out the bolt. You only need to hold the fixed handle with one hand and rotate the lifting handle downwards with the other hand to push out the shear pin. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This utility model Figure 1 A sectional view;

[0019] Figure 3 This is an anatomical view of the present invention;

[0020] Figure 4 This utility model Figure 3 A sectional view.

[0021] In the diagram: 1. Top plate; 2. Insertion hole; 3. Bracket; 4. Shear pin; 5. Lead screw; 6. Ejector bolt; 7. Fixed handle; 8. Lifting handle; 21. Surface bearing; 31. Inner rod; 32. Outer sleeve. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4 This utility model provides a technical solution: a high-safety shear pin extraction fixture, comprising: a top plate 1, an insertion hole 2 in the middle of the top plate 1, brackets 3 fixedly connected to the left and right sides of the lower surface of the top plate 1, the brackets 3 being used to support the shear pin 4 to be extracted, a through hole in the shear pin 4, a lead screw 5 inserted into the insertion hole 2, the lower end of the lead screw 5 passing through the through hole in the shear pin 4 and extending to the lower end, an ejector bolt 6 threadedly connected to the lower end of the lead screw 5 and located at the lower end of the shear pin 4, the inscribed circle diameter of the ejector bolt 6 being larger than the diameter of the insertion hole 2 and the through hole in the shear pin 4, a fixing handle 7 fixedly connected to the upper end of the lead screw 5, and a lifting handle 8 threadedly connected to the upper end of the lead screw 5.

[0024] In use, remove the burrs from the opening of the shear pin 4. Then, place the bracket 3 on both sides of the base where the shear pin 4 is installed, aligning the middle position with the middle position of the shear pin 4. First, screw the lower end of the lead screw 5 onto the lifting handle 8 until the upper end of the lead screw 5 is reached. Then, the lower end of the lead screw 5 passes through the insertion hole 2 in the middle of the top plate 1 and the through hole inside the shear pin 4, extending to the lower end of the shear pin 4. Next, fit the protruding part of the lower end of the lead screw 5 onto the ejector bolt 6. Hold the fixing handle 7 with one hand to prevent the lead screw 5 from rotating on its own. Then, rotate the lifting handle 8 downwards. Since the lifting handle 8 and the lead screw 5 are connected by threads, and the lead screw 5 is fixed by the fixing handle 7, it will not rotate radially. The lower end of the lifting handle 8 is restricted by the upper end of the top plate 1, so that when the lifting handle 8 is rotated downwards, the lead screw 5 will slide upwards. The ejector bolt 6 will push the shear pin 4 upwards, thereby pushing the shear pin 4 out of the base.

[0025] like Figure 1-4As shown, this utility model embodiment provides an implementation method. Based on the above implementation method, a plane bearing 21 is provided between the lifting handle 8 and the top plate 1. The inner diameter of the plane bearing 21 is larger than the major diameter of the thread of the lead screw 5.

[0026] Analysis of the above structure shows that the lifting handle 8 is first sleeved on the outside of the lead screw 5, and then the plane bearing 21 is sleeved on the outside of the lead screw 5. After that, the installation is carried out according to the above steps. When the shear pin 4 is pushed out, the lower end of the lifting handle 8 will not rub against the upper surface of the top plate 1 because the plane bearing 21 blocks the lifting handle 8 from the top plate 1. This reduces the force of the friction and prevents wear on the contact surface between the top plate 1 and the lifting handle 8.

[0027] like Figure 1-4 As shown, this utility model embodiment provides an implementation method in which the length of the lead screw 5 is more than 2.5 times the length of the shear pin 4.

[0028] Analysis of the above structure shows that the length of the lead screw 5 is more than 2.5 times the length of the shear pin 4. This is because the length of the bracket 3 must be at least the same as the length of the shear pin 4 in order to remove the shear pin 4. In addition, considering the length of the shear pin 4 and the thickness of the rotating lifting handle 8 and the top plate 1, the length of the shear pin 4 must be at least 2.5 times.

[0029] like Figure 1-4 As shown, this utility model embodiment provides an implementation method in which the major diameter of the thread of the lead screw 5 is smaller than the diameter of the insertion hole 2 and the internal through hole of the shear pin 4.

[0030] Analysis of the above structure shows that the major diameter of the thread of the lead screw 5 is smaller than the diameter of the through hole inside the insertion hole 2 and the shear pin 4, which makes it convenient for the lead screw 5 to be inserted into the inside of the insertion hole 2 and the through hole inside the shear pin 4.

[0031] like Figure 1-4 As shown, this utility model embodiment provides an implementation method. Based on the above implementation method, the bracket 3 includes an inner rod 31 whose upper end is fixedly connected to the upper end of the top plate 1. The lower end of the inner rod 31 is threaded on the outer side, and the lower end of the inner rod 31 is threadedly connected to an outer sleeve 32.

[0032] Analysis of the above structure shows that when removing shear pins 4 of different lengths, the overall length of the bracket 3 can be increased by rotating the two outer sleeves 32 downwards to accommodate shear pins 4 of different lengths.

[0033] like Figure 1-4 As shown, this utility model embodiment provides an implementation method. Based on the above implementation method, the threads on the outer side of the lead screw 5 and the inner rod 31 are both coarse threads.

[0034] Analysis of the above structure shows that the threads on the outside of the lead screw 5 and the inner rod 31 are both coarse threads to ensure the strength of the threads.

[0035] like Figure 1-3 As shown, this utility model embodiment provides an implementation method. Based on the above implementation method, the outer sleeve 32 and the top plate 1 are both made of carbon steel.

[0036] Analysis of the above structure shows that the outer sleeve 32 and the top plate 1 are both made of carbon steel to ensure the strength of the outer sleeve 32 and the top plate 1.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-safety shear pin pull-out fixture, characterized in that, include: A top plate (1) is provided with an insertion hole (2) in the middle. A bracket (3) is fixedly connected to the left and right sides of the lower surface of the top plate (1). The bracket (3) is used to support the shear pin (4) to be pulled out. A through hole is provided inside the shear pin (4). A screw rod (5) is inserted into the insertion hole (2). The lower end of the screw rod (5) passes through the through hole inside the shear pin (4) and extends to the lower end. The lower end of the screw rod (5) and the lower end of the shear pin (4) are connected to an ejector bolt (6) by a thread. The inner circle diameter of the ejector bolt (6) is larger than the diameter of the insertion hole (2) and the through hole inside the shear pin (4). A fixed handle (7) is fixedly connected to the upper end of the screw rod (5). A lifting handle (8) is connected to the upper end of the screw rod (5) by a thread.

2. The high-safety shear pin pull-out fixture according to claim 1, characterized in that: A planar bearing (21) is provided between the lifting handle (8) and the top plate (1), and the inner diameter of the planar bearing (21) is larger than the major diameter of the thread of the lead screw (5).

3. The high-safety shear pin extraction fixture according to claim 1, characterized in that: The length of the lead screw (5) is more than 2.5 times the length of the shear pin (4).

4. The high-safety shear pin extraction fixture according to claim 1, characterized in that: The major diameter of the thread of the lead screw (5) is smaller than the diameter of the through hole inside the insertion hole (2) and the shear pin (4).

5. The high-safety shear pin extraction fixture according to claim 1, characterized in that: The bracket (3) includes an inner rod (31) whose upper end is fixedly connected to the upper end of the top plate (1). The lower end of the inner rod (31) is threaded on the outer side, and the lower end of the inner rod (31) is connected to an outer sleeve (32) by the thread.

6. The high-safety shear pin pull-out fixture according to claim 5, characterized in that: The threads on the outer sides of the lead screw (5) and the inner rod (31) are both coarse threads.

7. A high-safety shear pin extraction fixture according to claim 5, characterized in that: The outer sleeve (32) and the top plate (1) are both made of carbon steel.

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