Geological deep hole fishing device

Abstract

The utility model relates to the technical field of geological drilling and salvaging, in particular to a geological deep hole salvaging device which comprises a connector, a salvaging barrel is fixedly connected to the lower portion of the connector, and a plurality of clamping jaw mechanisms are evenly arranged on the outer side wall of the lower portion of the salvaging barrel at intervals along the circumference of the salvaging barrel. The clamping jaw mechanisms are used in cooperation and clamp drilling foreign matter in a geological deep hole, outer limiting mechanisms are installed on the outer side wall, on the outer side of the upper portion of each clamping jaw mechanism, of the fishing barrel body, and elastic control pieces are arranged in the through fishing cavity, on the inner side of each clamping jaw mechanism, of the fishing barrel body. The geological deep hole fishing device is simple in structure, easy to install, light, portable, easy to operate and control and low in overall machining cost; the problems that part of geological conditions are complex and falling objects in drill holes are difficult to salvage can be effectively solved, the salvage time is shortened, the salvage efficiency is improved, and therefore the method indirectly plays a positive role in controlling the construction progress and the production cost of an engineering project.

Description

Technical Field

[0001] The utility model relates to the technical field of geological drilling and salvaging, in particular to a special device which can be used in conjunction with a standard steel rope and is used to handle drilling accidents, in particular to a geological deep hole salvaging device. Background Art

[0002] At present, during the production operation of geological drilling rigs, it often happens that drilling tools, wire ropes, measuring ropes and other equipment fall into the borehole due to wear and tear, strong winds, and improper operation by workers, and need to be salvaged with special salvage tools.

[0003] Especially when foreign objects fall into the bare hole section of the borehole, it is necessary to speed up the handling of the accident to avoid the collapse of the borehole, which will cause the foreign objects to be buried, increase the difficulty of handling the accident, and cause economic losses.

[0004] However, currently, most commonly used salvage tools are machine-made, with complex structures and single functions, which cannot cope with diversified rope accidents, and are time-consuming and labor-intensive to install and disassemble.

[0005] In addition, for example, a drilling tool salvage device is disclosed in the patent document with patent publication number CN202451099U; it can be seen from the records in the patent document that when the drilling tool salvage device is working, the grab bucket is first opened to a certain opening, and after the drilling tool enters the space formed by the grab bucket opening, the grab bucket is closed. When the grab bucket grasps the drilling tool, the positioning element is driven to fix the grab bucket position, and then the grab bucket and the drilling bucket are pulled out of the pile hole at the same time through the lifting action of the lifting device to realize the drilling tool salvage, and the expansion and contraction of the cylinder is controlled to drive the displacement of the grab bucket. This claw method not only requires the cylinder to provide the execution power, but also needs to be configured with an adaptive length valve air pipe line when it is suitable for deep hole salvage. The overall line layout is relatively complex and will occupy a certain space in the hole at the same time. There are problems in the grabbing range that the opening range is limited and the grabbing effect is poor.

[0006] To this end, the utility model optimizes and improves the problems of salvage in geological deep hole conditions in the prior art, and hereby proposes a special salvage device that can be used in conjunction with a standard steel rope and used to deal with drilling accidents, so as to better solve the problems existing in the prior art. Utility Model Content

[0007] The utility model is to solve one of the above-mentioned technical problems, and the technical solution adopted is: a geological deep hole salvage device, including a connecting joint, the upper part of the connecting joint is used to be connected with a matching standard steel rope or a matching drilling rig drill rod, the lower part of the connecting joint is fixedly connected with a salvage cylinder, and a plurality of claw mechanisms are evenly spaced along the circumference of the lower outer wall of the salvage cylinder, each of the claw mechanisms is used in cooperation to complete the clamping of drilling foreign bodies inside the geological deep hole, and an external limiting mechanism is respectively installed on the outer wall of the salvage cylinder outside the upper part of each of the claw mechanisms, and an elastic control member is respectively arranged inside the through salvage cavity of the salvage cylinder inside each of the claw mechanisms, and each of the elastic control members is respectively used to control the return of the claw mechanism at the current position.

[0008] The hook portion is a vertically shaped member which is adapted to engage the bottom surface of the fishhook and to engage with the bottom surface of the fishhook.

[0009] In any of the above schemes, preferably, the external limit mechanism includes two positioning screws which are symmetrically fixed and welded on both sides of the upper part of the vertical open long groove at corresponding positions, and a limit adjustment plate seat is arranged between the two positioning screws, and both ends of the limit adjustment plate seat are movably connected to the corresponding external threaded side walls of the positioning screws through mounting holes arranged thereon, and locking nuts are respectively screwed on the external threaded side walls of the positioning screws at the upper and lower parts of the two ends of the limit adjustment plate seat, and the two relatively arranged locking nuts cooperate to achieve locking positioning of the corresponding ends of the limit adjustment plate seat, and the upper end outer side wall of the straight part of the fishhook-shaped claw abuts against the middle inner side wall of the limit adjustment plate seat at the corresponding position.

[0010] In any of the above schemes, preferably, the elastic control member includes an elastic spring arranged on the inner side of the corresponding vertical opening long slot and penetrating the inside of the salvage cavity, the upper end of the elastic spring is fixedly arranged relative to the inner wall of the salvage cylinder above the vertical opening long slot, and the lower end of the elastic spring is fixedly arranged relative to the inner wall of the straight portion of the fishhook-shaped claw on the inner side of the vertical opening long slot.

[0011] In any of the above solutions, it is preferred that each of the elastic springs is in a vertical setting state or a setting state with the lower end tilted inwards in a natural state.

[0012] In any of the above solutions, it is preferred that the straight portion of the fishhook-shaped claw and the hook portion are an integrally formed fixed structure.

[0013] In any of the above schemes, preferably, lateral welding seats are symmetrically fixedly arranged on both sides of each stud, and both ends of the stud are screwed through the threaded through hole in the center of the lateral welding seat at the corresponding position through external threads.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] 1. The geological deep hole salvage device in the utility model has a simple structure, is easy to install, is lightweight and portable, is easy to operate and has a low overall processing cost. It can effectively solve the problem that some geological conditions are relatively complex and objects in the borehole are difficult to salvage, reduce the salvage time, and improve the salvage efficiency, thereby indirectly playing a positive role in the construction progress of the project and the control of production costs, and is also of great significance to the development of the industry.

[0016] 2. When the geological deep hole salvage device in the utility model salvages foreign objects dropped in the borehole, the passive outward swing position of the three evenly distributed claw mechanisms can realize the opening and expansion adjustment of the lower part of each hook-shaped claw. At the same time, when the foreign object enters the through-hole salvage cavity, the whole device is lifted up to realize that the foreign object presses against the corresponding hook-shaped claw by its own weight, so that the lower end of each hook-shaped claw can be retracted inward according to the shape of the foreign object under the action of the elastic control member, thereby achieving the purpose of clamping the foreign object and improving the firmness of the clamping.

[0017] 3. Each external limit mechanism adopts an adjustable radial interval method, which can effectively achieve different limiting effects on the upper part of the claw mechanism at the current position, so that the outward expansion amplitude of the lower end of the claw mechanism can be adjusted as needed; in addition, each external limit mechanism adopts a structure that can be quickly disassembled, which is relatively quick and convenient when adjusting and replacing.

[0018] 4. Each claw mechanism is installed on the outer wall of the corresponding stud by screwing the nut. At the same time, both ends of the stud adopt a structure that can be quickly disassembled, which can ensure that the entire claw mechanism can be quickly replaced according to different needs of salvaging foreign objects, thereby improving the adaptability and versatility of the entire device during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the specific implementation of the utility model, the following will briefly introduce the drawings required for the specific implementation. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, each element or component is not necessarily drawn according to the actual scale.

[0020] Figure 1 This is a schematic structural diagram of Example 1 of the utility model.

[0021] Figure 2 It is a partial top view of the structure of Example 1 of the utility model.

[0022] Figure 3 It is a schematic diagram of a partial three-dimensional structure of Example 1 of the utility model.

[0023] Figure 4 It is a schematic diagram of a partial three-dimensional structure in a top view of Example 1 of the utility model.

[0024] Figure 5 for Figure 1 A schematic diagram of the partial internal cross-sectional structure of Example 1.

[0025] Figure 6 This is a schematic structural diagram of Example 2 of the present utility model.

[0026] Figure 7 It is a schematic diagram of the partial internal cross-sectional structure of Example 2 of the utility model.

[0027] Figure 8 It is a partial top view of the structure of Example 2 of the utility model.

[0028] In the figure, 1, connecting joint; 2, salvage cylinder; 3, through salvage cavity; 4, vertical opening long groove; 5, fishhook-shaped claw; 501, hook part; 502, straight part; 6, nut; 7, stud; 8, positioning screw; 9, limit adjustment plate seat; 10, elastic spring; 11, lateral welding seat; 12, locking nut; 13, horizontal spring; 14, connecting rod. DETAILED DESCRIPTION

[0029] The following is a detailed description of the embodiments of the technical solution of the utility model in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the scope of protection of the utility model. Figure 1-Figure 8 as shown in .

[0030] Embodiment 1: A geological deep hole salvage device comprises a connecting joint 1, the upper part of the connecting joint 1 is used to connect with a matching standard steel rope or a matching drilling rig drill rod, the lower part of the connecting joint 1 is fixedly connected with a salvage cylinder 2, and a plurality of claw mechanisms are evenly spaced along the circumference of the lower outer wall of the salvage cylinder 2, each of the claw mechanisms is used in cooperation to complete the clamping of drilled foreign bodies inside the geological deep hole, and an external limiting mechanism is respectively installed on the outer wall of the salvage cylinder 2 outside the upper part of each of the claw mechanisms, and an elastic control member is respectively arranged inside the through salvage cavity 3 of the salvage cylinder 2 inside each of the claw mechanisms, and each of the elastic control members is respectively used to control the return of the claw mechanism at the current position.

[0031] The connection joint 1 in the device is a salvage joint, which adopts a φ65×100mm connection joint 1, which is fixedly connected to the salvage cylinder 2 by a thread at the bottom of the connection joint 1, and an external thread is arranged on the top to facilitate the connection of a standard steel rope joint. In addition, the salvage cylinder 2 adopts a φ73×300mm steel pipe, and the overall structural strength is relatively high.

[0032] The entire geological deep hole salvage device can be used in geological deep holes to effectively clamp foreign objects that fall inside them and cooperate with the lifting of external wire ropes to achieve rapid ascent and salvage of the clamped foreign objects, effectively ensuring the effect of salvaging and clamping clothes.

[0033] Among them, when clamping, multiple claw mechanisms can be used to clamp the foreign object at multiple points around it, effectively ensuring the stability of the clamped foreign object, improving the clamping effect, and reducing the risk of the foreign object falling off. Each claw mechanism adopts a large-scale adjustment method that can swing outward and inward independently, which can be used to flexibly give way when encountering passive push of foreign objects; of course, when it is necessary to lift the foreign object upward, the lower ends of each claw mechanism can be automatically gathered together by relying on the return of the elastic control parts configured on each claw mechanism and the downward pressure of the foreign object on the lower ends of each claw mechanism, so as to cooperate with the elastic force of the elastic control parts to achieve multi-point clamping of the clamped foreign object, improve the clamping effect, and ensure the firmness of the foreign object when lifting and salvaging the foreign object.

[0034] In any of the above schemes, it is preferred that the claw mechanism includes a vertical open long groove 4 arranged on the outer side wall of the lower part of the salvage cylinder 2, the vertical open long groove 4 connects the through salvage cavity 3 with the outside, the bottom of the vertical open long groove 4 is arranged through the bottom end of the salvage cylinder 2, and a vertically arranged fishhook-shaped claw 5 is respectively installed on the inner side of each of the vertical open long grooves 4, and the bottom of the fishhook-shaped claw 5 is provided with a hook portion 501, and the upper part of the fishhook-shaped claw 5 is a straight portion 502. A nut 6 is fixedly welded on the middle outer wall of the part 502, and the nut 6 is screwed on the outer threaded side wall of a horizontally arranged stud 7 through a thread. The stud 7 is detachably fixed on the outer side of the vertical opening long groove 4. The lower part of the straight part 502 of the fishhook-shaped claw 5 and the hook part 501 both extend to the bottom of the salvage cylinder 2, and the upper outer wall of the straight part 502 of the fishhook-shaped claw 5 passes through the corresponding vertical opening long groove 4 and abuts against the external limit mechanism at the corresponding position.

[0035] The claw mechanism designed in the utility model adopts a method in which the middle part relies on the nut 6 to be screwed on the external threaded side wall of the double-headed stud 7 to realize that the fishhook-shaped claw 5 of the entire claw mechanism can realize fixed-axis swing when the lower end is subjected to lateral external force, thereby realizing the expansion or contraction of the lower end, thereby achieving the giving way of foreign objects or lifting up the foreign objects by relying on the dead weight of the foreign objects and the pullback tensioning of the elastic control part to complete the gathering of the fishhook-shaped claw 5 and realize the clamping of the foreign objects.

[0036] By screwing the stud 7, the entire claw mechanism can be quickly disassembled, which is convenient for quickly replacing the matching claw mechanisms according to different foreign objects. The overall replacement operation is relatively fast and flexible.

[0037] In any of the above schemes, it is preferred that the external limit mechanism includes two positioning screws 8 which are symmetrically fixed and welded on both sides of the upper part of the vertical open long groove 4 at corresponding positions, and a limit adjustment plate seat 9 is arranged between the two positioning screws 8. Both ends of the limit adjustment plate seat 9 are movably connected to the corresponding external threaded side walls of the positioning screw 8 through mounting holes arranged thereon, and locking nuts 12 are respectively screwed on the external threaded side walls of the positioning screw 8 at the upper and lower parts of the two ends of the limit adjustment plate seat 9, and spot welding is performed on the screwing-in parts to prevent them from falling off. The two relatively arranged locking nuts 12 cooperate to achieve the locking positioning of the corresponding ends of the limit adjustment plate seat 9, and the upper end outer side wall of the straight portion 502 of the fishhook-shaped claw 5 abuts against the middle inner side wall of the limit adjustment plate seat 9 at the corresponding position.

[0038] The main function of the external limit mechanism is to limit the maximum outward movement of the upper end of the fishhook-shaped claw 5, so as to indirectly control the inward gathering range of the lower end of the fishhook-shaped claw 5; in actual use, the four locking nuts 12 at both ends of the corresponding limit adjustment plate seat 9 can be appropriately adjusted according to the size of the foreign object to be clamped, so as to achieve the purpose of controlling the entire limit adjustment plate seat 9 to move inward or outward and then quickly lock and position it, thereby achieving different limit amplitude control.

[0039] In addition, the entire limit adjustment plate seat 9 can also be quickly replaced with different shapes according to needs by removing the locking nut 12. The overall versatility is strong and the replacement is quick and convenient.

[0040] In any of the above schemes, it is preferred that the elastic control member includes an elastic spring 10 arranged inside the salvage cavity 3 on the inner side of the corresponding vertical opening long slot 4, the upper end of the elastic spring 10 is fixedly arranged relative to the inner wall of the salvage cylinder 2 above the vertical opening long slot 4, and the lower end of the elastic spring 10 is fixedly arranged relative to the inner wall of the straight portion 502 of the fishhook-shaped claw 5 on the inner side of the vertical opening long slot 4.

[0041] The elastic spring 10 is in a naturally extended state under normal conditions. When the lower end of the fishhook-shaped claw 5 is in a stretched state under the action of foreign matter, the elastic spring 10 is in an extended state. Therefore, under the action of its spring reaction force, the fishhook-shaped claw 5 will be pulled inward, thereby achieving the purpose of clamping the foreign matter and ensuring the firmness of the clamping of the foreign matter. In conjunction with the lifting wire rope, the entire device and the clamped foreign matter can be salvaged and removed.

[0042] In any of the above solutions, preferably, each of the elastic springs 10 is in a vertical setting state or a setting state with the lower end tilted inward in a natural state. The natural working state of the elastic spring 10 can be installed and set as needed.

[0043] In any of the above solutions, it is preferred that the straight portion 502 and the hook portion 501 of the fishhook-shaped claw 5 are an integrally formed and fixedly connected structure.

[0044] The integrally formed fixed connection structure can effectively ensure the strength of the entire fishhook-shaped claw 5 structure and ensure its effect in clamping foreign objects.

[0045] In any of the above schemes, it is preferred that lateral welding seats 11 are symmetrically fixed on both sides of each of the studs 7, and both ends of the studs 7 are screwed through the threaded through holes in the centers of the lateral welding seats 11 at corresponding positions through external threads, and spot welding is performed at the welding positions to prevent them from falling off.

[0046] The stud bolt 7 as a whole can be quickly screwed together and disassembled, which can ensure the quick disassembly of the entire claw mechanism and can better select a suitable claw mechanism for replacement or installation according to needs.

[0047] Example 2: The difference from Example 1 is that the installation form of the elastic control member and the initial state of the claw mechanism in this example are different from those in Example 1.

[0048] The elastic control member includes a horizontal spring 13 horizontally arranged on the inner side of the corresponding vertical open long groove 4 and penetrating the inside of the salvage cavity 3. The outer end of the horizontal spring 13 is fixedly arranged relative to the inner wall of the salvage cylinder 2, and the inner end of the horizontal spring 13 is fixedly arranged relative to the inner wall of the upper section of the straight portion 502 of the fishhook-shaped claw 5. A connecting rod 14 is fixed to the outer side of the middle section of the straight portion 502 of the fishhook-shaped claw 5, and the outer end of the connecting rod 14 is fixedly connected to the side wall of the nut 6 at the corresponding position. The fishhook-shaped claw 5 is a swing fulcrum through the rotation cooperation of the nut 6 and the stud 7, with the connecting rod 14 as a connecting arm.

[0049] The lower end of the straight portion 502 of the fishhook-shaped claw 5 is tilted inwards in a normal state.

[0050] Under normal conditions, the lower end of the straight portion 502 of the fishhook-shaped claw 5 is tilted inward to ensure the clamping effect when clamping foreign objects; at the same time, relying on the expansion and contraction of the horizontal spring 13 arranged horizontally, it can better ensure that it cooperates with the inward or outward swinging deformation of the lower end of the fishhook-shaped claw 5, thereby improving its expansion capacity and ensuring its matching degree when salvaging foreign objects.

[0051] The specific implementation methods of this device are divided into two types according to the accident situation: one is manual operation method and the other is mechanical operation method.

[0052] 1. Manual operation method and working principle:

[0053] ①First, connect the upper part of the salvage device to the standard steel rope string;

[0054] ② Slowly lower the salvage device to the bottom of the borehole manually again;

[0055] ③ Lift the salvage device upwards to about 30m from the bottom, and lower it into the hole again; lift it up and down several times. By swinging the steel rope and the salvage device in the hole, the fishhook-shaped claw 5 can catch and remove the foreign matter in the hole.

[0056] Working principle: When the salvaging device touches a foreign object, the reaction force exerted by the foreign object on the salvaging device can open the claws of the salvaging device through the elastic control member; when lifted upward, the gravity of the foreign object acting on the fishhook-shaped claw 5 closes it through the elastic control member, firmly grasps the foreign object and fishes it out.

[0057] 2. Mechanical operation method and working principle:

[0058] ① First, connect the upper part of the salvage device to the drill pipe of the drilling rig;

[0059] ②Use the drilling tool to slowly lower the salvage device to the bottom of the borehole;

[0060] ③ Slowly rotate the drill bit to lift the salvage device upwards to a distance greater than the length of the foreign object, and then lower it into the bottom of the hole again; lift it up and down several times. The foreign objects in the hole can be caught and fished out by the fishhook-shaped claws 5 at the bottom of the salvage device.

[0061] Working principle: When the salvage device touches a foreign object, the reaction force exerted by the foreign object on the salvage device can cause the lower ends of the fishhook-shaped claws 5 of the salvage device to open outward through the elastic control member; as the drill bit slowly rotates, the bottom of the salvage device will lock the foreign object. When lifting upward, the self-weight of the foreign object acting on the fishhook-shaped claws 5 closes the claws through the elastic control member. Under the cooperation of the fishhook-shaped claws 5 at the bottom of the salvage device, the foreign object can be firmly grasped and salvaged.

[0062] 3. Applicable conditions:

[0063] When the borehole is shallow, the rock formation is well-integrity, and the foreign objects in the borehole are small, such as wire ropes, measuring ropes, and borehole peep instruments, manual operation should be adopted. When the borehole is deep, there are many rock formation fracture zones, and the foreign objects in the borehole are complex in shape, such as drill rods, joints, drill bits, etc., mechanical operation should be adopted.

[0064] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model. For technicians in this technical field, any replacement improvements or changes made to the implementation methods of the utility model fall within the protection scope of the utility model.

[0065] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A geological deep hole salvage device, comprising a connecting joint, the upper part of which is used to connect with a matching standard steel rope or a matching drilling rig drill rod, characterized in that: A salvage cylinder is fixedly connected to the lower portion of the connecting joint, and a plurality of claw mechanisms are evenly spaced along the circumference of the lower outer wall of the salvage cylinder. The claw mechanisms cooperate to clamp foreign bodies drilled in the geological deep hole, and external limiting mechanisms are respectively installed on the outer wall of the salvage cylinder outside the upper portion of each claw mechanism, and elastic control members are respectively arranged inside the through salvage cavity of the salvage cylinder inside each claw mechanism, and each elastic control member is used to control the return of the claw mechanism at the current position.

2. A geological deep hole salvage device according to claim 1, characterized in that: The claw mechanism comprises a vertical open long groove arranged on the outer side wall of the lower part of the salvage cylinder body, the vertical open long groove connects the through salvage cavity with the outside, the bottom of the vertical open long groove passes through the bottom end of the salvage cylinder body, and a vertically arranged fishhook-shaped claw is respectively installed on the inner side of each of the vertical open long grooves, and a hook portion is arranged at the bottom of the fishhook-shaped claw, and the upper part of the fishhook-shaped claw is a straight portion, and a nut is fixedly welded on the middle outer side wall of the straight portion, and the nut is screwed on the outer threaded side wall of a horizontally arranged double-headed stud through a thread, and the double-headed stud is detachably fixed on the outer side of the vertical open long groove, and the lower part of the straight part of the fishhook-shaped claw and the hook portion both extend to the bottom of the salvage cylinder body, and the upper outer side wall of the straight part of the fishhook-shaped claw passes through the corresponding vertical open long groove and abuts against the outer limit mechanism at the corresponding position.

3. A geological deep hole salvage device according to claim 2, characterized in that: The external limit mechanism includes two positioning screws which are symmetrically fixed and welded on both sides of the upper part of the vertical opening long groove at corresponding positions, and a limit adjustment plate seat is arranged between the two positioning screws, and both ends of the limit adjustment plate seat are movably connected to the corresponding external threaded side walls of the positioning screw through the mounting holes arranged thereon, and locking nuts are respectively screwed on the external threaded side walls of the positioning screws at the upper and lower parts of the two ends of the limit adjustment plate seat, and the two relatively arranged locking nuts cooperate to realize the locking positioning of the corresponding ends of the limit adjustment plate seat, and the upper end outer side wall of the straight part of the fishhook-shaped claw abuts against the middle inner side wall of the limit adjustment plate seat at the corresponding position.

4. A geological deep hole salvage device according to claim 3, characterized in that: The elastic control component includes an elastic spring that is arranged on the inner side of the corresponding vertical opening long slot and passes through the salvage cavity. The upper end of the elastic spring is fixedly arranged relative to the inner wall of the salvage cylinder above the vertical opening long slot, and the lower end of the elastic spring is fixedly arranged relative to the inner wall of the straight portion of the fishhook-shaped claw on the inner side of the vertical opening long slot.

5. A geological deep hole salvage device according to claim 4, characterized in that: The straight portion of the fishhook-shaped claw and the hook portion are an integrally formed fixed structure.

6. A geological deep hole salvage device according to claim 5, characterized in that: Lateral welding seats are symmetrically fixedly arranged on both sides of each stud, and both ends of the stud are screwed through the threaded through hole in the center of the lateral welding seat at the corresponding position through external threads.

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