Welding structure and tightening device

Abstract

The welding structure comprises a transmission outer sleeve and a transmission inner sleeve, the transmission inner sleeve is arranged in the transmission outer sleeve, the transmission outer sleeve can drive the transmission inner sleeve to rotate around the axis of the transmission outer sleeve, a through hole is formed in the transmission outer sleeve, the through hole is communicated with the inner side and the outer side of the transmission outer sleeve, and a groove is formed in the transmission inner sleeve. The groove is communicated with the penetrating hole, the penetrating hole and the groove are filled with metal filler, and the transmission outer sleeve and the transmission inner sleeve are welded together by heating the metal filler; the tightening device comprises a rotary driving device, a transmission shaft, a screwing head and the welding structure, one end of the transmission shaft is inserted into the transmission inner sleeve in a sliding mode, the other end of the transmission shaft is connected with the screwing head, the rotary driving device can drive the transmission outer sleeve to rotate forwards or reversely, and then the transmission shaft and the screwing head are driven to rotate through the transmission inner sleeve. The welding structure can bear large torque, and the phenomenon that the welding position is fractured during rotation is avoided.

Description

Technical Field

[0001] The utility model relates to the field of electrolytic aluminum auxiliary equipment, and specifically relates to a welding structure and a tightening and loosening device. Background Technique

[0002] In the electrolytic aluminum process, the anode busbar is connected to the guide rod through an anode clamp. The anode clamp is fixed on the anode busbar, and the anode clamp presses the guide rod against the anode busbar. The guide rod extends into the electrolytic cell. During the electrolysis process, the anode material on the guide rod will be gradually consumed. To ensure the continuous progress of electrolysis, the guide rod will gradually move downward to compensate for this electrolytic consumption. During the gradual downward movement of the guide rod, the anode busbar follows the guide rod downward. When the anode busbar moves downward a certain distance, it is necessary to lift the anode busbar upward relative to the guide rod, and a busbar lifting frame is used to lift the anode busbar.

[0003] Before lifting, the screw rod of the anode clamp needs to be loosened first. A tightening and loosening device is provided on the busbar lifting frame, such as Figure 1 and Figure 2 shown. The tightening and loosening device includes a rotary driving device 10, a transmission outer sleeve 20, a transmission inner sleeve 30, a transmission shaft 40, an annular sleeve 50 and a wrench head 60. The transmission inner sleeve 30 is arranged inside one end of the transmission outer sleeve 20. One end of the transmission shaft 40 is inserted into the transmission inner sleeve 30 and is arranged in the transmission outer sleeve 20 in a vertically telescopic manner. The other end of the transmission shaft 40 is connected to the wrench head 60 through the annular sleeve 50. The rotary driving device 10 can drive the transmission shaft 40 and the wrench head 60 to rotate forward or backward through the transmission outer sleeve 20 and the transmission inner sleeve 30.

[0004] The torque for tightening or loosening the wrench head 60 is usually 400 - 600 Nm. Currently, the transmission inner sleeve 30 and the transmission outer sleeve 20 are generally fixed by welding. The welding point a is arranged between the outer peripheral wall of the transmission inner sleeve 30 and the end face of the transmission outer sleeve 20, as Figure 2 shown. Adopting this welding method, not only the welding strength fails to meet the user's usage requirements, but also the welding point a is prone to cracking after long-term operation, which not only directly affects the working efficiency of the busbar lifting frame, but may also lead to safety accidents in severe cases. Utility Model Content

[0005] The first object of the utility model is to provide a welding structure that can withstand a large torque.

[0006] The second object of the utility model is to provide a tightening and loosening device including the above welding structure.

[0007] In order to achieve the above-mentioned first purpose, the utility model provides a welding structure, including a transmission outer sleeve and a transmission inner sleeve, the transmission inner sleeve is arranged in the transmission outer sleeve, the transmission outer sleeve can drive the transmission inner sleeve to rotate around its axis, the transmission outer sleeve is provided with a through hole, the through hole connects the inner and outer sides of the transmission outer sleeve, the transmission inner sleeve is provided with a groove, the groove is connected with the through hole, the through hole and the groove are filled with metal filler, and the transmission outer sleeve and the transmission inner sleeve are welded together by heating the metal filler.

[0008] It can be seen from the above scheme that by arranging a metal filler between the transmission outer sleeve and the transmission inner sleeve, then heating and melting the metal filler to make it flow, and then reconnecting it tightly with the transmission outer sleeve and the transmission inner sleeve after it cools down, it is beneficial to improve the welding strength and torque of the two, and ensure that the welding point of the two will not crack even under the action of a large torque.

[0009] A further solution is that a polygonal hole is provided on the inner side of the transmission inner sleeve along its axial direction, and the groove is arranged corresponding to the edge of the polygonal hole.

[0010] A further solution is that a preset distance is spaced between the bottom of the groove and the edge of the polygonal hole.

[0011] A further solution is that the number of perforations is set to be more than two, and all the perforations are arranged along the circumference of the transmission sleeve; the number of grooves is equal to the number of perforations, and the grooves and perforations are arranged in a one-to-one correspondence.

[0012] A further solution is that after welding, the surface of the metal filler and the surface of the transmission housing are smoothly transitioned.

[0013] A further solution is that the outer peripheral wall of the transmission outer sleeve is provided with an arc surface portion, the perforations are provided on the arc surface portion, and the surface of the metal filler is an arc surface.

[0014] A further solution is that the outer peripheral wall of the transmission outer sleeve is provided with a plane portion, the perforations are provided on the plane portion, and the surface of the metal filler is a plane.

[0015] A further solution is that the transmission inner sleeve and the transmission outer sleeve are also fixed by welding via an annular welding portion.

[0016] A further solution is that a step portion is provided at one end of the transmission inner sleeve, the step portion protrudes from the end of the transmission outer sleeve and is adjacent to the end face of the transmission outer sleeve, and the annular welding portion is provided between the outer peripheral wall of the step portion and the end face of the transmission outer sleeve.

[0017] In order to achieve the above-mentioned second purpose, the utility model provides a tensioning device, including a rotary drive device, a transmission shaft, a screw head and the above-mentioned welding structure, one end of the transmission shaft is slidably inserted into the transmission inner sleeve, and the other end of the transmission shaft is connected to the screw head. The rotary drive device can drive the transmission outer sleeve to rotate forward or reverse, and then drive the transmission shaft and the screw head to rotate through the transmission inner sleeve. Brief Description of the Drawings

[0018] Figure 1 is a structural diagram of a tensioning device in the prior art.

[0019] Figure 2 is a cross-sectional view of the transmission outer sleeve and the transmission inner sleeve of the tensioning device in the prior art.

[0020] Figure 3 is an axial cross-sectional view of the transmission outer sleeve and the transmission inner sleeve in the first embodiment of the welding structure of the present utility model.

[0021] Figure 4 is a radial cross-sectional view of the transmission outer sleeve and the transmission inner sleeve in the first embodiment of the welding structure of the present utility model.

[0022] Figure 5 is an axial cross-sectional view of the transmission outer sleeve and the transmission inner sleeve in the second embodiment of the welding structure of the present utility model.

[0023] The present utility model will be further described below in conjunction with the drawings and embodiments. Detailed Embodiment

[0024] The first embodiment of the welding structure:

[0025] Refer to Figure 3 and Figure 4 . A welding structure provided in this embodiment is mainly applied to the tensioning device of the anode clamp. The welding structure includes a transmission outer sleeve 1 and a transmission inner sleeve 2. The transmission inner sleeve 2 is arranged inside the transmission outer sleeve 1. The transmission outer sleeve 1 can drive the transmission inner sleeve 2 to rotate around its axis. In this embodiment, both the transmission outer sleeve 1 and the transmission inner sleeve 2 are made of metal materials. Preferably, the transmission outer sleeve 1 is a steel pipe, and the transmission inner sleeve 2 is an internal hexagonal sleeve.

[0026] A through hole 11 is formed in the transmission outer sleeve 1. The through hole 11 communicates with the inside and outside of the transmission outer sleeve 1. Preferably, the through hole 11 extends along the radial direction of the transmission outer sleeve 1 and penetrates the single-side wall thickness of the transmission outer sleeve 1. A groove 21 is formed in the transmission inner sleeve 2. The groove 21 is recessed in the outer peripheral wall of the transmission inner sleeve 2. The groove 21 communicates with the through hole 11. The through hole 11 and the groove 21 are filled with a metal filler 3a that can be used for welding. After being heated by a heat source, the metal filler 3a melts and flows in the through hole 11 and the groove 21, so that it can better contact the transmission outer sleeve 1 and the transmission inner sleeve 2. After cooling, it can be tightly connected to the transmission outer sleeve 1 and the transmission inner sleeve 2. The transmission outer sleeve 1 and the transmission inner sleeve 2 are welded together through the metal filler 3a.

[0027] A polygon hole 22 is axially and penetratingly formed in the inner side of the transmission inner sleeve 2. The polygon hole 22 can be a triangle, a quadrilateral, a pentagon, a hexagon, etc. In this embodiment, a hexagon hole is taken as an example. The groove 21 is arranged corresponding to the side of the polygon hole 22. A preset distance is provided between the bottom of the groove 21 and the side of the polygon hole 22, and the preset distance is such that it will not communicate with the polygon hole 22. In this embodiment, in the radial direction, the depth of the groove 21 is less than or equal to two-thirds of the thickness from the outer peripheral wall of the transmission inner sleeve 2 to the side of the polygon hole 22. That is, the depth of the groove 21 is L1, and the thickness from the outer peripheral wall of the transmission inner sleeve 2 to the side of the polygon hole 22 is L2, L1≤2 / 3L2. Preferably, L1 = 1 / 2L2.

[0028] In order to further improve the welding strength of the two, the number of the through holes 11 is set to be more than two. In this embodiment, three through holes 11 are taken as an example, and the three through holes 11 are arranged at equal intervals along the circumferential direction of the transmission outer sleeve 1. The number of the grooves 21 is equal to the number of the through holes 11, and the grooves 21 are arranged in one-to-one correspondence with the through holes 11.

[0029] After welding, the surface of the metal filler 3a is smoothly transitioned with the surface of the transmission outer sleeve 1. In this embodiment, an arc surface part is provided on the outer peripheral wall of the transmission outer sleeve 1. The arc surface part coincides with the outer peripheral wall of the transmission outer sleeve 1. The through holes 11 are arranged on the arc surface part. The surface of the metal filler 3a is an arc surface, and the arc surface is flush with the outer peripheral wall of the transmission outer sleeve 1.

[0030] In Figure 3 this, the transmission inner sleeve 2 and the transmission outer sleeve 1 of this embodiment are also welded and fixed through an annular welding part 12. Specifically:

[0031] One end of the transmission inner sleeve 2 is provided with a step part 23. The step part 23 protrudes from the end of the transmission outer sleeve 1. The step part 23 is adjacent to the end surface of the transmission outer sleeve 1, preferably abuts. The annular welding part 12 is arranged between the outer peripheral wall of the step part 23 and the end surface of the transmission outer sleeve 1. Through double welding in this embodiment, the connection strength between the transmission outer sleeve 1 and the transmission inner sleeve 2 can be greatly improved, enabling it to withstand a large torque and avoiding the occurrence of fracture at the welding part during the rotation process.

[0032] Second embodiment of the welding structure:

[0033] Referring to Figure 5 , on the basis of the above first embodiment, the welding structure provided in this embodiment has a flat surface part 13 on the outer peripheral wall of the transmission outer sleeve 1. The flat surface part 13 is slightly recessed from the outer peripheral wall of the transmission outer sleeve 1. The four sides of the flat surface part 13 are smoothly transitioned with the outer peripheral wall of the transmission outer sleeve 1. The through holes 11 are arranged on the flat surface part 13. The surface of the metal filler 3b is a flat surface, and the flat surface is flush with the flat surface part 13. The setting of the flat surface part 13 is beneficial to facilitating drilling on the transmission outer sleeve 1 and improving the accuracy of the drilling position.

[0034] Embodiment of the tightening device:

[0035] A tightening device provided in this embodiment includes a rotary driving device, a transmission shaft, a screwing head, an up-and-down driving device, and the welding structure of the above embodiment. The cross-sectional shape of the transmission shaft matches the polygonal hole of the transmission inner sleeve. One end of the transmission shaft is slidably inserted into the transmission inner sleeve. The up-and-down driving device is used to drive the transmission shaft to move up and down within the transmission inner sleeve and the transmission outer sleeve. The other end of the transmission shaft is connected to the screwing head, and the screwing head is used to cooperate with and connect to the lead screw of the anode fixture. The rotary driving device can drive the transmission outer sleeve to rotate forward or backward, and then drive the transmission shaft and the screwing head to rotate through the transmission inner sleeve.

[0036] In summary, in the present utility model, by arranging a metal filler between the transmission outer sleeve and the transmission inner sleeve, then heating and melting the metal filler to make it flow, and after it cools, reconnecting it tightly with the transmission outer sleeve and the transmission inner sleeve, it is beneficial to improve the welding strength and torque between the two, ensuring that the welded part between the two will not crack even under the action of a large torque.

[0037] Finally, it should be emphasized that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A welding structure, comprising a transmission outer sleeve and a transmission inner sleeve, wherein the transmission inner sleeve is arranged inside the transmission outer sleeve, and the transmission outer sleeve can drive the transmission inner sleeve to rotate around its axis, characterized in that: The transmission outer sleeve is provided with a through hole, the through hole connects the inner and outer sides of the transmission outer sleeve, the transmission inner sleeve is provided with a groove, the groove connects with the through hole, the through hole and the groove are filled with metal filler, and the transmission outer sleeve and the transmission inner sleeve are welded together by heating the metal filler.

2. The welding structure according to claim 1, characterized in that: A polygonal hole is formed on the inner side of the transmission inner sleeve along its axial direction, and the groove is arranged corresponding to the edge of the polygonal hole.

3. The welding structure according to claim 2, characterized in that: A preset distance is provided between the bottom of the groove and the edge of the polygonal hole.

4. The welding structure according to claim 1, characterized in that: The number of the perforations is set to be more than two, and all the perforations are arranged along the circumference of the transmission outer sleeve; The number of the grooves is equal to the number of the through holes, and the grooves and the through holes are arranged in a one-to-one correspondence.

5. The welding structure according to claim 1, characterized in that: After welding, the surface of the metal filler and the surface of the transmission outer sleeve have a smooth transition.

6. The welding structure according to claim 5, characterized in that: The outer peripheral wall of the transmission outer sleeve is provided with an arc surface portion, the perforations are provided on the arc surface portion, and the surface of the metal filler is an arc surface.

7. The welding structure according to claim 5, characterized in that: The outer peripheral wall of the transmission outer sleeve is provided with a plane portion, the perforations are provided on the plane portion, and the surface of the metal filler is a plane.

8. The welding structure according to any one of claims 1 to 7, characterized in that: The transmission inner sleeve and the transmission outer sleeve are also welded and fixed via an annular welding portion.

9. The welding structure according to claim 8, characterized in that: A step portion is provided at one end of the transmission inner sleeve, the step portion protrudes from the end of the transmission outer sleeve and is adjacent to the end face of the transmission outer sleeve, and the annular welding portion is provided between the outer peripheral wall of the step portion and the end face of the transmission outer sleeve.

10. The tensioning device is characterized by: It comprises a rotary drive device, a transmission shaft, a screw head and a welding structure as described in any one of claims 1 to 9, one end of the transmission shaft is slidably inserted into the transmission inner sleeve, the other end of the transmission shaft is connected to the screw head, and the rotary drive device can drive the transmission outer sleeve to rotate forward or reversely, thereby driving the transmission shaft and the screw head to rotate through the transmission inner sleeve.

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