Wire spool retaining device

The design of the base, bearing shaft, and adjustment components solved the problem of wire detachment in the wire spool fixing device, achieving stable wire feeding and flexible adjustment, and improving the reliability of welding operations.

CN224493312UActive Publication Date: 2026-07-14TIANJIN DAQIAO WELDING WIRE CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
TIANJIN DAQIAO WELDING WIRE CO LTD
Filing Date
2025-06-11
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

In the use of existing wire spool fixing devices, the welding wire is prone to loosening due to insufficient tension, which affects the normal operation of the wire feeding mechanism and thus affects the welding operation.

Method used

The design employs a base, a bearing shaft, and an adjustment assembly. By combining a separation roller shaft, a support roller shaft, and a damping assembly, the tension of the welding wire is adjusted. Furthermore, by adjusting the position and orientation of the adjustment assembly, the wire feeding direction is controlled to prevent the welding wire from becoming loose.

Benefits of technology

It effectively prevents welding wire from coming loose, ensures the stable operation of the wire feeding mechanism, adapts to different wire feeding direction adjustments, and improves the reliability of welding operations.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a kind of welding wire reel fixing device, comprising: pedestal, bearing shaft and adjusting assembly.The top surface of pedestal is equipped with accommodating hole, arc-shaped installation cutout, separation roller shaft and support roller shaft, rotatable separation roller sleeve is sleeved on separation roller shaft, and rotatable support roller sleeve is sleeved on support roller shaft.Bearing shaft includes sequentially connected locking section, bearing section, limiting section, connecting section and adjusting section from top to bottom, connecting section is rotatably arranged in accommodating hole, detachable locking ring is equipped on locking section, detachable connecting ring is equipped on adjusting section, and damping assembly is equipped between the top surface of connecting ring and the bottom surface of pedestal.Adjusting assembly includes connecting seat and two adjusting roller shafts, connecting seat is adjustably arranged on arc-shaped installation cutout, and two adjusting roller shafts are both arranged on the top of connecting seat.The welding wire reel fixing device can obtain sufficient tension in welding wire, to avoid loose phenomenon.
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Description

Technical Field

[0001] This utility model belongs to the field of welding wire spool fixing technology, and in particular relates to a welding wire spool fixing device. Background Technology

[0002] A welding wire spool is a device for storing and transporting welding wire. During welding operations, the operator first needs to fix the welding wire spool on the rotating shaft, and then guide the welding wire wound on the spool into the wire feeding mechanism, thereby continuously and stably supplying welding wire into the welding equipment with the help of the wire feeding mechanism.

[0003] In existing technologies, the wire spool fixing device is relatively primitive, typically consisting of three parts: a fixing frame, an anti-detachment disc, and a damping rotating shaft. However, in practical applications, the welding wire is prone to loosening after leaving the wire spool due to insufficient tension, which can affect the normal operation of the wire feeding mechanism and consequently have an adverse impact on the welding operation. Utility Model Content

[0004] In view of this, the present invention aims to provide a wire spool fixing device to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A wire spool fixing device includes: a base, a bearing shaft, and an adjusting assembly; the top surface of the base is provided with a receiving hole, an arc-shaped mounting notch, a separating roller shaft, and a supporting roller shaft, the arc-shaped mounting notch, the separating roller shaft, and the supporting roller shaft are arranged in a ring around the receiving hole, the center of the arc of the arc-shaped mounting notch coincides with the center of the receiving hole, and the supporting roller shaft is located between the arc-shaped mounting notch and the separating roller shaft; the axes of the separating roller shaft and the supporting roller shaft are both parallel to the axis of the receiving hole, a rotatable separating roller sleeve is fitted on the separating roller shaft, and a rotatable supporting roller sleeve is fitted on the supporting roller shaft; the bearing shaft includes a locking section, a bearing section, a limiting section, a connecting section, and an adjusting section connected sequentially from top to bottom, the connecting section is rotatably disposed inside the receiving hole, and the outer diameter of the limiting section is larger than the inner diameter of the receiving hole; in the locking section... The device is equipped with a detachable locking ring, and a clamping gap for accommodating the welding wire spool is formed between the bottom surface of the locking ring and the top surface of the limiting section. A detachable connecting ring is provided on the adjusting section, and a damping assembly is provided between the top surface of the connecting ring and the bottom surface of the base. The adjusting assembly includes a connecting seat and two adjusting rollers. The connecting seat is adjustablely positioned on the arc-shaped mounting cutout. Both adjusting rollers are located on the top of the connecting seat, and the axis of each adjusting roller is parallel to the axis of the receiving hole. A rotatable adjusting roller sleeve is fitted on each adjusting roller, and a receiving gap for accommodating the welding wire is provided between the two adjusting roller sleeves. In use, the operator can fix the welding wire spool inside the clamping gap and allow the welding wire on the spool to pass sequentially around the separating roller sleeve and the supporting roller sleeve, finally leaving the device along the receiving gap.

[0007] Furthermore, the damping assembly includes a first damping ring and a second damping ring, both of which are sleeved on the adjusting section, with the first damping ring located between the second damping ring and the base; a positioning protrusion is provided on the top surface of the first damping ring, and a positioning groove for accommodating the positioning protrusion is provided on the bottom surface of the base; a limiting strip is provided on the inner sidewall of the second damping ring, and a limiting groove for accommodating the limiting strip is provided on the adjusting section.

[0008] Furthermore, a connecting screw is provided on the bottom surface of the connecting seat. The connecting screw is placed inside the arc-shaped installation notch, and a locking nut is provided on the connecting screw, with the locking nut located below the base.

[0009] Furthermore, the adjustment assembly also includes a blocking plate, which is detachably disposed at the end of the adjustment roller shaft away from the connecting seat, and has a mounting hole on the blocking plate for accommodating the end of the adjustment roller shaft.

[0010] Furthermore, a first anti-slip sleeve is provided on the outside of the bearing section, and the outer diameter of the first anti-slip sleeve is equal to the inner diameter of the welding wire spool.

[0011] Furthermore, the bottom surface of the locking ring is provided with a splicing sleeve, which is inserted into the inside of the welding wire spool. A second anti-slip sleeve is fitted on the outside of the splicing sleeve, and the outer diameter of the second anti-slip sleeve is equal to the inner diameter of the welding wire spool.

[0012] Furthermore, the base has two support plates on its bottom surface, which are located on both sides of the receiving hole. Each support plate has a connecting plate at its bottom end, and the connecting plate has a connecting hole for receiving bolts.

[0013] Compared with the prior art, the welding wire spool fixing device of this utility model has the following advantages:

[0014] This utility model discloses a wire spool fixing device, which includes a separating roller shaft, a supporting roller shaft, and an adjusting assembly on a base. After the wire spool is installed on the bearing shaft, the operator can sequentially pass the welding wire around the separating roller sleeve and the supporting roller sleeve, and finally guide it into the wire feeding mechanism along the receiving gap in the adjusting assembly. Since the position of the adjusting assembly can be adjusted along the arc-shaped installation notch, the distance between the adjusting assembly and the separating roller shaft can be adjusted, thereby controlling the tension force inside the welding wire and preventing it from loosening. Furthermore, this device can also change the orientation of the adjusting assembly according to actual needs, so as to flexibly control the wire feeding direction. In addition, this device is also equipped with a damping assembly on the bearing shaft. During use, the presence of the damping assembly can prevent the bearing shaft from rotating due to inertia, thereby preventing the welding wire from loosening due to inertial rotation. Attached Figure Description

[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of the welding wire spool fixing device according to an embodiment of the present utility model;

[0017] Figure 2 This is a top view of the wire spool fixing device described in this embodiment of the present invention in its use state;

[0018] Figure 3 This is a schematic diagram of the structure of the base described in an embodiment of the present utility model;

[0019] Figure 4 This is a schematic diagram of the bottom structure of the base described in an embodiment of the present utility model;

[0020] Figure 5 This is an exploded view of the adjustment component described in an embodiment of the present invention;

[0021] Figure 6This is a cross-sectional view of the wire spool fixing device described in an embodiment of the present invention;

[0022] Figure 7 This is an exploded view of the bearing shaft and related components described in an embodiment of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1-Base; 11-Accommodation hole; 12-Arc-shaped mounting notch; 13-Separation roller shaft; 131-Separation roller sleeve; 14-Support roller shaft; 141-Support roller sleeve; 15-Positioning groove; 16-Support plate; 17-Connecting plate; 171-Connecting hole; 21-Locking section; 22-Bearing section; 221-First anti-slip sleeve; 23-Limiting section; 24-Connecting section; 25-Adjusting section; 251-Limiting groove; 3-Locking ring; 31-Interlocking sleeve; 32-Second anti-slip sleeve; 4-Connecting ring; 5-Connecting seat; 51-Connecting screw; 52-Locking nut; 6-Adjusting roller shaft; 61-Adjusting roller sleeve; 71-First damping ring; 711-Positioning protrusion; 72-Second damping ring; 721-Limiting strip; 8-Blocking plate; 81-Assembly hole; 9-Welding wire spool; 91-Welding wire. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] A wire spool fixing device, the structure of which can be made of Figures 1-7 The following is an illustration. In this embodiment, the wire spool fixing device includes: a base 1, a bearing shaft, and an adjusting component. The base 1 is used to provide an installation foundation for other components in the device, the bearing shaft is used to fix the wire spool 9, and the adjusting component is used to flexibly adjust the tension of the wire 91 during operation to prevent the wire 91 from becoming loose.

[0030] Specifically, such as Figure 3 As shown, the top surface of the base 1 is provided with a receiving hole 11, an arc-shaped mounting notch 12, a separating roller shaft 13, and a supporting roller shaft 14. The arc-shaped mounting notch 12, the separating roller shaft 13, and the supporting roller shaft 14 are arranged in a ring around the receiving hole 11. The center of the arc of the arc-shaped mounting notch 12 coincides with the center of the receiving hole 11, and the supporting roller shaft 14 is located between the arc-shaped mounting notch 12 and the separating roller shaft 13. The axes of the separating roller shaft 13 and the supporting roller shaft 14 are both parallel to the axis of the receiving hole 11. A rotatable separating roller sleeve 131 is fitted on the separating roller shaft 13, and a rotatable supporting roller sleeve 141 is fitted on the supporting roller shaft 14.

[0031] like Figure 6 and Figure 7As shown, the bearing shaft includes a locking section 21, a bearing section 22, a limiting section 23, a connecting section 24, and an adjusting section 25 connected sequentially from top to bottom. The outer diameter of the limiting section 23 is larger than the inner diameter of the receiving hole 11. A detachable locking ring 3 is provided on the locking section 21, and a clamping gap for accommodating the welding wire spool 9 is formed between the bottom surface of the locking ring 3 and the top surface of the limiting section 23. A detachable connecting ring 4 is also provided on the adjusting section 25, and a damping assembly for preventing the bearing shaft from rotating due to inertia is provided between the top surface of the connecting ring 4 and the bottom surface of the base 1. During assembly, the operator should first remove the connecting ring 4 and the damping assembly so that the connecting section 24 can be rotatably positioned inside the receiving hole 11. Then, the connecting ring 4 and the damping assembly are installed to complete the assembly between the bearing shaft and the base 1. Next, the locking ring 3 can be removed so that the welding wire spool 9 can be fitted onto the bearing shaft. Finally, the locking ring 3 is installed so that the welding wire spool 9 and the bearing shaft can be well clamped and fixed.

[0032] It should be noted that, in order to achieve a detachable connection between the locking ring 3 and the connecting ring 4, external threads can be provided on the outer sidewalls of the locking section 21 and the adjusting section 25 in this embodiment. Correspondingly, internal threads can be provided on the inner sidewalls of the locking ring 3 and the connecting ring 4, thereby achieving a detachable connection between the locking ring 3 and the connecting ring 4 and the bearing shaft through a threaded connection.

[0033] Optionally, to prevent relative rotation between the welding wire spool 9 and the bearing shaft, a first anti-slip sleeve 221 (which may be made of rubber) can be fitted onto the outside of the bearing section 22, and the outer diameter of the first anti-slip sleeve 221 is equal to the inner diameter of the welding wire spool. Furthermore, a splicing sleeve 31 can be provided on the bottom surface of the locking ring 3, and a second anti-slip sleeve 32 (which may be made of rubber) can be fitted onto the outside of the splicing sleeve 31, and the outer diameter of the second anti-slip sleeve 32 is equal to the inner diameter of the welding wire spool 9. During assembly between the welding wire spool 9 and the bearing shaft, the splicing sleeve 31 should be inserted into the welding wire spool 9. Since the outer diameters of the first anti-slip sleeve 221 and the second anti-slip sleeve 32 are equal to the inner diameter of the welding wire spool 9, friction can be used to restrict the rotational freedom of the welding wire spool 9, preventing relative rotation between the welding wire spool 9 and the bearing shaft.

[0034] In addition, to accommodate different specifications of welding wire spools 9, the staff can also replace the first anti-slip sleeve 221 and the second anti-slip sleeve 32 according to the actual situation, so that the outer diameter of the first anti-slip sleeve 221 and the second anti-slip sleeve 32 matches the inner diameter of the welding wire spool 9.

[0035] As an optional implementation of this embodiment, the damping assembly may include a first damping ring 71 and a second damping ring 72 (the first damping ring 71 and the second damping ring 72 may be made of rubber or nylon material). During assembly, both the first damping ring 71 and the second damping ring 72 should be fitted onto the adjusting section 25, and the first damping ring 71 should be located between the second damping ring 72 and the base 1. In addition, a positioning protrusion 711 should be provided on the top surface of the first damping ring 71, and a positioning groove 15 for accommodating the positioning protrusion 711 should be provided on the bottom surface of the base 1, thereby preventing relative rotation between the first damping ring 71 and the base 1 by means of the cooperation between the positioning protrusion 711 and the positioning groove 15. Correspondingly, a limiting strip 721 should be provided on the inner wall of the second damping ring 72, and a limiting groove 251 for accommodating the limiting strip 721 should be provided on the adjusting section 25. This, in turn, prevents relative rotation between the second damping ring 72 and the bearing shaft through the cooperation of the limiting strip 721 and the limiting groove 251. During use, tightening the connecting ring 4 allows the first damping ring 71 and the second damping ring 72 to come into contact. When the bearing shaft rotates due to the wire feeding action of the welding wire reel 9, the contact between the first damping ring 71 and the second damping ring 72 dampes the rotation of the bearing shaft, thus preventing abnormal rotation due to inertia and reducing the risk of the welding wire 91 becoming loose.

[0036] like Figure 1 and Figure 5 As shown, the adjustment assembly includes a connecting seat 5 and two adjusting roller shafts 6. The connecting seat 5 is adjustablely positioned on the arc-shaped mounting notch 12. Both adjusting roller shafts 6 are located on top of the connecting seat 5, and the axis of each adjusting roller shaft 6 is parallel to the axis of the receiving hole 11. A rotatable adjusting roller sleeve 61 is fitted on each adjusting roller shaft 6, and a receiving gap for accommodating the welding wire 91 is provided between the two adjusting roller sleeves 61.

[0037] like Figure 2 As shown, after the welding wire spool 9 is installed onto the bearing shaft, the operator can pass the welding wire 91 sequentially around the separating roller sleeve 131 and the support roller sleeve 141, and then leave the device along the receiving gap to enter the subsequent wire feeding mechanism. Since the connecting seat 5 can be adjusted along the arc-shaped mounting notch 12, the operator can change the position of the adjusting component according to the tension requirement inside the welding wire 91 (to...). Figure 2For example, when the adjusting component moves along the arc-shaped mounting cut towards the support roller shaft 14, the distance between the adjusting component and the separating roller shaft 13 decreases, and the tension force inside the welding wire 91 decreases. Conversely, when the adjusting component moves along the arc-shaped mounting cut away from the support roller shaft 14, the distance between the adjusting component and the separating roller shaft 13 increases, and the tension force inside the welding wire 91 increases. This ensures that the welding wire 91 receives appropriate tension, preventing the welding wire from becoming loose. Furthermore, the operator can adjust the orientation of the adjusting component according to the relative position between the wire feeding mechanism and the device, ensuring that the accommodating gap in the adjusting component is aligned with the feed inlet of the wire feeding mechanism, thus adapting to different work requirements.

[0038] Optionally, to prevent abnormal movement of the connecting seat 5 during use, a connecting screw 51 may be provided on the bottom surface of the connecting seat 5, and a locking nut 52 may be provided on the connecting screw 51. During assembly, the connecting screw 51 should be placed inside the arc-shaped mounting notch 12, and the locking nut 52 should be located below the base 1. After adjusting the position and orientation of the adjusting components, the operator can tighten the locking nut 52 to fix the position and orientation of the connecting seat 5.

[0039] In addition, to prevent the welding wire 91 from dislodging from the receiving gap, the adjusting assembly may also include a blocking plate 8, and the blocking plate 8 is provided with a mounting hole 81 for receiving the end of the adjusting roller shaft 6. When the welding wire 91 enters the receiving gap, the operator can detachably set the blocking plate 8 at the end of the adjusting roller shaft 6 away from the connecting seat 5, thereby blocking the welding wire 91.

[0040] As another optional implementation of this embodiment, to facilitate the installation of this device near the wire feeding mechanism and to provide sufficient operating space at the bottom of the base 1, two support plates 16 can also be provided on the bottom surface of the base 1. The two support plates 16 should be located on both sides of the receiving hole 11, and a connecting plate 17 is provided at the bottom end of each support plate 16, with connecting holes 171 for accommodating bolts on the connecting plate 17. During assembly, the operator can fix the base 1 near the wire feeding mechanism with bolts. Due to the presence of the support plates 16, the bottom of the base 1 will have sufficient operating space, so the operator can adjust the position of the adjustment components and replace the damping components without disassembling the base 1, thereby improving the ease of use of this device.

[0041] The effects of the above solution are explained below:

[0042] This embodiment provides a wire spool fixing device that can adjust the tension of the welding wire through a separating roller shaft, a supporting roller shaft, and an adjusting component, thereby preventing the welding wire from becoming loose. Secondly, this device can dampen the rotation of the bearing shaft through a damping component, preventing the welding wire spool from rotating due to inertia. Furthermore, this device can change the direction of the welding wire feed by adjusting the orientation of the adjusting component, thus meeting various practical application requirements.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wire spool fixing device, characterized in that, include: Base (1), bearing shaft and adjusting assembly; The base (1) has a receiving hole (11), an arc-shaped mounting cut (12), a separating roller shaft (13), and a supporting roller shaft (14) on its top surface. The arc-shaped mounting cut (12), the separating roller shaft (13), and the supporting roller shaft (14) are arranged in a ring around the receiving hole (11). The center of the arc of the arc-shaped mounting cut (12) coincides with the center of the receiving hole (11), and the supporting roller shaft (14) is located between the arc-shaped mounting cut (12) and the separating roller shaft (13). The axes of the separating roller shaft (13) and the support roller shaft (14) are parallel to the axis of the receiving hole (11). A rotatable separating roller sleeve (131) is fitted on the separating roller shaft (13), and a rotatable support roller sleeve (141) is fitted on the support roller shaft (14). The bearing shaft includes a locking section (21), a bearing section (22), a limiting section (23), a connecting section (24), and an adjusting section (25) connected sequentially from top to bottom. The connecting section (24) can... The rotating part is located inside the receiving hole (11), and the outer diameter of the limiting section (23) is larger than the inner diameter of the receiving hole (11); a detachable locking ring (3) is provided on the locking section (21), and a clamping gap for accommodating the welding wire spool (9) is formed between the bottom surface of the locking ring (3) and the top surface of the limiting section (23); a detachable connecting ring (4) is provided on the adjusting section (25), and a damping component is provided between the top surface of the connecting ring (4) and the bottom surface of the base (1); the adjusting part is located inside the receiving hole (11), and the outer diameter of the limiting section (23) is larger than the inner diameter of the receiving hole (11); the adjusting part is located inside the receiving hole (11), and the limiting section (23) is located inside the receiving hole (11); the limiting section (23) ... The assembly includes a connecting seat (5) and two adjusting roller shafts (6). The connecting seat (5) is adjustablely positioned on the arc-shaped mounting notch (12). The two adjusting roller shafts (6) are both located on the top of the connecting seat (5). The axis of each adjusting roller shaft (6) is parallel to the axis of the receiving hole (11). A rotatable adjusting roller sleeve (61) is fitted on each adjusting roller shaft (6), and a receiving gap for receiving welding wire (91) is provided between the two adjusting roller sleeves (61).

2. The wire spool fixing device according to claim 1, characterized in that: The damping assembly includes a first damping ring (71) and a second damping ring (72), both of which are sleeved on the adjusting section (25), and the first damping ring (71) is located between the second damping ring (72) and the base (1); a positioning protrusion (711) is provided on the top surface of the first damping ring (71), and a positioning groove (15) for accommodating the positioning protrusion (711) is provided on the bottom surface of the base (1); a limiting strip (721) is provided on the inner sidewall of the second damping ring (72), and a limiting groove (251) for accommodating the limiting strip (721) is provided on the adjusting section (25).

3. The wire spool fixing device according to claim 1, characterized in that: The bottom surface of the connecting seat (5) is provided with a connecting screw (51), which is placed inside the arc-shaped installation cut (12). A locking nut (52) is provided on the connecting screw (51), and the locking nut (52) is located below the base (1).

4. The wire spool fixing device according to claim 1, characterized in that: The adjustment assembly also includes a blocking plate (8), which is detachably disposed at one end of the adjustment roller shaft (6) away from the connecting seat (5), and has an assembly hole (81) on the blocking plate (8) for receiving the end of the adjustment roller shaft (6).

5. The wire spool fixing device according to claim 1, characterized in that: The bearing section (22) is covered with a first anti-slip sleeve (221), and the outer diameter of the first anti-slip sleeve (221) is equal to the inner diameter of the welding wire spool (9).

6. The wire spool fixing device according to claim 1, characterized in that: The bottom surface of the locking ring (3) is provided with a splicing sleeve (31), which is inserted into the inside of the welding wire spool (9). A second anti-slip sleeve (32) is sleeved on the outside of the splicing sleeve (31), and the outer diameter of the second anti-slip sleeve (32) is equal to the inner diameter of the welding wire spool (9).

7. The wire spool fixing device according to claim 1, characterized in that: The base (1) has two support plates (16) on its bottom surface. The two support plates (16) are located on both sides of the receiving hole (11). Each support plate (16) has a connecting plate (17) at its bottom end, and the connecting plate (17) has a connecting hole (171) for receiving bolts.