An alignment tool for a weathervane S-pole

Abstract

The utility model provides a kind of alignment tool of wind vane S pole, including positioning assembly, hold tightly and laser pen;Positioning assembly includes positioning main rod;Hold tightly is provided with mounting hole, hold tightly and laser pen are all set on positioning main rod, the extension of the emission direction of laser pen and the axial line of mounting hole center of circle are coplanar, and the extension of the emission direction of laser pen and the axial line of mounting hole center of circle are both common in the plane and the central axis of positioning main rod is parallel;Wind vane is installed to mounting hole, hold tightly holds tightly and fixes wind vane;The utility model is by using above-mentioned structure, can solve the problem that wind vane S pole is inconvenient to operate when installing and wind vane S pole is not easy to align with the center line of vertical direction of machine head.

Description

Technical Field

[0001] This utility model relates to the field of wind power equipment technology, specifically to an alignment fixture for the S pole of a wind vane. Background Technology

[0002] A wind vane is a wind direction indicator widely used in various wind turbine units. Based on the existing structure of wind turbine units, a typical wind turbine base includes a base and a turbine head, with the turbine head mounted on the base and the wind vane mounted on top of the base. Since wind vanes are used outdoors, they are easily damaged. When replacing a wind vane, the S-pole of the wind vane needs to be aligned with the vertical centerline of the turbine head. Currently, alignment of the S-pole with the vertical centerline of the turbine head is mainly done visually. This method is inconvenient and difficult to align, affecting installation efficiency and accuracy. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide an alignment fixture for the S pole of a wind vane, so as to solve the problem that the operation of the S pole of the wind vane is inconvenient and it is not easy to align it with the vertical centerline of the machine head when it is installed in the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an alignment fixture for the S pole of a wind vane, including a positioning component, a clamping component and a laser pointer; The positioning component includes a positioning main rod; The clamping component is provided with mounting holes. Both the clamping component and the laser pointer are mounted on the positioning main rod. The extension line of the laser pointer's emission direction is coplanar with the axial line of the center of the mounting hole. The plane where the extension line of the laser pointer's emission direction and the axial line of the center of the mounting hole both lie is parallel to the central axis of the positioning main rod. The wind vane is installed in the mounting holes on the clamping device and is secured by the clamping device.

[0005] In a preferred embodiment, the clamping component is a clamp.

[0006] In a preferred embodiment, the extension line of the laser pointer's emission direction and the axial line of the center of the mounting hole on the clamping member are respectively perpendicular to the central axis of the positioning main rod. The clamping component is located at one end of the positioning main rod, and the center of the mounting hole is located on the central axis of the positioning main rod.

[0007] In a preferred embodiment, the positioning main rod is provided with a screw thread; The positioning main rod is connected to the fan base by a screw thread.

[0008] In a preferred embodiment, a crossbar is also included, one end of which is connected to the positioning main rod. Under the action of external force, the crossbar drives the positioning main rod to rotate and screw into the fan base.

[0009] In a preferred embodiment, the positioning component further includes a movable part, which is disposed on the positioning main rod, and a clamping member is disposed on the movable part; The movable part can move relative to the positioning main rod to change the relative position of the clamping member on the positioning main rod.

[0010] In a preferred embodiment, the movable part includes an elastic element and a pressure cap; Along the length of the positioning main rod, a receiving countersunk hole is provided from the end of the positioning main rod toward the middle. An elastic element is provided in the receiving countersunk hole. One end of the elastic element at the bottom of the receiving countersunk hole is connected to the inner wall of the receiving countersunk hole, and a clamping element is provided at the other end of the elastic element. The pressure cap is provided with a through hole, and the edge of the through hole is provided with a limiting edge. The clamping member passes through the through hole so that the pressure cap is sleeved on the elastic member. The pressure cap is fitted onto the positioning main rod to connect to the end of the positioning main rod that has a countersunk hole opening. The limiting edge acts on the end where the elastic element and the clamping element are connected to compress the elastic element and house it in the countersunk hole.

[0011] In a preferred embodiment, the moving part further includes a mounting block disposed at the end of the elastic member, and a clamping member disposed on the side of the mounting block opposite to the elastic member.

[0012] In a preferred embodiment, the pressure cap and the positioning main rod are connected by threads.

[0013] In a preferred embodiment, the moving part includes a hollow sliding rod and a locking member. A slider is provided on the inner wall of the hollow sliding rod, and a groove is provided on the outer wall of the positioning main rod, with the slider disposed in the groove. The locking element is movably mounted on the hollow sliding rod, and acts on the positioning main rod to lock and position the hollow sliding rod.

[0014] The alignment fixture for the S pole of a wind vane provided by this utility model, by adopting the above-described structure, has the following beneficial effects: (1) By precisely constraining the spatial relationship between the laser pointer, the mounting hole and the positioning rod, the laser beam becomes a visible reference for the S pole direction of the wind vane. During installation, it is only necessary to align the laser spot with the center line of the machine head to ensure that the S pole of the wind vane is synchronously and accurately aligned. This fundamentally eliminates the error and uncertainty of manual visual inspection, and realizes the technological leap from estimation to precise positioning. The installation efficiency and the first-time success rate are greatly improved. (2) The positioning reference, clamping function and installation base are integrated into one complete solution. Operators do not need additional tools or repeated comparisons. They can complete all operations in one step by simply “clamping the wind vane - turning on the laser - aligning - fixing”, which greatly simplifies the process and reduces the technical dependence and labor intensity of operators. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a schematic diagram of another embodiment of the present invention.

[0017] Figure 3 This utility model Figure 2 A schematic diagram of the gland structure.

[0018] Figure 4 This is a schematic diagram of another embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the first structure of the positioning main rod and locking component on the positioning main rod in this utility model.

[0020] Figure 6 This is a schematic diagram of the second structure of the positioning main rod and locking component on the positioning main rod in this utility model.

[0021] Figure 7 This is a schematic diagram of a third structure of the positioning main rod and locking component on the positioning main rod in this utility model.

[0022] Figure 8 This is a schematic diagram of the fourth structure of the positioning main rod and locking component on the positioning main rod in this utility model.

[0023] In the diagram: positioning component 100, positioning main rod 110, moving part 120, hollow sliding rod 121, locking part 122, elastic part 123, pressure cap 124, through hole 1241, limiting edge 1242, mounting block 125, clamping part 200, laser pointer 300, crossbar 400, machine head 500. Detailed Implementation

[0024] Example 1: Figure 1 A schematic diagram of the alignment fixture for the S pole of a wind vane provided in an embodiment of this application.

[0025] See Figure 1As shown, the alignment fixture for the S pole of the wind vane provided in this application includes a positioning component 100, a clamping component 200, and a laser pointer 300. The positioning component 100 includes a positioning main rod 110.

[0026] The clamping component 200 is provided with mounting holes. Both the clamping component 200 and the laser pointer 300 are mounted on the positioning main rod 110. The extension line of the emission direction of the laser pointer 300 ( Figure 5 (a) The axial line between the center of the mounting hole and (b) Figure 5 (b) are coplanar, and the plane containing the extension of the emission direction of the laser pointer 300 and the axial line of the center of the mounting hole is the same plane. Figure 5 (d) and the central axis of the positioning main rod 110 ( Figure 5 c) Parallel.

[0027] Install the wind vane into the mounting hole, and the clamping component 200 clamps and secures the wind vane.

[0028] Example 2: See Figure 5 The laser pointer 300 and the clamping member 200 are disposed on the same side of the positioning main rod 110. At this time, the plane where the extension line of the emission direction of the laser pointer 300 and the axial line of the center of the mounting hole are located is parallel to and does not coincide with the central axis of the positioning main rod 110. The extension line of the emission direction of the laser pointer 300 and the axial line of the center of the mounting hole can be parallel to each other or not parallel to each other. For example, in this embodiment, it is preferred that the extension line of the emission direction of the laser pointer 300 and the axial line of the center of the mounting hole are parallel to each other, and both are perpendicular to the central axis of the positioning main rod 110.

[0029] Among them, laser pointer 300 is an infrared laser pointer.

[0030] It should be noted that, according to existing technology, a wind turbine base typically includes a base and a turbine head 500, with the turbine head 500 mounted on the base. The turbine head 500 has a centerline in the vertical direction. Figure 5 (e) The final alignment of the wind vane's S pole with the vertical centerline of the nose cone 500 is required. The installation process of the alignment fixture in this application is as follows: First, install the wind vane into the mounting hole and ensure that the S pole of the wind vane is aligned with the laser emission direction of the laser pointer 300. Then, pre-install one end of the positioning rod 110 onto the top of the base. It can be understood that at this time, the central axis of the positioning rod 110 ( Figure 5 (c) and the vertical centerline of the nose 500 ( Figure 5(e) They are parallel to each other; the position of the positioning rod 110 is adjusted by the laser assistance of the laser pointer 300. Finally, the laser passes through the center line of the vertical direction of the machine head 500. At this time, the extension line of the emission direction of the laser pointer 300, the axial line of the center of the mounting hole, and the center line of the vertical direction of the machine head 500 are coplanar. Therefore, the S pole of the wind vane is naturally aligned with the center line of the vertical direction of the machine head 500. Finally, the positioning rod 110 is completely fixed to the base. Of course, during the installation process of the above-mentioned alignment fixture for the S pole of the wind vane, the positioning rod 110 can be completely fixed to the base before the wind vane is installed into the mounting hole. What remains unchanged is that the S pole of the wind vane is in the same direction as the laser emission direction of the laser pointer 300. In addition, it should be noted that the clamping part 200 clamps to clamp and quickly fix the wind vane in the mounting hole.

[0031] Example 3: See Figure 6 In other feasible methods, taking the example of pre-installing one end of the positioning main rod 110 to the top of the base, the extension line of the emission direction of the laser pointer 300 ( Figure 6 a) and / or the axial line of the center of the mounting hole ( Figure 6 (b) can be rotated at any angle, so as long as the laser pointer 300 passes through the vertical centerline of the head 500 during installation. Figure 6 (e), and at the same time, point the S pole of the wind vane towards the center line of the vertical direction 500 degrees above the nose of the aircraft. Figure 6 (e) When installed, the S pole of the wind vane should be naturally aligned with the center line of the vertical direction at 500 degrees above the nose of the aircraft. Figure 6 (e).

[0032] Example 4: See Figure 7 Taking the positioning main rod 110 horizontally pre-installed to the top of the base as an example, that is, at this time the central axis of the positioning main rod 110 ( Figure 7 (c) and the vertical centerline of the nose 500 ( Figure 7 (e) are perpendicular to each other, or, can be understood as the central axis of the positioning main rod 110 ( Figure 7 (c) is set horizontally. It is important to note that after the positioning main rod 110 is pre-installed on the top of the base, the extension line of the laser pointer 300's emission direction should be observed. Figure 7 (a) The axial line between the center of the mounting hole and (b) Figure 7 (b) In the vertical direction, they are in an upper and lower position. Thus, when the laser pointer 300 passes through the vertical centerline of the head 500 (e in the figure), after the wind vane is installed into the mounting hole, the S pole of the wind vane can be aligned with the vertical centerline of the head 500. Figure 7 (e).

[0033] Example 5: See Figure 8 The extension line of the emission direction of laser pointer 300 ( Figure 8 a) and / or the axial line of the center of the mounting hole ( Figure 8 (b) can be rotated at any angle, so as long as the laser pointer 300 passes through the center line of the head 500 in the vertical direction during installation. Figure 8 (e), and at the same time, point the S pole of the wind vane towards the center line of the vertical direction 500 degrees above the nose of the aircraft. Figure 8 (e) When installed, the S pole of the wind vane should be naturally aligned with the center line of the vertical direction at 500 degrees above the nose of the aircraft. Figure 8 (e).

[0034] Example 6: Based on any of the aforementioned embodiments 1-5, the clamping member 200 is a clamp, which is an existing device. The clamping ring is the aforementioned mounting hole. When the clamp is tightened, the axis of the clamping ring is the center of the mounting hole. After the wind vane is installed into the clamping ring of the clamp, tightening the clamp can fix the wind vane.

[0035] In the preferred embodiment, the extension line of the emission direction of the laser pointer 300 and the axial line of the center of the mounting hole are perpendicular to the central axis of the positioning main rod 110.

[0036] The clamping component 200 is located at one end of the positioning main rod 110, and the center of the mounting hole is located on the central axis of the positioning main rod 110.

[0037] In the preferred embodiment, one end of the laser pointer 300 is vertically mounted on the side wall of the positioning main rod 110. Since the clamping member 200 is mounted on one end of the positioning main rod 110 and the center of the mounting hole is located on the central axis of the positioning main rod 110, it can be determined that the extension line of the laser pointer 300's emission direction is perpendicular to and intersects the central axis of the positioning main rod 110. That is, the extension line of the laser pointer 300's emission direction, the axial line of the center of the mounting hole, and the central axis of the positioning main rod 110 are coplanar.

[0038] It should be noted that in this embodiment, the end of the positioning main rod 110 facing away from the clamping member 200 is connected to the base. Therefore, it can be determined that the clamping member 200 is located at one end of the positioning main rod 110. (See [reference]). Figure 1 In this embodiment, the clamping member 200 is located at the top of the positioning main rod 110. Thus, after the wind vane is installed onto the clamping member 200, the positioning main rod 110 can support the weight of the wind vane from the bottom, preventing the clamping member 200 from swaying. It should be noted that in this embodiment, after the final alignment of the wind vane's S pole with the vertical centerline of the machine head 500 is completed, the extension line of the laser pointer 300's emission direction ( Figure 1 a) Axial line of the center of the mounting hole ( Figure 1 (b) The central axis of the positioning main rod 110 ( Figure 1 The center line of the machine head (c) and the vertical center line of the machine head (500) are coplanar.

[0039] In the preferred embodiment, the positioning main rod 110 is provided with a threaded connection.

[0040] The positioning main rod 110 is connected to the fan base by a screw thread.

[0041] In the preferred embodiment, a screw hole or stud is provided on one end of the positioning main rod 110, and a corresponding threaded structure is provided on the base. The screw thread of the positioning main rod 110 is screwed into the threaded structure of the base, thereby realizing the detachable connection between the alignment fixture and the base.

[0042] In a preferred embodiment, the alignment fixture further includes a crossbar 400, one end of which is connected to the positioning main rod 110. The crossbar 400 is configured to drive the positioning main rod 110 to rotate and screw into the fan base under the action of external force.

[0043] In the preferred embodiment, the crossbar 400 is a cylindrical rod, which makes it easier to grip and operate. In this embodiment, one end of the crossbar 400 is connected to the side wall of the positioning main rod 110, and the crossbar 400 and the positioning main rod 110 are perpendicular to each other. As can be seen from the above, the positioning main rod 110 is screwed to the base, and the crossbar 400 drives the positioning main rod 110 to rotate, making the operation more effortless and convenient.

[0044] In a preferred embodiment, the positioning component 100 further includes a movable part 120, which is disposed on the positioning main rod 110, and the clamping member 200 is disposed on the movable part 120.

[0045] The moving part 120 moves relative to the positioning main rod 110 to change the relative position of the clamping member 200 on the positioning main rod 110.

[0046] In a preferred embodiment, the moving part 120 is configured to move along the axis of the positioning main rod 110. More specifically, the moving part 120 is used to change the position of the clamping member 200 at the top of the positioning main rod 110. In this way, the relative height position of the clamping member 200 at the top of the positioning main rod 110 can be changed by the moving part 120, thereby indirectly realizing the adjustment of the wind vane height position.

[0047] Example 7: See Figure 2 and Figure 3 As shown, in the aforementioned embodiment, the movable part 120 includes an elastic member 123 and a pressure cover 124.

[0048] Along the length of the positioning main rod 110, a receiving countersunk hole is provided from the end of the positioning main rod 110 toward the middle. An elastic element 123 is provided in the receiving countersunk hole. One end of the elastic element 123 located at the bottom of the receiving countersunk hole is connected to the inner wall of the receiving countersunk hole, and a clamping element 200 is provided at the other end of the elastic element 123.

[0049] The pressure cap 124 is provided with a through hole 1241, and the edge of the through hole 1241 is provided with a limiting edge 1242. The clamping member 200 passes through the through hole 1241 so that the pressure cap 124 is fitted onto the elastic member 123.

[0050] The pressure cap 124 is closed onto the positioning main rod 110 to connect to the end of the positioning main rod 110 that is provided with a receiving countersunk hole opening. The limiting edge 1242 acts on the end of the elastic member 123 that is connected to the clamping member 200 to compress the elastic member 123 and house it in the receiving countersunk hole.

[0051] In a preferred embodiment, since the clamping member 200 is located on the top of the positioning main rod 110, the receiving countersunk hole extends from the end where the clamping member 200 is located to the other end. Preferably, the elastic member 123 is a spring, with one end of the spring located at the bottom of the receiving countersunk hole connected to the bottom wall of the receiving countersunk hole. In its natural state, the top of the spring protrudes from the top of the receiving countersunk hole. The top of the pressure cap 124 is provided with a through hole 1241, and the inner edge of the through hole 1241 is provided with a limiting edge 1242. Specifically, the limiting edge 1242 is an annular edge.

[0052] In the preferred embodiment, in the initial state, the pressure cap 124 is closed onto the positioning main rod 110, and the pressure cap 124 is closed on the top of the receiving countersunk hole. At this time, the spring is compressed and fully retracted in the receiving countersunk hole. When the clamping member 200 needs to be adjusted along the axial direction of the positioning main rod 110 to adjust its position on the top of the positioning main rod 110, the pressure cap 124 is removed, and the top of the spring protrudes from the opening of the receiving countersunk hole, thereby pushing the clamping member 200 away from the opening of the receiving countersunk hole.

[0053] In a preferred embodiment, the moving part 120 further includes a mounting block 125, which is disposed at the end of the elastic member 123, and the clamping member 200 is disposed on the side of the mounting block 125 facing away from the elastic member 123.

[0054] In the preferred embodiment, the mounting block 125 is a circular block, and the diameter of the circular block is smaller than the inner diameter of the pressure cap 124, but larger than the inner diameter of the annular edge. Thus, the mounting block 125 cannot pass through the through hole 1241.

[0055] It should be noted that the mounting block 125 is located at the top of the spring, and the clamping member 200 is located on the side of the mounting block 125 facing away from the elastic member 123. In this way, the top of the mounting block 125 has a larger mounting surface, and the clamping member 200 is mounted on the mounting surface, making the installation of the clamping member 200 more stable.

[0056] In the preferred embodiment, the pressure cap 124 and the positioning main rod 110 are connected by threads.

[0057] In a preferred embodiment, the inner wall of the pressure cap 124 is provided with threads, and the outer wall of the top end of the positioning main rod 110 is provided with corresponding threads. The pressure cap 124 is screwed onto the threads of the positioning main rod 110.

[0058] It should be noted that the pressure cap 124 and the positioning main rod 110 are connected by threads. The threaded connection is more reliable and prevents the pressure cap 124 from being pushed out by the spring when the spring is fully compressed in the receiving countersunk hole. In addition, by gradually screwing the pressure cap 124 away from the positioning main rod 110, the top of the spring can be gradually released out of the opening of the receiving countersunk hole in a quantitative manner. This can effectively control the relative distance between the clamping member 200 and the top of the positioning main rod 110.

[0059] Example 8: Figure 4 for Figure 1 A schematic diagram of another implementation of the tooling for aligning the S pole of the weather vane.

[0060] See Figure 1 and Figure 4 As shown, the moving part 120 includes a hollow sliding rod 121 and a locking member 122. A slider is provided on the inner wall of the hollow sliding rod 121, and a groove is provided on the outer wall of the positioning main rod 110, with the slider disposed in the groove. The locking element 122 is movably mounted on the hollow sliding rod 121. The locking element 122 acts on the positioning main rod 110 to lock and position the hollow sliding rod 121.

[0061] In a preferred embodiment, at least one slider is provided on the circumferential direction of the inner wall of the hollow sliding rod 121. The number of sliders is not limited in this embodiment. The number of sliding grooves is the same as the number of sliders. The sliding grooves are arranged along the axial direction of the positioning main rod 110. The sliding end of the other sliding groove is located at the same end as the opening of the countersunk hole. That is, a notch is provided at the end of the sliding groove near the opening of the countersunk hole. A locking screw hole is provided on the side wall of the hollow sliding rod 121. The locking member 122 is a locking bolt, which is screwed into the locking screw hole.

[0062] It should be noted that the hollow sliding rod 121 is sleeved on the top of the positioning main rod 110, and the slider slides into the corresponding groove from the notch. In this way, the hollow sliding rod 121 can slide along the axis of the positioning main rod 110. Since the clamping member 200 is set on the hollow sliding rod 121, the clamping member 200 moves with the hollow sliding rod 121, thereby realizing the adjustment of the height position of the clamping member 200. In addition, the circumferential limit between the slider and the groove prevents the axial direction of the mounting hole of the hollow sliding rod 121 from changing during the sliding process.

Claims

1. A tooling for aligning the S pole of a weather vane, characterized in that: Includes a positioning component (100), a clamping component (200), and a laser pointer (300); The positioning component (100) includes a positioning main rod (110). The clamping member (200) is provided with mounting holes. The clamping member (200) and the laser pointer (300) are both set on the positioning main rod (110). The extension line of the emission direction of the laser pointer (300) is coplanar with the axial line of the center of the mounting hole. The plane where the extension line of the emission direction of the laser pointer (300) and the axial line of the center of the mounting hole are located is parallel to the central axis of the positioning main rod (110). The weather vane is installed in the mounting hole on the clamping member (200) and is clamped and fixed by the clamping member (200).

2. The alignment fixture for the S pole of a wind vane according to claim 1, characterized in that: The clamping component (200) is a clamp.

3. The alignment fixture for the S pole of a wind vane according to claim 1 or 2, characterized in that: The extension line of the emission direction of the laser pointer (300) and the axial line of the center of the mounting hole on the clamping member (200) are perpendicular to the central axis of the positioning main rod (110); The clamping member (200) is located at one end of the positioning main rod (110), and the center of the mounting hole is located on the central axis of the positioning main rod (110).

4. The alignment fixture for the S pole of a wind vane according to claim 1, characterized in that: The positioning main rod (110) is provided with a screw thread; The positioning main rod (110) is connected to the fan base by a screw thread.

5. The alignment fixture for the S pole of a wind vane according to claim 4, characterized in that: It also includes a crossbar (400), one end of which is connected to the positioning main rod (110). Under the action of external force, the crossbar (400) drives the positioning main rod (110) to rotate and screw into the fan base.

6. The alignment fixture for the S pole of a wind vane according to claim 3, characterized in that: The positioning component (100) further includes a movable part (120), which is disposed on the positioning main rod (110), and a clamping member (200) is disposed on the movable part (120); The movable part (120) can move relative to the positioning main rod (110) to change the relative position of the clamping member (200) on the positioning main rod (110).

7. The alignment fixture for the S pole of a wind vane according to claim 6, characterized in that: The movable part (120) includes an elastic element (123) and a pressure cap (124). Along the length of the positioning main rod (110), a receiving countersunk hole is provided from the end of the positioning main rod (110) toward the middle. An elastic element (123) is provided in the receiving countersunk hole. One end of the elastic element (123) at the bottom of the receiving countersunk hole is connected to the inner wall of the receiving countersunk hole. A clamping element (200) is provided at the other end of the elastic element (123). The pressure cap (124) is provided with a through hole (1241), and a limiting edge (1242) is provided on the edge of the through hole (1241). The clamping member (200) passes through the through hole (1241) so that the pressure cap (124) is sleeved on the elastic member (123); The pressure cap (124) is fitted onto the positioning main rod (110) to connect to the end of the positioning main rod (110) that is provided with a receiving countersunk hole opening. The limiting edge (1242) acts on the end of the elastic member (123) connected to the clamping member (200) to compress the elastic member (123) and house it in the receiving countersunk hole.

8. The alignment fixture for the S pole of a wind vane according to claim 7, characterized in that: The moving part (120) also includes a mounting block (125), which is disposed at the end of the elastic member (123), and a clamping member (200) is disposed on the side of the mounting block (125) opposite to the elastic member (123).

9. The alignment fixture for the S pole of a wind vane according to claim 7 or 8, characterized in that: The pressure cap (124) is connected to the positioning main rod (110) by a thread.

10. The alignment fixture for the S pole of a wind vane according to claim 8, characterized in that: The moving part (120) includes a hollow sliding rod (121) and a locking member (122). A slider is provided on the inner wall of the hollow sliding rod (121), and a groove is provided on the outer wall of the positioning main rod (110). The slider is disposed in the groove. The locking member (122) is movably mounted on the hollow sliding rod (121), and the locking member (122) acts on the positioning main rod (110) to lock and position the hollow sliding rod (121).

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