House building design field measurement auxiliary support convenient to install

Abstract

The utility model relates to a convenient-to-mount house building design field measurement auxiliary support which comprises a mounting table, a measuring instrument and a plurality of supporting assemblies, the measuring instrument is arranged at the upper end of the mounting table, the supporting assemblies are arranged on the lower end face of the mounting table, and mounting grooves in one-to-one correspondence with the supporting assemblies are formed in the lower end face of the mounting table; the supporting assembly comprises supporting feet and a connecting base arranged at the tops of the supporting feet, a sliding groove is formed in the connecting base, a compressed spring is arranged in the sliding groove, a protruding block is arranged at one end of the compressed spring, the connecting base is inserted into the mounting groove, a limiting groove for the protruding block to be inserted is formed in the groove wall of the mounting groove, and the compressed spring drives the protruding block to be located in the limiting groove. The supporting assembly further comprises sliding blocks, the sliding blocks are arranged in the sliding grooves in a sliding mode, and the sliding blocks are used for abutting against the protruding blocks so as to drive the protruding blocks to be disengaged from the limiting grooves. The device has the advantages that the connecting base is firmly installed, the supporting assembly is not prone to being separated from the mounting table, and meanwhile disassembly and storage are convenient.

Description

Technical Field

[0001] The present application relates to the field of architectural design, and in particular to an auxiliary bracket for on-site measurement of building design that is easy to install. Background Art

[0002] In architectural design, total stations can be used to determine the location and elevation of buildings, as well as to ensure that buildings are built at the specified location and height. In addition, total stations can also be used to measure building structures and components, which is very helpful for subsequent construction and maintenance. The tripod is a standard accessory for measuring instruments such as total stations, and is mainly used to support the measuring instrument so that the measuring instrument can stand stably on the ground or other platforms. The total station can accurately measure the height, width, length and other parameters of the building, providing effective support for the design and construction of the building.

[0003] The Chinese utility model patent with patent number CN218441659U discloses an auxiliary bracket for on-site measurement of building design, including a mounting platform, a fixing component arranged on the upper end surface of the mounting platform and fixing the measuring instrument, and a supporting component arranged on the lower end surface of the mounting platform and supporting the mounting platform. The supporting component includes a plurality of first legs arranged on the lower end surface of the mounting platform and a second leg rotatably arranged at the lower end of the first leg. A receiving groove for rotatably inserting the second leg is provided at one side end of the first leg close to the axis of the mounting platform, a mounting portion is provided at the upper end of the first leg, and a mounting groove for inserting the mounting portion is provided on the lower end surface of the mounting platform, so that the auxiliary bracket is easy to transport and carry.

[0004] In actual use, it is found that the tripod is installed in the installation slot in a plug-in manner. When the measuring instrument is moved, the tripod will be separated from the mounting platform, affecting the measurement efficiency. Utility Model Content

[0005] In order to prevent the tripod from being easily separated from the mounting platform after installation, the present application provides an auxiliary bracket for on-site measurement of building construction design that is easy to install.

[0006] This application provides an easy-to-install auxiliary bracket for on-site measurement of building design, which adopts the following technical solution:

[0007] An easy-to-install auxiliary support for on-site measurement of building design, comprising a mounting platform, a measuring instrument and a plurality of supporting components, wherein the measuring instrument is arranged at the upper end of the mounting platform, the supporting component is arranged at the lower end surface of the mounting platform, the lower end surface of the mounting platform is provided with mounting grooves corresponding to the plurality of supporting components one by one, the supporting component comprises a supporting foot and a connecting seat arranged at the top of the supporting foot, a sliding groove is arranged at one side of the connecting seat in the horizontal direction, a compression spring is arranged in the sliding groove, the elastic force direction of the compression spring is horizontal, a convex block is arranged at one end of the compression spring away from the bottom of the sliding groove, and the compression spring drives the end of the convex block to protrude out of the notch of the sliding groove;

[0008] The connecting seat is inserted into the installation groove, and the wall of the installation groove is provided with a limiting groove for the protrusion to be inserted, and the compression spring drives the protrusion to be located in the limiting groove; the side of the mounting platform is provided with sliding grooves corresponding to a plurality of limiting grooves, and the sliding grooves, limiting grooves and sliding grooves are arranged in a straight line, and the sliding grooves penetrate the mounting platform in the direction away from the limiting grooves; the supporting assembly also includes a sliding block, and the sliding block is slidably arranged in the sliding groove, and the sliding block is used to abut the protrusion to drive the protrusion out of the limiting groove; when the sliding block drives the protrusion out of the limiting groove, the end face of the sliding block is flush with the wall of the mounting groove with the limiting groove.

[0009] By adopting the above technical solution, when the user assembles the auxiliary bracket, he first presses the protrusion by hand to make the protrusion located in the sliding groove, and then inserts the connecting seat into the installation groove. The compression spring drives the protrusion to be inserted into the limiting groove, and the connecting seat is firmly installed, so that the support component is not easy to be separated from the installation platform; when disassembling the auxiliary bracket, the user presses the sliding block to make the sliding block abut against the protrusion and drive the protrusion out of the limiting groove, so that the support component is separated from the installation platform for easy storage.

[0010] Optionally, the support leg comprises a support tube, a telescopic column, a damping rotation shaft and a limit block, the top of the support tube is hinged on the connecting seat through the damping rotation shaft, the telescopic column is slidably arranged in the support tube, and the telescopic column slides in a direction away from or close to the connecting seat, the limit block is arranged on the side wall of the support tube, the inner wall of the support tube is provided with an arc groove, the limit block is provided with an arc piece matching the outer wall of the telescopic column, the arc piece is arranged in the arc groove, and a plug-in block is provided on the side of the arc piece facing away from the telescopic column, the limit block is provided with an abutment groove for the plug-in block to slide, and the plug-in block is slidably connected in the abutment groove; the support leg also includes a first bolt, a threaded through hole for threaded connection of the first bolt is provided on the limit block, and a through hole for the first bolt to pass through is provided on the side wall of the support tube, and when the first bolt rotates toward the telescopic column, the first bolt abuts the arc piece to drive the arc piece to slide and press against the telescopic column.

[0011] By adopting the above technical solution, the setting of the support tube allows the telescopic column to slide inside the support tube, and the length of the support assembly can be reduced, which is convenient for carrying. The arc groove opened in the support tube facilitates the accommodation of the arc piece, allowing the telescopic column to slide smoothly. The limit block is fixed to the side wall of the support tube, so that the first bolt abuts against the arc piece when it rotates toward the telescopic column, and the plug-in block slides and drives the arc piece to slide and abut against the telescopic column, so that the user can adjust the height of the support assembly according to their own needs.

[0012] Optionally, the sliding block protrudes out of the surface of the mounting table, and a limiting ring is provided on the sliding block, and the limiting ring slides in the sliding groove. A sliding cover corresponding to the sliding groove is provided on the side of the mounting table, and the sliding cover closes the sliding groove. An outer groove for the sliding block to slide is provided on the sliding cover, and the outer diameter of the limiting ring is larger than the inner diameter of the outer groove.

[0013] By adopting the above technical solution, the sliding block protrudes from the surface of the mounting table so that the user can press it smoothly. The limit ring and the sliding cover limit the sliding distance of the sliding block in the sliding groove, making it difficult for the sliding block to fall off the mounting table.

[0014] Optionally, a pair of torsion blocks protruding from the surface of the limit block are arranged on the end of the first bolt away from the telescopic column, and the torsion blocks are arranged opposite to each other.

[0015] By adopting the above technical solution, the relative arrangement of the torsion blocks makes it easy for the user to tighten and loosen the first bolt with less effort, thereby facilitating the sliding of the telescopic column.

[0016] Optionally, an insertion rod is provided at one end of the telescopic column away from the supporting tube, and a pointed head is provided at one end of the insertion rod away from the telescopic column.

[0017] By adopting the above technical solution, the pointed end on the insertion rod facilitates the support mechanism to be firmly supported on the ground and is not easy to slip.

[0018] Optionally, a groove is provided at one end of the telescopic column away from the supporting tube, and the end of the insertion rod away from the pointed end is arranged in the groove. It also includes a bolt assembly, and the bolt assembly includes a second bolt and a nut. A connecting hole is provided on the telescopic column, and the connecting hole passes through the telescopic column and the insertion rod. The second bolt passes through the connecting hole, and the nut is threadedly connected to the second bolt.

[0019] By adopting the above technical solution, when installing, the user only needs to place the insertion rod in the groove, pass the second bolt through the connecting hole, and fix the telescopic column on the insertion rod through the nut thread connection.

[0020] Optionally, a positioning block is provided on the side wall of the groove, and a receiving groove for receiving the positioning block is opened on the insertion rod, and the positioning block is arranged in the receiving groove.

[0021] By adopting the above technical solution, a positioning block is provided in the groove and a receiving groove is provided on the insertion rod, so that the insertion rod can be accurately positioned when installed, and the bolt assembly can be conveniently used to fix the insertion rod.

[0022] Optionally, a limiting block is provided at the end of the telescopic column close to the connecting seat, the outer diameter of the limiting block is larger than the outer diameter of the telescopic column, and the inner wall of the support tube is provided with a limiting groove for the limiting block to slide, and the limiting block slides away from or close to the connecting seat along the length direction of the limiting groove.

[0023] By adopting the above technical solution, the limiting block slides on the limiting groove, limiting the sliding distance of the telescopic column and preventing the telescopic column from sliding out of the supporting tube.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. During installation, the user inserts the connecting seat into the placement slot. At this time, the protrusion is located in the sliding slot and abuts against the side wall of the placement slot. When the connecting seat is located at the bottom of the placement slot, the protrusion is inserted into the limiting slot so that the connecting seat is firmly installed on the mounting table. The supporting component is not easy to be separated from the mounting table. A sliding block is provided on the side of the mounting table. When the user needs to disassemble, he only needs to press the sliding block to make the sliding block abut against the protrusion and drive the protrusion out of the limiting slot to complete the disassembly;

[0026] 2. When the user needs to adjust the height of the support assembly, the telescopic column is extended. When the telescopic column reaches a certain height, the first bolt is used to tighten the limit block. The first bolt drives the arc-shaped piece to abut against the telescopic column, so that the telescopic column is fixed at a suitable height;

[0027] 3. The setting of the limit ring and the sliding cover prevents the sliding block from sliding out of the mounting platform during sliding, thus playing a limiting role. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall schematic diagram of a conveniently installed on-site measurement auxiliary bracket for building construction design according to an embodiment.

[0029] Figure 2 It is a cross-sectional schematic diagram of the mounting platform of the embodiment, mainly showing the connecting seat and the mounting platform.

[0030] Figure 3 It is a cross-sectional schematic diagram of the telescopic column and the support tube of the embodiment, mainly showing the limit block, the arc piece and the telescopic column.

[0031] Figure 4 It is a cross-sectional schematic diagram of the telescopic column and the supporting tube of the embodiment.

[0032] Figure 5 It is a partial disassembly diagram of the embodiment, mainly showing the telescopic column and the insertion rod.

[0033] Description of the reference numerals: 1, mounting platform; 11, mounting groove; 12, limiting groove; 13, sliding groove; 14, inner ring groove; 15, limiting wall; 2, measuring instrument; 3, supporting assembly; 31, supporting foot; 311, supporting cylinder; 312, telescopic column; 313, damping rotation axis; 314, limiting block; 315, first bolt; 32, connecting seat; 33, sliding block; 34, sliding groove; 35, compression spring; 36, convex Block; 37, limit ring; 38, slide cover; 39, outer groove; 41, through hole; 42, arc groove; 43, arc sheet; 44, abutment groove; 46, threaded through hole; 47, torsion block; 48, plug-in block; 51, limit block; 52, limit groove; 61, plug rod; 62, pointed head; 63, receiving groove; 64, groove; 65, positioning block; 66, connecting hole; 7, bolt assembly; 71, second bolt; 72, nut. DETAILED DESCRIPTION

[0034] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] The present application embodiment discloses an auxiliary bracket for on-site measurement of building design that is easy to install. Figure 1 , Figure 2 The conveniently installed on-site measurement auxiliary bracket for building design includes a mounting platform 1, a measuring instrument 2 and three sets of support components 3. The measuring instrument 2 is fixed on the upper end surface of the mounting platform 1, and the support component 3 is arranged on the lower end surface of the mounting platform 1. The support component 3 includes a support leg 31 and a connecting seat 32 fixed on the top of the support leg 31. A sliding groove 34 is provided on one side of the connecting seat 32 in the horizontal direction. A compression spring 35 is fixed in the sliding groove 34. The elastic force direction of the compression spring 35 is horizontal. A convex block 36 is fixed at one end of the compression spring 35 away from the bottom of the sliding groove 34. The compression spring 35 drives the end of the convex block 36 to protrude out of the notch of the sliding groove 34.

[0036] Reference Figure 1 , Figure 2 The lower end surface of the mounting platform 1 is provided with three groups of mounting grooves 11 corresponding to the three groups of supporting components 3, the connecting seat 32 is inserted into the mounting groove 11, and the groove wall of the mounting groove 11 is provided with a limiting groove 12 for the protrusion 36 to be inserted. When the connecting seat 32 is located at the bottom of the mounting groove 11, the compression spring 35 drives the protrusion 36 to be located in the limiting groove 12.

[0037] Reference Figure 1 , Figure 2 The outer surface of the mounting platform 1 is provided with a plurality of sliding grooves 13 corresponding to the limiting grooves 12 one by one. The sliding grooves 13, the limiting grooves 12 and the sliding grooves 34 are arranged in a straight line. The sliding grooves 13 penetrate the mounting platform 1 in a direction away from the limiting grooves 12. The supporting assembly 3 further includes a sliding block 33, which slides in the sliding groove 13, and one end of the sliding block 33 away from the limiting groove 12 protrudes from the surface of the mounting platform 1, and the sliding block 33 is used to abut against the protrusion 36 to drive the protrusion 36 out of the limiting groove 12.

[0038] Reference Figure 1 , Figure 2 A limiting ring 37 is fixed on the sliding block 33. The outer diameter of the limiting ring 37 is larger than that of the sliding block 33. The limiting ring 37 slides in the sliding groove 13. A sliding cover 38 corresponding to the sliding groove 13 is fixed on the side of the mounting platform 1. The sliding cover 38 closes the sliding groove 13. The sliding cover 38 is provided with an outer groove 39 for the sliding block 33 to slide. An inner ring groove 14 is fixed on the inner wall of the sliding groove 13. The groove wall of the inner ring groove 14 close to the limiting groove 12 is the limiting wall 15. When the sliding block 33 drives the protrusion 36 to disengage from the limiting groove 12, the sliding block 33 abuts against the limiting wall 15. At this time, the end face of the sliding block 33 is flush with the groove wall of the limiting groove 12 provided in the mounting groove 11. When the connecting seat 32 is installed, the protrusion 36 drives the sliding block 33 to slide away from the limiting groove 12, and the limiting ring 37 abuts against the annular sliding cover 38 on the side away from the protrusion 36.

[0039] Reference Figure 1 , Figure 3 The support leg 31 includes a support tube 311, a telescopic column 312, a damping rotation shaft 313 and a stopper 314. The top of the support tube 311 is hinged on the connection seat 32 through the damping rotation shaft 313. The telescopic column 312 is slidably connected in the support tube 311, and the telescopic column 312 slides in a direction away from or close to the connection seat 32. The stopper 314 is fixed to the side wall of the support tube 311. The inner wall of the support tube 311 is provided with an arc groove 42. The stopper 314 is provided with an arc piece 43 matching the outer wall of the telescopic column 312. The arc piece 43 is slidably connected in the arc groove 42. Two opposite plug-in blocks 48 are fixed on the side of the arc piece 43 away from the telescopic column 312. The stopper 314 is provided with an abutment groove 44 for the plug-in block 48 to slide. The plug-in block 48 is slidably connected in the abutment groove 44.

[0040] Reference Figure 1 , Figure 3 , Figure 4 The support leg 31 also includes a first bolt 315, a threaded through hole 46 for the first bolt 315 to be threadedly connected is provided on the limit block 314, and a through hole 41 for the first bolt 315 to pass through is provided on the side wall of the support tube 311. A pair of torsion blocks 47 protruding from the surface of the limit block 314 are fixed on the end of the first bolt 315 away from the telescopic column 312, and the torsion blocks 47 are arranged opposite to each other. When the end of the first bolt 315 away from the torsion block 47 rotates out of the threaded through hole 46, when the first bolt 315 rotates toward the telescopic column 312, the first bolt 315 abuts against the arc-shaped piece 43 to drive the arc-shaped piece 43 to slide and press against the telescopic column 312. A limiting block 51 is fixed on the end of the telescopic column 312 close to the connecting seat 32, and the outer diameter of the limiting block 51 is larger than the outer diameter of the telescopic column 312. A limiting groove 52 for the limiting block 51 to slide is provided on the support tube 311. The limiting block 51 slides away from or close to the connecting seat 32 along the length direction of the limiting groove 52.

[0041] Reference Figure 5 The end of the telescopic column 312 away from the support tube 311 is fixed with an insertion rod 61, and the end of the telescopic column 312 away from the support tube 311 is provided with a groove 64, and positioning blocks 65 are fixed to the opposite side walls of the groove 64, and the insertion rod 61 is provided with a receiving groove 63 for accommodating the positioning block 65. The end of the insertion rod 61 away from the telescopic column 312 is fixed with a pointed head 62, and the end of the insertion rod 61 away from the pointed head 62 is fixed in the groove 64. When installed, the positioning block 65 is located in the receiving groove 63. The convenient installation of the on-site measurement auxiliary bracket for building design also includes a bolt assembly 7 for fixing the insertion rod 61, and the bolt assembly 7 includes a second bolt 71 and a nut 72. The telescopic column 312 is provided with a connecting hole 66, and the connecting hole 66 passes through the telescopic column 312 and the insertion rod 61. The second bolt 71 passes through the connecting hole 66, and the nut 72 is threadedly connected to the second bolt 71.

[0042] The implementation principle of the auxiliary bracket for on-site measurement of building design that is easy to install in the embodiment of the present application is as follows: when the user needs to assemble the auxiliary bracket, the connecting seat 32 on the support assembly 3 is inserted into the mounting platform 1, and the compression spring 35 drives the protrusion 36 to abut the limit block 314, so that the support assembly 3 is firmly installed, and at the same time, the insertion rod 61 is aligned with the groove 64, and the insertion rod 61 is fixed to the telescopic column 312 by the second bolt 71. When the height of the support assembly 3 needs to be adjusted, after the telescopic column 312 is slid to a suitable height, the first bolt 315 is used to make the arc piece 43 press against the telescopic column 312, so that the telescopic column 312 is fixed at a suitable angle. When disassembly is required, the user presses the sliding block 33 set on the side of the mounting platform 1 to separate the connecting seat 32 from the mounting platform 1, and at the same time unscrews the bolt assembly 7, the insertion rod 61 is separated from the telescopic column 312, and the disassembly is completed.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An auxiliary support for on-site measurement of building design that is easy to install, comprising a mounting platform (1), a measuring instrument (2) and a plurality of supporting components (3), wherein the measuring instrument (2) is arranged on the upper end of the mounting platform (1), and the supporting components (3) are arranged on the lower end surface of the mounting platform (1), characterized in that: The lower end surface of the mounting platform (1) is provided with mounting grooves (11) corresponding to a plurality of support assemblies (3) one by one. The support assemblies (3) include supporting feet (31) and connecting seats (32) arranged on the top of the supporting feet (31). A sliding groove (34) is provided on one side of the connecting seat (32) in the horizontal direction. A compression spring (35) is arranged in the sliding groove (34). The elastic force direction of the compression spring (35) is horizontal. A convex block (36) is arranged at one end of the compression spring (35) away from the bottom of the sliding groove (34). The compression spring (35) drives the end of the convex block (36) to protrude out of the notch of the sliding groove (34). The connecting seat (32) is inserted into the installation groove (11); the groove wall of the installation groove (11) is provided with a limit groove (12) for the protrusion (36) to be inserted; the compression spring (35) drives the protrusion (36) to be located in the limit groove (12); the side surface of the installation platform (1) is provided with a sliding groove (13) corresponding to a plurality of limit grooves (12) one by one; the sliding groove (13), the limit groove (12) and the sliding groove (34) are arranged in a straight line; the sliding groove (13) is moved away from the limit groove (12). The positioning groove (12) passes through the mounting platform (1); the support assembly (3) also includes a sliding block (33), the sliding block (33) is slidingly arranged in the sliding groove (13), and the sliding block (33) is used to abut against the protrusion (36) to drive the protrusion (36) out of the limiting groove (12); when the sliding block (33) drives the protrusion (36) out of the limiting groove (12), the end surface of the sliding block (33) is flush with the groove wall of the mounting groove (11) where the limiting groove (12) is provided.

2. The conveniently installed on-site measurement auxiliary bracket for building design according to claim 1 is characterized in that: The support leg (31) comprises a support tube (311), a telescopic column (312), a damping rotation shaft (313) and a limit block (314); the top of the support tube (311) is hinged on the connecting seat (32) through the damping rotation shaft (313); the telescopic column (312) is slidably arranged in the support tube (311); the telescopic column (312) slides in a direction away from or close to the connecting seat (32); the limit block (314) is arranged on the side wall of the support tube (311); an arc groove (42) is provided on the inner wall of the support tube (311); an arc piece (43) matching the outer wall of the telescopic column (312) is arranged on the limit block (314); the arc piece (43) is arranged in the arc groove (42); the arc A plug-in block (48) is arranged on a side of the sheet (43) facing away from the telescopic column (312); a contact groove (44) for the plug-in block (48) to slide is provided on the limit block (314); the plug-in block (48) is slidably connected in the contact groove (44); the support foot (31) also includes a first bolt (315); a threaded through hole (46) for the first bolt (315) to be threadedly connected is provided on the limit block (314); a through hole (41) for the first bolt (315) to pass through is provided on the side wall of the support tube (311); when the first bolt (315) rotates toward the telescopic column (312), the first bolt (315) abuts against the arc-shaped sheet (43) to drive the arc-shaped sheet (43) to slide and abut against the telescopic column (312).

3. The conveniently installed on-site measurement auxiliary bracket for building design according to claim 1 is characterized in that: The sliding block (33) protrudes from the surface of the mounting platform (1); a limiting ring (37) is arranged on the sliding block (33); the limiting ring (37) slides in the sliding groove (13); a sliding cover (38) corresponding to the sliding groove (13) is arranged on the side of the mounting platform (1); the sliding cover (38) closes the sliding groove (13); an outer groove (39) for the sliding block (33) to slide is opened on the sliding cover (38); the outer diameter of the limiting ring (37) is larger than the inner diameter of the outer groove (39).

4. The conveniently installed on-site measurement auxiliary bracket for building design according to claim 2 is characterized in that: A pair of torsion blocks (47) protruding from the surface of the limiting block (314) are arranged on the end of the first bolt (315) away from the telescopic column (312), and the torsion blocks (47) are arranged opposite to each other.

5. The conveniently installed on-site measurement auxiliary bracket for building design according to claim 2 is characterized in that: An insertion rod (61) is provided at one end of the telescopic column (312) away from the support tube (311), and a pointed head (62) is provided at one end of the insertion rod (61) away from the telescopic column (312).

6. The conveniently installed on-site measurement auxiliary bracket for building design according to claim 5 is characterized in that: The telescopic column (312) has a groove (64) at one end away from the support tube (311), and the end of the insertion rod (61) away from the pointed head (62) is arranged in the groove (64). The telescopic column (312) also includes a bolt assembly (7), and the bolt assembly (7) includes a second bolt (71) and a nut (72). The telescopic column (312) has a connecting hole (66), and the connecting hole (66) passes through the telescopic column (312) and the insertion rod (61). The second bolt (71) passes through the connecting hole (66), and the nut (72) is threadedly connected to the second bolt (71).

7. The conveniently installed on-site measurement auxiliary bracket for building design according to claim 6 is characterized in that: A positioning block (65) is provided on the side wall of the groove (64), and a receiving groove (63) for receiving the positioning block (65) is provided on the insertion rod (61), and the positioning block (65) is arranged in the receiving groove (63).

8. The conveniently installed on-site measurement auxiliary bracket for building design according to claim 2 is characterized in that: A limiting block (51) is provided at the end of the telescopic column (312) close to the connecting seat (32); the outer diameter of the limiting block (51) is larger than the outer diameter of the telescopic column (312); a limiting groove (52) for the limiting block (51) to slide is provided on the inner wall of the support tube (311); the limiting block (51) slides away from or close to the connecting seat (32) along the length direction of the limiting groove (52).

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