A ceiling type support for pipe gallery support

Abstract

The application relates to the field of pipe gallery support structures, in particular to a suspended ceiling type support for pipe gallery support, which comprises a plurality of bearing frames, a plurality of mounting seats and a plurality of cross pull rods, each bearing frame comprises a plurality of parallel arranged bearing cross beams and two vertically arranged bearing columns, the bearing columns are located at the two ends of the bearing cross beams and are detachably connected with the bearing cross beams; the mounting seat is located at the extended end of the bearing column, the mounting seat comprises a base fixed to the building top surface and a mounting rod connected with the base, the extended end of the bearing column is detachably connected with any position of the mounting rod; the cross pull rod is located between two adjacent bearing frames and the two ends are respectively detachably connected with the adjacent bearing columns. Through the flexible detachable connection mode, the application can adapt to the inclined or uneven building top surface, meanwhile, the stability and the bearing performance of the support are ensured, and the installation adaptability and the construction convenience are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of pipe gallery support structures, and in particular to a ceiling-mounted bracket for pipe gallery support. Background Technology

[0002] Ceiling-mounted supports are widely used in the field of utility tunnel support, providing crucial protection for modern building and infrastructure construction. In this field, with the acceleration of urbanization and technological advancements, higher demands are being placed on the safety, stability, and adaptability of building structures. As a key component of utility tunnel systems, ceiling-mounted supports not only need to bear the weight of pipelines and other equipment but also need to possess excellent installation adaptability to meet the construction needs of various complex environments.

[0003] During the installation of the scaffolding, when the building's roof surface is tilted or uneven, traditional scaffolding structures struggle to flexibly adjust their installation position. This can lead to tilting after installation, resulting in decreased overall stability and even insecure installation. This not only affects the scaffolding's load-bearing capacity but also increases construction difficulty and potential safety hazards. Utility Model Content

[0004] The purpose of this application is to overcome the above-mentioned technical problems and provide a ceiling-mounted bracket for pipe rack support.

[0005] A ceiling-mounted bracket for supporting pipe racks, comprising:

[0006] Multiple load-bearing frames, each load-bearing frame including multiple parallel load-bearing beams and two vertical load-bearing columns, the load-bearing columns being located at both ends of the load-bearing beams and detachably connected to the load-bearing beams, each load-bearing column connecting multiple load-bearing beams;

[0007] Multiple mounting bases are located at the extended ends of the supporting column. Each mounting base includes a base fixed to the building's roof surface and a mounting rod connected to the base. The extended ends of the supporting column are detachably connected to any position on the mounting rod.

[0008] Multiple cross tie rods are located between two adjacent load-bearing frames, and their ends are detachably connected to the adjacent load-bearing columns.

[0009] By adopting the above solution, when the building roof is not flat and is tilted, the support frame is difficult to adapt to the tilted or uneven building surface when the workers install it, resulting in the support frame not being installed securely. By setting the installation rod, the workers can control the distance between the load-bearing column and the building roof by fixing the end of the load-bearing column to any position on the installation rod, so as to adapt to the tilted or uneven building surface. Since the support frame occupies a large space, all parts of the support frame are detachable and connected to facilitate the transportation of the support frame.

[0010] In one embodiment, a first slot is formed on the supporting column, a second slot is formed on the supporting beam, and the widths of the supporting column and the supporting beam are equal. A connector is provided between the supporting beam and the supporting column. The connector includes a connecting plate and a mounting channel steel. The connecting plate is perpendicular to the mounting channel steel and is an integral structure with the mounting channel steel. The mounting channel steel is embedded in the second slot, and the connecting plate is embedded in the first slot.

[0011] By adopting the above solution, the load-bearing beam and the load-bearing column can be precisely abutted, avoiding misalignment between the load-bearing beam and the load-bearing column, which would lead to instability of the support. The connection is used to fix the load-bearing beam and the load-bearing column.

[0012] In one embodiment, the connecting plate includes two column mounting holes that mate with the supporting column. The column mounting holes are symmetrically arranged on the surface of the connecting plate with the bottom surface of the mounting channel steel as the symmetrical plane. The bottom surface of the mounting channel steel is provided with reinforcing ribs that connect with the connecting plate.

[0013] By adopting the above scheme, during actual use, the mounting channel steel will be subjected to the pressure of the load-bearing beam. The fixing points of the connecting plate and the load-bearing column are located on both sides of the contact surface between the mounting channel steel and the load-bearing beam, thereby evenly distributing the pressure of the load-bearing beam on both sides of the connecting plate and avoiding excessive local stress on the connecting plate, which could cause deformation.

[0014] In one embodiment, the load-bearing crossbeam has load-bearing fixing holes arranged in an array along its length. The load-bearing fixing holes are elongated. The mounting channel steel has multiple crossbeam mounting holes that mate with the load-bearing fixing holes along the length of the crossbeam. The crossbeam mounting holes are circular holes with the same diameter as the width of the load-bearing fixing holes.

[0015] By adopting the above scheme, the cooperation between the load-bearing fixing hole and the crossbeam mounting hole realizes the fixation between the load-bearing crossbeam and the mounting channel steel. By designing the mounting hole into a long strip shape, errors on the construction site can be effectively avoided. During the installation process, the crossbeam mounting hole can be matched with different load-bearing fixing holes, thereby realizing the fine adjustment of the bracket width.

[0016] In one embodiment, the supporting column includes a tie rod connecting part connected to the cross tie rod, and the tie rod connecting part includes two tie rod connecting holes on both sides that cooperate with the cross tie rod, and the tie rod connecting holes are elongated.

[0017] By adopting the above solution, the tie rod connection hole is set into a long strip shape. When there is a slight error in the size of the cross tie rod, the cross tie rod can still be adapted to the tie rod connection hole. By setting two tie rod connection holes, interference can be avoided after two adjacent cross tie rods are inserted into the connection hole.

[0018] In one embodiment, the tie rod connecting part is provided with tie rod connecting grooves on both sides to cooperate with the cross tie rod, the tie rod connecting groove is centered on the position of the column mounting hole, and the bottom surface of the mounting channel steel is the extended end of the tie rod connecting groove.

[0019] By adopting the above solution, the setting of the tie rod connecting groove can also avoid interference between adjacent cross tie rods and the load-bearing column during installation, and at the same time, it can minimize the possibility of errors in the length of the cross tie rods, which would make installation difficult.

[0020] In one embodiment, the connector further includes a connecting bolt and a connecting nut that mates with the connecting bolt. The connecting nut is located inside the bearing column. The connecting bolt mates with the column mounting hole. The connecting nut is provided with an abutment plate. The abutment plate is elliptical in shape and has the same length as the tie rod connecting groove.

[0021] By adopting the above scheme, the connection plate and the load-bearing column are fixed by rotating the connecting bolts during the actual installation process. During the rotation of the connecting bolts, the connecting bolts drive the abutment plate to rotate. During the rotation of the abutment plate, both ends of the abutment plate abut against the cross tie rods, thereby fixing the cross tie rods.

[0022] In one embodiment, the extended end of the bearing column is provided with a base plate, the mounting rod is fitted with a threaded sleeve, the threaded sleeve includes a threaded connecting section and a clamping section, the outer peripheral surface of the threaded connecting section is provided with threads and the threaded connecting section passes through the base plate, the clamping section is fixed to one end of the threaded connecting section, the outer peripheral surface of the clamping section is frustum-shaped and the outer peripheral surface of the clamping section is provided with a tightening opening in the generatrix direction.

[0023] By adopting the above solution, in actual use, the base plate can be fixed at any position on the mounting rod through the cooperation of the threaded sleeve and the nut.

[0024] In one embodiment, the base includes a rotating link, and the mounting rod is rotatably connected to the rotating link.

[0025] By adopting the above solution, when the building roof is tilted, the supporting column and the base installation will also be tilted. The rotational connection between the mounting rod and the rotating link allows the base to tilt in any direction, thus ensuring complete contact with the building roof while also ensuring that the supporting column remains vertical.

[0026] In one embodiment, the mounting base further includes a retaining pin and a sleeve, the sleeve sleeves the bearing column, a stop gear is provided on one side of the rotating connecting rod, and the retaining pin passes through the sleeve and engages with the tooth groove of the stop gear.

[0027] By adopting the above scheme, when the locking pin engages with the stop gear, the rotating connecting rod and the mounting rod can no longer rotate relative to each other, thereby allowing the base to be stably positioned at a fixed tilt angle.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. When the building's roof surface is uneven or tilted, the scaffolding may not be able to adapt to the tilted or uneven surface during installation, resulting in unstable installation. By using mounting rods, workers can control the distance between the load-bearing column and the building's roof surface by fixing the end of the load-bearing column to any position on the mounting rod, thus adapting to the tilted or uneven surface. Since the scaffolding occupies a large space, all parts of the scaffolding are detachable for easy transportation.

[0030] 2. By using connecting plates, tie rod connecting slots, and connecting nuts, interference between adjacent cross tie rods and load-bearing columns during installation can be avoided. This also minimizes the risk of length errors in the cross tie rods, which could hinder installation. During actual installation, the connecting bolts are rotated to fix the connecting plate to the load-bearing column. As the connecting bolts rotate, they drive the abutment plate to rotate, ensuring that both ends of the abutment plate abut against the cross tie rods, thus fixing the cross tie rods in place.

[0031] 3. When the building's roof is tilted, the supporting column and base will also be tilted. The rotating connection between the mounting rod and the rotating linkage allows the base to tilt in any direction, ensuring complete contact with the building's roof while keeping the supporting column vertical. Once the base's orientation is determined, a locking pin is inserted. When the locking pin engages with the stop gear, the rotating linkage and the mounting rod can no longer rotate relative to each other, thus allowing the base to remain stably at a fixed tilt angle. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a ceiling-mounted bracket for pipe gallery support provided in the first embodiment of this application.

[0033] Figure 2 It is an exploded view of the connection between the load-bearing beam and the load-bearing column.

[0034] Figure 3 This is a structural diagram of the connection between the load-bearing column and the mounting base.

[0035] Figure 4 yes Figure 3 Enlarged view of region A.

[0036] Figure 5 This is a structural schematic diagram of the connection between the connector and the bearing column in the second embodiment of this application.

[0037] Figure 6 This is a schematic diagram of the internal structure of the base according to the third embodiment of this application.

[0038] Explanation of reference numerals in the attached drawings: 1. Bearing frame; 11. Bearing beam; 111. Bearing fixing hole; 112. Second slot; 12. Bearing column; 121. Base plate; 122. Tie rod connection part; 123. First slot; 1221. Tie rod connection hole; 1222. Tie rod connection groove; 2. Mounting seat; 21. Base; 22. Mounting rod; 23. Threaded sleeve; 231. Threaded connection section; 232. Clamping section; 2321. Tightening opening; 24. Rotating connecting rod; 241. Stop gear; 25. Sleeve; 26. Pin; 3. Cross tie rod; 4. Connector; 41. Connecting plate; 411. Column mounting hole; 42. Mounting channel steel; 421. Reinforcing rib; 422. Beam mounting hole; 43. Connecting bolt; 44. Connecting nut; 441. Abutment plate; 5. Building top surface. Detailed Implementation

[0039] Therefore, it is necessary to provide a ceiling-mounted bracket for pipe gallery support that can be adapted to the inclined building roof 5. Example

[0040] Please see Figure 1-2 , Figure 1The first embodiment of this application provides a schematic diagram of a ceiling-mounted bracket for pipe gallery support, which includes: multiple mounting frames, multiple mounting bases 2 and multiple cross tie rods 3. The support frame 1 consists of multiple parallel support beams 11 and two vertical support columns 12. The support columns 12 are located at both ends of the support beams 11 and are detachably connected to them. Each support column 12 can connect to multiple support beams 11, allowing the support to simultaneously support various pipes. The mounting base 2 is located at the extended end of the support column 12 and includes a base 21 fixed to the building top surface 5 and a mounting rod 22 connected to the base 21. The extended end of the support column 12 is detachably connected to the mounting rod 22 at any position. The cross tie rod 3 is located between two adjacent support frames 1 and is used to connect the two adjacent support frames 1. The two ends of the cross tie rod 3 are detachably connected to the adjacent support columns 12. When the building top surface 5 is tilted, since the length of the support column 12 is constant, workers can control the distance between the support column 12 and the building top surface 5 by fixing the mounting end of the support column 12 to any position of the mounting rod 22, thereby ensuring that the connection lines between each support frame 1 are on the same horizontal line.

[0041] Specifically, the support frame 1 includes a support beam 11 and a support column 12. A second slot 112 is formed on the support beam 11, and a first slot 123 is formed on the support column 12. The support column 12 and the support beam 11 have the same width, ensuring that the support beam 11 and the support column 12 can abut together precisely, avoiding misalignment that could lead to instability of the support. The support beam 11 and the support column 12 can be made of U-shaped channel steel. The support beam 11 has support fixing holes 111 along its length. Pipes are supported on the support beam 11, and bolts pass through the support fixing holes 111 to fix the pipes to the support beam 11.

[0042] A connector 4 is provided between the load-bearing beam 11 and the load-bearing column 12. The connector 4 includes a connecting plate 41 and a mounting channel steel 42. The connecting plate 41 is perpendicular to the mounting channel steel 42 and is an integral structure with the mounting channel steel 42. The mounting channel steel 42 is embedded in the second slot 112, and the connecting plate 41 is embedded in the first slot 123. The connecting plate 41 has two column mounting holes 411 that mate with the load-bearing column 12. The column mounting holes 411 are symmetrically arranged on the surface of the connecting plate 41 with the bottom surface of the mounting channel steel 42 as the symmetrical plane. The bottom surface of the mounting channel steel 42 has reinforcing ribs 421 that connect to the connecting plate 41. The connecting plate 41 can be made of high-strength steel, while the mounting channel steel 42 can be made of aluminum alloy to reduce weight while ensuring strength.

[0043] The mounting channel steel 42 has multiple beam mounting holes 422 along the length of the crossbeam, which mate with the bearing fixing holes 111. The beam mounting holes 422 are circular, with a diameter identical to the width of the bearing fixing holes 111. Workers pass bolts through both the beam mounting holes 422 and the bearing fixing holes 111 simultaneously to fix the bearing crossbeam 11 to the mounting channel steel 42. The bearing fixing holes 111 are elongated to prevent dimensional errors during installation. During installation, workers can mate the beam mounting holes 422 with different bearing fixing holes 111 to fine-tune the width of the support. After installing the mounting channel steel 42 and the bearing crossbeam 11, bolts are passed through the column mounting holes 411 on the connecting plate 41 to fix the connecting plate 41 to the bearing column 12.

[0044] In this embodiment, the supporting column 12 includes a tie rod connecting part 122 connected to the cross tie rod 3. The tie rod connecting part 122 has two tie rod connecting holes 1221 on each side, which mate with the cross tie rod 3. The tie rod connecting holes 1221 are elongated. The cross tie rod 3 consists of two metal tie rods rotatably connected at the middle. The two ends of the metal tie rods are inserted into adjacent supporting columns 12 through the tie rod connecting holes 1221. The extended ends of the metal tie rods can be threaded, and the threaded connection with a nut secures the metal tie rod to the supporting column 12. By designing the tie rod connecting holes 1221 as elongated, even with slight dimensional errors in the cross tie rod 3, the cross tie rod 3 can still fit into the tie rod connecting holes 1221. By providing two tie rod connecting holes 1221, adjacent cross tie rods 3 can be misaligned during installation, thus preventing interference after two adjacent cross tie rods 3 are inserted into the connecting holes.

[0045] Please refer to the following: Figure 3-4 , Figure 3This is a structural diagram of the connection between the support column 12 and the mounting base 2. The extended end of the support column 12 is provided with a base plate 121. The base plate 121 is provided with a through hole that mates with the mounting rod 22. The mounting rod 22 is fitted with a threaded sleeve 23. The threaded sleeve 23 is fitted onto the mounting rod 22 and can slide along the length of the mounting rod 22. The inner wall surfaces of the mounting rod 22 and the threaded sleeve 23 can be fitted with a layer of rubber or a layer of damping particles to provide damping between the mounting rod 22 and the threaded sleeve 23, thereby facilitating precise length adjustment. The threaded sleeve 23 includes a threaded connecting section 231 and a clamping section 232. The outer circumferential surface of the threaded connecting section 231 is threaded and passes through a through hole in the base plate 121. The clamping section 232 is integrally formed with the threaded connecting section 231. The outer circumferential surface of the clamping section 232 is frustoconical. The outer circumferential surface of the clamping section 232 is provided with a shrinkage opening 2321 along the generatrix direction. During installation, the clamping section 232 is located on the side of the base plate 121 away from the base 21. A nut is provided on the outer circumferential surface of the threaded connecting section 231. When the nut is rotated, the threaded connecting section 231 drives the clamping section 232 to move towards the base 21. During the movement of the clamping section 232, the outer circumferential surface is squeezed by the through hole, and the shrinkage opening 2321 decreases, thereby clamping the mounting rod 22 and fixing the mounting rod 22 to the base plate 121. The mounting base 2 also includes a sleeve 25. After the mounting rod 22 is fixed to the base plate 121, the sleeve 25 is fitted between the mounting base 2 and the bearing column 12. The sleeve 25 and the mounting base 2 are fixed by the locking pin 26, thereby preventing the mounting rod 22 from rotating due to external force.

[0046] The working principle of this embodiment is as follows: the base plate 121 is slid along the mounting rod 22, so that the workers can fix the installation end of the bearing column 12 at any position on the mounting rod 22 through the cooperation between the threaded sleeve 23, the mounting rod 22 and the base plate 121, thereby controlling the distance between the bearing column 12 and the building top surface 5 to adapt to the inclined or uneven building surface and ensure that all bearing frames 1 are on the same horizontal line. Example

[0047] Please see Figure 5 , Figure 5 This is a schematic diagram of the connection between the connector 4 and the supporting column 12 in the second embodiment of this application. This embodiment is basically the same in structure as the previous embodiment, except that: tie rod connecting grooves 1222 are provided on both sides of the tie rod connecting part 122. The tie rod connecting groove 1222 is centered on the location of the column mounting hole 411, and the bottom surface of the mounting channel steel 42 is the extended end of the tie rod connecting groove 1222. The connector 4 preferably includes a connecting bolt 43 and a connecting nut 44 that mates with the connecting bolt 43. The connecting nut 44 is located inside the supporting column 12, and the connecting nut 44 has an abutment plate 441. The abutment plate 441 is elliptical in shape and its length is the same as that of the tie rod connecting groove 1222.

[0048] In actual use, first align the connecting nut 44 with the column mounting hole 411 so that the abutment plate 441 is embedded in the bearing column 12. Then, pass the tightening bolt through the connecting nut 44 and the tie rod connecting groove 1222, and then pass the cross tie rod 3 through both ends of the tie rod connecting groove 1222. During the rotation of the tightening bolt, the connecting nut 44 will drive the abutment plate 441 to rotate. The two ends of the abutment plate 441 abut against the cross tie rod 3, thereby fixing the cross tie rod 3 and also fixing the connecting plate 41 to the bearing column 12. Example

[0049] Please see Figure 6 , Figure 6 This is a schematic diagram of the internal structure of the base 21 in the third embodiment of this application. The structure of this embodiment is basically the same as that of the above embodiments, except that: the base 21 includes a rotating connecting rod 24, the mounting rod 22 is rotatably connected to the rotating connecting rod 24, and a stop gear 241 is provided on one side of the rotating connecting rod 24.

[0050] The working principle of this embodiment is as follows: Since the mounting rod 22 passes through the base 21, the base 21 can rotate around the mounting rod 22 in the horizontal plane. Since the rotating connecting rod 24 and the mounting rod 22 are rotatably connected, the tilt angle of the base 21 can be adjusted in the vertical plane. Therefore, the base 21 can tilt in any direction. So when the contact surface of the base 21 is tilted, causing the base 21 to not be able to fully fit with the building roof surface 5, the tilt angle of the base 21 can be adjusted so that the base 21 can fully fit with the building roof surface 5 which is tilted at different angles. The stop gear 241 is used to limit the relative rotation between the rotating connecting rod 24 and the mounting rod 22. After the angle of the base 21 is adjusted, the locking pin 26 passes through the sleeve 25 and engages with the tooth groove of the stop gear 241, thereby fixing the tilt angle of the base 21.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A ceiling-mounted bracket for supporting pipe racks, characterized in that, include: Multiple support frames (1), each of the support frames (1) includes multiple parallel support beams (11) and two vertically arranged support columns (12), the support columns (12) are located at both ends of the support beams (11) and are detachably connected to the support beams (11); Multiple mounting bases (2) are located at the extended ends of the supporting column (12). Each mounting base (2) includes a base (21) fixed to the building roof (5) and a mounting rod (22) connected to the base (21). The extended ends of the supporting column (12) are detachably connected to any position of the mounting rod (22). Multiple cross tie rods (3) are located between two adjacent load-bearing frames (1), and their ends are detachably connected to the adjacent load-bearing columns (12).

2. A ceiling-mounted support for pipe racks according to claim 1, characterized in that: A first slot (123) is formed on the supporting column (12), and a second slot (112) is formed on the supporting beam (11). The widths of the supporting column (12) and the supporting beam (11) are equal. A connector (4) is provided between the supporting beam (11) and the supporting column (12). The connector (4) includes a connecting plate (41) and a mounting channel steel (42). The connecting plate (41) is perpendicular to the mounting channel steel (42) and is integral with the mounting channel steel (42). The mounting channel steel (42) is embedded in the second slot (112), and the connecting plate (41) is embedded in the first slot (123).

3. A ceiling-mounted bracket for pipe gallery support according to claim 2, characterized in that: The connecting plate (41) includes two column mounting holes (411) that cooperate with the bearing column (12). The column mounting holes (411) are symmetrically arranged on the surface of the connecting plate (41) with the bottom surface of the mounting channel steel (42) as the symmetrical plane. The bottom surface of the mounting channel steel (42) is provided with reinforcing ribs (421) that are connected to the connecting plate (41).

4. A ceiling-mounted support for pipe racks according to claim 2, characterized in that: The load-bearing crossbeam (11) has load-bearing fixing holes (111) arranged in an array along its length. The load-bearing fixing holes (111) are elongated. The mounting channel steel (42) has multiple crossbeam mounting holes (422) that cooperate with the load-bearing fixing holes (111) along the length of the crossbeam. The crossbeam mounting holes (422) are round holes with the same diameter as the width of the load-bearing fixing holes (111).

5. A ceiling-mounted bracket for pipe gallery support according to claim 3, characterized in that: The supporting column (12) includes a tie rod connecting part (122) connected to the cross tie rod (3). The tie rod connecting part (122) includes two tie rod connecting holes (1221) on both sides that cooperate with the cross tie rod (3). The tie rod connecting holes (1221) are elongated.

6. A ceiling-mounted bracket for pipe gallery support according to claim 5, characterized in that: The tie rod connecting part (122) is provided with tie rod connecting grooves (1222) on both sides to cooperate with the cross tie rod (3). The tie rod connecting groove (1222) is centered on the position of the column mounting hole (411), and the bottom surface of the mounting channel steel (42) is the extension end of the tie rod connecting groove (1222).

7. A ceiling-mounted bracket for pipe gallery support according to claim 6, characterized in that: The connector (4) further includes a connecting bolt (43) and a connecting nut (44) that mates with the connecting bolt (43). The connecting nut (44) is located inside the bearing column (12). The connecting bolt (43) mates with the column mounting hole (411). The connecting nut (44) is provided with an abutment plate (441). The abutment plate (441) is elliptical and has the same length as the tie rod connecting groove (1222).

8. A ceiling-mounted support for pipe gallery support according to claim 1, characterized in that: The extended end of the bearing column (12) is provided with a base plate (121). The mounting rod (22) is fitted with a threaded sleeve (23). The threaded sleeve (23) includes a threaded connecting section (231) and a clamping section (232). The outer circumferential surface of the threaded connecting section (231) is provided with threads and the threaded connecting section (231) passes through the base plate (121). The clamping section (232) is fixed at one end of the threaded connecting section (231). The outer circumferential surface of the clamping section (232) is frustum-shaped and a shrinkage opening (2321) is provided in the generatrix direction of the outer circumferential surface of the clamping section (232).

9. A ceiling-mounted support for pipe gallery support according to claim 1, characterized in that: The base (21) includes a rotating link (24), and the mounting rod (22) is rotatably connected to the rotating link (24).

10. A ceiling-mounted support for pipe gallery support according to claim 9, characterized in that: The mounting base (2) also includes a locking pin (26) and a sleeve (25). The sleeve (25) is fitted onto the bearing column (12). A stop gear (241) is provided on one side of the rotating connecting rod (24). The locking pin (26) passes through the sleeve (25) and engages with the tooth groove of the stop gear (241).

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