Crane and method for assembling large-span steel-concrete thin-shell roof steel framework

Abstract

The invention discloses a crane for assembling a large-span steel-concrete thin-shell roof steel framework and a method thereof, and belongs to the technical field of thin-shell roof construction. The device comprises a mounting ring, a mounting piece is mounted on the inner side wall of the mounting ring, a connecting hole is formed in the mounting piece, a sliding rod is mounted in the connecting hole in a penetrating mode, a limiting disc is mounted at the upper end of the sliding rod, and a mounting disc is mounted at the upper end of the limiting disc; a supporting column is mounted at the upper end of the mounting disc, a rotating seat is mounted at the upper end of the supporting column, a machine body is mounted at the upper end of the rotating seat, and a suspension arm is mounted on the machine body. A traditional bolt connection mode is abandoned, a series of potential safety hazards and structural stability problems caused by long-term stress damage of bolts are avoided, stable operation of a crane in the steel skeleton hoisting process is effectively guaranteed, and operation safety and reliability are improved.

Description

Technical Field

[0001] The invention relates to the technical field of thin-shell roof construction, and more particularly to a crane and a method for assembling a steel frame of a large-span steel-concrete thin-shell roof. Background Art

[0002] In the field of construction, the construction of large-span steel-concrete composite thin-shell roofs is increasing, and steel frame assembly cranes play a vital role in their construction process. Such cranes usually need to be transferred according to different construction sites to meet the use requirements of multiple project locations. At present, most of the existing cranes for steel frame assembly on the market are assembled and fixed by bolt connection, which is a more traditional and widely used connection method. When the crane is working normally, especially when lifting the steel frame of the large-span steel-concrete composite thin-shell roof, it needs to withstand huge forces, which will be transmitted to the connection parts through various components. With the increase of service time and the increase of the number of lifting times, the bolts are under this high-load stress state for a long time, which is prone to loosening, deformation, or even breakage, which in turn affects the overall structural stability and safety of the crane, and also brings many inconveniences to subsequent maintenance and re-disassembly.

[0003] The existing large-span steel-concrete composite thin-shell roof steel frame assembly crane relies on bolts to fix and assemble components, which has obvious shortcomings. On the one hand, although the bolt connection has a certain degree of tightness, facing the frequent and high-intensity forces generated during the crane lifting operation, the reliability of the bolt will be greatly reduced after long-term use. Once the bolts are loose, gaps will appear in the connection between the components, causing abnormal vibrations in the crane during operation, which will not only affect the lifting accuracy, but may also further aggravate the wear of the components and shorten the service life of the equipment. On the other hand, since different construction projects have different requirements for the size and specifications of the crane, each time the bolts are disassembled and assembled, the operation is cumbersome, and a lot of manpower and time are required to install and remove the bolts one by one. In addition, for cranes of different sizes, the adaptability is poor, and it is difficult to achieve fast, convenient and universal disassembly and assembly, which greatly reduces the construction efficiency and increases the construction cost, and cannot well meet the current requirements of efficient construction. To this end, it is necessary to design a new technical solution to solve it. Summary of the invention

[0004] 1. Technical problem to be solved by the invention

[0005] In view of the defects and shortcomings of the prior art, the present invention provides a crane and a method for assembling a steel frame of a large-span steel-concrete thin-shell roof. The device is easy to manufacture, convenient to install, highly targeted, simple to operate, improves construction efficiency, ensures project quality, reduces project costs, and has good economic and social benefits.

[0006] 2. Technical Solution

[0007] To achieve the above object, the technical solution provided by the present invention is as follows:

[0008] A crane for assembling a steel skeleton of a long-span steel-concrete thin-shell roof of the present invention includes a mounting ring, and a mounting member is installed on the inner side wall of the mounting ring. Two symmetrical first sliding grooves are opened on the mounting member, and two groups of symmetrical semi-circular grooves are opened at the lower end of the mounting member. A fixed clamp is installed in any one of the first sliding grooves, and a round rod is installed through any one of the fixed clamps, and the round rod is adapted to the semi-circular groove;

[0009] A connection hole is opened on the mounting member, a sliding rod is installed through the connection hole, a limiting disk is installed at the upper end of the sliding rod, a mounting rod is installed on the sliding rod, and a mounting disk is installed at the upper end of the limiting disk;

[0010] A second installation groove is opened at one end of the mounting disk close to the sliding rod, and the second installation groove is fitted with the limiting disk. A first installation groove is opened at the end of the mounting disk far from the sliding rod, and the fixed clamp is engaged with the first installation groove;

[0011] A support column is installed at the upper end of the mounting disk, a rotating seat is installed at the upper end of the support column, a body is installed at the upper end of the rotating seat, a boom is installed on the body, a steel wire rope is installed on the boom, and a hook is installed at the bottom end of the steel wire rope.

[0012] Further, two symmetrical fixing members are installed at the lower end of the mounting member, the fixing members are connected to the inner side wall of the mounting ring, second sliding grooves are opened on the fixing members, sliders are installed in the second sliding grooves, and the upper ends of the sliders are respectively connected to the corresponding fixed clamps.

[0013] Further, a tooth groove is opened on the mounting rod, a gear is installed on one side of the mounting rod, the gear is engaged with the tooth groove, a transmission shaft is installed on the gear, one end of the transmission shaft is connected with a motor, and a mounting seat is arranged on the outer circle of the motor, and the mounting seat is connected to the inner side wall of the mounting ring.

[0014] Further, an attitude sensor is installed at one end of the rotating seat close to the support column, a buzzer is installed at the end of the body far from the rotating seat, and the buzzer is electrically connected to the attitude sensor.

[0015] Further, a connecting rod is installed on the boom, a cleaning ring is installed at the other end of the connecting rod, bristles are installed in the cleaning ring, and the steel wire rope passes through the cleaning ring.

[0016] Further, a base is installed outside the mounting ring, a plurality of mounting holes are opened on the base, and a ground nail is installed in any one of the mounting holes, and the ground nail is adapted to the mounting hole.

[0017] Further, a plurality of connecting grooves are formed in the base, threaded grooves are formed in the connecting grooves, threaded rods are installed in the connecting grooves, the threaded rods are matched with the threaded grooves, a first counterweight block is installed at one end of the threaded rod away from the base, a second counterweight block is arranged on the top of the first counterweight block, clamping grooves are formed on the upper surfaces of the first counterweight block and the second counterweight block, correspondingly, a clamping block is installed at the bottom of the second counterweight block, and the second counterweight block is clamped in the clamping groove on the top of the first counterweight block through the clamping block.

[0018] An installation method of a crane for assembling a steel skeleton of a long-span steel-concrete thin-shell roof:

[0019] When an object needs to be lifted, place the base on the ground, then nail the ground nails to the ground through the installation holes to stably fix it;

[0020] Adjust the number of counterweight blocks according to the weight of the object to be lifted. When in use, first install the first counterweight block into the connecting groove through the threaded rod at the bottom end, and then adjust the number of second counterweight blocks according to the required weight. Install the second counterweight block into the clamping groove formed on the first counterweight block through the clamping block at the bottom end;

[0021] Then start the motor. The motor drives the gear to rotate through the transmission shaft. The gear drives the installation rod engaged with it to move upward. When the installation rod moves, it drives the sliding rod to move upward. The sliding rod drives the limiting disc to move upward so that it is clamped into the second installation groove at the lower end of the installation disc, and the limiting disc pushes the installation disc upward;

[0022] When the installation disc moves upward, it synchronously drives the two fixing clips to move upward. Since the lower end of the fixing clip is locked under the action of the round rod and the semi-circular groove, the installation disc is locked and stops moving upward. When disassembly is required, control the motor to rotate in the reverse direction; The position of the round rod at the bottom end of the fixing clip in the semi-circular groove can be adjusted according to the diameter of the installation disc.

[0023] 3. Beneficial effects

[0024] Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects:

[0025] The present invention abandons the traditional bolt connection method, avoiding a series of safety hazards and structural stability problems caused by the long-term stress damage of bolts, effectively ensuring the smooth operation of the crane during the lifting of the steel skeleton, and improving the safety and reliability of the operation. Secondly, this disassembly and assembly structure has good versatility. No matter what size and specification of the crane, simple and efficient disassembly and assembly operations can be achieved. Compared with the traditional method of fixing by bolts, the labor and time costs required for disassembly and assembly are greatly reduced, enabling the crane to be quickly transferred and reassembled at different construction sites, significantly improving the construction efficiency, better meeting the needs of frequent site transfers in modern building construction, and having strong practical value and market promotion prospects.

[0026] Through the designed configuration block of the present invention, the number of counterweight blocks can be adjusted according to the weight of the object to be lifted, and any two adjacent counterweight blocks are connected by a clamping block and a clamping groove, which is extremely convenient for disassembly and assembly, greatly increasing the operation speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the front view of the present invention;

[0028] Figure 2 is the structure diagram of the body and boom of the present invention;

[0029] Figure 3 is the top view structure diagram of the mounting plate of the present invention;

[0030] Figure 4 is the bottom view structure diagram of the mounting plate of the present invention;

[0031] Figure 5 is the structure diagram of the mounting member and the fixing clip of the present invention;

[0032] Figure 6 is the sliding rod and the limiting disk of the present invention;

[0033] Figure 7 is the structure diagram of the gear and the transmission shaft of the present invention;

[0034] Figure 8 is the structure diagram of the base of the present invention;

[0035] Figure 9 is the structure diagram of the first counterweight block and the second counterweight block of the present invention.

[0036] In the figure: 120, support column; 121, rotating base; 122, body; 130, boom; 131, steel wire rope; 132, hook; 140, connecting rod; 141, cleaning ring; 150, attitude sensor; 151, buzzer; 160, mounting plate; 161, first mounting groove; 162, second mounting groove; 170, mounting ring; 210, mounting part; 211, first sliding groove; 212, semi-circular groove; 213, fixed clamp; 214, round rod; 215, slider; 216, connecting hole; 217, fixing part; 218, second sliding groove; 220, sliding rod; 221, limiting disc; 222, mounting rod; 230, mounting seat; 231, motor; 232, transmission shaft; 233, gear; 310, base; 320, mounting hole; 330, ground nail; 340, connecting groove; 350, threaded rod; 360, first counterweight; 370, clamping block; 380, second counterweight; 390, clamping groove. Detailed implementation mode

[0037] The present invention will be further described below in conjunction with the drawings and embodiments:

[0038] Embodiment 1

[0039] From Figures 1-9 It can be seen that a crane for assembling a steel skeleton of a large-span steel-concrete thin-shell roof in this embodiment includes a mounting ring 170. A mounting part 210 is installed on the inner side wall of the mounting ring 170. Two symmetrical first sliding grooves 211 are opened on the mounting part 210. Two groups of symmetrical semi-circular grooves 212 are opened at the lower end of the mounting part 210. A fixed clamp 213 is installed in any one of the first sliding grooves 211. A round rod 214 penetrates through any one of the fixed clamps 213, and the round rod 214 is adapted to the semi-circular groove 212;

[0040] A connecting hole 216 is opened on the mounting part 210. A sliding rod 220 penetrates through the connecting hole 216. A limiting disc 221 is installed at the upper end of the sliding rod 220. A mounting rod 222 is installed on the sliding rod 220. A mounting plate 160 is installed at the upper end of the limiting disc 221;

[0041] A second mounting groove 162 is opened at one end of the mounting plate 160 close to the sliding rod 220. The second mounting groove 162 is fitted with the limiting disc 221. A first mounting groove 161 is opened at one end of the mounting plate 160 away from the sliding rod 220. The fixed clamp 213 is engaged with the first mounting groove 161;

[0042] A support column 120 is installed at the upper end of the mounting plate 160. A rotating base 121 is installed at the upper end of the support column 120. A body 122 is installed at the upper end of the rotating base 121. A boom 130 is installed on the body 122. A steel wire rope 131 is installed on the boom 130. A hook 132 is installed at the bottom end of the steel wire rope 131.

[0043] Two symmetrical fixing members 217 are installed at the lower end of the mounting member 210. The fixing members 217 are connected to the inner side wall of the mounting ring 170. Second sliding grooves 218 are formed in the fixing members 217. Sliders 215 are installed in the second sliding grooves 218. The upper ends of the sliders 215 are respectively connected to the corresponding fixing clips 213, which can prevent the fixing clips 213 from detaching from the mounting member 210 when the fixing clips 213 are separated from the mounting disc 160, greatly saving the installation time for the next time.

[0044] A toothed groove is formed in the mounting rod 222. A gear 233 is installed on one side of the mounting rod 222. The gear 233 meshes with the toothed groove. A transmission shaft 232 is installed on the gear 233. One end of the transmission shaft 232 is connected to a motor 231. An outer ring of the motor 231 is provided with a mounting seat 230. The mounting seat 230 is connected to the inner side wall of the mounting ring 170.

[0045] By starting the motor 231, the motor 231 drives the gear 233 to rotate through the transmission shaft 232. The gear 233 drives the engaged mounting rod 222 to move upward. When the mounting rod 222 moves upward, it drives the sliding rod 220 to move upward. When the sliding rod 220 moves upward, it drives the limiting disc 221 to move upward so that it is engaged in the second mounting groove 162 at the lower end of the mounting disc 160.

[0046] An attitude sensor 150 is installed at one end of the rotating seat 121 close to the support column 120. A buzzer 151 is installed at one end of the body 122 away from the rotating seat 121. The buzzer 151 is electrically connected to the attitude sensor 150. The attitude sensor 150 can effectively detect the horizontal angle of the entire device and can control the buzzer 151 to emit a harsh sound when the tilt angle is too large to warn the staff to operate in time.

[0047] A connecting rod 140 is installed on the boom 130. The other end of the connecting rod 140 is installed with a cleaning ring 141. Brush hairs are installed in the cleaning ring 141. The steel wire rope 131 passes through the cleaning ring 141. When the steel wire rope 131 expands and contracts, it moves relatively within the cleaning ring 141. The brush hairs in the cleaning ring 141 can effectively clean the steel wire rope 131.

[0048] A base 310 is installed outside the mounting ring 170. A plurality of mounting holes 320 are formed in the base 310. A ground nail 330 is installed in any one of the mounting holes 320. The ground nail 330 is adapted to the mounting hole 320. When the entire device needs to be used, the base 310 is placed on the ground, and then the ground nail 330 is nailed into the ground through the mounting hole 320 to fix it.

[0049] The base 310 is provided with a plurality of connecting grooves 340. Threaded grooves are provided in the connecting grooves 340. Threaded rods 350 are installed in the connecting grooves 340. The threaded rods 350 are matched with the threaded grooves. One end of the threaded rod 350 away from the base 310 is installed with a first counterweight 360. A second counterweight 380 is arranged on the top of the first counterweight 360. Card slots 390 are provided on the upper surfaces of the first counterweight 360 and the second counterweight 380. Correspondingly, a clamping block 370 is installed at the bottom of the second counterweight 380. The second counterweight 380 is clamped in the card slot 390 on the top of the first counterweight 360 through the clamping block 370;

[0050] The number of counterweights can be adjusted according to the weight of the object to be lifted. When in use, first install the first counterweight 360 into the connecting groove 340 through the threaded rod 350 at the bottom end, and then install the second counterweight 380 into the card slot 390 provided on the first counterweight 360 through the clamping block 370 at the bottom end according to the required weight; and any two adjacent counterweights are connected through the clamping block 370 and the card slot 390, which is extremely convenient for disassembly and assembly;

[0051] Embodiment 2

[0052] From Figures 1-9 It can be seen that the installation method of a crane for assembling a large-span steel-concrete thin-shell roof steel skeleton in this embodiment:

[0053] When an object needs to be lifted, place the base 310 on the ground according to the place where the whole device needs to be used, and then nail the ground nail 330 into the ground through the installation hole 320 to firmly fix it;

[0054] Adjust the number of counterweights according to the weight of the object to be lifted. When in use, first install the first counterweight 360 into the connecting groove 340 through the threaded rod 350 at the bottom end, and then adjust the number of the second counterweights 380 according to the required weight, and install the second counterweights 380 into the card slots 390 provided on the first counterweight 360 through the clamping blocks 370 at the bottom ends;

[0055] Then start the motor 231. The motor 231 drives the gear 233 to rotate through the transmission shaft 232. The gear 233 drives the installation rod 222 engaged with it to move upward. When the installation rod 222 moves, it drives the sliding rod 220 to move upward. The sliding rod 220 drives the limiting disc 221 to move upward so that it is clamped into the second installation groove 162 at the lower end of the installation disc 160, and the limiting disc 221 pushes the installation disc 160 upward;

[0056] When the mounting plate 160 moves upward, the two fixing clips 213 are simultaneously driven to move upward. Since the lower ends of the fixing clips 213 are locked by the round rod 214 and the semicircular groove 212, the mounting plate 160 is locked and stops moving upward. When disassembly is required, the motor 231 can be controlled to rotate in the opposite direction. The position of the round rod 214 at the bottom end of the fixing clip 213 in the semicircular groove 212 can be adjusted according to the diameter of the mounting plate 160.

[0057] The purpose of the present invention is to provide a crane for assembling a steel frame of a large-span steel-concrete thin-shell roof, so as to solve the problem that although the current bolt connection has a certain degree of tightness, the reliability of the bolt will be greatly reduced after long-term use in the face of frequent and high-intensity forces generated during crane lifting operations. Once the bolts are loose, gaps will appear in the connections between the components, causing abnormal vibrations in the crane during operation, which not only affects the lifting accuracy, but may also further aggravate the wear of the components and shorten the service life of the equipment. On the other hand, since different construction projects have different requirements for the size and specifications of the crane, each time the bolts are disassembled and assembled, the operation is cumbersome, and a large amount of manpower and time are required to install and remove the bolts one by one. In addition, for cranes of different sizes, the adaptability is poor, and it is difficult to achieve fast, convenient and universal disassembly and assembly, which greatly reduces the construction efficiency and increases the construction cost, and cannot well meet the technical problems of the current requirements for efficient construction.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] The present invention abandons the traditional bolt connection method, avoids a series of safety hazards and structural stability problems caused by long-term stress damage to the bolts, effectively ensures the smooth operation of the crane during the lifting of the steel frame, and improves the safety and reliability of the operation. Secondly, this disassembly and assembly structure has good versatility, and can achieve simple and efficient disassembly and assembly operations regardless of the size of the crane. Compared with the traditional method of relying on bolt fixing, the manpower and time costs required for disassembly and assembly are greatly reduced, allowing the crane to be quickly transferred and reassembled in different construction sites, significantly improving construction efficiency, and better adapting to the needs of frequent transfers in modern construction. It has strong practical value and market promotion prospects.

[0060] The configuration block designed in the present invention can adjust the number of counterweight blocks according to the weight of the object to be lifted, and any two adjacent counterweight blocks are connected to the card slot through the card block, which is very convenient for disassembly and assembly, greatly increasing the speed of the operation.

[0061] The above has schematically described the present invention and its embodiments. This description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by this and, without departing from the gist of the present invention, design similar structural modes and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A crane for assembling the steel skeleton of a large-span steel-concrete thin-shell roof, comprising a mounting ring (170), characterized in that: An installation member (210) is installed on the inner side wall of the installation ring (170). Two symmetrical first sliding grooves (211) are provided on the installation member (210). Two groups of symmetrical semi-circular grooves (212) are provided at the lower end of the installation member (210). A fixing clip (213) is installed in any one of the first sliding grooves (211). A round rod (214) is installed through any one of the fixing clips (213). The round rod (214) is adapted to the semi-circular groove (212). A connection hole (216) is provided on the installation member (210). A sliding rod (220) is installed through the connection hole (216). A limit disk (221) is installed at the upper end of the sliding rod (220). An installation rod (222) is installed on the sliding rod (220). An installation disk (160) is installed at the upper end of the limit disk (221). A second installation groove (162) is provided at one end of the installation disk (160) close to the sliding rod (220). The second installation groove (162) is fitted with the limit disk (221). A first installation groove (161) is provided at one end of the installation disk (160) away from the sliding rod (220). The fixing clip (213) is engaged with the first installation groove (161). A support column (120) is installed at the upper end of the installation disk (160). A rotating seat (121) is installed at the upper end of the support column (120). A machine body (122) is installed at the upper end of the rotating seat (121). A lifting arm (130) is installed on the machine body (122). A steel wire rope (131) is installed on the lifting arm (130). A hook (132) is installed at the bottom end of the steel wire rope (131).

2. The crane for assembling the steel skeleton of a long-span steel-concrete thin-shell roof according to claim 1, wherein: Two symmetrical fixing members (217) are installed at the lower end of the installation member (210). The fixing members (217) are connected to the inner side wall of the installation ring (170). Second sliding grooves (218) are provided on the fixing members (217). Sliders (215) are installed in the second sliding grooves (218). The upper ends of the sliders (215) are respectively connected to the corresponding fixing clips (213).

3. The crane for assembling the steel skeleton of a long-span steel-concrete thin-shell roof according to claim 2, wherein: A tooth groove is provided on the installation rod (222). A gear (233) is installed on one side of the installation rod (222). The gear (233) is engaged with the tooth groove. A transmission shaft (232) is installed on the gear (233). One end of the transmission shaft (232) is connected to a motor (231). An outer ring of the motor (231) is provided with an installation seat (230). The installation seat (230) is connected to the inner side wall of the installation ring (170).

4. The crane for assembling the steel skeleton of a long-span steel-concrete thin-shell roof according to claim 3, characterized in that: An attitude sensor (150) is installed at one end of the rotating seat (121) close to the support column (120). A buzzer (151) is installed at one end of the machine body (122) away from the rotating seat (121). The buzzer (151) is electrically connected to the attitude sensor (150).

5. The crane for assembling the steel skeleton of a large-span steel-concrete thin-shell roof according to claim 4, characterized in that: A connecting rod (140) is installed on the lifting arm (130). A cleaning ring (141) is installed at the other end of the connecting rod (140). Brush hairs are installed in the cleaning ring (141). The steel wire rope (131) passes through the cleaning ring (141).

6. The crane for assembling the steel skeleton of a long-span steel-concrete thin-shell roof according to claim 5, characterized in that: A base (310) is installed outside the mounting ring (170). A plurality of mounting holes (320) are formed in the base (310). A ground nail (330) is installed in any one of the mounting holes (320), and the ground nail (330) is adapted to the mounting hole (320).

7. The crane for assembling the steel skeleton of a long-span steel-concrete thin-shell roof according to claim 6, characterized in that: A plurality of connecting grooves (340) are formed in the base (310). Thread grooves are formed in the connecting grooves (340). A threaded rod (350) is installed in each of the connecting grooves (340). The threaded rod (350) is matched with the thread groove. A first counterweight (360) is installed at one end of the threaded rod (350) away from the base (310). A second counterweight (380) is arranged on the top of the first counterweight (360). Clamping grooves (390) are formed on the upper surfaces of the first counterweight (360) and the second counterweight (380). Correspondingly, a clamping block (370) is installed at the bottom of the second counterweight (380). The second counterweight (380) is clamped in the clamping groove (390) on the top of the first counterweight (360) through the clamping block (370).

8. The installation method of a crane for assembling a large-span steel-concrete thin-shell roof steel skeleton according to claim 7, characterized in that: When an object needs to be lifted, the base (310) is placed on the ground, and then the ground nail (330) is nailed to the ground through the mounting hole (320) to stably fix it; Adjust the number of counterweights according to the weight of the object to be lifted. When in use, first install the first counterweight (360) into the connecting groove (340) through the threaded rod (350) at the bottom end, and then adjust the number of the second counterweights (380) according to the required weight. Install the second counterweights (380) into the clamping grooves (390) formed on the first counterweight (360) through the clamping blocks (370) at the bottom ends; Then start the motor (231). The motor (231) drives the gear (233) to rotate through the transmission shaft (232). The gear (233) drives the mounting rod (222) engaged with it to move upward. When the mounting rod (222) moves, it drives the sliding rod (220) to move upward. The sliding rod (220) drives the limiting disc (221) to move upward so that it is clamped into the second installation groove (162) at the lower end of the mounting disc (160), and the limiting disc (221) pushes the mounting disc (160) upward; When the mounting disc (160) moves upward, it synchronously drives the two fixed clamps (213) to move upward. Since the lower ends of the fixed clamps (213) are locked under the action of the round rod (214) and the semi-circular groove (212), the mounting disc (160) is locked and stops moving upward. When disassembly is required, control the motor (231) to rotate in the reverse direction; The position of the round rod (214) at the bottom end of the fixed clamp (213) in the semi-circular groove (212) can be adjusted according to the diameter of the mounting disc (160).

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