Adjustable supporting jig frame

Abstract

The utility model relates to the technical field of supporting jig frames, in particular to an adjustable supporting jig frame, which not only reduces the occupied area, facilitates the disassembly and assembly of a plurality of groups of standard parts and improves the working efficiency, but also can finely adjust the height and improves the flexibility of the device. Comprising a connecting mechanism; the device further comprises a supporting mechanism, heightening mechanisms, an adjusting mechanism and four traction mechanisms, the supporting mechanism is installed on the connecting mechanism and enhances the stability of the connecting mechanism, the heightening mechanisms are installed on the connecting mechanism and connected with the multiple heightening mechanisms according to the needed height, and the adjusting mechanism is installed at the top ends of the heightening mechanisms and conducts fine adjustment on the height. The four traction mechanisms are installed on the adjusting mechanism to enhance the stability of the adjusting mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of supporting tire frames, in particular to an adjustable supporting tire frame. Background Art

[0002] The support frame is a special process equipment, which mainly bears load and force, and is convenient for the assembly and welding of mechanical equipment. It is widely used in various projects such as formwork engineering, steel structure installation engineering, bridge engineering, etc.

[0003] The existing support frame, for example, an adjustable special-shaped steel truss temporary support frame disclosed in the utility model patent with application number 202221363278.1, has a main structure comprising: a standard frame is arranged on the top of the ground, a limiting column is arranged at the bottom of the standard frame, a plug-in connector is arranged at the bottom of the limiting column, a screw rod is screwed at the end of the plug-in connector, a limiting plate is arranged at the end of the plug-in connector, a push column is arranged at the end of the screw rod, and a limiting tube is arranged at the top of the standard frame; when in use, multiple sets of standard frames are stacked Stacked up, a support rod is set on the top of the topmost standard frame, which plays a supporting role, and the limit column and the plug connector are inserted into the limit tube. The shape of the limit tube is convenient for the plug connector to be plugged in. After the limit column enters the limit tube, it is convenient for the plug rod to be inserted into the plug hole, so that the two sets of standard frames are stabilized together, and the screw rod is screwed, and the push column pushes the limit plate, so that the limit plate is stuck in the bottom of the limit tube, and the two sets of standard frames are fixed together. After use, multiple sets of standard frames can be easily disassembled and then used next time.

[0004] However, most of the existing tire support frames require a large floor space, and the height adjustment is troublesome, and a long time is required to assemble and adjust the standard frame. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides an adjustable support tire frame which not only reduces the floor space, facilitates the disassembly and assembly of multiple groups of standard parts, and improves work efficiency, but also can fine-tune the height, thereby improving the flexibility of the device.

[0006] The utility model discloses an adjustable supporting tire frame, which comprises a connecting mechanism; a supporting mechanism, a height-increasing mechanism, an adjusting mechanism and four groups of traction mechanisms, wherein the supporting mechanism is installed on the connecting mechanism and enhances the stability of the connecting mechanism, the height-increasing mechanism is installed on the connecting mechanism and connects a plurality of groups of height-increasing mechanisms according to required heights, the adjusting mechanism is installed on the top of the height-increasing mechanism and fine-adjusts the height, and the four groups of traction mechanisms are all installed on the adjusting mechanism to enhance the stability of the adjusting mechanism; the connecting mechanism is placed at a position requiring support, a plurality of groups of height-increasing mechanisms are connected and connected to the top of the connecting mechanism according to required heights, the adjusting mechanism is installed on the top of the topmost height-increasing mechanism, and then it is erected, and the stability of the device is enhanced by using the supporting mechanism, and then the four groups of traction mechanisms are tightened to enhance the stability of the adjusting mechanism and improve the supporting effect of the tire frame on the truss.

[0007] Preferably, the connecting mechanism includes a base, four groups of ribs, a rotating shaft, a support column, a threaded connector and two groups of plug rods. The bottom end of the base is connected to the ground, a groove is provided on the base, the four groups of ribs are installed on the base, the rotating shaft is rotatably installed in the groove of the base, the support column is installed on the rotating shaft, the bottom end of the threaded connector is connected to the top end of the support column, and a positioning hole is provided on the threaded connector, and the two groups of plug rods are inserted into the base; move the base to a position where support is required, connect the height-increasing mechanism with the threaded connector, and then erect the support column and the height-increasing mechanism; when the support column is perpendicular to the ground, insert the two groups of plug rods into the base to fix the rotating shaft to prevent it from rotating; when disassembly is required, pull out the two groups of plug rods and lay the support column down for easy disassembly.

[0008] Preferably, the supporting mechanism comprises four groups of connecting seats, four groups of diagonal support shafts, four groups of fixed seats, four groups of latches, a hydraulic cylinder, a spring and a fixed plate, the bottom ends of the four groups of connecting seats are connected to the top end of the base, the four groups of diagonal support shafts are rotatably mounted on the four groups of connecting seats, the four groups of fixed seats are fixedly mounted on the threaded connecting head, the four groups of latches are respectively inserted into the four groups of fixed seats, the hydraulic cylinder is mounted in the groove of the base, the spring is mounted in the groove of the base, the fixed plate is slidably mounted in the groove of the base and connected to the top end of the hydraulic cylinder; the supporting mechanism comprises four groups of connecting seats, four groups of diagonal support shafts, four groups of fixed seats, four groups of latches, a hydraulic cylinder, a spring and a fixed plate, the bottom ends of the four groups of connecting seats are connected to the top end of the base, the four groups of diagonal support shafts are rotatably mounted on the four groups of connecting seats, the four groups of fixed seats are fixedly mounted on the threaded connecting head, the four groups of latches are respectively inserted into the four groups of fixed seats, the hydraulic cylinder is mounted in the groove of the base, the spring is mounted in the groove of the base, the fixed plate is slidably mounted in the groove of the base and connected to the top end of the hydraulic cylinder.

[0009] Preferably, the height-increasing mechanism includes an internal threaded connector, a connecting rod, a second threaded connector, a second latch, a lock, three groups of fixed columns, three groups of climbing frames and six groups of guide rods. The bottom end of the internal threaded connector is rotatably connected to the first threaded connector, and a positioning hole is provided on the internal threaded connector. The bottom end of the connecting rod is connected to the top end of the internal threaded connector, the bottom end of the second threaded connector is connected to the top end of the connecting rod, and a positioning hole is provided on the second threaded connector. The second latch is inserted into the positioning hole, and the lock is installed on the internal threaded connector. The three groups of fixed columns are fixedly installed on the connecting rod, and the three groups of climbing frames are respectively installed on the three groups of fixed columns. Two groups of guide rods are installed on each group of climbing frames, and the guide rods are connected to the connecting rods. The height-increasing mechanism includes an internal threaded connector, a connecting rod, a second threaded connector, a second latch, a lock, three groups of fixed columns, three groups of climbing frames and six groups of guide rods. The bottom end of the internal threaded connector is rotatably connected to the first threaded connector, and a positioning hole is provided on the internal threaded connector. The bottom end of the connecting rod is connected to the top end of the internal threaded connector, the bottom end of the second threaded connector is connected to the top end of the connecting rod, and a positioning hole is provided on the second threaded connector. The second latch is inserted into the positioning hole, and the lock is installed on the internal threaded connector. The three groups of fixed columns are fixedly installed on the connecting rod, and the three groups of climbing frames are respectively installed on the three groups of fixed columns. Two groups of guide rods are installed on each group of climbing frames, and the guide rods are connected to the connecting rods.

[0010] Preferably, the bottom bend of the guide rod is chamfered, while the top bend of the guide rod is not chamfered; and the bottom bend of the guide rod is chamfered, while the top bend of the guide rod is not chamfered.

[0011] Preferably, the adjusting mechanism includes a push rod, a connecting frame, a platform, a handle, four groups of cylinders and a support frame, the push rod is rotatably connected to the second threaded connecting head, the bottom end of the connecting frame is connected to the top of the push rod, the bottom end of the platform is connected to the top of the connecting frame, the handle is installed on the platform, the bottom end of the four groups of cylinders is connected to the top of the platform, and the bottom end of the support frame is connected to the top of the four groups of cylinders; the adjusting mechanism includes a push rod, a connecting frame, a platform, a handle, four groups of cylinders and a support frame, the push rod is rotatably connected to the second threaded connecting head, the bottom end of the connecting frame is connected to the top of the push rod, the bottom end of the platform is connected to the top of the connecting frame, the handle is installed on the platform, the bottom end of the four groups of cylinders is connected to the top of the platform, and the bottom end of the support frame is connected to the top of the four groups of cylinders.

[0012] Preferably, the traction mechanism includes a connecting buckle, a traction rope and a second rotating shaft, the connecting buckle is installed on the rib plate, the traction rope passes through the connecting buckle, the second rotating shaft is rotatably installed on the platform and fixed to one end of the traction rope; the traction mechanism includes a connecting buckle, a traction rope and a second rotating shaft, the connecting buckle is installed on the rib plate, the traction rope passes through the connecting buckle, the second rotating shaft is rotatably installed on the platform and fixed to one end of the traction rope.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: placing the connecting mechanism at a position requiring support, connecting multiple groups of height-increasing mechanisms according to required heights and connecting them to the top of the connecting mechanism, installing the adjusting mechanism at the top of the topmost height-increasing mechanism, and then erecting it, and utilizing the supporting mechanism to enhance the stability of the device, and then tightening the four groups of traction mechanisms to enhance the stability of the adjusting mechanism and improve the supporting effect of the tire frame on the truss. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the axonometric structure of the utility model;

[0015] Figure 2 It is a partially enlarged isometric structural diagram of the connecting mechanism and the traction mechanism of the utility model;

[0016] Figure 3 It is a partially enlarged cross-sectional axonometric structural schematic diagram of the connection mechanism and the support mechanism of the utility model;

[0017] Figure 4 It is a partially enlarged axonometric structural schematic diagram of the height-increasing mechanism of the utility model;

[0018] Figure 5 It is a partially enlarged axonometric structural schematic diagram of the regulating mechanism and the traction mechanism of the utility model.

[0019] Markings in the attached drawings: 01, connecting mechanism; 11, base; 12, rib plate; 13, rotating shaft 1; 14, supporting column; 15, threaded connector 1; 16, plug rod; 02, supporting mechanism; 21, connecting seat; 22, diagonal support shaft; 23, fixing seat; 24, latch 1; 25, hydraulic cylinder; 26, spring; 27, fixing plate; 03, raising mechanism; 31, internal threaded connector; 32, connecting rod; 33, threaded connector 2; 34, latch 2; 35, lock; 36, fixing column; 37, climbing frame; 38, guide rod; 04, adjusting mechanism; 41, push rod; 42, connecting frame; 43, platform; 44, handle; 45, cylinder; 46, supporting frame; 05, traction mechanism; 51, connecting buckle; 52, traction rope; 53, rotating shaft 2. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0021] Example 1

[0022] The utility model discloses an adjustable support tire frame, comprising a connecting mechanism 01; a supporting mechanism 02, a height-increasing mechanism 03, an adjusting mechanism 04 and four groups of traction mechanisms 05, wherein the supporting mechanism 02 is mounted on the connecting mechanism 01 and enhances the stability of the connecting mechanism 01, the height-increasing mechanism 03 is mounted on the connecting mechanism 01 and multiple groups of height-increasing mechanisms 03 are connected according to the required height, the adjusting mechanism 04 is mounted on the top of the height-increasing mechanism 03 and fine-tunes the height, and the four groups of traction mechanisms 05 are all mounted on the adjusting mechanism 04 to enhance the stability of the adjusting mechanism 04; the connecting mechanism 01 comprises a base 11, four groups of ribs 12, a rotating shaft 13, a supporting column 14, a threaded connector 1 5 and two groups of plug rods 16, the bottom end of the base 11 is connected to the ground, the base 11 is provided with a groove, four groups of ribs 12 are all installed on the base 11, the rotating shaft 13 is rotatably installed in the groove of the base 11, the support column 14 is installed on the rotating shaft 13, the bottom end of the threaded connector 15 is connected to the top of the support column 14, and the threaded connector 15 is provided with a positioning hole, and the two groups of plug rods 16 are inserted into the base 11; the supporting mechanism 02 includes four groups of connecting seats 21, four groups of diagonal support shafts 22, four groups of fixed seats 23, four groups of latches 24, hydraulic cylinders 25, springs 26 and fixed plates 27, the bottom ends of the four groups of connecting seats 21 are all connected to the top of the base 11, the four groups of diagonal support shafts The four sets of fixing seats 22 are respectively rotatably mounted on the four connecting seats 21, the four sets of fixing seats 23 are all fixedly mounted on the threaded connector 15, the four sets of latches 24 are respectively inserted into the four sets of fixing seats 23, the hydraulic cylinder 25 is installed in the groove of the base 11, the spring 26 is installed in the groove of the base 11, the fixing plate 27 is slidably installed in the groove of the base 11 and connected to the top of the hydraulic cylinder 25; the height increasing mechanism 03 includes an internal threaded connector 31, a connecting rod 32, a threaded connector 33, a latch 34, a lock 35, three sets of fixing columns 36, three sets of climbing frames 37 and six sets of guide rods 38, the bottom end of the internal threaded connector 31 is rotatably connected to the threaded connector 15, and the internal threaded connector 31 is rotatably connected to the threaded connector 15, and the internal threaded connector 31 is rotatably connected to the threaded connector 15. A positioning hole is formed on the threaded connector 31, the bottom end of the connecting rod 32 is connected to the top end of the internal threaded connector 31, the bottom end of the second threaded connector 33 is connected to the top end of the connecting rod 32, and a positioning hole is formed on the second threaded connector 33, the second latch 34 is inserted into the positioning hole, the lock buckle 35 is installed on the internal threaded connector 31, three groups of fixed columns 36 are fixedly installed on the connecting rod 32, three groups of climbing frames 37 are respectively installed on the three groups of fixed columns 36, two groups of guide rods 38 are installed on each group of climbing frames 37, and the guide rods 38 are connected to the connecting rod 32; the bottom end of the guide rod 38 is chamfered, while the top end of the guide rod 38 is not chamfered;The adjusting mechanism 04 includes a push rod 41, a connecting frame 42, a platform 43, a handle 44, four groups of cylinders 45 and a support frame 46. The push rod 41 is rotatably connected to the threaded connector 33, the bottom end of the connecting frame 42 is connected to the top of the push rod 41, the bottom end of the platform 43 is connected to the top of the connecting frame 42, the handle 44 is installed on the platform 43, the bottom end of the four groups of cylinders 45 is connected to the top of the platform 43, and the bottom end of the support frame 46 is connected to the top of the four groups of cylinders 45. When it is working, first, move the base 11 to the position where support is required. When only one set of height-increasing mechanism 03 is installed, move the internal threaded connector 31 to The threaded connector 15 is rotated to connect and align the positioning holes, then the lock buckle 35 is opened, the second latch 34 is inserted into the positioning hole, and the lock buckle 35 is closed to lock the second latch 34, and then the threaded connector 23 is connected to the adjustment mechanism 04, and is also fixed by the second latch 34 and the lock buckle 35. When it is necessary to install multiple groups of height-increasing mechanisms 03, the threaded connector 23 is connected to the internal threaded connector 31 of the second group, and is fixed by the second latch 34 and the lock buckle 35, which simplifies the installation and disassembly steps, saves the application of a large number of bolts and nuts, and improves work efficiency. Then the hydraulic cylinder 25 is started, and the hydraulic cylinder 25 pushes The fixing plate 27 is moved, and the fixing plate 27 pushes the threaded connector 15 to rotate, which assists in erecting the support column 14 and prevents the support column 14 from falling. When the support column 14 is vertical to the ground, the two groups of plug rods 16 are inserted into the base 11 to fix the rotating shaft 13 to prevent it from rotating. Then, the four groups of diagonal support shafts 22 are connected to the four groups of fixed seats 23, and the four groups of latches 1 24 are inserted into the four groups of fixed seats 23, so that the four groups of diagonal support shafts 22 support the support column 14 to enhance the stability of the device. The top rod 41 is rotatably connected to the threaded connector 2 33 and fixed by the latch 2 34 and the lock 35. By setting the platform 43 increases the support area of ​​the device. The staff can remotely control the telescopic height of the four sets of cylinders 45 from below. While fine-tuning the support height, the four sets of cylinders 45 can also be extended to different heights, so that the support frame 46 supports the inclined surface. When maintenance is required, the staff puts the safety belt on the connecting rod 32. Through the chamfering of the guide rod 38, when the staff climbs up, the safety belt can naturally follow the guide rod 38. When the staff falls, the safety belt is tightened and put on the two sets of guide rods 38 under the action of gravity to prevent the staff from falling. After climbing to the top, hold the handle 44 to maintain stability. ;

[0023] Example 2

[0024] like Figures 1 to 5As shown, an adjustable support tire frame of the utility model is based on Example 1; the traction mechanism 05 includes a connecting buckle 51, a traction rope 52 and a second rotating shaft 53, the connecting buckle 51 is installed on the rib plate 12, the traction rope 52 passes through the connecting buckle 51, and the second rotating shaft 53 is rotatably installed on the platform 43 and fixed to one end of the traction rope 52; when it is working, first, the base 11 is moved to the position where support is required. When only one set of height-increasing mechanisms 03 is installed, the internal threaded connector 31 is rotatably connected with the threaded connector 15 and the positioning holes are aligned, then the lock buckle 35 is opened, the second latch 34 is inserted into the positioning hole, and then the lock buckle 35 is closed to lock the second latch 34, and then the threaded connector 2 33 It is connected to the adjustment mechanism 04 and is also fixed by the second latch 34 and the lock buckle 35. When it is necessary to install multiple groups of height-increasing mechanisms 03, the second threaded connector 33 is connected to the internal threaded connector 31 of the second group and fixed by the second latch 34 and the lock buckle 35, which simplifies the installation and disassembly steps, saves the application of a large number of bolts and nuts, and improves work efficiency. The push rod 41 is rotatably connected to the second threaded connector 33 and fixed by the second latch 34 and the lock buckle 35, and then the hydraulic cylinder 25 is started. The hydraulic cylinder 25 pushes the fixing plate 27, and the fixing plate 27 pushes the threaded connector 15 to rotate, which assists in erecting the support column 14 and preventing the support column 14 from tipping over. At the same time, one end of the traction rope 52 is fixedly connected to the rotating shaft 2 53 Then, the other end of the traction rope 52 is connected to the winch, the corresponding winch is started, and the traction rope 52 is pulled to drive the rotating shaft 2 53 and the platform 43, so as to facilitate the lifting of the height-increasing mechanism 03. When the support column 14 is vertical to the ground, the two sets of plug rods 16 are inserted into the base 11 to fix the rotating shaft 13 to prevent it from rotating. Then, the four sets of diagonal support shafts 22 are connected to the four sets of fixed seats 23, and the four sets of latches 1 24 are inserted into the four sets of fixed seats 23, so that the four sets of diagonal support shafts 22 support the support column 14 to enhance the stability of the device. The top rod 41 is rotatably connected to the threaded connector 2 33 and fixed by the latch 2 34 and the lock buckle 35. After the height-increasing mechanism 03 is vertical, the traction rope 52 is passed through the rib plate 12 and tied tightly. The platform 43 is towed and fixed by setting four groups of traction mechanisms 05. The supporting area of ​​the device is enhanced by setting the platform 43. The staff can remotely control the telescopic height of the four groups of cylinders 45 from below. While fine-tuning the supporting height, the four groups of cylinders 45 can also be extended to different heights, so that the support frame 46 supports the inclined surface. When maintenance is required, the staff will put the safety belt on the connecting rod 32. Through the chamfering treatment of the guide rod 38, when the staff climbs up, the safety belt can naturally follow the rise through the guide rod 38. When the staff falls, the safety belt is tightened and put on the two groups of guide rods 38 under the action of gravity to prevent the staff from falling. After climbing to the top, hold the handle 44 to maintain stability.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An adjustable tire support frame, comprising a connecting mechanism (01); characterized in that: The invention also comprises a supporting mechanism (02), a height-increasing mechanism (03), an adjusting mechanism (04) and four groups of traction mechanisms (05); the supporting mechanism (02) is mounted on the connecting mechanism (01) and enhances the stability of the connecting mechanism (01); the height-increasing mechanism (03) is mounted on the connecting mechanism (01) and connects a plurality of groups of height-increasing mechanisms (03) according to the required height; the adjusting mechanism (04) is mounted on the top of the height-increasing mechanism (03) and performs fine adjustment on the height; and the four groups of traction mechanisms (05) are all mounted on the adjusting mechanism (04) to enhance the stability of the adjusting mechanism (04).

2. An adjustable tire support frame as claimed in claim 1, characterized in that: The connection mechanism (01) comprises a base (11), four groups of ribs (12), a rotating shaft (13), a support column (14), a threaded connector (15) and two groups of insertion rods (16). The bottom end of the base (11) is connected to the ground, a groove is formed on the base (11), the four groups of ribs (12) are all mounted on the base (11), the rotating shaft (13) is rotatably mounted in the groove of the base (11), the support column (14) is mounted on the rotating shaft (13), the bottom end of the threaded connector (15) is connected to the top end of the support column (14), and a positioning hole is formed on the threaded connector (15), and the two groups of insertion rods (16) are inserted on the base (11).

3. An adjustable tire support frame as claimed in claim 2, characterized in that: The supporting mechanism (02) comprises four groups of connecting seats (21), four groups of diagonal support shafts (22), four groups of fixed seats (23), four groups of latches (24), a hydraulic cylinder (25), a spring (26) and a fixing plate (27). The bottom ends of the four groups of connecting seats (21) are connected to the top end of the base (11). The four groups of diagonal support shafts (22) are rotatably mounted on the four groups of connecting seats (21). The four groups of fixed seats (23) are fixedly mounted on the threaded connector (15). The four groups of latches (24) are respectively inserted into the four groups of fixed seats (23). The hydraulic cylinder (25) is mounted in a groove of the base (11). The spring (26) is mounted in a groove of the base (11). The fixing plate (27) is slidably mounted in the groove of the base (11) and connected to the top end of the hydraulic cylinder (25).

4. The adjustable tire support frame according to claim 2, characterized in that: The height-increasing mechanism (03) comprises an internal threaded connector (31), a connecting rod (32), a second threaded connector (33), a second latch (34), a lock (35), three groups of fixing columns (36), three groups of climbing frames (37) and six groups of guide rods (38). The bottom end of the internal threaded connector (31) is rotatably connected to the first threaded connector (15), and a positioning hole is formed on the internal threaded connector (31). The bottom end of the connecting rod (32) is connected to the top end of the internal threaded connector (31). The second threaded connector (34) is connected to the first threaded connector (15). The bottom end of the connecting rod (33) is connected to the top end of the connecting rod (32), and a positioning hole is opened on the second threaded connector (33), the second latch (34) is inserted into the positioning hole, the lock buckle (35) is installed on the internal threaded connector (31), the three groups of fixed columns (36) are fixedly installed on the connecting rod (32), the three groups of climbing frames (37) are respectively installed on the three groups of fixed columns (36), and each group of climbing frames (37) is installed with two groups of guide rods (38) and the guide rods (38) are connected to the connecting rod (32).

5. An adjustable tire support frame as claimed in claim 4, characterized in that: The bottom bending part of the guide rod (38) is chamfered, while the top bending part of the guide rod (38) is not chamfered.

6. The adjustable tire support frame according to claim 4, characterized in that: The adjusting mechanism (04) comprises a push rod (41), a connecting frame (42), a platform (43), a handle (44), four groups of cylinders (45) and a support frame (46); the push rod (41) is rotatably connected to the second threaded connector (33); the bottom end of the connecting frame (42) is connected to the top end of the push rod (41); the bottom end of the platform (43) is connected to the top end of the connecting frame (42); the handle (44) is installed on the platform (43); the bottom end of the four groups of cylinders (45) is connected to the top end of the platform (43); and the bottom end of the support frame (46) is connected to the top end of the four groups of cylinders (45).

7. An adjustable tire support frame as claimed in claim 6, characterized in that: The traction mechanism (05) comprises a connecting buckle (51), a traction rope (52) and a second rotating shaft (53). The connecting buckle (51) is mounted on the rib plate (12), the traction rope (52) passes through the connecting buckle (51), and the second rotating shaft (53) is rotatably mounted on the platform (43) and fixed to one end of the traction rope (52).

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