Road and bridge construction approach slab structure

Abstract

A road and bridge construction approach slab structure comprises a water tank, a fixed bottom plate, a position control sleeve shell, a gear disc, a fixed supporting leg, a movable supporting sleeve and an approach slab, the two sides of the approach slab are connected with protective plates, the approach slab is connected with the upper end of a fixed vertical rod, the middle of the fixed vertical rod is connected with a reinforcing frame, the lower end of the fixed vertical rod is connected with the fixed bottom plate, the fixed bottom plate is connected with the water tank, and the two sides of the water tank are provided with visual ports. The upper portion of the water tank is provided with a filling pipe, the filling pipe is connected with an upper cover cap through threads, the lower portion of the water tank is provided with a discharging pipe, the discharging pipe is connected with a side cover cap through threads, the upper portion of the fixing bottom plate is provided with a fastening supporting sleeve, the fastening supporting sleeve is connected with a position control sleeve shell, and the lower portion of the position control sleeve shell is provided with a butt joint inserting sleeve which is provided with a butt joint inserting groove. And the butt joint plug bushes are matched with the butt joint slots and are connected with the butt joint slots.

Description

Technical Field

[0001] The utility model relates to the field of road and bridge construction, in particular to a road and bridge construction slab structure. Background Art

[0002] The existing patent (Announcement No.: CN211947983U) proposes a road and bridge construction plank structure, including column 1, column 2, column 3 and column 4, wherein a base is provided below the column 1, column 2, column 3 and column 4, a support plate is sleeved on the boss 1, a pin hole is provided on the boss 1, the pin hole is located above the support plate, a pin is inserted in the pin hole, a pair of symmetrically arranged protrusions are provided on both sides of the bottom of the support plate, a slot is provided on the support plate to penetrate the support plate and the protrusion, a guard plate is inserted in the slot, a notch is provided on the side of the support plate close to the arc rod, and a cover plate is hinged in the notch. However, in this device, "a base is provided below the column 1, column 2, column 3 and column 4, and a rubber anti-skid pad is provided below the base", which only relies on the rubber anti-skid pad to increase the placement and positioning of the base, and cannot ensure the stability of the center of gravity. The plank is prone to shaking when used, which affects the stability of road and bridge construction and poses a safety hazard. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides a road and bridge construction plank structure which has a stable center of gravity, strong grip and force-bearing capacity, improves the stability and safety of the road and bridge construction plank, is convenient to transfer and transport, can quickly test and level the balance of the fixed base plate, and can adjust the support height between the four groups of fixed legs and the fixed base plate according to the actual construction environment of the road and bridge, so as to quickly adjust and level the uneven supporting road surface, keep the fixed base plate in a balanced state, and avoid shaking of the plank.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A plank structure for road and bridge construction comprises a water tank, a fixed base plate, a position control shell, a gear plate, a fixed support leg, a movable support sleeve and a plank, wherein both sides of the plank are connected with protective plates, the plank is connected with the upper end of a fixed upright pole, the middle of the fixed upright pole is connected with a reinforcement frame, the lower end of the fixed upright pole is connected with a fixed base plate, the fixed base plate is connected with a water tank, visual ports are arranged on both sides of the water tank, water level lines are arranged outside the visual ports, a filling pipe is arranged on the upper part of the water tank, the filling pipe is connected with an upper cover cap by a thread, a discharge pipe is arranged on the lower part of the water tank, the discharge pipe is connected with a side cover cap by a thread, a fastening support sleeve is arranged on the upper part of the fixed base plate, the fastening support sleeve is connected with the position control shell, the lower part of the position control shell is provided with a docking sleeve, the fastening support sleeve has a docking slot, the docking sleeve is adapted to the docking slot, and the docking sleeve is connected to the docking slot.

[0006] The utility model discloses a fastening support sleeve externally connected to a fastening buckle, an inner side of the fastening buckle is provided with a fastening card plate, both sides of the fastening support sleeve are provided with card plate through holes, a docking sleeve is provided with a fastening card slot, the fastening card slot and the card plate through holes are adapted to the fastening card plate, the fastening card plate passes through the card plate through holes, the fastening card plate is connected to the fastening card slot, a positioning support rod is provided on the upper part of the fixed support leg, the positioning support rod passes through the fixed bottom plate, the fastening support sleeve and the position control sleeve shell in sequence, the positioning support rod is connected to the position control sleeve shell through threads, and a rotating wheel is provided on the outside of the position control sleeve shell.

[0007] The utility model describes that the lower part of the fixed leg is provided with a support plate, the upper part of the support plate is connected to the limiting vertical rod, the fixed bottom plate has a vertical rod through hole, the limiting vertical rod is adapted to the vertical rod through hole, the limiting vertical rod passes through the vertical rod through hole, the middle part of the fixed leg is provided with a strip through hole, the strip through hole is adapted to the gear plate, the gear plate passes through the strip through hole, the gear plate fits the fixed leg, the fixed leg is connected to the motor, the motor is connected to the driving shaft, the driving shaft passes through the fixed leg, and the driving shaft is connected to the gear plate.

[0008] Beneficial effects:

[0009] 1. The utility model has a water tank on the upper part of the fixed bottom plate. Water is filled into the water tank through a filling pipe to increase the weight of the bottom of the device, ensure the stability of the center of gravity of the scaffolding, avoid the scaffolding from shaking, and improve the stability and safety of road and bridge construction. After the construction is completed, the water in the water tank is drained through a discharge pipe to reduce the overall weight of the device and increase the convenience of device transfer and handling. The visual ports on both sides of the water tank are convenient for quick observation of the water volume in the water tank, and the balance of the fixed bottom plate can be quickly tested and leveled through the water level lines on both sides to ensure the stability of its upward supporting force.

[0010] 2. The position-controlling sleeve of the utility model is connected to the positioning support rod through a thread, so that when the position-controlling sleeve is driven to rotate by rotating the rotating wheel, the positioning support rod will perform a longitudinal linear displacement, thereby adjusting the support distance between the support plate and the fixed bottom plate, so that it can adjust the support height between the support plate and the fixed bottom plate by lifting and lowering four groups of fixed legs respectively according to the actual construction environment of the road and bridge, so as to quickly adjust and level the uneven supporting road surface, keep the fixed bottom plate in a balanced state, and avoid the shaking of the board. The limit vertical rod provided on the upper part of the support plate increases the connection fulcrum between the support plate and the fixed bottom plate, and limits the position of the fixed legs, so that they maintain a longitudinal linear lifting displacement, avoid being affected by the driving force of the position-controlling sleeve and following the rotation, and improve the structural stability.

[0011] 3. The movable support sleeves on both sides of the utility model are buckled and fixed to the outside of the fixed support legs, and the racks on the inner sides thereof are meshed and connected with the gear plate, so that when the motor drives the gear plate to rotate through the driving shaft, the racks push the movable support sleeves to perform longitudinal linear lifting and lowering displacement outside the fixed support legs. When the movable support sleeves descend to the point where the lower surface of the movable pressure plate fits with the upper surface of the support plate, multiple sets of positioning cone rods are inserted into the soil through the cone rod perforations, thereby increasing the grip strength of the bottom of the support plate, improving its upward support and fixed positioning, enhancing the overall wind resistance and force bearing capacity of the device, and improving the stability and safety of road and bridge construction. When the movable support sleeves rise to the tip of the positioning cone rod and are stored in the support plate, the grip fulcrum at the bottom of the support plate disappears, which facilitates its movement and transfer, and avoids the tip of the positioning cone rod from being exposed and scratching the transporters, thereby increasing the safety of construction operations.

[0012] 4. When the fixed base plate of the utility model is erected, the height of the fixed legs is first adjusted by rotating the rotating wheel, and a small amount of water is added into the water tank to test and level the balance state of the fixed base plate. When the four corners of the fixed base plate are balanced, the water tank is filled with water to increase the weight of the bottom of the device to improve the stability of the center of gravity. Then, the movable support sleeve is driven by a motor to move to the lower end of the positioning cone rod and inserted into the soil to strengthen the gripping fulcrum at the bottom of the support plate, thereby improving the positioning and force-bearing capacity of the device. When the device is dismantled, the movable support sleeve is driven in reverse by the motor to move to the tip of the positioning cone rod and stored in the support plate, and then the water in the water tank is drained through the discharge pipe, so that the overall weight of the device is reduced, the convenience of transferring and carrying the device is increased, and the operation is convenient.

[0013] 5. The fastening buckles on both sides of the utility model are fastened and fixed to the outside of the fastening support sleeve, and the fastening clamping plate on the inner side thereof increases the connection fulcrum between the fastening support sleeve and the docking sleeve, and limits the position of the control sleeve shell to keep its longitudinal height unchanged, and perform axial rotation adjustment to prevent it from moving and disengaging, affecting the linkage effect between the components, and improving the structural stability.

[0014] 6. The utility model has a stable center of gravity, strong grip and force-bearing capacity, which improves the stability and safety of the road and bridge construction planks. It is convenient to transfer and transport, and can quickly test and level the balance of the fixed base plate. According to the actual construction environment of the road and bridge, the four sets of fixed legs can be raised and lowered respectively, and the support height between them and the fixed base plate can be adjusted to quickly adjust and level the uneven supporting road surface, so as to keep the fixed base plate in a balanced state and avoid shaking of the plank. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a schematic diagram of a road bridge construction plank structure.

[0016] Figure 2 This is a cross-sectional view of the fixed base plate support structure described in the utility model.

[0017] Figure 3 This is a cross-sectional view of the connection structure of the fixed support leg and the movable support sleeve described in the utility model.

[0018] Figure 4 It is a cross-sectional view of the connection structure of the positioning support rod, the docking sleeve, the fastening support sleeve and the fastening buckle ring described in the utility model.

[0019] Figure 5 It is a schematic diagram of the movable support sleeve structure described in the utility model.

[0020] Figure 6 This is a schematic diagram of the fixed leg structure described in the utility model.

[0021] Figure 7 This is an exploded view of the fixed leg driving structure described in the utility model.

[0022] Figure 8 For the utility model Figure 2 A magnified view of the local structure. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below according to the accompanying drawings and embodiments:

[0024] Embodiment 1:

[0025] A road bridge construction plank structure includes a water tank 01, a fixed bottom plate 07, a position control housing 11, a gear plate 20, a fixed leg 26, a movable support sleeve 28, and a plank 32. The plank 32 is connected to protective plates 33 on both sides. The plank 32 is connected to the upper end of a fixed upright pole 31. The middle of the fixed upright pole 31 is connected to a reinforcement frame 34. The lower end of the fixed upright pole 31 is connected to the fixed bottom plate 07. The fixed bottom plate 07 is connected to the water tank 01. Visual ports 06 are provided on both sides of the water tank 01. A water level line 35 is provided outside the visual port 06. A filling pipe 02 is provided on the upper part of the water tank 01. The filling pipe 02 is connected to the upper cap 04 through a thread. The lower part of the water tank 01 is provided with a discharge pipe 03, which is connected to the side cover cap 05 through a thread. The upper part of the fixed bottom plate 07 is provided with a water tank 01. Water is poured into the water tank 01 through the filling pipe 02 to increase the weight of the bottom of the device, ensure the stability of the center of gravity of the scaffolding 32, avoid the scaffolding 32 from shaking, and improve the stability and safety of road and bridge construction. After the construction is completed, the water in the water tank 01 is emptied through the discharge pipe 03 to reduce the overall weight of the device and increase the convenience of the device transfer and handling. The viewing ports on both sides of the water tank 01 are provided. 06 is convenient for quickly observing the water volume in the water tank 01, and the balance of the fixed bottom plate 07 can be quickly tested and leveled through the water level lines 35 on both sides to ensure the stability of its upward supporting force. The upper part of the fixed bottom plate 07 has a fastening support sleeve 13, the fastening support sleeve 13 is connected to the position control sleeve shell 11, and the lower part of the position control sleeve shell 11 has a docking sleeve 14. The fastening support sleeve 13 has a docking slot 15, and the docking sleeve 14 is adapted to the docking slot 15, and the docking sleeve 14 is connected to the docking slot 15.

[0026] Embodiment 2:

[0027] The utility model discloses a fastening support sleeve 13 externally connected to a fastening buckle 16, the fastening buckle 16 has a fastening card plate 17 on the inner side, the fastening support sleeve 13 has card plate through holes 19 on both sides, the docking sleeve 14 has a fastening card slot 18, the fastening card slot 18 and the card plate through holes 19 are adapted to the fastening card plate 17, the fastening card plate 17 passes through the card plate through holes 19, the fastening card plate 17 is connected to the fastening card slot 18, the fastening buckles 16 on both sides are oppositely buckled and fixed to the outside of the fastening support sleeve 13, The fastening card plate 17 on the inner side increases the connection fulcrum between the fastening support sleeve 13 and the docking sleeve 14, and limits the position of the control sleeve shell 11 to keep its longitudinal height unchanged and perform axial rotation adjustment to avoid its movement and separation, which affects the linkage effect between the components and improves the structural stability. The upper part of the fixed support leg 26 has a positioning support rod 10, which passes through the fixed bottom plate 07, the fastening support sleeve 13, and the control sleeve shell 11 in sequence. The support rod 10 is connected to the control sleeve 11 by a thread, and the control sleeve 11 has a rotating wheel 12 on the outside. The control sleeve 11 is positioned and connected to the positioning support rod 10 by a thread, so that when the control sleeve 11 is driven to rotate by rotating the rotating wheel 12, the positioning support rod 10 will perform a longitudinal linear displacement accordingly, so as to adjust the support distance between the support plate 25 and the fixed base plate 07, so that it can adjust the support height between the support plate 25 and the fixed base plate 07 according to the actual construction environment of the road and bridge by lifting and lowering four groups of fixed legs 26 respectively, so as to quickly adjust and level the uneven supporting road surface, so that the fixed base plate 07 maintains a balanced state and avoids the shaking of the bridging board 32. The limiting vertical rod 08 provided on the upper part of the support plate 25 increases the connection fulcrum between the support plate 25 and the fixed base plate 07, and limits the position of the fixed legs 26, so that it maintains a longitudinal linear lifting displacement, avoids it being affected by the driving force of the control sleeve 11 and following the rotation, thereby improving the structural stability.

[0028] Embodiment 3:

[0029] The utility model provides a fixed leg 26 with a support plate 25 at the bottom, the support plate 25 is connected to the limit rod 08 at the top, the fixed base plate 07 has a rod through hole 09, the limit rod 08 is adapted to the rod through hole 09, the limit rod 08 passes through the rod through hole 09, the fixed leg 26 has a strip through hole 24 in the middle, the strip through hole 24 is adapted to the gear plate 20, the gear plate 20 passes through the strip through hole 24, the gear plate 20 fits the fixed leg 26, the fixed leg 26 is connected to the motor 23, the motor 23 is connected to the drive shaft 22, the drive shaft 22 passes through the fixed leg 26, the drive shaft 22 is connected to the gear plate 20, when the fixed base plate 07 is erected, the fixed leg 26 is first supported by rotating the rotating wheel 12 The height is adjusted, and a small amount of water is added into the water tank 01 to test and level the balance state of the fixed bottom plate 07. When the four corners of the fixed bottom plate 07 are balanced, the water tank 01 is filled with water to increase the weight of the bottom of the device to improve the stability of the center of gravity. Then, the motor 23 drives the movable support sleeve 28 to move to the lower end of the positioning cone rod 29 and insert it into the soil to reinforce the gripping fulcrum at the bottom of the support plate 25, thereby improving the positioning and force-bearing capacity of the device. When the device is dismantled, the motor 23 is used to reversely drive the movable support sleeve 28 to move to the tip of the positioning cone rod 29 and store it in the support plate 25. Then, the water in the water tank 01 is drained through the discharge pipe 03, so that the overall weight of the device is reduced, the convenience of transferring and carrying the device is increased, and the operation is convenient.

[0030] Embodiment 4:

[0031] The fixed leg 26 of the utility model is externally connected to the movable support sleeve 28, and the lower part of the movable support sleeve 28 is provided with a movable pressure plate 27, and the movable pressure plate 27 is fitted with the support plate 25, and the support plate 25 has a plurality of cone rod through holes 30, and the positioning cone rod 29 is adapted to the cone rod through holes 30, and the cone rod through holes 30 pass through the positioning cone rod 29, and the cone rod through holes 30 are connected to the movable pressure plate 27, and the movable support sleeves 28 on both sides are buckled and fixed to the outside of the fixed leg 26, and the rack 21 on the inner side thereof is meshed and connected with the gear plate 20, so that when the motor 23 drives the gear plate 20 to rotate through the driving shaft 22, the rack 21 pushes the movable support sleeve 28 to perform a longitudinal linear lifting position outside the fixed leg 26. When the movable support sleeve 28 is moved, when the lower surface of the movable pressure plate 27 is in contact with the upper surface of the support plate 25, multiple groups of positioning cone rods 29 pass through the cone rod through holes 30 and are inserted into the soil, thereby increasing the grip strength of the bottom of the support plate 25, improving its upward support and fixed positioning, enhancing the overall wind resistance and force bearing capacity of the device, and improving the stability and safety of road and bridge construction. When the movable support sleeve 28 rises to the tip of the positioning cone rod 29 and is stored in the support plate 25, the grip fulcrum at the bottom of the support plate 25 disappears, which facilitates its movement and transfer, and avoids the tip of the positioning cone rod 29 being exposed and scratching the transporters, thereby increasing the safety of construction operations.

[0032] Embodiment 5:

[0033] The fixed support leg 26 of the utility model is divided into an outer movable support sleeve 281 and an inner movable support sleeve 282. The outer movable support sleeve 281 is connected to the inner movable support sleeve 282. The inner side of the inner movable support sleeve 282 has a slide groove 36. The slide groove 36 is adapted to the gear plate 20. The gear plate 20 is connected to the slide groove 36. The inner side of the outer movable support sleeve 281 has a rack 21. The rack 21 meshes with the gear plate 20. The gear plate 20 is connected to the rack 21. This device has a stable center of gravity, strong grip and force resistance, improves the stability and safety of the road and bridge construction planking, and is convenient to transfer and transport. At the same time, the balance degree of the fixed base plate 07 can be quickly tested and leveled. According to the actual construction environment of the road and bridge, the four groups of fixed support legs 26 can be raised and lowered respectively to adjust the support height between them and the fixed base plate 07, so as to quickly adjust and level the uneven supporting road surface, so that the fixed base plate 07 can be kept in a balanced state and the planking 32 can be prevented from shaking.

[0034] Embodiment 6:

[0035] Installation steps: first assemble the support structure of the fixed base plate 07, first pass the gear plate 20 through the strip through-hole 24 and place it into the fixed leg 26, then pass the driving shaft 22 through the fixed leg 26, and the inner end of the driving shaft 22 is fixedly connected to the gear plate 20, then install and fix the motor 23 to the outside of the fixed leg 26, and the motor 23 is drivingly connected to the driving shaft 22, then place the movable support sleeve 28 outside the fixed leg 26, and the movable support sleeves 28 on both sides are oppositely buckled and fixedly connected, the gear plate 20 is embedded in the slide groove 36, and meshed with the rack 21, then push the movable support sleeve 28 upward, and pass the positioning cone rod 29 from bottom to top through the cone rod through-hole 30, and the upper end of the positioning cone rod 29 is welded and fixedly connected to the movable pressure plate 27, Then place the control sleeve 11 on the upper part of the fastening support sleeve 13, and the docking sleeve 14 is embedded in the docking slot 15, the card plate through hole 19 corresponds to the position of the fastening card slot 18, and then place the fastening buckle 16 on the outside of the fastening support sleeve 13, and the fastening buckles 16 on both sides are oppositely buckled and fixedly connected, the fastening card plate 17 passes through the card plate through hole 19 and is embedded in the fastening card slot 18, and finally the support plate 25 is placed on the lower part of the fixed bottom plate 07, and the limiting vertical rod 08 passes through the vertical rod through hole 09, and the positioning support rod 10 passes through the fixed bottom plate in sequence. Plate 07, fastening support sleeve 13, control position sleeve shell 11, positioning support rod 10 is positioned and connected with the control position sleeve shell 11 through threads, after completing the assembly of the fixed base plate 07 support structure, the water tank 01 is installed and fixed on the upper part of the fixed base plate 07, and then the reinforcement frame 34 is welded and fixed to the middle part of the fixed vertical pole 31, and then the fixed vertical pole 31 is welded and fixed to the upper part of the fixed base plate 07, and then the strap 32 is installed and fixed to the upper part of the fixed vertical pole 31, and finally the protective plate 33 is welded and fixed to both sides of the protective plate 33 to complete the installation.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A road and bridge construction slab structure, characterized by : comprising a water tank (01), a fixed bottom plate (07), a position control housing (11), a gear plate (20), a fixed support leg (26), a movable support sleeve (28), and a slat (32), wherein both sides of the slat (32) are connected to a protective plate (33), the slat (32) is connected to the upper end of a fixed upright pole (31), the middle of the fixed upright pole (31) is connected to a reinforcement frame (34), the lower end of the fixed upright pole (31) is connected to the fixed bottom plate (07), the fixed bottom plate (07) is connected to the water tank (01), both sides of the water tank (01) are provided with a viewing port (06), the outside of the viewing port (06) is provided with a water level line (35), the water tank The upper part of the water tank (01) has a filling pipe (02), the filling pipe (02) is connected to the upper cover cap (04) through a thread, the lower part of the water tank (01) has a discharge pipe (03), the discharge pipe (03) is connected to the side cover cap (05) through a thread, the upper part of the fixed bottom plate (07) has a fastening sleeve (13), the fastening sleeve (13) is connected to the position control sleeve shell (11), the lower part of the position control sleeve shell (11) has a docking sleeve (14), the fastening sleeve (13) has a docking slot (15), the docking sleeve (14) is compatible with the docking slot (15), and the docking sleeve (14) is connected to the docking slot (15).

2. A road and bridge construction slab structure according to claim 1, characterized in that The fastening support sleeve (13) is externally connected to a fastening buckle (16), the fastening buckle (16) is provided with a fastening card plate (17) on the inner side, the fastening support sleeve (13) is provided with card plate through holes (19) on both sides, the docking sleeve (14) is provided with a fastening card slot (18), the fastening card slot (18) and the card plate through hole (19) are adapted to the fastening card plate (17), the fastening card plate (17) passes through the card plate through hole (19), the fastening card plate (17) is connected to the fastening card slot (18), the upper part of the fixed support leg (26) is provided with a positioning support rod (10), the positioning support rod (10) passes through the fixed bottom plate (07), the fastening support sleeve (13), and the position control sleeve (11) in sequence, the positioning support rod (10) is connected to the position control sleeve (11) through a thread, and the position control sleeve (11) is provided with a rotating wheel (12) on the outside.

3. A road bridge construction slab structure according to claim 2, characterized in that The fixed leg (26) has a support plate (25) at the bottom, the support plate (25) is connected to a limit rod (08) at the top, the fixed bottom plate (07) has a rod through hole (09), the limit rod (08) is adapted to the rod through hole (09), the limit rod (08) passes through the rod through hole (09), the fixed leg (26) has a strip through hole (24) at the middle, the strip through hole (24) is adapted to the gear plate (20), the gear plate (20) passes through the strip through hole (24), the gear plate (20) fits the fixed leg (26), the fixed leg (26) is connected to a motor (23), the motor (23) is connected to a drive shaft (22), the drive shaft (22) passes through the fixed leg (26), and the drive shaft (22) is connected to the gear plate (20).

4. A road and bridge construction slab structure according to claim 3, characterized in that The fixed support leg (26) is externally connected to a movable support sleeve (28), the movable support sleeve (28) has a movable pressing plate (27) at the bottom, the movable pressing plate (27) is fitted to the support plate (25), the support plate (25) has a plurality of cone rod through holes (30), the positioning cone rod (29) is adapted to the cone rod through holes (30), the cone rod through holes (30) pass through the positioning cone rod (29), and the cone rod through holes (30) are connected to the movable pressing plate (27).

5. A road and bridge construction slab structure according to claim 4, characterized in that The fixed support leg (26) is divided into an outer movable support sleeve (281) and an inner movable support sleeve (282), the outer movable support sleeve (281) is connected to the inner movable support sleeve (282), the inner side of the inner movable support sleeve (282) has a slide groove (36), the slide groove (36) is adapted to the gear plate (20), the gear plate (20) is connected to the slide groove (36), the inner side of the outer movable support sleeve (281) has a rack (21), the rack (21) is meshed with the gear plate (20), and the gear plate (20) is connected to the rack (21).

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