Simple steel arch mounting trolley

Abstract

A simple steel arch mounting trolley is composed of a portal trolley, a longitudinal trolley system, a vertical trolley system and a lifting mechanism system and is advanced and reasonable in structure and low in cost. A worker can assemble the steel arch frame by standing on the ground, and safety and high efficiency are achieved; the working platform of the mounting trolley can be used for mounting and welding the connecting steel bars and the steel bar meshes of the steel arch, and is simple and convenient. And the concrete spraying operation can be carried out by virtue of the working platform for mounting the trolley.

Description

Technical Field

[0001] The utility model relates to steel arch frame installation equipment in the construction of underground projects such as tunnels and subways, and a simple steel arch frame installation trolley. Background Art

[0002] At present, there are two methods for installing steel arch frames in domestic tunnel and subway construction:

[0003] 1. Install the steel arch frame with the help of a simple stand. Use a loader to lift the upper steel arch frame and place it on a simple door frame, and then manually lift the steel arch frame for installation. This method is labor-intensive, requires a large number of people, has low efficiency, and takes a long time to complete.

[0004] 2. Use a vehicle-mounted trolley to install the steel arch frame. This vehicle-mounted trolley has three grippers that can simultaneously grab three sections of steel arch frames for installation. It is highly efficient and has low labor intensity for workers. However, the vehicle-mounted trolley is expensive and some construction units cannot afford it. In addition, the vehicle-mounted trolley is not suitable for tunnels constructed using the step method. Summary of the invention

[0005] In order to solve the problems existing in the current installation of tunnel steel arch frames, the utility model designs a simple steel arch frame installation trolley, which consists of a gantry trolley, a longitudinal trolley system, a vertical trolley system and a lifting mechanism system. The gantry platform consists of four trolley columns, two bottom longitudinal beams, two upper longitudinal beams, two upper cross beams and four walking wheel groups, two walking wheels are installed under each bottom longitudinal beam, two columns are installed on the top of each bottom longitudinal beam, the upper ends of the two columns are connected by an upper longitudinal beam, and the two groups of columns are connected by two upper cross beams, the longitudinal trolley system is installed on the upper part of the gantry trolley, the vertical trolley system is installed at the front end of the longitudinal trolley, and the lifting mechanism system is installed on the vertical trolley.

[0006] The longitudinal trolley system of the simple steel arch frame installation trolley is composed of two longitudinal guide rails, a longitudinal trolley, a winch A, a longitudinal hydraulic cylinder, a longitudinal oil cylinder rear supporting crossbeam, two longitudinal guide rail legs and two longitudinal guide rail leg hydraulic cylinders. The two longitudinal guide rails are respectively installed on the upper ends of the vertical columns on both sides of the gantry trolley. The length of the two longitudinal guide rails is greater than the length of the gantry trolley. A longitudinal guide rail connecting crossbeam is installed at the front end of the two longitudinal guide rails. Under the front end of each longitudinal guide rail, it is hinged to a longitudinal guide rail leg through a pin shaft C respectively. A leg hydraulic cylinder is installed at the lower end of each longitudinal guide leg. The four walking wheels of the longitudinal trolley walk in the two longitudinal guide rails respectively. The longitudinal trolley consists of four longitudinal trolley walking wheels, two The longitudinal trolley is composed of a longitudinal trolley wheel axle, two longitudinal trolley longitudinal beams and two longitudinal trolley cross beams. Two longitudinal trolley running wheels are installed at both ends of each longitudinal trolley wheel axle. Bearings are installed inside each longitudinal trolley running wheel. The two longitudinal trolley longitudinal beams and the two longitudinal trolley cross beams form a rectangular frame structure. The longitudinal beam of each longitudinal trolley is connected to the two longitudinal trolley wheel axles through two longitudinal trolley connecting parts to form a whole. The front end of the piston rod of the longitudinal hydraulic cylinder is hinged to the longitudinal trolley, and the rear end of the longitudinal oil cylinder is connected to the rear supporting cross beam of the longitudinal oil cylinder. The rear supporting cross beam of the longitudinal oil cylinder is connected to the two longitudinal guides. The front end of the longitudinal trolley is hinged to the vertical trolley system through a pin shaft A. The winch A is installed on the longitudinal trolley, and the wire rope A is connected to the lower end of the vertical trolley system.

[0007] The vertical trolley system of the simple steel arch frame installation trolley is composed of two vertical guide rails, a winch B, a vertical guide rail upper connecting rod and a vertical guide rail lower connecting rod, a vertical trolley and two vertical guide rail outrigger oil cylinders. The two vertical guide rails and the vertical guide rail upper connecting rod and the vertical guide rail lower connecting rod form a rectangular frame structure. A vertical guide rail outrigger oil cylinder is installed under each vertical guide rail. The four running wheels of the vertical trolley are divided into two groups and run in the two vertical guide rails. The winch B is installed at the upper end of the vertical trolley system. The wire rope B is connected to the vertical trolley. The vertical trolley is composed of four running wheels, two vertical trolley wheel axles, two vertical trolley longitudinal beams and two vertical trolley cross beams. A vertical trolley running wheel is installed at both ends of each vertical trolley wheel axle. The two vertical trolley longitudinal beams and the two vertical trolley cross beams form a rectangular frame, which is connected to the two vertical trolley wheel axles through four vertical trolley supports.

[0008] The lifting mechanism system of the simple steel arch frame installation trolley is composed of a transverse trolley, a steel arch frame support assembly, a working platform system, a lifting mechanism support beam and a lifting mechanism oblique support. The lifting mechanism support beam and the lifting mechanism oblique support are installed on the vertical trolley. The transverse trolley is composed of two transverse trolley guide rails, a transverse trolley hydraulic cylinder, two transverse trolley wheel axles, four transverse trolley running wheels, two transverse trolley longitudinal beams, a connecting plate of two transverse trolley longitudinal beams, a lifting hydraulic cylinder, and a transverse trolley cylinder rear support beam. A running wheel is installed at each end of each transverse trolley wheel axle, and the running wheel runs in the two transverse trolley guide rails. Each transverse trolley running wheel is installed inside The bearings are installed on the two transverse trolley guide rails, the two transverse trolley longitudinal beams are installed on the two transverse trolley wheel axles, a transverse trolley longitudinal beam connecting plate is installed on the two transverse trolley longitudinal beams, the lifting hydraulic cylinder is installed on the lower plane of the transverse trolley longitudinal beam connecting plate, the front end of the piston rod of the lifting hydraulic cylinder is installed with a front flange plate, the front end of the transverse trolley hydraulic cylinder is connected to the transverse trolley wheel axle, the rear end of the transverse trolley hydraulic cylinder is connected to the rear support beam of the transverse trolley cylinder, the rear support beam of the transverse trolley cylinder is connected to the two transverse trolley guide rails, the steel arch frame support assembly is installed on the front end flange plate of the lifting cylinder piston rod through the bottom plate, and the steel arch frame support assembly consists of steel The arch frame arc-shaped supporting member, baffle, clamping cylinder and steel arch frame clamp are composed. The steel arch frame arc-shaped supporting member is composed of an upper arc-shaped plate, a middle web and a bottom flat plate. Two clamping cylinders are installed on the middle web. The steel arch frame clamp is installed on the front end of the clamping cylinder piston rod. The steel arch frame baffle is installed on one side of the steel arch frame arc-shaped supporting member. The working platform system is installed on the left side of the lifting mechanism support beam. The working platform system is composed of a fixed working platform and two telescopic working platforms. The fixed working platform is composed of two C-shaped fixed guide rails and a fixed working platform pedal. The two C-shaped fixed guide rail openings are relatively installed on the support beam of the lifting mechanism system. Installed on the upper plane of two C-shaped fixed guide rails, two telescopic work platforms are installed at both ends of the fixed work platform, each telescopic work platform is composed of two telescopic work platform longitudinal beams, a telescopic work platform pedal, several telescopic work platform cross-linking rods and a telescopic work platform cylinder, the two telescopic work platform longitudinal beams are located inside the two C-shaped fixed guide rails, and the two telescopic work platform longitudinal beams are connected by several telescopic work platform cross-linking rods. The telescopic work platform pedal is installed on the telescopic work platform cross-linking rod, the front end of the telescopic work platform cylinder is hinged to the telescopic platform cross-linking rod, and the rear end of the telescopic hydraulic work platform cylinder is hinged to the rear support rod of the telescopic work platform hydraulic cylinder.

[0009] The beneficial effects of the utility model are:

[0010] 1. The portal structure can greatly reduce costs and has a wider application range, and can be used in tunnels of all sizes.

[0011] 2. Workers can connect steel arch frames one by one while standing on the ground, which is safe and efficient and reduces the labor intensity of workers.

[0012] 3. The overall steel arch lifting installation method is conducive to ensuring the verticality and spacing of the steel arch, and is conducive to ensuring the installation quality.

[0013] 4. Multifunctional. Workers can also use this trolley to spray concrete. BRIEF DESCRIPTION OF THE DRAWINGS The following is a description of the specific embodiments of the present invention in conjunction with the accompanying drawings:

[0014] Figure 1 Schematic diagram of the longitudinal section structure of the simple steel arch installation trolley

[0015] Figure 2 The left view of the simple steel arch installation trolley

[0016] Figure 3 Schematic diagram of the longitudinal section structure of the simple steel arch installation trolley lifting the upper steel arch

[0017] Figure 4 The left view of the structure of the simple steel arch installation trolley lifting the upper steel arch

[0018] Figure 5 The simplified steel arch installation trolley is connected to the longitudinal section of the middle steel arch.

[0019] Figure 6 The left view of the structure of the simple steel arch installation trolley connected to the middle steel arch

[0020] Figure 7 The schematic diagram of the longitudinal section structure of the simple steel arch installation trolley connected to the lower steel arch

[0021] Figure 8 The left view of the structure of the simple steel arch installation trolley connected to the lower steel arch

[0022] Fig. 9 Schematic diagram of the longitudinal section structure of the simple steel arch installation trolley lifting cylinder lifting the entire steel arch to the set height

[0023] Fig.10 A partial enlarged view of the lifting mechanism assembly (29) and the vertical trolley (23) of the simple steel arch mounting trolley

[0024] Among them, 1-gantry column, 2-longitudinal hydraulic cylinder, 3-rear support beam of longitudinal hydraulic cylinder, 4-longitudinal trolley system, 5-longitudinal guide rail A, 6-pin shaft A, 7-winch A, 8-longitudinal trolley, 9-wire rope A, 10-longitudinal trolley longitudinal beam, 11-longitudinal trolley running wheel, 12-longitudinal trolley wheel axle, 13-longitudinal trolley crossbeam, 14-longitudinal guide rail outrigger, 15-longitudinal guide rail outrigger cylinder, 16-vertical guide rail upper Connecting rod, 17- winch B, 18- vertical trolley system, 19- wire rope B, 20- vertical guide rail, 21- pin shaft B, 22- vertical trolley crossbeam, 23- vertical trolley, 24- vertical trolley walking wheel, 25- vertical trolley wheel axle, 26- vertical trolley longitudinal beam, 27- vertical guide rail lower connecting rod, 28- vertical trolley guide rail outrigger cylinder, 29- lifting mechanism system, 30- horizontal trolley hydraulic cylinder, 31- horizontal trolley Wheel axle, 32-transverse trolley walking wheel, 33-transverse trolley, 34-transverse trolley guide rail, 35-elevation mechanism support beam, 36-telescopic working platform cylinder, 37-telescopic working platform horizontal connecting rod, 38-working platform system, 39-fixed guide rail, 40-fixed workbench pedal, 41-movable workbench pedal, 42-telescopic workbench longitudinal beam, 43-transverse trolley longitudinal beam, 44-lifting hydraulic cylinder, 45-transverse trolley longitudinal beam Connecting plate, 46- front flange plate of lifting cylinder piston rod, 47- steel arch frame clip, 48- steel arch frame support assembly, 49- steel arch frame support arc frame, 50- baffle, 51- clamping hydraulic cylinder, 52- pin shaft C, 53- top steel arch frame, 54- first section of steel arch frame on both sides, 55- lower steel arch frame on both sides, 56- bottom longitudinal beam, 57- walking wheel set, 58- upper longitudinal beam, 59- gantry trolley, 60- upper cross beam. 61- longitudinal guide rail connecting cross beam, 62- longitudinal trolley connector, 63- vertical trolley support plate, 64- lifting mechanism diagonal brace, 65- rear support beam of horizontal trolley cylinder, 66- upper arc plate, 67- middle web plate, 68- bottom plate, 69- rear support rod of telescopic working platform hydraulic cylinder DETAILED DESCRIPTION

[0025] 1. Make preparations for the installation of steel arch frames.

[0026] 1. Move the tunnel construction steel arch installation trolley to the working position and support the longitudinal guide leg cylinder (15).

[0027] 2. The steel wire rope A (9) of the winch A (7) is loosened, and the vertical trolley system (18) starts to rotate around the hinge shaft A (21), and the lower end of the vertical trolley system (18) starts to fall until it is in a vertical state.

[0028] 3. Check whether the upper curved plate (66) of the lifting mechanism system (29) is at the predetermined position of the steel arch frame installation. If there is a deviation, the longitudinal hydraulic reversing valve can be used to control the hydraulic cylinder A (2) to push the longitudinal trolley (8) to move left and right, so that the upper curved plate (66) can be moved to the predetermined position.

[0029] 4. Support the outrigger hydraulic cylinder (28) at the bottom of the vertical trolley system (18).

[0030] 2. Start installing the steel arch

[0031] 1. Place the two steel arches on the top of the tunnel on the upper curved plate (66), close to the baffle (50), and connect them with bolts to form a whole, aligning the joints of the two steel arches with the center line of the upper curved plate (66).

[0032] 2. Retract the piston rod of the clamping oil cylinder (51) so that the clamp (47) clamps the steel arch.

[0033] (See Figure 3 and Figure 4 )

[0034] 3. Start the hoisting machine B (17), and the steel wire rope B (19) pulls the vertical trolley (23), the lifting mechanism system (29) and the top steel arch frame (53) to rise together. When the hoisting machine B (17) is raised to an appropriate position, the worker stands on the ground and connects the first section of the steel arch frame (54) on both sides with the upper steel arch frame (53) with bolts.

[0035] (See Figure 5 and Figure 6 )

[0036] 4. Start the hoist B (17) again, and the steel wire rope B (19) pulls the vertical trolley (23), the lifting mechanism system (29) and the steel arch frame to rise together. When the lifting reaches a proper height, the hoist B (17) is suspended. The worker stands on the ground and connects the lower steel arch frames (55) on both sides with the upper steel arch frames (54) with bolts.

[0037] (See Figure 7 and Figure 8 )

[0038] If there are steel arch frames on both sides, continue to connect and install them according to the above method.

[0039] 5. Start the hoist B (17) again, and the steel wire rope B (19) pulls the vertical trolley (23), the lifting mechanism system (29) and the entire steel arch frame to the highest point.

[0040] 6. Operate the reversing valve of the lifting hydraulic cylinder (44) to extend the piston rod of the lifting hydraulic cylinder (44), and the steel arch support assembly (48) and the entire steel arch continue to rise to a predetermined height.

[0041] (See Fig. 9 )

[0042] 7. Operate the reversing valve of the lateral trolley hydraulic cylinder (30) to extend or shorten the piston rod of the lateral trolley hydraulic cylinder (30), drive the lateral trolley (33) and the integral steel arch frame to adjust the lateral position of the tunnel, and move the integral steel arch frame to the specified position.

[0043] 8. Start welding the steel arch frame to connect the steel bars and steel mesh from the lower part of both sides of the steel arch frame to fix the steel arch frame.

[0044] 9. Operate the reversing valve of the clamping oil cylinder (51) to extend the piston rod, so that the clamp (47) releases the steel arch.

[0045] 11. The lifting cylinder (44) is retracted and the winch B (17) is released, so that the vertical trolley (23) and the lifting mechanism assembly (29) fall to the lowest position.

[0046] 12. Operate the reversing valve of the oil cylinder (36) of the telescopic working platform to extend the piston rods of the oil cylinders (36) of the two telescopic working platforms, pushing the telescopic working platforms at both ends to extend. The installation worker goes up to the working platform.

[0047] 13. Start the hoist B (17), and the steel wire rope B (19) pulls the vertical trolley (23) and the working platform to gradually rise. The height is adjusted according to the working situation until the installation and welding of the connecting steel bars and the steel mesh at the high position is completed.

[0048] At this point the installation of the steel arch frame is complete.

[0049] Afterwards, workers can use the lifting and lowering of this work platform to carry out shotcrete operations.

[0050] 3. Closing the Work

[0051] When all the work is completed, you can start to finish the work.

[0052] 1. Retract the outrigger cylinder (28) of the vertical trolley system (18).

[0053] 2. Start the winch A (7), and the wire rope A (9) gradually pulls up the lower end of the vertical trolley system (18), so that the vertical guide rail (20) is in a horizontal state.

[0054] 3. The piston rod of the longitudinal hydraulic cylinder (2) contracts, moving the longitudinal trolley (8), the vertical trolley system (18) and the lifting mechanism system (29) to the left.

[0055] 4. Retract the outrigger cylinders (15) and move the entire trolley backwards to a position where it does not affect excavation.

Claims

1. A simple steel arch frame installation trolley, which consists of a gantry trolley (59), a longitudinal trolley system (4), a vertical trolley system (18) and an elevation mechanism system (29), wherein the gantry trolley (59) consists of four trolley columns (1), two bottom longitudinal beams (56), two upper longitudinal beams (58), two upper cross beams (60) and four running wheel groups (57), two running wheel groups (57) are installed below each bottom longitudinal beam (56), two columns (1) are installed above each bottom longitudinal beam (56), the upper ends of the two columns (1) are connected by the upper longitudinal beam (58), and the two groups of columns (1) are connected by two upper cross beams (60), the longitudinal trolley system (4) is installed on the upper part of the gantry trolley (59), the vertical trolley system (18) is installed at the front end of the longitudinal trolley (8), and the elevation mechanism system (29) is installed on the vertical trolley (23), wherein: A longitudinal trolley system (4), a vertical trolley system (18) and a lifting mechanism system (29) are installed on the gantry trolley (59).

2. The simple steel arch installation trolley according to claim 1 is characterized in that: The longitudinal trolley system (4) is composed of two longitudinal guide rails (5), a longitudinal trolley (8), a winch A (7), a longitudinal hydraulic cylinder (2), a longitudinal cylinder rear support beam (3), two longitudinal guide rail legs (14) and two longitudinal guide rail leg hydraulic cylinders (15). The two longitudinal guide rails (5) are respectively installed on the upper ends of the columns (1) on both sides of the gantry trolley (59). The length of the two longitudinal guide rails (5) is greater than the length of the gantry trolley (59). A longitudinal guide rail connecting crossbeam (61) is installed at the front end of the rail (5). Below the front end of each longitudinal guide rail (5), it is hinged to a longitudinal guide rail support leg (14) through a pin shaft C (52). A support leg hydraulic cylinder (15) is installed at the lower end of each longitudinal guide rail support leg (14). Four longitudinal trolley running wheels (11) of the longitudinal trolley (8) respectively run in two longitudinal guide rails (5). The longitudinal trolley (8) consists of four longitudinal trolley running wheels (11), two longitudinal trolleys, and a longitudinal trolley. The invention relates to a wheel axle (12), two longitudinal trolley longitudinal beams (10), and two longitudinal trolley cross beams (13). Two longitudinal trolley running wheels (11) are installed at both ends of each longitudinal trolley wheel axle (12). A bearing is installed inside each longitudinal trolley running wheel (11). The two longitudinal trolley longitudinal beams (10) and the two longitudinal trolley cross beams (13) form a rectangular frame structure. The longitudinal beam (10) of each longitudinal trolley is connected to the two longitudinal trolley wheel axles (11) through two longitudinal trolley connecting pieces (62). 2) are connected to form an integral body, the front end of the piston rod of the longitudinal hydraulic cylinder (2) is hinged to the longitudinal trolley (8), the rear end of the longitudinal hydraulic cylinder (2) is connected to the rear support beam (3) of the longitudinal cylinder, the rear support beam (3) of the longitudinal cylinder is connected to the two longitudinal guide rails (5), the front end of the longitudinal trolley (8) is hinged to the vertical trolley system (18) through a pin shaft A (21), the winch A (7) is installed on the longitudinal trolley (8), and the wire rope A is connected to the lower end of the vertical trolley system (18).

3. The simple steel arch installation trolley according to claim 1 is characterized in that: The vertical trolley system (18) is composed of two vertical guide rails (20), a winch B (17), a vertical guide rail upper connecting rod (16), a vertical guide rail lower connecting rod (27), a vertical trolley (23) and two vertical guide rail outrigger oil cylinders (28). The two vertical guide rails (20) and the vertical guide rail upper connecting rod (16) and the vertical guide rail lower connecting rod (27) form a rectangular frame structure. A vertical guide rail outrigger oil cylinder (28) is installed under each vertical guide rail (20). The four vertical trolley running wheels (24) of the vertical trolley (23) are divided into two groups and run in the two vertical guide rails (20). The winch B (17) is installed at the upper end of the vertical trolley system (18), and the wire rope B (19) is connected to the vertical trolley (23). The vertical trolley (23) is composed of four vertical trolley running wheels (24), two vertical trolley wheel axles (25), two vertical trolley longitudinal beams (26) and two vertical trolley cross beams (22). A vertical trolley running wheel (24) is installed at each end of each vertical trolley wheel axle (25). The two vertical trolley longitudinal beams (26) and the two vertical trolley cross beams (22) form a rectangular frame and are connected to the two vertical trolley wheel axles (25) through four vertical trolley support plates (63).

4. The simple steel arch installation trolley according to claim 1 is characterized in that: The mechanism system (29) is composed of a transverse trolley (33), a steel arch support assembly (48), a working platform system (38), a lifting mechanism support beam (35) and a lifting mechanism oblique support (64). The lifting mechanism support beam (35) and the lifting mechanism oblique support (64) are installed on the vertical trolley (23). The transverse trolley (33) is composed of two transverse trolley guide rails (34), a transverse trolley hydraulic cylinder (30), two transverse trolley wheel axles (31), four transverse trolley running wheels (32), two transverse trolley longitudinal beams (43), two transverse trolley longitudinal beam connecting plates (45), a lifting hydraulic cylinder (44), and a transverse trolley cylinder rear support beam (65). The two transverse trolley wheels (31) of each transverse trolley wheel axle (31) are connected to the lifting mechanism support beam (35). A transverse trolley running wheel (32) is installed at each end, the transverse trolley running wheel (32) runs in two transverse trolley guide rails (34), a bearing is installed in each transverse trolley running wheel (32), the two transverse trolley guide rails (34) are installed on the lifting mechanism support beam (35), two transverse trolley longitudinal beams (43) are installed on two transverse trolley wheel axles (31), a transverse trolley longitudinal beam connecting plate (45) is installed on the two transverse trolley longitudinal beams (43), a lifting hydraulic cylinder (44) is installed on the lower plane of the transverse trolley longitudinal beam connecting plate (45), a front end flange plate (46) is installed at the front end of the piston rod of the lifting hydraulic cylinder (44), and the front end of the transverse trolley hydraulic cylinder (30) is connected to the transverse trolley wheel axle. (31), the rear end of the transverse trolley hydraulic cylinder (30) is connected to the rear support beam (65) of the transverse trolley cylinder, the rear support beam (65) of the transverse trolley cylinder is connected to the two transverse trolley guide rails (34), the steel arch frame support assembly (48) is installed on the front flange plate (46) of the piston rod of the lifting hydraulic cylinder (44) through the bottom plate (66), the steel arch frame support assembly (48) is composed of a steel arch frame arc support member (49), a baffle (50), a clamping cylinder (51) and a steel arch frame clamp (47), the steel arch frame arc support member (49) is composed of an upper arc plate (68), an intermediate web plate (67) and a bottom plate (66), two clamping cylinders (51) are installed on the intermediate web plate (67), A steel arch frame clamp (47) is installed at the front end of the piston rod of the clamping cylinder (51), and the steel arch frame baffle (50) is installed on one side of the steel arch frame arc-shaped supporting member (49). The working platform system (38) is installed on the left side of the lifting mechanism support beam (35). The working platform system (38) consists of a fixed working platform and two telescopic working platforms. The fixed working platform consists of two C-shaped fixed guide rails (39) and a fixed working platform pedal (40). The openings of the two C-shaped fixed guide rails (39) are relatively installed on the support beam (35) of the lifting mechanism system (29). The fixed working platform pedal (40) is installed on the upper plane of the two C-shaped fixed guide rails (39). The two telescopic working platforms are installed at both ends of the fixed working platform.Each telescopic working platform is composed of two telescopic working platform longitudinal beams (42), a telescopic working platform pedal (41), a plurality of telescopic working platform transverse connecting rods (37) and a telescopic working platform oil cylinder (36). The two telescopic working platform longitudinal beams (42) are located inside two C-shaped fixed guide rails (39). The two telescopic working platform longitudinal beams (42) are connected by a plurality of telescopic working platform transverse connecting rods (37). The telescopic working platform pedal (41) is installed on the telescopic working platform transverse connecting rod (37). The front end of the telescopic working platform oil cylinder is hinged to the telescopic platform transverse connecting rod (37). The rear end of the telescopic hydraulic working platform oil cylinder (36) is hinged to the telescopic working platform hydraulic cylinder rear support rod (69).

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