Tunnel lagging jack transportation equipment

Abstract

The utility model relates to tunnel lagging jack transportation equipment which comprises a self-walking engineering vehicle chassis, a front cab, a rear cab, a crane and a supporting tool used for bearing a lagging jack, the front cab is arranged in front of the engineering vehicle chassis, the rear cab is detachably arranged behind the engineering vehicle chassis, and the crane is further arranged in front of the engineering vehicle chassis; a supporting tool is arranged on a chassis of the engineering vehicle, the supporting tool is a multi-truss supporting frame or a folding supporting frame, the multi-truss supporting frame and the folding supporting frame can be borne conveniently and respectively, each of the multi-truss supporting frame and the folding supporting frame comprises a bottom frame and a top frame, the bottom frames are detachably connected to a vehicle frame, the bottom frames are vertically arranged, and the top frames are horizontally arranged above the bottom frames. A clamping groove used for positioning the arch frame is formed in the middle of the top frame, the arch frame is prevented from moving front and back, the distance between the two ends of the top frame is adjustable, arch frames with different widths can be borne conveniently, and a pressing assembly used for fixing the arch frame is further arranged at the end of the top frame. According to the utility model, loading, unloading and transporting functions of different types of lagging jacks can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to steel arch transport technical field especially relates to a tunnel arch transport equipment. BACKGROUND

[0002] Steel arch is a kind of steel frame of bending shape, it is usually used for the support of tunnel. After tunnel excavation, arch is transported to tunnel by equipment, and arch is erected in tunnel, and the arch that is bent to arch shape is used to provide support, prevent surrounding rock instability. At present, arch transport mode is various, and loader is usually used to hoist and transport arch by sling, this mode has poor applicability, poor throughness in hole, low safety and other problems. And after loader reaches working face, arch cannot be conveniently placed to suitable installation position and state, so that arch transport and installation overall efficiency is low.

[0003] In view of the above status, the prior art for the transport mode of arch is continuously improved, for example, the folding arch transport vehicle disclosed in patent publication No. CN210454586U, its transport vehicle structure is complex, different complete self-loading, self-unloading and arch placing function, and it is only suitable for the transport of folding arch. Such as patent publication No. CN117698543A disclosed tunnel arch transport vehicle, can realize the lifting and rotation of arch, promote arch to change height and arrangement direction, but the flexibility of arch placement is poor, and the transport vehicle is only suitable for multiple arch, has certain limitation.

[0004] With the application and popularization of multiple arch, folding arch and other arch forms and multiple arch installation construction method, there is a lack of a special arch transport machinery in tunnel, which can meet the throughness of different tunnel sections, the loading and transport of different arch types, and the self-possessed arch quick loading and unloading and placing function of a tunnel arch transport equipment. SUMMARY

[0005] The utility model discloses a tunnel arch transport equipment to solve the problem that conventional arch transport equipment has poor adaptability and is difficult to flexibly place arch, uses engineering vehicle chassis as transport carrier, and different types of supporting tooling can be detachably installed on the engineering vehicle chassis, can load multiple arch and folding arch, and the engineering vehicle chassis is provided with a crane, which can flexibly load and place arch in the tunnel.

[0006] To achieve the above purpose, the technical scheme adopted by the utility model is:

[0007] A tunnel arch support transportation device, comprising a self-walking engineering vehicle chassis, a front cab, a rear cab, a crane and a support tool for carrying the arch support, the front cab is arranged in front of the engineering vehicle chassis, the rear cab is detachably arranged at the rear of the engineering vehicle chassis, and the rear cab is selectively installed according to the type of the transported arch support; the crane is arranged in front of the engineering vehicle chassis, facilitating loading and unloading and placing of the arch support.

[0008] The support tool is arranged on the engineering vehicle chassis, and the support tool is a multi-arch support frame or a folding support frame, facilitating carrying of the multi-arch support frame and the folding support frame respectively; the multi-arch support frame and the folding support frame both comprise a bottom frame and a top frame, the bottom frame is detachably connected to the vehicle frame, the bottom frame is vertically arranged, the top frame is horizontally arranged above the bottom frame, a clamping groove for positioning the arch support is arranged in the middle of the top frame, preventing the arch support from moving forward and backward, the distance between the two ends of the top frame is adjustable, facilitating carrying of arch supports with different widths, and a pressing assembly for fixing the arch support is further arranged at the end of the top frame.

[0009] Further, the engineering vehicle chassis comprises a vehicle frame, a hydraulic power station, drive wheels controlled by the hydraulic power station and hydraulic legs, the hydraulic power station is arranged on one side of the front end of the vehicle frame, the front cab is arranged on the other side of the front end of the vehicle frame, and the crane is arranged on the vehicle frame between the front cab and the hydraulic power station; the rear cab is bolted to the rear end of the vehicle frame, facilitating disassembly and assembly of the rear cab.

[0010] Further, four drive wheels are arranged below the vehicle frame, a hydrostatic transmission system is arranged between the drive wheels and the hydraulic power station for connection, facilitating four-wheel drive; four hydraulic legs are further arranged below the vehicle frame, and the hydraulic legs and the drive wheels are in one-to-one correspondence, ensuring the stability of the engineering vehicle chassis.

[0011] Further, the crane comprises a rotating unit and a telescopic arm, the rotating unit is arranged on the vehicle frame, the rotating unit is driven to rotate, a rotating seat is arranged above the rotating unit, facilitating rotation of the rotating seat, the telescopic arm is hinged to the rotating seat, and a luffing cylinder is arranged between the telescopic arm and the rotating seat to control luffing of the telescopic arm.

[0012] Further, a collision rod is arranged on the telescopic arm, the collision rod extends downward out of the telescopic arm, a limit switch is arranged on the top of the front cab, the limit switch is connected to the rotating unit, and the rotating seat stops rotating when the collision rod abuts against the limit switch.

[0013] Further, the bottom frame comprises a rectangular frame welded by steel pipes and a stand arranged at the corners of the rectangular frame, the number of the stands is four, the stands are vertically arranged, the stands are bolted to the vehicle frame downward, and the stands are connected and fixed to the top frame upward.

[0014] Further, the top frame is a "mouth" shaped frame structure welded by steel pipes, a clamping arm bent in an "L" shape is movably arranged at a corner of the top frame, a horizontal end of the clamping arm is inserted into the top frame and is slidably connected with the top frame, a jacking screw is further arranged at the corner of the top frame, the jacking screw penetrates into the top frame and abuts against the clamping arm, so that the clamping arm is fixed.

[0015] Further, a pressing assembly is arranged at a vertical end of the clamping arm, the pressing assembly comprises a control lever and a pressing cam controlled by the control lever, the control lever is rotationally connected with the clamping arm, and the pressing cam is connected with one end of the control lever, and the pressing cam extrudes the arch frame downward.

[0016] By the above technical scheme, the tunnel arch frame transportation equipment has the following advantages:

[0017] The arch frame is reliably fixed on the support tool through the middle clamping groove, the L-shaped clamping arms at two ends, the jacking screw and the pressing assembly.

[0018] The front cab is installed on the left upper portion of the frame, which conforms to the driving habit and has a better view, and the rear cab is installed on the middle position of the tail of the frame through bolts, so that the problem of difficult turning in the hole is solved; when a plurality of arch frames are transported, the front and rear driving can be performed without turning in the tunnel, and when the folded arch frame is transported, the rear cab needs to be removed and replaced with a folded support frame.

[0019] The engineering vehicle chassis of the tunnel arch frame transportation equipment adopts a hydrostatic transmission system, a hydraulic power station is installed on one side of the head of the vehicle, the upper plane of the frame is not interfered by the arrangement of the hydraulic power station and the transportation of the folded arch frame, the height of the loading platform of the vehicle is reduced, and the arch frame transportation equipment has the conditions of transporting a plurality of arch frames and folded arch frames. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic view of the engineering vehicle chassis of the tunnel arch frame transportation equipment of the utility model for transporting a plurality of arch frames.

[0021] Figure 2 is a schematic view of the engineering vehicle chassis of the tunnel arch frame transportation equipment of the utility model for transporting a folded arch frame.

[0022] Figure 3 is a rear cab schematic view of the tunnel arch transport equipment of the utility model.

[0023] Figure 4 is a collision rod and limit switch separation schematic view of the tunnel arch transport equipment of the utility model.

[0024] Figure 5 is a collision rod abutting limit switch schematic view of the tunnel arch transport equipment of the utility model.

[0025] Figure 6 is a multi-arch support frame schematic view of the tunnel arch transport equipment of the utility model.

[0026] Figure 7 is a clamping arm and pressing assembly schematic view of the tunnel arch transport equipment of the utility model.

[0027] Figure 8 is a folding support frame schematic view of the tunnel arch transport equipment of the utility model.

[0028] Figure 9 is a multi-arch in tunnel arch transport equipment of the utility model is shown in the schematic view of swinging.

[0029] Figure 10 is a folding arch in tunnel arch transport equipment of the utility model is shown in the schematic view of swinging.

[0030] The figure mark is: 1 frame, 2 hydraulic power station, 3 drive wheel, 4 hydraulic support leg, 5 front cab, 6 rear cab, 7 crane, 8 multi-arch support frame, 9 folding support frame, 10 flange connecting plate, 11 rotating seat, 12 telescopic arm, 14 collision rod, 15 limit switch, 16 bottom frame, 161 rectangular frame, 162 stand, 17 top frame, 18 clamping slot, 19 clamping arm, 20 top pressing screw, 21 pressing assembly, 211 operating lever, 212 pressing cam, 22 lifting lug, 23 engineering vehicle chassis. DETAILED DESCRIPTION

[0031] The specific embodiment of the utility model is described in detail in combination with the drawings as follows:

[0032] As Figures 1-10As shown, a tunnel arch transport equipment includes a self-walking engineering vehicle chassis 23, the engineering vehicle chassis 23 has a self-walking function. The engineering vehicle chassis 23 includes a frame 1, a hydraulic power station 2 for providing power for the engineering vehicle chassis 23, drive wheels 3 and hydraulic outriggers 4 controlled by the hydraulic power station 2. The hydraulic power station 2 is arranged on one side of the front end of the frame 1, and the hydraulic power station 2 is arranged on the right side of the front end of the frame 1. The hydraulic power station 2 is a prior art, and the hydraulic power station 2 is used to store hydraulic oil and is responsible for converting hydraulic oil into hydraulic energy to provide power and control capability.

[0033] Four drive wheels 3 are arranged below the frame 1, and a hydrostatic transmission system is arranged between the drive wheels 3 and the hydraulic power station 2 to realize connection, thereby realizing four-wheel drive. The hydrostatic transmission system is a prior art, which is composed of an oil pump, a hydraulic motor and a pipeline, and the hydrostatic transmission system is arranged between the hydraulic power station 2 and the drive wheels 3 to transmit power. The hydrostatic transmission system is not shown in the figure. The hydraulic power station 2 provides hydraulic power to control the operation of the hydraulic motor in the hydrostatic transmission system to drive the drive wheels 3 to run, thereby realizing the driving of the engineering vehicle chassis 23. Four hydraulic outriggers 4 are also arranged below the frame 1, and the hydraulic outriggers 4 correspond to the drive wheels 3 one by one. The hydraulic outriggers 4 here adopt H-shaped outriggers, and the hydraulic outriggers 4 have supporting and leveling functions. The whole vehicle is lifted during hoisting operation to meet the stability of the whole machine under various working conditions during operation.

[0034] The arch transport equipment also includes a front cab 5, a rear cab 6, a crane 7 and a support tool for carrying the arch. The front cab 5 is arranged in front of the engineering vehicle chassis 23, and the rear cab 6 is detachably arranged at the rear of the engineering vehicle chassis 23. Specifically, the front cab 5 is arranged on the other side of the front end of the frame 1, and the front cab 5 is located on the left side of the front end of the frame 1. The rear cab 6 is bolted to the rear end of the frame 1, and the rear cab 6 can be detached from the frame 1. Four flange connection plates 10 with slotted holes are arranged at the rear of the rear cab 6, which can be connected to the frame 1 by bolts, and the rear cab 6 can be removed when the folding arch is assembled or disassembled.

[0035] The front cab 5 and the rear cab 6 can both realize driving of the engineering vehicle chassis 23 by driver operation, and have a bidirectional driving function. The rear cab 6 is connected to the electrical control system on the engineering vehicle chassis 23 through a wire harness connector, and the electrical control system is a prior art. The electrical control system can control and monitor the operation of each part of the engineering vehicle chassis 23.

[0036] The crane 7 is arranged on the frame 1 between the front cab 5 and the hydraulic power station 2, and is used to load and place the arches. The crane 7 comprises a rotating unit and a telescopic arm 12. The rotating unit is arranged on the frame 1 and is driven to rotate. The rotating unit is not shown in the figure. A rotating seat 11 is arranged above the rotating unit and is driven to rotate by the rotating unit. The telescopic arm 12 is hingedly connected to the rotating seat 11. An elevation swing cylinder is arranged between the telescopic arm 12 and the rotating seat 11, and is used to control the elevation swing of the telescopic arm 12. The elevation swing cylinder is not shown. The telescopic arm 12 is a kind of prior art and has a telescopic function. The maximum amplitude of the telescopic arm 12 is 10 m, and the load capacity is 2 t.

[0037] In the normal state, the telescopic arm 12 extends forward of the engineering vehicle chassis 23. When work is needed, the telescopic arm 12 is rotated to the rear of the engineering vehicle chassis 23. The rotation of the telescopic arm 12 is controlled by the rotating unit. In order to avoid collision between the telescopic arm 12 and the front cab 5 during the rotation of the telescopic arm 12, a collision rod 14 is arranged on the telescopic arm 12 and extends downward from the telescopic arm 12. When the telescopic arm 12 swings up and down, the collision rod 14 moves up and down with it. At the same time, a limit switch 15 is arranged on the top of the front cab 5. The limit switch 15 is connected to the rotating unit and can control the stop of the rotating unit.

[0038] In order to avoid interference between the telescopic arm 12 and the front cab 5 during the rotation of the crane 7, a collision prevention measure is added. When the elevation swing angle of the telescopic arm 12 is low, the position of the collision rod 14 is also low. When the telescopic arm 12 rotates, the collision rod 14 will abut against the limit switch 15, and then the rotating unit will stop, the telescopic arm 12 will no longer continue to rotate, and the collision with the front cab 5 will be prevented. Specifically, when the elevation angle of the telescopic arm 12 is less than 25°, the collision rod 14 contacts the limit switch 15, the crane 7 stops rotating, and the collision between the telescopic arm 12 and the front cab 5 is prevented. When the angle is greater than 25°, the collision rod 14 does not contact the limit switch 15, and the crane 7 can be rotated by 360° under the drive of the rotating unit.

[0039] A support tool is arranged on the engineering vehicle chassis 23 and is used to place the arches. The support tool is a plurality of support frames 8 or a folding support frame 9. That is, the support tool has two structural forms, one is a plurality of support frames 8, and the other is a folding support frame 9. The plurality of support frames 8 can hold a plurality of arches, and the folding support frame 9 can hold a folded arch.

[0040] The multi-frame support 8 and the folding support 9 have the same structure but different dimensions. Specifically, both the multi-frame support 8 and the folding support 9 include a base frame 16 and a top frame 17. The base frame 16 is detachably connected to the frame 1 and is arranged vertically. The base frame 16 includes a rectangular frame 161 welded from steel pipes and four uprights 162 located at the corners of the rectangular frame 161. The uprights 162 are arranged vertically, bolted downwards to the frame 1, and extending upwards to connect and fix to the top frame 17.

[0041] A top frame 17 is horizontally mounted above the base frame 16. The top frame 17 is a U-shaped frame structure welded from steel pipes. To position the arch frame, two slots 18 are provided in the middle of the top frame 17 for positioning the arch frame. The two slots 18 are arranged in a straight line and are composed of two spaced-apart plates. The space between the two plates is the slot 18. When placing the arch frame, the slots 18 can serve to position it and prevent it from swaying left and right.

[0042] The distance between the two ends of the top frame 17 is adjustable, and consequently, the width of the top frame 17 is adjustable, thus allowing it to hold arch frames of different sizes to accommodate arch frames with different spacing. Specifically, four L-shaped locking arms 19 are movably installed at the corners of the top frame 17, arranged in pairs. The horizontal ends of the locking arms 19 are inserted into the top frame 17 and slidably connected to it, allowing the locking arms 19 to be pulled out. Tightening screws 20 are also installed at the corners of the top frame 17, with one tightening screw 20 at each locking arm 19. The tightening screws 20 pass through the top frame 17 and abut against the locking arm 19, locking the locking arm 19 in place.

[0043] A clamping assembly 21 for fixing the arch frame is also provided at the end of the top frame 17. Specifically, the clamping arm 19 is provided with a clamping assembly 21 at its vertical end. The clamping assembly 21 includes a control lever 211 and a clamping cam 212 controlled by the control lever 211. The control lever 211 and the clamping arm 19 are rotatably connected. One end of the control lever 211 passes through the clamping arm 19 and is connected to the clamping cam 212. The clamping cam 212 presses the arch frame downward to achieve clamping and fixing of the arch frame and prevent the arch frame from moving back and forth during transportation.

[0044] The difference between the multi-frame support 8 and the folding support 9 is that the overall height of the multi-frame support 8 is greater than that of the folding support 9; the height of the base frame 16 of the multi-frame support 8 is greater than that of the base frame 16 of the folding support 9. Both the multi-frame support 8 and the folding support 9 are equipped with lifting lugs 22, which are used to load and unload the support fixtures. Meanwhile, during the transportation of the arch frame, the road conditions are often complex. The arch frame can be secured using the lifting lugs 22 on the support frame according to the actual site conditions, further ensuring that the arch frame does not slip or sway during transportation, thus guaranteeing the safety of the arch frame transportation process.

[0045] The utility model principle is: before transportation, the arch frame of multiple units is fixed through spot welding mode, guarantee the transportation process of arch frame is an integrity, the relative sliding between arch frames does not generate, avoid vibration and slip in the transportation process, guarantee the safety of transportation process. When needing to transport multiple arch frames, install multiple support frames 8 and rear cab 6 on engineering vehicle chassis 23, the driver operates crane 7 outside the tunnel, hoists multiple arch frames to multiple support frames 8, holds the middle part of multiple arch frames in clamping groove 18 during hoisting, realizes the positioning of multiple arch frames. Then push card arm 19 inwards to make card arm 19 contact multiple arch frames, and tighten screw rod 20 to realize the fixation of card arm 19, and then realize the clamping of multiple support frames 8 to multiple arch frames. At the same time, rotating control lever 211 drives compression cam 212 to rotate, and compression cam 212 is used to compress and fix multiple arch frames.

[0046] After driving engineering vehicle chassis 23 into the tunnel, operating compression assembly 21 and tightening screw rod 20, multiple arch frames are not fixed by multiple support frames 8, and then operating crane 7 to place multiple arch frames in the tunnel. Specifically, when the vehicle drives to the working face, hydraulic outriggers 4 extend to the limit position to support the whole frame 1 off the ground. The boom 12 of crane 7 is raised to an angle of about 45°, with an amplitude of 4.75m, the hook is lowered, the card arm 19 is manually released, the lifting belt is hung on the hook, and the lifting is started. When the arch frame is lifted to the air, the lifting belt is pulled manually to adjust the direction of the arch frame parallel to the tunnel. After placing the arch frame on the working face, the direction is consistent with the direction of the tunnel and does not need to be adjusted again. Then, the units of the stacked arch frame are disassembled, and the dispersed units are adjusted to the appropriate position by crane 7 and placed to facilitate the direct lifting and splicing of the arch frame installation trolley after entering the hole.

[0047] When the folded arch frame needs to be transported, the folded support frame 9 is installed on the engineering vehicle chassis 23, and the rear cab 6 is not connected with the engineering vehicle chassis 23; referring to the fixing operation of multiple arch frames, the folded arch frame is fixed on the folded support frame 9, and then referring to the unlocking and placing operation of multiple arch frames, the folded arch frame is placed in the tunnel.

[0048] The overall machine width is limited to not more than 2.5m, the length is 7.6m, the axle distance of engineering vehicle chassis 23 is 4.6m, the rated load is 5t, the maximum climbing angle is 16°, and the minimum turning radius is 5710mm. The overall machine layout is compact and stable, without the need for additional counterweight, and the height after loading the arch frame is ≤3.6m. The vehicle can pass through the trestle, trestle, etc. in single-hole single-line, single-hole double-line and inclined shaft, with good passability.

[0049] Compared with the loader transport arch, the utility model discloses more convenient and fast, solve the existing arch transport equipment and cannot have multiple function and folding arch transport function simultaneously, the problem of no self-loading and unloading and arch placing function, simple structure passability is high, adapts to different section tunnel, improve the work efficiency of arch transport installation in tunnel. Can transport multiple arch and can take into account the transport of folding arch, can also adapt to the arch transport and loading and unloading of different section tunnels such as large section tunnel, small section tunnel, can complete the placing work of arch in tunnel working face.

[0050] The above-mentioned embodiments are only preferred embodiments of the utility model, and are not intended to limit the scope of the utility model, so equivalent changes or modifications made according to the structure, features and principles described in the utility model patent range should be included in the utility model application patent range.

Claims

1. A tunnel arch transport apparatus comprising a self-propelled engineering vehicle chassis (23) characterised in that, Also include the front cab (5), rear cab (6), crane (7) and support tool for carrying arch, the engineering vehicle chassis (23) front is provided with front cab (5), rear detachable rear cab (6) is arranged, engineering vehicle chassis (23) front is also provided with the crane (7); The engineering vehicle chassis (23) is provided with the support tool, and the support tool is a plurality of support frames (8) or folding support frames (9). The plurality of support frames (8) and the folding support frames (9) each include a bottom frame (16) and a top frame (17). The bottom frame (16) is detachably connected to the vehicle frame (1). The bottom frame (16) is vertically arranged. The top frame (17) is horizontally arranged above the bottom frame (16). The middle of the top frame (17) is provided with a clamping groove (18) for positioning the arch. The distance between the two ends of the top frame (17) is adjustable. The end of the top frame (17) is also provided with a pressing assembly (21) for fixing the arch.

2. A tunnel arch transport apparatus according to claim 1, wherein, The engineering vehicle chassis (23) includes a vehicle frame (1), a hydraulic power station (2), drive wheels (3) controlled by the hydraulic power station (2), and hydraulic outriggers (4). The hydraulic power station (2) is arranged on one side of the front end of the vehicle frame (1). The front cab (5) is arranged on the other side of the front end of the vehicle frame (1). The crane (7) is arranged on the vehicle frame (1) between the front cab (5) and the hydraulic power station (2). The rear cab (6) is bolted to the rear end of the vehicle frame (1).

3. A tunnel arch conveyor as claimed in claim 2, wherein, Four drive wheels (3) are arranged below the vehicle frame (1). A static liquid transmission system is arranged between the drive wheels (3) and the hydraulic power station (2) for connection. Four hydraulic outriggers (4) are also arranged below the vehicle frame (1). The hydraulic outriggers (4) and the drive wheels (3) are in one-to-one correspondence.

4. The tunnel arch transport apparatus of claim 2, wherein, The crane (7) includes a rotating unit and a telescopic arm (12). The rotating unit is arranged on the vehicle frame (1). The rotating unit is driven by rotation. A rotating seat (11) is arranged above the rotating unit. The telescopic arm (12) is hingedly connected to the rotating seat (11). A luffing cylinder is arranged between the telescopic arm (12) and the rotating seat (11) to control the luffing of the telescopic arm (12).

5. A tunnel arch conveyor as claimed in claim 4, wherein, A collision rod (14) is arranged on the telescopic arm (12). The collision rod (14) extends downward from the telescopic arm (12). A limit switch (15) is arranged on the top of the front cab (5). The limit switch (15) is connected to the rotating unit. The collision rod (14) abuts against the limit switch (15).

6. The tunnel arch transport apparatus of claim 1, wherein, The bottom frame (16) includes a rectangular frame (161) welded by steel pipes and upright columns (162) arranged at the corners of the rectangular frame (161). The number of upright columns (162) is four. The upright columns (162) are vertically arranged. The upright columns (162) are bolted to the vehicle frame (1) downward. The upright columns (162) are upwardly extended and connected to the top frame (17).

7. A tunnel arch conveyor as claimed in claim 6, wherein, The top frame (17) is a "mouth" shaped frame structure welded by steel pipes, and a clamping arm (19) in "L" shape is movably arranged at the corner of the top frame (17), the horizontal end of the clamping arm (19) is inserted into the top frame (17) and is in sliding connection with the top frame (17), and a jacking screw (20) is further arranged at the corner of the top frame (17), the jacking screw (20) penetrates the top frame (17) and abuts against the clamping arm (19).

8. A tunnel arch conveyor as claimed in claim 7, wherein, The vertical end of the clamping arm (19) is provided with a pressing assembly (21), the pressing assembly (21) comprises a control lever (211) and a pressing cam (212) controlled by the control lever (211), the control lever (211) is in rotary connection with the clamping arm (19), one end of the control lever (211) is connected with the pressing cam (212) penetrating the clamping arm (19), and the pressing cam (212) extrudes the arch frame downward.

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