Suspension bridge catwalk bearing cable anchoring adjusting device

Abstract

The present application relates to a kind of catwalk bearing cable anchoring adjusting device of suspension bridge, belong to bridge construction technical field.The device includes square steel framework (16), guide component and adjusting component, the square steel framework (16) one end is hinged on the side wall of branch pier (1), the guide component is spaced apart on square steel framework (16), guide component includes two symmetrically arranged steel roller (9), steel roller (9) is vertically arranged on square steel framework (16), and rotationally connected with square steel framework (16), bearing cable (5) end portion passes through the gap between two steel roller (9) after being connected with adjusting component.This device can effectively shorten the construction period of bridge construction;Adjusting quickly in the process of use, greatly reduce the time and cost of manual adjustment.At the same time, bearing cable is anchored on different rotating shafts respectively, and the use process of catwalk is more firm and reliable.The existing large-span and large cable force suspension bridge catwalk bearing cable adjustment is more difficult, and the installation is inconvenient.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of catwalk bearing cable anchoring adjusting device of suspension bridge, belong to bridge construction technical field. BACKGROUND

[0002] Suspension bridge is widely used due to its large span capacity, strong anti-seismic ability and good topographic adaptability, wherein, conventional ground anchor type suspension bridge needs to build large anchor stock to anchor main cable, in the case of poor geology, the foundation engineering quantity of anchor stock structure is very huge, catwalk is important air walkway and work platform of suspension bridge superstructure construction, for main cable strand dragging erection, measurement, cable adjustment, main cable tight cable, installation cable clamp, sling, main cable wire winding and protective coating etc., according to the mode of catwalk bearing cable anchoring, catwalk can be divided into continuous type and separated type.

[0003] Generally, when the cable force of small-span suspension bridge catwalk bearing cable is small, it can be pulled to the design position by hand-operated hoist, and the hand-operated hoist adjustment is suitable for small-span suspension bridge, which has small span, small cable force and easy adjustment, but it is not suitable for the working condition of large cable force and internal stress monitoring and automatic adjustment of bearing cable, and the installation of catwalk bearing cable between the pier is more complicated and not easy to install. SUMMARY

[0004] The technical problem to be solved by the present application is that the adjustment of catwalk bearing cable of existing large-span and large-cable-force suspension bridge is difficult and inconvenient to install.

[0005] The technical scheme adopted by the present application to solve the technical problem is: a catwalk bearing cable anchoring adjusting device of suspension bridge, comprising a square steel framework, a guide assembly and an adjusting assembly, one end of the square steel framework is hinged to the side wall of the pier, the guide assembly is arranged on the square steel framework, the guide assembly comprises two symmetrically arranged steel rollers, the steel rollers are vertically arranged on the square steel framework and are rotatably connected to the square steel framework, and the end of the bearing cable passes through the gap between the two steel rollers and is connected to the adjusting assembly.

[0006] In the above device, the adjusting assembly comprises a rotating shaft and a hydraulic telescopic arm, the rotating shaft is rotatably arranged on the pier, the upper end of the rotating shaft is provided with an anchor block, the upper end of the rotating shaft is provided with a cable passing hole, the bearing cable passes through the cable passing hole and is connected to the anchor block, and the hydraulic telescopic arm can drive the rotating shaft to rotate.

[0007] Further, the lower end of the rotating shaft is provided with a transmission gear, the telescopic end of the hydraulic telescopic arm is connected with a transmission rack, and the transmission gear is engaged with the transmission rack.

[0008] Further, the device further comprises an electric push rod and an arc-shaped limiting tooth, the arc-shaped limiting tooth is matched with the transmission gear, and one end of the electric push rod is connected with the arc-shaped limiting tooth and can push the arc-shaped limiting tooth to engage with the transmission gear.

[0009] Further, the device further comprises a steel casing, one side of the steel casing is open and is embedded in the buttress on the side of the rotating shaft, the hydraulic telescopic arm is arranged in the steel casing, the cylinder body is threadedly connected with the inner wall of the steel casing, the transmission rack is connected with the transmission gear along the opening of the steel casing, and the end of the steel casing is sealed, the inner wall is provided with an elastic element, and the end of the elastic element away from the inner wall of the steel casing is connected with the transmission rack end of the extension end of the hydraulic telescopic arm.

[0010] The device further comprises an adjusting rope and a safety rope, one end of the adjusting rope and the safety rope is connected with the Y-shaped joint, the other end of the adjusting rope is connected with the anchor block after passing through the rope hole, and the other end of the safety rope is connected with the buttress.

[0011] Further, the ends of the adjusting rope and the safety rope are provided with straight rod type rope heads, and through holes are reserved on the Y-shaped joint, so that the straight rod type rope heads are connected with the Y-shaped joint through a bolt.

[0012] Further, the device further comprises a self-tightening sleeve, the end of the bearing rope is provided with a conical stop block, the self-tightening sleeve comprises a stress bending arm at a fastening end and a toothed washer, the conical stop block is arranged in the stress bending arm, the penetrating end is arranged on the toothed washer, and the fastening end is connected with the Y-shaped joint.

[0013] Further, the rotating shaft is arranged at a spreader bar mounting area of the buttress, and a rope stress display electrically connected with the hydraulic telescopic arm is arranged at the lower end of the spreader bar mounting area.

[0014] The device further comprises spaced connection arms, the upper layer of the square steel framework is a V-shaped structure, the lower layer is a support beam, and the upper and lower layers are connected into an integrated whole through vertical connecting rods, the connection arms are triangular structures and are spaced in the square steel framework, the lower end of the connection arm is connected with the support beam of the lower layer of the square steel framework, and the upper end is rotationally connected with the steel roller.

[0015] The device has the advantages that: 1. The device is convenient and fast to install and operate, the anchoring construction of the catwalk is advanced, and the construction period of the bridge construction can be effectively shortened; the adjustment is rapid during use, and the time and cost of manual adjustment are greatly reduced.

[0016] 2. The bearing rope can be anchored on different rotating shafts by using the device, the use process of the catwalk is more firm and reliable, the bearing rope of the catwalk has large force, manual adjustment is prone to safety accidents, the hydraulic telescopic arm is electrically connected with the rope stress display to realize automatic adjustment, and the construction process is more intelligent and safe.

[0017] 3、catwalk bearing cable and catwalk overall linear adjustment is convenient, construction control is easy to realize, and the influence of catwalk unbalanced horizontal force on cable tower is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Structure diagram of the present application.

[0019] Figure 2 Structure diagram of the present application Figure 1 Structure diagram of the present application.

[0020] Figure 3 Structure diagram of the present application Figure 2 Structure diagram of the present application.

[0021] Figure 4 Structure diagram of the present application Figure 1 Structure diagram of the present application.

[0022] Figure 5 Structure diagram of the present application Figure 2 Structure diagram of the present application.

[0023] In the figure, the marks are: 1, support pier; 2, rotating shaft; 3, cable passing hole; 4, anchor block; 5, bearing cable; 501, conical stop block; 6, cable spreading saddle installation area; 7, cable stress display; 8, cable stress adjusting button; 9, steel roller; 10, upper connecting rod; 11, lower connecting rod; 12, upper rotating shaft; 13, lower rotating shaft; 14, connecting arm; 1401, transverse connecting rod; 15, vertical connecting rod; 16, square steel framework; 17, self-tightening sleeve; 1701, toothed washer; 1702, stress bending arm; 1703, fastening end; 18, Y-shaped joint; 19, straight bar type cable head; 20, safety cable; 21, pre-buried steel anchor; 22, hydraulic telescopic arm; 23, transmission rack; 24, transmission gear; 25, elastic member; 26, arc-shaped limiting tooth; 27, electric push rod; 28, steel casing; 29, threaded nipple; 30, signal transmission line; 31, hinged fixed shaft; 32, adjusting cable; 33, motor. DETAILED DESCRIPTION

[0024] The present application is further described below in combination with the drawings.

[0025] As Figures 1 to 5As shown, the catwalk bearing cable anchoring adjusting device of the suspension bridge of the present application comprises a square steel framework 16, a guide assembly and an adjusting assembly. One end of the square steel framework 16 is hingedly connected to the side wall of the support pier 1. The guide assembly is arranged at intervals on the square steel framework 16. The guide assembly comprises two symmetrically arranged steel rollers 9. The steel rollers 9 are vertically arranged on the square steel framework 16 and are rotationally connected to the square steel framework 16. The end of the bearing cable 5 passes through the gap between the two steel rollers 9 and is connected to the adjusting assembly. Those skilled in the art can understand that in the device, one end of the square steel framework 16 is hingedly connected to the side wall of the support pier 1 to realize the displacement of the bearing cable 5. Specifically, a hinged fixed shaft 31 can be arranged at the front end of the support pier 1. The support pier 1 is hingedly connected to the square steel framework 16 through the hinged fixed shaft 31. The structure of the square steel framework 16 can be changed according to the number of bearing cables 5, as long as the bearing cables 5 are symmetrically arranged. The guide assembly is arranged at intervals on the square steel framework 16. Preferably, the guide assembly is symmetrically arranged. The guide assembly comprises two symmetrically arranged steel rollers 9. The steel rollers 9 are vertically arranged on the square steel framework 16 and are rotationally connected to the square steel framework 16. In fact, the bearing cable 5 is displaced by passing through the two steel rollers 9. The end of the bearing cable 5 passes through the gap between the two steel rollers 9 and is connected to the adjusting assembly. In fact, the adjusting assembly can automatically adjust according to the tension of the bearing cable 5. The symmetrically arranged steel rollers 9 can rotate slightly around the vertical rotating shaft 2 to offset the crosswind shear force.

[0026] Preferably, in the above device, the adjusting assembly comprises a rotating shaft 2 and a hydraulic telescopic arm 22. The rotating shaft 2 is rotationally arranged on the support pier 1. An anchor block 4 is arranged at the upper end of the rotating shaft 2. A cable passing hole 3 is arranged at the upper end of the rotating shaft 2. The bearing cable 5 passes through the cable passing hole 3 and is connected to the anchor block 4. The hydraulic telescopic arm 22 can drive the rotating shaft 2 to rotate. Those skilled in the art can understand that in the device, the adjusting assembly preferably comprises a rotating shaft 2 and a hydraulic telescopic arm 22. Specifically, the rotating shaft 2 is rotationally arranged on the support pier 1. The number of rotating shafts 2 corresponds to the number of bearing cables 5. In order to facilitate the fixation of the bearing cable 5, an anchor block 4 is arranged on the outer wall of the rotating shaft 2. In fact, an anchor block 4 clamping groove is arranged at the upper end of the rotating shaft 2 for connecting with the bearing cable 5. A cable passing hole 3 is arranged at the upper end of the rotating shaft 2, so that the bearing cable 5 passes through the cable passing hole 3 and is connected to the anchor block 4. The rotation of the rotating shaft 2 can be controlled to adjust the bearing cable 5. Further, the hydraulic telescopic arm 22 can drive the rotating shaft 2 to rotate. The arrangement of the hydraulic telescopic arm 22 enables the adjusting assembly of the device to be automatically controlled. Specifically, eight telescopic rotating shafts 2 can be wrapped around the support pier 1. The upper end of the telescopic rotating shaft 2 is a cable passing hole 3. The bearing cable 5 is connected and fixed to the anchor block 4 through the cable passing hole 3, so that the bearing cable 5 cannot be retracted. When the telescopic rotating shaft 2 rotates, the bearing cable 5 is wound thereon to adjust the length of the cable and the internal stress.

[0027] Preferably, the lower end of the rotating shaft 2 is sleeved with a transmission gear 24, the telescopic end of the hydraulic telescopic arm 22 is connected with a transmission rack 23, and the transmission gear 24 is engaged with the transmission rack 23. Those skilled in the art can understand that, in order to facilitate the control of the rotation of the rotating shaft 2, the lower end of the rotating shaft 2 is preferably sleeved with a transmission gear 24, the telescopic end of the hydraulic telescopic arm 22 is connected with a transmission rack 23, and the transmission gear 24 is engaged with the transmission rack 23. This structure makes the transmission rack 23 drive the transmission gear 24 at the bottom of the rotating shaft 2 through axial displacement, so that the rotating shaft 2 rotates clockwise or counterclockwise, so as to achieve the purpose of adjusting the cable force of the bearing cable 5.

[0028] Preferably, the device further comprises an electric push rod 27 and an arc-shaped limiting tooth 26, the arc-shaped limiting tooth 26 is matched with the transmission gear 24, one end of the electric push rod 27 is connected with the arc-shaped limiting tooth 26, and the arc-shaped limiting tooth 26 can be pushed to engage with the transmission gear 24. Those skilled in the art can understand that, in order to ensure the stability of the cable force of the bearing cable 5, the device preferably prevents the rotation of the transmission gear 24 by engaging the arc-shaped limiting tooth 26 with the transmission gear 24. Specifically, when the transmission rack 23 stops moving, the electric motor 33 is immediately triggered to make the electric push rod 27 axially displace, and the top of the electric push rod 27 has a rubber-coated steel arc-shaped limiting tooth 26 which can be clamped into the tooth groove of the transmission gear 24 to limit the rotation thereof; similarly, 2 seconds before the transmission rack 23 moves, the electric motor 33 is immediately triggered to make the electric push rod 27 retract, so as to release the limitation on the transmission gear 24. The electric push rod 27 can be electrically connected with the hydraulic telescopic arm 22. Preferably, the electric push rod 27 and the arc-shaped limiting tooth 26 are one-to-one corresponding, and several groups of electric push rods 27 and arc-shaped limiting teeth 26 can be set according to the size of the transmission gear 24, and can be telescoped synchronously.

[0029] Preferably, the above-mentioned device further includes a steel casing 28, which has an opening on one side and is pre-embedded in the support 1 on the side of the rotating shaft 2. The hydraulic telescopic arm 22 passes through the steel casing 28, and the cylinder body is threadedly connected to the inner wall of the steel casing 28. The transmission rack 23 is connected to the transmission gear 24 along the opening of the steel casing 28. The end of the steel casing 28 is sealed, and an elastic element 25 is provided on the inner wall. The end of the elastic element 25 away from the inner wall of the steel casing 28 is connected to the end of the transmission rack 23 at the extended end of the hydraulic telescopic arm 22. Those skilled in the art will understand that in this device, a steel casing 28 is pre-embedded in the support 1, and the hydraulic telescopic arm 22 is fixed to the steel casing 28 by spirally engaging the threaded end 29. The front section of the hydraulic telescopic arm 22 is a transmission rack 23, and the top end of the transmission rack 23 is connected to the steel casing 28 through an elastic element 25, which plays a certain buffering role during extension and retraction. The transmission rack 23 drives the transmission gear 24 at the bottom of the rotating shaft 2 through axial displacement, causing the rotating shaft 2 to rotate clockwise or counterclockwise, thereby adjusting the cable force of the load-bearing cable 5. To reduce manufacturing costs, the elastic element 25 can preferably be a tubular spring structure, with one end connected to the inner bottom surface of the steel casing 28 and the other end connected to the end of the transmission rack 23.

[0030] Preferably, the above-mentioned device further includes an adjusting cable 32 and a safety cable 20. The end of the load-bearing cable 5 is connected to a Y-type connector 18. One end of the adjusting cable 32 and the safety cable 20 are respectively connected to the Y-type connector 18. The other end of the adjusting cable 32 passes through the cable-passing hole 3 and is connected to the anchor block 4. The other end of the safety cable 20 is connected to the support pier 1. Those skilled in the art will understand that the device, with the Y-type connector 18 at the end of the load-bearing cable 5 and one end of the adjusting cable 32 and the safety cable 20 respectively connected to the Y-type connector 18, effectively connects the load-bearing cable 5 to the adjusting cable 32 and the safety cable 20 via the Y-type connector 18. When the adjusting cable 32 is working, it bears the majority of the cable force, while the safety cable 20 bears only a small component of the force. When the adjusting cable 32 breaks or the system malfunctions, the safety cable 20 will limit the displacement of the load-bearing cable 5, ensuring timely repair by engineers. The other end of the safety cable 20 is connected to the support 1. In practice, it is preferable to pre-embed the steel anchor 21 during the pouring of the support 1. The other end of the safety cable 20 is connected to the pre-embedded steel anchor 21 to transfer the cable tension to the support 1.

[0031] Preferably, in the above-mentioned device, both the adjusting cable 32 and the safety cable 20 are provided with straight rod-type cable heads 19 at their ends, and the Y-type connector 18 has a pre-drilled through hole, so that the straight rod-type cable heads 19 can be connected to the Y-type connector 18 through a pin. Those skilled in the art will understand that, for ease of connection, this device preferably has two pre-drilled round holes on the Y-type connector 18, and the straight rod-type cable heads 19 provided at the ends of both the adjusting cable 32 and the safety cable 20 can be connected to the Y-type connector 18 through a pin, and the safety cable 20 and the adjusting cable 32 counteract the cable force when adjusting the load-bearing cable 5 through the straight rod-type cable heads 19.

[0032] Preferably, the above-mentioned device further includes a self-tightening sleeve 17. The end of the load-bearing cable 5 is provided with a conical stop 501. The self-tightening sleeve 17 includes a fastening end 1703, a stress-bending arm 1702 and a toothed washer 1701. The conical stop 501 is placed inside the stress-bending arm 1702, and the protruding end is inserted through the toothed washer 1701. The fastening end 1703 is connected to the Y-type connector 18. Those skilled in the art will understand that, since this device is a multi-cable connection device, it preferably also includes a self-tightening sleeve 17. The self-tightening sleeve 17 is divided into a fastening end 1703, a stress bending arm 1702, and a toothed washer 1701. The self-tightening sleeve 17 wraps around the load-bearing cable 5 and its end conical stop 501. When the stress bending arm 1702 is subjected to the reverse force of the conical stop 501, the toothed washer 1701 bites inward and becomes more secure with the load-bearing cable 5, thereby achieving a connection and fixation between the load-bearing cable 5 and the self-tightening sleeve 17. Preferably, the fastening end 1703 is threadedly connected to the Y-type connector 18 to form an integral whole.

[0033] Preferably, the rotating shaft 2 in the above-mentioned device is located at the cable saddle installation area 6 of the support 1, and a cable stress display 7 electrically connected to the hydraulic telescopic arm 22 is provided at the lower end of the cable saddle installation area 6. Those skilled in the art will understand that this device preferably arranges the rotating shaft 2 around the cable saddle installation area 6, and the cable stress display 7 is provided at the lower part of the cable saddle installation area 6. The cable stress display 7 is connected to the hydraulic telescopic arm 22 via a signal transmission line 30, monitors the maximum thrust of the hydraulic telescopic arm 22 (thrust = torque = cable force) and converts it into cable internal stress; preferably, there are 8 load-bearing cables 5 arranged symmetrically at intervals, and the cable stress display 7 displays the stress of two symmetrical cables from the outside to the inside of the load-bearing cables 5 from left to right. Preferably, the cable stress display 7 is controlled by a cable stress adjustment button 8 provided on the support 1, or it can be remotely controlled. When the stresses of the two symmetrical cables are not equal, the cable stress can be increased or decreased within a reasonable range by clicking the cable stress adjustment button 8 connected to the cable stress display 7 to rotate the telescopic rotating shaft 2 clockwise or counterclockwise.

[0034] Preferably, the above-mentioned device further includes connecting arms 14 spaced apart. The upper layer of the square steel frame 16 has a V-shaped structure, and the lower layer has a support beam. The upper and lower layers are connected as one unit by vertical connecting rods 15. The connecting arms 14 have a triangular structure and are spaced apart inside the square steel frame 16. The lower end of the connecting arm 14 is connected to the lower support beam of the square steel frame 16, and the upper end is rotatably connected to the steel roller 9. Those skilled in the art will understand that the load-bearing cable 5 of this device passes through the steel rollers 9 on both sides to achieve displacement, and the steel rollers 9 are rotatably mounted on the square steel frame 16. In order to facilitate the installation of the steel rollers 9, this device preferably has a connecting arm 14 connected to the square steel frame 16. An upper connecting rod 10 and a lower connecting rod 11 are provided between the square steel frame 16 and the connecting arm 14, and the steel rollers 9 are fixedly installed between the upper connecting rod 10 and the lower connecting rod 11. The upper connecting rod 10 is connected to the square steel frame 16 through an upper rotating shaft 12, and the lower connecting rod 11 is connected to the upper end of the connecting arm 14 through a lower rotating shaft 13. The connecting arm 14 has a triangular structure. In practice, it is preferred to weld the V-shaped body to form a triangular reinforcement system through the horizontal connecting rod 1401, and the bottom of the connecting arm 14 is welded to the lower square steel frame 16 to form an integral whole. In order to ensure the structural strength of the square steel frame 16, it is preferred that the upper and lower square steel frames 16 are connected into one piece through the vertical connecting rod 15.

Claims

1. A suspension bridge catwalk cable anchorage adjustment device, characterized in that: The system includes a square steel frame (16), a guide assembly, and an adjustment assembly. One end of the square steel frame (16) is hinged to the side wall of the support (1). The guide assembly is spaced apart on the square steel frame (16) and includes two symmetrically arranged steel rollers (9). The steel rollers (9) are vertically arranged on the square steel frame (16) and rotatably connected to the square steel frame (16). The end of the load-bearing cable (5) passes through the gap between the two steel rollers (9) and is connected to the adjustment assembly. The adjustment assembly includes a rotating shaft (2) and a hydraulic telescopic arm (2). 2) The rotating shaft (2) is rotatably mounted on the support (1). An anchor block (4) is provided at the upper end of the rotating shaft (2). A cable hole (3) is provided at the upper end of the rotating shaft (2). The load-bearing cable (5) passes through the cable hole (3) and is connected to the anchor block (4). The hydraulic telescopic arm (22) can drive the rotating shaft (2) to rotate. A transmission gear (24) is sleeved at the lower end of the rotating shaft (2). A transmission rack (23) is connected to the telescopic end of the hydraulic telescopic arm (22), and the transmission gear (24) meshes with the transmission rack (23).

2. The suspension bridge catwalk anchorage adjustment device according to claim 1, characterized in that: It also includes an electric push rod (27) and an arc-shaped limiting tooth (26), the arc-shaped limiting tooth (26) being adapted to the transmission gear (24), and one end of the electric push rod (27) being connected to the arc-shaped limiting tooth (26), and being able to push the arc-shaped limiting tooth (26) to mesh with the transmission gear (24).

3. The suspension bridge catwalk anchorage adjustment device according to claim 1, characterized in that: It also includes a steel casing (28), which has an opening on one side and is embedded in a support (1) on the side of the rotating shaft (2). The hydraulic telescopic arm (22) is inserted inside the steel casing (28), and the cylinder is threaded to the inner wall of the steel casing (28). The transmission rack (23) is connected to the transmission gear (24) along the opening of the steel casing (28). The end of the steel casing (28) is sealed, and an elastic element (25) is provided on the inner wall. The end of the elastic element (25) away from the inner wall of the steel casing (28) is connected to the end of the transmission rack (23) at the extended end of the hydraulic telescopic arm (22).

4. The suspension bridge catwalk anchorage adjustment device according to claim 1, characterized in that: It also includes an adjusting cable (32) and a safety cable (20). The end of the load-bearing cable (5) is connected to a Y-type connector (18). One end of the adjusting cable (32) and the safety cable (20) are respectively connected to the Y-type connector (18). The other end of the adjusting cable (32) passes through the cable hole (3) and is connected to the anchor block (4). The other end of the safety cable (20) is connected to the support pier (1).

5. The suspension bridge catwalk anchorage adjustment device according to claim 4, characterized in that: Both the adjusting cable (32) and the safety cable (20) are provided with straight rod cable heads (19) at their ends. The Y-type connector (18) has a reserved through hole, so that the straight rod cable head (19) is connected to the Y-type connector (18) through a pin.

6. The suspension bridge catwalk anchorage adjustment device according to claim 4, characterized in that: It also includes a self-tightening sleeve (17), and the end of the load-bearing cable (5) is provided with a conical stop (501). The self-tightening sleeve (17) includes a fastening end (1703), a stress-flexing arm (1702) and a toothed gasket (1701). The conical stop (501) is placed inside the stress-flexing arm (1702), and the protruding end is inserted on the toothed gasket (1701). The fastening end (1703) is connected to the Y-type connector (18).

7. The suspension bridge catwalk anchorage adjustment device according to claim 1, characterized in that: The rotating shaft (2) is located at the cable saddle installation area (6) of the support (1), and a cable stress display (7) electrically connected to the hydraulic telescopic arm (22) is provided at the lower end of the cable saddle installation area (6).

8. The suspension bridge catwalk anchorage adjustment device according to claim 1, characterized in that: It also includes connecting arms (14) spaced apart. The upper layer of the square steel frame (16) is a V-shaped structure, and the lower layer is a support beam. The upper and lower layers are connected as one unit by vertical connecting rods (15). The connecting arms (14) are triangular structures and are spaced apart inside the square steel frame (16). The lower end of the connecting arm (14) is connected to the lower support beam of the square steel frame (16), and the upper end is rotatably connected to the steel roller (9).

Images