Pipe hanger with anti-falling function

Abstract

The present invention relates to the field of pipeline hoisting, and in particular to a pipeline hanger with an anti-slip function, including a hoisting frame, etc. The pipeline hanger with an anti-slip function of the present invention is controlled by electric chain reels on both sides of the hoisting frame to control the claw hooks on the anti-slip chain to hook the strapping belts at both ends of the bundled pipeline bundle respectively. At the same time, the staff will pass the anti-slip strap released from the first strap electric reel around the lower middle part of the bundled pipeline bundle, and tighten it upward in the second strap electric reel, so that the middle part of the bundled pipeline bundle is firmly tightened on the hoisting frame. An arc-shaped guide plate is also provided to actively pass the released anti-slip strap around the lower middle part of the bundled pipeline bundle. During the entire hoisting operation, the arc-shaped guide plate can also provide anti-slip support protection; it solves the technical problem that the hooks on the hanger hook the strapping belts at both ends of the bundled steel pipe bundle for hoisting, which easily leads to natural bending and sagging deformation in the middle of the steel pipe and the dangerous phenomenon of loosening and sliding.

Description

Technical Field

[0001] The present invention relates to the field of pipeline hoisting, and in particular to a pipeline hanger with an anti-falling function. Background Art

[0002] Steel pipe lifting is a complex task involving safety regulations, mechanical calculations and operating procedures, and requires strict adherence to technical requirements and safety measures. When lifting bundles of bundled steel pipes, the hooks on the hanger are used to hook the straps at both ends of the bundled steel pipes before subsequent lifting. During this process, when the steel pipe is long, the middle part of the steel pipe naturally bends downward. If the steel pipe maintains this naturally bent downward state and is frequently lifted and transferred, it is easy to cause local bending deformation of the steel pipe, destroying the straight structural integrity of the steel pipe. In addition, the natural bending of the steel pipe will affect the firmness of the bundled steel pipe bundle, resulting in the dangerous phenomenon of some steel pipes loosening and sliding downward from the straps of the bundled steel pipe bundle. Summary of the Invention

[0003] In order to overcome the disadvantage that the hooks on the hanger hook the straps at both ends of the bundled steel pipe bundle to perform lifting work, which easily causes natural bending and sagging deformation in the middle of the steel pipe and the dangerous phenomenon of loosening and sliding, the present invention provides a pipe hanger with an anti-slip function.

[0004] The technical implementation scheme of the present invention is as follows: a pipe hanger with an anti-slip function, comprising a hanging frame, an electric-controlled chain reel, an anti-slip chain, a claw hook, a first strap electric-controlled reel, an anti-slip strap, a second strap electric-controlled reel, an arc-shaped guide plate, an arc-shaped rack, a self-locking motor and a gear; an electric-controlled chain reel is installed on the left and right sides of the hanging frame; an anti-slip chain is wound around the electric-controlled chain reel; one end of the anti-slip chain is fixedly connected to a hook for hooking the strap The hook of the pipe bundle's strapping tape; the hoisting frame is equipped with a first electrically controlled strap retractor; the first electrically controlled strap retractor is wound with an anti-slip strap for tightening the middle part of the pipe bundle; the hoisting frame is equipped with a second electrically controlled strap retractor for tightening the anti-slip strap; an arc-shaped guide plate is slidably connected to the hoisting frame; an arc-shaped rack is fixedly connected to the arc-shaped guide plate; a self-locking motor is installed on the hoisting frame; the output shafts of the self-locking motors are each fixedly connected to a gear; the gear is meshed with the arc-shaped rack.

[0005] More preferably, the hanging frame is provided with two fixing plates; the fixing plates are provided with limiting cylinders corresponding to the number and positions of the anti-drop chains.

[0006] More preferably, the fixing plate is slidably connected to the hanging frame; and an adjusting bolt is fixed between the fixing plate and the hanging frame.

[0007] More preferably, the second strap electric retractor is equipped with a tension monitoring module for monitoring the tension of the anti-slip strap; a tightening indicator light is installed on the second strap electric retractor, and the tightening indicator light is connected to the tension monitoring module built into the second strap electric retractor through a circuit.

[0008] More preferably, the arc guide plate is composed of a main arc guide plate and a secondary arc guide plate; the main arc guide plate is slidably connected to the lifting frame; the main arc guide plate is fixed to the arc rack; a slide rod is fixed to the main arc guide plate; and the secondary arc guide plate is slidably connected to the slide rod.

[0009] More preferably, the surface of the secondary arc-shaped guide plate is provided with an anti-skid rubber layer for preventing the steel pipe from slipping; the anti-skid rubber layer on the surface of the secondary arc-shaped guide plate is provided with a plurality of anti-skid convex block structures for enhancing the anti-skid effect.

[0010] More preferably, a limiting strip is fixedly connected to the left side and the right side of the main arc-shaped guide plate.

[0011] More preferably, a pressure rod is rotatably connected to the claw hook; a torsion spring is fixed between the pressure rod and the corresponding claw hook; and an anti-slip pad is fixed to the pressure rod.

[0012] More preferably, the lower end of the secondary arc-shaped guide plate is provided with a wedge-shaped inclined surface structure.

[0013] More preferably, a plurality of rollers are rotatably connected to the secondary arc-shaped guide plate.

[0014] Compared with the prior art, the present invention has the following advantages: the pipe hanger with anti-slip function of the present invention controls the claw hooks on the anti-slip chain by the electric-controlled chain reelers on both sides of the hanging frame to hook the strapping belts at both ends of the bundled pipe bundle respectively, and at the same time, the staff will pass the anti-slip strap released from the first strap electric-controlled reel around the lower middle part of the bundled pipe bundle and tighten it upward in the second strap electric-controlled reel, so that the middle part of the bundled pipe bundle is firmly tightened on the hanging frame, which can not only avoid the natural bending and sagging phenomenon in the middle part of the bundled pipe bundle, but also avoid the bundled pipe bundle from accidentally falling. In order to prevent the pipe bundle from falling off, an arc-shaped guide plate is provided to actively guide the released anti-slip strap around the lower middle part of the bundled pipe bundle. There is no need for workers to stand directly under the bundled pipe bundle to pull the released anti-slip strap forward, reducing the risk of the bundled pipe bundle injuring workers due to accidental falling off. In the entire lifting operation, the arc-shaped guide plate can also serve as a bottom protection support component to provide anti-slip support protection for the bundled pipe bundle. This solves the technical problem that the hook on the hanger hooks the straps at both ends of the bundled steel pipe bundle for lifting, which easily leads to natural bending and sagging deformation in the middle of the steel pipe and the dangerous phenomenon of loosening and sliding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of a pipe hanger with an anti-drop function;

[0016] Figure 2 A three-dimensional diagram of an electric-controlled chain retractor for a pipe hanger with an anti-slip function;

[0017] Figure 3 A three-dimensional diagram of an arc-shaped guide plate of a pipe hanger with an anti-drop function;

[0018] Figure 4 A three-dimensional diagram of an electrically controlled retractor for the first strap of a pipe hanger with an anti-slip function;

[0019] Figure 5 A three-dimensional diagram of an electrically controlled retractor for the second strap of a pipe hanger with an anti-slip function;

[0020] Figure 6 A three-dimensional diagram of the initial state of a curved guide plate of a pipe hanger with an anti-drop function;

[0021] Figure 7 A three-dimensional diagram of a sliding rod of a pipe hanger with an anti-slip function;

[0022] Figure 8 A three-dimensional diagram of a claw hook of a pipe hanger with an anti-drop function;

[0023] Figure 9 A three-dimensional diagram of a pipe hanger with an anti-drop function showing the arc-shaped guide plate in the lowered state;

[0024] Figure 10 This is a three-dimensional diagram of the expanded state of the arc-shaped guide plate of a pipe hanger with an anti-slip function.

[0025] The above drawings include the following figure marks: 1-hoisting frame, 11-fixed plate, 12-adjusting bolt, 21-electrically controlled chain reel, 22-anti-slip chain, 23-claw hook, 231-pressure rod, 232-torsion spring, 233-anti-slip pad, 24-limiting cylinder, 31-first strap electric reel, 32-anti-slip strap, 33-second strap electric reel, 34-tightening indicator light, 4-arc guide plate, 41-main arc guide plate, 411-sliding rod, 42-secondary arc guide plate, 420-wedge-shaped inclined surface structure, 421-anti-slip bump structure, 422-roller, 43-arc rack, 44-self-locking motor, 45-gear, 46-limiting bar, 5-bundling pipe bundle. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example 1

[0028] The present invention provides a pipe hanger with an anti-falling function, such as Figures 1-10 As shown, it includes a hoisting frame 1, an electric chain reel 21, an anti-slip chain 22, a claw hook 23, a first strap electric reel 31, an anti-slip strap 32, a second strap electric reel 33, an arc guide plate 4, an arc rack 43, a self-locking motor 44 and a gear 45; four sets of electric chain reels 21 are installed on the left and right sides of the hoisting frame 1; an anti-slip chain 22 is wound around each of the electric chain reels 21; each anti-slip chain 22 is fixedly connected to a claw at one end released from the electric chain reel 21 Hook 23; a first electrically controlled strap retractor 31 is installed on the rear side of the lifting frame 1; an anti-slip strap 32 is wound inside the first electrically controlled strap retractor 31; a second electrically controlled strap retractor 33 is installed on the front side of the lifting frame 1; an arc-shaped guide plate 4 is slidably connected to the lifting frame 1; two arc-shaped racks 43 that are symmetrical to each other are fixedly connected to the arc-shaped guide plate 4; two self-locking motors 44 are installed on the lifting frame 1; the output shafts of the two self-locking motors 44 are each fixedly connected to a gear 45; the two gears 45 are respectively engaged with an arc-shaped rack 43.

[0029] The following are the working steps of a pipe hanger with an anti-slip function of the present invention.

[0030] First, the staff controls the lifting frame 1 to move above the bundled pipe bundle 5 to be lifted through the external lifting equipment, and then controls the electric chain reels 21 on both sides of the lifting frame 1 to release the anti-slip chains 22 and claw hooks 23 connected thereto. After the claw hooks 23 on both sides of the lifting frame 1 respectively hook the strapping tapes at both ends of the bundled pipe bundle 5, the staff controls the electric chain reels 21 on both sides to tighten the anti-slip chains 22 connected thereto in the reverse direction, allowing the claw hooks 23 to firmly hook the corresponding strapping tapes in the bundled pipe bundle 5. Then, the staff controls the external lifting equipment to drive the lifting frame 1 to move slowly upward to enter the trial lifting stage, allowing the lifting frame 1 to lift the bundled pipe bundle 5 upward to the lowest point through the claw hooks 23 at a height of 15cm-30cm from the ground. At this time, the strapping tapes at both ends of the bundled pipe bundle 5 are respectively hooked by the claw hooks 23 on both sides. When the bundled pipe bundle 5 is long, there is an obvious downward bending phenomenon in the middle part of the bundled pipe bundle 5.

[0031] After that, the staff controls the self-locking motor 44 to drive the gear 45 to rotate, and the gear 45 engages the arc-shaped rack 43 to drive the arc-shaped guide plate 4 to move backward and downward. Figure 9As shown, until the arc-shaped guide plate 4 wraps the rear side and the lower side of the bundled pipe bundle 5, the staff then controls the first strap electric-controlled reel 31 to release the anti-slip strap 32 rearward and downward, and the released anti-slip strap 32 will go around the rear and lower side of the bundled pipe along the smooth surface of the arc-shaped guide plate 4 and extend forward. When each pipe of the bundled pipe bundle 5 being hoisted is a large-sized pipe with a diameter exceeding 100mm, the front-to-back width of the entire bundled pipe bundle 5 will exceed 200mm, and the arc-shaped guide plate 4 replaces the manual release of the anti-slip strap 3 2 is extended forward for guidance, so the staff does not need to drill under the large-sized bundled pipe bundle 5 to pull the released anti-slip band 32 forward, reducing the risk of the bundled pipe bundle 5 accidentally falling off and injuring the staff. Then the staff manually pulls the anti-slip band 32 upward into the second band electric-controlled reel 33, and the second band electric-controlled reel 33 tightens the anti-slip band 32, so that the middle part of the bundled pipe bundle 5 is firmly tightened on the hanging frame 1 by the anti-slip band 32, completing the anti-slip binding work of the bundled pipe bundle 5.

[0032] Afterwards, the staff controls the external lifting equipment to drive the lifting frame 1 to slowly move upward to enter the lifting stage, and lifts the bundled pipe bundle 5 to the target position. During this process, the arc-shaped guide plate 4 remains below the bundled pipe bundle 5, and the arc-shaped guide plate 4 provides anti-fall-off support protection for the bundled pipe bundle 5.

[0033] like Figure 1 and Figure 2 As shown, in this embodiment, two mutually symmetrical fixed plates 11 are slidably connected to the hanging frame 1; three adjusting bolts 12 are fixedly connected between the two fixing plates 11 and the hanging frame 1; the two fixing plates 11 are respectively provided with limiting cylinders 24 corresponding to the number and position of the anti-detachment chains 22, and the anti-detachment chains 22 respectively pass through the corresponding limiting cylinders 24. When the staff controls the electric chain reel 21 on both sides of the hanging frame 1 to retract and extend the anti-detachment chains 22 and claw hooks 23 connected thereto, the limiting cylinders 24 guide the retraction and extension direction of the anti-detachment chains 22; by disassembling and assembling the adjusting bolts 12, the fixing plate 11 can be driven to slide along the hanging frame 1, and the pull-out length of the fixing plate 11 can be adjusted according to the length of the bundled pipe bundle 5, so that the electric chain reel 21 is closer to the bundling area of the bundled pipe bundle 5.

[0034] like Figure 5As shown, in this embodiment, the second strap electric retractor 33 is equipped with a tension monitoring module; a tightening indicator light 34 is installed on the second strap electric retractor 33, and the tightening indicator light 34 is electrically connected to the tension monitoring module built into the second strap electric retractor 33 through a circuit system; when the staff pulls out the anti-slip strap 32 in the first strap electric retractor 31, wraps it under the bundled pipe bundle 5 and tightens it in the second strap electric retractor 33, the tension monitoring module built into the second strap electric retractor 33 continuously monitors the winding tension of the wound anti-slip strap 32. When the tension monitoring module detects that the winding tension of the anti-slip strap 32 reaches the target value, it indicates that the bundled pipe bundle 5 has been tightened by the anti-slip strap 32. At this time, the tension monitoring module sends a start signal to the tightening indicator light 34 through the circuit system, and the tightening indicator light 34 sends an indicator light to show the staff that the bundled pipe bundle 5 has been tightened by the anti-slip strap 32.

[0035] Example 2

[0036] like Figure 1-Figure 3 、 Figure 6 and Figure 7 As shown, based on Example 1, the arc guide plate 4 of this embodiment is composed of a main arc guide plate 41 and a secondary arc guide plate 42; the main arc guide plate 41 is slidably connected to the hanging frame 1; the main arc guide plate 41 is fixed to the arc rack 43; a slide bar 411 is fixed to the main arc guide plate 41; two secondary arc guide plates 42 are provided, and the secondary arc guide plates 42 are slidably connected to the slide bar 411. The two secondary arc guide plates 42 are symmetrically arranged, and the main arc guide plate 41 and the two secondary arc guide plates 42 are tightly together; the main arc The surface of the guide plate 41 is a smooth structure. The released anti-slip strap 32 will move along the smooth surface of the main arc guide plate 41 and extend forward around the rear and lower part of the bundled pipe; the surface of the two secondary arc guide plates 42 is respectively provided with an anti-slip rubber layer to prevent the steel pipe from slipping; the surface of the two secondary arc guide plates 42 is respectively provided with a number of anti-slip protrusion structures 421 to enhance the anti-slip effect; the left and right sides of the main arc guide plate 41 are each fixed with a limit strip 46, and the two limit strips 46 jointly guide the released anti-slip strap 32.

[0037] In this embodiment, after the lifting frame 1 cooperates with the claw hook 23 to lift the two ends of the bundled pipe bundle 5 upward, the self-locking motor 44 drives the gear 45 to drive the arc rack 43 to push the main arc guide plate 41 and the secondary arc guide plate 42 connected thereto to slide downward. Figure 9As shown, the two secondary arc-shaped guide plates 42 are both located below the bundled pipe bundle 5 to provide anti-fall protection therefor. After the staff pulls out the anti-fall strap 32 in the first strap electric-controlled retractor 31, winds it under the bundled pipe bundle 5 and tightens it in the second strap electric-controlled retractor 33, the staff then pushes the two secondary arc-shaped guide plates 42 to open away from each other along the slide rod 411, as shown in FIG. Figure 10 As shown, the two secondary arc-shaped guide plates 42 are respectively provided on both sides of the bundled pipe bundle 5 away from the middle to provide anti-falling protection for the bundled pipe bundle 5. Even if some pipes in the bundled pipe bundle 5 accidentally fall off, the pipes that accidentally fall downward will be supported and protected by the secondary arc-shaped guide plates 42 on both sides below. Moreover, since the two secondary arc-shaped guide plates 42 are respectively located on both sides of the bundled pipe bundle 5 away from the middle, the pipes that accidentally fall downward onto the secondary arc-shaped guide plates 42 on both sides will not lose balance in the left-right direction and fall to one side, thereby enhancing the anti-falling protection effect of the pipes.

[0038] Example 3

[0039] like Figure 6 and Figure 7 As shown, based on Example 2, the lower ends of the two secondary arc-shaped guide plates 42 of this embodiment are each provided with a wedge-shaped inclined surface structure 420; and a plurality of rollers 422 are rotatably connected to each of the two secondary arc-shaped guide plates 42.

[0040] In this embodiment, after the claw hook 23 on the hoisting frame 1 cooperates with the anti-slip strap 32 and the auxiliary arc-shaped guide plates 42 on both sides to lift the bundled pipe bundle 5 to the target position, before lowering the bundled pipe bundle 5, the staff first controls the hoisting frame 1 to lower the auxiliary arc-shaped guide plates 42 on both sides located below the bundled pipe bundle 5 to the ground. At this time, the auxiliary arc-shaped guide plates 42 on both sides are in contact with the ground through the rollers 422, and the auxiliary arc-shaped guide plates 42 are clamped between the bundled pipe bundle 5 and the ground, allowing the bundled pipe bundle 5 to be lowered. The first strap electrically controlled reel 31 promptly retracts the portion of the anti-slip band 32 that has been pulled out, and the second strap electrically controlled reel 33 releases the anti-slip band 32 after the anti-slip band 32 leaves the second strap electrically controlled reel 33. As the anti-slip band 32 is isolated from the ground, the anti-slip band 32 can pass smoothly under the bundled pipe bundle 5 during the retraction process, and the bundled pipe bundle 5 loses the anti-slip band. After the belt 32 is tied, the secondary arc-shaped guide plate 42 will replace the anti-slip band 32 to support the bundled pipe bundle 5, and there will be no serious wear and tear caused by the anti-slip band 32 being pressed against the ground by the bundled pipe bundle 5. Then the staff will control the self-locking motor 44 to reversely drive the gear 45 to drive the arc-shaped rack 43 to push the main arc-shaped guide plate 41 and the secondary arc-shaped guide plate 42 connected to it to retract upwards. At the same time, the roller 422 will replace the secondary arc-shaped guide plate 42 pressed by the bundled pipe bundle 5 to contact the ground, avoiding the secondary arc-shaped guide plate 4 Under the downward pressure of the bundled pipe bundle 5, severe wear occurs between the bundled pipe bundle 5 and the ground. In the process of the retracted secondary arc-shaped guide plate 42 leaving the bottom of the bundled pipe bundle 5, the bundled pipe bundle 5 slowly slides down to the ground along the wedge-shaped inclined surface structure 420 on the secondary arc-shaped guide plate 42. This prevents the bundled pipe bundle 5 from being damaged by falling to the ground under the action of gravity due to the secondary arc-shaped guide plate 42 suddenly leaving the bottom of the bundled pipe bundle 5. This provides damage protection for the anti-slip strap 32, the secondary arc-shaped guide plate 42, and the bundled pipe bundle 5.

[0041] Example 4

[0042] like Figure 8 As shown, based on Example 1, each claw hook 23 of this embodiment is rotatably connected to two pressure rods 231; a torsion spring 232 is fixed between each pressure rod 231 and the corresponding claw hook 23; and an anti-slip pad 233 is fixed to each pressure rod 231.

[0043] When the hook 231 is in the open position, the clamping member 231 is in the open position, and the clamping member 231 is in the open position, so that the clamping member 231 is in the open position, and the clamping member 231 is in the open position, so that the clamping member 231 is in the open position, and the clamping member 231 is in the open position, so that the clamping member 231 is in the open position, and the clamping member 231 is in the open position, so that the clamping member 231 is in the open position, so that the clamping member 231 is in the open position,

[0044] The technical principles of the embodiments of the present invention have been described above in conjunction with specific embodiments. These descriptions are intended solely to explain the principles of the embodiments of the present invention and should not be construed in any way as limiting the scope of protection of the embodiments of the present invention. Based on the explanations herein, those skilled in the art will be able to conceive of other specific implementations of the embodiments of the present invention without inventive effort, and such implementations will fall within the scope of protection of the embodiments of the present invention.

Claims

1. A pipe hanger with an anti-drop function, comprising a hanging frame (1); Its characteristics are: The utility model also includes an electric-controlled chain reel (21); the left side and the right side of the hoisting frame (1) are each equipped with an electric-controlled chain reel (21); an anti-slip chain (22) is wound around the electric-controlled chain reel (21); an end of the anti-slip chain (22) that is released outward is fixedly connected with a claw hook (23) for hooking the strapping belt of the bundled pipe (5); the hoisting frame (1) is equipped with a first strap electric-controlled reel (31); a first strap electric-controlled reel (31) is wound around the first strap electric-controlled reel (31) for tightening the bundled pipe An anti-slip strap (32) is provided in the middle of the guide beam (5); a second strap electric-controlled retractor (33) for tightening the anti-slip strap (32) is installed on the hoisting frame (1); an arc-shaped guide plate (4) is slidably connected to the hoisting frame (1); an arc-shaped rack (43) is fixedly connected to the arc-shaped guide plate (4); a self-locking motor (44) is installed on the hoisting frame (1); each output shaft of the self-locking motor (44) is fixedly connected to a gear (45); the gear (45) is meshed with the arc-shaped rack (43); Two fixing plates (11) are provided on the hanging frame (1); the fixing plates (11) are provided with limiting cylinders (24) corresponding in number and position to the anti-drop chains (22); The fixing plate (11) is slidably connected to the hanging frame (1); an adjusting bolt (12) is fixedly connected between the fixing plate (11) and the hanging frame (1); The second strap electric-controlled retractor (33) is equipped with a tension monitoring module for monitoring the retracting tension of the anti-slip strap (32); a tightening indicator light (34) is installed on the second strap electric-controlled retractor (33), and the tightening indicator light (34) is connected to the tension monitoring module built into the second strap electric-controlled retractor (33) through a circuit; The arc guide plate (4) is composed of a main arc guide plate (41) and a secondary arc guide plate (42); the main arc guide plate (41) is slidably connected to the hanging frame (1); the main arc guide plate (41) is fixedly connected to the arc rack (43); a slide bar (411) is fixedly connected to the main arc guide plate (41); and the secondary arc guide plate (42) is slidably connected to the slide bar (411).

2. A pipe hanger with an anti-drop function according to claim 1, characterized in that: The surface of the secondary arc-shaped guide plate (42) is provided with an anti-skid rubber layer for preventing the steel pipe from sliding; the anti-skid rubber layer on the surface of the secondary arc-shaped guide plate (42) is provided with a plurality of anti-skid convex block structures (421) for enhancing the anti-skid effect.

3. A pipe hanger with an anti-drop function according to claim 2, characterized in that: A limiting strip (46) is fixedly connected to the left and right sides of the main arc-shaped guide plate (41).

4. The pipe hanger with anti-drop function according to claim 1 is characterized in that: A pressure rod (231) is rotatably connected to the claw hook (23); a torsion spring (232) is fixedly connected between the pressure rod (231) and the corresponding claw hook (23); and an anti-slip pad (233) is fixedly connected to the pressure rod (231).

5. The pipe hanger with anti-drop function according to claim 1 is characterized in that: A wedge-shaped inclined surface structure (420) is provided at the lower end of the secondary arc-shaped guide plate (42).

6. A pipe hanger with an anti-drop function according to claim 5, characterized in that: A plurality of rollers (422) are rotatably connected to the secondary arc-shaped guide plate (42).

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