Metal pipe straightening device

Abstract

The utility model provides a metal pipe straightening device which comprises a machine body, a trough and a roller type straightening mechanism, the trough is arranged in the machine body, the roller type straightening mechanism is installed above the trough, the roller type straightening mechanism comprises a first roller shaft and a second roller shaft which are parallel to each other, the first roller shaft and the second roller shaft are both distributed in the length direction of the trough, and the first roller shaft and the second roller shaft are arranged on the machine body. A first rotating roller is fixedly arranged on the first roller shaft, a second rotating roller is fixedly arranged on the second roller shaft, the first rotating roller and the second rotating roller are both in close contact with a metal pipe to be straightened, and an adjusting mechanism used for adjusting the distance between the first roller shaft and the second roller shaft is arranged between the first roller shaft and the second roller shaft. The distance between the first roller shaft and the second roller shaft can be changed through the adjusting structure, so that the roller gap distance between the first rotating roller and the second rotating roller is matched with the pipe diameter of a metal pipe to be straightened, and the metal pipe straightening device is suitable for straightening metal pipes with different pipe diameters.

Description

Technical Field

[0001] The utility model relates to the technical field of straightening equipment, in particular to a metal pipe straightening device. Background Art

[0002] The metal pipe polishing and straightening mechanism is a mechanical device for polishing and straightening metal pipes. It usually consists of the following parts: a feeding system, a polishing system, a straightening system, and a discharging system. It can be widely used in the metal processing industry. Especially when manufacturing metal pipes such as steel pipes, copper pipes, and aluminum pipes, it can effectively improve the quality and appearance of the pipes and meet the needs of different industries for metal pipes. However, in actual production, the straightening device in the above-mentioned straightening system can generally only straighten pipes with a specific pipe diameter. If pipes with different pipe diameters need to be straightened, multiple straightening devices need to be equipped, which will greatly increase the production cost.

[0003] Therefore, aiming at the problem that the existing straightening device cannot straighten pipe materials with different pipe diameters, the existing technology still needs to be improved and developed. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a metal pipe straightening device that can adjust the distance between the straightening rollers, i.e., the rotating rollers, aiming at the defects and deficiencies of the existing technology.

[0005] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0006] The utility model provides a metal pipe straightening device, which includes a machine body, a material trough, and a roller type straightening mechanism. The material trough is arranged in the machine body. Specifically, feeding ports and discharging ports can be arranged on both side walls of the machine body. The feeding end of the material trough corresponds to the feeding port, and the discharging end of the material trough corresponds to the discharging port. The roller type straightening mechanism is also installed in the machine body and is located above the material trough. The roller type straightening mechanism includes a first roller shaft and a second roller shaft that are parallel to each other. The first roller shaft and the second roller shaft are both distributed along the length direction of the material trough. A first rotating roller is fixedly arranged on the first roller shaft, and a second rotating roller is fixedly arranged on the second roller shaft. The first rotating roller and the second rotating roller are both in close contact with the metal pipe to be straightened. An adjusting mechanism for adjusting the distance between the first roller shaft and the second roller shaft is arranged between the first roller shaft and the second roller shaft. Through the above structural arrangement, the distance between the first roller shaft and the second roller shaft can be changed through the adjusting structure, so that the gap distance between the first rotating roller and the second rotating roller is adapted to the pipe diameter of the metal pipe to be straightened, making the utility model suitable for straightening metal pipes with different pipe diameters. During operation, the metal pipe to be straightened enters from the feeding end of the material trough and exits from the discharging end of the material trough under the action of an external force. At the same time, the first rotating roller and the second rotating roller are driven to rotate and squeeze the bent part of the metal pipe to be straightened, thereby realizing the straightening of the metal pipe.

[0007] According to the above solution, the adjusting mechanism includes a connecting component, a driving structure and a guide rail. The connecting component includes connecting piece A and connecting piece B. The first end of connecting piece A is movably connected to the first roller shaft, and the second end of connecting piece A is fixedly connected to the driving structure. The first end of connecting piece B is movably connected to the second roller shaft, and the second end of connecting piece B is fixedly connected to the driving structure. Through the above structural arrangement, the driving structure can move the connecting component to change the distance between the first roller shaft and the second roller shaft.

[0008] There are two groups of guide rails, namely the first group of guide rails and the second group of guide rails. The first ends of the first roller shaft and the second roller shaft are both placed on the first group of guide rails, and the second ends of the first roller shaft and the second roller shaft are both placed on the second group of guide rails. The driving structure drives the first roller shaft and the second roller shaft to move along the guide rail through connecting piece A and connecting piece B. Through the above structural arrangement, the ends of the first roller shaft and the second roller shaft are in contact with the guide rail, which is beneficial to the first roller shaft and the second roller shaft to achieve directional movement when operating the driving structure.

[0009] According to the above solution, the driving structure includes a screw cylinder, a bidirectional screw rod and a knob. The screw cylinder includes a first screw cylinder and a second screw cylinder. The knob is fixedly sleeved on the bidirectional screw rod. The knob is rotatably installed on the machine body through a bracket. The first screw cylinder is threadedly connected to the first end of the bidirectional screw rod, and the second screw cylinder is threadedly connected to the second end of the bidirectional screw rod. The second end of connecting piece A is fixedly connected to the first screw cylinder, and the second end of connecting piece B is fixedly connected to the second screw cylinder. Through the above structural arrangement, the knob can be rotated counterclockwise or clockwise, so that the bidirectional screw rod also rotates counterclockwise or clockwise, and then the first screw cylinder and the second screw cylinder move closer to or away from each other, achieving the effect of adjusting the distance between connecting piece A and connecting piece B.

[0010] According to the above solution, connecting piece A includes a connecting rod A and a sleeve A that are fixedly connected to each other, and connecting piece B includes a connecting rod B and a sleeve B that are fixedly connected to each other. Sleeve A is sleeved on the first roller shaft, and sleeve B is sleeved on the second roller shaft. The end of connecting rod A away from sleeve A is fixedly connected to the first screw cylinder, and the end of connecting rod B away from sleeve B is fixedly connected to the second screw cylinder. Through the above structural arrangement, sleeve A and sleeve B are respectively sleeved on the first roller shaft and the second roller shaft, which not only does not affect the rotation of the first roller shaft and the second roller shaft, but also can adjust the distance between the first roller shaft and the second roller shaft.

[0011] According to the above solution, two driving structures are provided. The two driving structures are installed on the machine body and symmetrically distributed. Two connecting pieces A are provided. The two connecting pieces A correspond to the two driving structures one by one. Two connecting pieces B are provided. The two connecting pieces B correspond to the two driving structures one by one. Through the above structural arrangement, accurate adjustment of the distances at both ends of the first roller shaft and the second roller shaft can be achieved, which is beneficial to improving the straightening effect of the metal pipe.

[0012] According to the above solution, the roller straightening mechanism includes a power mechanism. The power mechanism includes a driving wheel and a driven wheel. The driving wheel is connected to a driving motor. The driven wheel is fixedly sleeved on the first roller shaft. The driving wheel and the driven wheel are connected by belt drive. Through the above structural arrangement, the driving wheel, the driven wheel and the belt cooperate to realize the rotation of the first roller shaft, and further realize the rotational extrusion and straightening between the metal pipe and the first rotating roller and the second rotating roller.

[0013] According to the above solution, the power mechanism further includes a belt tensioning structure. The belt tensioning structure includes a guide wheel, a guide wheel bracket, a sliding cylinder, a screw tube, a screw rod, a baffle and a spring. The guide wheel is installed on the guide wheel bracket. The belt is tightly wound around the guide wheel. The lower end of the sliding cylinder is fixed to the guide wheel bracket. A through hole is provided at the upper end of the sliding cylinder. The spring and the baffle are both arranged inside the sliding cylinder. A sliding pin is fixedly provided on the side of the baffle. A guide groove is provided on the side wall of the sliding cylinder. The sliding pin is movably limited in the guide groove up and down. The lower end of the screw tube sequentially passes through the through hole and the spring and is fixedly connected to the baffle. The upper end of the spring abuts against the inner side of the sliding cylinder. The lower end of the spring abuts against the baffle. An operation block is fixed to the upper end of the screw rod. The lower end of the screw rod passes through the outer wall of the machine body and is threadedly connected to the upper end of the screw tube. The operation block abuts against the outer wall of the machine body. Through the above structural arrangement, after the utility model is used for a long time, the operation block at the upper end of the screw rod can be rotated to make the screw rod and the screw tube perform a threaded movement, and then make the screw tube move upward, and then make the spring drive the sliding cylinder to move upward. The guide wheel bracket and the guide wheel move upward together, thereby realizing the tensioning of the belt, avoiding the loosening of the belt caused by the long-term use of the device, and ensuring the straightening effect of the device.

[0014] According to the above solution, the belt tensioning structure further includes a guide rod. A guide hole is provided on the outer wall of the machine body. The lower end of the guide rod is fixed to the guide wheel bracket. The upper end of the guide rod passes through the guide hole. Through the above structural arrangement, the guide rod is limited to move up and down in the guide hole, and is more stable when the guide wheel bracket moves up and down and will not sway left and right.

[0015] According to the above solution, the first rotating roller is a cylindrical roller, the second rotating roller is a conical roller, and there are two sets of the first rotating roller and the second rotating shaft. The two sets of the first rotating rollers are respectively arranged at both ends of the first roller shaft, and the two sets of the second rotating rollers are respectively arranged at both ends of the second roller shaft. Through the above structural arrangement, it is beneficial to the extrusion and straightening of the metal pipe, and it is beneficial for the metal pipe to move smoothly from the feed port to the discharge port under the drive of external force.

[0016] Advantages of the present utility model:

[0017] Through the above structural arrangement, the present utility model can change the distance between the first roller shaft and the second roller shaft by adjusting the structure, and further make the roll gap distance between the first rotating roller and the second rotating roller adapt to the diameter size of the metal pipe to be straightened, so that the present utility model is applicable to the straightening of metal pipes with different diameters. During operation, the metal pipe to be straightened enters from the feed end of the material trough under the action of external force and is output from the discharge end of the material trough. At the same time, the first rotating roller and the second rotating roller are driven to rotate and squeeze the bent part of the metal pipe to be straightened, thereby realizing the straightening of the metal pipe. Description of the drawings

[0018] Figure 1 is the overall external shape structure schematic diagram of the present utility model;

[0019] Figure 2 is the schematic diagram of the adjusting mechanism of the present utility model;

[0020] Figure 3 is the schematic diagram of the power mechanism of the present utility model;

[0021] Figure 4 is Figure 3 the enlarged structure schematic diagram at A in

[0022] In the figure: 1, machine body; 2, material trough; 3, first roller shaft; 4, second roller shaft; 5, first rotating roller; 6, second rotating roller; 7, first group of guide rails; 8, adjusting mechanism; 9, power mechanism; 10, feed port; 11, discharge port; 81, first screw barrel; 82, second screw barrel; 83, bidirectional screw; 84, knob; 85, bracket; 86, link A; 87, sleeve A; 88, link B; 89, sleeve B; 91, driving wheel; 92, driven wheel; 93, belt; 94, belt tensioning structure; 95, guide rod; 941, guide wheel; 942, guide wheel bracket; 943, sliding cylinder; 944, screw pipe; 945, screw; 946, baffle; 947, spring; 948, sliding pin; 949, operating block. Detailed implementation manners

[0023] The technical solutions of the present utility model will be described below in conjunction with the drawings and embodiments.

[0024] AsFigure 1-2 As shown in the figure, a metal pipe straightening device of the present utility model includes a machine body 1, a material trough 2 and a roller type straightening mechanism. The material trough 2 is arranged inside the machine body 1. Feed ports 10 and discharge ports 11 are respectively arranged on both side walls of the machine body 1. The feed end of the material trough 2 corresponds to the feed port 10, and the discharge end of the material trough 2 corresponds to the discharge port 11. The roller type straightening mechanism is also installed inside the machine body 1 and is located above the material trough 2. The roller type straightening mechanism includes a first roller shaft 3 and a second roller shaft 4 that are parallel to each other. Both the first roller shaft 3 and the second roller shaft 4 are distributed along the length direction of the material trough 2. A first rotating roller 5 is fixedly arranged on the first roller shaft 3, and a second rotating roller 6 is fixedly arranged on the second roller shaft 4. Both the first rotating roller 5 and the second rotating roller 6 are in close contact with the metal pipe to be straightened. An adjusting mechanism 9 for adjusting the distance between the first roller shaft 3 and the second roller shaft 4 is arranged between the first roller shaft 3 and the second roller shaft 4. Through the above structural arrangement, the distance between the first roller shaft 3 and the second roller shaft 4 can be changed by the adjusting structure, so that the gap distance between the first rotating roller 5 and the second rotating roller 6 is adapted to the pipe diameter of the metal pipe to be straightened, making the present utility model applicable to the straightening of metal pipes with different pipe diameters. During operation, the metal pipe to be straightened enters from the feed end of the material trough 2 and exits from the discharge end of the material trough 2 under the action of an external force. At the same time, the first rotating roller 5 and the second rotating roller 6 are driven to rotate and press the bent part of the metal pipe to be straightened, thereby realizing the straightening of the metal pipe.

[0025] Further, the adjusting mechanism 9 includes a connecting component, a driving structure and a guide rail. The connecting component includes a connecting piece A and a connecting piece B. The first end of the connecting piece A is connected to the first roller shaft 3, and the second end of the connecting piece A is connected to the driving structure. The first end of the connecting piece B is connected to the second roller shaft 4, and the second end of the connecting piece B is connected to the driving structure. Through the above structural arrangement, the driving structure can drive the connecting component to move, thereby changing the distance between the first roller shaft 3 and the second roller shaft 4.

[0026] There are two groups of guide rails, namely the first group of guide rails 7 and the second group of guide rails (not shown in the figure). The first ends of the first roller shaft 3 and the second roller shaft 4 are both placed on the first group of guide rails 7, and the second ends of the first roller shaft 3 and the second roller shaft 4 are both placed on the second group of guide rails. The driving structure drives the first roller shaft 3 and the second roller shaft 4 to move along the guide rails through the connecting piece A and the connecting piece B. Through the above structural arrangement, the ends of the first roller shaft 3 and the second roller shaft 4 are in contact with the guide rails, which is beneficial to the first roller shaft 3 and the second roller shaft 4 to achieve directional movement when operating the driving structure.

[0027] Such as Figure 2As shown, the driving structure includes a screw barrel, a bidirectional screw 83 and a knob 84, the screw barrel includes a first screw barrel 81 and a second screw barrel 82, the knob 84 is fixedly sleeved on the bidirectional screw 83, the knob 84 is rotatably mounted on the body 1 through a bracket 85, the first screw barrel 81 is threadedly connected to the first end of the bidirectional screw 83, the second screw barrel 82 is threadedly connected to the second end of the bidirectional screw 83, the second end of the connector A is fixedly connected to the first screw barrel 81, and the second end of the connector B is fixedly connected to the second screw barrel 82. Through the above structural arrangement, the knob 84 can be rotated counterclockwise or clockwise to make the bidirectional screw 83 rotate counterclockwise or clockwise as well, thereby making the first screw barrel 81 and the second screw barrel 82 approach or move away from each other, so as to achieve the effect of adjusting the distance between the connector A and the connector B.

[0028] Further, the connecting member A includes a connecting rod A86 and a sleeve A87 which are fixedly connected to each other, and the connecting member B includes a connecting rod B88 and a sleeve B89 which are fixedly connected to each other, the sleeve A87 is sleeved on the first roller 3, the sleeve B89 is sleeved on the second roller 4, the end of the connecting rod A86 away from the sleeve A87 is fixedly connected to the first screw barrel 81, and the end of the connecting rod B88 away from the sleeve B89 is fixedly connected to the second screw barrel 82. Through the above-mentioned structural setting, the sleeve A87 and the sleeve B89 are respectively sleeved on the first roller 3 and the second roller 4, which does not affect the rotation of the first roller 3 and the second roller 4, and can also realize the adjustment of the distance between the first roller 3 and the second roller 4.

[0029] Furthermore, the driving structures are provided with two (not shown in the figure), the two driving structures are installed on the machine body 1 and are symmetrically distributed, the connecting members A are provided with two, the two connecting members A correspond to the two driving structures one by one, and the connecting members B are provided with two, the two connecting members B correspond to the two driving structures one by one. Through the above structural setting, the distance between the two ends of the first roller 3 and the second roller 4 can be accurately adjusted, which is conducive to improving the straightening effect of the metal pipe.

[0030] like Figure 3 As shown, the roller straightening mechanism includes a power mechanism, which includes a driving wheel 91 and a driven wheel 92, wherein the driving wheel 91 is connected to a driving motor, and the driven wheel 92 is fixedly sleeved on the first roller shaft 3, and the driving wheel 91 and the driven wheel 92 are connected by a belt 93. Through the above-mentioned structural setting, the driving wheel 91, the driven wheel 92 and the belt 93 cooperate to realize the rotation of the first roller shaft 3, thereby realizing the rotation extrusion straightening between the metal pipe and the first rotating roller 5 and the second rotating roller 6.

[0031] like Figure 4As shown, the power mechanism further includes a belt tensioning structure 94. The belt tensioning structure 94 includes a guide wheel 941, a guide wheel bracket 942, a sliding cylinder 943, a screw tube 944, a screw rod 945, a baffle 946, and a spring 947. The guide wheel 941 is installed on the guide wheel bracket 942, and the belt 93 is tightly wound around the guide wheel 941. The lower end of the sliding cylinder 943 is fixed to the guide wheel bracket 942. A through hole is provided at the upper end of the sliding cylinder 943. Both the spring 947 and the baffle 946 are arranged inside the sliding cylinder 943. Slide pins 948 are fixedly provided on the left and right sides of the baffle 946. A guide groove (not shown in the figure) is provided on the side wall of the sliding cylinder 943. The slide pins 948 are movably limited in the guide groove up and down. The lower end of the screw tube 944 sequentially passes through the through hole and the spring 947 and is fixedly connected to the baffle 946. The upper end of the spring 947 abuts against the inner side of the sliding cylinder 943, and the lower end of the spring 947 abuts against the baffle 946. An operation block 949 is fixed to the upper end of the screw rod 945. The lower end of the screw rod 945 passes through the outer wall of the machine body 1 and is threadedly connected to the upper end of the screw tube 944. The operation block 949 abuts against the outer wall of the machine body 1. Through the above structural arrangement, after the long-term use of the present utility model, the operation block 949 at the upper end of the screw rod 945 can be rotated to make the screw rod 945 perform a threaded movement with the screw tube 944, so that the screw tube 944 moves upward, and then the spring 947 drives the sliding cylinder 943 to move upward, and the guide wheel bracket 942 and the guide wheel 941 move upward together, thereby realizing the tensioning of the belt 93, avoiding the loosening of the belt 93 caused by the long-term use of the device, and ensuring the straightening effect of the device.

[0032] Further, the belt tensioning structure 94 further includes a guide rod 95. A guide hole is provided on the outer wall of the machine body 1. The lower end of the guide rod 95 is fixed to the guide wheel bracket 942, and the upper end of the guide rod 95 passes through the guide hole. Through the above structural arrangement, the guide rod 95 is limited to move up and down in the guide hole, and is more stable when the guide wheel bracket 942 moves up and down and will not sway left and right.

[0033] As Figure 1 shown, the first rotating roller 5 is a cylindrical roller, and the second rotating roller 6 is a conical roller. There are two sets of the first rotating roller 5 and the second rotating shaft. The two sets of the first rotating roller 5 are respectively arranged at both ends of the first roller shaft 3, and the two sets of the second rotating roller 6 are respectively arranged at both ends of the second roller shaft 4. Through the above structural arrangement, it is beneficial to the extrusion and straightening of the metal pipe, and it is beneficial for the metal pipe to move smoothly from the feed port 10 to the discharge port 11 under the drive of an external force.

[0034] The above are only the preferred embodiments of the present utility model. Therefore, all equivalent changes or modifications made according to the structures, features and principles described in the scope of the patent application of the present utility model are included in the scope of the patent application of the present utility model.

Claims

1. A metal pipe straightening device, comprising a machine body, a material trough and a roller type straightening mechanism. The material trough is arranged inside the machine body, and the roller type straightening mechanism is installed above the material trough. It is characterized in that, The roller straightening mechanism includes a first roller shaft and a second roller shaft that are parallel to each other. Both the first roller shaft and the second roller shaft are distributed along the length direction of the material chute. A first rotating roller is fixedly provided on the first roller shaft, and a second rotating roller is fixedly provided on the second roller shaft. Both the first rotating roller and the second rotating roller are in close contact with the metal pipe to be straightened. An adjusting mechanism for adjusting the distance between the first roller shaft and the second roller shaft is provided between the first roller shaft and the second roller shaft.

2. The metal pipe straightening device according to claim 1, characterized in that, The adjusting mechanism includes a connecting component, a driving structure, and a guide rail. The connecting component includes a connecting piece A and a connecting piece B. The first end of the connecting piece A is movably connected to the first roller shaft, and the second end of the connecting piece A is fixedly connected to the driving structure. The first end of the connecting piece B is movably connected to the second roller shaft, and the second end of the connecting piece B is fixedly connected to the driving structure. There are two sets of the guide rails, namely the first set of guide rails and the second set of guide rails. The first ends of the first roller shaft and the second roller shaft are both placed on the first set of guide rails, and the second ends of the first roller shaft and the second roller shaft are both placed on the second set of guide rails. The driving structure drives the first roller shaft and the second roller shaft to move along the guide rails through the connecting piece A and the connecting piece B.

3. The metal pipe straightening device according to claim 2, characterized in that, The driving structure includes a screw cylinder, a bidirectional screw, and a knob. The screw cylinder includes a first screw cylinder and a second screw cylinder. The knob is fixedly sleeved on the bidirectional screw, and the knob is rotatably installed on the machine body through a bracket. The first screw cylinder is threadedly connected to the first end of the bidirectional screw, and the second screw cylinder is threadedly connected to the second end of the bidirectional screw. The second end of the connecting piece A is fixedly connected to the first screw cylinder, and the second end of the connecting piece B is fixedly connected to the second screw cylinder.

4. The metal pipe straightening device according to claim 3, characterized in that, The connecting piece A includes a connecting rod A and a sleeve A that are fixedly connected to each other. The connecting piece B includes a connecting rod B and a sleeve B that are fixedly connected to each other. The sleeve A is sleeved on the first roller shaft, and the sleeve B is sleeved on the second roller shaft. The end of the connecting rod A away from the sleeve A is fixedly connected to the first screw cylinder, and the end of the connecting rod B away from the sleeve B is fixedly connected to the second screw cylinder.

5. The metal pipe straightening device according to claim 4, wherein, There are two driving structures. The two driving structures are installed on the machine body and are symmetrically distributed. There are two connecting pieces A. The two connecting pieces A correspond to the two driving structures one by one. There are two connecting pieces B. The two connecting pieces B correspond to the two driving structures one by one.

6. The metal pipe straightening device according to claim 1, characterized in that, The roller straightening mechanism includes a power mechanism. The power mechanism includes a driving wheel and a driven wheel. The driving wheel is connected to a driving motor, and the driven wheel is fixedly sleeved on the first roller shaft. The driving wheel and the driven wheel are connected by a belt drive.

7. The metal pipe straightening device according to claim 6, characterized in that, The power mechanism further includes a belt tensioning structure. The belt tensioning structure includes a guide wheel, a guide wheel bracket, a sliding cylinder, a screw tube, a screw rod, a baffle, and a spring. The guide wheel is installed on the guide wheel bracket, and the belt is tightly wound around the guide wheel. The lower end of the sliding cylinder is fixed to the guide wheel bracket, and a through hole is provided at the upper end of the sliding cylinder. The spring and the baffle are both arranged inside the sliding cylinder. A sliding pin is fixedly provided on the side of the baffle, and a guiding groove is provided on the side wall of the sliding cylinder. The sliding pin is movably limited up and down in the guiding groove. The lower end of the screw tube sequentially passes through the through hole and the spring and is fixedly connected to the baffle. The upper end of the spring abuts against the inner side of the sliding cylinder, and the lower end of the spring abuts against the baffle. An operating block is fixed to the upper end of the screw rod, and the lower end of the screw rod passes through the outer wall of the machine body and is threadedly connected to the upper end of the screw tube. The operating block abuts against the outer wall of the machine body.

8. The metal pipe straightening device according to claim 7, characterized in that, The belt tensioning structure further includes a guiding rod. A guiding hole is provided on the outer wall of the machine body, and the lower end of the guiding rod is fixed to the guide wheel bracket, and the upper end of the guiding rod passes through the guiding hole.

9. The metal pipe straightening device according to claim 1, characterized in that, The first rotating roller is a cylindrical roller, and the second rotating roller is a conical roller. There are two sets of the first rotating rollers and the second rotating rollers respectively. The two sets of the first rotating rollers are respectively arranged at both ends of the first roller shaft, and the two sets of the second rotating rollers are respectively arranged at both ends of the second roller shaft.

Images