Automatic point searching and pressing welding robot for steel reinforcement framework

Abstract

The invention provides an automatic point searching and pressing welding robot for a steel reinforcement framework. A base is assembled in a sliding mode in the first direction and the second direction which are perpendicular to each other. A welding device is arranged on the outer side of the base, longitudinal bar carding mechanisms are arranged on the two sides of the welding device, the two longitudinal bar carding mechanisms are symmetrically distributed on the two sides of the welding device, the welding device comprises a U-shaped welding part, and welding heads corresponding to points to be welded are arranged at the two ends of the U-shaped welding part; the welding device is assembled on the base in a sliding mode in the first direction, responds to the longitudinal bar carding mechanism, carded longitudinal bars and then extrudes the longitudinal bars on the stirrups to be welded, and the welding device welds and fixes the longitudinal bars and the stirrups towards the intersection points of the longitudinal bars and the stirrups. The longitudinal bar combing mechanism is arranged to comb longitudinal bars before welding, the welding device extends out to weld the intersection point of the stirrups and the longitudinal bars after the stirrups and the longitudinal bars are combed, so that the positioning precision of welding is guaranteed, and the longitudinal bar combing mechanism can move along with the lifting platform so as to adapt to the shape of the outer wall of the T-shaped beam, so that the welding requirement of the T-shaped beam is met.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic steel bar welding, and in particular relates to an automatic point-finding and clamping welding robot for a steel bar skeleton. Background Art

[0002] T-beam is a commonly used structural form in bridge engineering. With the vigorous development of transportation construction, automated steel skeleton production has gradually become one of the important development directions of mechanization in the construction industry. However, the key technologies involved are still immature. For example, in the production process of three-dimensional T-beam steel cage, the steel bars are densely distributed, resulting in a large number of welds. To ensure welding, the steel bars need to be combed. The existing automatic welding device is mainly for flat meshes with simple structures, which is difficult to apply in the production process of T-beam steel cage.

[0003] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art, and the present invention provides a steel bar skeleton automatic point finding and clamping welding robot.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A steel bar skeleton automatic point finding, pressing and welding robot, comprising:

[0007] Lifting platform;

[0008] A base, the base being slidably assembled along a first direction and a second direction perpendicular to each other;

[0009] A welding device is provided on the outside of the base, and longitudinal rib combing mechanisms are provided on both sides of the welding device. The two longitudinal rib combing mechanisms are symmetrically distributed on both sides of the welding device. The welding device includes a U-shaped welding piece, and welding heads corresponding to the points to be welded are provided at both ends of the U-shaped welding piece;

[0010] The welding device is slidably assembled on the base along a first direction. In response to the longitudinal reinforcement combing mechanism combing the longitudinal reinforcement and squeezing it onto the stirrup to be welded, the welding device moves toward the intersection of the longitudinal reinforcement and the stirrup to weld and fix the longitudinal reinforcement and the stirrup.

[0011] Preferably, the lifting platform is plate-shaped, and a stirrup combing mechanism is provided on a side of the lifting platform opposite to the welding device. The stirrup combing mechanism is slidably assembled along a first direction to extend out of the lifting platform to correspond to the clamping stirrups.

[0012] Preferably, a concave installation station is provided on a side of the base away from the lifting platform, the welding device is slidably assembled on the installation station along a first direction through a first guide column, and the welding device is driven by a first driving member.

[0013] Preferably, the base is slidably assembled on the bottom plate via a first slide bar and driven by a second driving member;

[0014] The bottom plate is slidably assembled on the lifting platform via a second slide bar and is driven by a third driving member.

[0015] Preferably, the second driving member is connected to the base via a buffer member, the buffer member includes two buffer plates distributed at intervals, a plurality of second guide pillars are provided between the two buffer plates, a push plate slidably assembled on the second guide pillars extends from the base, and a buffer spring is provided between the two buffer plates and the push plate.

[0016] Preferably, the longitudinal rib combing mechanism comprises two groups of rollers arranged along the second direction, and a guide groove corresponding to the longitudinal ribs and guiding the roller group is provided on a side of the roller group away from the welding device.

[0017] Preferably, each group of the rollers includes two rollers spaced apart in the longitudinal direction, and the two rollers are respectively arranged on both sides of the C-shaped member, one of the rollers is connected to a slide plate, and the slide plate is connected to the C-shaped member by an adjusting bolt to adjust the distance between the two rollers.

[0018] Beneficial effect: A longitudinal reinforcement combing mechanism is set to comb the longitudinal reinforcement before welding. After the stirrups and longitudinal reinforcements are combed, the welding device is extended to weld the intersection of the two, thereby ensuring the positioning accuracy of the welding. The longitudinal reinforcement combing mechanism can be displaced with the lifting platform to adapt to the shape of the outer wall of the T-beam, thereby meeting the T-beam welding requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0020] Figure 1 A simplified structural diagram of a welding robot in a specific embodiment provided by the present invention;

[0021] Figure 2 This is a simplified structural diagram of the bottom of the welding robot in the specific embodiment provided by the present invention;

[0022] Figure 3 A schematic structural diagram of a longitudinal rib combing mechanism in a specific embodiment provided by the present invention;

[0023] Figure 4 This is a simplified structural diagram of a plurality of welding robots assembled on a main frame in a specific embodiment provided by the present invention.

[0024] In the figure: 1. lifting platform; 2. lifting rod; 3. stirrup combing mechanism; 4. bottom plate; 5. base; 6. longitudinal reinforcement combing mechanism; 7. guide groove; 8. U-shaped welding part; 9. fourth driving member; 10. first sliding block; 11. base plate; 12. first driving member; 13. buffer plate; 14. second guide column; 15. buffer spring; 16. first guide column; 17. third driving member; 18. main frame; 19. distribution box; 20. guide rail; 21. T-beam frame; 22. second driving member; 601. C-shaped member; 602. roller; 603. slide plate; 604. adjusting bolt. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0026] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0028] like Figure 1-4As shown, a steel frame automatic point-finding and clamping welding robot includes a lifting platform 1 and a base 5. The lifting platform 1 has an assembly surface, so that the longitudinal reinforcement combing mechanism 6 and the welding device can be assembled. The lifting platform 1 is driven by the lifting rod 2 or the mechanical arm, and there are no excessive restrictions here. As the lifting platform 1 moves longitudinally, it can be displaced along the web of the T-beam to be welded to adapt to the welding requirements of longitudinal reinforcements at different heights. The base 5 is slidably assembled along a first direction and a second direction perpendicular to each other, wherein the first direction is the direction opposite to the web of the T-beam along the horizontal direction, and the second direction is the direction in which the longitudinal reinforcement extends.

[0029] A welding device is provided on the outside of the base 5, and the welding device is slidably assembled along the first direction. Two longitudinal rib combing mechanisms 6 are respectively located on both sides of the welding device, so that the longitudinal ribs on both sides of the welding device can be combed along the second direction. The longitudinal rib combing mechanisms 6 are used to limit the longitudinal ribs to ensure the position accuracy of the longitudinal ribs during welding.

[0030] The welding device includes a U-shaped welding piece 8, which is correspondingly assembled on the base 5. The two ends of the U-shaped welding piece 8 are provided with welding heads corresponding to the points to be welded. The spacing between the two welding heads is adapted to the outer diameter of the stirrup or the longitudinal reinforcement, so as to realize double-sided welding. The power supply part, control system, welding part and other auxiliary equipment of the welding device can be arranged on the lifting platform 1. The welding device can be a resistance welding. The two welding heads first move in a first direction and extend into the inner side of the stirrup, and then the cylinder moves in a second direction to bring the stirrup into the welding head, and then the welding head moves backward in the first direction to pull the stirrup back, and the stirrup and the longitudinal reinforcement are pressed together, and then resistance welding is performed. The principle of this welding is to melt and weld the intersection of the stirrup and the longitudinal reinforcement by electricity, which is not considered double-sided welding. Preferably, the welding head can point to the intersection of the upper and lower sides of the longitudinal reinforcement and the stirrup along a 45° inclination direction to meet the welding needs of the longitudinal reinforcement and the non-vertical stirrup.

[0031] In response to the longitudinal reinforcement combing mechanism 6 combing the longitudinal reinforcement and squeezing it onto the stirrup to be welded, the welding device moves to the intersection of the longitudinal reinforcement and the stirrup, so that the longitudinal reinforcement and the stirrup can be welded and fixed.

[0032] In an optional embodiment, a stirrup combing mechanism 3 is provided on a side of the lifting platform 1 opposite to the welding device, and the stirrup combing mechanism 3 is slidably assembled along a first direction to extend out of the lifting platform 1 to correspondingly clamp the stirrup.

[0033] In order to avoid mutual interference, the hoop bar combing mechanism 3 and the longitudinal bar combing mechanism 6 of the lifting platform 1 are respectively arranged on the opposite sides of the lifting platform 1, specifically on the upper side or the lower side. The hoop bar combing mechanism 3 is arranged in the middle of one side of the lifting platform 1, and preferably the hoop bar combing mechanism 3 is located at the midline of the upper side of the lifting platform 1. The hoop bar combing mechanism 3 is slidably assembled with the lifting platform 1 along a first direction, and the first direction is the direction of the T-beam web along the horizontal direction on both sides of the main frame 18. The hoop bar combing mechanism 3 can extend or retract into the lifting platform 1, and the hoop bar is clamped after the hoop bar combing mechanism 3 extends out of the lifting platform 1, thereby combing the hoop bar.

[0034] The lifting platform is a square plate, the shape of which is adapted to the lifting accommodating cavity on both sides of the main frame 18. Specifically, both sides of the main frame 18 include four columns distributed in a rectangular shape, thereby forming a square frame. The upper ends of the two square frames are fixed by multiple cross beams, and a third slide bar corresponding to the lifting platform is provided on the inner side of the column, and a first slider 10 corresponding to the third slide bar is provided on the lifting platform.

[0035] The longitudinal reinforcement combing mechanism 6 is arranged in the middle of the other side of the lifting platform 1 through the base 5, and the base 5 is slidably assembled along a first direction and a second direction perpendicular to the first direction, wherein the second direction is the direction along which the longitudinal reinforcement extends, so as to meet the needs of combing the longitudinal reinforcement, and a welding device slidably assembled along the first direction is provided in the middle of the base 5. In actual use, the stirrup combing mechanism 3 extends out to clamp the stirrup, and then the longitudinal reinforcement is manually or mechanically loaded into the longitudinal reinforcement combing mechanism 6. At this time, the stirrup combing mechanism 3 and the longitudinal reinforcement combing mechanism 6 respectively position the stirrup and the longitudinal reinforcement, and then the longitudinal reinforcement combing mechanism 6 presses the longitudinal reinforcement on the outside of the stirrup, and the welding device extends along the first direction with the base 5 to the intersection of the stirrup and the longitudinal reinforcement to weld and fix the stirrup and the longitudinal reinforcement.

[0036] In an optional embodiment, the U-shaped welding part 8 is fixedly or rotatably connected through a base plate 11. The U-shaped welding part 8 is located on the side wall of the base plate 11 close to the T-beam. The base plate 11 is slidably assembled with the base 5. A stepper motor is provided on the side wall of the base plate 11 away from the T-beam. The stepper motor passes through the base plate 11 and is connected to the U-shaped welding part 8, so that the angle of the U-shaped welding part 8 can be rotated, thereby adjusting the welding point position at different positions. A first guide column 16 is provided at the front end of the cylinder body of the first driving member 12, and the piston rod of the first driving member 12 is correspondingly fixed on the base plate 11.

[0037] In an optional embodiment, the base 5 is in the shape of a strip plate or a block, and a concave installation station is provided on the side close to the T beam. Preferably, the base 5 is in the shape of a strip plate, and the middle part thereof is formed by bending to form an installation station, and the installation station is adapted to the U-shaped welding piece 8 of the welding device, or adapted to the substrate 11 corresponding to the U-shaped welding piece 8. The installation station is provided with at least two first guide columns 16 pointing to the T beam, and the substrate 11 of the welding device is slidably assembled on the installation station along the first direction through the first guide columns 16, and the substrate 11 is provided with a corresponding first guide column 16, a first driving member 12 is provided on the base 5, the first driving member 12 drives the U-shaped welding member 8 of the welding device along the first direction, the base 5 is slidably assembled on the bottom plate 4 through a first slide bar, the first slide bar extends along the first direction, and a second driving member 22 corresponding to driving the base 5 to slide along the first direction is provided on the bottom plate 4, the bottom plate 4 is slidably assembled on the lifting platform 1 through a second slide bar, the second slide bar extends along the second direction, and a third driving member 17 corresponding to driving the bottom plate 4 to slide along the second direction is provided on the lifting platform 1.

[0038] In any embodiment, the first driving member 12, the second driving member 22, the third driving member 17 and the fourth driving member 9 can be any one of a pneumatic cylinder, an oil cylinder or a ball screw.

[0039] The first slide bar, the second slide bar, the third slide bar and the fourth slide bar are all dovetail-shaped, and corresponding dovetail-shaped sliding blocks are provided on the corresponding bottom plate 4 , the base 5 and the lifting platform 1 .

[0040] In an optional embodiment, the second driving member 22 is connected to the base 5 via a buffer member, which prevents the welding device or the longitudinal reinforcement combing mechanism 6 from making hard contact with the stirrups, thereby reducing damage to the steel bars or welding equipment through buffering.

[0041] The buffer member includes two buffer plates 13 distributed at intervals, a plurality of second guide columns 14 are arranged between the two buffer plates 13, the two buffer plates 13 are fixedly connected to the piston rod of the second driving member 22, a push plate slidably assembled on the second guide column 14 extends from the base 5, the push plate extends between the two buffer plates 13, and is slidably assembled with the piston rod of the second driving member 22, a buffer spring 15 is arranged between the two buffer plates 13 and the push plate, thereby realizing the buffer function through the buffer spring 15.

[0042] In an optional embodiment, in order to limit the top of the stirrups, a stirrup combing mechanism 3 extending longitudinally is provided in the middle of the main frame 18. The stirrup combing mechanism 3 in the middle of the main frame 18 and the stirrup combing mechanism 3 on the lifting platform 1 are in the same plane, so that they can act on the same stirrup. The stirrup combing mechanism 3 clamps the top of the stirrups along the longitudinal direction, and can cooperate with the stirrup combing mechanism 3 on the lifting platform 1 to ensure the stability and positioning accuracy of the stirrups.

[0043] In an optional embodiment, the longitudinal rib combing mechanism 6 is combed by two groups of rollers arranged along the second direction. There is no need for a large spacing between the two groups of rollers, and a spacing of 5-10 cm is sufficient. A guide groove 7 for the guide roller group corresponding to the longitudinal ribs is provided on the side of the longitudinal rib combing mechanism 6 away from the welding device. The guide groove 7 is a metal groove open at the top, and the end of the metal groove is a V-shaped guide nozzle to guide the longitudinal ribs.

[0044] Two groups of rollers are fixed at both ends of the same C-shaped member 601. The C-shaped member 601 can be a channel steel, which is fixed to the base 5 by welding or bolts. Each group of rollers includes two rollers 602 spaced apart in the longitudinal direction. The spacing between the two rollers 602 is adapted to the diameter of the longitudinal ribs. The guide groove 7 is connected to the middle of the C-shaped member 601 by welding or bolting. The two rollers 602 are respectively arranged on both sides of the C-shaped member 601. One of the rollers 602 in the same roller group is fixed to the upper side of the inner groove of the C-shaped member 601, and the other roller 602 is assembled on the lower side of the inner groove of the C-shaped member 601 through a slide plate 603. The slide plate 603 is connected to the C-shaped member 601 through an adjusting bolt 604. The adjusting bolt 604 extends upward from the C-shaped member 601 and is connected to a screw cap. The spacing between the two rollers 602 is adjusted by adjusting the bolt 604.

[0045] The lower rollers 602 of the two roller groups of the same C-shaped member 601 are correspondingly connected to the same slide plate 603 . A third guide column is provided at the lower end of the slide plate 603 . The third guide column is slidably assembled on the lower side of the C-shaped member 601 .

[0046] In an optional embodiment, the lifting platform 1 is slidably assembled on the main frame 18 along the longitudinal direction, and the main frame 18 is provided with a lifting rod 2 corresponding to the lifting platform 1. The main frame 18 is a portal frame made of square steel or steel and corresponding to the T-beam frame 21. The shape of the T-beam frame 21 is adapted to the shape of the T-beam steel bar. The T-beam frame 21 is provided with a placement groove corresponding to the stirrup, so that the stirrup is installed and placed in a preset spacing and direction. The two sides of the main frame 18 corresponding to the T-beam frame 21 are lifting spaces.

[0047] Multiple lifting platforms 1 are installed on both sides of the main frame 18 for longitudinal sliding. The lifting platforms 1 are used to install the stirrup combing mechanism 3 and the longitudinal reinforcement combing mechanism 6, thereby driving the stirrup combing mechanism 3 and the longitudinal reinforcement combing mechanism 6 to move longitudinally, so as to adapt to the longitudinal reinforcements spaced apart in the longitudinal direction, and the stirrups can be combed and positioned as the stirrup combing mechanism 3 rises.

[0048] In an optional embodiment, a plurality of lifting rods 2 are linearly arranged on the top of the main frame 18. The lifting rods 2 can be any one of a pneumatic cylinder, an oil cylinder, and a ball screw. The lifting rods 2 can be extended and retracted in the longitudinal direction to drive the lifting platform 1 to move in the longitudinal direction. The lifting platform 1 is provided with a through hole corresponding to the lifting rod 2. The lifting rod 2 passes through the through hole once in the longitudinal direction. After the plurality of lifting rods 2 pass through the through hole in the longitudinal direction, they are connected one by one with the corresponding plurality of lifting platforms 1 to independently drive the lifting platform 1. Specifically, taking the four lifting platforms 1 set in the present application as an example, four corresponding lifting rods 2 are set, among which the first lifting rod 2 passes through the main frame 18 and is connected with the lifting platform 1 from top to bottom. The first lifting platform 1 is connected, the second lifting rod 2 passes through the first lifting platform 1 from top to bottom and then is connected to the second lifting platform 1, the third lifting rod 2 passes through the first and second lifting platforms 1 from top to bottom and then is connected to the third lifting platform 1, the fourth lifting rod 2 passes through the first, second and third lifting platforms 1 from top to bottom and then is connected to the fourth lifting platform 1, the diameter of the through hole is larger than the diameter of the lifting rod 2, the length or telescopic stroke of the lifting rod 2 is adjusted according to the actual corresponding position of the lifting platform 1, and a connecting flange is provided at the driving end of the lifting rod 2, which is fixed to the corresponding lifting platform 1 through the connecting flange.

[0049] In an optional embodiment, the stirrup combing mechanism 3 is a plate-like structure and has a certain length. The stirrup combing mechanism 3 has a groove extending along the first direction and corresponding to the stirrup in the middle, and an inclined V-shaped mouth is provided at the opening of the groove to facilitate guiding the stirrup. The stirrup combing mechanism 3 is slidably assembled on the lifting platform 1 through the fourth slide bar, and is driven along the first direction by the fourth driving member 9.

[0050] In an optional embodiment, in order to facilitate the removal of the finished T-beam after welding, the main frame 18 straddles the two sides of the T-beam frame 21, and the corresponding two sides of the T-beam frame 21 are provided with guide rails 20 corresponding to the gantry frame. The main frame 18 is provided with a traveling mechanism, so that after the stirrup combing mechanism 3 and the longitudinal reinforcement combing mechanism 6 are retreated, they are driven by the traveling mechanism to move along the guide rails 20. After the main frame 18 is separated from the T-beam frame 21, the T-beam steel bars can be taken out by lifting equipment.

[0051] The traveling mechanism can be a servo motor or a hub motor, which is correspondingly arranged on the roller under the main frame 18 to meet the driving requirements. A distribution box 19 is provided on the outside of the main frame 18, and the traveling mechanism, stirrup combing mechanism 3, longitudinal reinforcement combing mechanism 6 and lifting rod 2 are correspondingly connected to the distribution box 19.

[0052] Specifically, a PLC controller or a PC control terminal is provided inside the distribution box 19 and is correspondingly connected to a display screen. Position sensors corresponding to the lifting platform 1 are provided on the main frame 18 and the conduit. The first driving member 12, the second driving member 22, the third driving member 17, the fourth driving member 9, the stepper motor, the servo motor and other driving components and sensing components designed in this application in this welding equipment are correspondingly connected to the PLC controller to realize automatic control.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A steel bar skeleton automatic point finding and clamping welding robot, characterized in that: include: Lifting platform; A base, the base being slidably assembled along a first direction and a second direction perpendicular to each other; A welding device is provided on the outside of the base, and longitudinal rib combing mechanisms are provided on both sides of the welding device. The two longitudinal rib combing mechanisms are symmetrically distributed on both sides of the welding device. The welding device includes a U-shaped welding piece, and welding heads corresponding to the points to be welded are provided at both ends of the U-shaped welding piece; The welding device is slidably assembled on the base along a first direction. In response to the longitudinal reinforcement combing mechanism combing the longitudinal reinforcement and squeezing it onto the stirrup to be welded, the welding device moves toward the intersection of the longitudinal reinforcement and the stirrup to weld and fix the longitudinal reinforcement and the stirrup.

2. The steel bar skeleton automatic point finding and pressing welding robot according to claim 1 is characterized in that: The lifting platform is plate-shaped, and a stirrup combing mechanism is provided on one side of the lifting platform opposite to the welding device. The stirrup combing mechanism is slidably assembled along a first direction to extend out of the lifting platform to correspond to the clamping stirrup.

3. The steel frame automatic point finding and pressing welding robot according to claim 1 is characterized in that: A concave installation station is provided on one side of the base away from the lifting platform. The welding device is slidably assembled on the installation station along a first direction through a first guide column, and the welding device is driven by a first driving member.

4. The steel bar skeleton automatic point finding and pressing welding robot according to claim 1 is characterized in that: The base is slidably assembled on the bottom plate via a first slide bar and is driven by a second driving member; The bottom plate is slidably assembled on the lifting platform via a second slide bar and is driven by a third driving member.

5. The steel bar skeleton automatic point finding and pressing welding robot according to claim 4 is characterized in that: The second driving member is connected to the base through a buffer member, and the buffer member includes two buffer plates distributed at intervals, and a plurality of second guide pillars are arranged between the two buffer plates. A push plate slidably assembled on the second guide pillars extends out of the base, and a buffer spring is arranged between the two buffer plates and the push plate.

6. The steel frame automatic point finding and pressing welding robot according to claim 1 is characterized in that: The longitudinal rib combing mechanism comprises two groups of rollers arranged along the second direction, and a guide groove corresponding to the longitudinal ribs and guiding the roller group is provided on a side of the roller group away from the welding device.

7. The steel bar skeleton automatic point finding and pressing welding robot according to claim 6 is characterized in that: Each group of rollers includes two rollers spaced apart in the longitudinal direction, and the two rollers are respectively arranged on both sides of the C-shaped member, one of the rollers is connected to a slide plate, and the slide plate is connected to the C-shaped member by an adjusting bolt to adjust the distance between the two rollers.

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