Roller drive mechanism

Abstract

The utility model provides a kind of roller transmission mechanism, including tensioning part, lifting part and transmission part, tensioning part and transmission part are located the same side of rack, the side plate of rack is equipped with connecting hole, transmission part includes driving sprocket, driven sprocket, first guide wheel, second guide wheel, driving sprocket is linked with lifting part, tensioning part is equipped with idler wheel and transmission part linkage, rack bottom is equipped with driving device, driving device includes transmission motor and motor gear, motor gear is connected with transmission part and idler wheel by chain, the utility model is through the automatic tension compensation of tensioning part and the multi-wheel system support layout of transmission part, servo motor, worm gear reducer and lifting rod combination of lifting part are closed loop control are used, finally through the linkage of transmission part and lifting part, it is realized without stopping to make roller adjust in various spacing range.

Description

Technical Field

[0001] This utility model proposes a roller transmission mechanism, which belongs to the field of new material calendering machinery. Background Technology

[0002] Traditional calenders use gear meshing for roller drive. However, due to the limitations of gear meshing, it cannot produce materials thicker than 8mm, resulting in low production efficiency. When producing materials thicker than 8mm, the roller lifting is restricted by the gear meshing, requiring machine shutdown for gear replacement. This makes product thickness adjustment inflexible and necessitates readjustment before production, further contributing to low efficiency. Therefore, a transmission mechanism that eliminates the need for machine shutdown and allows for a larger roller adjustment distance is needed. Utility Model Content

[0003] To address the technical problems existing in the prior art, this utility model proposes a roller transmission mechanism that enables large-range adjustment of the roller spacing without stopping the machine. The technical features adopted are as follows:

[0004] A roller drive mechanism includes a tensioning part, a lifting part, and a transmission part. The tensioning part and the transmission part are located on the same side of a frame. A connecting hole is provided on the side plate of the frame. The transmission part includes a driving sprocket, a driven sprocket, a first guide wheel, and a second guide wheel. The driving sprocket is linked to the lifting part, and the driven sprocket is connected to the lower roller. The tensioning part has an idler wheel that is linked to the transmission part. The first guide wheel is mounted on a horizontal sprocket frame on the side plate, and the second guide wheel is mounted on a vertical sprocket frame on the side plate. A drive device is provided at the bottom of the frame. The drive device includes a drive motor and a motor mount for fixing. The drive end of the drive motor has a motor gear, which is connected to the transmission part and the idler wheel via a chain. The driving sprocket, the first guide wheel, the motor gear, and the idler wheel are located inside the chain, while the driven sprocket and the second guide wheel are located outside the chain.

[0005] Preferably, the lifting unit includes an open lifting area flush with both sides of the frame, a lifting plate at the top of the lifting area, a servo motor at the top of the lifting plate, a worm gear reducer connected to the servo motor, the worm gear reducer connected to the lifting rod, the lifting rod passing through the lifting plate and bolted to the roller fixing frame through a support seat, a bearing seat in the middle of the roller fixing frame, a drive sprocket connected to the upper roller through the bearing seat, and a shock absorption device at the bottom of the roller fixing frame connected to the bottom frame of the lifting area.

[0006] Preferably, the shock absorption device includes a support base plate, and the support base plate is provided with a support rod with a shock absorption spring.

[0007] Preferably, an upper and lower limit device is installed on the side plate of one side of the lifting area. The upper and lower limit device includes a metal rod that is vertically fixed to the side plate. A set of adjustable baffles is provided on the metal rod. The baffles are provided with limiters that are connected to the PLC terminal.

[0008] Preferably, the inner sides of the lifting area are provided with a first linear slide rail, the roller fixing frame is provided with sliders on both sides that are movably connected to the first linear slide rail, and the top of the first linear slide rail is provided with a limiting block.

[0009] Preferably, a displacement sensor is also provided on one side of the first linear slide rail. The signal output terminal of the displacement sensor is connected to the PLC signal receiving terminal, and the servo motor control terminal is connected to the PLC instruction output terminal.

[0010] Preferably, the tensioning part includes a second linear slide rail fixed to the side plate, a metal slider on the second linear slide rail, a connecting hole on the metal slider for connection with an idler wheel, a metal block fixed in the extension direction of the linear slide rail, and the metal slider and the metal block respectively fixedly connected to both ends of the tension spring.

[0011] Preferably, the metal slider and the metal block are provided with 1-3 rows of connecting holes at intervals, and the connecting holes are fixed together with tension spring clips by bolts.

[0012] Preferably, the connecting hole of the metal slider and the metal block is provided with an internal threaded bushing, and the internal threaded bushing is rotatably connected to the lifting ring of the tension spring by bolts.

[0013] The beneficial effects of this utility model are as follows:

[0014] Through automatic tension compensation in the tensioning section and the multi-wheel support layout in the transmission section, the slippage rate of the chain drive is reduced to below 0.1%, the transmission efficiency is improved and stably controlled at over 96%, ensuring synchronous roller speed, avoiding workpiece conveying deviation or rolling accuracy deviation, and increasing production efficiency by 240%. The servo motor, worm gear reducer, and lifting rod of the lifting unit are combined and controlled in a closed loop to achieve lifting accuracy of 0.01mm, meeting the requirements of high-precision processing. The tension adjustment function of the tensioning unit overcomes the limitation of gear meshing pitch. When the distance between the upper and lower rollers reaches 50mm, the chain can still maintain stable tension. Compared with traditional fixed transmission mechanisms, the adjustable range of roller spacing is expanded, adapting to more calendering thickness specifications. Each component adopts a modular design. For example, the spring of the tensioning unit and the slider of the lifting unit can be disassembled and replaced individually, facilitating maintenance and repair. The design of the lifting unit's shock absorption device and double limit structure effectively buffers impacts and prevents overtravel, improving operational safety by more than 80%. The shock absorption device supports the roller frame and the weight of the rollers, preventing the lifting rod and servo motor from bearing excessive load, extending the service life of the servo motor, making the overall load distribution of the equipment more reasonable, and improving operational stability. Through the linkage of the tensioning unit, transmission unit, and lifting unit, the roller spacing can be adjusted without stopping the machine, and the adjustment range is much larger than that of conventional gear meshing methods. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a front structural diagram of the present utility model.

[0017] Figure 3 This is a schematic diagram of the side structure of the present invention. Figure 1 .

[0018] Figure 4 This is a schematic diagram of the side structure of the present invention. Figure 2 .

[0019] Figure 5 This is a schematic diagram of the side structure of the present invention. Figure 3 .

[0020] Figure 6 This is a side structural cross-sectional view of the present invention.

[0021] Among them, 1 is the tensioning part; 2 is the lifting part; 3 is the transmission part; 4 is the frame; 11 is the side plate; and 12 is the second linear slide rail.

[0022] 13. Metal slider; 14. Idler wheel; 15. Metal block; 16. Tension spring; 21. Lifting area; 210. Lifting plate;

[0023] 211, Servo motor; 212, Worm gear reducer; 213, Lifting rod; 214, Roller fixing frame; 215, Support base;

[0024] 216, bearing housing; 217, upper roller; 218, lower roller; 221, first linear guide rail; 222, slider;

[0025] 23, upper and lower limit devices; 231, metal rod; 232, baffle; 311, drive sprocket; 312, driven sprocket;

[0026] 313, First guide wheel; 314, Second guide wheel; 315, Horizontal sprocket frame; 316, Vertical sprocket frame;

[0027] 5. Drive unit; 51. Transmission motor; 52. Motor base; 53. Motor gear; 54. Chain. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments, but the present invention is not limited to the embodiments.

[0029] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and "vertical" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; or they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Furthermore, in the description of this utility model, unless otherwise stated, "multiple", "multiple groups", and "multiple roots" mean two or more.

[0032] Unless otherwise specified, the materials, instruments and methods used in the following embodiments are all conventional materials, instruments and methods in the art and can be obtained through commercial channels.

[0033] Example 1

[0034] like Figure 1As shown, the roller drive mechanism disclosed in this embodiment is mainly used in calendering production scenarios using new materials such as thermally conductive silicone. It can achieve flexible adjustment and stable transmission of the roller spacing and is suitable for calendering requirements of different thicknesses. The mechanism is installed on a steel frame 4, which is welded from steel plates. Side plates 11 with a thickness of 10 to 20 mm are symmetrically arranged on both sides of the frame. Assembly structures such as connection holes and displacement holes are precisely opened on the side plates 11 according to the installation requirements of each component. The machining accuracy of the holes is controlled within 0.05 mm to ensure the coaxiality and parallelism of each component after assembly.

[0035] The core of the roller drive mechanism consists of three parts: tensioning section 1, lifting section 2, and transmission section 3. Tensioning section 1 and transmission section 3 are located on the same side of the frame 4, concentrating most components on one side to improve the efficiency of daily maintenance and repair. Lifting sections 2 are symmetrically arranged on the side plates of both sides of the frame. Tensioning section 1, lifting section 2, and transmission section 3 form a linked transmission system via chain 54. A drive unit 5 is installed at the bottom of the frame 4 to provide power input to the entire transmission mechanism. Simultaneously, the mechanism is equipped with a PLC control system to automate functions such as lifting displacement monitoring and transmission tension adjustment. The overall structure is compact and rationally laid out, balancing transmission stability and ease of operation.

[0036] Example 2

[0037] This embodiment describes the transmission unit structure. Transmission unit 3 serves as the core of power transmission, and its structural design directly affects transmission efficiency and stability. Transmission unit 3 includes a driving sprocket 311, a driven sprocket 312, a first guide wheel 313, and a second guide wheel 314.

[0038] The drive sprocket 311 is linked to the upper roller 217 of the lifting unit 2 and is fixedly connected to the shaft end of the upper roller 217 by a flat key to ensure synchronous power transmission. The number of teeth of the drive sprocket 311 is set to 25 teeth according to the transmission ratio requirements, and the pitch is 25.4mm, which is compatible with chain specification 54.

[0039] Driven sprocket 312 is connected to lower roller 218. Driven sprocket 312 is mounted on the shaft end bearing seat of lower roller 218. Its number of teeth is consistent with that of drive sprocket 311 to ensure that the upper and lower rollers rotate synchronously and to avoid slippage or deviation during workpiece conveying.

[0040] The first guide wheel 313 is mounted on the sprocket frame 315 of the side plate 11. The sprocket frame 315 has a horizontal displacement hole, and the horizontal position of the first guide wheel 313 can be finely adjusted by adjusting the bolts, thereby optimizing the winding path of the chain 54. The depth and width of the guide wheel groove are matched with the diameter of the roller of the chain 54 to ensure stable fit of the chain.

[0041] The second guide wheel 314 is mounted on the sprocket frame 316 vertically arranged on the side plate 11. The sprocket frame 316 is connected to the side plate 11 by a flange fixing method. The verticality error is controlled within 0.1mm / m to ensure that the center height of the second guide wheel 314 and other transmission components is accurately matched.

[0042] In terms of transmission layout, the driving sprocket 311, the first guide wheel 313, the motor gear 53, and the idler wheel 14 are located inside the chain 54, while the driven sprocket 312 and the second guide wheel 314 are located outside the chain 54. This inside-outside distribution allows the chain 54 to form multiple support segments, reducing swaying during transmission. At the same time, the transmission path formed by the connecting lines of the centers of each gear train has been optimized through force analysis, and the wrap angle of the chain 54 is greater than 120°, ensuring sufficient friction and preventing chain slippage.

[0043] By precisely designing the structural parameters and layout of each sprocket and guide wheel, the transmission efficiency is effectively improved, reaching over 96%. The design of the horizontal displacement hole and the vertical sprocket frame facilitates fine-tuning of the guide wheel position according to actual transmission needs, adapting to the transmission requirements under different working conditions.

[0044] In addition, the drive unit 5 provides power to the transmission unit 3 and is mounted on the motor base 52 at the bottom of the frame 4. The motor base 52 is made of cast iron and its bottom is connected to the ground through a shock-absorbing pad to reduce the transmission of vibration during motor operation.

[0045] The drive motor 51 is a three-phase asynchronous motor with a rated power of 5.5kW and a rated speed of 1450r / min. The motor protection level is IP54, which is suitable for the dusty and oily environment of industrial workshops. The motor output shaft is connected to the motor gear 53 through a flexible coupling. The flexible coupling is made of polyurethane elastomer, which can compensate for the coaxiality error between the motor shaft and the gear shaft and reduce impact load.

[0046] The motor gear 53 is a spur gear with a module of 3 and 18 teeth, which meshes with the chain 54 for transmission. The gear has a precision grade of 6 and a tooth surface roughness Ra≤0.8μm to reduce meshing noise. The motor base 52 is provided with an elongated hole, which can be used to finely adjust the meshing clearance between the motor gear 53 and the chain 54 by adjusting the motor position to ensure precise meshing.

[0047] The three-phase asynchronous motor power is adaptable to meet the transmission requirements under different loads; the flexible coupling and elongated hole design improve transmission stability from the aspects of shock buffering and meshing clearance adjustment, respectively; the IP54 protection rating and shock-absorbing pad design enhance the motor's ability to adapt to harsh environments, while reducing the impact of vibration on the frame and other components.

[0048] Example 3

[0049] This embodiment features a lifting mechanism. The lifting mechanism 2 is used to adjust the distance between the upper roller 217 and the lower roller 218, adapting to the processing of workpieces of different thicknesses. Its structural design balances lifting accuracy and operational stability. Specific implementation details are as follows:

[0050] Square openings are provided on the side plates 11 on both sides of the frame 4 to serve as lifting areas 21. The lifting areas on the two side plates 11 are symmetrical and flush. A lifting plate 210 is fixed at the top of the lifting area 21. A servo motor 211 and a worm gear reducer 212 are installed at the top of the lifting plate 210. The servo motor 211 is a servo motor with a rated torque of 10 N·m and a positioning accuracy of less than 0.01 mm. The worm gear reducer 212 has a reduction ratio of 1:50. The two are connected by a flange to provide precise power for lifting.

[0051] The output end of the worm gear reducer 212 is connected to the lifting rod 213, which is a ball screw to ensure high precision in lifting displacement. After passing through the lifting plate 210, the lifting rod 213 is bolted to the roller fixing frame 214 through the support seat 215. In order to reduce the friction when the lifting rod 213 rotates, a thrust bearing is also installed in the support seat 215. The roller fixing frame 214 is made of hollow rectangular steel plate, and the hollow part of the frame is equipped with a bearing seat 216. The drive sprocket 311 is connected to the upper roller 217 through the bearing seat 216. A deep groove ball bearing is installed in the bearing seat 216 to ensure that the upper roller 217 rotates flexibly.

[0052] The bottom of the roller fixing frame 214 is also equipped with a shock-absorbing device, which includes a support base plate. The support base plate is fixed to the bottom frame of the lifting area 21 by bolts. Two support rods are connected to the support base plate. The support rods are fitted with shock-absorbing springs. The bottom of the roller fixing frame 214 has through holes corresponding to the positions of the support rods. The support rods pass through the through holes, and the roller fixing frame 214 presses on the shock-absorbing springs to achieve a movable connection.

[0053] The first linear slide rail 221 is fixed to the two inner sides of the lifting area 21 by bolts. The length of the slide rail is set according to the lifting stroke. Slider 222 is installed on both sides of the roller fixing frame 214. The slider 222 slides with the first linear slide rail 221. The sliding gap is controlled between 0.02 and 0.05 mm to ensure that the roller fixing frame 214 is lifted horizontally on both sides and avoids tilting. A limit block is provided at the top of the first linear slide rail 221 to prevent the slider 222 from hitting the end of the slide rail due to overtravel.

[0054] Upper and lower limit devices 23 are installed on the side plate 11 on one side of the lifting area 21. The limit device includes a metal rod 231 vertically fixed on the side plate 11. A pair of adjustable baffles 232 are sleeved on the metal rod 231. The baffles 232 are equipped with limit switches connected to the PLC terminal. The limit switches can be selected as limit switches, proximity sensors or photoelectric sensors. The limit switches are connected to the PLC terminal. By adjusting the position of the baffles 232 on the metal rod 231, the upper and lower limit positions of the lifting can be set. When the roller fixing frame 214 approaches the baffle, the sensor signal is received by the PLC. Then the servo motor 211 receives the control command and stops running, realizing the safety limit.

[0055] In addition, a displacement sensor is installed on one side of the first linear guide rail 221. The measurement accuracy of the displacement sensor is controlled within 0.005mm. The signal output terminal of the displacement sensor is connected to the signal receiver of the PLC via a Bluetooth device. The control terminal of the servo motor 211 is connected to the command output terminal of the PLC, forming a closed-loop control circuit. During operation, the displacement sensor detects the lifting displacement of the roller fixing frame 214 in real time and feeds the data back to the PLC. The PLC compares the set displacement with the actual displacement. If there is a deviation, it immediately sends a command to adjust the speed and direction of the servo motor 211 to ensure accurate lifting displacement.

[0056] The lifting unit, through a combination of a servo motor and a ball screw, achieves a lifting displacement accuracy within 0.01mm, meeting the requirements of high-precision machining. The shock absorption device can buffer the impact load during the lifting process, while supporting the weight of the roller frame and rollers, preventing the lifting rod 213 from bearing excessive load and extending its service life. The cooperation between the first linear slide rail and the slider ensures that the frame lifts and lowers horizontally, preventing misalignment of the upper and lower rollers. The closed-loop control of the displacement sensor and PLC enables real-time monitoring and automatic adjustment of the lifting displacement, reducing manual intervention. The dual protection of the upper and lower limit devices and the slide rail limit blocks prevents overtravel and improves operational safety.

[0057] Example 4

[0058] Example 4 is a tensioning structure used to adjust the tension of the chain 54, ensuring that the transmission unit 3 can still transmit power stably after the lifting unit 2 adjusts the roller spacing. The specific implementation is as follows:

[0059] The tensioning part 1 includes a second linear slide rail 12 fixed on the side plate 11. The installation accuracy of the second linear slide rail 12 is controlled within 0.02mm / m of parallelism to ensure smooth sliding of the slider. A metal slider 13 is installed on the second linear slide rail 12. The metal slider 13 is made of aluminum alloy and has an anodized surface to improve wear resistance. A connecting hole is opened on the metal slider 13 to connect with the idler wheel 14. The idler wheel 14 is a shaft gear. The number of teeth and pitch of the idler wheel 14 are the same as those of the drive sprocket 311 to ensure precise meshing with the chain 54.

[0060] A metal block 15 is fixed on the side plate 11 extending from the second linear guide rail 12. One to three rows of connecting holes are spaced apart on the metal slider 13 and the metal block 15. Internally threaded bushings are installed in the connecting holes. Lifting rings are provided at both ends of the tension spring 16, and these rings are connected to the internally threaded bushings by bolts. Tightening the bolts achieves rigid fixation of the tension spring 16. The tension spring 16 is made of steel wire. In actual use, the initial tension of the tension spring 16 can be changed by adjusting the assembly position of the bolts in different connecting holes, thereby adjusting the tension. For fine-tuning of the tension, the bolts can be rotated to move the internally threaded bushings axially, changing the spring's extension length and achieving precise tension adjustment.

[0061] The high-precision second linear guide in the tensioning section ensures that the idler wheel 14 moves in a fixed direction, preventing deviation from affecting chain engagement; the design of multiple rows of connecting holes and adjustable bolts enables multiple tension levels and fine adjustments to adapt to different transmission conditions; the automatic tension compensation function of the tension spring can absorb vibration and slack during chain transmission, ensuring that the chain is always under tension; the rigid fixing method of the internal threaded bushing and bolts prevents the spring ring from falling off, improving structural safety.

[0062] The working process of the roller drive mechanism is as follows:

[0063] 1. Initial debugging: Based on the thickness of the workpiece to be processed, the target lifting displacement of the upper roller 217 is set by the PLC; the position of the connecting hole of the tension spring 16 of the tensioning part 1 is adjusted so that the initial tension of the chain 54 is in a suitable range. The tension value is controlled between 150 and 200N by the tension gauge.

[0064] 2. Lifting and Adjustment: Start the servo motor 211, which drives the lifting rod 213 to rotate through the worm gear reducer 212, thereby driving the roller fixing frame 214 to rise and fall along the first linear slide rail 221; the displacement sensor detects the displacement data in real time and feeds it back to the PLC. The PLC compares the target displacement with the actual displacement, adjusts the operation of the servo motor 211, and calibrates it with a feeler gauge until the upper roller 217 reaches the target position.

[0065] 3. Transmission Operation: Start the drive motor 51 of the drive device 5. The motor gear 53 drives the drive sprocket 311 and the driven sprocket 312 to rotate through the chain 54, thereby driving the upper roller 217 and the lower roller 218 to rotate synchronously. During operation, if the chain 54 becomes loose due to vibration or wear, the tension spring 16 of the tensioning part 1 pulls the metal slider 13 to move along the second linear slide rail 12, driving the idler wheel 14 to approach the chain 54 to compensate for the looseness and keep the chain tensioned.

[0066] 4. Safety protection: If the roller fixing frame 214 approaches the baffle 232 of the upper and lower limit device 23 during the lifting process, the proximity sensor sends a signal to the PLC, and the servo motor 211 stops immediately; if the displacement sensor detects a displacement deviation exceeding 0.02mm, the PLC automatically adjusts the servo motor 211 to correct the displacement deviation.

[0067] While the foregoing has disclosed preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the claims. Furthermore, the methods or software programs involved in the debugging and control of the PLC control device and sensors in this invention are all developed by those skilled in the art based on existing methods or software programming books, manuals, or product specifications, combined with the principles and effects of the present invention, and can be implemented through independent programming.

Claims

1. A roller drive mechanism, comprising a tensioning part (1), a lifting part (2), and a transmission part (3), characterized in that, The tensioning part (1) and the transmission part (3) are located on the same side of the frame (4). The side plate (11) of the frame (4) is provided with a connecting hole. The transmission part (3) includes a driving sprocket (311), a driven sprocket (312), a first guide wheel (313), and a second guide wheel (314). The driving sprocket (311) is linked with the lifting part (2), and the driven sprocket (312) is connected with the lower roller (218). The tensioning part (1) is provided with an idler wheel (14) which is linked with the transmission part (3). The first guide wheel (313) is mounted on the horizontal sprocket frame (315) of the side plate (11), and the second guide wheel (314) is mounted on the horizontal sprocket frame (315) of the side plate (11). 314) is mounted on the vertical sprocket frame (316) of the side plate (11). The bottom of the frame (4) is provided with a drive device (5). The drive device (5) includes a drive motor (51) and a motor base (52) for fixing. The drive end of the drive motor (51) is provided with a motor gear (53). The motor gear (53) is connected to the transmission part (3) and the idler wheel (14) through the chain (54). The drive sprocket (311), the first guide wheel (313), the motor gear (53), and the idler wheel (14) are located inside the chain, while the driven sprocket (312) and the second guide wheel (314) are located outside the chain.

2. The roller transmission mechanism as described in claim 1, characterized in that, The lifting unit (2) includes a lifting area (21) with the two side plates (11) of the frame (4) flush. The top of the lifting area (21) is provided with a lifting plate (210). The top of the lifting plate (210) is provided with a servo motor (211). The servo motor (211) is connected to a worm gear reducer (212). The worm gear reducer (212) is connected to a lifting rod (213). The lifting rod (213) passes through the lifting plate (213) and is bolted to the roller fixing frame (214) through a support seat (215). The roller fixing frame (214) is provided with a bearing seat (216) in the middle. The drive sprocket (311) is connected to the upper roller (217) through the bearing seat (216). The bottom of the upper roller frame (214) is provided with a shock absorption device connected to the bottom frame of the lifting area (21).

3. The roller transmission mechanism as described in claim 2, characterized in that, A vertical limit device (23) is installed on the side plate (11) on one side of the lifting area (21). The vertical limit device includes a metal rod (231) vertically fixed on the side plate (11). A set of adjustable baffles (232) are provided on the metal rod. A limiter connected to the PLC terminal is provided on the baffle (232).

4. The roller transmission mechanism as described in claim 3, characterized in that, The shock absorption device includes a support base plate, on which a support rod with a shock absorption spring is provided.

5. A roller transmission mechanism as described in claim 4, characterized in that, The lifting area (21) is provided with a first linear slide rail (221) on both sides of the inner side. The roller fixing frame (214) is provided with sliders (222) on both sides, which are movably connected to the first linear slide rail (221). The top of the first linear slide rail (221) is provided with a limiting block.

6. A roller transmission mechanism as described in claim 5, characterized in that, A displacement sensor is also provided on one side of the first linear slide rail (221). The signal output terminal of the displacement sensor is connected to the signal receiving terminal of the PLC, and the control terminal of the servo motor (211) is connected to the instruction output terminal of the PLC.

7. The roller transmission mechanism as described in claim 1, characterized in that, The tensioning part (1) includes a second linear slide rail (12) fixed to the side plate (11). The second linear slide rail (12) is provided with a metal slider (13). The metal slider is provided with a connecting hole and connected to the idler wheel (14). A metal block (15) is fixed in the extension direction of the second linear slide rail (12). The metal slider (13) and the metal block (15) are connected to both ends of the tension spring (16).

8. A roller transmission mechanism as described in claim 7, characterized in that, The metal slider (13) and the metal block (15) are provided with 1-3 rows of connecting holes at intervals, and the connecting holes are engaged and fixed with the tension spring (16) by bolts.

9. A roller transmission mechanism as described in claim 8, characterized in that, The metal slider (13) and the metal block (15) are provided with internal thread bushings in their connecting holes. The internal thread bushings are fixedly connected to the lifting ring of the tension spring (16) by rotating the bolts.

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