A transmission device for a pipe bending machine

Abstract

The utility model discloses a kind of transmission devices for pipe bender, it is related to pipe bender transmission technical field, including substrate, the top of the substrate is fixedly installed with guide rail, the inside of the guide rail is movably installed with displacement mechanism, the top of the displacement mechanism is fixedly installed with installation component, the top of the displacement mechanism is installed with clamping mechanism by installation component. The utility model adopts the above structure, the pipe bender transmission device of the present application adopts gear rack drive and encoder closed-loop control, compared with traditional screw rod transmission, more efficient and wear-resistant, can accurately control slider displacement, guarantee feeding accuracy to meet the high-precision pipe bending demand, clamping mechanism is driven sliding block synchronous centering clamping by screw rod reverse thread, combined with pressure sensor monitoring, can be adapted to different pipe diameter pipe material and constant clamping force, avoid skid deformation, significantly improve processing yield, and its modular design is convenient for quick repair and maintenance.

Description

Technical Field

[0001] This utility model belongs to the field of pipe bending machine transmission technology, and specifically relates to a transmission device for a pipe bending machine. Background Technology

[0002] Currently, in the field of industrial pipe processing, pipe bending machines are widely used as key equipment in power construction, railway and highway construction, boiler manufacturing and other scenarios. Their types include CNC pipe bending machines, hydraulic pipe bending machines, etc. Among them, hydraulic pipe bending machines occupy a dominant position in the domestic market due to their advantages such as diverse functions, reasonable structure, simple operation and low price. In addition, some models can use the oil cylinder as a hydraulic jack, further expanding the application scenarios.

[0003] As the application scope of pipe bending machines expands, the technical defects of their feeding devices have gradually become apparent. Existing feeding devices generally suffer from insufficient operational stability, and tilting easily occurs during material conveying, directly affecting the accuracy of pipe bending. Simultaneously, the feeding distance cannot be precisely controlled, unreasonable clamping structure design leads to operational inconvenience, and inaccurate clamping force also causes processing errors. Although patent publication number "CN211888546U" discloses a feeding transmission device that improves feeding stability and clamping accuracy through structures such as electric push rods, rangefinders, and pressure sensors, this device still has significant shortcomings: when electronic components fail, the entire clamping module must be disassembled for repair and replacement, which is not only time-consuming and labor-intensive but may also affect positioning accuracy due to repeated disassembly and reassembly; furthermore, the fixed structure often requires replacing the entire clamping assembly when a single component fails, increasing maintenance costs; in addition, the fixed structure cannot quickly switch clamps when processing different specifications of pipes, affecting production flexibility, and long-term clamp deformation can accumulate assembly errors. Therefore, the existing technology has certain defects and shortcomings, necessitating improved design. Utility Model Content

[0004] In view of the problems mentioned in the background art, the purpose of this utility model is to provide a transmission device for a pipe bending machine to solve the problems raised in the background art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A transmission device for a pipe bending machine includes a base plate, a guide rail fixedly mounted on the top of the base plate, a displacement mechanism movably mounted inside the guide rail, an installation assembly fixedly mounted on the top of the displacement mechanism, and a clamping mechanism mounted on the top of the displacement mechanism via the installation assembly.

[0007] The displacement mechanism includes a slider and a rack. The slider is slidably connected to the inside of the guide rail. The rack is fixedly installed on the top side of the guide rail. A connecting arm is fixedly installed on one side of the slider. A gear is rotatably connected to the bottom of the connecting arm. A connecting frame is fixedly installed at the outer end of the connecting arm. A first motor is fixedly installed at the bottom of the connecting frame. The output end of the first motor passes through the connecting frame and is fixedly connected to the bottom of the gear. The gear and the rack are meshed together. An encoder is provided on the first motor.

[0008] As a preferred technical solution, the mounting assembly includes a mounting block and a mounting sleeve. The mounting sleeve is fixedly installed at the bottom center of the clamping mechanism, and the mounting block is fixedly installed at the top of the slider. The top of the mounting block is inserted into the interior of the mounting sleeve. The lower ends of both sides of the mounting sleeve are threaded with mounting screws, and the ends of the mounting screws penetrate the mounting sleeve.

[0009] As a preferred technical solution, limit holes are provided on both upper ends of the mounting block, and the end of the mounting screw is inserted into the limit hole.

[0010] As a preferred technical solution, the mounting screw is a hand-tightening screw, the top view shape of the mounting block and the internal bottom view shape of the mounting sleeve are both set to square, and the side shape of the slider and the cross-sectional shape of the internal cavity of the guide rail are both set to convex shape.

[0011] As a preferred technical solution, mounting holes are provided at both the front and rear ends of both sides of the substrate, and the mounting holes are countersunk holes.

[0012] As a preferred technical solution, the clamping mechanism includes a top plate, which is fixedly installed on the top of the mounting sleeve. A bottom rail is fixedly installed in the middle of the top plate. A second motor is fixedly installed at one end of the bottom rail. A lead screw is fixedly installed through the bottom rail at the output end of the second motor. The lead screw is rotatably connected to the inside of the bottom rail. The two ends of the lead screw have opposite thread directions. Sliding blocks are threaded to both ends of the lead screw. The sliding blocks are slidably connected to the inside of the bottom rail. A clamping plate is installed on the top of each sliding block.

[0013] As a preferred technical solution, a pressure sensor is fixedly connected to the top of one sliding block, and a clamping plate near the pressure sensor is connected to the detection end of the pressure sensor. Another clamping plate is fixedly connected to the top of another sliding block, and anti-slip protrusions are fixedly connected at equal intervals on the inner side of the clamping plate.

[0014] In summary, the present invention has the following main advantages:

[0015] First, the transmission device of this pipe bending machine adopts gear and rack transmission and encoder closed-loop control, which is more efficient and wear-resistant than traditional screw transmission. It can accurately control the slider displacement, ensuring feeding accuracy to meet the needs of high-precision pipe bending. The clamping mechanism drives the sliding block to synchronously center and clamp through the reverse thread of the screw. Combined with pressure sensor monitoring, it can adapt to different pipe diameters and maintain a constant clamping force, avoiding slippage and deformation, and significantly improving the processing yield. The convex slider and guide rail cooperation and anti-slip protrusion design enhance the stability of operation and reduce damage to the pipe surface.

[0016] Secondly, this device adopts a modular design. The hand-tightening installation screw, combined with the square cross-section installation block and sleeve, allows for quick assembly and disassembly of the clamping mechanism without tools, significantly reducing maintenance difficulty and time costs. The displacement mechanism and clamping mechanism can slide out as a whole along the guide rail for easy maintenance. The countersunk mounting hole on the base plate facilitates fixing to the main body of the pipe bending machine. The modular structure allows it to be adapted to various models of pipe bending machines. In addition, the gear and rack transmission is easy to maintain and has low replacement costs. The encoder provides real-time monitoring and alarm, effectively extending the service life of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a top view of the structure of this utility model;

[0019] Figure 3 This is a bottom view of the mounting components and clamping mechanism of this utility model;

[0020] Figure 4 This is a top view of the installation components and clamping mechanism of this utility model.

[0021] Reference numerals: 1. Base plate; 2. Guide rail; 3. Displacement mechanism; 31. Slider; 32. Rack; 33. Connecting arm; 34. Gear; 35. Connecting frame; 36. First motor; 4. Mounting assembly; 41. Mounting sleeve; 42. Mounting block; 43. Mounting screw; 44. Limiting hole; 5. Clamping mechanism; 51. Top plate; 52. Bottom rail; 53. Second motor; 54. Lead screw; 55. Sliding block; 56. Clamping plate; 57. Pressure sensor; 58. Anti-slip protrusion; 6. Mounting hole. Detailed Implementation

[0022] Example

[0023] refer to Figures 1 to 4 A transmission device for a pipe bending machine according to this embodiment includes a base plate 1, a guide rail 2 fixedly mounted on the top of the base plate 1, a displacement mechanism 3 movably mounted inside the guide rail 2, an installation assembly 4 fixedly mounted on the top of the displacement mechanism 3, and a clamping mechanism 5 mounted on the top of the displacement mechanism 3 through the installation assembly 4.

[0024] The displacement mechanism 3 includes a slider 31 and a rack 32. The slider 31 is slidably connected to the inside of the guide rail 2. The rack 32 is fixedly installed on the top side of the guide rail 2. A connecting arm 33 is fixedly installed on one side of the slider 31. A gear 34 is rotatably connected to the bottom of the connecting arm 33. A connecting frame 35 is fixedly installed on the outer end of the connecting arm 33. A first motor 36 is fixedly installed on the bottom of the connecting frame 35. The output end of the first motor 36 passes through the connecting frame 35 and is fixedly connected to the bottom of the gear 34. The gear 34 and the rack 32 are meshed. An encoder is provided on the first motor 36. When the transmission device of this pipe bending machine is working, after the first motor 36 starts, its output end drives the gear 34 to rotate. Since the gear 34 is fixed to the top side of the guide rail 2, the gear 34 rotates. The rack 32 on one side of the top of the rail 2 meshes, and the rotational motion of the gear 34 is converted into the linear motion of the slider 31 along the direction of the guide rail 2. The slider 31 and the guide rail 2 are connected by a sliding connection, and the side shape of the slider 31 and the cross-sectional shape of the internal cavity of the guide rail 2 are both set as convex. This design ensures that the slider 31 can only move in the direction of the guide rail 2, avoiding lateral swaying. At the same time, the encoder on the first motor 36 provides real-time feedback on the rotation of the output shaft. This feedback signal is converted into the actual displacement by the controller, thereby realizing closed-loop control of the positioning accuracy of the slider 31. This allows the slider 31 to accurately transport the clamping mechanism 5 to the designated position, meeting the precise requirements of the pipe bending machine for the position of the pipe at different processing stages.

[0025] refer to Figures 3-4The mounting assembly 4 includes a mounting block 42 and a mounting sleeve 41. The mounting sleeve 41 is fixedly installed at the bottom center of the clamping mechanism 5, and the mounting block 42 is fixedly installed at the top of the slider 31. The top of the mounting block 42 is inserted into the interior of the mounting sleeve 41. The lower ends of both sides of the mounting sleeve 41 are threaded with mounting screws 43, and the ends of the mounting screws 43 penetrate the mounting sleeve 41. Limiting holes 44 are opened at the upper ends of both sides of the mounting block 42, and the ends of the mounting screws 43 are inserted into the limiting holes 44. The mounting screws 43 are hand-tightening screws. The top view shape of the mounting block 42 and the bottom view shape of the mounting sleeve 41 are both square. The side shape of the slider 31 and the cross-sectional shape of the internal cavity of the guide rail 2 are both convex. Mounting holes 6 are opened at both the front and rear ends of both sides of the base plate 1. The mounting holes 6 are countersunk holes. In this pipe bending machine transmission device, the mounting assembly 4 realizes the quick installation and disassembly of the clamping mechanism 5 and the displacement mechanism 3 through a specific structure. During installation and removal, the square mounting block 42 fixed to the top of the slider 31 is inserted into the square mounting sleeve 41 at the bottom of the clamping mechanism 5, ensuring a tight fit between the two and preventing relative rotation during torque transmission. Subsequently, the operator rotates the hand-tightening mounting screw 43 so that its end passes through the mounting sleeve 41 and is inserted into the limiting holes 44 on both sides of the mounting block 42, achieving axial locking and thus firmly installing the clamping mechanism 5 on the slider 31. During disassembly, simply rotate the hand-tightening screw in the opposite direction to disengage it from the limiting holes 44, and the mounting block 42 can be easily pulled out of the mounting sleeve 41, completing the separation of the clamping mechanism 5 without the need for tools. In addition, the U-shaped slider 31 cooperates with the guide rail 2 to provide good guidance and stability, preventing deviation during operation. The countersunk mounting holes 6 on both sides of the base plate 1 facilitate the use of bolts to fix the entire transmission device to the pipe bending machine body. The countersunk design prevents the bolt heads from protruding and affecting the installation and operation of other components.

[0026] refer to Figures 1-4The clamping mechanism 5 includes a top plate 51, which is fixedly installed on the top of the mounting sleeve 41. A bottom rail 52 is fixedly installed in the middle of the top plate 51. A second motor 53 is fixedly installed at one end of the bottom rail 52. A lead screw 54 is fixedly installed through the bottom rail 52 at the output end of the second motor 53. The lead screw 54 is rotatably connected to the inside of the bottom rail 52. The two ends of the lead screw 54 have opposite threads. Sliding blocks 55 are threaded to both ends of the lead screw 54. The sliding blocks 55 are slidably connected to the inside of the bottom rail 52. A clamping plate 56 is installed on the top of each sliding block 55. A pressure sensor 57 is fixedly connected to the top of one sliding block 55. The clamping plate 56 near the pressure sensor 57 is connected to the detection end of the pressure sensor 57. The other clamping plate 56 is fixedly connected to the top of the other sliding block 55. Anti-slip protrusions 58 are fixedly connected at equal intervals on the inner side of the clamping plate 56. During the application of this device, its clamping mechanism 5 operates... When the pipe is in motion, the second motor 53 starts, and its output end drives the lead screw 54 to rotate within the bottom rail 52. Since the threads at both ends of the lead screw 54 rotate in opposite directions, the two sliding blocks 55 connected to it will slide synchronously towards or away from each other within the bottom rail 52. When the sliding blocks 55 move towards each other, the clamping plate 56 at the top gradually approaches the pipe. The anti-slip protrusions 58 on the inner side of the clamping plate 56 contact the surface of the pipe and generate friction to prevent the pipe from sliding during clamping. At the same time, the pressure sensor 57, which is fixedly connected to the top of one of the sliding blocks 55, monitors the clamping force in real time. When the pressure reaches the preset threshold, it indicates that the pipe has been firmly clamped. At this time, the controller issues a command to brake and stop the second motor 53. When it is necessary to release the pipe, the second motor 53 rotates in the opposite direction, the two sliding blocks 55 slide away from each other, the clamping plate 56 separates, and the pipe is released. In this way, the clamping mechanism 5 can automatically adapt to pipes of different diameters and achieve stable and precise clamping operations.

[0027] Operating principle and advantages: During application, the first motor 36 achieves closed-loop control through an encoder, driving the gear 34 to rotate. The gear 34 meshes with the rack 32 fixed on the top of the guide rail 2, converting the rotational motion into linear motion. The slider 31 and the guide rail 2 are fitted with a convex cross-section to ensure that the slider 31 only moves along the direction of the guide rail 2, avoiding lateral swaying. The encoder provides real-time feedback on the rotation of the output shaft, which is converted into the actual displacement by the controller, ensuring the positioning accuracy of the slider 31. When it is necessary to disassemble or assemble the entire displacement mechanism 3 and clamping mechanism 5, only the rack 32 and slider 3 need to be driven. 1. Slide out from one end of guide rail 2, allowing for quick assembly and disassembly of displacement mechanism 3 and clamping mechanism 5. During use, when the second motor 53 drives the lead screw 54 to rotate, the two sliding blocks 55 move synchronously towards or away from each other due to the opposite thread directions at both ends of the lead screw 54. When the sliding blocks 55 approach each other, the anti-slip protrusions 58 on the inner side of the clamping plate 56 contact the pipe surface. The pressure sensor 57 monitors the clamping force in real time. When the set threshold is reached, the second motor 53 stops operating, completing the pipe clamping. The anti-slip protrusions 58 increase the coefficient of friction, preventing the pipe from sliding during bending. The design of its lead screw 54 driving the slider 31 to reciprocate allows it to stably clamp pipes of different sizes. During use, the mounting block 42 and the mounting sleeve 41 use a square cross-section to ensure no relative rotation during torque transmission. The hand-tightening mounting screw 43 is screwed into the limiting hole 44 of the mounting block 42 to achieve axial locking. For disassembly, loosening the screw quickly separates the clamping mechanism 5 from the slider 31 without tools. When it is necessary to remove the clamping mechanism 5 separately, simply turning the hand-tightening mounting screw 43 quickly removes the mounting block 42 from the mounting sleeve. The internal removal of tube 41 facilitates quick inspection and maintenance of the entire device. When bending is required, the displacement mechanism 3 transports the clamped tube to the designated position, and the encoder ensures feeding accuracy. The clamping mechanism 5 adjusts the clamping force according to the tube diameter, and the pressure sensor 57 ensures that the clamping force is constant. After bending is completed, the displacement mechanism 3 transports the tube to the next station. The entire process is automatically executed by the controller through a preset program. All modules work together. The modular design of IQ allows the clamping mechanism 5 to be quickly disassembled and replaced, facilitating the quick assembly and disassembly of the displacement mechanism 3 and the clamping mechanism 5, and making subsequent maintenance convenient.

[0028] The gear 34 and rack 32 transmission efficiency is superior to the traditional lead screw 54 transmission, and it is less prone to accuracy degradation due to wear. Encoder closed-loop control ensures feeding positioning accuracy, meeting the requirements of high-precision pipe bending. The clamping mechanism 5 achieves synchronous centering and clamping through the reverse threads at both ends of the lead screw 54, automatically adapting to pipes of different diameters. Pressure sensor 57 ensures constant clamping force, avoiding slippage or deformation caused by changes in pipe material or diameter, thus improving the processing yield. The hand-tightening installation screw 43 design allows operators to change the clamps without tools, reducing reliance on professional maintenance personnel. The square cross-section installation block 42 and sleeve provide a foolproof design, ensuring the correct installation direction. The convex slider 31 cooperates with the guide rail 2 to provide good anti-overturning energy. Even under high-speed motion or eccentric load on the pipe, it can maintain stable operation. The anti-slip protrusions 58 make the pipe clamping force distribution more uniform, reducing surface damage caused by local stress concentration. The countersunk mounting holes 6 on both sides of the base plate 1 facilitate quick fixation with the main body of the pipe bending machine and prevent the bolt head from protruding and affecting the installation of other components. The modular structure allows the transmission device to be used as a standard component to adapt to different models of pipe bending machines, improving the equipment's versatility. The wear of the gear 34 and rack 32 transmission is mainly concentrated on the tooth surface. The service life can be extended through regular lubrication and maintenance. Moreover, the cost of replacing the gear 34 is much lower than replacing the entire lead screw 54. The encoder monitors the displacement accuracy in real time and alarms in time when the deviation exceeds the threshold, avoiding equipment damage caused by the accumulation of transmission errors.

[0029] The base plate 1 is made of Q235 steel plate with a thickness of 10-15mm. The countersunk mounting holes 6 on both sides have a diameter of 8-10mm and are compatible with M6-M8 bolts for fixing. The guide rail 2 is a 20-30mm linear guide rail, with a length of 500-1000mm set according to the bending stroke. The internal cavity cross-section is convex, which, together with the convex slider 31 with a width of 40-60mm, achieves stable sliding. The rack 32 has a module of 2-3 and a length matching the guide rail 2. The gear 34 has 20-30 teeth and meshes with the rack 32 for transmission. It is installed in component 4. Square mounting block 42 / sleeve side length 30-40mm, hand-tightening mounting screw 43 diameter 6-8mm, limiting hole 44 diameter matching screw size, clamping mechanism 5 bottom rail 52 length 300-500mm, lead screw 54 lead 5-10mm, reverse threads at both ends, sliding block 55 adjustable spacing range 50-200mm, clamping plate 56 inner anti-slip protrusion 58 height 2-3mm, pressure sensor 57 range 0-500N, in terms of electronic components, the first motor 36 is a servo motor such as Panasonic MINA. The SA6 series MSMD042G1U has a power of 0.4kW and a rated torque of 1.27N·m. It is equipped with an MDDDT5540 driver and a 20-bit incremental encoder with a resolution of 1,048,576 pulses / revolution. The second motor 53 is a servo motor from the same series with a power of 0.2-0.4kW. The lead screw 54 is driven by a ball screw with a lead of 5mm and a precision of C7 class. The controller is a Siemens S7-1200CPU1214CDC / DC / DC, with 14 digital inputs and 10 outputs. Supporting PROFINET and EtherCAT communication, it is installed in the electrical control box of the pipe bending machine body. It connects to the drivers of the first motor 36 and the second motor 53, as well as the pressure sensor 57 (model HC201) via EtherCAT bus. The range is 0-500N, and the output is 4-20mA. The power supply method is as follows: the servo motor is powered by AC380V industrial power supply stepped down to AC220V by a transformer. The controller and sensor use Mean Well NES-100-24 DC24V switching power supply to ensure the stability of the control circuit.

Claims

1. A transmission device for a pipe bending machine, characterized in that: Includes a base plate (1), a guide rail (2) is fixedly mounted on the top of the base plate (1), a displacement mechanism (3) is movably mounted inside the guide rail (2), an installation assembly (4) is fixedly mounted on the top of the displacement mechanism (3), and a clamping mechanism (5) is mounted on the top of the displacement mechanism (3) through the installation assembly (4). The displacement mechanism (3) includes a slider (31) and a rack (32). The slider (31) is slidably connected to the inside of the guide rail (2). The rack (32) is fixedly installed on the top side of the guide rail (2). A connecting arm (33) is fixedly installed on one side of the slider (31). A gear (34) is rotatably connected to the bottom of the connecting arm (33). A connecting frame (35) is fixedly installed on the outer end of the connecting arm (33). A first motor (36) is fixedly installed on the bottom of the connecting frame (35). The output end of the first motor (36) passes through the connecting frame (35) and is fixedly connected to the bottom of the gear (34). The gear (34) and the rack (32) are meshed together. An encoder is provided on the first motor (36). The mounting assembly (4) includes a mounting block (42) and a mounting sleeve (41). The mounting sleeve (41) is fixedly mounted at the bottom center of the clamping mechanism (5). The mounting block (42) is fixedly mounted at the top of the slider (31). The top of the mounting block (42) is inserted into the interior of the mounting sleeve (41). The lower ends of both sides of the mounting sleeve (41) are threaded with mounting screws (43). The ends of the mounting screws (43) penetrate the mounting sleeve (41). The clamping mechanism (5) includes a top plate (51), which is fixedly installed on the top of the mounting sleeve (41). A bottom rail (52) is fixedly installed in the middle of the top plate (51). A second motor (53) is fixedly installed at one end of the bottom rail (52). A lead screw (54) is fixedly installed through the bottom rail (52) at the output end of the second motor (53). The lead screw (54) is rotatably connected to the inside of the bottom rail (52). The two ends of the lead screw (54) have opposite thread directions. Both ends of the lead screw (54) are threadedly connected to sliding blocks (55). The sliding blocks (55) are slidably connected to the inside of the bottom rail (52). A clamping plate (56) is installed on the top of each sliding block (55). A pressure sensor (57) is fixedly connected to the top of a sliding block (55). A clamping plate (56) on the side near the pressure sensor (57) is connected to the detection end of the pressure sensor (57). Another clamping plate (56) is fixedly connected to the top of another sliding block (55). Anti-slip protrusions (58) are fixedly connected at equal intervals on the inner side of the clamping plate (56).

2. The transmission device for a pipe bending machine according to claim 1, characterized in that: Limiting holes (44) are provided on both upper sides of the mounting block (42), and the end of the mounting screw (43) is inserted into the limiting hole (44).

3. The transmission device for a pipe bending machine according to claim 2, characterized in that: The mounting screw (43) is a hand-tightening screw. The top view shape of the mounting block (42) and the internal bottom view shape of the mounting sleeve (41) are both set to square. The side shape of the slider (31) and the cross-sectional shape of the internal cavity of the guide rail (2) are both set to convex shape.

4. The transmission device for a pipe bending machine according to claim 3, characterized in that: Mounting holes (6) are provided at both the front and rear ends of the substrate (1), and the mounting holes (6) are countersunk holes.

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