Automatic clamping device for transferring and conveying coil material frame

Abstract

The present invention discloses an automatic clamping device for transplanting and conveying a coil material frame. The clamping device comprises a box body, a clamping claw module, a transmission module, a self-locking module, a wire rope module and a connecting seat. The clamping claw module and the transmission module are installed in the box body and are used to grab the coil material frame. The wire rope module comprises a plurality of wire ropes. The two ends of the wire rope are respectively connected to the box body and the connecting seat. The clamping claw module is used to extend into the central hole of the coil material frame and grab the coil material frame. The clamping claw module comprises a clamping claw and a clamping claw connecting rod. The transmission module comprises a gear, a clamping claw connecting rod and a rack rod. The self-locking module comprises a groove cam, a roller mounting rod, a roller and a tension spring. The present invention can realize the automatic grasping and releasing of the grasping state of the clamping claw to the material frame without using other power elements by continuing to move downward after the box body contacts the material frame, thereby realizing the automatic lifting of the material frame, and the automatic clamping device automatically detaches from the material frame after reaching the positioning location.

Description

Technical Field

[0001] The invention belongs to the technical field of material frame hoisting, and in particular relates to an automatic clamping device for transplanting and conveying a coil material frame. Background Art

[0002] Semi-finished metal pipes in the factory workshop are generally placed in a circular coil frame; the structure of the coil frame is as follows Figure 3 As shown, it is divided into two circles, the inner and outer circles are fixedly connected by the bottom metal surface. The outer layer limits the maximum diameter distance of the coil, and the inner layer serves as the central load-bearing and lifting point of the metal tube and cable. There is a lifting inner step at the contact position between the through hole in the center of the coil and the end face. Generally, the coil material frame is lifted by the inner support of the lifting device on the inner wall of the central through hole or the hook on the upper end face of the coil. When the material frame is small, human intervention is required to make the crane stay above the material frame. The operator manually uses the lifting device to support the inner wall of the central through hole of the material frame or uses the hook to lift the end face hook ring to control the crane to lift the coil material frame and place it on the next workstation. With the expansion of efficiency requirements, the diameter of the metal coil material frame is getting larger and larger, and the position of the central through hole of the material frame has far exceeded the range where the operator can place the lifting device. The previous manual use of the lifting device is time-consuming and labor-intensive, and the efficiency is low. With the advancement of crane automation and intelligence, the reliance on workers' operation and control needs is gradually reduced, and the transplantation and transmission of the coil material frame does not require worker intervention. Therefore, it is urgent to invent a large-scale material frame automatic clamping and automatic detachment device. Summary of the invention

[0003] The invention aims to solve the problems of difficulty in manually controlling the lifting of the lifting device and the difficulty in separating the lifting device from the material frame during the transplanting and transmission of the coil material frame, and low efficiency, and to provide a device for automatically clamping a large coil material frame and automatically separating the material frame after completing the lifting task.

[0004] The automatic gripping device for transferring and conveying a coil material frame comprises a box body, a clamping claw module, a transmission module, a self-locking module, a wire rope module and a connecting seat. The clamping claw module and the transmission module are installed in the box body and are used to grab the coil material frame. The wire rope module comprises a plurality of wire ropes. Both ends of the wire rope are connected to the box body and the connecting seat respectively. The clamping claw module is used to extend into the central hole of the coil material frame and grab the coil material frame. The cable provides tension to the box body through the connecting seat and the wire rope.

[0005] The clamp module includes a clamp and a clamp connecting rod. The inner ends of the two clamps are rotatably connected to the opposite sides of the bottom of the inner cavity of the box. The outer ends of the clamps extend from the bottom of the box, and the outer ends are provided with hooks. By flipping the two clamps in the opposite direction, the hooks on the two clamps are opened and connected to the hoisting parts on the coil material frame.

[0006] The transmission module includes a gear, a clamping rod and a rack rod. Both gears are installed inside the box; one end of the two clamping rods is rotatably connected to the eccentric positions of the two gears; the other ends of the two clamping rods are rotatably connected to the clamps. The top of the vertically arranged rack rod is slidably connected to the connecting seat; the bottom end of the rack rod extends between the two gears; both sides of the bottom end of the rack rod are provided with linearly arranged gear teeth. The linearly arranged gear teeth on both sides of the rack rod are meshed with the two gears respectively.

[0007] The self-locking module comprises a grooved cam, a roller mounting rod, a roller and a tension spring. The grooved cam is fixed in the box. One end of the roller mounting rod is rotatably connected to the rack rod, and the other end is rotatably connected to the roller. The roller extends into the working profile groove on the grooved cam.

[0008] The working contour groove includes an inner limiting surface and an outer limiting surface; the bottoms of the inner limiting surface and the outer limiting surface both present limiting areas with low sides and high middle; the highest point of the limiting area at the bottom of the inner limiting surface is staggered with the highest point of the limiting area at the bottom of the outer limiting surface in the horizontal direction. Whenever the rack rod moves downward to the limit position relative to the box body and resets upward once, the roller switches between the top center position and the bottom center position of the working contour groove once; during the up and down movement of the rack rod, the roller only rotates in one direction. A limiting portion is set at the top of the rack rod; a rectangular spring is placed on the rack rod, and its two ends respectively abut against the limiting portions on the box body and the rack rod.

[0009] Preferably, a mounting groove is provided in the middle position of the top of the inner limit surface. The middle position of the top of the outer limit surface is the highest point of the outer limit surface. A thumbwheel is installed at the center position of the mounting groove through a one-way bearing; the thumbwheel is provided with a plurality of paddles evenly distributed along its circumference. The highest point of the thumbwheel diameter in the vertical direction is lower than the highest point of the inner limit surface. The thumbwheel with a paddle that can only rotate in one direction only allows the roller to pass above the working contour groove in one direction. The rotation direction of the thumbwheel top is opposite to the staggered direction of the tip of the bottom of the outer limit surface relative to the tip of the limiting area at the bottom of the inner limit surface.

[0010] Preferably, the depth of the mounting groove is smaller than the width of the roller; therefore, the roller cannot enter the mounting groove.

[0011] Preferably, the coil material frame transplanting and conveying automatic clamping device further comprises a tension spring. The two ends of the tension spring are respectively fixed to the rack rod and the middle of the roller mounting rod. The tension spring is located on one side of the roller mounting rod; the moving direction of the top of the thumbwheel relative to the roller mounting rod is opposite to the elastic force direction of the tension spring on the roller mounting rod.

[0012] Preferably, the automatic clamping device for transferring and conveying the coil material frame further comprises a gear self-locking assembly; the gear self-locking assembly comprises a slider connecting rod, a clamp connecting rod, a clamp fixing shaft, a slider and a slider groove. The two ends of the slider connecting rod are rotatably connected to the eccentric position of the gear and the slider respectively; the slider is slidably connected to the slider groove. When the clamp opens to a preset position, the slider connecting rod abuts against the shoulder on the clamp fixing shaft.

[0013] Preferably, the rack rod slides vertically downward relative to the box body, driving the gear to rotate in the forward direction, and driving the two clamping jaws to open through the clamping jaw connecting rod. When the two clamping jaws are opened to a preset position, the tops of the linearly arranged gear teeth on both sides of the rack rod are separated from the corresponding gears.

[0014] Preferably, the limit shaft on the rack rod is in the connecting seat slot, and the upper limit position of the rack rod is limited by the end of the connecting seat slot.

[0015] Preferably, the tip of the hook portion at the outer end of the clamping jaw faces the side close to the inner end of the clamping jaw.

[0016] Preferably, a weighing module is provided between the connecting seat and the cable used for lifting.

[0017] Preferably, the top of the weighing module is connected to the crane cable via a bracket and a pulley.

[0018] Preferably, the working profile groove on the grooved cam is formed in a vertical plane.

[0019] Preferably, when the two clamping jaws are opened to a clamping working state, the axis of the clamping jaw connecting rod intersects with the axis of the gear.

[0020] The present invention has the following beneficial effects:

[0021] The present invention continues to move downward after the box body contacts the material frame, and can realize automatic grasping and releasing of the material frame by the clamping claws without using other power elements, thereby realizing automatic lifting of the material frame, and the automatic clamping device automatically detaches from the material frame after reaching the positioning location, and there is no need for manual operation of opening and closing of the clamping claws in this process.

[0022] The present invention is provided with a self-locking device to protect the internal mechanism of the device. During the lifting process, the material frame will not fall down due to factors of the device, thereby ensuring the safety and reliability of the device.

[0023] The clamping device of the present invention has a simple structure and is easy to manufacture and install. Most of the device is installed inside the box to prevent interference from external factors and facilitate disassembly and replacement of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 for Figure 1 A partial enlarged schematic diagram of part G in the middle.

[0026] Figure 3 It is a schematic cross-sectional view of the coil material frame being hoisted.

[0027] Figure 4 It is a schematic diagram of the combination of the gripper module and the transmission module in the present invention.

[0028] Figure 5 for Figure 4 A partial enlarged schematic diagram of part J in the middle.

[0029] Figure 6 It is a schematic diagram of the internal structure of the box in the present invention.

[0030] Figure 7 for Figure 6 A partial enlarged schematic diagram of the X portion in the middle.

[0031] Figure 8 It is a cross-sectional schematic diagram of the box body in the present invention.

[0032] Fig. 9 It is a schematic diagram of the clamping claw module of the present invention extending into the central hole of the coil material frame.

[0033] Fig.10 It is a schematic diagram of the clamping claw module in the present invention opening in the central hole of the coil material frame.

[0034] Fig.11 for Fig.10 A partial enlarged schematic diagram of the M part in the middle.

[0035] Fig.12 It is a front schematic diagram of the process of lifting the coil material frame of the present invention. DETAILED DESCRIPTION

[0036] The structure of the present invention is further explained below in conjunction with the accompanying drawings.

[0037] Example 1

[0038] like Figure 1-8As shown, an automatic clamping device for a coil material frame includes a box body 2, a clamping claw module, a transmission module, a self-locking module, a wire rope module and a weighing module 3. The top 311 of the weighing module 3 is connected to the crane cable through a bracket 4 and a pulley 5. The bottom of the weighing module 3 is slidably connected to the box body in the vertical direction. The clamping claw module and the transmission module are installed in the box body for grabbing the coil material frame 6. A connecting seat 312 is fixed to the bottom of the weighing module 3. The wire rope module includes four steel wire ropes 11. The two ends of the steel wire rope 11 are respectively fixed to the box body wire rope rod 711 and the connecting seat wire rope rod 911. The box body wire rope rod 711 and the connecting seat wire rope rod 911 are respectively fixed to the box body 2 and the connecting seat 312. The steel wire rope 11 can transmit the pulling force to the box 2 to pull the pipe material frame 6, but does not limit the upward movement of the box 2 relative to the weighing module 3; the weighing module 3 includes a weighing sensor 3, which can detect whether it is loaded or unloaded when lifting the material frame. The bottom of the clamping claw module can extend into the top of the center hole of the pipe material frame 6, and open the two clamping claws to buckle the downward limit lifting part 611 on the top of the pipe material frame 6.

[0039] The clamp module includes a clamp 1, a clamp connecting rod 16 and a clamp fixing shaft 712. The inner ends of the two clamps 1 are rotatably connected to the opposite sides of the bottom of the inner cavity of the box body 2. The outer end of the clamp 1 extends from the clearance gap 213 in the middle position of the bottom of the box body 2, and a hook portion is provided at the end of the outer end; the tip of the hook portion faces the side close to the inner end of the clamp. By flipping the two clamps in the opposite direction, the hook portions on the two clamps can be opened to clamp the hanging portion 611 on the coil material frame 6. The hanging portion 611 on the coil material frame is in the shape of a stepped hole with a larger inside and a smaller outside.

[0040] The transmission module includes a gear 15, a clamping rod 16 and a rack rod 12. The two gears 15 are symmetrically installed inside the housing 2; one end of the two clamping rods 16 is rotationally connected to the eccentric positions of the two gears 15, and the other end is rotationally connected to the middle position of the clamping rod 1. The top end of the vertically arranged rack rod 12 extends from the clearance notch 214 on the housing and is slidably connected to the slide groove on the connecting seat 312 of the weighing module 3, and the end of the slide groove cooperates with the limit shaft 10 fixed on the top of the rack rod 12 to provide an upper limit for the rack rod 12. The bottom end of the rack rod 12 extends between the two gears; linearly arranged gear teeth 1214 are provided on both sides of the bottom end of the rack rod.

[0041] The gear 15 is connected to the clamping jaw 1 through the clamping jaw connecting rod 16 for transmission, and the linear arrangement gear teeth 1214 on both sides of the rack rod 12 are respectively meshed with the two gears 15; when the rack rod 12 slides vertically downward relative to the box body 2, it will drive the gear 15 to rotate in the positive direction, and drive the two clamping jaws 1 to open through the clamping jaw connecting rod 16. When the rack rod 12 slides downward to the area where the linear arrangement gear teeth 1214 are separated from the gear 15, the sliding of the rack rod 12 no longer drives the gear 15 to rotate, that is, after the two clamping jaws 1 are opened to the limit position, the sliding of the rack rod 12 no longer drives the two clamping jaws 1 to continue to open outward.

[0042] The self-locking module includes a rack self-locking assembly and a gear connecting rod self-locking assembly. The rack self-locking assembly includes a slotted cam 211, a roller mounting rod 18, a roller 17 and a tension spring 19. The slotted cam 211 is fixed in the box. The working profile groove on the slotted cam 211 is formed in a vertical plane. One end of the roller mounting rod 18 is rotatably connected to the protruding connecting shaft 1213 on the rack rod 12, and the other end is rotatably connected to the roller 17. The roller 17 extends into the working profile groove on the slotted cam 211.

[0043] The working contour groove includes an inner limit surface and an outer limit surface; the distance between the inner limit surface and the outer limit surface at the smallest point is slightly larger than the diameter of the roller 17; the bottoms of the inner limit surface and the outer limit surface both present limit areas with low sides and high middle; the tip of the limit area at the bottom of the inner limit surface is staggered in the horizontal direction with the tip of the limit area at the bottom of the outer limit surface.

[0044] A mounting groove is provided in the middle position of the top of the inner limit surface. The middle position of the top of the outer limit surface is the highest point of the outer limit surface. A thumbwheel is installed at the center of the mounting groove through a one-way bearing; the thumbwheel is provided with a plurality of paddles 212 evenly distributed along its circumference. The thumbwheel with paddles 212 and capable of only one-way rotation only allows the roller 17 to pass over the top of the working contour groove in one direction, thereby preventing the roller 17 from moving in the opposite direction. The rotation direction of the top of the thumbwheel is opposite to the staggered direction of the tip of the bottom of the outer limit surface relative to the tip of the limiting area at the bottom of the inner limit surface. The depth of the mounting groove is less than the width of the roller 17; therefore, the roller 17 cannot enter the mounting groove.

[0045] Every time the rack bar moves downward to the limit position relative to the box body, the roller 17 switches between the top center position and the bottom center position of the working profile groove; since there is a height difference between the top center and the bottom center of the working profile groove, the rack bar can be switched between two working positions with a height difference by moving the rack bar downward to the limit position. The two working positions of the rack bar correspond to the open state and the closed state of the two clamping jaws respectively.

[0046] The two ends of the tension spring 19 are respectively fixed to the middle of the rack rod and the roller mounting rod 18. The tension spring 19 is located on one side of the roller mounting rod 18; the moving direction of the top of the thumbwheel relative to the roller mounting rod 18 is opposite to the installation direction of the tension spring 19 relative to the roller mounting rod 18.

[0047] A limiting part is provided at the top of the rack rod; a rectangular spring 8 is sleeved on the rack rod, and its two ends respectively abut against the limiting parts on the box body and the rack rod. The rectangular spring 8 is in a compressed state, and the tension spring 19 is in a pulled state. The elastic force of the rectangular spring 8 on the box body is much greater than the tension of the tension spring 19 on the roller mounting rod 18. When the clamp 1 is in a closed state, due to the action of the rectangular spring 8, the roller 17 is limited to the middle position of the top of the working profile (i.e., in contact with the highest point of the outer limit surface). At this time, it just contacts the two paddles of the rotating paddle 212. When the clamp 1 is in an open state to lift the coil material frame 6, the roller 17 is in contact with the concave part of the working profile groove under the action of the rack rod 12, so that the rack rod has two upper and lower stable limit positions relative to the box body in the vertical direction (the two stable limit positions correspond to the open state and the closed state of the two clamps, respectively).

[0048] The gear self-locking assembly includes a slider connecting rod 14, a clamping claw connecting rod 16, a clamping claw fixing shaft 712, a slider 13 and a slider groove 215. The slider connecting rod 14 connects the gear 15 and the slider 13, and the slider 13 can slide in the slider groove 215. When the two clamping claws 1 clamp the hoisting part 611 at the upper end surface of the coil material frame 6 and move upward, at this time, a part of the pulling force of the clamping claw 1 is applied to the connecting rod 16 to be transmitted to the gear 15, forcing the gear 15 to rotate in the direction of the pulling force. At this time, the slider connecting rod 14 contacts the shoulder 7121 on the clamping claw fixing shaft 712 to limit the rotation of the gear, complete the gear force release, and rely on the slider connecting rod 14 to complete the self-locking of the gear 15.

[0049] As an optional example, the roller mounting rod 18 and the rack rod 12 are rotationally connected via a protruding connecting shaft 1213 fixed on the rack rod 12; the two ends of the tension spring 19 are respectively connected to the middle hook block of the roller mounting rod 18 and the hook block 1212 on the small rod protruding to one side in the middle of the rack rod 12.

[0050] As an optional example, the inner end of the clamp 1 is installed inside the box 2 through the clamp fixing shaft 712. It cannot be displaced axially under the action of the clamp fixing shaft 712. The middle part is connected to the clamp connecting rod 16 through a short shaft. The two connections form a rotating pair. In the initial state, the maximum distance between the lower ends of the two clamps is much smaller than the center opening diameter of the material frame.

[0051] As an optional example, bearings are installed on the center holes of the two gears 15. The bearings are symmetrically installed on both sides of the box through a fixed axis and cannot be axially displaced. The end faces of the gears are connected with a clamping claw connecting rod 16 and a slider connecting rod 14. The two gears 15 can simultaneously engage with the linearly arranged gear teeth 1214 on both sides of the rack rod 12.

[0052] As an optional example, the extension spring 19 is a tension spring, and the rectangular spring 8 is a compression spring.

[0053] The material frame clamping process of the coil material frame transplanting and conveying automatic clamping device is as follows:

[0054] In the initial state, the crane is positioned just above the coil material frame, and the cable is lowered. The coil material frame clamping device of the present invention moves downward, and the clamping claw 1 extends into the central hole of the coil material frame 6. The lower end surface of the box body 2 contacts the upper end surface of the coil material frame 6. The cable continues to be lowered, and the sliding groove surface of the connecting seat 312 of the weighing module contacts the limit shaft 10 on the rack rod 12, driving the rack rod 12 to move downward, the rectangular spring 8 is compressed, and the roller 17 is driven by the roller mounting rod 18 and the dial paddle 212 to roll along the grooved cam 211. The linearly arranged gear teeth 1214 at the end of the rack rod 12 mesh with the gear 115, causing the gear to rotate forward, and the clamping claw moves. The connecting rod 16 causes the clamping jaw 1 to expand to both sides under the rotation of the gear, and the slider connecting rod 14 drives the slider 13 to slide to both sides along the slider groove 215 under the rotation of the gear. As the cable continues to be lowered, the linearly arranged gear teeth 1214 on the rack rod 12 are no longer engaged with the gear 15, and the clamping jaw 1 is expanded to the limit position. The roller 17 is in a stable limit position below the inner limit surface under the action of the rectangular spring 8 and the tension spring 19, completing the self-locking of the rack self-locking assembly; the slider connecting rod 14 is driven by the gear 15 to contact the shoulder 7121 on the clamping jaw fixed shaft 712, limiting the rotation of the gear 15, and completing the self-locking of the gear rod self-locking assembly.

[0055] The crane cable rises, the wire rope 11 pulls the box 2, the clamping jaw 1 in the box rises as a whole, the hook part of the clamping jaw 1 contacts the lifting part 611 of the coil material frame, and the coil material frame rises. After rising to the specified height, the crane reaches the target lowering position, the cable descends, and the lower end surface of the coil material frame contacts the specified plane. As the cable continues to be lowered, the sliding groove limit surface on the connecting seat 312 contacts the limit shaft 10 on the rack rod 12 again, and the rack rod moves downward a short distance again. The rectangular spring 8 continues to be compressed, and the roller 17 leaves the stable limit position below the inner limit surface and contacts the outer limit surface downward. At this time, the gear does not move. The cable moves upward, and under the action of the rectangular spring, the linearly arranged gear teeth 1214 at the end of the rack rod 12 mesh with the gear 15 again to drive the gear to rotate in the opposite direction. Under the action of the gear, the clamping claw connecting rod 16 drives the clamping claw 1 to close, and the roller 17 rolls upward along the inner and outer limit surfaces under the action of the tension spring 19 and the rectangular spring 8, completing the unlocking of the rack self-locking assembly; the slider connecting rod 14 drives the slider 13 to slide toward the center along the slider groove 215 under the reverse rotation of the gear, and no longer contacts the shoulder 7121 on the clamping claw fixed shaft 712, completing the unlocking of the gear self-locking assembly. As the cable continues to move upward, the clamping claw 1 is completely closed to the initial state, and the roller 17 moves along the groove to the uppermost stable limit position of the outer limit surface under the action of the rectangular spring, the tension spring, and the dial wheel, and the coil material frame clamping device is separated from the material frame, completing the lifting and lowering tasks of the coil material frame. The crane repeats this step to complete the lifting and lowering tasks of the coil material frame transplantation and transmission.

[0056] Example 2

[0057] The difference between this embodiment and embodiment 1 is that: in this embodiment, no gear-connecting rod self-locking assembly is provided; after the clamping jaw 1 opens to the maximum displacement, the gear self-locking is completed as long as the two connection positions of the center of the gear 15 and the clamping jaw connecting rod 16 are in a straight line to complete the force release effect.

[0058] Example 3

[0059] The difference between this embodiment and embodiment 1 is that: in this embodiment, no thumbwheel is provided, and no tension spring is provided; the highest point of the top of the inner limit surface of the working profile groove of the slot-shaped cam is staggered with the highest point of the top of the outer limit surface; the highest point of the top of the outer limit surface and the highest point of the limit area at the bottom of the inner limit surface are the upper limit position and the lower limit position respectively; the upper limit position and the lower limit position correspond to the upper working position and the lower working position of the rack rod respectively. The inner limit surface part directly below the upper limit position and the outer limit surface part directly below the lower limit position are both tilted upward, and the tilting directions are opposite, so that when the gear rod moves up and down, the roller will only rotate in one direction.

Claims

1. An automatic clamping device for transferring and conveying a coiled material frame, characterized in that: The invention comprises a housing (2), a clamping claw module, a transmission module, a self-locking module, a wire rope module and a connecting seat (312); the clamping claw module and the transmission module are installed in the housing and are used to grab the coil material frame (6); the wire rope module comprises a plurality of wire ropes (11); the two ends of the wire ropes (11) are respectively connected to the housing (2) and the connecting seat (312); the clamping claw module is used to extend into the central hole of the coil material frame (6) and grab the coil material frame (6); the cable provides a pulling force to the housing (2) through the connecting seat (312) and the wire rope (11); The clamping claw module comprises a clamping claw (1) and a clamping claw connecting rod (16); the inner ends of the two clamping claws (1) are rotatably connected to the opposite sides of the bottom of the inner cavity of the box body (2); the outer ends of the clamping claws (1) extend from the bottom of the box body (2), and the outer ends are provided with hook portions; by flipping the two clamping claws in the opposite direction, the hook portions on the two clamping claws are opened and connected to the hanging portion (611) on the coil material frame (6); The transmission module comprises a gear (15), a clamping claw connecting rod (16) and a rack rod (12); the two gears (15) are both installed inside the box (2); one end of the two clamping claw connecting rods (16) are respectively rotatably connected to the eccentric positions of the two gears (15); the other ends of the two clamping claw connecting rods (16) are respectively rotatably connected to the clamping claws (1); the top end of the vertically arranged rack rod (12) is slidably connected to the connecting seat (312); the bottom end of the rack rod (12) extends between the two gears; linearly arranged gear teeth (1214) are arranged on both sides of the bottom end of the rack rod; the linearly arranged gear teeth (1214) on both sides of the rack rod (12) are respectively meshed with the two gears (15); The self-locking module comprises a slotted cam (211), a roller mounting rod (18), a roller (17) and a tension spring (19); the slotted cam (211) is fixed in a box; one end of the roller mounting rod (18) is rotatably connected to the rack rod (12), and the other end is rotatably connected to the roller (17); the roller (17) extends into a working profile groove on the slotted cam (211); The working contour groove comprises an inner limiting surface and an outer limiting surface; the bottoms of the inner limiting surface and the outer limiting surface both present limiting areas with low sides and high middle; the highest point of the limiting area at the bottom of the inner limiting surface and the highest point of the limiting area at the bottom of the outer limiting surface are staggered in the horizontal direction; each time the rack rod moves downward to the limit position relative to the box body and resets upward once, the roller (17) switches once between the top center position and the bottom center position of the working contour groove; during the process of the rack rod moving up and down, the roller (17) only rotates in one direction; a limiting portion is provided at the top of the rack rod; a rectangular spring (8) is sleeved on the rack rod, and its two ends respectively abut against the limiting portions on the box body and the rack rod.

2. The automatic clamping device for transferring and conveying a coiled pipe material frame according to claim 1 is characterized in that: A mounting groove is provided at the middle position of the top of the inner limit surface; the middle position of the top of the outer limit surface is the highest point of the outer limit surface; a thumbwheel is installed at the center of the mounting groove via a one-way bearing; the thumbwheel is provided with a plurality of paddles (212) evenly distributed along its circumference; the thumbwheel has a vertical diameter whose highest point is lower than the highest point of the inner limit surface; the thumbwheel with the paddles (212) and which can only rotate in one direction only allows the roller (17) to pass above the working contour groove in one direction; and the rotation direction of the thumbwheel top is opposite to the staggered direction of the tip of the bottom of the outer limit surface relative to the tip of the limit area at the bottom of the inner limit surface.

3. The automatic clamping device for transferring and conveying a coiled pipe material frame according to claim 2 is characterized in that: The depth of the mounting groove is smaller than the width of the roller (17).

4. The automatic clamping device for transferring and conveying a coiled pipe material frame according to claim 2 or 3, characterized in that: It also includes a tension spring (19); the two ends of the tension spring (19) are respectively fixed to the rack rod and the middle of the roller mounting rod (18); the tension spring (19) is located on one side of the roller mounting rod (18); the moving direction of the top of the thumbwheel relative to the roller mounting rod (18) is opposite to the direction of the elastic force of the tension spring (19) on the roller mounting rod (18).

5. The automatic clamping device for transferring and conveying a coiled pipe material frame according to claim 1 is characterized in that: It also includes a gear self-locking component; the gear self-locking component includes a slider connecting rod (14), a clamping claw connecting rod (16), a clamping claw fixing shaft (712), a slider (13) and a slider groove (215); the two ends of the slider connecting rod (14) are rotatably connected to the eccentric position of the gear (15) and the slider (13) respectively; the slider (13) is slidably connected to the slider groove (215); when the clamping claw is opened to a preset position, the slider connecting rod (14) abuts against the shoulder on the clamping claw fixing shaft.

6. The automatic clamping device for transferring and conveying a coiled pipe material frame according to claim 1, characterized in that: The rack rod (12) slides vertically downward relative to the box body (2), driving the gear (15) to rotate in the forward direction, and driving the two clamping jaws (1) to open via the clamping jaw connecting rod (16); when the two clamping jaws (1) are opened to a preset position, the tops of the linearly arranged gear teeth (1214) on both sides of the rack rod (12) are separated from the corresponding gear (15).

7. The automatic clamping device for transferring and conveying a coiled pipe material frame according to claim 1, characterized in that: The limit shaft (10) on the rack rod is in the sliding groove of the connecting seat (312), and the upper limit position of the rack rod (12) is limited by the end of the sliding groove of the connecting seat (312).

8. The automatic clamping device for transferring and conveying a coiled pipe material frame according to claim 1, characterized in that: When the two clamping jaws (1) are opened to a clamping working state, the axis of the clamping jaw connecting rod intersects with the axis of the gear.

9. The automatic clamping device for transferring and conveying a coiled pipe material frame according to claim 1, characterized in that: A weighing module (3) is arranged between the connection seat (312) and the cable used for hoisting.

10. The automatic clamping device for transferring and conveying a coiled pipe material frame according to claim 1, characterized in that: The highest point of the top of the outer limit surface and the highest point of the limit area at the bottom of the inner limit surface are the upper limit point and the lower limit point respectively; the upper limit point and the lower limit point correspond to the upper working position and the lower working position of the rack rod respectively; the inner limit surface part directly below the upper limit point and the outer limit surface part directly below the lower limit point are both inclined upward, and the inclination directions are opposite.

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