Automatic heading, drawing and forming all-in-one machine for pipe fittings

Abstract

The invention discloses a pipe fitting automatic heading, drawing and forming all-in-one machine which comprises a feeding device, a heading transfer device, a transferring device and a drawing device, a pipe fitting to be machined is conveyed to a first station through a feeding mechanism of the feeding device and then is moved into a heading mechanism through a first transfer mechanism of the heading transfer device, and then the pipe fitting to be machined is conveyed to a second station through a second transfer mechanism of the drawing device. The end part of the steel wire rope is shrunk through the heading mechanism and then moved to the second transfer mechanism; and the pipe fitting with the shrunk end is conveyed to the pipe fitting transfer mechanism located at the second station of the transfer device through the second transfer mechanism, the pipe fitting transfer mechanism is driven by the transfer driving mechanism to move from the second station to the third station and then is conveyed to the drawing device, and the drawing operation of the pipe fitting is completed. Full-automatic continuous operation of automatic feeding, heading, transferring and drawing of the pipe fittings is achieved, the production efficiency is improved, and the labor cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal pipe processing equipment, and particularly relates to an integrated machine for automatically heading, drawing, and forming pipe fittings. Background Art

[0002] The hot rolling method for seamless steel pipes is the main method for producing seamless steel pipes today. However, the dimensional accuracy of the steel pipes produced by the hot rolling method is insufficient, and other defects such as concave surfaces, straight-throughs, and indentations may even occur. In order to obtain seamless steel pipes with a smooth surface, high dimensional accuracy, and few defects, the drawing production method is often used. Currently, for drawing steel pipes, it is necessary to manually transport the steel pipes to the heading machine for heading, and then transport the headed steel pipes to the drawing assembly. Each process requires manual handling, resulting in low production efficiency, poor stability, and a large amount of labor. Summary of the Invention

[0003] In order to overcome the above defects, the present invention provides an integrated machine for automatically heading, drawing, and forming pipe fittings with a high degree of automation and high drawing efficiency.

[0004] The technical solution adopted by the present invention to solve its technical problems is: to provide an integrated machine for automatically heading, drawing, and forming pipe fittings. Define two mutually perpendicular directions in the plane as the X direction and the Y direction respectively, and the vertical direction as the Z direction. The integrated machine includes:

[0005] A feeding device having a first station and a feeding mechanism for continuously providing pipe fittings to the first station;

[0006] A heading transfer device is provided on the positive X side of the first station, including a first transfer mechanism and a second transfer mechanism for transferring pipe fittings, and a heading mechanism for reducing the end of the pipe fittings. The first transfer mechanism is used to move the pipe fittings located on the first station into the heading mechanism, and after reducing the end of the pipe fittings through the heading mechanism, move them onto the second transfer mechanism. The second transfer mechanism is used to move the pipe fittings with the reduced end placed therein along the Y direction;

[0007] A transfer device is provided on the positive Y side of the heading transfer device, having a second station and a third station formed on the positive X side of the second station. The transfer device includes at least one set of pipe fitting transfer mechanisms docked with the second transfer mechanism, and a transfer driving mechanism for driving the pipe fitting transfer mechanisms to reciprocate between the second station and the third station;

[0008] A drawing device is provided on the negative Y side of the third station, including a core-pulling mechanism docked with the pipe fitting transfer mechanism, and a drawing traction mechanism for clamping and drawing the pipe fittings in cooperation with the core-pulling mechanism;

[0009] Among them, the pipe fittings to be processed are conveyed to the first station through the feeding mechanism of the feeding device, then moved into the heading mechanism through the first transfer mechanism of the heading transfer device, and the end of the pipe fittings is reduced by the heading mechanism and then moved onto the second transfer mechanism;

[0010] The pipe fittings with reduced ends are conveyed to the pipe fitting transfer mechanism at the second station of the transfer device through the second transfer mechanism, and the pipe fitting transfer mechanism is driven by the transfer driving mechanism to move from the second station to the third station and then conveyed to the drawing device to complete the drawing operation of the pipe fittings.

[0011] As a further improvement of the present invention, the feeding mechanism includes a conveying assembly for conveying the pipe fittings to the first station, and a clamping and flipping assembly for successively clamping the pipe fittings located at the first station and flipping them by a certain degree;

[0012] The conveying assembly includes a conveying line body arranged along the X direction and a pipe fitting conveyor belt wound around the conveying line body, and a plurality of material grooves arranged at intervals along the Y direction are provided on the pipe fitting conveyor belt;

[0013] The clamping and flipping assembly includes flipping jaws, a driven rod, a flipping gear, a rack and a rack driving mechanism. The driven rod is arranged along the Y direction, and two groups of flipping jaws are respectively arranged at both ends of the driven rod. The flipping gear is sleeved in the middle of the driven rod. The rack is arranged along the Z direction and is in transmission cooperation with the flipping gear. The rack driving mechanism is used to drive the rack to reciprocate along the Z direction.

[0014] As a further improvement of the present invention, the first transfer mechanism includes a transfer clamping assembly for clamping the pipe fittings flipped by the clamping and flipping assembly, and a moving module for driving the transfer clamping assembly to reciprocate respectively in the X, Y, and Z directions;

[0015] The transfer clamping assembly includes a jaw connection bracket arranged along the Y direction, and transfer jaws arranged on the lower sides of both ends of the jaw connection bracket;

[0016] The moving module includes an X-direction slide rail arranged along the X direction and a Y-direction slide rail arranged along the Y direction. The X-direction slide rail is driven by a first driving motor to reciprocate on the Y-direction slide rail.

[0017] As a further improvement of the present invention, a Z-direction driving cylinder for driving the jaw connection bracket to reciprocate up and down is arranged in the middle of the upper side of the jaw connection bracket. The Z-direction driving cylinder is slidably connected to the X-direction slide rail through a slider and is driven by a second driving motor to reciprocate on the X-direction slide rail.

[0018] As a further improvement of the present invention, the heading mechanism includes a guiding component and a heading component sequentially arranged along the Y negative side of the first station. The guiding component has a guiding slot hole allowing the end of the pipe fitting to pass through. The heading component includes a supporting frame body. On the supporting frame body, there are clamping tools for clamping the pipe fitting in its thickness direction, and heading tools for reducing the end of the pipe fitting in its width direction.

[0019] As a further improvement of the present invention, the clamping tools include two groups of clamping arms arranged along the X direction and slidably connected to the two side walls of the supporting frame body respectively. On the relatively far ends of the two clamping arms, there are clamping cylinders respectively. The clamping cylinders are used to drive the clamping arms to move relatively closer to clamp the pipe fitting or move relatively farther to release the pipe fitting;

[0020] The heading tools include two groups of heading parts arranged along the Z direction and slidably connected to the upper and lower walls of the supporting frame body respectively. On the relatively far ends of the two heading parts, there are heading cylinders respectively. The heading cylinders are used to drive the heading parts to move relatively closer to reduce the end of the pipe fitting.

[0021] As a further improvement of the present invention, the second transfer mechanism includes a transfer guiding groove arranged along the Y direction, and a transfer pushing component for pushing the pipe fitting placed in the transfer guiding groove to the second station. The transfer pushing component includes a transfer pushing rod and a sprocket driving group for driving the transfer pushing rod to reciprocate along the Y direction;

[0022] The transfer guiding groove has two relatively arranged guiding plates, and a number of conveying roller wheels are arranged at intervals on the guiding plates.

[0023] As a further improvement of the present invention, the sprocket driving group includes two synchronous belt wheels arranged at intervals along the Y direction, a synchronous belt sleeved on the two synchronous belt wheels, and a third driving motor for driving the synchronous belt wheels to rotate forward or reverse to drive the transfer pushing rod to reciprocate between the Y negative end and the Y positive end of the transfer guiding groove.

[0024] As a further improvement of the present invention, the pipe fitting transfer mechanism includes a transfer material groove component arranged along the Y direction and a transfer pushing component arranged at the Y positive end of the transfer material groove component;

[0025] The transfer material groove component includes a transfer material groove arranged along the Y direction. The transfer pushing component includes a transfer pushing rod and a fourth driving motor for driving the transfer pushing rod to reciprocate along the Y direction,

[0026] When the transfer material groove component is located at the third station, the fourth driving motor is used to drive the transfer pushing rod on the transfer material groove component to push the pipe fitting located in the transfer material groove into the drawing device;

[0027] On opposite sides of the transfer chute, a number of guide rollers are provided and arranged in a predetermined manner.

[0028] As a further improvement of the present invention, two sets of pipe fitting transfer mechanisms are provided. One set of the pipe fitting transfer mechanisms linearly reciprocates between the second station and the third station along the X direction driven by a fifth driving motor, and the other set of the pipe fitting transfer mechanisms reciprocates between the second station and the third station along the Z direction and the X direction through the transfer driving mechanism.

[0029] As a further improvement of the present invention, the transfer driving mechanism includes two transfer fixing frames arranged at intervals along the Y direction and used for fixing the pipe fitting transfer mechanism. Lifting driving components are respectively provided on the two transfer fixing frames, and the lifting driving components are used to drive the two transfer fixing frames to rise or fall synchronously.

[0030] The two lifting driving components are fixedly connected to a translation support through a translation bracket, and the translation driving component is used to drive the translation bracket to drive the pipe fitting transfer mechanism to reciprocate between the second station and the third station along the X direction.

[0031] As a further improvement of the present invention, the drawing die base mechanism includes a Y-negative side die core base provided at the third station and a drawing die core provided on the die core base. The drawing die core is in an overfit with the pipe fitting;

[0032] The drawing traction mechanism is arranged on the Y-negative side of the drawing die base mechanism through a drawing base, and includes a drawing sprocket group arranged along the Y direction, a drawing tractor meshed and driven with the drawing sprocket group, and a servo motor used to drive the drawing tractor to reciprocate on the drawing base;

[0033] A drawing jaw facing the drawing die base mechanism side is provided on the drawing tractor, and an action driving motor for driving the drawing jaw to open or clamp is provided.

[0034] As a further improvement of the present invention, a plurality of dial rod assemblies are arranged at intervals along the Y direction on one side side wall of the drawing base, and the dial rod assemblies are used to limit the levelness of the pipe fitting during the drawing operation;

[0035] Each dial rod assembly includes a rotating shaft arranged in the vertical direction, a dial rod provided at the upper end of the rotating shaft, and a sixth driving motor used to drive the rotating shaft to rotate. The rotating shaft is rotatably connected to one side side wall of the drawing base through a second positioning bearing.

[0036] The beneficial effects of the present invention are as follows: The feeding device continuously supplies pipe fittings to the subsequent device. The first transfer mechanism of the heading transfer device clamps and moves the pipe fittings, and the heading mechanism automatically performs a heading operation on the end of the pipe fittings. The pipe fittings with reduced ends are transferred to the transfer device through the second transfer mechanism, and then transferred to the drawing device through the transfer device. Finally, the drawing operation on the pipe fittings is carried out through the mutual cooperation of the core-pulling mechanism and the drawing traction mechanism of the drawing device, realizing the fully automated continuous operation of automatic feeding, heading, transfer, and drawing of the pipe fittings, improving production efficiency and saving labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic structural diagram of the present invention;

[0038] Figure 2 is a schematic structural diagram of the feeding device of the present invention;

[0039] Figure 3 is a schematic structural diagram of the clamping and flipping assembly of the present invention;

[0040] Figure 4 is a schematic structural diagram of the heading transfer device of the present invention;

[0041] Figure 5 is a schematic diagram of the first transfer mechanism of the present invention;

[0042] Figure 6 is a schematic diagram of the heading mechanism of the present invention;

[0043] Figure 7 is a schematic structural diagram of the heading mechanism from another perspective of the present invention;

[0044] Figure 8 is a schematic structural diagram of the transfer device of the present invention;

[0045] Figure 9 is a schematic structural diagram of the transfer drive mechanism of the present invention;

[0046] Figure 10 is a schematic structural diagram of the pipe fitting handover mechanism of the present invention;

[0047] Figure 11 is a schematic structural diagram of the core-pulling mechanism of the present invention;

[0048] Figure 12 is a schematic structural diagram of the drawing traction mechanism of the present invention;

[0049] Figure 13 For the present invention Figure 12 the enlarged structural diagram of D;

[0050] Figure 14 is a schematic structural diagram of the lever assembly of the present invention.

[0051] The following description is made in conjunction with the accompanying drawings:

[0052] A. First working station; B. Second working station; C. Third working station; 1000. Pipe fitting; 1. Feeding device; 11. Loading mechanism; 111. Conveying component; 1111. Conveyor line body; 1112. Pipe fitting conveyor belt; 1113. Feed trough; 112. Clamping and flipping component; 1121. Flipping jaw; 1122. Driven rod; 11221. First positioning bearing; 1123. Flipping gear; 1124. Rack; 11241. Slide block; 1125. Rack driving mechanism; 1126. Mounting plate; 11261. Linear guide rail; 1127. Transmission plate; 2. Heading transfer device; 21. First transfer mechanism; 211. Transfer clamping component; 2111. Jaw connecting bracket; 2112. Transfer jaw; 212. Moving module; 2121. X-direction slide rail; 2122. Y-direction slide rail; 2123. First driving motor; 2124. Z-direction driving cylinder; 2125. Slide block; 2126. Second driving motor; 22. Heading mechanism; 221. Guiding component; 2211. Guiding groove hole; 222. Heading component; 2221. Support frame body; 2222. Clamping arm; 2223. Clamping cylinder; 2224. Heading piece; 2225. Heading cylinder; 23. Second transfer mechanism; 231. Transfer guiding trough; 2311. Guiding plate; 2312. Conveying roller; 2313. Adjusting structure; 2314. Guide rail structure; 232. Transfer pushing component; 2321. Transfer pushing rod; 2322. Synchronous pulley; 2323. Synchronous belt; 2324. Third driving motor; 2325. Guide rail; 2326. Guide bracket; 2327. Right-angle fixing frame; 3. Transfer device; 31. Pipe fitting transfer mechanism; 311. Transfer feed trough component; 3111. Transfer feed trough; 3112. Guiding roller; 312. Transfer pushing component; 3121. Transfer pushing rod; 3122. Fourth driving motor; 32. Transfer driving mechanism; 321. Transfer fixing frame; 322. Lifting driving component; 323. Translation bracket; 324. Translation driving component; 33. Fifth driving motor; 4. Drawing device; 41. Core-pulling mechanism; 411. Die core base; 412. Drawing die core; 42. Drawing traction mechanism; 421. Drawing sprocket set; 422. Drawing tractor; 4221. Drawing jaw; 4222. Action driving motor; 423. Servo motor; 43. Drawing base; 44. Lever component; 441. Rotating shaft; 442. Lever; 443. Sixth driving motor; 444. Second positioning bearing; 5. Machine table supply device; 6. Control system device. Detailed implementation mode

[0053] The following makes a detailed description of a preferred embodiment of the present invention in conjunction with the accompanying drawings.

[0054] Refer to Figures 1 to 14, an automatic pipe fitting heading and drawing forming integrated machine provided by the present invention realizes the fully automatic continuous operation of automatic feeding, heading, transfer, and drawing of pipe fittings, thereby improving production efficiency and saving labor costs.

[0055] For the convenience of description, the present invention defines two mutually perpendicular directions in a plane as the X direction and the Y direction respectively, and the vertical direction as the Z direction. The automatic pipe fitting heading and drawing forming integrated machine provided by the present invention is referred to Figure 1 , which includes a feeding device 1, a heading transfer device 2, a transfer device 3, a drawing device 4, a machine platform supply device 5 for supplying oil or gas to the machine platform, and a control system device 6 for controlling the coordinated operation between the devices. The above devices are not limited to the attached Figure 1 layout mode.

[0056] Among them, the feeding device 1 has a first station A and a feeding mechanism 11 for continuously providing pipe fittings to be processed for the first station A. The feeding mechanism 11 can adopt a manipulator, a conveyor line, etc. to achieve continuous feeding;

[0057] The heading transfer device 2 is arranged on the positive X side of the first station A and includes a first transfer mechanism 21, a heading mechanism 22, and a second transfer mechanism 23. The first transfer mechanism 21 is used to move the pipe fitting located on the first station A from the first station A to place one end of the pipe fitting into the heading mechanism 22, and after completing the heading operation, transfer the pipe fitting to the second transfer mechanism 23. The second transfer mechanism 23 is used to move the pipe fitting placed therein along the Y direction, so that the pipe fitting that has been headed by the heading mechanism 22 can smoothly enter the drawing die core 412 of the die core base 411 during the subsequent drawing operation;

[0058] The transfer device 3 is arranged on the positive Y side of the heading transfer device 2 and has a second station B and a third station C formed on the positive X side of the second station B. The transfer device 3 includes at least one set of pipe fitting transfer mechanisms 31 that are docked with the second transfer mechanism 23 and can move the pipe fitting along the Y direction, and a transfer drive mechanism 32 for driving the pipe fitting transfer mechanism 31 to reciprocate between the second station B and the third station C. The setting of the transfer device 3 is conducive to the continuous transfer of the pipe fitting between the heading transfer device 2 and the drawing device 4, meeting the non-stop operation of the drawing device 4;

[0059] The drawing device 4 is arranged on the negative Y side of the third station C and includes a core-pulling mechanism 41 docked with the pipe fitting transfer mechanism 31 and a drawing traction mechanism 42 that cooperates with the core-pulling mechanism 41 to clamp and draw the pipe fitting.

[0060] Among them, the pipe fittings to be processed are conveyed to the first station A through the feeding mechanism 11 of the feeding device 1, then moved into the heading mechanism 22 through the first transfer mechanism 21 of the heading transfer device 2, and the end of the pipe fitting is reduced by the heading mechanism 22 and then moved onto the second transfer mechanism 23;

[0061] The pipe fittings with reduced ends are conveyed to the pipe fitting transfer mechanism 31 at the second station B of the transfer device 3 through the second transfer mechanism 23, and the pipe fitting transfer mechanism 31 is driven by the transfer drive mechanism 32 to move from the second station B to the third station C and then conveyed to the drawing device 4 to complete the drawing operation of the pipe fittings.

[0062] Specifically, taking the Figure 1 layout attached as an example to illustrate the action relationship of the present invention. First, the pipe fittings are continuously conveyed to the first station A through the feeding mechanism 11 of the feeding device 1. The first transfer mechanism 21 of the corresponding heading transfer device 2 clamps the pipe fittings conveyed to the first station A and moves them to the negative Y side, so that the ends of the pipe fittings enter the heading mechanism 22. After the ends of the pipe fittings are reduced by the heading mechanism 22, the first transfer mechanism 21 moves and places the pipe fittings into the second transfer mechanism 23. At this time, the ends of the pipe fittings placed in the second transfer mechanism 23 facing the negative Y end are reduced, and during the subsequent transfer process, the orientation of the reduced ends of the pipe fittings does not change.

[0063] Secondly, the second transfer mechanism 23 conveys the pipe fittings with reduced ends to the pipe fitting transfer mechanism 31 of the transfer device 3 that is waiting at the second station B. The pipe fitting transfer mechanism 31 moves from the second station B to the third station C through the drive of the transfer drive mechanism 32.

[0064] Finally, the pipe fittings with reduced ends are rhythmically pushed from the pipe fitting transfer mechanism 31 so that their reduced ends pass through the core-pulling mechanism 41 of the drawing device 4 and are then clamped by the drawing traction mechanism 42, and gradually move towards the negative Y end through the drawing traction mechanism 42 to realize the automatic drawing operation of the pipe fittings.

[0065] Furthermore, referring to Figure 2 and 3 , the feeding mechanism 11 includes a conveying component 111 for conveying the pipe fittings to the first station A, and a clamping and flipping component 112 for clamping and flipping the pipe fittings located at the first station A one by one by 90 degrees; that is, after flipping the pipe fittings by 90 degrees, their thickness end faces are in the up and down state, which is convenient for reducing the ends.

[0066] The conveying assembly 111 includes a conveying line body 1111 arranged along the X direction and a pipe conveyor belt 1112 wound around the conveying line body 1111. A plurality of material grooves 1113 arranged along the Y direction are spaced apart on the pipe conveyor belt 1112. In this embodiment, two groups of conveying line bodies 1111 are arranged at intervals along the Y direction to ensure the smooth feeding of the pipes. The width of the material groove 1113 matches the width of the pipes to ensure that the pipes are conveyed to the first station A one by one.

[0067] The clamping and flipping assembly 112 includes a flipping jaw 1121, a driven rod 1122, a flipping gear 1123, a rack 1124, and a rack driving mechanism 1125. The driven rod 1122 is arranged along the Y direction. Two groups of flipping jaws 1121 are respectively fixedly arranged at both ends of the driven rod 1122. The flipping gear 1123 is sleeved on the middle of the driven rod 1122. The rack 1124 is arranged along the Z direction and is in transmission cooperation with the flipping gear 1123. The rack driving mechanism 1125 is used to drive the rack 1124 to reciprocate along the Z direction. Among them, the clamping and flipping assembly 112 is arranged on the positive X side of the conveying assembly 111 through a mounting plate 1126. The rack driving mechanism 1125 can be selected from a motor or a cylinder. Taking the motor as an example, the motor is installed on the positive X side of the mounting plate 1126. The lower end of the rack 1124 is connected to the output shaft of the motor through a transmission plate 1127. A linear guide rail 11261 is arranged along the Z direction on the mounting plate 1126. A slider 11241 matching the linear guide rail 11261 is arranged on the side of the rack 1124 away from the teeth. In addition, both ends of the driven rod 1122 are positioned by first positioning bearings 11221. When the motor drives the rack 1124 to move upward, the flipping gear 1123 engaged with the rack 1124 rotates counterclockwise, thereby driving the driven rod 1122 to rotate counterclockwise, and further driving the flipping jaws 1121 at both ends of the driven rod 1122 to flip upward simultaneously until the clamping mouths of the flipping jaws 1121 face upward; conversely, the flipping gear 1123 rotates clockwise, and the flipping jaws 1121 with the clamping mouths facing upward rotate clockwise until the clamping mouths are in a horizontal state. Here, when the flipping jaws 1121 are in a horizontal state, the conveying line body 1111 of the feeding mechanism 11 just conveys the pipes and enters the two flipping jaws 1121. To ensure that the flipping jaws 1121 can smoothly clamp the pipes, the two flipping jaws 1121 are symmetrically arranged outside the two groups of conveying line bodies 1111.

[0068] Of course, during the entire operation process, the pipes are in a lying state due to their own weight, and the automatic feeding, transfer, transfer, and drawing operations can also be carried out through the present invention.

[0069] Further, refer to Figure 4 and 5, the first transfer mechanism 21 includes a transfer clamping assembly 211 for clamping the pipe fittings flipped 90 degrees by the clamping and flipping assembly 112, and a moving module 212 for driving the transfer clamping assembly 211 to reciprocate in the X, Y, and Z directions respectively.

[0070] Among them, the transfer clamping assembly 211 includes a jaw connection bracket 2111 arranged along the Y direction, and transfer jaws 2112 provided on the lower sides of both ends of the jaw connection bracket 2111, that is, the transfer jaws 2112 always keep the clamping opening facing down during the movement.

[0071] The moving module 212 includes an X-direction slide rail 2121 arranged along the X direction and a Y-direction slide rail 2122 arranged along the Y direction. The X-direction slide rail 2121 is driven by a first driving motor 2123 to reciprocate on the Y-direction slide rail 2122; in the middle of the upper side of the jaw connection bracket 2111, there is a Z-direction driving cylinder 2124 for driving the jaw connection bracket 2111 to reciprocate up and down. The Z-direction driving cylinder 2124 is slidably connected to the X-direction slide rail 2121 through a slider 2125 and is driven by a second driving motor 2126 to reciprocate on the X-direction slide rail 2121. That is, the transfer clamping assembly 211 is lifted upward by a certain height by the drive of the Z-direction driving cylinder 2124, and this height enables the transfer jaws 2112 to avoid the flipping jaws 1121 that are clamping and in a flipped state with pipe fittings. Then, the second driving motor 2126 drives the transfer clamping assembly 211 to move along the X-direction slide rail 2121 to directly above the flipping jaws 1121, and clamps the pipe fittings on the flipping jaws 1121 through the transfer jaws 2112. Then, it moves along the X-direction slide rail 2121 to the positive Y side of the heading mechanism 22, and finally, the first driving motor 2123 drives it to move the transfer jaws 2112 with the clamped pipe fittings along the Y-direction slide rail 2122 towards the heading mechanism 22.

[0072] Further, referring to Figure 6 and 7 , the heading mechanism 22 includes a guiding component 221 and a heading component 222 arranged in sequence on the negative Y side of the first station A. The guiding component 221 has a guiding slot hole 2211 that allows the end of the pipe fitting to pass through. The heading component 222 includes a support frame 2221. On the support frame 2221, there is a clamping grinder for clamping the pipe fitting along its thickness direction, and a heading grinder for reducing the end of the pipe fitting along the width direction.

[0073] Among them, the clamping mold includes two groups of clamping arms 2222 arranged along the X direction and slidably connected to the two side walls of the support frame 2221 respectively. Clamping cylinders 2223 are respectively arranged at the relatively far ends of the two clamping arms 2222. The clamping cylinders 2223 are used to drive the clamping arms 2222 to move relatively closer to clamp the pipe fittings or move away to loosen the pipe fittings; the heading mold includes two groups of heading members 2224 arranged along the Z direction and slidably connected to the upper and lower walls of the support frame 2221 respectively. Heading cylinders 2225 are respectively arranged at the relatively far ends of the two heading members 2224. The heading cylinders 2225 are used to drive the heading members 2224 to move relatively closer to reduce the end of the pipe fitting or move away from the pipe fitting. That is, when the intermediate clamping jaw 2112 clamps the pipe fitting and moves it towards the heading mechanism 22, the setting of the guiding assembly 221 helps the end of the pipe fitting to enter the guiding groove hole 2211 and reach a horizontal state when passing through the guiding groove hole 2211. Then, the end of the pipe fitting is positioned by the clamping molds on the left and right sides. The fixed end of the pipe fitting is simultaneously squeezed towards the middle by the heading molds arranged up and down to reduce its end, and at the same time, the thickness of the end does not deform.

[0074] Further, referring to Figure 4 , the second intermediate mechanism 23 includes an intermediate guiding chute 231 arranged along the Y direction and an intermediate pushing assembly 232 for pushing the pipe fittings placed in the intermediate guiding chute 231 to the second station B. The intermediate guiding chute 231 has two relatively arranged guiding plates 2311, and a number of conveying rollers 2312 are arranged at intervals on the guiding plates 2311. Among them, an adjusting structure 2313 for adjusting the distance between the two guiding plates 2311 is arranged at the lower end of the intermediate guiding chute 231, so as to meet the use of pipe fittings with different thickness dimensions and improve the applicability of the present invention.

[0075] In addition, the adjusting structure 2313 is arranged at the lower part of the guiding plate 2311 close to the feeding device 1. By rotating the adjusting structure 2313, the guiding plate 2311 can be moved along the X direction, so as to achieve the purpose of adjusting the width of the chute. At the same time, guide rail structures 2314 are respectively arranged on both sides of the lower end of the guiding plate 2311 to facilitate the smooth movement of the guiding plate during the adjustment process. At the same time, the bottom of the intermediate guiding chute 231 is provided with chute rollers to ensure the smooth passage of the pipe fittings in the intermediate guiding chute 231.

[0076] The transfer and pushing component 232 includes a transfer and pushing rod 2321 and a sprocket drive group for driving the transfer and pushing rod 2321 to reciprocate along the Y direction; the sprocket drive group includes two synchronous belt pulleys 2322 arranged at intervals along the Y direction, a synchronous belt 2323 sleeved on the two synchronous belt pulleys 2322, and a third drive motor 2324 for driving the synchronous belt pulley 2322 to rotate forward or backward to drive the transfer and pushing rod 2321 to reciprocate between the Y negative end and the positive end of the transfer and guiding groove 231. That is, the third drive motor 2324 drives the synchronous belt pulley 2322 to rotate, so that the transfer and pushing rod 2321 reciprocally translates between the Y negative end and the positive end of the transfer and guiding groove 231 along the upper part of the synchronous belt 2323. The transfer and pushing rod 2321 has a free end extending into the transfer and guiding groove 231, and the width of the free end matches the groove width of the transfer and guiding groove 231. To ensure the stability of the transfer and pushing rod 2321 during pushing, guide rails 2325 parallel to it are respectively arranged on the upper and lower sides of the synchronous belt 2323. A guide bracket 2326 is slidably fitted on the two guide rails 2325. The guide bracket 2326 is fixedly connected to the upper part of the synchronous belt 2323. The other end of the transfer and pushing rod 2321 is fixedly connected to the guide bracket 2326 through a right-angle fixing bracket 2327.

[0077] In addition, position sensors are respectively arranged at both ends of the guide rail 2326 to monitor the traveling distance and staying position of the transfer and pushing rod 2321.

[0078] Further, referring to Figures 8 to 10 , the pipe fitting transfer mechanism 31 includes a transfer and loading chute component 311 arranged along the Y direction and a transfer and pushing component 312 arranged at the Y positive end of the transfer and loading chute component 311; the transfer and loading chute component 311 includes a transfer and loading chute 3111 arranged along the Y direction, and a plurality of guide rollers 3112 arranged in a predetermined manner are respectively provided on the opposite sides of the transfer and loading chute 3111; the transfer and pushing component 312 includes a transfer and pushing rod 3121 and a fourth drive motor 3122 for driving the transfer and pushing rod 3121 to reciprocate along the Y direction.

[0079] That is, when the transfer and loading chute component 311 is located at the third station C, the fourth drive motor 3122 is used to drive the transfer and pushing rod 3121 on the transfer and loading chute component 311 to push the pipe fittings located in the transfer and loading chute 3111 into the drawing device 4.

[0080] The setting of the transfer device 3 enables the drawing device 4 and the heading transfer device 2 to reach a balanced production state, ensuring the continuous operation of the production equipment.

[0081] Furthermore, in the embodiments of the present invention, two sets of pipe fitting transfer mechanisms 31 are provided. One set of pipe fitting transfer mechanisms 31 linearly reciprocates between the second station B and the third station C along the X direction driven by the fifth driving motor 33, and the other set of pipe fitting transfer mechanisms 31 reciprocates between the second station B and the third station C along the Z direction and the X direction driven by the transfer driving mechanism 32. That is, the first set of pipe fitting transfer mechanisms 31 only performs translational operations along the X direction, and the second set of pipe fitting transfer mechanisms 31, in order not to interfere with the movement of the first set of pipe fitting transfer mechanisms 31, is set to be able to lift and translate in two motion states.

[0082] Specifically, referring to Figure 9 , the transfer driving mechanism 32 includes two transfer fixing frames 321 arranged at intervals along the Y direction and used to fix the pipe fitting transfer mechanism 31. Lifting driving components 322 are respectively provided on the two transfer fixing frames 321, and the lifting driving components 322 are used to drive the two transfer fixing frames 321 to rise or fall synchronously; the two lifting driving components 322 are fixedly connected to the translation support 323 through the translation driving component 324, and the translation driving component 324 is used to drive the translation support 323 to drive the pipe fitting transfer mechanism 31 to reciprocate between the second station B and the third station C along the X direction.

[0083] Of course, based on the design concept of the transfer device of the present invention, the transfer driving mechanism 32 can also adopt the driving mode of a vertical turntable. Multiple sets of pipe fitting transfer mechanisms 31 are arranged at intervals along the circumferential direction of the turntable, and the rotation of the turntable drives the pipe fitting transfer mechanisms 31 to reciprocate between the second station B and the third station C. At the same time, to ensure that the pipe fitting transfer mechanism 31 always maintains a horizontal state when moving along the circumferential direction of the turntable, a damping device is provided between the transfer trough assembly 311 and the turntable to ensure that the transfer trough assembly 311 always maintains a horizontal state.

[0084] Furthermore, referring to Figures 11 to 14 , the drawing die base mechanism 41 includes a die core base 411 provided on the negative Y side of the third station C, and a drawing die core 412 provided on the die core base 411. The drawing die core 412 is in an overfit with the pipe fitting. Among them, the drawing die core 412 is detachably connected to the die core base 411, and the corresponding drawing die core 412 can be replaced according to the pipe fitting specifications.

[0085] The drawing traction mechanism 42 is arranged on the negative Y side of the drawing die base mechanism 41, and includes a drawing sprocket group 421 arranged along the Y direction, a drawing tractor 422 meshed and driven with the drawing sprocket group 421, and a servo motor 423 for driving the drawing tractor 422 to reciprocate on the drawing sprocket group 421.

[0086] The drawing tractor 422 is provided with a drawing jaw 4221 disposed toward the side of the drawing die base mechanism 41 and an action driving motor 4222 for driving the drawing jaw 4221 to open or clamp.

[0087] On one side wall of the drawing base 43, a plurality of dial rod assemblies 44 are arranged at intervals along the moving direction of the drawing tractor 422. The dial rod assemblies 44 are used to limit the levelness of the pipe fittings during the drawing operation; each dial rod assembly 44 includes a rotating shaft 441 arranged in the vertical direction, a dial rod 442 arranged at the upper end of the rotating shaft 441, and a sixth driving motor 443 for driving the rotating shaft 441 to rotate. The rotating shaft 441 is rotatably connected to one side wall of the drawing base 43 through a second positioning bearing 444. Among them, the output shaft of the sixth driving motor 443 is connected to the lower end of the rotating shaft 441 through a guide block. The guide block is provided with an oval hole inclined from the outside of the output shaft toward one side of the rotating shaft 441. When the output shaft of the sixth driving motor 443 moves linearly back and forth, the transmission rod on the output shaft moves along the oval hole, thereby rotating the rotating shaft, and further rotating the dial rod above or away from the pipe fitting. That is to say, when the drawing tractor 422 draws the pipe fitting, when the drawing tractor 422 moves to the Y negative side of the dial rod assembly 44, the sixth driving motor 443 drives the rotating shaft 441 to rotate, so that the dial rod 442 rotates above the pipe fitting to press and cover the drawn pipe fitting to prevent the pipe fitting from warping during the drawing process. When the drawing of the pipe fitting is completed and the drawing tractor 422 moves to the Y positive side, the rotating shaft 441 rotates back and the dial rod resets.

[0088] Specifically, the operation process of the embodiment of the automatic pipe fitting head-forming drawing integrated machine provided by the present invention is as follows.

[0089] Initial state: The clamping opening of the flipping jaw 1121 of the clamping and flipping assembly 112 is in a horizontal state and faces the side of the feeding mechanism 11. The transfer clamping jaw 2112 of the transfer clamping assembly 211 is located on the first station A and directly above the flipping jaw 1121. The transfer pushing rod 2321 of the transfer pushing assembly 232 is located at the Y negative end of the transfer guiding groove 231; the first group of pipe fitting transfer mechanisms 31 is located on the second station B, and the Y negative end of the transfer trough 3111 of the pipe fitting transfer mechanism 31 is in spatial butt joint with the Y positive end of the transfer guiding groove 231. The second group of pipe fitting transfer mechanisms 31 is located directly above the first group of pipe fitting transfer mechanisms 31; the drawing jaw 4221 of the drawing tractor 422 is close to the drawing die core 412 on the die core base 411.

[0090] During operation:

[0091] Step 1, the pipe fittings are transported to the first station A on the conveying line body 1111. The flipping jaw 1121 flips each of them by 90° and then transfers them to the transfer clamping jaw 2112, and then returns to the initial state and repeats the above actions;

[0092] In Step 2, after the transfer gripper 2112 receives the pipe fitting that has been flipped 90° by the flipping gripper 1121, through position adjustment in the X, Y, and Z directions, the end of the pipe fitting can smoothly pass through the guiding slot hole 2211 of the heading mechanism 22. Then, the clamping mold clamps the end of the pipe fitting from both sides in the X direction. After that, the heading and grinding mold reduces the upper and lower sides of the end of the pipe fitting in the Z direction to complete the end reduction operation. Then, the transfer gripper 2112 holds the pipe fitting with the reduced end and moves it to be placed in the transfer guide slot 231. After that, the transfer gripper 2112 returns to its initial state and repeats the above actions;

[0093] In Step 3, the transfer pusher rod 2321 pushes the pipe fitting with the reduced end placed in the transfer guide slot 231 towards the positive Y end. During the pushing process, the positive Y end of the pipe fitting enters the transfer slot 3111 from the negative Y end of the first group of transfer slots 3111. When the transfer pusher rod 2321 moves to the positive Y end of the transfer guide slot 231, the pipe fitting is transferred into the transfer slot 3111. After that, the transfer pusher rod 2321 returns to its initial state and repeats the above actions;

[0094] In Step 4, after the first group of pipe fitting transfer mechanisms 31 in Step 3 moves from the second station B to the third station C, the transfer pusher rod 3121 pushes the pipe fitting in the transfer slot 3111 along the negative Y direction so that its reduced end passes through the drawing die core 412 on the die core base 411. At the same time, the transfer drive mechanism 32 drives the second group of pipe fitting transfer mechanisms 31 to descend so that the transfer slot 3111 on it is docked with the transfer guide slot 231;

[0095] In Step 5, after the pipe fitting in the transfer slot 3111 of the first group of pipe fitting transfer mechanisms 31 in Step 4 passes through the drawing die core 412 on the die core base 411, the drawing gripper 4221 on the drawing tractor 422 holds the end of the pipe fitting and moves it along the negative Y direction to draw the pipe fitting. After the pipe fitting in the first group of pipe fitting transfer mechanisms 31 completes the drawing operation, it returns to its initial state and repeats the above actions;

[0096] While the first group of pipe fitting transfer mechanisms 31 returns to its initial state, the second group of pipe fitting transfer mechanisms 31 is lifted and moves along the positive X direction to the third station C and then descends to a height where it can be docked with the drawing die core 412, and the pipe fitting is drawn through the drawing device. After completion, this group of pipe fitting transfer mechanisms 31 forms a cyclic docking with the first group of pipe fitting transfer mechanisms 31 through the steps of rising, translating, and descending, so as to realize the continuous operation of the drawing device without interruption.

[0097] The above steps are cycled to realize the continuous operation of feeding, heading, transferring, and drawing of the pipe fitting.

[0098] The automatic pipe fitting heading and drawing forming integrated machine provided by the present invention continuously supplies pipe fittings to the rear-end device through a feeding device. The first transfer mechanism of the heading transfer device clamps and moves the pipe fittings, and the heading mechanism automatically performs a heading operation on the end of the pipe fittings. The pipe fittings with reduced ends are transferred to the transfer device through the second transfer mechanism, and are transferred to the drawing device through the transfer device. Finally, the pipe fittings are drawn through the mutual cooperation of the core-pulling mechanism and the drawing traction mechanism of the drawing device, realizing the full-automatic continuous operation of automatic feeding, heading, transfer, and drawing of the pipe fittings, improving production efficiency, and saving labor costs.

[0099] Many specific details are set forth in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited by the specific embodiments disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. All simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. An integrated automatic pipe end-heading and drawing forming machine. Define two mutually perpendicular directions in a plane as the X direction and the Y direction respectively, and the vertical direction as the Z direction. It is characterized in that it includes: A feeding device (1), having a first station (A), and a feeding mechanism (11) for continuously supplying pipes to the first station (A); A heading transfer device (2), arranged on the positive X side of the first station (A), including a first transfer mechanism (21) and a second transfer mechanism (23) for transferring pipes, and a heading mechanism (22) for reducing the end of the pipe. The first transfer mechanism (21) is used to move the pipe located on the first station (A) into the heading mechanism (22), and after reducing the end of the pipe through the heading mechanism (22), move it onto the second transfer mechanism (23). The second transfer mechanism (23) is used to move the pipe with the reduced end placed therein in the Y direction; A transfer device (3), arranged on the positive Y side of the heading transfer device (2), having a second station (B) and a third station (C) formed on the positive X side of the second station (B). The transfer device (3) includes at least one set of pipe transfer mechanisms (31) docked with the second transfer mechanism (23), and a transfer driving mechanism (32) for driving the pipe transfer mechanisms (31) to reciprocate between the second station (B) and the third station (C); A drawing device (4), arranged on the negative Y side of the third station (C), including a core-pulling mechanism (41) docked with the pipe transfer mechanism (31), and a drawing traction mechanism (42) cooperating with the core-pulling mechanism (41) to clamp and draw the pipe; Among them, the pipe to be processed is conveyed to the first station (A) through the feeding mechanism (11) of the feeding device (1), then moved into the heading mechanism (22) through the first transfer mechanism (21) of the heading transfer device (2), and after reducing the end of the pipe through the heading mechanism (22), moved onto the second transfer mechanism (23); The pipe with the reduced end is conveyed to the pipe transfer mechanism (31) at the second station (B) of the transfer device (3) through the second transfer mechanism (23), and the transfer driving mechanism (32) drives the pipe transfer mechanism (31) to move from the second station (B) to the third station (C) and then convey it to the drawing device (4) to complete the drawing operation of the pipe.

2. The integrated automatic pipe end-heading and drawing forming machine according to claim 1, it is characterized in that: The feeding mechanism (11) includes a conveying component (111) for conveying the pipe to the first station (A), and a clamping and flipping component (112) for clamping and flipping the pipe located on the first station (A) one by one by 90 degrees; The conveying assembly (111) includes a conveying line body (1111) arranged along the X direction and a pipe belt (1112) wound around the conveying line body (1111). A plurality of material grooves (1113) arranged along the Y direction are spaced apart on the pipe belt (1112). The clamping and flipping assembly (112) includes a flipping jaw (1121), a driven rod (1122), a flipping gear (1123), a rack (1124), and a rack driving mechanism (1125). The driven rod (1122) is arranged along the Y direction. Two groups of the flipping jaws (1121) are respectively arranged at both ends of the driven rod (1122). The flipping gear (1123) is sleeved in the middle of the driven rod (1122). The rack (1124) is arranged along the Z direction and is in transmission cooperation with the flipping gear (1123). The rack driving mechanism (1125) is used to drive the rack (1124) to reciprocate along the Z direction.

3. The automatic pipe end-heading and drawing forming machine according to claim 2, characterized in that: The first transfer mechanism (21) includes a transfer clamping assembly (211) for clamping the pipe fittings flipped 90 degrees by the clamping and flipping assembly (112), and a moving module (212) for driving the transfer clamping assembly (211) to reciprocate respectively in the X, Y, and Z directions; The transfer clamping assembly (211) includes a jaw connecting bracket (2111) arranged along the Y direction, and transfer jaws (2112) arranged on the lower sides of both ends of the jaw connecting bracket (2111); The moving module (212) includes an X-direction slide rail (2121) arranged along the X direction and a Y-direction slide rail (2122) arranged along the Y direction. The X-direction slide rail (2121) is driven by a first driving motor (2123) to reciprocate on the Y-direction slide rail (2122).

4. The automatic pipe end-heading and drawing forming machine according to claim 3, characterized in that: A Z-direction driving cylinder (2124) for driving the jaw connecting bracket (2111) to reciprocate up and down is arranged in the middle of the upper side of the jaw connecting bracket (2111). The Z-direction driving cylinder (2124) is slidably connected to the X-direction slide rail (2121) through a slider (2125) and is driven by a second driving motor (2126) to reciprocate on the X-direction slide rail (2121).

5. The automatic pipe end-heading and drawing forming machine according to claim 4, characterized in that: The end-heading mechanism (22) includes a guiding component (221) and an end-heading component (222) arranged in sequence along the negative Y side of the first working station (A). The guiding component (221) has a guiding groove hole (2211) allowing the end of the pipe fitting to pass through. The end-heading component (222) includes a support frame body (2221). A clamping mold for clamping the pipe fitting along its thickness direction and an end-heading mold for reducing the width of the end of the pipe fitting are arranged on the support frame body (2221).

6. The automatic pipe fitting heading and drawing forming integrated machine according to claim 5, characterized in that: the clamping mold includes two groups of clamping arms (2222) arranged along the X direction and slidably connected to the two side walls of the support frame (2221) respectively. Clamping cylinders (2223) are respectively arranged at the relatively far ends of the two clamping arms (2222). The clamping cylinders (2223) are used to drive the clamping arms (2222) to move relatively closer to clamp the pipe fitting or move away to loosen the pipe fitting; the heading mold includes two groups of heading parts (2224) arranged along the Z direction and slidably connected to the upper and lower walls of the support frame (2221) respectively. Heading cylinders (2225) are respectively arranged at the relatively far ends of the two heading parts (2224). The heading cylinders (2225) are used to drive the heading parts (2224) to move relatively closer to reduce the end of the pipe fitting.

7. The automatic pipe fitting heading and drawing forming integrated machine according to claim 6, characterized in that: the second transfer mechanism (23) includes a transfer guide groove (231) arranged along the Y direction and a transfer pushing component (232) for pushing the pipe fitting placed in the transfer guide groove (231) to the second station (B). The transfer pushing component (232) includes a transfer pushing rod (2321) and a sprocket drive group for driving the transfer pushing rod (2321) to reciprocate along the Y direction; the transfer guide groove (231) has two relatively arranged guide plates (2311), and a plurality of conveying roller wheels (2312) are arranged at intervals on the guide plates (2311).

8. The automatic pipe fitting heading and drawing forming integrated machine according to claim 7, characterized in that: the sprocket drive group includes two synchronous belt wheels (2322) arranged at intervals along the Y direction, a synchronous belt (2323) sleeved on the two synchronous belt wheels (2322), and a third drive motor (2324) for driving the synchronous belt wheels (2322) to rotate forward or backward to drive the transfer pushing rod (2321) to reciprocate between the Y negative end and the positive end of the transfer guide groove (231).

9. The automatic pipe fitting heading and drawing forming integrated machine according to claim 1, characterized in that: the pipe fitting transfer mechanism (31) includes a transfer trough component (311) arranged along the Y direction and a transfer pushing component (312) arranged at the Y positive end of the transfer trough component (311); the transfer trough component (311) includes a transfer trough (3111) arranged along the Y direction. The transfer pushing component (312) includes a transfer pushing rod (3121) and a fourth drive motor (3122) for driving the transfer pushing rod (3121) to reciprocate along the Y direction. When the transfer trough component (311) is located at the third station (C), the fourth drive motor (3122) is used to drive the transfer pushing rod (3121) on the transfer trough component (311) to push the pipe fitting located in the transfer trough (3111) into the drawing device (4). On opposite sides of the transfer chute (3111), a number of guide rollers (3112) are provided and arranged in a predetermined manner.

10. The integrated automatic pipe fitting heading and drawing forming machine according to claim 9, characterized in that: Two sets of pipe fitting transfer mechanisms (31) are provided. One set of the pipe fitting transfer mechanisms (31) linearly reciprocates between the second station (B) and the third station (C) along the X direction driven by a fifth driving motor (33), and the other set of the pipe fitting transfer mechanisms (31) reciprocates between the second station (B) and the third station (C) along the Z direction and the X direction through the transfer driving mechanism (32).

11. The integrated automatic pipe fitting heading and drawing forming machine according to claim 10, characterized in that: The transfer driving mechanism (32) includes two transfer fixing frames (321) arranged at intervals along the Y direction and used for fixing the pipe fitting transfer mechanism (31). Lifting driving components (322) are respectively provided on the two transfer fixing frames (321), and the lifting driving components (322) are used to drive the two transfer fixing frames (321) to rise or fall synchronously; The two lifting driving components (322) are fixedly connected to a translation support (323) and a translation driving component (324). The translation driving component (324) is used to drive the translation support (323) to drive the pipe fitting transfer mechanism (31) to reciprocate between the second station (B) and the third station (C) along the X direction.

12. The integrated automatic pipe fitting heading and drawing forming machine according to claim 1, characterized in that: The drawing die base mechanism (41) includes a Y negative side die core base (411) provided at the third station (C), and a drawing die (412) provided on the die core base (411). The drawing die (412) is in an overfit with the pipe fitting; The drawing traction mechanism (42) is arranged on the Y negative side of the drawing die base mechanism (41) through a drawing base (43), and includes a drawing sprocket group (421) arranged along the Y direction, a drawing tractor (422) meshed and driven with the drawing sprocket group (421), and a servo motor (423) used to drive the drawing tractor (422) to reciprocate on the drawing base (43); On the drawing tractor (422), a drawing jaw (4221) arranged towards the drawing die base mechanism (41) and an action driving motor (4222) for driving the drawing jaw (4221) to open or clamp are provided.

13. The integrated automatic pipe fitting heading and drawing forming machine according to claim 12, characterized in that: On one side side wall of the drawing base (43), a plurality of dial rod assemblies (44) are arranged at intervals along the Y direction, and the dial rod assemblies (44) are used to limit the levelness of the pipe fitting during the drawing operation. Each of the lever assemblies (44) includes a rotating shaft (441) arranged in the vertical direction, a lever (442) provided at the upper end of the rotating shaft (441), and a sixth driving motor (443) for driving the rotation of the rotating shaft (441). The rotating shaft (441) is rotatably connected to a side wall of one side of the drawing base (43) through a second positioning bearing (444).

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