A pipe gear rolling machine and gear rolling method

Abstract

The present invention discloses a pipe gear rolling machine and a gear rolling method, which belong to the technical field of pipe processing. The pipe gear rolling machine includes a pipe conveying mechanism, a gear rolling main machine and a through-rod conveying mechanism. The pipe conveying mechanism includes a pipe conveying frame, a pusher assembly arranged on the pipe conveying frame and a plurality of pipe roller assemblies arranged along the length direction of the pipe conveying frame. The pusher assembly includes a push rod and a push rod driving mechanism. A follower pipe head is rotatably arranged on the push rod, and a ring table is arranged on the follower pipe head. The push rod driving mechanism includes a driving wheel, a driven wheel, a synchronous belt and a push rod driving motor, and the push rod driving motor is connected to the driving wheel through a clutch. The push rod of the present invention can push the pipe to be loaded, the through-rod can support the pipe, and the pipe can maintain the insertion fit with the push rod when the pipe is discharged. The push rod is passively pushed back from the pipe, which reduces or even avoids the jumping, noise and the throwing out of the cutting fluid in the pipe during the processing and discharge of the pipe, thereby ensuring the tooth rolling quality of the pipe.

Description

Technical Field

[0001] The invention relates to a pipe gear rolling machine and a gear rolling method, belonging to the technical field of pipe processing. Background Art

[0002] In the field of refrigeration technology, different tooth shapes are generally processed on heat exchange tubes in order to increase the heat exchange area of ​​the heat exchange tubes. At the same time, the tooth shape is used to enhance the disturbance of the medium during heat exchange to enhance the heat exchange effect.

[0003] The equipment used for processing the tooth profile is a gear rolling machine. The gear rolling machine includes a gear rolling main machine for processing the tooth profile of the pipe fitting at the rolling station. For example, the Chinese utility model patent with the authorization announcement number CN209737141U discloses a CNC fin tube tooth forming device, which includes a wire rolling mechanism, and the wire rolling mechanism includes multiple cutters. The servo electric cylinder is used to drive the multiple cutters to simultaneously feed or retract through the feed mechanism to realize the processing of the tooth profile on the surface of the pipe fitting.

[0004] Although the gear rolling process of the pipe fittings has been automated at the rolling station under the action of the gear rolling main machine, the gear rolling machine must not only be able to perform the gear rolling process at the rolling station, but also require that the conveying of the pipe fittings be matched with the gear rolling rhythm of the pipe fittings, so as to realize the automated gear rolling operation of the pipe fittings.

[0005] The existing conveying device for rolled gear pipe fittings, such as a feeding device for a copper tube rolling machine disclosed in the Chinese utility model patent with the authorization announcement number CN209849548U, uses a control rod to insert into the pipe fitting to be processed, and uses a driving device to send the pipe fitting to the rolling station for rolling. During the rolling process, the control rod is always connected to the pipe fitting. After the processing is completed, the driving device reverses and drives the control rod to send the pipe fitting back to the bearing station. In the actual processing of the gear rolling machine, the cutter of the gear rolling main machine not only processes the tooth shape on the blank pipe, but also the blank pipe can be discharged while rotating under the action of the cutter. It is difficult for the driving device in the feeding device to match the discharge speed of the tooth-shaped processed pipe fitting, and the unmatched pipe fitting discharge speed will cause the pipe fitting to be separated from the control rod. Once separated, the pipe fitting rotates at a high speed during the tooth rolling discharge process, and the first discharge end of the pipe fitting not only jumps and makes a lot of noise, but also has serious cutting fluid throwing out, which will affect the quality of the blank pipe tooth rolling processing. Therefore, it is necessary to improve the existing gear rolling machine so that the conveying of pipe fittings can match the pipe gear rolling rhythm of the gear rolling main machine, realize the automated gear rolling operation of pipe fittings, and thus obtain high-quality gear rolled pipe fittings. Summary of the invention

[0006] The invention aims at solving the deficiencies in the prior art and provides a pipe gear rolling machine and a gear rolling method.

[0007] The technical solution of the present invention to solve the above technical problems is as follows: a pipe gear rolling machine, comprising a gear rolling main machine, a pipe conveying mechanism and a mandrel conveying mechanism, wherein the pipe conveying mechanism is arranged on one side of the gear rolling main machine, and the mandrel conveying mechanism is arranged on the other side of the gear rolling main machine;

[0008] The pipe conveying mechanism comprises a pipe conveying frame, a pushing assembly arranged on the pipe conveying frame and a plurality of pipe roller assemblies arranged along the length direction of the pipe conveying frame, the pushing assembly comprises a push rod and a push rod driving mechanism, a follower pipe head is rotatably arranged on the push rod, a ring table for positioning the pipe is provided on the follower pipe head, the push rod driving mechanism comprises a driving wheel, a driven wheel, a synchronous belt wrapped around the driving wheel and the driven wheel and a push rod driving motor, the push rod driving motor is connected to the driving wheel through a clutch, the clutch engages the power transmission between the push rod driving motor and the driving wheel when the pipe is loaded, and the clutch cuts off the power transmission between the push rod driving motor and the driving wheel when the pipe is discharged, and the push rod is connected to the synchronous belt;

[0009] The through-rod conveying mechanism includes a rod conveying frame, a through-rod arranged on the rod conveying frame, a through-rod pushing cylinder for pushing the through-rod to move, and a plurality of through-rod roller assemblies arranged along the length direction of the rod conveying frame. The through-rod is inserted into the pipe fitting for supporting the pipe fitting, and the free end of the through-rod and the free end of the pushing rod are both pointed structures.

[0010] The beneficial effects of this technical solution are as follows: in order to ensure the accuracy of the push rod and the pipe fittings in threading the pipe, the rod head of the push rod is set to a pointed structure to ensure that the push rod enters the pipe smoothly. After the pipe fitting enters the rod head, it will continue to be threaded on the follower pipe head. The ring platform of the follower pipe head can limit the pipe end of the pipe fitting, and the ring platform is used to push the pipe fitting forward on the pipe fitting roller assembly for feeding. At the same time, when the tooth-rolling discharging pipe fittings rotate, the follower pipe head can also rotate with the pipe fittings, reducing the wear between the pipe fittings and the follower pipe head, and meeting the quality requirements of the pipe fittings; the clutch engages the power transmission between the push rod drive motor and the driving wheel when the pipe fittings are fed, and the driving wheel is in the middle of the driving wheel when pushing the material. The push rod drives the motor to rotate, and pushes the pipe toward the rolling station. After the pipe is delivered to the position, the clutch cuts off the power transmission between the push rod drive motor and the driving wheel. The gear rolling process is to discharge the material while processing. The pipe is rotated to discharge the material. The pipe end of the pipe cooperates with the follower pipe head, and the pipe pushes the push rod back. The follower pipe head keeps the constraint on the pipe end, which reduces the vibration of the pipe during processing and discharging, reduces noise, especially the vibration of the free end of the pipe. At the same time, after the clutch cuts off the power transmission, the push rod is reset under the push of the pipe, and the follower pipe head is always in cooperation with the pipe insertion, which can also reduce or even avoid the throwing out of the cutting fluid in the pipe. Before the pipe is forwarded for loading, the through-rod will first move backward to the docking position to wait for docking with the pipe, and the push rod will push the pipe forward. The front end of the pipe will continue to move after being sleeved with the through-rod at the docking position, and the through-rod moves forward to reset. The rear end of the through-rod returns to the rolling station, and the pipe continues to move until the entire pipe passes through the through-rod. The rear end of the pipe moves to the rolling station, and the movement of the pipe stops. The clutch cuts off the power transmission, and the through-rod is sleeved in the pipe to support the pipe. The gear rolling main machine can perform gear rolling on the pipe. The pipe is discharging while gear rolling, and the follow-up pipe head will constrain the pipe end of the pipe, reducing the jumping of the pipe. The push rod will move backward under the push of the pipe; the clutch ensures that the push rod drive mechanism will not interfere with the follow-up return of the push rod, which not only realizes the constraint on the pipe end of the pipe, but also ensures that the push rod can move backward in the same rhythm as the pipe. The invention has a simple structure and is easy to operate. The push rod can push the pipe fitting to realize the loading of the pipe fitting, the through rod can be inserted into the pipe fitting to realize the support of the tooth-rolled pipe fitting, and the pipe end can maintain the insertion cooperation with the push rod when the pipe fitting is discharged. The push rod is passively pushed back by the pipe fitting, thereby reducing or even avoiding the jumping and noise when the pipe fitting is processed and discharged, reducing or even avoiding the throwing out of the cutting fluid in the pipe, thereby ensuring the tooth rolling quality of the pipe fitting.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the pipe conveying rack is also provided with a plurality of clamping mechanisms, the clamping mechanisms include a clamping seat, a clamping shaft rotatably arranged on the clamping seat, a clamping roller arranged on the clamping shaft and a clamping drive assembly for driving the clamping shaft to rotate. The clamping seat is arranged on the pipe conveying rack, and the two ends of the clamping roller are respectively connected to the clamping shaft through a clamping roller frame. Under the action of the clamping drive assembly, the clamping roller rotates to press or rotate away from the pipe located on the pipe roller assembly.

[0013] The beneficial effect of adopting the above further scheme is that, in order to further ensure the accuracy of the insertion of the push rod and the pipe fitting, before the push rod moves, the pipe fitting can be clamped by the clamping mechanism and the pipe fitting roller assembly to prevent the end of the pipe fitting from tilting and the push rod from being unable to enter the pipe. The clamping mechanism can also act on the pipe fitting during the pipe fitting tooth rolling and rotating discharge process. When clamping the discharge, the pressure regulating valve of the clamping cylinder can be adjusted to obtain a suitable clamping force to meet the clamping requirements of the pipe fitting. The clamping roller and the two rollers of the pipe fitting roller assembly cooperate to restrain the jumping of the discharged pipe fitting.

[0014] Furthermore, the material clamping drive assembly includes a material clamping cylinder and a material clamping rod, the material clamping cylinder is arranged on the material clamping seat, the piston rod of the material clamping cylinder is connected to the material clamping rod, the material clamping rod is provided with a material clamping rack, and the material clamping rotating shaft is provided with a material clamping gear meshing with the material clamping rack.

[0015] The beneficial effect of adopting the above further scheme is that the pipe end of the pipe fitting can be pressed when the push material is aligned, which facilitates the insertion and matching of the push rod and the pipe fitting; during the tooth rolling and discharging process, the tooth rolling pipe fitting can be constrained and clamped to avoid problems such as pipe falling off and loud noise during the tooth rolling process.

[0016] Furthermore, the through-rod conveying mechanism also includes a locking and positioning mechanism, which includes a locking seat, a locking cylinder and a locking plate arranged on the locking seat, the locking seat is arranged on the rod conveying frame, the locking plate is connected to the piston rod of the locking cylinder, the locking plate is provided with a positioning notch for locking the through-rod, and the locking seat is provided with a slide rail for guiding the up and down movement of the locking plate.

[0017] The beneficial effect of adopting the above-mentioned further scheme is that the rear end of the pipe fitting is moved to the rolling station, the through rod is reset, and the butt end of the through rod returns to the rolling station to support the pipe fitting. The clutch cuts off the power transmission between the drive motor and the active wheel, and the gear rolling main machine performs gear rolling on the pipe fitting. The pipe fitting rotates and discharges the material while gear rolling, and the push rod is passively retracted under the push of the pipe fitting. The pipe fitting will vibrate due to the rotation of the pipe fitting during the gear rolling process, and the through rod will apply extrusion pressure to the push rod cylinder. In order to optimize the force of the push rod cylinder, a locking and positioning mechanism is added to the rod conveying frame. After the through rod and the pipe fitting are butt-jointed and reset, and before the pipe fitting is gear rolled, the locking cylinder is actuated, and the positioning notch of the locking plate is stuck on the through rod to lock the through rod, thereby preventing the through rod from applying force to the push rod cylinder, protecting the push rod cylinder, and extending its service life.

[0018] Furthermore, the rod conveying frame is provided with a plurality of clamping mechanisms, and the clamping mechanisms include a clamping frame, a clamping arm, a clamping wheel and a clamping cylinder. The clamping frame and the clamping cylinder are respectively arranged on the rod conveying frame, the middle part of the clamping arm is hinged to the clamping frame, the wheel axle of the clamping wheel is connected to one end of the clamping arm, and the piston rod of the clamping cylinder is connected to the other end of the clamping arm.

[0019] The beneficial effect of adopting the above-mentioned further scheme is that the through rod needs to support the pipe when the pipe is toothed. Although the through rod is supported and positioned by the through rod roller assembly, the rotation of the pipe during the tooth rolling process causes the internal through rod to vibrate. Therefore, a clamping mechanism is added, the piston rod of the clamping cylinder is extended, and the clamping wheel swings downward on the through rod with the clamping arm and the clamping frame hinged position as the fulcrum. The combined action of the through rod roller assembly and the clamping wheel can reduce the vibration of the through rod during the tooth rolling process, reduce noise, and achieve stable support for the pipe during the tooth rolling process of the through rod.

[0020] Furthermore, it also includes a pipe throwing mechanism, which is arranged between the gear rolling main machine and the pipe conveying mechanism; the pipe throwing mechanism includes a throwing frame, a clamping wheel assembly arranged on the throwing frame, a rotating drive mechanism and an opening and closing drive mechanism, the clamping wheel assembly includes a first clamping wheel and a second clamping wheel arranged below the first clamping wheel, a pipe channel is provided between the first clamping wheel and the second clamping wheel, the first clamping wheel is arranged on a first wheel axle, and the second clamping wheel is arranged on a second wheel axle, the first clamping wheel and the second clamping wheel rotate under the action of the rotating drive mechanism to drive the pipe to move axially, and the first clamping wheel and the second clamping wheel clamp or release the pipe under the action of the opening and closing drive mechanism.

[0021] The beneficial effect of adopting the above further scheme is that the rotary drive mechanism is used to drive the rotation of the first clamping wheel and the second clamping wheel respectively, and the rotation direction of the first clamping wheel and the second clamping wheel are opposite to each other. Under the action of the rotary drive mechanism, the static friction between the clamping wheel and the pipe is used to drive the pipe to move axially. When the required throwing distance is met, the rotary drive mechanism stops, and the opening and closing drive mechanism controls the clamping wheel assembly to release the pipe, so that the first clamping wheel and the second clamping wheel are away from the pipe, and the pipe is subjected to the gear rolling processing under the action of the gear rolling main machine. The pipe throwing mechanism can process longer pipes, such as pipes that are twice or even multiple times longer than the required pipe size. The pipe throwing mechanism can throw the pipe to form a smooth section of the pipe. The smooth section on the pipe after gear rolling can be used as a subsequent cutting position, so as to obtain a gear rolling pipe of the required size, further improving the gear rolling efficiency of the pipe.

[0022] Furthermore, the opening and closing drive mechanism includes a first opening and closing member, a second opening and closing member and an opening and closing drive cylinder, the first opening and closing member is arranged above the second opening and closing member, the first opening and closing member is connected to the throwing frame through a first hinge pin, the second opening and closing member is connected to the throwing frame through a second hinge pin, the hinged ends of the first opening and closing member and the second opening and closing member are meshed through a first sector gear and a second sector gear, the connecting end of the first opening and closing member is rotatably connected to the first wheel axle, the connecting end of the second opening and closing member is rotatably connected to the second wheel axle, a driving arm extends from the hinged end of the first opening and closing member or the second opening and closing member, and the piston rod of the opening and closing drive cylinder is hinged to the free end of the driving arm.

[0023] The beneficial effect of adopting the above further scheme is that the driving arm can be on the first opening and closing member or on the second opening and closing member, and can be reasonably selected according to the installation space and layout on the throwing frame. Taking the driving arm on the first opening and closing member as an example, the piston rod of the opening and closing driving cylinder is extended, and the connecting end of the driving arm and the opening and closing driving cylinder swings upward, and the first opening and closing member is driven by the driving arm to rotate with the first hinge pin as the rotation fulcrum, and the connecting end of the first opening and closing member drives the first wheel shaft to swing downward. Since the second sector gear is meshed with the first sector gear, the second opening and closing member synchronously rotates in the opposite direction with the second hinge pin as the rotation fulcrum, and the connecting end of the second opening and closing member drives the second wheel shaft to swing upward, and the first wheel shaft and the first The two wheel axles are closed, so that the first clamping wheel and the second clamping wheel clamp the pipe fitting, and the static friction between the clamping wheel and the pipe fitting is used to drive the pipe fitting to move axially under the action of the rotating drive mechanism. When the throwing distance is met, the rotating drive mechanism stops, the piston rod of the opening and closing drive cylinder retracts, and the connecting end of the swing arm and the opening and closing drive cylinder swings downward. The connecting end of the first opening and closing member drives the first wheel shaft to swing upward. Based on the engagement between the second sector gear and the first sector gear, the second opening and closing member rotates synchronously in the opposite direction, and the connecting end of the second opening and closing member drives the second wheel shaft to swing downward. The first wheel shaft and the second wheel shaft are opened, so that the first clamping wheel and the second clamping wheel are away from the pipe fitting, and the pipe fitting throwing is completed.

[0024] Furthermore, it also includes a clamping adjustment mechanism for adjusting the closing distance between the first clamping wheel and the second clamping wheel, the clamping adjustment mechanism includes a clamping adjustment screw, the clamping adjustment screw is used to limit the maximum swing amplitude of the driving arm when the clamping wheel assembly is clamped, the clamping adjustment screw is threadedly connected to the ejection frame, and the rod end of the clamping adjustment screw passes through the ejection frame to act on the free end of the driving arm.

[0025] The beneficial effect of adopting the above further scheme is that the gear rolling machine can perform gear rolling processing on pipe fittings of different diameters. In order to adapt the spacing between the first clamping wheel and the second clamping wheel when they are closed to different pipe fitting diameters and avoid the problem of insufficient clamping or excessive clamping, a clamping adjustment mechanism is added to adjust the distance between the first clamping wheel and the second clamping wheel when clamping. The closing spacing of the clamping wheels can be adjusted. When the outer diameter of the pipe fitting increases, the spacing of the clamping wheels is increased accordingly to ensure that the clamping wheels will not damage the pipe fitting, so that the throwing mechanism can be applied to more pipe fittings of different specifications. Specifically, the maximum swing amplitude of the outward swing of the driving arm is limited by the clamping adjustment screw to achieve the purpose of controlling the closing spacing. When the diameter of the pipe fitting to be processed increases, the clamping adjustment screw is screwed into the throwing frame, and the driving arm will be limited by the rod end of the adjusting screw when the piston rod of the opening and closing driving cylinder is extended and swung outward, so as to meet the adaptation of the closing spacing between the first opening and closing member and the second opening and closing member to the pipe fitting to be thrown.

[0026] Furthermore, it also includes a feeding mechanism for automatic feeding of pipe fittings, the feeding mechanism includes a material storage rack, a material stop block and multiple material ejecting mechanisms, the bearing surface of the material storage rack is inclined, the material stop block is arranged on the material storage rack, the material ejecting mechanism includes a ejector rod, a ejector shaft and a ejector motor or an ejector rotary cylinder for driving the ejector shaft to rotate, the ejector rod is provided with a ejector rack, and the ejector shaft is provided with a ejector gear meshing with the ejector rack.

[0027] The beneficial effect of adopting the above further scheme is that the pipe fittings can be placed on the pipe fitting roller assembly manually to wait for loading, and of course, the automatic feeding method can also be adopted. The feeding mechanism adopted can not only store materials through the material storage rack, but also has the function of automatic feeding. Considering the length and diameter of the toothed pipe fittings, multiple ejection mechanisms are arranged at intervals, and the meshing of the ejection rack and the ejection gear can ensure the synchronization of each ejection mechanism, so as to realize the automatic feeding of the pipe fittings close to the stop block, that is, the lowest pipe fittings.

[0028] Furthermore, it also includes a feeding mechanism for automatic feeding of pipe fittings, the feeding mechanism includes a feeding drive shaft, a plurality of feeding paddles arranged on the feeding drive shaft, and a feeding drive motor or a feeding rotary cylinder for driving the feeding drive shaft to rotate.

[0029] The beneficial effect of adopting the above further scheme is that after the pipe fittings are processed, they can be unloaded manually. Of course, automatic unloading can also be adopted. The rotation of the unloading drive shaft can drive the unloading paddle to rotate. The unloading paddle rotates with the axis of the unloading drive shaft as the rotation center to lift the pipe fittings after tooth rolling, thereby realizing automatic unloading of the pipe fittings.

[0030] The present invention also relates to a gear rolling method based on the pipe gear rolling machine, and the gear rolling steps are as follows:

[0031] S1. Place the pipe on the pipe roller assembly of the pipe conveying mechanism;

[0032] S2. The piercing rod moves backward, the rod head of the piercing rod moves to the docking position, the clutch engages the power transmission between the push rod drive motor and the driving wheel, the pipe fitting moves forward to the docking position under the action of the push rod, and docks with the piercing rod at the docking position. After the piercing rod and the pipe fitting are docked, the pipe fitting continues to move under the action of the push rod, the piercing rod is reset, and the pipe fitting continues to move until the entire pipe fitting passes through the piercing rod, the movement of the pipe fitting stops, and the clutch cuts off the power transmission between the push rod drive motor and the driving wheel;

[0033] S3. The tooth rolling main machine starts to roll the teeth of the pipe fittings. The pipe fittings are discharged while rolling the teeth. The rear end of the pipe fittings remains in the state of being plugged into the push rod. The push rod is reset under the push of the pipe fittings until the tooth rolling of the pipe fittings is completed.

[0034] Compared with the prior art, the present invention has the following beneficial effects: the mandrel conveying mechanism is arranged on the front side of the gear rolling main machine, the pipe conveying mechanism is arranged on the rear side of the gear rolling main machine, the pipe and the mandrel move automatically respectively, and are accurately docked at the docking position, the pipe continues to move forward after docking, the mandrel is reset and supported in the pipe, the rear end of the pipe moves to the rolling station and stops moving, the clutch cuts off the power transmission, the pipe is rolled and discharged under the action of the gear rolling main machine, the push rod maintains the plug-in state with the pipe end of the pipe, and is passively retracted under the action of the pipe, which reduces the jumping of the pipe when rolling and discharging, reduces noise, reduces or even avoids the throwing out of the cutting fluid in the pipe, and improves the rolling efficiency and quality of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of embodiment 1 of the pipe gear rolling machine of the present invention;

[0036] Figure 2 It is a structural schematic diagram of the pipe conveying mechanism of the present invention;

[0037] Figure 3 for Figure 2 A partial enlarged view of the middle push material assembly;

[0038] Figure 4 It is a structural schematic diagram of the longitudinal section of the driving wheel of the present invention;

[0039] Figure 5 It is a structural schematic diagram of the push rod of the present invention;

[0040] Figure 6 It is a schematic structural diagram of the head portion of the putter of the present invention;

[0041] Figure 7 It is a structural schematic diagram of a pipe conveying mechanism with a material clamping mechanism of the present invention;

[0042] Figure 8 It is a structural schematic diagram of the clamping mechanism of the present invention;

[0043] Fig. 9 It is a schematic diagram of the cross-sectional structure of the clamping mechanism of the present invention along the axial direction of the clamping rod;

[0044] Fig.10 It is a structural schematic diagram of the core-penetrating rod conveying mechanism of the present invention;

[0045] Fig.11 It is a structural schematic diagram of the locking and positioning mechanism of the present invention;

[0046] Fig.12 It is a structural schematic diagram of Embodiment 2 of the pipe gear rolling machine of the present invention;

[0047] Fig.13It is a structural schematic diagram of the pipe conveying mechanism of the embodiment 2 of the pipe gear rolling machine of the present invention;

[0048] Fig.14 for Fig.13 A partial enlarged view of the gear rolling main machine;

[0049] Fig.15 for Fig.13 A right view structural diagram of ;

[0050] Fig.16 It is a structural schematic diagram of the feeding mechanism of the present invention;

[0051] Fig.17 It is a schematic diagram of the cross-sectional structure of the present invention along the axial direction of the push rod;

[0052] Fig.18 It is a structural schematic diagram of the material blocking mechanism and the material unloading mechanism of the present invention;

[0053] Fig.19 It is a schematic diagram of the cross-sectional structure of the present invention along the axial direction of the material blocking rod;

[0054] Fig. 20 It is a structural schematic diagram of the pipe throwing mechanism of the present invention;

[0055] Fig.21 It is a schematic diagram of the internal structure of the pipe throwing mechanism of the present invention;

[0056] Fig. 22 It is a schematic structural diagram of the first opening and closing member and the second opening and closing member of the pipe throwing mechanism of the present invention in the coordinated state;

[0057] Fig.23 It is a schematic structural diagram of the matching state of the first transmission gear, the second transmission gear, the third transmission gear and the fourth transmission gear of the pipe throwing mechanism of the present invention;

[0058] In the figure, 1, gear rolling main machine; 2, pipe conveying mechanism; 201, pipe conveying frame; 202, push rod; 203, follower pipe head; 204, driving wheel; 205, push rod driving motor; 206, driven wheel; 207, synchronous belt; 208, pipe roller assembly; 209, clutch; 2091, clutch coil; 2092, clutch fixing part; 2093, clutch rotating part; 210, guide rail; 211, clamping seat; 212, clamping shaft; 213, clamping roller frame; 214, clamping roller; 215, clamping cylinder; 216, clamping rod; 217, clamping gear; 218, clamping rack; 219, encoder; 220, proximity switch; 3, feeding mechanism; 301, storage rack; 302, blocking block; 303, ejector; 304, ejector shaft; 305, ejector transmission shaft; 306, ejector rotary cylinder; 307, ejector rack; 308, ejector gear; 4, unloading mechanism; 401, unloading plate; 402, unloading transmission shaft; 403, unloading rotary cylinder; 5, blocking mechanism; 50 1. Material blocking rod; 502. Material blocking shaft; 503. Material blocking transmission shaft; 504. Material blocking rotary cylinder; 505. Material blocking rack; 506. Material blocking gear; 6. Pipe throwing mechanism; 601. Throwing frame; 602. First clamping wheel; 603. Second clamping wheel; 604. First opening and closing member; 605. First sector gear; 606. Driving arm; 607. Second opening and closing member; 608. Second sector gear; 609. Opening and closing driving cylinder; 610. Clamping adjustment screw; 611. Locking block; 612. Locating pin; 613, locking rod; 614, first transmission gear; 615, second transmission gear; 616, third transmission gear; 617, fourth transmission gear; 618, rotary drive motor; 7, through-rod conveying mechanism; 701, rod conveying frame; 702, push rod cylinder; 703, through-rod; 704, locking cylinder; 705, locking seat; 706, locking plate; 707, through-rod roller assembly; 708, clamping frame; 709, clamping arm; 710, clamping wheel; 711, clamping cylinder. DETAILED DESCRIPTION

[0059] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0060] Embodiment 1, as Figure 1-Figure 11 As shown, a pipe gear rolling machine comprises a gear rolling main machine 1, a pipe conveying mechanism 2 and a mandrel conveying mechanism 7, wherein the pipe conveying mechanism 2 is arranged on one side of the gear rolling main machine 1, and the mandrel conveying mechanism 7 is arranged on the other side of the gear rolling main machine 1;

[0061] The pipe conveying mechanism 2 includes a pipe conveying frame 201, a pushing assembly arranged on the pipe conveying frame 201, and a plurality of pipe roller assemblies 208 arranged along the length direction of the pipe conveying frame 201, the pushing assembly includes a push rod 202 and a push rod driving mechanism, a follower pipe head 203 is rotatably arranged at the free end of the push rod 202, and a ring platform for positioning the pipe end of the pipe is provided on the follower pipe head 203, the push rod driving mechanism includes a driving wheel 204, a driven wheel 206, a synchronous belt 207 wrapped around the driving wheel 204 and the driven wheel 206, and a push rod driving motor 205, the push rod driving motor 205 is connected to the driving wheel 204 through a clutch 209, the clutch 209 engages the power transmission between the push rod driving motor 205 and the driving wheel 204 when the pipe is loaded, and the clutch 209 cuts off the power transmission between the push rod driving motor 205 and the driving wheel 204 when the pipe is discharged, and the push rod 202 is connected to the synchronous belt 207 through the rod frame; Figure 2 The dotted line portion in the figure shows the state where the push rod 202 moves to the end of the tube conveying frame 201 close to the gear rolling main machine 1;

[0062] The piercing rod conveying mechanism 7 includes a rod conveying frame 701, a piercing rod 703 arranged on the rod conveying frame 701, a pushing rod cylinder 702 for pushing the piercing rod 703, and a plurality of piercing rod roller assemblies 707 arranged along the length direction of the rod conveying frame 701. The piercing rod 703 can be inserted into the pipe fitting for supporting the pipe fitting. The piston rod of the pushing rod cylinder 702 is connected to the piercing rod 703. The free end of the piercing rod 703 and the free end of the push rod 202 are pointed structures.

[0063] The pipe conveying frame 201 is also provided with a guide rail 210 for guiding the push rod 202. The pipe fittings are loaded under the action of the push rod 202, and the push rod 202 is passively returned under the push of the pipe fittings when the pipe fittings are discharged. The cooperation between the guide rail 210 and the rod frame slider at the bottom of the push rod 202 can limit and guide the push rod 202 for active pushing or passive resetting.

[0064] The free end of the push rod 202 is threadedly connected with a rod head. Figure 6 As shown, the follower pipe head 203 is arranged on the rod head through a bearing.

[0065] The tube conveying frame 201 has a plurality of material clamping mechanisms, such as Figure 7-9 As shown, the material clamping mechanism includes a material clamping seat 211 disposed on the pipe conveying frame 201, a material clamping shaft 212 rotatably disposed on the material clamping seat 211, a material clamping roller 214 disposed on the material clamping shaft 212, and a material clamping driving assembly for driving the material clamping shaft 212 to rotate. Both ends of the material clamping roller 214 are connected to the material clamping shaft 212 through a clamping roller frame 213. Under the action of the material clamping driving assembly, the material clamping roller 214 rotates to press or rotate away from the pipe located on the pipe supporting roller assembly 208. Figure 8 and Fig. 9 The dotted line portion in the figure shows the state where the clamping roller 214 rotates to press the pipe fitting.

[0066] The clamping drive assembly includes a clamping cylinder 215 and a clamping rod 216. The clamping cylinder 215 is arranged on the clamping seat 211. The piston rod of the clamping cylinder 215 is connected to the clamping rod 216. The clamping rod 216 is provided with a clamping rack 218. The clamping shaft 212 is provided with a clamping gear 217 meshing with the clamping rack 218. When pushing the material, the pipe end of the pipe fitting can be pressed and fixed, which is convenient for the push rod 202 to be inserted and matched with the pipe fitting; during the process of rolling the material, the rolled pipe fitting can be constrained and clamped to avoid problems such as pipe throwing and loud noise during the rolling process.

[0067] The clutch 209 may be an electromagnetic clutch, and the clutch 209 is disposed between the driving wheel 204 and the push rod driving motor 205. The clutch 209 includes a clutch coil 2091, a clutch fixing portion 2092, and a clutch rotating portion 2093. Figure 4 As shown, the clutch fixing part 2092 is connected to the main shaft through a sliding key; the driving wheel 204 and the clutch rotating part 2093 are rotatably arranged on the main shaft, the clutch rotating part 2093 is connected to the driving wheel 204, and the main shaft rotates under the action of the push rod driving motor 205. The clutch fixing part 2092 rotates with the main shaft, and there is a 1mm gap between the clutch fixing part 2092 and the clutch rotating part 2093. The clutch coil 2091 is turned on and off to realize the engagement and disengagement between the clutch fixing part 2092 and the clutch rotating part 2093. The main shaft is the output shaft of the push rod driving motor 205; it can also be an independent main shaft, and the main shaft can be connected to the output shaft of the push rod driving motor 205.

[0068] The driving wheel 204 may also be provided with an encoder 219. The encoder 219 may be an absolute encoder, and the detection shaft of the encoder 219 is connected to the driving wheel 204 through the detection transmission shaft. The push rod 202 is pushed in the opposite direction by the rolling teeth of the pipe fitting, and the push rod 202 drives the synchronous belt 207 to rotate through the rod frame, thereby driving the driving wheel 204 to rotate, and the encoder 219 rotates accordingly. The moving distance of the push rod 202 can be reflected in the number of rotations of the encoder 219, and the length of the rolled teeth pipe fitting is detected by the encoder 219. The encoder 219 can be used in conjunction with the proximity switch 220, which is also called the zeroing switch. The proximity switch 220 is a stop switch for the push rod driving motor 205 to drive the push rod 202 to push the pipe fitting to the position. The so-called position means that the pipe fitting reaches the rolling teeth position. At this time, the rod frame triggers the proximity switch 220, and the encoder 219 returns to zero, thereby ensuring the accuracy of the length of the rolled pipe detected by the encoder 219. During the tooth rolling process, the push rod 202 will move along with the tooth rolling pipe, and the tooth rolling rate is equal to the moving speed of the push rod 202, so that the real-time production efficiency can be directly fed back.

[0069] The core-penetrating rod conveying mechanism 7 also includes a locking and positioning mechanism, such as Fig.11 As shown, the locking and positioning mechanism includes a locking seat 705, a locking cylinder 704 and a locking plate 706 arranged on the locking seat 705. The locking seat 705 is arranged on the rod conveying frame 701. The locking plate 706 is connected to the piston rod of the locking cylinder 704. The locking plate 706 is provided with a positioning notch for locking the through-core rod 703. The locking seat 705 is provided with a slide rail for guiding the up and down movement of the locking plate 706. The through-core rod 703 is hollow inside, and the through-core rod 703 is provided with a rod cutting fluid inlet and a rod cutting fluid outlet. The cutting fluid enters the interior of the pipe fitting through the through-core rod 703 to cool and lubricate the pipe fitting being processed.

[0070] The rod conveying frame 701 is provided with a plurality of clamping mechanisms, such as Fig.10 As shown, the clamping mechanism includes a clamping frame 708, a clamping arm 709, a clamping wheel 710 and a clamping cylinder 711. The clamping frame 708 and the clamping cylinder 711 are respectively arranged on the rod conveying frame 701. The middle part of the clamping arm 709 is hinged to the clamping frame 708, the wheel axle of the clamping wheel 710 is connected to one end of the clamping arm 709, and the piston rod of the clamping cylinder 711 is connected to the other end of the clamping arm 709.

[0071] Embodiment 2, as Figure 12-Figure 23 As shown, Fig.12 The part of the core rod conveying mechanism 7 is omitted. Based on the embodiment 1, the pipe gear rolling machine further comprises a pipe throwing mechanism 6, and the pipe throwing mechanism 6 is arranged between the gear rolling main machine 1 and the pipe conveying mechanism 2; Figure 20-23 As shown, the pipe throwing mechanism 6 includes a throwing frame 601, a clamping wheel assembly, a rotating drive mechanism and an opening and closing drive mechanism. The clamping wheel assembly includes a first clamping wheel 602 and a second clamping wheel 603. A pipe channel is provided between the first clamping wheel 602 and the second clamping wheel 603. The first clamping wheel 602 is arranged on a first wheel axle, and the second clamping wheel 603 is arranged on a second wheel axle. The first clamping wheel 602 and the second clamping wheel 603 rotate under the action of the rotating drive mechanism to drive the pipe to move axially. The first clamping wheel 602 and the second clamping wheel 603 can clamp or release the pipe under the action of the opening and closing drive mechanism.

[0072] The opening and closing driving mechanism includes a first opening and closing member 604, a second opening and closing member 607 and an opening and closing driving cylinder 609. The first opening and closing member 604 is arranged above the second opening and closing member 607. The first opening and closing member 604 is connected to the throwing frame 601 through a first hinge pin, and the second opening and closing member 607 is connected to the throwing frame 601 through a second hinge pin. The hinged ends of the first opening and closing member 604 and the second opening and closing member 607 are meshed through a first sector gear 605 and a second sector gear 608. The connecting end of the first opening and closing member 604 is rotatably connected to the first wheel shaft, and the connecting end of the second opening and closing member 607 is rotatably connected to the second wheel shaft. A driving arm 606 extends from the hinged end of the first opening and closing member 604 or the second opening and closing member 607, and the piston rod of the opening and closing driving cylinder 609 is hinged to the free end of the driving arm 606. The smooth section of the thrown pipe is used as the subsequent cutting position, so as to obtain the toothed pipe of the required size, and further improve the toothing efficiency of the pipe.

[0073] It also includes a clamping adjustment mechanism for adjusting the closing distance between the first clamping wheel 602 and the second clamping wheel 603, the clamping adjustment mechanism includes a clamping adjustment screw 610, the clamping adjustment screw 610 is used to limit the maximum swing amplitude of the driving arm 606 when the clamping wheel assembly is clamped, the clamping adjustment screw 610 is threadedly connected to the ejection frame 601, and the rod end of the clamping adjustment screw 610 passes through the ejection frame 601 to act on the free end of the driving arm 606.

[0074] It also includes a quick locking mechanism for locking the clamping adjustment screw 610, the quick locking mechanism includes a locking block 611 and a locking rod 613, the clamping adjustment screw 610 is threadedly connected to the locking block 611, a positioning hole is provided on the throwing frame 601, one end of the locking block 611 is provided with a positioning pin 612 adapted to the positioning hole, the locking rod 613 is threadedly connected to the other end of the locking block 611, and the rod end of the locking rod 613 passes through the locking block 611 and presses against the throwing frame 601. When the pipe needs to be thrown in a smooth section, the drive arm 606 swings outward to hit the clamping adjustment screw 610. Although the clamping adjustment screw 610 is threadedly connected to the throwing frame 601, there may be a problem of movement of the clamping adjustment screw 610. Once the clamping adjustment screw 610 moves, the gap between the first clamping wheel 602 and the second clamping wheel 603 is reduced, and there is a problem of excessive clamping of the pipe. Therefore, a quick locking mechanism is provided to stabilize the position of the clamping adjustment screw 610 after positioning and adjusting, so as to avoid axial movement of the clamping adjustment screw 610. The locking block 6 One end of 11 cooperates with the positioning hole on the throwing frame 601 through the positioning pin 612, and the rod end of the locking rod 613 at the other end is pressed against the throwing frame 601, and the locking rod 613 can be rotated to adjust the protruding length of the locking rod 613 so that the surface of the locking block 611 threadedly connected with the clamping adjustment screw 610 is inclined, and the clamping adjustment screw 610 is quickly locked by the inclined locking block 611. Even if the driving arm 606 hits the rod end of the clamping adjustment screw 610 again, the clamping adjustment screw 610 will not move, thereby meeting the effect of the clamping wheel assembly clamping the pipe with appropriate force.

[0075] The rotary drive mechanism includes a first transmission gear 614, a second transmission gear 615, a third transmission gear 616, a fourth transmission gear 617 and a rotary power component. The first transmission gear 614 is arranged on the first wheel axle, the second transmission gear 615 is arranged on the second wheel axle, the third transmission gear 616 is rotatably arranged on the first hinge pin, and the fourth transmission gear 617 is rotatably arranged on the second hinge pin. The first transmission gear 614 is meshed with the third transmission gear 616, the second transmission gear 615 is meshed with the fourth transmission gear 617, and the third transmission gear 616 is meshed with the fourth transmission gear 617. The wheel axle of the third transmission gear 616 or the fourth transmission gear 617 is connected to the output end of the rotary power component.

[0076] The rotating power component includes a rotating drive motor 618. The axial movement of the pipe is driven by the static friction between the clamping wheel and the pipe. The first clamping wheel 602 and the second clamping wheel 603 rotate in opposite directions, such as the first clamping wheel 602 rotates counterclockwise and the second clamping wheel 603 rotates clockwise. The output end of the rotating drive motor 618 can be connected to the third transmission gear 616 or the fourth transmission gear 617. For example, the rotating drive motor 618 transmits power to the fourth transmission gear 617, and the fourth transmission gear 617 transmits power to the second transmission gear 615. At the same time, the fourth transmission gear 617 transmits power to the first transmission gear 614 through the third transmission gear 616. The first transmission gear 614 and the second transmission gear 615 rotate in opposite directions to realize the transportation of the pipe. When the wheel shaft in the opening and closing drive mechanism swings, it will not affect the meshing transmission between the transmission gears.

[0077] The pipe gear rolling machine also includes a feeding mechanism 3 for automatically feeding pipes. Fig.16 and Fig.17 As shown, the feeding mechanism 3 includes a material storage rack 301, a material stopper 302 and a plurality of material ejection mechanisms. The material storage rack 301 has an inclined bearing surface, and the material stopper 302 is arranged on the material storage rack 301. The material ejection mechanism includes a ejector rod 303, an ejector shaft 304 and an ejector motor or an ejector rotary cylinder 306 for driving the ejector shaft 304 to rotate. The ejector rod 303 is provided with an ejector rack 307, and the ejector shaft 304 is provided with an ejector gear 308 meshing with the ejector rack 307. Adjacent ejector shafts 304 are connected by an ejector transmission shaft 305. The feeding mechanism 3 is arranged on the feeding side of the pipe conveying mechanism 2 to realize automatic feeding of pipes of the pipe conveying mechanism 2. The pipes to be processed by gear rolling can be pre-stored on the material storage rack 301.

[0078] The pipe gear rolling machine also includes a feeding mechanism 4 for automatically feeding the pipe. Fig.18 As shown, the unloading mechanism 4 includes an unloading transmission shaft 402, a plurality of unloading paddles 401 arranged on the unloading transmission shaft 402, and an unloading driving motor or an unloading rotary cylinder 403 for driving the unloading transmission shaft 402 to rotate. The unloading mechanism 4 is arranged on the unloading side of the pipe conveying mechanism 2 to realize automatic unloading of pipes of the pipe conveying mechanism 2.

[0079] The pipe gear rolling machine also includes a material blocking mechanism 5, such as Fig.19As shown, the blocking mechanism 5 and the unloading mechanism 4 are arranged on the same side, and the blocking mechanism 5 includes a blocking rod 501 and a blocking shaft 502. The blocking rod 501 is axially arranged on the blocking housing, and the blocking shaft 502 is rotatably arranged on the blocking housing, and the blocking housing is arranged on the pipe conveying frame 201. The blocking rod 501 is provided with a blocking rack 505, and the blocking shaft 502 is provided with a blocking gear 506 meshing with the blocking rack 505. Adjacent blocking shafts 502 are connected by a blocking transmission shaft 503, and the blocking shaft 502 and the blocking transmission shaft 503 rotate under the action of the blocking power mechanism. The unloading paddle 401 is provided with an avoidance slot for avoiding the blocking rod 501. Since the processed products are pipe fittings, the pipe fitting roller assembly 208 is used for material connection. In order to ensure that the pipe fittings fall smoothly on the pipe fitting roller assembly 208, a material blocking mechanism 5 is set. In order to meet the length requirements of the pipe fittings, multiple material blocking mechanisms 5 can be arranged along the length direction of the pipe conveying rack 201. The material blocking rack 505 cooperates with the material blocking gear 506 to ensure the synchronization of the lifting and lowering of each material blocking mechanism 5. The material blocking mechanisms 5 are connected by the material blocking transmission shaft 503, and only one power drive is required, which not only saves costs and facilitates subsequent maintenance, but also minimizes the limited space occupied on the pipe conveying rack 201. Before the pipe fittings are automatically fed, the material blocking rod 501 is first raised, and after the pipe fittings are in place, the material blocking rod 501 is reset. The material blocking power mechanism adopts a material blocking motor or a material blocking rotary cylinder 504, and the output shaft of the material blocking motor or the material blocking rotary cylinder 504 is connected to the material blocking shaft 502 or the material blocking transmission shaft 503.

[0080] The present invention also relates to a gear rolling method based on the pipe gear rolling machine, and the gear rolling steps are as follows:

[0081] S1. Place the pipe on the pipe roller assembly 208 of the pipe conveying mechanism 2.

[0082] S2. The piercing rod 703 moves backward, the rod head of the piercing rod 703 moves to the docking position, the clutch 209 engages the power transmission between the push rod drive motor 205 and the driving wheel 204, the pipe fitting moves forward to the docking position under the action of the push rod 202, and docks with the piercing rod 703 at the docking position. After the piercing rod 703 docks with the pipe fitting, the pipe fitting continues to move under the action of the push rod 202, the front end of the pipe fitting moves to or over the rolling station, the piercing rod 703 is reset, and the pipe fitting continues to move until the entire pipe fitting passes through the piercing rod 703, the rear end of the pipe fitting moves to the rolling station, the movement of the pipe fitting stops, and the clutch 209 disconnects the power transmission between the push rod drive motor 205 and the driving wheel 204;

[0083] S3. The tooth rolling main machine starts to perform tooth rolling on the pipe fittings. The pipe fittings are discharged while being tooth rolled. The rear end of the pipe fittings is kept plugged with the push rod 202. The push rod 202 is reset under the push of the pipe fittings until the tooth rolling of the pipe fittings is completed.

[0084] In the above step S1, the pipe fittings can be automatically fed by the feeding mechanism 3. Before the pipe fittings are automatically fed in the above step S1, the blocking mechanism 5 is actuated to block the pipe fittings by the blocking rod 501, so that the automatically fed pipe fittings can fall onto the pipe fitting roller assembly 208. After the above step S3, the pipe fittings after tooth rolling can be automatically unloaded by the unloading mechanism 4.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pipe gear rolling machine, comprising a gear rolling main machine (1), characterized in that: It also includes a pipe conveying mechanism (2) and a mandrel conveying mechanism (7), wherein the pipe conveying mechanism (2) is arranged on one side of the gear rolling main machine (1), and the mandrel conveying mechanism (7) is arranged on the other side of the gear rolling main machine (1); the pipe conveying mechanism (2) includes a pipe conveying frame (201), a pushing assembly arranged on the pipe conveying frame (201), and a plurality of pipe roller assemblies (208) arranged along the length direction of the pipe conveying frame (201); the pushing assembly includes a push rod (202) and a push rod driving mechanism; a follower pipe head (203) is rotatably arranged on the push rod (202), and a ring platform for positioning the pipe is provided on the follower pipe head (203); The push rod driving mechanism comprises a driving wheel (204), a driven wheel (206), a synchronous belt (207) wrapped around the driving wheel (204) and the driven wheel (206), and a push rod driving motor (205); the push rod driving motor (205) is connected to the driving wheel (204) via a clutch (209); the clutch (209) engages the power transmission between the push rod driving motor (205) and the driving wheel (204) when the pipe is loaded; the clutch (209) cuts off the power transmission between the push rod driving motor (205) and the driving wheel (204) when the pipe is unloaded; the push rod (202) is connected to the synchronous belt (207); The through-rod conveying mechanism (7) comprises a rod conveying frame (701), a through-rod (703) arranged on the rod conveying frame (701), a push rod cylinder (702) for pushing the through-rod (703) to move, and a plurality of through-rod roller assemblies (707) arranged along the length direction of the rod conveying frame (701); the through-rod (703) is inserted into a pipe fitting for supporting the pipe fitting; the free end of the through-rod (703) and the free end of the push rod (202) are both pointed structures.

2. The pipe gear rolling machine according to claim 1, characterized in that: The tube conveying frame (201) is also provided with a plurality of material clamping mechanisms, the material clamping mechanisms comprising a material clamping seat (211), a material clamping shaft (212) rotatably arranged on the material clamping seat (211), a material clamping roller (214) arranged on the material clamping shaft (212), and a material clamping drive assembly for driving the material clamping shaft (212) to rotate. The material clamping seat (211) is arranged on the tube conveying frame (201), and both ends of the material clamping roller (214) are respectively connected to the material clamping shaft (212) via a clamping roller frame (213). Under the action of the material clamping drive assembly, the material clamping roller (214) rotates to press or rotates away from the tube located on the tube roller assembly (208).

3. The pipe gear rolling machine according to claim 2, characterized in that: The material clamping drive assembly comprises a material clamping cylinder (215) and a material clamping rod (216); the material clamping cylinder (215) is arranged on the material clamping seat (211); the piston rod of the material clamping cylinder (215) is connected to the material clamping rod (216); a material clamping rack (218) is provided on the material clamping rod (216); and a material clamping gear (217) meshing with the material clamping rack (218) is provided on the material clamping rotating shaft (212).

4. The pipe gear rolling machine according to claim 1, characterized in that: The through-rod conveying mechanism (7) further comprises a locking and positioning mechanism, the locking and positioning mechanism comprising a locking seat (705), a locking cylinder (704) and a locking plate (706) arranged on the locking seat (705); the locking seat (705) is arranged on the rod conveying frame (701); the locking plate (706) is connected to the piston rod of the locking cylinder (704); a positioning notch for locking the through-rod (703) is provided on the locking plate (706); and a slide rail for guiding the upward and downward movement of the locking plate (706) is provided on the locking seat (705).

5. The pipe gear rolling machine according to claim 1, characterized in that: The rod conveying frame (701) is provided with a plurality of clamping mechanisms, the clamping mechanisms comprising a clamping frame (708), a clamping arm (709), a clamping wheel (710) and a clamping cylinder (711); the clamping frame (708) and the clamping cylinder (711) are respectively arranged on the rod conveying frame (701); the middle part of the clamping arm (709) is hinged to the clamping frame (708); the wheel axle of the clamping wheel (710) is connected to one end of the clamping arm (709); and the piston rod of the clamping cylinder (711) is connected to the other end of the clamping arm (709).

6. The pipe gear rolling machine according to claim 1, characterized in that: The invention also comprises a pipe throwing mechanism (6), wherein the pipe throwing mechanism (6) is arranged between the gear rolling main machine (1) and the pipe conveying mechanism (2); the pipe throwing mechanism (6) comprises a throwing frame (601), a clamping wheel assembly arranged on the throwing frame (601), a rotation drive mechanism and an opening and closing drive mechanism; the clamping wheel assembly comprises a first clamping wheel (602) and a second clamping wheel (603) arranged below the first clamping wheel (602); a pipe passage is arranged between the first clamping wheel (602) and the second clamping wheel (603); the first clamping wheel (602) is arranged on a first wheel shaft, and the second clamping wheel (603) is arranged on a second wheel shaft; the first clamping wheel (602) and the second clamping wheel (603) rotate to drive the pipe to move axially under the action of the rotation drive mechanism; the first clamping wheel (602) and the second clamping wheel (603) clamp or release the pipe under the action of the opening and closing drive mechanism.

7. The pipe gear rolling machine according to claim 6, characterized in that: The opening and closing drive mechanism comprises a first opening and closing member (604), a second opening and closing member (607) and an opening and closing drive cylinder (609); the first opening and closing member (604) is arranged above the second opening and closing member (607); the first opening and closing member (604) is connected to the throwing frame (601) via a first hinge pin; the second opening and closing member (607) is connected to the throwing frame (601) via a second hinge pin; the first opening and closing member (604) and the second opening and closing member (607) are connected to each other via a first hinge pin. The hinged ends of the first opening and closing member (604) are meshed with each other through a first sector gear (605) and a second sector gear (608); the connecting end of the first opening and closing member (604) is rotatably connected to the first wheel axle; the connecting end of the second opening and closing member (607) is rotatably connected to the second wheel axle; a driving arm (606) extends from the hinged end of the first opening and closing member (604) or the second opening and closing member (607); and the piston rod of the opening and closing driving cylinder (609) is hingedly connected to the free end of the driving arm (606).

8. The pipe gear rolling machine according to claim 7, characterized in that: It also includes a clamping adjustment mechanism for adjusting the closing distance between the first clamping wheel (602) and the second clamping wheel (603), the clamping adjustment mechanism including a clamping adjustment screw (610), the clamping adjustment screw (610) being used to limit the maximum swing amplitude of the driving arm (606) when the clamping wheel assembly is clamped, the clamping adjustment screw (610) being threadedly connected to the ejection frame (601), the rod end of the clamping adjustment screw (610) passing through the ejection frame (601) to act on the free end of the driving arm (606).

9. The pipe gear rolling machine according to claim 1, characterized in that: It also includes a feeding mechanism (3) for automatically feeding pipes and / or a unloading mechanism (4) for automatically unloading pipes; The feeding mechanism (3) comprises a material storage rack (301), a material stopper block (302) and a plurality of material ejection mechanisms; the bearing surface of the material storage rack (301) is arranged at an inclination; the material stopper block (302) is arranged on the material storage rack (301); the material ejection mechanism comprises a ejector rod (303), an ejector shaft (304) and an ejector motor or an ejector rotary cylinder (306) for driving the ejector shaft (304) to rotate; the ejector rod (303) is provided with an ejector rack (307); and the ejector shaft (304) is provided with an ejector gear (308) meshing with the ejector rack (307); The material unloading mechanism (4) comprises a material unloading transmission shaft (402), a plurality of material unloading paddles (401) arranged on the material unloading transmission shaft (402), and a material unloading drive motor or a material unloading rotary cylinder (403) for driving the material unloading transmission shaft (402) to rotate.

10. A gear rolling method for a pipe gear rolling machine according to any one of claims 1 to 9, characterized in that: The gear rolling steps are as follows: S1. placing the pipe on the pipe roller assembly (208) of the pipe conveying mechanism (2); S2. The piercing rod (703) moves backward, the rod head of the piercing rod (703) moves to the docking position, the clutch (209) engages the power transmission between the push rod drive motor (205) and the driving wheel (204), the pipe fitting moves forward to the docking position under the action of the push rod (202), and docks with the piercing rod (703) at the docking position. After the piercing rod (703) and the pipe fitting are docked, the pipe fitting continues to move under the action of the push rod (202), the piercing rod (703) is reset, and the pipe fitting continues to move until the entire pipe fitting passes through the piercing rod (703), the movement of the pipe fitting stops, and the clutch (209) cuts off the power transmission between the push rod drive motor (205) and the driving wheel (204); S3. The tooth rolling main machine (1) is actuated to perform tooth rolling on the pipe fitting. The pipe fitting is discharged while being tooth rolled. The rear end of the pipe fitting remains plugged into the push rod (202). The push rod (202) is reset under the push of the pipe fitting until the tooth rolling of the pipe fitting is completed.

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