Full-automatic small U-shaped pipe bending and ring mounting all-in-one machine

Abstract

The utility model discloses a full-automatic small U pipe bending and ring mounting all-in-one machine which comprises a machine table, a feeding device and a pipe bending device, the feeding device and the pipe bending device are arranged on the machine table, the feeding device supplies pipe fittings to the pipe bending device, and the full-automatic small U pipe bending and ring mounting all-in-one machine is characterized in that a conveying device, a circulating feeding mechanism and a ring sleeving device are further arranged on the machine table; a clamp unit is arranged on a rotary disc of the circulating feeding mechanism, a pipe fitting is bent into a U-shaped pipe through the pipe bending device, then the U-shaped pipe is conveyed into the clamp unit through the conveying device to be clamped and fixed, the fixed U-shaped pipe is conveyed to the working position of the ring sleeving device through rotation of the rotary disc, and the ring sleeving device can sleeve a metal welding ring on a pipe pin of the U-shaped pipe. The equipment is high in automation degree, and the production efficiency of enterprises is improved.

Description

Technical Field

[0001] The utility model relates to a pipe processing device for air conditioners, in particular to a full-automatic small U-tube bending and ringing integrated machine. Background Art

[0002] Air conditioners require a U-shaped tube, which was previously accomplished directly using a tube bending machine. The tube bending machine includes a feeding device and a tube bending device. The feeding device supplies the tube to the tube bending device, which bends the tube into a U-shaped tube. However, it is subsequently necessary to put a metal welding ring on the tube pin of the U-shaped tube that has been bent into a U shape, and previous tube bending machines did not have the ring-putting function.

[0003] Therefore, the present application combines the previous pipe bending machine to design a fully automatic small U-tube bending and ringing integrated machine, which integrates the bent pipe and the ring into one, which is convenient for users and improves efficiency. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a fully automatic small U-tube bending and ring-fitting integrated machine.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] The fully automatic small U-tube bending and ringing integrated machine comprises a machine platform and a feeding device and a pipe bending device arranged on the machine platform. The feeding device supplies the pipe fittings to the pipe bending device. The machine platform is also provided with a conveying device, a circulating feeding mechanism, and a ring device. The turntable of the circulating feeding mechanism is provided with a clamp unit. After the pipe bending device bends the pipe fitting into a U-shaped pipe, it is conveyed to the clamp unit for clamping and fixing through the conveying device. After being fixed, the U-shaped pipe is rotated by the turntable to send it to the working position of the ring device. The ring device can put a metal welding ring on the tube pin of the U-shaped pipe.

[0007] The conveying device includes a feeding funnel, a feeding trough, a discharging hopper, a vibration plate assembly and a pushing assembly. The feeding trough is provided with a feeding motor and a belt transmission unit. The conveyor belt of the belt transmission unit is located in the feeding trough. The output end of the feeding funnel is located above the feeding trough. A guide groove is provided at the end of the feeding trough. The outlet of the guide groove is located above the vibration plate assembly. The vibration plate assembly can convey the U-shaped tube to the pushing assembly and send the U-shaped tube to the clamp unit for clamping through the pushing assembly.

[0008] The pushing assembly includes a pushing drive unit, a pushing rod, a pushing seat, and a guide groove and a pushing hole arranged on the pushing seat. The pushing hole is connected to the guide groove, and the pushing rod is located in the pushing hole and connected to the pushing drive unit.

[0009] The clamping unit includes a clamping drive unit, a lifting and pushing block connected to the clamping drive unit, a lower clamping seat, a movable seat and a clamping groove located between the lower clamping seat and the movable seat, the movable seat is relatively provided with a sliding hole one, the sliding rod is located in the sliding hole one, and the end of the sliding rod is fixed to the turntable, one end of the connecting rod is fixed to the movable seat and the connecting rod is slidably matched with the sliding hole two on the turntable, an end plate fixed to the connecting rod is provided under the turntable, a clamping spring is provided on the sliding rod, one end of the clamping spring is abutted against the end cap of the sliding rod, and the other end of the clamping spring is abutted against the movable seat, and the lifting and pushing block can lift the end plate under the drive of the clamping drive unit.

[0010] The collar device includes a vibrating feed plate, a guide plate, a collar seat, a collar drive unit and a collar assembly arranged on the collar seat, wherein the guide plate is provided with a guide hole and a collar hole communicating with the guide hole, the hole wall of the collar hole is not provided with a positioning groove, and the collar assembly is driven by the collar drive unit to pass through the collar hole to drive the collar and be sleeved on the U-shaped tube.

[0011] The collar assembly includes an inner rod and an outer tube, the inner rod is located in the outer tube and slidably cooperates with the outer tube, the outer tube is provided with a reset spring for resetting the inner rod, the end of the inner rod is provided with a conical head, and the position where the conical head connects to the inner rod is provided with a step surface, and the tube end of the U-shaped tube can be abutted against the step surface.

[0012] The rotating disk is provided with a shaping cylinder and a shaping rod driven by the shaping cylinder, and the shaping rod is provided with a shaping hole.

[0013] The machine platform is provided with a pressing frame, a pressing driving unit arranged on the pressing frame, and a pressing plate driven by the pressing driving unit.

[0014] An auxiliary positioning groove is provided on the outer edge of the turntable, a positioning drive unit and a positioning rod driven by the positioning drive unit are provided on the machine platform, a positioning wheel matching the auxiliary positioning groove is provided at the end of the positioning rod, and the circulating feeding mechanism includes a circulating driving motor, a driving gear connected to the circulating driving motor, and a driven gear arranged on the rotating shaft of the turntable, and the rotating shaft is arranged on the machine platform through a bearing.

[0015] The beneficial effects of the utility model are as follows: the utility model integrates the pipe bending device and the collar device on one machine, realizes the transportation of the pipe bending device to the clamp unit through the conveying device, realizes the fixed clamping of the U-shaped pipe through the clamp unit, realizes the positioning of the U-shaped pipe and the collar device through the circulating feeding mechanism, and finally puts the metal welding ring on the tube pin of the U-shaped pipe through the collar device. The above equipment has a high degree of automation, which improves the production efficiency of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is an overall view of the utility model;

[0018] Figure 2 It is an overall view of the utility model from another direction;

[0019] Figure 3 It is a view of the circulating feeding mechanism;

[0020] Figure 4 It is the structural view of the push component;

[0021] Figure 5 It is the structural view of the fixture unit;

[0022] Figure 6 is a structural view of the collar device;

[0023] Figure 7 It is a partial structural exploded view of the collar device;

[0024] Figure 8 It is a structural view of the plastic part;

[0025] Fig. 9 It is a structural view to assist in positioning the workpiece. DETAILED DESCRIPTION

[0026] The advantages and features of the present disclosure and its implementation methods will be explained by the following embodiments described with reference to the accompanying drawings. However, the present disclosure can be embodied in different forms and should not be interpreted as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be comprehensive and complete, and will fully convey the scope of the present disclosure to those skilled in the art. In addition, the present disclosure is limited only by the scope of the claims.

[0027] The shapes, sizes, ratios, angles and numbers disclosed in the drawings for describing the embodiments of the present disclosure are only examples, and therefore the present disclosure is not limited to the details shown. Throughout this specification, the same reference numerals refer to the same elements. In the following description, when the detailed description of the relevant known functions or configurations is determined to be unnecessary to blur the focus of the present disclosure, the detailed description will be omitted. In the case of using "including", "having" and "comprising" described in this specification, other parts may be added unless "only" is used. Unless otherwise indicated, the terms in the singular may include plural forms.

[0028] When explaining an element, although not explicitly described, the element is understood to include a range of error.

[0029] When describing a positional relationship, for example, when the positional relationship is described as "on," "above," "below," and "adjacent to," unless "immediately" or "directly" is used, one or more parts may be arranged between two other parts.

[0030] When describing a time relationship, for example, when a time sequence is described as “after,” “subsequently,” “next,” and “before,” discontinuous cases may be included unless “just” or “directly” is used.

[0031] It should be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from other elements. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of the present disclosure.

[0032] As those skilled in the art can fully understand, the features of the different embodiments of the present disclosure can be coupled or combined with each other in part or in whole, and can cooperate with each other in various ways and be driven technically. The embodiments of the present disclosure can be performed independently of each other, or can be performed together in a mutually dependent relationship.

[0033] Reference Figures 1 to 9 The utility model discloses a fully automatic small U-tube bending and ringing integrated machine, comprising a machine platform 1, a feeding device (not shown in the figure) and a pipe bending device 2 arranged on the machine platform 1, wherein the feeding device supplies the pipe fittings to the pipe bending device 2, and the machine platform 1 is also provided with a collar device 3, a conveying device 4 and a circulating feeding mechanism 5, and a clamp unit 6 is provided on a turntable 19 of the circulating feeding mechanism 5, and the pipe bending device 2 bends the pipe fittings into a U-shaped pipe 7 and then conveys it to the clamp unit 6 through the conveying device 4 for clamping and fixing, and the clamped and fixed U-shaped pipe 7 is conveyed to the working position of the collar device 3 through the turntable 19, and the collar device 3 can put a metal welding ring on the pipe pin of the U-shaped pipe. In the above structure, the feeding device and the pipe bending device 2 are the same as the previous structure, and therefore are not described in detail.

[0034] like Figure 1 and 2As shown, the conveying device 4 includes a feeding funnel 8, a feeding trough 9, a discharging hopper 10, a vibration disk assembly 11 and a pushing assembly. The feeding trough 9 is provided with a feeding motor 12 and a belt transmission unit. The conveyor belt of the belt transmission unit is located in the feeding trough 9. The output end of the feeding funnel 8 is located above the feeding trough 9. The end of the feeding trough 9 is provided with a guide groove. The outlet of the guide groove is located above the vibration disk assembly 11. The vibration disk assembly 11 can convey the U-shaped tube 7 to the pushing assembly and send the U-shaped tube 7 to the clamp unit 6 for clamping through the pushing assembly. Through the above structure, the U-shaped tube 7 bent by the tube bending device 2 falls into the feeding funnel 8 and is sent into the feeding trough 9 through the feeding funnel 8. The feeding trough 9 has a power system, and the power system includes a feeding The feeding motor 12 and the belt transmission unit, the conveyor belt of the belt transmission unit is located in the feeding trough 9, so that the U-shaped tube 7 is transported to the discharge hopper 10 through the conveyor belt, and the discharge hopper 10 then leaks into the vibration disk assembly 11, and the vibration disk assembly 11 transports the U-shaped tube 7 to the pushing assembly through the vibration groove 18. The U-shaped tube 7 stands up in the vibration groove 18 with the front and back sides closely attached to each other and arranged in a row, with the tube feet facing downward and supported by the bottom of the groove, and the curved section facing upward. The vibration groove 18 is a closed arc groove. When the U-shaped tube 7 is transported to the bottom of the groove, the position becomes that the front or back side of the U-shaped tube 7 is attached to the bottom of the pushing hole 17. In the above structure, the vibration disk assembly 11 is a purchased product, the feeding motor 12 and the belt transmission unit are also commonly used transmission structures in this field, so its specific structure is not described in detail.

[0035] like Figure 4 As shown, the pushing assembly includes a pushing drive unit 13, a pushing rod 14, a pushing seat 15, and a guide groove 16 and a pushing hole 17 arranged on the pushing seat 15. The pushing hole 17 is connected with the guide groove 16. The pushing rod 14 is located in the pushing hole 17 and is connected to the pushing drive unit 13. The output end of the vibration groove 18 is connected with the guide groove 16. The U-shaped tube 7 slides into the guide groove 16 by gravity. The guide groove 16 is a square groove and a semi-closed groove. The width of the guide groove 16 is equivalent to the width of the U-shaped tube 7, but the width of the notch is smaller than the width of the U-shaped tube 7. Therefore, the U-shaped tube 7 will not fall out of the groove or deflect in the groove. The U-shaped tube 7 slides into the pushing hole 17 through the guide groove 16. The tube foot of the U-shaped tube 7 naturally faces the rod end of the pushing rod 14. The pushing rod 14 pushes the U-shaped tube 7 into the clamp unit 6 through the driving of the pushing drive unit 13. The pushing drive unit 13 in the above-mentioned is a cylinder.

[0036] like Figure 3As shown, the clamp unit 6 includes a clamping drive unit (not shown in the figure), a lifting push block 20 connected to the clamping drive unit, a lower clamping seat 21, a movable seat 22 and a clamping groove 23 located between the lower clamping seat 21 and the movable seat 22, wherein the clamping groove 23 is partially located on the movable seat 22 and the other part is located on the movable seat 22. Of course, the shape of the clamping groove 23 corresponds to that of the U-shaped tube 7 and is slightly smaller in size, so that it can be clamped. A sliding hole 1 is relatively provided on the movable seat 22, a sliding rod 24 is located in the sliding hole 1, and an end of the sliding rod 24 is fixed to the turntable 19, one end of the connecting rod 20 is fixed to the movable seat 22 and the connecting rod 20 is slidably matched with the sliding hole 2 on the turntable 19, an end plate 27 fixed to the connecting rod 26 is provided below the turntable 19, a clamping spring 25 is provided on the sliding rod 24, and one end of the clamping spring 25 is fixed to the sliding rod The end cap of 24 abuts against each other, and the other end of the clamping spring 25 abuts against the movable seat 22. The lifting push block 20 can lift the end plate 27 under the drive of the clamping drive unit. The working principle of the above structure is that when a U-shaped tube 7 needs to be sent into the clamp, the lifting push block 20 lifts the end plate 27 under the drive of the clamping drive unit, thereby lifting the movable seat 22 through the connecting rod 26, and the movable seat 22 will squeeze the clamping spring 25 along the sliding rod 24 to compress the clamping spring 25, and at the same time the clamping groove 23 is opened. At this time, the pushing rod 14 pushes the U-shaped tube 7 into the groove of the lower clamping seat 21 through the drive of the pushing drive unit 13, and then the clamping drive unit drives the lifting push block 20 to retract, so that the clamping spring 25 pushes the movable seat 22 to reset and clamp the U-shaped tube 7. The above structure is simple and can realize the opening and closing of the clamping.

[0037] Furthermore, an auxiliary positioning groove 29 is provided on the outer edge of the turntable 19, and the auxiliary positioning groove 29 is a semicircular groove. The machine 1 is provided with a positioning drive unit 30 and a positioning rod 31 driven by the positioning drive unit 30, and the end of the positioning rod 31 is provided with a positioning wheel 32 matching the auxiliary positioning groove 29. The circulating feeding mechanism 5 includes a circulating drive motor, a driving gear connected to the circulating drive motor, and a driven gear arranged on the rotating shaft of the turntable 19. The rotating shaft is arranged on the machine 1 through a bearing. The positioning drive unit 30 is a cylinder. Because the present application adopts a gear-type transmission, and because there is a gap between the gear teeth, the present application designs a positioning wheel 32 to match the auxiliary positioning groove 29 for auxiliary positioning. This not only has a simple structure but also has low cost.

[0038] like Figure 6 and 7As shown, the ring device 3 is used to put a metal welding ring on the tube pin of the U-shaped tube 7. The ring device 3 includes a vibrating feeding plate 41, a guide plate 42, a ring seat 43, a ring driving unit 44 and a ring assembly arranged on the ring seat 43. The vibrating feeding plate 41 is a purchased part and its specific structure is not described in detail. The guide plate 42 is provided with a guide hole 45 and a ring hole 46 that penetrates the guide hole 45. The hole wall of the ring hole 46 is not provided with a positioning groove 47. The ring assembly is driven by the ring driving unit 44 to pass through the ring hole 46 to drive the ring and put it on the U-shaped tube 7. The vibrating feeding plate 41 sends the welding ring to the guide hole 45 of the guide plate 42 through the vibration groove 18, and then falls from the guide hole 45 into the positioning groove 47 in the ring hole 46. At this time, the metal welding ring is in a vertical state and the ring hole of the metal welding ring basically overlaps with the ring hole 46.

[0039] As a specific structure, the collar assembly includes an inner rod 48 and an outer tube 49. Of course, in order to facilitate manufacturing and assembly, there is also a rod seat 51, which is connected to the collar drive unit 44 and the outer tube 49 can be fixed to the rod seat 51 by screws. The inner rod 48 is located in the outer tube 49 and slides with the outer tube 49. The outer tube 49 is provided with a reset spring (not shown in the figure) for resetting the inner rod 48. The end of the inner rod 48 is provided with a conical head, and the position where the conical head connects to the inner rod 48 is provided with a step surface 50, and the tube end of the U-shaped tube 7 can be abutted against the step surface 50.

[0040] As shown in the figure, the collar mechanism also includes a vertical plate 33 arranged on the rod seat 51, two sliding shafts 34 are relatively fixed on the vertical plate 33, the sliding shaft 34 is slidably matched with the guide plate 42, and a pin seat plate 1 35 and a pin seat plate 2 36 are fixed on the sliding shaft 34, the pin seat plate 1 35 and the pin seat plate 2 36 are respectively located on both sides of the guide plate 42, the guide hole 45 is provided with a pin hole 1 and a pin hole 2 penetrating the guide plate 42, the pin hole 1 is located above the pin hole 2, the pin seat plate 1 35 is provided with a plug 1 37 that can be inserted into the pin hole 1, and the pin seat plate 2 36 is provided with a plug 2 38 that can be inserted into the pin hole 2. Through the above structure, the metal welding rings can be controlled to fall into the collar hole 46 one by one along the guide hole 45 in sequence. When the inner rod 48 is at the initial position without the collar, the second pin 38 is not inserted into the second pin hole and will not block the metal welding ring from falling. At this time, the first pin 37 passes through the first pin hole and enters the guide hole 45 to be inserted into the first metal welding ring at the same height, thereby blocking the first metal welding ring and the metal welding rings above it from falling. When the inner rod 48 is collaring, the second pin 38 moves toward the second pin hole, and the first pin 37 gradually withdraws from the first pin hole. Finally, when the inner rod 48 sends the metal welding ring located in the collar hole 46 to the predetermined position of the U-shaped tube 7, the first pin 37 completely withdraws from the first pin hole, and the second pin 38 is completely inserted into the second pin hole. At the same time, the first metal welding ring is The first metal welding ring falls to a position between the first pin 37 and the second pin 38, and the second metal welding ring falls to a position at the same height as the first pin 37, and the second pin 38 blocks the first metal welding ring to prevent it from falling, and then the inner rod 48 returns to its initial position, and the second pin 38 also completely withdraws from the second pin hole and no longer blocks the first metal welding ring. At the same time, the first pin 37 passes through the first pin hole and enters the guide hole 45 to be inserted into the second metal welding ring, thereby blocking the second metal welding ring from falling, but the first metal welding ring can now fall into the ring hole 46 along the guide hole 45 to wait for the ring, and the above process is repeated, thereby realizing the sequential execution of the ring.

[0041] The principle of the above structure is that the ring driving unit 44 drives the ring assembly to move, the inner rod 48 penetrates into the metal welding ring located in the positioning groove 47, and lifts the metal welding ring to disengage from the positioning groove, thereby driving the metal welding ring to pass through the ring hole 46. After moving a certain distance, the end of the inner rod 48 is inserted into the pipe mouth until the step surface 50 abuts against the pipe mouth. At this time, the outer tube 49 continues to move, and the tube pin will be inserted into the outer tube 49, but the outer tube 49 will push the metal welding ring to continue to move and sleeve on the tube pin until it reaches the predetermined position. Finally, the ring driving unit 44 drives the ring assembly to retreat, and the inner rod 48 will also be reset under the action of the reset spring.

[0042] Of course, there is a convex ring between the inner rod 48 and the inner hole of the outer tube 49 to restrict each other to prevent the inner rod 48 from falling out of the outer tube 49 under the action of the return spring; and the tube end of the outer tube 49 also has a threaded plug, so as to seal the return spring in the outer tube 49 and prevent it from falling out.

[0043] The above is a detailed introduction to a fully automatic small U-tube bending and ring-up integrated machine provided by an embodiment of the utility model. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model; at the same time, for general technical personnel in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A fully automatic small U-tube bending and ringing integrated machine, comprising a machine platform, a feeding device and a tube bending device arranged on the machine platform, wherein the feeding device supplies the tube fittings to the tube bending device, and is characterized in that: The machine is also provided with a conveying device, a circulating feeding mechanism, and a ring device. The turntable of the circulating feeding mechanism is provided with a clamp unit. The pipe bending device bends the pipe into a U-shaped pipe and then transports it to the clamp unit for clamping and fixing through the conveying device. After the U-shaped pipe is fixed, the turntable rotates to send it to the working position of the ring device. The ring device can put a metal welding ring on the tube pin of the U-shaped pipe.

2. The fully automatic small U-tube bending and ring-up integrated machine according to claim 1 is characterized by: The conveying device includes a feeding funnel, a feeding trough, a discharging hopper, a vibration plate assembly and a pushing assembly. The feeding trough is provided with a feeding motor and a belt transmission unit. The conveyor belt of the belt transmission unit is located in the feeding trough. The output end of the feeding funnel is located above the feeding trough. A guide groove is provided at the end of the feeding trough. The outlet of the guide groove is located above the vibration plate assembly. The vibration plate assembly can convey the U-shaped tube to the pushing assembly and send the U-shaped tube to the clamp unit for clamping through the pushing assembly.

3. The fully automatic small U-tube bending and ring-up integrated machine according to claim 2 is characterized by: The pushing assembly includes a pushing drive unit, a pushing rod, a pushing seat, and a guide groove and a pushing hole arranged on the pushing seat. The pushing hole is connected to the guide groove, and the pushing rod is located in the pushing hole and connected to the pushing drive unit.

4. The fully automatic small U-tube bending and ring-up integrated machine according to claim 1 is characterized by: The clamping unit includes a clamping drive unit, a lifting and pushing block connected to the clamping drive unit, a lower clamping seat, a movable seat and a clamping groove located between the lower clamping seat and the movable seat, the movable seat is relatively provided with a sliding hole one, the sliding rod is located in the sliding hole one, and the end of the sliding rod is fixed to the turntable, one end of the connecting rod is fixed to the movable seat and the connecting rod is slidably matched with the sliding hole two on the turntable, an end plate fixed to the connecting rod is provided under the turntable, a clamping spring is provided on the sliding rod, one end of the clamping spring is abutted against the end cap of the sliding rod, and the other end of the clamping spring is abutted against the movable seat, and the lifting and pushing block can lift the end plate under the drive of the clamping drive unit.

5. The fully automatic small U-tube bending and ring-up integrated machine according to claim 1 is characterized by: The collar device includes a vibrating feed plate, a guide plate, a collar seat, a collar drive unit and a collar assembly arranged on the collar seat, wherein the guide plate is provided with a guide hole and a collar hole communicating with the guide hole, the hole wall of the collar hole is not provided with a positioning groove, and the collar assembly is driven by the collar drive unit to pass through the collar hole to drive the collar and be sleeved on the U-shaped tube.

6. The fully automatic small U-tube bending and ring-up integrated machine according to claim 5 is characterized by: The collar assembly includes an inner rod and an outer tube, the inner rod is located in the outer tube and slidably cooperates with the outer tube, the outer tube is provided with a reset spring for resetting the inner rod, the end of the inner rod is provided with a conical head, and the position where the conical head connects to the inner rod is provided with a step surface, and the tube end of the U-shaped tube can be abutted against the step surface.

7. The fully automatic small U-tube bending and ring-up integrated machine according to claim 1 is characterized by: The rotating disk is provided with a shaping cylinder and a shaping rod driven by the shaping cylinder, and the shaping rod is provided with a shaping hole.

8. The fully automatic small U-tube bending and ring-up integrated machine according to claim 1 is characterized by: The machine platform is provided with a pressing frame, a pressing driving unit arranged on the pressing frame, and a pressing plate driven by the pressing driving unit.

9. The fully automatic small U-tube bending and ring-up integrated machine according to claim 1 is characterized by: An auxiliary positioning groove is provided on the outer edge of the turntable, a positioning drive unit and a positioning rod driven by the positioning drive unit are provided on the machine platform, a positioning wheel matching the auxiliary positioning groove is provided at the end of the positioning rod, and the circulating feeding mechanism includes a circulating driving motor, a driving gear connected to the circulating driving motor, and a driven gear arranged on the rotating shaft of the turntable, and the rotating shaft is arranged on the machine platform through a bearing.

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