Automatic peeling equipment for plastic pipes

Abstract

The invention relates to the technical field of plastic pipe processing, and particularly discloses a plastic pipe automatic peeling device which comprises a traction machine and further comprises a peeling knife, a supporting roller and a supporting groove, the peeling knife and the supporting roller are both located in the traction direction of the traction machine, and the peeling knife and the supporting roller are both located on one side of the input end of the traction machine; the distance between the peeling knife and the traction machine is smaller than the distance between the supporting roller and the traction machine, a supporting groove used for supporting a pipe is formed between the supporting roller and the traction machine, the peeling knife is located above the supporting groove, the supporting groove is in a V shape or a circular arc shape, and at least one of the peeling knife and the supporting roller can ascend and descend. According to the scheme, the problems that the efficiency of manual peeling is low and the resource utilization rate is low and the cost is increased when a machine automatically cuts off the pipe with the code spraying function at present are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic pipe processing, and particularly relates to an automatic peeling device for plastic pipes. Background Art

[0002] In the production and manufacturing process of plastic pipes (especially various water pipes), in order to facilitate identification, traceability, and management, manufacturers with strict product quality control usually spray ink codes containing information such as pipe name, specification model, execution standard, and manufacturer identification on the outer surface of the pipes at fixed intervals.

[0003] However, when the pipes need to be recycled, crushed, remelted, granulated, and reused due to quality defects, transportation damage, or other reasons during the production process, the presence of these surface ink markings will bring significant problems. The main components of the ink (such as pigments, resins, solvents, etc.) have differences in physical and chemical properties from the thermoplastic plastics of the pipe itself (such as PVC, PPR, PE, etc.). If the pipes with ink markings are directly crushed and recycled, the ink impurities will be mixed into the recycled plastic particles. During the subsequent process of remelting and extruding these impurities into new pipes, the ink may become heterogeneous nucleation points or impurity points, affecting the appearance quality and may reduce the mechanical strength (such as impact resistance, tensile strength), weather resistance, or thermal stability of the recycled material. Therefore, effectively removing the ink code markings on the pipe surface before recycling is a key step to ensure the quality of the recycled material.

[0004] Currently, there are two main methods in the industry for dealing with the recycling and reuse of pipes with ink codes: Method 1 is manual scraping: The operator uses simple tools such as scrapers to manually scrape off the ink markings on the pipe surface. This method has a high labor intensity, low work efficiency, and there is a safety risk due to the operation of holding sharp tools, and the scraping effect depends on the skills and responsibility of the workers.

[0005] Method 2 is to cut off and discard the section with the ink code: In order to pursue efficiency, some manufacturers choose to directly cut off the pipe section with the ink marking and discard it as waste, and only use the pipe section without markings for recycling. Although this method is relatively simple and fast to operate, the cut-off and discarded pipe sections (even if there is only a small amount of ink code) still contain a large amount of recyclable qualified plastic raw materials, resulting in low resource utilization rate and significantly increasing production costs. Summary of the Invention

[0006] The present invention aims to provide an automatic peeling device for plastic pipes to solve the problems of low efficiency of manual peeling and low resource utilization rate and increased costs in the automatic cutting of pipes with ink codes.

[0007] To achieve the above object, the present invention adopts the following technical solutions: An automatic peeling device for plastic pipes, including a tractor, further comprising a peeling knife, a supporting roller and a supporting groove. The peeling knife and the supporting roller are both located in the traction direction of the tractor, and both the peeling knife and the supporting roller are located on one side of the input end of the tractor. The distance between the peeling knife and the tractor is less than the distance between the supporting roller and the tractor. A supporting groove for supporting the pipe is provided between the supporting roller and the tractor. The peeling knife is located above the supporting groove. The supporting groove is V-shaped or arc-shaped. At least one of the peeling knife and the supporting roller can be lifted and lowered.

[0008] The principle and advantages of this solution are as follows: When adopting this solution, when it is necessary to peel and scrape the inkjet marks on the pipe, only need to insert the pipe into the supporting groove, and let the tractor pull the pipe to move. The supporting roller gives an upward supporting force to the pipe, and the peeling knife contacts the surface of the pipe downward, forcing the pipe to form an angle with the supporting groove. The peeled section of the pipe is continuously pulled forward by the tractor, while the section of the pipe to be peeled is pushed upward by the supporting roller to be inclined, so as to facilitate the peeling knife to peel off the inkjet marks on the moving pipe, realizing automatic peeling. Compared with the prior art, this solution has high peeling efficiency, and there are no problems of high labor intensity, low efficiency and potential safety hazards in manual operation, nor the waste caused by the pipe in the form of cut sections. This solution helps to improve the resource utilization rate and thus reduce costs.

[0009] In addition, in this solution, at least one of the peeling knife and the supporting roller can be lifted and lowered, so as to facilitate the pipe to be inserted between the peeling knife and the supporting groove labor-savingly before being inserted into the tractor.

[0010] Preferably, as an improvement, the peeling knife is fixed on a lifter, and the supporting roller can be adjusted in height, so as to facilitate that after peeling one pipe, the lifter drives the peeling knife to rise to prepare for the smooth insertion of the next pipe into the tractor, and the height of the supporting roller is adjustable to adapt to the peeling of pipes with different outer diameter specifications, improving adaptability.

[0011] Preferably, as an improvement, it further includes a position sensor arranged between the tractor and the peeling knife. The position sensor is connected to a control system. The control system is used to control the peeling knife to move downward after the position sensor senses the pipe, and the control system is used to control the peeling knife to move upward after the position sensor does not sense the pipe, so as to automatically move downward to contact the pipe when peeling is required, and after peeling each pipe is completed, automatically control the peeling knife to rise to further improve the degree of automation.

[0012] Preferably, as an improvement, it further includes an inkjet printer located between the tractor and the peeling knife. Adding an inkjet printer in this solution enables that when it is not necessary to peel but to inkjet the pipe, only need to control the peeling knife to rise, and make way for the moving channel of the pipe, then the pipe can be inkjet under the cooperation of the tractor and the inkjet printer.

[0013] Preferably, as an improvement, the control system includes a peeling mode and a coding mode. In the peeling mode, after the in-place sensor senses the pipe, the control system controls the lifter to drive the peeling knife to move downward to a set height. In the coding mode, the control system controls the peeling knife to always be at a height that does not affect the free movement of the pipe. The control system is used to control the coder to perform coding after the in-place sensor senses the pipe. This solution realizes the rapid switching between peeling and coding. Before coding, adjust the height of the support roller so that the pipe will not be pushed up and warped by the support roller after being clamped by the tractor.

[0014] Preferably, as an improvement, the peeling edge of the peeling knife is arc-shaped so that the arc-shaped edge fits more closely to the arc-shaped surface of the pipe, facilitating the peeling of the coding on the surface of pipes of different specifications.

[0015] Preferably, as an improvement, the support roller is provided with a V-shaped or arc-shaped supporting groove so that the pipe will not shift during the peeling process.

[0016] Preferably, as an improvement, the tractor includes an upper traction belt and a lower traction belt. A traction channel for the pipe is formed between the upper traction belt and the lower traction belt, and both the upper traction belt and the lower traction belt can be adjusted in height.

[0017] Preferably, as an improvement, a rotary pushing mechanism is further included. The rotary pushing mechanism and the support groove are located on both sides of the conveying direction of the support roller. The rotary pushing mechanism includes a supporting component, a pipe feeder, and a rotator. The supporting component includes a plurality of supporting rollers for supporting the pipe. The pipe feeder is used to insert the pipe on the supporting rollers into the tractor. The rotator is used to drive the pipe to rotate to a set orientation. In this solution, by setting the rotator, the pipe can automatically align the coding position to be peeled with the peeling knife. At the same time, the pipe feeder is used to automatically insert the pipe into the tractor.

[0018] Preferably, as an improvement, the rotator includes a chuck, a rotary drive, and a color mark sensor. The chuck is used to clamp the pipe. The chuck is installed at the output end of the rotary drive. The rotary drive is used to drive the chuck to rotate. The color mark sensor is used to sense the color change on the pipe. The color mark sensor is connected to the control system. The control system is used to control the rotary drive to stop rotating and the chuck to release the pipe after the color mark sensor senses a set color. The structure of the rotator in this solution is simple and easy to implement.

[0019] Preferably, as an improvement, the rotator is installed at the output end of the pipe feeder. The pipe feeder is used to drive the rotator to move along the axial direction of the pipe to further simplify the structure.

[0020] Preferably, as an improvement, it further includes an automatic feeding mechanism. The automatic feeding mechanism includes a support frame and a lifting pipe gripper. The support frame is provided with an inclined pipe placing plate, and a blocking rod is fixed on the side where the pipe placing plate inclines downward. The lifting pipe gripper includes a lifting machine and a top plate fixed on the lifting machine. The top surface of the top plate has an inclined surface, and the inclined surface inclines downward towards the supporting roller. Each time the top plate rises, it will push up the pipe closest to the blocking rod. The lifted pipe can move along the inclined surface towards the supporting roller. When adopting this solution, the pipes are laid flat on the inclined pipe placing plate one by one, and due to the inclined setting, the pipes have a tendency to automatically move closer to the blocking rod. During peeling, the action of the lifting pipe gripper pushing up is used to take out the pipe closest to the blocking rod from the pipe placing plate and drop it onto the supporting roller, realizing the operation of automatically taking away one pipe each time.

[0021] Preferably, as an improvement, the end of the inclined surface of the top plate facing downward is provided with an upward convex blocking portion. The automatic feeding mechanism further includes a fixedly installed guiding plate. The guiding plate is provided with an inclined guiding surface and a limiting through groove closely connected to the lower end of the guiding surface. The limiting through groove is directly opposite to the supporting roller. So when taking the pipe, the lifting pipe gripper drives the top plate to rise to transfer a pipe onto the top plate. After the top plate descends until the blocking portion is lower than the guiding surface, the pipe accurately falls onto the supporting roller along the guiding surface, ensuring the accurate feeding of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structure diagram of Embodiment 1 of the present invention.

[0023] Figure 2 It is Figure 1 The three-dimensional structure diagram after rotating the angle.

[0024] Figure 3 It is Figure 1 The front view of

[0025] Figure 4 It is Figure 1 The right view of

[0026] Figure 5 It is Figure 1 The three-dimensional structure diagram showing the tractor, peeling knife, supporting roller and supporting groove in

[0027] Figure 6 It is Figure 5 The rear view of

[0028] Figure 7 It is Figure 5 The right view of

[0029] Figure 8 It is Figure 5 The three-dimensional structure diagram showing only the peeling knife, supporting roller and supporting groove in

[0030] Figure 9 Three-dimensional structural schematic diagram when a plurality of adjustment holes are arranged in the height direction on the support frame for the support roller.

[0031] Figure 10 Schematic diagram of the present invention during peeling (it can be seen in the figure that the pipe is lifted by the support roller and is inclined, and the tractor continuously pulls the pipe).

[0032] Figure 11 Partial three-dimensional structural schematic diagram of the present invention for showing the rotary pushing mechanism.

[0033] Figure 12 Partial three-dimensional structural schematic diagram of the present invention for showing the automatic feeding mechanism.

[0034] The reference numerals in the accompanying drawings of the specification include: tractor 1, peeling knife 2, lifter 21, support roller 3, adjusting frame 31, strip groove 311, adjusting hole 312, support groove 4, rotary pushing mechanism 5, supporting roller 51, pipe feeder 52, support seat 521, first-level linear driver 520, base 522, rotator 53, chuck 531, contact rod 5311, rotary drive motor 532, color mark sensor 533, auxiliary roller 534, automatic feeding mechanism 6, support frame 61, pipe placing plate 611, blocking rod 612, baffle 613, lifting pipe picker 62, top plate 621, blocking portion 6211, guiding plate 63, guiding surface 631, limiting through groove 632, In-place sensor 10, inkjet printer 20, frame 100, pipe 200. Detailed Description of the Invention

[0035] The following is a further detailed description through specific embodiments: Embodiment 1 Combined with Figures 1 to 12 As shown, an automatic peeling device for plastic pipes includes a tractor 1, a peeling knife 2, a support roller 3, a support groove 4, a rotary pushing mechanism 5 and an automatic feeding mechanism 6.

[0036] The tractor 1, the peeling knife 2, the support roller 3 and the rotary pushing mechanism 5 are arranged in sequence. The automatic feeding mechanism 6 is used to send one pipe to the rotary pushing mechanism 5 each time, and the rotary pushing mechanism 5 is used to rotate the pipe to a set orientation and to push the pipe to the tractor 1.

[0037] The specific structure is as follows: I. Tractor 1, peeling knife 2, support roller 3 and support groove 4 Combined with Figures 5 to 10, the tractor 1 is a tractor 1 used for pulling plastic pipes in the art. The tractor 1 includes an upper pulling belt and a lower pulling belt. A pulling channel for the pipe is formed between the upper pulling belt and the lower pulling belt, and both the upper pulling belt and the lower pulling belt can be adjusted in height.

[0038] A support groove 4 is fixed below the peeling knife 2. The support groove 4 is V-shaped or arc-shaped. In this embodiment, the support groove 4 is V-shaped. The peeling knife 2 is fixed on the output end of the lifter 21, and the peeling knife 2 is driven by the fixedly installed lifter 21 to perform lifting adjustment. The lifter 21 can be a cylinder.

[0039] The support roller 3 can be adjusted in height. In one way, for example Figure 8 as shown, the support roller 3 is installed on the adjusting frame 31. A vertical strip-shaped groove 311 (or multiple adjusting holes 312 at different heights, such as Figure 9 as shown) is provided on the adjusting frame 31. The adjusting frame 31 can be fixed on the mounting hole of the machine frame 100 through bolts, and the height of the support roller 3 is adjusted by adjusting the locking position of the bolts; in another way, the support roller 3 is installed on a provided elevator, and the height of the support roller 3 is controlled by the elevator. The elevator can also be a cylinder.

[0040] The support roller 3 is provided with a V-shaped or arc-shaped supporting groove so that the pipe does not shift during the peeling process. When the support roller 3 is used for peeling, the supporting point of the support roller 3 on the pipe is higher than the supporting point of the support groove 4 on the pipe.

[0041] The peeling edge of the peeling knife 2 is arc-shaped so that the arc-shaped edge fits better with the arc-shaped surface of the pipe, facilitating the complete peeling of the ink jet code on the surface of pipes of different specifications.

[0042] It also includes a position sensor 10 arranged between the tractor 1 and the peeling knife 2. The position sensor 10 is connected to the control system provided on the automatic peeling equipment for plastic pipes. The control system is used to control the peeling knife 2 to move downward after the position sensor 10 senses the pipe, and the control system is used to control the peeling knife 2 to move upward after the position sensor 10 does not sense the pipe, so as to automatically move downward to contact the pipe for peeling when peeling is required. When peeling, the peeling knife 2 cuts into the pipe to a certain depth, and the section of the pipe between the peeling knife 2 and the support roller 3 is inclined, so that the peeling knife 2 always inserts into the pipe epidermis to a certain depth, ensuring that the ink jet code is completely peeled off. After the peeling of each pipe is completed, the peeling knife 2 is automatically controlled to rise to provide space for the smooth insertion of the pipe into the tractor 1.

[0043] It also includes an inkjet printer 20 located between the tractor 1 and the peeling knife 2. In this embodiment, the addition of the inkjet printer 20 enables, when it is not necessary to peel the pipe but to perform inkjet coding on the pipe, that before preparing for inkjet coding, only need to control the peeling knife 2 to rise first and adjust the height of the support roller 3 to make way for the movement channel of the pipe, then the pipe can be inkjet-coded under the cooperation of the tractor 1 and the inkjet printer 20.

[0044] II. Rotating and Pushing Mechanism 5 and Automatic Feeding Mechanism 6 Combined with Figures 1 - 4 , Figure 11 , the rotating and pushing mechanism 5 and the support groove 4 are located on both sides of the conveying direction of the support roller 3. The rotating and pushing mechanism 5 includes a supporting component, a pipe feeder 52 and a rotator 53. The supporting component includes a plurality of supporting rollers 51 for supporting the pipe. The structure of the supporting roller 51 is the same as that of the support roller 3, and the supporting roller 51 is installed on the frame 100.

[0045] The pipe feeder 52 is used to insert the pipe on the supporting roller 51 onto the tractor 1, and the rotator 53 is used to drive the pipe on the supporting roller 51 to rotate to a set orientation.

[0046] Specifically: The pipe feeder 52 is a linear drive structure. The pipe feeder 52 is installed on the frame 100. In this embodiment, the pipe feeder 52 uses a cylinder. A support seat 521 is fixed to the output end of the pipe feeder 52, and the rotator 53 is fixed to the support seat 521. When the pipe feeder 52 is activated, it drives the support seat 521 to move along the axial direction of the pipe, that is, it also drives the rotator 53 to move along the axial direction of the pipe.

[0047] The rotator 53 includes a chuck 531, a rotation drive motor 532 and a color mark sensor 533. The color mark sensor 533 is fixedly installed and is used to sense the color change on the pipe. The rotation drive motor 532 is fixed to the support seat 521, and the output end of the rotation drive motor 532 is fixed with the chuck 531. The rotation drive motor 532 is used to drive the chuck 531 to rotate. The chuck 531 is provided with jaws. In this embodiment, the chuck 531 is a pneumatic three-jaw chuck 531. A contact rod 5311 is fixed to each jaw of the chuck 531, and the pipe is clamped by the contact rods 5311 on the mutually approaching jaws. To enable the pipe to be rotated stably, an auxiliary roller 534 is installed on the support seat 521. The structure of the auxiliary roller 534 is the same as that of the support roller 51 and the installation height is the same. The auxiliary pipe roller, the supporting roller and the support roller 3 are all non-powered rollers. The auxiliary roller 534 is arranged directly in front of the chuck 531 in the direction towards the pipe.

[0048] The color mark sensor 533 is connected to the control system. The control system is used to control the rotation drive motor 532 to stop rotating and control the chuck 531 to release the pipe after the color mark sensor 533 senses the set color.

[0049] Combined with Figures 1 - 4 、 Figure 12 The automatic feeding mechanism 6 includes a support frame 61, a lifting pipe picker 62 and a guiding plate 63. An inclined pipe placing plate 611 is also fixed on the support frame 61. Both the pipe placing plate 611 and the lifting pipe picker 62 are located on the side of the supporting roller 51. A blocking rod 612 is fixed on the downward inclined side of the pipe placing plate 611. The lifting pipe picker 62 includes a lifting machine and a top plate 621 fixed on the lifting machine. The top surface of the top plate 621 has an inclined surface, and an upward protruding blocking part 6211 is integrally formed at the low end of the inclined surface. The blocking part 6211 and the inclined surface form an inclined limiting area. There are at least two top plates 621 and guiding plates 63. Each time the top plate 621 rises, it will push up the pipe closest to the blocking rod 612. All the top plates 621 and guiding plates 63 are arranged along the axial direction of the pipe. The top surface of the guiding plate 63 is provided with an inclined guiding surface 631, and the guiding surface 631 is inclined downward towards the supporting roller 51. A limiting through groove 632 is opened immediately at the low end of the guiding surface 631 of the guiding plate 63, and the limiting through groove 632 is aligned with the V-shaped supporting groove / arc-shaped supporting groove of the supporting roller 51.

[0050] In this embodiment, in order to achieve the consistency of pipe arrangement, a baffle 613 is fixed on the support frame 61. The baffle 613 is located at the side end of the pipe placing plate 611. The baffle 613 is used to be in contact with one end face of the pipe. When placing the pipes, as long as all the pipes are attached to the baffle 613, the placement consistency of pipes of the same specification can be ensured.

[0051] In this embodiment, in order to enable automatic peeling of pipes of different lengths or automatic feeding to the inkjet printer 20 for inkjet printing, the pipe feeder 52 is set to two-stage pipe feeding. Specifically: the pipe feeder 52 includes a first-stage linear driver and a second-stage linear driver with parallel output directions. Both the first-stage linear driver and the second-stage linear driver can use cylinders. The output end stroke of the first-stage linear driver is less than the output end stroke of the second-stage linear driver. The first-stage linear driver 520 is fixed to the output end of the second-stage linear driver (the second-stage linear driver is not shown in the drawing). The output end of the second-stage linear driver is fixed with a base 522. The first-stage linear driver is fixedly installed on the base 522. The base 522 is slidably connected to the frame 100 along the axial direction of the pipe (in this embodiment, the base 522 and the frame 100 realize relative sliding through a slider and rail design). The support seat 521 for installing the rotator 53 is slidably connected to the base 522 along the axial direction of the pipe. Therefore, the second-stage linear driver is used to drive the pipe to achieve a long-distance push, and the first-stage linear driver is used to achieve a short-distance approach or push of the pipe, so that the pipe feeder 52 can realize automatic pipe feeding for pipes with large length changes.

[0052] This embodiment provides an automatic peeling method for pipes, including the following steps: S1. Take a pipe and place it on the supporting roller 51: The lifting pipe remover 62 moves upward, and uses the top plate 621 to lift the pipe at the lowest end of the pipe placement plate 611 upward so that the pipe is transferred to the lowest end of the inclined surface of the top plate 621. Then, the lifting pipe remover 62 is controlled to move downward until the blocking part 6211 is lower than the guide surface 631 of the output plate 63. The pipe rolls down on the inclined guide surface 631 and falls directly onto the supporting roller 51.

[0053] S2. Rotate the pipe to the set position: The pipe feeder 52 controls the chuck 531 on the rotator 53 to approach the end face of the pipe until the claws of the chuck 531 surround the pipe. Then, the chuck 531 is controlled to clamp the pipe, and the rotator 53 is controlled to drive the pipe to rotate to the set position.

[0054] S3. Inserting the pipe onto the tractor 1: The chuck 531 releases its grip on the pipe, and the pipe feeder 52 is controlled to push the rotator 53 to move, so that the pipe gradually approaches the tractor 1 and is inserted into the tractor 1 under the push of the chuck 531 .

[0055] S4. Pipe peeling: The peeling knife 2 moves downward to press the pipe, while the support roller 3 pushes the pipe upward. Under the continuous traction of the traction machine 1, the peeling knife 2 continues to peel on the surface of the pipe until the peeling of a single pipe is completed, and then the peeling knife 2 is controlled to rise.

[0056] This embodiment achieves efficient, safe and thorough removal of inkjet coding markings on plastic pipes, while avoiding waste of pipe materials, improving recycling efficiency and ensuring the quality of recycled materials, and reducing production costs.

[0057] In this embodiment, when the pipe does not need to be peeled but is peeled, it is only necessary to ensure that the height position of the peeling knife 2 and the support roller 3 does not affect the transportation of the pipe, and the inkjet printer 20 and the traction machine 1 can be used to spray the code on the pipe, thereby taking into account the peeling function and the coding function on a set of automated equipment at the same time, greatly reducing the equipment cost.

[0058] Example 2 The second embodiment is further improved on the basis of the first embodiment, as follows: The supporting roller 3 is installed on the elevator, and the elevator is connected to the control system signal.

[0059] The control system includes a peeling mode and a coding mode. In the peeling mode, after the in-place sensor 10 senses the pipe, the control system controls the lifter 21 to drive the peeling knife 2 to move downward to a set height, and controls the elevator to drive the supporting roller 3 to rise to a set height, so that when peeling, the peeling knife 2 cuts into the pipe to a certain depth, and a section of the pipe between the peeling knife 2 and the supporting roller 3 is inclined, thus facilitating peeling. At this time, the peeling knife 2 always inserts into the pipe skin to a certain depth to ensure that the ink coding is completely peeled off.

[0060] In the coding mode, the control system controls the peeling knife 2 to always be at a height that does not affect the free movement of the pipe, and controls the elevator to drive the supporting roller 3 to move downward to a height that only supports the pipe. The control system is used to control the coder 20 to perform coding after the in-place sensor 10 senses the pipe.

[0061] This embodiment makes the switching between the peeling operation and the coding operation of the pipe simpler, faster, and with a higher degree of automation.

[0062] The above are only embodiments of the present invention. Specific technical solutions and / or common knowledge such as characteristics well known in the art are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be subject to the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. An automated peeling device for plastic pipes, including a tractor, characterized in that: It also includes a peeling knife, a supporting roller and a supporting groove. The peeling knife and the supporting roller are both located in the pulling direction of the tractor, and both the peeling knife and the supporting roller are located on the input side of the tractor. The distance between the peeling knife and the tractor is less than the distance between the supporting roller and the tractor. A supporting groove for supporting the pipe is provided between the supporting roller and the tractor. The peeling knife is located above the supporting groove. The supporting groove is V-shaped or arc-shaped. At least one of the peeling knife and the supporting roller can be lifted and lowered.

2. The automated peeling device for a plastic pipe according to claim 1, characterized in that: The peeling knife is fixed on the lifter, and the supporting roller can be adjusted in height.

3. The automated peeling device for plastic pipes according to claim 2, characterized in that: It also includes a position sensor arranged between the tractor and the peeling knife. The position sensor is connected to the control system. The control system is used to control the peeling knife to move downward after the position sensor senses the pipe, and the control system is used to control the peeling knife to move upward after the position sensor does not sense the pipe.

4. The automated peeling device for plastic pipes according to claim 3, wherein: It also includes an inkjet printer located between the tractor and the peeling knife.

5. The automated peeling device for a plastic pipe according to claim 4, wherein: The control system includes a peeling mode and an inkjet printing mode. In the peeling mode, after the position sensor senses the pipe, the control system controls the lifter to drive the peeling knife to move downward to a set height. In the inkjet printing mode, the control system controls the peeling knife to always be at a height that does not affect the free movement of the pipe. The control system is used to control the inkjet printer to perform inkjet printing after the position sensor senses the pipe.

6. An automatic peeling device for a plastic pipe according to any one of claims 1-5, characterized in that: It also includes a rotary pushing mechanism. The rotary pushing mechanism and the supporting groove are located on both sides of the conveying direction of the supporting roller. The rotary pushing mechanism includes a supporting component, a pipe feeder and a rotator. The supporting component includes a plurality of supporting rollers for supporting the pipe. The pipe feeder is used to insert the pipe on the supporting roller into the tractor. The rotator is used to drive the pipe to rotate to a set orientation.

7. An automatic peeling device for plastic pipes according to claim 6, characterized in that: The rotator includes a chuck, a rotary drive and a color mark sensor. The chuck is used to clamp the pipe. The chuck is installed at the output end of the rotary drive. The rotary drive is used to drive the chuck to rotate. The color mark sensor is used to sense the color change on the pipe. The color mark sensor is connected to the control system. The control system is used to control the rotary drive to stop rotating and control the chuck to release the pipe after the color mark sensor senses the set color.

8. An automatic peeling device for plastic pipes according to claim 7, characterized in that: The rotator is installed at the output end of the pipe feeder. The pipe feeder is used to drive the rotator to move along the axial direction of the pipe.

9. The automatic peeling device for a plastic pipe according to claim 7, characterized in that: It also includes an automatic feeding mechanism. The automatic feeding mechanism includes a support frame and a lifting pipe picker. The support frame is provided with an inclined pipe placing plate. A blocking rod is fixed on the side where the pipe placing plate inclines downward. The lifting pipe picker includes a lifting movement machine and a top plate fixed on the lifting movement machine. The top surface of the top plate has an inclined surface. The inclined surface inclines downward towards the supporting roller. Each time the top plate rises, it will lift the pipe closest to the blocking rod upward. The lifted pipe can move along the inclined surface towards the supporting roller.

10. The automated peeling device for plastic pipes according to claim 9, characterized in that: A blocking portion protruding upward is provided at the end of the inclined surface of the top plate facing downward. The automatic feeding mechanism also includes a fixed export plate. The export plate is provided with an inclined guiding surface and a limiting through groove immediately following the lower end of the guiding surface. The limiting through groove is directly opposite the supporting roller.

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