Cutting device for PVC pipes

Abstract

The application relates to the technical field of pipe cutting, and particularly discloses a dust-free cutting device for PVC pipe production, which comprises a bottom box seat, a pipe bracket is arranged on the upper surface of the bottom box seat, a cutting mechanism is arranged on the bottom box seat at one side end of the pipe bracket, a fixed pressing frame is arranged above the pipe bracket on the side close to the cutting mechanism; the cutting mechanism comprises a mounting seat, an outer ring body is fixedly arranged in the mounting seat, an inner ring body is rotationally arranged in the inner ring of the outer ring body, a ring cutting rotating cylinder is rotationally arranged in the inner ring of the inner ring body, and a radial knife shaft rod is inserted in the ring cutting rotating cylinder; the application changes the traditional mode of cutting the pipe by using a high-speed cutting wheel, the whole cutting process does not generate any chippings, the pipe end surface after cutting is free of any burrs, the cutting quality of the pipe is guaranteed, the process of burr polishing required subsequently is omitted, the structural design is novel, and the cutting effect on the PVC pipe is excellent.

Description

Technical Field

[0001] This invention relates to the field of pipe cutting technology, and specifically discloses a dust-free cutting device for PVC pipe production. Background Technology

[0002] In the production of PVC pipes, the pipes need to be cut to a fixed length according to customer requirements before packaging and transportation. Currently, PVC pipes are mainly cut using a cutting machine, which uses a high-speed rotating cutting wheel to cut the pipe. However, cutting PVC with a cutting machine not only generates a large amount of debris, but also leaves a lot of burrs on the end face of the cut pipe, requiring secondary processing to remove the burrs.

[0003] For example, utility model patent application number 2022213118849 discloses a PVC pipe cutting device, including a cutting table and a cutting machine body located above the cutting table and supported by a support plate; it also includes clamping components symmetrically installed on the surface of the cutting table, the clamping components including a clamping frame, a fixed arc plate, a movable arc plate, a screw, and an adjusting part, with the fixed arc plate fixedly installed inside the clamping frame. The PVC pipe cutting device disclosed in this patent is a common cutting machine on the market, except that clamping components are set at both ends of the cutting machine to fix the pipe and ensure the cutting stability of the pipe. However, this cutting device still cannot avoid the problem of a large amount of debris when the high-speed cutting wheel acts on the pipe, and a large number of burrs on the cut end face. Based on the technical problems existing in the cutting machine used for PVC pipe cutting, this application proposes a cutting device that can perform dust-free cutting of PVC pipes and cut off the end face without burrs. Summary of the Invention

[0004] The present invention aims to provide a PVC pipe cutting device to solve the problems of generating a large amount of debris and having a large number of burrs on the end face of the cut pipe during the pipe cutting process of existing cutting machine-type PVC pipe cutting devices.

[0005] This invention is achieved through the following technical solution:

[0006] A PVC pipe cutting device includes a base box, a pipe support is provided on the upper surface of the base box, a cutting mechanism is provided on the base box located at one end of the pipe support, and a fixing frame is provided directly above the pipe support near the cutting mechanism.

[0007] The cutting mechanism includes a mounting base, in which an outer ring body is fixedly mounted. An inner ring body is rotatably mounted within the inner ring body. The mounting base is provided with a first driving component for rotating the inner ring body and a locking component for fixing the inner ring body. A guide rail is provided in the middle of the inner ring wall of the inner ring body. The guide rail is composed of an arc segment and an outer concave segment. A circumferential cutting cylinder is rotatably mounted within the inner ring body. A radially arranged cutter shaft is inserted into the circumferential cutting cylinder. The outer end of the cutter shaft is connected to a pressure wheel that abuts against the guide rail. A spring is connected between the pressure wheel and the outer wall of the inner ring body. The inner end of the cutter shaft is connected to a blade assembly that extends into the circumferential cutting cylinder. The mounting base is provided with a second driving component for rotating the circumferential cutting cylinder.

[0008] The PVC pipe cutting device disclosed in this invention changes the existing method of cutting pipes by high-speed cutting wheels. During the PVC pipe cutting process, the PVC pipe is passed concentrically through the ring cutting drum and fixed. Then, the second drive component is activated to make the ring cutting drum rotate at low speed. During the rotation of the ring cutting drum, the pressure wheel, the cutter shaft rod and the pressure wheel will rotate synchronously. At this time, the inner ring body is locked and fixed by the locking component.

[0009] As the pressure roller rotates, it is guided by the guide rail, which forces the blade assembly, which was originally retracted and close to the inner ring body, to be forcibly inserted into the PVC pipe. Then, as the circumcision drum continues to rotate, the blade assembly will circumcise the PVC pipe.

[0010] When the pressure roller rotates to approach the outer concave section again, the locking component is first released from the locking state of the inner ring body, and then the first drive component is activated to make the inner ring body and the circumcision drum rotate in the same direction by 10~20°. This ensures that the blade assembly can rotate completely 360° after being inserted into the PVC pipe before entering the outer concave section position to achieve blade retraction, thereby achieving effective 360° circumcision of the PVC pipe. Furthermore, the entire circumcision process will not generate any debris or dust, and there will be no burrs on the end face after circumcision.

[0011] As a further provision of the above scheme, a ring channel is opened in the middle of the inner ring wall of the outer ring body, and two openings connected to the ring channel are opened on the outer ring body. Ring teeth extending into the ring channel are provided on the outer circular surface of the inner ring body. The first drive component includes a first motor fixedly installed, and a first gear extending into the opening and meshing with the ring teeth is provided on the first motor.

[0012] As a further feature of the above solution, the locking component includes a first power telescopic member that is fixedly mounted, and a toothed block that extends into the through-hole and engages with the ring teeth is connected to the first power telescopic member.

[0013] As a further provision of the above scheme, the second drive component includes a fixedly mounted second motor, on which a second gear is mounted, and at the end of the circumferential rotating drum extending out of the inner ring body, a gear ring is mounted that meshes with the second gear.

[0014] As a further feature of the above scheme, the arc segment sector angle of the guide rail is set at 340~350°, and the concave segment sector angle of the guide rail is set at 10~20°.

[0015] As a further provision of the above solution, the blade assembly includes a blade holder connected to the inner end of the blade shaft, and the blade is detachably mounted in the blade holder.

[0016] As a further feature of the above solution, the pipe support includes a lifting plate, and a row of first positioning members arranged along the length of the PVC pipe is provided on the upper surface of the lifting plate. The fixed pressure frame includes a bracket fixed on the base box, and a third power telescopic member is provided at the upper end of the bracket. The lower end of the third power telescopic member is connected to a second positioning member through a pressure plate.

[0017] As a further provision of the above solution, a storage groove is provided on the upper surface of the base box, and a second power telescopic component is provided at one end of the storage groove. A fork-type telescopic frame connected to the second power telescopic component is provided in the storage groove, and the lifting plate is connected to the upper end of the fork-type telescopic frame.

[0018] The present invention, through the above-mentioned design of the pipe bracket and the fixing frame, enables the pipe bracket to automatically unload and connect with the pipe feeding mechanism during the feeding process, which facilitates the feeding of PVC pipes. Then, the PVC pipes are pushed upwards to align with the cutting mechanism. After alignment, the pipes are pushed and pressed and fixed by the fixing frame to prevent loosening during the subsequent cutting process and ensure the cutting quality.

[0019] As a further feature of the above solution, a pipe pushing mechanism is provided on the base. This mechanism includes a strip frame fixed directly above the pipe support, on which parallel slide rails and a lead screw are mounted. One end of the lead screw is connected to a lead screw motor, and a slider is mounted on the slide rails. The lower end of the slider is connected to a lead screw nut that matches the lead screw, and the lower end of the lead screw nut is connected to a pushing component that acts on the end face of the PVC pipe. This pipe pushing mechanism achieves precise control of the PVC pipe's length cutting by controlling the number of rotations of the lead screw motor.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] The PVC pipe cutting device disclosed in this invention changes the traditional method of cutting pipes using high-speed cutting wheels. It uses a blade to forcefully insert into the pipe and then rotates to cut it. The entire cutting process does not produce any debris, and the cut pipe end face is free of any burrs, ensuring the cutting quality of the pipe and eliminating the need for subsequent burr grinding. Its novel structural design provides excellent cutting effect for PVC pipes.

[0022] The present invention further improves the design of components such as pipe brackets, fixed pressure frames, and material pushing mechanisms, which not only facilitates material feeding during the operation of the entire device, but also enables automatic adjustment of the pipe cutting length to ensure the accuracy of the cutting length. At the same time, the clamping action of the fixed pressure frame ensures the stability of the pipe during the cutting process, thereby improving the cutting effect of the pipe. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention from a first angle;

[0025] Figure 2 This is a three-dimensional structural diagram of the cutting mechanism in this invention;

[0026] Figure 3 This is a schematic diagram of the three-dimensional assembly structure of the cutting mechanism in this invention;

[0027] Figure 4 This is a cross-sectional internal structure diagram of the cutting mechanism in this invention;

[0028] Figure 5 This is a three-dimensional structural diagram of the second cylinder, the fork-type lifting frame, and the pipe bracket in this invention;

[0029] Figure 6 For the present invention Figure 1 Enlarged structural diagram at point A;

[0030] Figure 7 This is a three-dimensional structural diagram of the tube pushing mechanism in this invention. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-7 This application will be described in detail with reference to the embodiments. Example 1

[0033] Example 1 discloses a PVC pipe cutting device, see attached drawing. Figure 1 It includes a base box 1 and a power distribution control box 2, with the power distribution control box 2 located on the front side of the base box 1. A pipe bracket 3 is provided on the upper surface of the base box 1, and a fixing frame 4 is provided directly above the right end of the pipe bracket 3, so that the PVC pipe can be pressed and fixed under the action of the fixing frame 4 and the pipe bracket 3 during the cutting process.

[0034] Reference Appendix Figure 2 Appendix Figure 3 and attached Figure 4 A cutting mechanism 5 is provided on the upper surface of the base box 1 on the right side of the pipe bracket 3. Specifically, the cutting mechanism 5 includes a mounting base 501 fixedly mounted on the upper surface of the base box 1. The upper end of the mounting base 501 has a semi-circular opening, and an outer ring body 502 is fixedly welded into the semi-circular opening. An outwardly recessed annular channel 5021 is provided at the middle position of the inner ring wall of the outer ring body 502. At both the front and rear ends of the outer ring body 502, there are openings 5022 that communicate with the annular channel 5021.

[0035] An inner ring body 503 is rotatably fitted within the inner ring of the outer ring body 502. Ring teeth 504 located in the ring track 5021 are provided on the outer circular surface of the inner ring body 503. A first motor 505 is fixed to the upper rear end of the mounting base 501. A first gear 506 is provided on the motor shaft of the first motor 505, and the first gear 506 meshes with the ring teeth 504 through a rear opening 5022. Under the transmission action of the first motor 505 and the gear, the inner ring body 503 can rotate a certain angle within the outer ring body 502 according to a set program. A first cylinder 507 is fixed at the upper front end of the mounting base 501. Of course, the first cylinder 507 can also be replaced by a power telescopic component such as a hydraulic cylinder or an electric cylinder. A toothed block 508 is connected to the end of the first cylinder 507, so that the toothed block 508 can engage with the ring tooth 504 through the front through-hole 5022, so that the inner ring body 503 can be locked under the engaging action of the toothed block 508 after the inner ring body 503 has rotated.

[0036] A guide rail 509 with an outward concave shape is provided in the middle of the inner ring wall of the inner ring body 503. The guide rail 509 includes an arc segment 5091 arranged concentrically with the inner ring body 503 and an outer concave segment 5092 connecting the two ends of the arc segment 5091. Generally, the sector angle of the arc segment 5091 is set between 340° and 350°, and the sector angle of the outer concave segment 5092 is set between 10° and 20°.

[0037] A circumferential cutting drum 510 is rotatably mounted within the inner ring of the inner ring body 503. A pressure roller 511 is positioned between the outer surface of the circumferential cutting drum 510 and the guide rail 509. A cutter shaft 512, extending radially into the inner ring of the circumferential cutting drum 510, is connected to the pressure roller 511. A spring 513 is fitted onto the outer end of the cutter shaft 512, and both ends of the spring 513 are connected to the pressure roller 511 and the outer surface of the circumferential cutting drum 510, respectively. A cutter head seat 514 is connected to the end of the cutter shaft 512 extending into the inner ring of the circumferential cutting drum 510. A blade 515, oriented towards the central axis of the circumferential cutting drum 510, is detachably mounted in the cutter head seat 514 via screws, bolts, or other connecting components. A gear ring 516 is welded to one end of the circumferential cutting drum 510 extending from the inner ring body 503. A second motor 517 is then mounted on the mounting base 501, and a second gear 518 is mounted on the motor shaft of the second motor 517, meshing with the gear ring 516. Furthermore, to prevent the first gear 506 and the second gear 518 from being affected by the external environment during transmission, a corresponding gear cover (not shown in the figure) can be provided on the outside of both the first gear 506 and the second gear 518.

[0038] In this embodiment, the cutting mechanism 5 first extends the PVC pipe concentrically into the circumferential cutting drum 510 during operation. Then, it is axially pushed according to the required cutting length of the PVC pipe, and then the PVC pipe is pressed and fixed. Next, the second motor 517 is started, so that under the meshing transmission of the second gear 518 and the gear ring 516, the circumferential cutting drum 510 slowly rotates 370~380° in the inner ring body 503. The specific rotation angle is determined by the structure of the guide rail 509. During the rotation of the circumferential cutting drum 510, it drives the pressure roller 511, the cutter shaft rod 512, and the blade 515 to rotate synchronously. This causes the pressure roller 511 to rotate out of the outer concave section 5092 and abut against the arc section 5091, thereby causing the cutter shaft rod 512 to move radially inward and forcibly insert the blade 515 into the PVC pipe. Then, during the subsequent rotation, the blade 515 rotates and circumferentially cuts the PVC pipe.

[0039] In addition, when the pressure roller 511 rotates to approach the outer concave section 5092 again, the first cylinder 507 is first controlled to retract to release the locking state of the inner ring body 503, and then the first motor 505 is started, so that the inner ring body 503 and the ring cutting drum 510 rotate in the same direction by 10~20° under the transmission of the first gear 506 and the ring tooth 504. This ensures that after the blade 515 is inserted into the PVC pipe, it can rotate 360° completely before entering the position of the outer concave section 5092 to realize the retraction of the blade 515, thereby achieving effective 360° ring cutting of the PVC pipe. Furthermore, the entire ring cutting process is free of debris and dust, and the end face after ring cutting is free of burrs. Example 2

[0040] Example 2 discloses a PVC pipe cutting device optimized based on the technical solution in Example 1. The similarities between it and Example 1 will not be described again.

[0041] Reference Appendix Figure 1 and attached Figure 5 In this embodiment 2, a storage groove 101 is provided on the upper surface of the base 1. A second cylinder 6 is provided at one end of the storage groove 101. The second cylinder 6 can also be replaced by a power telescopic component such as a hydraulic cylinder or an electric cylinder. A fork-type lifting frame 7 connected to the second cylinder 6 is provided in the storage groove 101, and then the pipe bracket 3 is connected to the upper end of the fork-type lifting frame 7.

[0042] The specific pipe support 3 includes a lifting plate 301 connected to the forklift lifting frame 7. Multiple V-shaped first positioning members 302 are spaced apart along the length of the PVC pipe on the upper surface of the lifting plate 301, with one end of each first positioning member 302 extending outwards. When the forklift lifting frame 7 moves the entire pipe support 3 downwards until it is flush with the upper surface of the base 1, the outwardly extending end of the first positioning member 302 is aligned with the conveyor used to transport the PVC pipe, thus facilitating the pushing of the PVC pipe 100 into the first positioning member 302 for positioning.

[0043] Reference Appendix Figure 7 In this embodiment 2, the fixed pressure frame 4 includes a bracket 401 fixed to the right end of the upper surface of the base box 1. A third cylinder 402 is provided at the upper end of the bracket 401, and a pressure plate 403 is connected to the lower end of the third cylinder 402. A V-shaped second positioning member 404 is provided on the lower surface of the pressure plate 403. When the fork-type lifting frame 7 lifts the pipe support 3 until the PVC pipe 100 is concentrically aligned with the circumferential cutting drum 510, the third cylinder 402 is then activated to push the pressure plate 403 downward, so that the upper and lower ends of the right side of the PVC pipe 100 are clamped and fixed by the second positioning member 404 and the first positioning member 302 respectively, ensuring the stability of the PVC pipe 100 during the subsequent circumferential cutting process.

[0044] Finally, in this embodiment 2, a pipe pushing mechanism 8 is also provided on the base box 1. For details of the pipe pushing mechanism 8, please refer to the attached document. Figure 7 The device includes a strip frame 801 fixedly mounted above the pipe support 3. A slide rail 802 is mounted on the top wall of the strip frame 801. A lead screw 803 is rotatably mounted in the strip frame 801 below the slide rail 802, and a lead screw motor 804 is connected to the left end of the lead screw 803. A matching slider is mounted on the slide rail 802, and a lead screw nut 805 matching the lead screw 803 is connected to the lower end of the slider. Finally, a pusher 806 acting on the left end face of the PVC pipe is connected to the lower end of the lead screw nut 805. This pipe pushing mechanism 8 can be programmed according to the customer's requirements for the length of the PVC pipe, so that the pusher 806 moves at a fixed distance under the transmission action of the lead screw 803 and the lead screw nut 805, achieving the effect of fixed-length cutting.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A PVC pipe cutting device, comprising a base box, characterized in that, The upper surface of the base box is provided with a pipe bracket, and a cutting mechanism is provided on the base box located at one end of the pipe bracket. A fixing pressure frame is provided directly above the pipe bracket on the side close to the cutting mechanism. The cutting mechanism includes a mounting base, in which an outer ring body is fixedly mounted. An inner ring body is rotatably mounted within the inner ring body. The mounting base is provided with a first driving component for rotating the inner ring body and a locking component for fixing the inner ring body. A guide rail is provided in the middle of the inner ring wall of the inner ring body. The guide rail is composed of an arc segment and an outer concave segment. A circumferential cutting cylinder is rotatably mounted within the inner ring body. A radially arranged cutter shaft is inserted into the circumferential cutting cylinder. The outer end of the cutter shaft is connected to a pressure wheel that abuts against the guide rail. A spring is connected between the pressure wheel and the outer wall of the inner ring body. The inner end of the cutter shaft is connected to a blade assembly that extends into the circumferential cutting cylinder. The mounting base is provided with a second driving component for rotating the circumferential cutting cylinder.

2. The PVC pipe cutting device according to claim 1, characterized in that, The outer ring body has a ring channel in the middle of the inner ring wall, and the outer ring body has two openings that communicate with the ring channel. The outer circular surface of the inner ring body is provided with ring teeth that extend into the ring channel. The first drive assembly includes a fixedly installed first motor, and the first motor is provided with a first gear that extends into the opening and meshes with the ring teeth.

3. The PVC pipe cutting device according to claim 2, characterized in that, The locking assembly includes a first power telescopic member that is fixedly installed, and a toothed block that extends into the through-hole and engages with the ring teeth is connected to the first power telescopic member.

4. The PVC pipe cutting device according to claim 1, characterized in that, The second drive assembly includes a fixedly mounted second motor, on which a second gear is mounted, and at the end of the circumferential rotating drum extending out of the inner ring body, a gear ring is mounted that meshes with the second gear.

5. The PVC pipe cutting device according to claim 1, characterized in that, The arc segment of the guide rail has a sector angle of 340~350°, and the concave segment of the guide rail has a sector angle of 10~20°.

6. The PVC pipe cutting device according to claim 1, characterized in that, The blade assembly includes a blade holder connected to the inner end of the blade shaft, and the blade is detachably mounted in the blade holder.

7. The PVC pipe cutting device according to claim 1, characterized in that, The pipe support includes a lifting plate, and a row of first positioning members arranged along the length of the PVC pipe is provided on the upper surface of the lifting plate. The fixed pressure frame includes a bracket fixed on the base box, and a third power telescopic member is provided at the upper end of the bracket. The lower end of the third power telescopic member is connected to a second positioning member through a pressure plate.

8. The PVC pipe cutting device according to claim 7, characterized in that, The upper surface of the base box is provided with a storage groove, and a second power telescopic component is provided at one end of the storage groove. A fork-type telescopic frame connected to the second power telescopic component is provided in the storage groove, and the lifting plate is connected to the upper end of the fork-type telescopic frame.

9. The PVC pipe cutting device according to claim 1, characterized in that, The base is equipped with a pipe pushing mechanism, which includes a strip frame fixed directly above the pipe bracket. The strip frame is equipped with parallel slide rails and a lead screw. One end of the lead screw is connected to a lead screw motor. A slider is provided on the slide rail. The lower end of the slider is connected to a lead screw nut that matches the lead screw. The lower end of the lead screw nut is connected to a pushing component that acts on the end face of the PVC pipe.

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