A PVC pipe traction device

Abstract

This utility model discloses a PVC pipe traction device, including a frame in which a traction mechanism, a drive mechanism, and a support mechanism installed in the traction direction to support the pulled pipe body are mounted. The traction mechanism includes two traction rollers arranged parallel to each other in the frame, namely a first traction roller located below and a second traction roller located above. The drive mechanism drives the first and second traction rollers to rotate towards each other, and both the first and second traction rollers are equipped with a pressurizing mechanism. The pressurizing mechanism includes cavities inside both ends of the roller body, and keyways on the surface of the roller body communicate with the cavities. A pressurizing airbag is installed in the cavity, and the interior of the pressurizing airbag is connected to the inflation port of the roller body through an inflation pipe in the roller body. Several raised keys are provided on the surface of the pressurizing airbag, and the raised keys protrude after the pressurizing airbag is inflated. This utility model solves the problem of insufficient contact friction of the traction roller in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of PVC pipe production and processing, and in particular to a PVC pipe traction device. Background Technology

[0002] PVC pipe, a rigid polyvinyl chloride material, is manufactured using polyvinyl chloride resin combined with various processing aids (such as heat stabilizers and lubricants) through a high-temperature extrusion molding process. This type of pipe was one of the earliest plastic pipes to achieve industrialized production. In subsequent processing, to ensure cutting accuracy and efficiency, specialized traction equipment is typically used to smoothly transport the pipe body to the cutting device for precise cutting.

[0003] There is a traction device in the prior art, for example, Chinese patent application number CN202421565989.6, which discloses a pipe traction device in a PVC pipe production line. It includes an operating table, with a mounting frame fixedly installed on the upper surface of the operating table. The mounting frame has through openings on both its left and right sides. A fixed box is installed inside the mounting frame, with its upper and lower ends fixedly connected to the inner top of the mounting frame and the upper surface of the operating table, respectively. A first screw is rotatably connected to the inner bottom of the fixed box via bearings. Two lifting blocks are threadedly connected to the outer surface of the first screw. During traction, the pipe is positioned between the two traction rollers, and the rotation of the two rollers moves the pipe forward. Simultaneously, the pipe is also positioned between two guide blocks in a guiding mechanism. These guide blocks limit the pipe's movement, preventing deviation and ensuring stability during traction, thus bringing many conveniences to PVC pipe processing.

[0004] However, existing technologies similar to the aforementioned patent have the following problems: there is no mechanism to increase the contact friction between the traction roller and the PVC pipe. When there are tolerances in the diameter of the PVC pipe, it cannot be guaranteed that the traction roller can consistently and stably pull the PVC pipe to one side. Therefore, it is necessary to design a PVC pipe traction device that can enhance the contact friction. Utility Model Content

[0005] To address the problem of insufficient contact friction of the traction roller in existing technologies, this utility model proposes a PVC pipe traction device, the technical solution of which is as follows:

[0006] A PVC pipe pulling device includes a frame, in which a pulling mechanism, a driving mechanism, and a support mechanism installed in the pulling direction are mounted to support the pulled PVC pipe.

[0007] The traction mechanism includes two traction rollers that are arranged in parallel rotation in the frame, including a first traction roller arranged below and a second traction roller arranged above. The driving mechanism drives the first traction roller and the second traction roller to rotate towards each other, and both the first traction roller and the second traction roller are provided with a pressure mechanism.

[0008] The pressurizing mechanism includes cavities inside both ends of the traction roller body, and keyways on the surface of the roller body communicating with the cavities. A pressurizing airbag is provided in the cavity, and the interior of the pressurizing airbag is connected to the inflation port of the roller body through an inflation pipe in the roller body. Several protruding keys are provided on the surface of the pressurizing airbag. After the pressurizing airbag is inflated, the protruding keys protrude from the keyways and protrude from the surface of the roller body.

[0009] Furthermore, a circumferential arc-shaped groove is provided in the middle of the roller body, which is recessed inward toward the axis of the roller body, and the keyway is symmetrically arranged on both sides of the arc-shaped groove.

[0010] Furthermore, the raised key is fixedly connected to the outer wall of the pressurized airbag, and the raised key protrudes from the top surface of the roller body and is provided with anti-slip horizontal lines, which are perpendicular to the traction direction of the traction roller.

[0011] Furthermore, a ring of anti-detachment flange extending outward parallel to the top surface of the raised key is provided on the outer periphery of the raised key, and the radial extension width of the anti-detachment flange is greater than the opening width of the key.

[0012] Furthermore, the pressurized airbag and the inner wall of the cavity are provided with two fixed connection points in the direction of the roller axis to prevent the airbag from shifting in the cavity. An air inlet is opened in the fixed connection point near the end of the roller. The air inlet is connected to the inflation pipeline and is connected to the air inlet at the fixed connection point near the end of the roller.

[0013] Furthermore, the top surface of the raised key is an arc surface that is recessed towards one side of the roller body, and the arc surface is parallel to the side wall of the arc-shaped groove.

[0014] Furthermore, the drive mechanism includes a geared motor disposed on one side of the frame. The output shaft of the geared motor passes through the frame and is coaxially fixedly connected to the first traction roller. The other side of the first traction roller is rotatably mounted on the inner wall of the frame. A first drive gear is coaxially fixed on the output shaft. One end of the second traction roller is rotatably mounted on the inner wall of the frame, and the other end passes through the frame and is coaxially fixed to the second drive gear on the outer side of the frame. The first drive gear and the second drive gear are coplanar and mesh with each other. The output shaft drives the first drive gear to rotate, thereby driving the second drive gear to rotate, so that the first traction roller and the second traction roller rotate towards each other.

[0015] Furthermore, the support mechanism includes a pair of limiting rollers vertically arranged in the traction direction via a bracket, and a support roller horizontally arranged between the limiting rollers via a bracket.

[0016] The beneficial effects of this utility model are as follows: This utility model effectively solves the problem of insufficient friction in traditional traction devices through innovative design of the pressurized airbag and traction roller structure. Its beneficial effects are reflected in: 1. The roller body adopts an internal cavity with an inflatable pressurized airbag and a retractable protruding key structure. After inflation, the protruding key protrudes from the roller surface to form multi-point contact. Combined with the anti-slip horizontal stripe and anti-detachment flange design, it significantly improves the contact friction coefficient with the pipe and ensures traction stability; 2. The arc-shaped groove in the middle of the roller body is parallel to the arc surface of the protruding key to form a contour clamping space, which can adapt to different pipe diameters and prevent pipe displacement; 3. The airbag's double fixed point connection combined with the end air inlet layout ensures uniform inflation and airbag position stability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0018] Figure 2 This is a schematic diagram of the traction roller of this utility model;

[0019] Figure 3 This is a schematic diagram of the support organization for this utility model.

[0020] In the above figures: frame 1, first traction roller 2, second traction roller 3, cavity 4, keyway 5, arc groove 6, pressurized airbag 7, raised key 8, anti-detachment flange 10, inflation port 11, inflation pipeline 12, fixed connection point 13, reduction motor 14, first drive gear 15, second drive gear 16, vertical limiting roller 17, horizontal support roller 18, bracket 19, air inlet 20. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] like Figure 1 , Figure 2 , Figure 3As shown, a PVC pipe traction device includes a frame 1, in which a traction mechanism, a drive mechanism, and a support mechanism installed in the traction direction are mounted to support the tracted PVC pipe. The traction mechanism includes two traction rollers arranged in parallel and rotating vertically in the frame 1, including a first traction roller 2 arranged below and a second traction roller 3 arranged above. The drive mechanism drives the first traction roller 2 and the second traction roller 3 to rotate towards each other, and both the first traction roller 2 and the second traction roller 3 are provided with a pressure mechanism. The pressurizing mechanism includes cavities 4 inside both ends of the traction roller body, and keyways 5 on the surface of the roller body communicating with the cavities 4. A pressurizing airbag 7 is provided in the cavity 4. The interior of the pressurizing airbag 7 is connected to the inflation port 11 opened in the roller body through an inflation pipe 12 in the roller body. Several raised keys 8 are provided on the surface of the pressurizing airbag 7. After the pressurizing airbag 7 is inflated, the raised keys 8 protrude from the keyways 5 and protrude from the surface of the roller body, forming multi-point contact, which significantly increases the contact area and friction with the PVC pipe, avoiding the slippage problem of traditional smooth roller surfaces.

[0023] like Figure 1 , Figure 2 As shown, preferably, the roller body has a circumferential arc-shaped groove 6 recessed inward towards the roller body axis in the middle part, and the key 5 is symmetrically arranged on both sides of the arc-shaped groove 6. The arc-shaped groove 6 and the arc surface of the raised key 8 are designed to be parallel to form a contour clamping space that fits against the outer wall of the pipe, which can adapt to PVC pipes of different diameters and prevent the pipe from shifting laterally during the traction process.

[0024] like Figure 1 , Figure 2 As shown, preferably, the raised key 8 is fixedly connected to the outer wall of the pressurized airbag 7, and the raised key 8 protrudes from the top surface of the roller body and is provided with anti-slip horizontal lines. The anti-slip horizontal lines are perpendicular to the traction direction of the traction roller, increasing the micro-friction resistance with the surface of the pipe and further improving the traction stability.

[0025] like Figure 1 , Figure 2 As shown, preferably, the outer periphery of the top surface of the raised key 8 is provided with a ring of anti-detachment flange 10 extending outward parallel to the top surface of the raised key 8. The radial extension width of the anti-detachment flange 10 is greater than the opening width of the key opening 5, so as to prevent the raised key 8 from retracting and getting stuck in the key opening 5 or falling off when the pressurized airbag 7 deflates, thus extending its service life.

[0026] like Figure 1 , Figure 2As shown, preferably, the pressurized airbag 7 and the inner wall of the cavity 4 are provided with two fixed connection points 13 along the roller axis to prevent the airbag from shifting within the cavity 4. An air inlet 20 is provided at the fixed connection point 13 near the end of the roller. The inflation port 11 is connected to the inflation pipeline 12 and is connected to the air inlet 20 at the fixed connection point 13 near the end of the roller. The airbag is stabilized within the cavity 4 through the two fixed points, preventing uneven pressure distribution caused by airbag shifting during inflation. The end air inlet 20 is directly connected to the inflation pipeline 12 to ensure inflation efficiency and uniform airbag expansion. Preferably, the pressurized airbag 7 is made of rubber, and the fixed connection points 13 of the pressurized airbag 7 are partially hardened for fixation. Further material selection for the rubber of the pressurized airbag 7 and the partial hardening for fixation are already well-established in the prior art and will not be elaborated here.

[0027] It should also be noted that the inflation port 11 adopts a one-way inflation valve, and the one-way inflation valve can realize the deflation function. This component has been widely used in industrial production, so it will not be described in detail here, nor is it specially marked in the figure.

[0028] like Figure 1 , Figure 2 As shown, preferably, the top surface of the raised key 8 is an arc surface that is recessed towards one side of the roller body and the arc surface is parallel to the side wall of the arc groove 6, so that the pressure distribution is uniform when the raised key 8 contacts the tube, reducing local wear and enhancing the clamping fit.

[0029] like Figure 1 , Figure 2 As shown, preferably, the drive mechanism includes a geared motor 14 disposed on one side of the frame 1. The output shaft of the geared motor 14 passes through the frame 1 and is coaxially fixedly connected to the first traction roller 2. The other side of the first traction roller 2 is rotatably mounted on the inner wall of the frame 1. A first drive gear 15 is coaxially fixed on the output shaft. One end of the second traction roller 3 is rotatably mounted on the inner wall of the frame 1, and the other end passes through the frame 1 and is coaxially fixed to the second drive gear 16 on the outer side of the frame 1. The first drive gear 15 and the second drive gear 16 are coplanar and mesh with each other. The output shaft drives the first drive gear 15 to rotate, thereby driving the second drive gear 16 to rotate, so that the first traction roller 2 and the second traction roller 3 rotate in opposite directions. The geared motor 14, through the meshing of the first drive gear 15 and the second drive gear 16, achieves precise synchronous rotation of the upper and lower traction rollers in opposite directions, ensuring consistent traction speed and avoiding pipe twisting caused by speed differences. It should be noted that the use and installation conditions of the geared motor 14 are common knowledge, so they will not be described in detail in this embodiment. The geared motor 14 is an integration of a reducer and a motor.

[0030] like Figure 3As shown, preferably, the support mechanism includes a pair of vertically arranged limiting rollers in the traction direction via a bracket 19, and a support roller horizontally arranged between the limiting rollers via a bracket 19. The vertical limiting roller 17 and the horizontal support roller 18 form a three-point positioning to limit the lateral swing and vertical jump of the pipe in the traction direction, thereby ensuring the accuracy of linear traction.

[0031] The method and principle of this utility model are as follows: The device clamps the PVC pipe by synchronously rotating the upper and lower traction rollers in opposite directions. Before use, the internal pressure bladder 7 of the roller body is inflated, causing the raised key 8 to protrude from the roller surface and form multi-point high-friction contact. The arc-shaped groove 6 and the arc-shaped design of the raised key 8 enhance the clamping fit, while the anti-slip horizontal stripes and anti-detachment flange 10 further ensure frictional stability. The drive gear meshing system ensures the synchronization of the two rollers, and the three-roller layout of the support mechanism limits the pipe offset, achieving efficient and stable linear traction. The method of use is as follows: place the PVC pipe between the upper and lower traction rollers, start the reduction motor 14 to drive the two rollers to rotate in opposite directions; inflate the pressure bladder 7 through the air inlet 11, so that the protruding key 8 protrudes from the roller surface and fits against the pipe surface; adjust the pressure of the air bladder to adapt to different pipe diameters and traction speed requirements; during the pipe traction process, the limiting roller and the supporting roller of the support mechanism automatically correct their movement trajectory to ensure straight output. This device, through dynamic pressure adjustment and contour clamping design, takes into account both friction self-adaptive enhancement and pipe protection, and is suitable for the efficient production of PVC pipes of various specifications.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A PVC pipe traction device, characterized in that: Includes a frame (1), in which a traction mechanism, a drive mechanism, and a support mechanism installed in the traction direction are installed to support the tracted PVC pipe; The traction mechanism includes two traction rollers that are arranged in parallel rotation in the frame (1), including a first traction roller (2) arranged below and a second traction roller (3) arranged above. The driving mechanism drives the first traction roller (2) and the second traction roller (3) to rotate towards each other, and both the first traction roller (2) and the second traction roller (3) are provided with a pressure mechanism. The pressurizing mechanism includes cavities (4) inside both ends of the traction roller body, and keyways (5) on the surface of the roller body are connected to the cavities (4). A pressurizing airbag (7) is provided in the cavity (4). The interior of the pressurizing airbag (7) is connected to the inflation port (11) opened in the roller body through an inflation pipe (12) in the roller body. Several protruding keys (8) are provided on the surface of the pressurizing airbag (7). After the pressurizing airbag (7) is inflated, the protruding keys (8) protrude from the keyways (5) and protrude from the surface of the roller body.

2. The PVC pipe traction device according to claim 1, characterized in that: The roller body has a circumferential arc-shaped groove (6) recessed into the roller body axis in the middle, and the keyway (5) is symmetrically arranged on both sides of the arc-shaped groove (6).

3. The PVC pipe traction device according to claim 1, characterized in that: The raised key (8) is fixedly connected to the outer wall of the pressurized airbag (7), and the raised key (8) protrudes from the top surface of the roller body and is provided with anti-slip horizontal lines, which are perpendicular to the traction direction of the traction roller.

4. A PVC pipe traction device according to claim 3, characterized in that: The outer periphery of the top surface of the raised key (8) is provided with a ring of anti-detachment flange (10) extending outward parallel to the top surface of the raised key (8), and the radial extension width of the anti-detachment flange (10) is greater than the opening width of the key mouth (5).

5. A PVC pipe traction device according to claim 1, characterized in that: The pressurized airbag (7) and the inner wall of the cavity (4) are provided with two fixed connection points (13) in the direction of the roller axis to prevent the airbag from shifting in the cavity (4). An air inlet (20) is provided in the fixed connection point (13) near the end of the roller. The inflation port (11) is connected to the inflation pipeline (12) and is connected to the air inlet (20) at the fixed connection point (13) near the end of the roller.

6. A PVC pipe traction device according to claim 2, characterized in that: The top surface of the raised key (8) is an arc surface that is recessed to one side of the roller body and the arc surface is parallel to the side wall of the arc groove (6).

7. A PVC pipe traction device according to claim 1, characterized in that: The drive mechanism includes a geared motor (14) disposed on one side of the frame (1). The output shaft of the geared motor (14) passes through the frame (1) and is coaxially fixedly connected to the first traction roller (2). The other side of the first traction roller (2) is rotatably mounted on the inner wall of the frame (1). A first drive gear (15) is coaxially fixed on the output shaft. One end of the second traction roller (3) is rotatably mounted on the inner wall of the frame (1), and the other end passes through the frame (1) and is coaxially fixed to the second drive gear (16) on the outer side of the frame (1). The first drive gear (15) and the second drive gear (16) are coplanar and mesh with each other. The output shaft drives the first drive gear (15) to rotate, thereby driving the second drive gear (16) to rotate, so that the first traction roller (2) and the second traction roller (3) rotate towards each other.

8. A PVC pipe traction device according to claim 1, characterized in that: The support mechanism includes a pair of limiting rollers vertically arranged in the traction direction via a bracket (19), and a support roller horizontally arranged between the limiting rollers via a bracket (19).

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