Pressing device for plastic pipe cutting

Abstract

The utility model provides a hold-down device for cutting plastic pipes, which belongs to the technical field of pipe fittings and comprises a vertical frame, a pair of hold-down rollers and a distance adjusting piece, the pair of hold-down rollers are rotatably arranged on the vertical frame in the vertical direction, a pipe clamping channel is reserved between the pair of hold-down rollers, and the distance adjusting piece is arranged between the pair of hold-down rollers. The pressing rollers are arranged on the vertical frame, arc-shaped concave faces are arranged on the roller faces of the pressing rollers, flexible sleeves are arranged on the pressing rollers, the arc-shaped concave faces are sleeved with the flexible sleeves, the flexible sleeves are attached to the arc-shaped concave faces, and the distance adjusting pieces are arranged on the vertical frame, connected with the pressing rollers and used for adjusting the distance between the pair of pressing rollers. Due to the fact that the flexible sleeve is soft and rich in elasticity, deep indentations can be effectively prevented from being generated on the contact surface of the plastic pipe in the pipe pressing process, meanwhile, the friction force between the flexible sleeve and the contact surface of the plastic pipe can be increased, and the pipe can be prevented from deviating.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipe fittings, and particularly relates to a clamping device for cutting plastic pipes. Background Art

[0002] Plastic pipes mainly include UPVC drainage pipes, UPVC water pipes, aluminum-plastic composite pipes, polyethylene (PE) water pipes, polypropylene PPR hot water pipes, etc., which have the advantages of small water flow loss, energy saving, material saving, ecological protection, and convenient completion. During the manufacturing process of some plastic pipes, a layer of paint-like material (hereinafter referred to as the coating layer) will be applied to the outermost layer of the plastic pipe. The coating layer is mainly coated with back-coated adhesive, reinforced extrusion, and paint on the outer wall of the plastic pipe in sequence. The coating layer has the function of enhancing the heat resistance, toughness, and ductility of the plastic pipe.

[0003] During the cutting process of plastic pipes, the plastic pipes need to be limited and clamped, and the clamping device contacts and squeezes the outer surface of the plastic pipes. However, some plastic pipes have a coating layer on the outer surface, which is relatively soft. If the squeezing force of the clamping device is too large, the contact surface of the plastic pipe after squeezing by the clamping device will have a deeper indentation. If the squeezing force of the clamping device is small, the plastic pipes will shake or even deviate during the cutting process, resulting in an uneven cutting surface. Utility Model Content

[0004] Based on this, the utility model provides a clamping device for cutting plastic pipes to solve the technical problems existing in the prior art: if the squeezing force of the clamping device is too large, a deeper indentation will be produced on the contact surface of the plastic pipe after squeezing by the clamping device; if the squeezing force of the clamping device is small, the plastic pipe will shake or even deviate during the cutting process of the plastic pipe, resulting in an uneven cutting surface.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] A clamping device for cutting plastic pipes comprises a stand, a pair of clamping rollers and a distance adjusting member. The pair of clamping rollers are rotatably arranged on the stand in the vertical direction. A pipe clamping channel is reserved between the pair of clamping rollers. The roller surfaces of the clamping rollers are provided with an arcuate concave surface. The clamping rollers are provided with a flexible sleeve, which is arranged on the arcuate concave surface and fits the arcuate concave surface. The distance adjusting member is arranged on the stand and connected to the clamping rollers for adjusting the distance between the pair of clamping rollers.

[0007] Preferably, the stand comprises a base plate and a pair of vertical plates, the pair of vertical plates are arranged parallel to the base plate, the clamping roller is located between the pair of vertical plates, a through slot is provided on the vertical plate, the distance adjusting member passes through the through slot and is connected to the clamping roller, and scale lines are provided in the through slot.

[0008] Preferably, the distance adjusting member includes a lifting push rod and a connecting shaft, the lifting push rod is fixed to the side wall of the vertical plate, the first end of the connecting shaft is connected to the end of the lifting push rod, and the second end of the connecting shaft passes through the through slot and is connected to the clamping roller.

[0009] Preferably, the clamping roller includes a main shaft, a bearing, an annular side plate and an elastic plate. The end of the main shaft is connected to the distance adjusting member, the bearing is sleeved on the main shaft, the annular side plate is sleeved on the outer ring of the bearing and is limited. A limiting groove is provided on the annular side plate. The elastic plate is clamped in the limiting groove and is extruded and bent to form the arc-shaped concave surface.

[0010] Preferably, the clamping roller further comprises a limit tension spring, a first end of which is fixedly disposed on the surface of the outer ring of the bearing, and a second end of which is connected to the lowest point of the bending portion of the elastic plate.

[0011] Preferably, a plurality of top columns are provided on the annular side plate, one end of the top column is located outside the annular side plate, and the other end passes through the annular side plate and extends into the limiting groove to be connected to the elastic plate.

[0012] Preferably, the top column includes a threaded barrel and a stud, the threaded barrel is fixedly arranged on the annular side plate, the stud is sleeved with the threaded barrel, one end of the stud extends into the limiting groove and is connected to the elastic plate.

[0013] Compared with the prior art, the utility model has at least the following advantages:

[0014] (1) It is suitable for clamping plastic pipes of different diameters; the pipe clamping channel between the pair of clamping rollers is adjusted by the distance adjusting member to clamp plastic pipes of different diameters and put them in a clamped state.

[0015] (2) Preventing the pipe from shifting; the roller surface of the pressing roller is set to an arc-shaped concave surface. When a pair of the pressing rollers are close to each other, the plastic pipe can be limited to the arc-shaped concave surface. The outer wall of the pipe fits with the arc-shaped concave surface, which can prevent the pipe from shifting during the pipe cutting process.

[0016] (3) Anti-indentation: When the pair of pressing rollers approach each other and clamp the plastic pipe, the flexible sleeve is sleeved on the arc-shaped concave surface, and the flexible sleeve and the wall of the plastic pipe are squeezed, and the flexible sleeve can be partially deformed. Since the flexible sleeve is relatively soft and elastic, it can effectively prevent deep indentations from occurring on the contact surface of the plastic pipe during the process of pressing the pipe. At the same time, the flexible sleeve can increase the friction force on the contact surface of the plastic pipe and prevent the pipe from shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a front view of a clamping device for cutting plastic pipes.

[0018] Figure 2 It is a half-section view of a clamping device for cutting plastic pipes.

[0019] Figure 3 for Figure 2 -A: Partially enlarged image.

[0020] Figure 4 This is a left view of a clamping device for cutting plastic pipes.

[0021] Figure 5 for Figure 4 -B: Partial enlarged image.

[0022] In the figure: the stand 10, the bottom plate 110, the stand 120, the through groove 121, the scale line 122, the clamping roller 20, the tube clamping channel 210, the arc-shaped concave surface 220, the flexible sleeve 230, the main shaft 240, the bearing 250, the annular side plate 260, the limit groove 261, the elastic plate 270, the limit tension spring 280, the top column 290, the threaded cylinder 291, the stud 292, the distance adjusting member 30, the lifting push rod 310, and the connecting shaft 320. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The technical solution of the present invention will be further described below in conjunction with the drawings of the embodiments of the present invention, and the present invention is not limited to the following specific implementation methods.

[0024] It should be understood that the same or similar numbers in the drawings of the embodiments correspond to the same or similar parts. In the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom" and the like indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] Please see Figures 1 to 5 A clamping device for cutting plastic pipes comprises a stand 10, a pair of clamping rollers 20 and a distance adjusting member 30. In the vertical direction, the pair of clamping rollers 20 are rotatably arranged on the stand 10. A pipe clamping channel 210 is reserved between the pair of clamping rollers 20. The roller surface of the clamping roller 20 is provided with an arc-shaped concave surface 220. A flexible sleeve 230 is arranged on the clamping roller 20. The flexible sleeve 230 is sleeved on the arc-shaped concave surface 220 and fits with the arc-shaped concave surface 220. The distance adjusting member 30 is arranged on the stand 10 and connected to the clamping roller 20 for adjusting the distance between the pair of clamping rollers 20.

[0026] The stand 10 is a frame body composed of plates or rods and has a sense of space.

[0027] The pair of pressing rollers 20 are separately arranged one above and one below, and the distance adjusting member 30 can adjust the upper pressing roller 20 or the lower pressing roller 20, or adjust the upper and lower pressing rollers 20 at the same time.

[0028] The flexible sleeve 230 is made of a flexible material that can be deformed after being squeezed and has a certain elasticity.

[0029] Specific use process:

[0030] Generally, the plastic pipe is placed on a special supporting plate for cutting. The clamping device is fixedly provided at both ends of the supporting plate. The pipe clamping channel 210 of the clamping roller 20 is arranged corresponding to the supporting plate. To make the plastic pipe pass through the pipe clamping channel 210 in parallel, for plastic pipes of different diameters, the distance between the pair of clamping rollers 20 is first adjusted by the distance adjusting member 30 to increase the distance between the pair of clamping rollers 20, and the end of the plastic pipe is moved through the pipe clamping channel 210, that is, first pass through the clamping device at one end of the supporting plate to push the plastic pipe to fit the supporting plate for movement, and then pass through the clamping device at the other end of the supporting plate to continue to push the plastic pipe to move. The pair of clamping rollers 20 move along with the plastic pipe. The plastic pipe moves a preset distance after the movement and rotation is generated; then, the distance between the pair of clamping rollers 20 is adjusted by the distance adjusting member 30 to shorten the distance between the pair of clamping rollers 20. Since the clamping rollers 20 are provided with an arc-shaped concave surface 220, the arc-shaped concave surfaces 220 of the pair of clamping rollers 20 can fit with the pipe wall, just clamping the plastic pipe in the pipe clamping channel 210 to prevent the plastic pipe from shaking in the pipe clamping channel 210. Since the flexible sleeve 230 is provided in the arc-shaped concave surface 220, after clamping, the flexible sleeve 230 will be partially deformed, but will not leave an indentation on the outer wall of the plastic pipe, and the clamped pipe will be cut. Finally, the above steps are repeated to cut again.

[0031] The effect achieved:

[0032] (1) Suitable for clamping plastic pipes of different diameters; by adjusting the pipe clamping channel 210 between the pair of clamping rollers 20 through the distance adjusting member 30, plastic pipes of different diameters are clamped and put into a clamped state.

[0033] (2) Preventing the pipe from shifting; the roller surface of the pressing roller 20 is set to an arc-shaped concave surface 220. When a pair of pressing rollers 20 are close to each other, the plastic pipe can be limited to the inside of the arc-shaped concave surface 220. The outer wall of the pipe fits with the arc-shaped concave surface 220, which can prevent the pipe from shifting during the pipe cutting process.

[0034] (3) Anti-indentation: When the pair of pressing rollers 20 approach each other and clamp the plastic pipe, the flexible sleeve 230 is sleeved on the arc-shaped concave surface 220, and the flexible sleeve 230 and the pipe wall of the plastic pipe are squeezed. The flexible sleeve 230 can be partially deformed. Since the flexible sleeve 230 is relatively soft and elastic, it can effectively prevent deep indentations from occurring on the contact surface of the plastic pipe during the process of pressing the pipe. At the same time, the flexible sleeve 230 can increase the friction force on the contact surface of the plastic pipe and prevent the pipe from shifting.

[0035] In one embodiment, the first clamping roller 20 is fixedly disposed on the stand 10 and can rotate on the stand 10, the second clamping roller 20 is located above the first clamping roller 20, and the second clamping roller 20 is connected to the distance adjusting member 30. By adjusting the second clamping roller 20 to move up and down, the distance between a pair of clamping rollers 20 is adjusted.

[0036] As a preference, see Figure 1 , Figure 4 , Figure 5 The stand 10 includes a base plate 110 and a pair of vertical plates 120. The pair of vertical plates 120 are arranged parallel to the base plate 110. The clamping roller 20 is located between the pair of vertical plates 120. A through slot 121 is opened on the vertical plate 120. The distance adjusting member 30 passes through the through slot 121 and is connected to the clamping roller 20. A scale line 122 is arranged in the through slot 121. The through slot 121 is vertically arranged, and the distance adjusting member 30 can move up and down along the through slot 121. The distance adjusting member 30 moves to the highest point of the through slot 121, that is, the maximum displacement of the pressing roller 20, and the distance between the pair of pressing rollers 20 is the largest (the tube clamping channel 210 is in the maximum state). The distance adjusting member 30 moves to the lowest point of the through slot 121, that is, the minimum displacement of the pressing roller 20, and the distance between the pair of pressing rollers 20 is the smallest (the tube clamping channel 210 is in the minimum state); the amplitude of the up and down movement of the distance adjusting member 30 can be judged according to the scale line 122 set in the through slot 121, such as: the distance adjusting member 30 is moved to the highest point of the through slot 121, and by judging plastic pipes of different diameters, if the diameter is thicker, the distance adjusting member 30 drives the pressing roller 20 to descend to a smaller amplitude, and if the diameter is thinner, the distance adjusting member 30 drives the pressing roller 20 to descend to a larger amplitude.

[0037] For further optimization, see Figure 1 and Figure 2 The distance adjusting member 30 includes a lifting push rod 310 and a connecting shaft 320. The lifting push rod 310 is fixed to the side wall of the vertical plate 120. The first end of the connecting shaft 320 is connected to the end of the lifting push rod 310. The second end of the connecting shaft 320 passes through the through slot 121 and is connected to the pressing roller 20. A group of lifting push rods 310 are provided, which are fixedly provided on both sides of the vertical plate 120, respectively. The lifting push rod 310 pushes the connecting shaft 320 to move up and down in the vertical direction. The connecting rod is horizontally provided at the end of the lifting push rod 310. The connecting rod passes through the through slot 121 and can move up and down in the through slot 121.

[0038] Specifically, the lifting push rod 310 is a driving cylinder.

[0039] Specifically, the lifting push rod 310 is an electric push rod.

[0040] Further, see Figure 2 The clamping roller 20 includes a main shaft 240, a bearing 250, an annular side plate 260 and an elastic plate 270. The end of the main shaft 240 is connected to the distance adjusting member 30. The bearing 250 is sleeved on the main shaft 240. The annular side plate 260 is sleeved on the outer ring of the bearing 250 and is limited. A limiting groove 261 is provided on the annular side plate 260. The elastic plate 270 is clamped in the limiting groove 261 and is squeezed and bent to form the arc-shaped concave surface 220. The main shaft 240 is connected to the connecting shaft 320 of the distance adjusting member 30, and the main shaft 240 does not rotate; the bearing 250 is sleeved on the main shaft 240, and the annular side plate 260 is sleeved on the outer ring of the bearing 250. The annular side plate 260 rotates with the rotation of the bearing 250, and the elastic plate 270 rotates synchronously with the annular side plate 260; if the pressing roller 20 descends too much during the process of descending, the pair of pressing rollers 20 strongly squeeze the plastic pipe, which will cause serious deformation of the pipe, and even rupture of the brittle pipe. Therefore, a limiting groove 261 is provided on the annular side plate 260, and the elastic plate 270 is clamped in the limiting groove 261 and limited to prevent the elastic plate 270 from escaping from the limiting groove 261. When the pressing roller 20 descends too much and the plastic pipe is strongly squeezed by the elastic plate 270, the elastic plate 270 will bend elastically. While the elastic plate 270 presses the plastic pipe, it can also prevent the pipe from being severely deformed or even broken.

[0041] As a further preference, see Figure 2The clamping roller 20 also includes a limiting tension spring 280 , a first end of which is fixedly disposed on the outer ring surface of the bearing 250 , and a second end of the limiting tension spring 280 is connected to the lowest point of the bending portion of the elastic plate 270 . When the elastic plate 270 is not subjected to strong extrusion, that is, when the pressing roller 20 is in a normal state, the limiting tension spring 280, when the elastic plate 270 is subjected to strong extrusion, the elastic plate 270 will bend elastically, and the second end of the limiting tension spring 280 is connected to the lowest point of the bending portion of the elastic plate 270, and is in a stretched state or a contracted state; if the limiting tension spring 280 is in a stretched state, when the elastic plate 270 is subjected to strong extrusion, the limiting tension spring 280 is pushed to reset, and after the elastic plate 270 is no longer subjected to strong extrusion, the elastic plate 270 is reset, and the limiting tension spring 280 is pulled to an initial stretched state; if the limiting tension spring 280 is in a contracted state, when the elastic plate 270 is subjected to strong extrusion, the limiting tension spring 280 is pushed to continue to contract, and after the elastic plate 270 is no longer subjected to strong extrusion, the elastic plate 270 is reset, and the limiting tension spring 280 is pulled to an initial contracted state.

[0042] For further optimization, see Figure 2 and Figure 3 , a plurality of top posts 290 are arranged on the annular side plate 260, one end of the top post 290 is located outside the annular side plate 260, and the other end passes through the annular side plate 260 and extends into the limiting groove 261, and is connected to the elastic plate 270. Generally, the arc-shaped concave surface 220 formed by the elastic plate 270 is suitable for a certain range of pipe diameters. When the pipe diameter of the plastic pipe is smaller than the pipe diameter of a certain range or larger than the pipe diameter of a certain range, the arc-shaped concave surface 220 formed by the elastic plate 270 cannot clamp the plastic pipe. Therefore, the elastic plate 270 needs to be fine-tuned, and the top post 290 is in a state of supporting the elastic plate 270 in the limiting groove 261. For example, when the diameter of the plastic pipe is too large or too small, the top column 290 contracts and the elastic plate 270 extends in the limiting groove 261, so that the arc-shaped concave surface 220 formed by the elastic plate 270 is enlarged, and the curvature of the arc-shaped concave surface 220 is changed, so that the arc-shaped concave surface 220 is convenient to fit with the plastic pipe wall.

[0043] Preferably, the top column 290 includes a threaded barrel 291 and a stud 292, wherein the threaded barrel 291 is fixedly disposed on the annular side plate 260, and the stud 292 is sleeved with the threaded barrel 291, and one end of the stud 292 extends into the limiting groove 261 and is connected to the elastic plate 270. By screwing the stud 292 to rotate in the threaded barrel 291 and screwing it out of the threaded barrel 291, the elastic plate 270 is driven to move in the limiting groove 261, so that the arc-shaped concave surface 220 formed by the elastic plate 270 is expanded, and the curvature of the arc-shaped concave surface 220 is changed.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A clamping device for cutting plastic pipes, characterized in that: It includes a vertical frame, a pair of clamping rollers and a distance adjusting member. Along the vertical direction, the pair of clamping rollers are rotatably arranged on the vertical frame. A pipe clamping channel is reserved between the pair of clamping rollers. The roller surface of the clamping roller is provided with an arc-shaped concave surface. A flexible sleeve is provided on the clamping roller. The flexible sleeve is arranged on the arc-shaped concave surface and fits with the arc-shaped concave surface. The distance adjusting member is arranged on the vertical frame and connected to the clamping roller for adjusting the distance between the pair of clamping rollers.

2. A clamping device for cutting plastic pipes as claimed in claim 1, characterized in that: The stand comprises a base plate and a pair of vertical plates, wherein the pair of vertical plates are arranged parallel to the base plate, the clamping roller is located between the pair of vertical plates, a through slot is provided on the vertical plate, the distance adjusting member passes through the through slot and is connected to the clamping roller, and scale lines are provided in the through slot.

3. A clamping device for cutting plastic pipes as claimed in claim 2, characterized in that: The distance adjusting member includes a lifting push rod and a connecting shaft, wherein the lifting push rod is fixed to the side wall of the vertical plate, the first end of the connecting shaft is connected to the end of the lifting push rod, and the second end of the connecting shaft passes through the through slot and is connected to the clamping roller.

4. A clamping device for cutting plastic pipes as claimed in claim 1, characterized in that: The clamping roller includes a main shaft, a bearing, an annular side plate and an elastic plate. The end of the main shaft is connected to the distance adjusting member. The bearing is sleeved on the main shaft. The annular side plate is sleeved on the outer ring of the bearing and is limited. A limiting groove is arranged on the annular side plate. The elastic plate is clamped in the limiting groove and is bent by compression to form the arc-shaped concave surface.

5. A clamping device for cutting plastic pipes as claimed in claim 4, characterized in that: The clamping roller further comprises a limit tension spring, a first end of which is fixedly arranged on the surface of the outer ring of the bearing, and a second end of which is connected to the lowest point of the bending portion of the elastic plate.

6. A clamping device for cutting plastic pipes as claimed in claim 4, characterized in that: A plurality of top columns are arranged on the annular side plate, one end of the top column is located outside the annular side plate, and the other end passes through the annular side plate and extends into the limiting groove to be connected with the elastic plate.

7. A clamping device for cutting plastic pipes as claimed in claim 6, characterized in that: The top column includes a threaded barrel and a stud, the threaded barrel is fixedly arranged on the annular side plate, the stud is sleeved with the threaded barrel, one end of the stud extends into the limiting groove and is connected to the elastic plate.

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