A pipe bending device for PVC power pipe production
By combining modular pipe bending devices and limiting components, the problems of uneven pipe wall and difficult demolding in PVC power pipe bending and forming are solved, realizing efficient and precise bending and forming and automatic demolding, thereby improving production efficiency and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HOHHOT HUAWEI PLASTIC CO LTD
- Filing Date
- 2025-08-26
- Publication Date
- 2026-07-17
AI Technical Summary
In the existing PVC power pipe bending and forming process, uneven pressure on the pipe wall leads to wrinkles on the inner side and thinning on the outer side, resulting in high friction during demolding, which affects production efficiency and product yield.
The modularly designed pipe bending device, combined with an arc-shaped pipe bending mold, extrusion rollers, and limiting components, ensures that the PVC power pipe is bent and formed in a preset shape, and is equipped with an electric push rod driven discharge rack to achieve automatic demolding.
It enables precise bending and forming of PVC power pipes, avoiding problems such as excessive bending and demolding, and improving production efficiency and product yield.
Smart Images
Figure CN224510404U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipe processing technology, and in particular to a pipe bending device for the production of PVC power pipes. Background Technology
[0002] PVC power pipes, as an important type of cable protection conduit, are widely used in urban power grids, communication lines, and other infrastructure construction due to their excellent insulation, corrosion resistance, and ease of construction. During actual installation, due to the needs of the route, bends and obstacles are often encountered, thus requiring straight pipes to be bent to create pipe fittings with specific curvatures.
[0003] Existing pipe bending methods mostly use two upper and lower arc-shaped molds to directly squeeze the pipe and bend it into shape. Although this method is simple in structure and quick to operate, it has certain technical defects in practical applications. First, during the extrusion bending process, the PVC pipe lacks effective internal support, which can easily lead to uneven pressure on the pipe wall due to external forces, resulting in inner wrinkles, outer thinning, or even pipe cavity collapse, seriously affecting the structural integrity and subsequent performance of the pipe. Second, the bent pipe fits tightly against the inner wall of the arc-shaped mold. Due to the elastic memory and heat shrinkage characteristics of PVC material, the friction is high during demolding, making it difficult to remove the pipe and easily causing scratches or deformation, reducing production efficiency and product yield. Therefore, it is necessary to design a pipe bending device for PVC power pipe production to address the shortcomings of existing technologies. Utility Model Content
[0004] In order to overcome the shortcomings of the prior art, this utility model provides a pipe bending device for PVC power pipe production.
[0005] Technical Solution: A pipe bending device for producing PVC power pipes includes a base plate, which serves as the assembly carrier for the bending device; it also includes a bending mold, a mounting plate, a rotating frame, an extrusion wheel, a motor, and a limiting component. The bending mold is fixedly connected to the base plate. The bending mold is an arc-shaped bending block with a forming groove on its surface. The base plate and the bending mold are modularly arranged side-by-side, enabling simultaneous bending of multiple PVC power pipes. The mounting plate is fixedly connected to the inner wall of the bending mold near the bending point. The rotating frame is connected to the mounting plate, and an extrusion wheel is fixedly connected to the end of the rotating frame. The extrusion wheel has a groove adapted to the forming groove of the bending mold. The motor is fixedly mounted on the mounting plate, and the output shaft of the motor is connected to the rotating shaft of the rotating frame. A limiting component for limiting the PVC power pipe is provided on the lower outer wall of the bending mold near the bending point.
[0006] Furthermore, it is particularly preferred that the limiting component includes a guide rod, a limiting plate, and an elastic element. The guide rod is fixedly connected to the lower part of the bending die near the bending point. The limiting plate is slidably connected to the lower surface of the bending die through the guide rod. The limiting plate has a limiting groove for limiting the end of the PVC power pipe. An elastic element is provided around the guide rod between the bending die and the limiting plate. The limiting plate is positioned at the transition point from the straight section to the curved section of the bending die under the action of the elastic element. The extrusion wheel can rotate and press down on the limiting plate.
[0007] Furthermore, it is particularly preferred that an installation block is fixedly installed on the bottom of the forming groove near the base plate of the bending mold, and a bending spring is provided on the top of the installation block, the bending spring being used to support the wall of the PVC power pipe.
[0008] Furthermore, it is particularly preferred that an electric push rod is fixedly installed on the mounting plate, a positioning frame is slidably installed on the upper straight section of the bending mold through a through-hole, the piston rod of the electric push rod is connected to the positioning frame, a discharge rack is fixedly installed on the top of the positioning frame, and the bottom contour of the discharge rack is tightly fitted into the forming groove of the bending mold.
[0009] Furthermore, it is particularly preferred that the discharge rack is fixedly provided with a protrusion near the bottom of the forming groove of the bending mold, the protrusion being supported on the end of the PVC power pipe, and the protrusion being used to assist in lifting the PVC power pipe.
[0010] Furthermore, it is particularly preferred that the base plate and the opposite sides of the bending die are fixedly connected to connecting plates, and the connecting plates are provided with mating thread holes, so that the bending device can be fixedly installed on the corresponding work station of the production machine tool.
[0011] Beneficial effects: 1. This utility model adopts a modular design, with the base plate and multiple bending molds arranged side by side, which can simultaneously bend multiple PVC power pipes. Through the cooperation of the forming groove on the arc bending mold and the extrusion roller, it is ensured that the PVC power pipe can be accurately bent into the preset shape.
[0012] 2. This utility model is equipped with a limiting component, which can effectively limit the initial position of the PVC power pipe, ensuring that deformation only occurs in the required bending section, and avoiding excessive bending or damage to the pipe.
[0013] 3. This utility model is equipped with a positioning frame and a discharge rack driven by an electric push rod, which can automatically eject the finished pipe fittings from the mold after bending, significantly improving unloading efficiency and shortening the production cycle. Attached Figure Description
[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.
[0015] Figure 2 This diagram shows the connection relationships of the base plate, pipe bending mold, and mounting plate of this utility model.
[0016] Figure 3 This is a cross-sectional view of the mounting block, bent tube spring, and guide rod of this utility model.
[0017] Figure 4 This is a schematic diagram showing the working relationship between the electric push rod, positioning frame, and discharge rack of this utility model.
[0018] The above-mentioned attached drawings include the following reference numerals: 1. base plate, 2. pipe bending mold, 3. mounting plate, 4. rotating frame, 5. extrusion wheel, 6. motor, 7. mounting block, 8. pipe bending spring, 9. guide rod, 10. limiting plate, 11. elastic element, 12. electric push rod, 13. positioning frame, 14. discharge rack, 15. protrusion, 16. connecting plate, 17. PVC power pipe. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.
[0020] A pipe bending device for PVC power pipe production, such as Figures 1-4 As shown, the device includes a base plate 1, which serves as the assembly carrier for the pipe bending device; it also includes a pipe bending mold 2, a mounting plate 3, a rotating frame 4, an extrusion roller 5, a motor 6, and a limiting component. The pipe bending mold 2 is fixedly connected to the base plate 1. The pipe bending mold 2 is an arc-shaped bending block with a forming groove on its surface. The base plate 1 and the pipe bending mold 2 are modularly arranged side by side, enabling simultaneous bending of multiple PVC power pipes 17. The mounting plate 3 is fixedly connected to the inner wall of the pipe bending mold 2 near the bending point. The rotating frame 4 is connected to the mounting plate 3, and the extrusion roller 5 is fixedly connected to the end of the rotating frame 4. The extrusion roller 5 is equipped with a fitting for the pipe bending mold. 2. The groove of the forming groove, the mounting plate 3 is fixedly installed with a motor 6, the output shaft of the motor 6 is connected to the rotating shaft of the rotating frame 4, the lower part of the bending mold 2 is provided with a limiting component for limiting the PVC power pipe 17 on the outer wall near the bending point, the PVC power pipe 17 is placed vertically in the forming groove on one side of the bending mold 2, the limiting component cooperates with the bending mold 2 to limit one end of the PVC power pipe 17, the motor 6 drives the extrusion wheel 5 on the rotating frame 4 to rotate a certain angle, so that the extrusion wheel 5 presses on the PVC power pipe 17, so that the PVC power pipe 17 can be bent into a preset shape in the forming groove of the bending mold 2.
[0021] like Figure 3 As shown, the limiting component includes a guide rod 9, a limiting plate 10, and an elastic element 11. The guide rod 9 is fixedly connected to the lower part of the bending die 2 near the bending point. The lower surface of the bending die 2 is slidably connected to the limiting plate 10 through the guide rod 9. The limiting plate 10 has a limiting groove for limiting the end of the PVC power pipe 17. An elastic element 11 is provided around the guide rod 9 between the bending die 2 and the limiting plate 10. Under the action of the elastic element 11, the limiting plate 10 is positioned at the transition point from the straight section to the curved section of the bending die 2. The extrusion roller 5 can rotate and press down the limiting plate 10. The limiting plate 10 limits the PVC power pipe 17 to one end, so that the pipe body of the PVC power pipe 17 is only bent at the section that needs to be bent, avoiding excessive bending of the PVC power pipe 17.
[0022] like Figure 3 As shown, a mounting block 7 is fixedly installed at the bottom of the forming groove near the bending mold 2 on the base plate 1. A bending spring 8 is provided on the top of the mounting block 7. The bending spring 8 is used to support the pipe wall of the PVC power pipe 17, resist the compressive stress during bending, maintain the circularity of the pipe's inner diameter, and avoid cross-sectional deformation.
[0023] like Figure 4 As shown, an electric push rod 12 is fixedly installed on the mounting plate 3. A positioning frame 13 is slidably installed on the upper straight section of the bending mold 2 through the through-hole. The piston rod of the electric push rod 12 is connected to the positioning frame 13. A discharge rack 14 is fixedly installed on the top of the positioning frame 13. The bottom contour of the discharge rack 14 fits tightly in the forming groove of the bending mold 2. The electric push rod 12 drives the positioning frame 13 to lift the discharge rack 14 upward, so that the discharge rack 14 can lift the bent PVC power pipe 17 from the forming groove of the bending mold 2 for demolding, thereby improving the efficiency of unloading the bent PVC power pipe 17.
[0024] like Figure 4 As shown, a protrusion 15 is fixedly provided on the bottom of the forming groove of the bending mold 2 near the discharge rack 14. The protrusion 15 is supported on the end of the PVC power pipe 17 and is used to help lift the PVC power pipe 17.
[0025] like Figure 2 As shown, connecting plates 16 are fixedly connected to the opposite sides of the base plate 1 and the bending die 2. The connecting plates 16 have threaded holes for mating, and the connecting plates 16 facilitate the fixed installation of the bending device onto the corresponding workstation of the production machine tool.
[0026] When this pipe bending device is in operation, the operator first places the PVC power pipe 17 to be bent vertically at the entrance of the forming groove on one side of the pipe bending mold 2, so that the bending spring 8 on the mounting block 7 can be inserted into the PVC power pipe 17. Then, the limiting component set at the lower part of the pipe bending mold 2 plays a key role: the limiting plate 10 is automatically positioned at the transition between the straight section and the bending section of the mold under the pre-tightening force of the elastic element 11. The limiting groove on the limiting plate 10 locks and fixes the end of the PVC power pipe 17. Then, the motor 6 is started. The motor 6 drives the rotating frame 4 to rotate the end extrusion roller 5 upward and press the PVC power pipe 17. The extrusion roller 5 adapts its groove to the trajectory of the forming groove of the mold, pressing the pipe body of the PVC power pipe 17 located in the groove. Under the continuous pressure applied by the extrusion roller 5, the PVC power pipe 17 is forced to bend and deform along the forming groove of the pipe bending mold 2 until the preset bending shape is achieved. During the bending process, the bending spring 8, located at the bottom of the forming groove and fixed to the top of the mounting block 7, provides internal support for the pipe wall, effectively resisting the compressive stress generated by bending, maintaining the circularity of the pipe's inner diameter, and preventing the cross-section from collapsing and deforming. At the same time, the limiting plate 10 ensures that the pipe only deforms in the designed bending section, effectively avoiding excessive bending at the pipe end. When unloading is required after bending is completed, the electric push rod 12 is activated. The electric push rod 12 drives the positioning frame 13 to move upward, which in turn drives the discharge rack 14 fixed on its top to lift upward. The bottom contour of the discharge rack 14 closely fits the mold groove, and the protrusion 15 at its bottom precisely acts on the pipe end of the PVC power pipe 17, working together to smoothly lift the bent pipe and remove it from the forming groove of the mold, significantly improving the unloading efficiency. Due to the modular side-by-side design of the base plate 1 and the bending mold 2, the device can perform efficient bending operations on multiple PVC power pipes 17 simultaneously.
[0027] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. All equivalent substitutions made within the principles of this utility model should be included within the protection scope of this utility model. Contents not described in detail in this utility model are existing technologies known to those skilled in the art.
Claims
1. A pipe bending device for producing PVC power pipes, comprising a base plate (1); characterized in that It also includes a pipe bending mold (2), a mounting plate (3), a rotating frame (4), an extrusion wheel (5), a motor (6), and a limiting component. The pipe bending mold (2) is fixedly connected to the base plate (1). The pipe bending mold (2) is an arc-shaped bending block. A forming groove is opened on the surface of the pipe bending mold (2). The base plate (1) and the pipe bending mold (2) are modularly arranged side by side, which can simultaneously bend multiple PVC power pipes (17). The mounting plate (3) is fixedly connected to the inner wall of the pipe bending mold (2) near the bending point. The rotating frame (4) is connected to the mounting plate (3). The extrusion wheel (5) is fixedly connected to the end of the rotating frame (4). The extrusion wheel (5) is provided with a groove that adapts to the forming groove of the pipe bending mold (2). The motor (6) is fixedly installed on the mounting plate (3). The output shaft of the motor (6) is connected to the rotating shaft of the rotating frame (4). A limiting component for limiting the PVC power pipe (17) is provided on the lower part of the pipe bending mold (2) near the bending point.
2. A pipe bending device for PVC electrical power pipe production as claimed in claim 1, characterized in that, The limiting component includes a guide rod (9), a limiting plate (10), and an elastic element (11). The guide rod (9) is fixedly connected to the lower part of the bending mold (2) near the bending point. The lower surface of the bending mold (2) is slidably connected to the limiting plate (10) through the guide rod (9). The limiting plate (10) has a limiting groove for limiting the end of the PVC power pipe (17). An elastic element (11) is provided around the guide rod (9) between the bending mold (2) and the limiting plate (10). The limiting plate (10) is positioned at the transition point from the straight section to the curved section of the bending mold (2) under the action of the elastic element (11). The extrusion wheel (5) can rotate and press down the limiting plate (10).
3. A pipe bending device for PVC electrical power pipe production as claimed in claim 2, characterized in that, An installation block (7) is fixedly installed on the bottom of the forming groove of the base plate (1) near the bending mold (2). A bending spring (8) is provided on the top of the installation block (7). The bending spring (8) is used to support the wall of the PVC power pipe (17).
4. A pipe bending device for PVC electrical power pipe production as claimed in claim 3, characterized in that, An electric push rod (12) is fixedly installed on the mounting plate (3). A positioning frame (13) is slidably installed on the upper straight section of the bending mold (2) through the through-hole. The piston rod of the electric push rod (12) is connected to the positioning frame (13). A discharge rack (14) is fixedly installed on the top of the positioning frame (13). The bottom contour of the discharge rack (14) is closely fitted into the forming groove of the bending mold (2).
5. A pipe bending device for PVC electrical power pipe production as claimed in claim 4, characterized in that, The discharge rack (14) is fixedly provided with a protrusion (15) near the bottom of the forming groove of the bending mold (2). The protrusion (15) is supported on the end of the PVC power pipe (17) and is used to help lift the PVC power pipe (17).
6. A pipe bending device for PVC electrical power pipe production as in claim 5, characterized in that, The base plate (1) and the bending die (2) are both fixedly connected to the opposite sides of the connecting plate (16). The connecting plate (16) has a mating thread hole, and the connecting plate (16) facilitates the fixed installation of the bending device on the corresponding work position of the production machine tool.