A continuous expanding and contracting pipe forming device

Abstract

This utility model discloses a continuous expansion and contraction pipe forming device, belonging to the field of pipe processing and metal forming. The device aims to solve the problems of low processing efficiency, easy wear and tear on pipes, easy jamming, and poor operational coordination in traditional single-cavity processing. It includes a worktable, on which are mounted a lower support mold, a limiting and lifting assembly, a guide rail frame, a side forming mold, a feeding assembly, a support frame, an upper forming mold, and a control box. The lower support mold and the upper forming mold adopt a four-cavity layout, enabling parallel processing of multiple processes. The feeding assembly triggers a liquid pump via an infrared sensor, spraying lubricating oil onto the pipe through a nozzle to reduce friction and jamming. The limiting and lifting assembly assists in the flow of the pipe between the mold cavities. The control box coordinates the actions of each component. Through the combination of lubrication design and a multi-cavity continuous processing layout, this device significantly improves the production efficiency of pipe expansion and contraction forming while ensuring product quality, making it suitable for mass production needs.

Description

Technical Field

[0001] This utility model relates to the field of pipe processing and metal forming, and in particular to a continuous expansion and contraction pipe forming device. Background Technology

[0002] In the field of pipe fittings processing, expansion and contraction molding is a common process used to process the ends or specific parts of pipe fittings into the required size and shape.

[0003] In the existing technology, pipe expansion and shrink forming devices mostly adopt a single mold cavity design, which can only process one pipe at a time. After processing, the pipe needs to be removed manually or mechanically, and then a new pipe to be processed is put in for the next processing. This processing method has the problem of low production efficiency and cannot meet the needs of mass production.

[0004] Meanwhile, in traditional equipment, the friction between the pipe and the mold is relatively high during processing, which easily leads to wear on the pipe surface, affecting the product's appearance and dimensional accuracy, and reducing the product qualification rate. Moreover, due to the lack of an effective lubrication mechanism, the pipe may jam during its flow through the mold cavity, interrupting the production process and further affecting production efficiency. In addition, the coordination of the various components in traditional equipment is poor, requiring frequent manual operation and monitoring, which not only increases labor costs but also makes it easy for human error to cause unstable processing quality.

[0005] To address this, a continuous expansion and contraction tube forming device is proposed. Utility Model Content

[0006] The purpose of this utility model is to solve the above problems and propose a continuous expansion and contraction tube forming device that can improve production efficiency, ensure product quality, and reduce material jamming.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a continuous expansion and contraction pipe forming device, comprising a worktable, a lower support mold assembled in a rectangular through hole of the worktable, a limit lifting component provided in the middle of the bottom surface of the worktable platform, a guide rail frame symmetrically assembled on the top surface of the worktable, a first hydraulic cylinder assembled in a circular through hole in the middle of the guide rail frame, a side forming mold slidably assembled on the guide rail inside the guide rail frame, a feeding component assembled at the upper end of the middle of one side of the worktable, a support frame welded between the top surfaces of the guide rail frames, a second hydraulic cylinder assembled in a circular through hole on the top surface of the support frame, an upper forming mold assembled at the lower end of the second hydraulic cylinder, and a control box assembled in the upper frame of the worktable.

[0008] Preferably, both the lower support mold and the upper forming mold have a four-cavity layout. The first hydraulic cylinder can drive the side forming mold to slide along the guide rail of the outer frame, and the second hydraulic cylinder can drive the upper forming mold to rise and fall.

[0009] Preferably, the limiting and lifting assembly includes a mounting frame welded to the middle of the bottom surface of the workbench platform, a first electric telescopic rod assembled in the through hole in the middle of the mounting frame, a limiting and lifting frame assembled on the upper end of the first electric telescopic rod, a second electric telescopic rod assembled in the through hole at the front end of the mounting frame, and a baffle assembled on the upper end of the second electric telescopic rod.

[0010] Preferably, the first electric telescopic rod can drive the limiting lifting frame to move up and down, the inner wall of the limiting lifting frame is in contact with the side of the lower support mold, and the middle partition of the limiting lifting frame is inserted into the through hole in the middle of the lower support mold; the second electric telescopic rod can drive the baffle to move up and down.

[0011] Preferably, the feeding assembly includes an L-shaped support frame welded to the upper middle part of one side of the workbench, an inclined frame welded to the surface of the L-shaped support frame, a lubricating oil bottle assembled inside the circular frame of the L-shaped support frame, a nozzle symmetrically assembled in the through hole at the upper end of the L-shaped support frame, an infrared sensor assembled in the through hole at the front corner of the L-shaped support frame, a bottle cap movably fitted on the upper end of the lubricating oil bottle, and a liquid pump assembled on the top surface of the bottle cap.

[0012] Preferably, when the baffle is raised, it fits against the rear end of the inclined frame. The downward tilt angle of the inclined frame is consistent with the tilt angle of the lower support mold. A rubber stopper for sealing is inserted into the air inlet at the upper end of the lubricating oil bottle. The front end of the nozzle is aligned with one end of the through hole on the side of the inclined frame, and the front end of the infrared sensor is aligned with the other end of the through hole on the side of the inclined frame. Both nozzles are connected to the liquid outlet of the pump. The liquid inlet pipe of the pump is inserted into the bottom of the lubricating oil bottle.

[0013] Preferably, the control box is electrically connected to the first electric telescopic rod, the second electric telescopic rod, the first hydraulic cylinder, the nozzle, the infrared sensor, the liquid pump, and the second hydraulic cylinder, and can control the above components.

[0014] The beneficial effects of this utility model are as follows: By combining the lubrication design with the multi-cavity continuous processing layout of this continuous expansion and contraction tube forming device, the production efficiency of tube expansion and contraction forming is significantly improved while ensuring product quality. It is suitable for mass production needs, and the specific beneficial effects are as follows:

[0015] The device reduces friction and wear, improves product qualification rate, and avoids material jamming through the lubrication mechanism in the feeding assembly.

[0016] When the pipe passes through the side through-hole of the inclined frame, the infrared sensor detects the pipe and triggers the liquid pump to operate. Symmetrically assembled nozzles then spray a small amount of lubricating oil onto both ends of the pipe. The lubricating oil's effect is directly reflected in the processing, reducing friction between the side forming die and the pipe's ends during stamping, lowering the probability of surface wear, and thus improving the product's appearance and dimensional accuracy. Simultaneously, the lubricated pipe flows more smoothly within the mold cavity, effectively preventing jamming caused by excessive frictional resistance and ensuring continuous and stable operation of the equipment.

[0017] The four-cavity layout improves production efficiency.

[0018] Both the lower support mold and the upper forming mold surface adopt a four-cavity layout, enabling the device to process pipe fittings simultaneously through multiple processes. Each of the four processes corresponds to a different forming requirement, and the pipe fitting flows sequentially between the four cavities, gradually completing the expansion and contraction forming process. This design reduces the frequent mold opening and closing operations required when switching between different forming processes in traditional single-cavity processing, as well as the wasted time spent on manual or mechanical material handling. Furthermore, during the pipe fitting flow, when a processed pipe fitting leaves the first cavity, a new pipe fitting to be processed can simultaneously enter the first cavity, achieving continuous feeding and parallel processing of multiple processes, significantly improving overall production efficiency. Attached Figure Description

[0019] Appendix Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Appendix Figure 2 This is the utility model Figure 1 Enlarged diagram of part A in the middle;

[0021] Appendix Figure 3 This is the utility model Figure 1 Enlarged diagram of section B;

[0022] Appendix Figure 4 This is an exploded view of the limiting and lifting component of this utility model;

[0023] Appendix Figure 5 This is a schematic diagram of the guide rail frame, hydraulic cylinder No. 1, and side forming mold structure of this utility model.

[0024] Appendix Figure 6 This is a schematic diagram of the feeding assembly structure of this utility model.

[0025] Legend: 1. Workbench; 2. Lower support mold; 3. Limiting and lifting assembly; 301. Mounting frame; 302. Electric telescopic rod No. 1; 303. Limiting and lifting frame; 304. Electric telescopic rod No. 2; 305. Baffle; 4. Guide rail outer frame; 5. Hydraulic cylinder No. 1; 6. Side forming mold; 7. Feeding assembly; 701. L-shaped support frame; 702. Inclined frame; 703. Lubricating oil bottle; 704. No. 1 nozzle; 705. Infrared sensor; 706. Bottle cap; 707. Liquid pump; 8. Support frame; 9. Hydraulic cylinder No. 2; 10. Upper forming mold; 11. Control box. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] See Figure 1-5 As shown in the figure, a continuous expansion and contraction tube forming device in this embodiment includes a workbench 1, a lower support mold 2 is installed in the rectangular through hole of the workbench 1, a limit lifting component 3 is provided in the middle of the bottom surface of the workbench 1, a guide rail frame 4 is symmetrically installed on the top surface of the workbench 1, a first hydraulic cylinder 5 is installed in the circular through hole in the middle of the guide rail frame 4, a side forming mold 6 is slidably installed on the guide rail inside the guide rail frame 4, a feeding component 7 is installed at the upper end of the middle of one side of the workbench 1, a support frame 8 is welded between the top surfaces of the guide rail frame 4, a second hydraulic cylinder 9 is installed in the circular through hole on the top surface of the support frame 8, an upper forming mold 10 is installed at the lower end of the second hydraulic cylinder 9, and a control box 11 is installed in the upper frame of the workbench 1.

[0028] Both the lower support mold 2 and the upper forming mold 10 adopt a four-cavity layout. The first hydraulic cylinder 5 can drive the side forming mold 6 to slide along the guide rail of the outer frame 4, and the second hydraulic cylinder 9 can drive the upper forming mold 10 to rise and fall.

[0029] Specifically, the workbench 1 serves as the basic support structure of the entire device, providing an installation platform for other components. Its rectangular through hole is used to assemble the lower support mold 2. The middle of the bottom surface of the platform provides an installation position for the limiting and lifting component 3. The top surface is used to assemble components such as the guide rail frame 4. The control box 11 is assembled inside the upper frame, which plays the role of integrating and supporting various components.

[0030] The lower support mold 2 has a four-cavity layout on its surface, which is used to place the pipe to be processed. It cooperates with the upper forming mold 10 to clamp the pipe in the cavity during the processing and provide bottom support for the pipe. It is an important basic component for pipe forming and processing.

[0031] The guide rail outer frame 4 is symmetrically assembled on the top surface of the worktable 1 to provide a sliding guide rail for the side forming mold 6. At the same time, the support frame 8 welded between its top surfaces provides an installation position for the second hydraulic cylinder 9 and also provides an installation carrier for the first hydraulic cylinder 5.

[0032] The No. 1 hydraulic cylinder 5 is installed in the circular through hole in the middle of the guide rail outer frame 4. It can drive the side forming mold 6 to slide along the guide rail of the guide rail outer frame 4. During the processing, the two ends of the pipe are punched to complete the forming process of the two ends of the pipe.

[0033] The side forming mold 6 can be slidably mounted on the inner guide rail of the guide rail outer frame 4. It slides under the drive of the first hydraulic cylinder 5 to punch the two ends of the pipe fitting. It is the direct action component to achieve the forming of the two ends of the pipe fitting.

[0034] The support frame 8 is welded between the top surfaces of the guide rail outer frame 4, providing an installation carrier for the No. 2 hydraulic cylinder 9 and enhancing the overall structural stability of the device.

[0035] The No. 2 hydraulic cylinder 9 is installed in the circular through hole on the top surface of the support frame 8. It can drive the upper forming mold 10 to rise and fall. During processing, it drives the upper forming mold 10 to press down and cooperate with the lower support mold 2 to clamp the pipe in the mold cavity.

[0036] The upper forming mold 10 is mounted on the lower end of the second hydraulic cylinder 9. The surface adopts a four-cavity layout. It is raised and lowered under the drive of the second hydraulic cylinder 9, clamping the pipe with the lower support mold 2, and cooperating with the side forming mold 6 to complete the forming process of the pipe.

[0037] See appendix Figure 1-4 As shown, the limiting and lifting assembly 3 includes a mounting frame 301 welded to the middle of the bottom surface of the workbench 1, a first electric telescopic rod 302 assembled in the middle through hole of the mounting frame 301, a limiting and lifting frame 303 assembled on the upper end of the first electric telescopic rod 302, a second electric telescopic rod 304 assembled in the front through hole of the mounting frame 301, and a baffle 305 assembled on the upper end of the second electric telescopic rod 304.

[0038] The first electric telescopic rod 302 can drive the limiting lifting frame 303 to rise and fall. The inner wall of the limiting lifting frame 303 is in contact with the side of the lower support mold 2. The middle partition of the limiting lifting frame 303 is inserted into the through hole in the middle of the lower support mold 2. The second electric telescopic rod 304 can drive the baffle 305 to rise and fall.

[0039] Specifically, the mounting frame 301 is welded to the middle of the bottom surface of the workbench 1 platform, providing a mounting carrier for the No. 1 electric telescopic rod 302 and the No. 2 electric telescopic rod 304, and playing a role in fixing and supporting them.

[0040] The No. 1 electric telescopic rod 302 is assembled in the through hole in the middle of the mounting frame 301, which can drive the limit lifting frame 303 to rise and fall. After the processing is completed, the processed pipe is pushed out of the mold cavity of the lower support mold 2.

[0041] The limiting lifting frame 303 is assembled on the upper end of the first electric telescopic rod 302, and its inner wall fits against the side of the lower support mold 2. The middle partition is inserted into the through hole in the middle of the lower support mold 2. When ejecting the pipe, the inner wall can prevent the pipe from shifting, so that the pipe can only slide downward along the top surface of the middle partition, ensuring the accuracy of the pipe's movement path.

[0042] The No. 2 electric telescopic rod 304 is installed in the through hole at the front end of the mounting frame 301 and can drive the baffle 305 to rise and fall. The rise and fall of the tubes in the tilting frame 702 is controlled by the baffle 305 to achieve orderly feeding.

[0043] The baffle 305 is mounted on the upper end of the second electric telescopic rod 304. When it is raised, it fits against the rear end of the inclined frame 702, preventing the subsequent pipe from falling. When it is lowered, it allows a pipe to slide into the mold cavity of the lower support mold 2.

[0044] See appendix Figure 1-6 As shown, the feeding assembly 7 includes an L-shaped support frame 701 welded to the upper middle part of one side of the workbench 1, an inclined frame 702 welded to the surface of the L-shaped support frame 701, a lubricating oil bottle 703 assembled in the circular frame of the L-shaped support frame 701, a nozzle 704 symmetrically assembled in the through hole at the upper end of the L-shaped support frame 701, an infrared sensor 705 assembled in the through hole at the front corner of the L-shaped support frame 701, a bottle cap 706 movably sleeved on the upper end of the lubricating oil bottle 703, and a liquid pump 707 assembled on the top surface of the bottle cap 706.

[0045] When the baffle 305 is raised, it fits against the rear end of the inclined frame 702. The downward tilt angle of the inclined frame 702 is consistent with the tilt angle of the lower support mold 2. A rubber stopper for sealing is inserted into the air inlet at the upper end of the lubricating oil bottle 703. The front end of the nozzle 704 is aligned with one end of the side through hole of the inclined frame 702, and the front end of the infrared sensor 705 is aligned with the other end of the side through hole of the inclined frame 702. Both nozzles 704 are connected to the liquid outlet of the liquid pump 707. The liquid inlet pipe of the liquid pump 707 is inserted into the bottom of the lubricating oil bottle 703.

[0046] The control box 11 is electrically connected to the first electric telescopic rod 302, the second electric telescopic rod 304, the first hydraulic cylinder 5, the nozzle 704, the infrared sensor 705, the liquid pump 707, and the second hydraulic cylinder 9, and can control the above components.

[0047] Specifically, the control box 11 is installed in the upper frame of the workbench 1 and is electrically connected to the first electric telescopic rod 302, the second electric telescopic rod 304, the first hydraulic cylinder 5, the nozzle 704, the infrared sensor 705, the liquid pump 707, and the second hydraulic cylinder 9, respectively. It controls the operation of these components, coordinates the orderly operation of each component, and realizes the automated processing of the device.

[0048] L-support frame 701 is welded to the upper middle part of one side of the workbench 1 to provide installation support for tilt frame 702, lubricating oil bottle 703, nozzle 704 and infrared sensor 705.

[0049] The inclined frame 702 is welded to the surface of the L support frame 701, and its front end is aligned with the conveyor belt of the pipe fitting. The pipe fitting slides slowly downward inside it and eventually slides into the mold cavity on the surface of the lower support mold 2, thereby realizing the automatic feeding of the pipe fitting.

[0050] The lubricating oil bottle 703 is assembled inside the circular frame of the L support frame 701 and is used to store lubricating oil. When the device is working, the rubber plug of its air inlet needs to be pulled out to provide lubricating oil to the nozzle 704.

[0051] The nozzle 704 is symmetrically assembled in the through hole at the upper end of the L support frame 701 and is connected to the liquid outlet of the liquid pump 707. Under the action of the liquid pump 707, a small amount of lubricating oil is sprayed into both ends of the pipe fitting to play a lubricating role, reduce friction and wear, improve product qualification rate, avoid material jamming, and facilitate subsequent processing.

[0052] Infrared sensor 705 is installed in a corner through hole at the front end of L support frame 701, with its front end aligned with the other end of the side through hole of inclined frame 702, and is used to sense the passing pipe and thus trigger the working of liquid pump 707.

[0053] The cap 706 is movably fitted onto the upper end of the lubricating oil bottle 703, which serves to seal the lubricating oil bottle 703 and at the same time provides an installation position for the liquid pump 707;

[0054] The pump 707 is mounted on the top surface of the bottle cap 706, and the inlet pipe is inserted into the bottom of the lubricating oil bottle 703, which can draw out the lubricating oil in the lubricating oil bottle 703 and deliver it to the nozzle 704.

[0055] The operation process of this utility model is as follows: During preparation, add an appropriate amount of lubricating oil to the lubricating oil bottle 703 of the feeding component 7, tighten the bottle cap 706, and pull out the rubber plug of the air inlet to ensure that the liquid pump 707 can smoothly draw lubricating oil. Next, connect the power supply to the control box 11. At this time, each electric telescopic rod and hydraulic cylinder is in the initial reset state: the first hydraulic cylinder 5 drives the side forming mold 6 to be located at the innermost side of the guide rail outer frame 4, the second hydraulic cylinder 9 drives the upper forming mold 10 to the highest position, the first electric telescopic rod 302 drives the limiting lifting frame 303 to descend below the lower support mold 2, and the second electric telescopic rod 304 drives the baffle 305 to rise, which fits against the rear end of the inclined frame 702 to prevent the pipe from falling.

[0056] During feeding and lubrication, the pipe is conveyed to the front end of the inclined frame 702 via a conveyor belt. Since the downward tilt angle of the inclined frame 702 matches the tilt angle of the lower support mold 2, the pipe slowly slides backward within the inclined frame 702 under gravity until it is blocked by the baffle 305. When the control box 11 issues a feeding command, the second electric telescopic rod 304 retracts, causing the baffle 305 to descend. The foremost pipe in the inclined frame 702 is no longer obstructed and slides down the inclined surface to the lower support mold 2, eventually falling into the first mold cavity. During this process, when the pipe passes through the side through-hole of the inclined frame 702, the infrared sensor 705 detects the pipe's passage and immediately sends a signal to the control box 11, which then starts the liquid pump 707. The liquid pump 707 extracts lubricating oil from the lubricating oil bottle 703 and sprays a small amount of lubricating oil onto both ends of the pipe through symmetrically assembled nozzles 704, providing lubrication and reducing friction during subsequent processing. After lubrication is completed, the pump 707 stops working, and at the same time, the second electric telescopic rod 304 extends, driving the baffle 305 to rise and re-fit with the rear end of the inclined frame 702, preventing the subsequent pipe parts from falling and completing a single feeding.

[0057] In the first processing step, control box 11 controls the extension of hydraulic cylinder 9, driving the upper forming mold 10 downward until the cavity of the upper forming mold 10 fits against the tube in the first cavity of the lower support mold 2, with both clamping the tube to fix its position. Then, hydraulic cylinder 5 extends, pushing the side forming mold 6 to slide along the inner guide rail of the outer frame 4 towards the center, stamping both ends of the tube to complete the first expansion and contraction forming process. After processing, hydraulic cylinder 5 retracts, causing the side forming mold 6 to return to its initial position, and hydraulic cylinder 9 retracts, driving the upper forming mold 10 upward to release the clamping of the tube.

[0058] When the pipe fitting moves to the next mold cavity, the control box 11 instructs the first electric telescopic rod 302 to extend, causing the limiting lifting frame 303 to move upward. Since the inner wall of the limiting lifting frame 303 is in contact with the side of the lower support mold 2, and the central partition is inserted into the central through hole of the lower support mold 2, the rising process will eject the processed pipe fitting from the first mold cavity of the lower support mold 2. During ejection, the inner wall of the limiting lifting frame 303 restricts the pipe fitting's displacement, allowing it to slide downwards along the top surface of the central partition. After leaving the top of the first mold cavity, the first electric telescopic rod 302 retracts, causing the limiting lifting frame 303 to reset, and the pipe fitting smoothly falls into the second mold cavity of the lower support mold 2.

[0059] Repeating the above processing and transfer, the pipe fitting undergoes a second, third, and fourth processing step. After each transfer, when the pipe fitting leaves the first cavity of the lower support mold 2, the second electric telescopic rod 304 drives the baffle 305 to descend again, allowing the next pipe fitting to be processed to slide into the first mold cavity, achieving continuous feeding. The upper forming mold 10 and the lower support mold 2 cooperate to clamp the pipe fitting, the side forming mold 6 performs stamping, and the limiting lifting frame 303 ejects the pipe fitting and transfers it to the next mold cavity. The four processes correspond to different forming requirements, gradually completing the continuous expansion and contraction forming of the pipe fitting.

[0060] When the processing is completed and the material is discharged, after the pipe has passed through the four cavities of the lower support mold 2 and completed all four processing steps, it slides out of the lower support mold 2 from the fourth cavity under the ejection action of the limiting lifting frame 303 and falls into the discharge collection area preset by the device.

[0061] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuous expanding and contracting tube forming device, characterized in that: The system includes a workbench (1), a lower support mold (2) is installed in the rectangular through hole of the workbench (1), a limit lifting component (3) is provided in the middle of the bottom surface of the workbench (1), a guide rail frame (4) is symmetrically installed on the top surface of the workbench (1), a first hydraulic cylinder (5) is installed in the circular through hole in the middle of the guide rail frame (4), a side forming mold (6) is slidably installed on the guide rail inside the guide rail frame (4), a feeding component (7) is installed at the upper end of the middle of one side of the workbench (1), a support frame (8) is welded between the top surfaces of the guide rail frame (4), a second hydraulic cylinder (9) is installed in the circular through hole on the top surface of the support frame (8), an upper forming mold (10) is installed at the lower end of the second hydraulic cylinder (9), and a control box (11) is installed in the upper frame of the workbench (1).

2. The continuous expansion and contraction tube forming device according to claim 1, characterized in that: The surfaces of the lower support mold (2) and the upper forming mold (10) are both arranged in a four-cavity layout. The first hydraulic cylinder (5) can drive the side forming mold (6) to slide along the guide rail of the guide rail frame (4). The second hydraulic cylinder (9) can drive the upper forming mold (10) to rise and fall.

3. The continuous expansion and contraction tube forming device according to claim 2, characterized in that: The limiting and lifting assembly (3) includes a mounting frame (301) welded to the middle of the bottom surface of the workbench (1), a first electric telescopic rod (302) assembled in the middle through hole of the mounting frame (301), a limiting and lifting frame (303) assembled on the upper end of the first electric telescopic rod (302), a second electric telescopic rod (304) assembled in the front through hole of the mounting frame (301), and a baffle (305) assembled on the upper end of the second electric telescopic rod (304).

4. The continuous expansion and contraction tube forming device according to claim 3, characterized in that: The first electric telescopic rod (302) can drive the limiting lifting frame (303) to rise and fall. The inner wall of the limiting lifting frame (303) is in contact with the side of the lower support mold (2). The middle partition of the limiting lifting frame (303) is inserted into the through hole in the middle of the lower support mold (2). The second electric telescopic rod (304) can drive the baffle (305) to rise and fall.

5. The continuous expansion and contraction tube forming device according to claim 4, characterized in that: The feeding assembly (7) includes an L-shaped support frame (701) welded to the upper middle part of one side of the workbench (1), an inclined frame (702) welded to the surface of the L-shaped support frame (701), a lubricating oil bottle (703) assembled in the circular frame of the L-shaped support frame (701), a nozzle (704) symmetrically assembled in the through hole at the upper end of the L-shaped support frame (701), an infrared sensor (705) assembled in the through hole at the front corner of the L-shaped support frame (701), a bottle cap (706) movably sleeved on the upper end of the lubricating oil bottle (703), and a liquid pump (707) assembled on the top surface of the bottle cap (706).

6. The continuous expansion and contraction tube forming device according to claim 5, characterized in that: When the baffle (305) is raised, it fits against the rear end of the inclined frame (702). The downward tilt angle of the inclined frame (702) is consistent with the tilt angle of the lower support mold (2). A rubber stopper for sealing is inserted into the air inlet at the upper end of the lubricating oil bottle (703). The front end of the nozzle (704) is aligned with one end of the side through hole of the inclined frame (702). The front end of the infrared sensor (705) is aligned with the other end of the side through hole of the inclined frame (702). Both nozzles (704) are connected to the liquid outlet of the liquid pump (707). The liquid inlet pipe of the liquid pump (707) is inserted into the bottom of the lubricating oil bottle (703).

7. The continuous expansion and contraction tube forming device according to claim 6, characterized in that: The control box (11) is electrically connected to the first electric telescopic rod (302), the second electric telescopic rod (304), the first hydraulic cylinder (5), the nozzle (704), the infrared sensor (705), the liquid pump (707), and the second hydraulic cylinder (9), and can control the components.

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