Composite pipe impact hydraulic bulging device

Abstract

The utility model discloses an impact hydraulic bulging device for a composite pipe, relates to the technical field of hydraulic bulging of metal pipes, and aims to solve the problems that when the composite pipe is transversely placed on a lower die and two ends of an inner pipe are clamped and plugged for hydraulic bulging in the prior art, the inner pipe is not positioned in the center of an outer pipe; and the problem that the wall thickness is not uniform during hydraulic expansion of the inner pipe is solved. A conical inner pipe positioning piece is connected to the middle of the supporting table, first hydraulic rods are fixedly connected to the lower ends of the middles of the two sides of the C-shaped supporting frame, the telescopic ends of the two first hydraulic rods extend to the inner side of the C-shaped supporting frame and are fixedly connected with side clamping molds, and a lower pressing plate is connected to the upper end of the inner side of the C-shaped supporting frame; by arranging the conical inner pipe positioning piece and the supporting table which are vertically placed, the inner pipe is automatically centered and positioned before bulging, the problem of eccentricity of the inner pipe caused by traditional transverse placement is solved, and therefore the wall thickness uniformity of the composite pipe after bulging is improved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic bulging technology for metal tubes, specifically a composite tube impact hydraulic bulging device. Background Technology

[0002] Hydraulic bulging of metal composite pipes is an advanced plastic forming technology. It uses high-pressure liquid to plastically deform multi-layered composite pipes within a mold, achieving a tight fit with the mold cavity. This process utilizes a hydraulic medium (usually water or oil) as a force carrier, applying internal pressure evenly to the inner wall of the pipe blank, causing it to expand radially to the target shape. Its core advantage lies in its ability to form complex cross-section components in a single operation, while maintaining the interlayer bonding strength of the composite material and avoiding the interfacial performance degradation caused by traditional welding.

[0003] For example, authorization announcement number CN207271889U discloses a hydraulic impact forming device for thin-walled metal composite pipes, comprising a press, a lower worktable, a mold frame II with a container structure, a lower mold for placing the composite pipe, a feeding unit for sealing and axially feeding the composite pipe, an upper worktable, a mold frame I, and an upper mold. The feeding unit is divided into a left feeding unit and a right feeding unit, each consisting of two identical screw jacking mechanisms, respectively located on the left and right sides of the lower worktable. The top of the screw of the screw jack is connected to the injector via a flange; the injector is connected to the plug. The injector automatically adjusts the pressure inside the composite pipe, reducing the need for manual fluid replenishment, and the detection of motor current improves the operational stability of the device.

[0004] The aforementioned technology involves placing the composite tube horizontally on the lower mold, causing the inner tube to be positioned at the lower end of the outer tube due to gravity. When the two ends of the inner tube are clamped and sealed for hydraulic expansion, the inner tube is not located at the center of gravity of the outer tube, resulting in uneven wall thickness during hydraulic expansion. Therefore, there is an urgent market need to develop a composite tube impact hydraulic expansion device to help people solve the existing problems. Utility Model Content

[0005] The purpose of this utility model is to provide a composite tube impact hydraulic expansion device to solve the problem mentioned in the background art, which uses the method of placing the composite tube horizontally on the lower mold, causing the inner tube to be inside the lower end of the outer tube due to gravity. When the two ends of the inner tube are clamped and sealed for hydraulic expansion, the inner tube is not in the center position of the outer tube, resulting in uneven wall thickness during hydraulic expansion.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a composite tube impact hydraulic expansion device, comprising a base plate, a liquid collection tank fixedly connected to the upper center of the base plate, a support platform fixedly connected to the center of the liquid collection tank, a conical inner tube positioning component connected to the center of the support platform, an inner tube sleeved on the upper center of the support platform and outside the conical inner tube positioning component, an outer tube sleeved on the upper center of the support platform and outside the inner tube, a C-shaped support frame fixedly connected to the upper center of the base plate, first hydraulic rods fixedly connected to the lower center of both sides of the C-shaped support frame, the telescopic ends of the two first hydraulic rods extending to the inner side of the C-shaped support frame and fixedly connected to side clamping molds, a lower pressure plate connected to the upper inner side of the C-shaped support frame, an injection head fixedly connected to the center of the lower end face of the lower pressure plate, a liquid storage tube fixedly connected to the center of the upper end face of the lower pressure plate, a third hydraulic rod fixedly connected to the upper end of the liquid storage tube, the lower end of the telescopic end of the third hydraulic rod extending to the inside of the liquid storage tube and fixedly connected to a circular injection plate.

[0007] Preferably, a pressure-resistant pad is fixedly provided on the upper surface of the support platform, and the tapered inner tube positioning component is fixedly connected to the upper surface of the support platform by screws.

[0008] Preferably, guide tubes are fixedly connected to both sides of the C-shaped support frame and to the upper and lower ends of the two first hydraulic rods, and guide rods are fixedly connected to the upper and lower ends of the middle of the outer end faces of the two side clamping molds.

[0009] Preferably, one end of each of the two guide rods on the side clamping mold extends through the inside of the two guide tubes to the outside of the C-shaped support frame, and a semi-circular mold groove is provided on the inner end face of each of the two side clamping molds.

[0010] Preferably, a second hydraulic rod is fixedly connected to both sides of the middle part of the upper end face of the C-shaped support frame, and the lower ends of the two second hydraulic rods are fixedly connected to the upper end face of the lower pressure plate after passing through the C-shaped support frame.

[0011] Preferably, an annular pressure-resistant pad is fitted on the lower end face of the pressure plate and on the upper outer side of the injection head, an injection channel is provided in the middle of the injection head, the upper end of the injection channel is connected to the inside of the liquid storage tube, and an inlet hole is provided on the rear end face of the liquid storage tube and on the lower end of the circular push plate.

[0012] Preferably, a swelling liquid storage tank is fixedly connected to the middle of the upper end face of the C-shaped support frame, and the liquid inlet on the liquid storage pipe is connected to the swelling liquid storage tank through a delivery hose, and a delivery pump is fixedly installed on the delivery hose.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) In this utility model, by setting a vertically placed conical inner tube positioning component and a support platform, the inner tube is automatically centered before expansion, which effectively avoids the problem of inner tube eccentricity caused by gravity in the traditional horizontal placement method, thereby significantly improving the uniformity of the wall thickness of the composite tube after expansion.

[0015] (2) In this utility model, by setting the side clamping mold, the bidirectional synchronous clamping mechanism is adopted in conjunction with the semi-circular mold groove design to ensure that the outer tube always maintains accurate alignment during the expansion process, while improving clamping efficiency and stability, and avoiding the tube offset problem that may be caused by traditional single-sided clamping.

[0016] (3) In this utility model, by setting an annular pressure-resistant pad and a pressure-resistant pad layer, the two ends of the inner tube are effectively sealed, which not only improves the pressure holding capability of the hydraulic system, but also effectively prevents liquid leakage during the expansion process, ensuring the stability and reliability of the forming pressure. Attached Figure Description

[0017] Figure 1 This is a front view of a composite pipe impact hydraulic bulging device according to the present invention;

[0018] Figure 2 This is a front sectional view of the present invention;

[0019] Figure 3 This is a side sectional view of the present invention;

[0020] Figure 4 This is a detailed enlarged view of part A of this utility model.

[0021] In the diagram: 1. Base plate; 101. Liquid receiving tank; 102. Support platform; 103. Pressure-resistant pad; 2. Conical inner tube positioning component; 201. Screw; 3. Inner tube; 301. Outer tube; 4. C-shaped support frame; 401. First hydraulic rod; 402. Guide tube; 403. Second hydraulic rod; 404. Expansion liquid storage tank; 5. Side clamping mold; 501. Semi-circular mold groove; 502. Guide rod; 6. Lower pressure plate; 601. Annular pressure-resistant pad; 602. Injection head; 603. Injection channel; 7. Liquid storage tube; 701. Third hydraulic rod; 702. Circular injection plate; 703. Liquid inlet; 704. Delivery hose; 705. Delivery pump. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figure 1-4This utility model provides an embodiment of a composite tube impact hydraulic expansion device, comprising a base plate 1, a liquid receiving tank 101 fixedly connected to the upper middle part of the base plate 1, a support platform 102 fixedly connected to the middle part of the liquid receiving tank 101, a conical inner tube positioning component 2 connected to the middle part of the support platform 102, a pressure-resistant pad 103 fixedly provided on the upper surface of the support platform 102, the conical inner tube positioning component 2 and the upper surface of the support platform 102 being fixedly connected by screws 201, an inner tube 3 fitted onto the upper end of the support platform 102 and outside the conical inner tube positioning component 2, and an outer tube 301 fitted onto the upper end of the support platform 102 and outside the inner tube 3. The inner tube 3 is centered on the support platform 102 by fitting the lower end of the inner tube 3 onto the conical inner tube positioning component 2. A C-shaped... The support frame 4 and the lower middle of both sides of the C-shaped support frame 4 are fixedly connected to the first hydraulic rods 401. The telescopic ends of the two first hydraulic rods 401 extend to the inside of the C-shaped support frame 4 and are fixedly connected to the side clamping molds 5. One end of the two guide rods 502 on the side clamping molds 5 passes through the inside of the two guide tubes 402 and extends to the outside of the C-shaped support frame 4. The inner end faces of the two side clamping molds 5 are provided with semi-circular mold grooves 501. When the outer tube 301 is inserted into the outside of the inner tube 3, the two first hydraulic rods 401 drive the two side clamping molds 5 to move relative to each other. When the two side clamping molds 5 are closed, the two semi-circular mold grooves 501 close together to clamp the outer tube 301 and place the outer tube 301 in the middle of the upper end of the C-shaped support frame 4, thereby placing the inner tube 3 in the center of the outer tube 301.

[0024] Please see Figure 2 and Figure 4 The upper inner side of the C-shaped support frame 4 is connected to a lower pressure plate 6. The upper surface of the C-shaped support frame 4 is fixedly connected to two second hydraulic rods 403 on both sides. The lower ends of the telescopic ends of the two second hydraulic rods 403 pass through the C-shaped support frame 4 and are fixedly connected to the upper surface of the lower pressure plate 6. The lower surface of the lower pressure plate 6 is fixedly connected to an injection head 602. An annular pressure-resistant pad 601 is sleeved on the lower surface of the lower pressure plate 6 and on the upper outer side of the injection head 602. The two second hydraulic rods 403 are connected to a synchronizer. The two second hydraulic rods 403 synchronously drive the lower pressure plate 6 to descend, so that the annular pressure-resistant pad 601 presses down on the upper end of the inner tube 3, thereby clamping and sealing the upper and lower ends of the inner tube 3 with the annular pressure-resistant pad 601 and the pressure-resistant pad layer 103 respectively. At this time, the injection head 602 is inserted into the upper end of the inner tube 3.

[0025] Please see Figure 3 and 4A liquid storage pipe 7 is fixedly connected to the middle of the upper end face of the lower pressure plate 6. A liquid injection channel 603 is provided in the middle of the injection head 602. The upper end of the injection channel 603 is connected to the inside of the liquid storage pipe 7. An inlet hole 703 is provided on the rear end face of the liquid storage pipe 7 at the lower end of the circular push plate 702. An expansion liquid storage tank 404 is fixedly connected to the middle of the upper end face of the C-shaped support frame 4. The inlet hole 703 on the liquid storage pipe 7 is connected to the expansion liquid storage tank 404 through a delivery hose 704. A delivery pump 705 is fixedly installed on the delivery hose 704. The delivery pump 705... 05. The expansion fluid inside the expansion fluid storage tank 404 is injected into the inner tube 3 through the storage pipe 7 and the injection channel 603, and the storage pipe 7 is filled simultaneously. The upper end of the storage pipe 7 is fixedly connected to a third hydraulic rod 701. The lower end of the telescopic end of the third hydraulic rod 701 extends into the storage pipe 7 and is fixedly connected to a circular push plate 702. When the storage pipe 7 is full, the circular push plate 702 is lowered by the third hydraulic rod 701, and the expansion fluid filled in the storage pipe 7 is pushed into the inner tube 3 through the injection channel 603 for hydraulic expansion.

[0026] Please see Figure 2 The C-shaped support frame 4 has guide tubes 402 fixedly connected to both sides and the upper and lower ends of the two first hydraulic rods 401. The upper and lower ends of the middle of the outer end face of the two side clamping molds 5 are fixedly connected to guide rods 502. When the side clamping mold 5 moves laterally, it is guided by sliding along the inside of the guide tubes 402 through the guide rods 502.

[0027] Working Principle: In use, firstly, the inner tube 3 is vertically inserted into the conical inner tube positioning piece 2 on the support platform 102 for centering, and then the outer tube 301 is placed on the outside of the inner tube 3. The first hydraulic rods 401 on both sides are activated to push the side clamping mold 5 to move in opposite directions along the guide rod 502 and guide tube 402, clamping the outer tube 301 through the semi-circular mold groove 501, ensuring that the inner tube 3 is centered on the outer tube 301. Subsequently, the second hydraulic rod 403 synchronously drives the lower pressure plate 6 to move downwards, causing the annular pressure-resistant pad 601 to press against the upper end of the inner tube 3, forming a sealed cavity together with the pressure-resistant pad layer 103 of the support platform 102. At the same time, the injection head 602 is inserted into the upper port of the inner tube 3. The delivery pump 705 injects the liquid from the expansion liquid storage tank 404 into the storage tube 7 and the inner tube 3 through the delivery hose 704 and the inlet hole 703. After filling, the third hydraulic rod 701 pushes the circular injection plate 702 down quickly, instantly injecting the high-pressure liquid in the storage tube 7 into the inner tube 3 through the injection channel 603 in an impact manner, so as to achieve uniform radial expansion of the inner tube 3 and fit against the inner wall of the outer tube 301, thus completing the hydraulic expansion of the composite tube.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A composite tube impact hydraulic bulging device, comprising a base plate (1), characterized in that: A liquid receiving tank (101) is fixedly connected to the middle of the upper end of the base plate (1). A support platform (102) is fixedly connected to the middle of the inside of the liquid receiving tank (101). A conical inner tube positioning component (2) is connected to the middle of the support platform (102). An inner tube (3) is fitted into the upper end of the support platform (102) and outside the conical inner tube positioning component (2). An outer tube (301) is fitted into the upper end of the support platform (102) and outside the inner tube (3). A C-shaped support frame (4) is fixedly connected to the upper end of the base plate (1). A first hydraulic rod is fixedly connected to the lower end of the middle of both sides of the C-shaped support frame (4). (401) The telescopic ends of the two first hydraulic rods (401) extend to the inside of the C-shaped support frame (4) and are fixedly connected to the side clamping mold (5). The upper end of the inner side of the C-shaped support frame (4) is connected to the lower pressure plate (6). The lower end face of the lower pressure plate (6) is fixedly connected to the injection head (602). The upper end face of the lower pressure plate (6) is fixedly connected to the storage pipe (7). The upper end of the storage pipe (7) is fixedly connected to the third hydraulic rod (701). The lower end of the telescopic end of the third hydraulic rod (701) extends into the inside of the storage pipe (7) and is fixedly connected to the circular push plate (702).

2. The composite tube impact hydraulic bulging device according to claim 1, characterized in that: A pressure-resistant pad (103) is fixedly provided on the upper end face of the support platform (102), and the tapered inner tube positioning component (2) is fixedly connected to the upper end face of the support platform (102) by screws (201).

3. The composite tube impact hydraulic bulging device according to claim 1, characterized in that: The C-shaped support frame (4) has guide tubes (402) fixedly connected to both sides and the upper and lower ends of the two first hydraulic rods (401), and guide rods (502) are fixedly connected to the upper and lower ends of the middle part of the outer end face of the two side clamping molds (5).

4. The composite tube impact hydraulic bulging device according to claim 3, characterized in that: One end of each of the two guide rods (502) on the side clamping mold (5) extends through the inside of the two guide tubes (402) to the outside of the C-shaped support frame (4), and the inner end faces of the two side clamping molds (5) are provided with semi-circular mold grooves (501).

5. The composite tube impact hydraulic bulging device according to claim 1, characterized in that: The upper end of the C-shaped support frame (4) is fixedly connected to two sides of the middle part of the upper end face. The lower ends of the telescopic ends of the two second hydraulic rods (403) pass through the C-shaped support frame (4) and are fixedly connected to the upper end face of the lower pressure plate (6).

6. The composite tube impact hydraulic bulging device according to claim 1, characterized in that: The lower end face of the pressure plate (6) is fitted with an annular pressure-resistant pad (601) on the upper side of the injection head (602). An injection channel (603) is provided in the middle of the injection head (602). The upper end of the injection channel (603) is connected to the inside of the liquid storage tube (7). An inlet hole (703) is provided on the rear end face of the liquid storage tube (7) at the lower end of the circular push plate (702).

7. The composite tube impact hydraulic bulging device according to claim 6, characterized in that: The C-shaped support frame (4) is fixedly connected to the middle of the upper end face of the expansion liquid storage tank (404). The liquid inlet hole (703) on the liquid storage pipe (7) is connected to the expansion liquid storage tank (404) through the delivery hose (704). The delivery hose (704) is fixedly equipped with a delivery pump (705).

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