Water pressure bulging device for lining stainless steel pipe

Abstract

The utility model discloses a water pressure bulging device for a stainless steel lining pipe. The water pressure bulging device consists of a water pressure tank water injection cover with a hexagonal appearance, a water pressure tank and a pressure release valve, the hydraulic tank water injection cover is connected with the hydraulic tank through a hinge mechanism, and the hydraulic tank is connected with the pressure release valve through a flange. According to the device, water is injected into a lining stainless steel composite pipe sealed in a water pressure bulging cabin through a water injection opening, a stainless steel inner pipe is attached to the inner wall of a carbon steel outer pipe through water pressure, and meanwhile it is guaranteed that the axes of the inner pipe and the outer pipe are always kept consistent in the water pressure bulging process. The positioning disc arranged in the water injection cover of the water pressure tank can adapt to the composite pipes with different lengths and thicknesses, and the positioning and fixing functions are provided. And after the water pressure bulging operation is completed, the pressure release valve is used for rapidly discharging accumulated water in the groove, and the safety and convenience of equipment operation are guaranteed. According to the utility model, the quality problem caused by non-coincidence of the axes of the inner and outer pipes is effectively reduced, and the production efficiency and the finished product quality of the stainless steel lined composite pipe are improved.

Description

Technical Field

[0001] The utility model relates to a manufacturing technology of a lined stainless steel pipe, in particular to a water pressure expansion device for a lined stainless steel pipe. Background Art

[0002] The last step in the production of lined stainless steel composite pipes requires the stainless steel inner pipe to be fitted to the inner wall of the carbon steel outer pipe through hydraulic expansion. In order to meet the high-quality and high-volume production requirements of the lined stainless steel composite pipe manufacturing industry, the lined stainless steel pipe hydraulic expansion device plays an important role in this process. In order to ensure that the axis of the inner pipe and the outer pipe are always in the same straight line during the hydraulic expansion process and to improve the yield rate in the production process of lined stainless steel composite pipes, the utility model proposes a lined stainless steel pipe hydraulic expansion device. Utility Model Content

[0003] In order to improve the yield rate of lined stainless steel composite pipes during the hydraulic expansion process, the utility model provides a lined stainless steel pipe hydraulic expansion device, which can not only efficiently complete the hydraulic expansion operation of the stainless steel composite pipe, but also effectively improve the yield rate of the lined stainless steel composite pipe.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a hydraulic expansion device for lined stainless steel pipes composed of a water injection cover of a hexagonal hydraulic tank, a hexagonal hydraulic tank, and a pressure relief valve. The hydraulic expansion device for lined stainless steel pipes injects water into the lined stainless steel composite pipe sealed in the hydraulic expansion chamber through the water injection port, and uses water pressure to make the stainless steel inner pipe fit on the inner wall of the carbon steel outer pipe, while ensuring that the axis of the inner pipe and the outer pipe are always in the same straight line during the hydraulic expansion process. The positioning plate in the water injection cover of the hydraulic tank can realize the positioning and fixing function of composite pipes of different lengths and thicknesses within a certain range. After the hydraulic expansion operation is completed, the accumulated water in the tank can be discharged through the pressure relief valve connected to the hydraulic tank. The utility model effectively reduces the quality problems caused by the misalignment of the inner and outer pipe axes during the hydraulic expansion process, and improves the production efficiency of lined stainless steel composite pipes.

[0005] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0006] 1. It can complete the hydraulic expansion operation of lined stainless steel composite pipe;

[0007] 2. It has the function of fixing and positioning the lined stainless steel pipe in the water pressure expansion, effectively improving the yield rate of the lined stainless steel pipe;

[0008] 3. Simple structure, easy for later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a whole machine view of the utility model;

[0010] Figure 2 This is a view of the utility model when the water pressure tank water filling cover is opened;

[0011] Figure 3 This is a structural view of the water injection cover of the water pressure tank of the utility model;

[0012] Figure 4 It is a schematic diagram of the internal structure of the utility model.

[0013] In the figure, 1. water pressure tank water filling cover, 2. water pressure tank, 3. pressure relief valve, 4. snap mechanism, 5. water filling port, 6. positioning plate, 7. water pressure expansion chamber, 8. positioning clamp, 9. spring, 10. carbon steel outer tube, 11. stainless steel inner tube, 12. sealing gasket, 13. guide rail mechanism, 14. fixing groove. DETAILED DESCRIPTION

[0014] Figure 1 In the invention, the water pressure tank water filling cover (1) is connected to the water pressure tank (2) through a hinge mechanism, and the water pressure tank (2) is connected to the pressure relief valve (3) through a flange. The water pressure tank water filling cover (1) and the water pressure tank (2) are both hexagonal in appearance. One side of the connection between the water pressure tank water filling cover (1) and the water pressure tank (2) is hinged to realize the flip opening and closing function of the water pressure tank water filling cover (1). There are 5 buckle mechanisms (4) on the outside of one end of the hinge mechanism between the water pressure tank (2) and the water pressure tank water filling cover (1), which can play a role in fixing and pressing the water pressure tank water filling cover (1) and the water pressure tank (2) in the working state.

[0015] Figure 3 In the embodiment, the end of the water pressure tank water filling cover (1) away from the hinge mechanism is connected to the water filling port (5), and a positioning plate (6) is provided inside the hinge mechanism. The positioning plate (6) is used to ensure that the axes of the inner tube and the outer tube are always in the same straight line during the water pressure expansion process. The positioning plate (6) is connected to the inside of the water pressure tank water filling cover (1) by four springs (9), which can ensure that the positioning plate (6) can adapt to the inner lining stainless steel pipes of different lengths within a certain range. There are four positioning clips (8) on the inner plate of the positioning plate (6), and the positioning clips (8) are connected to the inner plate of the positioning plate (6) by springs, so that the positioning plate (6) can adapt to the inner lining stainless steel pipes of different thicknesses within a certain range. The outer plate of the positioning plate (6) has four guide rail mechanisms (13) to prevent the positioning plate (6) from misaligning and spinning when working in the water pressure expansion chamber (7).

[0016] Figure 4In the embodiment, the stainless steel inner tube (11) and the carbon steel outer tube (10) in a nested state are located in the hydraulic expansion chamber (7) and fixed by a fixing plate (6) and a fixing groove (14). There are sealing gaskets (12) between the hydraulic tank water filling cover (1) and the hydraulic tank (2) and between the hydraulic tank (2) and the pressure relief valve (3) to ensure the water tightness of the entire lined stainless steel pipe hydraulic expansion device during operation. During hydraulic expansion, the hydraulic tank water filling cover (1) is closed, the pressure relief valve (3) is in a closed valve state, the water pipe is connected to the water filling port (5), and water is injected into the hydraulic expansion chamber (7) until the pressure required for hydraulic expansion is reached; after the hydraulic expansion is completed, the pressure relief valve (3) is opened to discharge the residual liquid from the hydraulic expansion chamber (7), the hydraulic tank water filling cover (1) is opened, and the formed lined stainless steel pipe is taken out.

Claims

1. A hydraulic expansion device for a lined stainless steel pipe, comprising a hydraulic tank water injection cover (1), a hydraulic tank (2), and a pressure relief valve (3), wherein: The water pressure tank water filling cover (1) and the main body of the water pressure tank (2) are both hexagonal in appearance, and the two are connected by a hinge mechanism. The water pressure tank (2) and the pressure relief valve (3) are connected by a flange.

2. The hydraulic bulging device for lined stainless steel pipe according to claim 1, characterized in that: The water pressure tank water filling cover (1) and the water pressure tank (2) are both hexagonal in appearance. One side of the connection between the water pressure tank water filling cover (1) and the water pressure tank (2) is hinged to realize the flip-opening and closing function of the water pressure tank water filling cover (1). There are sealing gaskets (12) between the water pressure tank water filling cover (1) and the water pressure tank (2) and between the water pressure tank (2) and the pressure relief valve (3) to ensure the water tightness of the entire stainless steel pipe lined hydraulic expansion device during operation.

3. The hydraulic bulging device for lined stainless steel pipe according to claim 1, characterized in that: One end of the hinge mechanism of the hydraulic tank (2) is provided with five buckle mechanisms (4) on the outside and a hydraulic expansion chamber (7) on the inside.

4. The hydraulic bulging device for lined stainless steel pipe according to claim 1, characterized in that: The water pressure tank water filling cover (1) is connected to the water filling port (5) at one end away from the hinge mechanism. A positioning plate (6) is provided inside the one end of the hinge mechanism, and five buckle mechanisms (4) are provided outside. The buckle mechanisms (4) can play a role in fixing and pressing the water pressure tank water filling cover (1) and the water pressure tank (2) in a working state.

5. The hydraulic bulging device for lined stainless steel pipe according to claim 1 is characterized in that: The positioning plate (6) is used to ensure that the axes of the inner tube and the outer tube are always in the same straight line during the hydraulic expansion process. The positioning plate (6) is connected to the inside of the hydraulic tank water injection cover (1) by four springs (9), which can ensure that the positioning plate (6) can adapt to the inner lining stainless steel tubes of different lengths within a certain range.

6. The hydraulic bulging device for lined stainless steel pipe according to claim 1, characterized in that: The outer plate of the positioning plate (6) is provided with four guide rail mechanisms (13) to prevent the positioning plate (6) from being misplaced and spinning when working in the hydraulic expansion chamber (7). The inner plate of the positioning plate (6) is provided with four positioning clips (8), and the positioning clips (8) are connected to the inner plate of the positioning plate (6) by springs, so that the positioning plate (6) can adapt to the inner lining stainless steel pipes of different thicknesses within a certain range.

7. The hydraulic bulging device for lined stainless steel pipe according to claim 1, characterized in that: A fixing groove (14) is provided at one end of the hydraulic expansion chamber (7) connected to the pressure relief valve (3), and the fixing groove (14) can fix the two ends of the inner lining stainless steel pipe together with the positioning plate (6).

8. The hydraulic bulging device for lined stainless steel pipe according to claim 1, characterized in that: Before hydraulic bulging, the hydraulic tank water filling cover (1) is in an open state, and the stainless steel inner tube (11) and the carbon steel outer tube (10) in a nested state are placed in the hydraulic bulging chamber (7); during hydraulic bulging, the hydraulic tank water filling cover (1) is closed, the buckle mechanism (4) is fastened, the pressure relief valve (3) is in a closed valve state, the water pipe is connected to the water filling port (5), and water is injected into the hydraulic bulging chamber (7) until the pressure required for hydraulic bulging is reached; after the hydraulic bulging is completed, the pressure relief valve (3) is opened, the residual liquid is discharged from the hydraulic bulging chamber (7), the buckle mechanism (4) and the hydraulic tank water filling cover (1) are opened, and the formed inner lining stainless steel tube is taken out.

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