A cold-drawn steel tube pressure detection device

Abstract

The utility model discloses a cold-drawn steel pipe pressure detection device, specifically at the technical field of pressure detection, including test water tank, the inside of test water tank is provided with filter screen, is provided with lifting unit between filter screen and test water tank, is provided with the support subassembly for supporting cold-drawn steel pipe on filter screen, the inside of test water tank still is provided with a pair of sealing mechanism, is provided with hydraulic rod no.

Description

Technical Field

[0001] This utility model relates to the field of pressure detection technology, and more specifically, to a pressure detection device for cold-drawn steel pipes. Background Technology

[0002] Steel pipes are widely used in pipeline networks for transporting fluids and powders / solids. Steel pipes are classified into seamless steel pipes and welded steel pipes according to their manufacturing process. Seamless steel pipes are further divided into hot-rolled and cold-drawn types. Before use, cold-drawn steel pipes generally require a testing device to perform a water pressure test to ensure airtightness. The core principle of the water pressure test for cold-drawn steel pipes is based on fluid statics and material tightness verification. By applying controllable internal pressure to simulate actual working conditions, the test verifies the sealing performance, structural integrity, and material continuity of the steel pipe under high pressure.

[0003] For example, the utility model with patent publication number CN218121281U discloses a pressure steel pipe weld inspection device, which includes a collection box, fixed plates are fixedly connected to both sides of the collection box, clamping devices are provided on the side of the fixed plates that are close to each other, and a steel pipe body is provided at the upper end of the collection box.

[0004] When using existing steel pipe testing devices, the water pressure test of the steel pipe requires that the inner cavity of the steel pipe be filled with water before the air tightness test can be carried out. The filling and pressurization of the water medium are both achieved by pumping equipment, and the positioning of the steel pipe is relatively cumbersome, which affects the test progress of the steel pipe pressure test.

[0005] In view of this, we have studied and improved the existing structure and its shortcomings, and provided a pressure testing device for cold-drawn steel pipes in order to achieve a more practical purpose. Utility Model Content

[0006] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that addresses the issue of pump fluid and positioning affecting the testing progress of steel pipe pressure testing in steel pipe airtightness testing.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a cold-drawn steel pipe pressure testing device, comprising a test water tank, a filter screen disposed on the inner side of the test water tank, a lifting unit disposed between the filter screen and the test water tank, a support component for supporting the cold-drawn steel pipe disposed on the filter screen, a pair of sealing mechanisms disposed on the inner side of the test water tank, a hydraulic rod disposed between the sealing mechanism and the test water tank, a water pressure testing component disposed on one of the sealing mechanisms, a pumping unit disposed on the test water tank, and the pumping unit being connected to the other sealing mechanism.

[0008] In a preferred embodiment, sliders are fixedly connected to both ends of the filter screen, and the sliders are slidably connected to the inner wall of the test water tank.

[0009] In a preferred embodiment, the lifting unit includes a hydraulic rod, which is fixedly connected to the outside of the test water tank. The piston end of the hydraulic rod is bolted to a bracket, and one end of the bracket is fixedly connected to the filter screen.

[0010] In a preferred embodiment, the support assembly includes a pair of bases, both of which are fixedly connected to the filter screen. Each base is rotatably connected to multiple rollers, and the corresponding rollers on the same pair of bases are arranged in a cross pattern.

[0011] In a preferred embodiment, the sealing mechanism includes an end cap, one end of which is fixedly connected to an inner support tube, one end of which is embedded with a sealing gasket, and an outer sleeve is fixedly connected to the outside of the end cap, the inner wall of which is embedded with a sealing ring.

[0012] In a preferred embodiment, the second hydraulic rod is fixedly connected to the outside of the test water tank, the output end of the second hydraulic rod passes through the test water tank and is fixedly connected to the end cap, and the other end of the end cap is fixedly connected to a light rod, which is slidably connected to the test water tank.

[0013] In a preferred embodiment, the water pressure detection assembly includes a detection tube, one end of which is fixedly connected to and communicates with the end cap, and the other end of which is provided with a pressure gauge and a pressure sensor.

[0014] In a preferred embodiment, the pump unit includes a water pump, the output end of which is fixedly connected to an output water pipe, one end of which is fixedly connected to and communicates with the end cap, the input end of which is fixedly connected to an input water pipe communicating with a test water tank, a filter being provided on the input water pipe, and a one-way valve being provided at the end of the output water pipe near the end cap.

[0015] In a preferred embodiment, the filter includes a filter cartridge, both ends of which are connected to the inlet water pipe via flanges, and a PP cotton filter element is fixedly connected inside the filter cartridge.

[0016] The technical effects and advantages of this utility model are as follows:

[0017] 1. The cold-drawn steel pipe pressure testing device uses a support component to support the cold-drawn steel pipe for center positioning. The descent of the filter screen can cause the cold-drawn steel pipe on the support component to be immersed in the test water tank and quickly filled with test water. The rise of the filter screen can cause the cold-drawn steel pipe to be detached from the top and quickly drained. By optimizing the water storage steps of the cold-drawn steel pipe, the progress of cold-drawn steel pipe pressure testing can be improved.

[0018] 2. In this cold-drawn steel pipe pressure testing device, the support component enables the supported cold-drawn steel pipe to achieve a center positioning effect. Then, the hydraulic rod two pushes the sealing mechanism to move axially along the cold-drawn steel pipe. The sealing mechanism can quickly seal both ends of the cold-drawn steel pipe. While ensuring the seal, the sealing mechanism can conveniently and quickly perform airtightness testing on the cold-drawn steel pipe. Attached Figure Description

[0019] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the filter screen of this utility model;

[0022] Figure 3 This is a structural schematic diagram of the support component of this utility model;

[0023] Figure 4 This is a schematic diagram of the sealing mechanism and water pressure detection component of this utility model;

[0024] Figure 5 This is a cross-sectional view of the filter of this utility model.

[0025] The attached diagram is labeled as follows: 1. Test water tank; 2. Filter screen; 3. Hydraulic rod one; 31. Bracket; 4. Support assembly; 41. Base; 42. Roller shaft; 5. Sealing mechanism; 51. End cap; 52. Inner support tube; 53. Sealing gasket; 54. Outer tube; 55. Sealing ring; 6. Hydraulic rod two; 7. Water pressure detection assembly; 71. Detection tube; 72. Pressure gauge; 73. Pressure sensor; 8. Pump unit; 81. Water pump; 82. Output water pipe; 83. Input water pipe; 84. Filter; 841. Filter cartridge; 842. PP cotton filter element; 9. Slider; 10. Check valve; 11. Smooth rod. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] See also Figures 1-5 This utility model provides a pressure testing device for cold-drawn steel pipes, including a test water tank 1.

[0028] Test tank 1 can be pre-filled with water. By pressurizing the water into the cold-drawn steel pipe, the airtightness of the cold-drawn steel pipe can be tested.

[0029] In this embodiment: a filter screen 2 is provided on the inner side of the test water tank 1.

[0030] The filter screen 2 has a porous structure and is installed inside the test water tank 1. It can filter impurities in the test water tank 1, thus avoiding damage to the pumping equipment when the water in the test water tank 1 is drawn out.

[0031] In this embodiment: a lifting unit is provided between the filter screen 2 and the test water tank 1. The lifting unit includes a hydraulic rod 3, which is fixedly connected to the outside of the test water tank 1. The piston end of the hydraulic rod 3 is connected to a bracket 31 by bolts. One end of the bracket 31 is fixedly connected to the filter screen 2. Both ends of the filter screen 2 are fixedly connected to sliders 9, which are slidably connected to the inner wall of the test water tank 1.

[0032] The extension and retraction of the hydraulic rod 3 can drive the filter screen 2 to move up and down within the test water tank 1 via the bracket 31. In this way, the filter screen 2 can support the cold-drawn steel pipe on it and move up and down. The liftable cold-drawn steel pipe can quickly fill and drain water in the test water tank 1, which can reduce the involvement of the pumping equipment for pressure testing and improve the testing progress. Since the piston end of the hydraulic rod 3 is connected to the bracket 31 by bolts, the filter screen 2 can be flexibly installed and removed from the hydraulic rod 3 via the bracket 31. By removing the filter screen 2, it is easy to clean the impurities on the filter screen 2. The inner wall of the test water tank 1 is provided with a sliding groove for the slider 9 to slide. The slider 9 sliding in the sliding groove can make the filter screen 2 more stable when moving up and down.

[0033] In this embodiment: the filter screen 2 is provided with a support component 4 for supporting the cold-drawn steel pipe. The support component 4 includes a pair of bases 41, both of which are fixedly connected to the filter screen 2. Each base 41 is rotatably connected with multiple rollers 42, and the corresponding rollers 42 on the same pair of bases 41 are arranged in a cross pattern.

[0034] In this application, at least two support components 4 can be provided on the filter screen 2, which can facilitate the balance of the support of the cold-drawn steel pipe on the filter screen 2. The roller 42 provided on the base 41 is inclined. The multiple rollers 42 are arranged in a cross manner, which can make the cylindrical cold-drawn steel pipe quickly determine the center position, which can facilitate subsequent positioning. Since the roller 42 can be rotated, the position of the cold-drawn steel pipe supported on the roller 42 can be easily adjusted laterally by human, so that the cold-drawn steel pipe is relatively centered in the test water tank 1.

[0035] In this embodiment: a pair of sealing mechanisms 5 are also provided on the inner side of the test water tank 1. The sealing mechanism 5 includes an end cap 51. An inner support tube 52 is fixedly connected to one end of the end cap 51. A sealing gasket 53 is embedded in one end of the inner support tube 52. An outer sleeve 54 is fixedly connected to the outer side of the end cap 51. A sealing ring 55 is embedded in the inner wall of the outer sleeve 54.

[0036] A pair of sealing mechanisms 5 can be used to seal both ends of the cold-drawn steel pipe for airtightness testing. The inner support tube 52 is tapered. The sealing gasket 53 on the end cap 51 is located near the maximum diameter of the inner support tube 52. In this application, the end cap 51 is provided with a sealing groove 1 for sealing the sealing gasket 53, and the outer tube 54 is provided with a sealing groove 2 for sealing the sealing ring 55. It is worth noting that the sealing gasket 53 and the sealing ring 55 are embedded in the corresponding sealing grooves and have the effect of preventing them from falling off. This prevents them from falling off when the sealing mechanism 5 is removed from the cold-drawn steel pipe, so that they can be used for sealing in the future.

[0037] When the area between the outer sleeve 54 and the inner support tube 52 is close to one end of the cold-drawn steel pipe, the outer wall of the cold-drawn steel pipe can slide and fit against the sealing ring 55, while the end of the cold-drawn steel pipe can be released from the sealing gasket 53. Under the thrust of the end cap 51, the end of the cold-drawn steel pipe can be sealed and pressed tightly against the sealing gasket 53, thus forming a first sealing contact surface. When the cold-drawn steel pipe expands under the action of internal pressure, the expanded outer wall of the cold-drawn steel pipe can come into close contact with the sealing ring 55, thus forming a second sealing contact surface, so as to achieve rapid sealing of the end of the cold-drawn steel pipe.

[0038] It is worth noting that, since the sealing mechanism 5 is located inside the test water tank 1, and considering that the filter screen 2 moves longitudinally within the test water tank 1, clearance grooves can be provided at both ends of the filter screen 2 to facilitate the passage of the sealing mechanism 5.

[0039] In this embodiment: the hydraulic rod 6 is fixedly connected to the outside of the test water tank 1. The output end of the hydraulic rod 6 passes through the test water tank 1 and is fixedly connected to the end cover 51. The other end of the end cover 51 is fixedly connected to the light rod 11, which is slidably connected to the test water tank 1.

[0040] The extension and retraction of the piston of the hydraulic rod 6 provides traction force to the end cap 51, so that the end cap 51 can drive the outer sleeve 54, sealing ring 55 and sealing gasket 53 on it to move toward or away from the port of the cold-drawn steel pipe. This allows for quick sealing and opening of the cold-drawn steel pipe. The bare rod 11 provides sliding guidance for the moving end cap 51, making the movement of the sealing mechanism 5 more stable. In order to avoid water leakage at the connection between the bare rod 11 and the test water tank 1, a sealing element can be set at the connection between the bare rod 11 and the test water tank 1 for sliding sealing treatment. The sealing element can be a new type of combined sealing ring, which is composed of at least two coaxial stepped sealing rings and O-rings. This can take into account both wear resistance and sealing performance, and ensure the sealing of the bare rod 11 slidingly connected to the test water tank 1.

[0041] In this embodiment: a water pressure detection component 7 is provided on one of the sealing mechanisms 5. The water pressure detection component 7 includes a detection tube 71. One end of the detection tube 71 is fixedly connected to and communicates with the end cap 51. A pressure gauge 72 is provided on the other end of the detection tube 71. A pressure sensor 73 is provided on the detection tube 71.

[0042] The pressure sensor 73 is model DLK210. The detection end of the pressure sensor 73 extends into the detection tube 71. The pressure gauge 72 is a general standard part or a component known to those skilled in the art. One end of the detection tube 71 is coaxially mounted on the end cap 51. When the sealing mechanism 5 seals the port of the cold-drawn steel pipe, the cold-drawn steel pipe cavity is pressurized. Because the detection tube 71 is connected to the cold-drawn steel pipe through the end cap 51, both the pressure sensor 73 and the pressure gauge 72 can test the water pressure data inside the cold-drawn steel pipe through the detection tube 71. Since the pressure sensor 73 is an electronic component, to prevent the pressure sensor 73 from being submerged in water, the water level in the test tank 1 is higher than the highest point of the outer sleeve 54 and lower than the position of the pressure sensor 73.

[0043] In this embodiment: a pump unit 8 is provided on the test water tank 1. The pump unit 8 is connected to another sealing mechanism 5. The pump unit 8 includes a water pump 81. The output end of the water pump 81 is fixedly connected to an output water pipe 82. One end of the output water pipe 82 is fixedly connected to and communicates with the end cap 51. The input end of the water pump 81 is fixedly connected to an input water pipe 83 that communicates with the test water tank 1. A filter 84 is provided on the input water pipe 83. A one-way valve 10 is provided at the end of the output water pipe 82 near the end cap 51.

[0044] The output water pipe 82 in this application can also be equipped with a pressure sensor 73 and a pressure gauge 72. In this way, the pressure sensor 73 and pressure gauge 72 on the output water pipe 82 can detect the water supply pressure through the output water pipe 82. Furthermore, a pressure relief valve can be installed on the output water pipe 82. When the pressure test of the cold-drawn steel pipe is stopped, the pressure relief valve can be opened to safely relieve the pressure on the cold-drawn steel pipe.

[0045] Start the water pump 81. The water pump 81 can draw water from the test water tank 1 through the input water pipe 83 and pump it into the output water pipe 82. The water in the output water pipe 82 can be unidirectionally input into the inner support pipe 52 through the one-way valve 10. In this way, the water supply pressure can be used to perform an airtight pressure test on the cold-drawn steel pipe.

[0046] In this embodiment: the filter 84 includes a filter cartridge 841, the two ends of which are connected to the inlet water pipe 83 through flanges, and a PP cotton filter element 842 is fixedly connected inside the filter cartridge 841.

[0047] The PP cotton filter element 842 installed in the filter cartridge 841 can be in multiple sets. Since the water pump 81 needs to draw water from the test water tank 1 through the inlet water pipe 83, the water passing through the inlet water pipe 83 can be filtered and impurities removed by multiple sets of PP cotton filter elements 842. This makes the operation of the water pump 81 safer. Also, since the filter cartridge 841 is flanged and connected to the inlet water pipe 83, the filter cartridge 841 can be easily disassembled to clean the PP cotton filter element 842.

[0048] All electrical components mentioned in the text are electrically connected to the main controller and power supply. The main controller can be a conventional known device such as a computer that is used for control, and the existing publicly available power connection technology will not be elaborated in the text.

Claims

1. A pressure testing device for cold-drawn steel pipes, comprising a test water tank (1), characterized in that: The test water tank (1) is provided with a filter screen (2) on its inner side. A lifting unit is provided between the filter screen (2) and the test water tank (1). A support component (4) for supporting the cold-drawn steel pipe is provided on the filter screen (2). A pair of sealing mechanisms (5) are also provided on the inner side of the test water tank (1). A hydraulic rod (6) is provided between the sealing mechanism (5) and the test water tank (1). A water pressure detection component (7) is provided on one of the sealing mechanisms (5). A pump unit (8) is provided on the test water tank (1). The pump unit (8) is connected to the other sealing mechanism (5).

2. The pressure testing device for cold-drawn steel pipes according to claim 1, characterized in that: Both ends of the filter screen (2) are fixedly connected to sliders (9), which are slidably connected to the inner wall of the test water tank (1).

3. The pressure testing device for cold-drawn steel pipes according to claim 1, characterized in that: The lifting unit includes a hydraulic rod (3), which is fixedly connected to the outside of the test water tank (1). The piston end of the hydraulic rod (3) is connected to a bracket (31) by bolts, and one end of the bracket (31) is fixedly connected to the filter screen (2).

4. The pressure testing device for cold-drawn steel pipes according to claim 1, characterized in that: The support assembly (4) includes a pair of bases (41), both of which are fixedly connected to the filter screen (2). Each base (41) is rotatably connected to multiple rollers (42), and the corresponding rollers (42) on the same pair of bases (41) are arranged in a cross pattern.

5. The pressure testing device for cold-drawn steel pipes according to claim 1, characterized in that: The sealing mechanism (5) includes an end cap (51), one end of which is fixedly connected to an inner support tube (52), one end of which is embedded with a sealing gasket (53), and an outer sleeve (54) fixedly connected to the outside of the end cap (51), with a sealing ring (55) embedded in the inner wall of the outer sleeve (54).

6. The pressure testing device for cold-drawn steel pipes according to claim 5, characterized in that: The hydraulic rod 2 (6) is fixedly connected to the outside of the test water tank (1). The output end of the hydraulic rod 2 (6) passes through the test water tank (1) and is fixedly connected to the end cap (51). The other end of the end cap (51) is fixedly connected to a light rod (11), which is slidably connected to the test water tank (1).

7. The pressure testing device for cold-drawn steel pipes according to claim 5, characterized in that: The water pressure detection assembly (7) includes a detection tube (71), one end of which is fixedly connected to and communicates with the end cap (51), and the other end of which is provided with a pressure gauge (72) and a pressure sensor (73).

8. The pressure testing device for cold-drawn steel pipes according to claim 5, characterized in that: The pump unit (8) includes a water pump (81), the output end of which is fixedly connected to an output water pipe (82), one end of which is fixedly connected to and communicates with the end cap (51), the input end of which is fixedly connected to an input water pipe (83) that communicates with the test water tank (1), a filter (84) is provided on the input water pipe (83), and a one-way valve (10) is provided at the end of the output water pipe (82) near the end cap (51).

9. A pressure testing device for cold-drawn steel pipes according to claim 8, characterized in that: The filter (84) includes a filter cartridge (841), the two ends of which are connected to the inlet water pipe (83) via flanges, and a PP cotton filter element (842) is fixedly connected inside the filter cartridge (841).

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