A multi-specification corrugated pipe pressure testing mechanism

Abstract

The utility model discloses a kind of multi-specification bellows pressure test mechanism, including pressure test frame and two pressure test tables etc., sealing assembly is equipped on each pressure test table, mainly including push plate driving device, push plate driven by push plate driving device and move along axial direction, and sealing gasket fixed on the push plate, limit plate is correspondingly equipped on each pressure test table, and located the outside of sealing gasket, by detachably buckled together upper and lower limit plate, limit hole formed by half groove buckling is equipped between upper and lower limit plate. Thus, when two pressure test tables move towards, the flange of the both ends of the to-be-measured bellows is contained in limit hole, and is compressed on corresponding sealing gasket, to form sealed chamber in the inside of the to-be-measured bellows, prepare for subsequent water immersion pressure test. The above structure design effectively overcomes the defects of poor universality, inconvenient axial adjustment and insufficient sealing reliability in the prior art, and can efficiently and reliably complete pressure test of bellows of different specifications and lengths.

Description

Technical Field

[0001] This utility model relates to a pressure testing mechanism, specifically a multi-specification bellows pressure testing mechanism. Background Technology

[0002] As a flexible thin-walled shell component, bellows plays a crucial role in thermal compensation, vibration isolation, and sealing connections of pipeline systems due to its excellent expansion and contraction properties. Its core function is to compensate for axial, lateral, and angular displacements caused by thermal expansion and contraction or installation errors. To ensure the safety and sealing performance of this component under pressure conditions, pressure testing before delivery is an essential quality control step. Currently, pressure testing of bellows of various specifications commonly uses a temporary flange blind plate sealing method for specific pipe diameters. This traditional method has significant limitations: First, it lacks versatility, requiring the prefabrication and storage of a large number of sealing components and fixtures of different specifications, resulting in cumbersome and costly tooling management; second, it lacks axial adjustment capability, making it difficult to quickly and accurately adapt to bellows of different lengths, leading to long test preparation cycles, low efficiency, and high overall costs; finally, sealing reliability heavily depends on the operator's experience and assembly force, resulting in poor consistency and potential safety hazards. Therefore, there is an urgent need in this field for a dedicated pressure testing mechanism that is versatile, provides reliable sealing, and is easy to operate to overcome the above-mentioned technical deficiencies. Utility Model Content

[0003] This invention provides a multi-specification bellows pressure testing mechanism to solve the problems of low testing efficiency and safety hazards caused by poor versatility, inconvenient axial adjustment and insufficient sealing reliability in the prior art.

[0004] The technical problem of this utility model is solved by the following technical solution: A multi-specification bellows pressure testing mechanism includes a pressure testing frame and two pressure testing platforms arranged side-by-side on the frame. The two pressure testing platforms are driven to move axially towards or away from each other along the frame. The mechanism also includes two sealing assemblies, each disposed on one of the two pressure testing platforms. Each sealing assembly includes a push plate driving device, a push plate driven by the push plate driving device to move axially, and a sealing gasket fixed to the push plate. Two limiting plates are respectively disposed on the two pressure testing platforms and located outside the sealing gasket. The plate consists of an upper limit plate and a lower limit plate that are detachably fastened together. Half-grooves are provided on the opposite surfaces of the upper and lower limit plates. When the upper and lower limit plates are fastened together, the half-grooves together form a limiting hole for accommodating the end flange of the bellows to be tested. When the two test benches move towards each other, the flanges at both ends of the bellows to be tested are accommodated within the limiting hole, and the push plate driven by the push plate drive device presses against the corresponding sealing gasket, thereby forming a sealed chamber inside the bellows to be tested.

[0005] The diameter of the limiting hole is larger than the diameter of the bellows to be tested but smaller than the outer circumferential diameter of the flange.

[0006] The pressure testing mechanism is equipped with multiple sets of upper and lower limit plates with different sizes of half-grooves. By changing different combinations of upper and lower limit plates, it can be adapted to corrugated pipes of different specifications to be tested.

[0007] It also includes a water tank and a lifting drive device. The test frame is installed above the water tank via the lifting drive device, and the lifting drive device drives the test frame and its components to move into or out of the water tank as a whole.

[0008] The lifting drive device includes a mounting plate installed on the top of the water tank and a lifting hydraulic cylinder set on the mounting plate. The lifting hydraulic cylinder is connected to the test frame and drives the test frame to move up and down relative to the mounting plate to move into or out of the water tank.

[0009] The test frame is equipped with a guide screw, and the bottom of the two test platforms is equipped with rollers that travel on the test frame. The two test platforms are movably mounted on the guide screw via sliders with sliding holes. The test platforms are driven manually or electrically to move on the test frame via the rollers and along the axial direction of the guide screw.

[0010] Multiple pairs of limiting nuts are screwed onto the guide screw. By adjusting and tightening the position of the limiting nuts on the guide screw, the relative movement range between the two test pressure tables is limited according to the length of the bellows to be tested after sealing.

[0011] The pressure testing platform includes a base plate, two side plates and a rear plate mounted on the base plate, a push plate drive device mounted on the rear plate, a slider with sliding holes mounted on the bottom of the base plate, and slots for the detachable installation of the limiting plate provided on the front side of the two side plates.

[0012] The slot includes a baffle mounted on the front side of the side panel and a fixing plate mounted on the inner side of the side panel, forming a slot between the fixing plate and the baffle.

[0013] Compared with the prior art, the improvement of this utility model lies in the coordinated arrangement of two pressure testing platforms, their sealing components, and limiting plates. Specifically, each pressure testing platform is equipped with a sealing component, which includes a push plate driving device, a push plate driven by the push plate driving device to move axially, and a sealing gasket fixed to the push plate. A limiting plate is correspondingly disposed on each pressure testing platform and located outside the sealing gasket. The limiting plate consists of an upper limiting plate and a lower limiting plate that are detachably fastened together, and each of the upper and lower limiting plates has a semi-groove on its opposite surface. When the upper and lower limiting plates are fastened together, the semi-groove together form a limiting hole for accommodating the flange at the end of the bellows to be tested. Thus, when the two pressure testing platforms move towards each other, the flanges at both ends of the bellows to be tested are accommodated in the limiting hole and pressed against the corresponding sealing gasket, thereby forming a sealed chamber inside the bellows to be tested, preparing for subsequent immersion pressure testing. The above structural design effectively overcomes the shortcomings of existing technologies, such as poor versatility, inconvenient axial adjustment, and insufficient sealing reliability, thereby enabling efficient and reliable pressure testing of bellows of different specifications and lengths. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 for Figure 1 Top view.

[0016] Figure 3 for Figure 1 The left view.

[0017] Figure 4 for Figure 1 A three-dimensional image.

[0018] Figure 5 for Figure 1 A schematic diagram of the structure after removing the water tank and the corrugated pipe to be tested.

[0019] Figure 6 for Figure 5 Top view.

[0020] Figure 7 for Figure 5 The left view.

[0021] Figure 8 for Figure 5 A three-dimensional image. Detailed Implementation

[0022] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0023] like Figures 1-8As shown, the components are: 1. Test frame, 11. Guide screw, 12. Limit nut, 2. Test platform, 21. Base plate, 22. Side plate, 23. Rear plate, 24. Baffle, 25. Fixing plate, 3. Water tank, 4. Bellows to be tested, 41. Flange, 5. Lifting drive device, 51. Mounting plate, 52. Lifting hydraulic cylinder, 6. Sealing assembly, 61. Push plate drive device, 62. Push plate, 63. Sealing gasket, 7. Limit plate, 71. Upper limit plate, 72. Lower limit plate, 73. Limit hole, 8. Slider, 9. Roller. The same labels in each figure represent the same components.

[0024] A multi-specification bellows pressure testing mechanism, such as Figures 1-4 As shown, its structure includes a test frame 1, two test platforms 2, two sealing components 6, two limiting plates 7, and a water tank 3, etc.

[0025] The test frame 1 is a rectangular frame structure with guide screws 11 arranged in parallel on both sides. Two test platforms 2 are arranged side by side on the test frame 1 and can move towards or away from each other along its length.

[0026] Each test bench 2 includes a base plate 21, and two side plates 22 and a rear plate 23 fixedly installed on the base plate, thus forming a working cavity that is enclosed on three sides and open at the front.

[0027] To enable movement, the bottom of the base plate 21 is equipped with multiple rollers 9 and sliders 8 with sliding holes. The test pressure table 2 can be movably mounted on the guide screw 11 through the sliding holes of the sliders 8 and supported on the test pressure frame 1 by the rollers 9. Thus, the test pressure table 2 can be moved smoothly along the axial direction of the guide screw 11 by manual or electric drive.

[0028] To precisely control the movement range, multiple pairs of limiting nuts 12 are screwed onto the guide screw 11. The relative positions of the two test pressure tables 2 can be limited by adjusting and tightening the position of the limiting nuts 12 on the guide screw 11, and the relative movement range between the two test pressure tables 2 can be limited according to the length of the bellows 4 to be tested.

[0029] Then, the two sealing components 6 are respectively housed in the working cavities of the two pressure test benches 2, such as Figure 8 As shown, each sealing assembly 6 includes a push plate drive device 61, a push plate 62 driven by the push plate drive device to move axially, and a sealing gasket 63 fixed on the push plate. The push plate drive device 61 is fixedly installed on the rear plate 23 of the pressure test bench 2. In this embodiment, a push plate hydraulic cylinder can be used as the push plate drive device 61, and the sealing gasket 63 is preferably made of rubber.

[0030] Two limiting plates 7 are respectively set at the front open part of the two pressure test benches 2 and are located on the outside of the sealing gasket 63. Each limiting plate 7 has a limiting hole 73, the size of which is set so that the hole diameter is larger than the pipe diameter of the bellows 4 to be tested but smaller than the outer circumferential diameter of the flange 41.

[0031] The limiting plate 7 in this embodiment is as follows: Figure 8 As shown, it consists of an upper limit plate 71 and a lower limit plate 72 that are detachably installed on the pressure test bench 2 and fastened together. Specifically, slots are provided on the front side of the two side plates 22 of the pressure test bench 2. These slots consist of a baffle 24 installed on the front side of the side plate and a fixing plate 25 installed on the inner side of the side plate, so that the upper and lower limit plates can be installed and fixed through these slots.

[0032] Meanwhile, half-grooves are machined on the opposite surfaces of the upper and lower limit plates. When the upper limit plate 71 is disengaged from the lower limit plate 72, the flange 41 at the end of the corrugated pipe 4 to be tested can pass through the half-grooves. When the upper limit plate 71 and the lower limit plate 72 are engaged, the two half-grooves together form a limiting hole that restricts the flange 41 at the end of the corrugated pipe 4 to be tested from disengaging. Therefore, by equipping and replacing multiple sets of upper and lower limit plates with half-grooves of different sizes, the diameter of the limiting hole 73 can be adjusted to adapt to corrugated pipes 4 of different specifications.

[0033] Of course, a single limiting plate 7 can be used directly. In this case, the limiting hole 73 can be designed as an adjustable through hole. Alternatively, three or four limiting plates can be used to form the limiting hole 73, depending on the actual situation. This can also achieve the purpose of use. In this embodiment, two limiting plates are preferred, namely the upper limiting plate 71 and the lower limiting plate 72. Similarly, if the left or right limiting plate is selected, the same purpose of use can be achieved.

[0034] The test frame 1 is installed above the water tank 3 via a lifting drive device 5. The lifting drive device 5 includes a mounting plate 51 installed on the top of the water tank 3 and a lifting hydraulic cylinder 52 mounted on the mounting plate. The lifting hydraulic cylinder is connected to the test frame 1, that is, the output end of the lifting hydraulic cylinder 52 is connected to the test frame 1. Therefore, the lifting hydraulic cylinder 52 can drive the test frame 1 to move up and down relative to the mounting plate 51, thereby moving the test frame 1 and its components into or out of the water tank 3 as a whole to achieve immersion pressure testing.

[0035] The working process of this utility model is as follows: Preparation stage: The test pressure frame 1 is lifted out of the water tank 3 by the lifting drive device 5. According to the pipe diameter of the corrugated pipe 4 to be tested, the corresponding limiting plate 7 of the limiting hole 73 is selected and installed. At this time, the two test pressure tables 2 need to move in opposite directions to leave enough space to facilitate the installation of the corrugated pipe 4 to be tested. The specific installation method is as follows: the upper limiting plate 71 is disengaged from the lower limiting plate 72 to open the half groove. At this time, the flange 41 at the end of the corrugated pipe 4 to be tested can pass through the half groove and enter between the sealing gasket 63 and the limiting plate 7. Then the upper limiting plate 71 and the lower limiting plate 72 are fastened together so that the limiting hole 73 formed by the two half grooves fits perfectly and is fitted on the outside of the corrugated pipe 4 to be tested, but the flange 41 will not be disengaged from the limiting hole 73. That is, the fastened half grooves together form a limiting hole 73 for accommodating the flange 41 at the end of the corrugated pipe 4 to be tested.

[0036] Sealing stage: After driving the two test pressure plates 2 to move towards each other to a suitable position, adjust and tighten the limit nut 12 on the guide screw 11 to lock the position of the two test pressure plates 2 so that the flanges 41 at both ends of the bellows 4 to be tested are just accommodated in the limit hole 73. Then start the push plate drive device 61 so that the push plate 62 with the sealing gasket 63 and the limit plate 7 together clamp the flange 41 of the bellows 4 to be tested, so that the flange 41 can be pressed on the corresponding sealing gasket 63, thereby forming a sealed chamber inside the bellows 4 to be tested.

[0037] Testing Phase: Test pressure gas is injected into the sealed chamber of the bellows 4 to be tested. Then, the test frame 1 is lowered using the lifting drive device 5, so that the sealed bellows 4 to be tested is completely submerged in the water in the water tank 3. Observe whether air bubbles are generated: if so, the product is deemed unqualified for sealing; if not, it is deemed qualified.

[0038] Completion stage: After the test is completed, the test pressure frame 1 is lifted off the water tank 3 by the lifting drive device 5, the push plate 62 is opened by the push plate drive device 61, the upper limit plate 71 is removed, and then the two test pressure tables 2 are driven to move in opposite directions. The tested bellows can then be removed and the next test can be prepared.

[0039] In this way, the above-mentioned pressure testing mechanism effectively overcomes the shortcomings of existing technologies, such as poor versatility, inconvenient axial adjustment, and insufficient sealing reliability, thereby enabling it to efficiently and reliably complete pressure tests on bellows of different specifications and lengths.

[0040] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A multi-specification bellows pressure testing mechanism, comprising a pressure testing frame (1) and two pressure testing platforms (2) arranged side by side on the pressure testing frame (1), wherein the two pressure testing platforms are driven to move axially towards or away from each other along the pressure testing frame (1), characterized in that, It also includes two sealing components (6), which are respectively set on the two test pressure tables (2). Each sealing component (6) includes a push plate drive device (61), a push plate (62) driven by the push plate drive device (61) to move axially, and a sealing gasket (63) fixed on the push plate. Two limiting plates (7) are respectively set on the two test pressure tables (2) and located outside the sealing gasket (63). The limiting plate (7) is composed of an upper limiting plate (71) and a lower limiting plate (72) that are detachably fastened together. Half grooves are provided on the opposite surfaces of the upper limiting plate (71) and the lower limiting plate (72). When the upper limiting plate (71) and the lower limiting plate (72) are fastened together, the half grooves together form a limiting hole (73) for accommodating the end flange (41) of the bellows (4) to be tested. When the two test pressure tables (2) move toward each other, the flanges (41) at both ends of the bellows (4) to be tested are accommodated in the limiting hole (73), and the push plate (62) driven by the push plate drive device (61) presses against the corresponding sealing gasket (63), thereby forming a sealed chamber inside the bellows (4) to be tested.

2. The multi-specification bellows pressure testing mechanism according to claim 1, characterized in that, The diameter of the limiting hole (73) is larger than the diameter of the bellows (4) to be tested but smaller than the outer circumferential diameter of the flange (41).

3. The multi-specification bellows pressure testing mechanism according to claim 2, characterized in that, The pressure testing mechanism is equipped with multiple sets of upper limit plates (71) and lower limit plates (72) with different sizes of half-grooves. By changing different combinations of upper limit plates (71) and lower limit plates (72), it can be adapted to corrugated pipes (4) of different specifications to be tested.

4. The multi-specification bellows pressure testing mechanism according to claim 1, characterized in that, It also includes a water tank (3) and a lifting drive device (5). The test frame (1) is installed above the water tank (3) via the lifting drive device (5). The lifting drive device (5) drives the test frame (1) and its components to move into or out of the water tank (3) as a whole.

5. The multi-specification bellows pressure testing mechanism according to claim 4, characterized in that, The lifting drive device (5) includes a mounting plate (51) installed on the top of the water tank (3) and a lifting hydraulic cylinder (52) set on the mounting plate. The lifting hydraulic cylinder is connected to the test frame (1) and drives the test frame to move up and down relative to the mounting plate (51) to move into or out of the water tank (3).

6. The multi-specification bellows pressure testing mechanism according to claim 1, characterized in that, The test frame (1) is provided with a guide screw (11), and the bottom of the two test platforms (2) is provided with rollers (9) that travel on the test frame (1). The two test platforms (2) are movably mounted on the guide screw (11) by a slider (8) with a sliding hole. The test platform (2) is driven manually or electrically to move on the test frame (1) by the rollers (9) and along the axial direction of the guide screw (11).

7. The multi-specification bellows pressure testing mechanism according to claim 6, characterized in that, Multiple pairs of limiting nuts (12) are screwed onto the guide screw (11). By adjusting and tightening the position of the limiting nuts (12) on the guide screw (11), the relative movement range between the two test benches (2) is limited according to the length of the bellows (4) after sealing.

8. A multi-specification bellows pressure testing mechanism according to claim 6, characterized in that, The test bench (2) includes a base plate (21), two side plates (22) and a rear plate (23) mounted on the base plate. The push plate drive device (61) is mounted on the rear plate (23). The slider (8) with sliding holes is mounted on the bottom of the base plate (21). The front side of the two side plates (22) is provided with slots for the detachable installation of the limiting plate (7).

9. A multi-specification bellows pressure testing mechanism according to claim 8, characterized in that, The slot includes a baffle (24) mounted on the front side of the side plate (22) and a fixing plate (25) mounted on the inner side of the side plate (22), forming a slot between the fixing plate and the baffle.

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