U-shaped pipe pressure test tool

Abstract

The utility model provides a U-shaped pipe pressure test tool, and belongs to the technical field of pressure test tools. The problem that an existing U-shaped pipe is low in pressure testing efficiency is solved. The U-shaped pipe pressure testing tool comprises a testing frame, a plurality of positioning grooves are formed in the testing frame at intervals, two pressing air cylinders and two plugging air cylinders are arranged on the testing frame, pressing blocks are fixedly connected to output shafts of the two pressing air cylinders, the pressing blocks can be plugged at notches of the positioning grooves, plugging heads are fixedly connected to output shafts of the two plugging air cylinders, and the plugging heads can be plugged at the notches of the positioning grooves. Wherein one plugging head is provided with an air inlet hole and a pressure gauge. The U-shaped pipe pressure test tool has the advantage of improving the pressure test efficiency of the U-shaped pipe.

Description

Technical Field

[0001] This utility model belongs to the field of pressure testing fixture technology, and relates to U-shaped tube pressure testing fixture. Background Technology

[0002] U-shaped pipes are common tubular devices, typically made of glass, plastic, carbon steel, stainless steel, or alloy steel. They have a U-shaped bend and are characterized by being open at both ends and connected at the bottom. After production, U-shaped pipes undergo pressure testing to ensure pipe quality.

[0003] Existing U-tube pressure testing devices, such as the self-locking heat exchanger tube single-tube pressure testing fixture disclosed in Chinese patent literature [Patent No.: 202021204039.2; Application Publication No.: CN212539973U], include a water-filling end fixture and a sealing end fixture respectively connected to both ends of the heat exchanger tube. The water-filling end fixture includes a clamping pin I, and the sealing end fixture includes a clamping pin II. The clamping pin I has a tubular through hole along its axial direction. One end of the outer wall of the clamping pin I / II has a protruding end along its radial direction, and the outer wall of the other end is threaded. A stop block is fitted on the outer side of the clamping pin I / II. An O-ring is fitted on the stop block and the protruding end of the clamping pin I. A nut is also screwed onto the threaded end of the clamping pin I / II.

[0004] This type of pressure testing fixture requires manual installation and removal of the filling and sealing ends of the heat exchange tube. The clamping pin, equipped with a stop block and an O-ring, and its component II are inserted into the heat exchange tube. The operator then manually tightens the nut, causing the tapered surface of the clamping pin to press against the O-ring, increasing the friction between the O-ring and the inner wall of the heat exchange tube. The O-ring's elastic deformation then provides a seal. In short, this type of pressure testing fixture requires manual installation and removal of the filling and sealing ends, making the operation complex, time-consuming, labor-intensive, and resulting in low pressure testing efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a U-tube pressure testing fixture, which solves the technical problem of how to improve the pressure testing efficiency of the U-tube.

[0006] The purpose of this utility model can be achieved through the following technical solution: a U-shaped tube pressure testing fixture, including a test frame, characterized in that the test frame is provided with a number of positioning slots at intervals, the test frame is provided with two clamping cylinders and two sealing cylinders, a clamping block is fixedly connected to the output shaft of each of the two clamping cylinders, the clamping block can block the slot opening of the positioning slot, and a sealing head is fixedly connected to the output shaft of each of the two sealing cylinders, one of the sealing heads is provided with an air inlet and a pressure gauge.

[0007] During pressure measurement, according to the width of the U-shaped tube, select two appropriate positioning grooves, insert both sides of the U-shaped tube into the two positioning grooves, the two pressing cylinders work to extend the output shafts, move the pressing blocks to the notch of the positioning grooves, press the U-shaped tube tightly in the positioning grooves by the pressing blocks, the two plugging cylinders work, block the ports of the U-shaped tube through the two plugging heads, the air inlet is externally connected to an air inlet pipe, introduce gas or water into the U-shaped tube to increase the pressure in the U-shaped tube, detect the pressure in the U-shaped tube through a pressure gauge. When the pressure reaches the set pressure and there is no pressure relief, it means the U-shaped tube is qualified, otherwise it is unqualified. This pressure test tooling automatically presses the U-shaped tube through two pressing cylinders, automatically plugs the ports of the U-shaped tube through two plugging cylinders. The operator only needs to place the U-shaped tube in a suitable position, reducing the frequency of manual participation, being easy to operate, and improving the pressure test efficiency of the U-shaped tube.

[0008] In the above U-shaped tube pressure test tooling, the plugging head is cylindrical, and the outer end of the plugging head has a recessed and circular sealing groove. The shapes of the plugging head and the sealing groove are matched with the U-shaped tube with a circular cross-section. A sealing ring can be set at the sealing groove, enabling the plugging head to better block the ports of the U-shaped tube.

[0009] In the above U-shaped tube pressure test tooling, one of the plugging heads has a pressure measurement hole and a communication hole. The pressure measurement hole is used to install the pressure gauge, and one end of the communication hole is located at the center of the bottom of the sealing groove, and the other end is connected to both the air inlet hole and the pressure measurement hole. This structure enables the cavity inside the U-shaped tube to be connected to the air inlet hole and the pressure measurement hole through the communication hole, allowing gas to enter the U-shaped tube and enabling the pressure gauge to measure the air pressure inside the U-shaped tube.

[0010] In the above U-shaped tube pressure test tooling, the positioning groove is semi-circular, and the pressing block has a semi-circular pressing groove. The positioning groove and the pressing groove cooperate to position the U-shaped tube. After the positioning groove and the pressing groove cooperate, they are circular, which can better press the U-shaped tube.

[0011] In the above U-shaped tube pressure test tooling, the pressing block is rectangular.

[0012] In the above U-shaped tube pressure test tooling, the test stand includes a long strip-shaped positioning bar. All the positioning grooves are arranged at intervals on the positioning bar. A first guide rail is fixedly connected to the test stand. The first guide rail is arranged opposite to the positioning bar. The two pressing cylinders are movably arranged on the first guide rail. This structure enables the position of the pressing cylinders to be adjusted, enabling the pressing cylinders to press U-shaped tubes with different widths, enabling this pressure test tooling to measure the pressure of U-shaped tubes with different widths, and improving the versatility.

[0013] In the aforementioned U-tube pressure testing fixture, the test frame further includes a U-shaped gantry frame, with the first guide rail fixedly connected to the gantry frame and positioned directly above the positioning bar. This structure allows for a reasonable arrangement of the pressure testing fixture, facilitating the placement of the U-tube by operators and improving the efficiency of U-tube pressure testing.

[0014] In the aforementioned U-tube pressure testing fixture, a second guide rail is fixedly connected to the test frame. The second guide rail is located on one side of the positioning bar, and the positioning bar, the first guide rail, and the second guide rail are parallel. Two sealing cylinders are movably mounted on the second guide rail. This structure allows the position of the sealing cylinders to be adjusted, enabling them to seal the ports of U-tubes of different widths. This allows the pressure testing fixture to test the pressure of U-tubes of different widths, improving its versatility.

[0015] Compared with the prior art, the U-shaped tube pressure testing fixture provided by this utility model has the following advantages:

[0016] 1. This pressure testing fixture automatically clamps the U-tube using two clamping cylinders and automatically seals the ends of the U-tube using two sealing cylinders. Operators only need to place the U-tube in the appropriate position, reducing the frequency of manual intervention, making operation convenient and improving the pressure testing efficiency of the U-tube.

[0017] 2. The positions of the clamping cylinder and the sealing cylinder of this pressure testing fixture are adjustable, allowing the fixture to test the pressure of U-tubes of different widths, thus improving its versatility. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this U-shaped tube pressure testing fixture, as well as an enlarged view of the sealing head.

[0019] Figure 2 This is a schematic diagram of the structure of the pressure cylinder of this pressure testing fixture.

[0020] Figure 3 This is an exploded view of the sealing head, pressure gauge, and air inlet pipe of this pressure testing fixture.

[0021] In the diagram, 1. Test frame; 1a. Positioning strip; 1b. Gantry frame; 2. Positioning groove; 3. Clamping cylinder; 4. Sealing cylinder; 5. Clamping block; 6. U-tube; 7. Sealing head; 8. Air inlet; 9. Pressure gauge; 10. Sealing groove; 11. Pressure measuring hole; 12. Connecting hole; 13. Clamping groove; 14. First guide rail; 15. Second guide rail; 16. Air inlet pipe. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] like Figure 1 As shown, the U-shaped tube 6 pressure testing fixture includes a test frame 1, a clamping cylinder 3, a sealing cylinder 4, a clamping block 5, a sealing head 7, a first guide rail 14, and a second guide rail 15.

[0024] The test frame 1 includes a long, narrow positioning strip 1a and a U-shaped gantry frame 1b. In this embodiment, ten positioning slots 2 are spaced apart on the positioning strip 1a. In actual production, the number of positioning slots 2 can be six or sixteen. A first guide rail 14 is fixedly connected to the gantry frame 1b. Two clamping cylinders 3 are movably mounted on the first guide rail 14. The first guide rail 14 is positioned opposite to the positioning strip 1a and is located directly above the positioning strip 1a. A second guide rail 15 is fixedly connected to the test frame 1 and is located on one side of the positioning strip 1a. The positioning strip 1a, the first guide rail 14, and the second guide rail 15 are parallel. Two sealing cylinders 4 are movably mounted on the second guide rail 15.

[0025] like Figure 2 As shown, a clamping block 5 is fixedly connected to the output shaft of each of the two clamping cylinders 3. The clamping block 5 is rectangular and has a semi-circular clamping groove 13. The positioning groove 2 is semi-circular. The clamping block 5 can block the opening of the positioning groove 2. The positioning groove 2 and the clamping groove 13 cooperate to position the U-shaped tube 6.

[0026] like Figure 3 As shown, both sealing cylinders 4 have sealing heads 7 fixedly connected to their output shafts for sealing the ports of the U-shaped tubes 6. The sealing heads 7 are cylindrical, and their outer ends have recessed, circular sealing grooves 10. One of the sealing heads 7 has an air inlet 8, a pressure measuring hole 11, and a connecting hole 12. A pressure gauge 9 is installed on the pressure measuring hole 11. One end of the connecting hole 12 is located at the center of the bottom of the sealing groove 10, and the other end is connected to both the air inlet 8 and the pressure measuring hole 11.

[0027] During pressure testing, two suitable positioning slots 2 are selected according to the width of the U-tube 6. The positions of the two clamping cylinders 3 and the two sealing cylinders 4 are adjusted. The operator inserts the U-tube 6 into the two positioning slots 2. The two clamping cylinders 3 operate, and the output shaft extends, causing the clamping block 5 to move to the opening of the positioning slot 2, so that the positioning slot 2 and the clamping slot 13 cooperate to position the U-tube 6. The two sealing cylinders 4 operate, blocking the port of the U-tube 6 through the two sealing heads 7. The air inlet 8 is connected to the air inlet pipe 16. Gas flows into the U-tube 6 through the air inlet pipe 16, the air inlet 8, and the connecting hole 12. The pressure gauge 9 is connected to the cavity in the U-tube 6 through the pressure measuring hole 11 and the connecting hole 12. The pressure gauge 9 tests the pressure of the gas in the U-tube 6. If the pressure reaches the set pressure and there is no pressure relief, the U-tube 6 is qualified; otherwise, it is unqualified.

[0028] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0029] Although this document frequently uses terms such as test frame 1, positioning strip 1a, gantry frame 1b, positioning groove 2, clamping cylinder 3, sealing cylinder 4, clamping block 5, U-tube 6, sealing head 7, air inlet 8, pressure gauge 9, sealing groove 10, pressure measuring hole 11, connecting hole 12, clamping groove 13, first guide rail 14, second guide rail 15, and air inlet pipe 16, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A U-tube pressure test tool, comprising a test stand (1), characterized in that, The test frame (1) is provided with several positioning slots (2) at intervals. The test frame (1) is provided with two clamping cylinders (3) and two sealing cylinders (4). The output shafts of the two clamping cylinders (3) are fixedly connected with clamping blocks (5). The clamping blocks (5) can block the slot opening of the positioning slot (2). The output shafts of the two sealing cylinders (4) are fixedly connected with sealing heads (7). One of the sealing heads (7) is provided with an air inlet (8) and a pressure gauge (9).

2. The U-tube pressure testing tool of claim 1, wherein, The sealing head (7) is cylindrical, and the outer end of the sealing head (7) has a recessed and circular sealing groove (10).

3. The U-tube pressure testing tool of claim 2, wherein, One of the sealing heads (7) has a pressure measuring hole (11) and a connecting hole (12). The pressure measuring hole (11) is used to install the pressure gauge (9). One end of the connecting hole (12) is located at the center of the bottom of the sealing groove (10), and the other end is connected to both the air inlet (8) and the pressure measuring hole (11).

4. The U-tube pressure testing tool of claim 1 or 2 or 3, wherein, The positioning groove (2) is semi-circular, and the clamping block (5) has a semi-circular clamping groove (13). The positioning groove (2) and the clamping groove (13) cooperate to position the U-shaped tube (6).

5. The U-tube pressure testing tool of claim 1 or 2 or 3, wherein, The clamping block (5) is rectangular.

6. The U-tube pressure testing tool of claim 1 or 2 or 3, wherein, The test frame (1) includes a long strip-shaped positioning bar (1a), and all the positioning slots (2) are spaced apart on the positioning bar (1a). A first guide rail (14) is fixedly connected to the test frame (1), and the first guide rail (14) is arranged opposite to the positioning bar (1a). Two clamping cylinders (3) are movably arranged on the first guide rail (14).

7. The U-tube pressure testing tool of claim 6, wherein, The test frame (1) also includes a U-shaped gantry frame (1b), and the first guide rail (14) is fixed in the gantry frame (1b) and is located directly above the positioning bar (1a).

8. The U-tube pressure testing tool of claim 6, wherein, The test frame (1) is fixedly connected to a second guide rail (15), which is located on one side of the positioning bar (1a). The positioning bar (1a), the first guide rail (14), and the second guide rail (15) are parallel to each other. The two sealing cylinders (4) are movably mounted on the second guide rail (15).

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