Quick clamping pressure test plug
By combining a truncated cone steel plug with an expansion sleeve, the problem of poor sealing and plug ejection during pressure testing of welded pipe joints is solved. This achieves rapid clamping and a safe sealing effect, and is suitable for pressure testing of welded pipe joints of various diameters.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INNER MONGOLIA FIRST MASCH GRP CORP CO LTD
- Filing Date
- 2025-05-20
- Publication Date
- 2026-06-16
AI Technical Summary
In the current technology, it is difficult to control the bolt tightening torque in the pressure test of pipe fitting welded joints, which leads to poor sealing effect or damage to the rubber plug. In addition, the expansion plug is prone to flying out and injuring people during the pressure test.
It adopts a combination structure of inverted frustum steel plug and expansion sleeve, and can be quickly clamped by tightening the handle. The expansion of the inverted frustum steel plug is used to make a tight fit with the test tube wall to form a seal, replacing the traditional bolt and nut connection.
It enables rapid clamping and sealing, reduces damage to rubber plugs, and avoids the risk of the plug flying out and injuring people during pressure testing. It is suitable for pressure testing of welded joints of pipe fittings of different diameters.
Smart Images
Figure CN224364557U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pressure testing of pipe welding joints, and is mainly applicable to pressure testing of various vehicle sealing pipes and oil and water tank flanges. Background Technology
[0002] The original technical solution involved inserting a rubber plug inside the pressure testing pipe and tightening the bolts to expand the plug, thus sealing the inner wall of the pipe. Figure 1 As shown, the torque required to tighten the bolts in this way is difficult to control. If it is too loose, the sealing effect will be poor, and if it is too tight, the rubber stopper will be damaged and air leakage will occur.
[0003] like Figure 1 As shown: The original working principle of the expansion plug is to insert the expansion plug into the pipe fitting and tighten the outer nut of the expansion plug with a wrench. After the expansion plug expands, it can seal the pipe fitting. However, the disadvantage is that the working time is long and it cannot achieve a seal quickly. After the expansion plug is tightened, it often pops out during the pressure test and causes injury. If the nut is tightened too much, the expansion plug is easy to be damaged. If it is tightened too little, it is easy to pop out. Utility Model Content
[0004] The purpose of this utility model is to provide a quick-clamping pressure test expansion plug, which can effectively solve the pressure testing of welded joints of pipe fittings of different diameters and the pressure testing of oil and water tank flanges, realize quick clamping, and at the same time solve the problem of the expansion plug flying out and causing injury during the pressure test.
[0005] This utility model is achieved through the following technical solution:
[0006] A quick-clamping and pressure-testing expansion plug includes an expansion sleeve 4, a frustum-shaped steel plug 2, a connecting bolt 3, a spring sleeve 5, a washer 6, a rivet 7, and a clamping handle 8.
[0007] The expansion sleeve 4 is a hollow cylinder, and its outer diameter before compression is the same as the inner diameter of the test tube 1; the washer 6 has a through hole in the center.
[0008] The lower end face of the expansion sleeve 4 is fixedly connected to the washer 6. The lower end face of the truncated cone steel plug 2 is threadedly connected to one end of the connecting bolt 3. The spring sleeve 5 is fitted onto the connecting bolt 3. The other end of the connecting bolt 3 is inserted into the expansion sleeve 4 and then extends out of the through hole on the washer 6. The clamping handle 8 is connected to the connecting bolt 3 on the back of the washer 6 using rivets 7 to form a test pressure expansion plug assembly.
[0009] Preferably, the lower end face of the expansion sleeve 4 is connected to the washer 6 with adhesive.
[0010] Preferably, the inverted frustum steel plug is used in conjunction with the expansion sleeve to achieve the expansion of the expansion sleeve as the inverted frustum steel plug moves forward, and is used for sealing pressure testing of test pipes and fittings of different diameters.
[0011] Preferably, the test pressure expansion plug is inserted into the test pressure tube fitting, and the clamping handle 8 is turned 90°. At this time, the inverted truncated steel plug 2 is pulled forward through the connecting bolt 3 and enters the expansion sleeve 4, squeezing and deforming the expansion sleeve 4 to ensure that the expansion sleeve 4 is tightly fitted with the inner wall of the test pressure tube to form a seal. At this time, compressed air is introduced from other inlets of the test pressure tube fitting to conduct a sealing test.
[0012] The advantages of this utility model:
[0013] This utility model mainly solves the problem of pressure testing of welded joints of pipe fittings of various diameters. At the same time, the expansion plug can be quickly clamped without repeatedly tightening bolts. The conical expansion plug achieves the effect of sealing the pipe fitting by compressing the handle and shrinking the expansion sleeve, effectively reducing damage to the rubber plug. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the original pressure testing expansion plug operation;
[0015] Figure 2 This is a diagram illustrating the assembly relationship and usage process of a quick-clamping, pressure-testing, and expansion plug. Detailed Implementation
[0016] The present invention will now be further described with reference to the accompanying drawings.
[0017] like Figure 2 As shown, the quick-clamping test pressure expansion plug includes an expansion sleeve 4, a truncated cone steel plug 2, a connecting bolt 3, a spring sleeve 5, a washer 6, a rivet 7, and a clamping handle 8.
[0018] The expansion sleeve 4 is a hollow cylinder. Before compression, its outer diameter is the same as the inner diameter of the test tube 1. It is squeezed by the inverted conical steel plug 2 to expand and form a certain friction with the test tube wall.
[0019] The lower end of the inverted conical steel plug 2 is threaded to the connecting bolt 3, and the washer 6 has a through hole in the center.
[0020] The lower end face of the expansion sleeve 4 is glued to the washer 6. The lower end face of the truncated cone steel plug 2 is threaded to one end of the connecting bolt 3. The spring sleeve 5 is fitted onto the connecting bolt 3. The other end of the connecting bolt 3 is inserted into the expansion sleeve 4 through the through hole on the washer 6. The clamping handle 8 is connected to the connecting bolt 3 on the back of the washer 6 with a rivet 7, forming a test pressure expansion plug assembly. By inserting the test pressure expansion plug into the test pressure tube fitting, the clamping handle 8 is turned 90°. At this time, the truncated cone steel plug 2 is pulled forward through the connecting bolt 3 and enters the expansion sleeve 4, compressing and deforming the expansion sleeve 4 to ensure a tight fit between the expansion sleeve 4 and the inner wall of the test pressure tube, forming a seal. Compressed air is then introduced through other inlets of the test pressure tube fitting to conduct a sealing test.
[0021] Key features of this utility model:
[0022] 1. An inverted truncated cone steel plug is used in conjunction with an expansion sleeve to achieve forward expansion of the inverted truncated cone steel plug and expansion of the expansion sleeve, which is used for sealing pressure testing of pipes and fittings of different diameters.
[0023] 2. The original bolt and nut combination has been changed to a bolt and handle combination, which simplifies operation and improves pressure testing efficiency.
[0024] The advantages of this utility model:
[0025] This utility model mainly solves the problem of pressure testing of welded joints of pipe fittings of various diameters. At the same time, the expansion plug can be quickly clamped without repeatedly tightening bolts. The inverted truncated steel plug is tightened by the clamping handle to expand the rubber sleeve to seal the pipe fitting, effectively reducing damage to the rubber plug.
Claims
1. A quick-clamping and pressure-testing expansion plug, characterized in that, Includes an expansion sleeve 4, a truncated cone steel plug 2, a connecting bolt 3, a spring sleeve 5, a washer 6, a rivet 7, and a clamping handle 8; The expansion sleeve 4 is a hollow cylinder, and its outer diameter before compression is the same as the inner diameter of the test tube 1; the washer 6 has a through hole in the center. The lower end face of the expansion sleeve 4 is fixedly connected to the washer 6. The lower end face of the truncated cone steel plug 2 is threadedly connected to one end of the connecting bolt 3. The spring sleeve 5 is fitted onto the connecting bolt 3. The other end of the connecting bolt 3 is inserted into the expansion sleeve 4 and then extends out of the through hole on the washer 6. The clamping handle 8 is connected to the connecting bolt 3 on the back of the washer 6 using rivets 7 to form a test pressure expansion plug assembly.
2. The quick-clamping and pressure-testing expansion plug as described in claim 1, characterized in that, The lower end face of the expansion sleeve 4 is connected to the washer 6 with adhesive.
3. The quick-clamping and pressure-testing expansion plug as described in claim 2, characterized in that, The inverted truncated steel plug is used in conjunction with the expansion sleeve to achieve the expansion of the expansion sleeve as the inverted truncated steel plug moves forward, and is used for sealing and pressure testing of test pipes and fittings of different diameters.
4. The quick-clamping and pressure-testing expansion plug as described in claim 3, characterized in that, The test pressure expansion plug is inserted into the test pressure tube fitting. The clamping handle 8 is turned 90°. At this time, the inverted truncated steel plug 2 is pulled forward through the connecting bolt 3 and enters the expansion sleeve 4. The expansion sleeve 4 is squeezed and deformed to ensure that the expansion sleeve 4 fits tightly with the inner wall of the test pressure tube to form a seal. At this time, compressed air is introduced from other inlets of the test pressure tube fitting to conduct a sealing test.