Pressure pipeline strength inspection tool

Abstract

The embodiment of the utility model provides a pressure pipeline strength detection tool, and relates to the technical field of pipeline detection. The pressure pipeline strength inspection tool comprises an expansion mechanism, a driving mechanism and a pressure gauge, the driving mechanism comprises a cavity, a piston, a piston rod, an air supply pipe, an air supply pump and a driving shaft; the piston is arranged in the cavity, the air supply pipe extends into the cavity, the end, away from the cavity, of the air supply pipe is connected with the output end of the air supply pump, the pressure gauge is installed on the air supply pipe, and the piston rod is connected with the piston and extends out of the cavity. The end, away from the cavity, of the piston rod is connected with the driving shaft, and the driving shaft is connected with the expansion mechanism and used for driving the expansion mechanism to expand. The expansion mechanism is arranged in the pressure pipeline and applies internal pressure, so that the stress state of the pipeline in actual use can be truly simulated, and the accuracy and the reliability of a detection result are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline detection technical field, specifically point to a kind of pressure pipeline strength test tool. BACKGROUND

[0002] Tool, as indispensable tool in industrial production and detection, is widely used in the manufacturing, assembly and performance testing process of various mechanical equipment and components. In the field of pressure pipeline inspection, the design and application of special tooling are particularly important. As a key component for conveying gas, liquid or other media, the quality and safety of pressure pipeline directly affect the stable operation of the entire system. To ensure that the pressure pipeline can withstand the design requirement working pressure during use, it is usually necessary to test its strength and sealing through specific test tooling to verify whether its performance meets the standard.

[0003] At present, pressure pipeline strength test tooling mostly adopts the method of applying pressure to the outer wall of the pipeline from the outside for detection. This method simulates the stress condition of the pipeline under external environment to evaluate its pressure resistance. However, in actual use, the working state of pressure pipeline is usually that the inner wall bears the pressure of medium, not the outer wall. The existing detection means differs from the real stress situation of the pipeline, which may lead to the detection result not completely reflecting the performance of the pipeline under actual operating conditions. Therefore, developing a test tooling that can more realistically simulate the pressure state of the inner wall of the pipeline has become a technical problem to be solved. SUMMARY

[0004] According to the embodiments of the utility model, a pressure pipeline strength test tooling is provided to solve the problems raised in the background technology.

[0005] In the first aspect of the utility model, a pressure pipeline strength test tooling is provided.

[0006] The pressure pipeline strength test tooling comprises an expansion mechanism, a driving mechanism and a pressure gauge; the driving mechanism comprises a cavity, a piston, a piston rod, a gas supply pipe, a gas supply pump and a driving shaft; the piston is arranged inside the cavity, the gas supply pipe extends into the cavity, one end of the gas supply pipe away from the cavity is connected with the output end of the gas supply pump, the pressure gauge is installed on the gas supply pipe, the piston rod is connected with the piston and extends out of the cavity, one end of the piston rod away from the cavity is connected with the driving shaft, the driving shaft is connected with the expansion mechanism for driving the expansion mechanism to expand.

[0007] Preferably, the expansion mechanism comprises a mounting base, an expansion assembly, connecting rods, a guide shaft and a first mounting body and a second mounting body, the cavity is fixedly connected with the mounting base, the piston rod passes through the mounting base, the connecting rods are fixedly connected with the mounting base, the guide shaft is fixedly connected with one end of the connecting rods away from the mounting base, one end of the guide shaft away from the connecting rods is fixedly connected with the first mounting body, the second mounting body is slidingly installed on the guide shaft, the driving shaft is connected with the second mounting body for driving the second mounting body to move close to or away from the first mounting body, and the expansion assembly is installed between the first mounting body and the second mounting body.

[0008] Preferably, the expansion assembly comprises a first mounting block, a second mounting block, a third mounting block, a fourth mounting block, two first support arms, two second support arms and an expansion part; the first mounting block is installed on the first mounting body, the second mounting block is installed on the second mounting body, and the third mounting block and the fourth mounting block are both installed on the expansion part; the first support arm is rotationally connected with the second mounting block, one end of the first support arm away from the second mounting block is slidingly connected with a second sliding groove on the third mounting block, the second support arm is rotationally connected with the fourth mounting block, and one end of the second support arm away from the fourth mounting block is slidingly connected with a first sliding groove on the first mounting block; the first support arm and the second support arm cross each other and are rotationally connected at the crossing.

[0009] Preferably, a pressure sensor is arranged on the expansion part.

[0010] Preferably, the number of the connecting rods and the guide shafts is five, and reinforcing frames are arranged between the five connecting rods.

[0011] Preferably, the application further comprises a bottom plate, the mounting base is fixedly connected with the bottom plate, and the upper surface of the bottom plate is provided with two support assemblies.

[0012] Preferably, the support assembly comprises a support base, two limiting plates, a sliding block and a screw rod; the support base is fixedly installed on the upper surface of the bottom plate, an inclined surface is arranged on the support base, the two limiting plates are arranged on the inclined surface, a sliding space of the support base is formed between the two limiting plates, the sliding block is slidingly installed between the two limiting plates, a support part is arranged on the sliding block, the support part is a plate body with an arc-shaped notch, the screw rod is threadedly connected with the support base, and the screw rod is rotationally connected with the sliding block.

[0013] Preferably, two rollers are arranged on the support part.

[0014] One or more technical solutions provided in the application have at least the following technical effects or advantages:

[0015] The utility model provides a kind of pressure pipeline strength test tool, by being placed in the expansion mechanism inside pressure pipeline and exerting internal pressure, the stress state of pipeline in actual use can be truly simulated, to improve the accuracy and reliability of detection result;Pressure gauge is monitored to air pressure change, in combination with appearance inspection, realizes quantitative and qualitative dual verification, ensures that detection process is scientific rigorous;In addition, the tool structure is simple, convenient to operate, applicable to different specifications pressure pipeline detection, with strong practicality.

[0016] It should be understood that the content described in the utility model part is not intended to limit the key or important features of the embodiments of the utility model, nor to limit the scope of the utility model. Other features of the utility model will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and other features, advantages and aspects of the embodiments of the present application will become more apparent upon consideration of the following detailed description, taken in conjunction with the accompanying drawings. In the drawings, like reference numerals refer to like elements, and wherein:

[0018] Figure 1 A perspective structural schematic view of pressure pipeline strength test tool according to embodiments of the utility model is shown;

[0019] Figure 2 A perspective structural schematic view of driving mechanism of pressure pipeline strength test tool according to embodiments of the utility model is shown;

[0020] Figure 3 A cross-sectional structural schematic view of driving mechanism of pressure pipeline strength test tool according to embodiments of the utility model is shown;

[0021] Figure 4 A main view structural schematic view of expansion assembly of pressure pipeline strength test tool according to embodiments of the utility model is shown;

[0022] Figure 5 An explosion structural schematic view of expansion assembly of pressure pipeline strength test tool according to embodiments of the utility model is shown;

[0023] Figure 6 A perspective structural schematic view of support assembly of pressure pipeline strength test tool according to embodiments of the utility model is shown.

[0024] Label name

[0025] 1-expansion mechanism, 11-mounting seat, 12-expansion assembly, 121-first mounting block, 1211-first sliding groove, 122-second mounting block, 123-third mounting block, 1231-second sliding groove, 124-fourth mounting block, 125-first support arm, 126-second support arm, 127-expansion part, 128-pressure sensor, 13-connecting rod, 14-guide shaft, 15-first mounting body, 16-second mounting body, 17-strengthening frame, 2-driving mechanism, 21-cavity, 22-piston, 23-piston rod, 24-gas supply pipe, 25-gas supply pump, 26-driving shaft, 4-bottom plate, 5-supporting assembly, 51-supporting seat, 52-limiting plate, 53-sliding block, 531-supporting part, 532-roller, 54-screw rod. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] In addition, the term "and / or" in this paper is only to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0028] For example, as shown in FIG. 1, the expansion mechanism 1 is arranged on the bottom plate 4, and the expansion mechanism 1 is connected with the driving mechanism 2. Figures 1 to 6As shown, the pressure pipeline strength inspection tool comprises an expansion mechanism 1, a driving mechanism 2 and a pressure gauge 3; the driving mechanism 2 comprises a cavity 21, a piston 22, a piston rod 23, a gas supply pipe 24, a gas supply pump 25 and a driving shaft 26; specifically, the cavity 21 is a housing structure with a sealed inner cavity, used to accommodate the piston 22 and provide a gas pressure driving space; the piston 22 is arranged inside the cavity 21 and can move axially along the cavity 21 under the action of gas pressure; one end of the gas supply pipe 24 extends into the inside of the cavity 21 and communicates with the sealed inner cavity of the cavity 21, and the other end is connected with the output end of the gas supply pump 25, used to deliver the gas generated by the gas supply pump 25 into the cavity 21; the pressure gauge 3 is installed on the gas supply pipe 24, used to monitor the gas pressure value in the gas supply pipe 24 in real time; one end of the piston rod 23 is fixedly connected with the piston 22, and the other end extends out of the cavity 21 and is connected with one end of the driving shaft 26; the other end of the driving shaft 26 is connected with the expansion mechanism 1, used to transmit the movement of the piston rod 23 to the expansion mechanism 1, so as to drive the expansion mechanism 1 to expand.

[0029] The use method of the pressure pipeline strength inspection tool is as follows: first, place the expansion mechanism 1 inside the pressure pipeline to be detected, and adjust the position of the tool to make the axis of the driving shaft 26 substantially coincide with the axis of the pressure pipeline, so as to ensure that the expansion mechanism 1 can uniformly act on the inner wall of the pipeline. Subsequently, start the gas supply pump 25, and fill compressed gas into the inside of the cavity 21 through the gas supply pipe 24. After the gas enters the cavity 21, it pushes the piston 22 to move axially along the cavity 21, and the piston 22 drives the driving shaft 26 to move through the piston rod 23, and the driving shaft 26 further drives the expansion mechanism 1 to expand radially. The expansion process continues until the outer surface of the expansion mechanism 1 is in close contact with the inner wall of the pressure pipeline and reaches the preset detection gas pressure value. At this time, the gas supply pump 25 is turned off, and the gas pressure in the system is kept stable.

[0030] During the detection process, the pressure change in the gas supply pipe 24 is monitored in real time through the pressure gauge 3, and a comprehensive judgment is made in combination with the appearance state of the pressure pipeline. Specifically, if the gas pressure value displayed by the pressure gauge 3 remains constant for a period of time (for example, 5 minutes), it indicates that the expansion mechanism 1 does not expand further, and the pressure resistance of the inner wall of the pressure pipeline can withstand the detection pressure, so it is determined that the pressure resistance performance is qualified; if the gas pressure value displayed by the pressure gauge 3 gradually decreases, it indicates that the expansion mechanism 1 has further expanded under the influence of the deformation of the inner wall of the pipeline, which shows that the pressure resistance of the inner wall of the pressure pipeline is insufficient, so it is determined that it is unqualified. At the same time, visual inspection or the use of measuring tools can be used to observe whether there are obvious deformations or cracks on the outside of the pressure pipeline, which can be used as an auxiliary judgment basis. If the appearance of the pipeline deforms or is damaged, it is further confirmed that the pressure resistance performance is unqualified.

[0031] By placing the expansion mechanism 1 inside the pressure pipeline and applying internal pressure, the stress state of the pipeline in actual use can be truly simulated, thereby improving the accuracy and reliability of the detection results; the pressure gauge 3 is used to monitor the change in air pressure, and combined with visual inspection, quantitative and qualitative double verification is realized to ensure that the detection process is scientific and rigorous; in addition, the tooling structure is simple, easy to operate, suitable for detection of pressure pipelines of different specifications, and has strong practicality.

[0032] The gas supply pump 25 can be a conventional bidirectional pneumatic pump or an air compressor and vacuum pump combination system. In this embodiment, the gas supply pump 25 is a conventional bidirectional pneumatic pump, and its output pressure range is 0.1 MPa to 10 MPa, which can meet the pressure requirements of pressure pipeline detection. At the same time, it has an air extraction function to ensure the rapid resetting of the system after detection is completed. In use, the gas supply pump 25 first inflates the cavity 21 through the gas supply pipe 24, pushes the piston 22 to move to drive the expansion mechanism 1 to expand to contact the inner wall of the pipeline; after detection is completed, the gas supply pump 25 switches to the air extraction mode, extracts the gas in the cavity 21, makes the expansion mechanism 1 contract and return to the initial state, and thus completes a complete detection cycle.

[0033] In this embodiment, the expansion mechanism 1 includes a mounting seat 11, expansion assemblies 12, a connecting rod 13, a guide shaft 14, a first mounting body 15, and a second mounting body 16. The number of expansion assemblies 12 is five, and the five expansion assemblies 12 are arranged in a ring-shaped equidistant array with the axis of the drive shaft 26 as the center to ensure uniform pressure on the inner wall of the pressure pipeline. The cavity 21 is fixedly connected with the mounting seat 11 by means of bolts or welding, and the piston rod 23 passes through the center through hole of the mounting seat 11 and can move axially. One end of the connecting rod 13 is fixedly connected with the mounting seat 11, and the other end is fixedly connected with one end of the guide shaft 14. The guide shaft 14 is a rod-shaped structure extending axially, and the end away from the connecting rod 13 is fixedly connected with the first mounting body 15 by means of threaded connection or pin fixing. The second mounting body 16 is slidably installed on the guide shaft 14 by means of a sliding sleeve or a bearing and can reciprocate along the axis of the guide shaft 14. One end of the drive shaft 26 is connected with the piston rod 23, and the other end is fixedly connected with the second mounting body 16, for driving the second mounting body 16 to move towards or away from the first mounting body 15 along the guide shaft 14. The expansion assemblies 12 are installed between the first mounting body 15 and the second mounting body 16, and the relative movement of the first mounting body 15 and the second mounting body 16 realizes expansion or contraction.

[0034] When the driving shaft 26 drives the second mounting body 16 to approach the first mounting body 15, the second mounting body 16 slides on the guide shaft 14 towards the first mounting body 15, and drives the expansion assembly 12 to expand radially until the outer surface of the expansion assembly 12 is in close contact with the inner wall of the pressure pipeline, and the required internal pressure is applied for detection; when the driving shaft 26 drives the second mounting body 16 to move away from the first mounting body 15, the second mounting body 16 slides reversely along the guide shaft 14, and the expansion assembly 12 gradually shrinks and returns to the initial state, thereby facilitating the removal of the tooling or the next detection.

[0035] In the embodiment, the expansion assembly 12 includes a first mounting block 121, a second mounting block 122, a third mounting block 123, a fourth mounting block 124, two first support arms 125, two second support arms 126, and an expansion part 127. Specifically, the first mounting block 121 is fixedly installed on the first mounting body 15 by bolts or buckles, the second mounting block 122 is fixedly installed on the second mounting body 16 by a similar way, the third mounting block 123 and the fourth mounting block 124 are both fixedly installed on the inner side surface of the expansion part 127 for supporting and driving the expansion part 127; the expansion part 127 is preferably an arc-shaped plate structure made of high-strength rubber or metal composite material, has certain elasticity and pressure resistance, and can be attached to the inner wall of the pressure pipeline and apply uniform pressure.

[0036] One end of the first support arm 125 is rotatably connected with the second mounting block 122 by a pin shaft or a hinge, and the other end is slidably connected with the second sliding groove 1231 provided on the third mounting block 123 by a sliding block; one end of the second support arm 126 is rotatably connected with the fourth mounting block 124 by a pin shaft or a hinge, and the other end is slidably connected with the first sliding groove 1211 provided on the first mounting block 121 by a sliding block. The first sliding groove 1211 and the second sliding groove 1231 are both straight-line grooves extending along the radial direction, and are respectively used for guiding the sliding end of the first support arm 125 and the second support arm 126 to move directionally. The first support arm 125 and the second support arm 126 intersect with each other in space, and the intersection is rotatably connected by a rotating pin or a bearing, forming a linkage mechanism similar to a pair of scissors, so as to amplify the radial displacement of the expansion part 127.

[0037] When the driving shaft 26 drives the second mounting body 16 to approach the first mounting body 15, the second mounting body 16 drives the second mounting block 122 to approach the first mounting block 121. At this time, the first supporting arm 125 rotates around the second mounting block 122 as a fulcrum, and the sliding end thereof slides outward in the second sliding groove 1231; meanwhile, the second supporting arm 126 rotates around the fourth mounting block 124 as a fulcrum, and the sliding end thereof slides outward in the first sliding groove 1211. Due to the cross-linking action of the first supporting arm 125 and the second supporting arm 126, the rotation and sliding of the two arms jointly drive the third mounting block 123 and the fourth mounting block 124 to move outward, thereby driving the expansion part 127 to move in the radial direction of the inner wall of the pressure pipeline until the expansion part 127 is in close contact with the inner wall of the pressure pipeline and exerts a predetermined pressure. At this time, the expansion assembly 12 is in a fully expanded state. Conversely, when the driving shaft 26 drives the second mounting body 16 to move away from the first mounting body 15, the sliding ends of the first supporting arm 125 and the second supporting arm 126 slide inward in the first sliding groove 1211 and the second sliding groove 1231, respectively, thereby driving the expansion part 127 to contract inward and return to the initial state.

[0038] The present embodiment realizes uniform pressure exertion on the inner wall of the pressure pipeline through the five annular arrays of the expansion assembly 12, and combines the sliding and rotating linkage mechanism of the first supporting arm 125 and the second supporting arm 126 to ensure smooth movement and uniform stress of the expansion part 127, thereby improving the detection accuracy and the reliability of the tooling.

[0039] In the present embodiment, the expansion part 127 is provided with a pressure sensor 128. The pressure sensor 128 is embedded or fixedly installed on the outer surface of the expansion part 127, and the pressure sensing surface thereof faces the direction of the inner wall of the pressure pipeline. When the expansion part 127 approaches and contacts the inner wall of the pressure pipeline under driving, the pressure sensor 128 directly contacts the inner wall of the pressure pipeline, and is used for real-time detection of the pressure value exerted by the expansion part 127 on the inner wall of the pressure pipeline. The pressure sensor 128 is preferably a thin-film pressure sensor or a resistance strain sensor, and the range thereof can be set according to the detection requirements, for example, 0 MPa to 10 MPa. The pressure sensor 128 is connected to an external display device or a control system through a wire to provide accurate pressure data, thereby assisting in judging the pressure resistance performance of the pressure pipeline.

[0040] In the embodiment, the number of the connecting rods 13 and the guide shafts 14 is five, the five connecting rods 13 are equidistantly distributed in a ring around the axis of the driving shaft 26, and the five guide shafts 14 are fixedly connected with the corresponding connecting rods 13 respectively. In order to enhance the stability of the structure, reinforcing frames 17 are arranged between the five connecting rods 13. The reinforcing frames 17 are preferably ring or polygonal frame structures made of steel or aluminum alloy, and the outer edges thereof are fixedly connected with the side surfaces of the connecting rods 13 by welding or bolts. By arranging the reinforcing frames 17, the rigidity between the connecting rods 13 can be effectively improved, the deformation or deviation caused by uneven stress during the operation of the expansion mechanism 1 can be prevented, and thus the overall stability of the detection tool can be ensured.

[0041] In the embodiment, a bottom plate 4 is further included, which is a rectangular flat plate structure made of high-strength metal material and used for bearing the whole tool. The mounting seat 11 is fixedly connected to the upper surface of the bottom plate 4 by bolts or welding, and the upper surface of the bottom plate 4 is further provided with two support assemblies 5 arranged along the axial direction of the driving shaft 26 and used for supporting and adjusting the position of the pressure pipeline to be detected.

[0042] In the embodiment, the support assembly 5 includes a support seat 51, two limiting plates 52, a sliding block 53 and a screw rod 54. Specifically, the support seat 51 is fixedly installed on the upper surface of the bottom plate 4 by bolts, the upper end of the support seat 51 is provided with an inclined surface having a certain angle with respect to the horizontal surface of the bottom plate 4 for facilitating height adjustment, the two limiting plates 52 are fixedly arranged on the inclined surface in parallel, preferably connected with the support seat 51 by screws or welding, and the gap between the two limiting plates 52 forms a sliding space, the sliding block 53 is slidingly installed in the sliding space between the two limiting plates 52, the side surface of the sliding block 53 is attached to the limiting plates 52 to ensure the stability of the sliding direction, the upper end of the sliding block 53 is provided with a support portion 531 which is a plate body with an arc-shaped notch, and the screw rod 54 is connected with the threaded hole of the support seat 51 by threads, one end of the screw rod 54 is rotatably connected with the sliding block 53 by a bearing or a rotating joint, and the other end can be provided with a handle or a knob for facilitating operation.

[0043] In use, the screw rod 54 is rotated to rotate and move axially in the threaded hole of the support base 51, thereby driving the slider 53 to slide along the inclined surface between the two limiting plates 52. Due to the inclined characteristic of the inclined surface, when the slider 53 slides upward or downward along the inclined surface, the height of the upper end of the support part 531 is raised or lowered. The support part 531 is used to support the outer wall of the pressure pipeline, and by adjusting the height of the support part 531 of the two support assemblies 5, the axis of the pressure pipeline can be kept in line with the axis of the driving shaft 26, thereby ensuring that the expansion mechanism 1 can uniformly apply pressure. The height adjustment range of the support part 531 can be adapted to pressure pipelines of different diameters.

[0044] In the embodiment, two rollers 532 are arranged in the arc-shaped notch of the support part 531. The rollers 532 are installed on the inner side of the support part 531 through a rotating shaft, and the outer surface of the roller 532 is slightly higher than the upper edge of the arc-shaped notch. The material of the roller 532 can be wear-resistant rubber or nylon to reduce friction. When the pressure pipeline is placed on the two support assemblies 5, the outer wall of the pressure pipeline is in contact with the roller 532. When it is necessary to move the pressure pipeline axially to adjust the detection position, the roller 532 rolls under the drive of the outer wall of the pressure pipeline, effectively avoiding direct sliding friction between the support part 531 and the outer wall of the pressure pipeline, thereby reducing the wear or scratch on the surface of the pipeline, and facilitating the installation and disassembly of the pipeline.

[0045] The embodiment realizes accurate monitoring of the applied pressure by arranging the pressure sensor 128 on the expansion part 127, enhances the stability of the connecting rod 13 through the reinforcing frame 17, ensures the accurate positioning and support of the pressure pipeline through the design of the bottom plate 4 and the support assembly 5, and further improves the operation convenience of the tooling and the protection effect on the pipeline through the arrangement of the roller 532, thereby optimizing the reliability and applicability of the detection process.

[0046] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A pressure pipe strength inspection tool characterized by, The utility model relates to an inflation device, which comprises an inflation mechanism (1), a driving mechanism (2) and a pressure gauge (3). The driving mechanism (2) comprises a cavity (21), a piston (22), a piston rod (23), a gas supply pipe (24), a gas supply pump (25) and a driving shaft (26); the piston (22) is arranged inside the cavity (21); the gas supply pipe (24) extends into the cavity (21); one end of the gas supply pipe (24) away from the cavity (21) is connected with the output end of the gas supply pump (25); the pressure gauge (3) is installed on the gas supply pipe (24); the piston rod (23) is connected with the piston (22) and extends out of the cavity (21); one end of the piston rod (23) away from the cavity (21) is connected with the driving shaft (26); the driving shaft (26) is connected with the inflation mechanism (1) and is used for driving the inflation mechanism (1) to expand.

2. The pressure pipe strength inspection tool of claim 1, wherein, The inflation mechanism (1) comprises a mounting base (11), an inflation assembly (12), a connecting rod (13), a guide shaft (14), a first mounting body (15) and a second mounting body (16); the cavity (21) is fixedly connected with the mounting base (11); the piston rod (23) passes through the mounting base (11); the connecting rod (13) is fixedly connected with the mounting base (11); one end of the connecting rod (13) away from the mounting base (11) is fixedly connected with the guide shaft (14); one end of the guide shaft (14) away from the connecting rod (13) is fixedly connected with the first mounting body (15); the second mounting body (16) is slidingly installed on the guide shaft (14); the driving shaft (26) is connected with the second mounting body (16) and is used for driving the second mounting body (16) to move close to or away from the first mounting body (15); the inflation assembly (12) is installed between the first mounting body (15) and the second mounting body (16).

3. The pressure pipe strength test tool of claim 2, wherein, The expansion assembly (12) comprises a first mounting block (121), a second mounting block (122), a third mounting block (123), a fourth mounting block (124), two first support arms (125), two second support arms (126) and an expansion part (127); the first mounting block (121) is mounted on the first mounting body (15), the second mounting block (122) is mounted on the second mounting body (16), the third mounting block (123) and the fourth mounting block (124) are both mounted on the expansion part (127); the first support arm (125) is rotationally connected with the second mounting block (122), one end of the first support arm (125) away from the second mounting block (122) is slidably connected with a second sliding groove (1231) on the third mounting block (123), the second support arm (126) is rotationally connected with the fourth mounting block (124), one end of the second support arm (126) away from the fourth mounting block (124) is slidably connected with a first sliding groove (1211) on the first mounting block (121), the first support arm (125) and the second support arm (126) cross each other and are rotationally connected at the crossing.

4. The pressure pipe strength inspection tool of claim 3, wherein, The expansion part (127) is provided with a pressure sensor (128).

5. The pressure pipe strength test tool of claim 2, wherein, The number of the connecting rods (13) and the guide shafts (14) is five, and the five connecting rods (13) are provided with a reinforcing frame (17).

6. The pressure pipe strength inspection tool of claim 2, wherein, A bottom plate (4) is further included, the mounting seat (11) is fixedly connected with the bottom plate (4), and the upper surface of the bottom plate (4) is provided with two support assemblies (5).

7. The pressure pipe strength inspection tool of claim 6, wherein, The support assembly (5) comprises a support seat (51), two limiting plates (52), a sliding block (53) and a screw rod (54); the support seat (51) is fixedly installed on the upper surface of the bottom plate (4), the support seat (51) is provided with an inclined surface, the two limiting plates (52) are arranged on the inclined surface, the sliding space of the support seat (51) is formed between the two limiting plates (52), the sliding block (53) is slidably installed between the two limiting plates (52), the support part (531) is arranged on the sliding block (53), the support part (531) is a plate body with an arc-shaped notch, the screw rod (54) is threadedly connected with the support seat (51), and the screw rod (54) is rotationally connected with the sliding block (53).

8. The pressure pipe strength inspection tool of claim 7, wherein, Two rollers (532) are arranged on the support part (531).

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