Expansion device for detecting mechanical property of pipe

Abstract

The utility model relates to the technical field of expansion devices, in particular to an expansion device for detecting the mechanical property of a pipe. According to the technical scheme, the device comprises a supporting seat and further comprises pressure applying mechanisms fixedly installed on the upper side and the lower side of the supporting seat, sealing heads for sealing the two ends of a pipe are installed on the pressure applying mechanisms, the pressure applying mechanisms drive the sealing heads to move in the pipe, and a bubble removing mechanism installed on the supporting seat is installed on the pressure applying mechanisms. And the defoaming mechanism drives the pipe to perform high-frequency vibration. The two sides of the pipe are blocked through the sealing heads, the pipe is filled with liquid, the liquid is incompressible, the pressure applied to the interior of the pipe by the liquid is the same at all points, it is guaranteed that the stress states of different positions in the pipe are kept the same, and it is guaranteed that the overall mechanical property of the pipe can be accurately reflected through measurement.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion devices, and particularly relates to an expansion device for testing the mechanical properties of pipes. Background Technique

[0002] Mechanical experiments on the expansion of pipes are carried out to evaluate their performance and reliability in actual applications. Expansion experiments can help verify whether the pipe design can meet the expected use conditions, including the ability to withstand internal pressure and external loads. These experiments can reveal the mechanical properties such as elasticity, plasticity, and strength of the pipe material, providing a basis for material selection and optimization. Expansion experiments help determine the safe working limit of the pipe under specific pressures, preventing pipe rupture or leakage caused by overpressure.

[0003] When conducting mechanical experiments on the expansion of pipes, it is necessary to ensure that the pressures received at each position inside the pipe are as equal as possible. This is because a uniform pressure distribution can ensure the accuracy and repeatability of the experimental results. If the pressure inside the pipe is uneven, the stress states at different positions will be different, which will cause the measurement results to not accurately reflect the overall mechanical properties of the pipe. Uneven pressure may cause some parts of the pipe to bear excessive stress, resulting in local deformation or damage, which does not represent the overall performance of the pipe. Content of the Utility Model

[0004] The purpose of the utility model is to propose an expansion device for testing the mechanical properties of pipes in view of the problems existing in the background technique.

[0005] The technical solution of the utility model: An expansion device for testing the mechanical properties of pipes, including a support base, and further including:

[0006] A pressure application mechanism fixedly installed on the upper and lower sides of the support base. A sealing head for sealing both ends of the pipe is installed on the pressure application mechanism. The pressure application mechanism drives the sealing head to move inside the pipe. A pump body system for filling the inside of the pipe with liquid through the sealing head is fixedly installed on the support base;

[0007] A defoaming mechanism installed on the support base, which drives the pipe to vibrate at high frequency.

[0008] Optionally, the pressure application mechanism includes hydraulic rods fixedly installed on the upper and lower sides of the support base, pressure sensors fixedly installed on the output shafts of the hydraulic rods, connection plates fixedly installed on the pressure sensors, connection seats movably installed on the connection plates, and the sealing head is fixedly installed on the connection seats.

[0009] Optionally, the sealing head includes a plug detachably installed on the connection seat, and a plurality of sealing rings are fixedly installed on the plug.

[0010] Optionally, a plurality of sleeves are rotatably mounted on the connecting plate, a plurality of buffer rods are rotatably mounted on the connecting seat, the buffer rods correspond to the sleeves one by one and are slidably connected, a spring is fixedly mounted in the sleeve, and the other end of the spring is fixedly connected to the buffer rod.

[0011] Optionally, the pump body system includes a through hole provided in the plug, a connecting elbow is fixedly mounted on the plug, an inlet and outlet liquid assembly is connected to the connecting elbow connected to the lower plug, and an exhaust and overflow assembly is connected to the connecting elbow connected to the upper plug.

[0012] Optionally, the inlet and outlet liquid assembly includes a three-way joint fixedly mounted on the connecting elbow on the lower side, two connecting pipes are fixedly mounted on the three-way joint, a first valve is fixedly mounted in the connecting pipe, a water tank is fixedly mounted on the support seat, a flushing pump and a suction pump are fixedly mounted on the water tank, the water inlet of the flushing pump is located at the bottom of the water tank, the water outlet of the flushing pump is fixedly connected to one of the connecting pipes, the water inlet of the suction pump is communicated with the other connecting pipe, and the other end of the suction pump is located at the inner top of the water tank.

[0013] Optionally, the exhaust and overflow assembly includes an overflow pipe fixedly mounted on the connecting elbow on the upper side, the other end of the overflow pipe is communicated with the water tank, a second valve is installed at one end of the overflow pipe close to the connecting elbow, and an exhaust hole is provided at the top of the water tank.

[0014] Optionally, the defoaming mechanism includes a motor fixedly mounted on the support seat, a first gear fixedly mounted on the output shaft of the motor, a bushing movably mounted on the support seat, a transmission shaft is rotatably mounted in the bushing, a second gear is eccentrically fixedly mounted at one end of the transmission shaft, the first gear and the second gear are meshed with each other, a connecting sleeve is detachably mounted at the other end of the transmission shaft, a fastening sleeve is detachably mounted on the connecting sleeve, and rubber pads are fixedly mounted in both the fastening sleeve and the connecting sleeve.

[0015] In summary, the present application includes at least one of the following beneficial technical effects:

[0016] The utility model seals both sides of the pipe through the sealing head, fills the inside of the pipe with liquid, and the liquid is incompressible. The pressure exerted by the liquid on the inside of the pipe is the same at each point, ensuring that the stress states at different positions inside the pipe are the same, and ensuring that the measurement can accurately reflect the overall mechanical properties of the pipe.

[0017] Furthermore, by vibrating the pipe, it helps the bubbles rise to the liquid surface and escape, preventing bubbles from forming in the liquid entering the pipe, avoiding the uneven pressure distribution inside the pipe caused by bubbles, and preventing the bubbles from being compressed or displaced during the pipe expansion process, thereby preventing the bubbles from interfering with the true expansion data. Brief Description of the Drawings

[0018] Figure 1 The structural schematic diagram of the expansion device of the present utility model is given Figure 1 ;

[0019] Figure 2 The structural schematic diagram of the expansion device of the present utility model is given Figure 2 ;

[0020] Figure 3 The structural schematic diagram of the expansion device of the present utility model is given Figure 3 ;

[0021] Figure 4 It is the structural schematic diagram of the spring of the present utility model;

[0022] Figure 5 It is the structural schematic diagram of the bubble removal mechanism of the present utility model;

[0023] Figure 6 It is the structural schematic diagram of the pressure applying mechanism of the present utility model.

[0024] Reference Signs: 1, support base; 2, hydraulic rod; 201, pressure sensor; 202, connecting plate; 203, connecting seat; 204, plug; 205, sealing ring; 206, sleeve; 207, buffer rod; 208, spring; 3, through hole; 301, connecting elbow; 302, tee joint; 303, connecting pipe; 304, first valve; 305, water tank; 306, flushing pump; 307, suction pump; 308, overflow pipe; 309, second valve; 4, motor; 401, first gear; 402, bushing; 403, transmission shaft; 404, second gear; 405, connecting sleeve; 406, fastening sleeve; 407, rubber pad. Detailed Description of the Invention

[0025] The technical solution of the present utility model will be further described below in conjunction with the drawings and specific embodiments.

[0026] Embodiment

[0027] As Figures 1-4 and Figure 6As shown in the figure, an expansion device for testing the mechanical properties of pipes proposed by the present utility model includes a support base 1, and further includes a pressure application mechanism fixedly installed on the upper and lower sides of the support base 1. A sealing head for sealing both ends of the pipe is installed on the pressure application mechanism. The pressure application mechanism drives the sealing head to move inside the pipe, blocks both sides of the pipe through the sealing head, and fills the inside of the pipe with liquid. By applying pressure to the plug head through the pressure application mechanism, pressure can be applied to the liquid inside the pipe, so that the liquid applies pressure to the inner wall of the pipe, and thus the expansion performance of the pipe can be detected.

[0028] Further, the pressure application mechanism includes hydraulic rods 2 fixedly installed on the upper and lower sides of the support base 1, pressure sensors 201 fixedly installed on the output shafts of the hydraulic rods 2, and connection plates 202 fixedly installed on the pressure sensors 201. A connection seat 203 is movably installed on the connection plate 202, and the sealing head is fixedly installed on the connection seat 203. The hydraulic rod 2 can drive the connection seat 203 to move, and then drive the sealing head installed on the connection seat 203 to move, and the pressure sensor 201 detects the pressure applied by the hydraulic rod 2 on the sealing head. The sealing head includes a plug 204 detachably installed on the connection seat 203, and a plurality of sealing rings 205 are fixedly installed on the plug 204. Different plug heads can be replaced according to the inner diameters of different pipes. By inserting the plug 204 into the pipe and using the elastically deformable sealing rings 205 to block the gap between the inner wall of the pipe and the plug 204, it is ensured that the liquid entering the pipe will not leak.

[0029] Among them, a plurality of sleeves 206 are rotatably installed on the connection plate 202, and a plurality of buffer rods 207 are rotatably installed on the connection seat 203. The buffer rods 207 correspond to the sleeves 206 one by one and are slidably connected. A spring 208 is fixedly installed inside the sleeve 206, and the other end of the spring 208 is fixedly connected to the buffer rod 207. The connection plate 202 and the connection seat 203 are connected through the sleeves 206 and the buffer rods 207, and it can be ensured that the connection plate 202 and the connection seat 203 can move within a certain range.

[0030] As Figures 1-3 and Figure 6 shown in the figure, in this embodiment, a pump body system for filling the inside of the pipe with liquid through the sealing head is fixedly installed on the support base 1. The pump body system includes a through hole 3 provided on the plug 204, a connection elbow 301 fixedly installed on the plug 204. An inlet and outlet liquid component is connected to the connection elbow 301 connected to the lower plug 204, and an exhaust and overflow water component is connected to the connection elbow 301 connected to the upper plug 204. The liquid can be transported into the pipe through the inlet and outlet liquid component and can be pumped out after the test is completed. The exhaust and overflow water component can discharge the gas inside the pipe when filling the pipe with water.

[0031] Furthermore, the liquid inlet and outlet assembly includes a tee joint 302 fixedly installed on the connecting elbow 301 at the lower side. Two connecting pipes 303 are fixedly installed on the tee joint 302. A first valve 304 is fixedly installed inside the connecting pipe 303. A water tank 305 is fixedly installed on the support base 1. A flushing pump 306 and a suction pump 307 are fixedly installed on the water tank 305. The water inlet of the flushing pump 306 is located at the bottom of the water tank 305. The water outlet of the flushing pump 306 is fixedly connected to one of the connecting pipes 303. The water inlet of the suction pump 307 communicates with the other connecting pipe 303. The other end of the suction pump 307 is located at the inner top of the water tank 305. The liquid inside the water tank is conveyed to the inside of the connecting pipe 303 by the flushing pump 306. At this time, the first valve 304 on the connecting pipe 303 for water conveyance will be in an open state, and the other first valve 304 will be in a closed state. Thus, the water inside the water tank 305 can enter the inside of the pipe through the connecting pipe 303 and the plug 204 under the action of the flushing pump 306. After the test is completed, the first valve 304 connected to the suction pump 307 is opened and the first valve 304 connected to the flushing pump 306 is closed. The liquid inside the pipe is conveyed to the inside of the water tank through the suction pump 307.

[0032] Still further, the exhaust and overflow assembly includes an overflow pipe 308 fixedly installed on the connecting elbow 301 at the upper side. The other end of the overflow pipe 308 communicates with the water tank 305. A second valve 309 is installed at one end of the overflow pipe 308 close to the connecting elbow 301. An exhaust hole is provided at the top of the water tank 305. When water is conveyed inside the pipe, the second valve 309 is opened. At this time, the gas inside the pipe will be discharged through the overflow pipe 308 under the extrusion of the liquid inside the pipe, preventing a large range of bubbles from appearing inside the pipe and filling the inner bend of the pipe with liquid to ensure that the pressure received at each position inside the pipe is of equal magnitude.

[0033] As Figure 5As shown in the figure, this embodiment further includes a defoaming mechanism installed on the support base 1, and the defoaming mechanism drives the pipe to vibrate at a high frequency. Bubbles may be generated in the liquid entering the inside of the pipe. The bubbles will cause uneven pressure distribution inside the pipe. The bubbles may be compressed or moved during the expansion process of the pipe, which will interfere with the true expansion data. By vibrating the pipe, it can help the bubbles rise to the liquid surface and escape. The defoaming mechanism includes a motor 4 fixedly installed on the support base 1, a first gear 401 fixedly installed on the output shaft of the motor 4, and a bushing 402 movably installed on the support base 1. A transmission shaft 403 is rotatably installed inside the bushing 402. One end of the transmission shaft 403 is eccentrically fixedly installed with a second gear 404. The first gear 401 and the second gear 404 are meshed with each other. The other end of the transmission shaft 403 is detachably installed with a connecting sleeve 405. A fastening sleeve 406 is detachably installed on the connecting sleeve 405. Rubber pads 407 are fixedly installed inside both the fastening sleeve 406 and the connecting sleeve 405. By driving the first gear 401 to rotate with the motor 4, the second gear 404 can be driven to rotate. The rotating second gear 404 can drive the transmission shaft 403 to rotate. Since the second gear 404 is eccentrically connected to the transmission shaft 403, the rotation of the second gear 404 will drive the transmission shaft to swing, and the transmission shaft will drive the fastening sleeve 406 and the connecting sleeve 405 to vibrate. It should be noted that the connecting sleeve 405 can rotate relative to the transmission shaft 403. Since the fastening sleeve 406 and the connecting sleeve 405 are sleeved on the pipe, the pipe can be driven to vibrate, so that the bubbles in the liquid can float up and be discharged.

[0034] The working principle of this embodiment is as follows: Seal the two sides of the pipe with the sealing head. Pump the liquid inside the water tank into the inside of the connecting pipe 303 through the pumping pump 306. Drive the connecting seat 203 to move through the hydraulic rod 2, and then drive the sealing head installed on the connecting seat 203 to move. The pressure sensor 201 detects the pressure applied by the hydraulic rod 2 on the sealing head. After the test is completed, pump the liquid inside the pipe into the water tank through the suction pump 307.

[0035] Further, drive the second gear 404 to rotate with the motor 4. Since the second gear 404 is eccentrically connected to the transmission shaft 403, the rotation of the second gear 404 will drive the transmission shaft to swing, and the transmission shaft will drive the fastening sleeve 406 and the connecting sleeve 405 to vibrate, so that the pipe can be driven to vibrate, and the bubbles in the pipe liquid can float up and be discharged.

[0036] The above specific embodiments are only several alternative embodiments of the present invention. Based on the technical solution of the present invention and the relevant revelations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. An expansion device for detecting the mechanical properties of pipe materials, comprising a support base (1), characterized in that, It further includes: A pressing mechanism fixedly installed on the upper and lower sides of the support base (1). A sealing head for sealing both ends of the pipe is installed on the pressing mechanism. The pressing mechanism drives the sealing head to move inside the pipe. A pump body system for filling liquid into the pipe through the sealing head is fixedly installed on the support base (1); A defoaming mechanism installed on the support base (1), which drives the pipe to vibrate at high frequency.

2. The expansion device for detecting the mechanical properties of a pipe according to claim 1, characterized in that, The pressing mechanism includes hydraulic rods (2) fixedly installed on the upper and lower sides of the support base (1), a pressure sensor (201) fixedly installed on the output shaft of the hydraulic rod (2), and a connection disk (202) fixedly installed on the pressure sensor (201). A connection seat (203) is movably installed on the connection disk (202), and the sealing head is fixedly installed on the connection seat (203).

3. The expansion device for detecting the mechanical properties of a pipe according to claim 2, characterized in that, The sealing head includes a plug (204) detachably installed on the connection seat (203), and a plurality of sealing rings (205) are fixedly installed on the plug (204).

4. An expansion device for detecting the mechanical properties of pipes according to claim 3, characterized in that, A plurality of sleeves (206) are rotatably installed on the connection disk (202), and a plurality of buffer rods (207) are rotatably installed on the connection seat (203). The buffer rods (207) correspond to the sleeves (206) one by one and are slidably connected. A spring (208) is fixedly installed inside the sleeve (206), and the other end of the spring (208) is fixedly connected to the buffer rod (207).

5. The expansion device for detecting the mechanical properties of a pipe according to claim 4, characterized in that, The pump body system includes a through hole (3) provided on the plug (204). A connection elbow (301) is fixedly installed on the plug (204). An inlet and outlet liquid component is connected to the connection elbow (301) connected to the lower plug (204), and an exhaust and overflow water component is connected to the connection elbow (301) connected to the upper plug (204).

6. The expansion device for detecting the mechanical properties of pipes according to claim 5, characterized in that, The inlet and outlet liquid component includes a three-way joint (302) fixedly installed on the lower connection elbow (301). Two connection pipes (303) are fixedly installed on the three-way joint (302). A first valve (304) is fixedly installed inside the connection pipe (303). A water tank (305) is fixedly installed on the support base (1). A flushing pump (306) and a suction pump (307) are fixedly installed on the water tank (305). The water inlet of the flushing pump (306) is located at the bottom of the water tank (305), and the water outlet of the flushing pump (306) is fixedly connected to one of the connection pipes (303). The water inlet of the suction pump (307) is communicated with the other connection pipe (303), and the other end of the suction pump (307) is located inside the top of the water tank (305).

7. An expansion device for detecting the mechanical properties of pipes according to claim 6, characterized in that, The exhaust and overflow water component includes an overflow pipe (308) fixedly installed on the upper connection elbow (301). The other end of the overflow pipe (308) is communicated with the water tank (305). A second valve (309) is installed at one end of the overflow pipe (308) close to the connection elbow (301). An exhaust hole is provided at the top of the water tank (305).

8. An expansion device for detecting the mechanical properties of a pipe according to claim 7, characterized in that, The defoaming mechanism includes a motor (4) fixedly installed on the support base (1), a first gear (401) fixedly installed on the output shaft of the motor (4), a bushing (402) movably installed on the support base (1), a transmission shaft (403) rotatably installed in the bushing (402), a second gear (404) eccentrically and fixedly installed at one end of the transmission shaft (403), the first gear (401) and the second gear (404) being meshed with each other, a connecting sleeve (405) detachably installed at the other end of the transmission shaft (403), a fastening sleeve (406) detachably installed on the connecting sleeve (405), and rubber pads (407) fixedly installed in both the fastening sleeve (406) and the connecting sleeve (405).

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