A testing device for the performance of a PVC pipe joint under bending internal pressure and external load resistance

Abstract

The present invention discloses a test device for the bending internal pressure and external load resistance performance of a PVC pipe interface, belonging to the technical field of rigid polyvinyl chloride pipe testing equipment. This device can repeatedly conduct tests on the bending internal pressure and external load resistance of the pipe interface. The two ends of the horizontal pipe can be fixed through the horizontal pipe fixing part, then moved and fixed towards the baffle plate direction, and then the end of the inclined pipe is fixed and sealed through the inclined pipe fixing part; through the fixation at three points in the pipe, the pipe is firmly fixed within the outer protection frame to ensure the subsequent pipe test. This device can quickly achieve three-point positioning of the pipe through the horizontal pipe fixing part and the inclined pipe fixing part, and seal both ends of the pipe to ensure that the pipe is firmly fixed during the holding test; this equipment does not require the pipe to be fixed by welding each time, reducing the preliminary work of pipe fixing, reducing the difficulty of repeated tests, and reducing the test time.

Description

Technical Field

[0001] The invention belongs to the technical field of rigid polyvinyl chloride pipe testing equipment, and particularly relates to a testing device for the bending internal pressure and external load resistance performance of PVC pipe interfaces. Background Art

[0002] Drainage pipes can be used to discharge urban sewage and are an indispensable part of the normal operation of cities. Plastic pipes have the advantages of good sanitary performance, low density, corrosion resistance, reliable connection, smooth inner wall, convenient construction, low cost, etc. Drainage pipes with small and medium diameters (DN630 and below) have been widely used in China. Among them, rigid polyvinyl chloride (PVC-U) pipes are the most common.

[0003] However, compared with concrete pipes and steel pipes, the disadvantage of PVC pipes is that they are prone to bending deformation under uneven settlement or other factors. For long-distance PVC pipes, their bending deformation mainly affects the pipe interfaces (commonly socket-and-spigot seals). When the pipe bends, the reduction of the friction force on the tensile side of the PVC pipe socket will cause the sealing performance of the seal to decline. At this time, under the action of the internal water pressure, the pipe may have leakage problems. Existing specifications mainly use the deflection test to check the sealing performance of the pipe socket. The pipe section for the test consists of two end pipes, namely a horizontally placed pipe and an obliquely placed pipe, which are connected to form an angle. The test for the leakage problem at the angle is carried out by pressurizing the pipe. The existing pipe test device is only an iron frame structure. After welding and fixing the pipe, the two ends of the pipe are directly blocked for the test. This device is troublesome to disassemble, time-consuming, and not conducive to repeated tests. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a testing device for the bending internal pressure and external load resistance performance of PVC pipe interfaces to solve the technical problems in the prior art that the welded testing device is time-consuming and laborious to install the pipe and difficult to conduct repeated tests.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention includes a horizontal pipe fixing part, an inclined pipe fixing part and an outer protective frame body. The outer protective frame body includes a slide rail. The horizontal pipe fixing part includes a base slidably arranged on the slide rail. An arc-shaped groove for bearing the lower side of the horizontal pipe is formed in the base. Arc-shaped covers are hinged at both ends of the base. The arc-shaped covers are fixed to both ends of the base by screws and form a circular hole for wrapping the outer side of the horizontal pipe. The outer end of the base is flush with the outer end of the horizontal pipe. A plurality of threaded columns are fixed to the outer end of the base. A retaining disc is fixed to the outer protective frame body. A first sealing head is arranged in the middle of the retaining disc. The retaining disc is blocked at the outer end of the base. The threaded columns pass through the retaining disc and are fixed by nuts, so that the first sealing head seals the port of the horizontal pipe. A first pressurized water pipe is also communicated and arranged in the middle of the retaining disc. The inclined pipe fixing part includes a vertical seat slidably arranged on the slide rail. A jack is fixed to the vertical seat. An inclined pipe seat is rotatably arranged at the end of the jack. An arc-shaped groove for bearing the lower side of the inclined pipe is formed in the inclined pipe seat. A seat cover is fixed to the upper side of the inclined pipe seat by screws. The seat cover and the inclined pipe seat form a circular hole for wrapping the outer side of the inclined pipe. A baffle is fixed to the outer end of the inclined pipe seat by screws. A second sealing head for sealing the outer end of the inclined pipe is fixed to the baffle. A second pressurized water pipe is also communicated and arranged on the baffle.

[0007] Furthermore, a hydraulic cylinder is fixed to the outer protective frame body. The output end of the hydraulic cylinder is fixedly connected to the base. The hydraulic cylinder pushes the base to move towards the retaining disc.

[0008] Furthermore, a driving structure is arranged inside the vertical seat. The driving structure includes a motor, a worm and a plurality of worm wheels. The output end of the motor is connected to the worm. The worm meshes with the worm wheels. A rack is arranged on the slide rail. The worm wheels mesh with transmission teeth. The transmission teeth mesh with the rack.

[0009] Furthermore, the vertical seat is simultaneously slidably arranged on four slide rails. The four slide rails are distributed at the four corners of a square. Sinking grooves are respectively formed at the four corners of the vertical seat. Rollers are rotatably arranged on the horizontal planes of the sinking grooves. The rollers are rollingly arranged on the horizontal planes of the slide rails. The motor is arranged in the middle and lower part of the vertical seat. There are two worm wheels which are respectively meshed on both sides of the worm. There are four transmission teeth which are coaxially connected in pairs. The rack is arranged on the inner side surface of the slide rail. The four transmission teeth are respectively meshed on the four racks.

[0010] Furthermore, a groove is formed in the vertical seat. Vertical sliding grooves are arranged on both side surfaces of the groove. Circular seats are arranged on both sides of the inclined pipe seat. The circular seats are slidably and rotatably arranged in the vertical sliding grooves. The diameter of the circular seats is equal to the width of the vertical sliding grooves.

[0011] Furthermore, a positioning steel plate is also fixed on the outer protection frame body, the retaining disc is fixed on one side of the positioning steel plate, and a plurality of relief holes for facilitating the tightening of nuts are formed in the positioning steel plate.

[0012] The beneficial effects of the present invention are as follows:

[0013] The present invention can quickly achieve three-point positioning of the pipeline through the horizontal pipe fixing part and the inclined pipe fixing part, and seal both ends of the pipeline to ensure that the pipeline is firmly fixed during the holding test; this device does not require the pipeline to be fixed by welding each time, reducing the preliminary work of pipeline fixing, reducing the difficulty of repeated tests, and reducing the test time.

[0014] Other advantages, objectives, and features of the present invention will be described in the subsequent description, and to some extent, they are obvious to those skilled in the art, or those skilled in the art can obtain teachings from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the objectives, technical solutions, and beneficial effects of the present invention clearer, the present invention provides the following drawings for description:

[0016] Figure 1 It is a schematic structural diagram of the test device according to an embodiment of the present invention;

[0017] Figure 2 It is a side view of the test device according to an embodiment of the present invention;

[0018] Figure 3 It is a schematic structural diagram of the horizontal pipe fixing part according to an embodiment of the present invention;

[0019] Figure 4 It is a cross-sectional view at the first sealing head according to an embodiment of the present invention;

[0020] Figure 5 It is a schematic structural diagram of the inclined pipe fixing part according to an embodiment of the present invention;

[0021] Figure 6 It is a schematic structural diagram of the inclined pipe seat according to an embodiment of the present invention;

[0022] Figure 7 It is a cross-sectional view at the second sealing head according to an embodiment of the present invention;

[0023] Figure 8 It is a cross-sectional view at the driving structure according to an embodiment of the present invention;

[0024] The markings in the attached drawings are as follows: 1. Horizontal pipe fixing part; 11. Base; 12. Arc-shaped cover; 13. Threaded column; 14. Hydraulic cylinder; 2. Inclined pipe fixing part; 21. Vertical seat; 211. Groove; 212. Vertical sliding groove; 22. Jack; 23. Inclined pipe seat; 231. Circular seat; 24. Seat cover; 25. Baffle; 26. Second sealing head; 27. Second pressurized water pipe; 28. Driving structure; 281. Motor; 282. Worm; 283. Worm gear; 284. Transmission gear; 29. Roller; 3. Outer protective frame body; 31. Slide rail; 32. Rack; 33. Stop disk; 34. First sealing head; 35. First pressurized water pipe; 36. Positioning steel plate; 361. Relief hole. Detailed implementation mode

[0025] As Figures 1 to 8 shown, the present invention provides a PVC pipe interface bending internal pressure and external load resistance performance test device, including a horizontal pipe fixing part 1, an inclined pipe fixing part 2 and an outer protective frame body 3. Refer to Figure 1 , the outer protective frame body 3 is a square frame body, and the outer protective frame body 3 includes a slide rail 31. The four horizontally extending beam rods of the outer protective frame body 3 are all slide rails 31. Refer to Figure 3 and Figure 4 , the horizontal pipe fixing part 1 includes a base 11 slidably arranged on the slide rail 31. Two supporting feet are arranged at both ends of the base 11, and the two supporting feet are respectively slidably arranged on the slide rail 31. An arc-shaped groove for bearing the lower side of the horizontal pipe is opened on the base 11. Arc-shaped covers 12 are hinged at both ends of the base 11. The arc-shaped covers 12 are fixed at both ends of the base 11 by screws and form a round hole for wrapping the outside of the horizontal pipe. Anti-slip rubber needs to be arranged between the arc-shaped cover 12 and the arc-shaped groove for fixing the horizontal pipe. The outer end of the base 11 is flush with the outer end of the horizontal pipe. A plurality of threaded columns 13 are fixedly arranged at the outer end of the base 11, and a plurality of threaded columns 13 are also arranged at the outer end of the arc-shaped groove. A stop disk 33 is fixedly arranged on the outer protective frame body 3. A first sealing head 34 is arranged in the middle of the stop disk 33. The stop disk 33 blocks the round hole end formed by the base 11 and the arc-shaped groove. The threaded column 13 passes through the stop disk 33 and is fixed by a nut, so that the first sealing head 34 seals the port of the horizontal pipe. A first pressurized water pipe 35 is also communicated and arranged in the middle of the stop disk 33. A positioning steel plate 36 is also fixed on the outer protective frame body 3. The stop disk 33 is fixed on one side of the positioning steel plate 36. A plurality of relief holes 361 for facilitating the tightening of the nut are opened on the positioning steel plate 36. When fixing the horizontal pipe, place the horizontal pipe on the arc-shaped groove, then lock the arc-shaped covers 12 at both ends, and then lock the stop disk 33 at the port of the horizontal pipe to complete the fixation of the horizontal pipe; Refer to Figure 5 , Figure 6 and Figure 7, the inclined pipe fixing part 2 includes a vertical seat 21 slid on the slide rail 31. The vertical seat 21 moves parallel to the slide rail 31. A jack 22 is fixed on the vertical seat 21. An inclined pipe seat 23 is rotatably arranged at the end of the jack 22. An arc groove for bearing the lower side of the inclined pipe is formed on the inclined pipe seat 23. A seat cover 24 is fixed on the upper side of the inclined pipe seat 23 by screws. A circular hole for wrapping the outer side of the inclined pipe is formed between the seat cover 24 and the inclined pipe seat 23. An anti-slip rubber layer is arranged on the inner side of the circular hole. A baffle 25 is fixed on the outer end of the inclined pipe seat 23 by screws. A second sealing head 26 for sealing the outer end of the inclined pipe is fixed on the baffle 25. A second pressure water pipe 27 is also communicated on the baffle 25. When fixing the inclined pipe, the horizontal pipe needs to be fixed first. At this time, move the vertical seat 21 and lift the jack 22 to support the inclined pipe seat 23 at the bottom side of the end of the inclined pipe, then fix it through the seat cover 24, and then lock it at the port of the inclined pipe through the baffle 25, and the fixation of the inclined pipe can be completed. A locking device needs to be arranged between the vertical seat 21 and the slide rail 31 to ensure that the vertical seat 21 can be fixed on the slide rail 31 after the position is determined. For example, a limit stop block is arranged on the slide rail 31, or a locking screw is arranged, etc.

[0026] The testing device with this structure can repeatedly conduct the bending internal pressure and external load resistance test of the pipeline interface. The two ends of the horizontal pipe can be fixed through the horizontal pipe fixing part 1, then move and fix it towards the direction of the retaining disc 33, and then fix and seal the end of the inclined pipe through the inclined pipe fixing part 2; through the fixation at three points in the pipeline, the pipeline is firmly fixed in the outer protection frame to ensure the subsequent pipeline test. The pipeline test steps are as follows: paste a strain gauge every 1 meter on the inclined pipe, paste 7 strain gauges on the outer semi-circle of the edge of the socket, and connect the strain gauges to the sensor; connect the water pipes at both ends of the pipeline, try to pressurize, and load according to the requirements of the standard GB / T19471.1-2004. After increasing the water pressure to 2PN within half an hour, reduce it to 1.7PN and start holding the load for 1 hour. During this period, observe whether there is leakage, pay attention to the time of leakage and the deformation of the socket, and then collect and record the data; replace the pipelines with different inclined pipe lengths and conduct the test in the previous steps; while conducting the sealing test, an impact test can also be carried out. During the 1-hour load holding process, drop a hammer on the socket part and observe whether there is water leakage and damage; the whole test is expected to take 3 hours; the inclined pipe lengths of the pipeline are selected as 1.5 meters, 3 meters, 4.5 meters, and 6 meters.

[0027] This testing device can quickly realize the three-point positioning of the pipeline through the horizontal pipe fixing part 1 and the inclined pipe fixing part 2, and seal both ends of the pipeline to ensure that the pipeline is firmly fixed during the load holding test; this device does not need to fix the pipeline by welding each time, reducing the preliminary work of pipeline fixing, reducing the difficulty of repeated tests, and reducing the test time.

[0028] In a further solution, such as Figure 3As shown, a hydraulic cylinder 14 is fixedly installed on the outer protection frame body 3. The output end of the hydraulic cylinder 14 is fixedly connected to the base 11, and the hydraulic cylinder 14 pushes the base 11 to move towards the retaining disc 33.

[0029] This structure is used to ensure the seal between the horizontal pipe and the retaining disc 33. The horizontal pipe is pushed towards the retaining disc 33 by the hydraulic cylinder 14 and then fixed by nuts. After fixation, the seal between the horizontal pipe and the retaining disc 33 is better. And during the load test, the hydraulic cylinder 14 can continuously apply force to avoid the damage to the seal between the retaining disc 33 and the horizontal pipe caused by water pressure.

[0030] In a further solution, as Figure 8 shown, a driving structure 28 is arranged inside the vertical seat 21. The driving structure 28 includes a motor 281, a worm 282 and a number of worm wheels 283. The output end of the motor 281 is connected to the worm 282, the worm 282 meshes with the worm wheels 283, a rack 32 is arranged on the slide rail 31, the worm wheels 283 mesh with a transmission gear 284, and the transmission gear 284 meshes with the rack 32.

[0031] In this device, through the connection mode of the worm wheels 283 and the worm 282, the motor 281 is used to drive the vertical seat 21 to move on the slide rod, and the braking of the movement of the vertical rod is also realized, that is, the vertical seat 21 can only be driven to move by the motor 281, and the movement of the vertical seat 21 itself is locked by the worm wheels 283 and the worm 282. This structure limits the movement of the vertical seat 21 along the slide rail 31 during the test process, and other locking devices do not need to be used. While simplifying the movement mode of the vertical seat 21, the locking effect of the vertical seat 21 is also ensured.

[0032] In a further solution, as Figure 8 shown, sinking grooves are respectively opened at the four corners of the vertical seat 21. Rolling wheels 29 are rotatably arranged on the horizontal planes of the sinking grooves, and the rolling wheels 29 are rollingly arranged on the horizontal planes of the slide rail 31; the motor 281 is arranged in the middle and lower part of the vertical seat 21, there are two worm wheels 283 which are respectively meshed on both sides of the worm 282, there are four transmission gears 284 which are coaxially connected in pairs, and the rack 32 is arranged on the inner side surface of the slide rail 31, and the four transmission gears 284 are respectively meshed on the four racks 32.

[0033] For the vertical seat 21 with this structure, the four corners of the vertical seat 21 are limited by the four slide rails 31 to limit the movement direction of the vertical seat 21. And through the support of the rolling wheels 29, the movement of the vertical seat 21 is smoother. The four transmission gears 284 are simultaneously driven by the motor 281 and are simultaneously meshed on the racks 32 of the four slide rails 31. The movement of the vertical seat 21 is smoother, and the braking effect is better, avoiding the torsion of the vertical seat 21 during the one-way movement process.

[0034] In a further solution, such as Figure 5 and Figure 6 , a groove 211 is formed in the vertical base 21, vertical sliding grooves 212 are arranged on both side surfaces of the groove 211, circular seats 231 are arranged on both sides of the inclined pipe base 23, the circular seats 231 are slidably and rotatably arranged in the vertical sliding grooves 212, and the diameter of the circular seats 231 is equal to the width of the vertical sliding grooves 212.

[0035] This structure enables the inclined pipe base 23 for fixing the inclined pipe to move up and down along the groove 211 of the vertical base 21, rotate in the sliding groove, and be restricted from lateral movement. During the test, the inclined pipe base 23 is fixed by the vertical base 21, and the vertical base 21 is fixed by the locking device. This structure can fix the end of the inclined pipe on the outer protection frame, prevent the inclined pipe from deflecting and moving, and ensure the progress of the test.

[0036] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A testing device for the bending internal pressure and external load resistance performance of a PVC pipe interface, characterized in that: It includes a horizontal pipe fixing part (1), an inclined pipe fixing part (2) and an outer protective frame body (3). The outer protective frame body (3) includes a slide rail (31). The horizontal pipe fixing part (1) includes a base (11) slidably arranged on the slide rail (31). An arc-shaped groove for bearing the lower side of the horizontal pipe is formed in the base (11). Arc-shaped covers (12) are hinged at both ends of the base (11). The arc-shaped covers (12) are fixed at both ends of the base (11) by screws and form a circular hole for wrapping the outer side of the horizontal pipe. The outer end of the base (11) is flush with the outer end of the horizontal pipe. A plurality of threaded columns (13) are fixedly arranged at the outer end of the base (11). A retaining disc (33) is fixedly arranged on the outer protective frame body (3). A first sealing head (34) is arranged in the middle of the retaining disc (33). The retaining disc (33) is placed against the outer end of the base (11). The threaded columns (13) pass through the retaining disc (33) and are fixed by nuts, so that the first sealing head (34) seals the port of the horizontal pipe. A first pressure water pipe (35) is also communicated and arranged in the middle of the retaining disc (33). The inclined pipe fixing part (2) includes a vertical seat (21) slidably arranged on the slide rail (31). A jack (22) is fixed on the vertical seat (21). An inclined pipe seat (23) is rotatably arranged at the end of the jack (22). An arc-shaped groove for bearing the lower side of the inclined pipe is formed in the inclined pipe seat (23). A seat cover (24) is fixed on the upper side of the inclined pipe seat (23) by screws. The seat cover (24) and the inclined pipe seat (23) form a circular hole for wrapping the outer side of the inclined pipe. A baffle (25) is fixed at the outer end of the inclined pipe seat (23) by screws. A second sealing head (26) for sealing the outer end of the inclined pipe is fixedly arranged on the baffle (25). A second pressure water pipe (27) is also communicated and arranged on the baffle (25).

2. The PVC pipe interface bending internal pressure and external load resistance performance testing device according to claim 1, characterized in that: A hydraulic cylinder (14) is fixedly arranged on the outer protective frame body (3). The output end of the hydraulic cylinder (14) is fixedly connected with the base (11). The hydraulic cylinder (14) pushes the base (11) to move towards the retaining disc (33).

3. The PVC pipe joint bending internal pressure and external load resistance performance testing device according to claim 1, characterized in that: A driving structure (28) is arranged inside the vertical seat (21). The driving structure (28) includes a motor (281), a worm (282) and a plurality of worm wheels (283). The output end of the motor (281) is connected with the worm (282). The worm (282) meshes with the worm wheels (283). A rack (32) is arranged on the slide rail (31). The worm wheels (283) mesh with transmission teeth (284). The transmission teeth (284) mesh with the rack (32).

4. The PVC pipe joint bending internal pressure and external load resistance performance testing device according to claim 3, characterized in that: The vertical base (21) is simultaneously slidably arranged on the four slide rails (31). The four slide rails (31) are distributed at the four corners of a square. Sinking grooves are respectively formed at the four corners of the vertical base (21). Rollers (29) are rotatably arranged on the horizontal plane of the sinking grooves. The rollers (29) are rollingly arranged on the horizontal plane of the slide rails (31). The motor (281) is arranged in the middle and lower part of the vertical base (21). There are two worm wheels (283) which are respectively meshed on both sides of the worm (282). There are four transmission gears (284) which are coaxially connected in pairs. The rack (32) is arranged on the inner side surface of the slide rail (31). The four transmission gears (284) are respectively meshed on the four racks (32).

5. The PVC pipe joint bending internal pressure and external load resistance performance testing device according to claim 4, characterized in that: A groove (211) is formed on the vertical base (21). Vertical sliding grooves (212) are arranged on both side surfaces of the groove (211). Circular seats (231) are arranged on both sides of the inclined pipe base (23). The circular seats (231) are slidably and rotatably arranged in the vertical sliding grooves (212). The diameter of the circular seats (231) is equal to the width of the vertical sliding grooves (212).

6. The PVC pipe joint bending internal pressure and external load resistance performance testing device according to claim 1, characterized in that: A positioning steel plate (36) is further fixed on the outer protection frame body (3). The retaining disc (33) is fixed on one side of the positioning steel plate (36). A number of relief holes (361) for facilitating the screwing of nuts are formed on the positioning steel plate (36).

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