Pressure detection mechanism for plastic pipe

Abstract

The utility model relates to a pressure resistance detection mechanism for plastic pipeline belongs to plastic pipeline detection equipment field, including frame, the left and right sides of frame are provided with first abutment block and second abutment block respectively, the right side wall of first abutment block is opened with the first accommodating hole of circular table shape, second abutment block is set up in frame through guide rail and can reciprocate left and right, and its left side wall is opened with the second accommodating hole of circular table shape, the right side wall of first abutment block still is fixed with first connecting block, and first connecting block is opened with the first connecting hole of through it, and the inner side wall of first connecting hole is opened with internal thread, and is installed with the replaceable mounting cylinder through internal thread, and the inner side of mounting cylinder forms the mounting hole with the coaxial line of first accommodating hole, first abutment block still is provided with the water inlet pipe of intercommunication with first accommodating hole. The utility model can save the time of adjusting plastic pipeline posture in the detection process, to improve the detection efficiency.

Description

Technical Field

[0001] This utility model relates to the field of plastic pipe testing equipment, and in particular to a pressure resistance testing mechanism for plastic pipes. Background Technology

[0002] Plastic pipes, as core components in building engineering and fluid transportation systems, are typically made from synthetic resins as the base material, supplemented with functional additives such as stabilizers, lubricants, and plasticizers, and are produced by extrusion molding using pipe-making machines. Examples include HDPE pipes, PVC-U pipes, ABS pipes, and PE pipes. Due to their outstanding advantages such as light weight, corrosion resistance, and convenient installation, plastic pipes have been widely used in residential water supply, municipal water transmission, and industrial fluid transportation, gradually replacing traditional metal pipes.

[0003] Because plastic pipes must withstand the fluid pressure within the system for extended periods during actual use, substandard pressure resistance can easily lead to pipe deformation, bursting, and other malfunctions. This not only disrupts the fluid transport process but can also cause secondary problems such as indoor water accumulation, equipment damage, and road subsidence, resulting in economic losses and safety hazards. Therefore, plastic pipes must undergo rigorous water pressure testing before leaving the factory to ensure they meet relevant industry standards and usage scenario requirements.

[0004] Patent document CN223154711U discloses a pressure resistance testing device for plastic pipes, used to complete the pressure resistance test of plastic pipes. The design of the first sealing sleeve and the second sealing sleeve enables the device body to position plastic pipes of different diameters and ensures the airtightness of the pipe during the pressure resistance test, avoiding water leakage due to mismatch of orifice diameters, thus ensuring the normal operation of the pressure resistance test of plastic pipes and improving the practicality and applicability of the device body. However, this pressure resistance testing device relies solely on the conical structure of the first and second sealing sleeves to achieve contact with the pipe through clamping force, without any radial limiting or axial positioning reference structure. Therefore, it lacks positioning guidance, and the pipe is prone to circumferential deflection or axial displacement during installation. This results in the pipe end and the contact surface of the sealing sleeve not being able to quickly align and become coaxial. To avoid sealing gaps caused by posture deviations, operators need to repeatedly fine-tune the pipe position to calibrate the coaxiality. For example, they need to observe whether the pipe is evenly attached to the edge of the sealing sleeve. If gaps are found in some areas, the pipe placement angle or front and back position needs to be readjusted until it is confirmed that the fit is tight before the test can be started. This undoubtedly consumes a lot of time, making it difficult to improve the testing efficiency.

[0005] Based on this, the present invention provides a pressure resistance testing mechanism for plastic pipes to solve the above problems. Utility Model Content

[0006] Based on this, the present invention provides a pressure resistance testing mechanism for plastic pipes, including a frame, a first abutting block and a second abutting block respectively provided on the left and right sides of the frame, the first abutting block being fixedly provided on the frame, and a first receiving hole in the shape of a frustum being opened on the right side wall of the first abutting block, the major diameter of the first receiving hole being set to the right, the second abutting block being provided on the frame being movable left and right by a guide rail, and a second receiving hole in the shape of a frustum being opened on the left side wall of the second abutting block, the major diameter of the second receiving hole being set to the left, and the second receiving hole being coaxial with the first receiving hole; A first connecting block is also fixedly provided on the right side wall of the first abutting block. The first connecting block has a first connecting hole that passes through it. The first connecting hole is coaxially arranged with the first receiving hole, and the inner diameter of the first connecting hole is the same as the maximum inner diameter of the first receiving hole. The inner side wall of the first connecting hole has an internal thread, and a replaceable mounting cylinder is installed through the internal thread. The inner side of the mounting cylinder has a mounting hole coaxial with the first receiving hole. The first abutting block is also provided with a water inlet pipe, which communicates with the first receiving hole through a water inlet channel opened in the first abutting block.

[0007] Furthermore, the first abutting block and the first connecting block are integrally formed.

[0008] Furthermore, the inner walls of both the first and second receiving holes are provided with a rubber buffer layer.

[0009] Furthermore, a second connecting block is fixedly installed at the bottom of the left sidewall of the second abutment block. The bottom surface of the second connecting block and the bottom surface of the second abutment block are located on the same horizontal plane to form a mounting surface, which is connected to the guide rail. A semi-cylindrical receiving groove is opened on the upper surface of the second connecting block. The receiving groove is connected to the second receiving hole and is coaxial with the second receiving hole. The inner diameter of the receiving groove is the same as the maximum inner diameter of the second receiving hole. The receiving groove extends to the left out of the second connecting block. A through groove is opened at the bottom of the receiving groove.

[0010] Furthermore, an annular mounting groove is provided on the inner side of the mounting hole, and a sealing ring is provided in the annular mounting groove.

[0011] Furthermore, the frame includes several support legs and a support platform fixedly disposed on the top of the support legs. The upper surface of the support platform is horizontal, forming a support surface. The first abutment block is fixedly disposed on the support surface, and the second abutment block is disposed on the support surface that can move back and forth left and right via a guide rail. A first opening is provided on the support platform corresponding to the through slot, and a water storage tank is provided on the frame corresponding to the first opening. The water storage tank is located below the first opening.

[0012] Furthermore, a guide frame is fixedly provided at the bottom of the second connecting block. The inner sidewall of the guide frame is longitudinally flush with the inner sidewall of the through groove, and the lower end of the guide frame extends into the water storage tank.

[0013] Furthermore, a support plate can be vertically mounted on the frame, the support plate is horizontally positioned, and the support platform has a second opening corresponding to the support plate for the support plate to pass through.

[0014] The principle and effects of this utility model will be further explained below with reference to the above technical solution and the accompanying drawings: In this invention, by setting a first connecting block on the first abutting block, the plastic pipe to be tested can be positioned during the installation of the plastic pipe to be tested into the pressure testing mechanism. Specifically, an installation cylinder is detachably connected to the first connecting hole on the first connecting block through a threaded structure. The installation hole on the inner side of the installation cylinder is the same as the outer diameter of the plastic pipe. Before clamping the plastic pipe between the first receiving hole and the second receiving hole, one end of the plastic pipe is inserted into the installation hole to fix the posture of the plastic pipe. This prevents the plastic pipe from deflecting or shifting axially during the clamping process, thereby effectively saving time in adjusting the posture of the plastic pipe and greatly improving the testing efficiency.

[0015] Furthermore, in this invention, the mounting cylinder can be replacedly installed in the first connecting hole. By preparing mounting cylinders with mounting holes of different sizes, the pressure testing mechanism can be adapted to the testing of plastic pipes with different outer diameters, thus enabling the pressure testing mechanism to have good adaptability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the pressure resistance testing mechanism for plastic pipes as described in an embodiment of the present invention; Figure 2 This is a cross-sectional structural diagram of the pressure resistance testing mechanism for plastic pipes described in an embodiment of the present invention; Figure 3 for Figure 2 A magnified view of a portion of the image; Figure 4 This is a schematic diagram of the connection structure between the second abutting block and the second connecting block in an embodiment of the present invention.

[0017] Figure Labels

[0018] 11-Supporting foot, 12-Supporting platform, 121-First opening, 122-Second opening, 13-Water storage tank, 21-First abutting block, 211-First receiving hole, 212-Water inlet channel, 22-First connecting block, 23-Water inlet pipe, 24-Installation cylinder, 31-Second abutting block, 311-Second receiving hole, 32-Second connecting block, 321-Receiving groove, 322-Passing groove, 33-Guide frame, 4-Guide rail, 5-Drive cylinder, 6-Supporting plate, 7-Plastic pipe. Detailed Implementation

[0019] To facilitate understanding by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments: like Figure 1-4 A pressure resistance testing mechanism for plastic pipes includes a frame. A first abutment block 21 and a second abutment block 31 are respectively arranged on the left and right sides of the frame. The first abutment block 21 is fixedly mounted on the frame, and a first frustum-shaped receiving hole 211 is formed on the right side wall of the first abutment block 21, with its major diameter facing to the right. The second abutment block 31 is movably mounted on the frame via a guide rail 4. A second frustum-shaped receiving hole 311 is formed on the left side wall of the second abutment block 31, with its major diameter facing to the left, and the second receiving hole 311 is coaxial with the first receiving hole 211. A first connecting block 22 is also fixedly installed on the right side wall of block 21. A first connecting hole is opened on the first connecting block 22, which is coaxial with the first receiving hole 211. The inner diameter of the first connecting hole is the same as the maximum inner diameter of the first receiving hole 211. An internal thread is opened on the inner side wall of the first connecting hole, and a replaceable mounting cylinder 24 is installed through the internal thread. The inner side of the mounting cylinder 24 forms a mounting hole coaxial with the first receiving hole 211. A water inlet pipe 23 is also provided on the first abutting block 21. The water inlet pipe 23 communicates with the first receiving hole 211 through a water inlet channel 212 opened in the first abutting block 21.

[0020] In this invention, the pressure resistance testing mechanism is used to test the pressure resistance performance of the plastic pipe 7.

[0021] In this invention, the first receiving hole 211 and the second receiving hole 311 on the first abutting block 21 and the second abutting block 31 are used to fix the plastic pipe 7 to be tested and to seal both ends of the plastic pipe 7. Specifically, the two ends of the plastic pipe 7 are inserted into the first receiving hole 211 and the second receiving hole 311 respectively, and then the second abutting block 31 is moved to the left to press the plastic pipe 7 between the first receiving hole 211 and the second receiving hole 311, thereby fixing the plastic pipe 7. At this time, the axis of the plastic pipe 7 is on the same straight line as the axis of the first receiving hole 211 and the second receiving hole 311, and the inner sidewalls of the first receiving hole 211 and the second receiving hole 311 will fit tightly against the end of the plastic pipe 7, thereby sealing the end of the plastic pipe 7. At this time, the liquid for testing, such as water, can be injected into the first receiving hole 211 through the water inlet pipe 23, so that the liquid fills the plastic pipe 7, thereby completing the pressure resistance test of the plastic pipe 7. The second abutment block 31 can be driven by a drive cylinder 5 mounted on the frame to achieve reciprocating left and right movement of the second abutment block 31 on the frame.

[0022] In this invention, a first connecting block 22 is also provided on the first abutting block 21. An mounting cylinder 24 is detachably connected to the first connecting hole on the first connecting block 22 via a threaded structure. The mounting hole inside the mounting cylinder 24 needs to be set according to the outer diameter of the plastic pipe 7 to be tested. By making the inner diameter of the mounting hole the same as the outer diameter of the plastic pipe 7, the mounting hole can position the plastic pipe 7. Specifically, before clamping the plastic pipe 7 between the first receiving hole 211 and the second receiving hole 311, one end of the plastic pipe 7 is inserted into the mounting hole to fix the plastic pipe 7. The orientation of the plastic pipe 7 ensures that it will not deflect or shift axially during clamping. Thus, after the first receiving hole 211 and the second receiving hole 311 clamp the plastic pipe 7, the axis of the plastic pipe 7 will be aligned with the axes of the first receiving hole 211 and the second receiving hole 311. The end of the plastic pipe 7 is sealed by the inner walls of the first receiving hole 211 and the second receiving hole 311. Therefore, this invention eliminates the need to adjust the orientation of the plastic pipe 7, effectively saving time required for adjustment and greatly improving testing efficiency. Preferably, the right side of the first connecting hole is widened from left to right to facilitate the insertion of the plastic pipe 7.

[0023] Furthermore, in this invention, the mounting cylinder 24 can be replacedly installed in the first connecting hole. By preparing mounting cylinders 24 with mounting holes of different sizes, the pressure testing mechanism can be adapted to the testing of plastic pipes 7 with different outer diameters, thus enabling the pressure testing mechanism to have good adaptability.

[0024] In one embodiment, the first abutting block 21 and the first connecting block 22 are integrally formed.

[0025] In this embodiment, the one-piece molding design can be achieved through casting or CNC one-piece machining process. The one-piece molding structure can eliminate the assembly gap between the first abutment block 21 and the first connecting block 22 and improve its connection strength, thereby preventing the test liquid from leaking from its connection surface, ensuring stable test pressure, avoiding interference with test results due to leakage, and also preventing the first connecting block 22 from shifting or breaking due to the reaction force generated by the pressure on the pipeline during the test, thus extending the service life of the mechanism.

[0026] In one embodiment, the inner sidewalls of both the first receiving hole 211 and the second receiving hole 311 are provided with a rubber buffer layer.

[0027] In this embodiment, the rubber buffer layer is preferably made of water-resistant and aging-resistant nitrile rubber or silicone rubber, and is fixed to the inner wall of the first receiving hole 211 and the second receiving hole 311 by adhesive bonding. When the end of the plastic pipe 7 is inserted into the first receiving hole 211 and the second receiving hole 311 and clamped, the rubber buffer layer can undergo adaptive deformation under pressure. On the one hand, it fills the small gap between the pipe end and the inner wall of the first receiving hole 211 and the second receiving hole 311 (such as the manufacturing tolerance of the pipe outer diameter or the surface unevenness), enhancing the sealing performance. On the other hand, by replacing rigid contact with elastic contact, the buffering effect of the rubber buffer layer can disperse the clamping force and avoid damage to the end of the plastic pipe 7.

[0028] In one embodiment, a second connecting block 32 is fixedly provided at the bottom end of the left sidewall of the second abutment block 31. The bottom surface of the second connecting block 32 and the bottom surface of the second abutment block 31 are located on the same horizontal plane to form a mounting surface, which is connected to the guide rail 4. A semi-cylindrical receiving groove 321 is provided on the upper surface of the second connecting block 32. The receiving groove 321 is connected to the second receiving hole 311 and is coaxially arranged with the second receiving hole 311. The inner diameter of the receiving groove 321 is the same as the maximum inner diameter of the second receiving hole 311. The receiving groove 321 extends to the left out of the second connecting block 32. A through groove 322 is provided at the bottom of the receiving groove 321.

[0029] In this embodiment, the receiving groove 321 on the second connecting block 32 is connected to the second receiving hole 311. Therefore, after the plastic tube is tested, the second abutment block 31 moves to the right by a certain distance, so that an annular gap appears between the end of the plastic tube 7 and the inner wall of the second receiving hole 311. At this time, the test liquid in the plastic tube 7 will flow into the receiving groove 321 through the annular gap, and flow to the bottom of the second connecting block 32 via the through groove 322 at the bottom of the receiving groove 321. This allows for the directional discharge of the test liquid in the plastic tube 7, which facilitates the collection of the test liquid.

[0030] Furthermore, the second connecting block 32 and the second abutting block 31 combine to form an abutting sealing part. Preferably, the second connecting block 32 and the second abutting block 31 are integrally formed to improve the strength of their connection structure and eliminate their assembly gaps. The bottom of the abutting sealing part is a horizontal mounting surface. Compared to connecting the second abutting block 31 to the guide rail 4 separately, the mounting surface formed by the bottom of the second connecting block 32 and the second abutting block 31 can significantly increase the effective contact range between the abutting sealing part and the guide rail 4. The larger mounting surface can make the support force of the guide rail 4 on the abutting sealing part more uniform, which can avoid the situation of "single-point sinking" or "lateral tilting" of the abutting sealing part during movement due to local force concentration. This can ensure that the abutting sealing part always moves along the preset trajectory of the guide rail 4, improving its guiding accuracy. Taking the commonly used roller linear guide as an example, the guide body of the roller linear guide is fixed to the support surface of the frame, and its slider assembly is fastened to the mounting surface of the abutting seal by bolts. Due to the increased mounting surface area, more sliders can be arranged along the length of the guide. The slider spacing can be adjusted according to the length of the abutting seal. When the abutting seal clamps the pipe and bears the reaction force of the pipe under the action of the drive cylinder 5, the driving force and reaction force will be evenly transmitted to multiple sliders through the mounting surface, and then distributed to the guide body 4 by the sliders through the rollers, so as to avoid plastic deformation or aggravated wear of a single slider due to excessive load.

[0031] In one embodiment, an annular mounting groove is provided on the inner side of the mounting hole, and a sealing ring is provided in the annular mounting groove.

[0032] In this embodiment, the sealing ring is a high-pressure resistant rubber ring with an O-shaped or Y-shaped cross-section, and the depth and width of the annular mounting groove match the size of the sealing ring. The presence of the sealing ring creates a sealing structure between the plastic pipe 7 and the mounting cylinder 24, thereby strengthening the sealing structure between the first receiving hole 211 and the plastic pipe 7. That is, even if the sealing structure between the first receiving hole 211 and the end of the plastic pipe 7 is damaged, the sealing structure between the plastic pipe 7 and the mounting cylinder 24 can still prevent the test liquid from overflowing.

[0033] In one embodiment, the frame includes a plurality of support legs 11 and a support platform 12 fixedly disposed on the top of the support legs 11. The upper surface of the support platform 12 is horizontal, forming a support surface. The first abutment block 21 is fixedly disposed on the support surface, and the second abutment block 31 is disposed on the support surface through a guide rail 4. A first opening 121 is provided on the support platform 12 corresponding to the through slot 322, and a water storage tank 13 is provided on the frame corresponding to the first opening 121. The water storage tank 13 is located below the first opening 121.

[0034] In this embodiment, the first opening 121 on the support platform 12 is used for the passage of test liquid flowing down the channel 322. After passing through the first opening 121, the test liquid flows into the water storage tank 13 below the first opening 121, thereby completing the collection of the test liquid. The first opening 121 needs to cover the movement path of the channel 322 to ensure that all test liquid flowing through the channel 322 can flow into the water storage tank 13 below through the first opening 121.

[0035] In one embodiment, a guide frame 33 is fixedly provided at the bottom end of the second connecting block 32. The inner sidewall of the guide frame 33 is longitudinally flush with the inner sidewall of the through groove 322, and the lower end of the guide frame 33 extends into the water storage tank 13.

[0036] In this embodiment, the guide frame 33 is used to extend the flow path of the test liquid to ensure that the test liquid enters the water storage tank 13 accurately. Specifically, the guide frame 33 is connected to the through groove 322 to form a closed flow channel, which can directly guide the liquid discharged from the through groove 322 into the water storage tank 13, thereby avoiding liquid splashing.

[0037] In one embodiment, a support plate 6 may be vertically mounted on the frame. The support plate 6 is horizontally mounted, and the support platform 12 has a second opening 122 corresponding to the support plate 6 for the support plate 6 to pass through.

[0038] In this embodiment, the support plate 6 can be raised and lowered using a cylinder or a screw jack. The height of the support plate 6 is adjusted according to the outer diameter of the plastic pipe 7, so that the upper surface of the support plate 6 fits against the outer wall of the pipe, forming an auxiliary support point that provides support from below. This ensures the stability of the pipe's posture and prevents the sealing surfaces between the end of the long pipe and the first receiving hole 211 and the second receiving hole 311 from detaching due to bending under its own weight. This prevents liquid leakage from the sealing surfaces during testing and ensures stable testing pressure.

[0039] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A pressure resistance testing mechanism for plastic pipes, characterized in that, The device includes a frame, on which a first abutment block and a second abutment block are respectively provided on the left and right sides. The first abutment block is fixedly mounted on the frame, and a first receiving hole in the shape of a frustum is formed on the right side wall of the first abutment block, with the major diameter of the first receiving hole facing to the right. The second abutment block is mounted on the frame and can reciprocate left and right via a guide rail. A second receiving hole in the shape of a frustum is formed on the left side wall of the second abutment block, with the major diameter of the second receiving hole facing to the left, and the second receiving hole is coaxial with the first receiving hole. The right side wall of the first abutment block also... A first connecting block is fixedly provided, and a first connecting hole is provided through the first connecting block. The first connecting hole is coaxially arranged with the first receiving hole, and the inner diameter of the first connecting hole is the same as the maximum inner diameter of the first receiving hole. An internal thread is provided on the inner side wall of the first connecting hole, and a replaceable mounting cylinder is installed through the internal thread. The inner side of the mounting cylinder forms a mounting hole coaxial with the first receiving hole. A water inlet pipe is also provided on the first abutment block, and the water inlet pipe communicates with the first receiving hole through a water inlet channel opened in the first abutment block.

2. The pressure resistance testing mechanism for plastic pipes according to claim 1, characterized in that, The first abutting block and the connecting block are integrally formed.

3. The pressure resistance testing mechanism for plastic pipes according to claim 1, characterized in that, Both the first and second receiving holes have rubber buffer layers on their inner sidewalls.

4. A pressure resistance testing mechanism for plastic pipes according to any one of claims 1-3, characterized in that, A second connecting block is also fixedly installed at the bottom of the left side wall of the second abutment block. The bottom surface of the second connecting block and the bottom surface of the second abutment block are located on the same horizontal plane to form a mounting surface. The mounting surface is connected to the guide rail. A semi-cylindrical receiving groove is opened on the upper surface of the second connecting block. The receiving groove is connected to the second receiving hole and is coaxial with the second receiving hole. The inner diameter of the receiving groove is the same as the maximum inner diameter of the second receiving hole. The receiving groove extends to the left out of the second connecting block. A through groove is opened at the bottom of the receiving groove.

5. The pressure resistance testing mechanism for plastic pipes according to claim 4, characterized in that, An annular mounting groove is provided on the inner side of the mounting hole, and a sealing ring is provided in the annular mounting groove.

6. The pressure resistance testing mechanism for plastic pipes according to claim 5, characterized in that, The frame includes several support legs and a support platform fixedly mounted on the top of the support legs. The upper surface of the support platform is horizontal, forming a support surface. The first abutment block is fixedly mounted on the support surface, and the second abutment block is mounted on the support surface and can move back and forth on the support surface via a guide rail. A first opening is provided on the support platform corresponding to the through slot, and a water storage tank is provided on the frame corresponding to the first opening. The water storage tank is located below the first opening.

7. A pressure resistance testing mechanism for plastic pipes according to claim 6, characterized in that, The bottom end of the second connecting block is also fixedly provided with a guide frame. The inner side wall of the guide frame is longitudinally flush with the inner side wall of the through groove, and the lower end of the guide frame extends into the water storage tank.

8. A pressure resistance testing mechanism for plastic pipes according to claim 6, characterized in that, The frame can also be equipped with a support plate that is raised and lowered. The support plate is horizontally positioned, and the support platform has a second opening corresponding to the support plate for the support plate to pass through.

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