Multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings

Abstract

The application discloses a kind of chlorinated polyvinyl chloride pipe fittings multi-station pressure test device, it is related to chlorinated polyvinyl chloride performance detection technical field, including cabinet, its inside is provided with multiple temperature independent controllable detection bin, support assembly is set in each detection bin, it includes lifting frame unit, multiple positioning support components and locking assembly installed on lifting frame unit;Each support positioning unit corresponds to support and positions one pipe fitting to be detected.The lifting frame unit includes multiple load-bearing frames distributed along up and down interval, and different positioning support components are combined and configured according to pipe fitting type by the movement of lifting frame unit load-bearing frame.The advantage is that: the present application is through multi-temperature zone independent temperature control, multi-station parallel detection and locking / unlocking bistable support mechanism, and the efficiency, high compatibility and standard compliance of chlorinated polyvinyl chloride pipe fittings pressure test are considered, and the detection efficiency, equipment versatility and the reliability of test data are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of performance testing technology for chlorinated polyvinyl chloride (PVC), and more particularly to a multi-station pressure testing device for chlorinated PVC pipe fittings. Background Technology

[0002] Currently, chlorinated polyvinyl chloride (CPVC) pipe fittings are widely used in building hot and cold water transportation, industrial fluid handling, and fire protection systems due to their excellent high-temperature resistance and chemical corrosion resistance. Instantaneous burst strength testing is a key test for evaluating the pressure-bearing capacity of CPVC pipe fittings. Its purpose is to determine the fitting's ability to withstand ultimate internal pressure within a short period of time, verifying whether it meets design requirements and safety standards.

[0003] In existing instantaneous burst strength testing of CPVC pipe fittings, relevant testing standards strictly require that the specimens not be subjected to any additional longitudinal or radial restraint forces during the pressure test to ensure the authenticity of the burst pressure data. To meet this requirement, the current operating method typically involves installing sealing joints one by one on the outside of the testing chamber, connecting each sealing joint to the pressurized pipeline, and then placing the pipe fittings into the testing chamber in a completely free state for testing. This method is difficult to operate, prone to specimen displacement, and cannot achieve batch operation. If tooling is used to temporarily fix the pipe fittings to improve operational convenience, it inevitably introduces additional restraint forces, leading to inaccurate or even invalid test results. The contradiction between operational convenience and standard compliance has long existed, becoming a key bottleneck restricting testing efficiency.

[0004] In addition, the pressure-bearing capacity of CPVC pipe fittings varies significantly with temperature. However, existing testing equipment can usually only operate at a single temperature point. Multi-temperature point testing requires repeated heating and cooling of a single water bath, which is time-consuming and further exacerbates the problem of low testing efficiency.

[0005] Meanwhile, CPVC piping systems typically include various types of fittings such as straight pipes, 90° bends, and tees. All these fittings are critical components of the pressure system and require instantaneous burst strength testing. However, there is currently a lack of a universal testing fixture that is compatible with all these pipe types and simultaneously meets the "free support" test requirements.

[0006] Therefore, in order to balance high efficiency, high compatibility and standard compliance in pressure testing, this invention provides a multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings. Summary of the Invention

[0007] The purpose of this invention is to solve the problems existing in the prior art, and to propose a multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings includes a chassis with multiple independently temperature-controlled testing chambers inside.

[0010] A support assembly, located within each of the aforementioned testing chambers, includes a lifting frame unit, multiple positioning and support components mounted on the lifting frame unit, and a locking component.

[0011] The lifting frame unit includes multiple support frames distributed at intervals along the vertical axis. The movement of the support frames in the lifting frame unit drives different positioning support components to be combined and configured according to the type of pipe fitting.

[0012] Each of the positioning and supporting components includes two opposing wedge-shaped blocks, with a V-shaped supporting surface formed between the two wedge-shaped blocks. Each positioning and supporting component is installed on a corresponding support frame and can be elastically slidably engaged.

[0013] The locking assembly includes a locking block fixedly installed at the bottom of each wedge-shaped support block, a locking hole opened on the locking block, and a locking pin movably installed via a slide and adapted to the locking hole.

[0014] The support assembly has a locking position and an unlocking position: when in the locking position, the locking pin is inserted into the corresponding locking hole, and each positioning support component is locked in place for batch positioning of the pipe to be tested; when in the unlocking position, the locking pin is separated from the locking hole, each wedge-shaped support block is in a sliding support state, and the pipe to be tested is supported only by the V-shaped support surface.

[0015] In the aforementioned multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings, the lifting frame unit specifically includes an upper support frame, a middle support frame, and a lower support frame. The upper support frame is fixedly installed on the inner wall of the testing chamber, while the middle and lower support frames are slidably installed on the inner wall of the testing chamber.

[0016] In the aforementioned multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings, multiple positioning and support components include a first positioning group and a second positioning group installed on the upper support frame, a third positioning group installed on the middle support frame, and a fourth positioning group installed on the lower support frame.

[0017] In the above-mentioned multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings, the wedge-shaped support block of the first positioning group is elastically slidably connected to the upper support frame along the left and right; the wedge-shaped support block of the second positioning group is connected to the upper support frame through a slide block, the slide block is slidably connected to the upper support frame along the front and back, and the wedge-shaped support block of the second positioning group is elastically slidably connected to the slide block along the left and right.

[0018] In the aforementioned multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings, the wedge-shaped support block of the third positioning group and the middle bearing frame are elastically slidingly engaged along the front and rear; the wedge-shaped support block of the fourth positioning group and the lower bearing frame are elastically slidingly engaged along the front and rear.

[0019] In the aforementioned multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings, the third positioning group and the fourth positioning group are arranged alternately on the left and right.

[0020] In the aforementioned multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings, the upper support frame is provided with a first clearance hole for the third positioning group to pass through and a second clearance hole for the wedge-shaped support block of the fourth positioning group to pass through; the middle support frame is provided with a third clearance hole for the wedge-shaped support block of the fourth positioning group to pass through.

[0021] In the aforementioned multi-position pressure testing device for chlorinated polyvinyl chloride pipe fittings, the first positioning group and the second positioning group cooperate to support straight pipes; the first positioning group, the second positioning group, and the third positioning group cooperate to support 90° bends; and the first positioning group, the second positioning group, the third positioning group, and the fourth positioning group cooperate to support tee fittings.

[0022] In the aforementioned multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings, the locking assembly includes multiple slides, which are slidably installed on the bottom of each support frame. Locking pins are fixedly installed on the slides, and the slides drive the locking pins to insert into or disengage from the corresponding locking holes.

[0023] In the aforementioned multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings, the chassis also includes a cover, which closes onto the top of the chassis; each support frame has a flow channel, which is a strip-shaped channel extending through the thickness of each support frame.

[0024] Compared with existing technologies, the advantages of this invention are:

[0025] This invention, through multi-zone independent temperature control, multi-station parallel testing, and a locking / unlocking dual-state support mechanism, takes into account the high efficiency, high compatibility, and standard compliance of pressure testing of chlorinated polyvinyl chloride pipe fittings, significantly improving testing efficiency, equipment versatility, and the reliability of test data.

[0026] 1. This invention, by setting up multiple independently temperature-controlled testing chambers, allows each chamber to be set and maintained at a different test temperature, enabling simultaneous instantaneous burst strength testing under different temperature conditions. This eliminates the need to wait for repeated heating and cooling of a single water bath, significantly shortening the total testing cycle for multiple temperature points. Simultaneously, it facilitates batch sampling, allowing multiple samples to burst simultaneously under identical testing conditions (same temperature, same pressurization rate, same time period), providing a more reliable statistical basis. The parallel capabilities of a single chamber with multiple workstations, combined with the parallel temperature capabilities of multiple zones, enable the device to complete matrix testing of multiple temperature points and multiple samples within the same time period, greatly expanding the device's applicable scenarios.

[0027] 2. This invention simultaneously satisfies the operational convenience requirements of "rapid batch positioning" and the standard compliance requirements of "no additional binding force during testing," effectively resolving the long-standing contradiction between operational convenience and standard compliance. When in the locking position, each positioning support component is locked in place, the V-shaped support surface provides unified support and positioning, and the sealing joint and pressurized pipeline are quickly connected, making operation convenient and efficient. When in the unlocking position, each wedge-shaped support block switches to a sliding support state, remaining stable under gravity, with no additional clamping or binding force in the horizontal or circumferential directions.

[0028] 3. This invention, through the hierarchical distribution structure of the upper, middle, and lower support frames of the lifting frame unit, enables the on-demand combination and configuration of different positioning and support components. The first and second positioning groups cooperate to support straight pipes; the first, second, and third positioning groups cooperate to support 90° bends; and the first, second, third, and fourth positioning groups cooperate to support tee fittings. One support assembly can accommodate testing of three different types of pipe fittings: straight pipes, 90° bends, and tees. There is no need to design and manufacture special fixtures for each pipe type, reducing tooling costs, shortening pipe type changeover time, and significantly improving the versatility and practicality of the equipment. Attached Figure Description

[0029] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0030] Figure 1 This is a schematic diagram of the overall structure;

[0031] Figure 2 This is a partial cross-sectional structural diagram of a straight pipe during testing.

[0032] Figure 3 This is an exploded view of the lifting frame unit;

[0033] Figure 4 This is a partial cross-sectional structural diagram during a 90° bend pipe test;

[0034] Figure 5 A schematic diagram of the structure for positioning the support component during a 90° bend test;

[0035] Figure 6 This is a partial cross-sectional structural diagram of a tee fitting during testing.

[0036] Figure 7 A structural diagram illustrating the positioning of the support assembly during testing of a tee fitting;

[0037] Figure 8 This is a bottom view of the upper support frame and the corresponding locking components.

[0038] Figure 9 This is a bottom view of the central support frame and the corresponding locking components.

[0039] Figure 10 This is a bottom view of the lower support frame and the corresponding locking components.

[0040] In the diagram: 1. Chassis; 11. Housing; 12. Testing chamber; 2. Lifting frame unit; 21. Upper support frame; 211. First clearance hole; 212. Second clearance hole; 22. Middle support frame; 221. Third clearance hole; 23. Lower support frame; 24. Flow channel; 3. Positioning support assembly; 31. First positioning group; 32. Second positioning group; 33. Third positioning group; 34. Fourth positioning group; 4. Locking assembly; 41. Locking block; 42. Locking pin; 43. Slide carriage. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Reference Figures 1 to 3 A multi-station pressure testing device for chlorinated polyvinyl chloride (PVC) pipe fittings includes a chassis 1 and a support assembly disposed inside the chassis 1. The chassis 1 includes a housing 11 and a cover (not shown in the figure). The cover closes onto the top of the housing 11 to seal the testing environment and provide safety protection. The housing 11 contains multiple testing chambers 12, each with independent temperature control. Specifically, each testing chamber 12 is equipped with an independent heating device, a circulation device, and a temperature sensor (not shown in the figure), which can be set and maintained at different testing temperatures.

[0043] It is important to note that the temperature control range of each testing chamber 12 covers room temperature to 95°C to meet the instantaneous burst strength testing requirements of chlorinated polyvinyl chloride (CPVC) pipe fittings under different temperature conditions (such as 23°C, 60°C, and 80°C, which correspond to typical application scenarios of CPVC pipe fittings in benchmark performance verification, conventional hot water upper limit, and high-temperature extreme conditions, respectively). The pressure-bearing capacity of CPVC pipe fittings varies significantly with temperature, and multi-temperature testing is a necessary means to meet standard requirements, cover actual working conditions, and verify the performance boundaries of materials.

[0044] In this embodiment, there are two detection chambers 12 inside the chassis 1. The two detection chambers 12 can be set to different test temperatures. For example, one detection chamber 12 can be set to 23°C for room temperature burst testing, and the other detection chamber 12 can be set to 80°C for high temperature burst testing, thereby achieving synchronous testing under different temperature conditions.

[0045] The support assembly is located within each testing chamber 12, and includes a lifting frame unit 2, multiple positioning and supporting components 3 mounted on the lifting frame unit 2, and a locking component 4. In this embodiment, each testing chamber 12 is provided with three positioning and supporting components 3, each group of positioning and supporting components 3 is used to support and position one pipe fitting to be tested, thereby realizing the simultaneous testing of three pipe fittings, facilitating batch sampling inspection (such as factory inspection, incoming material inspection), and shortening the total testing cycle. Multiple samples burst simultaneously under completely identical testing conditions (same temperature, same pressure increase rate, same time period), providing a more reliable statistical basis.

[0046] The parallel capabilities of a single-compartment multi-station setup and the parallel temperature capabilities of multiple zones are combined to enable the device to complete matrix testing of multiple temperature points and multiple samples within the same time period, greatly expanding the applicable scenarios of the device.

[0047] Reference Figures 1 to 3 The lifting frame unit 2 includes multiple support frames distributed at vertical intervals. In this embodiment, the lifting frame unit 2 specifically includes an upper support frame 21, a middle support frame 22, and a lower support frame 23. The upper support frame 21 is fixedly installed on the inner wall of the testing chamber 12, while the middle support frame 22 and the lower support frame 23 are slidably installed on the inner wall of the testing chamber 12. The middle support frame 22 and the lower support frame 23 are driven to slide vertically up and down by a driving mechanism (not shown in the figure, specifically by a hydraulic rod).

[0048] Each support frame is provided with a flow channel 24, which is a strip-shaped channel that runs through the thickness of each support frame to reduce the resistance when the support frame moves up and down in the water.

[0049] Reference Figures 1 to 7Each positioning and supporting component 3 includes two opposing wedge-shaped blocks, forming a V-shaped supporting surface between them. This surface supports the pipe fitting and keeps it stable under gravity. Each positioning and supporting component 3 is mounted on a corresponding support frame, and there is an elastic sliding connection between each component 3 and the corresponding support frame. Specifically, the elastic sliding connection can be achieved using a spring, allowing the wedge-shaped blocks to slide elastically within a certain range, ensuring that no additional binding force is applied to the pipe fitting in the unlocked state.

[0050] In this embodiment, the plurality of positioning support components 3 include a first positioning group 31 and a second positioning group 32 installed on the upper support frame 21, a third positioning group 33 installed on the middle support frame 22, and a fourth positioning group 34 installed on the lower support frame 23.

[0051] Specifically, the wedge-shaped support block of the first positioning group 31 is elastically slidably engaged with the upper support frame 21 in the left-right direction; the wedge-shaped support block of the second positioning group 32 is engaged with the upper support frame 21 through a slide block, the slide block is slidably connected to the upper support frame 21 in the front-back direction (driven by an electric slider), and the wedge-shaped support block of the second positioning group 32 is elastically slidably connected to the slide block in the left-right direction. The wedge-shaped support block of the third positioning group 33 is elastically slidably engaged with the middle support frame 22 in the front-back direction; the wedge-shaped support block of the fourth positioning group 34 is elastically slidably engaged with the lower support frame 23 in the front-back direction.

[0052] The upper support frame 21 has a first clearance hole 211 for the third positioning group 33 to pass through, and a second clearance hole 212 for the wedge-shaped support block of the fourth positioning group 34 to pass through; the middle support frame 22 has a third clearance hole 221 for the wedge-shaped support block of the fourth positioning group 34 to pass through. With these clearance holes, when the middle support frame 22 and the lower support frame 23 slide upwards, the wedge-shaped support block of the third positioning group 33 can pass through the first clearance hole 211 and take its position, and the wedge-shaped support block of the fourth positioning group 34 can sequentially pass through the third clearance hole 221 and the second clearance hole 212 and take its position, thereby achieving the required combination configuration for different pipe types. In this embodiment, the third positioning group 33 and the fourth positioning group 34 are staggered in the left-right direction to avoid interference during lifting and lowering.

[0053] Specifically, the first positioning group 31 and the second positioning group 32 cooperate to support straight pipes, wherein the first positioning group 31 and the second positioning group 32 are spaced apart along the length of the pipe fitting, and the two V-shaped supporting surfaces jointly support both ends of the straight pipe. The first positioning group 31, the second positioning group 32, and the third positioning group 33 cooperate to support 90° bends, wherein the first positioning group 31 and the second positioning group 32 support one end of the bend, and the third positioning group 33 supports the other end of the bend. The first positioning group 31, the second positioning group 32, the third positioning group 33, and the fourth positioning group 34 cooperate to support tee fittings (specifically, vertical tees in this embodiment), wherein the first positioning group 31 and the second positioning group 32 support the main section of the tee, and the third positioning group 33 and the fourth positioning group 34 support the two end sections of the tee.

[0054] It should be noted that when supporting 90° bends and tee fittings, the sliding block drives the corresponding wedge-shaped support block of the second positioning group 32 to slide towards the first positioning group 31 (in this embodiment, it slides backward) to avoid the bend of the 90° bend and the two ends of the tee fitting.

[0055] Reference Figures 8 to 10 The locking assembly 4 includes a locking block 41 fixedly installed at the bottom of each wedge-shaped support, a locking hole formed on the locking block 41, and a locking pin 42 movably installed at the bottom of each support frame via a slide 43. The slide 43 is slidably installed at the bottom of each support frame and is driven by a second driving mechanism (not shown in the figure, specifically by a hydraulic rod). The locking pin 42 is fixed to the slide 43, and the slide 43 drives the locking pin 42 to insert or disengage from the corresponding locking hole.

[0056] The support assembly has a locking position and an unlocking position. When in the locking position, the carriage 43 drives the locking pin 42 to insert into the corresponding locking hole, and each positioning support component 3 is locked in place for batch positioning of the pipe fittings to be tested. At this time, the operator can put the pipe fittings (with sealing joints pre-installed at the joint positions of the pipe fittings to be tested and the inside filled with water) into the testing chamber 12 in batches, where they are supported and positioned by each positioning support component 3, and the sealing joints of multiple test pipe fittings are quickly connected to the pressurized pipeline.

[0057] When in the unlocking position, the slide 43 drives the locking pin 42 to disengage from the corresponding locking hole, and each wedge-shaped support block is in a sliding support state. The pipe to be tested is supported only by the V-shaped support surface and remains stable under the action of gravity. There are no other additional clamping forces or binding forces, thus meeting the relevant standard requirements that the sample shall not be subjected to additional longitudinal or radial binding forces during the pressure test.

[0058] In this case, when locking and unlocking the wedge-shaped blocks of the first positioning group 31 and the second positioning group 32, the slide 43 on the upper support frame 21 slides forward and backward, causing the corresponding locking pin 42 to insert into and leave the corresponding locking hole; when locking and unlocking the wedge-shaped blocks of the third positioning group 33, the slide 43 on the middle support frame 22 slides left and right, causing the corresponding locking pin 42 to insert into and leave the corresponding locking hole; when locking and unlocking the wedge-shaped blocks of the fourth positioning group 34, the slide 43 on the lower support frame 23 slides left and right, causing the corresponding locking pin 42 to insert into and leave the corresponding locking hole.

[0059] The specific operating steps of this multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings are as follows:

[0060] 1. Pipe Fitting Pretreatment: Outside the casing 1, the operator installs sealing joints at each end of the pipe fitting to be tested, according to its type and specifications. The sealing joints preferably employ quick-release structures (such as threaded tightening or cam locking). Each sealing joint is equipped with an independent water inlet and air vent valve, facilitating water filling and air venting operations from outside the casing 1. Water at the test temperature is filled into the pipe fitting through the water inlet on the sealing joint. After venting all internal air, the air vent valve is closed.

[0061] II. Selection of Support Combination and Lifting of Bearing Frame: Select the corresponding positioning support combination method according to the type of pipe to be tested (straight pipe, 90° bend or tee).

[0062] When supporting a straight pipe, only the first positioning group 31 and the second positioning group 32 need to cooperate, the middle support frame 22 and the lower support frame 23 remain in the lower position, and the third positioning group 33 and the fourth positioning group 34 do not participate in the work;

[0063] When supporting a 90° bend, the first positioning group 31, the second positioning group 32 and the third positioning group 33 need to cooperate. The drive mechanism drives the middle support frame 22 to slide upward to the working position, so that the wedge-shaped support block of the third positioning group 33 passes through the first clearance hole 211 and is in place.

[0064] When supporting the tee fitting, the first positioning group 31, the second positioning group 32, the third positioning group 33 and the fourth positioning group 34 need to cooperate. The drive mechanism drives the middle support frame 22 and the lower support frame 23 to slide upward to the working position, so that the wedge-shaped support block of the third positioning group 33 passes through the first clearance hole 211 and is in place, and the wedge-shaped support block of the fourth positioning group 34 passes through the third clearance hole 221 and the second clearance hole 212 in sequence and is in place.

[0065] For 90° bends and tee fittings, the wedge-shaped support block of the second positioning group 32 is driven by the slide block to slide towards the first positioning group 31 (sliding backward) to avoid the bend position of the 90° bend and the end of the tee fitting.

[0066] 3. Locking position: Drive mechanism 2 drives slide 43 to slide, so that locking pin 42 is inserted into the locking hole on the bottom locking block 41 of each wedge-shaped support block, locking each positioning support component 3 into place.

[0067] IV. Batch Placement and Connection of Pipe Fittings: Place the pipe fittings (with sealed connectors installed and filled with water in step one) in batches into the testing chamber 12, ensuring each fitting is positioned on the V-shaped support surface of its respective positioning support assembly 3, relying on the V-shaped support surface for positioning. Connect the sealed connectors of each fitting to the pressurized pipeline. Specifically, a high-pressure quick-connect fitting is preferably used at the connection end between the sealed connector and the pressurized pipeline to achieve quick connection and disconnection with the pressurized pipeline installed inside the casing 1.

[0068] V. Unlocking Station Switching: Drive mechanism two drives slide 43 to slide in the opposite direction, causing locking pin 42 to disengage from the corresponding locking hole, and each wedge-shaped support block switches to the sliding support state. At this time, each pipe fitting is supported only by the V-shaped support surface, and there is no additional clamping or binding force in the horizontal and circumferential directions.

[0069] VI. Temperature Equilibrium and Pressure Test: Close the chamber cover and start the temperature control system of each test chamber 12 to stabilize the water bath temperature in the test chamber 12 to the target temperature (such as 23℃, 60℃ or 80℃). After the water inside the pipe and the external water bath are kept at the set temperature until the temperature is balanced, start the pressure equipment and pressurize the inside of each pipe according to the pressure increase rate required by the relevant standards until the pipe bursts.

[0070] It is important to note that during the burst pressure test, pressure should be applied at a uniform rate so that the minimum permissible burst pressure of the specimen is reached within 60 to 70 seconds. If the specimen bursts within 60 seconds, it indicates that the pressurization rate was too fast, and the test result is invalid. The pressurization rate must be reduced, and the test must be repeated with a new specimen. If the specimen bursts after 70 seconds, the test is still considered valid as long as the minimum burst pressure was reached within 60 to 70 seconds.

[0071] VII. Data Recording and Station Reset: Record the burst pressure and burst time of each pipe fitting to determine whether each sample is qualified. The judgment principle is: compare the measured burst pressure with the minimum requirement value specified in the product standard for that specification of pipe fitting; if the requirement value is met or exceeded, it is considered qualified. After the test is completed, open the chamber cover, replace with the next set of pipe fittings to be tested, and repeat steps one through six above.

[0072] It should be noted that when the failure occurs within one pipe diameter of the sealing joint, additional judgment is required: if there is reason to believe that the failure is caused by a defect in the sample itself (such as a material defect or a processing defect), the sample result is valid; otherwise, another sample should be taken and retested.

[0073] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0074] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0075] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0076] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings, characterized in that, include: The chassis contains multiple independently temperature-controlled detection chambers. A support assembly is provided in each of the aforementioned testing chambers, and includes a lifting frame unit, multiple positioning and supporting components mounted on the lifting frame unit, and a locking component; The lifting frame unit includes multiple support frames distributed at vertical intervals. The movement of the support frames of the lifting frame unit drives different positioning support components to be combined and configured according to the type of pipe fitting. Each of the positioning and supporting components includes two opposing wedge-shaped blocks, with a V-shaped supporting surface formed between the two wedge-shaped blocks. Each positioning and supporting component is installed on a corresponding support frame and can be elastically slidably engaged. The locking assembly includes a locking block fixedly installed on the bottom of each wedge-shaped support block, a locking hole opened on the locking block, and a locking pin movably installed via a slide and adapted to the locking hole. The support assembly has a locking position and an unlocking position: when in the locking position, the locking pin is inserted into the corresponding locking hole, and each positioning support component is locked in place for batch positioning of the pipe to be tested; when in the unlocking position, the locking pin is separated from the locking hole, each wedge-shaped support block is in a sliding support state, and the pipe to be tested is supported only by the V-shaped support surface.

2. The multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings according to claim 1, characterized in that, The lifting frame unit specifically includes an upper support frame, a middle support frame, and a lower support frame. The upper support frame is fixedly installed on the inner wall of the testing chamber, while the middle and lower support frames are slidably installed on the inner wall of the testing chamber.

3. The multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings according to claim 2, characterized in that, The plurality of positioning support components include a first positioning group and a second positioning group mounted on the upper support frame, a third positioning group mounted on the middle support frame, and a fourth positioning group mounted on the lower support frame.

4. The multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings according to claim 3, characterized in that, The wedge-shaped support block of the first positioning group is elastically slidably engaged with the upper support frame along the left and right; the wedge-shaped support block of the second positioning group is engaged with the upper support frame through a slide block, the slide block is slidably connected to the upper support frame along the front and back, and the wedge-shaped support block of the second positioning group is elastically slidably connected to the slide block along the left and right.

5. The multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings according to claim 3, characterized in that, The wedge-shaped support block of the third positioning group is elastically sliding with the middle support frame along the front and back; the wedge-shaped support block of the fourth positioning group is elastically sliding with the lower support frame along the front and back.

6. The multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings according to claim 3, characterized in that, The third and fourth positioning groups are arranged alternately on the left and right.

7. The multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings according to claim 3, characterized in that, The upper support frame is provided with a first clearance hole for the third positioning group to pass through and a second clearance hole for the wedge-shaped support block of the fourth positioning group to pass through; the middle support frame is provided with a third clearance hole for the wedge-shaped support block of the fourth positioning group to pass through.

8. The multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings according to claim 3, characterized in that, The first positioning group and the second positioning group work together to support straight pipes; the first positioning group, the second positioning group and the third positioning group work together to support 90° bends; the first positioning group, the second positioning group, the third positioning group and the fourth positioning group work together to support tee fittings.

9. The multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings according to claim 1, characterized in that, The locking assembly includes multiple slides, which are slidably installed on the bottom of each support frame. Locking pins are fixedly installed on the slides, and the slides drive the locking pins to insert into or disengage from the corresponding locking holes.

10. A multi-station pressure testing device for chlorinated polyvinyl chloride pipe fittings according to claim 1, characterized in that, The chassis also includes a cover that fits over the top of the chassis; each support frame has a flow channel, which is a strip-shaped channel that runs through the thickness of each support frame.

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