Plastic pipe fitting compression deformation test device
By designing a compression deformation test device for plastic pipe fittings including frame, fixed pressure plate, dynamic pressure plate and ruler, the problem of complex detection methods and long detection time of existing detection methods is solved, and the rapid and efficient detection of the structural strength of injection-molded thermoplastic plastic pipe fittings is achieved.
Patent Information
- Application Number
- CN202421899963.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-06
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-06
AI Technical Summary
The existing detection methods are complex and have a long detection time, so it is impossible to quickly and efficiently detect the structural strength of injection-molded thermoplastic pipe fittings.
A pressure deformation test device for plastic pipe fittings is designed, including a frame, a fixed pressure plate, a dynamic pressure plate and a ruler. By moving the dynamic pressure plate, the pipe fittings are applied lateral pressure until the specified deformation amount is reached, and the failure mode is observed to judge the strength of the pipe fittings.
It realizes rapid and efficient detection of the structural strength of injection-molded thermoplastic plastic pipe fittings, and can intuitively obtain information on whether the pipe fittings are tear, stretched, shear or other forms of damage, meeting design needs.
Smart Images
Figure CN222994194U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of plastic pipe fitting detection, and relates to a device for testing the compression deformation of plastic pipe fittings. Background Art
[0002] When thermoplastic pipe fittings are subjected to lateral pressure, they will experience a process from elastic deformation, plastic deformation, compression molding deformation to shear deformation. At present, for injection-molded pipe fittings that bear internal water pressure, the strength detection item is the hydrostatic test. During the test, the pipe fittings need to be connected to the pipes for the hydrostatic test. The state adjustment time of the hydrostatic test is at least 1 hour, and the specific time depends on different test standards and pipe requirements. For example, for adhesive-connected unplasticized polyvinyl chloride (PVC-U) water supply pipe fittings, they need to be bonded and cured with the pipes and then state-adjusted before the hydrostatic test, and the curing time generally exceeds 24 hours. For random copolymer polypropylene (PP-R) pipe fittings for cold and hot water, they need to be heat-fused with the pipes and then state-adjusted before the hydrostatic test. When the wall thickness of the pipe fittings exceeds 3 mm, according to the standard of "Determination of the Resistance to Internal Pressure of Thermoplastic Pipe Systems for Fluid Transportation" GB / T 6111-2018 for the hydrostatic test, the state adjustment time should be 3 hours ± 15 minutes. For injection-molded pipe fittings that do not bear internal water pressure, the strength detection items are the oven test and the 0°C drop test. For the oven test and the 0°C drop test, in order to ensure the accuracy and objectivity of the test results, both the oven test and the 0°C drop test require test temperature pretreatment, and different standards have different requirements for the test temperature pretreatment time. For example, the 2A standard requires 6 hours, while the 3A standard requires 12 hours.
[0003] In summary, using the existing detection methods, the methods are complex and the required detection time is long, so the structural strength of injection-molded thermoplastic pipe fittings cannot be detected quickly and efficiently. Summary of the Invention
[0004] The purpose of the utility model is to provide a device for testing the compression deformation of plastic pipe fittings in view of the above problems existing in the prior art. The technical problem to be solved by the utility model is how to quickly and efficiently detect the structural strength of injection-molded thermoplastic pipe fittings.
[0005] The purpose of the utility model can be realized by the following technical solutions:
[0006] A plastic pipe compression deformation testing device comprises a frame, characterized in that a fixed pressure plate and a dynamic pressure plate opposite to each other up and down and a scale arranged perpendicular to the dynamic pressure plate are arranged on the frame, the fixed pressure plate is fixedly connected to the frame, the dynamic pressure plate can be movably arranged on the frame up and down, the end of the dynamic pressure plate has a pointed part, the scale is located beside the dynamic pressure plate and the pointed part points to the scale line of the scale, and the upper end of the scale extends to above the fixed pressure plate.
[0007] During the test, the user only needs to place the pipe sample to be tested between the fixed pressure plate and the dynamic pressure plate, and then move the dynamic pressure plate so that the fixed pressure plate and the dynamic pressure plate are in contact with the surface of the pipe sample to be tested at the same time. At this time, read the scale value of the ruler corresponding to the tip of the dynamic pressure plate. The scale value of the ruler is the initial value, and then further move the dynamic pressure plate until the difference between the scale value of the ruler corresponding to the tip of the pressure plate and the initial value reaches the deformation value specified for the pipe to be tested. Then, the user only needs to observe and analyze the failure mode of the plastic pipe when it is subjected to lateral pressure, and can intuitively obtain information on whether the plastic pipe has tearing, stretching, shearing or other forms of failure, so as to determine whether the strength of the pipe meets the design requirements, thereby realizing rapid and efficient detection of the structural strength of injection molded thermoplastic plastic pipes.
[0008] In the above-mentioned plastic pipe compression deformation test device, a reference block is provided on the ruler, and the reference block can be moved and locked along the length direction of the ruler. By providing the reference block on the ruler, during the test, the movement of the dynamic pressure plate can be completed by simply moving the tip of the dynamic pressure plate to the position where the reference block is located. The operation is intuitive and convenient, so that the structural strength of the injection molded thermoplastic plastic pipe can be quickly and efficiently tested.
[0009] In the above-mentioned plastic pipe compression deformation test device, the reference block is sleeved on the ruler and connected to the ruler by bolts. When the reference block needs to be moved, the bolts can be removed. When the reference block position is adjusted, the reference block can be fixed to the ruler again by bolts, so that the reference block can be better moved and locked along the length direction of the ruler.
[0010] In the above-mentioned plastic pipe compression deformation test device, the lower end face of the reference block is flush with the scale line of the ruler. Through the cooperation between the pointed head and the reference block, the specified deformation amount of the pipe to be tested can be more easily set by moving the position of the reference block on the ruler, and the specified deformation amount can be completed by moving the pointed head of the dynamic pressure plate to the position where the lower end face of the reference block is located, and the operation is more intuitive and convenient.
[0011] In the above-mentioned plastic pipe compression deformation test device, a pressure seat and a plurality of guide pillars are provided on the frame, the two ends of the fixed pressure plate are respectively fixedly connected to the guide pillars, and the middle part of the fixed pressure plate is fixedly connected to the pressure seat. The above-mentioned structure enables the fixed pressure plate to be more firmly arranged on the frame, and avoids bending and deformation of the fixed pressure plate during the test.
[0012] In the above-mentioned plastic pipe deformation test device, the bottom surface of the pressure seat and the upper side surface of the fixed pressure plate are arranged close to each other. The above-mentioned structure makes the contact area between the pressure seat and the fixed pressure plate large, so that the pressure seat can better support the fixed pressure plate, further avoiding bending deformation of the fixed pressure plate during the test.
[0013] In the above-mentioned plastic pipe compression deformation test device, a driving member is provided on the frame, the output shaft of the driving member is vertically arranged upward, the two ends of the dynamic pressure plate are respectively movably mounted on the guide pillars, and the middle part of the dynamic pressure plate is connected to the output shaft of the driving member. The driving member can be a cylinder or an oil cylinder, and the two ends of the dynamic pressure plate are mounted on the guide pillars, and the middle part of the dynamic pressure plate is connected to the output shaft of the driving member, so that the movement of the dynamic pressure plate is more stable and accurate.
[0014] In the above-mentioned plastic pipe compression deformation test device, the surfaces facing each other of the fixed pressure plate and the dynamic pressure plate are planes perpendicular to the axis of the scale. The above-mentioned structure can ensure that the surfaces of the fixed pressure plate and the dynamic pressure plate in contact with the pipe sample to be tested are horizontally arranged planes, thereby ensuring the accuracy of the test results.
[0015] Compared with the prior art, the advantage of the present plastic pipe compression deformation testing device is that the compression deformation test of the pipes by the present plastic pipe compression deformation testing device can more conveniently and quickly evaluate the plasticization degree, weld line strength, whether there are local defects, etc. of the injection-molded thermoplastic plastic pipes, that is, by observing and analyzing the failure mode of the plastic pipes when subjected to lateral pressure, it is possible to intuitively obtain information on whether the plastic pipes have tearing, stretching, shearing or other forms of failure, thereby achieving rapid and efficient detection of the structural strength of the injection-molded thermoplastic plastic pipes. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the plastic pipe compression deformation testing device.
[0017] In the figure, 1, frame; 2, fixed pressure plate; 2a, upper side; 3, dynamic pressure plate; 3a, pointed head; 4, ruler; 4a, scale line; 5, reference block; 5a, lower end surface; 6, bolt; 7, pressure seat; 7a, bottom surface; 8, guide column; 9, driving member; 9a, output shaft. DETAILED DESCRIPTION
[0018] The following are specific embodiments of the present utility model and, in conjunction with the accompanying drawings, further describe the technical solutions of the present utility model, but the present utility model is not limited to these embodiments.
[0019] A plastic pipe fitting compression deformation test device, referring to Figure 1 , includes a frame 1, on which there are a fixed pressure plate 2 and a moving pressure plate 3 that are opposite up and down, and a scale 4 that is vertically arranged with respect to the moving pressure plate 3. The fixed pressure plate 2 is fixedly connected to the frame 1, the moving pressure plate 3 is movably arranged up and down on the frame 1, the end of the moving pressure plate 3 has a pointed head 3a, the scale 4 is located beside the moving pressure plate 3 and the pointed head 3a points to the scale line 4a of the scale 4, and the upper end of the scale 4 extends above the fixed pressure plate 2.
[0020] Specifically, referring to Figure 1 , a pressure bearing seat 7 and several guide columns 8 are arranged on the frame 1. The two ends of the fixed pressure plate 2 are respectively fixedly connected to the guide columns 8, and the middle part of the fixed pressure plate 2 is fixedly connected to the pressure bearing seat 7; a driving member 9 is arranged on the frame 1, the output shaft 9a of the driving member 9 is arranged vertically upward, the two ends of the moving pressure plate 3 are respectively movably sleeved on the guide columns 8, and the middle part of the moving pressure plate 3 is connected to the output shaft 9a of the driving member 9. In this embodiment, it is preferred that the driving member 9 is a cylinder or an oil cylinder; it is preferred that the opposite surfaces of the fixed pressure plate 2 and the moving pressure plate 3 are respectively planes that are perpendicular to the axis line of the scale 4; the bottom surface 7a of the pressure bearing seat 7 and the upper side surface 2a of the fixed pressure plate 2 are in abutting contact.
[0021] Furthermore, referring to Figure 1 , a reference block 5 is arranged on the scale 4, and the reference block 5 can move along the length direction of the scale 4 and be locked; the reference block 5 is sleeved on the scale 4 and is connected to the scale 4 through a bolt 6. In this embodiment, it is preferred that the lower end surface 5a of the reference block 5 is flush with the scale line 4a of the scale 4.
[0022] The working principle of this plastic pipe fitting compression deformation test device is described below:
[0023] First, the user horizontally places the pipe fitting sample to be tested between the fixed pressure plate 2 and the moving pressure plate 3 (if there are obvious welding marks on the pipe fitting sample to be tested, the part with the welding marks on the pipe fitting sample to be tested needs to be horizontally placed at the middle position between the fixed pressure plate 2 and the moving pressure plate 3, referring to Figure 1 , the fixed pressure plate 2 is above the moving pressure plate 3, and at this time, the user can first hold the pipe fitting sample to be tested by hand or with an auxiliary tool; of course, the fixed pressure plate 2 can also be arranged below the moving pressure plate 3, and at this time, the user only needs to place the pipe fitting sample to be tested on the fixed pressure plate 2).
[0024] Next, the driving member 9 drives the movable pressure plate 3 to move towards the fixed pressure plate 2 until both the fixed pressure plate 2 and the movable pressure plate 3 are in contact with the surface of the pipe fitting sample to be tested. At this time, under the clamping action of the fixed pressure plate 2 and the movable pressure plate 3, the position of the pipe fitting sample to be tested will not shift randomly;
[0025] Then, the driving member 9 controls the movable pressure plate 3 to further move towards the fixed pressure plate 2 at a constant rate to apply a force to the pipe fitting sample to be tested (at this time, the moving speed of the movable pressure plate 3 is 5 mm / min - 100 mm / min) until the upper and lower inner walls of the pipe fitting to be tested are in contact or the pipe fitting is pressed to the specified deformation amount; Finally, the user observes the rupture condition of the pipe fitting sample to be tested, that is, information such as whether the pipe fitting sample to be tested shows tearing, stretching, shearing or other damage forms, and then judges whether its strength meets the design requirements.
[0026] It should be noted that if the pipe fitting to be tested is made of polyolefin material, it is necessary to press the pipe fitting to be tested until its upper and lower inner walls are in contact; if the pipe fitting to be tested is made of rigid polyvinyl chloride material, the specified deformation amount of the pipe fitting to be tested is 20% - 60% of the outer diameter of the pipe fitting. At this time, it is necessary to move the reference block 5 along the length direction of the scale 4 until the difference between the scale value corresponding to the lower end surface 5a of the reference block 5 and the scale value corresponding to the tip 3a of the movable pressure plate 3 is adjusted to 20% - 60% of the outer diameter of the pipe fitting to be tested. Then, lock the reference block 5 on the scale 4 through the bolt 6. Finally, control the movable pressure plate 3 to further move towards the fixed pressure plate 2 at a constant rate until the tip 3a of the movable pressure plate 3 is flush with the lower end surface 5a of the reference block 5; if the pipe fitting to be tested is made of chlorinated polyvinyl chloride material, the specified deformation amount of the pipe fitting to be tested is 10% - 50% of the outer diameter of the pipe fitting. At this time, it is necessary to move the reference block 5 along the length direction of the scale 4 until the difference between the scale value corresponding to the lower end surface 5a of the reference block 5 and the scale value corresponding to the tip 3a of the movable pressure plate 3 is adjusted to 10% - 50% of the outer diameter of the pipe fitting to be tested. Then, lock the reference block 5 on the scale 4 through the bolt 6. Finally, control the movable pressure plate 3 to further move towards the fixed pressure plate 2 at a constant rate until the tip 3a of the movable pressure plate 3 is flush with the lower end surface 5a of the reference block 5.
[0027] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. A plastic pipe compression deformation test device, comprising a frame (1), characterized in that: A fixed pressure plate (2) and a dynamic pressure plate (3) facing each other vertically and a scale (4) arranged perpendicularly to the dynamic pressure plate (3) are arranged on the frame (1); the fixed pressure plate (2) is fixedly connected to the frame (1); the dynamic pressure plate (3) is arranged on the frame (1) so as to be movable up and down; the end of the dynamic pressure plate (3) has a pointed portion (3a); the scale (4) is located beside the dynamic pressure plate (3) and the pointed portion (3a) points to a scale line (4a) of the scale (4); and the upper end of the scale (4) extends above the fixed pressure plate (2).
2. A plastic pipe compression deformation testing device according to claim 1, characterized in that: A reference block (5) is arranged on the ruler (4), and the reference block (5) can be moved and locked along the length direction of the ruler (4).
3. A plastic pipe compression deformation testing device according to claim 2, characterized in that: The reference block (5) is sleeved on the scale (4) and connected to the scale (4) via bolts (6).
4. A plastic pipe compression deformation testing device according to claim 2, characterized in that: The lower end surface (5a) of the reference block (5) is flush with the scale line (4a) of the ruler (4).
5. A plastic pipe compression deformation test device according to claim 1, 2, 3 or 4, characterized in that: The frame (1) is provided with a pressure-bearing seat (7) and a plurality of guide pillars (8); the two ends of the fixed pressure plate (2) are respectively fixedly connected to the guide pillars (8); and the middle part of the fixed pressure plate (2) is fixedly connected to the pressure-bearing seat (7).
6. A plastic pipe compression deformation testing device according to claim 5, characterized in that: The bottom surface (7a) of the pressure bearing seat (7) and the upper side surface (2a) of the fixed pressure plate (2) are arranged in close contact with each other.
7. A plastic pipe compression deformation testing device according to claim 5, characterized in that: A driving member (9) is arranged on the frame (1), and an output shaft (9a) of the driving member (9) is arranged vertically upward. Both ends of the dynamic pressure plate (3) are respectively movably sleeved on the guide pillars (8), and the middle part of the dynamic pressure plate (3) is connected to the output shaft (9a) of the driving member (9).
8. A plastic pipe compression deformation test device according to claim 1, 2, 3 or 4, characterized in that: The opposing surfaces of the fixed pressure plate (2) and the dynamic pressure plate (3) are respectively planes arranged perpendicular to the axis of the scale (4).