Tool for detecting fusion strength of fusion seam of injection molding pipe fitting
By designing a tooling for testing the fusion strength of injection molded pipe joints, and utilizing a tensile testing machine and a detachable connection structure, the problem of low efficiency in existing testing methods was solved, and efficient and accurate measurement of fusion joint strength was achieved.
Patent Information
- Application Number
- CN202422915054.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Existing methods for testing the strength of weld joints cannot obtain accurate data, have low testing efficiency, and are not applicable to injection molded pipe fittings of different specifications.
A tooling for testing the fusion strength of injection molded pipe joints was designed, including a tensile testing machine and a detachably connected U-shaped fixing pile and a semi-circular inner support. The strength of the fusion joint is directly measured by the tensile testing machine.
It achieves simple operation and efficient testing, can directly obtain weld strength data, is applicable to injection molded pipe fittings of different specifications, and has a short testing cycle.
Smart Images
Figure CN223650309U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of performance testing equipment for injection molded pipe fittings, specifically relating to a tooling for testing the fusion strength of the weld seam of injection molded pipe fittings, for plastic pipe fittings produced by injection molding process, including but not limited to PE pipe fittings, PP-R pipe fittings, PVC pipe fittings, etc. Background Technology
[0002] Plastic injection molding is a method of molding plastic products. An injection molding machine heats and melts the plastic, then injects it into the cavity of a mold. After cooling and solidification, the melt is demolded. In injection-molded products, when the molten plastic encounters insert holes, areas of discontinuous flow, or areas where the material flow is interrupted, it may converge in multiple streams within the mold cavity. Because these streams cannot completely fuse together, linear weld lines are formed.
[0003] The weld seam is generally the weakest point in the strength of an injection molded part, and its strength directly determines the product's usability. Currently, the main methods for testing weld seam strength are as follows:
[0004] (1) Extrusion method: At the location of the weld, check the appearance of the weld. This method can only qualitatively check whether the weld is broken, but cannot quantitatively determine the data of the weld strength. It can only detect the cracking phenomenon of the weld under poor fusion conditions, and cannot detect the performance of the weld with relatively good fusion.
[0005] (2) Hydrostatic method: The strength of the weld joint is determined by the hydrostatic test time. This method can detect the relative strength of the weld joint, i.e. the hydrostatic test time, but it cannot directly obtain the data of the weld strength. Moreover, the hydrostatic test time is generally relatively long, ranging from tens of hours to hundreds of hours.
[0006] In summary, given the problems with existing testing methods, there is an urgent need to design a new tooling for testing the fusion strength of injection molded pipe joints. Utility Model Content
[0007] To address the aforementioned issues, this utility model provides a tooling for testing the fusion strength of injection molded pipe joints, resolving the technical problems existing in the current extrusion and hydrostatic methods for testing fusion joint strength.
[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0009] A fixture for testing the fusion strength of injection-molded pipe joints includes an upper base of a tensile testing machine, a lower base of a tensile testing machine, a first U-shaped fixing post, a second U-shaped fixing post, a first semi-circular inner support member, and a second semi-circular inner support member. The upper base and the lower base of the tensile testing machine are fixedly connected to the tensile testing machine. The first U-shaped fixing post and the upper base of the tensile testing machine, as well as the second U-shaped fixing post and the lower base of the tensile testing machine, are detachably connected by a first detachable pin. The first semi-circular inner support member and the second semi-circular inner support member are respectively disposed in the U-shaped grooves of the first U-shaped fixing post and the second U-shaped fixing post, and are detachably connected by a second detachable pin.
[0010] Furthermore, the first U-shaped fixing pile and the second U-shaped fixing pile are provided with a connecting part, the upper base and the lower base of the tensile testing machine have a connecting groove corresponding to the connecting part, and the connecting part, the upper base and the lower base of the tensile testing machine are all provided with a through hole corresponding to the first detachable pin, and the detachable connection is achieved by the first detachable pin respectively.
[0011] Furthermore, the first U-shaped fixing pile, the second U-shaped fixing pile, the first semi-circular inner support member, and the second semi-circular inner support member are all provided with through holes corresponding to the second detachable pins, and are respectively detachably connected by the second detachable pins.
[0012] Furthermore, the first semi-circular inner support member and the second semi-circular inner support member have the same length, corresponding to the distance between the inner cavities of the first U-shaped fixing pile and the second U-shaped fixing pile, respectively.
[0013] Furthermore, the dimensions of the circle formed by the first semicircular inner support and the second semicircular inner support match the inner diameter of the injection-molded pipe to be tested.
[0014] Furthermore, anti-collision rubber pads are installed on the U-shaped arms of both the first and second U-shaped fixed piles to prevent collisions when the first and second U-shaped fixed piles come into contact.
[0015] The present invention relates to a tooling for testing the fusion strength of injection molded pipe joints, which features simple operation, high testing efficiency, direct acquisition of fusion strength data, short testing cycle, and applicability to injection molded pipes of different specifications. Attached Figure Description
[0016] Figure 1 Schematic diagram of the welding strength testing fixture for injection molded pipe fittings of this utility model - 1;
[0017] Figure 2 Schematic diagram of the welding strength testing fixture for injection molded pipe fittings of this utility model - 2;
[0018] Figure 3 This is a schematic diagram of the first U-shaped fixed pile structure of this utility model;
[0019] Figure 4 This is a schematic diagram of the base structure of the tensile testing machine of this utility model;
[0020] Figure 5 This is a schematic diagram of the first semi-circular inner support structure of this utility model;
[0021] In the figure: 1. Upper base of tensile testing machine; 2. Lower base of tensile testing machine; 3. First U-shaped fixing post; 4. Second U-shaped fixing post; 5. First semi-circular inner support; 6. Second semi-circular inner support; 7. First detachable pin; 8. Second detachable pin; 9. Anti-collision rubber pad; 10. Connecting part; 11. Connecting groove. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0023] like Figure 1 and Figure 2 As shown, this utility model provides a new tooling for testing the strength of weld joints, which features simple operation, high testing efficiency, direct acquisition of weld strength data, short testing cycle, and applicability to injection molded pipe fittings of different specifications. The specific structure is as follows:
[0024] A fixture for testing the fusion strength of injection-molded pipe joints includes an upper base 1 of a tensile testing machine, a lower base 2 of a tensile testing machine, a first U-shaped fixing post 3, a second U-shaped fixing post 4, a first semi-circular inner support 5, and a second semi-circular inner support 6. The upper base 1 and the lower base 2 of the tensile testing machine are fixedly connected to the tensile testing machine. The first U-shaped fixing post 3 and the upper base 1 of the tensile testing machine, as well as the second U-shaped fixing post 4 and the lower base 2 of the tensile testing machine, are detachably connected by a first detachable pin 7. The first semi-circular inner support 5 and the second semi-circular inner support 6 are respectively disposed in the U-shaped grooves of the first U-shaped fixing post 3 and the second U-shaped fixing post 4 and are detachably connected by a second detachable pin 8.
[0025] The first U-shaped fixing pile 3 and the second U-shaped fixing pile 4 are provided with connecting parts 10 for connection. The upper base 1 and the lower base 2 of the tensile testing machine have connecting grooves 11 corresponding to the connecting parts 10. When connected, the connecting parts 10 are inserted into the connecting grooves 11. The connecting parts 10, the upper base 1 and the lower base 2 of the tensile testing machine are all provided with through holes corresponding to the first detachable pins 7, and are detachably connected by the first detachable pins 7. Similarly, the first U-shaped fixing pile 3, the second U-shaped fixing pile 4, the first semi-circular inner support 5 and the second semi-circular inner support 6 are all provided with through holes corresponding to the second detachable pins 8, and are detachably connected by the second detachable pins 8.
[0026] Preferably, the first semi-circular inner support member 5 and the second semi-circular inner support member 6 have the same length, and correspond to the inner cavity spacing of the first U-shaped fixing pile 3 and the second U-shaped fixing pile 4, respectively.
[0027] Preferably, the size of the circle formed by the first semicircular inner support 5 and the second semicircular inner support 6 matches the inner diameter of the injection-molded pipe to be tested.
[0028] Preferably, anti-collision rubber pads 9 are provided on the U-shaped arms of the first U-shaped fixed pile 3 and the second U-shaped fixed pile 4 to prevent collisions when the first U-shaped fixed pile 3 and the second U-shaped fixed pile 4 come into contact.
[0029] The installation and testing process of the testing fixture of this utility model are as follows:
[0030] (1) Use the first detachable pin 7 to install the first U-shaped fixing pile 3 and the second U-shaped fixing pile 4 onto the upper base 1 and the lower base 2 of the tensile testing machine, respectively;
[0031] (2) Remove the first semi-circular inner support 5 and the second semi-circular inner support 6, which are fixed by the second detachable pin 8, from the first U-shaped fixed pile 3 and the second U-shaped fixed pile 4 respectively;
[0032] (3) The annular injection-molded plastic part with the weld seam is placed on the outside of the whole circular component structure composed of the first semi-circular inner support 5 and the second semi-circular inner support 6. The weld seam should be located at the junction of the first semi-circular inner support 5 and the second semi-circular inner support 6.
[0033] (4) Use the second detachable pin 8 to install and fix the semi-circular inner support assembly with injection-molded plastic parts to the first U-shaped fixing post 3 and the second U-shaped fixing post 4;
[0034] (5) Use a tensile testing machine to stretch the first U-shaped fixing post 3 and the second U-shaped fixing post 4 up and down at a speed of 5-10 mm / s until the annular injection-molded plastic part with the weld seam breaks.
[0035] (6) Determine the fusion strength of the weld seam based on the tensile strength.
[0036] It should be noted that the semi-circular inner support of this utility model is suitable for testing samples with tubular structures containing welded joints. If the sample has an irregular structure, the shape of the inner support can be adjusted according to the sample.
[0037] Different specifications of injection molded pipe fittings can be used to make accessories such as U-shaped fixing piles and semi-circular internal supports of different sizes for adaptation.
[0038] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. A tooling for testing the fusion strength of injection molded pipe joints, characterized in that, The tensile testing machine includes an upper base (1), a lower base (2), a first U-shaped fixing pile (3), a second U-shaped fixing pile (4), a first semi-circular inner support (5), and a second semi-circular inner support (6). The upper base (1) and the lower base (2) are fixedly connected to the tensile testing machine. The first U-shaped fixing pile (3) and the upper base (1) are detachably connected, as are the second U-shaped fixing pile (4) and the lower base (2), through a first detachable pin (7). The first semi-circular inner support (5) and the second semi-circular inner support (6) are respectively set in the U-shaped grooves of the first U-shaped fixing pile (3) and the second U-shaped fixing pile (4) and are detachably connected through a second detachable pin (8).
2. The tooling for testing the fusion strength of injection molded pipe joints according to claim 1, characterized in that, The first U-shaped fixed pile (3) and the second U-shaped fixed pile (4) are provided with a connecting part (10). The upper base (1) and the lower base (2) of the tensile testing machine have a connecting groove (11) corresponding to the connecting part (10). The connecting part (10), the upper base (1) and the lower base (2) of the tensile testing machine are all provided with a through hole corresponding to the first detachable pin (7), and the detachable connection is achieved by the first detachable pin (7).
3. The tooling for testing the fusion strength of injection molded pipe joints according to claim 1, characterized in that, The first U-shaped fixing pile (3), the second U-shaped fixing pile (4), the first semi-circular inner support (5) and the second semi-circular inner support (6) are all provided with through holes corresponding to the second detachable pin (8), and are respectively detachably connected through the second detachable pin (8).
4. The tooling for testing the fusion strength of injection molded pipe joints according to claim 1, characterized in that, The first semi-circular inner support (5) and the second semi-circular inner support (6) have the same length, and correspond to the inner cavity spacing of the first U-shaped fixed pile (3) and the second U-shaped fixed pile (4), respectively.
5. The tooling for testing the fusion strength of injection molded pipe joints according to claim 1, characterized in that, The size of the circle formed by the first semi-circular inner support (5) and the second semi-circular inner support (6) matches the inner diameter of the injection-molded pipe to be tested.
6. The tooling for testing the fusion strength of injection molded pipe joints according to claim 1, characterized in that, Anti-collision rubber pads (9) are provided on the U-shaped arms of the first U-shaped fixed pile (3) and the second U-shaped fixed pile (4) to prevent collision when the first U-shaped fixed pile (3) and the second U-shaped fixed pile (4) come into contact.