Novel plastic tensile property test fixture

Abstract

The utility model aims to provide the novel plastic tensile property test fixture which is compact in structure, can clamp and fix samples with different specifications, and has a good self-locking effect. The clamping assembly is rotationally connected with the shell and used for clamping a sample, the adjusting assembly is arranged on the upper portion of the shell and used for pushing the clamping assembly, and the adjusting assembly comprises a connecting frame fixedly connected with the shell and a downward pressing frame connected with the clamping assembly in a hinged mode. The pressing block is in threaded fit with the connecting frame and used for pushing the lower pressing frame, a horn mouth matched with the lower pressing frame is formed in the pressing block, two pressing rods hinged to the clamping assembly are formed on the lower pressing frame, and a limiting piece is arranged in the middle of each pressing rod. And an elastic piece is arranged between each limiting piece and the shell. The tensile property test clamp is applied to the technical field of tensile property test clamps.

Description

Technical Field

[0001] This utility model relates to the technical field of tensile property testing fixtures, and in particular to a novel plastic tensile property testing fixture. Background Technology

[0002] Plastic products are primarily manufactured using plastic particles through melt injection molding. These products need to exhibit various properties, with tensile properties being a crucial indicator. Plastics with different tensile properties are suitable for different products, and tensile property testing is an important means of evaluating material performance during the research and development of plastic materials. By testing the tensile properties of plastic materials prepared with different formulations and processes, material formulations and process parameters can be optimized to improve material performance.

[0003] Currently, commonly used tensile testing machine clamps employ clamps to hold the specimen. Static friction is generated by the patterns on the clamping surfaces and the clamping force applied to the specimen, preventing relative movement between the specimen and the clamps during tensile testing and ensuring accurate results. This type of clamp is widely applicable; however, for thicker specimens, which require greater tensile force, a large clamping force is needed to maintain sufficient static friction and prevent relative movement. During the tensile test, the plastic specimen is clamped between two clamping heads, and then the upper clamping head rises to achieve the tensile effect. Existing plastic tensile property testing machines have clamping devices that are inconvenient to replace, cumbersome to operate, and prone to instability during lifting and lowering. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a novel plastic tensile property testing fixture with a compact structure, capable of clamping and fixing samples of different specifications and having a good self-locking effect.

[0005] The technical solution adopted by this utility model is as follows: This utility model includes a shell, a clamping assembly rotatably connected to the shell for clamping a sample, and an adjusting assembly disposed on the upper part of the shell for pushing the clamping assembly. The adjusting assembly includes a connecting frame fixedly connected to the shell, a lower pressing frame hingedly connected to the clamping assembly, and a pressing block threadedly engaged with the connecting frame for pushing the lower pressing frame. The pressing block forms a flared opening that cooperates with the lower pressing frame. The lower pressing frame forms two pressing rods, both of which are hingedly connected to the clamping assembly. A limiting piece is provided in the middle of each pressing rod, and an elastic element is provided between each limiting piece and the shell.

[0006] Furthermore, a support plate is formed inside the outer casing, and a guide pin is formed in the middle of the support plate for guiding and engaging the connecting frame. Through holes are formed on both sides of the guide pin for the pressure block to pass through. A rotating column is formed at the lower part of the support plate for the clamping assembly to rotate and connect. The rotating column is fixedly connected to the outer casing by locking screws.

[0007] Furthermore, the lower end of the outer casing is formed with a clamping opening for workers to insert samples.

[0008] Furthermore, the clamping assembly includes a first clamping block, a second clamping block, two pressure plates, and two sets of extrusion blocks. The first clamping block and the second clamping block are rotatably connected to the rotating column. The second clamping block has a rotating groove that cooperates with the first clamping block. A connecting column is provided at the upper end of the first clamping block and the second clamping block. Each connecting column is hinged to the corresponding pressure rod. Each pressure plate is disposed in the middle of the first clamping block or the second clamping block. Each extrusion block is rotatably connected to the lower end of the first clamping block or the second clamping block.

[0009] Furthermore, the pressing sheet is formed with a number of serrated patterns to increase friction, and the surface of the extrusion block is provided with a number of anti-slip strips to increase friction.

[0010] Furthermore, the upper end of the connecting frame is formed with a connecting ring for connection to an external tension mechanism.

[0011] Furthermore, a pressure ring adapted to the flared opening is formed on the upper part of the pressure block.

[0012] Furthermore, the upper part of the pressure block has several push pins for manual pushing and turning.

[0013] The beneficial effects of this utility model are as follows: Because this utility model uses a threaded connection for adjusting the clamping assembly, the flared structure formed by the pressure block applies downward pressure to the pressure ring of the lower pressure frame from top to bottom. The intersecting pressure rod drives the first and second pressure blocks to move closer to each other, so that the extrusion block clamps and fixes the plastic sample. The pressure block locks its position through the self-locking structure of the thread, providing a stable and effective locking force. The threaded downward pressing structure is simple and effective, making it convenient for workers to insert the plastic sample with one hand while adjusting the opening and closing angle of the clamping assembly by turning the pressure block knob with the other hand, thus improving the efficiency of clamping and removing the plastic sample. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is an exploded view of this utility model;

[0016] Figure 3This is a cross-sectional view of the present invention;

[0017] Figure 4 This is a cross-sectional view of the outer casing of this utility model;

[0018] Figure 5 This is a schematic diagram of the clamping assembly of this utility model;

[0019] Figure 6 This is a schematic diagram of the structure of the adjustment component of this utility model.

[0020] In the diagram: 1. Outer shell; 11. Support plate; 12. Guide pin; 13. Through hole; 14. Rotating column; 2. Clamping assembly; 21. First clamping block; 22. Second clamping block; 23. Pressure plate; 24. Extrusion block; 25. Rotating groove; 26. Connecting column; 3. Adjusting assembly; 31. Connecting frame; 32. Lower pressure frame; 33. Pressure block; 34. Flared mouth; 35. Pressure rod; 36. Limiting plate; 37. Elastic element; 38. Connecting ring; 39. Push column. Detailed Implementation

[0021] like Figures 1 to 6 As shown, in this embodiment, the present invention includes a housing 1, a clamping assembly 2 rotatably connected to the housing 1 for clamping a sample, and an adjusting assembly 3 disposed on the upper part of the housing 1 for pushing the clamping assembly 2. The adjusting assembly 3 includes a connecting frame 31 fixedly connected to the housing 1, a lower pressure frame 32 hingedly connected to the clamping assembly 2, and a pressure block 33 threadedly engaged with the connecting frame 31 for pushing the lower pressure frame 32. The pressure block 33 forms a flared opening 34 that cooperates with the lower pressure frame 32. The lower pressure frame 32 forms two pressure rods 35, both hingedly connected to the clamping assembly 2. A limiting piece 36 is provided in the middle of each pressure rod 35. An elastic element 37 is provided between each limiting piece 36 and the housing 1. Connecting pieces are provided on both sides of the connecting frame 31. The connecting frame 31 is connected to the housing 1 by two sets of connecting pieces and multiple screws. The shell 1 is fixedly connected, and the elastic element 37 is a compression spring. When the pressure block 33 moves away from the pressure rod 35, the lower pressure frame 32 moves upward under the action of the elastic element 37. The first clamping block 21 and the second clamping block 22 open under the upward pulling force of the lower pressure frame 32, making it easier for the staff to put in the plastic sample. The pressure block 33 with threaded connection adjusts the opening and closing of the clamping assembly 2. The flared mouth 34 structure formed by the pressure block 33 applies downward pressure to the pressure ring of the lower pressure frame 32 from top to bottom. The pressure rod 35 drives the first pressure block 33 and the second pressure block 33 to move closer to each other, so that the extrusion block 24 clamps and fixes the plastic sample. The pressure block 33 locks its position through the self-locking structure of the thread, providing a stable and effective locking force. The threaded downward pressing structure is simple and effective, making it easy for the staff to put in the plastic sample with one hand while adjusting the opening and closing angle of the clamping assembly 2 by turning the pressure block 33 with the other hand, thus improving the efficiency of clamping and taking out the plastic sample.

[0022] In this embodiment, a support plate 11 is formed inside the outer shell 1. A guide pin 12 is formed in the middle of the support plate 11 for guiding and engaging the connecting frame 31. Through holes 13 are formed on both sides of the guide pin 12 for the pressure block 33 to pass through. A rotating column 14 is formed at the lower part of the support plate 11 for the clamping assembly 2 to rotate and connect. The rotating column 14 is fixedly connected to the outer shell 1 by locking screws. The support plate 11 structure is used for the elastic element 37, and the guide pin 12 is used for the quick positioning and installation of the connecting frame 31, reducing the difficulty of alignment.

[0023] In this embodiment, the lower end of the outer shell 1 is formed with a clamping opening 15 for workers to put in the sample. The clamping opening 15 structure facilitates workers to put in the plastic sample, and at the same time facilitates the protection of the clamping components 2 on both sides of the outer shell 1 from collision.

[0024] In this embodiment, the clamping assembly 2 includes a first clamping block 21, a second clamping block 22, two pressure plates 23, and two sets of pressing blocks 24. The first clamping block 21 and the second clamping block 22 are rotatably connected to the rotating column 14. The second clamping block 22 has a rotating groove 25 that mates with the first clamping block 21. A connecting post 26 is provided at the upper end of both the first clamping block 21 and the second clamping block 22. Each connecting post 26 is hinged to a corresponding pressure rod 35. Each pressure plate 23 is correspondingly disposed on the first clamping block 21. The middle of the clamping block 21 or the second clamping block 22, each of the extrusion blocks 24 is rotatably connected to the lower end of the first clamping block 21 or the second clamping block 22. The pressure plate 23 and the extrusion block 24 are both made of rubber and have good friction performance. The middle of the first clamping block 21 and the second clamping block 22 has a groove. The pressure plate 23 is inclinedly arranged in the groove. The pressure plate 23 is used to limit the multi-face extrusion of large or irregularly shaped plastic samples. It works with the rotatable extrusion block 24 to form a multi-point extrusion to increase friction, thereby clamping the plastic sample.

[0025] In this embodiment, the pressing plate 23 is formed with a plurality of serrated patterns to increase friction, and the surface of the extrusion block 24 is provided with a plurality of anti-slip strips to increase friction.

[0026] In this embodiment, the upper end of the connecting frame 31 is formed with a connecting ring 38 for connecting to an external tension mechanism. The structure of the connecting ring 38 facilitates the connection to an external tension output mechanism.

[0027] In this embodiment, the upper part of the pressure block 33 is formed with a pressure ring adapted to the flared mouth 34. The circular pressure ring structure is adapted to the flared mouth 34, and the downward pressure received from the flared mouth 34 is uniform, ensuring that the first clamping block 21 and the second clamping block 22 in the clamping assembly 2 are subjected to the same downward pressure, and stably clamping the plastic sample.

[0028] In this embodiment, the upper part of the pressure block 33 is formed with a plurality of push pins 39 for manual pushing and turning.

[0029] The working principle of this utility model:

[0030] Before use, the pressure block 33 is located above the connecting frame 31. The lower pressure frame 32 pulls the first clamping block 21 and the second clamping block 22 under the push of the elastic frame, so that the clamping assembly 2 is in the open state.

[0031] When the staff puts in the plastic sample, they grab the plastic sample with one hand and turn the knob 33 with the other hand to adjust the opening angle of the clamping assembly 2. The flared structure 34 formed by the pressure block 33 applies downward pressure to the pressure ring of the lower pressure frame 32 from top to bottom. The pressure rod 35 drives the first pressure block 33 and the second pressure block 33 to move closer to each other, so that the extrusion block 24 clamps and fixes the plastic sample. The pressure block 33 locks its position through the self-locking structure of the thread, providing a stable and effective locking force.

[0032] Although the embodiments of this utility model are described with reference to actual solutions, they do not constitute a limitation on the meaning of this utility model. For those skilled in the art, modifications to the implementation schemes and combinations with other schemes based on this specification are obvious.

Claims

1. A novel plastic tensile property testing fixture, characterized in that: The device includes a housing (1), a clamping assembly (2) rotatably connected to the housing (1) for clamping a sample, and an adjusting assembly (3) disposed on the upper part of the housing (1) for pushing the clamping assembly (2). The adjusting assembly (3) includes a connecting frame (31) fixedly connected to the housing (1), a lower pressure frame (32) hinged to the clamping assembly (2), and a pressure block (33) threadedly engaged with the connecting frame (31) for pushing the lower pressure frame (32). The pressure block (33) has a flared opening (34) that cooperates with the lower pressure frame (32). The lower pressure frame (32) has two pressure rods (35) that are hinged to the clamping assembly (2). Each pressure rod (35) has a limiting piece (36) in the middle. Each limiting piece (36) has an elastic element (37) between it and the housing (1).

2. The novel plastic tensile property testing fixture according to claim 1, characterized in that: A tray (11) is formed inside the outer shell (1). A guide pin (12) is formed in the middle of the tray (11) for guiding and engaging the connecting frame (31). Through holes (13) are formed on both sides of the guide pin (12) for the pressure block (33) to pass through. A rotating column (14) is formed at the lower part of the tray (11) for the clamping assembly (2) to rotate and connect. The rotating column (14) is fixedly connected to the outer shell (1) by locking screws.

3. A novel plastic tensile property testing fixture according to claim 2, characterized in that: The lower end of the outer shell (1) is formed with a clamping opening (15) for workers to insert samples.

4. A novel plastic tensile property testing fixture according to claim 2, characterized in that: The clamping assembly (2) includes a first clamping block (21), a second clamping block (22), two pressure plates (23), and two sets of extrusion blocks (24). The first clamping block (21) and the second clamping block (22) are rotatably connected to the rotating column (14). The second clamping block (22) has a rotating groove (25) that cooperates with the first clamping block (21). The upper end of the first clamping block (21) and the second clamping block (22) is provided with a connecting column (26). Each connecting column (26) is hinged to the corresponding pressure rod (35). Each pressure plate (23) is located in the middle of the first clamping block (21) or the second clamping block (22). Each extrusion block (24) is rotatably connected to the lower end of the first clamping block (21) or the second clamping block (22).

5. A novel plastic tensile property testing fixture according to claim 4, characterized in that: The pressing plate (23) has a number of serrated patterns to increase friction, and the surface of the extrusion block (24) is provided with a number of anti-slip strips to increase friction.

6. A novel plastic tensile property testing fixture according to claim 1, characterized in that: The upper end of the connecting frame (31) is formed with a connecting ring (38) for connecting to an external tension mechanism.

7. A novel plastic tensile property testing fixture according to claim 1, characterized in that: The upper part of the pressure block (33) has a pressure ring that is adapted to the flared mouth (34).

8. A novel plastic tensile property testing fixture according to claim 1, characterized in that: The upper part of the pressure block (33) has a plurality of push rods (39) for manual pushing and turning.

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