A positioning fixture for tensile testing of polyurethane mixtures

Abstract

This utility model discloses a positioning fixture for tensile testing of polyurethane mixtures, relating to the field of material testing equipment technology. It includes a base, a worktable fixedly mounted on the base, a slide fixedly mounted on the worktable, a slide rail on the slide, a movable seat slidably mounted in the slide rail, a slot fixedly mounted on the movable seat, a first screw threadedly connected to the movable seat, a first clamping plate rotatably mounted on the first screw, and a lead screw rotatably mounted in the slide rail. Rotating the lead screw adjusts the distance between the two sets of movable seats for initial positioning and clamping of the mixture. Then, rotating the first screw pushes the first clamping plate to move and clamp and fix the mixture, while simultaneously placing the other end of the mixture in a fixed frame. Rotating the second screw pushes the second clamping plate to complete the fixation of the mixture. A cylinder pushes the fixed frame to move in conjunction with the movable seat, allowing for tensile testing of the mixture. This device can quickly position and install the mixture to the center position, making it highly practical.

Description

Technical Field

[0001] This utility model relates to the field of material testing equipment technology, and more specifically, it relates to a positioning fixture for tensile testing of polyurethane mixtures. Background Technology

[0002] Polyurethane is a chemical product made by mixing polyols and isocyanates in a certain proportion. It has excellent mechanical strength, wear resistance, and elasticity, and can replace asphalt in pavement. Due to its good mechanical properties, the splitting strength of polyurethane mixtures is more than three times that of asphalt, resulting in much smaller rheological deformation at high temperatures compared to asphalt mixtures. It exhibits good resistance to high-temperature deformation and fatigue cracking, making it an excellent road paving material. Various performance tests are typically conducted on polyurethane mixtures during production and use to understand their properties, such as density, crack resistance, compressive strength, and tensile strength. During tensile testing of polyurethane mixtures, positioning clamps are needed to fix the specimens onto the tensile testing machine. Existing positioning clamps have poor flexibility, making it difficult to quickly fix the polyurethane mixture in the center position, resulting in poor fixing efficiency and hindering rapid leveling of the entire equipment. Utility Model Content

[0003] (a) Technical problems to be solved In view of the problems existing in the prior art, the present invention provides a positioning fixture for tensile testing of polyurethane mixtures to solve the technical problems mentioned in the background art.

[0004] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a positioning fixture for tensile testing of polyurethane mixtures, comprising a base, a worktable fixedly mounted on the base, a slide fixedly mounted on the worktable, a slide rail provided on the slide rail, a movable seat slidably mounted in the slide rail, a slot fixedly mounted on the movable seat, a first screw threadedly connected to the movable seat, a first clamping plate rotatably mounted on the first screw, a lead screw rotatably mounted in the slide rail and threadedly connected to the movable seat, and a second clamping assembly mounted on the base.

[0005] The present invention is further configured such that the thread directions on both sides of the lead screw are opposite, and two sets of movable seats are provided and symmetrically distributed on the lead screw, so as to facilitate relative movement of the two sets of movable seats.

[0006] The present invention is further configured such that the second clamping assembly includes a cylinder, the cylinder is fixedly mounted on a base, a top plate is fixedly mounted on the cylinder, a fixed seat is fixedly mounted on the top plate, a fixed frame is fixedly mounted on the fixed seat, a second screw is threadedly connected to the fixed frame, and a second clamping plate is rotatably mounted on the second screw to facilitate pushing the top plate and the fixed frame to move.

[0007] The present invention is further configured such that a sliding rod is fixedly provided on the second clamping plate, and the sliding rod slides through the fixing frame to facilitate the stable movement of the second clamping plate.

[0008] The present invention is further configured such that multiple sets of protruding strips are fixedly provided on both the first clamping plate and the second clamping plate to improve the clamping and fixing effect.

[0009] The present invention is further configured such that a column is fixedly installed on the base, and a sliding sleeve is fixedly installed on the top plate. The sliding sleeve is slidably installed on the column to keep the top plate moving stably.

[0010] The present invention is further configured such that a support foot is fixedly provided on the base, a sliding groove is provided on the support foot, a slider is slidably installed in the sliding groove, a base plate is fixedly provided on the slider, and an adjusting bolt is rotatably provided on the base, the adjusting bolt being threadedly connected to the slider to facilitate adjustment of the base level.

[0011] The present invention is further provided that a level is fixedly installed on the base to facilitate observation of the horizontal state.

[0012] (III) Beneficial Effects Compared with the prior art, this utility model provides a positioning fixture for tensile testing of polyurethane mixtures, which has the following advantages: I. By setting up a sliding seat, a movable seat, a first screw, a first clamping plate, a lead screw, a cylinder, a top plate, a fixed seat, a fixed frame, a second screw, and a second clamping plate, when conducting tensile tests on polyurethane mixtures, one end of the mixture is placed in the slot of the movable seat. The lead screw is rotated to adjust the distance between the two sets of movable seats to initially position and clamp the mixture. Then, the first screw is rotated to push the first clamping plate to move and clamp and fix the mixture. At the same time, the other end of the mixture is placed in the fixed frame. The second screw is rotated to push the second clamping plate to complete the fixation of the mixture. The cylinder pushes the fixed frame to move in conjunction with the movable seat to conduct tensile tests on the mixture. The overall structure is simple, the operation is convenient, and the mixture can be quickly positioned and installed in the center position, making it highly practical.

[0013] Second, by setting up convex strips, columns, and sliding sleeves, when testing polyurethane mixtures, the convex strips, together with the first and second clamping plates, enhance the clamping effect on the polyurethane mixtures, improving the safety of the test. With the cooperation of the columns and sliding sleeves, it is easy to maintain the stable movement of the top plate and the fixing frame, effectively improving the accuracy of the test.

[0014] Third, by setting up support legs, sliders, base plates, adjusting bolts, and a level, when installing the equipment, turning the adjusting bolts will push the sliders to move in the support legs, thereby adjusting the height of the four corners of the base. With the help of the level, the base can be quickly leveled, which is highly flexible and practical. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the first axial view structure of this utility model; Figure 2 This is a schematic diagram of the second axial view structure of this utility model; Figure 3 This is a schematic diagram of the structure of the sliding seat and the movable seat in this utility model; Figure 4 This is a schematic diagram of the structure of the fixing base and fixing frame in this utility model; Figure 5 This is a schematic diagram of the slider and base plate in this utility model.

[0016] In the diagram: 1. Base; 2. Workbench; 3. Slide; 4. Movable seat; 5. First screw; 6. First clamping plate; 7. Lead screw; 8. Cylinder; 9. Top plate; 10. Fixed seat; 11. Fixed frame; 12. Second screw; 13. Second clamping plate; 14. Slide rod; 15. Protruding strip; 16. Column; 17. Sliding sleeve; 18. Support leg; 19. Sliding block; 20. Base plate; 21. Adjusting bolt; 22. Level. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0019] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0020] Please see Figures 1-4 A positioning fixture for tensile testing of polyurethane mixtures includes a base 1, a worktable 2 fixedly mounted on the base 1, a slide 3 fixedly mounted on the worktable 2, a slide rail on the slide 3, a movable seat 4 slidably mounted in the slide rail, a slot fixedly mounted on the movable seat 4, a first screw 5 threadedly connected to the movable seat 4, a first clamping plate 6 rotatably mounted on the first screw 5, a lead screw 7 rotatably mounted in the slide rail and threadedly connected to the movable seat 4, a second clamping assembly mounted on the base 1, and two clamping assemblies on both sides of the lead screw 7. With opposite thread directions, the movable seat 4 is provided in two sets and symmetrically distributed on the lead screw 7. The second clamping assembly includes a cylinder 8, which is fixedly installed on the base 1. A top plate 9 is fixedly installed on the cylinder 8, and a fixed seat 10 is fixedly installed on the top plate 9. A fixed frame 11 is fixedly installed on the fixed seat 10. A second screw 12 is threadedly connected to the fixed frame 11. A second clamping plate 13 is rotatably installed on the second screw 12, and a sliding rod 14 is fixedly installed on the second clamping plate 13. The sliding rod 14 slides through the fixed frame 11.

[0021] Specifically, when conducting a tensile test on the polyurethane mixture, one end of the mixture is placed in the slot of the movable seat 4. The screw 7 is rotated to adjust the distance between the two sets of movable seats 4 to initially position and clamp the mixture. Then, the first screw 5 is rotated to push the first clamping plate 6 to move and clamp and fix the mixture. At the same time, the other end of the mixture is placed in the fixed frame 11. The second screw 12 is rotated to push the second clamping plate 13 to complete the fixation of the mixture. The cylinder 8 pushes the fixed frame 11 to move in conjunction with the movable seat 4 to conduct a tensile test on the mixture. The overall structure is simple, the operation is convenient, and the mixture can be quickly positioned and installed in the center position, making it highly practical.

[0022] Please see Figures 1-4 Multiple sets of protruding strips 15 are fixedly provided on the first clamping plate 6 and the second clamping plate 13. A column 16 is fixedly provided on the base 1. A sliding sleeve 17 is fixedly provided on the top plate 9. The sliding sleeve 17 is slidably installed on the column 16.

[0023] Specifically, when testing polyurethane mixtures, the protruding strip 15, together with the first clamping plate 6 and the second clamping plate 13, strengthens the clamping effect on the polyurethane mixture, improves the safety of the test, and with the cooperation of the column 16 and the sliding sleeve 17, it is easy to maintain the stable movement of the top plate 9 and the fixing frame 11, effectively improving the accuracy of the test.

[0024] Please see Figure 1 , Figure 2 and Figure 5 The base 1 is fixedly provided with a support leg 18, the support leg 18 is provided with a sliding groove, the sliding slider 19 is slidably installed in the sliding groove, the slider 19 is fixedly provided with a base plate 20, the base 1 is rotatably provided with an adjusting bolt 21, the adjusting bolt 21 is threadedly connected to the slider 19, and the base 1 is fixedly provided with a level 22.

[0025] Specifically, when installing the equipment, turning the adjusting bolt 21 will push the slider 19 to move in the support leg 18, thereby adjusting the height of the four corners of the base 1. With the help of the level 22, the base 1 can be quickly leveled, which is highly flexible and practical.

[0026] In summary, when using the overall equipment: When performing a tensile test on the polyurethane mixture, one end of the mixture is placed in the slot of the movable seat 4. The screw 7 is rotated to adjust the distance between the two sets of movable seats 4 to initially position and clamp the mixture. Then, the first screw 5 is rotated to push the first clamping plate 6 to move and clamp and fix the mixture. At the same time, the other end of the mixture is placed in the fixed frame 11. The second screw 12 is rotated to push the second clamping plate 13 to complete the fixation of the mixture. The cylinder 8 pushes the fixed frame 11 to move in conjunction with the movable seat 4 to perform a tensile test on the mixture. The overall structure is simple, the operation is convenient, and the mixture can be quickly positioned and installed in the center position, making it highly practical.

[0027] When testing polyurethane mixtures, the protruding strip 15, together with the first clamping plate 6 and the second clamping plate 13, strengthens the clamping effect on the polyurethane mixture, improves the safety of the test, and with the cooperation of the column 16 and the sliding sleeve 17, it is easy to maintain the stable movement of the top plate 9 and the fixing frame 11, effectively improving the accuracy of the test.

[0028] When installing the equipment, turning the adjusting bolt 21 will push the slider 19 to move in the support leg 18, thereby adjusting the height of the four corners of the base 1. With the help of the level 22, the base 1 can be quickly leveled, which is highly flexible and practical.

[0029] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A positioning fixture for tensile testing of polyurethane mixtures, comprising a base (1) on which a worktable (2) is fixedly mounted, characterized in that: A slide block (3) is fixedly installed on the workbench (2). A slide rail is provided on the slide block (3). A movable seat (4) is slidably installed in the slide rail. A slot is fixedly installed on the movable seat (4). A first screw (5) is threadedly connected to the movable seat (4). A first clamping plate (6) is rotatably installed on the first screw (5). A lead screw (7) is rotatably installed in the slide rail and threadedly connected to the movable seat (4). A second clamping assembly is provided on the base (1).

2. The positioning fixture for tensile testing of polyurethane mixtures according to claim 1, characterized in that: The threads on both sides of the lead screw (7) are opposite, and the movable seat (4) is provided in two sets and symmetrically distributed on the lead screw (7).

3. A positioning fixture for tensile testing of polyurethane mixtures according to claim 1, characterized in that: The second clamping assembly includes a cylinder (8), which is fixedly mounted on a base (1). A top plate (9) is fixedly mounted on the cylinder (8), and a fixed seat (10) is fixedly mounted on the top plate (9). A fixed frame (11) is fixedly mounted on the fixed seat (10), and a second screw (12) is threadedly connected to the fixed frame (11). A second clamping plate (13) is rotatably mounted on the second screw (12).

4. A positioning fixture for tensile testing of polyurethane mixtures according to claim 3, characterized in that: A slide rod (14) is fixedly installed on the second clamping plate (13), and the slide rod (14) slides through the fixing frame (11).

5. A positioning fixture for tensile testing of polyurethane mixtures according to claim 3, characterized in that: Multiple sets of protrusions (15) are fixedly provided on the first clamping plate (6) and the second clamping plate (13).

6. A positioning fixture for tensile testing of polyurethane mixtures according to claim 3, characterized in that: A column (16) is fixedly installed on the base (1), and a sliding sleeve (17) is fixedly installed on the top plate (9). The sliding sleeve (17) is slidably installed on the column (16).

7. A positioning fixture for tensile testing of polyurethane mixtures according to claim 1, characterized in that: The base (1) is fixedly provided with a support leg (18), the support leg (18) is provided with a sliding groove, a slider (19) is slidably installed in the sliding groove, a base plate (20) is fixedly provided on the slider (19), and an adjusting bolt (21) is rotatably provided on the base (1), the adjusting bolt (21) is threadedly connected to the slider (19).

8. A positioning fixture for tensile testing of polyurethane mixtures according to claim 1, characterized in that: A level (22) is fixedly installed on the base (1).

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