Fixture for shearing test of PET (Polyethylene Terephthalate) foam board

Abstract

The utility model discloses a clamp for a shearing test of a PET (Polyethylene Terephthalate) foam board, which comprises a base, a left fixed vertical plate is arranged at one end of the base, a right fixed vertical plate is arranged at the other end of the base, and a group of supporting rods and a clamping plate capable of moving back and forth are arranged between the left fixed vertical plate and the right fixed vertical plate. The right fixed vertical plate is further provided with a locking device used for driving the clamping plate to move towards the left fixed vertical plate and locking the clamping plate. According to the utility model, the bonding uniformity between the PET plate and the special metal plate for detection can be ensured, so that the data of the shearing test is more accurate and reliable, and the device can be widely applied to the field of PET foamed plate testing.

Description

Technical Field

[0001] The utility model relates to the field of PET plate testing, in particular to a clamp for shear testing of PET foam plates. Background Art

[0002] PET foam sheets have good heat resistance, mechanical strength and environmental protection performance, so they are widely used in construction, vehicles, roof insulation materials, sports equipment, wind energy and other fields. During the production and processing of PET foam sheets, it is necessary to sample and conduct mechanical property tests in terms of tension, compression, shear, etc.

[0003] During the shear force test, PET special adhesive glue is usually applied on the front and back sides of the PET foam sheet, and two special metal plates for testing are clamped on the front and back sides of the PET foam sheet respectively, and then two F clamps are used to clamp it manually. After the glue is completely dry, the positioning ends of the two special metal plates for testing are fixed on the universal stretching machine for testing. Although the F clamp is simple and easy to operate, it is impossible to ensure that the clamping force of each F clamp is the same during the clamping operation, and it is also impossible to ensure that the clamping force of each F clamp is the same, which makes the bonding between the PET foam sheet and the special metal plate for testing uneven, resulting in great volatility in the test data; at the same time, torque will be generated during the locking process of the F clamp, which will cause relative displacement and skew between the PET foam sheet and the special metal plate for testing, and will also affect the test data. In addition, the travel of the F clamp is limited, and it can only clamp one set of PET foam sheet and special metal plate for testing at a time, which is time-consuming, labor-intensive and inefficient. Utility Model Content

[0004] The utility model aims to provide a fixture for shearing test of PET foam board, so as to solve the problems of large error in shearing force test result of existing PET foam board and low detection efficiency.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a clamp for shearing test of PET foam board, including a base, one end of the base is provided with a left fixed vertical plate, and the other end is provided with a right fixed vertical plate, a group of support rods and a clamping plate that moves back and forth are provided between the left fixed vertical plate and the right fixed vertical plate, and the right fixed vertical plate is also provided with a locking device for driving the clamping plate to move toward the left fixed vertical plate and lock it.

[0006] Specifically, the locking device includes a locking screw, and the right fixed vertical plate is provided with a locking screw hole matched with the locking screw; one end of the locking screw is also provided with a rotating handle.

[0007] In order to collect the excess glue squeezed out due to the force, a glue collecting groove is arranged on the base.

[0008] Preferably, the longitudinal cross-section of the support rod is a diamond-shaped structure with the vertex facing upward.

[0009] For the convenience of operation, a group of guide holes adapted to the support rods are arranged on the clamping plate, and the support rods are inserted into the guide holes.

[0010] In order to facilitate the control of the clamping force, a pressure sensor is arranged on the side of the left fixed vertical plate facing the clamping plate, and the pressure sensor is connected to a pressure display.

[0011] To facilitate movement, handles are provided on the left fixed vertical plate and the right fixed vertical plate.

[0012] To facilitate recycling of the glue in the glue collecting trough, the bottom of the glue collecting trough is a V-shaped structure with a low middle and high sides. A glue discharge outlet is also provided on the side wall of the glue collecting trough, and the glue discharge outlet is arranged close to the bottom of the V-shaped structure.

[0013] The beneficial effects of the utility model are as follows: the utility model drives the clamping plate to act on the component to be tested through the locking device, which can ensure that the force between each special metal plate for detection and the PET foam plate is uniform, so that the glue is evenly distributed between the two, so that each area is subjected to the same bonding force, and the pressure sensor can also be used to accurately control the clamping force of each batch of components to be tested to be the same. The above structure can ensure the uniformity of the components to be tested, thereby ensuring the accuracy and reliability of the test data. At the same time, the utility model can clamp multiple groups of components to be tested at one time, saving time and effort and improving work efficiency. In addition, by placing the component to be tested on the edge of the support rod with the top facing upward, the excess glue drips into the glue collection groove along the diamond-shaped slope, which is conducive to discharging the excess glue downward; and, through the cooperation of the V-shaped structure bottom of the glue collection groove and the glue discharge port, it is convenient to recycle and reuse the glue, avoid wasting glue, and thus save costs.

[0014] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the utility model.

[0016] Figure 2 It is a top view of the utility model.

[0017] Figure 3 It is the front view of the utility model.

[0018] Figure 4 It is a cross-sectional view of the bottom of the V-shaped structure of the glue collecting groove in the utility model.

[0019] Figure 5 It is a left side view of the splint in the utility model.

[0020] Figure 6 This is a usage state diagram of the utility model.

[0021] Figure 7 This is a schematic diagram after the special metal plate for testing is bonded to the PET foam board. DETAILED DESCRIPTION

[0022] Examples, such as Figure 1-7 As shown, a fixture for shear test of PET foam sheet comprises a base 1, a left fixed vertical plate 2 arranged at one end of the base 1, and a right fixed vertical plate 3 arranged at the other end of the base 1, and two support rods 7 and a clamping plate 4 that moves back and forth are arranged between the left fixed vertical plate 2 and the right fixed vertical plate 3. In actual operation, firstly, the front and back sides of the PET foam sheet 102 are coated with PET special adhesive glue, and then two special metal plates 101 for testing are clamped on the front and back sides of the PET foam sheet 102, and then placed horizontally on the support rod 7. The above two special metal plates 101 for testing and the PET foam sheet 102 sandwiched in the middle constitute a group of components to be tested, and multiple groups of components to be tested can be placed on the support rod 7 at one time and clamped together.

[0023] In order to facilitate the clamping of the component to be tested, the support rod 7 is provided with a clamping plate 4 that can move back and forth for clamping the component to be tested. In order to ensure that the clamping plate 4 maintains horizontal movement, the clamping plate 4 is provided with a group of guide holes 41 that are adapted to the support rod 7, and the support rod 7 is inserted into the guide holes 41. The right fixed vertical plate 3 is provided with a locking device 5 for pushing the clamping plate 4 to move toward the left fixed vertical plate 2 and locking it. The locking device 5 includes a locking screw 51, and the right fixed vertical plate 3 is provided with a locking screw hole 31 that is adapted to the locking screw 51, and one end of the locking screw 51 is also provided with a rotating handle 52. During actual operation, the handle 52 is rotated clockwise to drive the locking screw 51 to move toward the clamp plate 4, and the end of the locking screw 51 acts on the clamp plate 4, thereby driving the clamp plate 4 to clamp the component to be tested on the support rod 7. After the glue is dried, the handle 52 is rotated counterclockwise to loosen the clamp plate 4, and then the component to be tested is removed and installed on the shear force testing machine for testing.

[0024] In order to accurately control the clamping force and ensure the reliability of the test data, a pressure sensor 8 is provided on the side of the left fixed vertical plate 2 facing the clamping plate 4, and the pressure sensor 8 is connected to a pressure display 81. The pressure sensor 8 and the pressure display 81 cooperate to ensure that the clamping force is the same each time.

[0025] In order to collect the excess glue squeezed out by force, the base 1 is provided with a glue collecting groove 11, through which the excess glue squeezed out by pressure can be collected. In order to recycle the glue in the glue collecting groove 11, the bottom of the glue collecting groove 11 is a V-shaped structure with a low middle and high sides, and a glue outlet 111 is also provided on the side wall of the glue collecting groove 11. The glue outlet 111 is arranged near the bottom of the V-shaped structure, and the glue can be discharged through the glue outlet 111 for reuse to avoid waste.

[0026] In order to prevent the excess glue squeezed out by pressure from condensing on the support rod 7, the longitudinal section of the support rod 7 is a diamond structure with the vertex facing upward, and the excess glue can flow down along the slope of the diamond into the glue collecting groove 11. It should be noted that the longitudinal section of the support rod 7 can also be a circle, or a triangle with the vertex facing upward, etc., not limited to the diamond structure with the vertex facing upward, and examples are not given here one by one.

[0027] In order to facilitate movement, handles 9 are provided on the left fixed vertical plate 2 and the right fixed vertical plate 3 .

[0028] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A fixture for shear testing of PET foam sheets, characterized in that: The invention comprises a base (1), one end of the base (1) is provided with a left fixed vertical plate (2), and the other end is provided with a right fixed vertical plate (3), a group of support rods (7) and a clamping plate (4) that moves back and forth are provided between the left fixed vertical plate (2) and the right fixed vertical plate (3), and a locking device (5) for driving the clamping plate (4) to move in the direction of the left fixed vertical plate (2) and lock it is also provided on the right fixed vertical plate (3).

2. The PET foam sheet shear test fixture as claimed in claim 1, characterized in that: The locking device (5) comprises a locking screw (51), and a locking screw hole (31) matching the locking screw (51) is provided on the right fixed vertical plate (3); a rotating handle (52) is also provided at one end of the locking screw (51).

3. The PET foam sheet shear test fixture as claimed in claim 1, characterized in that: The base (1) is provided with a glue collecting groove (11).

4. The PET foam sheet shear test fixture as claimed in claim 1, characterized in that: The longitudinal cross section of the support rod (7) is a diamond-shaped structure with the apex facing upwards.

5. The PET foam board shear test fixture as claimed in claim 1, characterized in that: The clamping plate (4) is provided with a group of guide holes (41) adapted to the support rod (7), and the support rod (7) is sleeved in the guide holes (41).

6. The PET foam board shear test fixture as claimed in claim 1, characterized in that: A pressure sensor (8) is provided on the side of the left fixed vertical plate (2) facing the clamping plate (4), and the pressure sensor (8) is connected to a pressure display (81).

7. The PET foam board shear test fixture as claimed in claim 1, characterized in that: The left fixed vertical plate (2) and the right fixed vertical plate (3) are both provided with handles (9).

8. The PET foam board shear test fixture as claimed in claim 3, characterized in that: The bottom of the glue collecting groove (11) is a V-shaped structure with a lower middle and higher sides. A glue discharge outlet (111) is also provided on the side wall of the glue collecting groove (11), and the glue discharge outlet (111) is arranged close to the bottom of the V-shaped structure.

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