Device for accurate sample preparation of dumbbell test piece

Abstract

The utility model provides an accurate sample preparation device for a dumbbell test piece. The accurate sample preparation device comprises a cutter and a flattening device, the flattening device is located in the cut-off knife and comprises a lower plate, a guide rod, a pressing spring, an upper plate and a pressing plate. The lower plate is located at the lowermost portion of the flattening device, the guide rods are located on the upper surface of the lower plate, the compression springs are located on the peripheries of the guide rods and distributed around the guide rods, the upper plate is located on the upper portions of the guide rods, and the pressing plate is located above the upper plate and matched with the guide rods. According to the accurate sample preparation device for the dumbbell test piece, the lower plate is used for flattening a cut material, when the pressing plate is stressed and pressed downwards, the cutter is pressed downwards, at the moment, the area of the pressing plate is larger than that of the cutter, it can be guaranteed that the cutter is stressed evenly, then the upper plate tightly presses the lower plate on the surface of the material through the compression spring, and the sample is accurately prepared. Therefore, the situation that the material protrudes due to deformation in the cutting process, the size after cutting is affected is avoided, and when the elasticity of the material is different, springs with different elasticity can be replaced to achieve flattening.

Description

Technical Field

[0001] The utility model relates to a device for accurately preparing samples of dumbbell test pieces. Background Art

[0002] In order to determine the tensile stress-strain properties of vulcanized rubber or thermoplastic rubber, it is necessary to make a dumbbell specimen of vulcanized rubber or thermoplastic rubber, and then measure the tensile properties of the material by mechanical stretching. During the test, the accuracy of the cross-sectional dimensions of the smallest width of the dumbbell specimen has a direct impact on the test results. The traditional dumbbell sample preparation equipment is to place the dumbbell-shaped blade of the dumbbell sample cutting knife on the material plane, and the sample preparation equipment applies pressure to the back of the cutter, and the blade is pressed into the material to intercept the dumbbell-shaped specimen. Because the materials have different elasticities, during the preparation of the specimen, the elastic deformation of the material causes the material part within the blade circle to bulge upward, and the width of the narrowest part of the final specimen is wider than the width of the corresponding position of the cutter blade. The elasticity of the material is different, and the width of the narrowest part of the specimen made with the same cutter will be different, which will cause the material tensile test results to be more discrete. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a device for accurately preparing dumbbell specimens, aiming to use a flattening device to flatten the elastic material inside the cutter to prevent it from deforming after being subjected to force, and at the same time use the spring elastic force to balance the pressure on the material, which is easy to operate and improves the sample preparation accuracy.

[0004] In order to solve the above technical problems, the technical scheme of the utility model is: a device for accurate sample preparation of dumbbell specimens, comprising a cutting knife and a flattening device; the flattening device is located inside the cutting knife and conflicts with the cutting knife during sample preparation; the flattening device comprises a lower plate, a guide rod, a clamping spring, an upper plate and a clamping plate; the lower plate is located at the bottom of the flattening device and conflicts with the sample preparation material; the guide rod is located on the upper surface of the lower plate and is fixedly connected to the lower plate; the clamping spring is located at the periphery of the guide rod, distributed around the guide rod, and the two ends are respectively in conflict with the lower plate and the upper plate; the upper plate is located on the upper part of the guide rod and at the same time located above the clamping spring and conflicts with the clamping spring; the clamping plate is located above the upper plate and cooperates with the guide rod, and its area is larger than that of the cutting knife, so as to provide pressure for the cutting knife to perform cutting.

[0005] Furthermore, the shapes of the upper plate and the lower plate match the position of the cutter where the width is the smallest.

[0006] Furthermore, three guide rods are provided and evenly distributed between the upper plate and the lower plate.

[0007] Furthermore, the cutter is in the shape of a dumbbell and is hollow inside, and the flattening device is located inside the device.

[0008] Furthermore, the pressing plate and the upper plate are both provided with guide holes, and the guide holes cooperate with the guide rods to facilitate the movement of the pressing plate and the upper plate along the guide rods.

[0009] Furthermore, the compression spring is a replaceable spring, both ends of which are in contact with the upper plate and the lower plate without being connected, and can be replaced according to the different elasticities of the cutting material.

[0010] Compared with the prior art, the utility model provides a device for accurate sample preparation of dumbbell specimens, which uses a lower plate to flatten the cut material. When the pressure plate is pressed downward, the cutter is pressed downward. At this time, the area of ​​the pressure plate is larger than the cutter to ensure that the cutter is evenly stressed. Then the upper plate presses the lower plate against the surface of the material through a compression spring, thereby preventing the material from bulging due to deformation during cutting and affecting the size after cutting. When the elasticity of the material is different, springs with different elastic forces can be replaced to achieve flattening. The entire device has a simple structure, is easy to operate, and is low in cost, and can be widely promoted and used. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The main sectional view of the utility model is shown.

[0012] Figure 2 Shown is a top view of the utility model after the pressure plate is removed.

[0013] Among them: 1. cutting knife, 2. flattening device, 3. lower plate, 4. guide rod, 5. clamping spring, 6. upper plate, 7. pressure plate, 8. guide hole. DETAILED DESCRIPTION

[0014] As shown in the figure, a device for accurate sample preparation of dumbbell specimens comprises a cutter 1 and a flattening device 2; the flattening device 2 is located inside the cutter 1 and conflicts with the cutter 1 during sample preparation; the flattening device 2 comprises a lower plate 3, a guide rod 4, a compression spring 5, an upper plate 6 and a compression plate 7; the lower plate 3 is located at the bottom of the flattening device 2 and conflicts with the sample preparation material; the guide rod 4 is located on the upper surface of the lower plate 3 and is fixedly connected to the lower plate 3; the compression spring 5 is located at the periphery of the guide rod 4, distributed around the guide rod 4, and the two ends conflict with the lower plate 3 and the upper plate 6 respectively; the upper plate 6 is located on the upper part of the guide rod 4 and at the same time located above the compression spring 5 and conflicts with the compression spring 5; the compression plate 7 is located above the upper plate 6 and cooperates with the guide rod 4, and its area is larger than that of the cutter 1, so as to provide pressure for the cutter 1 to perform cutting.

[0015] Furthermore, the shapes of the upper plate 6 and the lower plate 3 match the position of the cutter 1 where the width is the smallest.

[0016] Furthermore, three guide rods 4 are provided and evenly distributed between the upper plate 6 and the lower plate 3 .

[0017] Furthermore, the cutter 1 is in the shape of a dumbbell, which is hollow inside, and the flattening device 2 is located inside the device.

[0018] Furthermore, the pressing plate 7 and the upper plate 6 are both provided with guide holes 8 , and the guide holes 8 cooperate with the guide rods 4 to facilitate the movement of the pressing plate 7 and the upper plate 6 along the guide rods 4 .

[0019] Furthermore, the compression spring 5 is a replaceable spring, both ends of which are in contact with the upper plate 6 and the lower plate 3 without being connected, and can be replaced according to the elasticity of the cutting material.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than a restrictive technical solution. Ordinary technicians in this field should understand that those modifications or equivalent replacements of the technical solution of the utility model without departing from the purpose and scope of the technical solution should be included in the scope of the claims of the utility model.

Claims

1. A device for accurately preparing dumbbell specimens, characterized in that: It includes a cutting knife and a flattening device; the flattening device is located inside the cutting knife and conflicts with the cutting knife during sample making; the flattening device includes a lower plate, a guide rod, a clamping spring, an upper plate and a clamping plate; the lower plate is located at the bottom of the flattening device and conflicts with the sample making material; the guide rod is located on the upper surface of the lower plate and is fixedly connected to the lower plate; the clamping spring is located at the periphery of the guide rod, distributed around the guide rod, and the two ends are respectively in conflict with the lower plate and the upper plate; the upper plate is located on the upper part of the guide rod and at the same time located above the clamping spring and conflicts with the clamping spring; the clamping plate is located above the upper plate and cooperates with the guide rod, and its area is larger than that of the cutting knife, so as to provide pressure for the cutting knife to perform cutting.

2. The device for accurate sample preparation of dumbbell specimens according to claim 1, characterized in that: The shapes of the upper plate and the lower plate match the position of the cutter where the width is the smallest.

3. The device for accurate sample preparation of dumbbell specimens according to claim 1, characterized in that: There are three guide rods, which are evenly distributed between the upper plate and the lower plate.

4. The device for accurate sample preparation of dumbbell specimens according to claim 1, characterized in that: The cutter is in the shape of a dumbbell and is hollow inside, and the flattening device is located inside the cutter.

5. The device for accurate sample preparation of dumbbell specimens according to claim 1, characterized in that: The pressing plate and the upper plate are both provided with guide holes, and the guide holes cooperate with the guide rods to facilitate the movement of the pressing plate and the upper plate along the guide rods.

6. The device for accurate sample preparation of dumbbell specimens according to claim 1, characterized in that: The compression spring is a replaceable spring, both ends of which are in contact with the upper plate and the lower plate without being connected, and can be replaced according to the different elasticities of the cutting material.

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