Plastic product stretching measuring device

Abstract

The utility model discloses a plastic product stretching measurement device, and belongs to the field of plastic product detection equipment. The device comprises a main machine, the main machine is provided with a machine frame, the machine frame is provided with a driving device, and the clamping assembly comprises a mounting rod connected with the driving device; the upper clamping head is arranged on the bottom side of the mounting rod, is provided with a first clamping area and is of an arc-shaped structure; the first clamping block is arranged in the first clamping area; the lower chuck and the upper chuck are oppositely arranged on the rack, a second clamping area is arranged on the lower chuck, and the lower chuck is of an arc-shaped structure; the second clamping block is arranged in the second clamping area; the first clamping area and the second clamping area are symmetrically arranged with the horizontal center line of the vertical distance as the axis. And a gap is formed between the first clamping block and the upper chuck as well as between the second clamping block and the lower chuck. The two ends of the test piece are placed along the arc of the first clamping area and the arc of the second clamping area respectively, then the test piece is clamped and fixed through the first clamping block and the second clamping block, and the problem that in the stretching operation, the test piece falls off due to infirm clamping of the clamping head, and testing is stopped is solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of tensile testing equipment for plastic products, and specifically relates to a tensile testing device for plastic products. Background Technology

[0002] Tensile testing of cable insulation sleeves is mainly used to evaluate the mechanical properties of the product, reflecting its ability to withstand external tensile forces and its deformation characteristics.

[0003] The national recommended standard "General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 11: General Test Methods - Thickness and Dimensional Measurement - Mechanical Properties Test" (GB / T 2951.11-2008) clearly specifies the treatment of dumbbell specimens: "Before the tensile test, mark two lines in the center of each dumbbell specimen. The distance between them is 20mm for large dumbbell specimens and 10mm for small dumbbell specimens." In other words, before the tensile test, mark lines on the dumbbell specimens, with a spacing of 20mm or 10mm between the two lines.

[0004] Before performing tensile measurements, both ends of the dumbbell specimen need to be fixed to the clamps. However, the existing tensile measuring devices use clamps to tightly fix the specimen, and their size is relatively large, resulting in a significant portion of the specimen's ends being inside the clamps. When measuring small bell specimens, after the two ends are fixed, the spacing between the marking lines may be less than 10mm, leading to inaccurate measurements.

[0005] For example, Chinese patent document CN211292357U discloses a dual-mode plastic tensile testing machine, including lead screws, a motor, a support frame, an upper crossbeam, and a lower crossbeam. The support frame is a frame structure, with two lead screws symmetrically fixed on the left and right sides. Upper and lower support beams are mounted between the two lead screws via upper and lower pairs of sliders. A pair of tension clamps are installed between the top of the support frame and the upper support beam, and a pair of bending clamps are installed between the lower support beam and the bottom of the support frame. The tops of the two lead screws are each connected to a motor output shaft via a coupling, and the two motor output shafts are connected to a drive motor, which is mounted on the top of the support frame. This invention avoids the time spent changing clamps, reduces investment costs, and greatly improves work efficiency.

[0006] The technical solution in this patent document uses upper and lower jaws to clamp the specimen during tensile testing. The specimen is clamped vertically, which can lead to problems such as insecure clamping and the specimen falling off under force, affecting the measurement. Moreover, as shown in the attached drawings, a large portion of both ends of the specimen is still clamped by the upper and lower jaws during clamping. As a result, this tensile testing machine is not suitable for tensile testing of small bell parts. Utility Model Content

[0007] This invention provides a tensile measuring device for plastic products to solve the above-mentioned technical problems.

[0008] To solve the above technical problems, the present invention adopts the following technical solution:

[0009] A tensile testing device for plastic products includes a main unit with a frame and a drive unit mounted on the frame. It also includes a clamping assembly comprising: a mounting rod connected to the drive unit; an upper clamp on the bottom side of the mounting rod, having a first clamping area with an arc-shaped structure; a first clamping block within the first clamping area; a lower clamp on the frame opposite to the upper clamp, having a second clamping area with an arc-shaped structure; and a second clamping block within the second clamping area. The first and second clamping areas are symmetrically arranged about a horizontal midline of their vertical distance. There is a gap between the first clamping block and the upper clamp, and a gap between the second clamping block and the lower clamp.

[0010] Furthermore, the first clamping block is movably connected to the first clamping area, and the second clamping block is movably connected to the second clamping area.

[0011] Furthermore, the outer sides of the first clamping block and the second clamping block are provided with raised textures.

[0012] Furthermore, the clamping assembly further includes: a first clamping member, which is threaded onto the upper clamp and the lower clamp respectively; the first clamping member can rotate to abut against the first clamping block and the second clamping block respectively and move inward.

[0013] Furthermore, the clamping assembly further includes: a third clamping area, which is an arc-shaped structure and is disposed on the side of the first clamping area; a third clamping block disposed within the third clamping area; a fourth clamping area, which is an arc-shaped structure and is disposed on the side of the second clamping area; a fourth clamping block disposed within the second clamping area; the third clamping area and the first clamping area are located on opposite sides of the vertical center line of the upper clamp; the fourth clamping area and the second clamping area are located on opposite sides of the vertical center line of the lower clamp.

[0014] Furthermore, the third clamping area and the fourth clamping area are arranged symmetrically about the horizontal midline of their vertical distance, and the height of both is less than the height of the first clamping area.

[0015] Furthermore, the clamping assembly further includes: a second clamping member, which is threaded onto the upper clamp and the lower clamp respectively; the second clamping member can rotate to abut against the third clamping block and the fourth clamping block to move inward respectively.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The first clamping area and the second clamping area are arc-shaped structures, which can place the two ends of the specimen to be stretched along the arc, and then clamp it with the first clamping block and the second clamping block to achieve clamping and fixing of the specimen to be stretched; the raised grooves on the outside of the first clamping block and the second clamping block can prevent the specimen from falling off during the stretching operation and affecting the normal measurement operation.

[0018] 2. The first clamping component can push the first clamping block and the second clamping block inward to further clamp and fix the specimen, ensuring that the measurement can be carried out smoothly.

[0019] 3. Due to the different specifications and dimensions of different specimens, a third and fourth clamping zone smaller than the first clamping zone are set up to ensure a firm clamping. In use, the specimen to be stretched is placed along the arc of the third and fourth clamping zones. Then, by rotating the second clamping member, the third and fourth clamping blocks are moved inward, thereby clamping the specimen and fixing it in place. In this way, the tensile measurement requirements of specimens of different specifications can be met. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the upper clamp structure of this utility model.

[0023] Figure 3 This is a schematic diagram of the lower clamp structure of this utility model.

[0024] Reference numerals: 1-Main unit, 11-Frame, 2-Drive device, 3-Clamping assembly, 31-Mounting rod, 32-Upper chuck, 321-First clamping area, 322-Third clamping area, 323-First clamping bar, 33-First clamping block, 34-Lower chuck, 341-Second clamping area, 342-Fourth clamping area, 343-Second clamping bar, 35-Second clamping block, 36-First clamping element, 37-Third clamping block, 38-Fourth clamping block, 39-Second clamping element. Detailed Implementation

[0025] To facilitate a better understanding of this utility model, the following examples are provided in conjunction with the accompanying drawings. These examples fall within the protection scope of this utility model, but do not limit the protection scope of this utility model.

[0026] Example 1

[0027] A tensile measuring device for plastic products, such as Figures 1-3 As shown, the device includes a main unit 1, which has a frame 11. The frame 11 has a drive device 2. The device also includes a clamping assembly 3, which includes a mounting rod 31 connected to the drive device 2; an upper clamp 32 located on the bottom side of the mounting rod 31, which has a first clamping area 321 with an arc-shaped structure; a first clamping block 33 located within the first clamping area 321; a lower clamp 34 located opposite the upper clamp 32 on the frame 11, which has a second clamping area 341 with an arc-shaped structure; and a second clamping block 35 located within the second clamping area 341. The first clamping area 321 and the second clamping area 341 are symmetrically arranged about the horizontal midline of their vertical distance. There is a gap between the first clamping block 33 and the upper clamp 32, and there is a gap between the second clamping block 35 and the lower clamp 34.

[0028] like Figures 1-3 As shown, the first clamping block 33 is movably connected to the first clamping area 321, and the second clamping block 35 is movably connected to the second clamping area 341.

[0029] like Figures 1-3 As shown, the outer sides of the first clamping block 33 and the second clamping block 35 are provided with raised texture.

[0030] like Figures 1-3 As shown, the clamping assembly 3 also includes: a first clamping member 36, which is threaded onto the upper chuck 32 and the lower chuck 34 respectively; the first clamping member 36 can rotate to abut against the first clamping block 33 and the second clamping block 35 respectively and move inward.

[0031] The drive device can be any existing equipment such as hydraulic or pneumatic systems, preferably one that can smoothly control the raising or lowering of the mounting rod during measurement.

[0032] A slide groove can be opened on the inside of the frame so that both ends of the mounting rod can extend into the slide groove. When driven by the drive device, the lifting operation can be achieved smoothly, avoiding unevenness of the mounting rod that would affect the accuracy of the measurement data.

[0033] The upper and lower clamps are used to clamp the two ends of the specimen, respectively. The conventional clamping method is vertical, that is, the upper and lower ends of the specimen are in the same vertical plane. In order to prevent the specimen from falling off when the upper clamp moves upward under force, the structure of the clamps has been improved.

[0034] The first clamping block can move in the first clamping area, and the second clamping block can move in the second clamping area. They can be limited by existing structures such as slots, so that the first clamping block and the second clamping block are respectively located in the first clamping area and the second clamping area. There are two first clamping members, which are used in conjunction with the first clamping block and the second clamping block respectively. The two first clamping members are threadedly connected to the upper chuck and the lower chuck respectively. When in use, the first clamping members can be rotated so that they abut against the first clamping block and the second clamping block and move inward, thereby clamping and fixing the specimen with both ends placed in the first clamping area and the second clamping area respectively.

[0035] Instructions for use: Adjust the upper clamp to the appropriate position using the control drive device according to the size of the specimen to be measured; slightly loosen the first clamping member so that the two ends of the specimen can be placed along the arc of the first clamping area and the second clamping area respectively, and then tighten the first clamping member, so that the first clamping block and the second clamping block move inward under force, thereby clamping and fixing the two ends of the specimen to the upper clamp and the lower clamp respectively; start the main unit to perform the measurement operation and record the readings; after the measurement is completed, loosen the first clamping member again and remove the broken specimen from the upper clamp and the lower clamp respectively; repeat the above operation to perform the measurement operation on the next specimen.

[0036] Example 2

[0037] Compared with Example 1, this tensile measuring device also has the following technical features:

[0038] like Figures 1-3 As shown, the clamping assembly 3 further includes: a third clamping area 322, which is an arc-shaped structure and is located on the side of the first clamping area 321; a third clamping block 37, which is located within the third clamping area 322; a fourth clamping area 342, which is an arc-shaped structure and is located on the side of the second clamping area 341; and a fourth clamping block 38, which is located within the fourth clamping area 342; the third clamping area 322 and the first clamping area 321 are located on opposite sides of the vertical center line of the upper clamp 32; and the fourth clamping area 342 and the second clamping area 341 are located on opposite sides of the vertical center line of the lower clamp 34.

[0039] like Figures 1-3 As shown, the third clamping area 322 and the fourth clamping area 342 are symmetrically arranged with the horizontal midline of their vertical distance as the axis, and the height of both is less than the height of the first clamping area 321.

[0040] like Figures 1-3 As shown, the clamping assembly 3 also includes: a second clamping member 39, which is threaded onto the upper clamp 32 and the lower clamp 34 respectively; the second clamping member 39 can rotate to abut against the third clamping block 37 and the fourth clamping block 38 respectively and move inward.

[0041] Since different specimens vary in size, a third clamping zone and a fourth clamping zone are respectively set on the upper and lower clamps to meet the measurement needs of different specimens. The third clamping block can move in the third clamping zone, and the fourth clamping block can move in the fourth clamping zone. They can be limited by existing structures such as slots to ensure that the third and fourth clamping blocks are located in the third and fourth clamping zones respectively. In use, first adjust the upper clamp to the appropriate position, then place the two ends of the appropriate specimen along the arc of the third and fourth clamping zones respectively, and then tighten the second clamping piece to press the third and fourth clamping blocks inward, thereby fixing the two ends of the specimen to the clamps respectively. Then start the main unit to perform tensile measurement and record the data. After the measurement is completed, loosen the second clamping pieces corresponding to the upper and lower clamps respectively, and remove the broken specimen.

[0042] First clamping strips 323 can be provided on both sides of the first clamping area of ​​the upper clamp and the second clamping area of ​​the lower clamp, and second clamping strips 433 can be provided on both sides of the third clamping area of ​​the upper clamp and the fourth clamping area of ​​the lower clamp. The first and second clamping strips are convex structures with elasticity, which can further clamp and fix the specimen. Raised lines can be provided on the first and second clamping strips.

[0043] The innovation of this application lies in components such as the host and drive unit, and the specific models are not described here.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for measuring the tensile properties of plastic articles, comprising a main unit (1) provided with a frame (11) on which a drive device (2) is arranged, characterized in that, Also includes: Clamping assembly (3) includes: Mounting rod (31) is connected to the drive device (2); The upper clamp (32) is located on the bottom side of the mounting rod (31), and a first clamping area (321) is provided on it, which is an arc-shaped structure; The first clamping block (33) is located within the first clamping area (321); The lower chuck (34) is disposed on the frame (11) opposite to the upper chuck (32), and has a second clamping area (341) on it, which is an arc-shaped structure; The second clamping block (35) is located within the second clamping area (341); The first clamping area (321) and the second clamping area (341) are arranged symmetrically about the horizontal midline of their vertical distance; There is a gap between the first clamping block (33) and the upper clamp (32), and there is a gap between the second clamping block (35) and the lower clamp (34).

2. A device for measuring the tensile properties of a plastic article according to claim 1, wherein The first clamping block (33) is movably connected to the first clamping area (321), and the second clamping block (35) is movably connected to the second clamping area (341).

3. A device for measuring the tensile properties of a plastic article according to claim 2, wherein The outer sides of the first clamping block (33) and the second clamping block (35) are provided with raised texture.

4. A device for measuring the tensile properties of a plastic article according to claim 3, wherein The clamping assembly (3) further includes: The first clamping member (36) is threaded onto the upper clamp (32) and the lower clamp (34), respectively; The first clamping member (36) can rotate to abut against the first clamping block (33) and the second clamping block (35) respectively and move inward.

5. A device for measuring the tensile properties of a plastic article according to any one of claims 1 to 4, wherein The clamping assembly (3) further includes: The third clamping area (322) is an arc-shaped structure and is located on the side of the first clamping area (321); The third clamping block (37) is located within the third clamping area (322); The fourth clamping area (342) is an arc-shaped structure and is located on the side of the second clamping area (341); The fourth clamping block (38) is located within the fourth clamping area (342); The third clamping area (322) and the first clamping area (321) are located on opposite sides of the vertical center line of the upper clamp (32); The fourth clamping area (342) and the second clamping area (341) are located on opposite sides of the vertical center line of the lower clamp (34).

6. A device for measuring the tensile properties of a plastic article according to claim 5, wherein The third clamping area (322) and the fourth clamping area (342) are symmetrically arranged with the horizontal midline of their vertical distance as the axis, and the height of both is less than the height of the first clamping area (321).

7. A device for measuring the tensile properties of a plastic article according to claim 6, wherein The clamping assembly (3) further includes: The second clamping member (39) is threaded onto the upper clamp (32) and the lower clamp (34), respectively; The second clamping member (39) can rotate to abut against the third clamping block (37) and the fourth clamping block (38) respectively and move inward.

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