Plastic product surface hardness detection device

Abstract

The utility model discloses a plastic product surface hardness detection device which comprises a base, a telescopic cavity is formed in the base, a supporting column is installed in the telescopic cavity, a limiting block is fixedly installed below the supporting column, a piston is installed below the limiting block, a reset spring is installed below the piston, and the reset spring is connected with the telescopic cavity. A pipeline is installed below the telescopic cavity, and an electric control valve is installed below the pipeline. The support is installed above the base, an electric push rod is installed above the support, and a CUI measuring probe is installed at the output end of the electric push rod. According to the plastic product surface hardness detection device, a plurality of supporting columns capable of stretching up and down are arranged, so that a groove matched with a plastic product in shape is conveniently formed in the supporting columns, the plastic product is conveniently limited in the groove, and limitation and hardness detection on the plastic products with different shapes and sizes are facilitated; the detection efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of surface hardness testing technology for plastic products, specifically a device for testing the surface hardness of plastic products. Background Technology

[0002] Plastic products are a general term for household and industrial goods made primarily from plastics. This includes products manufactured using processes such as injection molding and thermoforming. Plastics are a type of synthetic polymer material with plasticity. The production of plastic products requires testing their surface hardness to understand the material's deformation capacity under certain conditions. This is crucial for assessing the material's lifespan and its tensile, compressive, and flexural properties. Hardness testing equipment is indispensable for testing the surface hardness of plastic products.

[0003] Chinese Patent Publication No. CN220794926U discloses a surface hardness testing device for engineering plastic products, including a testing machine base and a testing frame. The testing frame is fixedly mounted on both sides above the testing machine base. A first leverless cylinder is installed at the upper end of the testing frame, and a drive slider is mounted on the surface of the first leverless cylinder. A second leverless cylinder is installed between the drive sliders, and a fixed slide column is provided on the second leverless cylinder. A sliding block is mounted on the surface of the fixed slide column. A hardness sensor and a hardness data display screen are respectively installed at the front end of the sliding block. The hardness sensor and the hardness data display screen are electrically connected. This utility model, by providing a convenient moving adjustment and positioning device, facilitates the omnidirectional horizontal movement of the hardness sensor, enabling comprehensive hardness testing of engineering plastic products on the testing machine base, and timely display of relevant test hardness values ​​on the hardness data display screen.

[0004] Since plastic products vary in shape and size, and the aforementioned surface hardness testing devices lack a restraining structure for plastic products, the plastic products are prone to movement during testing, affecting the testing effect and efficiency. Therefore, we propose a surface hardness testing device for plastic products. Utility Model Content

[0005] The purpose of this invention is to provide a surface hardness testing device for plastic products, in order to solve the problem mentioned in the background art that, due to the different shapes and sizes of plastic products, the surface hardness testing device lacks a restraining structure for the plastic products, which leads to the plastic products easily moving during testing, affecting the testing effect and efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a surface hardness testing device for plastic products, comprising a base, an internal telescopic cavity, a support column installed inside the telescopic cavity, a limit block fixedly installed below the support column, a piston installed below the limit block, a return spring installed below the piston, a pipe installed below the telescopic cavity, and an electrically controlled valve installed below the pipe.

[0007] Preferably, the telescopic cavities are evenly distributed along the interior of the base.

[0008] Preferably, the shape and size of the limiting block partially match the shape and size of the inside of the telescopic cavity, and the limiting block moves inside the telescopic cavity.

[0009] Preferably, the shape and size of the piston match the shape and size of the interior of the telescopic cavity, and the piston and the telescopic cavity are in close contact.

[0010] Preferably, the support column is elastically connected to the telescopic cavity via a return spring, and the support column can move inside the telescopic cavity.

[0011] Preferably, the electrically controlled valve is connected to the telescopic cavity via a pipeline.

[0012] Preferably, the base further comprises:

[0013] A bracket is mounted above the base. An electric push rod is mounted above the bracket. A CUI measurement probe is mounted at the output end of the electric push rod. A diamond indenter is mounted below the CUI measurement probe. A laser module is installed inside the diamond indenter. A PDA terminal is mounted at the front end of the bracket. The CUI measurement probe is electrically connected to the PDA terminal.

[0014] Compared with the prior art, the present invention provides a surface hardness testing device for plastic products, which has the following beneficial effects: the surface hardness testing device for plastic products is provided with several vertically extendable support columns, so as to form a groove in the support columns that matches the shape of the plastic product, so as to restrict the plastic product inside the groove, which facilitates the restriction and hardness testing of plastic products of different shapes and sizes, and improves the testing efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the base of this utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of the diamond indenter of this utility model.

[0018] In the diagram: 1. Base; 2. Support column; 3. CUI measurement probe; 4. PDA terminal; 5. Electric push rod; 6. Bracket; 7. Diamond indenter; 8. Limit block; 9. Telescopic cavity; 10. Pipe; 11. Electrically controlled valve; 12. Piston; 13. Return spring; 14. Laser module. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-3 A surface hardness testing device for plastic products includes a base 1 with a telescopic cavity 9 inside. The telescopic cavities 9 are evenly distributed along the interior of the base 1. A support column 2 is installed inside the telescopic cavity 9, and a limit block 8 is fixedly installed below the support column 2. The shape and size of the limit block 8 partially match the shape and size of the interior of the telescopic cavity 9, and the limit block 8 can move inside the telescopic cavity 9. A piston 12 is installed below the limit block 8. The shape and size of the piston 12 match the shape and size of the interior of the telescopic cavity 9, and the piston 12 is in close contact with the telescopic cavity 9. A return spring 13 is installed below the piston 12. The support column 2 is elastically connected to the telescopic cavity 9 through the return spring 13, and the support column 2 can move inside the telescopic cavity 9. A pipe 10 is installed below the telescopic cavity 9. An electrically controlled valve 11 is installed below the pipe 10; the electrically controlled valve 11 is connected to the telescopic cavity 9 through the pipe 10; by setting several vertically retractable support columns 2, a groove matching the shape of the plastic product is formed in the support column 2, so as to restrict the plastic product inside the groove, which facilitates the restriction and hardness testing of plastic products of different shapes and sizes, and improves the testing efficiency; a bracket 6 is installed above the base 1, an electric push rod 5 is installed above the bracket 6, a CUI measuring probe 3 is installed at the output end of the electric push rod 5, a diamond indenter 7 is installed below the CUI measuring probe 3, a laser module 14 is installed inside the diamond indenter 7, a PDA terminal 4 is installed at the front end of the bracket 6, and the CUI measuring probe 3 is electrically connected to the PDA terminal 4.

[0021] Working Principle: When using this plastic product surface hardness testing device, the plastic product to be tested is first placed on the support column 2. Then, the controller controls the laser module 14 to emit a laser to locate the testing point. The plastic product adjusts its position according to the laser. After adjustment, the plastic product is pressed down, causing it to compress part of the support column 2 into the telescopic cavity 9. During this process, some gas inside the telescopic cavity 9 is discharged through the pipe 10 and the electrically controlled valve 11, thus forming a groove that matches the plastic product among the many support columns 2. Next, the controller controls the electrically controlled valve 11 to close, creating a sealed environment inside the telescopic cavity 9, thereby fixing the support column 2 and maintaining the formed groove. Then, the controller controls the electric push rod 5 to push the CUI measuring probe 3 and the diamond indenter below it. 7. The device moves downward a certain distance to contact the surface of the plastic product. The ultrasonic hardness tester consists of a handheld PDA terminal 4 and a CUI measuring probe 3, which are connected by a cable. The diamond indenter 7 at the front end of the hardness tester contacts the plastic product. Under uniform contact pressure, the resonant frequency of the probe changes with the hardness. The hardness is measured by measuring the change in this frequency. The PDA terminal 4, the CUI measuring probe 3, and the diamond indenter 7 are all existing technologies and will not be described in detail here. Then, when it is necessary to test plastic products of different shapes and sizes, the controller controls the electric valve 11 to open. Under the elastic force of the return spring 13, the support column 2 is pushed upward to the original position. Finally, the same operation is repeated to create a matching groove. This is the working principle of the plastic product surface hardness testing device.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the surface hardness of plastic products, characterized in that, include A base (1) has a telescopic cavity (9) inside. A support column (2) is installed inside the telescopic cavity (9). A limit block (8) is fixedly installed below the support column (2). A piston (12) is installed below the limit block (8). A return spring (13) is installed below the piston (12). A pipe (10) is installed below the telescopic cavity (9). An electrically controlled valve (11) is installed below the pipe (10).

2. The surface hardness testing device for plastic products according to claim 1, characterized in that, The telescopic cavity (9) is evenly distributed along the interior of the base (1).

3. The surface hardness testing device for plastic products according to claim 1, characterized in that, The shape and size of the limiting block (8) are partially matched with the shape and size of the telescopic cavity (9), and the limiting block (8) can move inside the telescopic cavity (9).

4. The surface hardness testing device for plastic products according to claim 1, characterized in that, The shape and size of the piston (12) match the shape and size of the telescopic cavity (9), and the piston (12) fits tightly with the telescopic cavity (9).

5. The surface hardness testing device for plastic products according to claim 1, characterized in that, The support column (2) is elastically connected to the telescopic cavity (9) through a return spring (13), and the support column (2) can move inside the telescopic cavity (9).

6. The surface hardness testing device for plastic products according to claim 1, characterized in that, The electrically controlled valve (11) is connected to the telescopic cavity (9) through the pipe (10).

7. The surface hardness testing device for plastic products according to claim 1, characterized in that, The base (1) is also provided with: A bracket (6) is mounted above the base (1). An electric push rod (5) is mounted above the bracket (6). A CUI measurement probe (3) is mounted at the output end of the electric push rod (5). A diamond indenter (7) is mounted below the CUI measurement probe (3). A laser module (14) is installed inside the diamond indenter (7). A PDA terminal (4) is mounted at the front end of the bracket (6). The CUI measurement probe (3) is electrically connected to the PDA terminal (4).

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