A hardness tester for testing the quality of injection molded parts

Abstract

This utility model discloses a hardness tester for testing the quality of injection molded parts, relating to the field of injection molded part quality testing technology. The utility model includes a Shore hardness tester body, a placement frame for the testing area of ​​the Shore hardness tester body, a position adjustment mechanism between the placement frame and the Shore hardness tester body, a clamping mechanism on the surface of the placement frame, and several elastic support mechanisms in the testing area of ​​the placement frame. Each elastic support mechanism has a locking mechanism at its support end. This utility model allows the support ends of several elastic support mechanisms to adaptively rise and fall by pressing on a shaped injection molded part on the surface of the placement frame, conforming to the bottom of the shaped injection molded part. The clamping mechanism fixes the posture of the shaped injection molded part, and the locking mechanism solidifies the height of the support ends. This effectively disperses the testing pressure of the Shore hardness tester body, avoids uneven deformation caused by insufficient support at the bottom of the shaped injection molded part, ensures stable force in the testing area, and thus improves the accuracy of hardness test data for shaped injection molded parts.

Description

Technical Field

[0001] This utility model belongs to the field of injection molded part quality testing technology, and specifically relates to a hardness tester for injection molded part quality testing. Background Technology

[0002] Injection molded part quality testing is a quality control process that verifies whether injection molded products meet design requirements through a series of testing methods (such as dimensional measurement, visual inspection, mechanical property testing, etc.). Hardness testing is one of the core items, mainly used to evaluate the rigidity, wear resistance and consistency of plastic materials.

[0003] Measuring the indentation resistance of injection molded parts using a Shore or Rockwell hardness tester can quickly determine whether the material formulation and molding process (such as temperature and pressure) meet the standards, while also identifying potential defects (such as uneven plasticization, degradation, or filler distribution problems), ensuring product performance stability and batch pass rate.

[0004] According to the Chinese Patent Publication No. CN222070381U, a plastic Rockwell hardness tester with a positioning structure is disclosed. When fixing the workpiece for testing, the workpiece is placed on the surface of the testing table. The second motor drives the second lead screw to rotate, thereby moving the position of the second connecting rod. Moving the second connecting rod moves the first clamping plate, so that the two sets of first clamping plates clamp the two sides of the workpiece. Then, the third electric telescopic rod is extended to adjust the height of the positioning pressure plate, pressing the two sets of positioning pressure plates against the surface of the workpiece. The first motor drives the first lead screw to rotate, and rotating the first lead screw moves the position of the first connecting block, changing the workpiece testing point.

[0005] However, according to the above-mentioned device and existing technology, when testing irregularly shaped injection molded parts, since these parts typically have thin-walled structures, recesses, and protrusions, if the pressure is too high during Shore hardness testing, the local pressure applied by the pressure gauge to the protruding parts on the surface of the irregularly shaped injection molded part will exceed the bending strength of the material because there is no support at the bottom recess. This will cause plastic deformation or elastic bending in the protruding test area on the surface of the irregularly shaped injection molded part, ultimately resulting in distorted hardness test values ​​(such as readings that are too high) or damage to the irregularly shaped injection molded part. Utility Model Content

[0006] In view of the problem that the lack of support at the bottom recess of irregularly shaped injection molded parts in related technologies leads to plastic deformation of the surface of the irregularly shaped injection molded parts, this utility model proposes a hardness tester for testing the quality of injection molded parts, so as to overcome the above-mentioned technical problems existing in the existing related technologies.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0008] This utility model is a hardness tester for testing the quality of injection molded parts, including a Shore hardness tester body. The test area of ​​the Shore hardness tester body is provided with a placement frame. A position adjustment mechanism is provided between the placement frame and the Shore hardness tester body. A clamping mechanism is provided on the surface of the placement frame. The test area of ​​the placement frame is provided with several elastic support mechanisms. The support end of the elastic support mechanism is provided with a locking mechanism.

[0009] By placing the irregularly shaped injection molded part on the support ends of several elastic support mechanisms and pressing it downwards, the height of several support ends is adjusted by the elastic force of the elastic ends, so that several support ends are in contact with the bottom of the irregularly shaped injection molded part. The clamping mechanism is used to clamp and fix the irregularly shaped injection molded part on the elastic support mechanism, and the locking mechanism locks the support ends after adjustment.

[0010] Furthermore, the position adjustment mechanism includes a motor, which is fixedly connected to one side of the Shore hardness tester body. The output shaft of the motor is fixedly connected to a lead screw, which is rotatably connected inside the Shore hardness tester body. A vertical movement frame is threaded onto the surface of the lead screw.

[0011] Furthermore, a second motor is fixedly connected to one end of the vertical moving frame, and a second lead screw is fixedly connected to the output shaft of the second motor. The second lead screw is rotatably connected inside the vertical moving frame, and the surface of the second lead screw is threadedly connected to the bottom of the placement frame.

[0012] Furthermore, the clamping mechanism includes a bidirectional screw, which is rotatably connected to the surface of the placement frame. One end of the bidirectional screw is fixedly connected to a handle, and a clamping block is threadedly connected to the surface of the bidirectional screw.

[0013] Furthermore, the elastic support mechanism includes multiple support rods, all of which are slidably connected inside the placement frame. One end of each support rod is fixedly connected to a spring, and one end of the spring is fixedly connected inside the placement frame.

[0014] Furthermore, the locking mechanism includes an adjusting bolt, which is threadedly connected to one side of the placement frame. One end of the adjusting bolt is rotatably connected to a driving plate, which is slidably connected inside the placement frame. Multiple sliding columns are fixedly connected to one side of the driving plate, and each of the multiple sliding columns is provided with a clamping and fixing component.

[0015] Furthermore, the clamping and fixing assembly includes a top plate, which is fixedly connected to the surface of the sliding column. Each of the multiple support rods has a cross groove inside, and the sliding column is slidably connected in the cross groove. The top plate is located in the cross groove, and a friction pad is fixedly connected to the surface of the top plate.

[0016] This utility model has the following beneficial effects:

[0017] 1. In this invention, after the irregularly shaped injection molded part is placed in the test area of ​​the placement frame, the support ends of several elastic support mechanisms are pressed down to adaptively rise and fall, closely fitting the bottom depressions and irregular areas of the irregularly shaped injection molded part, eliminating local suspension. Subsequently, the posture of the irregularly shaped injection molded part is fixed by the clamping mechanism, and the height of the support ends is solidified by the locking mechanism, forming a rigid support network. This can effectively disperse the testing pressure of the Shore hardness tester body, avoid non-uniform deformation caused by insufficient support at the bottom of the irregularly shaped injection molded part, ensure the stability of the test area, and thus improve the accuracy of hardness test data at the depressions of the irregularly shaped injection molded part.

[0018] 2. When testing multiple different positions of an irregularly shaped injection molded part, this utility model uses motor one to drive lead screw one to rotate, which in turn moves the vertical moving frame, causing the irregularly shaped injection molded part on the surface of the placement frame to move vertically. Then, motor two drives lead screw two to rotate, which in turn moves the placement frame laterally, thus completing the lateral movement of the irregularly shaped injection molded part. This allows for precise control of the perpendicularity between different test positions on the surface of the irregularly shaped injection molded part and the indenter of the Shore hardness tester. The irregularly shaped injection molded part can be tested at multiple different positions on its surface without the need to be re-clamped.

[0019] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the utility model embodiments, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0022] Figure 2 This is a side view of the present invention.

[0023] Figure 3 This is a partial cross-sectional structural diagram of the present invention;

[0024] Figure 4 For the present utility model Figure 3 Enlarged structural diagram at point B;

[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of the support rod of this utility model;

[0026] Figure 6This is a schematic diagram of the clamping and fixing component structure of this utility model;

[0027] Figure 7 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0028] The attached diagram lists the components represented by each number as follows:

[0029] 1. Shore hardness tester body; 2. Placement frame; 3. Position adjustment mechanism; 301. Motor 1; 302. Lead screw 1; 303. Vertical moving frame; 304. Motor 2; 305. Lead screw 2; 4. Clamping mechanism; 401. Bidirectional screw; 402. Handle; 403. Clamping block; 5. Elastic support mechanism; 501. Support rod; 502. Spring; 6. Locking mechanism; 601. Adjusting bolt; 602. Drive plate; 603. Sliding column; 604. Pressing and fixing assembly; 6041. Top plate; 6042. Cross groove; 6043. Friction pad. Detailed Implementation

[0030] The technical solutions of the utility model embodiments will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the utility model, and not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the utility model.

[0031] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0032] Please see Figures 1-7 As shown, this utility model is a hardness tester for testing the quality of injection molded parts, including a Shore hardness tester body 1. The test area of ​​the Shore hardness tester body 1 is provided with a placement frame 2. A position adjustment mechanism 3 is provided between the placement frame 2 and the Shore hardness tester body 1. A clamping mechanism 4 is provided on the surface of the placement frame 2. A plurality of elastic support mechanisms 5 are provided in the test area of ​​the placement frame 2. A locking mechanism 6 is provided at the support end of the elastic support mechanism 5.

[0033] By placing the irregular injection molded part on the support ends of several elastic support mechanisms 5 and pressing it downward, the height of several support ends is adjusted by the elastic force of the elastic ends, so that several support ends are in contact with the bottom of the irregular injection molded part. The clamping mechanism 4 is used to clamp and fix the irregular injection molded part on the elastic support mechanism 5, and the locking mechanism 6 locks the support ends after adjustment.

[0034] First, the Shore hardness tester body 1 is calibrated to zero. Then, the irregularly shaped injection molded part is placed on the test area of ​​the placement frame 2, so that the irregularly shaped injection molded part contacts the support ends of several elastic support mechanisms 5 and is pressed downwards. This allows the height of the support ends to be adjusted by the elastic force of the elastic ends, so that all the support ends are in contact with the bottom of the irregularly shaped injection molded part. Then, the clamping mechanism 4 is activated to clamp and fix the irregularly shaped injection molded part on the elastic support mechanism 5. Finally, the locking mechanism 6 locks the adjusted support ends, causing the bottom of the irregularly shaped injection molded part to be recessed. The Shore hardness tester body 1 is used to support the surface of the irregular injection molded part. The pressure needle is then pressed vertically against the surface of the part. The instantaneous value is read within a few seconds. At least several different positions are tested for each irregular injection molded part. After removing outliers, the average value is taken as the final result. When testing at multiple different positions, the position adjustment mechanism 3 moves the placement frame 2, which moves the irregular injection molded part so that other test points on the surface of the irregular injection molded part are perpendicular to the pressure needle of the Shore hardness tester body 1. Multiple different position tests can be completed without re-clamping the irregular injection molded part.

[0035] After placing the irregular injection molded part in the test area of ​​the placement rack 2, pressing the irregular injection molded part causes the support ends of several elastic support mechanisms 5 to rise and fall adaptively, closely fitting the bottom depressions and irregular areas of the irregular injection molded part, eliminating local suspension. Then, the clamping mechanism 4 fixes the posture of the irregular injection molded part, and the height of the support ends is solidified by the locking mechanism 6, forming a rigid support network. This can effectively disperse the test pressure of the Shore hardness tester body 1, avoid non-uniform deformation caused by insufficient support at the bottom of the irregular injection molded part, ensure the stability of the test area, and thus improve the accuracy of the hardness test data of the depressions of the irregular injection molded part.

[0036] In addition, in specific applications, the working principle of the Shore hardness tester body 1 is based on the difference in depth of the indenter loaded with a built-in spring penetrating the injection molded part under a specific pressure. After the indenter contacts the injection molded part under the pressure of the spring, it rebounds due to the resistance of the injection molded part. The displacement is converted into a Shore hardness value (the larger the value, the higher the hardness) through mechanical or digital devices. The hardness characteristics are objectively reflected by the resistance of the injection molded part to the indenter.

[0037] In one embodiment, the position adjustment mechanism 3 includes a motor 301, which is fixedly connected to one side of the Shore hardness tester body 1. The output shaft of the motor 301 is fixedly connected to a lead screw 302, which is rotatably connected inside the Shore hardness tester body 1. A vertical movement frame 303 is threadedly connected to the surface of the lead screw 302. A motor 304 is fixedly connected to one end of the vertical movement frame 303. The output shaft of the motor 304 is fixedly connected to a lead screw 305, which is rotatably connected inside the vertical movement frame 303. The surface of the lead screw 305 is threadedly connected to the bottom of the placement frame 2.

[0038] When testing multiple different positions on a non-standard injection molded part, motor 301 drives lead screw 302 to rotate, which in turn moves vertical frame 303, causing the non-standard injection molded part on the surface of placement frame 2 to move vertically. Motor 304 drives lead screw 305 to rotate, which in turn moves placement frame 2 laterally, completing the lateral movement of the non-standard injection molded part. This allows for precise control of the perpendicularity between different test positions on the surface of the non-standard injection molded part and the indenter of the Shore hardness tester body 1. The non-standard injection molded part can be tested at multiple different positions without needing to be re-clamped.

[0039] In one embodiment, the clamping mechanism 4 includes a bidirectional screw 401, which is rotatably connected to the surface of the placement frame 2. One end of the bidirectional screw 401 is fixedly connected to a handle 402, and a clamping block 403 is threadedly connected to the surface of the bidirectional screw 401.

[0040] When the irregular injection molded part is located on the surface of the placement rack 2, rotate the handle 402 to drive the bidirectional screw 401 to rotate, so that the bidirectional screw 401 drives the clamping block 403 to contact both sides of the irregular injection molded part, thereby clamping and fixing the irregular injection molded part.

[0041] In one embodiment, the elastic support mechanism 5 includes multiple support rods 501, which are slidably connected inside the placement frame 2. One end of each support rod 501 is fixedly connected to a spring 502, and one end of the spring 502 is fixedly connected inside the placement frame 2.

[0042] When the irregular injection molded part is pressed onto the surface of the placement frame 2, the bottom of the irregular injection molded part contacts one end of the support rod 501, causing one end of the support rod 501 to compress the spring 502. At the same time, the support rod 501 slides inside the placement frame 2. Through the elastic action of the spring 502, one end of the support rod 501 always contacts the bottom of the irregular injection molded part.

[0043] In one embodiment, the locking mechanism 6 includes an adjusting bolt 601 threadedly connected to one side of the placement frame 2. One end of the adjusting bolt 601 is rotatably connected to a driving plate 602, which is slidably connected inside the placement frame 2. Multiple sliding columns 603 are fixedly connected to one side of the driving plate 602. Each of the multiple sliding columns 603 has a pressing and fixing assembly 604 on its surface. The pressing and fixing assembly 604 includes a top plate 6041 fixedly connected to the surface of the sliding columns 603. Multiple support rods 501 have cross grooves 6042 inside, and the sliding columns 603 are slidably connected to the cross grooves 6042. The top plate 6041 is located in the cross grooves 6042, and a friction pad 6043 is fixedly connected to the surface of the top plate 6041.

[0044] The elasticity of spring 502 ensures that one end of support rod 501 remains in contact with the bottom of the irregular injection molded part. To fix support rod 501, rotate adjusting bolt 601, causing it to drive plate 602 to slide inside the placement frame 2. This causes plate 602 to drive multiple sliding posts 603 to slide within the cross groove 6042 inside support rod 501. Simultaneously, the multiple sliding posts 603 drive top plate 6041 to contact the groove surface of cross groove 6042, causing top plate 6041 to drive friction pad 6043 to press against cross groove 6042, thus fixing support rod 501. Friction pad 6043 increases the friction between support rod 501 and top plate 6041, further improving the fixing effect. By fixing support rod 501, the Shore hardness tester body 1 avoids uneven deformation caused by insufficient support at the bottom of the irregular injection molded part during testing, ensuring stable force in the test area and improving the accuracy of hardness test data for the recessed areas of the irregular injection molded part.

[0045] Through the above technical solution, 1. When the irregular injection molded part is pressed onto the surface of the placement frame 2, the bottom of the irregular injection molded part contacts one end of the support rod 501, causing one end of the support rod 501 to compress the spring 502. At the same time, the support rod 501 slides inside the placement frame 2. Through the elastic action of the spring 502, one end of the support rod 501 always contacts the bottom of the irregular injection molded part. Turning the handle 402 causes the handle 402 to drive the bidirectional screw 401 to rotate, causing the bidirectional screw 401 to drive the clamping block 403 to contact both sides of the irregular injection molded part, clamping and fixing the irregular injection molded part. At this time, it is necessary to fix the support rod 501. Turning the adjusting bolt 601 adjusts the... Bolt 601 drives plate 602 to slide inside the mounting frame 2, causing plate 602 to drive multiple sliding columns 603 to slide within the cross groove 6042 inside support rod 501. Simultaneously, multiple sliding columns 603 drive top plate 6041 to contact the groove surface of cross groove 6042, causing top plate 6041 to drive friction pad 6043 to press against cross groove 6042, thus fixing support rod 501 and forming a rigid support network. This effectively disperses the testing pressure of Shore hardness tester body 1, avoids non-uniform deformation caused by insufficient support at the bottom of irregular injection molded parts, ensures stable force in the test area, and thus improves the accuracy of hardness test data at the recesses of irregular injection molded parts.

[0046] 2. By rotating the lead screw 302 driven by motor 301 when testing different positions of the irregular injection molded part, the lead screw 302 moves the vertical moving frame 303, causing the irregular injection molded part on the surface of the placement frame 2 to move vertically. By rotating the lead screw 305 driven by motor 304, the placement frame 2 moves horizontally, thus completing the lateral movement of the irregular injection molded part. This allows for precise control of the perpendicularity between different test positions on the surface of the irregular injection molded part and the indenter of the Shore hardness tester body 1. The irregular injection molded part can be tested at multiple different positions on its surface without needing to be re-clamped.

[0047] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] The preferred embodiments of the utility model disclosed above are merely illustrative of the utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the utility model, thereby enabling those skilled in the art to better understand and utilize it. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A durometer for testing the quality of injection-molded parts, comprising a Shore durometer body (1), characterized in that, The testing area of ​​the Shore hardness tester body (1) is provided with a placement frame (2), and a position adjustment mechanism (3) is provided between the placement frame (2) and the Shore hardness tester body (1). A clamping mechanism (4) is provided on the surface of the placement frame (2), and a number of elastic support mechanisms (5) are provided in the testing area of ​​the placement frame (2). A locking mechanism (6) is provided at the support end of the elastic support mechanism (5). By placing the irregular injection molded part on the support ends of several elastic support mechanisms (5) and pressing it downward, the height of several support ends is adjusted by the elastic force of the elastic end, so that several support ends are in contact with the bottom of the irregular injection molded part. The clamping mechanism (4) is used to clamp and fix the irregular injection molded part on the elastic support mechanism (5), and the locking mechanism (6) locks the support ends that have been adjusted.

2. A durometer for testing the quality of injection molded parts according to claim 1, characterized in that The position adjustment mechanism (3) includes a motor (301), which is fixedly connected to one side of the Shore hardness tester body (1). The output shaft of the motor (301) is fixedly connected to a lead screw (302), which is rotatably connected inside the Shore hardness tester body (1). A vertical shifting frame (303) is threaded onto the surface of the lead screw (302).

3. A durometer for testing the quality of injection molded parts according to claim 2, characterized in that One end of the vertical moving frame (303) is fixedly connected to a motor (304), and the output shaft of the motor (304) is fixedly connected to a lead screw (305). The lead screw (305) is rotatably connected inside the vertical moving frame (303), and the surface of the lead screw (305) is threadedly connected to the bottom of the placement frame (2).

4. A durometer for testing the quality of injection molded parts according to claim 1, characterized in that The clamping mechanism (4) includes a bidirectional screw (401), which is rotatably connected to the surface of the placement frame (2). One end of the bidirectional screw (401) is fixedly connected to a handle (402), and a clamping block (403) is threadedly connected to the surface of the bidirectional screw (401).

5. A durometer for testing the quality of injection molded parts according to claim 1, characterized in that The elastic support mechanism (5) includes a support rod (501), and multiple support rods (501) are provided. All multiple support rods (501) are slidably connected inside the placement frame (2). One end of each of the multiple support rods (501) is fixedly connected to a spring (502), and one end of the spring (502) is fixedly connected inside the placement frame (2).

6. A durometer for testing the quality of injection molded parts according to claim 5, characterized in that The locking mechanism (6) includes an adjusting bolt (601), which is threadedly connected to one side of the placement frame (2). One end of the adjusting bolt (601) is rotatably connected to a driving plate (602), which is slidably connected inside the placement frame (2). Multiple sliding columns (603) are fixedly connected to one side of the driving plate (602), and each of the multiple sliding columns (603) is provided with a pressing and fixing component (604).

7. A durometer for testing the quality of injection molded parts according to claim 6, characterized in that The clamping and fixing assembly (604) includes a top plate (6041), which is fixedly connected to the surface of the sliding column (603). Each of the multiple support rods (501) has a cross groove (6042) inside. The sliding column (603) is slidably connected in the cross groove (6042). The top plate (6041) is located in the cross groove (6042). A friction pad (6043) is fixedly connected to the surface of the top plate (6041).

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