A hardness testing machine for plastic products

Abstract

This utility model provides a hardness testing machine for plastic products, relating to the field of plastic product technology. It includes a testing platform with a rotation adjustment mechanism above it. The rotation adjustment mechanism includes a drive rod, the outer part of which is rotatably connected to the inner wall of the upper end of the testing platform via a bearing. A placement plate is fixedly connected to the upper end of the drive rod, and a worm gear is fixedly sleeved on the lower end of the drive rod inside the testing platform. An annular support guide rail is fixedly connected to the upper end of the testing platform. Through the rotation adjustment mechanism, the worm gear transmission, in conjunction with the annular support guide rail, achieves stable rotation of the plastic product and omnidirectional testing coverage. The moving testing mechanism relies on a second electric hydraulic cylinder and a sliding block sliding on a slide rod to achieve horizontal multi-point moving testing of the Shore hardness tester. This not only ensures the stability of the plastic product during testing but also significantly improves testing efficiency and comprehensiveness, thereby greatly enhancing the accuracy of the overall testing results.

Description

Technical Field

[0001] This utility model relates to the field of plastic products technology, and in particular to a hardness testing machine for plastic products. Background Technology

[0002] Plastic products are a general term for daily necessities and industrial products made primarily from plastic. After plastic products are processed, they need to be tested for hardness. This is usually done using a Shore hardness tester. However, current plastic products can only be tested on one part at a time. When different parts need to be tested, the product needs to be disassembled and repositioned to test different parts, making the whole process quite cumbersome.

[0003] For example, a hardness testing machine for plastic products disclosed in Chinese patent literature (publication number: CN221803600U) uses a combination of a motor, a transmission rod, and a plastic product placement plate. When in use, the plastic product is placed on the surface of the plastic product placement plate, and then the motor is connected to an external power source to drive the transmission rod and the plastic product placement plate to rotate and adjust the angle, thereby playing the role of adjusting the testing angle for the plastic product during the hardness testing process.

[0004] However, when the motor drives the plastic product placement plate and the plastic products on the plate to rotate and adjust the angle via the transmission rod, the Shore hardness tester's pressing test point is always in the same spatial position. It can only press and test the annular area on the plastic product corresponding to the test point. When it is necessary to focus on testing specific parts such as edges and corners of cuboid plastic products, it can only detect the annular area in the center of the plate. The edges, corners, and other areas where uneven hardness is prone to occur cannot be reached at all. This means that the test results can only reflect the hardness of a local area of ​​the plastic product and cannot fully represent the hardness uniformity and overall quality of the entire product. This may lead to misjudgment of product qualification due to incomplete test data, creating potential quality problems for subsequent use. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as incomplete testing of the hardness of plastic products, resulting in incomplete test data and an inability to accurately detect the overall hardness and quality of plastic products.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A hardness testing machine for plastic products includes a testing table, and a rotation adjustment mechanism is provided above the testing table.

[0008] The rotation adjustment mechanism includes a drive rod, the outer side of which is rotatably connected to the upper inner wall of the testing platform via a bearing. A placement plate is fixedly connected to the upper end of the drive rod, and the lower end of the drive rod extends into the interior of the testing platform and is fixedly sleeved with a worm gear. An annular support guide rail is fixedly connected to the upper end of the testing platform, and an arc-shaped sliding sleeve distributed in an annular array is slidably sleeved on the outer side of the annular support guide rail. The upper ends of the plurality of arc-shaped sliding sleeves are all fixedly connected to the lower end of the placement plate.

[0009] A mobile testing mechanism is installed above the testing station.

[0010] Preferably, a servo motor is fixedly installed on the inner bottom wall of the testing platform, and a worm gear is fixedly installed on the output shaft of the servo motor through a coupling, with the outer surface of the worm gear meshing with the tooth surface of the worm wheel.

[0011] Preferably, the upper end of the placement tray is fixedly connected to a symmetrically distributed mounting plate, and a first servo electric cylinder is fixedly mounted on one side of the mounting plate. One end of the piston rod of the first servo electric cylinder extends through to the other side of the mounting plate and is fixedly connected to a fixing frame.

[0012] Preferably, a protective pad is fixedly installed on one inner wall of the fixing frame, and symmetrically distributed guide rods are fixedly connected to one side of the fixing frame, with one end of each of the two guide rods penetrating and extending to one side of the mounting plate.

[0013] Preferably, the front and back of the fixing frame are fixedly mounted with symmetrically distributed second servo electric cylinders, one end of the piston rod of the second servo electric cylinder penetrating into the interior of the fixing frame and fixedly connected to an auxiliary clamping plate.

[0014] Preferably, the mobile detection mechanism includes a support frame, the lower end of which is fixedly connected to the upper end of the detection table, and the upper end of the support frame is provided with an installation through groove.

[0015] Preferably, symmetrically distributed sliding rods are fixedly connected to the inner walls of both sides of the mounting groove, and sliding blocks are slidably sleeved on the outside of each of the two sliding rods, with the outside of the sliding blocks slidably connected to the inner wall of the mounting groove.

[0016] Preferably, a first electro-hydraulic cylinder is fixedly installed on the inner wall of the sliding block, a Shore hardness tester is fixedly installed at one end of the piston rod of the first electro-hydraulic cylinder, and a second electro-hydraulic cylinder is fixedly installed on one side of the inner wall of the mounting groove, with one end of the piston rod of the second electro-hydraulic cylinder fixedly connected to one side of the sliding block.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] In this invention, the worm gear transmission in the rotation adjustment mechanism, combined with the ring support guide rail, enables stable rotation of the plastic product and all-round detection coverage. The moving detection mechanism relies on the second electric hydraulic cylinder and the sliding block to slide on the slide rod, achieving horizontal multi-point moving detection of the Shore hardness tester. This not only ensures the stability of the plastic product during the detection process but also greatly improves the detection efficiency and comprehensiveness, thereby greatly improving the accuracy of the overall detection results. Attached Figure Description

[0019] Figure 1 A schematic diagram of the main structure of a hardness testing machine for plastic products provided by this utility model;

[0020] Figure 2 A three-dimensional view of the testing platform structure of a hardness testing machine for plastic products provided by this utility model;

[0021] Figure 3 A three-dimensional view of the fixing frame structure of a hardness testing machine for plastic products provided by this utility model;

[0022] Figure 4 A three-dimensional view of the sliding block structure of a hardness testing machine for plastic products provided by this utility model.

[0023] Legend: 1. Testing table; 2. Drive rod; 21. Placement tray; 22. Worm gear; 23. Annular support guide rail; 24. Arc-shaped sliding sleeve; 25. Servo motor; 26. Worm gear; 27. Mounting plate; 28. First servo electric cylinder; 29. ​​Fixing frame; 210. Protective pad; 211. Guide rod; 212. Second servo electric cylinder; 213. Auxiliary clamping plate; 3. Support frame; 31. Mounting through slot; 32. Sliding rod; 33. Sliding block; 34. First electric hydraulic cylinder; 35. Shore hardness tester; 36. Second electric hydraulic cylinder. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0025] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below with reference to relevant embodiments, and several embodiments of this utility model will be given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this utility model more thorough and complete.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] Example

[0029] like Figures 1-4 As shown, this utility model provides a technical solution: a hardness testing machine for plastic products, including a testing platform 1 and a rotation adjustment mechanism above the testing platform 1, which provides stable and accurate rotation support and multi-directional clamping guarantee for the hardness testing of plastic products, and completely solves the problems of unstable rotation, insecure clamping and large angle deviation in traditional testing.

[0030] The core component, drive rod 2, is rotatably connected to the upper inner wall of the testing table 1 via a bearing. The upper end is fixedly placed on a plate 21 to support plastic products, and the lower end extends into the interior of the testing table 1 and is fixedly fitted with a worm gear 22.

[0031] The servo motor 25 installed on the inner bottom wall of the testing table 1 has its output shaft meshing with the tooth surface of the worm gear 22 via a worm 26 fixed by a coupling. This transmission method has a self-locking characteristic, which can effectively prevent the placement plate 21 from rotating unexpectedly due to external forces, such as the pressing of the Shore hardness tester 35, during the testing process, and ensure the stability of the plastic product position during testing.

[0032] Meanwhile, the worm gear 22 and worm 26 provide smooth transmission, making the rotation angle of the placement disc 21 precise and controllable. Compared with the traditional manual rotation method, the adjustment efficiency is improved, and the angle deviation problem that is easy to cause by manual rotation is completely avoided, ensuring the consistency of the rotation angle each time and providing a precise angle basis for all-round detection.

[0033] The upper end of the testing table 1 is fixed with an annular support guide rail 23, and the outer sliding sleeve of the annular array arc-shaped sliding sleeve 24 is fixedly connected to the lower end of the placement plate 21. The sliding cooperation between the arc-shaped sliding sleeve 24 and the annular support guide rail 23 provides strong and stable support for the placement plate 21.

[0034] Even when bearing heavy products, it can effectively prevent the placement tray 21 from tilting due to load or rotation, ensuring that the plastic products remain horizontal during the testing process, making the pressing test of the Shore hardness tester 35 more accurate.

[0035] The symmetrical mounting plate 27 is fixed at the upper end of the placement plate 21. The first servo electric cylinder 28 is installed on one side. One end of its piston rod passes through the mounting plate 27 and is fixedly connected to the fixing frame 29. The protective pad 210 installed on the inner wall of one side of the fixing frame 29 is made of elastic rubber. When clamping plastic products, it can increase the friction with the surface of the product to prevent the product from sliding, and the elasticity of the rubber can buffer the clamping force to avoid damaging the surface of the product.

[0036] A symmetrical guide rod 211 fixed on one side of the fixing frame 29 extends through to one side of the mounting plate 27, providing precise guidance for the movement of the fixing frame 29, keeping the fixing frame 29 stable when moving, and ensuring that the clamping positions of the two fixing frames 29 on both sides of the plastic product are symmetrical and precise.

[0037] The symmetrical second servo electric cylinders 212 mounted on the front and back of the mounting bracket 29 have one end of their piston rods that penetrate into the interior of the mounting bracket 29 and fix the auxiliary clamping plate 213. This allows for further fixation of the plastic product from both the front and back. This multi-directional clamping design improves clamping stability and meets diverse testing needs.

[0038] The movable testing mechanism above the testing platform 1 enables precise horizontal movement and multi-point testing of the Shore hardness tester 35, greatly improving the comprehensiveness and efficiency of the testing. The lower end of the support frame 3 is fixedly connected to the upper end of the testing platform 1, providing a stable installation foundation for the entire movable testing mechanism. The installation slot 31 opened at the upper end provides space for the movement of the sliding block 33.

[0039] Symmetrical sliding rods 32 are fixed to the inner walls on both sides of the mounting slot 31, and sliding blocks 33 are externally slidably connected to the inner wall of the mounting slot 31. The sliding rods 32 provide stable guidance for the movement of the sliding blocks 33, ensuring that the Shore hardness tester 35 maintains a precise trajectory during horizontal movement, thus guaranteeing the accuracy of multi-point testing.

[0040] The first electric hydraulic cylinder 34 installed on the inner wall of the sliding block 33 can drive the Shore hardness tester 35 to move up and down, realizing the pressing test action on the plastic product. The second electric hydraulic cylinder 36 installed on the inner wall of one side of the mounting groove 31 has one end of its piston rod fixedly connected to one side of the sliding block 33, which can push the sliding block 33 to move along the slide rod 32, so that the Shore hardness tester 35 can perform multi-point testing in the horizontal direction.

[0041] By controlling the extension and retraction of the second electric hydraulic cylinder 36, the spacing between detection points can be precisely controlled. Compared with the traditional single-point detection method, the detection coverage is improved. This multi-point detection mode can more comprehensively reflect the hardness distribution of plastic products, avoid misjudging the quality of products due to the one-sidedness of single-point detection results, and provide more reliable and comprehensive data support for the quality assessment of plastic products.

[0042] It should be noted that the electrical equipment mentioned above is all programmed and controlled using existing PLC controllers. Since this is a mature technology, it will not be described in detail.

[0043] The working process of this utility model:

[0044] Step 1: During testing, the plastic product is first placed in the center above the placement tray 21. Then, the first servo electric cylinder 28 is activated, and its piston rod extends. Under the guidance of the guide rod 211, it drives the fixed frame 29 to move. The two fixed frames 29 move relative to each other. The protective pad 210 on one side of the inner wall of the fixed frame 29 is used to fix and clamp the plastic product on both sides to prevent the plastic product from swaying from side to side during testing. Next, the second servo electric cylinder 212 is activated, and its piston rod extends to push the auxiliary clamping plate 213 to move. The auxiliary clamping plate 213 is then attached to the front and back of the plastic product for auxiliary clamping, which further enhances the stability of the plastic product during testing and avoids displacement of the plastic product due to testing force, thus affecting the test results.

[0045] Step 2: After fixing the plastic product, start the first electric hydraulic cylinder 34, extend its piston rod, and drive the Shore hardness tester 35 to move downward to test the hardness of the plastic product. At the same time, start the second electric hydraulic cylinder 36, extend its piston rod, and push the sliding block 33 to slide along the sliding rod 32 in the mounting groove 31, thereby driving the Shore hardness tester 35 to move horizontally. This enables hardness testing of multiple points on the plastic product in the horizontal direction without the need for manual adjustment of the testing position, thus improving testing efficiency and the comprehensiveness of the testing points.

[0046] Step 3: Based on the horizontal detection, start the servo motor 25. The output shaft of the servo motor 25 drives the worm gear 26 to rotate through the coupling. Since the worm gear 26 meshes with the tooth surface of the worm wheel 22, the rotation of the worm gear 26 will drive the worm wheel 22 to rotate, which in turn causes the drive rod 2, which is fixedly sleeved with the worm wheel 22, to rotate. When the drive rod 2 rotates, it drives the placement tray 21 and the plastic products on it to rotate. The rotation range of the drive rod 2 is controlled within 180 degrees in both directions, which can effectively avoid the problem of the detection circuit tangling. During the rotation of the placement tray 21, the ring support guide rail 23 and the arc-shaped sliding sleeve 24 cooperate to stably support the placement tray 21, preventing the placement tray 21 from tilting due to the weight of the plastic products or rotation, and ensuring the accuracy of the detection. The rotation of the placement tray 21, combined with the horizontal movement detection of the Shore hardness tester 35, can perform all-round hardness detection on the plastic products, covering more detection areas and making the detection results more comprehensive and accurate.

[0047] 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 hardness testing machine for plastic articles, comprising a testing table (1), characterized in that: A rotation adjustment mechanism is provided above the testing platform (1); The rotation adjustment mechanism includes a drive rod (2), the outside of which is rotatably connected to the upper inner wall of the testing platform (1) via a bearing. The upper end of the drive rod (2) is fixedly connected to a placement plate (21), the lower end of which extends into the interior of the testing platform (1) and is fixedly sleeved with a worm gear (22). The upper end of the testing platform (1) is fixedly connected to an annular support guide rail (23), and the outside of the annular support guide rail (23) is slidably sleeved with an arc-shaped sliding sleeve (24) arranged in an annular array. The upper ends of the multiple arc-shaped sliding sleeves (24) are all fixedly connected to the lower end of the placement plate (21). A mobile testing mechanism is provided above the testing station (1).

2. The hardness testing machine for plastic products according to claim 1, characterized in that: A servo motor (25) is fixedly installed on the inner bottom wall of the testing platform (1). The output shaft of the servo motor (25) is fixedly installed with a worm gear (26) through a coupling. The outer surface of the worm gear (26) meshes with the tooth surface of the worm wheel (22).

3. The hardness testing machine for plastic products according to claim 1, characterized in that: The upper end of the placement plate (21) is fixedly connected to a symmetrically distributed mounting plate (27). A first servo electric cylinder (28) is fixedly installed on one side of the mounting plate (27). One end of the piston rod of the first servo electric cylinder (28) extends through to the other side of the mounting plate (27) and is fixedly connected to a fixing bracket (29).

4. The hardness testing machine for plastic products according to claim 3, characterized in that: A protective pad (210) is fixedly installed on one side of the inner wall of the fixing frame (29), and a guide rod (211) is fixedly connected to one side of the fixing frame (29) in a symmetrical arrangement. One end of each of the two guide rods (211) passes through and extends to one side of the mounting plate (27).

5. The hardness testing machine for plastic products according to claim 3, characterized in that: The front and back of the fixed frame (29) are fixedly installed with symmetrically distributed second servo electric cylinders (212). One end of the piston rod of the second servo electric cylinder (212) passes through the interior of the fixed frame (29) and is fixedly connected with an auxiliary clamp (213).

6. The hardness testing machine for plastic products according to claim 1, characterized in that: The mobile testing mechanism includes a support frame (3), the lower end of which is fixedly connected to the upper end of the testing platform (1), and the upper end of the support frame (3) is provided with an installation through groove (31).

7. The hardness testing machine for plastic products according to claim 6, characterized in that: The inner walls of both sides of the mounting groove (31) are fixedly connected with symmetrically distributed sliding rods (32), and sliding blocks (33) are slidably sleeved on the outside of the two sliding rods (32). The outside of the sliding blocks (33) is slidably connected to the inner wall of the mounting groove (31).

8. The hardness testing machine for plastic products according to claim 7, characterized in that: A first electric hydraulic cylinder (34) is fixedly installed on the inner wall of the sliding block (33). A Shore hardness tester (35) is fixedly installed on one end of the piston rod of the first electric hydraulic cylinder (34). A second electric hydraulic cylinder (36) is fixedly installed on the inner wall of one side of the mounting groove (31). One end of the piston rod of the second electric hydraulic cylinder (36) is fixedly connected to one side of the sliding block (33).

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