A molding device for preparing a plastic sample

Abstract

The utility model provides a kind of preparation plastic sample forming device, including the impact molding device of sample diameter that can be prepared and the cutting molding device of sample thickness that can be prepared, impact molding device and cutting molding device can be independently disassembled, they are used to realize the accurate molding of plastic sample diameter and thickness with cooperation, adapt to the preparation demand of plastic sample in oxidation induction time and oxidation induction temperature test.The device can realize the accurate preparation of plastic sample diameter and thickness respectively by the synergic cooperation of impact molding device and cutting molding device, solves the problem that conventional manual preparation mode precision is insufficient and general equipment cannot consider diameter and thickness accurate control, effectively guarantees the strict requirement of sample size of oxidation induction test, improves the accuracy of test result.

Description

Technical Field

[0001] This utility model belongs to the technical field of sample preparation devices, and in particular relates to a plastic sample preparation device. Background Technology

[0002] In the field of plastic material performance testing, oxidation induction time (OIT) and oxidation induction temperature (OIT) tests are key methods for evaluating the thermal stability of plastic materials. These tests have strict requirements on the dimensional accuracy of plastic samples, requiring the samples to have precise diameter and thickness specifications.

[0003] Currently, the main problems in the industry when preparing plastic samples that meet the above test requirements are as follows: When using manual cutting, the sample size accuracy depends entirely on the operator's experience and skills, making it difficult to guarantee the consistency of diameter and thickness, and easily resulting in excessive size deviation, which directly affects the accuracy of test results; at the same time, manual cutting is inefficient, and the sample surface is prone to defects such as burrs and unevenness.

[0004] While existing general-purpose stamping equipment can control sample diameter to some extent, it cannot simultaneously achieve precise thickness measurement, requiring secondary processing and making operation cumbersome. Furthermore, most of these devices are monolithic structures, making disassembly, maintenance, and transportation inconvenient; damaged components necessitate replacement of the entire unit, resulting in high operating costs. In addition, existing equipment lacks adaptation designs for samples specifically designed for oxidation-induced testing, making it difficult to flexibly meet the needs of preparing samples of different specifications, thus exhibiting poor applicability.

[0005] Therefore, the market urgently needs a specialized molding device that can simultaneously and accurately control the diameter and thickness of plastic samples, is easy to operate and maintain, and can be adapted to the needs of oxidation-induced testing. Utility Model Content

[0006] The purpose of this invention is to provide a device for preparing plastic samples to solve the problems mentioned in the background art.

[0007] In view of this, the present invention provides a plastic sample forming device, including an impact forming device capable of forming the sample diameter and a cutting forming device capable of forming the sample thickness. The impact forming device and the cutting forming device can be disassembled independently, and the two are used together to achieve precise forming of the plastic sample diameter and thickness, which is suitable for the plastic sample preparation requirements in oxidation induction time and oxidation induction temperature tests.

[0008] In a further embodiment of this invention, the impact molding device includes a handle, a sample platform, a rotating assembly, an impact head, and a tamping rod. The sample platform is used to support the plastic raw material to be processed. The handle is connected to the rotating assembly in a transmission manner. Pressing the handle can drive the rotating assembly to rotate and generate a downward impact force. The impact head is fixed below the rotating assembly. The impact force generated by the rotating assembly can drive the impact head to impact the plastic raw material on the sample platform to form a cylindrical plastic sample. The tamping rod is used to remove the cylindrical plastic sample after impact molding from the impact head or the sample platform.

[0009] In a further embodiment of this invention, the impact forming device further includes a clamping ring, which is sleeved on the connection between the impact head and the rotating assembly. By adjusting the tightness of the clamping ring, the impact head and the rotating assembly can be detachably connected, making it convenient to replace impact heads of different specifications.

[0010] In a further embodiment of this invention, the impact head is provided with a variety of inner diameter specifications, and the impact head with different inner diameter specifications corresponds to the forming of cylindrical plastic samples of different diameters, so as to adapt to the sample preparation scenarios with different diameter requirements in oxidation-induced testing.

[0011] In a further embodiment of this utility model, the cutting and forming device includes a fixed connector, a telescopic spring, a force-bearing rod, a lifting rod, a pressure plate, and a cutting chamber. The telescopic spring is sleeved between the fixed connector and the force-bearing rod to form a transmission structure that can elastically extend and retract. The lifting rod is fixedly connected to the pressure plate. Pulling the lifting rod can drive the pressure plate to move upward. After releasing the lifting rod, the pressure plate can press down under the elastic force of the telescopic spring to fix the cylindrical plastic sample to be cut in the cutting chamber.

[0012] In a further embodiment of this utility model, the cutting and forming device further includes a device body, a graduated slide rail, a cutting fixture, and fixing bolts. The graduated slide rail is provided with millimeter-level scale markings and is located on the device body to accurately indicate the cutting thickness. The cutting fixture is slidably connected to the graduated slide rail and can move along the length direction of the graduated slide rail to adjust the cutting position. The force-bearing rod has spiral fixing holes on both sides of its longitudinal direction. The fixing bolts pass through the spiral fixing holes and are threadedly connected to the cutting fixture to fix the cutting fixture at the preset cutting position.

[0013] In a further embodiment of this invention, the cutting and forming device further includes a blade head that passes through a cutting fixture and pushes the blade head to cut the cylindrical plastic sample fixed in the cutting chamber. The cutting fixture has adjustment holes at both ends, and an adjustment rod is rotatably mounted on the device body. The adjustment rod passes through the adjustment hole and is threadedly connected to the adjustment hole. The up-and-down movement of the cutting fixture can be adjusted by rotating the adjustment rod.

[0014] In a further embodiment of this invention, the cutting surface of the blade is in close contact with the lower surface of the pressure plate and the inner wall of the cutting chamber, and there are no gaps in the contact area, so as to ensure that the surface of the cut plastic sample is parallel, flat and burr-free.

[0015] The beneficial effects of this utility model are:

[0016] This device, through the coordinated operation of an impact forming device and a cutting forming device, can accurately produce the diameter and thickness of plastic samples, solving the problems of insufficient precision in traditional manual production methods and the inability of general equipment to simultaneously control the precise diameter and thickness. It effectively ensures the strict requirements of oxidation-induced testing on sample size and improves the accuracy of test results.

[0017] The impact forming device adopts a transmission structure of handle and rotating component. Pressing the handle drives the impact head to complete the sample diameter forming, which is simple and convenient to operate. With multiple inner diameter impact heads that can be quickly replaced by clamps, it can flexibly meet the needs of sample preparation of different diameters and has strong adaptability.

[0018] In the cutting and forming device, the graduated slide rail can achieve thickness adjustment with millimeter-level precision. Combined with the pressure plate structure driven by the telescopic spring, it can firmly fix the sample in the cutting chamber, avoid sample displacement during the cutting process, and ensure that the cutting surface is parallel and flat. The tight fit design between the cutter head and the lower surface of the pressure plate and the inner wall of the cutting chamber effectively prevents burrs from forming on the sample surface and ensures sample quality.

[0019] Both the impact forming device and the cutting forming device adopt a detachable design, and each component can be disassembled independently. This not only facilitates daily cleaning, maintenance and component replacement, reducing usage costs, but also allows for disassembly and storage when not in use, saving storage space and making it easy to carry and transport. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the impact forming device of this utility model;

[0021] Figure 2 This is a schematic diagram of the cutting and forming device of this utility model;

[0022] Figure 3 This is a schematic diagram of another part of the cutting and forming device of this utility model;

[0023] Figure 4 This is an exploded structural diagram of the cutting and forming device of this utility model. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0025] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0026] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0028] It should be noted that, in this application, 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 limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but can also include performing functions substantially simultaneously or in the reverse order, for example, performing the described methods in a different order than described, and adding, omitting, or combining various steps. Additionally, features described with reference to certain examples can be combined in other examples.

[0029] This embodiment provides a plastic sample preparation device, including an impact forming device 1 capable of preparing the sample diameter and a cutting forming device 2 capable of preparing the sample thickness. The impact forming device 1 and the cutting forming device 2 can be disassembled independently. The two are used together to achieve precise preparation of the plastic sample diameter and thickness, which is suitable for the preparation requirements of plastic samples in oxidation induction time and oxidation induction temperature tests.

[0030] By separating the impact forming and cutting forming functions into two independently operable and collaborative devices, the problem of fixed functions and difficulty in achieving dual precision control of diameter and thickness in traditional integrated equipment is solved. The independent disassembly design not only facilitates the storage, transportation, and maintenance of the equipment, but also allows one device to be used alone to complete some processing steps according to actual needs, greatly improving the equipment's flexibility and adaptability to different scenarios. In particular, for the stringent requirements of oxidation-induced testing on sample size, it achieves one-stop precision processing from raw materials to qualified test samples.

[0031] In this embodiment, the impact molding device 1 further includes a handle 10, a sample platform 11, a rotating assembly 12, an impact head 13, and a tamping rod 14. The sample platform 11 is used to support the plastic raw material to be processed. Its surface is polished to avoid scratching the surface of the raw material. When the handle 10 is pressed, it can drive the rotating assembly 12 to generate a rotational motion while applying a downward impact force. The impact head 13 is fixed to the bottom of the rotating assembly 12 by a high-strength bolt 15. Its end edge adopts a rounded transition design to reduce the risk of raw material cracking during impact. The impact force generated by the rotating assembly 12 can drive the impact head 13 to vertically impact the plastic raw material on the sample platform 11. Through the combined squeezing action of the impact head 13 and the sample platform 11, a cylindrical plastic sample conforming to a preset diameter is quickly formed. The tamping rod 14 is made of hard alloy material. Its diameter is slightly smaller than the inner diameter of the impact head 13. It is used to remove the cylindrical plastic sample from the inner cavity of the impact head 13 or the sample platform 11 without damage after impact molding. This structure achieves precise control of impact force through mechanical transmission, which greatly improves the consistency of sample diameter compared to manual stamping. The design of the rotating component 12 makes the impact process more stable, reducing burrs and deformation at the sample edges. The special design of the tamping rod 14 avoids damage to the sample during the material handling process, ensuring the integrity of the sample.

[0032] In this embodiment, the impact forming device 1 further includes a clamping ring 16 made of high-strength elastic steel with anti-slip texture on its inner wall. The clamping ring 16 is fitted onto the outside of the connection between the impact head 13 and the rotating assembly 12. The tightness of the clamping ring 16 can be changed by rotating the bolt 15. When the adjusting bolt 15 is tightened, the clamping ring 16 contracts and securely connects the impact head 13 and the rotating assembly 12; when the adjusting bolt 15 is loosened, the clamping ring 16 expands, easily separating the impact head 13 from the rotating assembly 12, thus allowing for quick replacement of impact heads 13 of different specifications. Compared to traditional welding or fixed connections, this detachable connection structure reduces the impact head 13 replacement operation from requiring specialized tools to minutes, significantly improving the equipment's changeover efficiency, meeting the need for rapid switching between processing samples of different diameters on the same equipment, and reducing the workload of operators.

[0033] In this embodiment, the impact head 13 is further provided with various inner diameter specifications, including but not limited to common sizes such as 5mm, 6mm, 8mm, and 10mm. Each specification of the impact head 13 is made of Cr12MoV mold steel material through heat treatment, which has extremely high wear resistance and dimensional stability. The surface roughness of the inner cavity of the impact head 13 is no greater than Ra0.8μm to ensure the smoothness of the outer surface of the molded sample. The impact head 13 with different inner diameter specifications corresponds to the molding of cylindrical plastic samples of different diameters, and its diameter tolerance is controlled within ±0.05mm, which fully meets the high precision requirements for sample diameter in oxidation-induced testing. The corresponding specification of the impact head 13 can be flexibly selected according to the specific needs of different standards or testing instruments, adapting to various sample preparation scenarios with different diameter requirements in oxidation-induced testing. The standardized design with multiple specifications enables the equipment to cover the sample needs of most plastic material testing, avoiding the cost waste of purchasing equipment separately for different sizes.

[0034] In this embodiment, the cutting and forming device 2 further includes a fixed connector 20, a telescopic spring 21, a force-bearing rod 22, a lifting rod 23, a pressure plate 24, and a cutting chamber 25. The fixed connector 20 has sufficient rigidity to ensure the stability of the cutting process. The telescopic spring 21 is a high-strength compression spring, with its two ends connected to the fixed connector 20 and the force-bearing rod 22 respectively. It is sleeved on the outside of the guide post between the fixed connector 20 and the force-bearing rod 22, forming a transmission structure that can elastically extend and retract. The lifting rod 23 is fixedly connected to the center position of the pressure plate 24 by threads. Pulling the lifting rod 23 can drive the pressure plate 24 to move upward along the guide post and compress the telescopic spring 21. After releasing the lifting rod 23, the pressure plate 24 can smoothly press down under the elastic force of the telescopic spring 21. This fixing structure achieves automatic clamping through spring force. Compared with manual tightening, it is not only more convenient to operate, but also provides a uniform and stable clamping force, avoiding deformation or displacement of the sample due to uneven force, and ensuring the accuracy of the cutting thickness.

[0035] In this embodiment, the cutting and forming device 2 further includes a device body 26, a graduated slide rail 27, a cutting fixture 28, and fixing bolts 29. The graduated slide rail 27 is located on the side of the device body 26 and has clear millimeter-level graduations with a minimum graduation of 0.1mm for precise indication of the cutting thickness. The cutting fixture 28 can move smoothly along the length of the graduated slide rail 27 to precisely adjust the cutting position. The force-bearing rod 22 has symmetrically arranged spiral fixing holes 220 on both longitudinal sides. The fixing bolts 29 pass through the spiral fixing holes 220 and are threadedly connected to the threaded holes on the cutting fixture 28. By tightening the fixing bolts 29, the cutting fixture 28 can be firmly fixed in the preset cutting position. The high-precision design of the graduated slide rail 27 enables the cutting thickness adjustment accuracy to reach the 0.1mm level, which is far higher than the accuracy of traditional manual cutting. The multiple fixing holes 220 provide more flexible fixing position selection, ensuring stable fixing under different cutting thicknesses and further guaranteeing the accuracy of the cutting dimensions.

[0036] In this embodiment, the cutting and forming device 2 further includes a blade head 2A, which is made of high-speed steel. The blade is specially ground to ensure sharpness and durability. The blade head 2A passes through the center of the cutting fixture 28. Pushing the blade head 2A allows the blade to cut the cylindrical plastic sample fixed in the cutting chamber 25 in a vertical direction. The cutting fixture 28 has symmetrical adjustment holes 280 at both ends. The adjustment holes 280 have internal threads. The device body 26 has an adjustment rod 281 rotatably mounted at a corresponding position. The external thread of the adjustment rod 281 matches the internal thread of the adjustment hole 280. The adjustment rod 281 passes through the adjustment hole 280 and is threadedly connected to the adjustment hole 280. By rotating the top knob of the adjustment rod 281 clockwise or counterclockwise, the cutting fixture 28 can be driven to move up and down in a vertical direction, thereby precisely adjusting the relative position between the blade head 2A and the sample. This dual-adjustment rod 281 structure makes the lifting and lowering of the cutting fixture 28 more stable, avoiding the tilting problem caused by unilateral adjustment. Combined with the guide sleeve design of the cutter head 2A, it ensures the perpendicularity of the cutting surface and greatly improves the precision control of sample thickness.

[0037] In this embodiment, the cutting surface of the blade 2A is further precision ground, with a flatness error of no more than 0.01 mm. The cutting surface is in close contact with the lower surface of the pressure plate 24 and the inner wall of the cutting chamber 25, and the gap between the contact parts is controlled within 0.02 mm. This structural design ensures that the blade is in complete contact with the sample surface during the cutting process, avoiding incomplete cutting or steps on the sample surface caused by gaps. This ensures that the parallelism error of the upper and lower surfaces of the cut plastic sample does not exceed 0.03 mm, and the surface roughness reaches Ra1.6 μm or higher, fully meeting the requirements of oxidation-induced test for sample surface quality. It also ensures uniform heat transfer during the test and improves the reliability of the test results.

[0038] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A plastic sample preparation molding apparatus, characterized by, It includes an impact forming device capable of producing sample diameter and a cutting forming device capable of producing sample thickness. Both the impact forming device and the cutting forming device can be disassembled independently. The two are used together to achieve precise forming of plastic sample diameter and thickness, which is suitable for the sample preparation requirements in oxidation induction time and oxidation induction temperature tests.

2. A plastic sample preparation molding apparatus according to claim 1, wherein The impact molding device includes a handle, a sample platform, a rotating assembly, an impact head, and a tamping rod. The sample platform is used to support the plastic raw material to be processed. The handle is connected to the rotating assembly. Pressing the handle can drive the rotating assembly to rotate and generate a downward impact force. The impact head is fixed below the rotating assembly. The impact force generated by the rotating assembly can drive the impact head to impact the plastic raw material on the sample platform to form a cylindrical plastic sample. The tamping rod is used to remove the impact-molded cylindrical plastic sample from the impact head or the sample platform.

3. A plastic sample preparation molding apparatus according to claim 2, wherein The impact forming device also includes a clamping ring, which is sleeved on the connection between the impact head and the rotating component. By adjusting the tightness of the clamping ring, the impact head and the rotating component can be detachably connected, making it easy to replace impact heads of different specifications.

4. The plastic sample preparation molding apparatus of claim 2, wherein, The impact head has multiple inner diameter specifications, and impact heads with different inner diameter specifications are used to form cylindrical plastic samples of different diameters to adapt to sample preparation scenarios with different diameter requirements in oxidation-induced testing.

5. The apparatus for preparing plastic samples according to claim 1, characterized in that, The cutting and forming device includes a fixed connector, a telescopic spring, a force-bearing rod, a lifting rod, a pressure plate, and a cutting chamber. The telescopic spring is sleeved between the fixed connector and the force-bearing rod to form a transmission structure that can elastically extend and retract. The lifting rod is fixedly connected to the pressure plate. Pulling the lifting rod can drive the pressure plate to move upward. After releasing the lifting rod, the pressure plate can press down under the elastic force of the telescopic spring to fix the cylindrical plastic sample to be cut in the cutting chamber.

6. A plastic sample preparation molding apparatus according to claim 5, wherein The cutting and forming device also includes a device body, a graduated slide rail, a cutting fixture, and fixing bolts. The graduated slide rail has millimeter-level scale markings on the device body for accurately indicating the cutting thickness. The cutting fixture is slidably connected to the graduated slide rail and can move along the length of the graduated slide rail to adjust the cutting position. The force-bearing rod has spiral fixing holes on both sides of its longitudinal direction. The fixing bolts pass through the spiral fixing holes and are threadedly connected to the cutting fixture to fix the cutting fixture in the preset cutting position.

7. A plastic sample preparation molding apparatus according to claim 6, wherein The cutting and forming device also includes a cutter head that passes through a cutting fixture and pushes the cutter head to cut the cylindrical plastic sample fixed in the cutting chamber. The cutting fixture has adjustment holes at both ends, and the device body is also rotatably equipped with an adjustment rod that passes through the adjustment hole and is threadedly connected to the adjustment hole. The up and down movement of the cutting fixture can be adjusted by rotating the adjustment rod.

8. A plastic sample preparation molding apparatus according to claim 7, wherein The cutting surface of the blade is in close contact with the lower surface of the pressure plate and the inner wall of the cutting chamber, and there are no gaps in the contact area, so as to ensure that the surface of the cut plastic sample is parallel, flat and burr-free.

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