Sampling device for dynamic testing of rheometer

Abstract

The utility model discloses a sampling device for dynamic testing of a rheometer, and belongs to the field of sampling tools. The sampling device for the dynamic test of the rheometer comprises a first tong head arm, a second tong head arm and a material pushing mechanism which can be opened and closed, a sampling die is arranged on the first tong head arm, a flat tong mouth opposite to the sampling die is arranged on the second tong head arm, and the material pushing mechanism comprises an ejector pin, an elastic reset piece and a material pushing plate. The material pushing plate is located in a mold cavity of the sampling mold, the ejector pin is fixedly connected with the material pushing plate and penetrates out of the bottom of the sampling mold, and the elastic reset piece acts on the ejector pin and is used for making the material pushing plate keep the elastic trend of being located at the bottom of the mold cavity. According to the utility model, the material pushing mechanism is arranged on the sampling mold, and after the sampling mold is filled with materials and is pressed and formed, the formed sample is pushed out by the material pushing plate by utilizing the pressing of the external ejector pin, so that the operation of taking out the formed sample is greatly facilitated, and the sampling convenience and efficiency of the rheological test are improved.

Description

Technical Field

[0001] This utility model relates to a sampling tool, and more specifically, to a sampling device for dynamic testing of a rheometer. Background Technology

[0002] A thermoplastic torque rheometer is an important instrument used to guide the formulation development and product quality testing of heat stabilizers. It precisely controls temperature, rotation speed, and pressure within the mixing chamber to simulate the dynamic rheological behavior of materials after melting and plasticizing. To test the dynamic thermal stability of materials such as PVC, a small sample of plasticized material needs to be taken from the rheometer chamber for color testing to observe the formulation's thermal stability. The results of the product's dynamic thermal stability must also be presented to the customer.

[0003] To facilitate sampling of plasticizers, the applicant filed a patent application on October 12, 2016, with patent number CN201621117911.3 and invention title "A Sampling Pliers for Dynamic Rheological Testing of Calcium-Zinc Stabilizers," which was granted on May 24, 2017. This sampling pliers is a modified flat-nose pliers, comprising a first clamp body and a second clamp body capable of rotating around a pivot. The second clamp body has a sampling section at the end of its jaws, which is a semi-closed structure with an open top, and the sampling direction is along the clamping direction of the jaws. The top edge of the sampling section has a cutting edge. The end of the first clamp body's jaws has a flat surface that mates with the sampling section. This patent application filled a market gap for sampling tools suitable for the aforementioned rheological testing; however, in actual use, the following defects were found:

[0004] 1. After sampling, because the material is compressed inside the sampling cavity, and the sample material is small in size, there are problems such as difficulty in taking it out and laborious operation.

[0005] 2. Because the flat pliers' jaws are designed to not fit the sampling area perfectly, there are scraps on the outside that need to be trimmed with scissors, which is time-consuming and laborious.

[0006] 3. The sampling part is made of cast iron, which has poor corrosion resistance and is prone to rust. During the sampling process, it comes into contact with plasticizers, and rust on the surface of the material will affect the color test results.

[0007] 4. The sample material is cylindrical in shape and needs to be glued to the card for color comparison. Due to the small size of the sample material, the adhesive adhesion is weak and it is easy to fall off. In addition, glue is easy to overflow. Summary of the Invention

[0008] 1. Technical problem to be solved by the utility model

[0009] The purpose of this invention is to overcome the shortcomings of existing rheological testing sampling clamps, such as difficulties in material removal, and to provide a sampling device for dynamic testing of rheometers. The technical solution of this invention involves setting a pushing mechanism on the sampling mold. After the sampling mold is filled with material and pressed into shape, the sample is pushed out by the pushing plate using external ejector pins. This greatly facilitates the removal of the formed sample and improves the convenience and efficiency of rheological testing sampling. Furthermore, the raised structure design of the pushing plate creates a concave adhesive groove at the bottom of the sample, preventing adhesive overflow during sample bonding and ensuring convenient and strong bonding.

[0010] 2. Technical Solution

[0011] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0012] This utility model discloses a sampling device for dynamic testing of a rheometer, comprising a first jaw arm and a second jaw arm capable of opening and closing. The first jaw arm has a sampling mold, and the second jaw arm has a flat jaw disposed opposite to the sampling mold. It also includes a pushing mechanism, which comprises a pusher pin, an elastic reset member, and a pushing plate. The pushing plate is located inside the mold cavity of the sampling mold. The pusher pin is fixedly connected to the pushing plate and extends from the bottom of the sampling mold. The elastic reset member acts on the pusher pin to keep the pushing plate in an elastic position at the bottom of the mold cavity.

[0013] Furthermore, the pusher plate has a raised structure at the bottom of the mold cavity to form a mold cavity with a concave bottom.

[0014] Furthermore, the size of the pusher plate is smaller than the size of the bottom of the mold cavity, and the outer periphery of the pusher plate has a conical surface.

[0015] Furthermore, the elastic reset element is a compression spring, and a limiting plate is provided at the end of the ejector pin away from the pusher plate. The compression spring is sleeved on the outside of the ejector pin, with one end of the compression spring abutting against the limiting plate and the other end abutting against the first clamp arm.

[0016] Furthermore, the ejector pin and the pusher plate, as well as the ejector pin and the limiting plate, are all connected by threads.

[0017] Furthermore, the top opening of the sampling mold is provided with a chamfer, and a cutting edge that matches the flat pliers is formed on the top of the sampling mold; the root of the flat pliers has a bent portion so that the flat pliers have an inclined plane that fits tightly with the aforementioned cutting edge.

[0018] Furthermore, the sampling mold is made of stainless steel and is welded and fixed to the first clamp arm.

[0019] Furthermore, the sampling mold has a circular structure, and the inner wall of the mold cavity is provided with a demolding slope.

[0020] Furthermore, the first and second jaw arms are hinged together, with a first jaw handle at the rear end of the first jaw arm and a second jaw handle at the rear end of the second jaw arm.

[0021] Furthermore, a handle spring is provided between the first and second handles.

[0022] 3. Beneficial effects

[0023] Compared with existing known technologies, the technical solution provided by this utility model has the following beneficial effects:

[0024] (1) A sampling device for dynamic testing of a rheometer according to the present invention includes a first jaw arm, a second jaw arm and a pushing mechanism that can open and close. The first jaw arm has a sampling mold, and the second jaw arm has a flat jaw that is arranged opposite to the sampling mold. The pushing mechanism includes a push pin, an elastic reset member and a pushing plate. The pushing plate is located in the mold cavity of the sampling mold. The push pin is fixedly connected to the pushing plate and extends from the bottom of the sampling mold. The elastic reset member acts on the push pin to keep the pushing plate in an elastic tendency at the bottom of the mold cavity. By setting the pushing mechanism on the sampling mold, after the sampling mold is filled with material and pressed into shape, the pushing plate pushes out the formed sample by the pressing of the external push pin, which greatly facilitates the sample removal operation after forming and improves the convenience and efficiency of rheological testing sampling.

[0025] (2) The sampling device for dynamic testing of rheometer of this utility model has a pusher plate with a raised structure at the bottom of the mold cavity to form a mold cavity with a concave bottom. Through the raised structure design of the pusher plate, a concave glue groove can be formed at the bottom of the sample, so that the glue is not easy to overflow when the sample is bonded, and the bonding is convenient and firm.

[0026] (3) The sampling device for dynamic testing of rheometer of this utility model has a pusher plate with a size smaller than the bottom size of the mold cavity, and the outer periphery of the pusher plate has a conical surface. The conical surface design can facilitate the separation of the pusher plate from the sample, and further facilitate the demolding and removal of the sample.

[0027] (4) The sampling device for dynamic testing of rheometer of this utility model has a compression spring as its elastic reset component. A limiting plate is provided at the end of the ejector pin away from the pusher plate. The compression spring is sleeved on the outside of the ejector pin, and one end of the compression spring abuts against the limiting plate and the other end abuts against the first clamp arm. The compression spring is simple in structure, easy to manufacture, and provides stable and reliable reset of the pusher plate.

[0028] (5) The sampling device for dynamic testing of rheometer of this utility model has threaded connections between the ejector pin and the pusher plate and between the ejector pin and the limiting plate, which can facilitate the disassembly and replacement of the pusher mechanism.

[0029] (6) The sampling device for dynamic testing of a rheometer of the present invention has a chamfered top opening end of the sampling mold, and a blade that matches the flat jaw is formed at the top of the sampling mold; the root of the flat jaw has a bent part so that the flat jaw has an inclined plane that fits tightly with the blade; the tight fit between the inclined plane and the blade can form a shearing action to cut off the overflowing edge material without additional trimming operation, which further improves the sampling efficiency and safety.

[0030] (7) The sampling device for dynamic testing of rheometer of this utility model has a sampling mold made of stainless steel and the sampling mold is welded and fixed on the first clamp arm. The sampling material will not be contaminated by the rust of the mold, thus ensuring the accuracy of the test.

[0031] (8) A sampling device for dynamic testing of a rheometer according to the present invention has a first jaw arm and a second jaw arm hinged together. A first jaw handle is provided at the rear end of the first jaw arm and a second jaw handle is provided at the rear end of the second jaw arm. A jaw handle spring is also provided between the first jaw handle and the second jaw handle. The jaw handle spring can facilitate the opening of the jaws, further improving the ease of operation and flexibility. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the sampling device for dynamic testing of a rheometer according to the present invention;

[0033] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0034] Figure 3 This is a schematic diagram of the closed-state structure of a sampling device for dynamic testing of a rheometer according to the present invention;

[0035] Figure 4 This is a schematic diagram of the cooperation structure between the material pushing mechanism and the sampling mold in this utility model;

[0036] Figure 5 This is a schematic diagram showing the state of the pushing mechanism pushing the sample outward in this utility model;

[0037] Figure 6 This is a schematic diagram showing the sample and sampling mold in the demolding and separation state in this utility model.

[0038] Explanation of the labels in the diagram:

[0039] 1. First jaw arm; 1-1. First jaw handle; 1-2. Sampling mold; 1-2a. Mold cavity; 1-2b. Beveled chamfer; 1-2c. Cutting edge; 2. Second jaw arm; 2-1. Second jaw handle; 2-2. Flat jaw; 2-2a. Bending part; 3. Pushing mechanism; 3-1. Ejector pin; 3-2. Elastic reset component; 3-3. Limiting plate; 3-4. Pushing plate; 3-4a. Conical surface; 4. Jaw spring; 5. Sample; 5-1. Glue tank. Detailed Implementation

[0040] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0041] [Example]

[0042] Combination Figure 1 and Figure 2 As shown, this embodiment of a sampling device for dynamic testing of a rheometer includes a first jaw arm 1 and a second jaw arm 2 capable of opening and closing. The first jaw arm 1 has a sampling mold 1-2, and the second jaw arm 2 has flat jaws 2-2 disposed opposite to the sampling mold 1-2. When the first jaw arm 1 and the second jaw arm 2 are open, plasticized material can be extracted using the sampling mold 1-2. When the first jaw arm 1 and the second jaw arm 2 are closed, the plasticized material is pressed into the sampling mold 1-2 using the flat jaws 2-2, and after compression, it is formed into a sample 5 of the desired shape and size. Unlike the prior art, the sampling device for dynamic testing of a rheometer in this embodiment also includes a pushing mechanism 3 for removing the sample 5 from the sampling mold 1-2. Figure 1 and Figure 2 As shown, the pushing mechanism 3 includes an ejector pin 3-1, an elastic reset member 3-2, and a pushing plate 3-4. The pushing plate 3-4 is located in the mold cavity 1-2a of the sampling mold 1-2. The ejector pin 3-1 is fixedly connected to the pushing plate 3-4, and the ejector pin 3-1 extends out from the bottom of the sampling mold 1-2. The elastic reset member 3-2 acts on the ejector pin 3-1 to keep the pushing plate 3-4 in an elastic tendency at the bottom of the mold cavity 1-2a. Initially, under the action of the elastic reset member 3-2, the pusher plate 3-4 remains at the bottom of the mold cavity 1-2a. After the sampling mold 1-2 takes a sample and presses it into shape, the pusher plate 3-4 is located at the bottom of the sample 5. At this time, pressing the protruding end of the ejector pin 3-1 drives the pusher plate 3-4 upward, thereby pushing the sample 5 out of the mold cavity 1-2a. After releasing the ejector pin 3-1, the pusher plate 3-4 returns to the bottom of the mold cavity 1-2a under the action of the elastic reset member 3-2. By setting the pusher mechanism 3 on the sampling mold 1-2, after the sampling mold 1-2 is filled with material and pressed into shape, the pusher plate 3-4 pushes out the formed sample by pressing the external ejector pin 3-1, which greatly facilitates the sample removal operation after forming and improves the convenience and efficiency of rheological testing sampling.

[0043] like Figure 2 As shown, in this embodiment, the pusher plate 3-4 has a convex structure at the bottom of the mold cavity 1-2a to form a mold cavity 1-2a with a concave bottom. Thus, referring to... Figure 6 As shown, a concave adhesive groove 5-1 can be formed at the bottom of sample 5, which prevents adhesive from overflowing during sample 5 bonding, making bonding convenient and firm. Specifically, the size of the push plate 3-4 is smaller than the size of the bottom of the mold cavity 1-2a, so that the push plate 3-4 is convex at the bottom of the mold cavity 1-2a. Preferably, the outer periphery of the push plate 3-4 has a conical surface 3-4a. The conical surface design facilitates the separation of the push plate 3-4 from the sample 5, further facilitating sample demolding. Furthermore, the above-mentioned elastic reset element 3-2 is a compression spring. The end of the ejector pin 3-1 away from the push plate 3-4 is provided with a limiting plate 3-3. The compression spring is sleeved on the outside of the ejector pin 3-1, with one end of the compression spring abutting against the limiting plate 3-3 and the other end abutting against the first clamp arm 1. The compression spring applies a downward elastic force to the ejector pin 3-1 and the push plate 3-4. The use of a compression spring results in a simple structure, convenient manufacturing, and stable and reliable reset of the push plate 3-4. To facilitate the replacement of the pusher plate 3-4, threaded connections are preferably used between the ejector pin 3-1 and the pusher plate 3-4, and between the ejector pin 3-1 and the limiting plate 3-3. Specifically, external threads can be provided at both ends of the ejector pin 3-1, and corresponding internal threads can be provided on the pusher plate 3-4 and the limiting plate 3-3. The ejector pin 3-1 is fixed by tightening the threads of the pusher plate 3-4 and the limiting plate 3-3, which facilitates the disassembly and replacement of the pusher mechanism 3.

[0044] catch Figure 1 and Figure 2 As shown, in this embodiment, the top opening of the sampling mold 1-2 is provided with a chamfer 1-2b. The chamfer 1-2b reduces the wall thickness of the top of the sampling mold 1-2, thereby forming a cutting edge 1-2c on the top of the sampling mold 1-2 that mates with the flat jaw 2-2. To ensure the compatibility between the flat jaw 2-2 and the cutting edge 1-2c, a bent portion 2-2a is provided at the root of the flat jaw 2-2, so that the flat jaw 2-2 has an inclined plane that closely fits the cutting edge 1-2c. Figure 3 As shown, through the bending design of the flat jaw 2-2, when the first jaw arm 1 and the second jaw arm 2 are closed, the inclined plane of the flat jaw 2-2 can fit tightly and completely against the cutting edge 1-2c. The tight fit between the inclined plane and the cutting edge 1-2c can form a shearing action to cut off the overflowing edge material without the need for additional trimming operations, effectively eliminating the safety hazards caused by the trimming process, and further improving sampling efficiency and safety.

[0045] Furthermore, in this embodiment, the sampling mold 1-2 is made of stainless steel and is welded and fixed to the first clamp arm 1. Compared with existing cast iron molds, the sampled material will not be contaminated by mold rust, ensuring the accuracy of the test. In addition, the sampling mold 1-2 is preferably a ring-shaped structure, and the inner wall of the mold cavity 1-2a is provided with a demolding slope, so that the produced sample 5 has a flat circular button structure.

[0046] like Figure 1 and Figure 3 As shown, for convenient sampling, the first jaw arm 1 and the second jaw arm 2 are hinged together. A first handle 1-1 is provided at the rear end of the first jaw arm 1, and a second handle 2-1 is provided at the rear end of the second jaw arm 2. The opening or closing of the first jaw arm 1 and the second jaw arm 2 can be controlled by operating the first handle 1-1 and the second handle 2-1. A handle spring 4 is also provided between the first handle 1-1 and the second handle 2-1. The handle spring 4 facilitates the opening of the jaws, so that when the handle is released, the first jaw arm 1 and the second jaw arm 2 can open naturally, making it easy to remove the sample 5 from the sampling mold 1-2, further improving the convenience and flexibility of operation.

[0047] Figures 4 to 6 The process of sample 5 from forming to removal is shown. For example... Figure 4 As shown, when the plastic material is pressed and shaped by the flat jaws 2-2 within the sampling mold 1-2, the sharp blade 1-2c at the top of the sampling mold 1-2 can cut off excess plastic material, allowing the plastic material to fill the mold cavity 1-2a of the sampling mold 1-2, thus forming the desired sample 5. Figure 5 As shown, after the plasticized material is formed, pressing the limiting plate 3-3 causes the pusher plate 3-4 to push the sample 5 upward, causing the sample 5 to be ejected from the mold cavity 1-2a. Figure 6 As shown, after sample 5 is taken out, due to the raised structure of the pusher plate 3-4, a concave glue-containing groove 5-1 can be formed at the bottom of sample 5. After applying glue in the glue-containing groove 5-1, it can be bonded to the card, as shown in the experimental report.

[0048] This utility model discloses a sampling device for dynamic testing of a rheometer. By setting a pushing mechanism on the sampling mold, after the sampling mold is filled with material and pressed into shape, the sample is pushed out by the pushing plate using the pressure of the external ejector pin. This greatly facilitates the removal of the formed sample and improves the convenience and efficiency of rheological testing sampling. In addition, the raised structure design of the pushing plate can form a concave adhesive groove at the bottom of the sample, which prevents adhesive from overflowing during sample bonding, making bonding convenient and firm.

[0049] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A sampling device for dynamic testing of a rheometer, comprising a first jaw arm (1) and a second jaw arm (2) capable of opening and closing, wherein the first jaw arm (1) has a sampling mold (1-2), and the second jaw arm (2) has a flat jaw (2-2) disposed opposite to the sampling mold (1-2), characterized in that: It also includes a pushing mechanism (3), which includes an ejector pin (3-1), an elastic reset member (3-2), and a pushing plate (3-4). The pushing plate (3-4) is located in the mold cavity (1-2a) of the sampling mold (1-2). The ejector pin (3-1) is fixedly connected to the pushing plate (3-4), and the ejector pin (3-1) protrudes from the bottom of the sampling mold (1-2). The elastic reset member (3-2) acts on the ejector pin (3-1) to keep the pushing plate (3-4) in an elastic tendency at the bottom of the mold cavity (1-2a).

2. The sampling device for dynamic testing of a rheometer according to claim 1, characterized in that: The pusher plate (3-4) has a raised structure at the bottom of the mold cavity (1-2a) to form a mold cavity (1-2a) with a concave bottom.

3. The sampling device for dynamic testing of a rheometer according to claim 2, characterized in that: The size of the pusher plate (3-4) is smaller than the size of the bottom of the mold cavity (1-2a), and the outer periphery of the pusher plate (3-4) has a conical surface (3-4a).

4. The sampling device for dynamic testing of a rheometer according to claim 1, 2, or 3, characterized in that: The elastic reset component (3-2) is a compression spring. The end of the ejector pin (3-1) away from the pusher plate (3-4) is provided with a limiting plate (3-3). The compression spring is sleeved on the outside of the ejector pin (3-1), and one end of the compression spring abuts against the limiting plate (3-3), while the other end abuts against the first clamp arm (1).

5. The sampling device for dynamic testing of a rheometer according to claim 4, characterized in that: The ejector pin (3-1) and the pusher plate (3-4), as well as the ejector pin (3-1) and the limiting plate (3-3), are all connected by threads.

6. The sampling device for dynamic testing of a rheometer according to claim 1, 2, or 3, characterized in that: The top opening of the sampling mold (1-2) is provided with a chamfer (1-2b), and a cutting edge (1-2c) is formed on the top of the sampling mold (1-2) to cooperate with the flat jaw (2-2); the root of the flat jaw (2-2) has a bent part (2-2a) so that the flat jaw (2-2) has an inclined plane that closely fits the cutting edge (1-2c).

7. The sampling device for dynamic testing of a rheometer according to claim 6, characterized in that: The sampling mold (1-2) is made of stainless steel and is welded and fixed on the first clamp arm (1).

8. The sampling device for dynamic testing of a rheometer according to claim 7, characterized in that: The sampling mold (1-2) has a circular structure, and the inner wall of the mold cavity (1-2a) is provided with a demolding slope.

9. The sampling device for dynamic testing of a rheometer according to claim 1, 2, or 3, characterized in that: The first plier arm (1) and the second plier arm (2) are hinged together. A first plier handle (1-1) is provided at the rear end of the first plier arm (1), and a second plier handle (2-1) is provided at the rear end of the second plier arm (2).

10. The sampling device for dynamic testing of a rheometer according to claim 9, characterized in that: A handle spring (4) is also provided between the first handle (1-1) and the second handle (2-1).

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