Engineering plastic detection sample forming device

Abstract

An engineering plastic detection sample forming device comprises a lower mold, an upper mold is arranged above the lower mold, a plurality of connecting mechanisms are arranged between the lower mold and the upper mold, the connecting mechanisms are used for connecting and fixing the lower mold and the upper mold and adjusting the height of the upper mold, and preparation of samples with different thicknesses is facilitated through the adjusting mode. And the hot-melted plastic is shaped by the lower mold and the upper mold, so that the problem that micro cracks exist on the peripheral side of the sample, so that the test accuracy is influenced is solved.

Description

Technical Field

[0001] This utility model relates to the field of engineering plastics testing technology, and in particular to a sample forming device for engineering plastics testing. Background Technology

[0002] Engineering plastics are widely used in the automotive and other fields. During the research and development of engineering plastics, tests such as tensile strength and impact resistance are often conducted to determine their quality. For example, in tensile strength testing, samples are first formed and then cut to obtain samples suitable for testing. While this method can improve accuracy by taking multiple samples from the same sheet, it is prone to creating micro-cracks around the sample, affecting the accuracy of the test. Furthermore, the uncertainty in sample thickness also impacts the accuracy of the test. Utility Model Content

[0003] This invention provides a sample forming device for testing engineering plastics, which overcomes the shortcomings of the prior art and solves the problem of poor testing accuracy caused by the current sample preparation method, and has strong practicality.

[0004] In order to achieve the purpose of this utility model, the following technology is proposed to be adopted:

[0005] A sample forming device for engineering plastic testing includes a lower mold and an upper mold located above it. Multiple connecting mechanisms are provided between the lower and upper molds for connecting and fixing the lower and upper molds and for adjusting the height of the upper mold. This adjustment method facilitates the preparation of samples of different thicknesses. Furthermore, the method of shaping the hot-melt plastic using the lower and upper molds avoids the problem of micro-cracks on the periphery of the sample, which could affect the accuracy of the test.

[0006] Furthermore, the lower mold includes a lower shell with a cooling groove formed at the upper opening. Through holes are formed at both ends of the lower shell, with the inner ends of the through holes communicating with the cooling groove. Multiple support rods are provided on the lower shell, and a cover plate is sealed to the upper end of the lower shell. A central rectangular groove is formed in the downward recess of the cover plate, and end rectangular grooves are formed at both ends of the central rectangular groove. The width of the end rectangular grooves is greater than the width of the central rectangular groove. The cooling groove allows for rapid sample shaping during the shaping process. The central rectangular groove and the end rectangular grooves form a shaping groove, facilitating the installation and shaping of the sample into a predetermined shape.

[0007] Furthermore, a push rod is inserted through the end rectangular groove, and a top plate is provided at the upper end of the push rod. The top plate is located within the middle rectangular groove and the end rectangular groove, and the lower end of the push rod extends out from the lower end of the lower housing. After the sample is shaped, it can be pushed out of the forming groove through the top plate by pushing the push rod upward, thereby facilitating demolding.

[0008] Furthermore, to facilitate the upward lifting operation of the sample via the top plate, a lower moving plate is provided at the lower end of the top rod. A pair of side plates are formed on the lower moving plate, and oblique holes are opened on the side plates. There is an angle between the length direction of the oblique holes and the horizontal direction. A moving hole is opened on the lower moving plate, and a lower extension arm passes through the moving hole. A moving rod is provided at the lower end of the lower extension arm. The moving rod moves within the oblique hole. A concave part is provided at the upper end of the lower extension arm. Limit screws are connected to both ends of the concave part by thread. Guide grooves are opened on both sides of the lower housing, and the limit screws pass through the guide grooves.

[0009] Furthermore, to facilitate demolding, a pair of hinge shafts are welded to both sides of the lower shell. A rotating top plate is rotatably mounted on the hinge shaft. The inner end of the rotating top plate has an arc-shaped structure and abuts against the concave part to allow the concave part to move.

[0010] Furthermore, the upper mold includes an upper plate, the lower wall of which is formed with an inner extension. The outer shape of the inner extension matches the structure of the middle rectangular groove and the end rectangular groove, and the inner extension passes through the middle rectangular groove and the end rectangular groove. By controlling the length of the inner extension extending into the forming groove, the thickness of the sample can be controlled, thereby expanding the scope of application.

[0011] Furthermore, the inner extension is provided with vent holes, which facilitates the expulsion of air during the injection of hot melt plastic, thereby preventing the presence of air pores in the sample and affecting the sample quality.

[0012] Furthermore, in order to facilitate the injection of hot melt plastic and to reduce air bubbles during injection, an upper extension post is formed at the geometric center of the upper plate. A first hole is formed at the upper end of the upper extension post, and a first conical hole is connected to the lower end of the first hole. The lower end of the first conical hole is the smaller end, and a second hole is connected to the lower end of the first conical hole. A second conical hole is connected to the lower end of the second hole. The lower end of the second conical hole is the smaller end, and the lower end of the second conical hole penetrates the lower wall of the inner extension.

[0013] Furthermore, the connecting mechanism includes a vertical rod passing through the upper plate, with a pair of limiting nuts threaded onto the vertical rod. The limiting nuts are located on the upper and lower sides of the upper plate. Extending support plates are provided at the four corners of the cover plate, and movable sleeves are fitted onto the extending support plates. Limiting plates are provided on the movable sleeves, and U-shaped grooves are opened on the inner ends of the limiting plates. The vertical rod passes through the U-shaped grooves. This connecting mechanism facilitates the connection between the upper and lower molds.

[0014] The advantages of the above technical solution are:

[0015] This invention facilitates sample forming and demolding, and also makes it convenient to prepare samples of different thicknesses. Attached Figure Description

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will provide a more detailed description of this utility model in conjunction with the accompanying drawings.

[0017] Figure 1 A three-dimensional structure of one embodiment is shown. Figure 1 .

[0018] Figure 2 A magnified view of point A is shown.

[0019] Figure 3 A three-dimensional structure of one embodiment is shown. Figure 2 .

[0020] Figure 4 A three-dimensional structural diagram of the lower mold is shown.

[0021] Figure 5 The three-dimensional structure of the upper mold is shown. Figure 1 .

[0022] Figure 6 The three-dimensional structure of the upper mold is shown. Figure 2 . Detailed Implementation

[0023] like Figures 1-6 As shown, an engineering plastic testing sample forming device includes a lower mold 1, an upper mold 2 above the lower mold 1, and a plurality of connecting mechanisms 3 between the lower mold 1 and the upper mold 2. The connecting mechanisms 3 are used for connecting and fixing the lower mold 1 and the upper mold 2 and for adjusting the height of the upper mold 2.

[0024] The lower mold 1 includes a lower housing 10. A cooling groove is formed at the upper opening of the lower housing 10. Through holes 13 are formed at both ends of the lower housing 10. The inner ends of the through holes 13 are connected to the cooling groove. Multiple support rods 16 are provided on the lower housing 10. A cover plate 14 is sealed to the upper end of the lower housing 10. A central rectangular groove 11 is formed in the downward recess of the cover plate 14. End rectangular grooves 12 are formed at both ends of the central rectangular groove 11. The width of the end rectangular grooves 12 is greater than the width of the central rectangular groove 11.

[0025] The upper mold 2 includes an upper plate 20. An inner extension 21 is formed on the lower wall of the upper plate 20. The outer shape of the inner extension 21 matches the structure of the middle rectangular groove 11 and the end rectangular groove 12, and the inner extension 21 passes through the middle rectangular groove 11 and the end rectangular groove 12. A vent hole 28 is provided on the inner extension 21. An upper extension post 23 is formed at the geometric center of the upper plate 20. A first hole 24 is formed at the upper end of the upper extension post 23. The lower end of the first hole 24 connects to a first conical hole 25, the lower end of which is the smaller end. The lower end of the first conical hole 25 connects to a second hole 26, and the lower end of the second hole 26 connects to a second conical hole 27, the lower end of which is the smaller end, and the lower end of the second conical hole 27 penetrates through the lower wall of the inner extension 21.

[0026] The connecting mechanism 3 includes a vertical rod 30 passing through the upper plate 20. The lower end of the vertical rod 30 is provided with a chuck, which is located above the upper plate 20. A pair of limiting nuts 31 are threadedly connected to the vertical rod 30. The limiting nuts 31 are located on the upper and lower sides of the upper plate 20. The cover plate 14 is provided with an extended support plate 15 at the four corners. A movable sleeve 32 is fitted on the extended support plate 15. A limiting plate 33 is provided on the movable sleeve 32. A U-shaped groove 34 is opened on the inner end of the limiting plate 33. The vertical rod 30 passes through the U-shaped groove 34, and the chuck is located below the limiting plate 33.

[0027] In this embodiment, during operation, the operator adjusts the positions of the limiting nut 31 and the cover plate 14 on the vertical rod 30 according to the predetermined thickness of the sample. After adjustment, the operator inserts the lower end of the vertical rod 30 into the upper plate 20. At this time, the inner extension 21 passes through the middle rectangular groove 11 and the end rectangular groove 12 to a certain depth. Then, the limiting plate 33 is moved inward, and the vertical rod 30 is inserted into the U-shaped groove 34, thus forming a connection between the lower mold 1 and the upper mold 2. Then, the hot-melt plastic is injected into the middle rectangular groove 11 and the end rectangular groove 12 through the first hole 24. During the injection process, the air in the forming cavity is discharged through the vent hole 28 until the hot-melt plastic fills the second hole 26. At this point, the filling stops, and coolant is injected into the cooling tank. When the coolant passes through, it can carry away a large amount of heat, thereby quickly achieving the shaping of the plastic. Then, the connecting mechanism 3 disconnects the lower mold 1 and the upper mold 2, and the upper mold 2 is removed. Finally, the sample is taken out.

[0028] In some embodiments, a push rod 40 is provided through the end rectangular groove 12, and a top plate 41 is provided at the upper end of the push rod 40. The top plate 41 is located within the middle rectangular groove 11 and the end rectangular groove 12. The lower end of the push rod 40 extends out of the lower end of the lower housing 10. A lower moving plate 42 is provided at the lower end of the push rod 40. A pair of side plates 43 are formed on the lower moving plate 42. An oblique hole 44 is provided on the side plate 43. There is an angle between the length direction of the oblique hole 44 and the horizontal direction. A moving hole is provided on the lower moving plate 42. A lower extension arm 46 is provided through the moving hole. A moving rod 45 is provided at the lower end of the lower extension arm 46. The moving rod 45 moves within the oblique hole 44. A concave member 47 is provided at the upper end of the lower extension arm 46. Limiting screws 48 are threadedly connected to both ends of the concave member 47. Guide grooves are provided on both sides of the lower housing 10. The limiting screws 48 are inserted into the guide grooves. A pair of hinge shafts 49 are welded to both sides of the lower housing 10. A rotating top plate 50 is rotatably mounted on the hinge shafts 49. The inner end of the rotating top plate 50 has an arc-shaped structure and abuts against the concave part 47 to allow the concave part 47 to move.

[0029] During demolding, the operator can rotate the rotating top plate 50 located at one end using the mechanism provided in this embodiment. When the rotating top plate 50 rotates, it will push the concave part 47 to move. The movement of the concave part 47 will drive the moving rod 45 to move. When the moving rod 45 moves, it will act on the inclined hole 44, thereby causing the lower moving plate 42 to move upward and drive the top plate 41 connected to it to move upward, and eject the sample. After ejection, the top plate 41 is located at the bottom of the forming groove by another pair of rotating top plates 50, so as to facilitate the injection molding of the sample again.

[0030] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations of this utility model fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A sample forming device for testing engineering plastics, characterized in that, It includes a lower mold (1), an upper mold (2) is provided above the lower mold (1), and multiple connecting mechanisms (3) are provided between the lower mold (1) and the upper mold (2). The connecting mechanisms (3) are used to connect and fix the lower mold (1) and the upper mold (2) and to adjust the height of the upper mold (2).

2. The engineering plastic testing sample forming device according to claim 1, characterized in that, The lower mold (1) includes a lower shell (10), the upper end of the lower shell (10) has a cooling groove formed, the two ends of the lower shell (10) are provided with through holes (13), the inner end of the through hole (13) is connected to the cooling groove, and multiple support rods (16) are provided on the lower shell (10). The upper end of the lower housing (10) is sealed with a cover plate (14). The cover plate (14) is recessed downwards and formed with a central rectangular groove (11). The two ends of the central rectangular groove (11) are respectively formed with end rectangular grooves (12). The width of the end rectangular groove (12) is greater than the width of the central rectangular groove (11).

3. The engineering plastic testing sample forming device according to claim 2, characterized in that, A top rod (40) is provided on the end rectangular groove (12). The top plate (41) is provided at the upper end of the top rod (40). The top plate (41) is located in the middle rectangular groove (11) and the end rectangular groove (12). The lower end of the top rod (40) extends out of the lower end of the lower housing (10).

4. The engineering plastic testing sample forming device according to claim 3, characterized in that, The lower end of the push rod (40) is provided with a lower moving plate (42), and a pair of side plates (43) are formed on the lower moving plate (42). An oblique hole (44) is provided on the side plate (43). There is an angle between the length direction of the oblique hole (44) and the horizontal direction. A moving hole is provided on the lower moving plate (42). A lower extension arm (46) is inserted through the moving hole. A moving rod (45) is provided at the lower end of the lower extension arm (46). The moving rod (45) moves in the oblique hole (44). A concave part (47) is provided at the upper end of the lower extension arm (46). The two ends of the concave part (47) are connected by a limit screw (48) through a thread. Guide grooves are provided on both sides of the lower housing (10). The limit screw (48) is inserted in the guide groove.

5. The engineering plastic testing sample forming device according to claim 4, characterized in that, A pair of hinge shafts (49) are welded to both sides of the lower housing (10). A rotating top plate (50) is rotatably mounted on the hinge shaft (49). The inner end of the rotating top plate (50) has an arc-shaped structure. The inner end of the rotating top plate (50) abuts against the concave part (47) so that the concave part (47) can move.

6. The engineering plastic testing sample forming device according to claim 2, characterized in that, The upper mold (2) includes an upper plate (20), and the lower wall of the upper plate (20) is formed with an inner extension (21). The outer shape of the inner extension (21) matches the structure of the middle rectangular groove (11) and the end rectangular groove (12), and the inner extension (21) passes through the middle rectangular groove (11) and the end rectangular groove (12).

7. The engineering plastic testing sample forming device according to claim 6, characterized in that, Ventilation holes (28) are provided on the inner extension (21).

8. The engineering plastic testing sample forming device according to claim 6, characterized in that, An upper extension post (23) is formed at the geometric center of the upper plate (20). A first hole (24) is formed at the upper end of the upper extension post (23). A first conical hole (25) is connected to the lower end of the first hole (24). The lower end of the first conical hole (25) is the small end. A second hole (26) is connected to the lower end of the first conical hole (25). A second conical hole (27) is connected to the lower end of the second hole (26). The lower end of the second conical hole (27) is the small end, and the lower end of the second conical hole (27) penetrates the lower wall of the inner extension (21).

9. The engineering plastic testing sample forming device according to claim 6, characterized in that, The connecting mechanism (3) includes a vertical rod (30) passing through the upper plate (20). A pair of limiting nuts (31) are threadedly connected to the vertical rod (30). The limiting nuts (31) are located on the upper and lower sides of the upper plate (20). There are extended support plates (15) at the four corners of the cover plate (14). A movable sleeve (32) is fitted on the extended support plate (15). A limiting plate (33) is provided on the movable sleeve (32). A U-shaped groove (34) is opened on the inner end of the limiting plate (33). The vertical rod (30) passes through the U-shaped groove (34).

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