A polyurethane compression sample casting device

Abstract

The invention discloses a polyurethane compression specimen casting device, comprising: a positioning groove is provided on the upper surface of a positioning plate, a material leakage hole is provided in the positioning groove, and the material leakage hole penetrates the positioning plate; the left cavity comprises: a left end portion and a left comb tooth; the right cavity comprises: a right end portion and a right comb tooth; the demoulding rod is a rod-shaped structure; wherein the left cavity and the right cavity are both placed in the positioning groove, each right comb tooth is arranged between two adjacent left comb teeth, the left cavity and the right cavity are both operable to move in the positioning groove, the demoulding rod can operably penetrate the left forming hole and the right forming hole, and the demoulding rod can operably penetrate the material leakage hole. The cylindrical compression specimen made by the invention can eliminate air bubbles and flash defects, and the test data of the compression test is accurate.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane compression sample casting devices, in particular to a polyurethane compression sample casting device. Background Art

[0002] When designing products using different polyurethane elastomer materials, designers need to understand the compressive stress-compressive strain relationship of the selected polyurethane elastomer material. The compressive stress-compressive strain relationship of the polyurethane elastomer material is obtained by preparing compression specimens for testing. Standard polyurethane elastomer compression specimens are short cylinders, which are generally made by direct casting and / or machining. The compression specimens made by casting in an open mold need to remove the gate end by machining. The closed mold is to pour liquid polyurethane raw materials into the open mold cavity, cover it with a flat mold cover and press it with the cavity to form a closed molding space. The products cast in this way will produce bubbles on the side in contact with the mold cover. Due to the very high elongation of polyurethane, it is difficult to obtain a smooth processing surface by machining, and due to the small size of the standard compression specimen and the high elasticity of the polyurethane material, it is difficult to clamp on the cutting machine. Therefore, the compressive stress-compressive strain relationship of the polyurethane elastomer material obtained by testing the compression specimens prepared by the prior art is inaccurate, which affects the product design. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a polyurethane compression sample casting device.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A polyurethane compression sample casting device, comprising:

[0006] A positioning plate, wherein a positioning groove is formed on the upper surface of the positioning plate, a material leakage hole is formed in the positioning groove, and the material leakage hole penetrates the positioning plate;

[0007] A left cavity, the left cavity comprising: a left end portion and left comb teeth, the left end portion being connected to a plurality of left comb teeth, each of the left comb teeth being provided with a left forming hole, the plurality of left forming holes being coaxially arranged, the plurality of left forming holes being of the same size, and a first distance being provided between every two adjacent left comb teeth;

[0008] A right cavity, the right cavity comprising: a right end portion and right comb teeth, the right end portion being connected to a plurality of right comb teeth, each of the right comb teeth being provided with a right forming hole, the plurality of right forming holes being coaxially arranged, the plurality of right forming holes being of the same size, the plurality of right forming holes being of the same size as the left forming hole, and a second distance being provided between every two adjacent right comb teeth;

[0009] Ejector rod;

[0010] Among them, the left cavity and the right cavity are both placed in the positioning groove, each of the right comb teeth is arranged between two adjacent left comb teeth, the left cavity and the right cavity are both operably movable in the positioning groove, the demolding rod is operably penetrated through the left forming hole and the right forming hole, and the demolding rod is operably penetrated through the leakage hole.

[0011] The above-mentioned polyurethane compression sample casting device, among which, further includes: supporting feet, wherein two supporting feet are respectively connected to the two ends of the positioning plate, the supporting feet are perpendicular to the positioning plate, and the supporting feet are arranged on the lower surface of the positioning plate.

[0012] The above-mentioned polyurethane compression sample casting device further includes: a handle, and each of the supporting legs is equipped with a handle.

[0013] The above-mentioned polyurethane compression sample casting device, wherein the length of the left comb teeth is equal to the length of the right comb teeth.

[0014] In the above-mentioned polyurethane compression specimen casting device, the distance from one end of the right cavity to the axis of the right molding hole is equal to the distance from one end of the positioning groove corresponding to the right cavity to the axis of the leakage hole.

[0015] In the above-mentioned polyurethane compression specimen casting device, the distance from one end of the left cavity to the axis of the left molding hole is smaller than the distance from one end of the positioning groove corresponding to the left cavity to the axis of the leakage hole.

[0016] In the above-mentioned polyurethane compression sample casting device, the width of the left comb teeth, the width of the right comb teeth and the width of the positioning groove are all equal.

[0017] The above-mentioned polyurethane compression sample casting device, wherein the sum of the length of the left end portion, the length of the right end portion and the length of the left comb teeth or the length of the right comb teeth is smaller than the length of the positioning groove.

[0018] Due to the adoption of the above technology, the present invention has the following positive effects compared with the prior art:

[0019] (1) The cylindrical compression specimen made by the present invention can eliminate air bubbles and flash defects, and the test data of the compression test is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of an explosion of a polyurethane compression sample casting device of the present invention.

[0021] Figure 2It is a cross-sectional schematic diagram of the polyurethane compression sample casting device of the present invention.

[0022] Figure 3 It is a schematic diagram of the state of the polyurethane compression sample casting device of the present invention.

[0023] Figure 4 It is a schematic diagram of state 2 of the polyurethane compression sample casting device of the present invention.

[0024] Figure 5 Schematic diagram of state three of the polyurethane compression specimen casting device of the present invention.

[0025] In the accompanying drawings: 1. positioning plate; 11. positioning groove; 12. leakage hole; 13. handle; 14. support foot; 2. left cavity; 21. left comb tooth; 22. left end; 23. left forming hole; 3. right cavity; 31. right comb tooth; 32. right end; 33. right forming hole; 4. demoulding rod. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention. Figure 1 It is an exploded schematic diagram of the polyurethane compression sample casting device of the present invention; Figure 2 is a schematic cross-sectional view of a polyurethane compression sample casting device of the present invention; Figure 3 It is a schematic diagram of the state of the polyurethane compression sample casting device of the present invention; Figure 4 It is a schematic diagram of state 2 of the polyurethane compression sample casting device of the present invention; Figure 5 3 is a schematic diagram of the state of the polyurethane compression sample casting device of the present invention, see Figures 1 to 5 As shown, a polyurethane compression sample casting device of a preferred embodiment is shown, comprising:

[0027] A positioning plate 1, wherein a positioning groove 11 is formed on the upper surface of the positioning plate 1, a material leakage hole 12 is formed in the positioning groove 11, and the material leakage hole 12 penetrates the positioning plate 1;

[0028] The left cavity 2 comprises: a left end portion 22 and a left comb tooth 21, a plurality of left comb teeth 21 are connected to the left end portion 22, a left forming hole 23 is provided on each left comb tooth 21, the plurality of left forming holes 23 are coaxially arranged, the plurality of left forming holes 23 have the same size, and a first distance is provided between every two adjacent left comb teeth 21;

[0029] The right cavity 3, the right cavity 3 includes: a right end portion 32 and right comb teeth 31, several right comb teeth 31 are connected to the right end portion 32, a right forming hole 33 is formed on each right comb tooth 31, several right forming holes 33 are coaxially arranged, the sizes of several right forming holes 33 are the same, the sizes of several right forming holes 33 are the same as the size of the left forming hole 23, and there is a second distance between every two adjacent right comb teeth 31;

[0030] The demolding rod 4;

[0031] Wherein, the left cavity 2 and the right cavity 3 are both placed in the positioning groove 11, each right comb tooth 31 is arranged between two adjacent left comb teeth 21, the left cavity 2 and the right cavity 3 can be operably moved in the positioning groove 11, the demolding rod 4 can be operably penetrated through the left forming hole 23 and the right forming hole 33, and the demolding rod 4 can be operably penetrated through the material leakage hole 12.

[0032] In a preferred embodiment, the left comb tooth 21 and the adjacent right comb tooth 31 are matched, and the matching gap does not exceed 0.005 mm.

[0033] In a preferred embodiment, it further includes: supporting feet 14, the two supporting feet 14 are respectively connected to both ends of the positioning plate 1, the supporting feet 14 are perpendicular to the positioning plate 1, and the supporting feet 14 are arranged on the lower surface of the positioning plate 1.

[0034] In a preferred embodiment, the positioning plate 1 and the supporting feet 14 are in a "C" shape with the opening facing downwards.

[0035] In a preferred embodiment, it further includes: a handle 13, and a handle 13 is installed on each supporting foot 14.

[0036] The above is only a preferred embodiment of the present invention, and thus does not limit the implementation manners and protection scope of the present invention.

[0037] The present invention further has the following implementation manners on the above basis:

[0038] In a further embodiment of the present invention, the length of the left comb tooth 21 is equal to the length of the right comb tooth 31.

[0039] In a further embodiment of the present invention, the distance from one end of the right cavity 3 to the axis of the right forming hole 33 is equal to the distance from the corresponding end of the positioning groove 11 to the axis of the material leakage hole 12.

[0040] In a further embodiment of the present invention, the distance from one end of the left cavity 2 to the axis of the left forming hole 23 is less than the distance from the corresponding end of the positioning groove 11 to the axis of the material leakage hole 12.

[0041] In a further embodiment of the present invention, the widths of the left comb tooth 21, the right comb tooth 31 and the positioning groove 11 are all equal.

[0042] In a further embodiment of the present invention, the sum of the length of the left end portion 22 , the length of the right end portion 32 , and the length of the left comb teeth 21 or the length of the right comb teeth 31 is smaller than the length of the positioning groove 11 .

[0043] In a further embodiment of the present invention, a method for casting a polyurethane compression sample casting device is also included, comprising the following steps:

[0044] Step S1: Preheat the device to the molding temperature in the oven and then take it out, push the right cavity 3 to the left so that the left cavity 2 is close to the left end of the positioning groove 11 of the positioning plate 1. At this time, the left molding hole 23 and the right molding hole 33 are completely aligned to form a cylindrical cavity, and liquid polyurethane raw material is poured into the cylindrical cavity.

[0045] Step S2: Pull the right cavity 3 to the right so that the right cavity 3 is close to the right end of the positioning groove 11 of the positioning plate 1. The cylindrical cavity in step S1 is divided into a plurality of closed short cylindrical cavities, and the liquid polyurethane raw material is enclosed in these plurality of short cylindrical cavities; then put the device into an oven to solidify the polyurethane raw material.

[0046] Step S3: After the liquid polyurethane raw material is solidified, the device is taken out of the oven. The left cavity 2 is pushed rightward, so that the top surface of the comb teeth of the left cavity 2 fits with the bottom surface of the comb teeth of the right cavity 3, the forming holes of the left cavity 2, the forming holes of the right cavity 3 and the leakage holes 12 of the positioning plate 1 are aligned, and the obtained polyurethane compression sample is pressed out of the cavity from above with the demoulding rod 4, so as to obtain the polyurethane compression sample.

[0047] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A polyurethane compression sample casting device, characterized in that: include: A positioning plate, wherein a positioning groove is formed on the upper surface of the positioning plate, a material leakage hole is formed in the positioning groove, and the material leakage hole passes through the positioning plate; A left mold cavity, the left mold cavity comprising: a left end portion and left comb teeth, the left end portion being connected to a plurality of left comb teeth, each of the left comb teeth being provided with a left forming hole, the plurality of left forming holes being coaxially arranged, the plurality of left forming holes being of the same size, and a first distance being provided between every two adjacent left comb teeth; a right mold cavity, the right mold cavity comprising: a right end portion and right comb teeth, the right end portion being connected to a plurality of right comb teeth, each of the right comb teeth being provided with a right forming hole, the plurality of right forming holes being coaxially arranged, the plurality of right forming holes being of the same size, the plurality of right forming holes being of the same size as the left forming hole, and a second distance being provided between every two adjacent right comb teeth; demoulding rod; Among them, the left cavity and the right cavity are both placed in the positioning groove, each of the right comb teeth is arranged between two adjacent left comb teeth, the left cavity and the right cavity are both operably movable in the positioning groove, the demolding rod is operably passed through the left forming hole and the right forming hole, and the demolding rod is operably passed through the leakage hole.

2. The polyurethane compression sample casting device according to claim 1, characterized in that: Also includes: The two supporting feet are respectively connected to the two ends of the positioning plate, the supporting feet are perpendicular to the positioning plate, and the supporting feet are arranged on the lower surface of the positioning plate.

3. The polyurethane compression sample casting device according to claim 2, characterized in that: Also includes: A handle is installed on each of the supporting legs.

4. The polyurethane compression sample casting device according to claim 1, characterized in that: The length of the left comb teeth is equal to the length of the right comb teeth.

5. The polyurethane compression sample casting device according to claim 4, characterized in that: The distance from one end of the right cavity to the axis of the right forming hole is equal to the distance from one end of the positioning groove corresponding to the right cavity to the axis of the leakage hole.

6. The polyurethane compression sample casting device according to claim 5, characterized in that: The distance from one end of the left cavity to the axis of the left forming hole is smaller than the distance from one end of the positioning groove corresponding to the left cavity to the axis of the leakage hole.

7. The polyurethane compression specimen casting device according to claim 6, characterized in that: The width of the left comb teeth, the width of the right comb teeth and the width of the positioning groove are all equal.

8. The polyurethane compression specimen casting device according to claim 7, characterized in that: The sum of the length of the left end portion, the length of the right end portion, and the length of the left comb teeth or the length of the right comb teeth is smaller than the length of the positioning groove.

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