Tabletting die demolding device

Abstract

This utility model discloses a demolding device for a pressing mold, including a pressure screw, a hollow demolding screw, and a screw support. The screw support includes a base, on which a hollow demolding screw support nut bracket and a pressure screw support nut bracket are fixedly installed. The hollow demolding screw is threadedly connected to the nut hole on the hollow demolding screw support nut bracket, and a pressure screw is threadedly connected to the nut hole on the pressure screw support nut bracket. A cylindrical cavity is formed in the center of the hollow demolding screw, through which the pressure screw passes. This demolding device for a pressing mold significantly reduces cracking damage to the ceramic blank after demolding. It has good demolding effects for both experiments with and without adhesive powder. The demolded blanks have high consistency and few defects, providing accurate and reliable performance evaluation of the sintered ceramic powder. Furthermore, it greatly improves the demolding success rate, efficiently obtaining high-quality blanks.

Description

Technical Field

[0001] This utility model relates to the field of demolding technology for blank block pressing molds, and in particular to a demolding device for pressing molds. Background Technology

[0002] The performance evaluation of ceramic oxide powder materials generally requires pressing them into green blocks of a certain thickness, sintering them, and then evaluating the relevant mechanical properties of the sintered blocks. When pressing the blocks, a tablet press and a tablet mold are used. When the powder is put into the tablet mold, the tablet mold is put into the tablet press. After being pressed into a block with a certain strength under a certain pressure, the most critical demolding step begins.

[0003] like Figure 1 As shown, the pressing mold 4 includes a base support 4-1, a top pressure rod 4-2, a cylindrical hollow mold sleeve 4-3, and a pad block 4-4. The base support is used to support the lower pad block and facilitate its removal during demolding. The top pressure rod is used to press the upper pad block and extrude the green body during demolding. The pad block has a polished surface, which can give the ceramic green body a smooth surface after molding.

[0004] During demolding, the base support of the pressing mold needs to be removed, and then the pressing mold is placed upside down on the pressing machine. The green blank block and the spacer block in the pressing mold are pushed out together by rotating the screw, and the ceramic green blank block is taken out for subsequent sintering and related performance testing. Therefore, the quality of the final ceramic green blank block after demolding directly affects the subsequent sintering and performance testing.

[0005] However, when demolding traditional tableting molds, the mold is placed upside down into the tableting machine, and the pressure of the tableting machine pushes out the pad and ceramic blank in the mold. This causes the lower surface of the ceramic blank to be subjected to greater force than the upper surface during demolding. The friction force is unevenly distributed on the side of the ceramic blank. If the strength of the blank is particularly low, or if the strength is inconsistent at different positions of the inverted block due to uneven distribution of the pressed powder, the vibration of the side friction force is enough to break the blank into two halves or cause serious edge cracks and damage when it is demolded.

[0006] Furthermore, most tablet pressing molds are made of stainless steel. Due to prolonged use, the surface becomes increasingly rough from friction with the ceramic blank, making demolding more and more difficult. Using traditional demolding methods results in a progressively worse quality of the ceramic blank after demolding. To obtain better blank quality, repeated pressing is necessary, which wastes the time and energy of R&D personnel and hinders more efficient research activities. While applying anti-rust grease to the inner wall of the tablet pressing mold can improve and solve these problems, it will greatly increase the material and time costs of tablet pressing. Moreover, the adhesion of grease can cause the pads in the tablet pressing mold to easily slip to the ground when being removed, resulting in damage to the smooth surface of the pads and shortening their service life. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model designs a tablet mold demolding device.

[0008] The present invention adopts the following technical solution:

[0009] A tablet compression mold demolding device includes a pressure screw, a hollow demolding screw, and a screw support. The screw support includes a base, on which a hollow demolding screw support nut bracket and a pressure screw support nut bracket are fixedly installed. The hollow demolding screw is threadedly connected to the nut hole on the hollow demolding screw support nut bracket, and a pressure screw is threadedly connected to the nut hole on the pressure screw support nut bracket. A cylindrical cavity is formed at the center of the hollow demolding screw, through which the pressure screw passes.

[0010] Preferably, the pressure screw includes a screw handle, a solid screw, and a turntable. The solid screw is fixedly connected to the center of the bottom of the turntable, and a screw handle is fixedly connected to one side of the turntable. The solid screw is threadedly connected to the nut hole on the pressure screw support nut bracket.

[0011] Preferably, the hollow demolding screw is provided with an outer ring thread, which is threaded to the nut hole on the hollow demolding screw support nut bracket.

[0012] Preferably, the hollow demolding screw is provided with a screw handle at its upper end.

[0013] Preferably, there are four screw handles, which are symmetrically distributed at 90 degrees on the outer side of the upper end of the hollow demolding screw.

[0014] Preferably, the lower end of the hollow demolding screw is provided with an annular retaining protrusion.

[0015] Preferably, the diameter of the cylindrical cavity is larger than the diameter of the blank in the tableting mold. This facilitates the blank entering the cylindrical cavity during extrusion by the hollow demolding screw.

[0016] Preferably, the nut hole on the hollow demolding screw support nut bracket is coaxially arranged with the nut hole on the pressure screw support nut bracket.

[0017] The beneficial effects of this utility model are as follows: This utility model designs a demolding device for pressing molds, which greatly reduces the cracking damage of ceramic blanks after demolding. It has a good demolding effect for both adding adhesive powder and ordinary experiments without adding adhesive powder. The demolded blanks have high consistency and few defects, and the performance evaluation of sintered ceramic powder is accurate and reliable. It also greatly improves the demolding success rate and efficiently obtains high-quality blanks. Attached Figure Description

[0018] Figure 1This is a schematic diagram of a conventional tableting mold.

[0019] Figure 2 This is a schematic diagram of the structure of this utility model;

[0020] Figure 3 yes Figure 2 A schematic diagram of a type of pressure screw;

[0021] Figure 4 yes Figure 2 A schematic diagram of a hollow demolding screw;

[0022] Figure 5 yes Figure 2 A schematic diagram of a type of screw support structure;

[0023] Figure 6 This is a schematic diagram of the structure of this utility model during demolding;

[0024] In the diagram: 1. Pressure screw, 2. Hollow demolding screw, 3. Screw support, 4. Pressing mold, 1-1. Tightening handle, 1-2. Solid screw, 1-3. Turntable, 2-1. Tightening handle, 2-2. Cylindrical cavity, 2-3. Outer thread, 2-4. Annular locking protrusion, 3-1. Hollow demolding screw support nut frame, 3-2. Pressure screw support nut frame, 3-3. Base, 4-1. Base support, 4-2. Top pressure rod, 4-3. Columnar hollow mold sleeve, 4-4. Pad block. Detailed Implementation

[0025] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0026] Example: Figure 2 As shown, a tablet mold demolding device includes a pressure screw 1, a hollow demolding screw 2, and a screw support 3. Figure 5 As shown, the screw support includes a base 3-3, on which a hollow demolding screw support nut bracket 3-1 and a pressure screw support nut bracket 3-2 are fixedly installed. A hollow demolding screw is threaded into the nut hole of the hollow demolding screw support nut bracket, and a pressure screw is threaded into the nut hole of the pressure screw support nut bracket. A cylindrical cavity 2-2 is opened in the center of the hollow demolding screw, and the pressure screw passes through the cylindrical cavity.

[0027] like Figure 3 As shown, the pressure screw includes a screw handle 1-1, a solid screw 1-2, and a turntable 1-3. The solid screw is fixedly connected to the center of the bottom of the turntable, and a screw handle is fixedly connected to one side of the turntable. The solid screw is threadedly connected to the nut hole on the pressure screw support nut bracket.

[0028] likeFigure 4 As shown, the hollow demolding screw is provided with an outer ring thread 2-3, which is threaded to the nut hole on the hollow demolding screw support nut bracket.

[0029] The upper end of the hollow demolding screw is equipped with four screw handles 2-1, which are symmetrically distributed at 90 degrees on the outer side of the upper end of the hollow demolding screw.

[0030] The lower end of the hollow demolding screw is equipped with an annular retaining protrusion 2-4. The diameter of the cylindrical cavity is larger than the diameter of the blank in the tableting mold. This facilitates the blank entering the cylindrical cavity during the extrusion of the hollow demolding screw.

[0031] The nut hole on the hollow demolding screw support nut bracket is coaxially set with the nut hole on the pressure screw support nut bracket.

[0032] like Figure 6 As shown, when using this invention, when pressing ceramic powder into ceramic blanks using a tablet press and a tablet mold, the base support 4-1 is removed, and the tablet mold is inverted and placed on a cuboid base. First, the pressure screw is rotated down by turning the handle to appropriately press the pad block 4-4 in the tablet mold. This ensures that the ceramic blank has sufficient resistance to the damage caused by surface friction and vibration during demolding. Then, the hollow demolding screw is rotated by turning the handle to move downwards and press against the hollow mold sleeve 4-3. The hollow demolding screw is continued to be rotated until the ceramic blank is completely exposed. Finally, the pressure screw is rotated to move upwards and the demolded ceramic blank is taken out, thus completing the demolding operation of this device.

[0033] The present invention provides a demolding device for pressing molds, which improves the quality of pressed ceramic blanks, reduces repetitive labor, increases work efficiency, and improves the accuracy of ceramic powder evaluation.

[0034] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A tablet compression mold demolding device, characterized in that, It includes a pressure screw, a hollow demolding screw, and a screw bracket. The screw bracket includes a base, on which a hollow demolding screw support nut bracket and a pressure screw support nut bracket are fixedly installed. The hollow demolding screw is threaded into the nut hole of the hollow demolding screw support nut bracket, and the pressure screw is threaded into the nut hole of the pressure screw support nut bracket. A cylindrical cavity is opened in the center of the hollow demolding screw, and the pressure screw passes through the cylindrical cavity.

2. The tableting mold demolding device according to claim 1, characterized in that, The pressure screw includes a screw handle, a solid screw, and a turntable. The solid screw is fixedly connected to the center of the bottom of the turntable, and a screw handle is fixedly connected to one side of the turntable. The solid screw is threadedly connected to the nut hole on the pressure screw support nut bracket.

3. The tableting mold demolding device according to claim 1, characterized in that, The hollow demolding screw is provided with an outer ring thread, which is threaded to the nut hole on the hollow demolding screw support nut bracket.

4. The tableting mold demolding device according to claim 1, characterized in that, The hollow demolding screw is equipped with a screw handle at its upper end.

5. The tableting mold demolding device according to claim 4, characterized in that, There are four screw handles, which are symmetrically distributed at 90 degrees on the outer side of the upper end of the hollow demolding screw.

6. The tableting mold demolding device according to claim 1, characterized in that, The lower end of the hollow demolding screw is provided with an annular retaining protrusion.

7. The tableting mold demolding device according to claim 1, characterized in that, The diameter of the cylindrical cavity is larger than the diameter of the blank in the tableting mold.

8. The tableting mold demolding device according to claim 1, characterized in that, The nut hole on the hollow demolding screw support nut frame is coaxially arranged with the nut hole on the pressure screw support nut frame.

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