Tabletting die

Abstract

The utility model provides a tabletting die. The tabletting die comprises an upper die, a cathode block and a lower die, when the tabletting mold is under the tabletting configuration, the cathode block is arranged at the tabletting position, and the pressing head can penetrate through the tabletting hole of the cathode block to abut against the tabletting plane; when the tabletting mold is in the demolding configuration, the cathode block is arranged at the demolding position, and the pressing head can penetrate through the tabletting hole of the cathode block to extend into the demolding groove. The tabletting mold disclosed by the utility model is suitable for glow discharge mass spectrometry detection of conductor powder samples and non-conductor powder samples, and can be used for conveniently demolding and recovering the powder samples.

Description

Technical Field

[0001] The utility model relates to a tablet pressing mould, in particular to a tablet pressing mould which is used for glow discharge mass spectrometry detection equipment and can conveniently demould and recycle samples. Background Art

[0002] Glow discharge mass spectrometry (GDMS) detection equipment, such as the GDMS double-focusing high-resolution mass spectrometer, has the advantages of low detection limit, wide linear range, and simultaneous determination of multiple elements. It has a wide range of applications in analyzing high-purity metals, semiconductors, ceramics and other materials. Specifically, for materials that are difficult to dissolve, such as precious metals rhodium and iridium, the solid sampling form of the glow discharge mass spectrometry detection equipment provides a solution for their purity analysis. The sample to be tested for the glow discharge mass spectrometry detection equipment is usually in the form of a conductive solid, and the test sample has at least one flat surface. In actual use, if the sample to be tested is in powder form, it is necessary to first use a press to press the sample powder into a tablet. However, when the amount of sample powder is small or the viscosity is low, tableting may be difficult, making it impossible to detect on the machine. In addition, when the sample powder is not conductive, even if a tablet is obtained, it cannot be directly tested on the machine.

[0003] For the technical problem of the difficulty of pressing powder into tablets mentioned above, the common solution in the prior art is to use special aluminum cups and / or introduce graphite, but this will introduce additional pollution, making sample recovery and demolding difficult. In addition, when the sample powder is a non-conductor, Patent Application No. 201821904675.9 proposes a device for non-conductor powder for glow discharge mass spectrometry detection. However, the non-conductor powder device also has the problem of sample recovery and demolding difficulties. Therefore, practitioners always hope to continuously improve glow discharge mass spectrometry detection and the equipment used for this purpose. Utility Model Content

[0004] In order to solve the problem of difficulty in demoulding and recycling powder samples in the glow discharge mass spectrometry (GDMS) detection process in the prior art, the purpose of the utility model is to provide a tablet pressing mold that can solve the above problem. The tablet pressing mold is suitable for glow discharge mass spectrometry detection of conductive powder samples and non-conductive powder samples, and can easily demould and recycle powder samples.

[0005] To this end, the utility model provides a tablet pressing mold, comprising:

[0006] An upper die, comprising a pressing head and a pressing head rod arranged above the pressing head;

[0007] A cathode block, made of a conductive material, comprising a pressing plate hole passing through the cathode block, wherein the cross-sectional dimension of the pressing plate hole corresponds to the cross-sectional dimension of the pressing head;

[0008] A lower mold, comprising a tableting position and a demolding position, wherein the tableting position comprises at least one tableting plane for tableting, and the demolding position comprises a demolding groove for receiving a sample, wherein the cross-sectional dimension of the demolding groove is smaller than the cross-sectional dimension of the cathode block;

[0009] Wherein, when the tablet pressing mold is in the tablet pressing configuration, the cathode block is arranged at the tablet pressing position of the lower mold, and the pressing head can pass through the tablet pressing hole of the cathode block and rest on the tablet pressing plane; when the tablet pressing mold is in the demolding configuration, the cathode block is arranged at the demolding position of the lower mold, and the pressing head can pass through the tablet pressing hole of the cathode block and extend into the demolding groove.

[0010] The tableting mold of the utility model can realize tableting, detection and demolding of powder samples, and is suitable for conductive powders and non-conductive powders. More specifically, the use of the tableting mold of the utility model can be divided into a tableting stage, a detection stage and a demolding stage. In the tableting stage, the tableting mold is in a tableting configuration, and the powder sample to be tested is first filled into the tableting hole in the cathode block, and then the press drives the upper mold to press down, driving the pressure head to extend into the tableting hole to tablet the powder sample in the tableting hole. In the subsequent detection stage, the pressure head is first pulled out, and then the lower mold and the cathode block with the sample tablet in the tableting hole are loaded onto the detection equipment for glow discharge detection. At this time, since the cathode block acts as an auxiliary electrode, even if the sample tablet itself has no conductivity, the glow discharge detection can be carried out normally. In the final demoulding stage, the cathode block (with sample tablets) is first moved and / or the lower mold is turned over so that the tablet mold is in the demoulding configuration. Then the press drives the upper mold to press down again, driving the pressure head to extend into the demoulding groove, so that the tablets fall into the demoulding groove to achieve demoulding. In this way, complete and uncontaminated sample tablets can be recovered in the demoulding groove to reduce waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The advantages and features of the present invention will now be described in detail with reference to the accompanying drawings, in which the components are not necessarily drawn to scale, wherein:

[0012] Figure 1 The exploded view of one embodiment of a tablet pressing mold of the present invention is schematically shown, wherein the tablet pressing mold is in a tablet pressing configuration, wherein the lower mold is shown in a perspective form to show the details of its interior.

[0013] Figure 2 Schematically shows Figure 1 An exploded view of a tabletting die is shown in the demolded configuration with the lower die shown in perspective to show details of its interior.

[0014] Figure 3The exploded view of another embodiment of the tablet pressing mold of the present invention is schematically shown, wherein the tablet pressing mold is in a tablet pressing configuration, wherein the lower mold is shown in a perspective form to show the details of its interior.

[0015] Figure 4 Schematically shows Figure 3 An exploded view of a tabletting die is shown in the demolded configuration with the lower die shown in perspective to show details of its interior. DETAILED DESCRIPTION

[0016] In this specification, the terms "above, below, and cross section" are used in conjunction with Figure 2 The orientation shown is divided as a reference. The "cross-sectional dimensions of the tablet pressing hole correspond to the cross-sectional dimensions of the pressing head" mentioned in this specification means that the tablet pressing hole and the pressing head can form a gap or overfit, so that tablet pressing can be achieved when the pressing head can be directly withdrawn.

[0017] The utility model provides a tablet pressing mold, comprising:

[0018] An upper die, comprising a pressing head and a pressing head rod arranged above the pressing head;

[0019] A cathode block, made of a conductive material, comprising a pressing plate hole passing through the cathode block, wherein the cross-sectional dimension of the pressing plate hole corresponds to the cross-sectional dimension of the pressing head;

[0020] A lower mold, comprising a tableting position and a demolding position, wherein the tableting position comprises at least one tableting plane for tableting, and the demolding position comprises a demolding groove for receiving a sample, wherein the cross-sectional dimension of the demolding groove is smaller than the cross-sectional dimension of the cathode block;

[0021] Wherein, when the tablet pressing mold is in the tablet pressing configuration, the cathode block is arranged at the tablet pressing position of the lower mold, and the pressing head can pass through the tablet pressing hole of the cathode block and rest on the tablet pressing plane; when the tablet pressing mold is in the demolding configuration, the cathode block is arranged at the demolding position of the lower mold, and the pressing head can pass through the tablet pressing hole of the cathode block and extend into the demolding groove.

[0022] In a preferred embodiment of the tableting mold of the utility model, the tableting position and the demoulding position are coaxially arranged on opposite sides of the lower mold. In this way, the conversion from the tableting configuration to the demoulding configuration can be achieved by turning the lower mold 180 degrees. This design of the tableting position and the demoulding position being arranged relative to each other greatly reduces the volume of the lower mold.

[0023] In a preferred embodiment of the tabletting mold of the utility model, the tabletting position and the demoulding position are arranged in parallel on the same side of the lower mold. In this way, when the tabletting mold needs to be changed from the tabletting position to the demoulding position, the lower mold position can remain unchanged, and the operation is simple. Further preferably, the tabletting mold also includes a recovery block, which is in the form of a hollow piece with a top opening and can be spliced ​​into a whole with the lower mold, and the top opening of the recovery block is communicated with the demoulding groove so that the demoulded sample can fall into the recovery block. In this way, after the demoulding is completed, the operator can directly recover the sample tablet by releasing the splicing of the recovery block, so that the operation is more simplified.

[0024] In a preferred embodiment of the tablet pressing mold of the utility model, the demoulding position further includes a cathode groove, the cathode groove is arranged above the demoulding groove, and the cross-sectional dimension of the cathode groove is greater than or equal to the cross-sectional dimension of the cathode block. The demoulding groove configuration enables the cathode block to be accommodated and limited during the demoulding process, making the operation convenient.

[0025] In a preferred embodiment of the tablet pressing mold of the utility model, the tablet pressing hole of the cathode block and the demoulding groove for receiving the sample included in the demoulding position of the lower mold are similar in shape, for example, both are cylindrical, and the cross-sectional size of the demoulding groove is equal to or slightly larger than the cross-sectional size of the tablet pressing hole of the cathode block. In this way, it can be ensured that the sample tablet can smoothly enter the demoulding groove from the tablet pressing hole without causing waste due to excessive cross-sectional size.

[0026] It can be understood that when the tablet pressing mold is in the tablet pressing configuration, the tablet pressing positions of the upper mold, the cathode block and the lower mold are in a concentric state; when the tablet pressing mold is in the demolding configuration, the demolding positions of the upper mold, the cathode block and the lower mold are in a concentric state.

[0027] In a preferred embodiment of the tableting mold of the utility model, the upper mold is in the form of a stepped shaft, and the diameter of the press rod is greater than the diameter of the press head. Wherein, for example, the diameter of the press rod can be between 20 mm and 30 mm, and the diameter of the press head can be between 3 mm and 6 mm. More preferably, the cathode block is in the form of a cylinder, and the tableting hole is arranged at the center of the cathode block. Even more preferably, the length of the press head is at least 2 mm greater than the sum of the height of the cathode block and the depth of the demolding groove. In this way, during demolding, even if the press head is pressed down to the limit, the lower surface of the press head can still have a gap of at least 2 mm from the bottom surface of the demolding groove, avoiding the lower surface of the press head from colliding with the bottom surface of the demolding groove, and providing space for sample tableting after demolding. In addition, the small size of the press head (3 mm to 6 mm) greatly saves the amount of sample powder. For example, when rhodium is subjected to glow discharge mass spectrometry detection, the tablet pressing mold of the present invention only requires about 0.5 g of sample, which is a significant decrease compared to the amount of at least 5 g used in the prior art (using a special aluminum cup and / or introducing graphite).

[0028] In a preferred embodiment of the tablet pressing mold of the utility model, each component of the tablet pressing mold is made of niobium metal. In this way, no impurity metal will be introduced during the entire use of the tablet pressing mold. In addition, since the entire tablet pressing mold is made of niobium metal, all surfaces in contact with the sample tablet are conductive, so that glow discharge mass spectrometry can be performed more accurately on non-conductive powders. More preferably, the cathode block is made of niobium metal with a purity of more than 99.999%, and the content of a single impurity element (such as lithium, boron, sodium, magnesium, aluminum, silicon, calcium, titanium, vanadium, chlorine, manganese, iron, nickel, copper, zinc, etc.) is not more than 0.05ug / g.

[0029] The various components of the tablet pressing mold of the utility model can be made of metal materials and processed and formed by machining, casting, stamping, bending and other methods.

[0030] In one embodiment, the tableting position and the demoulding position of the lower die of the tableting die of the utility model are coaxially arranged on opposite sides. For this tableting die, in the conversion process from the tableting position to the demoulding position, the lower die needs to be flipped 180 degrees. On this basis, the utility model also provides the following preferred embodiments.

[0031] In a preferred embodiment, the tableting position and the demoulding position of the lower mold of the tableting mold of the utility model are arranged side by side on the same side. It is possible to achieve the conversion from the tableting position to the demoulding position by only moving the cathode block, and the operation is simple. In addition, in the preferred embodiment, the tableting mold also includes a recovery block. After demoulding, the operator does not need to separate the upper and lower molds, and only needs to release the splicing of the recovery block to directly recover the sample tablet, which is simpler to operate.

[0032] The following is a description of the specific embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to these specific embodiments. In the illustrated embodiments, the upper mold, cathode block, lower mold, recovery block, etc. are made of metal. However, it is understood that they can be made of other materials as long as they are suitable for detection needs.

[0033] Figure 1 Schematically shows an exploded view of an embodiment of a tabletting die of the present invention, wherein the tabletting die is in a tabletting configuration, wherein the lower die is shown in perspective to show the details of its interior. Figure 1 As shown, the tableting mold as a whole is represented by reference symbol 100. The tableting mold 100 includes: an upper mold 101, a cathode block 102 and a lower mold 103. Among them, the upper mold 101 is in the form of a stepped shaft, including a pressure head 101A with a smaller diameter and a pressure head rod 101B with a larger diameter. The cathode block 102 is in the form of a cylinder, including a tableting hole 102A arranged in the center. The diameter of the pressure head 101A corresponds to the inner diameter of the tableting hole 102A. The lower mold 103 is in the form of a cylinder, including a tableting position 103A arranged on one end face and a demolding position 103B arranged on the other end face. Among them, the tableting position 103A acts as a tableting plane on the end face of the cylinder. In the tableting configuration, the tableting position 103A faces upward, and the upper mold 101, the cathode block 102, and the lower mold 103 are concentric. The pressing head 101A can move toward the tableting plane through the tableting hole 102A under the drive of the pressing machine to achieve tableting.

[0034] Figure 2 Schematically shows Figure 1 An exploded view of a tabletting die is shown in the demolding configuration, with the lower die shown in perspective to show the details of its interior. Figure 1 As shown, in the tableting configuration, the demoulding position 103B faces upward, and the upper mold 101, the cathode block 102, and the lower mold 103 are concentric. The demoulding position 103B includes a demoulding groove 103B-1 and a cathode groove 103B-2 disposed above the demoulding groove 103B-1 and concentric with the demoulding groove 103B-1. During the demoulding process, the cathode block 102 is disposed in the cathode groove 103B-2, and the pressing head 101A, driven by the press, passes through the tableting hole 102A and extends into the demoulding groove 103B-1 to achieve demoulding.

[0035] Figure 3 Schematically shows an exploded view of another embodiment of the tabletting mold of the present invention, the tabletting mold is in a tabletting configuration, wherein the lower mold is shown in a perspective form to show the details of its interior. Figure 3 As shown, the tablet pressing mold is indicated by reference symbol 100' as a whole. Figure 3 The tabletting mold 100′ shown is Figure 1The tablet pressing mold 100 shown in the figure is different in that it includes a recovery block 104', and the tablet pressing position 103'A and the demoulding position 103'B are arranged on the same end surface of the lower mold 103'. Figure 3 As shown, the tablet pressing position 103'A is in a plane form and is a part of the end surface of the lower mold 103'. The upper mold 101' and the cathode block 102' are arranged above the tablet pressing position 103'A.

[0036] Figure 4 Schematically shows Figure 3 An exploded view of a tabletting die is shown in the demolding configuration, with the lower die shown in perspective to show the details of its interior. Figure 4 As shown, the recovery block 104' is in the form of a hollow part with an opening at the top, and can be assembled into a whole with the lower mold 103', and the upper mold 101' and the cathode block 102' are arranged above the demoulding position 103'A. The top opening of the recovery block 104' is connected to the demoulding groove 103'B-1, so that the demoulded sample can fall into the recovery block 104'.

Claims

1. A tabletting die, characterized in that: include: An upper die, comprising a pressing head and a pressing head rod arranged above the pressing head; A cathode block, made of a conductive material, comprising a pressing plate hole passing through the cathode block, wherein the cross-sectional dimension of the pressing plate hole corresponds to the cross-sectional dimension of the pressing head; A lower mold, comprising a tableting position and a demolding position, wherein the tableting position comprises at least one tableting plane for tableting, and the demolding position comprises a demolding groove for receiving a sample, wherein the cross-sectional dimension of the demolding groove is smaller than the cross-sectional dimension of the cathode block; Wherein, when the tablet pressing mold is in the tablet pressing configuration, the cathode block is arranged at the tablet pressing position of the lower mold, and the pressing head can pass through the tablet pressing hole of the cathode block and rest on the tablet pressing plane; when the tablet pressing mold is in the demolding configuration, the cathode block is arranged at the demolding position of the lower mold, and the pressing head can pass through the tablet pressing hole of the cathode block and extend into the demolding groove.

2. The tabletting mold according to claim 1, characterized in that: The tablet pressing position and the demolding position are coaxially arranged on opposite sides of the lower mold.

3. The tabletting mold according to claim 1, characterized in that: The tablet pressing position and the demoulding position are arranged in parallel on the same side of the lower mold.

4. The tabletting die according to claim 3, characterized in that: It also includes a recovery block, which is in the form of a hollow piece with a top opening and can be assembled with the lower mold into a whole. The top opening of the recovery block is connected to the demoulding groove, so that the demoulded sample can fall into the recovery block.

5. The tabletting die according to any one of claims 1 to 3, characterized in that: The demoulding position further includes a cathode slot, which is arranged above the demoulding slot, and a cross-sectional dimension of the cathode slot is greater than or equal to a cross-sectional dimension of the cathode block.

6. The tabletting die according to any one of claims 1 to 3, characterized in that: The upper die is in the form of a stepped shaft, and the diameter of the pressure head rod is greater than the diameter of the pressure head.

7. The tablet pressing mold according to claim 6, characterized in that: The cathode block is in the form of a cylinder, and the pressing plate hole is arranged at the center of the cathode block.

8. The tabletting die according to claim 7, characterized in that: The length of the press head is at least 2 mm greater than the sum of the height of the cathode block and the depth of the demoulding groove.

9. The tabletting die according to any one of claims 1 to 3, characterized in that: When the tablet pressing mold is in the tablet pressing configuration, the tablet pressing positions of the upper mold, the cathode block and the lower mold are in a concentric state; when the tablet pressing mold is in the demolding configuration, the upper mold, the cathode block and the lower mold are in a concentric state.

10. The tabletting die according to any one of claims 1 to 3, characterized in that: The pressing hole of the cathode block and the demoulding groove for receiving the sample included in the lower mold demoulding position have the same shape, and the cross-sectional dimension of the demoulding groove is greater than or equal to the cross-sectional dimension of the pressing hole of the cathode block.

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