A powder tableting machine and its usage method

Abstract

This invention relates to the field of tablet presses, specifically to a powder tablet press and its usage method. The press includes a mold, a cavity, a bottom mold, and a top mold. The mold has an internal cavity, within which a matching bottom mold is slidably mounted. The top mold slidably covers the side of the mold furthest from the bottom mold. The advantage of this invention is that, when processing compressed powder, compared to traditional powder tablet presses where the top and bottom molds must be removed before ejecting the formed tablet using other equipment such as a cylinder, this invention directly uses a crank and connecting rod to continuously move the bottom mold repeatedly. The first movement of the bottom mold compresses the powder to form a tablet, and the second movement ejects the tablet, completing the discharge. The bottom mold moves twice to form a cycle, simplifying the powder tableting process, making operation more convenient, and significantly improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of tablet presses, and in particular to a powder tablet press and its usage method. Background Technology

[0002] A tablet compressor is a machine that compresses dry granular or powdered materials into tablets using a mold. With continuous advancements in science and technology, tablet compressors have also evolved and improved, leading to rapid development in tablet production and application. Tablets have become one of the most widely used drug dosage forms in clinical practice and hold an important position in pharmaceutical manufacturing worldwide. For tablet production, the tablet compressor is the most critical and important piece of equipment. However, existing traditional technologies are not comprehensive and have the following drawbacks:

[0003] Traditional powder tableting machines require removing the top and bottom molds before extruding the formed powder tablets using additional equipment such as cylinders. This process is outdated, cumbersome, complex, and inefficient. Summary of the Invention

[0004] This invention provides a powder tableting machine and its usage method to overcome the problems of outdated and cumbersome processing steps, complex operation, and low production efficiency of existing traditional powder tableting machines.

[0005] The present invention adopts the following technical solution: a powder tableting machine, comprising a mold, a cavity, a bottom mold, and a top mold. The mold has a cavity inside, and a matching bottom mold is slidably installed in the cavity. The top mold slidably covers the side of the mold away from the bottom mold. The machine also includes a tableting mechanism connected to the bottom mold. The tableting mechanism includes a connecting rod, a crank, a slide groove, a slider, a spring, and a rotating shaft. One end of the connecting rod is rotatably connected to the bottom mold, and the other end of the connecting rod is rotatably installed on the surface of the slider. The slider is slidably installed in the slide groove, which is located inside the crank. The spring is fixed in the slide groove, and both ends of the spring are respectively connected to the crank and the slider. The end of the crank away from the slider is rotatably installed on the outside of the rotating shaft.

[0006] As a further improvement, a dovetail tenon is provided on the side surface of the top mold near the cavity, and a dovetail groove adapted to the dovetail tenon is provided on the side surface of the mold near the top mold, and the dovetail tenon is slidably embedded in the dovetail groove.

[0007] As a further improvement, the top of the top mold is connected to a cylinder, which is mounted on a gantry frame, and the gantry frame is fixed to the upper surface of the worktable.

[0008] As a further improvement, limit blocks are fixed on both sides of the slider, and a limit groove adapted to the limit block is provided on the crank, and the limit block is slidably installed in the limit groove.

[0009] As a further improvement, a hanging ring is provided on the surface of the slider and the crank, and the two ends of the spring are hook-shaped, with the hooks at both ends of the spring hooking onto the hanging ring respectively.

[0010] As a further improvement, the mold is provided with a relief groove on one end near the bottom mold that is adapted to the connecting rod. The connecting rod is slidably disposed in the relief groove, and when the bottom mold is located on the rightmost side of the cavity, the left side of the bottom mold still covers the upper left of the relief groove.

[0011] A method of using a powder tableting machine, characterized by the following steps: First, a measured amount of powder is poured into the cavity through the feed inlet; Second, the motor is started, causing the crank and connecting rod to move continuously, while the bottom mold, driven by the crank and connecting rod, pushes the powder in the cavity to the surface of the top mold to begin extrusion; Third, after the powder in the cavity is basically formed, the bottom mold continues to extrude the powder. When the extrusion pressure exceeds the spring preload, the slider begins to move to compress the spring. At this time, the bottom mold remains stationary, continuously compressing the powder to form a pressure-holding state; Fourth, when the bottom mold... When the extrusion pressure on the powder begins to decrease, the spring begins to return to its original shape under the action of elastic restoring force, and then the bottom die returns, at which point the powder pressing is completed; in the fifth step, after the bottom die leaves the already formed powder pressing sheet, the top die moves upward to open the cavity opening; in the sixth step, the bottom die then approaches the already formed powder pressing sheet again and pushes the powder pressing sheet out of the cavity, completing the discharge; in the seventh step, when the bottom die returns after the discharge is completed, the top die moves downward to block the cavity opening again, and then the powder is poured in from the feed port, and the above operation is repeated to process the powder.

[0012] As can be seen from the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages: When processing extruded powder, compared with the traditional powder tableting machine, which requires the top and bottom molds to be moved out first and then another device such as a cylinder to eject the formed powder tablets, the bottom mold is directly driven to move repeatedly by the continuous movement of the crank and connecting rod. When the bottom mold moves for the first time, it compresses the powder to form a tablet. When the bottom mold moves for the second time, it ejects the tablet to complete the discharge. The bottom mold moves repeatedly twice to form a cycle, which makes the powder tableting process simpler, the operation more convenient, and greatly improves production efficiency. Attached Figure Description

[0013] Figure 1 This is a front view structural diagram of the present invention.

[0014] Figure 2 This is a three-dimensional structural diagram of the mold, bottom mold, top mold, and connecting rod.

[0015] Figure 3 This is a front view schematic diagram of the tablet compression mechanism.

[0016] Figure 4This is a schematic diagram of the three-dimensional structure of the crank.

[0017] Figure 5 This is a top view of the mold and top mold structure.

[0018] Figure 6 This is a schematic diagram of the structure for the first movement of the bottom die to extrude powder.

[0019] Figure 7 This is a schematic diagram of the spring compression structure during the first movement of the bottom mold.

[0020] Figure 8 This is a schematic diagram of the structure during the first return stroke of the bottom mold.

[0021] Figure 9 This is a schematic diagram of the structure for the second movement of the bottom mold to push out the powder tablet. Detailed Implementation

[0022] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0023] As attached Figures 1 to 9 As shown, a powder tableting machine includes a mold 2, a cavity 4, a bottom mold 5 and a top mold 6. The mold 2 has a cavity 4 inside, and the bottom mold 5 is slidably installed in the cavity 4. The top mold 6 slidably covers the side end face of the mold 2 away from the bottom mold 5.

[0024] As attached Figures 2 to 4 As shown, it also includes a pressing mechanism 7 connected to the bottom mold 5. The pressing mechanism 7 includes a connecting rod 71, a crank 72, a slide groove 73, a slider 74, a spring 75, and a rotating shaft 710. One end of the connecting rod 71 is rotatably connected to the bottom mold 5, and the other end of the connecting rod 71 is rotatably mounted on the surface of the slider 74. The slider 74 is slidably mounted in the slide groove 73, which is located inside the crank 72. The spring 75 is fixed in the slide groove 73, and both ends of the spring 75 are connected to the crank 72 and the slider 74, respectively. The end of the crank 72 away from the slider 74 is rotatably mounted on the outside of the rotating shaft 710. The rotating shaft 710 is connected to the motor shaft of the motor 76. The motor 76 is fixed to the upper surface of the mounting plate 77, which is mounted on the gantry frame 10. After the powder is fed, the motor 76 is started to continuously move the crank 72 and connecting rod 71, driving the bottom mold 5 to move along the cavity 4, pushing the powder in the cavity 4 to the surface of the top mold 6 to begin extrusion. When the extrusion force exceeds the preload of the spring 75 inside the crank 72, the slider 74 begins to move along the slide groove 73 to compress the spring 75, as detailed in the attached figure. Figure 7As shown, at this time, the bottom mold 5 remains stationary and continuously compresses the powder to form a pressure-holding state. When the extrusion pressure of the bottom mold 5 on the powder begins to decrease, the spring 75, under the action of elastic restoring force, begins to extend and push the slider 74 outward to return to its original shape. Then the bottom mold 5 returns, and the powder tableting is completed. The details are as shown in the attached figure. Figure 8 As shown, after the bottom mold 5 leaves the already formed powder tablet, the top mold 6 moves upward to open the cavity 4. Then, the bottom mold 5 approaches the already formed powder tablet again. At this time, the powder tablet, without the resistance of the top mold 6, can be smoothly pushed out of the cavity 4 by the bottom mold 5 and fall into the storage box 9 from the cavity opening, completing the discharge process. See attached diagram for details. Figure 9 As shown, when the bottom mold 5 returns after the discharge, the top mold 6 moves downward to block the cavity 4 again. Then, the powder is poured in from the feed port 3. This process is repeated to achieve batch processing. Compared with traditional powder tableting machines, which require the top mold 6 and bottom mold 5 to be removed first, and then other equipment such as cylinders to eject the formed powder tablets, the bottom mold 5 is driven to move repeatedly by the continuous movement of the crank 72 and connecting rod 71. When the bottom mold 5 moves for the first time, it compresses the powder to form a tablet. When the bottom mold 5 moves for the second time, it ejects the tablet to complete the discharge. The bottom mold 5 moves twice to form a cycle, which makes the powder tableting process simpler, more convenient, and greatly improves production efficiency.

[0025] As attached Figure 5 As shown, the top mold 6 has a dovetail tenon 86 on one side surface near the cavity 4, and the mold 2 has a dovetail groove 87 on one side surface near the top mold 6 that matches the dovetail tenon 86. The dovetail tenon 86 can be slidably embedded in the dovetail groove 87. By using the limiting effect of the dovetail groove 87 on the dovetail tenon 86, it is ensured that the top mold 6 can move up and down along the end face of the mold 2, which improves the stability of the top mold 6 during use and movement, and at the same time enhances the tightness of the connection between the top mold 6 and the mold 2, reduces the probability of edge gaps appearing in the powder sheet after molding, and prevents the bottom mold 5 from pushing out the top mold 6 that is blocking the cavity 4 when extruding the powder, thus affecting the molding of the powder in the cavity 4.

[0026] As attached Figure 1 As shown, the top of the top mold 6 is connected to the piston of the cylinder 8. The cylinder 8 is mounted on the gantry frame 10, which is fixed to the upper surface of the worktable 1. The piston of the cylinder 8 drives the top mold 6 to move along the end face of the mold 2 to block or open the cavity 4, ensuring the molding of the powder and the discharge of the powder tablets after molding.

[0027] As attached Figure 4As shown, limit blocks 74 are fixed on both sides of the slider 74, and the crank 72 is provided with a limit groove 742 that is adapted to the limit block 74. The limit block 74 is slidably installed in the limit groove 742. The limit groove 742 limits the limit block 74, preventing the limit block 74 from shifting or sliding out of the slide groove 73 during the force-moving process, and ensuring that the limit block 74 can move accurately along the slide groove 73 to compress the spring 75 to form a pressure-holding state.

[0028] As attached Figure 4 As shown, each of the slider 74 and crank 72 is provided with a hanging ring 79, and the two ends of the spring 75 are hook-shaped. The hooks at both ends of the spring 75 hook onto the hanging ring 79 respectively. The hanging ring 79 is designed to facilitate the replacement of springs 75 with different elastic coefficients. By replacing springs 75 with different elastic coefficients, the forming pressure of various powders with different forming pressures can be met. When the forming pressure required for powder forming is large, a spring 75 with a larger elastic coefficient is used. The spring 75 is not easily compressed, so the bottom mold 5 exerts a large extrusion force on the powder, which promotes powder forming. Conversely, a spring 75 with a smaller elastic coefficient is used, thereby expanding the applicability of the powder tableting machine.

[0029] As attached Figure 2 As shown, the mold 2 has a relief groove 78 on one end near the bottom mold 5, which is adapted to the connecting rod 71. The connecting rod 71 is slidably disposed in the relief groove 78 to avoid the connecting rod 71 colliding with the mold 2 during rotation and use, which would cause damage to the mold 2 and the connecting rod 71, thereby protecting the integrity of the connecting rod 71 and the mold 2. When the bottom mold 5 is located at the rightmost side of the cavity 4, the left side of the bottom mold 5 still covers the upper left of the relief groove 78. The bottom mold 5 blocks the relief groove 78 to prevent the powder poured into the cavity 4 from the feed port 3 from falling into the relief groove 78, which would reduce the amount of powder and prevent molding.

[0030] When processing powder, a fixed amount of powder is poured into the cavity 4 from the feed port 3 through the electric valve 12 on the feed hopper 11. After the powder is fed, the motor 76 is started. The motor 76 drives the crank 72 and connecting rod 71 to move continuously. The bottom mold 5 moves along the cavity 4 under the drive of the crank 72 and connecting rod 71, pushing the powder in the cavity 4 to the surface of the top mold 6 to begin extrusion. When the powder in the cavity 4 is basically formed, the bottom mold 5 continues to extrude the powder under the action of the crank 72 and connecting rod 71. When the extrusion pressure exceeds the preload of the spring 75 inside the crank 72, the slider 74 begins to move along the slide groove 73 to compress the spring 75. The details are as shown in the attached figure. Figure 7As shown, at this time, the bottom mold 5 remains stationary, continuously compressing the powder to form a pressure-holding state, promoting the formation of powder tablets and preventing the powder from being too loose due to insufficient compression time. Simultaneously, the crank 72 and connecting rod 71 continue to rotate. When the extrusion pressure of the bottom mold 5 on the powder begins to decrease, the spring 75, under the action of elastic restoring force, begins to extend and push the slider 74 outward to return to its original shape. Then, the crank 72 and connecting rod 71 continue to rotate, driving the bottom mold 5 to return to its original position. At this point, the powder tableting is complete, as detailed in the attached diagram. Figure 8 As shown, when crank 72 and connecting rod 71 continue to rotate, driving the bottom mold 5 away from the already formed powder sheet, the top mold 6 and dovetail tenon 86 move upward along the dovetail groove 87 under the drive of cylinder 8, opening the cavity 4, thereby extending the holding time of the powder sheet, ensuring the forming quality of the powder sheet, and preventing the top mold 6 from moving away too early, causing the powder sheet to fall directly from the opening of the cavity 4 under the squeezing force of the bottom mold 5 without sufficient holding time, which would affect the forming quality of the powder sheet. Then, under the action of crank 72 and connecting rod 71, the bottom mold 5 approaches the already formed powder sheet again. At this time, the powder sheet, without the resistance of the top mold 6, can be smoothly pushed out of the cavity 4 by the bottom mold 5 and fall into the storage box 9 from the cavity opening to complete the discharge. The details are as shown in the attached figure. Figure 9 As shown, when the bottom mold 5 returns after the discharge is completed, the top mold 6 moves downward to block the cavity 4 again. Then, the powder is poured in from the feed port 3. The above operation is repeated to achieve batch processing. Compared with the traditional powder tableting machine, which requires the top mold 6 and bottom mold 5 to be removed first, and then other equipment such as cylinders to eject the formed powder tablets, the bottom mold 5 is repeatedly moved by the continuous rotation of the crank 72 and connecting rod 71. When the bottom mold 5 moves for the first time, it compresses the powder to form a tablet. When the bottom mold 5 moves for the second time, it ejects the tablet to complete the discharge. The bottom mold 5 moves twice to form a cycle, which makes the powder tableting process simpler, more convenient to operate, and greatly improves production efficiency.

[0031] A method of using a powder tableting machine, characterized by the following steps:

[0032] The first step is to pour a fixed amount of powder into the mold cavity 4 through the feed inlet 3;

[0033] The second step is to start the motor 76. The motor 76 drives the crank 72 and the connecting rod 71 to move continuously. The bottom mold 5 moves along the cavity 4 under the drive of the crank 72 and the connecting rod 71, pushing the powder in the cavity 4 to the surface of the top mold 6 to start extrusion.

[0034] Thirdly, after the powder in cavity 4 has basically taken shape, the bottom mold 5 continues to extrude the powder under the action of crank 72 and connecting rod 71. When the extrusion pressure exceeds the preload of spring 75 inside crank 72, slider 74 begins to move along slide groove 73 to compress spring 75, as detailed in the attached diagram. Figure 7As shown, at this time, the bottom mold 5 remains stationary and continuously compresses the powder to form a pressure-holding state, which promotes the formation of powder tablets and prevents the powder from being too compact and easily loose due to short compression time.

[0035] Fourthly, as crank 72 and connecting rod 71 continue to rotate, when the extrusion pressure of the bottom mold 5 on the powder begins to decrease, spring 75, under the action of elastic restoring force, begins to extend and push slider 74 outward to return to its original shape. Then, crank 72 and connecting rod 71 continue to rotate, driving the bottom mold 5 to return to its original position. At this point, the powder tableting is complete. See attached diagram for details. Figure 8 As shown;

[0036] Fifth step: As crank 72 and connecting rod 71 continue to rotate, driving bottom mold 5 away from the already formed powder tablet, top mold 6 and dovetail tenon 86 move upward along dovetail tenon 87 under the drive of cylinder 8, opening the cavity 4. Opening top mold 6 later can extend the holding time of powder tablet, ensuring the forming quality of powder tablet, and preventing top mold 6 from moving away too early, causing powder tablet to fall directly from the opening of cavity 4 under the extrusion pressure of bottom mold 5 without sufficient holding time, thus affecting the forming quality of powder tablet;

[0037] Step 6: Then, under the action of crank 72 and connecting rod 71, the bottom mold 5 approaches the already formed powder tablet again. At this time, because the powder tablet is not resisted by the top mold 6, it can be smoothly pushed out of the cavity 4 by the bottom mold 5 and fall into the storage box 9 from the cavity opening to complete the discharge. The details are as shown in the attached figure. Figure 9 As shown;

[0038] Step 7: When the bottom mold 5 returns to its original position after the discharge, the top mold 6 moves downward to block the cavity 4 again. Then, the powder is poured in through the feed inlet 3. This process is repeated to achieve batch processing. Compared with traditional powder tableting machines, which require the top mold 6 and bottom mold 5 to be removed before using other equipment such as cylinders to eject the formed powder tablets, the bottom mold 5 is repeatedly moved by the continuous rotation of the crank 72 and connecting rod 71. When the bottom mold 5 moves for the first time, it compresses the powder to form a tablet. When the bottom mold 5 moves for the second time, it ejects the tablet to complete the discharge. The bottom mold 5 moves twice to form a cycle, making the powder tableting process simpler, more convenient, and greatly improving production efficiency.

[0039] The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A powder tableting machine, comprising a mold, a cavity, a bottom mold, and a top mold, wherein the mold has a cavity inside, a bottom mold adapted to the cavity is slidably mounted inside the cavity, and a top mold slidably covers the side of the mold away from the bottom mold, characterized in that: It also includes a pressing mechanism connected to the bottom mold. The pressing mechanism includes a connecting rod, a crank, a slide groove, a slider, a spring, and a rotating shaft. One end of the connecting rod is rotatably connected to the bottom mold, and the other end is rotatably mounted on the surface of the slider. The slider is slidably mounted in the slide groove, which is located inside the crank. The spring is fixed in the slide groove, and its two ends are respectively connected to the crank and the slider. The end of the crank furthest from the slider is rotatably mounted on the outside of the rotating shaft. Limit blocks are fixed on both sides of the slider. The crank has limit grooves adapted to the limit blocks, allowing the limit blocks to slide. The spring is installed in the limiting groove. Each of the slider and crank surfaces is provided with a hanging ring, and the two ends of the spring are hook-shaped. The hooks at both ends of the spring hook the hanging rings respectively. The mold is provided with a relief groove that matches the connecting rod on the end near the bottom mold. The connecting rod is slidably located in the relief groove. When the bottom mold is located at the rightmost side of the cavity, the left side of the bottom mold still covers the upper left of the relief groove. After the powder in the cavity is basically formed, the bottom mold continues to compress the powder. When the extrusion pressure exceeds the spring preload, the slider begins to move to compress the spring. At this time, the bottom mold remains stationary and continues to compress the powder to form a pressure holding state.

2. The powder tableting machine according to claim 1, characterized in that: The top mold has a dovetail tenon on one side of the cavity, and the mold has a dovetail groove on one side of the top mold that matches the dovetail tenon. The dovetail tenon can be slidably embedded in the dovetail groove.

3. The powder tableting machine according to claim 1, characterized in that: The top of the top mold is connected to a cylinder, which is mounted on a gantry frame, which is fixed to the upper surface of the worktable.

4. The method of using a powder tableting machine as described in claim 1, characterized in that, Follow these steps: The first step is to pour a fixed amount of powder into the mold cavity through the feed inlet; The second step is to start the motor so that the crank and connecting rod continue to move, while the bottom mold pushes the powder in the cavity to the surface of the top mold to start extrusion under the drive of the crank and connecting rod. The third step is that after the powder in the cavity is basically formed, the bottom mold continues to squeeze the powder. When the squeezing force exceeds the spring preload, the slider begins to move to compress the spring. At this time, the bottom mold remains stationary and continues to compress the powder to form a pressure-holding state. Fourth step: When the pressure of the bottom die on the powder begins to decrease, the spring begins to return to its original shape under the action of elastic restoring force, and then the bottom die returns, at which point the powder tableting is completed; Fifth step: After the bottom mold leaves the already formed powder sheet, move the top mold upward to open the cavity opening; The sixth step is to bring the bottom mold close to the already formed powder sheet again and push the powder sheet out of the cavity to complete the discharge. Step 7: When the bottom mold returns to its original position after the material discharge is completed, the top mold moves downward to block the cavity opening again. Then, the powder is poured in from the feed port. The above operation is repeated to process the powder.

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