Single and double color dual-purpose rotary tablet press

Abstract

This utility model provides a single- or dual-color rotary tablet press, relating to the field of chemical tableting. The single- or dual-color rotary tablet press includes a housing, a turntable, an upper pressing mechanism, a lower pressing mechanism, a transmission mechanism, and a feeding mechanism. The turntable is located at the center of the housing. Four columns are fixedly installed inside the housing, and an upper pressing wheel frame is fixedly installed on the top surface of the four columns. An upper track plate is installed above the upper pressing wheel frame. This single- or dual-color rotary tablet press achieves double protection through a fully enclosed cast iron housing and upper punch, middle die, and lower punch, effectively isolating dust and oil contaminants. It also exhibits excellent resistance to highly corrosive materials. Equipped with a high-precision reducer and a 22 kW motor, combined with variable frequency stepless speed regulation, it operates stably and consumes little energy. An innovative secondary pressing process with pre-venting ensures high tablet hardness and smoothness. Simultaneously, continuous rotary production significantly improves efficiency, making it particularly suitable for the large-scale pressing needs of special materials such as sterilized tablets.

Description

Technical Field

[0001] This utility model relates to a tablet press, specifically a single- or dual-color rotary tablet press, belonging to the field of chemical tablet pressing technology. Background Technology

[0002] Tablet presses are commonly used in the production of chemical pharmaceuticals. Most existing tablet presses are single-punch tablet presses, while a small number are large-tonnage tablet presses and hydraulic tablet presses. Single-punch tablet presses: This type of machine has a slow pressing speed, producing only 23 tablets per minute. It is noisy, has low output, high energy consumption (40KW motor), produces too many broken tablets, and can only press one color. Ordinary large-tonnage rotary tablet presses: The reducers used are all ordinary worm gear reducers. This type of machine presses chemical products that are particularly difficult to compress and shape, so the machine pressure requirements are particularly high.

[0003] Ordinary worm gear reducers develop backlash after a period of use, causing significant noise during the pressing process and limiting the pressing to a single color. Hydraulic tablet presses, on the other hand, use an oil pump to supply oil to cylinders. The cylinders move up and down; the upper cylinder, after being filled with material in the middle mold, moves downwards, pushing against the lower cylinder to create pressure and press the product into shape. This pressing method is extremely slow, only pressing 3-4 times per minute. Chemical plants are inherently high-risk areas, vulnerable to oil and fire hazards. Hydraulic presses require large amounts of oil to operate, significantly increasing safety risks in chemical plants. Therefore, we offer a single / dual-color rotary tablet press to solve these problems. Utility Model Content

[0004] The purpose of this invention is to provide a single- or dual-color rotary tablet press to solve the problems of high noise, high energy consumption, and low efficiency in the prior art.

[0005] This utility model is achieved through the following technical solution: a single-color dual-purpose rotary tablet press, including a housing, a turntable, an upper pressing mechanism, a lower pressing mechanism, a transmission mechanism, and a feeding mechanism. The turntable is located at the center inside the housing. Four columns are fixedly installed inside the housing. An upper pressing wheel frame is fixedly installed on the top surface of the four columns. An upper track plate is installed above the upper pressing wheel frame. The upper track plate is installed on the turntable. The turntable, the upper pressing mechanism, and the lower pressing mechanism all include a lower punch.

[0006] The upper pressing mechanism includes an upper pressing wheel and an upper punch rod. The upper pressing wheel is equipped with an upper pressing wheel adjustment device. The upper punch rod is mounted on the surface of the turntable via an upper track plate.

[0007] The pressing mechanism includes a pressing wheel, which is equipped with a pressing wheel adjustment device. The pressing rod is installed into the turntable through the mounting hole on the lower track main board.

[0008] Preferably, the turntable is provided with a middle mold and an upper punch rod inside, and the middle mold, upper punch rod and lower punch rod are respectively installed on the upper layer, middle layer and lower layer of the turntable.

[0009] Preferably, the feeding mechanism includes a feeding hopper, a feeding pipe, and a feeder arranged in sequence. The feeding mechanism is equipped with a filling adjustment device. One end of the feeding pipe is fixedly connected to the feeding hopper, and the end of the feeding pipe away from the feeding hopper is fixedly connected to the feeder. The outer surface of the feeding pipe is fixedly connected to the housing.

[0010] Preferably, the transmission mechanism includes a speed reducer and a motor, which are connected by a transmission component. The fixed ends of both the speed reducer and the motor are fixedly connected to the housing, and the output end of the speed reducer is fixedly connected to the turntable.

[0011] Preferably, an adjusting plate is installed inside the housing, and an upper pressure roller shaft is rotatably connected to the inner wall of the adjusting plate, with a bearing installed between the upper pressure roller and the upper pressure roller shaft.

[0012] Preferably, a material discharge plate is installed between the feed hopper and the discharge pipe, and a material pipe positioning screw is threadedly connected between the feed hopper and the discharge pipe.

[0013] This utility model provides a single-color and dual-purpose rotary tablet press, which has the following beneficial effects:

[0014] 1. This machine adopts an all-cast iron casting process, with a total weight of 7.5 tons. This effectively suppresses vibration during the tableting process, ensuring stable and smooth operation, thereby improving product hardness, weight consistency, and appearance quality. All parts that come into direct contact with materials, including the middle die, upper punch, and lower punch, are made of TC4 titanium alloy, providing excellent corrosion protection against corrosive materials such as sodium dichloroisocyanurate and significantly extending service life. In addition, the enclosed shell design isolates dust and oil cross-contamination, and with the automatic lubrication system, completely avoids oil droplet contamination of the product, ensuring the purity of the medicine and the safety of the production environment. These structural innovations enable the equipment to maintain reliable performance under high pressure and high corrosion conditions.

[0015] 2. In terms of transmission mechanism, this machine adopts a high-precision double-coated chrome-plated circular arc gear reducer with a fully enclosed worm gear design, eliminating noise and backlash issues, ensuring a warranty life of more than five years, and reducing maintenance requirements. It only requires a 22 kW motor drive, significantly reducing energy consumption compared to the 35 kW power consumption of similar models, saving electricity costs in continuous production. The rotary automatic continuous production process, combined with variable frequency stepless speed regulation, achieves a highly efficient pressing process, with a per-minute output far exceeding that of traditional single-punch or hydraulic tablet presses. The pre-compression roller process prioritizes air discharge, ensuring a smooth tablet surface, making it particularly suitable for pressing corrosive sterilization tablets, improving overall production efficiency and economy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the feeding device of this utility model;

[0018] Figure 3 This is a schematic diagram of the upper pressure wheel adjustment device of this utility model;

[0019] Figure 4 This is a schematic diagram of the filling adjustment device of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the pressure wheel adjustment device of this utility model;

[0021] Figure 6 This is a schematic diagram of the preload wheel adjustment device of this utility model.

[0022] [Explanation of Key Component Symbols]

[0023] 1. Shell; 2. Feed hopper; 3. Discharge pipe; 4. Upper pressure roller; 5. Upper pressure roller adjustment device; 501. Adjustment plate; 502. Bearing; 503. Upper pressure roller shaft; 6. Upper track plate; 7. Feeder; 701. Discharge insert plate; 702. Material pipe positioning screw; 8. Upper punch; 9. Turntable; 10. Middle die; 11. Lower punch; 12. Lower pressure roller; 13. Filling adjustment device; 14. Lower pressure roller adjustment device; 15. Reducer; 16. Motor. Detailed Implementation

[0024] This utility model embodiment provides a single- or dual-color rotary tablet press.

[0025] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6The system includes a turntable 9, an upper pressing mechanism, a lower pressing mechanism, a transmission mechanism, and a feeding mechanism. The turntable 9 is located at the center of the housing 1. Four columns are fixedly installed inside the housing 1, and an upper pressing wheel frame is fixedly installed on the top surface of the four columns. An upper track plate 6 is installed above the upper pressing wheel frame and is mounted on the turntable 9. The turntable 9, the upper pressing mechanism, and the lower pressing mechanism all include a lower punch 11. The upper pressing mechanism includes an upper pressing wheel 4 and an upper punch 8. The upper pressing wheel 4 is equipped with an upper pressing wheel adjustment device 5. The upper punch 8 is mounted on the surface of the turntable 9 via the upper track plate 6. The pressing mechanism includes a lower pressing roller 12, which is equipped with a lower pressing roller adjustment device 14. The lower punch rod 11 is installed into the turntable 9 through the mounting holes on the lower rail main board. The turntable 9 is made of cast iron. By adding four columns to support the upper pressing roller frame, it can withstand the pressing reaction force of up to 100 tons, ensuring that the turntable 9 does not move during the pressing process and improving the stability of the whole machine. Both the upper pressing roller adjustment device 5 and the lower pressing roller adjustment device 14 adopt cast steel bases. The pressure is finely adjusted by the eccentric shaft to avoid overload damage to the punch rod. At the same time, the touch screen monitors the pressure status in real time to ensure safe production.

[0026] The adjusting filling device 13 includes a flow control screw with a knurled knob, a stainless steel baffle and a powder chamber height scale. The screw is made of 304 stainless steel. The bottom gap of the feeder 7 is controlled by axial displacement to achieve stepless adjustment of the powder quantity. The baffle prevents powder from overflowing to the side. The scale ensures that the filling quantity error is ≤±1.5%, ensuring that the material is uniformly filled into the middle mold 10.

[0027] The core components of the lower pressure roller adjustment device 14 are an eccentric adjustment shaft and a locking nut assembly made of 40Cr alloy steel. By rotating the eccentric shaft, the contact position between the lower pressure roller 12 and the lower punch rod 11 is changed, thereby controlling the punching depth and precisely adjusting the tablet hardness. The locking nut assembly includes anti-loosening washers to prevent displacement under high pressure conditions and ensure pressure stability.

[0028] The turntable 9 is equipped with a middle die 10 and an upper punch 8. The middle die 10, upper punch 8 and lower punch 11 are respectively installed in the upper, middle and lower layers of the turntable 9. The layered layout of the middle die 10 and punches achieves precise alignment. The middle die 10 is made of TC4 titanium alloy, which is resistant to highly corrosive materials. The upper punch 8 and lower punch 11 are titanium-plated, with a hardness of HRC45 or higher, which reduces friction and wear with materials, extends the die life to 3 times that of ordinary steel, and eliminates metal contamination.

[0029] The feeding mechanism includes a feeding hopper 2, a feeding pipe 3, and a feeder 7 arranged in sequence. The feeding mechanism is equipped with a filling adjustment device 13. One end of the feeding pipe 3 is fixedly connected to the feeding hopper 2, and the end of the feeding pipe 3 away from the feeding hopper 2 is fixedly connected to the feeder 7. The outer surface of the feeding pipe 3 is fixedly connected to the shell 1. The inner walls of the feeding hopper 2 and the feeder 7 are covered with TC4 titanium lining to avoid corrosion of the raw materials. The filling adjustment device 13 controls the powder amount through a screw and works with the feeder 7 to achieve stepless flow rate adjustment, ensuring uniform filling and significantly reducing the breakage rate.

[0030] The transmission mechanism includes a reducer 15 and a motor 16, which are connected by a transmission component. The fixed ends of both the reducer 15 and the motor 16 are fixedly connected to the housing 1. The output end of the reducer 15 is fixedly connected to the turntable 9. The reducer 15 adopts a double-coated chrome-plated circular arc tooth worm gear with a tooth surface hardness of HRC58-62. When combined with a 22kW variable frequency motor 16, the transmission efficiency reaches over 92%. The cast iron housing 1 has built-in shock-absorbing pads, which makes the operating noise ≤75dB. The energy consumption is reduced by 30% compared with traditional models, and it supports continuous 24-hour pressing.

[0031] An adjusting plate 501 is installed inside the housing 1. The inner wall of the adjusting plate 501 is rotatably connected to the upper pressure roller shaft 503. A bearing 502 is installed between the upper pressure roller 4 and the upper pressure roller shaft 503. The adjusting plate 501 is made of QT500 ductile iron with a compressive strength of 500MPa. The upper pressure roller shaft 503 is equipped with a GCr15 bearing 502, which increases the load-bearing capacity by 40%. When the pressure exceeds the limit, the spring sleeve automatically unloads with a response time of <0.2 seconds, triggering the shutdown protection to avoid the punch rod breakage accident.

[0032] A discharge plate 701 is installed between the feed hopper 2 and the discharge pipe 3. A pipe positioning screw 702 is threaded between the feed hopper 2 and the discharge pipe 3. The discharge plate 701 is made of 304 stainless steel with a surface polishing Ra≤0.8μm to prevent material adhesion. The pipe positioning screw 702 enables stepless adjustment of the height of the feed hopper 2. It works in conjunction with the powder quantity knob to control the risk of flow overflow, adapting to different flowability materials, with a switching time ≤5 minutes.

[0033] The housing 1 is equipped with a pre-compression wheel adjustment device, which includes a stepped spring sleeve and a pre-compression wheel support frame. The sleeve has a built-in three-stage compression spring. By screwing the sleeve to pre-tighten the spring, the pre-compression wheel can be pressurized in stages, and the air in the middle mold 10 can be expelled first. The support frame adopts a welded steel plate structure and works with the guide rail to ensure the vertical movement of the pre-compression wheel, thereby improving the density of the tablets.

[0034] The structural diagrams of the components shown in the attached figures are exemplary. The specific implementation should be adapted and optimized by considering the functional requirements, assembly conditions and process limitations in the actual application scenario, and adjusting the structural parameters, size specifications and connection methods accordingly.

[0035] Working principle: First, the material enters the feeder 7 from the feed hopper 2 through the discharge pipe 3. The flow rate is precisely controlled by the filling adjustment device 13. Second, when the turntable 9 rotates, it drives the punch, and the material is filled into the middle die 10. Next, the tableting action is completed by the upper and lower punches. The upper punch 8 descends along the curved track of the upper track plate 6 and cooperates with the lower punch 11. Pressure is applied through the upper pressure roller 4 and the lower pressure roller 12. The pressure can be finely adjusted by the upper pressure roller adjustment device 5 and the lower pressure roller adjustment device 14. Finally, the pressed tablets are automatically discharged. This machine adopts a two-stage pressing process. First, the air is discharged through the pre-pressing roller to ensure that the product has high hardness and a smooth surface. The fully enclosed shell 1 prevents dust from flying. The reducer 15 uses a high-precision worm gear drive and is equipped with an automatic lubrication system to avoid oil contamination. The overall design achieves low noise and high stability, and is especially suitable for pressing corrosive materials such as disinfectant tablets. The output per minute is much higher than that of traditional models.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A single-color dual-purpose rotary tablet press, comprising a housing (1), a turntable (9), an upper pressing mechanism, a lower pressing mechanism, a transmission mechanism, and a feeding mechanism, characterized in that: The turntable (9) is located at the center of the housing (1). Four columns are fixedly installed inside the housing (1). An upper pressure wheel frame is fixedly installed on the top surface of the four columns. An upper track plate (6) is installed above the upper pressure wheel frame. The upper track plate (6) is installed on the turntable (9). The turntable (9), the upper pressure mechanism, and the lower pressure mechanism all include a lower punch (11). The upper pressing mechanism includes an upper pressing wheel (4) and an upper punch (8). The upper pressing wheel (4) is equipped with an upper pressing wheel adjustment device (5). The upper punch (8) is mounted on the surface of the turntable (9) via an upper track plate (6). The pressing mechanism includes a pressing wheel (12), the pressing wheel (12) is equipped with a pressing wheel adjustment device (14), and the pressing rod (11) is installed into the turntable (9) through the mounting hole on the lower track main board.

2. The single-color / dual-color rotary tablet press according to claim 1, characterized in that: The turntable (9) is equipped with a middle mold (10) and an upper punch (8) inside. The middle mold (10), the upper punch (8) and the lower punch (11) are respectively installed on the upper, middle and lower layers of the turntable (9).

3. The single-color / dual-color rotary tablet press according to claim 1, characterized in that: The feeding mechanism includes a feeding hopper (2), a feeding pipe (3) and a feeder (7) arranged in sequence. The feeding mechanism is equipped with a filling adjustment device (13). One end of the feeding pipe (3) is fixedly connected to the feeding hopper (2), and the end of the feeding pipe (3) away from the feeding hopper (2) is fixedly connected to the feeder (7). The outer surface of the feeding pipe (3) is fixedly connected to the shell (1).

4. The single-color / dual-color rotary tablet press according to claim 1, characterized in that: The transmission mechanism includes a speed reducer (15) and a motor (16). The speed reducer (15) and the motor (16) are connected by a transmission component. The fixed ends of the speed reducer (15) and the motor (16) are fixedly connected to the housing (1). The output end of the speed reducer (15) is fixedly connected to the turntable (9).

5. The single-color / dual-color rotary tablet press according to claim 1, characterized in that: An adjusting plate (501) is installed inside the housing (1). An upper pressure wheel shaft (503) is rotatably connected to the inner wall of the adjusting plate (501). A bearing (502) is installed between the upper pressure wheel (4) and the upper pressure wheel shaft (503).

6. The single-color / dual-color rotary tablet press according to claim 3, characterized in that: A material discharge plate (701) is installed between the feed hopper (2) and the discharge pipe (3), and a material pipe positioning screw (702) is threaded between the feed hopper (2) and the discharge pipe (3).

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