Packaging equipment for tablet production

CN224618196UActive Publication Date: 2026-08-11GUANGDONG LIANCUN PHARMACEUTICAL TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-08-28
Publication Date
2026-08-11

AI Technical Summary

Technical Problem

[0003]然而,现有的片剂包装机在实际应用中仍存在一些亟待解决的问题,其中,片剂在上料过程中,由于相互之间的摩擦与碰撞会产生粉末,这些粉末若掉落至包装瓶内,会严重影响装药质量,导致设备实用性下降,为解决这一问题,相关技术领域进行了诸多探索,例如公告号为“CN217554219U”的中国专利公开了一种片剂包装机,该装置通过设置收集箱、筛分组件、推料组件和回收框等结构,旨在实现对片剂粉末的收集利用,防止粉末影响装药质量;

Benefits of technology

[0016]第一、本装置应用期间其安装轨道框倾斜设置,筛分网板滑动连接其中,片剂借自身重力自然下滑完成过滤,无需额外推料结构,大幅减少与网板摩擦,降低片剂碎裂和额外粉尘产生的可能,保障过滤高效稳定,同时,侧板可防片剂侧漏,提升过滤可靠性,配合负压吸尘机构,吸风机产生负压经吸风斗吸附悬浮粉末,滤尘网板过滤空气防污染,回收抽屉方便收集粉末再利用,改善工作环境;

✦ Generated by Eureka AI based on patent content.

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  • Figure CN224618196U_ABST
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Patent Text Reader

Abstract

This utility model discloses a packaging equipment for tablet production, relating to the field of tablet production and packaging technology. It includes a base frame, with a screening box fixedly installed on the top of the base frame. A filtering mechanism is fixedly installed inside the screening box, and a packaging mechanism is fixedly installed at the output end of the filtering mechanism on the top of the base frame. This utility model employs the above structure. During application, the mounting track frame is inclined, with the screening screen plate slidably connected within it. Tablets slide down naturally under their own weight to complete filtration, eliminating the need for an additional pushing structure. This significantly reduces friction with the screen plate, lowering the possibility of tablet breakage and additional dust generation, ensuring efficient and stable filtration. Simultaneously, the side plates prevent tablet leakage, improving filtration reliability. Combined with a negative pressure dust collection mechanism, the suction fan generates negative pressure, which adsorbs suspended powder through the suction hopper. The dust filter plate filters the air to prevent pollution, and the recycling drawer facilitates powder collection and reuse, improving the working environment.
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Description

Technical Field

[0001] This utility model belongs to the field of tablet production and packaging technology, and specifically relates to a packaging equipment for tablet production. Background Technology

[0002] As a dosage form developed from pills, tablets have seen rapid development in production and application since their creation in the 1840s, thanks to continuous improvements in tableting machinery and innovations in production technology, such as fluidized bed granulation, direct compression of all powders, and integrated production. In the processing of tablets and granules, tablet packaging machines are indispensable equipment, directly affecting the quality and efficiency of tablet packaging.

[0003] However, existing tablet packaging machines still have some problems that need to be solved in practical applications. Among them, during the feeding process, tablets generate powder due to friction and collision. If this powder falls into the packaging bottle, it will seriously affect the quality of the filling and reduce the practicality of the equipment. To solve this problem, many explorations have been carried out in related technical fields. For example, Chinese patent with announcement number "CN217554219U" discloses a tablet packaging machine. This device aims to collect and utilize tablet powder by setting up a collection box, screening component, pushing component and recycling frame, so as to prevent the powder from affecting the quality of the filling.

[0004] However, a deeper analysis of its specific usage reveals certain defects and shortcomings in the overall structure of the device: First, its screening component uses a horizontally arranged filter screen. During the feeding process, the pusher plate pushes the tablets to move laterally along the filter screen, which leads to continuous friction between the tablets and the filter screen. On the one hand, this further generates more dust, exacerbating the powder problem; on the other hand, it easily causes tablet breakage, increasing the production of defective products and seriously affecting subsequent packaging and usage effects. Second, the filter screen of this device is not easy to disassemble and assemble. During long-term use, some large particles of debris will adhere to the filter screen, which can easily lead to filter screen blockage over time. This not only reduces screening efficiency but also makes it difficult to quickly inspect and clean the equipment, increasing maintenance costs and operational difficulty, thus limiting its widespread application in actual production. Therefore, it is necessary to further improve the design of the existing tablet packaging machine in terms of screening, feeding, and filter screen maintenance to improve the quality and efficiency of tablet packaging. Utility Model Content

[0005] In view of the problems mentioned in the background art, the purpose of this utility model is to provide a packaging equipment for tablet production to solve the problems raised in the background art.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A packaging device for tablet production includes a base frame, a screening box fixedly installed on the top of the base frame, a filtering mechanism fixedly installed inside the screening box, a packaging mechanism fixedly installed on the top of the base frame at the output end of the filtering mechanism, and a negative pressure dust collection mechanism fixedly installed at the bottom of the screening box.

[0008] The filtration mechanism includes a mounting track frame, which is fixedly installed in the middle of the screening box. The mounting track frame is inclined as a whole. A screening screen plate is slidably connected inside the mounting track frame. The upper and lower ends of the screening screen plate pass through the mounting track frame. A limit component is fixedly installed at the upper end of the mounting track frame.

[0009] As a preferred technical solution, a side plate is fixedly installed on the top of the screening screen plate, the side plate covers the input end of the mounting track frame, and a bridge-type handrail is fixedly installed on the outer side of the side plate.

[0010] As a preferred technical solution, a discharge guide hopper is fixedly installed at the lower end of the screening screen plate, and the output end of the discharge guide hopper is located above the packaging mechanism.

[0011] As a preferred technical solution, the packaging mechanism includes a fixed base, which is fixedly connected to the top side of the base frame. A drive motor is fixedly installed at the bottom of the fixed base. A rotating shaft is fixedly installed through the output end of the drive motor and at the top of the fixed base. A turntable is fixedly installed at the top of the rotating shaft. Placement seats are fixedly installed at equal intervals in a ring on the top of the turntable. A packaging bottle is placed on the top of the placement seats.

[0012] As a preferred technical solution, the limiting component includes a guide rail and a locking hole. The guide rail is fixedly installed on the upper end of the mounting track frame. Limiting springs are fixedly connected to both ends of the guide rail. A slider is fixedly installed on the outer end of the limiting spring. A limiting arm is fixedly connected to the outer side of the slider. The locking hole is opened on both sides of the upper end of the mounting track frame and the screening screen plate. The end of the limiting arm passes through the locking hole on the mounting track frame and is inserted into the locking hole of the screening screen plate.

[0013] As a preferred technical solution, an adjusting push plate is fixedly connected to the outer side of the slider, and the adjusting push plate is generally L-shaped.

[0014] As a preferred technical solution, the negative pressure dust collection mechanism includes a suction fan and a recycling drawer. The suction fan is fixedly installed in the top middle of the base frame. A suction hopper is fixedly installed at the input end of the suction fan. The input end of the suction hopper is connected to the inside of the screening box. The recycling drawer is slidably connected to the lower end of the inside of the screening box. A groove is opened in the middle of the front of the screening box. A ventilation window is opened at the upper back of the screening box. A dust filter plate is fixedly installed inside the ventilation window. The dust filter plate is located directly in front of the input end of the suction hopper.

[0015] In summary, the present invention has the following main advantages:

[0016] First, during the application of this device, the installation track frame is set at an inclination, and the screening screen plate is slidably connected to it. The tablets slide down naturally under their own gravity to complete the filtration, without the need for an additional pushing structure. This greatly reduces friction with the screen plate, reduces the possibility of tablet breakage and additional dust generation, and ensures efficient and stable filtration. At the same time, the side plate can prevent tablet side leakage and improve filtration reliability. With the help of the negative pressure dust collection mechanism, the fan generates negative pressure and adsorbs suspended powder through the suction hopper. The dust filter screen filters the air to prevent pollution, and the recycling drawer facilitates the collection and reuse of powder, improving the working environment.

[0017] Secondly, during the application of this device, its limiting component pushes the slider through the limiting spring, so that the limiting arm inserts into the locking hole to fix the mesh plate. When disassembling, the worker holds the bridge-type handrail and pushes the adjusting push plate, causing the slider to compress the spring, and the limiting arm is pulled out of the locking hole, so that the mesh plate can slide out along the installation track frame. When installing, after sliding into the mesh plate, the push plate is released, and the limiting arm is reset under the action of the spring and inserted into the locking hole to complete the fixation. The operation is simple, which facilitates quick cleaning or maintenance and reduces maintenance costs and time. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

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

[0020] Figure 3 This is a top-view structural diagram of the disassembled state of this utility model;

[0021] Figure 4 This is a top view of the disassembled structure of this utility model;

[0022] Figure 5 This is a utility model Figure 3 A magnified structural diagram at point A.

[0023] Reference numerals: 1. Base frame; 2. Packaging mechanism; 21. Fixed seat; 22. Drive motor; 23. Rotating shaft; 24. Turntable; 25. Placement seat; 26. Packaging bottle; 3. Filtering mechanism; 31. Mounting track frame; 32. Screening screen; 33. Limiting component; 331. Guide rail; 332. Clip hole; 333. Limiting spring; 334. Slider; 335. Limiting arm; 336. Adjusting push plate; 34. Side plate; 35. Bridge-type handrail; 36. Discharge guide hopper; 4. Screening box; 5. Negative pressure dust collection mechanism; 51. Fan; 52. Dust filter screen; 53. Recycling drawer; 54. Suction hopper; 55. Groove; 56. Ventilation window. Detailed Implementation

[0024] Example

[0025] refer to Figures 1 to 5 This embodiment of a tablet production packaging equipment includes a base frame 1, a screening box 4 fixedly installed on the top of the base frame 1, a filter mechanism 3 fixedly installed inside the screening box 4, a packaging mechanism 2 fixedly installed on the top of the base frame 1 at the output end of the filter mechanism 3, and a negative pressure dust collection mechanism 5 fixedly installed at the bottom inside the screening box 4.

[0026] The filtering mechanism 3 includes a mounting track frame 31, which is fixedly installed in the middle of the screening box 4. The mounting track frame 31 is inclined, and a screening screen plate 32 is slidably connected inside the mounting track frame 31. The upper and lower ends of the screening screen plate 32 pass through the mounting track frame 31. A limit component 33 is fixedly installed at the upper end of the mounting track frame 31. During the operation of this device, tablets are first added from the input end of the screening box 4. After entering the screening box 4, the tablets fall onto the screening screen plate 32 of the filtering mechanism 3. The mounting track frame 31 of the filtering mechanism 3 is fixedly installed in the middle of the screening box 4 and is inclined. The screening screen plate 32 is slidably connected inside the mounting track frame 31, and its upper and lower ends pass through the mounting track frame 31. Under its own gravity, the tablets move along... The inclined sieve plate 32 slides downwards. During the sliding process, the powder and fine debris contained in the tablets fall through the mesh of the sieve plate 32, while the intact tablets continue to slide down the sieve plate 32 and are finally discharged from the lower end of the sieve plate 32, falling to the packaging mechanism 2 located at the output end of the filtration mechanism 3. The packaging mechanism 2 then packages the tablets. At the same time, the negative pressure dust collection mechanism 5 at the bottom of the sieve box 4 is activated to adsorb the suspended powder generated during the sieving process, preventing the powder from scattering in large quantities in the sieve box 4. The limiting component 33 at the upper end of the mounting track frame 31 plays its role in stably restricting the sieve plate 32 within the mounting track frame 31, preventing the sieve plate 32 from shifting or shaking during the tablet sliding process, and ensuring that the entire filtration process can proceed stably.

[0027] refer to Figures 1-4A side plate 34 is fixedly installed on the top of the screening screen plate 32, covering the input end of the mounting track frame 31. A bridge-type handrail 35 is fixedly installed on the outer side of the side plate 34. A discharge guide hopper 36 is fixedly installed at the lower end of the screening screen plate 32, and the output end of the discharge guide hopper 36 is located above the packaging mechanism 2. During the operation of this device, tablets fall onto the screening screen plate 32 after entering the screening box 4. The side plate 34 on the top of the screening screen plate 32 covers the input end of the mounting track frame 31, which can prevent tablets from falling from the side of the input end of the mounting track frame 31 during operation, ensuring that the tablets are safely stored. All the tablets fall onto the sieve plate 32. Under their own gravity, the tablets slide down the inclined sieve plate 32, completing the filtration process. The intact tablets continue to slide down to the discharge guide hopper 36 at the lower end. The discharge guide hopper 36 guides the tablets to the packaging mechanism 2 below its output end, ensuring that the tablets accurately enter the packaging mechanism 2 for packaging. The bridge-type handrail 35 on the outside of the side plate 34 makes it convenient for workers to hold and operate when it is necessary to disassemble or move the sieve plate 32, improving the ease of operation. These structures work together to ensure the orderly progress of the tablet filtration and conveying process.

[0028] refer to Figures 1-4 The packaging mechanism 2 includes a fixed base 21, which is fixedly connected to the top side of the base frame 1. A drive motor 22 is fixedly installed at the bottom of the fixed base 21. A rotating shaft 23 is fixedly installed through the fixed base 21 at the output end of the drive motor 22. A turntable 24 is fixedly installed at the top of the rotating shaft 23. Placement seats 25 are fixedly installed at equal intervals in a ring on the top of the turntable 24. Packaging bottles 26 are placed on the top of the placement seats 25. During the application of this device, when the packaging mechanism 2 is working, the fixed base 21 is fixed to the top side of the base frame 1, providing stable support for the entire packaging mechanism 2. The drive motor 22 starts... After activation, its output end drives the rotating shaft 23 that passes through the fixed base 21 to rotate. The rotating shaft 23 then drives the top turntable 24 to rotate synchronously. The placement seats 25 arranged in a ring at equal intervals on the top of the turntable 24 rotate together with the turntable 24. The placement seats 25 are used to place the packaging bottles 26 and can play a positioning role for the packaging bottles 26 to prevent them from shifting during rotation. When the placement seats 25 rotate to below the output end of the discharge guide hopper 36, the tablets falling from the discharge guide hopper 36 accurately fall into the packaging bottles 26, realizing continuous feeding and packaging. Through the coordinated operation of various components, the efficiency and accuracy of tablet packaging are improved.

[0029] refer to Figure 3 and Figure 5The limiting component 33 includes a guide rail 331 and a locking hole 332. The guide rail 331 is fixedly installed on the upper end of the mounting track frame 31. Limiting springs 333 are fixedly connected to both ends of the guide rail 331. A slider 334 is fixedly installed on the outer end of the limiting spring 333. A limiting arm 335 is fixedly connected to the outer side of the slider 334. The locking holes 332 are located on both sides of the upper end of the mounting track frame 31 and the screening screen plate 32. The end of the limiting arm 335 passes through the locking hole 332 on the mounting track frame 31 and is inserted into the locking hole 332 of the screening screen plate 32. An adjusting push plate 336 is fixedly connected to the outer side of the slider 334. The adjusting push plate 336 is L-shaped. During the application of this device… When the limiting component 33 is working, the guide rail 331 is fixed to the upper end of the mounting track frame 31, providing a mounting and movement track for internal components such as the limiting spring 333 and the slider 334. When the limiting spring 333 is in its natural state, it pushes the slider 334 to move outward within the guide rail 331. The slider 334 drives the outer limiting arm 335 to move synchronously, so that the end of the limiting arm 335 passes through the locking hole 332 on the mounting track frame 31 and inserts into the locking hole 332 of the screening screen plate 32, thereby firmly restricting the screening screen plate 32 within the mounting track frame 31 and preventing the screening screen plate 32 from shifting during operation. When it is necessary to disassemble or assemble the screening screen plate 32, the L-shaped locking arm on the outer side of the slider 334 is pushed. The shape adjustment push plate 336 drives the slider 334 to compress the limit spring 333, so that the limit arm 335 is pulled out from the card hole 332 of the screening screen plate 32, releasing the limit on the screening screen plate 32 and making it easier for the operator to operate. These components work together to ensure the stability of the screening screen plate 32 during operation and to facilitate its disassembly and assembly.

[0030] refer to Figures 1-4The negative pressure dust collection mechanism 5 includes a suction fan 51 and a collection drawer 53. The suction fan 51 is fixedly installed in the top center of the base frame 1. A suction hopper 54 is fixedly installed at the input end of the suction fan 51. The input end of the suction hopper 54 is connected to the interior of the screening box 4. The collection drawer 53 is slidably connected to the lower end of the interior of the screening box 4. A slot 55 is opened in the center of the front of the screening box 4, and a ventilation window 56 is opened at the upper end of the back of the screening box 4. A dust filter plate 52 is fixedly installed inside the ventilation window 56. The dust filter plate 52 is located directly in front of the input end of the suction hopper 54. During the application of this device, when the negative pressure dust collection mechanism 5 is working, the suction fan 51 is fixed in the top center of the base frame 1. After starting, the suction hopper at the input end... The suction hopper 54 generates negative pressure, and its input end is connected to the inside of the sieving box 4, which can suck in the suspended powder generated during the sieving process. The ventilation window 56 at the upper back of the sieving box 4 provides a channel for air circulation. The dust filter plate 52 inside is located in front of the input end of the suction hopper 54, which can filter the sucked-in air and prevent the powder from being discharged through the ventilation window 56, thus avoiding environmental pollution. The sucked-in powder falls into the recycling drawer 53 at the lower inside of the sieving box 4 under the action of gravity. The recycling drawer 53 is slidably connected so that the staff can pull it out through the slot 55 on the front for processing and reuse of the collected powder. All components work together to achieve effective collection and purification of powder, ensuring a clean working environment.

[0031] Operating principle and advantages: When this tablet production packaging equipment is working, tablets are first added from the input end of the screening box 4. After entering the screening box 4, the tablets fall onto the screening screen plate 32 of the filter mechanism 3. The mounting track frame 31 of the filter mechanism 3 is inclined, and the screening screen plate 32 is slidably connected inside the mounting track frame 31. Under its own gravity, the tablets slide down naturally along the inclined screening screen plate 32. During the descent, the powder and fine debris in the tablets fall through the mesh of the screening screen plate 32, completing the filtration and separation. At this time, the negative pressure dust collection mechanism 5 at the bottom of the screening box 4 is activated, and the suction fan 51 works. The suction hopper 54 at its input end is connected to the inside of the screening box 4, generating negative pressure to suck in the suspended powder generated during the screening process. The sucked-in air passes through the ventilation window 56. After being filtered by the dust filter screen 52, the powder is discharged and collected in the recycling drawer 53. The staff can pull out the recycling drawer 53 through the slot 55 on the front of the screening box 4 to process the collected powder. The intact tablets continue to slide down the screening screen 32 and are discharged through the discharge guide hopper 36 fixedly installed at the lower end of the screening screen 32. The output end of the discharge guide hopper 36 is located above the packaging mechanism 2, and the tablets fall into the packaging bottle 26 of the packaging mechanism 2. When the packaging mechanism 2 is working, the drive motor 22 starts, and its output end drives the turntable 24 to rotate through the rotating shaft 23. The placement seats 25 arranged in a ring at equal intervals on the top of the turntable 24 rotate together with the turntable 24. The packaging bottles 26 on the placement seats 25 move sequentially to the bottom of the discharge guide hopper 36 to receive the material, realizing continuous tablet packaging during use.

[0032] The limiting component 33 of the filter mechanism 3 serves to fix the screening screen plate 32. The limiting spring 333 pushes the slider 334, causing the end of the limiting arm 335 to pass through the locking hole 332 on the mounting track frame 31 and be inserted into the locking hole 332 of the screening screen plate 32, thus stably restricting the screening screen plate 32 within the mounting track frame 31. When it is necessary to disassemble the screening screen plate 32 for cleaning or maintenance, the worker holds the screening screen plate 32 through the bridge handle 35, and then pushes the adjusting push plate 336 to move it. The slider 334 compresses the limiting spring 333, causing the limiting arm 335 to be pulled out of the slot 332 of the screening screen plate 32, thus releasing the limit. Then, the screening screen plate 32 can be slid out along the mounting track frame 31. During installation, the screening screen plate 32 is slid into the mounting track frame 31, the adjusting push plate 336 is released, and the limiting arm 335 is reinserted into the slot 332 under the action of the limiting spring 333 to complete the fixation. The side plate 34 at the top of the screening screen plate 32 covers the input end of the mounting track frame 31 to prevent tablets from falling from the side.

[0033] The tablet production packaging equipment has significant advantages in filtration and dust treatment. The filtration mechanism 3 adopts an inclined mounting track frame 31, in which the screening screen 32 is slidably connected. The tablets rely on their own gravity to slide down naturally to complete the filtration, without the need for an additional pushing structure. This greatly reduces the friction between the tablets and the screening screen 32, reducing the possibility of tablet breakage and additional dust generation, and ensuring efficient and stable filtration and separation. At the same time, the side plate 34 on the top of the screening screen 32 can prevent tablets from falling from the side, further improving the reliability of filtration. The negative pressure dust collection mechanism 5 generates negative pressure through the suction fan 51, and the suspended powder is adsorbed through the suction hopper 54. The dust filter screen 52 filters the air to avoid pollution, and the recycling drawer 53 facilitates the collection of powder for subsequent use, significantly improving the working environment.

[0034] During the application of this device, a storage device is installed at the top of the screening box 4, and a quantitative discharge device is installed at the bottom of the storage device. The storage device and the quantitative discharge device are existing technologies and can be directly adopted from the technical solutions proposed in the background art. During use, the amount discharged each time is the amount of one packaging bottle 26 through quantitative discharge. At the same time, an electrically controlled regulating valve can be installed at the output end of its discharge hopper to control the tablet discharge according to specific usage requirements. The electrically controlled valve is powered by a plug-in connector and socket. The specific application can be flexibly selected according to specific production needs. The above means are all existing technologies and therefore will not be described in detail here.

Claims

1. A packaging device for tablet production, characterized in that: Includes a base frame, a screening box is fixedly installed on the top of the base frame, a filter mechanism is fixedly installed inside the screening box, a packaging mechanism is fixedly installed on the top of the base frame at the output end of the filter mechanism, and a negative pressure dust collection mechanism is fixedly installed at the bottom inside the screening box; The filtration mechanism includes a mounting track frame, which is fixedly installed in the middle of the screening box. The mounting track frame is inclined as a whole. A screening screen plate is slidably connected inside the mounting track frame. The upper and lower ends of the screening screen plate pass through the mounting track frame. A limit component is fixedly installed at the upper end of the mounting track frame.

2. The packaging equipment for tablet production according to claim 1, characterized in that: A side plate is fixedly installed on the top of the screening screen plate, the side plate covers the input end of the mounting track frame, and a bridge-type handrail is fixedly installed on the outer side of the side plate.

3. The packaging equipment for tablet production according to claim 2, characterized in that: The lower end of the screening screen is fixedly installed with a discharge guide hopper, and the output end of the discharge guide hopper is located above the packaging mechanism.

4. The packaging equipment for tablet production according to claim 3, characterized in that: The packaging mechanism includes a fixed base, which is fixedly connected to the top side of the base frame. A drive motor is fixedly installed at the bottom of the fixed base. A rotating shaft is fixedly installed through the output end of the drive motor and at the top of the rotating shaft. A turntable is fixedly installed at the top of the turntable, and a placement seat is fixedly installed at equal intervals in a ring on the top of the placement seat. A packaging bottle is placed on the top of the placement seat.

5. The packaging equipment for tablet production according to claim 1, characterized in that: The limiting component includes a guide rail and a locking hole. The guide rail is fixedly installed on the upper end of the mounting track frame. Both ends of the guide rail are fixedly connected to limiting springs. A slider is fixedly installed on the outer end of the limiting spring. A limiting arm is fixedly connected to the outer side of the slider. The locking holes are opened on both sides of the upper end of the mounting track frame and the screening screen plate. The end of the limiting arm passes through the locking hole on the mounting track frame and is inserted into the locking hole of the screening screen plate.

6. The packaging equipment for tablet production according to claim 5, characterized in that: An adjusting push plate is fixedly connected to the outside of the slider, and the adjusting push plate is L-shaped in general.

7. The packaging equipment for tablet production according to claim 1, characterized in that: The negative pressure dust collection mechanism includes a suction fan and a collection drawer. The suction fan is fixedly installed in the top middle of the base frame. A suction hopper is fixedly installed at the input end of the suction fan. The input end of the suction hopper is connected to the inside of the screening box. The collection drawer is slidably connected to the lower end of the inside of the screening box. A groove is opened in the middle of the front of the screening box. A ventilation window is opened at the upper back of the screening box. A dust filter plate is fixedly installed inside the ventilation window. The dust filter plate is located directly in front of the input end of the suction hopper.