Ventilation device of tablet press and tablet press

Abstract

The present invention belongs to the technical field of tablet presses, and more particularly relates to a ventilation device for a tablet press and a tablet press. By providing a vent on the tablet press, the airflow function of a dust collector is utilized to drive the airflow in the drive cabin and the lower cabin of the tablet press, thereby achieving good heat dissipation and ventilation in the tablet press, reducing heat accumulation in the tablet press, and reducing the probability of component damage or defective product production due to high temperature. A temperature switch, a lower cabin air outlet door linked to the temperature switch, and a lower cabin air inlet door that can be opened and closed as needed are provided, so that the dust collector is used for internal ventilation and heat dissipation in the lower cabin of the tablet press only when the temperature is too high. When ventilation is not required, the lower cabin air inlet door and the lower cabin air outlet door are both closed, thereby maintaining the cleanliness of the environment inside the lower cabin of the tablet press as much as possible. A feed detection device is provided, which improves the yield rate by providing a proximity switch at the discharge pipe and linking an alarm to identify and alarm when insufficient material is present.

Description

Technical Field

[0001] The invention belongs to the technical field of tablet presses, and in particular relates to a ventilation device of a tablet press and the tablet press. Background Art

[0002] Tablet presses are primarily used in the pharmaceutical industry's tableting process. They are crucial equipment for pressing granules into tablets. Particles are loaded into punches and squeezed through the upper and lower punches to form tablets. Common tablet presses on the market have two 15-watt cooling fans built into their drive cabin, resulting in low heat dissipation efficiency. The lower compartment of the tablet press is the primary pressure point, housing numerous internal circuits and generating significant heat. To maintain internal cleanliness, ventilation channels are typically not provided, preventing heat dissipation. Typically, in a production workshop, a tablet press is placed in a tablet pressing room, which serves as a clean area. The workshop also includes a non-clean area, isolated from the clean area. A dust collector is installed in the non-clean area, connected via a pipe from the non-clean area to the clean area. The dust collector extracts air from the clean area for dust removal. Typically, the dust collector's pipes simply connect to the tablet pressing room, extracting air from the clean area, without improving the tablet press's heat dissipation.

[0003] Due to the above reasons, the tablet press generates a lot of heat during continuous production, the drive cabin dissipates heat slowly, and the heat in the lower cabin of the tablet press cannot be dissipated, which can easily cause the tablet press to overheat and its internal components to be easily damaged. When problems occur with the tablet press, it often leads to defective products or line shutdown for maintenance. Product quality cannot be continuously guaranteed and production efficiency is low.

[0004] In addition, the working process of the tablet press is to add the material into the feeding hopper, and the material in the feeding hopper enters the forced feeder through the high head difference. A discharge pipe is set between the feeding hopper and the forced feeder, and the rotating stirring paddle in the forced feeder forces the material to be added to the middle die hole. At the upper and lower pressing wheels, the upper and lower punches are pressurized by the pressing wheels to press the material in the middle die hole into sheets, completing the entire tableting process.

[0005] At present, in this process, a hopper window is provided on the hopper to observe whether the material in the hopper is adequately supplied. If the material in the hopper is insufficiently supplied, it is very easy to produce insufficient weight medicines, i.e. defective products. However, because some materials are sensitive to air humidity or have poor fluidity, it is easy for the hopper window to be blocked by medicine powder, and it is impossible to observe whether the material is insufficient in time. Moreover, because the material is sensitive to air humidity or has poor fluidity, it is easy for accumulation to form at the outlet of the hopper, resulting in insufficient feeding of the forced feeder and a high defect rate. Summary of the Invention

[0006] In view of the above deficiencies in the prior art, the present invention provides a ventilation device for a tablet press, which connects a dust collector to the tablet press, cleverly utilizing the dust collector to increase the heat dissipation of the tablet press, while also ensuring the environmental requirements of the lower cabin of the tablet pressing chamber, thereby improving the cooling effect, reducing the defect rate, and improving production efficiency. In addition, by arranging a proximity switch on the discharge pipe, an alarm is issued in time for insufficient material, thereby effectively reducing the defect rate.

[0007] The technical solution adopted by the present invention to solve the technical problem is:

[0008] The first part provides a feed detection device for a tablet press, comprising a proximity switch installed at the middle end of a discharge pipe, a through hole being provided on the side wall of the discharge pipe, the proximity switch passing through the through hole, the detection surface of the proximity switch being located inside the discharge pipe, the detection surface protruding 3 mm to 5 mm from the inner wall of the discharge pipe, the proximity switch being fixed on the side wall of the discharge pipe by a locking nut, the detection device also comprising an alarm, the alarm and the proximity switch being connected in series in the same circuit, the circuit also comprising a power supply, the power supply being provided by a battery or taken from the internal circuit of the tablet press; the bottom of the discharge pipe being connected to the inlet of a butterfly valve, the top of the discharge pipe being connected to the bottom of a feeding hopper, the outlet of the butterfly valve being connected to the inlet end of a forced feeder.

[0009] In existing tablet presses, the outlet of the hopper is connected to the inlet of the discharge pipe. When the material is sensitive to air humidity or has poor fluidity, it can easily accumulate at the hopper outlet, resulting in insufficient material in the discharge pipe. Insufficient material in the discharge pipe results in insufficient tablets, leading to defective products. The proximity switch, however, has its detection surface placed directly in the discharge pipe. A Balluff BES+516-131-S4-C inductive proximity switch with a detection distance of 4mm can be selected. When the discharge pipe is consistently full and flowing downward, the proximity switch does not operate. However, when material accumulates at the hopper outlet and the discharge pipe is insufficient or no material is falling, the proximity switch activates, connecting the circuit and sounding an alarm, prompting staff to shut down the machine, thereby stopping the production of defective products and minimizing the defect rate.

[0010] The existing tablet press can be a GZPK3555 tablet press in the GZPK3500 series rotary tablet press. The feeding hopper is set according to the space of the tablet pressing chamber, and its interface is connected to the feed port of the forced feeder and is consistent with the size of the forced feeder feed port, with a diameter of 7 cm and a distance of 25 cm.

[0011] The second part provides a ventilation device for a tablet press, wherein the ventilation device of the tablet press is connected to a dust collector, and the dust collector is isolated from the tablet press, and comprises a three-way valve, a first ventilation pipe, a lower cabin air inlet door, a lower cabin air outlet door and a second ventilation pipe, and two through holes are respectively provided on two mutually parallel side walls of the lower cabin of the tablet pressing cabin, and a lower cabin air inlet door and a lower cabin air outlet door are respectively provided at the two through holes, and the outer side wall of the through hole where the lower cabin air inlet door is located is covered with a filtering device to ensure that the air entering the lower cabin of the tablet pressing cabin from the lower cabin air inlet door is effectively filtered, and the lower cabin of the tablet pressing cabin is ensured to be clean. To ensure the cleanliness inside and ensure safety, the outlet end of the lower cabin air inlet door is suspended in the lower cabin of the tablet pressing cabin, the inlet end of the lower cabin air outlet door is arranged in the lower cabin of the tablet pressing cabin, the outlet end of the lower cabin air outlet door passes through the bulkhead of the lower cabin of the tablet pressing cabin and is connected with the head end of the first ventilation pipe arranged on the outside of the lower cabin of the tablet pressing cabin, the tail end of the first ventilation pipe is connected with the first end of the three-way valve, the second end of the three-way valve is connected with the driving cabin, the third end of the three-way valve is connected with the head end of the second ventilation pipe, and the tail end of the second ventilation pipe passes through the isolation wall and is connected with the air inlet of the dust collector.

[0012] By connecting the dust collector with the lower cabin of the tablet pressing cabin and the drive cabin, the suction force of the dust collector is cleverly utilized to increase the airflow in the drive cabin and the lower cabin of the tablet pressing cabin, thereby achieving good ventilation and heat dissipation effects of the tablet press, reducing the probability of damage to components of the tablet press due to high temperature or production of defective products, and improving production efficiency. At the same time, it does not cause any adverse effects on the negative pressure environment in the tablet pressing room where the tablet press is located.

[0013] Furthermore, the lower cabin air inlet door includes a horizontal tube A and a vertical tube A that are connected to each other. The horizontal tube A passes through the bulkhead of the lower cabin of the tableting cabin. The vertical tube A is arranged inside the lower cabin of the tableting cabin and has an opening facing upward. A hollow flat plate A is fixedly arranged in the vertical tube A perpendicular to its central axis. A support column A is fixed vertically in the center of the top of the flat plate A. The top of the support column A is lower than the vertical tube A, and a limiting boss is provided on the top of the support column A. The cross-sectional area of ​​the limiting boss is smaller than the cross-sectional area of ​​the vertical tube A. A rubber disc A is provided on the support column A so as to slide up and down. When the rubber disc A is located on the top of the flat plate A, it can cover all the hollow parts of the flat plate A.

[0014] Assume that when the dust collector creates negative pressure in the lower compartment of the tablet pressing chamber, the air pressure on the rubber disc A is F1, and the gravity of the rubber disc A is G1, then F1>G1.

[0015] Because vertical tube A opens upward and support column A is also vertical, when there's no negative pressure in the lower compartment of the tableting chamber, rubber disc A rests on top of flat plate A under the force of gravity, blocking the hollowed-out portion of flat plate A and closing the lower compartment air inlet door. When the dust collector operates and draws air, creating a negative pressure in the lower compartment, rubber disc A is lifted by the external air pressure and slides upward along support column A, opening the lower compartment air inlet door.

[0016] Furthermore, the lower cabin air outlet door includes a connected horizontal pipe B and a vertical pipe B, the head end of the horizontal pipe B is connected to the vertical pipe B, the tail end of the horizontal pipe B passes through the wall of the lower cabin of the tablet pressing cabin and is connected to the first ventilation pipe, the vertical pipe B is arranged inside the lower cabin of the tablet pressing cabin and is opened upward, the center of the vertical pipe B is fixedly provided with a hollow flat plate B perpendicular to its central axis, the top center of the flat plate B is fixedly provided with a support column B, the top of the vertical pipe B is provided with a suction cup electromagnet, the suction cup electromagnet is provided on the inner side wall of the lower cabin of the tablet pressing cabin through a bracket, the suction cup electromagnet is coaxial with the support column B and the ends of the two are against each other, and a rubber disc B is provided on the support column B to slide up and down. An iron plate is fixedly provided on the top of the rubber disc B. When the rubber disc B is located on the top of the flat plate B, it can cover all the hollow parts of the flat plate B. When the rubber disc B is located on the top of the flat plate B, the shortest distance between the top of the rubber disc B and the bottom of the suction cup electromagnet is 1 cm to 1.5 cm. A temperature switch is also provided in the lower compartment of the tablet pressing cabin. The model of the temperature switch can be an HKW9700 overheating protector. The temperature switch and the suction cup electromagnet are located in the same circuit. The circuit also includes a power supply. The power supply can be provided by a battery or taken from the circuit in the lower compartment of the tablet pressing cabin. The power supply is DC24V, which powers the suction cup electromagnet. The iron plate cooperates with the suction cup electromagnet to realize the opening and closing of the lower compartment air outlet door.

[0017] Assume that the suction force of the dust collector on the rubber disc B is F2, the suction force of the suction cup electromagnet on the iron plate is F3, and the gravity of the rubber disc B and the iron plate is G2, then F3>F2+G2. The outer side of the rubber disc B may not contact the inner side wall of the vertical tube B, so as to ensure that the rubber disc B encounters very little resistance when sliding up and down on the support column B. At the same time, a through hole is opened in the center of the rubber disc B, and a bearing B can be fixedly installed in the through hole. The bearing B is loosely sleeved on the support column B. The bearing B can be made of plastic to ensure that it is light in weight and easy to be lifted in a negative pressure environment. The temperature switch can be set in the center of the lower compartment of the tablet pressing compartment.

[0018] When the temperature switch senses that the temperature has reached a threshold and connects the circuit, the suction cup electromagnet is energized, attracting the iron plate and lifting the rubber disc, separating it from plate B and opening the lower compartment air outlet door. The suction cup electromagnet can be a DC suction cup electromagnet. The required suction cup electromagnet model can be selected by testing the suction force F2 provided by the dust collector outside the lower compartment air outlet door.

[0019] When the temperature switch conducts the circuit and opens the lower cabin air outlet door, the temperature in the lower cabin of the tablet pressing cabin can be effectively reduced. After the temperature drops, the lower cabin air outlet door is closed. After the lower cabin of the tablet pressing cabin has no negative pressure environment, its rubber disc A moves downward to the top of the flat plate A under the action of its own gravity, sealing the hollow part of the flat plate A and closing the lower cabin air inlet door. The lower cabin of the tablet pressing cabin is not connected to the outside world, ensuring the cleanliness of its internal environment.

[0020] Furthermore, a push switch is provided on the outer side wall of the lower compartment of the tablet pressing compartment, and the push switch is used to control the opening and closing of the circuit where the electromagnetic coil is located.

[0021] Furthermore, a trumpet-shaped air inlet is provided in the drive cabin, wherein the small-diameter end of the trumpet-shaped air inlet passes through the wall of the drive cabin and is connected to the second end of the three-way valve. The trumpet-shaped air inlet effectively expands the wind collection area in the drive cabin.

[0022] The specific usage process is: when the dust collector is turned on, the push switch is turned on and the tablet press starts to run. When the temperature switch detects that the temperature exceeds the action threshold, the temperature switch is turned on, the lower cabin air outlet door is opened, and a negative pressure environment is generated in the lower cabin of the tablet pressing cabin. The lower cabin air inlet door is opened, and the air in the lower cabin of the tablet pressing cabin circulates and the temperature decreases. When the temperature is lower than the threshold, the temperature switch disconnects the circuit, the lower cabin air outlet door is closed, and the lower cabin air inlet door is also closed. Good air circulation and good heat dissipation are always maintained in the drive cabin.

[0023] The third section provides a tablet press, comprising the feed detection device for the tablet press described in the first section and the ventilation device for the tablet press described in the second section. This tablet press can effectively and promptly detect defects and stop losses in a timely manner, and has a good ventilation structure, effectively reducing defects caused by high temperatures and significantly improving the yield rate.

[0024] The present invention has the following beneficial effects: the ventilation device of the tablet press is provided with a vent on the tablet press and is connected to the dust collector through a ventilation pipe, thereby utilizing the airflow driving function of the dust collector to drive the airflow in the drive cabin of the tablet press and the lower cabin of the tablet pressing cabin, and achieving good heat dissipation and ventilation in the tablet press without affecting the negative pressure environment in the tablet pressing chamber, thereby reducing heat accumulation in the tablet press, reducing the probability of damage to parts of the tablet press or production of defective products due to high temperature, and improving production efficiency; at the same time, the present invention is provided with a temperature switch, a lower cabin air outlet door linked to the temperature switch, and a lower cabin air inlet door that can be opened and closed as needed, so that the dust collector is used for internal ventilation and heat dissipation in the lower cabin of the tablet pressing cabin only when the temperature is too high, and when there is no ventilation, the lower cabin air inlet door and the lower cabin air outlet door are both closed, so as to maintain the airtightness of the lower cabin of the tablet pressing cabin to the greatest extent possible, thereby ensuring the safety of the internal parts of the lower cabin of the tablet pressing cabin and the cleanliness of the internal environment.

[0025] On the other hand, the feed detection device of the tablet press, by setting a proximity switch at the discharge pipe and linking an alarm to identify and alarm the insufficient material state, effectively improves the existing technology that is unable to timely detect the insufficient material state through the hopper window, and improves the yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structural connection between the embodiment provided by the present invention and a tablet press and a dust collector;

[0027] Figure 2 yes Figure 1 A schematic diagram of the structure of part A;

[0028] Figure 3 yes Figure 1 A schematic diagram of the structure of part B in the middle;

[0029] Figure 4 yes Figure 3 Schematic diagram of the top view of the middle plate B;

[0030] Figure 5 is a schematic diagram of the circuit where the electromagnetic coil and the temperature switch are located in the first embodiment;

[0031] Figure 6 1 is a schematic structural diagram of the unmodified tablet press in Example 1;

[0032] Figure 7 This is an enlarged schematic diagram of the proximity switch provided in the discharge pipe in the embodiment provided by the present invention;

[0033] In the figure: 1000, tablet press; 101, discharge pipe; 102, proximity switch; 1021, detection surface; 1022, locking nut; 103, feeding hopper; 104, butterfly valve; 105, forced feeder; 10, lower compartment of tablet pressing chamber; 111, existing tablet press; 20, drive compartment; 201, trumpet-shaped air inlet; 30, dust collector; 1, three-way valve; 11, first end; 12, second end; 13, third end; 2, first ventilation pipe; 3, lower compartment Air inlet door; 311. Horizontal pipe A; 312. Vertical pipe A; 313. Flat plate A; 314. Support column A; 315. Limiting boss; 316. Rubber disc A; 4. Lower cabin air outlet door; 411. Horizontal pipe B; 412. Vertical pipe B; 413. Flat plate B; 414. Support column B; 415. Iron plate; 416. Rubber disc B; 417. Suction cup electromagnet; 4171. Bracket; 418. Temperature switch; 5. Second ventilation duct; 6. Partition wall. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] Example 1:

[0036] like Figure 6 As shown, the existing tablet press 111 includes a tablet pressing cabin and a drive cabin, the tablet pressing cabin includes an upper tablet pressing cabin, a tablet discharge cabin and a lower tablet pressing cabin 10, the upper tablet pressing cabin includes a feeding hopper 103, the tablet discharge cabin includes a forced feeder 105, the feeding hopper 103 and the forced feeder 105 are connected through a discharge pipe 101, the lower tablet pressing cabin 10 is provided with a main pressure wheel and some lines, the drive cabin 20 is provided at the bottom of the lower tablet pressing cabin 10, and includes a turbine box and a motor inside.

[0037] The first part of the present invention provides a feeding detection device for a tablet press, such as Figure 7 As shown, it includes a proximity switch 102 installed at the middle end of the discharge pipe 101, a through hole is opened on the side wall of the discharge pipe 101, an internal thread can be set in the through hole, the proximity switch 102 passes through the through hole, and the outer wall of the proximity switch 102 can be provided with an external thread, the external thread of the proximity switch 102 is threadedly matched with the internal thread of the through hole, the detection surface 1021 of the proximity switch 102 is located in the discharge pipe 101, the detection surface 1021 protrudes from the inner wall of the discharge pipe 101 by 3mm~5mm, the proximity switch 102 is fixed to the side wall of the discharge pipe 101 by a locking nut 1022, the detection device also includes an alarm, the alarm and the proximity switch 102 are connected in series in the same circuit, the circuit also includes a power supply, and the power supply is provided by a battery or taken from the internal circuit of the tablet press;

[0038] The bottom of the discharge pipe 101 is connected to the inlet of the butterfly valve 104 , the top of the discharge pipe 101 is connected to the bottom of the feeding hopper 103 , and the outlet of the butterfly valve 104 is connected to the inlet end of the forced feeder 105 .

[0039] Existing tablet press 111, such as Figure 6 As shown, the outlet of hopper 103 is connected to the inlet of discharge pipe 101. When the material is sensitive to air humidity or has poor fluidity, it is easy to accumulate at the outlet of hopper 103, resulting in insufficient material in discharge pipe 101. When the material in discharge pipe 101 is insufficient, the tablets will be insufficient, resulting in defective products. The detection surface 1021 of proximity switch 102 is directly placed in discharge pipe 101. Proximity switch 102 can be a Balluff BES+516-131-S4-C inductive proximity switch with a detection distance of 4mm. When the material in discharge pipe 101 is always sufficient, continuously filled and flowing downward, proximity switch 102 does not operate. When the material accumulates at the outlet of hopper 103 and the material in discharge pipe 101 is insufficient or no material falls, proximity switch 102 operates, connecting the circuit, and the alarm sounds, prompting the staff to shut down the machine, thus stopping the production of defective products and minimizing the defect rate.

[0040] Existing tablet press 111 can be the GZPK3555 type tablet press in the GZPK3500 series rotary tablet press. Feeding hopper 103 is set according to the space of tabletting cabin, and its interface links to each other with the forced feeder inlet, and matches with the forced feeder inlet size, diameter 7cm, has the long distance of 25cm.

[0041] The feeding detection device of the tablet press sets a proximity switch at the discharge pipe and links it with an alarm to identify and alarm the insufficient material state, effectively improving the existing technology where the insufficient material state cannot be detected in time through the hopper window, thereby improving the yield rate.

[0042] The second part of the present invention provides a ventilation device for a tablet press, such as Figures 1 to 5As shown, the ventilation device of the tablet press is connected to the dust collector 30, and the dust collector 30 is isolated from the tablet press, including a three-way valve 1, a first ventilation pipe 2, a lower cabin air inlet door 3, a lower cabin air outlet door 4 and a second ventilation pipe 5. Two through holes are respectively provided on the two mutually parallel side walls of the lower cabin 10 of the tablet pressing cabin, and the two through holes are respectively provided with a lower cabin air inlet door 3 and a lower cabin air outlet door 4. The outer side wall of the through hole where the lower cabin air inlet door 3 is located is covered with a filtering device, which can be a combined high-efficiency filter of Beichang Junkong (Beijing) Technology Co., Ltd., model BK-18, and the specific size can be customized as needed, effectively filtering dust particles <0.5 microns, ensuring that dust particles entering the tablet press from the lower cabin air inlet door 3 are not filtered out. The air in the lower cabin 10 of the tablet cabin is effectively filtered to ensure the cleanliness and safety of the lower cabin 10 of the tablet cabin. The outlet end of the lower cabin air inlet door 3 is suspended in the lower cabin 10 of the tablet cabin, and the inlet end of the lower cabin air outlet door 4 is arranged in the lower cabin 10 of the tablet cabin. The outlet end of the lower cabin air outlet door 4 passes through the bulkhead of the lower cabin 10 of the tablet cabin and is connected with the head end of the first ventilation pipe 2 arranged on the outside of the lower cabin 10 of the tablet cabin. The tail end of the first ventilation pipe 2 is connected with the first end 11 of the three-way valve 1, the second end 12 of the three-way valve 1 is connected with the drive cabin 20, the third end 13 of the three-way valve 1 is connected with the head end of the second ventilation pipe 5, and the tail end of the second ventilation pipe 5 passes through the isolation wall 6 and is connected with the air inlet of the dust collector 30.

[0043] By connecting the dust collector 30 with the lower compartment 10 of the tablet pressing chamber and the drive compartment 20, the suction force of the dust collector 30 is cleverly utilized to increase the airflow in the drive compartment 20 and the lower compartment 10 of the tablet pressing chamber, thereby achieving good ventilation and heat dissipation effects of the tablet press, reducing the probability of damage to components of the tablet press 1000 or production of defective products due to high temperature, and improving production efficiency. At the same time, it does not cause any adverse effects on the negative pressure environment in the tablet pressing room where the tablet press 1000 is located.

[0044] The tablet press can be a GZPK3555 tablet press in the GZPK3500 series rotary tablet press. The present invention is an improvement on the structure of the known tablet press.

[0045] Furthermore, the lower cabin air inlet door 3 includes a connected horizontal pipe A311 and a vertical pipe A312, the horizontal pipe A311 passes through the bulkhead of the lower cabin 10 of the tabletting cabin, the vertical pipe A312 is arranged inside the lower cabin 10 of the tabletting cabin and has an opening facing upward, a hollow flat plate A313 is fixedly arranged in the vertical pipe A312 perpendicular to its central axis, a support column A314 is fixedly arranged vertically in the center of the top of the flat plate A313, the top of the support column A314 is lower than the vertical pipe A312, and a limiting boss 315 is provided on the top of the support column A314, the cross-sectional area of ​​the limiting boss 315 is smaller than the cross-sectional area of ​​the vertical pipe A312, a rubber disc A316 is provided on the support column A314 for sliding up and down, and when the rubber disc A316 is located on the top of the flat plate A313, it can cover all the hollow parts of the flat plate A313;

[0046] Assuming that the dust collector 30 creates a negative pressure in the lower chamber 10 of the tableting chamber, the air pressure on the rubber disc A316 is F1, and the weight of the rubber disc A316 is G1, then F1 > G1. A through-hole is provided in the center of the rubber disc A316, within which a bearing A is fixed. The bearing A is loosely fitted onto the support column A314. The bearing A can be made of plastic to ensure its lightness and ease of lifting in a negative pressure environment.

[0047] Because the vertical tube A312 opens upward and the support column A314 is also vertically arranged, when there is no negative pressure in the lower compartment 10 of the tablet pressing chamber, the rubber disc A316 will be positioned on top of the flat plate A313 under the action of gravity, blocking the hollow portion of the flat plate A313 and closing the lower compartment air inlet door 3. When the dust collector 30 is operating and inhaling air, a negative pressure environment is generated in the lower compartment 10 of the tablet pressing chamber. The rubber disc A316 is lifted by the external air pressure and slides upward along the support column A314, opening the lower compartment air inlet door 3.

[0048] Furthermore, the lower cabin air outlet door 4 includes a connected horizontal pipe B411 and a vertical pipe B412, the head end of the horizontal pipe B411 is connected to the vertical pipe B412, the tail end of the horizontal pipe B411 passes through the wall of the lower cabin 10 of the tablet pressing cabin and is connected to the first ventilation pipe 2, the vertical pipe B412 is arranged inside the lower cabin 10 of the tablet pressing cabin and the opening is arranged upward, the center of the vertical pipe B412 is fixedly provided with a hollow flat plate B413 perpendicular to its central axis, the top center of the flat plate B413 is fixedly provided with a support column B414, the top of the vertical pipe B412 is provided with a suction cup electromagnet 417, the suction cup electromagnet 417 is arranged on the inner side wall of the lower cabin 10 of the tablet pressing cabin through a bracket 4171, the suction cup electromagnet 417 and the support column B414 are coaxially arranged and the ends of the two are against each other, and a rubber disc B4 is provided on the support column B414 for sliding up and down. 16. An iron plate 415 is fixedly provided on the top of the rubber disc B416. When the rubber disc B416 is located on the top of the flat plate B413, it can cover all the hollow parts of the flat plate B413. When the rubber disc B416 is located on the top of the flat plate B413, the shortest distance between the top of the rubber disc B416 and the bottom of the suction cup type electromagnet 417 is 1 cm to 1.5 cm. A temperature switch 418 is also provided in the lower compartment 10 of the tablet pressing cabin. The model of the temperature switch 418 can be HKW9700 overheating protector. The temperature switch 418 and the suction cup type electromagnet 417 are located in the same circuit. The circuit also includes a power supply. The power supply can be provided by a battery or taken from the circuit in the lower compartment 10 of the tablet pressing cabin. The power supply is DC24V, which supplies power to the suction cup type electromagnet 417. The iron plate 415 cooperates with the suction cup type electromagnet 417 to realize the opening and closing of the lower compartment air outlet door 4.

[0049] Assume that the suction force of the dust collector 30 on the rubber disc B416 is F2, the suction force of the suction cup electromagnet 417 on the iron plate 415 is F3, and the gravity of the rubber disc B416 and the iron plate 415 is G2, then F3>F2+G2. The outer side of the rubber disc B416 may not contact the inner side wall of the vertical tube B412, so as to ensure that the rubber disc B416 encounters very little resistance when sliding up and down on the support column B414. At the same time, a through hole is opened in the center of the rubber disc B416, and a bearing B can be fixedly installed in the through hole. The bearing B is loosely sleeved on the support column B414. The bearing B can be made of plastic to ensure that it is light in weight and easy to be lifted in a negative pressure environment. The temperature switch 418 can be set in the center of the lower compartment 10 of the tablet pressing compartment.

[0050] When temperature switch 418 senses that the temperature has reached a threshold and connects the circuit, suction cup electromagnet 417 is energized, attracting iron plate 415 and lifting rubber disc B416, separating rubber disc B416 from flat plate B413 and opening lower compartment air outlet door 4. Suction cup electromagnet 417 can be a DC suction cup electromagnet. The required suction cup electromagnet model can be selected by testing the suction force F2 provided by dust collector 30 on the outer side of lower compartment air outlet door 4.

[0051] The model of the dust collector 30 may be ALJ-1.5 model of Qingdao Ailon Environmental Protection Technology Co., Ltd., the model of the suction cup electromagnet 417 may be CHZ-P30 / 22, and the diameter of the first ventilation pipe 2 may be 3 cm.

[0052] When the temperature switch 418 conducts the circuit and opens the lower cabin air outlet door 4, the temperature in the lower cabin 10 of the tablet pressing cabin can be effectively reduced, and the lower cabin air outlet door 4 can be closed after the temperature is reduced. After the lower cabin air inlet door 3 has no negative pressure environment in the lower cabin 10 of the tablet pressing cabin, its rubber disc A316 moves downward to the top of the flat plate A313 under the action of its own gravity, sealing the hollow part of the flat plate A313, closing the lower cabin air inlet door 3, and the lower cabin 10 of the tablet pressing cabin is not connected to the outside world, ensuring the cleanliness of its internal environment.

[0053] The specific circuit composition is as follows: The specific composition of the circuit where the suction cup type electromagnet 417 is located can be as shown in the attached figure Figure 5 As shown, the suction cup electromagnet 417 is connected in parallel with the diode D1, the cathode of the diode D1 is connected to the high potential terminal +Vcc, the cathode of the diode D1 is connected to the collector of the emitter transistor Q1, the base of the transistor Q1 is connected to one end of the push switch, the other end of the push switch is connected to one end of the protection resistor R, and the other end of the protection resistor R is connected to the high potential terminal +V O , the emitter of transistor Q1 is grounded. High potential +V O The power supply for the +Vcc terminal can be taken from the tablet press circuit.

[0054] Furthermore, a push switch is provided on the outer side wall of the tablet pressing chamber lower compartment 10, and the push switch is used to control the opening and closing of the circuit where the suction cup type electromagnet 417 is located.

[0055] Furthermore, a trumpet-shaped air inlet 201 is provided in the drive cabin 20, and the small-diameter end of the trumpet-shaped air inlet 201 passes through the wall of the drive cabin 20 and is connected to the second end of the three-way valve 1. The trumpet-shaped air inlet 201 effectively expands the wind collection area in the drive cabin.

[0056] The third aspect of the present invention provides a tablet press, comprising a feed detection device for the tablet press in the first aspect and a ventilation device for the tablet press in the second aspect. This tablet press can effectively and promptly detect defects and prevent losses. Furthermore, it has a well-designed ventilation structure, effectively reducing adverse conditions caused by high temperatures and significantly improving the yield rate.

[0057] The ventilation device of the tablet press is provided with a vent on the tablet press and is connected to the dust collector through a ventilation pipe, thereby utilizing the airflow driving function of the dust collector to drive the air flow in the drive cabin of the tablet press and the lower cabin of the tablet pressing cabin. Without affecting the negative pressure environment in the tablet pressing chamber, good heat dissipation and ventilation in the tablet press are achieved, heat accumulation in the tablet press is reduced, and the probability of damage to parts of the tablet press or production of defective products due to high temperature is reduced, thereby improving production efficiency. At the same time, the present invention provides a temperature switch, a lower cabin air outlet door linked to the temperature switch, and a lower cabin air inlet door that can be opened and closed as needed, so that the dust collector is used for internal ventilation and heat dissipation in the lower cabin of the tablet pressing cabin only when the temperature is too high. When there is no ventilation, the lower cabin air inlet door and the lower cabin air outlet door are both closed, so as to maintain the airtightness of the lower cabin of the tablet pressing cabin to the greatest extent possible, thereby ensuring the safety of the internal parts of the lower cabin of the tablet pressing cabin and the cleanliness of the internal environment.

[0058] The above descriptions are embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A ventilation device for a tablet press, wherein the ventilation device of the tablet press is connected to a dust collector, and the dust collector is isolated from the tablet press, characterized in that: The vents are connected to the air duct of the second ventilation duct and the air inlet of the second ventilation duct, and the vents are connected to the air duct of the second ventilation duct and the air inlet of the second ventilation duct. The lower cabin air inlet door includes a connected horizontal pipe A and a vertical pipe A, the horizontal pipe A passes through the bulkhead of the lower cabin of the tabletting cabin, the vertical pipe A is arranged inside the lower cabin of the tabletting cabin and has an opening facing upward, a hollow flat plate A is fixedly arranged in the vertical pipe A perpendicular to its central axis, a support column A is fixedly arranged vertically in the center of the top of the flat plate A, the top of the support column A is lower than the vertical pipe A, and a limiting boss is provided on the top of the support column A, the cross-sectional area of ​​the limiting boss is smaller than the cross-sectional area of ​​the vertical pipe A, a rubber disc A is provided on the support column A for sliding up and down, and when the rubber disc A is located on the top of the flat plate A, it can cover all hollow parts of the flat plate A; assuming that when the dust collector generates negative pressure in the lower cabin of the tabletting cabin, the air pressure on the rubber disc A is F1, and the gravity of the rubber disc A is G1, then F1>G1; The lower cabin air outlet door includes a connected horizontal pipe B and a vertical pipe B, the head end of the horizontal pipe B is connected to the vertical pipe B, the tail end of the horizontal pipe B passes through the bulkhead of the lower cabin of the tablet pressing cabin and is connected to the first ventilation pipe, the vertical pipe B is arranged inside the lower cabin of the tablet pressing cabin and is opened upward, the center of the vertical pipe B is fixedly provided with a hollow flat plate B perpendicular to its central axis, the top center of the flat plate B is fixedly provided with a support column B, the top of the vertical pipe B is provided with a suction cup electromagnet, the suction cup electromagnet is provided with the inner side wall of the lower cabin of the tablet pressing cabin through a bracket, the suction cup electromagnet is coaxially arranged with the support column B and the ends of the two are against each other, a rubber disc B is provided on the support column B for sliding up and down, the top of the rubber disc B is fixed with an iron plate, and when the rubber disc B is located on the flat plate B When the rubber disc B is at the top, it can cover all the hollow parts of the flat plate B. When the rubber disc B is at the top of the flat plate B, the shortest distance between the top of the rubber disc B and the bottom of the suction cup electromagnet is 1 cm~1.5 cm. A temperature switch is also provided in the lower cabin of the pressing cabin. The temperature switch and the suction cup electromagnet are located in the same circuit. The circuit also includes a power supply, which supplies power to the suction cup electromagnet. The iron plate cooperates with the suction cup electromagnet to realize the opening and closing of the air outlet door of the lower cabin. Assuming that the suction force of the dust collector on the rubber disc B is F2, the suction force of the suction cup electromagnet on the iron plate is F3, and the gravity of the rubber disc B and the iron plate is G2, then F3>F2+G2; a through hole is opened in the center of the rubber disc B, and a bearing B is fixedly provided in the through hole, and the bearing B is loosely sleeved on the support column B.

2. The ventilation device of the tablet press according to claim 1, characterized in that: A push switch is also provided on the outer side wall of the lower compartment of the tablet pressing compartment, and the push switch is used to control the opening and closing of the circuit where the electromagnetic coil is located.

3. The ventilation device of the tablet press according to claim 2, characterized in that: A trumpet-shaped air inlet is provided in the cabin of the driving cabin, and the small-diameter end of the trumpet-shaped air inlet passes through the cabin wall of the driving cabin and is connected with the second end of the three-way valve.

4. A tablet press, characterized in that: The tablet press comprises the ventilation device of the tablet press according to any one of claims 1 to 3.

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