Low-temperature crushing device for medicine powder preparation

Abstract

The low-temperature smashing device comprises a base, a filtering tank and a low-temperature medium adding mechanism, four movable supporting mechanisms are arranged at the top of the base, a supporting frame is movably installed at the tops of the four movable supporting mechanisms, and the inner side of the top end of the supporting frame is rotationally connected with a supporting shaft frame in a sleeving mode; along with crushing, the superfine powder flies, a low-temperature-resistant specially-made Roots vacuum pump extraction pipe extracts gas in the filter tank to form negative pressure, gas in a hollow pipe is extracted through a flexible introduction pipe, airflow and the superfine powder enter the flexible introduction pipe through the hollow pipe under flow guide of air holes, and then the superfine powder enters the filter tank through the flexible introduction pipe. Air flow and micro powder are separated through the low-temperature dust filtering cloth bag, a butterfly weight stack and a flexible spring shake under the action of the air flow, the low-temperature dust filtering cloth bag is promoted to shake through shaking of a flexible connecting column, and the micro powder is guided into a sealed collecting box through sliding of a discharging collecting pipe.

Description

Technical Field

[0001] The invention relates to the technical field of medicine powder processing and pulverization, in particular to a low-temperature pulverization device for preparing medicine powder. Background Art

[0002] Pharmaceutical powders are solid particles formed by the crushing of drugs. They have a wide range of uniform particle sizes and must meet requirements such as purity, fluidity, stability, and safety. They are widely used in the production of various preparations. During the processing, it is necessary to control the crushing environment, select suitable filter materials, and ensure the particle size through screening. The types of pharmaceutical powders can be divided from different dimensions: according to the source of raw materials, there are traditional Chinese medicine powders (such as Panax notoginseng powder and Astragalus powder made by crushing traditional Chinese medicine), chemical powders, and biological drug powders (such as powders made by freeze-drying of protein and polypeptide biological preparations); according to particle size, they can be divided into coarse powder, medium powder, fine powder, and ultrafine powder, etc. Different particle sizes are suitable for different preparation types (such as coarse powder can be used for decoction, and fine powder is often used as raw material for powders or tablets); according to purpose, there are powders used directly in clinical practice and powders used as preparation intermediates.

[0003] During the processing of some drugs, many are sensitive to temperature. High temperatures can cause them to oxidize, degrade, or inactivate. Low-temperature pulverization can lower the material temperature, reduce the heat generated by mechanical friction during the pulverization process, avoid the destruction of active ingredients, and thus preserve the drug's efficacy. Some drugs are soft and sticky at room temperature and easily adhere to the pulverization equipment, making them difficult to pulverize into fine powders and resulting in uneven particle size. Low-temperature environments can increase the brittleness and hardness of the materials, reduce their plasticity and stickiness, and make them easier to pulverize into fine particles with a more uniform particle size distribution. In the process of low-temperature pulverization of drugs, low-temperature nitrogen or dry ice is often used as the low-temperature medium. These media may leak during the processing process, thereby affecting the oxygen concentration in the processing environment and posing certain risks. In addition, traditional pulverization devices are mostly fixed and cannot adjust the processing and pulverization inclination angles as needed, thus affecting pulverization efficiency. In addition, during the pulverization process, some drugs that are pre-pulverized into fine powders will float with the airflow. If they are discharged directly after pulverization, they will drift, making it difficult to remove and screen the suspended powder. Based on this, a low-temperature pulverization device for drug powder preparation is proposed. Summary of the Invention

[0004] The object of the present invention is to provide a low-temperature pulverizing device for preparing medicinal powder to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a low-temperature pulverizing device for preparing drug powder, comprising a base, a filter tank and a low-temperature medium adding mechanism, four groups of movable support mechanisms are provided on the top of the base, and the tops of the four groups of movable support mechanisms are movably installed with support frames, the inner side of the top of the support frame is rotatably sleeved with a support shaft frame, and the opposite side of the support shaft frame is fixedly installed with a pulverizing tank, the bottoms of both ends of the pulverizing tank are provided with hydraulic jacking mechanisms, the inside of the side walls of the pulverizing tank is fixedly installed with a heat insulation layer, the outside of the bottom end of the pulverizing tank is fixedly installed with two storage barrels, the tops of the two storage barrels are fixedly installed with powder filters, the two ends of the two storage barrels are connected with discharge pipes, the inside of the discharge pipes is provided with a discharge valve, and the pulverizing tank The top is connected to a feeding cylinder, and a movable sealing cover is movably sealed on the top of the feeding cylinder, a first guide cone is fixedly installed on one end of the inner wall of the crushing tank, and a sealed bearing 2 is embedded in the interior of one end of the first guide cone, and a hollow tube is sleeved on the inner side of the sealed bearing 2, and a plurality of air holes are provided on the side wall of the hollow tube, and a plurality of groups of crushing knives are fixedly installed on the outside of the hollow tube, and a paddle is fixedly installed on the opposite side of the crushing knife away from one end of the hollow tube, and a plurality of triangular limit members are fixedly installed on the inner wall of the crushing tank, and a plurality of crushing tooth grooves are provided on both sides of the triangular limit members, and a second guide cone is movably sleeved on the outside of the hollow tube away from one end of the first guide cone, and a support bearing is sleeved on the outside of one end of the hollow tube, and a power mechanism is provided on the outside of the hollow tube.

[0006] The top of the filter tank is sealed with a top sealing cover by bolts, and the top of the top sealing cover is connected to a flexible inlet pipe, and the outer side of the flexible inlet pipe away from one end of the top sealing cover is sleeved with several sealing bearings, the outer side of the flexible inlet pipe is fixedly sleeved with an outer sealing sleeve, and the outer side of the flexible inlet pipe is fixedly sleeved with a sealing cone, the inner wall of the filter tank is fixedly installed with a mounting bracket, the top of the mounting bracket is installed with a low-temperature dust filter bag, the bottom end of the low-temperature dust filter bag is connected to an exhaust collection pipe, and several flexible connecting columns are fixedly installed on the outer side of the bottom end of the low-temperature dust filter bag, and a flexible spring is fixedly installed on the outer side of the flexible connecting column, and a butterfly counterweight is fixedly installed on the outer side of the flexible spring, the exhaust collection pipe is fixedly passed through the filter tank and extends to the bottom of the filter tank, the other end of the exhaust collection pipe is connected to a sealed collection box, and the outside of the filter tank is connected to an airflow circulation mechanism.

[0007] The airflow circulation mechanism includes a special low-temperature resistant Roots vacuum pump, the output end of the special low-temperature resistant Roots vacuum pump is connected to a return pipe, the end of the return pipe away from the special low-temperature resistant Roots vacuum pump is connected to a middle flexible connecting pipe, the outer side of the return pipe adjacent to the end of the special low-temperature resistant Roots vacuum pump is connected to a discharge pipe, the interiors of the return pipe and the discharge pipe are both provided with special low-temperature resistant solenoid valves, and the input end of the special low-temperature resistant Roots vacuum pump is connected to an extraction pipe.

[0008] Preferably, the four groups of movable support mechanisms are rectangular and symmetrically distributed on the top of the base, and the number of the movable support mechanisms in a group is two, and the two movable support mechanisms each include a slide groove 1, the slide groove 1 is opened on the top of the base, a slider 1 is slidably installed on the inner side of the slide groove 1, a slide rod 1 is movably sleeved through the interior of the slider 1, both ends of the slide rod 1 are fixedly installed on the inner wall of the slide groove 1, a slide column is fixedly installed on the top of the slider 1, and a return spring is sleeved on the outer side of the slide column, the slide column movably passes through the support frame and extends to the top surface of the bottom end of the support frame, the top end of the return spring is fixedly installed on the top end of the slide column, and the bottom end of the return spring is fixedly installed on the top surface of the bottom end of the support frame.

[0009] Preferably, the hydraulic jacking mechanism is axially symmetrically distributed at both ends of the crushing tank, and the hydraulic jacking mechanism includes a hydraulic telescopic column and a second slide. The output end of the hydraulic telescopic column is fixedly installed with a collar, and the inner side of the collar is rotatably sleeved with a rotating frame. The top of the rotating frame is fixedly installed on the outer side of the crushing tank, and the bottom end of the hydraulic telescopic column is fixedly installed with a second slider, and the inner side of the second slider is penetrated and sleeved with a second slide rod, and the two ends of the second slide rod are fixedly installed on the inner wall of the second slide, and the second slide is opened at the top of the base.

[0010] Preferably, the two storage barrels are symmetrically and evenly distributed at the bottom of the crushing tank, and both storage barrels pass through the crushing tank and the thermal insulation layer and extend to the inner wall of the crushing tank. The powder filter is located on the inner side of the crushing tank, and the powder filter is flush with the inner wall of the crushing tank. The powder filter is made of austenitic stainless steel.

[0011] Preferably, the air holes are linearly and evenly distributed on the side wall of the hollow tube, the crushing knives are circumferentially and evenly distributed on the outside of the hollow tube, the crushing knives are linearly and evenly distributed on the opposite sides of the triangular limiter, the triangular limiter is linearly and evenly distributed on the inner wall of the crushing tank, the opposite ends of the triangular limiter are movably sleeved on the outside of the hollow tube, the crushing tooth grooves are linearly and evenly distributed on both sides of the triangular limiter, the cross-section of the triangular limiter is triangular, the two sides of the triangular limiter correspond to the outside of the crushing knives, and the triangular limiter and the crushing knives are linearly staggered and evenly distributed.

[0012] Preferably, the second guide cone is fixedly mounted on the inner wall of one end of the crushing tank, the support bearing passes through the crushing tank and extends to the outside of the crushing tank, the second guide cone is movably sleeved on the outside of the hollow tube and the support bearing, one end of the hollow tube extends to the outside of the crushing tank, the power mechanism includes a reduction servo motor, the reduction servo motor is fixedly mounted on the outside of the crushing tank, the output end of the reduction servo motor is transmission-connected with a driving gear, the outer side of the driving gear is meshed with a driven gear ring, the driven gear ring is fixedly sleeved on the outside of the hollow tube, the sealing bearings are linearly and evenly distributed on the opposite sides of the hollow tube and the flexible inlet tube, one end of the outer sealing sleeve is movably sleeved on the outer end of the hollow tube, and the outer side of the sealing cone is movably sleeved on the inner wall of the hollow tube.

[0013] Preferably, the low-temperature dust filter bag is made of polytetrafluoroethylene filter cloth, the flexible inlet pipe and the middle flexible connecting pipe are both flexible in the middle and rigid at both ends, the flexible parts of the flexible inlet pipe and the middle flexible connecting pipe are made of ultra-high molecular weight polyethylene, high-strength fiber braided layer and aging-resistant rubber composite, the ultra-high molecular weight polyethylene is located in the innermost layer, and the high-strength fiber braided layer is located on the outside of the ultra-high molecular weight polyethylene, the aging-resistant rubber is located on the outside of the high-strength fiber braided layer, the diameter range of the flexible inlet pipe and the middle flexible connecting pipe is φ10mm-50mm, the material of the flexible connecting column is silicone rubber, the end of the flexible spring away from the flexible connecting column is fixedly installed on the inner wall of the filter tank, the butterfly counterweight plate is butterfly-shaped and the counterweights at both ends are uneven, and the filter tank and the mounting frame are both made of austenitic stainless steel.

[0014] Preferably, the special low-temperature resistant Roots vacuum pump is fixedly installed on the outer wall of the filter tank, the extraction pipe is fixedly passed through the filter tank and extends to the bottom of the inner cavity of the filter tank, the end of the discharge pipe away from the return pipe is fixedly installed with a threaded connector, the outer side of the middle flexible connecting pipe away from the end of the return pipe is sleeved with a sealing bearing three, the sealing bearing three is sleeved inside the hollow tube, and a sealing sleeve is provided on one side of the sealing bearing three, and the special low-temperature resistant solenoid valve is a deep low-temperature solenoid valve.

[0015] Preferably, the low-temperature medium adding mechanism includes a Dewar tank, the top of the Dewar tank is connected to an input pipe, the input pipe is connected to the Dewar tank by a special bayonet joint, the other end of the input pipe is connected to a conveying mechanism, the output end guide pipe of the conveying mechanism, the bottom of the guide pipe is connected to a plurality of connecting pipes, the connecting pipes are linearly and evenly distributed at the bottom of the guide pipe, the bottom end of the connecting pipe is fixedly passed through the crushing tank and extends to the top of the inner cavity of the crushing tank, the bottom end of the connecting pipe is connected to a jet nozzle, the conveying mechanism adopts a special low-temperature liquid nitrogen pump, and the guide pipe, connecting pipe and jet nozzle are all made of Austrian stainless steel.

[0016] Preferably, the top of the crushing tank is connected to a pressure relief valve, one end of the crushing tank is installed with a control panel, and one side of the first guide cone is installed with a platinum resistance temperature sensor.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When the device is in use, the operator opens the movable sealing cover to put the raw materials to be crushed into the interior of the crushing tank, and after closing the movable sealing cover, the low-temperature medium is introduced into the interior of the crushing tank through the low-temperature medium adding mechanism. After the crushing temperature is reached, the power mechanism accelerates and drives the hollow tube to rotate, and the hollow tube drives the crushing knife to rotate. The paddle gradually pries up the raw materials, and the raw materials are mechanically crushed by the shear force between the crushing knife and the triangular limiter. As the crushing proceeds, the raw materials that meet the size pass through the powder filter and enter the internal storage of the storage barrel. After the operation is completed, the discharge valve is opened to collect the powder through the discharge pipe. When the discharge is not smooth, air pressure can be introduced through the discharge pipe at one end or the crushing tank can be tilted to discharge the powder.

[0018] 2. As the crushing progresses, the extremely fine powder inside the crushing tank will float. At this time, the special low-temperature resistant Roots vacuum pump is started, and the extraction pipe extracts the gas inside the filter tank to form negative pressure, and the gas inside the hollow tube is extracted through the flexible inlet pipe. The airflow and fine powder enter the flexible inlet pipe through the hollow pipe under the guidance of the air vents. The airflow passes through the low-temperature dust filter bag to separate the airflow and the fine powder. The butterfly counterweight and the flexible spring shake under the action of the airflow, and the low-temperature dust filter bag is caused to shake by the shaking of the flexible connecting column, so that the fine powder filtered by the low-temperature dust filter bag slides through the discharge collection pipe and is guided into the interior of the sealed collection box. It is pumped into the interior of the hollow tube through the middle flexible connecting pipe, forming an airflow circulation, and filtering and collecting the suspended fine powder inside the crushing tank, thereby collecting the extremely fine powder, reducing the suspension in the airflow, facilitating collection and airflow circulation, reducing the overflow of the low-temperature medium, and increasing the safety and efficiency of the operation.

[0019] 3. When the crushing pot is tilted, the two ends of the crushing pot are tilted respectively under the rotation support of the support shaft frame, and the raised end of the crushing pot lifts the support shaft frame and the support frame, and the bottom end of the support shaft frame slides upward on the outside of the sliding column and applies a lateral movement force to the sliding column, and the slider moves under the limit of the slide rod 1 and the slide groove 1, which can provide support and movement when the support frame changes in height. The support of the movable support mechanism structure allows both ends of the crushing pot to be lifted and tilted, and the tilt of the crushing pot facilitates the tilt of the raw materials inside, which can assist in the diversion of the raw materials inside, thereby assisting in crushing, avoiding the accumulation of raw materials, and increasing the effect of dynamic crushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the front three-dimensional appearance structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the rear-view stereoscopic appearance structure of the present invention.

[0022] Figure 3 It is a front cross-sectional schematic diagram of the internal structure of the present invention.

[0023] Figure 4 It is a schematic diagram of the internal structure of the present invention from the right side.

[0024] Figure 5 It is a schematic diagram of the left side sectional structure of the present invention.

[0025] Figure 6 For the present invention Figure 1 Enlarged structural diagram at point A in the middle.

[0026] Figure 7 For the present invention Figure 3 Enlarged structural diagram at point B in the middle.

[0027] Figure 8 For the present invention Figure 3 Enlarged structural diagram at point C in the middle.

[0028] Figure 9 For the present invention Figure 3 Enlarged structural diagram at point D in the middle.

[0029] Figure 10 For the present invention Figure 3 Enlarged structural diagram at E in the middle.

[0030] Figure 11 For the present invention Figure 4 Enlarged structural diagram at F in the middle.

[0031] Figure 12 For the present invention Figure 5 Enlarged structural diagram at G in the middle.

[0032] Figure: 1, base; 2, filter canister; 201, discharge collection pipe; 202, sealed collection box; 203, flexible inlet pipe; 204, mounting frame; 205, low-temperature dust filter bag; 206, flexible spring; 207, flexible connecting column; 208, butterfly weight plate; 209, top sealing cover; 210, outer sealing sleeve; 3, crushing canister; 301, pressure relief valve; 302, storage barrel; 303, discharge pipe; 304, discharge valve; 305, powder filter; 3 06. First guide cone; 307. Second guide cone; 308. Thermal insulation layer; 309. Hollow tube; 310. Triangular stopper; 311. Sealed bearing 1; 312. Sealed cone 1; 313. Air vent; 314. Crushing tooth groove; 315. Crushing knife; 316. Support bearing; 317. Sealed bearing 2; 318. Paddle; 319. Platinum resistance temperature sensor; 4. Low-temperature medium adding mechanism; 401. Dewar tank; 402. Inlet pipe; 40 3. Conveying mechanism; 404. Diversion pipe; 405. Connecting pipe; 406. Nozzle; 5. Control panel; 6. Support frame; 601. Support shaft frame; 7. Feeding barrel; 701. Movable sealing cover; 8. Movable support mechanism; 801. Chute 1; 802. Slide bar 1; 803. Slider 1; 804. Slide column; 805. Return spring; 9. Hydraulic lifting mechanism; 901. Hydraulic telescopic column; 902. Rotating frame; 903. Chute 2; 904. Slide bar 2; 905, slider 2; 906, collar; 10, air circulation mechanism; 1001, return pipe; 1002, special low-temperature resistant solenoid valve; 1003, discharge pipe; 1004, special low-temperature resistant Roots vacuum pump; 1005, extraction pipe; 1006, sealed bearing 3; 1007, middle flexible connecting pipe; 1008, threaded connector; 11, power mechanism; 1101, reduction servo motor; 1102, driving gear; 1103, driven gear ring. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figures 1-12The present invention provides a technical solution: a low-temperature pulverizing device for preparing medicinal powder, comprising a base 1, a filter tank 2 and a low-temperature medium adding mechanism 4, four groups of movable supporting mechanisms 8 are provided on the top of the base 1, and a support frame 6 is movably installed on the top of the four groups of movable supporting mechanisms 8, and a support shaft frame 601 is rotatably sleeved on the inner side of the top of the support frame 6, and a crushing tank 3 is fixedly installed on the opposite side of the support shaft frame 601, and a hydraulic jacking mechanism 9 is provided at the bottom of both ends of the crushing tank 3, and a heat insulation layer 308 is fixedly installed inside the side wall of the crushing tank 3, and two storage barrels 302 are fixedly installed on the outer side of the bottom end of the crushing tank 3, and a powder filter screen 305 is fixedly installed on the top of the two storage barrels 302, and both ends of the two storage barrels 302 are connected with a discharge pipe 303, and a discharge valve 304 is provided inside the discharge pipe 303, and the top of the crushing tank 3 is connected with a feeding barrel 7, and the top of the feeding barrel 7 is fixedly mounted on the outer side of the bottom end of the crushing tank 3. A movable sealing cover 701 is installed on the movable seal of the part, a first guide cone 306 is fixedly installed on one end of the inner wall of the crushing tank 3, a sealed bearing 2 317 is embedded in the interior of one end of the first guide cone 306, a hollow tube 309 is sleeved on the inner side of the sealed bearing 2 317, a plurality of air holes 313 are provided on the side wall of the hollow tube 309, a plurality of groups of crushing knives 315 are fixedly installed on the outer side of the hollow tube 309, a dial plate 318 is fixedly installed on the opposite side of the crushing knife 315 away from one end of the hollow tube 309, a plurality of triangular limiting members 310 are fixedly installed on the inner wall of the crushing tank 3, a plurality of crushing tooth grooves 314 are provided on both sides of the triangular limiting member 310, a second guide cone 307 is movably sleeved on the outer side of the end of the hollow tube 309 away from the first guide cone 306, a support bearing 316 is sleeved on the outer side of one end of the hollow tube 309, and a power mechanism 11 is provided on the outer side of the hollow tube 309.

[0035] The top of the filter tank 2 is sealed with a top sealing cover 209 by bolts. The top of the top sealing cover 209 is connected to the flexible introduction pipe 203. The outer side of the flexible introduction pipe 203 away from the top sealing cover 209 is sleeved with a plurality of sealing bearings 311. The outer side of the flexible introduction pipe 203 is fixedly sleeved with an outer sealing sleeve 210. The outer side of the flexible introduction pipe 203 is fixedly sleeved with a sealing cone 312. The inner wall of the filter tank 2 is fixedly installed with a mounting frame 204. The top of the mounting frame 204 is installed with a low-temperature dust filter bag 205. The bottom end of the low-temperature dust filter bag 205 is connected to the discharge collection pipe 201, and a number of flexible connecting columns 207 are fixedly installed on the outside of the bottom end of the low-temperature dust filter bag 205. A flexible spring 206 is fixedly installed on the outside of the flexible connecting column 207, and a butterfly counterweight plate 208 is fixedly installed on the outside of the flexible spring 206. The discharge collection pipe 201 is fixedly passed through the filter tank 2 and extends to the bottom of the filter tank 2. The other end of the discharge collection pipe 201 is connected to the sealed collection box 202, and the outside of the filter tank 2 is connected to the airflow circulation mechanism 10.

[0036] The airflow circulation mechanism 10 includes a special low-temperature resistant Roots vacuum pump 1004, the output end of the special low-temperature resistant Roots vacuum pump 1004 is connected to a return pipe 1001, the end of the return pipe 1001 away from the special low-temperature resistant Roots vacuum pump 1004 is connected to a middle flexible connecting pipe 1007, the outer side of the return pipe 1001 near the end of the special low-temperature resistant Roots vacuum pump 1004 is connected to a discharge pipe 1003, and the interior of the return pipe 1001 and the discharge pipe 1003 are both provided with a special low-temperature resistant solenoid valve 1002, and the input end of the special low-temperature resistant Roots vacuum pump 1004 is connected to an extraction pipe 1005.

[0037] The working principle of the above technical solution is as follows: when in use, the operator opens the movable sealing cover 701 to put the raw materials to be crushed into the interior of the crushing tank 3, and after closing the movable sealing cover 701, the low-temperature medium is introduced into the interior of the crushing tank 3 through the low-temperature medium adding mechanism 4, and then the power mechanism 11 slowly rotates to cause the hollow tube 309 to rotate, and the raw materials are moved by the crushing knife 315 and the paddle 318, so that the low-temperature medium gradually cools the interior of the crushing tank 3 and the raw materials, and after reaching the crushing temperature, the power mechanism 11 accelerates the rotation and drives the hollow tube 309 to rotate, and the hollow tube 309 drives the crushing knife 315 and the paddle 318. 5 rotates, the paddle 318 gradually pries up the raw materials, and the raw materials are mechanically crushed by the shear force between the crushing knife 315 and the triangular limiter 310. As the crushing progresses, the raw materials that meet the size pass through the powder filter 305 and enter the internal storage of the storage barrel 302. After the operation is completed, the discharge valve 304 is opened and the discharge pipe 303 is collected. If the discharge is not smooth, air pressure can be introduced through the discharge pipe 303 at one end or the crushing tank 3 can be tilted to discharge the powder. As the crushing progresses, the extremely fine powder inside the crushing tank 3 will float. At this time, the special low-temperature resistant Roots vacuum pump 1004 is started, and the extraction pipe 1005 is used to remove the filter tank. 2 is extracted to form a negative pressure, and the gas inside the hollow tube 309 is extracted through the flexible introduction tube 203. The airflow and fine powder enter the flexible introduction tube 203 through the hollow tube 309 under the guidance of the air vent 313. The flexible introduction tube 203 and the hollow tube 309 are supported by a sealing bearing 311. The airflow enters the filter canister 2 through the guidance of the flexible introduction tube 203. The airflow passes through the low-temperature dust filter bag 205 to separate the airflow and fine powder. Then, the butterfly weight plate 208 and the flexible spring 206 are shaken under the action of the airflow, and the low-temperature dust filter bag is shaken through the flexible connecting column 207. 205 shakes, so that the fine powder filtered by the low-temperature dust filter bag 205 slides down and is guided into the inside of the sealed collection box 202 through the discharge collection pipe 201, and then the low-temperature resistant special Roots vacuum pump 1004 pumps the air through the return pipe 1001 to the inside of the middle flexible connecting pipe 1007, and is pumped into the inside of the hollow tube 309 through the middle flexible connecting pipe 1007, forming an air circulation, and filtering and collecting the suspended fine powder inside the crushing tank 3, playing the role of collecting extremely fine powder, reducing suspension in the air flow, facilitating collection and air circulation, reducing overflow of the low-temperature medium, and increasing the safety and efficiency of the operation.

[0038] In another embodiment, Figures 1-12As shown, four groups of movable support mechanisms 8 are symmetrically distributed in a rectangular shape on the top of the base 1. The number of the movable support mechanisms 8 is two in a group. The two movable support mechanisms 8 each include a slide groove 801. The slide groove 801 is opened on the top of the base 1. A slider 803 is slidably installed on the inner side of the slide groove 801. The interior of the slider 803 is movably sleeved with a slide rod 802. Both ends of the slide rod 802 are fixedly installed on the inner wall of the slide groove 801. A slide column 804 is fixedly installed on the top of the slider 803. A return spring 805 is sleeved on the outer side of the slide column 804. The slide column 804 movably passes through the support frame 6 and extends to the top surface of the bottom end of the support frame 6. The top end of the return spring 805 is fixedly installed on the top end of the slide column 804, and the bottom end of the return spring 805 is fixedly installed on the top surface of the bottom end of the support frame 6.

[0039] When the crushing pot 3 is tilted, the two ends of the crushing pot 3 are tilted respectively under the rotation support of the support shaft frame 601, and the raised end of the crushing pot 3 is lifted by the support shaft frame 601 and the support frame 6, at this time the return spring 805 is compressed, and the bottom end of the support shaft frame 601 slides upward on the outside of the slide column 804 and applies a lateral movement force to the slide column 804, and the slider 803 moves under the limit of the slide rod 802 and the slide groove 801, thereby playing a sliding support role for the support shaft frame 601, and can provide support and movement when the support frame 6 changes in height. The support of the movable support mechanism 8 structure allows both ends of the crushing pot 3 to be lifted and tilted, which is convenient for the crushing pot 3 to be tilted and supported, and the tilting of the crushing pot 3 facilitates the tilting of the raw materials inside, which can assist in the diversion of the raw materials inside, thereby assisting in crushing, avoiding the accumulation of raw materials, and increasing the effect of dynamic crushing.

[0040] In another embodiment, Figures 1-12 As shown, the hydraulic jacking mechanism 9 is evenly distributed at both ends of the crushing tank 3 in an axially symmetrical manner. The hydraulic jacking mechanism 9 includes a hydraulic telescopic column 901 and a second slide 903. The output end of the hydraulic telescopic column 901 is fixedly installed with a collar 906, and the inner side of the collar 906 is rotatably sleeved with a rotating frame 902. The top of the rotating frame 902 is fixedly installed on the outer side of the crushing tank 3. The bottom end of the hydraulic telescopic column 901 is fixedly installed with a second slider 905, and the inner side of the second slider 905 is penetrated and sleeved with a second slide rod 904. The two ends of the second slide rod 904 are fixedly installed on the inner wall of the second slide 903, and the second slide 903 is opened at the top of the base 1.

[0041] When one end of the crushing tank 3 needs to be lifted and tilted, the hydraulic telescopic column 901 extends out and pushes the ring 906 and the rotating frame 902 to lift up. The rotating frame 902 lifts one end of the crushing tank 3, and the lifting of the hydraulic telescopic column 901 will produce a reaction force. At this time, the hydraulic telescopic column 901 is supported by the slider 2 905 and the slide bar 2 904 and the slide groove 2 903 to produce a sliding effect, thereby facilitating the application of a power lifting effect to the crushing tank 3, so that both ends of the crushing tank 3 can be lifted, which is convenient for adjusting the tilting position and increasing the overall convenience.

[0042] In another embodiment, Figures 1-11 As shown, the two storage barrels 302 are symmetrically and evenly distributed at the bottom of the crushing tank 3. The two storage barrels 302 both penetrate the crushing tank 3 and the thermal insulation layer 308 and extend to the inner wall of the crushing tank 3. The powder filter 305 is located on the inner side of the crushing tank 3. The powder filter 305 is flush with the inner wall of the crushing tank 3. The powder filter 305 is made of austenitic stainless steel.

[0043] The function of the storage barrel 302 is that after the raw materials inside the crushing tank 3 are crushed, some of the powder that has met the size is filtered through the powder filter 305 and directed to the inner side of the storage barrel 302. In order to reduce blockage, the storage barrel 302 is symmetrically designed at the circumferential position of the crushing tank 3, rather than at the bottom. The powder is lifted by the scraping of the paddle 318 and slides through the powder filter 305. The arc shape of the powder filter 305 is flush with the inner wall of the crushing tank 3 to further reduce blockage, so that powder that meets the size can be discharged within one operation cycle. The position limit causes the powder smaller than the aperture of the powder filter 305 to float up and fall multiple times before passing through the diversion, thereby meeting the operation needs and indirectly increasing the efficiency of powder discharge.

[0044] In another embodiment, Figures 1-8 As shown, the air holes 313 are uniformly distributed linearly on the side wall of the hollow tube 309, the crushing knives 315 are uniformly distributed linearly on the outside of the hollow tube 309, the crushing knives 315 are uniformly distributed linearly on the opposite sides of the triangular limiter 310, the triangular limiter 310 is uniformly distributed linearly on the inner wall of the crushing tank 3, the opposite ends of the triangular limiter 310 are movably connected to the outside of the hollow tube 309, the crushing tooth grooves 314 are uniformly distributed linearly on both sides of the triangular limiter 310, the cross section of the triangular limiter 310 is triangular, the two sides of the triangular limiter 310 correspond to the outside of the crushing knives 315, and the triangular limiter 310 and the crushing knives 315 are uniformly distributed linearly and staggered.

[0045] The function of the air vent 313 is to guide the air flow out and in to the inner and outer sides of the hollow tube 309, and to drive the crushing knife 315 to rotate when the hollow tube 309 rotates. After the crushing knife 315 rotates, it crushes the raw material by shearing and squeezing the triangular corner position of the triangular limiter 310, and increases the bite and fixing effect with the raw material through the crushing tooth groove 314 to reduce the sliding caused by the crushing knife 315 and the triangular limiter 310 squeezing the raw material, thereby indirectly improving the crushing effect. The design of the crushing knife 315 and the triangular limiter 310 has the shearing and crushing effect of scissors, which is convenient for crushing. The triangular limiter 310 is fixed to the inner wall of the crushing tank 3, and is crushed, extruded and sheared by the power of the crushing knife 315, which is convenient for crushing.

[0046] In another embodiment, Figures 1-8 As shown, the second guide cone 307 is fixedly mounted on the inner wall of one end of the crushing tank 3, the support bearing 316 passes through the crushing tank 3 and extends to the outside of the crushing tank 3, the second guide cone 307 is movably sleeved on the outside of the hollow tube 309 and the support bearing 316, one end of the hollow tube 309 extends to the outside of the crushing tank 3, the power mechanism 11 includes a reduction servo motor 1101, the reduction servo motor 1101 is fixedly mounted on the outside of the crushing tank 3, the output end of the reduction servo motor 1101 is transmission-connected with a driving gear 1102, the outer side of the driving gear 1102 is meshed with a driven gear ring 1103, the driven gear ring 1103 is fixedly sleeved on the outside of the hollow tube 309, the sealing bearing 1 311 is linearly and evenly distributed on the opposite sides of the hollow tube 309 and the flexible introduction tube 203, one end of the outer sealing sleeve 210 is movably sleeved on the outer end of the hollow tube 309, and the outer side of the sealing cone 1 312 is movably sleeved on the inner wall of the hollow tube 309.

[0047] The second guide cone 307 and the first guide cone 306 support and guide the raw materials to the hollow tube 309, and cover the rotating connection to reduce the overflow of cold air, thereby increasing a certain insulation effect. The support bearing 316 supports the outer side of the hollow tube 309, and cooperates with the second sealing bearing 317 to provide rolling support for the hollow tube 309, thereby ensuring the stable rotation position of the hollow tube 309, and the sealing bearing 1 311 provides rolling support for the hard end of the flexible introduction tube 203, and the sealing bearing 3 1006 provides rolling support for the hard end of the middle flexible connecting tube 1007, thereby providing a rotation support effect for the structure, and when the deceleration servo motor 1101 rotates The driving gear 1102 is driven to rotate, so that the driven gear ring 1103 exerts a rotational force on the hollow tube 309 through the meshing action of the driving gear 1102 and the driven gear ring 1103, thereby driving the hollow tube 309 to rotate. The outer sealing sleeve 210 and the sealing cone 312 perform a rotational seal on the connection between the flexible introduction tube 203 and the hollow tube 309, which is equivalent to a rotary seal, thereby reducing air leakage of the structure. The materials in the scheme are all made of special low-temperature resistant materials to avoid damage to traditional structures and materials due to low temperatures, such as special low-temperature rubber and low-temperature composite flexible pipelines. The hard parts are made of 316L stainless steel and 304 stainless steel.

[0048] In another embodiment, Figures 1-10 As shown, the low-temperature dust filter bag 205 is made of polytetrafluoroethylene filter cloth, the flexible inlet pipe 203 and the middle flexible connecting pipe 1007 are both flexible in the middle and rigid at both ends, the flexible parts of the flexible inlet pipe 203 and the middle flexible connecting pipe 1007 are made of ultra-high molecular weight polyethylene, high-strength fiber braided layer and aging-resistant rubber, the ultra-high molecular weight polyethylene is located in the innermost layer, and the high-strength fiber braided layer is located on the outside of the ultra-high molecular weight polyethylene, and the aging-resistant rubber is located on the outside of the high-strength fiber braided layer. The diameter range of the flexible inlet pipe 203 and the middle flexible connecting pipe 1007 is φ10mm-50mm, the material of the flexible connecting column 207 is silicone rubber, the end of the flexible spring 206 away from the flexible connecting column 207 is fixedly installed on the inner wall of the filter tank 2, the butterfly counterweight plate 208 is butterfly-shaped and the counterweights at both ends are uneven, and the filter tank 2 and the mounting frame 204 are both made of austenitic stainless steel.

[0049] The low-temperature dust filter bag 205 utilizes polytetrafluoroethylene (PTFE) filter cloth. This material offers excellent low-temperature resistance and can be used for extended periods at temperatures between -200°C and 260°C. It is fully compatible with nitrogen low-temperature environments, typically between -50°C and -100°C, and exhibits no brittleness or deformation at low temperatures. It is also chemically stable: resistant to acids, alkalis, and organic solvents, it is suitable for handling Chinese herbal medicine powders containing volatile oils, resins, or acidic components, preventing the material from leaching or adsorbing active ingredients. Its smooth surface offers low fiber tension, resisting powder adhesion and providing excellent cleaning performance. Ultra-high molecular weight polyethylene (UHMWPE) exhibits excellent low-temperature resistance and a smooth surface, with a wear resistance over five times that of ordinary steel pipe, making it suitable for handling medium-hardness powders. A high-strength fiber braid, such as glass fiber or aramid fiber, enhances the pipe's compressive and negative pressure resistance, preventing collapse under negative pressure. An outer layer, made of age-resistant rubber such as neoprene, protects the inner layer and enhances flexibility. The rigid structural ends are constructed of austenitic stainless steel for structural support. The diameter of the flexible pipeline should match the air inlet of the air pump. If the diameter is too small, the flow rate will be too high (>20m / s), which will increase pipe wear; if the diameter is too large, the flow rate will be too low, and the powder will easily settle. The air pump suction flow rate needs to be slightly larger than the nitrogen intake of the crushing chamber, usually 10% to 20% larger, to ensure that a slight negative pressure is maintained in the crushing chamber to prevent nitrogen leakage and powder overflow. The silicone rubber of the flexible connecting column 207 is a low-temperature resistant material that can apply the shaking of the uneven material of the butterfly counterweight plate 208 caused by air flow to the flexible spring 206. The shaking of the flexible spring 206 is applied to the outside of the low-temperature dust filter bag 205 through the flexible connecting column 207, thereby applying a shaking effect to the low-temperature dust filter bag 205, reducing dust accumulation and achieving stable dust discharge.

[0050] In another embodiment, Figures 1-8 As shown, a special low-temperature resistant Roots vacuum pump 1004 is fixedly installed on the outer wall of the filter tank 2, an extraction pipe 1005 is fixedly passed through the filter tank 2 and extends to the bottom of the inner cavity of the filter tank 2, a threaded connector 1008 is fixedly installed on one end of the discharge pipe 1003 away from the return pipe 1001, a sealing bearing three 1006 is sleeved on the outer side of the middle flexible connecting pipe 1007 away from the end of the return pipe 1001, and the sealing bearing three 1006 is sleeved on the inside of the hollow tube 309. A sealing sleeve is provided on one side of the sealing bearing three 1006, and the special low-temperature resistant solenoid valve 1002 is a deep low-temperature solenoid valve.

[0051] The special low-temperature resistant Roots vacuum pump 1004 is started to suck the inside of the filter tank 2 into a negative pressure through the extraction pipe 1005, which is convenient for pumping air flow. The function of the discharge pipe 1003 and the threaded connector 1008 is to connect to the external nitrogen recovery equipment, so as to extract and collect part of the nitrogen for low-temperature circulation and nitrogen circulation. The function of the special low-temperature resistant solenoid valve 1002 is to open and close the low-temperature medium gas of the internal airflow for guiding circulation. The middle flexibility of the middle flexible connecting pipe 1007 adopts the above-mentioned flexible connection structure, and the two ends are made of Austenitic stainless steel to assist the operation of the structure. The deep low-temperature solenoid valve body is made of low-temperature resistant alloys such as 304 and 316 stainless steel to avoid embrittlement at low temperatures; the seals are made of ultra-low temperature resistant materials such as polytetrafluoroethylene PTFE and perfluoroether rubber FFKM. At the same time, internal springs, valve cores and other components need to undergo low-temperature aging treatment to reduce sticking caused by thermal expansion and contraction.

[0052] In another embodiment, Figure 1-Figure 5 As shown, the cryogenic medium adding mechanism 4 includes a Dewar tank 401, the top of the Dewar tank 401 is connected to an input pipe 402, the input pipe 402 is connected to the Dewar tank 401 by a special bayonet joint, the other end of the input pipe 402 is connected to a conveying mechanism 403, the output end of the conveying mechanism 403 is a guide pipe 404, the bottom of the guide pipe 404 is connected to a plurality of connecting pipes 405, the connecting pipes 405 are linearly and evenly distributed at the bottom of the guide pipe 404, the bottom end of the connecting pipe 405 is fixedly passed through the crushing tank 3 and extends to the top of the inner cavity of the crushing tank 3, the bottom end of the connecting pipe 405 is connected to a jet nozzle 406, the conveying mechanism 403 adopts a special low-temperature liquid nitrogen pump, the guide pipe 404, the connecting pipe 405 and the jet nozzle 406 are all made of Austrian stainless steel.

[0053] The Dewar tank 401 is a special storage tank for cryogenic medium gas, which is discharged through the input pipe 402 and input into the interior of the connecting pipe 405 through the conveying mechanism 403 and the guide pipe 404, and finally sprayed into the interior of the crushing tank 3 through the nozzle 406. The conveying mechanism 403 can adopt two operating structures. One is that a special cryogenic liquid nitrogen pump actively pumps out the cryogenic liquid inside the input pipe 402. This method is suitable for low-temperature transportation of large batches of raw materials. The other is that the conveying mechanism 403 adopts a non-powered sealing structure, which only operates the input pipe 402 and the guide pipe 404. The connection of 04 plays the role of diversion and flow metering. In the low-temperature filling stage, the micro-negative pressure inside the filter tank 2 is generated by the special low-temperature resistant Roots vacuum pump 1004 and the inherent pressure in the Dewar tank 401, and the low-temperature medium is transported to the inside of the crushing tank 3 by using the pressure difference. Both modes can be used. According to different needs, two equipment specifications of one large and one small size are produced to meet the crushing needs of large and small raw materials respectively. Two equipment specifications are selected according to needs to avoid the waste of low-temperature medium caused by using large equipment for a small amount of crushing.

[0054] In another embodiment, Figure 1-Figure 5 As shown, the top of the crushing tank 3 is connected to a pressure relief valve 301 , one end of the crushing tank 3 is installed with a control panel 5 , and one side of the first guide cone 306 is installed with a platinum resistance temperature sensor 319 .

[0055] The function of the pressure relief valve 301 is to relieve pressure and assist in sampling. The control panel 5 is an intelligent control device. The core controller of the control panel 5 is an industrial PLC with a PID algorithm, such as the Siemens S7-1200 or a low-temperature dedicated controller, such as the LakeShore 336. It supports multi-channel temperature acquisition and can connect 3-5 sensors. It can also output analog 0-10V or digital signals to control the execution unit. The control output end of the control panel 5 is electrically connected to the input end of the conveying mechanism 403, the hydraulic telescopic column 901, the low-temperature resistant special Roots vacuum pump 1004 and the reduction servo motor 1101. The signal input end of the control panel 5 is connected to the signal output end of the platinum resistance temperature sensor 319. The platinum resistance temperature sensor 319 is generally installed at the bottom end of the first guide cone 306 or the bottom of the inner cavity of the crushing tank 3 to detect the cooling temperature of the raw material.

[0056] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A low-temperature pulverizing device for preparing drug powder, comprising a base, a filter tank, and a low-temperature medium adding mechanism, characterized in that: Four groups of movable support mechanisms are provided on the top of the base, and a support frame is movably installed on the top of the four groups of movable support mechanisms. A support shaft frame is rotatably sleeved on the inner side of the top of the support frame, and a crushing tank is fixedly installed on the opposite side of the support shaft frame. The bottoms of both ends of the crushing tank are provided with hydraulic jacking mechanisms, and a heat insulation layer is fixedly installed inside the side wall of the crushing tank. Two storage barrels are fixedly installed on the outer side of the bottom of the crushing tank, and a powder filter is fixedly installed on the top of the two storage barrels. Both ends of the two storage barrels are connected with a discharge pipe, and a discharge valve is provided inside the discharge pipe. The top of the crushing tank is connected with a feeding barrel, and the top of the feeding barrel is movably sealed with a movable seal. The cover is provided, a first guide cone is fixedly installed on one end of the inner wall of the crushing tank, a sealed bearing 2 is embedded in the interior of one end of the first guide cone, a hollow tube is sleeved on the inner side of the sealed bearing 2, a plurality of air holes are provided on the side wall of the hollow tube, a plurality of groups of crushing knives are fixedly installed on the outer side of the hollow tube, a paddle is fixedly installed on the opposite side of the crushing knives away from one end of the hollow tube, a plurality of triangular limiters are fixedly installed on the inner wall of the crushing tank, a plurality of crushing tooth grooves are provided on both sides of the triangular limiters, a second guide cone is movably sleeved on the outer side of the end of the hollow tube away from the first guide cone, a support bearing is sleeved on the outer side of one end of the hollow tube, and a power mechanism is provided on the outer side of the hollow tube; A top sealing cover is installed on the top of the filter canister through a bolt seal, and the top of the top sealing cover is connected with a flexible inlet pipe, and the outer side of the flexible inlet pipe away from one end of the top sealing cover is sleeved with several sealing bearings, the outer side of the flexible inlet pipe is fixedly sleeved with an outer sealing sleeve, and the outer side of the flexible inlet pipe is fixedly sleeved with a sealing cone, the inner wall of the filter canister is fixedly installed with a mounting bracket, a low-temperature dust filter bag is installed on the top of the mounting bracket, and the bottom end of the low-temperature dust filter bag is connected with a discharge collection pipe, and several flexible connecting columns are fixedly installed on the outer side of the bottom end of the low-temperature dust filter bag, and a flexible spring is fixedly installed on the outer side of the flexible connecting column, and a butterfly counterweight is fixedly installed on the outer side of the flexible spring, and the discharge collection pipe is fixedly passed through the filter canister and extends to the bottom of the filter canister, and the other end of the discharge collection pipe is connected with a sealed collection box, and the outside of the filter canister is connected with an airflow circulation mechanism; The air flow circulation mechanism includes a special low-temperature resistant Roots vacuum pump, the output end of the special low-temperature resistant Roots vacuum pump is connected with a return pipe, the end of the return pipe away from the special low-temperature resistant Roots vacuum pump is connected with a middle flexible connecting pipe, the outer side of the return pipe near the end of the special low-temperature resistant Roots vacuum pump is connected with a discharge pipe, special low-temperature resistant solenoid valves are provided inside the return pipe and the discharge pipe, and the input end of the special low-temperature resistant Roots vacuum pump is connected with an extraction pipe.

2. A low-temperature pulverizing device for preparing medicinal powder according to claim 1, characterized in that: The four groups of movable support mechanisms are symmetrically distributed in a rectangular shape on the top of the base. The number of movable support mechanisms in a group is two. Both movable support mechanisms include a slide groove one, which is opened on the top of the base, a slider one is slidably installed on the inner side of the slide groove one, and a slide rod one is movably sleeved through the inside of the slider one. Both ends of the slide rod one are fixedly installed on the inner wall of the slide groove one, a sliding column is fixedly installed on the top of the slider one, and a return spring is sleeved on the outer side of the sliding column. The sliding column movably passes through the support frame and extends to the top surface of the bottom end of the support frame. The top end of the return spring is fixedly installed on the top end of the sliding column, and the bottom end of the return spring is fixedly installed on the top surface of the bottom end of the support frame.

3. A low-temperature pulverizing device for preparing medicinal powder according to claim 1, characterized in that: The hydraulic jacking mechanism is evenly distributed at both ends of the crushing tank in an axially symmetrical manner. The hydraulic jacking mechanism includes a hydraulic telescopic column and a slide groove 2. The output end of the hydraulic telescopic column is fixedly installed with a collar, and the inner side of the collar is rotatably sleeved with a rotating frame. The top of the rotating frame is fixedly installed on the outer side of the crushing tank. The bottom end of the hydraulic telescopic column is fixedly installed with a slider 2, and the inner side of the slider 2 is penetrated and sleeved with a slide rod 2. The two ends of the slide rod 2 are fixedly installed on the inner wall of the slide groove 2, and the slide groove 2 is opened at the top of the base.

4. A low-temperature pulverizing device for preparing medicinal powder according to claim 1, characterized in that: The two storage barrels are symmetrically and evenly distributed at the bottom of the crushing tank. Both storage barrels pass through the crushing tank and the thermal insulation layer and extend to the inner wall of the crushing tank. The powder filter is located on the inner side of the crushing tank. The powder filter is flush with the inner wall of the crushing tank and is made of austenitic stainless steel.

5. A low-temperature pulverizing device for preparing medicinal powder according to claim 1, characterized in that: The air holes are evenly distributed linearly on the side wall of the hollow tube, the crushing knives are evenly distributed linearly on the outside of the hollow tube, the crushing knives are evenly distributed linearly on the opposite sides of the triangular limiter, the triangular limiter is evenly distributed linearly on the inner wall of the crushing tank, the opposite ends of the triangular limiter are movably sleeved on the outside of the hollow tube, the crushing tooth grooves are evenly distributed linearly on both sides of the triangular limiter, the cross-section of the triangular limiter is triangular, the two sides of the triangular limiter correspond to the outside of the crushing knife, and the triangular limiter and the crushing knife are evenly distributed linearly and staggered.

6. A low-temperature pulverizing device for preparing medicinal powder according to claim 1, characterized in that: The second guide cone is fixedly mounted on the inner wall of one end of the crushing tank, the support bearing passes through the crushing tank and extends to the outside of the crushing tank, the second guide cone is movably sleeved on the outside of the hollow tube and the support bearing, one end of the hollow tube extends to the outside of the crushing tank, the power mechanism includes a reduction servo motor, the reduction servo motor is fixedly mounted on the outside of the crushing tank, the output end of the reduction servo motor is transmission-connected with a driving gear, the outer side of the driving gear is engaged with a driven gear ring, the driven gear ring is fixedly sleeved on the outside of the hollow tube, the sealing bearings are linearly and evenly distributed on the opposite sides of the hollow tube and the flexible introduction tube, one end of the outer sealing sleeve is movably sleeved on the outer end of the hollow tube, and the outer side of the sealing cone is movably sleeved on the inner wall of the hollow tube.

7. A low-temperature pulverizing device for preparing medicinal powder according to claim 1, characterized in that: The low-temperature dust filter bag is made of polytetrafluoroethylene filter cloth. The flexible inlet pipe and the middle flexible connecting pipe are both flexible in the middle and rigid at both ends. The flexible parts of the flexible inlet pipe and the middle flexible connecting pipe are made of ultra-high molecular weight polyethylene, high-strength fiber braided layer and aging-resistant rubber. The ultra-high molecular weight polyethylene is located in the innermost layer, and the high-strength fiber braided layer is located on the outside of the ultra-high molecular weight polyethylene, and the aging-resistant rubber is located on the outside of the high-strength fiber braided layer. The diameter range of the flexible inlet pipe and the middle flexible connecting pipe is φ10mm-50mm. The flexible connecting column is made of silicone rubber. The end of the flexible spring away from the flexible connecting column is fixedly installed on the inner wall of the filter tank. The butterfly counterweight is butterfly-shaped and the weights at both ends are uneven. The filter tank and the mounting frame are both made of austenitic stainless steel.

8. A low-temperature pulverizing device for preparing medicinal powder according to claim 1, characterized in that: A special low-temperature resistant Roots vacuum pump is fixedly installed on the outer wall of the filter tank, the extraction pipe is fixed through the filter tank and extends to the bottom of the inner cavity of the filter tank, a threaded connector is fixedly installed on the end of the discharge pipe away from the return pipe, and a sealing bearing three is sleeved on the outer side of the end of the middle flexible connecting pipe away from the return pipe. The sealing bearing three is sleeved on the inside of the hollow tube, and a sealing sleeve is provided on one side of the sealing bearing three. The special low-temperature resistant solenoid valve is a deep-cryogenic solenoid valve.

9. A low-temperature pulverizing device for preparing medicinal powder according to claim 1, characterized in that: The cryogenic medium adding mechanism includes a Dewar tank. The top of the Dewar tank is connected to an input pipe, which is connected to the Dewar tank by a special bayonet joint. The other end of the input pipe is connected to a conveying mechanism, a flow guide pipe at the output end of the conveying mechanism, and a plurality of connecting pipes are connected to the bottom of the flow guide pipe. The connecting pipes are linearly and evenly distributed at the bottom of the flow guide pipe. The bottom end of the connecting pipe is fixedly passed through the crushing tank and extends to the top of the inner cavity of the crushing tank. The bottom end of the connecting pipe is connected to a jet nozzle. The conveying mechanism adopts a special low-temperature liquid nitrogen pump. The flow guide pipe, connecting pipe and jet nozzle are all made of Austrian stainless steel.

10. A low-temperature pulverizing device for preparing medicinal powder according to claim 1, characterized in that: The top of the crushing tank is connected to a pressure relief valve, one end of the crushing tank is equipped with a control panel, and one side of the first guide cone is equipped with a platinum resistance temperature sensor.

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