A high-efficiency circulating drying device for pharmaceutical raw materials

Abstract

The present invention relates to the field of pharmaceutical production technology, and discloses a high-efficiency circulating drying device for pharmaceutical raw materials, comprising an oven, a movable rack, a tray and a sliding assembly, wherein the movable rack is installed inside the oven, the tray is installed inside the movable rack, and the sliding assembly is arranged inside the oven, and the sliding assembly includes an electric drive gear disk that is driven and installed inside the oven, the surface of the movable rack is distributed in a linear array and is rotatably connected to a screw rod, and the middle part of the outer wall of the screw rod is distributed in an annular array and is fixedly connected to a gear ring; the first slide drives the partition to slide horizontally inside the tray, so that the medicinal materials put into the tray can be spread flat, so that the height of the stacked medicinal materials is reduced during the spreading of the medicinal materials by the partition, thereby avoiding the problem of the medicinal materials scattering when the movable rack moves, and by reducing the thickness of the medicinal materials stacked on the tray, it is avoided that the medicinal materials are stacked inside the tray and difficult to be heated evenly, thereby improving the consistency of the dryness of the medicinal materials after drying.

Description

Technical Field

[0001] The invention relates to the technical field of drug production, in particular to a high-efficiency circulating drying device for drug raw materials. Background Art

[0002] In the pharmaceutical production process, drying of pharmaceutical raw materials is a crucial link, and its drying effect directly affects the quality and performance of the drugs.

[0003] In terms of raw material placement and drying uniformity, traditional drying equipment typically places medicinal materials directly on trays, which are then stacked in the drying equipment. This method results in a thicker stack of medicinal materials on the trays. During the drying process, the upper layers of medicinal materials are easily heated, while the lower layers are not fully reached by the hot air, resulting in uneven heating. This leads to inconsistent drying, affecting the quality of the raw materials, subsequent processing, and the quality of the drugs.

[0004] During the operation of existing drying equipment, the flow of internal hot air will impact the mobile racks where medicinal materials are placed, causing the mobile racks to shake or even shift. This not only affects the drying effect, but may also cause equipment failure due to the instability of the mobile racks, posing a safety hazard.

[0005] Therefore, a high-efficiency circulating drying device for pharmaceutical raw materials is proposed. Summary of the Invention

[0006] The object of the present invention is to provide a high-efficiency circulating drying device for pharmaceutical raw materials to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-efficiency circulating drying device for pharmaceutical raw materials, comprising an oven, a movable rack, a tray and a sliding assembly, wherein the movable rack is installed inside the oven, the tray is installed inside the movable rack, the sliding assembly is arranged inside the oven, and the sliding assembly includes an electrically driven gear disk that is driven and installed inside the oven, the surface of the movable rack is distributed in a linear array and is rotatably connected to a screw rod, the middle part of the outer wall of the screw rod is distributed in an annular array and is fixedly connected to a gear ring, a first transmission belt is connected between the gear rings, and a gear is fixedly connected to the outer wall of the screw rod on the side close to the gear ring. The gear is meshed with the electric drive gear disk, the outer wall of the screw rod is slidably connected to the first slide, and the interior of the movable frame is fixedly connected to the first slide in a linear array. The first slide is slidably connected to the outer wall of the first slide on the side away from the screw rod, and the lower side of the outer wall of the first slide is fixedly connected to a guide plate, the interior of the first slide is slidably connected to the second slide, and the top of the second slide is fixedly connected to the support rod, and the first spring is fixedly connected between the top of the support rod and the second slide, the top of the support rod is fitted with the lower surface of the first slide, and the lower surface of the second slide is fixedly connected to the partition in a linear array.

[0008] Preferably, the guide plate is in an inverted trapezoidal shape on the lower surface of the first slide bar, the height of the guide plate is equal to the depth of the tray, the lower surface of the partition is in contact with the upper surface of the tray, both sides of the partition are chamfered, a roller is provided at the bottom of the movable frame, a slide groove is provided at the bottom of the inner cavity of the oven, and the roller is limited inside the slide groove.

[0009] Preferably, a heat-conducting component is provided inside the first slide, and the heat-conducting component includes tooth plates distributed in a linear array and fixedly connected to the inner wall of the movable frame, the top of the inner cavity of the first slide is distributed in a linear array and rotatably connected to the gear shaft, the outer walls of the gear shaft are connected to the second transmission belt, the outer walls of the gear shaft and the inside of the first slide are fixedly connected to the fan blades, and the second slide and the partition are provided with communicating air guide holes.

[0010] Preferably, when the fan blades rotate, the wind direction is vertically downward, and the outer wall of the second slide plate is tightly fitted with the inner wall of the first slide plate to form an independent space, and the independent space is connected to the outside through the air guide hole.

[0011] Preferably, the outer wall of the oven is symmetrically connected to the hatch, the side wall of the oven is installed with a hot air blower, and a stabilizing component is provided inside the oven, and the stabilizing component includes a second sliding rod slidably connected to the bottom of the oven, and the second sliding rod is located inside the oven and is fixedly connected to a second spring at one end, and an air collecting cabin is provided at the bottom of the oven, and the second spring is fixedly connected to the inner wall of the oven on the side away from the second sliding rod. The inner wall of the oven is symmetrically fixedly connected to a limiting sleeve, and the interior of the limiting sleeve is slidably connected to a magnetic block, the outer wall of the magnetic block is tightly fitted with the inner wall of the limiting sleeve, and the side of the magnetic block close to the inner wall of the oven is fixedly connected to the inner wall of the oven by a third spring, an air guide groove is fixedly connected between the inner cavity of the limiting sleeve and the air collecting cabin, and the outer wall of the movable frame is symmetrically fixedly connected to the magnetic plate.

[0012] Preferably, the magnetic plate and the limiting sleeve are made of neodymium iron boron permanent magnet material and have opposite magnetic poles, the diameter of the second spring is twice that of the third spring, and when the hatch is closed, the end of the second sliding rod close to the hatch is in contact with the inner wall of the hatch, and the second spring is in an elastically contracted state when the hatch is closed. The inner cavity depth of the limiting sleeve is twice the length of the magnetic block.

[0013] Preferably, the inner wall of the first slide plate is provided with a slider which slides inside the screw thread groove.

[0014] Preferably, when the support rod is in contact with the bottom of the guide plate, the partition is in contact with the bottom of the inner cavity of the tray.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The first slide drives the partition to slide horizontally inside the tray, so that the medicinal materials placed inside the tray can be spread evenly. In the process of spreading the medicinal materials on the partition, the height of the stacked medicinal materials is reduced, avoiding the problem of the medicinal materials scattering when the mobile rack moves. By reducing the thickness of the medicinal materials stacked on the tray, it is avoided that the medicinal materials are stacked inside the tray and difficult to heat evenly, thereby improving the consistency of the dryness of the medicinal materials after drying;

[0017] 2. When the first slide moves horizontally inside the mobile rack, hot air is blown to the bottom of the tray through the air guide holes, so that the medicinal materials deposited at the bottom of the tray can also be dried by the hot air, thereby effectively preventing moisture from evaporating and depositing at the bottom of the tray, which makes it difficult to dry the medicinal materials at the bottom of the tray. The air is blown between the medicinal materials through the air guide holes, which can effectively ensure the drying level of the medicinal materials at different depths, so that the heat is evenly distributed inside the equipment, thereby improving the drying efficiency.

[0018] 3. Through the magnetic adsorption of the magnetic block and the magnetic plate, the movable rack as a whole can maintain a stable state during the drying of medicinal materials inside the oven, avoiding the shaking of the movable rack caused by the hot air blowing. When the magnetic block contracts, the limit sleeve resists the outer wall of the movable rack, so that after the cabin door is flipped open, the staff can easily slide the movable rack out of the oven, realizing the function of locking the position of the movable rack after the cabin door is closed and making the position of the movable rack movable after the cabin door is opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the oven of the present invention;

[0021] Figure 3 It is a partial cross-sectional schematic diagram of the oven structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the overall structure of the mobile rack of the present invention;

[0023] Figure 5 It is a partial cross-sectional schematic diagram of the movable frame structure of the present invention;

[0024] Figure 6 It is a partial schematic diagram of the sliding assembly structure of the present invention;

[0025] Figure 7 For the present invention Figure 6 A schematic diagram of the structure at center A;

[0026] Figure 8 It is a schematic cross-sectional view of the overall structure of the present invention.

[0027] In the picture:

[0028] 1. Oven; 2. Door; 3. Hot air blower; 4. Mobile rack; 5. Tray; 6. Sliding assembly; 7. Heat conduction assembly; 8. Stabilizing assembly;

[0029] 61. Electric drive gear disc; 62. Screw; 63. Gear ring; 64. Gear; 65. First transmission belt; 66. First slide; 67. First slide bar; 68. Guide plate; 69. Second slide; 610. Support rod; 611. First spring; 612. Partition plate;

[0030] 71. Tooth plate; 72. Tooth shaft; 73. Second transmission belt; 74. Fan blade; 75. Air guide hole;

[0031] 81. Second slide bar; 82. Second spring; 83. Air collecting chamber; 84. Air guide groove; 85. Limit sleeve; 86. Magnetic block; 87. Third spring; 88. Magnetic plate. DETAILED DESCRIPTION

[0032] 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. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] Embodiments of the present invention

[0034] See also Figures 1 to 8, a high-efficiency circulating drying device for pharmaceutical raw materials, including an oven 1, a mobile rack 4, a tray 5 and a sliding assembly 6, the mobile rack 4 is installed inside the oven 1, the tray 5 is installed inside the mobile rack 4, the sliding assembly 6 is arranged inside the oven 1, the sliding assembly 6 includes an electric drive gear disc 61 that is driven and installed inside the oven 1, the surface of the mobile rack 4 is distributed in a linear array and is rotatably connected to a screw rod 62, the middle part of the outer wall of the screw rod 62 is distributed in an annular array and is fixedly connected to a gear ring 63, the gear rings 63 are connected to a first transmission belt 65, the outer wall of the screw rod 62 is fixedly connected to a gear 64 on the side close to the gear ring 63, the gear 64 is meshed with the electric drive gear disc 61, the screw rod 62 is fixedly connected to the gear ring 63, and the gear 64 is meshed with the electric drive gear disc 61. The outer wall of the rod 62 is slidably connected to the first slide 66, and the inside of the movable frame 4 is fixedly connected to the first slide bar 67 in a linear array. The side of the first slide bar 66 away from the screw rod 62 is slidably connected to the outer wall of the first slide bar 67, and the lower side of the outer wall of the first slide bar 67 is fixedly connected to the guide plate 68. The inside of the first slide bar 66 is slidably connected to the second slide bar 69, and the top of the second slide bar 69 is fixedly connected to the support rod 610. The first spring 611 is fixedly connected between the top of the support rod 610 and the second slide bar 69. The top of the support rod 610 is attached to the lower surface of the first slide bar 67, and the lower surface of the second slide bar 69 is fixedly connected to the partition 612 in a linear array.

[0035] The guide plate 68 is in an inverted trapezoidal shape on the lower surface of the first slide bar 67. The height of the guide plate 68 is equal to the depth of the tray 5. The lower surface of the partition 612 is in contact with the upper surface of the tray 5. Both sides of the partition 612 are chamfered. A roller is provided at the bottom of the movable rack 4, and a slide groove is provided at the bottom of the inner cavity of the oven 1. The roller is limited inside the slide groove.

[0036] The inner wall of the first slide plate 66 is provided with a slider that slides inside the thread groove of the screw rod 62 .

[0037] When the support rod 610 is in contact with the bottom of the guide plate 68 , the partition plate 612 is in contact with the bottom of the inner cavity of the tray 5 .

[0038] When the embodiment of the present invention is actually used, the staff will put the medicinal materials into the inside of the tray 5, and then push the tray 5 into the inside of the mobile rack 4 after the putting is completed. When the trays 5 are stored in the inside of the mobile rack 4 in turn, the staff will push the mobile rack 4 into the inner cavity of the oven 1. When the mobile rack 4 is pushed into the inside of the oven 1, the electric drive gear disc 61 in the inner cavity of the oven 1 will mesh with the gear 64 on the mobile rack 4. Then the staff will close the hatch 2 and start the hot air blower 3. The hot air blower 3 will suck in the outside air and heat it and pump it into the inside of the oven 1. Then the staff will start the equipment to make the electric drive gear disc 61 start to rotate. The rotation of the electric drive gear disc 61 drives the gear 64 meshed with it to rotate together. During the rotation process, the gear 64 will drive multiple screw rods 62 to rotate together on the outer wall of the mobile rack 4 through the transmission of the gear ring 63 and the first transmission belt 65. During the rotation of the screw rod 62, the slider on the inner wall of the gear shaft 72 will slide inside the thread groove of the screw rod 62, The first slide plate 66 slides horizontally inside the movable rack 4. When the first slide plate 66 moves horizontally, it will be limited by the first slide bar 67, so that the first slide plate 66 is in a horizontal sliding state. When the first slide plate 66 slides to the position of the guide plate 68, the guide plate 68 squeezes the support rod 610 downward, so that the second slide plate 69 and the partition 612 slide into the interior of the tray 5 together. The first spring 611 is squeezed and elastically contracts. As the partition 612 extends out of the first slide plate 66, the first slide plate 66 drives the partition 612 to slide horizontally inside the tray 5, so that the medicinal materials placed in the tray 5 can be spread flat, so that the height of the stacked medicinal materials is reduced in the process of spreading the medicinal materials on them by the partition 612, thereby avoiding the problem of the medicinal materials scattering when the movable rack 4 moves. By reducing the thickness of the medicinal materials stacked on the tray 5, it is avoided that the medicinal materials are stacked inside the tray 5 and difficult to be heated evenly, thereby improving the consistency of the dryness of the medicinal materials after drying.

[0039] A heat-conducting component 7 is provided inside the first slide 66. The heat-conducting component 7 includes tooth plates 71 distributed in a linear array and fixedly connected to the inner wall of the movable frame 4. The top of the inner cavity of the first slide 66 is rotatably connected to a gear shaft 72 distributed in a linear array. A second transmission belt 73 is connected between the outer walls of the gear shaft 72. Fan blades 74 are fixedly connected to the outer walls of the gear shaft 72 and located inside the first slide 66. The second slide 69 and the partition 612 are provided with interconnected air guide holes 75.

[0040] When the fan blades 74 rotate, the wind direction is vertically downward, and the outer wall of the second slide plate 69 is tightly fitted with the inner wall of the first slide plate 66 to form an independent space, and the independent space is connected to the outside through the air guide hole 75.

[0041] When the embodiment of the present invention is actually used, during the horizontal movement of the first slide 66 inside the movable frame 4, the gear shaft 72 will move horizontally together with the first slide 66. During the horizontal movement, the gear shaft 72 will mesh with the tooth plate 71 and rotate. During the rotation, the gear shaft 72 drives multiple gear shafts 72 to rotate together through the second transmission belt 73. At this time, because the airflow direction is vertically downward when the fan blades 74 rotate, the gear shaft 72 will pump the air inside the oven 1 into the inner cavity of the first slide 66 through the fan blades 74 when rotating. The air in the inner cavity of the first slide 66 increases and the air pressure increases, so that the air in the inner cavity is discharged to the bottom of the tray 5 through the air guide hole 75.

[0042] When the first slide 66 moves horizontally inside the movable rack 4, hot air is blown toward the bottom of the tray 5 through the air guide holes 75, so that the medicinal materials deposited at the bottom of the tray 5 can also be dried by the hot air, thereby effectively avoiding the problem that moisture evaporation is deposited at the bottom of the tray 5, which makes it difficult to dry the medicinal materials at the bottom of the tray 5. The blowing between the medicinal materials through the air guide holes 75 can effectively ensure the drying level of the medicinal materials at different depths, so that the heat is evenly distributed inside the equipment, thereby improving the drying efficiency.

[0043] The outer wall of the oven 1 is symmetrically connected to the hatch 2 for rotation, and a hot air blower 3 is installed on the side wall of the oven 1. A stabilizing component 8 is provided inside the oven 1, and the stabilizing component 8 includes a second slide bar 81 slidably connected to the bottom of the oven 1. The second slide bar 81 is located inside the oven 1 and one end is fixedly connected to a second spring 82 and an air collecting cabin 83 is provided at the bottom of the oven 1. The second spring 82 is fixedly connected to the inner wall of the oven 1 on the side away from the second slide bar 81. The inner wall of the oven 1 is symmetrically fixedly connected to a limiting sleeve 85, and the interior of the limiting sleeve 85 is slidably connected to a magnetic block 86. The outer wall of the magnetic block 86 is tightly fitted with the inner wall of the limiting sleeve 85, and the side of the magnetic block 86 close to the inner wall of the oven 1 is fixedly connected to the inner wall of the oven 1 by a third spring 87. The inner cavity of the limiting sleeve 85 is fixedly connected to the air collecting cabin 83 with an air guide groove 84, and the outer wall of the movable rack 4 is symmetrically fixedly connected to a magnetic plate 88.

[0044] The magnetic plate 88 and the limiting sleeve 85 are made of neodymium iron boron permanent magnet material and have opposite magnetic poles. The diameter of the second spring 82 is twice that of the third spring 87. When the cabin door 2 is closed, the end of the second slide bar 81 close to the cabin door 2 is in contact with the inner wall of the cabin door 2. The second spring 82 is in an elastically contracted state when the cabin door 2 is closed. The inner cavity depth of the limiting sleeve 85 is twice the length of the magnetic block 86.

[0045] When the embodiment of the present invention is actually used, after the medicinal materials are loaded, the staff pushes the movable rack 4 into the interior of the drying oven 1, and then the staff flips and closes the hatch 2. When the hatch 2 is closed, it will squeeze the second slide bar 81, causing the second slide bar 81 to slide toward the position of the air collecting chamber 83. During the sliding process, the second slide bar 81 will transport the air inside the air collecting chamber 83 to the interior of the limiting sleeve 85 through the air guide groove 84. The air pressure inside the limiting sleeve 85 increases, causing the magnetic block 86 to slide outward inside the limiting sleeve 85. At this time, because the magnetic poles of the magnetic block 86 and the magnetic plate 88 are opposite and magnetically attracted, the magnetic plate 88 will be tightly adsorbed with the magnetic block 86. At this time, because the magnetic block 86 is restricted by the limiting sleeve 85, the movable rack 4 will maintain a stable state after the hatch 2 is closed due to the magnetic adsorption of the magnetic block 86 and the magnetic plate 88, reducing the problem of offset caused by the blowing of drying hot air.

[0046] When the drying of the medicinal materials is completed, the staff flips open the hatch 2. At this time, the second slide bar 81 is no longer squeezed, the second spring 82 elastically stretches and causes the second slide bar 81 to pop out of the oven 1, the inner cavity space of the air collecting chamber 83 increases, and air is drawn into the inner cavity of the limiting sleeve 85 through the air guide groove 84, causing the magnetic block 86 to slide toward the inside of the limiting sleeve 85. When the limiting sleeve 85 slides and drives the movable rack 4 to slide until its side wall collides with the outer wall of the limiting sleeve 85, the movable rack 4 and the magnetic plate 88 cannot continue to move. The continued sliding of the magnetic block 86 will increase the distance between the magnetic block 86 and the magnetic plate 88, causing the magnetic adsorption state to be released. At this time, the staff can pull the movable rack 4 out of the oven 1 without being affected by the magnetic attraction of the magnetic block 86 and the magnetic plate 88.

[0047] Through the magnetic adsorption of the magnetic block 86 and the magnetic plate 88, the movable rack 4 as a whole can maintain a stable state during the process of drying medicinal materials inside the oven 1, avoiding the shaking of the movable rack 4 caused by the hot air blowing. When the magnetic block 86 contracts, the limiting sleeve 85 resists the outer wall of the movable rack 4, so that after the cabin door 2 is flipped open, the staff can easily slide the movable rack 4 out of the oven 1, realizing the function of locking the position of the movable rack 4 after the cabin door 2 is closed and making the position of the movable rack 4 movable after the cabin door 2 is opened.

[0048] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0049] 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 high-efficiency circulating drying device for pharmaceutical raw materials, comprising an oven (1), a movable rack (4), a tray (5) and a sliding assembly (6), characterized in that: The movable frame (4) is installed inside the oven (1), the tray (5) is installed inside the movable frame (4), the sliding assembly (6) is arranged inside the oven (1), the sliding assembly (6) includes an electric drive gear wheel (61) that is driven and installed inside the oven (1), the surface of the movable frame (4) is distributed in a linear array and is rotatably connected to a screw rod (62), the middle part of the outer wall of the screw rod (62) is distributed in an annular array and is fixedly connected to a gear ring (63), the gear rings (63) are connected to each other through a first transmission belt (65), the outer wall of the screw rod (62) is A gear (64) is fixedly connected to the side close to the gear ring (63), and the gear (64) is meshed with the electric drive gear disc (61). The outer wall of the screw rod (62) is slidably connected to the first slide plate (66). The interior of the movable frame (4) is fixedly connected to the first slide rod (67) in a linear array. The side of the first slide rod (66) away from the screw rod (62) is slidably connected to the outer wall of the first slide rod (67). The lower side of the outer wall of the first slide rod (67) is fixedly connected to a guide plate (68). The interior of the first slide rod (66) is slidably connected to the second slide plate (69). The top of each of the second slide plates (69) is fixedly connected to a support rod (610), and a first spring (611) is fixedly connected between the top of each of the support rods (610) and the second slide plate (69). The top of each of the support rods (610) is fitted on the lower surface of the first slide bar (67), and the lower surface of each of the second slide plates (69) is fixedly connected to a partition plate (612) in a linear array. The guide plate (68) is in an inverted trapezoidal shape on the lower surface of the first slide bar (67), and the height of the guide plate (68) is equal to the depth of the tray (5). The lower surface of the partition plate (612) is fitted on the upper surface of the tray (5). Both sides of the partition plate (612) are arranged to be chamfered. A roller is provided at the bottom of the movable frame (4), and a slide groove is provided at the bottom of the inner cavity of the oven (1). The roller is limited to the inside of the slide groove. A heat-conducting assembly (7) is provided inside the first slide plate (66), and the heat-conducting assembly (7) includes tooth plates (71) distributed in a linear array and fixedly connected to the inner wall of the movable frame (4); the top of the inner cavity of the first slide plate (66) is rotatably connected to a gear shaft (72) distributed in a linear array; a second transmission belt (73) is connected between the outer walls of the gear shaft (72); the outer walls of the gear shaft (72) and the interior of the first slide plate (66) are fixedly connected to fan blades (74); the second slide plate (69) and the partition plate (612) are provided with communicating air guide holes (75); When the fan blades (74) rotate, the wind direction is vertically downward, and the outer wall of the second slide plate (69) is tightly fitted with the inner wall of the first slide plate (66) to form an independent space, and the independent space is connected to the outside through the air guide hole (75).

2. The high-efficiency circulating drying device for pharmaceutical raw materials according to claim 1, characterized in that: The outer wall of the oven (1) is symmetrically connected to a hatch (2), a hot air blower (3) is installed on the side wall of the oven (1), a stabilizing assembly (8) is provided inside the oven (1), and the stabilizing assembly (8) includes a second slide bar (81) slidably connected to the bottom of the oven (1), one end of the second slide bar (81) located inside the oven (1) is fixedly connected to a second spring (82), an air collecting cabin (83) is provided at the bottom of the oven (1), and the side of the second spring (82) away from the second slide bar (81) is fixedly connected to the bottom of the oven (1). The inner wall of the oven (1) is symmetrically fixedly connected to a limiting sleeve (85), the interior of the limiting sleeve (85) is slidably connected to a magnetic block (86), the outer wall of the magnetic block (86) is tightly fitted with the inner wall of the limiting sleeve (85), a third spring (87) is fixedly connected between the side of the magnetic block (86) close to the inner wall of the oven (1) and the inner wall of the oven (1), an air guide groove (84) is fixedly connected between the inner cavity of the limiting sleeve (85) and the air collecting chamber (83), and the outer wall of the movable frame (4) is symmetrically fixedly connected to a magnetic plate (88).

3. The high-efficiency circulating drying device for pharmaceutical raw materials according to claim 2, characterized in that: The magnetic plate (88) and the limiting sleeve (85) are made of neodymium iron boron permanent magnet material and have opposite magnetic poles. The diameter of the second spring (82) is twice that of the third spring (87). When the hatch (2) is closed, the end of the second slide bar (81) close to the hatch (2) is in contact with the inner wall of the hatch (2). The second spring (82) is in an elastically contracted state when the hatch (2) is closed. The inner cavity depth of the limiting sleeve (85) is twice the length of the magnetic block (86).

4. The high-efficiency circulating drying device for pharmaceutical raw materials according to claim 1, characterized in that: The inner wall of the first slide plate (66) is provided with a slider which slides inside the thread groove of the screw rod (62).

5. The high-efficiency circulating drying device for pharmaceutical raw materials according to claim 1, characterized in that: When the support rod (610) is in contact with the bottom of the guide plate (68), the partition plate (612) is in contact with the bottom of the inner cavity of the tray (5).

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