A rotary tray type microwave vacuum dryer

Abstract

The present invention belongs to the technical field of microwave vacuum drying machine manufacturing, and provides a rotating tray type microwave vacuum drying machine, including a base, the base is fixedly connected to a shell, a drying box and a refrigeration cycle system are arranged in the shell, the refrigeration cycle system is connected to the drying box, and the drying box is also connected to a microwave generator; the inner end surface of the drying box is rotatably connected to a support frame, the outside of the drying box is fixedly connected to a hydraulic box, the hydraulic box is fixedly connected to a motor, the central axis of the support frame passes through the hydraulic box, and the output shaft of the motor is fixedly connected to the central axis of the support frame. The control system can control the heating temperature in the drying box and the vacuum degree in the drying box by controlling the microwave generator, the refrigeration cycle system, the vibration reduction mechanism and the motor.

Description

Technical Field

[0001] The invention belongs to the technical field of microwave vacuum drying machine manufacturing, and in particular relates to a rotary tray type microwave vacuum drying machine. Background Art

[0002] Vacuum microwave drying is a drying method that combines vacuum technology with microwave heating technology. Its principle is to use the thermal effect of microwaves to heat the material in a vacuum environment, evaporate the water and dry it quickly.

[0003] The change of vacuum degree will have a serious impact on the evaporation temperature, and the temperature change after microwave heating will cause the vacuum degree to rise rapidly. The vacuum degree and temperature are a set of variables that affect each other. In order to ensure the quality of the product, the vacuum degree control is required to have a faster response speed, so that the vacuum degree in the drying process is always constant and not affected by temperature changes. At the same time, the fluctuation rate of the vacuum degree after being constant should be small. In addition to the need to control the vacuum degree and temperature at the same time, in order to ensure the uniformity of microwave heating materials, the rotation speed must also be selected and controlled.

[0004] The existing publication number is CN111637691A, which is a rotary tray type microwave vacuum dryer, belonging to the technical field of agricultural product processing machinery. It includes a drying box, a control system, a vacuum system, a transmission system, a refrigeration cycle system and a microwave heating system. The front of the drying box is provided with a box door with a microwave sealing strip installed and a control system, the top is provided with a microwave heating system, and the bottom is provided with a vacuum system consisting of a vacuum pump and a vacuum solenoid valve connected to the refrigeration cycle system; the refrigeration cycle system is composed of a vacuum pump, a condenser and a water tank, and a transmission system is provided on one side of the box; the transmission system includes a driving motor, a rotary drive device and a main shaft, and the horizontal main shaft supported in the box is connected through the rotary drive device, and the main shaft is fixed with a rotating bracket that rotates with it.

[0005] In the above scheme, although the method of driving the rotating bracket to rotate by the main shaft increases the heating uniformity of the material in the vertical direction, the material is still prone to uneven heating in the horizontal direction; and the main shaft drives the rotating bracket to rotate, and the rotating bracket is prone to rotate under the action of centrifugal force during the rotation process, causing the material on the rotating bracket to scatter everywhere or even spill to the outside of the rotating bracket. Summary of the invention

[0006] The object of the present invention is to provide a rotary tray type microwave vacuum dryer, aiming to solve the technical problems in the prior art of increasing the uniformity of material heating by driving a rotary bracket to rotate through a main shaft, which has limited effect and poor structural stability.

[0007] The present invention is implemented as follows: a rotary tray type microwave vacuum dryer comprises a base, the base is fixedly connected to a shell, a drying box and a refrigeration cycle system are arranged in the shell, the refrigeration cycle system is communicated with the drying box, the drying box is also connected to a microwave generator, and a control panel is fixedly arranged on the outer wall of the shell;

[0008] The inner end surface of the drying box is rotatably connected to a support frame, the outside of the drying box is fixedly connected to a hydraulic box, the hydraulic box is filled with hydraulic oil, the hydraulic box is fixedly connected to a motor, the central axis of the support frame passes through the hydraulic box, and the output shaft of the motor is fixedly connected to the central axis of the support frame, and the hydraulic box is provided with a vibration reduction mechanism for reducing vibration of the support frame;

[0009] The support frame is rotatably connected with a rotating shaft, a transmission assembly is provided in the drying box, and the rotating shaft can rotate under the guidance of the transmission assembly, the rotating shaft is fixedly connected with a mobile frame, and the rotating shaft is fixedly connected to the center position of the mobile frame, the mobile frame is rotatably connected with a rotating rod, and the rotating rod is fixedly connected with a supporting plate, the supporting plates are all connected with a limiting mechanism, and a positioning assembly for vertically limiting the rotating rod is provided between the rotating rod and the mobile frame;

[0010] The control system can control the heating temperature in the drying box and the vacuum degree in the drying box by controlling the microwave generator, the refrigeration cycle system, the vibration reduction mechanism and the motor.

[0011] Further technical solution: the transmission assembly includes a transmission wheel and a guide gear ring, the guide gear ring is fixedly connected to the inner wall of the drying box, the transmission wheel is fixedly connected to one end of the rotating shaft, and the transmission wheel is meshed with the guide gear ring.

[0012] A further technical solution includes a guide assembly, which includes a connecting shaft and a guide wheel. One end of the connecting shaft is rotatably connected to the movable frame, and the other end of the connecting shaft is fixedly connected to the guide wheel, which is meshed with the guide gear ring.

[0013] Further technical solution: the limiting mechanism includes a partition, a baffle, an elastic torsion spring, a connecting rod and an adjustment component;

[0014] A plurality of rows of partitions are fixedly connected to the upper end surface of the support plate, and baffles are arranged on both sides of each row of partitions. The baffles are rotatably connected to the rotating seats on the end surfaces of the support plates through elastic torsion springs, and the baffles are inclined relative to the end surfaces of the support plates. Connecting rods are rotatably connected between the baffles on the same side of each row of partitions, and the rotating rods are fixedly connected to an adjusting assembly, which can drive all the baffles on the same side to rotate synchronously by pushing the connecting rods.

[0015] Further technical solution: the adjustment assembly includes a connecting seat, an adjustment rod and a push plate;

[0016] The connecting seat is fixedly connected to the rotating rod, the connecting seat is rotatably connected to an adjusting rod, the adjusting rod is threadedly connected to a push plate, under the action of an elastic torsion spring, the connecting rod and the push plate are elastically abutted, and the push plate can slide vertically along the rotating rod.

[0017] Further technical solution: the positioning assembly includes a No. 1 magnetic block and a No. 2 magnetic block, the movable frame includes two side panels and multiple fixed rods, all the fixed rods are fixedly connected between the two side panels, and the fixed rods are evenly spaced around the center of the side panels; the fixed rods are fixedly connected to the No. 1 magnetic block, the rotating rods are fixedly connected to the No. 2 magnetic block, and the No. 1 magnetic block and the No. 2 magnetic block repel each other.

[0018] Further technical solution: the vibration reduction mechanism includes a piston plate, a conduit and a one-way solenoid valve;

[0019] The inner wall of the hydraulic box is slidably and sealingly connected to a piston plate, the inner cavity of the hydraulic box is connected to two conduits, both ends of the conduits are respectively connected to the side walls of the hydraulic box on the upper and lower sides of the piston plate, and both conduits are provided with one-way solenoid valves, both of which can conduct in one direction, and the conduction directions of the two one-way solenoid valves on their respective conduits are opposite.

[0020] Further technical solution: the refrigeration cycle system includes a vacuum pump, a condenser and a water tank;

[0021] The vacuum pump is connected to the drying box, and is also connected to the condenser and the water tank in sequence; the vacuum pump, the condenser and the water tank form a refrigeration cycle system to control the vacuum degree in the drying box.

[0022] Further technical solution: The control system comprises:

[0023] A monitoring module, which includes a temperature sensor and a vibration sensor. The support plate is provided with a temperature sensor, and the support frame is provided with a vibration sensor;

[0024] A storage module, which is used to store the maximum temperature difference between each temperature sensor and the vibration frequency value of the vibration sensor in the monitoring module at the same time;

[0025] A processing module, which is used to retrieve the maximum temperature difference between each temperature sensor and the vibration frequency value of the vibration sensor at the current moment, and compare the two with the temperature difference threshold and the vibration frequency threshold preset in the processing module respectively, and if at least one of them exceeds the corresponding threshold, a judgment information is formed;

[0026] A control module, which is used to receive the judgment information and control the microwave generator, the refrigeration cycle system, the vibration reduction mechanism and the motor;

[0027] The storage module, processing module and control module are integrated in the control panel.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. Driven by the support frame, all the support plates on the mobile frame reciprocate in the horizontal direction. Under the transmission action of the transmission assembly, all the support plates on the mobile frame reciprocate in the vertical direction, thereby effectively improving the heating uniformity of the materials in all the limit mechanisms on the support plates;

[0030] 2. The limiting mechanism limits the material inside to prevent the material from piling up to one side under the action of centrifugal force. At the same time, the positioning component limits the rotating rod vertically to prevent the support plate from shaking too much and affecting the drying uniformity of the material. Furthermore, the support frame is vibration-reduced by the vibration reduction mechanism to prevent the support frame from vibrating too much and reducing the sealing of the drying box, thereby affecting the vacuum degree in the drying box.

[0031] 3. The transmission wheel and the guide wheel are meshed with the guide gear ring, thereby increasing the horizontal movement stability of the support frame and other mechanisms on the support frame during the rotation of the support frame.

[0032] 4. During the rotation of the mobile frame, the No. 1 magnetic block always applies a vertical downward magnetic thrust to the No. 2 magnetic block, thereby increasing the vertical stability of the rotating rod and preventing the support plate from shaking randomly under the action of inertia during the rotation of the mobile frame.

[0033] 5. The control system can control the heating temperature in the drying box and the vacuum degree in the drying box by controlling the microwave generator, refrigeration cycle system, vibration reduction mechanism and motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0035] Figure 2 It is a schematic diagram of the internal structure of the drying box in the present invention.

[0036] Figure 3 for Figure 2 Schematic diagram of the front view structure.

[0037] Figure 4 It is a schematic diagram of the structure of the transmission assembly and the guide assembly in the present invention.

[0038] Figure 5 It is a schematic diagram of the connection between the movable frame and the limiting mechanism in the present invention.

[0039] Figure 6 for Figure 5 Side view of.

[0040] Figure 7 It is a schematic diagram of the structure of the positioning component in the present invention.

[0041] Figure 8 It is a structural schematic diagram of the limiting mechanism in the present invention.

[0042] Fig. 9 for Figure 8 A magnified schematic diagram of area A in the middle.

[0043] In the accompanying drawings: 1. base; 2. shell; 3. drying box; 4. refrigeration cycle system; 41. vacuum pump; 42. condenser; 43. water tank; 5. vibration reduction mechanism; 51. piston plate; 52. guide tube; 53. one-way solenoid valve; 6. transmission assembly; 61. transmission wheel; 62. guide gear ring; 7. guide assembly; 71. connecting shaft; 72. guide wheel; 8. limiting mechanism; 81. partition; 82. baffle; 83. elastic torsion spring; 84. connecting rod; 85. adjustment assembly; 851. connecting seat; 852. adjustment rod; 853. push plate; 9. positioning assembly; 91. No. 1 magnetic block; 92. No. 2 magnetic block; 10. hydraulic box; 11. motor; 12. support frame; 13. rotating shaft; 14. moving frame; 141. side panel; 142. fixing rod; 15. rotating rod; 16. support plate; 17. control panel. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0045] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0046] like Figure 1-Figure 9 As shown, a rotary tray type microwave vacuum dryer provided by the present invention comprises a base 1, the base 1 is fixedly connected to a shell 2, a drying box 3 and a refrigeration cycle system 4 are arranged in the shell 2, the refrigeration cycle system 4 is communicated with the drying box 3, the drying box 3 is also connected to a microwave generator, and a control panel 17 is fixedly arranged on the outer wall of the shell 2;

[0047] The inner end surface of the drying box 3 is rotatably connected to a support frame 12, and the outside of the drying box 3 is fixedly connected to a hydraulic box 10, which is filled with hydraulic oil. The hydraulic box 10 is fixedly connected to a motor 11, and the central axis of the support frame 12 passes through the hydraulic box 10, and the output shaft of the motor 11 is fixedly connected to the central axis of the support frame 12. The hydraulic box 10 is provided with a vibration reduction mechanism 5 for reducing vibration of the support frame 12;

[0048] The support frame 12 is rotatably connected with a rotating shaft 13, and a transmission assembly 6 is provided in the drying box 3. Under the guidance of the transmission assembly 6, the rotating shaft 13 can rotate, and the rotating shaft 13 is fixedly connected with a moving frame 14, and the rotating shaft 13 is fixedly connected to the center position of the moving frame 14, and the moving frame 14 is rotatably connected with a rotating rod 15, and the rotating rod 15 is fixedly connected with a supporting plate 16, and the supporting plates 16 are all connected to the limiting mechanism 8, and a positioning assembly 9 for vertically limiting the rotating rod 15 is provided between the rotating rod 15 and the moving frame 14;

[0049] The control system can control the heating temperature in the drying box 3 and the vacuum degree in the drying box 3 by controlling the microwave generator, the refrigeration cycle system 4 , the vibration reduction mechanism 5 and the motor 11 .

[0050] In this embodiment, when in use, the material to be dried is evenly spread in each of the limiting mechanisms 8 inside the drying box 3, then the drying box 3 and the housing 2 are closed, the refrigeration cycle system 4 is turned on, so that the inside of the drying box 3 is in a vacuum state, and then the microwave generator is turned on to control the heating temperature at a preset heating temperature, so as to heat the material in the drying box 3. During this process, the heating temperature in the drying box 3 and the vacuum degree in the drying box 3 are constantly monitored and regulated;

[0051] The motor 11 is started to reciprocate, and the motor 11 drives the support frame 12 to reciprocate. Under the transmission action of the transmission assembly 6, the rotating shaft 13 drives the mobile frame 14 to reciprocate. In this process, under the drive of the support frame 12, all the support plates 16 on the mobile frame 14 reciprocate in the horizontal direction, and under the transmission action of the transmission assembly 6, all the support plates 16 on the mobile frame 14 reciprocate in the vertical direction, thereby effectively improving the heating uniformity of the materials in all the limiting mechanisms 8 on the support plates 16;

[0052] During this process, the limiting mechanism 8 limits the material inside it to prevent the material from piling up to one side under the action of centrifugal force. At the same time, the positioning component 9 vertically limits the rotating rod 15 to prevent the support plate 16 from shaking too much and affecting the drying uniformity of the material. Furthermore, the support frame 12 is vibration-reduced by the vibration reduction mechanism 5 to prevent the support frame 12 from vibrating too much and reducing the sealing of the drying box 3, thereby affecting the vacuum degree in the drying box 3.

[0053] like Figure 4 As shown, a rotary tray type microwave vacuum dryer provided by the present invention, the transmission assembly 6 includes a transmission wheel 61 and a guide gear ring 62, the guide gear ring 62 is fixedly connected to the inner wall of the drying box 3, the transmission wheel 61 is fixedly connected to one end of the rotating shaft 13, and the transmission wheel 61 is meshed with the guide gear ring 62.

[0054] In this embodiment, when the support frame 12 reciprocates, the support frame 12 drives the rotating shaft 13 to move synchronously. Under the meshing action of the transmission wheel 61 and the guide gear ring 62, the rotating shaft 13 itself reciprocates, thereby driving the connected moving frame 14 to reciprocate.

[0055] like Figure 4 As shown, a rotary tray type microwave vacuum dryer provided by the present invention also includes a guide assembly 7, wherein the guide assembly 7 includes a connecting shaft 71 and a guide wheel 72, wherein one end of the connecting shaft 71 is rotatably connected to the movable frame 14, and the other end of the connecting shaft 71 is fixedly connected to the guide wheel 72, and the guide wheel 72 is meshed with the guide gear ring 62.

[0056] In this embodiment, when the support frame 12 drives the movable frame 14 to rotate horizontally back and forth, the guide wheel 72 drives the connecting shaft 71 to rotate under the drive of the movable frame 14 and the guiding action of the guide gear ring 62; in this process, the transmission wheel 61 and the guide wheel 72 are engaged with the guide gear ring 62, thereby increasing the horizontal movement stability of the support frame 12 and the remaining mechanisms on the support frame 12 during the rotation of the support frame 12.

[0057] like Figure 7 and Figure 8 As shown, a rotary tray type microwave vacuum dryer provided by the present invention, the limiting mechanism 8 includes a partition 81, a baffle 82, an elastic torsion spring 83, a connecting rod 84 and an adjusting assembly 85;

[0058] The upper end surface of the support plate 16 is fixedly connected to multiple rows of partitions 81, and baffles 82 are arranged on both sides of each row of partitions 81. The baffles 82 are rotatably connected to the rotating seats on the end surfaces of the support plate 16 through elastic torsion springs 83, and the baffles 82 are inclined relative to the end surface of the support plate 16. A connecting rod 84 is rotatably connected between the baffles 82 on the same side of each row of partitions 81, and the rotating rod 15 is fixedly connected to an adjusting assembly 85, and the adjusting assembly 85 can drive all the baffles 82 on the same side to rotate synchronously by pushing the connecting rod 84.

[0059] In this embodiment, the baffle 82 limits the material to prevent the material from falling outward during the movement of the support plate 16, and during the rotation of the support frame 12, the material is limited by each partition plate 81 to prevent the material from piling up at one end of the support plate 16.

[0060] like Figure 8 As shown, a rotary tray type microwave vacuum dryer provided by the present invention, the adjustment component 85 includes a connecting seat 851, an adjustment rod 852 and a push plate 853;

[0061] The connecting seat 851 is fixedly connected to the rotating rod 15, and the connecting seat 851 is rotatably connected to the adjusting rod 852, and the adjusting rod 852 is threadedly connected to the push plate 853. Under the action of the elastic torsion spring 83, the connecting rod 84 elastically abuts against the push plate 853, and the push plate 853 can slide vertically along the rotating rod 15.

[0062] In this embodiment, the adjusting rod 852 is rotated, and the adjusting rod 852 pushes the push plate 853 to move vertically through threaded transmission. The push plate 853 pushes the connecting rod 84, and the connecting rod 84 drives the baffle 82 connected thereto to rotate, thereby adjusting the angle between the baffle 82 and the support plate 16.

[0063] like Figure 7 As shown, a rotary tray type microwave vacuum dryer provided by the present invention, the positioning assembly 9 includes a No. 1 magnetic block 91 and a No. 2 magnetic block 92, the movable frame 14 includes two side panels 141 and a plurality of fixed rods 142, all the fixed rods 142 are fixedly connected between the two side panels 141, and the fixed rods 142 are evenly spaced around the center of the side panels 141; the fixed rods 142 are fixedly connected to the No. 1 magnetic block 91, the rotating rods 15 are fixedly connected to the No. 2 magnetic block 92, and the No. 1 magnetic block 91 and the No. 2 magnetic block 92 repel each other.

[0064] In this embodiment, during the rotation of the mobile frame 14, the first magnetic block 91 always applies a vertical downward magnetic thrust to the second magnetic block 92, thereby increasing the vertical stability of the rotating rod 15 and preventing the support plate 16 from shaking randomly under the action of inertia during the rotation of the mobile frame 14.

[0065] like Figure 3 As shown, a rotary tray type microwave vacuum dryer provided by the present invention, the vibration reduction mechanism 5 includes a piston plate 51, a conduit 52 and a one-way electromagnetic valve 53;

[0066] The inner wall of the hydraulic box 10 is slidably and sealingly connected with a piston plate 51, and the inner cavity of the hydraulic box 10 is connected with two conduits 52. Both ends of the conduits 52 are respectively connected with the side walls of the hydraulic box 10 on the upper and lower sides of the piston plate 51. One-way solenoid valves 53 are arranged on the two conduits 52. Both one-way solenoid valves 53 can conduct in one direction, and the conduction directions of the two one-way solenoid valves 53 on their respective conduits 52 are opposite.

[0067] In this embodiment, when the two one-way solenoid valves 53 are turned on, the cavities on the upper and lower sides of the piston plate 51 in the hydraulic box 10 form a circulation passage through the two conduits 52;

[0068] When the motor 11 drives the support frame 12 to rotate back and forth, the central axis of the support frame 12 drives the piston plate 51 to move vertically back and forth along the inner wall of the hydraulic box 10 through threaded transmission. The piston plate 51 pushes the hydraulic oil in the hydraulic box 10 to flow back and forth along the two conduits 52, and the vibration of the support frame 12 is reduced by the fluidity and compressibility of the hydraulic oil.

[0069] like Figure 1 As shown, a rotary tray type microwave vacuum dryer provided by the present invention, the refrigeration cycle system 4 includes a vacuum pump 41, a condenser 42 and a water tank 43;

[0070] The vacuum pump 41 is connected to the drying box 3 , and is also connected to the condenser 42 and the water tank 43 in sequence; the refrigeration cycle system 4 formed by the vacuum pump 41 , the condenser 42 and the water tank 43 is used to control the vacuum degree in the drying box 3 .

[0071] The present invention provides a rotary tray type microwave vacuum dryer, wherein the control system comprises:

[0072] A monitoring module, which includes a temperature sensor and a vibration sensor. The support plate 16 is provided with a temperature sensor, and the support frame 12 is provided with a vibration sensor;

[0073] A storage module, which is used to store the maximum temperature difference between each temperature sensor and the vibration frequency value of the vibration sensor in the monitoring module at the same time;

[0074] A processing module, which is used to retrieve the maximum temperature difference between each temperature sensor and the vibration frequency value of the vibration sensor at the current moment, and compare the two with the temperature difference threshold and the vibration frequency threshold preset in the processing module respectively, and if at least one of them exceeds the corresponding threshold, a judgment information is formed; the processing module is preferably a computer processor;

[0075] The control module is used to receive the judgment information and control the microwave generator, the refrigeration cycle system 4, the vibration reduction mechanism 5 and the motor 11; the control module is preferably a PLC controller, and the storage module, the processing module and the control module are integrated in the control panel 17.

[0076] In this embodiment, the maximum temperature difference between the temperature sensors at the current moment exceeds the temperature difference threshold preset in the processing module. At this time, the control module receives the judgment information and controls the motor 11 to increase the speed, thereby improving the heating uniformity of all materials;

[0077] At the current moment, the vibration frequency value of the vibration sensor exceeds the preset vibration frequency threshold value in the processing module. At this time, the control module controls the two one-way solenoid valves 53 to reduce the intercepting area, thereby increasing the vibration reduction effect on the support frame 12, avoiding excessive vibration of the support frame 12 and reducing the sealing of the drying box 3, thereby affecting the vacuum degree in the drying box 3;

[0078] When the temperature value of a certain temperature sensor exceeds the temperature threshold preset in the processing module, the control module controls to reduce the working power of the microwave generator, thereby reducing the heating temperature of the material.

[0079] The monitoring module also includes a vacuum tester, which is connected to the drying box 3. When the displayed value in the vacuum tester exceeds the vacuum threshold preset in the processing module, the control module controls the refrigeration cycle system 4 to control the vacuum in the drying box 3.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0081] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A rotary tray type microwave vacuum dryer, comprising a base (1), the base (1) being fixedly connected to a housing (2), a drying box (3) and a refrigeration cycle system (4) being arranged in the housing (2), the refrigeration cycle system (4) being in communication with the drying box (3), the drying box (3) being further connected to a microwave generator, a control panel (17) being fixedly arranged on the outer wall of the housing (2), characterized in that: The inner end surface of the drying box (3) is rotatably connected to a support frame (12); the outside of the drying box (3) is fixedly connected to a hydraulic box (10); the hydraulic box (10) is filled with hydraulic oil; the hydraulic box (10) is fixedly connected to a motor (11); the central axis of the support frame (12) passes through the hydraulic box (10); the output shaft of the motor (11) is fixedly connected to the central axis of the support frame (12); and a vibration reduction mechanism (5) for reducing vibration of the support frame (12) is provided in the hydraulic box (10); The support frame (12) is rotatably connected to a rotating shaft (13); a transmission assembly (6) for driving the rotating shaft (13) to rotate is provided in the drying box (3); the rotating shaft (13) is fixedly connected to a moving frame (14), and the rotating shaft (13) is fixedly connected to a center position of the moving frame (14); the moving frame (14) is rotatably connected to a rotating rod (15); the rotating rod (15) is fixedly connected to a supporting plate (16); the supporting plates (16) are both connected to a limiting mechanism (8); and a positioning assembly (9) for vertically limiting the rotating rod (15) is provided between the rotating rod (15) and the moving frame (14); A control system capable of controlling the heating temperature in the drying box (3) and the vacuum degree in the drying box (3) by controlling the microwave generator, the refrigeration cycle system (4), the vibration reduction mechanism (5) and the motor (11); The transmission assembly (6) comprises a transmission wheel (61) and a guide gear ring (62), wherein the guide gear ring (62) is fixedly connected to the inner wall of the drying box (3), the transmission wheel (61) is fixedly connected to one end of the rotating shaft (13), and the transmission wheel (61) is meshed with the guide gear ring (62); It also includes a guide assembly (7), the guide assembly (7) including a connecting shaft (71) and a guide wheel (72), one end of the connecting shaft (71) is rotatably connected to the moving frame (14), the other end of the connecting shaft (71) is fixedly connected to the guide wheel (72), and the guide wheel (72) is meshed with the guide gear ring (62); The limiting mechanism (8) comprises a partition (81), a baffle (82), an elastic torsion spring (83), a connecting rod (84) and an adjusting assembly (85); a plurality of rows of partitions (81) are fixedly connected to the upper end surface of the support plate (16); baffles (82) are arranged on both sides of each row of partitions (81); the baffles (82) are rotatably connected to a rotating seat on the end surface of the support plate (16) via the elastic torsion spring (83); the baffles (82) are arranged to be inclined relative to the end surface of the support plate (16); connecting rods (84) are rotatably connected between the baffles (82) on the same side of each row of partitions (81); the rotating rod (15) is fixedly connected to the adjusting assembly (85); the adjusting assembly (85) can drive all the baffles (82) on the same side to rotate synchronously by pushing the connecting rod (84); The adjustment assembly (85) comprises a connecting seat (851), an adjustment rod (852) and a push plate (853); the connecting seat (851) is fixedly connected to the rotating rod (15); the connecting seat (851) is rotatably connected to the adjustment rod (852); the adjustment rod (852) is threadedly connected to the push plate (853); under the action of the elastic torsion spring (83), the connecting rod (84) and the push plate (853) are elastically abutted against each other, and the push plate (853) can slide vertically along the rotating rod (15).

2. The rotary tray type microwave vacuum dryer according to claim 1, characterized in that: The positioning assembly (9) comprises a first magnetic block (91) and a second magnetic block (92); the moving frame (14) comprises two side plates (141) and a plurality of fixed rods (142); all the fixed rods (142) are fixedly connected between the two side plates (141); the fixed rods (142) are evenly spaced around the center of the side plates (141); the fixed rods (142) are fixedly connected to the first magnetic block (91); the rotating rods (15) are fixedly connected to the second magnetic block (92); and the first magnetic block (91) and the second magnetic block (92) repel each other.

3. The rotary tray type microwave vacuum dryer according to claim 1, characterized in that: The vibration reduction mechanism (5) comprises a piston plate (51), a guide tube (52) and a one-way solenoid valve (53); The inner wall of the hydraulic box (10) is slidably and sealingly connected to a piston plate (51), the inner cavity of the hydraulic box (10) is connected to two conduits (52), both ends of the conduits (52) are respectively connected to the side walls of the hydraulic box (10) on the upper and lower sides of the piston plate (51), and one-way solenoid valves (53) are provided on the two conduits (52). Both one-way solenoid valves (53) can conduct in one direction, and the conduction directions of the two one-way solenoid valves (53) on their respective conduits (52) are opposite.

4. The rotary tray type microwave vacuum dryer according to claim 1, characterized in that: The control system comprises: A monitoring module, comprising a temperature sensor and a vibration sensor, wherein the support plate (16) is provided with a temperature sensor, and the support frame (12) is provided with a vibration sensor; A storage module, which is used to store the maximum temperature difference between each temperature sensor and the vibration frequency value of the vibration sensor in the monitoring module at the same time; A processing module, which is used to retrieve the maximum temperature difference between each temperature sensor and the vibration frequency value of the vibration sensor at the current moment, and compare the two with the temperature difference threshold and the vibration frequency threshold preset in the processing module respectively, and if at least one of them exceeds the corresponding threshold, a judgment information is formed; A control module, which is used to receive the judgment information and control the microwave generator, the refrigeration cycle system (4), the vibration reduction mechanism (5) and the motor (11); The storage module, processing module and control module are integrated in the control panel (17).

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