Microwave vacuum low-temperature solid belt dryer

Abstract

The utility model discloses a microwave vacuum low-temperature solid belt dryer which comprises a cavity, and automatic sealing doors are arranged at the two ends of the cavity. The device further comprises a storage bin, a first conveyor, a first storage tank, a first spiral conveyor, a plurality of chain scraper conveyors, a second spiral conveyor and a second storage tank. Wherein the input end of the first conveyor is connected with the storage bin; the first storage tank is communicated with the cavity; the first storage tank is connected with the output end of the first conveyor; the first spiral conveyor is connected with the first storage tank; the plurality of chain scraper conveyors are sequentially arranged in the cavity; the second screw conveyor is connected with the chain scraper conveyor on the lowermost layer; and the second storage tank is communicated with the second screw conveyer. The drying condition of internal products is convenient to observe; granular solid products such as gravels can be uniformly distributed on the chain scraper conveyor, so that the heating is more uniform; the chain scraper conveyors are connected end to end, so that the product stays in the cavity for a longer time, and the heating effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave drying equipment, in particular to a microwave vacuum low-temperature solid belt drying machine. Background Art

[0002] Vacuum continuous liquid belt dryers are a widely used type of drying equipment, widely used in the food, pharmaceutical, and chemical industries. Existing vacuum continuous belt dryers use steam, superheated water, thermal oil, and other media as heat sources, requiring supporting infrastructure such as steam. Heat transfer primarily relies on conduction, with heat transferred from the heating plate to the belt, and then from the belt to the material. This results in a low heat transfer coefficient, significantly impacting drying efficiency.

[0003] Patent document CN118031574A discloses a tunnel-type microwave vacuum ultra-low temperature drying device and material drying process for drying materials. The tunnel-type microwave vacuum ultra-low temperature drying device comprises: a main unit comprising a cavity having a cylindrical structure and a plurality of microwave generators; the cavity having a regular polygonal cross-section; the plurality of microwave generators being disposed on the outer wall of the cavity and arranged sequentially along at least the length of the cavity; a vacuum unit, the vacuum port of the vacuum unit being connected to the cavity via a pipeline; and a chiller, the cooling water pipe of the chiller being connected to the microwave generators and used to cool the microwave generators. By utilizing the property of microwaves that polar molecules oscillate and generate heat, and aided by the vacuum unit to evacuate the cavity, the water-containing material in the cavity is rapidly evaporated at low temperature within the vacuum environment, achieving drying efficiency and preventing damage to the material due to excessive temperature. However, this invention has the following shortcomings: 1) This invention belongs to intermittent microwave low-temperature evaporation, that is, after evaporating a batch of products, the cavity needs to be opened and new products to be evaporated need to be fed in. Its continuity is not very high, and it is mainly aimed at the evaporation of packaging paper bag products; 2) It is not suitable for the evaporation of granular products such as sand and gravel, especially continuous evaporation. Summary of the Invention

[0004] According to an embodiment of the present invention, a microwave vacuum low-temperature solid belt dryer is provided, comprising a cavity with automatic sealing doors provided at both ends of the cavity; and further comprising:

[0005] Storage silo, which is used to store the products to be dried;

[0006] A first conveyor, the input end of which is connected to the storage bin and is used to output the product to be dried from the storage bin;

[0007] The first storage tank is arranged on the cavity and communicates with the cavity; the upper end of the first storage tank is provided with an inlet, and the inlet is connected with the output end of the first conveyor; an electromagnetic valve is arranged between the inlet and the first storage tank, and an electromagnetic valve is arranged between the first storage tank and the cavity;

[0008] The first spiral conveyor is connected with the first storage tank, and a row of first discharge holes is arranged below the hopper of the first spiral conveyor;

[0009] A plurality of chain conveyors are arranged in the cavity in sequence and staggered from top to bottom;

[0010] The second spiral conveyor is connected with the lowermost chain conveyor and is used for outputting the dried products;

[0011] The second storage tank is arranged outside the cavity and communicates with the second spiral conveyor.

[0012] Further, the upper end of the first conveyor is provided with a dust cover.

[0013] Further, half of the spiral blades of the first spiral conveyor rotates to the left, and the other half rotates to the right.

[0014] Further, a plurality of fixed supports are arranged at two ends of the chain conveyor and are fixedly connected with the chain conveyor.

[0015] Further, a layer of belt is arranged on the chain plate of the chain conveyor.

[0016] Further, a shunt assembly is arranged on the chain plate of the chain conveyor.

[0017] Further, the shunt assembly comprises a connecting rod and a plurality of shunt rods; the connecting rod is fixedly connected with the fixed supports at two ends, and the plurality of shunt rods are fixedly connected with the connecting rod.

[0018] Further, an electromagnetic valve is arranged on the inlet and the outlet of the second storage tank.

[0019] Further, a plurality of cameras are arranged on the automatic sealing door, and the cameras correspond to the chain conveyors.

[0020] The microwave vacuum low-temperature solid belt dryer according to the embodiment of the present application can observe the drying condition of the products inside; can uniformly distribute the granular solid products such as sand and gravel on the chain conveyor, so that the heating is more uniform; the plurality of chain conveyors are connected with each other, so that the products stay in the cavity for a longer time, and the heating effect is better.

[0021] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of a part of the structure according to an embodiment of the present utility model;

[0023] Figure 2 for Figure 1 A top view of

[0024] Figure 3 for Figure 2 BB cross-sectional view;

[0025] Figure 4 for Figure 3 A magnified view of point A;

[0026] Figure 5 It is a structural schematic diagram of the connection between the material storage box, the first conveyor, the first material storage tank, the first screw conveyor, the chain conveyor and the second screw conveyor according to an embodiment of the present utility model;

[0027] Figure 6 for Figure 5 Enlarged view of point B;

[0028] Figure 7 It is a schematic structural diagram of the silo of the first screw conveyor according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to further illustrate the present invention.

[0030] First, combine Figures 1 to 7 The microwave vacuum low-temperature solid belt dryer according to the embodiment of the present invention is described, which is used for continuous drying of granular products and has a wide range of application scenarios.

[0031] like Figures 1 to 7 As shown, the microwave vacuum low-temperature solid belt dryer of the embodiment of the utility model comprises a cavity 1, with automatic sealing doors 11 provided at both ends of the cavity 1; and further comprises:

[0032] Storage silo 2, storage silo 2 is used to store the product to be dried;

[0033] A first conveyor 3 (existing technology), the input end of which is connected to the storage bin 2 and is used to output the product to be dried from the storage bin 2;

[0034] The first material storage tank 4 is arranged on the cavity 1 and is connected with the cavity 1; a feed port is provided at the upper end of the first material storage tank 4, and the feed port is connected with the output end of the first conveyor 3; a solenoid valve is provided between the feed port and the first material storage tank 4, and a solenoid valve is provided between the first material storage tank 4 and the cavity 1; first, the solenoid valve between the feed port and the first material storage tank 4 is opened, and the solenoid valve between the first material storage tank 4 and the cavity 1 is closed, and then the first conveyor 3 delivers the product from the storage bin 2 to the feed port of the first material storage tank 4; after the first material storage tank 4 is full, the solenoid valve between the feed port and the first material storage tank 4 is closed, and the solenoid valve between the first material storage tank 4 and the cavity 1 is opened, and the product falls from the first material storage tank 4 to the material bin of the first screw conveyor; two solenoid valves are provided to ensure the vacuum degree in the cavity 1 during the continuous drying process.

[0035] The first screw conveyor 5 is connected to the first storage tank 4. A row of first discharge holes 511 is provided below the silo 51 of the first screw conveyor 5;

[0036] A plurality of chain conveyors 6 are sequentially arranged in the cavity 1 and staggered from top to bottom;

[0037] The second screw conveyor 7 is connected to the chain conveyor 6 at the bottom layer and is used to output the dried product;

[0038] The second material storage tank (not shown, belonging to the prior art) is arranged outside the cavity 1 and is connected to the second screw conveyor 7.

[0039] Further, if Figure 1 As shown, in this embodiment, a dust cover 31 is provided at the upper end of the first conveyor 3 to reduce the amount of smoke and dust generated when the products are output from the first conveyor 3 and floating into the air.

[0040] Further, if Figure 7 As shown, in this embodiment, half of the spiral blades 52 of the first screw conveyor 5 rotate to the left, and the other half rotate to the right. When the product falls from the first storage tank 4 into the silo 51 of the first screw conveyor 5, the product passes through the spiral blades 52 and is evenly distributed in the silo 51, and falls from the first discharge hole 511 onto the chain conveyor 6.

[0041] Further, if Figure 3 、 5 As shown in , 7 , in this embodiment, a plurality of fixed brackets 9 are respectively arranged at both ends of the chain conveyor 6 and are fixedly connected to the chain conveyor 6 .

[0042] Furthermore, in this embodiment, a layer of belt (not shown) is provided on the chain plates of the chain conveyor 6 to prevent fine particles from entering the gaps between the chain plates.

[0043] Further, if Figure 7 As shown, in this embodiment, a diversion component is further provided on the chain plate of the chain conveyor 6 to spread out the product, so as to further arrange the product evenly on the chain conveyor 6 and make the drying more uniform.

[0044] Further, if Figure 7 As shown, in this embodiment, the diverter assembly includes: a connecting rod 61 and a plurality of diverter rods 62; both ends of the connecting rod 61 are fixedly connected to the fixed bracket 9, and the plurality of diverter rods 62 are respectively fixedly connected to the connecting rod 61.

[0045] Furthermore, in this embodiment, a solenoid valve is provided at each of the feed port and the discharge port of the second storage tank, and the solenoid valve here has a similar function to the solenoid valve of the first storage tank 4 .

[0046] Further, if Figure 1 As shown, in this embodiment, a plurality of cameras 111 are provided on the automatic sealing door 11 , and the cameras 111 correspond to the chain conveyor 6 , and can detect the drying condition of the product inside the cavity 1 in real time.

[0047] Working principle: First, vacuum the cavity 1; then, convey the product from the storage bin 512 to the first storage tank 4 via the first conveyor 3 until it is full; then, the upper solenoid valve of the first storage tank 4 is closed, and the lower solenoid valve is opened, so that the product falls into the silo 51 of the first screw conveyor 5, and then falls evenly onto the chain conveyor 6 through the first discharge hole 511; after drying is completed, it is output to the second storage tank via the second screw conveyor 7 until the second storage tank is full, and then, the upper solenoid valve of the second storage tank is closed, and the lower solenoid valve is opened to release the product.

[0048] Above, refer to Figures 1 to 7 A microwave vacuum low-temperature solid belt dryer according to an embodiment of the utility model is described, which is convenient for observing the drying condition of the internal product; granular solid products such as sand and gravel can be evenly distributed on the chain conveyor 6 to make the heating more uniform; multiple chain conveyors 6 are connected end to end to each other, so that the product stays in the cavity 1 for a longer time and the heating effect is better.

[0049] It should be noted that, in this specification, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the elements.

[0050] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. After reading the above description, various modifications and alternatives to the present invention will be readily apparent to those skilled in the art. Therefore, the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A microwave vacuum low-temperature solid belt dryer, comprising a cavity, with automatic sealing doors provided at both ends of the cavity; characterized in that: Also includes: A storage silo, which is used to store the product to be dried; a first conveyor, wherein an input end of the first conveyor is connected to the storage bin and is used to output the product to be dried from the storage bin; a first material storage tank, which is arranged on the cavity and communicated with the cavity; a feed port is provided at the upper end of the first material storage tank, and the feed port is connected to the output end of the first conveyor; a solenoid valve is provided between the feed port and the first material storage tank, and a solenoid valve is provided between the first material storage tank and the cavity; A first screw conveyor, wherein the first screw conveyor is connected to the first storage tank, and a row of first discharge holes is provided below the silo of the first screw conveyor; A plurality of chain conveyors are sequentially arranged in the cavity and staggered from top to bottom; a second screw conveyor, connected to the chain conveyor at the bottom layer, for outputting the dried product; A second material storage tank is arranged outside the cavity and is connected to the second screw conveyor.

2. The microwave vacuum low-temperature solid belt dryer according to claim 1, characterized in that: A dust cover is provided at the upper end of the first conveyor.

3. The microwave vacuum low-temperature solid belt dryer according to claim 1, characterized in that: Half of the spiral blades of the first screw conveyor rotate to the left, and the other half rotate to the right.

4. The microwave vacuum low-temperature solid belt dryer according to claim 1, characterized in that: A plurality of fixed brackets are respectively arranged at both ends of the chain conveyor and fixedly connected to the chain conveyor.

5. The microwave vacuum low-temperature solid belt dryer according to claim 1 or 4, characterized in that: A layer of belt is provided on the chain plate of the chain conveyor.

6. The microwave vacuum low-temperature solid belt dryer according to claim 4, characterized in that: The chain plates of the chain conveyor are also provided with a diversion component.

7. The microwave vacuum low-temperature solid belt dryer according to claim 6, characterized in that: The diverter assembly comprises: a connecting rod and a plurality of diverter rods; both ends of the connecting rod are fixedly connected to the fixing bracket, and the plurality of diverter rods are respectively fixedly connected to the connecting rod.

8. The microwave vacuum low-temperature solid belt dryer according to claim 1, characterized in that: The feed port and the discharge port of the second storage tank are each provided with a solenoid valve.

9. The microwave vacuum low-temperature solid belt dryer according to claim 1, characterized in that: The automatic sealing door is provided with a plurality of cameras, and the cameras correspond to the chain conveyor.

Images