Feeding and discharging system of vacuum drying machine

Abstract

The utility model discloses a feeding and discharging system of a vacuum drier. The feeding and discharging system comprises a liquid ring vacuum pump, the liquid ring vacuum pump is communicated with a feeding header pipe and a discharging header pipe, the feeding header pipe is communicated with the top of the feeding balance stirring tank through a feeding emptying branch pipe, and the feeding header pipe is communicated with the top of the raw material tank through a feeding balance pipe; and the discharging header pipe is communicated with the top of the discharging balance stirring tank through a discharging emptying branch pipe and is communicated with the vacuum double-paddle drying machine through a discharging balance pipe. The system has the advantages that by controlling the opening and closing sequence of the valves in the system and designing vacuum pressure balance in the system, stable feeding and discharging processes are realized, material leakage and waste are reduced, and meanwhile, the safety of the production process is ensured. According to production requirements, the size of material particles can be accurately controlled by adjusting the rotating speed of the discharging crusher, different process requirements are met, and the product quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of material drying equipment technology, specifically to a vacuum dryer feeding and discharging system. Background Technology

[0002] In the existing dryer feeding and discharging process, two-stage material tanks are connected in series to form a seal through the material accumulation height. However, there are many problems: (1) If the material is piled up too high in the feeding tank and the discharging tank, bridging will easily occur, resulting in poor material flow and affecting production efficiency; (2) The vacuum pressure of the dryer is adjusted by a vacuum pump. In order to prevent material bridging, the material storage height in the two-stage material tank will be reduced. However, the material height will be reduced, resulting in poor sealing between the materials and air leakage. This will lead to the dryer vacuum not being guaranteed and affecting the drying effect of the material; (3) There is a lack of effective dust treatment measures, which not only pollutes the environment but may also affect the normal operation of the equipment and product quality; In addition, it is difficult to accurately control the particle size of the material, which cannot meet the needs of different production processes. Utility Model Content

[0003] The purpose of this invention is to provide a vacuum dryer feeding and discharging system to solve the problems of material bridging in the tank, unstable pressure control, improper dust handling, and difficulty in controlling the particle size of materials, thereby achieving an efficient, stable, and environmentally friendly drying production process.

[0004] This utility model is implemented by the following technical solution: a vacuum dryer feeding and discharging system, comprising a liquid ring vacuum pump and a feeding mixing tank, a feeding balancing mixing tank, a raw material tank, a twin-screw conveyor, a vacuum twin-paddle dryer, a discharge crusher, a discharge mixing tank, and a discharge balancing mixing tank connected in sequence; a first feed valve is installed on the pipeline between the feeding mixing tank and the feeding balancing mixing tank, and a second feed valve is installed on the pipeline between the feeding balancing mixing tank and the raw material tank; a first discharge valve is installed on the pipeline between the discharge mixing tank and the discharge balancing mixing tank, and a second discharge valve is installed at the outlet of the discharge balancing mixing tank; the liquid ring vacuum pump is connected to... The system has a main feed pipe and a main discharge pipe. The main feed pipe is connected to the top of the feed balancing mixing tank via a feed vent branch pipe, and is also connected to the top of the raw material tank via a feed balancing pipe. A first feed balancing valve is installed on the main feed pipe, a feed vent valve is installed on the feed vent branch pipe, and a second feed balancing valve is installed on the feed balancing pipe. The main discharge pipe is connected to the top of the discharge balancing mixing tank via a discharge vent branch pipe, and is also connected to the vacuum twin-blade dryer via a discharge balancing pipe. A first discharge balancing valve is installed on the main discharge pipe, and a second discharge balancing valve and a discharge vent valve are installed on the discharge balancing pipe.

[0005] Furthermore, dust filters are installed on both the feed vent branch pipe and the discharge vent branch pipe.

[0006] Furthermore, differential pressure sensors are installed at the inlet and outlet of the dust filter.

[0007] The advantages of this utility model are: the feeding mixing tank, the feeding balancing mixing tank, the raw material tank, the discharging mixing tank, and the discharging balancing mixing tank are all equipped with a mixing device, which effectively avoids material bridging in the tank, ensures smooth material flow, and improves production efficiency.

[0008] By controlling the opening and closing sequence of each valve in the system and designing the vacuum pressure balance in the system, a stable feeding and discharging process is achieved, reducing material leakage and waste, while ensuring the safety of the production process.

[0009] Based on production needs, the speed of the discharge crusher can be adjusted to precisely control the particle size of materials, meet different process requirements, and improve product quality.

[0010] The installation of dust filters and differential pressure sensors enables effective dust control and timely cleaning of dust filters, improving the working environment and extending the service life of the equipment. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] In the diagram: 1. Feeding mixing tank; 2. Feeding balancing mixing tank; 3. Raw material tank; 4. Twin-screw conveyor; 5. Vacuum twin-paddle dryer; 6. Discharge crusher; 7. Discharge mixing tank; 8. Discharge balancing mixing tank; 9. First feed valve; 10. Second feed valve; 11. First discharge valve; 12. Second discharge valve; 13. Liquid ring vacuum pump; 14. Feed main pipe; 15. Discharge main pipe; 16. Feed vent branch pipe; 17. Feed balancing pipe; 18. First feed balancing valve; 19. Feed vent valve; 20. Second feed balancing valve; 21. Discharge vent branch pipe; 22. Discharge balancing pipe; 23. First discharge balancing valve; 24. Second discharge balancing valve; 25. Discharge vent valve; 26. Dust filter; 27. Differential pressure sensor. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] like Figure 1 As shown, a vacuum dryer feeding and discharging system includes a liquid ring vacuum pump 13 and, in sequence, a feeding mixing tank 1, a feeding balancing mixing tank 2, a raw material tank 3, a twin-screw conveyor 4, a vacuum twin-paddle dryer 5, a discharge crusher 6, a discharge mixing tank 7, and a discharge balancing mixing tank 8. The feeding mixing tank 1 and the feeding balancing mixing tank 2 each have a volume of 400 liters, the raw material tank 3 each has a volume of 2000 liters, the discharge mixing tank 7 has a volume of 600 liters, and the discharge balancing mixing tank 8 has a volume of 800 liters. Each of the feeding mixing tank 1, the feeding balancing mixing tank 2, the raw material tank 3, the discharge mixing tank 7, and the discharge balancing mixing tank 8 is equipped with a mixing device to prevent material bridging. The mixing device and the vacuum twin-paddle dryer 5 are existing technologies, and their specific structures will not be described in detail. During the drying process in the vacuum twin-paddle dryer 5, the material may clump together; the discharge crusher 6 is used to crush the clumped material.

[0016] A first feed valve 9 is installed on the pipeline between the feed mixing tank 1 and the feed balancing mixing tank 2, and a second feed valve 10 is installed on the pipeline between the feed balancing mixing tank 2 and the raw material tank 3. The liquid ring vacuum pump 13 is connected to the feed main pipe 14 and the discharge main pipe 15. The feed main pipe 14 is connected to the top of the feed balancing mixing tank 2 through the feed vent branch pipe 16, and the feed main pipe 14 is connected to the top of the raw material tank 3 through the feed balancing pipe 17. A first feed balancing valve 18 is installed on the feed main pipe 14, a feed vent valve 19 is installed on the feed vent branch pipe 16, and a second feed balancing valve 20 is installed on the feed balancing pipe 17.

[0017] Feeding process: Turn on the stirring devices in the feeding mixing tank 1, the feeding balance mixing tank 2, and the raw material tank 3, and turn on the double screw conveyor 4 and the liquid ring vacuum pump 13; open the feeding vent valve 19 to vent the feeding balance mixing tank 2 to normal pressure, and then open the first feeding valve 9. The material in the feeding mixing tank 1 falls into the feeding balance mixing tank 2 by gravity. After the required process time is reached, close the first feeding valve 9 and the feeding vent valve 19.

[0018] After opening the first feed balancing valve 18 for a set time, the vacuum inside the feed balancing mixing tank 2 meets the process requirements. Then, the first feed balancing valve 18 is closed, and the second feed balancing valve 20 is opened to balance the vacuum pressure between the feed balancing mixing tank 2 and the raw material tank 3. Finally, the second feed valve 10 is opened, and the material falls from the feed balancing mixing tank 2 into the raw material tank 3 under gravity. The second feed balancing valve 20 and the second feed valve 10 are then closed. This process completes one feeding cycle. Repeating this process completes the feeding operation. The opening time of each valve within each cycle is adjustable, depending on the on-site feed volume.

[0019] The material in the raw material tank 3 is fed into the vacuum double-paddle dryer 5 by the double helix conveyor 4 for drying. The feeding speed into the vacuum double-paddle dryer 5 is controlled by adjusting the rotation speed of the double helix conveyor 4.

[0020] A first discharge valve 11 is installed on the pipeline between the discharge mixing tank 7 and the discharge balancing mixing tank 8, and a second discharge valve 12 is installed at the outlet of the discharge balancing mixing tank 8; the discharge main pipe 15 is connected to the top of the discharge balancing mixing tank 8 through the discharge venting branch pipe 21, and the discharge main pipe 15 is connected to the vacuum double-paddle dryer 5 through the discharge balancing pipe 22; a first discharge balancing valve 23 is installed on the discharge main pipe 15, and a second discharge balancing valve 24 and a discharge venting valve 25 are installed on the discharge balancing pipe 22.

[0021] Discharge process: Turn on the stirring devices of discharge mixing tank 7 and discharge balance mixing tank 8, and turn on discharge crusher 6 and liquid ring vacuum pump 13; the material dried by vacuum double paddle dryer 5 falls into discharge crusher 6, and the size of crushed particles is controlled by adjusting the speed of discharge crusher 6, and the crushed material falls into discharge mixing tank 7.

[0022] Open the first discharge balance valve 23. Under the action of the liquid ring vacuum pump 13, evacuate the discharge balance mixing tank 8. After the vacuum in the discharge balance mixing tank 8 meets the process requirements, close the first discharge balance valve 23 and open the second discharge balance valve 24 to balance the vacuum pressure in the discharge balance mixing tank 8 with that in the vacuum twin-paddle dryer 5. Open the first discharge valve 11 to allow the material in the discharge mixing tank 7 to fall into the discharge balance mixing tank 8. Then close the second discharge balance valve 24 and the first discharge valve 11. Open the discharge vent valve 25 to vent to atmospheric pressure. Finally, open the second discharge valve 12 to discharge the material, completing one discharge cycle. Repeat the above process. The opening time of each valve in each cycle is adjustable and can be adjusted according to the discharge volume on site.

[0023] Dust filters 26 are installed on both the feed vent branch pipe 16 and the discharge vent branch pipe 21 to effectively treat dust. Differential pressure sensors 27 are installed at the inlet and outlet of the dust filter 26. When the differential pressure sensor 27 detects a large pressure difference between the inlet and outlet of the corresponding dust filter 26, it indicates that the corresponding dust filter 26 is blocked and needs to be cleaned to ensure the air quality in the system and reduce dust pollution.

[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vacuum dryer feeding and discharging system, characterized in that, It includes a liquid ring vacuum pump and a feed mixing tank, a feed balancing mixing tank, a raw material tank, a twin-screw conveyor, a vacuum twin-paddle dryer, a discharge crusher, a discharge mixing tank, and a discharge balancing mixing tank connected in sequence. A first feed valve is installed on the pipeline between the feed mixing tank and the feed balancing mixing tank, and a second feed valve is installed on the pipeline between the feed balancing mixing tank and the raw material tank; a first discharge valve is installed on the pipeline between the discharge mixing tank and the discharge balancing mixing tank, and a second discharge valve is installed at the outlet of the discharge balancing mixing tank. The liquid ring vacuum pump is connected to a feed main pipe and a discharge main pipe. The feed main pipe is connected to the top of the feed balance mixing tank through a feed vent branch pipe, and the feed main pipe is connected to the top of the raw material tank through a feed balance pipe. A first feed balance valve is installed on the feed main pipe, a feed vent valve is installed on the feed vent branch pipe, and a second feed balance valve is installed on the feed balance pipe. The main discharge pipe is connected to the top of the discharge balance mixing tank through a discharge vent branch pipe, and the main discharge pipe is connected to the vacuum double-paddle dryer through a discharge balance pipe; a first discharge balance valve is installed on the main discharge pipe, and a second discharge balance valve and a discharge vent valve are installed on the discharge balance pipe.

2. The vacuum dryer feeding and discharging system according to claim 1, characterized in that: Dust filters are installed on both the feed vent branch pipe and the discharge vent branch pipe.

3. The vacuum dryer feeding and discharging system according to claim 2, characterized in that: Differential pressure sensors are installed at the inlet and outlet of the dust filter.

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