Planetary mixer capable of feeding powder from tank bottom

Abstract

The utility model relates to a planetary stirrer with powder fed from the bottom of a tank, which comprises a vacuum system and a stirring tank communicated with the vacuum system, and further comprises a tank bottom material blocking cylinder, a powder storage tank and a weighing module used for weighing the weight of powder in the powder storage tank, the tank bottom material blocking cylinder is connected with the powder feeding port through a connecting pipe, the powder feeding port is blocked when a piston of the tank bottom material blocking cylinder is in a stretching-out state, the connecting pipe is further connected with a tank bottom feeding adjusting valve, and the tank bottom feeding adjusting valve is communicated with the powder storage tank through a conveying pipeline. According to the planetary stirrer, powder is fed from the side face of the bottom of the stirring tank, the powder is in contact with liquid fed firstly after entering, little powder can fly out of the upper portion of the liquid level, dust flying in the stirring tank can be reduced, the influence of dust flying on a bearing and a sealing piece on the upper portion of the stirrer is reduced, the service life of equipment is prolonged, and the maintenance period of the equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to a planetary mixer, in particular to a planetary mixer with powder feeding from the bottom of a tank. Background Art

[0002] At present, in the production of chemical industry, electronic slurry and other industries, planetary mixers are often used to mix materials (liquids and powders). After the liquid is put into the mixing tank, the powder is transported by pipeline into the mixer. The material is pneumatically conveyed or free-falling, and enters the mixing tank of the mixer from the powder feeding interface of the upper barrel of the mixing tank. However, when the material is fed, dust will be generated due to factors such as material density, pneumatic conveying method, and pressure changes in the mixer tank, resulting in a large amount of dust in the mixer tank, causing the material to adhere to the lower part of the planetary box and the upper barrel wall of the mixer, so that manual scraping is required after the feeding is completed. In addition, due to the change in pressure in the mixing tank, the powder can easily enter the inside of the planetary box of the mixer, causing the mechanical parts such as bearings and mechanical seals to enter the dust, which greatly reduces the service life of the parts and greatly shortens the equipment maintenance cycle. For some high-demand continuous production industries, it greatly affects the production capacity of a series of back-end processes.

[0003] Among the existing published patent documents, Chinese patent application 2014107998108 discloses a solid-liquid mixing device, which includes a kettle, a vacuum exhaust pipe, a liquid feeding pipe and a powder pipe. One end of the powder pipe is connected to a powder feed port provided at the bottom of the kettle. The device is a reactor, which belongs to a different technical field from the planetary mixer. Its structure does not have components similar to planetary boxes that have high dustproof requirements. It adds powder materials from the bottom of the kettle in order to reduce the possibility of powder agglomeration when entering the liquid, not to prevent dust from flying and damaging components. In addition, there are no adjustment-related components on the powder pipe. When the solid-gas ratio fluctuates and the pressure in the tank fluctuates when adding powder, it cannot be guaranteed that the liquid will not flow back into the pipe, causing the powder-liquid mixture to agglomerate and block the pipe, and the feeding stability is poor. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a planetary mixer with powder feeding from the bottom of the tank. The powder material enters from the bottom side of the mixing tank, which can reduce the contact between the dust and the upper part of the mixing tank, reduce the adverse effect of flying dust on the upper bearings and seals of the mixer, and the pressure in the powder feeding pipeline is adjustable, so the feeding is stable and reliable.

[0005] The technical solution to solve the above technical problems is: a planetary mixer with powder feeding from the bottom of a tank, including a vacuum system and a mixing tank connected to the vacuum system, and also including a tank bottom blocking cylinder, a powder storage tank and a weighing module for weighing the powder in the powder storage tank. A powder feed port is opened on the bottom side of the mixing tank, and the tank bottom blocking cylinder is connected to the powder feed port through a connecting pipe. The powder feed port is blocked when the piston of the tank bottom blocking cylinder is in an extended state. A tank bottom feed regulating valve is also connected to the connecting pipe, and the tank bottom feed regulating valve is connected to the powder storage tank through a conveying pipe.

[0006] Furthermore, it also includes a breathing filter tank, and the stirring tank is connected to the vacuum system through the breathing filter tank.

[0007] Furthermore, it also includes a control system for controlling the actions of the breathing filter tank, the tank bottom feed regulating valve and the tank bottom blocking cylinder.

[0008] Furthermore, a monitoring pressure sensor is installed on the stirring tank, and the control system adjusts the opening angle of the tank bottom feed regulating valve in real time by monitoring the pressure inside the stirring tank collected by the monitoring pressure sensor.

[0009] Furthermore, the control system collects the weight of the powder in the powder storage tank through the weighing module, and controls the closing of the tank bottom feed regulating valve and the tank bottom blocking cylinder according to the powder weight.

[0010] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0011] 1. The powder is fed from the bottom side of the mixing tank. After the powder enters, it contacts with the liquid put in first. Under the stirring action of the stirring parts, the powder entering the mixing tank is better in contact with the liquid and blended. Very little powder flies out of the upper part of the liquid surface, which can reduce the contact between the dust and the upper part of the mixing tank, the upper barrel and the sealing parts, reduce the flying dust in the mixing tank, and reduce the impact of the flying dust on the upper bearings and seals of the mixer, thereby increasing the service life of the equipment and extending the equipment maintenance cycle.

[0012] 2. Since the contact between the powder and the upper barrel is reduced, the proportion of unmixed powder is further reduced, the material consistency is improved, and the production quality is improved.

[0013] 3. The feeding method on the side of the tank bottom improves the efficiency of powder mixing with liquid during feeding, accelerates the powder-liquid mixing speed in the mixer, indirectly shortens the process mixing time, and improves product production efficiency.

[0014] 4. The powder feed pipeline is connected to the closed powder storage tank, and a tank bottom feed regulating valve is provided on the pipeline to adjust the feed flow rate. When the solid-gas ratio feed in the pipeline is unstable, the pressure in the mixing tank is stabilized to ensure that the pressure change rate area in the tank is stable, so that the liquid cannot flow back into the pipeline, making the feeding more stable.

[0015] 5. A weighing module is provided for weighing the powder in the powder storage tank. The operator can understand the feeding status of the powder through the weighing module. The system can automatically judge the completion of material addition through the weighing module, realize automatic opening and closing of valves and automatic next step of material mixing.

[0016] The technical features of the planetary mixer with powder feeding from the bottom of the tank of the utility model will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 : A schematic diagram of a planetary mixer with powder feeding from the bottom of a tank according to the present invention.

[0018] In the figure: 1-mixing tank, 2-breathing filter tank, 3-tank bottom blocking cylinder, 4-tank bottom feed regulating valve, 5-weighing module, 6-powder storage tank, 7-connecting pipe, 8-powder feed port.

[0019] P represents the liquid level. DETAILED DESCRIPTION Embodiment 1:

[0020] A planetary mixer with powder feeding from the bottom of the tank, such as Figure 1 As shown, it includes a vacuum system (not shown) and a stirring tank 1 connected to the vacuum system, and also includes a tank bottom blocking cylinder 3, a powder storage tank 6 and a weighing module 5 for weighing the powder in the powder storage tank 6. A powder feed port 8 is opened on the bottom side of the stirring tank 1. The tank bottom blocking cylinder 3 is connected to the powder feed port 8 through a connecting pipe 7. When the piston of the tank bottom blocking cylinder 3 is in an extended state, the powder feed port 8 is blocked to close the powder feed port 8. The connecting pipe 7 is also connected to a tank bottom feeding regulating valve 4, which is connected to the powder storage tank 6 through a conveying pipeline. The powder storage tank 6 controls the amount of material fed into the stirring tank 1 through the tank bottom feeding regulating valve 4.

[0021] In this embodiment, a breathing filter tank 2 is also included, and the stirring tank 1 is connected to the vacuum system through the breathing filter tank 2. A control system (not shown in the figure) is also included for controlling the action of the breathing filter tank, the tank bottom feed regulating valve and the tank bottom blocking cylinder. A monitoring pressure sensor (not shown in the figure) is installed on the stirring tank 1 to collect the pressure in the stirring tank 1. The control system adjusts the opening angle of the tank bottom feed regulating valve 4 in real time by monitoring the pressure in the stirring tank collected by the pressure sensor. The control system generates negative pressure in the stirring tank 1 through the breathing filter tank 2, and monitors the pressure in the stirring tank in real time through the monitoring pressure sensor. The pressure is kept constant within the set range by adjusting the opening angle of the feed regulating valve 4, so that the powder does not break through the liquid in large quantities and diffuse above the liquid surface in the stirring tank.

[0022] In this embodiment, the control system collects the weight of the powder in the powder storage tank 6 through the weighing module 5, and controls the closing of the tank bottom feed regulating valve 4 and the tank bottom blocking cylinder 3 according to the weight of the powder. That is, the control system monitors the material amount of the powder storage tank 6 through the weighing module 5. When the material is transported, the control system controls the closing of the tank bottom feed regulating valve 4 and the tank bottom blocking cylinder 3. When the tank bottom blocking cylinder is closed, a small amount of material overflowing into the connecting pipe 7 is pushed into the mixing tank.

[0023] In this embodiment, a mixing tank, a breathing filter tank, a tank bottom blocking cylinder, and a tank bottom feed regulating valve are used to form a receiving system, and a weighing module and a powder storage tank group form a powder metering feeding system. The negative pressure system is connected through the ball valve at the upper end of the breathing filter tank to generate negative pressure in the mixing tank, and the pressure value in the mixing tank is monitored in real time. When the negative pressure value reaches the set value, the tank bottom blocking cylinder is opened, and the angle of the tank bottom feed regulating valve is adjusted to keep the pressure in the mixing tank within the set negative pressure range, so that negative pressure is generated in the powder conveying pipeline, and a pressure difference is generated at the left and right ends of the discharge port at the bottom of the powder storage tank, which promotes the powder to mix with the gas, enter the conveying pipeline, and be brought into the mixing tank to contact the liquid first. At this time, the dispersion disk of the stirring component set in the mixing tank rotates, so that the powder entering the mixing tank can better contact and blend with the liquid, and the solid and gas are separated in the mixing tank, and the gas is extracted from the breathing filter tank, and the solid powder remains in the mixing tank. The weighing module is used to detect the amount of powder in the powder storage tank in real time. After all the materials are transported to the mixer, the bottom sealing cylinder of the mixing tank is closed to complete the transportation.

Claims

1. A planetary mixer with powder feeding from the bottom of the tank, comprising a vacuum system and a mixing tank (1) connected to the vacuum system, characterized in that: It also includes a tank bottom blocking cylinder (3), a powder storage tank (6) and a weighing module (5) for weighing the powder in the powder storage tank. A powder feed port (8) is provided on the bottom side of the mixing tank. The tank bottom blocking cylinder is connected to the powder feed port via a connecting pipe (7). When the piston of the tank bottom blocking cylinder is in an extended state, the powder feed port is blocked. The connecting pipe is also connected to a tank bottom feed regulating valve (4). The tank bottom feed regulating valve is connected to the powder storage tank via a conveying pipeline.

2. A planetary mixer with powder feeding from the bottom of the tank according to claim 1, characterized in that: It also includes a breathing filter tank (2), and the stirring tank is connected to the vacuum system via the breathing filter tank.

3. A planetary mixer with powder feeding from the bottom of the tank according to claim 2, characterized in that: The utility model also comprises a control system for controlling the actions of the breathing filter tank, the tank bottom feed regulating valve and the tank bottom blocking cylinder.

4. A planetary mixer with powder feeding from the bottom of the tank according to claim 3, characterized in that: A monitoring pressure sensor is installed on the stirring tank, and the control system adjusts the opening angle of the tank bottom feed regulating valve in real time by monitoring the pressure inside the stirring tank collected by the monitoring pressure sensor.

5. A planetary mixer with powder feeding from the bottom of the tank according to claim 3 or 4, characterized in that: The control system collects the weight of the powder in the powder storage tank through the weighing module, and controls the closing of the tank bottom feed regulating valve and the tank bottom blocking cylinder according to the powder weight.

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