Powder feeding and mixing device

Abstract

This utility model discloses a powder feeding and mixing device, relating to the field of powder dispensing technology. The device includes: a powder tank for containing powder raw materials; and a compounding tank connected to the powder tank via a supply pipe. The compounding tank is provided with a negative pressure hole for connecting to a negative pressure mechanism that maintains negative pressure in the compounding tank. A filter screen is provided at the negative pressure hole to filter floating matter in the airflow entering the negative pressure mechanism. This powder feeding and mixing device maintains negative pressure inside the compounding tank, preventing the overflow of suspended matter. The powder tank and the compounding tank are connected via the supply pipe, and the powder is fed using the pressure difference between the two tanks. During the process, the powder raw materials are not exposed to the external environment, thus preventing the powder raw materials from floating and diffusing into the external environment during feeding.

Description

Technical Field

[0001] This utility model relates to the field of powder dispensing technology, and more specifically, to a powder dispensing and mixing device. Background Technology

[0002] In factories, powder particles and liquid materials are often mixed, that is, powder particles and liquid phases are mixed into a stirred tank for mixing (or reaction) and used as a formula liquid for production materials;

[0003] However, due to their small particle size, light weight, and irregular shape, powder particles are prone to floating and spreading into the air during the feeding process. In particular, when feeding is carried out in a confined space, the concentration of suspended matter in the air can reach the standard for powder explosion in a short period of time, posing a significant safety hazard.

[0004] To avoid powder explosions, current technologies mostly use vacuum cleaners to continuously adsorb and collect powder from the air. This requires additional equipment and energy consumption, and the collection effect is limited. At the same time, it cannot fundamentally solve the problem of powder floating and spreading during the powder addition process.

[0005] In summary, how to solve the problem of floating and diffusion during powder addition is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a powder feeding and mixing device that maintains negative pressure inside the compounding tank to prevent the overflow of suspended matter in the compounding tank. The powder tank and the compounding tank are connected by a feeding pipe. The powder is fed and dispensed by utilizing the pressure difference between the powder tank and the compounding tank. During the process, the powder raw materials will not be exposed to the external environment, that is, the powder raw materials are prevented from floating and spreading to the external environment during the feeding and dispensing process.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A powder feeding and mixing device, comprising:

[0009] Powder container, used to hold powdered raw materials;

[0010] The compounding tank is connected to the powder tank via a feeding pipe. The compounding tank is provided with a negative pressure hole for connecting to a negative pressure mechanism that can maintain negative pressure in the compounding tank.

[0011] The negative pressure hole is equipped with a filter screen to filter floating objects in the airflow entering the negative pressure mechanism.

[0012] Preferably, the powder feeding and mixing device further includes a valve for controlling the on / off flow of fluid in the feed pipe;

[0013] The inlet end of the feed pipe is connected to the powder tank, and the outlet end is connected to the compounding tank. The vertical height of the inlet end of the feed pipe is higher than that of the outlet end.

[0014] Preferably, an on / off control mechanism is provided between the compounding tank and the negative pressure mechanism;

[0015] And / or, the negative pressure mechanism includes a centrifugal fan with controllable operating status.

[0016] Preferably, the top of the powder container is provided with a connecting pipe that connects the compounding container and / or the feeding pipe;

[0017] Furthermore, an on / off control mechanism is connected in series inside the conductive tube.

[0018] Preferably, the powder feeding and mixing device further includes a liquid tank, which is connected to the compounding tank, and a pump body is provided in the passage between the liquid tank and the compounding tank;

[0019] The pump body is a metering pump, used to accurately measure the amount of liquid added from the liquid tank to the compounding tank.

[0020] Preferably, the upper inner layer of the compounding tank is provided with a nozzle and a powder filling port; the powder filling port is connected to the outlet of the feed pipe, and the nozzle is connected to the outlet of the pump body;

[0021] Furthermore, the discharge area of ​​the powder filling port overlaps with the spraying area of ​​the nozzle.

[0022] Preferably, the nozzle is a liquid phase porous nozzle ring, and the liquid phase porous nozzle ring surrounds the powder filling port;

[0023] A conical cover is provided at the powder filling port to block the spray path of the nozzle directly spraying towards the powder filling port.

[0024] Preferably, a stirring mechanism is provided in the lower layer inside the compounding tank, and a discharge port is provided at the bottom of the compounding tank.

[0025] Preferably, a three-way reversing valve is provided at the negative pressure port. The three ports of the three-way reversing valve are respectively used to connect the negative pressure port, the negative pressure mechanism and the positive pressure purging air source, so as to selectively connect the negative pressure port with the negative pressure mechanism and the positive pressure purging air source.

[0026] Preferably, the upper layer of the compounding tank is provided with a plurality of negative pressure holes, and each negative pressure hole is connected to an independently controllable three-way reversing valve.

[0027] The powder feeding and mixing device provided by this utility model has at least the following advantages compared with the prior art:

[0028] 1. The compounding tank is equipped with a negative pressure hole, which is connected to a negative pressure mechanism to maintain negative pressure inside the compounding tank, thereby preventing suspended matter inside the compounding tank from overflowing and solving the problem of powder raw materials floating and diffusing into the outside air during compounding.

[0029] 2. The powder tank is connected to the compounding tank through a feed pipe. When there is a pressure difference between the powder tank and the compounding tank, the pressure difference can drive the powder raw material in the powder tank to enter the compounding tank through the feed pipe. During the process, the powder raw material does not come into contact with the outside air, so there is no problem of the powder raw material floating and diffusing into the outside air, thus solving the problem of floating and diffusing when the powder raw material is added. Attached Figure Description

[0030] 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the specific powder feeding and mixing device provided by this utility model;

[0032] Figure 2 This is a schematic diagram showing the assembly of the compounding tank, filter screen, and three-way reversing valve provided by this utility model.

[0033] Figure 3 Provided by this utility model Figure 1 Enlarged view of point A in the middle.

[0034] In the picture:

[0035] 1. Powder container; 11. Connecting pipe; 12. Feeding pipe; 13. Valve;

[0036] 2. Liquid tank; 21. Pump body;

[0037] 3. Compound mixing tank; 31. Cover; 32. Nozzle; 33. Discharge port; 34. Filter screen; 35. Three-way reversing valve;

[0038] 4. Mixing mechanism;

[0039] 5. Negative pressure mechanism. Detailed Implementation

[0040] 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.

[0041] The core of this utility model is to provide a powder feeding and mixing device. By maintaining negative pressure inside the compounding tank, the device prevents the overflow of suspended matter inside the compounding tank. The powder tank and the compounding tank are connected by a feeding pipe. The powder is fed and dispensed by utilizing the pressure difference between the powder tank and the compounding tank. During the process, the powder raw materials are not exposed to the external environment, thus preventing the powder raw materials from floating and spreading to the external environment during the feeding and dispensing process.

[0042] Please refer to Figure 1 A powder feeding and mixing device, comprising:

[0043] Powder container 1, used to hold powder raw materials;

[0044] The compounding tank 3 is connected to the powder tank 1 via the feeding pipe 12. The compounding tank 3 is provided with a negative pressure hole for connecting to a negative pressure mechanism 5 that can maintain negative pressure in the compounding tank 3.

[0045] The negative pressure hole is equipped with a filter screen 34, which is used to filter floating objects in the airflow entering the negative pressure mechanism 5.

[0046] like Figure 1 As shown, the compounding tank 3 adopts a sealed design and is connected to the negative pressure mechanism 5 through a negative pressure hole to form a negative pressure inside the compounding tank 3, thereby preventing the gas inside the compounding tank 3 from leaking out, which in turn prevents the powder suspension inside the compounding tank 3 from leaking out.

[0047] Meanwhile, the powder tank 1 and the compounding tank 3 are connected by the feed pipe 12. The powder in the powder tank 1 can enter the compounding tank 3 through the feed pipe 12. When the feed pipe 12 is open, the powder tank 1 and the compounding tank 3 can be under negative pressure simultaneously, which prevents the powder suspended matter in the powder tank 1 from leaking out. It is worth noting that the powder tank 1 should be provided with a channel for external gas to enter in order to reduce the pressure difference between the inside and outside of the powder tank 1.

[0048] Meanwhile, under the continuous action of the negative pressure mechanism 5, the negative pressure in the compounding tank 3 continues to increase, that is, there is a certain pressure difference between the compounding tank 3 and the powder tank 1. This pressure difference can serve as the driving force for the powder raw materials in the powder tank 1 to enter the compounding tank 3 through the feeding pipe 12. In other words, it ensures that when the powder raw materials are added from the powder tank 1 to the compounding tank 3, the powder raw materials do not need to come into contact with the external environment, thus avoiding the problem of the powder raw materials floating and diffusing into the external environment during the adding process.

[0049] Furthermore, a filter screen 34 is installed at the negative pressure hole of the compounding tank 3 to filter the airflow passing through the negative pressure hole, preventing the powder suspension carried in the airflow from entering the negative pressure mechanism 5 together. After the airflow is filtered by the filter screen 34, the internal particulate matter is significantly reduced. Then the airflow enters the exhaust gas treatment system for unified treatment before being discharged, further reducing the particulate suspension entering the outside world and reducing environmental pollution.

[0050] In some embodiments, the powder feeding and mixing device further includes a valve 13 for controlling the on / off flow of fluid in the feed pipe 12;

[0051] The inlet end of the feed pipe 12 is connected to the powder tank 1, and the outlet end is connected to the compounding tank 3. The vertical height of the inlet end of the feed pipe 12 is higher than that of the outlet end.

[0052] like Figure 1 As shown, for flake-shaped powder raw materials, their own fluidity is poor, and the flow resistance is large when they are transported through pipelines. Therefore, in the design, the powder tank 1 is raised so that the outlet of the powder tank 1 is higher than the inlet of the compounding tank 3. That is, during the powder filling process, gravity can be used to offset part of the flow resistance to ensure the stability of powder filling.

[0053] Meanwhile, a valve 13 is connected in series at any position in the powder tank 1 outlet, the compounding tank 3 inlet, and the feed pipe 12 to control the flow of fluid in the feed pipe 12, thereby controlling the time it takes for the powder raw material to enter the compounding tank 3 through the feed pipe 12. Since the cross-sectional area of ​​the feed pipe 12 for the powder raw material to pass through is fixed, when the driving force for the powder raw material to be added through the feed pipe 12 is constant, the mass of powder raw material added through the feed pipe 12 per unit time is fixed. That is, by controlling the conduction time of the feed pipe 12, the amount of powder raw material added can be precisely controlled.

[0054] Therefore, the stable operation of the negative pressure mechanism 5 ensures the stability of the pressure difference between the powder tank 1 and the compounding tank 3.

[0055] In some embodiments, an on / off control mechanism is provided between the compounding tank 3 and the negative pressure mechanism 5;

[0056] And / or, the negative pressure mechanism 5 includes a centrifugal fan with controllable operating status.

[0057] By setting an on / off control mechanism between the compound mixing tank 3 and the negative pressure mechanism 5, or by using a centrifugal fan with controllable working conditions as the negative pressure mechanism 5, the purpose is to make the negative pressure state in the compound mixing tank 3 adjustable and controllable, so as to ensure that the pressure difference between the compound mixing tank 3 and the powder tank 1 is constant, or always within the range allowed by the working conditions.

[0058] In some embodiments, the top of the powder tank 1 is connected to a conduit 11 that connects to the compounding tank 3 and / or the feeding pipe 12;

[0059] Furthermore, a switching control mechanism is connected in series inside the conductive tube 11.

[0060] like Figure 1 As shown, when adding powder raw materials to powder tank 1, even if powder tank 1 is closed in time to isolate it from the external environment, there will still be a large amount of suspended particles inside powder tank 1, which poses a risk of overflow. Therefore, a guide pipe 11 is installed on the top of powder tank 1 to connect it with compound tank 3 and / or supply pipe 12. When the on / off control mechanism is activated, the negative pressure in compound tank 3 or supply pipe 12 is used to draw the powder suspension in the upper layer of powder tank 1 into compound tank 3.

[0061] Meanwhile, when the guide pipe 11 is connected to the feed pipe 12, the guide pipe 11 and the feed pipe 12 can share the valve 13 for control. That is, the valve 13 serves as the on / off control mechanism for the guide pipe 11, requiring that the guide pipe 11 be connected to the feed pipe 12 at the upstream end of the valve 13.

[0062] In some embodiments, the powder feeding and mixing device further includes a liquid tank 2, which is connected to a compounding tank 3, and a pump body 21 is provided in the passage between the liquid tank 2 and the compounding tank 3.

[0063] Pump body 21 is a metering pump, used to accurately measure the amount of liquid added from liquid tank 2 to compounding tank 3.

[0064] like Figure 1 As shown, in actual use, powder filling is often accompanied by liquid filling, and the liquid and powder need to be mixed in proportion. Therefore, a liquid tank 2 is added, and a metering pump is used for liquid filling to ensure the accuracy of the liquid filling amount and to mix it with the accurately filled powder raw materials to ensure the accurate mixing ratio.

[0065] Among them, the metering pump is preferably a pneumatic diaphragm pump, which is driven by high-pressure gas and has no electrical sparks in the process, thus avoiding dust explosions and ensuring production safety.

[0066] In some embodiments, the upper inner layer of the compounding tank 3 is provided with a nozzle 32 and a powder filling port; the powder filling port is connected to the outlet of the feed pipe 12, and the nozzle 32 is connected to the outlet of the pump body 21.

[0067] Furthermore, the discharge area of ​​the powder filling port overlaps with the spraying area of ​​the nozzle 32.

[0068] like Figure 1As shown, when the powder is added, it enters the compounding tank 3 in a dispersed manner. A large amount of powder is suspended in the upper part of the tank and cannot fall in time, which affects its mixing with the liquid. Therefore, a nozzle 32 is added to the tank, and the spraying path of the nozzle 32 overlaps at least partially with the discharge area of ​​the powder filling port, so that the powder entering the compounding tank 3 can collide and contact with the liquid sprayed by the nozzle 32, thereby causing the powder to be adhered and wetted by the liquid, increasing its weight and viscosity, and then falling to the bottom of the tank, reducing the suspended particulate matter in the tank.

[0069] In some embodiments, the nozzle 32 is a liquid phase porous nozzle ring, and the liquid phase porous nozzle ring surrounds the powder filling port;

[0070] A conical cover 31 is provided at the powder filling port to block the spray path of the nozzle 32 directly spraying towards the powder filling port.

[0071] like Figure 3 As shown, the nozzle 32 adopts a liquid phase porous nozzle ring to increase its spraying area and improve the coverage of the powder filling port discharge area, so as to ensure that the powder entering the compounding tank 3 can quickly come into contact with the liquid and fall.

[0072] Meanwhile, a conical cover 31 is installed at the powder filling port to partially block the spray path of the nozzle 32, preventing liquid from directly entering the powder filling port, thereby preventing the powder from caking at the powder filling port and avoiding blockage.

[0073] In some embodiments, a stirring mechanism 4 is provided in the lower part of the compounding tank 3, and a discharge port 33 is provided at the bottom of the compounding tank 3.

[0074] The mixing mechanism 4 is preferably a high-speed shear homogenizer, which helps to fully mix the powder and liquid, improves the homogenization efficiency, and a discharge port 33 is set at the bottom of the compounding tank 3 so that the material can be discharged from the discharge port 33 after homogenization is completed.

[0075] In some embodiments, a three-way reversing valve 35 is provided at the negative pressure port. The three ports of the three-way reversing valve 35 are respectively used to connect the negative pressure port, the negative pressure mechanism 5 and the positive pressure purging air source, so as to selectively connect the negative pressure port with the negative pressure mechanism 5 and the positive pressure purging air source.

[0076] During operation, a large number of suspended particles will adhere to the surface of the filter screen 34, causing the filter screen 34 to become clogged, which in turn affects the negative pressure extraction effect of the negative pressure mechanism 5.

[0077] Therefore, a three-way reversing valve 35 is installed in the negative pressure port and connected to a positive pressure purging air source, such as a high-pressure nitrogen source. When the filter screen 34 becomes clogged, the three-way reversing valve 35 is switched to the position of conducting the positive pressure purging air source. The reverse blowing of the positive pressure purging air source causes the adhering substances on the surface of the filter screen 34 to detach, thereby ensuring the unobstructed flow of the filter screen 34.

[0078] In some embodiments, pulsed airflow is used to periodically clean the filter 34 to reduce residues on its surface.

[0079] In some embodiments, the upper layer of the compounding tank 3 is provided with a number of negative pressure holes, and each negative pressure hole is connected to an independently controllable three-way reversing valve 35.

[0080] like Figure 2 As shown, the negative pressure hole has a strip structure, and the filter screen 34 is a filter screen belt of the corresponding shape;

[0081] Furthermore, the compounding tank 3 is equipped with several negative pressure holes, which are used for positive pressure purging in turn, thereby ensuring that at least one negative pressure hole is always used to connect to the negative pressure mechanism 5 for negative pressure suction, thus ensuring the stability of the negative pressure in the compounding tank 3.

[0082] like Figure 2 As shown, the upper layer of the compounding tank 3 has a number of negative pressure holes arranged in a ring array. The number of negative pressure holes is even and greater than two. During operation, two horizontally opposed negative pressure holes form a group, and the working state of the negative pressure holes is adjusted in groups. That is, at least one group of negative pressure holes is in a negative pressure suction state. Since the negative pressure holes in the negative pressure suction state are horizontally opposed, they can promote the uniform diffusion of powder raw materials to the circumference and prevent the powder raw materials from accumulating on one side.

[0083] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0084] The powder feeding and mixing device provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A powder dosing and blending apparatus, characterized in that include: Powder container (1), used to hold powder raw materials; The compounding tank (3) is connected to the powder tank (1) through the feeding pipe (12). The compounding tank (3) is provided with a negative pressure hole for connecting to a negative pressure mechanism (5) that can maintain the negative pressure of the compounding tank (3). The negative pressure hole is equipped with a filter screen (34) to filter floating objects in the airflow entering the negative pressure mechanism (5).

2. The powder dosing and blending apparatus of claim 1, wherein, It also includes a valve (13) for controlling the flow of fluid in the feed pipe (12); The inlet end of the feed pipe (12) is connected to the powder tank (1), and the outlet end is connected to the compounding tank (3). The vertical height of the inlet end of the feed pipe (12) is higher than that of the outlet end.

3. The powder feeding and mixing device according to claim 2, characterized in that, An on / off control mechanism is provided between the compounding tank (3) and the negative pressure mechanism (5); And / or, the negative pressure mechanism (5) includes a centrifugal fan with controllable operating status.

4. The powder dosing and blending apparatus of claim 1, wherein, The top of the powder tank (1) is connected to a conduit (11) that connects to the compounding tank (3) and / or the feeding pipe (12). Furthermore, an on / off control mechanism is connected in series inside the conductive tube (11).

5. The powder dosing and blending apparatus of claim 1, wherein, It also includes a liquid tank (2) which is connected to the compound tank (3), and a pump body (21) is provided in the passage between the liquid tank (2) and the compound tank (3). The pump body (21) is a metering pump, used to accurately measure the amount of liquid added from the liquid tank (2) to the compounding tank (3).

6. The powder dosing and blending apparatus of claim 5, wherein, The compounding tank (3) is equipped with a nozzle (32) and a powder filling port on the upper part of its interior; the powder filling port is connected to the outlet of the feed pipe (12), and the nozzle (32) is connected to the outlet of the pump body (21); Furthermore, the discharge area of ​​the powder filling port overlaps with the spraying area of ​​the nozzle (32).

7. The powder dosing and blending apparatus of claim 6, wherein, The nozzle (32) is a liquid phase porous nozzle ring, and the liquid phase porous nozzle ring surrounds the powder filling port; A conical cover (31) is provided at the powder filling port to block the spray path of the nozzle (32) directly spraying towards the powder filling port.

8. The powder feeding and mixing device according to claim 6, characterized in that, The lower part of the compounding tank (3) is equipped with a stirring mechanism (4), and the bottom of the compounding tank (3) is equipped with a discharge port (33).

9. A powder dosing and blending apparatus according to any one of claims 1 to 8, wherein, A three-way reversing valve (35) is provided at the negative pressure hole. The three ports of the three-way reversing valve (35) are respectively used to connect the negative pressure hole, the negative pressure mechanism (5) and the positive pressure purging air source, so that the negative pressure hole can be connected to either the negative pressure mechanism (5) or the positive pressure purging air source.

10. The powder feeding and mixing device according to claim 9, characterized in that, The upper layer of the compound tank (3) is provided with a number of negative pressure holes, and each negative pressure hole is connected to a three-way reversing valve (35) that can be controlled independently.

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