CN206925318U - The closed continuous after-treatment system of metal dust - Google Patents

Abstract

The utility model discloses a kind of closed continuous after-treatment system of metal dust, including：Metal dust drying device；Screening plant, it is arranged at below metal dust drying device and is tightly connected by the discharging opening of the first tremie pipe and metal dust drying device；Fine metal powder collecting tank, it is arranged at below the fine powder discharging opening of screening plant and is tightly connected by the fine powder discharging opening of the second tremie pipe and screening plant；Weightlessness claims, and is arranged at below fine metal powder collecting tank and is tightly connected by the discharging opening of the 3rd tremie pipe and fine metal powder collecting tank；Fine powder packing jar, it is arranged at the weightless material inlet for claiming lower section and claiming by the 4th tremie pipe with weightlessness and is tightly connected.For the utility model by the way of gravity feeding, it is more there is losing to solve conventional powder delivery mode, is easily adhered the tube wall the problems such as, in addition, closure and automation by different processes, solve the problems, such as that powder is flown upward, production efficiency is improved, ensures powder properties.

Description

Closed continuous post-processing system for metal powder

technical field

The utility model relates to a closed and continuous post-processing system for alloy powder, in particular to a closed and continuous system in the multi-step production process of automatic screening, transmission, weighing and packaging of metal powder.

Background technique

With the development of the powder metallurgy industry, the requirements for the particle size of the raw metal powder continue to increase. In the metal injection molding process (MIM), the particles of the powder used must be very fine, have a high tap density and a low oxygen content. In addition, in diamond tools, pre-alloyed powders as binders are being developed towards ultra-fine, low-oxygen.

At present, there are many existing industrial pulverization methods, among which the most common and efficient method is water atomization pulverization, which is a process of using water flow to impact the molten metal flow at high speed, thereby breaking the metal flow into fine powder. Because the powder produced by the water atomization method has fine particle size, wide chemical composition, low cost, and is suitable for mass production, the water atomization method is widely used. The water atomization powder making process includes: batching, smelting, atomization, powder dehydration and drying, and post-processing steps such as batching, screening, weighing, and packaging. The powder post-processing process is relatively long.

After the metal powder is prepared and produced, in the post-processing after the powder is dried, at present, in the processes of batching, powder transmission, screening, weighing and packaging, a single process is mainly used to process separately in sequence, for example, after the batching is completed The powder is discharged and moved to the screening area, and the qualified powder after screening is moved into the packaging area for weighing and packaging. These open and discrete processes often have the problem of powder flying, which deteriorates the production environment and brings material loss, mutual pollution and Foreign inclusions risk reducing the quality of the powder product.

The existing technology has made some improvements on the single equipment. For example, the patent application with the publication number CN102172576A discloses on the screening link, and the airtight screening device is used to avoid dust flying and further oxidation in this link; for example, in the packaging link Some manufacturers adopt closed or protective atmosphere system, which can reduce and avoid the problems caused by dust leakage. However, in the whole process of powder production, the degree of automation of powder transmission in each link is still very low. After the powder is dried and before it enters the sieve, the powder must be able to be accurately transferred to the sieve machine. At present, the industry often uses the method of hopper transfer to discharge the dried powder from the dryer to the hopper, and then use a crane or ground cattle to transfer the powder to the hopper. The tool moves the powder hopper to the position of the sieving machine, and feeds manually or by machine. The process involves large amounts of powder coming into contact with open air, causing environmental degradation, material loss and cross-contamination. As the powder enters the equipment and occupies the volume of the equipment, part of the powder is carried out with the exhaust and becomes dust. These problems generally exist in the process of powder transfer, and there is no systematic and effective process to solve these problems.

Contents of the invention

In order to solve the defects of the prior art, the purpose of this utility model is to provide a metal powder closed continuous post-treatment system, which is especially suitable for the post-treatment of ultra-fine water atomized alloy powders. The closed continuous post-treatment system is The metal powder drying, screening, weighing and packaging equipment are combined in the vertical direction through a closed soft connection, which solves the problems of powder flying, powder pollution and environmental pollution caused by the separation and open operation of the metal powder transmission process.

The purpose of this utility model is achieved by the following technical solutions:

A closed continuous post-processing system for metal powder, comprising:

Metal powder drying device for drying metal powder;

A sieving device, arranged below the metal powder drying device and sealedly connected to the discharge port of the metal powder drying device through a first feeding pipe, is used to sieve the metal powder from the metal powder drying device;

The fine metal powder collection tank is arranged below the fine powder discharge port of the sieving device and is sealed and connected with the fine powder discharge port of the sieving device through the second feeding pipe, for receiving the powder from the sieving device. compliant fine metal powder for the device;

A weight loss scale, arranged below the fine metal powder collection tank and sealedly connected with the discharge port of the fine metal powder collection tank through a third feeding pipe, for quantitative delivery of the fine metal powder; and

The fine powder packaging tank is arranged under the loss-in-weight scale and sealedly connected with the feeding port of the loss-in-weight scale through the fourth feeding pipe, and is used to receive a quantitative amount of the fine metal powder to be packaged.

In the above-mentioned metal powder closed continuous post-processing system, as a preferred embodiment, the post-processing system also includes a reweighing and packaging platform, which is arranged behind the fine powder packaging tank, and is used to process the fine powder containing quantitative fine powder. The fine powder packaging cans were weighed and packaged again.

In the above-mentioned metal powder closed continuous post-processing system, as a preferred embodiment, a coarse metal powder collection tank is also provided under the screening device, and the coarse powder outlet of the screening device passes through the fifth lower The feed pipe is sealed and connected with the coarse metal powder collection tank.

In the above metal powder closed continuous post-processing system, as a preferred embodiment, the first feeding pipe, the second feeding pipe, the third feeding pipe, the fourth feeding pipe and At least one of the fifth feeding tubes includes an inner tube and an outer tube sleeved outside the inner tube, wherein the inner tube is a metal tube and the outer tube is a rubber tube. Hose; preferably, the end of the outer tube is provided with a collar, which is used to fix the inner tube and the outer tube, and is also used for the first feeding pipe, the second feeding pipe, The airtight connection between the third feeding pipe, the fourth feeding pipe or the fifth feeding pipe and adjacent devices.

In the above-mentioned closed continuous post-processing system for metal powder, as a preferred embodiment, the fine powder packaging tank is set on the powder loading platform, so as to transport the packaging tank filled with fine powder to the reweighing and packaging platform.

In the above-mentioned metal powder closed continuous post-processing system, as a preferred embodiment, the metal powder drying device is a movable device, and the end of the first feeding pipe connected to the metal powder drying device is provided with an automatic The docking device is used for automatic docking between the first feeding pipe and the metal powder drying device.

In the above-mentioned metal powder closed continuous post-processing system, as a preferred embodiment, a turntable feeder is arranged between the first feeding pipe and the screening device for feeding the screening device ; Preferably, the outlet of the turntable feeder is in sealing connection with the inlet of the screening device.

In the above-mentioned metal powder closed continuous post-processing system, as a preferred embodiment, the post-processing system further includes a first air flow balance pipe, the two ends of which are respectively connected to the turntable feeder and the fine metal powder collection tank, Used to balance the gas pressure between the turntable feeder and the fine metal powder collection tank.

In the above-mentioned metal powder closed continuous post-processing system, as a preferred embodiment, the post-processing system also includes a second air flow balance pipe, the two ends of which are respectively connected to the measuring tank of the loss-in-weight scale and the fourth feeding pipe. Connected, used to balance the gas pressure between the weighing tank of the weight loss scale and the fine powder packaging tank.

In the above-mentioned closed and continuous post-processing system for metal powder, as a preferred embodiment, the discharge port of the fine metal powder collection tank is provided with a discharge valve for controlling the discharge amount of the fine powder.

Compared with the prior art, the utility model has the following beneficial effects:

1) The utility model realizes the airtightness of the post-processing system through the airtight soft connection between different process equipment.

2) The utility model rationally arranges the relative spatial positions of different process equipments, so that the post-processing devices can be effectively connected, and the automatic continuity of the post-processing system is realized.

3) The utility model uses an automatic docking device and a turntable feeder so that the materials in the drying device can be directly and automatically quantitatively transported to the screening machine without being placed in other containers.

4) The utility model adopts the method of gravity feeding, which solves the problems that the conventional powder transmission method has many losses and is easy to adhere to the pipe wall; the utility model combines the drying device, the rotary feeder, the screening machine and the weighing equipment Arranged in the vertical direction, it is easy to realize the transmission of powder and reduce energy consumption.

5) By realizing the closed connection and automatic connection of the whole process, the utility model reduces labor intensity, improves the environment, avoids the entry of foreign inclusions, solves the problem of powder flying caused by separation and open operation, improves production efficiency, optimizes the environment and Thoroughly prevent foreign matter from entering the powder and ensure the quality of the powder.

Description of drawings

Figure 1 is a schematic diagram of a closed continuous post-treatment system for metal powder.

Among them, 1-dryer; 2-automatic docking device; 3-first feeding pipe; 4-turntable feeder; 5-screening machine; 6-coarse powder feeding pipe or fifth feeding pipe; Metal powder collection tank; 8-fine metal powder collection tank; 9-fine powder feeding pipe or second feeding pipe; 10-first air flow balance pipe, second air flow balance pipe; 11-weight loss weighing tank; 12 -Screw feeding feeding tube or the fourth feeding tube; 13 fine powder packaging tank; 14-powder loading platform; 15-reweighing and packaging platform; 16-third feeding tube; 17-weight loss weighing platform; 18 -Screw feeding mechanism

detailed description

Figure 1 shows a schematic diagram of a closed continuous post-processing system for metal powder, which realizes direct screening of powder in a drying device, and realizes closed screening and closed automatic weighing and packaging production. The post-processing system of the utility model is especially suitable for processing ultra-fine water atomized alloy powder. Referring to Fig. 1, the metal powder airtight and continuous post-processing system of the present utility model includes: metal powder drying device, screening device, The fine metal powder collection tank 8, the coarse metal powder collection tank 7, the weight loss scale, and the fine powder packaging tank 13 all realize sealed connections between these devices, that is, the direct contact between the metal powder and the air will not occur in the whole system. In this post-processing system, the screening device is arranged below the metal powder drying device and is sealed and connected with the discharge port of the metal powder drying device through the first feeding pipe 3; the fine metal powder collection tank 8 is arranged at the bottom of the screening device Below the fine powder outlet and through the second feeding pipe 9 and the fine powder outlet of the sieving device are sealed and connected; the weight loss scale is arranged below the fine metal powder collection tank 8 and connected to the fine metal powder through the third feeding pipe 16. The discharge port of the powder collection tank 8 is sealed and connected; the fine powder packaging tank 13 is arranged below the weight loss scale and is sealed and connected with the feed port of the weight loss scale through the fourth feeding pipe 12 . These devices are all arranged in the vertical direction, therefore, the feeding method is guaranteed to be gravity feeding, and the above-mentioned sealed connection can be connected through a soft airtight pipeline. The equipment in the post-processing system of the present invention will be described in detail one by one below.

The metal powder drying device is used to dry the metal powder after batching or unbatching. The metal powder drying device can be a drying machine commonly used in the art, as shown in Figure 1. The drying machine 1 is provided with a discharge port at the bottom to The dried material in the dryer 1 is discharged. The drier 1 can be a movable device or a replaceable device, that is, after the metal powder in one drier is discharged, the drier is replaced for discharging, so that the post-treatment process can be continuously carried out.

The sieving device is arranged under the metal powder drying device and is sealed and connected with the discharge port of the dryer 1 through the first feeding pipe 3, and is used to sieve the metal powder from the dryer 1 to classify it according to requirements. The separation device can be a commonly used sieving machine in the art, such as the sieving machine 5 shown in Figure 1, which can sieve the dried metal powder into fine metal powder that meets the requirements and coarse metal powder that does not meet the requirements. The fine metal powders that meet the requirements continue to be processed, such as weighing and packaging, while the coarse metal powders that do not meet the requirements are recycled and used as raw materials for the preparation of alloy powders by water atomization. The screening machine 5 is provided with a feed inlet at the upper end for receiving dry metal powder, and with a fine powder outlet and a coarse powder outlet at the lower end for discharging the classified metal powder respectively. The drying machine 1 of the utility model is sealed and connected with the screening machine 5 through the first feeding pipe 3, specifically, the first feeding pipe 3 is a hose, so as to facilitate the sealing connection. However, in order to reduce non-metallic inclusions and avoid wear of the metal powder on the pipeline, the first feeding pipe preferably includes an inner pipe and an outer pipe sleeved outside the inner pipe, wherein: the inner pipe is a metal pipe , the outer tube is a rubber hose; the two ends of the outer tube are more preferably provided with pipe collars, which are used to fix the inner tube and the outer tube on the one hand, and on the other hand to facilitate the drying of the first feeding tube and the adjacent device. Airtight connection between machine 1 and screening machine 5.

Since the dryer 1 is a movable device, the problem of the docking of the dryer 1 and the first feeding pipe 3 will occur every time the dryer is replaced, which is also a problem affecting production efficiency. One end of the feed pipe 3 , that is, the end connected to the dryer 1 (ie, the upper end), is provided with an automatic docking device 2 to realize the automatic docking of the first feeding pipe 3 and the dryer 1 . The automatic docking device 2 can be a conventional automatic docking device. In the present invention, the automatic docking device 2 preferably realizes automatic docking through a cylinder.

In order to better control the amount of material entering the screening machine in the dryer 1, a feeding device for controlling feeding is provided at the lower end of the first feeding pipe 3 or the end connected to the screening machine 5 on the first feeding pipe 3 , such as a feed valve (such as a star unloader), a feeder (such as a turntable feeder), etc., in a preferred embodiment of the present utility model, one end connected to the screening machine 5 on the first feed pipe 3 A rotary table feeder 4 is provided for feeding the screening machine 5, that is, a rotary table feeder 4 is arranged between the first feeding pipe 3 and the screening machine 5; preferably, the discharge port of the rotary table feeder 4 It is sealingly connected with the feeding port of the screening machine 5, and the outlet of the first feeding pipe 3 is sealingly connected with the feeding port of the turntable feeder 4, that is to say, it can also be passed through the pipeline with the same structure as the first feeding pipe Link them sealed. The turntable feeder 4 has no other air inlets except the feed inlet and the discharge outlet, and is a sealed device.

The fine metal powder collection tank 8 is arranged below the fine powder discharge port of the sieving machine 5, and is used to receive the qualified fine metal powder obtained after the sieving machine 5 sieves. Outside the discharge port, there is no other air inlet, the fine powder discharge port fine powder feeding pipe (second feeding pipe) 9 of the sieving machine 5 is sealed with the fine metal powder collection tank 8, preferably, the second feeding The structure of the tube is the same as that of the first feeding tube. Since the turntable feeder 4 and the fine metal powder collection tank 8 are all sealed and connected, and there is no other air inlet in the equipment, there may be uneven pressure between each equipment. In order to ensure the smooth and continuous operation of post-processing , in the embodiment of the present utility model, between the turntable feeder 4 and the fine metal powder collection tank 8, the first air flow balance pipe 10 is set, that is, the two ends of the first air flow balance pipe 10 are connected with the turntable feeder 4 respectively. It is connected with the fine metal powder collection tank 8 to ensure the balance of gas pressure inside the equipment. In order to control the discharge capacity of the fine metal powder collection tank 8, the utility model is provided with a blanking device (not shown in the figure) at the outlet of the fine metal powder collection tank 8, such as a feed valve (such as a star discharge feeder), feeder (such as turntable feeder, screw feeder), etc., preferably, the outlet of the fine metal powder collection tank 8 is provided with a star discharger for controlling the amount of fine powder .

The bottom of the sieving machine 5 is also provided with a coarse metal powder collection tank 7, and the coarse powder outlet of the sieving machine 5 is sealed connected with the coarse metal powder collection tank 7 through the fifth feeding pipe 6 (coarse powder feeding pipe). The structure of the fifth feeding pipe 6 is the same as that of the first feeding pipe. In order to control the output of the coarse metal powder collection tank 7, the utility model is also provided with a blanking device (not shown in the figure) at the discharge port of the coarse metal powder collection tank 7, such as a feed valve (such as a star discharge valve) feeder), feeder (such as turntable feeder, screw feeder), etc., preferably, the discharge port of the coarse metal powder collection tank 7 is provided with a star discharger for controlling the discharge of coarse powder quantity.

The weight loss scale is arranged below the fine metal powder collection tank 8 and is sealed and connected with the discharge port of the fine metal powder collection tank 8 through the third feeding pipe 16, and is used to quantitatively transport the fine powder in the fine metal powder collection tank 8 to In the fine powder packaging tank 13, specifically, the inlet of the weight loss weighing tank 11 and the discharge port of the fine metal powder collection tank 8 are sealed and connected by the third feeding pipe 16; the structure of the third feeding pipe 16 is the same as that of the first feeding pipe. The structure of the feeding pipe is the same. The loss-in-weight scale is mainly composed of a weighing platform 17, a measuring tank 11 set on the weighing platform 17, a screw feeding mechanism 18 connected to the outlet of the measuring tank 11, and a weighing control system. The weighing control system is connected with the fine metal The star unloader provided at the discharge port of the powder collection tank 8, the motor of the screw feeding mechanism 18, the load cell, and the weighing controller are connected to unload the star according to the set feed level and replenishment level. The feeder is regulated, and the motor of the screw feeding mechanism 18 is regulated to control the loss-in-weight weighing discharge speed according to the calculation result of the weighing controller. The working steps of the loss-in-weight scale are: a. First, the fine metal powder collection tank 8 discharges the material to the material tank 11. When the weighing control system detects that the material has been added to the set position, the feeding process is automatically stopped; b. After the feeding is completed , the weightless scale starts to run. During the running process of the weightless scale, the load cell collects the flow data in real time and sends them to the weighing controller for processing. After calculation, the real-time processed data is sent to the touch screen on the one hand for display on the screen. And data communication, control the rotating speed of motor on the other hand, to reach the purpose of real-time adjustment flow rate; When the set feeding range is reached, the weighing control system controls the fine metal powder collection tank 8 to start feeding, and at the same time, the loss-in-weight scale operates in an accurate volume mode to ensure stable and accurate flow.

Fine powder packaging tank 13 is arranged below the discharge port of loss-in-weight weighing screw feeding mechanism 18 and is sealed and connected with the discharge port of loss-in-weight weighing screw feeding mechanism 18 through the fourth feeding pipe 12, and is used to receive all the products to be packaged. The above fine metal powder. The structure of the fourth feeding pipe 12 is the same as that of the first feeding pipe. The fine powder packaging tank 13 is arranged on the powder loading platform 14, so that the packaging tank filled with fine powder is transported to the reweighing and packaging platform described below, that is, the next process reweighing and packaging. The fine powder packaging tank 13 has no other air inlet except for the feed inlet, which is airtight. Since the weighing tank of the self-weight loss scale is connected to the fine powder packaging tank 13 in a sealed connection, in order to balance the pressure between the various devices, The utility model is provided with the second air flow balance pipe 10 between the weighing tank 11 of the weight loss scale and the fourth feeding pipe 12, which is used to balance the gas pressure between the weighing tank 11 of the weight loss scale and the fine powder packaging tank 13, Ensure the balance of gas pressure inside the equipment. The powder loading platform 14 is usually a roller platform, so as to move to the reweighing and packaging position in time after the packaging bucket receives the powder.

This post-processing system also includes reweighing and packing platform 15, is arranged on the rear of described fine powder packaging tank, promptly is arranged on the rear of powder loading platform 14, is used for again weighing the fine powder packaging tank 13 that quantitative fine powder is housed. Heavy and packed.

The usage method of the post-processing system of the present utility model is as follows:

Docking: Move the dryer with dried metal powder directly above the automatic docking device, and dock the outlet of the dryer with the automatic docking device;

Screening: Open the feeding valve at the lower end of the first feeding pipe, so that the dry metal powder enters the sieving machine through the first feeding pipe. After screening, the fine powder and coarse powder are separated, and the fine powder enters the fine metal powder on the left side for collection. tank, the coarse powder enters the right coarse metal powder collection tank.

Weighing: The fine powder in the fine metal powder collection tank on the left enters the loss-in-weight scale through the discharge valve at the outlet of the fine metal powder collection tank for weighing, and the fine powder enters the fine powder packaging tank through the feeding mechanism of the loss-in-weight scale.

Secondary detection means reweighing: the fine powder packaging can enters the secondary detection position through the powder loading platform, that is, the sliding platform, that is reweighing position.

Packing: The fine powder packaging cans that meet the requirements enter the packaging station.

The above-mentioned post-processing system can ensure the continuous process of post-processing. The alloy powder is classified, weighed and packaged. With the post-processing method, the powder loss rate is reduced by ten times, and the production efficiency is increased by 50%.

Since the post-processing system of the utility model is all operated in a closed system, the entry of oxygen and water vapor is avoided, and the amount of oxygen added to the powder is less than 100ppm, which also prevents external dust from entering the system to pollute the alloy powder being processed, and also avoids Powder fly loss and pollute the environment.

The above description and accompanying drawings are not intended to limit the utility model, and changes and modifications made by those skilled in the art according to the utility model all fall within the protection scope of the utility model.

Claims (10)

1. A closed continuous aftertreatment system for metal powder, characterized in that the aftertreatment system comprises: Metal powder drying device for drying metal powder; A sieving device, arranged below the metal powder drying device and sealedly connected to the discharge port of the metal powder drying device through a first feeding pipe, is used to sieve the metal powder from the metal powder drying device; The fine metal powder collection tank is arranged below the fine powder discharge port of the sieving device and is sealed and connected with the fine powder discharge port of the sieving device through the second feeding pipe, for receiving the powder from the sieving device. compliant fine metal powder for the device; A weight loss scale, arranged below the fine metal powder collection tank and sealedly connected with the discharge port of the fine metal powder collection tank through a third feeding pipe, for quantitative delivery of the fine metal powder; and The fine powder packaging tank is arranged under the loss-in-weight scale and sealedly connected with the feeding port of the loss-in-weight scale through the fourth feeding pipe, and is used to receive a quantitative amount of the fine metal powder to be packaged. 2. The metal powder airtight continuous post-processing system according to claim 1, characterized in that, the post-processing system also includes a reweighing and packaging platform, which is arranged at the rear of the fine powder packaging tank for quantitative The fine powder cans of fine powder were weighed and packaged again. 3. The metal powder closed continuous aftertreatment system according to claim 2, characterized in that, a coarse metal powder collection tank is also provided below the screening device, and the coarse powder outlet of the screening device passes through The fifth feeding pipe is airtightly connected with the coarse metal powder collection tank. 4. The metal powder closed continuous post-processing system according to claim 3, characterized in that, the first feeding pipe, the second feeding pipe, the third feeding pipe, the fourth feeding pipe At least one of the feed pipe and the fifth feed pipe includes an inner pipe and an outer pipe sleeved outside the inner pipe, wherein the inner pipe is a metal pipe, and the outer pipe The tube is a rubber hose. 5. The metal powder airtight and continuous post-processing system according to claim 2, characterized in that, the fine powder packaging tank is arranged on the powder loading platform, so as to transport the packaging tank filled with fine powder to reweighing and packaging platform. 6. The metal powder closed and continuous post-processing system according to claim 1, wherein the metal powder drying device is a movable device, and the end of the first feeding pipe connected to the metal powder drying device is An automatic docking device is provided for automatic docking of the first feeding pipe and the metal powder drying device. 7. The metal powder airtight continuous post-processing system according to claim 1, characterized in that, a turntable feeder is provided between the first feeding pipe and the screening device for feeding to the screening device. Device feeding. 8. The metal powder airtight continuous post-processing system according to claim 7, characterized in that, the post-processing system further comprises a first air flow balance pipe, two ends of which are respectively connected to the turntable feeder and the fine metal powder collection A tank is connected to balance the gas pressure between the turntable feeder and the fine metal powder collection tank. 9. The metal powder airtight continuous post-processing system according to claim 1, characterized in that, the post-processing system also includes a second air flow balance pipe, the two ends of which are respectively connected to the measuring tank of the loss-in-weight scale and the fourth The feed pipe is connected to balance the gas pressure between the weighing tank of the weight loss scale and the fine powder packaging tank. 10. The metal powder closed continuous post-processing system according to claim 1, characterized in that, the discharge port of the fine metal powder collection tank is provided with a discharge valve for controlling the discharge amount of the fine powder.