Collecting method for flammable and explosive metal dust

Abstract

The invention relates to the technical field of additive manufacturing, and discloses a method for collecting flammable and explosive metal dust, which is used in an additive manufacturing process, and comprises the following steps: sucking out the metal dust from a trap by utilizing negative pressure generated by a negative pressure generator, and directly mixing the sucked-out metal dust with circulating liquid, and the sucked-out metal dust is continuously conveyed into a receiving barrel by means of circulating liquid. The invention provides a process and a device for completely isolating air and fully automatically collecting flammable and explosive metal dust, and the process and the device are simple in process flow, safe, reliable and low in one-time cost and maintenance cost.

Description

Technical Field

[0001] The invention relates to the technical field of additive manufacturing, and in particular to a method for collecting flammable and explosive metal dust. Background Art

[0002] With the continuous breakthrough of key technologies, the additive manufacturing industry is developing rapidly. Additive manufacturing is based on digital model files, using powdered metal or plastic and other bondable materials to construct objects by printing layer by layer.

[0003] Currently, in the battery field, most metal dusts used are flammable and explosive, and dust collection and treatment is a major problem. The industry usually uses inert gas to transport and collect through collectors, but there is still a risk of explosion. For example, when the commonly used collector is full of dust, it is necessary to manually replace the dust filter bag / filter cartridge to deal with the enriched dust. Even if it is completed quickly in an inert gas environment, there is still a possibility of contact with air at the moment of replacement, and explosion accidents become probabilistic events. Summary of the invention

[0004] The present invention provides a method and a device for collecting flammable and explosive metal dust, and provides a process and a device for fully isolating from air and fully automatically collecting flammable and explosive metal dust. The process flow is simple, safe and reliable, and the one-time cost and maintenance cost are low. The invention aims to solve the technical problems in the prior art that the enriched dust may still be exposed to the air at the moment of replacing the dust filter bag / filter cartridge and the like, and there is still the risk of combustion and explosion.

[0005] The present invention can be achieved through the following technical solutions:

[0006] A method for collecting flammable and explosive metal dust is used in an additive manufacturing process. The negative pressure generated by a negative pressure generator is used to suck the metal dust out of a collector, the sucked metal dust is directly mixed with a circulating liquid, and the sucked metal dust is continuously transported to a receiving barrel with the help of the circulating liquid.

[0007] Furthermore, the negative pressure generator is connected to the collector. When the metal dust inside the collector reaches an overflow warning line, the negative pressure generator is controlled to operate to generate negative pressure to suck the metal dust out of the collector.

[0008] Furthermore, with the help of the circulating flow of the circulating liquid, the metal dust mixed in it is continuously transported to the receiving barrel, and after being filtered by the receiving barrel, the circulating liquid is on top and the metal dust is on the bottom, and only the circulating liquid can flow out of the receiving barrel directly into the circulating flow.

[0009] Furthermore, a filter is provided inside the receiving barrel, the inlet for the circulating liquid to enter the receiving barrel is provided below the filter, and the outlet for the circulating liquid to flow out of the receiving barrel is provided above the filter, and the filter only allows the circulating liquid to pass through.

[0010] Furthermore, the filter screen is arranged at an angle, and the circulating liquid entering the receiving barrel through the inlet is directly injected onto the filter screen.

[0011] Furthermore, the circulating liquid is arranged in a pipeline loop, and the receiving tank and the negative pressure generator are both connected and arranged in the pipeline loop.

[0012] Furthermore, the circulating liquid has a density less than that of the metal dust and does not chemically react with the metal dust.

[0013] Furthermore, the circulating liquid is liquid water.

[0014] The beneficial technical effects of the present invention are:

[0015] 1. By transporting metal dust with circulating liquid, it can be completely sealed in the liquid. At the same time, the metal dust can be sucked out of the collector by negative pressure, which can also avoid the possibility of metal dust contacting the air. Therefore, the entire collection process can be completely isolated from the air, which can greatly reduce the possibility of combustion and explosion accidents. It is safe and reliable. At the same time, the process is simple, easy to control, and highly practical.

[0016] 2. An inclined filter is set inside the receiver to directly project the mixed liquid entering the receiver onto the filter. Since the density of the circulating liquid is lower than that of the metal dust and the mesh size of the filter is smaller than the volume of the metal dust, only the circulating liquid can pass through, thereby ensuring that there is always circulating liquid above the filter. Driven by the driver, there is always circulating liquid that can enter the circulation flow to ensure the sustainability of the flow. At the same time, the metal dust can always be immersed in the circulating liquid, providing a guarantee for reducing the occurrence of combustion and explosion accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall process of the collection method of the present invention;

[0018] Figure 2 It is a schematic diagram of the overall structure of the collecting device corresponding to the collecting method of the present invention. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0020] like Figure 1As shown, the present invention provides a method for collecting flammable and explosive metal dust, which uses the negative pressure generated by the negative pressure generator to suck the metal dust out of the collector, directly mixes the sucked metal dust with the circulating liquid, and continuously transports the sucked metal dust to the receiving barrel with the help of the circulating liquid. The metal dust can be completely sealed in the liquid by transporting the circulating liquid, and the metal dust can be sucked out of the collector by the negative pressure, which can also avoid the possibility of the metal dust contacting the air, so that the entire collection process can be completely isolated from the air, which can greatly reduce the possibility of explosion accidents, is safe and reliable, and has a simple process flow, convenient control, and strong practicality.

[0021] The details are as follows:

[0022] Step 1: Start the circulation of circulating liquid

[0023] Start the drive, which drives the circulating liquid to flow continuously to form a cycle in preparation for transporting the sucked metal dust.

[0024] In order to avoid contact with air, we can set the circulating liquid in the pipeline loop, and the circulating flow of the circulating liquid can be driven by a driver. The driver can use a pneumatic diaphragm pump. At the same time, the receiving tank and the negative pressure generator are connected and set in the pipeline loop. In this way, the whole process is carried out in the pipeline, and the sucked metal dust can be directly transported to the circulating liquid to minimize contact with air.

[0025] Step 2: Use negative pressure to suck out metal dust from inside the collector

[0026] The negative pressure generator needs to be connected to the collector. When the metal dust inside the collector reaches the overflow warning line, the negative pressure generator is controlled to work to generate negative pressure, sucking the metal dust out of the collector and mixing the sucked metal dust directly with the circulating liquid to avoid contact with the air.

[0027] At this time, the flowing circulating liquid enters the negative pressure generator and mixes with the metal dust. Driven by the driver, the metal dust mixed in it is continuously transported to the receiving barrel, and after being filtered by the receiving barrel, only the circulating liquid is transported out of the receiving barrel to continue flowing.

[0028] The negative pressure generator can use a venturi tube, the inlet of its adsorption chamber is connected to the collector, and its fluid inlet and fluid outlet are connected in the pipeline loop. In this way, when the negative pressure generator is started, the sucked metal dust will be directly mixed into the circulating liquid. Driven by the driver, the circulating liquid mixed with metal dust will be transported to the contact barrel. After being filtered by the receiving barrel, only the circulating liquid is transported out of the receiving barrel and continues to flow. To this end, we can set the density of the circulating liquid to be less than the density of the metal dust. Liquid water such as household tap water can be used, and it does not react chemically with the metal dust. A filter is set inside the receiving barrel, and the inlet for the circulating liquid to enter the receiving barrel is set below the filter, and the outlet for the circulating liquid to flow out of the receiving barrel is set above the filter. The mesh size of the filter is selected according to the particle size of the metal dust, so that only the circulating liquid can pass through.

[0029] In this way, the mixed metal dust and circulating liquid are filtered and separated in the receiving barrel by using the filter screen, so that the circulating liquid is on top and the metal dust is on the bottom, so that the circulating liquid in the receiving barrel can directly enter the circulation flow.

[0030] In order to ensure that there is circulating liquid inside the receiving barrel to circulate at the beginning, we can set the filter screen at an angle. The circulating liquid entering the receiving barrel through the inlet needs to be directly projected onto the filter screen, so that the metal dust will attach to the filter screen and then fall due to gravity and accumulate at the bottom of the receiving barrel, while the circulating liquid directly passes through the filter screen and is stored above the filter screen. A layer of circulating liquid on the top and metal dust on the bottom is formed in the receiving barrel, which achieves the effect of isolating the metal dust from the air, facilitates the storage of metal dust, and also ensures that the circulating liquid can continue to flow.

[0031] Step 3: Metal dust treatment inside the receiving barrel

[0032] When the metal dust inside the receiving barrel reaches the warning line, it is still necessary to deal with the metal dust inside it. However, since the metal dust inside the receiving barrel is immersed in the circulating liquid, it can be completely isolated from the air, thus reducing the risk of combustion and explosion. We can replace the receiving barrel as a whole, or use liquid transportation to deal with the metal dust in the barrel.

[0033] like Figure 2 As shown, the present invention also provides a collection device based on the above-mentioned method for collecting inflammable and explosive metal dust, comprising a pipeline loop, a negative pressure generator, a driver, and a receiving barrel are connected and arranged on the pipeline loop, and a circulating liquid is arranged inside the negative pressure generator, which is connected to a collector, and the collector is used to collect metal dust. The negative pressure generator is used to generate negative pressure to suck the metal dust out of the collector and directly mix the sucked metal dust with the circulating liquid. The receiving barrel is used to receive the mixed metal dust and filter it.

[0034] The driver is used to drive the circulating liquid to flow continuously in the pipeline loop, so as to continuously transport the mixed metal dust to the receiving barrel and continuously transport the circulating liquid out of the receiving barrel.

[0035] For the convenience of control, a one-way valve is arranged at the inlet pipe position of the receiving barrel, and a first pneumatic butterfly valve is arranged at the outlet pipe position; the negative pressure generator can be arranged as a Venturi tube, and a second pneumatic butterfly valve is arranged on the pipe between the negative pressure generator and the collector.

[0036] In this way, when the metal dust inside the collector reaches the overflow warning line, the driver such as the pneumatic diaphragm pump is controlled to work first, and the driver provides power to open the first pneumatic butterfly valve and the one-way valve, and the circulating liquid is transported to the venturi tube, thereby prompting the circulating liquid to flow in the pipeline loop, and then the negative pressure generator is controlled to work, and the second pneumatic butterfly valve is opened. The negative pressure generated by the special structure inside the venturi tube sucks the metal dust out of the collector, and the metal dust is transported into the receiving barrel together with the circulating liquid. A filter is arranged in the receiving barrel. After the mixed metal dust is directly shot onto the filter, it falls to the bottom of the barrel due to gravity and is enriched, and the mesh can only allow pure circulating liquid to pass through, so upper and lower layers are formed in the barrel. The circulating liquid in the upper layer is pumped out by the diaphragm pump for continuous circulation, and the metal dust in the lower layer is immersed in the circulating liquid, so as to achieve the effect of isolating the metal dust from the air, which is convenient for the storage of the metal dust. During the whole process, the metal dust is isolated by the circulating liquid, and the possibility of combustion and explosion is minimized.

[0037] In addition, a one-way valve is provided at the inlet of the receiving barrel to prevent the circulating liquid from flowing back when the liquid level in the barrel is high.

[0038] Although specific embodiments of the present invention are described above, those skilled in the art should understand that these are merely examples and that various changes or modifications may be made to these embodiments without departing from the principles and essence of the present invention. Therefore, the scope of protection of the present invention is limited by the appended claims.

Claims

1. A method for collecting inflammable and explosive metal dust, characterized in that: Used in the additive manufacturing process, the negative pressure generated by the negative pressure generator is used to suck the metal dust out of the collector, the sucked metal dust is directly mixed with the circulating liquid, and the sucked metal dust is continuously transported to the receiving barrel with the help of the circulating liquid.

2. The method for collecting inflammable and explosive metal dust according to claim 1, characterized in that: The negative pressure generator is connected to the collector. When the metal dust inside the collector reaches the overflow warning line, the negative pressure generator is controlled to work to generate negative pressure to suck the metal dust out of the collector.

3. The method for collecting inflammable and explosive metal dust according to claim 2, characterized in that: With the help of the circulating flow of the circulating liquid, the metal dust mixed in it is continuously transported to the receiving barrel. After being filtered by the receiving barrel, the circulating liquid is on top and the metal dust is on the bottom, and only the circulating liquid can flow out of the receiving barrel directly into the circulating flow.

4. The method for collecting inflammable and explosive metal dust according to claim 3, characterized in that: A filter screen is arranged inside the receiving barrel, the inlet for the circulating liquid to enter the receiving barrel is arranged below the filter screen, and the outlet for the circulating liquid to flow out of the receiving barrel is arranged above the filter screen, and the filter screen only allows the circulating liquid to pass through.

5. The method for collecting inflammable and explosive metal dust according to claim 4, characterized in that: The filter screen is arranged obliquely, and the circulating liquid entering the receiving barrel through the inlet is directly injected onto the filter screen.

6. The method for collecting inflammable and explosive metal dust according to claim 3, characterized in that: The circulating liquid is arranged in a pipeline loop, and the receiving tank and the negative pressure generator are both connected and arranged in the pipeline loop.

7. The method for collecting inflammable and explosive metal dust according to claim 1, characterized in that: The circulating liquid has a density lower than that of the metal dust and does not chemically react with the metal dust.

8. The method for collecting inflammable and explosive metal dust according to claim 7, characterized in that: The circulating liquid is liquid water.

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