Powder collecting device

Abstract

The utility model relates to the field of sampling equipment, and provides a powder collecting device which comprises a feeding pipe, a vacuumizing mechanism, a sealing bin and a collecting bin, the feeding pipe is communicated with the interior of the sealing bin, and the vacuumizing mechanism is connected with the sealing bin; a feeding valve is installed on the feeding pipe, and a vacuum switch valve is installed on a connecting pipeline of the sealing bin and the vacuumizing mechanism. The sealing bin is provided with an emptying valve, and the bottom of the sealing bin is provided with a discharge port; the collecting bin is located below the discharging port and provided with a feeding port, and a discharging valve is installed on a communicating pipeline of the discharging port and the feeding port. The powder is sucked into the sealing bin from the feeding pipe under the action of the vacuumizing mechanism and then falls into the collecting bin from the sealing bin, the whole powder obtaining process is carried out in a closed environment, the powder cannot be scattered in the air, pollution to the air is avoided, and potential safety hazards are eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of sampling equipment, in particular to a powder collecting device. Background Art

[0002] During the production process, it is usually necessary to sample and analyze powders such as flour, milk powder or soy milk powder to ensure that the production performance of the powder products meets the requirements. Sampling and analysis can be done by directly collecting powders on the production line for analysis, or by directly sampling from the finished product with the help of tools such as sampling shovels. At present, hand-held tools are mostly used for taking and collecting powders. Impurities carried by hand-held tools can easily contaminate the powders. If the user's hand accidentally touches the powder, it may also cause injury to the hand. In the process of transferring powder, the powder is easy to spill, and dust may occur, causing air pollution. If the powder is flammable, the dust dispersed in the air can easily cause fire safety accidents. Summary of the invention

[0003] The utility model provides a powder collecting device, which is used to solve the problem in the prior art that when collecting powder by hand-held tools, powder is easily spilled to cause dust and air pollution.

[0004] The utility model provides a powder collecting device, comprising: a feed pipe, a vacuum pumping mechanism, a sealing bin and a collecting bin, wherein the feed pipe is connected to the inside of the sealing bin, the vacuum pumping mechanism is connected to the sealing bin, wherein a feed valve is installed on the feed pipe, and a vacuum switch valve is installed on the connecting pipeline between the sealing bin and the vacuum pumping mechanism;

[0005] The sealed bin is equipped with a vent valve, a discharge port is provided at the bottom of the sealed bin, the collecting bin is located below the discharge port, the collecting bin has a feed port, and a discharge valve is installed on the connecting pipeline between the discharge port and the feed port.

[0006] According to a powder collecting device provided by the utility model, the sealed chamber includes a sample feeding chamber and a vacuum chamber, the vacuum pumping mechanism is connected to the vacuum chamber, and the vent valve is installed on the vacuum chamber; the sample feeding chamber and the vacuum chamber are connected through a connecting pipe, and a control valve is installed on the connecting pipe;

[0007] The feed pipe is connected to the interior of the sample feeding chamber, and the discharge port is arranged at the bottom of the sample feeding chamber.

[0008] According to a powder collecting device provided by the utility model, the bottom of the sample feeding bin is tapered, and the discharge port is located at the small-diameter end of the sample feeding bin.

[0009] According to a powder collecting device provided by the utility model, a discharge valve is provided at the bottom of the collecting bin.

[0010] A powder collection device provided by the present utility model, wherein the collection bin is transparent, and a scale line is provided on the outer wall of the collection bin.

[0011] A powder collection device provided by the present utility model, wherein the end of the feed pipe is pointed.

[0012] A powder collection device provided by the present utility model further includes a box body, the box body has a box door that can be opened, the inlet end of the feed pipe extends outside the box body, the outlet end of the feed pipe is located inside the box body and communicates with the sealed bin, and the sealed bin and the vacuum pumping mechanism are both arranged inside the box body.

[0013] A powder collection device provided by the present utility model, wherein a traveling mechanism is installed at the bottom of the box body.

[0014] A powder collection device provided by the present utility model further includes a controller, the vacuum pumping mechanism includes a vacuum pump and a filter, the vacuum pump is connected to the inside of the sealed bin through a vacuum pipe, the vacuum switch valve and the filter are respectively installed on the vacuum pipe, and the vacuum pump and the vacuum switch valve are respectively electrically connected to the controller.

[0015] A powder collection device provided by the present utility model, wherein a vacuum pressure gauge is installed on the vacuum pipe, the vacuum pressure gauge is located on the side of the vacuum switch valve close to the sealed bin, and the vacuum pressure gauge and the vacuum regulating valve are respectively electrically connected to the controller.

[0016] The present utility model provides a powder collection device. The vacuum pumping mechanism is connected to the sealed bin and is used to evacuate the inside of the sealed bin. After the feed pipe is inserted into the material container, the powder enters the sealed bin from the material container along the feed pipe, realizing the preliminary collection of the powder. After adjusting the air pressure in the sealed bin through the vent valve, the powder can fall from the discharge port into the collection bin. The entire powder acquisition process is carried out in a closed environment, and the powder will not spill into the air, avoiding air pollution and eliminating potential safety hazards. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is the overall structural schematic diagram of the powder collection device provided by the present utility model.

[0019] Reference numerals:

[0020] 1. Feed pipe; 2. Vacuum extraction mechanism; 3. Sealing chamber; 31. Sample feeding chamber; 32. Vacuum chamber; 4. Collection chamber; 5. Connecting pipe; 6. Feed valve; 7. Discharge valve; 8. Discharge valve; 9. Controller; 10. Compartment; 20. Travel mechanism; 21. Vacuum pump; 22. Vacuum tube; 23. Vacuum switch valve; 24. Vacuum pressure gauge; 25. Vacuum regulating valve; 26. Filter; 311. Discharge port; 321. Vent valve; 51. Control valve; 101. Compartment door. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] The term "first" or "second" in the specification and claims of the utility model may explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, "multiple" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the related objects are in an "or" relationship.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] The following will combine Figure 1 with specific embodiments and their application scenarios to describe in detail a powder collection device provided by an embodiment of the present utility model.

[0026] As Figure 1 shown, the present utility model provides a powder collection device, including: a feed pipe 1, a vacuum pumping mechanism 2, a sealed chamber 3, and a collection chamber 4. The interior of the feed pipe 1 and the sealed chamber 3 is in communication. The vacuum pumping mechanism 2 is connected to the sealed chamber 3 to adjust the internal air pressure of the sealed chamber 3. Among them, a feed valve 6 is installed on the feed pipe 1. A vacuum switch valve 23 is installed on the connection pipeline between the sealed chamber 3 and the vacuum pumping mechanism 2.

[0027] A vent valve 321 is installed on the sealed chamber 3. A discharge port 311 is provided at the bottom of the sealed chamber 3. The collection chamber 4 is located below the discharge port 311. The collection chamber 4 has a feed port, and a discharge valve 7 is installed on the connection pipeline between the discharge port 311 and the feed port.

[0028] The vacuum pumping mechanism 2, the sealed chamber 3, and the collection chamber 4 can be directly fixedly installed on a test bench to collect powder or take powder for analysis, etc., or can be installed on a mobile cart and stay at the target position for sampling and collection as needed. As Figure 1 shown, the sealed chamber 3 is located above the collection chamber 4. The inlet end of the feed pipe 1 can extend into the material container to collect the powder in the material container or take a sample from the material container. Optionally, the outlet end of the feed pipe 1 is bent, and the bent outlet end can reduce the amount of powder lifted when entering the collection chamber 4.

[0029] Optionally, the feed valve 6 is an electromagnetic switch valve. Or, the feed valve 6 is a manual valve, and the on / off of the feed pipe 1 is controlled by manually screwing the manual valve. Similarly, the discharge valve 7, the vacuum switch valve 23, and the vent valve 321 are solenoid valves or manual valves.

[0030] During use, the discharge valve 7 and the vent valve 321 are closed, the vacuum switch valve 23 is opened, and the vacuum pumping mechanism 2 evacuates the sealed chamber 3 to form a negative pressure cavity in the sealed chamber 3. When the pressure in the negative pressure cavity reaches a preset value, the feed valve 6 is opened, and the powder in the material container is conveyed into the sealed chamber 3 under the action of negative pressure.

[0031] When the powder capacity in the sealed bin 3 meets the required capacity, the feed valve 6 and the vacuum switch valve 23 are closed, and the vacuum pumping mechanism 2 stops operating. The vent valve 321 is opened to slowly restore the air pressure in the sealed bin 3 to the actual atmospheric pressure. Then, the discharge valve 7 is opened, and the powder falls into the collection bin 4 under the action of gravity.

[0032] The powder collecting device provided by the utility model has a feed pipe 1 that can be inserted into the interior of the material container. When the feed valve 6 and the discharge valve 7 are in a closed state and the vacuum switch valve 23 is in an open state, the vacuum pumping mechanism 2 can vacuum the interior of the sealed bin 3 to form a negative pressure chamber. The powder in the material container enters the sealed bin 3 along the feed pipe 1 under the action of negative pressure and is deposited in the sealed bin 3. When the powder capacity in the sealed bin 3 reaches the required capacity, the feed valve 6 and the vacuum switch valve 23 are closed, and the vent valve 321 is opened to restore the air pressure in the sealed bin 3 to the actual atmospheric pressure, thereby completing the preliminary collection of the powder. The collecting bin 4 is located below the discharge port 311, and the powder can be collected when the discharge valve 7 is opened. The entire powder acquisition process is carried out in a closed environment, and the powder will not be spilled in the air, thereby avoiding air pollution and eliminating safety hazards.

[0033] Specifically, Figure 1 As shown, the sealed chamber 3 includes a sample chamber 31 and a vacuum chamber 32. The vacuum pumping mechanism 2 is connected to the vacuum chamber 32. The vent valve 321 is installed on the vacuum chamber 32. The sample chamber 31 and the vacuum chamber 32 are connected through a connecting pipe 5. A control valve 51 is installed on the connecting pipe 5. Figure 1 As shown, the feed pipe 1 is connected to the interior of the sample feeding chamber 31. The discharge port 311 is arranged at the bottom of the sample feeding chamber 31.

[0034] Optionally, the control valve 51 is a solenoid valve, which improves the efficiency of use and reduces manual participation by means of electronic control. Of course, the control valve 51 can also be a manual valve. In the process of forming a negative pressure chamber, the control valve 51 is in an open state, so that the inside of the sample chamber 31 and the vacuum chamber 32 are both in a negative pressure state. When the powder capacity in the sample chamber 31 reaches the required capacity, the control valve 51 is closed to disconnect the vacuum chamber 32 and the sample chamber 31. Then the vent valve 321 is opened to restore the air pressure in the vacuum chamber 32 to the actual atmospheric pressure. The discharge valve 7 is opened, and the air pressure in the sample chamber 31 gradually becomes consistent with the air pressure in the collection chamber 4, and then the powder enters the collection chamber 4 from the sample chamber 31 under the action of gravity. Of course, when the powder capacity in the sample chamber 31 reaches the required capacity, the control valve 51 can be kept open, and when the air pressure in the sample chamber 31 and the vacuum chamber 32 is restored to the actual atmospheric pressure through the vent valve 321, the control valve 51 is closed.

[0035] The vacuum pumping mechanism 2 is connected to the vacuum chamber 32. The powder in the material container enters the sampling chamber 31 along the feed pipe 1 under the action of negative pressure. By dividing the sealed chamber 3 into two independent chambers, namely the sampling chamber 31 and the vacuum chamber 32, the vacuum chamber 32 forms an isolation between the sampling chamber 31 and the vacuum pumping mechanism 2, and the powder accumulates in the sampling chamber 31, preventing dust from entering the vacuum pumping mechanism 2.

[0036] Optionally, the connection port of the connecting pipe 5 to the sampling chamber 31 is located at the top of the sampling chamber 31, and / or the connection port of the feed pipe 1 to the sampling chamber 31 is located at the top of the sampling chamber 31. After the powder enters from the top of the sampling chamber 31 along the feed pipe 1, it directly falls into the sampling chamber 31 under the action of gravity. The dust formed during the falling process moves upward and gradually decelerates. Since the connection port of the connecting pipe 5 to the sampling chamber 31 is located at the top of the sampling chamber 31, only a small amount can enter the connecting pipe 5, further reducing the amount of powder entering the vacuum chamber 32 and reducing the impact of the powder on the vacuum pumping mechanism 2.

[0037] As Figure 1 shown, the bottom of the sampling chamber 31 is tapered, and the discharge port 311 is located at the small-diameter end of the sampling chamber 31. Optionally, the sampling chamber 31 includes a cylindrical section and a frustum section located below the cylindrical section. The frustum section is inverted conical, and the discharge port 311 is located at the small-diameter end of the frustum section. Among them, the cylindrical section can be cylindrical or square-columnar. Setting the discharge port 311 at the small-diameter end of the sampling chamber 31 can guide the powder to slide down along the bottom wall of the sampling chamber 31, reduce dust generation and improve the feeding speed.

[0038] As Figure 1 shown, a discharge valve 8 is provided at the bottom of the collection chamber 4. Among them, a discharge port is provided at the bottom of the collection chamber 4. The discharge valve 8 is provided at the discharge port. When the powder falls from the discharge port 311 to the collection chamber 4, the discharge valve 8 is closed. The discharge port can be connected to an external pipeline. When it is necessary to discharge the powder outward, the discharge valve 8 is opened, and the powder can be discharged from the collection chamber 4 into the external pipeline.

[0039] In some embodiments, the collection chamber 4 is transparent, and scale lines are provided on the outer wall of the collection chamber 4. Among them, multiple scale lines are arranged at intervals along the height direction of the collection chamber 4. Setting the collection chamber 4 to be transparent facilitates observing whether the accumulated volume of the powder in the collection chamber 4 reaches the target scale line, so that after the powder collection volume meets the required volume, the relevant pipelines and valves can be immediately controlled to stop continuing to collect the powder. Specifically, the user can view through the transparent collection chamber 4 whether the powder height reaches the target scale line; or, a camera can be added, and the image of the collection chamber 4 taken by the camera is used to automatically judge whether the powder height reaches the target scale line.

[0040] As Figure 1As shown, in some embodiments, the end of the feed pipe 1 is pointed, which facilitates the insertion of the feed pipe 1 into the powder in the material container.

[0041] In some embodiments, as Figure 1 shown, the powder collection device further includes a box body 10. The box body 10 has a box door 101 that can be opened. The inlet end of the feed pipe 1 extends outside the box body 10. The outlet end of the feed pipe 1 is located inside the box body 10 and communicates with the sealed chamber 3. Both the sealed chamber 3 and the vacuum pumping mechanism 2 are arranged inside the box body 10.

[0042] It can be understood that, as Figure 1 shown, the vacuum pumping mechanism 2 and the sealed chamber 3 are respectively fixedly installed inside the box body 10, and the feed pipe 1 passes through the box wall of the box body 10, so that the inlet end of the feed pipe 1 is exposed outside the box body 10, facilitating the feed pipe 1 to extend into the material container. The box body 10 has a through hole communicating with the outside. The box door 101 covers the through hole, and one side edge of the box door 101 is rotatably installed on the box body 10 through a pin shaft, thus facilitating the opening and closing of the box door 101.

[0043] By installing the vacuum pumping mechanism 2, the sealed chamber 3 and the collection bin 4 inside the box body 10, the box body 10 further ensures that the entire powder collection process is carried out in a sealed environment, preventing the powder from being exposed to the air and improving the safety factor. The collection bin 4 is close to the box door 101. After opening the box door 101, the user can operate the manual valve inside the box body 10 or take out the entire collection bin 4 from the box body 10.

[0044] In some embodiments, as Figure 1 shown, a traveling mechanism 20 is installed at the bottom of the box body 10. Optionally, the traveling mechanism 20 includes a plurality of rollers. The plurality of rollers are respectively rotatably installed on the lower side of the box body 10, and the movement of the rollers drives the entire box body 10 to move, so that the powder collection device can easily shuttle between different positions. Or, the traveling mechanism 20 includes a driving member and traveling wheels. The traveling wheels are rotatably installed on the box body 10, and the driving member is in transmission connection with the traveling wheels. The automatic traveling of the traveling mechanism 20 is realized through the driving member without manual participation.

[0045] Specifically, in some embodiments, the vacuum pumping mechanism 2 includes a vacuum pump 21 and a filter 26. The vacuum pump 21 is internally communicated with the sealed chamber 3 through a vacuum tube 22. A vacuum switch valve 23 and a filter 26 are respectively installed on the vacuum tube 22. The vacuum pump 21 and the vacuum switch valve 23 are respectively electrically connected to a controller 9.

[0046] It can be understood that the controller 9 can be a control circuit board; or, the controller 9 is a control terminal with an operation interface, which is convenient for the user to input operation instructions or view the operating status on the operation interface.

[0047] The vacuum tube 22 can be a stainless steel tube or a flexible tube. One end of the vacuum tube 22 is connected to the vacuum pump 21, and the other end is communicated with the interior of the vacuum chamber 32. The controller 9 controls the operating states of the vacuum pump 21 and the vacuum switch valve 23.

[0048] When it is necessary to evacuate the vacuum chamber 32, the controller 9 controls the vacuum switch valve 23 to open and simultaneously controls the vacuum pump 21 to start. When the powder capacity in the sample introduction chamber 31 meets the required capacity, the controller 9 controls the vacuum switch valve 23 to close and simultaneously controls the vacuum pump 21 to close.

[0049] During the process of sucking the powder, a very small amount of powder may flow along the direction of the connecting pipe 5, the vacuum chamber 32 and the vacuum tube 22. Therefore, a filter 26 is provided to prevent the powder from clogging the vacuum pump 21 and ensure the normal use of the vacuum pump 21.

[0050] Furthermore, in some embodiments, as Figure 1 shown, the vacuum tube 22 is equipped with a vacuum pressure gauge 24 and a vacuum regulating valve 25. The vacuum pressure gauge 24 is located on the side of the vacuum switch valve 23 close to the sealed chamber 3. The vacuum pressure gauge 24 and the vacuum regulating valve 25 are respectively electrically connected to the controller 9.

[0051] The vacuum pressure gauge 24 is installed on the side of the vacuum switch valve 23 close to the vacuum chamber 32 to accurately measure the pressure value in the vacuum chamber 32.

[0052] Before starting the vacuum pump 21, first ensure the accuracy of the reading of the vacuum pressure gauge 24 and calibrate it as needed. The controller 9 controls the opening degree of the vacuum regulating valve 25 according to the reading of the vacuum pressure gauge 24. Specifically, when the reading of the vacuum pressure gauge 24 reaches the target value, the controller 9 controls the vacuum regulating valve 25 to maintain the current opening degree to maintain the pressure in the vacuum chamber 32 within a preset range. For example, when the target value is 15 pa and the value of the vacuum pressure gauge 24 reaches 15 pa, the feed valve 6 is opened, and the feed pipe 1 starts to suck the powder into the sample introduction chamber 31.

[0053] Specifically, the feed valve 6, the discharge valve 7, the outlet valve 8, the vacuum switch valve 23, the vacuum regulating valve 25, the vent valve 321 and the control valve 51 are all electric valves and are respectively connected to the controller 9, and automatic control is realized by means of the controller 9.

[0054] As Figure 1 shown, the controller 9 is installed on the box body 10. A camera is installed inside the box body 10, and the camera is electrically connected to the controller 9. Specifically, the camera is oriented towards the collection chamber 4 to capture an image of the collection chamber 4, and the controller 9 determines whether the powder amount in the collection chamber 4 reaches the target scale line according to the image captured by the camera. When the powder amount in the collection chamber 4 reaches the target scale line, the controller 9 controls the relevant valve bodies to open or close.

[0055] When the traveling mechanism 20 includes a driving member and traveling wheels, the controller 9 is electrically connected to the driving member.

[0056] It should be noted that the feed pipe 1, the sample injection chamber 31, and the vacuum chamber 32 can be of an integral structure or a split structure. To adapt to different types of powders and avoid cross-contamination between powders, the sample injection chamber 31 and the vacuum chamber 32 are detachably connected. For example, the feed pipe 1, the sample injection chamber 31, and the collection chamber 4 are of an integral structure. When adjusting the type of powder to be collected, the feed pipe 1, the sample injection chamber 31, and the collection chamber 4 are removed from the vacuum chamber 32 as a whole. Alternatively, the feed pipe 1, the sample injection chamber 31, and the collection chamber 4 are of a split structure or partially integrally arranged, as long as the three can be detached from the vacuum chamber 32.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A powder collecting device, characterized in that: include: A feeding pipe, a vacuum pumping mechanism, a sealing chamber and a collecting chamber, wherein the feeding pipe is connected to the interior of the sealing chamber, and the vacuum pumping mechanism is connected to the sealing chamber, wherein a feeding valve is installed on the feeding pipe, and a vacuum switch valve is installed on the connecting pipeline between the sealing chamber and the vacuum pumping mechanism; The sealed bin is equipped with a vent valve, and a discharge port is provided at the bottom of the sealed bin; the collecting bin is located below the discharge port, and the collecting bin has a feed port, and a discharge valve is installed on the connecting pipeline between the discharge port and the feed port.

2. The powder collecting device according to claim 1, characterized in that: The sealed chamber includes a sample injection chamber and a vacuum chamber, the vacuum pumping mechanism is connected to the vacuum chamber, and the vent valve is installed on the vacuum chamber; the sample injection chamber and the vacuum chamber are connected through a connecting pipe, and a control valve is installed on the connecting pipe; The feed pipe is connected to the interior of the sample feeding chamber, and the discharge port is arranged at the bottom of the sample feeding chamber.

3. The powder collecting device according to claim 2, characterized in that: The bottom of the sample feeding bin is tapered, and the discharge port is located at the small-diameter end of the sample feeding bin.

4. The powder collecting device according to claim 1, characterized in that: A discharge valve is provided at the bottom of the collecting bin.

5. The powder collecting device according to claim 1, characterized in that: The collecting bin is transparent, and scale lines are arranged on the outer wall of the collecting bin.

6. The powder collecting device according to claim 1, characterized in that: The end of the feeding tube is pointed.

7. The powder collecting device according to claim 1, characterized in that: It also includes a compartment, which has an openable compartment door, the inlet end of the feed pipe extends out of the compartment, the outlet end of the feed pipe is located in the compartment and communicates with the sealing bin, and the sealing bin and the vacuum pumping mechanism are both arranged in the compartment.

8. The powder collecting device according to claim 7, characterized in that: A walking mechanism is installed at the bottom of the carriage.

9. The powder collecting device according to any one of claims 1 to 7, characterized in that: It also includes a controller, the vacuum pumping mechanism includes a vacuum pump and a filter, the vacuum pump is connected to the interior of the sealed chamber through a vacuum tube, the vacuum switch valve and the filter are respectively installed on the vacuum tube, and the vacuum pump and the vacuum switch valve are respectively electrically connected to the controller.

10. The powder collecting device according to claim 9, characterized in that: The vacuum tube is installed with a vacuum pressure gauge and a vacuum regulating valve, and the vacuum pressure gauge and the vacuum regulating valve are both located on a side of the vacuum switch valve close to the sealing chamber, and the vacuum pressure gauge and the vacuum regulating valve are electrically connected to the controller respectively.

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