A pneumatic conveying device and method for powder conveying

Abstract

This application provides a pneumatic conveying device and method for powder materials, including a powder silo, a pre-sump pump, and a feed silo pump. The pre-sump pump has an inlet valve and an outlet valve. The inlet of the pre-sump pump is connected to the outlet of the powder silo via the inlet valve, and the outlet of the pre-sump pump is connected to the inlet of the feed silo pump via the outlet valve. This pneumatic conveying device and method for powder materials can achieve continuous feeding, and the conveying air will not affect the powder silo.

Description

Technical Field

[0001] This invention relates to the field of material conveying technology, specifically to a pneumatic conveying device and method for powder materials. Background Technology

[0002] Currently, there are two main technical solutions for pneumatic conveying of powder.

[0003] Option 1: hopper + frequency-controlled rotary feeder + pneumatic conveying pipeline. This method adjusts the motor frequency of the rotary feeder, calculates the feeding amount based on the rotation speed, and then introduces compressed air into the pipeline to achieve powder conveying.

[0004] Option 2: Silo + Silo Pump + Pneumatic Conveying Pipeline. This method controls the opening and closing of the silo pump's inlet and outlet valves, and then introduces compressed air into the pipeline to achieve intermittent conveying of powder in units of pumps. The purpose of metering and feeding is achieved by calculating the number of conveying pumps.

[0005] However, in Scheme 1, due to the gap between the rotor and the housing of the rotary feeder, compressed air will return to the silo from the outlet of the rotary feeder through the gap, causing condensation and condensation of the compressed air, resulting in material agglomeration. In Scheme 2, when the material in the silo pump is exhausted, in order to prevent compressed air from entering the silo from the pump, the discharge valve of the silo pump needs to be closed and the feed valve opened for replenishment. During the replenishment process, the powder conveying will be intermittent, and continuous feeding cannot be achieved. Summary of the Invention

[0006] The purpose of this application is to provide a powder pneumatic conveying device and a powder pneumatic conveying method, which can realize continuous feeding and the conveying air will not affect the powder silo.

[0007] The powder pneumatic conveying device provided in this application includes a powder silo, a pre-sump pump, and a feed silo pump. The inlet of the pre-sump pump is provided with a feed valve, and the outlet of the pre-sump pump is provided with a discharge valve. The inlet of the pre-sump pump can be connected to the outlet of the powder silo through the feed valve, and the outlet of the pre-sump pump can be connected to the inlet of the feed silo pump through the discharge valve.

[0008] In one specific embodiment, at least one of the pre-loading pump and the feeding pump is equipped with an agitator.

[0009] In one specific embodiment, the powder pneumatic conveying device further includes a frequency-modulated feed valve, and the frequency-modulated feed valve is installed at the outlet of the feed hopper pump.

[0010] In one specific embodiment, the powder pneumatic conveying device further includes a pneumatic conveyor, which includes a conveying pipe, a chain, and a scraper. The chain drives the scraper to move in the conveying pipe, and the scraper is provided with a channel for the powder to pass through. The scraper is used to clean the pipe wall of the conveying pipe.

[0011] In one embodiment, the scraper includes a frame structure, at least a portion of the outer contour of the frame structure is used for cleaning the pipe wall, and the hollow portion of the frame structure forms the channel.

[0012] In one specific embodiment, the scraper includes two scraping sections, which are radially distributed along the conveying pipe; the scraping section is the frame structure, which includes an arc-shaped frame segment adapted to the pipe wall of the conveying pipe, and the arc-shaped frame segment is used to clean the pipe wall.

[0013] In one specific embodiment, the scraping part includes a connecting frame segment, the connecting frame segment and the arc-shaped frame segment are connected to form an annular frame structure, the connecting frame segments of the two scraping parts are arranged opposite to each other and fixed by bolts, the bolts pass through a chain link of the chain to fix the scraping part and the chain; and / or, the thickness of the scraper gradually decreases from the middle along the radial outward direction.

[0014] In one specific embodiment, the chain includes a horizontal section and a vertical section connected to each other. The horizontal section is provided with a feed inlet and a compressed air interface that are connected to the outlet of the feed hopper pump. The compressed air interface is located upstream of the feed inlet. The vertical section is provided with a discharge outlet.

[0015] In one specific embodiment, a fluidizing plate is provided at the junction of the horizontal segment and the vertical segment.

[0016] This application also provides a method for pneumatic conveying of powder materials, based on the pneumatic conveying device for powder materials described in any of the above claims, characterized in that it includes the following steps:

[0017] When the pre-loading silo pump needs to be fed, close the discharge valve of the pre-loading silo pump and open the feed valve of the pre-loading silo pump;

[0018] When the feed hopper pump needs to feed material, close the feed valve of the pre-feed hopper pump and open the discharge valve of the pre-feed hopper pump.

[0019] In this application, a pre-pump is installed, and the inlet and outlet valves of the pre-pump are not opened simultaneously. When the outlet valve of the pre-pump is opened to deliver powder to the feed hopper pump, the inlet valve is closed. This achieves closed-loop feeding and conveying, preventing compressed air from leaking into the powder hopper during pneumatic conveying and thus avoiding material agglomeration in the powder hopper. Moreover, after delivering powder to the feed hopper pump, the pre-pump can close the outlet valve and open the inlet valve to replenish the feed. When the powder in the feed hopper pump is insufficient again, the pre-pump can close the inlet valve and open the outlet valve to replenish the feed hopper pump in a timely manner. That is, the feed hopper pump does not need to stop working during the replenishment process, thus achieving continuous feeding. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the pneumatic conveying device for powder in the embodiments of this application;

[0021] Figure 2 for Figure 1 A-direction view;

[0022] Figure 3 for Figure 1 View from direction B;

[0023] Figure 4 for Figure 2 Enlarged view of section I in the middle;

[0024] Figure 5 for Figure 4 CC-direction section view;

[0025] Figure 6 for Figure 4 DD section view.

[0026] Figure 1-6 The annotations in the attached figures are explained as follows:

[0027] 100-Powder pneumatic conveying device;

[0028] 1. Powder silo; 2. Support frame; 3. Pre-loading silo pump; 4. Feed silo pump; 5. Feed valve; 6. Discharge valve; 71. First agitator; 72. Second agitator; 8. Powder conveyor; 81. Conveying pipe; 82. Chain; 83. Fluidizing plate; 84. Compressed air pipeline; 85. Scraper; 851. First scraper section; 8511. First arc-shaped frame section; 8512. First straight frame section; 852. Second scraper section; 8521. Second arc-shaped frame section; 8522. Second straight frame section; 853. Bolt; 8a. Feed inlet; 8b. Discharge outlet; 8c. Compressed air interface; 9. Frequency-controlled feed valve; 200. Flue. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the powder pneumatic conveying device 100 in the embodiments of this application.

[0031] The powder pneumatic conveying device 100 in this embodiment includes a powder silo 1, which is a storage component for storing a certain amount of powder. For example... Figure 1 As shown, the powder pneumatic conveying device 100 also includes a pre-loading pump 3 and a feed pump 4. The powder from the powder silo 1 first enters the pre-loading pump 3, which then conveys the powder to the feed pump 4. The feed pump 4 finally conveys the powder outward via the powder conveyor 8. In this embodiment, the powder silo 1, pre-loading pump 3, and feed pump 4 are arranged sequentially in a vertical direction. A support frame 2 can be provided, and the powder silo 1 can be supported and installed on the support frame 2. The pre-loading pump 3 and feed pump 4 are sequentially connected below the powder silo 1.

[0032] It is worth noting that in this embodiment, the pre-pump 3 has an inlet and an outlet. Its inlet is used to connect to the powder silo 1, and its outlet is used to connect to the feed silo pump 4. Furthermore, the inlet of the pre-pump 3 is equipped with a feed valve 5, which connects to the outlet of the powder silo 1. The outlet of the pre-pump 3 is equipped with a discharge valve 6, which connects to the inlet of the feed silo pump 4.

[0033] With this setup, during operation, when the pre-pump 3 needs to be fed, the discharge valve 6 can be closed and the feed valve 5 can be opened, so that the powder in the powder silo 1 can be loaded into the pre-pump 3. Then, when the feed silo pump 4 needs to be fed, the feed valve 5 can be closed and the discharge valve 6 can be opened, so that the powder loaded in the pre-pump 3 can enter the feed silo pump 4 through the discharge valve 6.

[0034] Therefore, in this embodiment, because a pre-pump 3 is provided, and the feed valve 5 and discharge valve 6 of the pre-pump 3 are not opened simultaneously, when the discharge valve 6 of the pre-pump 3 is opened to deliver powder to the feed hopper pump 4, the feed valve 5 is closed. In this way, a closed feeding and conveying system can be achieved, and the compressed air in the pneumatic conveying process cannot leak into the powder hopper 1, thereby avoiding the agglomeration of materials in the powder hopper 1. Moreover, after the pre-pump 3 delivers powder to the feed hopper pump 4, it can close the discharge valve 6 and open the feed valve 5 to replenish the feed. When the powder in the feed hopper pump 4 is insufficient again, the pre-pump 3 can close the feed valve 5 and open the discharge valve 6 to replenish the feed hopper pump 4 in a timely manner. That is, the feed hopper pump 4 does not need to stop working during the replenishment process, thereby achieving continuous feeding.

[0035] In addition, such as Figure 1 As shown, in this embodiment, the pre-pump 3 and the feed hopper pump 4 are equipped with agitators, which are respectively Figure 1 The first agitator 71 and the second agitator 72 shown can be controlled during operation to reduce or avoid material conveying obstruction caused by powder agglomeration in the silo. The structure of the agitator is not limited; for example, the agitator may include a vertical rod and multiple radially extending agitating rods connected to the vertical rod. The vertical rod drives the multiple agitating rods to rotate, thereby achieving the purpose of agitation.

[0036] Let's look again. Figure 1 In this embodiment, the powder pneumatic conveying device 100 may also include a frequency-modulated feed valve 9. The outlet of the feed hopper pump 4 is equipped with a frequency-modulated feed valve 9. The conveying amount can be adjusted by adjusting the motor frequency of the feed valve 9. The adjustment method is simple. Of course, the conveying amount of the feed hopper pump 4 can also be adjusted by other regulating valve structures.

[0037] Please continue to refer to this. Figure 1 and combined Figure 2-6 understand, Figure 2 for Figure 1 A-direction view; Figure 3 for Figure 1 View from direction B; Figure 4 for Figure 2 Enlarged view of section I in the middle; Figure 4 for Figure 4 CC-direction section view; Figure 6 for Figure 4 DD section view.

[0038] The powder pneumatic conveying device 100 in this embodiment also includes a pneumatic conveyor 8, which includes a conveying pipe 81. The conveying pipe 81 is provided with a compressed air interface 8c and a feed inlet 8a. The powder output from the feed hopper pump 4 can enter the conveying pipe 81 through the feed inlet 8a. The compressed air interface 8c can be connected to a compressed air pipeline 84. The compressed air pipeline 84 supplies compressed air to the conveying pipe 81, which can then drive the powder to flow in the conveying pipe 81 and transport it to the target location. Figure 1 In the middle, the conveying pipe 81 is equipped with a discharge port 8b, from which the powder flows into the flue 200. Of course, the powder can also be conveyed to other target locations.

[0039] In addition, the pneumatic conveyor 8 in this embodiment also includes a chain 82 and a scraper 85. The chain 82 and the scraper 85 are located inside the conveying pipe 81. The chain 81 can be driven by a motor, so that when the chain 82 moves inside the conveying pipe 81, it can drive the scraper 85 to move synchronously inside the conveying pipe 81. The scraper 85 is used to clean the pipe wall of the conveying pipe 81, and the scraper 85 is provided with a channel for the powder to pass through, such as... Figure 5 The first channel 851a and the second channel 852a shown, i.e., the scraper 85, do not obstruct the conveying of powder. In this way, the problem of clumping and blockage in the conveying pipe 81 can be improved. That is to say, the conveying pipe 81 in this embodiment has a self-cleaning function.

[0040] As mentioned earlier, the function of the scraper 85 is to clean the wall of the conveying pipe 81. The scraper 85 can have an annular outer periphery 85a, and the shape of the outer periphery 85a is adapted to the wall of the conveying pipe 81, thus allowing for comprehensive cleaning of the pipe wall. For example, if the conveying pipe 81 is generally circular, then the outer periphery 85a of the scraper 85 is also circular. Of course, if the conveying pipe 81 is designed as a square pipe, then the outer periphery of the scraper 85 is correspondingly set to have a square outer periphery. There can be a small gap between the outer periphery 85a of the scraper 85 and the wall of the conveying pipe 81 to achieve the goal of removing clumps and blockages without increasing the friction of the scraper 85's movement. Figure 5 As shown, the thickness of the scraper 85 gradually decreases from the center outwards in a radial direction, meaning that the outer periphery of the scraper 85 is pointed, which makes it easier to scrape and clean the wall of the conveying pipe 81.

[0041] In this embodiment, the pneumatic conveyor 8 includes multiple scraper discs 85, which are evenly arranged along the length of the chain 82. Each scraper disc 85 can be fixed to a link of the chain 85. The multiple scraper discs 85 allow for better cleaning of the conveying pipe 81.

[0042] You can continue to refer to this. Figure 5 In this embodiment, the scraper disc 85 includes two scraping sections: a first scraping section 851 and a second scraping section 852. The two scraping sections are fixed to chain links 821 of the chain 82, and are connected to the chain links 821, for example, by bolts. The two scraping sections are radially distributed along the conveying pipe 81 and can be arranged symmetrically in the radial direction. Each scraping section is a frame structure, including an arc-shaped frame segment that adapts to the wall of the conveying pipe 81. Each arc-shaped frame segment is semi-circular or nearly semi-circular, such as... Figure 5 The first arc-shaped frame segment 8511 and the second arc-shaped frame segment 8521 shown can be joined together to form a circular or nearly circular outer periphery 85a, thereby enabling scraping and cleaning of the pipe wall almost along 360°.

[0043] Therefore, since each plastering section has a frame structure, most of its parts are hollowed out, and the hollowed-out parts form channels for the powder to pass through. Figure 5As can be seen, the first scraping part 851 is hollowed out except for the outline portion to form the first channel 851a, and the second scraping part 852 is hollowed out except for the outline portion to form the second channel 852a. Furthermore, due to the spacing of the chain links 821, the two scraping parts 851 also form two notches 85b at their radial ends, which also serve as channels for the powder. Therefore, in this embodiment, the scraper disc 85 of the frame structure occupies a relatively small cross-sectional area, and its impact on powder passage is negligible, thus balancing powder passage performance and the unblocking function of the scraper disc 85. In addition, by providing two scraping parts for the scraper disc 85, while minimizing the occupied area, it also facilitates fixation with the connecting part 853, ensures reliable connection, and meets the strength requirements for unblocking.

[0044] like Figure 5 As shown, the frame of each scraping section also includes connecting frame segments. In this embodiment, the connecting frame segments are specifically straight frame segments, namely the first straight frame segment 8512 and the second straight frame segment 8522. The two ends of the straight frame segments are connected to the two ends of the corresponding arc-shaped frame segments. At this time, each scraping section has an approximately semi-circular or crescent-shaped frame structure, which can minimize the occupation of the flow cross section, form a larger first channel 851a and second channel 852a, and have high strength. Figure 5 In this design, the first scraping section 851 and the second scraping section 852 are connected by bolts 853. Specifically, the first straight frame segment 8512 and the second straight frame segment 8522 are connected and fixed into a roughly circular frame by bolts 853. The bolts 853 also pass through a chain link 821. Two or more bolts 821 can be used, thus fixing the scraper 85 to the chain 82. It can be seen that the first straight frame segment 8512 and the second straight frame segment 8522 do not have to be straight; a certain curvature or bend is acceptable. The straight frame segments can fit snugly against the chain link 821, making the fixation more reliable.

[0045] It is understood that the structure of the scraper 85 is not limited to this. The scraper 85 can be configured as a frame structure, with at least part of the outer contour of the frame structure serving as the outer periphery 85a for cleaning the pipe wall. For example, the scraper 85 includes a circular frame structure, with the entire outer contour of the circular frame structure serving as the outer periphery. The circular frame structure can also be connected to the chain 82 directly by radially extending connecting spokes. This embodiment does not further limit this.

[0046] Please continue to refer to this. Figure 1In this embodiment, the conveying pipe 81 includes a horizontal section and a vertical section connected to each other. The horizontal section is provided with an inlet 8a connected to the outlet of the feed hopper pump 4 and a compressed air interface 8c. The compressed air interface 8c is located upstream of the inlet 8a. The vertical section is provided with an outlet 8b. In this way, the horizontal section facilitates feeding and conveying, while the vertical section can convey the powder to a higher position as needed. Of course, the vertical section can also be omitted, for example, by setting an inclined section, or by directly conveying horizontally.

[0047] like Figure 1 As shown in this embodiment, a fluidizing plate 83 is provided at the junction of the horizontal and vertical sections of the conveying pipe 81. There is a significant bend at the junction of the horizontal and vertical sections, where the powder materials can easily interfere with each other due to changes in direction. The fluidizing plate 83 guides and diverts the powder materials at this point, facilitating their smooth passage through the bend.

[0048] This embodiment also provides a method for pneumatic conveying of powder materials, based on the above-described pneumatic conveying device 100 for powder materials, including the following steps:

[0049] When the pre-pump 3 needs to be fed, close the discharge valve 6 of the pre-pump 3 and open the feed valve 5; then the powder in the powder silo 1 will start to enter the pre-pump 3. After the pre-pump 3 is loaded with the required powder, the feed valve 5 can be closed.

[0050] When the feed hopper pump 4 needs to be fed, the discharge valve 6 of the pre-feed pump 3 is opened, and the feed valve 5 is closed to supply material to the feed hopper pump 4.

[0051] That is, if the feed valve 5 of the pre-amplifier pump 3 is open, the discharge valve 6 must be closed to ensure that the compressed air in the downstream powder conveyor 8 does not pass through the feed hopper pump 4 and the pre-amplifier pump 3 in sequence and enter the powder hopper 1. It can be seen that the feed valve 5 and the discharge valve 6 do not necessarily have to be closed one and the other closed. For example, when the feed valve 5 is closed, the discharge valve 6 can be open or closed, but it must be ensured that when the feed valve 5 is open, the discharge valve 6 is closed.

[0052] As mentioned above, the pre-loading pump 3 can be filled to full or with other amounts of powder, depending on the requirements. After the set amount of powder has been loaded, the feed valve 5 can be closed.

[0053] When the material level in the feed hopper pump 4 drops to the preset level and the powder is insufficient and needs to be fed, the discharge valve 6 of the pre-feeder pump 3 is opened, allowing some or all of the powder from the pre-feeder pump 3 to enter the feed hopper pump 4. Generally, it is set to allow all the powder to enter the feed hopper pump 4. After all the powder has entered the feed hopper pump 4, the discharge valve 6 can be closed and the feed valve 5 opened to replenish the powder in the pre-feeder pump 3. Alternatively, when the pre-feeder pump 3 replenishes the feed hopper pump 4, it can also deliver a portion of the powder. For example, the powder from the pre-feeder pump 3 can be added to the feed hopper pump 4 two or more times. After all the powder in the pre-feeder pump 3 is discharged, the discharge valve 6 is closed and the feed valve 5 is opened for replenishment. Here, by replenishing the feed hopper pump 4 only after the pre-feeder pump 3 is fully loaded, the volume of the pre-feeder pump 3 does not need to be large, and it is less prone to material accumulation, and the replenishment amount is easy to control.

[0054] When loading material, the pre-loading pump 3 can be started immediately after replenishing the feed hopper pump 4, or it can be started after replenishing the feed hopper pump 4 for a period of time. For example, when the material level of the feed hopper pump 4 drops to the preset material level, the pre-loading pump 3 can close the discharge valve 6, open the feed valve 5 to feed material, and then close the feed valve 5 and open the discharge valve 6 to supply material to the feed hopper pump 4. In this case, the preset material level setting should take into account the feeding time of the pre-loading pump 3. Alternatively, the pre-loading pump 3 can close the discharge valve 6 after the feed hopper pump 4 has distributed material, and the powder hopper 1 can replenish the material. After replenishment, the feed valve 5 can be closed. When the material level of the feed hopper pump 4 drops to the preset material level, the discharge valve 6 can be opened directly to replenish the material. In this case, the position of the preset material level does not need to take into account the feeding time of the pre-loading pump 3, and the preset material level can be designed to be lower. That is, the timing of the connection between the feed hopper pump 4 and the pre-feed pump 3 can be adjusted. As long as the pre-feed pump 3 can replenish the feed hopper pump 4 in time when the feed hopper pump 4 needs to be replenished, the continuous feeding of the feed hopper pump 4 can be guaranteed.

[0055] When the material level of the feed hopper pump 4 drops to the preset material level, an alarm or other signal can be given to prompt the pre-loading pump 3 to supply material to the feed hopper pump 4. The discharge valve 6 and the feed valve 5 can both be electrically controlled valves, which can be opened or closed according to the corresponding requirements.

[0056] Specifically, in this embodiment, the following steps can be followed:

[0057] S1. During initial operation, close the discharge valve 6 of the pre-pump 3 and open its feed valve 5 to feed the powder silo 1 into the pre-pump 3.

[0058] S2. When the pre-loading silo pump 3 is full of powder, close the feed valve 5 and then open the discharge valve 6. All the powder from the pre-loading silo pump 3 enters the feed silo pump 4, and then close the discharge valve 6.

[0059] S3. The amount of powder pneumatic conveying is changed by adjusting the motor frequency of the frequency-adjustable feed valve 9.

[0060] S4. When the material level of the feed hopper pump 4 drops to the preset material level, an alarm will be triggered, and the above steps will be repeated.

[0061] With repeated cyclical operation, the feed hopper pump 4 always contains powder material, enabling continuous and uninterrupted material discharge.

[0062] In addition, in this embodiment, the pre-loading pump 3 can have a powder metering function. A control system can be set up, which can calculate the powder conveying volume per unit time by counting the number of times the feed valve 5 is opened and closed per unit time, thus realizing the metering function. It can be seen that the powder metering is not limited to being performed through the pre-loading pump 3; for example, the discharge volume of the feed hopper pump 4 can also be counted.

[0063] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A pneumatic conveying device for powder materials, characterized in that, The system includes a powder silo, a pre-pump, and a feed silo pump. The pre-pump is equipped with an inlet valve and an outlet valve. The inlet of the pre-pump can be connected to the outlet of the powder silo through the inlet valve, and the outlet of the pre-pump can be connected to the inlet of the feed silo pump through the outlet valve. The powder pneumatic conveying device further includes a pneumatic conveyor, which includes a conveying pipe, a chain, and a scraper. The chain drives the scraper to move in the conveying pipe. The scraper is provided with a channel for the powder to pass through and is used to clean the pipe wall of the conveying pipe. The scraper includes a frame structure, at least a portion of the outer contour of the frame structure is used for cleaning the pipe wall, and the hollow portion of the frame structure forms the channel; The scraper includes two scraping sections, which are radially distributed along the conveying pipe. The scraping section is a frame structure, which includes an arc-shaped frame segment that is adapted to the pipe wall of the conveying pipe and is used to clean the pipe wall. The scraping part includes a connecting frame segment, which is connected to the arc-shaped frame segment to form a ring-shaped frame structure. The connecting frame segments of the two scraping parts are arranged opposite to each other and fixed by bolts. The bolts pass through a chain link of the chain to fix the scraping part and the chain; and / or, the thickness of the scraper gradually decreases from the center outward in a radial direction. The chain includes a horizontal section and a vertical section connected to each other. The horizontal section is provided with a feed inlet and a compressed air interface that are connected to the outlet of the feed hopper pump. The compressed air interface is located upstream of the feed inlet. The vertical section is provided with a discharge outlet. A fluidizing plate is provided at the junction of the horizontal segment and the vertical segment.

2. The powder pneumatic conveying device according to claim 1, characterized in that, At least one of the pre-loading pump and the feeding pump is equipped with an agitator.

3. The powder pneumatic conveying device according to claim 1, characterized in that, The powder pneumatic conveying device also includes a frequency-controlled feed valve, which is installed at the outlet of the feed hopper pump.

4. A method for pneumatic conveying of powder materials, based on the pneumatic conveying device for powder materials according to any one of claims 1-3, characterized in that, Includes the following steps: When the pre-loading silo pump needs to be fed, close the discharge valve of the pre-loading silo pump and open the feed valve of the pre-loading silo pump; When the feed hopper pump needs to feed material, close the feed valve of the pre-feed hopper pump and open the discharge valve of the pre-feed hopper pump.

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