Interlocking powder collecting device

Abstract

The utility model discloses an interlocking powder collecting device which comprises a powder container, an upper valve and a lower valve, the upper valve and the lower valve are arranged at the two ends of the powder container respectively, and the upper valve and the lower valve are connected to an interlocking control circuit. The interlocking control circuit is used for controlling the lower valve to be opened only when the upper valve is closed, and the lower valve continues to be opened for a first preset time so that powder can fall out of the powder container. And the control module is used for controlling the upper valve to be opened for a second preset time only when the lower valve is closed, so that the powder falls into the powder container from the upper side. According to the interlocking powder collecting device, on the basis that manpower is not needed and the cost is reduced, rapid and automatic powder collecting can be achieved, external air can be prevented from entering pharmaceutical equipment, medicine powder is prevented from being polluted, and the high quality of medicine is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of pharmaceutical equipment, and more specifically, to an interlocking powder collection device. Background Art

[0002] In the pharmaceutical field, the equipment used includes pharmaceutical equipment, drug drying equipment, spray drying towers, powder separators, and powder collection equipment. The existing powder collection methods are closed powder collection or manual powder collection. Refer to Figure 1 , Figure 1 which is a schematic diagram of the existing powder collection equipment, showing a cyclone separator 101, a powder collection buffer barrel 102, and a powder collection barrel 103. There is an upper manual butterfly valve 104 between the powder collection buffer barrel 102 and the cyclone separator 101 to control whether the pharmaceutical powder can fall from the cyclone separator 101 into the powder collection buffer barrel 102. There is a lower manual butterfly valve 105 between the powder collection buffer barrel 102 and the powder collection barrel 103 to control whether the pharmaceutical powder can fall from the powder collection buffer barrel 102 into the powder collection barrel 103. It can be seen that the powder collection barrel 103 used is an ordinary barrel, detachably installed at the lower part of the powder collection buffer barrel 102. When powder collection is required, the operator needs to manually close the above-mentioned upper manual butterfly valve 104, then place the powder collection barrel 103 under the powder collection buffer barrel 102 and connect it with a chuck 106, and then open the lower manual butterfly valve 105. The pharmaceutical powder in the powder collection buffer barrel 102 will fall into the powder collection barrel 103 under the action of gravity. When the powder collection is completed, the operator also needs to manually close the lower manual butterfly valve 105, and open the upper manual butterfly valve 104 to allow the pharmaceutical powder to fall from the cyclone separator 101 into the powder collection buffer barrel 102, then unlock the chuck 106, remove the powder collection barrel 103, and then pour the pharmaceutical powder in the powder collection barrel 103 into a clean bag. It can be seen that there are some problems with this existing technology: manual powder collection is required throughout the process, the operator needs to regularly open and close the manual butterfly valve, and also needs to manually pour out the relatively heavy pharmaceutical powder in the powder collection barrel, which is time-consuming and laborious, with low work efficiency and high labor costs. Moreover, if the manual closing of the butterfly valve is not tight enough or there is a misoperation, it will cause the air in the clean area to enter the interior of the pharmaceutical equipment, resulting in the risk of pharmaceutical powder being contaminated, thus affecting the quality of the drugs. Summary of the Utility Model

[0003] To solve the above technical problems, the utility model provides an interlocking powder collection device, which can achieve fast and automatic powder collection on the basis of eliminating the need for manual labor and reducing costs, and can prevent external air from entering the interior of the pharmaceutical equipment, avoid contamination of the pharmaceutical powder, and ensure the high quality of the drugs.

[0004] An interlocking powder collecting device provided by the utility model includes a powder container, an upper valve and a lower valve respectively arranged at two ends of the powder container. The upper valve and the lower valve are connected to an interlocking control circuit, which is used to control that the lower valve can be opened only when the upper valve is closed and lasts for a first preset time to let the powder fall out of the powder container, and is used to control that the upper valve can be opened only when the lower valve is closed and lasts for a second preset time to let the powder fall into the powder container from above.

[0005] Preferably, in the above-mentioned interlocking powder collecting device, a transparent pipeline sight glass is further connected to the upper part of the upper valve.

[0006] Preferably, in the above-mentioned interlocking powder collecting device, a connecting component is further provided at the upper part of the pipeline sight glass, and the other end of the connecting component is used to be connected to a separator.

[0007] Preferably, in the above-mentioned interlocking powder collecting device, a supporting cage is further connected to the lower part of the lower valve, and a powder collecting bag is sleeved on the outer peripheral part of the supporting cage.

[0008] Preferably, in the above-mentioned interlocking powder collecting device, the overall shape of the supporting cage is in the shape of a birdcage, and includes a first preset number of vertical rods and a second preset number of annular horizontal rods. The intersections of the vertical rods and the annular horizontal rods are fixed together. The vertical rods are located inside the annular horizontal rods, and the vertical rods have bending parts. The part above the bending part gradually increases in diameter from top to bottom, and the part below the bending part is distributed along the vertical direction.

[0009] Preferably, in the above-mentioned interlocking powder collecting device, the diameter of the powder container gradually increases from top to bottom.

[0010] Preferably, in the above-mentioned interlocking powder collecting device, the taper range of the vertical section of the powder container is from 5° to 30°.

[0011] Preferably, in the above-mentioned interlocking powder collecting device, the inner wall of the powder container is a polished mirror surface.

[0012] Preferably, in the above-mentioned interlocking powder collection device, the interlocking control circuit includes an air switch connected to a power source. The other end of the air switch is sequentially connected to a normally closed emergency stop button, an interlocking button for switching between manual mode and automatic mode, a first power-on delay closing time timer, and an interlocking control sub-circuit. The interlocking control sub-circuit includes four parallel branches. Among them, the first branch includes a normally open button of the first power-on delay closing time timer and a second power-on delay closing time timer connected in series. The second branch includes a normally closed button of the first power-on delay closing time timer and a third power-on delay closing time timer. The third branch includes a normally open button of the second power-on delay closing time timer and a first compressed air switch valve for controlling the opening and closing of the upper valve. The fourth branch includes a normally open button of the third power-on delay closing time timer and a second compressed air switch valve for controlling the opening and closing of the lower valve;

[0013] The first power-on delay closing time timer is used to immediately energize the second branch after being powered on, so that the third power-on delay closing time timer is energized and after a certain period of time, the normally open button of the third power-on delay closing time timer is closed to open the second compressed air switch valve, so that the lower valve is opened. At this time, the first branch is not energized, so that the second power-on delay closing time timer is not energized, so that the first compressed air switch valve remains closed, so that the upper valve remains closed;

[0014] The first power-on delay closing time timer is used to disconnect the normally closed button of the first power-on delay closing time timer after the second compressed air switch valve is opened for a certain period of time to close the second compressed air switch valve, so that the lower valve is closed. At the same time, it is used to close the normally open button of the first power-on delay closing time timer to energize the second power-on delay closing time timer. After a certain period of time, the normally open button of the second power-on delay closing time timer is closed to open the first compressed air switch valve, so that the upper valve is opened. Until after a certain period of time, the first compressed air switch valve is closed, and the above process is repeated.

[0015] Preferably, in the above-mentioned interlocking powder collection device, both the upper valve and the lower valve are butterfly valves.

[0016] As can be seen from the above technical solution, in the above-described interlocking powder collection device provided by the present utility model, since it includes an upper valve and a lower valve disposed at both ends of the powder container, and the upper valve and the lower valve are connected to an interlocking control circuit, the interlocking control circuit is configured to control that the lower valve can be opened only when the upper valve is closed and continue for a first preset time to let the powder fall out of the powder container, and is configured to control that the upper valve can be opened only when the lower valve is closed and continue for a second preset time to let the powder fall into the powder container from above. It can be seen that only one of the upper valve and the lower valve can be opened at the same time, and after any valve is opened for a period of time, the state can be automatically switched. This process can be an automated operation, and the valve closing is ensured to be sufficiently tight. Therefore, the device can achieve rapid automated powder collection on the basis of eliminating the need for manual labor and reducing costs, and can prevent external air from entering the interior of the pharmaceutical equipment, avoid powder contamination, and ensure the high quality of the medicine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of 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 drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0018] Figure 1 Schematic diagram of an existing powder collection device;

[0019] Figure 2 Schematic diagram of the overall structure of an embodiment of an interlocking powder collection device provided by the present utility model;

[0020] Figure 3 Schematic diagram of the interlocking circuit adopted by the interlocking powder collection device of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The core of the present utility model is to provide an interlocking powder collection device, which can achieve rapid automated powder collection on the basis of eliminating the need for manual labor and reducing costs, and can prevent external air from entering the interior of the pharmaceutical equipment, avoid powder contamination, and ensure the high quality of the medicine.

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] An embodiment of an interlocking powder collection device provided by the present utility model is as follows Figure 2 as shown Figure 2 FIG. Figure 2 is a schematic diagram of the overall structure of an embodiment of an interlocking powder collection device provided by the present utility model. The interlocking powder collection device may include a powder container 1, an upper valve 2 and a lower valve 3 respectively disposed at both ends of the powder container 1. The upper valve 2 and the lower valve 3 are connected to an interlocking control circuit 4. The interlocking control circuit 4 is configured to control that the lower valve 3 can be opened only when the upper valve 2 is closed and last for a first preset time to let the powder fall out of the powder container 1, and is configured to control that the upper valve 2 can be opened only when the lower valve 3 is closed and last for a second preset time to let the powder fall into the powder container 1 from above.

[0024] It should be noted that during use, the upper end of the powder container 1 is connected to a cyclone separator through an upper valve 2 to control the falling of the medicinal powder from the cyclone separator into the powder container 1 at an appropriate time. Moreover, the lower end of the powder container 1 is connected to a relevant medicinal powder packaging container, such as a powder collection bag, through a lower valve 3. The key design point of this powder container 1 is that the upper valve cannot be opened when powder falls at its lower part. Because if the upper valve is opened, it will cause external air to enter the cyclone separator and even continue to blow into other relevant pharmaceutical equipment, thus affecting the quality of the medicinal powder. And when the upper valve is opened to let the medicinal powder in the cyclone separator enter the powder container 1, the lower valve cannot be opened either. Because if the lower valve is opened and there is no relevant medicinal powder packaging container to catch the powder below at this time, the powder will fall to the ground and cause waste, resulting in higher production costs. Based on this, an interlock control circuit 4 is connected to both the upper valve 2 and the lower valve 3 simultaneously to control whether they are opened and how long they are opened. The interlock of the two can be achieved. That is to say, when the upper valve 2 is opened, the lower valve 3 is locked and cannot be opened. And when the lower valve 3 is opened, the upper valve 2 is locked and cannot be opened. In this way, it can prevent external air from entering the equipment interior, ensure the stability of the internal air pressure and wind speed of the equipment. Moreover, such an interlock control circuit 4 can use components such as an electrified delay closing time relay to adjust the opening duration of the two valves. Specifically, it can adjust the parameters of the corresponding electrified delay closing time relay in the interlock control circuit 4 according to the duration required for each opening of the lower valve 3 to let the medicinal powder move downward to fill the medicinal powder packaging container to achieve matching with this duration. And it can adjust the parameters of the corresponding electrified delay closing time relay in the interlock control circuit 4 according to the duration required for each opening of the upper valve 2 to let the medicinal powder fall from the cyclone separator into the powder container 1 to achieve matching with this duration. In this way, the whole process does not require manual intervention and can be achieved only through the automatic operation of the equipment, saving labor costs and improving production efficiency. And if the opening and closing of the valves are controlled automatically by using this circuit, the closing process can be ensured to be more airtight, unlike in the prior art where the operator closes the valve, sometimes resulting in the valve not being closed tightly enough and causing external air to enter the equipment and contaminate the medicinal powder.

[0025] As can be seen from the above technical solution, in the embodiment of the interlocking powder collection device provided by the present utility model, since it includes an upper valve and a lower valve provided at both ends of the powder container, and the upper valve and the lower valve are connected to an interlocking control circuit, the interlocking control circuit is used to control that the lower valve can be opened only when the upper valve is closed and continue for a first preset time to let the powder fall out of the powder container, and is used to control that the upper valve can be opened only when the lower valve is closed and continue for a second preset time to let the powder fall into the powder container from above. It can be seen that only one of the upper valve and the lower valve can be opened at the same time, and after any valve is opened for a period of time, its state can be automatically switched. This process can be an automated operation, and the valve closure is ensured to be tight enough. Therefore, the device can achieve fast automated powder collection on the basis of eliminating manual labor and reducing costs, and can prevent external air from entering the interior of the pharmaceutical equipment, avoid powder contamination, and ensure the high quality of the medicine.

[0026] Continuing to refer to Figure 2 , in a specific implementation of the above interlocking powder collection device, on the basis of the above embodiment, a transparent pipeline sight glass 5 is further connected to the upper part of the upper valve 2. In this case, relevant operators can clearly see the real-time powder collection state inside, and can timely detect the powder blockage situation so as to take countermeasures, thereby preventing equipment damage caused by too long powder blockage time. In a further embodiment, the upper part of the pipeline sight glass 5 may further have a connecting component 6, and the other end of the connecting component 6 is used to connect to a separator. Specifically, the connecting component 6 may but is not limited to a chuck, and this chuck can ensure a more firm and sealed connection. Moreover, the structure of the above pipeline sight glass 5 may specifically include an annular pipeline made of tempered glass located inside and multiple metal rods located outside the pipeline. The upper and lower parts of these metal rods can be fixed to the chuck by bolts to achieve the firm connection of the entire structure, support the space at this position to prevent the tempered glass pipeline from bearing pressure, and moreover, both the metal rod and the chuck can preferably be made of 316 stainless steel, so as to ensure a longer service life. Of course, other materials can also be selected according to actual needs, which is not limited here. In a further embodiment, continuing to refer to Figure 2, the lower part of the lower valve 3 can also be connected to a support cage 7, and the outer periphery of the support cage 7 can be used to cover a powder collection bag. It should be noted that most parts of this support cage 7 are open to achieve the smooth falling of the powder and will not hinder the falling process of the powder. The support cage 7 is used to support the powder collection bag from the inside to collect the powder. When collecting the powder, the opening of the powder collection bag can be inserted into the support cage 7 from bottom to top, and the opening can be tightened and fixed at the top. At this time, the lower valve can be opened to allow the powder to fall directly into the powder collection bag. After a period of time, the powder collection is completed and the powder collection bag can be directly taken down. It can be seen that this omits the powder pouring link in the prior art and greatly improves the work efficiency. In a further embodiment, the overall shape of the support cage 7 can be as follows Figure 2 As shown, it is preferably in the shape of a birdcage, and may preferably include a first preset number of vertical rods 71 ​​and a second preset number of annular transverse rods 72, the first preset number and the second preset number can be selected according to actual needs, when the number used is more, higher strength can be guaranteed, but there will be more obstacles to the powder, the intersection of the vertical rod 71 and the annular transverse rod 72 is fixed together, the vertical rod 71 is located on the inner side of the annular transverse rod 72, which can prevent the powder bag from being scratched, and the vertical rod 71 has a bending portion, the portion above the bending portion gradually increases in diameter from top to bottom, and the portion below the bending portion is distributed in the vertical direction, such a gradually increasing diameter structure can ensure that a larger capacity powder bag is supported, so that each powder bag can be used to collect more powder, of course, other shapes can also be selected according to actual needs, which is not limited here.

[0027] Continue to refer Figure 2 In another specific embodiment of the interlocking powder collecting device, based on the above embodiment, the diameter of the powder container 1 gradually increases from top to bottom. It should be noted that this thin-top and thick-bottom powder container 1 can reduce the flow rate of the powder-containing air, so the dust can settle quickly, thereby reducing the density of the dust in the cyclone separator. The medicinal powder is discharged once in a short period of time at the bottom of the large-diameter powder container 1, which can greatly reduce the risk of dust accumulation. Specifically, the taper range of the vertical cross-section of the powder container 1 can be preferably 5° to 30°, and the inner wall of the powder container 1 can be preferably a polished mirror surface, preferably with a roughness of ≤0.05μm, so that the friction on the powder can be reduced to the greatest extent, thereby preventing the powder from adhering to the inner wall, which can better avoid the occurrence of powder blockage problems.

[0028] In another specific embodiment of the above interlocking powder collecting device, based on the above embodiments, reference is made to Figure 3 , Figure 3Schematic diagram of the interlock circuit adopted by the interlock powder collection device of the present application. The interlock control circuit 5 includes air switches L1 and L2 connected to the power supply. The upper part of such an air switch can be connected to the 24V main power supply, and the lower part is connected to such an interlock control circuit. The other end of the air switch is sequentially connected with a normally closed emergency stop button SB1 with a self-locking function and a red light that lights up after being pressed, an interlock button SB2 with a self-locking function and a green light that lights up after being pressed for switching between the manual mode and the automatic mode, a first power-on delay closing timer KT1 with a reset function for switching the opening and closing of the upper valve and the lower valve, and an interlock control sub-circuit 51. The interlock control sub-circuit 51 can include four parallel branches. Among them, the first branch 511 includes a normally open button KT11 of the first power-on delay closing timer and a second power-on delay closing timer KT2 connected in series. The second branch 512 includes a normally closed button KT12 of the first power-on delay closing timer and a third power-on delay closing timer KT3. The third branch 513 includes a normally open button KT21 of the second power-on delay closing timer and a first compressed air switch valve KM1 for controlling the on-off of the upper valve 2. The fourth branch 514 includes a normally open button KT31 of the third power-on delay closing timer and a second compressed air switch valve KM2 for controlling the on-off of the lower valve 3;

[0029] The first power-on delay closing timer KT1 is used to immediately energize the second branch 512 after power-on to energize the third power-on delay closing timer KT3 and keep it energized for a certain period of time to close the normally open button KT31 of the third power-on delay closing timer to open the second compressed air switch valve KM2. After the KM2 is energized, compressed air is introduced into the lower valve 3 to open the lower valve 3. At this time, the first branch 511 is not energized, so the second power-on delay closing timer KT2 is not energized, and the first compressed air switch valve KM1 remains closed, so that the upper valve 2 remains closed;

[0030] The first power-on delay closing timer KT1 is used to disconnect the normally closed button KT12 of the first power-on delay closing timer after the second compressed air switch valve KM2 is opened for a certain period of time to close the second compressed air switch valve KM2, so that the lower valve 3 is closed. At the same time, it is used to close the normally open button KT11 of the first power-on delay closing timer to energize the second power-on delay closing timer KT2 and keep it energized for a certain period of time to close the normally open button KT21 of the second power-on delay closing timer to open the first compressed air switch valve KM1. The KM1 is used to control the on-off of the compressed air. When it is energized, compressed air can be introduced into the upper valve 2 to open the upper valve 2 until it is powered off after a certain period of time, so that the first compressed air switch valve KM1 is closed to automatically close the upper valve 2, and the above process is repeated.

[0031] It should be noted that when an accident occurs, the above-mentioned normally closed emergency stop button SB1 can be red. Pressing the above-mentioned normally closed emergency stop button SB1 will cut off the power supply of the system circuit, and the valve islands controlling the upper valve and the lower valve will both lose power. This is because the valves used are normally closed valves. When there is no air source to provide air pressure, both the upper valve and the lower valve are in the closed state. Moreover, the above-mentioned interlock button SB2 can be a green button and can include a normally closed switch on the left and a normally open switch on the right. The normally closed switch is connected to the manual circuit, and the normally open switch is connected to the interlock control sub-circuit 51. In this case, pressing the button SB2 will turn on the automatic program, and the automatic program will run automatically. If SB2 is not pressed, the system will turn on the manual program. On this basis, continue to refer to Figure 3 , a first manual switch SB3 and a second manual switch SB4 can also be provided. Among them, the first manual switch SB3 can be a white normally open button with a self-locking function. Pressing it will turn on the light, and it is in Figure 3 the same path as KM2 in Figure 3 , and pressing it will open the lower valve 3. The second manual switch SB4 can be a white normally open button with a self-locking function. Pressing it will turn on the light, and it is in

[0032] The usage process of the above-mentioned interlock powder collection device can be as follows:

[0033] When manual operation is required, do not press SB2. Press SB3, and the lower valve 3 will open. Press SB3 again, and the lower valve 3 will close. Press SB4, and the upper valve 2 will open. Press SB4 again, and the upper valve 2 will close.

[0034] When automatic operation is required, press SB2, KT1 is energized, KT3 is energized. After KT3 reaches the set delay time, the normally open button KT31 closes, and the lower valve 3 opens;

[0035] After KT1 reaches the set delay time, the normally closed button KT12 opens, which causes KT3 to lose power, and then causes the lower valve 3 to close;

[0036] At the same time, the normally open button KT11 closes, KT2 is energized. After KT2 reaches the set delay time, the normally open button KT21 closes, and the upper valve 2 opens;

[0037] After KT1 reaches the set time and resets, the normally open switch KT11 opens, and the normally closed switch KT12 closes, entering the next cycle.

[0038] Based on another specific embodiment of the above interlocking powder collection device, the upper valve 2 and the lower valve 3 can both be further preferably butterfly valves, and they can be pneumatic butterfly valves. It should be noted that by using such pneumatic butterfly valves, the risk of the butterfly valves not closing tightly can be avoided through program control. The upper and lower butterfly valves are interlocked, which can more effectively ensure that external air does not enter the interior of the equipment.

[0039] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An interlocking powder collecting device, characterized in that: The invention comprises a powder container and an upper valve and a lower valve respectively arranged at two ends of the powder container, wherein the upper valve and the lower valve are connected to an interlock control circuit, and the interlock control circuit is used to control that the lower valve can be opened only when the upper valve is closed and lasts for a first preset time to drop the powder out of the powder container, and is used to control that the upper valve can be opened only when the lower valve is closed and lasts for a second preset time to drop the powder into the powder container from the top.

2. The interlocking powder collecting device according to claim 1, characterized in that: The upper part of the upper valve is also connected with a transparent pipeline sight glass.

3. The interlocking powder collecting device according to claim 2, characterized in that: The upper portion of the bore sight glass is further provided with a connecting component, and the other end of the connecting component is used for connecting to a separator.

4. The interlocking powder collecting device according to claim 3, characterized in that: The lower part of the lower valve is also connected to a support cage, and the outer periphery of the support cage is used for sleeve-mounting a powder collection bag.

5. The interlocking powder collecting device according to claim 4, characterized in that: The overall shape of the support cage body is a birdcage, and includes a first preset number of vertical rods and a second preset number of annular transverse rods, the intersection of the vertical rods and the annular transverse rods are fixed together, the vertical rods are located on the inner side of the annular transverse rods, and the vertical rods have a bending portion, the portion above the bending portion gradually increases in diameter from top to bottom, and the portion below the bending portion is distributed along the vertical direction.

6. The interlocking powder collecting device according to claim 1, characterized in that: The diameter of the powder container increases gradually from top to bottom.

7. The interlocking powder collecting device according to claim 6, characterized in that: The taper of the vertical cross section of the powder container ranges from 5° to 30°.

8. The interlocking powder collecting device according to claim 7, characterized in that: The inner wall of the powder container is a polished mirror surface.

9. The interlocking powder collecting device according to any one of claims 1 to 8, characterized in that: The interlock control circuit includes an air switch connected to a power supply, the other end of the air switch is connected in sequence with a normally closed emergency stop button, an interlock button for switching between a manual mode and an automatic mode, a first power-on delay closing time timer and an interlock control subcircuit, the interlock control subcircuit includes four branches in parallel, wherein the first branch includes a first power-on delay closing time timer normally open button and a second power-on delay closing time timer connected in series, the second branch includes a first power-on delay closing time timer normally closed button and a third power-on delay closing time timer, the third branch includes a second power-on delay closing time timer normally open button and a first compressed air switch valve for controlling the on and off of the upper valve, and the fourth branch includes a third power-on delay closing time timer normally open button and a second compressed air switch valve for controlling the on and off of the lower valve; The first power-on delay closing time timer is used to immediately power on the second branch circuit after power-on so as to power on the third power-on delay closing time timer and close the normally open button of the third power-on delay closing time timer after a certain period of time so as to open the second compressed air switch valve, so as to open the lower valve, and at this time, the first branch circuit is not powered on so as to not power on the second power-on delay closing time timer so as to keep the first compressed air switch valve closed, so as to keep the upper valve closed; The first power-on delay closing time timer is used to disconnect the normally closed button of the first power-on delay closing time timer to close the second compressed air switch valve after the second compressed air switch valve is opened for a certain period of time, so as to close the lower valve. At the same time, it is used to close the normally open button of the first power-on delay closing time timer to energize the second power-on delay closing time timer and then close the normally open button of the second power-on delay closing time timer to open the first compressed air switch valve after a certain period of time, so as to open the upper valve. After a certain period of time, the first compressed air switch valve is closed, and the above process is repeated.

10. The interlocking powder collecting device according to claim 9, characterized in that: The upper valve and the lower valve are both butterfly valves.

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