Pneumatic control box for pneumatic feeding machine

Abstract

The utility model discloses an air control box for a pneumatic feeding machine. The air control box comprises a high-pressure air source, a mechanical opening valve, a mechanical stopping valve, a material suction circulation air control valve assembly and a material suction circulation air control switching valve, wherein the mechanical opening valve, the mechanical stopping valve, the material suction circulation air control valve assembly and the material suction circulation air control switching valve are all connected with the high-pressure air source. The material suction circulating pneumatic control valve assembly comprises a material suction pneumatic control valve group and a material discharging pneumatic control valve group; the material suction pneumatic control valve group comprises a bottom valve opening and closing valve, a vacuum valve opening valve and a material suction and discharge switching valve; the mechanical opening valve can close the bottom valve, the vacuum generator is started, and material suction is started; the discharging pneumatic control valve group comprises a pulse valve opening valve, a flow aid opening valve and a discharging and sucking switching valve; the mechanical stop valve can trigger the material suction circulation pneumatic control switching valve to be switched from the opening position PA to the closing position AR, and material suction is stopped. The mechanical opening valve is used for achieving material suction and discharging circulation control through one key, the mechanical stopping valve is used for jumping out of material suction and discharging circulation control through one key, electricity is not needed in the whole process, operation is easy and fast, and the use safety in the anti-explosion environment is greatly improved.

Description

Technical Field

[0001] This utility model relates to a pneumatic control box for a powder hopper docking equipment, and in particular a pneumatic control box for a pneumatic feeder. Background Technology

[0002] A pneumatic feeder is a device that uses the Venturi effect to create a vacuum, drawing a mixture of material and air into its own storage chamber. For example... Figure 2 As shown, the pneumatic feeder 20 includes a feeder body 21, a suction pipe 22, a filter assembly, a vacuum adsorption assembly, and a discharge assembly. The feeder body has a storage chamber 211, and the suction pipe 22 is located on one side of the storage chamber. The filter assembly includes filter media 23 and a pulse valve 231; the filter media is located in the storage chamber above the suction pipe, and the top of the filter media is connected to a high-pressure air source through a blowing pipe; the pulse valve is located on the blowing pipe and can perform pulse blowing on the filter media from top to bottom. The vacuum adsorption assembly includes a vacuum generator 24 and a vacuum valve 241; the vacuum generator is located at the top of the storage chamber, and the air inlet of the vacuum generator is connected to the high-pressure air source through the vacuum valve. The discharge assembly includes a bottom valve 25 and a flow aid 26; the bottom valve is located at the bottom of the storage chamber, and the flow aid is located on the outer side wall of the bottom of the feeder body above the bottom valve.

[0003] The storage chamber, also known as the collection chamber, located below the filter media, has a small volume, which facilitates continuous and stable material supply and avoids supply fluctuations. Due to the small volume of the collection chamber, it is necessary to perform cyclic suction and discharge actions during material supply to maintain a stable powder level in the collection chamber.

[0004] 1. The material feeding process is as follows:

[0005] 1A. Ensure that the bottom valve, flow aid, and pulse valve are all in the closed position.

[0006] 1B. The vacuum valve is opened, the vacuum generator is started, and the storage chamber is in a vacuum negative pressure state.

[0007] 1C. The powder enters the storage chamber through the suction pipe to achieve material suction.

[0008] 2. After the set feeding time has elapsed, the feeding process begins, specifically as follows:

[0009] 2A. When the vacuum valve is closed, the vacuum generator stops working, the negative pressure in the storage chamber is released, and the suction pipe stops sucking materials.

[0010] 2B. The bottom valve, flow aid, and pulse valve open simultaneously; the powder in the storage chamber enters the feeding point through the bottom valve; the flow aid vibrates the bottom of the feeder body to assist the storage chamber in discharging the powder; the pulse valve provides a downward pulse backflush airflow to the top of the filter media, which not only causes the powder adhering to the filter media to fall into the storage chamber below, but also assists in discharging the powder.

[0011] 3. When the feeding time reaches the set time, a new round of feeding will begin, so that feeding and feeding will cycle until the feeding ends.

[0012] Currently, the opening sequence and duration of the aforementioned bottom valve, flow aid, pulse valve, and vacuum valve are all controlled by a PLC system, which involves the construction of many cables. Sometimes, the power supply distance is far, which increases costs considerably. When the equipment is used in explosion-proof areas, in order to avoid the risk of explosion, some customers will want the on-site control system to be free of electricity. Therefore, the existing pneumatic control box will not meet the needs of customers. Utility Model Content

[0013] The technical problem to be solved by this utility model is to provide a pneumatic control box for a pneumatic feeder, which is designed to address the shortcomings of the prior art. This pneumatic control box can be used in an explosion-proof environment without circuit control. It uses a mechanical opening valve to achieve one-button control of material suction and discharge cycles, and a mechanical stop valve to exit the material suction and discharge cycles with one button. The whole process does not require electricity and is simple and quick to operate, which greatly improves the safety of use in explosion-proof environments.

[0014] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0015] A pneumatic control box for a pneumatic feeder includes a high-pressure air source and a mechanical opening valve, a mechanical stopping valve, a suction circulation pneumatic control valve assembly, and a suction circulation pneumatic control switching valve, all connected to the high-pressure air source.

[0016] The suction circulation pneumatic control valve assembly includes a suction pneumatic control valve group and a discharge pneumatic control valve group.

[0017] The material suction pneumatic control valve assembly includes a bottom valve opening / closing valve, a vacuum valve opening valve, and a material suction / discharge switching valve.

[0018] The foot valve has a closed position PA and an open position PB, which are used to control the closing and opening of the foot valve, respectively.

[0019] Both the vacuum valve opening valve and the material suction circulation pneumatic control switching valve have an open position PA and a closed position AR that is connected to the atmosphere.

[0020] The suction / discharge switching valve is a pneumatically controlled time-delay valve with an open position PB and a delayed closed position PA. The delayed closed position PA of the suction / discharge switching valve can delay the opening of the bottom valve's open position PB.

[0021] The mechanical opening valve can keep the bottom valve in the closed position PA and simultaneously keep the suction circulation pneumatic switching valve in the open position PA.

[0022] When the suction circulation pneumatic control switching valve is in the open position PA, the vacuum valve opening position PA and the suction / discharge switching valve opening position PB are connected in sequence.

[0023] The discharge pneumatic control valve assembly includes a pulse valve opening valve, a flow aid opening valve, and a discharge / suction switching valve.

[0024] Both the pulse valve opening valve and the flow aid opening valve have an opening position PA that is connected to the opening position PB of the foot valve opening / closing valve; wherein, the opening position PA of the pulse valve opening valve is used to control the opening of the pulse valve; the opening position PA of the flow aid opening valve is used to control the opening of the flow aid.

[0025] The feeding / discharging switching valve is a pneumatically controlled time-delay valve with a delayed open position PA. When triggered by the pneumatic signal of the open position PB of the bottom valve, the delayed open position PA can be connected to the closed position PA of the bottom valve for a delay.

[0026] The mechanical stop valve can trigger the material suction cycle pneumatic switching valve to switch from the open position PA to the closed position AR.

[0027] Both the mechanical open valve and the mechanical stop valve are two-position three-way mechanical valves, each with a trigger button, an open position PA, and a closed position AR. The trigger button is used to activate the open position PA of each valve, while the closed position AR is connected to the atmosphere.

[0028] The bottom valve is a two-position five-way dual pneumatic control valve, with a pneumatic control interface one adjacent to its own port A and a pneumatic control interface two adjacent to its own port B; wherein, the pneumatic control interface one is connected to port A of the mechanical opening valve; and the pneumatic control interface two is connected to port A of the suction and discharge switching valve.

[0029] A one-way valve is installed in the gas line connecting port A of the mechanical opening valve and the pneumatic control interface of the bottom valve opening and closing valve, so that gas can only flow in one direction from port A of the mechanical opening valve to the pneumatic control interface of the bottom valve opening and closing valve.

[0030] A throttle valve is also installed on the air circuit connecting the A port of the mechanical opening valve to the pneumatic control interface of the bottom valve opening and closing valve.

[0031] The vacuum valve opening valve is a two-position three-way single pneumatic control valve; the material suction circulation pneumatic control switching valve is a two-position three-way double pneumatic control valve, with a pneumatic control interface three adjacent to its own port A and a pneumatic control interface four opposite to its own port A; wherein, the pneumatic control interface three is connected to port A of the mechanical opening valve; and the pneumatic control interface four is connected to port A of the mechanical stop valve.

[0032] The suction and discharge switching valve is a two-position five-way single pneumatic delay valve; the pneumatic control interface of the suction and discharge switching valve is connected to port A of the suction circulation pneumatic control switching valve, so that the delayed closed position PA of the suction and discharge switching valve is turned on after a set suction delay time; the P port of the suction and discharge switching valve is connected to port A of the vacuum valve opening valve.

[0033] The pulse valve opening valve is a two-position three-way single pneumatic control valve; the pneumatic control interface of the pulse valve opening valve is connected to port B of the foot valve opening / closing valve; port A of the pulse valve opening valve is connected to the open position execution port of the pulse valve; port P of the pulse valve opening valve is connected to a high-pressure air source.

[0034] The flow aid opening valve is a two-position three-way single pneumatic control valve; the pneumatic control interface of the flow aid opening valve is connected to port B of the bottom valve opening / closing valve; port A of the flow aid opening valve is connected to the flow aid; port P of the flow aid opening valve is connected to a high-pressure air source.

[0035] The material discharge / suction switching valve is a two-position, two-way, single-pneumatically controlled, time-delayed valve; the pneumatic control interface of the material discharge / suction switching valve is connected to port B of the bottom valve's on / off valve; port A of the material discharge / suction switching valve is connected to the pneumatic control interface of the bottom valve's pneumatic valve; and port P of the material discharge / suction switching valve is connected to a high-pressure air source.

[0036] This utility model has the following beneficial effects:

[0037] 1. This application uses a mechanical valve to achieve one-button control of the pneumatic feeder's start and stop. The operation is simple, and the worker only needs to operate one button to complete all actions, reducing misoperation.

[0038] 2. This application uses a pneumatic control valve as the main component and a time-delay pneumatic control valve to achieve action time control and realize the logical interlock of each action. The entire process is without electrical involvement, which greatly improves safety in explosion-proof environments. In addition, the components are easy to obtain and there is no circuit connection or PLC control system, which reduces costs and engineering workload and improves stability. Attached Figure Description

[0039] Figure 1 The diagram shows the structure of a pneumatic control box for a pneumatic feeding machine according to this utility model.

[0040] Figure 2 A schematic diagram of the pneumatic feeder is shown.

[0041] Among them are:

[0042] 1. Throttling valve; 2. Bottom valve opening / closing valve; 3. Check valve; 4. Mechanical opening valve; 5. Suction circulation pneumatic control switching valve; 6. Mechanical stop valve; 7. Vacuum valve opening valve; 8. Suction / discharge switching valve; 9. Pulse valve opening valve; 10. Flow aid opening valve; 11. Suction / discharge switching valve;

[0043] 20. Pneumatic feeder; 21. Feeder body; 211. Storage chamber; 22. Suction pipe; 23. Filter media; 231. Pulse valve; 24. Vacuum generator; 241. Vacuum valve; 25. Bottom valve; 26. Flow aid; 27. High-pressure air source. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0045] In the description of this utility model, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this utility model. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the protection scope of this utility model.

[0046] like Figure 1 As shown, a pneumatic control box for a pneumatic feeder includes a high-pressure air source 27 and a mechanical opening valve 4, a mechanical stopping valve 6, a suction circulation pneumatic control valve assembly, and a suction circulation pneumatic control switching valve 5, all of which are connected to the high-pressure air source.

[0047] Both the mechanical opening valve and the mechanical stopping valve are preferably two-position three-way mechanical valves, each having a trigger button, an open position PA (i.e., its own P port and A port are connected, the same applies below, and will not be described again) and a closed position AR (i.e., its own A port and R port are connected, the same applies below, and will not be described again); wherein, the touch button is used to trigger the respective open position PA; the closed position AR is connected to the atmosphere.

[0048] The suction circulation pneumatic control valve assembly includes a suction pneumatic control valve group and a discharge pneumatic control valve group.

[0049] The material suction pneumatic control valve group includes a bottom valve opening and closing valve 2, a vacuum valve opening valve 7, and a material suction and discharge switching valve 8.

[0050] The bottom valve is a two-position five-way dual pneumatic control valve with two pneumatic control interfaces, a closed position PA and an open position PB (that is, its own P port and B port are connected, and the same applies below). Among them, the two pneumatic control interfaces are pneumatic control interface one adjacent to its own A port and pneumatic control interface two adjacent to its own B port. Pneumatic control interface one is connected to the A port of the mechanical opening valve; pneumatic control interface two is connected to the A port of the suction and discharge switching valve.

[0051] The closed position PA and open position PB of the foot valve are used to control the closing and opening of the foot valve, respectively.

[0052] Furthermore, a one-way valve 3 is preferably provided on the gas line connecting the A port of the mechanical opening valve and the pneumatic control interface of the bottom valve opening and closing valve, so that the gas can only flow unidirectionally from the A port of the mechanical opening valve to the pneumatic control interface of the bottom valve opening and closing valve.

[0053] Furthermore, a throttle valve 1 is preferably provided on the air circuit connecting the A port of the mechanical opening valve and the air control interface of the bottom valve opening and closing valve.

[0054] The preferred opening valve for the vacuum valve is a two-position three-way single-pneumatic control valve.

[0055] The preferred pneumatic switching valve for material suction circulation is a two-position three-way dual pneumatic control valve, which has a pneumatic control interface three adjacent to its own port A and a pneumatic control interface four opposite to its own port A; wherein, the pneumatic control interface three is connected to port A of the mechanical opening valve; and the pneumatic control interface four is connected to port A of the mechanical stopping valve.

[0056] Both the vacuum valve opening valve and the material suction circulation pneumatic control switching valve have an open position PA and a closed position AR that is connected to the atmosphere.

[0057] The suction / discharge switching valve is a pneumatically controlled time-delay valve, and more preferably a two-position five-way single pneumatically controlled time-delay valve, which has an open position PB and a delayed closed position PA.

[0058] The pneumatic control interface of the suction / discharge switching valve is connected to port A of the suction / discharge cycle pneumatic control switching valve, so that the delayed-closed position PA of the suction / discharge switching valve is turned on after a set suction delay time, thereby allowing the delayed-closed position PA of the suction / discharge switching valve to open the open position PB of the bottom valve after a delay; the P port of the suction / discharge switching valve is connected to port A of the vacuum valve opening valve, and the B port of the suction / discharge switching valve is connected to the vacuum valve to control the opening of the vacuum valve, thereby controlling the opening of the vacuum generator.

[0059] The discharge pneumatic control valve assembly includes a pulse valve opening valve 9, a flow aid opening valve 10, and a discharge / suction switching valve 11.

[0060] The pulse valve opening valve is a two-position three-way single pneumatic control valve; the pneumatic control interface of the pulse valve opening valve is connected to port B of the foot valve opening / closing valve; port A of the pulse valve opening valve is connected to the open position execution port of the pulse valve; port P of the pulse valve opening valve is connected to a high-pressure air source.

[0061] The flow aid opening valve is a two-position three-way single pneumatic control valve; the pneumatic control interface of the flow aid opening valve is connected to port B of the bottom valve opening / closing valve; port A of the flow aid opening valve is connected to the flow aid; port P of the flow aid opening valve is connected to a high-pressure air source.

[0062] Both the pulse valve opening valve and the flow aid opening valve have an opening position PA that is connected to the opening position PB of the foot valve opening / closing valve; wherein, the opening position PA of the pulse valve opening valve is used to control the opening of the pulse valve; the opening position PA of the flow aid opening valve is used to control the opening of the flow aid.

[0063] The feeding / discharging switching valve is a pneumatically controlled time-delay valve, preferably a two-position, two-way, single-pneumatically controlled time-delay valve with a delayed open position PA.

[0064] The pneumatic control interface of the feed / suction switching valve is connected to port B of the bottom valve opening / closing valve; port A of the feed / suction switching valve is connected to the pneumatic control interface of the bottom valve pneumatic valve; port P of the feed / suction switching valve is connected to a high-pressure air source. That is, the delayed-open position PA can be connected to the closed position PA of the bottom valve opening / closing valve after a delay when triggered by the pneumatic pressure signal of the open position PB of the bottom valve opening / closing valve.

[0065] The mechanical stop valve can trigger the material suction cycle pneumatic switching valve to switch from the open position PA to the closed position AR.

[0066] 1. Circulating suction and discharge: After pressing the trigger button of the mechanical open valve and releasing it, the pneumatic control box will automatically realize the circulation of suction and discharge.

[0067] 1. The material feeding process is as follows:

[0068] 1A. Bottom valve closed: Mechanically opening valve 4 puts bottom valve opening / closing valve 2 in the closed position PA, thereby closing the bottom valve. At this time, there is no air pressure at port B of the bottom valve opening / closing valve, so the pulse valve opening valve 9, the flow aid opening valve 10, and the feed / discharge switching valve 11 connected to it are all in the closed position, and thus the pulse valve and the flow aid stop working.

[0069] 1B. Material Suction: When the mechanical opening valve 4 closes the bottom valve 2 (PA), both port A of the material suction circulation pneumatic switching valve 5 and the material suction / discharge switching valve 8, which are connected to port A of the mechanical opening valve, simultaneously receive an airflow conduction signal and perform the following actions:

[0070] (1) Suction: The valve core of the suction circulation pneumatic switching valve 5 is immediately activated, and the suction circulation pneumatic switching valve is in the open position PA. The airflow flows downstream, which in turn drives the valve core of the vacuum valve opening valve 7 to be activated, so that the vacuum valve opening valve 7 is in the open position PA. The airflow continues to flow downstream and enters the P port of the suction and discharge switching valve 8, so that the suction and discharge switching valve is in the open position PB, and the vacuum valve is immediately opened. The vacuum generator is started, so that the storage chamber is in a vacuum negative pressure state. The powder enters the storage chamber through the suction pipe to realize the suction.

[0071] (2) Material suction and holding: The suction and discharge switching valve 8, which is connected to the mechanical opening valve A port, is a pneumatically controlled delay valve. Therefore, its valve core does not move temporarily and remains in the open position PB, that is, it maintains the material suction state.

[0072] 1C. Material Suction / Discharge Switching: After the set material suction delay time is reached, the valve core of the material suction / discharge switching valve 8, connected to port A of the mechanical opening valve, actuates, switching from port B to port A, thus reaching the delayed closed position PA. At the same time, the pressure at port B of the material suction / discharge switching valve is released, the vacuum valve closes, the vacuum generator stops working, the negative pressure in the storage chamber is released, and the material suction pipeline stops suctioning.

[0073] 1D. Discharge: The airflow at port A of the suction and discharge switching valve flows downstream, thereby driving port B of the bottom valve to open, driving the bottom valve to the open position PB, opening the bottom valve, and allowing the powder in the storage chamber to enter the feeding point through the bottom valve.

[0074] While the bottom valve opening / closing valve B is open, a portion of the airflow at the bottom valve opening / closing valve B simultaneously flows to the pulse valve opening valve 9, the flow aid opening valve 10, and the feed / discharge switching valve 11; wherein:

[0075] (1) The airflow to the pulse valve opening valve 9 will drive the pulse valve opening valve 9 to the open position PA, thereby opening the pulse valve. The pulse valve provides downward pulse backflush airflow to the top of the filter material, which can help the powder adhering to the filter material fall into the storage chamber below while also assisting in the discharge.

[0076] (2) The airflow to the flow aid opening valve 10 is in the open position PA, which causes the flow aid to open. The flow aid will vibrate the bottom of the feeder body to assist the material storage chamber in discharging.

[0077] (3) Since the feed switching valve 11 is a time-delay pneumatic control valve, the airflow flowing to the feed switching valve 11 will delay the action of the valve core driving the feed switching valve 11, and it will remain in the closed position.

[0078] 1E. Feeding and Discharging Switching: After the set feeding delay time is reached, the airflow flowing to the feeding and discharging switching valve 11 will drive the valve core of the feeding and discharging switching valve 11 to move, so that the airflow at port A of the feeding and discharging switching valve is open and flows downstream to the pneumatic control interface 1 of the bottom valve opening and closing valve, driving the open position PA to open, thereby starting a new round of feeding and discharging cycle.

[0079] 1F. Stop the suction / discharge cycle: After pressing and releasing the trigger button of the mechanical stop valve 6, the airflow at port A of the mechanical stop valve will flow downstream to the pneumatic control interface four of the suction cycle pneumatic control switching valve 5. At this time, the pneumatic control interface three of the suction cycle pneumatic control switching valve 5 is connected to the atmosphere through the mechanical opening valve 4. Therefore, the suction cycle pneumatic control switching valve 5 is activated, switching from the open position PA to the closed position AR. At this time, the vacuum opening valve 7 and the suction / discharge switching valve 8 will not receive pressure signals, and suction will stop.

[0080] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A pneumatic control box for a pneumatic feeder, characterized in that: It includes a high-pressure air source and mechanical opening valves, mechanical stopping valves, suction circulation air control valve assemblies, and suction circulation air control switching valves, all of which are connected to the high-pressure air source. The suction circulation pneumatic control valve assembly includes a suction pneumatic control valve group and a discharge pneumatic control valve group; The suction pneumatic control valve assembly includes a bottom valve opening and closing valve, a vacuum valve opening valve, and a suction / discharge switching valve; The foot valve has a closed position PA and an open position PB, which are used to control the closing and opening of the foot valve, respectively. Both the vacuum valve opening valve and the material suction circulation pneumatic control switching valve have an open position PA and a closed position AR that is connected to the atmosphere; The suction and discharge switching valve is a pneumatically controlled time-delay valve with an open position PB and a delayed closed position PA; wherein, the delayed closed position PA of the suction and discharge switching valve can delay the opening of the bottom valve opening and closing valve's open position PB. The mechanical opening valve can keep the bottom valve in the closed position PA and simultaneously keep the suction circulation pneumatic switching valve in the open position PA. When the suction circulation pneumatic control switching valve is in the open position PA, the vacuum valve opening position PA and the suction / discharge switching valve opening position PB are connected in sequence. The discharge pneumatic control valve assembly includes a pulse valve opening valve, a flow aid opening valve, and a discharge / suction switching valve; Both the pulse valve opening valve and the flow aid opening valve have an opening position PA that is connected to the open position PB of the bottom valve opening / closing valve; the opening position PA of the pulse valve opening valve is used to control the opening of the pulse valve; the opening position PA of the flow aid opening valve is used to control the opening of the flow aid; the feed / discharge switching valve is a pneumatically controlled time-delay valve with a time-delayed opening position PA; the time-delayed opening position PA can be connected to the closed position PA of the bottom valve opening / closing valve for a delay when triggered by the pneumatic pressure signal of the open position PB of the bottom valve opening / closing valve. The mechanical stop valve can trigger the material suction cycle pneumatic switching valve to switch from the open position PA to the closed position AR.

2. The pneumatic control box for a pneumatic feeder according to claim 1, characterized in that: Both the mechanical open valve and the mechanical stop valve are two-position three-way mechanical valves, each with a trigger button, an open position PA, and a closed position AR. The trigger button is used to activate the open position PA of each valve, while the closed position AR is connected to the atmosphere.

3. The pneumatic control box for a pneumatic feeder according to claim 1 or 2, characterized in that: The bottom valve is a two-position five-way dual pneumatic control valve, with a pneumatic control interface one adjacent to its own port A and a pneumatic control interface two adjacent to its own port B; wherein, the pneumatic control interface one is connected to port A of the mechanical opening valve; and the pneumatic control interface two is connected to port A of the suction and discharge switching valve.

4. The pneumatic control box for a pneumatic feeder according to claim 3, characterized in that: A one-way valve is installed in the gas line connecting port A of the mechanical opening valve and the pneumatic control interface of the bottom valve opening and closing valve, so that gas can only flow in one direction from port A of the mechanical opening valve to the pneumatic control interface of the bottom valve opening and closing valve.

5. The pneumatic control box for a pneumatic feeder according to claim 3, characterized in that: A throttle valve is also installed on the air circuit connecting the A port of the mechanical opening valve to the pneumatic control interface of the bottom valve opening and closing valve.

6. The pneumatic control box for a pneumatic feeder according to claim 1, characterized in that: The vacuum valve opening valve is a two-position three-way single pneumatic control valve; the material suction circulation pneumatic control switching valve is a two-position three-way double pneumatic control valve, with a pneumatic control interface three adjacent to its own port A and a pneumatic control interface four opposite to its own port A; wherein, the pneumatic control interface three is connected to port A of the mechanical opening valve; and the pneumatic control interface four is connected to port A of the mechanical stop valve.

7. The pneumatic control box for a pneumatic feeder according to claim 6, characterized in that: The suction and discharge switching valve is a two-position five-way single pneumatic delay valve; the pneumatic control interface of the suction and discharge switching valve is connected to port A of the suction circulation pneumatic control switching valve, so that the delayed closed position PA of the suction and discharge switching valve is turned on after a set suction delay time; the P port of the suction and discharge switching valve is connected to port A of the vacuum valve opening valve.

8. The pneumatic control box for a pneumatic feeder according to claim 3, characterized in that: The pulse valve opening valve is a two-position three-way single pneumatic control valve; the pneumatic control interface of the pulse valve opening valve is connected to port B of the foot valve opening / closing valve; port A of the pulse valve opening valve is connected to the open position execution port of the pulse valve; port P of the pulse valve opening valve is connected to a high-pressure air source.

9. The pneumatic control box for a pneumatic feeder according to claim 3, characterized in that: The flow aid opening valve is a two-position three-way single pneumatic control valve; the pneumatic control interface of the flow aid opening valve is connected to port B of the bottom valve opening / closing valve; port A of the flow aid opening valve is connected to the flow aid; port P of the flow aid opening valve is connected to a high-pressure air source.

10. The pneumatic control box for a pneumatic feeder according to claim 3, characterized in that: The material discharge / suction switching valve is a two-position, two-way, single-pneumatically controlled, time-delayed valve; the pneumatic control interface of the material discharge / suction switching valve is connected to port B of the bottom valve's on / off valve; port A of the material discharge / suction switching valve is connected to the pneumatic control interface of the bottom valve's pneumatic valve; and port P of the material discharge / suction switching valve is connected to a high-pressure air source.

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