Pneumatic conveying feeding device with automatic pressure control valve

Abstract

A pneumatic conveying feeding device with an automatic pressure control valve comprises a stock bin, the stock bin is connected with a feeder, the feeder is connected with a conveying pipe, one end of the conveying pipe is connected with a pressure generating device, and the other end of the conveying pipe is connected with a feeding valve. Wherein the conveying pipe is provided and communicated with an automatic pressure control valve, the automatic pressure control valve is provided with a control part, a first valve body and a sensing part which are electrically connected, and the sensing part is used for detecting a pressure value in a pipeline of the conveying pipe and transmitting obtained data to the control part; the first valve body is arranged in the conveying pipeline and driven by the control part to be opened to release air pressure outwards or lock air in the conveying pipeline to increase the pressure in the conveying pipeline.

Description

Technical Field

[0001] The present invention is a pneumatic conveying feeding device with an automatic pressure control valve, and particularly relates to an active induction pressurized air supply and active pressure reducing valve structure added to the pneumatic conveying feeding device. The device is designed to achieve smooth operation and power saving effects through a special control method. Background Art

[0002] Please refer to Figure 1 The conventional existing pneumatic conveying feeding device shown is a PVC powder feeding device, and its general principle is: the device is a device that uses compressed air as a power to transport solid particles through a sealed pipe; the device usually includes five parts: an air source, a transmitter, a pipeline, a control and a silo, and has the advantages of high conveying capacity, small pipeline wear, long conveying distance, low energy consumption, no pollution and high degree of automation.

[0003] Please refer to Figure 1 The configuration diagram of the existing pneumatic conveying feeding device shown in the figure takes one type of traditional pressure-feeding pneumatic conveying design as an example. Its operating principle is mainly to have a silo 1 for placing raw materials, and a feeder 2 is connected below the silo 1. In addition to the function of releasing raw materials, the feeder 2 can further have homogenizing functions such as pressurization or filtering. A conveying pipe 4 is connected below the feeder 2, and one end of the conveying pipe 4 is connected to a blower 3. The other end of the conveying pipe 4 connected to the blower 3 is connected to a feed valve 5, and the feed valve 5 is further connected to one or more storage bins 6, and the storage bin 6 receives the raw materials conveyed from the silo 1.

[0004] The operating principle of the existing pneumatic conveying feeding device is that when the blower 3 is started, the pressure generating device of the blower 3 delivers relatively high-pressure air to the conveying pipe 4, further causing a pressure difference to be generated at the position of the feeder 2 connected to the pipeline of the conveying pipe 4, and the raw materials sucked into the feeder 2 are blown toward the feed valve 5, and then further stored in the storage bin 6 connected to the feed valve 5, thereby achieving the technical effect of conveying the raw materials to another distance for subsequent production operations; in addition, in addition to the type in which the blower outputs air pressure from a section, this type of pneumatic conveying feeding device can also be a suction-type design in which air is sucked in the opposite direction to the position of the feeder 2 connected to the pipeline of the conveying pipe 4 to generate a pressure difference, and the raw materials sucked into the feeder 2 are blown toward the feed valve 5, in which it is particularly emphasized that the feed valve 5 is mainly used to control the inflow and outflow of raw materials, and in principle does not control the pressure of the conveying pipe 4, and the traditional design is an independently operated and controlled structure.

[0005] Please refer to Figure 2The pressure flow meter of the existing pneumatic conveying feeding device shown in the figure has some technical problems in operation during the operation of the pneumatic conveying feeding device, whether it is a pressure-feeding type or a suction-feeding type. That is, when the blower 3 is started, the feed valve 5 is often fully opened, resulting in a lack of external air pressure in the connected conveying pipe 4. At this time, after the blower 3 is started, the pressure in the conveying pipe 4 is too low and continuously leaks out, and it cannot be smoothly operated. When this situation occurs, it is particularly necessary to close the feed valve 5 so that the conveying pipe 4 is pressurized by the air blown by the blower 3, so that the pressure in the conveying pipe 4 rises to a certain pressure, so that the blower 3 can operate smoothly after starting.

[0006] Another disadvantage is that when the blower 3 is operated after starting, the internal air pressure in the delivery pipe 4 may increase due to the continuous air supply of the blower 3. If the pressure is not relieved, the pressure in the delivery pipe 4 will be reversed, causing the blower 3 to surge and jump due to the excessive reverse pressure, resulting in an emergency shutdown. Since the feed valve 5 must be controlled individually and is not used to adjust the pressure in the delivery pipe 4, if the pressure is not relieved, the pressure in the delivery pipe 4 will be reversed, causing the blower 3 to surge and jump due to the excessive reverse pressure, resulting in an emergency shutdown. Figure 2 The operation curve diagram of the pneumatic conveying feeding device shown in the figure is marked with a thrust line (overheat line) PL, a surge line PH and a surge warning line PA. The thrust line (overheat line) PL, the surge line PH and the surge warning line PA have different data according to the specifications of each pneumatic conveying feeding device. The thrust line (overheat line) PL is a limit value curve representing that the pressure in the pipeline of the conveying pipe 4 is too low. When the thrust line (overheat line) PL is lower than the thrust line (overheat line) PL, the blower 3 cannot operate after starting due to too low pressure, or after operation, the blower 3 senses and accelerates the fan to run at an excessively high speed due to too low pressure, resulting in overheating and damage. The surge line PH represents the limit value curve of the pressure in the pipeline of the conveying pipe 4 is too high. If the curve value is exceeded, The surge warning line PA is a warning curve below the surge line PH. When the pressure in the delivery pipe 4 is higher than the surge warning line PA, the pressure should be adjusted to avoid the blower 3 from surging and shutting down. The loss caused by shutdown during operation is greater than the failure to start, and it will occur in a shorter time than overheating. Therefore, a surge warning line PA is set as a control standard. The uneven feed rate will also cause the air pressure in the delivery pipe 4 to change continuously during operation. In order to avoid the aforementioned loss of pressure or surge jump, the general industry must pay attention to the change of air pressure value in a time-consuming manner. In addition, the traditional design control cannot be timely. Therefore, in order to ensure the safety of operation, the existing device controls more than Figure 2 Controlling the pipeline air pressure within a small range of values ​​within the arrows indicating high pressure P1 and low pressure P2 results in considerable loss of manpower costs in control and poor operating stability. Summary of the invention

[0007] The present invention is a pneumatic conveying feeding device with an automatic pressure control valve, comprising a silo, the silo is connected to a feeder, the feeder is connected to a conveying pipe, one end of the conveying pipe is connected to a pressure generating device, the other end of the conveying pipe connected to the pressure generating device is connected to a feeding valve, and the characteristic is that the conveying pipe is arranged to be connected to an automatic pressure control valve, the automatic pressure control valve is provided with a control part, a first valve body and a sensing part and is electrically connected, the sensing part detects the internal pressure value of the conveying pipe pipeline and transmits the obtained data to the control part, the first valve body is arranged in the conveying pipe pipeline and is driven by the control part to open and release air pressure outward, or lock the air in the conveying pipe pipeline to increase the pressure in the conveying pipe pipeline.

[0008] Another technical feature of the present invention is that its control method is characterized in that when the pneumatic conveying feeding device starts the blower to operate, the automatic pressure control valve senses the pressure in the conveying pipe through the sensing part. If it is detected that the pressure in the conveying pipe is as low as close to the thrust line, the automatic pressure control valve will drive the first valve body arranged in the conveying pipe to perform a locking action. When the pressure in the conveying pipe rises and approaches the surge line, the automatic pressure control valve will drive the first valve body arranged in the conveying pipe to open and release pressure to the outside, so that the conveying pipe is depressurized to the normal pressure value and then the first valve body is closed to open and release pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 : It is the configuration diagram of the existing pneumatic conveying feeding device;

[0010] Figure 2 : It is the pressure flow meter of the existing pneumatic conveying feeding device;

[0011] Figure 3 : is a configuration diagram of a pneumatic conveying feeding device with an automatic pressure control valve according to a preferred embodiment of the present invention;

[0012] Figure 4 : is a distribution diagram of an automatic pressure control valve unit of a pneumatic conveying feeding device with an automatic pressure control valve according to a preferred embodiment of the present invention;

[0013] Figure 5 : It is a pressure flow meter of a pneumatic conveying feeding device with an automatic pressure automatic pressure control valve of the present invention;

[0014] Figure 6 : is a configuration diagram of a pneumatic conveying feeding device with an automatic pressure control valve in another preferred embodiment of the present invention.

[0015] Description of reference numerals:

[0016] 1: Silo

[0017] 2: Feeder

[0018] 3: Blower

[0019] 4: Delivery pipe

[0020] 5: Feed valve

[0021] 6: Storage silo

[0022] 7: Automatic pressure control valve

[0023] 71: Control Department

[0024] 72a: First valve body

[0025] 72b: Second valve body

[0026] 73: Induction Department

[0027] P1: High voltage

[0028] P2: Low pressure

[0029] PA: Surge warning line

[0030] PH: Surge Line

[0031] PL: Thrust line (overheating line) DETAILED DESCRIPTION

[0032] Please refer to Figure 3 The preferred embodiment of the present invention is shown in the figure of the pneumatic conveying feeding device with automatic pressure control valve, and Figure 4The preferred embodiment of the present invention is shown in the distribution diagram of the automatic pressure control valve unit of the pneumatic conveying feeding device with an automatic pressure control valve. In order to solve the problem that the pressure generating device of the blower 3 or the suction structure in the existing pneumatic conveying feeding device is shut down due to surging or too low internal pressure in the pipeline of the conveying pipe 4, or cannot operate or overheat after starting, etc., and to increase the accuracy of operation control and reduce loss cost, the technical feature of the present invention is that an automatic pressure control valve 7 is set in the pipeline of the conveying pipe 4 of the pneumatic conveying feeding device, and the automatic pressure control valve 7 is connected and arranged on the pipeline of the conveying pipe 4 for communication, wherein the automatic pressure control valve 7 is provided with three main units including a control part 71, a first valve body 72a and a sensing part 73 and is electrically connected, and the sensing part 73 is connected to and detects the internal pressure value of the pipeline of the conveying pipe 4 and The detected data is transmitted to the control unit 71. The first valve body 72a is arranged in the pipeline of the delivery pipe 4 and is driven by the control unit 71 to open and release pressure to the outside or lock the gas in the pipeline of the delivery pipe 4, thereby controlling and adjusting the pressure in the pipeline of the delivery pipe 4. The control unit 71 can preset the built-in pressure control values ​​such as the thrust line (overheating line) PL, surge line PH and surge warning line PA in its control circuit according to the output specifications of the corresponding installed pneumatic conveying feeding device, and receive the pressure data sensed by the sensing unit 73 from the pipeline of the delivery pipe 4 for calculation, and then form a control signal to drive the first valve body 72a to open and release pressure to the outside or lock it to control the gas flow of the pipeline of the delivery pipe 4, so that the pipeline pressure of the delivery pipe 4 can keep the blower 3 running at a safe pressure value within the range of the thrust line (overheating line) PL to the surge line PH for a long time.

[0033] Please refer to Figure 5The pressure flow meter of the pneumatic conveying feeding device with automatic pressure control valve of the present invention is shown. When the pneumatic conveying feeding device starts the blower 3, the automatic pressure control valve 7 senses the pressure in the pipeline of the conveying pipe 4 through the sensing part 73. If it is detected that the pressure in the pipeline of the sensing conveying pipe 4 is low and close to the thrust line (overheating line) PL, the automatic pressure control valve 7 will drive the first valve body 72a arranged in the pipeline of the conveying pipe 4 to perform a locking action. At this time, after the blower 3 starts to run, the pressure in the pipeline of the conveying pipe 4 will be quickly increased to a level higher than the thrust line (overheating line) PL, so that after the blower 3 starts to run, it will not be unable to run smoothly due to insufficient pressure or the pressure after running is too low, causing the blower 3 to over-speed the blades and overheat. Further, when the pneumatic conveying feeding device starts to deliver During the material feeding process, if the pressure in the pipeline of the delivery pipe 4 rises and approaches the surge line PH, the automatic pressure control valve 7 will drive the first valve body 72a arranged in the pipeline of the delivery pipe 4 to open and release the pressure outward, so that the pipeline of the delivery pipe 4 is depressurized to a normal pressure value, and then the first valve body 72a is closed to release the pressure. At this time, the blower 3 starts to operate without generating reverse pressure on the blades of the blower 3 due to excessive pressure in the pipeline of the delivery pipe 4, thereby causing surge shutdown. Since the automatic pressure control valve 7 can drive the first valve body 72a arranged in the pipeline of the delivery pipe 4 to open and release the pressure outward or lock it at any time based on the changes of the sensing part 73, it controls it within a certain pressure range, thereby avoiding the blades of the blower 3 from encountering reverse pressure resistance or excessive speed. Figure 5 By controlling the pipeline air pressure within the range of values ​​close to the arrows indicating high pressure P1 and low pressure P2, a considerable amount of electricity can be saved and the cost of control operation can be reduced.

[0034] Please refer to Figure 6Another preferred embodiment of the present invention is shown in the figure of the pneumatic conveying feeding device with automatic pressure control valve. When the delivery pipe 4 of the pneumatic conveying feeding device is relatively long, the automatic pressure control valve 7 can further increase the second valve body 72b in the delivery pipe 4 near the position of the blower 3 and electrically connect the control unit 71, and the control unit 71 drives the delivery pipe 4 to lock the pipeline, while the original first valve body 72a is set in the delivery pipe 4 near the feed valve 5, and is driven by the control unit 71 to open and release pressure to the outside. The control method is that when the pneumatic conveying feeding device starts the feeding process When the pneumatic conveying feeding device starts the blower 3, the automatic pressure control valve 7 senses the pressure in the conveying pipe 4 through the sensing part 73. If it is detected that the pressure in the conveying pipe 4 is low and close to the thrust line (overheating line) PL, the automatic pressure control valve 7 will drive the second valve body 72b arranged in the conveying pipe 4 to perform a locking action. At this time, after the blower 3 starts to run, the pressure in the conveying pipe 4 will be quickly increased to a level higher than the thrust line (overheating line) PL, so that after the blower 3 starts to run, it will not be unable to run smoothly due to insufficient pressure or the pressure is too low after running, causing the blower 3 to rotate the blades at an overspeed. Overheating, and then open the second valve body 72b after the blower 3 starts running smoothly. Since the second valve body 72b is set closer to the blower 3, the pressure in the pipeline of the delivery pipe 4 can be increased more quickly to reach the pressure required for the operation of the blower 3, and then resume opening to conduct airflow after the blower 3 is running; when the pneumatic feeding device starts feeding, if the pressure in the pipeline of the delivery pipe 4 rises close to the surge line PH, the automatic pressure control valve 7 will drive the first valve body 72a set in the pipeline of the delivery pipe 4 to open and release the pressure outward, so that the pipeline of the delivery pipe 4 is depressurized to the normal pressure value, and then close the first valve body 72 a is opened outwards, at this time, when the blower 3 starts to run, there will be no reverse pressure on the blades of the blower 3 due to excessive pressure in the delivery pipe 4, and the first valve body 72a is arranged close to the feed valve 5, which can make the pressure release to the outside more efficient, and has a better technical effect of avoiding the occurrence of surge shutdown. Since the automatic pressure control valve 7 can sense the change of air pressure based on the sensing part 73 and then drive the first valve body 72a arranged on the delivery pipe 4 to release pressure to the outside or the second valve body 72b to lock at any time to control it within a certain pressure range, thereby avoiding the blower 3 blades from encountering reverse pressure resistance or excessive speed, it can be as shown in the figure. Figure 5 The pipeline air pressure is controlled within the range of values ​​close to the arrows indicating high pressure P1 and low pressure P2.

Claims

1. A pneumatic conveying feeding device with an automatic pressure control valve, mainly comprising a silo (1), the silo (1) is connected to a feeder (2), the feeder (2) is connected to a delivery pipe (4), one end of the delivery pipe (4) is connected to a pneumatic conveying pressure generating device, the other end of the delivery pipe (4) connected to the pressure generating device is connected to a feed valve (5), the pressure generating device delivers relatively high pressure air to the delivery pipe (4), so that a pressure difference is generated at the position of the feeder (2) connected to the delivery pipe (4), and the raw materials sucked into the feeder (2) are blown toward the feed valve (5); characterized in that The delivery pipe (4) is provided to be connected to an automatic pressure control valve (7). The automatic pressure control valve (7) is provided with a control unit (71), a first valve body (72a) and a sensing unit (73) and is electrically connected. The sensing unit (73) detects the internal pressure value of the pipeline of the delivery pipe (4) and transmits the obtained data to the control unit (71). The first valve body (72a) is provided in the pipeline of the delivery pipe (4) and is driven by the control unit (71) to open to release air pressure to the outside, or to lock the air in the pipeline of the delivery pipe (4) to increase the pressure in the pipeline of the delivery pipe (4).

2. A pneumatic conveying feeding device with an automatic pressure control valve as described in claim 1, wherein the control unit (71) of the automatic pressure control valve (7) is additionally provided with a second valve body (72b) in the conveying pipe (4) at the position of the blower (3) and is electrically connected to the control unit (71).

3. The pneumatic conveying feeding device with an automatic pressure control valve as claimed in claim 1, wherein the pressure generating device is a blower (3) or a suction device.

4. The pneumatic conveying feeding device with an automatic pressure control valve as claimed in claim 1, wherein the feeding valve (5) is further connected to one or more storage bins (6).

5. A control method for a pneumatic feeding device with an automatic pressure control valve, the pneumatic feeding device comprising a silo (1), the silo (1) being connected to a feeder (2), the feeder (2) being connected to a delivery pipe (4), one end of the delivery pipe (4) being connected to a pressure generating device, the other end of the delivery pipe (4) being connected to the pressure generating device being connected to a feeding valve (5), the delivery pipe (4) being arranged to be connected to an automatic pressure control valve (7), the automatic pressure control valve (7) being provided with a control unit (71), a first valve body (72a) and a sensing unit (73) and being electrically connected, the pneumatic delivery pressure generating device delivering relatively high pressure air to the delivery pipe (4), so that a pressure difference is generated at the position of the feeder (2) connected to the delivery pipe (4) so ​​as to inhale the feeder (5). The raw material in the feed container (2) is blown toward the feed valve (5), and the control method is characterized in that when the pneumatic feeding device starts the pressure generating device, the automatic pressure control valve (7) senses the pressure in the pipeline of the delivery pipe (4) through the sensing part (73). If it is detected that the pressure in the pipeline of the delivery pipe (4) is low and close to the thrust line (PL), the automatic pressure control valve (7) will drive the first valve body (72a) arranged in the pipeline of the delivery pipe (4) to perform a locking action. When the pressure in the pipeline of the delivery pipe (4) rises and approaches the surge line (PH), the automatic pressure control valve (7) will drive the first valve body (72a) arranged in the pipeline of the delivery pipe (4) to open and release pressure to the outside, so that the pipeline of the delivery pipe (4) is released to a normal pressure value, and then the first valve body (72a) is closed to open and release pressure.

6. A control method for a pneumatic feeding device with an automatic pressure control valve, the pneumatic feeding device comprising a silo (1), the silo (1) being connected to a feeder (2), the feeder (2) being connected to a delivery pipe (4), one end of the delivery pipe (4) being connected to a pneumatic pressure generating device, the other end of the delivery pipe (4) being connected to the pressure generating device is connected to a feeding valve (5), the automatic pressure control valve (7) being provided with a control unit (71), a first valve body (72a), a second valve body (72b) and a sensing unit (73) and being electrically connected, the pressure generating device delivering relatively high pressure air to the delivery pipe (4), so that a pressure difference is generated at the position of the feeder (2) connected to the delivery pipe (4), and the raw materials sucked into the feeder (2) are blown toward the feeding valve (5) The control method is characterized in that when the pneumatic conveying feeding device starts the operation of the pressure generating device, the automatic pressure control valve (7) senses the pressure in the pipeline of the conveying pipe (4) through the sensing part (73). If it is detected that the pressure in the pipeline of the conveying pipe (4) is low and close to the thrust line (PL), the automatic pressure control valve (7) will drive the second valve body (72b) arranged in the pipeline of the conveying pipe (4) to perform a locking action, and then open the second valve body (72b) after the pressure generating device starts to operate smoothly. If the pressure in the pipeline of the conveying pipe (4) rises and approaches the surge line (PH), the automatic pressure control valve (7) will drive the first valve body (72a) arranged in the pipeline of the conveying pipe (4) to open and release the pressure outward, so that the pipeline of the conveying pipe (4) is released to the normal pressure value, and then the first valve body (72a) is closed and opened outward.

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