Pulse jet control device and method for baghouse

Abstract

The application discloses a kind of bag type dust collector pulse injection control device and method, belong to bag type dust collector technical field, including box, dust collector bag is installed in the box, the lower part of the box is provided with solenoid valve group, the lower part of the solenoid valve group is provided with pulse injection control box, and the side of the pulse injection control box is provided with electrical terminal tapping box;The output point of the pulse injection control box is connected with solenoid valve group, multiple output points are provided in pulse injection control box, and the solenoid valve group includes multiple solenoid valves, and every two solenoid valves are connected with an output point;Expansion module is arranged on the line connected between solenoid valve group and pulse injection control box, expansion module is connected with intermediate relay, one end of solenoid valve is connected with one end of intermediate relay, and multiple intermediate relays are arranged, and one intermediate relay is connected with multiple solenoid valves.Can effectively reduce the pressure fluctuation amplitude generated by dust collector pulse injection, reduce the consumption of compressed air, reduce the empty head of cigarette and waste cigarette rate.

Description

A pulse jet cleaning control device and method for a bag filter Technical Field

[0001] This invention belongs to the technical field of baghouse dust collectors, specifically relating to a pulse jet cleaning control device and method for baghouse dust collectors. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Currently, most cigarette factories use centralized airflow and dust removal systems for their cigarette-making machines. The vast majority of these dust removal systems employ modular flat bag dust collectors. The cleaning of these flat bag dust collectors is achieved using pulse-jet compressed air, referred to as a pulse-jet cleaning system. As shown in Figure 4, the principle involves cyclically controlling the opening and closing times of multiple solenoid valves, causing them to open sequentially for a time interval t1 and t2, creating a periodic pulse. The pulse-jet releases compressed air into the filter bag, causing it to expand and deform, dislodging the dust adhering to the bag. The released compressed air enters the dust collector chamber, acting like a positive pressure jet impacting a stable negative pressure airflow. This jet disturbance causes a momentary drop in negative pressure, similar to a vibration wave. This vibration wave is rapidly transmitted through the air in the pipes to the cigarette machine's air chamber, where it is displayed on the pressure gauge.

[0004] During the operation of the centralized process ventilation system, the process air pressure exhibits periodic fluctuations of varying amplitudes. Testing and analysis revealed that the pulse cycle time t1 + t2 = 12 seconds, perfectly matching the periodic fluctuations in process air pressure. The amplitude of the vibration wave affecting the pressure fluctuations in the cigarette machine's air chamber depends on the compressed air flow rate and pressure, the length of the dust collection pipeline, and the number of bends in the pipeline. Higher compressed air flow rate and pressure result in a greater impact, and vice versa; shorter pipeline lengths have a greater impact, and vice versa; fewer pipeline bends result in a greater impact, and vice versa.

[0005] The fluctuation value of negative pressure in the centralized cigarette-making process and the stability of the wind system are closely related to cigarette quality and cigarette rolling quality. Currently, maintaining a good dust removal effect requires a large compressed air flow rate, but a large flow rate of compressed air leads to a larger pressure fluctuation, which increases energy consumption and production costs. Furthermore, large pressure fluctuations can lead to a higher rate of empty cigarette ends and waste smoke, which is detrimental to actual production. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a pulse jet cleaning control device and method for baghouse dust collectors, which can effectively reduce the pressure fluctuation amplitude generated by pulse jet cleaning of dust collectors, reduce compressed air consumption, and reduce empty cigarette heads and waste smoke rate.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A pulse jet cleaning control device and method for a bag filter includes a housing, in which a dust collector filter bag is installed. A solenoid valve group is arranged in two rows at the bottom of the housing. A pulse jet cleaning control box is arranged at the bottom of the solenoid valve group. An electrical terminal distribution box is arranged on one side of the pulse jet cleaning control box.

[0009] The output point of the pulse jet control box is connected to the solenoid valve group. The pulse jet control box is provided with multiple output points. The solenoid valve group includes multiple solenoid valves, and every two solenoid valves are connected to one output point.

[0010] An expansion module is installed on the line connecting the solenoid valve group and the pulse jet control box. The expansion module is connected to an intermediate relay. One end of the solenoid valve is connected to one end of the intermediate relay. Multiple intermediate relays are provided, and one intermediate relay is connected to multiple solenoid valves.

[0011] Furthermore, the normally open and normally closed contacts of the intermediate relay are connected in series with the coil of the solenoid valve, and the intermediate relay is electrically connected to the expansion module, which is used to control the on / off state of the intermediate relay.

[0012] Furthermore, an electrical terminal junction box is provided between the pulse control box and the solenoid valve assembly, and the electrical terminal junction box is used to connect the pulse control box and the solenoid valve assembly.

[0013] Furthermore, the electrical terminal box is provided with multiple terminals, and the intermediate relay is provided with normally open contacts and normally closed contacts.

[0014] Furthermore, the normally open contact of the intermediate relay is connected to the output point of part of the pulse jet control box and the terminal connection circuit of part of the electrical terminal junction box.

[0015] Furthermore, the normally closed contact of the intermediate relay is connected to the circuit where the output point of another part of the pulse jet control box and the terminals of another part of the electrical terminal junction box are connected.

[0016] Furthermore, the pulse jet control box is electrically connected to a high-voltage power supply, and one end of the solenoid valve assembly is electrically connected to the high-voltage power supply.

[0017] Furthermore, an ash hopper is provided at the bottom of the box, and the ash hopper is fixedly connected to the box.

[0018] Furthermore, a dust collector bracket is provided at the lower part of the housing, and the dust collector bracket is fixedly connected to the housing.

[0019] A control method for a pulse jet cleaning control device for a bag filter includes the following steps: a high-voltage power supply powers the dust collector pulse control box; after power-on, the dust collector pulse control box transmits current to intermediate relays through lines; each intermediate relay controls the on / off state of multiple solenoid valves; according to the control program written in the expansion module, the multiple intermediate relays are controlled to periodically switch on and off, thereby achieving independent control of the pulse signal on / off state of each column, so that the solenoid valves with the same sequence number in these two columns do not work simultaneously, reducing the compressed air flow by half each time the dust is cleaned by pulse jet cleaning, thereby reducing the impact of pulse jet cleaning on pressure fluctuations.

[0020] Compared with the prior art, the advantages and positive effects of this invention are:

[0021] This invention involves installing multiple intermediate relays and appropriate terminals within the electrical box of the solenoid valves in two columns of a dust collector. The normally open / normally closed contacts of the intermediate relays are connected in series between the pulse signal line and the solenoid valve coil. An expansion module is added to the dust collector's pulse control box. Through a PLC timer program, the intermediate relays KA1-KA3 are periodically controlled to switch on and off once using a 10x pulse (t1+t2). This allows for independent control of the pulse signal on / off of each column, preventing the solenoid valves with the same sequence number from operating simultaneously. This reduces the compressed air flow by half during each pulse-jet cleaning, thereby minimizing the impact of pulse-jet cleaning on pressure fluctuations, keeping the pipeline pressure fluctuation within 200Pa.

[0022] The pulse jet control box controls the opening and closing of the solenoid valve assembly. An expansion module and intermediate relays are installed between the control box and the assembly. The expansion module allows for setting the on / off state of the intermediate relays, enabling the solenoid valves to open and close at different times, thus achieving time-sharing pulse jet cleaning. Furthermore, the expansion module can be programmed to adjust the jet sequence, improving applicability and reducing compressed air consumption. This time-sharing method reduces the compressed air flow by half during each pulse jet cleaning cycle, thereby reducing pressure fluctuations caused by pulse jet cleaning, improving cigarette qualification rates, saving energy, and achieving cost reduction and efficiency improvement for enterprises. Attached Figure Description

[0023] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0024] Figure 1 is a schematic diagram of the structure of the pulse jet control device for the bag filter of the present invention.

[0025] Figure 2 is a circuit diagram of the pulse jet control box of the present invention;

[0026] Figure 3 is a circuit diagram of the extension module of the present invention;

[0027] Figure 4 is a timing diagram of periodic pulses;

[0028] In the diagram: 1. Housing; 2. Solenoid valve assembly; 3. Pulse jet control box; 4. Electrical terminal junction box; 5. Dust hopper; 6. Dust collector support. Detailed Implementation

[0029] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0030] The existing technology is as follows: The dust collector selected for the centralized process airflow and dust removal system of the coiling unit is a 2-row, 5-layer model, namely DLMC2 / 5 / 15, as shown in Figure 1. The 2-row dust collector is equipped with 20 solenoid valves; in effect, 10 DO points control 20 solenoid valves, meaning 1 DO point controls 2 solenoid valves. Each dust collector is equipped with one pulse jet controller, as shown in Figure 2. The pulse jet controller is connected to the pulse jet solenoid valves on the dust collector via control cables. Every two solenoid valves with the same serial number in the 2-row dust collector are grouped together and controlled by one DO point, operating simultaneously. The compressed air flow rate injected into the dust collector is twice that of a single-row dust collector. Due to the influence of pulse jet cleaning, the pipeline pressure fluctuation is approximately 400-500 Pa.

[0031] Analysis of the principle of the impact of pulse jet cleaning of dust collector on the process air pressure fluctuation of cigarette machine: Most dust collectors used in centralized process air power systems are 2-3 rows, with 10 solenoid valves in each row. The entire dust collector with 20 or 30 solenoid valves is controlled by a pulse controller A1 (10 digital output points), that is, each digital output point controls 2 or 3 solenoid valves to spray at the same time.

[0032] When the solenoid valve opens the blower bag, the released compressed air enters the dust collector chamber, much like a positive pressure jet impacting a stable static pressure box. This jet disturbance causes a momentary drop in negative pressure, acting like a vibration wave. This vibration wave is rapidly transmitted through the air in the pipes to the VE air chamber of the cigarette machine, which can be detected by a pressure sensor or displayed on a pressure gauge in the air chamber. When the working pressure of the cigarette machine's air chamber is -10000Pa, the pressure fluctuation is approximately 400-500Pa. Therefore, it is evident that the negative pressure fluctuation value of the centralized cigarette-making process and the stability of the air system are closely related to cigarette quality and cigarette rolling quality.

[0033] The present invention will be described in detail below with reference to the accompanying drawings. The present embodiment discloses a pulse jet cleaning control device and method for a bag filter, as shown in Figure 1. It includes a housing 1, in which a dust collector bag is installed. A solenoid valve group 2 is provided at the lower part of the housing 1, and a pulse jet cleaning control box 3 is provided at the lower part of the solenoid valve group 2. An electrical terminal junction box 4 is provided on one side of the pulse jet cleaning control box 3.

[0034] A dust hopper 5 is installed at the bottom of the housing 1, and the dust hopper 5 is fixedly connected to the housing 1. A dust collector support 6 is installed at the lower part of the housing 1, and the dust collector support 6 is fixedly connected to the housing 1. As shown in Figure 1, this dust collector is a flat bag dust collector with two rows and four layers. The housing 1 is equipped with dust collection bags; the solenoid valve group 2 is a group of 10 pulse jet solenoid valves; the pulse jet control box 3 is equipped with a controller, intermediate relays, and wiring terminals; the electrical terminal distribution box 4 is used to connect the pulse jet control box 3 and the solenoid valve group 2, and contains wiring terminals; the dust hopper 5 is used to collect the dust shaken off by the pulse jet bags; the dust collector support 6 provides support and ensures the stability of the dust collector during operation.

[0035] The output point of the pulse jet control box 3 is connected to the solenoid valve group 2. The pulse jet control box 3 is equipped with multiple output points. The solenoid valve group 2 includes multiple solenoid valves, and every two solenoid valves are connected to one output point. An expansion module is set on the line connecting the solenoid valve group 2 and the pulse jet control box 3. The expansion module is connected to an intermediate relay. One end of the solenoid valve is connected to one end of the intermediate relay. Multiple intermediate relays are set, and one intermediate relay is connected to multiple solenoid valves.

[0036] The pulse jet control box 3, controller A1, outputs 10 DO points, which are converted into 20 circuits through expansion modules and intermediate relay contacts. These circuits are connected from the pulse jet control box 3 and the tap terminal box to the corresponding solenoid valves on the dust collector. The pulse jet control box 3 is connected to the jet solenoid valve ② on the dust collector via a control cable. The expansion module A2 (Figure 3) in the dust collector's pulse control box controls the on / off state of three intermediate relays (KA1-KA3) through the timer function in the PLC module. Specifically, at the first 10*(t1+t...)... 2) During the first time interval, all KA1-KA3 are energized, and during the second 10*(t1+t2) time interval, all KA1-KA3 are de-energized. This cycle repeats, causing the intermediate relays to periodically switch on and off. Here, t1 is the interval between YV1 and YV2, YV2 and YV3, etc., and t2 is the duration of the pulse jet cleaning. After the modification, as long as compressed air is supplied to the compressed air pipeline and 220VAC AC power is provided to the pulse jet cleaning control box 3, the dust collector's pulse jet cleaning system can operate automatically.

[0037] The dust collector is equipped with a pulse jet control box with 10 DO points and 20 solenoid valves as standard. That is, 10 DO points control 20 solenoid valves, that is, 1 DO point controls 2 solenoid valves at the same time. Every 2 solenoid valves with the same serial number in the 2 columns of dust collectors are grouped together.

[0038] The normally open contact of the intermediate relay is connected to the output point of part of the pulse jet control box 3 and the terminal connection of part of the electrical terminal tap box 4. The normally closed contact of the intermediate relay is connected to the output point of another part of the pulse jet control box 3 and the terminal connection of another part of the electrical terminal tap box 4. The normally closed contacts of intermediate relays KA1-KA3 are connected in series in the circuit between YV1-YV10 and terminals D1-D10, and the normally open contacts of KA1-KA3 are connected in series in the circuit between YV11-YV20 and terminals D1-D10.

[0039] Adding module A2 to the dust collector I / O control box creates an expansion module. As shown in Figure 2, three intermediate relays (KA1-KA3) with 4NO / NC are installed in one row of pulse jet solenoid valves (YV1-YV10) in the dust collector. A suitable number of terminals are installed, and a multi-core control cable is used to connect the 10 digital outputs D1-D10 of the pulse jet controller A1 to the terminals. The normally closed contacts of the intermediate relays KA1-KA3 are connected in series in the circuit between YV1-YV10 and the terminals.

[0040] In the second row of pulse jet solenoid valve boxes (YV11-YV20), multi-core control cables are used to connect the pulse jet solenoid valves YV11-YV20 to the terminal blocks. The 10 digital outputs D1-D10 are connected to the normally open contacts of the intermediate relays KA1-KA3, so that the normally open contacts of KA1-KA3 are connected in series in the circuit between YV11-YV20 and the terminal blocks.

[0041] An intermediate relay is connected in series with the solenoid valve and electrically connected to an expansion module, which controls the on / off state of the intermediate relay. An electrical terminal box 4 is installed between the pulse control box and the solenoid valve assembly 2, connecting them. The electrical terminal box 4 contains multiple terminals, and the intermediate relay has normally open and normally closed contacts. The pulse jet control box 3 is electrically connected to a high-voltage power supply, and one end of the solenoid valve assembly 2 is also electrically connected to the high-voltage power supply.

[0042] Example 2:

[0043] A control method for a pulse jet cleaning control device for a bag filter includes the following steps: Multiple intermediate relays and appropriate terminals are installed in the control boxes of two rows of solenoid valves in the dust collector. The normally open / normally closed contacts of the intermediate relays are connected in series between the pulse signal line and the solenoid valve coil. By adding a DO module to the dust collector I / O control and modifying the PLC control program to control the on / off state of the intermediate relays, the pulse signal on / off state of each row can be independently controlled. This prevents the solenoid valves with the same sequence number in the two rows from operating simultaneously, reducing the compressed air flow by half each time the dust is cleaned, thereby reducing the impact of pulse jet cleaning on pressure fluctuations.

[0044] The pulse jet control box 3's main control board outputs 10 pulse output points D1-D10, which are connected to the dust collector via terminals to correspond to 20 solenoid valves in 2 columns. As can be seen from the control circuit, by modifying the PLC control program to use a 10x single pulse (t1+t2) periodic control of the DO module output, and then controlling the on / off state of the intermediate relay, it is possible to independently control the pulse signal on / off state of each column. This ensures that the solenoid valves YV1 / YV11, YV2 / YV12, YV3 / YV13, YV4 / YV14, YV5 / YV15, YV6 / YV16, YV7 / YV17, YV8 / YV18, YV9 / YV19, and YV10 / YV20 in the same group of 2 columns will not work simultaneously, while still enabling the 20 solenoid valves to perform pulse jet operation in a cyclical manner.

[0045] As shown in Figure 3, an expansion module A2 is added to the dust collector pulse control box. A2 controls the on / off state of three intermediate relays (KA1-KA3) through a PLC timer. In the first 10*(t1+t2) time period, all KA1-KA3 are energized, and in the second 10*(t1+t2) time period, all KA1-KA3 are de-energized. This cycle repeats, causing the intermediate relays to periodically turn on and off. Each intermediate relay has four normally open and normally closed contacts. A pair of normally open and normally closed contacts are connected in series to the circuit of controller A1, as shown by the dotted line in Figure 2. The effect of this improvement is that, originally, the solenoid valves YV1 in the first column and YV11 in the second column would be energized simultaneously when D1 had an output to perform pulse jetting. After the improvement, because the normally open and normally closed contacts of the same intermediate relay cannot be energized at the same time, only one of the two solenoid valves, YV1 and YV11, can be energized to perform pulse jetting. Similarly, the solenoid valves YV1 / YV11, YV2 / YV12...YV10 / YV20 in the same group of these two columns will not work at the same time, thereby reducing the compressed air flow by half and reducing the pressure fluctuation amplitude of the pipeline caused by pulse jetting.

[0046] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A pulse jet cleaning control device for a bag filter, characterized in that, The system includes a housing, inside which dust collector bags are installed. A solenoid valve assembly is located at the bottom of the housing, arranged in two rows. A pulse jet control box is located below the solenoid valve assembly, and an electrical terminal box is located on one side of the pulse jet control box. The output points of the pulse jet control box are connected to the solenoid valve assembly. The pulse jet control box contains multiple output points. The solenoid valve assembly includes multiple solenoid valves, with each pair of solenoid valves connected to an output point via an intermediate relay. An expansion module is installed on the line connecting the solenoid valve assembly and the pulse jet control box. The intermediate relay is electrically connected to the expansion module. The expansion module is used to control the on / off state of intermediate relays. One end of the solenoid valve is connected to one end of the intermediate relay. Multiple intermediate relays are provided, and one intermediate relay is connected to multiple solenoid valves. The intermediate relays are provided with normally open contacts and normally closed contacts, which are connected in series with the coils of the solenoid valves. The normally open contacts of intermediate relays KA1-KA3 are connected in series to the circuit of one solenoid valve group YV1-YV10 and output points D1-D10. The normally closed contacts of intermediate relays KA1-KA3 are connected in series to the circuit of another solenoid valve group YV11-YV20 and output points D1-D10.

2. The pulse jet cleaning control device for a bag filter as described in claim 1, characterized in that, An electrical terminal junction box is provided between the pulse jet control box and the solenoid valve group. The electrical terminal junction box is used to connect the pulse jet control box and the solenoid valve group. The electrical terminal junction box is provided with multiple terminals.

3. The pulse jet cleaning control device for a bag filter as described in claim 1, characterized in that, The pulse jet control box is electrically connected to a high-voltage power supply, and one end of the solenoid valve assembly is electrically connected to the high-voltage power supply.

4. The pulse jet cleaning control device for a bag filter as described in claim 1, characterized in that, A dust hopper is installed at the bottom of the box, and the dust hopper is fixedly connected to the box.

5. The pulse jet cleaning control device for a bag filter as described in claim 1, characterized in that, A dust collector bracket is installed at the bottom of the housing, and the dust collector bracket is fixedly connected to the housing.

6. A control method for a pulse jet cleaning control device for a bag filter as described in any one of claims 1-5, comprising the steps of: energizing the pulse jet cleaning control box with a high-voltage power supply; after energization, the pulse jet cleaning control box transmits current to intermediate relays through a circuit; each intermediate relay controls the on / off state of multiple solenoid valves; and according to the control program written in the extension module, controlling the periodic on / off state of multiple intermediate relays can achieve independent control of the pulse signal on / off state of each column, so that the solenoid valves with the same sequence number in these two columns do not work simultaneously, reducing the compressed air flow by half each time the dust is cleaned by pulse jet cleaning, thereby reducing the impact of pulse jet cleaning on pressure fluctuations.

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