A Drainage Control Method for a Stem Washer

Abstract

The present invention relates to a drainage control method for a stem washer, which determines the volume of the drainage water tank of the stem washer, the sewage discharge volume of the sewage pump, and the sewage discharge flow rate of the sewage discharge; determines whether the volume of the drainage water tank of the stem washer matches the sewage discharge volume of the sewage pump, and whether the sewage discharge volume of the sewage pump matches the sewage discharge flow rate of the sewage discharge; if both match, the drainage of the stem washer is not controlled, otherwise, by controlling the sewage pump to continuously operate for a first set time and then stop operating for a second set time, the water level in the drainage water tank of the stem washer is basically kept balanced. This technical solution realizes the matching of the drainage capacity of the stem washer and the sewage discharge capacity of the sewage drainage tank by controlling the start and stop time of the sewage pump in the drainage water tank of the stem washer.

Description

Technical Field

[0001] The invention belongs to the technical field of cigarette manufacturing, and in particular relates to a drainage control method for a stem washing machine. Background Art

[0002] The water trough type tobacco stem rehumidification machine is a special equipment used for cleaning, decontamination and direct rehumidification of tobacco stems on the tobacco stem branch line at the front end of the silk production line in the tobacco industry.

[0003] According to the difference in specific gravity between soil, sand and other foreign matter carried in the incoming materials and water, after being fully mixed with water, the dust is dissolved in the water, and foreign matter such as sand and metal is deposited, so as to achieve the purpose of stem washing. At the same time, the tobacco stems can be heated and humidified after being immersed in warm water. The water in the high and low water tanks is circulated and forms a water level difference under the action of the water pump. The water in the high water tank and the material enter the "S"-shaped cleaning channel at the entrance. In the process of water flowing from high to low, it is fully mixed with the tobacco stems and enters the downward inclined separation tank. Sand, metal and other foreign matter then sink to the bottom of the corrugated board of the separation tank. The tobacco stems flow into the chain belt of the chain conveyor with the water, so that the tobacco stems and water begin to separate. During the transportation process, the water is drained and transported to the next process. The water flows back to the water tank along the water collection tank at the bottom of the conveyor. The stem washing time is controlled by adjusting the pump flow rate through frequency conversion, and the stem washing time is adjusted by adjusting the chain speed through frequency conversion.

[0004] Through actual equipment use, it was found that the drainage capacity of the WQ822 water tank type tobacco stem rehumidification machine (hereinafter referred to as the stem washing machine) did not match the sewage discharge capacity of the water tank. The car blocker and the central control operator worked together to prevent sewage overflow, set up a separate drainage intercom and channel to contact the start and stop of drainage, and sometimes it would cause sewage overflow at the stem washing machine if it was not timely, which not only affected the site but also increased the workload of the operator. Summary of the invention

[0005] The object of the present invention is to provide a drainage control method for a stem washer to solve the problems existing in the above-mentioned background technology.

[0006] To achieve the above objectives, this application is implemented through the following technical solutions:

[0007] A drainage control method for a stem washer comprises the following steps:

[0008] S1. Determine the volume of the drainage tank of the stem washing machine, the discharge volume of the sewage pump and the sewage discharge flow rate;

[0009] S2, determine whether the volume of the drainage tank of the stem washing machine matches the discharge volume of the sewage pump, and whether the discharge volume of the sewage pump matches the sewage discharge flow rate of the sewage; if both match, enter S3, if one does not match, enter S4;

[0010] S3. No control of the drainage of the stem washing machine;

[0011] S4. Stop the sewage pump from running for the second set time after continuously running it for the first set time, so as to keep the water level in the drainage water tank of the stem washer basically balanced.

[0012] Furthermore, the method for the first set time and the second set time is as follows:

[0013] S11. Determine that the second set time is N1, where N1 is a non-zero natural number.

[0014] S12. Initially set the first set time as P1, where P1 is a non-zero natural number. At this time, control the sewage pump to run for P1 time, and then the sewage pump stops running for N1. Detect the water level H1 in the drainage water tank of the stem washer. If H1 is basically balanced with the original water level H0, then determine that the first set time is P1 and the second set time is N1.

[0015] S13. If it is detected that the water level in the drainage water tank of the stem washer is H1, and at this time H1 is higher than H0, then set the first set time as P2, where P2 is greater than P1. Control the sewage pump to run for P2 time, and then the sewage pump stops running for N1 time. Detect the water level H2 in the drainage water tank of the stem washer. If H2 is basically balanced with the original water level H0, then determine that the first set time is P2 and the second set time is N1.

[0016] If H2 is still higher than the original water level H0, then set the first set time as P3, where P3 is greater than P2. Control the sewage pump to run for P3 time, and then the sewage pump stops running for N1 time. Detect the water level H3 in the drainage water tank of the stem washer. If H3 is basically balanced with the original water level H0, then determine that the first set time is P3 and the second set time is N1. If H3 is still higher than the original water level H0, then follow the above method until the first set time Pn is determined, where n is a natural number, and the second set time is N1.

[0017] Furthermore, if H2 is still higher than the original water level H0, H3 is lower than the original water level H0, and the value of (H2 - H0) - (H3 - H0) is within the set range, then determine that the first set time is (P2 + P3) / 2 and the second set time is N1.

[0018] Furthermore, if H2 is still higher than the original water level H0, H3 is lower than the original water level H0, and the value of (H2 - H0) - (H3 - H0) is greater than the maximum value of the set range, then determine that the first set time is P3 and the second set time is N1.

[0019] Furthermore, if H2 is still higher than the original water level H0, H3 is lower than the original water level H0, and the value of (H2 - H0) - (H3 - H0) is less than the minimum value of the set range, then determine that the first set time is P2 and the second set time is N1.

[0020] Further, in step S12, if it is detected that H1 is lower than the original water level H0, the first set time is set to Pk2, where Pk2 is less than P1, the second set time is N1, the sewage pump is controlled to operate for Pk2 time, and then the sewage pump stops operating for N1 time. The water level Hk2 in the drainage sink of the stem washer is detected. If Hk2 is basically balanced with the original water level H0, the first set time is determined to be Pk2 and the second set time is N1.

[0021] If it is detected that Hk2 is lower than the original water level H0, the first set time is set to Pk3, where Pk3 is less than Pk2, the second set time is N1, the sewage pump is controlled to operate for Pk3 time, and then the sewage pump stops operating for N1 time. The water level Hk3 in the drainage sink of the stem washer is detected. If Hk3 is basically balanced with the original water level H0, the first set time is determined to be Pk3 and the second set time is N1. If Hk3 is still lower than the original water level H0, the above steps are repeated until Hkn is basically balanced with the original water level H0, and the first set time is determined to be Pkn and the second set time is N1, where n is a natural number.

[0022] The beneficial effects of the present invention are as follows;

[0023] This technical solution realizes the matching of the drainage capacity of the stem washer and the sewage discharge capacity of the lower drainage sink by controlling the start and stop times of the sewage pump in the drainage sink of the stem washer. Specific Embodiments

[0024] The technical solution of the present invention will be described in detail below. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, and cannot be construed as a limitation of the technical solution of the present invention.

[0025] The present application provides a drainage control method for a stem washer, including the following steps:

[0026] S1. Determine the volume of the drainage sink of the stem washer, the sewage discharge volume of the sewage pump, and the sewage discharge flow of the lower drain.

[0027] S2. Determine whether the volume of the drainage sink of the stem washer matches the sewage discharge volume of the sewage pump, and whether the sewage discharge volume of the sewage pump matches the sewage discharge flow of the lower drain. If both match, enter S3; if one does not match, enter S4.

[0028] S3. Do not control the drainage of the stem washer.

[0029] S4. By controlling the sewage pump to continuously operate for the first set time and then stop operating for the second set time, the water level in the drainage sink of the stem washer is basically maintained in balance.

[0030] The method for determining the first set time and the second set time is as follows:

[0031] S11. Determine that the second set time is N1, where N1 is a non-zero natural number;

[0032] S12. Initially set the first set time as P1, where P1 is a non-zero natural number. At this time, control the sewage pump to operate for P1 time, then the sewage pump stops operating for N1. Detect the water level H1 in the drainage sink of the stem washer. If H1 is basically balanced with the original water level H0, then determine that the first set time is P1 and the second set time is N1;

[0033] S13. If it is detected that the water level in the drainage sink of the stem washer is H1, and at this time H1 is higher than H0, then set the first set time as P2, where P2 is greater than P1. Control the sewage pump to operate for P2 time, then the sewage pump stops operating for N1 time. Detect the water level H2 in the drainage sink of the stem washer. If H2 is basically balanced with the original water level H0, then determine that the first set time is P2 and the second set time is N1;

[0034] If H2 is still higher than the original water level H0, then set the first set time as P3, where P3 is greater than P2. Control the sewage pump to operate for P3 time, then the sewage pump stops operating for N1 time. Detect the water level H3 in the drainage sink of the stem washer. If H3 is basically balanced with the original water level H0, then determine that the first set time is P3 and the second set time is N1; if H3 is still higher than the original water level H0, then follow the above method until the first set time Pn is determined, where n is a natural number, and the second set time is N1.

[0035] If H2 is still higher than the original water level H0, H3 is lower than the original water level H0, and the value of (H2 - H0) - (H3 - H0) is within the set range, then determine that the first set time is (P2 + P3) / 2 and the second set time is N1.

[0036] If H2 is still higher than the original water level H0, H3 is lower than the original water level H0, and the value of (H2 - H0) - (H3 - H0) is greater than the maximum value of the set range, then determine that the first set time is P3 and the second set time is N1.

[0037] If H2 is still higher than the original water level H0, H3 is lower than the original water level H0, and the value of (H2 - H0) - (H3 - H0) is less than the minimum value of the set range, then determine that the first set time is P2 and the second set time is N1.

[0038] In step S12, if it is detected that H1 is lower than the original water level H0, the first set time is set to Pk2, where Pk2 is less than P1, the second set time is N1, the sewage pump is controlled to operate for Pk2 time, and then the sewage pump stops operating for N1 time. The water level Hk2 of the drainage sink of the stem washer is detected. If Hk2 is basically balanced with the original water level H0, the first set time is determined to be Pk2 and the second set time is N1.

[0039] If it is detected that Hk2 is lower than the original water level H0, the first set time is set to Pk3, where Pk3 is less than Pk2, the second set time is N1, the sewage pump is controlled to operate for Pk3 time, and then the sewage pump stops operating for N1 time. The water level Hk3 of the drainage sink of the stem washer is detected. If Hk3 is basically balanced with the original water level H0, the first set time is determined to be Pk3 and the second set time is N1. If Hk3 is still lower than the original water level H0, the above steps are repeated until Hkn is basically balanced with the original water level H0, and the first set time is determined to be Pkn and the second set time is N1, where n is a natural number.

[0040] Embodiment

[0041] Here, the WQ822 type flume type tobacco stem rewetting machine is taken as an example for illustration. In actual production, the drainage capacity of the WQ822 type flume type tobacco stem rewetting machine does not match the sewage discharge capacity of the lower drainage sink. Through actual measurement and analysis: the opening degree of the drainage valve of the stem washer cannot be controlled, and there are only two states, open and closed, and the adjustment of the opening degree size cannot be carried out.

[0042] The sewage pump supporting the drainage sink of the stem washer is 80GW40-7-2.2, and its sewage discharge capacity is 40m 3 / h. The size of the water tank is 0.49m in length, 0.28m in width, and 0.09m in height. After calculation, the volume of the water tank is 0.012348m 3 .

[0043] Sewage discharge capacity of the lower drain:

[0044] The diameter of the lower drain pipe is 0.07m, and the cross-sectional area is 0.0038465m 2 According to the water pipe flow meter, the water flow velocity of the PD65 pipeline is 1.1 - 1.4m / s, and the water flow rate is obtained as 11.9 - 16.7m 3 / h, as shown in Table 1 specifically:

[0045] Table 1

[0046]

[0047] In order to achieve the intermittent drainage electric control function of the sewage pump PLC, corresponding control programs can be written according to specific control results, or control programs can not be written. According to the control method of this application, actual drainage tests are carried out:

[0048] In the first test, the sewage pump starts for 2 seconds and stops for 8 seconds. Through on-site detection, it is found that the liquid level in the water tank is lower than the original liquid level, and the drainage time of the sewage pump needs to be adjusted.

[0049] In the second test, the sewage pump starts for 3 seconds and stops for 8 seconds. Through on-site detection, it is found that the liquid level in the water tank is still lower than the original liquid level, and the drainage time of the sewage pump needs to be adjusted.

[0050] In the third test, the sewage pump starts for 4 seconds and stops for 8 seconds. Through on-site detection, it is found that the liquid level in the water tank is basically balanced with the original liquid level. After multiple debuggings, the predicted effect is achieved, and finally it is determined that the sewage start time is 4 seconds and the stop time is 8 seconds.

[0051] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, alterations, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A drainage control method for a stem washer, characterized in that, It includes the following steps: S1. Determine the volume of the drainage water tank of the stem washer, the sewage discharge capacity of the sewage pump, and the sewage discharge flow of the sewage drain; S2. Determine whether the volume of the drainage water tank of the stem washer matches the sewage discharge capacity of the sewage pump, and whether the sewage discharge capacity of the sewage pump matches the sewage discharge flow of the sewage drain; if both match, go to S3, if either does not match, go to S4; S3. Do not control the drainage of the stem washer; S4. By controlling the sewage pump to continuously operate for a first set time and then stop operating for a second set time, so as to keep the water level in the drainage water tank of the stem washer basically balanced; The determination method of the first set time and the second set time is as follows: S11. Determine that the second set time is N1, where N1 is a non-zero natural number; S12. Initially set the first set time as P1, P1 is a non-zero natural number. At this time, control the sewage pump to operate for P1 time, then the sewage pump stops operating for N1, and detect the water level H1 in the drainage water tank of the stem washer. If H1 is basically balanced with the original water level H0, then determine that the first set time is P1 and the second set time is N1; S13. If it is detected that the water level in the drainage water tank of the stem washer is H1, and at this time HI is higher than H0, then set the first set time as P2, P2 is greater than P1. Control the sewage pump to operate for P2 time, then the sewage pump stops operating for N1 time, and detect the water level H2 in the drainage water tank of the stem washer. If H2 is basically balanced with the original water level H0, then determine that the first set time is P2 and the second set time is N1; If H2 is still higher than the original water level H0, then set the first set time as P3, P3 is greater than P2. Control the sewage pump to operate for P3 time, then the sewage pump stops operating for N1 time, and detect the water level H3 in the drainage water tank of the stem washer. If H3 is basically balanced with the original water level H0, then determine that the first set time is P3 and the second set time is N1; if H3 is still higher than the original water level H0, repeat the above steps until the first set time Pn is determined, where n is a natural number, and the second set time is N1; If H2 is still higher than the original water level H0, H3 is lower than the original water level H0, and the value of (H2 - H0) - (H3 - H0) is within the set range, then determine that the first set time is (P2 + P3) / 2 and the second set time is N1; If H2 is still higher than the original water level H0, H3 is lower than the original water level H0, and the value of (H2 - H0) - (H3 - H0) is greater than the maximum value of the set range, then determine that the first set time is P3 and the second set time is N1; If H2 is still higher than the original water level H0, H3 is lower than the original water level H0, and the value of (H2 - H0) - (H3 - H0) is less than the minimum value of the set range, then determine that the first set time is P2 and the second set time is N1.

2. The drainage control method of the stem washer according to claim 1, characterized in that, In step S12, if it is detected that H1 is lower than the original water level H0, the first set time is set to Pk2, where Pk2 is less than P1, the second set time is set to N1, the sewage pump is controlled to operate for Pk2 time, and then the sewage pump stops operating for N1 time. The water level Hk2 of the drainage sink of the stem washer is detected. If Hk2 is basically balanced with the original water level H0, the first set time is determined to be Pk2 and the second set time is determined to be N1. If it is detected that Hk2 is lower than the original water level H0, the first set time is set to Pk3, where Pk3 is less than Pk2, the second set time is set to N1, the sewage pump is controlled to operate for Pk3 time, and then the sewage pump stops operating for N1 time. The water level Hk3 of the drainage sink of the stem washer is detected. If Hk3 is basically balanced with the original water level H0, the first set time is determined to be Pk3 and the second set time is determined to be N1. If Hk3 is still lower than the original water level H0, repeat the above steps until Hkn is basically balanced with the original water level H0, and the first set time is determined to be Pkn and the second set time is determined to be N1, where n is a natural number.

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