A TFT substrate glass kiln exhaust fan automatic switching device and method

Abstract

This invention provides an automatic switching device and method for exhaust fans in a TFT substrate glass furnace, belonging to the field of glass manufacturing technology. The automatic switching device includes an inlet linkage motor and an outlet linkage motor; the inlet linkage motor is connected to a first inlet valve and a second inlet valve; the outlet linkage motor has a first outlet valve and a second outlet valve; a first exhaust fan is installed between the first inlet valve and the first outlet valve; and a second exhaust fan is installed between the second inlet valve and the second outlet valve. This invention improves the online switching of exhaust fans to backup units, ensuring control precision and minimizing pressure fluctuations within the furnace. The device operates by having the inlet linkage motor open one inlet valve and close the other, and the outlet linkage motor open the outlet valve to be switched and close the corresponding outlet valve of the exhaust fan, thereby reducing the risk of fluctuations during the switching process.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of glass manufacturing, and particularly relates to a TFT substrate glass kiln exhaust fan automatic switching device and method. BACKGROUND

[0002] Liquid crystal glass belongs to borate glass, and the content of borides, nitrogen oxides and the like in flue gas is relatively high. In order to ensure that flue gas emission meets the standard, the flue gas needs to be treated by NCR and the like. In the process of flue gas from the furnace to the NCR reaction tower, the borides and the like need to be reduced. In the design, the front flue section uses cooling air for rapid cooling to make the borides and the like condense rapidly, so as to meet the process requirements. However, during the flue gas emission process, a small amount of volatile substances will condense during the long-time operation of the exhaust fan. In normal production, the exhaust fan needs to be switched regularly for equipment maintenance after a period of operation. If there is a slight difference in the switching process, the internal pressure of the kiln will be affected.

[0003] In order to ensure normal furnace pressure and stable process, the exhaust fan needs to be switched regularly. At present, the on-line switching of the exhaust fan is achieved by one person communicating with the field control valve personnel through a intercom and remotely controlling the frequency of the exhaust fan to stabilize the furnace pressure. Two people on the scene control the valve switching. If there is a slight deviation between the remote control personnel and the scene, the internal pressure of the furnace will fluctuate, which will cause the glass liquid in the kiln to fluctuate and bring a large number of defects. SUMMARY

[0004] In order to overcome the shortcomings that the exhaust fans are difficult to operate consistently and the furnace pressure is unstable in the prior art, the purpose of the present application is to provide a TFT substrate glass kiln exhaust fan automatic switching device and method. The device improves the exhaust fan system device, so that the operation is relatively simple, the process is more easily controlled, and the risk is smaller. The automatic switching method uses a motor to open and close the valve, so as to reduce the fluctuation of the internal pressure of the furnace during the switching process of the fan.

[0005] In order to achieve the above purpose, the following technical solutions are adopted in the present application:

[0006] The TFT substrate glass kiln exhaust fan automatic switching device comprises first and second exhaust pipes connected in parallel; a first inlet valve, a first exhaust fan and a first outlet valve are sequentially arranged on the first exhaust pipe; a second inlet valve, a second exhaust fan and a second outlet valve are sequentially arranged on the second exhaust pipe;

[0007] The first and second inlet valves are connected with a first motor; and the first and second outlet valves are connected with a second motor.

[0008] The first and second motors are connected with a control module.

[0009] The control module is further connected with a DCS control system.

[0010] The first motor is an inlet linkage motor, and the second motor is an outlet linkage motor.

[0011] The gas inlet of the first exhaust pipe and the second exhaust pipe is connected with a treated flue gas inlet.

[0012] The gas outlet of the first exhaust pipe and the second exhaust pipe is connected with a chimney.

[0013] The application further relates to an automatic switching method of a TFT substrate glass kiln exhaust fan based on the device in any one of claims 1 to 5.

[0014] S1: starting the first exhaust fan and the second exhaust fan;

[0015] S2: when the second exhaust fan and the first exhaust fan have the same frequency, clicking an internal switching button of the control module; the second motor controls the second outlet valve to be fully opened;

[0016] S3: obtaining the speed of opening the second inlet valve and closing the first inlet valve;

[0017] S4: the first motor synchronously opens the second inlet valve and closes the first inlet valve according to the speed in S3;

[0018] S5: a remote operator closes the first exhaust fan, the second motor closes the first outlet valve, and the switching fan operation is completed.

[0019] In S3, the speed of opening the second inlet valve and closing the first inlet valve is obtained by obtaining the difference between an actual detection value of furnace pressure and a target set value of furnace pressure, and according to the difference, the speed of opening one inlet valve and closing the other inlet valve is given.

[0020] The target set value of furnace pressure is 20 Mpa, and the actual detection value of furnace pressure is 15-25 Mpa.

[0021] The difference between the actual detection value of furnace pressure and the target set value of furnace pressure is equal to the difference between the speed of opening one inlet valve and closing the other inlet valve; and the difference between the speed of opening one inlet valve and closing the other inlet valve is ≤5 S.

[0022] When the actual detection value of furnace pressure is less than the target set value of furnace pressure, the opening speed of the inlet valve is greater than the original closing speed of the inlet valve.

[0023] When the actual detection value of the furnace pressure is equal to the target set value of the furnace pressure, the opening speed of the inlet valve is equal to the original closing speed of the inlet valve;

[0024] When the actual detection value of the furnace pressure is greater than the target set value of the furnace pressure, the opening speed of the inlet valve is less than the original closing speed of the inlet valve.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] The automatic switching device for the TFT substrate glass kiln exhaust fan of the present application adds an inlet linkage motor, an outlet linkage motor and a control module, and mainly functions to adjust the valves with the same opening degree by program setting of the inlet and outlet valves of the two-way exhaust fan, drive the valves by the motor, ensure the safety of the internal equipment in the region and the stability of the furnace pressure, improve the online switching of the standby machine of the exhaust fan, guarantee the control precision, and make the furnace pressure fluctuation relatively small.

[0027] The automatic switching method of the automatic switching device for the TFT substrate glass kiln exhaust fan of the present application, when the original exhaust fan runs to a certain period and needs to be switched to another exhaust fan, the inlet linkage motor performs the action of opening one inlet and closing the other inlet valve, controls the relative speed of the two inlet valves to control the low furnace pressure fluctuation in the switching process; the outlet linkage motor performs the action of opening the outlet valve to be switched and closing the outlet valve corresponding to the exhaust fan, reduces the risk of furnace pressure fluctuation in the switching process; the switching method is simple in operation, high in consistency, good in completeness, stable in furnace pressure and safe and controllable in process. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The existing technology exhaust fan device diagram;

[0029] Figure 2 The automatic switching device for the exhaust fan of the present application;

[0030] 1-First inlet valve; 2-First outlet valve; 3-First exhaust fan; 4-Second inlet valve; 5-Second outlet valve; 6-Second exhaust fan; 7-Processed flue gas inlet; 8-Inlet linkage motor; 9-Outlet linkage motor; 10-Chimney. DETAILED DESCRIPTION

[0031] In order to enable personnel in the technical field to better understand the present application scheme, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] The present invention will now be described in further detail with reference to the accompanying drawings:

[0034] like Figure 2 As shown, the automatic switching device for exhaust fans of a TFT substrate glass kiln according to the present invention includes a first inlet valve 1, a first outlet valve 2, a first exhaust fan 3, a second inlet valve 4, a second outlet valve 5, a second exhaust fan 6, a treated flue gas inlet 7, an inlet linkage motor 8, an outlet linkage motor 9, and a chimney 10.

[0035] The exhaust pipe can be further divided into an inlet pipe and an outlet pipe; the exhaust pipe includes a first exhaust pipe and a second exhaust pipe; the first exhaust pipe and the second exhaust pipe are connected in parallel; the treated flue gas inlet 7 is connected to the inlet of the first exhaust fan 3 through the first inlet pipe; the first inlet valve 1 is installed on the first inlet pipe; the outlet of the first exhaust fan 3 is connected to the inlet of the chimney 10 through the first outlet pipe; the first outlet valve 2 is installed on the first outlet pipe;

[0036] The treated flue gas inlet 7 is connected to the inlet of the second exhaust fan 6 through the second inlet pipe; the second inlet valve 4 is installed on the second inlet pipe; the outlet of the second exhaust fan 6 is connected to the inlet of the chimney 10 through the second outlet pipe; the second outlet valve 5 is installed on the second outlet pipe.

[0037] The inlet linkage motor 8 is connected to the first inlet valve 1 and the second inlet valve 4 at both ends, respectively; the outlet linkage motor 9 is connected to the first outlet valve 2 and the second outlet valve 5 at both ends, respectively; both the inlet linkage motor 8 and the outlet linkage motor 9 are electrically connected to the control module; the control module is connected to a DCS control system.

[0038] As an optional solution, the control module is a PLC controller; the first exhaust fan 3 and the second exhaust fan 6 have the same equipment parameters.

[0039] As Figure 1 shown, the steps of using the existing smoke exhaust fan device are as follows:

[0040] S1: When the first smoke exhaust fan 3 runs to a certain period and needs to switch to the second smoke exhaust fan 6, the operator first fully opens the second outlet valve 5 and manually starts the second smoke exhaust fan 6.

[0041] S2: Coordinate the remote control of the furnace pressure personnel through the intercom, and two people start operating at the same time, one gradually closes the first inlet valve 1 while the other gradually opens the second inlet valve 4.

[0042] S3: The remote control personnel adjust according to the on-site adjustment and the furnace pressure display value until the first inlet valve 1 is completely closed and the second inlet valve 4 is completely opened. After the remote control personnel adjust the furnace pressure to be stable,

[0043] S4: The on-site personnel close the first smoke exhaust fan 3 and the first outlet valve 2.

[0044] The prior art is difficult to achieve synchronous and consistent operation through manual operation, and the furnace pressure is not easy to stabilize. The present application improves the device by adding an inlet linkage motor 8, an outlet linkage motor 9 and a control module. The two motors drive the same opening degree adjustment valve to ensure the safety of the internal equipment in the area and the stability of the furnace pressure. The standby machine of the smoke exhaust fan is improved online to ensure the control accuracy and the furnace pressure fluctuation is relatively small.

[0045] As Figure 2 shown, an automatic switching method of a TFT substrate glass kiln smoke exhaust fan based on the device, comprising the following steps:

[0046] S1: When the first smoke exhaust fan 3 runs to a certain period and needs to switch to the second smoke exhaust fan 6, start the second smoke exhaust fan 6, and the remote operator gives the same frequency to the second smoke exhaust fan 6 and the first smoke exhaust fan 3, and click the switch button in the control module.

[0047] S2: The control module issues an instruction, and the outlet linkage motor 9 opens the second outlet valve 5.

[0048] The logical relationship edited by the control module is to open the outlet valve to be switched when starting the switch, and to close the original smoke exhaust fan corresponding outlet valve after confirming the completion of the switch, and to issue an instruction to the outlet linkage motor 9 according to the logical relationship to execute the action of closing or opening a single side outlet valve.

[0049] S3: After confirming that the second outlet valve 5 is fully opened, the control module determines, according to a logical relationship, that the frequency of the fan to be switched is consistent with the current running frequency, and that the outlet valve to be switched has been fully opened. Then, according to the difference between the actual detection value of the furnace pressure and the target set value of the furnace pressure, the speed of opening one inlet valve and closing the other inlet valve is given according to the difference value through algorithm operation, and a command is sent to the inlet linkage motor 8 according to the logical relationship, so that the inlet linkage motor 8 executes the action of synchronously opening the second inlet valve 4 and closing the first inlet valve 1.

[0050] S4: After confirming that the switching is completed, the control module continues to send a command according to a logical relationship, i.e., the outlet valve corresponding to the exhaust fan is closed, and after confirming that the second inlet valve 4 is opened to the position and the first inlet valve 1 is closed to the position, the remote operator closes the first exhaust fan 3, the outlet linkage motor 9 operates to close the first outlet valve 2, and the switching of the fan is completed.

[0051] As an optional solution, in S3, the speed of opening the second inlet valve 4 and closing the first inlet valve 1 is obtained by: obtaining the difference between the actual detection value of the furnace pressure and the target set value of the furnace pressure, and giving the speed of opening one inlet valve and closing the other inlet valve according to the difference value.

[0052] The target set value of the furnace pressure is 20 MPa; the actual detection value of the furnace pressure is 15-25 MPa; the difference between the actual detection value of the furnace pressure and the target set value of the furnace pressure is equal to the difference in the speed of opening one inlet valve and closing the other inlet valve; and the difference in the speed of opening one inlet valve and closing the other inlet valve is ≤5 S.

[0053] When the actual detection value of the furnace pressure is less than the target set value of the furnace pressure, the opening speed of the switched inlet valve is greater than the closing speed of the original inlet valve;

[0054] When the actual detection value of the furnace pressure is equal to the target set value of the furnace pressure, the opening speed of the inlet valve is equal to the closing speed of the original inlet valve;

[0055] When the actual detection value of the furnace pressure is greater than the target set value of the furnace pressure, the opening speed of the switched inlet valve is less than the closing speed of the original inlet valve.

[0056] As an optional solution, the inlet linkage motor 8 can control the opening of the first inlet valve 1 or the second inlet valve 4 to synchronously close the second inlet valve 4 or the first inlet valve 1 according to the control logic relationship of the furnace pressure, control the relative speed of the inlet and outlet valves to control the lower furnace pressure fluctuation during the switching process; and the outlet linkage motor 9 can control the opening or closing of the first outlet valve 2 or the second outlet valve 5 according to the logical relationship.

[0057] Embodiment 1

[0058] S1: Open the first exhaust fan 3 and the second exhaust fan 6;

[0059] S2: When the second exhaust fan 6 and the first exhaust fan 3 have the same frequency of 25 HZ, click to start the internal switching button of the control module;

[0060] S3: The outlet linkage motor 9 controls the second outlet valve 5 to be fully opened;

[0061] S4: The actual detection value of the furnace pressure is 15 Mpa, the target set value of the furnace pressure is 20 Mpa, the difference between the actual detection value and the target set value of the furnace pressure is 5 Mpa, the speed difference given for opening the second inlet valve 4 and closing the first inlet valve 1 is 5 S according to the difference, the target set value of the furnace pressure is greater than the actual detection value of the furnace pressure, the opening speed of the second inlet valve 4 is greater than the closing speed of the first inlet valve 1, the opening speed of the second inlet valve 4 is 15 S, and the closing speed of the first inlet valve 1 is 10 S;

[0062] S5: The inlet linkage motor 8 synchronously opens the second inlet valve 4 and closes the first inlet valve 1 according to the speed in S4;

[0063] S6: The remote operator closes the first exhaust fan 3, the outlet linkage motor 9 closes the first outlet valve 2, and the switching fan operation is completed.

[0064] Example 2

[0065] S1: Open the first exhaust fan 3 and the second exhaust fan 6;

[0066] S2: When the second exhaust fan 6 and the first exhaust fan 3 have the same frequency of 25 HZ, click to start the internal switching button of the control module;

[0067] S3: The outlet linkage motor 9 controls the second outlet valve 5 to be fully opened;

[0068] S4: The actual detection value of the furnace pressure is 16 Mpa, the target set value of the furnace pressure is 20 Mpa, the difference between the actual detection value and the target set value of the furnace pressure is 4 Mpa, the speed difference given for opening the second inlet valve 4 and closing the first inlet valve 1 is 4 S according to the difference, the target set value of the furnace pressure is greater than the actual detection value of the furnace pressure, the opening speed of the second inlet valve 4 is greater than the closing speed of the first inlet valve 1, the opening speed of the second inlet valve 4 is 15 S, and the closing speed of the first inlet valve 1 is 11 S;

[0069] S5: The inlet linkage motor 8 synchronously opens the second inlet valve 4 and closes the first inlet valve 1 according to the speed in S4;

[0070] S6: The remote operator closes the first exhaust fan 3, the outlet linkage motor 9 closes the first outlet valve 2, and the switching fan operation is completed.

[0071] Embodiment 3

[0072] S1: turn on the first exhaust fan 3 and the second exhaust fan 6;

[0073] S2: when the frequency of the second exhaust fan 6 and the first exhaust fan 3 is the same, that is, 25 HZ, click the inner switching button of the control module to start;

[0074] S3: the outlet linkage motor 9 controls the second outlet valve 5 to be fully opened;

[0075] S4: the actual detection value of the furnace pressure is 17 Mpa, the target set value of the furnace pressure is 20 Mpa, the difference between the actual detection value and the target set value of the furnace pressure is 3 Mpa, the speed difference given for opening the second inlet valve 4 and closing the first inlet valve 1 according to the difference is 3 S, the target set value of the furnace pressure is greater than the actual detection value of the furnace pressure, the opening speed of the second inlet valve 4 is greater than the closing speed of the first inlet valve 1, the opening speed of the second inlet valve 4 is 15 S, and the closing speed of the first inlet valve 1 is 12 S;

[0076] S5: the inlet linkage motor 8 synchronously opens the second inlet valve 4 and closes the first inlet valve 1 according to the speed in S4;

[0077] S6: the remote operator closes the first exhaust fan 3, the outlet linkage motor 9 closes the first outlet valve 2, and the switching fan operation is completed.

[0078] Embodiment 4

[0079] S1: turn on the first exhaust fan 3 and the second exhaust fan 6;

[0080] S2: when the frequency of the second exhaust fan 6 and the first exhaust fan 3 is the same, that is, 25 HZ, click the inner switching button of the control module to start;

[0081] S3: the outlet linkage motor 9 controls the second outlet valve 5 to be fully opened;

[0082] S4: the actual detection value of the furnace pressure is 17 Mpa, the target set value of the furnace pressure is 20 Mpa, the difference between the actual detection value and the target set value of the furnace pressure is 3 Mpa, the speed difference given for opening the second inlet valve 4 and closing the first inlet valve 1 according to the difference is 3 S, the target set value of the furnace pressure is greater than the actual detection value of the furnace pressure, the opening speed of the second inlet valve 4 is greater than the closing speed of the first inlet valve 1, the opening speed of the second inlet valve 4 is 15 S, and the closing speed of the first inlet valve 1 is 13 S;

[0083] S5: the inlet linkage motor 8 synchronously opens the second inlet valve 4 and closes the first inlet valve 1 according to the speed in S4;

[0084] S6: the remote operator closes the first exhaust fan 3, the outlet linkage motor 9 closes the first outlet valve 2, and the switching fan operation is completed.

[0085] Example 5

[0086] S1: open the first exhaust fan 3 and the second exhaust fan 6;

[0087] S2: when the frequency of the second exhaust fan 6 and the first exhaust fan 3 is the same, that is, 25 HZ, click to start the inner switching button of the control module;

[0088] S3: the outlet linkage motor 9 controls the second outlet valve 5 to be fully open;

[0089] S4: the actual detection value of the furnace pressure is 19 Mpa, the target set value of the furnace pressure is 20 Mpa, the difference between the actual detection value and the target set value of the furnace pressure is 1 Mpa, the speed difference given for opening the second inlet valve 4 and closing the first inlet valve 1 is 1 S according to the difference, the target set value of the furnace pressure is greater than the actual detection value of the furnace pressure, the opening speed of the second inlet valve 4 is greater than the closing speed of the first inlet valve 1, the opening speed of the second inlet valve 4 is 15 S, and the closing speed of the first inlet valve 1 is 14 S;

[0090] S5: the inlet linkage motor 8 synchronously opens the second inlet valve 4 and closes the first inlet valve 1 according to the speed in S4;

[0091] S6: the remote operator closes the first exhaust fan 3, the outlet linkage motor 9 closes the first outlet valve 2, and the switching fan operation is completed.

[0092] Example 6

[0093] S1: open the first exhaust fan 3 and the second exhaust fan 6;

[0094] S2: when the frequency of the second exhaust fan 6 and the first exhaust fan 3 is the same, that is, 25 HZ, click to start the inner switching button of the control module;

[0095] S3: the outlet linkage motor 9 controls the second outlet valve 5 to be fully open;

[0096] S4: the actual detection value of the furnace pressure is 20 Mpa, the target set value of the furnace pressure is 20 Mpa, the difference between the actual detection value and the target set value of the furnace pressure is 0 Mpa, the speed difference given for opening the second inlet valve 4 and closing the first inlet valve 1 is 0 S according to the difference, the target set value of the furnace pressure is greater than the actual detection value of the furnace pressure, the opening speed of the second inlet valve 4 is equal to the closing speed of the first inlet valve 1, the opening speed of the second inlet valve 4 is 15 S, and the closing speed of the first inlet valve 1 is 15 S;

[0097] S5: The inlet linkage motor 8 opens the second inlet valve 4 and closes the first inlet valve 1 at the speed in S4;

[0098] S6: The remote operator closes the first smoke exhaust fan 3, and the outlet linkage motor 9 closes the first outlet valve 2, and the switching fan operation is completed.

[0099] Example 7

[0100] S1: Open the first smoke exhaust fan 3 and the second smoke exhaust fan 6;

[0101] S2: When the frequency of the second smoke exhaust fan 6 and the first smoke exhaust fan 3 is the same as 25HZ, click to start the inner switching button of the control module;

[0102] S3: The outlet linkage motor 9 controls the second outlet valve 5 to be fully open;

[0103] S4: The actual detection value of the furnace pressure is 21Mpa, and the target set value of the furnace pressure is 20Mpa; the difference between the actual detection value of the furnace pressure and the target set value of the furnace pressure is 1Mpa; according to the difference, the speed difference of opening the second inlet valve 4 and closing the first inlet valve 1 is given as 1S; the target set value of the furnace pressure is less than the actual detection value of the furnace pressure, and the opening speed of the second inlet valve 4 is less than the closing speed of the first inlet valve 1; the opening speed of the second inlet valve 4 is 14S, and the closing speed of the first inlet valve 1 is 15S;

[0104] S5: The inlet linkage motor 8 opens the second inlet valve 4 and closes the first inlet valve 1 at the speed in S4;

[0105] S6: The remote operator closes the first smoke exhaust fan 3, and the outlet linkage motor 9 closes the first outlet valve 2, and the switching fan operation is completed.

[0106] Example 8

[0107] S1: Open the first smoke exhaust fan 3 and the second smoke exhaust fan 6;

[0108] S2: When the frequency of the second smoke exhaust fan 6 and the first smoke exhaust fan 3 is the same as 25HZ, click to start the inner switching button of the control module;

[0109] S3: The outlet linkage motor 9 controls the second outlet valve 5 to be fully open;

[0110] S4: the actual detection value of the furnace pressure is 22 Mpa, the target set value of the furnace pressure is 20 Mpa; the difference value between the actual detection value of the furnace pressure and the target set value of the furnace pressure is 2 Mpa; the speed difference value given for opening the second inlet valve 4 and closing the first inlet valve 1 is 2 S according to the difference value; the target set value of the furnace pressure is less than the actual detection value of the furnace pressure, and the opening speed of the second inlet valve 4 is less than the closing speed of the first inlet valve 1; the opening speed of the second inlet valve 4 is 13 S, and the closing speed of the first inlet valve 1 is 15 S;

[0111] S5: the inlet linkage motor 8 synchronously opens the second inlet valve 4 and closes the first inlet valve 1 according to the speed in S4;

[0112] S6: the remote operator closes the first smoke exhaust fan 3, the outlet linkage motor 9 closes the first outlet valve 2, and the switching fan operation is completed.

[0113] Example 9

[0114] S1: open the first smoke exhaust fan 3 and the second smoke exhaust fan 6;

[0115] S2: when the frequency of the second smoke exhaust fan 6 and the first smoke exhaust fan 3 is the same, that is, 25 HZ, click to start the inner switching button of the control module;

[0116] S3: the outlet linkage motor 9 controls the second outlet valve 5 to be fully opened;

[0117] S4: the actual detection value of the furnace pressure is 23 Mpa, the target set value of the furnace pressure is 20 Mpa; the difference value between the actual detection value of the furnace pressure and the target set value of the furnace pressure is 3 Mpa; the speed difference value given for opening the second inlet valve 4 and closing the first inlet valve 1 is 3 S according to the difference value; the target set value of the furnace pressure is less than the actual detection value of the furnace pressure, and the opening speed of the second inlet valve 4 is less than the closing speed of the first inlet valve 1; the opening speed of the second inlet valve 4 is 12 S, and the closing speed of the first inlet valve 1 is 15 S;

[0118] S5: the inlet linkage motor 8 synchronously opens the second inlet valve 4 and closes the first inlet valve 1 according to the speed in S4;

[0119] S6: the remote operator closes the first smoke exhaust fan 3, the outlet linkage motor 9 closes the first outlet valve 2, and the switching fan operation is completed.

[0120] Example 10

[0121] S1: open the first smoke exhaust fan 3 and the second smoke exhaust fan 6;

[0122] S2: when the frequency of the second smoke exhaust fan 6 and the first smoke exhaust fan 3 is the same, that is, 25 HZ, click to start the inner switching button of the control module;

[0123] S3: the outlet linkage motor 9 controls the second outlet valve 5 to be fully opened;

[0124] S4: the actual detection value of the furnace pressure is 24 Mpa, the target set value of the furnace pressure is 20 Mpa; the difference between the actual detection value and the target set value of the furnace pressure is 4 Mpa; the speed difference between the opening of the second inlet valve 4 and the closing of the first inlet valve 1 is given according to the difference value, which is 4 S; the target set value of the furnace pressure is less than the actual detection value of the furnace pressure, and the opening speed of the second inlet valve 4 is less than the closing speed of the first inlet valve 1; the opening speed of the second inlet valve 4 is 11 S, and the closing speed of the first inlet valve 1 is 15 S;

[0125] S5: the inlet linkage motor 8 synchronously opens the second inlet valve 4 and closes the first inlet valve 1 according to the speed in S4;

[0126] S6: the remote operator closes the first smoke exhaust fan 3, the outlet linkage motor 9 closes the first outlet valve 2, and the switching fan operation is completed.

[0127] Example 11

[0128] S1: open the first smoke exhaust fan 3 and the second smoke exhaust fan 6;

[0129] S2: when the frequency of the second smoke exhaust fan 6 and the first smoke exhaust fan 3 is the same, that is, 25 HZ, click the inner switching button of the control module to start;

[0130] S3: the outlet linkage motor 9 controls the second outlet valve 5 to be fully opened;

[0131] S4: the actual detection value of the furnace pressure is 25 Mpa, the target set value of the furnace pressure is 20 Mpa; the difference between the actual detection value and the target set value of the furnace pressure is 5 Mpa; the speed difference between the opening of the second inlet valve 4 and the closing of the first inlet valve 1 is given according to the difference value, which is 5 S; the target set value of the furnace pressure is less than the actual detection value of the furnace pressure, and the opening speed of the second inlet valve 4 is less than the closing speed of the first inlet valve 1; the opening speed of the second inlet valve 4 is 10 S, and the closing speed of the first inlet valve 1 is 15 S;

[0132] S5: the inlet linkage motor 8 synchronously opens the second inlet valve 4 and closes the first inlet valve 1 according to the speed in S4;

[0133] S6: the remote operator closes the first smoke exhaust fan 3, the outlet linkage motor 9 closes the first outlet valve 2, and the switching fan operation is completed.

[0134] Compared with the prior art, the application adds an inlet linkage motor, an outlet linkage motor and a control module, transmits instructions to the control module, and executes the instructions by the inlet and outlet linkage motors; through the working method of the automatic switching device, the risk of pressure fluctuation in the furnace during switching is reduced, the switching method is simple to operate, high in consistency, good in completeness, stable in furnace pressure and safe and controllable in process.

[0135] The above is only used for describing the technical idea of the application, and cannot be used to limit the protection scope of the application. Any modification made according to the technical idea of the application on the basis of the technical scheme falls within the protection scope of the claims of the application.

Claims

1. A TFT substrate glass kiln exhaust fan automatic switching method, characterized by, It comprises the following steps: S1: turn on the first exhaust fan (3) and the second exhaust fan (6); S2: when the second exhaust fan (6) and the first exhaust fan (3) have the same frequency, click the inner switching button of the starting control module; the second motor controls the second outlet valve (5) to be fully opened; S3: obtain the speed of opening the second inlet valve (4) and closing the first inlet valve (1); S4: the first motor synchronously opens the second inlet valve (4) and closes the first inlet valve (1) according to the speed in S3; S5: the remote operator closes the first exhaust fan (3), and the second motor closes the first outlet valve (2), and the switching fan operation is completed; In S3, the way to obtain the speed of opening the second inlet valve (4) and closing the first inlet valve (1) is: obtaining the difference between the actual detection value of the furnace pressure and the target set value of the furnace pressure, and giving the speed of opening one inlet and closing the other inlet valve according to the difference; The difference between the actual detection value of the furnace pressure and the target set value of the furnace pressure is equal to the difference in the speed of opening one inlet and closing the other inlet valve; the difference in the speed of opening one inlet and closing the other inlet valve is ≤5S; The TFT substrate glass kiln exhaust fan automatic switching device comprises parallel first exhaust duct and second exhaust duct; the first exhaust duct is sequentially provided with first inlet valve (1), first exhaust fan (3), first outlet valve (2); the second exhaust duct is sequentially provided with second inlet valve (4), second exhaust fan (6), second outlet valve (5); The first inlet valve (1) and the second inlet valve (4) are connected with the first motor; the first outlet valve (2) and the second outlet valve (5) are connected with the second motor; The first motor and the second motor are connected with the control module; The first motor is an inlet linkage motor (8); the second motor is an outlet linkage motor (9); The inlet linkage motor (8) and the outlet linkage motor (9) drive the same opening degree adjusting valve.

2. The method according to claim 1, wherein the method is characterized by: The control module is connected with the DCS control system.

3. The method according to claim 1, wherein the method is characterized by: The gas inlet of the first exhaust duct and the second exhaust duct is connected with the treated flue gas inlet (7).

4. The method for automatically switching the exhaust fan of a TFT substrate glass kiln according to claim 1, characterized in that, The gas outlet of the first exhaust duct and the second exhaust duct is connected with the chimney (10).

5. The method for automatically switching the exhaust fan of a TFT substrate glass kiln according to claim 1, characterized in that, The target set value of the furnace pressure is 20Mpa; the actual detection value of the furnace pressure is 15~25Mpa.

6. The method for automatically switching the exhaust fan of a TFT substrate glass kiln according to claim 1, characterized in that, When the actual detection value of the furnace pressure is less than the target set value of the furnace pressure, the inlet valve opening speed is greater than the original inlet valve closing speed; When the actual detection value of the furnace pressure is equal to the target set value of the furnace pressure, the inlet valve opening speed is equal to the original inlet valve closing speed; When the actual detection value of the furnace pressure is greater than the target set value of the furnace pressure, the inlet valve opening speed is less than the original inlet valve closing speed.

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