A method for protecting the hydraulic circuit during the rising process of the heating furnace door

Abstract

The present invention discloses a method for protecting the hydraulic circuit action during the rising process of a heating furnace door, including analyzing the rod cavity pressure value K1 during the hydraulic action of the furnace door according to the data collected by the PDA background, the furnace door action time T1 during the half-open rising process of the furnace door, the furnace door from half-open to fully open process time T2, and the furnace door fully open rising process time T3 from the lower limit position detection to the upper position stop; programming is performed according to the above data, and the furnace door hydraulic interlocking function is designed, and the furnace door hydraulic interlocking function is designed in the operating table HMI screen, which can effectively alarm when a fault occurs, and at the same time prompt the maintenance personnel to check whether there is a proximity switch fault or a hydraulic circuit blockage, a valve station blockage, etc.; after the fault processing is completed, the reset operation is performed, and the production is resumed on site. The advantage of the present invention is that it effectively avoids the furnace door from being out of control due to excessive vibration, blockage of the hydraulic cylinder or hydraulic circuit and valve body failure during the rising process of the furnace door, and improves the safety of on-site equipment and personnel.

Description

Technical Field

[0001] The invention belongs to the technical field of steel rolling equipment, and in particular relates to a method for protecting the action of a hydraulic circuit during the rising process of a heating furnace door. Background Art

[0002] At present, the hydraulic lifting furnace door of the medium plate plant is divided into two left and right furnace doors, each with a set of hydraulically driven lifting mechanism. The furnace door is connected to the lifting cylinder piston rod through a chain. During the lifting process of the furnace door, the solenoid valve is activated, the rod cavity enters oil, and the rodless cavity returns oil, then the furnace door rises, and the rodless cavity enters oil, and the rod cavity returns oil, then the furnace door descends. The upper, middle and lower limit positions of the furnace door are detected by the proximity switch. The furnace door operation is divided into three control modes: local operation box, remote operation table, and remote automatic. The furnace door can be divided into two modes: half-open and fully open depending on the proximity switch action.

[0003] During the operation of the hydraulic lifting furnace door, the proximity switch of the detection element often fails to contact the stop iron due to pipeline vibration, or the proximity switch becomes loose and slides down due to vibration. During the operation of the furnace door, problems such as pressure sensor, limit failure, valve body failure, hydraulic circuit blockage, etc. cause continuous hydraulic pressure to cause equipment failure and stop, posing a safety hazard. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of many faults and safety hazards in the operation of existing hydraulic lifting furnace doors, and to provide a method for protecting the hydraulic circuit action during the rising process of the heating furnace door, which can effectively avoid the furnace door from losing control due to excessive vibration, blockage or valve body failure of the hydraulic cylinder or hydraulic circuit during the rising process, thereby improving the safety of on-site equipment and personnel.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for protecting the hydraulic circuit during the rising process of a heating furnace door, the specific steps are as follows, including:

[0007] (1) According to the data collected by PDA background, the rod cavity pressure value K1 during the hydraulic action of the furnace door, the furnace door action time T1 during the half-open rising process of the furnace door, the time taken for the furnace door to move from half-open to fully open T2, and the time taken for the furnace door to move from the lower position to the upper position during the fully open rising process T3;

[0008] (2) According to the above data, programming is performed to design the furnace door hydraulic interlocking function. The timing starts from the furnace door rising action. If the rising process has not reached the corresponding detection position within the time limit, the furnace door is prohibited from continuing to rise and an alarm is issued. During the furnace door rising process, if the rod chamber pressure is too low, the furnace door is prohibited from moving, the valve group is powered off, and the hydraulic station stops the pump to avoid fire and other safety hazards caused by oil cylinder leakage;

[0009] (3) The furnace door hydraulic interlock function is designed into the operating console HMI screen, which can effectively alarm when a fault occurs and prompt maintenance personnel to check whether there is a proximity switch fault or a hydraulic circuit blockage or valve station blockage;

[0010] (4) Fault reset: After the fault is resolved, the operator performs reset operations on the screen and console to resume production on site.

[0011] Furthermore, in the step (1), when the furnace door is hydraulically actuated, the rod chamber pressure value K1 is not less than 7 MPa.

[0012] Furthermore, in the step (1), during the process of the furnace door being half-opened and rising, the time T1 for the furnace door to move does not exceed 10 seconds.

[0013] Furthermore, in step (1), the time T2 taken for the furnace door to be opened from half to fully open does not exceed 6 seconds.

[0014] Furthermore, in the step (1), the time T3 taken for the entire process of the furnace door rising from the lower position to the upper position when the furnace door is fully opened does not exceed 16 seconds.

[0015] Furthermore, in step (2), after the furnace door hydraulic interlock function is put into use, if the furnace door rises to the middle position within time t1, the system is normal; otherwise, the furnace door is prohibited from rising and an alarm is issued, wherein t1 is the maximum time taken for the furnace door to be half-open, that is, the maximum value of T1 is taken.

[0016] Furthermore, in step (2), after the furnace door hydraulic interlock function is put into use, if the furnace door rises to the upper position within time t2, the system is normal; otherwise, the furnace door is prohibited from rising and an alarm is sounded. If the furnace door is fully opened directly from the low position, t2 takes the maximum value of T3; if the furnace door is fully opened from half open, t2 takes the maximum value of T2.

[0017] Furthermore, in the step (2), after the furnace door hydraulic interlocking function is put into use, if the furnace door rod chamber pressure is greater than k3, the system is normal; otherwise, the furnace door is prohibited from rising and an alarm is sounded, wherein k3 takes the minimum value of K1.

[0018] In the technical solution of the present invention, by designing the furnace door hydraulic interlocking function, it is possible to accurately control and promptly detect faults in the furnace door rising process, thereby reducing the equipment failure rate, improving production safety and personnel safety, reducing safety hazards, and effectively avoiding the furnace door loss of control caused by excessive vibration and blockage of the hydraulic cylinder or hydraulic circuit and valve body failure during the furnace door rising process, thereby improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a flow chart of the hydraulic circuit action protection method of the present invention;

[0020] Figure 2 The figure is a computer operation interface diagram of the present invention in actual application. DETAILED DESCRIPTION

[0021] To make the present invention more clear, a method for protecting the hydraulic circuit during the rising process of a heating furnace door of the present invention is further described below in conjunction with the accompanying drawings. The specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0022] See also Figure 1 A method for protecting the hydraulic circuit during the rising process of a heating furnace door, the specific steps are as follows, characterized in that it includes:

[0023] (1) According to the analysis of the data collected by the PDA background, when the furnace door is hydraulically actuated, the rod chamber pressure value K1 is not less than 7 MPa. During the process of the furnace door being half-opened and rising, the furnace door action time T1 does not exceed 10 seconds, the furnace door from half-open to fully open process T2 does not exceed 6 seconds, and during the process of the furnace door being fully opened and rising, the furnace door from the lower position to the upper position The whole process of rising takes T3 does not exceed 16 seconds;

[0024] (2) According to the above data, program and design the furnace door hydraulic interlock function. If the furnace door rises to the middle position within t1, the system is normal. Otherwise, the furnace door is prohibited from rising and an alarm is sounded. Among them, t1 is the maximum time of the furnace door half-open, which is 10s. If the furnace door rises to the upper position within t2, the system is normal. Otherwise, the furnace door is prohibited from rising and an alarm is sounded. Among them, if the furnace door is fully opened directly from the low position, t2 is 16s. If the furnace door is fully opened from half-open, t2 is 6s. If the furnace door has a rod cavity pressure greater than k3, the system is normal. Otherwise, the furnace door is prohibited from rising and an alarm is sounded. Among them, k3 is 7Mpa.

[0025] (3) The furnace door hydraulic interlock function is designed into the operating console HMI screen, which can effectively alarm when a fault occurs and prompt maintenance personnel to check whether there is a proximity switch fault or hydraulic circuit blockage, valve table blockage, etc.;

[0026] (4) Fault reset: After the fault is resolved, the operator performs reset operations on the screen and console to resume production on site.

[0027] See also Figure 2 , the interlock protection function is put into use on the HMI screen. The system starts timing from the furnace door rising action. If the rising process has not reached the corresponding detection position within the time limit, the furnace door is prohibited from continuing to rise and an alarm is issued. During the furnace door rising process, if the rod chamber pressure is too low, the furnace door is prohibited from moving, and the valve group is powered off and the hydraulic station stops pumping to avoid fire and other safety hazards caused by oil cylinder leakage; according to different situations, the corresponding alarm prompt will pop up on the HMI screen; notify maintenance personnel to check and handle; finally, the fault is reset and production is resumed.

[0028] The method of the present invention effectively reduces the equipment failure rate, increases benefits, and reduces safety risks. For example, in 2021, the medium plate plant of Nanjing Iron and Steel Co., Ltd. was downtime of 24 hours due to the failure of the furnace door hydraulic system. According to the machine hourly output of 245 tons / hour and the profit per ton of steel of 300 yuan, it is calculated as follows:

[0029] The benefit is 300*245*24=1.764 million.

[0030] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A method for protecting the hydraulic circuit during the rising process of a heating furnace door, the specific steps are as follows, characterized in that: include: (1) According to the data collected by PDA background, the rod cavity pressure value K1 during the hydraulic action of the furnace door, the furnace door action time T1 during the half-open rising process of the furnace door, the time taken for the furnace door to move from half-open to fully open T2, and the time taken for the furnace door to move from the lower position to the upper position during the fully open rising process T3; (2) According to the above data, programming is performed to design the furnace door hydraulic interlocking function. The timing starts from the furnace door rising action. If the rising process has not reached the corresponding detection position within the time limit, the furnace door is prohibited from continuing to rise and an alarm is issued. During the furnace door rising process, if the rod chamber pressure is too low, the furnace door is prohibited from moving, the valve group is powered off, and the hydraulic station stops the pump to avoid fire caused by oil cylinder leakage; (3) The furnace door hydraulic interlock function is designed into the operating console HMI screen, which can effectively alarm when a fault occurs and prompt maintenance personnel to check whether there is a proximity switch fault or a hydraulic circuit blockage or valve station blockage; (4) Fault reset: After the fault is resolved, the operator performs reset operations on the screen and console to resume production on site.

2. The method for protecting the hydraulic circuit during the rising process of the heating furnace door according to claim 1 is characterized in that: In the step (1), when the furnace door is hydraulically actuated, the rod chamber pressure value K1 is not less than 7 MPa.

3. The method for protecting the hydraulic circuit during the rising process of the heating furnace door according to claim 1 or 2, characterized in that: In the step (1), during the process of the furnace door being half-opened and rising, the time T1 for the furnace door to move does not exceed 10 seconds.

4. The method for protecting the hydraulic circuit during the rising process of the heating furnace door according to claim 1 or 2, characterized in that: In the step (1), the time T2 taken for the furnace door to be opened from half to fully is no more than 6 seconds.

5. The method for protecting the hydraulic circuit action during the rising process of the heating furnace door according to claim 1 or 2, characterized in that: In the step (1), the time T3 for the entire process of the furnace door rising from the lower position to the upper position when the furnace door is fully opened does not exceed 16 seconds.

6. The method for protecting the hydraulic circuit during the rising process of the heating furnace door according to claim 1 or 2, characterized in that: In the step (2), after the furnace door hydraulic interlock function is put into use, if the furnace door rises to the middle position within time t1, the system is normal; otherwise, the furnace door is prohibited from rising and an alarm is sounded, wherein t1 is the maximum time taken for the furnace door to be half-open, that is, the maximum value of T1 is taken.

7. The method for protecting the hydraulic circuit during the rising process of the heating furnace door according to claim 1 or 2, characterized in that: In the step (2), after the furnace door hydraulic interlocking function is put into use, if the furnace door rises to the upper position within time t2, the system is normal; otherwise, the furnace door is prohibited from rising and an alarm is sounded. If the furnace door is fully opened directly from the low position, t2 takes the maximum value of T3; if the furnace door is fully opened from half open, t2 takes the maximum value of T2.

8. The method for protecting the hydraulic circuit action during the rising process of the heating furnace door according to claim 1 or 2, characterized in that: In the step (2), after the furnace door hydraulic interlocking function is put into use, if the furnace door rod chamber pressure is greater than k3, the system is normal, otherwise the furnace door is prohibited from rising and an alarm is sounded, wherein k3 takes the minimum value of K1.

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