Hydraulic control loop and steelmaking cover skirt device

Abstract

The utility model discloses a hydraulic control loop and a steelmaking cover skirt device, and relates to the technical field of steelmaking equipment control, the hydraulic control loop comprises a plurality of hydraulic cylinders, an oil tank, a first reversing valve and a flow distribution cylinder, an oil inlet of the first reversing valve is communicated with the oil supply way, an oil outlet of the first reversing valve is communicated with the oil return way, the first working oil port is communicated with rodless cavities of the hydraulic cylinders, the flow distribution cylinder comprises a cylinder body and a piston rod, the cylinder body is provided with a plurality of cavities which are sequentially arranged, the piston rod comprises a rod part and a plurality of pistons, the rod part movably penetrates through the cylinder body, and the pistons are arranged in the cavities. A plurality of cavities are formed in the pistons in a one-to-one mode, each cavity is divided into a first cavity and a second cavity by the corresponding piston, the first cavities of the cavities communicate with the second working oil port of the first reversing valve, and the second cavities of the cavities communicate with rod cavities of the hydraulic cylinders in a one-to-one correspondence mode. By means of the loop, synchronous ascending and synchronous descending of the piston rods of the hydraulic cylinders are achieved, and the synchronism and stability of the cover skirt during movement are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steelmaking equipment control, in particular to a hydraulic control circuit and a steelmaking skirt device. Background Art

[0002] The steelmaking skirt device is an important part of steel smelting equipment. It includes a skirt installed above the converter at intervals and multiple hydraulic cylinders connected to the skirt drive. The multiple hydraulic cylinders are controlled by a hydraulic control circuit.

[0003] In traditional steelmaking skirt devices, it is difficult to achieve synchronous operation of multiple hydraulic cylinders, and skirt scratching accidents are prone to occur, which has a great impact on production. Utility Model Content

[0004] The present application provides a hydraulic control circuit and a steelmaking skirt device, which solves the technical problem in the prior art of difficulty in achieving operational synchronization of multiple hydraulic cylinders driven by the skirt.

[0005] The present application provides a hydraulic control circuit for driving a cover skirt spaced above a converter. The hydraulic control circuit includes multiple hydraulic cylinders, an oil tank, a first reversing valve and a flow distribution cylinder. The multiple hydraulic cylinders are all connected to the cover skirt drive. The oil tank is spaced from the hydraulic cylinder. The oil tank is connected to an oil supply oil circuit and an oil return oil circuit. The oil inlet of the first reversing valve is connected to the oil supply oil circuit, the oil outlet of the first reversing valve is connected to the oil return oil circuit, the first working oil port of the first reversing valve is connected to the rodless chambers of the multiple hydraulic cylinders, the flow distribution cylinder includes a cylinder body and a piston rod, and the cylinder body is provided with an oil supply oil circuit. Multiple chambers are arranged in sequence along the axial direction of the piston rod, and the volume of each chamber is equal. The piston rod includes a rod portion and multiple pistons connected to the rod portion. The rod portion is movably arranged in the cylinder body. Multiple pistons are arranged in a one-to-one correspondence with multiple chambers. The pistons are arranged in the corresponding chambers and the chambers are divided into a first chamber and a second chamber by the pistons. The volume of the first chamber of each chamber is equal. The first chambers of the multiple chambers are all connected to the second working oil port of the first reversing valve. The second chambers of the multiple chambers are arranged in a one-to-one correspondence with the rod chambers of the multiple hydraulic cylinders, and the second chambers are connected to the corresponding rod chambers.

[0006] In some embodiments, the hydraulic control circuit includes:

[0007] a first one-way throttle valve installed in the oil circuit connecting the first chamber to the second working oil port, wherein the oil inlet of the one-way valve of the first one-way throttle valve is connected to the second working oil port, and the oil outlet of the one-way valve of the first one-way throttle valve is connected to the first chamber;

[0008] A hydraulically controlled one-way valve, the oil inlet of the hydraulically controlled one-way valve is connected to the rodless chambers of multiple hydraulic cylinders, the oil outlet of the hydraulically controlled one-way valve is connected to the oil inlet of the one-way valve of the first one-way throttle valve, and the control oil port of the hydraulically controlled one-way valve is connected to the first working oil port.

[0009] In some embodiments, the hydraulic control circuit includes:

[0010] a first one-way valve installed in the oil path connecting the first chamber to the second working oil port, wherein the oil inlet of the first one-way valve is connected to the second working oil port, and the oil outlet of the first one-way valve is connected to the first chamber;

[0011] The hydraulic cylinder is arranged vertically, and the rod cavity of the hydraulic cylinder is located below the rodless cavity.

[0012] In some embodiments, the hydraulic control circuit includes:

[0013] a first position switch, spaced apart from the piston rod of the flow distribution cylinder, for issuing a signal when the piston rod of the flow distribution cylinder moves to a point where the first chamber is at a minimum allowable value;

[0014] The controller is connected to the first position switch signal. The first reversing valve is a solenoid valve. The controller is control-connected to the first reversing valve. The controller is used to control the first reversing valve to change position after receiving the signal from the first position switch.

[0015] In some embodiments, the hydraulic control circuit includes:

[0016] a second reversing valve, wherein the oil inlet of the second reversing valve is connected to the second working oil port, the oil outlet of the second reversing valve is connected to the oil return line, and the working oil port of the second reversing valve is connected to the rod chambers of the plurality of hydraulic cylinders;

[0017] At least one second one-way valve is installed in the oil circuit connecting the working oil port of the second reversing valve to the rod chamber of the hydraulic cylinder. The oil inlet of the second one-way valve is connected to the working oil port of the second reversing valve, and the oil outlet of the second one-way valve is connected to the rod chamber of the hydraulic cylinder.

[0018] In some embodiments, the hydraulic control circuit includes:

[0019] A plurality of pressure sensors corresponding one to each of the plurality of hydraulic cylinders, wherein a measuring end of the pressure sensor is disposed in an oil circuit connected to a rod cavity of the corresponding hydraulic cylinder, and the pressure sensor is used to detect the hydraulic pressure of the rod cavity of the corresponding hydraulic cylinder;

[0020] a second position switch, spaced apart from the piston rod of the flow distribution cylinder, for issuing a signal when the piston rod of the flow distribution cylinder moves to a point where the second chamber is at a minimum allowable value;

[0021] The controller is signal-connected to multiple pressure sensors, the controller is signal-connected to the second position switch, the second reversing valve is a solenoid valve, the controller is control-connected to the second reversing valve, and the controller is used to control the second reversing valve to change position after receiving the signal from the second position switch.

[0022] In some embodiments, the hydraulic control circuit includes:

[0023] a third reversing valve, wherein a working oil port of the third reversing valve is connected to the second chambers of the plurality of chambers, and an oil outlet of the third reversing valve is connected to the oil return line;

[0024] At least one third one-way valve is installed in the oil path connecting the working oil port of the third reversing valve to the second chamber, the oil inlet of the third one-way valve is connected to the second chamber, and the oil outlet of the third one-way valve is connected to the working oil port of the third reversing valve;

[0025] The controller is connected to the third reversing valve for controlling the position change of the third reversing valve after receiving the signal from the second position switch.

[0026] In some embodiments, the hydraulic control circuit includes a fourth reversing valve, an oil inlet of the fourth reversing valve is connected to the oil supply oil circuit, an oil outlet of the fourth reversing valve is connected to the oil return oil circuit, and a working oil port of the fourth reversing valve is connected to the first chambers of the plurality of chambers.

[0027] The oil outlet of the second one-way valve is also communicated with the second chamber, and another working oil port of the fourth reversing valve is communicated with the oil inlet of the second one-way valve.

[0028] In some embodiments, the hydraulic control circuit includes:

[0029] The first flow regulating valve is installed between the oil inlet of the first reversing valve and the oil supply line.

[0030] In some embodiments, the hydraulic control circuit includes:

[0031] The second flow regulating valve is installed in the oil path where the working oil port of the third reversing valve is connected to the second chamber.

[0032] A steelmaking skirt device comprises a skirt and the above-mentioned hydraulic control circuit. The skirt is arranged above the converter at intervals, and multiple hydraulic cylinders of the hydraulic control circuit are all drivingly connected to the skirt.

[0033] The beneficial effects of the present application are as follows: a hydraulic control circuit is provided, including multiple hydraulic cylinders, an oil tank, a first reversing valve and a flow distribution cylinder, and the hood skirt must be driven by multiple hydraulic cylinders; when the oil enters the multiple first chambers of the flow distribution cylinder along the oil supply line through the second working oil port of the first reversing valve, the hydraulic oil pushes the piston rod to move along the cylinder body, and the oil in the multiple second chambers respectively enters the rod chambers of the multiple hydraulic cylinders, and the flow distribution cylinder ensures that the oil output of the multiple second chambers is uniform, pushing the piston rod of the hydraulic cylinder to retract, so that the hood skirt connected to the piston rod of the hydraulic cylinder moves up, which is the hood skirt lifting process; when the oil The oil in the rod chamber of the hydraulic cylinder is returned to the second chamber of the flow distribution cylinder, and the oil in the rod chamber of the hydraulic cylinder returns to the second chamber of the flow distribution cylinder. This is the process of the skirt descending. The present application realizes the synchronous rise and fall of the piston rods of multiple hydraulic cylinders by adding a flow distribution cylinder, thereby improving the synchronization of the skirt movement, making the movement process of the skirt run smoothly, improving the stability of the skirt movement, improving the skirt scratching accidents, and ensuring the smooth progress of steel production. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention.

[0035] Figure 1 A schematic diagram of a hydraulic control circuit provided in this application.

[0036] Figures marked: 1-fourth reversing valve, 2-first reversing valve, 3-third reversing valve, 4-second reversing valve, 5-first flow regulating valve, 6-first one-way throttle valve, 7-second flow regulating valve, 8-hydraulic one-way valve, 9-flow distribution cylinder, 91-cylinder body, 911-first chamber, 912-second chamber, 92-piston rod, 921-rod, 922-piston, 10-first hydraulic cylinder, 11-second hydraulic cylinder, 12-third hydraulic cylinder, 13-fourth hydraulic cylinder, 14 -First pressure sensor, 15-Second pressure sensor, 16-Third pressure sensor, 17-Fourth pressure sensor, 18-Fifth pressure sensor, 19-First position switch, 20-Second position switch, 21-Hydraulic lock, 22-Superimposed double one-way throttle valve, 23-Pressure reducing valve, 24-First relief valve, 25-Second relief valve, 26-First one-way valve, 27-Second one-way valve, 28-Third one-way valve, P-Oil supply line, T-Oil return line, L-Oil unloading circuit. DETAILED DESCRIPTION

[0037] This application provides a hydraulic control circuit for controlling the skirt in a steelmaking skirt device. The skirt is spaced apart above the converter and requires lifting and lowering motion during the steelmaking process, providing protection for workers. The hydraulic control circuit includes multiple hydraulic cylinders, each of which is drivably connected to the skirt. Specifically, the piston rods 92 of each hydraulic cylinder are connected to the skirt. Due to the specifications of the skirt, the number of hydraulic cylinders is limited to at least three. Figure 1 The multiple hydraulic cylinders are respectively a first hydraulic cylinder 10, a second hydraulic cylinder 11, a third hydraulic cylinder 12 and a fourth hydraulic cylinder 13.

[0038] Please refer to Figure 1 The hydraulic control circuit includes multiple hydraulic cylinders, an oil tank, a first reversing valve 2, and a flow distribution cylinder 9. The hydraulic cylinders are arranged vertically, with the rod chamber located below the rodless chamber. When the piston rod 92 of the hydraulic cylinder extends, the skirt descends toward the converter; when the piston rod 92 retracts, the skirt ascends away from the converter.

[0039] Please refer to Figure 1 The oil tank is separated from the hydraulic cylinder and is connected to the oil supply line P and the oil return line T. The oil inlet of the first reversing valve 2 is connected to the oil supply line P, and the oil outlet of the first reversing valve 2 is connected to the oil return line T. The first working oil port of the first reversing valve 2 is connected to the rodless chambers of multiple hydraulic cylinders. The first reversing valve 2 is also provided with a second working oil port. Figure 1 As shown, when the first reversing valve 2 is in Figure 1 When the first reversing valve 2 is in the left position, the oil inlet of the first reversing valve 2 is connected with the first working oil port, and the oil outlet is connected with the second working oil port; when the first reversing valve 2 is in the left position Figure 1 When the oil inlet of the first reversing valve 2 is in the right position, the oil inlet is connected to the second working oil port, and the oil outlet is connected to the first working oil port.

[0040] Please refer to Figure 1The flow distribution cylinder 9 includes a cylinder body 91 and a piston rod 92. The cylinder body 91 is provided with a plurality of chambers arranged in sequence along the axial direction of the piston rod 92. The piston rod 92 includes a rod portion 921 and a plurality of pistons 922 connected to the rod portion 921. The rod portion 921 is movably arranged in the cylinder body 91. The plurality of pistons 922 are arranged in a one-to-one correspondence with the plurality of chambers. The pistons 922 are arranged in the corresponding chambers and the chambers are divided into a first chamber 911 and a second chamber 912 by the pistons 922. It can be understood that when the rod portion 921 drives the piston 922 to move in the chamber, the volumes of the first chamber 911 and the second chamber 912 both change, but the sum of the volumes of the first chamber 911 and the second chamber 912 to which each chamber belongs remains unchanged. It is defined that the volume of each chamber is equal, and the volume of each first chamber 911 is also equal. The first chambers 911 of the multiple chambers are all connected to the second working oil port of the first reversing valve 2, and the second chambers 912 of the multiple chambers are arranged in a one-to-one correspondence with the rod chambers of the multiple hydraulic cylinders, and the second chambers 912 are connected to the corresponding rod chambers.

[0041] when Figure 1 The b end of the first reversing valve 2 is energized, and the first reversing valve 2 is in Figure 1 In the right position, the oil inlet of the first reversing valve 2 is connected to the second working oil port, and the oil enters the multiple first chambers 911 of the flow distribution cylinder 9 through the second working oil port of the first reversing valve 2 along the oil supply line P. The hydraulic oil pushes the piston rod 92 to move along the cylinder body 91, and the oil in the multiple second chambers 912 respectively enters the rod chambers of the multiple hydraulic cylinders, pushing the piston rod 92 of the hydraulic cylinder to retract, so that the skirt connected to the piston rod 92 of the hydraulic cylinder moves upward. This is the skirt lifting process, and the oil in the rodless chamber of the hydraulic cylinder returns to the oil tank through the return oil line T, and the oil output of the multiple second chambers 912 is guaranteed to be uniform through the flow distribution cylinder 9.

[0042] when Figure 1 The a end of the first reversing valve 2 in the circuit is energized, and the first reversing valve 2 is in Figure 1 In the left position, the oil inlet of the first reversing valve 2 is connected to the first working oil port, and the oil enters the rodless chambers of multiple hydraulic cylinders along the oil supply line P through the first working oil port of the first reversing valve 2, pushing the piston rod 92 of the hydraulic cylinder to extend, so that the skirt connected to the piston rod 92 of the hydraulic cylinder descends. This is the process of the skirt descending. The oil in the rod chamber of the hydraulic cylinder returns to the multiple second chambers 912 of the flow distribution cylinder 9, pushing the piston rod 92 of the flow distribution cylinder 9 to move.

[0043] This application realizes the synchronous rise and fall of the piston rods 92 of multiple hydraulic cylinders by adding a flow distribution cylinder 9, thereby improving the synchronization of the cover skirt movement, making the movement process of the cover skirt run smoothly, improving the stability of the cover skirt movement, improving the cover skirt scratching accidents, and ensuring smooth steel production.

[0044] During the descent of the skirt, the piston rod 92 of the flow distribution cylinder 9 moves, causing multiple first chambers 911 to discharge oil. The oil output from the first chamber 911 can be selected to return to the oil tank along the oil outlet of the first reversing valve 2, or other methods can be used.

[0045] In some embodiments, see Figure 1 , the hydraulic control circuit includes a first one-way throttle valve 6 and a hydraulically controlled one-way valve 8. The first one-way throttle valve 6 is installed in the oil circuit connected to the second working oil port from the first chamber 911. The oil inlet of the one-way valve of the first one-way throttle valve 6 is connected to the second working oil port, and the oil outlet of the one-way valve of the first one-way throttle valve 6 is connected to the first chamber 911. The oil inlet of the hydraulically controlled one-way valve 8 is connected to the rodless chambers of multiple hydraulic cylinders, the oil outlet of the hydraulically controlled one-way valve 8 is connected to the oil inlet of the one-way valve of the first one-way throttle valve 6, and the control oil port of the hydraulically controlled one-way valve 8 is connected to the first working oil port. During the descent of the hood skirt, the first reversing valve 2 is in Figure 1 In the left position, the oil in the rod chamber of the hydraulic cylinder returns to the multiple second chambers 912 of the flow distribution cylinder 9, pushing the piston rod 92 of the flow distribution cylinder 9 to move, causing the multiple first chambers 911 of the flow distribution cylinder 9 to discharge oil. The oil flows through the throttle valve of the first one-way throttle valve 6 to the hydraulic control one-way valve 8. At this time, hydraulic oil is input to the control oil port of the hydraulic control one-way valve 8. The oil output from the first chamber 911 can flow from the oil outlet of the hydraulic control one-way valve 8 to the oil inlet of the hydraulic control one-way valve 8, and then return to the rodless chambers of the multiple hydraulic cylinders, forming a differential circuit and improving the smoothness of the cover skirt during movement. The descent speed of the cover skirt is controlled by adjusting the throttle valve of the first one-way throttle valve 6.

[0046] In the scheme in which the first one-way throttle valve 6 and the hydraulically controlled one-way valve 8 are provided, during the process of lifting the skirt, the oil flows to the first one-way throttle valve 6 through the second working oil port of the first reversing valve 2, and flows to the multiple first chambers 911 of the flow distribution cylinder 9 through the one-way valve of the first one-way throttle valve 6. At this time, the throttle valve of the first one-way throttle valve 6 does not play a regulating role.

[0047] In some embodiments, see Figure 1 The hydraulic control circuit includes a first one-way valve 26, which is installed in the oil circuit connecting the first chamber 911 to the second working oil port. The oil inlet of the first one-way valve 26 is connected to the second working oil port, and the oil outlet of the first one-way valve 26 is connected to the first chamber 911. Figure 1 As shown, when the first reversing valve 2 is in the middle position, the oil inlet of the first reversing valve 2 is in a cut-off state, the hydraulically controlled one-way valve 8 and the first one-way valve 26 both prevent the oil from flowing, the oil in the first chamber 911 of the flow distribution cylinder 9 cannot flow out, and the oil in the rod chamber of the hydraulic cylinder cannot flow out, so that the skirt is in a stopped state. Figure 1When the a-end and the b-end of the first reversing valve 2 lose power, the neutral state of the first reversing valve 2 cooperates with the first one-way valve 26, so that the skirt can be stopped at any position.

[0048] In some embodiments, the hydraulic control circuit includes a first position switch 19 and a controller. Figure 1 , spaced from the piston rod 92 of the flow distribution cylinder 9. The first position switch 19 is used to detect the position of the piston rod 92 of the flow distribution cylinder 9. The controller is connected to the first position switch 19 for signals and is control-connected to the first reversing valve 2. The first reversing valve 2 is a solenoid valve, and the controller can control the operating position of the first reversing valve 2. When the piston rod 92 of the flow distribution cylinder 9 moves to the point where the first chamber 911 is at its minimum allowable value, the first position switch 19 sends a signal, indicating that the second chamber 912 is at its maximum allowable value. The oil entering the second chamber 912 from the rod chamber of the hydraulic cylinder is at its maximum amount, indicating that the piston rod 92 of the hydraulic cylinder is at its lowest position. At this time, the skirt is at its lowest position. When the first position switch 19 sends a signal, the skirt is at its lowest position. The controller receives the signal from the first position switch 19 and controls the first reversing valve 2 to shift positions, causing the skirt to stop descending.

[0049] In some embodiments, see Figure 1 The hydraulic control circuit includes a second reversing valve 4 and at least one second check valve 27. The oil inlet of the second reversing valve 4 is connected to the second working oil port, and the oil outlet of the second reversing valve 4 is connected to the return oil circuit T. The working oil port of the second reversing valve 4 is connected to the rod chambers of multiple hydraulic cylinders. At least one second check valve 27 is installed in the oil circuit connecting the working oil port of the second reversing valve 4 to the rod chambers of the hydraulic cylinders. The oil inlet of the second check valve 27 is connected to the working oil port of the second reversing valve 4, and the oil outlet of the second check valve 27 is connected to the rod chambers of the hydraulic cylinders. There can be only one second check valve 27, and the oil entering the rod chambers of multiple hydraulic cylinders can be controlled by a single check valve. There can also be multiple second check valves 27, and the number of second check valves 27 is equal to the number of hydraulic cylinders, with each hydraulic cylinder being equipped with a second check valve 27 for control.

[0050] Please refer to Figure 1 In the scheme in which the second reversing valve 4 and the second one-way valve 27 are provided, when the skirt is lifted, the oil first flows through the first reversing valve 2 and the flow distribution cylinder 9 in sequence to the rod chamber of the hydraulic cylinder; when the piston rod 92 of the flow distribution cylinder 9 moves to the second chamber 912 and is at the minimum allowable value, the controller controls the second reversing valve 4 to shift, so that the oil passes through the first reversing valve 2, then flows through the second reversing valve 4, and enters the rod chamber of the hydraulic cylinder through the second one-way valve 27, so that the piston rod 92 of the hydraulic cylinder continues to rise, and the skirt continues to lift.

[0051] In some embodiments, see Figure 1 The hydraulic control circuit includes multiple pressure sensors and a second position switch 20. The second position switch 20 is spaced from the piston rod 92 of the flow distribution cylinder 9 and is used to detect the position of the piston rod 92 of the flow distribution cylinder 9. When the piston rod 92 of the flow distribution cylinder 9 moves to the minimum allowable value of the second chamber 912, the second position switch 20 issues a signal. The second reversing valve 4 is a solenoid valve. The controller is connected to the second reversing valve 4 for control and is also connected to the second position switch 20 for signal transmission. The controller controls the reversing position of the second reversing valve 4 upon receiving the signal from the second position switch 20.

[0052] Figure 1 The multiple pressure sensors are the second pressure sensor 15, the third pressure sensor 16, the fourth pressure sensor 17 and the fifth pressure sensor 18. Figure 1 Multiple pressure sensors correspond one-to-one to multiple hydraulic cylinders. The measuring ends of the pressure sensors are located in the oil circuits connected to the rod chambers of the corresponding hydraulic cylinders. The pressure sensors are used to detect the hydraulic pressure in the rod chambers of the corresponding hydraulic cylinders. When the piston rod 92 of the hydraulic cylinder rises to its highest position, the corresponding skirt is at its highest position, and the hydraulic pressure in the rod chambers increases significantly. The controller is connected to the multiple pressure sensors. The pressure sensors detect the hydraulic pressure in the rod chambers of the corresponding hydraulic cylinders and transmit the detection signals to the controller. The controller controls the first reversing valve 2 and the second reversing valve 4 to adjust them to a de-energized state. The cooperation between the pressure sensors and the controller improves the reliability of the skirt's operation.

[0053] Please refer to Figure 1 The hydraulic control circuit includes a first pressure sensor 14, which is used to connect the oil pressure of the oil supply circuit P.

[0054] In some embodiments, see Figure 1The hydraulic control circuit includes a third reversing valve 3 and at least one third check valve 28. The working oil port of the third reversing valve 3 is connected to the second chambers 912 of the plurality of chambers, and the oil outlet of the third reversing valve 3 is connected to the oil return line T. At least one third check valve 28 is installed in the oil circuit connecting the working oil port of the third reversing valve 3 to the second chamber 912. The oil inlet of the third check valve 28 is connected to the second chamber 912, and the oil outlet of the third check valve 28 is connected to the working oil port of the third reversing valve 3. There can be one third check valve 28, and the oil circuit connecting the working oil port of the third reversing valve 3 to the second chamber 912 is controlled by the third check valve 28. There can also be multiple third check valves 28, with the number of third check valves 28 being equal to the number of second chambers 912 of the flow distribution cylinder 9, and each third check valve 28 controls the oil output of each second chamber 912. The controller is connected to the third reversing valve 3 , and is configured to control the third reversing valve 3 to change position after receiving a signal from the second position switch 20 .

[0055] In the scheme where the third reversing valve 3 and the third one-way valve 28 are provided, the accumulated error of the hydraulic cylinder and the flow distribution cylinder 9 can be cleared. When the accumulated error needs to be cleared, the skirt rising action is performed first. Figure 1 When the b end of the first reversing valve 2 and the a end of the third reversing valve 3 are energized, the hydraulic oil flows along the oil supply line P through the first reversing valve 2 into the first chamber 911 of the flow distribution cylinder 9, pushing the piston rod 92 of the flow distribution cylinder 9 to move, and the oil in the second chamber 912 flows out and flows through the third one-way valve 28 to the third reversing valve 3. The oil returns to the oil tank along the return oil line T through the third reversing valve 3. Figure 1 When the piston rod 92 of the flow distribution cylinder 9 moves to the right to the maximum extent, the second chamber 912 is at the minimum allowable value, the piston rod 92 touches the second position switch 20, and the controller controls the third reversing valve 3 to lose power; at the same time, the a end of the second reversing valve 4 is energized, and the oil enters the rod chamber of the hydraulic cylinder through the first reversing valve 2 and the second reversing valve 4, pushing the piston rod 92 of the hydraulic cylinder to continue to move upward. When the piston rod 92 of the hydraulic cylinder moves upward to the highest position, the pressure sensor sends a signal, and the controller controls the first reversing valve 2 and the second reversing valve 4 to lose power, thus completing the upper limit clearing operation.

[0056] In some embodiments, the hydraulic control circuit includes a fourth reversing valve 1, see Figure 1 The oil inlet of the fourth reversing valve 1 is connected to the oil supply circuit P, the oil outlet of the fourth reversing valve 1 is connected to the oil return circuit T, and one working oil port of the fourth reversing valve 1 is connected to the first chamber 911 of the multiple chambers. The oil outlet of the second one-way valve 27 is also connected to the second chamber 912, and another working oil port of the fourth reversing valve 1 is connected to the oil inlet of the second one-way valve 27. The flow distribution cylinder 9 can also be flushed by using this hydraulic control circuit. Flushing the flow distribution cylinder 9 is divided into two processes, one is Figure 1 The piston rod 92 of the hydraulic cylinder of the middle flow distribution cylinder 9 is from left to right, and the other is Figure 1 The piston rod 92 of the hydraulic cylinder of the middle flow distribution cylinder 9 moves from right to left, and the two processes are combined to realize the forward and backwash of the flow distribution cylinder 9.

[0057] During the flushing process of the flow distribution cylinder 9, Figure 1 The a terminal of the fourth reversing valve 1 is energized. Figure 1 The a end of the third reversing valve 3 is energized, and the oil enters the first chamber 911 of the flow distribution cylinder 9 through the fourth reversing valve 1, pushing the piston rod 92 of the flow distribution cylinder 9 to move, so that the oil in the second chamber 912 flows to the third reversing valve 3 through the third one-way valve 28, and the oil returns to the oil tank along the return oil line T through the third reversing valve 3; when the piston rod 92 of the flow distribution cylinder 9 touches the second position switch 20, the second position switch 20 sends a signal, and the controller controls the fourth reversing valve 1 and the third reversing valve 3 to lose power.

[0058] During another flushing process of the flow distribution cylinder 9, Figure 1 The b end of the fourth reversing valve 1 is energized, and the oil flows through the fourth reversing valve 1 to the second one-way valve 27. The oil enters the second chamber 912 of the flow distribution cylinder 9 through the second one-way valve 27, pushing the piston rod 92 of the flow distribution cylinder 9 to move, so that the oil in the first chamber 911 returns to the oil tank along the return oil line T through the oil outlet of the fourth reversing valve 1; when the piston rod 92 of the flow distribution cylinder 9 touches the first position switch 19, the first position switch 19 sends a signal, and the controller controls the fourth reversing valve 1 to lose power.

[0059] The above two processes belong to a flushing cycle of the flow distribution cylinder 9. The flushing of the flow distribution cylinder 9 is completed through multiple flushing cycles.

[0060] In some embodiments, the hydraulic control circuit includes a first flow regulating valve 5, see Figure 1 The first flow regulating valve 5 is installed between the oil inlet of the first reversing valve 2 and the oil supply circuit P. The first flow regulating valve 5 can be a one-way throttle valve. The first flow regulating valve 5 can adjust the flow rate of the oil, and the moving speed of the skirt can be adjusted through the first flow regulating valve 5.

[0061] In some embodiments, the hydraulic control circuit includes a second flow regulating valve 7, see Figure 1 The second flow regulating valve 7 is installed in the oil circuit connecting the working oil port of the third reversing valve 3 to the second chamber 912, and the flow rate of the oil flowing through the third reversing valve 3 is regulated by the second flow regulating valve 7.

[0062] In some embodiments, see Figure 1The hydraulic control circuit includes a hydraulic lock 21, which is installed in an oil circuit connected to the working oil port of the fourth reversing valve 1.

[0063] In some embodiments, see Figure 1 The hydraulic control circuit includes a superimposed double one-way throttle valve 22, which is installed in the oil circuit connected to the working oil port of the fourth reversing valve 1. The superimposed double one-way throttle valve 22 plays a role in regulating the flow. The superimposed double one-way throttle valve 22 is mainly used in the flushing process of the flow distribution cylinder 9.

[0064] In some embodiments, see Figure 1 The hydraulic control circuit includes a pressure reducing valve 23 , which is installed in the oil circuit connected to the working oil port of the first reversing valve 2 .

[0065] In some embodiments, see Figure 1 The oil tank is connected to the oil unloading circuit L, the oil unloading port of the pressure reducing valve 23 is connected to the oil unloading circuit L, and the oil unloading port of the hydraulically controlled one-way valve 8 is connected to the oil unloading circuit L.

[0066] In some embodiments, see Figure 1 The hydraulic control circuit includes a first relief valve 24. The oil outlet of the first relief valve 24 is connected to the oil return line T, and the oil inlet of the first relief valve 24 is connected to the rodless chamber of the hydraulic cylinder. The first relief valve 24 plays a protective role.

[0067] In some embodiments, see Figure 1 The hydraulic control circuit includes a second relief valve 25. The oil outlet of the second relief valve 25 is connected to the oil return line T, and the oil inlet of the second relief valve 25 is connected to the working oil port of the third reversing valve 3. The second relief valve 25 plays a protective role.

[0068] The present application also provides a steelmaking skirt device, including a skirt and the above-mentioned hydraulic control circuit. The skirt is arranged at intervals above the converter. The multiple hydraulic cylinders of the hydraulic control circuit are all connected to the skirt drive, which can realize the smooth operation of the skirt lifting and lowering, and improve the synchronization, stability and reliability of the steelmaking skirt device.

[0069] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0070] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A hydraulic control circuit for driving a skirt spaced above a converter, the hydraulic control circuit comprising: A plurality of hydraulic cylinders are relatively arranged, and each of the plurality of hydraulic cylinders is drivingly connected to the skirt; an oil tank, spaced apart from the hydraulic cylinder, the oil tank being connected to an oil supply line and an oil return line; a first reversing valve, wherein the oil inlet of the first reversing valve is connected to the oil supply circuit, the oil outlet of the first reversing valve is connected to the oil return circuit, and the first working oil port of the first reversing valve is connected to the rodless chambers of the plurality of hydraulic cylinders; A flow distribution cylinder comprises a cylinder body and a piston rod, wherein the cylinder body is provided with a plurality of chambers arranged in sequence along the axial direction of the piston rod, and the volume of each of the chambers is equal. The piston rod comprises a rod portion and a plurality of pistons connected to the rod portion, and the rod portion is movably passed through the cylinder body. The plurality of pistons are arranged in a one-to-one correspondence with the plurality of chambers, and the pistons are arranged in the corresponding chambers and the chambers are divided into a first chamber and a second chamber by the pistons. The volume of the first chamber of each chamber is equal, and the first chambers of the plurality of chambers are connected to the second working oil port of the first reversing valve, and the second chambers of the plurality of chambers are arranged in a one-to-one correspondence with the rod chambers of the plurality of hydraulic cylinders, and the second chambers are connected to the corresponding rod chambers.

2. The hydraulic control circuit according to claim 1, wherein: The hydraulic control circuit includes: a first one-way throttle valve installed in the oil circuit connecting the first chamber to the second working oil port, wherein the oil inlet of the one-way valve of the first one-way throttle valve is connected to the second working oil port, and the oil outlet of the one-way valve of the first one-way throttle valve is connected to the first chamber; A hydraulically controlled one-way valve, the oil inlet of the hydraulically controlled one-way valve is connected to the rodless chambers of multiple hydraulic cylinders, the oil outlet of the hydraulically controlled one-way valve is connected to the oil inlet of the one-way valve of the first one-way throttle valve, and the control oil port of the hydraulically controlled one-way valve is connected to the first working oil port.

3. The hydraulic control circuit according to claim 1, wherein: The hydraulic control circuit includes: a first one-way valve installed in the oil circuit connecting the first chamber to the second working oil port, wherein the oil inlet of the first one-way valve is connected to the second working oil port, and the oil outlet of the first one-way valve is connected to the first chamber; The hydraulic cylinder is arranged vertically, and the rod cavity of the hydraulic cylinder is located below the rodless cavity.

4. The hydraulic control circuit according to any one of claims 1 to 3, characterized in that: The hydraulic control circuit includes: a first position switch, spaced apart from the piston rod of the flow distribution cylinder, for sending a signal when the piston rod of the flow distribution cylinder moves to a point where the first chamber is at a minimum allowable value; The controller is connected to the first position switch signal. The first reversing valve is a solenoid valve. The controller is control-connected to the first reversing valve. The controller is used to control the first reversing valve to change position after receiving the signal from the first position switch.

5. The hydraulic control circuit according to claim 4, characterized in that: The hydraulic control circuit includes: a second reversing valve, wherein the oil inlet of the second reversing valve is connected to the second working oil port, the oil outlet of the second reversing valve is connected to the oil return line, and the working oil port of the second reversing valve is connected to the rod chambers of the plurality of hydraulic cylinders; At least one second one-way valve is installed in the oil circuit connecting the working oil port of the second reversing valve to the rod chamber of the hydraulic cylinder. The oil inlet of the second one-way valve is connected to the working oil port of the second reversing valve, and the oil outlet of the second one-way valve is connected to the rod chamber of the hydraulic cylinder.

6. The hydraulic control circuit according to claim 5, wherein: The hydraulic control circuit includes: a plurality of pressure sensors corresponding one to each of the plurality of hydraulic cylinders, wherein a measuring end of the pressure sensor is disposed in an oil path connected to a rod cavity of the corresponding hydraulic cylinder, and the pressure sensor is used to detect the hydraulic pressure of the rod cavity of the corresponding hydraulic cylinder; a second position switch, spaced apart from the piston rod of the flow distribution cylinder, for sending a signal when the piston rod of the flow distribution cylinder moves to a point where the second chamber is at a minimum allowable value; The controller is signal-connected to the plurality of pressure sensors, the controller is signal-connected to the second position switch, the second reversing valve is a solenoid valve, the controller is control-connected to the second reversing valve, and the controller is used to control the position change of the second reversing valve after receiving the signal from the second position switch.

7. The hydraulic control circuit according to claim 6, wherein: The hydraulic control circuit includes: a third reversing valve, wherein a working oil port of the third reversing valve is communicated with the second chambers of the plurality of chambers, and an oil outlet of the third reversing valve is communicated with the oil return line; at least one third one-way valve installed in the oil circuit connecting the working oil port of the third reversing valve to the second chamber, the oil inlet of the third one-way valve being connected to the second chamber, and the oil outlet of the third one-way valve being connected to the working oil port of the third reversing valve; The controller is control-connected to the third reversing valve, and is configured to control the position change of the third reversing valve after receiving a signal from the second position switch.

8. The hydraulic control circuit according to claim 7, wherein: The hydraulic control circuit includes: a fourth reversing valve, wherein the oil inlet of the fourth reversing valve is connected to the oil supply oil circuit, the oil outlet of the fourth reversing valve is connected to the oil return oil circuit, and one working oil port of the fourth reversing valve is connected to the first chamber of the plurality of chambers. The oil outlet of the second one-way valve is also communicated with the second chamber, and another working oil port of the fourth reversing valve is communicated with the oil inlet of the second one-way valve.

9. The hydraulic control circuit according to any one of claims 1 to 3, characterized in that: The hydraulic control circuit includes: The first flow regulating valve is installed between the oil inlet of the first reversing valve and the oil supply passage.

10. A steelmaking skirt device, characterized in that: include: Skirt, spaced above the converter; The hydraulic control circuit according to any one of claims 1 to 9, wherein the plurality of hydraulic cylinders of the hydraulic control circuit are all drivingly connected to the skirt.

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