CN104745754B - Blast-furnace top distributing device hydraulic control circuit - Google Patents

Abstract

The invention discloses a hydraulic control circuit of a blast furnace roof distributor. The hydraulic control circuit includes at least three tilting hydraulic cylinders, and each of the tilting hydraulic cylinders is provided with a separate closed-loop control circuit. The closed-loop control of the tilting hydraulic cylinders The circuit is used to realize the individual position closed-loop control of each hydraulic cylinder and the dynamic and static compensation control of the hydraulic cylinder position during the movement of the distributor. The hydraulic control circuit also includes a switching circuit, which is used to realize the separate closed-loop control mode and free Automatic switching between synchronous control modes, the present invention has the characteristics of high control precision, less synchronous error, and good reliability and safety, and is suitable for the requirements of high-precision material distribution on the top of the blast furnace, and can also be switched on the basis of canceling the centralized control loop to free sync mode.

Description

Hydraulic Control Circuit of Top Distributor of Blast Furnace

technical field

The invention belongs to the field of metallurgical machinery, and in particular relates to a hydraulic control circuit of a top distributor of a blast furnace.

Background technique

The control of the blast furnace roof distributor is a key link in the blast furnace distribution system, and its control accuracy directly affects the distribution accuracy of the blast furnace distribution system. The existing distributor either adopts a simple centralized hydraulic control method, that is, controls the actions of multiple hydraulic cylinders through a valve, and the hydraulic oil in multiple hydraulic cylinders can move in series with each other, or adopts a composite hydraulic control method, that is, through Three separate closed-loop control loops for controlling the hydraulic cylinders are used to realize the individual position closed-loop control of each hydraulic cylinder and the dynamic compensation control of the three hydraulic cylinder positions during the movement of the cloth distributor. It also includes a centralized hydraulic control loop through a switching loop Realize the automatic switching of two hydraulic control circuits. In the former centralized hydraulic control mode, the control accuracy of the distributor mainly depends on the size of the gap between the guide wheel installed on the support ring and the guide rail installed on the shell, so in order to improve the distribution accuracy of the distributor, the current It is mainly realized by adjusting the gap between the smaller guide rail and the guide wheel. In fact, this method is difficult to ensure the accuracy of the cloth. Since the gap between the guide rail and the guide wheel is reduced, it will increase the difficulty of machining and assembly, and increase the manufacturing cost. At the same time, it is also easy to cause the distributor to be stuck under high temperature conditions. In addition, due to the eccentric load of the lower part of the distributor, the support ring of the distributor driven by the hydraulic cylinder is always in a state of alternating force, which intensifies the impact and wear between the guide wheel and the guide rail. The latter composite hydraulic control system can solve the problems of the centralized hydraulic control system and has been widely used in engineering. But its circuit is too complicated, the cost is high, and the control and maintenance are not easy.

Contents of the invention

In view of this, the object of the present invention is to provide a hydraulic control circuit of a blast furnace roof distributor, which can overcome the above-mentioned defects of the prior art.

The purpose of the present invention is achieved through the following technical solutions:

A hydraulic control circuit for a top distributor of a blast furnace, the hydraulic control circuit includes at least three tilting hydraulic cylinders, each of which is provided with a separate closed-loop control circuit, and the closed-loop control circuit of the tilting hydraulic cylinders is used to realize The individual position closed-loop control of each hydraulic cylinder and the dynamic and static compensation control of the position of the hydraulic cylinder during the movement of the distributor, the hydraulic control circuit also includes a switching circuit, and the switching circuit is used to realize the independent closed-loop control mode and the free synchronous control mode. automatic switching between.

Further, the single closed-loop control circuit includes: a proportional valve, a first hydraulically controlled check valve, a second hydraulically controlled check valve, a third hydraulically controlled check valve and a reversing valve; wherein, the P port of the proportional valve passes through the first A hydraulic control check valve is connected to the external oil inlet pipeline, and the T port of the proportional valve is connected to the external oil return pipeline; the A port of the proportional valve is connected to the rodless chamber of the hydraulic cylinder after passing through the second hydraulic control check valve; the proportional valve The B port of the hydraulic cylinder is connected to the rod cavity of the hydraulic cylinder after passing through the third hydraulic control check valve; the pressure oil at the P port of the proportional valve is connected to the A or B port of the proportional valve after being switched by the proportional valve, and the reversing valve The P port and T port of the port are respectively connected to the external oil inlet pipe and the external oil return pipe, the B port is connected to the control port of the first to the third hydraulic control check valve, all the first to the third hydraulic control check valve The drain port is connected to an external drain line L.

Further, the switching circuit includes: an electromagnetic cartridge valve for switching; a cover plate cartridge valve, and the switching circuit controls the on-off of the inlet and outlet oil circuits of each hydraulic cylinder through the switching of the top-mounted directional valve of the electromagnetic cartridge valve.

Further, the single closed-loop control loop includes: a proportional valve and an electromagnetic cut-off valve; wherein, the P port of the proportional valve is connected to an external oil inlet pipeline through an electromagnetic poppet valve, and the T port of the proportional valve is connected to an external oil return pipeline; Port A and port B are connected to the rodless chamber and the rod chamber of the hydraulic cylinder through an electromagnetic cut-off valve.

Further, the switching circuits are respectively arranged on independent oil circuit blocks, including: electromagnetic cartridge valves for switching and cover plate cartridge valves, which can simultaneously control the oil in and out of the hydraulic cylinder through the top-mounted directional valve of the electromagnetic cartridge valves. The break of the road.

Further, the tilting hydraulic cylinder is also provided with a pressure sensor and a displacement sensor.

Further, each of the closed-loop control circuits includes at least one safety protection module: the safety protection module is used to perform oil draining and oil replenishment when the hydraulic circuit fails.

The beneficial effects of the present invention are: the present invention provides a simple and reliable hydraulic control circuit for the blast furnace top distributor, the system can be controlled independently by three (or more) hydraulic cylinders, and has the advantages of high control precision, less synchronization error, reliable It has the characteristics of good safety and safety, and is suitable for the requirements of high-precision material distribution on the top of the blast furnace. At the same time, it can also switch to the free synchronization mode on the basis of canceling the centralized control loop.

The present invention retains all the advantages of the composite hydraulic control system of the distributor:

(1) After using this system, the material distribution accuracy of the material distributor mainly depends on the control accuracy of the hydraulic system. The position accuracy of the oil cylinders is guaranteed through the independent position closed-loop control of the three cylinders. It also maintains synchronization during the adjustment process, which greatly improves the cloth accuracy of the cloth distributor, and avoids the problem that the mechanical guidance error affects the cloth accuracy.

(2) The positions of the three oil cylinders can be adjusted timely through separate closed-loop control, and the supporting ring is basically kept in a horizontal state during the working process, which reduces the impact and wear between the guide wheel and the guide rail.

(3) The present invention has designed switching circuit in this hydraulic control circuit, and this circuit can also automatically switch under two kinds of control modes of separate closed-loop synchronous control and free synchronous control by the detected signal, thereby improves the efficiency of the whole control system reliability and safety.

In addition, the present invention is a different scheme from the prior art "a composite hydraulic control system for a blast furnace roof distributor", which has only one switching circuit and no centralized control circuit, and can realize a separate closed-loop control circuit and a free synchronous control circuit. automatic switching between. The present invention cancels the centralized control loop in the composite hydraulic control system of the distributor, and adopts a newly designed switching control loop, which not only can realize the same function, but also realizes switching with fewer components and loops, and has better reliability and safety , more economical and practical.

Other advantages, objects and features of the present invention will be set forth in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the investigation and research below, or can be obtained from It is taught in the practice of the present invention. The objects and other advantages of the invention may be realized and attained by the following specification.

Description of drawings

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is a schematic diagram of the present invention;

Fig. 2 is the structural representation of embodiment 1 of the present invention;

Fig. 3 is a schematic structural diagram of Embodiment 2 of the present invention.

detailed description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, but not for limiting the protection scope of the present invention.

Embodiment 1, as shown in Figure 2:

The separate closed-loop control loops are divided into three groups: the first set of separate closed-loop control loops includes: the P port of the proportional valve 3.1 is connected to the external oil inlet pipeline through the first hydraulic control check valve 5.1, and the T port of the proportional valve 3.1 is connected to the external oil return Pipeline; the A port of the proportional valve is connected to the rodless chamber of the hydraulic cylinder 1.1 after passing through the second hydraulic control check valve 5.2; the B port of the proportional valve 3.1 is connected to the hydraulic cylinder 1.1 through the third hydraulic control check valve 5.3. Rod chamber; the pressure oil at the P port of the proportional valve 3.1 is connected to the proportional valve A port or B port after the proportional valve is reversed; after the controller receives the target command signal, it calculates and sends the proportional valve control signal through the closed-loop control software, so as to realize the proportional valve. Valve reversing and valve opening control; through the control of the proportional valve, the dynamic supply and discharge of oil to the rodless chamber and the rod chamber of the hydraulic cylinder 1.1 is realized, so that the hydraulic cylinder 1.1 reaches and maintains the target position.

The second group of independent closed-loop control loops includes: the P port of the proportional valve 3.2 is connected to the external oil inlet pipeline through the hydraulic control first check valve 5.4, the T port of the proportional valve 3.2 is connected to the external oil return pipeline; the A port of the proportional valve 3.2 After passing through the second hydraulic control check valve 5.5, it is connected to the rodless chamber of the hydraulic cylinder 1.2; after the B port of the proportional valve 3.2 passes through the third hydraulic control check valve 5.6, it is connected to the rod chamber of the hydraulic cylinder 1.2;

The third group of independent closed-loop control circuits includes: the P port of the proportional valve 3.3 is connected to the external oil inlet pipeline through the first hydraulic control check valve 3.7, the T port of the proportional valve 3.3 is connected to the external oil return pipeline; the A port of the proportional valve 3.3 After passing through the second hydraulic control check valve 5.8, it is connected to the rodless cavity of the hydraulic cylinder 1.3; after the B port of the proportional valve 3.3 passes through the third hydraulic control check valve 5.9, it is connected to the rod cavity of the hydraulic cylinder 1.3;

The control principle of the second independent closed-loop control loop is the same as that of the third independent closed-loop control loop, and will not be repeated here.

The P port and T port of the reversing valve 4.1; 4.2; 4.3 are respectively connected to the external oil inlet pipe and the external oil return pipe, and the B port is respectively connected to the control of the hydraulic control check valve 5.1-5.3; 5.4-5.6; 5.7-5.9 Oil ports; the oil drain ports of all hydraulic control check valves 5.1-5.9 are connected to the external oil drain pipe L; when separate closed-loop control is required, the reversing valves 4.1-4.3 work, and the oil ports of the reversing valves 4.1; 4.2; 4.3 B has control pressure to open 5.1-5.3; 5.4-5.6; 5.7-5.9 hydraulic control check valves respectively. Since each set of individual control loops is controlled by a reversing valve to turn on and off the hydraulic control check valve, each set of individual control loops can be individually cut off the oil circuit and repaired online.

The switching circuit includes: switching electromagnetic cartridge valve 11.1; cover plate cartridge valve 12.1-12.3, which can be switched through 11.1 top-mounted directional valve to control the on-off of A1, A2, A3 and B1, B2, B3 oil circuits, In this way, the switching between a free synchronous control loop and a separate closed-loop control loop is realized.

When the top-mounted directional valve of the electromagnetic cartridge valve 11.1 is energized, the cartridge valves 11.1, 12.1-12.3 are opened, the oil circuits of A1, A2, A3 and B1, B2, B3 are respectively conducted, and any two of the proportional valves 3.1-3.3 A circuit works, and the driving cylinder 1.1-1.3 moves, and the free synchronous control is realized.

The safety protection modules include three groups: the first group of safety protection modules includes: the inlet of the safety relief valve 10.1 is connected to the oil port A1, and the outlet is connected to the external oil return pipeline; the inlet of the safety relief valve 10.2 is connected to the oil port B1, and the outlet is connected to External oil return line. When the hydraulic cylinder 1.1 is subject to external impact or other failure reasons, which tends to extend or retract and the pressure is greater than the safety pressure, the cylinder cavity can be overflowed and released through the safety valve of this module.

The principles and functions of the second group and the third group of safety protection modules are exactly the same as those of the first group, and will not be repeated here.

When working normally, the switching circuit completely cuts off the oil circuits of A1, A2, A3 and B1, B2, B3 without leakage. In this way, the three hydraulic cylinders are controlled individually by three separate closed-loop control circuits. At the same time, the synchronization of the oil cylinders during the movement is ensured through the closed-loop synchronous control method of the three cylinders, so as to ensure the tilting of the material distributor during the material distribution process. Position control accuracy.

During the material distribution process, if any of the pressure sensors 6.1-6.6 and displacement sensors 7.1-7.3 on the three oil cylinders is abnormal, that is, a certain error is exceeded, a synchronization error fault or other fault signals in the oil circuit will be generated; when When the control system detects this signal, the system automatically energizes the top-mounted directional valve of the electromagnetic cartridge valve 11.1, the oil circuits of A1, A2, A3 and B1, B2, and B3 are respectively conducted, and at the same time, any group of individual closed-loop control circuits is closed , any two circuits of the proportional valve 3.1-3.3 work, and drive the oil cylinder 1.1-1.3 to act. At this time, only one oil cylinder participates in the position closed-loop control, and the synchronization of the three oil cylinders is realized by mechanical guidance. In this way, if any oil cylinder in the entire material distribution system has an abnormal position and pressure, the hydraulic system will automatically switch to free for safety reasons. The synchronous control circuit enables the oil circuits of the three oil cylinders to communicate with each other, so that the oil pressure can be self-adaptively balanced, thereby avoiding damage to weak links in the system due to mutual interference of oil cylinders or mechanical mechanisms. It ensures the reliability and safety of the entire system, and provides a guarantee for the safe production and maintenance of the cloth control system.

In addition, in any process of fabric distribution, if the oil pressure in the oil cylinder is over-pressurized or sucked out due to various reasons, the safety protection module can drain and replenish oil to the oil cylinder to play a role of safety protection, so that The whole system is more reliable and safe.

The proportional valve used in the present invention can also be replaced by a servo valve, and the cut-off valve can adopt a cartridge valve, a hydraulic control check valve or an electromagnetic seat valve, etc., and similar transformations all fall within the protection scope of the present invention.

Embodiment 2, as shown in Figure 3:

There are three groups of separate closed-loop control circuits: the first group of separate closed-loop control circuits includes: the P port of the proportional valve I 2.1 is connected to the external oil inlet pipeline through the electromagnetic poppet valve 9.1, and the T port of the proportional valve I 2.1 is connected to the external oil return pipeline; Port A and port B of the proportional valve are connected to the rodless chamber and the rod chamber of the hydraulic cylinder 1.1 through the electromagnetic cut-off valve 13.1; the controller calculates the proportional valve control signal through the closed-loop control software after receiving the target command signal, so as to realize the control of the proportional valve. Reversing and valve opening control; through the control of the proportional valve, the dynamic supply and discharge of oil to the rodless chamber and the rod chamber of the hydraulic cylinder 1.1 is realized, so that the hydraulic cylinder 1.1 reaches and maintains the target position.

The second group of independent closed-loop control circuits include: the P port of the proportional valve I 2.2 is connected to the external oil inlet pipeline through the electromagnetic poppet valve 9.2, the T port of the proportional valve I 2.2 is connected to the external oil return pipeline; the A port and the B port of the proportional valve Connected to the rodless chamber and the rod chamber of the hydraulic cylinder 1.2 through the electromagnetic shut-off valve 13.2;

The third group of independent closed-loop control circuits includes: the P port of the proportional valve I 2.3 is connected to the external oil inlet pipeline through the electromagnetic poppet valve 9.3, the T port of the proportional valve I 2.3 is connected to the external oil return pipeline; the A port and the B port of the proportional valve Connected to the rodless chamber and the rod chamber of the hydraulic cylinder 1.3 through the electromagnetic shut-off valve 13.3;

The control principle of the second independent closed-loop control loop is the same as that of the third independent closed-loop control loop, and will not be repeated here.

When the electromagnetic poppet valves 9.1, 9.2, 9.3 and the electromagnetic cut-off valves 13.1, 13.2, 13.3 are energized, the three proportional valves I 2.1, 2.2, 2.3 are respectively connected to the oil circuit of each chamber: the oil inlet of the proportional valve and the main pressure oil circuit guide The oil return of the proportional valve is connected with the oil return of the main system, and the A and B oil ports of the three proportional valves are respectively connected with the rodless chambers A1, A2, A3 and the rod chambers B1, B2, B3 of the corresponding cylinders.

The switching circuits are respectively set on three independent oil circuit blocks, including: electromagnetic cartridge valves I 17.1, 17.2, 17.3 for switching; The top-mounted directional valves of 17.1-17.3 change direction at the same time to control the on-off of A1, A2, A3 and B1, B2, B3 oil circuits, so as to realize the switching between free synchronous control loop and independent closed-loop control loop.

When the top-mounted directional valve of the electromagnetic cartridge valve I 17.1-17.3 is energized, the cartridge valves 17.1-17.3, 15.1-15.3 are opened, and the oil circuits of A1, A2, A3 and B1, B2, B3 are respectively conducted, and the proportional valve I Any two loops of 2.1-2.3 work, and drive the oil cylinder 1.1-1.3 to move, thus realizing free synchronous control.

The safety protection module includes three groups: the first group safety protection module includes: the inlet of the overflow valve on the left and right sides of the superimposed layout function block 10.1 is connected with the oil ports A1 and B1, and the outlet is connected to the external oil return pipeline through the oil return port on the superimposed valve , when the hydraulic cylinder 1.1 is subject to external shocks or other failures, which tends to extend or retract and the pressure is greater than the safety pressure, the cylinder cavity can be overflowed and released through the safety valve of this module.

The principles and functions of the second group and the third group of safety protection modules are exactly the same as those of the first group, and will not be repeated here.

When working normally, the switching circuit completely cuts off the oil circuits of A1, A2, A3 and B1, B2, B3 without leakage. In this way, the three hydraulic cylinders are controlled individually by three separate closed-loop control circuits. At the same time, the synchronization of the oil cylinders during the movement is ensured through the closed-loop synchronous control method of the three cylinders, so as to ensure the tilting of the material distributor during the material distribution process. positional accuracy.

During the material distribution process, if any of the pressure sensors 6.1-6.6 and displacement sensors 8.1, 8.2 or 8.3 on the three oil cylinders is abnormal, that is, a certain error is exceeded, a synchronization error fault or other fault signals in the oil circuit will be generated ; When the control system detects this signal, the system automatically makes the top-mounted directional valve of the electromagnetic cartridge valve I 17.1-7.3 energized, and the A1, A2, A3 and B1, B2, B3 oil circuits are respectively conducted, and any one of them is closed at the same time. A separate closed-loop control loop is set, and any two loops of the proportional valve I 2.1-2.3 work to drive the oil cylinder 1.1-1.3 to act. At this time, only one oil cylinder participates in the position closed-loop control, and the synchronization of the three oil cylinders is realized by mechanical guidance. In this way, if any oil cylinder in the entire material distribution system has an abnormal position and pressure, the hydraulic system will automatically switch to free for safety reasons. The synchronous control circuit enables the oil circuits of the three oil cylinders to communicate with each other, so that the oil pressure can be self-adaptively balanced, thereby avoiding damage to weak links in the system due to mutual interference of oil cylinders or mechanical mechanisms. It ensures the reliability and safety of the entire system, and provides a guarantee for the safe production and maintenance of the cloth control system.

In addition, in any process of fabric distribution, if the oil pressure in the oil cylinder is over-pressurized or sucked out due to various reasons, the safety protection module can drain and replenish oil to the oil cylinder to play a role of safety protection, so that The whole system is more reliable and safe.

In addition, this embodiment adopts a large number of superimposed valves and a special design of three sets of independent cartridge valves so that the three oil circuit blocks are independent from each other, and the volume of the three oil circuit blocks is small. The three oil circuit blocks can be installed next to the three oil cylinders of the distributor, and only connected by pipelines, which reduces the length of pipelines between the valve table and the oil cylinders, and is conducive to improving the accuracy of synchronous control.

The proportional valve used in the present invention can also be replaced by a servo valve, and the cut-off valve can adopt a cartridge valve, a hydraulic control check valve or an electromagnetic seat valve, etc., and similar transformations all fall within the protection scope of the present invention.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements, without departing from the spirit and scope of the technical solution, should be included in the scope of the claims of the present invention.

Claims (4)

1. a kind of blast-furnace top distributing device hydraulic control circuit, it is characterised in that：The hydraulic control circuit includes at least three Fascinate hydraulic cylinder, and the hydraulic cylinder that fascinates is provided with single close loop control circuit, the closed loop control of the hydraulic cylinder that fascinates Loop is used to realize that the sound state of Position of Hydraulic Cylinder in the independent position-force control of each hydraulic cylinder and distributing device motor process to be mended Control is repaid, the hydraulic control circuit also includes a switching circuit, and the switching circuit is used to realize independent closed loop control side Automatic switchover between formula and free synchronization control mode, the single close loop control circuit include：Proportioning valve（3.1）, first Hydraulic control one-way valve（5.1）, the second hydraulic control one-way valve（5.2）, the 3rd hydraulic control one-way valve（5.3）And reversal valve（4.1）；Wherein, than Example valve（3.1）P mouths pass through the first hydraulic control one-way valve（5.1）Externally connected inflow pipeline, proportioning valve（3.1）T mouths connection To outside oil returning tube；Proportioning valve（3.1）A mouths pass through the second hydraulic control one-way valve（5.2）After be connected to hydraulic cylinder（1.1）Nothing Rod cavity；Proportioning valve（3.1）B mouths pass through the 3rd hydraulic control one-way valve（5.3）After be connected to hydraulic cylinder（1.1）Rod chamber；Ratio Valve（3.1）P mouths pressure oil passing ratio valve commutation after be communicated to proportioning valve A mouths or B mouths, the reversal valve（4.1）P Mouth, T mouths are respectively connecting to outside inflow pipeline and outside oil returning tube, and B mouths are connected to the first to the 3rd hydraulic control one-way valve（5.1- 5.3）Control port, all first to the 3rd hydraulic control one-way valves（5.1-5.3）The externally connected draining pipeline L of drain tap, The switching circuit includes：Switching electromagnetic cartridge valve（11.1）；Cover plate inserted valve（12.1-12.3）, the switching circuit lead to Cross electromagnetic cartridge valve（11.1）The break-make of each hydraulic cylinder inlet and outlet of fuel channel of top dress direction valve commutation control, each described closed loop control are returned Road includes at least one security protection module：The security protection module, for when hydraulic circuit breaks down, carrying out phase The draining answered and the work of repairing.

2. blast-furnace top distributing device hydraulic control circuit according to claim 1, it is characterised in that：The single closed loop control Loop processed includes：Proportioning valve I（2.1）And electromagnetic shut-off valve（13.1）；Wherein, proportioning valve I（2.1）P mouths by electromagnetism lifted Valve（9.1）Externally connected inflow pipeline, proportioning valve I（2.1）The externally connected oil returning tube of T mouths；Proportioning valve I（2.1）A Mouth, B mouths pass through electromagnetic shut-off valve（13.1）It is connected to hydraulic cylinder（1.1）Rodless cavity and rod chamber.

3. blast-furnace top distributing device hydraulic control circuit according to claim 1, it is characterised in that：The switching circuit point It is not arranged on independent oil path block, including：Electromagnetic cartridge valve I is used in switching（17.1~17.3）, cover plate inserted valve（15.1~ 15.3）, switching electromagnetic cartridge valve I can be passed through（17.1~7.3）Top dress direction valve simultaneously commutation control hydraulic cylinder enters fuel-displaced The break-make on road.

4. blast-furnace top distributing device hydraulic control circuit according to claim 1, it is characterised in that：The hydraulic cylinder that fascinates It is additionally provided with pressure transducer（6.1~6.6）And displacement transducer（7.1-7.3 and 8.1 ~ 8.3）.