CN111790900A - Automatic unloading device for oil cylinder of steel ladle sliding plate mechanism of continuous casting machine and working method - Google Patents
Automatic unloading device for oil cylinder of steel ladle sliding plate mechanism of continuous casting machine and working method Download PDFInfo
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- CN111790900A CN111790900A CN202010456516.2A CN202010456516A CN111790900A CN 111790900 A CN111790900 A CN 111790900A CN 202010456516 A CN202010456516 A CN 202010456516A CN 111790900 A CN111790900 A CN 111790900A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
- B22D41/38—Means for operating the sliding gate
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Abstract
The invention relates to a continuous casting machine steel ladle slide plate mechanism oil cylinder automatic unloading device and a working method, the device comprises an oil inlet hydraulic main pipe, an oil cylinder and an oil return hydraulic main pipe which are sequentially communicated, a quick action system is connected between the oil cylinder and the oil inlet hydraulic main pipe as well as between the oil cylinder and the oil return hydraulic main pipe, an oil inlet hydraulic branch pipe and an oil return hydraulic branch pipe are respectively led out between the oil cylinder and the quick action system, the oil inlet hydraulic branch pipe and the oil return hydraulic branch pipe are respectively communicated with the oil return hydraulic main pipe through the unloading oil return branch pipe, two unloading oil return branch pipes are provided with two-position four-way valves, the two-position four-way valves correspond to the upper and; the quick action system and the two-position four-way valve are in signal connection with the control system. The invention can realize active unloading of the oil cylinder, has the emergency function of avoiding the casting of the continuous casting machine, effectively reduces the labor intensity of workers by combining the use method of the device and prolongs the service life of robot equipment.
Description
Technical Field
The invention relates to the technical field of automatic unloading of oil cylinders, in particular to an automatic unloading device of an oil cylinder of a steel ladle sliding plate mechanism of a continuous casting machine and a working method.
Background
In the continuous casting process of the continuous casting machine, after molten steel is poured into one ladle, an empty ladle needs to be transferred into a hanging-off area by using a ladle turret to be hung away by a traveling crane, at the moment, a hydraulic oil cylinder installed on a sliding plate mechanism of the ladle needs to be disassembled, a new ladle filled with the molten steel is left to be hung on the ladle turret, and then the hydraulic oil cylinder is installed on the sliding plate mechanism to be recycled. The ladle slide plate mechanism is fixedly arranged on the side surface of a ladle nozzle, an oil cylinder mounting base is arranged in the ladle slide plate mechanism and used for mounting a hydraulic oil cylinder, and the hydraulic oil cylinder of the ladle slide plate mechanism can be mounted in the oil cylinder mounting base of the slide plate mechanism and can be detached. The steel ladle slide plate mechanism controls the opening and closing of the slide plate mechanism through the extension and contraction of a piston rod of a hydraulic oil cylinder, and is used for controlling the flow of the steel ladle molten steel. The traditional hydraulic cylinder mounting mode is that a hydraulic cylinder is accurately sleeved with a cylinder mounting base, a cylinder piston rod and a sliding plate T-shaped connecting rod together manually, and then a manual bolt is used for fixing the cylinder. The temperature of molten steel in a ladle is about 1500 ℃ usually, and the surface temperature of a sliding plate mechanism is more than 100 ℃. In the manual installation and disassembly process, a worker needs to endure high-temperature baking for a long time and has potential safety hazards of scalding, so that the robot is adopted to replace manual operation. When the sliding plate mechanism oil cylinder is automatically installed and removed by using a robot, the pressure unloading of the oil cylinder needs to be manually and automatically controlled, so that the friction force between the claw of the oil cylinder and the mechanism is reduced to be extremely low, and the friction force of the original system is extremely high under the condition of 18MPa and exceeds the stress of the robot, so that the oil cylinder cannot be automatically removed by the robot.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an automatic unloading device for an oil cylinder of a steel ladle slide plate mechanism of a continuous casting machine and a working method. The method of the invention effectively reduces the labor intensity of workers and prolongs the service life of the robot equipment.
The technical purpose of the invention is realized by the following technical scheme: an automatic unloading device for an oil cylinder of a steel ladle sliding plate mechanism of a continuous casting machine comprises an oil inlet hydraulic main pipe, an oil cylinder and an oil return hydraulic main pipe which are sequentially communicated, wherein a quick action system is connected between the oil cylinder and the oil inlet hydraulic main pipe as well as between the oil cylinder and the quick action system, an oil inlet hydraulic branch pipe and an oil return hydraulic branch pipe are respectively led out between the oil cylinder and the quick action system, the oil inlet hydraulic branch pipe and the oil return hydraulic branch pipe are respectively communicated with the oil return hydraulic main pipe through an unloading oil return branch pipe, two unloading oil return branch pipes are provided with two-position four-way valves, the two-position four-way valves correspond to the upper and lower ends of the two unloading; and the quick action system and the two-position four-way valve are in signal connection with a control system.
Furthermore, the oil inlet hydraulic branch pipe and the oil return hydraulic branch pipe and the oil inlet hydraulic main pipe and the oil return hydraulic main pipe are also provided with a manual control action system connected with the quick action system in parallel, and the quantity of the quick action systems is two and the quick action systems are connected in parallel.
Furthermore, the quick action system and the manual control action system respectively comprise a three-position four-way valve, a hydraulic one-way valve and a speed regulating valve which are sequentially communicated.
Furthermore, the two-position four-way valve and the three-position four-way valve in the quick action system are all electromagnetic directional valves.
The invention also comprises a working method of the automatic unloading device of the oil cylinder of the steel ladle slide plate mechanism of the continuous casting machine, which comprises the following steps:
s1, after the molten steel is poured into the ladle, the empty ladle is transferred into a hanging-off area through a ladle turret to be hoisted away by a crane, and at the moment, an operator sends a disassembling instruction through a control system;
s2, the control system sends out an electric signal to electrify the two-position four-way valve, so that the oil pressure of the rod cavity and the rodless cavity of the oil cylinder is unloaded into an oil return hydraulic main pipe, and then the oil pressure is lost;
s3, the control system transmits a detaching signal to the robot system, detaches the oil cylinder and grabs the oil cylinder to return to a standby position to wait for the installation of the next steel ladle;
s4, hoisting the ladle filled with molten steel to a ladle turret of a continuous casting machine, and sending an installation instruction by an operator through a control system;
s5, the control system transmits an installation signal to the robot system, and the robot grabbing oil cylinder is installed on the steel ladle base;
s6, an operator sends a work instruction through the control system, and the quick action system controls the molten steel to flow out of the tundish for casting;
and S7, repeating the step S1 after the casting is finished.
Further, the method also comprises the following step of accident emergency: after finding the fault of the two-position four-way valve, an operator opens the manual stop valve to carry out manual unloading work, closes the manual stop valve after the manual unloading work is finished, searches for the fault and restores to normal work.
Further, in the step S4, after the control system issues the installation command, the control system first issues an electrical signal to power on the two-position four-way valve, and then loses power, and then the process proceeds to the step S5.
Furthermore, the power-on time of the two-position four-way valve is 8-12 seconds, and the control system is controlled by an operator through a remote control console and a button thereof.
Further, in step S6, the fast acting system is controlled by controlling a three-position four-way valve, a hydraulic one-way valve and a speed regulating valve in the fast acting system, so that the hydraulic pressure of the oil inlet hydraulic main pipe is communicated with each other through the oil inlet hydraulic branch pipe and the oil return hydraulic branch pipe, and a piston rod of the oil cylinder drives a connecting ball head to push the sliding plate mechanism to reciprocate; and when the casting reaches the set flow, the three-position four-way valve is powered off and is kept until the casting is finished.
Further, when the quick action system fails, the manual control action system connected with the quick action system in parallel is manually controlled to complete the step, and a fault is searched for to recover normal work.
In conclusion, the invention has the following beneficial effects:
1. the invention can realize the active unloading of the oil cylinder, is convenient for a robot to automatically disassemble the oil cylinder, has the emergency function of avoiding the casting of a continuous casting machine, is suitable for the working occasions of a metallurgical continuous casting machine, effectively reduces the labor intensity of workers by combining the use method of the device, and prolongs the service life of robot equipment.
2. The device has simple structure operation, stable operation and convenient installation, a group of two-position four-way valves for automatic unloading are additionally arranged in the hydraulic control system of the oil cylinder, and the action of the two-position four-way valves is remotely controlled to ensure that the rod cavity and the rodless cavity of the oil cylinder of the sliding plate are communicated with the oil return port, so that the pressure of the two cavities of the oil cylinder is changed to 0, namely the automatic unloading of the oil cylinder is realized, the operation difficulty is reduced, the safety of the operation process is improved, the manual control is compatible, and the pressure unloading of the two cavities of the oil cylinder can be manually carried out under the abnormal condition of the.
3. The method ensures that the pressure of the rod cavity and the rodless cavity of the oil cylinder is zero before and after the robot loads and unloads the oil cylinder, and the friction force between the piston rod and the connecting ball head is weakened to zero at the moment, so that the robot can conveniently and automatically unload the oil cylinder of the sliding plate mechanism. The method has the advantages that the robot replaces manual operation, personnel safety accidents are completely eliminated, the structure is simple and reliable, and the maintenance is convenient.
4. The two-position four-way valve is powered on and then powered off around the loading and unloading oil cylinder of the robot, so that the robot can complete the operation, the failure rate of equipment can be effectively reduced, and meanwhile, corresponding emergency measures are preset in each main working step to prevent the continuous use of the continuous casting machine from being influenced by the faults of circuits or remote control signals and the like, and the possibility of casting off of the continuous casting machine is avoided.
Drawings
FIG. 1 is a schematic structural diagram of an automatic unloading device of an oil cylinder of a ladle slide plate mechanism of a continuous casting machine according to the invention;
FIG. 2 is a schematic structural diagram of the connection of the oil cylinder and the ladle of the present invention.
In the figure: 1. a fast acting system; 2. a three-position four-way valve; 3. a hydraulic check valve; 4. a speed regulating valve; 5. an oil cylinder; 6. an oil inlet hydraulic branch pipe; 7. an oil return hydraulic branch pipe; 11. a manual operating system; 12. unloading an oil return branch pipe; 13. a two-position four-way valve; 14. a manual stop valve; 15. an oil return hydraulic main pipe; 16. an oil inlet hydraulic main pipe; 17. a base; 18. a piston rod; 19. connecting a ball head; 20. a slide mechanism; 21. and (5) steel ladles.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
It should be noted that all the directional terms such as "upper" and "lower" referred to herein are used with respect to the view of the drawings, and are only for convenience of description, and should not be construed as limiting the technical solution.
As shown in fig. 1, an automatic unloading device for an oil cylinder of a steel ladle slide plate mechanism of a continuous casting machine comprises an oil inlet hydraulic main pipe 16, an oil cylinder 5 and an oil return hydraulic main pipe 15 which are sequentially communicated, wherein a quick action system 1 is connected between the oil cylinder 5 and the oil inlet hydraulic main pipe 16 as well as between the oil cylinder 5 and the quick action system 1, an oil inlet hydraulic branch pipe 6 and an oil return hydraulic branch pipe 7 are respectively led out between the oil cylinder 5 and the quick action system 1, the oil inlet hydraulic branch pipe 6 and the oil return hydraulic branch pipe 7 are respectively communicated with the oil return hydraulic main pipe 15 through an unloading oil return branch pipe 12, two unloading oil return branch pipes 12 are provided with two-position four-way valves 13, the two-position four-way valves 13 respectively cut a; the quick action system 1 and the two-position four-way valve 13 are connected with a control system through signals. The invention can realize the active unloading of the oil cylinder, is convenient for a robot to automatically disassemble the oil cylinder 5, has the emergency function of avoiding the casting of a continuous casting machine, is suitable for the working occasions of a metallurgical continuous casting machine, effectively reduces the labor intensity of workers and prolongs the service life of robot equipment.
The device has simple structure operation, stable operation and convenient installation, a group of two-position four-way valves 13 for automatic unloading are additionally arranged in a hydraulic control system of the oil cylinder 5, and the action of power on and power off of the two-position four-way valves 13 is remotely controlled to communicate the rod cavity and the rodless cavity of the oil cylinder 5 on the sliding plate mechanism 20 with the oil return hydraulic main pipe 15, so that the pressure of the two cavities of the oil cylinder 5 is changed to 0, namely the automatic unloading of the oil cylinder 5 is realized, the operation difficulty of loading and unloading the oil cylinder 5 is reduced, the safety of the operation process is improved, manual control and emergency protection measures are compatible, the pressure unloading of the two cavities of the oil cylinder can be manually carried out by controlling the manual stop valve 14 under the abnormal condition of a clamp, and the possibility of casting of a continuous casting machine under the.
In this embodiment, manual actuation systems 11 connected in parallel with the quick actuation systems 1 are further provided between the oil inlet hydraulic branch pipe 6 and the oil return hydraulic branch pipe 7 and the oil inlet hydraulic header pipe 16 and the oil return hydraulic header pipe 15, and the number of the quick actuation systems 1 is two and the two are connected in parallel. The quick action system 1 and the manual control action system 11 respectively comprise a three-position four-way valve 2, a hydraulic one-way valve 3 and a speed regulating valve 4 which are sequentially communicated. And the two-position four-way valve and the three-position four-way valve in the quick action system are all electromagnetic directional valves.
The operating system controls the three-position four-way valve 2, the hydraulic one-way valve 3 and the speed regulating valve 4 of the quick action system 1 to perform combined action through signals, as shown in figure 2, a piston rod 18 of the oil cylinder 5 drives a connecting ball head 19 to push a sliding plate mechanism 20 to reciprocate back and forth, so that the control of the molten steel outflow in a steel ladle 21 is realized. Compared with the use of only one fast acting system 1, the two fast acting systems are arranged in the embodiment to provide guarantee for the fast acting system 1 mainly used in the system, and especially when sudden faults and the like need to be overhauled and maintained, in order to avoid the continuous casting machine from being cast off and continuous work thereof, the standby fast acting system 1 can be used to avoid influencing the quality and efficiency of the casting work. In addition, in order to prevent the occurrence of a fault such as signal reception of the operating system, the operator can also use the manual operating system 11 to complete the operation, and the manual operating system 11 has the same principle as the quick operating system 1, except that the manual operating system 11 requires the operator to perform field control and can also be used as a manual unloading device for the oil cylinder 5. When a fault is found and the manual control action system 11 is used for operation, the oil circuit of the system needs to be unloaded through the stop valves which are in short circuit at the upper end and the lower end of the manual control action system 11, so that the quick action system 1 can be reused without being influenced.
The invention also provides a working method of the automatic unloading device of the oil cylinder of the continuous casting machine ladle sliding plate mechanism, which comprises the following steps:
s1, after the molten steel is poured into the ladle 21, the empty ladle 21 is transferred into a hanging-off area through a ladle turret to be hoisted away by a crane, and at the moment, an operator sends a disassembling instruction through a control system;
s2, the control system sends out an electric signal to electrify the two-position four-way valve 13, so that the oil pressure of the rod cavity and the rodless cavity of the oil cylinder 5 is unloaded into the oil return hydraulic main pipe 15, and then the electricity is lost;
s3, the control system transmits a detaching signal to the robot system, detaches the oil cylinder 5 and grabs the oil cylinder 5 to return to a standby position to wait for the installation of the next steel ladle 21;
s4, hoisting the ladle 21 filled with molten steel to a ladle turret of a continuous casting machine, and sending an installation instruction by an operator through a control system;
s5, the control system transmits an installation signal to the robot system, and the robot grabbing oil cylinder 5 is installed on the ladle base 17;
s6, an operator sends a work instruction through the control system, and the quick action system 1 controls the molten steel to flow out of the tundish for casting;
and S7, repeating the step S1 after the casting is finished.
The method uses the remote operation table and the buttons thereof to realize remote control, and the control system adopts a PLC system to realize the automatic continuous work of the continuous casting machine, thereby being applicable to the working occasions of metallurgical continuous casting machines. The method ensures that the pressure of the rod cavity and the rodless cavity of the oil cylinder 5 is zero before and after the robot loads and unloads the oil cylinder 5, and the friction force between the piston rod and the connecting ball head is weakened to zero at the moment, so that the robot can conveniently and automatically unload and load the oil cylinder 5 of the slide plate mechanism 20. The method has the advantages that the robot replaces manual operation, personnel safety accidents are completely eliminated, the structure is simple and reliable, and the maintenance is convenient.
The working method of the invention also comprises the following steps of accident emergency: after finding the fault of the two-position four-way valve 13, an operator opens the manual stop valve 14 to carry out manual unloading work, closes the manual stop valve 14 after the manual unloading work is finished, searches for the fault and restores to normal work. In the use and working process, a valve core of the two-position four-way valve 13 can be blocked by sundries, so that a hydraulic oil path is blocked, and the normal unloading of the oil cylinder 5 of the sliding plate mechanism 20 cannot be finished; or the two-position four-way valve 13 can not be electrified to work normally due to the fact that an electric circuit is broken. After an operator finds a fault, the operator manually pulls the valve stand to open the two manual stop valves 14, so that the unloading oil way is communicated through the short-circuit branch to carry out manual unloading work.
In step S4, after the control system issues the installation command, it first sends an electrical signal to power on the two-position four-way valve 13, and then loses power, and then the process goes to step S5. The power-on time of the two-position four-way valve 13 is 10 seconds to ensure that the oil way unloading is finished. The purpose of opening the unloading loop again is to ensure that the pressure of the rod cavity and the rodless cavity of the oil cylinder 5 of the slide plate mechanism 20 is zero at the moment, so that the oil cylinder 5 can be conveniently reinstalled by the robot.
In step S6, the fast acting system 1 is controlled by controlling the three-position four-way valve 2, the hydraulic check valve 3 and the speed regulating valve 4 in the fast acting system 1, so that the hydraulic pressure of the oil inlet hydraulic manifold 16 is communicated with the oil return hydraulic branch pipe 7 through the oil inlet hydraulic branch pipe 6, and the piston rod 18 of the oil cylinder 5 drives the connecting ball head 1 to push the slide plate mechanism 20 to reciprocate; when the casting reaches the set flow, the three-position four-way valve 2 is powered off and is kept until the casting is finished. When the three-position four-way valve 2 is powered off, a locking effect can be generated, the loops of the oil return hydraulic main pipe 15 and the oil inlet hydraulic main pipe 16 can be closed, and hydraulic pressure is kept to abut against the sliding plate mechanism 20 all the time, so that fixed molten steel outflow is kept until casting is completed.
When the quick action system 1 fails, the manual control action system 11 connected with the quick action system 1 in parallel is manually controlled to complete the step, and a fault is searched for to recover the normal operation. In the method, emergency measures are preset corresponding to the casting working process, the oil cylinder 5 can be driven through the manual control action system 11, the stop valves are also in short connection at the upper end and the lower end of the manual control action system 11 to protect the system, and the method can be used for unloading an oil circuit in the system when the system is not used in normal work.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. An automatic unloading device for an oil cylinder of a steel ladle slide plate mechanism of a continuous casting machine comprises an oil inlet hydraulic main pipe, an oil cylinder and an oil return hydraulic main pipe which are sequentially communicated, wherein a quick action system is connected between the oil cylinder and the oil inlet hydraulic main pipe as well as between the oil cylinder and the oil return hydraulic main pipe; and the quick action system and the two-position four-way valve are in signal connection with a control system.
2. The automatic unloading device for the oil cylinder of the ladle slide plate mechanism of the continuous casting machine according to claim 1, wherein two manual operating systems connected in parallel with the quick operating systems are further arranged between the oil inlet hydraulic branch pipe and the oil return hydraulic branch pipe and between the oil inlet hydraulic main pipe and the oil return hydraulic main pipe, and the quick operating systems are connected in parallel with each other.
3. The automatic unloading device for the oil cylinder of the ladle sliding plate mechanism of the continuous casting machine according to claim 2, wherein the quick action system and the manual control action system respectively comprise a three-position four-way valve, a hydraulic one-way valve and a speed regulating valve which are sequentially communicated.
4. The automatic unloading device for the oil cylinder of the ladle slide mechanism of the continuous casting machine according to claim 3, wherein the two-position four-way valve and the three-position four-way valve in the quick action system are all electromagnetic directional valves.
5. An operating method of the automatic unloading device of the oil cylinder of the ladle slide plate mechanism of the continuous casting machine according to any one of claims 1 to 4, which is characterized by comprising the following steps:
s1, after the molten steel is poured into the ladle, the empty ladle is transferred into a hanging-off area through a ladle turret to be hoisted away by a crane, and at the moment, an operator sends a disassembling instruction through a control system;
s2, the control system sends out an electric signal to electrify the two-position four-way valve, so that the oil pressure of the rod cavity and the rodless cavity of the oil cylinder is unloaded into an oil return hydraulic main pipe, and then the oil pressure is lost;
s3, the control system transmits a detaching signal to the robot system, detaches the oil cylinder and grabs the oil cylinder to return to a standby position to wait for the installation of the next steel ladle;
s4, hoisting the ladle filled with molten steel to a ladle turret of a continuous casting machine, and sending an installation instruction by an operator through a control system;
s5, the control system transmits an installation signal to the robot system, and the robot grabbing oil cylinder is installed on the steel ladle base;
s6, an operator sends a work instruction through the control system, and the quick action system controls the molten steel to flow out of the tundish for casting;
and S7, repeating the step S1 after the casting is finished.
6. The working method of the automatic unloading device for the oil cylinder of the ladle slide plate mechanism of the continuous casting machine according to claim 5, characterized by further comprising the step of accident emergency: after finding the fault of the two-position four-way valve, an operator opens the manual stop valve to carry out manual unloading work, closes the manual stop valve after the manual unloading work is finished, searches for the fault and restores to normal work.
7. The method for operating the automatic unloading device of the oil cylinder of the ladle slide plate mechanism of the continuous casting machine according to claim 5, wherein in the step S4, after the control system sends the installation instruction, an electric signal is sent to the two-position four-way valve to be powered on, then the power is lost, and then the step S5 is carried out.
8. The method for operating the automatic unloading device of the oil cylinder of the ladle sliding plate mechanism of the continuous casting machine according to claim 7, wherein the power-on time of the two-position four-way valve is 8-12 seconds, and the control system is controlled by an operator through a remote operation table and a button thereof.
9. The method of claim 5, wherein in step S6, the fast acting system is controlled by controlling a three-position four-way valve, a hydraulic check valve and a speed regulating valve in the fast acting system, so that the hydraulic pressure of the oil inlet hydraulic main pipe is conducted to the oil return hydraulic branch pipe through the oil inlet hydraulic branch pipe, and the piston rod of the cylinder drives the connecting ball to push the slide mechanism to reciprocate; and when the casting reaches the set flow, the three-position four-way valve is powered off and is kept until the casting is finished.
10. The method for operating the automatic unloading device of the oil cylinder of the ladle slide plate mechanism of the continuous casting machine according to claim 9, wherein when the quick-acting system fails, the manual-control acting system connected in parallel with the quick-acting system is manually controlled to complete the step, and a fault is searched for to recover the normal operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010456516.2A CN111790900A (en) | 2020-05-26 | 2020-05-26 | Automatic unloading device for oil cylinder of steel ladle sliding plate mechanism of continuous casting machine and working method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010456516.2A CN111790900A (en) | 2020-05-26 | 2020-05-26 | Automatic unloading device for oil cylinder of steel ladle sliding plate mechanism of continuous casting machine and working method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113898630A (en) * | 2021-10-09 | 2022-01-07 | 合肥协力液压科技有限公司 | Electromagnetic control multi-way reversing valve |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113898630A (en) * | 2021-10-09 | 2022-01-07 | 合肥协力液压科技有限公司 | Electromagnetic control multi-way reversing valve |
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