CN114771597A - Brake control system of monorail crane - Google Patents
Brake control system of monorail crane Download PDFInfo
- Publication number
- CN114771597A CN114771597A CN202210700924.7A CN202210700924A CN114771597A CN 114771597 A CN114771597 A CN 114771597A CN 202210700924 A CN202210700924 A CN 202210700924A CN 114771597 A CN114771597 A CN 114771597A
- Authority
- CN
- China
- Prior art keywords
- valve
- port
- electromagnetic directional
- way
- brake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61H—BRAKES OR OTHER RETARDING DEVICES SPECIALLY ADAPTED FOR RAIL VEHICLES; ARRANGEMENT OR DISPOSITION THEREOF IN RAIL VEHICLES
- B61H11/00—Applications or arrangements of braking or retarding apparatus not otherwise provided for; Combinations of apparatus of different kinds or types
- B61H11/06—Applications or arrangements of braking or retarding apparatus not otherwise provided for; Combinations of apparatus of different kinds or types of hydrostatic, hydrodynamic, or aerodynamic brakes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61H—BRAKES OR OTHER RETARDING DEVICES SPECIALLY ADAPTED FOR RAIL VEHICLES; ARRANGEMENT OR DISPOSITION THEREOF IN RAIL VEHICLES
- B61H7/00—Brakes with braking members co-operating with the track
- B61H7/02—Scotch blocks, skids, or like track-engaging shoes
- B61H7/04—Scotch blocks, skids, or like track-engaging shoes attached to railway vehicles
- B61H7/06—Skids
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Braking Arrangements (AREA)
- Braking Systems And Boosters (AREA)
Abstract
The invention discloses a brake control system of a monorail crane, which comprises a hydraulic pump, an electromagnetic directional valve I, an electromagnetic directional valve II, an electromagnetic directional valve III, a one-way throttle valve and a brake oil cylinder, wherein the hydraulic pump is connected with a port P of the electromagnetic directional valve I through the one-way valve I, a port A of the electromagnetic directional valve I is connected with the port P of the electromagnetic directional valve II through the one-way valve II, a port B of the electromagnetic directional valve II is connected with a port 2 of the one-way throttle valve, one path of a port 1 of the one-way throttle valve is connected with an oil inlet of the brake oil cylinder through the one-way valve III, the other path of the port is connected to the port P of the electromagnetic directional valve III, and a port B of the electromagnetic directional valve III is connected with an oil inlet of the brake oil cylinder. The interior of the piston of the brake oil cylinder is provided with a two-way cartridge valve. The control system can realize flexible braking of the monorail crane, and prevent other parts from being damaged due to vibration.
Description
Technical Field
The invention relates to the technical field of monorail cranes, in particular to a brake control system of a monorail crane.
Background
The brake device of the monorail crane is characterized in that a brake oil cylinder is pushed to contract by hydraulic oil, so that a spring is compressed, a brake is separated from a rail, and the brake releasing function is realized. In the braking process, the oil of the brake oil cylinder is released, the brake oil cylinder rapidly extends out under the action of the spring, the brake is tightly attached to the rail, and the brake function is realized under the action of the spring. During braking, hydraulic oil is released quickly under the action of a spring, a piston of the brake oil cylinder is violently impacted with a cylinder bottom, so that the brake oil cylinder and a structural member connected with the brake oil cylinder generate violent vibration, and the brake oil cylinder rod and the structural member are easy to crack due to frequent braking during operation of a locomotive.
Disclosure of Invention
The invention aims to provide a brake control system of a monorail crane, which can adopt flexible brake when the monorail crane works normally, avoid vibration and enhance the safety and reliability of control.
In order to achieve the aim, the brake control system of the monorail crane comprises a hydraulic pump, an electromagnetic directional valve I, an electromagnetic directional valve II, an electromagnetic directional valve III, a one-way throttle valve, a brake oil cylinder and an oil tank, the electromagnetic directional valve I, the electromagnetic directional valve II and the electromagnetic directional valve III are all two-position four-way directional valves, the hydraulic pump is connected with a port P of the electromagnetic directional valve I through a one-way valve I, a port A of the electromagnetic directional valve I is connected with a port P of the electromagnetic directional valve II through a one-way valve II, a port B of the electromagnetic reversing valve II is connected with a port 2 of the one-way throttle valve, one path of the port 1 of the one-way throttle valve is connected with an oil inlet of the brake oil cylinder through the one-way valve III, the other path of the port is connected with a port P of the electromagnetic reversing valve III, and the port B of the electromagnetic reversing valve III is connected with an oil inlet of the brake oil cylinder; a spring is sleeved on a brake rod of the brake oil cylinder, a throttling plug and a two-way cartridge valve are arranged inside a piston of the brake oil cylinder, an oil path inside the brake oil cylinder passes through the inside of a piston rod from an oil inlet, one path of the oil path is connected with a port C of the two-way cartridge valve, and a port B is connected with an oil path with a rod cavity; one path is connected to an oil path leading to the rod cavity from the port B of the two-way cartridge valve through the throttle plug; one path is connected to an oil path leading to the rod cavity from the port B of the two-way cartridge valve through a one-way valve IV; and the port A of the two-way cartridge valve is communicated with a rodless cavity, and the rodless cavity is connected with the oil tank.
Furthermore, the hydraulic pump further comprises an overflow valve, wherein the outlet of the hydraulic pump is connected with the port 1 of the one-way valve I, one path of the port 2 is connected with the port P of the electromagnetic reversing valve I, and the other path is connected with the overflow valve.
The beneficial effects of the invention are: the control system is provided with the electromagnetic directional valve II, the electromagnetic directional valve III, the one-way throttle valve and the two-way cartridge valve, so that the braking of the monorail crane in the normal working process can be realized as slow braking, the vibration is reduced, and the damage to parts is prevented; secondly, the rapid braking can be realized in emergency; thirdly, when one of the electromagnetic valves II and III fails, the monorail crane can still brake, so that the safety and reliability of the operation of the whole control system can be improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a brake cylinder braking the monorail crane;
FIG. 3 is a logic diagram of a brake and release implementation;
in the figure, 1-a hydraulic pump, 2-a one-way valve I, 3-an overflow valve, 4-an electromagnetic directional valve I, 5-a one-way valve II, 6-an electromagnetic directional valve II, 7-an electromagnetic directional valve III, 8-a one-way throttle valve, 9-a one-way valve III, 10-a brake cylinder, 11-a throttle plug, 12-a two-way cartridge valve, 13-a one-way valve IV, 14-an oil tank, a-a friction plate, b-a swing arm and c-a spring.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in figure 1, the brake control system of the monorail crane comprises a hydraulic pump 1, an overflow valve 3, an electromagnetic directional valve I4, an electromagnetic directional valve II6, an electromagnetic directional valve III7, a one-way throttle valve 8, a brake oil cylinder 10 and an oil tank 14, wherein the electromagnetic directional valve I4, the electromagnetic directional valve II6 and the electromagnetic directional valve III7 are all two-position four-way directional valves, and the hydraulic pump 1 is a gear pump. The hydraulic pump 1 is connected with a P port of the electromagnetic directional valve I4 through a one-way valve I2, and liquid flows through the one-way valve I2 and flows upwards and does not flow downwards. The port A of the electromagnetic directional valve I4 is connected with the port P of the electromagnetic directional valve II6 through a one-way valve II5, and the flow direction of the one-way valve II5 is opened upwards and closed downwards. A port B of the electromagnetic directional valve II6 is connected with a port 2 of the one-way throttle valve 8, a port 1 of the one-way throttle valve 8 is connected with an oil inlet of the brake oil cylinder 10 through a one-way valve III9, the one-way valve III9 is opened from 1 to 2 and closed from 2 to 1, one path of the one-way valve III9 is connected to a port P of the electromagnetic directional valve III7, and a port B of the electromagnetic directional valve III7 is connected with an oil inlet of the brake oil cylinder 10. A spring is sleeved on a brake rod of the brake oil cylinder 10, a throttle plug 11 and a two-way cartridge valve 12 are arranged inside a piston of the brake oil cylinder 10, an oil path inside the brake oil cylinder 10 passes through the inside of a piston rod from an oil inlet, one path of the oil path is connected with a port C of the two-way cartridge valve 12, and a port B is connected with an oil path with a rod cavity; one way is connected to the oil path of the two-way cartridge valve 12B port to the rod cavity through the throttle plug 11. One path is connected to an oil path leading to the rod cavity from the port B of the two-way cartridge valve through a one-way valve IV 13; the port A of the cartridge valve 12 is communicated with a rodless cavity which is connected with an oil tank 14. The outlet of the hydraulic pump 1 is connected with a port 1 of a check valve I2, one path of the port 2 is connected with a port P of an electromagnetic directional valve I4, the other path is connected with an overflow valve 3, and the overflow valve 3 can adjust the pressure of the brake cylinder 10.
Fig. 2 is a schematic diagram of the brake cylinder 10 in the control system for braking the monorail crane, wherein two ends of the brake cylinder 10 are connected with the swing arm, and the swing arm passes through the telescopic cylinder rod and cooperates with the swing arm b, so as to push the two friction plates a to perform opening and closing actions, and the spring C generates acting force on the expansion of the cylinder rod.
The control principle of the control system is as follows: the slow braking electromagnetic directional valve II6 is powered off, the port B is communicated with the port T and is connected to the oil tank 14, the electromagnetic directional valve III7 is powered on, the port P is communicated with the port B, hydraulic oil in a rod cavity of the braking oil cylinder 10 is divided into two parallel oil paths under the action of spring force, one oil path passes through the throttle plug 11 and passes through the ports 1 to 2 of the one-way valve III9, the ports 1 to 2 of the one-way throttle valve, and the port B to the port T of the electromagnetic directional valve 6 and returns to the oil tank 14.
The other oil path directly acts on the port B at the bottom end of the two-way cartridge valve 12. The hydraulic oil acting on the top end C port generates back pressure through the one-way throttle valve 8, so that the pressures acting on the upper end and the lower end of the two-way cartridge valve 12 form a proportion according to different areas of the two ends of the two-way cartridge valve 12, the opening degree of the two-way cartridge valve 12 of the brake oil cylinder 10 is controlled by manually setting the opening degree of the one-way throttle valve 8 at one time, the rod cavity of the brake oil cylinder 10 is communicated with the rodless cavity, the hydraulic oil in the rod cavity of the brake oil cylinder 10 releases the oil according to the opening degree of the two-way cartridge valve 12 and is discharged into the rodless cavity of the brake oil cylinder 10 under the action of a spring, the hydraulic oil returns to an oil tank 14, and a brake is slowly closed, so that the purpose of slow braking is achieved. The action can prevent the piston from quickly contacting the cylinder bottom to generate vibration under the normal working state of the monorail crane, thereby protecting components from being damaged.
The brake release electromagnetic directional valve II6 and the electromagnetic directional valve III7 are powered on, hydraulic oil enters a piston rod of the brake oil cylinder 10 from a port P to a port B of the electromagnetic directional valve II6, passes through a port 2 to a port 1 of the one-way throttle valve 8, then passes through a port P to a port B of the electromagnetic directional valve III7, enters a rod cavity of the brake oil cylinder 10 through a one-way valve IV13 in the brake oil cylinder 10, the brake oil cylinder 10 drives a spring to contract, a brake is separated, and the brake is released. In addition, as can be seen from the figure 1, ｃA series oil circuit is formed by the hydraulic pump 1, the P-A of the electromagnetic directional valve 4, the P-B of the electromagnetic directional valve 6, the 2-1 of the one-way throttle valve 8, the P-B of the electromagnetic directional valve 6 and an oil cylinder cavity entering the brake oil cylinder 10, and as long as any one electromagnetic valve of the electromagnetic directional valve II6 and the electromagnetic directional valve III7 has ｃA fault, the single-rail crane cannot release braking, so that the safety of the whole single-rail crane can be effectively ensured.
Thirdly, the quick braking electromagnetic directional valve II6 and the electromagnetic directional valve III7 are powered off, a port B of the electromagnetic valve II6 is communicated with a port T and is connected to the oil tank 14, a port B of the electromagnetic valve II7 is communicated with the port T and is connected to the oil tank 14, hydraulic oil in a rod cavity of the braking oil cylinder 10 is divided into two parallel oil paths under the action of a spring, one oil path passes through the throttling plug 11 and returns to the oil tank 14 from the port B to the port T of the electromagnetic directional valve III7 so as to unload the pressure of a port C of the two-way cartridge valve, the action force of the port A is larger than that of the port C, the two-way cartridge valve is ensured to move upwards, and the large cavity and the small cavity of the braking oil cylinder are unblocked; the other oil path directly acts on the port B of the two-way cartridge valve 12, hydraulic oil acting on the port C of the two-way cartridge valve 12 generates pressure drop through the throttle plug 11, the pressure of the hydraulic oil is smaller than that of the hydraulic oil acting on the port B, the two-way cartridge valve 12 moves upwards, the two-way cartridge valve 12 is fully opened, a rod cavity of the brake oil cylinder 10 is communicated with the side of a rodless cavity, the hydraulic oil with the rod cavity of the brake oil cylinder 10 is rapidly discharged into the rodless cavity of the brake oil cylinder 10 under the action of a spring and returns to the oil tank 14, and therefore the brake is rapidly closed. This quick braking action is applied in situations where emergency braking is required in an emergency situation.
Regarding the braking action, as can be seen from fig. 1, the hydraulic oil in the rod cavity of the brake cylinder 10 returns through the two-way cartridge valve 12 under the action of the spring, and the oil returning path is used as the control oil path of the two-way cartridge valve 12 through the throttle plug 11 inside the brake cylinder 10, and this control oil path is a parallel oil path: a first parallel oil path, namely a brake cylinder 10 with a rod cavity, a throttle plug 11, 1 to 2 ports of a one- way valve 9, 1 to 2 ports of a one-way throttle valve 8 and a B port to a T port of an electromagnetic directional valve II6 return to an oil tank 14; and a second parallel oil path, namely a brake cylinder 10 with a rod cavity, a throttle plug 11 and a port B to a port T of the electromagnetic directional valve III7, returns to the oil tank 14.
The oil way returning from the bottom of the two-way cartridge valve 12 is a main oil return oil way, the movement speed of the brake oil cylinder 10 is controlled by the opening degree of the two-way cartridge valve 12, and the failure of any one electromagnetic valve can be realized through the parallel connection of the electromagnetic valves 6 and 7, so that the brake can be realized, and a safety protection is provided for the operation of a monorail crane.
In fig. 3, Y1 represents the electromagnetic directional valve I4, Y2 represents the electromagnetic directional valve II6, and Y3 represents the electromagnetic directional valve III7, and it can be seen from the logic in the figure that the braking can be released only when the electromagnetic directional valve II6 and the electromagnetic directional valve III7 are both powered, and the release cannot be realized if there is a damage; one of the electromagnetic reversing valve II6 and the electromagnetic reversing valve III7 is damaged, and the brake of the monorail crane is not influenced. The two conditions can effectively ensure the safety and the reliability of the operation of the monorail crane.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes which can be made within the knowledge of those skilled in the art without departing from the gist of the present invention are within the scope of the claims of the present invention.
Claims (2)
1. The utility model provides a monorail crane locomotive brake control system which characterized in that: the hydraulic brake system comprises a hydraulic pump (1), an electromagnetic directional valve I (4), an electromagnetic directional valve II (6), an electromagnetic directional valve III (7), a one-way throttle valve (8), a brake oil cylinder (10) and an oil tank (14), wherein the electromagnetic directional valve I (4), the electromagnetic directional valve II (6) and the electromagnetic directional valve III (7) are all two-position four-way directional valves, the hydraulic pump (1) is connected with a port P of the electromagnetic directional valve I (4) through a one-way valve I (2), a port A of the electromagnetic directional valve I (4) is connected with the port P of the electromagnetic directional valve II (6) through a one-way valve II (5), a port B of the electromagnetic directional valve II (6) is connected with a port 2 of the one-way throttle valve (8), one path of the port 1 of the one-way throttle valve (8) is connected with an oil inlet of the brake oil cylinder (10) through the one-way valve III (9), and the other path is connected with the port P of the electromagnetic directional valve III (7), the port B of the electromagnetic reversing valve III (7) is connected with an oil inlet of the brake oil cylinder (10); a spring is sleeved on a brake rod of the brake oil cylinder (10), a throttling plug (11) and a two-way cartridge valve (12) are arranged inside a piston of the brake oil cylinder (10), an oil path inside the brake oil cylinder (10) passes through the inside of the piston rod from an oil inlet, one path of the oil path is connected with a port C of the two-way cartridge valve (12), and a port B is connected with an oil path with a rod cavity; one path is connected to an oil path leading to a rod cavity from a port B of the two-way cartridge valve (12) through the throttle plug (11); one path is connected to an oil path leading to the rod cavity from the port B of the two-way cartridge valve through a one-way valve IV (13); the port A of the two-way cartridge valve is communicated with a rodless cavity, and the rodless cavity is connected with the oil tank (14).
2. The monorail crane brake control system of claim 1, wherein: the hydraulic control system is characterized by further comprising an overflow valve (3), wherein the outlet of the hydraulic pump (1) is connected with a port 1 of the one-way valve I (2), one path of the port 2 is connected with a port P of the electromagnetic directional valve I (4), and the other path is connected with the overflow valve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210700924.7A CN114771597B (en) | 2022-06-21 | 2022-06-21 | Single track loop wheel machine braking control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210700924.7A CN114771597B (en) | 2022-06-21 | 2022-06-21 | Single track loop wheel machine braking control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114771597A true CN114771597A (en) | 2022-07-22 |
| CN114771597B CN114771597B (en) | 2022-09-02 |
Family
ID=82420582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210700924.7A Active CN114771597B (en) | 2022-06-21 | 2022-06-21 | Single track loop wheel machine braking control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114771597B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0424684A2 (en) * | 1989-10-27 | 1991-05-02 | Walter Becker GmbH | Brake carriage of a mining rail track or aerial railway |
| CN103482477A (en) * | 2013-10-09 | 2014-01-01 | 安徽中捷矿山运输设备有限责任公司 | Hydraulic control system of monorail crane locomotive |
| CN109578360A (en) * | 2018-12-29 | 2019-04-05 | 沙尔夫矿山机械（徐州）有限公司 | A kind of Novel diesel engine monorail crane auxiliary system hydraulic control valve |
| CN214742496U (en) * | 2021-04-13 | 2021-11-16 | 贵州大学 | Electric control hydraulic braking system with speed regulation and buffering functions for monorail crane |
| CN114475669A (en) * | 2021-11-22 | 2022-05-13 | 徐州徐工基础工程机械有限公司 | Automatic variable-drive control system of monorail crane |
-
2022
- 2022-06-21 CN CN202210700924.7A patent/CN114771597B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0424684A2 (en) * | 1989-10-27 | 1991-05-02 | Walter Becker GmbH | Brake carriage of a mining rail track or aerial railway |
| CN103482477A (en) * | 2013-10-09 | 2014-01-01 | 安徽中捷矿山运输设备有限责任公司 | Hydraulic control system of monorail crane locomotive |
| CN109578360A (en) * | 2018-12-29 | 2019-04-05 | 沙尔夫矿山机械（徐州）有限公司 | A kind of Novel diesel engine monorail crane auxiliary system hydraulic control valve |
| CN214742496U (en) * | 2021-04-13 | 2021-11-16 | 贵州大学 | Electric control hydraulic braking system with speed regulation and buffering functions for monorail crane |
| CN114475669A (en) * | 2021-11-22 | 2022-05-13 | 徐州徐工基础工程机械有限公司 | Automatic variable-drive control system of monorail crane |
Non-Patent Citations (1)
| Title |
|---|
| 曹军: "DC120Y型防爆柴油机单轨吊机车驱动***及制动***设计", 《煤炭与化工》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114771597B (en) | 2022-09-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102602385B (en) | Parking braking system and engineering machinery | |
| US8322375B2 (en) | Control device and hydraulic pilot control | |
| CN201560992U (en) | Pilot-operated hydraulic lock multi-way directional valve set | |
| CN101537984B (en) | Hoist motor closed type hydraulic system for preventing pipelines from bursting and control method thereof | |
| US9822805B2 (en) | Hydraulic cylinder for use for example in a hydraulic tool | |
| CN102859080A (en) | Double check valve for construction equipment | |
| CN104591012A (en) | Hydraulic control system for single cylinder pin type telescopic boom and engineering machinery | |
| CN105003715A (en) | Brake valve electro-hydraulic drive system with emergency shut valve function and brake valve | |
| CN202381448U (en) | Hydraulic oil cylinder and hydraulic system | |
| CN101085667A (en) | Opening-closing control mechanism for single-rope bucket grab | |
| CN101446307B (en) | Mechanical feedback plug-in mounting type proportional throttle valve system | |
| CN114771597B (en) | Single track loop wheel machine braking control system | |
| CN104154056A (en) | High-flow hydraulic reversing loop with interlocking function | |
| CN102748506B (en) | Electro-hydraulic pilot control switch valve bank | |
| CN203978967U (en) | A kind of high-volume hydraulic commutation loop with interlocking function | |
| CN112173994A (en) | Control valve unit, hydraulic control loop and engineering equipment with telescopic crane boom | |
| CN201391504Y (en) | Safety hydraulic oil cylinder | |
| CN201344161Y (en) | Mechanical-feedback plug-in proportional throttle valve | |
| CN201433066Y (en) | Pipeline crack prevention closed type hydraulic system of winding motor | |
| CN111120242A (en) | Hydraulic control linkage pressurization injection device | |
| CN201288882Y (en) | Hydraulic controlled piston type water-attack discharging valve | |
| CN204284053U (en) | For guide's oil circuit relief arrangement and the pilot hydraulic control system of virtual wall function | |
| CN204324753U (en) | The protecting against shock type unloading electromagnetic valve of straight-arm lorry-mounted crane | |
| CN210127980U (en) | Converter slide pushing off slag hydraulic control device | |
| JP6909743B2 (en) | Steam valve drive |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |