CN113266616B - Hydraulic control system and method for roller press - Google Patents
Hydraulic control system and method for roller press Download PDFInfo
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- CN113266616B CN113266616B CN202110712201.4A CN202110712201A CN113266616B CN 113266616 B CN113266616 B CN 113266616B CN 202110712201 A CN202110712201 A CN 202110712201A CN 113266616 B CN113266616 B CN 113266616B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims description 54
- 239000000463 material Substances 0.000 claims description 16
- 230000009471 action Effects 0.000 claims description 13
- 238000005096 rolling process Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000013589 supplement Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 6
- 239000004566 building material Substances 0.000 abstract description 2
- 238000005065 mining Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 395
- 230000000694 effects Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 239000010724 circulating oil Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/32—Adjusting, applying pressure to, or controlling the distance between, milling members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/22—Synchronisation of the movement of two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/01—Locking-valves or other detent i.e. load-holding devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/027—Check valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/005—Filling or draining of fluid systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/008—Reduction of noise or vibration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
- F15B2013/0448—Actuation by solenoid and permanent magnet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/8606—Control during or prevention of abnormal conditions the abnormal condition being a shock
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/8613—Control during or prevention of abnormal conditions the abnormal condition being oscillations
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Food Science & Technology (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic control system and a hydraulic control method for a roller press, and relates to a hydraulic control system and a hydraulic control method for a roller press and a high-pressure roller mill, which are suitable for building materials and mining industries. According to the hydraulic control system and method for the roller press, the oil tank with the rod cavity is connected with the oil cylinder to be matched with the balance valve, so that the balance valve can be controlled in time when a roller is broken or crushed, oil is limited in the rod cavity and supports the piston of the oil cylinder, the generated impact is reduced, and the service life of the roller press is prolonged.
Description
Technical Field
The invention relates to the field of hydraulic pressure, in particular to a hydraulic control system and a hydraulic control method for a roller press and a high-pressure roller mill for building materials and mining industries.
Background
The roller press (also called as high-pressure roller mill) is composed of two extrusion rollers which rotate synchronously in opposite directions, one is a fixed roller and the other is a movable roller, and materials are crushed by the pressure between the two rollers through the gap between the fixed roller and the movable roller of the roller press. Under normal working conditions, the width of the roll gap between the two rolls is certain, if the conditions of uneven incoming materials, broken materials and the like occur, the support of materials is lacking between the two rolls, the roll gap can be rapidly reduced under the action of a hydraulic system, the rolls shake and generate larger impact, the roll press is greatly influenced, such as a host machine frame, a roll bearing, a hydraulic system and the like, and the service life of the roll press is reduced.
Disclosure of Invention
The invention aims at: according to the hydraulic control system and the hydraulic control method for the roller press, provided by the invention, the oil tank with the rod cavity is connected with the oil cylinder to be matched with the balance valve, so that the balance valve can be controlled in time when the roller is broken or crushed, the oil is limited in the rod cavity and the piston of the oil cylinder is supported, the generated impact is reduced, and the service life of the roller press is further prolonged.
The technical scheme adopted by the invention is as follows:
The hydraulic control system of the roller press comprises a driving roller, a driven roller, an energy accumulator, an oil cylinder and an oil pump, wherein the oil pump is respectively connected with a rod cavity and a rodless cavity of the oil cylinder through a first electromagnetic reversing valve to form a hydraulic control oil path, a second electromagnetic reversing valve is arranged between the first electromagnetic reversing valve and the rodless cavity, the energy accumulator is arranged between the second electromagnetic reversing valve and the oil cylinder, and a three-position four-way electrohydraulic reversing valve is arranged between the first electromagnetic reversing valve and the rodless cavity; the oil cylinder comprises a transmission side oil cylinder and a non-transmission side oil cylinder, the driving roller and the driven roller are oppositely arranged at two ends of the driving roller, a piston of the transmission side oil cylinder is connected with and controls the transmission side of the driving roller, a piston of the non-transmission side oil cylinder is connected with and controls the non-transmission side of the driving roller, and the hydraulic control oil way regulates and controls the oil quantity in a rod cavity and a rodless cavity of the oil cylinder, so that the transmission side oil cylinder and the non-transmission side oil cylinder are mutually matched to control the width of a roller gap between the driving roller and the driven roller, and the oil cylinder is characterized in that: the control oil way of the balance valve is communicated with the rodless cavity of the oil cylinder; when the width of the roll gap is narrowed, the pressure of the rodless cavity is reduced and acts on the balance valve, so that the oil in the rod cavity is not discharged along the balance valve, the oil in the rod cavity keeps constant value and supports the oil cylinder piston, and the impact when the width of the roll gap is narrowed is reduced.
By adopting the technical scheme, when the rolling machine breaks materials or scraps, larger impact can be generated, the piston in the oil cylinder stretches out, the pressure in the rodless cavity is reduced, the pressure of a control oil way of the balance valve communicated with the rodless cavity is reduced along with the pressure of the control oil way of the balance valve, the balance valve is reversed to a working position of the one-way valve under the action of the spring, oil in the rod cavity does not flow to an oil return way along the balance valve any more, the oil in the rod cavity keeps a fixed value and supports the oil cylinder piston, the impact when the width of a roll gap is narrowed and the vibration of equipment are reduced, the driving roll and the driven roll are enabled to run stably, a host frame, a roll bearing and an energy accumulator are protected, and the service life of the equipment is effectively prolonged.
Further, a rod cavity oil way is formed by connecting a rod cavity of the transmission side oil cylinder with a rod cavity of the non-transmission side oil cylinder in parallel, the rod cavity oil way is connected with two branches, one branch is communicated with an oil outlet of the oil tank to form an oil inlet path, the other branch is communicated with an oil inlet of the oil tank through a balance valve to form an oil return path, a control oil way of the balance valve is communicated with the rod cavity oil way, control oil acts on the balance valve through the control oil way of the balance valve, and a throttle valve working position of the balance valve works to enable oil in the rod cavity to enter the oil return path along the balance valve.
By adopting the technical scheme, synchronous control of the transmission side oil cylinder and the non-transmission side oil cylinder can be realized, a hydraulic control system is simplified, and when a rolling machine breaks materials or crushed aggregates, the pressure difference of rodless cavities of the transmission side oil cylinder and the non-transmission side oil cylinder is reduced together, and the effect of reducing the pressure is overlapped due to parallel arrangement, so that the response speed of the balance valve can be improved.
Further, a hydraulic control one-way valve is arranged between the balance valve and an oil inlet of the oil tank, a control oil way of the hydraulic control one-way valve is communicated with an oil way of the rodless cavity, control oil acts on the hydraulic control one-way valve through a control oil way of the hydraulic control one-way valve, and the hydraulic control one-way valve is in an open state, so that the oil in the rod cavity returns to the oil tank.
By adopting the technical scheme, when the roller press works normally, the control oil acts on the hydraulic control one-way valve through the control oil way of the hydraulic control one-way valve, and the hydraulic control one-way valve is opened, at the moment, the oil with the rod cavity returns to the oil tank through the balance valve and the hydraulic control one-way valve, and a circulating oil way is formed among the oil tank, the balance valve and the hydraulic control one-way valve, so that the oil is not required to be replenished into the oil tank in the normal use process.
Further, a pull roll branch is arranged between the balance valve and the hydraulic control one-way valve, the three-position four-way electrohydraulic reversing valve is arranged on the pull roll branch, and when a roll gap is pulled, pressure oil enters a rod cavity through the three-position four-way electrohydraulic reversing valve and the balance valve and pushes a piston to retract, so that the roll gap width is increased.
By adopting the technical scheme, the three-position four-way electro-hydraulic reversing valve is switched, so that pressure oil can be injected into the rod cavity of the oil cylinder when the roll gap needs to be pulled, and the piston of the oil cylinder is retracted to pull the roll gap.
Further, a control oil way of the balance valve is communicated with a control oil way of the hydraulic control one-way valve to form a main control oil way, and a third electromagnetic reversing valve is arranged on the main control oil way; when the third electromagnetic reversing valve is powered on, the main control oil way is limited, so that the control oil cannot act on the balance valve and the hydraulic control one-way valve along the main control oil way.
Due to the adoption of the technical scheme, when the roller press works normally, the third electromagnetic directional valve is not electrified, the control oil acts on the balance valve and the hydraulic control one-way valve, the throttle valve working position in the balance valve works and is in an open state, and the oil with the rod cavity is allowed to return to the oil tank through the balance valve and the hydraulic control one-way valve; when the roll gap is pulled by the roll squeezer, the third electromagnetic directional valve is powered on, the main control oil way is cut off, the control oil does not act on the balance valve and the hydraulic control one-way valve, the balance valve is switched to the working position of the one-way valve under the action of the spring, the hydraulic control one-way valve is closed, the pressure oil cannot flow into the oil tank, and only the pressure oil can quickly enter the rod cavity of the oil cylinder through the working position of the one-way valve, so that the piston of the oil cylinder is retracted to pull the roll gap.
Further, a one-way throttle valve is arranged between the balance valve and the pull roll branch, and the flow passing through the balance valve is regulated.
By adopting the technical scheme, the flow passing through the balance valve can be regulated through the one-way throttle valve, the movement speed of the piston in the oil cylinder is limited, and the shaking phenomenon of the oil cylinder can be effectively eliminated.
Further, the one-way throttle valve comprises an oil return one-way throttle valve and a pressure oil one-way throttle valve, the oil return one-way throttle valve is connected with the pressure oil one-way throttle valve in series, the oil return one-way throttle valve is arranged at one end close to the balance valve, and the pressure oil one-way throttle valve is arranged at one end close to the three-position four-way electrohydraulic reversing valve.
By adopting the technical scheme, the oil return one-way throttle valve adjusts the flow of the oil which enters the oil return channel through the balance valve and flows back to the oil tank, the pressure oil one-way throttle valve adjusts the flow which enters the rod cavity of the oil cylinder through the three-position four-way electrohydraulic reversing valve and the balance valve, and the two valves are connected in series to jointly adjust and control the flow of the balance valve, so that the movement speed of the piston in the oil cylinder is limited, and the shaking phenomenon of the oil cylinder can be effectively eliminated.
Further, a filling valve is arranged at the oil outlet of the oil tank, and the filling valve prevents oil from flowing back to the oil tank along the oil outlet.
By adopting the technical scheme, when the check valve working position of the balance valve works, oil in the rod cavity cannot pass through the balance valve, and under the action of pressure, the oil can flow back to the oil tank along the oil outlet of the oil tank and cannot play a role in supporting the oil cylinder piston, so that the liquid filling valve is arranged, the oil is prevented from flowing back to the oil tank along the oil outlet of the oil tank, the oil quantity in the rod cavity is ensured to be a certain value when the check valve working position of the balance valve works, and the effect in supporting the oil cylinder piston is achieved.
Correspondingly, the invention also discloses a hydraulic control method of the roller press, which comprises the following steps:
Normal working steps are as follows: the oil tank supplies oil to the oil cylinder, so that the rod cavity of the oil cylinder is filled with oil, air in the rod cavity is discharged, the electromagnetic directional valve is not electrified, the control oil acts on the balance valve and the hydraulic control one-way valve, the throttle valve working position of the balance valve works, the hydraulic control one-way valve is opened, the oil in the rod cavity returns to the oil tank through the balance valve and the hydraulic control one-way valve, and when the roll gap is enlarged, the oil tank supplements the oil to the rod cavity of the oil cylinder;
An anti-impact step: under the condition that the rolling machine breaks materials or scraps, the balance valve controls the pressure of an oil way to drop, the balance valve is reversed to a check valve working position under the action of a spring, an oil return way is cut off, the impact of a roller is stopped, and when the pressure of the balance valve controls the oil way to rise back, the balance valve is reversed to a throttle valve working position, and the rolling machine works normally.
By adopting the technical scheme, the impact and vibration generated by the roller under the condition of broken materials or crushed aggregates can be reduced through the impact prevention step, the main machine frame, the roller bearing and the energy accumulator are protected, and the service life of the equipment is effectively prolonged.
Further, also comprises
And (3) roll seam pulling step: the electromagnetic reversing valve is electrified to cut off the main control oil way, the control oil does not act on the balance valve and the hydraulic control one-way valve, the balance valve is reversed to the working position of the one-way valve under the action of the spring, the hydraulic control one-way valve is closed, the electromagnet a of the three-position four-way electrohydraulic reversing valve is electrified, and the pressure oil enters a rod cavity of the oil cylinder through the electromagnetic reversing valve and the balance valve, so that the piston of the oil cylinder is retracted and pulled to open a roll gap.
By adopting the technical scheme, the pressure oil can be rapidly fed into the rod cavity of the oil cylinder through the working position of the one-way valve, and the efficiency of roller gap pulling is improved.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. the invention can make the balance valve support the cylinder in time when the roller breaks the materials or breaks the materials, make the roller run stably, reduce the impact and the vibration of the equipment, protect the host frame, the roller bearing and the energy accumulator, and effectively prolong the service life of the equipment.
2. The invention does not need to supplement oil into the oil tank.
3. According to the invention, when the roll gap is required to be pulled, the pressure oil can be quickly injected into the rod cavity of the oil cylinder, and the piston of the oil cylinder is retracted to pull the roll gap.
4. The invention can regulate the flow passing through the balance valve, limit the speed of the piston movement in the oil cylinder and effectively eliminate the shaking phenomenon of the oil cylinder.
5. The invention can adjust the flow of the three-position four-way electro-hydraulic reversing valve, and avoid the phenomenon that the pressure of pressure oil is overlarge to form larger impact force to impact the oil cylinder when the roll gap is pulled.
6. The invention can prevent the oil in the oil cylinder from flowing back to the oil tank from the oil outlet.
Drawings
Fig. 1 is a schematic structural diagram of a hydraulic control system of a roll squeezer of the present invention.
The marks in the figure: 1-accumulator, 2-first throttle valve, 3-cylinder, 4-oil tank, 5-charging valve, 6-third electromagnetic directional valve, 7-balance valve, 8-return oil one-way throttle valve, 9-pressure oil one-way throttle valve, 10-three-position four-way electrohydraulic directional valve, 11-hydraulic control one-way valve, 12-second electromagnetic directional valve, 13-one-way valve, 14-second throttle valve, 15-first electromagnetic directional valve, 16-oil pump and X-control oil.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
The hydraulic control system of the roller press comprises a driving roller, a driven roller, an energy accumulator 1, an oil cylinder 3 and an oil pump 16, wherein the oil pump 16 is respectively connected with a rod cavity and a rodless cavity of the oil cylinder 3 through a first electromagnetic directional valve 15, a second throttle valve 14 and a one-way valve 13 to form a hydraulic control oil path, the second throttle valve 14 can control the flow of the first electromagnetic directional valve 15 to avoid the shaking of the oil cylinder 3 caused by overlarge flow, the one-way valve 13 prevents oil from flowing back to the oil pump through the first electromagnetic directional valve 15, a second electromagnetic directional valve 12 is arranged between the first electromagnetic directional valve 15 and the rodless cavity, the energy accumulator 1 is arranged between the second electromagnetic directional valve 12 and the oil cylinder 3, a first throttle valve 2 is arranged between the energy accumulator 1 and the oil cylinder 3, and the first throttle valve 2 is used for adjusting the flow between the energy accumulator 1 and the oil cylinder 3, so that the shaking of the oil cylinder 3 can be effectively eliminated. When the rodless cavity is filled with oil, the first electromagnetic directional valve 15 and the second electromagnetic directional valve 12 are powered, and oil of the oil pump enters the rodless cavity of the oil tank through the first electromagnetic directional valve 15, the second throttle valve 14, the one-way valve 13, the second electromagnetic directional valve 12 and the first throttle valve 2. The three-position four-way electro-hydraulic reversing valve 10 is arranged between the first electromagnetic reversing valve 15 and the rodless cavity, when a roll gap is pulled, the first electromagnetic reversing valve 15 is electrified, the second electromagnetic reversing valve 12 is not electrified, the electromagnet a of the three-position four-way electro-hydraulic reversing valve 10 is electrified, and oil of the oil pump 16 enters the rod cavity of the oil cylinder 3 through the first electromagnetic reversing valve 15, the second throttling valve 14, the one-way valve 13 and the three-position four-way electro-hydraulic reversing valve 10 to pull the roll gap. The oil cylinder 3 comprises a transmission side oil cylinder and a non-transmission side oil cylinder, the transmission side and the non-transmission side are oppositely arranged at two ends of the driving roller, a piston of the transmission side oil cylinder is connected with and controls the transmission side of the driving roller, a piston of the non-transmission side oil cylinder is connected with and controls the non-transmission side of the driving roller, the hydraulic control oil way regulates and controls the oil quantity in a rod cavity and a rodless cavity of the oil cylinder 3, the transmission side oil cylinder and the non-transmission side oil cylinder are mutually matched to control the roll gap width between the driving roller and the driven roller, the rod cavity of the oil cylinder 3 is connected with two branches, one branch is communicated with an oil outlet of the oil tank 4 to form an oil inlet way, the other branch is communicated with an oil inlet of the oil tank 4 through a balance valve 7 to form an oil return way, and a control oil way of the balance valve 7 is communicated with the rodless cavity of the oil cylinder 3; when the width of the roll gap is narrowed, the pressure of the rodless cavity is reduced and acts on the balance valve 7, so that the oil in the rod cavity does not flow out along the balance valve 7, the oil in the rod cavity keeps constant value and supports the piston of the oil cylinder 3, and the impact when the width of the roll gap is narrowed is reduced. Specifically, when the rolling machine breaks materials or breaks materials, larger impact can be generated, at the moment, the piston in the oil cylinder 3 stretches out, the pressure in the rodless cavity is reduced, the pressure of a control oil path of the balance valve 7 communicated with the rodless cavity is also reduced, the balance valve 7 is switched to a working position of the one-way valve under the action of the spring, so that oil in the rod cavity does not flow to an oil return path along the balance valve 7 any more, the oil in the rod cavity keeps a constant value and supports the piston of the oil cylinder 3, the impact when the width of a roll gap is narrowed and the vibration of equipment are reduced, the driving roll and the driven roll are enabled to run stably, a host frame, a roll bearing and an energy accumulator are protected, and the service life of the equipment is effectively prolonged.
The rod cavity of the transmission side oil cylinder is connected with the rod cavity of the non-transmission side oil cylinder in parallel to form a rod cavity oil way, the rod cavity oil way is connected with two branches, one branch is communicated with an oil outlet of the oil tank 4 to form an oil inlet path, the other branch is communicated with an oil inlet of the oil tank 4 through a balance valve 7 to form an oil return path, a control oil way of the balance valve 7 is communicated with the rod cavity oil way, control oil X acts on the balance valve 7 through the control oil way of the balance valve 7, and a throttle valve working position of the balance valve 7 works to enable oil in the rod cavity to enter the oil return path along the balance valve 7. Specifically, synchronous control of the transmission side oil cylinder and the non-transmission side oil cylinder can be realized, a hydraulic control system is simplified, and when a rolling machine breaks materials or breaks materials, the pressure difference of rodless cavities of the transmission side oil cylinder and the non-transmission side oil cylinder is reduced together, and the effect of reducing the pressure is overlapped due to the parallel arrangement, so that the response speed of the balance valve 7 can be improved.
A hydraulic control one-way valve 11 is arranged between the balance valve 7 and an oil inlet of the oil tank 4, a control oil way of the hydraulic control one-way valve 11 is communicated with a rodless cavity oil way, control oil X acts on the hydraulic control one-way valve 11 through the control oil way of the hydraulic control one-way valve 11, the hydraulic control one-way valve 11 is in an open state, and oil in a rod cavity returns to the oil tank 4. Specifically, when the roller press works normally, the control oil X acts on the hydraulic control one-way valve 11 through the corresponding control oil way, the hydraulic control one-way valve 11 is opened, at the moment, the oil with the rod cavity returns to the oil tank 4 through the balance valve 7 and the hydraulic control one-way valve 11, a circulating oil way is formed among the oil tank 4, the balance valve 7 and the hydraulic control one-way valve 11, and the oil is not required to be replenished into the oil tank 4 in the normal use process.
A one-way throttle valve is arranged between the balance valve 7 and the pull roll branch and used for adjusting the flow passing through the balance valve, and the one-way throttle valve comprises an oil return one-way throttle valve 8. Specifically, the oil flow rate of the oil flowing back to the oil tank 5 through the balance valve and the oil return channel is regulated by the oil return one-way throttle valve 8, so that the movement speed of the piston in the oil cylinder 3 is limited, and the shaking phenomenon of the oil cylinder 3 can be effectively eliminated.
A filling valve 5 is arranged at the oil outlet of the oil tank 4, and the filling valve 5 prevents oil from flowing back to the oil tank 4 along the oil outlet. Specifically, when the check valve working position of the balance valve 7 works, oil in the rod cavity cannot pass through the balance valve 7, and under the action of pressure, the oil can flow back to the oil tank 4 along the oil outlet of the oil tank 4 and cannot play a role in supporting the piston of the oil cylinder 3, so the liquid filling valve 5 is arranged, the oil is prevented from flowing back to the oil tank along the oil outlet of the oil tank 4, the oil quantity in the rod cavity is ensured to be a certain value when the check valve working position of the balance valve 7 works, and the effect in supporting the piston of the oil cylinder 3 is achieved.
Example 2
The hydraulic control system of the roller press comprises a driving roller, a driven roller, an energy accumulator 1, an oil cylinder 3 and an oil pump 16, wherein the oil pump 16 is respectively connected with a rod cavity and a rodless cavity of the oil cylinder 3 through a first electromagnetic directional valve 15 to form a hydraulic control oil way, a second electromagnetic directional valve 12 is arranged between the first electromagnetic directional valve 15 and the rodless cavity, and the energy accumulator 1 is arranged between the second electromagnetic directional valve 12 and the oil cylinder 3; the oil cylinder 3 comprises a transmission side oil cylinder and a non-transmission side oil cylinder, the transmission side and the non-transmission side are oppositely arranged at two ends of the driving roller, a piston of the transmission side oil cylinder is connected with and controls the transmission side of the driving roller, a piston of the non-transmission side oil cylinder is connected with and controls the non-transmission side of the driving roller, the hydraulic control oil way regulates and controls the oil quantity in a rod cavity and a rodless cavity of the oil cylinder 3, the transmission side oil cylinder and the non-transmission side oil cylinder are mutually matched to control the roll gap width between the driving roller and the driven roller, the rod cavity of the oil cylinder 3 is connected with two branches, one branch is communicated with an oil outlet of the oil tank 4 to form an oil inlet way, the other branch is communicated with an oil inlet of the oil tank 4 through a balance valve 7 to form an oil return way, and a control oil way of the balance valve 7 is communicated with the rodless cavity of the oil cylinder 3; when the width of the roll gap is narrowed, the pressure of the rodless cavity is reduced and acts on the balance valve 7, so that the oil in the rod cavity does not flow out along the balance valve 7, the oil in the rod cavity keeps constant value and supports the piston of the oil cylinder 3, and the impact when the width of the roll gap is narrowed is reduced.
The rod cavity of the transmission side oil cylinder is connected with the rod cavity of the non-transmission side oil cylinder in parallel to form a rod cavity oil way, the rod cavity oil way is connected with two branches, one branch is communicated with an oil outlet of the oil tank 4 to form an oil inlet path, the other branch is communicated with an oil inlet of the oil tank 4 through a balance valve 7 to form an oil return path, a control oil way of the balance valve 7 is communicated with the rod cavity oil way, control oil X acts on the balance valve 7 through the control oil way of the balance valve 7, and a throttle valve working position of the balance valve 7 works to enable oil in the rod cavity to enter the oil return path along the balance valve 7.
A hydraulic control one-way valve 11 is arranged between the balance valve 7 and an oil inlet of the oil tank 4, a control oil way of the hydraulic control one-way valve 11 is communicated with a rodless cavity oil way, control oil X acts on the hydraulic control one-way valve 11 through the control oil way of the hydraulic control one-way valve 11, the hydraulic control one-way valve 11 is in an open state, and oil in a rod cavity returns to the oil tank 4.
And a pull roll branch is arranged between the balance valve 7 and the hydraulic control one-way valve 11, the three-position four-way electro-hydraulic reversing valve 10 is arranged on the pull roll branch, when a roll gap is pulled, an electromagnet a of the three-position four-way electro-hydraulic reversing valve 10 is electrified, and pressure oil enters a rod cavity through the three-position four-way electro-hydraulic reversing valve 10 and the balance valve 7 and pushes a piston to retract, so that the roll gap width is increased. Specifically, by switching the three-position four-way electro-hydraulic reversing valve 10, pressure oil can be injected into the rod cavity of the oil cylinder 3 when the roll gap is required to be pulled, the piston of the oil cylinder 3 is retracted to pull the roll gap, and when the roll press works normally, the three-position four-way electro-hydraulic reversing valve 10 is positioned at the middle position, and the oil cannot pass through the three-position four-way electro-hydraulic reversing valve 10.
The control oil way of the balance valve 7 is communicated with the control oil way of the hydraulic control one-way valve 11 to form a main control oil way, and a third electromagnetic reversing valve 6 is arranged on the main control oil way; when the third electromagnetic directional valve 6 is powered on, the main control oil way is limited, so that the control oil X cannot act on the balance valve 7 and the hydraulic control one-way valve 11 along the main control oil way. Specifically, when the roller press works normally, the third electromagnetic directional valve 6 is not electrified, the control oil X acts on the balance valve 7 and the hydraulic control one-way valve 11, the throttle valve working position in the balance valve 7 works, and the oil with a rod cavity is in an open state and is allowed to return to the oil tank 4 through the balance valve 7 and the hydraulic control one-way valve 11; when the roll gap is pulled by the roll squeezer, the third electromagnetic directional valve 6 is powered on, the main control oil way is cut off, the control oil X does not act on the balance valve 7 and the hydraulic control one-way valve 11 for control any more, the balance valve 7 is switched to the one-way valve working position under the action of the spring, the hydraulic control one-way valve 11 is closed, the pressure oil cannot flow into the oil tank 4, and only the pressure oil can quickly enter the rod cavity of the oil cylinder 3 through the one-way valve working position, so that the piston of the oil cylinder 3 is retracted to pull the roll gap.
The balance valve 7 is followed by a one-way throttle valve comprising an oil return one-way throttle valve 8 for controlling the flow of oil under pressure along the balance valve 7 back to the tank 4 and a pressure oil one-way throttle valve 9 for controlling the flow of oil under pressure during roll gap pulling. The oil return one-way throttle valve 8 consists of an oil return throttle valve and an oil return one-way valve, wherein the oil return throttle valve is connected with the oil return one-way valve in parallel, and the oil return one-way valve is closed along the oil return direction. The pressure oil one-way throttle valve 9 consists of a pressure oil throttle valve and a pressure oil one-way valve, wherein the pressure oil throttle valve is connected with the pressure oil one-way valve in parallel, and the pressure oil one-way valve is closed along the pressure oil direction. Namely the return oil check valve and the pressure oil check valve are opposite in direction. The oil return one-way throttle valve 8 is connected with the pressure oil one-way throttle valve 9 in series, the oil return one-way throttle valve 8 is arranged at one end close to the balance valve 7, and the pressure oil one-way throttle valve 9 is arranged at one end close to the three-position four-way electro-hydraulic reversing valve 10. Specifically, the return oil one-way throttle valve 8 regulates the flow of oil entering the return oil channel through the balance valve 7 and flowing back to the oil tank 4, the pressure oil one-way throttle valve 9 regulates the flow entering the rod cavity of the oil cylinder 3 through the three-position four-way electrohydraulic reversing valve 10 and the balance valve 7, the two valves are arranged in series to regulate and control the flow of the balance valve 7 together, the speed of piston movement in the oil cylinder 3 is limited, and the shaking phenomenon of the oil cylinder 3 can be effectively eliminated.
Example 3
A hydraulic control method of a roller press, as shown in fig. 1, comprises the following steps:
Normal working steps are as follows: the oil tank 4 supplies oil to the oil cylinder 3, so that the rod cavity of the oil cylinder 3 is filled with oil, air in the rod cavity is discharged, the third electromagnetic directional valve 6 is not electrified, the control oil X acts on the balance valve 7 and the hydraulic control one-way valve 11, the throttle valve working position of the balance valve 7 works, the hydraulic control one-way valve 11 is opened, the oil in the rod cavity returns to the oil tank 4 through the balance valve 7 and the hydraulic control one-way valve 11, and when the roll gap is enlarged, the oil tank 4 supplements the oil to the rod cavity of the oil cylinder 3;
an anti-impact step: under the condition that the rolling machine breaks materials or crushed aggregates, the balance valve 7 controls the pressure of an oil way to drop, the balance valve 7 is reversed to a check valve working position under the action of a spring, an oil return way is cut off, the impact of a roller is stopped, and when the pressure of the balance valve 7 controlling the oil way rises, the balance valve 7 is reversed to a throttle valve working position, and the rolling machine works normally.
Specifically, through the anti-impact step, impact and vibration generated by the roller under the condition of broken materials or crushed aggregates can be reduced, the main machine frame, the roller bearing and the energy accumulator 1 are protected, and the service life of the equipment is effectively prolonged.
Example 4
A hydraulic control method of a roller press, based on the embodiment 1, as shown in fig. 1, further comprises
And (3) roll seam pulling step: the third electromagnetic reversing valve 6 is electrified to cut off the main control oil way, the control oil X does not act on the balance valve 7 and the hydraulic control one-way valve 11 any more for control, the balance valve 7 is reversed to the one-way valve working position under the action of the spring, the hydraulic control one-way valve 11 is closed, the electromagnet a of the three-position four-way electro-hydraulic reversing valve 10 is electrified, and the pressure oil enters the rod cavity of the oil cylinder 3 through the third electromagnetic reversing valve 6 and the balance valve 7, so that the piston of the oil cylinder 3 is retracted and pulled to open the roll gap.
Specifically, the pressure oil can be rapidly fed into the rod cavity of the oil cylinder through the working position of the one-way valve, so that the efficiency of roller gap pulling is improved.
The principles and embodiments of the present invention have been described herein with reference to specific examples, which are intended to be merely illustrative of the methods of the present invention and their core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Claims (4)
1. The hydraulic control system of the roller press comprises a driving roller, a driven roller, an energy accumulator (1), an oil cylinder (3) and an oil pump (16), wherein the oil pump (16) is respectively connected with a rod cavity and a rodless cavity of the oil cylinder (3) through a first electromagnetic directional valve (15) to form a hydraulic control oil way, a second electromagnetic directional valve (12) is arranged between the first electromagnetic directional valve (15) and the rodless cavity, the energy accumulator (1) is arranged between the second electromagnetic directional valve (12) and the oil cylinder (3), and a three-position four-way electro-hydraulic directional valve (10) is arranged between the first electromagnetic directional valve (15) and the rodless cavity; the oil cylinder (3) comprises a transmission side oil cylinder and a non-transmission side oil cylinder, the transmission side and the non-transmission side are oppositely arranged at two ends of the driving roller, a piston of the transmission side oil cylinder is connected with and controls the transmission side of the driving roller, a piston of the non-transmission side oil cylinder is connected with and controls the non-transmission side of the driving roller, and the hydraulic control oil way regulates and controls the oil quantity in a rod cavity and a rodless cavity of the oil cylinder (3), so that the transmission side oil cylinder and the non-transmission side oil cylinder are mutually matched to control the width of a roller gap between the driving roller and the driven roller, and the oil cylinder is characterized in that: the rod cavity of the oil cylinder (3) is connected with two branches, one branch is communicated with the oil outlet of the oil tank (4) to form an oil inlet path, the other oil return path is formed by communicating an oil inlet of the oil tank (4) through a balance valve (7), and a control oil path of the balance valve (7) is communicated with a rodless cavity of the oil cylinder (3); when the width of the roll gap is narrowed, the pressure of the rodless cavity is reduced and acts on the balance valve (7), so that oil in the rod cavity does not flow out along the balance valve (7), the oil in the rod cavity keeps constant value and supports the piston of the oil cylinder (3), and the impact when the width of the roll gap is narrowed is reduced; the rod cavity of the transmission side oil cylinder is connected with the rod cavity of the non-transmission side oil cylinder in parallel to form a rod cavity oil way, the rod cavity oil way is connected with two branches, one branch is communicated with an oil outlet of the oil tank (4) to form an oil inlet path, the other branch is communicated with an oil inlet of the oil tank (4) through a balance valve (7) to form an oil return path, a control oil way of the balance valve (7) is communicated with the rod cavity oil way, control oil (X) acts on the balance valve (7) through a control oil way of the balance valve (7), and a throttle valve working position of the balance valve (7) works to enable oil in the rod cavity to enter the oil return path along the balance valve (7); a hydraulic control one-way valve (11) is arranged between the balance valve (7) and an oil inlet of the oil tank (4), a control oil way of the hydraulic control one-way valve (11) is communicated with a rodless cavity oil way, and control oil (X) acts on the hydraulic control one-way valve (11) through the control oil way of the hydraulic control one-way valve (11), and the hydraulic control one-way valve (11) is in an open state so that oil in a rod cavity returns to the oil tank (4); a pull roll branch is arranged between the balance valve (7) and the hydraulic control one-way valve (11), the three-position four-way electrohydraulic reversing valve (10) is arranged on the pull roll branch, and when a roll gap is pulled, pressure oil enters a rod cavity through the three-position four-way electrohydraulic reversing valve (10) and the balance valve (7) and pushes a piston to retract, so that the roll gap width is increased; the control oil way of the balance valve (7) is communicated with the control oil way of the hydraulic control one-way valve (11) to form a main control oil way, and a third electromagnetic reversing valve (6) is arranged on the main control oil way; when the third electromagnetic reversing valve (6) is powered on, the main control oil way is limited, so that the control oil (X) cannot act on the balance valve (7) and the hydraulic control one-way valve (11) along the main control oil way; a one-way throttle valve is arranged between the balance valve (7) and the pull roll branch, and the flow passing through the balance valve (7) is regulated; the one-way throttle valve comprises an oil return one-way throttle valve (8) and a pressure oil one-way throttle valve (9), the oil return one-way throttle valve (8) is connected with the pressure oil one-way throttle valve (9) in series, the oil return one-way throttle valve (8) is arranged at one end close to the balance valve (7), and the pressure oil one-way throttle valve (9) is arranged at one end close to the three-position four-way electrohydraulic reversing valve (10).
2. The roll squeezer hydraulic control system as set forth in claim 1 wherein: the oil outlet of the oil tank (4) is provided with a liquid filling valve (5) for preventing oil from flowing back to the oil tank (4) along the oil outlet.
3. A hydraulic control method for a roll squeezer, applied to the hydraulic control system for a roll squeezer as claimed in claim 1 or 2, comprising the steps of:
Normal working steps are as follows: the oil tank (4) supplies oil to the oil cylinder (3), so that oil is filled in a rod cavity of the oil cylinder (3), air in the rod cavity is discharged, the third electromagnetic directional valve (6) is not electrified, the control oil (X) acts on the balance valve (7) and the hydraulic control one-way valve (11), the throttle valve working position of the balance valve (7) works, the hydraulic control one-way valve (11) is opened, the oil in the rod cavity returns to the oil tank (4) through the balance valve (7) and the hydraulic control one-way valve (11), and when the roll gap is enlarged, the oil tank (4) supplements the oil to the rod cavity of the oil cylinder (3);
An anti-impact step: under the condition that the rolling machine breaks materials or crushed aggregates, the balance valve (7) controls the pressure of an oil way to drop, the balance valve (7) is reversed to a check valve working position under the action of a spring, an oil return way is cut off, the impact of a roller is stopped, and when the pressure of the oil way controlled by the balance valve (7) rises, the balance valve (7) is reversed to a throttle valve working position, and the rolling machine works normally.
4. The roll squeezer hydraulic control method as claimed in claim 3, wherein: and also comprises
And (3) roll seam pulling step: the third electromagnetic reversing valve (6) is electrified to cut off the main control oil way, control oil (X) does not act on the balance valve (7) and the hydraulic control one-way valve (11) any more for control, the balance valve (7) is reversed to the working position of the one-way valve under the action of a spring, the hydraulic control one-way valve (11) is closed, the electromagnet a of the three-position four-way electro-hydraulic reversing valve (10) is electrified, pressure oil enters a rod cavity of the oil cylinder (3) through the third electromagnetic reversing valve (6) and the balance valve (7), and the piston of the oil cylinder (3) is retracted to pull open a roll gap.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05212414A (en) * | 1992-02-04 | 1993-08-24 | Sumitomo Metal Ind Ltd | Method for controlling prevention of slab buckling and hydraulic circuit used therefor |
| CN102583172A (en) * | 2011-12-19 | 2012-07-18 | 徐州重型机械有限公司 | Suspension arm telescopic hydraulic control system and crane with same |
| CN103447317A (en) * | 2013-09-05 | 2013-12-18 | 太原重工股份有限公司 | Hydraulic control system for upper roll balancing device of rotary forging mill |
| CN104088823A (en) * | 2014-06-30 | 2014-10-08 | 洛阳天信重工机械有限公司 | Four-roller breaker hydraulic control system |
| CN107882823A (en) * | 2016-09-30 | 2018-04-06 | 南京梅山冶金发展有限公司 | Overcome the hydraulic control system of the harmful concussion of four-roller crusher oil cylinder |
| CN212774978U (en) * | 2020-09-19 | 2021-03-23 | 北京首钢国际工程技术有限公司 | Hydraulic control valve table for auxiliary clamping roller of rolling mill under large press of continuous casting billet |
| CN217080939U (en) * | 2021-06-25 | 2022-07-29 | 成都利君实业股份有限公司 | Hydraulic control equipment of roller press |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA3012374A1 (en) * | 2017-03-21 | 2018-09-21 | Jiangsu University | Self-adaptive control system for feeding mouth opening of round bale bundling machine and controlling method thereof |
-
2021
- 2021-06-25 CN CN202110712201.4A patent/CN113266616B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05212414A (en) * | 1992-02-04 | 1993-08-24 | Sumitomo Metal Ind Ltd | Method for controlling prevention of slab buckling and hydraulic circuit used therefor |
| CN102583172A (en) * | 2011-12-19 | 2012-07-18 | 徐州重型机械有限公司 | Suspension arm telescopic hydraulic control system and crane with same |
| CN103447317A (en) * | 2013-09-05 | 2013-12-18 | 太原重工股份有限公司 | Hydraulic control system for upper roll balancing device of rotary forging mill |
| CN104088823A (en) * | 2014-06-30 | 2014-10-08 | 洛阳天信重工机械有限公司 | Four-roller breaker hydraulic control system |
| CN107882823A (en) * | 2016-09-30 | 2018-04-06 | 南京梅山冶金发展有限公司 | Overcome the hydraulic control system of the harmful concussion of four-roller crusher oil cylinder |
| CN212774978U (en) * | 2020-09-19 | 2021-03-23 | 北京首钢国际工程技术有限公司 | Hydraulic control valve table for auxiliary clamping roller of rolling mill under large press of continuous casting billet |
| CN217080939U (en) * | 2021-06-25 | 2022-07-29 | 成都利君实业股份有限公司 | Hydraulic control equipment of roller press |
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