CN113266616A - Hydraulic control system and method for roller press - Google Patents
Hydraulic control system and method for roller press Download PDFInfo
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- CN113266616A CN113266616A CN202110712201.4A CN202110712201A CN113266616A CN 113266616 A CN113266616 A CN 113266616A CN 202110712201 A CN202110712201 A CN 202110712201A CN 113266616 A CN113266616 A CN 113266616A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims description 62
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- 239000007788 liquid Substances 0.000 claims description 5
- 230000002265 prevention Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 13
- 230000002035 prolonged effect Effects 0.000 abstract description 7
- 239000004566 building material Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 391
- 230000000694 effects Effects 0.000 description 7
- 230000009467 reduction Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 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
- 239000010724 circulating oil Substances 0.000 description 1
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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
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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
- 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
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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
- F15B21/008—Reduction of noise or vibration
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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
- 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
Abstract
The invention discloses a hydraulic control system and method for a roller press, and relates to a hydraulic control system and method for a roller press and a high-pressure roller mill in building material and mine industries. According to the hydraulic control system and method for the roller press, the oil tank connected with the rod cavity of the oil cylinder is matched with the balance valve, the balance valve can be controlled in time when the roller press breaks or crushes materials, oil is limited in the rod cavity and supports the piston of the oil cylinder, 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 suitable for a roller press and a high-pressure roller mill in the building material and mine industries.
Background
The roller press (also known as a high-pressure roller mill) consists of two extrusion rollers which rotate synchronously in opposite directions, one is a fixed roller, the other is a movable roller, and materials are extruded and crushed by the pressure between the two rollers through a gap between the fixed roller and the movable roller of the roller press. Under normal operating conditions, the roll gap width between two rollers is certain, if the circumstances such as the incoming material inequality, disconnected material appear, has lacked the support of material between two rollers, under hydraulic system's effect, the roll gap can sharply reduce, leads to the roller shake and produces great impact, produces great influence to roll squeezer self, like host computer frame, roller bearing, hydraulic system etc. reduce roll squeezer's life.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the invention provides a hydraulic control system and a hydraulic control method for a roller press, wherein an oil tank connected with a rod cavity of an oil cylinder is matched with a balance valve, the balance valve can be controlled in time when the roller press breaks or crushes materials, oil is limited in the rod cavity and supports a piston of the oil cylinder, 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:
a hydraulic control system of a 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 directional valve to form a hydraulic control oil path; the hydro-cylinder includes transmission side hydro-cylinder and non-transmission side hydro-cylinder, drive roll and driven voller set up in the both ends of drive roll relatively, the transmission side of the piston connection of transmission side hydro-cylinder and control drive roll, the non-transmission side of the piston connection of non-transmission side hydro-cylinder and control drive roll, the oil mass in hydraulic control oil circuit regulation and control hydro-cylinder has pole chamber and no pole chamber, and then makes transmission side hydro-cylinder and non-transmission side hydro-cylinder mutually support the roll gap width between control drive roll and the driven voller, its characterized in that: the rod cavity of the oil cylinder 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, and a control oil path 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 oil in the rod cavity does not flow out along the balance valve any more, the oil in the rod cavity keeps a 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 roller press breaks or crushes materials, larger impact can be generated, at the moment, the piston in the oil cylinder extends out, the pressure in the rodless cavity is reduced, the pressure of the balance valve control oil path communicated with the rodless cavity is reduced, the balance valve is reversed to the working position of the one-way valve under the action of the spring, so that the oil in the rod cavity does not flow to the oil return path along the balance valve, the oil in the rod cavity keeps a constant value and supports the piston of the oil cylinder, 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 run stably, a main frame, a roll bearing and an energy accumulator are protected, and the service life of the equipment is effectively prolonged.
Furthermore, a rod cavity of the oil cylinder at the transmission side is connected with a rod cavity of the oil cylinder at the non-transmission side in parallel to form a rod cavity oil circuit, a rodless cavity of the oil cylinder at the transmission side is connected with a rodless cavity of the oil cylinder at the non-transmission side in parallel to form a rodless cavity oil circuit, the rod cavity oil circuit is connected with two branch circuits, one branch circuit is communicated with an oil outlet of the oil tank to form an oil inlet circuit, the other branch circuit is communicated with an oil inlet of the oil tank through a balance valve to form an oil return circuit, a control oil circuit of the balance valve is communicated with the rodless cavity oil circuit, control oil acts on the balance valve through the control oil circuit of the balance valve, and a throttle valve of the balance valve works at a working position to enable the oil in the rod cavity to enter the oil return circuit along the balance valve.
By adopting the technical scheme, the synchronous control of the transmission side oil cylinder and the non-transmission side oil cylinder can be realized, the hydraulic control system is simplified, the pressure difference of the rodless cavities of the transmission side oil cylinder and the non-transmission side oil cylinder is reduced together when the roller press breaks or crushes materials, and the effect of pressure reduction is superposed due to the parallel arrangement, so that the response speed of the balance valve can be improved.
Furthermore, a hydraulic control one-way valve is arranged between the balance valve and the oil inlet of the oil tank, a control oil path of the hydraulic control one-way valve is communicated with the oil path of the rodless cavity, control oil acts on the hydraulic control one-way valve through the control oil path 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 normally works, the control oil acts on the hydraulic control one-way valve through the control oil path of the hydraulic control one-way valve, the hydraulic control one-way valve is opened, at the moment, the oil in the rod cavity returns to the oil tank through the balance valve and the hydraulic control one-way valve, a circulating oil path is formed among the oil tank, the balance valve and the hydraulic control one-way valve, and the oil is not required to be supplemented into the oil tank in the normal use process.
Furthermore, a pull roll branch is arranged between the balance valve and the hydraulic control one-way valve, the three-position four-way electro-hydraulic reversing valve is arranged on the pull roll branch, and when a roll gap is pulled, pressure oil enters the rod cavity through the three-position four-way electro-hydraulic reversing valve and the balance valve and pushes the piston to retract, so that the width of the roll gap is increased.
By adopting the technical scheme, pressure oil can be injected into a rod cavity of the oil cylinder when the roll gap needs to be pulled open by switching the three-position four-way electro-hydraulic reversing valve, and the piston of the oil cylinder retracts to pull open the roll gap.
Furthermore, a control oil path of the balance valve is communicated with a control oil path of the hydraulic control one-way valve to form a main control oil path, and a third electromagnetic directional valve is arranged on the main control oil path; when the third electromagnetic directional valve is electrified, 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.
By adopting the technical scheme, when the roller press normally works, the third electromagnetic reversing valve is not electrified, control oil acts on the balance valve and the hydraulic control one-way valve, the throttle valve in the balance valve works at the working position 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 reversing valve is electrified, 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 any more, 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 pressure oil cannot flow into the oil tank and can only rapidly enter the rod cavity of the oil cylinder through the working position of the one-way valve, and the piston of the oil cylinder retracts to pull the roll gap.
Furthermore, a one-way throttle valve is arranged between the balance valve and the pull roll branch to adjust the flow passing through the balance valve.
By adopting the technical scheme, the flow passing through the balance valve can be adjusted 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, one-way throttle valve includes oil return one-way throttle valve and pressure oil one-way throttle valve, oil return one-way throttle valve and pressure oil one-way throttle valve establish ties, oil return one-way throttle valve locates the one end that is close to the balanced valve, pressure oil one-way throttle valve locates the one end that is close to three-position four-way electro-hydraulic directional control valve.
By adopting the technical scheme, the oil return one-way throttle valve adjusts the flow of oil which enters an oil return circuit through the balance valve and flows back to the oil tank, the pressure oil one-way throttle valve adjusts the flow of oil which enters a rod cavity of the oil cylinder through the three-position four-way electro-hydraulic reversing valve and the balance valve, the three-position four-way electro-hydraulic reversing valve and the balance valve are connected in series to jointly adjust and control the flow of the balance valve, the movement speed of a piston in the oil cylinder is limited, and the shaking phenomenon of the oil cylinder can be effectively eliminated.
Furthermore, a liquid filling valve is arranged at the oil outlet of the oil tank and prevents oil from flowing back to the oil tank along the oil outlet.
By adopting the technical scheme, when the working position of the one-way valve of the balance valve works, oil in the rod cavity can not pass through the balance valve, and can flow back to the oil tank along the oil outlet of the oil tank under the action of pressure, so that the effect of supporting the piston of the oil cylinder can not be 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 a rod cavity of the oil cylinder is filled with oil, air in the rod cavity is discharged, the electromagnetic directional valve is not electrified, control oil acts on the balance valve and the hydraulic control one-way valve, a throttle valve of the balance valve works at a working position, 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 a roll gap is enlarged, the oil tank supplies oil to the rod cavity of the oil cylinder;
an impact prevention step: when the roller press is broken or crushed, the pressure of the oil path controlled by the balance valve is reduced, the balance valve is reversed to the working position of the one-way valve under the action of the spring, the oil return path is cut off, the impact of the roller is stopped, and when the pressure of the oil path controlled by the balance valve is increased, the balance valve is reversed to the working position of the throttle valve, and the roller press works normally.
By adopting the technical scheme, through the impact-proof step, the impact and the vibration generated by the roller under the condition of material breakage or material crushing can be reduced, the main frame, the roller bearing and the energy accumulator are protected, and the service life of the equipment is effectively prolonged.
Further, also includes
And (3) roll gap drawing step: the electromagnetic directional 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 to control, 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 electro-hydraulic directional valve is electrified, the pressure oil enters the rod cavity of the oil cylinder through the electromagnetic directional valve and the balance valve, and the piston of the oil cylinder retracts to pull open the roll gap.
By adopting the technical scheme, pressure oil can be quickly fed into the rod cavity of the oil cylinder through the working position of the one-way valve, so that the efficiency of drawing a roll gap is improved.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the balance valve can timely support the oil cylinder when the roller press breaks or crushes materials, so that the roller can run stably, the generated impact and the vibration of the equipment are reduced, the main machine frame, the roller bearing and the energy accumulator are protected, and the service life of the equipment is effectively prolonged.
2. The invention does not need to supplement oil to the oil tank.
3. The invention can quickly inject pressure oil into the rod cavity of the oil cylinder when the roll gap needs to be pulled open, and the piston of the oil cylinder retracts to pull open the roll gap.
4. The invention can adjust the flow passing through the balance valve, limit the movement speed of the piston 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 impact of larger impact force formed by overlarge pressure oil 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 roller press according to the present invention.
The labels in the figure are: 1-an energy accumulator, 2-a first throttle valve, 3-an oil cylinder, 4-an oil tank, 5-a liquid charging valve, 6-a third electromagnetic directional valve, 7-a balance valve, 8-an oil return one-way throttle valve, 9-a pressure oil one-way throttle valve, 10-a three-position four-way electro-hydraulic directional valve, 11-a hydraulic control one-way valve, 12-a second electromagnetic directional valve, 13-a one-way valve, 14-a second throttle valve, 15-a first electromagnetic directional valve, 16-an oil pump and X-control oil.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A hydraulic control system of a roller press is shown in figure 1 and comprises a driving roller, a driven roller, an energy accumulator 1, an oil cylinder 3 and an oil pump 16, the oil pump 16 is respectively connected with the rod cavity and the rodless cavity of the oil cylinder 3 through the first electromagnetic directional valve 15, the second throttle valve 14 and the 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 the 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, an energy accumulator 1 is arranged between the second electromagnetic directional valve 12 and the oil cylinder 3, a first throttling valve 2 is arranged between the energy accumulator 1 and the oil cylinder 3, and the first throttling 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 electrified, and the 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. And a 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, an 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 throttle valve 14, the check 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 path regulates and controls the oil amount 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 roll gap between the driving roller and a 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 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, and a control oil path 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 oil in the rod cavity does not flow out 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, and the impact when the width of the roll gap is narrowed is reduced. Specifically, when the roller press breaks or scraps, large impact can be generated, at the moment, a piston in an oil cylinder 3 extends out, the pressure in a rodless cavity is reduced, the pressure of a balance valve 7 which is communicated with the rodless cavity is reduced along with the reduction of the pressure of a control oil path, the balance valve 7 is reversed to a one-way valve working position under the action of a spring, so that oil in a 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 run stably, a main frame, a roll bearing and an energy accumulator are protected, and the service life of the equipment is effectively prolonged.
The oil cylinder comprises a rod cavity of a transmission side oil cylinder and a rod cavity of a non-transmission side oil cylinder, wherein the rod cavity of the transmission side oil cylinder is connected in parallel to form a rod cavity oil circuit, the rodless cavity of the transmission side oil cylinder is connected in parallel to form a rodless cavity oil circuit, the rod cavity oil circuit is connected with two branches, one branch is communicated with an oil outlet of an oil tank 4 to form an oil inlet circuit, the other branch is communicated with an oil inlet of the oil tank 4 through a balance valve 7 to form an oil return circuit, a control oil circuit of the balance valve 7 is communicated with the rodless cavity oil circuit, a control oil X acts on the balance valve 7 through the control oil circuit of the balance valve 7, and a throttling valve of the balance valve 7 works at a working position, so that oil. Specifically, the synchronous control of the transmission side oil cylinder and the non-transmission side oil cylinder can be realized, the hydraulic control system is simplified, the pressure difference of the rodless cavities of the transmission side oil cylinder and the non-transmission side oil cylinder is reduced together when the roller press breaks or crushes materials, the effect of pressure reduction is superposed due to the parallel arrangement, and 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 path of the hydraulic control one-way valve 11 is communicated with a rodless cavity oil path, control oil X acts on the hydraulic control one-way valve 11 through the control oil path of the hydraulic control one-way valve 11, and the hydraulic control one-way valve 11 is in an opening state, so that the oil in the rod cavity returns to the oil tank 4. Specifically, when the roller press normally operates, the control oil X acts on the pilot check valve 11 through the corresponding control oil path, and opens the pilot check valve 11, at this time, the oil in the rod cavity returns to the oil tank 4 through the balance valve 7 and the pilot check valve 11, a circulation oil path is formed among the oil tank 4, the balance valve 7 and the pilot check valve 11, and oil does not need to be replenished into the oil tank 4 in the normal use process.
Be equipped with one-way throttle valve between balanced valve 7 and the pull roll branch road, adjust the flow through balanced valve, one-way throttle valve includes return oil one-way throttle valve 8. Specifically, the oil flow entering an oil return circuit through the balance valve and flowing back to the oil tank 5 is regulated through the oil return one-way throttle valve 8, the movement speed of a piston in the oil cylinder 3 is limited, and the shaking phenomenon of the oil cylinder 3 can be effectively eliminated.
And a liquid filling valve 5 is arranged at the oil outlet of the oil tank 4, and the liquid filling valve 5 prevents oil from flowing back to the oil tank 4 along the oil outlet. Specifically speaking, when the check valve work position of balanced valve 7 during operation, have the oil in the pole intracavity can't pass through balanced valve 7, under the effect of pressure, oil can be along the oil-out refluence oil return tank 4 of oil tank 4, can't play the effect of 3 pistons of support cylinder, the event sets up prefill valve 5, avoids oil to flow back oil return tank along the oil-out refluence of oil tank 4, ensures that the oil mass that has the pole intracavity is a definite value when the check valve work position of balanced valve 7 during operation, plays the effect of 3 pistons of support cylinder.
Example 2
A hydraulic control system of a roller press is shown in figure 1 and 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 path, 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 path regulates and controls the oil amount 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 roll gap between the driving roller and a 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 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, and a control oil path 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 oil in the rod cavity does not flow out 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, and the impact when the width of the roll gap is narrowed is reduced.
The oil cylinder comprises a rod cavity of a transmission side oil cylinder and a rod cavity of a non-transmission side oil cylinder, wherein the rod cavity of the transmission side oil cylinder is connected in parallel to form a rod cavity oil circuit, the rodless cavity of the transmission side oil cylinder is connected in parallel to form a rodless cavity oil circuit, the rod cavity oil circuit is connected with two branches, one branch is communicated with an oil outlet of an oil tank 4 to form an oil inlet circuit, the other branch is communicated with an oil inlet of the oil tank 4 through a balance valve 7 to form an oil return circuit, a control oil circuit of the balance valve 7 is communicated with the rodless cavity oil circuit, a control oil X acts on the balance valve 7 through the control oil circuit of the balance valve 7, and a throttling valve of the balance valve 7 works at a working position, so that oil in the rod cavity enters the oil return circuit 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 path of the hydraulic control one-way valve 11 is communicated with a rodless cavity oil path, control oil X acts on the hydraulic control one-way valve 11 through the control oil path of the hydraulic control one-way valve 11, and the hydraulic control one-way valve 11 is in an opening state, so that the oil in the 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 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, pressure oil enters the rod cavity through the three-position four-way electro-hydraulic reversing valve 10 and the balance valve 7 and pushes the piston to retract, and the width of the roll gap is increased. Specifically, by switching the three-position four-way electro-hydraulic reversing valve 10, pressure oil can be injected into a rod cavity of the oil cylinder 3 when a roll gap needs to be pulled open, a piston of the oil cylinder 3 retracts to pull open the roll gap, and when the roll squeezer normally works, the three-position four-way electro-hydraulic reversing valve 10 is located at the middle position, and 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 directional valve 6 is arranged on the main control oil way; when the third electromagnetic directional valve 6 is powered on, the main control oil path 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 path. Specifically, when the roller press normally works, 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 in the balance valve 7 works at the working position and is in an open state, and the oil with the rod cavity 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 squeezer pulls a roll gap, the third electromagnetic directional valve 6 is electrified to cut off a 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, the balance valve 7 is reversed to the working position of the one-way valve 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 can only rapidly enter the rod cavity of the oil cylinder 3 through the working position of the one-way valve, and the piston of the oil cylinder 3 retracts to pull the roll gap.
Be equipped with one-way throttle valve behind the balanced valve 7, one-way throttle valve includes along balanced valve 7 the oil return one-way throttle valve 8 of the flow of the oil of backward flow to oil tank 4 to and the pressure oil one-way throttle valve 9 of control pressure oil flow when the draw roll seam. The oil return one-way throttle valve 8 is composed of an oil return throttle valve and an oil return one-way valve, 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 is composed of a pressure oil throttle valve and a pressure oil one-way valve, the pressure oil throttle valve and the pressure oil one-way valve are connected in parallel, and the pressure oil one-way valve is closed along the pressure oil direction. Namely, the direction of the oil return check valve is opposite to that of the pressure oil check valve. 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 oil return one-way throttle valve 8 adjusts the flow of oil which enters an oil return circuit through the balance valve 7 and flows back to the oil tank 4, the pressure oil one-way throttle valve 9 adjusts the flow which enters a rod cavity of the oil cylinder 3 through the three-position four-way electro-hydraulic reversing valve 10 and the balance valve 7, the two are connected in series to jointly adjust and control the flow of the balance valve 7, the movement speed of a piston 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 for a roller press, as shown in fig. 1, includes the following steps:
normal working steps are as follows: the oil tank 4 supplies oil to the oil cylinder 3, so that a 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 of the balance valve 7 works at a working position, 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 supplies oil to the rod cavity of the oil cylinder 3;
an impact prevention step: when the roller press breaks or crushes, the pressure of the oil path is controlled to be reduced by the balance valve 7, the balance valve 7 is reversed to the working position of the one-way valve under the action of the spring, an oil return path is cut off, the impact of the roller is stopped, and when the pressure of the oil path is controlled to be increased by the balance valve 7, the balance valve 7 is reversed to the working position of the throttle valve, and the roller press works normally.
Specifically, through the anti-impact step, impact and vibration generated by the rollers under the condition of material breaking or material crushing can be reduced, the main frame, the roller bearings and the energy accumulator 1 are protected, and the service life of the equipment is effectively prolonged.
Example 4
On the basis of embodiment 1, as shown in fig. 1, a hydraulic control method for a roller press further comprises
And (3) roll gap drawing step: the third electromagnetic directional 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 longer, the balance valve 7 is switched to the working position of the one-way valve 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 directional valve 10 is electrified, pressure oil enters the rod cavity of the oil cylinder 3 through the third electromagnetic directional valve 6 and the balance valve 7, and the piston of the oil cylinder 3 retracts to pull open a roll gap.
Specifically, pressure oil can be quickly fed into a rod cavity of the oil cylinder through a working position of the one-way valve, and the efficiency of drawing a roll gap is improved.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to aid in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, 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 otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (10)
1. A hydraulic control system of a 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 path, 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; hydro-cylinder (3) are including transmission side hydro-cylinder and non-transmission side hydro-cylinder, transmission side and non-transmission side set up in the both ends of drive roll relatively, the transmission side of the piston connection of transmission side hydro-cylinder and control drive roll, the non-transmission side of the piston connection of non-transmission side hydro-cylinder and control drive roll, hydraulic control oil circuit regulation and control hydro-cylinder (3) have the oil mass in pole chamber and no pole chamber, and then make transmission side hydro-cylinder and non-transmission side hydro-cylinder mutually support the roll gap width between control drive roll and the driven voller, its characterized in that: a 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 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, 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 can not flow out along the balance valve (7), the oil in the rod cavity keeps a constant value and supports a piston of the oil cylinder (3), and the impact when the width of the roll gap is narrowed is reduced.
2. The hydraulic control system of a roller press according to claim 1, characterized in that: the oil cylinder comprises a rod cavity of a transmission side oil cylinder and a rod cavity of a non-transmission side oil cylinder, wherein the rod cavity of the transmission side oil cylinder and the rod cavity of the non-transmission side oil cylinder are connected in parallel to form a rod cavity oil circuit, the rod cavity oil circuit is connected with two branch circuits, one branch circuit is communicated with an oil outlet of an oil tank (4) to form an oil inlet circuit, the other branch circuit is communicated with an oil inlet of the oil tank (4) through a balance valve (7) to form an oil return circuit, a control oil circuit of the balance valve (7) is communicated with the rod cavity oil circuit, control oil (X) acts on the balance valve (7) through the control oil circuit of the balance valve (7), and a throttling valve work position of the balance valve (7) works to enable oil in the rod cavity to enter the oil return circuit along the balance valve (.
3. The hydraulic control system of a roller press according to claim 2, characterized in that: 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), and the hydraulic control one-way valve (11) is in an opening state to enable oil in the rod cavity to return to the oil tank (4).
4. The hydraulic control system of a roller press according to claim 3, characterized in that: 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, and when a roll gap is pulled, pressure oil enters the rod cavity through the three-position four-way electro-hydraulic reversing valve (10) and the balance valve (7) and pushes the piston to retract, so that the width of the roll gap is increased.
5. The hydraulic control system of a roller press according to claim 4, wherein: 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 directional valve (6) is arranged on the main control oil way; when the third electromagnetic directional valve (6) is electrified, 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.
6. The hydraulic control system of a roller press according to claim 4, wherein: and a one-way throttle valve is arranged between the balance valve (7) and the pull roll branch to regulate the flow passing through the balance valve (7).
7. The hydraulic control system of the roller press according to claim 6, wherein 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 in series with the pressure oil one-way throttle valve (9), 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).
8. The hydraulic control system of a roller press according to claim 1, characterized in that: and a liquid filling valve (5) is arranged at the oil outlet of the oil tank (4) to prevent oil from flowing back to the oil tank (4) along the oil outlet.
9. A hydraulic control method for a roller press is characterized by comprising the following steps:
normal working steps are as follows: the oil tank (4) supplies oil to the oil cylinder (3), so that a 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, control oil (X) acts on the balance valve (7) and the hydraulic control one-way valve (11), a throttle valve of the balance valve (7) works at a working position, 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) supplies oil to the rod cavity of the oil cylinder (3);
an impact prevention step: when the roller press breaks or crushes, the pressure of the oil path is controlled to be reduced by the balance valve (7), the balance valve (7) is reversed to the working position of the one-way valve under the action of the spring, an oil return path is cut off, the impact of the roller is stopped, and when the pressure of the oil path is controlled to be increased by the balance valve (7), the balance valve (7) is reversed to the working position of the throttle valve, and the roller press works normally.
10. The hydraulic control method of a roller press according to claim 9, characterized in that: also comprises
And (3) roll gap drawing step: the third electromagnetic directional 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, the balance valve (7) is reversed to the working position of the one-way valve 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 directional valve (10) is electrified, pressure oil enters the rod cavity of the oil cylinder (3) through the third electromagnetic directional 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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| CN202110712201.4A CN113266616A (en) | 2021-06-25 | 2021-06-25 | Hydraulic control system and method for roller press |
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| CN202110712201.4A CN113266616A (en) | 2021-06-25 | 2021-06-25 | Hydraulic control system and method for roller press |
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| US20190239438A1 (en) * | 2017-03-21 | 2019-08-08 | Jiangsu University | Self-adaptive control system for feed opening degree of round baler, and control method therefor |
| 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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|---|---|---|---|---|
| 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 |
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