CN113251029A - Hydraulic control system and method for adjusting roller press - Google Patents
Hydraulic control system and method for adjusting roller press Download PDFInfo
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- CN113251029A CN113251029A CN202110713865.2A CN202110713865A CN113251029A CN 113251029 A CN113251029 A CN 113251029A CN 202110713865 A CN202110713865 A CN 202110713865A CN 113251029 A CN113251029 A CN 113251029A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 202
- 238000006073 displacement reaction Methods 0.000 claims description 23
- 238000001125 extrusion Methods 0.000 abstract description 8
- 230000002035 prolonged effect Effects 0.000 abstract description 6
- 230000001276 controlling effect Effects 0.000 description 16
- 239000000463 material Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000010586 diagram Methods 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor
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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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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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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- 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/08—Assemblies of units, each for the control of a single servomotor only
- F15B13/0803—Modular units
- F15B13/0846—Electrical details
- F15B13/085—Electrical controllers
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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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/08—Assemblies of units, each for the control of a single servomotor only
- F15B13/0803—Modular units
- F15B13/0846—Electrical details
- F15B13/086—Sensing means, e.g. pressure sensors
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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
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
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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
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6306—Electronic controllers using input signals representing a pressure
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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
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6656—Closed loop control, i.e. control using feedback
Abstract
The invention discloses a hydraulic control system and a hydraulic control method for adjusting a roller press, which relate to the field of hydraulic pressure, and are characterized in that a working state of the roller press is monitored in real time through a data acquisition unit, once the inclination of a roll gap between two extrusion rolls is monitored, a control unit can control an oil pump to convey oil to a rod cavity of an oil cylinder at a transmission side, the pressure P1 of a hydraulic control oil way at the transmission side is increased, and the roll gap width b1 at the transmission side is increased, so that the roller press is ensured to always work under the state of constant pressure and constant roll gap, the roller press can be stably produced, a bearing and the hydraulic control oil way are protected, and the service life of the roller press can be effectively 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 adjusting 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. When the roller press works, in order to ensure that the extrusion force on materials is not reduced, a rod cavity of a cylinder of the roller press is required to be connected with an oil tank, oil in the rod cavity is discharged into the oil tank, the rod cavity is basically pressureless, a piston in the oil cylinder extends out of the oil cylinder by means of driving of an energy accumulator, the materials pass through a roller gap, and a roller is extruded to enable the piston to retract into the oil cylinder. When the supplied materials are not uniform or broken in production, the roll gap widths of the transmission side and the non-transmission side of the extrusion roll are different, and the pressure difference is large. As can be seen from fig. 1, b1 is smaller than b2(b2 is the roll gap width of the non-transmission side, b1 is the roll gap width of the transmission side), the incoming material of the transmission side is small, the roll gap change is small, and the rising amplitude of P1(P1 is the pressure of the rodless cavity of the oil cylinder on the transmission side) is small; the material coming from the non-transmission side is large, the roll gap change is large, and the rising amplitude of P2(P2 is the pressure of the rodless cavity of the oil cylinder on the non-transmission side) is large. At this moment, the difference between b1 and b2 becomes large, and in the past, the two extrusion rollers rotate to extrude materials under the condition that the axes are not parallel, so that the bearing stress is uneven, the service life of the roller press is influenced, and the production cost is increased.
In the whole production process, the rod cavity is always free of oil and pressure, and only when the roll gap is pulled, oil can enter the rod cavity to pull the roll gap open. When the roller press normally works, two methods are used for adjusting the roller gap, as shown in fig. 1, firstly, the P2 is increased through the hydraulic control system, so that the roller gap width b2 on the non-transmission side is reduced, but the P2 is already larger than the P1 when the roller gap inclines, and then the increase of the P2 makes the pressure difference between the P2 and the P1 larger, and the excessive pressure difference can cause damage to the hydraulic control system and is not allowed in actual production; secondly, the P1 is reduced through a hydraulic control system, the roll gap width b1 on the transmission side is increased under the extrusion of materials, and the method also enables the pressure difference between P2 and P1 to be increased. Therefore, the pressure is basically equal (P1 and P2) while the constant roll gap (b1 and b2) cannot be achieved by the existing method.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the invention provides a hydraulic control system for adjusting a roller press, which monitors the working state of the roller press in real time through a data acquisition unit, once the inclination of the roll gap between two squeeze rolls is monitored, a control unit can control an oil pump to convey oil to a rod cavity of an oil cylinder at a transmission side, the pressure P1 of a hydraulic control oil way at the transmission side is increased, and the width b1 of the roll gap at the transmission side is increased, so that the roller press is ensured to work under the state of constant pressure and constant roll gap all the time, the roller press can be stably produced, a bearing and the hydraulic control oil way are protected, and the service life of the roller press can be effectively prolonged.
The technical scheme adopted by the invention is as follows:
a hydraulic control system for adjusting a roller press comprises an energy accumulator, an oil cylinder, an oil pump and a squeeze roller, wherein the oil pump is connected with a rod cavity of the oil cylinder to form a control oil path and is connected with a rodless cavity of the oil cylinder to form an adjusting oil path; the hydraulic control oil way for controlling the oil cylinder at the transmission side of the squeeze roller is a hydraulic control oil way at the transmission side, the hydraulic control oil way for controlling the oil cylinder at the non-transmission side of the squeeze roller is a hydraulic control oil way at the non-transmission side, the hydraulic control oil way further comprises a data acquisition unit, a data processing unit and a control unit, the data acquisition unit is in signal connection with the data processing unit, the data processing unit is in signal connection with the control unit, and the second electromagnetic directional valve is in signal connection and controlled by the control unit; the data acquisition unit acquires operation data of a transmission side and a non-transmission side of the squeeze roller, the data processing unit judges whether the squeeze roller needs to be adjusted according to the data acquired by the data acquisition unit, and the control unit controls a second electromagnetic directional valve and an oil pump of a hydraulic control oil way at the transmission side according to the judgment result of the data processing unit; when the second electromagnetic directional valve of the hydraulic control oil path at the transmission side is electrified, the oil pump is communicated with the rod cavity of the oil cylinder through the second electromagnetic directional valve and conveys oil to the rod cavity, and the pressure and the roll gap width at the transmission side of the squeeze roll are adjusted.
By adopting the technical scheme, the working state of the roller press is monitored in real time through the data acquisition unit, once the roll gap between the two squeeze rolls is monitored to incline, the control unit can send control signals to the second electromagnetic directional valve and the oil pump of the hydraulic control oil way at the transmission side, the second electromagnetic directional valve is electrified, the oil pump is communicated with the rod cavity of the oil cylinder, the oil pump works to convey oil to the rod cavity, the pressure P1 of the hydraulic control oil way at the transmission side is increased, the roll gap width b1 at the transmission side is increased, finally, the pressure at the transmission side and the pressure at the non-transmission side can be basically equal while the roll gap width at the transmission side and the non-transmission side of the roller press is basically equal, the roller press can be stably produced, the bearing and the hydraulic control oil way are protected, and the service life of the roller press can be effectively prolonged.
And furthermore, a pressure relief oil path is arranged on the adjusting oil path, one end of the pressure relief oil path is connected with the rod cavity of the oil cylinder through a second electromagnetic directional valve, the other end of the pressure relief oil path is connected with the oil tank, and when the second electromagnetic directional valve is not electrified, oil in the rod cavity flows back to the oil tank along the pressure relief oil path through the second electromagnetic directional valve.
By adopting the technical scheme, after the oil in the rod cavity is used for adjusting the roll gap, the second electromagnetic directional valve is not electrified under the control of the control unit, the pressure relief oil path is communicated with the rod cavity of the oil cylinder through the second electromagnetic directional valve, the oil in the rod cavity flows back to the oil tank through the self-discharging oil path, the pressure relief of the rod cavity is completed, and the roll squeezer returns to the normal working state.
Furthermore, an overflow oil return path is arranged between the second electromagnetic directional valve and a rod cavity of the oil cylinder, the overflow oil return path is connected with the oil tank through an overflow valve, the overflow valve is opened after the pressure of the rod cavity reaches a threshold value, and the oil in the rod cavity flows back to the oil tank through the overflow valve.
By adopting the technical scheme, the overflow oil return way is arranged to play a role of protecting the oil cylinder, if the pressure of the oil cylinder is overlarge, the overflow valve is automatically opened, the oil in the rod cavity flows back to the oil tank through the overflow valve, and the pressure of the oil cylinder is relieved.
Further, the data acquisition unit comprises a pressure sensor, and the pressure sensor at least acquires the pressure P1 of the rodless cavity of the oil cylinder at the transmission side of the squeeze roll and the pressure P2 of the rodless cavity of the oil cylinder at the non-transmission side.
Due to the adoption of the technical scheme, the pressure P1 of the rodless cavity of the oil cylinder at the transmission side of the squeeze roller and the pressure P2 of the rodless cavity of the oil cylinder at the non-transmission side are acquired through the pressure sensor, when the difference value between the pressure P2 and the pressure P1 is larger than or equal to the set pressure threshold value delta P, the control unit sends control signals to the second electromagnetic reversing valve and the oil pump of the hydraulic control oil circuit at the transmission side, the oil pump works and conveys oil to the rod cavity through the second electromagnetic reversing valve, the pressure P1 of the hydraulic control oil circuit at the transmission side is increased, the width b1 of the roll gap at the transmission side is increased, and when the pressure P2 is equal to the pressure P1, the adjustment is completed, namely, the roll gap is adjusted by the hydraulic control system in a constant pressure mode.
Further, the pressure sensor is arranged between the energy accumulator and the rodless cavity of the oil cylinder and is used for collecting the pressure of the rodless cavity of the oil cylinder; the pressure sensor is in signal connection with the data processing unit, and pressure data of the rodless cavity of the oil cylinder is transmitted between the pressure sensor and the data processing unit.
By adopting the technical scheme, after the pressure sensor collects the pressure P1 and the pressure P2, the data are sent to the data processing unit, the data processing unit calculates the difference value between the pressure P2 and the pressure P1, judges whether the difference value is larger than or equal to a set threshold value, sends the judgment result to the control unit, and the control unit regulates and controls the roller press according to the judgment result so as to enable the roller press to work under the state of constant pressure and constant roll gap all the time.
Further, the data acquisition unit comprises a displacement sensor which at least acquires the roll gap width b1 of the transmission side and the roll gap width b2 of the non-transmission side of the squeeze roll; the displacement sensor is in signal connection with the data processing unit, and data of the roll gap width are transmitted between the displacement sensor and the data processing unit.
Due to the adoption of the technical scheme, the roll gap width b1 on the transmission side and the roll gap width b2 on the non-transmission side of the squeeze roll are acquired by the displacement sensor and sent to the data processing unit, the data processing unit calculates the difference value between the roll gap width b2 and the roll gap width b1, and judging whether the difference is greater than or equal to a set threshold value, and sending the judgment result to a control unit, when the difference value is more than or equal to the set roll gap threshold value delta b, the control unit sends control signals to a second electromagnetic directional valve of the transmission side hydraulic control oil path and the oil pump, the oil pump works, and the oil is delivered to the rod cavity through the second electromagnetic directional valve, the pressure P1 of the hydraulic control oil circuit at the transmission side is increased, the roll gap width b1 at the transmission side is increased, when the roll gap width b2 is equal to the roll gap width b1, the adjustment is completed, namely, the hydraulic control system adjusts the roll gap in a constant roll gap mode, and ensures that the roll squeezer always works under the conditions of constant pressure and constant roll gap.
Correspondingly, the invention also discloses a hydraulic control method, which is applied to a hydraulic control system of a roller press, wherein the hydraulic control system of the roller press comprises an energy accumulator, an oil cylinder, an oil pump and a squeeze roller, the oil pump is connected with a rod cavity of the oil cylinder to form a control oil path, and is connected with a rodless cavity of the oil cylinder to form an adjusting oil path, a first electromagnetic directional valve is arranged on the control oil path, the energy accumulator is arranged between the first electromagnetic directional valve and the rodless cavity of the oil cylinder, a second electromagnetic directional valve is arranged on the adjusting oil path, a piston of the oil cylinder is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil path is matched with the control oil path to form a hydraulic control oil path; the hydraulic control oil way for controlling the oil cylinder at the transmission side of the squeeze roll is a transmission side hydraulic control oil way, and the hydraulic control oil way for controlling the oil cylinder at the non-transmission side of the squeeze roll is a non-transmission side hydraulic control oil way; the method is characterized by comprising the following steps:
the collection step comprises: collecting the running data of the transmission side and the non-transmission side of the squeeze roll through a collecting unit, and sending the collected data to a data processing unit for processing;
a judging step: setting a threshold value, calculating a difference value of operating data of a non-transmission side and a transmission side by a data processing unit, judging whether the difference value is greater than or equal to the threshold value, and sending a judgment result to a control unit by the data processing unit;
the control steps are as follows: when the difference value received by the control unit is smaller than the threshold value, the second electromagnetic directional valve of the hydraulic control oil path at the transmission side is not powered, the rod cavity of the oil cylinder is not oil or pressure, when the difference value received by the control unit is larger than or equal to the threshold value, the control unit controls the second electromagnetic directional valve of the hydraulic control oil path at the transmission side to be powered, the oil pump is started, the oil pump is communicated with the rod cavity of the oil cylinder through the second electromagnetic directional valve and conveys oil to the rod cavity, when the difference value of the operation data at the non-transmission side and the operation data at the transmission side received by the control unit is 0, the control unit transmits a control signal to the second electromagnetic directional valve of the hydraulic control oil path at the transmission side to enable the second electromagnetic directional valve of the hydraulic control oil path at the transmission side not to be powered, transmits the control signal to the oil pump to close the oil pump, and the rod cavity of the oil cylinder is depressurized.
By adopting the technical scheme, the operation data of the roller press is acquired in real time through the acquisition step, whether the inclination degree of the roll gap between the two squeeze rolls exceeds a set threshold value is judged through the judgment step, the control unit controls a hydraulic control system of the roller press according to the result of the judgment step, the pressure P1 of a hydraulic control oil circuit on the transmission side is increased and the roll gap width b1 on the transmission side is increased in a manner of filling oil into a rod cavity of an oil cylinder on the transmission side, and finally the roller press is ensured to always work in a constant-pressure and constant-roll-gap state, so that the roller press can be stably produced, a bearing and the hydraulic control oil circuit are protected, and the service life of the roller press can be effectively prolonged.
Further, in the collecting step, the collecting unit comprises a pressure sensor, the pressure sensor collects the pressure P1 of the hydraulic control oil circuit on the transmission side of the squeeze roll and the pressure P2 of the hydraulic control oil circuit on the non-transmission side, and the pressure P1 and the pressure P2 collected by the pressure sensor are sent to the data processing unit for processing; in the judgment step, a pressure threshold value Δ P is set, the data processing unit calculates the difference between the pressure P2 and the pressure P1 and judges whether the difference is equal to or greater than the pressure threshold value Δ P, and the data processing unit sends the judgment result to the control unit.
Further, in the acquisition step, the acquisition unit comprises a displacement sensor, the displacement sensor acquires the roll gap width b1 on the transmission side and the roll gap width b2 on the non-transmission side of the squeeze roll, and the roll gap width b1 and the roll gap width b2 acquired by the displacement sensor are sent to the data processing unit for processing; in the judging step, a roll gap threshold value Δ b is set, the data processing unit calculates a difference between the roll gap width b2 and the roll gap width b1, and judges whether the difference is equal to or greater than the roll gap threshold value Δ b, and the data processing unit sends the judgment result to the control unit.
Furthermore, a pressure relief oil way is arranged on the adjusting oil way, one end of the pressure relief oil way is connected with a rod cavity of the oil cylinder through a second electromagnetic directional valve, and the other end of the pressure relief oil way is connected with the oil tank; in the control step, when the second electromagnetic directional valve is not electrified, the pressure relief oil path is communicated with the rod cavity of the oil cylinder through the second electromagnetic directional valve, and oil in the rod cavity enters the pressure relief oil path along the second electromagnetic directional valve to complete pressure relief of the rod cavity.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention can monitor the working state of the roller press in real time and automatically adjust when the roll gap between two extrusion rollers is inclined.
2. The invention ensures that the roller press always works under the state of constant pressure and constant roll gap, ensures that the roller press can be stably produced, protects the bearing and the hydraulic control oil circuit and can effectively prolong the service life of the roller press.
3. The invention adjusts the roll gap by filling oil into the rod cavity of the oil cylinder at the transmission side, and the oil in the rod cavity can automatically flow back to the oil tank after the adjustment is finished, thereby finishing the pressure relief.
4. The invention is provided with an overflow oil return path for protecting the oil cylinder, if the pressure of the oil cylinder is overlarge, the overflow valve is automatically opened, the oil in the rod cavity flows back to the oil tank through the overflow valve, and the pressure of the oil cylinder is relieved.
5. The data acquisition unit of the invention can adopt a pressure sensor to adjust the roll seam by a constant pressure adjusting mode (the pressure P1 of the driving side of the squeeze roll is equal to the pressure P2 of the non-driving side).
6. The data acquisition unit of the invention can adopt a displacement sensor to adjust the roll gap by a constant roll gap adjusting mode (the roll gap width b1 on the transmission side of the squeeze roll is equal to the roll gap width b2 on the non-transmission side).
Drawings
FIG. 1 is a schematic view of the inclined roll gap configuration of the present invention;
FIG. 2 is a schematic diagram of the hydraulic control system of the present invention;
fig. 3 is a schematic view of the structure of the adjusting of the squeeze roll of the present invention.
The labels in the figure are: 1-an energy accumulator, 2-a first throttle valve, 3-a first electromagnetic directional valve, 4-a pressure sensor, 5-an oil cylinder, 6-a second electromagnetic directional valve, 7-a one-way throttle valve, 8-an overflow valve, 9-a second throttle valve, 10-a third electromagnetic directional valve and 11-an oil pump.
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 for adjusting a roller press is disclosed, as shown in figures 1-3, and comprises an energy accumulator 1, an oil cylinder 5, an oil pump 11 and a squeeze roller, wherein the oil pump 11 is connected with a rod cavity of the oil cylinder 5 to form a control oil path, and is connected with a rodless cavity of the oil cylinder 5 to form an adjusting oil path, a first electromagnetic directional valve 3 is arranged on the control oil path, a second throttle valve 9 is arranged between the oil pump 11 and the first electromagnetic directional valve 3, and the second throttle valve 9 can control the flow passing through the first electromagnetic directional valve 3, so that the oil cylinder 5 is prevented from shaking due to overlarge flow; an energy accumulator 1 is arranged between the first electromagnetic directional valve 3 and a rodless cavity of the oil cylinder 5, a first throttle valve 2 is arranged between the energy accumulator 1 and the oil cylinder 5, and the first throttle valve 2 can control the flow between the energy accumulator 1 and the oil cylinder 5, so that the oil cylinder 5 is prevented from shaking due to overlarge flow; a control oil unloading branch is further arranged between the first electromagnetic directional valve 3 and the oil cylinder 5, a third electromagnetic directional valve 10 is arranged on the control oil unloading branch, and when the third electromagnetic directional valve 10 is powered on, oil in a rodless cavity of the oil cylinder 5 flows out along the control oil unloading branch; a second electromagnetic directional valve 6 is arranged on the adjusting oil way, a piston of the oil cylinder 5 is connected with the squeeze roll and drives the squeeze roll to move, and the adjusting oil way is matched with the control oil way to form a hydraulic control oil way; the hydraulic control oil way for controlling the squeeze roll transmission side oil cylinder 5 is a transmission side hydraulic control oil way, the hydraulic control oil way for controlling the squeeze roll non-transmission side oil cylinder 5 is a non-transmission side hydraulic control oil way, the hydraulic control oil way further comprises a data acquisition unit, a data processing unit and a control unit, the data acquisition unit is in signal connection with the data processing unit, the data processing unit is in signal connection with the control unit, and the second electromagnetic directional valve 6 is in signal connection and controlled by the control unit; the data acquisition unit acquires operation data of a transmission side and a non-transmission side of the squeeze roller, the data processing unit judges whether the squeeze roller needs to be adjusted according to the data acquired by the data acquisition unit, and the control unit controls the second electromagnetic directional valve 6 and the oil pump 11 of the hydraulic control oil way of the transmission side according to the judgment result of the data processing unit; when the second electromagnetic directional valve 6 of the hydraulic control oil path at the transmission side is electrified, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6 and conveys oil to the rod cavity, and the pressure and the roll gap width at the transmission side of the squeeze roll are adjusted. Specifically, the working state of the roller press is monitored in real time through the data acquisition unit, once the roll gap between two extrusion rolls is monitored to be inclined, the control unit sends control signals to the second electromagnetic directional valve 6 and the oil pump 11 of the hydraulic control oil path on the transmission side, the second electromagnetic directional valve 6 is electrified, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5, the oil pump 11 works to convey oil to the rod cavity, the pressure P1 of the hydraulic control oil path on the transmission side is increased, the roll gap width b1 on the transmission side is increased, finally, the pressure on the transmission side and the pressure on the non-transmission side can be basically equal while the roll gap width on the transmission side and the non-transmission side of the roller press are basically equal, the roller press can be stably produced, a bearing and the hydraulic control oil path are protected, and the service life of the roller press can be effectively prolonged.
And a pressure relief oil path is arranged on the oil adjusting path, one end of the pressure relief oil path is connected with a rod cavity of the oil cylinder 5 through a second electromagnetic directional valve 6, the other end of the pressure relief oil path is connected with the oil tank, and when the second electromagnetic directional valve 6 is not electrified, oil in the rod cavity flows back to the oil tank along the pressure relief oil path through the second electromagnetic directional valve 6. Specifically, after the oil in the rod cavity is adjusted to the roll gap, the second electromagnetic directional valve 6 is not electrified under the control of the control unit, the pressure relief oil path is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6, the oil in the rod cavity flows back to the oil tank from the self-pressure oil path, the pressure relief of the rod cavity is completed, and the roll squeezer returns to a normal working state.
A one-way throttle valve 7 is arranged between the second electromagnetic directional valve 6 and the oil cylinder 5, the one-way throttle valve 7 can control the flow entering the rod cavity of the oil cylinder 5, the shaking of the oil cylinder 5 caused by overlarge flow is prevented, meanwhile, the oil in the rod cavity can flow back to the oil tank through the one-way throttle valve 7 without obstruction, and the quick pressure relief of the rod cavity of the oil cylinder 5 is realized.
And an overflow oil return path is arranged between the second electromagnetic directional valve 6 and the rod cavity of the oil cylinder 5, the overflow oil return path is connected with the oil tank through an overflow valve 8, after the pressure of the rod cavity reaches a threshold value, the overflow valve 8 is opened, and the oil in the rod cavity flows back to the oil tank through the overflow valve 8. Specifically, an overflow oil return path is arranged to protect the oil cylinder 5, if the pressure of the oil cylinder 5 is too high, the overflow valve 8 is automatically opened, oil in the rod cavity flows back to the oil tank through the overflow valve 8, and the pressure of the oil cylinder 5 is relieved.
Example 2
A hydraulic control system for adjusting a roller press is shown in figures 1-3 and comprises an energy accumulator 1, an oil cylinder 5, an oil pump 11 and a squeeze roller, wherein the oil pump 11 is connected with a rod cavity of the oil cylinder 5 to form a control oil path and a rodless cavity of the oil cylinder 5 to form an adjusting oil path, a first electromagnetic directional valve 3 is arranged on the control oil path, the energy accumulator 1 is arranged between the first electromagnetic directional valve 3 and the rodless cavity of the oil cylinder 5, a second electromagnetic directional valve 6 is arranged on the adjusting oil path, a piston of the oil cylinder 5 is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil path is matched with the control oil path to form a hydraulic control oil path; the hydraulic control oil way for controlling the squeeze roll transmission side oil cylinder 5 is a transmission side hydraulic control oil way, the hydraulic control oil way for controlling the squeeze roll non-transmission side oil cylinder 5 is a non-transmission side hydraulic control oil way, the hydraulic control oil way further comprises a data acquisition unit, a data processing unit and a control unit, the data acquisition unit is in signal connection with the data processing unit, the data processing unit is in signal connection with the control unit, and the second electromagnetic directional valve 6 is in signal connection and controlled by the control unit; the data acquisition unit acquires operation data of a transmission side and a non-transmission side of the squeeze roller, the data processing unit judges whether the squeeze roller needs to be adjusted according to the data acquired by the data acquisition unit, and the control unit controls the second electromagnetic directional valve 6 and the oil pump 11 of the hydraulic control oil way of the transmission side according to the judgment result of the data processing unit; when the second electromagnetic directional valve 6 of the hydraulic control oil path at the transmission side is electrified, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6 and conveys oil to the rod cavity, and the pressure and the roll gap width at the transmission side of the squeeze roll are adjusted.
The data acquisition unit comprises a pressure sensor 4, and the pressure sensor 4 at least acquires the pressure P1 of the rodless cavity of the oil cylinder 5 on the transmission side of the squeeze roll and the pressure P2 of the rodless cavity of the oil cylinder 5 on the non-transmission side. Specifically, the pressure P1 of the rodless cavity of the squeeze roll transmission side oil cylinder 5 and the pressure P2 of the rodless cavity of the non-transmission side oil cylinder 5 are collected through the pressure sensor 4, when the difference value between the pressure P2 and the pressure P1 is larger than or equal to a set pressure threshold value delta P, the control unit sends control signals to the second electromagnetic directional valve 6 and the oil pump 11 of the transmission side hydraulic control oil circuit, the oil pump 11 works and conveys oil to the rod cavity through the second electromagnetic directional valve 6, the pressure P1 of the transmission side hydraulic control oil circuit is increased, the roll gap width b1 of the transmission side is increased, and when the pressure P2 is equal to the pressure P1, the adjustment is completed, namely, the roll gap is adjusted through a constant pressure mode by the hydraulic control system.
The pressure sensor 4 is arranged between the energy accumulator 1 and the rodless cavity of the oil cylinder 5 and is used for collecting the pressure of the rodless cavity of the oil cylinder 5; the pressure sensor 4 is in signal connection with the data processing unit, and pressure data of a rodless cavity of the oil cylinder 5 is transmitted between the pressure sensor 4 and the data processing unit. Specifically, after the pressure sensor 4 acquires the pressure P1 and the pressure P2, the data are sent to the data processing unit, the data processing unit calculates the difference between the pressure P2 and the pressure P1, judges whether the difference is greater than or equal to a set threshold value, and sends a judgment result to the control unit, and the control unit regulates and controls the roller press according to the judgment result, so that the roller press always works under the state of constant pressure and constant roll gap.
Example 3
A hydraulic control system for adjusting a roller press is shown in figures 1-3 and comprises an energy accumulator 1, an oil cylinder 5, an oil pump 11 and a squeeze roller, wherein the oil pump 11 is connected with a rod cavity of the oil cylinder 5 to form a control oil path and a rodless cavity of the oil cylinder 5 to form an adjusting oil path, a first electromagnetic directional valve 3 is arranged on the control oil path, the energy accumulator 1 is arranged between the first electromagnetic directional valve 3 and the rodless cavity of the oil cylinder 5, a second electromagnetic directional valve 6 is arranged on the adjusting oil path, a piston of the oil cylinder 5 is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil path is matched with the control oil path to form a hydraulic control oil path; the hydraulic control oil way for controlling the squeeze roll transmission side oil cylinder 5 is a transmission side hydraulic control oil way, the hydraulic control oil way for controlling the squeeze roll non-transmission side oil cylinder 5 is a non-transmission side hydraulic control oil way, the hydraulic control oil way further comprises a data acquisition unit, a data processing unit and a control unit, the data acquisition unit is in signal connection with the data processing unit, the data processing unit is in signal connection with the control unit, and the second electromagnetic directional valve 6 is in signal connection and controlled by the control unit; the data acquisition unit acquires operation data of a transmission side and a non-transmission side of the squeeze roller, the data processing unit judges whether the squeeze roller needs to be adjusted according to the data acquired by the data acquisition unit, and the control unit controls the second electromagnetic directional valve 6 and the oil pump 11 of the hydraulic control oil way of the transmission side according to the judgment result of the data processing unit; when the second electromagnetic directional valve 6 of the hydraulic control oil path at the transmission side is electrified, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6 and conveys oil to the rod cavity, and the pressure and the roll gap width at the transmission side of the squeeze roll are adjusted.
The data acquisition unit comprises a displacement sensor, and the displacement sensor acquires the roll gap width b1 of the transmission side and the roll gap width b2 of the non-transmission side of the squeeze roll; the displacement sensor is in signal connection with the data processing unit, and data of the roll gap width are transmitted between the displacement sensor and the data processing unit. Specifically, the roll gap width b1 of the transmission side and the roll gap width b2 of the non-transmission side of the squeeze roll are collected by a displacement sensor and sent to a data processing unit, the data processing unit calculates the difference value between the roll gap width b2 and the roll gap width b1, and judging whether the difference is greater than or equal to a set threshold value, and sending the judgment result to a control unit, when the difference value is larger than or equal to the set roll gap threshold value delta b, the control unit sends control signals to the second electromagnetic directional valve 6 of the transmission side hydraulic control oil path and the oil pump 11, the oil pump 11 works, and the oil is delivered to the rod cavity through the second electromagnetic directional valve 6, the pressure P1 of the hydraulic control oil circuit at the transmission side is increased, the roll gap width b1 at the transmission side is increased, when the roll gap width b2 is equal to the roll gap width b1, the adjustment is completed, namely, the hydraulic control system adjusts the roll gap in a constant roll gap mode, and ensures that the roll squeezer always works under the conditions of constant pressure and constant roll gap.
Example 4
A hydraulic control method is applied to a hydraulic control system of a roller press as shown in figures 1-3, wherein the hydraulic control system of the roller press comprises an energy accumulator 1, an oil cylinder 5, an oil pump 11 and a squeeze roller, the oil pump 11 is connected with a rod cavity of the oil cylinder 5 to form a control oil path, and is connected with a rodless cavity of the oil cylinder 5 to form an adjusting oil path, a first electromagnetic directional valve 3 is arranged on the control oil path, the energy accumulator 1 is arranged between the first electromagnetic directional valve 3 and the rodless cavity of the oil cylinder 5, a second electromagnetic directional valve 6 is arranged on the adjusting oil path, a piston of the oil cylinder 5 is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil path is matched with the control oil path to form a hydraulic control oil path; the hydraulic control oil way for controlling the squeeze roll transmission side oil cylinder 5 is a transmission side hydraulic control oil way, and the hydraulic control oil way for controlling the squeeze roll non-transmission side oil cylinder 5 is a non-transmission side hydraulic control oil way; the method is characterized by comprising the following steps:
the collection step comprises: collecting the running data of the transmission side and the non-transmission side of the squeeze roll through a collecting unit, and sending the collected data to a data processing unit for processing;
a judging step: setting a threshold value, calculating a difference value of operating data of a non-transmission side and a transmission side by a data processing unit, judging whether the difference value is greater than or equal to the threshold value, and sending a judgment result to a control unit by the data processing unit;
the control steps are as follows: when the difference value received by the control unit is smaller than the threshold value, the second electromagnetic directional valve 6 of the hydraulic control oil path at the transmission side is not powered, the rod cavity of the oil cylinder 5 is free of oil and pressure, when the difference value received by the control unit is greater than or equal to the threshold value, the control unit controls the second electromagnetic directional valve 6 of the hydraulic control oil path at the transmission side to be powered, the oil pump 11 is started, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6 and conveys oil to the rod cavity, and when the difference value of the operation data at the non-transmission side and the operation data at the transmission side received by the control unit is 0, the control unit transmits a control signal to the second electromagnetic directional valve 6 of the hydraulic control oil path at the transmission side to enable the second electromagnetic directional valve 6 of the hydraulic control oil path at the transmission side not to be powered, transmits the.
Specifically, the operation data of the roller press is collected in real time through the collection step, whether the inclination degree of the roller gap between two squeeze rollers exceeds a set threshold value is judged through the judgment step, the control unit controls a hydraulic control system of the roller press according to the result of the judgment step, the pressure P1 of a hydraulic control oil way on the transmission side is increased and the roller gap width b1 on the transmission side is increased in a manner of filling oil into a rod cavity of the oil cylinder 5 on the transmission side, and finally the roller press is ensured to work under the state of constant pressure and constant roller gap all the time, so that the roller press can be stably produced, a bearing and the hydraulic control oil way are protected, and the service life of the roller press can be effectively prolonged.
A pressure relief oil way is arranged on the oil regulating way, one end of the pressure relief oil way is connected with a rod cavity of the oil cylinder 5 through a second electromagnetic directional valve 6, and the other end of the pressure relief oil way is connected with an oil tank; in the control step, when the second electromagnetic directional valve 6 is not electrified, the pressure relief oil path is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6, and oil in the rod cavity enters the pressure relief oil path along the second electromagnetic directional valve 6 to complete pressure relief of the rod cavity.
Example 5
A hydraulic control method is applied to a hydraulic control system of a roller press as shown in figures 1-3, wherein the hydraulic control system of the roller press comprises an energy accumulator 1, an oil cylinder 5, an oil pump 11 and a squeeze roller, the oil pump 11 is connected with a rod cavity of the oil cylinder 5 to form a control oil path, and is connected with a rodless cavity of the oil cylinder 5 to form an adjusting oil path, a first electromagnetic directional valve 3 is arranged on the control oil path, the energy accumulator 1 is arranged between the first electromagnetic directional valve 3 and the rodless cavity of the oil cylinder 5, a second electromagnetic directional valve 6 is arranged on the adjusting oil path, a piston of the oil cylinder 5 is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil path is matched with the control oil path to form a hydraulic control oil path; the hydraulic control oil way for controlling the squeeze roll transmission side oil cylinder 5 is a transmission side hydraulic control oil way, and the hydraulic control oil way for controlling the squeeze roll non-transmission side oil cylinder 5 is a non-transmission side hydraulic control oil way; the method is characterized by comprising the following steps:
the collection step comprises: collecting the running data of the transmission side and the non-transmission side of the squeeze roll through a collecting unit, and sending the collected data to a data processing unit for processing;
a judging step: setting a threshold value, calculating a difference value of operating data of a non-transmission side and a transmission side by a data processing unit, judging whether the difference value is greater than or equal to the threshold value, and sending a judgment result to a control unit by the data processing unit;
the control steps are as follows: when the difference value received by the control unit is smaller than the threshold value, the second electromagnetic directional valve 6 of the hydraulic control oil path at the transmission side is not powered, the rod cavity of the oil cylinder 5 is free of oil and pressure, when the difference value received by the control unit is greater than or equal to the threshold value, the control unit controls the second electromagnetic directional valve 6 of the hydraulic control oil path at the transmission side to be powered, the oil pump 11 is started, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6 and conveys oil to the rod cavity, and when the difference value of the operation data at the non-transmission side and the operation data at the transmission side received by the control unit is 0, the control unit transmits a control signal to the second electromagnetic directional valve 6 of the hydraulic control oil path at the transmission side to enable the second electromagnetic directional valve 6 of the hydraulic control oil path at the transmission side not to be powered, transmits the.
In the collecting step, the collecting unit comprises a pressure sensor 4, the pressure sensor 4 collects the pressure P1 of the hydraulic control oil circuit on the transmission side of the squeeze roll and the pressure P2 of the hydraulic control oil circuit on the non-transmission side, and the pressure P1 and the pressure P2 collected by the pressure sensor 4 are sent to the data processing unit for processing; in the judgment step, a pressure threshold value Δ P is set, the data processing unit calculates the difference between the pressure P2 and the pressure P1 and judges whether the difference is equal to or greater than the pressure threshold value Δ P, and the data processing unit sends the judgment result to the control unit. Specifically, when the control unit receives a judgment result that the difference between the pressure P2 and the pressure P1 is smaller than the pressure threshold value Δ P, the second electromagnetic directional valve 6 of the transmission-side hydraulic control oil path is not powered, and the rod chamber of the oil cylinder 5 is not oil or pressure, and when the control unit receives a judgment result that the difference between the pressure P1 and the pressure P2 is greater than or equal to the pressure threshold value Δ P, the second electromagnetic directional valve 6 of the transmission-side hydraulic control oil path is powered, the oil pump 11 is communicated with the rod chamber of the oil cylinder 5 through the second electromagnetic directional valve 6 and delivers oil to the rod chamber, at this time, the pressure P1 rises, the roll gap width b1 of the transmission side increases, and when the control unit receives a judgment result that the pressure P1 is equal to the pressure P2, the second electromagnetic directional valve 6 of the transmission-side hydraulic control oil path is not powered, and the rod chamber of the oil cylinder 5 is depressurized.
Example 6
A hydraulic control method is applied to a hydraulic control system of a roller press as shown in figures 1-3, wherein the hydraulic control system of the roller press comprises an energy accumulator 1, an oil cylinder 5, an oil pump 11 and a squeeze roller, the oil pump 11 is connected with a rod cavity of the oil cylinder 5 to form a control oil path, and is connected with a rodless cavity of the oil cylinder 5 to form an adjusting oil path, a first electromagnetic directional valve 3 is arranged on the control oil path, the energy accumulator 1 is arranged between the first electromagnetic directional valve 3 and the rodless cavity of the oil cylinder 5, a second electromagnetic directional valve 6 is arranged on the adjusting oil path, a piston of the oil cylinder 5 is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil path is matched with the control oil path to form a hydraulic control oil path; the hydraulic control oil way for controlling the squeeze roll transmission side oil cylinder 5 is a transmission side hydraulic control oil way, and the hydraulic control oil way for controlling the squeeze roll non-transmission side oil cylinder 5 is a non-transmission side hydraulic control oil way; the method is characterized by comprising the following steps:
the collection step comprises: collecting the running data of the transmission side and the non-transmission side of the squeeze roll through a collecting unit, and sending the collected data to a data processing unit for processing;
a judging step: setting a threshold value, calculating a difference value of operating data of a non-transmission side and a transmission side by a data processing unit, judging whether the difference value is greater than or equal to the threshold value, and sending a judgment result to a control unit by the data processing unit;
the control steps are as follows: when the difference value received by the control unit is smaller than the threshold value, the second electromagnetic directional valve 6 of the hydraulic control oil path at the transmission side is not powered, the rod cavity of the oil cylinder 5 is free of oil and pressure, when the difference value received by the control unit is greater than or equal to the threshold value, the control unit controls the second electromagnetic directional valve 6 of the hydraulic control oil path at the transmission side to be powered, the oil pump 11 is started, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6 and conveys oil to the rod cavity, and when the difference value of the operation data at the non-transmission side and the operation data at the transmission side received by the control unit is 0, the control unit transmits a control signal to the second electromagnetic directional valve 6 of the hydraulic control oil path at the transmission side to enable the second electromagnetic directional valve 6 of the hydraulic control oil path at the transmission side not to be powered, transmits the control signal to the oil pump 11 to close the oil pump 11, and releases pressure of the rod cavity of the oil cylinder 5.
In the acquisition step, the acquisition unit comprises a displacement sensor, the displacement sensor acquires the roll gap width b1 of the transmission side and the roll gap width b2 of the non-transmission side of the squeeze roll, and the roll gap width b1 and the roll gap width b2 acquired by the displacement sensor are sent to the data processing unit for processing; in the judging step, a roll gap threshold value Δ b is set, the data processing unit calculates a difference between the roll gap width b2 and the roll gap width b1, and judges whether the difference is equal to or greater than the roll gap threshold value Δ b, and the data processing unit sends the judgment result to the control unit. When the difference between the roll gap width b2 and the roll gap width b1 is smaller than the roll gap threshold value delta b as a judgment result received by the control unit, the second electromagnetic directional valve 6 of the transmission side hydraulic control oil path is not powered, and the rod cavity of the oil cylinder 5 is free of oil and pressure, when the difference between the roll gap width b1 and the roll gap width b2 is larger than or equal to the roll gap threshold value delta b as the judgment result received by the control unit, the second electromagnetic directional valve 6 of the transmission side hydraulic control oil path is powered, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6 and conveys oil to the rod cavity, at the moment, the roll gap width b1 is increased, the pressure P1 of the transmission side hydraulic control oil path is increased until the roll gap width b1 is equal to the roll gap width b2 as the judgment result received by the control unit, the second electromagnetic directional valve 6 of the transmission side hydraulic control oil path is not powered, and the rod cavity of the oil cylinder 5 is relieved of pressure.
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 for adjusting a roller press comprises an energy accumulator (1), an oil cylinder (5), an oil pump (11) and a squeeze roller, wherein the oil pump (11) is connected with a rod cavity of the oil cylinder (5) to form a control oil way, and is connected with a rodless cavity of the oil cylinder (5) to form an adjusting oil way, a first electromagnetic directional valve (3) is arranged on the control oil way, the energy accumulator (1) is arranged between the first electromagnetic directional valve (3) and the rodless cavity of the oil cylinder (5), a second electromagnetic directional valve (6) is arranged on the adjusting oil way, a piston of the oil cylinder (5) is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil way is matched with the control oil way to form a hydraulic control oil way; the hydraulic control oil circuit of the control squeeze roll transmission side oil cylinder (5) is a transmission side hydraulic control oil circuit, and the hydraulic control oil circuit of the control squeeze roll non-transmission side oil cylinder (5) is a non-transmission side hydraulic control oil circuit, and is characterized in that: the electromagnetic reversing valve further comprises a data acquisition unit, a data processing unit and a control unit, wherein the data acquisition unit is in signal connection with the data processing unit, the data processing unit is in signal connection with the control unit, and the second electromagnetic reversing valve (6) is in signal connection and is controlled by the control unit; the data acquisition unit acquires operation data of a transmission side and a non-transmission side of the squeeze roller, the data processing unit judges whether the squeeze roller needs to be adjusted according to the data acquired by the data acquisition unit, and the control unit controls a second electromagnetic directional valve (6) and an oil pump (11) of a hydraulic control oil way of the transmission side according to the judgment result of the data processing unit; when the second electromagnetic directional valve (6) of the hydraulic control oil path at the transmission side is electrified, the oil pump (11) is communicated with the rod cavity of the oil cylinder (5) through the second electromagnetic directional valve (6) and conveys oil to the rod cavity, and the pressure and the roll gap width at the transmission side of the squeeze roll are adjusted.
2. The hydraulic control system for roller press adjustment of claim 1, wherein: and a pressure relief oil way is arranged on the oil adjusting way, one end of the pressure relief oil way is connected with a rod cavity of the oil cylinder (5) through a second electromagnetic directional valve (6), the other end of the pressure relief oil way is connected with the oil tank, and when the second electromagnetic directional valve (6) is not electrified, oil in the rod cavity flows back to the oil tank along the pressure relief oil way through the second electromagnetic directional valve (6).
3. The hydraulic control system for roller press adjustment of claim 2, wherein: and an overflow oil return path is arranged between the second electromagnetic directional valve (6) and the rod cavity of the oil cylinder (5), the overflow oil return path is connected with the oil tank through an overflow valve (8), after the pressure of the rod cavity reaches a threshold value, the overflow valve (8) is opened, and the oil in the rod cavity flows back to the oil tank through the overflow valve (8).
4. A hydraulic control system for roller press adjustment according to any one of claims 1 to 3, characterized in that: the data acquisition unit comprises a pressure sensor (4), and the pressure sensor (4) at least acquires the pressure P1 of a rodless cavity of the oil cylinder (5) at the transmission side of the squeeze roll and the pressure P2 of a rodless cavity of the oil cylinder (5) at the non-transmission side.
5. The hydraulic control system for roller press adjustment of claim 4, wherein: the pressure sensor (4) is arranged between the energy accumulator (1) and the rodless cavity of the oil cylinder (5) and is used for collecting the pressure of the rodless cavity of the oil cylinder (5); the pressure sensor (4) is in signal connection with the data processing unit, and pressure data of a rodless cavity of the oil cylinder (5) is transmitted between the pressure sensor (4) and the data processing unit.
6. A hydraulic control system for roller press adjustment according to any one of claims 1 to 3, characterized in that: the data acquisition unit comprises a displacement sensor, and the displacement sensor at least acquires the roll gap width b1 of the transmission side and the roll gap width b2 of the non-transmission side of the squeeze roll; the displacement sensor is in signal connection with the data processing unit, and data of the roll gap width are transmitted between the displacement sensor and the data processing unit.
7. A hydraulic control method is applied to a hydraulic control system of a roller press, the hydraulic control system of the roller press comprises an energy accumulator (1), an oil cylinder (5), an oil pump (11) and a squeeze roll, the oil pump (11) is connected with a rod cavity of the oil cylinder (5) to form a control oil path, a rodless cavity of the oil cylinder (5) is connected to form an adjusting oil path, a first electromagnetic directional valve (3) is arranged on the control oil path, the energy accumulator (1) is arranged between the first electromagnetic directional valve (3) and the rodless cavity of the oil cylinder (5), a second electromagnetic directional valve (6) is arranged on the adjusting oil path, a piston of the oil cylinder (5) is connected with the squeeze roll and drives the squeeze roll to move, and the adjusting oil path is matched with the control oil path to form a hydraulic control oil path; the hydraulic control oil way for controlling the squeeze roll transmission side oil cylinder (5) is a transmission side hydraulic control oil way, and the hydraulic control oil way for controlling the squeeze roll non-transmission side oil cylinder (5) is a non-transmission side hydraulic control oil way; the method is characterized by comprising the following steps:
the collection step comprises: collecting the running data of the transmission side and the non-transmission side of the squeeze roll through a collecting unit, and sending the collected data to a data processing unit for processing;
a judging step: setting a threshold value, calculating a difference value of operating data of a non-transmission side and a transmission side by a data processing unit, judging whether the difference value is greater than or equal to the threshold value, and sending a judgment result to a control unit by the data processing unit;
the control steps are as follows: when the difference value received by the control unit is smaller than the threshold value, the second electromagnetic directional valve (6) of the hydraulic control oil path at the transmission side is not powered, the rod cavity of the oil cylinder (5) is free of oil and pressure, when the difference value received by the control unit is larger than or equal to the threshold value, the control unit controls the second electromagnetic directional valve (6) of the hydraulic control oil path at the transmission side to be powered, the oil pump (11) is started, the oil pump (11) is communicated with the rod cavity of the oil cylinder (5) through the second electromagnetic directional valve (6), and oil is delivered to the rod cavity until the difference value of the operation data of the non-transmission side and the transmission side received by the control unit is 0, the control unit transmits a control signal to a second electromagnetic directional valve (6) of the hydraulic control oil circuit on the transmission side to ensure that the control signal is not electrified, transmits the control signal to the oil pump (11) to close the oil pump (11), and a rod cavity of the oil cylinder (5) is relieved.
8. The hydraulic control method according to claim 7, characterized in that: in the collecting step, the collecting unit comprises a pressure sensor (4), the pressure sensor (4) collects the pressure P1 of the hydraulic control oil circuit on the transmission side of the squeeze roll and the pressure P2 of the hydraulic control oil circuit on the non-transmission side, and the pressure P1 and the pressure P2 collected by the pressure sensor (4) are sent to the data processing unit for processing; in the judgment step, a pressure threshold value Δ P is set, the data processing unit calculates the difference between the pressure P2 and the pressure P1 and judges whether the difference is equal to or greater than the pressure threshold value Δ P, and the data processing unit sends the judgment result to the control unit.
9. The hydraulic control method according to claim 7, characterized in that: in the acquisition step, the acquisition unit comprises a displacement sensor, the displacement sensor acquires the roll gap width b1 of the transmission side and the roll gap width b2 of the non-transmission side of the squeeze roll, and the roll gap width b1 and the roll gap width b2 acquired by the displacement sensor are sent to the data processing unit for processing; in the judging step, a roll gap threshold value Δ b is set, the data processing unit calculates a difference between the roll gap width b2 and the roll gap width b1, and judges whether the difference is equal to or greater than the roll gap threshold value Δ b, and the data processing unit sends the judgment result to the control unit.
10. The hydraulic control method according to claim 7, 8, or 9, characterized in that: a pressure relief oil way is arranged on the oil adjusting way, one end of the pressure relief oil way is connected with a rod cavity of the oil cylinder (5) through a second electromagnetic directional valve (6), and the other end of the pressure relief oil way is connected with an oil tank; in the control step, when the second electromagnetic directional valve (6) is not powered on, the pressure relief oil path is communicated with the rod cavity of the oil cylinder (5) through the second electromagnetic directional valve (6), and oil in the rod cavity enters the pressure relief oil path along the second electromagnetic directional valve (6) to complete pressure relief of the rod cavity.
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| CN202110713865.2A CN113251029A (en) | 2021-06-25 | 2021-06-25 | Hydraulic control system and method for adjusting roller press |
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| CN202110713865.2A CN113251029A (en) | 2021-06-25 | 2021-06-25 | Hydraulic control system and method for adjusting roller press |
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| CN113251029A true CN113251029A (en) | 2021-08-13 |
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| CN211975539U (en) * | 2020-03-11 | 2020-11-20 | 宜春万申制药机械有限公司 | Hydraulic system with pressure maintaining and stabilizing functions |
| CN217207130U (en) * | 2021-06-25 | 2022-08-16 | 成都利君实业股份有限公司 | Hydraulic control equipment for adjusting roller press |
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2021
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| JPS58135753A (en) * | 1982-02-08 | 1983-08-12 | Kawasaki Steel Corp | Hydraulic circuit for preventing dropping of ingot and dummy bar in continuous casting machine |
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