CN211755556U - Hydraulic loading and adjusting system and roller mill using same - Google Patents
Hydraulic loading and adjusting system and roller mill using same Download PDFInfo
- Publication number
- CN211755556U CN211755556U CN201920842422.1U CN201920842422U CN211755556U CN 211755556 U CN211755556 U CN 211755556U CN 201920842422 U CN201920842422 U CN 201920842422U CN 211755556 U CN211755556 U CN 211755556U
- Authority
- CN
- China
- Prior art keywords
- hydraulic
- loading
- pressure
- accumulator
- hydraulic oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 91
- 238000004891 communication Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 230000003750 conditioning effect Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 37
- 230000001105 regulatory effect Effects 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 8
- 239000003921 oil Substances 0.000 description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000004146 energy storage Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Landscapes
- Crushing And Grinding (AREA)
Abstract
The utility model provides a hydraulic pressure loading and governing system and use its roller mill, this hydraulic pressure loading and governing system include at least one hydraulic pressure loading and regulating unit and hydraulic control system, and each in at least one hydraulic pressure loading and the regulating unit all includes: a hydraulic cylinder; the hydraulic pump station is respectively communicated with a rod cavity and a rodless cavity of the hydraulic oil cylinder; the first energy accumulator is connected to a rod cavity of the hydraulic oil cylinder through a high-pressure hose; and the second energy accumulator is connected to the rodless cavity of the hydraulic oil cylinder through a high-pressure hose, wherein the hydraulic control system is connected with the hydraulic pump station to control the amount of hydraulic oil supplied to the hydraulic oil cylinder. The utility model provides a roll-type mill with hydraulic pressure loading and governing system can be according to material characteristic dynamic adjustment loading power to quick response roll-type mill absorbs the impact vibrations of mill during operation stock bed at the change of grinding material in-process stock bed thickness, promotes mill operation stationarity.
Description
Technical Field
The utility model relates to a hydraulic pressure loading and regulation field, more specifically relates to a roll-type mill with hydraulic pressure loading and governing system.
Background
In the operation process of the roller mill, a piston rod of the hydraulic oil cylinder pressurizes a grinding roller of the mill to mill and crush materials, and a rodless cavity of the hydraulic oil cylinder is directly communicated with an oil tank of a hydraulic pump station and has no working pressure. In the feeding process of the mill, the conditions of feeding amount variation and uneven material particle size often occur, the feeding amount variation can cause the thickness variation of a material bed, the material particle size variation can also cause the thickness of a local material bed to be suddenly increased or reduced, and the conditions can cause frequent fluctuation of the grinding roller on the material bed to generate vibration.
In the existing mill hydraulic system, a bag type energy accumulator arranged on a rod cavity loop of a hydraulic oil cylinder is usually arranged on a hydraulic station and is at a certain distance or far away from the hydraulic oil cylinder. When the thickness of the material bed is increased, because the hydraulic loop is long and narrow, hydraulic oil in the rod cavity of the hydraulic oil cylinder cannot enter the energy accumulator in a short time, the hydraulic oil cylinder cannot respond to the instantaneously changed thickness of the material bed, the oil pressure of the hydraulic oil in the rod cavity of the hydraulic oil cylinder is changed rapidly, and the grinding roller generates rigid vibration along with the change. When the thickness of the material bed is suddenly reduced, the grinding roller can directly impact the grinding disc under the action of the pressure of the rod cavity of the hydraulic oil cylinder due to the fact that the rodless cavity has no working pressure, so that the grinding machine generates impact vibration, the impact vibration has great influence on the running stability of the grinding machine, and even the grinding machine is stopped and cannot work.
For some roller mills with high design capacity, in order to meet the capacity requirement, the nitrogen charging pressure in the bag type energy accumulator connected with the rod cavity of the hydraulic oil cylinder needs to match the working pressure required by the rod cavity of the hydraulic oil cylinder and adapt to a certain working pressure range without adjustment. When the actual production load is insufficient and the mill is required to operate at 60% or below the designed production capacity, the required working pressure of the rod cavity of the hydraulic oil cylinder needs to be further reduced, the nitrogen charging pressure of the bag type accumulator at the moment cannot adapt to the required working pressure of the rod cavity of a new hydraulic oil cylinder, and the machine needs to be stopped to adjust the nitrogen charging pressure of the bag type accumulator to match the reduced pressure of the rod cavity of the hydraulic oil cylinder. Meanwhile, when the mill is required to operate under the condition that the capacity of the mill is seriously lower than the designed capacity, for example, the capacity is below 25 percent, due to the self-weight of the grinding roller, even if the pressure of the hydraulic oil cylinder is set to be in a lower state, the grinding pressure provided by the grinding roller under the action of the hydraulic oil cylinder and the self-weight exceeds the requirement, the grinding roller can frequently impact the grinding disc, the mill is vibrated and stopped, and the mill cannot normally operate under the condition of low capacity.
In addition, when the grinding roller needs to be quickly lifted in an emergency or an overhaul state of the grinding machine, the hydraulic pump station provides oil for the rodless cavity of the hydraulic cylinder through the oil pump, meanwhile, the oil in the rod cavity of the hydraulic cylinder flows back to the hydraulic pump station, and the piston rod of the hydraulic cylinder extends out to drive the grinding roller to lift. But because of the oil supply capacity of the oil pump, the grinding roller is slowly lifted, and the quick lifting can not be realized in an emergency state.
In addition, the distance between each hydraulic cylinder of the mill and a hydraulic pump station is different, and the piezoresistance in a hydraulic loop is different, so that when the mill is put into operation or exits, the loop flow and the pressure of each hydraulic cylinder are slightly different, the cylinder actions are asynchronous, and the mill cannot be put into operation smoothly or the grinding roller is abraded asynchronously in serious cases, thereby bringing great troubles to operation and maintenance.
SUMMERY OF THE UTILITY MODEL
In order to solve the above technical problem, an aspect of the present invention provides a hydraulic loading and adjusting system, which includes at least one hydraulic loading and adjusting unit and a hydraulic control system, each of the at least one hydraulic loading and adjusting unit includes:
a hydraulic cylinder;
the hydraulic pump station is respectively communicated with a rod cavity and a rodless cavity of the hydraulic oil cylinder;
the first energy accumulator is connected to a rod cavity of the hydraulic oil cylinder through a high-pressure hose; and
a second accumulator connected to the rodless cavity of the hydraulic cylinder through a high-pressure hose,
the hydraulic control system is connected with the hydraulic pump station to control the amount of hydraulic oil supplied to the hydraulic oil cylinder.
In one embodiment, the first accumulator is a bladder accumulator and the second accumulator is a piston accumulator.
In one embodiment, the first accumulator and the second accumulator are both disposed proximate the hydraulic ram.
In one embodiment, each of the at least one hydraulic loading and adjustment units further comprises a first makeup control valve disposed on or in a direct connection of the rod and rodless chambers of the hydraulic ram, and the first makeup control valve is in communication with the hydraulic control system.
In one embodiment, the hydraulic loading and regulating system further comprises a second fluid-replenishing control valve disposed on a line for communicating with the hydraulic pump station to deliver hydraulic oil to the rod chamber and the rodless chamber, respectively, in the at least one hydraulic loading and regulating unit.
In one embodiment, each of the at least one hydraulic loading and adjustment units further comprises two one-way throttles, the two one-way throttles being oppositely disposed on a hose connecting the hydraulic power unit with the rodless chamber of the hydraulic ram.
In one embodiment, the hydraulic loading and regulating system further comprises a first pressure transmitter and a second pressure transmitter, wherein the first pressure transmitter is disposed on a conduit for connecting the hydraulic pumping station with the rod cavity of the hydraulic ram in each of the at least one hydraulic loading and regulating unit, the second pressure transmitter is disposed on a conduit for connecting the hydraulic pumping station with the rodless cavity of the hydraulic ram in each of the at least one hydraulic loading and regulating unit, and the first pressure transmitter and the second pressure transmitter are respectively in communication with the hydraulic control system.
Another aspect of the present invention provides a roller mill using the above hydraulic loading and adjusting system, including:
the grinding disc can rotate under the driving of the driving device;
a plurality of grinding rollers connected to the hydraulic cylinder of a respective one of the plurality of hydraulic loading and adjusting units in the hydraulic loading and adjusting system by rocker arms, and located above the grinding disc; and
a mill control system, the mill control system including a hydraulic control system, and the mill control system in communication with the drive device to control the action of the grinding disc.
In one embodiment, the grinding roller is connected to the piston rod of the hydraulic ram of each of the plurality of hydraulic loading and adjustment units via a rocker arm.
In one embodiment, the pressure of the rodless chamber of the hydraulic ram in each of the hydraulic loading and conditioning systems is between 1.5MPa and 3 MPa.
According to the above description, the roller mill with the hydraulic loading and adjusting system provided by the utility model can dynamically adjust the loading force according to the material characteristics, so as to quickly respond to the change of the thickness of the material bed of the roller mill in the process of grinding the material, absorb the impact shock of the material bed when the mill works, and improve the running stability of the mill; the piston energy accumulator is arranged in a rodless cavity hydraulic loop of the hydraulic oil cylinder, so that the problem that a high-yield grinding machine cannot stably work in a low-yield state is solved; in addition, through the configuration of the piston energy accumulator and reasonable grinding pressure setting, on the premise of not adjusting the nitrogen charging pressure of the rod cavity bag type energy accumulator, the production capacity of the mill can be dynamically adjusted according to the actual load requirement, stable production operation of the mill under low load is realized, and the production efficiency is improved; in the maintenance or emergency state, can lift the roller fast, ensure safe and reliable, practice thrift the maintenance time.
Drawings
FIG. 1 is a schematic structural diagram of a hydraulic loading and adjustment system according to an exemplary embodiment of the present invention; and
fig. 2 is a schematic structural view of a roller mill having the hydraulic loading and conditioning system shown in fig. 1, according to an exemplary embodiment of the present invention.
Detailed Description
Illustrative, non-limiting embodiments of the present invention are described in detail below with reference to the accompanying drawings, further illustrating a roller mill having a hydraulic loading and conditioning system in accordance with the present invention.
Referring to fig. 1, the utility model provides a roller mill with hydraulic loading and governing system includes mill 2, a plurality of grinding roller 3 to a plurality of grinding rollers 3 are connected with hydraulic loading and governing system through rocking arm 4, and wherein, hydraulic loading and governing system include at least one hydraulic loading and governing unit, and each in this at least one hydraulic loading and governing unit includes hydraulic power unit 51, hydraulic cylinder 52, first energy storage ware 53 and second energy storage ware 54, in order to realize hydraulic loading and regulation.
The grinding disc 2 is a disc-type device, can bear materials to be ground, and can rotate under the driving of the driving device 1. The size, material, strength, etc. of the grinding disc 2 may be selected by those skilled in the art according to the properties of the material to be ground and the total amount of the material to be ground in a single time, and are not particularly limited herein. The driving device 1 may be an electric driving device, a pneumatic driving device, or the like, and is not particularly limited herein.
The grinding rollers 3 are connected to the piston rods of the hydraulic cylinders 52 of a corresponding one of the hydraulic loading and adjusting units in the hydraulic loading and adjusting system through corresponding rocker arms 4, and the grinding rollers 3 are positioned above the grinding disc 2 to grind the material on the grinding disc 2 under the action of the hydraulic loading and adjusting system.
The hydraulic loading and adjustment system comprises a plurality of hydraulic loading and adjustment units, each connected to a respective one of the plurality of grinding rollers 3 via a rocker arm 4 to provide power to the grinding rollers 3 to move up and down and to provide a damping effect in the event of a sharp change in the thickness of the material on the grinding disc 2.
In each hydraulic loading and regulating unit, a hydraulic pumping station 51 communicates with the rod and rodless chambers of the hydraulic ram 52, respectively, to deliver hydraulic oil to the rod and rodless chambers, respectively. In one embodiment, the hydraulic pump station 51 is connected to the rodless and rod-containing cavities of the hydraulic rams 52 by steel pipes and high pressure hoses, i.e., the lines connecting the hydraulic pump station 51 to the hydraulic rams 52 are in turn comprised of steel pipes and high pressure hoses, with the high pressure hoses being located close to the hydraulic rams 52. It should be noted that, the hydraulic pump station 51 and the hydraulic cylinder 52 used in the present invention may be any hydraulic pump station 51 and hydraulic cylinder 52 commonly used in the field, and those skilled in the art may select the specifications of the hydraulic pump station 51 and the hydraulic cylinder 52 according to specific working conditions, and are not specifically limited herein.
In each hydraulic loading and adjusting unit, the first accumulator 53 is connected to the rod cavity of the hydraulic oil cylinder 52 through a high-pressure hose, and the second accumulator 54 is connected to the rodless cavity of the hydraulic oil cylinder 52 through a high-pressure hose, so that the hydraulic oil pressure in the rod cavity and the rodless cavity of the hydraulic oil cylinder 52 is respectively adjusted by using the first accumulator 53 and the second accumulator 54, the pressure values of the rod cavity and the rodless cavity are maintained, the pressure values are not changed sharply, and the effect of reducing the system vibration is achieved.
It can be known from the above description that the utility model provides a hydraulic loading and governing system makes hydraulic cylinder 52 have the pole chamber and the no pole chamber to carry out hydraulic oil exchange with first energy storage 53 and second energy storage 54 fast through set up respectively with hydraulic cylinder 52 have the pole chamber and be connected with no pole chamber in every hydraulic loading and governing unit to the pole chamber and the no pole chamber that make hydraulic cylinder 52, in order to respond the change of the material thickness on mill 2, reduce the impact of grinding roller 3 to mill 2, reduce equipment wearing and tearing.
Referring to fig. 1, in one embodiment of the present invention, first accumulator 53 is a bladder accumulator and second accumulator 54 is a piston accumulator. The bag-type energy accumulator is a device composed of, for example, an inflation valve, an air bag, a shell, an oil port and the like, and in the process of supplying hydraulic oil into the bag-type energy accumulator through the oil port, the volume of gas is reduced along with the increase of pressure, so that hydraulic energy storage is realized; when the pressure of hydraulic oil in the bag type energy accumulator is lower than the pressure of nitrogen in the air bag, the volume of the air bag is increased, and the energy accumulator discharges the hydraulic oil under the pushing of the expansion pressure of the gas. The bag type energy accumulator can completely separate gas from oil, can prevent hydraulic oil from being oxidized, and has the characteristic of flexible reaction due to small gas inertia. Therefore, connecting the rod chamber of the hydraulic cylinder 52 with the bladder accumulator through the high pressure hose can quickly respond to the impact, i.e., when the thickness of the material on the grinding disc 2 suddenly increases or decreases, the bladder accumulator can quickly respond accordingly to reduce the impact between the grinding roller 3 and the material on the grinding disc 2. The piston type energy accumulator separates gas from hydraulic oil by using the piston, and due to the self weight of the piston, the piston type energy accumulator has hysteresis to pressure induction, but has little limitation to external oil pressure, and the adjustable oil pressure range is large. Therefore, the rod cavity of the hydraulic oil cylinder 52 in each hydraulic loading and adjusting unit is connected with the bag type energy accumulator, so that the external impact can be quickly responded; the rodless cavity of the hydraulic oil cylinder 52 of each hydraulic loading and adjusting unit is connected with the piston energy accumulator, so that when the pressure output outwards by the hydraulic loading and adjusting system is large in change, the pressure of the rodless cavity can be adjusted by the piston energy accumulator to offset the pressure of the side with the rod cavity, the hydraulic loading and adjusting system can work in a stable interval, the work of the grinding machine is not required to be stopped to adjust the nitrogen charging pressure of the bag type energy accumulator, the working efficiency of the grinding machine is improved, and automatic production is realized. For example, when the roller mill is operating at low capacity, the operating pressure can be stabilized within a useful range without stopping the mill operation to adjust the nitrogen charge pressure of the bladder accumulator.
In one embodiment, to improve the efficiency of hydraulic oil exchange between the accumulators and hydraulic cylinder 52, first and second accumulators 53, 54 are each located close to hydraulic cylinder 52, i.e. the length of the hoses connecting first and second accumulators 53, 54 to hydraulic cylinder 52 is reduced as much as possible as the installation space allows, for example, the length of the hoses between first and second accumulators 53, 54 and hydraulic cylinder 52 are each within 1 meter.
Referring to fig. 1, a first makeup control valve 55 is also installed in each hydraulic loading and adjusting unit, and the first makeup control valve 55 is provided on a hose for connecting the rod chamber and the rodless chamber of the hydraulic cylinder 52. For example, when the grinding roller 3 needs to be lifted quickly by lifting the piston rod of the hydraulic cylinder 52 (for example, when the grinding roller needs to be lifted quickly due to sudden stop of the grinding machine for safety reasons and foreign matters enter the grinding machine, or the grinding roller 3 is lifted quickly to the highest position for maintenance), the hydraulic pump station 51 replenishes hydraulic oil to the rodless cavity, opens the first liquid replenishing control valve 55 between the rodless cavity and the rod cavity, and allows the hydraulic oil in the rod cavity to flow into the rodless cavity under the action of the oil pressure difference between the rodless cavity and the rod cavity, thereby further accelerating the extension speed of the piston rod of the hydraulic cylinder 52. In another embodiment of the present invention, the hydraulic loading and adjusting unit further includes a second fluid-replenishing control valve 57, as shown in fig. 2, the second fluid-replenishing control valve 57 is disposed on a pipeline for communicating with the hydraulic pump station respectively to the rod chamber and the rodless chamber of the at least one hydraulic loading and adjusting unit. When the grinding roller 3 needs to be lifted quickly by lifting the piston rod of the hydraulic oil cylinder 52, the hydraulic pressure difference between the rod cavity and the rodless cavity can be quickly balanced through the second liquid supplementing control valve 57, so that the hydraulic oil in the rod cavity flows into the rodless cavity. It should be noted that only one of first makeup control valve 55 and second makeup control valve 57 is typically provided in the same hydraulic loading and regulating system.
In one embodiment, each hydraulic loading and regulating unit further comprises two one-way throttles 56, the two one-way throttles 56 being arranged opposite each other on a line connecting the rodless chambers of the hydraulic power unit 51 and the hydraulic ram 52. The two one-way throttle valves 56 can realize the two-way control of the hydraulic oil between the rodless cavities of the hydraulic pump station 51 and the hydraulic oil cylinder 52, namely, the flow of the hydraulic oil in two directions is independently controlled, the rise and the fall of each grinding roller are ensured to be synchronous, and the fast rise and the slow fall of each grinding roller can be controlled. The flow rate of oil pressure and the pressure resistance in each hydraulic loading and regulating unit can be controlled by installing a one-way throttle valve 56 in the unit, thereby ensuring synchronous operation of the hydraulic cylinders 52.
Referring to fig. 1, the hydraulic loading and regulating system further comprises a first pressure transducer 57 and a second pressure transducer 58. The first pressure transmitter 57 is arranged on a pipeline for connecting the hydraulic pump station 51 with the rod cavity of at least one hydraulic oil cylinder 52 in at least one hydraulic loading and adjusting unit, the second pressure transmitter 58 is arranged on a pipeline for connecting the hydraulic pump station 51 with the rodless cavity of at least one hydraulic oil cylinder 52 in at least one hydraulic loading and adjusting unit, the second pressure transmitter is respectively used for monitoring the oil pressure of all rod cavity loops and rodless cavity loops in at least one hydraulic loading and adjusting unit, the oil pressure value is fed back to the mill control system, and the mill control system adjusts the specific hydraulic oil pressure in the hydraulic loading and adjusting system according to the capacity requirement of the roller mill. That is, in the working process of the mill, the first pressure transmitter 57 and the second pressure transmitter 58 convert the pressure values into electric signals in real time and feed back the electric signals to the mill control system, and the mill control system can adjust and correct the pressure set value according to the capacity requirement of the mill, when the pressure of the rod cavity and the rodless cavity of each hydraulic cylinder 52 is lower than the preset value, the mill control system sends a control instruction to the hydraulic pump station 51, and the hydraulic pump station 51 supplements hydraulic oil to the hydraulic cylinders to increase the pressure until the pressure reaches the preset value, so that the hydraulic pump station 51 automatically stops working; when the thickness and/or the property of the ground material are changed, the grinding machine control system can automatically compensate and adjust according to different preset pressure offset of the material. It should be noted that the required grinding force is calculated according to the characteristics (mainly grindability index) of the ground material, the yield and the fineness index of the finished product, and then the required grinding force is converted into a pressure value of a rod cavity of the hydraulic oil cylinder 52, and the pressure value is used as the hydraulic oil pressure set by the control system.
The operation of the roller mill with hydraulic loading and adjustment system of the present invention will now be described with reference to fig. 1 and 2.
The driving device 1 is started to drive the grinding disc 2 to rotate, and in the rotating process of the grinding disc 2, materials are ground through the pressure of the materials applied to the grinding disc 2 by the grinding roller 3. The hydraulic pump station 51 supplies hydraulic oil to the rodless chamber of each hydraulic cylinder 52 of the hydraulic loading and adjusting system to maintain the rodless chamber of each hydraulic cylinder 52 at an initial preset pressure value, for example, the pressure of the rodless chamber of the hydraulic cylinder 52 in each hydraulic loading and adjusting unit is between 1.5mPa and 3mPa, to grind the material by the pressure of the material applied to the grating disc 2 by the grinding roller 3 during rotation of the grating disc 2. The hydraulic pump station 51 supplies hydraulic oil to the rod cavity of each hydraulic oil cylinder 52, so that the hydraulic oil cylinders 52 contract under the pressure of the hydraulic oil in the rod cavity, the grinding rollers 3 press down, and the grinding mill enters a normal grinding state.
When the thickness of the material on the grinding disc 2 is suddenly reduced, the hydraulic oil in the rodless cavity of each hydraulic oil cylinder 52 in the hydraulic loading and adjusting system can be pressed into the piston accumulator, so that the pressure of the rodless cavity is increased, and the descending speed of the grinding rollers 3 is slowed down; meanwhile, the hydraulic oil in the bag-type energy accumulator connected with the rod cavity of each hydraulic oil cylinder 52 can be supplemented into the rod cavity of the corresponding hydraulic oil cylinder 52, so that the pressure of the rod cavity is reduced, the lower pressure of the grinding rollers 3 is reduced, the grinding pressure is reduced, and the impact of the grinding rollers 3 on the grinding disc 2 is reduced, thereby realizing the buffering effect and reducing the equipment loss. When the thickness of the material on the grinding disc 2 is recovered to a normal value, the grinding rollers 3 are lifted, the hydraulic oil in the corresponding piston energy accumulator connected with the rodless cavity of each hydraulic oil cylinder 52 is supplemented into the rodless cavity of the corresponding hydraulic oil cylinder 52, so that the pressure of the rodless cavity is reduced, the hydraulic oil in the rod cavity of each hydraulic oil cylinder 52 is pressed into the corresponding bag-type energy accumulator again, the pressure of the rodless cavity is raised and recovered to a preset pressure value, the pressure under the grinding rollers 3 is raised accordingly, the grinding pressure is increased, and the grinding machine enters a normal grinding working state.
When large-particle-size materials pass through or the thickness of the materials is suddenly increased, the grinding rollers 3 rise, the pressure of a rod cavity of each hydraulic oil cylinder 52 rises, hydraulic oil in the rod cavity quickly enters the bag-type energy accumulator corresponding to the rod cavity under the action of pressure, and the grinding rollers 3 are lifted up along with the rod cavity to relieve the rigid impact of the grinding rollers 3 on the grinding disc 2; at the same time, hydraulic oil in the respective piston accumulator associated with the rodless cavity of each hydraulic cylinder 52 is replenished into the rodless cavity of the respective hydraulic cylinder 52. When the thickness of the material bed is recovered to a normal value, the grinding rollers 3 are descended, hydraulic oil in the bag type energy accumulator is supplemented into rod cavities of the corresponding hydraulic oil cylinders 52, so that the pressure of the rod cavities is reduced and recovered to a preset pressure value, the hydraulic oil in rodless cavities of each hydraulic oil cylinder 52 is pressed into the corresponding piston energy accumulator again, the pressure of the rodless cavities is increased and recovered to a set value, the pressure of the grinding rollers 3 is reduced accordingly, the grinding pressure is recovered to a normal value, and the grinding machine enters a normal grinding working state.
When the grinding roller 3 needs to be lifted urgently in case of maintenance of the grinding machine or special conditions, the hydraulic loading and adjusting system automatically opens the first liquid supplementing control valve 55, and hydraulic oil in the rod cavity directly enters the rodless cavity by utilizing the pressure difference between the rod cavity and the rodless cavity of the oil cylinder. When the differential pressure between the rod chamber and the rodless chamber of hydraulic cylinder 52 is lower than the set value, first replenishment control valve 55 is closed. Meanwhile, oil liquid provided by the hydraulic pump can also enter the rodless cavity, so that a piston rod of the oil cylinder can extend out quickly, the grinding roller 3 is lifted to a safe height, and the stability and reliability of the system are ensured.
In the process of changing the thickness of the material on the grinding disc 2, the hydraulic pump station 51 is in a non-operating state, no hydraulic exchange exists between the hydraulic pump station 51 and the hydraulic oil cylinder 52, and hydraulic oil is exchanged only between the rod cavity of the hydraulic oil cylinder 52 in each hydraulic loading and adjusting unit and the first energy accumulator 53 and between the rodless cavity of the hydraulic oil cylinder 52 and the second energy accumulator 54. Because the first accumulator 53, the second accumulator 54 and the hydraulic oil cylinder 52 are flexibly connected through the high-pressure hose, the slight swing of the hydraulic oil cylinder 52 and the impact of pressure oil can be absorbed by the high-pressure hose, so that the hydraulic circuit has no impact of pressure oil and is safe and stable.
When the actual load is low, namely, the roller mill runs in a low-capacity state, the pressure value of the rodless cavity of each hydraulic oil cylinder 52 is increased to offset the working pressure of the rod cavity of each hydraulic oil cylinder 52 and the self weight of the grinding roller 3, and the grinding pressure is maintained in a reasonable range to ensure the stable and safe running of the mill without adjusting the nitrogen charging pressure of the bag type energy accumulator.
Claims (10)
1. A hydraulic loading and adjustment system, characterized in that it comprises at least one hydraulic loading and adjustment unit and a hydraulic control system, each of said at least one hydraulic loading and adjustment unit comprising:
a hydraulic cylinder;
the hydraulic pump station is respectively communicated with the rod cavity and the rodless cavity of the hydraulic oil cylinder;
the first accumulator is connected to a rod cavity of the hydraulic oil cylinder through a high-pressure hose; and
a second accumulator connected to the rodless cavity of the hydraulic ram by a high pressure hose,
the hydraulic control system is connected with the hydraulic pump station to control the amount of hydraulic oil supplied to the hydraulic oil cylinder.
2. The hydraulic loading and adjustment system according to claim 1, wherein the first accumulator is a bladder accumulator and the second accumulator is a piston accumulator.
3. The hydraulic loading and adjustment system of claim 1, wherein the first accumulator and the second accumulator are both disposed proximate the hydraulic ram.
4. The hydraulic loading and adjustment system according to claim 1, wherein each of said at least one hydraulic loading and adjustment units further comprises a first makeup control valve disposed on a direct connection of the rod and rodless chambers of said hydraulic ram, and said first makeup control valve is in communication with said hydraulic control system.
5. The hydraulic loading and adjustment system according to claim 1, further comprising a second fluid replenishment control valve disposed on a conduit of a conduit for communicating the hydraulic pumping station to deliver hydraulic oil to the rod and rodless chambers of the at least one hydraulic loading and adjustment unit, respectively.
6. The hydraulic loading and adjustment system according to claim 1, wherein each of said at least one hydraulic loading and adjustment units further comprises two one-way throttles, said two one-way throttles being oppositely disposed on hoses for connecting said hydraulic pump station with rodless chambers of said hydraulic rams.
7. The hydraulic loading and adjustment system according to claim 1, characterized in that it further comprises a first pressure transmitter and a second pressure transmitter, wherein the first pressure transmitter is arranged on a pipeline for connecting the hydraulic pumping station with the rod chambers of the hydraulic rams in each of the at least one hydraulic loading and adjustment unit, the second pressure transmitter is arranged on a pipeline for connecting the hydraulic pumping station with the rodless chambers of the hydraulic rams in each of the at least one hydraulic loading and adjustment unit, and the first pressure transmitter and the second pressure transmitter are in communication with the hydraulic control system, respectively.
8. A roller mill using the hydraulic loading and adjustment system of any of claims 1-7, characterized in that the roller mill comprises:
the grinding disc can rotate under the driving of the driving device;
a plurality of grinding rollers connected by rocker arms to hydraulic rams of a respective one of a plurality of hydraulic loading and adjustment units in the hydraulic loading and adjustment system and located above the grinding disc; and
a mill control system including the hydraulic control system and in communication with the drive device to control the action of the grinding discs.
9. A roller mill according to claim 8, wherein the grinding rollers are connected to the piston rods of the hydraulic rams of each of the plurality of hydraulic loading and adjustment units by rocker arms.
10. A roller mill according to claim 8, wherein the pressure of the rodless chamber of the hydraulic ram in each of the hydraulic loading and conditioning systems is between 1.5mPa-3 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920842422.1U CN211755556U (en) | 2019-06-05 | 2019-06-05 | Hydraulic loading and adjusting system and roller mill using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920842422.1U CN211755556U (en) | 2019-06-05 | 2019-06-05 | Hydraulic loading and adjusting system and roller mill using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211755556U true CN211755556U (en) | 2020-10-27 |
Family
ID=72905955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920842422.1U Active CN211755556U (en) | 2019-06-05 | 2019-06-05 | Hydraulic loading and adjusting system and roller mill using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211755556U (en) |
-
2019
- 2019-06-05 CN CN201920842422.1U patent/CN211755556U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106870289B (en) | Hydrostatic energy storage type hydraulic drive wind generating set and control method | |
| KR20080007368A (en) | Die cushion device for press machine | |
| EP0017342B1 (en) | Roller mill and method of operation | |
| JP2634321B2 (en) | Cargo handling machinery | |
| CN103343789A (en) | Yaw brake of wind power generation device and controlling method thereof | |
| CN211755556U (en) | Hydraulic loading and adjusting system and roller mill using same | |
| CN105485166A (en) | Oil supplementing system for dynamic and static pressure bearing of grinding machine | |
| CN112044532A (en) | Roller mill with hydraulic loading and adjusting system | |
| CN214023511U (en) | Weight balancing device of precision machining center | |
| CN104944326A (en) | Hydraulic roll ascending system for grinding rolls of vertical mills | |
| CN205371114U (en) | Coal pulverizer hydraulic loading system | |
| CN103282676A (en) | Oil pressure system for wheel loader | |
| CN203196691U (en) | Roller type medium-speed mill | |
| CN109681481A (en) | Oil supply system, hydraulic control system and engineering machinery | |
| CN201412400Y (en) | Hydraulic control device of turnover mechanism and turnover mechanism | |
| CN108386397B (en) | Constant-pressure energy accumulator system | |
| US11814814B2 (en) | Hydraulic system for hydro-mechanical machines comprising rotary mechanism and boom cylinder | |
| CN113083440A (en) | Dynamic control and deviation-correcting hydraulic system for roller gap of high-pressure roller mill and control method | |
| CN206754017U (en) | A kind of energy-saving hydraulic pumping plant for TRT fast cut valves | |
| US11118604B2 (en) | Hydraulic system for hydro-mechanical machines comprising rotary mechanism | |
| CN112373621A (en) | Flexible energy-saving speed-limiting control system for free anchoring of large-scale anchor windlass | |
| CN104358995A (en) | Emergency oil supply hydraulic station for large-scale mill | |
| CN108591189B (en) | Variable-parameter energy accumulator control system and movable arm energy-saving hydraulic system | |
| CN219317291U (en) | Servo pump control hydraulic valve group structure | |
| CN217002462U (en) | Vertical mill loading hydraulic system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |