CN219985779U - Hydraulic system for leveling tear-proof roller in uncoiler - Google Patents
Hydraulic system for leveling tear-proof roller in uncoiler Download PDFInfo
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- CN219985779U CN219985779U CN202321457674.5U CN202321457674U CN219985779U CN 219985779 U CN219985779 U CN 219985779U CN 202321457674 U CN202321457674 U CN 202321457674U CN 219985779 U CN219985779 U CN 219985779U
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- 238000006073 displacement reaction Methods 0.000 claims description 14
- 230000004044 response Effects 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 33
- 239000010959 steel Substances 0.000 abstract description 33
- 239000003921 oil Substances 0.000 description 152
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 239000010720 hydraulic oil Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000001953 recrystallisation Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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Abstract
The utility model relates to a hydraulic system for leveling tear-proof rollers in an uncoiler, which comprises a hydraulic pump station, a proportional directional valve, an electromagnetic directional valve, a proportional pressure reducing valve and a hydraulic cylinder. The end part of a piston rod of the hydraulic cylinder is fixedly connected with the anti-tearing roller, the hydraulic pump station is respectively connected with a rodless cavity and a rod cavity of the hydraulic cylinder through an oil supply pipe and an oil return pipe, and the proportional direction valve is connected with the oil supply pipe and the oil return pipe and can control the extension or retraction of the piston rod. The electromagnetic reversing valve is arranged between the hydraulic cylinder and the proportional direction valve, is connected with the oil supply pipe and the oil return pipe, and can control the oil supply pipe and the oil return pipe to be simultaneously connected or disconnected. The proportional pressure reducing valve is connected in series on the oil supply pipe and is positioned between the hydraulic cylinder and the electromagnetic reversing valve, and a pressure sensor or a pressure relay is connected to the oil supply pipe and is close to the rodless cavity. The hydraulic system can be matched with the anti-tearing roller to prevent strip steel from being torn caused by strip steel shaking.
Description
Technical Field
The utility model relates to the field of cold-rolled strip steel production, in particular to a hydraulic system for a tearing-preventing roller in a leveling uncoiler.
Background
In the production of cold-rolled strip steel, a single-frame four-roller leveling unit levels a steel coil subjected to cold rolling and annealing to improve the mechanical property of the strip steel, improve the surface quality, flatness and surface roughness of the strip steel. The bell-type furnace carries out recrystallization annealing to the coil of strip, when the coil of strip in the stove begins to cool down, because the outer cooling rate of coil of strip is faster, and the relatively poor cooling of inlayer heat dissipation is slower, like this the inside and outside temperature difference of coil of strip can produce very high radial pressure, can produce the bonding between the coil of strip layer. When the strip steel is flatly uncoiled, the strip steel is adhered to cause the phenomenon of tearing or cracking of the strip steel. The anti-tearing roller is arranged at the outlet of the uncoiler, and the stress state of the strip steel is optimized by adjusting the position or the pressure of the roller, so that the strip steel is prevented from being torn caused by strip steel jitter. In order to realize the action of the machine, a brand new hydraulic control system matched with the machine is required to be designed.
The present inventors have therefore, through years of experience and practice in the relevant industry, proposed a hydraulic system for levelling the tear-resistant roller in an unwinder, to overcome the drawbacks of the prior art.
Disclosure of Invention
The utility model aims to provide a hydraulic system for leveling a tearing-proof roller in an uncoiler, which can be matched with the tearing-proof roller for use and can prevent strip steel from tearing caused by strip steel shaking.
The utility model aims at realizing the hydraulic system for leveling the tearing-proof roller in the uncoiler, which comprises a hydraulic pump station, a proportional directional valve, an electromagnetic directional valve, a proportional pressure reducing valve and a hydraulic cylinder; the end part of a piston rod of the hydraulic cylinder is fixedly connected with the anti-tearing roller, the hydraulic pump station is respectively connected with a rodless cavity and a rod cavity of the hydraulic cylinder through an oil supply pipe and an oil return pipe, and the proportional direction valve is connected with the oil supply pipe and the oil return pipe and can control the extension or retraction of the piston rod; the electromagnetic reversing valve is arranged between the hydraulic cylinder and the proportional directional valve, is connected with the oil supply pipe and the oil return pipe, and can control the oil supply pipe and the oil return pipe to be simultaneously a passage or cut off simultaneously; the proportional pressure reducing valve is connected in series on the oil supply pipe and is positioned between the hydraulic cylinder and the electromagnetic reversing valve, and a pressure sensor or a pressure relay is connected to the oil supply pipe and is close to the rodless cavity.
In a preferred embodiment of the utility model, a displacement sensor is mounted on the rodless cavity.
In a preferred embodiment of the present utility model, the proportional directional valve is a three-position four-way valve and has a first pressure oil port, a first oil return port, a first working oil port and a second working oil port, wherein the first pressure oil port and the first working oil port are both connected in series on the oil supply pipe and the first working oil port is arranged close to the electromagnetic directional valve, the first oil return port and the second working oil port are both connected in series on the oil return pipe and the second working oil port is arranged close to the electromagnetic directional valve.
In a preferred embodiment of the present utility model, the proportional directional valve is a high frequency response proportional valve or a proportional servo valve.
In a preferred embodiment of the present utility model, the electromagnetic directional valve includes four execution oil ports, wherein two execution oil ports are connected in series to the oil supply pipe, and the other two execution oil ports are connected in series to the oil return pipe.
In a preferred embodiment of the present utility model, the electromagnetic directional valve is an electromagnetic ball valve.
In a preferred embodiment of the utility model, a first manual valve is arranged on the oil supply pipe and between the rodless cavity and the proportional pressure reducing valve, and a second manual valve is arranged on the oil return pipe and between the rod cavity and the electromagnetic directional valve.
In a preferred embodiment of the utility model, a first pressure measuring joint is connected to the oil supply pipe and between the rodless cavity and the proportional pressure reducing valve, and a second pressure measuring joint is connected to the oil return pipe and between the rod cavity and the electromagnetic directional valve.
In a preferred embodiment of the utility model, the hydraulic pump station comprises a hydraulic pump set and an oil tank, wherein the oil supply pipe and the oil return pipe are connected with the oil tank, and the hydraulic pump set is arranged on the oil supply pipe.
In a preferred embodiment of the utility model, a one-way valve is provided on the return line and close to the hydraulic pump station.
Therefore, the hydraulic system can be matched with the anti-tearing roller, the piston rod of the hydraulic cylinder can reach the preset position by utilizing the proportional directional valve, the pressure of the rodless cavity is detected in real time by the pressure sensor, and the pressure of the rodless cavity is regulated by the proportional pressure reducing valve, so that the force closed-loop control of the anti-tearing roller is realized, the constant pressure of the anti-tearing roller applied to the strip steel is effectively ensured, and the strip steel tearing caused by strip steel shaking is further effectively prevented.
Drawings
The following drawings are only for purposes of illustration and explanation of the present utility model and are not intended to limit the scope of the utility model. Wherein:
fig. 1: the hydraulic system for leveling the tearing-proof roller in the uncoiler is provided with a structural schematic diagram.
Reference numerals illustrate:
1. a hydraulic pump station; 11. a hydraulic pump unit; 12. an oil tank; 13. an oil supply pipe; 131. a pressure sensor; 132. a first manual valve; 133. a first pressure tap; 14. an oil return pipe; 141. a second manual valve; 142. a second pressure tap; 143. a one-way valve;
2. a proportional directional valve; p3, a first pressure oil port; t1, a first oil return port; a1, a first working oil port; b1, a second working oil port;
3. an electromagnetic reversing valve; c1, a first execution oil port; c2, a second execution oil port; c3, a third execution oil port; c4, a fourth execution oil port;
4. a proportional pressure reducing valve; p4, a second pressure oil port; t2, a second oil return port; a2, a third working oil port;
5. a hydraulic cylinder; 51. a rodless cavity; 511. a displacement sensor; 52. there is a rod cavity.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present utility model, a specific embodiment of the present utility model will be described with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides a hydraulic system for leveling tear-proof rollers in an uncoiler, which comprises a hydraulic pump station 1, a proportional directional valve 2, an electromagnetic directional valve 3, a proportional pressure reducing valve 4 and a hydraulic cylinder 5; the end part of a piston rod of the hydraulic cylinder 5 is fixedly connected with the anti-tearing roller, the hydraulic pump station 1 is respectively connected with a rodless cavity 51 and a rod cavity 52 of the hydraulic cylinder 5 through an oil supply pipe 13 and an oil return pipe 14, and the proportional directional valve 2 is connected with the oil supply pipe 13 and the oil return pipe 14 and can control the extension or retraction of the piston rod; the electromagnetic directional valve 3 is positioned between the hydraulic cylinder 5 and the proportional directional valve 2, is connected with the oil supply pipe 13 and the oil return pipe 14, and can control the oil supply pipe 13 and the oil return pipe 14 to be simultaneously a passage or simultaneously cut off; the proportional pressure reducing valve 4 is connected in series with the oil supply pipe 13 and is positioned between the hydraulic cylinder 5 and the electromagnetic directional valve 3, and a pressure sensor 131 or a pressure relay is connected on the oil supply pipe 13 and near the rodless cavity 51 (namely positioned between the hydraulic cylinder 5 and the proportional pressure reducing valve 4) and is used for feeding back the pressure of the rodless cavity 51 of the hydraulic cylinder 5 in real time.
The hydraulic pump station 1 gives the pressure P1 of the rodless cavity 51 through the oil supply pipe 13, overcomes the friction force of the hydraulic cylinder 5 and the pressure P2 of the rod cavity 52 of the hydraulic valve (the hydraulic valve here includes the proportional directional valve 2, the electromagnetic directional valve 3 and the proportional pressure reducing valve 4) and the pressure loss of the pipeline, and the pressure P2 of the rod cavity 52 is the back pressure. The area of the rodless chamber 51 is A1, the area of the rod-shaped chamber 52 is A2, the force F1 of the rodless chamber 51 is p1×a1, and the force F2 of the rod-shaped chamber 52 is p2×a2. The sum of F1 and the dead weight G of the movable part of the tearing-proof roller is subtracted, and the resultant force F formed by the sum of F2 and the action friction force F of the tearing-proof roller is acted on the strip steel. The resultant force F changes along with the specification of the strip steel, and for a strip steel with a certain specification, the resultant force is kept to be a constant value in the rolling process, so that the follow-up of the anti-tearing roller and the strip steel can be realized.
The resultant force exerted by the anti-tearing roll on the strip steel can be adjusted by the hydraulic system so as to keep the resultant force value constant. Specifically, when in use, the piston rod of the hydraulic cylinder 5 is fixed with the anti-tearing roller. The electromagnetic directional valve 3 has a communication working position and a cutting working position, and in normal rolling, the electromagnetic directional valve 3 is in the communication working position, and the oil supply pipe 13 and the oil return pipe 14 are both passages; in an emergency, the electromagnetic directional valve 3 is in the shut-off position, and the oil supply pipe 13 and the oil return pipe 14 are both shut off to shut off the hydraulic oil. After the strip steel is worn, the piston rod of the hydraulic cylinder 5 is controlled to extend to a preset position through the proportional directional valve 2, the pressure sensor 131 can feed back the pressure P1 of the rodless cavity 51 in real time, and a signal is transmitted to a corresponding controller (PLC), and the pressure F of the anti-tearing roller is calculated by the controller; after the value is compared with the target value of the tearing-preventing roller pressure F, a command signal of the difference value is sent to the proportional pressure reducing valve 4, and the pressure P1 of the rodless cavity 51 is regulated through the proportional pressure reducing valve 4 so as to ensure the pressure stability of the rodless cavity 51, further ensure the constancy of the resultant force F and realize the force closed loop.
Therefore, the hydraulic system can be matched with the anti-tearing roller, the piston rod of the hydraulic cylinder 5 can reach the preset position by utilizing the proportional directional valve 2, the pressure of the rodless cavity 51 is detected in real time by the pressure sensor 131, the pressure of the rodless cavity 51 is regulated by the proportional pressure reducing valve 4, the force closed-loop control of the anti-tearing roller is realized, the constant pressure of the anti-tearing roller applied on the strip steel is effectively ensured, and the strip steel tearing caused by strip steel shaking is further effectively prevented.
In a specific implementation, the rodless cavity 51 has a displacement sensor 511 mounted thereon.
The proportional direction valve 2 can adjust the quantity of oil entering the rodless cavity 51, when the oil in the rodless cavity 51 needs to be added, the proportional direction valve 2 is in a first working position (right position), pressure oil in the hydraulic pump station 1 enters the proportional direction valve 2 through the oil supply pipe 13, enters the rodless cavity 51 after passing through a left side passage of the electromagnetic directional valve 3 and the proportional pressure reducing valve 4, and can enable a piston rod of the hydraulic cylinder 5 to extend; meanwhile, oil in the rod cavity 52 returns to the hydraulic pump station 1 through a right side passage of the electromagnetic directional valve 3, the proportional directional valve 2 and the oil return pipe 14. When the oil in the rodless cavity 51 needs to be reduced, the proportional directional valve 2 is in a second working position (left position), and pressure oil enters the proportional directional valve 2 through the oil supply pipe 13 and enters the rod cavity 52 after passing through the right passage of the electromagnetic directional valve 3, so that the piston rod of the hydraulic cylinder 5 is retracted; meanwhile, oil in the rodless cavity 51 returns to the hydraulic pump station 1 through the proportional pressure reducing valve 4, the left side passage of the electromagnetic directional valve 3, the proportional directional valve 2 and the oil return pipe 14.
The displacement sensor 511 may actually measure the position of the hydraulic cylinder 5 and transmit a signal to the controller, and after comparing the value with a target value of displacement, a command signal of a difference is transmitted to the proportional directional valve 2, so as to ensure that the position of the hydraulic cylinder 5 is constant, and realize a position closed loop.
More specifically, the proportional directional valve 2 is a three-position four-way valve and has a first pressure oil port P3, a first oil return port T1, a first working oil port A1 and a second working oil port B1, where the first pressure oil port P3 and the first working oil port A1 are both connected in series on the oil supply pipe 13 and the first working oil port A1 is disposed near the electromagnetic directional valve 3 (the first pressure oil port P3 is disposed near the hydraulic pump station 1), the first oil return port T1 and the second working oil port B1 are both connected in series on the oil return pipe 14 and the second working oil port B1 is disposed near the electromagnetic directional valve 3.
The proportional directional valve 2 has a normal position (i.e., a middle position shown in fig. 1), the first working position (i.e., a right position shown in fig. 1), and the second working position (i.e., a left position shown in fig. 1), and the proportional directional valve 2 is in the normal position when power is lost, at this time, the first pressure oil port P3 is closed, and the first working oil port A1 and the second working oil port B1 are both communicated with the first oil return port T1. When the proportional directional valve 2 is powered to be in the first working position, the first pressure oil port P3 is communicated with the first working oil port A1, so that pressure oil can enter the rodless cavity 51, and the second working oil port B1 is communicated with the first oil return port T1, so that oil in the rod cavity 52 returns through the first oil return port T1. When the proportional directional valve 2 is powered to be in the second working position, the first pressure oil port P3 is communicated with the second working oil port B1, so that pressure oil can enter the rod cavity 52, and the first working oil port A1 is communicated with the first oil return port T1, so that oil in the rodless cavity 51 can return through the first oil return port T1.
For the above-mentioned proportional directional valve 2, a normal proportional directional valve may be adopted, and more preferably, a high-frequency response proportional valve or a proportional servo valve is adopted, the precision of the high-frequency response proportional valve is higher, and the response speed and the precision of the proportional servo valve are higher. The common proportional directional valve, the high-frequency response proportional valve and the proportional servo valve are all of the existing structure and are not described herein.
Further, the electromagnetic directional valve 3 includes four execution oil ports, wherein two execution oil ports are connected in series to the oil supply pipe 13, and the other two execution oil ports are connected in series to the oil return pipe 14.
Referring to fig. 1, the four execution ports are respectively denoted as a first execution port C1, a second execution port C2, a third execution port C3, and a fourth execution port C4, the first execution port C1 and the third execution port C3 are connected in series on the oil supply pipe 13, the first execution port C1 is close to the proportional directional valve 2, and the third execution port C3 is close to the proportional pressure reducing valve 4; the second execution oil port C2 and the fourth execution oil port C4 are connected in series on the oil return pipe 14, the second execution oil port C2 is close to the proportional directional valve 2, and the fourth execution oil port C4 is close to the rod cavity 52. When the electromagnetic directional valve 3 is in a communication working position (namely, the right position shown in fig. 1), the first execution oil port C1 is communicated with the third execution oil port C3, and the second execution oil port C2 is communicated with the fourth execution oil port C4, so that a passage of the oil supply pipe 13 and the oil return pipe 14 is realized; when the electromagnetic directional valve 3 is in the cut-off working position (i.e., the left position shown in fig. 1), the first execution port C1 and the third execution port C3 are disconnected, and the second execution port C2 and the fourth execution port C4 are disconnected, so as to realize disconnection of the oil supply pipe 13 and the oil return pipe 14.
The electromagnetic directional valve 3 can be an electromagnetic ball valve, of course, other types of electromagnetic directional valves 3 which can realize the functions can be adopted as required, and the structures of the electromagnetic ball valve and the electromagnetic directional valve 3 are all existing structures, and are not described herein.
Referring to fig. 1, the proportional pressure reducing valve 4 has a second pressure oil port P4, a second oil return port T2, and a third working oil port A2, where the second pressure oil port P4 and the third working oil port A2 are both connected in series on the oil supply pipe 13, and the second pressure oil port P4 is disposed near the electromagnetic directional valve 3, and the second oil return port T2 is connected on the oil return pipe 14 by a corresponding pipe to implement oil return. The specific structure of the proportional pressure reducing valve 4 is an existing structure, and will not be described here again.
Further, a first manual valve 132 is provided on the oil feed pipe 13 between the rodless chamber 51 and the proportional pressure reducing valve 4, and a second manual valve 141 is provided on the oil return pipe 14 between the rod chamber 52 and the electromagnetic directional valve 3.
During normal production, both the first manual valve 132 and the second manual valve 141 are open; when maintenance work is required, the first manual valve 132 and the second manual valve 141 are closed, so that the operator can maintain the maintenance work conveniently.
In order to facilitate the detection of the pressure of the pipeline during maintenance, a first pressure measuring joint 133 is connected to the oil supply pipe 13 and between the rodless cavity 51 and the proportional pressure reducing valve 4, and a second pressure measuring joint 142 is connected to the oil return pipe 14 and between the rod cavity 52 and the electromagnetic directional valve 3. The first pressure measuring joint 133 is arranged between the proportional pressure reducing valve 4 and the first manual valve 132, and the second pressure measuring joint 142 is arranged between the electromagnetic directional valve 3 and the second manual valve 141; in use, the first and second pressure taps 133, 142 may be fitted with corresponding pressure gauges, such as pressure gauges, to facilitate the detection of pressure at that location.
Further, the hydraulic pump station 1 comprises a hydraulic pump set 11 and an oil tank 12, an oil supply pipe 13 and an oil return pipe 14 are connected with the oil tank 12, and the hydraulic pump set 11 is arranged on the oil supply pipe 13. The whole hydraulic pump station 1 is a power source and comprises an oil tank 12, accessories thereof, a hydraulic pump set 11 and the like, and the specific structure of the hydraulic pump station 1 is the prior art and is not repeated here.
A check valve 143 is typically provided on the return line 14 near the hydraulic pump station 1. The check valve 143 is located between the proportional directional valve 2 and the oil tank 12, and prevents the oil from flowing backward from the oil tank 12.
The whole hydraulic system can realize double closed-loop control of the position and force of the anti-tearing roller, and can independently put into force closed-loop during rolling, can independently put into position closed-loop, and can also put into two closed-loop cooperation. The specific three control modes can be selected according to actual needs, and the working principles are as follows:
(1) Closed loop of independent input force: in this way the displacement sensor 511 is not active
When the hydraulic control device works, after strip steel is worn, a pressure target value is given through the proportional pressure reducing valve 4, the proportional direction valve 2 is electrified to be in a first working position, oil liquid entering the rodless cavity 51 of the hydraulic cylinder 5 is regulated through the proportional direction valve 2 until data detected by the pressure sensor 131 reach the pressure target value, and the hydraulic rod of the hydraulic cylinder 5 keeps a position at the position;
the pressure sensor 131 is used for detecting the pressure P1 of the rodless cavity 51 in real time, the pressure P1 is compared with a pressure target value, and the proportional pressure reducing valve 4 is controlled to adjust the pressure P1 of the rodless cavity 51 according to the difference value until the pressure target value is reached, and the force applied by the hydraulic rod is ensured to be constant through a force closed loop.
In the whole adjusting process, if the measured value P1 of the pressure sensor 131 is larger than the pressure target value, the proportional directional valve 2 is powered on and is in the second working position; if the measured value P1 of the pressure sensor 131 is smaller than the pressure target value, the proportional directional valve 2 is powered to be in the first working position; the electromagnetic ball valve is always in the communication working position. Under the emergency condition of the strip steel, the proportional direction valve 2 is in a normal position, the electromagnetic ball valve is electrified to be in a cutting-off working position, at the moment, hydraulic oil does not enter the hydraulic cylinder 5, and the hydraulic cylinder 5 is kept motionless.
(2) Closed loop of single input position: in this way the pressure sensor 131 is deactivated
When the hydraulic cylinder is in operation, after the strip steel is worn, a position target value is given, the proportional direction valve 2 is electrified to be in a first working position, oil liquid entering the rodless cavity 51 of the hydraulic cylinder 5 is regulated by the proportional direction valve 2 until the data detected by the displacement sensor 511 reach the position target value, and the hydraulic rod of the hydraulic cylinder 5 is kept at the position;
the position of the hydraulic cylinder 5 is detected in real time by using the displacement sensor 511, the position is compared with a displacement target value, and the proportional direction valve 2 is controlled to adjust (specifically, the proportional direction valve 2 is powered to be in a first working position, the displacement of the hydraulic cylinder 5 is increased, or the proportional direction valve 2 is powered to be in a second working position, the displacement of the hydraulic cylinder 5 is reduced) according to the difference value until the current position of the hydraulic cylinder 5 reaches the position target value, and the position of the hydraulic rod is ensured to be constant through a position closed loop.
The whole adjusting process is used for adjusting the proportional direction valve 2 to be in a first working position or in a second working position according to the requirement, and the electromagnetic ball valve is always in a communicating working position. Under the emergency condition of the strip steel, the proportional direction valve 2 is in a normal position, the electromagnetic ball valve 05 is powered on and is in a cutting-off working position, at the moment, hydraulic oil does not enter the hydraulic cylinder 5, and the hydraulic cylinder 5 is kept motionless.
(3) Force closed loop and position closed loop cooperate and input simultaneously: the position closed loop is put into use firstly, and after the hydraulic cylinder 5 reaches the set position, the position closed loop is closed, and the force closed loop is put into use
When the hydraulic cylinder is in operation, after the strip steel is worn, a position target value is given, the proportional direction valve 2 is electrified to be in a first working position, oil liquid entering the rodless cavity 51 of the hydraulic cylinder 5 is regulated by the proportional direction valve 2 until the data detected by the displacement sensor 511 reach the position target value, and the hydraulic rod of the hydraulic cylinder 5 is kept at the position;
then, a pressure target value is given through the proportional pressure reducing valve 4, the pressure sensor 131 is used for detecting the pressure P1 of the rodless cavity 51 in real time, the pressure P1 is compared with the pressure target value, the proportional pressure reducing valve 4 is controlled to adjust the pressure P1 of the rodless cavity 51 according to the difference value until the pressure P1 reaches the pressure target value, and the constant force applied by the hydraulic rod is ensured through a force closed loop.
In the whole adjusting process, if the actually measured displacement value is larger than the position target value or the actually measured pressure value is larger than the pressure target value, the proportional directional valve 2 is powered on to be in a second working position, otherwise, the power is powered on to be in a first working position; the electromagnetic ball valve is always in the communication working position. Under the emergency condition of the strip steel, the proportional direction valve 2 is in a normal position, the electromagnetic ball valve is electrified to be in a cutting-off working position, at the moment, hydraulic oil does not enter the hydraulic cylinder 5, and the hydraulic cylinder 5 is kept motionless.
The foregoing is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this utility model, and are intended to be within the scope of this utility model.
Claims (10)
1. The hydraulic system for leveling the tearing-proof roller in the uncoiler is characterized by comprising a hydraulic pump station, a proportional directional valve, an electromagnetic directional valve, a proportional pressure reducing valve and a hydraulic cylinder;
the end part of a piston rod of the hydraulic cylinder is fixedly connected with the anti-tearing roller, the hydraulic pump station is respectively connected with a rodless cavity and a rod cavity of the hydraulic cylinder through an oil supply pipe and an oil return pipe, and the proportional direction valve is connected with the oil supply pipe and the oil return pipe and can control the extension or retraction of the piston rod; the electromagnetic reversing valve is positioned between the hydraulic cylinder and the proportional direction valve, is connected with the oil supply pipe and the oil return pipe, and can control the oil supply pipe and the oil return pipe to be simultaneously in a passage or be simultaneously cut off; the proportional pressure reducing valve is connected in series to the oil supply pipe and is positioned between the hydraulic cylinder and the electromagnetic reversing valve, and a pressure sensor or a pressure relay is connected to the oil supply pipe and is close to the rodless cavity.
2. A hydraulic system for levelling a tear-resistant roll in an unwinder as claimed in claim 1,
and a displacement sensor is arranged on the rodless cavity.
3. A hydraulic system for levelling a tear-resistant roll in an unwinder as claimed in claim 1,
the proportional direction valve is a three-position four-way valve and is provided with a first pressure oil port, a first oil return port, a first working oil port and a second working oil port, wherein the first pressure oil port and the first working oil port are connected in series on the oil supply pipe and close to the electromagnetic directional valve, and the first oil return port and the second working oil port are connected in series on the oil return pipe and close to the electromagnetic directional valve.
4. A hydraulic system for levelling a tear-resistant roll in an unwinder as claimed in claim 1,
the proportional direction valve is a high-frequency response proportional valve or a proportional servo valve.
5. A hydraulic system for levelling a tear-resistant roll in an unwinder as claimed in claim 1,
the electromagnetic reversing valve comprises four execution oil ports, wherein two execution oil ports are connected in series on the oil supply pipe, and the other two execution oil ports are connected in series on the oil return pipe.
6. A hydraulic system for levelling a tear-resistant roll in an unwinder as claimed in claim 1,
the electromagnetic reversing valve is an electromagnetic ball valve.
7. A hydraulic system for levelling a tear-resistant roll in an unwinder as claimed in claim 1,
the oil supply pipe is provided with a first manual valve which is positioned between the rodless cavity and the proportional pressure reducing valve, and the oil return pipe is provided with a second manual valve which is positioned between the rod cavity and the electromagnetic reversing valve.
8. A hydraulic system for levelling a tear-resistant roll in an unwinder as claimed in claim 1,
the oil supply pipe is connected with a first pressure measuring joint which is positioned between the rodless cavity and the proportional pressure reducing valve, and the oil return pipe is connected with a second pressure measuring joint which is positioned between the rod cavity and the electromagnetic reversing valve.
9. A hydraulic system for levelling a tear-resistant roll in an unwinder as claimed in claim 1,
the hydraulic pump station comprises a hydraulic pump set and an oil tank, wherein the oil supply pipe and the oil return pipe are connected with the oil tank, and the hydraulic pump set is arranged on the oil supply pipe.
10. A hydraulic system for levelling a tear-resistant roll in an unwinder as claimed in claim 1,
and a one-way valve is arranged on the oil return pipe and close to the hydraulic pump station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321457674.5U CN219985779U (en) | 2023-06-08 | 2023-06-08 | Hydraulic system for leveling tear-proof roller in uncoiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321457674.5U CN219985779U (en) | 2023-06-08 | 2023-06-08 | Hydraulic system for leveling tear-proof roller in uncoiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219985779U true CN219985779U (en) | 2023-11-10 |
Family
ID=88620623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321457674.5U Active CN219985779U (en) | 2023-06-08 | 2023-06-08 | Hydraulic system for leveling tear-proof roller in uncoiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219985779U (en) |
-
2023
- 2023-06-08 CN CN202321457674.5U patent/CN219985779U/en active Active
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