CN216788842U - Hydraulic system valve table of rewinding and unwinding trolley - Google Patents
Hydraulic system valve table of rewinding and unwinding trolley Download PDFInfo
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- CN216788842U CN216788842U CN202220410743.6U CN202220410743U CN216788842U CN 216788842 U CN216788842 U CN 216788842U CN 202220410743 U CN202220410743 U CN 202220410743U CN 216788842 U CN216788842 U CN 216788842U
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Abstract
The utility model discloses a valve stand of a hydraulic system of a rewinding and coil discharging trolley, which belongs to the technical field of steel making equipment and comprises a pressure oil pipe and a lifting oil cylinder arranged at the bottom of the rewinding and coil discharging trolley, wherein a proportional reversing valve and a balance valve are sequentially arranged between the pressure oil pipe and a rodless cavity of the lifting oil cylinder, and a rod cavity of the lifting oil cylinder is connected with an oil return pipe through the proportional reversing valve; a pilot type pressure reducing valve controlled by an electromagnetic directional valve is arranged between the pressure oil pipe and the proportional directional valve, the control end of the pilot type pressure reducing valve is connected with a working oil port of the electromagnetic directional valve, an outer pilot oil port of the electromagnetic directional valve is connected with the pressure oil pipe, and an outer oil leakage port of the electromagnetic directional valve is connected with an oil leakage pipe. The utility model can solve the problem that the steel coil is difficult to unload because the upward acting force of the lifting oil cylinder is too large when the coil is connected and the saddle of the trolley at the top of the lifting oil cylinder is propped against the bottom of the winding drum of the coiling machine.
Description
Technical Field
The utility model relates to the technical field of steel-making equipment, in particular to a hydraulic system valve table for a rewinding and uncoiling trolley.
Background
In the production process of the rewinding straightening and withdrawal unit of the steel cold rolling plant, a coil stripping trolley controlled by a valve table of a hydraulic system of the rewinding coil stripping trolley is used for parallelly moving out a horizontally lying steel coil sleeved in a winding drum of a coiling machine along the horizontal direction of a core wire of a winding drum shaft and unloading the steel coil on a fixed saddle. A valve stand of a hydraulic system of a recoiling and coil unloading trolley comprises a pressure oil pipe and a lifting oil cylinder arranged at the bottom of the coil unloading trolley, wherein a proportional reversing valve and a balance valve are sequentially arranged on a main oil path between the pressure oil pipe and a rodless cavity of the lifting oil cylinder, and a rod cavity of the lifting oil cylinder is connected with an oil return pipe through the proportional reversing valve. When in coil unloading, the proportional reversing valve is firstly controlled to reverse, pressure oil enters the rodless cavity of the lifting oil cylinder to enable the lifting oil cylinder to drive the coil unloading trolley to ascend to the bottom of a winding drum of a coiling machine to receive coils, however, when the valve platform of the hydraulic system of the heavy coil unloading trolley is in practical application, the upward acting force of the lifting oil cylinder is too large when coils are connected, a trolley saddle at the top of the lifting oil cylinder is enabled to be propped against the bottom of the winding drum, after the diameter of the winding drum is reduced, the inner ring of a steel coil is still clung to the winding drum, the situation that the steel coil is difficult to unload out when the coil is drawn out is caused, the production efficiency is seriously influenced, and the damage of equipment can be caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a valve stand of a hydraulic system of a heavy coil stripping trolley, which can solve the problem that a steel coil is difficult to discharge because a trolley saddle at the top of the valve stand abuts against the bottom of a winding drum of a coiling machine due to overlarge upward acting force of a lifting oil cylinder during coil splicing.
In order to solve the problems, the technical scheme adopted by the utility model is as follows: the valve stand of the hydraulic system of the rewinding and unwinding trolley comprises a pressure oil pipe and a lifting oil cylinder arranged at the bottom of the rewinding and unwinding trolley, wherein a proportional reversing valve and a balance valve are sequentially arranged on a main oil path between the pressure oil pipe and a rodless cavity of the lifting oil cylinder, and a rod cavity of the lifting oil cylinder is connected with an oil return pipe through the proportional reversing valve; a pilot-operated pressure reducing valve controlled by an electromagnetic directional valve is arranged between the pressure oil pipe and the proportional directional valve, the control end of the pilot-operated pressure reducing valve is connected with a working oil port of the electromagnetic directional valve, an outer pilot oil port of the electromagnetic directional valve is connected with the pressure oil pipe, and an outer oil leakage port of the electromagnetic directional valve is connected with an oil leakage pipe.
In the above technical solution, a more specific technical solution may also be: and a pressure reducing valve is connected between the rod cavity of the lifting oil cylinder and the proportional reversing valve, and the control end of the pressure reducing valve is connected with the leakage oil pipe.
Further: and an overflow valve is arranged between the oil outlet of the balance valve and the oil return pipe.
Further: and a one-way valve is arranged between the oil return port of the proportional reversing valve and the oil return pipe.
Further: a first ball valve is arranged between the rodless cavity of the lifting oil cylinder and the balance valve; and a second ball valve is arranged between the rod cavity of the lifting oil cylinder and the pressure reducing valve.
Further: and the control end of the balance valve is connected to the oil return pipe between the second ball valve and the pressure reducing valve.
Further: the proportional reversing valve is a three-position four-way proportional reversing valve.
Due to the adoption of the technical scheme, compared with the prior art, the utility model has the following beneficial effects:
due to the structure of the valve platform of the hydraulic system of the heavy coil stripping trolley, when a coil is picked up, the proportional reversing valve is controlled to work at the left position, the stop valve and the first ball valve are communicated, pressure oil sequentially passes through the stop valve, the pilot type pressure reducing valve, the proportional reversing valve, the balance valve and the first ball valve and enters the rodless cavity of the lifting oil cylinder to enable the piston of the lifting oil cylinder to extend out to drive the coil stripping trolley to ascend, when the coil stripping trolley is about to reach the bottom of a steel coil, the electromagnetic reversing valve is controlled to work at the right position in a reversing manner, at the moment, the valve opening degree of the pilot type pressure reducing valve is controlled to be increased by the pressure in the leakage oil pipe, the pressure of a main oil way is reduced, and therefore the coil stripping trolley is controlled to slowly reach the bottom of the steel coil to pick up the coil; the situation that the trolley saddle at the top of the lifting oil cylinder is propped against the bottom of the winding drum of the coiling machine due to overlarge acting force of the lifting oil cylinder during coil receiving is avoided, a coil core drawing phenomenon is avoided, reliable coil unloading of a steel coil is guaranteed, and equipment damage is avoided.
Drawings
FIG. 1 is a hydraulic schematic of an embodiment of the present invention.
Detailed Description
The utility model will be further described in detail with reference to the following examples:
the valve stand of the hydraulic system of the rewinding and uncoiling trolley shown in fig. 1 comprises a pressure oil pipe 1, an oil return pipe 2, a leakage oil pipe 3 and a lifting oil cylinder 4, wherein the lifting oil cylinder 4 is arranged at the bottom of the uncoiling trolley and used for driving the coil uncoiling trolley to ascend and descend for coil receiving and coil unloading; a stop valve 5, a pilot type pressure reducing valve 6, a proportional reversing valve 7, a balance valve 8 and a first ball valve 9 are sequentially arranged on a main oil path between the pressure oil pipe 1 and a rodless cavity of the lifting oil cylinder 4; the control end of the pilot-operated reducing valve 6 is connected with a working oil port of the electromagnetic directional valve 10, an outer pilot oil port X of the electromagnetic directional valve 10 is connected to the pressure oil pipe 1 between the stop valve 5 and the pilot-operated reducing valve 6, an outer oil outlet Y of the electromagnetic directional valve 10 is connected with the oil leakage pipe 3, the electromagnetic directional valve 10 controls the valve opening of the pilot-operated reducing valve 6, and the function of controlling a loop to perform high-low pressure switching so as to enable the coil stripping trolley to quickly or slowly rise and fall is achieved; the proportional reversing valve 7 is a three-position four-way proportional reversing valve; a rod cavity of the lifting oil cylinder 4 is connected with the oil return pipe 2 sequentially through a second ball valve 11, a pressure reducing valve 12, a proportional reversing valve 7 and a one-way valve 13; the control end of the pressure reducing valve 12 is connected with the leakage oil pipe 3, and the pressure reducing valve plays a role in slowing down the descending speed of the coil stripping trolley after the coil stripping trolley is connected with coils so as to ensure the descending safety of the coil stripping trolley; an overflow valve 14 is arranged between the oil outlet of the balance valve 8 and the oil return pipe 2; the control end of the balancing valve 8 is connected to the return line 2 between the second ball valve 11 and the pressure reducing valve 12.
When receiving coils, controlling the proportional reversing valve 7 to work at the left position, communicating the stop valve 5 and the first ball valve 9, enabling pressure oil to enter a rodless cavity of the lifting oil cylinder 4 through the stop valve 5, the pilot-operated reducing valve 6, the proportional reversing valve 7, the balance valve 8 and the first ball valve 9 in sequence to enable a piston of the lifting oil cylinder 4 to extend out to drive the coil stripping trolley to ascend, controlling the electromagnetic reversing valve 10 to work at the right position in a reversing manner when the coil stripping trolley is about to reach the bottom of a steel coil, controlling the valve opening degree of the pilot-operated reducing valve 6 to be increased by the pressure in the leakage oil pipe at the moment, and reducing the pressure of a main oil way, so that the coil stripping trolley is controlled to slowly reach the bottom of the steel coil to receive the coils; the situation that the trolley saddle at the top of the lifting oil cylinder is propped against the bottom of the winding drum of the coiling machine due to overlarge acting force of the lifting oil cylinder during coil receiving is avoided, a coil core drawing phenomenon is avoided, reliable coil unloading of a steel coil is guaranteed, and equipment damage is avoided.
Claims (7)
1. A valve stand of a hydraulic system of a rewinding and unwinding trolley comprises a pressure oil pipe and a lifting oil cylinder arranged at the bottom of the unwinding trolley, wherein a proportional reversing valve and a balance valve are sequentially arranged on a main oil path between the pressure oil pipe and a rodless cavity of the lifting oil cylinder, and a rod cavity of the lifting oil cylinder is connected with an oil return pipe through the proportional reversing valve; the method is characterized in that: a pilot-operated pressure reducing valve controlled by an electromagnetic directional valve is arranged between the pressure oil pipe and the proportional directional valve, the control end of the pilot-operated pressure reducing valve is connected with a working oil port of the electromagnetic directional valve, an outer pilot oil port of the electromagnetic directional valve is connected with the pressure oil pipe, and an outer oil leakage port of the electromagnetic directional valve is connected with an oil leakage pipe.
2. The rewinding and unwinding trolley hydraulic system valve station according to claim 1, characterized in that: and a pressure reducing valve is connected between the rod cavity of the lifting oil cylinder and the proportional reversing valve, and the control end of the pressure reducing valve is connected with the leakage oil pipe.
3. The rewinding and unwinding trolley hydraulic system valve station according to claim 2, characterized in that: and an overflow valve is arranged between the oil outlet of the balance valve and the oil return pipe.
4. The rewinding and unwinding trolley hydraulic system valve station according to claim 2 or 3, characterized in that: and a one-way valve is arranged between the oil return port of the proportional reversing valve and the oil return pipe.
5. The rewinding and unwinding trolley hydraulic system valve station according to claim 4, characterized in that: a first ball valve is arranged between the rodless cavity of the lifting oil cylinder and the balance valve; and a second ball valve is arranged between the rod cavity of the lifting oil cylinder and the pressure reducing valve.
6. The rewinding and unwinding trolley hydraulic system valve station according to claim 5, characterized in that: and the control end of the balance valve is connected to the oil return pipe between the second ball valve and the pressure reducing valve.
7. The rewinding and unwinding trolley hydraulic system valve station according to claim 6, characterized in that: the proportional reversing valve is a three-position four-way proportional reversing valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220410743.6U CN216788842U (en) | 2022-02-28 | 2022-02-28 | Hydraulic system valve table of rewinding and unwinding trolley |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220410743.6U CN216788842U (en) | 2022-02-28 | 2022-02-28 | Hydraulic system valve table of rewinding and unwinding trolley |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216788842U true CN216788842U (en) | 2022-06-21 |
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ID=82000183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220410743.6U Active CN216788842U (en) | 2022-02-28 | 2022-02-28 | Hydraulic system valve table of rewinding and unwinding trolley |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216788842U (en) |
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2022
- 2022-02-28 CN CN202220410743.6U patent/CN216788842U/en active Active
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