CN110131225B - Hydraulic control loop and method for lower die locking cylinder of bending machine - Google Patents
Hydraulic control loop and method for lower die locking cylinder of bending machine Download PDFInfo
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- CN110131225B CN110131225B CN201910260051.0A CN201910260051A CN110131225B CN 110131225 B CN110131225 B CN 110131225B CN 201910260051 A CN201910260051 A CN 201910260051A CN 110131225 B CN110131225 B CN 110131225B
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- lower die
- bending machine
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- oil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/14—Particular arrangements for handling and holding in place complete dies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/72—Output members, e.g. hydraulic motors or cylinders or control therefor having locking means
Abstract
The invention discloses a hydraulic control loop and a hydraulic control method for a lower die locking cylinder of a bending machine, wherein the method comprises the following steps: the reversing valve enters a second working state, pressure oil enters the first oil port through the pressure reducing valve, flows out of the fourth oil port and enters the rodless cavity, the first check valve is opened, hydraulic oil in the rod cavity enters the third oil port through the first check valve and flows out of the second oil port, and a piston of the lower die locking cylinder of the bending machine stretches out and enters an opening state. And the reversing valve is powered off, the first oil port is cut off, the first one-way valve is cut off, the pressure oil stops flowing, and the lower die locking cylinder of the bending machine stops acting. The reversing valve enters a first working state, pressure oil enters the first oil port through the pressure reducing valve, flows out of the third oil port, enters the rod cavity after passing through the supercharger, and the piston of the lower die locking cylinder of the bending machine retracts to be in a locking state. The hydraulic control loop and the hydraulic control method for the lower die locking cylinder of the bending machine do not need to be provided with a hydraulic station for pressurization, and are low in cost, simple in installation and maintenance and high in response speed.
Description
Technical Field
The invention relates to the technical field of hydraulic control, in particular to a hydraulic control loop and a hydraulic control method for a lower die locking cylinder of a bending machine.
Background
The hydraulic transmission is a transmission mode for energy transmission and control by taking liquid as a working medium, and is widely applied to the field of mechanical control. For example, the lower die locking cylinder of the bending machine realizes opening, stopping, locking and other operations under hydraulic control.
The hydraulic control circuit of bender lower mould locking cylinder that prior art provided includes: the hydraulic pressure station, pressure regulating valves, relief valve, switching-over valve and pressure relay. When a lower die locking cylinder of a bending machine is started, pressure oil is output by a hydraulic station, a pressure regulating valve group is used for setting the pressure required by the system, the pressure oil enters a reversing valve through a P port and flows out of a B port and enters a rodless cavity, and hydraulic oil in a rod cavity enters the reversing valve through an A port and flows out of a T port and returns oil. When P, T, A, B oil of the reversing valve is cut off, the movement of the lower die locking cylinder of the bending machine is stopped. During locking, the hydraulic station is started, pressure oil is output, the pressure regulating valve group sets the required pressure of the system, the pressure oil enters a rod cavity of a lower die locking cylinder of the bending machine through the reversing valve, hydraulic oil in a rodless cavity flows back to the oil tank through the reversing valve, a pressure relay locks a pressure point to send a signal, the hydraulic station stops working, and locking is completed.
The inventor finds that the prior art has at least the following problems: the hydraulic station is arranged to provide the pressure required by the hydraulic oil, so that the system is high in cost and large in size, and the field arrangement difficulty is increased.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a hydraulic control loop and a hydraulic control method for a lower die locking cylinder of a bending machine. The specific technical scheme is as follows:
in a first aspect, a hydraulic control circuit for a lower die locking cylinder of a bending machine is provided, which includes: the device comprises a reversing valve, a supercharger, a pressure reducing valve and a pressure relay; a first oil port of the reversing valve is used for feeding oil, a second oil port of the reversing valve is used for discharging oil, a fourth oil port of the reversing valve is communicated with a rodless cavity of a lower die locking cylinder of a bending machine, a third oil port of the reversing valve is communicated with a rod cavity of the lower die locking cylinder of the bending machine through the supercharger, the rod cavity of the lower die locking cylinder of the bending machine is communicated with the third oil port through a first check valve, when the first check valve is opened, hydraulic oil in the rod cavity can flow to the third oil port, when the reversing valve is in a first working state, the first oil port is communicated with the third oil port, the second oil port is communicated with the fourth oil port, and when the reversing valve is in a second working state, the first oil port is communicated with the fourth oil port, and the second oil port is communicated with the third oil port; the pressure reducing valve is connected to an oil inlet pipeline of the first oil port and used for adjusting oil inlet pressure of the reversing valve, and the supercharger is used for supercharging pressure oil; and the pressure relay is used for detecting the locking pressure of the lower die locking cylinder of the bending machine and controlling the reversing valve to act according to the locking pressure.
In one possible design, the pressure intensifier includes a piston and a piston control valve that controls the reciprocating movement of the piston until the pressure oil reaches a preset pressure.
In one possible design, the circuit further includes a safety valve, one end of the safety valve is connected to the pipeline between the rodless chamber and the fourth oil port, and the other end of the safety valve is connected to the oil outlet pipeline of the second oil port.
In one possible design, the pressure relay comprises a first contact and a second contact, the reversing valve is powered into a first working state when the first contact is closed, and the reversing valve is powered off when the second contact is closed; when the locking pressure reaches a preset locking pressure point, the second contact is closed, and when the locking pressure is smaller than the preset locking pressure point, the first contact is closed.
In one possible design, the first check valve is a pilot operated check valve inside the supercharger, and the first check valve opens when the directional control valve is energized into the second state.
In a second aspect, a hydraulic control method for a lower die locking cylinder of a bending machine is provided, and the method comprises the following steps:
the reversing valve is electrified to enter a second working state, pressure oil enters the first oil port through the pressure reducing valve, flows out of the fourth oil port, enters a rodless cavity of the lower die locking cylinder of the bending machine, the first check valve is opened, hydraulic oil in the rod cavity of the lower die locking cylinder of the bending machine enters the third oil port through the first check valve and flows out of the second oil port, a piston of the lower die locking cylinder of the bending machine extends out, and the lower die locking cylinder of the bending machine enters an opened state;
the reversing valve is powered off, the first oil port is cut off, the first one-way valve is cut off, pressure oil stops flowing, and the lower die locking cylinder of the bending machine stops acting;
the reversing valve is electrified to enter a first working state, pressure oil enters the first oil port through the pressure reducing valve, flows out of the third oil port, enters the rod cavity after being pressurized by the supercharger, the piston of the lower die locking cylinder of the bending machine retracts to be in a locking state, and the pressure relay controls the reversing valve to be electrified or deenergized to enable the lower die bending machine locking cylinder to keep in the locking state.
In one possible design, the pressure relay controls the reversing valve to be powered on or powered off to keep the bending machine lower die locking cylinder in a locking state, and the method comprises the following steps: when the locking pressure of the bending machine lower die locking cylinder reaches a preset locking pressure point, the second contact is closed, the reversing valve is powered off, when the locking pressure of the bending machine lower die locking cylinder is smaller than the preset locking pressure point, the first contact is closed, and the reversing valve is powered on to enter a first working state.
The technical scheme of the invention has the following main advantages:
according to the hydraulic control loop and the hydraulic control method for the lower die locking cylinder of the bending machine, the pressure of hydraulic oil is controlled through the supercharger and the pressure reducing valve, compared with the prior art, an independent high-pressure hydraulic station is not required for supercharging, the operation is simple, convenient and effective, the cost is lower, the installation and maintenance are simpler, the hydraulic station is not required to be frequently started, and the response speed is higher.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a hydraulic control circuit of a lower die locking cylinder of a bending machine according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
In a first aspect, an embodiment of the present invention provides a hydraulic control circuit of a lower die locking cylinder of a bending machine, as shown in fig. 1, the hydraulic control circuit of the lower die locking cylinder of the bending machine includes: a reversing valve 1, a booster 2, a pressure reducing valve 3 and a pressure relay 4. The first oil port P of the reversing valve 1 is used for feeding oil, the second oil port T is used for discharging oil, the fourth oil port B is communicated with a rodless cavity of a bending machine lower die locking cylinder, the third oil port A is communicated with a rod cavity of the bending machine lower die locking cylinder through a supercharger 2, the rod cavity of the bending machine lower die locking cylinder is communicated with the third oil port A through a first check valve POV, when the first check valve POV is opened, hydraulic oil in the rod cavity can circulate to the third oil port A, when the reversing valve 1 is in a first working state, the first oil port P is communicated with the third oil port A, the second oil port T is communicated with the fourth oil port B, when the reversing valve 1 is in a second working state, the first oil port P is communicated with the fourth oil port B, and the second oil port T is communicated with the third oil port A. The reducing valve 3 is connected to an oil inlet pipeline of the first oil port P and used for adjusting oil inlet pressure of the reversing valve 1, and the supercharger 2 is used for supercharging pressure oil. And the pressure relay 4 is used for detecting the locking pressure of the lower die locking cylinder of the bending machine and controlling the reversing valve 1 to act according to the locking pressure.
The working principle of the hydraulic control circuit of the lower die locking cylinder of the bending machine provided by the embodiment of the invention is explained as follows:
when the device is used, the working states of the reversing valve 1 and the first one-way valve POV can be adjusted in real time, so that the lower die locking cylinder of the bending machine enters an opening, stopping or locking state. When the lower die locking cylinder of the bending machine needs to be opened, Yb of the reversing valve 1 is electrified, the reversing valve 1 enters a second working state, the first oil port P is communicated with the fourth oil port B, and the second oil port T is communicated with the third oil port A. Pressure oil enters a first oil port P through a pressure reducing valve 3, flows out of a fourth oil port B and enters a rodless cavity of a bending machine lower die locking cylinder, a first check valve POV is opened, hydraulic oil in the rod cavity of the bending machine lower die locking cylinder enters a third oil port A through the first check valve POV and flows out of a second oil port T, a piston of the lower die bending machine locking cylinder extends out, and the bending machine lower die locking cylinder enters an opening state. When the piston of the lower die locking cylinder of the bending machine needs to stop to act, the reversing valve 1 is powered off, the first oil port P is cut off, hydraulic oil cannot flow into the rodless cavity, the first check valve POV is cut off, hydraulic oil in the rod cavity cannot flow out, the hydraulic oil stops flowing, and the lower die locking cylinder of the bending machine stops acting. When a bending machine lower die locking cylinder needs to be locked, Ya of the reversing valve 1 is powered on, the reversing valve 1 enters a first working state, a first oil port P is communicated with a third oil port A, a second oil port T is communicated with a fourth oil port B, pressure oil enters the first oil port P through the pressure reducing valve 3 and flows out of the third oil port A, a rod cavity of the bending machine lower die locking cylinder is formed after the pressure oil is boosted by the booster 2, a piston of the bending machine lower die locking cylinder retracts to be in a locking state, and the pressure relay 4 controls the reversing valve 1 to be powered on or powered off, so that the bending machine lower die locking cylinder keeps the locking state.
Therefore, the hydraulic control loop of the lower die locking cylinder of the bending machine provided by the embodiment of the invention controls the pressure of hydraulic oil through the supercharger 2 and the pressure reducing valve 3, compared with the prior art, an independent high-pressure hydraulic station is not required for supercharging, the operation is simple, convenient and effective, the cost is lower, the installation and maintenance are simpler, the hydraulic station is not required to be frequently started, and the response speed is higher.
Here, how the supercharger 2 supercharges the hydraulic oil is explained by way of example as follows: the supercharger 2 includes a piston PSV and a piston control valve PCV that controls the piston PSV to reciprocate until the pressure oil reaches a preset pressure. When the piston PSV of the supercharger 2 acts, hydraulic oil is supercharged, and one round trip of the piston PSV supercharges the hydraulic oil by preset pressure. The piston control valve PCV controls the reciprocating times of the piston PSV, so that the hydraulic oil is pressurized to a preset pressure.
Specifically, each time the piston PSV moves to the end portion, an arrival signal S is sent to the piston control valve PCV, and after the piston control valve PCV receives the arrival signal S, whether the pressure of the hydraulic oil reaches a preset pressure is determined, if yes, the piston PSV stops moving, and if not, the piston control valve PCV controls the piston PSV to reset and then continues to move to the end portion.
Further, in order to improve safety performance, the hydraulic control circuit of the bending machine lower die locking cylinder provided by the embodiment of the invention further comprises a safety valve 5, wherein one end of the safety valve 5 is connected with a pipeline between the rodless cavity of the bending machine lower die locking cylinder and the fourth oil port B, and the other end of the safety valve is connected with an oil outlet pipeline of the second oil port T.
Alternatively, the pressure relay 4 includes a first contact FD1 and a second contact FD2, the changeover valve 1 being energized into the first operating state when the first contact FD1 is closed, and the changeover valve 1 being de-energized when the second contact FD2 is closed. When the locking pressure reaches the preset locking pressure point, the second contact FD2 is closed, and when the locking pressure is smaller than the preset locking pressure point, the first contact FD1 is closed. So set up, can make bender lower mould locking cylinder remain throughout and predetermine locking pressure point department, locking performance is better.
In the embodiment of the invention, the first check valve POV is a hydraulic control check valve in the supercharger 2, and when the reversing valve 1 is electrified and enters the second state, the first check valve POV is opened. So set up, when switching-over valve 1 got into the second working condition, first check valve POV opened, and the hydraulic oil in having the pole chamber can flow back smoothly.
Specifically, when the directional control valve 1 is in the second operating state, the control oil PL from the fourth port B opens the first check valve POV.
Optionally, as shown in fig. 1, the hydraulic control circuit of the lower die locking cylinder of the bending machine provided in the embodiment of the present invention further includes a second check valve CV1 and a third check valve CV2, where the second check valve CV1 and the third check valve CV2 do not hinder the normal flow of hydraulic oil, so as to avoid the backflow of hydraulic oil, and improve the safety and stability of use. Wherein, the second check valve CV1 and the third check valve CV2 are both check valves inside the supercharger 2.
In a second aspect, an embodiment of the present invention provides a hydraulic control method for a lower die locking cylinder of a bending machine, where the method includes:
the reversing valve 1 is electrified to enter a second working state, pressure oil enters a first oil port P through a pressure reducing valve 3, flows out of a fourth oil port B and enters a rodless cavity of a bending machine lower die locking cylinder, a first check valve POV is opened, hydraulic oil in a rod cavity of the bending machine lower die locking cylinder enters a third oil port A through the first check valve POV, flows out of a second oil port T, a piston of the bending machine lower die locking cylinder extends out, and the bending machine lower die locking cylinder enters an opening state.
The reversing valve 1 is powered off, the first oil port P is cut off, the first check valve POV is cut off, hydraulic oil stops flowing, and the lower die locking cylinder of the bending machine stops acting.
The reversing valve 1 is powered on and enters a first working state, pressure oil enters a first oil port P through a pressure reducing valve 3, flows out of a third oil port A, enters a rod cavity of a bending machine lower die locking cylinder after being pressurized by a supercharger 2, a piston of the bending machine lower die locking cylinder retracts to be in a locking state, and the pressure relay 4 controls the reversing valve 1 to be powered on or powered off so that the bending machine lower die locking cylinder keeps in the locking state.
When the device is used, the working states of the reversing valve 1 and the first one-way valve POV can be adjusted in real time, so that the lower die locking cylinder of the bending machine enters an opening, stopping or locking state. When the lower die locking cylinder of the bending machine needs to be opened, Yb of the reversing valve 1 is electrified, the reversing valve 1 enters a second working state, the first oil port P is communicated with the fourth oil port B, and the second oil port T is communicated with the third oil port A. Pressure oil enters a first oil port P through a pressure reducing valve 3, flows out of a fourth oil port B and enters a rodless cavity of a bending machine lower die locking cylinder, a first check valve POV is opened, hydraulic oil in the rod cavity of the bending machine lower die locking cylinder enters a third oil port A through the first check valve POV and flows out of a second oil port T, a piston of the lower die bending machine locking cylinder extends out, and the bending machine lower die locking cylinder enters an opening state. When the piston of the lower die locking cylinder of the bending machine needs to stop to act, the reversing valve 1 is powered off, the first oil port P is cut off, hydraulic oil cannot flow into the rodless cavity, the first check valve POV is cut off, hydraulic oil in the rod cavity cannot flow out, the hydraulic oil stops flowing, and the lower die locking cylinder of the bending machine stops acting. When a bending machine lower die locking cylinder needs to be locked, Ya of the reversing valve 1 is powered on, the reversing valve 1 enters a first working state, a first oil port P is communicated with a third oil port A, a second oil port T is communicated with a fourth oil port B, pressure oil enters the first oil port P through the pressure reducing valve 3 and flows out of the third oil port A, a rod cavity of the bending machine lower die locking cylinder is formed after the pressure oil is boosted by the booster 2, a piston of the bending machine lower die locking cylinder retracts to be in a locking state, and the pressure relay 4 controls the reversing valve 1 to be powered on or powered off, so that the bending machine lower die locking cylinder keeps the locking state.
Therefore, according to the hydraulic control method for the lower die locking cylinder of the bending machine, provided by the embodiment of the invention, the pressure of hydraulic oil is controlled through the supercharger 2 and the pressure reducing valve 3, compared with the prior art, a hydraulic station is not required to be arranged for supercharging, the operation is simple, convenient and effective, the cost is lower, the installation and maintenance are simpler, the hydraulic station is not required to be frequently started, and the response speed is higher.
Wherein, pressure relay 4 control switching-over valve 1 gets electric or loses the electricity, makes bender lower mould locking cylinder keep lock state, includes: when the locking pressure of the bending machine lower die locking cylinder reaches a preset locking pressure point, the second contact FD2 is closed, the reversing valve 1 is powered off, when the locking pressure of the bending machine lower die locking cylinder is smaller than the preset locking pressure point, the first contact FD1 is closed, and the reversing valve 1 is powered on to enter a first working state. Therefore, the working state of the reversing valve 1 is controlled through the pressure relay 4, so that the lower die locking cylinder of the bending machine is always kept in a locking state.
The working principle of the hydraulic control circuit of the lower die locking cylinder of the bending machine provided by the embodiment of the invention is described in the following with reference to the attached drawing 1:
the opening process of the lower die locking cylinder of the bending machine is as follows: yb of the reversing valve 1 is electrified, the first oil port P of the reversing valve 1 is communicated with the fourth oil port B, the third oil port A is communicated with the second oil port T, pressure oil P1 enters from the first oil port P after the pressure reducing valve 3, the fourth oil port B flows out, the pressure oil enters a rodless cavity of a lower die locking cylinder of the bending machine through a pipe B1, meanwhile, control oil PL opens a first one-way valve POV, rod cavity hydraulic oil of a lower die locking cylinder of the bending machine returns oil through a pipe A1, a first one-way valve POV, the third oil port A and the second oil port T, and a piston of the lower die locking cylinder of the bending machine stretches out and loosens.
The lower die locking cylinder of the bending machine stops: the reversing valve 1 is powered off and returns to the middle position, the first oil port P of the reversing valve is cut off at the moment, the third oil port A, the fourth oil port B and the second oil port T are communicated, the first check valve POV is locked, no oil flows, and the lower die locking cylinder of the bending machine stops moving.
Locking a lower die locking cylinder of the bending machine: the pressure reducing valve 3 is used for setting inlet pressure P1 of the reversing valve 1, Ya of the reversing valve 1 is electrified, at the moment, a first oil port P of the reversing valve 1 is communicated with a third oil port A, a fourth oil port B is communicated with a second oil port TT, pressure oil P1 achieves pressure rise through the pressure increasing function of the pressure booster 2, the pressure oil P2 after pressure rise enters a rod cavity of a lower die locking cylinder of the bending machine through a pipe A1, a piston of the lower die locking cylinder of the bending machine retracts to be in a locking state, a second contact FD2 of the pressure relay 4 sends a signal, Ya of the reversing valve 1 is powered off, and the reversing valve 1 returns to a middle position for pressure maintaining; when the first contact FD1 of pressure relay 4 signals, the Ya of switching-over valve 1 gets electric again, locks again, so circulation, the Ya that controls switching-over valve 1 through pressure relay 4 gets electric/cuts off the power supply and realizes locking.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. The utility model provides a hydraulic control return circuit of bender lower mould locking cylinder which characterized in that includes: the device comprises a reversing valve, a supercharger, a pressure reducing valve and a pressure relay;
a first oil port of the reversing valve is used for feeding oil, a second oil port of the reversing valve is used for discharging oil, a fourth oil port of the reversing valve is communicated with a rodless cavity of a lower die locking cylinder of a bending machine, a third oil port of the reversing valve is communicated with a rod cavity of the lower die locking cylinder of the bending machine through the supercharger, the rod cavity of the lower die locking cylinder of the bending machine is communicated with the third oil port through a first check valve, when the first check valve is opened, hydraulic oil in the rod cavity can flow to the third oil port, when the reversing valve is in a first working state, the first oil port is communicated with the third oil port, the second oil port is communicated with the fourth oil port, and when the reversing valve is in a second working state, the first oil port is communicated with the fourth oil port, and the second oil port is communicated with the third oil port;
the pressure reducing valve is connected to an oil inlet pipeline of the first oil port and used for adjusting oil inlet pressure of the reversing valve, and the supercharger is used for supercharging pressure oil;
and the pressure relay is used for detecting the locking pressure of the lower die locking cylinder of the bending machine and controlling the reversing valve to act according to the locking pressure.
2. The hydraulic control circuit of a lower die locking cylinder of a bending machine according to claim 1, wherein the pressure booster comprises a piston and a piston control valve, and the piston control valve controls the reciprocating motion of the piston until pressure oil reaches a preset pressure.
3. The hydraulic control circuit of the lower die locking cylinder of the bending machine according to claim 1, characterized in that the circuit further comprises a safety valve, one end of the safety valve is connected with a pipeline between the rodless cavity and the fourth oil port, and the other end of the safety valve is connected with an oil outlet pipeline of the second oil port.
4. The hydraulic control circuit of a lower die locking cylinder of a bending machine according to claim 1, wherein the pressure relay comprises a first contact and a second contact, when the first contact is closed, the reversing valve is powered on to enter a first working state, and when the second contact is closed, the reversing valve is powered off;
when the locking pressure reaches a preset locking pressure point, the second contact is closed, and when the locking pressure is smaller than the preset locking pressure point, the first contact is closed.
5. The hydraulic control circuit of a lower die locking cylinder of a bending machine according to claim 1, wherein the first one-way valve is a hydraulic control one-way valve inside the pressure booster, and when the reversing valve is electrified to enter the second state, the first one-way valve is opened.
6. A hydraulic control method of a lower die locking cylinder of a bending machine, which is implemented by using the hydraulic control circuit of the lower die locking cylinder of the bending machine according to claim 4, and is characterized by comprising the following steps:
the reversing valve is electrified to enter a second working state, pressure oil enters the first oil port through the pressure reducing valve, flows out of the fourth oil port, enters a rodless cavity of the lower die locking cylinder of the bending machine, the first check valve is opened, hydraulic oil in the rod cavity of the lower die locking cylinder of the bending machine enters the third oil port through the first check valve and flows out of the second oil port, a piston of the lower die locking cylinder of the bending machine extends out, and the lower die locking cylinder of the bending machine enters an opened state;
the reversing valve is powered off, the first oil port is cut off, the first one-way valve is cut off, pressure oil stops flowing, and the lower die locking cylinder of the bending machine stops acting;
the reversing valve is electrified to enter a first working state, pressure oil enters the first oil port through the pressure reducing valve, flows out of the third oil port, enters the rod cavity after being pressurized by the supercharger, the piston of the lower die locking cylinder of the bending machine retracts to be in a locking state, and the pressure relay controls the reversing valve to be electrified or deenergized to enable the lower die bending machine locking cylinder to keep in the locking state.
7. The hydraulic control method for the lower die locking cylinder of the bending machine according to claim 6, wherein the pressure relay controls the reversing valve to be powered on or powered off so that the lower die locking cylinder of the bending machine keeps a locking state, and the method comprises the following steps:
when the locking pressure of the bending machine lower die locking cylinder reaches a preset locking pressure point, the second contact is closed, the reversing valve is powered off, when the locking pressure of the bending machine lower die locking cylinder is smaller than the preset locking pressure point, the first contact is closed, and the reversing valve is powered on to enter a first working state.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410272A (en) * | 2011-12-03 | 2012-04-11 | 南京埃尔法电液技术有限公司 | Electrohydraulic servo bending machine hydraulic system |
| CN202326477U (en) * | 2011-12-08 | 2012-07-11 | 东莞大同数控机械有限公司 | Novel torsion shaft bending machine hydraulic system |
| CN102678662A (en) * | 2012-05-14 | 2012-09-19 | 长沙金阳机械设备科技开发有限公司 | Fast-slow speed stoke integrated energy-saving oil cylinder and application device thereof |
| CN103846490A (en) * | 2012-11-30 | 2014-06-11 | 无锡市协新气动有限公司 | Plate hydraulic shearing machine system |
| CN104196783A (en) * | 2014-08-20 | 2014-12-10 | 马鞍山裕华机械制造有限公司 | Integrated series cylinder synchronous hydraulic system for bending machine |
| JP6361475B2 (en) * | 2014-11-18 | 2018-07-25 | コベルコ建機株式会社 | Pin coupling device |
| CN205089714U (en) * | 2015-11-03 | 2016-03-16 | 安徽天水液压机床科技有限公司 | Pneumatic cylinder oil piping system of numerical control hydraulic pressure sheet material tubulation make -up machine |
| CN105626610A (en) * | 2016-03-21 | 2016-06-01 | 山东理工大学 | Energy-saving system of mechanical arm of energy-saving bagging machine |
| CN105835392B (en) * | 2016-06-22 | 2017-10-13 | 扬州市工兵机械有限公司 | A kind of stroke adjustment built-in precise fast pressure machine and its oil cylinder and application method |
| CN105909582B (en) * | 2016-06-30 | 2017-04-05 | 马鞍山市致呈机电有限公司 | A kind of hydraulic system of steel ladle hydraulic pressure turn-over device |
| CN106077168B (en) * | 2016-06-30 | 2018-04-03 | 马鞍山九天智控科技有限公司 | A kind of plate bending method of intelligent numerical control bender |
| CN206592359U (en) * | 2016-12-17 | 2017-10-27 | 许昌学院 | A kind of hydraulic system |
| CN206503793U (en) * | 2017-02-14 | 2017-09-19 | 扬州市江都永坚有限公司 | A kind of numerical control bender integrated hydraulic system |
| CN106884821A (en) * | 2017-03-24 | 2017-06-23 | 天津市创宜流体技术有限公司 | A kind of plant produced line material conveying robot hydraulic system |
| CN107061392B (en) * | 2017-06-06 | 2018-07-03 | 山东建筑大学 | Mechanical arm hydraulic control circuit and method of operating |
| CN207463881U (en) * | 2017-11-27 | 2018-06-08 | 安徽东海机床制造有限公司 | A kind of frame bender |
| CN108907336B (en) * | 2018-06-20 | 2024-01-12 | 谭明 | Control method of numerical control double-station cutting machine |
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2019
- 2019-04-02 CN CN201910260051.0A patent/CN110131225B/en active Active
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