Hydraulic control system for variable-amplitude oil cylinder of lightering crane and control method of hydraulic control system

Abstract

The invention discloses a hydraulic control system and method for a variable-amplitude oil cylinder of a lightering crane, and relates to the technical field of hydraulic control systems of cranes. The hydraulic control system comprises a hydraulic oil output assembly, the hydraulic oil output assembly outputs hydraulic oil in an oil tank to a port P, and the port P is connected to a first electromagnetic control valve and a second logic valve; the outlet end of the second logic valve is connected to the first control valve, the other connecting port of the first control valve is connected to the oil cylinder small cavity, and the first control valve is used for forward or reverse flow of hydraulic oil; the oil cylinder large cavity is connected to a first logic valve and a fourth electromagnetic control valve, and the other end of the first logic valve is connected with an oil return tank; the outlet end of the second logic valve is further connected to a second electromagnetic control valve and a third logic valve, the outlet end of the third logic valve is connected to the oil cylinder large cavity, and hydraulic oil enters the oil cylinder small cavity through the first control valve from the outlet of the second logic valve or enters the oil cylinder large cavity through the third logic valve. The structure is simple, and the effect of compactly arranging the amplitude variation system is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of crane hydraulic control systems, and in particular to a hydraulic control system for a variable-luff cylinder of a barge crane and a control method thereof. Background Art

[0002] Barge cranes are widely used in dock transfer systems. They are responsible for material handling operations at small docks where materials need to be transferred from small barges to large ships, or from large ships to small boats due to the small tonnage of barges.

[0003] Since it is installed and used on the deck of the ship, its installation space is relatively small, and various supporting components of the crane are required to save space as much as possible. In addition, due to its operating environment, the system is required to be stable and reliable, and the control is simple and effective. Summary of the invention

[0004] The purpose of the present invention is to provide a hydraulic control system for the boom cylinder of a barge crane, which has a simple structure and changes the control method of the traditional open system that uses a three-position four-way reversing valve to realize the retraction and extension of the cylinder. The spatial size is smaller than that of the traditional method, and it has good promotion and usability for compactly arranged boom systems.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A hydraulic control system for a variable-luffing oil cylinder of a barge crane, comprising a hydraulic oil output assembly, the hydraulic oil output assembly outputs the hydraulic oil in the oil tank to a P port, the P port is connected to a first electromagnetic control valve and a second logic valve, the first electromagnetic control valve controls the opening and closing of the second logic valve, the outlet end of the second logic valve is connected to the first control valve, the other connecting port of the first control valve is connected to a small chamber of the oil cylinder, and the first control valve allows the hydraulic oil to flow forward or backward to enter or leave the small chamber of the oil cylinder; The large chamber of the oil cylinder is connected to the first logic valve and the fourth electromagnetic control valve. The fourth electromagnetic control valve controls the opening and closing of the first logic valve. The other end of the first logic valve is connected back to the oil tank. The outlet end of the second logic valve is also connected to the second solenoid control valve and the third logic valve. The second solenoid control valve controls the opening and closing of the third logic valve. The outlet end of the third logic valve is connected to the large chamber of the oil cylinder. The hydraulic oil enters the small chamber of the oil cylinder from the outlet of the second logic valve through the first control valve, or enters the large chamber of the oil cylinder through the third logic valve.

[0006] Furthermore, the outlet end of the first electromagnetic control valve is connected to the control port end of the second logic valve, and the opening and closing of the first electromagnetic control valve controls the on-off of the hydraulic oil therein, thereby completing the opening and closing control of the second logic valve.

[0007] Furthermore, the control port end of the second logic valve is connected to the OR-type shuttle valve, and two inlet ends of the OR-type shuttle valve are respectively connected to the outlet end of the first electromagnetic control valve and the outlet end of the second logic valve.

[0008] Furthermore, the outlet end of the second electromagnetic control valve is connected to the control port end of the third logic valve, and the opening and closing of the second electromagnetic control valve controls the on-off of the hydraulic oil therein, thereby completing the opening and closing control of the third logic valve.

[0009] Furthermore, the control port end of the third logic valve is connected to the OR-type shuttle valve, and two inlet ends of the OR-type shuttle valve are respectively connected to the outlet end of the second electromagnetic control valve and the outlet end of the third logic valve.

[0010] Furthermore, the first control valve includes a one-way valve chamber and a control chamber. The one-way valve chamber supplies hydraulic oil from the outlet end of the second logic valve into the small chamber of the oil cylinder. After the first control valve is energized, it switches to the control chamber, and the control chamber supplies hydraulic oil in the small chamber of the oil cylinder to leave.

[0011] Furthermore, a second control valve is provided between the large chamber of the oil cylinder and the first logic valve, one end of the second control valve is connected to the large chamber of the oil cylinder, and the other connecting port is connected to the first logic valve. The first control valve allows hydraulic oil to flow forward or reversely, entering or leaving the large chamber of the oil cylinder.

[0012] Furthermore, it also includes a sixth solenoid valve, one end of which is connected to the large chamber of the oil cylinder, and the other end is connected to the control end of the second control valve. After being energized, the hydraulic oil is passed into the control end of the second control valve to drive the second control valve to switch the valve chamber.

[0013] Furthermore, the second control valve includes a one-way valve chamber and a control chamber. The one-way valve chamber supplies hydraulic oil from the outlet end of the third logic valve into the large chamber of the oil cylinder. After the sixth solenoid valve is energized, the hydraulic oil enters the control end of the second control valve from the large chamber of the oil cylinder, driving the second control valve to switch to the control chamber, and the control chamber supplies the hydraulic oil in the large chamber of the oil cylinder to leave.

[0014] The present application also discloses a control method for a hydraulic control system of a barge crane luffing cylinder, comprising the following steps: When the amplitude is changed to perform the descending action, the hydraulic oil output assembly outputs the hydraulic oil in the oil tank to the P port, the first electromagnetic control valve is electrically switched, and the second logic valve is controlled to be opened in one direction, and the hydraulic oil in the P port enters the first control valve through the second logic valve, and then flows into the small chamber of the oil cylinder to push the oil cylinder piston back; the fourth electromagnetic control valve is electrically switched, and the first logic valve is controlled to be opened, so that the hydraulic oil in the large chamber of the oil cylinder returns to the oil tank through the first logic valve; When the amplitude variation performs the rising action, the second logic valve remains open, the second solenoid control valve is electrically switched to control the third logic valve to open in one direction, and the hydraulic oil at the P port enters the large chamber of the cylinder through the second logic valve and the third logic valve. The cylinder performs the extension action, and the hydraulic oil in the small chamber is pushed out. The first control valve is switched to control the hydraulic oil in the small chamber to flow out in the opposite direction, and the oil from the P port in the second logic valve is merged into the third logic valve and enters the large chamber of the cylinder, thereby realizing the rapid push out of the cylinder.

[0015] In summary, the present invention has the following beneficial effects: The traditional open system uses a three-position four-way reversing valve to control the cylinder's retraction and extension, and uses a logic unit to switch the direction. At the same time, the load's own gravity is used to control the cylinder's descent under the variable-length working condition. A simple small solenoid valve combination is used in the boom lifting and lowering switch to achieve the action switching of the actuator.

[0016] The control method of the barge crane cylinder hydraulic system has a simple structure and smaller space dimensions than traditional methods, and has good promotion and usability for compactly arranged variable-length systems. Since the components that constitute the entire control system are relatively simple, the system control values ​​are more concise and effective than traditional methods, and therefore have good market promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of a hydraulic control system for a luffing cylinder of a barge crane according to the present invention; Figure 2 yes Figure 1 The structural diagram of the hydraulic control part; Figure 3 It is a hydraulic principle diagram of a hydraulic control system of a barge crane luffing cylinder of the present invention when the luffing is performed in a descending action; Figure 4 It is a control principle diagram of a hydraulic control system of a barge crane luffing cylinder of the present invention when the luffing is performed to descend; Figure 5 It is a hydraulic principle diagram of a hydraulic control system of a barge crane luffing cylinder of the present invention when the luffing is performed to rise; Figure 6 The invention discloses a control principle diagram of a hydraulic control system of a barge crane boom cylinder when the boom is changing to perform a rising action. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings, and this embodiment does not constitute a limitation of the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0019] A hydraulic control system for a luffing cylinder of a barge crane, such as Figure 1 As shown, it includes a hydraulic oil output component, which outputs the hydraulic oil in the oil tank to the P port. In this embodiment, the hydraulic oil output component includes multiple pump components YB01, YB02, YB03, and YB04, which are connected to the oil tank and electrically output the hydraulic oil to the P port (P1 and P2 ports).

[0020] like Figure 2 As shown, the P port is connected to the first electromagnetic control valve BV01 and the second logic valve LJ02, the first electromagnetic control valve BV01 controls the opening and closing of the second logic valve LJ02, the outlet end of the second logic valve LJ02 is connected to the first control valve BL01, the other connection port of the first control valve BL01 is connected to the small chamber of the oil cylinder, and the first control valve BL01 allows the hydraulic oil to flow forward or reversely, entering or leaving the small chamber of the oil cylinder; Among them, the outlet end of the first electromagnetic control valve BV01 is connected to the control port end of the second logic valve LJ02, and the opening and closing of the first electromagnetic control valve BV01 controls the on-off of the hydraulic oil therein, completing the opening and closing control of the second logic valve LJ02; The control port end of the second logic valve LJ02 is connected to the OR gate shuttle valve, and the two inlet ends of the OR gate shuttle valve are respectively connected to the outlet end of the first electromagnetic control valve BV01 and the outlet end of the second logic valve LJ02, so that the second logic valve LJ02 can only be opened in one direction; The first control valve BL01 includes a one-way valve chamber and a control chamber. The one-way valve chamber supplies hydraulic oil from the outlet end of the second logic valve LJ02 to the small chamber of the oil cylinder. After the first control valve BL01 is energized, it switches to the control chamber, and the control chamber supplies hydraulic oil in the small chamber of the oil cylinder to leave. In this embodiment, the large chamber of the oil cylinder is also connected to the third solenoid control valve BV03, and the other end of the third solenoid control valve BV03 is connected to the hydraulic control end of the first control valve BL01. After the third solenoid control valve BV03 is energized and opened, hydraulic oil is introduced to drive the first control valve BL01 to switch to the control chamber.

[0021] like Figure 2 As shown, the large chamber of the oil cylinder is connected to the sixth solenoid valve YB06 and the second control valve BL02. One end of the sixth solenoid valve YB06 is connected to the large chamber of the oil cylinder, and the other end is connected to the control end of the second control valve BL02. After being energized, the hydraulic oil is passed into the control end of the second control valve BL02 to drive the second control valve BL02 to switch the valve chamber; The other connection port of the second control valve BL02 is connected to the first logic valve LJ01 and the fourth electromagnetic control valve BV04. The fourth electromagnetic control valve BV04 controls the opening and closing of the first logic valve LJ01. The other end of the first logic valve LJ01 is connected back to the oil tank. One end of the second control valve BL02 is connected to the large chamber of the oil cylinder, and the other connection port is connected to the first logic valve LJ01, so that the hydraulic oil can flow forward or reversely into or out of the large chamber of the oil cylinder; Among them, the second control valve BL02 includes a one-way valve chamber and a control chamber. The one-way valve chamber supplies hydraulic oil from the outlet end of the third logic valve LJ03 to enter the large chamber of the cylinder. After the sixth solenoid valve YB06 is energized, the hydraulic oil enters the control end of the second control valve BL02 from the large chamber of the cylinder, driving the second control valve BL02 to switch to the control chamber, and the control chamber supplies the hydraulic oil in the large chamber of the cylinder to leave.

[0022] like Figure 2 As shown, the outlet end of the second logic valve LJ02 is also connected to the second solenoid control valve BL02 and the third logic valve LJ03. The second solenoid control valve BL02 controls the opening and closing of the third logic valve LJ03. The outlet end of the third logic valve LJ03 is connected to the large chamber of the oil cylinder. The hydraulic oil enters the small chamber of the oil cylinder from the outlet of the second logic valve LJ02 through the first control valve BL01, or enters the large chamber of the oil cylinder through the third logic valve LJ03. The outlet end of the second electromagnetic control valve BL02 is connected to the control port end of the third logic valve LJ03. The opening and closing of the second electromagnetic control valve BL02 controls the on-off of the hydraulic oil therein, completing the opening and closing control of the third logic valve LJ03. The control port end of the third logic valve LJ03 is connected to the OR-type shuttle valve, and the two inlet ends of the OR-type shuttle valve are respectively connected to the outlet end of the second electromagnetic control valve BL02 and the outlet end of the third logic valve LJ03, so that the third logic valve LJ03 can only be opened in one direction.

[0023] The present application also discloses a control method for a hydraulic control system of a barge crane luffing cylinder, comprising the following steps: like Figure 3 and Figure 4 As shown, when the amplitude change is performed to descend, the handle starts to operate, the electric control signal enters the PLC, and the PLC gives a signal to control the hydraulic oil output components YB01, YB02, YB03, and YB04 to output hydraulic oil electrically, and output the hydraulic oil in the oil tank to the P1 and P2 ports; like Figure 3 In the direction of the black bold oil circuit, the first electromagnetic control valve BV01 is energized to switch direction, disconnecting the hydraulic oil circuit, so that the second logic valve LJ02 is opened in one direction, and the hydraulic oil at the P1 and P2 ports enters the one-way valve chamber of the first control valve BL01 through the second logic valve LJ02, and then flows into the small chamber of the oil cylinder, pushing the oil cylinder piston back; like Figure 3The direction of the blue bold oil circuit part in the middle, the sixth solenoid valve YB06 and the whole machine operating handle are jointly controlled. When the handle executes the descending command, the sixth solenoid valve YB06 starts to load the current to conduct, and the control oil circuit passes through the second control valve BL02 and enters the control end of the second control valve BL02, driving the second control valve BL02 to switch to the control chamber, and the hydraulic oil in the large chamber of the oil supply cylinder in the control chamber enters the first logic valve LJ01 from the second control valve BL02, and the fourth solenoid control valve BV04 is energized to control the first logic valve LJ01 to conduct, allowing the hydraulic oil to flow back to the oil tank.

[0024] like Figure 5 and Figure 6 As shown, when the amplitude change is performed to rise, the handle starts to operate, the electric control signal enters the PLC, and the PLC gives a signal to control the hydraulic oil output components YB01, YB02, YB03, and YB04 to output hydraulic oil electrically, and output the hydraulic oil in the oil tank to the P1 and P2 ports; like Figure 5 In the direction of the black bold oil circuit, the second logic valve LJ02 remains open, the second solenoid control valve BL02 is energized to change direction, and the third logic valve LJ03 is controlled to be one-way open. The sixth solenoid valve YB06 is de-energized and disconnected, and the second control valve BL02 is reset to the one-way valve chamber. The hydraulic oil supplied to the P port passes through the second logic valve LJ02, the third logic valve LJ03, and the second control valve BL02 in sequence into the large chamber of the oil cylinder. The oil cylinder performs the extension action, and the hydraulic oil in the small chamber is pushed out. The first control valve BL01 is switched (after the third solenoid control valve BV03 is energized and opened, the hydraulic oil in the large chamber of the cylinder is introduced and the first control valve BL01 is driven to switch to the control chamber), controlling the hydraulic oil in the small chamber to flow out in the opposite direction, and merging with the oil from the P port in the second logic valve LJ02 into the third logic valve LJ03, and entering the large chamber of the cylinder, thereby realizing the rapid ejection of the cylinder.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions should also be deemed to fall within the protection scope of the technical solution of the present invention.

Claims

1. A hydraulic control system for a luffing cylinder of a barge crane, characterized by: It includes a hydraulic oil output assembly, which outputs the hydraulic oil in the oil tank to the P port, which is connected to the first electromagnetic control valve and the second logic valve, the first electromagnetic control valve controls the opening and closing of the second logic valve, the outlet end of the second logic valve is connected to the first control valve, the other connecting port of the first control valve is connected to the small chamber of the oil cylinder, and the first control valve allows the hydraulic oil to flow forward or reversely to enter or leave the small chamber of the oil cylinder; The large chamber of the oil cylinder is connected to the first logic valve and the fourth electromagnetic control valve. The fourth electromagnetic control valve controls the opening and closing of the first logic valve. The other end of the first logic valve is connected back to the oil tank. The outlet end of the second logic valve is also connected to the second solenoid control valve and the third logic valve. The second solenoid control valve controls the opening and closing of the third logic valve. The outlet end of the third logic valve is connected to the large chamber of the oil cylinder. The hydraulic oil enters the small chamber of the oil cylinder from the outlet of the second logic valve through the first control valve, or enters the large chamber of the oil cylinder through the third logic valve.

2. A hydraulic control system for a luffing cylinder of a barge crane according to claim 1, characterized in that: The outlet end of the first electromagnetic control valve is connected to the control port end of the second logic valve. The opening and closing of the first electromagnetic control valve controls the on-off of the hydraulic oil therein, thereby completing the opening and closing control of the second logic valve.

3. The hydraulic control system for the luffing cylinder of a barge crane according to claim 2 is characterized by: The control port end of the second logic valve is connected to the OR-type shuttle valve, and the two inlet ends of the OR-type shuttle valve are respectively connected to the outlet end of the first electromagnetic control valve and the outlet end of the second logic valve.

4. A hydraulic control system for a luffing cylinder of a barge crane according to claim 1 or 2, characterized in that: The outlet end of the second electromagnetic control valve is connected to the control port end of the third logic valve. The opening and closing of the second electromagnetic control valve controls the on-off of the hydraulic oil therein, thereby completing the opening and closing control of the third logic valve.

5. The hydraulic control system for the luffing cylinder of a barge crane according to claim 4, characterized in that: The control port end of the third logic valve is connected to the OR-type shuttle valve, and the two inlet ends of the OR-type shuttle valve are respectively connected to the outlet end of the second electromagnetic control valve and the outlet end of the third logic valve.

6. The hydraulic control system for the luffing cylinder of a barge crane according to claim 1, characterized in that: The first control valve includes a one-way valve chamber and a control chamber. The one-way valve chamber supplies hydraulic oil from the outlet end of the second logic valve into the small chamber of the oil cylinder. After the first control valve is energized, it switches to the control chamber, and the control chamber supplies hydraulic oil in the small chamber of the oil cylinder to leave.

7. The hydraulic control system for the luffing cylinder of a barge crane according to claim 1, characterized in that: A second control valve is also provided between the large chamber of the oil cylinder and the first logic valve. One end of the second control valve is connected to the large chamber of the oil cylinder, and the other connecting port is connected to the first logic valve. The first control valve allows hydraulic oil to flow forward or reversely, entering or leaving the large chamber of the oil cylinder.

8. The hydraulic control system for the luffing cylinder of a barge crane according to claim 7, characterized in that: It also includes a sixth solenoid valve, one end of which is connected to the large chamber of the oil cylinder, and the other end is connected to the control end of the second control valve. After being energized, the hydraulic oil is passed into the control end of the second control valve to drive the second control valve to switch the valve chamber.

9. A hydraulic control system for a luffing cylinder of a barge crane according to claim 8, characterized in that: The second control valve includes a one-way valve chamber and a control chamber. The one-way valve chamber supplies hydraulic oil from the outlet end of the third logic valve into the large chamber of the oil cylinder. After the sixth solenoid valve is energized, the hydraulic oil enters the control end of the second control valve from the large chamber of the oil cylinder, driving the second control valve to switch to the control chamber, and the control chamber supplies the hydraulic oil in the large chamber of the oil cylinder to leave.

10. A control method for a hydraulic control system of a barge crane luffing cylinder according to claim 1, characterized in that: The following steps are included: When the amplitude is changed to perform the descending action, the hydraulic oil output assembly outputs the hydraulic oil in the oil tank to the P port, the first electromagnetic control valve is electrically switched, and the second logic valve is controlled to be opened in one direction, and the hydraulic oil in the P port enters the first control valve through the second logic valve, and then flows into the small chamber of the oil cylinder to push the oil cylinder piston back; the fourth electromagnetic control valve is electrically switched, and the first logic valve is controlled to be opened, so that the hydraulic oil in the large chamber of the oil cylinder returns to the oil tank through the first logic valve; When the amplitude variation performs the rising action, the second logic valve remains open, the second solenoid control valve is electrically switched to control the third logic valve to open in one direction, and the hydraulic oil at the P port enters the large chamber of the cylinder through the second logic valve and the third logic valve. The cylinder performs the extension action, and the hydraulic oil in the small chamber is pushed out. The first control valve is switched to control the hydraulic oil in the small chamber to flow out in the opposite direction, and the oil from the P port in the second logic valve is merged into the third logic valve and enters the large chamber of the cylinder, thereby realizing the rapid push out of the cylinder.

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