Battery monorail hoist hydraulic system

Abstract

The utility model discloses a battery monorail hoist hydraulic system. The battery monorail hoist hydraulic system includes the main pump, and the oil inlet of main pump is connected with the oil tank, and the main pump is connected with the first three four -way electromagnetic reversing valve, and the pressure oil port of first three four -way electromagnetic reversing valve is connected with the oil outlet of main pump, and the oil return port of first three four -way electromagnetic reversing valve is communicated to the oil tank, and one working oil port of first three four -way electromagnetic reversing valve is connected with the hoist loop, and another working oil port is connected with the walking loop. The utility model solves the problem that the prior art is prone to misoperation, and the safety is poor.

Description

Technical Field

[0001] This utility model relates to the field of monorail crane technology, and in particular to a battery-powered monorail crane hydraulic system. Background Technology

[0002] There is a Chinese utility model patent with publication number CN211496640U, entitled "A Hydraulic Control System for a Battery-Powered Monorail Auxiliary Transport Equipment." This hydraulic control system for the battery-powered monorail auxiliary transport equipment includes a piston pump. One end of the piston pump is connected to an oil tank, and the other end is connected to an electromagnetic relief valve, a check valve, a pressure reducing valve, the inlet of an electro-hydraulic spool valve I, and a relief valve. The relief valve is connected to the inlet of an electro-hydraulic spool valve II, and the working port of electro-hydraulic spool valve II is connected to a hydraulic lifting motor. The inlet of electro-hydraulic spool valve I is connected to a travel motor. However, this hydraulic control system for the battery-powered monorail auxiliary transport equipment is prone to misoperation in practice. Specifically, when both electro-hydraulic spool valve I and electro-hydraulic spool valve II are energized, a situation of simultaneous travel and lifting occurs, resulting in poor safety. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a highly safe battery monorail hydraulic system.

[0004] To achieve the above objectives, the technical solution adopted by the hydraulic system of the battery monorail crane of this utility model is as follows:

[0005] A battery-powered monorail hydraulic system includes a main pump, the inlet of which is connected to an oil tank. The main pump is connected to a first three-position four-way solenoid directional valve. The pressure port of the first three-position four-way solenoid directional valve is connected to the outlet of the main pump. The return port of the first three-position four-way solenoid directional valve is connected to the oil tank. One working port of the first three-position four-way solenoid directional valve is connected to a lifting circuit, and the other working port is connected to a traveling circuit.

[0006] Preferably, the lifting circuit includes several parallel second three-position four-way solenoid valves. The pressure port of the second three-position four-way solenoid valve is connected to one of the working ports of the first three-position four-way solenoid valve. The second three-position four-way solenoid valve is connected to a lifting motor. The two working ports of the lifting motor are respectively connected to the two working ports of the second three-position four-way solenoid valve. The return port of the second three-position four-way solenoid valve is connected to the oil tank.

[0007] Preferably, a first overflow valve connected to the oil tank is provided on the oil line that connects the second three-position four-way solenoid valve in parallel with the first three-position four-way solenoid valve.

[0008] Preferably, a first hydraulic lock is provided on the oil line connecting the hoisting motor and the second three-position four-way solenoid directional valve.

[0009] Preferably, the travel circuit includes a third three-position four-way solenoid valve, the pressure port of the third three-position four-way solenoid valve is connected to one of the working ports of the first three-position four-way solenoid valve, one working port of the third three-position four-way solenoid valve is connected to a first oil circuit, and the other working port is connected to a second oil circuit. The third three-position four-way solenoid valve is connected to several pairs of travel motors through the first and second oil circuits.

[0010] Preferably, among the several pairs of travel motors, only one pair is the main travel motor, and the rest are auxiliary travel motors. A two-position three-way solenoid directional valve is installed on the oil line connecting the auxiliary travel motors to the first and second oil lines.

[0011] Preferably, a second hydraulic lock is provided between the first oil circuit and the second oil circuit.

[0012] Preferably, a second overflow valve connected to the oil tank is provided on the oil line where the pressure port of the third three-position four-way solenoid directional valve is connected to one of the working ports of the first three-position four-way solenoid directional valve.

[0013] Preferably, the main pump is a load-sensitive pump.

[0014] Preferably, the first three-position four-way solenoid directional valve is an M-type three-position four-way solenoid directional valve.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] The main pump pumps oil to the hoisting circuit and the traveling circuit separately through the first three-position four-way solenoid directional valve. When the main pump pumps oil to the hoisting circuit, it cuts off the traveling circuit, and when the main pump pumps oil to the traveling circuit, it cuts off the hoisting circuit. This avoids the phenomenon of hoisting while traveling due to misoperation and improves safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the hydraulic system for a battery-powered monorail crane of this utility model.

[0018] Figure 2 This is a diagram showing the working status of the lifting circuit.

[0019] Figure 3 This is a diagram showing the working state of the travel circuit.

[0020] The system includes: 1. Oil tank; 2. Dual pump unit; 21. Main pump; 22. Auxiliary pump; 3. Clamping cylinder; 4. Brake cylinder; 5. First three-position four-way solenoid directional valve; 6. Lifting circuit; 61. Second three-position four-way solenoid directional valve; 62. First relief valve; 63. Lifting motor; 64. First hydraulic lock; 7. Travel circuit; 71. Third three-position four-way solenoid directional valve; 72. Second relief valve; 73. First oil circuit; 74. Second oil circuit; 75. Travel motor; 76. Two-position three-way solenoid directional valve; 77. Second hydraulic lock. Detailed Implementation

[0021] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0022] like Figure 1-3As shown, a battery-powered monorail hydraulic system includes an oil tank 1 and a dual pump assembly 2 mounted on the tank. The dual pump assembly includes a main pump 21 and an auxiliary pump 22 driven by a motor. The main pump is a load-sensitive pump, which is existing technology, and its specific structure will not be described in detail. The load-sensitive pump can achieve zero-displacement start-up to solve the problem of stiff actuator movement in open systems. The auxiliary pump is a gear pump that pumps oil to the clamping cylinder 3 and the brake cylinder 4, respectively. The oil inlet of the main pump is connected to the oil tank. The main pump is connected to a first three-position four-way solenoid directional valve 5. The first three-position four-way solenoid directional valve is an M-type three-position four-way solenoid directional valve. The M-type three-position four-way solenoid directional valve allows the non-working main pump to be in an unloaded state, so the system does not need to continuously maintain pressure, reducing energy consumption and system heat generation, thereby effectively... This extends the service life of the main pump and the entire system. The pressure port (P) of the M-type three-position four-way solenoid directional valve is connected to the outlet port of the main pump, and the return port (T) of the M-type three-position four-way solenoid directional valve is connected to the oil tank. One working port (A) of the M-type three-position four-way solenoid directional valve is connected to the lifting circuit 6. The lifting circuit includes two parallel second three-position four-way solenoid directional valves 61. The second three-position four-way solenoid directional valves are Y-type three-position four-way directional valves. The pressure port (P) of the second three-position four-way solenoid directional valves is connected to the working port A of the M-type three-position four-way solenoid directional valve. After the second three-position four-way solenoid directional valves are connected in parallel, a first relief valve 62 connected to the oil tank is installed on the oil line connected to the M-type three-position four-way solenoid valve to ensure pressure stability in the lifting circuit. A four-way solenoid directional valve connects to a pair of lifting motors 63. The A working port of the lifting motor is connected to the A working port of the second three-position four-way solenoid directional valve, and the B working port of the lifting motor is connected to the B working port of the second three-position four-way solenoid directional valve. A first hydraulic lock 64 is installed on the oil line connecting the lifting motor and the second three-position four-way solenoid directional valve to ensure the safety of lifting operations. The return ports of the two second three-position four-way solenoid directional valves are connected in parallel to the oil tank. The other working port (B) of the M-type three-position four-way solenoid directional valve is connected to the travel circuit 7. The travel circuit includes a third three-position four-way solenoid directional valve 71, which is a Y-type three-position four-way directional valve. The pressure port (P) of the third three-position four-way solenoid directional valve is connected to the M-type three-position four-way solenoid directional valve. The valve's B working port is connected to the oil line where the pressure port (P) of the third three-position four-way solenoid directional valve is connected to the B working port of the M-type three-position four-way solenoid directional valve. A second relief valve 72, connected to the oil tank, is installed to ensure stable pressure in the travel circuit. One working port (A) of the third three-position four-way solenoid directional valve is connected to the first oil line 73, and the other working port (B) is connected to the second oil line 74. The third three-position four-way solenoid directional valve is connected to several pairs of travel motors 75 through the first and second oil lines. Among the pairs of travel motors, only one pair is the main travel motor, and the rest are auxiliary travel motors. A two-position three-way solenoid directional valve 76 is installed on the oil line connecting the auxiliary travel motors to the first and second oil lines for sling drive. A second hydraulic lock 77 is installed between the first and second oil lines.Ensure the monorail crane travels safely and stably.

[0023] The specific working process and principle of this utility model are as follows: During lifting, the clamping cylinder is unlocked, the brake cylinder operates, the lower side of the M-type three-position four-way solenoid valve is energized, and the P and A ports of the M-type three-position four-way solenoid valve are connected. The lower side of the second three-position four-way solenoid valve is also energized, and the P and A ports of the second three-position four-way solenoid valve are connected. The oil drawn by the main pump enters the A working port of the lifting motor, driving the lifting motor to rotate forward and lift the item. After the item is completely lifted, the brake cylinder is unlocked, the clamping cylinder operates, both the upper and lower sides of the second three-position four-way solenoid valve are de-energized, the lifting motor stops working, the upper side of the M-type three-position four-way solenoid valve is energized, and the P and B ports of the M-type three-position four-way solenoid valve are connected. The lower side of the third three-position four-way solenoid valve is energized, and the third three-position four-way solenoid valve... When the P and A ports of the directional control valve are connected, the upper side of the two-position three-way solenoid directional control valve is de-energized. The oil drawn by the main pump enters the A working oil port of the main travel motor and the auxiliary travel motor, causing the main travel motor and the auxiliary travel motor to rotate forward. After the goods are transferred to the destination, the clamping cylinder is unlocked, the brake cylinder is activated, the lower side of the M-type three-position four-way solenoid directional control valve is energized, and the P and A ports of the M-type three-position four-way solenoid directional control valve are connected. The upper side of the second three-position four-way solenoid directional control valve is energized, and the P and B ports of the second three-position four-way solenoid directional control valve are connected. The oil drawn by the main pump enters the B working oil port of the hoisting motor, driving the hoisting motor to reverse and lower the goods. When the monorail is returning, since it is unloaded, the upper side of the two-position three-way solenoid directional control valve can be energized to cut off the oil circuit of the auxiliary travel motor, thereby increasing the return speed. This invention uses an M-type three-position four-way solenoid valve to switch between lifting and walking actions. Lifting cannot be done while walking, and walking cannot be done while lifting, thus avoiding the phenomenon of lifting while walking due to misoperation and improving safety.

Claims

1. A hydraulic system for a battery-powered monorail crane, characterized in that: It includes a main pump, whose inlet is connected to the oil tank. The main pump is connected to a first three-position four-way solenoid directional valve. The pressure port of the first three-position four-way solenoid directional valve is connected to the outlet port of the main pump. The return port of the first three-position four-way solenoid directional valve is connected to the oil tank. One working port of the first three-position four-way solenoid directional valve is connected to a lifting circuit, and the other working port is connected to a traveling circuit.

2. The battery monorail hydraulic system according to claim 1, characterized in that: The lifting circuit includes several parallel second-third-position four-way solenoid directional valves. The pressure port of the second-third-position four-way solenoid directional valve is connected to one of the working ports of the first-third-position four-way solenoid directional valve. The second-third-position four-way solenoid directional valve is connected to a lifting motor. The two working ports of the lifting motor are respectively connected to the two working ports of the second-third-position four-way solenoid directional valve. The return port of the second-third-position four-way solenoid directional valve is connected to the oil tank.

3. The battery monorail hydraulic system according to claim 2, characterized in that: A first overflow valve connected to the oil tank is installed on the oil line that connects the second three-position four-way solenoid directional valve in parallel with the first three-position four-way solenoid directional valve.

4. The battery monorail hydraulic system according to claim 2, characterized in that: A first hydraulic lock is installed on the oil line connecting the hoisting motor and the second three-position four-way solenoid directional valve.

5. The battery monorail hydraulic system according to claim 1, characterized in that: The travel circuit includes a third three-position four-way solenoid valve. The pressure port of the third three-position four-way solenoid valve is connected to one of the working ports of the first three-position four-way solenoid valve. One working port of the third three-position four-way solenoid valve is connected to a first oil circuit, and the other working port is connected to a second oil circuit. The third three-position four-way solenoid valve is connected to several pairs of travel motors through the first and second oil circuits.

6. The battery monorail hydraulic system according to claim 5, characterized in that: Of the several pairs of travel motors, only one pair is the main travel motor, and the rest are auxiliary travel motors. A two-position three-way solenoid directional valve is installed on the oil circuit connecting the auxiliary travel motors to the first and second oil circuits.

7. The battery monorail hydraulic system according to claim 6, characterized in that: A second hydraulic lock is provided between the first oil circuit and the second oil circuit.

8. The battery monorail hydraulic system according to claim 5, characterized in that: A second overflow valve connected to the oil tank is installed on the oil line where the pressure port of the third three-position four-way solenoid directional valve is connected to one of the working ports of the first three-position four-way solenoid directional valve.

9. The battery monorail hydraulic system according to claim 1, characterized in that: The main pump is a load-sensitive pump.

10. The battery monorail hydraulic system according to claim 1, characterized in that: The first three-position four-way solenoid directional valve is a type M three-position four-way solenoid directional valve.

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