CN205876871U - Automatic actuating system of retrieving and recycling of engineering machine tool revolving stage energy - Google Patents

Abstract

The utility model discloses a drive system for automatically recovering and reusing the energy of an engineering machinery turntable, which has an internal combustion engine, a drive pump, a pilot pump, a multi-way valve, a hydraulic control check valve, a check valve, an overflow valve, and an electromagnetic reversing valve. Valve, hydraulic control reversing valve, shuttle valve, hydraulic accumulator and turntable, etc. Under the control of the rotary operating handle, the turntable performs a working cycle of starting rotation and stopping braking. During this process, due to the inertia of the turntable During the braking process, hydraulic oil with high pressure is generated, which flows into the hydraulic accumulator through the control valve to avoid energy loss; The valves are automatically released to assist the movement of the turntable, thereby reducing the energy loss of the hydraulic pump. Through the turntable drive system provided by the utility model, the energy in the start-up and braking process of the turntable can be recovered and reused, the energy utilization rate can be improved, and the energy consumption can be reduced.

Description

A driving system for automatic energy recovery and reuse of construction machinery turntable

technical field

The utility model relates to the technology in the field of hydraulic control systems, in particular to a drive system for automatically recovering and reusing the energy of a construction machinery turntable.

Background technique

With the development of the global economy, global warming and the energy crisis are becoming more and more serious. Therefore, governments of various countries have put forward new demands in terms of improving energy efficiency, developing new energy sources, saving energy and reducing emissions. Construction machinery plays an important role in national production and construction, but it is also a large energy consumer. Research on energy recovery and reuse in construction machinery has an important and positive effect on improving the efficiency of construction machinery and reducing energy consumption.

During the working process, the construction machinery needs to continuously reciprocate and turn to complete the corresponding work. During this process, the turntable is constantly in the cycle of starting acceleration and stopping braking. In the traditional slewing system, when the turntable starts to accelerate from a standstill, since the turntable is a large inertia system, most of the hydraulic oil provided by the hydraulic pump returns to the oil tank through the overflow safety valve. Only when the speed of the turntable increases, The pressure in the slewing motor chamber decreases, and all the hydraulic oil provided by the hydraulic pump enters the slewing motor to drive the turntable to rotate; when the slewing operating handle returns to the neutral position, the oil circuit between the slewing motor and the multi-way valve is cut off. It continues to rotate with inertia, which causes the pressure in the oil return chamber to rise, exceeding the set pressure of the overflow safety valve and causing overflow. Therefore, during the reciprocating rotation of the turntable for one working cycle, there are four overflow losses, resulting in a large amount of energy consumption and generating a large amount of heat, which seriously affects the safe and stable operation of construction machinery.

At present, the recovery of rotary energy is mainly divided into two types: electric type and hydraulic type. The turntable of the electric energy recovery system is directly driven by the electric motor instead of the hydraulic motor. When decelerating and braking, the braking kinetic energy is converted into electric energy through the electric motor working in generator mode and stored in the battery or super capacitor. However, due to the additional hydraulic motor- Generators and batteries or supercapacitors are costly, complex systems, and not universally adaptable. The hydraulic energy recovery system is divided into two types, one is the energy-saving system based on the secondary regulation circuit, and the other is the energy recovery system based on the hydraulic accumulator. The system based on the secondary regulating circuit has no valve-controlled throttling loss in the main oil circuit, which can greatly improve the efficiency of the slewing system. However, the energy-saving system based on the secondary regulating circuit needs to be equipped with a hydraulic transformer, and the specifications are different, which is easy to increase In addition, the hydraulic transformer technology is not yet mature, and it is difficult to popularize and apply this technology in actual products. The energy recovery system of the turntable based on the hydraulic accumulator has little modification to the original system and the cost is low. However, most of the existing research focuses on the recovery of braking energy, and the recovery of starting energy is limited to the scheme and simulation stage; and various energy recovery and reuse systems based on hydraulic accumulators, although they can automatically recover starting and braking Kinetic energy, but when the energy is reused, it needs to be controlled separately, and it cannot be released automatically according to the working conditions, which increases the difficulty and complexity of the control.

Utility model content

In view of this, the utility model aims at the deficiencies in the prior art, and its main purpose is to provide a drive system for automatic energy recovery and reuse of the turntable of construction machinery, which can automatically recover the overflow generated during the startup and braking of the turntable. Energy, and according to the pressure of the slewing motor and hydraulic accumulator, it is automatically released during the slewing process of the turret, and the auxiliary hydraulic pump completes the drive of the turret, thereby reducing energy consumption, improving the efficiency of the drive system, and effectively avoiding the The large amount of heat generated due to energy loss affects the stability of the hydraulic system.

In order to achieve the above object, the utility model adopts the following technical solutions:

A drive system for automatic energy recovery and reuse of construction machinery turntables, including drive pumps, pilot pumps, rotary operating handles, one-way valves, safety valves, multi-way valves, hydraulic control one-way valves, overflow safety valves, oil replenishment Check valve, rotary motor, reducer, turntable, first shuttle valve, first two-position two-way hydraulic control directional valve, two-position three-way hydraulic control directional valve, second two-position two-way hydraulic control directional valve , second shuttle valve, three-position three-way electromagnetic directional valve, two-position two-way electromagnetic directional valve, electric control system, internal combustion engine, hydraulic accumulator and overflow valve;

The rotary motor is connected with the input shaft of the reducer, and the output shaft of the reducer is connected with the turntable; the drive pump and the pilot pump are coaxially installed with the internal combustion engine, and the oil suction ports of the drive pump and the pilot pump are connected with the fuel tank, and the oil outlet of the drive pump The port is connected with the inlet of the one-way valve, and the outlet of the pilot pump is connected with the oil inlet of the rotary operating handle; one way of the oil outlet of the one-way valve is connected with the safety valve, and the other is connected with the oil inlet of the multi-way valve; the multi-way valve The oil return port is directly connected to the oil tank, and the left and right control oil ports of the multi-way valve are respectively connected to the two oil outlets of the rotary operating handle; the control of the rotary operating handle is controlled by the electric control system; the two oil outlets of the rotary operating handle are respectively Divided into three routes, one is connected with the control oil port of the multi-way valve, the other is connected with the control oil port of the hydraulic control check valve, and the other is connected with an oil inlet of the second shuttle valve; the two oil outlets of the multi-way valve are Symmetrical, each branch is divided into five branches, which are respectively connected with the inlet of the hydraulic control check valve, the overflow safety valve, the outlet of the oil supplement check valve, the oil inlet of the rotary motor and the first shuttle valve; the hydraulic control check valve The control oil port of the control port is connected with the oil outlet of the rotary operating handle, and the oil outlet is divided into three routes, the first route is connected with the outlet of another hydraulic control check valve, and the second route is connected with the outlet of the two-position three-way hydraulic control reversing valve. The inlet is connected, and the third road is connected with the inlet of the first two-position two-way hydraulic control reversing valve; the oil outlet of the overflow safety valve is connected with the fuel tank; the oil inlet of the replenishment check valve is connected with the fuel tank;

The output oil port of the first shuttle valve is connected with the lower control oil port of the first two-position two-way hydraulic control reversing valve; the upper control oil port of the first two-position two-way hydraulic control reversing valve is connected with the The oil inlet of the hydraulic accumulator is connected; the oil outlet of the first two-position two-way hydraulic control reversing valve is connected with the oil inlet of the hydraulic accumulator;

The upper side of the two-position three-way hydraulic control reversing valve is a spring, and the control oil port on the lower side is connected with the oil outlet of the second shuttle valve; the upper side oil port of the two-position three-way hydraulic control reversing valve is connected to the hydraulic pressure The oil port of the accumulator is connected, the oil port on the lower side is connected to the fuel tank, and the oil outlet is connected to the control oil port on the upper side of the second two-position two-way hydraulic control reversing valve;

The lower side of the second two-position two-way hydraulic control reversing valve is a spring, the oil inlet is connected with the upper side oil port of the three-position three-way electromagnetic reversing valve, and the oil outlet is connected with the hydraulic accumulator; The lower oil port of the three-position three-way electromagnetic reversing valve is connected to the oil tank, and the upper and lower electromagnets of the three-position three-way electromagnetic reversing valve are controlled by the electric control system;

One way of the oil inlet of the hydraulic accumulator is connected with the overflow valve, one way is connected with the outlet of the first two-position two-way hydraulic control reversing valve, and one way is connected with the upper side of the first two-position two-way hydraulic control reversing valve The control oil port is connected, one is connected with the outlet of the second 2-position 2-way hydraulic control directional valve, the other is connected with the oil inlet of the 2-position 3-way hydraulic control directional valve, and the other is connected with the outlet of the 2-position 2-way electromagnetic directional control valve. The oil inlet is connected; the electromagnet of the two-position two-way electromagnetic reversing valve is controlled by the electronic control unit;

The control signals of the internal combustion engine, the three-position three-way electromagnetic directional valve, the two-position two-way electromagnetic directional valve, and the rotary operating handle are all controlled by the electric control system.

Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be known from the above technical solutions:

By setting the corresponding hydraulic valve between the swing motor and the hydraulic accumulator, the outlet pressure of the hydraulic pump, the output pressure of the swing operating handle, the pressure of the two chambers of the swing motor and the pressure of the hydraulic accumulator are detected, and the corresponding commutation The valve is in the corresponding working position, connecting different energy flow channels between the slewing motor cavity and the hydraulic accumulator, so that the drive system can realize pressure comparison without installing many pressure sensors, and automatically complete the energy recovery of the slewing drive system and reuse. On the one hand, the energy consumption of the turntable drive system is reduced, and the stability of the drive system operation is enhanced; on the other hand, the control system is simplified and the reliability of the control system is improved.

In order to more clearly illustrate the structural features and effects of the utility model, the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments:

Description of drawings

Fig. 1 is the principle schematic diagram of the startup acceleration process of the preferred embodiment of the present utility model;

Fig. 2 is the working principle schematic diagram when there is no energy recovery and reuse of the preferred embodiment of the utility model;

Fig. 3 is a schematic diagram of the braking energy recovery principle of a preferred embodiment of the present invention;

Fig. 4 is the hydraulic drive system diagram when the turntable of the preferred embodiment of the present invention is at rest;

Fig. 5 is a schematic diagram of the multi-stage energy recovery and reuse working principle of a preferred embodiment of the present invention.

Explanation of the accompanying drawings:

1. Driving pump 2. Pilot pump

3. Rotary operating handle 4. Check valve

5. Safety valve 6. Multi-way valve

71, 72, hydraulic control check valve 81, 82, overflow safety valve

91, 92, Oil supplement check valve 10, Swing motor

11. Reducer 12. Turntable

13. The first shuttle valve 14. The first two-position two-way hydraulic control reversing valve

15. Two-position three-way hydraulic control reversing valve 16. Second two-position two-way hydraulic control reversing valve

17. Second shuttle valve 18. Three-position three-way electromagnetic reversing valve

19. Two-position two-way electromagnetic reversing valve 20. Electric control system

21. Internal combustion engine 22. Hydraulic accumulator

23. Overflow valve

detailed description

Please refer to Fig. 1 to Fig. 5, which shows the specific structure of the preferred embodiment of the present utility model, including drive pump 1, pilot pump 2, rotary operating handle 3, one-way valve 4, safety valve 5, Multi-way valve 6, hydraulic control check valve 71, 72, overflow safety valve 81, 82, oil supply check valve 91, 92, rotary motor 10, reducer 11, turntable 12, first shuttle valve 13, first 2-position 2-way hydraulic control directional valve 14, 2-position 3-way hydraulic control directional valve 15, second 2-position 2-way hydraulic control directional valve 16, second shuttle valve 17, 3-position 3-way electromagnetic directional valve 18 , Two-position two-way electromagnetic reversing valve 19, electric control system 20, internal combustion engine 21, hydraulic accumulator 22 and overflow valve 23.

The rotary motor 10 is connected to the input shaft of the reducer 11, and the output shaft of the reducer 11 is connected to the turntable 12; the driving pump 1 and the pilot pump 2 are coaxially installed with the internal combustion engine 21, and the oil suction ports of the driving pump 1 and the pilot pump 2 are both It communicates with the fuel tank, the oil outlet of the driving pump 1 is connected with the inlet of the one-way valve 4, the outlet of the pilot pump 2 is connected with the oil inlet of the rotary operating handle 3; the oil outlet of the one-way valve 4 is connected with the safety valve 5 all the way , one way is connected with the oil inlet port of the multi-way valve 6; the oil return port of the multi-way valve 6 is directly connected with the oil tank, and the left and right control oil ports of the multi-way valve 6 are respectively connected with the two oil outlet ports of the rotary operation handle 3; the rotary operation The control of the handle 3 is controlled by the electric control system 20; the two oil outlets of the rotary operating handle 3 are divided into three routes, one is connected with the control oil port of the multi-way valve 6, and the other is connected with the control ports of the hydraulic control check valves 71 and 72. The oil port is connected, and one road is connected with an oil inlet of the second shuttle valve 17; the two oil outlets of the multi-way valve 6 are symmetrical, and each road is divided into five branches, which are connected with the inlets of the hydraulic control check valves 71 and 72 respectively. , overflow safety valves 81, 82, the outlets of oil replenishment check valves 91, 92, the oil inlet of the rotary motor 10 and the first shuttle valve 13 are connected; the control oil port of the hydraulic control check valve 71 is connected with the rotary operating handle 3 The oil outlet is connected, and the oil outlet is divided into three routes, the first route is connected with the outlet of another hydraulic control check valve 72, the second route is connected with the inlet of the two-position three-way hydraulic control reversing valve 15, and the third route is connected with the outlet of another hydraulic control check valve 72. The inlets of the first two-position two-way hydraulic control reversing valve 14 are connected; the oil outlets of the overflow safety valves 81, 82 are connected with the fuel tank; the oil inlets of the oil replenishment check valves 91, 92 are connected with the fuel tank.

The output oil port of the first shuttle valve 13 is connected with the lower side control oil port of the first two-position two-way hydraulic control reversing valve 14; the upper side of the first two-position two-way hydraulic control reversing valve 14 controls The oil port is connected with the oil inlet of the hydraulic accumulator 22;

The upper side of the two-position three-way hydraulic control reversing valve 15 is a spring, and the control oil port on the lower side is connected with the oil outlet of the second shuttle valve 17; The oil port is connected with the oil port of the hydraulic accumulator 22, the lower side oil port is connected with the oil tank, and the oil outlet is connected with the control oil port on the upper side of the second two-position two-way hydraulic control reversing valve 16.

The lower side of the second two-position two-way hydraulic control reversing valve 16 is a spring, the oil inlet is connected with the upper side oil port of the three-position three-way electromagnetic reversing valve 18, and the oil outlet is connected with the hydraulic accumulator 22 The lower oil port of the three-position three-way electromagnetic reversing valve 18 is connected to the oil tank, and the upper and lower electromagnets 18a, 18b of the three-position three-way electromagnetic reversing valve 18 are controlled by the electric control system 20 .

The oil inlet of the hydraulic accumulator 22 is connected to the overflow valve 23 one way, connected to the outlet of the first two-position two-way hydraulic control reversing valve 14, and one way is connected to the first two-position two-way hydraulic control reversing valve The upper control oil port of 14 is connected, one way is connected with the outlet of the second two-position two-way hydraulic control reversing valve 16, one way is connected with the oil inlet of two-position three-way hydraulic control reversing valve 15, and one way is connected with the two-position two-way hydraulic control reversing valve 15. The oil inlet of the electromagnetic reversing valve 19 is connected; the electromagnet of the two-position two-way electromagnetic reversing valve 19 is controlled by the electronic control unit.

The control signals of the internal combustion engine 21, the three-position three-way electromagnetic reversing valve 18, the two-position two-way electromagnetic reversing valve 19, and the rotary operating handle 3 are all controlled by the electric control system.

The use of the drive system in this embodiment will be further described below according to the different working stages of the drive system for automatic energy recovery and reuse of the construction machinery turntable in this embodiment.

(1) Start the acceleration phase:

When the rotary operating handle 3 representing the rotary leaves the neutral position (taking the left rotary as an example) and moves to the left, the electric control system 20 energizes the lower electromagnet 18b of the three-position three-way electromagnetic reversing valve 18, and the lower position works; at the same time, the pilot pump 2 The left side of the rotary operating handle 3 outputs high-pressure oil, while the right oil port outputs low-pressure oil; the output high-pressure oil acts on the left side of the multi-way valve 6, the right side of the second shuttle valve 17, and the hydraulic control valves on the left side respectively. The control oil port of check valve 71. The second shuttle valve 17 outputs high-pressure oil to act on the lower side control oil port of the two-position three-way hydraulic control reversing valve 15, so that the lower position of the two-position three-way hydraulic control reversing valve 15 works; the two-position three-way hydraulic control reversing valve The oil port on the right side of 15 communicates with the oil tank, so that the upper control oil circuit pressure of the second two-position two-way hydraulic control reversing valve 16 is zero, and it is in the lower position under the action of the spring force on the lower side; the first shuttle valve 13 The left side communicates with the left cavity of the rotary motor 10 in a high-pressure state, so the high-pressure oil output by the first shuttle valve 13 acts on the lower control oil port of the first two-position two-way hydraulic control reversing valve 14, so that the first two-position two-way Through hydraulic control reversing valve 14 lower positions work. The electromagnet of the two-position two-way electromagnetic reversing valve 19 is not energized, and works in the left position, cutting off the passage between the hydraulic accumulator 22 and other actuators. The control oil ports of the hydraulic control check valves 71 and 72 are connected to the high-pressure oil output by the rotary operating handle 3, allowing the two-way flow of hydraulic oil. The above-mentioned hydraulic control valves maintain the state during the start-up acceleration process, as shown in Fig. 1 .

Since the control oil pressure on the left side of the multi-way valve 6 is higher than the oil pressure on the right side, the multi-way valve 6 changes direction, the drive pump 1 is driven by the internal combustion engine 21, and the output high-pressure oil passes through the check valve 4 from the multi-way valve 6 The left output flows into the left cavity of the rotary motor 10; since the turntable 12 is in a static state at this time, and the rotary table 12 belongs to a large inertia system, the rotary motor 10 is also in a static state, and a large amount of water flows into the left cavity of the rotary motor 10 at this time. The hydraulic oil cannot drive the rotary motor 10 to rotate, but can only flow out by opening the hydraulic control check valve 71 on the left; The lower position and the lower position of the second two-position two-way hydraulic control reversing valve 16 enter the hydraulic accumulator 22 , and the other path enters the hydraulic accumulator 22 through the lower position of the first two-position two-way hydraulic control reversing valve 14 . Since the hydraulic oil output from the hydraulic control check valve 71 is divided into two parts, the system pressure drop can be reduced and the energy recovered by the hydraulic accumulator 22 can be increased.

When the hydraulic force overcomes the inertia of the turntable 12 and pushes the turntable 12 to start turning, the flow flowing into the turning motor 10 gradually increases, while the flow flowing into the hydraulic accumulator 22 gradually decreases. The turntable 12 is in an accelerated rotation state. When the turntable 12 reaches the rated speed, the flow output by the drive pump 1 completely enters the rotary motor 10, and the start-up acceleration process ends.

(2) Energy recovery and reuse stage

Since the hydraulic accumulator 22 absorbs a large amount of energy during the acceleration and rotation phase, the pressure rises; and the rotation motor 10 has completed the acceleration process, and the rotation speed tends to be stable. At this time, the pressure in the cavity of the rotation motor 10 is lower than the pressure in the acceleration phase, that is less than the pressure of the hydraulic accumulator 22 . At this time, under the action of the relatively high pressure of the hydraulic accumulator 22, the first two-position two-way hydraulic control reversing valve 14 works in the upper position to cut off the connection between the left and right circuits; the second shuttle valve 17 outputs high-pressure oil and acts on the two-position The lower control oil port of the three-way hydraulic control reversing valve 15 makes the lower position of the two-position three-way hydraulic control reversing valve 15 work, so that the oil port on the right side of the two-position three-way hydraulic control reversing valve 15 communicates with the fuel tank, and acts on The upper side of the second two-position two-way hydraulic control reversing valve 16 controls the oil port, and the second two-position two-way hydraulic control reversing valve 16 is in the lower position under the action of the lower side spring; the three-position three-way electromagnetic reversing valve 18 is still Keep working next. The control oil ports of the hydraulic control check valves 71 and 72 are connected to the high-pressure oil output by the rotary operating handle 3, allowing the two-way flow of hydraulic oil.

At this time, because the pressure in the hydraulic accumulator 22 is relatively high, the pressure oil in the hydraulic accumulator 22 enters the lower position of the three-position three-way electromagnetic selector valve 18 through the lower position of the second two-position two-way hydraulic control selector valve 16. The lower position flows out reversely through the left side hydraulic control check valves 71 and 72, and enters the left chamber of the swing motor 10. Together with the hydraulic oil provided by the drive pump 1, it provides a large flow rate for the swing motor 10, ensuring the turntable 12 to move quickly. run. Since the hydraulic accumulator 22 provides a part of the flow required by the rotary motor 10, the output of the driving pump 1 is reduced, and the energy consumption of the system is reduced.

During the acceleration of the turntable 12 from startup to normal operation, it relies on the pressure of the hydraulic accumulator 22 and the rotary motor 10 to automatically switch without manual operation, which improves the efficiency and reliability of energy recovery and reuse, and simplifies control flow.

(3) Braking energy recovery

After the rotary operating handle 3 returns to the neutral position, the rotary operating handle 3 cuts off the external output of the pilot pump 2, and the two pilot output oil ports of the rotary operating handle 3 communicate with the oil tank. Therefore, the multi-way valve 6 returns to the neutral position under the control of the pilot oil circuits on both sides, cutting off the passage between the drive pump 1 and the cavity of the swing motor 10, and also cutting off the connection passage between the other side of the swing motor 10 and the oil tank; the second shuttle The pressure on both sides of the valve 17 is zero, and the output pressure is also zero; the control oil ports of the hydraulic control check valves 71 and 72 are connected to low-pressure oil, and the reverse flow is prohibited, and they can only maintain the forward flow like ordinary check valves. .

Since the output of the second shuttle valve 17 is zero, the two-position three-way hydraulic control reversing valve 15 is in the upper position under the action of the upper spring force, so that the hydraulic oil in the hydraulic accumulator 22 acts on the second two-position The upper side of the two-way hydraulic control reversing valve 16 controls the oil port, so that the second two-position two-way hydraulic control reversing valve 16 works in the upper position, and cuts off the left and right oil circuits.

Since the turntable 12 is a large inertial load, when the drive pump 1 stops supplying oil to the rotary motor 10, the turntable 12 continues to run in the original direction, compressing the oil in the motor cavity on the right side of the oil tank, which causes a lot of pressure. High pressure, the high-pressure oil opens the hydraulic control check valve 72 on the right side, and flows out from the positive direction of the hydraulic control check valve 72. Due to the high pressure in the right chamber of the motor, the first shuttle valve 13 outputs high-pressure oil to act on the lower control oil port of the first two-position two-way hydraulic control reversing valve 14, prompting the first two-position two-way hydraulic control reversing valve to The lower position of 14 works and communicates with the left and right oil circuits; therefore, the high-pressure oil output from the brake chamber of the swing motor 10 flows into the hydraulic accumulator through the hydraulic control check valve 72 on the right and then through the first two position two way hydraulic control reversing valve 14. energy device 22, so as to realize the recovery of braking energy.

(4) The turntable is at rest

When the rotating speed of the swing motor 10 approaches zero, the pressure in the brake cavity of the swing motor 10 decreases, which is not enough to overcome the pressure in the hydraulic accumulator 22; Output low-pressure oil; at this time, the pressure of the hydraulic accumulator 22 is higher than the pressure of the first shuttle valve 13, so the first two-position two-way hydraulic control reversing valve 14 is in the upper position under the action of the hydraulic accumulator 22, cutting off the left and right oil. The passage of the road; the output pressure of the second shuttle valve 17 is lower than the spring force on the upper side of the two-position three-way hydraulic control directional valve 15, so the upper position of the two-position three-way hydraulic control directional valve 15 works under the action of the spring force , so that the high-pressure oil of the hydraulic accumulator 22 acts on the upper control oil port of the second two-position two-way hydraulic control reversing valve 16, and the second two-position two-way hydraulic control reversing valve 16 is in the position of The upper position works to disconnect the oil circuits on the left and right sides; the three-position three-way electromagnetic reversing valve 18 is under the action of the electric control system 20, the upper electromagnet is energized, and the upper position works so that the oil port on the right side communicates with the fuel tank .

When the hydraulic valves of the drive system were in the above working conditions, the left cavity of the rotary motor 10 sucked oil from the oil tank through the check valve 4 and kept at a lower pressure; the right cavity of the rotary motor 10 passed the right hydraulic control check valve 72 and The upper position of the three-position three-way electromagnetic reversing valve 18 communicates with the oil tank, and also maintains a lower pressure; in this way, the pressure in the two chambers of the rotary motor 10 is equal, which can effectively prevent the reverse rotation of the turntable 12 after it stops, and ensure the stability of the turntable 12. .

(5) Multi-level energy recovery and reuse

When the pressure of the hydraulic accumulator 22 is at the upper limit of the set pressure range, if the turntable 12 performs actions such as starting acceleration or braking at this time, the starting overflow and brake overflow energy cannot be absorbed by the hydraulic accumulator 22 , thus causing waste, in view of this problem, the utility model designs a passage, through the two-position two-way electromagnetic reversing valve 19, this part of energy is provided to other actuators or stored in other hydraulic accumulators with a higher pressure range , to realize the direct use of energy or multi-level energy storage and reuse.

Figure 5 shows the relationship of energy circulation when the turntable 12 starts to start. The working principle is similar to that in Figure 2, except that the starting overflow energy does not enter the hydraulic accumulator 22 at this time, but passes through the two-position two-way electromagnetic reversing valve. 19 into other actuators or other hydraulic accumulators with higher pressure levels; braking energy recovery is similar to this and can be obtained with reference to Fig. 3 and Fig. 5 .

The key point of the design of this utility model is: by setting a corresponding hydraulic valve between the rotary motor and the hydraulic accumulator, to detect the outlet pressure of the hydraulic pump, the output pressure of the rotary operating handle, the pressure of the two chambers of the rotary motor and the pressure of the hydraulic accumulator. pressure, and make the corresponding reversing valve in the corresponding working position, and connect the different energy flow channels between the rotary motor cavity and the hydraulic accumulator, so that the drive system can realize the comparison of pressure without installing many pressure sensors, and automatically Complete the energy recovery and reuse of the slewing drive system. On the one hand, the energy consumption of the turntable drive system is reduced, and the stability of the drive system operation is enhanced; on the other hand, the control system is simplified and the reliability of the control system is improved.

The above are only preferred embodiments of the present utility model, and do not limit the technical scope of the present utility model, so any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model , all still belong to the scope of the technical solution of the utility model.

Claims (1)

1. the drive system that an engineering machinery turntable energy recycles automatically, it is characterised in that: include driving pump, elder generation Lead pump, revolution operation handle, check valve, relief valve, banked direction control valves, hydraulic control one-way valve, overflow relief valve, repairing check valve, revolution Motor, decelerator, turntable, the first shuttle valve, the first two-position two-way hydraulic control reversal valve, two-position three way pilot operated directional control valve, the two or two Two-way pilot operated directional control valve, the second shuttle valve, 3-position-3-way solenoid directional control valve, bi-bit bi-pass solenoid directional control valve, electric-control system, internal combustion Machine, hydraulic accumulator and overflow valve；

Described rotary motor is connected with the power shaft of decelerator, and the output shaft of decelerator is connected with turntable, drives pump and pioneer pump It is co-axially mounted with internal combustion engine, drives the inlet port of pump and pioneer pump all to communicate with fuel tank, drive oil-out and the check valve of pump Entrance communicates, and guide's delivery side of pump is connected with the oil-in of revolution operation handle；Oil-out one tunnel and the relief valve phase of check valve Even, a road is connected with the oil-in of banked direction control valves；Banked direction control valves oil return opening is directly connected with fuel tank, and the left and right control port of banked direction control valves divides Not two oil-outs with revolution operation handle are connected；The control of revolution operation handle is by electric control system controls；Revolution manipulator Two oil-outs of handle divide three tunnels, a road to be connected with the control port of banked direction control valves respectively, and a road is oily with the control of hydraulic control one-way valve Mouth is connected, and a road is connected with an oil-in of the second shuttle valve；The two-way oil-out of banked direction control valves is symmetrical, each point five, every road Road, respectively with the entrance of hydraulic control one-way valve, overflow relief valve, the outlet of repairing check valve, rotary motor oil-in and first Shuttle valve is connected；The control port of hydraulic control one-way valve is connected with the oil-out of revolution operation handle, and oil-out divides three tunnels, the first via and The outlet of another hydraulic control one-way valve is connected, and the second tunnel is connected with the entrance of two-position three way pilot operated directional control valve, the 3rd tunnel and the one or two The entrance of position two-way pilot operated directional control valve is connected；The oil-out of overflow relief valve is connected with fuel tank；The oil-in of repairing check valve with Fuel tank is connected；

The output oil port of described first shuttle valve and the downside control port of the first two-position two-way hydraulic control reversal valve are connected；Described first The upside control port of two-position two-way hydraulic control reversal valve is connected with the oil-in of hydraulic accumulator；First two-position two-way hydraulic control commutation The oil-out of valve is connected with the oil-in of hydraulic accumulator；

The upside of described two-position three way pilot operated directional control valve is spring, and the control port of downside is connected with the oil-out of the second shuttle valve； The upside hydraulic fluid port of two-position three way pilot operated directional control valve is connected with the hydraulic fluid port of hydraulic accumulator, and downside hydraulic fluid port is connected with fuel tank, oil-out It is connected with the control port on the upside of the second two-position two-way hydraulic control reversal valve；

The downside of described second two-position two-way hydraulic control reversal valve is spring, and oil-in is oily with the upside of 3-position-3-way solenoid directional control valve Mouth is connected, and oil-out is connected with hydraulic accumulator；The downside hydraulic fluid port of described 3-position-3-way solenoid directional control valve is connected with fuel tank, three The power-on and power-off Magnet of three-way solenoid valve is by electric control system controls；

Oil-in one tunnel of described hydraulic accumulator is connected with overflow valve, a road and the outlet of the first two-position two-way hydraulic control reversal valve Being connected, a road is connected with the upside control port of the first two-position two-way hydraulic control reversal valve, and a road is changed with the second two-position two-way hydraulic control Being connected to the outlet of valve, a road is connected with the oil-in of two-position three way pilot operated directional control valve, a road and bi-bit bi-pass solenoid directional control valve Oil-in be connected；The electric magnet of described bi-bit bi-pass solenoid directional control valve is by ECU control；

Described internal combustion engine, 3-position-3-way solenoid directional control valve, bi-bit bi-pass solenoid directional control valve, revolution operation handle control signal equal By electric control system controls.