CN205012397U - Hydraulic shovel swing arm potential energy recovery system - Google Patents

Abstract

The utility model provides a technical scheme of a hydraulic excavator arm potential energy recovery system, the scheme also includes two main control oil cylinders and an auxiliary oil cylinder for driving the movement of the boom, and the auxiliary oil cylinders are respectively connected in parallel with the two main control oil cylinders Set, the cylinder rods of the two main control cylinders and the cylinder rods of the auxiliary cylinders move synchronously, and the hydraulic pump is connected with the rod cavity, the rodless cavity of the two main control cylinders and the active cylinder of the auxiliary cylinder through the second reversing valve. The rod cavity is communicated, and the rodless cavity of the auxiliary oil cylinder is communicated with the accumulator. Using the utility model, the potential energy of the auxiliary oil cylinder descending can be recovered in the accumulator, and the accumulator releases the stored potential energy when the boom is raised. Compared with the prior art, the whole hydraulic system greatly reduces energy consumption and Heat generation realizes the reuse of energy.

Description

A hydraulic excavator arm potential energy recovery system

technical field

The utility model relates to the field of engineering machinery hydraulic transmission, in particular to a hydraulic excavator arm potential energy recovery system.

Background technique

The hydraulic excavator is a kind of widely used construction machinery. The weight of the working device accounts for about 1/4 of the weight of the whole machine. During the operation of the excavator, the working device must be lifted and lowered once in each operation cycle. When lifting, a large amount of The energy, the potential energy when falling is wasted again. In the prior art, this is the weak point that the prior art exists.

Contents of the invention

The technical problem to be solved by the utility model is to provide a technical scheme of a hydraulic excavator arm potential energy recovery system in view of the deficiencies in the prior art. Using the utility model, the potential energy of the working device can be recovered in the energy storage In the device, the accumulator releases the stored potential energy when the boom rises. Compared with the existing technology, the entire hydraulic system greatly reduces energy consumption, reduces heat generation, and realizes energy reuse.

This solution is realized through the following technical measures: a hydraulic excavator arm potential energy recovery system, including a fuel tank and a hydraulic pump, and also includes two main control oil cylinders and an auxiliary oil cylinder for driving the movement of the boom. The oil cylinders are respectively arranged in parallel with the two main control oil cylinders, the cylinder rods of the two main control oil cylinders and the cylinder rods of the auxiliary oil cylinders move synchronously, and the hydraulic pump communicates with the rod chambers of the two main control oil cylinders through the second reversing valve. , the rodless chamber and the rod chamber of the auxiliary oil cylinder communicate with each other, and the rodless chamber of the auxiliary oil cylinder communicates with the accumulator.

A further improvement of the utility model is that a check valve is arranged between the high-pressure oil chamber and the low-pressure oil chamber of the second reversing valve. Through the one-way valve, the high-pressure oil on the oil return side can be returned to the oil inlet side in a short time, so that the flow rate and speed of the oil inlet side are increased, and the flow regeneration function is realized.

The further improvement of the utility model is that the second reversing valve adopts a three-position six-way reversing valve, the P port and the N port of the second reversing valve are connected with the hydraulic pump, and the second reversing valve The O port of the reversing valve communicates with the fuel tank, the A port of the second reversing valve communicates with the rodless chambers of the two main control cylinders, and the B port of the second reversing valve communicates with the rods of the two main control cylinders. The chamber and the rod chamber of the auxiliary oil cylinder are connected, the M port of the second reversing valve is connected with the inlet of the flow control valve, and the outlet of the flow control valve is connected with the oil tank.

In order to avoid the first use of the accumulator or the reduction of the pressure of the energy storage system due to leakage, a further improvement of the utility model is that the outlet of the hydraulic pump is connected with a first reversing valve with the function of charging and discharging energy, through The movement of the spool of the first reversing valve is controlled so that the accumulator can be charged and discharged.

A further improvement of the utility model is that the first reversing valve adopts a three-position six-way reversing valve, and the P port and the N port of the first reversing valve are both connected with the hydraulic pump. The O port of the first reversing valve communicates with the oil tank, the M port of the first reversing valve communicates with the flow control valve, and the B port of the first reversing valve communicates with the accumulator through the cut-off valve .

A further improvement of the utility model is that the rodless chamber of the auxiliary oil cylinder is directly connected with the accumulator through the oil pipe, that is, no control mechanism is set on the oil pipe, which has the characteristics of high energy recovery rate and quick and efficient action.

A further improvement of the utility model is that the outlet of the hydraulic pump is connected with a relief valve, and the outlet of the relief valve is connected with the oil tank.

A further improvement of the utility model is that the described energy accumulator is a piston type energy accumulator.

The technical characteristics and positive effects of the utility model are:

(1) The utility model includes a fuel tank and a hydraulic pump, and also includes two main control oil cylinders and an auxiliary oil cylinder for driving the movement of the boom. The auxiliary oil cylinders are respectively arranged in parallel with the two main control oil cylinders. The two main control oil cylinders The cylinder rod of the oil cylinder and the cylinder rod of the auxiliary oil cylinder move synchronously. The hydraulic excavator arm of the utility model is driven by a three-cylinder structure. Compared with one oil cylinder or two oil cylinders in the prior art, the pressure required by the main control oil cylinder Compared with the existing technology, it is greatly reduced, thereby saving energy, shortening the lifting time of the boom cylinder, and improving the working efficiency of the whole machine;

(2) The hydraulic pump communicates with the rod chamber and the rodless chamber of the two main control cylinders and the rod chamber of the auxiliary cylinder through the second reversing valve, and the rodless chamber of the auxiliary cylinder communicates with the accumulator, By connecting the rodless cavity of the auxiliary oil cylinder with the accumulator, the potential energy of the auxiliary oil cylinder descending is stored in the accumulator, and when the cylinder rod of the auxiliary oil cylinder rises, the energy stored in the accumulator is released to push the boom up , so that the energy can be reused to achieve the purpose of reducing energy consumption and heat generation; the rodless chamber of the auxiliary cylinder is directly connected to the accumulator, without any control mechanism in the middle, so it has the characteristics of high energy recovery and utilization rate, fast and efficient action ;

(3) A check valve is set between the high-pressure oil chamber and the low-pressure oil chamber of the second reversing valve. The hydraulic oil in the high-pressure oil chamber in the hydraulic system directly enters the low-pressure oil chamber through the check valve, so that the The increased flow increases the speed at which the boom can be lowered.

It can be seen that, compared with the prior art, the utility model has substantive features and progress, and the beneficial effects of its implementation are also obvious.

Description of drawings

Fig. 1 is a schematic structural view of a specific embodiment of the present invention.

In the figure, 1 is the fuel tank, 2 is the hydraulic pump, 3 is the second reversing valve, 4 is the overflow valve, 5 is the accumulator, 6 is the flow control valve, 7 is the main control cylinder, 8 is the auxiliary cylinder, 9 10 is a stop valve, 10 is a first reversing valve, and 11 is a one-way valve.

detailed description

In order to clearly illustrate the technical features of the solution, the solution will be described below through a specific implementation mode combined with the accompanying drawings.

It can be seen from the drawings that a hydraulic excavator boom potential energy recovery system includes a fuel tank 1 and a hydraulic pump 2, and also includes two main control cylinders 7 and an auxiliary cylinder 8 for driving the movement of the boom. Oil cylinders 8 are arranged in parallel with two main control oil cylinders 7 respectively. The cylinder rods of the two main control oil cylinders 7 and the auxiliary oil cylinder 8 move synchronously to jointly control the rise or fall of the boom. The main control oil cylinder 7 is a conventional The hydraulic cylinder, the auxiliary cylinder 8 has the function of energy recovery, and the auxiliary cylinder 8 is located between the two main control cylinders 7 . The hydraulic pump 2 communicates with the rod cavity and the rodless cavity of the two main control cylinders 7 and the rod cavity of the auxiliary cylinder 8 through the second reversing valve 3, and the rodless cavity of the auxiliary cylinder 8 is connected to the accumulator 5 is directly connected through an oil pipe, and there is no control component between the auxiliary oil cylinder 8 and the accumulator 5 .

Because the small chambers of the two main control cylinders 7 and one auxiliary cylinder 8 supply oil at the same time, in order to ensure the lowering speed of the boom, the flow demand in the hydraulic system is relatively large. A check valve 11 is installed between the oil chamber and the low-pressure oil chamber. Through the check valve 11, the high-pressure oil on the oil return side can be returned to the oil inlet side in a short time, so that the flow rate and speed of the oil inlet side are increased, and flow regeneration is realized. Features.

In the utility model, the second reversing valve 3 adopts a three-position six-way reversing valve, and the P port and the N port of the second reversing valve 3 are connected with the hydraulic pump 2, and the second reversing valve The O port of the directional valve 3 communicates with the oil tank 1, the A port of the second directional valve 3 communicates with the rodless cavity of the two main control cylinders 7, and the B port of the second directional valve 3 communicates with the two main control cylinders. The rod cavity of the oil control cylinder 7 and the rod cavity of the auxiliary oil cylinder 8 are communicated. The M port of the second reversing valve 3 is communicated with the flow control valve 6 , and the outlet of the flow control valve 6 is communicated with the oil tank 1 .

The energy storage process of boom lowering: when the pilot handle of the boom is manipulated, the pilot pressure pushes the spool of the second reversing valve 3 to move to the left, at this time, the hydraulic oil output by the hydraulic pump 2 passes through the second reversing valve 3 The P port and B port of the main control cylinder 7 enter the rod chamber of the two main control cylinders 7 and the rod chamber of the auxiliary cylinder 8, so that the boom is lowered, and the hydraulic oil in the rodless chamber of the two main control cylinders 7 passes through the second commutation The A port and O port of the valve 3 flow back to the oil tank 1, and at the same time, the rodless chamber of the auxiliary cylinder 8 communicates with the accumulator 5, and the hydraulic oil in the rodless chamber flows into the accumulator 5, so that the volume of the accumulator 5 becomes smaller , the pressure rises, thereby storing potential energy.

The energy discharge process of boom rising:

When the pilot handle of the boom is manipulated, the pilot pressure pushes the spool of the second reversing valve 3 to move to the right. At this time, the hydraulic oil from the hydraulic pump 2 enters the two ports through the P port and A port of the second reversing valve 3. The hydraulic oil in the rod chamber of two main control cylinders 7 flows back to the oil tank 1 through the B port and O port of the second reversing valve 3, and at the same time, the rodless chamber of the auxiliary oil cylinder 8 The cavity communicates with the accumulator 5, and due to the pressure of the high-pressure gas in the accumulator 5, the cylinder rod of the auxiliary oil cylinder 8 is pushed upward to assist the workmanship. The volume of the gas in the accumulator 5 becomes larger, the pressure decreases, and the energy is released.

In order to prevent the accumulator 5 from being used for the first time or the effect of the accumulator 5 being affected by the pressure drop caused by leakage, etc., the utility model is connected with a first reversing valve 10 at the outlet of the hydraulic pump 2, and the first reversing valve 10 is connected to the outlet of the hydraulic pump 2. The reversing valve 10 and the second reversing valve 3 are arranged in parallel. The first reversing valve 10 adopts a three-position six-way reversing valve, the P port and the N port of the first reversing valve 10 are both connected with the hydraulic pump 2, and the first reversing valve 10 The O port of the first reversing valve 10 communicates with the fuel tank 1, the M port of the first reversing valve 10 communicates with the flow control valve 6, and the B port of the first reversing valve 10 communicates with the accumulator 5 through the stop valve 9. By controlling the movement of the spool of the first reversing valve 10, the energy charging and discharging of the accumulator 5 is realized. Specifically, firstly, the shut-off valve 9 is opened, and the spool of the first reversing valve 10 is manipulated to move to the left. The hydraulic oil output by the hydraulic pump 2 is input to the hydraulic oil side of the accumulator 5 through the P port and the B port of the first reversing valve 10. After reaching the set pressure, the spool of the first reversing valve 10 returns to the neutral position. , close the shut-off valve 9, and the charging ends. The energy discharge process is the opposite, open the reversing valve, manipulate the spool of the first reversing valve 10 to move to the right, and the pressure oil in the accumulator 5 will flow back through the B port and O port of the first reversing valve 10 to The pressure in the fuel tank 1 and the accumulator 5 decreases, and after the energy discharge is completed, the shut-off valve 9 is closed.

The outlet of the hydraulic pump 2 is connected with a relief valve 4, and the outlet of the relief valve 4 is connected with the oil tank 1 for controlling the pressure of the system. The hydraulic pump 2 is a variable displacement pump. What described accumulator 5 adopted is piston type accumulator. Both the first reversing valve 10 and the second reversing valve 3 are electro-hydraulic reversing valves.

Although the specific implementation of the utility model has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the utility model. Those skilled in the art should understand that on the basis of the technical solution of the utility model, those skilled in the art do not need to Various modifications or deformations that can be made with creative efforts are still within the protection scope of the present utility model.

Claims (8)

1. a Hydraulic Excavator's Boom potential energy recovery system, comprise fuel tank and hydraulic pump, it is characterized in that: also comprise two master control oil cylinders for driving swing arm to move and an auxiliary cylinder, described auxiliary cylinder is arranged in parallel with two master control oil cylinders respectively, the cylinder bar of described two master control oil cylinders and the cylinder bar of auxiliary cylinder are synchronized with the movement, described hydraulic pump is communicated with through the rod chamber of the rod chamber of the second reversal valve and two master control oil cylinders, rodless cavity and auxiliary cylinder, and the rodless cavity of described auxiliary cylinder is communicated with accumulator.

2. Hydraulic Excavator's Boom potential energy recovery system according to claim 1, is characterized in that: be provided with one way valve between the high-voltage oil cavity of described second reversal valve and low pressure oil pocket.

3. Hydraulic Excavator's Boom potential energy recovery system according to claim 2, it is characterized in that: what described second reversal valve adopted is three six-way transfer valves, the P mouth of described second reversal valve, N mouth is all communicated with hydraulic pump, the O mouth of described second reversal valve is communicated with fuel tank, the A mouth of described second reversal valve is communicated with the rodless cavity of two master control oil cylinders, the B mouth of described second reversal valve and two master control cylinder rod chambers, the rod chamber of auxiliary cylinder is communicated with, the M mouth of described second reversal valve and the inlet communication of flow control valve, the outlet of described flow control valve is communicated with fuel tank.

4. Hydraulic Excavator's Boom potential energy recovery system according to claim 3, is characterized in that: the outlet of described hydraulic pump has the first reversal valve having and fill energy and exoergic function.

5. Hydraulic Excavator's Boom potential energy recovery system according to claim 4, it is characterized in that: what described first reversal valve adopted is three six-way transfer valves, P mouth, the N mouth of described first reversal valve are all communicated with described hydraulic pump, the O mouth of described first reversal valve is communicated with fuel tank, the M mouth of described first reversal valve is communicated with described flow control valve, and the B mouth of described first reversal valve is communicated with described accumulator through stop valve.

6., according to the arbitrary described Hydraulic Excavator's Boom potential energy recovery system of claim 1-5, it is characterized in that: the rodless cavity of described auxiliary cylinder is directly communicated with by oil pipe with accumulator.

7., according to the arbitrary described Hydraulic Excavator's Boom potential energy recovery system of claim 1-5, it is characterized in that: the exit of described hydraulic pump is communicated with overflow valve, the outlet of this overflow valve is communicated with fuel tank.

8., according to the arbitrary described Hydraulic Excavator's Boom potential energy recovery system of claim 1-5, it is characterized in that: what described accumulator adopted is piston accumulator.