CN210623231U

CN210623231U - Hydraulic pressure slewer buffer system

Info

Publication number: CN210623231U
Application number: CN201921657061.XU
Authority: CN
Inventors: 路小江; 葛永鑫
Original assignee: NINGBO ZHONGYI HYDRAULIC MOTOR CO Ltd
Current assignee: NINGBO ZHONGYI HYDRAULIC MOTOR CO Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-05-26
Anticipated expiration: 2029-09-30

Abstract

The utility model discloses a hydraulic pressure slewer buffer system, including hydraulic motor, switching-over valve and stopper, the switching-over valve is used for controlling hydraulic motor rotation direction, and the corresponding interface connection of switching-over valve and hydraulic motor forms the oil return oil circuit, and the stopper is used for hydraulic motor's braking, has established ties first balanced valve and second balanced valve on the oil circuit X, Y respectively, and the K mouth and the oil circuit X of first balanced valve are connected, and the K mouth and the oil circuit Y of second balanced valve are connected; the buffer system also comprises a shuttle valve, a first buffer overflow valve and a second buffer overflow valve, the shuttle valve is arranged in parallel with the reversing valve, an oil outlet of the shuttle valve is connected with an oil inlet of the brake, and a one-way throttle valve is connected between the shuttle valve and the brake; the first buffer overflow valve and the second buffer overflow valve are both arranged in parallel with the hydraulic motor. The utility model discloses possess simple structure, buffering effectual and the stable advantage of oil circuit.

Description

Hydraulic pressure slewer buffer system

Technical Field

The utility model belongs to the technical field of hydraulic control, in particular to hydraulic pressure slewer buffer system.

Background

In the hydraulic rotary equipment of engineering machinery, such as hoisting equipment, excavators, overhead working trucks and the like, the working mode is that the hydraulic rotary equipment is hydraulically controlled to rotate in the positive and negative directions, the device is controlled to brake by a brake, and a normally closed multi-disc brake is usually adopted in the prior art. However, the brake will be impacted in different degrees due to inertia in the braking moment, so that the service performance or service condition of the equipment is seriously threatened, and therefore how to eliminate or mitigate the inertia impact brought by braking becomes a problem that needs to be solved in the industry at present. In the prior art, a high-pressure shuttle valve is arranged between oil ports of a slewing device, and a one-way overflow valve and other measures are arranged in the slewing device, so that the time delay braking function of the slewing device is realized, for example, a hydraulic slewing device time delay braking system disclosed in the Chinese patent application No. CN201210509827.6 has the advantages that although the cost is effectively controlled, the structure is complex, more parts are involved, the installation difficulty is increased, inconvenience is brought to production, the buffering effect is poor, a braking oil path is unstable, and the slewing device is very easy to damage.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to prior art's defect and not enough, provide a hydraulic pressure slewer buffer system, possess simple structure, buffering effectual and the stable advantage of oil circuit.

The utility model provides a technical scheme that its technical problem adopted is: a hydraulic slewing device buffer system comprises a hydraulic motor, a reversing valve and a brake, wherein the reversing valve is used for controlling the rotation direction of the hydraulic motor, an oil supply P port of the reversing valve is connected with an oil pump, an oil return T port is connected with an oil tank, a working A port is connected with a working A port of the hydraulic motor through an oil way X, a working B port is connected with a working B port of the hydraulic motor through an oil way Y, the brake is used for braking the hydraulic motor, an oil return port of the brake is connected with the oil tank, the hydraulic motor is connected with the oil tank through a pressure relief O port, a first balance valve and a second balance valve are respectively connected in series on an oil way X, Y, a K port of the first balance valve is connected with the oil way X, and a K port of the second balance valve is connected with the oil way Y; the buffer system further comprises a shuttle valve, a first buffer overflow valve and a second buffer overflow valve, the shuttle valve is connected with the reversing valve in parallel, an oil outlet of the shuttle valve is connected with an oil inlet of the brake, and a one-way throttle valve is connected between the shuttle valve and the brake; the first buffer overflow valve and the second buffer overflow valve are both arranged in parallel with the hydraulic motor, a working A port of the first buffer overflow valve is connected with a working A port of the hydraulic motor, a working B port of the first buffer overflow valve is connected with a working B port of the hydraulic motor, a working A port of the second buffer overflow valve is connected with a working B port of the hydraulic motor, and a working B port of the second buffer overflow valve is connected with a working A port of the hydraulic motor.

Furthermore, the reversing valve is a three-position four-way electromagnetic reversing valve, so that reversing and control are facilitated.

Further, the shuttle valve is an or gate type shuttle valve, and two oil inlets of the shuttle valve are respectively connected with the oil passage X, Y.

Furthermore, the one-way throttle valve is a fixed type damping, and the stability is improved.

The utility model has the advantages that: the first balance valve and the second balance valve are respectively connected in series on the oil path X, Y, a K port of the first balance valve is connected with the oil path X, a K port of the second balance valve is connected with the oil path Y, and when oil meets speed change, the oil is adjusted through throttling ports in the two balance valves, so that the balance of the oil path is ensured, and the stability of the rotary device is ensured; the brake realizes delayed closing through the throttling function of the one-way throttle valve, and meanwhile realizes the braking function through the back pressure generated after the closing of the balance valve, the buffer overflow valve starts to work, the overflow pressure before the brake is closed is ensured to gradually rise, the rapid change of oil pressure is avoided, the buffer effect is better, the stability of a brake oil path is ensured, and the hydraulic rotary device is protected from being damaged easily; generally, the utility model discloses possess simple structure, effectual and the stable advantage of oil circuit of buffering.

Drawings

Fig. 1 is a schematic view of the working principle structure of the present invention.

Shown in the figure: 1-a hydraulic motor; 2-a reversing valve; 3-a brake; 4-a first counter-balance valve; 5-a second counter-balance valve; 6-shuttle valve; 7-a first buffer overflow valve; 8-a second buffer overflow valve; 9-one-way throttle valve.

Detailed Description

For a more intuitive and complete understanding of the technical solution of the present invention, the following non-limiting characteristic description is now performed by combining the drawings of the present invention:

as shown in fig. 1, a buffer system of a hydraulic slewing device comprises a hydraulic motor 1, a reversing valve 2 and a brake 3, wherein the reversing valve 2 is used for controlling the rotation direction of the hydraulic motor 1, an oil supply P port of the reversing valve 2 is connected with an oil pump, an oil return T port is connected with an oil tank, a working a port is connected with a working a1 port of the hydraulic motor 1 through an oil path X, a working B port is connected with a working B1 port of the hydraulic motor 1 through an oil path Y, the brake 3 is used for braking the hydraulic motor 1, an oil return port of the brake 3 is connected with the oil tank, the hydraulic motor 1 is connected with the oil tank through a pressure relief O port, a first balance valve 4 and a second balance valve 5 are respectively connected in series on an oil path X, Y, a K port of the first balance valve 4 is connected with the oil path X, and a K port of the second balance; the buffer system also comprises a shuttle valve 6, a first buffer overflow valve 7 and a second buffer overflow valve 8, the shuttle valve 6 is connected with the reversing valve 2 in parallel, an oil outlet of the shuttle valve 6 is connected with an oil inlet of the brake 3, and a one-way throttle valve 9 is connected between the shuttle valve 6 and the brake 3; the first buffer overflow valve 7 and the second buffer overflow valve 8 are both arranged in parallel with the hydraulic motor 1, a working A port of the first buffer overflow valve 7 is connected with a working A1 port of the hydraulic motor 1, a working B port of the first buffer overflow valve is connected with a working B1 port of the hydraulic motor 1, a working A port of the second buffer overflow valve 8 is connected with a working B1 port of the hydraulic motor 1, and a working B port of the second buffer overflow valve is connected with a working A1 port of the hydraulic motor 1.

Preferably, the reversing valve 2 is a three-position four-way electromagnetic reversing valve; the shuttle valve 6 is an OR gate type shuttle valve, and two oil inlets of the shuttle valve 6 are respectively connected with the oil path X, Y; the one-way throttle valve 9 is a fixed type damping, so that the stability of an oil path is improved, and the pressure release is mainly delayed, so that the friction plate is not braked too fast.

Specifically, the first balance valve 4 and the second balance valve 5 are both formed by combining an overflow valve and a check valve. The back pressure is mainly established in a loop pipeline, so that the hydraulic motor 1 can move stably when the load changes, the hydraulic motor is prevented from flying, but the hydraulic motor is in a closed state after an oil path is cut off.

The K ports of the two balance valves are connected with corresponding oil passages, and when the hydraulic motor 1 stops, the corresponding balance valves can be quickly closed.

The two buffer overflow valves not only play a role in overload protection, but also gradually build overflow pressure from small to large at the moment of starting and stopping, so that the oil pressure is ensured to be changed slowly instead of instantaneously, the buffer effect is ensured, and the time of the pressure change process is adjustable and is generally 0.5S-1S.

When the system works, pressure oil enters from the X oil path and is divided into two paths, one path of the pressure oil passes through the one-way valve in the second balance valve 5 and enters from a working A1 port of the hydraulic motor 1, the first buffer overflow valve 7 on the bypass works to ensure that the oil inlet pressure is slowly built within 0.5-1S, the other path of the pressure oil passes through the shuttle valve 6 and the one-way throttle valve 9 in sequence and enters the brake 3 to open a brake friction plate, meanwhile, oil liquid at a working B1 port of the hydraulic motor 1 returns, flows to the Y oil path through the first balance valve 4 and finally flows back to the reversing valve 2, so that the whole oil path is smooth, the slewing mechanism normally works, and the starting is stable. If meet the overload operating mode in the working process, first buffering overflow valve 7 off-load, hydraulic motor 1 stop work plays overload protection effect, when meeting speed variation in addition, the stationarity of gyration speed is guaranteed through the regulation of inside choke to second balanced valve 5. When a hydraulic system is closed or the reversing valve 2 is operated to a middle position, pressure oil in an X oil way disappears instantly, stable braking is not guaranteed, the brake 3 is closed in a delayed mode through the throttling function of the one-way throttle valve 9, meanwhile, the braking function is achieved through back pressure generated after the first balance valve 4 is closed, at the moment, pressure in a Y oil way rises instantly, the buffer overflow valve 7 starts to work, the pressure in the Y oil way is guaranteed to rise gradually from 2MPa to set overflow pressure before the brake 3 is closed, accordingly, stability of a braking oil way is guaranteed, and the oil pressure motor 1 is protected from being damaged difficultly; similarly, when pressure oil enters from the Y oil path, the X oil path serves as an oil return path, the second buffer overflow valve 8 operates, and other principles are as described above, so that the buffer system can achieve a better buffer effect when the hydraulic motor 1 rotates forwards or backwards.

The above is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the claims of the present invention.

Claims

1. The utility model provides a hydraulic pressure slewer buffer system, includes hydraulic motor (1), switching-over valve (2) and stopper (3), switching-over valve (2) are used for control hydraulic motor (1) direction of rotation, the fuel feeding P mouth and the oil pump connection of switching-over valve (2), return oil T mouth and oil tank are connected, work A mouth passes through oil circuit X and is connected with the work A1 mouth of hydraulic motor (1), work B mouth passes through oil circuit Y and is connected with the work B1 mouth of hydraulic motor (1), stopper (3) are used for the braking of hydraulic motor (1), the return oil mouth and the oil tank of stopper (3) are connected, hydraulic motor (1) are connected its characterized in that through pressure release O mouth and oil tank:

a first balance valve (4) and a second balance valve (5) are respectively connected in series on the oil path X, Y, a port K of the first balance valve (4) is connected with the oil path X, and a port K of the second balance valve (5) is connected with the oil path Y;

the buffer system further comprises a shuttle valve (6), a first buffer overflow valve (7) and a second buffer overflow valve (8), the shuttle valve (6) and the reversing valve (2) are arranged in parallel, an oil outlet of the shuttle valve (6) is connected with an oil inlet of the brake (3), and a one-way throttle valve (9) is connected between the shuttle valve (6) and the brake (3);

the hydraulic motor is characterized in that the first buffer overflow valve (7) and the second buffer overflow valve (8) are both arranged in parallel with the hydraulic motor (1), a working A port of the first buffer overflow valve (7) is connected with a working A1 port of the hydraulic motor (1), a working B port of the first buffer overflow valve is connected with a working B1 port of the hydraulic motor (1), a working A port of the second buffer overflow valve (8) is connected with a working B1 port of the hydraulic motor (1), and a working B port of the second buffer overflow valve is connected with a working A1 port of the hydraulic motor (1).

2. A hydraulic swing device damping system according to claim 1, wherein: the reversing valve (2) is a three-position four-way electromagnetic reversing valve.

3. A hydraulic swing device damping system according to claim 1, wherein: the shuttle valve (6) is an OR gate type shuttle valve, and two oil inlets of the shuttle valve (6) are respectively connected with the oil passage X, Y.

4. A hydraulic swing device damping system according to claim 1, wherein: the one-way throttle valve (9) is a fixed type damper.