CN213144909U

CN213144909U - Hydraulic system for reducing variable speed impact of walking motor

Info

Publication number: CN213144909U
Application number: CN202021973239.4U
Authority: CN
Inventors: 陈建华; 许盛辉; 林永忠; 陈添贵; 孙赣生
Original assignee: Xiamen Haifu Construction Machinery Co ltd
Current assignee: Xiamen Haifu Construction Machinery Co ltd
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2021-05-07
Anticipated expiration: 2030-09-10

Abstract

A hydraulic system for reducing variable speed impact of a walking motor comprises a bidirectional variable hydraulic motor, a first working oil port connected with an oil port at one end of the bidirectional variable hydraulic motor, and a second working oil port connected with an oil port at the other end of the bidirectional variable hydraulic motor; defining an oil way of the bidirectional variable hydraulic motor connected with the first working oil port as a first oil way, defining an oil way of the bidirectional variable hydraulic motor connected with the second working oil port as a second oil way, and arranging a plurality of branches between the first oil way and the second oil way from the end close to the oil outlet end to the direction far away from the oil outlet end; and a first overflow valve and a second overflow valve are respectively arranged on two branches, the first overflow valve is connected with a first spring piston, the first spring piston is connected with the first oil path, the second overflow valve is connected with a second spring piston, and the second spring piston is connected with the second oil path.

Description

Hydraulic system for reducing variable speed impact of walking motor

Technical Field

The utility model relates to a machinery hydraulic pressure technical field especially relates to a reduce hydraulic system that walking motor variable speed was strikeed.

Background

The bidirectional variable hydraulic motor is generally used on large-scale mechanical equipment, the working inertia of the large-scale mechanical equipment is extremely large, and large impact can be brought to a hydraulic system in the starting and stopping processes of the machine. The two-way variable hydraulic motor cannot brake and needs to be completed by other hydraulic accessories, the most simple and common method is to lock the oil circuit through a hydraulic valve, namely, the oil circuit of an inlet and an outlet of the motor is cut off, and a reverse loop is formed inside the motor by means of the inertia of machinery and flowing liquid after the oil port is cut off.

According to the traditional hydraulic accessory for braking, an overflow valve loop is adopted for braking in an internal oil circuit system, when a reversing valve returns to a middle position, a hydraulic motor becomes a hydraulic pump under the action of inertia, oil is supplied to the overflow valve through a check valve on a high-pressure side, the overflow valve limits impact pressure and enables the motor to brake, and the hydraulic pump can perform self-suction oil supplement from an oil tank through a check valve on a low-pressure side.

But still difficult to solve for the large impacts due to inertia.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a reduce hydraulic system that walking motor variable speed was strikeed, the utility model discloses a realize like this:

a hydraulic system for reducing variable speed impact of a walking motor comprises a bidirectional variable hydraulic motor, a first working oil port connected with an oil port at one end of the bidirectional variable hydraulic motor, and a second working oil port connected with an oil port at the other end of the bidirectional variable hydraulic motor;

an oil way connected with the first working oil port of the bidirectional variable hydraulic motor is defined as a first oil way, an oil way connected with the second working oil port of the bidirectional variable hydraulic motor is defined as a second oil way, and a first branch, a second branch, a first working oil way, a third branch, a fourth branch and a fifth branch are sequentially arranged between the first oil way and the second oil way from the position close to the oil outlet end to the direction far away from the oil outlet end;

and the fourth branch and the fifth branch are respectively provided with a first overflow valve and a second overflow valve, the first overflow valve is connected with a first spring piston, the first spring piston is connected with the first oil way, the second overflow valve is connected with a second spring piston, and the second spring piston is connected with the second oil way.

As a further improvement, a first check valve is arranged between the ports of the first working oil path and the third branch path on the first oil path, and a second check valve is arranged between the ports of the first working oil path and the third branch path on the second oil path.

As a further improvement, an oil inlet of the first check valve is close to the first working oil port, and an oil outlet of the first check valve is far away from the first working oil port; an oil inlet of the second check valve is close to the second working oil port, and an oil outlet of the second check valve is far away from the second working oil port.

As a further improvement, a three-position six-way electromagnetic throttle valve is arranged on the first working oil path, and the three-position six-way electromagnetic throttle valve is connected with the third branch.

As a further improvement, a reversing brake system is arranged between the fifth branch and the two-way variable hydraulic motor.

As a further improvement, the reversing brake system comprises a servo piston connected with the swash plate of the bidirectional variable hydraulic motor and a two-position three-way normally-open direction control valve connected with a rodless cavity of the servo piston through an oil way.

The beneficial effects of the utility model reside in that, through increase spring plunger in the overflow valve position, by pressure oil control plunger stroke, control overflow pressure has prolonged the stroke of the liquid that flows in inside reverse circuit behind the motor braking, the impact force that produces when having reduced the motor braking.

Drawings

Fig. 1 is a schematic view of the hydraulic system of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to the attached drawing fig. 1 of the specification, a hydraulic system for reducing variable speed impact of a walking motor comprises a bidirectional variable hydraulic motor 1, a first working oil port a connected with an oil port at one end of the bidirectional variable hydraulic motor 1, and a second working oil port B connected with an oil port at the other end of the bidirectional variable hydraulic motor 1;

defining an oil way for connecting the bidirectional variable hydraulic motor 1 with the first working oil port A as a first oil way 1A, defining an oil way for connecting the bidirectional variable hydraulic motor 1 with the second working oil port B as a second oil way 1B, and sequentially arranging a first branch 11A, a second branch 11B, a first working oil way 12a, a third branch 11c, a fourth branch 11d and a fifth branch 11e between the first oil way and the second oil way from the end close to the oil outlet end to the direction far away from the oil outlet end;

the fourth branch 11d and the fifth branch 11e are respectively provided with a first overflow valve 111 and a second overflow valve 112, the first overflow valve 111 is connected with a first spring piston 113, the first spring piston 113 is connected with the first oil path 1A, the second overflow valve 112 is connected with a second spring piston 114, and the second spring piston 114 is connected with the second oil path 1B.

As a further modification, a first check valve 121 is provided between the ports of the first hydraulic fluid passage 1A and the third branch passage 11c, and a second check valve 122 is provided between the ports of the second hydraulic fluid passage 1B and the first hydraulic fluid passage 12a and the third branch passage 11 c.

As a further improvement, the oil inlet of the first check valve 121 is close to the first working oil port a, and the oil inlet of the second check valve 122 is close to the second working oil port B.

As a further improvement, a three-position six-way electromagnetic throttle valve 211 is arranged on the first working oil path 12a, and the middle position of the three-position six-way electromagnetic throttle valve 211 is connected with the third branch 11 c.

As a further improvement, a reversing brake system is provided between the fifth branch 11e and the two-way variable hydraulic motor 1.

As a further improvement, the reversing brake system comprises a servo piston 3 connected with a swash plate of the bidirectional variable hydraulic motor 1, and a two-position three-way normally-open direction control valve 4 connected with a rodless cavity of the servo piston through an oil way.

In the normal running process, the A, B ports are oil outlets, and the flow direction of flowing liquid is controlled by check valves arranged at different positions of a hydraulic system oil way; after the motor is braked, the oil way is cut off, a closed loop is formed in the hydraulic system, and flowing liquid continues to act in the hydraulic system by means of inertia until the speed is reduced to zero;

the utility model discloses a spring plunger who links to each other with the oil circuit is newly-increased in the overflow valve position, by pressure oil control piston stroke, control overflow pressure has prolonged the stroke of the mobile liquid in inside reverse circuit behind the motor braking, the impact force that produces when having reduced the motor braking.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic system for reducing variable speed impact of a walking motor is characterized in that: the hydraulic control system comprises a bidirectional variable hydraulic motor (1), a first working oil port (A) connected with an oil port at one end of the bidirectional variable hydraulic motor (1), and a second working oil port (B) connected with an oil port at the other end of the bidirectional variable hydraulic motor (1);

an oil way connecting the two-way variable hydraulic motor (1) and the first working oil port (A) is defined as a first oil way (1A), an oil way connecting the two-way variable hydraulic motor (1) and the second working oil port (B) is defined as a second oil way (1B), and a first branch (11A), a second branch (11B), a first working oil way (12a), a third branch (11c), a fourth branch (11d) and a fifth branch (11e) are sequentially arranged between the first oil way and the second oil way from the end close to the oil outlet end to the direction far away from the oil outlet end;

the fourth branch (11d) and the fifth branch (11e) are respectively provided with a first overflow valve (111) and a second overflow valve (112), the first overflow valve (111) is connected with a first spring piston (113), the first spring piston (113) is connected with the first oil path (1A), the second overflow valve (112) is connected with a second spring piston (114), and the second spring piston (114) is connected with the second oil path (1B).

2. The hydraulic system for reducing variable speed shocks of a travel motor of claim 1, wherein: a first check valve (121) is arranged between ports of the first working oil path (12a) and the third branch path (11c) on the first oil path (1A), and a second check valve (122) is arranged between ports of the first working oil path (12a) and the third branch path (11c) on the second oil path (1B).

3. The hydraulic system for reducing the variable speed impact of the walking motor as recited in claim 2, wherein the oil inlet of the first check valve (121) is close to the first working oil port (a), and the oil inlet of the second check valve (122) is close to the second working oil port (B).

4. The hydraulic system for reducing the variable speed impact of the walking motor as claimed in claim 1, wherein a three-position six-way electromagnetic throttle valve (211) is arranged on the first working oil path (12a), and the middle position of the three-position six-way electromagnetic throttle valve (211) is connected with the third branch (11 c).

5. A hydraulic system for reducing the variable speed shocks of a walking motor as claimed in claim 1, characterised in that a reversing braking system is arranged between the fifth branch (11e) and the bi-directional variable hydraulic motor (1).

6. A hydraulic system for reducing the shocks at varying speeds of a walking motor, according to claim 5, characterized in that said reversing brake system comprises, in connection with the swash-plate of said two-way variable hydraulic motor (1), servo-pistons (3), a two-position three-way normally-open directional control valve (4) connected by an oil circuit to the rodless chambers of said servo-pistons.