CN204628143U - A kind of hydraulic system controlling spreading machine material conveying - Google Patents

Abstract

A hydraulic system for controlling material delivery of a paver, characterized in that: it is composed of a first oil circuit system and a second oil circuit system, and the two oil circuit systems share a fuel tank T; the first oil circuit system, the oil source P It is connected to the inlet of the first electromagnetic reversing valve, the two outlets of the first electromagnetic reversing valve are connected to the first hydraulic motor, the outlet of the first electromagnetic reversing valve is connected to the oil tank T, the first overflow valve, the first liquid The control reversing valve is connected in parallel to the inlet and outlet of the first electromagnetic reversing valve, and the first pressure compensation valve is connected in parallel to the inlet and outlet of the first electromagnetic reversing valve after being connected in series with the first flow regulating valve; The connection mode of the second oil circuit and the first oil circuit is exactly the same except that the oil source is different. This design can not only realize the forward and reverse function of the feeding device; but also can effectively absorb the system pressure shock caused by the feeding jam; and according to the system requirements, the feeding can be effectively adjusted through manual adjustment of the flow rate or electric proportional adjustment. speed.

Description

A Hydraulic System for Controlling Material Delivery of Paver

technical field

The design relates to a hydraulic system for controlling material feeding of a paver, which belongs to the technical field of engineering machinery hydraulics.

Background technique

At present, the conveying system of paver mostly adopts the hydraulic system, because of its simple control and convenient use, and the reverse control of the hydraulic system can drive the conveying device to reverse to automatically release the conveying caused by various factors in the construction. Stuck problem, which has been favored by the majority of users.

Although the existing paver conveying hydraulic system can change the forward and reverse drive of the hydraulic pump to the hydraulic motor through the adjustment of the hydraulic reversing valve to realize the forward and reverse function of conveying materials, but if the paver conveys in normal construction When the material device is stuck, the hydraulic system will overshoot the system pressure due to the sudden stop of the material conveying device, especially when the base road is paved, this phenomenon will be particularly serious, resulting in The continuous impact of components such as hydraulic pumps, motors, control valves, and conveyor belts will affect the service life of the conveyor control system. In another case, when the multi-functional paver is used in different construction conditions, different feeding speeds are required to match the material distribution capacity. However, the current conveying hydraulic system is usually controlled by a switch, which cannot realize the adjustment of the speed; or the existing technology uses proportional control to realize the adjustment of the conveying speed, but the existing proportional control technology will greatly increase the system cost.

The Chinese Utility Model Patent No. 201020518474.2 discloses a hydraulic device for controlling the forward and reverse feeding of paver. The forward and reverse function of the material, the system pressure is limited by the ordinary relief valve for system safety protection, but the system cannot adjust the material delivery speed, and the system pressure impact caused by the stuck failure of the delivery device cannot be avoided. impact on lifespan.

Contents of the invention

Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a system pressure overshoot that can eliminate the overshoot of the system pressure and protect the impact of pressure shock on the conveying system when a stuck fault occurs in the conveying device; In construction conditions, the conveying speed can be effectively adjusted by manual flow adjustment or electric proportional adjustment.

In order to achieve the above purpose, this design is realized through the following technical means:

A hydraulic system for controlling material delivery of a paver, characterized in that it is composed of a first oil circuit system and a second oil circuit system, and the first oil circuit system and the second oil circuit system are connected through the same oil return channel to tank T;

The first oil circuit system consists of an oil source P, an oil tank T, a first overflow valve, a first hydraulically controlled reversing valve, a first flow regulating valve, a first pressure compensation valve, a first electromagnetic reversing valve, a first Composition of hydraulic motor;

The second oil circuit system consists of an oil source P', an oil tank T, a second overflow valve, a second hydraulically controlled reversing valve, a second flow regulating valve, a second pressure compensation valve, a second electromagnetic reversing valve and, Composition of the second hydraulic motor;

In the first oil circuit system, the oil source P is connected to the inlet of the first electromagnetic reversing valve, the two outlets of the first electromagnetic reversing valve are connected to the first hydraulic motor, and the outlet of the first electromagnetic reversing valve is connected to the oil tank T connection, the first relief valve and the first hydraulic control valve are connected in parallel to the inlet and outlet of the first electromagnetic directional valve, and the first pressure compensation valve and the first flow regulating valve are connected in parallel to the first electromagnetic directional valve To the inlet and outlet ends of the valve;

In the second oil circuit system, the oil source P' is connected to the inlet of the second electromagnetic reversing valve, the two outlets of the second electromagnetic reversing valve are connected to the second hydraulic motor, and the outlet of the second electromagnetic reversing valve is connected to the oil tank T connection, the second overflow valve and the second hydraulic control reversing valve are connected in parallel to the inlet and outlet of the second electromagnetic reversing valve, and the second pressure compensation valve and the second flow regulating valve are connected in parallel to the second electromagnetic reversing valve The inlet and outlet ends of the reversing valve.

further:

The hydraulic system for controlling material delivery of a paver is characterized in that: the first flow regulating valve and the second flow regulating valve are electric proportional throttle valves.

The hydraulic system for controlling material delivery of a paver is characterized in that: the first flow regulating valve and the second flow regulating valve are manually adjustable flow valves.

The hydraulic system for controlling material delivery of a paver is characterized in that: the first hydraulically controlled directional valve and the second hydraulically controlled directional valve are in the normal position and are check valves with an oil replenishment function, The reversing position is a throttle valve with throttling function.

The hydraulic system for controlling material delivery of a paver is characterized in that: the reversing pressures of the first hydraulic control valve and the second hydraulic control valve are respectively lower than those of the first overflow valve , The set pressure of the second relief valve.

The hydraulic system for controlling the conveying of paver is characterized in that: the first electromagnetic reversing valve and the second electromagnetic reversing valve are three-position four-way electromagnetic reversing valves with a central function of H type .

The beneficial effects of the present invention are: this design can not only realize the forward and reverse function of the feeding device; but also can effectively absorb the system pressure impact caused by the feeding jam; Proportional adjustment effectively adjusts the conveying speed.

Description of drawings

Fig. 1 is the hydraulic principle diagram of the present invention.

The meanings of reference signs are as follows: 1. The first overflow valve; 2. The first hydraulic control reversing valve; 3. The first flow regulating valve; 4. The first pressure compensation valve; 5. The first electromagnetic reversing valve; 6 , the first hydraulic motor; 7, the second hydraulic motor; 8, the second electromagnetic reversing valve; 9, the second pressure compensation valve; 10, the second flow regulating valve; 11, the second hydraulic control reversing valve; 12, Second relief valve.

Detailed ways

The design will be further described below in conjunction with the accompanying drawings of the description.

As shown in Figure 1, the system is mainly composed of two oil circuit systems. The second oil passage and the first oil passage are connected in exactly the same way except that the oil source is different. The inlets of the first relief valve 1 and the first hydraulic control reversing valve 2 in the first oil circuit system are all connected to the oil source P, and the outlets are connected to the oil tank T; the control port of the first pressure compensation valve 4 ① It is connected with the oil source P, the inlet ③ of the first pressure compensation valve 4 is connected with the outlet of the first flow regulating valve 3, the outlet ② of the first pressure compensation valve 4 is connected with the oil tank T, and the inlet of the first flow regulating valve 3 is connected with the oil tank T. The source P is connected; the inlet P1 of the first electromagnetic reversing valve 5 is connected to the oil source P, the outlets A1 and B1 of the first electromagnetic reversing valve 5 are connected to the first hydraulic motor 6, and the return of the first electromagnetic reversing valve 5 Port T1 is connected to tank T.

The two outlets of the second electromagnetic reversing valve 8 in the second oil circuit system are connected to the second hydraulic motor 7, and the inlets of the second overflow valve 12 and the second hydraulic control reversing valve 11 are all connected to the oil source P ' connection, the outlet is connected to the oil tank T; the control port of the second pressure compensation valve 9 is connected to the oil source P', the inlet of the second pressure compensation valve 9 is connected to the outlet of the second flow regulating valve 10, and the second pressure compensation valve The outlet of 9 is connected to the oil tank T, the inlet of the second flow regulating valve 10 is connected to the oil source P'; the inlet of the second electromagnetic reversing valve 8 is connected to the oil source P', the outlet of the second electromagnetic reversing valve 8 is connected to the first The two hydraulic motors 7 are connected, and the return port of the second electromagnetic reversing valve 8 is connected with the oil tank T.

further:

The hydraulic system for controlling material delivery of paver is characterized in that: the first flow regulating valve 3 and the second flow regulating valve 10 are electric proportional throttle valves.

The hydraulic system for controlling material delivery of paver is characterized in that: the first flow regulating valve 3 and the second flow regulating valve 10 are manually adjustable flow valves.

The hydraulic system for controlling material delivery of a paver is characterized in that: the first hydraulic control valve 2 and the second hydraulic control valve 11 are in the normal position and are one-way valves with an oil replenishment function. Valve, the reversing position is a throttle valve with throttling function.

The hydraulic system for controlling material delivery of paver is characterized in that: the reversing pressures of the first hydraulic control reversing valve 2 and the second hydraulic control reversing valve 11 are respectively lower than the first overflow The setting pressure of flow valve 1 and second relief valve 12.

The reversing pressure can be set to about 90% of the set pressure of the corresponding relief valve.

The hydraulic system for controlling the material delivery of paver is characterized in that: the first electromagnetic reversing valve 5 and the second electromagnetic reversing valve 8 are three-position four-way electromagnetic reversing valves with a central function of H type. to the valve.

Its working principle is: the first oil circuit system is driven by the oil source P to complete the corresponding function of the first hydraulic motor of the left conveying device; the second oil circuit system is completed by the oil source P' driving the second hydraulic motor of the right conveying device corresponding function. Since the working principles of the two oil circuit systems are exactly the same, the first oil circuit system is used as an example to illustrate: When the first electromagnetic reversing valve 5 is not energized and the valve is in the neutral position, the hydraulic system is unloaded, and the first hydraulic motor 6 No rotation, the system does not work; when the electromagnet Y1 of the first electromagnetic reversing valve 5 is energized so that the valve is in the left position, the hydraulic system builds up pressure, and the first hydraulic motor 6 rotates forward. When sucking air, the oil will be replenished through the check valve in the normal position of the hydraulic control reversing valve 2; when a material jam occurs during the operation of the feeding device, the hydraulic control reversing valve 2 will advance according to the rise of the system pressure. When the relief valve 1 is opened, the pressure overshoot is absorbed by the throttling device of the hydraulic control reversing valve 2. When the pressure continues to rise, the relief valve 1 is opened to unload the oil source to protect the system; When the electromagnet Y2 of the electromagnetic reversing valve 5 is energized so that the valve is in the right position, the hydraulic system builds up pressure, and the first hydraulic motor 6 reverses to remove the fault of the material jam; when it is necessary to adjust the feeding speed, it can be adjusted by The flow regulating valve 3 regulates the flow of the system. Due to the function of the pressure compensation valve, the flow of the system can be adjusted accurately.

Through the realization of the above technical solutions, the oil source can be controlled by the first and second electromagnetic reversing valves to drive the hydraulic motor to achieve forward and reverse rotation; The valve will open ahead of the first and second relief valves according to the rise of the system pressure, and the pressure overshoot will be absorbed by the throttling devices of the first and second hydraulic control reversing valves. When the pressure continues to rise, the first and second relief valves will The second overflow valve is opened to unload the oil source to protect the system; if it is necessary to adjust the delivery speed, an electric proportional throttle valve or a manual throttle valve can be selected to adjust the system according to performance and cost considerations. The flow is adjusted.

It has been verified by practice that the feeding hydraulic system in the present invention can not only realize the forward and reverse function of the feeding device; but also can effectively absorb the system pressure shock caused by the feeding jam; and according to the system requirements, it can pass the flow rate Manual adjustment or electric proportional adjustment can effectively adjust the conveying speed; the system is easy to operate and has various functions, especially suitable for the paver conveying hydraulic system in various paving conditions.

The rationale, main features and advantages of the design are shown and described above. Those skilled in the industry should understand that this design is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principles of this design. On the premise of not departing from the spirit and scope of this design, this design will also have Various changes and improvements all fall within the scope of the claimed design. The scope of protection required by the design is defined by the appended claims and their equivalents.

Claims (6)

1. control a hydraulic system for spreading machine material conveying, it is characterized in that: be made up of the first oil-way system and the second oil-way system, described first oil-way system and the second oil-way system are connected to fuel tank T by same drainback passage;

Described first oil-way system is made up of oil sources P, fuel tank T, the first relief valve, the first pilot operated directional control valve, first flow modulating valve, the first pressure-compensated valve, the first solenoid directional control valve, the first oil hydraulic motor;

Described second oil-way system by oil sources P', fuel tank T, the second relief valve, the second pilot operated directional control valve, second adjustable valve, the second pressure-compensated valve, the second solenoid directional control valve and, the second oil hydraulic motor forms;

Described first oil-way system, oil sources P is connected with the import of the first solenoid directional control valve, two outlets of the first solenoid directional control valve are connected with the first oil hydraulic motor, the outlet of the first solenoid directional control valve is connected with fuel tank T, first relief valve, the first pilot operated directional control valve are connected in the entrance and exit two ends of the first solenoid directional control valve in parallel, and the first pressure-compensated valve is connected in parallel on the entrance and exit two ends of the first solenoid directional control valve after connecting with first flow modulating valve;

Described second oil-way system, oil sources P' is connected with the import of the second solenoid directional control valve, two outlets of the second solenoid directional control valve are connected with the second oil hydraulic motor, the outlet of the second solenoid directional control valve is connected with fuel tank T, second relief valve, the second pilot operated directional control valve are connected in the entrance and exit two ends of the second solenoid directional control valve in parallel, and the second pressure-compensated valve is connected in parallel on the entrance and exit two ends of the second solenoid directional control valve after connecting with second adjustable valve.

2. a kind of hydraulic system controlling spreading machine material conveying as claimed in claim 1, is characterized in that: described first flow modulating valve, second adjustable valve are electric proportional throttle valve.

3. a kind of hydraulic system controlling spreading machine material conveying as claimed in claim 1, is characterized in that: described first flow modulating valve, second adjustable valve are manual adjustable throttle valve.

4. a kind of hydraulic system controlling spreading machine material conveying as claimed in claim 1, it is characterized in that: described first pilot operated directional control valve, the second pilot operated directional control valve one-way valve that to be its normal orientation be with repairing function, commutation position is the throttle valve with throttling function.

5. a kind of hydraulic system controlling spreading machine material conveying as claimed in claim 1, is characterized in that: the commutation pressure of described first pilot operated directional control valve, the second pilot operated directional control valve is respectively lower than the setting pressure of described first relief valve, the second relief valve.

6. a kind of hydraulic system controlling spreading machine material conveying as claimed in claim 1, is characterized in that: the three-position four-way electromagnetic directional valve of described first solenoid directional control valve, the second solenoid directional control valve to be Median Function be H type.