CN201187300Y

CN201187300Y - Semi-closed type hydraulic system applied to development machine

Info

Publication number: CN201187300Y
Application number: CNU2007200158735U
Authority: CN
Inventors: 陈锷; 徐宗桥; 牟东; 赵楠; 王冶
Original assignee: Sany Heavy Equipment Co Ltd
Current assignee: Sany Heavy Equipment Co Ltd; Sany Heavy Industry Co Ltd
Priority date: 2007-11-14
Filing date: 2007-11-14
Publication date: 2009-01-28
Anticipated expiration: 2017-11-14

Abstract

The utility model relates to a structure of a hydraulic system for a cantilever-type tunnel boring machine, particularly to a semi-closed hydraulic system used for a tunnel boring machine. The hydraulic system comprises a host system and an auxiliary system. The host system comprises a main oil pump, a control element, an executing mechanism and a filter, wherein the main oil pump, the control element, the executing mechanism and the filter are arranged in sequence on a pipeline and the filter is connected with the oil-sucking port of the main oil pump, thereby forming a closed circulation host system. The auxiliary system comprises a gear pump and a filter, a gear pump is connected with the filter via a pipeline and the exit of the filter is connected on the oil return pipeline of the host system, thereby forming an opened auxiliary system. The auxiliary system serves to supplement a high-cleanness hydraulic oil to the host system. The semi-closed hydraulic system used on the tunnel boring machine not only allows the tunnel boring machine to automatically distribute the power according to the load during the operation, but also reduces pollution probability of the working medium during the operation of the system, and reduces fault due to the pollution to the system.

Description

Be applied to the half-closed hydraulic system in the development machine

Technical field

The utility model relates to the form of boom-type roadheader hydraulic system, is specially a kind of half-closed hydraulic system that is applied in the development machine.

Background technology

At present, mostly the boom-type roadheader hydraulic system is to adopt open system, is characterized in that the loop is simple, thermal diffusivity is good, but the following deficiency that is difficult to overcome is arranged: system's vulnerable to pollution, and the fuel tank volume is excessive, many pump discharges are distributed and are difficult to complementation, cause single pump power deficiency, all the other pump power excess phenomenons.

The utility model content

The purpose of this utility model is to provide a kind of half-closed hydraulic system that is applied in the development machine, and excessive, the many pump discharge of vulnerable to pollution, fuel tank volume that solves traditional open system existence is distributed problems such as being difficult to complementation.

The technical solution of the utility model is:

A kind of half-closed hydraulic system that is applied in the development machine, this hydraulic system is provided with main system and accessory system, main system comprises main oil pump, control element, executing agency, strainer II, main oil pump, control element, executing agency, strainer II set gradually on pipeline, strainer II links the inlet port of main oil pump, forms the closed cycle main system; Accessory system comprises gear pump, strainer I, and gear pump links to each other by pipeline with strainer I, and strainer I outlet is connected to on the main system return line, forms the open type accessory system.

Described half-closed hydraulic system, the fuel tank of hydraulic system connects the oil suction strainer by pipeline, and the oil suction filter outlet divides two-way, and one the tunnel is connected to main oil pump through one way valve, and another road is connected to gear pump.

Described half-closed hydraulic system is equipped with the prepressing type air filter on the fuel tank.

Described half-closed hydraulic system, main oil pump pump the end and the suction side be separately installed with principal pressure table and secondary stress table.

Described half-closed hydraulic system is connected with the pipeline that is communicated with fuel tank on the return line of main system, the pipeline that should be communicated with fuel tank is provided with cooler, counterbalance valve.

Described half-closed hydraulic system is provided with high pressure filter on the pipeline that is communicated with between main oil pump and the control element.

The beneficial effects of the utility model are:

1, the half-closed hydraulic system of the utility model, contaminated probability is little, and system is contaminated and the fault rate that causes reduces.

2, the half-closed hydraulic system of the utility model, fuel tank is little, makes equipment compacter, saves the cost when changing working media.

3, the half-closed hydraulic system of the utility model is distributed power automatically according to load when making development machine work.

4, the half-closed system of the utility model has a clear superiority on little type.

5, the half-closed hydraulic system applications of the utility model is on boom-type roadheader, distributes power automatically according to load in the time of not only can making development machine work, and when making system works, the contaminated probability of working media reduces, and system reduces because of polluting the fault that produces; The application of half-closed system on development machine can reduce the volume of fuel tank, makes facility compact, and the working media of changing will be less than open system, can save cost for the user indirectly.

Description of drawings

Fig. 1 is the utility model hydraulic principle structure chart.

Among the figure, 1, motor; 2, main oil pump; 3, gear pump; 4, safety valve; 5, strainer I; 6, strainer II; 7, cooler; 8, counterbalance valve; 9, oil suction strainer; 10, one way valve; 11, prepressing type air filter; 12, fuel tank; 13, secondary stress table; 14, high pressure filter; 15, principal pressure table; 16, control element; 17, executing agency.

The specific embodiment

As shown in Figure 1, the utility model is applied to the half-closed hydraulic system in the development machine, this hydraulic system is provided with main system and accessory system, main system comprises main oil pump 2, control element 16, executing agency 17, strainer II6, main oil pump 2, control element 16, executing agency 17, strainer II6 sets gradually on pipeline, strainer II6 links the inlet port of main oil pump 2, realize the hydraulic-driven function of development machine, working media circulates between the loop of compositions such as main oil pump 2 and executing agency 17, form the closed cycle main system, the flow of main oil pump 2 is to be automatically assigned to executing agency 17 by system according to work requirements; Accessory system comprises gear pump 3, strainer I5, and gear pump 3 links to each other by pipeline with strainer I5, and strainer I5 outlet is connected to on the main system return line, forms the open type accessory system.Accessory system provides working media (as: high clean hydraulic pressure wet goods) through filtering, major-minor two systems for main system: open type of an enclosed, be collectively referred to as half-open half-closedly, and be called for short half-closed.The fuel tank 12 of hydraulic system connects oil suction strainer 9 by pipeline, and 9 outlets of oil suction strainer divide two-way, and one the tunnel is connected to main oil pump 2 through one way valve 10, and another road is connected to gear pump 3; Prepressing type air filter 11 is installed on the fuel tank 12, main oil pump 2 pump the end and the suction side be separately installed with principal pressure table 15 and secondary stress table 13.Be provided with cooler 7, counterbalance valve 8 successively on the return line of main system and the pipeline that fuel tank 12 is communicated with, on the pipeline that is communicated with between main oil pump 2 and the control element 16, can be provided with high pressure filter 14; In addition, can also be provided with the safety valve 4 that is communicated with fuel tank 12 on the accessory system.System of the present utility model starts the moment main system and draws working medias from fuel tank 12 through oil suction strainers 9 and one way valve 10, when accessory system after main system provides working media, this one way valve 10 is closed.

In the utility model, main oil pump 2 (promptly driving oil pump) can adopt the variable hydraulic planger pump with load-sensitive and constant output characteristic of a big discharge capacity; Gear pump 3 (being slippage pump) adopts constant displacement pump; Control element is the hydraulic control multiple directional control valve with load-sensitive characteristic; Executing agency is motor and oil cylinder.

The utility model hydraulic principle is as follows:

Motor 1 starts and drive main oil pump 2 and gear pump 3 work, main oil pump 2 starts moment from fuel tank 12 process oil suction strainers 9 and one way valve 10 absorption hydraulic oil, prepressing type air filter 11 makes fuel tank have a point pressure, the minimizing system is subjected to outside contamination, the oil that pumps from main oil pump 2 enters executing agency 17 through control element 16, return main oil pump 2 inlet ports through filter II6, form closed circuit.Because element internal always has part to leak, therefore recirculating oil quantity will lack, gear pump 3 from fuel tank 12 through 9 oil suctions of oil suction strainer, the oil process filter I5 that pumps is to the main system fuel feeding, because gear pump 3 flows will be much larger than the main system leakage rate, some oil is got back to fuel tank 12 through cooler 7 and counterbalance valve 8 in the main system oil return.One way valve uses as counterbalance valve 8, makes main system oil return and accessory system fuel feeding can fully supply with main oil pump 2, and unnecessary oil is through these counterbalance valve 8 oil sump tanks 12, and high pressure filter 14 makes main oil pump Ls avoid polluting.The function of accessory system is: for system provides clean hydraulic oil.4 pairs of systems of safety valve play overload protection function, and principal pressure table 15 and secondary stress table 13 are monitored the oil pressure that main oil pump 2 pumps and the pressure of main oil pump 2 suction sides respectively.

Claims

1, a kind of half-closed hydraulic system that is applied in the development machine, it is characterized in that: this hydraulic system is provided with main system and accessory system, main system comprises main oil pump (2), control element (16), executing agency (17), strainer II (6), main oil pump (2), control element (16), executing agency (17), strainer II (6) set gradually on pipeline, strainer II (6) links the inlet port of main oil pump (2), forms the closed cycle main system; Accessory system comprises gear pump (3), strainer I (5), and gear pump (3) links to each other by pipeline with strainer I (5), and strainer I (5) outlet is connected to on the main system return line, forms the open type accessory system; The fuel tank of hydraulic system (12) connects oil suction strainer (9) by pipeline, and oil suction strainer (9) outlet divides a two-way, and one the tunnel is connected to main oil pump (2) through one way valve (10), and another road is connected to gear pump (3).

2, according to the described half-closed hydraulic system of claim 1, it is characterized in that: prepressing type air filter (11) is installed on the fuel tank (12).

3, according to the described half-closed hydraulic system of claim 1, it is characterized in that: main oil pump (2) pump the end and the suction side be separately installed with principal pressure table (15) and secondary stress table (13).

4, according to the described half-closed hydraulic system of claim 1, it is characterized in that: be connected with the pipeline that is communicated with fuel tank on the return line of main system, the pipeline that should be communicated with fuel tank is provided with cooler (7), counterbalance valve (8).

5, according to the described half-closed hydraulic system of claim 1, it is characterized in that: on the pipeline that is communicated with between main oil pump (2) and the control element (16), be provided with high pressure filter (14).