CN211901133U

CN211901133U - Closed hydraulic system for scraper conveyor

Info

Publication number: CN211901133U
Application number: CN202020213649.2U
Authority: CN
Inventors: 尹正文; 王磊
Original assignee: Shanghai Pohu Drive System Co ltd
Current assignee: Shanghai Pohu Drive System Co ltd
Priority date: 2020-02-26
Filing date: 2020-02-26
Publication date: 2020-11-10
Anticipated expiration: 2030-02-26

Abstract

The utility model discloses a closed hydraulic system for scraper conveyor, including power supply system, governing system, power supply system includes low-speed big torque motor and plunger pump, governing system includes control valve group, proportional valve, variable cylinder, oil supplementing pump and return circuit filter, the oil-out of oil supplementing pump is connected to the one-way valve group of oil supplementing; the control valve group comprises a one-way throttle valve and an electromagnetic proportional valve, the oil outlet end of the one-way throttle valve is connected with the port B of the electromagnetic proportional valve, the port P and the port T of the electromagnetic proportional valve are respectively connected to a variable oil cylinder, and the piston rod of the variable oil cylinder is connected with the control rod of the proportional valve arranged on the plunger pump. The utility model adopts the low-speed large-torque hydraulic motor as the driving device, has the advantages of small volume and weight and convenient installation, can adjust the speed by changing the current on the electromagnetic proportional valve, and does not need a frequency converter; the low-speed large-torque motor can work at the maximum torque for a long time, and the damage condition of parts due to overheating is avoided.

Description

Closed hydraulic system for scraper conveyor

Technical Field

The utility model relates to a scraper conveyor opens drive technical field, specifically is a closed hydraulic system for scraper conveyor.

Background

The scraper conveyor is commonly called as an electric scraper-trough conveyer or a scraper-trough conveyer, plays roles of bearing, transporting coal, guiding a coal mining machine, supporting a pushing hydraulic support and the like in a fully mechanized mining face, can adapt to a use environment with uneven floor due to the fact that a machine body of the scraper conveyor is short and firm and can be bent vertically and horizontally, so that the scraper conveyor is widely applied to the coal mining and tunneling face, a driving device of the scraper conveyor is used as a power system of the scraper conveyor, and the reasonability and the reliability of design are crucial. At present, the scraper conveyer usually adopts the forms of double-speed motor drive, single-speed motor and hydraulic coupler drive, variable frequency motor drive and the like, has various advantages and disadvantages in application, and is mainly embodied in the following aspects:

1. the motor, the hydraulic coupler and the speed reducer have large volume and weight, and are inconvenient to install and maintain;

2. the hydraulic coupler is easy to spray liquid under the overload condition, and needs to be stopped for liquid filling maintenance, so that the production efficiency is influenced;

3. the motor of the scraper conveyor is directly connected to the machine body, so that the scraper conveyor has large vibration and is easy to damage when working;

4. the load can not be accurately monitored, and the conditions that the trolley is pulled by a large horse to waste energy or the trolley cannot be dragged due to insufficient power and the like easily occur under the condition that the working condition is not clear.

The hydraulic drive has the advantages of large power-mass ratio, stable operation, large-range stepless speed regulation, convenient control and maintenance and the like, so the hydraulic drive is widely applied to various mechanical industries, and the application of the hydraulic drive to a scraper conveyor is still blank.

Disclosure of Invention

An object of the utility model is to provide a closed hydraulic system for scraper conveyor to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a closed hydraulic system for a scraper conveyor comprises a power source system and an adjusting system, wherein the power source system comprises a low-speed large-torque motor and a plunger pump, an oil inlet and an oil outlet of the plunger pump are respectively connected to a working oil port of the low-speed large-torque motor, and the low-speed large-torque motor is used for driving a scraper conveyor sprocket to run; the regulating system comprises a control valve bank, a proportional valve, a variable oil cylinder, an oil supplementing pump and a loop filter, wherein an oil outlet of the oil supplementing pump is connected to an oil supplementing one-way valve bank; the control valve group comprises a one-way throttle valve and an electromagnetic proportional valve, the oil outlet end of the one-way throttle valve is connected with the oil outlet of the electromagnetic proportional valve, the oil inlet of the electromagnetic proportional valve is respectively connected to a variable oil cylinder, and the piston rod of the variable oil cylinder is connected with the control rod of the proportional valve arranged on the plunger pump.

As a further aspect of the present invention: a loop control system is arranged between the plunger pump and the low-speed large-torque motor, the loop control system comprises an overflow valve and a flushing valve which are sequentially connected in parallel in a closed loop of the plunger pump and the low-speed large-torque motor, two oil inlets of the flushing valve are respectively connected in passages at two ends, and an oil outlet is connected with an oil inlet of the overflow valve.

As a further aspect of the present invention: the loop control system also comprises two groups of pressure filters which are respectively connected in series in the passages at two ends of the plunger pump and the low-speed large-torque motor.

As a further aspect of the present invention: and an oil return filter and a cooler are arranged in a connecting passage between the oil discharge port of the low-speed large-torque motor and the oil tank.

As a further aspect of the present invention: and the plunger pump and the closed loop of the low-speed large-torque motor are also connected in parallel with a safety valve, and an oil inlet and an oil outlet of the safety valve are respectively connected with the passages at two ends.

As a further aspect of the present invention: the oil-supplementing check valve group is connected in parallel in a closed loop of the plunger pump and the low-speed large-torque motor and consists of two check valves.

As a further aspect of the present invention: the plunger pump is a bidirectional variable pump, and the oil supplementing pump is a unidirectional constant delivery pump.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses fill the application blank of hydraulic system drive in scraper conveyor device, have following advantage:

1. the low-speed large-torque hydraulic motor is used as a driving device, and the hydraulic motor has the advantages of small volume and weight and convenience in installation;

2. no hydraulic coupler, no potential safety hazard such as hurting people by spraying liquid and the like;

3. the speed regulation is convenient, the speed regulation can be realized by changing the current on the electromagnetic proportional valve, and a frequency converter is not needed;

4. the hydraulic drive is in flexible connection, and the low-speed large-torque motor can work at the maximum torque for a long time, so that the damage condition of parts due to overheating is avoided.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only 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.

Referring to fig. 1, in an embodiment of the present invention, a closed hydraulic system for a scraper conveyor includes a power source system and an adjusting system, where the power source system includes a low-speed large torque motor 1 and a plunger pump 7, the plunger pump 7 is a bidirectional variable displacement pump, an oil inlet and an oil outlet of the plunger pump 7 are respectively connected to a working oil port of the low-speed large torque motor 1 to form a closed loop, and the low-speed large torque motor 1 is used to drive a scraper conveyor sprocket to operate; the regulating system comprises a control valve group 8, a proportional valve 9, a variable oil cylinder 10, an oil supplementing pump 11 and a loop filter 12, wherein the oil supplementing pump 11 is a one-way constant delivery pump, an oil outlet of the oil supplementing pump 11 is connected to an oil supplementing one-way valve group 6, the oil supplementing pump 11 absorbs oil and fills the oil into a closed system of a power source, and the oil supplementing one-way valve group 6 is connected in parallel in a closed loop of the plunger pump 7 and the low-speed large-torque motor 1 and consists of two one-way valves;

the control valve group 8 comprises a one-way throttle valve and an electromagnetic proportional valve, the oil outlet end of the one-way throttle valve is connected with the oil outlet of the electromagnetic proportional valve, the oil inlet end of the one-way throttle valve is connected to the oil supplementing loop, the oil inlet of the electromagnetic proportional valve is respectively connected to the variable oil cylinder 10, the piston rod of the variable oil cylinder 10 is connected with the control rod of the proportional valve 9 arranged on the plunger pump 7, the one-way throttle valve can limit the flow entering the variable oil cylinder 10 and plays a role in avoiding impact and keeping stability, the electromagnetic proportional valve has the function of changing the magnitude and direction of control pressure through input current to push the proportional valve on the plunger pump 7 to act, changing the pressure at two ends of the variable oil cylinder 10, controlling the displacement of the plunger pump 7, changing the output rotating speed of the.

And the oil return filter 12 and the cooler 13 are respectively connected to an oil discharge port of the low-speed large-torque motor 1 and an oil tank and are respectively used for filtering return oil of the motor and cooling the return oil.

A loop control system is arranged between the plunger pump 7 and the low-speed large-torque motor 1, the loop control system comprises pressure filters 2 which are respectively connected in series in passages at two ends of the plunger pump 7 and the low-speed large-torque motor 1, an overflow valve 3, a flushing valve 4 and a safety valve 5 which are sequentially connected in parallel in closed circuits of the plunger pump 7 and the low-speed large-torque motor 1, the pressure filters 2 are used for filtering pollutants in the closed circuits at two ends of the motor, the overflow valve 3 is used for limiting oil supplementing pressure, two inlets of the flushing valve 4 are respectively connected in the passages at two ends, an oil outlet is connected with an oil inlet of the overflow valve 3, hydraulic oil is discharged from a low-pressure end of two paths of oil through the flushing valve 4 to flush a motor shell, and the flushed oil is discharged from the other oil discharge port of the motor and is cooled through a cooler 13; the oil inlet and the oil outlet of the safety valve 5 are respectively connected in series in the passages at the two ends, the oil inlet and the oil outlet are used for protecting a system, and when the pressure exceeds the set pressure of the safety valve, oil is discharged from the safety valve 5 to limit the maximum pressure.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a closed hydraulic system for scraper conveyor, includes power source system, governing system, its characterized in that: the power source system comprises a low-speed large-torque motor (1) and a plunger pump (7), an oil inlet and an oil outlet of the plunger pump (7) are respectively connected to a working oil port of the low-speed large-torque motor (1), and the low-speed large-torque motor (1) is used for driving a scraper conveyor sprocket to run; the adjusting system comprises a control valve group (8), a proportional valve (9), a variable oil cylinder (10) and an oil supplementing pump (11), wherein an oil outlet of the oil supplementing pump (11) is connected to the oil supplementing check valve group (6); the control valve group (8) comprises a one-way throttle valve and an electromagnetic proportional valve, the oil outlet end of the one-way throttle valve is connected with the oil outlet of the electromagnetic proportional valve, the oil inlet of the electromagnetic proportional valve is respectively connected to a variable oil cylinder (10), and the piston rod of the variable oil cylinder (10) is connected with the control rod of a proportional valve (9) arranged on the plunger pump (7).

2. The closed hydraulic system for the scraper conveyor as claimed in claim 1, wherein: a loop control system is arranged between the plunger pump (7) and the low-speed large-torque motor (1), the loop control system comprises an overflow valve (3) and a flushing valve (4) which are sequentially connected in parallel in a closed loop of the plunger pump (7) and the low-speed large-torque motor (1), two oil inlets of the flushing valve (4) are respectively connected in two-end passages, and oil outlets are connected with oil inlets of the overflow valve (3).

3. The closed hydraulic system for the scraper conveyor as claimed in claim 2, wherein: the loop control system also comprises two groups of pressure filters (2) which are respectively connected in series in the passages at two ends of the plunger pump (7) and the low-speed large-torque motor (1).

4. The closed hydraulic system for the scraper conveyor as claimed in claim 3, wherein: an oil return filter (12) and a cooler (13) are arranged in a connecting passage of an oil discharge port and an oil tank of the low-speed large-torque motor (1).

5. The closed hydraulic system for the scraper conveyor as claimed in claim 4, wherein: and the plunger pump (7) and the low-speed large-torque motor (1) are also connected with a safety valve (5) in a closed loop in parallel, and an oil inlet and an oil outlet of the safety valve (5) are respectively connected with the passages at two ends.

6. The closed hydraulic system for the scraper conveyor as claimed in claim 1, wherein: the oil supplementing check valve group (6) is connected in parallel in a closed loop of the plunger pump (7) and the low-speed large-torque motor (1) and consists of two check valves.

7. The closed hydraulic system for the scraper conveyor as claimed in claim 1, wherein: the plunger pump (7) is a bidirectional variable pump, and the oil supplementing pump (11) is a unidirectional fixed displacement pump.