CN209743148U

CN209743148U - Protection structure of internal gear pump during unloading of hydraulic servo control system

Info

Publication number: CN209743148U
Application number: CN201920036953.1U
Authority: CN
Inventors: 黄延安; 林杰
Original assignee: Guangzhou Anshuo Technology Co Ltd
Current assignee: Guangzhou Anshuo Technology Co Ltd
Priority date: 2019-01-09
Filing date: 2019-01-09
Publication date: 2019-12-06
Anticipated expiration: 2029-01-09

Abstract

the utility model discloses a protection structure of a hydraulic servo control system for an internal gear pump during unloading, which comprises an internal gear pump, an oil tank, a one-way check valve, a servo motor, an electromagnetic directional valve, a control valve and an oil cylinder, wherein the oil inlet end of the internal gear pump is connected with the oil tank, the oil outlet end of the other end of the internal gear pump is connected with the oil inlet end of the one-way check valve, the shaft end of the internal gear pump is connected with the servo motor, the oil outlet end of the one-way check valve is respectively connected with the electromagnetic directional valve and one end of the control valve, the oil circuit at one end of the control valve is connected with one end of the oil cylinder, the other end of the oil cylinder is connected with the other end of the control valve, and the oil circuit at the end of the control valve is connected with the electromagnetic directional, the purpose of protecting the internal gear pump is achieved.

Description

Protection structure of internal gear pump during unloading of hydraulic servo control system

Technical Field

The utility model relates to a hydraulic system technical field specifically is a protection architecture of internal gearing gear pump when hydraulic servo control system uninstalls.

Background

The hydraulic servo control system is a high-performance servo power driving system, is widely applied to equipment such as oil presses, injection molding machines, die casting machines, ceramic machines and the like, is suitable for various industries of national economy, has wide application in agriculture, chemical engineering, light spinning, traffic transportation and mechanical manufacturing, is particularly more prominent in high, new and top equipment, particularly meets the requirements of customers on electricity saving and water saving to the greatest extent while improving the precision and the efficiency, and adopts closed-loop control on a power driving system, pressure and flow without an overflow valve to assist unloading. The forming repetition precision of the hydraulic servo control system is obviously improved, the response speed is higher, the starting time is improved by more than half compared with the traditional system, the whole control system is ultra-performance and environment-friendly, the running noise of the whole machine is low, and the whole machine is quieter when running at low speed. The hydraulic oil is output in proportion, so that the generation of redundant heat is avoided, and the effects of saving water and energy greatly can be realized even without cooling the hydraulic oil, so that the conventional hydraulic servo control system is widely applied.

The internal gear pump is most suitable for being applied to a hydraulic pump of a hydraulic servo control system in the aspects of pressure, service life, energy conservation, environmental protection, noise, pollution resistance and the like, and the comprehensive use performance of the internal gear pump is far beyond that of a plunger pump, a vane pump, a screw pump and an external gear pump.

Due to the requirements of product precision and process, when a hydraulic servo control system works, the system generates mold closing force to enable a mold to be closed, high-pressure hydraulic oil (about 17MPa of some high-pressure hydraulic oil) in an oil cylinder needs to be unloaded, a small amount of high-pressure hydraulic oil is discharged from the oil cylinder, and then all parts in an oil circuit system can be ensured not to generate vibration and abnormal sound. In the traditional servo oil circuit system, because no overflow valve is arranged in the system to assist unloading, backflushing high-pressure hydraulic oil during unloading enters from an oil outlet of the internal gear pump, flows through a pump body of the gear pump, flows out from an oil inlet and finally flows back to an oil tank, and the backflushing high-pressure hydraulic oil can drive the internal gear pump to reversely rotate. However, the hydraulic internal gear pump is a one-way gear pump, normally, hydraulic oil enters the pump body by sucking oil from a low-pressure cavity of an oil inlet of the pump body, and after the pump body is separated by a crescent plate, the oil is discharged from an oil outlet of a high-pressure cavity, so that the hydraulic internal gear pump can not be inverted absolutely in terms of the working principle, otherwise, reverse friction can be generated between a gear pair of the internal gear pump and the oil separation crescent plate, particularly, under the condition that the crescent plate is not fixed, the crescent plate is easy to wear and even break, or the broken shaft or shaft head sealing element is easy to damage and the oil leaks, and the service life of the internal gear pump is shortened seriously.

Therefore, when the system is unloaded, high-pressure hydraulic oil enters from the oil outlet of the internal gear pump and returns to the oil tank after flowing out from the oil inlet, and the internal gear pump is an unreasonable oil path, and is inverted, so that the gear pump is easily damaged. The hydraulic circuit must be redesigned so that the high pressure hydraulic oil is not passed through the internal gerotor pump during unloading and is returned directly to the tank.

Therefore, an improved technique for solving the problem in the prior art is desired.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a protection architecture of internal gear pump when hydraulic servo control system uninstalls, the recoil unloads from the bypass towards the high-pressure oil of internal gear pump delivery port department when uninstalling the system, makes it directly get back to the oil tank, lets internal gear pump do not have the reversal completely, has stopped the harm of high-pressure oil to the gear pump inner structure to reach the purpose of protection internal gear pump, with the problem of proposing in solving above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a protection architecture of internal gear pump when hydraulic servo control system uninstalls, includes crescent gear pump, oil tank, one-way check valve, servo motor, solenoid directional valve, control valve and hydro-cylinder, crescent gear pump's oil feed end links to each other with the oil tank, the end of producing oil of the crescent gear pump other end links to each other with the one-way check valve oil feed end, crescent gear pump's axle head links to each other with servo motor, the one-way check valve oil feed end links to each other with solenoid directional valve and control valve one end respectively, control valve one end oil circuit links to each other with hydro-cylinder one end, the hydro-cylinder other end connection control valve other end, solenoid directional valve and oil tank are connected to.

Preferably, an oil inlet P of the electromagnetic directional valve is connected with an oil outlet end of a one-way check valve, a working port A of the electromagnetic directional valve is blocked, the oil inlet P of the electromagnetic directional valve is connected with the one-way check valve, a working port B is connected with an oil tank, the oil tank is further connected with an oil return port T, and closed paths of the oil inlet P, the working port A, the working port B and the oil return port T are controlled by the electromagnetic directional valve.

Preferably, an oil inlet and an oil outlet are respectively arranged at two ends of the internal gear pump, the oil inlet is connected with the oil tank, and the oil outlet is connected with the one-way check valve.

Preferably, the one-way check valve is a tubular one-way check valve and is selectable according to the displacement of the gear pump, namely 03, 04, 06 or 10.

Preferably, the electromagnetic directional valve is any one of a single-head two-position four-way electromagnetic directional valve or a double-head three-position four-way electromagnetic directional valve.

Compared with the prior art, the utility model discloses a show the effect and be:

A tubular one-way check valve is additionally arranged on an oil outlet pipeline of the internal gear pump, an electromagnetic reversing valve is additionally arranged on an oil circuit behind the internal gear pump, high-pressure hydraulic oil is enabled to directly return to an oil tank through an added bypass loop instead of flowing back through the oil outlet of the internal gear pump during unloading, the backflushing damage of the high-pressure hydraulic oil to the internal gear pump is avoided, the gear pump is completely free of reversal, the damage of the high-pressure oil to the internal structure of the internal gear pump is avoided, and the purpose of protecting the internal gear pump is achieved.

Drawings

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

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. It is obvious that the embodiments described are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other similar embodiments obtained by other persons skilled in the art without creative improvements belong to the limited protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: the utility model provides a protection architecture of internal gear pump when hydraulic servo control system uninstalls, including crescent gear pump 1, oil tank 2, one-way check valve 3, servo motor 4, solenoid directional valve 5, control valve 6 and hydro-cylinder 7, crescent gear pump 1 one end links to each other with oil tank 2, crescent gear pump 1 other end links to each other with one-way check valve 3, crescent gear pump 1 axle head links to each other with servo motor 4, 3 play oil ends of one-way check valve link to each other with solenoid directional valve 5 and 6 one end of control valve respectively, 6 one end oil circuits of control valve link to each other with 7 one ends of hydro-cylinder, the 6 other ends of 7 other ends connection control valves of hydro-cylinder, solenoid directional valve 5 and oil tank 2 are.

An oil inlet P51 of the electromagnetic directional valve 5 is connected with an oil outlet end of the one-way check valve 3, a working port A52 of the electromagnetic directional valve 5 is blocked, an oil inlet P51 of the electromagnetic directional valve 5 is connected with the one-way check valve 3, a working port B53 is connected with an oil pipe entering the oil tank 2, the oil tank 2 is also connected with an oil return port T54, and closed circuits of the oil inlet P51, the working port A52, the working port B53 and the oil return port T54 are controlled by the electromagnetic directional valve 5.

An oil inlet 11 and an oil outlet 12 are respectively arranged at two ends of the internal gear pump 1, the oil inlet 11 is connected with the oil tank 2, and the oil outlet 12 is connected with the one-way check valve 3.

When the servo motor rotates at a high speed (up to 2000 rpm at the high speed), the internal gear pump is driven to rotate, hydraulic oil enters from an oil tank through a gear pump oil inlet to generate high-pressure hydraulic oil, the high-pressure hydraulic oil is output from an outlet of the gear pump and passes through a one-way check valve behind an oil outlet, three holes are formed in an oil path block behind the oil outlet, a DSG-01-2B 2-D24-N1-50 type electromagnetic directional valve is installed and is respectively connected with an oil inlet P, a working port B and an oil return port T of the electromagnetic directional valve, the working port A is blocked and not connected, and an oil path of the oil inlet P to the working port A is blocked and does not participate. When the valve core is not electrified, the oil paths of the electromagnetic directional valve are communicated in parallel, only the working port B is communicated with the oil return port T, and the electromagnetic directional valve normally participates in the work of the system. The high-pressure hydraulic oil flows into the oil cylinder under the control of a control valve of the system to produce the action of mold closing. After the oil cylinder finishes the die closing action, the hydraulic oil cylinder of the system must be unloaded, the control valve is opened at the moment, a small part of high-pressure hydraulic oil must be backflushed and reflows from the oil cylinder, the one-way check valve does not allow oil to reversely pass through the one-way check valve, the control system provides signals at the same time, the DSG01-2B2-D24-N1-50 type electromagnetic directional valve is electrified, the oil passages of the electromagnetic directional valve are in cross communication, only the oil inlet P is communicated with the working port B, the unloaded high-pressure hydraulic oil can only enter from the oil inlet P, and flows out from the working port B after passing through the electromagnetic directional valve and is directly connected back to. When the parallel oil way of the electromagnetic directional valve is converted into the cross oil way, the instantaneous four-closing condition can occur (namely four interfaces of the electromagnetic directional valve are not communicated), but the pressure of the hydraulic oil way of the system is below 32MPa, so that the electromagnetic directional valve and the oil way system can not be influenced. The high-pressure hydraulic oil does not recoil back to the oil outlet of the internal gear pump and is directly introduced into the oil return box through the bypass, the high-pressure hydraulic oil which recoils during unloading has no influence on the gear pump, and the one-way check valve and the electromagnetic directional valve effectively protect the internal gear pump. The unloading has been accomplished to the process, and high pressure hydraulic oil is obstructed completely to the oil-out of toward the internal gearing gear pump, can not arouse the reversal of pump, can not harm the inner structure of gear pump, so this hydraulic circuit measure has reached the purpose of protecting internal gearing gear pump among the servo.

Through the improved installation of the oil circuit of the hydraulic servo control system, the potential hazard factors to the internal gear pump caused by the unloading of the system are completely eliminated.

The implementation example, the improvement measure is applied to a hydraulic servo control system of a 128T type injection molding machine, an AS5N-40F type internal gear pump is configured, a 06 type tubular one-way check valve and a DSG-01-2B 2-D24-N1-50 type electromagnetic reversing valve are selected, the whole machine is energy-saving, power-saving, environment-friendly, low in noise, stable and orderly in each action, and better in use effect, the service life of the internal gear pump is greatly prolonged, and most of the internal gear pumps are expected to be more than ten years.

Although the embodiments of the present invention have been shown and described, other changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, which is defined by the appended claims and their equivalents, which are within the scope of the invention.

Claims

1. The utility model provides a protection architecture of internal gear pump when hydraulic servo control system uninstalls which characterized in that: including crescent gear pump (1), oil tank (2), one-way check valve (3), servo motor (4), electromagnetic reversing valve (5), control valve (6) and hydro-cylinder (7), the oil feed end of crescent gear pump (1) links to each other with oil tank (2), the end of producing oil of crescent gear pump (1) other end links to each other with one-way check valve (3) oil feed end, the axle head and servo motor (4) of crescent gear pump (1) link to each other, one-way check valve (3) produce oil the end and link to each other with electromagnetic reversing valve (5) and control valve (6) one end respectively, control valve (6) one end oil circuit links to each other with hydro-cylinder (7) one end, hydro-cylinder (7) other end connection control valve (6) other end, control valve (6) this end oil circuit connection electromagnetic reversing valve (5) and oil tank (2).

2. The protection structure for the internal gear pump during unloading of the hydraulic servo control system according to claim 1, wherein: the oil outlet end of the one-way check valve (3) is connected to an oil inlet P (51) of the electromagnetic directional valve, a working port A (52) of the electromagnetic directional valve (5) is blocked, the oil inlet P (51) of the electromagnetic directional valve is connected with the one-way check valve (3), a working port B (53) is connected with the oil tank (2), the oil tank (2) is further connected with an oil return port T (54), and closed circuits of the oil inlet P (51), the working port A (52), the working port B (53) and the oil return port T (54) are controlled by the electromagnetic directional valve (5).

3. The protection structure for the internal gear pump during unloading of the hydraulic servo control system according to claim 1, wherein: an oil inlet (11) and an oil outlet (12) are respectively arranged at two ends of the internal gear pump (1), the oil inlet (11) is connected with the oil tank (2), and the oil outlet (12) is connected with the one-way check valve (3).

4. The protection structure for the internal gear pump during unloading of the hydraulic servo control system according to claim 1, wherein: the one-way check valve (3) is a tubular one-way check valve and can be selected from 03, 04, 06 or 10 types according to the displacement of the gear pump.

5. The protection structure for the internal gear pump during unloading of the hydraulic servo control system according to claim 1, wherein: the electromagnetic reversing valve (5) is any one of a single-head two-position four-way electromagnetic reversing valve or a double-head three-position four-way electromagnetic reversing valve.