CN219006928U

CN219006928U - Quick release oil circuit of injection molding machine variable pump

Info

Publication number: CN219006928U
Application number: CN202223356250.8U
Authority: CN
Inventors: 饶健强; 甘伟嗣; 黄志洋
Original assignee: Guangdong Youzhu Precision Machinery Co ltd
Current assignee: Guangdong Youzhu Precision Machinery Co ltd
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-05-12
Anticipated expiration: 2032-12-14

Abstract

The utility model relates to a quick pressure relief oil way of a variable pump of an injection molding machine, and belongs to the technical field of injection molding machines. The hydraulic oil pressure relief device comprises a variable pump, a pressure relief valve bank and an output end, wherein an oil inlet of the variable pump is communicated with an oil tank, an oil outlet of an oil drain pipe of the variable pump is communicated with an oil inlet of the pressure relief valve bank, and an oil outlet of the pressure relief valve bank is communicated with the oil tank and the output end.

Description

Quick release oil circuit of injection molding machine variable pump

Technical Field

The utility model belongs to the technical field of injection molding machines, and particularly relates to a quick pressure relief oil way of a variable pump of an injection molding machine.

Background

In the mechanical industry of injection molding machines, the hydraulic pump used by the existing injection molding machine generally adopts a constant hydraulic pump, but the whole working process of the injection molding machine is staged, the required hydraulic pressure in each stage is different, but the pressure of the whole injection molding link is the same due to the constant oil supply quantity of the oil source hydraulic pump, so that the existing injection molding machine is additionally provided with an overflow valve, and when the pressure is higher than the required pressure, the energy can be released through the overflow valve, so that the hydraulic pump can realize the pressure requirement of all links only by meeting the highest pressure.

In recent years, various injection molding machine factories strive for research and development of new injection molding machine products with energy-saving effect, particularly, in many factories in urban areas in China, a variable pump is arranged in a scale to achieve the injection molding machine with energy-saving effect, and the variable pump injection molding machine achieves the purpose of saving electricity by changing the discharge capacity of a hydraulic pump and simultaneously changing the load of a motor along with the discharge capacity under the condition that the rotating speed is unchanged. The main difference between the variable pump and the standard constant displacement pump is that the output power is different, the output power of the variable pump is changed along with the change of the load, the output power of the constant displacement pump is relatively constant, the output power of the variable pump is very low under the condition of small flow action, and the output power of the constant displacement pump is basically constant, but the pressure relief of the variable pump is slow when the pressure relief is carried out on the existing variable pump injection molding machine, so that the output end of the injection molding machine is subjected to larger oil pressure impact when the action is switched, and the service life of the injection molding machine is greatly influenced for a long time.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides a quick pressure relief oil way of a variable pump of an injection molding machine, and solves the problems that the variable pump is slowly relieved when the variable pump injection molding machine is relieved, so that the injection molding machine is subjected to larger oil pressure impact when the action is switched, and the practical service life of the injection molding machine is greatly influenced in the long term.

The aim of the utility model can be achieved by the following technical scheme: the utility model provides a quick release oil circuit of injection molding machine variable pump, includes variable pump, pressure buffer valves and output, the oil inlet and the oil tank intercommunication of variable pump, the oil drain pipe hydraulic fluid port and the oil inlet intercommunication of pressure buffer valves of variable pump, the oil-out and the oil tank and the output intercommunication of pressure buffer valves.

According to the quick pressure relief oil way of the variable pump of the injection molding machine, the impact force generated by the variable pump during pressure relief is buffered through the pressure buffer valve group by arranging the pressure buffer valve group at the oil outlet of the oil drain pipe of the variable pump, so that the oil pressure impact of the injection molding machine during action switching is reduced, and the service life of the injection molding machine can be prolonged.

As a preferable technical scheme of the utility model, the pressure buffer valve group comprises a pilot overflow valve, a pressure reducing valve, an electromagnetic reversing valve and a one-way valve, wherein an oil inlet of the pilot overflow valve is communicated with an oil drain pipe oil port of the variable pump, a control oil port of the pilot overflow valve is connected with an oil inlet of the pressure reducing valve, an oil drain port of the pressure reducing valve is connected with an oil inlet of the electromagnetic reversing valve, and an oil drain port of the electromagnetic reversing valve is communicated with an oil tank and an output end through the one-way valve.

As a preferable technical scheme of the utility model, a fixed throttle is further arranged between the pressure reducing valve and the electromagnetic directional valve, and an oil drain port of the pressure reducing valve is connected with an oil inlet of the electromagnetic directional valve through the fixed throttle.

As a preferable technical scheme of the utility model, the oil discharge port of the electromagnetic directional valve is also communicated with the one-way valve and is provided with an adjustable choke in parallel, and the oil discharge port of the electromagnetic directional valve is communicated with the oil tank and the output end through the adjustable choke and the one-way valve which are connected in parallel.

As a preferable technical scheme of the utility model, a filter is further arranged between the oil inlet of the variable pump and the oil tank, and the oil inlet of the variable pump is communicated with the oil tank through the filter.

As a preferable technical scheme of the utility model, the pilot overflow valve further comprises an oil return port, the pressure reducing valve further comprises an oil drain port, the electromagnetic directional valve further comprises an oil return port, and the oil return ports or the oil drain ports of the pilot overflow valve, the pressure reducing valve and the electromagnetic directional valve are communicated with the oil tank.

The beneficial effects of the utility model are as follows: through set up pressure buffer valves in the oil drain pipe hydraulic fluid port department of variable pump, pressure relief is carried out to guide's overflow valve, relief pressure valve and the electromagnetic directional valve in the pressure buffer valves that produce when the variable pump release, can filter the oil that gets into the variable pump through the filter simultaneously, reduces impurity in the hydraulic oil and blocks up the oil circuit and lead to the condition that the oil circuit receives the damage.

Drawings

The present utility model is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.

FIG. 1 is a schematic diagram of a system of a pressure relief oil circuit of the present utility model;

description of the main reference signs

In the figure: 1. a variable displacement pump; 2. a pressure buffer valve group; 21. a pilot-operated overflow valve; 22. a pressure reducing valve; 23. an electromagnetic reversing valve; 24. a one-way valve; 25. fixing the throttle orifice; 26. an adjustable orifice; 3. an output end; 4. an oil tank; 5. and (3) a filter.

Detailed Description

In order to further describe the technical means and effects adopted by the present utility model for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present utility model with reference to the accompanying drawings and preferred embodiments.

Referring to fig. 1, this embodiment provides a quick release oil circuit of variable pump of injection molding machine, including variable pump 1, pressure buffer valves 2 and output 3, the oil inlet and the oil tank 4 intercommunication of variable pump 1, the oil drain pipe hydraulic fluid port communicates with the oil inlet of pressure buffer valves 2, the oil-out and the oil tank 4 and the output 3 intercommunication of pressure buffer valves 2, through setting up pressure buffer valves 2 in the oil drain pipe hydraulic fluid port department of variable pump 1, let the oil pressure of variable pump 1 enter into output 3 through pressure buffer valves 2 partly, partly flow back into oil tank 4, let the oil pressure that variable pump 1 produced can slow down the oil pressure through pressure buffer valves 2, let the injection molding machine receive the oil pressure impact reduction when the action switches, the life of extension injection molding machine.

In order to better slow down the oil pressure, in an embodiment, the pressure buffer valve group 2 includes a pilot relief valve 21, a pressure reducing valve 22, an electromagnetic directional valve 23 and a check valve 24, the oil pressure is discharged from an oil drain port of the variable pump 1, the oil pressure enters from an oil inlet of the pilot relief valve 21, and when the oil inlet pressure is increased to the condition that a pilot valve of the pilot relief valve 21 is opened, the liquid flow flows back to the oil tank 4 through a damping hole on a main valve core and the pilot valve. Because of the damping action of the damping hole, the hydraulic pressure in the upper and lower directions received by the main valve core is unequal, the main valve core moves upwards under the action of the pressure difference to open the valve port to realize overflow and maintain the pressure basically stable, the oil pressure discharged from the oil discharge pipe oil port of the variable pump 1 is stabilized through the pilot overflow valve 21, the oil discharged from the oil control port of the pilot overflow valve 21 enters the pressure reducing valve 22 from the oil inlet, the oil pressure of the pressure reducing valve 22 is further reduced, the oil discharged from the pressure reducing valve 22 enters the electromagnetic directional valve 23, after the electromagnetic valve is connected, the oil can flow into the one-way valve 24 from the electromagnetic directional valve 23, part of the oil enters the output end 3 from the one-way valve 24, part of the oil returns to the oil tank 4, the oil pressure generated by the variable pump 1 is reduced through the pilot overflow valve 21 and the pressure reducing valve 22, and the oil pressure impact of the injection molding machine is reduced when the operation is switched.

In order to reduce damage to the relief valve 22 caused by too large oil pressure, in one embodiment, a fixed orifice 25 is further provided between the relief valve 22 and the electromagnetic directional valve 23, because the oil pressure that the relief valve 22 can withstand is within a certain threshold value, in order to prevent the oil pressure that the relief valve 21 can withstand from exceeding the oil pressure that the relief valve 22 can withstand, and a fixed orifice 25 is further provided between the relief valve 22 and the electromagnetic directional valve 23, so that the oil pressure that the relief valve 21 can withstand from the pilot relief valve 21 is limited to the maximum value through the fixed orifice 25, and the oil pressure that the relief valve 22 can withstand from exceeding the range that the relief valve 22 can withstand.

In order to enable the pressure received by the output end 3 to be within a preset range, in one embodiment, the oil discharge port of the electromagnetic directional valve 23 is also communicated with the one-way valve 24 in parallel and provided with an adjustable choke 26, so that if the oil pressure coming out of the electromagnetic directional valve 23 is not within the range of the pressure received by the output end 3, the oil pressure can be further limited through the adjustable choke 26, and the oil pressure coming out of the electromagnetic directional valve 23 is ensured to be within the range of the pressure received by the output end 3.

In order to prevent the oil in the pressure relief oil path from blocking the oil path due to impurities, in an embodiment, a filter 5 is further disposed between the oil inlet of the variable pump 1 and the oil tank 4, so that the oil entering the variable pump 1 from the oil tank 4 can be filtered by the filter 5, and the oil in the pressure relief oil path can not block the oil path due to impurities.

In order to prevent the pilot relief valve 21, the pressure reducing valve 22 and the electromagnetic directional valve 23 from being blocked by the oil in the oil chamber, in one embodiment, the oil return ports or the oil drain ports of the pilot relief valve 21, the pressure reducing valve 22 and the electromagnetic directional valve 23 are all communicated with the oil tank 4, and the other ends of the oil inlets of the pilot relief valve 21, the pressure reducing valve 22 and the electromagnetic directional valve 23 are communicated with the oil tank 4 during operation, so that the influence of the back pressure generated by the oil pressure in a chamber on the operation of the pilot relief valve 21, the pressure reducing valve 22 and the electromagnetic directional valve 23 can be avoided.

The present utility model is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present utility model.

Claims

1. The utility model provides a quick release oil circuit of injection molding machine variable pump which characterized in that: the variable displacement pump comprises a variable displacement pump (1), a pressure buffer valve group (2) and an output end (3), wherein an oil inlet of the variable displacement pump (1) is communicated with an oil tank (4), an oil outlet of an oil drain pipe of the variable displacement pump (1) is communicated with an oil inlet of the pressure buffer valve group (2), and an oil outlet of the pressure buffer valve group (2) is communicated with the oil tank (4) and the output end (3).

2. The quick pressure relief oil circuit of a variable pump of an injection molding machine according to claim 1, wherein: the pressure buffer valve group (2) comprises a pilot overflow valve (21), a pressure reducing valve (22), an electromagnetic reversing valve (23) and a one-way valve (24), wherein an oil inlet of the pilot overflow valve (21) is communicated with an oil drain pipe oil port of the variable pump (1), a control oil port of the pilot overflow valve (21) is connected with an oil inlet of the pressure reducing valve (22), an oil drain port of the pressure reducing valve (22) is connected with an oil inlet of the electromagnetic reversing valve (23), and an oil drain port of the electromagnetic reversing valve (23) is communicated with an oil tank (4) and an output end (3) through the one-way valve (24).

3. The quick pressure relief oil circuit of a variable pump of an injection molding machine according to claim 2, wherein: a fixed throttle (25) is further arranged between the pressure reducing valve (22) and the electromagnetic directional valve (23), and an oil drain port of the pressure reducing valve (22) is connected with an oil inlet of the electromagnetic directional valve (23) through the fixed throttle (25).

4. The quick pressure relief oil circuit of a variable pump of an injection molding machine according to claim 2, wherein: the oil discharge port of the electromagnetic directional valve (23) is also communicated with the one-way valve (24) in parallel and is provided with an adjustable throttle (26), and the oil discharge port of the electromagnetic directional valve (23) is communicated with the oil tank (4) and the output end (3) through the adjustable throttle (26) and the one-way valve (24) which are connected in parallel.

5. The quick pressure relief oil circuit of a variable pump of an injection molding machine according to claim 1, wherein: a filter (5) is further arranged between the oil inlet of the variable pump (1) and the oil tank (4), and the oil inlet of the variable pump (1) is communicated with the oil tank (4) through the filter (5).

6. The quick pressure relief oil circuit of a variable pump of an injection molding machine according to claim 2, wherein: the pilot overflow valve (21) further comprises an oil return port, the pressure reducing valve (22) further comprises an oil drain port, the electromagnetic directional valve (23) further comprises an oil return port, and the oil return ports or the oil drain ports of the pilot overflow valve (21), the pressure reducing valve (22) and the electromagnetic directional valve (23) are communicated with the oil tank (4).