CN217107625U

CN217107625U - Injection molding machine oil return backpressure governing system

Info

Publication number: CN217107625U
Application number: CN202220650012.9U
Authority: CN
Inventors: 姜洪; 马海舟; 杨华进; 韦明发
Original assignee: Zhejiang Shengbang Intelligent Equipment Co ltd; Zhejiang Sunbun Technology Co Ltd; Sunbun Group Co Ltd
Current assignee: Zhejiang Shengbang Intelligent Equipment Co ltd; Zhejiang Sunbun Technology Co Ltd; Sunbun Group Co Ltd
Priority date: 2022-03-24
Filing date: 2022-03-24
Publication date: 2022-08-02
Anticipated expiration: 2032-03-24

Abstract

An injection molding machine oil return backpressure regulating system. The problems of slow screw backspacing and low processing efficiency of the existing injection molding machine are solved. The oil-saving device comprises a main oil inlet, an oil tank, a screw rod, a driving oil cylinder and a rotary motor for driving the screw rod to rotate, wherein the driving oil cylinder comprises a cylinder body and a piston rod for driving the screw rod to linearly move, the piston rod divides the space in the cylinder body into a rodless cavity and a rod cavity, the oil-saving device further comprises a first reversing valve, a second reversing valve and an adjusting device, the main oil inlet is connected with the driving oil cylinder through the first reversing valve, the main oil inlet is connected with the rotary motor through the second reversing valve, and the oil outlet of the rotary motor is respectively connected with the rodless cavity of the driving oil cylinder and the adjusting device and adjusts pressure oil entering the rodless cavity through the adjusting device. The utility model discloses the machining efficiency of product has been improved greatly, simple structure moreover, and it is convenient to adjust, and the adaptation scope is wide.

Description

Injection molding machine oil return backpressure governing system

Technical Field

The utility model relates to an injection molding machine hydraulic control system, concretely relates to injection molding machine oil return backpressure governing system.

Background

An injection molding machine, also known as an injection molding machine or an injection molding machine, is a main molding device for manufacturing thermoplastic plastics or thermosetting plastics into plastic products of various shapes by using a plastic molding mold, and is divided into a vertical type, a horizontal type and a full-electric type. The injection molding machine can heat the plastic, apply high pressure to the molten plastic, and inject it to fill the mold cavity. In a common injection molding machine, when storing materials, a motor rotates to drive a screw to rotate and move backwards (a piston rod and the screw move backwards together), so that a rodless cavity cannot form a vacuum state, part of return oil flows back to an oil tank, part of return oil enters the rodless cavity, an adjustable back pressure does not exist in an oil return pipe, namely the piston rod and the screw can only slowly move backwards, and the processing efficiency is low; when in injection, the motor is not moved, and the driving oil cylinder drives the piston rod to move forwards together with the screw rod.

SUMMERY OF THE UTILITY MODEL

The problem of returning slowly for the screw rod of solving current injection molding machine among the background art, machining efficiency is low, the utility model provides an injection molding machine oil return backpressure governing system.

The technical scheme of the utility model is that: the utility model provides an injection molding machine oil return backpressure governing system, includes main oil inlet, oil tank, screw rod, driving cylinder, is used for the rotatory rotating motor of driving screw, driving cylinder include the cylinder body and be used for driving screw linear motion's piston rod, the piston rod with the space separation in the cylinder body for no pole chamber with have the pole chamber, still include first switching-over valve, second switching-over valve and adjusting device, main oil inlet link to each other with driving cylinder through first switching-over valve, main oil inlet passes through the second switching-over valve and links to each other with rotating motor, rotating motor's oil-out links to each other and adjusts the pressure oil that gets into no pole chamber through adjusting device with driving cylinder's no pole chamber and adjusting device respectively.

As a further improvement of the utility model, first switching-over valve have the second position that makes primary oil inlet and the first position, meso position that the drive cylinder rodless chamber is linked together and make primary oil inlet and drive cylinder have the third position that the pole chamber is linked together, the oil-out of rotary motor is linked together through first switching-over valve and drive cylinder rodless chamber when first switching-over valve is in the second position.

As a further improvement of the utility model, the adjusting device include the choke valve, the adjustable setting of opening size of choke valve.

As a further improvement of the present invention, the adjusting device includes a third direction valve, the third direction valve has a first position for opening and a second position for closing, the first position is connected with the oil tank, and the third direction valve is connected with the throttle valve in parallel.

As a further improvement of the utility model, the adjusting device comprises an electric proportional control valve.

As a further improvement of the utility model, the third reversing valve is a two-position two-way reversing valve.

As a further improvement of the utility model, the first reversing valve, the second reversing valve and the third reversing valve are electromagnetic reversing valves.

As a further improvement, the second reversing valve has a second position which makes the main oil inlet and the rotary motor be linked together at the first position and end.

As a further improvement, the first reversing valve is a three-position four-way reversing valve, and the second reversing valve is a two-position four-way reversing valve.

The beneficial effects of the utility model are that, adjusting device has been set up to the pressure oil that gets into the rodless chamber can be controlled through adjusting device's regulation, thereby makes the screw rod roll back fast, has improved the machining efficiency of product greatly, simple structure moreover, and it is convenient to adjust, and the adaptation scope is wide.

Drawings

Fig. 1 is a schematic view of a hydraulic principle of an embodiment of the present invention.

Fig. 2 is a schematic view of a hydraulic principle of the screw rod of the embodiment of the present invention when the screw rod moves backward passively.

Fig. 3 is a schematic view of a hydraulic principle of the embodiment of the present invention when the screw rod is actively moved backward.

Fig. 4 is a schematic diagram of a hydraulic principle of the embodiment of the present invention during injection.

In the figure, 1, a main oil inlet; 2. an oil tank; 3. a screw; 4. a driving oil cylinder; 41. a cylinder body; 42. a piston rod; 43. a rodless cavity; 44. a rod cavity; 5. a rotary motor; 6. a first direction changing valve; 7. a second directional control valve; 8. an adjustment device; 81. a throttle valve; 82. and a third reversing valve.

Detailed Description

The embodiments of the present invention will be further explained with reference to the accompanying drawings:

referring to fig. 1 and fig. 2-4, an injection molding machine return oil backpressure regulating system comprises a main oil inlet 1, an oil tank 2, a screw 3, a driving oil cylinder 4, a rotary motor 5 for driving the screw 3 to rotate, wherein the driving oil cylinder 4 comprises a cylinder body 41 and a piston rod 42 for driving the screw 3 to do linear motion, the piston rod 42 divides the space in the cylinder body 41 into a rodless cavity 43 and a rod cavity 44, the injection molding machine return oil backpressure regulating system further comprises a first reversing valve 6, a second reversing valve 7 and a regulating device 8, the main oil inlet 1 is connected with the driving oil cylinder 4 through the first reversing valve 6, the main oil inlet 1 is connected with the rotary motor 5 through the second reversing valve 7, and an oil outlet of the rotary motor 5 is respectively connected with the rodless cavity 43 and the regulating device 8 of the driving oil cylinder 4 and regulates pressure oil entering the rodless cavity 43 through the regulating device 8. The beneficial effects of the utility model are that, adjusting device has been set up to the pressure oil that gets into the rodless chamber can be controlled through adjusting device's regulation, thereby makes the screw rod roll back fast, has improved the machining efficiency of product greatly, simple structure moreover, and it is convenient to adjust, and the adaptation scope is wide.

The first reversing valve 6 is provided with a first position, a middle second position and a third position, the first position enables the main oil inlet 1 to be communicated with the rodless cavity 43 of the driving oil cylinder 4, the third position enables the main oil inlet 1 to be communicated with the rod cavity 44 of the driving oil cylinder 4, and the oil outlet of the rotary motor 5 is communicated with the rodless cavity 43 of the driving oil cylinder 4 through the first reversing valve 6 when the first reversing valve 6 is located at the second position. Specifically, the adjusting device 8 includes a throttle valve 81, and the opening size of the throttle valve 81 is adjustable. The throttling valve is an adjustable throttling valve, namely, the throttling valve is adjusted to realize the adjustment of the pressure oil flowing into the rodless cavity, so that the retreating speed of the screw rod can be adjusted as required, and the production efficiency of products can be improved.

The regulating device 8 comprises a third directional control valve 82, the third directional control valve 82 having a first position in which it is open and connected to the tank 2 and a second position in which it is closed, the third directional control valve 82 being arranged in parallel with the throttle valve 81. The setting of third switching-over valve still can make the screw rod passively retreat when it is in the first position for product adaptation wide range also can let out oil fast simultaneously, reduces the energy consumption.

The regulating device 8 comprises an electric proportional regulating valve. Of course, an electric proportional control valve can be used to adjust the back pressure, which is a further embodiment of the present invention (not shown in the drawings), and has a simple structure and convenient and reliable adjustment.

The third direction valve 82 is a two-position two-way direction valve. Specifically, the first direction valve 6, the second direction valve 7, and the third direction valve 82 are all electromagnetic direction valves. The second reversing valve 7 has a first position for communicating the main oil inlet 1 with the rotary motor 5 and a second position for stopping. Specifically, the first reversing valve 6 is a three-position four-way reversing valve, and the second reversing valve 7 is a two-position four-way reversing valve.

The invention is further explained with reference to the accompanying drawings:

referring to fig. 2, the screw is moved backward at a speed that is somewhat passive depending on the processing requirements of the plastic article. At the moment, the first reversing valve is located at the second position (middle position), the second reversing valve is located at the first position (open), the third reversing valve is located at the first position (open), the screw rod rotates and moves backwards along with the driving of the rotary motor, the rodless cavity forms vacuum, hydraulic oil passively enters the rodless cavity, the rod cavity discharges oil, the backward movement speed of the screw rod is determined according to the rotation speed of the screw rod, and the backward movement speed of the screw rod is irrelevant to the opening size of the oil return throttling valve.

Referring to fig. 3, the backward moving speed of the screw is slightly required to make the screw actively move easily and quickly according to the process requirements of the plastic products. The second reversing valve and the third reversing valve are both powered on, so that the second reversing valve is located at the first position (opened), the third reversing valve is located at the second position (closed), at the moment, the first reversing valve is located at the second position (middle position), the rotary motor rotates to drive the screw rod to rotate, the rodless cavity actively feeds oil, the backward moving speed of the screw rod and the piston rod is related to the adjustment depth of the throttle valve, and the adjustment mode can be adjusted manually or in other modes. Generally, during manual adjustment, the larger the back pressure of the screwed-in oil returning is, the larger the pressure and flow of the rodless cavity is, the higher the active pushing force is, and the higher the backward moving speed of the screw rod is, the rod cavity is in an oil discharging state, and the screw rod moves backward along with the piston rod. A small portion of the oil flows back to the tank through the throttle valve.

Referring to fig. 4, the injection state refers to the forward movement of the screw rod after the pressurized oil enters the rod chamber. The piston and the piston rod in the oil cylinder are fixed into a whole, a bearing, a retaining shoulder and other structures are arranged at the position of the screw rod and the piston rod, and the screw rod can synchronously and linearly move with the piston rod and can relatively rotate. According to the process requirement, when the rotation of the rotary motor is stopped, the next injection working state is entered, the first reversing valve is electrified to be at the third position, and the third reversing valve is in the non-electrified state (the first position). When pressure oil enters the rod cavity, return oil of the rodless cavity is discharged to the oil tank and is not limited by the opening amount of the throttle valve, most of the oil flows to the oil tank from the passage of the third reversing valve, and the small part of the oil flows to the oil tank from the throttle valve, so that the oil return resistance is reduced.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The skilled person should understand that: although the present invention has been described in accordance with the above embodiments, the inventive concept is not limited to this embodiment, and any modification of the inventive concept will be included in the scope of the patent claims.

Claims

1. An injection molding machine oil return backpressure adjusting system comprises a main oil inlet (1), an oil tank (2), a screw rod (3), a driving oil cylinder (4) and a rotary motor (5) used for driving the screw rod (3) to rotate, wherein the driving oil cylinder (4) comprises a cylinder body (41) and a piston rod (42) used for driving the screw rod (3) to do linear motion, the piston rod (42) divides the space in the cylinder body (41) into a rodless cavity (43) and a rod cavity (44), the injection molding machine oil return backpressure adjusting system is characterized by further comprising a first reversing valve (6), a second reversing valve (7) and an adjusting device (8), the main oil inlet (1) is connected with the driving oil cylinder (4) through the first reversing valve (6), the main oil inlet (1) is connected with the rotary motor (5) through the second reversing valve (7), and the oil outlet of the rotary motor (5) is respectively connected with the rodless cavity (43) and the adjusting device (8) of the driving oil cylinder (4) and is adjusted through the adjusting device (8) Pressure oil entering the rodless chamber (43).

2. The injection molding machine oil return back pressure regulating system according to claim 1, characterized in that the first direction valve (6) has a first position for communicating the main oil inlet (1) with the rodless cavity (43) of the drive cylinder (4), a second position of the neutral position, and a third position for communicating the main oil inlet (1) with the rod cavity (44) of the drive cylinder (4), and the oil outlet of the rotary motor (5) is communicated with the rodless cavity (43) of the drive cylinder (4) through the first direction valve (6) when the first direction valve (6) is in the second position.

3. The system for adjusting the oil return back pressure of the injection molding machine as claimed in claim 2, wherein the adjusting device (8) comprises a throttle valve (81), and the opening size of the throttle valve (81) is adjustable.

4. An injection molding machine oil return back pressure regulating system as claimed in claim 3, characterized in that the regulating device (8) comprises a third direction changing valve (82), the third direction changing valve (82) has a first position of opening connection with the oil tank (2) and a second position of closing, and the third direction changing valve (82) is arranged in parallel with the throttle valve (81).

5. An injection molding machine oil return back pressure regulating system according to claim 2, characterized in that the regulating device (8) comprises an electric proportional regulating valve.

6. The system of claim 4, wherein the third direction valve (82) is a two-position, two-way direction valve.

7. The oil return back pressure regulating system of the injection molding machine as claimed in claim 4, wherein the first direction valve (6), the second direction valve (7) and the third direction valve (82) are all electromagnetic direction valves.

8. An injection molding machine oil return back pressure regulating system as claimed in claim 2 or 3, characterized in that said second direction valve (7) has a first position for connecting the main oil inlet (1) to the rotary motor (5) and a second position for blocking.

9. The injection molding machine oil return back pressure regulating system according to claim 1, characterized in that the first reversing valve (6) is a three-position four-way reversing valve, and the second reversing valve (7) is a two-position four-way reversing valve.