CN220973235U - Mould oil circuit system and injection molding machine - Google Patents

Abstract

The utility model relates to the technical field of injection molding machines and discloses a mold oil way system and an injection molding machine, wherein when a mold is required to be opened, a main valve of a movable mold is controlled to be switched to a mold opening position, pressure oil in an oil inlet oil way enters a rod cavity of a mold closing oil cylinder through the main valve of the movable mold, pressure oil in a rodless cavity of the mold closing oil cylinder enters an oil return oil way through a movable mold valve, and as a first logic valve is arranged on the oil return oil way, the opening pressure of the first logic valve is regulated through a proportional pressure valve, the oil return oil way generates back pressure which directly acts on the rod cavity of the mold closing oil cylinder, so that the back thrust of a mold spring acting on a movable mold plate is balanced, when a pull rod and a brake disc are unlocked, the side wall of the brake disc and the pull rod are prevented from being tightly attached, the abrasion between the pull rod and the brake disc is reduced, the service life of the pull rod and the brake disc is prolonged, the stability of the movable mold plate in the mold opening process is also improved, and the product quality is prevented from being damaged.

Description

Mould oil circuit system and injection molding machine

Technical Field

The utility model relates to the technical field of injection molding machines, in particular to a mold oil circuit system and an injection molding machine.

Background

Injection molding machines are the primary molding equipment for producing plastic articles of various shapes from thermoplastic or thermosetting plastics using plastic molding dies.

The injection molding machine comprises a mold closing oil cylinder, a piston rod of the mold closing oil cylinder is connected with a movable mold plate of a molding mold, a fixed mold plate of the molding mold is fixedly connected with the injection molding machine, a pull rod is arranged on the fixed mold plate, and the pull rod can be matched with a brake disc on the movable mold plate to lock the position of the movable mold plate after penetrating through a through hole on the movable mold plate.

The movable die plate is provided with a die spring, and the die spring applies a reaction force to the movable die plate. In the opening stage, the reaction force of the die spring can enable a brake disc in a brake-contracting state to be closely attached to the outer peripheral wall of the pull rod, and friction force generated between the brake disc and the pull rod can enable the pull rod and the brake disc to be worn in the difficult opening process or in the opening process; in the mold opening stage, the reaction force of the mold spring still acts on the movable mold plate, so that the mold opening process is unstable and even the product is damaged by pulling.

Therefore, a mold oil system is needed to solve the above technical problems.

Disclosure of utility model

The utility model aims to provide a die oil circuit system and an injection molding machine, which can balance the acting force applied to a movable die plate by a die spring, reduce abrasion between a brake disc and a pull rod and improve the stability of the movable die plate in the die opening process.

To achieve the purpose, the utility model adopts the following technical scheme:

A mold oil circuit system, comprising:

the piston rod of the mold closing oil cylinder is connected with a movable mold plate of the injection molding machine;

The mould moving valve is provided with an oil inlet and an oil return port, the oil inlet is connected with an oil inlet oil way, the oil return port is communicated with a hydraulic oil tank through an oil return oil way, one of the oil inlet and the oil return port can be communicated with one of a rod cavity and a rodless cavity of the mould closing oil cylinder, and the other is communicated with the other of the rod cavity and the rodless cavity of the mould closing oil cylinder;

The valve core of the first logic valve is provided with a damping hole, and a P port of the first logic valve is communicated with a spring cavity of the first logic valve through the damping hole;

and the spring cavity of the first logic valve can be communicated with the hydraulic oil tank through the proportional pressure valve.

As an alternative technical scheme of the mould oil way system, a second logic valve is arranged on the oil inlet oil way, and an oil outlet of the second logic valve is communicated with a spring cavity of the second logic valve.

As an optional technical solution of the above mold oil circuit system, further includes:

And the rodless cavity of the mold closing oil cylinder can be selectively communicated with or disconnected from the oil return oil path through the third logic valve.

As an optional technical scheme of the above mold oil circuit system, the third logic valve is a hydraulic control valve, and the spring cavity of the third logic valve can be selectively communicated with the oil return oil circuit or the hydraulic oil tank through a directional valve.

As an alternative technical scheme of the mould oil circuit system, the mould moving valve comprises a mould moving main valve, wherein the mould moving main valve is provided with a mould opening position, a mould closing position and a mould closing holding position;

When the shifting mould main valve is in a mould closing position, a P port of the shifting mould main valve is communicated with the rod cavity, and a T port of the shifting mould main valve is communicated with the rodless cavity;

When the master valve of the shifting mould is in a mould opening position, a P port of the master valve of the shifting mould is communicated with the rodless cavity, and a T port of the master valve of the shifting mould is communicated with the rod cavity;

when the master valve of the shifting mould is in the mould closing maintaining position, the P port of the master valve of the shifting mould is disconnected from the rod cavity and the rodless cavity, and the T port of the master valve of the shifting mould is communicated with the rodless cavity.

As an optional technical scheme of the mould oil way system, the mould shifting main valve is a hydraulic control valve, the mould shifting valve further comprises a pilot valve, a P port of the pilot valve is communicated with a P port of the mould shifting main valve, the pilot valve can selectively enable one of two pilot ends of the mould shifting main valve to be communicated with the P port of the pilot valve and the other pilot end of the two pilot ends of the mould shifting main valve to be communicated with the hydraulic oil tank, or the two pilot ends of the mould shifting main valve are communicated with the hydraulic oil tank and are disconnected with the P port of the pilot valve.

As an alternative technical scheme of the mould oil way system, the mould moving main valve is provided with a mould closing pilot end and a mould opening pilot end, the mould opening pilot end is communicated with the port B of the pilot valve, and the mould closing pilot end is selectively communicated with the port A of the pilot valve or the hydraulic oil tank through a safety valve; the P port of the safety valve is communicated with the P port of the movable mould main valve;

The pilot valve is provided with a parallel position, a crossing position and a middle position, the pilot valve is in the parallel position, an A port of the pilot valve is communicated with a P port of the pilot valve, and a B port of the pilot valve is communicated with a T port of the pilot valve;

The pilot valve is positioned at a crossing position, an A port of the pilot valve is communicated with a T port of the pilot valve, and a B port of the pilot valve is communicated with a P port of the pilot valve;

the pilot valve is in the middle position, and the port A and the port B of the pilot valve are communicated with the port T of the pilot valve and are disconnected with the port P of the pilot valve.

As an optional technical scheme of the mould oil circuit system, the mould oil circuit system further comprises a main valve block, wherein an oil passage connecting an inlet of the third logic valve and a T port of the mould shifting main valve, an oil passage connecting an inlet of the first logic valve and a T port of the mould shifting main valve, an oil passage connecting a P port of the mould shifting main valve and an outlet of the second logic valve, an oil passage connecting a B port of the safety valve and a mould closing pilot end, an oil passage connecting a B port of the pilot valve and a mould opening pilot end, an oil passage connecting a rodless cavity of the mould closing oil cylinder and a B port of the mould shifting main valve, and an oil passage connecting a rod cavity of the mould closing oil cylinder and an A port of the mould shifting main valve are arranged on the main valve block.

As an optional technical scheme of the above mold oil circuit system, the third logic valve and the direction valve are located at one side of the first direction of the main valve block, and the first logic valve and the proportional pressure valve are located at the other side of the first direction of the main valve block.

In order to achieve the above purpose, the utility model also provides an injection molding machine, which further comprises a movable template, a fixed template, a mold spring, a pull rod, a brake disc and the mold oil circuit system according to any one of the above schemes;

the movable die plate and the fixed die plate are oppositely arranged along the die opening and closing direction, the movable die plate is connected with a piston rod of the die closing oil cylinder, one end of the pull rod is connected with the fixed die plate, and the other end of the pull rod is connected with the movable die plate in a sliding manner along the die opening and closing direction and can be matched with the brake disc to selectively lock or unlock the movable die plate; the die spring clamp is arranged between the movable die plate and the fixed die plate, and enables the movable die plate to have a movement trend away from the movable die plate along the die opening and closing direction.

The utility model has the beneficial effects that: when the mould is required to be opened, the mould moving main valve is controlled to switch to the mould opening position, pressure oil in the oil inlet oil path enters the rodless cavity of the mould closing oil cylinder through the mould moving main valve, the pressure oil in the rod cavity of the mould closing oil cylinder enters the oil return oil path through the mould moving valve, and the oil return oil path is provided with the first logic valve.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.

FIG. 1 is a hydraulic schematic diagram of a mold oil circuit system provided by an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a mold oil circuit system according to an embodiment of the present utility model.

In the figure:

1. A mold closing oil cylinder; 11. a rod cavity is arranged; 12. a rodless cavity; 2. a main valve of the movable mould; 3. a first logic valve; 31. a damping hole; 4. a proportional pressure valve; 5. a third logic valve; 6. a directional valve; 7. a pilot valve; 8. a safety valve; 9. a second logic valve; 10. a main valve block.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1 and 2, an embodiment of the present utility model provides a mold oil path system and an injection molding machine, the injection molding machine includes a movable mold plate, a fixed mold plate, a mold spring, a pull rod, a brake disc and a mold oil path system, wherein the movable mold plate and the fixed mold plate are oppositely arranged along a mold opening and closing direction, the mold oil path system includes a mold closing cylinder 1, a piston rod of the mold closing cylinder 1 is connected with the movable mold plate to drive the movable mold plate to reciprocate along the mold opening and closing direction, one end of the pull rod is connected with the fixed mold plate, and the other end of the pull rod is connected with the movable mold plate in a sliding manner along the mold opening and closing direction and can be matched with the brake disc to selectively lock or unlock the movable mold plate; the die spring clamp is arranged between the movable die plate and the fixed die plate, and enables the movable die plate to have a movement trend away from the movable die plate along the die opening and closing direction. As to how the lock plate and the tie rod cooperate to lock or unlock the movable mold plate, i.e. how to open and close the lock, this is a prior art in the field, and will not be described in detail here.

When the mold is closed, the movable mold plate moves along the mold opening and closing direction to be close to the fixed mold plate, and the mold springs are compressed, so that the movable mold plate has a tendency of moving away from the fixed mold plate. When the mold is opened, the movable mold plate moves along the mold opening and closing direction to be far away from the fixed mold plate, and the mold spring is gradually reset. After the die assembly is completed, the movable die plate is locked by utilizing the cooperation of the pull rod and the brake disc, so that the injection molding machine is in a die assembly holding state.

The mould oil way system comprises a mould closing oil cylinder 1, a mould moving valve, a first logic valve 3 and a proportional pressure valve 4, wherein a piston rod of the mould closing oil cylinder 1 is connected with a movable mould plate, the mould moving valve is provided with an oil inlet and an oil return port, the oil inlet is connected with an oil inlet oil way, the oil return port is communicated with a hydraulic oil tank through an oil return oil way, one of the oil inlet and the oil return port can be communicated with one of a rod cavity 11 and a rodless cavity 12 of the mould closing oil cylinder 1 by the mould moving valve, and the other is communicated with the other of the rod cavity 11 and the rodless cavity 12 of the mould closing oil cylinder 1; the first logic valve 3 is arranged on the oil return path, a damping hole 31 is arranged on a valve core of the first logic valve 3, a P port of the first logic valve 3 is communicated with a spring cavity of the first logic valve 3 through the damping hole 31, and the spring cavity of the first logic valve 3 can be communicated with a hydraulic oil tank through the proportional pressure valve 4.

Specifically, the mold shifting valve comprises a mold shifting main valve 2, wherein the mold shifting main valve 2 is provided with a mold opening position, a mold closing position and a mold closing holding position; when the movable mould main valve 2 is in a mould closing position, a P port of the movable mould main valve 2 is communicated with the rod cavity 11, and a T port of the movable mould main valve 2 is communicated with the rodless cavity 12; when the movable mould main valve 2 is in the mould opening position, the P port of the movable mould main valve 2 is communicated with the rodless cavity 12, and the T port of the movable mould main valve 2 is communicated with the rod cavity 11; when the main valve 2 is at the die-closing maintaining position, the P port of the main valve 2 is disconnected from the rod cavity 11 and the rodless cavity 12, and the T port of the main valve 2 is communicated with the rodless cavity 12. The shifting master valve 2 is illustratively a three-position four-way reversing valve.

When the die is opened, the die spring is in a compressed state, and when the die is just started to be opened, the proportional pressure valve 4 generates a back pressure, the back pressure is set according to the force provided by the spring in the spring cavity of the first logic valve 3, and the back pressure is used for balancing the reverse acting force of the die opening spring. In the die sinking process, the die shifting main valve 2 is in a die sinking position, pressure oil enters the rodless cavity 12 of the die sinking cylinder 1 through the P port of the die shifting main valve 2 and the B port of the die shifting main valve 2, the pressure oil in the rod cavity 11 of the die sinking cylinder 1 passes through the A port of the die shifting main valve 2, the T port of the die shifting main valve 2 and an oil return oil way to the inlet of the first logic valve 3, the pressure oil at the inlet of the first logic valve 3 can enter the spring cavity of the first logic valve 3 through the damping hole 31, and the spring cavity of the first logic valve 3 can have certain oil pressure by adjusting the opening pressure of the proportional pressure valve 4, so that the purpose of adjusting the opening pressure of the first logic valve 3 is achieved, and the back pressure of the oil return oil way is realized; the back pressure in the oil return oil way directly acts on the rod cavity 11 of the die closing oil cylinder 1, so that the reverse acting force of the die spring is balanced, the side walls of the brake disc and the brake disc are prevented from being clung when the brake disc is unlocked, the abrasion between the brake disc and the brake disc is reduced or even eliminated, the service lives of the brake disc and the brake disc are prolonged, the stability of the moving die plate in the die opening process can be improved, the products are prevented from being damaged by pulling, and the product quality is improved; after the first logic valve 3 is opened, the pressure oil in the return oil path will flow back to the hydraulic oil tank through the first logic valve 3.

Further, the shifting formwork main valve 2 is a hydraulic control valve, the shifting formwork valve further comprises a pilot valve 7, a P port of the pilot valve 7 is communicated with a P port of the shifting formwork main valve 2, and the pilot valve 7 can selectively enable one of two pilot ends of the shifting formwork main valve 2 to be communicated with the P port of the pilot valve 7 and the other pilot end to be communicated with a hydraulic oil tank, or both pilot ends of the pilot valve 7 are communicated with the hydraulic oil tank and are disconnected with the P port of the pilot valve 7. Illustratively, the pilot valve 7 is a three-position four-way reversing valve, and the pilot valve 7 is a solenoid valve.

The mould oil circuit system also comprises a safety valve 8, the mould moving main valve 2 is provided with a mould closing pilot end and a mould opening pilot end, the mould opening pilot end is communicated with the port B of the pilot valve 7, and the mould closing pilot end is selectively communicated with the port A of the pilot valve 7 or the hydraulic oil tank through the safety valve 8; the P port of the safety valve 8 is communicated with the P port of the movable mould main valve 2; the pilot valve 7 is provided with a parallel position, a crossing position and a middle position, the pilot valve 7 is in the parallel position, an A port of the pilot valve 7 is communicated with a P port of the pilot valve 7, and a B port of the pilot valve 7 is communicated with a T port of the pilot valve 7; the pilot valve 7 is in a crossing position, an A port of the pilot valve 7 is communicated with a T port of the pilot valve 7, and a B port of the pilot valve 7 is communicated with a P port of the pilot valve 7; the pilot valve 7 is in the middle position, and the port A and the port B of the pilot valve 7 are communicated with the port T of the pilot valve 7 and are disconnected with the port P of the pilot valve 7. The safety valve 8 is illustratively a solenoid valve.

When the open-die pilot end is used for oil feeding and the die-closing pilot end is used for oil discharging, the die-moving main valve 2 is switched to the die-opening position, the rodless cavity 12 of the die-closing oil cylinder 1 is used for oil feeding, and the rod cavity 11 of the die-closing oil cylinder 1 is used for oil discharging. When the oil is discharged from the die opening pilot end and the oil is discharged from the die closing pilot end, the die moving main valve 2 is switched to the die closing position, the oil is discharged from the rod cavity 11 of the die closing oil cylinder 1, and the oil is discharged from the rodless cavity 12 of the die closing oil cylinder 1.

The safety valve 8 is generally positioned at the left position, when the pilot valve 7 is switched to the crossing position, the pressure oil of the oil inlet oil way passes through the port P of the pilot valve 7 and the port B of the pilot valve 7 to the die opening pilot end, and the pressure oil of the die closing pilot end passes through the port B of the safety valve 8, the port P of the safety valve 8, the port A of the pilot valve 7 and the port T of the pilot valve 7 to the hydraulic oil tank, so that the die shifting main valve 2 is switched to the die opening position. If the relief valve 8 is switched to the right position, the pressure oil at the die closing pilot end passes through the port B of the relief valve 8 and the port T of the relief valve 8 to the hydraulic oil tank, thereby switching the die shifting main valve 2 to the die opening position.

When the pilot valve 7 is switched to the parallel position, the pressure oil of the oil inlet oil path is switched to the die closing pilot end through the P port of the pilot valve 7, the A port of the pilot valve 7, the P port of the safety valve 8 and the B port of the safety valve 8, and the pressure oil of the die opening pilot end is switched to the hydraulic oil tank through the B port of the pilot valve 7 and the T port of the pilot valve 7, so that the die moving main valve 2 is switched to the die closing position. When the relief valve 8 is shifted to the right position, the pressure oil at the clamp pilot port passes through the port B of the relief valve 8 and the port T of the relief valve 8 to the hydraulic tank, thereby shifting the master valve 2 to the clamp holding position.

When the pilot valve 7 is switched to the middle position, the pressure oil at the open-mode pilot end passes through the port B of the pilot valve 7 and the port T of the pilot valve 7 to a hydraulic oil tank; the pressure oil at the die clamping pilot end passes through the port B of the safety valve 8, the port P of the safety valve 8, the port A of the pilot valve 7 and the port T of the pilot valve 7 to the hydraulic oil tank, so that the die shifting main valve 2 is switched to the die clamping holding position. When the relief valve 8 is shifted to the right position, the pressure oil at the clamp pilot port passes through the port B of the relief valve 8 and the port T of the relief valve 8 to the hydraulic tank, thereby shifting the master valve 2 to the clamp holding position.

Further, a second logic valve 91 is arranged on the oil inlet oil path, and the oil outlet of the second logic valve 9 is communicated with the spring cavity of the second logic valve 9.

When the die is closed, the pressure oil opens the second logic valve 9 to enter the P port of the master valve 2 of the die shifting and the P port of the pilot valve 7, the pilot valve 7 is switched to the right position, when the safety valve 8 is positioned at the left position, the P port of the safety valve 8 is communicated with the B port of the safety valve 8, the pressure oil passes through the P port of the pilot valve 7, the A port of the pilot valve 7, the P port of the safety valve 8 and the B port of the safety valve 8 to the die closing pilot end, the die opening pilot end is communicated with a hydraulic oil tank through the B port of the pilot valve 7 and the T port of the pilot valve 7, so that the master valve 2 of the die shifting is switched to the die closing position, the pressure oil passes through the P port of the master valve 2 of the die shifting and the A port of the master valve 2 to the rod cavity 11 of the die closing cylinder 1, the pressure oil in the rodless cavity 12 of the die closing cylinder 1 passes through the B port of the master valve 2 of the die shifting and the T port of the master valve 2 of the die shifting and the oil return path to the P port of the first logic valve 3, and the opening pressure of the proportional pressure valve 4 is controlled to be zero in the process, namely the proportional pressure valve 4 is controlled to be in the normally open state, the pressure oil return pressure oil in the oil return path, the pressure oil return is the pressure oil is in the mode, so that the pressure oil in the cavity of the first logic valve is in the cavity of the first logic valve 3 and the cavity is closed, and the pressure spring in the pressure oil return pressure in the cavity is closed to the first pressure oil cylinder and the pressure return valve 3. When the movable die plate moves to the low-pressure die protecting section to lock the pull rod and the brake disc, the reverse acting force can enable a piston rod of the die clamping cylinder 1 to have a stretching trend, oil pressure in a rod cavity 11 of the die clamping cylinder 1 is increased, oil outlet pressure of the second logic valve 9 is increased, the oil outlet of the second logic valve 9 is communicated with a spring cavity of the second logic valve 9, pressure in the spring cavity of the second logic valve 9 is increased, when the pressure in the spring cavity of the second logic valve 9 is larger than the pressure of an oil inlet of the second logic valve 9, the second logic valve 9 is closed, so that an oil inlet oil way is disconnected, and at the moment, the reverse acting force of the die spring on the movable die plate can be balanced by acting force of the oil pressure in the rod cavity 11 of the die clamping cylinder 1, rebound of the movable die plate cannot occur, and stable brake is further realized.

In addition, the safety valve 8 is used for monitoring the closing operation, so that the closing operation is prevented when the safety valve is opened, and the safety of operators is ensured.

Further, the mold oil path system further includes a third logic valve 5, and the rodless cavity 12 of the mold clamping cylinder 1 can be selectively communicated with the oil return path through the third logic valve 5. The third logic valve 5 is a pilot operated valve, and the spring chamber of the third logic valve 5 can be selectively communicated with an oil return passage or a hydraulic oil tank through a directional valve 6. The directional valve 6 is illustratively a two-position solenoid directional valve.

In the mold opening process, the mold moving main valve 2 is positioned at the mold opening position, the rodless cavity 12 of the mold closing oil cylinder 1 is filled with oil, and the rodless cavity 12 of the mold closing oil cylinder 1 is discharged with oil. When the die opening is started, the direction valve 6 is positioned at the right position, so that the spring cavity of the third logic valve 5 is communicated with the oil return path, and the third logic valve 5 is in a closed state under the action of the self spring. When the movable die plate and the fixed die plate are completely separated, the direction valve 6 is switched to the left position, the opening pressure of the first logic valve 3 is increased through the proportional pressure valve 4, the direction valve 6 enables the spring cavity of the third logic valve 5 to be communicated with the hydraulic oil tank, the spring cavity of the third logic valve 5 is depressurized, at the moment, the opening pressure of the third logic valve 5 is smaller than the opening pressure of the first logic valve 3, when the third logic valve 5 is opened, the first logic valve 3 is still in a closed state, and pressure oil in the rod cavity 11 of the die clamping cylinder 1 enters the rodless cavity 12 of the die clamping cylinder 1 through the port A of the die moving main valve 2, the port T of the die moving main valve 2, an oil return path and the third logic valve 5, so that differential quick die opening is realized.

Further, as shown in fig. 2, the mold oil path system further includes a main valve block 10, and the main valve block 10 is provided with an oil path connecting the inlet of the third logic valve 5 and the T port of the mold shifting main valve 2, an oil path connecting the inlet of the first logic valve 3 and the T port of the mold shifting main valve 2, an oil path connecting the P port of the mold shifting main valve 2 and the outlet of the second logic valve 9, an oil path connecting the B port of the relief valve 8 and the mold closing pilot end, an oil path connecting the B port of the pilot valve 7 and the mold opening pilot end, an oil path connecting the rodless cavity 12 of the mold closing cylinder 1 and the B port of the mold shifting main valve 2, and an oil path connecting the rod cavity 11 of the mold closing cylinder 1 and the a port of the mold shifting main valve 2. By the design, the integration level of the die oil circuit system can be improved, and the occupied space of the whole die oil circuit system is reduced.

Illustratively, the third logic valve 5, directional valve 6 is located on one side of the main valve block 10 in the first direction, and the first logic valve 3, proportional pressure valve 4 is located on the other side of the main valve block 10 in the first direction; the shifting master valve 2, the pilot valve 7 and the relief valve 8 are located on one side of the master valve block 10 in the second direction. The port P and the port T shown in fig. 2 are respectively located at one side of the third direction of the main valve block 10, the first direction, the second direction and the third direction are perpendicular to each other, the port P shown in fig. 2 is connected with a hydraulic pump, the port T shown in fig. 2 is connected with a hydraulic tank, the port a shown in fig. 2 is connected with a rod cavity 11 of the mold clamping cylinder 1, and the port B shown in fig. 2 is connected with a rodless cavity 12 of the mold clamping cylinder 1.

When the piston rod of the mold clamping cylinder 1 moves in the direction indicated by the arrow in fig. 1, the movable platen is gradually moved away from the fixed platen in the mold opening and closing direction. When the piston rod of the mold closing cylinder moves in the reverse direction of the arrow direction in fig. 1, the movable mold plate gradually approaches to the fixed mold plate along the mold opening and closing direction.

Furthermore, the foregoing description of the preferred embodiments and the principles of the utility model is provided herein. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (10)

1. Mould oil circuit system, its characterized in that includes:

The injection molding machine comprises a mold closing oil cylinder (1), wherein a piston rod of the mold closing oil cylinder (1) is connected with a movable mold plate of the injection molding machine;

The mould moving valve is provided with an oil inlet and an oil return port, the oil inlet is connected with an oil inlet oil way, the oil return port is communicated with a hydraulic oil tank through an oil return oil way, the mould moving valve can enable one of the oil inlet and the oil return port to be communicated with one of a rod cavity (11) and a rodless cavity (12) of the mould closing oil cylinder (1), and the other is communicated with the other of the rod cavity (11) and the rodless cavity (12) of the mould closing oil cylinder (1);

The first logic valve (3) is arranged on the oil return oil path, a damping hole (31) is formed in a valve core of the first logic valve (3), and a P port of the first logic valve (3) is communicated with a spring cavity of the first logic valve (3) through the damping hole (31);

-a proportional pressure valve (4), the spring chamber of the first logic valve (3) being able to communicate with the hydraulic tank via the proportional pressure valve (4).

2. The mould oil circuit system according to claim 1, characterized in that a second logic valve (9) is arranged on the oil inlet circuit, and the oil outlet of the second logic valve (9) is communicated with the spring cavity of the second logic valve (9).

3. The mold oil circuit system of claim 2, further comprising:

And the rodless cavity (12) of the die clamping cylinder (1) can be selectively communicated with or disconnected from the oil return passage through the third logic valve (5).

4. A mould oil circuit system according to claim 3, characterized in that the third logic valve (5) is a pilot operated valve, the spring chamber of the third logic valve (5) being selectively communicable with the return oil circuit or with the hydraulic oil tank via a directional valve (6).

5. The mold oil circuit system according to claim 4, wherein the mold shift valve comprises a mold shift main valve (2), the mold shift main valve (2) having a mold opening position, a mold closing position, and a mold closing holding position;

When the movable mould main valve (2) is in a mould closing position, a P port of the movable mould main valve (2) is communicated with the rod cavity (11), and a T port of the movable mould main valve (2) is communicated with the rodless cavity (12);

when the movable mould main valve (2) is in a mould opening position, a P port of the movable mould main valve (2) is communicated with the rodless cavity (12), and a T port of the movable mould main valve (2) is communicated with the rod cavity (11);

When the movable mould main valve (2) is in a mould closing maintaining position, a P port of the movable mould main valve (2) is disconnected from the rod cavity (11) and the rodless cavity (12), and a T port of the movable mould main valve (2) is communicated with the rodless cavity (12).

6. The mold oil circuit system according to claim 5, characterized in that the mold shifting main valve (2) is a hydraulic control valve, the mold shifting valve further comprises a pilot valve (7), a P port of the pilot valve (7) is communicated with a P port of the mold shifting main valve (2), the pilot valve (7) can selectively enable one of two pilot ends of the mold shifting main valve (2) to be communicated with the P port of the pilot valve (7) and the other one to be communicated with the hydraulic oil tank, or both pilot ends of the mold shifting main valve (2) to be communicated with the hydraulic oil tank and both pilot ends to be disconnected from the P port of the pilot valve (7).

7. The mold oil circuit system according to claim 6, characterized in that the moving mold main valve (2) has a mold closing pilot end and a mold opening pilot end, the mold opening pilot end being in communication with port B of the pilot valve (7), the mold closing pilot end being in selective communication with port a of the pilot valve (7) or the hydraulic tank through a relief valve (8); the P port of the safety valve (8) is communicated with the P port of the movable mould main valve (2);

The pilot valve (7) is provided with a parallel position, a crossing position and a middle position, the pilot valve (7) is in the parallel position, an A port of the pilot valve (7) is communicated with a P port of the pilot valve (7), and a B port of the pilot valve (7) is communicated with a T port of the pilot valve (7);

The pilot valve (7) is positioned at a crossing position, an A port of the pilot valve (7) is communicated with a T port of the pilot valve (7), and a B port of the pilot valve (7) is communicated with a P port of the pilot valve (7);

The pilot valve (7) is in the middle position, and an A port and a B port of the pilot valve (7) are communicated with a T port of the pilot valve (7) and are disconnected with a P port of the pilot valve (7).

8. The mold oil path system according to claim 7, further comprising a main valve block (10), wherein the main valve block (10) is provided with an oil passage connecting an inlet of the third logic valve (5) and a T-port of the mold shifting main valve (2), an oil passage connecting an inlet of the first logic valve (3) and a T-port of the mold shifting main valve (2), an oil passage connecting a P-port of the mold shifting main valve (2) and an outlet of the second logic valve (9), an oil passage connecting a B-port of the relief valve (8) and the mold clamping pilot end, an oil passage connecting a B-port of the pilot valve (7) and the mold opening pilot end, an oil passage connecting a rodless chamber (12) of the mold clamping cylinder (1) and a B-port of the mold shifting main valve (2), and an oil passage connecting a rod chamber (11) of the mold clamping cylinder (1) and an a-port of the mold shifting main valve (2).

9. The mould oil circuit system according to claim 8, characterized in that the third logic valve (5), the directional valve (6) are located on one side of the main valve block (10) in the first direction, the first logic valve (3), the proportional pressure valve (4) are located on the other side of the main valve block (10) in the first direction.

10. The injection molding machine is characterized by further comprising a movable template, a fixed template, a mold spring, a pull rod, a brake disc and a mold oil circuit system according to any one of claims 1-9;

The movable die plate and the fixed die plate are oppositely arranged along the die opening and closing direction, the movable die plate is connected with a piston rod of the die closing oil cylinder (1), one end of the pull rod is connected with the fixed die plate, and the other end of the pull rod is connected with the movable die plate in a sliding manner along the die opening and closing direction and can be matched with the brake disc to selectively lock or unlock the movable die plate; the die spring clamp is arranged between the movable die plate and the fixed die plate, and enables the movable die plate to have a movement trend away from the movable die plate along the die opening and closing direction.