CN116175910A

CN116175910A - Oil circuit device and vertical injection molding machine

Info

Publication number: CN116175910A
Application number: CN202211541543.5A
Authority: CN
Inventors: 范群
Original assignee: SHENZHEN XINJINLI MACHINERY CO Ltd
Current assignee: SHENZHEN XINJINLI MACHINERY CO Ltd
Priority date: 2022-12-01
Filing date: 2022-12-01
Publication date: 2023-05-30

Abstract

The invention relates to an oil circuit device, comprising: the shooting pot is provided with a shooting cavity, a piston is movably arranged in the shooting cavity, and the piston divides the shooting cavity into a rodless cavity and a rod cavity; the bidirectional pump is provided with an oil port A and an oil port B, and the oil port A is communicated with the rodless cavity through a first oil way; the oil port B is communicated with the rod cavity through a second oil way; an oil tank; the two pressure relief oil ways are provided with safety valves, and the two pressure sensors are respectively used for detecting the oil pressure of the first oil way and the second oil way. According to the invention, through the bidirectional pumping action of the bidirectional pump, the switching of the oil return route is realized, the action of a reversing valve is replaced, and the structure is simplified; the two safety valves are utilized, so that the equipment is prevented from being damaged due to the fact that the oil pressure of the first oil way and the second oil way is too high; the first oil way and the second oil way are monitored through two pressure sensors, so that comprehensive monitoring is realized; the oil circuit device monitors an oil circuit more comprehensively, has higher safety coefficient, and controls the injection pressure and the position of the injection cylinder more accurately.

Description

Oil circuit device and vertical injection molding machine

Technical Field

The invention relates to the technical field of shooting pots, in particular to an oil way device and a vertical injection molding machine.

Background

Shooting pots are an important component of vertical injection molding machines, and their performance directly affects the performance of the injection molding machine.

The shooting pot is controlled by an oil way device to realize expansion and contraction. The switching of oil circuit is realized by the reversing valve to realize the switching of telescopic action of shooting pot, and in order to monitor the oil circuit device, a pressure sensor is usually arranged in the whole oil pressure circulation process to monitor the high pressure of oil pressure, but the oil pressure and the flow of return oil are not monitored, only the semi-closed loop effect is realized, the monitoring is incomplete, and if the condition of overlarge or blockage of the return oil pressure occurs, the deviation of the shooting pressure and the position precision of a machine table can be caused.

Disclosure of Invention

The embodiment of the invention provides an oil way device for solving the technical problem of incomplete monitoring.

An oil passage device comprising: the shooting pot is provided with a shooting cavity, a piston is movably arranged in the shooting cavity, and the piston divides the shooting cavity into a rodless cavity and a rod cavity; the bidirectional pump is provided with an oil port A and an oil port B, wherein the oil port A is communicated with the rodless cavity through a first oil way; the oil port B is communicated with the rod cavity through a second oil way, and the bidirectional pump is provided with a first state for pumping medium from the oil port A to the oil port B and a second state for pumping medium from the oil port B to the oil port A; an oil tank; two pressure relief oil ways with safety valves are arranged, one ends of the two pressure relief oil ways are respectively communicated with the first oil way and the second oil way, and the other ends of the two pressure relief oil ways extend into the oil tank; and the two pressure sensors are respectively used for detecting the oil pressure of the first oil way and the second oil way.

According to the oil way device, through the bidirectional pumping action of the bidirectional pump, the switching of an oil return route is realized, the action of a reversing valve is replaced, the structure is simplified, and the fault points are reduced; the two safety valves are utilized, so that the equipment is prevented from being damaged due to the fact that the oil pressure of the first oil way and the second oil way is too high; the first oil way and the second oil way are monitored through two pressure sensors, so that comprehensive monitoring is realized; the oil circuit device cancels the reversing valve, monitors an oil circuit more comprehensively, has higher safety coefficient, and controls the injection pressure and the position of the injection cylinder more accurately.

In one embodiment, a displacement sensor is also included for detecting displacement of the piston.

In one embodiment, the repeatability of the displacement sensor is + -0.001 mm.

In one embodiment, the device further comprises an intersection pipe, one end of the intersection pipe is connected with the two pressure relief oil ways, and the other end of the intersection pipe extends into the oil tank.

In one embodiment, the device further comprises a first oil supplementing oil way, one end of the first oil supplementing oil way is communicated with the oil tank, the other end of the first oil supplementing oil way is communicated with the second oil way, and a first one-way valve is installed on the first oil supplementing oil way and only allows media to flow from the oil tank to the direction of the second oil way.

In one embodiment, the device further comprises a second oil supplementing oil way, one end of the second oil supplementing oil way is communicated with the oil tank, the other end of the second oil supplementing oil way is communicated with the first oil way, and a second one-way valve is installed on the second oil supplementing oil way and only allows medium to flow from the oil tank towards the direction of the first oil way.

In one embodiment, the bi-directional pump employs a bi-directional plunger pump.

In one embodiment, the device further comprises a servo motor connected with the bidirectional pump, and the servo motor is switched in the forward direction and the reverse direction to realize the switching of the bidirectional pump between the first state and the second state.

In one embodiment, the device further comprises a control system, and the servo motor, the displacement sensor and the two pressure sensors are connected with the control system.

The invention also provides a vertical injection molding machine, which comprises the oil way device.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of an oil passage device of the present invention.

Reference numerals:

shooting pot 100, piston 110, rodless cavity 111, rod cavity 112;

a bi-directional pump 200, a first oil path 210, a second oil path 220, and a servo motor 230;

a fuel tank 300;

a pressure relief oil path 400, a safety valve 410 and a junction pipe 420;

a pressure sensor 500;

a first oil supplementing oil path 600 and a first check valve 610;

a second oil supplementing oil path 700 and a second one-way valve 710.

Detailed Description

In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, an embodiment of the present invention provides an oil path device including a shooting pot 100, a bi-directional pump 200, an oil tank 300, a pressure release oil path 400, and a pressure sensor 500.

The shooting pot 100 is provided with a shooting cavity, a piston 110 is movably arranged in the shooting cavity, and the piston 110 divides the shooting cavity into a rodless cavity 11 and a rod cavity 112; the bidirectional pump 200 is provided with an oil port A and an oil port B, wherein the oil port A is communicated with the rodless cavity 111 through a first oil way 21 0; the oil port B communicates with the rod chamber 112 through the second oil passage 220, and the bidirectional pump 20 has a first state in which the medium is pumped from the oil port a toward the oil port B and a second state in which the medium is pumped from the oil port B toward the oil port a; the two pressure relief oil passages 400 are arranged, the safety valves 410 are arranged on the two pressure relief oil passages 400, one ends of the two pressure relief oil passages 400 are respectively communicated with the first oil passage 21 and the second oil passage 220, and the other ends extend into the oil tank 300; the pressure sensor 50 is provided with two sensors, which are respectively attached to the first oil passage 210 and the second oil passage 220, and are respectively configured to detect the oil pressures of the first oil passage 210 and the second oil passage 22 0.

The embodiment of the invention provides an oil way device, which realizes the switching of an oil return route through the bidirectional pumping action of a bidirectional pump 200, replaces the action of a reversing valve, simplifies the structure and reduces the fault points; the two relief valves 410 are utilized, so that the damage to the equipment due to the excessively high oil pressure of the first oil passage 210 and the second oil passage 22 is avoided; the first oil way 210 and the second oil way 220 are monitored by the two pressure sensors 500, so that comprehensive monitoring is realized; the oil circuit device cancels the reversing valve, monitors an oil circuit more comprehensively, has higher safety coefficient, and controls the injection pressure and the position of the injection cylinder more accurately.

It will be appreciated that, to facilitate connection of the first oil path 210 and the second oil path 220, the outer peripheral wall of the shooting pot 100 is provided with a connector leading into the rodless chamber 111 and a connector leading into the rod chamber 11 2. Of course, the ports a and B of the bi-directional pump 20 may also be provided with connectors for connecting the first oil path 210 and the second oil path 22 0.

In some embodiments of the present invention, a displacement sensor is further included for detecting the displacement of the piston 110, thereby precisely controlling the position of the piston and the ejection distance of the piston rod. Of course the displacement sensor may detect the displacement of the piston 110 by directly detecting the piston or detecting a piston rod connected to the piston.

In a further embodiment of the invention, the repeatability of the displacement sensor is + -0.001 mm. The injection position of the piston rod of the injection cylinder in the whole movement process is accurate, so that the injection repetition precision can be +/-0.0 millimeter, and the performance of the injection molding machine is greatly improved.

In some embodiments of the present invention, the present invention further includes an intersection pipe 420, where one end of the intersection pipe 420 is connected to two pressure relief oil paths 400, and the other end extends into the oil tank 30, and the two pressure relief oil paths 40 are intersected at an intersection pipe 420 toward one end of the oil tank 300, so that the length of the pressure relief oil path 400 is reduced, and the pipeline is simplified.

In some embodiments of the present invention, the first oil supplementing line 600 is further included, one end of the first oil supplementing line 60 is communicated with the oil tank 300, the other end is communicated with the second oil line 22, a first check valve 610 is installed on the first oil supplementing line 60, and the first check valve 610 only allows the medium to flow from the oil tank 30 toward the second oil line 22 0. When the bi-directional pump 20 is in the second state in which the oil port B pumps toward the oil port a during the initial operation, the shooting pot is pushed to move to the right, the oil port B generates negative pressure, the oil can be replenished through the first oil replenishing oil path 600, and the first check valve 610 prevents the oil in the second oil path 220 from directly flowing back into the oil tank 300.

In a further embodiment of the present invention, the second oil-supplementing oil passage 700 is further included, one end of the second oil-supplementing oil passage 70 communicates with the oil tank 300, the other end communicates with the first oil passage 21, a second check valve 710 is mounted on the second oil-supplementing oil passage 70, and the second check valve 710 allows only the medium to flow from the oil tank 30 toward the first oil passage 21 0. When the bi-directional pump 20 is in the first state in which the oil port a pumps toward the oil port B during the initial operation, the shooting pot is pushed to move left, the oil port a generates negative pressure, the oil can be replenished through the second oil replenishing oil path 700, and the second check valve 710 prevents the oil in the first oil path 210 from directly flowing back into the oil tank 300.

Of course, when slight leakage occurs, the oil can be automatically replenished from the first oil replenishing oil circuit 600 or the second oil replenishing oil circuit 700, so as to ensure the normal operation of the system.

In some embodiments of the present invention, the bidirectional pump 20 is a bidirectional plunger pump, so that bidirectional pumping can be realized, and thus switching of the direction of the oil path can be realized.

In a further embodiment of the present invention, a servo motor 230 connected to the bi-directional pump 20 is further included, and the servo motor 23 is switched in forward and reverse directions to switch the bi-directional pump 20 between the first state and the second state. An output shaft of the servo motor 230 is connected with the bi-directional pump 200 to power the bi-directional pump 200, and the servo motor 230 can control the forward and reverse rotation to realize the state switching of the bi-directional pump 200.

In some embodiments of the present invention, a control system is also included, with which the servo motor 23, the displacement sensor, and both pressure sensors 500 are connected. The servo motor 230 controls the bidirectional plunger pump, meanwhile, the oil flow and pressure of the A, B port of the shooting pot can be controlled, meanwhile, two pressure sensors 500 are arranged for monitoring and feeding back a rod cavity and a rodless cavity of the shooting pot, and the control system makes timely adjustment according to the feedback; and the actual position of the shooting pot is detected by matching with the displacement sensor, so that the output pressure and the shooting position of the shooting pot in the whole movement process are accurate, and the performance of the machine is greatly improved. When the piston is suspended in the middle, the pressure sensor can detect the pressure in the oil cylinder due to dead weight and micro leakage of the pump, and then the pressure is transmitted to the control system, and the control system controls the pump to micro-rotate to keep the position of the piston in the shooting pot.

The invention also provides a vertical injection molding machine, which comprises the oil circuit device, and is good in safety and capable of realizing accurate control of shooting pot by comprehensively monitoring the oil pressure of an oil circuit.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. An oil passage device, characterized by comprising:

a shooting pot (10 0) having a shooting cavity, wherein a piston (11 0) is movably installed in the shooting cavity, and the piston (110) divides the shooting cavity into a rodless cavity (111) and a rod-containing cavity (112);

a bidirectional pump (20 0) having an oil port A and an oil port B, the oil port A being communicated with the rodless chamber (11 1) through a first oil passage (21 0); the oil port B is communicated with the rod cavity (11 2) through a second oil path (22 0), and the bidirectional pump (20 0) is provided with a first state for pumping medium from the oil port A to the oil port B and a second state for pumping medium from the oil port B to the oil port A;

a fuel tank (300);

two pressure relief oil passages (40 0) provided with safety valves (41 0), wherein one ends of the two pressure relief oil passages (40 0) are respectively communicated with the first oil passage (21 0) and the second oil passage (22 0), and the other ends of the two pressure relief oil passages extend into the oil tank (300);

and two pressure sensors (50 0) for detecting the oil pressures of the first oil passage (21 0) and the second oil passage (220), respectively.

2. The oil passage device according to claim 1, characterized by further comprising a displacement sensor for detecting a displacement of the piston (110).

3. The oil passage device according to claim 2, characterized in that the repeatability of the displacement sensor is ±0.001mm.

4. The oil passage device according to claim 1, further comprising an intersecting pipe (42 0), wherein one end of the intersecting pipe (42 0) is connected to two of the pressure relief oil passages (40 0), and the other end extends into the oil tank (300).

5. The oil passage device according to claim 1, characterized by further comprising a first oil-supplementing oil passage (60 0), one end of said first oil-supplementing oil passage (60 0) being in communication with said oil tank (30 0) and the other end being in communication with said second oil passage (22 0), a first check valve (610) being mounted on said first oil-supplementing oil passage (60 0), said first check valve (61 0) allowing a medium to flow only from said oil tank (30 0) in the direction of said second oil passage (220).

6. The oil passage device according to claim 5, characterized by further comprising a second oil supply passage (70 0), said second oil supply passage (70 0) having one end communicating with said oil tank (30 0) and the other end communicating with said first oil passage (21 0), a second check valve (710) being mounted on said second oil supply passage (70 0), said second check valve (71 0) allowing only a medium to flow from said oil tank (30 0) in the direction of said first oil passage (210).

7. The oil passage device according to claim 1 or 2, characterized in that the bidirectional pump (20 0) employs a bidirectional plunger pump.

8. The oil passage device according to claim 2, characterized by further comprising a servo motor (23 0) connected to the bi-directional pump (20 0), the servo motor (23) switching in forward and reverse directions to effect switching of the bi-directional pump (200) between a first state and a second state.

9. The oil circuit device according to claim 8, further comprising a control system, wherein the servo motor (230), the displacement sensor and the two pressure sensors (500) are connected to the control system.

10. A vertical injection molding machine comprising the oil passage device according to any one of claims 1 to 9.