CN117382130A - Oil supplementing control method for hydraulic injection molding machine during storage action - Google Patents
Oil supplementing control method for hydraulic injection molding machine during storage action Download PDFInfo
- Publication number
- CN117382130A CN117382130A CN202311413974.8A CN202311413974A CN117382130A CN 117382130 A CN117382130 A CN 117382130A CN 202311413974 A CN202311413974 A CN 202311413974A CN 117382130 A CN117382130 A CN 117382130A
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- CN
- China
- Prior art keywords
- control valve
- port
- oil
- direction control
- hydraulic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000001502 supplementing effect Effects 0.000 title abstract description 9
- 238000002347 injection Methods 0.000 claims abstract description 96
- 239000007924 injection Substances 0.000 claims abstract description 96
- 238000009434 installation Methods 0.000 claims abstract description 11
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 20
- 239000003921 oil Substances 0.000 description 108
- 239000010720 hydraulic oil Substances 0.000 description 10
- 239000012768 molten material Substances 0.000 description 9
- 238000005265 energy consumption Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/82—Hydraulic or pneumatic circuits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C45/5008—Drive means therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/762—Measuring, controlling or regulating the sequence of operations of an injection cycle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C2045/7606—Controlling or regulating the display unit
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an oil supplementing control method for a hydraulic injection molding machine when a material storage action is executed, wherein the installation position of a second directional control valve is not lower than the installation position of an injection cylinder, an A port of a first directional control valve is respectively communicated with an A port and a B port of the second directional control valve and the rear part of the injection cylinder, a T port of the first directional control valve is respectively communicated with a T port of the second directional control valve and an oil return pipeline, a P port of the first directional control valve and a P port of the second directional control valve are respectively communicated with a main oil way, a B port of the first directional control valve is communicated with an outlet of an overflow valve, and an inlet of the overflow valve is communicated with the front part of the injection cylinder; the hydraulic injection molding machine has the advantages that when the hydraulic injection molding machine executes the material storage action, the motor is adopted to replace the hydraulic motor, the energy utilization efficiency is improved, the rear part of the injection cylinder cannot be vacuumized in the screw rod retreating process, the screw rod can be stably retreated, the material in the material cylinder is uniform, and the stability of the material storage, subsequent injection and retreating actions can be ensured.
Description
Technical Field
The invention relates to an oil supplementing control method, in particular to an oil supplementing control method when a hydraulic injection molding machine executes a material storage action.
Background
In conventional hydraulic injection molding machines, molten material (i.e., molten plastic) is fed into a barrel from the rear end of the barrel by rotating a screw driven by a hydraulic motor when a storage operation is performed. In the storage process, the molten material can continuously move to the front end of the charging barrel and more until the storage in the charging barrel is completed. In the process of storing materials, the molten materials are extruded in the process of moving towards the front end of the charging barrel, so that reverse pressure (namely back pressure) is formed to act on the screw, when the reverse pressure is large enough, the screw is pushed to retreat, at the moment, a piston rod of an injection cylinder connected with the screw moves synchronously with the screw, and moves from the rear part of the injection cylinder to the front part of the injection cylinder, so that the front part of the injection cylinder returns to the oil tank through an oil return pipeline connected with the oil tank, and the rear part of the injection cylinder absorbs oil from the oil tank through the oil return pipeline connected with the oil tank. Because the hydraulic motor is driven by hydraulic pressure, when the hydraulic injection molding machine executes the material storage action, an oil return pipeline is filled with oil returned when the hydraulic motor runs. In the process that a piston rod of the injection cylinder moves from the rear part of the injection cylinder to the front part of the injection cylinder, the oil return quantity of the injection cylinder to the oil tank is necessarily smaller than the oil suction requirement of the rear part of the injection cylinder due to the fact that a rod cavity exists in the front part of the injection cylinder, but the oil return pipeline is full of oil return when the hydraulic motor runs, when the front part of the injection cylinder returns through the oil return pipeline, sufficient hydraulic oil flows back to the oil tank, the oil suction requirement of the rear part of the injection cylinder can be met, an oil cavity at the rear end of the injection cylinder can absorb oil in a sufficient quantity at the moment, vacuum cannot be caused, the screw rod can stably retract, the internal molten material of the feed cylinder is uniform, and therefore the stability of a storage action, a subsequent injection action and an injection action can be ensured. However, it is known that the energy utilization efficiency of the hydraulic motor is relatively low, which also results in a large energy consumption for the hydraulic injection molding machine storage operation.
In order to reduce the energy consumption of the material storage operation of the hydraulic injection molding machine, in recent years, a technician proposes to use a motor to replace a hydraulic motor to drive the screw to rotate. The material storage energy consumption of the hydraulic injection molding machine is greatly reduced, but hydraulic oil is not needed for the motor to work, an oil return pipeline is not filled with oil return, an oil tank is arranged at a lower position in the whole machine of the hydraulic injection molding machine, and vacuum can be necessarily caused to appear at the rear part of the injection oil cylinder when the oil return quantity from the front part of the injection oil cylinder to the oil tank is less than the oil absorption demand quantity at the rear part of the injection oil cylinder. Once the rear part of the injection cylinder is vacuumized, the backward movement of the screw rod is uncontrolled and cannot stably backward, and finally the instability of the storage, the subsequent injection and the injection and backward movement is caused.
Disclosure of Invention
The invention aims to solve the technical problem of providing the oil supplementing control method for the hydraulic injection molding machine, which is used for replacing a hydraulic motor when the hydraulic injection molding machine executes the material storing action, improving the energy utilization efficiency, preventing the rear part of an injection cylinder from vacuum in the screw rod retreating process, enabling the screw rod to stably retreat, enabling the molten material in the material cylinder to be uniform, and ensuring the stability of the material storing, subsequent injection and injection-retreating actions when the hydraulic injection molding machine executes the material storing action.
The technical scheme adopted for solving the technical problems is as follows: the method for controlling the oil supplement of the hydraulic injection molding machine during the material storage action is realized by arranging a first direction control valve, a second direction control valve and an overflow valve between an injection cylinder and an oil tank of the hydraulic injection molding machine, wherein the installation position of the second direction control valve in the hydraulic injection molding machine is not lower than the installation position of the injection cylinder of the hydraulic injection molding machine, the first direction control valve and the second direction control valve are controlled by a PID controller of the hydraulic injection molding machine, an A port of the first direction control valve is respectively communicated with an A port of the second direction control valve, a B port of the second direction control valve and the rear part of the injection cylinder of the hydraulic injection molding machine through pipelines, a T port of the first direction control valve is respectively communicated with a T port of the second direction control valve and an oil return pipeline of the hydraulic injection molding machine through pipelines, a P port of the first direction control valve and a P port of the second direction control valve are respectively communicated with a main oil passage of the hydraulic injection molding machine through pipelines, a B port of the first direction control valve and a P port of the second direction control valve and a P port of the injection molding machine are respectively communicated with an overflow port of the hydraulic injection molding machine, a P port of the first direction control valve and a B port of the injection molding machine is communicated with a hydraulic oil return pipeline of the hydraulic injection machine through a pipeline of the injection machine, a P port of the first direction control valve and a P port of the injection valve is communicated with a hydraulic oil return pipeline of the injection machine through a P port of the injection machine is communicated with the injection pipeline of the injection cylinder of the first direction control valve, and the injection port of the injection valve is communicated with the injection port of the injection valve through the injection port P port of the injection valve is communicated with the injection port of the injection valve, the first direction control valve is used for communicating the main oil way with the rear part of the injection cylinder of the hydraulic injection molding machine, so that the oil return pipeline always keeps a full oil state, the front part of the injection cylinder returns oil to the oil tank through the overflow valve and the oil return pipeline, the rear part of the injection cylinder is used for absorbing oil through the main oil way and the oil return pipeline respectively, the oil absorption is sufficient, and the injection cylinder cannot be vacuumized until the storage is finished.
When the oil pump runs at low speed, the running speed is 20-30% of the normal running speed.
Compared with the prior art, the hydraulic injection molding machine has the advantages that the oil supplementing control is realized by arranging the first direction control valve, the second direction control valve and the overflow valve between the injection cylinder and the oil tank of the hydraulic injection molding machine, the installation position of the second direction control valve in the hydraulic injection molding machine is not lower than the installation position of the injection cylinder of the hydraulic injection molding machine, the first direction control valve and the second direction control valve are controlled by the PID controller of the hydraulic injection molding machine, the port A of the first direction control valve is respectively communicated with the port A of the second direction control valve, the port B of the second direction control valve and the rear part of the injection cylinder of the hydraulic injection molding machine through pipelines, the port T of the first direction control valve is respectively communicated with the port T of the second direction control valve and the oil return pipeline of the hydraulic injection molding machine through pipelines, the port P of the first direction control valve and the port P of the second direction control valve are respectively communicated with the main oil way of the hydraulic injection molding machine through pipelines, the port B of the first direction control valve and the overflow valve are communicated with the front part of the injection cylinder of the hydraulic injection molding machine through pipelines, when the port A of the hydraulic injection molding machine enters the injection molding machine is in the state, the port A of the hydraulic injection molding machine is communicated with the port B of the hydraulic injection molding machine is communicated with the main oil way of the hydraulic injection machine through the first direction control machine, the port P of the port B of the first direction control valve is communicated with the main oil way of the hydraulic injection machine through pipelines, the port B of the first direction control valve is communicated with the port B of the hydraulic injection machine, the port of the hydraulic injection valve is communicated with the hydraulic injection machine, the port B port of the hydraulic injection valve is communicated with the hydraulic injection port through the port, at this moment, when the oil pump pumps hydraulic oil in the oil tank and flows out through the main oil way, the hydraulic oil can also enter the oil return pipeline, so that the oil return pipeline always keeps a full oil state, the front part of the injection oil cylinder returns oil to the oil tank through the overflow valve and the oil return pipeline, the rear part of the injection oil cylinder respectively absorbs oil through the main oil way and the oil return pipeline, the oil absorption is sufficient, the hydraulic oil can not be vacuumized until the storage is finished, and therefore, when the hydraulic injection molding machine executes the storage action, the motor is adopted to replace the hydraulic motor, the energy utilization efficiency is improved, the rear part of the injection oil cylinder can not be vacuumized in the screw rod retreating process, the screw rod can be stably retreated, the molten material in the material cylinder is uniform, and the stability of the storage, the subsequent injection and the injection retreating action can be ensured.
Drawings
Fig. 1 is a schematic diagram of an oil path structure of an oil compensation control method when a hydraulic injection molding machine of the present invention executes a material storage operation.
Detailed Description
Examples: as shown in figure 1, in the oil supplementing control method when the hydraulic injection molding machine executes the material storage action, the first direction control valve 3, the second direction control valve 4 and the overflow valve 5 are arranged between the injection cylinder 1 and the oil tank 2 of the hydraulic injection molding machine to realize the oil supplementing control in the material storage state, the installation position of the second direction control valve 4 in the hydraulic injection molding machine is not lower than the installation position of the injection cylinder 1 of the hydraulic injection molding machine, the first direction control valve 3 and the second direction control valve 4 are controlled by the PID controller 12 of the hydraulic injection molding machine, the port A of the first direction control valve 3 is respectively communicated with the port A of the second direction control valve 4, the port B of the second direction control valve 4 and the rear part a of the injection cylinder of the hydraulic injection molding machine through pipelines, the port T of the first direction control valve 3 is respectively communicated with the port T of the second direction control valve 4 and the oil return pipeline 6 of the hydraulic injection molding machine through pipelines, the port P of the first direction control valve 3 and the port B of the second direction control valve 4 are respectively communicated with the main oil circuit 7 of the hydraulic injection machine through pipelines, the port P of the first direction control valve 3 and the oil cylinder 5 of the hydraulic injection machine is communicated with the port B of the hydraulic injection machine through the pipeline 6, the port B of the injection machine is communicated with the port B of the hydraulic injection machine through the pipeline 6 of the hydraulic injection machine, the port B of the injection valve 4 is communicated with the port B of the hydraulic injection machine through the pipeline 6, the port B of the hydraulic injection machine is communicated with the port C6 through the pipeline, and the hydraulic oil return pipeline 6, the first direction control valve 3 communicates the main oil way 7 with the rear part a of the injection cylinder of the hydraulic injection molding machine, at the moment, the oil return pipeline 6 always keeps a full oil state, the front part b of the injection cylinder returns oil to the oil tank 2 through the overflow valve 5 and the oil return pipeline 6, the rear part a of the injection cylinder absorbs oil through the main oil way 7 and the oil return pipeline 6 respectively, the oil absorption is sufficient, and the vacuum cannot be pumped until the storage is finished.
In this embodiment, when the oil pump 8 runs at a low speed, its running speed is 20-30% of its normal running speed, and the specific speed is set according to the actual use requirement.
In this embodiment, when the hydraulic injection molding machine enters a storage state, the molten material in the storage hopper 9 flows into the screw 10, the PID controller 12 controls the storage driving motor 11 to drive the screw 10 to rotate, and the molten material in the storage hopper 9 is fed into the feed cylinder, meanwhile, the PID controller 12 controls the port a of the first directional control valve 3 to be communicated with the port P thereof, the port B of the first directional control valve 3 to be communicated with the port T thereof, the port a of the second directional control valve 4 to be communicated with the port P thereof, the port T of the second directional control valve 4 to be communicated with the port B thereof, and the oil pump 8 of the hydraulic injection molding machine to operate at a low speed, the injection cylinder rear portion a is communicated with the main oil path 7 and the oil return pipeline 6, the injection cylinder front portion B is communicated with the oil return pipeline 6 through the overflow valve, the installation position of the second directional control valve 4 is higher, and when the oil pump 8 operates at a low speed, because the oil return pipeline 6 is communicated with the main oil way 7, when the oil pump 8 pumps hydraulic oil in the oil tank 2 and flows out through the main oil way 7, the hydraulic oil also enters the oil return pipeline 6, so that the oil return pipeline 6 always keeps a full oil state, the front part B of the injection cylinder returns oil to the oil tank 2 through the overflow valve 5 and the oil return pipeline 6, the rear part a of the injection cylinder absorbs oil through the main oil way 7 and the oil return pipeline 6 respectively, the oil absorption is sufficient, the vacuum pumping can not be performed until the storage is finished, therefore, when the hydraulic injection molding machine executes the storage action, a motor is adopted to replace a hydraulic motor, the energy utilization efficiency is improved, the vacuum can not be generated at the rear part a of the injection cylinder in the retreating process of the screw rod 10, the screw rod 10 can be retreated stably, the molten material in the material cylinder can be even, and the stability of the storage, the follow-up injection and the injection-retreat action can be ensured.
Claims (2)
1. A method for controlling the oil filling of hydraulic injection moulding machine in the process of storing is characterized by that the oil filling control is realized by arranging the first direction control valve, the second direction control valve and overflow valve between the injection cylinder and oil tank of hydraulic injection moulding machine, the installation position of the second direction control valve in hydraulic injection moulding machine is not lower than the installation position of injection cylinder of hydraulic injection moulding machine, the first direction control valve and the second direction control valve are both controlled by PID controller of hydraulic injection moulding machine, the port A of the first direction control valve is respectively communicated with the port A of the second direction control valve, the port B of the second direction control valve and the back of injection cylinder of hydraulic injection moulding machine by pipeline, the port T of the first direction control valve is respectively communicated with the port T of the second direction control valve and the oil return pipeline of hydraulic injection moulding machine by pipeline, the port P of the first direction control valve and the port P of the second direction control valve are respectively communicated with the main oil circuit of hydraulic injection moulding machine by pipeline, the port A of the first direction control valve and the overflow valve are respectively communicated with the port A of hydraulic injection moulding machine by pipeline, the port B of the first direction control valve and the overflow valve are respectively communicated with the port A of hydraulic injection moulding machine by pipeline, the port B of the first direction control valve and the hydraulic injection machine by pipeline, the second direction control valve is used for communicating an oil return pipeline of the hydraulic injection molding machine with the rear part of an injection cylinder of the hydraulic injection molding machine, the first direction control valve is used for communicating a main oil way with the rear part of the injection cylinder of the hydraulic injection molding machine, the oil return pipeline can always keep a full oil state at the moment, the front part of the injection cylinder returns oil to the oil tank through the overflow valve and the oil return pipeline, the rear part of the injection cylinder is used for absorbing oil through the main oil way and the oil return pipeline respectively, the oil absorption is sufficient, and the vacuum pumping can not be carried out until the storage is finished.
2. The method for controlling oil replenishment in a hydraulic injection molding machine according to claim 1, wherein the oil pump is operated at a low speed of 20-30% of its normal operation speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311413974.8A CN117382130A (en) | 2023-10-27 | 2023-10-27 | Oil supplementing control method for hydraulic injection molding machine during storage action |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311413974.8A CN117382130A (en) | 2023-10-27 | 2023-10-27 | Oil supplementing control method for hydraulic injection molding machine during storage action |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117382130A true CN117382130A (en) | 2024-01-12 |
Family
ID=89469957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311413974.8A Pending CN117382130A (en) | 2023-10-27 | 2023-10-27 | Oil supplementing control method for hydraulic injection molding machine during storage action |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117382130A (en) |
-
2023
- 2023-10-27 CN CN202311413974.8A patent/CN117382130A/en active Pending
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