阅读说明：本技术 一种用于加快pet原料成型的液压控制回路 (Hydraulic control loop for accelerating forming of PET raw material ) 是由 周腾超 俞诤 徐炜杰 于 2021-07-05 设计创作，主要内容包括：本发明公开了一种用于加快PET原料成型的液压控制回路,其包括注射油路、储料油路、保压油路,保压油路中设置有保压进退油缸和阀芯开关油缸,注射油路完成注射后保压油路开始工作,阀芯开关油缸的活塞杆顶出用于阻断注塑机中的喷嘴与料筒之间的通道,阀芯开关油缸的活塞杆顶出到位后保压进退油缸的活塞杆顶出进行保压,同时储料油路进行原料塑化储料,实现保压和储料同步,保压结束后保压进退油缸的活塞杆退回、阀芯开关油缸的活塞杆退回,同时储料油路储料结束注射油路进行射退动作；优点是其缩短了PET原料成型的生产周期,且降低了生产成本。(The invention discloses a hydraulic control loop for accelerating the forming of a PET (polyethylene terephthalate) raw material, which comprises an injection oil path, a storage oil path and a pressure maintaining oil path, wherein the pressure maintaining oil path is internally provided with a pressure maintaining advance and retreat oil cylinder and a valve core switch oil cylinder; the method has the advantages that the production period of PET raw material forming is shortened, and the production cost is reduced.)

1. The utility model provides a be used for accelerating fashioned hydraulic control return circuit of PET raw materials, includes injection oil circuit and storage oil circuit, its characterized in that: still include the pressurize oil circuit, the pressurize oil circuit in be provided with pressurize advance and retreat hydro-cylinder and case switch cylinder, the injection oil circuit accomplish the injection back the pressurize oil circuit begin to work, the piston rod of case switch cylinder ejecting be used for blocking the nozzle in the injection molding machine and the passageway between the feed cylinder, the piston rod of case switch cylinder ejecting target in place the piston rod of pressurize advance and retreat hydro-cylinder ejecting carry out the pressurize, simultaneously the storage oil circuit carry out raw materials plastify storage, realize that pressurize and storage are synchronous, the pressurize end the piston rod of pressurize advance and retreat hydro-cylinder return, the piston rod of case switch cylinder return, simultaneously storage oil circuit storage end the injection oil circuit jet and retreat the action.

2. The hydraulic control circuit for accelerating the forming of PET stock according to claim 1, wherein: the hydraulic control loop further comprises an oil tank, the injection oil line, the storage oil line and the pressure maintaining oil line share the oil tank, the pressure maintaining oil line consists of a variable pump motor set, a first electromagnetic reversing valve, a second electromagnetic reversing valve, a pressure maintaining advancing and retreating oil cylinder and a valve core switch oil cylinder, an oil inlet of the variable pump motor set is communicated with the oil tank, an oil outlet of the variable pump motor set is respectively communicated with an oil inlet of the first electromagnetic reversing valve and an oil inlet of the second electromagnetic reversing valve, an oil return port of the first electromagnetic reversing valve and an oil return port of the second electromagnetic reversing valve are respectively communicated with the oil tank, a first working oil port of the first electromagnetic reversing valve is communicated with a rod cavity of the pressure maintaining advancing and retreating oil cylinder, a second working oil port of the first electromagnetic reversing valve is communicated with a rodless cavity of the pressure maintaining oil cylinder, and a first working oil port of the second electromagnetic directional valve is communicated with a rod cavity of the valve core switching oil cylinder, and a second working oil port of the second electromagnetic directional valve is communicated with a rodless cavity of the valve core switching oil cylinder.

3. The hydraulic control circuit for accelerating the forming of PET stock according to claim 2, wherein: the first electromagnetic reversing valve is a three-position four-way electromagnetic reversing valve, and the second electromagnetic reversing valve is a two-position four-way electromagnetic reversing valve.

Technical Field

The invention relates to a technology for accelerating the forming of a PET (polyethylene terephthalate) raw material, in particular to a hydraulic control loop for accelerating the forming of the PET raw material.

Background

PET (polyethylene terephthalate) is a material that is highly crystalline, colorless, transparent, and extremely tough. The shrinkage rate of the PET raw material is large, a synchronous material storage and pressure maintaining method is usually adopted for accelerating the forming of the PET raw material and shortening the production period in the existing injection molding industry, and the existing injection molding industry is usually realized by adopting an electric pre-molding mode, but the cost realized by adopting the electric pre-molding mode is extremely high, and the cost performance is not high; in addition, the electric preplasticizing method needs to be provided with a hydraulic nozzle so as to separate the hydraulic nozzle from the material in the charging barrel, but the hydraulic nozzle needs an additional hydraulic system for control, and the price is high.

Disclosure of Invention

The invention aims to provide a hydraulic control loop for accelerating the forming of a PET (polyethylene terephthalate) raw material, which shortens the production period of the forming of the PET raw material and reduces the production cost.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a be used for accelerating fashioned hydraulic control return circuit of PET raw materials, includes injection oil circuit and storage oil circuit, its characterized in that: still include the pressurize oil circuit, the pressurize oil circuit in be provided with pressurize advance and retreat hydro-cylinder and case switch cylinder, the injection oil circuit accomplish the injection back the pressurize oil circuit begin to work, the piston rod of case switch cylinder ejecting be used for blocking the nozzle in the injection molding machine and the passageway between the feed cylinder, the piston rod of case switch cylinder ejecting target in place the piston rod of pressurize advance and retreat hydro-cylinder ejecting carry out the pressurize, simultaneously the storage oil circuit carry out raw materials plastify storage, realize that pressurize and storage are synchronous, the pressurize end the piston rod of pressurize advance and retreat hydro-cylinder return, the piston rod of case switch cylinder return, simultaneously storage oil circuit storage end the injection oil circuit jet and retreat the action. Whether a channel between a nozzle and a charging barrel in the injection molding machine is blocked or not in specific implementation can be realized by installing a travel switch on a cylinder body of a valve core switch oil cylinder, the travel switch is triggered when a piston rod of the valve core switch oil cylinder is ejected to the proper position, and a computer terminal receives a signal of the travel switch to confirm that the piston rod of the valve core switch oil cylinder is ejected to the proper position.

The hydraulic control loop further comprises an oil tank, the injection oil line, the storage oil line and the pressure maintaining oil line share the oil tank, the pressure maintaining oil line consists of a variable pump motor set, a first electromagnetic reversing valve, a second electromagnetic reversing valve, a pressure maintaining advancing and retreating oil cylinder and a valve core switch oil cylinder, an oil inlet of the variable pump motor set is communicated with the oil tank, an oil outlet of the variable pump motor set is respectively communicated with an oil inlet of the first electromagnetic reversing valve and an oil inlet of the second electromagnetic reversing valve, an oil return port of the first electromagnetic reversing valve and an oil return port of the second electromagnetic reversing valve are respectively communicated with the oil tank, a first working oil port of the first electromagnetic reversing valve is communicated with a rod cavity of the pressure maintaining advancing and retreating oil cylinder, a second working oil port of the first electromagnetic reversing valve is communicated with a rodless cavity of the pressure maintaining oil cylinder, and a first working oil port of the second electromagnetic directional valve is communicated with a rod cavity of the valve core switching oil cylinder, and a second working oil port of the second electromagnetic directional valve is communicated with a rodless cavity of the valve core switching oil cylinder. The pressure maintaining advance and retreat oil cylinder and the valve core opening and closing oil cylinder are controlled by an independent pressure maintaining motor in the variable displacement pump motor set.

The first electromagnetic reversing valve is a three-position four-way electromagnetic reversing valve, and the second electromagnetic reversing valve is a two-position four-way electromagnetic reversing valve.

Compared with the prior art, the invention has the advantages that:

the pressure maintaining oil way is used for replacing an electric pre-molding structure to realize synchronization of pressure maintaining and material storing, the piston rod of the pressure maintaining advance and retreat oil cylinder is ejected out for pressure maintaining after the injection oil way finishes injection and the piston rod of the valve core switch oil cylinder is ejected out in place, meanwhile, the material storing oil way performs raw material plasticizing and material storing, synchronization of pressure maintaining and material storing is realized, and on the premise of shortening the production period of PET raw material molding, the hydraulic control mode of the pressure maintaining oil way greatly reduces production cost.

Drawings

FIG. 1 is a schematic diagram of a pressure holding oil circuit in a hydraulic control circuit of the present invention;

FIG. 2 is a schematic diagram of the hydraulic control circuit of the present invention;

fig. 3 is a schematic diagram of the operation of the hydraulic control circuit of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

The invention provides a hydraulic control loop for accelerating PET raw material forming, as shown in figures 1 and 2, comprising an injection oil path 1, a storage oil path 9, an oil tank 2 and a pressure maintaining oil path 3, wherein the injection oil path 1, the storage oil path 9 and the pressure maintaining oil path 3 share the oil tank 2, the pressure maintaining oil path 3 consists of a variable pump motor group P1, a first electromagnetic directional valve V1, a second electromagnetic directional valve V2, a pressure maintaining advance and retreat oil cylinder 4 and a valve core switch oil cylinder 5, an oil inlet of the variable pump motor group P1 is communicated with the oil tank 2, an oil outlet of the variable pump motor group P1 is respectively communicated with an oil inlet P port of a first electromagnetic directional valve V1 and an oil inlet P port of a second electromagnetic directional valve V2, an oil return port T port of the first electromagnetic directional valve V1 and an oil return port T of the second electromagnetic directional valve V2 are respectively communicated with the oil tank 2, a working oil port A of a first electromagnetic directional valve V1 is communicated with a rod cavity 41 of a pressure maintaining oil inlet cylinder 4, a second working oil port, namely a port B, of the first electromagnetic directional valve V1 is communicated with a rodless cavity 42 of the pressure maintaining advance and retreat oil cylinder 4, a first working oil port, namely a port A, of the second electromagnetic directional valve V2 is communicated with a rod cavity 51 of the spool switch oil cylinder 5, and a second working oil port, namely a port B, of the second electromagnetic directional valve V2 is communicated with a rodless cavity 52 of the spool switch oil cylinder 5.

In this embodiment, the first electromagnetic directional valve V1 is a three-position four-way electromagnetic directional valve, and the second electromagnetic directional valve V2 is a two-position four-way electromagnetic directional valve; the variable pump motor group P1 adopts the prior art; the pressure maintaining advance and retreat oil cylinder 4 and the valve core switch oil cylinder 5 both adopt the existing oil cylinders.

The working principle of the hydraulic control loop is as follows: as shown in fig. 3, after mold closing, the pressure maintaining oil circuit 3 starts to work after the injection oil circuit 1 finishes injection, the piston rod of the valve core switch oil cylinder 5 is ejected out to block a channel between a nozzle (a common nozzle) and a material barrel in the injection molding machine, i.e. the nozzle in the injection molding machine is separated from the material in the material barrel, the piston rod of the pressure maintaining oil cylinder 4 is ejected out to maintain pressure after the piston rod of the valve core switch oil cylinder 5 is ejected to the proper position, and simultaneously the material storing oil circuit 9 carries out raw material plasticizing and material storing, so that synchronization of pressure maintaining and material storing is realized, the piston rod of the pressure maintaining oil cylinder 4 retracts after pressure maintaining, the piston rod of the valve core switch oil cylinder 5 retracts, and the material storing oil circuit 9 finishes the injection oil circuit 1 to carry out injection and retraction movement, and then mold opening and product taking out and recycling to enter the next movement. Whether a channel between a nozzle and a charging barrel in the injection molding machine is blocked or not in specific implementation can be realized by installing a travel switch on a cylinder body of a valve core switch oil cylinder 5, the travel switch is triggered when a piston rod of the valve core switch oil cylinder 5 is ejected to the proper position, and a computer terminal receives a signal of the travel switch to confirm that the piston rod of the valve core switch oil cylinder 5 is ejected to the proper position; the pressure maintaining advance and retreat oil cylinder 4 and the valve core switch oil cylinder 5 are controlled by an independent pressure maintaining motor in the variable pump motor group P1.

In this embodiment, both the injection oil path 1 and the storage oil path 9 adopt the prior art, and if the oil path structure shown in fig. 2 is adopted, V3 is a three-position four-way electromagnetic directional valve, V4 is a one-way valve, V5 is an electro-hydraulic directional valve, V6 is a cartridge valve, V7 is a two-position two-way electromagnetic directional valve, V8 is a pressure regulating valve, V9 is a two-position four-way electromagnetic directional valve, V10 is a cartridge valve, V11 is an overflow valve, P2 is a constant displacement pump motor set, M1 is a hydraulic motor, and in fig. 2, the constant displacement pump motor set P2 and the overflow valve V11 are shared by the injection oil path 1 and the storage oil path 9. The injection oil passage 1 and the stock oil passage 9 may adopt structures other than the oil passage structure shown in fig. 2.