CN115416244A - Servo valve control mechanism of injection molding machine and system thereof - Google Patents

Servo valve control mechanism of injection molding machine and system thereof Download PDF

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Publication number
CN115416244A
CN115416244A CN202211067018.4A CN202211067018A CN115416244A CN 115416244 A CN115416244 A CN 115416244A CN 202211067018 A CN202211067018 A CN 202211067018A CN 115416244 A CN115416244 A CN 115416244A
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CN
China
Prior art keywords
module
speed value
oil cylinder
control module
preset
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.)
Pending
Application number
CN202211067018.4A
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Chinese (zh)
Inventor
季小波
陈晓周
周武彬
胡永康
吴玉林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuqiangxin Ningbo Precision Technology Co ltd
Original Assignee
Fuqiangxin Ningbo Precision Technology Co ltd
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Fuqiangxin Ningbo Precision Technology Co ltd filed Critical Fuqiangxin Ningbo Precision Technology Co ltd
Priority to CN202211067018.4A priority Critical patent/CN115416244A/en
Publication of CN115416244A publication Critical patent/CN115416244A/en
Pending legal-status Critical Current

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    • 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
    • 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
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76545—Flow rate
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76929—Controlling method
    • B29C2945/76936—The operating conditions are corrected in the next phase or cycle

Abstract

The invention relates to a servo valve control mechanism of an injection molding machine and a system thereof, wherein the injection molding machine comprises a screw, a motor for driving the screw to rotate and an oil cylinder for driving the screw to axially move; the method is characterized in that: the servo valve control mechanism is used for controlling the running speed of the oil cylinder and comprises a proportional valve which is connected with the oil cylinder and used for adjusting the running speed of the oil cylinder and an upper computer which is connected with the proportional valve and used for adjusting the size of a valve port of the proportional valve. According to the invention, a controller is cancelled, the position of the oil cylinder is directly fed back to the upper computer, and the upper computer is also used for analyzing and calculating, so that the calculation is more rapid and accurate; and the connection of the circuit is reduced, the whole wiring layout is simpler, the possibility of circuit interference is reduced, and the machine cost and the after-sale cost are greatly reduced.

Description

Servo valve control mechanism of injection molding machine and system thereof
Technical Field
The invention relates to the technical field of injection molding machines, in particular to a servo valve control mechanism of an injection molding machine and a system thereof.
Background
The injection unit of the injection molding machine is a core injection unit of the whole equipment, and the screw is a key part of the injection unit. The injection molding machine conveys and melts raw materials through a screw rod, and finally injects the raw materials into a mold for molding. Therefore, the injection screw needs to move axially and rotationally during the injection process.
At present, the power of an injection molding machine is mainly transmitted by hydraulic pressure, so that a screw rod needs to be driven by a hydraulic oil cylinder when moving axially; then, in order to ensure the injection work, the running speed of the hydraulic oil cylinder needs to be accurately controlled, in the existing product, three signals of pressure, flow and position values are sent to a controller through an upper computer, the controller sends an instruction to a valve through internal operation, the valve outputs a valve core according to the instruction given by the controller, in the whole control process, the position or pressure value of the oil cylinder can be fed back to the controller, the controller compares the instruction of the upper computer with the feedback instruction of the oil cylinder, and then operation calibration is carried out until the instruction value of the upper computer and the feedback value of the oil cylinder are consistent.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the technical problem of providing a servo valve control mechanism of an injection molding machine and a system thereof, wherein a controller is cancelled, the position of an oil cylinder is directly fed back to an upper computer, and the upper computer is also used for analyzing and calculating, so that the calculation is more rapid and accurate; and the connection of the circuit is reduced, the whole wiring layout is simpler, the possibility of circuit interference is reduced, and the machine cost and the after-sale cost are greatly reduced.
(II) technical scheme
The invention solves the technical problem by adopting the scheme that the servo valve control mechanism of the injection molding machine comprises a screw, a motor for driving the screw to rotate and an oil cylinder for driving the screw to axially move; the servo valve control mechanism is used for controlling the running speed of the oil cylinder and comprises a proportional valve which is connected with the oil cylinder and used for adjusting the running speed of the oil cylinder and an upper computer which is connected with the proportional valve and used for adjusting the size of a valve port of the proportional valve.
Furthermore, the servo valve control mechanism also comprises a resistance ruler used for detecting the position of the oil cylinder, and the resistance ruler is electrically connected with the upper computer; the upper computer comprises a control module for analyzing and calculating the feedback of the resistance ruler.
Further, the control module comprises a PID control system.
By adopting the scheme, the controller is cancelled, the connection of lines is reduced, the whole wiring layout is simpler, the possibility of circuit interference is reduced, and the machine cost and the after-sale cost are greatly reduced.
The invention adopts the proposal that the servo valve control system of the injection molding machine comprises
The oil cylinder driving module is used for driving the screw rod to axially move;
the proportional valve control module is connected with the oil cylinder driving module and is used for controlling the axial movement speed of the oil cylinder driving module;
and the upper computer control module is respectively connected with the proportional valve control module and the oil cylinder driving module, and is used for analyzing and calculating according to the position value of the oil cylinder driving module and sending a signal to the proportional valve control module.
Furthermore, the device also comprises a position detection module which is respectively connected with the oil cylinder driving module and the upper computer control module and is used for detecting the position of the oil cylinder driving module and sending a signal to the upper computer control module.
Preferably, the position detection module includes a resistance ruler.
Further, the upper computer control module comprises a preset module and a PID control module connected with the preset module; the preset module comprises a preset speed value, the PID control module is respectively connected with the oil cylinder driving module and the proportional valve control module and is used for analyzing and calculating the position of the oil cylinder driving module to obtain an actual speed value, comparing the actual speed value with the preset speed value, and controlling the valve port of the proportional valve control module to be opened greatly if the actual speed value is smaller than the preset speed value; and if the actual speed value is greater than the preset speed value, controlling the valve port of the proportional valve control module to be closed.
Further, the PID control module includes a PID calculation unit that calculates the position of the cylinder driving module by differential calculation, and a speed PID control unit that compares the actual speed value with a preset speed value.
Further, the preset module further comprises a preset position value, the PID control module is configured to analyze and calculate the preset position value to obtain a speed value, compare the speed value with the preset speed value, and control the opening of the valve port of the proportional valve control module if the speed value is smaller than the preset speed value; and if the speed value is greater than the preset speed value, controlling the valve port of the proportional valve control module to be closed.
Further, the PID control module includes a PID calculation unit that analyzes and calculates the preset position value by integral calculation, and a speed PID control unit that compares the speed value with a preset speed value.
Specifically, when the injection molding machine does each action, the host computer will give signals such as pressure, flow to the proportional valve, and the proportional valve begins to work after receiving the instruction, and the proportional valve can feed back the current operating condition to the host computer often simultaneously, and the numerical value and the target value that the host computer feedbacks according to the proportional valve are compared, and optimize to form the closed-loop control of power and flow.
Further, the screw rod driving device further comprises a motor driving module for driving the screw rod to rotate.
Specifically, after an operator sets a preset speed value and a preset position value, a PID (proportion integration differentiation) calculation unit of the upper computer obtains a speed value through integral calculation according to the preset position value and sends the speed value to a speed PID control unit, the speed PID control unit of the upper computer compares the preset speed value with the speed value and then controls the opening and closing of a proportional valve to control the action of the oil cylinder;
when the oil cylinder starts to move, the position of the oil cylinder is fed back to the upper computer through the resistance ruler, the PID calculation unit of the upper computer performs differential calculation according to the feedback of the resistance ruler to obtain a current actual speed value, the current actual speed value is compared with a preset speed value, and if the actual speed value is slow, the proportional valve is controlled to open the valve port to be large, so that the speed of the oil cylinder is consistent with the preset speed value.
(III) advantageous effects
Compared with the prior art, the servo valve control mechanism and the system thereof of the injection molding machine are designed, a controller is omitted, the position of the oil cylinder is directly fed back to an upper computer, the upper computer is used for analyzing and calculating, and the calculation is quicker and more accurate; and the connection of the circuit is reduced, the whole wiring layout is simpler, the possibility of circuit interference is reduced, and the machine cost and the after-sale cost are greatly reduced.
Drawings
FIG. 1 is a schematic view of a servo valve control mechanism of an injection molding machine according to the present embodiment;
FIG. 2 is a schematic view of a servo valve control system of an injection molding machine according to the present embodiment;
fig. 3 is a schematic structural diagram of a servo valve control system of an injection molding machine according to the present embodiment.
Description of the reference numerals: 1. a screw; 2. a motor; 3. an oil cylinder; 4. a proportional valve; 5. an upper computer; 101. an oil cylinder driving module; 102. a proportional valve control module; 103. an upper computer control module; 1031. presetting a module; 1031a, a preset speed value; 1031b, preset position value; 1032. a PID control module; 1032a, a PID calculation unit; 1032b, a speed PID control unit; 104. and a position detection module.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
In this embodiment:
as shown in fig. 1, a servo valve control mechanism of an injection molding machine of the present embodiment includes a screw 1, a motor 2 for driving a rotational movement of the screw 1, and an oil cylinder 3 for driving an axial movement of the screw 1; the servo valve control mechanism is used for controlling the running speed of the oil cylinder 3 and comprises a proportional valve 4 which is connected with the oil cylinder 3 and used for adjusting the running speed of the oil cylinder 3 and an upper computer 5 which is connected with the proportional valve 4 and used for adjusting the size of a valve port of the proportional valve 4. Further, the servo valve control mechanism further comprises a resistance ruler for detecting the position of the oil cylinder 3, and the resistance ruler is electrically connected with the upper computer 5; the upper computer 5 comprises a control module for analyzing and calculating the feedback of the resistance ruler. In this embodiment, the control module is a PID control system. By adopting the scheme, the controller is cancelled, the connection of lines is reduced, the whole wiring layout is simpler, the possibility of circuit interference is reduced, and the machine cost and the after-sale cost are greatly reduced.
As shown in fig. 1 to 3, the servo valve control system of an injection molding machine of the present embodiment includes a cylinder driving module 101 for driving an axial movement of a screw 1; the proportional valve control module 102 is connected with the oil cylinder driving module 101 and is used for controlling the axial movement speed of the oil cylinder driving module 101; and the upper computer control module 103 is respectively connected with the proportional valve control module 102 and the oil cylinder driving module 101, and is used for analyzing and calculating according to the position value of the oil cylinder driving module 101 and sending a signal to the proportional valve control module 102. Further, the device further comprises a position detection module 104, which is respectively connected with the oil cylinder driving module 101 and the upper computer control module 103, and is used for detecting the position of the oil cylinder driving module 101 and sending a signal to the upper computer control module 103. Preferably, the position detecting module 104 is a resistance ruler. Further, the screw driver comprises a motor driving module for driving the screw 1 to rotate.
Further, the upper computer control module 103 includes a preset module 1031, and a PID control module 1032 connected to the preset module 1031; the preset module 1031 includes a preset speed value 1031a, the PID control module 1032 is respectively connected to the cylinder driving module 101 and the proportional valve control module 102, and is configured to analyze and calculate a position of the cylinder driving module 101 to obtain an actual speed value, compare the actual speed value with the preset speed value 1031a, and control a valve port of the proportional valve control module 102 to be opened if the actual speed value is smaller than the preset speed value 1031 a; if the actual speed value is greater than the preset speed value 1031a, the valve port of the proportional valve control module 102 is controlled to be turned off. Further, the PID control module 1032 includes a PID calculation unit 1032a for calculating the position of the cylinder driving module 101 by differential calculation, and a speed PID control unit 1032b for comparing the actual speed value with the preset speed value 1031a. Further, the preset module 1031 further includes a preset position value 1031b, the PID control module 1032 is configured to analyze and calculate the preset position value 1031b to obtain a speed value, compare the speed value with the preset speed value 1031a, and control the valve port of the proportional valve control module 102 to open if the speed value is smaller than the preset speed value 1031 a; and if the speed value is greater than the preset speed value 1031a, controlling the valve port of the proportional valve control module 102 to close. Further, the PID control module 1032 includes a PID calculation unit 1032a for analyzing and calculating the preset position value 1031b by integral calculation, and a speed PID control unit 1032b for comparing the speed value with the preset speed value 1031a. Specifically, when the injection molding machine does each action, the upper computer 5 can send signals such as pressure and flow to the proportional valve 4, the proportional valve 4 starts to work after receiving an instruction, meanwhile, the proportional valve 4 can feed the current working state back to the upper computer 5 from time to time, and the upper computer 5 compares the numerical value fed back by the proportional valve 4 with the target value and optimizes the numerical value to form closed-loop control of force and flow.
When the device is used, after an operator sets a preset speed value 1031a and a preset position value 1031b, the PID calculation unit 1032a of the upper computer 5 obtains a speed value through integral calculation according to the preset position value 1031b, and sends the speed value to the speed PID control unit 1032b, the speed PID control unit 1032b of the upper computer 5 compares the preset speed value 1031a with the speed value, and then controls the switch of the proportional valve 4 to control the action of the oil cylinder 3;
after the oil cylinder 3 starts to move, the position of the oil cylinder 3 is fed back to the upper computer 5 through the resistance ruler, the PID calculation unit 1032a of the upper computer 5 performs differential calculation according to the feedback of the resistance ruler to obtain a current actual speed value, and compares the current actual speed value with the preset speed value 1031a, if the actual speed value is slow, the proportional valve 4 is controlled to open the valve port to be large, so that the speed of the oil cylinder 3 is consistent with the preset speed value 1031a.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims (10)

1. A servo valve control mechanism of an injection molding machine, the injection molding machine comprising a screw (1), a motor (2) for driving the screw (1) to rotate, and an oil cylinder (3) for driving the screw (1) to move axially; the method is characterized in that: the servo valve control mechanism is used for controlling the running speed of the oil cylinder (3) and comprises a proportional valve (4) which is connected with the oil cylinder (3) and used for adjusting the running speed of the oil cylinder (3) and an upper computer (5) which is connected with the proportional valve (4) and used for adjusting the size of a valve port of the proportional valve (4).
2. The servo valve control mechanism of an injection molding machine according to claim 1, wherein: the servo valve control mechanism further comprises a resistance ruler used for detecting the position of the oil cylinder (3), and the resistance ruler is electrically connected with the upper computer (5); the upper computer (5) comprises a control module for analyzing and calculating the feedback of the resistance ruler.
3. The servo valve control mechanism of an injection molding machine according to claim 2, wherein: the control module includes a PID control system.
4. A servo valve control system of an injection molding machine to which the servo valve control mechanism of any one of claims 1 to 3 is applied, characterized in that: the servo valve control system comprises
The oil cylinder driving module (101) is used for driving the screw (1) to axially move;
the proportional valve control module (102) is connected with the oil cylinder driving module (101) and is used for controlling the speed of the axial movement of the oil cylinder driving module (101);
and the upper computer control module (103) is respectively connected with the proportional valve control module (102) and the oil cylinder driving module (101), and is used for analyzing and calculating according to the position value of the oil cylinder driving module (101) and sending a signal to the proportional valve control module (102).
5. The servovalve control system of an injection molding machine according to claim 4, wherein: the device is characterized by further comprising a position detection module (104) which is respectively connected with the oil cylinder driving module (101) and the upper computer control module (103) and used for detecting the position of the oil cylinder driving module (101) and sending a signal to the upper computer control module (103).
6. The servo valve control system of an injection molding machine according to claim 4 or 5, characterized in that: the upper computer control module (103) comprises a preset module (1031) and a PID control module (1032) connected with the preset module (1031); the preset module (1031) comprises a preset speed value (1031 a), the PID control module (1032) is respectively connected with the cylinder driving module (101) and the proportional valve control module (102) and is used for analyzing and calculating the position of the cylinder driving module (101) to obtain an actual speed value, comparing the actual speed value with the preset speed value (1031 a), and if the actual speed value is smaller than the preset speed value (1031 a), controlling the valve port of the proportional valve control module (102) to be opened; and if the actual speed value is greater than the preset speed value (1031 a), controlling the valve port of the proportional valve control module (102) to be closed.
7. A servovalve control system for an injection molding machine according to claim 6, wherein: the PID control module (1032) comprises a PID calculation unit (1032 a) which calculates the position of the oil cylinder driving module (101) by adopting differential calculation, and a speed PID control unit (1032 b) which is used for comparing an actual speed value with a preset speed value (1031 a).
8. The servovalve control system of an injection molding machine according to claim 6, wherein: the preset module (1031) further comprises a preset position value (1031 b), the PID control module (1032) is configured to analyze and calculate the preset position value (1031 b) to obtain a speed value, compare the speed value with the preset speed value (1031 a), and control the valve port of the proportional valve control module (102) to open if the speed value is smaller than the preset speed value (1031 a); and if the speed value is greater than the preset speed value (1031 a), controlling the valve port of the proportional valve control module (102) to be closed.
9. The servovalve control system of an injection molding machine according to claim 8, wherein: the PID control module (1032) includes a PID calculation unit (1032 a) that analyzes and calculates the preset position value (1031 b) using integral calculation, and a speed PID control unit (1032 b) that compares the speed value and the preset speed value (1031 a).
10. A servovalve control system for an injection molding machine according to claim 4, wherein: the screw rod driving device further comprises a motor driving module which is used for driving the screw rod (1) to rotate.
CN202211067018.4A 2022-09-01 2022-09-01 Servo valve control mechanism of injection molding machine and system thereof Pending CN115416244A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211067018.4A CN115416244A (en) 2022-09-01 2022-09-01 Servo valve control mechanism of injection molding machine and system thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211067018.4A CN115416244A (en) 2022-09-01 2022-09-01 Servo valve control mechanism of injection molding machine and system thereof

Publications (1)

Publication Number Publication Date
CN115416244A true CN115416244A (en) 2022-12-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211067018.4A Pending CN115416244A (en) 2022-09-01 2022-09-01 Servo valve control mechanism of injection molding machine and system thereof

Country Status (1)

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CN (1) CN115416244A (en)

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