Blow molding machine extrusion head lifting measurement method and control system

Abstract

The invention relates to the technical field of blow molding machine equipment, and discloses a blow molding machine extrusion head lifting measuring method and a control system, the blow molding machine extrusion head lifting measuring system comprises a blow molding machine extrusion head platform, a tilt angle sensor is horizontally installed on the blow molding machine extrusion head platform, a fulcrum and a lifting mechanism are hinged to the bottom of the blow molding machine extrusion head platform, and the lifting mechanism is located on the side face of the fulcrum. A parison head is installed on the side face of the blow molding machine extrusion head platform, a pipe blank is movably connected to the parison head, and the device further comprises a controller matched with the lifting mechanism. The device is convenient to mount and low in maintenance cost, the tilt angle sensor only needs to be parallel to the extrusion head platform of the blow molding machine and is fixed during mounting, a complex auxiliary mechanism is not needed, wiring is neat and convenient, and the maintenance cost is greatly reduced; the response speed and precision are high, the tilt angle sensor is high in response speed, full-closed-loop lifting motion control of the extrusion head platform of the blow molding machine can be perfectly achieved, and the problem of pipe blank deformation caused by motion inertia of the extrusion head platform of the blow molding machine is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of blow molding machine equipment and discloses a blow molding machine extrusion head lifting measurement method and a control system. Background Art

[0002] In the process of blow molding machine, there is a process that when the mold head extrude the tube embryo, the controller outputs a signal to let the proportional hydraulic control valve lift the extrusion platform (the mold head is on the extrusion platform) to a reasonable height as a whole to prevent the tube embryo from slowly flowing into the cutter closing plate. Before the next process, the proportional hydraulic control valve will lower the extrusion platform to its original position. During the movement of the extrusion platform lifting or lowering, the inertia is large, and the tube embryo in the molten state is prone to deformation, so it is necessary to control the speed of the movement path, and feedback the position signal to the controller in real time through the sensor to form a closed-loop control.

[0003] In the blow molding machines on the market, the speed regulation of the proportional hydraulic control valve is generally achieved by sensing multiple proximity switch signals to feedback multiple positions, but it is cumbersome, not simple enough, and the feedback has limitations. There are also electronic rulers that directly measure the lifting height and the proportional hydraulic control valve performs real-time speed regulation, but the procurement cost of the electronic ruler is high. Due to the limited mechanical space and narrow environment, it is difficult to install proximity switches or electronic rulers, and the wiring is complicated, which is not convenient for later inspection and maintenance. Summary of the invention

[0004] In view of the defects in the prior art, the present invention provides a blow molding machine extrusion head lifting measurement method and control system, which realizes full closed-loop speed regulation through real-time feedback of angle and speed, and solves the problems of high cost, complex installation, and insufficient control accuracy of traditional solutions.

[0005] In order to solve the above technical problems, the present invention proposes the following technical solutions:

[0006] A method and control system for measuring the lifting of an extruder head of a blow molding machine, comprising an extruder head platform for the blow molding machine, a tilt sensor being horizontally mounted on the extruder head platform for the blow molding machine, a fulcrum and a lifting mechanism being hinged at the bottom of the extruder head platform for the blow molding machine, the lifting mechanism being located on the side of the fulcrum, a mold embryo head being mounted on the side of the extruder head platform for the blow molding machine, a tube embryo being movably connected to the mold embryo head, and a controller being coordinated with the lifting mechanism.

[0007] Furthermore, the lifting mechanism comprises a proportional hydraulic regulating valve, a telescopic end of the proportional hydraulic regulating valve is hinged to the bottom of the extruder head platform of the blow molding machine, and the proportional hydraulic regulating valve is electrically connected to the controller.

[0008] Furthermore, the lifting mechanism includes a servo motor, a screw rod, and a lifting nut. The screw rod is installed at the output end of the servo motor through a coupling. The screw rod is externally connected to a fixed frame. The screw rod is rotatably set in the fixed frame. The lifting nut is threaded in the screw rod, and the lifting nut is connected to the base of the blow molding machine extruder head platform.

[0009] Furthermore, it also includes setting the lifting height H0 and speed V0 of the blow molding machine extruder head platform, starting the lifting mechanism to lift the blow molding machine extruder head platform, reading θ and V in real time, calculating the actual lifting height H of the lifting mechanism and the target deviation ΔH=H0-H, and the speed deviation ΔV=V0-V,

[0010] The controller fuses the height deviation and the speed deviation through the PID algorithm and outputs a lifting mechanism control signal. The output adjustment amount of the PID algorithm is: O=Kp·ΔH+Ki·∫ΔH+Kd·ΔV;

[0011] O refers to output, Kp is the proportional coefficient of the lifting mechanism, Ki is the integral coefficient of the lifting mechanism, and Kd is the differential coefficient of the lifting mechanism.

[0012] Furthermore, the controller is a PLC controller configured to calculate the lifting height H and the adjustment amount.

[0013] Furthermore, the measuring method comprises the following steps:

[0014] S1, detection, based on the inclination sensor, real-time detection of the inclination angle θ and angular velocity V of the blow molding machine extruder head platform;

[0015] S2, calculation, based on the fixed distance D between the fulcrum and the lifting mechanism, the lifting height H is calculated by the trigonometric function formula H=D·tanθ;

[0016] S3, taking the height H and the angular velocity V as feedback parameters, comparing them with the preset target values ​​and adjusting the output of the lifting mechanism.

[0017] Furthermore, the angular velocity V is obtained by integrating angular acceleration data of the tilt sensor.

[0018] It can be seen from the above technical solution that the beneficial effects of the present invention are:

[0019] 1. The present invention is easy to install and has low maintenance cost. When installing the inclination sensor, it only needs to be parallel to and fixed to the extruder head platform of the blow molding machine. No complicated auxiliary mechanism is required, the wiring is neat and convenient, and the maintenance cost is greatly reduced.

[0020] 2. The present invention has fast response speed and high precision. The inclination sensor has fast response speed and high precision. It can perfectly realize the full closed-loop motion control of the lifting platform of the extruder head of the blow molding machine, and effectively reduce the deformation problem of the tube embryo caused by the motion inertia of the extruder head platform of the blow molding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0022] Figure 1 is a first state diagram of the first embodiment of the present invention;

[0023] Figure 2 is a second state diagram of the first embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of a second embodiment of the present invention;

[0025] Figure 4 It is the overall flow chart of the present invention.

[0026] Reference numerals:

[0027] 1-blow molding machine extruder head platform, 2-tilt sensor, 3-fulcrum, 4-proportional hydraulic regulating valve, 5-mold head, 6-tube embryo, 7-servo motor, 8-screw rod, 9-lifting nut. DETAILED DESCRIPTION

[0028] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0029] Embodiment 1:

[0030] Reference Figure 1-4 A method and control system for measuring the lifting of an extruder head of a blow molding machine, comprising an extruder head platform 1 for a blow molding machine, on which an inclination sensor 2 is horizontally installed, a fulcrum 3 and a lifting mechanism are hinged at the bottom of the extruder head platform 1 for a blow molding machine, the lifting mechanism is located on the side of the fulcrum 3, a mold embryo head 5 is installed on the side of the extruder head platform 1 for a blow molding machine, a tube embryo 6 is movably connected to the mold embryo head 5, and a controller is also included, which is arranged in coordination with the lifting mechanism.

[0031] In this embodiment, the lifting mechanism includes a proportional hydraulic regulating valve 4, the telescopic end of the proportional hydraulic regulating valve 4 is hinged to the bottom of the blow molding machine extruder head platform 1, and the proportional hydraulic regulating valve 4 is electrically connected to the controller; specifically, through the controller, the proportional hydraulic regulating valve 4 can be controlled to start, thereby driving the blow molding machine extruder head platform 1 to move.

[0032] In this embodiment, the lifting height H0 and speed V0 of the blow molding machine extruder platform 1 are set, the lifting mechanism is started to lift the blow molding machine extruder platform 1, θ and V are read in real time, and the actual lifting height H of the lifting mechanism and the target deviation ΔH=H0-H, the speed deviation ΔV=V0-V are calculated.

[0033] The controller fuses the height deviation and the speed deviation through the PID algorithm and outputs a lifting mechanism control signal. The output adjustment amount of the PID algorithm is: O=Kp·ΔH+Ki·∫ΔH+Kd·ΔV;

[0034] O refers to output, Kp is the proportional coefficient of the lifting mechanism, Ki is the integral coefficient of the lifting mechanism, and Kd is the differential coefficient of the lifting mechanism.

[0035] In this embodiment, the controller is a PLC controller, which is configured to calculate the lifting height H and the adjustment amount.

[0036] Embodiment 2:

[0037] Reference Figure 1-4 A method and control system for measuring the lifting of an extruder head of a blow molding machine, comprising an extruder head platform 1 for a blow molding machine, on which an inclination sensor 2 is horizontally installed, a fulcrum 3 and a lifting mechanism are hinged at the bottom of the extruder head platform 1 for a blow molding machine, the lifting mechanism is located on the side of the fulcrum 3, a mold embryo head 5 is installed on the side of the extruder head platform 1 for a blow molding machine, a tube embryo 6 is movably connected to the mold embryo head 5, and a controller is also included, which is arranged in coordination with the lifting mechanism.

[0038] In this embodiment, the lifting mechanism includes a servo motor 7, a screw rod 8, and a lifting nut 9. The screw rod 8 is installed at the output end of the servo motor 7 through a coupling. The screw rod 8 is externally connected to a fixed frame. The screw rod 8 is rotatably set in the fixed frame. The lifting nut 9 is threadedly set in the screw rod 8. The lifting nut 9 is connected to the base of the blow molding machine extruder head platform 1; specifically, the servo motor 7 can be started to drive the screw rod 8 to rotate, thereby driving the lifting nut 9 to move, and driving the blow molding machine extruder head platform 1 to move.

[0039] In this embodiment, the lifting height H0 and speed V0 of the blow molding machine extruder platform 1 are set, the lifting mechanism is started to lift the blow molding machine extruder platform 1, θ and V are read in real time, and the actual lifting height H of the lifting mechanism and the target deviation ΔH=H0-H, the speed deviation ΔV=V0-V are calculated.

[0040] The controller fuses the height deviation and the speed deviation through the PID algorithm and outputs a lifting mechanism control signal. The output adjustment amount of the PID algorithm is: O=Kp·ΔH+Ki·∫ΔH+Kd·ΔV;

[0041] O refers to output, Kp is the proportional coefficient of the lifting mechanism, Ki is the integral coefficient of the lifting mechanism, and Kd is the differential coefficient of the lifting mechanism.

[0042] In this embodiment, the controller is a PLC controller, which is configured to calculate the lifting height H and the adjustment amount.

[0043] Embodiment three:

[0044] Reference Figure 1-4 , the measurement method comprises the following steps:

[0045] S1, detection, based on the inclination sensor 2, real-time detection of the inclination angle θ and angular velocity V of the blow molding machine extruder head platform 1;

[0046] S2, calculation, based on the fixed distance D between the fulcrum 3 and the lifting mechanism, the lifting height H is calculated by the trigonometric function formula H=D·tanθ;

[0047] S3, taking the height H and the angular velocity V as feedback parameters, comparing them with the preset target values ​​and adjusting the output of the lifting mechanism.

[0048] In this embodiment, the angular velocity V is obtained by integrating the angular acceleration data of the tilt sensor.

[0049] Working principle:

[0050] The controller issues a start command to lift the blow molding machine extruder head platform 1, and the lifting mechanism starts to move;

[0051] The inclination sensor provides real-time feedback of the actual speed V and actual lifting angle θ of the blow molding machine extruder head platform 1;

[0052] The controller calculates the actual height H based on the trigonometric function H=D*tanθ;

[0053] The controller calculates the deviation ΔH between the target height and the actual height and the deviation ΔV between the target speed and the actual speed according to the PID algorithm;

[0054] The controller calculates the corresponding output according to the deviation, and the lifting mechanism adjusts its action according to the change of output to achieve full closed-loop speed control.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A blow molding machine extrusion head lifting control system, comprising a blow molding machine extrusion head platform (1), characterized in that: The blow molding machine extruder head platform (1) is horizontally mounted with an inclination sensor (2); the bottom of the blow molding machine extruder head platform (1) is hinged with a fulcrum (3) and a lifting mechanism, the lifting mechanism is located on the side of the fulcrum (3); a mold blank head (5) is mounted on the side of the blow molding machine extruder head platform (1); a tube blank (6) is movably connected to the mold blank head (5); and a controller is also included, which is arranged in coordination with the lifting mechanism.

2. The blow molding machine extrusion head lifting control system according to claim 1, characterized in that: The lifting mechanism comprises a proportional hydraulic regulating valve (4), the telescopic end of the proportional hydraulic regulating valve (4) is hinged to the bottom of the blow molding machine extruder head platform (1), and the proportional hydraulic regulating valve (4) is electrically connected to the controller.

3. The blow molding machine extrusion head lifting control system according to claim 1, characterized in that: The lifting mechanism comprises a servo motor (7), a screw rod (8), and a lifting nut (9); the screw rod (8) is mounted on the output end of the servo motor (7) via a coupling; the screw rod (8) is externally connected to a fixing frame; the screw rod (8) is rotatably arranged in the fixing frame; the lifting nut (9) is threadably arranged in the screw rod (8); and the lifting nut (9) is connected to the base of the blow molding machine extruder head platform (1).

4. The blow molding machine extrusion head lifting control system according to claim 1, characterized in that: The method also includes setting the lifting height H0 and speed V0 of the blow molding machine extruder head platform (1), starting the lifting mechanism to lift the blow molding machine extruder head platform (1), reading θ and V in real time, calculating the actual lifting height H of the lifting mechanism and the target deviation ΔH=H0-H, and the speed deviation ΔV=V0-V, The controller fuses the height deviation and the speed deviation through the PID algorithm and outputs a lifting mechanism control signal. The output adjustment amount of the PID algorithm is: O=Kp·ΔH+Ki·∫ΔH+Kd·ΔV; O refers to output, Kp is the proportional coefficient of the lifting mechanism, Ki is the integral coefficient of the lifting mechanism, and Kd is the differential coefficient of the lifting mechanism.

5. The blow molding machine extrusion head lifting control system according to claim 1, characterized in that: The controller is a PLC controller configured to calculate the lifting height H and the adjustment amount.

6. A method for measuring the lifting of an extrusion head of a blow molding machine, comprising the lifting control system of the extrusion head of a blow molding machine according to any one of claims 1 to 5, characterized in that: The measuring method comprises the following steps: S1, detection, based on the inclination sensor (2), real-time detection of the inclination angle θ and angular velocity V of the blow molding machine extruder head platform (1); S2, calculation, based on the fixed distance D between the fulcrum (3) and the lifting mechanism, the lifting height H is calculated by the trigonometric function formula H = D·tanθ; S3, taking the height H and the angular velocity V as feedback parameters, comparing them with the preset target values ​​and adjusting the output of the lifting mechanism.

7. The method for measuring the lifting of the extrusion head of a blow molding machine according to claim 6, characterized in that: The angular velocity V is obtained by integrating the angular acceleration data of the tilt sensor.

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