A method, device and computer program product for controlling the material deflection brake force of a molding machine

Abstract

The present invention relates to the field of tire manufacturing technology, and more particularly to a method, device and computer program product for controlling the braking force of material guide-off of a molding machine. The present invention can determine whether a material roll is an empty roll by obtaining the inner diameter of a full roll of a pad cloth roll in advance, and can determine whether there is material without installing a material detection sensor. Based on algorithm-level control logic, it is possible to determine the diameter of the material roll and whether it is an empty roll without installing a material direct detection sensor and a material presence sensor, thereby controlling the braking force of the material guide-off roll and stopping when there is no material.

Description

Technical Field

[0001] The present invention relates to the technical field of tire manufacturing, and in particular to a method, device and computer program product for controlling the material diversion braking force of a molding machine. Background Art

[0002] The material guide of the existing tire building machine (for example, the feeding trolley disclosed in the Chinese patent CN215553260U applied by the applicant) needs to apply a braking force when guiding the material roll to keep the tension of the guiding pad roll and the material roll within a certain range. As the material is used, the material roll will have less and less material, and the pad roll will have more and more material. It is necessary to measure the diameter of the material roll in real time to determine the amount of material used and continuously reduce the braking force of the material roll.

[0003] The cloth roll of the guide device is controlled by the inverter to start and stop the rotation of the motor. The material roll is controlled by the air pressure output by the proportional pneumatic valve to control the brake chuck to apply braking force to the material roll. The diameter of the material roll is measured by the laser distance sensor, so as to judge the remaining amount of the material and give the air pressure ratio to apply braking force.

[0004] There is no problem in the existing control principle, but the guide device of the old equipment and the guide device of the new equipment need to be equipped with a laser diameter sensor to measure the diameter of the material roll for braking force control. The purchase price of the laser sensor ranges from several thousand yuan to tens of thousands of yuan. It also requires a special analog input module of the PLC to complete data collection, which is costly. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a method for controlling the braking force of material diverting of a forming machine. This method can directly detect sensors and the presence or absence of sensors for the material without installing the material, determine the diameter of the material roll and whether the roll is empty, thereby controlling the braking force of the material diverting roll and stopping when there is no material.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A method for controlling the braking force of materials in a molding machine, the method comprising the following steps:

[0008] 1) Obtain the fixed length L of the material from the forming machine. L is the length of each time the pad roll and material roll are taken up and unwound;

[0009] 2) Collect the start and end signals of each fixed length of the molding machine from the molding equipment;

[0010] 3) Obtain the running time of each fixed-length stage from the inverter time of the padding release device, set the parameter to T1, and obtain the output frequency of the inverter action, set the parameter to f0;

[0011] 4) The action time of the material roll is equal to that of the pad roll. The action time parameter of the material roll is set to T2, T1=T2;

[0012] 5) The speed formula of three-phase asynchronous motor is: n=60f / p(1-s), f represents the power frequency, f=f0, P is the number of pole pairs, n represents the speed, s represents the slip rate; we can get n=60*f0 / p(1-s);

[0013] 6) Calculate the number of turns of the pad roll motor in a fixed-length cycle as Q, Q=n*T=60*f0 / p(1-s)*T2, and the diameter of the pad roll is D=L*Q / π;

[0014] 7) The diameter of the material roll is inversely calculated through the diameter of the pad roll; thereby controlling the output pneumatic proportional valve to control the proportional air pressure to achieve the purpose of controlling the material roll brake.

[0015] Preferably, when the diameter of the material roll is full, a brake pressure of 1 bar is output; when the diameter is 0.4-0.5 rolls, the proportional valve outputs a brake pressure of 3 bar, and the output is proportional in the middle.

[0016] Furthermore, the present invention also discloses a material diverting device for a forming machine, which includes a passive material roll and an active cloth roll, the cloth roll is driven by the cloth diverting device, the cloth diverting device has a frequency converter, and the material roll is provided with a brake device, and the brake device uses the described method to control the brake pressure.

[0017] Furthermore, the present invention also discloses a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the method.

[0018] Furthermore, the present invention also discloses a computer-readable storage medium on which a computer program or instruction is stored. When the computer program or instruction is executed by a processor, the method is implemented.

[0019] Furthermore, the present invention also discloses a computer program product, including a computer program or instructions, which implement the method when executed by a processor.

[0020] Since the present invention adopts the above-mentioned technical solution, the method can achieve the same control effect as the original method of adding a material roll diameter distance measuring sensor, but does not need to install a laser distance measuring sensor. At the same time, the inner diameter of the full roll of the pad cloth roll is obtained in advance, and it can be determined whether the material roll is an empty roll, and it is also possible to determine whether there is material without installing a material detection sensor. Based on the above algorithm-level control logic, it is possible to determine the diameter of the material roll and whether it is an empty roll without installing a material direct detection sensor and a material presence sensor, thereby controlling the braking force of the material guide roll and the material stop. DETAILED DESCRIPTION

[0021] According to the characteristics of the forming machine, the fixed length of each specification of the material is fixed and can be read from the PLC formula. The parameter is set to L. This length is also the length of each time the pad roll and material roll are rolled up and unwound.

[0022] The start and end signals of each fixed-length molding machine are collected by the PLC from the molding equipment.

[0023] The time that the padding release device runs in the fixed length stage can be collected from the inverter time, and this parameter is set to T1. The output frequency of the inverter action can also be collected from the inverter by the PLC, and this parameter is set to f0.

[0024] Since the material roll is passively pulled by the pad roll, the action time of the material roll is equal to the action time of the pad roll. Assuming that the action time of the material roll is T2, it can be obtained that T1=T2.

[0025] The speed formula of a three-phase asynchronous motor is: n=60f / p(1-s) f represents the power frequency (which can be read by the inverter and can be understood as f=f0) P represents the number of pole pairs (a known quantity of the motor) n represents the speed and s represents the slip rate (a known quantity of the motor)

[0026] So we can get n=60*f0 / p(1-s)

[0027] Assume that the number of turns of the pad roll motor in a fixed-length cycle is Q

[0028] Q=n*T=60*f0 / p(1-s)*T2

[0029] The diameter of the cloth roll is D=L*Q / π

[0030] Since the guide device is in the same state when the pad roll is empty and when the material roll is full, and the pad roll is in the same state when it is full and when the material roll is empty, the approximate diameter of the pad roll can be inversely proportional to the material roll diameter. Thus, the output pneumatic proportional valve is controlled to control the proportional air pressure, achieving the purpose of controlling the material roll brake.

[0031] As a specific example, when the diameter of the material roll of the present invention is full (diameter 0.55m), the proportional valve outputs a pressure of about 1 bar. When the diameter is 0.25m, the proportional valve outputs a pressure of about 3 bar, and the proportional pressure in between is outputted in proportion.

[0032] The above is a description of the embodiments of the present invention. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the present invention. Various modifications to these embodiments will be apparent to professionals and technicians in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will conform to the widest range consistent with the principles and novelties disclosed herein.

Claims

1. A method for controlling the braking force of material diversion in a molding machine, characterized in that: The method comprises the following steps: 1) Obtain the fixed length L of the material from the forming machine. L is the length of each time the pad roll and material roll are taken up and unwound; 2) Collect the start and end signals of each fixed length of the molding machine from the molding equipment; 3) Obtain the running time of each fixed-length stage from the inverter time of the padding release device, set the parameter to T1, and obtain the output frequency of the inverter action, set the parameter to f0; 4) The action time of the material roll is equal to that of the pad roll. The action time parameter of the material roll is set to T2, T1=T2; 5) The speed formula of three-phase asynchronous motor is: n=60f / p(1-s), f represents the power frequency, f=f0, P is the number of pole pairs, n represents the speed, s represents the slip rate; we can get n=60*f0 / p(1-s); 6) Calculate the number of turns of the pad roll motor in a fixed-length cycle as Q, Q=n*T=60*f0 / p(1-s)*T2, and the diameter of the pad roll is D=L*Q / π; 7) The diameter of the material roll is inversely calculated through the diameter of the pad roll; thereby controlling the output pneumatic proportional valve to control the proportional air pressure to achieve the purpose of controlling the material roll brake.

2. A method for controlling the material diversion braking force of a molding machine according to claim 1, characterized in that: When the diameter of the material roll is full, the brake pressure of 1 bar is output; when the diameter is 0.4-0.5 rolls, the proportional valve outputs 3 bar brake pressure, and the output is proportional in the middle.

3. A material diverting device for a molding machine, characterized in that: The device comprises a passive material roll and an active pad cloth roll, wherein the pad cloth roll is driven by a pad cloth deflecting device having a frequency converter, and the material roll is provided with a brake device, wherein the brake device controls the brake pressure by the method described in claim 1 or 2.

4. A computer device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the method according to any one of claims 1 to 2.

5. A computer-readable storage medium having a computer program or instruction stored thereon, characterized in that: When the computer program or instruction is executed by a processor, the method described in any one of claims 1 to 2 is implemented.

6. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed by a processor, the method described in any one of claims 1 to 2 is implemented.