Heat shrink tube expansion PLC control system and control method thereof

Abstract

The invention provides a heat shrink tube expansion PLC (Programmable Logic Controller) control system and a control method thereof, and the method comprises the following steps: during pay-off before expansion, a PLC controls a heat shrink tube to extend to a preset length from a heat shrink tube coil; the tension sensor detects the tension of the heat shrink tube in the pay-off process; in the heating process, the PLC obtains the heating temperature according to the first infrared temperature sensor; the PLC controls the first output temperature of the heat shrink tube at the outlet of the expansion mechanism to be a preset expansion temperature; in the vacuum expansion process, the PLC controls the expansion mechanism to rapidly expand the heated heat shrink tube, and the shape of the expanded heat shrink tube is fixed; in the cooling process, the PLC controls the heat shrink tube passing through the first cooling chamber to be primarily cooled and the heat shrink tube passing through the second cooling chamber to be continuously cooled, and then the second output temperature is obtained. Precise control over the whole expansion process of the heat shrink tube is achieved, so that normal work of the system is guaranteed, the production efficiency of the system is improved, the product quality is improved, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of tube expansion, and in particular to a heat shrink tube expansion PLC control system and a control method thereof. Background Art

[0002] The outer layer of the heat shrink tube is made of high-quality soft cross-linked polyolefin material and the inner layer of hot melt adhesive. It has the characteristics of insulation, corrosion resistance, and wear resistance. The material is in a glassy state at room temperature and becomes highly elastic after heating. Before expansion, the heat shrink tube is heated to a highly elastic state and pressure is applied to expand it. Then, while maintaining the expansion, the heat shrink tube is quickly cooled to enter a glassy state, and this state can be maintained.

[0003] At present, there is a lack of a complete device for the expansion of heat shrinkable tubes, which makes it impossible to control the expansion process of heat shrinkable tubes, making it difficult to ensure the production efficiency of the tubes, thus affecting the quality of the tubes.

[0004] Therefore, a new solution for PLC control of heat shrink tubing expansion is needed. Summary of the invention

[0005] In view of this, the embodiments of this specification provide a heat shrink tube expansion PLC control system and a control method thereof.

[0006] The embodiments of this specification provide the following technical solutions:

[0007] The embodiment of this specification provides a PLC control system for heat shrinkable tube expansion, including a wire release mechanism, a heating mechanism, an expansion mechanism, a tension measurement mechanism, a diameter measurement mechanism and a PLC controller;

[0008] A wire-releasing mechanism, a heating mechanism, an expansion mechanism, a tension measuring mechanism and a diameter measuring mechanism are arranged along the length direction of the heat shrinkable tube;

[0009] The wire-releasing mechanism comprises a heat-shrinkable tube reel;

[0010] The heating mechanism includes a first infrared temperature sensor; the first infrared temperature sensor is arranged between the heating mechanism and the expansion mechanism, and is used to collect the heating temperature of the heat shrink tube at the outlet of the heating mechanism;

[0011] The expansion mechanism includes a second infrared temperature sensor, which is arranged between the expansion mechanism and the tension measuring mechanism and is used to collect the output temperature of the heat shrink tube at the outlet of the expansion mechanism;

[0012] The tension measuring mechanism includes a tension sensor, which is arranged at the outlet of the expansion mechanism and is used to collect the tension of the heat shrink tube; the diameter measuring mechanism includes an infrared diameter measuring instrument, which is installed below the tension measuring mechanism and is used to collect the expansion diameter of the heat shrink tube;

[0013] The first infrared temperature sensor, the second infrared temperature sensor, the tension sensor and the infrared diameter gauge are respectively connected to the PLC controller;

[0014] Among them, during the wire release process before expansion, the PLC controller controls the heat shrink tube to extend from the heat shrink tube reel to a preset length; the tension sensor is used to detect the tension of the heat shrink tube during the wire release process to ensure that the heat shrink tube will not relax or over-stretch during the wire release process;

[0015] During the heating process, the PLC controller obtains the heating temperature according to the first infrared temperature sensor to transform the heat shrink tube from a glass state to a highly elastic state;

[0016] The PLC controller controls the first output temperature of the heat shrink tube at the outlet of the expansion mechanism to be a preset expansion temperature;

[0017] During the vacuum expansion process, the PLC controller controls the expansion mechanism to rapidly expand the heated heat shrink tube and fix the shape of the expanded heat shrink tube;

[0018] During the cooling process, the PLC controller controls the initial cooling of the heat shrink tube passing through the first cooling chamber in the expansion mechanism, and obtains a second output temperature after further cooling through the second cooling chamber in the expansion mechanism to fix the shape of the heat shrink tube; wherein cooling water or other cooling media are arranged in the first cooling chamber and the second cooling chamber to cool the heat shrink tube to ensure that the heat shrink tube meets the expansion requirements.

[0019] The embodiment of this specification also provides a heat shrink tube expansion PLC control method, which uses the heat shrink tube expansion PLC control system described in the above technical solution, including:

[0020] During the wire release process before expansion, the PLC controller controls the heat shrink tube to extend from the heat shrink tube reel to a preset length; the tension sensor is used to detect the tension of the heat shrink tube during the wire release process to ensure that the heat shrink tube will not relax or over-stretch during the wire release process;

[0021] During the heating process, the PLC controller obtains the heating temperature according to the first infrared temperature sensor to transform the heat shrink tube from a glass state to a highly elastic state;

[0022] The PLC controller controls the first output temperature of the heat shrink tube at the outlet of the expansion mechanism to be a preset expansion temperature;

[0023] During the vacuum expansion process, the PLC controller controls the expansion mechanism to rapidly expand the heated heat shrink tube and fix the shape of the expanded heat shrink tube;

[0024] During the cooling process, the PLC controller controls the initial cooling of the heat shrink tube passing through the first cooling chamber in the expansion mechanism, and obtains a second output temperature after further cooling through the second cooling chamber in the expansion mechanism to fix the shape of the heat shrink tube; wherein cooling water or other cooling media are arranged in the first cooling chamber and the second cooling chamber to cool the heat shrink tube to ensure that the heat shrink tube meets the expansion requirements.

[0025] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above technical solutions adopted in the embodiments of this specification include at least:

[0026] In the embodiments of this specification, corresponding data acquisition and execution modules are set in each stage of the expansion of the heat shrinkable tube. Through the connected PLC controller, the entire process of the heat shrinkable tube expansion can be accurately controlled, thereby ensuring the normal operation of the system, improving the system production efficiency, improving product quality, and reducing production costs. At the same time, by using individual acquisition sensors and human-computer interaction interfaces, the parameters of the control process are accurately detected and controlled to ensure normal production and improve product quality and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of an overall PLC control system for heat shrinkable tube expansion according to an embodiment of the present application;

[0029] Figure 2 is a system diagram of a heat shrink tube expansion PLC control system according to an embodiment of the present application;

[0030] Figure 3 It is an overall framework flow chart of the heat shrink tube expansion PLC control system of the embodiment of the present application;

[0031] Figure 4 It is a logic control process diagram of the wire-laying process provided by an embodiment of the present application;

[0032] Figure 5 It is a logic control process diagram of the heating process provided by the embodiment of the present application;

[0033] Figure 6 It is a logic control process diagram of the cooling process provided in the embodiment of the present application.

[0034] Among them, 1. wire-releasing mechanism; 2. heat shrink tube; 3. traction mechanism; 4. heating mechanism; 5. expansion mechanism; 6. tension measuring mechanism; 7. diameter measuring mechanism; 8. PLC controller. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0036] The following describes the implementation of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The present application can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the art without making creative work belong to the scope of protection of the present application.

[0037] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0038] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0039] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0040] At present, there is a lack of a complete device for the expansion of heat shrinkable tubes, which makes it impossible to control the expansion process of heat shrinkable tubes, making it difficult to ensure the production efficiency of the tubes, thus affecting the quality of the tubes.

[0041] In view of this, the inventors found that the whole process of heat shrink tube expansion includes different implementation stages, such as wire laying, heating, vacuum expansion and cooling process before tube expansion.

[0042] Based on this, the embodiment of this specification proposes a new solution for PLC control of heat shrink tube expansion. Corresponding collection and execution modules are set for each stage of heat shrink tube expansion, and connected to the set PLC controller to achieve precise control of the entire process of heat shrink tube expansion, thereby ensuring the normal operation of the system, improving system production efficiency, improving product quality, and reducing production costs.

[0043] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0044] like Figure 1 and Figure 2 As shown, a PLC control system for heat shrinkable tube expansion provided by an embodiment of this specification includes a wire-releasing mechanism 1, a traction mechanism 3, a heating mechanism 4, an expansion mechanism 5, a tension measuring mechanism 6, a diameter measuring mechanism 7 and a PLC controller 8. The wire-releasing mechanism includes a heat shrinkable tube reel; the traction mechanism includes a servo motor and a traction wheel; the heating mechanism includes an infrared heating device and a first infrared temperature sensor; the first infrared temperature sensor is installed between the heating mechanism and the expansion mechanism; the expansion mechanism includes two vacuum expansion chambers, two cooling chambers and a second infrared temperature sensor; the second infrared temperature sensor is installed between the expansion mechanism and the tension measuring mechanism; the vacuum chamber includes a vacuum hole and a vacuum pump; the cooling chamber includes a water inlet and outlet hole and a motor; the tension measuring mechanism includes a tension sensor installed at the outlet of the expansion mechanism; the diameter measuring mechanism includes an infrared diameter gauge installed below the tension measuring mechanism.

[0045] The expansion mechanism includes a vacuum chamber and a cooling chamber. Two vacuum chambers and two cooling chambers are provided, and the vacuum chamber is in front of the cooling chamber. Vacuum chamber 1 rapidly expands the heated heat shrink tube, and vacuum chamber 2 fixes the shape of the expanded heat shrink tube; cooling chamber 1 preliminarily cools the expanded heat shrink tube, and cooling chamber 2 further cools the heat shrink tube to fix the shape. The heating mechanism heats the heat shrink tube at three temperature stages, so that the temperature of the heat shrink tube at the outlet of the heating mechanism meets the expansion requirements.

[0046] Wherein, adapters and expansion modules are installed at both ends of the PLC main controller, and the input and output of analog signals are realized through software programming.

[0047] Wherein, the execution device includes a motor (such as a first motor), an infrared heating device, a vacuum pump and a water pump.

[0048] Wherein, the data acquisition device includes an infrared temperature sensor, a liquid temperature sensor, a liquid flow sensor, a tension sensor and a caliper.

[0049] Among them, the first infrared temperature sensor detects the temperature at the outlet of the heating mechanism and the expansion mechanism, the liquid flow sensor detects the water flow velocity in the expansion mechanism, and the tension sensor and the caliper gauge detect the surface tension and diameter of the pipe at the outlet of the expansion mechanism.

[0050] The touch screen can display the status of the control system in real time and directly issue action instructions to the control system.

[0051] Furthermore, the touch screen displays the status information of the control system, including the number of infrared heating devices turned on during heating, the power of the infrared heating device, the temperature of the heat shrink tube after heating and cooling, the surface tension of the tube at the outlet of the expansion mechanism, and the diameter of the tube after expansion. The action instructions include the pulling speed of the heat shrink tube, the pay-off speed, the number and power of the infrared heating device turned on, the vacuum degree in the vacuum chamber, and the cooling water flow rate in the cooling chamber.

[0052] Among them, the number of infrared heatings that are turned on is determined by the diameter of the pipe; the power of the infrared heating device is obtained by the temperature of the pipe at the outlet of the heating mechanism and the PLC controller. If the temperature of the pipe at the outlet of the heating device is lower than the required temperature, the power of the heating device is increased by the PLC controller; the cooling water flow rate is obtained according to the temperature of the pipe at the outlet of the expansion mechanism and the PLC controller. If the temperature of the pipe at the outlet of the cooling device is higher than the set temperature, the cooling water flow rate is increased by the PLC controller.

[0053] By adopting the above technical solution, the adapter and the expansion module convert the obtained analog signal into a digital signal, and transmit the digital signal to the PLC main controller, so that after the PLC controller receives the digital signal, it calculates the output signal through internal logic, and then converts the output digital signal into an analog quantity through the expansion module, thereby controlling the working state of the execution device.

[0054] The adapter contains special auxiliary relays and special data registers, which are used to store analog quantities before and after PLC operation.

[0055] In combination with the above embodiments, the embodiments of this specification implement the protection line and traction process of the heat shrink tube through a traction mechanism.

[0056] like Figure 1 As shown, a traction mechanism 3 is provided, and the traction mechanism 3 is provided between the wire-releasing mechanism 1 and the heating mechanism 4, or provided after the diameter measuring mechanism 7;

[0057] The traction mechanism comprises a servo motor and a traction wheel;

[0058] The analog output module in the PLC controller is connected to the servo motor and is used to control the rotation speed of the servo motor according to the calculation result in the analog output module to control the speed and tension of the traction wheel extending the heat shrink tube.

[0059] The traction mechanism evenly pulls the heat shrink tubing from the wire drum of the wire guard mechanism and starts the entire expansion process. The tension of the heat shrink tubing can be precisely controlled by the servo motor and traction wheel. The uniformity of tension is critical to ensure the quality and consistency of the heat shrink tubing during the heating and expansion process. The traction mechanism can also control the pay-off speed of the heat shrink tubing to ensure synchronization with subsequent steps such as heating, expansion and cooling to achieve coordinated operation of the entire production line. In some cases, the traction mechanism is also responsible for accurately positioning the heat shrink tubing to specific locations in each link of heating, expansion and cooling. After the heat shrink tubing is expanded, the traction mechanism may also be responsible for pulling the finished heat shrink tubing to the reel mechanism for winding and packaging.

[0060] In some embodiments, the vacuum chamber in the expansion mechanism is arranged in front of the cooling chamber along the flow direction of the cooling medium; the expansion mechanism includes a first vacuum chamber and a second vacuum chamber, the first vacuum chamber is used to quickly expand the heat shrink tube after heating, and the second vacuum chamber is used to fix the shape of the heat shrink tube after expansion; each vacuum chamber in the expansion mechanism is connected to a vacuum pump through a vacuum hole; the vacuum pump is used to extract air in the vacuum chamber through the vacuum hole to form a negative pressure environment so that the heat shrink tube can expand in the negative pressure environment; the analog output module of the PLC controller is connected to the vacuum pump to control the extraction speed of the vacuum pump to form a negative pressure environment; Each cooling chamber is provided with a cooling medium inlet and outlet hole and a first motor; the analog output module of the PLC controller is connected to the first motor so as to control the first motor to adjust the flow rate of the cooling medium; a liquid flow sensor is also provided in the cooling chamber; the liquid flow sensor is connected to the analog input module of the PLC controller and is used to detect the flow rate of the cooling medium so as to control the running speed of the first motor to adjust the flow rate of the cooling medium; a liquid temperature sensor is also provided in the cooling chamber, and the liquid temperature sensor is connected to the analog input module of the PLC controller and is used to detect the temperature of the cooling medium to ensure the cooling of the heat shrink tube.

[0061] Specifically, the expansion mechanism includes two vacuum chambers, and the first vacuum chamber is responsible for the initial expansion of the heated heat shrink tube. At this stage, the heat shrink tube is heated to a highly elastic state, and through the negative pressure environment in the first vacuum chamber, the heat shrink tube begins to expand to adapt to the shape of the mold or reach the required diameter.

[0062] The second vacuum chamber is used to fix the shape of the heat shrink tubing after it has been expanded in the first vacuum chamber. At this stage, the heat shrink tubing continues to be maintained in an expanded state by the negative pressure environment, which helps to fix its expanded shape and ensure that the heat shrink tubing maintains the desired shape and size before cooling.

[0063] The two vacuum chambers correspond to two cooling chambers, which are used to quickly cool the expanded heat shrink tubing. This rapid cooling helps the heat shrink tubing to be quickly fixed in the expanded state, prevents the material from rebounding, and ensures the quality of the final product.

[0064] The first cooling chamber preliminarily cools the expanded heat shrinkable tube, and the second cooling chamber further cools the heat shrinkable tube.

[0065] In some embodiments, the heating mechanism includes an infrared heating device for heating the heat shrink tube; multiple infrared heating devices are arranged in the heating mechanism; the analog output module in the PLC controller is connected to the heating mechanism so as to control the heating power of the heating mechanism and the number of infrared heating devices turned on for heating.

[0066] Combined with Figure 2 The invention is described as follows, including a host computer, a PLC controller, an execution device (such as a vacuum pump, a water pump, an infrared heating device, a first motor) and a data acquisition device (such as a liquid temperature sensor, a liquid flow sensor, a first infrared temperature sensor, a second infrared temperature sensor, a side diameter gauge, and a tension measuring instrument). In some embodiments, the PLC controller includes a control module, an analog input module, and an analog output module; the analog input and output modules are respectively installed at both ends of the PLC main controller; the PLC controller obtains various parameters of the heat shrink tube and transmits the various parameters to the analog input module;

[0067] The analog input module is used to receive the various parameters and transmit them to the control module for processing to obtain calculation results;

[0068] The control module is used to transmit the operation result to the analog output module to execute control on the heat shrink tube.

[0069] It also includes a host computer connected to a PLC controller, the host computer includes a touch screen; the touch screen is connected to a PLC main controller; the data acquisition device is connected to an analog input module; the execution device is connected to an analog output module. The first motor is a motor for controlling the flow of cooling medium.

[0070] Wherein, the data acquisition device includes an infrared temperature sensor, a liquid temperature sensor, a liquid flow sensor, a tension sensor and a diameter gauge; the execution device includes a first motor, an infrared heating device, a vacuum pump and a water pump.

[0071] Wherein, adapters and expansion modules are installed at both ends of the PLC controller, and the input and output of analog signals are realized through software programming.

[0072] Among them, the process of inputting and outputting the analog signal requires the use of adapters and expansion modules at both ends of the PLC main controller. Specifically, analog signals are divided into voltage-type analog signals and current-type analog signals. In this system, the adapter and expansion module are combined to expand the interface of the PLC controller. When the PLC reads analog data, the special auxiliary relay is used to distinguish the type of analog signal; the PLC main controller converts the analog signal into a digital signal according to the conversion relationship inside the expansion module. Among them, the adapter will fixedly place the converted value in the corresponding special data register, and the expansion module will fixedly store the converted value in the corresponding special buffer memory; after the above-mentioned values ​​are subjected to the logical operation inside the PLC, the digital signal is converted into an analog signal according to the conversion relationship inside the expansion module, and then the execution device is controlled.

[0073] Figure 3 It is the overall flow chart of the control system. The material type and diameter of the heat shrink tube are input on the touch screen, and the pulling speed is set; the heat shrink tube is paid out under the action of the pulling mechanism; the corresponding paying out speed and the size of the surface tension of the tube at the outlet of the expansion mechanism are displayed on the touch screen; the PLC controls the operating state of the infrared heating device according to the diameter of the tube and the temperature of the tube at the outlet of the heating device; then the heated tube is vacuum expanded and the flow rate of the cooling water is controlled according to the temperature of the tube at the outlet of the expansion mechanism; and it is determined whether to continue to increase the pulling speed of the tube according to the size of the tube diameter detected in real time by the diameter gauge.

[0074] Among them, the above-mentioned pipe diameter, surface tension and temperature of the pipe after cooling can be detected in real time by installing a diameter gauge, a tension sensor and an infrared temperature sensor at the outlet of the expansion mechanism; the pulling speed and the wire-releasing speed are obtained by calculating the rotation speed of the servo motor; the temperature value of the pipe after heating is detected in real time by the infrared temperature sensor at the outlet of the heating mechanism; the water flow rate is detected in real time by using a liquid flow sensor.

[0075] Furthermore, the overall control process of the heat shrink tube expansion is divided into four steps: pay-off, heating, expansion and cooling.

[0076] like Figure 4The figure shows the logic control process of the heat shrink tube unwinding. The value range of the unwinding speed is set on the touch screen, and the value is transmitted to the PLC main control using the analog input module. The real-time detected value is compared with the set range value. If the actual value is less than the set value, the value of the analog output module of the PLC controller is used to control the output frequency value of the inverter, increase the motor speed and thus increase the unwinding speed; if the actual value is greater than the set value, reduce the motor speed and thus reduce the unwinding speed until the detected value is within the set value range.

[0077] like Figure 5 As shown in the figure, it is the logic control process of infrared heating of heat shrink tube. The preset values ​​of the diameter, material type and temperature of the tube are input on the touch screen, and the values ​​are transmitted to the PLC main controller by using the analog input module. The PLC controller controls the number of infrared heating devices opened according to the size of the diameter, and compares the temperature value detected by the sensor in real time with the set range value. If the actual value is less than the set value, the output voltage value of the voltage regulator is controlled by the value of the analog output module of the PLC controller, so as to increase the power of the infrared heating device and thus increase the temperature of the tube; if the actual value is greater than the set value, the power of the infrared heating device is reduced and thus reduce the temperature of the tube until the detected value is within the set value range.

[0078] like Figure 6 As shown in the figure, it is a logical control process for cooling the heat shrink tube. The preset value of the tube temperature after cooling is input on the touch screen, and the value is transmitted to the PLC main controller using the analog input module. At the same time, the value of the tube temperature after cooling detected by the sensor in real time is compared with the set range value. If the actual value is greater than the set value, the frequency value of the inverter is controlled by the value of the analog output module of the PLC controller to increase the motor speed and thus increase the water flow rate; if the actual value is less than the set value, the motor speed is reduced and thus the water flow rate is reduced until the detected value is within the set value range.

[0079] In some embodiments, the programmable controller module and the data acquisition module in the PLC controller are both real-time data acquisition.

[0080] The host computer includes a touch screen as a human-computer interaction interface, which is used to display the control status in real time and directly obtain control instructions through the touch screen, so that the host computer transmits the control instructions to the PLC controller for corresponding execution. The touch screen can display the status of the control system in real time and can directly issue action instructions to the control system. The PLC controller receives data through the touch screen and communicates with the PLC controller.

[0081] In some embodiments, the touch screen is used to display control parameters in real time, and the control parameters include at least one of the following: pay-off speed, heating power and the number of heating operations, temperature parameters, cooling medium temperature, cooling water flow rate, tension and diameter. The state parameters of the real-time display control system include pay-off speed parameters in the pay-off mechanism; heating power parameters and the number of heating devices turned on in the heating mechanism; temperature parameters of the heat shrink tube at the outlet of the heating mechanism and the expansion mechanism; cooling water temperature parameters and cooling water flow rate parameters in the expansion mechanism; tension parameters in the tension measuring mechanism; and diameter parameters in the diameter measuring mechanism.

[0082] The PLC controller is connected to the data acquisition device and the execution device respectively, and is used to receive the processed analog quantity, and according to the detected analog quantity, obtain the value of the output analog quantity through the internal logic calculation of the PLC, and give it to the execution device, and then adjust the parameter size in the execution device.

[0083] The PLC controller reads the input analog signal of the data acquisition device in a cyclic scanning manner, and stores the input signal in the input status register; then the input analog signal is calculated according to the internal logical structure of the PLC, and the calculation result is obtained and stored and output to a special data storage area and a special buffer memory; the calculation result directly controls the execution device; wherein the special data storage area and the special buffer memory are both present in the adapter and the expansion module, and are both connected to both ends of the PLC controller.

[0084] In some embodiments, the PLC controller obtains calculation results by referring to historical data in the expansion mold to perform control on the heat shrink tube.

[0085] The same or similar parts between the various embodiments in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the product embodiment described later, since it corresponds to the method, the description is relatively simple, and the relevant parts can be referred to the partial description of the system embodiment.

[0086] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A PLC control system for heat shrinkable tube expansion, characterized in that: It includes a wire-releasing mechanism, a heating mechanism, an expansion mechanism, a tension measuring mechanism, a diameter measuring mechanism and a PLC controller; A wire-releasing mechanism, a heating mechanism, an expansion mechanism, a tension measuring mechanism and a diameter measuring mechanism are arranged along the length direction of the heat shrinkable tube; The wire-releasing mechanism comprises a heat-shrinkable tube reel; The heating mechanism includes a first infrared temperature sensor; the first infrared temperature sensor is arranged between the heating mechanism and the expansion mechanism, and is used to collect the heating temperature of the heat shrink tube at the outlet of the heating mechanism; The expansion mechanism includes a second infrared temperature sensor, which is arranged between the expansion mechanism and the tension measuring mechanism and is used to collect the output temperature of the heat shrink tube at the outlet of the expansion mechanism; The tension measuring mechanism includes a tension sensor, which is arranged at the outlet of the expansion mechanism and is used to collect the tension of the heat shrink tube; the diameter measuring mechanism includes an infrared diameter measuring instrument, which is installed below the tension measuring mechanism and is used to collect the expansion diameter of the heat shrink tube; The first infrared temperature sensor, the second infrared temperature sensor, the tension sensor and the infrared diameter gauge are respectively connected to the PLC controller; Among them, during the wire release process before expansion, the PLC controller controls the heat shrink tube to extend from the heat shrink tube reel to a preset length; the tension sensor is used to detect the tension of the heat shrink tube during the wire release process to ensure that the heat shrink tube will not relax or over-stretch during the wire release process; During the heating process, the PLC controller obtains the heating temperature according to the first infrared temperature sensor to transform the heat shrink tube from a glass state to a highly elastic state; The PLC controller controls the first output temperature of the heat shrink tube at the outlet of the expansion mechanism to be a preset expansion temperature; During the vacuum expansion process, the PLC controller controls the expansion mechanism to rapidly expand the heated heat shrink tube and fix the shape of the expanded heat shrink tube; During the cooling process, the PLC controller controls the initial cooling of the heat shrink tube passing through the first cooling chamber in the expansion mechanism, and obtains a second output temperature after further cooling through the second cooling chamber in the expansion mechanism to fix the shape of the heat shrink tube; wherein cooling water or other cooling media are arranged in the first cooling chamber and the second cooling chamber to cool the heat shrink tube to ensure that the heat shrink tube meets the expansion requirements.

2. The heat shrink tube expansion PLC control system according to claim 1, characterized in that: The PLC controller includes a control module, an analog input module, and an analog output module; The control module is connected to the analog input module and the analog output module respectively; Wherein, the PLC controller obtains various parameters of the heat shrink tube and transmits the various parameters to the analog input module; The analog input module is used to receive the various parameters and transmit them to the control module for processing to obtain calculation results; The control module is used to transmit the operation result to the analog output module to execute control on the heat shrink tube.

3. The heat shrink tube expansion PLC control system according to claim 1 or 2, characterized in that: Also includes: A traction mechanism, which is arranged between the wire-releasing structure and the heating mechanism, or arranged after the diameter measuring mechanism; The traction mechanism comprises a servo motor and a traction wheel; The analog output module in the PLC controller is connected to the servo motor and is used to control the rotation speed of the servo motor according to the calculation result in the analog output module to control the speed and tension of the traction wheel extending the heat shrink tube.

4. The heat shrink tube expansion PLC control system according to claim 1 or 2, characterized in that: The vacuum chamber in the expansion mechanism is arranged in front of the cooling chamber along the flow direction of the cooling medium; The expansion mechanism includes a first vacuum chamber and a second vacuum chamber, the first vacuum chamber is used to quickly expand the heated heat shrink tube, and the second vacuum chamber is used to fix the shape of the expanded heat shrink tube; Each vacuum chamber in the expansion mechanism is connected to a vacuum pump through a vacuum hole; the vacuum pump is used to extract air in the vacuum chamber through the vacuum hole to form a negative pressure environment so that the heat shrink tube can expand in the negative pressure environment; The analog output module of the PLC controller is connected to the vacuum pump to control the extraction speed of the vacuum pump to form a negative pressure environment; Each cooling chamber in the expansion mechanism is provided with a small inlet and outlet hole for the cooling medium and a first motor; The analog output module of the PLC controller is connected to the first motor so as to control the first motor to adjust the flow rate of the cooling medium; A liquid flow sensor is also provided in the cooling chamber; the liquid flow sensor is connected to the analog input module of the PLC controller and is used to detect the flow rate of the cooling medium so as to control the running speed of the first motor to adjust the flow rate of the cooling medium; A liquid temperature sensor is also provided in the cooling chamber, and the liquid temperature sensor is connected to the analog input module of the PLC controller to detect the temperature of the cooling medium to ensure the cooling of the heat shrink tube.

5. The heat shrink tube expansion PLC control system according to claim 1 or 2, characterized in that: The heating mechanism includes an infrared heating device for heating the heat shrink tube; A plurality of infrared heating devices are arranged in the heating mechanism; The analog output module in the PLC controller is connected to the heating mechanism so as to control the heating power of the heating mechanism and the number of infrared heating devices that are turned on for heating.

6. The heat shrink tube expansion PLC control system according to claim 1, characterized in that: It also includes a host computer connected to a PLC controller, wherein the host computer includes a touch screen as a human-computer interaction interface for real-time display of control status and direct acquisition of control instructions through the touch screen so that the host computer transmits the control instructions to the PLC controller for corresponding execution.

7. The heat shrink tube expansion PLC control system according to claim 6, characterized in that: The touch screen is used to display control parameters in real time, and the control parameters include at least one of the following: pay-off speed, heating power and the number of heating operations, temperature parameters, cooling medium temperature, cooling water flow rate, tension and diameter.

8. The heat shrink tube expansion PLC control system according to claim 2, characterized in that: The PLC controller reads the input analog signal corresponding to the acquisition module in a cyclic scanning manner, and stores the input analog signal in the input status register; then operates the input analog signal according to the internal logical structure of the PLC, obtains the operation result, and stores and outputs the operation result to a preset data storage area and a preset buffer memory; the operation result directly controls the corresponding execution module; wherein the preset data storage area and the preset buffer memory are both present in the adapter and the expansion module, and are both connected to both ends of the PLC controller.

9. The heat shrink tube expansion PLC control system according to claim 2, characterized in that: The PLC controller obtains calculation results by referring to historical data in the expansion mold to execute control of the heat shrink tube.

10. A PLC control method for heat shrink tube expansion, characterized in that: The heat shrink tube expansion PLC control system according to any one of claims 1 to 9 comprises: During the wire release process before expansion, the PLC controller controls the heat shrink tube to extend from the heat shrink tube reel to a preset length; the tension sensor is used to detect the tension of the heat shrink tube during the wire release process to ensure that the heat shrink tube will not relax or over-stretch during the wire release process; During the heating process, the PLC controller obtains the heating temperature according to the first infrared temperature sensor to transform the heat shrink tube from a glass state to a highly elastic state; The PLC controller controls the first output temperature of the heat shrink tube at the outlet of the expansion mechanism to be a preset expansion temperature; During the vacuum expansion process, the PLC controller controls the expansion mechanism to rapidly expand the heated heat shrink tube and fix the shape of the expanded heat shrink tube; During the cooling process, the PLC controller controls the initial cooling of the heat shrink tube passing through the first cooling chamber in the expansion mechanism, and obtains a second output temperature after further cooling through the second cooling chamber in the expansion mechanism to fix the shape of the heat shrink tube; wherein cooling water or other cooling media are arranged in the first cooling chamber and the second cooling chamber to cool the heat shrink tube to ensure that the heat shrink tube meets the expansion requirements.

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