Limiting control method and system for roller shutter machine

Abstract

The invention discloses a limiting control method and system for a roller shutter machine, and relates to the technical field of upper and lower limiting automatic control of the roller shutter machine. According to the limiting control method for the roller shutter machine, upper limiting point illumination intensity data and lower limiting point illumination intensity data of a target roller shutter machine are collected; comparing the upper limit illumination intensity data with a preset upper limit illumination threshold value and a preset lower limit illumination threshold value, starting first delay timing when the upper limit illumination intensity data is higher than the upper limit threshold value, generating a first stop signal after timing lasts for a preset first delay time, starting second delay timing when the lower limit illumination intensity data is lower than the lower limit threshold value, and generating a second stop signal after timing lasts for a preset second delay time; according to the method and the device, the collection target roller shutter machine is accurately controlled through the first stop signal and the second stop signal, so that it is guaranteed that the heat preservation quilt is folded in place and does not press and block the air opening, normal opening and closing of the air opening are guaranteed, and the operation and maintenance difficulty is reduced.

Description

A limit control method and system for a roller shutter machine Technical Field

[0001] This invention relates to the field of automatic control technology for upper and lower limits of roller shutter machines, specifically a limit control method and system for roller shutter machines. Background Technology

[0002] In the daily management of solar greenhouses, the accuracy of the upper and lower limit positions of the rolling shutter machine—that is, the positions where the insulation blanket is rolled up and fully laid—is crucial. If the rolling is not done correctly, the greenhouse blanket will be pressed against the upwind vent, affecting its opening and closing; if the front edge of the blanket is not fully laid, it will create a significant heat dissipation gap, resulting in poor insulation performance and substantial heat loss at night, directly impacting crop growth and energy costs; if it is laid too far, the insulation blanket is prone to contact with the ground, causing material damage, difficulty in rolling, and even overload of the drive mechanism, causing it to roll back. Therefore, achieving stable and precise upper and lower limit control is fundamental to ensuring the greenhouse's insulation performance and equipment safety.

[0003] The limitations of existing technologies include at least the following problems: existing technologies are susceptible to loosening of mechanisms, mechanical wear, and obstruction by ice and snow, which can cause the limit points to shift and result in insufficient control accuracy; while electronic counting systems have higher accuracy, they are relatively complex to maintain and debug. In addition, existing technologies are susceptible to accidental interference such as instantaneous light fluctuations, which can cause malfunctions; and the control logic lacks a multi-sensor redundancy verification and collaborative judgment mechanism, which can lead to a sharp drop in reliability when a single sensor fails or is partially blocked, thus easily resulting in inaccurate placement of the insulation blanket. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a limit control method and system for rolling shutter machines, which solves the problem that insufficient precision and poor anti-interference in existing technologies easily lead to inaccurate positioning of the insulation blanket.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a limit control method for a roller shutter machine, comprising the following steps: collecting upper limit point light intensity data and lower limit point light intensity data of the target roller shutter machine; comparing the upper limit point light intensity data with a preset upper limit light threshold; when the first light intensity data is higher than the upper limit light threshold, starting a first delay timer; if the first delay timer continues to reach a preset first delay time, generating a first stop signal to control the target roller shutter machine to stop its upward rolling action; comparing the lower limit point light intensity data with a preset lower limit light threshold; when the lower limit point light intensity data is lower than the lower limit light threshold, starting a second delay timer; if the second delay timer continues to reach a preset second delay time, generating a second stop signal to control the target roller shutter machine to stop its downward rolling action.

[0006] Furthermore, the redundancy judgment of the upper roll limit is performed as follows: collecting pressure data of the contact surface with the insulation blanket; judging the pressure data against a preset pressure threshold; and generating a third stop signal when the pressure data is higher than the pressure threshold.

[0007] Furthermore, the dynamic setting of the delay parameters involves the following steps: receiving a remote instruction from a user terminal, the remote instruction containing several sets of delay time parameter groups; and, based on the remote instruction, calling and activating the corresponding first delay time and second delay time from the delay time parameter groups.

[0008] Furthermore, the upper limit site collaborative judgment involves the following steps: collecting upper limit site illumination intensity data from several monitoring points; comparing the upper limit site illumination intensity data of each monitoring point with the upper limit illumination threshold; and starting the first delay timing based on the judgment result.

[0009] Furthermore, the abnormal handling steps are as follows: if, after the first stop signal is not generated, the pressure data of the rolling action of the shutter machine is detected to be higher than the pressure threshold, then the third stop signal is triggered.

[0010] A limit control system for a roller shutter machine includes: a data acquisition module for acquiring upper limit point light intensity data and lower limit point light intensity data of the target roller shutter machine; an upper limit delay control module for comparing the upper limit point light intensity data with a preset upper limit light threshold, and when the upper limit point light intensity data is higher than the upper limit light threshold, starting a first delay timer and controlling the target roller shutter machine to roll up; and a lower limit delay control module for comparing the lower limit point light intensity data with a preset lower limit light threshold, and when the lower limit point light intensity data is lower than the lower limit light threshold, starting a second delay timer and controlling the target roller shutter machine to lower down.

[0011] The present invention has the following beneficial effects: (1) The limit control method for the rolling shutter machine collects light intensity data of the upper and lower limit points and generates a stop signal by combining delay timing. It is simple to operate and cost controllable. The pressure redundancy judgment of the upper limit and the collaborative judgment of multiple monitoring points provide double protection for the accuracy of the limit and reduce the risk of false triggering of a single signal. The abnormal handling mechanism triggers the protection command when the stop signal fails, avoiding the situation of the insulation being soiled or the drive mechanism being overloaded, so as to ensure that the insulation is put into place without blocking the air vent, ensuring the normal opening and closing of the air vent, and reducing the difficulty of operation and maintenance.

[0012] (2) The limit control system for the rolling shutter machine is specifically responsible for capturing the light intensity data of the upper and lower limit points through the data acquisition module, so as to avoid inaccurate limit due to data deviation. The upper and lower limit delay control modules correspond to the rolling up and lowering actions of the rolling shutter machine, respectively. By comparing the real-time light data with the preset threshold and then combining the delay timer to trigger the stop command, the position of the insulation blanket can be accurately controlled without complicated mechanical adjustment or precision counting. This avoids the problem of easy limit deviation and does not require professional knowledge for installation and maintenance. Farmers can achieve automatic limit through the system without complicated operation. This can prevent the insulation blanket from being laid out in excessive contact with the ground, causing dirt and difficulty in rolling. It can also avoid the blockage of the air vent due to incomplete rolling up and down, and reduce the risk of overload and reverse rolling of the drive mechanism, making the rolling shutter machine run more stably.

[0013] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0014] Figure 1 is a flowchart of a limit control method for a rolling shutter machine according to the present invention.

[0015] Figure 2 is a block diagram of a limit control system for a rolling shutter machine according to the present invention. Detailed Implementation

[0016] Please refer to Figure 1. This invention provides a technical solution: a limit control method for a rolling shutter machine, comprising the following steps: collecting light intensity data at the upper limit and lower limit points of the target rolling shutter machine (using an upper limit light sensor installed at the rear edge of the greenhouse's upwind vent, and a lower limit light sensor installed at the lower edge of the downwind vent or 5-10 cm above the ground, to sense the ambient light intensity in real time; each sensor converts the collected analog light signals into digital signals and transmits them to an IoT controller via wired or wireless communication); and converting the upper limit light intensity data... The data is compared with a preset upper limit light threshold. When the first light intensity data is higher than the upper limit light threshold, the first delay timer is activated. This means the IoT controller reads the real-time light value from the upper limit light sensor and compares it with the user-preset or system-adapted upper limit light threshold. When the real-time value remains higher than the threshold for more than one anti-shake interval (e.g., 0.2 seconds), the controller's internal first timer begins to accumulate time, entering the delay judgment stage. If the first delay timer continues to reach the preset first delay time, a first stop signal is generated, controlling the target roller shutter to stop its upward rolling action. The process is as follows: When the accumulated value of the first timer reaches the preset first delay time (e.g., 3-10 seconds), the controller generates a high-level pulse signal from its digital output terminal as the first stop signal; this signal is transmitted to the time-delay relay 1 connected in the forward rotation control circuit of the roller shutter machine, causing its normally closed contact to open, thereby cutting off the power supply to the forward rotation contactor coil and stopping the motor from rolling up; the lower limit point light intensity data is compared with the preset lower limit light threshold; when the lower limit point light intensity data is lower than the lower limit light threshold, the second delay timer is started, specifically: the IoT controller reads the lower limit light sensor... The real-time value of the device is compared with the set lower limit light threshold (usually set to close to 0 lux or a certain low illumination value); when the real-time value is continuously lower than the threshold for more than the anti-shake interval, the controller's second timer starts timing; if the second delay timer continues to reach the preset second delay time, a second stop signal is generated to control the target roller shutter to stop the lowering action. Specifically, when the second timer accumulates to the second delay time (e.g., 2-8 seconds), the controller generates a second stop signal (high-level pulse), controls the delay relay 2 to act, disconnects the roller shutter reverse control circuit, and the motor stops lowering.

[0017] Specifically, the redundant judgment used for the upper roll limit is as follows: Pressure data of the contact surface with the insulation blanket is collected. Specifically, the pressure sensor installed 20-50cm behind the greenhouse vent acquires the analog pressure signal in real time, and the analog-to-digital conversion module of the IoT controller converts it into a digital pressure value. The pressure data is compared with a preset pressure threshold. Specifically, the IoT controller compares the real-time digital pressure value with the pressure threshold (in kPa or Newton) preset by the user through a mobile application. When the pressure data is higher than the pressure threshold, a third stop signal is generated. Specifically, when the comparison result shows that the digital pressure value continuously exceeds the preset threshold for more than 0.5 seconds (anti-shake time), the signal generation module of the IoT controller generates a high-level third stop signal. The decision logic for stopping the upper roll action is as follows: Once either the first or third stop signal is received, the upper roll machine is controlled to stop. Specifically, when either signal is high, a disconnect command is immediately sent to the control terminal of the time-delay relay 1, causing its normally closed contact to physically separate, thereby cutting off the current path of the forward rotation control circuit of the upper roll machine.

[0018] The dynamic setting of delay parameters involves the following steps: Receiving a remote command from the user terminal, which contains several sets of delay time parameters. Specifically, the user packages the preset first delay time (5 seconds, 8 seconds) and second delay time (3 seconds below the lower limit delay) into a data frame via a mobile app and sends it to the IoT controller via the mobile network. Based on the remote command, the corresponding first and second delay times are called and activated from the delay time parameter set. Specifically, the received data frame is parsed, the new delay time parameter is extracted, and the corresponding preset value of the timer stored internally is immediately updated. Subsequent delay judgments are then performed based on the new parameters.

[0019] In this implementation plan, pressure redundancy judgment is achieved by collecting data from sensors at specific locations, and light delay judgment forms a dual guarantee to avoid inaccurate limit switching caused by a single signal false triggering. Remote debugging is also possible even when not on-site, saving farmers time and effort, and it can be adapted to different scenario requirements.

[0020] Specifically, the upper limit point collaborative judgment involves the following steps: First, upper limit point illumination intensity data are collected from several monitoring points. Specifically, at least two upper limit point illumination sensors installed at three different locations (left, center, and right) along the rear edge of the upwind direction are used to synchronously collect analog illumination intensity signals at their respective locations, which are then converted into digital signals L1, L2, and L3 and transmitted to the IoT controller. Second, the upper limit point illumination intensity data of each monitoring point is compared with the upper limit illumination threshold. Specifically, L1, L2, and L3 are compared with a preset upper limit illumination threshold L_th. Third, based on the judgment result, a first delay timer is initiated. Specifically, the controller performs a logical AND operation on the illumination threshold; the first delay timer is triggered only when the judgment condition is met; otherwise, the trigger is ignored.

[0021] In this implementation scheme, sensors are arranged at multiple positions to collect data from the left, center, and right sides, and then a logical AND operation is performed. This avoids false triggering caused by the obstruction or malfunction of a single sensor, ensuring that the delay is only activated when the limit position is actually reached. The light threshold is adapted to different ambient light conditions, which reduces operational hassle and makes the threshold setting more realistic, further improving the reliability of the limit.

[0022] In this implementation plan, the anomaly handling method determines whether the stop signal is effective when the pressure data of the quilt is higher than the pressure threshold, thereby avoiding problems such as excessive expansion and contraction of the quilt and overload of the drive mechanism, ensuring the safety of the quilt and reducing false triggering.

[0023] Please refer to Figure 2. An embodiment of the present invention provides a technical solution: a limit control system for a roller shutter machine, comprising: a data acquisition module for acquiring upper limit point light intensity data and lower limit point light intensity data of the target roller shutter machine; an upper limit delay control module for comparing the upper limit point light intensity data with a preset upper limit light threshold; when the first light intensity data is higher than the upper limit light threshold, starting a first delay timer and controlling the target roller shutter machine to roll up; and a lower limit delay control module for comparing the lower limit point light intensity data with a preset lower limit light threshold; when the lower limit point light intensity data is lower than the lower limit light threshold, starting a second delay timer and controlling the target roller shutter machine to lower down.

[0024] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0025] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A limit control method for a roller shutter machine, characterized in that, Includes the following steps: Collect the upper limit and lower limit light intensity data of the target roller shutter; The upper limit point light intensity data is compared with a preset upper limit light threshold. When the first light intensity data is higher than the upper limit light threshold, the first delay timer is started. If the first delay timer continues to reach the preset first delay time, a first stop signal is generated to control the target roller shutter to stop the rolling action; the light intensity data of the lower limit point is compared with the preset lower limit light threshold, and when the light intensity data of the lower limit point is lower than the lower limit light threshold, the second delay timer is started; If the second delay timer continues to reach the preset second delay time, a second stop signal is generated to control the target roller shutter to stop the lowering action.

2. The limit control method for a rolling shutter machine according to claim 1, characterized in that, It also includes redundant judgment of the upper roll limit, the steps of which are as follows: collecting pressure data of the contact surface with the insulation blanket; judging the pressure data with a preset pressure threshold; when the pressure data is higher than the pressure threshold, generating a third stop signal.

3. The limit control method for a rolling shutter machine according to claim 1, characterized in that, It also includes the dynamic setting of delay parameters, the steps of which are as follows: receiving a remote instruction from a user terminal, the remote instruction containing several sets of delay time parameter groups; based on the remote instruction, calling and activating the corresponding first delay time and second delay time from the delay time parameter groups.

4. The limit control method for a rolling shutter machine according to claim 1, characterized in that, It also includes upper limit site collaborative judgment, the steps of which are as follows: collect upper limit site light intensity data of several monitoring points; and judge and process the upper limit site light intensity data of each monitoring point with the upper limit light threshold respectively; Based on the judgment result, the first delay timer is started.

5. The limit control method for a rolling shutter machine according to claim 1, characterized in that, The method also includes anomaly handling, the steps of which are as follows: if the pressure data of the rolling action of the roller shutter is detected to be higher than the pressure threshold after the first stop signal is not generated, then the third stop signal is triggered.

6. A limit control system for a roller shutter machine, employing the limit control method for a roller shutter machine as described in any one of claims 1-5, characterized in that, include: The data acquisition module is used to collect the upper limit light intensity data and lower limit light intensity data of the target roller shutter. The upper limit delay control module is used to compare the upper limit point light intensity data with the preset upper limit light threshold. When the first light intensity data is higher than the upper limit light threshold, the first delay timer is started and the target roller shutter is controlled to roll up. The lower limit delay control module is used to compare the light intensity data of the lower limit point with a preset lower limit light threshold. When the light intensity data of the lower limit point is lower than the lower limit light threshold, the second delay timing is started, and the target roller shutter is controlled to lower.

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