Filter switching device with double limiting feedback

Abstract

The utility model provides a dual-limiting feedback filter switching device. The dual-limiting feedback filter switching device comprises an MCU main control chip, a power assembly, two sets of limiting devices, a filter mounting piece and a limiting blocking piece mounted on the filter mounting piece. The limiting blocking pieces comprise the photoelectric limiting blocking piece and the micro-motion limiting blocking piece, and the photoelectric limiting blocking piece and the micro-motion limiting blocking piece are rotationally connected with the power assembly. Each group of limiting device comprises a photoelectric limiting switch and a micro-motion limiting switch which are arranged side by side; when the filter mounting sheet reaches a target position under the rotation of the power assembly, the photoelectric limiting baffle sheet is controlled by the power assembly to move according to a path to trigger the photoelectric limiting switch, and meanwhile, the micro-motion limiting baffle sheet is controlled by the power assembly to move according to the path to trigger the micro-motion limiting switch; the photoelectric limit switch and the micro limit switch generate limit signals and feed the limit signals back to the MCU main control chip; the MCU main control chip controls the power assembly to stop moving when receiving the limiting signal.

Description

Technical Field

[0001] The present application relates to the field of spectral technology, and in particular to a filter switching device with double limit feedback. Background Art

[0002] Infrared detectors can be used with filters of different wavelengths to detect specific gases. Replacing the filter with a filter of the same wavelength as the target gas allows a single infrared detector to detect both gases. However, existing infrared detectors have large optical sensor windows, requiring larger filters. This makes the typical visible light IRCUT structure unsuitable for infrared detectors. A suitable filter switching mechanism is the rotary wheel, but its large size and excessive number of filters increase equipment cost and the appearance of the finished product.

[0003] Combining the IRCUR filter switcher with the rotary filter switcher, a dual filter switcher can be formed using a progressive motor, a limit device, and a filter mounting plate. However, existing limit devices are mostly micro limit switches or photoelectric limit switches. The service life of micro limit switches is significantly affected by the lifespan of the contacts and springs, and the limit accuracy is also low. The accuracy of photoelectric limit switches can be affected by the surrounding environment. When the ambient light is strong, it is easy for the structure to move to a limited position. Although the baffle blocks the LED light, the strong ambient light can still prevent the resistance of the photoresistor from changing significantly, resulting in excessive and uncontrollable movement of the structure. Utility Model Content

[0004] In view of this, the present application proposes a filter switching device with double limit feedback, which has the advantages of long life, high reliability and low cost.

[0005] The present application provides a filter switching device with dual limit feedback, comprising an MCU main control chip, a power component, two sets of limit devices, a filter mounting plate, and a limit stopper mounted on the filter mounting plate;

[0006] The limit block includes a photoelectric limit block and a micro-motion limit block, and the photoelectric limit block and the micro-motion limit block are rotatably connected to the power assembly;

[0007] Each set of limit devices comprises a photoelectric limit switch and a micro limit switch arranged side by side;

[0008] When the filter mounting plate reaches the target position under the rotation of the power assembly, the photoelectric limit blocker is controlled by the power assembly to move along the path, triggering the photoelectric limit switch, and at the same time, the micro-limit blocker is controlled by the power assembly to move along the path, triggering the micro-limit switch;

[0009] The photoelectric limit switch and the micro limit switch generate limit signals which are fed back to the MCU main control chip;

[0010] The MCU main control chip controls the power component to stop moving when receiving the limit signal.

[0011] Furthermore, the power assembly includes a stepper motor, a transmission assembly is fixed on the rotating shaft of the stepper motor, and the transmission assembly is rotatably connected to the filter mounting plate.

[0012] Furthermore, the photoelectric limit switch includes an LED lamp and a photoresistor.

[0013] Furthermore, the photoelectric limit block is controlled by the power assembly to move along a path, blocks the LED light and the photoresistor, and triggers the photoelectric limit switch to generate a first limit signal.

[0014] Furthermore, the micro limit switch includes a tactile switch.

[0015] Furthermore, the micro-motion limit block is controlled by the power assembly to move along a path, presses the touch switch, triggers the micro-motion limit switch, and generates a second limit signal.

[0016] Furthermore, the MCU main control chip is used to record the position information of the filter mounting plate according to the limit signal.

[0017] The utility model has the following advantages over the prior art:

[0018] 1. This utility model uses a stepper motor to rotate the filter, which has the following advantages:

[0019] (1) It has good position accuracy and motion repeatability, with an accuracy of 3% to 5% per step, and the error of each step will not be accumulated to the next step;

[0020] (2) Excellent start-stop and reverse response;

[0021] (3) Long life and high reliability. Since there are no brushes, the life of the motor depends only on the life of the bearings;

[0022] (4) The rotation speed is proportional to the pulse frequency, so there is a relatively wide rotation range;

[0023] (5) Position feedback can be used to achieve closed-loop control.

[0024] These and other aspects of the present application will become more apparent from the following description of the embodiment(s). BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The overall circuit schematic diagram provided for the embodiment of the present application;

[0026] Figure 2 A schematic diagram of the structure provided in an embodiment of the present application.

[0027] It should be understood that the sizes and shapes of the blocks in the above structural diagrams are for reference only and should not constitute an exclusive interpretation of the embodiments of this application. The relative positions and inclusion relationships between the blocks presented in the structural diagrams are only schematic representations of the structural relationships between the blocks, and do not limit the physical connection methods of the embodiments of this application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0029] like Figure 1 As shown, the embodiment of the present application provides a filter switching device with dual limit feedback, including an MCU main control chip, a power component, two sets of limit devices, a filter mounting plate, and a limit block installed on the filter mounting plate;

[0030] The limit block includes a photoelectric limit block and a micro-motion limit block, and the photoelectric limit block and the micro-motion limit block are rotatably connected to the power assembly;

[0031] Each set of limit devices comprises a photoelectric limit switch and a micro limit switch arranged side by side;

[0032] When the filter mounting plate reaches the target position under the rotation of the power assembly, the photoelectric limit blocker is controlled by the power assembly to move along the path, triggering the photoelectric limit switch, and at the same time, the micro-limit blocker is controlled by the power assembly to move along the path, triggering the micro-limit switch;

[0033] The photoelectric limit switch and the micro limit switch generate limit signals which are fed back to the MCU main control chip;

[0034] The MCU main control chip controls the power component to stop moving when receiving the limit signal.

[0035] Specifically, the power assembly includes a stepper motor, a transmission assembly is fixed on the rotating shaft of the stepper motor, and the transmission assembly is rotatably connected to the filter mounting plate.

[0036] The stepper motor is controlled by the MCU main control chip, and controls the left and right rotation of the filter mounting plate through the shaft.

[0037] The filter mounting plate can be used to install filters of the required wavelength band. Controlled by a stepper motor, it moves the target filter stably and quickly in front of the infrared detector. On the left and right sides are high and low blocks 1 (photoelectric limit block) and 2 (micro-limit block), designed based on the structure of micro-limit switches and photoelectric limit switches. When the filter mounting plate moves left or right to a specified position, block 2 (micro-limit block) completely blocks the photoelectric limit switch, while block 1 (photoelectric limit block) completely squeezes the micro-limit switch, providing a limit signal for the stepper motor.

[0038] Specifically, the photoelectric limit switch includes an LED lamp and a photoresistor.

[0039] Specifically, the photoelectric limit block is controlled by the power assembly to move along the path, blocks the LED light and the photoresistor, and triggers the photoelectric limit switch to generate a first limit signal.

[0040] Specifically, the micro limit switch includes a touch switch.

[0041] Specifically, the micro-motion limit block is controlled by the power assembly to move along a path, presses the touch switch, triggers the micro-motion limit switch, and generates a second limit signal.

[0042] Specifically, the micro limit switch consists of a cover, contacts, springs, a base, and pins. Under normal circumstances, the contacts protrude outward, the internal springs are separated from the internal soldering pieces of the base, the circuit is disconnected, and no current flows. When the baffle 1 completely squeezes the contacts, the contacts apply pressure to the springs through the cover. The springs are deformed downward under the pressure and contact the soldering pieces, making the circuit conductive, thereby generating a limit signal that is fed back to the MCU main control chip to control the stepper motor to stop rotating. Based on the feedback signal, the current position information of the filter mounting piece is recorded to achieve closed-loop control. At the same time, when the photoelectric sensor fails, the filter mounting piece is prevented from continuing to rotate to prevent excessive structural movement and uncontrollable situations.

[0043] Preferably, the MCU main control chip is used to record the position information of the filter mounting plate according to the limit signal.

[0044] like Figure 2 The figure shows a schematic structural diagram of the present invention, a filter switching device with dual limit feedback includes:

[0045] A stepper motor, controlled and driven by an MCU, converts pulse signals into angular or linear displacement. When not overloaded, the motor's speed and stopping position depend solely on the frequency and number of pulses, unaffected by load variations. In other words, each pulse applied to the motor rotates one step angle. This linear relationship, coupled with the fact that stepper motors exhibit only periodic errors and no cumulative errors, allows for distinct digital features, high precision, and reliable operation. Position feedback can also be used to implement closed-loop control.

[0046] Filter mounting plate: The structure is equipped with two filter mounting locations, a motor connection location and a limit block. The motor is controlled to move along a certain path. Block 1 (photoelectric limit block) is used to trigger the photoelectric limit switch, and block 2 (micro-limit block) is used to trigger the micro-limit switch.

[0047] Photoelectric limit switch: It consists of an LED lamp and a photoresistor. When the LED lamp and the photoresistor are blocked by a barrier, according to the characteristics of the photoresistor, its resistance value will change significantly, thereby generating a limit signal, which is fed back to the MCU main control chip to control the stepper motor to achieve closed-loop control.

[0048] The micro limit switch consists of a tactile switch. When the filter mounting plate moves to a certain position, its barrier 1 (photoelectric limit barrier) presses against the contact, generating a limit signal that is fed back to the MCU main control chip to control the stepper motor for closed-loop control. The installation position must ensure that barrier 2 (micro limit barrier) completely covers the LED light, allowing barrier 1 (photoelectric limit barrier) to fully trigger the micro limit switch when the limit signal is generated by the photoelectric limit switch.

[0049] The position feedback of the present utility model adopts dual limit feedback of micro-limit switch and photoelectric limit switch. The two limit switches are small in size and highly sensitive, and they compensate for each other's shortcomings. When the ambient light is too strong, even if the baffle 2 (micro-limit baffle) blocks the light of the LED, the photoresistor is affected by the ambient light and cannot generate a limit signal, the baffle 1 (photoelectric limit baffle) can still generate a limit signal by pressing the micro-limit switch. At the same time, it will also prevent the filter plate mounting plate from continuing to rotate, avoiding the situation where the relative position of the mounting plate and the two photoelectric limit switches changes after excessive rotation of the mounting plate, thereby causing the closed-loop control to lose control. When the contacts of the micro-limit switch are damaged or insensitive due to repeated pressing, the photoelectric limit switch can still generate a limit signal to complete the closed-loop control of the stepper motor.

[0050] The utility model has the following advantages over the prior art:

[0051] 1. This utility model uses a stepper motor to rotate the filter, which has the following advantages:

[0052] (1) It has good position accuracy and motion repeatability, with an accuracy of 3% to 5% per step, and the error of each step will not be accumulated to the next step;

[0053] (2) Excellent start-stop and reverse response;

[0054] (3) Long life and high reliability. Since there are no brushes, the life of the motor depends only on the life of the bearings;

[0055] (4) The rotation speed is proportional to the pulse frequency, so there is a relatively wide rotation range;

[0056] (5) Position feedback can be used to achieve closed-loop control.

[0057] It should be noted that the embodiments described in this application are only a part of the embodiments of this application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the above detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the application for protection, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0058] Note that the above are only preferred embodiments of the present application and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present application has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it may also include many other equivalent embodiments, all of which fall within the scope of protection of the present invention.

Claims

1. A filter switching device with double limit feedback, characterized in that: It includes an MCU main control chip, a power component, two sets of limit devices, a filter mounting plate, and a limit stopper installed on the filter mounting plate; The limit block includes a photoelectric limit block and a micro-motion limit block, and the photoelectric limit block and the micro-motion limit block are rotatably connected to the power assembly; Each set of limit devices comprises a photoelectric limit switch and a micro limit switch arranged side by side; When the filter mounting plate reaches the target position under the rotation of the power assembly, the photoelectric limit blocker is controlled by the power assembly to move along the path, triggering the photoelectric limit switch, and at the same time, the micro-limit blocker is controlled by the power assembly to move along the path, triggering the micro-limit switch; The photoelectric limit switch and the micro limit switch generate limit signals which are fed back to the MCU main control chip; The MCU main control chip controls the power component to stop moving when receiving the limit signal.

2. The filter switching device with dual limit feedback according to claim 1, characterized in that: The power assembly includes a stepper motor, a transmission assembly is fixed on the rotating shaft of the stepper motor, and the transmission assembly is rotatably connected to the filter mounting plate.

3. The filter switching device with dual limit feedback according to claim 1, characterized in that: The photoelectric limit switch includes an LED lamp and a photoresistor.

4. The filter switching device with dual limit feedback according to claim 3, characterized in that: The photoelectric limit block is controlled by the power assembly to move along the path, blocks the LED light and the photoresistor, and triggers the photoelectric limit switch to generate a first limit signal.

5. The filter switching device with dual limit feedback according to claim 1, characterized in that: The micro limit switch includes a touch switch.

6. The filter switching device with dual limit feedback according to claim 5, characterized in that: The micro-motion limit block is controlled by the power assembly to move along the path, presses the touch switch, triggers the micro-motion limit switch, and generates a second limit signal.

7. The filter switching device with dual limit feedback according to claim 1, characterized in that: The MCU main control chip is used to record the position information of the filter installation piece according to the limit signal.

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