Target wheel switching device of thermal imager test system
The target wheel switching device driven by the worm gear structure and photoelectric gate sensor solves the problems of complex structure, low positioning accuracy and difficult maintenance of existing devices, and realizes low cost, high precision target switching and convenient maintenance.
Patent Information
- Application Number
- CN202520051059.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2035-01-09
AI Technical Summary
Existing thermal imager target wheel switching devices are complex in structure, have low positioning accuracy, and are difficult to maintain, resulting in high manufacturing costs and poor equipment reliability.
It adopts a worm gear structure, combined with a photoelectric gate sensor and a stepper motor. The worm gear drives the worm wheel to rotate, and the photoelectric gate sensor accurately switches the target, so that any target can be accurately rotated to the highest point of the target wheel. The structure is simple, low-cost and easy to maintain.
It enables precise target switching, reduces manufacturing costs, and improves the positioning accuracy and maintenance convenience of the equipment.
Smart Images
Figure CN223664113U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of thermal imager, especially thermal imager test system target wheel switching device. BACKGROUND
[0002] Thermal imager is widely used in industrial detection, security monitoring and other fields, and its performance test usually needs to be completed through the switching of different targets. However, the existing target wheel switching device has the following problems:
[0003] 1. Complex structure: many devices use high-precision mechanical structures, which have high manufacturing costs.
[0004] 2. Low positioning accuracy: due to the limitations of control logic or the performance of driving devices, the switching positioning accuracy is poor, which causes the target to be unable to be accurately aligned.
[0005] 3. Difficult to maintain: complex structure design makes it difficult to maintain and debug, affecting the long-term reliability of the equipment. INVENTION CONTENTS
[0006] In view of the above problems existing in the existing target wheel switching device, the present application aims to provide a thermal imager test system target wheel switching device with simple structure, low cost, high positioning accuracy and easy maintenance.
[0007] The specific technical scheme is as follows:
[0008] A thermal imager test system target wheel switching device, comprising:
[0009] A support, a worm gear is rotatably installed on the support, and a plurality of targets are arranged at equal intervals around the worm gear;
[0010] A plurality of photoelectric door sensors are installed on the support;
[0011] A photoelectric door baffle is installed on the worm gear, and the motion track formed by the photoelectric door baffle when the plurality of photoelectric door sensors rotate one revolution around the worm gear is distributed at equal intervals;
[0012] A worm is rotatably arranged on the support and is connected with the worm gear in meshing;
[0013] A motor is installed on the support and is connected with the worm in transmission, for driving the worm to rotate, and the plurality of photoelectric door sensors are electrically connected with the motor.
[0014] As a further improvement and optimization of the present application, the photoelectric door baffle is located on the line between one of the targets and the center of the worm gear.
[0015] As a further improvement and optimization of the present solution, the targets have eight.
[0016] As a further improvement and optimization of the present solution, the photoelectric gate sensors have four, and are sequentially first photoelectric gate sensor, second photoelectric gate sensor, third photoelectric gate sensor, fourth photoelectric gate sensor in the circumferential direction, and the connection between the first photoelectric gate sensor and the third photoelectric gate sensor is perpendicular to the optical platform, and the connection between the second photoelectric gate sensor and the fourth photoelectric gate sensor is parallel to the optical platform.
[0017] As a further improvement and optimization of the present solution, the worm gear has eight hole positions, and the eight targets are respectively installed at the eight hole positions.
[0018] As a further improvement and optimization of the present solution, the worm gear further has an installation hole, and the photoelectric gate shutter is installed at the installation hole.
[0019] As a further improvement and optimization of the present solution, the motor comprises:
[0020] The step motor is drivingly connected with the worm through a shaft coupling;
[0021] The motor driver is electrically connected with the step motor;
[0022] The motor controller is electrically connected with the motor driver and is electrically connected with the four photoelectric gate sensors.
[0023] As a further improvement and optimization of the present solution, the motor driver and the step motor, the motor driver and the motor controller, and the four photoelectric gate sensors and the motor controller are electrically connected through wires.
[0024] As a further improvement and optimization of the present solution, the gear ratio of the worm and the step motor is 360:1.
[0025] The above technical solution has the following positive effects compared with the prior art:
[0026] In the utility model, the motor drives the worm gear (i.e. target wheel) to rotate through the worm, the target can be accurately switched, and any target can be accurately rotated to the highest point of the target wheel, i.e. the center of the corresponding target hole is higher than the center of the target wheel, and the line segment formed by the center of the target wheel is perpendicular to the optical platform, so that the structure is simple, the cost is low, and the maintenance is convenient. BRIEF DESCRIPTION OF DRAWINGS
[0027] Figure 1 It is a structural schematic view of the target wheel switching device of the thermal imager test system.
[0028] Figure 2 The utility model relates to a kind of electrical wiring diagram of thermal imager test system target wheel switching device of the utility model,
[0029] Figure 3 The utility model relates to a kind of control flow chart of thermal imager test system target wheel switching device of the utility model,
[0030] In the drawing: 1, support;2, worm wheel;3, target;4, worm;5, motor;6, photoelectric gate baffle;7, photoelectric gate sensor;51, stepper motor;52, motor driver;53, motor controller. DETAILED DESCRIPTION
[0031] The technical scheme of the utility model will be described clearly and completely in combination with the drawings, obviously, the described embodiment is a part of the embodiment of the utility model, not all embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of the utility model protection.
[0032] In the description of the utility model, it needs to be explained that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. appear, the indicated orientation or position relationship based on the orientation or position relationship shown in the drawing is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model. In addition, if the terms "first", "second", "third" appear, they are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0033] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connection" appear, they should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected;Can be mechanically connected, or electrically connected;Can be directly connected, or indirectly connected through intermediate medium;It can be the communication inside two elements. For the person skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.
[0034] Figure 1 The utility model relates to a kind of structure schematic diagram of thermal imager test system target wheel switching device of the utility model, Figure 2 The utility model relates to a kind of electrical wiring diagram of thermal imager test system target wheel switching device of the utility model, Figure 3 The utility model relates to a kind of control flow chart of thermal imager test system target wheel switching device of the utility model, such as Figures 1-3As shown, a target wheel switching device of a thermal imager testing system is shown, including a support 1, a plurality of photoelectric gate sensors 7, a photoelectric gate baffle 6, a worm 4 and a motor 5, the support 1 is rotatably provided with a worm wheel 2, a plurality of targets 3 are equidistantly arranged on the worm wheel 2 in a circumferential direction, the plurality of photoelectric gate sensors 7 are arranged on the support 1, the photoelectric gate baffle 6 is arranged on the worm wheel 2, and the motion track of the photoelectric gate baffle 6 is equidistantly distributed along the worm wheel 2 when the plurality of photoelectric gate sensors 7 rotate one circle, the worm 4 is rotatably arranged on the support 1 and is in meshing connection with the worm wheel 2, the motor 5 is arranged on the support 1 and is in driving connection with the worm 4, and the motor 5 is used for driving the worm 4 to rotate, and the plurality of photoelectric gate sensors 7 are in electrical connection with the motor 5.
[0035] In the embodiment, the motor drives the worm wheel (i.e. the target wheel) to rotate through the worm 4, which can accurately switch the targets and rotate any target to the highest point of the target wheel, i.e. the center of the corresponding target hole is higher than the center of the target wheel and the line segment formed by the center of the target hole and the center of the target wheel is perpendicular to the optical platform, so that the structure is simple, the cost is low, and the maintenance is convenient.
[0036] Further, as a preferred embodiment, the photoelectric gate baffle 6 is located on the line between one of the targets 3 and the center of the worm wheel 2.
[0037] Further, as a preferred embodiment, the target 3 has eight targets.
[0038] Further, as a preferred embodiment, the photoelectric gate sensor 7 has four photoelectric gate sensors, and the four photoelectric gate sensors are sequentially a first photoelectric gate sensor 7, a second photoelectric gate sensor 7, a third photoelectric gate sensor 7 and a fourth photoelectric gate sensor 7 in the circumferential direction, and the line between the first photoelectric gate sensor 7 and the third photoelectric gate sensor 7 is perpendicular to the optical platform, and the line between the second photoelectric gate sensor 7 and the fourth photoelectric gate sensor 7 is parallel to the optical platform.
[0039] Further, as a preferred embodiment, the worm wheel 2 has eight hole positions, and the eight targets 3 are respectively arranged at the eight hole positions.
[0040] Further, as a preferred embodiment, the worm wheel 2 further has a mounting hole, and the photoelectric gate baffle 6 is arranged at the mounting hole.
[0041] Further, as a preferred embodiment, the motor 5 comprises a stepper motor 51, a motor driver 52 and a motor controller 53, the stepper motor 51 is connected with the worm 4 through a shaft coupling, the motor driver 52 is electrically connected with the stepper motor 51, the motor controller 53 is electrically connected with the motor driver 52, and is respectively electrically connected with the four photoelectric gate sensors 7, the photoelectric gate sensors 7 provide IO switch signals, the photoelectric gate stopper 6 is at the center of the photoelectric gate, and the photoelectric gate outputs a switch signal 0; the photoelectric gate stopper 6 is not at the center of the photoelectric gate, and the photoelectric gate outputs a switch signal 1.
[0042] Further, the motor controller 53 comprises a power management unit, a single-chip microcomputer unit and a level conversion unit, the power management unit converts AC 220V into DC 3.3V, 5V and 24V, the single-chip microcomputer unit has at least four external interrupt input IOs, a 1MHz timer and three output IOs, the four external interrupt input IOs receive switch signals from the four photoelectric gate sensors 7, the three output IOs are used for controlling the motor driver 52, providing motor enable, motor rotation direction and rotation pulse control PWM signal, and the timer is used for providing a time reference required for generating the PWM signal, and the level conversion unit converts logic levels of the single-chip microcomputer into photoelectric gate switch signal levels and motor driver 52 control levels. The motor driver 52 receives control signals of the motor controller 53 and drives the stepper motor 51 to rotate a corresponding control angle.
[0043] Further, as a preferred embodiment, the motor driver 52 is electrically connected with the stepper motor 51, the motor driver 52 is electrically connected with the motor controller 53, and the four photoelectric gate sensors 7 are respectively electrically connected with the motor controller 53.
[0044] Further, as a preferred embodiment, the gear ratio of the worm 4 and the stepper motor is 360:1.
[0045] The control method of the target wheel switching device is as follows:
[0046] Suppose that the hole position of the target 3 where the photoelectric gate stopper 6 is located is marked as No. 0 hole position, and other hole positions of the target 3 are sequentially marked as No. 1, 2, 3, 4, 5 and 6 hole positions along the clockwise direction of the target wheel.
[0047] Switching to the No. 0 hole position of the target 3, the single-chip microcomputer controls the stepper motor 51 to rotate and drive the target wheel to rotate counterclockwise, the single-chip microcomputer opens an external interrupt, and when detecting an IO interrupt of the first photoelectric gate sensor 7 switch signal, controls the stepper motor 51 to rotate an angle x0_0 and then stop.
[0048] Switch to the 3 hole position of the 1st target, the single-chip microcomputer controls the stepper motor 51 to rotate to drive the target wheel to rotate counterclockwise, the single-chip microcomputer opens the external interrupt, when the first photoelectric gate sensor 7 switch IO interrupt is detected, the stepper motor 51 is controlled to rotate an angle x0_1 and then stop.
[0049] Switch to the 3 hole position of the 2nd target, the single-chip microcomputer controls the stepper motor 51 to rotate to drive the target wheel to rotate counterclockwise, the single-chip microcomputer opens the external interrupt, when the second photoelectric gate sensor 7 switch IO interrupt is detected, the stepper motor 51 is controlled to rotate an angle x1_0 and then stop.
[0050] Switch to the 3 hole position of the 3rd target, the single-chip microcomputer controls the stepper motor 51 to rotate to drive the target wheel to rotate counterclockwise, the single-chip microcomputer opens the external interrupt, when the second photoelectric gate sensor 7 switch IO interrupt is detected, the stepper motor 51 is controlled to rotate an angle x1_1 and then stop.
[0051] Switch to the 3 hole position of the 4th target, the single-chip microcomputer controls the stepper motor 51 to rotate to drive the target wheel to rotate counterclockwise, the single-chip microcomputer opens the external interrupt, when the third photoelectric gate sensor 7 switch IO interrupt is detected, the stepper motor 51 is controlled to rotate an angle x2_0 and then stop.
[0052] Switch to the 3 hole position of the 5th target, the single-chip microcomputer controls the stepper motor 51 to rotate to drive the target wheel to rotate counterclockwise, the single-chip microcomputer opens the external interrupt, when the third photoelectric gate sensor 7 switch IO interrupt is detected, the stepper motor 51 is controlled to rotate an angle x2_1 and then stop.
[0053] Switch to the 3 hole position of the 6th target, the single-chip microcomputer controls the stepper motor 51 to rotate to drive the target wheel to rotate counterclockwise, the single-chip microcomputer opens the external interrupt, when the fourth photoelectric gate sensor 7 switch IO interrupt is detected, the stepper motor 51 is controlled to rotate an angle x3_0 and then stop.
[0054] Switch to the 3 hole position of the 7th target, the single-chip microcomputer controls the stepper motor 51 to rotate to drive the target wheel to rotate counterclockwise, the single-chip microcomputer opens the external interrupt, when the fourth photoelectric gate sensor 7 switch IO interrupt is detected, the stepper motor 51 is controlled to rotate an angle x3_1 and then stop.
[0055] Specifically, the attached Figure 3 is a control flow chart of the target wheel switching device, combined with the attached Figure 2 turbine target 3 hole position and photoelectric gate shutter 6, the attached Figure 3 X value is 0, 1, 2, 3, 4, 5, 6, 7, wherein the position X and the target 3X correspond to the target 3 hole position X, the photoelectric gate shutter 621 is located in the 0th hole position, and the other target 3 hole positions are marked as 1, 2, 3, 4, 5, 6, 7 in sequence along the target wheel clockwise. The specific process is as follows:
[0056] 1. Initialize the position X interrupt flag variable to 0;
[0057] 2. Real-time detection whether switching target 3 is needed, if switching target 3 to position X, then jump to step 3;
[0058] 3. Enable the motor, rotate the motor clockwise;
[0059] 4. Real-time detection whether the position X interrupt flag bit is set to 1, if set to 1, then jump to step 5. The interrupt flag bit is completed when the single-chip microcomputer receives the photoelectric gate sensor 7 IO signal, wherein the first photoelectric gate sensor 7 interrupt signal is received, the position 0, 1 flag bit is set to 1, the second photoelectric gate sensor 7 interrupt signal is received, the position 2, 3 flag bit is set to 1, the third photoelectric gate sensor 7 interrupt signal is received, the position 4, 5 flag bit is set to 1, and the fourth photoelectric gate sensor 7 interrupt signal is received, the position 6, 7 flag bit is set to 1.
[0060] 5. Obtain the motor rotation angle y according to the table lookup, and control the motor to rotate y angles
[0061] 6. Return to step 1, and perform the next target wheel switching.
[0062] The table lookup data in the above step 5 is recorded after the target wheel switching device is assembled, and the calibration method is as follows:
[0063] Taking position 0 and position 1 as examples, the motor controller 53 controls the motor to rotate, and the turbine synchronously rotates clockwise. When the photoelectric gate shutter 6 of the turbine triggers the first photoelectric gate sensor 7 to send a trigger level falling edge jump signal, the motor controller 53 causes an interrupt, and then the motor rotation is stopped. Then, whether the center of the target 30(1) falls in the off-axis center of the light path is determined through the theodolite and the off-axis parallel light path. If the center of the target 30(1) does not fall in the off-axis center of the light path, the motor is controlled to rotate step by step until the center of the target 30(1) falls in the off-axis center of the light path. The number of step-by-step pulses of the motor from the stop of the first photoelectric gate sensor 7 to the center of the target 30(1) falling in the off-axis center of the light path is recorded as the control pulse quantity of the rotation angle x0_0(x0_1) of position 0(1). According to the same logic, the rotation angle quantities x1_0, x1_1, x2_0, x2_1, x3_0, x3_1 of the target 3 hole positions 2-7 are counted through the second photoelectric gate sensor 7, 2, 3.
[0064] The above only describes the preferred embodiments of the present application, and does not limit the implementation and protection scope of the present application. For those skilled in the art, it should be realized that any equivalent replacement and obvious changes made according to the content of the present application should be included in the protection scope of the present application.
Claims
1. A target wheel switching device for a thermal imager testing system, characterized in that, include: A support frame on which a worm gear is rotatably mounted, and multiple targets are evenly spaced along the circumference of the worm gear; Multiple photoelectric gate sensors are mounted on the bracket. A photoelectric door baffle is mounted on the worm gear, and the motion track formed by the photoelectric door baffle is evenly distributed when multiple photoelectric door sensors rotate one revolution along the worm gear; A worm gear, which is rotatably mounted on the bracket and meshes with the worm wheel; The motor is mounted on the bracket and connected to the worm gear transmission for driving the worm gear to rotate, and the plurality of photoelectric gate sensors are electrically connected to the motor.
2. The target wheel switching device of the thermal imager testing system according to claim 1, characterized in that, The photoelectric gate baffle is located on the line connecting one of the targets and the center of the worm gear.
3. The target wheel switching device of the thermal imager testing system according to claim 1, characterized in that, There are eight targets.
4. The target wheel switching device of the thermal imager testing system according to claim 3, characterized in that, The photoelectric gate sensor has four components, which are arranged in circumferential order as a first photoelectric gate sensor, a second photoelectric gate sensor, a third photoelectric gate sensor, and a fourth photoelectric gate sensor. The line connecting the first photoelectric gate sensor and the third photoelectric gate sensor is perpendicular to the optical platform, and the connection between the second photoelectric gate sensor and the fourth photoelectric gate sensor is parallel to the optical platform.
5. The target wheel switching device of the thermal imager testing system according to claim 4, characterized in that, The worm gear has eight holes, and the eight targets are respectively installed at the eight holes.
6. The target wheel switching device of the thermal imager testing system according to claim 4, characterized in that, The worm gear also has a mounting hole, and the photoelectric gate baffle is mounted at the mounting hole.
7. The target wheel switching device of the thermal imager testing system according to claim 4, characterized in that, The motor includes: A stepper motor, wherein the stepper motor and the worm gear are connected by a coupling for transmission; A motor driver, which is electrically connected to the stepper motor; The motor controller is electrically connected to the motor driver and electrically connected to each of the four photoelectric gate sensors.
8. The target wheel switching device of the thermal imager testing system according to claim 7, characterized in that, The motor driver and the stepper motor, the motor driver and the motor controller, and the four photoelectric gate sensors and the motor controller are all electrically connected by wires.
9. The target wheel switching device of the thermal imager testing system according to claim 7, characterized in that, The gear ratio between the worm gear and the stepper motor is 360:1.