Infrared optical transfer function measuring instrument target wheel switching positioning device and method

Abstract

The present application relates to a kind of infrared optical transfer function measuring instrument target wheel switching positioning device and method, wherein there are nested rotary mechanism, V-shaped groove elastic positioning structure, photoelectric switch and the target wheel component of step motor combination control, realize target and filter accurate switching, positioning function;The switching positioning device is applied to the target wheel in the target generator of infrared optical transfer function measuring instrument, and the rotation switching and accurate positioning of target and filter therein are realized, and switching positioning device includes support, rotation switching mechanism, positioning mechanism and control circuit module, the support is integrated structure support, and the rotation switching mechanism and positioning mechanism in it are all assembled in the positioning structure of support.The target wheel switching positioning device of the present application adopts photoelectric light and step motor control mode, and combines nested rotary mechanism and V-shaped groove elastic positioning structure simultaneously, to ensure the high-precision electrical control of the structure of target and filter in the process of rotation switching.

Description

TECHNICAL FIELD

[0001] The present application relates to photoelectric imaging assembly technology, in particular to an infrared optical transfer function measuring instrument target wheel switching positioning device and method, which can realize the rotation switching and accurate positioning of the target and the optical filter, and is suitable for the switching and positioning control of similar photoelectric detection equipment. BACKGROUND

[0002] The infrared optical transfer function measuring instrument is a general optical measurement instrument.

[0003] The target wheel component is a key component of the instrument, which provides a target for the measured optical system, and needs to select a corresponding optical filter according to the working wavelength of the measured optical system. Since the instrument has high testing accuracy, the target has many shapes (a total of 16), and high accuracy is required for the repeated positioning of the target. Therefore, it is necessary to design a rotating switching and positioning target wheel component with high reliability, high accuracy and good assembly and adjustment process, which is one of the necessary conditions for realizing the function of the instrument. SUMMARY

[0004] In order to solve the problem of the repeated positioning accuracy of the target and the need for reliable technology, the present application provides an infrared optical transfer function measuring instrument target wheel switching positioning device, which comprises a nested rotating mechanism, a V-shaped groove elastic positioning structure, a photoelectric switch and a stepping motor combination control target wheel component, which realizes the accurate switching and positioning of the target and the optical filter. The switching and positioning device is applied to the target wheel of the infrared optical transfer function measuring instrument target generator, and realizes the rotation switching and accurate positioning of the target and the optical filter. The switching and positioning device comprises a support, a rotating switching mechanism, a positioning mechanism and a control circuit module. The support is an integrated structural support. The rotating switching mechanism and the positioning mechanism are assembled in the positioning structure of the support. The rotating switching mechanism comprises a bearing seat, a target rotating wheel, a large bearing, a large gear, a target wheel stepping motor, a target wheel motor gear, an optical filter rotating wheel, a small bearing, a pressing ring, a fan gear, an optical filter stepping motor and an optical filter motor gear. The target rotating wheel is uniformly provided with sixteen mounting holes in the circumferential direction on the surface feature, and the target is fixed in the corresponding mounting hole. The outer cylindrical end face of the target rotating wheel is uniformly designed with sixteen V-shaped positioning grooves. The optical filter rotating wheel is designed with three mounting holes on one side, and the outer cylindrical end face of the optical filter rotating wheel is provided with three V-shaped positioning grooves. The optical filter is fixed in the mounting hole.

[0005] The positioning mechanism realizes accurate positioning of the target and the filter at a specified position, and comprises two groups of top bead components, a photoelectric switch I, a switch baffle I, a photoelectric switch II and a switch baffle II. The top bead component comprises a top column seat, a steel ball, a compression spring and an adjusting screw sleeve. The top bead component is assembled on one side of the positioning abutting surface of the support, and the assembled steel ball, compression spring and adjusting screw sleeve are arranged on the center line in the top column seat. The center line in the top column seat is perpendicular to the normal line of the circle of the outer cylindrical end surface of the filter rotating wheel. The compression spring is arranged between the steel ball and the adjusting screw sleeve, and the adjusting screw sleeve can be rotated to adjust the compression force of the compression spring, so that the steel ball has the freedom of moving up and down along the center line.

[0006] The control circuit module comprises a single-chip microcomputer, a step motor driving chip I and a step motor driving chip II. The single-chip microcomputer is connected with the step motor driving chip I and the step motor driving chip II through communication signals of enable, direction and pulse signals.

[0007] In an embodiment of the present application, the two ends of the bearing seat inner diameter are assembled with large bearings, the shaft body arranged at the center of the target rotating wheel passes through the inner hole of the large bearing, and the shaft is axially fixed by using a large gear, and the assembly with the bearing seat forms a local feature about the target rotating wheel, and is assembled at the center of the support. The target wheel motor gear is assembled on the output power shaft of the target wheel step motor, and the installation position is adjusted to be connected with the large gear in meshing, thereby constituting a rotating switching mechanism module about the target.

[0008] In an embodiment of the present application, a plurality of small bearings are arranged in the inner hole of the target rotating wheel, the shaft body arranged at the center of the filter rotating wheel passes through the inner hole of the large bearing, and is axially fixed by using a compression ring. The sector gear is arranged on the circumferential end surface of the filter rotating wheel, and the filter motor gear is assembled on the output power shaft of the filter step motor, and the installation position is adjusted to be connected with the sector gear in meshing, thereby constituting a rotating switching mechanism module about the filter.

[0009] In an embodiment of the present application, the photoelectric switch I and the photoelectric switch II are arranged on one side of the target wheel step motor and the filter step motor respectively, and are connected with the I / O port of the single-chip microcomputer through signal communication. The switch baffle I is arranged on the target rotating wheel, and the switch baffle II is arranged on the filter rotating wheel.

[0010] In an embodiment of the present application, the step motor driving chip I and the step motor driving chip II are both MS35775, which is a two-phase chip. The pin ENN is a motor driving enable. When the ENN is at a low level, the output driving is opened, and when the ENN is at a high level, the output is closed. The pin DIR is a direction control. The high and low levels control the forward or reverse rotation of the motor. The pin STEP is a motor step input. Each pulse controls the motor to rotate one step.

[0011] The application also provides a control method of target wheel switching positioning, which is driven by a control circuit module and relies on a switching positioning device, and comprises the following control steps:

[0012] After the device is powered on, the single-chip microcomputer generates an enable signal, a direction signal and a pulse signal, which are sent to the stepper motor driving chip I to drive the target wheel stepper motor to rotate in a direction, so as to drive the target wheel to rotate;

[0013] The single-chip microcomputer detects the signal output by the photoelectric switch I after each pulse, and immediately turns off the enable signal to stop the rotation of the target wheel stepper motor when the signal is triggered, so that the target wheel zero-return action is completed;

[0014] After the target wheel zero-return action is completed, the single-chip microcomputer controls the stepper motor driving chip II to complete the filter zero-return action, and the process is consistent with the target wheel zero-return action;

[0015] After the target wheel zero-return and the filter zero-return, the single-chip microcomputer can receive the target and filter selection instructions;

[0016] After the single-chip microcomputer receives the target or filter selection instruction, the number of steps between the current position and the target position of the target or filter (including the number of steps between the zero positions of each target / filter, which is obtained through previous calibration) is calculated through table lookup, and the product enable and pulse signals are used to control the rotation of the target wheel stepper motor (or the filter stepper motor);

[0017] The single-chip microcomputer counts each driving pulse, and when the number of pulses reaches the calculated number of steps, the enable signal is turned off to stop the rotation of the stepper motor, at which time the steel ball of the top bead component also falls into the V-shaped groove for precise positioning.

[0018] The above technical scheme of the application has the following advantages compared with the prior art: the target wheel switching positioning device of the application adopts a photoelectric opening and stepper motor control mode, and combines a nested rotating mechanism and a V-shaped groove elastic positioning structure to ensure high-precision electrical control of the structure during the rotation and switching of the target and the filter, wherein each mechanism adopts a combined driving design mode, which is compact in structure, simple and convenient to operate and high in reliability. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to make the content of the application more easily understood, the application will be further described in detail below according to specific embodiments of the application and in conjunction with the drawings.

[0020] Figure 1 is a structural schematic view of the target wheel switching positioning device of the infrared optical transfer function measuring instrument of the application;

[0021] Figure 2It is the cross section schematic diagram of the target wheel switching positioning device of the present application;

[0022] Figure 3 It is the system schematic diagram of the control circuit module of the present application;

[0023] Figure 4 It is the pin information transmission schematic diagram of the single-chip microcomputer of the present application;

[0024] Figure 5 It is the structure schematic diagram of the top bead component of the present application;

[0025] Figure 6 It is the program flow chart of the control method of the target wheel switching positioning of the present application.

[0026] As shown in the figure: 1, support, 2, target, 3, filter, 4, bearing seat, 5, target rotating wheel, 6, large bearing, 7, large gear, 8, target wheel stepping motor, 9, target wheel motor gear, 10, filter rotating wheel, 11, small bearing, 12, pressure ring, 13, fan gear, 14, filter stepping motor, 15, filter motor gear, 16, top column seat, 17, steel ball, 18, compression spring, 19, adjusting screw sleeve, 20, photoelectric switch I, 21, switch stop sheet I, 22, photoelectric switch II, 23, switch stop sheet II, 24, single-chip microcomputer, 25, stepping motor drive chip I, 26, stepping motor drive chip II. DETAILED DESCRIPTION

[0027] As Figure 1 and Figure 2 shown, the embodiment provides a kind of infrared optical transfer function measuring instrument target wheel switching positioning device, the switching positioning device is applied to the target wheel in infrared optical transfer function measuring instrument target generator, rotation switching and accurate positioning are realized to target 2, filter 3 therein, switching positioning device includes support 1, rotating switching mechanism, positioning mechanism and control circuit module, the support 1 is the structure support of integral, rotating switching mechanism and positioning mechanism in it are all assembled in the positioning structure of support 1, wherein rotating switching mechanism includes bearing seat 4, target rotating wheel 5, large bearing 6, large gear 7, target wheel stepping motor 8, target wheel motor gear 9, filter rotating wheel 10, small bearing 11, pressure ring 12, fan gear 13, filter stepping motor 14, filter motor gear 15;Wherein target rotating wheel 5 is uniformly provided with sixteen installation holes along the circumferential direction on surface feature, while target 2 is fixed in corresponding installation hole, and the outer cylindrical end face of target rotating wheel 5 is uniformly designed with sixteen V-shaped positioning grooves;In addition, filter rotating wheel 10 side is designed with three installation holes, and the outer cylindrical end face of filter rotating wheel 10 is provided with three V-shaped positioning grooves, wherein filter 3 is fixed in installation hole;

[0028] Specifically, the bracket 1 is a structural support of the whole component, and the rotation switching mechanism and the positioning mechanism are both fixedly installed in the component; meanwhile, the target rotating wheel 5 is provided with sixteen target mounting holes, and the sixteen V-shaped positioning grooves are in a corresponding relationship, and the filter rotating wheel 10 has three filter mounting holes and also has three V-shaped positioning grooves in a corresponding relationship.

[0029] The positioning mechanism realizes accurate positioning of the target 2 and the filter 3 at a specified position, and the positioning mechanism comprises two groups of top bead components, a photoelectric switch I 20, a switch baffle I 21, a photoelectric switch II 22 and a switch baffle II 23. The top bead component comprises a top column seat 16, a steel ball 17, a compression spring 18 and an adjusting screw sleeve 19. The top bead component takes the top column seat 16 as a base body and is assembled to one side of the positioning abutting surface on the bracket 1. The assembled steel ball 17, compression spring 18 and adjusting screw sleeve 19 are arranged on the center line in the top column seat 16. Meanwhile, the center line in the top column seat 16 is perpendicular to the normal line of the circle where the outer cylindrical end surface of the filter rotating wheel 10 is located. The compression spring 18 is arranged between the steel ball 17 and the adjusting screw sleeve 19. The rotation of the adjusting screw sleeve 19 can adjust the pressure of the compression spring 18, so that the steel ball 17 has the freedom to move up and down along the center line.

[0030] Further, as shown in Figure 1 and Figure 5 , the positioning mechanism is fixedly installed on the bracket 1 and abuts against the outer edge of the rotating wheel. The installation position of the top bead component is designed to have a positioning abutting surface, which ensures that the vector of the positioning pressure of the steel ball 17 points to the center of the rotating shaft, i.e. the center of the filter rotating wheel 10, thereby improving the structural positioning accuracy. The rotation of the adjusting screw sleeve 19 can adjust the pressure of the compression spring 18, so that the steel ball 17 can smoothly enter and leave the V-shaped groove without jamming.

[0031] As shown in Figure 3 , the control circuit module comprises a single-chip microcomputer 24, a step motor driving chip I 25 and a step motor driving chip II 26. The single-chip microcomputer 24 is connected with the step motor driving chip I 25 and the step motor driving chip II 26 through chip pins and is provided with communication signal connections of enable, direction and pulse signals.

[0032] The photoelectric switch I 20 and the photoelectric switch II 22 are arranged on one side of the target wheel step motor 8 and the filter step motor 14 respectively, and the photoelectric switch I 20 and the photoelectric switch II 22 are connected with the I / O port of the single-chip microcomputer 24 through signal communication. The switch baffle I 21 is arranged on the target rotating wheel 5, and the switch baffle II 23 is arranged on the filter rotating wheel 10.

[0033] One of the target wheel switching positioning control methods is based on the control of the control circuit module and relies on the switching positioning device design, and comprises the following control steps:

[0034] After the device is powered on, the single-chip microcomputer 24 generates an enable signal, a direction signal and a pulse signal, which are sent to the stepper motor drive chip I 25 to drive the target wheel stepper motor 8 to rotate in a direction, thereby driving the target wheel 5 to rotate. The single-chip microcomputer 24 detects the signal output by the photoelectric switch I 21 after each pulse, and when the signal is triggered, the single-chip microcomputer 24 immediately turns off the enable signal to stop the target wheel stepper motor 8 from rotating, and the target wheel zeroing action is completed.

[0035] After the target wheel zeroing action is completed, the single-chip microcomputer 24 controls the stepper motor drive chip II 26 to complete the filter wheel zeroing action, and the process is consistent with the target wheel zeroing action.

[0036] After the target wheel zeroing and the filter wheel zeroing are completed, the single-chip microcomputer 24 can receive the target and filter selection instructions.

[0037] After the single-chip microcomputer 24 receives the target or filter selection instruction, the number of steps between the current position and the target position of the target or filter is calculated through table lookup (the number of steps between each target / filter, including the zero position, is obtained through previous calibration), and the product enable and pulse signals are used to control the target wheel stepper motor 25 (or the filter wheel stepper motor 26) to rotate. The single-chip microcomputer 24 counts each driving pulse, and when the number of pulses reaches the calculated number of steps, the enable signal is turned off to stop the stepper motor from rotating. At this time, the steel ball 17 of the top bead component also falls into the V-shaped groove for precise positioning.

[0038] Specifically, the photoelectric switch I 20 and the switch stopper I 21 are used to realize the initial positioning of the target rotating wheel, and the photoelectric switch II 22 and the switch stopper II 22 are used to realize the initial positioning of the filter rotating wheel. The photoelectric switch I 20 and the photoelectric switch I 21 are fixed at different positions of the support 1, and their output signals are connected to different I / O ports of the single-chip microcomputer 24. When the photoelectric switch is not blocked, the output signal is 1, and when it is blocked, the output signal is 0. The switch stopper I 21 is fixed on the target rotating wheel, and the switch stopper II 22 is fixed on the filter rotating wheel.

[0039] The bearing seat 4 is provided with a large bearing 6 at both ends of the inner diameter, wherein the shaft body provided at the center of the target rotating wheel 5 passes through the inner hole of the large bearing 6 and is axially fixed by using a large gear 7, and is assembled with the bearing seat 4 to form a local feature about the target rotating wheel 5, and is assembled at the center of the support 1; and the target wheel motor gear 9 is assembled on the output power shaft of the target wheel stepper motor 8, and the installation position is adjusted to be connected in meshing with the large gear 7 to constitute a rotating switching mechanism module about the target.

[0040] A plurality of small bearings 11 are arranged in the inner hole of the target rotating wheel 5, and the shaft body arranged at the center of the filter rotating wheel 10 penetrates through the inner hole of the large bearing 6 and is axially fixed by the pressing ring 12; the fan gear 13 is arranged on the circumferential end surface of the filter rotating wheel 10, and the filter motor gear 15 is arranged on the output power shaft of the filter stepping motor 14, and the installation position is adjusted so that the fan gear 13 and the filter motor gear 15 are connected in meshing to form a rotating switching mechanism module for the filter.

[0041] The stepping motor driving chip I 25 and the stepping motor driving chip II 26 are both MS35775, which is a two-phase, pin ENN is a motor driving enable, when ENN is low, the output drive is opened, and when it is high, the output is closed; the pin DIR is a direction control, the high and low level controls the motor to rotate forward or reverse, and the pin STEP is a motor stepping input, each pulse controls the motor to rotate one step.

[0042] Further, after the infrared optical transfer function measuring instrument system is powered on or receives a zero return command, the single-chip microcomputer 24 controls the target wheel stepping motor 8 to rotate in a fixed direction through the driving chip, and the single-chip microcomputer detects the I / O signal connected with the photoelectric switch I 20. Once the switch vane I 21 blocks the photoelectric switch I 20, the output signal of the photoelectric switch I 20 changes from 1 to 0, and the single-chip microcomputer detects the signal and immediately stops the rotation of the target wheel stepping motor 8, and simultaneously sets the current position as the initial position VO. The same method is applied to the initial zero return of the filter.

[0043] When the product is debugged, the stepping numbers of each V-shaped groove on the target rotating wheel and the filter rotating wheel relative to the zero position are measured (as shown in the following table). Among them, VO represents the initial position, and Vn represents the number of steps that need to be rotated to rotate the nth V-shaped groove from the initial position.

[0044] The stepping number of each gear of the target wheel relative to the initial position:

[0045] V-groove V0 V1 V2 V3 V4 V5 V6 V7 V8 Steps 0 16 182 349 516 683 850 1017 1184 V-groove V9 V10 V11 V12 V13 V14 V15 V16 Steps 1351 1518 1685 1852 2019 2186 2353 2520

[0046] The stepping number of each gear of the filter relative to the initial position:

[0047] V-groove V0 V1 V2 V3 V4 Steps 0 8 558 1108 1658

[0048] As shown in Figure 4 and Figure 6 , in particular, in combination with the above table, when the target rotating wheel is in the mth gear, the single-chip microcomputer receives a command that the rotating wheel needs to rotate to the nth gear, and the single-chip microcomputer reads the values of Vm and Vn from the data table.

[0049] If n>m, the single-chip computer sets the I / O pin connected with DIR1 signal to 1, sets the I / O port connected with ENN1 signal to 0, and generates 200Hz pulse signal at the I / O port connected with STEP1 signal to drive the stepping motor to rotate; the single-chip computer counts the pulses as Sn at the same time; when Sn≥(Vn-Vm), the single-chip computer sets the I / O port connected with ENN1 signal to 1, and the stepping motor stops rotating.

[0050] If n<m, the single-chip computer sets the I / O pin connected with DIR1 signal to 0, sets the I / O port connected with ENN1 signal to 0, and generates 200Hz pulse signal at the I / O port connected with STEP1 signal to drive the stepping motor to rotate; the single-chip computer counts the pulses as Sn at the same time; when Sn≥(Vm-Vn), the single-chip computer sets the I / O port connected with ENN1 signal to 1, and the stepping motor stops rotating.

[0051] If n=m, no action is taken.

[0052] The filter rotating control is the same as the target rotating control, except that the control of ENN1, DIR1 and STEP1 signals is changed to ENN2, DIR2 and STEP2.

[0053] Obviously, the above-mentioned embodiments are only examples for the purpose of clarity, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. It is not necessary or possible to exhaust all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. An infrared optical transfer function measuring instrument target wheel switching positioning device, the switching positioning device is applied to the target wheel in the target generator of the infrared optical transfer function measuring instrument, and the rotation switching and accurate positioning of the target (2) and the filter (3) therein are realized, characterized in that, The switching positioning device comprises a support (1), a rotating switching mechanism, a positioning mechanism and a control circuit module. The rotating switching mechanism and the positioning mechanism are assembled in the positioning structure of the support (1). The rotating switching mechanism comprises a bearing seat (4), a target rotating wheel (5), a large bearing (6), a large gear (7), a target wheel stepping motor (8), a target wheel motor gear (9), a filter rotating wheel (10), a small bearing (11), a pressing ring (12), a fan gear (13), a filter stepping motor (14) and a filter motor gear (15). The target rotating wheel (5) is uniformly provided with sixteen mounting holes in the circumferential direction on the surface feature, and the target (2) is fixed in the corresponding mounting hole. The outer cylindrical end surface of the target rotating wheel (5) is uniformly designed with sixteen V-shaped positioning grooves. The filter rotating wheel (10) is designed with three mounting holes on one side, and the outer cylindrical end surface of the filter rotating wheel (10) is provided with three V-shaped positioning grooves. The filter (3) is fixed in the mounting hole. The positioning mechanism realizes accurate positioning of the target (2) and the filter (3) in the specified position. The positioning mechanism comprises two groups of top bead components, a photoelectric switch I (20), a switch baffle I (21), a photoelectric switch II (22) and a switch baffle II (23). The top bead component comprises a top column seat (16), a steel ball (17), a compression spring (18) and an adjusting screw sleeve (19). The top bead component takes the top column seat (16) as the base body and is assembled on one side of the positioning abutting surface of the support (1). The assembled steel ball (17), compression spring (18) and adjusting screw sleeve (19) are arranged on the center line in the top column seat (16). The center line in the top column seat (16) is perpendicular to the normal line of the circle where the outer cylindrical end surface of the filter rotating wheel (10) is located. The compression spring (18) is arranged between the steel ball (17) and the adjusting screw sleeve (19). The adjusting screw sleeve (19) is rotated to adjust the pressure of the compression spring (18), so that the steel ball (17) has the freedom to move up and down along the center line. The photoelectric switch I (20) and the photoelectric switch II (22) are arranged on one side of the target wheel stepping motor (8) and the filter stepping motor (14) respectively. The photoelectric switch I (20) and the photoelectric switch II (22) are connected with the I / O port of the single-chip microcomputer (24) through signal communication. The switch baffle I (21) is arranged on the target rotating wheel (5), and the switch baffle II (23) is arranged on the filter rotating wheel (10). The control circuit module comprises a single-chip microcomputer (24), a step motor driving chip I (25) and a step motor driving chip II (26), wherein the single-chip microcomputer (24) is connected with the step motor driving chip I (25) and the step motor driving chip II (26) through chip pins and communication signals of enable, direction and pulse signals; and the step motor driving chip I (25) and the step motor driving chip II (26) are both MS35775, which is a two-phase, pin ENN is motor driving enable, when ENN is low, the output drive is opened, and when ENN is high, the output is closed; pin DIR is direction control, high and low level control motor forward or reverse rotation, pin STEP is motor step input, each pulse controls the motor to rotate one step.

2. The target wheel change positioning device of claim 1, wherein: The bearing seat (4) is assembled with a large bearing (6) at both ends of the inner diameter, wherein the shaft body provided at the center of the target rotating wheel (5) penetrates the inner hole of the large bearing (6), and is axially fixed by using a large gear (7) to form a local feature about the target rotating wheel (5) with the bearing seat (4), and is assembled at the center of the support (1); and the target wheel motor gear (9) is assembled on the output power shaft of the target wheel stepping motor (8), and the installation position is adjusted to be connected in meshing with the large gear (7) to form a rotating switching mechanism module about the target.

3. The target wheel indexing positioning apparatus of claim 1, wherein: A plurality of small bearings (11) are provided in the inner hole of the target rotating wheel (5), and the shaft body provided at the center of the filter rotating wheel (10) penetrates the inner hole of the large bearing (6) and is axially fixed by a compression ring (12); the fan gear (13) is provided on the circumferential end face of the filter rotating wheel (10), and the filter motor gear (15) is assembled on the output power shaft of the filter stepping motor (14), and the installation position is adjusted to be connected in meshing with the fan gear (13) to form a rotating switching mechanism module about the filter.

4. A control method of target wheel switching positioning, the control method is driven based on a control circuit module, and relies on the target wheel switching positioning device of any one of claims 1-3, characterized in that, The control steps include the following: S1: After the device is powered on, the single-chip microcomputer (24) generates an enable signal, a direction signal and a pulse signal, and sends them into the step motor driving chip I (25) to drive the target wheel stepping motor (8) to rotate in a direction, thereby driving the target rotating wheel (5) to rotate; S2: The single-chip microcomputer (24) detects the signal output by the photoelectric switch I (21) after each pulse, and immediately turns off the enable signal to stop the target wheel stepping motor (8) from rotating when the signal is triggered, and the target wheel zero reset action is completed; S3: After the target wheel zero reset action is completed, the single-chip microcomputer (24) controls the step motor driving chip II (26) to complete the filter zero reset action, and the process is the same as the target wheel zero reset action; S4: After the target wheel zero reset and the filter zero reset, the single-chip microcomputer (24) can receive target and filter selection instructions; S5: After the single-chip microcomputer (24) receives the target or filter selection instruction, the step number between the current position and the target target or filter position is calculated by looking up the table, the product enable and pulse signals are controlled, and the target wheel stepping motor (25) is rotated; S6: single-chip microcomputer (24) counts each driving pulse, and disconnects the enable signal and stops the rotation of the stepping motor when the number of pulses reaches the calculated number of steps, at which time the steel ball (17) of the top bead component also falls into the V-shaped groove for accurate positioning.

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