CN112815839B - Method for realizing mechanical zero detection and adjustment by utilizing linear ccd - Google Patents
Method for realizing mechanical zero detection and adjustment by utilizing linear ccd Download PDFInfo
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- CN112815839B CN112815839B CN202011631612.2A CN202011631612A CN112815839B CN 112815839 B CN112815839 B CN 112815839B CN 202011631612 A CN202011631612 A CN 202011631612A CN 112815839 B CN112815839 B CN 112815839B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 239000004579 marble Substances 0.000 claims abstract description 33
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 31
- 238000012544 monitoring process Methods 0.000 claims description 45
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000013461 design Methods 0.000 abstract description 10
- 238000005286 illumination Methods 0.000 abstract description 9
- 238000012545 processing Methods 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000011900 installation process Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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Abstract
The invention discloses a method for realizing mechanical zero position detection and adjustment by utilizing linear ccd, which adopts a device comprising a marble platform, a servo motor, a speed reducer, a speed reducing bracket, a rotating main shaft, a brake bracket, a coding disc, a bottom plate, a portal frame, a parallel light source, a linear ccd and a tool to be tested; the invention designs linear ccd to detect the mechanical zero position, does not need to carry out extra step of levelness detection on a marble platform for processing before detection, can ensure that the illumination direction of monochromatic light emitted by a parallel light source is parallel to the marble platform through mechanical assembly, can avoid mounting a testing mechanism such as a level meter and the like, and also does not need to design a platform leveling mechanism, thereby greatly saving the design cost of the whole device, and simultaneously avoiding the interference on the zero setting result of the whole mechanism caused by the deviation between the processing platform and the absolute horizontal position in the traditional mechanical design method.
Description
Technical Field
The invention relates to the field of aerospace, in particular to a method for realizing mechanical zero detection and adjustment by utilizing linear ccd.
Background
The existing zero-setting mechanism is used for zero adjustment of a rotatable mechanism, and the adjusted mechanism is used for driving a subsequent device to rotate, so that the deviation between the mechanical zero position and the electrical zero position of the mechanism needs to be ensured within a certain precision range, and the zero-setting mechanism needs to be set. The mechanism to be zeroed is provided with two positioning pin holes, and the two positioning pin holes are required to be adjusted to be completely horizontal by taking the horizontal positions of the two pins as mechanical zero positions. The device has servo motor and speed reducer, can drive and treat that zero setting frock is rotatory, and the design has code disc, linear ccd to gather information, uploads to the host computer and lets the host computer carry out analysis processes to the information, and control servo motor opens and stops, makes zero setting frock rotatory to mechanical zero position.
Traditional mechanical zero setting device need guarantee the processing platform levelness before zero setting device starts, generally select spirit level or other sensing measuring tool to carry out the levelness and detect for use, detection device is expensive, measuring procedure is loaded down with trivial details, if the levelness is not conform to the requirement, still need adjustment mechanism to adjust the platform levelness, the operation degree of difficulty and the loaded down with trivial details degree of whole zero setting have been increased, it can not need carry out the levelness to processing platform to utilize linear ccd to carry out zero setting detection, as long as when the assembly, perpendicular to processing platform when guaranteeing the portal frame installation, and simultaneously, coaxial light source utilizes the angle steel when the installation, closely laminate with the portal frame, just can guarantee to make the light that coaxial light source sent be on a parallel with the marble platform. Even if the marble platform is not level, the zero detection result cannot be interfered. The zero setting step is simple.
When the zero position of the mechanism to be measured is detected, the traditional mechanical zero setting method mostly depends on a sensor to measure the relative height of a pin hole, the method usually needs to be designed with a high-precision sensor, meanwhile, the installation steps are complex, the high-precision sensor is high in price, the sensor needs to be installed on the whole mechanism, the precision of each part of the whole device is greatly required, inevitable matching errors exist in the mechanical matching process, the final measurement result is influenced, and the mechanical zero position cannot be adjusted to a position with enough precision.
Disclosure of Invention
The invention aims to solve the problems of complex mechanical structure, complex installation steps and high precision requirements on various parts of the existing zero setting device, provides a method for realizing mechanical zero position detection and adjustment by utilizing linear ccd, realizes the precise adjustment of the mechanical zero position of a device to be detected, has high automation degree, and reduces the influence on the final zero setting result caused by machining errors and matching errors in the machining and installation processes as much as possible.
The invention realizes the purpose through the following technical scheme: a method for realizing mechanical zero position detection and adjustment by utilizing linear ccd comprises a marble platform, a servo motor, a speed reducer, a speed reducing support, a rotating main shaft, a brake support, a coding disc, a bottom plate, a portal frame, a parallel light source, linear ccd and a tool to be detected, wherein two pins are arranged on the tool to be detected, the two pins are symmetrically arranged relative to the axis of the tool to be detected, and the tool to be detected is fixed on the marble platform; the servo motor is fixed on a shell of the speed reducer, an input shaft of the servo motor is connected with an input end of the speed reducer, an output end of the speed reducer is connected with one end of the rotating main shaft, and the other end of the rotating main shaft sequentially penetrates through the brake and the coding disc and then is connected with a tool to be tested; the speed reducer is installed on the bottom plate through the speed reducing support, the brake and the coding disc are installed on the bottom plate through the brake support, the bottom plate is fixed on the marble platform, the portal frame is fixed on the marble platform and is perpendicular to the marble platform, a parallel light source is installed on one vertical support of the portal frame, a linear CCD is installed on the other vertical support of the portal frame, the parallel light source is right opposite to the linear CCD, and light rays emitted by the parallel light source vertically irradiate the linear CCD; the connecting end of the rotating main shaft and the tool to be tested is arranged in the shape of three clamping shafts, three fixing holes which are in one-to-one correspondence with the positions of the three clamping shafts are formed in the tool to be tested, and the three clamping shafts pass right below the portal frame; the servo motor, the speed reducer, the rotating main shaft, the brake, the coding disc and the axis of the tool to be tested are positioned on the same straight line, the pin on the tool to be tested is positioned below the portal frame, light rays emitted by the parallel light source vertically irradiate the linear CCD and pass through the two pins and the three clamping shafts, and the diameter of the pin is larger than that of the clamping shafts; the method comprises the following steps:
the method comprises the following steps: the whole equipment is installed according to the adopted device, when the tool to be tested is not installed, the servo motor is started, the servo motor drives the rotating main shaft to rotate through the speed reducer, the parallel light source is started simultaneously, light rays emitted by the parallel light source pass through the three clamping shafts on the rotating main shaft and then irradiate the linear ccd, the number of monitoring points which are shielded when the linear ccd is shielded at most is recorded, and the number is recorded as the total number of the monitoring points which can be shielded by the three clamping shafts;
step two: fixing a tool to be tested, which needs to be mechanically zeroed, on a marble platform;
step three: the host controls a servo motor to start, and the servo motor drives the tool to be tested to slowly rotate through a speed reducer and a rotating main shaft;
step four: enabling the tool to be tested to slowly rotate by an angle, and simultaneously starting a parallel light source, wherein the parallel light source shoots parallel monochromatic light on the linear CCD after passing through three clamping shafts and pins of the rotating main shaft; however, as the three card shafts and the pins can shield parallel monochromatic light, a shadow part smaller than five can be presented in the linear ccd, the part occupied by the shadow part can not receive the parallel monochromatic light, the monitoring points positioned in the shadow part in the linear ccd can not generate charge signals, when five shadow parts are generated, the number of monitoring points shielded by all the shadow parts is measured, the total number of the monitoring points shielded by the three card shafts recorded in the step one is subtracted, the number of the monitoring points shielded by the two shadow parts with the largest area is obtained, the average value of the number of the two monitoring points is taken, and the host records the average value as the number of the monitoring points shielded by each pin;
step five: the host controls the servo motor to continue rotating, so that the two largest shadow parts on the tool to be tested on the linear ccd are gradually overlapped;
step six: until the area of the whole shadow part formed by the two maximum shadow parts on the linear ccd is gradually reduced until the number of monitoring points overlapped and covered reaches the number of monitoring points which can be shielded by each pin recorded in the third step, the information of the linear ccd is transmitted to the host;
step seven: the main machine sends a control signal according to a signal sent by the linear ccd, controls the brake to work, and enables the servo motor to stop moving, the whole mechanism stops rotating immediately under the action of the brake, and meanwhile, the two pin positions stop at positions parallel to the marble platform, and at the moment, the zero setting of the tool to be tested is successful;
step eight: and (5) taking down the to-be-tested tool after zero setting, installing the next to-be-tested tool on the marble platform, and repeating the processes from the first step to the sixth step until zero setting of all the to-be-tested tools is completed.
Furthermore, one side surface of the brake bracket is fixed with the brake, and the other side surface of the brake bracket is fixed with the code disc. The servo motor can provide rotating speed and torque for the rotation of the whole mechanism, the speed reducer can reduce the rotating speed of the whole mechanism, the rotation of the mechanism is more controllable, the brake can enable the servo motor to stop in time when the tool to be tested reaches a mechanical zero position, and errors caused by inertia are reduced.
Further, the rotating main shaft is connected with the tool to be tested through a universal joint. The universal joint is sleeved with a torsional spring, so that the transmission backlash between the input end and the output end of the universal joint can be eliminated. The universal joint can drive the tool to be tested to rotate even if the axis of the tool to be tested and the rotating main shaft are not on the same straight line. When the universal joint is arranged, the three clamping shafts are arranged at the joint of the universal joint and the tool to be tested.
Furthermore, the coding disc is arranged on a brake bracket of the fixed brake, can convert the rotation displacement into a series of digital pulse signals, and measures the rotation angle of the current driving device, so that the control system can accurately control the rotation angle. Meanwhile, the encoder can upload the rotary displacement information to the host computer, so that the host computer can record the rotation angle.
Further, the light emitted by the parallel light source is parallel monochromatic light. After the whole mechanism is installed, the parallel light source emits parallel monochromatic light to irradiate on the pin.
Furthermore, 128 monitoring points are distributed on the linear ccd, and the monitoring points, which can receive illumination, of the linear ccd can convert optical signals into electric charges.
The pins are able to block parallel light and make a shadow on linear ccd without illumination. The monitoring points in the shadow part do not generate charges, and whether the shadows formed by the two pins are overlapped or not can be judged according to the number of the monitoring points without the charges.
Further, be provided with the locating piece on the marble platform, the frock that awaits measuring passes through the locating piece and realizes the location on the marble platform.
Furthermore, the fixing hole and the two pins are arranged in a staggered mode on the tool to be tested, and shadow parts formed by the three clamping shafts do not coincide when the two pins are arranged in parallel. The staggered arrangement can ensure that the clamping shaft of the rotating main shaft is staggered with the shadow part generated by the pin, and the mutual interference is prevented from generating influence.
The invention utilizes a coaxial light source and linear ccd to detect the mechanical zero position of the whole device, and the detection principle is as follows: the servo motor drives the tool to be tested to rotate through the speed reducer and the rotating main shaft, so that the positioning pin on the tool to be tested reaches a substantially horizontal position, the parallel light source can emit monochromatic light, the monochromatic light is selected because the polychromatic light can possibly generate diffraction phenomenon to influence the final measurement precision, 128 monitoring points are distributed on the linear ccd, and the monitoring points capable of receiving illumination can convert optical signals into electric charges; the pins and three card axes can block parallel light to make a shadow part without illumination on linear ccd, no charge is generated on the monitoring points in the shadow part, because the three clamping shafts are always kept unchanged, the number of the monitoring points on the linear ccd which can be blocked by the three clamping shafts is kept unchanged, the number of the monitoring points which can be blocked by the three clamping shafts is measured before zero setting is started, then the number of the monitoring points which can be blocked by a single pin is measured, after zero setting is started, when the number of the monitoring points without electric charge generation is equal to the number of the monitoring points which can be blocked by three clamping shafts and one pin, at the moment, regarding as the coincidence of two pin shadow parts, regarding as pin mounted position and being on a parallel with the illumination direction of parallel light source emission monochromatic light, because can guarantee according to mechanical cooperation that the illumination direction of monochromatic light is parallel with the marble platform again, so can regard as the frock zero setting that awaits measuring to end.
The invention has the beneficial effects that:
1. the whole zero setting scheme of the invention is completely controlled by a computer, thereby avoiding zero setting failure caused by misoperation, saving labor cost and ensuring zero setting precision.
2. The invention designs linear ccd to detect the mechanical zero position, does not need to carry out extra step of levelness detection on a marble platform for processing before detection, can ensure that the illumination direction of monochromatic light emitted by a parallel light source is parallel to the marble platform through mechanical assembly, can avoid mounting a testing mechanism such as a level meter and the like, and also does not need to design a platform leveling mechanism, thereby greatly saving the design cost of the whole device, and simultaneously avoiding the interference on the zero setting result of the whole mechanism caused by the deviation between the processing platform and the absolute horizontal position in the traditional mechanical design method.
3. The coaxial parallel light source 7 is designed to emit monochromatic parallel light, the interference of the diffraction phenomenon of the monochromatic light to the final shadow imaging can be reduced as much as possible compared with polychromatic light, whether the rotary mechanism reaches the mechanical zero position or not can be accurately judged and analyzed by analyzing the area of the shadow part which does not receive the illumination in the linear ccd, and meanwhile, the method can reduce the mechanical structure, simplify the installation process, reduce the mechanical structure and reduce the influence of the matching error on the final zero setting result. The detection precision of the test mode is higher than that of the traditional mechanical zero setting method.
4. The invention designs a servo motor, a linear ccd and an encoder, wherein the devices are connected with a host, and the encoder collects a rotation angle message and transmits the rotation angle message to the host. The linear ccd uploads the charge information to the host computer, compares the number of related charges on the host computer, when the number is consistent with the preset number of charges, the servo motor is controlled to send out a stop signal, and the designed speed reducer and the brake enable the device to be tested to be accurately stopped at a mechanical zero position, so that the zero setting precision is improved.
5. The invention has no complex electromechanical equipment, simple structure, no need of designing and installing sensors with high price and troublesome installation, simplifying the manufacturing and installing steps of the whole device and greatly reducing the manufacturing cost of the device. The overall structure control flow is simple and effective, the automation degree is high, the zero setting precision is high, and the labor cost and the manufacturing cost are saved on the premise that the zero setting requirement of the precision equipment can be met.
Drawings
Fig. 1 is a schematic diagram of the overall structure of an apparatus used in the method for implementing mechanical zero detection and adjustment by using linear ccd according to the present invention.
Fig. 2 is a schematic view of the overall structure of the drive mechanism of the present invention.
Fig. 3 is a schematic structural diagram of the tool to be tested according to the present invention.
Fig. 4 is a schematic structural diagram of the linear ccd and the parallel light source of the present invention installed on a gantry.
In the figure, 1-marble platform, 2-servo motor, 3-speed reducer, 4-brake, 5-coding disc, 6-portal frame, 7-parallel light source, 8-linear ccd, 9-tool to be tested, 10-fixing angle steel, 11-pin, 12-speed reducing bracket, 13-braking bracket, 14-bottom plate and 15-fixing hole.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1 to 4, a method for realizing mechanical zero position detection and adjustment by using a linear ccd includes a marble platform 1, a servo motor 2, a speed reducer 3, a speed reducing support 12, a rotating main shaft, a brake 4, a brake support 13, an encoding disc 5, a bottom plate 14, a portal frame 6, a parallel light source 7, a linear ccd8 and a tool 9 to be measured, wherein the servo motor 2, the speed reducer 3, the speed reducing support 12, the rotating main shaft, the brake 4, the brake support 13, the encoding disc 5 and the bottom plate 14 form a driving mechanism of the whole device, the tool 9 to be measured is provided with two pins 11, the two pins 11 are symmetrically arranged about the axis of the tool 9 to be measured, and the tool 9 to be measured is fixed on the marble platform 1; the servo motor 2 is fixed on a shell of the speed reducer 3, an input shaft of the servo motor 2 is connected with an input end of the speed reducer 3, an output end of the speed reducer 3 is connected with one end of a rotating main shaft, and the other end of the rotating main shaft sequentially penetrates through the brake 4 and the coding disc 5 and then is connected with a tool 9 to be tested; the speed reducer 3 is installed on a bottom plate 14 through a speed reducing support 12, the brake 4 and the coding disc 5 are installed on the bottom plate 14 through a brake support 13, the bottom plate 14 is fixed on the marble platform 1, the portal frame 6 is perpendicular to the marble platform 1, one vertical support of the portal frame 6 is provided with a parallel light source 7, the other vertical support of the portal frame 6 is provided with a linear ccd8, the linear ccd8 is fixed through a fixing angle steel 10, the parallel light source 7 is right opposite to the linear ccd8, and light emitted by the parallel light source 7 vertically irradiates the linear ccd 8; the connecting end of the rotating main shaft and the tool to be tested 9 is arranged in the shape of three clamping shafts, three fixing holes 15 which are in one-to-one correspondence with the three clamping shafts are arranged on the tool to be tested 9, and the three clamping shafts pass right below the portal frame 6; the servo motor 2, the speed reducer 3, the rotating main shaft, the brake 4, the coding disc 5 and the tool to be tested 9 are arranged on the same straight line, the pin 11 on the tool to be tested 9 is positioned below the portal frame 6, light emitted by the parallel light source 7 vertically irradiates the linear ccd8 and passes through the two pins 11 and the three clamping shafts, and the diameter of the pin 11 is larger than that of the clamping shafts; the method comprises the following steps:
the method comprises the following steps: the whole equipment is installed according to the adopted device, when the tool to be detected 9 is not installed, the servo motor 2 is started, the servo motor 2 drives the rotating main shaft to rotate through the speed reducer 3, the parallel light source 7 is started simultaneously, light rays emitted by the parallel light source 7 pass through the three clamping shafts on the rotating main shaft and then irradiate the linear ccd8, and the number of shielded monitoring points on the linear ccd8 when the shielding is the most is recorded and recorded as the total number of the monitoring points which can be shielded by the three clamping shafts;
step two: fixing a tool to be tested 9 needing mechanical zero setting on the marble platform 1;
step three: the host controls the servo motor 2 to start, and the servo motor 2 drives the tool to be tested 9 to slowly rotate through the speed reducer 3 and the rotating main shaft;
step four: enabling the tool 9 to be tested to slowly rotate by an angle, starting the parallel light source 7, and enabling the parallel light source 7 to shoot parallel monochromatic light on the linear ccd8 after passing through the three clamping shafts of the rotating main shaft and the pins 11; however, as the three card shafts and the pins 11 can shield parallel monochromatic light, less than five shadow parts can be presented in the linear ccd8, the part occupied by the shadow parts cannot accept the parallel monochromatic light, the monitoring points positioned in the shadow parts in the linear ccd8 cannot generate charge signals, when five shadow parts are generated, the number of monitoring points shielded by all the shadow parts is measured, the total number of the monitoring points shielded by the three card shafts recorded in the step one is subtracted, the number of the monitoring points shielded by the two shadow parts with the largest area is obtained, the average value of the two monitoring points is taken, and the host records the average value as the number of the monitoring points shielded by each pin 11;
step five: the host controls the servo motor 2 to continue rotating, so that the two maximum shadow parts on the to-be-tested tooling 9 on the linear ccd8 are gradually overlapped;
step six: until the area of the whole shadow part formed by the two maximum shadow parts on the linear ccd8 is gradually reduced until the number of monitoring points overlapped and covered reaches the number of monitoring points which can be shielded by each pin 11 recorded in the third step, the information of the linear ccd8 is transmitted to the host computer;
step seven: the host computer sends out control signal according to the signal that linear ccd8 sent, and control stopper 4 work makes servo motor 2 stop motion, and whole mechanism stops the rotation immediately under the effect of stopper 4 this moment, and two pins 11 positions stop on the position parallel with marble platform 1 simultaneously, and at this moment, zero setting of frock 9 that awaits measuring is successful.
Step eight: and (5) taking down the to-be-tested tool 9 which is subjected to zero setting, installing the next to-be-tested tool 9 on the marble platform 1, and repeating the processes from the first step to the sixth step until the zero setting work of all the to-be-tested tools 9 is completed.
One side of the brake bracket 13 is fixed with the brake 4, and the other side of the brake bracket 13 is fixed with the code disc 5.
The rotating main shaft is connected with the tool 9 to be tested through a universal joint.
The coding disc 5 is installed on a brake bracket 13 of the fixed brake 4, can convert the rotation displacement into a series of digital pulse signals, and measures the rotation angle of the current driving device, so that the control system can accurately control the rotation angle.
The light emitted by the parallel light source 7 is parallel monochromatic light. 128 monitoring points are distributed on the linear ccd 8.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, so long as the technical solutions can be realized on the basis of the above embodiments without creative efforts, which should be considered to fall within the protection scope of the patent of the present invention.
Claims (6)
1. A method for realizing mechanical zero detection and adjustment by utilizing linear ccd is characterized in that: the device comprises a marble platform (1), a servo motor (2), a speed reducer (3), a speed reducing support (12), a rotating main shaft, a brake (4), a braking support (13), a coding disc (5), a bottom plate (14), a portal frame (6), a parallel light source (7), a linear ccd (8) and a tool to be tested (9), wherein two pins (11) are arranged on the tool to be tested (9), the two pins (11) are symmetrically arranged about the axis of the tool to be tested (9), and the tool to be tested (9) is fixed on the marble platform (1); the servo motor (2) is fixed on a shell of the speed reducer (3), an input shaft of the servo motor (2) is connected with an input end of the speed reducer (3), an output end of the speed reducer (3) is connected with one end of a rotating main shaft, and the other end of the rotating main shaft sequentially penetrates through the brake (4) and the coding disc (5) and then is connected with a tool (9) to be tested; the speed reducer (3) is installed on a bottom plate (14) through a speed reducing support (12), the brake (4) and the coding disc (5) are installed on the bottom plate (14) through a brake support (13), the bottom plate (14) is fixed on the marble platform (1), the portal frame (6) is perpendicular to the marble platform (1), one vertical support of the portal frame (6) is provided with a parallel light source (7), the other vertical support of the portal frame (6) is provided with a linear ccd (8), the parallel light source (7) is opposite to the linear ccd (8), and light rays emitted by the parallel light source (7) vertically irradiate the linear ccd (8); the connecting end of the rotating main shaft and the tool to be tested (9) is arranged in the shape of three clamping shafts, three fixing holes (15) which correspond to the three clamping shafts one by one are formed in the tool to be tested (9), and the three clamping shafts pass right below the portal frame (6); the servo motor (2), the speed reducer (3), the rotary main shaft, the brake (4), the coding disc (5) and the tool to be tested (9) are arranged on the same straight line, the pin (11) on the tool to be tested (9) is positioned below the portal frame (6), light emitted by the parallel light source (7) vertically irradiates the linear ccd (8) and passes through the two pins (11) and the three clamping shafts, and the diameter of the pin (11) is larger than that of the clamping shafts; the method comprises the following steps:
the method comprises the following steps: the whole equipment is installed according to the adopted device, when a tool (9) to be detected is not installed, the servo motor (2) is started, the servo motor (2) drives the rotating main shaft to rotate through the speed reducer (3), the parallel light source (7) is started at the same time, light rays emitted by the parallel light source (7) irradiate the linear ccd (8) after passing through the three clamping shafts on the rotating main shaft, the number of shielded monitoring points on the linear ccd (8) when the monitoring points are shielded most is recorded, and the number is recorded as the total number of the monitoring points which can be shielded by the three clamping shafts;
step two: fixing a tool (9) to be tested, which needs to be mechanically zeroed, on the marble platform (1);
step three: the host controls the servo motor (2) to start, and the servo motor (2) drives the tool (9) to be tested to slowly rotate through the speed reducer (3) and the rotating main shaft;
step four: enabling the tool (9) to be tested to slowly rotate for an angle, simultaneously starting the parallel light source (7), and enabling the parallel light source (7) to shoot parallel monochromatic light on the linear ccd (8) after passing through the three clamping shafts and the pins (11) of the rotating main shaft; however, as the three clamping shafts and the pins (11) can shield parallel monochromatic light, less than five shadow parts can be presented in the linear ccd (8), the part occupied by the shadow parts cannot receive the parallel monochromatic light, the monitoring points positioned in the shadow parts in the linear ccd (8) cannot generate charge signals, when the five shadow parts are generated, the number of the monitoring points shielded by all the shadow parts is measured, the total number of the monitoring points shielded by the three clamping shafts recorded in the step one can be subtracted, the number of the monitoring points shielded by the two shadow parts with the largest area is obtained, the average value of the number of the two monitoring points is taken, and the host records the average value as the number of the monitoring points shielded by each pin (11);
step five: the host controls the servo motor (2) to continue rotating, so that the two largest shadow parts on the linear ccd (8) on the tool to be tested (9) are gradually overlapped;
step six: until the area of the whole shadow part formed by the two maximum shadow parts on the linear ccd (8) is gradually reduced until the number of monitoring points overlapped and covered reaches the number of monitoring points which can be shielded by each pin (11) recorded in the step three, the information of the linear ccd (8) is transmitted to the host;
step seven: the main machine sends a control signal according to a signal sent by the linear ccd (8), controls the brake (4) to work, and enables the servo motor (2) to stop moving, at the moment, the whole mechanism stops rotating immediately under the action of the brake (4), and meanwhile, the positions of the two pins (11) stop at the position parallel to the marble platform (1), and at the moment, the zero setting of the tool (9) to be tested is successful;
step eight: and (5) taking down the to-be-tested tool (9) which is subjected to zero setting, installing the next to-be-tested tool (9) on the marble platform (1), and repeating the processes from the first step to the sixth step until the zero setting work of all the to-be-tested tools (9) is completed.
2. The method for implementing mechanical null detection adjustment by linear ccd as claimed in claim 1, wherein: one side surface of the brake bracket (13) is fixed with the brake (4), and the other side surface of the brake bracket (13) is fixed with the coding disc (5).
3. The method for implementing mechanical null detection adjustment by linear ccd as claimed in claim 1, wherein: the rotating main shaft is connected with the tool (9) to be tested through a universal joint.
4. The method for implementing mechanical null detection adjustment by linear ccd as claimed in claim 1, wherein: the coding disc (5) is arranged on a brake bracket (13) of the fixed brake (4) and can convert the rotation displacement into a series of digital pulse signals, and the rotation angle of the current driving device is measured, so that the control system can accurately control the rotation angle.
5. The method for implementing mechanical null detection adjustment by linear ccd as claimed in claim 1, wherein: the light emitted by the parallel light source (7) is parallel monochromatic light.
6. The method for implementing mechanical null detection adjustment by linear ccd as claimed in claim 1, wherein: 128 monitoring points are distributed on the linear ccd (8).
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