Vehicle body chassis hole coordinate position measuring device and method

Abstract

The invention discloses an automobile body chassis hole coordinate position measuring device and method, and relates to the technical field of automobile development, and the device comprises a measuring machine which is provided with a measuring head module with a horizontal moving function and a vertical moving function; the measuring machine is further provided with a laser transmitter in signal connection with the measuring head module, and the transmitting end of the laser transmitter is vertically downward. The measuring machine is further provided with a contact jewel ball wrapping the transmitting end of the laser transmitter. The measuring machine is further provided with an image processing module which is used for image acquisition and image analysis. And the controller is in signal connection with the measuring machine. According to the method, the position of the central point of the hole feature of the automobile workpiece is corrected through the light spot image formed by laser projection, so that hole feature detection is performed based on the corrected condition, and the working efficiency is effectively improved on the premise of ensuring the detection safety.

Description

Technical Field

[0001] The invention relates to the technical field of automobile development, and in particular to a device and method for measuring the coordinate position of a hole in a chassis of a vehicle body. Background Art

[0002] During the process of automobile trial production and development, the prototype stamping and welding parts such as the body chassis need to be inspected by three-dimensional coordinates. The three-dimensional coordinate measuring machine creates and imports the theoretical hole center position and vector direction information, and then the machine tool controller guides the probe to complete the measurement. If there is a large deviation in the spatial position coordinates of the center point of the manufactured part hole and other characteristic elements, the measuring machine cannot automatically identify the coordinates of the actual spatial position of the hole and other characteristic elements. The measuring machine's probe will only execute the measurement command according to the previously created theoretical spatial position coordinate value. In this case, there is a high probability that the probe will directly hit the workpiece being measured and cause the measuring equipment to stop and alarm, affecting the quality inspection efficiency of the workpiece. At the same time, long-term and frequent collisions will also cause premature damage to the internal mechanical structure of the probe module of the measuring machine, causing certain economic losses.

[0003] Therefore, in order to meet actual needs, a vehicle body chassis hole coordinate position measurement technology is provided. Summary of the invention

[0004] In view of the defects existing in the prior art, the purpose of the present invention is to provide a device and method for measuring the coordinate position of holes in a vehicle body chassis. A spot image is formed by laser projection to determine if there is a large deviation between the actual position of the hole and the theoretical position. If the gem ball is contacted and continued automatic measurement is performed, there will be a risk of hitting the needle. At this time, the controller automatically guides the probe module to perform a correction measurement on the theoretical center coordinate value of the hole feature of the automobile workpiece, and automatically detects the hole feature based on the corrected center position coordinate value parameters, thereby effectively improving work efficiency while ensuring detection safety.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] In a first aspect, the present application provides a device for measuring the coordinate position of a hole in a vehicle chassis, the device comprising:

[0007] A measuring machine, wherein the measuring machine is equipped with a probe module having horizontal movement function and vertical movement function;

[0008] The measuring machine is also equipped with a laser transmitter connected to the probe module signal, and the transmitting end of the laser transmitter is vertically downward;

[0009] The measuring machine is also equipped with a contact gemstone ball wrapped around the emitting end of the laser emitter;

[0010] The measuring machine is also equipped with an image processing module, which is used for image acquisition and image analysis;

[0011] A controller connected to the measuring machine signal; wherein,

[0012] The measuring machine is signal-connected to the probe module, the laser transmitter and the image processing module;

[0013] The probe module and the image processing module are arranged side by side and move synchronously, and the laser emitter is located at the lower end of a probe arranged at the bottom of the combination of the probe module and the image processing module;

[0014] The circular diameter of the laser spot emitted by the laser emitter onto the upper surface of the target workpiece through the contact gemstone ball is the same as the diameter of the contact gemstone ball.

[0015] On the basis of the above technical solution, the controller is also used to construct a three-dimensional spatial coordinate system of the workpiece and obtain the theoretical coordinate value of the hole center of the hole feature of the target workpiece.

[0016] On the basis of the above technical solution, the measuring machine is also used to send theoretical movement control instructions to the measuring machine based on the theoretical coordinate value of the hole feature center, control the probe module to drive the contact gem ball to move, so that the contact gem ball is located directly above the theoretical coordinate value of the hole feature center, and the height difference is equal to the preset theoretical safety distance.

[0017] On the basis of the above technical solution, the controller is also used to control the probe module through the measuring machine to drive the contact gem ball to move vertically downward toward the theoretical coordinate value of the hole center at a preset slow descent speed, and control the laser emitter to continuously emit vertically downward laser through the contact gem ball toward the theoretical coordinate value of the hole feature center.

[0018] On the basis of the above technical solution, the controller is also used to control the image processing module through the measuring machine to collect the spot image formed on the target workpiece by the laser emitted by the laser transmitter.

[0019] On the basis of the above technical solution, if the image processing module does not detect the light spot image on the upper surface of the hole feature, the measuring machine is also used for the probe module to drive the contact gem ball to continue to move vertically downward toward the theoretical coordinate value of the center of the hole feature at a preset slow descent speed until the measurement of the center coordinate position of the hole feature of the target workpiece is completed.

[0020] On the basis of the above technical solution, if the image processing module detects the spot image on the upper surface of the hole feature of the target workpiece and feeds it back to the measuring machine, the measuring machine determines that there is a measurement collision risk between the measuring needle and the target workpiece;

[0021] The measuring machine controls the probe module to drive the contact gemstone ball to continue to move vertically downward toward the hole projection surface at a preset slow-down speed, and collects a first curved surface point on the upper surface of the hole feature of the target workpiece;

[0022] The measuring machine is also used to control the probe module to drive the contact gemstone ball to collect the second curved surface point and the third curved surface point on the X surface and the Y surface of the target workpiece respectively, with the coordinate value of the first curved surface point as a relative reference point;

[0023] The measuring machine is also used to obtain a Z-direction deviation value, an X-direction deviation value, and a Y-direction deviation value based on the first curved surface point, the second curved surface point, and the third curved surface point;

[0024] The measuring machine is also used to obtain the hole center correction coordinate value based on the hole feature center theoretical coordinate value, the Z-direction deviation value, the X-direction deviation value and the Y-direction deviation value; wherein,

[0025] The target workpiece is a plate structure, the X surface is perpendicular to the X axis of the three-dimensional space coordinate system of the workpiece, the Y surface is perpendicular to the Y axis of the three-dimensional space coordinate system of the workpiece, and the Z surface is perpendicular to the Z axis of the three-dimensional space coordinate system of the workpiece.

[0026] On the basis of the above technical solution, the upper surface of the hole feature of the target workpiece is the Z surface;

[0027] A group of symmetrical side walls of the target workpiece is a group of X surfaces, and another group of symmetrical side walls is a group of Y surfaces.

[0028] In a second aspect, the present application further provides a measurement method based on the vehicle body chassis hole coordinate position measurement device mentioned in the first aspect, the measurement method comprising the following steps:

[0029] Construct a three-dimensional space coordinate system of the workpiece to obtain the theoretical coordinate value of the hole center of the hole feature of the target workpiece;

[0030] The controller sends a theoretical movement control instruction to the measuring machine based on the theoretical coordinate value of the hole center;

[0031] The measuring machine responds to the movement control instruction and controls the probe module to drive the contact gem ball to move, so that the contact gem ball is located directly above the theoretical coordinate value of the hole center, and the height difference is equal to the preset theoretical safety distance;

[0032] The measuring machine controls the probe module to drive the contact gemstone ball to move vertically downward toward the theoretical coordinate value of the hole center at a preset slow-down speed, and controls the laser emitter to continuously emit vertically downward laser through the contact gemstone ball toward the theoretical center position of the hole feature;

[0033] The measuring machine controls the image processing module to collect a spot image formed on the upper surface of the hole feature of the target workpiece by the laser emitted by the laser transmitter;

[0034] If the image processing module does not detect the spot image on the upper surface of the hole feature of the target workpiece, the measuring machine controls the probe module to drive the contact gem ball to continue to move vertically downward toward the theoretical coordinate value of the center of the hole feature at a preset slow descent speed until the measurement action of the hole coordinate position is completed;

[0035] If the image processing module detects the light spot image on the upper surface of the hole feature of the target workpiece and feeds it back to the measuring machine, the measuring machine determines that there is a measurement collision risk between the measuring needle and the target workpiece;

[0036] The measuring machine controls the probe module to drive the contact gemstone ball to continue to move vertically downward toward the hole projection surface at a preset slow-down speed, and collects a first curved surface point on the Z surface of the target workpiece hole;

[0037] Taking the coordinate value of the first curved surface point as a relative reference point, the measuring machine controls the probe module to drive the contact gemstone ball to collect the second curved surface point and the third curved surface point on the X surface and the Y surface of the target workpiece respectively;

[0038] Based on the first curved surface point, the second curved surface point and the third curved surface point, a Z-direction deviation value, an X-direction deviation value and a Y-direction deviation value are obtained;

[0039] The measuring machine obtains the hole center correction coordinate value based on the hole center theoretical coordinate value, the Z-direction deviation value, the X-direction deviation value and the Y-direction deviation value; wherein,

[0040] The target workpiece is a plate structure, the X surface is perpendicular to the X axis of the three-dimensional space coordinate system of the workpiece, the Y surface is perpendicular to the Y axis of the three-dimensional space coordinate system of the workpiece, and the Z surface is perpendicular to the Z axis of the three-dimensional space coordinate system of the workpiece.

[0041] On the basis of the above technical solution, the upper surface of the target workpiece is the Z surface;

[0042] A group of symmetrical side walls of the target workpiece is a group of X surfaces, and another group of symmetrical side walls is a group of Y surfaces.

[0043] Compared with the prior art, the advantages of the present invention are:

[0044] The present invention uses the spot image formed by laser projection to judge that there is a large deviation between the actual position of the hole and the theoretical position. If the gem ball is contacted and the automatic measurement is continued, there will be a risk of hitting the needle. At this time, the controller of the measuring machine automatically guides the probe module to perform a correction measurement on the theoretical center coordinate value of the hole feature of the automobile workpiece, and automatically detects the hole feature based on the corrected center position coordinate value parameters, effectively improving work efficiency while ensuring detection safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 It is a technical principle diagram of a device for measuring the characteristic coordinate position of a hole in a vehicle chassis according to an embodiment of the present invention;

[0047] Figure 2 It is a technical principle diagram of the vehicle body chassis hole feature coordinate position measuring device when performing coordinate correction according to an embodiment of the present invention;

[0048] In the figure:

[0049] 1. Measuring machine; 2. Probe module; 3. Laser transmitter; 4. Contact gem ball; 5. Image processing module; 6. Controller; 7. Probe; A. Hole feature; B. Hole projection surface; C. Car body chassis workpiece; D. Light spot; E. Theoretical safety distance. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0051] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0052] The embodiments of the present application provide a device and method for measuring the coordinate position of holes in a vehicle body chassis. The device uses a spot image formed by laser projection to determine if there is a large deviation between the actual position of the hole and the theoretical position. If the automatic measurement continues with the contact of the gem ball, there will be a risk of hitting the needle. At this time, the controller of the measuring machine automatically guides the probe module to perform a corrected measurement of the theoretical center coordinate value of the hole feature of the automobile workpiece, and automatically detects the hole feature based on the corrected center position coordinate value parameters, thereby effectively improving work efficiency while ensuring detection safety.

[0053] In order to achieve the above technical effects, the overall idea of ​​this application is as follows:

[0054] A vehicle body chassis hole coordinate position measuring device, the device comprising:

[0055] A measuring machine 1, wherein the measuring machine 1 is equipped with a probe module 2 having horizontal movement function and vertical movement function;

[0056] The measuring machine 1 is also equipped with a laser transmitter 3 connected to the probe module 2 by signal, and the transmitting end of the laser transmitter 3 is vertically downward;

[0057] The measuring machine 1 is also equipped with a contact gemstone ball 4 wrapped around the emitting end of the laser emitter 3;

[0058] The measuring machine 1 is also equipped with an image processing module 5, which is used for image acquisition and image analysis;

[0059] A controller 6 connected to the measuring machine 5 by signal; wherein:

[0060] The measuring machine 1 is connected to the probe module 2, the laser transmitter 3 and the image processing module 5 by signals;

[0061] The probe module 2 and the image processing module 5 are arranged side by side and move synchronously, and the laser emitter 3 is located at the lower end of a probe 7 arranged at the bottom of the combination of the probe module 2 and the image processing module 5;

[0062] The circular diameter of the laser spot emitted by the laser emitter 3 onto the upper surface of the target workpiece through the contact gemstone ball 4 is the same as the diameter of the contact gemstone ball 4 .

[0063] The embodiments of the present application are further described in detail below in conjunction with the accompanying drawings.

[0064] First, see Figures 1-2 As shown, an embodiment of the present application provides a vehicle body chassis hole coordinate position measuring device, the device comprising:

[0065] A measuring machine 1, wherein the measuring machine 1 is equipped with a probe module 2 having horizontal movement function and vertical movement function;

[0066] The measuring machine 1 is also equipped with a laser transmitter 3 connected to the probe module 2 by signal, and the transmitting end of the laser transmitter 3 is vertically downward;

[0067] The measuring machine 1 is also equipped with a contact gemstone ball 4 wrapped around the emitting end of the laser emitter 3;

[0068] The measuring machine 1 is also equipped with an image processing module 5, which is used for image acquisition and image analysis;

[0069] A controller 6 connected to the measuring machine 5 by signal; wherein:

[0070] The measuring machine 1 is connected to the probe module 2, the laser transmitter 3 and the image processing module 5 by signals;

[0071] The probe module 2 and the image processing module 5 are arranged side by side and move synchronously, and the laser emitter 3 is located at the lower end of a probe 7 arranged at the bottom of the combination of the probe module 2 and the image processing module 5;

[0072] The circular diameter of the laser spot emitted by the laser emitter 3 onto the upper surface of the target workpiece through the contact gemstone ball 4 is the same as the diameter of the contact gemstone ball 4 .

[0073] It should be noted that if Figure 1 As shown, it is a technical schematic diagram of the technical solution of the embodiment of the present application, A is the hole feature, B is the hole projection surface, C is the body chassis workpiece, D is the light spot, and E is the theoretical safety distance.

[0074] The above scheme corrects the center point position of the hole feature of the automobile workpiece through the spot image formed by laser projection, and then performs hole feature detection based on the corrected situation, effectively improving work efficiency while ensuring detection safety.

[0075] In the embodiment of the present application, a spot image formed by laser projection is used to determine that there is a large deviation between the actual position of the hole and the theoretical position. Continuing automatic measurement by contacting the gem ball will cause a risk of hitting the needle. At this time, the controller of the measuring machine automatically guides the probe module to perform a corrected measurement of the theoretical center coordinate value of the hole feature of the automobile workpiece, and automatically detects the hole feature based on the corrected center position coordinate value parameters, thereby effectively improving work efficiency while ensuring detection safety.

[0076] Furthermore, the controller 6 is also used to construct a three-dimensional space coordinate system of the workpiece and obtain theoretical coordinate values ​​of the hole center of the hole feature of the target workpiece.

[0077] Furthermore, the measuring machine 1 is also used to send theoretical movement control instructions to the measuring machine 1 based on the theoretical coordinate value of the hole feature center, control the probe module 2 to drive the contact gem ball 4 to move, so that the contact gem ball 4 is located directly above the theoretical coordinate value of the hole feature center, and the height difference is equal to a preset theoretical safety distance.

[0078] Furthermore, the controller 6 is also used to control the probe module 2 through the measuring machine 1 to drive the contact gem ball 4 to move vertically downward toward the theoretical coordinate value of the hole center at a preset slow descent speed, and control the laser emitter 3 to continuously emit vertically downward laser through the contact gem ball 4 toward the theoretical coordinate value of the hole feature center.

[0079] Furthermore, the controller 6 is also used to control the image processing module 5 through the measuring machine 1 to collect a spot image formed on the target workpiece by the laser emitted by the laser emitter 3 .

[0080] Furthermore, if the image processing module 5 does not detect the spot image on the upper surface of the hole feature, the measuring machine 1 is also used for the probe module 2 to drive the contact gem ball 4 to continue to move vertically downward toward the theoretical coordinate value of the center of the hole feature at a preset slow descent speed until the measurement of the center coordinate position of the hole feature of the target workpiece is completed.

[0081] Further, if the image processing module 5 detects the light spot image on the upper surface of the hole feature of the target workpiece and feeds it back to the measuring machine 1, the measuring machine 1 determines that there is a measurement collision risk between the measuring needle 7 and the target workpiece;

[0082] The measuring machine 1 controls the probe module 2 to drive the contact gemstone ball 4 to continue to move vertically downward toward the hole projection surface at a preset slow-down speed, and collects a first curved surface point on the upper surface of the hole feature of the target workpiece;

[0083] The measuring machine 1 is also used to control the probe module 2 to drive the contact gemstone ball 4 to collect the second curved surface point and the third curved surface point on the X surface and the Y surface of the target workpiece respectively, with the coordinate value of the first curved surface point as a relative reference point;

[0084] The measuring machine 1 is also used to obtain a Z-direction deviation value, an X-direction deviation value, and a Y-direction deviation value based on the first curved surface point, the second curved surface point, and the third curved surface point;

[0085] The measuring machine 1 is also used to obtain the hole center correction coordinate value based on the hole feature center theoretical coordinate value, the Z-direction deviation value, the X-direction deviation value and the Y-direction deviation value; wherein,

[0086] The target workpiece is a plate structure, the X surface is perpendicular to the X axis of the three-dimensional space coordinate system of the workpiece, the Y surface is perpendicular to the Y axis of the three-dimensional space coordinate system of the workpiece, and the Z surface is perpendicular to the Z axis of the three-dimensional space coordinate system of the workpiece.

[0087] It should be noted that the collection order of the surface points on the X surface and the Y surface can be interchanged, but when collecting the third surface point, the coordinate value of the first surface point and the coordinate value of the second surface point must be used as relative reference points at the same time.

[0088] Further, the upper surface of the hole feature of the target workpiece is the Z surface;

[0089] A group of symmetrical side walls of the target workpiece is a group of X surfaces, and another group of symmetrical side walls is a group of Y surfaces.

[0090] It should be noted that the hole feature specifically refers to the characteristic elements such as the measured hole of the target workpiece. Based on the technical solution of the embodiment of the present application, the specific actual implementation is as follows:

[0091] When measuring the chassis workpiece, first establish the workpiece three-dimensional space coordinate system A1, define and create the measured hole and other characteristic elements, and obtain the three-dimensional space coordinate value of the theoretical position of the center point O of the hole and other characteristic elements. Here, it is assumed that the theoretical coordinate value of the center point of the hole and other characteristic elements is X, Y, Z;

[0092] The controller 6 sends a command to the probe module 2 of the measuring machine 1, and moves to the center position of the hole and other characteristic elements along the given spatial coordinate position value and the direction of the vector perpendicular to the projection surface of the hole and other characteristic elements in the A1 coordinate system according to the theoretical X, Y, and Z coordinate values ​​of the center point of the hole and other characteristic elements created; The hole characteristic element measurement method is to contact the gem ball 4 along the inner edge of the hole to sample 3 points or more for fitting;

[0093] The contact gemstone ball 4, wherein the ball should be made of a transparent material, laser-penetrable, wear-resistant surface, and high sphericity accuracy, reaches the theoretical Z coordinate position H from the center point of the characteristic element such as the hole, wherein the H value is set as a safe distance perpendicular to the surface direction of the characteristic element such as the hole, which is equal to the distance value of the center point of the contact gemstone ball 4 from the projection surface of the characteristic element such as the hole, the image processing module 5, the probe module 2 and the contact gemstone ball 4 decelerate in the spatial movement in the vector direction of the characteristic element such as the hole, and the laser transmitter 3 passes through the contact gemstone ball 4 to emit a laser perpendicular to the projection surface of the characteristic element such as the hole, forming a circular projection spot on the surface of the body chassis workpiece. At this time, the diameter of the projected circular spot needs to be roughly the same as the diameter of the contact gemstone ball 4 to simulate the size of the contact gemstone ball 4 moving to the edge of the hole, and it is coaxial with the theoretical central axis of the characteristic element such as the hole;

[0094] The image processing module 5 collects the spot signal, and the spot signal collection and analysis adopts the convolution neural network for screening and identification. When the circular spot is projected into the circular area of ​​the characteristic element such as the hole, no spot signal is formed on the workpiece surface. The image processing module 5 is configured next to the probe module 2, and moves synchronously with the contact gem ball 4 to transmit the screening and identification result to the controller 6. The controller 6 judges that there is no risk of collision between the contact gem ball 4 and the workpiece surface at this time according to the result, and issues a command to continue moving according to the spatial coordinate value and vector direction of the theoretical center point of the characteristic element such as the hole. The measuring machine 1 guides the contact gem ball 4 to move to the inner edge of the characteristic element such as the hole according to the command and takes the sample point to complete the measurement action of the characteristic element such as the hole;

[0095] As shown in the attached figure of the specification Figure 2 As shown, when the circular light spot is projected outside the circular area of ​​the hole feature or on part of the edge, a light spot signal will be formed on the workpiece surface, and the image processing module 5 will transmit the screening and identification results to the controller 6. The controller 6 determines based on the results that the contact gem ball 4 continues to measure along the theoretical center point space coordinates and vector direction of the hole and other characteristic elements. There is a risk of collision with the workpiece surface. The controller 6 executes the correction instruction for the deviation of the coordinate value of the theoretical position of the center point O of the hole and other characteristic elements. The correction method is shown in the method for automatically correcting the deviation according to the light spot position. The measuring machine 1 guides the probe module 2 and the contact gem ball 4 to measure the surface point or edge point of the hole surface, and the deviation of the center point position of the hole and other characteristic elements in the three directions of the coordinate system X, Y, and Z is approximately obtained and transmitted to the controller 6;

[0096] The controller 6 obtains the new spatial coordinate value of the center position of the hole through calculation. Assuming the corrected coordinate values ​​are X1, Y1, and Z1, the measuring machine 1 guides the contact gem ball 4 to enter the inner edge of the characteristic hole for touch measurement according to the corrected spatial position coordinate value signal of the hole and other characteristic elements, thereby obtaining the measured coordinate value of the actual spatial position of the hole characteristic element, and by comparing it with the coordinate value of the center point of the theoretical hole and other characteristic elements created and defined, the coordinate position deviation value of the hole and other characteristic elements is obtained.

[0097] More importantly, the hole center correction coordinate value and hole center coordinate deviation value are obtained. The specific situation in the specific coordinate trimming process is as follows:

[0098] As shown in the attached figure of the specification Figure 2As shown, when the circular spot includes a circular area partially overlapping the spot and the hole and other characteristic elements, and only the incomplete spot signal appears on the surface area of ​​the hole and other characteristic elements, the controller 6 determines that there is a risk of collision, and the control system prompts whether to start the method of automatically correcting the deviation hole space coordinate position according to the spot position. Select "yes", and through the display of the workpiece digital model on the measurement software, define and create three theoretical surface sample points that can represent the deviation in the X, Y, and Z directions around the hole and other characteristic elements, where

[0099] The surface point in the X direction can be any point on the left and right sides, and the marked positions are X1 and X2 respectively;

[0100] The surface point in the Y direction can be any point on the upper and lower sides, and the marked positions are Y1 and Y2 respectively;

[0101] The surface point in the Z direction can be collected at any point in the middle of the shadow area in the hole projection area, and the marked positions are Z1, Z2, Z3, and Z4 respectively;

[0102] After the sampling position of the surface sample theoretical point is set, the contact gem ball 4 first moves downward in the vertical direction of the hole projection plane, and randomly collects a surface point on the projection plane of the hole and other characteristic elements to obtain the Z-direction actual deviation value △Z1 of the surface point, which is approximately equivalent to knowing the Z-direction deviation of the hole center position in the A1 coordinate system;

[0103] Then, according to the positive and negative deviation values ​​of the surface points in the Z direction, the A1 coordinate system is translated by the △Z1 value in the Z direction to obtain the coordinate system A2. In the coordinate system A2, a surface point is randomly collected at the edge of X1 or X2 to obtain the actual deviation value △X1 of the surface point in the X direction, which is approximately the X-direction deviation value of the hole center position in the A1 coordinate system.

[0104] After the X direction of the A2 coordinate system is translated by △X1, the coordinate system A3 is obtained. In the coordinate system A3, a surface point is randomly collected at the edge of Y1 or Y2 to obtain the actual deviation value △Y1 of the surface point in the Y direction.

[0105] Approximately knowing the Y deviation of the hole center position in the A1 coordinate system, at this time, the approximate spatial position coordinate deviation of the deviation hole and other characteristic elements in the X, Y, and Z directions is calculated. The Z-direction surface sample point on the projection surface of the hole and other characteristic elements must be collected at the first point, and the X and Y directions are collected as the second or third points. The collection order can be interchanged. According to the deviation in the three directions, the theoretical coordinate values ​​X, Y, and Z of the center point position of the hole and other characteristic elements created and defined previously are corrected to X1, Y1, and Z1, where

[0106] X1=X+△X1, Y1=Y+△Y1, Z1=Z+△Z1, at this time, the controller 6 guides the coordinate system to return to the workpiece coordinate system A1, and the contact gem ball 4 enters the hole and other characteristic elements according to the corrected hole center position coordinate values ​​X1, Y1, Z1 to measure and obtain its actual space coordinate position value.

[0107] It should be noted that the above technical principle confirms the risk of collision of the stylus 7 through the light spot signal, and automatically finds the logic and algorithm of measurement for a given hole feature deviation when there is a collision risk, thereby guiding the stylus 7 to complete the smooth measurement of the hole position coordinates, reducing the risk of collision of the stylus 7, reducing the frequency of damage to the stylus 7 and other components, improving measurement efficiency, saving costs, and creating certain economic benefits.

[0108] To sum up, according to the technical solution of the embodiment of the present application, when the position coordinates of the center point of characteristic elements such as holes have a large deviation, the measuring machine can filter the position signal of the light spot through convolutional neural network image recognition to determine whether there is a risk of collision for the measuring needle 7 of the measuring machine 1. When it is determined that there is a risk of collision, the measuring machine 1 adjusts the measurement strategy, and collects sample point positions of the surface of given characteristic elements such as holes in three directions in space, guides the measuring machine 1 to measure the surface sample points, and approximately obtains the actual deviation of characteristic elements such as holes in the spatial coordinate system. The controller 6 recalculates the spatial coordinate value of the center point of the characteristic elements such as holes according to the deviation and corrects it, thereby guiding the measuring machine 1 to complete the automatic measurement of the spatial position coordinates of characteristic elements such as holes with large deviations.

[0109] In a second aspect, an embodiment of the present application provides a method for measuring the coordinate position of a hole in a chassis of a vehicle body based on the device for measuring the coordinate position of a hole in a chassis of a vehicle body mentioned in the first aspect, and the method comprises the following steps:

[0110] S1. Construct a three-dimensional space coordinate system of the workpiece to obtain the theoretical coordinate value of the hole center of the hole feature of the target workpiece;

[0111] S2, the controller 6 sends a theoretical movement control instruction to the measuring machine 1 based on the theoretical coordinate value of the hole center;

[0112] S3, the measuring machine 1 responds to the movement control instruction, controls the probe module 2 to drive the contact gem ball 4 to move, so that the contact gem ball 4 is located directly above the theoretical coordinate value of the hole center, and the height difference is equal to the preset theoretical safety distance;

[0113] S4, the measuring machine 1 controls the probe module 2 to drive the contact gem ball 4 to move vertically downward toward the theoretical coordinate value of the hole center at a preset slow-down speed, and controls the laser emitter 3 to continuously emit vertically downward laser through the contact gem ball 4 toward the theoretical center position of the hole feature;

[0114] S5, the measuring machine 1 controls the image processing module 5 to collect the spot image formed by the laser emitted by the laser transmitter 3 on the upper surface of the hole feature of the target workpiece;

[0115] S6. If the image processing module 5 does not detect the spot image on the upper surface of the hole feature of the target workpiece, the measuring machine 1 controls the probe module 2 to drive the contact gem ball 4 to continue to move vertically downward toward the theoretical coordinate value of the hole feature center at a preset slow-down speed until the hole coordinate position measurement action is completed;

[0116] S7, if the image processing module 5 detects a spot image on the upper surface of the hole feature of the target workpiece and feeds it back to the measuring machine 1, the measuring machine 1 determines that there is a measurement collision risk between the measuring needle 7 and the target workpiece;

[0117] S8, the measuring machine 1 controls the probe module 2 to drive the contact gem ball 4 to continue to move vertically downward toward the hole projection surface at a preset slow-down speed, and collects the first curved surface point on the Z surface of the target workpiece hole;

[0118] S9, taking the coordinate value of the first curved surface point as the relative reference point, the measuring machine 1 controls the probe module 2 to drive the contact gemstone ball 4 to collect the second curved surface point and the third curved surface point on the X surface and the Y surface of the target workpiece respectively;

[0119] S10, obtaining a Z-direction deviation value, an X-direction deviation value, and a Y-direction deviation value based on the first curved surface point, the second curved surface point, and the third curved surface point;

[0120] S11, the measuring machine 1 obtains the corrected coordinate value of the hole center based on the theoretical coordinate value of the hole center, the Z-direction deviation value, the X-direction deviation value and the Y-direction deviation value; wherein,

[0121] The target workpiece is a plate structure, the X surface is perpendicular to the X axis of the three-dimensional space coordinate system of the workpiece, the Y surface is perpendicular to the Y axis of the three-dimensional space coordinate system of the workpiece, and the Z surface is perpendicular to the Z axis of the three-dimensional space coordinate system of the workpiece.

[0122] It should be noted that the collection order of the surface points on the X surface and the Y surface can be interchanged, but when collecting the third surface point, the coordinate value of the first surface point and the coordinate value of the second surface point must be used as relative reference points at the same time.

[0123] The embodiment of the present application uses a spot image formed by laser projection to determine if there is a large deviation between the actual position of the hole and the theoretical position. Continuing automatic measurement by contacting the gem ball will result in a risk of hitting the needle. At this time, the controller automatically guides the probe module to perform a corrected measurement of the theoretical center coordinate value of the hole feature of the automobile workpiece, and automatically detects the hole feature based on the corrected center position coordinate value parameters, thereby effectively improving work efficiency while ensuring detection safety.

[0124] Further, the upper surface of the target workpiece is the Z surface;

[0125] A group of symmetrical side walls of the target workpiece is a group of X surfaces, and another group of symmetrical side walls is a group of Y surfaces.

[0126] After obtaining the corrected coordinate value of the hole center, the method further comprises the following steps:

[0127] The measuring machine 1 controls the probe module 2 to drive the contact gemstone ball 4 to move, so that the contact gemstone ball 4 is located directly above the corrected coordinate value of the hole center, and the height difference is equal to the preset theoretical safety distance;

[0128] The measuring machine 1 controls the probe module 2 to drive the contact gemstone ball 4 to move vertically downward toward the hole center correction coordinate value at a preset slow-down speed, and controls the laser emitter 3 to continuously emit vertically downward laser through the contact gemstone ball 4 toward the hole center correction coordinate value;

[0129] The measuring machine 1 controls the image processing module 5 to collect the spot image formed on the upper surface of the target workpiece hole feature by the laser emitted by the laser emitter 3;

[0130] If the image processing module 5 does not detect the spot image, the measuring machine 1 controls the probe module 2 to drive the contact gem ball 4 to continue to move vertically downward toward the hole center corrected coordinate value at a preset slow descent speed until the hole feature measurement action is completed.

[0131] It should be noted that the method for measuring the coordinate position of the hole in the chassis of the vehicle body mentioned in the second aspect is similar to the technical principle of the device for measuring the coordinate position of the hole in the chassis of the vehicle body mentioned in the first aspect in terms of technical issues, technical means and technical effects, and will not be elaborated here.

[0132] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0133] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0134] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A vehicle chassis hole coordinate position measuring device, characterized in that: The device comprises: A measuring machine (1), wherein the measuring machine (1) is equipped with a probe module (2) having horizontal movement function and vertical movement function; The measuring machine (1) is also provided with a laser transmitter (3) connected to the probe module (2) by signal, and the transmitting end of the laser transmitter (3) is vertically downward; The measuring machine (1) is also provided with a contact gemstone ball (4) wrapped around the emission end of the laser emitter (3); The measuring machine (1) is also equipped with an image processing module (5) for performing image acquisition and image analysis; A controller (6) connected to the measuring machine (5) by signal; wherein: The measuring machine (1) is signal-connected to the probe module (2), the laser transmitter (3) and the image processing module (5); The probe module (2) and the image processing module (5) are arranged side by side and move synchronously, and the laser emitter (3) is located at the lower end of a probe (7) arranged at the bottom of the combination of the probe module (2) and the image processing module (5); The circular diameter of the laser spot emitted by the laser emitter (3) onto the upper surface of the target workpiece through the contact gemstone ball (4) is the same as the diameter of the contact gemstone ball (4).

2. The vehicle chassis hole coordinate position measuring device according to claim 1, characterized in that: The controller (6) is also used to construct a three-dimensional space coordinate system of the workpiece and obtain the theoretical coordinate value of the hole center of the hole feature of the target workpiece.

3. The vehicle body chassis hole coordinate position measuring device according to claim 2, characterized in that: The measuring machine (1) is also used to send a theoretical movement control instruction to the measuring machine (1) based on the theoretical coordinate value of the hole feature center, and control the probe module (2) to drive the contact gem ball (4) to move, so that the contact gem ball (4) is located directly above the theoretical coordinate value of the hole feature center, and the height difference is equal to a preset theoretical safety distance.

4. The vehicle chassis hole coordinate position measuring device according to claim 3, characterized in that: The controller (6) is also used to control the probe module (2) through the measuring machine (1) to drive the contact gem ball (4) to move vertically downward toward the theoretical coordinate value of the hole center at a preset slow descent speed, and control the laser emitter (3) to continuously emit vertically downward laser through the contact gem ball (4) toward the theoretical coordinate value of the hole feature center.

5. The vehicle chassis hole coordinate position measuring device according to claim 4, characterized in that: The controller (6) is also used to control the image processing module (5) through the measuring machine (1) to collect a light spot image formed on the target workpiece by the laser emitted by the laser emitter (3).

6. The vehicle chassis hole coordinate position measuring device according to claim 5, characterized in that: If the image processing module (5) does not detect the light spot image on the upper surface of the hole feature, the measuring machine (1) is also used for the probe module (2) to drive the contact gem ball (4) to continue to move vertically downward toward the theoretical coordinate value of the center of the hole feature at a preset slow descent speed until the measurement of the center coordinate position of the hole feature of the target workpiece is completed.

7. The vehicle chassis hole coordinate position measuring device according to claim 6, characterized in that: If the image processing module (5) detects the light spot image on the upper surface of the hole feature of the target workpiece and feeds it back to the measuring machine (1), the measuring machine (1) determines that there is a measurement collision risk between the measuring needle (7) and the target workpiece; The measuring machine (1) controls the probe module (2) to drive the contact gemstone ball (4) to continue to move vertically downward in the direction of the hole projection surface at a preset slow-down speed, and collects a first curved surface point on the upper surface of the hole feature of the target workpiece; The measuring machine (1) is also used to use the coordinate value of the first curved surface point as a relative reference point to control the probe module (2) to drive the contact gemstone ball (4) to collect a second curved surface point and a third curved surface point on the X surface and the Y surface of the target workpiece respectively; The measuring machine (1) is also used to obtain a Z-direction deviation value, an X-direction deviation value, and a Y-direction deviation value based on the first curved surface point, the second curved surface point, and the third curved surface point; The measuring machine (1) is also used to obtain the hole center correction coordinate value based on the hole feature center theoretical coordinate value, the Z-direction deviation value, the X-direction deviation value and the Y-direction deviation value; wherein, The target workpiece is a plate structure, the X surface is perpendicular to the X axis of the three-dimensional space coordinate system of the workpiece, the Y surface is perpendicular to the Y axis of the three-dimensional space coordinate system of the workpiece, and the Z surface is perpendicular to the Z axis of the three-dimensional space coordinate system of the workpiece.

8. The vehicle chassis hole coordinate position measuring device according to claim 7, characterized in that: The upper surface of the hole feature of the target workpiece is the Z surface; A group of symmetrical side walls of the target workpiece is a group of X surfaces, and another group of symmetrical side walls is a group of Y surfaces.

9. A method for measuring the coordinate position of a vehicle chassis hole according to any one of claims 1, characterized in that: The method comprises the following steps: Construct a three-dimensional space coordinate system of the workpiece to obtain the theoretical coordinate value of the hole center of the hole feature of the target workpiece; The controller (6) sends a theoretical movement control instruction to the measuring machine (1) based on the theoretical coordinate value of the hole center; The measuring machine (1) responds to the movement control instruction and controls the probe module (2) to drive the contact gemstone ball (4) to move, so that the contact gemstone ball (4) is located directly above the theoretical coordinate value of the hole center, and the height difference is equal to a preset theoretical safety distance; The measuring machine (1) controls the probe module (2) to drive the contact gemstone ball (4) to move vertically downward toward the theoretical coordinate value of the hole center at a preset slow-down speed, and controls the laser emitter (3) to continuously emit vertically downward laser light through the contact gemstone ball (4) toward the theoretical center position of the hole feature; The measuring machine (1) controls the image processing module (5) to collect a spot image formed on the upper surface of the hole feature of the target workpiece by the laser emitted by the laser emitter (3); If the image processing module (5) does not detect the light spot image on the upper surface of the hole feature of the target workpiece, the measuring machine (1) controls the probe module (2) to drive the contact gemstone ball (4) to continue to move vertically downward toward the theoretical coordinate value of the center of the hole feature at a preset slow descent speed until the measurement action of the hole coordinate position is completed; If the image processing module (5) detects the light spot image on the upper surface of the hole feature of the target workpiece and feeds it back to the measuring machine (1), the measuring machine (1) determines that there is a measurement collision risk between the measuring needle (7) and the target workpiece; The measuring machine (1) controls the probe module (2) to drive the contact gemstone ball (4) to continue to move vertically downward in the direction of the hole projection surface at a preset slow-down speed, and collects a first curved surface point on the Z surface of the target workpiece hole; Taking the coordinate value of the first curved surface point as a relative reference point, the measuring machine (1) controls the probe module (2) to drive the contact gemstone ball (4) to collect a second curved surface point and a third curved surface point on the X surface and the Y surface of the target workpiece respectively; Based on the first curved surface point, the second curved surface point and the third curved surface point, a Z-direction deviation value, an X-direction deviation value and a Y-direction deviation value are obtained; The measuring machine (1) obtains the hole center corrected coordinate value based on the hole center theoretical coordinate value, the Z-direction deviation value, the X-direction deviation value and the Y-direction deviation value; wherein: The target workpiece is a plate structure, the X surface is perpendicular to the X axis of the three-dimensional space coordinate system of the workpiece, the Y surface is perpendicular to the Y axis of the three-dimensional space coordinate system of the workpiece, and the Z surface is perpendicular to the Z axis of the three-dimensional space coordinate system of the workpiece.

10. The method for measuring the coordinate position of a hole in a vehicle chassis according to claim 9, characterized in that: Features: The upper surface of the target workpiece is the Z surface; A group of symmetrical side walls of the target workpiece is a group of X surfaces, and another group of symmetrical side walls is a group of Y surfaces.

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