JPH025364Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a device for measuring deformation of a vehicle body.

(Prior Art) Conventionally, when measuring the deformation of a vehicle body, there have been methods such as a laser light method, a manual setting method, and a mechanism method that do not have the ability to measure changes in depth.

(Problems to be Solved by the Invention) These conventional devices have the disadvantage that it is not easy to fix and set the reference portion of the vehicle body. In particular, when determining the reference plane of the vehicle body, there were many cut-and-try elements in the work of determining three reference points on the intact part, which required a lot of time and was also troublesome.

An object of the present invention is to provide a device that can easily measure the deformation of a vehicle body without having to accurately set the vehicle body in a measuring section.

[Structure of the idea]

(Means for Solving the Problems) The present invention includes a clamping device 26 that clamps and fixes the vehicle body B of an automobile, and a guide frame 2 provided in the front-rear direction with respect to the vehicle body fixed by the clamping device 26. , a movable frame 4 provided so as to be movable in the front and back direction along this guide frame 2, and this movable frame 4.
It consists of a laser optical system that is movable in the vehicle width direction and vertical direction along the vehicle, and a light projecting section 21 and a light receiving section 22 in this laser optical system.

The light projecting section 21 directs the laser beam to the vehicle body B.
irradiates the measurement surface. Further, the light receiving section 22 collects a part of the diffusely reflected light of the laser beam on the vehicle body measurement surface, and detects a change in the depth of the vehicle body measurement surface by measuring a change in the imaging position. It is.

(Function) The present invention moves a three-dimensionally movable laser optical system along the inside of the guide frame 2 and the moving frame 4 with respect to the vehicle body fixed in a fixed position by the clamp device 26. A laser beam is irradiated to multiple points on the vehicle body, and a portion of the diffusely reflected light of the laser beam is used to measure changes in the depth of the multiple measurement surface of the vehicle body. By comparing the damaged body data thus obtained with the intact body data, the deformed position and degree of deformation of the damaged body are measured.

(Example) An example of the present invention will be described based on FIGS. 1 to 5.

A guide frame 2 in the Y direction is spanned and fixed over the support frame 1, and a movable base frame 3 is fitted onto this guide frame 2 so as to be slidable in the Y direction, and a substantially C-shaped structure is installed inside the movable base frame 3. The movable frame 4 is fitted so as to be slidable in the X direction.

Further, sprocket wheels 5 are rotatably attached to both ends of the guide frame 2, an endless chain 6 is wound between the sprocket wheels 5 at both ends, and the movable base frame is attached to a part of the endless chain 6. 3, and attach the mounting plate 8 on the upper surface to the sprocket foil 5 at one end.
A drive shaft of a motor 9 fixed to is connected to the movable base frame 3 and the movable frame 4 in the Y direction by driving the motor 9 in forward or reverse rotation. Further, a digital magnetic scale 11 is fixed to the side surface of the guide frame 2, and this scale 11
Thus, the moving position of the movable base frame 3 is electrically detected.

Further, a mechanism is provided for moving the movable frame 4 in the vehicle width direction with respect to the guide frame 2 according to the gap in the space 15 at the bottom of the movable frame 4. That is, a rack 12 is fixed to a part of the upper surface of the moving frame 4, a motor 13 is fixed to the moving base frame 3, a pinion 14 that meshes with the rack 12 is fixed to the drive shaft of the motor 13, and By driving this motor 13 forward or backward, the movable frame 4 is moved forward and backward in the X direction, thereby compensating the space 15 at the bottom of the C-shaped movable frame 4 as described later. Do it like this.

Further, an endless chain 16 is disposed from one end of the moving frame 4 to the other end. This endless chain 16 is supported by being wrapped around a sprocket foil 17 rotatably pivoted on one end, the other end, and a bent portion of the movable frame 4. A drive shaft of a fixed motor 18 is connected, and a laser optical bench 19 movably fitted to the movable frame 4 is fixed to a part of the endless chain 16, and the motor 18 is rotated in the forward or reverse direction. By driving, the laser optical bench 19 is moved back and forth between one end and the other end of the moving frame 4.

Further, the laser optical bench 19 is provided with a laser optical system consisting of a laser beam projecting section 21 and a light receiving section 22. The light projecting section 21 generates a laser beam using helium neon gas or the like, and the light receiving section 22 consists of a lens system 23 and a screen 24 made up of a large number of microscopic light receiving element groups such as photodiode arrays. It is. Then, the laser beam is irradiated onto the object surface and reflected diffusely,
A part of that diffusely reflected light, that is, with the same density, is 1
Scattered light emitted in a solid angle from a point to the lens aperture is passed through the lens system 23 to a screen 24, such as a photodiode array, placed at the imaging position of the lens system 23, which can measure fluctuations in the imaging position. The light is focused, and the deformation of the depth of the object plane is extracted as a change in the imaging position on the screen 24 through the change in the optical axis that constitutes the solid angle.

To explain the measurement principle of the above laser optical system in more detail, the diffusely reflected light is a point light source P ₀ on the object plane.
It can be thought of as a ray of light that is emitted with the same density from all angles. First, if we take a solid angle from the point light source P ₀ to the lens aperture, the diffusely reflected light beams within that solid angle will not intersect and will form an imaging point on the rear screen 24 as shown in Figure 4a in accordance with optical principles. tie. Next, as the object moves and the point light source P ₀ of the diffusely reflected light moves (due to a change in depth), the solid angle changes somewhat and the optical axis also changes somewhat. Therefore, the imaging point moves as shown in Fig. 4b, and by performing differential processing on its output, the amount of movement l ₀ can be clearly detected as shown in Fig. 5.
You can see changes in the depth of objects. The photodiode array forming the screen 24 generally has a resolution of 15 μm and an imaging surface of about 25 mm. Therefore, it is necessary to set the reference position of the screen 24 before starting the work. In addition, since the image forming surface of the screen 24 is limited in this way, by replacing or shifting the lens system 23, changes in the depth of various object planes can be adjusted appropriately within the range of the screen 24. so that it can be understood.

Additionally, a digital magnetic scale 2 is installed on the side surface of the movable frame 4 from one end of the movable frame 4 to the other end.
5 is fixed, and the moving position of the laser optical bench 19 can be electrically detected using the scale 25.

Further, a clamp device 26 is provided for fixing the vehicle body B of the automobile to the floor surface approximately in the center of the support frame 1.
will be established. That is, two hydraulic jack vertically movable rods 27 are provided protruding from the floor surface, and the center portion of the board 28 is fixed to the upper end of each vertically movable rod 27.
An inner clamp plate 29 is fixed to both ends of the inner clamp plate 29, and an outer clamp plate 31 is attached to the outside of this inner clamp plate 29.
be fixed by bolting. Then, the body sealing portions protruding from both sides of the lower surface of the cabin of the vehicle body B are inserted between the clamp plates 29 and 31, and the clamp plates 29 and 31 are tightened with bolts to fix the body sealing portions. . The vertically movable rod 27 of the hydraulic jack is provided with a scale 32 so that the vertical position of the vertically movable rod 27 can be accurately measured.

Further, a marker member is attached to the check point P so that the laser optical system can be accurately directed to the check point P as an inspection section of the vehicle body B. For example, as shown in FIG. 6a, a ring-shaped marker member 36 with a magnet 35 provided on the back is attached to the check point P by the attraction force of the magnet 35, and as shown in FIGS. 6b and c. As such, this sign member 3
The laser optical bench 19 scans a plurality of positions 6 to confirm the intervals between each pulse train, and determines the final coordinate position O. Note that the laser optical bench 19 may be moved manually, but if the drive section of the laser optical bench 19 is provided with self-diagnosis capability by applying feedback control, etc., the laser optical bench 19 can be moved manually. The position is controlled while checking the change in the pattern of the member 36 and is automatically controlled to the final coordinate position O. In addition to the above-mentioned ring-shaped marking member, a radial-shaped marking member may be used. Further, when the check point is a bolt hole, such a sign member is inserted into the hole and attached.

Next, a first method of measuring deformation of vehicle body B using the apparatus of this embodiment will be explained.

The vehicle body of an automobile that has been damaged due to a traffic accident or the like is fixed using the clamping device 26, and moving bases are sequentially placed at the Y coordinates of various check points P on the damaged body that directly affect the area around the legs of the automobile. The frame 3 and the movable frame 4 are fixed, and the movable frame 4 is fitted around the outer periphery of the damaged body, and the following operations are performed using the Y coordinates of the various check points P described above. That is, the laser optical bench 1
9 is moved along the inside of the moving frame 4, a laser beam is irradiated to the vicinity of the check point of the damaged body, and the reflected light of this laser beam continuously deforms the depth of the damaged body in the vicinity of the check point. The system scans and measures the damage, and stores the continuous damage body data in a computer or other device. This damaged body data is then compared with intact body data, such as catalog data for the vehicle body or data previously obtained by continuous scanning of intact vehicle bodies in the vicinity of check points using a laser optical system.
If a partially inconsistent portion is found by comparing the damaged body data and intact body data, the inconsistent portion is determined as a deformed portion.

If body data corresponding to the space 15 of the moving frame 4 is required, the gap in the space 15 can be compensated for by moving the moving frame 4 in the X direction with respect to the moving base frame 3. be able to.

Next, a second deformation measuring method for more accurately and easily comparing the damaged body data and undamaged body data will be explained with reference to FIG.

First, intact body data for vehicle bodies B of various types of automobiles is collected in advance. That is, the laser optical bench 19 is sequentially moved to positions near the reference points Pa, Pb, Pc and various check points P ₁ , P ₂ , P ₃ , P ₄ as inspection parts, and each check point P ₁ , P ₂ , P ₃ , P ₄ and reference point Pa,
In the vicinity of Pb and Pc, the laser optical bench 19 is moved against the marking member 36 to determine the accurate positions of each check point P ₁ , P ₂ , P ₃ , P ₄ and reference point Pa, Pb, Pc. , each check point P ₁ ,
Laser light is irradiated while moving the laser optical table 19 sequentially to P ₂ , P ₃ , P ₄ and the reference points Pa, Pb, Pc, and the check points P ₁ , Measure the relative depth deformation of P ₂ , P ₃ , P ₄ and reference points Pa, Pb, Pc. As a result, the reference plane A of the intact body is determined by the three reference points Pa, Pb, and Pc, and the various check points PP ₁ that directly affect the leg circumference, etc.
Since the relative relationship among P ₂ , P ₃ , and P ₄ can be determined in advance as shown in FIG. 7a, the intact body data is stored in a computer or the like.

Next, similar depth measurements using the laser optical bench 19 were performed on the damaged body, and three reference points were measured.
Reference plane of damaged body determined by Pa′, Pb′, Pc′
A′ and various check points P ₁ ′, P ₂ ′, P ₃ ′,
The relative relationship with P ₄ ' is determined as shown in FIG. 7b, and the damaged body data is stored in a computer or the like. The reference plane of the above damaged body
The three reference points Pa', Pb', and Pc' for determining A' are determined by installing marker members 36 in the same parts of the intact body as the reference points Pa, Pb, and Pc, and these points are determined from the intact body of the damaged body. Try to get it from the parts. This intact part is, for example, the lower side of the cabin, which is less likely to be deformed even in a collision.

Next, the reference plane A of the intact body and the reference plane A' of the damaged body are subjected to coordinate conversion calculations and comparison processing in a computer, and the comparison is visually confirmed using a CRT display device, etc., and then the intact body is confirmed. Various check points for the body _P1 ,
_{Errors H 1 , H 2 , ​ ​}
H ₃ and H ₄ are measured and displayed as shown in Figure 7c. Therefore, by looking at this display, you can objectively, accurately, and intuitively know the degree and direction of correction, and you can also use the display device to see how various check points will be corrected as the body is being corrected. Because it is displayed as
Corrections can be made extremely easily and accurately.

Note that the diagrams shown in Figures 7a, b, and c are for displaying only the main check points, but continuous scanning with a laser optical system as in the first measurement method is also possible. For example, it is possible to take the shape of the body into a substantially linear shape as shown in FIG. 8, and thereby the main curved surfaces of the body can be modified.

[Effect of idea]

As described above, according to the present invention, a laser optical system that is three-dimensionally movable along a guide frame and a moving frame is moved with respect to a vehicle body fixed in a fixed position by a clamp device, and a laser beam is emitted. The laser beam is irradiated at multiple points on the vehicle body, and some of the diffusely reflected light from this laser beam can be used to measure changes in the depth of the multi-point measurement surface of the vehicle body, making it easy to obtain an overall image of a damaged body, for example. obtained and thus facilitates an overall comparison between the damaged and intact body data, which allows the deformation position and the The effect is that the degree can be easily measured.
In particular, a guide frame is provided in the longitudinal direction of the vehicle body, a movable frame is provided to be movable along the guide frame, and a laser optical system is provided to be movable in the vehicle width direction and vertical direction along the movable frame. Therefore, a three-dimensional guide mechanism that can move the laser optical system over the entire vehicle body can be easily formed using the two members consisting of the guide frame and the moving frame. Further, the movable frame has a notch formed in its lower part to allow the movable frame to move without colliding with the clamp device, and the movable frame is moved in the vehicle width direction relative to the guide frame according to the gap of the space. Since a mechanism for moving the frame is provided, body data corresponding to the space can be obtained by moving the moving frame in the vehicle width direction.
It is possible to measure deformation around the entire circumference of a vehicle body. Moreover, the laser optical system that is moved along the moving frame always faces inward, facing the vehicle body, no matter where it is on the moving frame. There is no need for a separate control system, and the movement of the laser optical system can be easily controlled.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the vehicle body deformation measuring device of the present invention, Fig. 2 is a perspective view of the vehicle body, Fig. 3 is an explanatory diagram of the measurement principle of the laser optical system, and Fig. 4 is An explanatory diagram of the light reception state on the screen, Figure 5 is a graph of the differential processing of it,
Fig. 6a is a perspective view of the marking member, Fig. 6b is a plan view of the marking member, Fig. 6c is an explanatory diagram of its operation, and Figs. 7 and 8 are explanations of the operation of comparing an intact body and a damaged body. It is a diagram. B... Vehicle body, 2... Guide frame, 4... Moving frame, 15... Space section, 19... Laser optical system stand, 21... Light projecting section, 22... Light receiving section, 26...
clamping device.

Claims (1)

[Scope of utility model registration request] A clamp device that clamps and fixes the vehicle body of an automobile, a guide frame provided in the front and back direction with respect to the vehicle body fixed by the clamp device, and a guide frame provided at the bottom that is movable in the front and rear direction along the guide frame. A moving frame formed by cutting out a space for movement without colliding with the clamp device, a laser optical system provided movably in the vehicle width direction and vertical direction along this moving frame, and this laser optical system. The system includes a light projection unit that irradiates a measurement surface of a vehicle body with a laser beam, and a laser optical system that collects a part of the diffusely reflected light of the laser beam on the measurement surface of the vehicle body and measures changes in the imaging position. a light-receiving section for detecting changes in the depth of the measurement surface of the vehicle body; and a mechanism for moving the movable frame in the vehicle width direction with respect to the guide frame according to the gap in the space; A vehicle body deformation measuring device characterized by comparing damaged body data obtained through scanning with intact body data.