KR101582859B1 - Device and method for inspecting valve spring property - Google Patents

Abstract

The present invention relates to a device to inspect valve spring properties, and a method for the same. Provided is the device to inspect valve spring properties comprising: a rotary plate placed in a structure having a valve spring vertically stand on an upper surface thereof; a center lighting emitting light inside the valve spring standing on the rotary plate; a rotation driving means connected to the rotary plate to rotate the rotary plate; a backlight arranged on one side of the valve spring standing on the rotary plate; a camera arranged to face the backlight and the valve spring therebetween to photograph a side image of the valve spring; a pressurization block vertically arranged above the rotary plate, moving upwards and downwards to pressurize and compress the valve spring placed on the rotary plate; a load cell to detect weight exerted on the valve spring via the pressurization block; a vertical transfer apparatus having the pressurization block and the load cell therein to move the pressurization block upwards and downwards; a displacement sensor to detect location information of the pressurization block when the pressurization block moves upwards and downwards; a controller to obtain, from a signal transmitted from the load cell and the displacement sensor, weight values for a first displacement and a second displacement of a corresponding valve spring, and detecting the number of line contact turns and a loaded height for the first displacement and the second displacement of the corresponding valve spring by analyzing images photographed by the camera; and an arrangement means to arrange the valve spring in order for a center of the valve spring placed on the rotary plate to be matched with the center of the rotary place.

Description

Technical Field [0001] The present invention relates to a device for measuring a valve spring characteristic,

The present invention relates to a valve spring characteristic measuring apparatus and a characteristic measuring method, and more particularly, to a valve spring characteristic measuring apparatus and method for measuring a valve spring force by compressing a valve spring by applying a load to the valve spring, The present invention relates to a valve spring characteristic measuring apparatus and a characteristic measuring method for measuring an image of a side surface of a valve spring while rotating the valve spring by 360 ° and analyzing the captured image and automatically measuring characteristic information such as the number of turns of the corresponding valve spring .

Normally, the valve spring is attached to the intake valve and the exhaust valve of the engine to regulate the opening and closing of the intake valve and the exhaust valve, and is an important component that greatly affects engine driving.

Such valve springs are designed and manufactured to have characteristics corresponding to engine specifications and opening characteristics of intake valves and exhaust valves.

On the other hand, since the characteristic of the valve spring changes according to the shape of the spring, if an error more than an allowable range is generated in the manufactured valve spring, the performance of the engine is lowered and noise or vibration is generated.

Thus, although strict tolerance management is required in the manufacture of the valve springs, effective management of the valve springs has not been achieved due to the absence of proper measuring equipment for testing the valve springs.

In view of such conventional problems, the applicant of the present invention has developed a load testing apparatus capable of continuously performing the primary load inspection and the secondary load inspection of the valve springs using one apparatus. Open No. 10-2011-0105909.

The load inspection apparatus disclosed in the above-mentioned invention comprises a primary load inspection unit and a secondary load inspection unit. The primary load inspection and the secondary load inspection for the valve spring can be performed quickly and accurately.

However, the above-described disclosed load testing apparatus can measure the load value when the valve spring is pressed to a required displacement, and can not measure additional detailed information such as the number of winding contacts and the tightening height.

Published Japanese Patent Application No. 10-2011-0105909 (published on September 28, 2011)

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus and a method for controlling a valve spring in which a load value for a primary displacement, a number of turns, And to provide a valve spring characteristic measuring apparatus and a characteristic measuring method for automatically measuring characteristic information of a valve spring.

According to an aspect of the present invention, there is provided a valve assembly comprising: a rotary plate that rotates together with a valve spring, the valve spring being vertically erected on an upper surface thereof; A center light for emitting light from inside the valve spring installed on the rotating plate; Rotation driving means connected to the rotation plate to rotate the rotation plate; A backlight for emitting light toward the valve spring from one side of the valve spring installed on the rotation plate; A camera disposed to face the backlight and the valve spring to photograph a side image of the valve spring that is rotated by a predetermined angle unit by the rotation plate; A pressing block which is arranged to be spaced apart from the rotary plate at a vertical upper portion of the rotary plate and presses and compresses the valve spring placed on the rotary plate while moving in the vertical direction; A load cell for detecting a magnitude of a load applied to the valve spring through the press block; An up-and-down mechanism provided with the press block and the load cell, and vertically moving the press block; A displacement sensor for detecting position information of the press block when the press block is moved up and down; A load value for the primary displacement of the corresponding valve spring and a load value for the secondary displacement are obtained from signals transmitted from the load cell and the displacement sensor, and the image captured by the camera is analyzed, A controller for detecting the number of winding wires and the tight contact with respect to the secondary displacement; And alignment means for aligning the valve springs so that the center of the valve springs placed on the spindle coincides with the center of the spindle, wherein the alignment means is arranged in the direction of approaching or departing from the valve springs at one side of the valve springs A first positioning jig having a V-shaped first groove formed in a side face of the valve spring for receiving a side portion of the valve spring; And a second groove having a V-shaped structure in which a side portion of the valve spring is inserted into a side surface facing the valve spring, the second groove having a V- Position alignment jig; And moving means for moving the first and second aligning jigs so that the first and second aligning jigs move in a direction in which the first and second aligning jigs are moved toward or away from each other.

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In the apparatus for measuring a valve spring characteristic, the moving means includes a left-handed thread passing through the first and second aligning jigs, which is engaged with the first aligning jig to induce movement of the first aligning jig, A conveying shaft formed on the other side of the second aligning jig and having a right screw for guiding movement of the second aligning jig; And a feed motor connected to the feed shaft to rotate the feed shaft.

In the apparatus for measuring a characteristic of a valve spring, the center light is installed to be inserted into a central portion of a valve spring through a rotating plate, and a light diffusing portion having a slit structure extending in a vertical direction is formed on a side portion facing the camera ≪ / RTI >

In the valve spring characteristic measuring apparatus, the up-and-down moving mechanism may include a lift block having the load cell and the push block installed therein; At least one column combined with the lift block to support the vertical movement of the lift block; A transfer screw installed to have a vertical structure inside or outside the column, the transfer screw being coupled with the lift block; And an elevating motor connected to the conveying screw to rotate the conveying screw.

In addition, the present invention provides a method of manufacturing an air conditioner, comprising: (S110) setting up a valve spring vertically on an upper surface of a rotating plate; Detecting a position where a load value is 0 by contacting a valve spring placed on the rotary plate with a pressing block, and setting a displacement value of the position to 0 (S120); After the step S120, a step S130 of lowering the pressure block so that the valve spring is compressed by a predetermined primary displacement and detecting a load value detected by the load cell at the primary displacement position as a load value with respect to the primary displacement; After the step S130, the step S140 of photographing the side image of the valve spring with the camera while rotating the valve spring by a preset angle unit by operating the rotation plate; After the step S140, a step S150 of lowering the pressure block so that the valve spring is compressed by a predetermined secondary displacement and detecting a load value detected by the load cell at the secondary displacement position as a load value with respect to the secondary displacement; After step S150, the step S160 of photographing the side image of the valve spring with the camera while operating the rotation plate to rotate the valve spring by a predetermined angle unit; And a step S170 of analyzing the image photographed in the step S140 and the image photographed in the step S160 to detect the number of turns of the line for the primary displacement of the valve spring and the number of turns of the line for the secondary displacement, The valve spring characteristic measuring method according to the present invention is characterized by comprising:

In the valve spring characteristic measuring method, after the step S160, the pressure block is further lowered to compress the valve spring, and the spring constant value calculated from the load value detected by the load cell and the displacement value detected by the displacement sensor (S180) of detecting a displacement value at the time of reaching the set reference constant value by the close contact of the valve spring (S180).

The number of turns of the line contact with respect to the primary displacement and the number of turns of the line of contact with respect to the secondary displacement are detected by the upper end of the valve spring and the distance between two neighboring volumes of the valve spring is After detecting a point of 0.05 mm, the number of turns of line contact can be calculated from the upper end point, the relative angle of 0.05 mm and the outer diameter of the valve spring.

In the method of measuring the characteristics of the valve spring, in steps S140 and S160, illumination is emitted from the inside of the valve spring toward the camera using a center light inserted into the center of the valve spring, It is preferable to photograph the image of the valve spring in a state in which the backlight disposed to face the camera radiates illumination toward the camera.

According to the present invention having such characteristics as described above, it is possible to quickly and accurately detect the detailed characteristic information such as the primary load, the secondary load, the number of turns of the line-to-line contact at the time of the first and second loads, It is possible to improve the efficiency of quality control of the valve springs.

1 is a perspective view of a valve spring characteristic measuring apparatus according to a preferred embodiment of the present invention,
FIG. 2 is a perspective view of a valve spring characteristic measuring apparatus according to a preferred embodiment of the present invention,
FIG. 3 is a front view of an apparatus for measuring the characteristics of a valve spring according to a preferred embodiment of the present invention,
4 is a plan view of an apparatus for measuring a characteristic of a valve spring according to a preferred embodiment of the present invention,
FIG. 5 is a perspective view showing a mounting structure of a rotating plate and a center light according to the present invention,
6 is a perspective view of the upper and lower transfer mechanism according to the present invention,
Figure 7 is a perspective view of the alignment means according to the invention,
8 is a diagram showing an image taken by a camera as an image in pixels in black and white,
9 is a view showing a process of detecting an upper end of a valve spring,
10 is a view showing the detected characteristic information through the display device.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a perspective view of an apparatus for measuring the characteristics of a valve spring according to a preferred embodiment of the present invention, FIG. 2 is a perspective view showing a valve spring characteristic measuring apparatus according to a preferred embodiment of the present invention, 4 is a plan view of an apparatus for measuring the characteristics of a valve spring according to a preferred embodiment of the present invention, and FIG. 5 is a perspective view showing the installation structure of a rotating plate and a center light according to the present invention Fig. 6 is a perspective view of the vertical transfer mechanism according to the present invention, and Fig. 7 is a perspective view of the alignment means according to the present invention.

The apparatus for measuring a characteristic of a valve spring according to the present invention detects a first and second load values while applying a load to a valve spring and compresses the valve spring while rotating the valve spring in a compressed state, It is possible to measure detailed characteristic information such as the number of winding lines corresponding to the secondary load value.

The apparatus for measuring the characteristics of a valve spring according to the present invention for realizing such a characteristic includes a rotating plate 110, a center illumination 120, a rotation driving means 130, a backlight 140, a camera 150, a pressing block 160, A load cell 170, an up and down transfer mechanism 180, a displacement sensor 190, and a controller 200.

Reference numeral 100 denotes a light source for illuminating the center of the rotating plate 110, the center illumination 120, the rotation driving means 130, the backlight 140, the camera 150, the vertical transfer mechanism 180, the displacement sensor 190, And a base plate on which the controller 200 is installed.

The rotating plate 110 has a function of rotating the valve spring in addition to providing a space in which the valve spring is placed.

The rotary plate 110 is formed of a circular plate or block, and the upper surface of the valve plate is flat.

A through hole 111 is formed in the central portion of the rotary plate 110 for installing the center light 120.

The center illumination 120 illuminates the inside of the valve spring S from the inside of the camera 150 so that the image of the valve spring S using the camera 150 can be photographed by the camera 150, ) Direction.

The center light 120 is formed in a bar shape and is installed at an inner central portion of the valve spring S. The center light 120 is always installed on the rotation plate 110 to radiate light toward the camera 150 regardless of the rotation of the rotation plate 110 and the valve spring. Through the through hole 111 formed in the rotating plate 110.

On the other hand, a light emitting portion 121 having a slit structure extending in the vertical direction is formed on a side portion of the side surface portion of the center light 120 facing the camera 150, and a light having a linear structure extending in the up and down direction is formed. To the direction of the camera 150.

The light emitting unit 121 may include a light source having a structure extending in a vertical direction on a side surface of the center light 120 or a light source disposed inside the center light 120, And the light emitted from the light source may be irradiated in the direction of the camera 150 through the slit.

The rotation driving means 130 is connected to the rotating plate 110 to rotate the rotating plate 110 so that the rotational force generated by the rotation driving motor 131 is transmitted to the rotating plate 110 through the power transmitting means 132 such as a belt and a pulley, (110) so as to rotate the rotary plate (110).

The backlight 140 is disposed outside the valve spring S such that the camera 150 can take an image of clearly distinguished shadows when shooting the image of the valve spring using the camera 150, And is installed to irradiate light toward the camera 150.

The backlight 140 may be configured as a planar light source so that light can be irradiated uniformly on the entire surface without scattering light on a specific portion of the valve spring.

The camera 150 photographs a side view of the valve spring. The camera 150 has a height substantially equal to that of the valve spring on the rotation plate 110. The camera 150 is installed to face the backlight 140 with the valve spring interposed therebetween, The image of the side of the spring is taken.

The camera 150 may be a known GIGE camera, and may be configured to mount a non-distortion lens 151 on a GIGE camera to photograph an image of a side surface of the valve spring.

The pressing block 160 presses the valve spring placed on the rotary plate 110 at the upper part to compress the valve.

The pushing block 160 is arranged to be spaced apart from the rotary plate 110 at a vertical upper portion of the rotary plate 110 and configured to press down the valve spring while being lowered by the vertical transfer mechanism 180.

Although not shown in the drawing, a hole is formed in the bottom surface of the pressing block 160 to receive and accommodate the center illumination 120 when the valve spring is pressed.

The load cell 170 measures a load value applied to the valve spring by the pressure block 160 during the compression of the valve spring by the pressure block 160. The pressure block 160 and the vertical transfer mechanism 180 As shown in Fig.

That is, the pressure block 160 is connected to the load cell 170 and the load cell 170 is installed in the vertical transfer mechanism 180. According to this structure, when the pressurizing block 160 and the load cell 170 are moved up and down together by the vertical transfer mechanism 180 and the valve spring is compressed by the pressurizing block 160, The transmitted load is transferred to the load cell 170 as it is, and the load value of the load cell 170 can be detected.

The upper transfer mechanism 180 moves the pressing block 160 upward and downward and comprises a vertical block 181, a column 182, a transfer screw 183, and a vertical motor 184.

The elevating block 181 moves the pressing block 160 while moving up and down by the operation of the conveying screw 183 and the elevating motor 184 and the load cell 170 and the pressing block 160 Respectively.

The column 182 is coupled with the lift block 181 to support the lift block 181 in the vertical direction.

1, 2, and 6, two columns 182 are disposed on both sides of the lifting block 181 to support the up-down movement of the lifting block 181. .

When the column 182 is used to support the vertical movement of the lifting block 181, a guide projection or a guide groove having a structure extending in the vertical direction to the column 182 is formed, and the guide projection or the guide A guide groove or a guide protrusion moving in combination with the groove may be formed in the lift block 181 to support the up and down movement of the lift block 181 through the engagement of the guide protrusion and the guide groove.

The conveying screw 183 is installed to have a vertical structure inside or outside the column 182. The conveying screw 183 is coupled with the elevating block 181 to move the elevating block 181 upward and downward .

It is preferable that the conveying screws 183 are installed on both left and right sides of the lift block 181 for stable vertical movement of the lift block 181.

The elevating motor 184 rotates the conveying screw 183 and is configured to rotate the conveying screw 183 by being connected to the two conveying screws 183 via a belt and a pulley.

The displacement sensor 190 detects the position information of the pressing block 160 moved by the vertical transfer mechanism 180 and is connected to the pressing block 160 to directly detect the position information of the pressing block 160 Or to detect the position of the pressing block 160 in such a manner as to be connected to the elevating block 181 moving the pressing block 160 up and down to sense the movement of the elevating block 181. [

Meanwhile, since the displacement sensor 190 having various detection methods has already been commercialized and widely used, a detailed description of the displacement sensor 190 will be omitted.

The controller 200 has a function of controlling the center illumination 120, the rotation driving means 130, the backlight 140, the camera 150, the vertical transfer mechanism 180, and the alignment means 210 And based on the load value and position information transmitted from the load cell 170 and the displacement sensor 190 and the image captured by the camera 150, the load value for the primary displacement and the secondary displacement, .

In the valve spring characteristic measuring apparatus constructed as described above, it is preferable that the aligning means 210 for aligning the valve springs so that the center of the valve spring placed on the rotating plate 110 coincides with the center of the rotating plate 110 Do.

The aligning means 210 includes a first aligning jig 211, a second aligning jig 212 and a moving means 213 for operating the first and second aligning jigs 211 and 212.

The first positioning jig 211 is installed to move in a direction approaching or away from the valve spring on one side of the valve spring S placed on the rotary plate 110. On the side opposite to the valve spring, The first groove 2111 having a V-shaped structure is formed.

The second positioning jig 212 is installed to move toward or away from the valve spring at a position facing the first positioning jig 211 with the valve spring S placed on the rotary plate 110 interposed therebetween And a second groove 2121 having a V-shaped structure in which a side portion of the valve spring is inserted is formed on a side surface facing the valve spring.

When the first positioning jig 211 and the second positioning jig 212 are coupled to face each other with the valve spring interposed therebetween, the first groove 2111 and the second groove 2121 meet, A rectangular hole is formed which moves the valve spring such that the center of the valve spring is located at the center of rotation of the rotary plate 110.

The moving means 213 moves the first and second aligning jigs 211 and 212 so that the first and second aligning jigs 211 and 212 move in mutually symmetrical directions with the valve spring interposed therebetween And is constituted by a conveying shaft 2131 and a conveying motor 2132.

The conveying shaft 2131 extends horizontally and penetrates the first and second aligning jigs 211 and 212. The conveying shaft 2131 is coupled to the first aligning jig 211 to move the first aligning jig 211 And a right screw that is coupled to the second positioning jig 212 to guide movement of the second positioning jig 212 is formed on the other side.

If it is assumed that the first and second positioning jigs 211 and 212 move in the direction close to the valve spring when the transport shaft 2131 rotates in the clockwise direction, The first and second alignment jigs 211 and 212 move in a direction away from the valve spring.

The conveying motor 2132 is connected to the conveying shaft 2131 to rotate the conveying shaft 2131 and operates according to a control signal transmitted from the controller 200. [

The method of measuring a valve spring characteristic according to the present invention, which is implemented by the valve spring characteristic measuring apparatus constructed as described above, includes the steps of: (S110) setting a valve spring vertically on the upper surface of the rotating plate 110; A step S120 of detecting a position where a load value is 0 by contacting a valve spring placed on the rotary plate 110 with a pressing block 160 and setting a displacement value of the position to 0; After step S120, the pressure block 160 is lowered so that the valve spring is compressed by a predetermined primary displacement, and the load value detected by the load cell 170 at the primary displacement position is detected as a load value with respect to the primary displacement Step S130; After step S130, the step S140 of photographing the side image of the valve spring with the camera 150 while operating the rotation plate 110 to rotate the valve spring by a predetermined angle unit; After step S140, the pressure block 160 is lowered so that the valve spring is compressed by a predetermined secondary displacement, and the load value detected by the load cell 170 at the secondary displacement position is detected as a load value with respect to the secondary displacement In operation S150, after step S150, the step S160 of photographing the side image of the valve spring with the camera 150 while operating the rotation plate 110 to rotate the valve spring by a predetermined angle unit; And the controller 200 analyzes the image photographed in the step S140 and the image photographed in the step S160 to detect the number of turns of the line for the primary displacement of the valve spring and the number of turns of the line for the secondary displacement (S170).

In step S110, a worker or a conveying device (not shown) places a valve spring, which is required to be measured, on the rotating plate 110, The valve spring is placed on the rotary plate 110 so that the center of the valve spring is as close to the center of the rotary plate 110 as possible.

On the other hand, when the valve spring is placed on the rotating plate 110, the controller 200 actuates the aligning means 210 to align the valve spring in a predetermined position so that the center of the valve spring coincides with the center of rotation of the rotating plate 110.

The aligning means 210 operated by the controller 200 rotates the conveying shaft 2131 by the operation of the conveying motor 2132 and rotates the conveying shaft 2131 to the first and second positions The alignment jigs 211 and 212 move in the direction of approaching the valve spring S and the side portions of the valve springs are inserted into the first and second grooves 2111 and 2121 formed in the first and second alignment jigs 211 and 212, The valve spring is guided by the first groove 2111 and the second groove 2121 having the V-shaped structure and moved to be positioned at the center of the first groove 2111 and the second groove 2121 The valve springs are aligned.

When the position of the valve spring is aligned through this process, the first and second positioning jigs 211 and 212 are separated from the valve spring by the reverse rotation of the transfer shaft 2131.

The control unit 200 actuates the elevating motor 184 to lower the pressure block 160 so that the load cell 170 and the displacement sensor 190 are preloaded from the load cell 170, The pressure block 160 is lowered until a value is detected.

On the other hand, when a preset load value is detected from the load cell 170, the controller 200 operates the elevating motor 184 in the reverse direction to gradually raise the pressing block 160.

When the load value from the load cell 170 is detected as 0 in the process of gradually increasing the pressure block 160 as described above, the displacement value of the corresponding position is set to 0. In this way, the load cell 170 and the displacement sensor 190 Initialization is completed.

The controller 200 operates the elevating motor 184 to lower the pressure block 160. When the preset primary displacement value is detected by the displacement sensor 190 The pressure block 160 is lowered to compress the valve spring.

When the preset primary displacement value is detected from the displacement sensor 190 during the compression of the valve spring, the controller 200 stops the elevating motor 184 and sets the load value detected from the load cell 170 to the first And stored as a load value for the displacement.

Step S140 is a step of photographing the side surface image of the valve spring with the camera 150 in order to measure the number of turns of the line contact with respect to the primary displacement in a state where the valve spring is compressed by the primary displacement.

That is, the controller 200 operates the rotation driving motor 131 to rotate the rotation plate 110 so that the valve spring is rotated by 360 °, and the rotation drive motor 131 .

In addition, the controller 200 operates the camera 150 every time the rotation plate 110 and the valve spring rotate in the unit of an angle to photograph an image of the side surface of the valve spring. When the valve spring is rotated 360 degrees, 150 will take dozens to hundreds of images.

The controller 200 analyzes the photographed image using the camera 150 to measure the number of turns of the line for the primary displacement. Meanwhile, the process of measuring the number of wire-to-wire contacts through the analysis of the image will be described in detail in the process of step S170.

A center light 120 and a back light 140 are used to obtain an image in which the valve spring and the background are clearly distinguished by the shade in the photographing process using the camera 150. [

That is, the center illumination 120 emits light in the direction of the camera 150 from the inside of the valve spring, so that the shaded portions of the volumes of the valve springs positioned immediately in front of the camera 150 are clearly separated from the camera 150 150).

In addition, the backlight 140 emits light in the direction of the valve spring from the rear of the valve spring, thereby helping the camera 150 acquire an image in which the shade of the entire contour of the valve spring is clearly divided.

In step S150, the controller 200 operates the elevating motor 184 to further lower the pressing block 160. When the preset secondary displacement value is detected by the displacement sensor 190, the pressure block 160 is further lowered to compress the valve spring.

When a predetermined secondary displacement value is detected from the displacement sensor 190 during the compression of the valve spring, the controller 200 stops the elevating motor 184 and sets the load value detected from the load cell 170 to the second And stored as a load value for the displacement.

In step S160, the image of the side surface of the valve spring is photographed by the camera 150 while rotating the valve spring compressed by the secondary displacement by 360 degrees. In the same manner as in step S140 described above, the valve spring is rotated The center light 120 and the back light 140 are used in this photographing process.

In step S170, the controller 200 analyzes the images photographed in steps S140 and S160, and measures the number of turns of the line for the primary displacement and the number of turns of the line for the secondary displacement.

For reference, the number of turns of the line-to-line contact is the number of turns at the point where the distance between two adjacent lines from the upper end of the valve spring is 0.05 mm.

FIG. 8 shows an image of an image photographed by a camera in pixels in black and white.

For example, when the image taken by the camera 150 is displayed as black and white pixels, an image as shown in FIG. 8 can be obtained. By using the brightness of the pixels in the processed image, Can be obtained.

That is, since the pixel located at the point where the brightness of the pixel changes from white to black corresponds to the pixel constituting the outline of the valve spring. It is possible to detect pixels constituting the outline of the valve spring in such a manner as to detect pixels satisfying these conditions.

9 is an exemplary view showing a process of detecting an upper end of a valve spring.

The controller 200 sets the central region of the image partitioned by the center illumination 120 to the inspection region A and sets the pixel located at the point where the brightness of the pixel located in the inspection region A changes from white to black It is possible to detect the points located at the outline of the valve spring and to detect the point located at the upper end S1 by analyzing the coordinates of the detected point.

That is, at the boundary of the upper end S1, an abrupt change occurs in the Y-axis coordinate value, so that the upper end S1 can be detected by finding a coordinate value in which the abrupt change of the Y-axis coordinate value is detected.

In this way, the upper end of the valve spring is detected, and the image of the upper end of the valve spring closest to the center of the image is detected. The rotation angle of the rotation plate 110 when the image is captured is detected by the rotation driving motor 131 Detect using an encoder or a separate rotation angle sensor.

Thereafter, the controller 200 detects a distance between the uppermost and the lower right of the image, and detects a point closest to 0.05 mm between the two.

That is, the controller 200 checks the brightness of the pixel from the top to the bottom of the inspection area A set at the center of the image, recognizes the point where the brightness of the pixel changes from white to black, , And finds a point that changes from black to white, and recognizes it as a point located at the bottom contour of the volume.

Accordingly, the brightness of the pixel is analyzed from the top to the bottom of the image on the basis of an arbitrary vertical line L positioned at the center of the screen, so that a point P1 located on the lower contour of the upper portion and a portion located on the upper contour of the lower portion And detects an image whose distance d between the two detected points P1 and P2 is closest to 0.05 mm and detects the angle at which the rotating plate 110 is rotated at the time of photographing the image, It is detected using an encoder of the motor 131 or a separate rotation angle sensor.

When the rotation angles of the two images are detected through the above process, the relative angle (alpha) between the upper end and the 0.05 mm point can be calculated. Using the calculated angle (alpha) and the outer diameter information of the valve spring, .

Meanwhile, various image analysis techniques have been used due to the development of image analysis technology, and the controller 200 of the present invention is also capable of performing image analysis using a known image analysis technique , It is possible to detect the upper end and the 0.05 mm point.

Meanwhile, the method of measuring a valve spring characteristic according to the present invention may further include a step (S180) of detecting the close contact of the valve spring.

When the controller 200 completes the photographing of the valve spring compressed to the second displacement, the controller 160 further lowers the pressure block 160 to further compress the valve spring, and the load value detected by the load cell 170 and the displacement sensor 190, when the spring constant value calculated from the displacement value reaches a predetermined reference constant value, the lowering of the pressing block 160 is stopped, and the displacement value at this time is detected as the close contact of the valve spring.

As described above, according to the present invention, not only the valve spring is compressed to detect the load value for the first and second displacements, but also the image is captured while rotating the compressed valve spring, It is possible to automatically detect the number of winding lines for the line, and it is possible to acquire the characteristic information of the valve spring quickly and accurately.

For reference, FIG. 10 shows an image showing a state in which characteristic information detected through the above process is displayed on a screen through a display device.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Description of the Related Art
110: spindle 120: center light
121: light emitting unit 130: rotation driving means
140: Backlight 150: Camera
160: Press block 170: Load cell
180: Shanghai transfer mechanism 181: Lift block
182: Column 183: Feed screw
184: lift motor 190: displacement sensor
200: controller 210: alignment means
211: first positioning jig 2111: first groove
212: second positioning jig 2121: second groove
213: moving means 2131:
2132: Feeding motor

Claims (10)

A rotating plate (110) placed on the upper surface of the valve spring in a vertically erected structure and rotating together with the valve spring;
A center light 120 for emitting light from inside the valve spring installed on the rotary plate 110;
Rotation driving means 130 connected to the rotation plate 110 to rotate the rotation plate 110;
A backlight 140 for emitting light toward the valve spring from one side of the valve spring installed on the rotation plate 110;
A camera (150) arranged to face the backlight (140) and the valve spring to photograph a side image of a valve spring rotated by a predetermined angle unit by the rotation plate (110);
A pressing block 160 disposed at a vertical upper portion of the rotary plate 110 and spaced apart from the rotary plate 110 to pressurize and compress the valve spring placed on the rotary plate 110 while moving in the vertical direction;
A load cell 170 for detecting the magnitude of a load applied to the valve spring through the pressing block 160;
A vertical transfer mechanism 180 installed with the pressing block 160 and the load cell 170 for moving the pressing block 160 up and down;
A displacement sensor 190 for detecting position information of the pressing block 160 when the pressing block 160 moves up and down;
A load value for a primary displacement of the corresponding valve spring and a load value for a secondary displacement are obtained from signals transmitted from the load cell 170 and the displacement sensor 190, A controller (200) for detecting the number of turns and the contact height between the first and second displacements of the corresponding valve springs; And
And alignment means (210) for aligning the valve springs so that the center of the valve springs placed on the rotation plate (110) coincides with the center of the rotation plate (110)
The alignment means (210)
A first groove 2111 of a V-shaped structure which is arranged to move in a direction approaching or away from the valve spring on one side of the valve spring placed on the rotary plate 110, and a side portion of the valve spring is inserted into a side surface facing the valve spring, A first positioning jig 211 formed with the first positioning jig 211;
A V-shaped structure having a structure in which a valve spring placed on the rotary plate 110 is opposed to the first positioning jig 211 and a side portion of the valve spring is inserted into a side surface facing the valve spring, A second positioning jig 212 having two grooves 2121 formed therein; And
And moving means 213 for moving the first and second aligning jigs 211 and 212 so that the first and second aligning jigs 211 and 212 move toward or away from each other Wherein the valve spring is a valve spring. delete delete The apparatus according to claim 1, wherein the moving means (213)
A left-handed thread passing through the first and second aligning jigs 211 and 212 and engaged with the first aligning jig 211 to guide movement of the first aligning jig 211 is formed on one side, A conveying shaft 2131 formed on the other side of the right screw that is engaged with the aligning jig 212 to induce the movement of the second aligning jig 212; And
And a conveying motor (2132) connected to the conveying shaft (2131) for rotating the conveying shaft (2131). The method according to claim 1,
The center light 120 is installed to be inserted into the central portion of the valve spring through the rotating plate 110,
And a light diffusing part (121) having a slit structure extending in a vertical direction is formed on a side part facing the camera (150). [2] The apparatus according to claim 1,
A lift block 181 in which the load cell 170 and the press block 160 are installed;
At least one column 182 coupled with the lift block 181 to support the vertical movement of the lift block 181;
A conveying screw 183 installed vertically in the column 182 or coupled to the elevating block 181;
And an elevating motor (184) connected to the conveying screw (183) to rotate the conveying screw (183). A step S110 of vertically erecting a valve spring on the upper surface of the rotary plate 110;
A step S120 of detecting a position where a load value is 0 by contacting a valve spring placed on the rotary plate 110 with a pressing block 160 and setting a displacement value of the position to 0;
After step S120, the pressure block 160 is lowered so that the valve spring is compressed by a predetermined primary displacement, and the load value detected by the load cell 170 at the primary displacement position is detected as a load value with respect to the primary displacement Step S130;
After step S130, the step S140 of photographing the side image of the valve spring with the camera 150 while operating the rotation plate 110 to rotate the valve spring by a predetermined angle unit;
After step S140, the pressure block 160 is lowered so that the valve spring is compressed by a predetermined secondary displacement, and the load value detected by the load cell 170 at the secondary displacement position is detected as a load value with respect to the secondary displacement Step S150;
After step S150, the step S160 of photographing the side image of the valve spring with the camera 150 while operating the rotation plate 110 to rotate the valve spring by a preset angle unit (S160); And
The controller 200 analyzes the image photographed in the step S140 and the image photographed in the step S160 to detect the number of turns of the line for the primary displacement of the valve spring and the number of turns of the line for the secondary displacement S170). ≪ / RTI > The method of claim 7,
After the step S160, the pressure block 160 is further lowered to compress the valve spring. The spring constant value calculated from the load value detected by the load cell 170 and the displacement value detected by the displacement sensor 190 is set in advance (S180) of detecting a displacement value when the reference constant value is reached as a close contact of the valve spring (S180). The method of claim 7,
The number of turns of the line contact with respect to the primary displacement and the number of turns of the line with respect to the secondary displacement,
The upper end S1 of the valve spring is detected and a point having a distance of 0.05 mm between the two adjacent springs of the valve spring is detected. Then, the upper end point and the relative angle? And calculating the number of turns of the line contact from the outer diameter value. The method of claim 7,
In step S140 and step S160, the central name 120 inserted into the center of the valve spring is used to divert the light from the inside of the valve spring toward the camera 150, and the camera 150, Wherein an image of the valve spring is photographed in a state in which the backlight (140) arranged to face the camera (150) emits illumination in the direction of the camera (150).

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