JP4883326B2 - Automatic flaw detector - Google Patents

Description

  The present invention relates to an automatic flaw detection apparatus that automatically detects the head of a workpiece having a cylindrical surface such as a bolt, a pin, and a rivet using eddy currents.

One of the methods for detecting minute flaws (defects) generated on the surface of a metal material is an eddy current flaw detection method using eddy current. This eddy current flaw detection method pays attention to the fact that when an AC magnetic field is applied to the workpiece to be inspected, the eddy current generated on the surface of the workpiece due to electromagnetic induction changes depending on the presence or absence of flaws. It detects the presence or absence of scratches. 2. Description of the Related Art An automatic flaw detection apparatus is known that uses this eddy current flaw detection method to automatically flaw the head of a work having a cylindrical surface such as a bolt or a pin and sort it into a non-defective product and a defective product.
As this conventional technique, for example, in (Patent Document 1), “a rotation mechanism that rotates a bolt around the center of a screw portion and an axial contact with the peripheral surface of the head of the bolt so that an abnormality occurs when the bolt rotates. And a high-strength bolt abnormality detecting device including a flaw detection probe for detecting the “flaw detection probe”. Further, (Patent Document 1) states that “the flaw detection probe is always in contact with the bolt head circumferential surface, so that the displacement of the bolt head diameter is detected according to the movement of the flaw detection probe, and whether there is any eccentricity of the bolt head, etc. Can be detected ".
(Patent Document 2) states that “a rotating disk having a notch that accommodates a workpiece having a cylindrical surface at a constant pitch in the circumferential direction, and an intermittent rotating device that intermittently rotates the rotating disk by the pitch. An automatic flaw detection apparatus comprising: a work rotation device that rotates the work within the notch; and a flaw detection probe that moves forward and backward in conjunction with the rotation of the rotary disk and approaches the head of the work when moving forward. '' It is disclosed.
Japanese Utility Model Publication No. 56-153855 Japanese Utility Model Publication No. 61-24930

However, the above conventional techniques have the following problems.
(1) The technique disclosed in (Patent Document 1) is capable of detecting the displacement of the bolt head diameter according to the movement of the flaw detection probe by always bringing the flaw detection probe into contact with the bolt head peripheral surface. Since the bolt heads rub against each other, the tip of the flaw detection probe is likely to be worn or damaged, resulting in lack of durability.
(2) Although the diameters of workpieces and heads vary (there is a head diameter tolerance of -0.4 to 0.8 mm), the technique disclosed in (Patent Document 2) uses flaw detection. Since the advance amount of the probe is fixed by a cam, there is a problem that the gap amount between the head and the flaw detection probe varies from workpiece to workpiece. The gap amount between the head and the flaw detection probe is generally maintained at 0.3 to 0.7 mm, but the smaller the S / N ratio, the lower the S / N ratio. There is a tendency that the detection accuracy decreases. For this reason, it is desirable to set the advancement amount of the flaw detection probe so that the flaw detection probe is as close as possible to the head. However, if the advancement amount of the flaw detection probe is increased to bring the flaw detection probe closer to the head, the diameter of the head When a large workpiece comes in, the flaw detection probe may collide with the head, and the flaw detection probe may be damaged or the head of the work may be damaged. In order to prevent this, if the amount of advancement of the flaw detection probe is reduced and the flaw detection probe is moved away from the head, there arises a problem that the S / N ratio is lowered and the detection accuracy is lowered. As described above, there is a problem that it is difficult to satisfy both the prevention of damage to the flaw detection probe and the workpiece head and the improvement of detection accuracy at the same time. If priority is given to preventing damage to the flaw detection probe and the workpiece head, there is a problem that the detection accuracy is sacrificed and the yield of the workpiece is lowered. Further, if the flaw detection time per workpiece is increased in order to increase the detection accuracy, there is a problem in that productivity decreases because the number of flaws that can be flawed per unit time decreases.

  The present invention solves the above-described conventional problems, and ensures a certain gap amount between the head and the flaw detection probe, and simultaneously satisfies the prevention of damage to the flaw detection probe and the work head and the improvement of detection accuracy. An object of the present invention is to provide an automatic flaw detector capable of ensuring high detection accuracy without reducing the flaw-detectable quantity per unit time.

In order to solve the above conventional problems, the automatic flaw detection apparatus of the present invention has the following configuration.
The automatic flaw detection apparatus according to claim 1 of the present invention includes a horizontal disk having a receiving portion for storing a workpiece having a cylindrical surface at a constant pitch along a circumferential direction, and the disk is intermittently provided at the pitch. Automatic flaw detection comprising: an intermittent rotation device that rotates; a workpiece rotation device that rotates the workpiece within the housing portion; and a flaw detection probe that moves forward and backward in conjunction with the rotation of the disk and approaches the head of the workpiece when moving forward A device,
A guide portion that protrudes forward from the tip of the flaw detection probe to a side portion of the flaw detection probe, and a convex portion that is formed on a straight line connecting the central axis of the upper surface of the disk and each of the accommodating portions. And a roller that rolls on the upper surface of the disk and the convex portion as the disk rotates, and an end of the work is pushed up when the work is rotated in the receiving portion. A workpiece push-up portion that separates the seating surface of the head from the upper surface of the housing portion, and the vertical movement of the roller when rolling on the disk and the upper surface of the convex portion is up and down of the workpiece push-up portion. It has a structure that is linked to the movement .
With this configuration, the following effects can be obtained.
(1) Since the guide part protrudes from the tip of the flaw detection probe, when the guide part comes into contact with the head, the guide part is a predetermined position where the flaw detection probe is retracted from the guide part with reference to the surface of the head. Therefore, even if the head diameter varies, a certain gap amount can be secured between the head and the flaw detection probe. For this reason, it is possible to satisfy both the prevention of breakage of the flaw detection probe and the workpiece head and the improvement of the detection accuracy at the same time, and it is possible to ensure high detection accuracy without reducing the quantity capable of flaw detection per unit time.
(2) A convex portion is formed on a straight line connecting the drive shaft on the upper surface of the disk and each housing portion, and the roller rolls on the upper surface and the convex portion of the disk as the disk rotates. Due to the vertical movement caused by the movement, the workpiece push-up portion is surely moved up and down by a fixed amount at the flaw detection position, so that the workpiece seating surface can be reliably separated from the upper surface of the housing portion at the flaw detection position.
(3) When there is a slit or protrusion on the seat surface of the workpiece head (for example, for bolt loosening prevention), if the workpiece is rotated in the accommodating portion, the upper surface of the accommodating portion and the seat surface of the head As a result of rubbing, the workpiece cannot be stably rotated, and the upper surface of the housing part may be worn out early due to friction or the seat surface may be damaged. Since the workpiece push-up portion is provided below the disk, when the workpiece is rotated in the housing portion, the end of the workpiece can be pushed up so that the seating surface of the head can be separated from the upper surface of the housing portion. Can be stably rotated, wear of the upper surface of the housing portion can be prevented, and damage to the seating surface can be prevented.
(4) Since the work is rotated around the end of the work having a small area by pushing up the end of the work by the work push-up part, since the friction is small, the work can be rotated with a small amount of energy. Excellent in properties.

Here, as a work, if it has a cylindrical surface and has a head having a diameter larger than the diameter of the cylindrical surface, a bolt, a pin, a rivet, etc. can be used as a target for flaw detection without any particular limitation. . The head is not limited to a circular outer shape, but can also be a flaw detection target having a polygonal shape such as an octagon.
As a flaw detection probe, a coil-wound yoke is provided at the tip, an AC magnetic field is applied to the head of the work, and an eddy current generated in the head due to the AC magnetic field is detected via the coil. A flaw detector is used.

The guide portion can be used without particular limitation as long as it is provided on both or one side of the flaw detection probe so as to protrude forward from the tip of the flaw detection probe. What was formed in various shapes, such as a shape, a rod shape, and a lump shape, can be used. In particular, those having a rounded tip are preferably used. This is to prevent the head from being damaged when contacting the head of the workpiece.
The material of the guide portion can be used without particular limitation as long as it is nonmagnetic, such as a metal such as austenitic stainless steel or a synthetic resin such as POM.
The amount of protrusion of the guide part with respect to the flaw detection probe, the horizontal distance between the guide part and the flaw detection probe, and the distance between the guide parts when a plurality of guide parts are arranged are appropriately set according to the center value of the workpiece diameter. The gap amount between the flaw detection probe and the head of the workpiece is set to about 0.3 to 0.7 mm when the flaw detection probe advances. This is to prevent the flaw detection probe from colliding with the workpiece and to ensure detection sensitivity of the eddy current. The protruding amount and interval can be changed by moving the flaw detection probe and the guide unit using a feed screw or the like. Further, by changing the unit incorporating the flaw detection probe and the guide unit, the setting of the amount of protrusion and the interval can be changed.

An automatic flaw detection apparatus according to a second aspect of the present invention is the automatic flaw detection apparatus according to the first aspect, wherein the front side in the rotational direction is directly above or directly below the accommodating portion formed in a cutout shape around the disk. A retraction portion that is formed at the same pitch and rotates together with the disk, and a retraction portion touching portion that is disposed in front of the flaw detection probe at substantially the same height as the retraction portion. The evacuation part is forcibly retracted by causing the retracting part to touch the part.
With this configuration, in addition to the operation obtained in the first aspect, the following operation can be obtained.
(1) Since the guide part protrudes from the tip of the flaw detection probe, when the guide part comes into contact with the head, the guide part is a predetermined position where the flaw detection probe is retracted from the guide part with reference to the surface of the head. Therefore, even if the head diameter varies, a certain gap amount can be secured between the head and the flaw detection probe. For this reason, it is possible to satisfy both the prevention of breakage of the flaw detection probe and the workpiece head and the improvement of the detection accuracy at the same time, and it is possible to ensure high detection accuracy without reducing the quantity capable of flaw detection per unit time.
(2) The disk rotates intermittently. During normal operation, the flaw detection probe moves backward when the disk rotates, and the flaw detection probe moves forward when the disk stops. If any abnormality occurs, the flaw detection probe may not retreat even if the disk starts to rotate, and the work housed in the disk housing part may collide with the guide part, possibly damaging the guide part or the flaw detection probe. However, since the retracting part that rotates with the disk is provided, when the flaw detection probe does not move backward, the retracting part is brought into contact with the retracting part touching part disposed in front of the flaw detection probe to force the flaw detection probe. Therefore, even if an abnormality occurs such that the flaw detection probe does not retreat even when the disk starts to rotate, it is possible to prevent the guide portion or flaw detection probe from touching the workpiece and being damaged.

According to a third aspect of the present invention, there is provided the automatic flaw detection device according to the first aspect, wherein the automatic flaw detection device is connected to the intermittent rotation device and rotates the disk, and is arranged to be freely rotatable on the drive shaft. A rotating roller that rotates the workpiece from the side direction, and a pair of left and right auxiliary rollers that are horizontally disposed at substantially the same height as the rotating roller and press the shaft portion of the workpiece against the rotating roller. It has the composition which is.
With this configuration, in addition to the operation obtained in the first aspect, the following operation can be obtained.
(1) Since the guide part protrudes from the tip of the flaw detection probe, when the guide part comes into contact with the head, the guide part is a predetermined position where the flaw detection probe is retracted from the guide part with reference to the surface of the head. Therefore, even if the head diameter varies, a certain gap amount can be secured between the head and the flaw detection probe. For this reason, it is possible to satisfy both the prevention of breakage of the flaw detection probe and the workpiece head and the improvement of the detection accuracy at the same time, and it is possible to ensure high detection accuracy without reducing the quantity capable of flaw detection per unit time.
(2) As the flaw detection probe moves back and forth, the auxiliary roller moves back and forth, the advanced auxiliary roller abuts against the shaft portion of the work suspended by the housing portion, presses the shaft portion against the rotating roller, Is rotated between the auxiliary roller and the rotating roller, the cycle time can be shortened and high-speed inspection is possible.

A fourth aspect of the present invention is the automatic flaw detection apparatus according to any one of the first to third aspects, wherein the guide portion is a roller that is rotatable in the horizontal direction. ing.
According to this configuration, in addition to the action obtained in any one of claims 1 to 3, the following action is obtained.
(1) When the guide part is a roller that can rotate in the horizontal direction, when the work is rotated in the housing part, the roller also rotates as the work head rotates. Scratches that can be rubbed are less likely to occur, and the high quality can be maintained without impairing the aesthetics of the workpiece.
(2) The flaw detection probe that is close to the workpiece head during advancement moves back and forth in conjunction with the rotation of the disk, but if an instantaneous power failure occurs during operation, the advanced flaw detection probe must not retreat at the determined timing. There is. If the disk rotates without the flaw detection probe retreating, the work may hit the flaw detection probe or the guide portion, and the flaw detection probe or the like may be damaged. In order to prevent this, if the flaw detection probe and the guide part do not retreat at a predetermined timing, they can be forcibly (mechanically) retreated, but the guide part is formed by a roller, so the guide part at the time of retraction. Even if the (roller) rubs against the head of the workpiece, the roller rotates so that the head is not easily scratched, and since there is little friction with the head, the roller can be moved backward smoothly.

As described above, according to the automatic flaw detection apparatus of the present invention, the following advantageous effects can be obtained.
According to the invention of claim 1,
(1) When the guide part comes into contact with the head, the flaw detection probe is disposed at a predetermined position with respect to the surface of the head as a reference, so even if the head diameter varies, the head A certain gap amount can be secured between the probe and the flaw detection probe, and the flaw prevention probe and workpiece head can be prevented from being damaged and the detection accuracy can be improved at the same time, without reducing the number of flaws that can be detected per unit time. It is possible to provide an automatic flaw detection apparatus that can ensure high detection accuracy.
(2) When the workpiece is rotated in the accommodating portion, the end of the workpiece is pushed up so that the back surface of the head can be separated from the upper surface of the accommodating portion, and the workpiece can be rotated stably and the upper surface of the accommodating portion can be worn away. It is possible to provide an automatic flaw detector that can prevent the workpiece from being scratched.
(3) Since the work is rotated around the end of the work having a small area by pushing the work's end up by the work push-up part, since the friction is small, the work can be rotated with a small amount of energy. It is possible to provide an automatic flaw detection apparatus with excellent properties.

According to invention of Claim 2, in addition to the effect of Claim 1,
(1) When the guide part comes into contact with the head, the flaw detection probe is disposed at a predetermined position with respect to the surface of the head as a reference, so even if the head diameter varies, the head A certain gap amount can be secured between the probe and the flaw detection probe, and the flaw prevention probe and workpiece head can be prevented from being damaged and the detection accuracy can be improved at the same time, without reducing the number of flaws that can be detected per unit time. It is possible to provide an automatic flaw detection apparatus that can ensure high detection accuracy.
(2) An automatic flaw detection device capable of forcibly withdrawing the guide part and flaw detection probe to prevent fatal damage that breaks them even if an abnormality occurs such that the flaw detection probe does not retreat even when the disk starts to rotate. Can provide.

According to invention of Claim 3, in addition to the effect of Claim 1,
(1) When the guide part comes into contact with the head, the flaw detection probe is disposed at a predetermined position with respect to the surface of the head as a reference, so even if the head diameter varies, the head A certain gap amount can be secured between the probe and the flaw detection probe, and the flaw prevention probe and workpiece head can be prevented from being damaged and the detection accuracy can be improved at the same time, without reducing the number of flaws that can be detected per unit time. It is possible to provide an automatic flaw detector capable of ensuring high detection accuracy.
(2) As the flaw detection probe moves back and forth, the auxiliary roller moves back and forth, the advanced auxiliary roller abuts against the shaft portion of the work suspended by the housing portion, presses the shaft portion against the rotating roller, Is rotated between the auxiliary roller and the rotating roller, so that an automatic flaw detector capable of shortening the cycle time and enabling high-speed inspection can be provided.

According to the invention of claim 4, in addition to the effect of any one of claims 1 to 3,
(1) Since the roller also rotates as the workpiece head rotates, an automatic flaw detector is provided that is unlikely to cause scratches caused by rubbing the guide portion against the side surface of the workpiece, and that maintains the high quality without impairing the aesthetics of the workpiece. it can.
(2) When the flaw detection probe and the guide part are retracted, the guide part is formed by a roller. Therefore, even if the guide part (roller) rubs against the head of the workpiece during the retraction, the roller rotates and the head is damaged. Therefore, it is possible to provide an automatic flaw detection apparatus that can maintain high quality without being damaged, can maintain the high quality of the work, and can be smoothly moved back because there is little friction with the head, thereby preventing fatal damage to the apparatus.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a plan view of a main part of the automatic flaw detector according to the first embodiment, FIG. 2 is a front view of a workpiece height adjustment unit of the automatic flaw detector, and FIG. 3 is a front view of a flaw detector of the automatic flaw detector. 4 is a side view of the main part of the flaw detection part, and FIG. 5 is a plan view of the main part of the flaw detection part. FIG. 1 is a plan view showing a state in which the retracting portion fixing plate disposed above the disk is removed.
In FIG. 1, 1 is an automatic flaw detector according to Embodiment 1 of the present invention, 2 is a drive shaft connected to an intermittent rotation device 7 described later, and 3 is a disk fixed to the drive shaft 2 and disposed horizontally. In this embodiment, it rotates intermittently by 45 ° in the direction indicated by the arrow (counterclockwise). Reference numeral 4 denotes a housing portion formed in a notch shape at a constant pitch along the circumferential direction of the disk 3, and 5 denotes a protruding shape on a straight line connecting the drive shaft 2 on the top surface of the disk 3 and each housing portion 4. It is the formed convex part. Reference numeral 20 denotes a workpiece height adjusting unit which will be described in detail later, and reference numeral 40 denotes a flaw detection unit which will be described in detail later.
The automatic flaw detector 1 in the present embodiment supplies workpieces such as bolts, pins, rivets, etc. one by one to the accommodating portion 4 of the disk 3 using a parts feeder (not shown), and by an electrical signal from a controller (not shown), The work that has reached the position of the flaw detection section 40 (flaw detection position) by interlocking the operations of the disk 3, the work height adjustment section 20, and the flaw detection section 40 and the disk 3 intermittently carrying the supplied work counterclockwise. After the flaw detection, the workpiece after flaw detection that has passed through the position of the flaw detection section 40 is sorted into a defective product and a non-defective product.

In FIG. 2, 6 is a base of the automatic flaw detector 1, 7 is an intermittent rotation device that is disposed on the base 6 and intermittently rotates the drive shaft 2, and 8 is disposed on the drive shaft 2 above the disk 3. The retracting portion fixing plate 9 is a retracting portion formed of a roller or the like and fixed to the end of the retracting portion fixing plate 8. The retracting portions 9 are arranged at the same pitch as the accommodating portions 4, and the position where each retracting portion 9 is fixed to the retracting portion fixing plate 8 is slightly above the directly above the accommodating portion 4 formed in the disk 3. It is the front side in the rotation direction. W is a workpiece such as a bolt, pin, rivet, H is a head formed with a circular or polygonal outer shape of the workpiece W, and J is a shaft portion of the workpiece W. The workpiece W is accommodated in the accommodating portion 4 such that the head H is hooked on the accommodating portion 4 of the disk 3 and the shaft portion J is suspended from the accommodating portion 4.
Reference numeral 10 denotes a rotating roller driving device arranged in parallel with the intermittent rotating device 7 on the base 6, 11 a pulley arranged rotatably by the rotating roller driving device 10, 12 a pulley in which the drive shaft 2 is loosely inserted, 13 Is a belt hung between pulleys 11 and 12, 14 is a rotating roller fixing portion fixed to the lower end portion of the pulley 12 so as to be freely rotatable on the drive shaft 2, and 15 is a rotating roller formed of urethane resin or the like. The rotating roller is fixed to the upper side of the fixed portion 14. In the present embodiment, the rotating roller driving device 10, the pulleys 11 and 12, the belt 13, the rotating roller fixing portion 14, and the rotating roller 15 constitute a work rotating device.
20 is a workpiece height adjusting unit, 21 is a vertical guide unit such as a rail or shaft suspended from the base 6, 22 is an upper slider slidably disposed on the upper side of the vertical guide unit 21, and 23 is An upper fixing plate having one end fixed to the upper slider 22 and the other end disposed upward of the disk 3, 24 a roller fixing portion disposed on the other end of the upper fixing plate 23, and 25 a roller A roller that is fixed to the fixing portion 24 and is positioned on a straight line connecting the flaw detection position (advance position of the flaw detection probe 72 described later) and the drive shaft 2 and rolls on the upper surface of the disk 3 and the convex portion 5 as the disk 3 rotates. 26 is a through-hole penetrating the upper fixing plate 23, 27 is an adjustment shaft that is fixed so as not to move up and down with respect to the upper fixing plate 23, and is inserted into the through-hole 26 so as to be rotatable around its axis. 28 is a handle fixed to the upper end of the adjustment shaft 27, 29 is an adjustment shaft 7 is a screw part formed on the lower side, 30 is a lower slider slidably disposed on the lower side of the vertical guide part 21, and 31 is fixed to the lower slider 30 at one end and a disk at the other end. 3, a lower fixing plate 32 disposed downward, and a through hole 33 formed in the inner wall with a threaded portion that engages with the threaded portion 29 of the adjusting shaft 27 on the inner wall. A workpiece push-up portion 34 projecting from the other end portion of the lower fixing plate 31 toward the accommodating portion 4 of the disc 3 (accommodating portion 4 where the flaw detection portion 40 described later advances) is fixed to a support body (not shown). A work holding and fixing portion 35 disposed above the disk 3 and immediately above the workpiece pushing-up portion 33 is fixed to the work holding and fixing portion 34 by a spring or the like and is urged downward to form a substantially hemispherical lower end surface. It is a work holding part.
In the automatic flaw detector 1 according to the present embodiment, the interval between the upper slider 22 and the lower slider 30 is arbitrarily set along the vertical guide portion 21 by rotating the handle 28 and the adjusting shaft 27 and the screw portion 29. In other words, the upper fixing plate 23 and the lower fixing plate 31 are connected and fixed at fixed intervals by the screw portion 29. The interval between the upper slider 22 and the lower slider 30 is appropriately set according to the length of the shaft portion J of the workpiece W.
The work pressing part 35 is used for pressing the work W pushed up by the work pushing-up part 33 so that the head H does not come off from a flaw-detectable region of the flaw detection probe 72 described later. For this reason, the workpiece pressing portion 35 is disposed at the upper limit height of the flaw-detectable area of the flaw detection probe 72 described later.

In FIG. 3, 40 is a flaw detection part, 41 is a linear motion guide part such as a rail disposed on the base 6, 42 is a slider slidably disposed on the linear motion guide part 41, and 43 is a slider 42. A front side support portion that is suspended from the upper surface substantially perpendicular to the longitudinal direction of the slider 42, 44 is a rear side support portion that is suspended from the upper surface of the slider 42 substantially parallel to the longitudinal direction of the slider 42, and 45 is a linear motion guide. A fixed plate 46 fixed to the rear end of the portion 41 substantially perpendicularly to the longitudinal direction of the linear motion guide portion 41, and a through hole formed in the fixed plate 45 fixed so as not to move back and forth with respect to the fixed plate 45 An adjustment shaft that is rotatably inserted around the shaft center, 47 is a handle fixed to the rear end portion of the adjustment shaft 46, 48 is a screw portion formed on the front side of the adjustment shaft 46, and 49 is a front side. The support portion 43 is penetrated and the inner wall is screwed with the screw portion 48 of the adjustment shaft 46. A through-hole terminal part is formed. By rotating the handle 47, the slider 42 can be fixed at an arbitrary position by changing the distance between the front support part 43 and the fixing plate 45, and the front and rear positions of the entire flaw detection part 40 can be set to the outer diameter of the work W. Can be adjusted according to.
Reference numeral 50 denotes a flaw detection part support plate disposed above the front support part 43 and the rear support part 44; 51, a linear motion guide part such as a rail disposed on the upper front side of the flaw detection part support plate 50; A rotary drive unit such as a motor disposed on the rear side of the upper surface of the part support plate 50, a rear shaft part 53 formed rotatably by the rotary drive part 52 and penetrating the flaw detection part support plate 50, and 54 A pulley fixed to the side shaft portion 53, 55 is a pulley disposed on the front side of the pulley 54, 56 is a belt hung between the pulleys 54 and 55, 57 is a pulley 55 fixed to the lower end portion, and supports the flaw detection portion. A front shaft portion penetrating the plate 50, 58 is a crank pin eccentrically disposed on the upper surface of the front shaft portion 57, 59 is a crank arm with the crank pin 58 connected to one end, and 60 is the other crank arm 59. The connecting pin 61 is connected to the end. Disposed on the side in the linear motion guide unit 51 is slidably disposed a slider.

3 to 5, 62 is a flaw detection support portion disposed on the upper surface of the slider 61, 63 is an arm portion disposed on the front surface of the flaw detection support portion 62, and 64 is fixed to the arm portion 63 and fixed to the rotating roller 15. A pair of left and right auxiliary rollers disposed horizontally at substantially the same height. When the slider 61 advances, the auxiliary roller 64 comes into contact with the shaft portion J of the work W, which is housed and hung in the housing portion 4 of the disk 3, and presses the shaft portion J against the rotating roller 15.
65 is a flaw detection probe support portion disposed on the upper surface of the flaw detection support portion 62, 66 is a shaft holder extending above the front side of the flaw detection probe support portion 65, 67 is a shaft inserted in the shaft holder 66, and 68 is An outer cylinder in which the shaft 67 is slidably inserted and a front end portion is fixed to the shaft holder 66, 69 is a substantially U-shaped, bottom portion is fixed to the front end portion of the shaft 67, and an overhang portion projecting forward, 70 Is an elastic body such as a spring that is inserted between the shaft holder 66 and the overhanging portion 69 and urges the overhanging portion 69 forward, and 71 is disposed on the lower surface of the overhanging portion 69. A substantially rectangular tube-shaped flaw detection probe holding portion, 72 is a flaw detection probe held in the flaw detection probe holding portion 71, and 73 is a guide disposed on the side of the flaw detection probe 72 by protruding forward from the tip of the flaw detection probe 72. Part There, in the present embodiment, the guide portion 73 is rotatable roller disposed horizontal direction on both sides of the flaw detection probe 72. Reference numeral 74 denotes a retracting portion touching portion which is formed of a roller or the like and is disposed horizontally at substantially the same height as the retracting portion 9 on the upper surface front side of the overhanging portion 69.

The operation of the automatic flaw detector according to Embodiment 1 of the present invention configured as described above will be described below.
When the intermittent rotation device 7 is driven by an electrical signal from a control device (not shown) and the disk 3 rotates intermittently, workpieces W are supplied one by one to the receiving portion 4 of the disk 3 by a parts feeder or the like (not shown). In the workpiece W, the head H is hooked on the accommodating portion 4 of the disk 3, and the shaft portion J is suspended from the accommodating portion 4.
When the disk 3 rotates intermittently and the workpiece W reaches the position of the flaw detection section 40, the roller 25 rides on the convex section 5. Since the upper fixing plate 23 and the lower fixing plate 31 of the workpiece height adjusting unit 20 are connected to each other by a screw portion 29 at a constant interval, when the roller 25 rides on the convex portion 5, the upper fixing plate 23 is fixed. The upper slider 22 and the lower slider 30 slide upward along the vertical guide portion 21, and the workpiece push-up portion 33 protruding from the lower fixing plate 31 is pushed up by a certain amount. The pushed-up workpiece push-up portion 33 pushes up the end portion of the shaft portion J of the workpiece W suspended by the housing portion 4 and separates the seating surface of the head H from the upper surface of the housing portion 4.
In the flaw detection unit 40, the rotation drive unit 52 of the flaw detection unit 40 is rotationally driven by an electrical signal from a control device (not shown) that is interlocked with the intermittent drive of the intermittent rotation device 7. When the rotation drive unit 52 is driven to rotate, the connecting pin 60 connected to the crank arm 59 moves back and forth due to the eccentric rotation of the crank pin 58 and moves the slider 61 and the flaw detection support unit 62 back and forth. The flaw detection probe holder 71 moves back and forth. When the slider 61 and the flaw detection support part 62 move forward, the auxiliary roller 64 located on the front side of the flaw detection support part 62 comes into contact with the shaft part J of the workpiece W suspended from the storage part 4, and the shaft part J is brought into contact with the rotating roller 15. Press. The rotating roller driving device 10 starts driving in conjunction with the advancement of the auxiliary roller 64 by an electric signal from a control device (not shown), and the rotating roller 15 starts rotating. The shaft portion J of the workpiece W pressed against the rotating roller 15 by the auxiliary roller 64 is sandwiched between the pair of left and right auxiliary rollers 64 and the rotating roller 15 with the seating surface of the head H separated from the upper surface of the housing portion 4. It rotates in the state where
Further, when the slider 61 and the flaw detection support portion 62 advance, the flaw detection probe holding portion 71 also advances, and the guide portion 73 biased forward by the elastic body 70 contacts the head H of the workpiece W. When the guide portion 73 comes into contact with the head H, the flaw detection probe 72 is disposed at a predetermined position retracted from the guide portion 73 with reference to the surface of the head H as shown in FIG. Since the workpiece W rotates while being sandwiched between the auxiliary roller 64 and the rotating roller 15, the flaw detection probe 72 detects the entire circumference of the surface of the head H.

When the disk 3 is intermittently rotated and the flawed workpiece W is separated from the flaw detection position, the roller 25 is lowered from the convex portion 5 in the workpiece height adjusting unit 20, so that the upper slider on which the upper fixing plate 23 is fixed. 22 and the lower slider 30 slide downward along the vertical guide portion 21, and the position of the workpiece push-up portion 33 projecting from the lower fixing plate 31 is lowered, so that the workpiece W cannot be pushed up, and the workpiece W It fits in a state of being suspended in the housing part 4.
In the flaw detection unit 40, the connecting pin 60 connected to the crank arm 59 is moved to the rear side by the eccentric rotation of the crank pin 58 in accordance with the rotation drive of the rotation driving unit 52, and the slider 61 and the flaw detection support unit 62 are moved to the rear side. The flaw detection probe holding part 71 is moved backward.
Further, when the slider 61 and the flaw detection support portion 62 are retracted, the auxiliary roller 64 positioned on the front side of the flaw detection support portion 62 is separated from the shaft portion J of the work W suspended by the storage portion 4, so that the shaft portion J is a rotating roller. Also away from 15. The rotating roller driving device 10 stops driving in conjunction with the backward movement of the auxiliary roller 64 by an electric signal from a control device (not shown), and the rotating roller 15 stops rotating.

Thus, when the flaw detection unit 40 is moved backward, the disk 3 is intermittently rotated to transport a new workpiece W to the flaw detection position, and then the flaw detection unit 40 is advanced to perform flaw detection on the head H of the workpiece W. Do. Since the disk 3 is rotated and the new workpiece W is conveyed when the flaw detection unit 40 is moved backward, it is possible to prevent the workpiece W from colliding with the guide unit 73 and the flaw detection probe 72.
In the unlikely event that an electrical failure occurs in the rotary drive unit 52 or the like due to an instantaneous power failure, electromagnetic noise, or the like, a problem occurs in the transmission of electrical signals, and the disk 3 rotates when the flaw detection unit 40 is not retracted. Before W collides with the guide part 73 or the flaw detection probe 72, the retreating part 9 that rotates together with the disk 3 collides with the retraction part touching part 74 and blows off, forcing the overhanging part 69 and the flaw detection probe holding part 71 into force. Therefore, the workpiece W is prevented from colliding with the guide portion 73 and the flaw detection probe 72, and the guide portion 73 and the flaw detection probe 72 are prevented from being damaged.

As described above, since the automatic flaw detection apparatus according to Embodiment 1 of the present invention is configured, the following operation can be obtained.
(1) Since the guide portion 73 protrudes from the tip of the flaw detection probe 72, when the guide portion 73 comes into contact with the head H, the flaw detection probe 72 is retracted from the guide portion 73 with reference to the surface of the head H. Since the head H is arranged at a predetermined position, a certain gap amount can be secured between the head H and the flaw detection probe 72 even if the diameter of the head H varies. For this reason, it is possible to satisfy both the prevention of the damage of the flaw detection probe 72 and the head H of the workpiece W and the improvement of the detection accuracy at the same time, and a high detection accuracy can be ensured without reducing the quantity capable of flaw detection per unit time. As a result, an automatic flaw detector having one or more sorting capabilities per second can be manufactured.
(2) Since the guide portion 73 is a roller that can rotate in the horizontal direction, when the workpiece W is rotated in the accommodating portion 4, the roller also rotates as the head H of the workpiece W rotates. Scratches caused by rubbing against the side surface of the head H of the workpiece W are not easily generated, and the high quality can be maintained without impairing the beauty of the workpiece W.
(3) When there is a slit or protrusion on the seating surface of the head H of the workpiece W (for example, for bolt loosening prevention), when the workpiece W is rotated in the housing portion 4, the upper surface and the head of the housing portion 4 Although the workpiece H is rubbed against the seating surface of the part H, the work W cannot be stably rotated, and the upper surface of the housing part 4 may be worn away early due to friction or the seating surface may be damaged. Since the workpiece push-up portion 33 disposed below the disk 3 is provided, the end portion of the shaft portion J of the workpiece W is pushed up when the workpiece W is rotated in the accommodating portion 4, and the seat surface of the head H Can be separated from the upper surface of the housing portion 4, the workpiece W can be stably rotated, wear of the upper surface of the housing portion 4 can be prevented, and the seat surface can be prevented from being damaged.
(4) Since the end of the workpiece W is pushed up by the workpiece push-up portion 33, the workpiece W rotates around the end of the shaft portion J having a small area. It can be rotated and excels in energy saving.
(5) Since the height of the workpiece push-up portion 33 can be adjusted by adjusting the distance between the upper slider 22 and the lower slider 30 that can slide along the vertical guide portion 21, the dimensions of the shaft portion J are different. Even the work W can be flaw-detected by adjusting the push-up height of the work push-up portion 33, and is excellent in versatility.
(6) A convex portion 5 is formed on a straight line connecting the drive shaft 2 on the upper surface of the disk 3 and each accommodating portion 4, and on a straight line connecting the flaw detection position (advance position of the flaw detection probe 72) and the drive shaft 2. Since the roller 25 is positioned and the roller 25 rolls on the upper surface of the disk 3 and the convex portion 5 as the disk 3 rotates, the workpiece push-up portion 33 is fixed at a flaw detection position by the vertical movement caused by the roller 25 rolling. Therefore, the seating surface of the head H can be reliably separated from the upper surface of the housing portion 4 at the flaw detection position.
(7) As the flaw detection probe 72 moves back and forth, the auxiliary roller 64 moves back and forth, the advanced auxiliary roller 64 comes into contact with the shaft portion J of the workpiece W suspended by the housing portion 4, and the shaft portion J is rotated by the rotating roller. 15, the shaft portion J of the workpiece W is rotated while being sandwiched between the auxiliary roller 64 and the rotating roller 15, so that the cycle time can be shortened and high-speed inspection can be performed.
(8) If any abnormality occurs, the flaw detection probe 72 may not be retracted even when the disk 3 starts to rotate, and the workpiece W housed in the housing part 4 of the disk 3 collides with the guide part 73, and the guide part 73 and the flaw detection probe 72 may be damaged, but since the retraction portion 9 that rotates together with the disk 3 is provided, the retraction portion contact disposed in front of the flaw detection probe 72 when the flaw detection probe 72 does not retract. Since the flaw detection probe 72 urged forward by the elastic body 70 can be forcibly retracted against the urging force of the elastic body 70 by causing the retracting portion 9 to touch the portion 74, the disk 3 Even if an abnormality occurs such that the flaw detection probe 72 does not move backward even when rotation is started, the guide portion 73 and the flaw detection probe 72 can be prevented from touching the workpiece W and being damaged.
(9) Since the guide portion 73 is formed of a roller, even if the guide portion 73 (roller) rubs against the head H of the workpiece W during forced retraction, the roller rotates so that the head H is damaged. Since it is difficult and there is little friction with the head H, the guide part 73 and the flaw detection probe 72 can be smoothly retracted.
(10) Since the rotating roller fixing portion 14 for fixing the rotating roller 15 is arranged to be freely rotatable on the drive shaft 2 and the rotation center of the rotating roller 15 is shared with the drive shaft 2 of the disk 3, The rotating device can be made compact, and thus the automatic flaw detector 1 can be miniaturized.
(11) Since the flaw detection probe 72 and the guide part 73 are urged forward by the elastic body 70, the guide part 73 can be reliably brought into contact with the surface of the head H, and the diameter of the head H varies. Even if there is, a certain gap amount can be secured between the head H and the flaw detection probe 72.

In the present embodiment, the case where the end of the workpiece W is pushed up by the workpiece push-up portion 33 has been described. However, no slit or protrusion is formed on the seating surface of the head H of the workpiece W. In the case of flatness, the workpiece push-up portion 33 is not always necessary.
Moreover, although the case where the elastic body 70 is a spring was demonstrated, if it can urge ahead, it will not be limited to this, A gas damper etc. may be used.
Moreover, although the case where the guide part 73 was arrange | positioned in the both sides of the flaw detection probe 72 was demonstrated, it may be arrange | positioned in either one of the side parts. Further, the guide portion 73 may be a member such as a rod or a lump having a rounded tip, even if it is not a roller.

  The present invention relates to an automatic flaw detection apparatus that automatically detects a head of a workpiece having a cylindrical surface such as a bolt, a pin, and a rivet using eddy current, and ensures a certain gap amount between the head and the flaw detection probe. In addition, it is possible to provide an automatic flaw detection apparatus that can simultaneously satisfy the prevention of damage to the flaw detection probe and the workpiece head and the improvement of detection accuracy, and can ensure high detection accuracy without reducing the flaw detection capability per unit time.

Main part plan view of automatic flaw detector in embodiment 1 Front view of workpiece height adjustment part of automatic flaw detector Front view of the flaw detection part of the automatic flaw detector Side view of main part of flaw detector Plan view of the main part of the flaw detector

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Automatic flaw detector 2 Drive shaft 3 Disk 4 Storage part 5 Convex part 6 Base 7 Intermittent rotation apparatus 8 Retraction part fixing plate 9 Retraction part 10 Rotation roller drive device 11,12 Pulley 13 Belt 14 Rotation roller fixation part 15 Rotation roller 20 Work height adjustment part 21 Vertical guide part 22 Upper slider 23 Upper fixing plate 24 Roller fixing part 25 Roller 26 Through hole 27 Adjustment shaft 28 Handle 29 Screw part 30 Lower slider 31 Lower fixing plate 32 Through hole 33 Work lifting part 34 Workpiece holding part 35 Workpiece holding part 40 Flaw detection part 41 Linear motion guide part 42 Slider 43 Front side support part 44 Rear side support part 45 Fixing plate 46 Adjustment shaft 47 Handle 48 Screw part 49 Through hole 50 Flaw detection part support plate 51 Linear motion guide Portion 52 Rotation drive portion 53 Rear shaft portion 54, 55 Pulley 56 Belt 5 Front shaft portion 58 Crank pin 59 Crank arm 60 Connecting pin 61 Slider 62 Flaw detection support portion 63 Arm portion 64 Auxiliary roller 65 Flaw detection probe support portion 66 Shaft holder 67 Shaft 68 Outer cylinder 69 Overhang portion 70 Elastic body 71 Flaw detection probe holding portion 72 Flaw detection probe 73 Guide part 74 Retraction part Touching part W Work H Head J Shaft part

Claims (4)

A horizontal disk having a receiving portion for receiving a workpiece having a cylindrical surface at a constant pitch in the circumferential direction, an intermittent rotation device for intermittently rotating the disc by the pitch, and the workpiece in the receiving portion. An automatic flaw detection apparatus comprising: a work rotation device that rotates; and a flaw detection probe that moves forward and backward in conjunction with rotation of the disk and approaches the head of the work when moving forward,
A guide portion that protrudes forward from the tip of the flaw detection probe to a side portion of the flaw detection probe, and a convex portion that is formed on a straight line connecting the central axis of the upper surface of the disk and each of the accommodating portions. And a roller that rolls on the upper surface of the disk and the convex portion as the disk rotates, and an end of the work is pushed up when the work is rotated in the receiving portion. A workpiece push-up portion that separates the seating surface of the head from the upper surface of the housing portion, and the vertical movement of the roller when rolling on the disk and the upper surface of the convex portion is up and down of the workpiece push-up portion. Automatic flaw detection device characterized by being linked to movement. A retracting portion that is formed at the same pitch on the front side in the rotational direction from directly above or directly below the receiving portion that is formed in a cutout shape around the disc, and that rotates together with the disc, and substantially the same as the retracting portion in front of the flaw detection probe claims and retracting section tactile protrusion is disposed at a height, wherein the by retracting section is Sawa突to the retracting section tactile protrusion and wherein the forcibly retracting the flaw detection probe 1 Automatic flaw detector described in 1 . A drive shaft connected to the intermittent rotation device to rotate the disk, a rotation roller arranged to be free to rotate on the drive shaft and rotating the workpiece from a side surface, and horizontally at substantially the same height as the rotation roller The automatic flaw detection apparatus according to claim 1, further comprising: a pair of left and right auxiliary rollers that are disposed and press the shaft portion of the workpiece against the rotating roller.   The automatic flaw detection apparatus according to claim 1, wherein the guide portion is a roller that is rotatable in a horizontal direction.

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