JP4930948B2 - Shaft body conveying device and outer diameter inspection device for large diameter portion of shaft body using the same - Google Patents

Description

  In the present invention, a shaft body having a large-diameter portion on the outer periphery of the shaft portion, for example, a bolt having a head, a pin with a hook, a hollow shaft with a hook (a sleeve with a hook), etc., is suspended by using a rotary table. The present invention relates to an outer diameter inspection apparatus that inspects the quality of an outer diameter of a large-diameter portion of a shaft body using the shaft body conveyance apparatus that conveys the shaft body.

  An inspection apparatus for a shaft body provided with a shaft body transport device for rotating a rotary table having notches at a constant pitch on the outer periphery around a support shaft as a fulcrum and transporting a shaft body as a transported object by this rotary table. However, for example, it is disclosed in Patent Document 1 below.

  The shaft transport device adopted in the inspection apparatus introduces the shaft portion of the shaft body into the notch groove on the outer periphery of the rotary table in the workpiece supply unit, and supports the large diameter portion of the shaft body from below with the rotary table in this state. Then, the shaft body is conveyed toward the work discharge section by rotating the table.

  A fixed guide is provided on the outer periphery of the rotary table in order to hold the shaft body received in the notch groove on the outer periphery of the rotary table in the workpiece supply unit during the conveyance. The fixed guide is placed close to the rotary table with a gap necessary for rotating the table, and the inlet of the notch groove is closed by the fixed guide at a required position.

  The shaft body inspection device adopting this shaft body conveying device is used for inspection of the shape of the head such as bolts and screws, the state of plating, the diameter and length of the shaft portion, and the processing leakage of the thread. .

JP 2007-55763 A

  In the conventional inspection device described above, the shaft portion of the shaft supported by the rotary table has a portion that hangs down below the rotary table, so it is a problem to check the outer diameter using an optical outer diameter measuring device. Can be done without.

  However, the measurement of the large diameter portion and the pass / fail judgment using the optical outer diameter measuring device for the shaft mounted on the rotary table may not be performed for the following reasons.

  Since there are few restrictions on the installation of the light projecting / receiving unit on the lower side of the rotary table, measuring light can be projected from the side to the shaft hanging from the rotary table by installing the light projecting / receiving unit on the lower side. . On the other hand, in the measurement of the large-diameter portion of the shaft mounted on the rotary table, the light projecting unit and the light receiving unit may be installed above the rotary table when the measurement light is applied from the side to the inspection site. I need it.

However, meeting the requirements while avoiding interference with the rotary table and the fixed guide is not easy due to space limitations. In particular, when the thickness of the large-diameter part of the shaft, which is the inspection site, is thin, the light projecting part and light receiving part must be placed near the upper surface of the rotary table or fixed guide, so installation is performed while avoiding interference with these parts. Becomes difficult.
Even if it can be installed, if the thickness of the large-diameter portion is small, the measurement light projected from the side to the large-diameter portion must be made into a very thin slit light. As a result, the absolute value of the amount of change in the amount of received light decreases, making it difficult to obtain satisfactory measurement accuracy.

  A method of measuring the outer diameter of the large-diameter portion by directly viewing the large-diameter portion of the shaft mounted on the rotary table from above with an image sensor is also conceivable. As the distance to the large-diameter portion increases, the upper side of the large-diameter portion appears to expand widely, so accurate outer diameter measurement cannot be performed.

  This invention eliminates the installation restriction on the space surface of the light projecting / receiving section, which has been a problem in the transport device that transports the shaft body using the rotary table having a notch groove on the outer periphery, and measures the optical outer diameter. It is an object of the present invention to make it possible to measure the size of the large-diameter portion of the shaft body and determine the quality of the outer diameter using an apparatus.

In order to solve the above-described problems, in the present invention, a rotary table that rotates around a central support shaft and has a notch groove at a constant pitch on the outer periphery, and a gap for rotating the table on the outer periphery of the rotary table. Have a fixed guide
A workpiece supply unit is installed on the outer periphery of the rotary table, and in the workpiece supply unit, the shaft portion of the shaft body to be conveyed is received in conformity with the notch groove, and in this state the large diameter portion is received by the rotary table. The following elements were added to the shaft body transport device that supports the shaft body from below and transports the shaft body toward the workpiece discharge section by rotating the table.
That is, a pair of slits is provided in each of the rotary table and the fixed guide, and the slits are notched in a plan view when the notch groove reaches the outer diameter measuring unit installed in the middle of the conveyance path. Opposing on the straight line passing through the center of the notch with the large diameter part of the shaft introduced into the groove in between, the measuring light or illumination light of the optical outer diameter measuring device is applied to this slit in the outer diameter measuring part I was able to pass it vertically.

  In this case, “accepting the shaft portion of the shaft body in conformity with the notch groove” means that the shaft portion is introduced into the notch groove with little radial play and positioned at the center of the notch groove. Means that.

  It is preferable that a plurality of pairs of slits on the rotating table side and slits on the fixed guide side facing each other in the outer diameter measuring unit are provided with different installation directions.

  The light projecting unit is preferably a laser diode that can project parallel measurement light or illumination light.

According to the present invention, the outer diameter of the shaft body transporting device, the light projecting unit and the light receiving unit that are arranged to face each other with the rotary table and the fixed guide of the shaft body transporting device interposed therebetween, and the light receiving signal of the light receiving unit. An outer diameter measuring device having an operation / determination unit for performing operation / determination is provided, and the light projecting unit and the light receiving unit are installed in the outer diameter measuring unit, and the measurement light projected from the light projecting unit is a rotary table. And the light receiving part through the slits provided in the fixed guides,
The amount of light received by the light receiving portion varies according to a change in the diameter of the large diameter portion of the shaft conveyed to the outer diameter measuring portion,
In addition, an outer diameter inspection device in which the calculation / determination unit determines whether the outer diameter of the large-diameter portion is good or bad by comparing the calculation of the outer diameter of the large-diameter portion based on the amount of received light and a reference value. provide.
The light projecting unit and the light receiving unit of the inspection apparatus may be replaced with a light projecting unit that irradiates illumination light and a camera that images the large-diameter portion of the shaft body facing the light projecting unit. The large-diameter portion of the shaft that blocks the illumination light is reflected on the camera as a dark image similar to a shadow. And the size of the image at that time fluctuates according to the change in the diameter of the large-diameter portion of the shaft conveyed to the outer-diameter measuring unit, and therefore, the outer diameter of the large-diameter portion based on the size variation of the captured image. In the same way as the device that measures the outer diameter based on the amount of light received by the light receiving unit by performing the pass / fail determination of the outer diameter of the large diameter portion in the calculation / determination unit by comparing the calculation of and the reference value The outer diameter of the large diameter part can be inspected.

  The light projecting portion of this inspection apparatus is preferably configured with a laser diode so that it can project parallel measurement light and illumination light.

  In the shaft transport device of the present invention, the rotary table and the fixed guide are provided with slits facing each other on a straight line passing through the center of the notch groove when the notch groove on the outer periphery of the rotary table reaches the outer diameter measuring unit. In the outer diameter measuring section, the measuring light of the optical outer diameter measuring device can be passed vertically through the slit.

  As described above, when the measurement light is vertically passed through the slit, the light projecting portion and the light receiving portion of the outer diameter measuring device using this transport device are fixed to the rotary table while avoiding interference with the rotary table and the fixed guide. It can be installed above or below the boundary of the guide, and the optical diameter measurement device is used to measure the outer diameter of the large diameter part of the shaft mounted on the rotary table after the installation restrictions on the light emitting and receiving parts are removed. Can be performed. The optical outer diameter measuring device mentioned here includes a light projecting unit, a light receiving unit, and a calculation / determination unit arranged opposite to each other, and calculates and determines the outer diameter based on the amount of light received by the light receiving unit. By irradiating illumination light from the light projecting part, projecting a shadow image of the part that blocked the illumination light with a camera, and by calculating the outer diameter of the large diameter part and comparing it with a reference value based on the size variation of the captured image Also included is a device that performs a pass / fail judgment on the outer diameter of the large-diameter portion in the calculation / determination unit.

  Also, by passing the measurement light vertically through the slit, the light projection area of the measurement light can be expanded regardless of the thickness of the large diameter part, and by expanding the light projection area, the diameter of the large diameter part can be increased. It is also possible to increase the measurement accuracy by increasing the amount of received light and the change in image size due to the change.

  In addition, if a plurality of pairs of slits on the rotary table and fixed guide side facing each other in the outer diameter measuring section are provided with different installation directions, the outer diameter measurement of the large diameter portion of the shaft body is performed at a plurality of locations. To improve the measurement accuracy. In addition, by comparing the measured values at a plurality of locations, it is possible to inspect for the presence or absence of distortion of the outer diameter.

  In addition, since the outer diameter inspection apparatus of the present invention is measured by a method of projecting a part of the large diameter portion, the measurement light is preferably parallel light onto which the actual size of the outer diameter is projected, and the light projecting portion is a laser diode It is possible to meet the demand by configuring with. However, even if the measurement light or illumination light is non-parallel light, the outer diameter can be measured by examining the relationship between the amount of received light and the area of the image captured by the camera and the outer diameter in advance.

  Embodiments of the present invention will be described below with reference to FIGS. 1 to 4 show an example of a shaft conveying device of the present invention. This shaft transport device 1 is configured by combining a rotary table 2 and a fixed guide 3.

  A workpiece supply unit 5 is installed at the start end of the fixed guide 3, and an outer diameter measuring unit 7 of the shaft body is installed in the middle of the conveyance path. In addition, a workpiece discharge unit 8 is installed near the end of the fixed guide 3. The work discharge unit 8 is divided into a defective product discharge unit 8a and a non-defective product discharge unit 8b, and the shape of the shaft and the large diameter part in which the outer diameter error of the large diameter part is out of the allowable range is distorted. The shaft body is taken out to the defective product discharge section 8a.

  The rotary table 2 has a support shaft 2a at the center, and rotates the table about the support shaft 2a. The rotation is performed continuously or intermittently using a motor (not shown) as a drive source. The rotary table 2 is provided with notched grooves 4 at a constant pitch on the outer periphery. The rotary table 2 may be arranged horizontally or may be intentionally inclined slightly.

  The fixed guide 3 is placed along the outer periphery of the rotary table 2 with a gap for rotating the table, and the entrance of the notch groove 4 is closed by the fixed guide 3 at a place where the fixed guide 3 is installed. It is done.

  The workpiece supply unit 5 is installed on the outer periphery of the rotary table 2 on the start end side of the fixed guide 3. The workpiece supply unit 5 is exemplified as having a linear feeder 6. In the workpiece supply unit 5, the shaft body A to be transported is supplied from the linear feeder 6 to the cutout groove 4 on the outer periphery of the rotary table.

Shaft A has been exemplified those having a large diameter portion a ₂ projecting in the longitudinal middle of the outer periphery of the shaft portion a ₁ in the radial direction, the large, such as the head or flange on the upper end of the shaft portion a ₁ What provided the diameter part also becomes a target of conveyance.

1 has two rails 6a and 6a arranged in parallel, and the shaft body A is supported and supplied by the rails 6a and 6a. Supply of the shaft A by the linear feeder 6, the rails 6a, allowed to enter the shaft portion a ₁ of the shaft A between 6a, shaft A supports the large diameter portion a ₂ of the shaft periphery rails 6a, 6a In In this state, the shaft body A is moved from the rail tip to the notch groove 4 on the outer periphery of the rotary table.

As shown in FIG. 4, the notch groove 4 on the outer periphery of the rotary table is sized to fit the shaft portion a ₁ of the shaft body A, and the shaft portion a ₁ has almost no radial play. It is introduced into the notch groove 4 and positioned at the center C (see FIGS. 2 to 4) of the notch groove.

The entrance of the notch groove 4 is blocked by the fixed guide 3 at the place where the fixed guide 3 is installed. The distance from the center of the notch groove 4 to the fixed guide 3 is substantially equal to the radius of the shaft portion a ₁ of the shaft body A (strictly, it is slightly larger than the sliding portion between the shaft portion a ₁ and the fixed guide 3. Therefore, the shaft body A introduced into the notch groove 4 is positioned at the center of the notch groove 4 and is prevented from being displaced toward the fixed guide 3 side.

  The configuration described above is not much different from that of a conventional shaft transport device. That is, this invention is characterized by the following elements.

  The rotary table 2 and the fixed guide 3 are provided with slits 9 and 10 shown in FIGS. One slit 9 is provided in each notch groove 4, and only one slit 10 is provided in the fixed guide 3 at a place where the outer diameter measuring unit 7 is installed.

The slit 9 on the rotary table 2 side and the slit 10 on the fixed guide 3 side are provided when the notch groove 4 on the outer periphery of the rotary table reaches the outer diameter measuring unit 7 in the middle of the conveyance path as the rotary table 2 rotates. plane straight reference line passing through the cutout groove center C sandwiched between the large diameter portion a ₂ of the shaft a, which is introduced into the notched groove 4 of an outer diameter measuring unit in view S (see FIGS. 3 and 4) It arrange | positions so that it may oppose on.

The lengths L and widths W of the slits 9 and 10 are equal to each other in the case of the illustrated apparatus. When the center C of the notch groove 4 is at the center of the outer diameter measuring unit 7, the slits 9 and 10 are outside. symmetrical shape at the center C criteria diameter measuring section 7 notched groove 4 groove notches extending out to the outside of the large diameter portion a ₂ of the shaft a, which is introduced into the 4 (see FIG. 2).

Due to the installation of the slits 9 and 10, the shaft A is introduced into the notch groove 4 of the outer diameter measuring unit 7 through the measuring light of the optical outer diameter measuring device in the vertical direction in the outer diameter measuring unit 7. it is possible to measure the outer diameter of the diameter a _2. Note that the length L and the width W of the slits 9 and 10 may be different. The length L and width W of the slit 9 and 10 are the same, regardless of whether different, the amount of light received by the changes associated with the diameter change of the large-diameter portion a ₂ of the shaft A occurs.

  FIG. 5 shows an outline of an example of the outer diameter measuring device 11. The outer diameter measuring device 11 performs calculation / determination of the outer diameter based on the light projecting unit 12, the light receiving unit 13, and the light receiving signal of the light receiving unit 13 that are arranged to face each other with the rotary table 2 and the fixed guide 3 interposed therebetween. -The determination part 14 and the display part 15 which displays the calculated outer diameter and determination result are provided, and the light projection part 12 and the light-receiving part 13 are installed in the outer diameter measurement part 7.

The light projecting unit 12 of the illustrated outer diameter measuring device 11 uses a laser diode and outputs parallel measuring light 16. The measurement light 16 projected from the light projecting unit 12 reaches the light receiving unit 13 through slits 9 and 10 provided in the rotary table 2 and the fixed guide 3 respectively. Received light amount by the light receiving unit 13 at this time will vary with the diameter change of the large-diameter portion a ₂ of the shaft A that closes a part of the slit 9 and 10, therefore, based on the amount of light received by the light receiving portion 13 large The outer diameter of the diameter part a ₂ can be measured, and the quality of the outer diameter of the large diameter part a ₂ can be determined by comparing the measurement result with a preset reference value.

In the quality inspection of the outer diameter of the large diameter portion a _2, since bad been judged shaft body is taken to defective discharging portion 8a in the work discharge section 8, displays the determination result and the calculated outside diameter displayed The part 15 is not necessarily required.

  In this way, by providing the structure in which the measurement light is passed vertically through the slit, it is possible to eliminate the installation restriction of the light projecting / receiving part of the outer diameter measuring device 11, and the light projecting area of the measuring light is made to have a thickness of the large diameter part. It is also possible to spread without being influenced by.

  FIG. 6 shows an example in which a plurality of pairs of slits 9 on the rotating table side and slits 10 on the fixed guide side that face each other in the outer diameter measuring unit 7 are provided with different installation directions. Measurement of the outer diameter of the large-diameter portion of the shaft body is possible with a pair of slits 9 and 10 as shown in FIG. 2, but when a plurality of slits 9 and 10 are provided as shown in FIG. The measurement accuracy can be increased by measuring the outer diameter of the large diameter portion of the shaft body A at a plurality of locations. In addition, by comparing the measured values at a plurality of locations, it is possible to inspect for the presence or absence of distortion of the outer diameter.

  In FIG. 6, two pairs of slits 9 and 10 are provided with their installation directions different by 90 °, but two or more pairs of slits 9 and 10 may be provided.

  The light receiving unit 13 may be replaced with a camera (not shown). The illumination light is irradiated from the light projecting unit 12, and the large-diameter portion of the shaft body A that blocks the illumination light is imaged by the camera, and the change in the area of the image at that time is changed to the diameter change of the large-diameter portion of the shaft body A. Even in the conversion method, the outer diameter inspection of the large-diameter portion of the shaft body can be performed in the same manner as the apparatus that measures the outer diameter based on the amount of light received by the light-receiving portion.

The top view which shows the outline | summary of an example of the shaft conveying apparatus of this invention Enlarged plan view of the notch groove on the outer periphery of the rotary table moved to the outer diameter measuring unit and the shaft body introduced into the groove Sectional view along line III-III in FIG. Partially broken plan view showing a state in which the shaft portion of the shaft body is received in the notch groove on the outer periphery of the rotary table Diagram showing an example of an outer diameter measuring device Enlarged plan view of the main part of the shaft transport device with multiple pairs of slits on the rotary table side and slits on the fixed guide side

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft conveying apparatus 2 Rotary table 2a Support shaft 3 Fixed guide 4 Notch groove 5 Work supply part 6 Straight feeder 6a Rail 7 Outer diameter measurement part 8 Work discharge part 8a Defective product discharge part 8b Non-defective product discharge part 9, 10 Slit 11 Outer diameter measuring device 12 Light projecting unit 13 Light receiving unit 14 Calculation / determination unit 15 Display unit 16 Measuring light A Shaft body a ₁ Shaft portion a ₂ Large diameter portion S Reference line C Notch groove center L Slit length W Slit length width

Claims (5)

The rotary table (2), which has a central support shaft to be rotated around a fulcrum and provided with notched grooves (4) at a constant pitch on the outer circumference, and a gap for rotating the table on the outer circumference of the rotary table (2). Have a fixed guide (3)
A workpiece supply unit (5) is installed on the outer periphery of the rotary table (2), and in the workpiece supply unit (5), a large-diameter portion projecting radially on the upper end of the shaft portion (a ₁ ) or on the outer periphery in the middle of the length. The shaft portion (a ₁ ) of the shaft body (A) provided with (a ₂ ) is received in conformity with the notch groove (4), and in this state, the large diameter portion (a ₂ ) is received by the rotary table. A shaft body transport device that supports from below in (2) and transports the shaft body (A) toward the work discharge unit (8) by rotating the table,
The rotary table (2) and the fixed guide (3) are provided with a pair of slits (9, 10), and the slits (9, 10) are provided in the outer diameter measuring section (7 ) With the large-diameter portion (a ₂ ) of the shaft body introduced into the cut-out groove (4) of the outer diameter measuring portion in plan view when the cut-out groove (4) arrives. Opposing on the straight reference line (S) passing through the groove center (C), the measurement light or illumination light of the optical outer diameter measuring device is vertically applied to the slits (9, 10) in the outer diameter measuring section (7). A shaft transport device that can be passed in the direction.   The shaft body conveying device according to claim 1, wherein a plurality of pairs of slits (9) on the rotary table and slits (10) on the fixed guide side facing each other in the outer diameter measuring unit are provided with different installation directions. A light projecting unit (12) and a light receiving unit arranged opposite to each other with the shaft transport device (1) according to claim 1 or 2 and the rotary table (2) and fixed guide (3) of the shaft transport device interposed therebetween. (13), and an outer diameter measuring device (11) comprising an outer diameter calculating / determining section (14) based on the received light signal of the light receiving section (13). The measurement light projected from the light projecting unit (12) is installed on the outer diameter measuring unit (7) by the unit (12) and the light receiving unit (13), respectively, on the rotary table (2) and the fixed guide (3). Through the slits (9, 10) provided to the light receiving part (13),
The amount of light received by the light receiving portion (13) varies according to the diameter change of the large diameter portion (a ₂ ) of the shaft body (A) conveyed to the outer diameter measuring portion (7),
The calculation / determination unit (14) determines whether the outer diameter of the large-diameter portion (a ₂ ) is good or bad by comparing the calculation of the outer diameter of the large-diameter portion (a ₂ ) based on the amount of received light and a reference value. The outer diameter inspection device for the large diameter part of the shaft body. In place of the light projecting unit (12) and the light receiving unit (13) of the outer diameter inspection apparatus according to claim 3, a light projecting unit for irradiating illumination light and a camera facing the light projecting unit are provided, and an image captured by the camera Of the large diameter portion (a ₂ ) of the shaft body (A) conveyed to the outer diameter measuring portion (7) varies according to the diameter change, and the large diameter is based on the size variation of the captured image. part the shaft body large diameter quality determination of the perimeter is to be performed in the calculation and determination portion (14) of the large-diameter portion (a ₂₎ by comparison with the arithmetic and the reference value of the outer diameter of the (a ₂₎ External diameter inspection device for parts.   The outer diameter inspection device for a shaft body large-diameter portion according to claim 3 or 4, wherein the light projecting portion (12) is constituted by a laser diode, and parallel light is projected as the measurement light or illumination light.

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