JP2005331490A - Examination system for axial tension guaranteed bolt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To continuously, easily, and quickly perform an axial tension guaranteed load test on a headed bolt, thus allowing a guaranteed load test to be carried out on all the headed bolts. <P>SOLUTION: This system is provided with an L-shaped button clamp lifting lever 4 having a support groove 4a supporting a neck part B3 of the headed bolt B, a supply means intermittently supplying the headed bolts B one by one to the support groove 4a in the button clamp lifting lever 4, an engagement means 5 engaging removably in the tip part of the headed bolt B supported by the support groove 4a of the button clamp lifting lever 4, and a guaranteed load applying mechanism rocking the button clamp lifting lever 4 in the head part lifting direction of the headed bolt B while engaging and holding the tip part of the headed bolt B by the engaging means 5 to applying a fixed guaranteed load between the head part B2 and the tip thread part B1 of the headed bolt B for measuring and determining whether the headed bolt B passes a guaranteed load test or not. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an axial force ensuring bolt inspection system that ensures the mechanical properties of precision bolts.

  Conventionally, as an inspection method to ensure the mechanical properties of precision bolts, out of a number of head bolts manufactured and accommodated in the case, several head bolts are taken out from the case, and the head that has been taken out is removed. The number of head bolts out of the attached bolts was inspected to pass the guaranteed load test. For example, out of 10 head bolts that were rejected were accommodated in the case. The remaining head bolts are also considered to pass this test, and if there are 3 or more head bolts that fail, the remaining head bolts housed in the case will also be rejected. It is considered to be discarded. In that case, as a secure load test of the axial force securing bolt, for example, as shown in FIG. 4, two headed bolts B are inserted into the through holes 31a, 32a of the support members 31, 32, and then the tip of the headed bolt B is inserted. A nut N is screwed onto the screw part B1 to fix the head bolts B to the two support members 31 and 32, and then a head load B2 and a cylindrical part B3 are loaded by applying a security load to the head bolts B in the axial direction. And whether or not a break occurs at the base portion between the head B2 and the screw portion B1, and if the break occurs, it is regarded as a rejected product.

Problems to be solved by the invention

  However, in the inspection system for the axial force guarantee bolt described above, only a small number of head bolts out of the head bolts housed in the case have been subjected to a guaranteed load test. The remaining head bolts were not actually subjected to a safe load test, and there was a problem that a complete safe load test was not performed. Further, the head bolts B are inserted into the through holes 31a and 32a of the two support members 31 and 32 one by one, and the head bolts B are manually fixed to the two support members 31 and 32 through the nuts N. In addition, since the security load test is performed by applying a security load to the headed bolt B in the axial direction, the test operation is very complicated and time-consuming. Therefore, although it can be adopted as a single inspection means for the head bolts B, it has a problem that it is difficult to adopt as a means for inspecting all the head bolts B.

  Accordingly, an object of the present invention is to provide an inspection system for axial force guarantee bolts that can perform a guarantee load test continuously on all headed bolts so that a guarantee load test can be performed easily and quickly.

Means for solving the problem

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present application includes an L-shaped lifting lever having a support groove for supporting the neck of the headed bolt, and a headed bolt in the supporting groove of the lifting lever. Supply means for intermittent supply, engagement means for releasably engaging the tip of the head bolt supported by the support groove of the pull-up lever, and the tip of the head bolt by the engagement means With the part held engaged, the lifting lever is swung in the head bolt's head pulling direction to apply a certain guaranteed load between the head and the tip of the headed bolt. It is provided with the safe load loading mechanism which measures whether it passes or not.

  Further, the invention described in claim 2 of the present application is a plurality of rotating plates that are intermittently rotated at a constant angle, a plurality of supporting grooves that are swingably supported by the rotating plates and that support the neck of the headed bolt. When the rotary plate is stopped, the L-shaped lifting lever is placed at a position corresponding to the supporting groove of the lifting lever, and the supporting groove of the lifting lever is heat treated and plated, and the nut is fastened to the tip screw part. Supply means for intermittently supplying the headed bolts one by one, and the head bolts arranged at a stop position on the front side in the rotation direction of the pull-up lever with respect to the supply means and moving forward and backward to the pull-up lever side And an engaging means having an engaging groove for engaging the nut, and the pulling lever is disposed in a state of being opposed to the engaging means and engaging the nut with the head bolt. Swing in the direction of lifting the head of the bolt with the head bolt between the head and tip Loaded with certain security load, characterized in that it includes a security load bearing mechanism with axial force tester rod determining whether to pass the security load test.

The invention's effect

  According to the present invention described above, the head bolts are intermittently supplied to the L-shaped lifting lever one by one by the supply means, and the neck of the head bolt is supported and supported by the supporting groove of the lifting lever. The engaging portion of the engaging means is engaged with the tip of the headed bolt, and the pulling lever is swung in the head lifting direction of the headed bolt by the guaranteed load loading mechanism under the engaged state. Since a certain guaranteed load is applied between the head and the tip of the head bolt and whether or not it passes the guaranteed load test, the guaranteed load test is easily and easily performed continuously. This makes it possible to quickly carry out a guaranteed load test on all the head bolts and provide a highly reliable bolt.

  In addition, a plurality of L-shaped lifting levers having support grooves are provided on a rotating plate that is intermittently rotated at a constant angle so as to be swingable. A supply means is provided for intermittently supplying the head bolts, which are heat-treated and plated and the nuts are fastened to the tip screw portions, one at a time. An engaging means having an engaging groove that can be moved forward and backward to engage with a nut of the head bolt, and disposed above the engaging means so as to swing the pull-up lever in the head pulling direction of the head bolt. A secure load-loading mechanism with an axial force tester rod that measures whether or not it passes a secure load test by applying a certain secure load between the head and the tip of the headed bolt is provided. For example, by using a rotating plate that rotates intermittently, Can be performed guarantee load test faster and smoother, thereby all bolts easily quickly be able to perform security load test against Headed high reliability can be provided volts.

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an inspection system for an axial force guarantee bolt according to the present invention. Reference numeral 1 denotes a chute for sequentially transferring a headed bolt B in which a heat treatment and a plating process are performed and a nut N is fastened to a tip screw part B1. An opening / closing supply mechanism 3 for opening and closing the tip opening 1a of the chute 1 and supplying headed bolts B one by one downwardly, 3 is arranged in front of the tip opening 1a of the chute, and driving means (not shown) such as a motor , A rotating plate that is intermittently rotated by a certain angle (90 ° in the drawing), 4 is a plurality of L-shaped lifting levers supported by the rotating plate 3 so as to be swingable, and 5 is 90 more than the chute 1. An engaging means having an engaging groove 5a disposed forward of the rotating plate 3 in the rotational direction and moving forward and backward toward the pulling lever 4 to engage the nut N of the headed bolt B; And the lifting lever 4 is attached to the head bolt. A shaft that swings in the direction of pulling up the head of the head B, applies a certain security load between the head B2 of the headed bolt B and the tip screw B1, and measures whether or not it passes the security load test. This is a security load loading mechanism having a force tester rod 61.

  The rotating plate 3 is rotatably supported on a machine base (not shown) via a rotating shaft 7 and is rotated intermittently by a fixed angle (90 ° in the figure) by a driving means. The pull-up lever 4 is supported by the rotary plate 3 so as to be swingable in the vertical direction via a swing shaft 41 provided in the bent portion in an L shape, and is also supported by a biasing means 10 by a ball 8 and a spring 9. It is normally urged toward the engaging means 5 side. A support groove 4a for supporting the neck B3 of the head bolt B is formed at one end of the lifting lever 4, and a certain security load is applied to the head bolt B at the other intermediate portion. In some cases, an axial force measuring sensor 11 such as a piezo is provided for measuring the axial force of the headed bolt B from the deflection acting on the lever 4.

  Further, the engaging means 5 includes an engaging moving body 51 having an engaging groove 51a that engages with a nut N screwed to the tip screw portion B1 of the headed bolt B, and the engaging moving body 51 is connected to the rotary plate 3. A support member 52 that is supported so as to be movable back and forth is provided, and a moving means (not shown) such as a cylinder that moves the engagement moving body 51 forward and backward.

  In the embodiment shown in the figure, a pivot bolt in which a head B2 is spherical as shown in FIG. 2 as a headed bolt B and a tapered body B4 and a tip screw part B1 are formed through a neck B3. Used. It should be noted that any bolt with a head may be used, and the present invention is not limited to such a pivot bolt. Of course, a general hexagon head bolt may be used.

  The operation of the axial force ensuring bolt detection system configured as described above will be described below.

  First, a headed bolt B, which has been preliminarily manufactured with high precision by a forging machine or the like, heat-treated and plated, and has a nut N fastened to a tip screw portion B1, is attached to the tip opening 1a by a chute 1. Transport continuously. Then, with the rotating plate 3 stopped, the opening / closing body 21 of the opening / closing supply mechanism 2 is retracted to open the tip opening 1a, and the head head bolt B is supplied and supported in the support groove 4a of the pull-up lever 4 Let Further, at the timing when the support is completed, the opening / closing body 21 of the opening / closing supply mechanism 2 is advanced to close the tip opening 1a. Thereafter, the rotating plate 3 is rotated by 90 °, and the lifting lever 4 supporting the headed bolt B is moved to a position facing the engaging means 5 positioned forward in the rotational direction of the rotating plate 3.

  Next, after the rotating plate 3 is rotated by 90 ° and stopped, the locking moving body 51 of the engaging means 5 is advanced inwardly on the lower surface of the rotating plate 3, and the head moves into the locking groove 51 a of the engaging moving body 51. The tip screw portion B1 of the attached bolt B is inserted, and the engagement moving body 51 is engaged with the upper surface of the nut N fastened to the screw portion B1. Thereafter, the axial force tester lot 61 of the guaranteed load loading mechanism 6 is advanced by the hydraulic mechanism to raise the pull-up lever 4, and a certain guarantee is provided between the head B 2 and the nut N in the headed bolt B via the pull-up lever 4. Perform a guaranteed load test with a load applied. When a certain guaranteed load is applied to the head bolt B, there is no break between the head B2 of the head bolt B and the nut N, and the axial force measuring sensor 11 measures a certain axial force. Only when it is judged that the guaranteed load test has been passed. In addition, when a certain guaranteed load is applied to the head bolt B, if a break occurs between the head B2 of the head bolt B and the nut N, the axial force measuring sensor 11 generates a certain axial force. In this case, it is determined that the product is defective. Here, the headed bolt B that has been broken and failed in the guaranteed load test is dropped by a discharge means (not shown) such as a reaction at the time of breakage or proper extrusion at this guaranteed load test position. Yes. Thereafter, the axial force tester lot 61 is moved backward by a hydraulic mechanism to release the lifting lever 4 and the engaging moving body 51 of the engaging means 5 is moved backward to engage the nut N by the locking moving body 51. That is, the engagement with the headed bolt B is released. Further, while performing such a security load test, at the bolt supply position described above, the next headed bolt B is supplied and supported by the opening / closing supply mechanism 2 to the support groove 4 a of the pull-up lever 4. become.

  Thereafter, the rotary plate 3 is rotated 90 ° forward in the rotational direction, and the lifting lever 4 supporting the headed bolt B after the security load test is moved to the discharge position. After the rotary plate 3 stops at the discharging position, the headed bolt B that has passed the guaranteed load test is taken out from the pull-up lever 4 by an appropriate take-out means (not shown) such as a robot, and is used as an axial force guarantee bolt. Will be housed.

  The security load test operation described above is continuously repeated. This makes it possible to easily and quickly perform a security load test for all the head bolts B that require high accuracy. The reliability can be remarkably increased as compared with the conventional axial force guarantee bolt inspection system. Further, by using the rotating plate 3 that is intermittently rotated, it is possible to perform a continuous safe load test more quickly and smoothly. Can provide a reliable bolt.

  In addition, when a paint spraying device (not shown) is disposed at the guaranteed load test position and passes the guaranteed load test, a spray signal is sent from the axial force measuring sensor 11 to the paint spraying device, and the paint spraying device is operated. The upper surface of the head B2 of the headed bolt B or the lower end surface of the tip screw portion B1 may be colored by spraying a paint that is a criterion for passing. If comprised in this way, the user can use the headed bolt B which passed the security load test actually and was guaranteed axial force visually, and can use it without error.

1 is a schematic plan view of an inspection system showing an embodiment of the present invention. It is an AA arrow line view of FIG. It is explanatory drawing which shows the detection state of inferior goods. It is conventional explanatory drawing.

Explanation of symbols

1 Chute 2 Opening / Closing Supply Mechanism 3 Rotating Body 4 L-shaped Lifting Lever 4a Support Groove 5 Engaging Means 51 Engagement Moving Body 51a Engaging Groove 6 Security Load Loading Mechanism 61 Axial Force Tester Lot B Head Bolt B1 Tip Screw B3 Neck Nut

Claims (2)

  L-shaped lifting lever with a support groove to support the neck of the head bolt, supply means for intermittently supplying one head bolt to the support groove of the lifting lever, and support to the support groove of the lifting lever Engaging means for releasably engaging the tip of the headed bolt, and lifting the lever with the head lifted while the tip of the headed bolt is engaged and held by the engaging means. It is equipped with a security load loading mechanism that swings in the direction and applies a certain security load between the head and the tip of the head bolt and measures whether or not it passes the security load test. A featured axial force security bolt inspection system.   A rotating plate that is intermittently rotated at a constant angle, a plurality of L-shaped lifting levers that are supported by the rotating plate so as to be swingable and that support the neck of the headed bolt, and when the rotating plate is stopped Supplied intermittently one head bolt at a position corresponding to the support groove of the pull-up lever, heat-treated and plated on the support groove of the pull-up lever, and tightened with a nut on the tip screw And an engaging groove that is disposed at a stop position on the front side in the rotational direction of the pull-up lever with respect to the supply means and that has an engaging groove that moves forward and backward to the pull-up lever side and engages the nut of the head bolt. And the upper lever is swung in the direction of lifting the head bolt with the engaging means engaged with the nut of the head bolt. Apply a certain guaranteed load between the head and tip of the attached bolt, The test system of axial force security bolt, characterized in that it comprises a protection load bearing mechanism with axial force tester rod determining whether to pass.

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