JP4296418B2 - Axial force securing bolt inspection system - Google Patents

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 for ensuring the mechanical properties of precision bolts, several bolts out of a large number of bolts manufactured and accommodated in the case are taken out of the case, and what is out of the removed bolts? Inspect whether the bolts pass the guaranteed load test. For example, if the number of rejected bolts is within 2, the remaining bolts housed in the case also pass this test. It is considered that if there are 3 or more bolts that are rejected among the 10 bolts, the remaining bolts accommodated in the case are also regarded as rejected products and are discarded. In that case, as a secure load test of the axial force ensuring bolt, for example, as shown in FIG. 13, two headed bolts B are attached to the support members 31 and 32 via nuts N, and then the headed bolt B is A load is applied in the direction to inspect the head B2 and the cylindrical part B3 or whether the root part of the head part B2 and the screw part B1 breaks. It is said.

Problems to be solved by the invention

  However, in the above-described inspection system for the axial force guarantee bolts, only a small number of bolts out of the bolts accommodated in the case have been subjected to a guaranteed load test, and they were left in the case. Regarding bolts, there was a problem that a safe load test was not actually performed and a complete safe load test was not performed. In addition, since a head load bolt B is attached to the two support members 31 and 32 via nuts N and a head load bolt B is loaded with a security load in the axial direction, a security load test is performed. The problem was complicated and time-consuming. In addition, there is a problem that it is not possible to judge whether the bolt to be used has actually passed the guaranteed load test or passed the guaranteed load test.

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

  A shaft that can be confirmed visually to pass the guaranteed load test by performing a guaranteed load test on all bolts and giving a mark for guaranteeing the axial force of those that passed the guaranteed load test. The issue is to provide an inspection system for power security bolts.

Means for solving the problem

[0006]
[Means for Solving the Problems]
In order to solve the above-described problem, the invention according to claim 1 of the present application includes a support member having a through hole allowing insertion of a screw portion of a headed bolt, and a screw portion inserted through the through hole of the support member. The holding member has a holding part for gripping, and includes a guarantee load-loading mechanism that applies a certain guarantee load between the head and the screw part by pulling the screw part grasped by the clamping part in the axial direction. A head that has a round wedge shape, with a constant load applied by the secure load load mechanism with the lower surface of the bolt head in contact with the inclined surface of the bolt, and has passed the secure load test without causing head warpage. It is characterized in that a mark or a paint as a standard for passing is given to the head of the attached bolt.

In the invention according to claim 2 of the present application, the notch portion is continuously provided at the tip of the screw portion of the headed bolt through a breaking groove that is broken by a certain guaranteed load, while the screw portion side of the headed bolt is provided. A support member having a through hole that allows the insertion of the support member, and a clamping part that grips the notch part that penetrates the through hole of the support member, and pulling the notch part gripped by the clamping part in the axial direction between the head part and the notch part And a secure load mechanism that applies a certain secure load to the shaft end of the head bolt that passed the secure load test using the secure load load mechanism. Features.

Further, in the invention according to claim 3 of the present application, the notch portion is provided at the tip of the other end screw portion of the stud bolt, in which the nut is screwed to the one end screw portion, via the breaking groove that is broken by the load of a certain security load. A support member having a through hole that allows a screw to be inserted on one screw part side after a nut is screwed onto the other screw part of the bolt, and a clamping part that grips a notch part that passes through the through hole of the support member It has a secure load load mechanism that applies a certain secure load between the nut and the notch by pulling the notch gripped by the clamping part in the axial direction, and passed the secure load test by the secure load load mechanism. It is characterized in that a fracture mark which becomes a standard of acceptance remains on the shaft end portion of the stud.

The invention's effect

According to the present invention described above, the screw portion of the headed bolt inserted into the through hole of the support member having a tapered wedge shape is gripped by the secure load loading mechanism and pulled in the axial direction, and is brought into contact with the wedge inclined surface. A fixed load is applied between the head and the threaded part to perform a security load test. Or, by applying paint, the safe load test can be carried out easily and quickly and continuously. In addition, the head load does not occur and it is passed the safe load test. Therefore, only bolts with guaranteed axial force can be used without error.

  Furthermore, a screw head with a notch provided continuously through a breaking groove that breaks at the end of the thread with a certain guaranteed load, or a nut is screwed onto one end of the screw and the other end of the screw The notch part is connected through a breaking groove that breaks when a certain guaranteed load is applied to the screw. If a certain load is applied during the test, a guaranteed load test is performed on all bolts. Moreover, it can be carried out quickly and easily and continuously, and furthermore, it can be easily confirmed by visual observation that the test has passed the guaranteed load test by the fracture trace remaining at the shaft end portion of the bolt.

BEST MODE FOR CARRYING OUT THE INVENTION

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

1 to 4 show a reference example of an inspection system for an axial force guarantee bolt according to the present invention . Reference numeral 1 denotes a through hole 1a that allows a threaded portion B1 of a headed bolt B manufactured with high precision to be inserted. The supporting member 2 has two split portions 2a and 2a for gripping the screw portion B1 inserted through the through hole 1a of the support member 1. The holding portion 2a and 2a hold the screw portion B1 and pull it in the axial direction. A security load loading mechanism 3 for applying a certain security load between the head B2 and the threaded portion B1, 3 is a guideline for passing the head B2 of the headed bolt B that has passed the security load test by the security load loading mechanism 2. A paint spraying device for spraying and coloring paint T.

  The headed bolt B may be supplied to the through hole 1a of the support member 1 by a supply means (not shown) such as a shooter, a robot, or manual work. The supporting member is provided with an axial force measuring sensor 4 for measuring the axial force of the headed bolt B from the deflection acting on the supporting member when a certain guaranteed load is applied to the headed bolt B. This sensor 4 is capable of withstanding a certain axial force without breaking between the head B1 of the headed bolt B and the cylindrical shaft part B3 when measuring a certain guaranteed load, that is, passing the guaranteed load test. As a result, an open signal is sent to the paint spraying device 3, and the paint spraying device 3 is opened to spray a paint that is a standard of acceptance on the center of the upper surface of the head B2 of the headed bolt B, as shown in FIGS. It is designed to be colored as shown. The spray nozzle 3a of the paint spraying device 3 is provided so as to be movable between a spray position and a standby position. The clamping portions 2a and 2a of the security load loading mechanism 2 are formed with screw grooves on the clamping surfaces, and an opening / closing operation for grasping and separating the screw portion B1, and the clamping portions 2a and 2a as the screw portion B1. And a moving operation for pulling the screw part B1 in the axial direction.

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

  First, the headed bolt B manufactured with high accuracy is supplied to the through hole 1a of the support member 1 by a supply means such as a robot. Next, the screw portion B1 of the headed bolt B inserted through the through hole 1a of the support member 1 and projecting downward from the through hole 1a is gripped by the clamping portion of the security load loading mechanism and pulled in the axial direction. A certain secure load is applied between the screw part B1 and a secure load test is performed. When a certain guaranteed load is applied to the headed bolt B, there is no breakage between the head B1 of the headed bolt B and the cylindrical shaft part B3, and the axial force measuring sensor 4 measures a certain axial force. Only when the guarantee load test is passed, an open signal is sent to the paint spraying device 3, the paint spraying device 3 is opened, and the paint which becomes a standard of acceptance is sprayed on the upper surface of the head B2 of the head bolt B. Color. Then, after the clamping by the clamping parts 2a, 2a of the secure load load mechanism 2 is released, the headed bolt B that has passed the secure load test is accommodated from the support member 1 into a case or the like.

  Further, when a certain guaranteed load is applied to the headed bolt B, if a break occurs between the head B1 of the headed bolt B and the cylindrical shaft part B3, the headed bolt B is discharged as a defective product. In this case, the axial force measuring sensor 4 does not measure an axial force exceeding a certain value, so that an opening signal is not output to the paint spraying device 3 and the paint spraying device 3 does not spray the paint.

  The above-described guaranteed load test is performed for all head bolts B that require high accuracy, and as a result, the reliability can be remarkably improved as compared with the conventional axial force-assuring bolt inspection system that performs unremarkably. . In addition, as a security load test, the screw portion of the bolt inserted through the through hole of the support member is gripped by the clamping portion of the security load load mechanism and pulled in the axial direction, and between the bolt support member side portion and the insertion screw portion. Therefore, the secure load test can be performed easily and quickly, and the secure load test can be quickly and easily performed for all the bolts. In addition, it can be easily confirmed by visual observation of the paint T applied to the head B2 of the headed bolt B that it has passed the guaranteed load test. As a result, the user can use only the bolts that have actually passed the guaranteed load test and whose axial force is guaranteed.

  Further, when the screw part is held by the holding parts 2a and 2a, the screw part B1 or part of the screw thread is deformed over the entire length in the axial direction as shown in FIG. If the flat portion B1 ′ is formed, the flat portion B1 ′ provides an effect of preventing the bolt from loosening when the headed bolt B is screwed into the member as appropriate.

  The paint T may be applied to the top surface of the head B2 of the headed bolt B, or may be applied to the tip surface of the screw part B1 of the headed bolt B, or the top surface of the head B2 and the screw part B1. Of course, it may be applied to both of the front end surfaces. Further, instead of the paint T, marks or the like may be appropriately stamped or printed on the upper surface of the head B2 and the tip surface of the screw portion B1.

Next, an inspection system for an axial force ensuring bolt according to the present invention will be described with reference to FIGS. That is, as shown in FIG. 5, a support member 1 having a tapered wedge shape with a predetermined angle θ (4 to 10 °) is used, and the lower surface of the head B2 of the headed bolt B is attached to the wedge inclined surface 1b. In this state, a certain guaranteed load is applied by the guaranteed load loading mechanism 2 in a state where the head is easily brought into contact. The paint spraying device 3 is disposed below the screw B1 instead of above the head B2 of the headed bolt B. In this case as well, all the headed bolts B are subjected to a security load test, and the head toe does not occur in the test, and the bottom surface of the threaded portion B1 of the headed bolt B that has passed the security load test is shown in FIGS. Thus, the paint T which becomes the standard of the acceptance is applied by the paint spraying device 3, and the same effect as the above-mentioned reference example can be obtained while effectively conducting the test for the occurrence of head streaks . Further, when the screw part B1 is clamped by the clamping parts 2a, 2a, as shown in FIG. 6, a part of the screw thread is deformed over the entire axial length by the clamping parts 2a, 2a to form a flat part B1 ′. The loosening prevention effect of the bolt B is obtained.

  FIG. 8 is for inspecting the axial force of the implanted bolt U having the screw portions U1 and U2 at both ends by using the inspection system of the embodiment shown in FIG. 1 described above. In that case, the other end screw portion U2 side of the stud bolt U in which the nut N is screwed to the one end screw portion U1 is inserted into the through hole 1a of the support member 1, and the other end is held by the holding portions 2a and 2a of the security load loading mechanism 2. Grasping the threaded portion U2 and pulling it in the axial direction, a certain secure load is applied between the nut N and the other end threaded portion U2, and a secured load test is performed. The paint which becomes a standard of acceptance is applied to the end face by the paint spraying device 3. Also in this case, a security load test is performed on all the implanted bolts U, and a coating that is a standard for passing is applied to the end face of the one end screw portion U1 of the implanted bolt U that does not break and passes the secure load test. Since it is applied, the same effect as that of the above-described embodiment can be obtained in the case of the stud bolt U.

FIGS. 9 and 10 show another embodiment of the inspection system for an axial force ensuring bolt according to the present invention . The system is broken at the tip of the threaded portion B′1 of the headed bolt B ′ under a certain guaranteed load. A support member 11 having a through hole 11a that allows the insertion of the headed bolt B 'on the threaded portion B'1 side while connecting the notch portion B'4 continuously through the fracture groove B'3, and the penetration of the support member 11 The holding part 12a, 12a has a notch part B'4 penetrating through the hole 11a, and the notch part B'4 grasped by the holding parts 12a, 12a is pulled in the axial direction, so that the head part B'2 and the notch part B'4. And the end portion of the threaded portion B′1 of the headed bolt B ′ that has passed the security load test by the security load loading mechanism 12. Is a break mark B'5 which is a standard for passing. That.

  The holding portions 12a and 12a of the guaranteed load loading mechanism 12 are housed in a guide cylinder 12c having a diameter-reduced taper portion 12b at the tip, and are moved in the axial direction and in the radial direction with respect to the guide cylinder 12c. They can be opened and closed, and are normally biased in the direction of opening each other. Then, the holding portions 12a, 12a are guided by the reduced diameter tapered portion 12b to be reduced in diameter by the movement of the holding portions 12a, 12a toward the distal end side of the guide cylinder 12c, and the notched portion B'4 of the bolt B 'with a head. The notch B′4 is pulled outward in the axial direction while the pin is held, and a certain guaranteed load is applied between the head B′2 and the notch B′4. .

  In this case as well, since the guaranteed load test is performed on all of the headed bolts B ′ that require high accuracy as in the case of the above-described embodiment, the reliability is higher than that of the conventional axial force security inspection system that performs the sampling. In the test, the normal stud B 'does not break between the head B'2 and the subsequent cylindrical shaft portion, and the thread B'1 and the notch Only the fracture groove B'3 between B'4 breaks and the end of the threaded portion B'1 of the headed bolt B 'that has passed the guaranteed load test has a fracture mark B'5 that serves as a standard for passing it. . Thereby, it can be easily confirmed by visual observation of the fracture mark B′5 remaining on the shaft end portion of the threaded portion B′1 of the headed bolt B ′ that it has passed the guaranteed load test. As a result, the user can use only bolts that pass the guaranteed load test and have an axial force guaranteed.

  Further, FIGS. 11 and 12 show still another embodiment, and a certain guarantee is provided at the tip of the other end screw portion U′2 of the implanted bolt U ′ in which the nut N ′ is screwed to the one end screw portion U′1. A support member 11 having a through hole 11a that allows the other end threaded portion U'2 of the bolt U 'to be inserted while the notched portion U'4 is continuously provided through a breaking groove U'3 that is broken by a load. The holding member 12 has a holding part 12a, 12a that holds the notch part U'4 penetrating the through hole 11a of the support member 11. The holding part 12a, 12a holds the notch part U'4 and pulls it in the axial direction. The other end screw portion U ′ of the implanted bolt U ′ that has passed the security load test by the security load loading mechanism 12 is provided with the security load loading mechanism 12 that applies a certain security load to the portion U′4. Fracture mark U'5 which is a standard of acceptance at the shaft end of 2 It is obtained as remain.

  The holding portions 12a and 12a of the guaranteed load loading mechanism 12 are housed in a guide cylinder 12c having a diameter-reduced taper portion 12b at the tip, and are moved in the axial direction and in the radial direction with respect to the guide cylinder 12c. It can be opened and closed, and is normally urged through urging means (not shown) in the direction of opening each other. The holding portions 12a and 12a are guided by the reduced diameter taper portion 12b and reduced in diameter by the movement of the holding portions 12a and 12a toward the distal end side of the guide cylinder 12c, thereby holding the notch portion U'4 of the stud bolt U '. On the other hand, the notch part U′4 and the guide cylinder 12c are pulled outward in the axial direction with the pinched state, and a certain security load is applied between the head part U′2 and the notch part U′4. In addition, a fracture mark U′5 that is a standard for passing is left at the shaft end portion of the other end screw portion U′2 of the implanted bolt U ′ that has passed the guaranteed load test.

  In this case as well, the guaranteed load test is performed on all the studs U ′ that require high accuracy as in the case of the above-described embodiment. In addition, in the test, in the normal stud bolt U ′, only the fracture groove U′3 between the other end screw portion U′1 and the notch portion U′4 breaks. That is, a fracture mark U′5 that serves as a criterion for the pass remains at the shaft end portion of the other end screw portion U′1 of the implanted bolt U ′ that has passed the security load test. From this fracture mark U'5, it is easily confirmed by visual observation of the fracture mark U'5 remaining on the shaft end portion of the other end threaded portion U'1 of the stud bolt U 'that it has passed the guaranteed load test. be able to. As a result, the user can use only bolts that pass the guaranteed load test and have an axial force guaranteed.

  Note that when the notch portion is continuously provided at the tip of the screw portion through a fracture groove that is broken by a certain guaranteed load, the outer diameter of the notch portion is the outer diameter of the screw portion as described in the above embodiment. In addition to a smaller diameter, it may be the same diameter or a larger diameter.

  In the above-described embodiments, the description has been made with respect to the case where a mark or paint that gives an indication of acceptance is applied to the head or shaft end of the bolt that has passed the guarantee load test by the guarantee load loading mechanism. It is not necessary to apply or paint. In that case, for example, it is preferable that only the headed bolts that pass the guaranteed load test are accommodated in a case that clearly indicates that fact.

  In the above-described embodiment, the headed bolt and the implanted bolt in which the nut is screwed to the one end thread portion have been described. However, for example, the present invention can be applied to small terminal screws and mounting screws, for example. . Further, in each of the above embodiments, the screw end side screw portion of the bolt is clamped by the clamping portion of the security load loading mechanism and pulled in the axial direction. A nut may be screwed in advance to the free end side threaded portion, and the nut or the threaded portion on the tip side of the nut may be sandwiched by the sandwiching portion and pulled in the axial direction.

It is a longitudinal section showing a reference example of an inspection system on which the present invention is based . It is a top view of the clamping part. It is a front view of a bolt with a head. It is a top view of a bolt with a head. It is a longitudinal cross-sectional view of the headed bolt inspection system according to the present invention. It is a front view of a bolt with a head. It is a top view of a bolt with a head. It is a longitudinal cross-sectional view of the reference example of the implantation bolt test | inspection system which becomes the origin of this invention. It is a longitudinal cross-sectional view of the bolt inspection system with a head which has a notch part based on this invention. It is a longitudinal cross-sectional view which shows the test | inspection state by the system. It is a longitudinal cross-sectional view of the implantation bolt inspection system which has a notch part based on this invention. It is a longitudinal cross-sectional view which shows the test | inspection state by the system. It is conventional explanatory drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support member 1a Through-hole 1b Wedge inclined surface 2 Secure load load mechanism 2a Holding part 11 Support member 11a Through hole 12 Secure load load mechanism 12a Holding part B Head bolt B1 Screw part B2 Head B 'Head bolt B'1 Screw part B'2 Head B'3 Breaking groove B'4 Notch part B'5 Breaking mark C Stud bolt C1 Screw part C2 Head C 'Stud bolt C'1 Screw part C'2 Head C'3 Breaking groove C'4 Notch

Claims (3)

It has a support member with a through hole that allows the screw part of the headed bolt to be inserted, and a holding part that holds the screw part that is inserted into the through hole of the support member, and the screw part that is held by the holding part is pulled in the axial direction to And a supporting load load mechanism for applying a certain guaranteed load between the threaded portion and the screw portion, while the support member has a tapered wedge shape, and the bottom surface of the bolt head is provided on the inclined surface of the wedge. A certain load is applied by the guaranteed load load mechanism in the state of contact, and the mark or paint that gives a pass criterion is applied to the head of the head bolt that has passed the guaranteed load test without causing head toe. A featured axial force security bolt inspection system. A support member having a through hole that allows insertion of the head bolt on the screw portion side, while supporting a notch portion at the tip of the screw portion of the head bolt through a breaking groove that is broken by a certain guaranteed load. A security load-loading mechanism that has a clamping part that grips the notch part that penetrates the through hole of the member, and that pulls the notch part gripped by the clamping part in the axial direction to apply a certain security load between the head and the notch part. The shaft end of the headed bolt that passed the safe load test by the safe load mechanism has a fracture mark that is a standard for passing An inspection system for axial force securing bolts, characterized in that A notch part is connected to the tip of the other threaded part of the other end of the implanted bolt, in which a nut is screwed to one end thread part, via a breaking groove that is broken by a certain guaranteed load. It has a support member with a through-hole that allows insertion on the screw part side after screwing the nut, and a holding part that holds the notch part that penetrates the through-hole of the support member. It is equipped with a security load mechanism that applies a certain security load between the nut and the notch by pulling on the nut, and the shaft end of the stud that has passed the security load test by the security load load mechanism is a measure of acceptance. Inspection system for axial force guarantee bolts, characterized in that the fracture marks remain.

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