JP7094549B2 - Headed rod fixing device - Google Patents

Description

The present invention relates to a headed rod fixing device for detecting a non-regular headed rod such as a defective bolt.

This type of headed rod fixing device has conventionally been known as a device for fixing the headed rod and the work in a state where the shaft portion of the headed rod such as a bolt or a pin is inserted into the insertion hole of the work. Has been done. Such a headed rod fixing device includes, for example, a bolt welder that welds by sandwiching a headed rod and a work from above and below with a pair of electrodes arranged above and below and energizing the headed rod, or a headed rod. There is a pressurizing device that fixes the headed rod and the work by the so-called "caulking" effect of applying pressure to the head of the head to plastically deform the headed rod.

Patent Document 1 discloses a bolt welding device that makes it possible to detect a bolt having a shaft portion having a non-regular length before welding to a work. This bolt welding device includes an upper electrode that can move up and down and a lower electrode having a mounting surface on which a work is placed, and further, a lower electrode that can project from a hole opened in the above-mentioned mounting surface and has a lower electrode. It is equipped with a shaft mounting member (hereinafter referred to as "guide pin") that moves up and down inside.

In the bolt welding device, bolts are supplied onto the insertion holes of the work in a state where the insertion holes of the work are fitted into the guide pins. Then, when the head of the bolt is pushed by the upper electrode, the shaft portion of the bolt inserts the insertion hole of the work. At this time, since the guide pin descends together with the bolt, it moves downward in the lower electrode by the same distance as the bolt.

Therefore, the downward moving distance of the guide pin differs depending on whether the length of the shaft portion of the bolt is normal or non-normal. Utilizing this fact, a bolt that is not regular is detected, and the bolt is prevented from being welded to the work.

JP-A-2015-37797

However, the bolt welding apparatus of Patent Document 1 can detect a bolt having a non-regular shaft length, but cannot detect a bolt having a non-regular shaft diameter. Therefore, it is not possible to prevent the non-regular bolt from being fixed to the work.

The present invention has been made in view of this point, and an object thereof is before the non-regular headed rod having a shaft diameter smaller than the shaft diameter of the regular headed rod and the work are fixed. In addition, the non-regular headed rod is detected by a simple mechanism.

In order to achieve the above object, in the present invention, a recess smaller than the shaft diameter of the regular headed rod and larger than the shaft diameter of the non-regular headed rod is provided in the center of the top surface of the guide pin. The shaft of the non-regular headed rod was fitted into the recess.

In particular,
The headed rod having a head and a shaft portion extending from the head is inserted into the insertion hole of the work, and the head is in contact with the peripheral portion of the insertion hole of the work. Is a rod fixing device with a head that fixes the work to the work.
With an upper presser that can be moved up and down,
A lower support having a mounting surface on which the work is mounted,
A guide pin that protrudes from the mounting surface of the lower support and into which the insertion hole is fitted when the work is mounted is provided.
The headed rod is positioned on the insertion hole of the work fitted in the guide pin.
As the head is pushed by the upper retainer and the shaft portion enters the insertion hole of the work, the guide pin is immersed in the lower receiver from the above-mentioned mounting surface.
The guide pin is
In the center of the top surface, a recess smaller than the shaft diameter of the regular headed rod and larger than the shaft diameter of the non-regular headed rod whose shaft diameter is smaller than the shaft diameter of the regular headed rod. Have and
In the non-regular headed rod, the shaft portion is fitted into the recess of the guide pin, so that the depth at which the guide pin is immersed in the lower receiver becomes shallower than that of the regular headed rod. And
It is characterized by comprising a detector for detecting whether or not the immersion depth of the guide pin is the immersion depth of the regular headed rod.

As a result, if the headed rod supplied onto the insertion hole of the work fitted to the guide pin is a regular headed rod, the shaft portion thereof does not fit in the recess and is not fitted therein. The tip of the shaft portion is in contact with the upper end of the guide pin. On the other hand, in the case of a non-regular headed rod, the shaft portion thereof is in a state of being fitted in the recess. Therefore, the immersion depth of the guide pin immersed in the lower holder is shallower in the non-regular headed rod than in the regular headed rod. Therefore, it is possible to detect a non-regular headed rod by utilizing such a difference in the immersion depth of the guide pin. Therefore, when a non-regular headed rod is erroneously supplied onto the insertion hole, it is advantageous in preventing the non-regular headed rod from being fixed to the work. Further, since it is possible to detect a rod with a head that is not regular only by providing a recess on the top surface of the guide pin, it is possible to suppress an increase in cost.

The second invention is characterized in that, in the headed rod fixing device of the first invention, the recess is a round hole opened in the top surface of the guide pin.

As a result, the tip of the shaft portion of the regular headed rod stably abuts on the top surface of the guide pin. Further, the shaft portion of the non-regular headed rod is stably fitted in the recess. Therefore, when the non-regular headed rod and the regular headed rod are pushed by the upper retainer, the guide pin can be stably immersed in the lower holder.

According to the present invention, the depth of immersion of the guide pin that immerses in the lower support as the shaft portion of the headed rod enters the insertion hole of the work is detected and is smaller than the shaft diameter of the regular headed rod. You can find a non-regular headed rod with a shaft diameter. Therefore, when a non-regular headed rod is erroneously supplied onto the insertion hole of the work, the non-regular headed rod is eliminated before the non-regular headed rod is fixed to the work. It will be advantageous on. In addition, since it is possible to find a rod with a head that is not regular due to the simple structure of providing a recess on the top surface of the guide pin, it is possible to suppress an increase in cost.

It is a front view which shows the schematic structure of the bolt welding apparatus which concerns on embodiment of this invention. It is a schematic diagram which made a part of the lower electrode unit a vertical cross section. It is a top view of the guide pin adjustment bracket. It is a vertical sectional view which shows the structure of a part of the lower electrode on which a work is placed. It is a schematic diagram when a regular bolt is supplied on the insertion hole of a work. It is a schematic diagram when the non-genuine bolt is supplied on the insertion hole of a work. It is a top view which looked at the bolt holding part from the side. It is a top view of the bolt holding part. It is a front view which showed the place where the bolt holding part was located on the lower electrode. It is a schematic diagram which showed the state which the tip part of the shaft part of the normal bolt pushed by the upper electrode pushes open a bolt accommodating hole. It is a schematic diagram of the lower electrode which shows the state which the head of a regular bolt is in contact with a work. It is a schematic diagram which shows the moving distance of a piston when a regular bolt inserts a work. It is a schematic diagram of the lower electrode which shows the state which the head of a non-genuine bolt is in contact with a work. It is a schematic diagram which shows the moving distance of a piston when a non-genuine bolt inserts a work.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of preferred embodiments is merely exemplary and is not intended to limit the invention, its applications or its uses.

-overall structure-
FIG. 1 shows a schematic view of the bolt welding apparatus A according to the present embodiment. The bolt welding device A sandwiches the work W and the bolt X by electrodes arranged above and below the work W, and welds the work W and the bolt X by energizing both electrodes. The bolt welding device A includes a bolt welding machine 1, a bolt supply unit 2, and a controller 3.

<Bolt welder>
The bolt welding machine 1 includes an upper electrode unit 10 and a lower electrode unit 40 arranged so as to face each other vertically on the main body 1a.

<Structure of upper electrode unit>
As shown in FIG. 1, the upper electrode unit 10 includes an upper electrode 11, an upper holder 12, and an upper electrode cylinder 14.

The upper electrode 11 is attached to the lower end portion of the upper holder 12. The upper electrode 11 is configured to be vertically movable integrally with the upper holder 12.

The upper holder 12 is formed in a substantially cylindrical shape. The upper holder 12 is fixed to the movable portion 1b that moves up and down by the operation of the upper electrode cylinder 14 via the upper mounting member 1c.

The upper electrode cylinder 14 is arranged on the upper part of the main body portion 1a. The upper electrode cylinder 14 is an air cylinder.

<Structure of lower electrode unit>
As shown in FIG. 1, the lower electrode unit 40 includes a lower electrode 41, a lower holder 42, a guide pin adjusting bracket 48, and a guide pin cylinder 49.

As shown in FIGS. 1 and 2, the lower electrode 41 includes an electrode cap tip 44 and an electrode socket 43 for attaching the electrode cap tip 44 to the upper end of the lower holder 42.

The electrode cap tip 44 is fitted to the upper end of the electrode socket 43. The electrode cap tip 44 includes a mounting surface 46 on which the work W is mounted.

The lower holder 42 is formed in a substantially cylindrical shape, and is fixed to the main body portion 1a via the lower mounting member 1d.

The lower holder 42 includes an insulating pipe 45. The insulating pipe 45 is fixed in the electrode socket 44. The insulating pipe 45 protects the guide pin 47 from being energized from the electrode socket 44 to the guide pin 47 described later.

The guide pin adjusting bracket 48 has a substantially cylindrical shape having different outer diameters at the upper portion and the lower portion thereof, and a cylinder insertion hole 48a having a relatively small diameter is formed on the lower side of the inner circumference thereof and on the upper side. Is formed with a large-diameter holder insertion hole 48b for connecting to the lower holder 42. The cylinder insertion hole 48a is fastened to the guide pin cylinder 49.

As shown in FIG. 3, the upper portion of the guide pin adjusting bracket 48 has a half-split member 48d in which the cylinder is split in half. That is, the guide pin adjusting bracket 48 is composed of a half-split member 48d and the other main body portion 48c.

The main body portion 48c is assembled with the other half member 48d. As a result, the lower end of the lower holder 42 is sandwiched between the two members 48c and 48d, and the members 48c and 48d are fastened with bolts 48e to connect and fix the lower holder 42 to the guide pin adjusting bracket 48. There is.

The guide pin cylinder 49 includes an upper air pipe connecting portion 53 above the guide pin cylinder 49. The upper air pipe connecting portion 53 is adapted to supply or discharge air into the guide pin cylinder 49.

The guide pin cylinder 49 is provided with a lower air pipe connecting portion 54 below the guide pin cylinder 49. The lower air pipe connecting portion 54 is adapted to supply or discharge air into the guide pin cylinder 49.

The guide pin cylinder 49 includes an auto switch 60 as a detector for detecting the immersion depth of the guide pin 47. The auto switch 60 is provided between the upper air pipe connecting portion 53 and the lower air pipe connecting portion 54. The auto switch 60 is a proximity switch that detects static electricity generated by the proximity of a magnet 55, which will be described later. When the auto switch 60 detects the proximity of the magnet 55, it outputs an energization signal for welding to the controller 3.

The piston 52 moves up and down in the guide pin cylinder 49 by the air pressure supplied or discharged from the upper air pipe connecting portion 53 and the lower air pipe connecting portion 54.

The piston rod 51 is connected to the piston 52. The piston rod 51 moves up and down inside the guide pin cylinder 49 and the lower holder 42.

The magnet 55 is provided on the piston 52.

<Guide pin>
As shown in FIGS. 2 and 4, the lower electrode unit 40 includes a guide pin 47. The guide pin 47 is configured to move up and down in the insulating pipe 45. The upper end of the guide pin 47 protrudes from the mounting surface 46 so that the insertion hole Wa of the work W can be fitted. Further, when the insertion hole Wa of the work W is fitted in the upper end of the guide pin 47, the guide pin 47 is held in a state of protruding from the work W by the protrusion height h.

The guide pin 47 is connected to the rod 57 at the lower end thereof via a connecting member 58 attached to the upper end of the rod 57. The rod 57 is connected to the upper end of the piston rod 51 at its lower end. That is, the guide pin 47 is configured to move up and down integrally with the rod 57 and the piston rod 51.

As shown in FIG. 4, the guide pin 47 has a recess 59 in the center of its top surface. The recess 59 is a round hole in which the top of the guide pin 47 is open and has an inner diameter D.

As shown in FIGS. 5 and 6, the inner diameter D is designed to be smaller than the shaft diameter d1 of the regular bolt X1 and larger than the shaft diameter d2 of the non-regular bolt X2. Here, it is assumed that the shaft diameter d2 is smaller than the shaft diameter d1. That is, the tip portion X1c of the regular bolt X1 abuts on the upper end of the guide pin 47, while the shaft portion X2b of the non-regular bolt X2 fits in the recess 59, and the head portion X2a of the non-regular bolt X2 is the guide pin 47. Contact the top of the.

<Bolt supply unit>
As shown in FIG. 1, the bolt supply unit 2 is located on the side of the upper electrode unit 10 (on the right side in FIG. 1). The bolt supply unit 2 supplies the bolt X onto the insertion hole Wa of the work W mounted on the mounting surface 46.

The bolt supply unit 2 includes a bolt aligner 4. The bolt aligner 4 is connected to a hollow bolt supply tube 20. The bolt alignment 4 sends the bolts X one by one to the bolt outlet 5 located on the bolt holding portion 7, which will be described later, via the bolt supply tube 20.

As shown in FIG. 7, the bolt supply unit 2 includes a feed cylinder 6. The feed cylinder 6 is an air cylinder. The feed cylinder 6 includes a piston rod 8 inside the feed cylinder 6. The feed cylinder 6 is configured to move the bolt holding portion 7 provided at the tip of the piston rod 8 forward and backward with respect to the mounting surface 46.

As shown in FIGS. 8 and 9, the bolt holding portion 7 includes an arm portion 22 composed of a pair of arms 23, 23 that are symmetrical when viewed from directly above. The arms 23 and 23 are axially supported by the pins 26 and 26 at their base ends, respectively, and are formed so as to be openable and closable to the left and right of each other. Further, the arms 23 and 23 are configured to be urged to each other in a closed state by a spring 27 provided at the base end portion thereof.

The bolt holding portion 7 includes a finger portion 24 composed of a pair of adjacent fingers 25, 25. The fingers 25 and 25 are fixed to the tips of the arms 23 and 23 by pivot bolts 29 and 29, respectively. The fingers 25, 25 are designed to open downward to the left and right with respect to the pivot bolts 29, 29, and are provided by the tips 28a, 28a of the kick springs 28, 28 inserted through the pivot bolts 29, 29. They are being urged inward to each other.

The bolt holding portion 7 includes a bolt accommodating hole 36. The bolt accommodating hole 36 is formed at the tip of the finger portion 24. The bolt accommodating hole 36 has a relatively large diameter portion 37 having a cylindrical shape from the upper surface to the lower surface of the fingers 25 and 25 in a vertical cross section, and a tapered portion 38 formed so that the diameter is narrowed downward. It is provided with a cylindrical small diameter portion 39 having a small diameter. The bolt accommodating hole 36 is divided into two by the fingers 25 and 25. In the bolt accommodating hole 36, the head portion Xa of the bolt X is supported by the large diameter portion 37, and the tip portion Xc of the bolt X is supported by the tapered portion 38.

<Controller>
The controller 3 is for controlling the bolt welding device A at the time of bolt welding. The controller 3 is configured to detect each operation of the bolt welding device A and control the operation of the bolt welding machine 1 and the bolt supply unit 2.

-Operation of bolt welding equipment during bolt welding-
First, the operation of the bolt welding device A when welding the regular bolt X1 to the work W will be described.

The upper end of the guide pin 47 is in a state of protruding from the mounting surface 46 due to the supply of pressurized air from the air pipe connecting portion 54. An insertion hole Wa of the work W is fitted in the upper end of the protruding guide pin 47, and the work W is placed on the mounting surface 46. At this time, the upper end of the guide pin 47 is in a state of protruding from the work W, and the protruding height is the protruding height h.

Next, the bolt aligner 4 transfers the regular bolt X1 to the bolt outlet 5 via the bolt supply tube 20. The regular bolt X1 is delivered from the bolt outlet 5 to the bolt holding portion 7. The regular bolt X1 is held straight in the bolt accommodating hole 36 so that the tip of the shaft portion X1b faces downward.

As shown in FIG. 7, the feed cylinder 6 advances the bolt holding portion 7 toward the mounting surface 46. Then, the regular bolt X1 accommodated in the bolt accommodating hole 36 is positioned on the insertion hole Wa of the work W fitted in the guide pin 47.

As shown in FIG. 10, the downward movement of the upper electrode 11 pushes the head portion X1a of the regular bolt X1. As a result, the tip portion X1c of the regular bolt X1 pushes open the tip of the bolt accommodating hole 36 to the left and right and comes into contact with the upper end of the guide pin 47. At this time, since the shaft diameter d1 of the regular bolt X1 is larger than the inner diameter D, the shaft portion X1b of the regular bolt X1 does not fit in the recess 59.

As shown in FIG. 11, when the head portion X1a is further pushed by the upper electrode 11, the shaft portion X1b enters the insertion hole Wa of the work W. As the shaft portion X1b enters, the guide pin 47 is immersed in the lower electrode 41. Then, when the head X1a comes into contact with the work W, the immersion of the guide pin 47 stops. At this time, the immersion depth of the guide pin 47 is a distance equal to the distance h + L obtained by adding the length L of the shaft of the bolt X to the protrusion height h.

As shown in FIG. 12, the piston 52 that moves up and down together with the guide pin 47 moves downward and stops at the same distance h + L as the immersion depth of the guide pin 47. Since the auto switch 60 is located near the position where the piston 52 stops, it detects the magnet 55 in the vicinity. That is, the auto switch 60 detects the immersion depth at which the guide pin 47 immerses in the lower electrode 41, and outputs an energization signal for welding to the controller 3. As a result, the regular bolt X1 and the work W are energized and welded while being sandwiched between the upper electrode 11 and the lower electrode 41.

Next, the operation of the bolt welding device A when the non-regular bolt X2 is supplied to the insertion hole Wa will be described.

In the case of the regular bolt X1 until the tip portion X2c pushes the tip of the bolt accommodating hole 36 to the left and right by pushing the head X2a of the non-regular bolt X2 accommodated in the bolt accommodating hole 36 by the upper electrode 11. Is similar to.

Since the shaft diameter d2 is smaller than the inner diameter D of the recess 59, the shaft portion X2b is fitted in the recess 59, and the head portion X2a is in contact with the upper end of the guide pin 47.

As shown in FIG. 13, when the head portion X2a is further pushed by the upper electrode 11, the shaft portion X2b enters the insertion hole Wa in a state of being fitted in the recess 59. As the shaft portion X2b enters the insertion hole Wa, the guide pin 47 is immersed in the lower electrode 41. Then, when the head X2a comes into contact with the work, the guide pin 47 stops immersing. At this time, the immersion depth of the guide pin 47 is a distance equal to the protrusion height h. That is, in the non-regular bolt X2, the shaft portion X2b is fitted in the recess 59 of the guide pin 47, so that the depth of the guide pin 47 immersed in the lower electrode 41 becomes shallower than that of the regular bolt X1.

As shown in FIG. 14, the piston 52 that moves up and down together with the guide pin 47 moves downward by the protrusion height h, which is the same distance as the immersion depth of the guide pin 47, and stops. At this time, the piston 52 is located above the position of the auto switch 60. That is, since the auto switch 60 cannot detect the magnet 55, it does not output an energization signal for welding to the controller 3. As a result, the non-regular bolt X2 and the work W sandwiched between the upper electrode 11 and the lower electrode 41 are not energized and are not welded.

-Effect of embodiment-
According to the present embodiment, the penetration depth of the guide pin 47 that immerses in the lower electrode 41 as the shaft portion Xb of the bolt X enters the insertion hole Wa of the work W is detected to detect the immersion depth of the regular bolt X1. A non-regular bolt X2 having a shaft diameter d2 smaller than the shaft diameter d1 can be found. Therefore, when the non-genuine bolt X2 is erroneously supplied onto the insertion hole Wa of the work W, it is advantageous to eliminate the non-genuine bolt X2 before the non-genuine bolt X2 is welded to the work W. Further, since the non-regular bolt X2 can be found by the simple structure of providing the recess 59 on the top surface of the guide pin 47, the cost increase can be suppressed.

(Other embodiments)
In the embodiment, the recess 59 is a round hole opened in the top surface of the guide pin 47, but is not limited thereto. It may be a recess where the shaft portion X2b of the non-regular bolt X2 fits and the shaft portion X1b of the regular bolt X1 does not fit. For example, the upper end of the guide pin 47 is composed of a plurality of upright pins. It may be a thing. That is, the shaft portion X2b fits in the recess surrounded by the pin, while the shaft portion X1b abuts on the top of the pin.

In the above embodiment, the headed rod fixing device has been described as a bolt welding device, but the present invention is not limited thereto. The headed rod fixing device may be any device that sandwiches and fixes the work and the headed rod inserted into the insertion hole of the work from above and below, and fixes the headed rod and the work by the so-called "caulking effect". It may be a pressurizing device or the like.

In the above embodiment, the headed rod has been described as the bolt X, but the present invention is not limited thereto. It may be a rod with a head having a head and a shaft portion extending from the head, and may be a pin for welding. Further, it may be a caulking bolt or a caulking pin such as a clinch bolt or a clinch stud.

In the above embodiment, the auto switch 60 is provided as a detector for detecting the immersion depth of the guide pin 47, but the present invention is not limited to this. The detector may be any one that detects the immersion depth of the guide pin 47, and may be, for example, a servomotor cylinder having a cylinder encoder (numerical conversion function), a discriminant displacement sensor, or the like. Here, the servomotor cylinder is a device that converts the rotary motion of the servomotor into the linear motion of the piston rod in the cylinder, and the position of the guide pin 47 that moves up and down by the servomotor can be controlled. Further, the discriminant displacement sensor is a sensor that can discriminate the distance displacement of the piston 52 by a laser or ultrasonic waves.

In the above embodiment, it has been described that the bolt X is supplied by the bolt supply unit 2 onto the insertion hole Wa of the work W mounted on the mounting surface 46, but the present invention is not limited to this. The bolt X may be supplied on the insertion hole Wa of the work W mounted on the mounting surface 46. For example, the bolt X may be grasped by a human hand and supplied onto the insertion hole Wa of the work W. You may.

In the present invention, it is useful for a headed rod fixing device for fixing a headed rod to a work.

A Bolt Welder 1 Bolt Welder 11 Upper Electrode 41 Lower Electrode 46 Mounting Surface 47 Guide Pin 59 Recess 60 Auto Switch X Bolt X1 Regular Bolt X2 Regular Bolt Xa Head Xb Shaft X1b Regular Bolt Shaft X2b Regular Shaft of outer bolt d1 Shaft diameter of regular bolt d2 Shaft diameter of regular outer bolt D Inner diameter W Work Wa Insertion hole

Claims (2)

The headed rod having a head and a shaft portion extending from the head is inserted into the insertion hole of the work, and the head is in contact with the peripheral portion of the insertion hole of the work. Is a rod fixing device with a head that fixes the work to the work.
With an upper presser that can be moved up and down,
A lower support having a mounting surface on which the work is mounted,
A guide pin that protrudes from the mounting surface of the lower support and into which the insertion hole is fitted when the work is mounted on the previously described mounting surface.
Equipped with
The headed rod is positioned on the insertion hole of the work fitted in the guide pin.
As the head is pushed by the upper retainer and the shaft portion enters the insertion hole of the work, the guide pin is immersed in the lower receiver from the above-mentioned mounting surface.
The guide pin has a recess in the center of its top surface, and when the shaft diameter of the non-regular headed rod is smaller than the shaft diameter of the regular headed rod,
The recess is formed to limit the insertion of the shaft of the regular headed rod into the recess, while allowing the non-regular headed rod shaft to be inserted into the recess. Be done,
In the non-regular headed rod, the peripheral surface of the shaft portion is fitted in the recess of the guide pin, so that the guide pin is immersed in the lower support as compared with the regular headed rod. The guide pin is provided with a detector for detecting whether or not the immersion depth of the guide pin is the immersion depth of the regular headed rod.
A rod fixing device with a head, which is characterized by that. In the rod fixing device with a head according to claim 1,
A rod fixing device with a head, wherein the recess is a round hole opened in the top surface of the guide pin.

Images