JPH0136154Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a spring that detects whether a garter spring fitted into an oil seal is fitted into the oil seal without fail and whether it is fitted in the correct position in the axial direction. This invention relates to a detection device.

Conventionally, as shown in FIG. 1, an annular groove d is formed on the outer peripheral surface of the lip part c of an annular body b made of a rubber-like elastic material, and the lip part c is formed in the annular groove d.
The oil seal a fitted with a garter spring e that tightens the oil seal a is widely known and widely used.
When inspecting the product to see if the garter spring e is properly fitted into the annular groove d,
Conventionally, this has been done by relying on visual inspection by workers (Figure 1) or by indirect detection methods using metal detectors such as photoelectric switches (Figure 2) and proximity switches (Figure 3). It's summery. However, according to this conventional method, inspection errors may occur during visual inspection due to worker fatigue or illusions, and the photoelectric switch f may be affected by external light such as sunlight or illumination. Furthermore, the metal detector g has the drawback that detection errors occur due to detection distance setting errors of the detector g and detection sensitivity errors due to the type of garter spring e material.

In view of the above points, the present invention aims to improve detection accuracy, and includes a first detection pin attached to a grounded device body, and a first detection pin attached to the device body via an insulator. The oil seal has a second detection pin and a spring presence/absence detecting means connected to the second detection pin, and is fitted to the lip portion of the oil seal depending on the presence or absence of electricity due to the contact of both of the detection pins with the garter spring. a detection shaft that is fitted into the device main body so as to be movable in the axial direction and has a first contact at one end in the axial direction; and a spring position detecting means connected to the second contact, and the device is fitted in an incorrect position in the axial direction when the main body of the device is brought close to the oil seal. The spring detection device is configured such that the detection shaft moves relative to the main body of the device by a garter spring to bring the two contacts into contact with each other, and detects incorrect fitting of the garter spring based on the presence or absence of electricity accompanying the contact. This is what we intend to provide. In the above configuration, the second half of the incorrect fitting detection section detects whether a part of the garter spring e has come off the annular groove d and is in a state of being shifted in the axial direction (a so-called half-fitting state). It detects whether

Hereinafter, one embodiment of the spring detection device of the present invention will be described with reference to FIG. Reference numeral 1 denotes a device main body made of a conductive material and having a through hole 2 in the vertical direction into which a detection shaft 16 described later is inserted, and is held by a conveyance device 3, a part of which is shown by a broken line. , the device 3 is driven to move vertically. A pin insertion hole 4 is formed at the lower end of the device main body 1 in line with the through hole 2, and a base end portion of a first detection pin 5 is fitted into the pin insertion hole 4. A set screw 6 for the first detection pin 5 is screwed into a horizontal hole bored perpendicularly (horizontally) to the pin insertion hole 4. Further, a second detection pin 7 is attached to the lower end of the device main body 1 at a position 180 degrees symmetrical to the first detection pin 5 with the axis of the through hole 2 as the center. The detection pin 7 is attached via an insulator 8 without directly contacting the device main body 1, and protrudes vertically downward from an insertion hole 9 provided on the lower surface of the device main body 1. The insulator 8 is provided with a pin insertion hole 10 into which the base end of the second detection pin 7 is inserted.
A horizontal hole intersecting at right angles to 0 is provided, and a set screw 11 for the second detection pin 7 is screwed into the horizontal hole. One end of the set screw 11 protrudes laterally from the insulator 8, and a detection device cord mounting plate 14 is held between two set nuts 12 and 13 screwed onto the one end, and a touch switch is mounted on the mounting plate 14. A spring presence/absence detecting means 15 is connected thereto. Further, 16 is a through hole 2 of the device main body 1.
A first contact 17 having a substantially annular shape is screwed to one end in the axial direction to form a disc shape, and a push contact 18 is also integrally formed at the other end. ing. Cutouts 19 and 20 are formed on the outer peripheral edge of the pusher 18 at 180-degree symmetrical positions to prevent contact with the first and second detection pins 5 and 7. The detection axis 16
Under normal conditions, the lower surface of the device main body 1 and the presser 18
It is located at the lower end of the stroke due to the elasticity of the coil spring 21 interposed therebetween. 22 is
A second contact that faces away from the first contact 17 with a gap A in the normal state,
It is fixed to the apparatus main body 1 or the transport device 3 by a connector (not shown). The second contact 22
A spring position detection means 23, which serves as a touch switch, is connected and mounted on the top. Further, a pin fixing hole 24 is formed in the radial direction at a position slightly closer to the pusher 18 than the axial center of the detection shaft 16, and a guide pin 25 fitted in the hole 24 is inserted into the device main body 1. It is engaged with a guide groove 26 formed in the peripheral wall of the through hole 2.

In the spring detection device configured as described above, all the members other than the insulator 8 are conductive, and the device body 1 is grounded via the transport device 3. In addition, the gap A between the first and second contacts 17 and 22 in the normal state shall be maintained at 0.5 mm≦A≦φD (φD: winding diameter of garter spring e (Fig. 8)), and both The distance B between the detection pins 5 and 7 is matched to the diameter (φD) of the garter spring e (FIG. 8). For inspection, the oil seal a is placed in a position directly below the axis of the detection shaft 16 of the detection device, and the detection device is located slightly above the leading edge of both detection pins 5 and 7. The protruding shaft 16 is lowered to a height such that the lower end surface of the pusher 18 contacts the lip portion e of the oil seal a. The detection operation of the detection device is classified as follows depending on the state of the oil seal a, which is the object to be detected.

(a) When the garter spring e is fitted in the correct position (Fig. 5) Push contact 1 of the detection shaft 16 at the lower stroke limit
The ends of both detection pins 5 and 7 protruding further downward from the lower end surface of 8 contact the garter spring e, and the energization caused by this contact is confirmed by the spring presence/absence detection means 15, and the detection shaft 16 etc. The normal fitting of the garter spring e is confirmed by detecting the inoperation of the improper fitting detection section. That is, both detection pins 5 and 7
First, the fact that the garter spring e is fitted is detected by the conduction between the garter springs e, and it is confirmed that the garter spring e is fitted in the correct position by confirming that the incorrect fitting detection section is not activated. Prove.

(b) When the garter spring e is in a so-called half-latched state (Fig. 9) As shown in the enlarged view in Fig. 4, the garter spring e shifts upward in the axial direction from its normal fitted position, resulting in a so-called half-hung state. , the pusher 18 of the detection shaft 16 that has been gradually descending comes into contact with the garter spring e and is stopped from descending before the entire detection device stops descending, and the elasticity of the coil spring 21 The first and second contacts 17, 22 begin to move upward relative to the device main body 1, which continues to descend against the
Since the gap A between the two 17 and 22 is smaller than the winding diameter (φD) of the garter spring e, they come into contact with each other. By detecting the energization caused by this contact with the spring position detection means 23, it is determined that the garter spring e is in a half-loaded state.

(c) When the garter spring e is not fitted, both the detection means 15 and 23 are not energized, and the garter spring e is not fitted to the oil seal a.
It can be seen that it is not attached.

The spring detection device applies a voltage to the entire device, and directly connects the first and second detection pins 5, 7 and the push contact 18 of the detection shaft 16 to the garter spring e.
Since the configuration detects the presence or absence of the garter spring e and whether it is fitted or not based on the presence or absence of electricity caused by the contact, it eliminates detection errors caused by human error or changes in external factors as in conventional methods, and improves detection accuracy. This is something that can be improved.

As explained above, the spring detecting device of the present invention includes a first detecting section consisting of first and second detecting pins and a spring presence/absence detecting means, a detecting shaft having a first contact, and a second contact. A second detecting section consisting of a spring position detecting means and a spring position detecting means is installed to detect whether the garter spring is fitted to the oil seal and whether the garter spring is fitted at the correct position in the axial direction. Two points can be detected simultaneously with high precision, and the practical effects of the present invention are extremely large.

[Brief explanation of the drawing]

1 to 3 are explanatory diagrams showing a conventional spring detection method, FIG. 4 is a sectional view showing an oil seal in a half-applied state, and FIGS. 5 and 9 are springs according to an embodiment of the present invention. A cross-sectional view of the detection device,
FIG. 6 is a front view of the detection shaft, FIG. 7 is a bottom view of the detection shaft, and FIG. 8 is a sectional view of the garter spring. 1... Apparatus main body, 2... Through hole, 3... Conveyance equipment, 5
...First detection pin, 6, 11... Set screw, 7... Second detection pin, 8... Insulator, 12, 13... Set nut, 14... Detector cord mounting plate, 15... Spring presence/absence detection means, 16 ...detection axis, 17...first
18...Press contact, 21...Coil spring, 22...Second contact, 23...Spring position detection means, a...Oil seal, c...Lip portion, d
...Annular groove, e...Garter spring.

Claims (1)

[Scope of utility model registration request] A first detection pin attached to a grounded device body, a second detection pin attached to the device body via an insulator, and a spring presence/absence detection means connected to the second detection pin. The garter spring is capable of detecting the presence or absence of the garter spring to be fitted into the lip of the oil seal based on the presence or absence of electricity due to the contact of both detection pins with the garter spring, and is movable in the axial direction with respect to the main body of the device. a detection shaft that is fitted into and provided with a first contact at one end in the axial direction; a second contact that is disposed opposite to the first contact; and a detection shaft that is connected to the second contact. and a spring position detection means, when the device body is brought close to the oil seal, the detection shaft is moved relative to the device body by a garter spring fitted in an incorrect position in the axial direction, and the two contacts are moved. A spring detection device that detects improper fitting of a garter spring by making contact with the spring and detecting the presence or absence of electricity accompanying the contact.