JPH0422843A - Stud strength testing device - Google Patents

Abstract

PURPOSE:To surely judge the normal/defective condition of a stud by operating a push/pull mechanism by engaging an engaging body with the stud welded on a steel plate. CONSTITUTION:A supporting lever 1 is constituted by fitting a draw-in/out lever 12 in a pipe body 11, and the length of the supporting lever 1 is adjusted by controlling the amount of protrusion of the draw-in/out lever 12, and the pipe body 11 and the draw-in/out lever 12 are fixed by inserting a pin to a hole part 13. Thence, a post 2 is mounted on the pipe body 11, and a post 3 is mounted on the draw-in/out level 12 via a pin 31, and the engaging bodies 41, 42 are engaged with the stud S by mounting on one terminal parts of the posts 2, 3. The push-pull mechanism 5 provided between the other terminal pats of the posts 2, 3 is operated, and when a prescribed force in a direction to approach or separate is applied to the engaging bodies 41, 42, the prescribed force can be applied to two studs simultaneously. Therefore, by setting the push-pull mechanism 5 so as to apply a force equivalent to design strength to the stud S by a driving force control means, it is possible to judge the device in which the stud comes off or a joining part is peeled as a defective one.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to an apparatus for testing whether the joint strength of a stud welded to a base material such as a steel plate satisfies a predetermined strength.

[Conventional technology 1] When it is desired to install a lining material on the inner surface of the hopper of a ship's hold, the sliding surface of the chute, etc., to prevent wear of the above surfaces due to friction with lumps or granular materials, bridging phenomenon of granular materials, etc. ,
A synthetic resin plate with excellent lubricity, such as ultra-high molecular weight polyethylene resin, is used as the lining material, and numerous parts of the lining material are pressed through studs welded to the surface of the steel plate, or nuts and caps attached to the studs. It may be fixed.

When installing lining materials in this way, if the bonding strength of the studs to the steel plate surface is lower than the design strength, problems such as the studs falling off prematurely may occur. It is necessary to test whether the joint strength of the stand joined to the steel plate surface by welding satisfies a predetermined strength.

Conventionally, this test has been performed by visual observation.

This involves visually observing traces of gas flow remaining in the weld bead and its surroundings, and empirically determining the quality of the joint. In addition, there were cases in which a hammer was held in the hand and the stud was struck, and the feel and impact at the time were used to determine whether the stud would fall off or not.

[Problem to be solved by the invention M1 However, the number of studs required to install lining material on the inner surface of the hopper is an enormous number of thousands or tens of thousands, and it is difficult to visually observe each stud one by one. The work of hammering and hitting with a hammer is extremely troublesome and difficult work that requires a lot of effort and time. Furthermore, the methods of visual observation and hammer blows not only require skill, but even experienced individuals are subject to individual differences in judgment, and they require testing a large number of studs. There are many times when you make a mistake in your judgment.

The present invention has been made in view of the above circumstances, and it not only makes it possible to significantly reduce the labor and time required for testing, but also allows for the evaluation of objective test results that are related to work proficiency and individual differences. The purpose of the present invention is to provide a stud strength testing device that can be used as a standard product.

[Means for Solving the Problems 1] The stand strength testing device of the present invention includes an engaging body that is fitted into two different studs at one end and the other end of a push/pull mechanism such as a cylinder. drive force control means for applying a predetermined force in the approach direction or the separation direction by operating a push/pull mechanism to each of the engaging bodies engaged with the two stands; It has the following.

[Function j] According to this configuration, the force applied to each of the engaging bodies engaged with the two stands is set to a predetermined force by the driving force control means, and the force applied to each of the engaging bodies engaged with the two stands is set to a predetermined force, and the respective retaining bodies are applied to the two studs. When the push-pull mechanism is activated by engaging each stud separately, a predetermined amount of force is simultaneously applied to the two studs. Therefore, if the force set by the driving force control means is set to, for example, the design strength of the stud, if the stud joint strength does not meet the design strength, the stud may fall off or the joint may peel off. is determined to be a defective product, and if the design strength is met, the stud will not fall off or the joint will peel off, and it will be determined to be a good product.

(Example j Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing a state in which a stud strength testing device according to an embodiment of the present invention is used in a main body of the device. In the same figure, 1 is a support rod, which includes a pipe body 11 and this pipe body 11.
The length of the support rod 1 as a whole can be adjusted by increasing or decreasing the width of the projection 12 from the pipe body 11. As a means for fixing the pipe body 11 and the office departure/exit 12, holes 13 are provided at multiple locations in the longitudinal direction of the pipe body 11, and holes (
(not shown), and inserting a bottle or the like into one of the holes 13 of the pipe body 11 and the hole of the office entry/exit 12. Note that other methods such as using a set screw as the fixing means may be adopted. Further, the support rod 1 may not be able to expand or contract.

A first post 2 is attached to the pipe body 11 of the support rod 1, and a second post 3 is swingably attached to the entrance/exit 12 of the support rod 1 via a bin 31. A first retainer 41 and a second retainer 42 are separately attached to one end of the second post 3. As shown in FIG. 2, the second engaging body 42 has a fitting portion 43 with a round hole.
The fitting portion 43 can be engaged with the stud S in a fitting manner. The same applies to the first holder 41.

A cylinder 5 is provided between the other ends of the first post 2 and the second post 3. That is, the cylinder tube 5
The base end of the piston rod 54 is connected to the first post 2 through a fitting 52 and a pin 53 so as to be relatively swingable, and the distal end of the piston rod 54 is connected to the second post 3 through a tip fitting 55 and a pin 56 so as to be relatively swingable. Connected so that they can swing freely. The working fluid of the cylinder 5 may be air or a fluid other than air such as water or oil.

The stud S is welded to a steel plate 100 on which a lining material R is provided. Then, the first engaging body 41 and the second retaining body 42 are connected to two studs SIS that undergo a strength test at the same time.
are engaged with each other in a mating manner.

By the way, a large number of studs S, which are welded to the steel plate 100 when lining the inner surface of a ship's hopper, are arranged in a regular grid, and the mutual spacing between adjacent studs S, S in two rows is small. are the same or almost the same everywhere.

Therefore, once the length of the support rod 1 is adjusted, the first holding body 4 can be adjusted to the two studs S, S at any location.
1 and the second holding body 42 can be engaged with each other in a fitting manner. In addition, the symbol indicates a welded part.

The pressure of the working fluid supplied to the cylinder 5 is set to a predetermined value by a driving force control means to be described later.

It is now assumed that the set value by the driving force control means is set to the design strength of the welded part of the stud S, and that during the test the cylinder 5 is controlled to operate in the direction of protruding the piston rod 54. Then, with the start of the test, a force in the protruding direction is applied to the piston rod 54 by the operation of the cylinder 5. Then, since the protruding force of the piston rod 54 is converted into a rotational force about the pin 31 of the second post 3, the two studs s,
The first holding body 41 and the second holding body 4 are respectively engaged with s.
2 are urged toward each other.

At this time, if the strength of the welded part of either the left or right stud S does not satisfy the above design strength, the welded part of that stud S may be sheared and peeled off, and the stud S may fall off. As a result, the sheared stud S at the welded part is judged to be a defective product. If the strength of both studs S and S's welded part -9 does not satisfy the above design strength, either Only the weld on one stud S may be sheared, while the weld on the other stud S may not experience such shear. However, in that case, if a stud S with a weld that did not shear is tested in combination with another stud, the test will cause shear in the weld of that stud S, indicating that it is a defective product. It is judged that.

If both the studs S, S are of good quality, no change will appear in their welded part -8-.Therefore, when a force equivalent to the above set value is applied to the stands S, S, the Sound the buzzer with a signal indicating that
If a light emitter like D is turned on, the test can be completed within exactly 1 m, and immediately after the test is completed, it is possible to move on to testing the other two stands.

In the above, the cylinder 5 is the piston rod 5 during the test.
Although the case has been described in which the cylinder 5 is controlled to operate in the direction of protruding the piston rod 54, the same applies even if the cylinder 5 is controlled to operate in the direction of retracting the piston rod 54 during the test.

Next, the driving force control means will be explained.

Figure 3 is a pneumatic circuit diagram of a driving force control means in which both the protruding and retracting movements of the piston rod 54 of the cylinder 5 are controlled by air pressure, where V is a spring return type 5-boat switching valve. and the piston rod 54
The protrusion speed of the piston rod 54 is adjusted by the speed controller C1, and the entry speed of the piston rod 54 is adjusted by the speed controller C7. In addition, the air supply source such as a compressor and the switching valve v1
A pressure control valve V2 and a pressure switch PS with contacts are interposed between the two.

Furthermore, a muffler S is connected to the exhaust port of the switching valve V. Furthermore, a limit switch LS is attached to the piston rod 54.

FIG. 4 is a sequence control circuit diagram of the driving force control means, where B is a push button that is closed at the start of the test, T is a timer for setting the measurement end time, Tt is a timer for setting the check time, The relationship is T, >T. XI+ Xz, Xs are relays, S respectively
QL is the solenoid of the switching valve V, and BZ is the buzzer.

In such a driving force control means, the test pressure, that is, the above set value is set by the pressure control valve v2. Then, when push button B @ON is turned on, solenoid SQL
is turned ON, the switching valve v1 is switched, the piston rod 54 of the cylinder 5 is pushed in the projecting direction, and force is applied to the two studs simultaneously.

Here, if the stud is of good quality, the pressure switch PS is turned on by the air pressure at that time, and the limit switch LS is maintained in the off state. When the time set by the timer T2 has elapsed, a buzzer BZ sounds to notify that the switch is a good product and that the test has been completed.

If the stud is defective, the welded part of the stud will peel off or the stud will come off, so the pressure switch PS
is not turned on and remains off, or even if the pressure switch PS is turned on, the piston rod 54 protrudes excessively and the limit switch LS is turned on. In this case, buzzer BZ does not sound.

Regardless of whether the stud is good or defective, after the time set by timer T+ has elapsed, solenoid SQL is turned OFF, switching valve ■1 is switched to the state shown in Figure 3, and the piston port is turned off. - The pressing force on the tip 54 in the protruding direction is released, and preparations are made for the next measurement.

Although the cylinder 5 is used as the push/pull mechanism in this embodiment, any push/pull mechanism may be used as long as its operation can apply a predetermined force in the approaching or separating direction to the two engaging bodies. Other means may also be used. Also,
The first work-holding body 41 may be directly provided on the cylinder tube 51 of the cylinder 5, and the second work-holding body 42 may be directly provided on the piston rod 54.

[Effect of the Invention 1] As described above, according to the present invention, the simple operation of engaging the engaging body with each of the two studs welded to a steel plate or the like to operate the push/pull means, This has the effect that it is possible to reliably and objectively judge whether each of the two studs is a good product or a defective product.

Therefore, compared to the conventional method of testing the strength of studs one by one by visually observing them or hitting them with a hammer, this method not only significantly reduces the labor and time required for testing, but also provides objective test results. This method has the advantage that operator skill levels and individual differences are less likely to appear in the test results.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the usage state of the main body of the stud strength testing device according to the embodiment of the present invention, Fig. 2 is a plan view of the main part of the engaging body, and Fig. 3 is a pneumatic circuit diagram of the driving force control means. , 4th
The figure is a sequence control circuit diagram of the driving force control means. A...Device main body, 5...Cylinder (push/pull mechanism), 4
1... first conjugate, 42... second conjugate, S...
stud.

Claims (1)

[Claims] 1. A device body in which engaging bodies that are fitted into two different studs are connected to one end and the other end of a push/pull mechanism such as a cylinder, and the two studs. A stud strength testing device characterized by having a driving force control means for applying a predetermined force in an approaching direction or a separating direction to each engaged member by activating a push/pull mechanism.