JPH035893Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a crosshead fixing device for a horizontal fatigue testing machine.

(b) Prior art For example, when performing a fatigue test on a heavy test piece such as an insulator of a power transmission line and an overhead wire fitting, a pair of left and right grips 1L, which are spaced apart laterally as shown in Fig. 6, is used. A horizontal fatigue testing machine that grips both ends of a test piece with 1R is generally used.
One of the grips 1L and 1R
L is connected to an actuator 2 that repeatedly applies a load to the test piece. The other grip 1R is attached to a crosshead 4 supported by the main body frame 3. This testing machine has a pair of body frames 3 extending laterally, and a crosshead 4 is disposed between each body frame 3 and is movably guided along the body frames 3 in the length direction of the test piece.

To perform a fatigue test on a heavy specimen, the seventh
As shown in the figure, the interval between the grips 1L and 1R is made smaller than the length of the test piece TP, and both ends of the test piece TP placed on the bed 5 of the testing machine are lifted. Then, use each gripper 1L and 1R to hold the test piece TP.
Just grasp both ends. Next, when the crosshead 4 is moved in the length direction of the test piece TP and the interval between the grips 1L and 1R is made to correspond to the length of the test piece TP, the entire test piece TP is lifted up by the grips 1L and 1R. This can make you nervous.
In this testing machine, a pinion is transmission-connected to the drive mechanism 6 of the crosshead 4, and the pinion is connected to the main body frame 3.
It is easily engaged. Therefore, when the pinion is rotated by the drive mechanism 6, the crosshead 4 can be moved in the longitudinal direction of the test piece by the action of the pinion and the rack.

After that, the pin hole 7 formed in the main body frame 3
When the fixing pin 8 of the crosshead 4 is inserted, the crosshead 4 can be fixed to the main body frame 3 by the fixing pin 8. The crosshead 4 has a plurality of fixing pins 8 protruding from both sides thereof, and has a number of pin holes 7 into which the fixing pins 8 of the main body frame 3 are inserted. In order to insert the fixing pin 8 of the crosshead 4 into the pin hole 7, the crosshead 4 is moved to a predetermined position and the pinion 10 is rotated by the air cylinder 9 of the crosshead 4. The pinion 10 meshes with a rack formed on each fixing pin 8. Therefore, by the action of the pinion 10 and the rack, each fixing pin 8 can be projected from the crosshead 4 and inserted into a specific pin hole 7 of the main body frame 3.

Thereafter, when the actuator 2 is driven, a repeated load is applied to the test piece TP using one of the grips 1L, and the test piece TP can be subjected to a fatigue test. The reaction force of the load applied to the test piece TP is generated by the other grip 1R, crosshead 4 and fixing pin 8.
The reaction force is transmitted to the main body frame 3, and the crosshead 4 and fixing pin 8 receive the transmitted reaction force.

After the test, to remove both ends of the test piece TP from the grips 1L and 1R, the pinion 10 is rotated by the air cylinder 9, and the fixing pin 8 of the crosshead 4 is pulled out from the pin hole 7 of the main body frame 3. Then, the crosshead 4 is moved in the length direction of the test piece, and the interval between the grips 1L and 1R is made smaller than the length of the test piece TP. The test piece TP is relaxed between the grips 1L and 1R and placed on the bed 5 of the testing machine. Therefore, both ends of the test piece TP can be removed from the grips 1L and 1R.

However, in this fatigue testing machine, when the fixing pin 8 of the crosshead 4 is inserted into the pin hole 7 of the main body frame 3, a gap c is created between the pin hole 7 and the fixing pin 8 as shown in FIG. I can't. Therefore, when repeated loads are applied to the test piece, the fixing pin 8 slides within the pin hole 7 due to the reaction force, causing the crosshead 4 to swing back and forth, left and right, and up and down, causing its posture to collapse. .
After the test, even if the repeated load is released, the weight of the test piece TP acts on the crosshead 4 whose posture has collapsed. For this reason, when the fixing pin 8 of the crosshead 4 is removed from the pin hole 7, friction and strain occur between the pin hole 7 and the fixing pin 8, so that the fixing pin 8 may not be able to be removed.

In addition, this testing machine applies a tensile load to the test piece,
The specimens can also be tested statically. When performing a static test, the test piece is held between a pair of grips 11L and 11R.
gripped by. One grip 11L is attached to the crosshead 4, and the other grip 11L is attached to the crosshead 4.
1R is connected to the ram cylinder 12. Therefore, a tensile load can be applied to the test piece by means of the ram cylinder 12, and the test piece can be statically tested.

(c) Purpose This invention solves the above-mentioned conventional problems in this type of horizontal fatigue testing machine, and corrects the posture of the crosshead when pulling out the fixing pin of the crosshead from the pin hole of the main body frame, so that the fixing pin can be pulled out smoothly. This was done so that it could be removed.

(d) Structure This invention involves inserting a fixing pin of the crosshead into a pin hole formed in the main body frame, fixing the crosshead to the main body frame with the fixing pin, and inserting auxiliary pins into other pin holes of the main body frame. However, an elastic spring that is elastically deformed in the direction of movement of the crosshead is interposed between the auxiliary pin and the crosshead. Before inserting the auxiliary pin into another pin hole, the auxiliary pin is elastically supported in a predetermined position by the crosshead and an elastic spring, and the auxiliary pin is moved against the crosshead so that the auxiliary pin can be inserted into the other pin hole. Position. Furthermore, a jack that expands and contracts in the direction of movement of the crosshead is interposed between the auxiliary pin and the crosshead. When the fixing pin is removed from the pin hole in the main body frame, the crosshead is biased by the jack in the opposite direction to the direction in which the weight of the test piece acts on the crosshead, and the elastic spring is used to force the crosshead relative to the auxiliary pin. It is characterized by allowing physical movement.

(e) Examples Examples of this invention will be described below. Figure 1 shows the testing machine shown in Figure 6 using this invention.

In this embodiment, a pair of auxiliary pins 1 are provided on the left side of the crosshead 4, that is, on the sides of the grips 1L and 1R.
3. A pair of compression coil springs 14 and a pair of hydraulic jacks 15 are provided. Then, the crosshead 4 is inserted into the pin hole 7 formed in the main body frame 3.
A fixing pin 8 is inserted, and each auxiliary pin 13 is inserted into another pin hole 7 of each main body frame 3.
Each compression coil spring 14 and hydraulic jack 15 are connected to the auxiliary pin 1 at a position close to both side edges of the crosshead 4.
3 and crosshead 4.

As shown in FIG. 2, the auxiliary pin 13 is slidably fitted into the sleeve 16, and the sleeve 16 is fixed to two side plates 17. As shown in FIG. 3, the side plate 17 is swingably supported by a bracket 19 of the crosshead 4 by means of a support pin 18. The support pin 18 is inserted into the elongated hole 20 of the side plate 17 and the elongated hole 21 of the bracket 19, and is pressed against the wall surface of the elongated hole 21 by the disc spring 22 of the bracket 19 and the contact pin 23. long hole 20,
21, the functions of the disc spring 22 and the contact pin 23 will be described later.

The compression coil spring 14 can be elastically deformed in the direction of movement of the crosshead 4, and
It is located between 4 and 25. Each receiving member 24, 2
5 are crosshead 4 and sleeve 16, respectively.
Both ends of the compression coil spring 14 are fixed to respective receiving members 24 and 25. Hydraulic jack 1
5 is arranged to face the receiving member 26 of the crosshead 4 and is attached to the side plate 17 of the auxiliary pin 13. The crosshead 4 is guided by a guide rod 27 so as to be expandable and retractable in the direction of movement of the crosshead 4. Therefore, before the auxiliary pin 13 is inserted into the pin hole 7 of the main body frame 3, in this testing machine, the weight of the auxiliary pin 13, the hydraulic jack 15, and the side plate 17 causes the side plate 17 to swing around the support pin 18. Acts as a moment. The auxiliary pin 13 is elastically supported in a predetermined position by the crosshead 4 and the compression coil spring 14. The compression coil spring 14 receives the moment of the side plate 17, and the auxiliary pin 13 receives the moment of the side plate 17 and the compression coil spring 1.
It is elastically supported at a position where the elasticity of 4 is balanced. Further, in this embodiment, as shown in FIG. 5, an adjusting screw 29 is attached to a rod 28 fixed to the crosshead 4.
are screwed together, and a compression coil spring 31 is disposed between the rim 30 of the side plate 17 and the adjustment screw 29.
Then, the adjustment screw 29 and the compression coil spring 31
The moment of the side plate 17 is adjusted by the auxiliary pin 13, and the auxiliary pin 13 is positioned relative to the crosshead 4 so that the auxiliary pin 13 can be inserted into the pin hole 7 of the main body frame 3.

The auxiliary pin 13 is operated by hydraulic pressure supplied from a hydraulic supply rod 32. The supply rod 32 has two hydraulic flow paths 33, is inserted into the inner hole of the auxiliary pin 13, and is fixed to the side plate 17. Each hydraulic flow path 33 communicates with hydraulic chambers 34 and 35 formed by the inner hole of the auxiliary pin 13. Further, the auxiliary pin 13 is guided by two guide rods 36 so as not to rotate. A pair of limit switches 37 and 3 detect the position of the auxiliary pin 13.
8 is engaged with each guide rod 36.

In the apparatus configured as described above, both ends of the test piece TP are gripped by the grips 1L and 1R, and the crosshead 4 is moved to a predetermined position.
When the fixing pin 8 of the crosshead 4 is inserted into the pin hole 7 of the main body frame 3, the crosshead 4 can be fixed to the main body frame 3 by the fixing pin 8.

Next, when hydraulic pressure is supplied from the hydraulic flow path 33 of the hydraulic supply rod 32 to one hydraulic chamber 34, the auxiliary pin 13 is moved into the sleeve 16 by the hydraulic pressure of the hydraulic chamber 34.
from the other pin hole 7 of the main body frame 3
inserted into. Guide rod 36 of auxiliary pin 13
moves integrally with the auxiliary pin 13 to operate one limit switch 37. Insertion of the auxiliary pin 13 is thereby detected.

Thereafter, when the actuator 2 is driven, a repetitive load is applied to the test piece TP by the actuator 2, and the test piece TP is subjected to a fatigue test. However, when a load is repeatedly applied to the test piece TP, the fixing pin 8 of the crosshead 4 slides within the pin hole 7 due to the reaction force, and the crosshead 4 swings back and forth, left and right, and up and down. Therefore, even if the repeated load is released after the test, the weight of the test piece TP acts on the crosshead 4 whose posture has collapsed. For this reason,
As mentioned above, in the past, there were cases in which the fixing pin 8 could not be removed from the pin hole 7.

This device corrects the posture of the crosshead 4 and allows the fixing pin 8 to be pulled out smoothly. After the test, when hydraulic pressure is supplied to each hydraulic jack 15, each hydraulic jack 15 expands and contracts in the direction of movement of the crosshead 4 and comes into contact with the receiving member 26 of the crosshead 4. The hydraulic jack 15 presses the crosshead 4 in the direction opposite to the direction in which the weight of the test piece TP acts. The reaction force is transmitted from the auxiliary pin 13 to the main body frame 3, and the auxiliary pin 13 receives the transmitted reaction force.
Therefore, the crosshead 4 moves slightly against the weight of the test piece TP.

When the crosshead 4 moves, the side plate 17 swings around the support pin 18, which slides in the elongated hole 21 of the bracket 19 and causes the contact pin 23 to retreat. The contact pin 23 elastically deforms the disc spring 22 and allows the support pin 18 to slide. The compression coil spring 14 is connected to the crosshead 4 and the sleeve 1.
The crosshead 4 is elastically deformed between the receiving members 24 and 25 of 6 in the moving direction of the crosshead 4. This allows movement of the crosshead 4.

When the crosshead 4 moves, each fixing pin 8 slides within the pin hole 7 and is pressed against the wall of the pin hole 7. The directions in which the fixing pins 8 are pressed are the same and opposite to the direction in which the weight of the test piece TP acts on the crosshead 4.
This corrects the attitude of the crosshead 4.

Therefore, when the pinion 10 is then rotated by the air cylinder 9 of the crosshead 4,
The fixing pin 8 can be removed from the pin hole 7. Friction and strain between the pin hole 7 and the fixing pin 8 are eliminated or reduced, and the fixing pin 8 can be pulled out smoothly.

Thereafter, in order to remove the auxiliary pin 13 from the pin hole 7, the hydraulic pressure of each hydraulic jack 15 may be discharged. The return coil spring of each hydraulic jack 15 causes the hydraulic jack 15 to move to the receiving member 2 of the crosshead 4.
6, the auxiliary pin 13 is released from the reaction force of the hydraulic jack 15.

Also, when the hydraulic pressure of the hydraulic jack 15 is discharged,
The crosshead 4 is pulled by the weight of the test piece TP, and the crosshead 4 moves by an amount corresponding to the backlash of the rack and pinion of the drive device 6 and the deflection of its transmission system. The side plate 17 swings around the support pin 18, and the support pin 18 slides within the elongated hole 21 of the bracket 19. Belleville spring 22
moves the contact pin 23 forward, and the contact pin 23 follows the support pin 18. Furthermore, the long hole 20 of the side plate 17
As a result, the side plate 17 and the support pin 18 are relatively displaced. At the same time, the compression coil spring 14 is elastically deformed in the direction of movement of the crosshead 4. This allows movement of the crosshead 4. Therefore, the weight of the test piece TP is transmitted to the rack and pinion of the crosshead 4 and its transmission system, and the auxiliary pin 13 does not receive the weight of the test piece TP. Receiving member 2
The compression coil spring 14 is compressed between 4 and 25, and the auxiliary pin 13 only receives the reaction force of the compression coil spring 14. The reaction force of the compression coil spring 14 is controlled by the drive device 6, rack and pinion of the crosshead 4 to move the crosshead 4 to the test piece.
Just move it slightly in the direction opposite to the direction in which the TP's own weight acts. As a result, the compression of the helical compression spring 14 is released, and the auxiliary pin 13 is released from the reaction force of the helical compression spring 14.

Therefore, after that, the other hydraulic chamber 35 of the auxiliary pin 13 is connected from the hydraulic flow path 33 of the hydraulic supply rod 32.
When hydraulic pressure is supplied to , the auxiliary pin 13 is pulled out from the pin hole 7 and accommodated in the sleeve 16 . At the same time, the guide rod 36 of the auxiliary pin 13 moves together with the auxiliary pin 13, and the limit switch 3
Operate 8. This makes it possible to detect that the auxiliary pin 13 has been pulled out.

After that, when the crosshead 4 is moved in the length direction of the test piece, the test piece TP is held in the grips 1L and 1R.
After the test, it can be placed on the bed 5. Therefore, both ends of the test piece TP can be removed from the grips 1L and 1R.

In this embodiment, the auxiliary pin 13, the compression coil spring 14, and the hydraulic jack 15 are connected to the grip 1.
I explained what was placed on the L and 1R sides, but
Auxiliary pins, helical compression springs and hydraulic jacks may be arranged on the opposite side of the crosshead 4. When the fixing pin 8 is removed from the pin hole 7 of the main body frame 3, the cross head 4 is
is pulled in the direction opposite to the direction in which the weight of the test piece TP acts. This also allows the attitude of the crosshead 4 to be corrected. In short, a compression coil spring that elastically deforms in the direction of movement of the crosshead is interposed between the auxiliary pin and the crosshead, and the auxiliary pin is elastically supported in a predetermined position by the crosshead and elastic spring before the auxiliary pin is inserted into the pin hole of the main body frame. Then, position the auxiliary pin with respect to the crosshead so that the auxiliary pin can be inserted into the pin hole of the main body frame. Furthermore, a jack that expands and contracts in the direction of movement of the crosshead is interposed between the auxiliary pin and the crosshead, and when the fixing pin is removed from the pin hole in the main body frame, the jack moves the crosshead in the opposite direction to the direction in which the weight of the test specimen acts on the crosshead. to energize. It is only necessary to allow the crosshead to move relative to the auxiliary pin using an elastic spring. This allows the posture of the crosshead to be corrected and the fixing pin to be pulled out smoothly, and similar effects can be obtained.
Note that it is not always necessary to use a compression coil spring, and other elastic springs may be used instead.

(f) Effects As explained above, this invention allows the fixing pin to be pulled out smoothly by correcting the posture of the crosshead using the auxiliary pin and jack when the fixing pin is removed from the pin hole of the main body frame. It is possible to achieve the intended purpose. In addition, this invention allows the auxiliary pin to be elastically supported in a predetermined position by the crosshead and elastic spring before being inserted into the other pin hole of the main body frame. Since the auxiliary pin is positioned relative to the crosshead so that it can be moved, the auxiliary pin can be moved together with the crosshead. Then, the auxiliary pin can be directly inserted into another pin hole. Furthermore, the elastic spring allows relative movement of the crosshead with respect to the auxiliary pin, allowing the posture of the crosshead to be corrected without any problem. Therefore, there is no need to provide a special mechanism for supporting and moving the auxiliary pin, and the configuration can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an embodiment of this invention, Fig. 2 is an enlarged sectional view of the main part of Fig. 1, and Fig. 3 is a cross-sectional view of the main part of Fig. 2.
Figure 4 is a side view showing the relationship between the side plate, hydraulic jack and crosshead in Figure 2, Figure 5 is a side view showing the relationship between the compression coil spring and side plate in Figure 2, and Figure 6 is a side view showing the relationship between the side plate in Figure 2 and the side plate. 7 is a plan view showing a conventional horizontal fatigue testing machine, FIG. 7 is an explanatory diagram showing a state in which a test piece is gripped by the grips shown in FIG. 6, and FIG. FIG. 3 is an explanatory diagram showing the relationship between the fixing pins of the crosshead. 1L, 1R...Gripper, 2...Actuator, 3...Main frame, 4...Cross head,
7...Pin hole, 8...Fixing pin, 13...Auxiliary pin, 14...Compression coil spring, 15...Hydraulic jack.

Claims (1)

[Scope of utility model registration request] A pair of grips that grip both ends of the test piece are arranged at intervals in the lateral direction, and one of the grips is connected to an actuator that repeatedly applies a load to the test piece, and the other grip is connected to an actuator that repeatedly applies a load to the test piece. The tool is attached to a crosshead supported on the main body frame, the crosshead is guided so as to be movable in the longitudinal direction of the test piece along the main body frame, and the fixing pins of the crosshead are inserted into pin holes formed in the main body frame. In the horizontal fatigue testing machine, the crosshead is fixed to the main body frame by the fixing pin, and the crosshead and the fixing pin receive the reaction force of the load applied to the test piece. An auxiliary pin is inserted into the other pin hole, an elastic spring is interposed between the auxiliary pin and the crosshead, and the elastic spring is elastically deformed in the moving direction of the crosshead, and before the auxiliary pin is inserted into the other pin hole, the crosshead is and elastically supports the auxiliary pin in a predetermined position by the elastic spring, positions the auxiliary pin with respect to the crosshead so that the auxiliary pin can be inserted into the other pin hole, and A jack that expands and contracts in the direction of movement of the crosshead is interposed between the crossheads, and when the fixing pin is removed from the pin hole of the main body frame, the jack moves the crosshead in the direction in which the weight of the test piece acts on the crosshead. A crosshead fixing device, characterized in that the crosshead is biased in opposite directions and the elastic spring allows relative movement of the crosshead with respect to the auxiliary pin.