KR100378416B1 - Wheel running machine - Google Patents

Abstract

The reaction roller and the reaction roller prevent long-sided wear or local wear from occurring on the rolling surface, and thus, the life of the reaction roller and the reaction liner is extended.

The jack-up spring 17 which pushes the reaction roller 10 to the reaction roller roller surface 11a by elastically supporting the reaction roller shaft 14 in the reaction roller roller surface direction is provided. The jack-up spring 17 has a structure in which the reaction roller shaft 14 is elastically supported in the reaction roller roller surface direction through the reaction roller box 15, and the reaction roller roller surface direction of the reaction roller box 15 is also provided. The structure is guided by the guide member 30. In addition, by supporting the bottom surface 15a of the reaction force roller box 15 with the sheet member 18, an excessive load action on the jackup spring 17 due to the reaction force of the load force is prevented, and the jackup spring The excessive displacement of the reaction force roller 10 by the curvature of 17 is comprised.

Description

Wheel Load Fatigue Tester {WHEEL RUNNING MACHINE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel load fatigue tester, and is useful when applied to a wheel load fatigue test on reinforced concrete slabs of road bridges.

FIG. 4 is an overall configuration diagram of a wheel load fatigue tester, FIG. 5 is a view seen from the direction of arrow A in FIG. 4, and FIG. 6 is a configuration of a conventional reaction force support mechanism (reaction roller mechanism part) provided in the wheel load fatigue tester. Fig. 7 is a plan view (Fig. 7 seen from the arrow direction E in Fig. 7 (apparatus frame is not shown)), Fig. 7 is a view seen from the arrow direction B in Fig. 6, and Fig. 8 is an enlarged cross-sectional view of part C in Fig. 7.

The wheel load fatigue tester shown in FIGS. 4 and 5 applies moving loads to the wheel load in the same manner as the actual use condition of the bridge in order to examine the durability, repair, and reinforcement of reinforced concrete slabs of road bridges. As shown in Figs. 4 and 5, the wheel load fatigue tester reciprocates the traveling unit 4 as a moving body, the device frame 7 as a support member for supporting the traveling unit 4, and the traveling unit 4. It has a drive unit 1 for making it.

The drive unit 1 comprises a drive source 1a which is an electric motor or a hydraulic motor, a coupling 1b and a speed reducer 1c which transmit the rotation of the drive source 1a to the flywheel 2. The flywheel 2 is connected to the drive unit 4 via a connecting rod 3. One end of the connecting rod 3 is freely coupled with a rotational movement around the support shaft 21 at the peripheral edge of the flywheel 2, and the other end of the connecting rod 3 is connected to the upper frame of the traveling unit 4 ( The rotational movement is freely coupled around the support shaft 22 on the side of 4a). On the other hand, the traveling unit 4 is guided to the apparatus frame 7 and is linearly reciprocated in the left-right direction (arrow (D) direction) in FIG. 4, as shown by the dashed-dotted line in FIG. Thus, the rotation of the flywheel 2 is transmitted to the traveling unit 4 via the connecting rod 3, where it is converted into a linear reciprocating motion.

In addition, the traveling unit 4 is a unit equipped with the wheel 5, and is divided into the upper frame 4a and the lower frame 4b. Inside the upper frame 4a, a hydraulic load cylinder 9 for applying a load force to the wheels 5 is equipped, and the lower frame (at the lower end) of the piston rod 9a of the load cylinder 9 is provided. 4b) is combined. In addition, the guide shaft 8 protrudes and is provided in the lower frame 4b, and these guide shafts 8 are free to slide up and down with the guide part 23 provided in the upper frame 4a. Insertion is through. Therefore, when the piston rod 9a of the load cylinder 9 strokes up and down, the lower frame 4b is guided to the guide shaft 8 and moves up and down. The wheel 5 is rotatably supported around the support shaft 24 by the lower frame 4b, moves up and down together with the lower frame 4b, and also includes a test body 6 such as a reinforced concrete upper plate of a road bridge. ) You can roll the prize.

Therefore, in this wheel load fatigue tester, when the flywheel 2 is rotated in the drive unit 1, the rotation of the flywheel 2 is transmitted to the travel unit 4 so that the travel unit 4 moves in the direction of the arrow D. The wheels 5 are rolled in the same direction on the test piece 6. When the load cylinder 9 is stroked (expand the piston rod 9a downward) at this time, the load force is transmitted to the test body 6 via the wheels 5. In this way, the moving load is applied to the test body 6 by the wheel load, and the fatigue test of the test body 6 is performed.

On the other hand, the reaction force of the load force applied to the test body 6 at the time of the said test is transmitted to the apparatus frame 7 via the reaction force roller 10 equipped in the upper part of the upper frame 4a. Specifically, the reaction frame liner 11 is equipped with the apparatus frame 7 so that replacement is possible, and the surface (lower surface) 11a of this reaction liner 11 becomes the rolling surface of the reaction roller 10. . Therefore, at the time of the said test, the reaction reaction roller 10 rolls on the reaction reaction roller rolling surface 11a in the state in which the reaction roller 10 was pushed to the reaction roller rolling surface 11a by reaction force of the said load force. In this way, the reaction force of the said load force is transmitted to the apparatus frame 7 via the reaction force roller 10.

And the structure of the conventional reaction force roller mechanism part in this reaction force support mechanism is as showing in FIGS. That is, as shown in these figures, the reaction force roller 10 is equipped with four wheels a total of two wheels each on both sides of the movement direction (arrow D direction) of the upper frame 4a, and all of the upper frame 4a Rotation is freely supported by the bearing 25 to the reaction force roller shaft 14 fixed to it.

And the support roller 12 and the guide roller 13 are also provided in the upper part of the upper frame 4a. The support roller 12 is freely rotated around the horizontal support shaft 26, and hangs on the upper surface 7a of the apparatus frame 7 so as to be able to roll the upper surface 7a. The guide roller 13 is freely rotatable around the vertical support shaft 27, and abuts against the side surface 7b of the apparatus frame 7 so as to be able to roll on the side surface 7b. Therefore, when the load force is not applied to the test body 6, the running unit 4 is supported by the apparatus frame 7 in the state suspended by the support roller 12. As shown in FIG. In addition, when the traveling unit 4 reciprocates, the horizontal movement of the traveling unit 4 is restricted by the guide roller 13.

However, in the conventional reaction force supporting mechanism, since the reaction force roller 10 is a four-wheel fixed structure attached to the upper frame 4a via the reaction force roller shaft 14 fixed to the upper frame 4a, each reaction force The roller 10 has no degrees of freedom. Therefore, the contact of the reaction force roller 10 to the reaction force liner 11 (the reaction roller rolling surface 11a) is caused by the unbalance of the pushing force with respect to each reaction force roller 10 and the one-sided contact phenomenon of the reaction force roller 10. Becomes uneven. In addition, in the moving end of the traveling unit 4, the floating phenomenon occurs due to the load variation accompanying the change in the action force of the connecting rod 3 to the traveling unit 4.

For this reason, partial wear or local wear occurs in the reaction force roller 10 and the reaction force liner 11 (the reaction roller rolling surface 11a), which limits the life of the reaction force roller 10 and the reaction force liner 11, Early exchange was needed.

Accordingly, the present invention, in consideration of the above problems, the wheel load having a reaction force support mechanism capable of preventing the occurrence of partial wear or local wear on the reaction roller and the reaction roller rolling surface to achieve a long life of the reaction roller and the reaction liner The task is to provide a fatigue tester.

BRIEF DESCRIPTION OF THE DRAWINGS The top view which shows the structure of the reaction force support mechanism (reaction roller mechanism part) in the wheel load fatigue tester which concerns on embodiment of this invention.

FIG. 2 is a cross-sectional view taken along the line F-F in FIG. 1;

3A is an enlarged sectional view of portion H of FIG. 1, and FIG. 3B is an enlarged sectional view of portion I of FIG. 2;

4 is an overall configuration diagram of a wheel load fatigue tester,

5 is a view seen from the arrow direction A of FIG.

Fig. 6 is a plan view showing the structure of a conventional reaction force support mechanism (reaction roller mechanism portion) provided in the wheel load fatigue tester;

FIG. 7 is a view seen from a direction B of FIG. 6;

8 is an enlarged cross-sectional view of part C of FIG. 7.

* Description of the symbols for the main parts of the drawings *

1: drive unit

1a: drive source (electric motor or hydraulic motor)

1b: coupling 1c: reducer

2: flywheel 3: connecting rod

4: drive unit 4a: upper frame

4a-1: part of the upper frame 4b: lower frame

5: wheel 6: test body

7: Device frame 7a: Top of the device frame

7b: Side 8: Guide shaft of device frame

9: bushing cylinder 9a: piston rod

10: Reaction Roller 11: Reaction Liner

11a: reaction roller rolling surface 12: support roller

13: guide roller 14: reaction roller shaft

15: reaction roller box 15a: bottom surface of reaction roller box

15b: Side 16: Guide liner on reaction roller box

17: Jack up spring 18: Seat member

21, 22, 24, 26, 27: support shaft 25: bearing

30: guide member

The wheel load fatigue tester of the first invention which solves the above-mentioned problems is a wheel load fatigue tester which performs a fatigue test of the test body by applying a moving load to the test body by the wheel load through a wheel provided on the moving body. A wheel load fatigue tester having a reaction force support mechanism configured to transmit a reaction force of a load load to a support member having a rolling surface of the reaction reaction roller through a plurality of reaction rollers installed on the moving body. Each of the reaction rollers is provided with an elastic member which pushes the reaction roller onto the reaction roller roller surface by elastically supporting the reaction roller shaft in the reaction roller roller surface direction.

Further, the wheel load fatigue tester of the second invention, in the wheel load fatigue tester of the first invention, by supporting the reaction roller shaft with a reaction roller box, the elastic member through the reaction roller box to the reaction roller shaft through the reaction roller box It is characterized in that the structure is elastically supported in the rolling surface direction, and further configured to guide the movement of the reaction force roller box in the reaction roller rolling surface direction by the guide member by the elastic support of the elastic member.

Further, the wheel load fatigue tester of the third invention, in the wheel load fatigue tester of the second invention, by supporting the bottom surface of the reaction force roller box with a sheet member, excessive load to the elastic member due to the reaction force of the load force It is characterized in that it is configured to prevent the load action, and to control the excessive displacement of the reaction roller by the bending of the elastic member.

Embodiment of the Invention

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail based on drawing. Here, the reaction force supporting mechanism in the wheel load fatigue tester will be described in detail, and the rest of the structure of the wheel load fatigue tester is the same as that shown in Figs.

BRIEF DESCRIPTION OF THE DRAWINGS The top view which shows the structure of the reaction force support mechanism (reaction roller mechanism part) in the wheel load fatigue tester which concerns on embodiment of this invention (sectional drawing seen in the direction of the arrow of GG line of FIG. 2), FIG. 3A is an enlarged cross-sectional view taken along the line H in FIG. 1 (FIG. 3B is a cross-sectional view taken along the line JJ in FIG. 3B), and FIG. 3B is an enlarged cross-sectional view taken along I in FIG. 2.

As shown in these figures, a reaction force roller (4 wheels) is provided in the upper frame 4a of the traveling unit 4 in total by two wheels on both sides of the moving direction (arrow D direction) of the upper frame 4a. 10) a reaction roller shaft 14 for supporting these reaction rollers 10 freely in rotation, a reaction roller box 15 for supporting these reaction roller shafts 14, and a reaction roller box 15 for these Jack-up spring 17 for elastically supporting upward, guide member 30 for guiding reaction roller box 15 in the vertical direction, and sheet member 18 for supporting bottom surface 15a of reaction roller box 15. ) Is provided.

The reaction force roller shaft 14 has its axial direction disposed at right angles to the travel unit movement direction (arrow (D) direction), and both ends thereof are fixed to the reaction force roller case 15. The reaction roller 10 is rotatably supported by the bearing 25 to each reaction roller shaft 14.

The jack-up spring 17 is sandwiched between the bottom face 15a of the reaction roller box 15 and a part 4a-1 of the upper frame 4a (see FIG. 3B), and the bottom face 15a is provided. ) Is located at the four corners of (see FIG. 1). These jack-up springs 17 push the reaction force roller 10 to the reaction force roller rolling surface 11a by elastically supporting the reaction force roller shaft 14 in the direction of the reaction roller rolling surface via the reaction roller box 15. . Then, the action force (spring force) in the jack-up spring 17 at this time is received by the support roller 12.

In addition, the sheet member 18 is fitted between the bottom surface 15a of the reaction roller box 15 and the part 4a-1 of the upper frame 4a, and is provided with no interference with the jack-up spring 17. It is arrange | positioned at an appropriate position. Usually, the sheet member 18 prevents an excessive load action on the jack-up spring 17 due to the reaction force of the load force, and also prevents the reaction roller 10 from bending by the jack-up spring 17. It is supposed to control overdisplacement.

The guide member 30 is a co-shaped member in plan view, and a guide liner 16 is provided on its inner surface. And the side surface 15b of the reaction roller box 15 is fitted with this guide member 30, and the side surface 15b of the reaction roller box 15 and the guide liner 16 contact | connect freely. That is, the reaction force roller box 15 is restricted by the guide member 30 in the traveling unit moving direction and the direction orthogonal to the same direction, and the reaction force roller rolling as shown by the arrow K in FIG. 3B. Guided in the plane direction.

As mentioned above, according to the wheel load fatigue tester which concerns on this embodiment, the following action and effects can be acquired.

As described above (see the prior art column and FIGS. 4 and 5), the load cylinder 9 is hydraulically stroked to transmit the load force to the test body 6 via the wheels 5 to the test body 6. When the moving load is applied to the wheel load, the reaction force roller 10 is pushed to the reaction force roller rolling surface 11a by the reaction force of the load force at this time. At this time, the left and right reaction force rollers 10 provided on one end side or the other end side of the upper frame 4a have an unbalanced reaction load or a connecting rod acting on the traveling unit 4 at the moving end of the traveling unit 4. The floating phenomenon due to the load change due to the change of the action force from (3) is about to occur.

On the other hand, in this embodiment, the reaction force roller 10 is supported by the reaction force roller rolling surface 11a by elastically supporting the reaction force roller shaft 14 with respect to the four-wheel reaction force roller 10, respectively, in the reaction roller rolling surface direction. By providing the jack-up springs 17 to be pushed to each other, since each reaction force roller 10 is independently pushed up (elastically supported) by the jack-up springs 17, any reaction force roller 10 can be moved. Is always reliably pushed against the reaction roller rolling surface 11a. Thus, occurrence of partial wear or local wear can be prevented on the reaction force roller 10 and the reaction force liner 11 (the reaction roller rolling surface 11a), and the exchange frequency thereof can be reduced.

In addition, in this embodiment, by supporting the reaction roller shaft 14 by the reaction roller box 15, the spring 17 for jack up makes the reaction roller roller 14 move the reaction roller roller 14 through this reaction roller box 15. The structure is elastically supported in the plane direction, and the movement of the reaction roller box 15 in the direction of the reaction roller rolling surface by the elastic support of the jack-up spring 17 is guided by the guide member 30. Therefore, the reaction force roller 10 can be moved to the reaction force roller rolling surface direction more reliably, and can be pushed to the reaction force roller rolling surface 11a.

In addition, in this embodiment, by supporting the bottom surface of the reaction roller box 15 with the sheet member 18, the excessive load action to the jack-up spring 17 by the reaction force of a load force is prevented, and also a jack The excessive displacement of the reaction force roller 10 due to the bending of the up spring 17 can be controlled.

As described above in detail with the embodiments of the invention, the wheel load fatigue tester according to the first aspect of the invention has a wheel load for performing a fatigue test of the test body by applying a moving load as a wheel load to the test body through a wheel provided on the moving body. As a fatigue tester, a wheel load provided with a reaction force support mechanism configured to transmit a reaction force of a load force applied to the test body to a support member having a rolling surface of the reaction force roller through a plurality of reaction rollers provided on the movable body. In the fatigue tester,

Each of the plurality of reaction rollers is provided with an elastic member for pushing the reaction roller to the reaction roller roller surface by elastically supporting the reaction roller shaft in the reaction roller roller surface direction.

Therefore, according to the wheel load fatigue tester of the first aspect of the invention, since each reaction force roller is independently supported by an elastic member and is movable, any reaction force roller is always reliably pushed to the reaction roller rolling surface. Thus, occurrence of partial wear or local wear on the reaction roller and the reaction roller rolling surface (reaction liner, etc.) can be prevented, and the exchange frequency thereof can be reduced.

Further, the wheel load fatigue tester of the second invention, in the wheel load fatigue tester of the first invention, by supporting the reaction roller shaft with a reaction roller box, the elastic member through the reaction roller box to the reaction roller shaft through the reaction roller box It is characterized in that the structure is elastically supported in the rolling surface direction, and further configured to guide the movement of the reaction force roller box in the reaction roller rolling surface direction by the elastic support of the elastic member by the guide member.

Therefore, according to the wheel load fatigue tester of the second invention, the reaction force roller can be moved more reliably in the reaction force roller rolling direction by the guide member of the reaction force roller box by the guide member, and can be pushed to the reaction roller rolling surface.

Further, the wheel load fatigue tester of the third invention, in the wheel load fatigue tester of the second invention, by supporting the bottom surface of the reaction force roller box with a sheet member, excessive load to the elastic member due to the reaction force of the load force It is characterized in that it is configured to prevent the load action, and to control the excessive displacement of the reaction roller by the bending of the elastic member.

Accordingly, according to the wheel load fatigue tester of the third aspect of the present invention, the sheet member prevents the excessive load action from the load force to the elastic member due to the reaction force of the load, and the excessive displacement of the reaction force roller due to the bending of the elastic member. Can be controlled.

Claims (3)

A wheel load fatigue tester which performs a fatigue test of the test body by applying a moving load to the test body by a wheel load through a wheel provided on the moving body, wherein the reaction force of the load force applied to the test body is provided in the plurality of moving bodies. In a wheel load fatigue tester having a reaction force support mechanism configured to transmit through a reaction force roller to a support member having a rolling surface of the reaction force roller, And a resilient member that pushes the reaction roller to the reaction roller rolling surface by elastically supporting the reaction roller shaft in the reaction roller rolling direction with respect to the plurality of reaction rollers, respectively. The elastic member has a structure in which the reaction force roller shaft is elastically supported in the reaction force roller rolling direction through the reaction force roller box, and the elasticity of the elastic member. Wheel loading fatigue tester, characterized in that the guide member to guide the movement in the direction of the reaction roller rolling surface of the reaction roller box by the support member. The method according to claim 2, wherein the bottom surface of the reaction force roller box is supported by a sheet member, thereby preventing an excessive load action on the elastic member due to the reaction force of the load force, and the reaction force roller caused by the bending of the elastic member. Wheel load fatigue tester, characterized in that configured to control the excessive displacement.