JP2722583B2 - Material testing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Field of the Invention The present invention relates to a material testing machine having a crosshead that moves up and down and loads a test piece.

B. Prior Art In a conventional material testing machine, as shown in FIG. 8, a cross yoke 3 is horizontally mounted on an upper end of a machine column 2 erected on a fixed table 1, and a space between the table 1 and the cross yoke 3 is provided. Both ends of the pair of screw rods 4 are rotatably held. Crosshead 5
Is moved up and down by a pair of screw rods 4, for example, a test piece TP installed between the cross yoke 3 and the crosshead 5 is loaded. Here, a load frame is constituted by the table 1, the machine pillar 2, the cross yoke 3, the screw rod 4, and the crosshead 5. Reference numeral 6 denotes a motor, and reference numeral 7 denotes a gear train that transmits the rotational force of the motor 6 to the screw rod 4.

C. Problems to be Solved by the Invention However, since the load frame is fixedly installed, the height position of the test space is constant, and it depends on the physique of the operator, the size and weight of the test piece, the test jig, etc. The test space cannot be changed to the optimum height.

The technical problem of the present invention is to make it possible to adjust the height position of a test space.

D. Means for Solving the Problems To explain the present invention with reference to FIG. 1 showing an embodiment, a material testing machine according to the present invention comprises a lower load member (for example, a table) 11 extending in a horizontal direction and a lower load member (for example, a table) 11. A load frame formed by connecting a lower load member 11 and an upper load member (cross yoke or crosshead) 12 (15) arranged in parallel with a connection member 13
50, a machine column 18 for guiding the lifting and lowering of the load frame 50, and fastening means for fastening the load frame 50 to the machine column so that the height position thereof can be adjusted.
19 and a load mechanism 130 that is installed on the load frame 50 and has a pair of screw rods 13 rotated by the driving means 22 to 24, and has a load mechanism 130 that loads the test piece by rotation of the screw rods 13. Technical issues are solved.

The invention according to claim 2 will be described with reference to an embodiment of FIG. 3. To be more specific, the worm speed reducers 32A and 32B having worm wheels WH directly connected to the screw rods 13A and 13B,
A drive unit including a drive motor 31 for driving the worm shafts WX of 2A and 32B is installed on the lower surface of the load frame 50.

E. Action Loosen the fastening means 19 and raise and lower the load frame 50 along the machine column 18 to adjust its position.
Tighten the 50 to the column 18. As a result, the test spaces SP1, 2 are at a height position suitable for the physique of the operator, for example, and workability and safety are improved.

Further, by adopting the configuration of claim 2, if the load frame 50 is fixed at a high position, adjustment and repair work of the driving means installed on the lower surface of the load frame 50 becomes easy. Further, since the worm reducers 32A, 32B are directly connected to the screw rod 13, speed fluctuations due to load fluctuations are prevented. Furthermore, claim 2
In the test machine of the above, the driving means using a worm speed reducer that can have a large and large reduction ratio can be assembled integrally with the load frame, so that the assemblability is improved and the foot space SP3 can be widely secured.

F. Embodiment-First Embodiment-Fig. 1 is a front half sectional view showing an embodiment of a material testing machine according to the present invention, in which a table 11 and a cross yoke 12 are both ends of a pair of screw rods 13. Are connected via a bearing 14. A screw rod nut 16 fixed to the crosshead 15 is screwed to the screw rod 13, and the rotation of the screw rod 13 causes the crosshead 15 to rotate.
Goes up and down. Here, a load frame 50 is configured by the cross yoke 12, the table 11, and the screw rod 13, and the crosshead 15
And the load mechanism 130 is constituted by the screw rod 13.

In addition, a pair of machine pillars 18 erected on the base 17 is a table.
11 and the cross yoke 12, the table 11 is fastened to the machine column 18 by friction fastening bolts 19, and the load frame 50 is fixed. Both ends of the crosshead 15 are guided to a machine column 18 by a guide 20. A pulley 21 is provided at the lower end of the pair of screw rods 13, and the rotation of the pulley 23 attached to the output shaft of the drive motor 22 is transmitted by a belt 24, so that the screw rod 13 rotates. The drive motor 22 is installed on the table 11. In the above embodiment, the cross yoke 12 constitutes the upper load member, the table 11 constitutes the lower load member, the screw rod 13 constitutes the connecting member, and the drive motor 22, the pulley 23, the belt 24
The driving means is constituted by, for example, and the fastening means is constituted by the fastening bolt 19.

In the test, the test piece is gripped by attaching upper and lower grips to the crosshead 15 and the table 11, respectively, or attaching upper and lower grips to the cross yoke 12 and the crosshead 15, respectively. That is, the spaces SP1 and SP2 are test spaces.

Adjust the height of the test space SP1 or SP2 with the friction fastening bolt
Loosen 19 and move the load frame 50 up and down.
The load frame 50 is fixed in place by tightening the friction fastening bolts 19. That is, the load frame 50 can move up and down along the machine column 18, and the test space can be adjusted to an arbitrary height according to the physique of the operator, the type and weight of the test piece, and the like. The expansion of the screw rod 13 due to a high-temperature test or the like can be absorbed because the cross yoke 12 can freely move in the axial direction with respect to the upper end of the machine column 18.

-Second Embodiment-Fig. 2 shows a second embodiment.

In this embodiment, a load frame 50 is formed by connecting a table 11 and a cross yoke 12 with a connection frame (connection member) 51. In other words, the screw rod 13 is simply rotated and held at both ends by the table 11 and the cross yoke 12 via the bearings 14, and does not function as a component of the load frame 50.

 Other configurations are the same as those of the first embodiment.

Third Embodiment FIGS. 3 to 5 illustrate another embodiment in which a drive system for driving the screw rods 13A and 13B includes a drive motor 31 and a pair of worm reducers 32A and 32B. FIG. In this embodiment, the load frame 50 is configured by connecting the table 11 and the cross yoke 12 with the screw rods 13A and 13B.

The drive motor 31 is held by a bracket 33 fixed to the back of the table 11 as shown in FIG. 4, and a pulley 34 is provided on the motor output shaft. Worm reducers 32A, 32B are connected to lower ends of the pair of screw rods 13A, 13B, respectively. That is, the shaft portion AX of the screw rod 13 is attached to the worm wheel WH.
Is directly connected. Each worm reducer 32 in which a worm WA (FIG. 5) meshing with the worm wheel WH is formed.
The worm shafts WX of A and 32B are connected to each other by a connecting shaft 35. A pulley 36 is provided on the connecting shaft 35, and a timing belt 37 is stretched between the pulley 34 of the drive motor 31 and the pulley 36. Therefore, the drive system thus configured is provided integrally on the lower surface of the load frame 50.

In this embodiment, the rotational force of the motor 31 is transmitted from the pulley 34, the timing belt 37, the pulley 36 to the connection shaft 35,
It is decelerated by the worm reducers 32A, 32B and the screw rods 13A, 13B
Is transmitted to

In this embodiment, the same effects as those of the embodiment of FIG. 1 can be obtained. In addition, since the drive system is constituted by the worm speed reducers 32A and 32B which are compact and have a large reduction ratio, the assemblability is further improved. As a result, the foot space below the table 1 can be secured more widely. In addition, if the load frame 50 is positioned at the uppermost position, the drive system can be easily adjusted from below, and various adjustment operations can be easily performed. Further, since the worm speed reducers 32A, 32B having high rigidity are directly connected to the screw rods 13A, 13B, the speed fluctuation of the crosshead 15 due to the load fluctuation is small. Further, noise is reduced only by the engagement between the worm and the worm wheel.

-Fourth embodiment-Fig. 6 shows a fourth embodiment.

This embodiment differs from the embodiment shown in FIGS. 3 to 5 in that the load frame 50 is modified so that the table 11 and the cross yoke 12 are connected by a connection frame 51. Unlike the third embodiment, the upper ends of the screw rods 13A and 13B are exactly the same as those described with reference to FIGS.

-Fifth Embodiment-Fig. 7 shows a fifth embodiment.

This embodiment is different from the embodiment shown in FIGS. 3 to 5 in that the table 11 is moved up and down by a hydraulic jack 61, and the other structure is the same as that of the third embodiment.

The hydraulic jack 61 is installed on the bases 17A and 17B, and the tip of the piston rod 61a is connected to the lower surface of the table 11. Loosen the fastening bolt 19 and piston rod 61a
By contracting the height of the table 11, the height of the table 11 can be adjusted. This embodiment is suitable when the load frame 50 is heavy.

In this embodiment, if the fastening bolt 19 is a hydraulic clamp type, the height adjustment and the position fixing of the load frame 50 can be automatically performed in cooperation with the hydraulic jack 61.

In addition, a nut is fixed to the table 11, and a screw portion engraved on a part of the machine column 18 is screwed to the nut, and the machine frame 18 is rotated by a separate motor to raise and lower the load frame 50. You may.

In the first to fifth embodiments, the test space is not provided between the crosshead 15 and the table 11 without the cross yoke 12.
The present invention is also applicable to a material testing machine provided with SP2. In this case, the crosshead 15, the table 11, and the screw rod 13
And a load frame, the crosshead 15 forms an upper load member, and the screw rod 13 forms a connecting member. Also, a load actuator is provided on the table 11 and the crosshead 15
The present invention is also applicable to a material testing machine in which a test piece is placed between the actuator and this actuator, and the test piece is loaded by the load actuator.

G. Configuration of the Invention Since the present invention is configured as described above, the physique of the operator,
The load frame can be raised and lowered according to the size and weight of the test piece, the test jig, and the like, and the test space can be adjusted to an optimum height position. As a result, operability and safety are improved. According to the second aspect of the present invention, the assembling workability and the adjusting workability are improved, and a foot space of the testing machine can be further secured to provide a high operability and low noise type testing machine. further,
Since the worm speed reducer having high rigidity is used, the speed fluctuation of the crosshead due to the load fluctuation is also suppressed.

[Brief description of the drawings]

1 and 2 are front half sectional views showing first and second embodiments of a material testing machine according to the present invention, and FIGS. 3 to 5 show a third embodiment, and FIG. FIG. 4 is a front sectional view, FIG. 4 is a side view of a main part thereof, FIG. 5 is an explanatory view of a worm reducer, and FIGS. 6 and 7 are front sectional views of the fourth and fifth embodiments. FIG. 8 is a front view schematically showing one example of a conventional material testing machine. 11: Table, 12: Cross yoke 13: Screw rod, 15: Cross head 16: Screw rod nut, 17: Base 18: Machine column, 19: Friction fastening bolt 22, 31: Drive motor 32A, 32B: Worm reducer 50 : Load frame, 51: Connection frame 61: Hydraulic jack, 130: Load mechanism

Claims (2)

(57) [Claims] A load frame formed by connecting a lower load member extending in a horizontal direction and an upper load member disposed above the lower load member by a connecting member, and guiding the lifting and lowering of the load frame. And a fastening means for fastening the load frame to the machine post so that the height position thereof can be adjusted, and a pair of screw rods installed on the load frame and rotated by a driving means. A material testing machine, comprising: a load mechanism that loads a test piece by rotation. 2. The drive means comprises a worm reducer having a worm wheel directly connected to a screw rod, and a drive motor for driving a worm shaft of the worm reducer. The material testing machine according to claim 1, wherein the material testing machine is installed in a machine.