JP3430710B2 - Material testing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention measures the strength of a material by applying a tensile force or a compressive force to a test piece by driving a cross head by rotating a screw rod. It relates to a material testing machine. [0002] Mechanical properties of a material can be examined by applying a tensile force or a compressive force to a test piece and analyzing the deformation amount of the test piece and the load applied to the test piece. As a material tester capable of applying a tensile force or a compressive force to a test piece as described above, a material tester having a mechanism for linearly moving a crosshead is known. FIG. 3 is a front view showing a conventional material testing machine of this type. In FIG. 3, a pair of left and right columns 2 are erected on a fixed table 1, and a cross yoke 3 is suspended on an upper portion of the columns 2. A pair of right and left screw rods 4a and 4b are erected between the fixed table 1 and the cross yoke 3, and each screw rod 4a and 4b has a pair of nuts (not shown) provided on both sides of the crosshead 5. The crossheads 5 are screwed to each other and supported by the screw rods 4. A motor 6 is provided in the fixed table 1. The driving force of the motor 6 is transmitted to the screw rods 4a and 4b via a transmission device T including a timing belt (belt) 7, a shaft 8, and worm-type speed reducers 9a and 9b. Is transmitted. On the upper surface of the fixed table 1 and the lower surface of the crosshead 5, for example, upper and lower platens 1 for a compression test are provided.
0 and 11 are attached to face each other. When a test piece (not shown) is positioned between the upper and lower platens 10 and 11, and the motor 6 is driven to rotate in a predetermined direction, the screw rod 4a is rotated by the rotation. , 4b rotate in the same direction, and the crosshead 5 screwed with them rotates down. As a result, the space between the upper and lower platens 10 and 11 is narrowed, and a compressive load is applied to the test piece. The compression load is measured by a load cell 12 interposed between the crosshead 5 and the upper platen 10. [0005] However, in the conventional material testing machine, since only the shaft 8 cannot be removed, a complicated operation is required when replacing the timing belt 7. An object of the present invention is to provide a material testing machine which can easily replace a belt without requiring complicated operations. SUMMARY OF THE INVENTION The present invention provides a motor, a belt for transmitting the rotation of the motor, and a pair of screw rods which receive a force from the belt and transmit a force to a pair of screw rods. The present invention is applied to a material testing machine including a transmission device for rotating a screw rod. The transmission device is attached to the first member that rotates while engaging with the belt and transmits a rotational force to one of the pair of screw rods, and is rotatably mounted coaxially with the first member. A second member for transmitting a rotational force to another screw rod of the pair of screw rods, the first member and the second member;
And a shaft that couples a member and transmits a rotational force from the first member to the second member, wherein the shaft is the first member.
It is configured to be detachable along a detachment path formed in the member and the second member. The shaft is attached and detached along an attachment / detachment path formed in the first member and the second member. An embodiment of a material testing machine according to the present invention will be described below, focusing on differences from the prior art. 1 and 2
Transmits the driving force of the timing belt 7 to the left and right screw rods 4a,
4b shows a transmission device T for transmitting to FIG. 4b (FIG. 3). A left shaft 19 is connected to the left side of the timing pulley 14 meshing with the timing belt 7 via a friction joint 15. The left end of the left shaft 19 is connected to the worm speed reducer 9a shown in FIG. The friction joint 15 is for fixing the timing pulley 14 and the left shaft 19 at an arbitrary angle with respect to the rotation direction. By adjusting the connection angle between the timing pulley 14 and the left shaft 19a, the left and right screw rods 4a and 4b can be completely synchronized, and the crosshead 5 can be supported in a horizontal state. The friction joint 15 includes an outer member 16 and an inner member 17.
These members are inserted between a mounting hole 20 formed in the timing pulley 14 and the left shaft 19. By displacing the outer member 16 and the inner member 17 relatively in the axial direction with the screw 18, the timing pulley 14 and the left shaft 19a are fixed by a wedge action. At the left end of the shaft 22, a disk-shaped flange 23 having two mounting holes 25 and two mounting holes 28 is provided. A rectangular leaf spring 21 is attached to an end face of the flange
And two bolts 26 and nuts 27 through two mounting holes 24 formed in the leaf spring 21. Further, the shaft 22 is attached to the timing pulley 14 by bolts 30 via two attachment holes 29 formed in the attachment hole 28 and the leaf spring 21, and between the leaf spring 21 and the flange 23, and between the timing pulley 14 and the plate Spacers 31 are interposed between the springs 21, respectively. The leaf spring 21 is for absorbing misalignment between the left shaft 19a and a right shaft 19b described later. A linear groove 14A is formed on the shaft mounting surface of the timing pulley 14, and the head of the bolt 26 is housed in the groove 14A as shown in FIG. The right end of the shaft 22 is provided with a flange 123 similar to the left end flange 23, and a leaf spring 121 is attached to an end surface of the flange 123 with a bolt 131 and a nut 127 via a spacer 131. I have. Further, the shaft 22 is attached to the hub 32 by bolts 130 via a flange 123. The hub 32 is attached to the right shaft 119 via a friction joint 115 configured in the same manner as described above. The right end of the right shaft 119 is connected to the worm-type speed reducer 9b shown in FIG. A linear groove 32A similar to the groove 14A is formed on the shaft mounting surface 32a of the hub 32, and the head of a screw 126 for fastening the leaf spring 121 to the shaft 22 is housed in the groove 32A. As is clear from FIG. 2, the groove 14A and the groove 32A face each other and extend in the same direction. As described above, the groove 14A and the groove 32A extend in the same direction at positions facing each other, and the heads of the bolts 26 and 126 are housed in the grooves 14A and 32A. Therefore, bolt 30 and bolt 13
After extracting 0, the shaft 22 can be pulled out at right angles to the rotation axis with the heads of the bolts 26 and 126 along the grooves 14A and 32A.
After replacing the timing belt 7, the shaft 22 is
After insertion in the direction opposite to the direction in which the shaft 22 is pulled out along the groove 4A and the groove 32A, the shaft 22 can be returned to the state shown in FIG. 2 by fastening the bolt 30 and the bolt 130. In this way, since only the shaft 22 can be removed, the belt 7 can be easily replaced, and the state before the belt replacement can be restored. Conventionally, a circular recess for accommodating the heads of the bolts 26 and 126 described above is provided in the timing pulley 14 and the connecting member 32, and the timing pulley 14 and the hub 32 are provided with grooves as in the present embodiment. The timing pulley 14 was not formed.
And the left shaft 19 had to be separated. For this reason, when the belt 7 is assembled after replacement, the friction joint 15
Therefore, the mounting angle of the two must be readjusted to keep the crosshead horizontal, and a complicated operation is required. In this embodiment, the case where the linear grooves 14A and 32A are formed to make the shaft 22 detachable has been described. However, the shape is not limited as long as the shaft 2 can be detached. For example, instead of forming the linear groove in the timing pulley 14 as in the present embodiment, a portion other than the contact portion with the spacer 31 may be dropped over a wider range. Further, the present invention is not limited to the case where the shaft 22 can be removed by moving the shaft 22 in parallel, and the shaft 22 may be detachable by applying a rotational movement to the shaft 22 in an arbitrary direction. Further, the present invention is not limited to the case where the shaft 22 can be completely separated, and it is sufficient that a gap through which the timing belt 7 passes is secured. The timing pulley 14 of the present embodiment, the left shaft 1
9 and the worm-type speed reducer 9a correspond to the first member of claim 1; the left shaft 119, the hub 32 and the worm-type speed reducer 9b.
Constitutes the second member of claim 1. Further, the groove 14A and the groove 32A constitute a desorption path of the first aspect. As described above, according to the present invention,
Without disassembling the first member or the second member respectively connected to the screw rod of the transmission device, the shaft for connecting the two members is detached by the detachment path provided in these two members to exchange the belt. Since the adjustment is performed, it is not necessary to re-adjust the transmission device such as the horizontal adjustment of the crosshead when the belt is replaced, and the workability is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a part of a transmission device of an embodiment of a material testing machine according to the present invention. FIG. 2 is a cross-sectional view showing a part of a transmission device of the material testing machine according to the embodiment. FIG. 3 is a front view showing a conventional example of a material testing machine. [Description of Signs] 4a Screw rod 4b Screw rod 6 Motor 7 Belt 9a Worm type speed reducer 9b Worm type speed reducer 14 Timing pulley 14A Groove (removal path) 19 Left shaft 22 Shaft 32 Hub 32A Groove (removal path) 119 Right shaft

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Claims (1)

(57) Claims: 1. A motor, a belt for transmitting rotation of the motor, and a pair of screw rods which receive force from the belt and transmit force to a pair of screw rods. A transmission device that rotates the first member that rotates by engaging with the belt and transmits a rotational force to one of the pair of screw rods; A second member coaxially rotatable with the first member and transmitting a rotational force to another screw rod of the pair of screw rods; and connecting the first member and the second member to the first member.
A shaft for transmitting rotational force from a member to the second member, wherein the shaft is detachable along a detachment path formed in the first member and the second member. testing machine.