JP3509369B2 - Material testing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box-shaped support provided on both sides and a rotatable screw rod, and a crosshead between the support. And the both ends of the crosshead are engaged with the respective screw rods via nuts, and the crosshead is displaced by the rotation of the two screw rods, and the chuck attached to the crosshead The present invention relates to a material testing machine for applying a tensile load or the like to a test piece gripped through a test piece and testing the tensile strength or the like of the test piece. 2. Description of the Related Art FIG. 5 shows a material test, particularly a static material test in which a tensile load or a compressive load is applied to a test piece. FIG. 5 is a cross-sectional view showing only the right pillar M portion. In this material testing machine, a screw rod S is rotatably installed in both box-shaped (U-shaped cross-section) columns M, M vertically suspended on both sides, and a cross-section is provided between both columns M, M. A head K is installed, and both ends of the cross head K are engaged with the respective screw rods S via nuts N. Then, the crosshead K is vertically displaced by the rotational driving of the two screw rods S, and the crosshead K
The tensile strength and the like of the test piece TP are tested by applying a tensile load or the like to the test piece TP gripped via the chuck C attached to the base and the chuck Y on the machine base D side.
LS is a load cell for detecting a load value. [0003] In this type of material testing machine, it is not preferable if dust or dust enters the screw rods, and it is dangerous if the hands of the test operator get tangled with these screw parts. The struts M, M should be formed in a complete box shape. However, since a crosshead K is erected between both struts M, M, and both ends of the crosshead K need to be engaged with each screw rod S. , Both supporting surfaces M, the corresponding surface of each other (inner surface)
The side is open, and both columns M, M have a U-shaped cross section. And this opening is the bellows (bellows) as a protection wall as shown in the figure for the invasion of dust and dirt and safety measures.
Z and Z are stretched. By extending the bellows Z, the vertical displacement of the crosshead K is ensured, and dust and dirt can enter and safety measures can be taken. [0004] The bellows Z in the conventional material testing machine function to prevent dust and dirt from entering and to take safety measures. Problems. That is, the bellows Z, Z are made of paper or a rubber plate so as to be freely foldable, have low strength, and may be used when a hand or a tool for a test operation suddenly enters or is inserted. It is dangerous that hands and tools come into contact with the threaded rod. Furthermore, when the crosshead K moves up and down in the test, the bellows Z may extend and buckle. When this buckling is repeatedly performed, the bellows Z, Z are cracked and broken from the fold at that position. Further, the bellows Z, Z expand and contract when moving up and down the crosshead K, but have a constant thickness and restrict the amount of movement (stroke) of the crosshead K in relation to its folded thickness, which is effective. There is a problem that the stroke is shortened. [0006] The present invention provides a material testing machine which solves such problems. [0007] The material testing machine provided by the present invention is the above-mentioned static material testing machine, wherein a space is formed on both sides of the crosshead and near the inside of the screw rod. At the same time, plate-shaped covers penetrating the respective space portions are fixedly installed along the screw rods, and the respective screw rods are surrounded by the respective plate-shaped covers in the box-shaped column. FIG. 1 is a view showing the configuration of a material testing machine provided by the present invention in a form similar to that of FIG. 5, and is a box-shaped (U-shaped section) suspended vertically on both sides. A screw rod 2 is rotatably installed in each of the columns 1 and 1, and a crosshead 3 is provided between the columns 1 and 1, and both ends of the crosshead 3 are connected to each other via nuts 4. The cross head 3 is vertically displaced by the rotational driving of the two screw rods 2, and is gripped via the chuck 5 attached to the cross head 3 and the chuck 5 on the machine base 6 side. The tensile strength and the like of the test piece 7 are tested by applying a tensile load and the like to the test piece 7 thus obtained.
Reference numeral 8 denotes a load cell for detecting a load value. The crosshead 3 is formed in a box shape as in the prior art, but has a through hole 3H in the center, and the upper end of the upper chuck 5 is connected to the load cell 8 through the through hole 3H. The load on the test piece 7 is detected. 9
York. Although the above configuration is not different from the conventional one, in the present invention, slits 3S are formed on both sides of the crosshead 3 and near the inside of the screw rod 2 as shown in the figure, and each slit 3S (left (Not shown) are fixedly installed on the columns 1, 1 along the screw rod 2, respectively. Here, the vicinity of the inside refers to a position inside the two screw rods 2 and close to the screw rods 2, but is preferably a position for sealing the open side of the column 1 having a U-shaped cross section. If the distance is too close to the threaded rod 2, the distance between the slit 3S and the nut 4 becomes small and the mechanical strength decreases, which is a problem. The distance is set in consideration of these circumstances. Each screw rod 2 is formed by the plate-shaped cover 10.
Is configured to be enclosed in the box-shaped supports 1, 1. This enclosure is not a complete enclosure with a seal, but rather a plate-like cover 10.
A gap is created between the support rods 1 and 1, but generally encloses the screw rod 2. The shape of the slit 3S in the crosshead 3 is formed so as to extend in a direction perpendicular to the longitudinal direction of the crosshead 3, as shown in FIG. A plate-like cover 10 formed to be insertable into the slit 3S penetrates. The two have a certain interval so that they do not touch each other, so that they do not come into contact with each other even if the crosshead 3 is displaced in the front-rear direction during the test. The installation of the plate-shaped cover 10 allows the crosshead 3 to be moved up and down, of course, but functions to prevent intrusion of dust and dirt and safety measures. In addition, a hand or a tool for a test operation suddenly enters. It does not occur to be inserted or inserted, and the problem of buckling like a conventional bellows is solved. Then, the crosshead 3 can be moved up and down between the machine base 6 and the yoke 9, and the effective stroke can be increased as compared with the related art. In the case of the method in which the slit 3S is formed, the cross head 3 remains in a box shape, has high mechanical strength, and has advantages such as improving the appearance. FIG. 3 shows a modified embodiment of the present invention, which differs from FIGS. 1 and 2 in that the shape of the crosshead 3 is different. That is, the crosshead 3 shown in FIG. 3 is not formed in a box shape as shown in FIGS. 1 and 2, but is constituted by crosshead frames 3P, 3P arranged on both sides in the front-rear direction in FIG. It is an example that is formed. The plate-like cover 11 penetrates this space. Of course, the load cell 8 is provided between the two crosshead frames 3P, 3P so as to detect the load. FIG. 4 shows FIG.
FIG. 4 is a perspective view showing the configuration of FIG. 3 similarly to FIG. The method of penetrating the plate-like cover 11 between the crosshead frames 3P, 3P is useful for reducing the weight of the crosshead, and is easier to process and assemble than the slit method, and the side of the crosshead 3 during the test. There is also an advantage that the cross head 3 and the plate-shaped cover 11 do not come into contact with each other even if some directional vibration occurs. Although the features of the material testing machine provided by the present invention are as described above, various modified embodiments utilizing this feature are included in addition to the above and illustrated examples. For example, in the illustrated example, the column is vertically suspended and the crosshead 3 moves up and down. However, the present invention is also applicable to a testing machine in which the column is installed horizontally. The present invention is applicable not only to a tensile tester but also to a compression tester. The configuration of the test machine can also be applied to a configuration in which a column is suspended on the machine base. The plate-like cover is preferably made of a metal material or a synthetic resin material in terms of strength, but paper products and rubber materials can also be used. It is also possible to make the resin material transparent so that the inside can be observed. The invention embraces all these alternative embodiments. The present invention is summarized as follows. Supplementary Note 1 A screw rod is rotatably installed in each of two box-shaped supports provided on both sides, a crosshead is provided between the two supports, and both ends of the crosshead are connected via nuts. The screw head is configured to be engaged with the respective screw rods, the crosshead is displaced by the rotation drive of the both screw rods, and a tensile load or the like is applied to the test piece gripped via the chuck attached to the crosshead. In the tester, a space portion is formed on both sides of the crosshead and near the inside of the screw rod, and plate-like covers penetrating the respective space portions are respectively set along the screw rod. A material testing machine characterized in that each screw rod is surrounded by a box-shaped support in a box-shaped support. Supplementary Note 2 A threaded rod is rotatably installed in each of two box-shaped posts suspended from both sides, a crosshead is erected between the two posts, and both ends of the crosshead are connected via nuts. The cross head is moved up and down by the rotation of the two screw rods, and a tensile load or the like is applied to the test piece gripped via the chuck attached to the cross head. In the test machine, a space is formed on both sides of the crosshead and near the inside of the screw rod, and plate-like covers penetrating the respective spaces are respectively set along the screw rod, and A material testing machine characterized in that each screw rod is surrounded by a plate-shaped cover in a box-shaped support. Supplementary Note 3 A screw rod is rotatably installed in each of two box-shaped supports provided on both sides, a crosshead is provided between the two supports, and both ends of the crosshead are connected via nuts. The screw head is configured to be engaged with the respective screw rods, the crosshead is displaced by the rotation drive of the both screw rods, and a tensile load or the like is applied to the test piece gripped via the chuck attached to the crosshead. In the tester, slits are formed on both sides of the crosshead and near the inside of the screw rod, and plate-like covers penetrating the respective slits are respectively installed along the screw rods, and the respective plate-like covers are provided. A material testing machine characterized in that each of the screw rods is surrounded by a box-shaped support by means of: Supplementary Note 4 A screw rod is rotatably installed in each of two box-shaped supports provided on both sides, a crosshead is provided between the two supports, and both ends of the crosshead are connected via nuts. The screw head is configured to be engaged with the respective screw rods, the crosshead is displaced by the rotation drive of the both screw rods, and a tensile load or the like is applied to the test piece gripped via the chuck attached to the crosshead. In the test machine, a space is formed on both sides of the crosshead and inside the screw rod, and plate-shaped covers penetrating the respective spaces are respectively set along the screw rod, and the plate-shaped covers are used. A material testing machine wherein each screw rod is surrounded by a box-shaped support. As described above, the material testing machine provided by the present invention eliminates the bellows problem of the conventional material testing machine. That is,
The cover has sufficient strength as a cover for protecting the screw rod, and does not deform when a hand or a tool for a test operation suddenly enters or is inserted. Therefore, there is no danger of the hand or tool coming into contact with the threaded rod. Also, there is no problem of buckling as in the conventional bellows. Furthermore, since the bellows and the like do not intervene in the vertical movement of the crosshead to the upper or lower part, the crosshead can be raised and lowered between the machine base and the yoke, and the effective stroke can be made larger than in the past.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a configuration of a material testing machine according to the present invention. FIG. 2 is a perspective view showing a configuration of a material testing machine according to the present invention. FIG. 3 is a diagram showing a configuration of a material testing machine according to the present invention. FIG. 4 is a perspective view showing a configuration of a material testing machine according to the present invention. FIG. 5 is a diagram showing a configuration of a conventional material testing machine according to the present invention. [Description of Signs] 1 ... Support 2 ... Screw rod 3 ... Cross head 3S ... Slit 4 ... Nut 5 ... Chuck 6 ... Machine 7 ... Test piece 8 ... Load cell 9 ... Yoke 10, 11 ... Plate cover

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01N 3/08 G01N 3/02

Claims (1)

(57) [Claims] [Claim 1] A screw rod is rotatably installed in both box-shaped pillars installed on both sides, and a crosshead is erected between the pillars and A test in which both ends of the head are engaged with the respective threaded rods via nuts, the crosshead is displaced by rotation of the two threaded rods, and gripped via a chuck attached to the crosshead. In a testing machine designed to apply a tensile load or the like to a piece, a plate-shaped cover is formed on both sides of the crosshead and near the inside of the screw rod, and a plate-shaped cover penetrating each space is attached to the screw rod. A material testing machine, wherein each of the screw rods is disposed within a box-shaped support by the respective plate-shaped covers.