CN105058262B - A kind of simply supported on four sides square plate clamp for vibration testing - Google Patents

Abstract

The invention proposes a fixture for vibration testing of a simply supported square plate with four sides. The fixture includes a base, an adjustable locking member and a bead. For the support channel steel, the front and rear support channel steels are provided with horizontal ribs equidistant from the front and rear support channel steels. Two sets of adjustable locking strips of equal length are set parallel to the upper surface of the right support channel steel. There are grooves of equal height on the inner side of the adjustable locking strips. There are beading bars in the grooves. After derusting treatment on the side of the channel steel of the base Anti-corrosion paint is applied, and the surface of the adjustable locking strip is sandblasted. The fixture has high rigidity and strong clamping force, and can transmit the motion of the vibrating table to the square plate without distortion during the vibration test.

Description

A fixture for vibration testing of simply supported square plate with four sides

technical field

The invention relates to a fixture, in particular to a fixture for vibration testing of a simply supported square plate with four sides.

Background technique

The simply supported four sides are the degree of freedom uz out of the plane constrained by each side and the in-plane degree of freedom of rotation around the vertically modified side. In order to prevent rigid body displacement during calculation, ux and uy constraints are generally imposed on one side.

At present, the fixtures used for vibration testing of simply supported square plates on four sides mainly have the following problems. The fixture structure or design parameters are unreasonable, such as small structural rigidity, causing fixture resonance during the vibration test; small clamping force, square shape during the vibration test The connection between the plate and the fixture is easy to loosen, which cannot effectively realize the simply supported constraints on the four sides of the square plate.

Contents of the invention

In order to overcome the above-mentioned defects of the prior art, the present invention provides a fixture for vibration testing of a simply supported square plate with four sides. plate.

For realizing above-mentioned purpose of the invention, the technical scheme that the present invention takes is:

A fixture for vibration testing of four-sided simply supported square plates. The fixture includes a base, an adjustable locking piece and a bead. 1. There are transverse ribs equidistant between the rear support channels and the front and rear support channels. Two longitudinal ribs are arranged vertically and equidistantly on the transverse ribs. The front and rear support channels and the left and right support channels Two sets of adjustable locking strips of equal length are arranged in parallel on the surface. There are grooves of equal height inside the adjustable locking strips. There are beading strips in the grooves. The side of the channel steel of the base is derusted and coated with anti-corrosion paint. The surface of the adjustable locking bar is sandblasted.

Further, the openings of the front and rear supporting channel steels, the left and right supporting channel steels, the transverse ribs and the longitudinal ribs face downward, and the channel steels are connected by welding.

Further, the intersecting longitudinal ribs and transverse ribs form six small square frames with front and rear support channels and left and right support channels. Four bottom plates are welded on the sides of the longitudinal ribs. Four pieces of angle steel corresponding to the bottom plate are welded, and the angle steel and the bottom plate are correspondingly provided with screw holes, and the angle steel and the bottom plate are fixedly connected to the table top of the vibrating table by screws.

Further, the channel steel of the base is welded with a stiffened plate. The stiffened plate is obtained by cutting off two small isosceles right triangles at two acute angles from an isosceles right triangle. The rib plate is provided with a quarter circular hole with the intersection point of the right-angled sides of the large isosceles triangle as the center.

Further, the adjustable locking bar and the channel steel of the base are connected by bolts, and silica gel is provided between the adjustable locking bar and the channel steel of the base.

Further, the longitudinal section of the adjustable locking bar is U-shaped with lateral openings, and the upper surface of the adjustable locking bar is uniformly provided with adjustable screws running through the upper surface from top to bottom. Adjustable screw to inside through side.

Further, there is a dovetail groove facing the reinforcing rib of the base on the inner side of the bead, and the angle of the dovetail groove is 60°-90°.

Further, the angle of the dovetail groove is 90°.

Further, the stiffened plate is made of steel.

Further, after the bottom frame is welded, the upper surface in contact with the adjustable locking bar is cut to ensure the flatness of the upper surface.

Adjustable locking bars and battens are made of aluminum.

Adjust the screw of the locking bar to adjust the position of the pressing bar, so as to facilitate the installation and adjustment of the rectangular plate.

The four sides of the square plate to be tested are restrained on the corresponding bead.

The four sides of the tested rectangular plate are restrained on the corresponding bead respectively. The adjustable locking part fixes the bead with screws. The rectangular plate constrained between the bead is equivalent to simply supported on four sides, and the translational degrees of freedom of its four sides are completely constrained, but limited rotation is possible.

During the vibration test, the fixture is fixed on the vibrating table by screws. Then install the square plate between the bead, and adjust the position of the bead by adjusting the screw on the adjustable locking member until the gap between the rectangular plate and the dovetail groove is adjusted to an appropriate size.

During the test, the motion of the vibrating table is transmitted to the four-sided simply supported rectangular plate without distortion.

Compared with prior art, the beneficial effect of the present invention is:

1. A fixture for vibration testing of a simply supported square plate with four sides of the present invention has good dynamic characteristics, high stiffness and mass ratio, and high resonance frequency.

2. A fixture for vibration testing of a square plate with four sides simply supported by the present invention has a large clamping force and can meet the four-sided simply supported constraint conditions of the square plate.

3. A fixture for vibration testing of a simply supported square plate with four sides of the present invention has a compact structure, easy installation and simple manufacturing process.

4. A fixture for vibration testing of a four-sided simply supported square plate of the present invention, which transmits the motion of the vibration table to the square plate without distortion during the vibration test.

5. A fixture for vibration testing of a simply supported square plate with four sides of the present invention, the reinforcing rib provided on the base is provided with round holes, and the round holes can control the amount of deformation during welding.

6. A fixture for vibration testing of a four-sided simply supported square plate of the present invention, the part where the adjustable locking member is in contact with the bottom frame needs to be coated with silica gel to make the connection between the two more firm and further enhance the rigidity of the structure.

7. A fixture for vibration testing of a four-sided simply supported square plate of the present invention, the bead can effectively ensure the simply supported constraints on the four sides of the square plate, and the size of the gap between the square plate and the bead can be adjusted.

Description of drawings

Fig. 1 is a three-dimensional view of the fixture;

Figure 2 is a top view of the fixture;

Fig. 3 is a sectional view of the adjustable locking bar;

1-base; 2-layer 2; 3-adjustable locking bar; 4-reinforced plate; 5-bottom plate; 6-angle steel.

detailed description

Below in conjunction with example the present invention is described in detail.

Example 1:

As shown in Figure 1, a fixture for vibration testing of a four-sided simply supported square plate, the fixture includes a base 1, an adjustable locking member and a bead 2, the base 1 includes oppositely arranged front and rear support channel steels that are fixedly connected to form a square frame and the left and right support channel steels, the front and rear support channel steels are provided with horizontal ribs equidistant from the front and rear support channel steels, and two longitudinal ribs are arranged vertically and equidistantly on the transverse ribs, and the front and rear support channel steels Two sets of adjustable locking strips 3 of equal length are arranged in parallel on the upper surfaces of the steel and the left and right support channel steel, and grooves of equal height are arranged on the inner side of the adjustable locking strips 3, and a bead 2 is arranged in the groove, and a base 1 The side of the channel steel is treated with rust removal and anti-corrosion paint is applied, and the surface of the adjustable locking bar 3 is sandblasted.

The openings of the front and rear support channels, the left and right support channels, the transverse ribs and the longitudinal ribs face downward, and the channel steels are connected by welding.

The intersecting longitudinal ribs and transverse ribs form six small square frames with front and rear support channel steels and left and right support channel steels. Four bottom plates 5 are welded on the sides of the longitudinal ribs. There are four angle steels 6 arranged correspondingly to the bottom plate 5, and the angle steels 6 and the bottom plate 5 are provided with screw holes correspondingly, and the angle steels 6 and the bottom plate 5 are fixedly connected to the table top of the vibrating table by screws.

The channel steel of the base 1 is welded with a stiffened plate 4, the stiffened plate 4 is obtained by cutting off two small isosceles right triangles at two acute angles of an isosceles right triangle, and the right angle sides of the stiffened plate 4 are welded to the channel steel, The stiffened plate 4 is provided with a quarter circular hole whose center is the intersection point of the right-angled sides of the large isosceles triangle.

The adjustable locking bar 3 and the channel steel of the base 1 are connected by bolts, and silica gel is arranged between the adjustable locking bar 3 and the channel steel of the base 1 .

The longitudinal section of the adjustable locking bar 3 is U-shaped with lateral openings, the upper surface of the adjustable locking bar 3 is uniformly provided with adjustable screws running through the upper surface from top to bottom, and the side of the adjustable locking bar 3 is provided with Adjustable screw to inside through side.

The inner side of the bead 2 is provided with a dovetail groove facing the reinforcing rib of the base 1, and the angle of the dovetail groove is 90°.

The stiffened plate 4 is made of steel.

After the bottom frame is welded, the upper surface in contact with the adjustable locking bar 3 is cut to ensure the flatness of the upper surface.

The adjustable locking bar 3 and the pressing bar 2 are made of aluminum.

Adjust the screw of the locking bar to adjust the position of the pressing bar 2, thereby facilitating the installation and adjustment of the rectangular plate.

The four sides of the tested square plate are constrained on the corresponding bead 2 respectively.

The four sides of the tested rectangular plate are restrained on the corresponding bead 2 respectively. And the adjustable locking part fixes the bead 2 by screws. The rectangular plate constrained between the bead 2 is equivalent to simply supported on four sides, and the translational degrees of freedom of its four sides are completely constrained, but limited rotation is possible.

During the vibration test, the fixture is fixed on the vibrating table by screws. Then install the square plate between the bead 2, and adjust the position of the bead 2 by adjusting the screw on the adjustable locking member until the gap between the rectangular plate and the dovetail groove is adjusted to an appropriate size.

During the test, the motion of the vibrating table is transmitted to the four-sided simply supported rectangular plate without distortion.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims (7)

1. A fixture for vibration testing of a simply supported square plate with four sides, characterized in that: the fixture includes a base, an adjustable locking member and a bead, and the base includes oppositely arranged front and rear support grooves affixed to a square frame steel and left and right support channel steel, the front and rear support channel steels are provided with transverse ribs equidistant from the front and rear support channel steels, and two longitudinal ribs are vertically and equidistantly arranged on the transverse ribs, and the Two groups of equal-length adjustable locking strips are respectively arranged in parallel on the upper surfaces of the front and rear support channel steels and the left and right support channel steels. There is a bead in the groove, the side of the channel steel of the base is derusted and coated with anti-corrosion paint, and the surface of the adjustable locking bar is sandblasted. 2. A clamp for vibration testing of a simply supported square plate with four sides as claimed in claim 1, characterized in that: the openings of the front and rear support channels, left and right support channels, transverse ribs and longitudinal ribs face downward, and the openings of the channel steel connected by welding. 3. A fixture for vibration testing of a simply supported square plate with four sides as claimed in claim 1, wherein said longitudinal ribs, transverse ribs, front and rear support channels, and left and right support channels form two rows of three square frames each. , four bottom plates are welded on the side of the longitudinal rib, and the bottom plate is arranged in four small square frames on the outside. , the angle steel and the bottom plate are fixed to the vibrating table surface by screws. 4. A fixture for vibration testing of a four-sided simply supported square plate as claimed in claim 1, wherein a stiffened plate is welded at the intersection of the channel steels of the base, and the stiffened plate is composed of an isosceles right triangle It is made by cutting out small isosceles right-angled triangles at two acute angles. The right-angled side of the stiffened plate is welded to the channel steel. The stiffened plate has a quarter-round hole centered on the intersection point of the right-angled sides of the large isosceles right-angled triangle. . 5. A fixture for vibration testing of a simply supported square plate with four sides as claimed in claim 1, characterized in that: the adjustable locking strip is connected to the channel steel of the base by bolts, and the adjustable locking Silica gel is provided between the bar and the channel steel of the base. 6. A fixture for vibration testing of a simply supported square plate with four sides as claimed in claim 1, characterized in that: the longitudinal section of the adjustable locking bar is U-shaped with side openings, and the adjustable locking bar is The surface is uniformly provided with adjustable screws penetrating the upper surface from top to bottom, and the side of the adjustable locking bar is uniformly provided with adjustable screws penetrating the side surface from outside to inside. 7. A fixture for vibration testing of a simply supported square plate with four sides as claimed in claim 1, characterized in that: the inner side of the bead is provided with a dovetail groove facing the reinforcing rib of the base, and the angle of the dovetail groove is 60°-90° °.