1. The utility model provides a four sides simply support restraint rectangular plate mechanical testing clamping device which characterized in that: the clamping device comprises a straight-edge bracket, an incomplete cylinder I, an incomplete cylinder II, a corner bracket, a right-angle incomplete cylinder I, a right-angle incomplete cylinder II, a compression bolt and an adjusting nut;

the straight-edge bracket is a non-closed cuboid frame consisting of an upper bottom surface, a lower bottom surface and a side surface;

the incomplete cylinder I and the incomplete cylinder II are both incomplete cylinders which are non-closed circles in the radial direction, two end faces are non-closed circular faces, the side face is composed of an arc face and a plane, and threaded blind holes are machined in the plane of the incomplete cylinder I;

the corner bracket is a non-closed square frame consisting of an upper bottom surface, a lower bottom surface and two side surfaces, wherein the two side surfaces are vertical to each other;

the right-angle incomplete cylinder I and the right-angle incomplete cylinder II are formed by bending and folding an incomplete cylinder which is a non-closed circle in the radial direction in 90 degrees, two end faces are non-closed circular faces, the side face is composed of an arc face and a plane, and a threaded blind hole is machined in the plane of the right-angle incomplete cylinder I;

each compression bolt is provided with an adjusting nut; the pressing bolt penetrates through the upper bottom surface of the straight-side support to be in threaded connection with the plane of the incomplete cylinder I, an adjusting nut on the pressing bolt is located outside the straight-side support, the plane of the incomplete cylinder II is fixedly connected with the lower bottom surface of the straight-side support, and the axial center lines of the incomplete cylinder I and the incomplete cylinder II located inside the straight-side support are aligned up and down; the compression bolt penetrates through the upper bottom surface of the corner support to be in threaded connection with the plane of the right-angle type incomplete cylinder I, an adjusting nut on the compression bolt is located outside the corner support, the plane of the right-angle type incomplete cylinder II is fixedly connected with the lower bottom surface of the corner support, and the axial center lines of the right-angle type incomplete cylinder I and the right-angle type incomplete cylinder II which are located inside the corner support are vertically aligned; and (4+2N) straight-side brackets and four corner brackets are connected together to form a closed hollow cuboid, wherein the lengths of the (4+2N) straight-side brackets are equal or unequal, and N is a natural number.

2. The clamping device for the mechanical test of the four-side simply supported and constrained rectangular plate according to claim 1, is characterized in that: the number of the compression bolts in the clamping device is (8+2M), and M is a natural number.

3. The clamping device for the mechanical test of the four-side simply supported and constrained rectangular plate according to claim 1, is characterized in that: when N is 0, convex flat keys are respectively processed at two ends of the right-angle incomplete cylinder I, and grooves are respectively processed at two ends of the incomplete cylinder I; or grooves are respectively processed at two ends of the right-angle incomplete cylinder I, and convex flat keys are respectively processed at two ends of the incomplete cylinder I; when the straight-edge bracket and the corner bracket are assembled together, the flat key of one bracket is in clearance fit with the groove of the other bracket.

4. The clamping device for the mechanical test of the four-side simply supported and constrained rectangular plate according to claim 1, is characterized in that: when N is equal to 0 or N is not equal to 0, a protruding flat key is machined at one end of the right-angle type incomplete cylinder I, and a groove is machined at the other end of the right-angle type incomplete cylinder I; one end of the incomplete cylinder I is provided with a convex flat key, and the other end of the incomplete cylinder I is provided with a groove; when the straight-side brackets and the corner brackets or the straight-side brackets and the straight-side brackets are assembled together, the flat key of one bracket is in clearance fit with the groove of the other bracket.

5. The clamping device for the mechanical test of the four-side simply supported and constrained rectangular plate according to claim 1, is characterized in that: the side surface of the straight-side bracket is provided with a threaded counter bore, the side surface of the corner bracket is provided with a threaded counter bore, and the straight-side bracket and the corner bracket as well as the straight-side bracket and the straight-side bracket are connected through connecting bolts.

6. The clamping device for the mechanical test of the four-side simply supported and constrained rectangular plate according to claim 1, is characterized in that: the clamping device further comprises an L-shaped connecting piece, one plane of the L-shaped connecting piece is fixedly connected with the side face of the straight-edge support, and the other plane of the L-shaped connecting piece is fixedly connected with the test bed.

7. The clamping device for the mechanical test of the four-side simply supported and constrained rectangular plate according to claim 1, is characterized in that: the clamping device further comprises an L-shaped connecting piece and a bottom flat plate, one plane of the L-shaped connecting piece is fixedly connected with the side face of the straight-edge support, the other plane of the L-shaped connecting piece is fixedly connected with the bottom flat plate, and the bottom flat plate is connected with the experiment table.

8. The clamping device for the mechanical test of the four-side simply supported and restrained rectangular plate as claimed in claim 6 or 7, wherein: the number of the L-shaped connecting pieces is (4+2X), and X is a natural number.

9. The clamping device for the mechanical test of the four-side simply supported and constrained rectangular plate according to any one of claims 1 to 7, wherein: the clamping device is made of aluminum alloy or titanium alloy.

Background

The four-side simply-supported rectangular plate boundary is used for restraining the degree of freedom outside the plane of each side and the degree of freedom of rotation in the plane around the vertical side, namely the deflection w on the four sides of the rectangular plate is 0, the bending moment M is 0, and the expression is as follows:

(w)_x＝0＝(M_x)_x＝0＝0，(w)_x＝a＝(M_x)_x＝a＝0

(w)_y＝0＝(M_y)_y＝0＝0，(w)_y＝b＝(M_y)_y＝b＝0 (1)

wherein the content of the first and second substances,x and y are coordinates of any point in the middle plane of the rectangular plate; x is 0, y is 0, and y is b representing the four sides of the rectangular plate boundary.

The clamping device for restraining the boundary, which is applied at present, is provided with four-edge fixed support, four-point simple support, single-edge fixed support or opposite-edge fixed support and the like, but the clamping device for restraining the four-edge simple boundary is few, and the existing clamping device for testing the vibration of the rectangular plate also has the following problems: the clamp structure design of the four-point simple support boundary is unstable, and a test piece is easy to separate from the clamp in the vibration test process; the constraint condition is not enough, and the boundary requirement of the formula (1) cannot be met; the rigidity of the single-side/opposite-side fixed support structure is small, and the clamp resonates in the vibration test process. In addition, the existing four-side simply-supported clamping device is complex in structure and troublesome to assemble and disassemble, only can clamp a sample plate with a single geometric size, and various clamping devices with corresponding sizes need to be processed aiming at sample plates with different sizes, so that the time and labor are wasted, and the cost is high.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a four-side simply-supported constraint rectangular plate mechanical test clamping device which can meet the boundary condition of four-side simply-supported constraint rectangular plates and can clamp rectangular plates with different sizes.

The purpose of the invention is realized by the following technical scheme.

A four-side simply-supported constrained rectangular plate mechanical testing clamping device comprises a straight-side bracket, an incomplete cylinder I, an incomplete cylinder II, a corner bracket, a right-angle incomplete cylinder I, a right-angle incomplete cylinder II, a compression bolt and an adjusting nut;

the straight-edge bracket is a non-closed cuboid frame consisting of an upper bottom surface, a lower bottom surface and a side surface, and the side surface is vertical to the upper bottom surface and the lower bottom surface respectively;

the incomplete cylinder I and the incomplete cylinder II are both incomplete cylinders which are non-closed circles in the radial direction, two end faces are non-closed circular faces, the side face is composed of an arc face and a plane, and threaded blind holes are machined in the plane of the incomplete cylinder I;

the corner bracket is a non-closed square frame consisting of an upper bottom surface, a lower bottom surface and two side surfaces, the two side surfaces are respectively vertical to the upper bottom surface and the lower bottom surface, and the two side surfaces are vertical to each other;

the right-angle incomplete cylinder I and the right-angle incomplete cylinder II are formed by bending and folding an incomplete cylinder which is a non-closed circle in the radial direction in 90 degrees, two end faces are non-closed circular faces, the side face is composed of an arc face and a plane, and a threaded blind hole is machined in the plane of the right-angle incomplete cylinder I;

each compression bolt is provided with an adjusting nut; the pressing bolt penetrates through the upper bottom surface of the straight-side support and is in threaded connection with the plane of the incomplete cylinder I, the adjusting nut on the pressing bolt is located outside the straight-side support, the plane of the incomplete cylinder II is fixedly connected with the lower bottom surface of the straight-side support, and the axial center lines of the incomplete cylinder I and the incomplete cylinder II located inside the straight-side support are aligned up and down (namely, the projections of the two axial center lines on the lower bottom surface of the straight-side support are overlapped); the compression bolt penetrates through the upper bottom surface of the corner support to be in threaded connection with the plane of the right-angle type incomplete cylinder I, an adjusting nut on the compression bolt is located outside the corner support, the plane of the right-angle type incomplete cylinder II is fixedly connected with the lower bottom surface of the corner support, and the axial center lines of the right-angle type incomplete cylinder I and the right-angle type incomplete cylinder II which are located inside the corner support are vertically aligned; and (4+2N) straight-side brackets and four corner brackets are connected together to form a closed hollow cuboid, wherein the lengths of the (4+2N) straight-side brackets (namely the size of the incomplete cylinder II in the axial direction) can be equal and can be unequal, and N is a natural number.

For the clamping device, rectangular plates are clamped between the incomplete cylinder I and the incomplete cylinder II and between the right-angle incomplete cylinder I and the right-angle incomplete cylinder II; the incomplete cylinder I and the right-angle incomplete cylinder I can move up and down by adjusting the adjusting nut, so that rectangular plates with different thicknesses can be clamped and are convenient to assemble and disassemble; by adjusting the numerical value of N and selecting the straight-edge brackets with different lengths, rectangular plates with different lengths and widths can be clamped; when the clamping device is used for clamping the rectangular plate to perform mechanical property test, the clamping device needs to be fixedly installed on a test bed.

Further, the number of the compression bolts in the clamping device is (8+2M), and M is a natural number. The number of the compression bolts can be adjusted according to the size and the number of the straight-edge brackets.

Furthermore, the clamping device also comprises an L-shaped connecting piece, one plane of the L-shaped connecting piece is fixedly connected with the side surface of the straight-edge bracket, and the other plane of the L-shaped connecting piece is fixedly connected with the test bed; the number of the L-shaped connecting pieces can be adjusted according to the size and the number of the straight-edge brackets, and is preferably (4+2X), wherein X is a natural number.

Furthermore, the clamping device also comprises an L-shaped connecting piece and a bottom flat plate, one plane of the L-shaped connecting piece is fixedly connected with the side surface of the straight-edge support, the other plane of the L-shaped connecting piece is fixedly connected with the bottom flat plate, and the bottom flat plate is connected with the experiment table, so that the size of the flat plate fixing hole is only required to be changed for different experiment table fixing sizes, and the size of the L-shaped connecting piece is not required to be changed; the number of the L-shaped connecting pieces can be adjusted according to the size and the number of the straight-edge brackets, and is preferably (4+2X), wherein X is a natural number.

Further, when N is 0, protruding flat keys are respectively machined at two ends of the right-angle incomplete cylinder I, and grooves are respectively machined at two ends of the incomplete cylinder I; or grooves are respectively processed at two ends of the right-angle incomplete cylinder I, and convex flat keys are respectively processed at two ends of the incomplete cylinder I; when the straight-side bracket and the corner bracket are assembled together, the flat key of one bracket is in clearance fit with the groove of the other bracket, and the flat key is matched with the groove, so that the straight-side bracket and the corner bracket can be quickly connected;

when N is equal to 0 or N is not equal to 0, a protruding flat key is machined at one end of the right-angle type incomplete cylinder I, and a groove is machined at the other end of the right-angle type incomplete cylinder I; one end of the incomplete cylinder I is provided with a convex flat key, and the other end of the incomplete cylinder I is provided with a groove; when the straight-side bracket and the corner bracket or the straight-side bracket and the straight-side bracket are assembled together, the flat key of one bracket is in clearance fit with the groove of the other bracket, and the straight-side bracket and the corner bracket and the straight-side bracket are in quick connection through the fit of the flat key and the groove.

Furthermore, threaded counter bores are machined in the side face of the straight-side support, threaded counter bores are machined in the side face of the corner support, and the straight-side support and the corner support are connected through connecting bolts and the straight-side support are connected through connecting bolts.

Furthermore, the material of the clamping device is preferably light high elastic modulus metal, such as aluminum alloy and titanium alloy, so that the influence of the rotational inertia of the clamping device on the test result can be reduced.

Has the advantages that:

in the clamping device, an incomplete cylinder I, an incomplete cylinder II, a right-angle incomplete cylinder I and a right-angle incomplete cylinder II form a constraint condition required by a four-side simply-supported boundary condition for clamping a rectangular plate; rectangular plates with different thicknesses can be clamped by adjusting the adjusting nuts on the compression bolts; through the quantity and the size of adjusting straight flange support, can realize carrying out the centre gripping to different length and width rectangular plate. The clamping device is simple in structure, convenient to assemble and disassemble the rectangular plate, high in universality, capable of clamping rectangular plates with different thicknesses, lengths and widths and good in application prospect.

Drawings

FIG. 1 is a schematic three-dimensional structure of the clamping device according to the embodiment.

FIG. 2 is a top view of the clamping device in the example.

FIG. 3 is a diagram showing the assembly relationship among the straight-side bracket, the incomplete cylinder I and the incomplete cylinder II.

FIG. 4 is an assembly relation diagram among corner support, right-angle type incomplete cylinder I and right-angle type incomplete cylinder II.

Fig. 5 is a diagram of the assembly relationship between the straight-edge bracket and the corner bracket.

The device comprises a support, a compression bolt, a regulating nut, a connecting piece, a corner support, an incomplete cylinder II, a incomplete cylinder I, a compression bolt, a regulating nut, a connecting piece and a corner support, wherein the support is 1-a straight edge support, the incomplete cylinder II, the incomplete cylinder I is 2-a right-angle cylinder I, the compression bolt is 4-a regulating nut, the connecting piece is 6-L-shaped, the corner support is 7-a right-angle incomplete cylinder II, and the right-angle incomplete cylinder I is 9-a right-angle incomplete cylinder I.

Detailed Description

The present invention is further illustrated by the following figures and detailed description, wherein the processes are conventional unless otherwise specified, and the starting materials are commercially available from a public source without further specification. In addition, in the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Example 1

Taking a rectangular plate with the size of 200mm × 200mm as an example, the four-side simply-supported constrained rectangular plate mechanical testing clamping device comprises a straight-edge support 1, an incomplete cylinder I3, an incomplete cylinder II 2, a corner support 7, a right-angle incomplete cylinder I9, a right-angle incomplete cylinder II 8, a compression bolt 4, an adjusting nut 5 and an L-shaped connecting piece 6, as shown in fig. 1 and 2;

the straight-edge bracket 1 is a non-closed cuboid frame consisting of an upper bottom surface, a lower bottom surface and a side surface, the upper end and the lower end of the side surface are respectively and vertically connected with the upper bottom surface and the lower bottom surface in a one-to-one correspondence manner, and the front end and the rear end of the side surface are respectively provided with two threaded counter bores, as shown in figure 3;

the incomplete cylinder I3 and the incomplete cylinder II 2 are both incomplete cylinders (such as incomplete cylinders obtained by cutting along the axial direction of the cylinders) which are non-closed circles in the radial direction, two end faces are non-closed circular faces, the side faces are composed of arc-shaped faces and flat faces, three threaded blind holes are uniformly machined in the plane of the incomplete cylinder I3 along the length direction (namely the axial direction), and grooves are respectively machined in the non-closed circular faces at the two ends of the incomplete cylinder I3, as shown in figure 3;

the corner bracket 7 is a non-closed square frame consisting of an upper bottom surface, a lower bottom surface and two side surfaces, the upper end and the lower end of each of the two side surfaces are respectively and correspondingly and vertically connected with the upper bottom surface and the lower bottom surface one by one, the rear ends of the two side surfaces are vertically connected, and two threaded counter bores are respectively processed at the front ends of the two side surfaces, as shown in fig. 4;

the right-angle type incomplete cylinder I9 and the right-angle type incomplete cylinder II 8 are both formed by bending and folding an incomplete cylinder (such as an incomplete cylinder obtained by cutting along the axial direction of the cylinder) with a non-closed circle in the radial direction at 90 degrees, two end faces are non-closed circular faces, the side face consists of an arc-shaped face and a plane, a threaded blind hole is processed on the plane of the right-angle type incomplete cylinder I9, and convex flat keys are respectively processed on the non-closed circular faces at the two ends of the right-angle type incomplete cylinder, as shown in figure 4;

the clamping device comprises sixteen compression bolts 4, and each compression bolt 4 is provided with an adjusting nut 5; the compression bolts 4 penetrate through the upper bottom surfaces of the straight-side supports 1 and are in threaded connection with the plane of the incomplete cylinder I3, the adjusting nuts 5 on the compression bolts 4 are located outside the straight-side supports 1, and three compression bolts 4 are mounted on the upper bottom surface of each straight-side support 1; the plane of the incomplete cylinder II 2 is welded on the lower bottom surface of the straight-side support 1, and the axial center lines of the incomplete cylinder I3 and the incomplete cylinder II 2 which are positioned in the straight-side support 1 are aligned up and down (namely, the projections of the two axial center lines on the lower bottom surface of the straight-side support 1 are overlapped); the compression bolts 4 penetrate through the upper bottom surfaces of the corner supports 7 and are in threaded connection with the plane of the right-angle incomplete cylinder I9, the adjusting nuts 5 on the compression bolts 4 are located outside the corner supports 7, and one compression bolt 4 is mounted on the upper bottom surface of each corner support 7; the plane of the right-angle incomplete cylinder II 8 is welded on the lower bottom surface of the corner support 7, and the axial center line (namely the axial L-shaped center line along the incomplete cylinder on the plane) of the right-angle incomplete cylinder I9 positioned in the corner support 7 and the axial center line of the right-angle incomplete cylinder II 8 are vertically aligned; connecting four straight-edge brackets 1 with the same length (namely the axial size of the incomplete cylinder I) and four corner brackets 7 together through connecting bolts to form a closed hollow cuboid, wherein a flat key of a right-angle incomplete cylinder I9 is in clearance fit with a groove of an incomplete cylinder I3, as shown in figure 5; an L-shaped connecting piece 6 is welded on the side of each straight-sided bracket 1, as shown in fig. 2.

For the clamping device in the embodiment, rectangular plates are clamped between the incomplete cylinder I3 and the incomplete cylinder II 2 and between the right-angle incomplete cylinder I9 and the right-angle incomplete cylinder II 8; the clamping of rectangular plates with different thicknesses can be realized by adjusting the adjusting nut 5, and the mounting and dismounting are convenient.

If the size of the rectangular plate is 400mm × 400mm, each side of the clamping device of the present embodiment needs to be formed by connecting two straight-side brackets 1; if the rectangular plate has dimensions of 400mm x 200mm, then two opposite sides of the clamping device according to this embodiment need to be formed by two straight-sided brackets 1 connected to each other. In practical application, rectangular plates with different lengths and widths can be clamped by adjusting the number and the size of the straight-edge brackets 1.

When the clamping device is used for clamping the rectangular plate to perform mechanical property test, the clamping device is fixedly arranged on the test bed through the L-shaped connecting piece 6. In practical applications, the clamping device can also be mounted on the test bed through the bottom plate, and the L-shaped connecting piece 6 needs to be mounted on the bottom plate.

In practical application, the clamping device can be made of aluminum alloy or titanium alloy, so that the influence of the rotational inertia of the clamping device on a test result during working is reduced.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.