CN211235222U - A mechanical viscoelastic material multi-specimen creep performance testing device - Google Patents

Abstract

The utility model relates to a multi-specimen creep performance testing device for mechanical viscoelastic materials, which relates to a creep testing device for viscoelastic materials such as rubber, asphalt, propellant, etc., in particular to a multi-specimen creep test device for mechanical viscoelastic materials. The performance testing device includes a fixture support plate, a plurality of clamp bodies are arranged on the fixture support plate, the clamp body includes an upper clamp body and a lower clamp body, and the lower clamp body is vertically hoisted on the upper clamp body The upper clamp specifically includes an upper clamp base plate, one end of the upper clamp base plate is rotatably connected to the support plate of the clamp body, the other end of the upper clamp base plate is provided with a clamping limiting device, and the lower clamp body is provided with a limited The utility model is suitable for a variety of viscoelastic materials such as rubber, asphalt, propellant, etc.; the ruler cooperates with the camera to measure the elongation, the precision is high, and the real-time monitoring and measurement can be ensured.

Description

A mechanical viscoelastic material multi-specimen creep performance testing device

technical field

The utility model relates to a creep testing device for viscoelastic materials such as rubber, asphalt, propellant, etc., in particular to a multi-test piece creep performance testing device for mechanical viscoelastic materials.

Background technique

Creep refers to the phenomenon that the strain of a solid material increases with time under the condition that the stress remains unchanged. Plastic deformation usually occurs after the stress exceeds the elastic limit, while creep can also occur when the stress is less than the elastic limit, as long as the stress is applied for a relatively long time. During the use and storage of viscoelastic materials such as rubber, asphalt and propellant, especially during the storage of solid rocket motors, the solid propellant will have a creep effect under its own weight, which will affect the internal medicinal properties of the solid rocket motor. , so that its work performance is degraded, and even safety accidents occur. Therefore, in order to analyze the storage reliability of solid rocket motors, it is necessary to study the creep characteristics of solid rocket motors.

At present, the creep measurement devices used by major domestic research institutions are all performed on a single specimen and under the condition of relatively high stress level, which will cause large fluctuations in tensile force, and the test load cannot reflect the actual working conditions of the workpiece. The test environment is difficult to control and other shortcomings. In addition, since the creep test takes a long time, the cost of using a complex electronic creep tester is too high, which is likely to cause a large waste of manpower and energy.

Utility model content

In order to solve the above problems, the utility model provides a multi-specimen creep property testing device for mechanical viscoelastic material, which can test the creep properties of viscoelastic materials together with multiple specimens, and the measurement is fast and stable.

The utility model relates to a mechanical viscoelastic material multi-specimen creep performance testing device, comprising a clamp support plate, a plurality of clamp bodies are arranged on the clamp support plate, and the clamp body includes an upper clamp body and a lower clamp body. the lower clamp body is hoisted on the upper clamp body in the vertical direction;

The upper clamp specifically includes an upper clamp base plate, one end of the upper clamp base plate is rotatably connected to the support plate of the clamp body, the other end of the upper clamp base plate is provided with a clamping limit device, and the lower clamp body is provided with a limit card. The clamping and limiting device on the bottom plate of the upper clamp is connected with the upper clamp structure of the lower clamp body through the test piece. The lower clamp body is connected to a tray through a tray connecting rod arranged vertically, and the tray A weight is provided, and the tray connecting rod is rotatably connected with the lower clamp body;

It also includes a ruler, one end of the ruler is rotatably arranged on the clamp support plate, and is located on one side of the upper clamp body, and the other end of the ruler extends along the vertical direction;

An auxiliary clamping limiting device is also arranged on the bottom plate of the upper clamping body.

Preferably, the test piece includes an end of an upper test piece and an end of a lower test piece, the end of the upper test piece and the end of the lower test piece are connected by a tensile part of the test piece, and one end of the tensile part of the test piece is connected to the upper The end of the test piece is connected by the arc transition, and the other end of the tensile part of the test piece is connected with the circular arc at the end of the lower test piece;

The width of the tensile part of the specimen is smaller than the width of the upper specimen end and the lower specimen end of the specimen.

Preferably, the clamping and limiting device includes two cylindrical jackets rotatably arranged on the bottom plate of the upper clamp, the central axes of the cylindrical jackets are located on the same horizontal plane, and the distance between the two cylindrical jackets is the same as the distance between the two cylindrical jackets. The widths of the tensile parts of the test pieces are matched, and the ends of the upper test pieces are located above the horizontal plane where the central axes of the two cylindrical jackets are located.

Preferably, the position-limiting engaging structure includes a lower test piece end accommodating through hole provided on the lower clamp body, and the shape of the lower test piece end accommodating through hole matches the lower test piece end, and the lower test piece end The opening in the vertical direction of the accommodating through hole is smaller than the width of the end of the lower test piece.

Preferably, the thickness of the lower clamp body is the same as the thickness of the end of the lower specimen;

The upper clamp bottom plate is connected with the clamp support plate through connecting pins, and the central axis of the connecting pins is located in the horizontal plane.

Or preferably, the auxiliary clamping and limiting device includes a sliding block fixing seat fixedly arranged on the bottom plate of the upper clamp, the sliding block fixing seat is provided with a sliding groove and a threaded hole communicating with each other, and the threaded hole and the sliding groove are along the edge of the sliding groove. The sliding groove is arranged in the vertical direction, and the sliding groove is arranged on the slider fixing seat between the threaded hole and the clamping and limiting device, the sliding groove is provided with a sliding block, and the threaded hole is threadedly connected with a sliding block bolt , one end of the slider bolt extends from the end of the threaded hole away from the chute, and extends from the threaded hole to abut against the slider;

Turn the slider bolt, the slider bolt squeezes the slider and extends toward the clamping limit device.

Preferably, the fixture support plate is provided with the same number of ruler chutes as the number of rulers, the ruler chutes are all vertically arranged, a ruler fixing pin is slidably arranged in the ruler chutes, and one end of the ruler fixing pin is connected to the ruler chutes, The other end is connected to the ruler in rotation;

The ruler fixing pin is provided with a thread, and the ruler fixing pin is threadedly connected with two locking nuts, and the two nuts are respectively located on both sides of the fixture support plate.

Preferably, one side of the scale on which the scale is set is flush with one side of the lower clamp body, and the side of the lower clamp body and the side on which the scale is set on the scale are located on the same side of the fixture support plate.

Preferably, both ends of the clamp support plate are connected to a base respectively through base support rods;

Both ends of the fixture support plate are provided with installation through holes, the base support rod is connected with a limit nut through threads, the outer diameter of the limit nut is larger than the diameter of the installation through hole, and the limit nut is located at the same vertical height The mounting through hole is sleeved on the base support rod above the limit nut, and the limit nut abuts against the fixture support plate.

Or preferably, it also includes two auxiliary support bases, the two auxiliary support bases are connected by an auxiliary support rod, and the auxiliary support rods are arranged horizontally;

One end of the connecting pin is connected to the clamp support plate through the upper clamp bottom plate, and the other end is arranged on the auxiliary support rod; the upper clamp base plate is located in the area between the auxiliary support rod and the clamp support plate.

The utility model is suitable for a variety of viscoelastic materials such as rubber, asphalt, propellant, etc. The ruler cooperates with the camera to measure the elongation, the precision is high, and the real-time monitoring and measurement can be ensured.

The utility model adjusts the height of the fixture support plate through the limit nut, is suitable for the coordinated use of various physical spaces such as a constant temperature and humidity box, an aging box, etc., and ensures the environmental control required for the test.

A sliding block fixing seat is installed on the bottom plate of the upper fixture of the utility model, and a vertically arranged chute is arranged on the sliding block fixing seat. At the same time, under the action of two cylindrical jackets whose central axes are located in the same horizontal plane, the test piece is guaranteed to be in a vertical state.

The bottom plate of the upper fixture of the utility model is rotatably connected with the fixture support plate through a connecting pin, the central axis of the connecting pin is located in the horizontal plane, and under the action of gravity, the test piece is guaranteed to be in a vertical state at all times during the test process.

The fixture support plate of the utility model can simultaneously install a plurality of test pieces for measurement, and has high test efficiency.

The utility model has the advantages of simple working principle, convenient operation, reliable measurement results, strong versatility and low cost. The utility model can change the load through weights in the test process, which is stable, energy-saving and environmentally friendly.

Description of drawings

Figure 1 is a schematic structural diagram of the utility model.

FIG. 2 is a left side view of FIG. 1 .

Figure 3 is a schematic diagram of the structure of the test piece.

FIG. 4 is a top view of FIG. 3 .

Reference signs: 1-base, 2-base support rod, 3-limit nut, 4-fixture support plate, 5-auxiliary support rod, 6-auxiliary support base, 7-ruler, 8-upper clamp bottom plate, 9- Connecting pin, 10-slide block fixing seat, 11-slider fixing seat bolt, 12-slider bolt, 13-slider block, 14-specimen, 15-cylindrical jacket, 16-jacket fixing pin, 17- Lower clamp body, 18-rotating fixed handle, 19-tray, 20-weight, 21-end of upper specimen, 22-end of lower specimen, 23-extraction part of specimen.

Detailed ways

The utility model is a mechanical viscoelastic material multi-test piece 14 creep performance testing device, comprising a clamp support plate 4, a plurality of clamp bodies are arranged on the clamp support plate 4, and the clamp body includes an upper clamp body and a lower clamp body A clamp body 17, the lower clamp body 17 is hoisted on the upper clamp body in the vertical direction;

The upper clamp specifically includes an upper clamp base plate 8, one end of the upper clamp base plate 8 is rotatably connected to the support plate of the clamp body, the other end of the upper clamp base plate 8 is provided with a clamping and limiting device, and the lower clamp body 17 is on the top. A limit clamping structure is provided, and the clamping and limiting device on the upper clamp bottom plate 8 is connected with the upper clamp structure of the lower clamp body 17 through the test piece 14, and the lower clamp body 17 is connected by a vertically arranged tray 19. The rod is connected to a tray 19, the tray 19 is provided with a weight 20, and the tray 19 connecting rod is rotatably connected to the lower clamp body 17 through the rotating fixed handle 18;

Also includes a ruler 7, one end of the ruler 7 is rotatably arranged on the clamp support plate 4, and is located on one side of the upper clamp body, and the other end of the ruler 7 extends along the vertical direction;

An auxiliary clamping limiting device is also arranged on the bottom plate of the upper clamping body.

The test piece 14 includes an upper test piece end 21 and a lower test piece end 22, and the upper test piece end 21 and the lower test piece end 22 are connected by a test piece stretching part 23, and the test piece stretching part 23 One end of the test piece is connected with the arc transition of the end 21 of the upper test piece, and the other end of the tensile part 23 of the test piece is connected with the circular arc of the end 22 of the lower test piece;

The width of the tensile portion 23 of the specimen is smaller than the width of the upper specimen end portion 21 and the lower specimen end portion 22 of the specimen 14 .

The clamping and limiting device includes two cylindrical jackets 15 rotatably arranged on the bottom plate 8 of the upper clamp, the central axes of the cylindrical jackets 15 are located on the same horizontal plane, and the distance between the two cylindrical jackets 15 Matching with the width of the tensile part 23 of the specimen, the upper specimen end 21 is located above the horizontal plane where the central axes of the two cylindrical jackets 15 are located. 8 are connected in rotation, and the fixing pin 16 of the jacket is fixedly connected with the bottom plate 8 of the upper clamp.

The position-limiting snap-fit structure includes an accommodating through hole at the end portion 22 of the lower specimen provided on the lower clamping body 17 , and the shape of the accommodating through hole at the end portion 22 of the lower specimen matches the end portion 22 of the lower specimen, and the lower specimen end 22 accommodates a through hole in shape. The opening of the receiving through hole of the end portion 22 in the vertical direction is smaller than the width of the end portion 22 of the lower test piece.

The thickness of the lower clamp body 17 is the same as the thickness of the lower specimen end 22;

The upper clamp bottom plate 8 is connected to the clamp support plate 4 through a connecting pin 9, and the central axis of the connecting pin 9 is located in the horizontal plane.

The auxiliary clamping and limiting device includes a sliding block fixing seat 10 fixedly arranged on the bottom plate 8 of the upper clamp. The sliding block fixing seat 10 is provided with a sliding groove and a threaded hole communicating with each other, and the threaded hole and the sliding groove are vertically arranged. The sliding slot is arranged in a straight direction, and the sliding slot is arranged on the slider fixing seat 10 between the threaded hole and the clamping and limiting device. Bolt 12, one end of the slider bolt 12 extends from the end of the threaded hole away from the chute, and extends from the threaded hole to abut against the slider 13; the slider fixing seat 10 is connected to the upper fixture through the slider fixing seat bolt 11 The bottom plate 8 is fixedly connected;

When the slider bolt 12 is rotated, the slider bolt 12 presses the slider 13 and protrudes toward the clamping limit device.

The fixture support plate 4 is provided with a ruler 7 chute with the same number as the ruler 7, and the ruler 7 chute is vertically arranged, and a ruler 7 fixing pin is slidably arranged in the ruler 7 chute, and one end of the ruler 7 fixing pin is connected to the ruler. 7 The chute is connected, and the other end is connected with the ruler 7 in rotation;

The fixing pin of the ruler 7 is provided with a thread, and the fixing pin of the ruler 7 is threadedly connected with two locking nuts, and the two nuts are respectively located on both sides of the fixture support plate 4 .

The side of the scale 7 with the scale is flush with one side of the lower clamp body 17 , and the side of the lower clamp body 17 and the scale of the scale 7 are located on the same side of the clamp support plate 4 .

Two ends of the fixture support plate 4 are respectively connected to a base 1 through the base support rod 2;

The two ends of the fixture support plate 4 are provided with installation through holes, and the base support rod 2 is connected with a limit nut 3 through a thread. The outer diameter of the limit nut 3 is larger than the diameter of the installation through hole, and the limit nut 3 Located at the same vertical height, the mounting through hole is sleeved on the base support rod 2 above the limit nut 3 , and the limit nut 3 is abutted against the clamp support plate 4 .

Also includes two auxiliary support bases 6, the two auxiliary support bases 6 are connected by auxiliary support rods 5, and the auxiliary support rods 5 are arranged horizontally;

One end of the connecting pin 9 is connected to the clamp support plate 4 through the upper clamp bottom plate 8, and the other end is arranged on the auxiliary support rod 5; the upper clamp bottom plate 8 is located in the area between the auxiliary support rod 5 and the clamp support plate 4 Inside.

When in use, adjust the height of the ruler 7 so that the scale of the ruler 7 is aligned with the upper edge of the lower clamp body 17, adjust the camera so that the camera is aimed at the measurement area of the test piece 14, and turn on the camera switch to record. The rotating fixed handle 18 and the weight 20 tray 19 are installed by pins, and the weight 20 required for the test is selected and added to the tray 19 . The upper fixture bottom plate 8 is suspended and installed on the fixture support plate 4 through the connecting pin 9, and the test piece 14 is clamped on the circular jacket, so that the test piece 14 is closely attached to the upper fixture bottom plate 8, and the slider bolt 12 is adjusted to make the slider 13 Tighten the test piece 14. When installing the test pieces 14 with different thicknesses, it is only necessary to replace the lower fixture with the same thickness as the test pieces 14 .

In another embodiment, when the utility model is used in combination with the aging box, the auxiliary support base 6 is placed in the installation hole on the side of the inner space of the aging box, and then the auxiliary support rod 5 is placed on the auxiliary support base 6 . When the connecting pin 9 is placed on the auxiliary support rod 5, the height of the clamp support plate 4 can be adjusted by adjusting the limit nut 3, so that the connecting pin 9 is in a stable state.

The utility model is suitable for rubber, asphalt, propellant and other viscoelastic materials; the ruler 7 cooperates with the camera to measure the elongation, the precision is high, and the real-time monitoring and measurement can be ensured.

The utility model adjusts the height of the fixture support plate 4 through the limit nut 3, is suitable for the coordinated use of various physical spaces such as a constant temperature and humidity box, an aging box, etc., and ensures the environmental control required for the test.

A sliding block fixing seat 10 is installed on the bottom plate 8 of the upper fixture of the present invention, and a vertical sliding groove is arranged on the sliding block fixing seat 10. It is pressed against the test piece 14, and at the same time, under the action of the two cylindrical jackets 15 whose central axes are located in the same horizontal plane, the test piece 14 is guaranteed to be in a vertical state.

The upper clamp bottom plate 8 of the utility model is rotatably connected to the clamp support plate 4 through the connecting pin 9, the central axis of the connecting pin 9 is located in the horizontal plane, and under the action of gravity, the test piece 14 is guaranteed to be in a vertical state at all times during the test process.

The fixture support plate 4 of the utility model can simultaneously install a plurality of test pieces 14 for measurement, and the test efficiency is high.

The utility model has the advantages of simple working principle, convenient operation, reliable measurement results, strong versatility and low cost. The load is changed by the weight 20 in the test process, which is stable, energy-saving and environmentally friendly.

Claims (10)

1. The mechanical testing device for the creep performance of the multi-test piece of the viscoelastic material comprises a clamp supporting plate (4), and is characterized in that a plurality of clamp bodies are arranged on the clamp supporting plate (4), each clamp body comprises an upper clamp body and a lower clamp body (17), and the lower clamp bodies (17) are vertically hoisted on the upper clamp bodies;

the upper clamp body comprises an upper clamp bottom plate (8), one end of the upper clamp bottom plate (8) is rotatably connected with a clamp body supporting plate, the other end of the upper clamp bottom plate (8) is provided with a clamping limiting device, the lower clamp body (17) is provided with a limiting clamping structure, the clamping limiting device on the upper clamp bottom plate (8) is connected with the limiting clamping structure on the lower clamp body (17) through a test piece (14), the lower clamp body (17) is connected with a tray (19) through a vertically arranged tray (19) connecting rod, a weight (20) is arranged on the tray (19), and the tray (19) connecting rod is rotatably connected with the lower clamp body (17);

the clamp is characterized by further comprising a scale (7), wherein one end of the scale (7) is rotatably arranged on the clamp supporting plate (4) and is positioned on one side of the upper clamp body, and the other end of the scale (7) extends out in the vertical direction;

and an auxiliary clamping limiting device is also arranged on the bottom plate of the upper clamp body.

2. The mechanical multi-specimen creep performance testing device for the viscoelastic material as claimed in claim 1, wherein the specimen (14) comprises an upper specimen end part (21) and a lower specimen end part (22), the upper specimen end part (21) and the lower specimen end part (22) are connected through a specimen stretching part (23), one end of the specimen stretching part (23) is connected with the upper specimen end part (21) through an arc transition, and the other end of the specimen stretching part (23) is connected with the lower specimen end part (22) through an arc transition;

the width of the specimen stretching part (23) is smaller than the widths of the upper specimen end part (21) and the lower specimen end part (22) of the specimen (14).

3. The mechanical multi-specimen creep performance testing device for the viscoelastic material as claimed in claim 2, wherein the clamping and limiting device comprises two cylindrical jackets (15) rotatably arranged on the bottom plate (8) of the upper fixture, the central axes of the cylindrical jackets (15) are positioned on the same horizontal plane, the distance between the two cylindrical jackets (15) is matched with the width of the specimen stretching part (23), and the end part (21) of the upper specimen is positioned above the horizontal plane where the central axes of the two cylindrical jackets (15) are positioned.

4. The mechanical multi-specimen creep performance testing device for the viscoelastic material as claimed in claim 3, wherein the limiting and clamping structure comprises a lower specimen end portion (22) accommodating through hole arranged on the lower fixture body (17), the shape of the lower specimen end portion (22) accommodating through hole matches with that of the lower specimen end portion (22), and the opening of the lower specimen end portion (22) accommodating through hole in the vertical direction is smaller than the width of the lower specimen end portion (22).

5. The mechanical multi-specimen creep performance testing device for the viscoelastic material as claimed in claim 4, wherein the thickness of the lower clamp body (17) is the same as that of the end part (22) of the lower specimen;

the upper clamp bottom plate (8) is connected with the clamp supporting plate (4) through a connecting pin (9), and the central axis of the connecting pin (9) is located in the horizontal plane.

6. The mechanical multi-test-piece creep performance testing device for the viscoelastic material is characterized in that the auxiliary clamping limiting device comprises a slide block fixing seat (10) fixedly arranged on the upper clamp base plate (8), the slide block fixing seat (10) is provided with a sliding groove and a threaded hole which are communicated with each other, the threaded hole and the sliding groove are arranged in the vertical direction, the sliding groove is arranged on the slide block fixing seat (10) between the threaded hole and the clamping limiting device, a slide block (13) is arranged in the sliding groove, a slide block bolt (12) is connected with the threaded hole in a threaded manner, one end of the slide block bolt (12) extends into the threaded hole from one end, far away from the sliding groove, of the threaded hole, and abuts against the slide block (13) after extending out of;

the sliding block bolt (12) is rotated, and the sliding block bolt (12) extrudes the sliding block (13) to extend out towards the clamping limiting device.

7. The mechanical multi-test-piece creep performance testing device for the viscoelastic material is characterized in that the clamp supporting plate (4) is provided with the same number of sliding grooves of the scales (7), the sliding grooves of the scales (7) are vertically arranged, the sliding grooves of the scales (7) are internally provided with scale (7) fixing pins in a sliding manner, one end of each scale (7) fixing pin is connected with the corresponding sliding groove of the scale (7), and the other end of each scale (7) fixing pin is rotatably connected with the corresponding scale (7);

the two locking nuts are connected to the scale (7) fixing pin in a threaded mode, and the two locking nuts are located on the two sides of the clamp supporting plate (4) respectively.

8. The mechanical multi-specimen creep performance testing device for the viscoelastic material as claimed in claim 7, wherein the side of the scale (7) provided with the scale is flush with one side of the lower fixture body (17), and the side of the lower fixture body (17) and the side of the scale (7) provided with the scale are located on the same side of the fixture supporting plate (4).

9. The mechanical multi-specimen creep performance testing device for viscoelastic materials of claim 8, wherein the two ends of the clamp supporting plate (4) are respectively connected with a base (1) through base supporting rods (2);

be provided with the installation through-hole on the both ends of anchor clamps backup pad (4), base bracing piece (2) have stop nut (3) through threaded connection, and the external diameter of stop nut (3) is greater than the diameter of installation through-hole, stop nut (3) are located same vertical height, and the installation through-hole cup joints on base bracing piece (2) of stop nut (3) top, and stop nut (3) offset with anchor clamps backup pad (4).

10. The mechanical multi-specimen creep performance testing device for the viscoelastic material as claimed in claim 9, further comprising two auxiliary supporting bases (6), wherein the two auxiliary supporting bases (6) are connected through an auxiliary supporting rod (5), and the auxiliary supporting rod (5) is horizontally arranged;

one end of the connecting pin (9) penetrates through the upper clamp bottom plate (8) to be connected with the clamp supporting plate (4), and the other end of the connecting pin is arranged on the auxiliary supporting rod (5); the upper clamp bottom plate (8) is positioned in the area between the auxiliary support rod (5) and the clamp support plate (4).

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