CN215414292U

CN215414292U - Trapezoidal wave generator and impact test platform

Info

Publication number: CN215414292U
Application number: CN202121341225.5U
Authority: CN
Inventors: 周丽静; 陈益明; 徐曼
Original assignee: Suzhou Siliyo S & T Co ltd
Current assignee: Suzhou Dongling Testing Equipment Co ltd
Priority date: 2021-06-16
Filing date: 2021-06-16
Publication date: 2022-01-04
Anticipated expiration: 2031-06-16

Abstract

The utility model relates to a trapezoidal wave generator, comprising: the generator comprises a generator main body, wherein a hollow structure for a piston rod to pass through is arranged in the center of the generator main body along the axis direction of the generator main body, the generator main body comprises a shell, a piston and an end cover, and a circular closed cavity is formed among the shell, the piston and the end cover; the impact piece is provided with a first through hole for passing through the piston rod along an axis; the piston can compress the closed cavity under the impact of the impact piece. The trapezoidal wave generator solves the problem that a conventional trapezoidal wave generator cannot be installed under a working table due to interference of a piston rod on some existing impact test tables, and the piston rod passes through the center of the trapezoidal wave generator by adopting the overall hollow design for the trapezoidal wave generator, so that the trapezoidal wave generator is installed under the center of the working table to obtain an ideal waveform.

Description

Trapezoidal wave generator and impact test platform

Technical Field

The utility model relates to the technical field of mechanical environment tests, in particular to a trapezoidal wave generator and an impact test bed.

Background

The impact test equipment is mainly used for simulating the impact environment suffered by the tested piece in the service process and checking the functional reliability and structural integrity of the tested piece in the impact environment. In the impact test, 3 kinds of classical impact waveforms are commonly used, which are a half sine wave, a post-peak sawtooth wave and a trapezoidal wave respectively.

The conventional vertical impact test device mainly adopts a certain lifting mechanism to lift an impact piece to a certain height, then releases the impact piece, so that the impact piece and a tested piece fall onto a waveform generator together to generate a required impact waveform, but for a high-energy pneumatic vertical impact test bed with more excellent performance (such as an invention patent with an authorized publication number of CN 111649901B), the conventional trapezoidal wave test device cannot be installed and used due to the fact that a piston rod for pulling a working table to move is arranged in the center of the working table. If the piston rod is avoided and the two trapezoidal wave generators are symmetrically arranged on two sides below the working table, the synchronism of the two trapezoidal wave generators in the impact process cannot be ensured, and ideal impact waveforms cannot be obtained.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is to overcome the problem that the existing trapezoidal wave generator is not suitable for the impact test bed with the piston rod in the center, so that the trapezoidal wave generator and the impact test bed are provided, and the generator is simple in structure, stable and reliable and is suitable for the impact test bed with the piston rod in the center. In addition, the utility model also provides an impact test bed with the trapezoidal wave generator.

In order to solve the technical problem, the utility model provides a trapezoidal wave generator and an impact test bed, which comprise a generator main body; the center of the generator main body is provided with a hollow structure along the axis direction, and the hollow structure is used for passing through a piston rod; the generator main body comprises a shell, a piston and an end cover, the piston is arranged in the shell, the end cover is used for sealing the shell, and a circular closed cavity is formed among the shell, the piston and the end cover; an impact member; the impact piece is provided with a first through hole along the axis, and the first through hole is used for passing through the piston rod; the piston can compress the closed cavity under the impact of the impact piece.

In one embodiment of the utility model, the center of the end cover is provided with a cylindrical boss inside the shell, and the boss, the inner wall of the shell and the piston form the closed cavity.

In one embodiment of the utility model, the diameter of the first through hole is larger than the diameter of the piston rod.

In an embodiment of the utility model, the impact member is further provided with an impact portion for impacting the piston, the housing is provided with a second through hole for passing through the impact portion, and the diameter of the second through hole is larger than that of the impact portion.

In one embodiment of the utility model, the piston is provided with a third through hole along the axis, the third through hole is a stepped hole, the stepped hole comprises a first hole structure and a second hole structure, the diameter of the first hole structure is larger than that of the piston rod, the first hole structure is used for passing through the piston rod, the diameter of the second hole structure is larger than that of the first hole structure, and the second hole structure is matched with the end cover spigot.

In one embodiment of the utility model, the end cover is provided with a fourth through hole along the axis, the diameter of the fourth through hole is larger than that of the piston rod, and the fourth through hole is used for passing through the piston rod.

In one embodiment of the utility model, a seal is provided between the end cap and/or the housing and the piston, said seal being adapted to ensure the air tightness of the closed cavity.

In one embodiment of the utility model, a guide is provided between the end cap and/or the housing and the piston, which guide serves to guide the movement of the piston.

In one embodiment of the utility model, the shell is provided with an orifice which is communicated with the air source and the closed cavity, and the diameter of the orifice is set to be 1.5-3 mm.

In another object of the present invention, there is provided an impact test stand, which includes the trapezoidal wave generator.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

the utility model relates to a trapezoidal wave generator, which comprises: a generator body; the generator main body is provided with a hollow structure along the axis, and the hollow structure is used for passing through a piston rod; the generator main body comprises a shell, a piston and an end cover, wherein the piston is arranged in the shell, the end cover is used for sealing the shell, a cylindrical boss is arranged in the center of the end cover, and a circular closed cavity is formed among the shell, the piston and the boss; an impact member; the impact piece is provided with a through hole for passing through the piston rod, and the piston can compress the closed cavity under the impact of the impact piece. The trapezoidal wave generator solves the problem that a conventional trapezoidal wave generator cannot be installed under a working table due to the interference of the piston rod on some existing impact test tables, and the piston rod passes through the center of the trapezoidal wave generator by adopting the overall hollow design for the trapezoidal wave generator, so that the trapezoidal wave generator is installed under the center of the working table to obtain an ideal waveform, and the trapezoidal wave generator is simple in structure, reliable and practical.

Drawings

In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which

FIG. 1 is a front view of a trapezoidal wave generator in a preferred embodiment of the present invention;

FIG. 2 is a sectional view taken along A-A of the trapezoidal wave generator shown in FIG. 1;

FIG. 3 is an enlarged view of a portion A of FIG. 2;

FIG. 4 is a schematic three-dimensional structure diagram of a trapezoidal wave generator according to a preferred embodiment of the present invention;

FIG. 5 is a schematic diagram of the trapezoidal wave generator working on an impact test bench.

The specification reference numbers indicate:

1. a generator body; 11. a housing; 111. a second through hole; 112. an orifice; 12. a piston; 121. a first pore structure; 122. a second pore structure; 13. an end cap; 131. a boss; 132. a second mounting plate; 133. a fourth via hole; 14. sealing the cavity; 15. a guide member; 16. a seal member;

2. an impact member; 21. a first through hole; 22. a first mounting plate; 23. an impact section;

3. an impact test stand; 31. a work table; 32. a piston rod; 33. an anvil.

Detailed Description

The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the utility model pertains.

In the description of the present application, it is to be understood that the terms "longitudinal," "lateral," "central," "length," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting.

In the description of the present application, if "a number" is referred to, it means more than one, if "a plurality" is referred to, it means more than two, if "more than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "more than", "less than" or "within" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.

In the description of the present application, unless otherwise expressly stated or limited, the terms "mounted," "connected," "fixed," and the like are intended to be inclusive and mean, for example, that is, the terms "mounted," "connected," and the like may be fixedly connected or detachably connected, or may be integrally connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to 4, an embodiment of the present invention provides a trapezoidal wave generator, including a generator main body 1; the center of the generator body 1 is provided with a hollow structure along the axial direction thereof, and the hollow structure is used for passing through a piston rod 32; the generator main body 1 comprises a shell 11, a piston 12 and an end cover 13, wherein the piston 12 is arranged in the shell 11, the end cover 13 is used for sealing the shell 11, and a circular closed cavity 14 is formed among the shell 11, the piston 12 and the end cover 13; an impact member 2; the impact piece 2 is provided with a first through hole 21 along the axis, and the first through hole 21 is used for passing through the piston rod 32; the piston 12 can compress the closed cavity 14 under the impact of the impact member 2.

The trapezoidal wave generator of this embodiment comprises

A generator main body 1; the center of the generator body 1 is provided with a hollow structure along the axial direction thereof, and the hollow structure is used for preventing the piston rod 32 from interfering with the trapezoidal wave generator through the piston rod 32; the generator main body 1 comprises a shell 11, a piston 12 and an end cover 13, wherein the piston 12 is arranged in the shell 11, the end cover 13 is used for sealing the shell 11, a circular sealed cavity 14 is formed among the shell 11, the piston 12 and the end cover 13, specifically, a cylindrical boss 131 is arranged at the center of the end cover 13 in the shell 11, and the sealed cavity 14 is formed among the boss 131, the inner wall of the shell 11 and the piston 12;

an impact member 2; the material of the impact piece is preferably superhard aluminum alloy in the embodiment, in other embodiments, the impact piece can also be made of high manganese steel, high chromium cast iron, low carbon alloy steel and other materials with good impact performance, the impact piece 2 is provided with a first through hole 21 along the axis, and the first through hole 21 is used for preventing the piston rod 32 from interfering with the trapezoidal wave generator through the piston rod 32.

Specifically, referring to fig. 2, 3 and 5, the trapezoidal wave generator is required to inject gas into the closed cavity 14 before use, and therefore, a threaded hole is formed in the radial shell 11 of the closed cavity 14, and the threaded hole is used for connecting a high-pressure nitrogen gas cylinder. In the process of impacting the impact piece 2 and the generator main body 1, the impact part 23 positioned below the impact piece 2 collides with the piston 12 to push the piston 12 to move along the axial direction, so that the volume of the closed cavity 14 is reduced, nitrogen in the closed cavity 14 is compressed, and the required trapezoidal wave is obtained.

The trapezoidal wave generator solves the problem that the conventional trapezoidal wave generator cannot be arranged under the working table top 31 due to the interference of the piston rod 32 on some existing impact test tables, and the piston rod 32 penetrates through the center of the trapezoidal wave generator by adopting the overall hollow design for the trapezoidal wave generator, so that the trapezoidal wave generator is normally arranged under the working table top 31.

It is conceivable that the application range of the trapezoidal wave generator provided by the present invention is not limited to the interference of the piston rod 32, and the trapezoidal wave generator provided by the present invention is applicable to the case where the center of the impact test stand 3 is provided with other components that interfere with the existing trapezoidal wave generator, such as a guide rod.

Specifically, in order to facilitate the penetration of the piston rod 32 through the trapezoidal wave generator, the diameter of the first through hole 21 is larger than the diameter of the piston rod 32.

Specifically, a second through hole 111 is formed in the housing, the second through hole 111 is used for passing through the impact portion 23, and the diameter of the second through hole 111 is larger than that of the impact portion 23.

Specifically, the piston 12 is provided with a third through hole along an axis, the third through hole is a stepped hole, the stepped hole includes a first hole structure 121 and a second hole structure 122, a diameter of the first hole structure 121 is greater than a diameter of the piston rod 32, the first hole structure 121 is configured to pass through the piston rod 32 to avoid interference between the piston rod 32 and the trapezoidal wave generator, a diameter of the second hole structure 122 is greater than a diameter of the first hole structure 121, the second hole structure 122 is located below the first hole structure 121, and the second hole structure 122 is in a stop fit with the end cover 13. Assuming that the inner diameter of the housing 11 is y, the diameter of the second hole structure 122 is x, and the pressure of the nitrogen gas introduced into the closed cavity 14 is P, the maximum thrust force F that the piston 12 can provide is:

specifically, the end cover 13 is provided with a fourth through hole 133 along the axis, the diameter of the fourth through hole 133 is larger than that of the piston rod 32, and the fourth through hole 133 is used for passing through the piston rod 32.

In addition, referring to fig. 2, in the present embodiment, a sealing member 16 is disposed between the end cap 13 and the piston 12, and a sealing member 16 is also disposed between the housing 11 and the piston 12, the sealing member 16 is preferably a rubber sealing ring, and the sealing member 16 is configured to ensure airtightness of the sealed cavity 14, so as to prevent the sealed cavity 14 from communicating with the external atmosphere through a gap between the housing 11 and the piston 12 and a gap between the piston 12 and the end cap 13, which may cause leakage of nitrogen gas to affect the test effect, and may not obtain an ideal waveform. In other embodiments, the sealing member 16 may be provided only between the end cover 13 and the piston 12 or only between the housing 11 and the piston 12, according to actual requirements.

Similarly, referring to fig. 2, in this embodiment, a guide 15 is disposed between the end cap 13 and the piston 12, the guide 15 is a guide ring made of POM plastic, PA plastic or other wear-resistant materials, the guide ring is used for guiding the movement of the piston 12, and the guide ring can prevent the end cap 13 and the piston 12 from directly contacting and rubbing, so as to protect the housing 11 and the piston 12 from being damaged. In other embodiments, according to actual requirements, the guide 15 may be provided between the end cover 13 and the piston 12, between the housing 11 and the piston 12, or only the guide 15 may be provided between the housing 11 and the piston 12.

In addition, referring to fig. 2, 3 and 4, an orifice 112 is provided on the housing, the orifice 112 communicates the air source with the closed cavity 14, the orifice 112 plays a role of throttling, so as to prevent the nitrogen in the closed cavity 14 from overflowing when the trapezoidal wave generator is impacted, which causes large fluctuation of an air supply pipeline connected outside the trapezoidal wave generator due to impact force at the moment of compressing the closed cavity 14, the diameter of the orifice 112 can be adjusted according to actual requirements, and in this embodiment, the diameter of the orifice 112 is preferably set to be 1.5-3 mm.

The embodiment of the utility model also provides an impact test bed 3, and as shown in fig. 5, the impact test bed 3 comprises the trapezoidal wave generator, and the piston rod 32 of the impact test bed 3 penetrates through the entire trapezoidal wave generator. It is conceivable that the impact member 2 is further provided with a first mounting plate 22, and the first mounting plate 22 can fix the impact member 2 on the working table 31 of the impact test stand 3 through bolt connection or other connection modes; the end cap 13 is further provided with a second mounting plate 132, and the second mounting plate 132 can fix the end cap 13 on the anvil 33 of the impact test stand 3 through bolt connection or other connection methods. In other embodiments, the trapezoidal wave generator may be mounted in such a way that the impact member 2 is fixed to an anvil of the impact test bed 3 and the end cap 13 is fixed to a table top of the impact test bed 3.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the utility model may be made without departing from the spirit or scope of the utility model.

Claims

1. A trapezoidal wave generator, comprising:

a generator body; the center of the generator main body is provided with a hollow structure along the axis direction, and the hollow structure is used for passing through a piston rod; the generator main body comprises a shell, a piston and an end cover, the piston is arranged in the shell, the end cover is used for sealing the shell, and a circular closed cavity is formed among the shell, the piston and the end cover;

an impact member; the impact piece is provided with a first through hole along the axis, and the first through hole is used for passing through the piston rod;

the piston can compress the closed cavity under the impact of the impact piece.

2. A trapezoidal wave generator according to claim 1, wherein: the center of the end cover is provided with a cylindrical boss inside the shell, and the closed cavity is formed among the boss, the inner wall of the shell and the piston.

3. A trapezoidal wave generator according to claim 1, wherein: the diameter of the first through hole is larger than that of the piston rod.

4. A trapezoidal wave generator according to claim 1, wherein: the impact piece is further provided with an impact part for impacting the piston, a second through hole is formed in the shell and used for allowing the impact part to pass through, and the diameter of the second through hole is larger than that of the impact part.

5. A trapezoidal wave generator according to claim 1, wherein: the piston is equipped with the third through-hole along the axis, the third through-hole is the shoulder hole, the shoulder hole includes first pore structure and second pore structure, first pore structure diameter is greater than the diameter of piston rod, first pore structure is used for passing through the piston rod, second pore structure diameter is greater than first pore structure diameter, the second pore structure with the cooperation of end cover tang.

6. A trapezoidal wave generator according to claim 1, wherein: the end cover is provided with a fourth through hole along the axis, the diameter of the fourth through hole is larger than that of the piston rod, and the fourth through hole is used for passing through the piston rod.

7. A trapezoidal wave generator according to claim 1, wherein: and a sealing element is arranged between the end cover and/or the shell and the piston and is used for ensuring the air tightness of the closed cavity.

8. The trapezoidal wave generator according to claim 1 or 7, wherein: and a guide piece is arranged between the end cover and/or the shell and the piston, and is used for guiding the movement of the piston.

9. A trapezoidal wave generator according to claim 1, wherein: and the shell is provided with a throttling hole, the throttling hole is communicated with an air source and the closed cavity, and the diameter of the throttling hole is set to be 1.5-3 mm.

10. An impact test stand comprising a trapezoidal wave generator according to any one of claims 1 to 9.