Limiting device and elastic limiting block thereof

Abstract

The invention relates to a limiting device and an elastic limiting block thereof. The elastic limiting block is of a rectangular structure, a first comb tooth part and a second comb tooth part are formed at one end of the elastic limiting block in the length direction, the first comb tooth part comprises n elastic limiting pieces which are arranged at intervals in the length direction, and the second comb tooth part comprises a rigid limiting piece. According to the limiting device and the elastic limiting block thereof, the operation reliability of a rotating mechanism can be effectively improved, overlarge collision impact is avoided, the structure is compact, and assembling is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical parts manufacturing, and in particular to a limiting device and an elastic limiting block thereof, which are applicable to the field of aerospace motion mechanisms. Background Art

[0002] The limit mechanism is mainly used to limit the rotation range of the rotating mechanism, to prevent the load from colliding with the rotating mechanism body or the wiring harness from being entangled when the rotating mechanism rotates continuously in the same direction, causing accidents, or to limit the rotation range of the rotating mechanism, especially the rotation stroke, to avoid runaway and other conditions during the rotation process.

[0003] At present, the limit mechanisms used in aerospace motion engineering include hard limit mechanisms, elastic limit mechanisms, and limit mechanisms that combine electric limit mechanisms with mechanical limit mechanisms. The overall structure is cumbersome, the assembly is complex, the space occupied is large, the maintainability and reliability are poor, and they cannot meet the requirements of aerospace projects such as light weight, small space, and high reliability, so they have certain limitations in use. Summary of the invention

[0004] In view of the above problems in the prior art, the present invention proposes a limit device and an elastic limit block thereof, which can effectively improve the operating reliability of the rotating mechanism, avoid excessive collision impact, have a compact structure, and are easy to assemble.

[0005] Specifically, the present invention proposes an elastic limit block with a rectangular structure, and a first comb tooth portion and a second comb tooth portion are formed at one end in the length direction. The first comb tooth portion includes n elastic limit plates arranged at intervals along the length direction, and the second comb tooth portion includes a rigid limit plate.

[0006] According to an embodiment of the present invention, the elastic limit block is made of spring steel 65Mn.

[0007] According to an embodiment of the present invention, n grooves are formed on the surface of the elastic limiting block, and the grooves are used to space adjacent elastic limiting pieces and to space the first comb-tooth portion and the second comb-tooth portion.

[0008] According to an embodiment of the present invention, the n grooves are of the same size.

[0009] According to an embodiment of the present invention, the bottom surfaces of the n grooves are arc surfaces.

[0010] According to an embodiment of the present invention, the n elastic limiting pieces are of the same size.

[0011] The present invention also provides a limiting device, which is applicable to a rotating mechanism, and the limiting device comprises a limiting stopper and the aforementioned elastic limiting block;

[0012] The limit stop is arranged on the rotating mechanism and can rotate with the rotor of the rotating mechanism. The elastic limit block is arranged on the stator of the rotating mechanism. The plane where the elastic limit block is located is consistent with the rotation plane where the limit stop is located. The elastic limit block is used to limit the rotation of the limit stop.

[0013] According to an embodiment of the present invention, a center line of the elastic limiting block in the length direction intersects with a rotation axis of the rotating mechanism.

[0014] According to an embodiment of the present invention, during the process of the elastic limiting block limiting the limiting block, the limiting block touches the first comb tooth portion.

[0015] According to one embodiment of the present invention, the calculation formula of the positive pressure F formed by the compression of each elastic limiting piece of the first comb tooth portion is:

[0016]

[0017] Solve the deflection ω through the normal pressure F;

[0018] Each elastic limiting piece of the first comb tooth portion is compressed to form an elastic potential energy A e The calculation formula is:

[0019]

[0020] The kinetic energy E of the rotating mechanism e The calculation formula is:

[0021]

[0022] When A e >E e , the elastic limit block can provide a limiting effect on the limit stop block;

[0023] Among them, n is the number of the elastic limit plates, ω is the deflection, the length, width and height of a single elastic limit plate are l×b×h, E is the elastic modulus of the material of the elastic limit plate, K is the stiffness of the elastic limit plate, I is the moment of inertia of the rotor of the rotating mechanism, and a is the angular acceleration of the rotor of the rotating mechanism.

[0024] A limit device and an elastic limit block thereof provided by the present invention provide elastic potential energy after material compression through a comb tooth structure, which can effectively avoid damage to the rotating mechanism and the load caused by excessive collision impact, improve the operating reliability of the rotating mechanism, and have a compact overall structure and are easy to assemble.

[0025] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are included to provide further explanation of the present invention, and are incorporated into and constitute a part of this application. The accompanying drawings illustrate embodiments of the present invention and together with the description serve to explain the principle of the present invention.

[0027] In the attached figure:

[0028] Figure 1 A schematic structural diagram of an elastic limit block according to an embodiment of the present invention is shown.

[0029] Figure 2 yes Figure 1 Schematic diagram of the structure of the elastic limit plate.

[0030] Figure 3A The schematic diagram shows the elastic limit block of an embodiment of the present invention during the compression process. Figure 1 .

[0031] Figure 3B The schematic diagram shows the elastic limit block of an embodiment of the present invention during the compression process. Figure 2 .

[0032] Figure 3C Schematic diagram 3 shows the elastic limit block of an embodiment of the present invention during the compression process.

[0033] Figure 3D The schematic diagram shows the elastic limit block of an embodiment of the present invention during the compression process. Figure 4 .

[0034] Figure 3E Schematic diagram 5 shows the elastic limit block of an embodiment of the present invention during the compression process.

[0035] Figure 4 A schematic structural diagram of a limiting device according to an embodiment of the present invention is shown.

[0036] The above drawings include the following reference numerals:

[0037] Elastic limit block 100

[0038] First comb tooth portion 101

[0039] Second comb tooth portion 102

[0040] Elastic limit piece 103

[0041] The first elastic limiting piece 1031

[0042] The second elastic limiting piece 1032

[0043] The third elastic limiting piece 1033

[0044] Fourth elastic limiting piece 1034

[0045] Rigid limit piece 104

[0046] Groove 105

[0047] Arc 106

[0048] Limit device 200

[0049] Limit stop 201

[0050] Rotating mechanism 300 DETAILED DESCRIPTION

[0051] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0052] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0055] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0056] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0057] Figure 1 A schematic structural diagram of an elastic limit block according to an embodiment of the present invention is shown. Figure 2 yes Figure 1Schematic diagram of the structure of the elastic limit piece in. As shown in the figure, an elastic limit block 100 is a rectangular structure, and a first comb tooth portion 101 and a second comb tooth portion 102 are formed at one end in the length direction. The first comb tooth portion 101 includes n elastic limit pieces 103 spaced apart along the length direction, and the second comb tooth portion 102 includes a rigid limit piece 104. The width of the rigid limit piece 104 is significantly greater than the width of a single elastic limit piece 103. The elastic limit block 100 is small in size and easy to process.

[0058] Preferably, the elastic stopper 100 is made of spring steel 65Mn. Spring steel 65Mn improves hardenability through manganese, and φ12mm steel can be hardened in oil. The surface decarburization tendency is smaller than that of silicon steel, and the comprehensive mechanical properties after heat treatment are better than those of carbon steel. It is suitable for making various small-sized flat and round springs, seat springs, spring springs, spring rings, valve springs, clutch reeds, brake springs, cold-drawn steel wire cold-wound spiral springs, etc.

[0059] Preferably, n grooves 105 are formed on the surface of the elastic limiting block 100. The grooves 105 are used to separate adjacent elastic limiting pieces 103 and to separate the first comb-tooth portion 101 and the second comb-tooth portion 102. More preferably, the n grooves 105 have the same size for easy processing.

[0060] Preferably, the bottom surface of the n grooves 105 is an arc surface 106. This design is conducive to the elastic limiting piece 103 bending to one side under pressure, avoiding cracks on the bottom surface of the groove 105 after long-term use, thereby preventing the elastic limiting piece 103 from breaking.

[0061] Preferably, the n elastic limiting pieces 103 have the same size. In this embodiment, the first comb tooth portion 101 has four elastic limiting pieces 103 of the same size, and the length, width and height thereof are l×b×h. Figure 3A The schematic diagram shows an elastic limit block 100 of an embodiment of the present invention during a compression process. Figure 1 . Figure 3B The schematic diagram shows the elastic limit block of an embodiment of the present invention during the compression process. Figure 2 . Figure 3C Schematic diagram 3 shows the elastic limit block of an embodiment of the present invention during the compression process. Figure 3D The schematic diagram shows the elastic limit block of an embodiment of the present invention during the compression process. Figure 4 . Figure 3E Schematic diagram 5 shows the elastic limit block of an embodiment of the present invention during the compression process. FIG. 3A to FIG. 3E The diagram shows the compression process of the elastic limit block. Figure 3A, the elastic limiting block 100 is placed in a position where the first comb tooth portion 101 is above the second comb tooth portion 102. The first comb tooth portion 101 is arranged with the first elastic limiting piece 1031, the second elastic limiting piece 1032, the third elastic limiting piece 1033 and the fourth elastic limiting piece 1034 from top to bottom, and the second comb tooth portion 102 is located below the first comb tooth portion 101. The pressure F is substantially perpendicular to the length direction of the elastic limiting block 100 from top to bottom, and is close to the free end of the first elastic limiting piece 1031. Figure 3A The elastic limiting block 100 is in the initial state, and the downward pressure F does not touch the first elastic limiting piece 1031. Figure 3B , the pressure F touches the first elastic limiting piece 1031, forcing the first elastic limiting piece 1031 to bend downward, and the free end of the first elastic limiting piece 1031 touches the second elastic limiting piece 1032. Figure 3C , the pressure is continuously applied, the free ends of the first elastic limiting piece 1031 and the second elastic limiting piece 1032 are bent downward, and the free end of the second elastic limiting piece 1032 touches the third elastic limiting piece 1033. Figure 3D , continue to apply pressure, the free ends of the first elastic limiting piece 1031, the second elastic limiting piece 1032 and the third elastic limiting piece 1033 continue to move downward, and the free end of the third elastic limiting piece 1033 touches the fourth elastic limiting piece 1034. Figure 3E , continue to apply pressure, the free ends of the first elastic limiting piece 1031, the second elastic limiting piece 1032, the third elastic limiting piece 1033 and the fourth elastic limiting piece 1034 continue to move downward, and the free end of the fourth elastic limiting piece 1034 touches the rigid limiting piece 104 of the second comb tooth portion 102, and stops moving downward. It is easy to understand that during the compression process of the elastic limiting block 100, the elastic limiting piece 103 gradually increases the compression stroke, and the rigidity of the elastic limiting block 100 will continue to increase, thereby achieving a limiting effect without generating impact. This anti-impact process can absorb the energy generated by the collision of the rotating mechanism, effectively avoid the damage of the rotating mechanism and the load caused by excessive collision impact, and improve the reliability of the overall structure of the rotating mechanism.

[0062] Figure 4 The schematic diagram of the structure of a limiting device of an embodiment of the present invention is shown. As shown in the figure, the present invention also provides a limiting device 200 suitable for a rotating mechanism 300. The limiting device 200 includes a limiting block 201 and the elastic limiting block 100 mentioned above.

[0063] The limit stopper 201 is arranged on the rotating mechanism 300 and can rotate with the rotor of the rotating mechanism 300. The elastic limit block 100 is arranged on the stator of the rotating mechanism 300. The plane where the elastic limit block 100 is located is consistent with the rotation plane where the limit stopper 201 is located, and the elastic limit block 100 is used to limit the rotation of the limit stopper 201.

[0064] Preferably, the center line of the elastic limit block 100 in the length direction intersects with the rotation axis of the rotating mechanism 300. The limit block 201 can touch the end of the elastic limit piece 103, so that the pressure of the limit block 201 is substantially perpendicular to the center line of the elastic limit block 100, ensuring that each elastic limit piece 103 in the compression stroke can provide sufficient elastic potential energy.

[0065] Preferably, during the limiting process of the limit block 201 by the elastic limit block 100, the limit block 201 touches the first comb tooth portion 101. It is easy to understand that the limiting function of the elastic limit block 100 is provided by the elastic limit piece 103 of the first comb tooth portion 101. Therefore, the first comb tooth portion 101 of the elastic limit block 100 should face the rotor rotation direction of the rotating mechanism 300. As shown in the figure, two upper and lower elastic limit blocks 100 are arranged in the circumferential direction of the rotating mechanism 300. When the rotating mechanism 300 rotates clockwise along the paper surface, the limit block 201 touches the first comb tooth portion 101 of the upper elastic limit block 100; and when the rotating mechanism 300 rotates counterclockwise along the paper surface, the limit block 201 touches the first comb tooth portion 101 of the lower elastic limit block 100. As an example but not a limitation, as required, the elastic limit block 100 can move along the axial direction of the rotating mechanism 300 so that the elastic limit block 100 reaches the rotation plane of the limit block 201, thereby providing a limit function. FIG. 3A to FIG. 3E During the rotation of the rotating mechanism 300, the stopper 201 installed on the rotor of the rotating mechanism 300 first compresses the first elastic stopper 1031, and then compresses the second elastic stopper 1032, the third elastic stopper 1033 and the fourth elastic stopper 1034 in sequence. During this compression process, the rigidity of the elastic stopper 100 will continue to increase. The entire compression process is as follows: FIG. 3A to FIG. 3E As shown, the limiting effect of the limit stopper 201 is achieved without generating any impact.

[0066] Preferably, the calculation formula of the positive pressure F formed by the compression of each elastic limiting piece 103 of the first comb tooth portion 101 is:

[0067]

[0068] Wherein, n is the number of elastic limit pieces 103, ω is the deflection, the length, width and height of a single elastic limit piece 103 are l×b×h (mm×mm×mm), and E is the material elastic modulus of the elastic limit piece 103. Each elastic limit piece 103 can be regarded as a beam of equal cross-section of l×b×h (mm×mm×mm). In this example, the four elastic limit pieces 103 are of the same size. The calculation formula for the positive pressure F of the elastic limit block 100 is:

[0069]

[0070] The deflection ω is solved by the normal pressure F.

[0071] Each elastic limiting piece 103 of the first comb-tooth portion 101 is compressed to form an elastic potential energy A e The calculation formula is:

[0072]

[0073] Where K is the stiffness of the elastic limiter 103, and the elastic potential energy A is calculated based on the deflection ω. e

[0074] Kinetic energy E of the rotating mechanism 300 e The calculation formula is:

[0075]

[0076] Wherein, I is the moment of inertia of the rotor of the rotating mechanism 300 , and a is the angular acceleration of the rotor of the rotating mechanism 300 .

[0077] When A e >E e , the elastic limit block 100 can provide a limit function for the limit stopper 201. In other words, according to A e >E e The calculation results show that the energy generated by the complete compression deformation of the elastic limit block 100 is greater than the kinetic energy generated by the rotation mechanism 300 due to the flying, that is, the elastic limit block 100 can effectively play a role in limiting energy absorption. In actual engineering applications, the specific number and size of the elastic limit pieces 103 can be selected according to the size of the energy generated by the rotating mechanism 300 due to the flying.

[0078] The present invention provides a limit device and an elastic limit block thereof, which provide elastic potential energy after material compression through a comb tooth structure, can effectively avoid damage to the rotating mechanism and load caused by excessive collision impact, and has a compact overall structure, simple processing, convenient assembly, small size and high reliability.

[0079] It will be apparent to those skilled in the art that various modifications and variations may be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention covers modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.

Claims

1. An elastic limit block has a rectangular structure, and a first comb tooth portion and a second comb tooth portion are formed at one end in the length direction. The first comb tooth portion includes n elastic limit pieces arranged at intervals along the length direction, and the second comb tooth portion includes a rigid limit piece.

2. The elastic limit block according to claim 1, characterized in that: The elastic limit block is made of spring steel 65Mn.

3. The elastic limit block according to claim 1, characterized in that: N grooves are formed on the surface of the elastic limiting block, and the grooves are used to space adjacent elastic limiting pieces and to space the first comb-tooth portion and the second comb-tooth portion.

4. The elastic limit block according to claim 3, characterized in that: The n grooves have the same size.

5. The elastic limit block according to claim 3, characterized in that: The bottom surfaces of the n grooves are arc surfaces.

6. The elastic limit block according to claim 5, characterized in that: The n elastic limiting pieces have the same size.

7. A limit device, suitable for a rotating mechanism, characterized in that: The limiting device comprises a limiting block and an elastic limiting block as claimed in any one of claims 1 to 6; The limit stop is arranged on the rotating mechanism and can rotate with the rotor of the rotating mechanism. The elastic limit block is arranged on the stator of the rotating mechanism. The plane where the elastic limit block is located is consistent with the rotation plane where the limit stop is located. The elastic limit block is used to limit the rotation of the limit stop.

8. The limiting device according to claim 7, characterized in that: A center line of the elastic limiting block in the length direction intersects with the rotation axis of the rotating mechanism.

9. The limiting device according to claim 7, characterized in that: During the process of the elastic limiting block limiting the limiting block, the limiting block touches the first comb tooth portion.

10. The limiting device according to claim 9, characterized in that: The calculation formula of the positive pressure F formed by the compression of each elastic limiting piece of the first comb tooth part is: Solve the deflection ω through the normal pressure F; Each elastic limiting piece of the first comb tooth portion is compressed to form an elastic potential energy A e The calculation formula is: The kinetic energy E of the rotating mechanism e The calculation formula is: When A e >E e , the elastic limit block can provide a limiting effect on the limit stop block; Among them, n is the number of the elastic limit plates, ω is the deflection, the length, width and height of a single elastic limit plate are l×b×h, E is the elastic modulus of the material of the elastic limit plate, K is the stiffness of the elastic limit plate, I is the moment of inertia of the rotor of the rotating mechanism, and a is the angular acceleration of the rotor of the rotating mechanism.

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