Limiting mechanism

Abstract

The utility model discloses a limiting mechanism which comprises a base, a transmission seat, an elastic assembly, a crank assembly and a limiting piece. The base comprises a bearing part for bearing a product; the transmission seat is arranged on the base in a sliding manner and is positioned below the bearing part; the elastic assembly is connected between the base and the transmission seat; the crank assembly is rotationally connected with the transmission seat and the base, and moves along with the transmission seat, so that one end of the crank assembly is close to or far away from the bearing part; the limiting piece is connected with one end of the crank assembly, and the limiting piece synchronously moves along with the end of the crank assembly to be close to or away from the bearing part, so that the product at the bearing part is limited. According to the limiting mechanism, the product limiting function is achieved, the structure of the limiting mechanism is simple, the movement range of the limiting piece and the crank assembly is small, the operation space required by the limiting mechanism is small, and therefore the limiting mechanism can limit the product in a narrow space.

Description

Technical Field

[0001] The present application relates to the technical field of product limiting, and in particular to a limiting mechanism. Background Art

[0002] In actual production and processing, it is necessary to limit the position of products in order to facilitate positioning, assembly and other operations. Currently, clamping mechanisms are usually used to limit the position of products. However, due to the diversified requirements of products and processes, it is sometimes necessary to limit the position of products in a small space. Since clamping mechanisms usually have complex mechanical structures, it is impossible to limit the position of products in a small space. Utility Model Content

[0003] In view of the above, it is necessary to propose a limiting mechanism that can limit the position of the product in a narrow space through a simple mechanical structure.

[0004] The embodiment of the present application provides a limiting mechanism, including:

[0005] A base, including a bearing portion for bearing the product to be limited;

[0006] A transmission seat, slidably disposed on the base and located below the bearing portion;

[0007] An elastic component connected between the base and the transmission base;

[0008] A crank assembly is rotatably connected to the transmission seat and the base, and one end of the crank assembly extends to one side of the bearing portion. The crank assembly moves with the transmission seat to move one end of the crank assembly closer to or away from the bearing portion.

[0009] A limiting member is connected to one end of the crank assembly, and the limiting member moves synchronously with the one end of the crank assembly to approach or move away from the bearing portion, thereby limiting the product at the bearing portion.

[0010] In some embodiments, the crank assembly includes a first rod and a second rod, one end of the first rod is rotatably connected to the transmission seat, the other end of the first rod is rotatably connected to one end of the second rod, the middle part of the second rod is rotatably connected to the base, and the other end of the second rod extends to one side of the bearing portion and is connected to the limit member.

[0011] In some embodiments, the base also includes a first plate, a second plate and a support member, the first plate and the second plate are arranged opposite to each other and the first plate is located above the second plate, the support member is connected between the first plate and the second plate, and the bearing portion is connected to the side of the first plate facing away from the second plate; wherein the transmission seat is slidably arranged on the support member, the elastic component is connected between the second plate and the transmission seat, and the crank component is rotatably connected to the transmission seat and the first plate respectively.

[0012] In some embodiments, the elastic component includes a fixed rod, a sliding rod and an elastic member, one end of the fixed rod is connected to the base, the sliding rod is slidably mounted on the other end of the fixed rod, the sliding rod is connected to the transmission seat and extends toward the bearing portion, and the elastic member is movably disposed in the sliding rod and abuts against the other end of the fixed rod.

[0013] In some embodiments, the elastic component further includes an abutment member, which is connected to an end of the sliding rod facing the fixing rod and is located on a side of the transmission seat away from the bearing portion.

[0014] In some embodiments, the elastic component includes a reset member, which is connected between the base and the transmission seat and is located at a side of the transmission seat away from the bearing portion.

[0015] In some embodiments, the transmission seat includes a base plate and a connecting plate, the base plate is slidably disposed on the base, the connecting plate is slidably disposed on the base and connected to a side of the base plate facing the bearing portion, and a cross-section of the connecting plate perpendicular to the sliding direction of the transmission seat is smaller than a cross-section of the base plate perpendicular to the sliding direction of the transmission seat; wherein the elastic component is connected between the base and the base, and the crank component is rotatably connected to the connecting plate and the base, respectively.

[0016] In some embodiments, a side of the limiting member facing away from the crank assembly is an inclined surface.

[0017] In some embodiments, a contoured groove matching the product is formed on a side of the bearing portion facing away from the transmission seat.

[0018] In some embodiments, the number of the crank assemblies and the number of the limiting members are both two, wherein the two crank assemblies are symmetrically arranged, and the two limiting members are symmetrically arranged and respectively connected to one end of the corresponding crank assembly.

[0019] When the above-mentioned limiting mechanism is in use, the transmission seat is pressed in the direction away from the load-bearing part, the transmission seat compresses the elastic component and drives the crank component to move, the crank component follows the downward pressure of the transmission seat to move one end of the crank component away from the load-bearing part, and one end of the crank component drives the limiting member to move away from the load-bearing part to facilitate placing the product on the load-bearing part; after the product is placed on the load-bearing part, the force applied to the transmission seat is removed, the elastic component releases the elastic force to push the transmission seat in the direction close to the load-bearing part, the transmission seat rises and moves close to the load-bearing part to make one end of the crank component close to the load-bearing part, and one end of the crank assembly drives the limiting member to move close to the load-bearing part, so that the limiting member limits the product at the load-bearing part.

[0020] The limiting mechanism provided in the embodiment of the present application realizes the limiting function of the product through the cooperation of the base, the transmission seat, the elastic component, the crank assembly and the limiting member. The limiting mechanism has a simple structure, the movement range of the limiting member and the crank assembly is small, and the operating space required by the limiting mechanism is also small, so that the limiting mechanism can limit the product in a narrow space; in addition, since the limiting member can be moved away from the load-bearing part by applying a force to the transmission seat, and the limiting member can be moved close to the load-bearing part by removing the force applied to the transmission seat, the limiting mechanism is easy to operate, saves manpower, does not require a complex mechanical structure and a high-priced servo motor control system, saves costs, reduces costs and increases efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the limiting mechanism provided in an embodiment of the present application.

[0022] Figure 2 yes Figure 1 A schematic structural diagram of a limiting mechanism in which a limiting member is away from a bearing portion is shown.

[0023] Figure 3 It is a structural schematic diagram of another limiting mechanism provided in an embodiment of the present application.

[0024] Main component symbols

[0025] Limiting mechanism 100, 400

[0026] Base 10

[0027] Carrying part 12

[0028] Profile slot 122

[0029] First Plate 14

[0030] Second board 16

[0031] Support 18

[0032] Transmission seat 20

[0033] Substrate 22

[0034] Connecting plate 24

[0035] Elastic component 30

[0036] Fixed rod 32

[0037] Slide bar 34

[0038] Elastic member 35

[0039] Abutment 36

[0040] Reset 38

[0041] Crank assembly 40

[0042] First shot 42

[0043] Second shot 44

[0044] Limiting piece 50

[0045] Product 200

[0046] Centerline 300 DETAILED DESCRIPTION

[0047] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0048] In the description of the present application, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, it should be noted that the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0051] See also Figure 1 The embodiment of the present application provides a limiting mechanism 100, which is used to limit the position of a product 200, especially to limit the position of the product 200 in a narrow space, wherein the product 200 can be a concave mirror, a convex lens or other objects. The limiting mechanism 100 includes a base 10, a transmission base 20, an elastic component 30, a crank component 40 and a limiting member 50.

[0052] The base 10 includes a bearing portion 12 for bearing a product 200 to be limited, wherein the bearing portion 12 is adapted to bear the product 200. The transmission seat 20 is slidably disposed on the base 10 and is located below the bearing portion 12, that is, the transmission seat 20 can slide on the base 10 to approach or move away from the bearing portion 12. The elastic component 30 is connected between the base 10 and the transmission seat 20. The elastic component 30 has elasticity and can be compressed by the transmission seat 20. The elastic component 30 can also release elastic force to push the transmission seat 20. The crank assembly 40 is rotatably connected to the transmission seat 20 and the base 10 respectively, and one end of the crank assembly 40 extends to one side of the bearing portion 12. When the transmission seat 20 slides on the base 10 to approach or move away from the bearing portion 12, the crank assembly 40 moves with the transmission seat 20 so that one end of the crank assembly 40 approaches or moves away from the bearing portion 12. The limiting member 50 is connected to one end of the crank assembly 40, and the limiting member 50 moves synchronously with the one end of the crank assembly 40 to approach or move away from the bearing portion 12, thereby limiting the position of the product 200 at the bearing portion 12. A contoured groove 122 adapted to the product 200 is provided on one side of the bearing portion 12 away from the transmission seat 20.

[0053] Please refer to Figure 2 ,in Figure 1 The diagram shown is a schematic diagram of the limiting member 50 approaching the carrying portion 12 to limit the product 200. Figure 2 The schematic diagram shown is that the limiting member 50 is away from the load-bearing portion 12 so as to facilitate the placement of the product 200 on the load-bearing portion 12. Specifically, when the above-mentioned limiting mechanism 100 is actually used, please refer to Figure 2, the transmission seat 20 is pressed in a direction away from the load-bearing portion 12, the transmission seat 20 compresses the elastic component 30 and drives the crank component 40 to move, the crank component 40 moves with the downward pressure of the transmission seat 20 so that one end of the crank component 40 moves away from the load-bearing portion 12, and one end of the crank component 40 drives the limiting member 50 to move away from the load-bearing portion 12, so as to place the product 200 on the load-bearing portion 12; after the product 200 is placed on the load-bearing portion 12, see Figure 1 , the force applied to the transmission seat 20 is removed. Since the transmission seat 20 no longer applies force to the elastic component 30, the elastic component 30 releases its elastic force to push the transmission seat 20 toward the direction close to the load-bearing portion 12. The transmission seat 20 moves upward close to the load-bearing portion 12, causing one end of the crank assembly 40 to approach the load-bearing portion 12. One end of the crank assembly 40 drives the limiting member 50 to move close to the load-bearing portion 12, thereby causing the limiting member 50 to limit the product 200 at the load-bearing portion 12.

[0054] It can be understood that the bearing portion 12 may be circular, and accordingly, the side of the limiting member 50 abutting against the product 200 may be arc-shaped or semi-circular.

[0055] In the embodiment of the present application, the base 10 may further include a first plate 14, a second plate 16 and a support member 18. The first plate 14 and the second plate 16 have substantially the same shape. The first plate 14 and the second plate 16 are arranged opposite to each other and the first plate 14 is located above the second plate 16. The support member 18 is connected between the first plate 14 and the second plate 16. The first plate 14, the second plate 16 and the support member 18 substantially form an I-shaped structure. The bearing portion 12 is connected to the side of the first plate 14 away from the second plate 16, wherein the transmission seat 20 is slidably arranged on the support member 18 and is located between the first plate 14 and the second plate 16, the elastic component 30 is connected between the second plate 16 and the transmission seat 20, and the crank assembly 40 is rotatably connected to the transmission seat 20 and the first plate 14 of the base 10, respectively. In this way, by setting the specific structure of the above-mentioned base 10, the base 10 can realize the functions of slidingly setting the transmission seat 20, connecting with the elastic component 30 and rotating connected with the crank component 40. The structure of the base 10 is stable and well balanced, and it is not easy to deflect and tip over due to the irregular movement of the crank component 40.

[0056] In the embodiment of the present application, the transmission seat 20 may include a base plate 22 and a connecting plate 24. The base plate 22 is slidably set on the support member 18 of the base 10. The connecting plate 24 is slidably set on the support member 18 of the base 10 and is connected to the side of the base plate 22 facing the bearing portion 12. The cross-section of the connecting plate 24 perpendicular to the sliding direction of the transmission seat 20 is smaller than the cross-section of the base plate 22 perpendicular to the sliding direction of the transmission seat 20. It can also be understood that the transmission seat 20 is roughly an inverted T-shaped structure; wherein the elastic component 30 is connected between the second plate 16 of the base 10 and the base plate 22 of the transmission seat 20, and the crank component 40 is rotatably connected to the connecting plate 24 of the transmission seat 20 and the first plate 14 of the base 10 respectively. In this way, by setting the specific structure of the above-mentioned transmission base 20, which is rotatably connected to the crank assembly 40 through the connecting plate 24, the connecting plate 24 can form a pulling force and a pushing force on the crank assembly 40, so that when the crank assembly 40 moves following the transmission base 20, one end of the crank assembly 40 can be close to or away from the bearing part 12; by setting the base plate 22, the elastic component 30 can be connected between the second plate 16 and the base plate 22 and avoid the connecting plate 24.

[0057] In the embodiment of the present application, the elastic component 30 may include a fixed rod 32, a sliding rod 34 and an elastic member 35 (as shown in the dotted line portion in the figure), one end of the fixed rod 32 is connected to the second plate 16 of the base 10, the sliding rod 34 is generally a hollow structure and the diameter of the sliding rod 34 is larger than the diameter of the fixed rod 32, one end of the sliding rod 34 is slidably sleeved on the other end of the fixed rod 32, the sliding rod 34 is connected to the transmission seat 20 and the other end of the sliding rod 34 extends toward the bearing portion 12, which can also be understood as the other end of the sliding rod 34 extending toward the first plate 14, and the elastic member 35 may be a spring, which is movably arranged in the sliding rod 34 and abuts against the other end of the fixed rod 32. In this way, by setting the specific structure of the elastic component 30, an elastic connection is achieved between the base plate 22 and the second plate 16. Illustratively, when a downward force is applied to the base plate 22, the base plate 22 moves downward with the slide bar 34 and the connecting plate 24, the slide bar 34 slides along the fixed rod 32 and compresses the elastic member 35 inside the slide bar 34; when the force applied to the base plate 22 is removed, the elastic force of the elastic member 35 inside the slide bar 34 is released and drives the slide bar 34 to move upward, the slide bar 34 slides upward along the fixed rod 32 and drives the base plate 22 to move upward, and the base plate 22 drives the connecting plate 24 to move upward. At the same time, since the other end of the slide bar 34 extends toward the first plate 14, when the other end of the slide bar 34 abuts against the first plate 14, the slide bar 34 no longer moves upward, and the transmission seat 20, the crank assembly 40 and the limit member 50 no longer move, so that the limit member 50 can achieve precise movement to achieve precise limiting of the product 200, thereby avoiding excessive pressure of the limit member 50 on the product 200 at the bearing portion 12. Among them, since the other end of the slide bar 34 can abut the first plate 14, the sleeve connection between the slide bar 34 and the fixed rod 32 is simple and convenient. It can be understood that in other embodiments, a limiting structure can be provided between the slide bar 34 and the fixed rod 32 to prevent the two from separating.

[0058] Furthermore, the elastic component 30 may further include an abutment member 36, which is connected to one end of the slide bar 34 facing the fixed rod 32 and is located on the side of the base plate 22 of the transmission seat 20 away from the bearing portion 12, and the diameter of the abutment member 36 is greater than the diameter of the slide bar 34. In this way, by providing the above-mentioned abutment member 36, the base plate 22 can be driven by the abutment member 36 to move downward, and the slide bar 34 can be driven by the abutment member 36 to move upward. It can be understood that the abutment member 36 and the slide bar 34 can be integrally formed.

[0059] In the embodiment of the present application, the crank assembly 40 includes a first rod 42 and a second rod 44. One end of the first rod 42 is rotatably connected to the connecting plate 24 of the transmission seat 20, the other end of the first rod 42 is rotatably connected to one end of the second rod 44, the middle portion of the second rod 44 is rotatably connected to the first plate 14 of the base 10, and the other end of the second rod 44 extends to one side of the bearing portion 12 and is connected to the limit member 50. In this way, by setting the specific structure of the crank assembly 40, the crank assembly 40 is rotatably connected to the transmission seat 20 and the base 10 respectively. For example, when the transmission seat 20 is pressed down and moved, the transmission seat 20 drives the first rod 42 to move obliquely downward, and the first rod 42 pulls the second rod 44 obliquely downward (such as Figure 2 As shown by the middle arrow, since the second rod 44 is rotatably connected to the first plate 14, the second rod 44 rotates relative to the first plate 14, so that the other end of the second rod 44 is away from the bearing portion 12; when the transmission seat 20 moves upward, the transmission seat 20 drives the first rod 42 to move obliquely away from the connecting plate 24 (which can be understood as outward), and the first rod 42 pushes the second rod 44 outward (as shown by the middle arrow). Figure 1 As shown by the middle arrow, since the second rod 44 is rotatably connected to the first plate 14, the second rod 44 rotates relative to the first plate 14, so that the other end of the second rod 44 is close to the bearing portion 12.

[0060] In the embodiment of the present application, the side of the limit member 50 facing away from the crank assembly 40 is an inclined surface, and the limit member 50 can also be understood as a right-angled trapezoid. The cross-section of the side of the limit member 50 close to the bearing portion 12 is smaller than the side of the limit member 50 facing away from the bearing portion 12, and the limit member 50 is vertically connected to the second rod 44. In this way, by limiting the side of the limit member 50 away from the crank assembly 40 to be an inclined surface, since when the limit member 50 abuts the product 200, the limit member 50 has a tendency to move toward the load-bearing portion 12 driven by the crank assembly 40, and by limiting the cross-section of the side of the limit member 50 close to the load-bearing portion 12 to be smaller than the side of the limit member 50 away from the load-bearing portion 12, the balance of the limit member 50 is ensured, and it is prevented that the limit member 50 excessively pushes the product 200 so that the product 200 cannot be accurately placed in the contoured groove 122 of the load-bearing portion 12; in addition, when the crank assembly 40 drives the limit member 50 away from the load-bearing portion 12, by limiting the cross-section of the side of the limit member 50 close to the load-bearing portion 12 to be smaller than the side of the limit member 50 away from the load-bearing portion 12, the end of the limit member 50 away from the load-bearing portion 12 is heavier, and the limit member 50 is more easily away from the load-bearing portion 12, which is convenient for placing the product 200.

[0061] The limiting mechanism 100 provided in the embodiment of the present application realizes the limiting function of the product 200 through the cooperation of the base 10, the transmission seat 20, the elastic component 30, the crank assembly 40 and the limiting member 50. The limiting mechanism 100 has a simple structure, the movement range of the limiting member 50 and the crank assembly 40 is small, and the operating space required by the limiting mechanism 100 is also small, so that the limiting mechanism 100 can limit the product 200 in a narrow space, thereby overcoming the defect that the limiting mechanism 100 cannot be used in a narrow space. In addition, since the limiting member 50 can be moved away from the load-bearing part 12 by applying a force to the transmission seat 20, and the limiting member 50 can be moved close to the load-bearing part 12 by removing the force applied to the transmission seat 20, the limiting mechanism 100 is simple to operate, saves manpower, does not require a complex mechanical structure and a high-priced servo motor control system, saves costs, and reduces costs and increases efficiency.

[0062] See also Figure 3 , the embodiment of the present application provides another limiting mechanism 400, the limiting mechanism 400 is substantially similar to the above-mentioned limiting mechanism 100 in structure, except that: in the embodiment of the present application, in the limiting mechanism 400, the number of crank assemblies 40 and the number of limiting members 50 are both two, wherein the two crank assemblies 40 are symmetrically arranged about the center line 300 of the limiting mechanism 400, and the two limiting members 50 are symmetrically arranged about the center line 300 of the limiting mechanism 400 and are respectively connected to one end of the corresponding crank assembly 40. In addition, the elastic component 30 may include a reset member 38, the reset member 38 is connected between the base 10 and the transmission seat 20 and is located on the side of the transmission seat 20 away from the bearing portion 12, specifically, the number of the reset members 38 is two, the reset member 38 may be a spring, the two reset members 38 are symmetrically arranged about the center line 300 of the limiting mechanism 400, and each reset member 38 is connected between the second plate 16 and the base plate 22. In this way, the limiting mechanism 400 provided in the embodiment of the present application, by setting two crank assemblies 40 and two limiting members 50, is convenient for limiting the product 200 from both sides of the product 200, thereby improving the application scope of the limiting mechanism 400; by setting the elastic assembly 30 including the reset member 38, the structure of the limiting mechanism 400 is simplified, thereby reducing the cost of the limiting mechanism 400.

[0063] It can be understood that in other embodiments, in the limiting mechanism 400, the number of crank assemblies 40 and the number of limiting members 50 can also be three, wherein the three crank assemblies 40 are evenly arranged around the center line 300 of the limiting mechanism 400, the three limiting members 50 are evenly arranged around the center line 300 of the limiting mechanism 400 and are respectively connected to one end of the corresponding crank assemblies 40, and the side of the limiting member 50 abutting against the product 200 can be arc-shaped. Alternatively, in the limiting mechanism 400, the number of crank assemblies 40 and the number of limiting members 50 can also be four, wherein the four crank assemblies 40 are evenly arranged around the center line 300 of the limiting mechanism 400, the four limiting members 50 are evenly arranged around the center line 300 of the limiting mechanism 400 and are respectively connected to one end of the corresponding crank assemblies 40, and the side of the limiting member 50 abutting against the product 200 can be arc-shaped. Alternatively, in the limiting mechanism 400, the number of crank assemblies 40 and the number of limiting members 50 can also be five or more, wherein five or more crank assemblies 40 are evenly arranged around the center line 300 of the limiting mechanism 400, and five or more limiting members 50 are evenly arranged around the center line 300 of the limiting mechanism 400 and are respectively connected to one end of the corresponding crank assembly 40, and the side of the limiting member 50 abutting against the product 200 can be arc-shaped, and the embodiments of the present application will not be repeated here.

[0064] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A limiting mechanism, characterized in that: include: A base, including a bearing portion for bearing the product to be limited; A transmission seat, slidably disposed on the base and located below the bearing portion; An elastic component connected between the base and the transmission base; A crank assembly is rotatably connected to the transmission seat and the base, and one end of the crank assembly extends to one side of the bearing portion. The crank assembly moves with the transmission seat to move one end of the crank assembly closer to or away from the bearing portion. A limiting member is connected to one end of the crank assembly, and the limiting member moves synchronously with the one end of the crank assembly to approach or move away from the bearing portion, thereby limiting the product at the bearing portion.

2. The limiting mechanism according to claim 1, characterized in that: The crank assembly includes a first rod and a second rod, one end of the first rod is rotatably connected to the transmission seat, the other end of the first rod is rotatably connected to one end of the second rod, the middle part of the second rod is rotatably connected to the base, and the other end of the second rod extends to one side of the bearing portion and is connected to the limit member.

3. The limiting mechanism according to claim 1, characterized in that: The base also includes a first plate, a second plate and a support member, the first plate and the second plate are arranged opposite to each other and the first plate is located above the second plate, the support member is connected between the first plate and the second plate, and the bearing portion is connected to the side of the first plate facing away from the second plate; wherein the transmission seat is slidably arranged on the support member, the elastic component is connected between the second plate and the transmission seat, and the crank component is rotatably connected to the transmission seat and the first plate respectively.

4. The limiting mechanism according to claim 1, characterized in that: The elastic component includes a fixed rod, a sliding rod and an elastic member, one end of the fixed rod is connected to the base, the sliding rod is slidably sleeved on the other end of the fixed rod, the sliding rod is connected to the transmission seat and extends toward the bearing portion, and the elastic member is movably arranged in the sliding rod and abuts against the other end of the fixed rod.

5. The limiting mechanism according to claim 4, characterized in that: The elastic component further comprises a contact piece, which is connected to one end of the sliding rod facing the fixing rod and is located at a side of the transmission seat away from the bearing portion.

6. The limiting mechanism according to claim 1, characterized in that: The elastic component includes a reset member, which is connected between the base and the transmission seat and is located at a side of the transmission seat away from the bearing portion.

7. The limiting mechanism according to claim 1, characterized in that: The transmission seat includes a base plate and a connecting plate, the base plate is slidably set on the base, the connecting plate is slidably set on the base and connected to the side of the base plate facing the bearing part, and the cross-section of the connecting plate perpendicular to the sliding direction of the transmission seat is smaller than the cross-section of the base plate perpendicular to the sliding direction of the transmission seat; wherein the elastic component is connected between the base and the base plate, and the crank component is rotatably connected to the connecting plate and the base respectively.

8. The limiting mechanism according to claim 1, characterized in that: The side of the limiting member facing away from the crank assembly is an inclined surface.

9. The limiting mechanism according to claim 1, characterized in that: A contoured groove matching the product is formed on one side of the bearing portion away from the transmission seat.

10. The limiting mechanism according to claim 1, characterized in that: The number of the crank assemblies and the number of the limiting members are both two, wherein the two crank assemblies are symmetrically arranged, and the two limiting members are symmetrically arranged and respectively connected to one end of the corresponding crank assembly.

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