Non-return mechanism and conveying device

Abstract

The utility model provides a non-return mechanism and a conveying device, and belongs to the technical field of mechanical mechanisms. The non-return mechanism has a first direction, a second direction and a third direction which are perpendicular to one another. The non-return mechanism comprises a base and a non-return block; a mounting space is defined by the base; the non-return block is partially arranged in the mounting space, the non-return block is rotationally connected with the base, and the rotating axis of the non-return block is parallel to the third direction; in the second direction, a gap is formed between the gravity center of the non-return block and the rotating axis; the non-return block has a first motion state and a second motion state; when the non-return block is in the first motion state, the side, away from the base, of the non-return block is perpendicular to the first direction in the first direction. When the non-return block is in the second motion state, one end of the non-return block in the first direction abuts against the base, and at least part of the other end of the non-return block in the first direction is exposed out of the installation space. According to the non-return mechanism, the working stability and the non-return quality of the non-return mechanism can be guaranteed, and noise can be effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical mechanisms, and in particular to a non-return mechanism and a transmission device. Background Art

[0002] A check mechanism is a device or structure used to prevent a fluid or object from flowing back in its normal direction of flow.

[0003] In the related art, common non-return mechanisms mostly rely on spring force to lift the non-return block structure, which causes large noise and the risk of spring failure. In addition, if the spring deforms too many times, the elastic deformation may easily cause failure, thus affecting the function of the non-return mechanism. Utility Model Content

[0004] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide a non-return mechanism and a transmission device.

[0005] In a first aspect, the present application provides a non-return mechanism having a first direction, a second direction and a third direction perpendicular to each other, comprising:

[0006] A base, defining an installation space;

[0007] A check block, partially disposed in the installation space, the check block being rotatably connected to the base, and a rotation axis of the check block being parallel to the third direction;

[0008] Along the second direction, there is a distance between the center of gravity of the check block and the rotation axis;

[0009] The check block has a first motion state and a second motion state;

[0010] When the check block is in the first movement state, along the first direction, the side of the check block away from the base is perpendicular to the first direction;

[0011] When the check block is in the second movement state, one end of the check block along the first direction abuts against the base, and the other end of the check block along the first direction is at least partially exposed outside the installation space.

[0012] In some embodiments, the check block has a first wall surface, and when in the first motion state, the first wall surface is perpendicular to the first direction, and there is a gap between the abutting surface on the base that abuts against the check block and the check block.

[0013] In some embodiments, in the first motion state, along the first direction, the distance from the rotation axis to the first wall surface is greater than the distance from the rotation axis to the side of the base close to the first wall surface.

[0014] In some embodiments, the check block has a second wall surface and a third wall surface, the second wall surface is connected with the first wall surface to form a corner portion, and the third wall surface faces the bottom wall of the installation space;

[0015] When in the second movement state, along the first direction, the corner portion is placed outside the installation space, and the third wall surface abuts against the abutting surface.

[0016] In some embodiments, the center of gravity of the check block and the second wall surface are respectively arranged on both sides of the rotation axis.

[0017] In some embodiments, the second wall surface is provided with a limiting groove, the limiting groove penetrates the check block along the third direction, and the limiting groove is adjacent to the first wall surface.

[0018] In some embodiments, the limiting groove includes a first groove wall adjacent to the first wall surface, and the first groove wall and the first wall surface are connected to form the corner portion;

[0019] When in the second movement state, the first groove wall is perpendicular to the second direction.

[0020] In some embodiments, when the check block is in the second motion state, the distance from the center of gravity of the check block to the abutment surface is L1;

[0021] When the check block is in the first motion state, the distance from the center of gravity of the check block to the abutment surface is L2;

[0022] Among them, L1 and L2 satisfy the relationship: L1<L2.

[0023] In some embodiments, the non-return mechanism includes a rotating shaft, and along the third direction, the rotating shaft passes through the non-return block and the base, and the axis of the rotating shaft coincides with the rotation axis.

[0024] In a second aspect, the present application provides a conveying device, comprising the aforementioned non-return mechanism.

[0025] The embodiments of the present application have the following advantages: the check mechanism provided by the present application, by spacing the rotation axis of the check mechanism and the center of gravity of the check mechanism, enables the check mechanism to return to the second operating state under the action of its own gravity, thereby forming a blocking effect on the moving parts through the part of the check mechanism exposed outside the installation space, eliminating the situation in the prior art where the check mechanism is prone to failure by using a spring. The check mechanism of the present application ensures the working stability and checking quality of the check mechanism.

[0026] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, preferred embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A structural schematic diagram of a non-return mechanism provided by some embodiments of the present application from one perspective is shown;

[0029] Figure 2 A structural schematic diagram showing a first motion state of a non-return mechanism provided by some embodiments of the present application from one viewing angle;

[0030] Figure 3 A structural schematic diagram from one perspective of a second motion state of a non-return mechanism provided in some embodiments of the present application is shown.

[0031] Description of main component symbols:

[0032] 100 - base; 110 - installation space; 120 - abutment surface; 200 - check block; 210 - first wall surface; 220 - second wall surface; 230 - third wall surface; 240 - limiting groove; 241 - first groove wall; 250 - corner portion; 300 - rotating shaft.

[0033] Z-first direction; X-second direction; Y-third direction. DETAILED DESCRIPTION

[0034] 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.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 or an electrical connection; 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.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the template are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0039] In the related art, the reset of the non-return component in the common non-return mechanism is basically performed under the elastic force of the spring. The inventor has found that the non-return component will collide during the reset process under the elastic force of the spring, thereby generating a large noise; and the spring is prone to insufficient elastic force or even failure after multiple elastic deformations, resulting in the non-return mechanism being unable to achieve an effective non-return function. Based on this, in order to solve the above problems, the present application proposes the following technical solutions:

[0040] like Figures 1 to 3 As shown, some embodiments of the present application provide a check mechanism, which is mainly used in a conveying device to ensure the smoothness of the moving parts in the conveying direction on the conveying device, and provide limiting and blocking effects on the moving parts on the conveying device in the direction opposite to the conveying direction through the check mechanism to realize the check function of the moving parts.

[0041] The non-return mechanism has a first direction Z, a second direction X and a third direction Y which are perpendicular to each other. The non-return mechanism includes a base 100 and a non-return block 200 .

[0042] The base 100 defines an installation space 110. Specifically, along the first direction Z, one side of the base 100 defines the installation space 110, and the installation space 110 at least runs through one side of the base 100 along the first direction Z.

[0043] It is understandable that the installation space 110 may be formed by a groove on the base 100 , or the installation space 110 may be formed by a notch on the base 100 .

[0044] In addition, the check block 200 is partially disposed in the installation space 110, the check block 200 is rotatably connected to the base 100, and the rotation axis of the check block 200 is parallel to the third direction Y, so that when the check block 200 rotates relative to the base 100, the check block 200 can at least partially rotate outside the installation space 110.

[0045] There is a gap between the center of gravity of the check block 200 and the rotation axis along the second direction X. It can be understood that, along the second direction X, if the distance between the center of gravity of the check block 200 and the rotation axis is zero, then the check block 200 remains stationary relative to the base 100; along the second direction X, if the distance between the center of gravity of the check block 200 and the rotation axis is greater than zero, then the check block 200 has a tendency to rotate along the rotation axis under the action of its own gravity, that is, the check block 200 can rotate relative to the base 100 under the action of its own gravity.

[0046] In this embodiment, the check block 200 has a first motion state and a second motion state. It should be noted that the first motion state refers to the motion state when the moving part is completely supported on the check block 200 during the process of the moving part moving along the second direction X on the check mechanism from the side where the rotation axis is close to the center of gravity of the check block 200 to the side where the rotation axis is far from the center of gravity of the check block 200.

[0047] The second motion state refers to: the motion state of the check block 200 relative to the base 100 when no external force acts on the check block 200; or the motion state when one side of the moving part abuts against the check block 200 during the process of the moving part moving on the check mechanism along the second direction X, from the side of the rotation axis away from the center of gravity of the check block 200 to the side of the rotation axis close to the center of gravity of the check block 200.

[0048] When the check block 200 is in the first motion state, along the first direction Z, the side of the check block 200 away from the base 100 is perpendicular to the first direction Z. It can be understood that at this time, the side of the check block 200 away from the base 100 is in a horizontal state, so that the moving part can move along the second direction X from the side where the rotation axis is close to the center of gravity of the check block 200 to the side where the rotation axis is away from the center of gravity of the check block 200 through the side of the check block 200 away from the base 100, so as to ensure the smoothness of the moving part during movement.

[0049] In addition, when the check block 200 is in the second movement state, one end of the check block 200 along the first direction Z abuts against the base 100, and the other end of the check block 200 along the first direction Z is at least partially exposed outside the installation space 110, so as to provide a limiting effect on the moving part through the part of the check block 200 exposed outside the installation space 110, thereby realizing a checking effect on the moving part.

[0050] Specifically, the base 100 can block and limit the check block 200 to prevent the check block 200 from continuing to rotate in the direction from the first motion state to the second motion state. Since the check block 200 is in contact with the base 100, that is, when the check block 200 is in the second motion state, the check block 200 can block the moving part to prevent the moving part from moving along the second direction X from the side close to the rotation axis of the check block 200 to the side of the center of gravity of the check block 200, thereby realizing the non-return effect on the moving part.

[0051] When the check block 200 is in the second motion state, although the check block 200 is in contact with the base 100, the check block 200 can still rotate in the direction from the second motion state to the first motion state under the action of external force, and can rotate to the first motion state. That is to say, at this time, the moving part can still pass through the side of the check block 200 away from the base 100 along the second direction X from the side close to the center of gravity of the check block 200 to the side of the rotation axis, so that when the check block 200 is in the second motion state, the moving part can still pass through the check mechanism along the preset direction. It can be understood that when the check block 200 is in the second motion state, it can not only limit and check the moving part, but also ensure that the moving part can move along the second direction X from the side close to the center of gravity of the check block 200 to the side of the rotation axis, so as to ensure the smoothness of the moving part during movement.

[0052] When the moving part passes through the check block 200 away from the side of the base 100 along the second direction X, the check block 200 gradually rotates from the second motion state to the first motion state. When the moving part completely passes through the check block 200 away from the side of the base 100, the check block 200 is in the first motion state. It should be noted that when the moving part is detached from the check block 200, at this time, no external force acts on the check block 200, and the check block 200 has a tendency to rotate from the first motion state to the second motion state under the action of its own gravity. In other words, the check block 200 rotates along the rotation axis under the action of its own gravity, and rotates from the first motion state to the second motion state to form a check effect on the moving part.

[0053] like Figure 2 and Figure 3 As shown, in some embodiments of the present application, the check block 200 has a first wall 210. When the check block 200 is in the first motion state, the first wall 210 is perpendicular to the first direction Z so that the moving part can pass through the first wall 210 along the second direction X.

[0054] Specifically, in the first movement state, there is a gap between the abutting surface 120 on the base 100 that abuts against the check block 200 and the check block 200, thereby forming a clearance space between the abutting surface 120 and the check block 200, so that the check block 200 can rotate a preset angle relative to the base 100.

[0055] It should be noted that the preset angle mentioned here refers to the angle at which the check block 200 rotates when the check block 200 rotates from the first motion state to the second motion state.

[0056] It can be understood that when the check block 200 rotates by a preset angle relative to the base 100, the check block 200 rotates from the first motion state to the second motion state, or the check block 200 rotates from the second motion state to the first motion state. In the second motion state, the check block 200 abuts against the abutting surface 120 of the base 100 along the first direction Z toward the side of the base 100, so that the abutting surface 120 provides support and limit to the check block 200, thereby ensuring the stability of the check block 200 in the second motion state.

[0057] Furthermore, in some embodiments, the abutment surface 120 is an inclined surface of the base 100 along the first direction Z toward the check block 200, and the abutment surface 120 is located on the side of the rotation axis close to the center of gravity of the check block 200, so that when the check block 200 rotates from the first motion state to the second motion state, the abutment surface 120 abuts against the side of the check block 200 along the first direction Z toward the base 100, and the abutment surface 120 is completely fitted with the side of the check block 200 along the first direction Z toward the base 100, so as to improve the limiting and blocking quality of the check block 200.

[0058] like Figure 2 As shown, in some embodiments of the present application, when the check block 200 is in the first motion state, along the first direction Z, the distance from the rotation axis to the first wall 210 is greater than the distance from the rotation axis to the side of the base 100 close to the first wall 210. That is, along the first direction Z, the height of the first wall 210 is higher than the height of the base 100, so that when the moving part passes through the side of the base 100 facing the first wall 210 along the second direction X, the moving part first contacts the side of the base 100 facing the first wall 210, and gradually contacts the first wall 210 during the movement.

[0059] Specifically, in the process of the moving component moving from the side close to the center of gravity of the check block 200 to the side away from the center of gravity of the check block 200 along the second direction X, the moving component abuts against the first wall 210 and pushes the check block 200 to rotate from the first motion state to the second motion state. When the check block 200 is in the second motion state, the side of the moving component facing the base 100 is completely in contact with the first wall 210, so that the check block 200 provides support for the moving component. At this time, there is a gap between the side of the moving component facing the base 100 and the base 100, thereby reducing the friction between the moving component and the base 100 and improving the smoothness of the moving component in the process of moving along the second direction X.

[0060] like Figure 2 and Figure 3 As shown, in some embodiments of the present application, the check block 200 has a second wall 220 and a third wall 230 , the second wall 220 is connected to the first wall 210 to form a corner portion 250 , and the third wall 230 faces the bottom wall of the installation space 110 .

[0061] It should be noted that when the check block 200 is in the second motion state, the third wall 230 abuts against the abutment surface 120 of the base 100 to form a limiting abutment structure, that is, the third wall 230 provides support for the check block 200 to prevent the check block 200 from continuing to rotate in the direction from the first motion state to the second motion state.

[0062] Specifically, when the check block 200 is in the second motion state, along the first direction Z, the corner portion 250 is located outside the installation space 110, and the third wall surface 230 abuts against the abutting surface 120, so that the check block 200 is limited by the third wall surface 230. It can be understood that, at this time, a part of the corner portion 250 is located outside the installation space 110, and the corner portion 250 forms a limiting check on the moving component. That is to say, since the third wall 230 abuts against the abutment surface 120, if the moving component moves on the check mechanism along the second direction X, from the side of the rotation axis away from the center of gravity of the check block 200 to the side of the rotation axis close to the center of gravity of the check block 200, the moving component can abut against the corner portion 250. At this time, the moving component has a thrust in the second direction on the corner portion 250, so that the check block 200 has a rotation tendency from the first motion state to the second motion state under the action of the thrust. At this time, the abutment surface 120 forms an abutment and limiting effect on the check block 200, preventing the check block 200 from continuing to rotate, thereby achieving a non-return effect on the moving component.

[0063] like Figure 2 and Figure 3 As shown, in some embodiments of the present application, the second wall 220 is provided with a limiting groove 240, and the limiting groove 240 passes through the check block 200 along the third direction Y, and the limiting groove 240 is adjacent to the first wall 210, so as to provide a giving way effect to the moving part through the limiting groove 240, so that when the moving part moves along the second direction X from the side close to the rotation axis 300 line to the side close to the center of gravity of the check block 200, a part of the moving part can be stuck in the limiting groove 240, and the groove wall of the limiting groove 240 forms a blocking and limiting effect on the moving part, thereby forming a non-return effect on the moving part.

[0064] Specifically, in this embodiment, along the third direction Y, the limiting groove 240 passes through the non-return block 200 so that a part of the moving component can be completely stuck in the limiting groove 240, thereby forming a non-return effect on the moving component through the groove wall of the limiting groove 240.

[0065] like Figure 3 As shown, in some embodiments of the present application, the limiting groove 240 includes a first groove wall 241 adjacent to the first wall surface 210, and the first groove wall 241 is connected to the first wall surface 210 to form the corner portion 250, so as to limit and block the moving parts through the corner portion 250.

[0066] Specifically, when the check block 200 is in the second motion state, the first groove wall 241 is perpendicular to the second direction X, so as to provide a limiting and blocking effect on the moving component through the second groove wall. It should be noted that when the moving component moves along the second direction X from the side close to the rotation axis to the side close to the center of gravity of the check block 200, the first groove wall 241 can abut against the moving component to form a non-return effect on the moving component.

[0067] It can be understood that by making the first groove wall 241 perpendicular to the second direction X to increase the contact surface between the first groove wall 241 and the moving part, the blocking quality of the first groove wall 241 on the moving part is improved, and the stopping quality of the check block 200 on the moving part is improved.

[0068] like Figure 2 As shown, in some embodiments of the present application, the center of gravity of the check block 200 and the second wall 220 are respectively arranged on both sides of the rotation axis, so that when the check block 200 rotates along the rotation axis under the action of its own gravity, the second wall 220 can be partially rotated outside the installation space 110, thereby forming a blocking and limiting effect on the moving parts through the second wall 220, that is, a check effect is formed on the moving parts through the second wall 220.

[0069] like Figure 3 As shown, in some embodiments of the present application, when the check block 200 is in the second motion state, along the second direction, the distance between the center of gravity of the check block 200 and the rotation axis is L, and the value range of L is L≤3mm.

[0070] It can be understood that when 0<L≤3mm, at this time, the check block 200 tends to rotate from the first motion state to the second motion state under the action of its own gravity, that is, the third wall 230 exerts pressure on the abutment surface 120, so that the check block 200 can maintain the stability of the second motion state.

[0071] When L=0, at this time, in the first direction Z, the rotation axis covers the center of gravity of the check block 200. That is, at this time, the check block 200 remains stationary relative to the base 100 under the action of its own gravity, that is, the check block 200 has no tendency to rotate relative to the base 100, and the third wall surface 230 is in contact with the abutting surface 120.

[0072] In addition, if Figure 2 As shown, when the check block 200 is in the first motion state, along the second direction, the distance between the center of gravity of the check block 200 and the rotation axis is L′, wherein the value range of L′ is 3mm<L′≤5.57mm.

[0073] Further, when the check block 200 is in the second motion state, the distance from the center of gravity of the check block 200 to the abutting surface 120 is L1, and when the check block 200 is in the first motion state, the distance from the center of gravity of the check block 200 to the abutting surface 120 is L2. Among them, the relationship between L1 and L2 is satisfied, L1<L2. Specifically, the value range of L1 is 8.35mm≤L1≤8.65mm, and the value range of L2 is 13.19mm≤L2≤13.31mm.

[0074] It can be understood that, along the first direction Z, there is a gap between the rotation axis and the center of gravity of the check block 200. Therefore, by making L1<L2, in the first direction Z, the height of the center of gravity of the check block 200 in the first motion state is greater than the height of the center of gravity of the check block 200 in the second motion state, so that the check block 200 can rotate from the first motion state to the second motion state under the action of its own gravity.

[0075] That is to say, the check block 200 always has a tendency to rotate from the first motion state to the second motion state under the action of its own gravity, thereby ensuring the smoothness and stability of the rotation of the check block 200 under the action of its own gravity.

[0076] like Figure 2 and Figure 3 As shown, in some embodiments of the present application, the check mechanism includes a rotating shaft 300, and along the third direction Y, the rotating shaft 300 passes through the check block 200 and the base 100, and the axis of the rotating shaft 300 coincides with the rotation axis, so that the check block 200 is connected to the base 100 through the rotating shaft 300.

[0077] In some embodiments, the check block 200 is fixedly connected to the rotating shaft 300, and the rotating shaft 300 is rotatably connected to the base 100, so that when the check block 200 rotates relative to the base 100, the rotating shaft 300 can be driven to rotate synchronously with the check block 200.

[0078] In other embodiments, the check block 200 is rotatably connected to the rotating shaft 300, and the rotating shaft 300 is fixedly connected to the base 100, so that when the check block 200 rotates relative to the base 100, the rotating shaft 300 remains stationary relative to the base 100.

[0079] It can be understood that the check mechanism provided in the present application relies on the weight of the check block 200 itself to achieve the lifting of the check block 200, thereby preventing the rebound of the moving part after stopping, thereby ensuring the stability and smoothness of the moving part during movement in the preset direction of movement.

[0080] Other embodiments of the present application provide a conveying device, which includes the aforementioned non-return mechanism.

[0081] Specifically, the conveying device includes a roller transmission mechanism, and a check mechanism is arranged at the starting end of the roller transmission mechanism to prevent the moving part from moving in the opposite direction of the transmission direction of the roller transmission mechanism through the check mechanism. It can be understood that after the moving part passes through the check mechanism, the check block 200 in the check mechanism rotates to the second movement state under the action of its own gravity, and abuts against the moving part through the check block 200 to prevent the moving part from moving in the opposite direction, thereby ensuring the stability and smoothness of the movement of the moving part on the roller transmission mechanism.

[0082] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0083] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0084] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A non-return mechanism having a first direction (Z), a second direction (X) and a third direction (Y) which are perpendicular to each other, characterized in that: include: A base (100) defines an installation space (110); a check block (200), partially disposed in the installation space (110), the check block (200) being rotatably connected to the base (100), and a rotation axis of the check block (200) being parallel to the third direction (Y); Along the second direction (X), there is a gap between the center of gravity of the check block (200) and the rotation axis; The check block (200) has a first motion state and a second motion state; When the check block (200) is in the first motion state, along the first direction (Z), a side of the check block (200) facing away from the base (100) is perpendicular to the first direction (Z); When the check block (200) is in the second movement state, one end of the check block (200) along the first direction (Z) abuts against the base (100), and the other end of the check block (200) along the first direction (Z) is at least partially exposed outside the installation space (110).

2. The non-return mechanism according to claim 1, characterized in that: The check block (200) has a first wall surface (210). When in the first motion state, the first wall surface (210) is perpendicular to the first direction (Z), and a gap is formed between the abutting surface (120) on the base (100) abutting against the check block (200) and the check block (200).

3. The non-return mechanism according to claim 2, characterized in that: When in the first motion state, along the first direction (Z), the distance from the rotation axis to the first wall surface (210) is greater than the distance from the rotation axis to the side of the base (100) close to the first wall surface (210).

4. The non-return mechanism according to claim 2, characterized in that: The check block (200) has a second wall surface (220) and a third wall surface (230), the second wall surface (220) is connected to the first wall surface (210) to form a corner portion (250), and the third wall surface (230) faces the bottom wall of the installation space (110); When in the second motion state, along the first direction (Z), the corner portion (250) is placed outside the installation space (110), and the third wall surface (230) abuts against the abutment surface (120).

5. The non-return mechanism according to claim 4, characterized in that: The center of gravity of the check block (200) and the second wall surface (220) are respectively arranged on both sides of the rotation axis.

6. The non-return mechanism according to claim 4, characterized in that: The second wall surface (220) is provided with a limiting groove (240), the limiting groove (240) passes through the non-return block (200) along the third direction (Y), and the limiting groove (240) is adjacent to the first wall surface (210).

7. The non-return mechanism according to claim 6, characterized in that: The limiting groove (240) comprises a first groove wall (241) adjacent to the first wall surface (210), and the first groove wall (241) is connected to the first wall surface (210) to form the corner portion (250); When in the second motion state, the first groove wall (241) is perpendicular to the second direction (X).

8. The non-return mechanism according to any one of claims 2 to 7, characterized in that: When the check block (200) is in the second motion state, the distance from the center of gravity of the check block (200) to the abutment surface (120) is L1; When the check block (200) is in the first motion state, the distance from the center of gravity of the check block (200) to the abutment surface (120) is L2; Among them, L1 and L2 satisfy the relationship: L1<L2.

9. The non-return mechanism according to any one of claims 1 to 7, characterized in that: The non-return mechanism comprises a rotating shaft (300), and along the third direction (Y), the rotating shaft (300) passes through the non-return block (200) and the base (100), and the axis of the rotating shaft (300) coincides with the rotation axis.

10. A conveying device, characterized in that: The invention comprises the non-return mechanism according to any one of claims 1 to 9.

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