Lifting mechanism and automatic weighing equipment

Abstract

The utility model relates to the technical field of weighing equipment, and provides a lifting mechanism and automatic weighing equipment, the lifting mechanism comprises a bearing main body, a lifting support and a driving assembly, the lifting support is suitable for installing a main body to be lifted, and one side, facing the bearing main body, of the lifting support is provided with a track part; the driving assembly comprises a driving part and a driven part, the driven part is arranged at the driving end of the driving part, and the driven part is movably matched with the bearing body and the track part; the driving component is suitable for driving the driven component to do reciprocating motion along a straight line so that the lifting support can do lifting motion, and therefore the to-be-lifted body is driven to do lifting motion synchronously. In the moving process, all gravity of equipment is borne by the bearing body, acting force borne by the driving component is component force of all the gravity of the equipment, stability and reliability of the driving component are good, and the risk of slipping or falling does not exist.

Description

Technical Field

[0001] The utility model relates to the technical field of weighing equipment, in particular to a lifting mechanism and automatic weighing equipment. Background Art

[0002] In automated production or measurement equipment, lifting mechanisms are often used for intermittent operation. In the related art, the lifting mechanism uses a linear drive (such as a cylinder) to drive the lifting and lowering. All the gravity of the lifting body to be lifted by the lifting mechanism is borne by the linear drive. When the linear drive drives the lifting bracket to perform lifting and lowering movements, the stability is poor and there is a risk of slipping or falling. For this reason, the present application urgently needs to provide a new type of lifting mechanism. Utility Model Content

[0003] The first aspect of the utility model provides a lifting mechanism to solve the above-mentioned technical defects in the prior art. The driving components have better stability and reliability, and there is no risk of slipping or falling. At the same time, the performance requirements for the driving components are lower, and the service life of the driving components is longer.

[0004] A second aspect of the utility model provides an automatic weighing device.

[0005] The first aspect of the utility model provides a lifting mechanism, comprising:

[0006] Bearing body;

[0007] A lifting bracket, suitable for installing a body to be lifted, wherein a track portion is provided on a side of the lifting bracket facing the bearing body;

[0008] The driving assembly comprises a driving component and a driven component, wherein the driven component is arranged at the driving end of the driving component, and the driven component is movably cooperated with the bearing body and the track part respectively; the driving component is suitable for driving the driven component to reciprocate along a straight line, so that the lifting bracket can be lifted and lowered, thereby driving the body to be lifted to be lifted and lowered synchronously.

[0009] According to the lifting mechanism provided by the utility model, the track portion includes a first track surface and a second track surface connected to each other, and the distance between the first track surface and the bearing body is greater than the distance between the second track surface and the bearing body;

[0010] When the driven component contacts the first track surface, the lifting bracket drives the main body to be lifted to fall to the first position;

[0011] When the driven component contacts the second track surface, the lifting bracket drives the main body to be lifted to the second position.

[0012] According to the lifting mechanism provided by the utility model, the driven component includes:

[0013] A supporting component connected to the driving component;

[0014] A rolling component is provided on the supporting component, and the rolling component and the track portion are in rolling cooperation, or the rolling component and the track portion and the bearing body are respectively in rolling cooperation.

[0015] According to the lifting mechanism provided by the utility model, the rolling component includes a first rolling component and a second rolling component, the first rolling component is rotatably arranged above the supporting component and rollingly cooperates with the lifting bracket; the second rolling component is rotatably arranged below the supporting component and rollingly cooperates with the bearing body.

[0016] According to the lifting mechanism provided by the utility model, the rolling component further includes a third rolling member, the third rolling member is arranged in a colinear manner with the second rolling member, and the third rolling member is in rolling cooperation with the bearing body;

[0017] Wherein, the connecting lines among the first rolling element, the second rolling element and the third rolling element form an isosceles triangle.

[0018] According to the lifting mechanism provided by the utility model, the support component includes a first support member and a second support member which are arranged opposite to each other;

[0019] At least one of the first support member and the second support member is connected to the driving member; the rolling member is located between the first support member and the second support member, and is connected to the first support member and the second support member respectively.

[0020] According to the lifting mechanism provided by the utility model, the lifting mechanism further includes a guide assembly, the guide assembly includes a guide rail and a slider, and the slider is slidably matched with the guide rail;

[0021] The guide rail is arranged on one of the lifting bracket and the carrying body, and the slider is arranged on the other of the lifting bracket and the carrying body.

[0022] According to the lifting mechanism provided by the utility model, the bearing body includes a bottom plate and two supporting seats arranged opposite to each other, and the two supporting seats are arranged on the bottom plate at intervals;

[0023] The guide rail or the slider is arranged on the support seat, and the driven component is movably matched with the base plate.

[0024] According to the lifting mechanism provided by the utility model, a guide groove is provided on the upper surface of the bottom plate, and the driven component is embedded in the guide groove.

[0025] A second aspect of the utility model provides an automatic weighing device, comprising a subject to be lifted and a lifting mechanism as described in any one of the above, wherein the subject to be lifted is arranged on the lifting mechanism.

[0026] The lifting mechanism provided by the utility model is provided with a load-bearing body, a lifting bracket and a driving assembly, and a track portion is provided on the side of the lifting bracket facing the load-bearing body, so that the driving assembly includes a driving component and a driven component. When the driving component drives the driven component to reciprocate along a straight line, the driven component moves along the track portion to drive the lifting bracket to perform lifting movement, and then drives the subject to be lifted to perform lifting movement synchronously. When the lifting mechanism is applied to an automatic weighing device, during the movement, all the gravity of the automatic weighing device is borne by the load-bearing body, and the force borne by the driving component is the component force of all the gravity of the automatic weighing device. The stability and reliability of the driving component are better, and there is no risk of slipping or falling. At the same time, the performance requirements for the driving component are lower, and the service life of the driving component is longer.

[0027] The automatic weighing device provided by the utility model has all the above advantages because it includes the above lifting mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a structural schematic diagram of the lifting mechanism provided by an embodiment of the utility model;

[0030] Figure 2 It is a front view of the lifting mechanism provided by the embodiment of the utility model;

[0031] Figure 3 is a cross-sectional view of a lifting mechanism provided by an embodiment of the utility model;

[0032] Figure 4 It is a structural schematic diagram of a lifting bracket in a lifting mechanism provided in an embodiment of the utility model (including a feeding tool).

[0033] Reference numerals:

[0034] 120, lifting mechanism; 121, bearing body; 1211, guide groove; 122, lifting bracket; 1221, track portion; 1221-1, first track surface; 1221-2, second track surface; 1222, first frame; 1223, second frame; 123, driving assembly; 1231, driving component; 1232, driven component; 1232-1, first support member; 1232-2, second support member; 1232-3, first rolling member; 1232-4, second rolling member; 1232-5, third rolling member; 124, guiding assembly; 1241, guide rail; 1242, slider;

[0035] 130. The main body to be lifted. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0038] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] In the description of this specification, the description with reference to the terms "some embodiments", "some embodiments", "examples", "specific examples", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least some embodiments or examples of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0040] Figure 1 It is a structural schematic diagram of the lifting mechanism 120 provided in an embodiment of the utility model; Figure 2 It is a front view of the lifting mechanism 120 provided in the embodiment of the utility model; Figure 3 It is a cross-sectional view of the lifting mechanism 120 provided in the embodiment of the present utility model.

[0041] See also Figures 1 to 3 The embodiment of the utility model provides a lifting mechanism 120, which can be used in any automated equipment. For example, the lifting mechanism 120 is used in an automatic weighing device to switch between a weighing state and a non-weighing state. The lifting mechanism 120 includes a bearing body 121, a lifting bracket 122 and a driving assembly 123.

[0042] The bearing body 121 bears the gravity of the entire automatic weighing device and is used to support the body 130 to be lifted, wherein the bearing body 121 may be a plate-shaped member with a certain thickness and width.

[0043] The lifting bracket 122 is fixedly mounted on the load-bearing body 121 by fasteners such as bolts, screws, and rivets. The lifting bracket 122 is used to install the body to be lifted 130, wherein the body to be lifted 130 can be a temporary storage platform or a feeding tool. A track portion 1221 is provided on the side of the lifting bracket 122 facing the load-bearing body 121.

[0044] The driving assembly 123 includes a driving component 1231 and a driven component 1232. The driven component 1232 is arranged at the driving end of the driving component 1231. The driven component 1232 is respectively movably matched with the track portion 1221 of the bearing body 121 and the lifting bracket 122. The driving component 1231 is a linear driving structure, such as a driving transmission mechanism such as a cylinder, a linear motor or a screw nut pair. The driving component 1231 can drive the driven component 1232 to reciprocate along a straight line, so that the driven component 1232 drives the lifting bracket 122 to move up and down, thereby driving the temporary storage platform and the feeding tooling to move up and down synchronously.

[0045] It should be noted that the driven component 1232 is movably matched with the track portion 1221 of the load-bearing body 121 and the lifting bracket 122, respectively. The driven component 1232 and the track portion 1221 of the load-bearing body 121 and the lifting bracket 122 may be slidably matched, or the driven component 1232 and the track portion 1221 of the load-bearing body 121 and the lifting bracket 122 may be rolled matched, or the driven component 1232 and one of the track portions 1221 of the load-bearing body 121 and the lifting bracket 122 may be slidably matched, and the driven component 1232 and the other of the track portions 1221 of the load-bearing body 121 and the lifting bracket 122 may be slidably matched. The specific setting can be set according to actual use requirements.

[0046] It is understandable that the lifting mechanism 120 provided in the embodiment of the utility model can be directly replaced by a linear drive structure installed on the bearing body 121, but in this arrangement, all the gravity of the automatic weighing equipment is borne by the linear drive structure. When the linear drive structure drives the lifting bracket 122 to perform lifting movement, the stability is poor and there is a risk of slipping or falling. The lifting mechanism 120 provided in the embodiment of the present application is provided with a bearing body 121, a lifting bracket 122 and a driving assembly 123, and a track portion 1221 is provided on the side of the lifting bracket 122 facing the bearing body 121, so that the driving assembly 123 includes a driving component 1231 and a driven component 1232. When the driving component 1231 drives the driven component 1232 to reciprocate along a straight line, the driven component 1232 moves along the track portion 1221 to drive the lifting bracket 122 to perform lifting movement, thereby driving the lifting body 130 to be lifted to perform lifting movement synchronously. When the lifting mechanism 120 is applied to an automatic weighing device, during the movement, all the gravity of the automatic weighing device is borne by the bearing body 121, and the force borne by the driving component 1231 is the component force of all the gravity of the automatic weighing device. The driving component 1231 has better stability and reliability, and there is no risk of slipping or falling. At the same time, the performance requirements for the driving component 1231 are low, and the service life of the driving component 1231 is longer.

[0047] See also Figures 1 to 3 In some embodiments of the present invention, the track portion 1221 includes a first track surface 1221 - 1 and a second track surface 1221 - 2 connected to each other, and the distance between the first track surface 1221 - 1 and the carrier body 121 is greater than the distance between the second track surface 1221 - 2 and the carrier body 121 .

[0048] Equivalently, the track portion 1221 is a groove structure formed by the bottom wall of the lifting bracket 122 being recessed upward, the first track surface 1221-1 is equivalent to the inner wall of the groove, and the second track surface 1221-2 is equivalent to the bottom wall of the lifting bracket 122, or a plane parallel to the bottom wall of the lifting bracket 122.

[0049] When the driven component 1232 contacts the first track surface 1221 - 1 , it is equivalent to that the lifting bracket 122 drives the main body 130 to be lifted to fall to the first position, and the first position is the lowest position of the main body 130 to be lifted.

[0050] When the driven component 1232 contacts the second track surface 1221 - 2 , it is equivalent to that the lifting bracket 122 drives the main body 130 to be lifted to the second position, and the second position is the highest position of the main body 130 to be lifted.

[0051] In addition, in order to make the driven component 1232 smoothly transition between the first track surface 1221 - 1 and the second track surface 1221 - 2 , an inclined surface or an arc-shaped transition surface is provided between the first track surface 1221 - 1 and the second track surface 1221 - 2 .

[0052] In addition, in order to limit the movement position of the driven component 1232, a first limiting surface (not numbered in the figure) is provided on one side of the first track surface 1221-1, and a second limiting surface (not numbered in the figure) is provided on one side of the second track surface 1221-2. When the driven component 1232 switches from the second track surface 1221-2 to the first track surface 1221-1, the first limiting surface limits the movement position of the driven component 1232, and when the driven component 1232 switches from the first track surface 1221-1 to the second track surface 1221-2, the second limiting surface limits the position of the driven component 1232, thereby preventing the driven component 1232 from over-travel operation, and further improving the operation stability of the driven component 1232.

[0053] Continue reading Figures 1 to 3 In some embodiments of the present invention, the driven component 1232 includes a supporting component and a rolling component, the supporting component is connected to the driving end of the driving component 1231, and mainly performs linear reciprocating motion with the driving component 1231. The rolling component is installed on the supporting component through a roller, and the rolling component and the lifting bracket 122 are rollingly matched.

[0054] In the embodiment of the utility model, a rolling component is arranged on the supporting component so that the rolling component and the lifting bracket 122 are in rolling cooperation. Compared with the sliding cooperation between the driven component 1232 and the supporting bracket, this method can convert the sliding friction between the driven component 1232 and the supporting bracket into rolling friction, thereby reducing the friction between the driven component 1232 and the supporting bracket, so as to reduce the driving force of the driving component 1231.

[0055] It should be noted that when the driven component 1232 rolls with the lifting bracket 122 through the rolling component, the supporting component of the driven component 1232 can slide with the supporting body 121; or the volume of the rolling component is set to be larger so that the rolling component can roll with both the lifting bracket 122 and the supporting body 121.

[0056] Continue reading Figures 1 to 3 In some embodiments of the utility model, the rolling component includes a first rolling component 1232-3 and a second rolling component 1232-4. The first rolling component 1232-3 is arranged above the supporting component and rollingly cooperates with the lifting bracket 122; the second rolling component 1232-4 is rotatably arranged below the supporting component and rollingly cooperates with the bearing body 121.

[0057] In other words, the rolling component is composed of two symmetrically arranged rolling elements, one of which is arranged above the supporting component and rolls with the lifting bracket 122. The other rolling element is arranged below the supporting component and rolls with the bearing body 121. The driven component 1232 is respectively matched with the lifting bracket 122 and the bearing body 121 in a rolling friction manner, which can reduce the friction between the driven component 1232 and the lifting bracket 122 and the bearing body 121, and reduce the driving requirements for the driving component 1231.

[0058] Continue reading Figures 1 to 3 In some embodiments of the utility model, the rolling component also includes a third rolling element 1232-5, the third rolling element 1232-5 and the second rolling element 1232-4 are arranged in a colinear manner, and the third rolling element 1232-5 rolls with the supporting body 121; wherein the connecting line between the first rolling element 1232-3, the second rolling element 1232-4 and the third rolling element 1232-5 forms an isosceles triangle.

[0059] In the embodiment of the utility model, the connecting lines between the first rolling element 1232-3, the second rolling element 1232-4 and the third rolling element 1232-5 form an isosceles triangle, and the principle of the stability of the triangle is adopted to further improve the support function and stability of the driven component 1232.

[0060] It should be noted that the first rolling member 1232-3, the second rolling member 1232-4 and the third rolling member 1232-5 can be rollers or transmission components such as bearings. Any structure that can achieve rolling contact between the driven component 1232 and the upper and lower contact surfaces is acceptable.

[0061] Continue reading Figures 1 to 3In some embodiments of the utility model, the supporting component includes a first supporting member 1232-1 and a second supporting member 1232-2 which are arranged opposite to each other, and at least one of the first supporting member 1232-1 and the second supporting member 1232-2 is connected to the driving component 1231; the rolling component is located between the first supporting member 1232-1 and the second supporting member 1232-2, and the rolling component is respectively connected to the first supporting member 1232-1 and the second supporting member 1232-2 through a rotating shaft.

[0062] Among them, the first support member 1232-1 and the second support member 1232-2 are clamped on both sides of the lifting bracket 122, so that the lifting bracket 122 provides guidance and limiting functions for the supporting components, avoiding shaking or jamming of the driven component 1232 when moving with the driving component 1231, and further improving the stability of the operation of the driven component 1232.

[0063] Continue reading Figures 1 to 3 In some embodiments of the present utility model, the lifting mechanism 120 further includes a guide assembly 124, the guide assembly 124 includes a guide rail 1241 and a slider 1242, and the slider 1242 is slidably matched with the guide rail 1241;

[0064] The guide rail 1241 is disposed on one of the lifting bracket 122 and the carrying body 121 , and the slider 1242 is disposed on the other of the lifting bracket 122 and the carrying body 121 .

[0065] That is, a guide rail 1241 can be provided on the lifting bracket 122, and a slider 1242 can be provided on the bearing body 121. The lifting bracket 122 and the bearing body 121 can be guided and limited by the cooperation between the guide rail 1241 and the slider 1242, which can further improve the operation stability of the driven component 1232.

[0066] Figure 4 It is a structural schematic diagram of the lifting bracket 122 in the automatic weighing device provided in an embodiment of the utility model (including the feeding tooling).

[0067] Continue reading Figures 1 to 3 , and also see Figure 4 In some embodiments of the present utility model, the lifting bracket 122 includes a first frame 1222 and a second frame 1223 connected to each other, the first frame 1222 and the second frame 1223 are staggered, and the driving assembly 123 cooperates with the first frame 1222;

[0068] The temporary storage platform is arranged on the first frame 1222, and the feeding tooling is arranged on the second frame 1223; the first frame 1222 moves up and down along with the driving assembly 123 to synchronously drive the temporary storage platform and the feeding tooling to move up and down.

[0069] The first frame 1222 includes a support body and a guide frame, the guide frame is fixedly connected to the support body, the temporary storage platform is arranged on the support body, and the first track surface 1221-1 and the second track surface 1221-2 are arranged on the side of the guide frame facing the bearing body 121. The first frame 1222 is composed of the support body and the guide frame, which facilitates the processing of the components of the support body and the guide frame.

[0070] Continue reading Figure 1 In some embodiments of the utility model, the supporting body 121 includes a base plate and two support seats arranged opposite to each other, the two support seats are arranged on the base plate at an interval, the guide rail 1241 or the slider 1242 is arranged on the support seat, and a guide groove 1211 is opened on the upper surface of the base plate, and the driven component 1232 is embedded in the guide groove 1211.

[0071] When the driven component 1232 performs linear reciprocating motion with the driving component 1231, the degree of freedom of the driven component 1232 in the up and down directions is respectively limited by the lifting bracket 122 and the supported body 121, the degree of freedom of the driven component 1232 in the left and right directions is limited by the cooperation of the guide rail 1241 and the slider 1242, and the degree of freedom of the driven component 1232 in the front and back directions is respectively limited by the guide groove 1211 and the clamping cooperation between the supporting component of the driven component 1232 and the lifting bracket 122. This arrangement is equivalent to limiting the degree of freedom of the driven component 1232 in the six directions of up, down, left, right, front and back, which can further improve the reliability and stability of the movement of the driven component 1232.

[0072] Among them, the support seat may include a fixing part and an installation part, the fixing part and the installation part are arranged vertically to each other, the fixing part is fixed to the base plate by fasteners such as bolts and screws, and the guide rail 1241 or the slider 1242 is fixed to the installation part by fasteners such as bolts or screws.

[0073] In order to improve the structural strength of the support base, the support base also includes a reinforcing portion, which is located between the fixing portion and the mounting portion and is respectively connected to the fixing portion and the mounting portion to play a role in reinforcing the structure.

[0074] It should be noted that the support seat can be provided in an integral manner or in a split manner. When the support seat is provided in a split manner, the fixing portion, the mounting portion and the reinforcing portion are all plate-like structures.

[0075] The working process of the lifting mechanism 120 provided in the embodiment of the utility model is as follows:

[0076] When the driving component 1231 extends to push out the driven component 1232, the driven component 1232 moves from the first track surface 1221-1 of the lifting bracket 122 to the second track surface 1221-2, and the driven component 1232 lifts the lifting bracket 122, and the lifting bracket 122 drives the main body 130 to be lifted to lift.

[0077] When the driving component 1231 shrinks and resets, the driven component 1232 moves linearly with the driving component 1231, and the driven component 1232 moves from the second track surface 1221-2 of the lifting bracket 122 to the first track surface 1221-1, and the lifting bracket 122 falls to drive the main body 130 to fall.

[0078] It should be noted that the technical solutions in various embodiments of the present utility model can be combined with each other, but the basis for the mutual combination is that it can be implemented by ordinary technicians in the field; when the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist, that is, it does not belong to the protection scope of the present utility model.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A lifting mechanism, characterized in that: include: Bearing body; A lifting bracket, suitable for installing a body to be lifted, wherein a track portion is provided on a side of the lifting bracket facing the bearing body; The driving assembly comprises a driving component and a driven component, wherein the driven component is arranged at the driving end of the driving component, and the driven component is movably cooperated with the bearing body and the track part respectively; the driving component is suitable for driving the driven component to reciprocate along a straight line, so that the lifting bracket can be lifted and lowered, thereby driving the body to be lifted to be lifted and lowered synchronously.

2. The lifting mechanism according to claim 1, characterized in that: The track portion comprises a first track surface and a second track surface connected to each other, wherein the distance between the first track surface and the bearing body is greater than the distance between the second track surface and the bearing body; When the driven component contacts the first track surface, the lifting bracket drives the main body to be lifted to descend to the first position; When the driven component contacts the second track surface, the lifting bracket drives the main body to be lifted to the second position.

3. The lifting mechanism according to claim 2, characterized in that: The driven component comprises: A supporting component connected to the driving component; A rolling component is provided on the supporting component, and the rolling component and the track portion are in rolling cooperation, or the rolling component and the track portion and the bearing body are respectively in rolling cooperation.

4. The lifting mechanism according to claim 3, characterized in that: The rolling component includes a first rolling component and a second rolling component. The first rolling component is rotatably disposed above the supporting component and rollingly cooperates with the lifting bracket; the second rolling component is rotatably disposed below the supporting component and rollingly cooperates with the bearing body.

5. The lifting mechanism according to claim 4, characterized in that: The rolling component further includes a third rolling element, the third rolling element is arranged colinearly with the second rolling element, and the third rolling element is in rolling cooperation with the bearing body; Wherein, the connecting lines among the first rolling element, the second rolling element and the third rolling element form an isosceles triangle.

6. The lifting mechanism according to claim 3, characterized in that: The supporting member comprises a first supporting member and a second supporting member which are arranged opposite to each other; At least one of the first support member and the second support member is connected to the driving member; the rolling member is located between the first support member and the second support member, and is connected to the first support member and the second support member respectively.

7. The lifting mechanism according to any one of claims 1 to 6, characterized in that: The lifting mechanism further comprises a guide assembly, wherein the guide assembly comprises a guide rail and a slider, and the slider is slidably matched with the guide rail; The guide rail is arranged on one of the lifting bracket and the carrying body, and the slider is arranged on the other of the lifting bracket and the carrying body.

8. The lifting mechanism according to claim 7, characterized in that: The bearing body comprises a bottom plate and two supporting seats arranged opposite to each other, wherein the two supporting seats are arranged on the bottom plate at intervals; The guide rail or the slider is arranged on the support seat, and the driven component is movably matched with the base plate.

9. The lifting mechanism according to claim 8, characterized in that: A guide groove is formed on the upper surface of the bottom plate, and the driven component is embedded in the guide groove.

10. An automatic weighing device, characterized in that: It comprises a subject to be lifted and a lifting mechanism according to any one of claims 1 to 9, wherein the subject to be lifted is arranged on the lifting mechanism.

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