Lifting mechanism and automatic guided vehicle

Abstract

The invention discloses a lifting mechanism and an automatic guided vehicle. The lifting mechanism comprises a base, a power source, an output connecting rod, at least one bottom connecting rod, at least two positioning connecting rods, at least two goods jacking connecting rods and an object bearing plate. The output connecting rod is connected between the power source and the bottom connecting rod. The two positioning connecting rods are respectively provided with a first pivoting part, a second pivoting part and a third pivoting part, the first pivoting parts of the two positioning connecting rods are respectively pivoted to the two first fixing rods of the base so that the two positioning connecting rods can swing on the two first fixing rods, and the second pivoting parts of the two positioning connecting rods are respectively pivoted to the two ends of the bottom connecting rod so that the two positioning connecting rods can swing on the two first fixing rods. One ends of the two goods jacking connecting rods are connected to the goods bearing plate, and the third pivoting parts of the two positioning connecting rods are pivoted to the other ends of the two goods jacking connecting rods. The power source can drive the output connecting rod to act so as to link the bottom connecting rod to drive the two positioning connecting rods to swing and link the two goods jacking connecting rods to drive the bearing plate to ascend and descend. Therefore, the goods can be lifted only by applying small force.

Description

Technical Field

[0001] The present application relates to a lifting mechanism and an unmanned transport vehicle, and in particular to a connecting rod lifting mechanism, which can drive a load-bearing plate to rise and fall, thereby achieving the function of lifting goods. Background Art

[0002] The lifting mechanism can be installed on unmanned transport vehicles and other devices to drive the load plate to rise and fall, so as to lift the goods. Most of the existing lifting mechanisms are scissor-type (shaft joint) lifting mechanisms, so a large force must be applied to lift the goods. For example, when lifting 1000kg of goods and setting the lifting stroke to 50mm and completing the action in 6 seconds, it takes about 340~360Nm of force to lift the goods. Summary of the invention

[0003] The technical problem to be solved by the present application is to provide a lifting mechanism and an unmanned guided vehicle to address the deficiencies of the prior art. By using the lifting mechanism of the present application, goods can be lifted with only a small force.

[0004] In order to solve the above technical problems, the present application provides a lifting mechanism, comprising: a base, including a bottom plate and at least two first fixing rods, the two first fixing rods are erected on the bottom plate; a power source; an output connecting rod; at least one bottom connecting rod, the output connecting rod is connected between the power source and the bottom connecting rod; at least two positioning connecting rods, each having a first pivoting portion, a second pivoting portion and a third pivoting portion, the first pivoting portions of the two positioning connecting rods are respectively pivoted to the two first fixing rods, so that the two positioning connecting rods It can swing on the two first fixed rods, and the second pivot parts of the two positioning links are respectively pivoted to the two ends of the bottom link; at least two top cargo links; and a supporting plate, one end of the two top cargo links are respectively connected to the supporting plate, and the third pivot parts of the two positioning links are respectively pivoted to the other end of the two top cargo links; wherein the power source can drive the output link to move, so as to link the bottom link to drive at least one of the positioning links to swing, thereby linking the two top cargo links to drive the supporting plate to move up and down.

[0005] Optionally, at least one second fixing rod is erected on the bottom plate, and at least one limiting rod is arranged below the supporting plate, one end of the limiting rod is pivotally connected to one end of the second fixing rod, and the other end of the limiting rod is pivotally connected to the supporting plate.

[0006] Optionally, the bottom connecting rod is located below the two positioning connecting rods, and the two positioning connecting rods are located below the supporting plate.

[0007] Optionally, the bottom connecting rod is linear or non-linear.

[0008] Optionally, the first pivoting portion and the second pivoting portion are located on a straight line, and the third pivoting portion is located at an interval on one side of the straight line.

[0009] Optionally, a distance between the first pivoting portion and the third pivoting portion is greater than a distance between the second pivoting portion and the third pivoting portion.

[0010] Optionally, the two positioning links can swing between a first position and a second position. When the two positioning links are in the first position, the supporting plate is located at a low point, and the horizontal height of the second pivot portion is lower than the horizontal height of the first pivot portion. When the two positioning links are in the second position, the supporting plate is located at a high point, and the horizontal height of the second pivot portion is also lower than the horizontal height of the first pivot portion.

[0011] Optionally, there are two bottom connecting rods, four positioning connecting rods, four first fixing rods, and four top cargo connecting rods. The first pivot joints of the four positioning connecting rods are respectively pivoted to the four first fixing rods, the second pivot joints of the four positioning connecting rods are respectively pivoted to the two ends of the two bottom connecting rods, one end of the four top cargo connecting rods is respectively connected to the cargo supporting plate, and the third pivot joints of the four positioning connecting rods are respectively pivoted to the other end of the four top cargo connecting rods.

[0012] Optionally, the lifting mechanism further includes at least one connecting shaft, the connecting shaft is connected between the two positioning connecting rods, and the two positioning connecting rods are arranged opposite to each other.

[0013] In order to solve the above-mentioned technical problems, the present application also provides an unmanned guided vehicle, comprising the above-mentioned lifting mechanism.

[0014] The beneficial effect of the present application is that the lifting mechanism and unmanned transport vehicle provided by the present application pull the bottom connecting rod through the output connecting rod, drive the middle positioning connecting rod, and make the top connecting rod and the load-bearing plate move upward. Therefore, the force application position is different from the existing scissor-type lifting mechanism. The force application position is changed from the existing middle force application to the bottom force application, so only a small force is needed to lift the goods, so as to achieve the effect of reducing the total amount of force applied. And because the total amount of force applied is reduced, the total output force of the power source can be reduced, and the load of the power source can be reduced, so that a smaller power source can be selected to drive the lifting mechanism, so as to improve the use space of the transport vehicle and reduce the energy consumption of the transport vehicle.

[0015] To further understand the features and technical contents of the present application, please refer to the following detailed description and drawings of the present application. However, the drawings are provided for reference and illustration only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the lifting mechanism in the descending state according to the first embodiment of the present application.

[0017] Figure 2 This is a three-dimensional diagram of the lifting mechanism in the descending state of the first embodiment of the present application.

[0018] Figure 3 It is a schematic diagram of the lifting mechanism in the rising state according to the first embodiment of the present application.

[0019] Figure 4 This is a schematic diagram of the lifting mechanism in the descending state according to the second embodiment of the present application.

[0020] Figure 5 This is a schematic diagram of the lifting mechanism in the second embodiment of the present application in the rising state.

[0021] Figure 6 This is a schematic diagram of a positioning connecting rod according to the first embodiment of the present application.

[0022] Figure 7 This is a schematic diagram of a positioning connecting rod according to the second embodiment of the present application.

[0023] Figure 8 This is a schematic diagram of a positioning connecting rod according to the third embodiment of the present application.

[0024] Fig. 9 This is a schematic diagram of a positioning connecting rod according to the fourth embodiment of the present application.

[0025] Fig.10 Schematic diagram of the output connecting rod and the connecting shaft in the first embodiment of the present application.

[0026] Fig.11 Schematic diagram of the output connecting rod and the connecting shaft of the second embodiment of the present application.

[0027] Fig.12 This is a schematic diagram of the unmanned guided vehicle of this application. DETAILED DESCRIPTION

[0028] See also Figures 1 to 3 , Figure 1 This is a schematic diagram of the lifting mechanism in the descending state of the first embodiment of the present application; Figure 2 This is a three-dimensional diagram of the lifting mechanism of the first embodiment of the present application in a descending state; Figure 3 The present application provides a lifting mechanism that can be arranged on a mobile device such as an unmanned guided vehicle or a load-bearing platform to lift goods. The lifting mechanism includes a base 1, a power source 2, an output connecting rod 3, at least one bottom connecting rod 4, at least two positioning connecting rods 5, at least two cargo-lifting connecting rods 6, and a load-bearing plate 7.

[0029] The base 1 includes a bottom plate 11 and at least two first fixing rods 12, the two first fixing rods 12 are erected on the bottom plate 11, and the two first fixing rods 12 are arranged at intervals. The size and shape of the bottom plate 11 and the first fixing rods 12 can be adjusted according to the user's use requirements.

[0030] The power source 2 can be disposed at any position of the bottom plate 11 of the base 1. The power source 2 can be a drive unit such as a motor, or a combination of a drive unit such as a motor and an auxiliary drive unit such as a reducer, which is not limited in this embodiment. In a preferred embodiment, the power source 2 includes a motor and a reducer, and the motor is connected to the output connecting rod 3 through the reducer to drive the output connecting rod 3 to move.

[0031] The output connecting rod 3 is disposed between the base 1 and the object-carrying plate 7, and the output connecting rod 3 is connected between the power source 2 and the bottom connecting rod 4. Therefore, in one embodiment, one end of the output connecting rod 3 can be connected to the power source 2, and the other end can be pivotally connected to the bottom connecting rod 4 and a positioning connecting rod 5, so that the power source 2 can link the bottom connecting rod 4 and a positioning connecting rod 5 through the output connecting rod 3, and then link another positioning connecting rod 5 through the bottom connecting rod 4, so that the two positioning connecting rods 5 swing; or, in another embodiment, one end of the output connecting rod 3 can be connected to the power source 2, and the other end can be pivotally connected only to the bottom connecting rod 4, so that the power source 2 can first link the bottom connecting rod 4, and then link the two positioning connecting rods 5 through the bottom connecting rod 4, so as to drive the two positioning connecting rods 5 to swing.

[0032] The bottom connecting rod 4 is disposed between the base 1 and the support plate 7. Both ends of the bottom connecting rod 4 are pivotally connected to the positioning connecting rod 5, and one end of the bottom connecting rod 4 close to the power source 5 is pivotally connected to the output connecting rod 3. The number of the bottom connecting rod 4 is at least one, which is not limited in this embodiment. The number of the bottom connecting rod 4 can also be adjusted according to the user's usage requirements. In addition, the shape of the bottom connecting rod 4 can be linear (such as Figures 1 to 3 Further, if the shape of the bottom connecting rod 4 is non-linear, it can be V-shaped (such as Figure 4 , Figure 5 as shown) or non-linear shapes such as wavy shapes.

[0033] The two positioning links 5 are arranged between the base 1 and the object-carrying plate 7, and respectively have a first pivoting portion 51, a second pivoting portion 52 and a third pivoting portion 53. The first pivoting portions 51 of the two positioning links 5 are respectively pivoted to the two first fixing rods 12, so that the two positioning links 5 can swing on the two first fixing rods 12; the second pivoting portions 52 of the two positioning links 5 are respectively pivoted to the two ends of the bottom link 4, so that the power source 2 can drive the two positioning links 5 to swing simultaneously through the output link 3 and the bottom link 4; the third pivoting portions 53 of the two positioning links 5 are respectively pivoted to the lifting link 6. The number of the positioning links 5 is at least two, which is not limited in this embodiment, and the number of the positioning links 5 can be adjusted according to the user's usage requirements.

[0034] In addition, the shape of the positioning link 5 is not limited in this embodiment; further, the positioning link 5 can be T-shaped (such as Figure 6 As shown), V-shaped (as Figure 7 As shown), triangle or quasi-triangle (as Figure 8 As shown), round (as Fig. 9 as shown) or circular, etc.

[0035] Furthermore, the first pivoting portion 51 and the second pivoting portion 52 of the positioning link 5 are located on a straight line L (eg Figure 6 ), the third pivoting portion 53 is located at a spacing on one side of the straight line L. Preferably, the spacing P1 between the first pivoting portion 51 and the third pivoting portion 53 is greater than the spacing P2 between the second pivoting portion 52 and the third pivoting portion 53 (as shown in FIG. Figure 6 shown).

[0036] The two lifting connecting rods 6 are arranged between the base 1 and the supporting plate 7, and one end of the two lifting connecting rods 6 is respectively pivotally connected to the third pivoting parts 53 of the two positioning connecting rods 5, and the other end is respectively connected to the supporting plate 7. The size and shape of the lifting connecting rods 6 can be adjusted according to the user's use requirements and are not limited in this embodiment.

[0037] The material receiving plate 7 is arranged above the two cargo-lifting connecting rods 6 , wherein the size and shape of the material receiving plate 7 can be adjusted according to the user's usage requirements and are not limited in this embodiment.

[0038] Therefore, the power source 2 can drive the bottom connecting rod 4 to move through the output connecting rod 3, and then drive the two positioning connecting rods 5 to swing through the bottom connecting rod 4, and link the two top cargo connecting rods 6 to drive the supporting plate 7, so that the supporting plate 7 can be raised and lowered, thereby achieving the lifting and lowering of the goods.

[0039] Preferably, the bottom connecting rod 4 is located below the two positioning connecting rods 5, and the two positioning connecting rods 5 are located below the supporting plate 7, so that the supporting plate 7, the positioning connecting rods 5 and the bottom connecting rod 4 are arranged in sequence from top to bottom to form an optimized configuration.

[0040] Example

[0041] See also Figures 1 to 3 , which is the lifting mechanism of the first embodiment of the present application. The lifting mechanism of the first embodiment of the present application can move between the lowering position and the raising position, that is, the two positioning links 5 can be in the first position A (such as Figure 1 as shown) and a second position B (as shown) Figure 3 As shown in Figure 1 As shown, when the power source 2 is started, the power source 2 can drive the output link 3 to move, so as to link the bottom link 4 to drive the positioning link 5 to swing, and when the two positioning links 5 are in the first position A, the two positioning links 5 will be in a downward swinging state, thereby linking the cargo lifting link 6 to drive the cargo support plate 7 to move downward, so that the cargo support plate 7 is located at the lowest point, that is, the lifting mechanism is located in the lowered position, thereby achieving the function of lowering the cargo. Figure 3 As shown, when the power source 2 is started, the power source 2 can drive the output connecting rod 3 to move, thereby linking the bottom connecting rod 4 to drive the positioning connecting rod 5 to swing, and when the two positioning connecting rods 5 are in the second position B, the two positioning connecting rods 5 will be in an upward swinging state, thereby linking the top cargo connecting rod 6 to drive the supporting plate 7 to move upward, so that the supporting plate 7 is located at the high point, that is, the lifting mechanism is located in the rising position, thereby achieving the function of lifting the cargo.

[0042] The inventor has found through many experiments that the method for making the lifting mechanism move between the lowering and ascending positions with minimal vibration is to control the swing range of the positioning link 5, and the preferred method for controlling the swing range of the positioning link 5 is to control the swing range of the second pivoting portion 52 of the positioning link 5 to be between specific horizontal heights. Therefore, in order to prevent the lifting mechanism from vibrating violently during the process of descending and ascending, preferably, when the positioning link 5 swings between the first position A or the second position B, the horizontal height of the second pivoting portion 52 of the positioning link 5 is lower than the horizontal height of the first pivoting portion 51, thereby achieving vibration suppression during the process of lowering and ascending the goods.

[0043] In the present embodiment, in order to enhance the stability of the lifting mechanism in moving between the lowered and raised positions, the lifting mechanism further includes at least one second fixed rod 13 and at least one limit rod 8. The second fixed rod 13 is erected on the bottom plate 11, and the size and shape of the second fixed rod 13 can be adjusted according to the user's usage requirements. At least one limit rod 8 is arranged below the supporting plate 7, and the limit rod 8 is arranged between the base 1 and the supporting plate 7. Among them, one end of the limit rod 8 is pivoted to one end of the second fixed rod 13, and the other end of the limit rod 8 is pivoted to the supporting plate 7, so that the limit rod 8 can swing on the second fixed rod 13 to provide the supporting plate 7 with a limiting function, so that the supporting plate 7 can be lifted and lowered more stably. The size and shape of the limit rod 8 can be adjusted according to the user's usage requirements.

[0044] Please continue reading Figure 2 Further, in this embodiment, preferably, two bottom connecting rods 4 are provided, preferably, four positioning connecting rods 5 are provided, preferably, four first fixing rods 12 are provided, and preferably, four lifting connecting rods 6 are provided. The first pivoting parts 51 of the four positioning connecting rods 5 are respectively pivoted to the four first fixing rods 12, the second pivoting parts 52 of the four positioning connecting rods 5 are respectively pivoted to the two ends of the two bottom connecting rods 4, one end of the four lifting connecting rods 6 is respectively connected to the object-carrying plate 7, and the third pivoting parts 53 of the four positioning connecting rods 5 are respectively pivoted to the other end of the four lifting connecting rods 6. Thus, a more stable connecting rod mechanism can be formed, so that the object-carrying plate 7 can be lifted and moved more stably.

[0045] Among them, when there are two bottom connecting rods 4, four positioning connecting rods 5, four first fixing rods 12, and four lifting connecting rods 6, in order to enable the force of the output connecting rod 3 to be evenly transmitted to both sides of the lifting mechanism, at least one connecting shaft 54 ​​(such as Figure 2 The connecting shaft 54 ​​can be disposed between the second pivoting portions 52 of the two mutually oppositely disposed positioning links 5 close to the power source 2, between the third pivoting portions 53 of the two mutually oppositely disposed positioning links 5 close to the power source 2, between the second pivoting portions 52 of the two mutually oppositely disposed positioning links 5 far from the power source 2, or between the third pivoting portions 53 of the two mutually oppositely disposed positioning links 5 far from the power source 2, so as to achieve the connection function between the components of the lifting mechanism; that is, according to user needs, the number of the connecting shafts 54 can be one, two, three or four.

[0046] Furthermore, when the number of connecting shafts 54 is one, considering that the output connecting rod 3 can be directly pivoted to the connecting shaft 54, preferably, the connecting shaft 54 ​​is arranged between the second pivot portions 52 of the two positioning connecting rods 5 arranged opposite to each other near the power source 2, so that the output force required when the power source 2 drives the bottom connecting rod 4 to move through the output connecting rod 3 is smaller and the force is applied more evenly.

[0047] Furthermore, when the number of the connecting shaft 54 ​​is one and it is disposed between the second pivoting portions 52 of the two mutually oppositely disposed positioning connecting rods 5 close to the power source 2, the output connecting rod 3 and the connecting shaft 54 ​​can be designed as a single piece or a two-piece piece. Fig.10 As shown, the output connecting rod 3 can be L-shaped, and its two ends away from the power source 2 are protruding to serve as the connecting shaft 54 ​​to connect with the bottom connecting rod 4 and / or the positioning connecting rod 5, so that the connecting parts between the output connecting rod 3 and the connecting shaft 54 ​​can be omitted to achieve the purpose of simplifying the structure. When the output connecting rod 3 and the connecting shaft 54 ​​are designed as two pieces, as shown in FIG. Fig.11As shown, the output connecting rod 3 can be L-shaped, and has a through hole 31 at both ends away from the power source 2, so that the connecting shaft 54 ​​can pass through the output connecting rod 3 through the through hole 31, so that the connecting shaft 54 ​​protrudes from both ends of the output connecting rod 3, so that the connecting shaft 54 ​​can be connected to the positioning connecting rod 5 and / or the bottom connecting rod 4.

[0048] It should be noted that the connection shaft 54 ​​can be additionally provided according to user needs, that is, if only two positioning connecting rods 5 are provided on one side to link the lifting connecting rods 6 to drive the lifting and moving of the supporting plate 7, there is no need to provide a separate connection shaft 54.

[0049] Please refer to Figure 4 and Figure 5 , which is the lifting mechanism of the second embodiment of the present application. In this embodiment, the lifting mechanism includes a base 1, a power source 2, an output connecting rod 3, at least one bottom connecting rod 4, at least two positioning connecting rods 5, at least two cargo-lifting connecting rods 6 and a supporting plate 7. The structure of the lifting mechanism of this embodiment is the same as that of the first embodiment described above, and the only difference is that, in order to effectively improve the space usage below the supporting plate 7 of the lifting mechanism, that is, the position of the bottom plate 11, the bottom connecting rod 4 of the lifting mechanism of this embodiment is V-shaped, so as to facilitate the user to configure and plan the space below the supporting plate 7. The actuation mode of the lifting mechanism of this embodiment is the same as that of the first embodiment described above, so it will not be repeated.

[0050] See also Fig.12 , is a schematic diagram of the unmanned guided vehicle of the present application. The lifting mechanism included in the unmanned guided vehicle 100 is as described above, so it will not be described in detail.

[0051] It should be noted that the power source 2 of the lifting mechanism included in the automated guided vehicle 100 can be disposed on the bottom plate 11 or fixed at any position of the automated guided vehicle 100 according to user needs, and is not limited thereto.

[0052] Advantageous Effects of Embodiments

[0053] The beneficial effect of the present application lies in that the lifting mechanism provided by the present application includes a base, a power source, a power output connecting rod, at least one bottom connecting rod, at least two positioning connecting rods, at least two cargo lifting connecting rods and a supporting plate. Since the force application position of the lifting mechanism of the present application is different from that of the existing scissor-type lifting mechanism, the force application is changed from the middle to the bottom. Therefore, when the power source drives the power output connecting rod to move, the bottom connecting rod is linked to drive the two positioning connecting rods to swing, and the two cargo lifting connecting rods are linked to drive the supporting plate to move up and down, so that the lifting mechanism of the present application can lift 1000kg of cargo and set its lifting stroke to 50mm to complete the action in 6 seconds. It only needs a force of about 260Nm to lift the cargo; compared with the existing scissor-type lifting mechanism under the same conditions, it takes about 340~360Nm of force to lift the cargo, which obviously achieves the effect of reducing the total amount of force applied.

[0054] In addition, since the lifting mechanism provided by the present application requires a relatively low total amount of force, a power source with a relatively low total output force can be used when selecting a power source, thereby reducing the load on the power source, and a smaller power source can be used to drive the lifting mechanism, so that the usable space of the transport vehicle using the lifting mechanism provided by the present application is increased, and the energy consumption of the transport vehicle is reduced.

[0055] However, the above description is only a preferred embodiment of the present application and is not intended to limit the patent protection scope of the present application. Therefore, all equivalent changes made using the contents of the present application specification and drawings are also included in the scope of protection of the present application and are hereby stated.

Claims

1. A lifting mechanism, characterized in that: include: A base, comprising a bottom plate and at least two first fixing rods, wherein the two first fixing rods are erected on the bottom plate; A power source; One output connecting rod; at least one bottom connecting rod, wherein the output connecting rod is connected between the power source and the bottom connecting rod; At least two positioning links, each having a first pivoting portion, a second pivoting portion and a third pivoting portion, the first pivoting portions of the two positioning links are respectively pivoted to the two first fixing rods so that the two positioning links can swing on the two first fixing rods, and the second pivoting portions of the two positioning links are respectively pivoted to two ends of the bottom link; At least two cargo links; and a supporting plate, one end of the two cargo-lifting connecting rods is respectively connected to the supporting plate, and the third pivoting parts of the two positioning connecting rods are respectively pivotally connected to the other ends of the two cargo-lifting connecting rods; The power source can drive the output connecting rod to move, so as to link the bottom connecting rod to drive the two positioning connecting rods to swing, and link the two cargo-lifting connecting rods to drive the cargo-carrying plate to move up and down.

2. The lifting mechanism according to claim 1, characterized in that: At least one second fixing rod is erected on the bottom plate, and at least one limiting rod is arranged below the supporting plate, one end of the limiting rod is pivotally connected to one end of the second fixing rod, and the other end of the limiting rod is pivotally connected to the supporting plate.

3. The lifting mechanism according to claim 1, characterized in that: The bottom connecting rod is located below the two positioning connecting rods, and the two positioning connecting rods are located below the object-carrying plate.

4. The lifting mechanism according to claim 1, characterized in that: The bottom connecting rod is linear or non-linear.

5. The lifting mechanism according to claim 1, characterized in that: The first pivoting portion and the second pivoting portion are located on a straight line, and the third pivoting portion is located at a spacing on one side of the straight line.

6. The lifting mechanism according to claim 5, characterized in that: The distance between the first pivoting portion and the third pivoting portion is greater than the distance between the second pivoting portion and the third pivoting portion.

7. The lifting mechanism according to claim 1, characterized in that: The two positioning links can swing between a first position and a second position. When the two positioning links are in the first position, the supporting plate is located at a low point, and the horizontal height of the second pivot portion is lower than the horizontal height of the first pivot portion. When the two positioning links are in the second position, the supporting plate is located at a high point, and the horizontal height of the second pivot portion is also lower than the horizontal height of the first pivot portion.

8. The lifting mechanism according to claim 1, characterized in that: There are two bottom connecting rods, four positioning connecting rods, four first fixing rods, and four top cargo connecting rods. The first pivot joints of the four positioning connecting rods are respectively pivoted to the four first fixing rods, the second pivot joints of the four positioning connecting rods are respectively pivoted to the two ends of the two bottom connecting rods, one end of the four top cargo connecting rods is respectively connected to the cargo supporting plate, and the third pivot joints of the four positioning connecting rods are respectively pivoted to the other end of the four top cargo connecting rods.

9. The lifting mechanism according to claim 8, characterized in that: It comprises at least one connecting shaft, wherein the connecting shaft is connected between the two positioning connecting rods, and the two positioning connecting rods are arranged opposite to each other.

10. An unmanned guided vehicle, characterized in that: It comprises the lifting mechanism as described in any one of claims 1 to 9.

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