Elevating work platform

Abstract

The application discloses a lifting work platform and relates to the field of engineering machinery. The lifting work platform comprises a lower vehicle mechanism, a luffing mechanism, a first counterweight, a second counterweight, an arm support and a platform. The lower vehicle mechanism is configured to provide support; the luffing mechanism is installed on a rotary table; the first counterweight is fixed to the lower vehicle mechanism; the second counterweight is slidably installed on the luffing mechanism; one end of the arm support is installed on the luffing mechanism and is configured to luff along with the luffing of the luffing mechanism; and the platform is installed on the other end of the arm support. The lifting work platform provided by the technical scheme has the advantages that the front and rear stability of the whole vehicle under different working conditions is greatly improved, and the safety of the mobile lifting work platform is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engineering machinery, and in particular to a lifting work platform. BACKGROUND

[0002] Mobile lifting work platforms are mainly applied in the construction, steel structure, venue and leasing industries, and as a kind of manned engineering equipment, its safety is extremely important, and the stability of the whole vehicle is adjusted by counterweight, which is self-evident.

[0003] In the related art, the mobile lifting work platform includes a fixed counterweight, and the position of the fixed counterweight relative to the rotating table is unchanged after the fixed counterweight is installed and placed in place.

[0004] The inventor finds that at least the following problems exist in the related art: In the related art, the fixed counterweight is used, the fixed counterweight is installed on the rotating table, and the weight and size of the fixed counterweight are very large, which leads to relatively large weight or size of the whole vehicle, and accordingly increases the overall cost, increases the energy consumption, or reduces the flexibility of the whole vehicle. SUMMARY

[0005] Embodiments of the present application provide a lifting work platform, comprising:

[0006] A lower vehicle mechanism configured to provide support;

[0007] An amplitude changing mechanism installed on the lower vehicle mechanism;

[0008] A first counterweight arranged on the lower vehicle mechanism;

[0009] A second counterweight slidably installed on the amplitude changing mechanism;

[0010] An arm support having one end installed on the amplitude changing mechanism; and

[0011] A platform installed on the other end of the arm support.

[0012] In some embodiments, the lower vehicle mechanism comprises:

[0013] A vehicle frame configured to provide support; and

[0014] A rotating table installed on the vehicle frame, the amplitude changing mechanism is installed on the rotating table, and the first counterweight is arranged on the rotating table.

[0015] In some embodiments, the lifting work platform further comprises:

[0016] A first driving mechanism having one end drivingly connected to the arm support and the other end installed on the lower vehicle mechanism; the first driving mechanism is configured to drive the amplitude changing of the arm support; and the arm support drives the amplitude changing of the amplitude changing mechanism together.

[0017] In some embodiments, the aerial work platform further comprises:

[0018] a second driving mechanism, in driving connection with the second counterweight, so as to drive the second counterweight to slide along the luffing mechanism to adjust the center of gravity of the aerial work platform.

[0019] In some embodiments, the first driving mechanism comprises:

[0020] a pull rod, rotatably connected to the lower car mechanism at one end and rotatably connected to the second counterweight at the other end.

[0021] In some embodiments, the luffing mechanism comprises:

[0022] a parallelogram mechanism, rotatably connected to the lower car mechanism at one end and rotatably connected to the boom at the other end.

[0023] In some embodiments, the parallelogram mechanism comprises:

[0024] a first linkage assembly, rotatably connected to the lower car mechanism at one end; the second counterweight is freely slidably mounted on the first linkage assembly;

[0025] a second linkage assembly, rotatably connected to the lower car mechanism at one end;

[0026] a first truss arm, rotatably connected to the other end of the first linkage assembly at one end and rotatably connected to the other end of the second linkage assembly at the other end;

[0027] a second truss arm, rotatably connected to the other end of the first linkage assembly and one end of the first truss arm at one end, and rotatably connected to the boom at the other end; and

[0028] a third truss arm, forming a triangle with the first truss arm and the second truss arm; one end of the third truss arm is rotatably connected to the second linkage assembly and the second linkage assembly, and the other end of the third truss arm is rotatably connected to the second truss arm and the boom.

[0029] wherein the first linkage assembly, the second linkage assembly, the first truss arm and the lower car mechanism together form the parallelogram mechanism.

[0030] In some embodiments, one of the second counterweight and the first linkage assembly is provided with a guide rail, and the other is provided with a sliding block; the sliding block cooperates with the guide rail; the length direction of the guide rail is along the length direction of the first linkage assembly.

[0031] In some embodiments, when the amplitude changing mechanism is in the initial position, the mounting position of the second counterweight is lower than the second linkage assembly.

[0032] In some embodiments, a first mounting rack is mounted on the top of the landing mechanism, and the first mounting rack protrudes from the top surface of the rotary table; one end of the first linkage assembly is mounted on the first mounting rack.

[0033] In some embodiments, a second mounting rack is mounted on the top of the landing mechanism, and the second mounting rack protrudes from the top surface of the landing mechanism; one end of the second linkage assembly is mounted on the second mounting rack.

[0034] In some embodiments, the position of the rotating connection between the first linkage assembly and the first mounting rack is lower than the position of the rotating connection between the second linkage assembly and the second mounting rack.

[0035] In some embodiments, when the amplitude changing mechanism is in the initial position, the second counterweight is located above the first counterweight and at the other end of the first linkage assembly.

[0036] In some embodiments, when the amplitude changing mechanism is in the final position, the second counterweight and the first counterweight are respectively located on both sides of the rotation center of the landing mechanism, and the second counterweight is located at one end of the first linkage assembly.

[0037] In some embodiments, the platform and the arm support are rotatably connected, so that the platform always maintains an upright state under the action of its own gravity during the amplitude changing of the arm support.

[0038] The lifting work platform provided by the above technical solution comprises a first counterweight and a second counterweight, wherein the first counterweight is fixed; the second counterweight automatically and dynamically adjusts the position of the center of gravity of the lifting work platform along with the amplitude changing of the amplitude changing mechanism of the lifting work platform, reduces the amplitude of the change of the center of gravity of the whole vehicle in the direction of the first counterweight when the arm support is raised, and reduces the amplitude of the change of the center of gravity of the whole vehicle in the direction away from the first counterweight when the arm support is lowered. Without increasing the weight and size of the whole vehicle, the real-time change of the position of the second counterweight greatly improves the forward tilting stability and the backward tilting stability of the whole vehicle in different working conditions, and improves the safety of the mobile lifting work platform. Moreover, the size and weight of the first counterweight required by the technical solution are small, and the space occupied by the first counterweight is small, so that the working performance, working safety, economy, flexibility and energy saving of the lifting work platform are improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0040] Figure 1 Schematic diagram of the lifting work platform provided by the embodiment of the application in the initial position.

[0041] Figure 2 Schematic diagram of the lifting work platform provided by the embodiment of the application in the intermediate amplitude-changing position.

[0042] Figure 3 Schematic diagram of the lifting work platform provided by the embodiment of the application in the final amplitude-changing position.

[0043] Figure 4 Schematic diagram of the second counterweight provided by the embodiment of the application.

[0044] Reference signs: 1, lower vehicle mechanism; 2, amplitude-changing mechanism; 3, first counterweight; 4, second counterweight; 5, arm support; 6, platform; 7, pull rod; 8, sliding block; 11, vehicle frame; 12, rotating table; 13, first mounting frame; 14, second mounting frame; 15, shaft; 21, first connecting rod assembly; 22, second connecting rod assembly; 23, first truss arm; 24, second truss arm; 25, third truss arm. DETAILED DESCRIPTION

[0045] The technical solutions provided by the application will be described in detail below. Figures 1-4 The technical solutions provided by the application will be described in detail below.

[0046] Reference will be made to Figure 1 The embodiment of the application provides a lifting work platform for transporting people and objects from one height to another height to complete high-altitude work, high-altitude material conveying and the like. The weight of the lifting work platform for carrying people and objects is related to the structural size of the platform 6, and the lifting work platform can generally realize the lifting demand of one person or multiple persons. The highest working height of the lifting work platform is generally 40 meters to 70 meters.

[0047] The lifting work platform comprises a lower vehicle mechanism 1, an amplitude-changing mechanism 2, a first counterweight 3, a second counterweight 4, an arm support 5 and a platform 6.

[0048] The off-vehicle mechanism 1 is configured to provide support. The structural size of the off-vehicle mechanism 1 is related to the specific vehicle model. The off-vehicle mechanism 1 comprises a vehicle frame 11 and a rotating table 12. The bottom of the vehicle frame 11 can be mounted with a walking mechanism, which is located on the ground P. There are various types of walking mechanisms: tracked walking mechanisms, wheeled walking mechanisms, loop rail walking mechanisms, etc. In some embodiments, in order to achieve the purpose of convenient field transportation, the walking mechanism adopts a wheeled walking mechanism, i.e., a tire. The tire has good maneuverability on hard ground, and the speed of field transportation is fast and efficient, which can meet the emergency needs of high-altitude fire rescue, etc.

[0049] Referring to Figure 1 , the rotating table 12 is mounted on the vehicle frame 11. Specifically, the rotating table 12 is rotatably mounted on the vehicle frame 11, and the rotating table 12 can rotate along the circumferential direction thereof to change the position and direction of the boom 5, thereby realizing the operation of the boom 5 in different directions. The structural size of the rotating table 6 is not limited, and generally, the rotating table 6 can realize 360° rotation along the circumferential direction thereof. This structure makes it possible to meet the working and rescue needs of the position of the boom 5 and the platform 6 connected with the boom 5 through the rotation of the rotating table 6 regardless of the position of the lifting work platform.

[0050] The luffing mechanism 2 is mounted on the off-vehicle mechanism 1, specifically on the rotating table 12. The luffing mechanism 2 is a mechanism that can change the inclination angle relative to the ground. The luffing mechanism 2 has various implementation forms. In some embodiments, the luffing mechanism 2 comprises a parallelogram mechanism, which can be composed of a plurality of truss arms, and the arrangement of the truss arms is determined according to the weight and other parameters of the boom 5 being lifted. The action of the luffing mechanism 2 is divided into two: one is called first luffing, and the other is called second luffing. In the process of Figures 1 to 3 , the boom 5 is slowly raised, which is called first luffing, or up-luffing. The up-luffing gradually increases the height of the people and objects carried by the platform 6 to meet the needs of high-altitude operation and high-altitude rescue, etc. In the process of Figures 3 to 1 , the boom 5 is slowly lowered, which is called second luffing, or down-luffing. The down-luffing gradually reduces the height of the people and objects carried by the platform 6 to meet the needs of returning to the ground, low-altitude operation, low-altitude rescue, etc.

[0051] The structural size and arrangement of the luffing mechanism 2 are related to the length, structure, and weight of the boom 5. The luffing of the luffing mechanism 2 is realized with the luffing of the boom 5. Referring to Figures 1 to 3, one end of the arm support 5 is installed on the luffing mechanism 2, and the arm support 5 is configured to luff with the luffing mechanism 2. The arm support 5 can rotate relative to the ground to complete the luffing operation. Specifically, the lifting working platform further comprises a first driving mechanism (not shown in the figure), one end of the first driving mechanism is drivingly connected with the arm support 5, and the other end of the first driving mechanism is installed on the lower vehicle mechanism 1, and specifically installed on the rotating table 12. The first driving mechanism is configured to drive the arm support 5 to luff. During the luffing of the arm support 5, since the arm support 5 is connected with the luffing mechanism 2, the arm support 5 will drive the luffing mechanism 2 to luff together. With the luffing of the arm support 5, the platform 6 located at the other end of the arm support 5 is lifted with the other end of the arm support 5.

[0052] The luffing mechanism 2 is arranged such that the arm support 5 is not directly installed on the rotating table 12, but is at a certain distance from the rotating table 12, and during the luffing of the arm support 5, the luffing mechanism 2 also luffs, which makes the arm support 5 have a greater lifting height under the driving of the first driving mechanism.

[0053] Referring to Figures 1 to 3 In some embodiments, the luffing mechanism 2 comprises a first linkage assembly 21, a second linkage assembly 22, a first truss arm 23, a second truss arm 24 and a third truss arm 25.

[0054] One end of the first linkage assembly 21 is rotatably connected with the rotating table 12. The first linkage assembly 21 can be formed by one rod or a plurality of rods. Referring to Figures 1 to 3 As shown, the first mounting frame 13 is installed on the top of the rotating table 12, one end of the first mounting frame 13 is installed on the top surface of the rotating table 12, and the other end of the first mounting frame 13 is higher than the top surface of the rotating table 12. One end of the first linkage assembly 21 is connected with the other end of the first mounting frame 13. One end of the first linkage assembly 21 is directly installed on the first mounting frame 13. The first mounting frame 13 makes one end of the first linkage assembly 21 lift away from the rotating table 12, so that the first linkage assembly 21 can avoid interfering with the rotating table 12 and interfering with the second linkage assembly 22 during luffing. The first mounting frame 13 can adopt various implementation forms such as steel structure and truss structure.

[0055] The second counterweight 4 is freely slidably installed on the first linkage assembly 21. The second counterweight 4 is in sliding fit with the first linkage assembly 21, and the second counterweight 4 moves along the length direction of the first linkage 31, referring to Figures 1 to 3 The moving direction of the position of the second counterweight 4 during the change.

[0056] In order to enable the second counterweight 4 to not only move from one end to the other end of the first connecting rod assembly 21 under the action of its own gravity, but also return from the other end to the one end, in some embodiments, the lifting working platform further comprises a second driving mechanism, which is drivingly connected with the second counterweight 4 to enable the second counterweight 4 to slide along the luffing mechanism 2 to adjust the center of gravity of the lifting working platform.

[0057] In some embodiments, the second driving mechanism further comprises a pull rod 7, which is located between the turntable 12 and the second counterweight 4, one end of the pull rod 7 is rotatably connected with the turntable 12, and the other end of the pull rod 7 is rotatably connected with the second counterweight 4. The turntable 12 is provided with a mounting lug plate, and one end of the pull rod 7 is mounted on the mounting lug plate to enable the pull rod 7 to freely rotate relative to the turntable 12 by means of a pin shaft, a bearing or the like. The other end of the pull rod 7 is mounted on the second counterweight 4, and is also connected by means of a mounting lug plate, a bearing or the like to ensure that the pull rod 7 can freely rotate relative to the second counterweight 4 about the shaft 15. The length of the pull rod 7 is constant, and the pull rod 7 is a rigid rod. In the luffing process, in the up-luffing process, the second counterweight 4 slides downward under the action of its own weight; in the down-luffing process, since the pull rod 7 rotates relative to the turntable 12, under the pushing of the pull rod 7 in the rotating process, the second counterweight 4 moves toward the side where the first truss arm 23 is located. On the other hand, the pull rod 7 has a certain supporting effect on the second counterweight 4 and also has a certain supporting effect on the first connecting rod assembly 21, so that the first connecting rod assembly 21 will not be bent and deformed due to the second counterweight 4, and the luffing mechanism 2 can stably maintain in the state of the luffing being completed, i.e. Figure 3 the state shown in the figure.

[0058] In some embodiments, one of the second counterweight 4 and the first connecting rod assembly 21 is provided with a guide rail (not shown in the figure), and the other is provided with a sliding block 8. The sliding block 8 cooperates with the guide rail; the length direction of the guide rail is along the length direction of the first connecting rod assembly 21. Referring to Figure 4 , specifically, the second counterweight 4 is provided with the sliding block 8, and the first connecting rod assembly 21 is provided with the guide rail. The second counterweight 4 is installed in the guide rail of the luffing mechanism 2 through the sliding block 8, and cooperates with the luffing mechanism 2 through the sliding block 8 to slide along the length direction of the first connecting rod assembly 21 of the luffing mechanism 2. The weight, sliding stroke and two-end fixing positions of the second counterweight 4 are determined according to calculation to ensure that the sliding process is smooth without problems such as dead points, abnormal sound and vibration.

[0059] One end of the second connecting rod assembly 22 is rotatably connected to the rotating platform 12. In some embodiments, the second mounting frame 14 is mounted on the top of the rotating platform 12, one end of the second mounting frame 14 is fixed to the top surface of the rotating platform 12, and the other end of the second mounting frame 14 is higher than the top surface of the rotating platform 12. One end of the second connecting rod assembly 22 is connected to the other end of the second mounting frame 14. One end of the second connecting rod assembly 22 is mounted to the first mounting frame 13. The second mounting frame 14 can adopt various forms such as steel structure and truss structure.

[0060] The height of the second mounting frame 14 is greater than the height of the first mounting frame 13. The position of the rotating connection between the first connecting rod assembly 21 and the first mounting frame 13 is lower than the position of the rotating connection between the second connecting rod assembly 22 and the second mounting frame 14. This arrangement allows the first connecting rod assembly 21 and the second connecting rod assembly 22 to have a certain distance from each other in the initial position (illustrated state), intermediate position (illustrated state), and final position (illustrated state), and the first connecting rod assembly 21 and the second connecting rod assembly 22 do not interfere with each other in any state. And in the initial position, the intermediate position and the final position, the length direction of the first connecting rod assembly 21 and the second connecting rod assembly 22 are parallel to each other. This structure makes the triangular structure formed by the first connecting rod assembly 21, the second connecting rod assembly 22, the first truss arm 23, the second truss arm 24, and the third truss arm 25 described below cooperate with each other, making the luffing operation of the luffing mechanism 2 very stable, and also making the luffing operation of the boom 5 very stable. The initial position refers to the position of the luffing mechanism 2 when it is not luffing, in this state, the lifting working platform can be transported, at this time the boom 5 does not work. Figure 1 Figure 2 Figure 3 The height of the second mounting frame 14 is greater than the height of the first mounting frame 13. The position of the rotating connection between the first connecting rod assembly 21 and the first mounting frame 13 is lower than the position of the rotating connection between the second connecting rod assembly 22 and the second mounting frame 14. This arrangement allows the first connecting rod assembly 21 and the second connecting rod assembly 22 to have a certain distance from each other in the initial position (illustrated state), intermediate position (illustrated state), and final position (illustrated state), and the first connecting rod assembly 21 and the second connecting rod assembly 22 do not interfere with each other in any state. And in the initial position, the intermediate position and the final position, the length direction of the first connecting rod assembly 21 and the second connecting rod assembly 22 are parallel to each other. This structure makes the triangular structure formed by the first connecting rod assembly 21, the second connecting rod assembly 22, the first truss arm 23, the second truss arm 24, and the third truss arm 25 described below cooperate with each other, making the luffing operation of the luffing mechanism 2 very stable, and also making the luffing operation of the boom 5 very stable. The initial position refers to the position of the luffing mechanism 2 when it is not luffing, in this state, the lifting working platform can be transported, at this time the boom 5 does not work.

[0061] One end of the first truss arm 23 is rotatably connected to the other end of the first connecting rod assembly 21, and the other end of the first truss arm 23 is rotatably connected to the other end of the second connecting rod assembly 22. One end of the second truss arm 24 is rotatably connected to the other end of the first connecting rod assembly 21 and the one end of the first truss arm 23, and the other end of the second truss arm 24 is rotatably connected to the boom 5. The third truss arm 25 and the first truss arm 23, the second truss arm 24 together form a triangle; one end of the third truss arm 25 is rotatably connected to the second connecting rod assembly 22, and the other end of the third truss arm 25 is rotatably connected to the second truss arm 24 and the boom 5.

[0062] ​​The first connecting rod assembly 21, the second connecting rod assembly 22, the first truss arm 23, and the turntable 12 (specifically, the connecting positions of the first connecting rod assembly 21 and the first mounting frame 13, and the connecting positions of the second connecting rod assembly 22 and the second mounting frame 14) substantially form a parallelogram connecting rod mechanism, so that the first connecting rod assembly 21 and the second connecting rod assembly 22 are parallel to each other regardless of the amplitude variation. Figure 2 The connecting positions M1 of the first connecting rod assembly 21 and the first mounting frame 13, and the connecting positions M2 of the second connecting rod assembly 22 and the second mounting frame 14, the line connecting M1 and M2 also corresponds to the length of the first truss arm 23, and the length of the line segment M1M2 is substantially equal to the length of the first truss arm 23.

[0063] The first counterweight 3 is fixed to the turntable 12. The first counterweight 3 is also called a fixed counterweight. After the first counterweight 3 is installed in place, its weight and position are fixed and do not change. The first counterweight 3 is located at the edge of the turntable 12. After the first counterweight 3 is installed to the turntable 12, its position and weight no longer change. The first counterweight 3 is used to adjust the position of the vehicle's center of gravity and ensure the stability of the vehicle. It should be noted that the first counterweight 3 has a limited effect on adjusting the stability of the vehicle. It does not independently adjust the center of gravity of the vehicle, but works together with the second counterweight 4 introduced later to adjust the center of gravity.

[0064] The second counterweight 4 is slidably installed in the amplitude variation mechanism 2. The second counterweight 4 is also called a movable counterweight. The second counterweight 4 is configured to automatically change its position relative to the turntable 12 during the amplitude variation of the amplitude variation mechanism 2. During the amplitude variation of the amplitude variation mechanism 2 from the initial position to the final position, the second counterweight 4 is farther and farther away from the first counterweight 3.

[0065] Referring to Figure 1 , specifically, when the amplitude variation mechanism 2 is in the initial position, the installation position of the second counterweight 4 is lower than the second connecting rod assembly 22. When the amplitude variation mechanism 2 is in the final position, the position of the second counterweight 4 is above the first counterweight 3 and at the other end of the first connecting rod assembly 21.

[0066] Referring to Figure 2 and Figure 3 , when the amplitude variation mechanism 2 is in the final position, the second counterweight 4 and the first counterweight 3 are respectively located on both sides of the rotation center of the turntable 12, and the second counterweight 4 is located at one end of the first connecting rod assembly 21.

[0067] In some embodiments, the weight of the first counterweight 3 is less than the weight of the second counterweight 4. After the second counterweight 4 is provided, the weight of the first counterweight 3 can be greatly reduced, which can reduce the size of the vehicle occupied by the first counterweight 3.

[0068] Working process: When working, the whole vehicle changes from the state shown in Figure 1 to Figure 2the state shown, to Figure 3 In the state shown, the angle a between the boom 5 and the ground gradually increases. In this process, the position of the first counterweight 3 does not change, and if there is no second counterweight 4, the position of the center of gravity of the whole vehicle changes in the direction S1, and the rear tilting stability becomes poor. After the second counterweight 4 is arranged, the second counterweight 4 moves along the direction S2, and then the center of gravity of the whole vehicle also moves in the direction S2, and the rear tilting stability becomes good. Finally, through the dynamic adjustment of the second counterweight 4, the rear tilting stability of the whole vehicle basically remains unchanged. When the luffing mechanism 2 and the boom 5 are regarded as a whole, the luffing of the two is driven by the first driving mechanism. In the process of luffing upward of the two, the second counterweight 4 can adjust the center of gravity of the whole formed by the luffing mechanism 2 and the boom 5, so that the center of gravity of the whole formed by the luffing mechanism 2 and the boom 5 is closer to the end of the turntable 12 away from the first counterweight 3, so as to reduce the risk of overturning of the lifting working platform and make the stability of the lifting working platform better.

[0069] The whole vehicle is Figure 3 from the state shown, to Figure 2 the state shown, to Figure 1 The angle a between the boom 5 and the ground gradually decreases. If the second counterweight 4 is not arranged, since the position of the first counterweight 3 does not change, the position of the center of gravity of the whole vehicle changes in the direction S2, and the front tilting stability becomes poor. If the second counterweight 4 is arranged, the second counterweight 4 slides along the luffing mechanism 2 in the direction S1, and the position of the center of gravity of the whole vehicle changes in the direction S1, and the front tilting stability becomes good. Finally, through the dynamic adjustment of the second counterweight 4, the front tilting stability of the whole vehicle basically remains unchanged. When the luffing mechanism 2 and the boom 5 are regarded as a whole, the luffing of the two is driven by the first driving mechanism. In the process of luffing downward of the two, the second counterweight 4 can adjust the center of gravity of the whole formed by the luffing mechanism 2 and the boom 5, so that the center of gravity of the whole formed by the luffing mechanism 2 and the boom 5 is closer to the first counterweight 3, so as to reduce the risk of overturning of the lifting working platform and make the stability of the lifting working platform better.

[0070] It can be seen that, through the arrangement of the second counterweight 4, the stability of the whole vehicle is basically unchanged in the process of luffing and resetting of the lifting working platform, which greatly increases the reliability of the whole vehicle. Compared with the related art, under the condition that the size of the whole vehicle is unchanged, by adopting the technical scheme of the present application, only a first counterweight 3 with a very small weight is needed to achieve the same stability of the whole vehicle as that achieved by a fixed counterweight with a large weight in the related art. Under the condition that the weight of the first counterweight 3 is the same as that of the fixed counterweight in the related art, the stability of the whole vehicle achieved by the technical scheme of the present application is much higher than that of the whole vehicle in the related art.

[0071] Continuing to refer to Figures 1 to 3The platform 6 is installed at the other end of the arm support 5. The platform 6 is used to carry people and objects, to transport people and objects from one height (such as the ground) to another height (such as the air), to achieve aerial rescue, aerial work and other projects. In some embodiments, the platform 6 is rotatably connected with the arm support 5, so that the platform 6 always stands upright under the action of its own gravity during the luffing of the arm support 5.

[0072] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0073] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A lifting work platform, characterized in that, Comprising: a lower vehicle mechanism (1) configured to provide support; an amplitude changing mechanism (2) mounted to the lower vehicle mechanism (1); a first counterweight (3) arranged on the lower vehicle mechanism (1); a second counterweight (4) slidably mounted to the amplitude changing mechanism (2); an arm support (5) having one end mounted to the amplitude changing mechanism (2); and a platform (6) mounted to the other end of the arm support (5); the amplitude changing mechanism (2) comprises a parallelogram mechanism, the parallelogram mechanism comprising: a first link assembly (21) having one end rotatably connected to the lower vehicle mechanism (1); the second counterweight (4) is freely slidably mounted to the first link assembly (21); a second link assembly (22) having one end rotatably connected to the lower vehicle mechanism (1); a first truss arm (23) having one end rotatably connected to the other end of the first link assembly (21) and the other end rotatably connected to the other end of the second link assembly (22); a second truss arm (24) having one end rotatably connected to the other end of the first link assembly (21) and the other end rotatably connected to the arm support (5); and a third truss arm (25) forming a triangle with the first truss arm (23) and the second truss arm (24); one end of the third truss arm (25) is rotatably connected to the second link assembly (22) and the other end of the third truss arm (25) is rotatably connected to the second truss arm (24) and the arm support (5); wherein the first link assembly (21), the second link assembly (22), the first truss arm (23) and the lower vehicle mechanism (1) together form the parallelogram mechanism; the lower vehicle mechanism (1) comprises: a vehicle frame (11) configured to provide support; and a turntable (12) mounted to the vehicle frame (11), the amplitude changing mechanism (2) is mounted to the turntable (12), and the first counterweight (3) is arranged on the turntable (12); a first mounting bracket (13) is mounted on the top of the lower vehicle mechanism (1), the first mounting bracket (13) protrudes from the top surface of the turntable (12); one end of the first link assembly (21) is mounted to the first mounting bracket (13); a second mounting bracket (14) is mounted on the top of the lower vehicle mechanism (1), the second mounting bracket (14) protrudes from the top surface of the lower vehicle mechanism (1); one end of the second link assembly (22) is mounted to the second mounting bracket (14); the position of the rotatable connection between the first link assembly (21) and the first mounting bracket (13) is lower than the position of the rotatable connection between the second link assembly (22) and the second mounting bracket (14).

2. The aerial work platform of claim 1, wherein, Further comprising: a first driving mechanism having one end drivingly connected to the arm support (5) and the other end mounted to the lower vehicle mechanism (1); the first driving mechanism is configured to drive the arm support (5) to change amplitude, and the arm support (5) drives the amplitude changing mechanism (2) to change amplitude together.

3. The aerial work platform of claim 1, wherein, Further comprising: A second driving mechanism is drivingly connected with the second counterweight (4) to make the second counterweight (4) slide along the luffing mechanism (2) to adjust the center of gravity of the lifting working platform.

4. The aerial work platform of claim 2, wherein, The first driving mechanism comprises: A pull rod (7) is located between the lower car mechanism (1) and the second counterweight (4), one end of the pull rod (7) is rotatably connected with the lower car mechanism (1), and the other end of the pull rod (7) is rotatably connected with the second counterweight (4).

5. The aerial lift of claim 1, wherein, One of the second counterweight (4) and the first connecting rod assembly (21) is provided with a guide rail, and the other is provided with a sliding block (8); the sliding block (8) cooperates with the guide rail; the length direction of the guide rail is along the length direction of the first connecting rod assembly (21).

6. The aerial lift of claim 1, wherein, When the luffing mechanism (2) is in the initial position, the installation position of the second counterweight (4) is lower than the second connecting rod assembly (22).

7. The aerial lift of claim 1, wherein, When the luffing mechanism (2) is in the initial position, the position of the second counterweight (4) is above the first counterweight (3) and at the other end of the first connecting rod assembly (21).

8. The aerial lift of claim 1, wherein, When the luffing mechanism (2) is in the final position, the second counterweight (4) and the first counterweight (3) are respectively located on both sides of the rotation center of the lower car mechanism (1), and the second counterweight (4) is located at one end of the first connecting rod assembly (21).

9. The aerial lift of claim 1, wherein, The platform (6) is rotatably connected with the arm frame (5) to make the platform (6) keep a vertical state under the action of its own gravity during the luffing of the arm frame (5).

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