Quadruple leveling system for working bucket of overhead working truck

Abstract

A working bucket quadruple leveling system of an overhead working truck comprises a first-stage adjusting arm, a main arm, a small arm and a second-stage adjusting arm, the two ends of the main arm are hinged to the first-stage adjusting arm and the small arm respectively, the end, away from the main arm, of the small arm is hinged to the second-stage adjusting arm, and a working platform is installed on the second-stage adjusting arm. A fluctuating oil cylinder is installed between the first-stage adjusting arm and the main arm in a hinged mode, and a small arm fluctuating oil cylinder is installed between the small arm and the second-stage adjusting arm in a hinged mode. The first leveling oil cylinder and the second leveling oil cylinder are the same in size, rodless cavities and rod cavities of the first leveling oil cylinder and the second leveling oil cylinder communicate with each other to form a closed hydraulic system, the closed hydraulic system is matched with the position of a hinge point, the leveling function can be achieved through the simple hydraulic system, leveling is stable, and use is convenient; leveling of the working platform can be finely adjusted, and safety and comfort of workers are guaranteed; and a hidden protective net is arranged, so that the safety can be further improved.

Description

Technical Field

[0001] The invention relates to the technical field of aerial work vehicles, and in particular to a four-link leveling system for a working bucket of an aerial work vehicle. Background Art

[0002] Aerial work vehicles are special vehicles used to transport workers and equipment to the site and perform aerial work. This type of vehicle is equipped with a special device that lifts workers and work tools to a certain height through a lifting mechanism for aerial work. Aerial work vehicles are widely used in aerial work fields such as transportation, electricity, and municipal administration. The articulated boom aerial work vehicle can cross obstacles to perform aerial work. When the work platform is raised or lowered to any position, it can work while walking. Its intersecting arm structure has more flexible steering and can enter narrow passages and crowded work areas. It is usually used for aerial work in indoor ceilings and open-air places, and has a wide range of spatial operations.

[0003] The working platform 5 is usually installed on the top of the boom of the aerial work vehicle. When the aerial work vehicle controls the lifting or lowering of the working platform, the working platform will tilt due to the movement of the mechanical structure, which will make the people standing on it unable to stand or there is a risk of falling. Therefore, the working bucket must be kept in a horizontal state at all times during the boom amplitude change movement. Therefore, a leveling system is usually used to keep the working platform level. Boom-type aerial work vehicles usually use a hydrostatic leveling mechanism to control the boom to rotate, thereby driving the working platform to rise or move horizontally. However, the prior art usually refers to the use of a two- or three-link boom to control the working platform, and a similar triangle or parallelogram structure is used to ensure the level. However, this structure is prone to leveling errors in actual use, resulting in unstable work platforms, and the control system is complex and cannot adapt to more complex work scenarios.

[0004] Therefore, a four-link leveling system for the working bucket of an aerial work vehicle is needed to solve this problem. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a four-link leveling system for the working bucket of an aerial work vehicle, which effectively solves the above problems.

[0006] The technical solution is that the present invention comprises a primary adjusting arm, a main arm, a forearm and a secondary adjusting arm, the two ends of the main arm are respectively hinged on the primary adjusting arm and the forearm, one end of the forearm away from the main arm is hinged on the secondary adjusting arm, a working platform is installed on the secondary adjusting arm, a lifting cylinder is hingedly installed between the primary adjusting arm and the main arm, and a forearm lifting cylinder is hingedly installed between the forearm and the secondary adjusting arm;

[0007] The first adjustment arm and the second adjustment arm are provided with a first adjustment mechanism, and the rotation of the main arm driven by the ups and downs oil cylinder adjusts the second adjustment arm to rotate in the opposite direction through the first adjustment mechanism so that the working platform can be kept level;

[0008] The forearm and the secondary adjustment arm are provided with a second adjustment mechanism. The rotation of the forearm driven by the forearm up and down cylinder is adjusted through the second adjustment mechanism to adjust the secondary rotation so that the angle between the working platform and the main arm remains unchanged.

[0009] Furthermore, the first adjustment mechanism includes a first leveling cylinder whose two ends are hinged on the primary adjustment arm and the main arm, the primary adjustment arm is hinged to the main arm at point A, the first leveling cylinder is hinged to the main arm and the primary adjustment arm at points B and C respectively, the secondary adjustment arm is hinged to the forearm at point E, and a second leveling cylinder is hingedly installed on the forearm and the secondary adjustment arm, the second leveling cylinder is hinged to the secondary adjustment arm and the forearm at points D and F respectively, and the extension and retraction of the second leveling cylinder is controlled according to the extension and retraction amount of the first leveling cylinder so that the change of ∠BAC of the hinge triangle ABC is the same as the change of ∠DEF of the hinge triangle DEF.

[0010] Furthermore, the first leveling cylinder and the second leveling cylinder have the same size, and the rodless chamber and the rod chamber of the first leveling cylinder and the second leveling cylinder are respectively connected to form a closed hydraulic system, so that the extension or retraction amount of the first leveling cylinder is the same as the retraction amount or extension amount of the second leveling cylinder.

[0011] Furthermore, the forearm is provided with a swing arm installed at point E, and point F is located on the swing arm, so that the two ends of the second leveling cylinder are respectively connected to the secondary adjustment arm and the swing arm, and the extension and retraction of the second leveling cylinder can drive the ∠DEF of the hinge triangle DEF to change.

[0012] Furthermore, the second adjusting mechanism includes a pull rod hingedly mounted on the main arm and the secondary adjusting arm, the forearm is hinged to the main arm at point J, and both ends of the pull rod are hinged to the main arm and the secondary adjusting arm at points I and H respectively, points I, J, E and H constitute a parallelogram mechanism, constituting a structure in which the angle between the main arm and the secondary adjusting arm remains unchanged when the forearm rotates, and the second adjusting mechanism also includes a third leveling cylinder arranged on the main arm.

[0013] Furthermore, the working platform includes a base, on which a guardrail composed of multiple horizontal bars and vertical bars is provided. The guardrail is also provided with an entrance, at which a closed door is movably installed, and the entrance and the closed door are respectively provided with a card slot and a buckle.

[0014] Furthermore, a working chamber corresponding to the position of the guardrail is provided on the side of the base, and a driving shaft and a driven shaft are rotatably installed in the working chamber. An outlet and an inlet are respectively provided on the upper side of the driving shaft and the driven shaft at the upper end of the working chamber. At least two transmission belts are wound on the driven shaft, and the transmission belts extend out through the outlet. The transmission belts are wound around the cross bar and wound around the driving shaft through the inlet. A protective net is also installed on the transmission belt. A first drive motor and a second drive motor are also provided in the working chamber to respectively drive the driving shaft and the driven shaft to rotate.

[0015] Furthermore, the base is provided with an installation groove, in which a bottom plate is fixedly installed, a hinge is provided on the bottom plate, a support plate is hingedly installed on the hinge, a support block is slidably installed on the bottom plate, a support roller is rotatably installed on the upper end of the support block through the support frame, the support roller is slidably connected to the lower end of the support plate, a lead screw is rotatably installed in the installation groove, the lead screw is threadedly connected to the support block, a third drive motor for driving the lead screw to rotate is also provided in the installation groove, and a horizontal sensor is provided at the lower end of the support plate.

[0016] Furthermore, a groove is provided at the upper end of the support block, a support is slidably installed in the groove, an auxiliary roller is rotatably installed on the support, a positioning rod is provided at the lower end of the support, a slot corresponding to the position of the positioning rod is provided in the groove, the positioning rod is slidably connected in the slot, a spring is sleeved on the positioning rod, one end of the spring is connected to the support, and the other end of the spring is connected to the lower end of the groove.

[0017] The beneficial effects of the present invention are:

[0018] 1. The first leveling cylinder and the second leveling cylinder have the same size, and the rodless chamber and the rod chamber of the first leveling cylinder and the second leveling cylinder are connected to form a closed hydraulic system, and combined with the hinge position, the leveling function can be achieved through a simple hydraulic system, and the leveling is stable and easy to use;

[0019] 2. By setting support blocks and support rollers, the leveling of the working platform can be further refined to ensure the safety and comfort of the workers;

[0020] 3. Setting up a hidden protective net can ensure the safety of the staff and prevent objects on the supporting platform from falling, further improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention when it is in the first state.

[0022] Figure 2 It is a schematic structural diagram of the present invention when it is in the second state.

[0023] Figure 3 It is a schematic structural diagram of the present invention when it is in the third state.

[0024] Figure 4 It is a structural schematic diagram of the working platform of the present invention.

[0025] Figure 5 It is a schematic diagram of the structure of the protective net on the working platform of the present invention being unfolded.

[0026] Figure 6 It is a schematic diagram of the mechanism of the working chamber of the present invention.

[0027] Figure 7 The present invention Figure 4 Middle A is an enlarged cross-sectional view.

[0028] Figure 8 It is a structural schematic diagram of the support block of the present invention. DETAILED DESCRIPTION

[0029] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0030] Example:

[0031] Depend on Figures 1 to 8 The present invention comprises a primary adjusting arm 1, a main arm 2, a small arm 3 and a secondary adjusting arm 4, the two ends of the main arm 2 are respectively hinged on the primary adjusting arm 1 and the small arm 3, the end of the small arm 3 away from the main arm 2 is hinged to the secondary adjusting arm 4, a working platform 5 is installed on the secondary adjusting arm 4, a lifting cylinder 37 is hingedly installed between the primary adjusting arm 1 and the main arm 2, and a small arm lifting cylinder 38 is hingedly installed between the small arm 3 and the secondary adjusting arm 4;

[0032] The first adjustment arm 1 and the second adjustment arm 4 are provided with a first adjustment mechanism, and the rotation generated by the main arm 2 driven by the ups and downs oil cylinder 37 adjusts the second adjustment arm 4 to rotate in the opposite direction through the first adjustment mechanism so that the working platform 5 remains horizontal;

[0033] A second adjusting mechanism is provided on the forearm 3 and the secondary adjusting arm 4. The rotation generated by the forearm 3 driven by the forearm lifting cylinder 38 is adjusted through the second adjusting mechanism to adjust the secondary rotation so that the angle between the working platform 5 and the main arm 2 remains unchanged.

[0034] The first adjustment mechanism includes a first leveling cylinder 6 hinged at both ends on the first-stage adjusting arm 1 and the main arm 2 near one end of the first-stage adjusting arm 1, the first-stage adjusting arm 1 and the main arm 2 are hinged at point A, the first leveling cylinder 6 is hinged to the main arm 2 and the first-stage adjusting arm 1 at points B and C respectively, the second-stage adjusting arm 4 and the small arm 3 are hinged at point E, the small arm 3 and the second leveling cylinder 7 are hingedly installed on the second-stage adjusting arm 4 and the small arm 3 at points D and F respectively, the extension and contraction of the second leveling cylinder 7 is controlled according to the extension and contraction amount of the first leveling cylinder 6 so that the change of ∠BAC of the hinge triangle ABC is the same as the change of ∠DEF of the hinge triangle DEF, so that when the main arm 2 is rotated by the control of the ups and downs cylinder 37, it is controlled according to the extension and contraction amount of the first leveling cylinder 6 that changes when the main arm 2 rotates.

[0035] The first leveling cylinder 6 and the second leveling cylinder 7 have the same size, and the rodless chamber and the rod chamber of the first leveling cylinder 6 and the second leveling cylinder 7 are respectively connected to form a closed hydraulic system, so that the extension or retraction amount of the first leveling cylinder 6 is the same as the retraction amount or extension amount of the second leveling cylinder 7.

[0036] The forearm 3 is provided with a swing arm 8 installed at point E, and point F is located on the swing arm 8, so that the two ends of the second leveling cylinder 7 are respectively connected to the secondary adjustment arm 4 and the swing arm 8. The extension and retraction of the second leveling cylinder 7 can drive the ∠DEF of the hinge triangle DEF to change.

[0037] The second adjustment mechanism includes a pull rod 9 hingedly mounted on the main arm 2 and the secondary adjustment arm 4. The small arm 3 is hinged to the main arm 2 at point J. The two ends of the pull rod 9 are respectively hinged to the main arm 2 and the secondary adjustment arm 4 at points I and H. Points I, J, E and H constitute a parallelogram mechanism, which constitutes a structure in which the angle between the main arm 2 and the secondary adjustment arm 4 remains unchanged when the small arm 3 rotates. The second adjustment mechanism also includes a third leveling cylinder arranged on the main arm 1.

[0038] In addition, when errors occur due to the instability of the hydraulic adjustment system of the boom, the working platform 5 will also be tilted, so a self-adjusting system is set on the working platform 5 to maintain the stability and protection of the working platform 5. The working platform 5 includes a base 10, and the base 10 is provided with a three-sided guardrail composed of a plurality of horizontal bars 11 and vertical bars 12. The guardrail is also provided with an entrance, and a closed door 13 is movably installed at the entrance. The entrance and the closed door 13 are also provided with slots and buckles, respectively.

[0039] The side of the base 10 is provided with a working chamber 15 corresponding to the position of the guardrail, and a driving shaft 16 and a driven shaft 17 are rotatably installed in the working chamber 15. The upper end of the working chamber 15 is provided with an outlet 18 and an inlet 19 on the upper side of the driving shaft 16 and the driven shaft 17, respectively. At least two transmission belts 20 are wound on the driven shaft 17, and the transmission belt 20 extends through the outlet 18. The transmission belt 20 is wound around the uppermost cross bar 11 and is wound around the driving shaft 16 through the inlet 19. A protective net 21 is also installed on the transmission belt 20. The working chamber 15 is also provided with a driving shaft 16 and a driven shaft 17. The first drive motor and the second drive motor that rotate the driven shaft 17, when the staff enters the working platform 5 and closes the closed door 13 on the guardrail through the slot and the buckle, the first drive motor drives the driving shaft 16 to rotate by controlling the switch, so that the transmission belt 20 without the protective net 21 is gradually retracted into the working chamber 15, and the transmission belt 20 with the protective net 21 is moved to the side of the guardrail to achieve the protection effect. The second drive motor can also be controlled to rotate when needed or at the end of work, so that the transmission belt 20 with the protective net 21 is retracted into the working chamber 15.

[0040] The guardrail is provided with a control end, which controls the operation of the first drive motor and the second drive motor. A distance sensor can also be set at the entrance. The first drive motor and the second drive motor are controlled by the single-chip control system of the control end to adjust the position of the guard net 21 as the closed door 13 opens and closes.

[0041] The base 10 is also provided with a mounting groove 22, in which a bottom plate 23 is fixedly installed, a hinge is provided on the bottom plate 23, a support plate 25 is hingedly installed on the gallows 24, a support block 26 is also slidably installed on the bottom plate 23, a support roller 27 is rotatably installed on the upper end of the support block 26 through the support frame, the support roller 27 is slidably connected to the lower end of the support plate 25, a lead screw 28 is rotatably installed in the mounting groove 22, the lead screw 28 is threadedly connected to the support block 26, a third drive motor 29 for driving the lead screw 28 to rotate is also provided in the mounting groove 22, a horizontal sensor 30 is provided at the lower end of the support plate 25, and the controller is connected to the horizontal sensor 30 and the third drive motor 29 to control the third drive motor 29 to drive the lead screw 28 to move, thereby adjusting the angle of the support plate 25 to keep the support plate 25 in a horizontal state.

[0042] The support block 26 is provided with a positioning block, and the mounting groove 22 is also provided with a sliding groove in the same direction as the lead screw 28, and the positioning block is slidably installed in the sliding groove.

[0043] By providing two bases 10 and mounting one of the bases 10 on the support plate 25 of the other base 10, the directions of the lead screws 28 in the two bases 10 are horizontal and vertical, and the horizontal angles in multiple directions can be adjusted.

[0044] The upper end of the support block 26 is also provided with a groove 31, in which a support 32 is slidably installed, and an auxiliary roller 33 is rotatably installed on the support 32. A positioning rod 34 is also provided at the lower end of the support 32, and a slot 35 corresponding to the position of the positioning rod 34 is also provided in the groove 31. The positioning rod 34 is slidably connected in the slot 35, and a spring 36 is also sleeved on the positioning rod 34. One end of the spring 36 is connected to the support 32, and the other end of the spring 36 is connected to the lower end of the groove 31. The auxiliary roller 33 can be tightly attached to the lower end of the support plate 25 through the spring 36, providing a certain auxiliary supporting force to the support plate 25.

[0045] When the present invention is in use, when the control ups and downs oil cylinder 37 is extended, the main arm 2 produces ups and downs, and the first leveling oil cylinder 6 is extended accordingly. At this time, the ∠BAC of the hinge triangle ABC composed of the first leveling oil cylinder 6, the first adjusting arm and the hinge point of the first leveling oil cylinder 6 changes accordingly, that is, increases; because the rodless cavity and the rod cavity of the first leveling oil cylinder 6 and the second leveling oil cylinder 7 are respectively connected to form a closed hydraulic system, the extension amount or retraction amount of the first leveling oil cylinder 6 is the same as the retraction amount or extension amount of the second leveling oil cylinder 7, and the hinge triangle DEF composed of the hinge point of the second leveling oil cylinder 7, the secondary adjusting arm 4 and the forearm 3 is ∠DEF also changes accordingly, that is, it becomes smaller; since the lengths between AB and EF are equal, the lengths of AC are equal to the lengths of ED, and the extension or retraction of the first leveling cylinder 6 is the same as the retraction or extension of the second leveling cylinder 7, the increase in the angle of ∠BAC is equal to the decrease in the angle of ∠DEF. In addition, the arm 3 is driven to rise and fall by the extension and retraction of the arm rise and fall cylinder 38, thereby driving the lifting and lowering of the working platform 5. At this time, when the working platform 5 is sent to the corresponding working position, the working platform 5 is always kept in a horizontal state under the action of the primary adjusting arm 1, the main arm 2, the arm 3 and the secondary adjusting arm 4.

[0046] When there is or an error in the leveling device, the horizontal sensor 30 senses the tilt angle and transmits a signal to the controller. The controller controls the screw 28 to rotate forward or reverse, thereby adjusting the position of the support block 26 and adjusting the angle of the support plate 25, so as to ensure the stability of the staff standing on the support plate 25.

[0047] The beneficial effects of the present invention are:

[0048] 1. The first leveling cylinder and the second leveling cylinder have the same size, and the rodless chamber and the rod chamber of the first leveling cylinder and the second leveling cylinder are connected to form a closed hydraulic system, and combined with the hinge position, the leveling function can be achieved through a simple hydraulic system, and the leveling is stable and easy to use;

[0049] 2. By setting support blocks and support rollers, the leveling of the working platform can be further refined to ensure the safety and comfort of the workers;

[0050] 3. Setting up a hidden protective net can ensure the safety of the staff and prevent objects on the supporting platform from falling, further improving safety.

[0051] The above-mentioned specific implementation modes / embodiments are specific implementation modes of the present invention, which are used to illustrate the concept of the present invention, are explanatory and exemplary, and should not be interpreted as limiting the implementation modes of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims and the specification of this application. These technical solutions include technical solutions that adopt any obvious replacements and modifications to the embodiments described herein, which are within the scope of protection of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A four-link leveling system for an aerial work vehicle bucket, characterized in that: The utility model comprises a primary adjusting arm (1), a main arm (2), a small arm (3) and a secondary adjusting arm (4), wherein two ends of the main arm (2) are respectively hinged on the primary adjusting arm (1) and the small arm (3), one end of the small arm (3) away from the main arm (2) is hinged on the secondary adjusting arm (4), a working platform (5) is installed on the secondary adjusting arm (4), a lifting cylinder (37) is hingedly installed between the primary adjusting arm (1) and the main arm (2), and a small arm lifting cylinder (38) is hingedly installed between the small arm (3) and the secondary adjusting arm (4); A first adjustment mechanism is provided on the primary adjustment arm (1) and the secondary adjustment arm (4); the rotation generated by the main arm (2) driven by the ups and downs oil cylinder (37) adjusts the secondary adjustment arm (4) to rotate in the opposite direction through the first adjustment mechanism so that the working platform (5) remains horizontal; The forearm (3) and the secondary adjustment arm (4) are provided with a second adjustment mechanism. The rotation of the forearm (3) driven by the forearm up-and-down cylinder (38) is adjusted by the second adjustment mechanism to adjust the secondary rotation so that the angle between the working platform (5) and the main arm (2) remains unchanged.

2. The four-link leveling system for the working bucket of an aerial work vehicle according to claim 1, characterized in that: The first adjustment mechanism comprises a first leveling cylinder (6) whose two ends are hinged on the primary adjustment arm (1) and the main arm (2); the primary adjustment arm (1) is hinged to the main arm (2) at point A; the first leveling cylinder (6) is hinged to the main arm (2) and the primary adjustment arm (1) at points B and C respectively; the secondary adjustment arm (4) is hinged to the forearm (3) at point E; a second leveling cylinder (7) is hingedly mounted on the forearm (3) and the secondary adjustment arm (4); the second leveling cylinder (7) is hinged to the secondary adjustment arm (4) and the forearm (3) at points D and F respectively; the extension and retraction of the second leveling cylinder (7) is controlled according to the extension and retraction amount of the first leveling cylinder (6) so that the variation of ∠BAC of the hinge triangle ABC is the same as the variation of ∠DEF of the hinge triangle DEF.

3. A four-link leveling system for a working bucket of an aerial work vehicle according to claim 2, characterized in that: The first leveling cylinder (6) and the second leveling cylinder (7) have the same size, and the rodless chamber and the rod chamber of the first leveling cylinder (6) and the second leveling cylinder (7) are respectively connected to form a closed hydraulic system, so that the extension amount or retraction amount of the first leveling cylinder (6) is the same as the retraction amount or extension amount of the second leveling cylinder (7).

4. A four-link leveling system for a working bucket of an aerial work vehicle according to claim 3, characterized in that: The forearm (3) is provided with a swing arm (8) installed at point E, and point F is located on the swing arm (8), so that the two ends of the second leveling cylinder (7) are respectively connected to the secondary adjustment arm (4) and the swing arm (8), and the extension and retraction of the second leveling cylinder (7) can drive the ∠DEF of the hinge triangle DEF to change.

5. The four-link leveling system for the working bucket of an aerial work vehicle according to claim 1 is characterized in that: The second adjustment mechanism comprises a pull rod (9) hingedly mounted on the main arm (2) and the secondary adjustment arm (4); the forearm (3) is hingedly mounted on the main arm (2) at point J; the two ends of the pull rod (9) are respectively hingedly mounted on the main arm (2) and the secondary adjustment arm (4) at points I and H; points I, J, E and H constitute a parallelogram mechanism, constituting a structure in which the angle between the main arm (2) and the secondary adjustment arm (4) remains unchanged when the forearm (3) rotates; the second adjustment mechanism also comprises a third leveling cylinder arranged on the main arm (1).

6. A four-link leveling system for a working bucket of an aerial work vehicle according to claim 1, 2 or 5, characterized in that: The working platform (5) comprises a base (10), on which a plurality of horizontal bars (11) and vertical bars (12) are arranged to form a guardrail, and the guardrail is also provided with an entrance, at which a closed door (13) is movably installed, and a card slot and a card buckle are respectively provided on the entrance and the closed door (13).

7. A four-link leveling system for a working bucket of an aerial work vehicle according to claim 6, characterized in that: A working chamber (15) corresponding to the position of the guardrail is provided on the side of the base (10), wherein a driving shaft (16) and a driven shaft (17) are rotatably mounted in the working chamber (15), an outlet (18) and an inlet (19) are respectively provided at the upper end of the working chamber (15) on the upper sides of the driving shaft (16) and the driven shaft (17), at least two transmission belts (20) are wound around the driven shaft (17), the transmission belts (20) extend through the outlet (18), the transmission belts (20) are wound around the cross bar (11) and are wound around the driving shaft (16) through the inlet (19), a protection net (21) is also installed on the transmission belt (20), and a first driving motor and a second driving motor are also provided in the working chamber (15) for driving the driving shaft (16) and the driven shaft (17) to rotate respectively.

8. The four-link leveling system for the working bucket of an aerial work vehicle according to claim 7, characterized in that: The base (10) is further provided with a mounting groove (22), a bottom plate (23) is fixedly installed in the mounting groove (22), a hinge is provided on the bottom plate (23), a support plate (25) is hingedly installed on the hanger (24), a support block (26) is also slidably installed on the bottom plate (23), a support roller (27) is rotatably installed on the upper end of the support block (26) through the support frame, the support roller (27) is slidably connected to the lower end of the support plate (25), a lead screw (28) is rotatably installed in the mounting groove (22), the lead screw (28) is threadedly connected to the support block (26), a third drive motor (29) for driving the lead screw (28) to rotate is also provided in the mounting groove (22), and a level sensor (30) is provided at the lower end of the support plate (25).

9. A four-link leveling system for a working bucket of an aerial work vehicle according to claim 8, characterized in that: The upper end of the support block (26) is also provided with a groove (31), a support (32) is slidably installed in the groove (31), an auxiliary roller (33) is rotatably installed on the support (32), a positioning rod (34) is also provided at the lower end of the support (32), a slot (35) corresponding to the position of the positioning rod (34) is also provided in the groove (31), the positioning rod (34) is slidably connected in the slot (35), a spring (36) is also sleeved on the positioning rod (34), one end of the spring (36) is connected to the support (32), and the other end of the spring (36) is connected to the lower end of the groove (31).

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