Overhead working truck with center-passing folding arm

Abstract

The invention discloses an overhead working truck with a center-passing folding arm. The overhead working truck comprises a platform assembly, a platform leveling device, a connecting rod mechanism, a variable-amplitude oil cylinder, an upper arm assembly, a lower arm assembly and a truck body assembly, the platform leveling device comprises a leveling oil cylinder, a leveling hinged support and a closed enveloping chain mechanism; the connecting rod mechanism is a double-crank four-connecting-rod mechanism, a first connecting rod and a second connecting rod are connected through a connecting shaft, the upper arm assembly and the lower arm assembly are connected through four hinge points, and the large amplitude changing angle of the upper arm amplitude changing mechanism is larger than 180 degrees. According to the high-altitude operation vehicle, through the connection mode of combining four-connecting-rod amplitude variation, the closed chain and hydraulic leveling, under the condition that the length of the arm frame and the length of the whole vehicle are kept unchanged, the large amplitude variation angle of more than 180 degrees of the upper arm amplitude variation mechanism is achieved, the maximum operation amplitude and the maximum operation height of the high-altitude operation vehicle are increased, the large operation amplitude is achieved, and the working efficiency is improved. And the defect that the upper arm of the original folding arm high-altitude operation vehicle can only work above the lower arm is overcome, and the ground bearing operation is realized.

Description

Technical Field

[0001] The invention relates to the technical field of engineering vehicles, and in particular to a through-center folding arm aerial work vehicle. Background Art

[0002] Aerial work vehicles are special vehicles that carry people to high altitudes for work. With economic development, aerial work machinery is increasingly recognized in the market. At present, aerial work machinery is classified into three types according to the form of boom: folding boom, telescopic boom, and mixed boom. Among them, folding boom aerial work vehicles are widely used in gardens and municipal administration because of their ability to cross obstacles.

[0003] During each boom luffing movement of the aerial work vehicle, the platform needs to be leveled in real time to keep the platform parallel to the ground to ensure the safety of people on the working platform. The upper boom luffing device of the traditional folding boom aerial work vehicle is directly driven by the oil cylinder, and the platform leveling device generally uses a mechanical four-link or chain device for leveling the upper and lower arms at the same time, and the luffing angle and leveling angle are limited.

[0004] However, the existing folding arm aerial work vehicle has the following defects due to the structural type of its arm:

[0005] 1. The amplitude change angle of the upper arm relative to the lower arm is small. The amplitude change angle of the upper arm is limited by the leveling angle of the platform leveling device and can only change within a small angle. In particular, when the upper and lower arms are equipped with chains at the same time, the chain is open, and the leveling is achieved by the chain enveloping the sprocket. When the amplitude change of the upper arm relative to the lower arm exceeds 90°, the chain cannot envelop the sprocket, that is, the platform leveling cannot be achieved. Therefore, the traditional folding arm is limited by this structure and cannot achieve an amplitude change of more than 90° relative to the lower arm. Although the operating height can meet the use requirements during actual operation, the small amplitude change angle of the upper arm leads to a small operating range of the entire vehicle and a limited operating range, which cannot meet the customer's use requirements.

[0006] 2. Due to the small amplitude adjustment angle of the upper arm, the actual working range of the arm is above the upper arm, and the working bucket cannot reach the ground, so ground entry operations cannot be performed during use.

[0007] 3. Since the operation range and height are achieved only by the amplitude change of the upper and lower arms, the amplitude change angle of the upper arm is small. Under the condition of the same arm length, the working height achieved is small, and the high-altitude operation performance of the whole vehicle is not brought into play. Summary of the invention

[0008] The problem to be solved by the present invention is to provide a through-center folding arm aerial work vehicle, which can increase the amplitude change angle of the upper arm relative to the lower arm to greater than 180° when the arm length remains unchanged, and increase the working height and working range of the aerial work vehicle when the arm length and the whole vehicle length remain unchanged. At the same time, combined with the amplitude change of the lower arm, the working bucket can reach the ground during operation to perform ground entry operations.

[0009] The present invention adopts the following technical scheme: a cross-center folding arm aerial work vehicle, comprising: a platform assembly, a platform leveling device, a connecting rod mechanism, a variable amplitude oil cylinder, an upper arm assembly, a lower arm assembly, and a vehicle body assembly;

[0010] The platform leveling device comprises a leveling cylinder, a leveling hinge and a closed enveloping chain mechanism; the platform assembly is located at the end of the upper arm, and the platform leveling device is connected to the second shaft in the closed enveloping chain mechanism through a bracket;

[0011] The connecting rod mechanism is a double crank four-bar connecting rod mechanism, including a first connecting rod, a second connecting rod, and a connecting shaft. The connecting rod mechanism connects the upper arm assembly and the lower arm assembly through four hinge points to achieve a large amplitude variation angle of more than 180° for the upper arm amplitude variation mechanism.

[0012] Preferably, the platform assembly includes a working platform and a bracket, wherein the bracket is connected to the second shaft; the platform assembly is located at the end of the upper arm.

[0013] Preferably, the platform leveling device includes a lower leveling cylinder, an upper leveling cylinder, a leveling hinge, a closed enveloping chain, an upper sprocket, a lower sprocket, a first shaft, and a second shaft.

[0014] One end of the lower leveling cylinder is connected to the hinge point I on the turntable, and the other end is connected to the hinge point H on a lower arm; one end of the upper leveling cylinder is connected to the hinge point G on another lower arm, and the other end of the upper leveling cylinder is connected to the hinge point F under the leveling hinge seat.

[0015] The leveling hinge seat articulates the upper arm, the lower arm and the upper sprocket through the first axis and is connected to the first axis at the same time, and the two maintain no relative movement. The lower hinge point of the leveling hinge seat is connected to one end of the upper leveling cylinder.

[0016] The closed enveloping chain is closed, with one end meshing with the upper sprocket and the other end meshing with the lower sprocket; the upper sprocket is located at the end of the upper arm and is connected to the lower arm through the second shaft, and the two maintain no relative movement.

[0017] The second axis is located at the end of the upper arm, connected to the hinge point A of the upper arm, and the tail end is connected to the bracket.

[0018] Preferably, the connecting rod mechanism includes a first connecting rod, a second connecting rod, and a connecting shaft; one end of the first connecting rod is connected to the lower arm, and the other end is connected to the second connecting rod and the upper arm boom cylinder; one end of the second connecting rod is connected to the upper arm, and the other end is connected to the first connecting rod and the upper arm boom cylinder; the upper arm boom cylinder achieves upper arm boom lengthening by pushing the connecting shaft.

[0019] The connecting rod mechanism includes four hinge points, namely: the upper and lower arm connecting hinge point B, which is located at the head of the lower arm and connects the upper arm and the lower arm; the lower hinge point C of the first connecting rod is located at the head of the lower arm and connects the lower arm and one end of the first connecting rod; the upper hinge point D of the second connecting rod is located at the tail of the upper arm and connects the upper arm and the second connecting rod; the hinge point E of the upper and lower connecting rods and the upper arm luffing cylinder is located between the upper arm and the lower arm, connecting the two connecting rods and the upper arm luffing cylinder; the connecting rod mechanism connects the first connecting rod, the second connecting rod and the upper arm and the lower arm of the aerial vehicle through four hinge points to form a double crank four-link mechanism without dead angles.

[0020] Preferably, the luffing cylinder comprises an upper arm luffing cylinder and a lower arm luffing cylinder; one end of the upper arm luffing cylinder is fixed to the lower arm and the other end is connected to the connecting rod mechanism. One end of the lower arm luffing cylinder is connected to the turntable and the other end is connected to the lower arm.

[0021] Preferably, the upper arm assembly includes a first base arm and at least one telescopic arm and a telescopic cylinder; one end is connected to the lower arm, and the other end is connected to the platform assembly.

[0022] Preferably, the lower arm assembly comprises a second base arm, one end of which is hinged to the turntable and the other end of which is hinged to the upper arm.

[0023] Preferably, the vehicle body assembly includes a cab, a chassis, and a subframe, and the subframe is fixed on the chassis.

[0024] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0025] 1. Compared with the traditional folding arm aerial work vehicle, the over-center folding arm aerial work vehicle of the present invention adopts a combination of four-link luffing + closed chain and hydraulic leveling. While keeping the arm length and the vehicle length unchanged, the upper arm luffing mechanism achieves a large luffing angle of more than 180°, thereby increasing the maximum operating range and maximum operating height of the work vehicle, solving the problem that the traditional folding arm has a small maximum operating range and cannot reach the work site.

[0026] 2. The over-center folding arm aerial work vehicle of the present invention not only has the ability of the traditional folding arm to cross obstacles, but also increases the working height and working range of the aerial work vehicle under the condition of the same arm length and the whole vehicle length. At the same time, combined with the variable amplitude of the lower arm, the working bucket can reach the ground during operation, which can simultaneously achieve a large working range and solve the defect that the upper arm of the original folding arm aerial work vehicle can only work above the lower arm, thereby realizing ground-based operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of the driving state of the over-center folding arm aerial work vehicle of the present invention;

[0028] Figure 2 It is a schematic diagram of the upper and lower arm amplitude change and platform leveling device of the aerial work vehicle of the present invention;

[0029] Figure 3 It is an operation curve diagram of the cross-center folding arm aerial work vehicle of the present invention;

[0030] Figure 4 It is the operating curve diagram of a traditional folding arm aerial work vehicle.

[0031] Explanation of numbers in the figure: 8-turntable, 11-working platform, 12-bracket, 21-lower leveling cylinder, 22-upper leveling cylinder, 23-leveling hinge, 24-closed enveloping chain, 25-upper sprocket, 26-lower sprocket, 27-first shaft, 28-second shaft; 31-first connecting rod, 32-second connecting rod, 33-connecting shaft, 41-upper arm luffing cylinder, 42-lower arm luffing cylinder, 51-first base arm, 61-second base arm, 71-chassis, 72-subframe. DETAILED DESCRIPTION

[0032] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which the invention belongs. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention.

[0034] In one embodiment of the present invention, a cross-center folding arm aerial work vehicle, such as Figure 1As shown, it includes a platform assembly, a platform leveling device, a connecting rod mechanism, a luffing cylinder, an upper arm assembly, a lower arm assembly, and a vehicle body assembly. The platform leveling device includes a hydraulic leveling mechanism + a closed enveloping chain mechanism.

[0035] The platform assembly comprises a working platform 11 and a bracket 12. The bracket 12 is connected to the second shaft 28. The platform assembly is located at the end of the upper arm assembly.

[0036] like Figure 2 As shown, the platform leveling device includes: a lower leveling cylinder 21, an upper leveling cylinder 22, a leveling hinge seat 23, a closed enveloping chain 24, an upper sprocket 25, a lower sprocket 26, a first shaft 27, and a second shaft 28.

[0037] One end of the lower leveling cylinder 21 is connected to the hinge point I on the turntable 8, and the other end is connected to the hinge point H on a lower arm; one end of the upper leveling cylinder 22 is connected to the hinge point G on the other lower arm, and the other end is connected to the leveling hinge seat 23; the leveling hinge seat 23 hinges the upper arm, the lower arm and the lower sprocket 26 through the first shaft 27, and is connected to the first shaft 27 at the same time, and the two maintain no relative movement; the lower hinge point F of the leveling hinge seat is connected to one end of the upper leveling cylinder 22.

[0038] The closed enveloping chain is closed, with one end meshing with the upper sprocket 25 and the other end meshing with the lower sprocket 26; the lower sprocket 26 hinges the upper arm, the lower arm and the leveling hinge 23 through the first shaft 27, and is connected to the first shaft 27 at the same time, and the two maintain no relative movement; the upper sprocket 25 is located at the end of the upper arm, and is hinged to the upper arm hinge point A through the second shaft 28, and is connected to the second shaft 28 at the same time, and the two maintain no relative movement; the second shaft 28 is located at the end of the upper arm, connected to the upper arm hinge point A, and the tail end is connected to the bracket.

[0039] The connecting rod mechanism includes four hinge points, namely: the upper and lower arm connecting hinge point B, which is located at the head of the lower arm and connects the upper arm and the lower arm; the lower hinge point C of the first connecting rod is located at the head of the lower arm and connects the lower arm and one end of the first connecting rod; the upper hinge point D of the second connecting rod is located at the tail of the upper arm and connects the upper arm and the second connecting rod; the hinge point E of the upper and lower connecting rods and the upper arm luffing cylinder is located between the upper arm and the lower arm and connects the two connecting rods and the upper arm luffing cylinder; the connecting rod mechanism connects the first connecting rod, the second connecting rod and the upper arm and the lower arm of the aerial vehicle through four hinge points to form a double crank four-bar connecting rod mechanism.

[0040] Furthermore, the connecting rod mechanism includes: a first connecting rod 31, a second connecting rod 32, and a connecting shaft 33; one end of the first connecting rod 31 is connected to the lower arm through the lower hinge point C of the first connecting rod, and the other end is connected to the second connecting rod 32 and the upper arm luffing cylinder through the upper and lower connecting rods and the upper arm luffing cylinder hinge point E; one end of the second connecting rod 32 is connected to the upper arm through the upper hinge point D of the second connecting rod, and the other end is connected to the first connecting rod 31 and the upper arm luffing cylinder 41 through the upper and lower connecting rods and the upper arm luffing cylinder hinge point E; the upper arm luffing cylinder 41 performs upper arm luffing by pushing the connecting shaft 33.

[0041] The luffing cylinder comprises: an upper arm luffing cylinder 41 and a lower arm luffing cylinder 42; one end of the upper arm luffing cylinder 41 is fixed to the lower arm, and the other end is connected to the connecting rod mechanism; one end of the lower arm luffing cylinder 41 is connected to the turntable 8, and the other end is connected to the lower arm.

[0042] The upper arm assembly comprises: a first base arm 51, one end of which is hinged to the lower arm and the other end of which is connected to the platform assembly.

[0043] The lower arm assembly comprises: a second base arm 61, one end of which is hinged to the turntable 8, and the other end of which is hinged to the upper arm.

[0044] The vehicle body assembly includes a chassis 71 and an auxiliary frame 72 , wherein the auxiliary frame 72 is fixed on the chassis 71 .

[0045] When in use, the traditional folding arm aerial work vehicle, working conditions such as Figure 4 As shown, when the upper and lower arms are equipped with chains at the same time, the chains are open, and the leveling is achieved by the chain enveloping the sprocket. Under working condition I, the lower arm is unfolded to the maximum extent, and the upper arm is horizontal to the ground; under working condition II, both the upper and lower arms are unfolded to the maximum extent; under working condition III, the lower arm is horizontal to the ground, and the upper arm is unfolded to the maximum extent.

[0046] It can be seen that the traditional folding aerial work vehicle only relies on the amplitude change of the upper and lower arms to achieve the working range and working height during operation. The amplitude change angle of the upper arm relative to the lower arm is small, and the amplitude change angle of the upper arm is limited by the leveling angle of the platform leveling device. It can only change within a small angle. In fact, the working range of the arm is above the lower arm, and the working bucket cannot reach the ground. In particular, when the amplitude change of the upper arm relative to the lower arm exceeds 90°, the chain cannot wrap around the sprocket, that is, the amplitude change of the upper arm relative to the lower arm by more than 90° cannot be achieved.

[0047] The folding arm aerial work vehicle of this embodiment has the following working conditions: Figure 3As shown, a connection method combining four-link luffing + closed chain and hydraulic leveling is adopted. Under working condition I, the lower arm is unfolded to the maximum range, perpendicular to the ground, and the upper arm is horizontal to the ground through 90-degree luffing; under working condition II, the upper and lower arms are both unfolded to the maximum range, and the upper and lower arms are unfolded to approximately a straight line, perpendicular to the ground; under working condition III, the lower arm is horizontal to the ground, the upper arm is unfolded to the maximum range, realizing 180° luffing, and the upper and lower arms are unfolded to approximately a straight line, and the platform can reach the ground.

[0048] It can be seen that the aerial work vehicle of this embodiment achieves a large luffing angle of more than 180° for the upper arm luffing mechanism while keeping the arm length and the whole vehicle length unchanged, thereby increasing the maximum operating range and maximum operating height of the work vehicle, and solving the problem that the traditional folding arm has a small maximum operating range and cannot reach the work site.

[0049] Therefore, the aerial work vehicle of this embodiment not only has the ability of a traditional folding arm to cross obstacles, but can also simultaneously achieve a large operating range and solve the defect that the upper arm of the original folding arm aerial work vehicle can only work above the lower arm, thereby realizing ground access operations.

[0050] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A cross-center folding arm aerial work vehicle, It is characterized in that include: Platform assembly, platform leveling device, connecting rod mechanism, luffing cylinder, upper arm assembly, lower arm assembly, vehicle body assembly; The platform leveling device comprises a leveling oil cylinder, a leveling hinge seat and a closed enveloping chain mechanism; the platform assembly is located at the end of the upper arm assembly, and the platform leveling device is connected to the second shaft in the closed enveloping chain mechanism through a bracket; The connecting rod mechanism is a double crank four-bar connecting rod mechanism, including a first connecting rod, a second connecting rod and a connecting shaft. The connecting rod mechanism connects the upper arm assembly and the lower arm assembly through four hinge points to achieve a large amplitude variation angle of more than 180° for the upper arm amplitude variation mechanism.

2. The over-center folding arm aerial work vehicle according to claim 1, Features: The closed enveloping chain mechanism comprises: a closed enveloping chain, an upper sprocket, a lower sprocket, a first shaft, and a second shaft; The two ends of the closed envelope chain are respectively meshed with the lower sprocket and the upper sprocket. The lower sprocket is connected to the first axis, and the upper arm, the lower arm and the leveling hinge are hinged through the first axis. The upper sprocket is located at the end of the upper arm, connected to the second axis, and hinged to the upper arm hinge point A through the second axis. The second axis is located at the end of the upper arm, connected to the upper arm hinge point A, and the tail end is connected to the bracket on the platform assembly.

3. The over-center folding arm aerial work vehicle according to claim 2, Features: The lower sprocket and the first shaft maintain no relative motion, and the upper sprocket and the second shaft maintain no relative motion.

4. The over-center folding arm aerial work vehicle according to claim 2, Features: The leveling hinge is connected to the first shaft, and the upper arm, the lower arm and the lower sprocket are hinged through the first shaft. The leveling hinge and the first shaft maintain no relative movement.

5. The over-center folding arm aerial work vehicle according to claim 1, Features: The leveling cylinder includes a lower leveling cylinder and an upper leveling cylinder. One end of the lower leveling cylinder is connected to the hinge point I on the turntable, and the other end is connected to the hinge point H on a lower arm; one end of the upper leveling cylinder is connected to the hinge point G on another lower arm, and the other end is connected to the lower hinge point F of the leveling hinge seat.

6. The over-center folding arm aerial work vehicle according to claim 1, Features: The luffing cylinder comprises an upper arm luffing cylinder and a lower arm luffing cylinder; one end of the upper arm luffing cylinder is fixed to the lower arm, and the other end is connected to the connecting rod mechanism; one end of the lower arm luffing cylinder is connected to the turntable, and the other end is connected to the lower arm.

7. The over-center folding arm aerial work vehicle according to claim 6, Features: The connecting rod mechanism includes four hinge points, namely: the upper and lower arm connecting hinge point B, which is located at the head of the lower arm and connects the upper arm and the lower arm; the lower hinge point C of the first connecting rod is located at the head of the lower arm and connects the lower arm and one end of the first connecting rod; the upper hinge point D of the second connecting rod is located at the tail of the upper arm and connects the upper arm and the second connecting rod; the hinge point E of the upper and lower connecting rods and the upper arm boom cylinder is located between the upper arm and the lower arm and connects the two connecting rods and the upper arm boom cylinder; the connecting rod mechanism connects the first connecting rod, the second connecting rod and the upper arm and the lower arm of the aerial vehicle through four hinge points to form a double crank four-link mechanism.

8. The over-center folding arm aerial work vehicle according to claim 7, Features: One end of the first connecting rod is connected to the lower arm through the lower hinge point C of the first connecting rod, and the other end is connected to the second connecting rod and the upper arm luffing cylinder through the hinge point E of the upper and lower connecting rods and the upper arm luffing cylinder; one end of the second connecting rod is connected to the upper arm through the upper hinge point D of the second connecting rod, and the other end is connected to the first connecting rod and the upper arm luffing cylinder through the hinge point E of the upper and lower connecting rods and the upper arm luffing cylinder. The upper arm luffing cylinder performs upper arm luffing by pushing the connecting shaft.

9. The over-center folding arm aerial work vehicle according to claim 1, Features: The platform assembly includes a working platform and a bracket, and the bracket is connected to the second shaft.

10. The over-center folding arm aerial work vehicle according to claim 8, Features: The upper arm assembly includes a first basic arm and at least one telescopic arm and a telescopic cylinder, one end of which is connected to the lower arm and the other end is connected to the platform assembly; the lower arm assembly includes a second basic arm, one end of which is hinged to the turntable and the other end is hinged to the upper arm; the vehicle body assembly includes a cab, a chassis, and a subframe, and the subframe is fixed to the chassis.

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