Overhead working truck

Abstract

The overhead working truck comprises a working platform, a supporting arm, a truck body and an arm frame, one end of the arm frame is in transmission connection with the truck body, and the other end of the arm frame is in transmission connection with the working platform through the supporting arm. The rotary mechanism is arranged on the bottom face of the working platform, the rotating mechanism is located below the rotary mechanism, the rotary mechanism and the rotating mechanism are integrally arranged in the outer shell, and the rotary mechanism is connected with the working platform and used for driving the working platform to rotate left and right. The rotating mechanism is connected with the supporting arm and used for driving the working platform to rotate up and down. The device is stable and reliable, is not liable to shake during adjustment, and guarantees the personal safety of operators.

Description

Technical Field

[0001] The invention relates to an aerial work vehicle and belongs to the technical field of aerial work. Background Art

[0002] Aerial work vehicles are widely used in aerial operations, equipment installation, maintenance, etc. in various industries. When working, they need to be lifted to the required position, and the operator is located on the top working platform or work bar to perform the corresponding operations, and will also make corresponding position adjustments during work to facilitate operation.

[0003] A Chinese patent application with publication number CN111086961A discloses a crank arm lifting structure for a high-altitude work platform vehicle, including a rotating base installed above the vehicle chassis, a first crank arm, a first connecting rod, a first connecting block, a second crank arm, a second connecting rod, a second connecting block, a third crank arm, a third connecting block, a fourth crank arm, a fourth connecting rod, a fourth connecting block, and a lifting platform, wherein the first crank arm and the first connecting rod are movably connected between the rotating base and the first connecting block, the second crank arm and the second connecting rod are movably connected between the first connecting block and the second connecting block, the third crank arm is movably connected between the second connecting block and the third connecting block, and the fourth crank arm and the fourth connecting rod are movably connected between the third connecting block and the fourth connecting block. However, in the prior art including the above patents, the stability is relatively poor and the safety is not good enough when working. Summary of the invention

[0004] The purpose of the present invention is to provide an aerial work vehicle which solves the shortcomings of the prior art and can ensure the personal safety of operators.

[0005] The above-mentioned technical purpose of the present invention is mainly solved by the following technical solutions: an aerial work vehicle, comprising a working platform, a support arm, a vehicle body and an arm, wherein one end of the arm is transmission connected to the vehicle body, and the other end of the arm is transmission connected to the working platform through the support arm, and also comprises a slewing mechanism arranged on the bottom surface of the working platform, a rotating mechanism located below the slewing mechanism and an outer shell, the slewing mechanism and the rotating mechanism are integrated in the outer shell, the slewing mechanism is connected to the working platform for driving the working platform to rotate left and right, and the rotating mechanism is connected to the support arm for driving the working platform to rotate up and down.

[0006] As a further preferred technical solution of the present invention; the rotating mechanism includes a rotating worm gear transmission and a rotating drive unit for driving the rotating worm gear transmission, the output end of the rotating worm gear transmission is connected to the working platform, and the rotating drive unit is used to drive the rotating worm gear transmission to rotate.

[0007] As a further preferred technical solution of the present invention; the rotating mechanism includes a rotating worm gear transmission and a rotating driving unit for driving the rotating worm gear transmission, the end of the support arm is provided with a mounting opening, the rotating worm gear transmission is arranged in the mounting opening, the rotating worm gear transmission is fixed to the support arm, and the rotating driving unit is used to drive the rotating worm gear transmission to rotate.

[0008] As a further preferred technical solution of the present invention, the slewing drive unit and the rotating drive unit are drive motors or hydraulic motors.

[0009] As a further preferred technical solution of the present invention, the rotation direction of the slewing mechanism is perpendicular to the rotation direction of the rotating mechanism.

[0010] As a further preferred technical solution of the present invention, the support arm includes a mounting arm, an inclined arm fixedly connected to the mounting arm, and an extension arm fixedly connected to the inclined arm, and the mounting opening is provided at the end of the mounting arm.

[0011] As a further preferred technical solution of the present invention; the boom includes a primary boom, a secondary boom and a tertiary boom which can rotate up and down relative to the vehicle body, the secondary boom is sleeved on the outer wall of the tertiary boom, the primary boom is sleeved on the secondary boom, and a telescopic hydraulic cylinder is provided inside the primary boom for driving the tertiary boom to move along the length direction.

[0012] As a further preferred technical solution of the present invention; the telescopic hydraulic cylinder includes a fixed section connected to the end of the first-level boom, a first-level telescopic section connected to the fixed section, and a second-level telescopic section connected to the first-level telescopic section, and the end of the second-level telescopic section is connected to the side wall of the third-level boom through a pin shaft.

[0013] As a further preferred technical solution of the present invention; a first limit sleeve is provided on the outer wall of the end of the first-level arm, and a first limit slider which slides with the outer wall of the second-level arm is provided on the inner side of the first limit sleeve; a second limit slider which cooperates with the inner wall of the first-level arm is provided at one end of the second-level arm, and a second limit sleeve which cooperates with the first limit sleeve is provided at the other end of the second-level arm. A third limit slider which slides with the outer wall of the third-level arm is provided on the inner side of the second limit sleeve; a fourth limit slider which cooperates with the inner wall of the second-level arm is provided on the outer wall of one end of the third-level arm, and the other end of the third-level arm is connected to the end of the support arm.

[0014] As a further preferred technical solution of the present invention; a first positioning block located on the inner side of the secondary boom is provided on the outer wall of the third-level boom, one end of the support arm connected to the third-level boom is sleeved on the side wall of the end of the third-level boom, and a second positioning block located on the inner side of the first-level boom is provided on the outer wall of the second-level boom.

[0015] Therefore, the present invention is stable and reliable, not easy to shake, ensures the sense of security of the operator, improves safety, and ensures that the operator can work efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the appendix of patent CN111086961A Figure 1 , in order to show it clearly, part of it was intercepted this time;

[0017] Figure 2 It is a schematic diagram of the structure of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of the connection between the working platform and the support arm in the present invention;

[0019] Figure 4 yes Figure 3 Structural diagram of the slewing mechanism and the rotating mechanism in FIG.

[0020] Figure 5 yes Figure 2 Structural cross-sectional view of the boom in FIG.

[0021] Explanation of the accompanying drawings: 1-working platform; 2-support arm, 21-installing arm 21, 22-tilting arm, 23-extension arm, 211-installing opening, 3-rotating mechanism, 300-outer shell, 301-rotating worm gear transmission, 302-rotating drive unit, 4-rotating mechanism, 401-rotating worm gear transmission, 402-rotating drive unit, 5-car body, 6-arm, 61-first arm, 62-second arm, 63-third arm, 64 telescopic hydraulic cylinder, 641-fixed section, 642-first telescopic section, 643-second telescopic section, 644-pin shaft, 611-first limiting sleeve, 612-first limiting slider, 621-second limiting slider, 622-second limiting sleeve, 623-third limiting slider, 624-second positioning block, 631-first positioning block, 632-fourth limiting slider. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0023] See attached Figure 1 , as disclosed in patent CN111086961A Figure 1It is a common structure in existing aerial work vehicles. The applicant has found in actual application that the existing aerial work vehicles, when adjusting their working platform 1, need to perform horizontal slewing and vertical rotation. In the adjustment in these two directions, the rotation in the vertical direction, taking the patent CN111086961A as an example, needs to adjust the fourth crank arm 10 and the third drive cylinder 18 to cooperate with each other to achieve the vertical rotation of the working platform 1. At this time, the force point is at the eleventh hinge hole 9a. At this time, due to the effect of the lever arm, even a small adjustment on the working platform 1 will result in relatively large shaking. This makes the operator on the working platform 1 feel very uneasy, which seriously affects the personal safety of the operator on the working platform 1. After all, the operator's working position is located at a height of more than ten meters or even dozens of meters. To address this problem, the applicant has developed the aerial work vehicle of the present application.

[0024] like Figure 2-4 As shown, in this embodiment, the working platform 1 is used to cooperate with the operator to operate on it, and it can rotate in the horizontal direction and the vertical direction, which is very safe. In order to achieve this technical purpose, in this application, a slewing mechanism 3 is arranged on the bottom surface of the working platform 1, and the slewing mechanism 3 can drive the working platform 1 to rotate in the horizontal direction. At the same time, a rotating mechanism 4 is arranged below the slewing mechanism 3, and the rotating mechanism 4 drives the slewing mechanism 3 and the working platform 1 to rotate. The slewing direction of the slewing mechanism 3 and the slewing direction of the slewing mechanism 4 are perpendicular to each other, and the slewing mechanism 3 has a first outer shell 303, and the rotating mechanism 4 has a first outer shell 304. The two outer shells 403, the first outer shell 303 and the second outer shell 403 are fixedly connected into one body in an upper and lower arrangement, and the fixing method can be welding fixation and screw fixation, or other well-known methods are used to fix them together so as to rotate together; through the above structure, the rotation point of the working platform 1 during rotation is transferred to the middle part below the working platform 1, so that when the working platform 1 rotates, the force arm generated by it is smaller. Compared with the existing rotation method of the working platform 1, the amplification effect of the lever is greatly eliminated, so that during the entire adjustment process, the shaking of the working platform 1 is very small, thereby ensuring the safety of the operator on the working platform 1.

[0025] During installation, the rotating mechanism 4 is installed on the support arm 2. One end of the support arm 2 is provided with an installation opening 211 for installing the rotating mechanism 4. The size of the installation opening 211 should meet the space required for the rotating mechanism 4 to rotate. The support arm 2 can be the entire boom of the aerial work vehicle in the prior art (similar to the attached Figure 1The third curved arm 8 in the embodiment may also be a structure as in the present embodiment. Since the structures in the prior art are all known, the applicant describes the support arm 2 in the present application here. In the present embodiment, the support arm 2 includes three parts, namely the mounting arm 21. The mounting opening 211 is opened at the end of the mounting arm 21. The mounting arm 21 is fixedly connected to the tilting arm 22, and the tilting arm 22 is fixedly connected to the extension arm 23. The extension arm 23 is connected to the boom of the aerial work vehicle. The mounting arm 21, the tilting arm 22, and the extension arm 23 are fixedly connected by welding or screwing, among which welding is preferably selected for fixing.

[0026] When working, because the slewing mechanism 3 is arranged at the bottom center of the working platform 1, the slewing output end of the slewing mechanism 3 (i.e., the rotating disk or rotating shaft used for external connection) is fixedly connected to the bottom surface of the working platform 1, it can drive the working platform 1 to rotate to reach the required position, and the slewing mechanism 4 is fixedly connected to the bottom of the slewing mechanism 3. After the slewing mechanism 4 is started, it rotates longitudinally relative to the mounting arm 21 of the support arm 2 to maintain the horizontal state of the working platform 1, such as Figure 3 As shown, the rotary mechanism 3 includes a rotary worm gear transmission 301 and a rotary drive unit 302, the first outer shell 303 is the outer shell of the rotary worm gear transmission 301, and the rotary drive unit 302 drives the rotary worm gear transmission 301, so that the rotary worm gear transmission 301 drives the working platform 1 to rotate stably horizontally, so as to adjust the direction of the working platform and facilitate the work of the operator; the rotating mechanism 4 includes a rotary worm gear transmission 401 and a rotary drive unit 402, the second outer shell 403 is the outer shell of the rotary worm gear transmission 401, and the rotary drive unit 402 drives the rotary worm gear transmission 401, so that the rotary worm gear transmission 401 drives the working platform 1 to rotate stably horizontally, so as to adjust the direction of the working platform and facilitate the work of the operator; The table 1 and the slewing mechanism 3 rotate longitudinally, which can minimize the shaking of the working platform 1 and keep the working platform 1 stable. The slewing drive unit 302 and the rotating drive unit 402 both use drive motors or hydraulic motors, and other known drive components that can play the same role can also be used. They can be selected according to actual conditions. The slewing worm gear transmission 301 and the rotating worm gear transmission 401 can both be purchased externally, and their specific structures are not described in detail here. When the rotating worm gear transmission 401 and the support arm 2 are installed, the output end of the rotating worm gear transmission 401 (i.e., a rotating disk for external connection, generally with a threaded hole) and the two side walls of the mounting opening 211 are screwed and fixed.

[0027] like Figure 2 and 5As shown, one end of the boom 6 is connected to the vehicle body and is controlled by the vehicle body to rotate or extend to drive the working platform 1 to adjust its position. The boom 6 includes a primary boom 61, a secondary boom 62 and a tertiary boom 63. The end of the primary boom 61 is connected to the vehicle body 5 to drive the secondary boom 62 and the tertiary boom 63 to rotate. The secondary boom 62 is sleeved on the tertiary boom 63. The primary boom 61 is sleeved on the secondary boom 62. The end of the tertiary boom 63 is fixedly connected to the end of the support arm 2. A telescopic hydraulic cylinder 64 is arranged in the chamber inside the primary boom 61, the secondary boom 62 and the tertiary boom 63. The telescopic hydraulic cylinder 64 It includes a fixed section 641, a first-level telescopic section 642 and a second-level telescopic section 643. One end of the fixed section 641 is connected to the end of the first-level boom 61, and the other end of the fixed section 641 is slidably connected to the first-level telescopic section 642 and sealed, so that the air pressure can push the first-level telescopic section 642. The end of the second-level telescopic section 643 is fixedly connected to the side wall of the third-level boom 63 through a pin shaft 644. When the second-level telescopic section 643 moves, it can drive the third-level boom 63 to move. The second-level boom 62 is telescoped and extended along with the movement of the third-level boom 63. The telescopic hydraulic cylinder 64 is a multi-stage hydraulic cylinder, which is a prior art and will not be described here.

[0028] like Figure 5As shown, a first limiting sleeve 611 is provided on the outer wall of the end of the first arm support 61, a first limiting slider 612 is provided inside the first limiting sleeve 611, the first limiting slider 612 is slidably matched with the outer wall of the second arm support 62, a second limiting slider 621 is provided at one end of the second arm support 62, the second limiting slider 621 is matched with the inner wall of the first arm support 61, a second limiting sleeve 622 is provided at the other end of the second arm support 62, the second limiting sleeve 622 is limitedly matched with the first limiting sleeve 611, and the second limiting sleeve 622 is limitedly matched with the first limiting sleeve 611. A third limiting slider 623 is provided on the inner side of the second limiting sleeve 622, and the third limiting slider 623 is slidably matched with the outer wall of the third-stage boom 63. A fourth limiting slider 632 is provided on the outer wall of one end of the third-stage boom 63, and the fourth limiting slider 632 is matched with the inner wall of the second-stage boom 3; when the telescopic hydraulic cylinder 64 is started, the second-stage telescopic section 642 drives the third-stage boom 63 to telescope and move, and the second-stage boom 62 moves adaptively with the movement of the third-stage boom 63, without the need for additional drive parts, and can follow It automatically extends to the maximum length as the third-stage boom 63 extends, and can automatically retract to the initial position as the third-stage boom 63 is retracted, reducing the setting of redundant components, effectively reducing the mass of the boom 6, and reducing the burden on the vehicle body 5 to maintain balance. When the secondary boom 62 moves, it is guided and supported by the second limit slider 621 and the third limit slider 623 at both ends, and slides between the primary boom 61 and the tertiary boom 63. The tertiary boom 63 is limitedly supported by the third limit slider 623 and the fourth limit slider 632, and is driven by the telescopic hydraulic cylinder 64 to perform a stable and smooth telescopic action. When retracting, the first limit sleeve 611 blocks the second limit sleeve 622 and the second limit slider 621 to achieve sliding limit of the secondary boom 62, and the second limit sleeve 622 blocks the fourth slider 632 and the connection between the end of the tertiary boom 63 and the support arm 2 to achieve sliding limit of the tertiary boom 63.

[0029] like Figure 5As shown, a first positioning block 631 located inside the secondary arm 62 is provided on the outer wall of the tertiary arm 63. When the tertiary arm 63 moves, the first positioning block 631 always moves inside the secondary arm 62 and is blocked and limited by the second limiting sleeve 622, so as to prevent the tertiary arm 63 from escaping from the secondary arm 62. One end of the first positioning support arm 2 connected with the tertiary arm 63 is sleeved on the side wall of the end of the tertiary arm 63. When the tertiary arm 63 is recovered, the end of the tertiary arm 63 is synchronously recovered with the support arm 2. Since the end of the support arm 2 is sleeved on the outer wall of the tertiary arm 63 An outer convex portion relative to the side wall of the tertiary arm frame 63 is formed at the end of the support arm 2, which can form a blocking structure with the second limiting sleeve 622, so that when the tertiary arm frame 63 is recovered, the second limiting sleeve 622 can be pushed by the end of the support arm 2, thereby driving the secondary arm frame 62 to be recovered synchronously. A second positioning block 624 located on the inner side of the primary arm frame 61 is provided on the outer wall of the secondary arm frame 62. When the secondary arm frame 62 moves, the second positioning block 624 always moves on the inner side of the primary arm frame 61 and is blocked and limited by the first limiting sleeve 611, thereby preventing the secondary arm frame 62 from escaping from the primary arm frame 61.

[0030] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. An aerial work vehicle, comprising a working platform (1), a support arm (2), a vehicle body (5) and an arm frame (6), wherein one end of the arm frame (6) is transmission-connected to the vehicle body (5), and the other end of the arm frame (6) is transmission-connected to the working platform (1) through the support arm (2), characterized in that: It also includes a slewing mechanism (3) arranged on the bottom surface of the working platform (1), a rotating mechanism (4) located below the slewing mechanism (3), and an outer shell (300), wherein the slewing mechanism (3) and the rotating mechanism (4) are integrated in the outer shell (300), the slewing mechanism (3) is connected to the working platform (1) and is used to drive the working platform (1) to rotate left and right, and the rotating mechanism (4) is connected to the support arm (2) and is used to drive the working platform (1) to rotate up and down.

2. The aerial work vehicle according to claim 1, characterized in that: The rotary mechanism (3) comprises a rotary worm gear transmission (301) and a rotary drive unit (302) for driving the rotary worm gear transmission (301); the output end of the rotary worm gear transmission (301) is connected to the working platform (1); and the rotary drive unit (302) is used to drive the rotary worm gear transmission (301) to rotate.

3. An aerial work vehicle according to claim 2, characterized in that: The rotating mechanism (4) comprises a rotating worm gear transmission (401) and a rotating driving unit (402) for driving the rotating worm gear transmission (401); an installation opening (211) is provided at the end of the support arm (2); the rotating worm gear transmission (401) is arranged in the installation opening (211); the rotating worm gear transmission (401) is fixed to the support arm; and the rotating driving unit (402) is used to drive the rotating worm gear transmission (401) to rotate.

4. The aerial work vehicle according to claim 3, characterized in that: The rotary drive unit (302) and the rotation drive unit (402) are drive motors or hydraulic motors.

5. The working platform of an aerial work vehicle according to claim 3, characterized in that: The support arm (2) comprises a mounting arm (21), an inclined arm (22) fixedly connected to the mounting arm (21), and an extension arm (23) fixedly connected to the inclined arm (22); the mounting opening (211) is provided at the end of the mounting arm (21).

6. The aerial work vehicle according to claim 1, characterized in that: The rotation direction of the rotating mechanism (3) is perpendicular to the rotation direction of the rotating mechanism (4).

7. The aerial work vehicle according to claim 1, characterized in that: The arm (6) comprises a primary arm (61), a secondary arm (62) and a tertiary arm (63) which can rotate up and down relative to the vehicle body (5); the secondary arm (62) is sleeved on the outer wall of the tertiary arm (63); the primary arm (61) is sleeved on the secondary arm (62); and a telescopic hydraulic cylinder (64) is provided inside the primary arm (61) for driving the tertiary arm (63) to move along the length direction.

8. The aerial work vehicle according to claim 7, characterized in that: The telescopic hydraulic cylinder (64) comprises a fixed section (641) connected to the end of the primary boom (61), a primary telescopic section (642) connected to the fixed section (641), and a secondary telescopic section (643) connected to the primary telescopic section (642); the end of the secondary telescopic section (643) is connected to the side wall of the tertiary boom (63) via a pin shaft (644).

9. The aerial work vehicle according to claim 8, characterized in that: A first limiting sleeve (611) is provided on the outer wall of the end of the first-stage arm support (61), a first limiting slider (612) is provided on the inner side of the first limiting sleeve (611) and is slidably matched with the outer wall of the second-stage arm support (62), one end of the second-stage arm support (62) is provided with a second limiting slider (621) matched with the inner wall of the first-stage arm support (61), the other end of the second-stage arm support (62) is provided with a second limiting sleeve (622) matched with the first limiting sleeve (611), the inner side of the second limiting sleeve (622) is provided with a third limiting slider (623) slidably matched with the outer wall of the third-stage arm support (63), a fourth limiting slider (632) is provided on the outer wall of one end of the third-stage arm support (63) and is matched with the inner wall of the second-stage arm support (62), and the other end of the third-stage arm support (63) is connected to the end of the support arm (2).

10. The aerial work vehicle according to claim 8, characterized in that: A first positioning block (631) located inside the secondary arm (62) is provided on the outer wall of the third-stage arm (63); one end of the support arm (2) connected to the third-stage arm (63) is sleeved on the end side wall of the third-stage arm (63); and a second positioning block (624) located inside the first-stage arm (61) is provided on the outer wall of the second-stage arm (62).

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