CN111086961A - Crank arm lifting structure of crank arm type aerial work platform truck - Google Patents
Crank arm lifting structure of crank arm type aerial work platform truck Download PDFInfo
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- CN111086961A CN111086961A CN202010061274.7A CN202010061274A CN111086961A CN 111086961 A CN111086961 A CN 111086961A CN 202010061274 A CN202010061274 A CN 202010061274A CN 111086961 A CN111086961 A CN 111086961A
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- 230000000694 effects Effects 0.000 description 2
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- 229910000838 Al alloy Inorganic materials 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
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Abstract
The utility model provides a crank arm lifting structure of crank arm type aerial work platform truck, including installing in the rotating base of vehicle chassis top, first crank arm, first connecting rod, first connecting block, the second crank arm, the second connecting rod, the second connecting block, the third crank arm, the third connecting block, the fourth crank arm, the fourth connecting rod, the fourth connecting block, lift platform, first crank arm and first connecting rod swing joint are between rotating base and first connecting block, second crank arm and second connecting rod swing joint are between first connecting block and second connecting block, third crank arm swing joint is between second connecting block and third connecting block, fourth crank arm and fourth connecting rod swing joint are between third connecting block and fourth connecting block. The double-parallelogram crank arm structure with crossed connecting rods is adopted, the height of the crank arm is lower in a folded state while the stability is ensured, and the telescopic crank arm and the single-parallelogram crank arm are further connected to the double-parallelogram crank arm, so that the lifting height of the operation platform is ensured.
Description
Technical Field
The invention relates to the field of aerial work platform trucks, in particular to a crank arm lifting structure of a crank arm type aerial work platform truck.
Background
An aerial work platform (aeronautical work platform) is a movable aerial work product for serving aerial work, equipment installation, maintenance and the like in various industries. The related products of the aerial work platform mainly comprise: a scissor type aerial work platform, a vehicle-mounted aerial work platform, a crank arm type aerial work platform, a self-propelled aerial work platform, an aluminum alloy aerial work platform and a telescopic cylinder type aerial work platform.
The crank arm type lifting device of the aerial work platform sequentially hinges a plurality of connecting arms together through connecting pieces, and the connecting arms are jacked up by the oil cylinders to enable the connecting arms to tilt upwards, so that the aim of lifting the work platform is fulfilled; at present, a plurality of crank arms adopt connecting rods to form a parallelogram, so that the stability is higher, but the parallelogram structure enables the crank arms to occupy higher height after being folded, and the condition of exceeding the vehicle height limit standard exists after adopting a plurality of sections of crank arms.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a crank arm lifting structure of a crank arm type aerial work platform truck, which adopts a double-parallelogram crank arm structure with crossed connecting rods, ensures the stability and simultaneously ensures that the crank arm is lower in height when in a folded state, and the crank arm of the double-parallelogram crank arm is also connected with a telescopic crank arm and a single-parallelogram crank arm, thereby ensuring the lifting height of a work platform.
The specific technical scheme of the invention is as follows: the utility model provides a crank arm lifting structure of crank arm type aerial work platform truck, is including installing in the rotating base of vehicle chassis top, first crank arm, first connecting rod, first connecting block, the second crank arm, second connecting rod, second connecting block, the third crank arm, the third connecting block, the fourth crank arm, fourth connecting rod, fourth connecting block, lift platform, first crank arm with first connecting rod swing joint in rotating base with between the first connecting block, the second crank arm with second connecting rod swing joint in first connecting block with between the second connecting block, the third crank arm swing joint in the second connecting block with between the third connecting block, the fourth crank arm with fourth connecting rod swing joint in the third connecting block with between the fourth connecting block, lift platform with the fourth connecting block is connected.
Therefore, the lifting platform has the lifting function under the action of the first crank arm, the second crank arm, the third crank arm and the fourth crank arm, and the space of the vehicle when the lifting platform is in a descending state can be reduced due to the crossing and stretching functions of the first crank arm, the second crank arm, the third crank arm and the fourth crank arm.
Preferably, the first crank arm, the first connecting rod and the rotating base are respectively hinged to a first hinge hole and a second hinge hole, the first crank arm, the first connecting rod and the first connecting block are respectively hinged to a third hinge hole and a fourth hinge hole, the first crank arm and the first connecting rod are installed in parallel, and the first hinge hole, the second hinge hole, the third hinge hole and the fourth hinge hole enclose a parallelogram.
Therefore, the first hinge hole, the second hinge hole, the third hinge hole and the fourth hinge hole enclose a parallelogram, and the first connecting block can be horizontally moved and lifted.
Preferably, the second crank arm, the second connecting rod and the first connecting block are respectively hinged to a fifth hinge hole and a sixth hinge hole, the second crank arm, the second connecting rod and the second connecting block are respectively hinged to a seventh hinge hole and an eighth hinge hole, the second crank arm and the second connecting rod are installed in parallel, and the fifth hinge hole, the sixth hinge hole, the seventh hinge hole and the eighth hinge hole enclose a parallelogram.
Therefore, the parallelogram is enclosed by the fifth hinge hole, the sixth hinge hole, the seventh hinge hole and the eighth hinge hole, so that the second connecting block can be horizontally moved and lifted.
Preferably, the third hinge hole, the sixth hinge hole, the fourth hinge hole and the fifth hinge hole in the first connecting block are arranged from bottom to top.
Therefore, the first connecting rod and the second connecting rod are hinged on the first connecting block in a crossed mode, when the first crank arm and the second crank arm are lowered to the bottom, the second connecting rod is located below the first connecting rod, the distance between the first crank arm and the second crank arm is smaller, and the overall height of the vehicle in a crank arm folding state is reduced.
Preferably, a second crank arm connecting seat is fixedly connected to the lower portion of the second crank arm, and the second crank arm connecting seat is connected with the sixth hinge hole through a first driving oil cylinder.
Therefore, the telescopic action of the first driving oil cylinder can drive the second crank arm to rotate, and the double-parallelogram structure formed by the first crank arm, the first connecting rod, the second crank arm and the second connecting rod can enable the rotation angle of the first crank arm to be the same as that of the second crank arm, so that the first crank arm and the second crank arm can synchronously rotate and lift.
Preferably, the third crank arm and the second connecting block are hinged to a ninth hinge hole, a third crank arm connecting seat is fixedly connected to the lower portion of the third crank arm, the third crank arm connecting seat and the second connecting block are connected through a second driving oil cylinder, and the second driving oil cylinder and the second connecting block are hinged to a tenth hinge hole.
Therefore, the ninth hinge hole, the tenth hinge hole and the hinge hole of the second driving oil cylinder on the third crank arm connecting seat form a triangle, and the third crank arm can rotate to lift under the telescopic action of the second driving oil cylinder.
Preferably, the third crank arm is a telescopic arm and comprises a fixed section and a telescopic section, the fixed section and the telescopic section are driven by a drag chain to be telescopic, the third crank arm connecting seat is fixedly connected to the fixed section, and the telescopic section is hinged to the third connecting block.
Therefore, the telescopic section of the third crank arm can extend out relative to the fixed section under the action of the drag chain, so that the third crank arm is lengthened, and the highest lifting height of the lifting platform is lifted.
Preferably, a passive leveling cylinder is connected between the fixed section and the second connecting block, and an active leveling cylinder is connected between the telescopic section and the third connecting block.
Therefore, the oil inlet and the oil return port of the passive leveling cylinder are respectively connected with the oil inlet and the oil return port of the active leveling cylinder through oil pipes, the extension length of the piston rod is changed in the rotation lifting process of the third crank arm by the passive leveling cylinder, so that oil enters and exits from the oil inlet and the oil return port of the active leveling cylinder, the piston rod of the active leveling cylinder stretches, the third connecting block is enabled to be kept in a translation state and not to rotate all the time, and the leveling effect is achieved.
Preferably, the fourth crank arm, the fourth connecting rod and the third connecting block are respectively hinged to an eleventh hinge hole and a twelfth hinge hole, the fourth crank arm, the fourth connecting rod and the fourth connecting block are respectively hinged to a thirteenth hinge hole and a fourteenth hinge hole, the fourth crank arm and the fourth connecting rod are installed in parallel, and the eleventh hinge hole, the twelfth hinge hole, the thirteenth hinge hole and the fourteenth hinge hole enclose a parallelogram.
Therefore, the fourth connecting block and the third connecting block are connected through the fourth crank arm and the fourth connecting rod which form a parallelogram, and the fourth connecting block is guaranteed to be lifted and always kept in a translation state.
Preferably, a fourth crank arm connecting seat is fixedly connected to the lower portion of the fourth crank arm, and the fourth crank arm connecting seat is connected with the fourteenth hinge hole through a third driving oil cylinder.
Therefore, the fourth crank arm can rotate to lift under the telescopic action of the third driving oil cylinder.
In conclusion, the invention has the following beneficial effects:
the crank arm lifting structure of the crank arm type aerial work platform vehicle adopts a double-parallelogram crank arm structure with crossed connecting rods, ensures the stability, simultaneously ensures that the crank arm is lower in height in a retracted state, and ensures the lifting height of a work platform by connecting the telescopic crank arm and the single-parallelogram crank arm on the crank arm of the double-parallelogram.
Drawings
FIG. 1 is a front view of a double parallelogram crank arm formed by a first crank arm and a second crank arm of the crank arm lifting structure of the crank arm type aerial work platform truck of the invention when the crank arm is folded;
FIG. 2 is a front view of a crank arm lifting structure of the crank arm type aerial work platform truck of the present invention, wherein a double parallelogram crank arm composed of a first crank arm and a second crank arm is lifted and a fourth crank arm is lifted;
in the figure, 1-rotating base, 1 a-first hinge hole, 1 b-second hinge hole, 2-first crank arm, 3-first connecting rod, 4-first connecting block, 4 a-third hinge hole, 4 b-fourth hinge hole, 4 c-fifth hinge hole, 4 d-sixth hinge hole, 5-second crank arm, 51-second crank arm connecting seat, 6-second connecting rod, 7-second connecting block, 7 a-seventh hinge hole, 7 b-eighth hinge hole, 7 c-ninth hinge hole, 7 d-tenth hinge hole, 8-third crank arm, 81-third crank arm connecting seat, 82-fixed section, 83-telescopic section, 84-drag chain, 9-third connecting block, 9 a-eleventh hinge hole, 9 b-twelfth hinge hole, 9 c-ninth hinge hole, 9 d-twelfth hinge hole, and the like, 10-a fourth crank arm, 101-a fourth crank arm connecting seat, 11-a fourth connecting rod, 12-a fourth connecting block, 12 a-a thirteenth hinge hole, 12 b-a fourteenth hinge hole, 13-a lifting platform, 14-a first driving oil cylinder, 15-a second driving oil cylinder, 16-a passive leveling oil cylinder, 17-an active leveling oil cylinder and 18-a third driving oil cylinder.
Detailed Description
The invention will be further explained by means of specific embodiments with reference to the drawings.
Referring to fig. 1 and 2, a crank arm lifting structure of a crank arm type aerial work platform truck comprises a rotating base 1 arranged above a vehicle chassis, a first crank arm 2, a first connecting rod 3, a first connecting block 4, a second crank arm 5 and a second connecting rod 6, second connecting block 7, third crank arm 8, third connecting block 9, fourth crank arm 10, fourth connecting rod 11, fourth connecting block 12, lift platform 13, first crank arm 2 and 3 swing joint of first connecting rod between rotating base 1 and first connecting block 4, second crank arm 5 and 6 swing joint of second connecting rod between first connecting block 4 and second connecting block 7, 8 swing joint of third crank arm between second connecting block 7 and third connecting block 9, fourth crank arm 10 and 11 swing joint of fourth connecting rod between third connecting block 9 and fourth connecting block 12, lift platform 13 is connected with fourth connecting block 12.
Therefore, the lifting platform 13 has a lifting function under the action of the first crank arm 2, the second crank arm 5, the third crank arm 8 and the fourth crank arm 10, and the crossing and stretching functions of the first crank arm 2, the second crank arm 5, the third crank arm 8 and the fourth crank arm 10 can reduce the space of the vehicle when the lifting platform 13 is in a descending state.
As shown in fig. 1 and 2, the first crank arm 2 and the first link rod 3 are respectively hinged to the first hinge hole 1a and the second hinge hole 1b with the rotating base 1, the first crank arm 2 and the first link rod 3 are respectively hinged to the third hinge hole 4a and the fourth hinge hole 4b with the first connecting block 4, and the first crank arm 2 and the first link rod 3 are installed in parallel and the first hinge hole 1a, the second hinge hole 1b, the third hinge hole 4a and the fourth hinge hole 4b enclose a parallelogram.
Therefore, the first hinge hole 1a, the second hinge hole 1b, the third hinge hole 4a and the fourth hinge hole 4b enclose a parallelogram, so that the first connecting block 4 can be moved in a translational manner.
As shown in fig. 1 and 2, the second crank arm 5 and the second connecting rod 6 are respectively hinged to the fifth hinge hole 4c and the sixth hinge hole 4d with the first connecting block 4, the second crank arm 5 and the second connecting rod 6 are respectively hinged to the seventh hinge hole 7a and the eighth hinge hole 7b with the second connecting block 7, the second crank arm 5 and the second connecting rod 6 are installed in parallel, and the fifth hinge hole 4c, the sixth hinge hole 4d, the seventh hinge hole 7a and the eighth hinge hole 7b enclose a parallelogram.
Therefore, the parallelogram surrounded by the fifth hinge hole 4c, the sixth hinge hole 4d, the seventh hinge hole 7a and the eighth hinge hole 7b can enable the second connecting block 7 to move up and down.
As shown in fig. 1 and 2, the third hinge hole 4a, the sixth hinge hole 4d, the fourth hinge hole 4b and the fifth hinge hole 4c of the first connecting block 4 are arranged from bottom to top.
Therefore, the first connecting rod 3 and the second connecting rod 6 are hinged on the first connecting block 4 in a crossed mode, when the first crank arm 2 and the second crank arm 5 are lowered to the bottom, the second connecting rod 6 is located below the first connecting rod 3, the distance between the first crank arm 2 and the second crank arm 5 is smaller, and the overall height of the vehicle in the crank arm folding state is reduced.
As shown in fig. 1 and 2, a second crank arm connecting seat 51 is fixedly connected to the lower portion of the second crank arm 5, and the second crank arm connecting seat 51 is connected to the sixth hinge hole 4d through the first driving cylinder 14.
Therefore, the telescopic action of the first driving oil cylinder 14 can drive the second crank arm 5 to rotate, and the double-parallelogram structure formed by the first crank arm 2, the first connecting rod 3, the second crank arm 5 and the second connecting rod 6 can enable the rotation angle of the first crank arm 2 to be the same as that of the second crank arm 5, so that the synchronous rotation lifting of the first crank arm 2 and the second crank arm 5 is realized.
As shown in fig. 1 and 2, the third crank arm 8 and the second connecting block 7 are hinged to the ninth hinge hole 7c, a third crank arm connecting seat 81 is fixedly connected to the lower portion of the third crank arm 8, the third crank arm connecting seat 81 and the second connecting block 7 are connected through a second driving oil cylinder 15, and the second driving oil cylinder 15 and the second connecting block 7 are hinged to the tenth hinge hole 7 d.
Therefore, the ninth hinge hole 7c, the tenth hinge hole 7d and the hinge hole of the second driving oil cylinder 15 on the third crank arm connecting seat 81 form a triangle, and the third crank arm 8 can rotate to lift under the telescopic action of the second driving oil cylinder 15.
As shown in fig. 1 and 2, the third crank arm 8 is a telescopic arm, and includes a fixed section 82 and a telescopic section 83, the fixed section 82 and the telescopic section 83 are driven by a drag chain 84 to extend and retract, the third crank arm connecting seat 81 is fixedly connected to the fixed section 82, and the telescopic section 83 is hinged to the third connecting block 9.
Therefore, the telescopic section 83 of the third crank arm 8 can extend out relative to the fixed section 82 under the action of the drag chain 84, so that the third crank arm 8 is lengthened, and the highest lifting height of the lifting platform 13 is improved.
As shown in fig. 1 and 2, a passive leveling cylinder 16 is further connected between the fixed section 82 and the second connecting block 7, and an active leveling cylinder 17 is connected between the telescopic section 83 and the third connecting block 9.
Therefore, an oil inlet and an oil return port of the passive leveling cylinder 16 are respectively connected with an oil inlet and an oil return port of the active leveling cylinder 17 through oil pipes, the passive leveling cylinder 16 realizes the change of the extension length of a piston rod in the rotating and lifting process of the third crank arm 8, so that oil enters and exits from the oil inlet and the oil return port of the active leveling cylinder 17, the piston rod of the active leveling cylinder 17 is stretched, the third connecting block 9 is always kept in a translation state and does not rotate, and the leveling effect is realized.
As shown in fig. 1 and 2, the fourth crank arm 10 and the fourth link 11 are respectively hinged to the eleventh hinge hole 9a and the twelfth hinge hole 9b with the third connecting block 9, the fourth crank arm 10 and the fourth link 11 are respectively hinged to the thirteenth hinge hole 12a and the fourteenth hinge hole 12b with the fourth connecting block 12, the fourth crank arm 10 and the fourth link 11 are installed in parallel, and the eleventh hinge hole 9a, the twelfth hinge hole 9b, the thirteenth hinge hole 12a and the fourteenth hinge hole 12b enclose a parallelogram.
Therefore, the fourth connecting block 12 and the third connecting block 9 are connected through the fourth crank arm 10 and the fourth connecting rod 11 which form a parallelogram, and the lifting of the fourth connecting block 12 is always kept in a translation state.
As shown in fig. 1 and 2, a fourth crank arm connecting seat 101 is fixedly connected to the lower portion of the fourth crank arm 10, and the fourth crank arm connecting seat 101 is connected to the fourteenth hinge hole 12b through a third driving cylinder 18.
Thereby, the fourth crank arm 10 is rotationally lifted and lowered by the expansion and contraction of the third drive cylinder 18.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (10)
1. The utility model provides a crank arm formula aerial work platform truck crank arm lift structure which characterized in that: including install in rotating base (1) of vehicle chassis top, first crank arm (2), first connecting rod (3), first connecting block (4), second crank arm (5), second connecting rod (6), second connecting block (7), third crank arm (8), third connecting block (9), fourth crank arm (10), fourth connecting rod (11), fourth connecting block (12), lift platform (13), first crank arm (2) with first connecting rod (3) swing joint in rotating base (1) with between first connecting block (4), second crank arm (5) with second connecting rod (6) swing joint in first connecting block (4) with between second connecting block (7), third crank arm (8) swing joint in second connecting block (7) with between third connecting block (9), fourth crank arm (10) with fourth connecting rod (11) swing joint in third connecting block (9) with institute And the lifting platform (13) is connected with the fourth connecting blocks (12) among the fourth connecting blocks (12).
2. The crank arm lifting structure of the crank arm type aerial work platform truck of claim 1, wherein: the first crank arm (2) and the first connecting rod (3) are respectively hinged to a first hinge hole (1 a) and a second hinge hole (1 b) with the rotating base (1), the first crank arm (2) and the first connecting rod (3) are respectively hinged to a third hinge hole (4 a) and a fourth hinge hole (4 b) with the first connecting block (4), and the first crank arm (2) and the first connecting rod (3) are installed in parallel, and the first hinge hole (1 a), the second hinge hole (1 b), the third hinge hole (4 a) and the fourth hinge hole (4 b) enclose a parallelogram.
3. The crank arm lifting structure of the crank arm type aerial work platform truck of claim 2, wherein: the second crank arm (5) and the second connecting rod (6) are respectively hinged to a fifth hinge hole (4 c) and a sixth hinge hole (4 d) with the first connecting block (4), the second crank arm (5) and the second connecting rod (6) are respectively hinged to a seventh hinge hole (7 a) and an eighth hinge hole (7 b) with the second connecting block (7), and the second crank arm (5) and the second connecting rod (6) are installed in parallel, and the fifth hinge hole (4 c), the sixth hinge hole (4 d), the seventh hinge hole (7 a) and the eighth hinge hole (7 b) enclose a parallelogram.
4. The crank arm lifting structure of the crank arm type aerial work platform truck of claim 3, wherein: the third hinge hole (4 a), the sixth hinge hole (4 d), the fourth hinge hole (4 b) and the fifth hinge hole (4 c) in the first connecting block (4) are arranged from bottom to top.
5. The crank arm lifting structure of the crank arm type aerial work platform truck of claim 4, wherein: and a second crank arm connecting seat (51) is fixedly connected to the lower part of the second crank arm (5), and the second crank arm connecting seat (51) is connected with the sixth hinge hole (4 d) through a first driving oil cylinder (14).
6. The crank arm lifting structure of the crank arm type aerial work platform truck of claim 1, wherein: the third crank arm (8) and the second connecting block (7) are hinged to a ninth hinge hole (7 c), a third crank arm connecting seat (81) is fixedly connected to the lower portion of the third crank arm (8), the third crank arm connecting seat (81) and the second connecting block (7) are connected through a second driving oil cylinder (15), and the second driving oil cylinder (15) and the second connecting block (7) are hinged to a tenth hinge hole (7 d).
7. The crank arm lifting structure of the crank arm type aerial work platform truck of claim 6, wherein: the third is bent arm (8) and is flexible arm, including canned paragraph (82) and flexible section (83), canned paragraph (82) with it is flexible to drive by tow chain (84) between flexible section (83), just the third is bent arm connecting seat (81) rigid coupling in canned paragraph (82), flexible section (83) with third connecting block (9) are articulated.
8. The crank arm lifting structure of the crank arm type aerial work platform truck of claim 7, wherein: the fixed section (82) and a passive leveling cylinder (16) are further connected between the second connecting blocks (7), and the telescopic section (83) and a driving leveling cylinder (17) are connected between the third connecting blocks (9).
9. The crank arm lifting structure of the crank arm type aerial work platform truck of claim 8, wherein: the fourth crank arm (10) and the fourth connecting rod (11) are respectively hinged to an eleventh hinge hole (9 a) and a twelfth hinge hole (9 b) together with the third connecting block (9), the fourth crank arm (10) and the fourth connecting rod (11) are respectively hinged to a thirteenth hinge hole (12 a) and a fourteenth hinge hole (12 b) together with the fourth connecting block (12), the fourth crank arm (10) and the fourth connecting rod (11) are installed in parallel, and the eleventh hinge hole (9 a), the twelfth hinge hole (9 b), the thirteenth hinge hole (12 a) and the fourteenth hinge hole (12 b) enclose a parallelogram.
10. The crank arm lifting structure of the crank arm type aerial work platform truck of claim 9, wherein: a fourth crank arm connecting seat (101) is fixedly connected to the lower portion of the fourth crank arm (10), and the fourth crank arm connecting seat (101) is connected with the fourteenth hinge hole (12 b) through a third driving oil cylinder (18).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010061274.7A CN111086961A (en) | 2020-01-19 | 2020-01-19 | Crank arm lifting structure of crank arm type aerial work platform truck |
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| CN202010061274.7A CN111086961A (en) | 2020-01-19 | 2020-01-19 | Crank arm lifting structure of crank arm type aerial work platform truck |
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| CN107986206A (en) * | 2017-12-28 | 2018-05-04 | 徐州海伦哲专用车辆股份有限公司 | A kind of mixing arm type high-altitude operation vehicle of multifreedom motion |
| CN109650303A (en) * | 2018-12-14 | 2019-04-19 | 中联重科股份有限公司 | Aloft-work mechanical arm declines control method and device, aloft-work mechanical arm |
| CN110642198A (en) * | 2019-10-28 | 2020-01-03 | 江苏东迈重工机械有限公司 | Overload-prevention lifting mechanism and control method thereof |
| CN211664680U (en) * | 2020-01-19 | 2020-10-13 | 浙江鼎力机械股份有限公司 | Crank arm lifting structure of crank arm type aerial work platform truck |
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