CN204980952U - Fixed leg structure, frame and wheel crane - Google Patents
Fixed leg structure, frame and wheel crane Download PDFInfo
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- CN204980952U CN204980952U CN201520642044.4U CN201520642044U CN204980952U CN 204980952 U CN204980952 U CN 204980952U CN 201520642044 U CN201520642044 U CN 201520642044U CN 204980952 U CN204980952 U CN 204980952U
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Abstract
The utility model discloses a fixed leg structure, frame and wheel crane relates to engineering machinery for realize the reliability and the lightweight of fixed leg structure. This fixed leg structure includes preceding riser subassembly, middle riser subassembly and back riser subassembly, one of them board subassembly is formed by the dull and stereotyped welding of the polylith of different thickness in preceding riser subassembly, middle riser subassembly and the back riser subassembly, each flat plate thickness is confirmed by the magnitude of load that it bore the weight of. Above -mentioned technical scheme according to the atress size at different positions, arranges that the board of different riser subassemblies is thick, and every riser subassembly is formed by two or the different panel butt joint of polylith thickness to the performance that makes every bulk material can both obtain full play, realizes reliability and light -weighted unity.
Description
Technical field
The utility model relates to engineering machinery field, is specifically related to a kind of fixed supporting leg structure, vehicle frame and wheel crane.
Background technology
In recent years, China's crane industry obtains fast development, has entered relative fast speed developing period.But generally, China's crane product structure is comparatively heavy, greatly, discharge amount of exhaust gas is large for material and energy-output ratio.For head it off, promote China's crane product competitiveness, light-weight design has become problem demanding prompt solution in the industry.
On the other hand, China's Eleventh Five-Year Plan proposes the target of energy-saving and emission-reduction, and lightweight is conducive to reducing the energy needed for drive element, reduces exhaust emission, reduces operating noise.
The feature of wheel crane to utilize tire device, moves along trackless road surface.Vehicle frame is its walking matrix, and supporting connects each parts of hoisting crane, and bears from the inside and outside various load of car.Meanwhile, load-carrying ability during in order to increase Wheel Crane's Weight Lifting Operation and working stability, must arrange support leg mechanism.Support leg mechanism requires firm reliable, flexible convenient.Regain or dismantle during support leg mechanism driving; During work, overhanging support ground, erects whole hoisting crane.
As shown in Figure 1, when the operation of wheel crane lift heavy, the various load of bearing are passed to fixed supporting leg by vehicle frame back segment 3 by vehicle frame, finally arrive ground.At present, the H formula body frame structure for automotive that wheel crane adopts as shown in Figure 1, mainly comprises front section of vehicle frame 1, front fixed supporting leg 2, vehicle frame back segment 3, pivoting support 4, rear fixed supporting leg 6, movable supporting legs 5.When hoisting crane hoisting operation, power is delivered on vehicle frame back segment 3 by pivoting support 4 by derricking gear, whole vehicle frame back segment 3 all bearing loads; Power reaches movable supporting legs 5 by front fixed supporting leg 2, rear fixed supporting leg 6 again, finally arrives ground.In stressed transmittance process, fixed supporting leg directly to be contacted with movable supporting legs 5 with overlap joint block by door-plate and realizes transmitting.And in whole fixed supporting leg structure, door-plate is directly connected with riser again with overlap joint block, therefore fixed supporting leg riser is one of main stressed part, and the structural strength of riser affects whole fixed supporting leg reliability of structure.
At present, on the hoister in large tonnage of H type leg structure, fixed supporting leg three pieces of risers are one block of whole plate, fixed supporting leg reliability of structure during in order to ensure crane job, according to fixed supporting leg riser stressed maximum position design thickness of slab, the version of fixed supporting leg is as follows: part more than inter panel is called upper box, part below inter panel is lower box, the fixed supporting leg upper box of this kind of form improves intensity and the rigidity of upper box by increasing longitudinal brace panel, upper box structure unstability when preventing crane job.
Contriver finds, at least there is following problems: the structure of existing fixed supporting leg is comparatively heavy, need a kind of fixed supporting leg that simultaneously can meet reliability and lightweight requirements at present badly in prior art.
Utility model content
One of them object of the present utility model proposes a kind of fixed supporting leg structure, vehicle frame and wheel crane, in order to realize fixed supporting leg reliability of structure and lightweight.
For achieving the above object, the utility model provides following technical scheme:
The utility model provides a kind of fixed supporting leg structure, comprises front vertical plate assembly, middle riser assembly and back vertical plate assembly; In described front vertical plate assembly, described middle riser assembly and described back vertical plate assembly, one of them described board component is formed by the polylith plate welding of different-thickness;
The magnitude of load that the thickness of each described flat board is carried by it is determined.
Fixed supporting leg structure as above, preferably, described front vertical plate assembly comprises the first front vertical plate and the second front vertical plate, weld between described first front vertical plate and described second front vertical plate, described first front vertical plate is near the door-plate of described fixed supporting leg structure, and the thickness of described first front vertical plate is greater than the thickness of described second front vertical plate.
Fixed supporting leg structure as above, preferably, the weld seam between described first front vertical plate and described second front vertical plate is curve-like along its length.
Fixed supporting leg structure as above, preferably, described middle riser assembly comprises the first middle riser, the second middle riser, the 3rd middle riser and the 4th middle riser;
Described second middle riser is between described first middle riser and described 3rd middle riser, described 4th middle riser is also between described first middle riser and described 3rd middle riser, and described 4th middle riser is positioned at below described second middle riser;
Three limits of described 4th middle riser are welded with described first middle riser, described second middle riser and described 3rd middle riser respectively; The both sides of the second middle riser are welded with described first middle riser and described 3rd middle riser respectively;
Wherein, described first middle riser and described 3rd middle riser are near the door-plate of described fixed supporting leg structure, described 4th middle riser is near the overlap joint block of described fixed supporting leg structure, and the thickness of described second middle riser is less than the thickness of described first middle riser, described 3rd middle riser and described 4th middle riser.
Fixed supporting leg structure as above, preferably, described 4th middle riser and described first middle riser, weld seam between described second middle riser and described 3rd middle riser are linearity along its length, and the second middle riser and the weld seam between described first middle riser and described 3rd middle riser are linearity along its length.
Fixed supporting leg structure as above, preferably, described back vertical plate assembly comprises the first back vertical plate and the second back vertical plate, weld between described first back vertical plate and described second back vertical plate, described first back vertical plate is near the door-plate of described fixed supporting leg structure, and the thickness of described first back vertical plate is greater than the thickness of described second back vertical plate.
Fixed supporting leg structure as above, preferably, the weld seam between described first back vertical plate and described second back vertical plate is arc shaped along its length.
Fixed supporting leg structure as above, preferably, fixed supporting leg structure also comprises horizontal brace panel and at least two pieces of longitudinal brace panels;
Wherein one end and the described middle riser assembly of each described longitudinal brace panel are fixed, and the other end of each described longitudinal brace panel and described front vertical plate assembly or described back vertical plate assembly are fixed;
The two ends of described horizontal brace panel respectively with one piece described longitudinal brace panel fix.
The utility model also provides a kind of vehicle frame, and it comprises the fixed supporting leg structure that the arbitrary technical scheme of the utility model provides.
The utility model provides again a kind of wheel crane, and it comprises the vehicle frame that the arbitrary technical scheme of the utility model provides.
Based on technique scheme, the utility model embodiment at least can produce following technique effect: in fixed supporting leg structure, each riser assembly is main force-summing element, must ensure that it has enough intensity, just can guarantee the reliability of complete vehicle structure, riser assembly is the element that in fixed supporting leg structure, face area is maximum simultaneously, and riser thickness of slab has a significant impact fixed supporting leg structural weight.One of them comprises the different polylith flat board of thickness with in back vertical plate assembly for front vertical plate assembly, middle riser assembly, and the magnitude of load that the thickness of each flat board is carried by each flat board is determined.More preferably, front vertical plate assembly, middle riser assembly, back vertical plate assembly form by thin, slab docking: the thickness of slab arranging different riser assemblies according to the stressed size of different parts, every block riser assembly is docked by two pieces or the different sheet material of polylith thickness and forms, thus the performance of every block of material can be not fully exerted, realize reliability and weight-saving unification.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, and form a application's part, schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the schematic diagram of the H formula body frame structure for automotive that in prior art, wheel crane adopts;
The schematic diagram of the fixed supporting leg structure that Fig. 2 provides for the utility model embodiment;
Fig. 3 is the structural representation of front vertical plate assembly in Fig. 2;
Fig. 4 is the structural representation of middle riser assembly in Fig. 2;
Fig. 5 is the structural representation of back vertical plate assembly in Fig. 2.
Detailed description of the invention
Below in conjunction with the elaboration that Fig. 2 ~ Fig. 5 carries out specifically to the technical scheme that the utility model provides.
Term herein or Name Resolution.
Wheel crane: utilize tire device, can carry at band or move along trackless road surface under no-load condition, rely on the hoisting crane that deadweight keeps stable.
Vehicle frame: the major bearing structures of crane descending, in order to place and to fix other parts.
Fixed supporting leg: be shaped by sheet material welding, for connecting the box-structure of movable supporting legs and vehicle frame.
Movable supporting legs: be shaped by sheet material welding, can stretch back and forth, for supporting the box-structure of heavy-duty machine.
H formula supporting leg: every platform car hosit has four movable supporting legs, in H-shaped after movable supporting legs is overhanging.
Longitudinally: be parallel to vehicle frame length direction.
Laterally: perpendicular to vehicle frame length direction.
Distribution of stress: the situation that during crane job, framing member is stressed.
See Fig. 2, the utility model embodiment provides a kind of fixed supporting leg structure, comprises front vertical plate assembly 21, middle riser assembly 22 and back vertical plate assembly 23; In front vertical plate assembly 21, middle riser assembly 22 and back vertical plate assembly 23, one of them board component is formed by the polylith plate welding of different-thickness.The magnitude of load that the thickness of each flat board is carried by it is determined.The polylith flat board of indication refers to the flat board of more than two pieces and two pieces herein.
Fixed supporting leg structure is the box-structure formed primarily of inter panel 27, the welding of overlap joint block 25, front vertical plate assembly 21, middle riser assembly 22 and back vertical plate assembly 23.In fixed supporting leg structure, each riser assembly is main force-summing element, must ensure that it has enough intensity, just can guarantee the reliability of complete vehicle structure, riser assembly is the element that in fixed supporting leg structure, face area is maximum simultaneously, and riser thickness of slab has a significant impact fixed supporting leg structural weight.One of them comprises the different polylith flat board of thickness with in back vertical plate assembly 23 for front vertical plate assembly 21, middle riser assembly 22, and the magnitude of load that the thickness of each flat board is carried by each flat board is determined.More preferably, front vertical plate assembly 21, middle riser assembly 22, back vertical plate assembly 23 form by thin, slab docking: the thickness of slab arranging different riser assemblies according to the stressed size of different parts, every block riser assembly is docked by two pieces or the different sheet material of polylith thickness and forms, thus the performance of every block of material can be not fully exerted, realize reliability and weight-saving unification.
So, whole fixed supporting leg reliability of structure can be ensured on the one hand, meet its load bearing requirements; On the other hand, because the region that bearing load is little takes the less flat board of thickness, compared with the fixed supporting leg structure all adopting same thickness, weight is alleviated, and meets the requirement of product weight-saving.
In the process of crane job, the stressed difference of different parts of fixed supporting leg each riser assembly, with door-plate 24, to overlap the region that block 25 is directly connected stressed comparatively large, and other regions are stressed less.Stress gradient according to each riser assembly of fixed supporting leg distributes, according to the thickness of slab of the principle of equal strength appropriate design each riser assembly middle plateform, adopt the riser form of thin thick plate docking, give full play to material property, avoid waste of material, while ensureing structural strength, reduce material cost and structural weight.
See Fig. 2 and Fig. 3, front vertical plate assembly 21 comprises the first front vertical plate 211 and the second front vertical plate 212, weld between first front vertical plate 211 and the second front vertical plate 212, the first front vertical plate 211 is greater than the thickness of the second front vertical plate 212 near the thickness of door-plate 24, first front vertical plate 211 of fixed supporting leg structure.
Be high-stress area territory near door-plate 24 and the region of overlap joint block 25, be designed to the first front vertical plate 211, it is slab; Another part region is little stress area, is designed to the second front vertical plate 212, and it is thin plate.The butt weld of two boards is curve form.
Front vertical plate assembly 21 is docked by thick, thin riser and forms; Adopt slab in high-stress area territory, adopt thin plate at little stress area, ensure that the reliability in high-stress area territory, avoid the waste of material of little stress area, given full play to the performance of every block of material, not only ensure that reliability but also achieve lightweight.
See Fig. 2 and Fig. 3, the weld seam 213 between the first front vertical plate 211 and the second front vertical plate 212 is curve-like along its length.
Butt weld between thin, slab adopts curve form, avoids whole piece weld seam to be in same stressed cross section, and then avoids welding residual stress with structural stress at same cross section undue concentration, improves the structural reliability of docking region.
See Fig. 2, Fig. 4, middle riser assembly 22 comprises the middle riser 222 of the first middle riser 221, second, the 3rd middle riser 223 and the 4th middle riser 224.Second middle riser 222 is between the first middle riser 221 and the 3rd middle riser 223, and the 4th middle riser 224 is also between the first middle riser 221 and the 3rd middle riser 223, and the 4th middle riser 224 is positioned at below the second middle riser 222.The middle riser 222 of riser 221, second middle with first and the 3rd middle riser 223 weld respectively on three limits of the 4th middle riser 224; Riser 221 middle with first and the 3rd middle riser 223 weld respectively on the both sides of the second middle riser 222.Wherein, first middle riser 221 and the 3rd middle riser 223 are near the door-plate 24 of fixed supporting leg structure, 4th middle riser 224 is less than the thickness of the first middle riser 221, the 3rd middle riser 223 and the 4th middle riser 224 near the thickness of the middle riser 222 of overlap joint block 25, second of fixed supporting leg structure.
Middle riser assembly 22 is docked by thick, thin riser and forms; Adopt slab in high-stress area territory, adopt thin plate at little stress area, ensure that the reliability in high-stress area territory, avoid the waste of material of little stress area, given full play to the performance of every block of material, not only ensure that reliability but also achieve lightweight.
See Fig. 2 and Fig. 4,4th middle riser 224 and the weld seam 225 between the first middle riser 222 of middle riser 221, second and the 3rd middle riser 223 are linearity along its length, and the second middle riser 222 and the weld seam 225 between the first middle riser 221 and the 3rd middle riser 223 are linearity along its length.
Due to middle riser assembly 22 and two pieces of door-plates 24 with overlap block 25 and be connected, thus both sides and door-plate 24 and to overlap the close region of block 25 be high-stress area territory, be designed to slab, zone line is little stress area, be designed to thin plate, simultaneously in order to discharge welding stress, reduce welding deformation, slab is divided into three pieces of sheet material docking, whole middle riser is by the first middle riser 221, second middle riser 222, 3rd middle riser 223, 4th middle riser 224 4 blocks plate docking forms, butt weld is made up of a horizon and two oblique lines, all at a certain angle with stressed cross section.
Thin, slab butt weld adopts the oblique line form angled with stressed cross section, avoids whole piece weld seam to be in same stressed cross section, and then avoids welding residual stress with structural stress at same cross section undue concentration, improves the structural reliability of docking region.
See Fig. 2 and Fig. 5, back vertical plate assembly 23 comprises the first back vertical plate 231 and the second back vertical plate 232, weld between first back vertical plate 231 and the second back vertical plate 232, the first back vertical plate 231 is greater than the thickness of the second back vertical plate 232 near the thickness of door-plate 24, first back vertical plate 231 of fixed supporting leg structure.
The region of close door-plate 24 and overlap joint block 25 is high-stress area territory, and being designed to the first back vertical plate 231 is slab, and another part region is little stress area, and being designed to the second back vertical plate 232 is thin plate, and butt weld is a camber line.
Back vertical plate assembly 23 is docked by thick, thin riser and forms; Adopt slab in high-stress area territory, adopt thin plate at little stress area, ensure that the reliability in high-stress area territory, avoid the waste of material of little stress area, given full play to the performance of every block of material, not only ensure that reliability but also achieve lightweight.
See Fig. 2 and Fig. 5, the weld seam 233 between the first back vertical plate 231 and the second back vertical plate 232 is arc shaped along its length.
Thin, slab butt weld adopts form of arcs, avoids whole piece weld seam to be in same stressed cross section, and then avoids welding residual stress with structural stress at same cross section undue concentration, improves the structural reliability of docking region.
From the above, the oblique line form that in fixed supporting leg structure, the butt weld of each riser assembly thin and thick plate is designed to curve form or forms an angle with stressed cross section: in the process of fixed supporting leg and movable supporting legs transmitting force, door-plate 24 and overlap joint block 25 are subject to power straight up and power straight down respectively, fixed supporting leg longitudinal cross-section is stressed cross section, bears moment of flexure and shearing force.Same stressed cross section is in for avoiding whole piece weld seam, the butt weld of front vertical plate, middle riser, back vertical plate is designed to curve form or is designed to the oblique line form that forms an angle with stressed cross section, thus avoid welding residual stress and structural stress undue concentration in same stressed cross section, improve reliability of structure.
See Fig. 2, fixed supporting leg structure also comprises horizontal brace panel 28 and at least two pieces of longitudinal brace panels 26.Wherein one end of each longitudinal brace panel 26 and middle riser assembly 22 are fixed, the other end of each longitudinal brace panel 26 and front vertical plate assembly 21 or back vertical plate assembly 23 fixing.The two ends of horizontal brace panel 28 respectively with one piece longitudinal brace panel 26 fix.
In the present embodiment, the quantity of longitudinal brace panel 26 is six pieces, and six pieces of longitudinal brace panels 26 be arranged in parallel.One piece of horizontal brace panel 28 is provided with between every two pieces of longitudinal brace panels 26.
Fixed supporting leg structure is arranged longitudinal brace panel 26 and horizontal brace panel 28 simultaneously, increase the bending moment of inertia of the arbitrary longitudinal cross-section of fixed supporting leg, improve the anti-bending strength of fixed supporting leg structural entity, can control the welding deformation of fixed supporting leg riser upper limb, when fixed supporting leg riser sheet material is thinner, effect can be more obvious simultaneously.
Technique scheme, for wheel crane provides a kind of novel fixed supporting leg version, can meet reliability and weight-saving requirement simultaneously.This fixed supporting leg structure is by considering the stress gradient distribution of fixed supporting leg riser, fixed supporting leg riser is designed to the riser version that thin and thick plate is butted into by foundation equal strength principle, thus reach minimizing waste of material, reduce cost of product, realize lightweight and ensure structural strength; The oblique line form that the welding seam design that thin and thick plate docks is curve form or forms an angle with stressed cross section, avoid whole piece weld seam and be arranged in the problem that welding residual stress and structural stress concentrations are caused in same stressed cross section, improve the strained condition of butt weld, improve the integrally-built reliability of fixed supporting leg; By arranging horizontal brace panel 28 at the upper box of fixed supporting leg structure, improve the strength and stiffness of upper box, and reach the object reducing welding deformation.
The utility model embodiment also provides a kind of vehicle frame, and it comprises the fixed supporting leg structure that the arbitrary technical scheme of the utility model provides.
The utility model embodiment provides again a kind of wheel crane, and it comprises the vehicle frame that the arbitrary technical scheme of the utility model provides.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only for ease of describing the utility model and simplified characterization, instead of instruction or infer the device of indication or element must have specific orientation, for specific azimuth configuration and operation, thus the restriction to the utility model protection content can not be interpreted as.
If employ the word such as " first ", " second " herein to limit parts, those skilled in the art should know: the use of " first ", " second " is only used to be convenient to describe the utility model and simplified characterization, as do not stated in addition, the implication that above-mentioned word is not special.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although be described in detail the utility model with reference to preferred embodiment; those of ordinary skill in the field are to be understood that: modify to detailed description of the invention of the present utility model or carry out equivalent replacement to portion of techniques feature; and not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope of the utility model request protection.
Claims (10)
1. a fixed supporting leg structure, is characterized in that, comprises front vertical plate assembly (21), middle riser assembly (22) and back vertical plate assembly (23); In described front vertical plate assembly (21), described middle riser assembly (22) and described back vertical plate assembly (23), one of them described board component is formed by the polylith plate welding of different-thickness; The magnitude of load that the thickness of each described flat board is carried by it is determined.
2. fixed supporting leg structure according to claim 1, it is characterized in that, described front vertical plate assembly (21) comprises the first front vertical plate (211) and the second front vertical plate (212), weld between described first front vertical plate (211) and described second front vertical plate (212), described first front vertical plate (211) is near the door-plate (24) of described fixed supporting leg structure, and the thickness of described first front vertical plate (211) is greater than the thickness of described second front vertical plate (212).
3. fixed supporting leg structure according to claim 2, is characterized in that, the weld seam between described first front vertical plate (211) and described second front vertical plate (212) is curve-like along its length.
4. fixed supporting leg structure according to claim 1, it is characterized in that, described middle riser assembly (22) comprises the first middle riser (221), the second middle riser (222), the 3rd middle riser (223) and the 4th middle riser (224);
Described second middle riser (222) is positioned between described first middle riser (221) and described 3rd middle riser (223), described 4th middle riser (224) is also positioned between described first middle riser (221) and described 3rd middle riser (223), and described 4th middle riser (224) is positioned at described second middle riser (222) below;
Three limits of described 4th middle riser (224) are welded with described first middle riser (221), described second middle riser (222) and described 3rd middle riser (223) respectively; The both sides of the second middle riser (222) are welded with described first middle riser (221) and described 3rd middle riser (223) respectively;
Wherein, the door-plate (24) of described first middle riser (221) and the close described fixed supporting leg structure of described 3rd middle riser (223), described 4th middle riser (224) is near the overlap joint block (25) of described fixed supporting leg structure, and the thickness of described second middle riser (222) is less than the thickness of described first middle riser (221), described 3rd middle riser (223) and described 4th middle riser (224).
5. fixed supporting leg structure according to claim 4, it is characterized in that, described 4th middle riser (224) and described first middle riser (221), weld seam between described second middle riser (222) and described 3rd middle riser (223) are linearity along its length, and the second middle riser (222) and the weld seam between described first middle riser (221) and described 3rd middle riser (223) are linearity along its length.
6. fixed supporting leg structure according to claim 1, it is characterized in that, described back vertical plate assembly (23) comprises the first back vertical plate (231) and the second back vertical plate (232), weld between described first back vertical plate (231) and described second back vertical plate (232), described first back vertical plate (231) is near the door-plate (24) of described fixed supporting leg structure, and the thickness of described first back vertical plate (231) is greater than the thickness of described second back vertical plate (232).
7. fixed supporting leg structure according to claim 6, is characterized in that, the weld seam between described first back vertical plate (231) and described second back vertical plate (232) is arc shaped along its length.
8. fixed supporting leg structure according to claim 1, is characterized in that, also comprises horizontal brace panel (28) and at least two pieces of longitudinal brace panels (26);
Wherein one end of each described longitudinal brace panel (26) and described middle riser assembly (22) are fixed, the other end of each described longitudinal brace panel (26) and described front vertical plate assembly (21) or described back vertical plate assembly (23) fixing; The two ends of described horizontal brace panel (28) respectively with one piece described longitudinal brace panel (26) fix.
9. a vehicle frame, is characterized in that, comprises the arbitrary described fixed supporting leg structure of claim 1-8.
10. a wheel crane, is characterized in that, comprises vehicle frame according to claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520642044.4U CN204980952U (en) | 2015-08-25 | 2015-08-25 | Fixed leg structure, frame and wheel crane |
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| CN201520642044.4U CN204980952U (en) | 2015-08-25 | 2015-08-25 | Fixed leg structure, frame and wheel crane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110950256A (en) * | 2019-12-17 | 2020-04-03 | 泰安航天特种车有限公司 | Double-crane chassis and crane applied to same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110950256A (en) * | 2019-12-17 | 2020-04-03 | 泰安航天特种车有限公司 | Double-crane chassis and crane applied to same |
| CN110950256B (en) * | 2019-12-17 | 2021-03-26 | 泰安航天特种车有限公司 | Double-crane chassis and crane applied to same |
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