CN112239151A - Telescopic leg assembly and automobile crane - Google Patents
Telescopic leg assembly and automobile crane Download PDFInfo
- Publication number
- CN112239151A CN112239151A CN201910650736.6A CN201910650736A CN112239151A CN 112239151 A CN112239151 A CN 112239151A CN 201910650736 A CN201910650736 A CN 201910650736A CN 112239151 A CN112239151 A CN 112239151A
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- Prior art keywords
- leg
- supporting leg
- movable
- box
- reinforcing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
- B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/72—Counterweights or supports for balancing lifting couples
- B66C23/78—Supports, e.g. outriggers, for mobile cranes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
Abstract
The invention relates to a telescopic leg assembly and an automobile crane. The telescopic leg assembly comprises a movable leg and a leg box, the leg box comprises an upper cover plate, a bottom plate and at least two vertical plates which are arranged in parallel at intervals, and a leg mounting hole for guiding the movable leg to stretch in the front-back direction is formed by the upper cover plate, the vertical plates and the bottom plate; the movable supporting leg has a maximum extending position in the moving stroke, which enables the supporting leg beam to extend out of the supporting leg box by the maximum distance, and the supporting leg box has a supporting leg overlapping part at the maximum position, which is overlapped with the movable supporting leg when the movable supporting leg is at the maximum extending position; the vertical plates are provided with extending parts extending downwards and protruding out of the lower side face of the bottom plate, the extending parts are located on the landing leg overlapping parts of the limiting positions of the landing leg box, reinforcing parts used for increasing the overlapping strength of the movable landing legs and the landing leg box are arranged between the extending parts of the two adjacent vertical plates, the reinforcing parts are fixed with the bottom plate and fixed with the extending parts of the two adjacent vertical plates, and the stability of the automobile crane is improved by enhancing the rigidity of the bottom plate at the overlapping position.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a telescopic leg assembly and an automobile crane.
Background
The automobile crane is widely applied in modern industrial production and is equipment with relatively high danger coefficient. In order to increase the lifting capacity and stability of the automobile crane, the automobile crane is provided with movable supporting legs. The H-shaped supporting legs have the characteristics of large supporting leg span, good adaptability to the ground during working, capability of independently operating and leveling each movable supporting leg by a hydraulic oil cylinder and the like, and are widely applied to small and medium-sized automobile cranes.
The supporting leg box matched with the supporting leg is used as a supporting mechanism of the supporting leg, supporting reaction force is provided for the supporting leg, the force is inversely proportional to the length (lap joint quantity) of the supporting leg in the supporting leg box in a fully extended state of the supporting leg, and therefore under the condition that the length of the supporting leg box is fixed, the smaller the length of the supporting leg in the supporting leg box in the fully extended state of the supporting leg is, the larger the supporting leg span is, and the higher the integral stability of the automobile crane is. However, in the fully extended state of the support leg, the length of the support leg in the support leg box is minimum, that is, the lap joint amount of the support leg is minimum, and in the actual hoisting operation, the force applied to the lap joint of the support leg and the support leg box is maximum, so that the deformation of the bottom plate of the support leg box is easily generated, and the overall stability of the automobile crane is further influenced.
Disclosure of Invention
The invention aims to provide a telescopic leg assembly to solve the technical problem that in the prior art, the stability of an automobile crane is poor due to the fact that a bottom plate of a supporting leg box is easy to deform; the invention also aims to provide the automobile crane which has long service life and stable performance of the whole automobile.
In order to achieve the purpose, the technical scheme of the telescopic leg component is as follows:
the telescoping leg assembly comprises:
a movable leg;
the supporting leg box is used for installing the movable supporting legs and comprises an upper cover plate, a bottom plate and at least two vertical plates which are arranged in parallel at intervals, and supporting leg installing holes which are used for accommodating the movable supporting legs and allowing the movable supporting legs to guide and move in the front-back direction are formed between the upper cover plate and the vertical plates as well as between the upper cover plate and the bottom plate;
the movable supporting leg comprises a supporting leg beam which is in guide movement fit with the supporting leg box and a lifting supporting leg which is provided with one end of the supporting leg beam extending out of the supporting leg box;
the movable supporting leg has a maximum extending position for extending the supporting leg beam out of the supporting leg box for the maximum distance in the moving stroke, and the supporting leg box has a supporting leg overlapping part at the maximum position which is overlapped with the movable supporting leg when the movable supporting leg is at the maximum extending position;
the vertical plates are provided with extending parts which extend downwards and protrude out of the lower side surface of the bottom plate, the extending parts are positioned on the landing leg overlapping parts at the extreme positions of the landing leg box, reinforcing parts used for increasing the overlapping strength of the movable landing legs and the landing leg box are arranged between the extending parts of two adjacent vertical plates, and the reinforcing parts are fixed with the bottom plate and the extending parts of the two adjacent vertical plates.
Has the advantages that: because the extending parts of the vertical plates are positioned on the landing leg overlapping part at the limit position of the landing leg box, and a reinforcing piece is arranged between every two adjacent vertical plates, the rigidity of the bottom plate at the overlapping part of the movable landing leg and the landing leg box is increased through the reinforcing piece; and because the reinforcing piece is fixedly connected with the extending parts on the two adjacent vertical plates, namely, the force which is generated by the movable supporting leg and acts downwards on the bottom plate of the supporting leg box can be dispersed on the vertical plates of the supporting leg box through the reinforcing piece, so that the deformation of the bottom plate of the supporting leg box is reduced, and the stability of the automobile crane is ensured during actual use.
Further, the extreme position leg overlapping portion includes a leg beam rear end support portion for supporting a rear end of the leg beam when the movable leg is in the extended extreme position, and the reinforcement member is fixed to the leg beam rear end support portion.
Has the advantages that: the reinforcing piece is fixed on the supporting part at the rear end of the supporting leg beam, and the reinforcing piece is not arranged at other positions, so that the local strength of the lap joint of the movable supporting leg and the supporting leg box is increased while the whole weight of the telescopic leg assembly is not increased.
Further, the rear end support portion of the leg beam includes a rear end spacer fixed to the base plate to be in supporting engagement with the rear end of the leg beam when the movable leg is at the projecting limit position.
Has the advantages that: the supporting cushion block can reduce the resistance of the movable supporting leg in the moving process, and meanwhile, when the movable supporting leg works, the downward force acting on the bottom plate of the supporting leg box is concentrated on the cushion block and is dispersed to the vertical plate of the supporting leg box through the cushion block via the reinforcing piece, so that the damage to the bottom plate of the supporting leg box is further reduced.
Furthermore, the telescopic leg assembly further comprises a leveling cushion block which is arranged in the leg box and matched with the rear end supporting cushion block to ensure that the movable leg horizontally moves, and the leveling cushion block and the rear end supporting cushion block are arranged at intervals in the front and back.
Has the advantages that: the leveling cushion block can ensure that the movable supporting leg is in a horizontal state in the moving process, and the support stability of the movable supporting leg is prevented from being influenced by the tilting of the movable supporting leg.
Further, the supporting leg beam is in clearance fit with the upper cover plate of the supporting leg box.
Has the advantages that: the supporting leg beam is in clearance fit with the upper cover plate of the supporting leg box, and a cushion block is not required to be arranged between the supporting leg beam and the upper cover plate of the supporting leg box, so that the movable supporting leg is convenient to assemble.
Furthermore, the reinforcing part comprises a plurality of reinforcing vertical plates which are arranged at intervals in the front-back direction, the number of the reinforcing vertical plates is odd, and the rear end supporting cushion block is positioned above the reinforcing vertical plates in the middle position.
Has the advantages that: the rear end supporting cushion block is positioned above the reinforcing vertical plate at the middle position, so that the downward acting force borne by the rear end supporting cushion block can be more uniformly dispersed to the reinforcing vertical plates at the two sides through the reinforcing vertical plate at the middle position; the force can also be dispersed by the strengthening vertical plate with the projection in the up-down direction and the coincidence with the back end supporting cushion block.
Further, the reinforcing part comprises a plurality of reinforcing vertical plates which are arranged at intervals in the front-back direction.
Has the advantages that: the reinforcement includes a plurality of risers of strengthening, further improves the intensity of activity landing leg and landing leg case overlap joint department.
Furthermore, the reinforcing part also comprises a reinforcing flat plate fixed with the bottom plate, and the reinforcing vertical plates are fixed on the reinforcing flat plate.
Has the advantages that: the reinforcing flat plate can increase the rigidity of the bottom plate and reduce the stress deformation of the bottom plate when the movable supporting leg works; strengthen the riser and all fix on strengthening the flat board, form the effect of dual enhancement, guarantee the stability that telescopic component used.
Furthermore, the telescopic leg assembly further comprises a vertical plate reinforcing plate which is fixedly welded with the vertical plate and used for reinforcing the strength of the vertical plate, the vertical plate reinforcing plate comprises a lower extension part protruding out of the lower side surface of the bottom plate, and the lower extension part is overlapped on the extension part of the vertical plate.
Has the advantages that: the strength of the vertical plate can be increased, so that the strength of the leg box is increased, and the service life of the leg box is prolonged.
The technical scheme of the automobile crane is as follows:
mobile crane includes automobile body and the flexible leg subassembly of fixed connection on the automobile body, and wherein, flexible leg subassembly includes:
a movable leg;
the supporting leg box is used for installing the movable supporting legs and comprises an upper cover plate, a bottom plate and at least two vertical plates which are arranged in parallel at intervals, and supporting leg installing holes which are used for accommodating the movable supporting legs and allowing the movable supporting legs to guide and move in the front-back direction are formed between the upper cover plate and the vertical plates as well as between the upper cover plate and the bottom plate;
the movable supporting leg comprises a supporting leg beam which is in guide movement fit with the supporting leg box and a lifting supporting leg which is provided with one end of the supporting leg beam extending out of the supporting leg box;
the movable supporting leg has a maximum extending position for extending the supporting leg beam out of the supporting leg box for the maximum distance in the moving stroke, and the supporting leg box has a supporting leg overlapping part at the maximum position which is overlapped with the movable supporting leg when the movable supporting leg is at the maximum extending position;
the vertical plates are provided with extending parts which extend downwards and protrude out of the lower side surface of the bottom plate, the extending parts are positioned on the landing leg overlapping parts at the extreme positions of the landing leg box, reinforcing parts used for increasing the overlapping strength of the movable landing legs and the landing leg box are arranged between the extending parts of two adjacent vertical plates, and the reinforcing parts are fixed with the bottom plate and the extending parts of the two adjacent vertical plates.
Has the advantages that: because the extending parts of the vertical plates are positioned on the landing leg overlapping part at the limit position of the landing leg box, and a reinforcing piece is arranged between every two adjacent vertical plates, the rigidity of the bottom plate at the overlapping part of the movable landing leg and the landing leg box is increased through the reinforcing piece; and because the reinforcing piece is fixedly connected with the extending parts on the two adjacent vertical plates, namely, the force which is generated by the movable supporting leg and acts downwards on the bottom plate of the supporting leg box can be dispersed on the vertical plates of the supporting leg box through the reinforcing piece, so that the deformation of the bottom plate of the supporting leg box is reduced, the stability of the automobile crane is ensured during actual use, and the service life of the automobile crane is prolonged.
Further, the extreme position leg overlapping portion includes a leg beam rear end support portion for supporting a rear end of the leg beam when the movable leg is in the extended extreme position, and the reinforcement member is fixed to the leg beam rear end support portion.
Has the advantages that: the reinforcing piece is fixed on the supporting part at the rear end of the supporting leg beam, and the reinforcing piece is not arranged at other positions, so that the local strength of the lap joint of the movable supporting leg and the supporting leg box is increased while the whole weight of the telescopic leg assembly is not increased.
Further, the rear end support portion of the leg beam includes a rear end spacer fixed to the base plate to be in supporting engagement with the rear end of the leg beam when the movable leg is at the projecting limit position.
Has the advantages that: the supporting cushion block can reduce the resistance of the movable supporting leg in the moving process, and meanwhile, when the movable supporting leg works, the downward force acting on the bottom plate of the supporting leg box is concentrated on the cushion block and is dispersed to the vertical plate of the supporting leg box through the cushion block via the reinforcing piece, so that the damage to the bottom plate of the supporting leg box is further reduced.
Furthermore, the telescopic leg assembly further comprises a leveling cushion block which is arranged in the leg box and matched with the rear end supporting cushion block to ensure that the movable leg horizontally moves, and the leveling cushion block and the rear end supporting cushion block are arranged at intervals in the front and back.
Has the advantages that: the leveling cushion block can ensure that the movable supporting leg is in a horizontal state in the moving process, and the support stability of the movable supporting leg is prevented from being influenced by the tilting of the movable supporting leg.
Further, the supporting leg beam is in clearance fit with the upper cover plate of the supporting leg box.
Has the advantages that: the supporting leg beam is in clearance fit with the upper cover plate of the supporting leg box, and a cushion block is not required to be arranged between the supporting leg beam and the upper cover plate of the supporting leg box, so that the movable supporting leg is convenient to assemble.
Furthermore, the reinforcing part comprises a plurality of reinforcing vertical plates which are arranged at intervals in the front-back direction, the number of the reinforcing vertical plates is odd, and the rear end supporting cushion block is positioned above the reinforcing vertical plates in the middle position.
Has the advantages that: the rear end supporting cushion block is positioned above the reinforcing vertical plate at the middle position, so that the downward acting force borne by the rear end supporting cushion block can be more uniformly dispersed to the reinforcing vertical plates at the two sides through the reinforcing vertical plate at the middle position; the force can also be dispersed by the strengthening vertical plate with the projection in the up-down direction and the coincidence with the back end supporting cushion block.
Further, the reinforcing part comprises a plurality of reinforcing vertical plates which are arranged at intervals in the front-back direction.
Has the advantages that: the reinforcement includes a plurality of risers of strengthening, further improves the intensity of activity landing leg and landing leg case overlap joint department.
Furthermore, the reinforcing part also comprises a reinforcing flat plate fixed with the bottom plate, and the reinforcing vertical plates are fixed on the reinforcing flat plate.
Has the advantages that: the reinforcing flat plate can increase the rigidity of the bottom plate and reduce the stress deformation of the bottom plate when the movable supporting leg works; strengthen the riser and all fix on strengthening the flat board, form the effect of dual enhancement, guarantee the stability that telescopic component used.
Furthermore, the telescopic leg assembly further comprises a vertical plate reinforcing plate which is fixedly welded with the vertical plate and used for reinforcing the strength of the vertical plate, the vertical plate reinforcing plate comprises a lower extension part protruding out of the lower side surface of the bottom plate, and the lower extension part is overlapped on the extension part of the vertical plate.
Has the advantages that: the strength of the vertical plate can be increased, so that the strength of the leg box is increased, and the service life of the leg box is prolonged.
Drawings
FIG. 1 is an isometric view of a telescoping leg assembly of the present invention;
FIG. 2 is a partial schematic view of the telescoping leg assembly of the present invention;
FIG. 3 is a schematic structural view of a leveling pad in the telescoping leg assembly of the present invention;
FIG. 4 is a schematic view of the configuration of the lap joint between the movable leg and the leg box of the telescoping leg assembly of the present invention;
FIG. 5 is a front view of a leg box in the telescoping leg assembly of the present invention;
fig. 6 is a schematic view of the connection of the telescoping leg assembly of the present invention to a truck crane undercarriage body.
Description of reference numerals: 1-upper cover plate, 2-side vertical plate, 3-vertical plate reinforcing plate, 4-movable supporting leg, 5-vertical oil cylinder, 6-supporting leg component, 7-bottom plate, 8-leveling cushion block, 9-fixing block, 10-central vertical plate, 11-rear end supporting cushion block, 12-reinforcing flat plate, 13-reinforcing vertical plate, 14-extending part, 15-lower extending part, 16-supporting leg box, 17-supporting leg mounting hole, 18-threaded hole, 19-supporting leg beam, 20-oil cylinder cover, 21-bottom frame main body and 22-horizontal oil cylinder fixing support.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
Specific embodiments of the telescoping leg assembly of the present invention:
as shown in fig. 1, 2, 3, 4 and 5, the telescopic leg assembly includes a leg box 16 and a movable leg 4 movably installed in the leg box 16, wherein the movable leg 4 overlaps the leg box 16 during the moving process and has a certain overlapping amount, and the overlapping amount refers to the length of the movable leg 3 located in the leg box 16 during the moving process.
Landing leg case 16 is H shape landing leg case, including upper cover plate 1, bottom plate 7 and simultaneously with upper cover plate 1 and bottom plate 7 welded fastening's riser, the riser is including the central riser 10 that is located the side riser 2 of landing leg case 16 both sides and position landing leg case intermediate position, and central riser 10 is located the intermediate position of upper cover plate 1 and bottom plate 7 to correspond respectively and upper cover plate 1 and bottom plate 7 welded fastening. The upper cover plate 1, the bottom plate 7, the side vertical plates 2 and the central vertical plate 10 are all made of HG60 high-strength steel plates, and the four parts are enclosed to form a leg mounting hole 17 for mounting the movable leg 4 and guiding the movable leg 4 to move. The leg box 16 in this embodiment has two leg mounting holes 17, a movable leg is mounted in each leg mounting hole 17, a horizontal cylinder fixing bracket 22 is further disposed in each leg mounting hole 17, and a horizontal cylinder (not shown in the figure) for driving the movable leg 4 to move relative to the leg box 16 is fixedly mounted on the horizontal cylinder fixing bracket 22. According to the movable leg, one end is the front end, and the other end is the rear end, the moving direction of the movable leg 4 is defined as the front-rear direction, and when the two movable legs work, one moves forwards, and the other moves backwards. The movable supporting leg 4 comprises a supporting leg beam 19 which can move along the front and back direction of the supporting leg mounting hole 17 and is matched with the supporting leg beam, and a lifting supporting leg arranged at one end of the supporting leg beam 19, which extends out of the supporting leg mounting hole 17, wherein a vertical oil cylinder 5 capable of controlling the lifting supporting leg to lift up and down is arranged on the lifting supporting leg. The movable leg 4 has an extended limit position in a moving stroke in which the leg beam 19 is extended by a maximum distance from the leg box 16, and the leg box 16 has a limit position leg overlapping portion overlapping the movable leg 4 when the movable leg 4 is at its extended limit position, the limit position leg overlapping portion including a leg beam rear end support portion for supporting a rear end of the leg beam 19 when the movable leg 4 is at the extended limit position.
The side vertical plates 2 and the central vertical plate 10 are similar in structure and are provided with extension parts 14 extending downwards and protruding out of the bottom plate 7, and the extension parts 14 are positioned on the leg overlapping parts of the leg box in the extreme position. A reinforcement is welded and fixed between the side vertical plate 2 and the extension portion 14 of the center vertical plate 10, and the reinforcement is fixed to the above-described leg beam rear end support portion at the same time. The reinforcing piece and the extending parts 14 of the side vertical plates and the central vertical plate form a space reinforcing structure for increasing the structural strength of the lap joint of the movable leg 4 and the leg box 16, in the embodiment, the reinforcing piece comprises a reinforcing flat plate 12 welded on the lower side surface of the bottom plate, and two sides of the reinforcing flat plate 12 are simultaneously welded and fixed with the extending parts 14 of the side vertical plates 2 and the central vertical plate 10 to increase the strength of the bottom plate 7; the reinforcing part further comprises reinforcing vertical plates 13 which are welded and fixed on the reinforcing flat plate 12 and are arranged at intervals in the front-back direction, the number of the reinforcing vertical plates 13 is odd, in the embodiment, the number of the reinforcing vertical plates 13 is three, and two sides of each reinforcing vertical plate 13 are welded and fixed with the extending parts 14 of the side vertical plates 2 and the central vertical plate 10.
In this embodiment, the rear end support portion of the leg beam includes a base plate 7 and a rear end spacer block 11 fixed to the base plate 7 to be in supporting engagement with the rear end of the leg beam 19 when the movable leg 4 is at the projecting limit position, and the rear end spacer block 11 can reduce the resistance of the movable leg 4 during movement. The rear end supporting cushion block 11 is simultaneously positioned between the reinforcing flat plate 12 and the rear end of the movable leg, the rear end supporting cushion block 11 is positioned above the reinforcing vertical plate 13 at the middle position, and the center of the reinforcing vertical plate 13 at the middle position is positioned on the part extending downwards on the rear side surface of the rear end supporting cushion block 11. Thus, the downward force of the movable supporting leg 4 on the supporting leg box is firstly applied to the rear end supporting cushion block 11, and the vertical plate 13 is reinforced through the center through the rear end supporting cushion block 11 to be uniformly dispersed to the side vertical plate and the center vertical plate of the supporting leg box, so that the stress deformation of the bottom plate 7 is reduced, and the service life of the supporting leg box is prolonged.
The telescopic leg assembly further comprises a vertical plate reinforcing plate 3 which is fixedly welded with the side vertical plate 2 and used for reinforcing the strength of the vertical plate, the vertical plate reinforcing plate 3 comprises a lower extension part 15 protruding out of the lower side surface of the bottom plate, and the lower extension part 15 is overlapped on the extension part 14.
A fixing block 9 is arranged on the bottom plate 7 close to the orifice of the landing leg mounting hole 17, the fixing block 9 and the cushion block 11 are arranged at intervals, a threaded hole 18 is formed in the fixing block 9, and the fixing block 9 is fixed on the bottom plate 7 through fasteners such as bolts. The telescopic leg assembly further comprises a leveling cushion block 8 fixed on the fixed block 9, the cross section of the leveling cushion block 8 in the front-back direction is in a convex shape, the thickness of the leveling cushion block is the same as that of the cushion block 11, and the leveling cushion block is used for ensuring the stretching state of the movable leg when the movable leg moves. In this embodiment, the leveling cushion block is a nylon slider. The supporting leg beam of the movable supporting leg is in clearance fit with the upper cover plate of the supporting leg box, no cushion block is arranged, but during actual hoisting operation, the supporting leg beam 19 of the movable supporting leg can also generate an upward acting force on the upper cover plate 1 of the supporting leg box. In order to prevent the deformation of the upper cover plate of the leg box caused by the acting force, a cylinder cover 20 is welded and fixed on the upper cover plate 1 of the leg box at a position close to the hole edge of the leg mounting hole 17. As shown in fig. 6, when the cylinder cover 20 is installed, it is welded and fixed to the leg box, and then welded and fixed to the underframe main body 21 of the truck crane, so that the stress on the upper cover plate 1 of the leg box is dispersed to the underframe main body 21 through the cylinder cover 20, thereby increasing the strength of the upper cover plate 1 at the lap joint of the movable leg 4 and the leg box 16, and reducing the deformation of the upper cover plate 1.
When the automobile crane works, the whole automobile is lifted off the ground, all the weight is borne by the movable supporting legs 4, the movable supporting legs 4 are limited by the supporting leg box 16, a downward force acting on the bottom plate 7 can be formed at the cushion blocks 11, and the downward force borne by the bottom plate 7 is dispersed to the side vertical plates 2 and the central vertical plate 10 of the supporting leg box through the reinforcing flat plates 12 and the reinforcing vertical plates 13, so that the damage to the bottom plate 7 of the supporting leg box body is reduced. Under the condition that the width of the automobile crane is certain, under the action of the reinforcing vertical plate 13 and the reinforcing flat plate 12, the local rigidity of the lap joint of the movable supporting leg and the supporting leg box is increased, the movable supporting leg can be ensured to extend out as far as possible during working, the span of the movable supporting leg is enabled to reach the maximum, therefore, the telescopic leg assembly works more stably, the stability of the whole automobile is enhanced, and the rollover accident is reduced.
In the above embodiments, the reinforcing member is fixed to the rear end support portion of the leg beam, and in other embodiments, the reinforcing member may be provided at other positions, for example, below a position away from the projecting limit position of the movable leg.
In other embodiments, if the strength of the bottom plate is sufficient, only the reinforcing vertical plate can be arranged, but the reinforcing plate is welded and fixed with the extending parts on the bottom plate, the side vertical plates and the central vertical plate; or in other embodiments, only the reinforcing flat plate can be arranged, and the reinforcing flat plate is welded and fixed with the extending parts on the bottom plate, the side vertical plates and the central vertical plate at the same time.
In the above embodiment, the number of the reinforcing vertical plates is odd, and the base plate is disposed above the reinforcing vertical plate at the middle position.
In the above embodiments, the rear end support cushion blocks in the leg mounting holes reduce the resistance of the movable legs during the movement process, and in other embodiments, the rear end support cushion blocks may not be provided under the condition that the design requirements of the support strength are met, and the rear end support portions of the leg beams only include the bottom plate.
In the above embodiments, the leg beam of the movable leg is in clearance fit with the upper cover plate of the leg box, and in other embodiments, an upper cushion block may be disposed in a clearance between the leg beam of the movable leg and the upper cover plate of the leg box.
In the above embodiments, the leveling cushion blocks and the cushion blocks are arranged at intervals, and the thicknesses of the leveling cushion blocks and the cushion blocks are equal to ensure the horizontal movement of the movable support legs.
In the above embodiment, the side vertical plate is welded and fixed with the vertical plate reinforcing plate, and in other embodiments, if the strength of the side vertical plate is sufficient, the vertical plate reinforcing plate may not be provided.
The concrete embodiment of the truck crane of the invention is as follows: the automobile crane comprises a crane body and a telescopic leg assembly fixedly connected to the crane body, and the structure of the telescopic leg assembly is the same as that of the telescopic leg assembly in the embodiment, so that the details are not repeated.
Claims (10)
1. A telescoping leg assembly, comprising:
a movable leg;
the supporting leg box is used for installing the movable supporting legs and comprises an upper cover plate, a bottom plate and at least two vertical plates which are arranged in parallel at intervals, and supporting leg installing holes which are used for accommodating the movable supporting legs and allowing the movable supporting legs to guide and move in the front-back direction are formed between the upper cover plate and the vertical plates as well as between the upper cover plate and the bottom plate;
the movable supporting leg comprises a supporting leg beam which is in guide movement fit with the supporting leg box and a lifting supporting leg which is arranged at one end of the supporting leg beam extending out of the supporting leg box;
the movable supporting leg has a maximum extending position for extending the supporting leg beam out of the supporting leg box for the maximum distance in the moving stroke, and the supporting leg box has a supporting leg overlapping part at the maximum position which is overlapped with the movable supporting leg when the movable supporting leg is at the maximum extending position;
the vertical plates are provided with extending parts which extend downwards and protrude out of the lower side surface of the bottom plate, the extending parts are positioned on the landing leg overlapping parts at the extreme positions of the landing leg box, reinforcing parts used for increasing the overlapping strength of the movable landing legs and the landing leg box are arranged between the extending parts of two adjacent vertical plates, and the reinforcing parts are fixed with the bottom plate and the extending parts of the two adjacent vertical plates.
2. The telescoping leg assembly of claim 1, wherein: the extreme position leg overlapping portion includes a leg beam rear end support portion for supporting a rear end of the leg beam when the movable leg is in the extended extreme position, and the reinforcement member is fixed to the leg beam rear end support portion.
3. A telescoping leg assembly as in claim 2 wherein the rear leg beam support portion includes a rear end bolster block secured to the base plate for engaging the rear leg beam support when the movable leg is in the extended limit position.
4. The extendable leg assembly of claim 3, further comprising a leveling pad disposed within the leg well and cooperating with the rear end bolster to ensure horizontal movement of the movable leg, the leveling pad being spaced forward and rearward of the rear end bolster.
5. The telescoping leg assembly of claim 4, wherein the leg beam is a clearance fit with a leg box top cover.
6. A telescopic leg assembly according to claim 3, 4 or 5, wherein the reinforcing member comprises a plurality of reinforcing risers spaced apart from one another, the number of reinforcing risers being odd, the rear end bolster block being above the reinforcing riser in the intermediate position.
7. A telescopic leg assembly according to any of claims 1-5, wherein said reinforcement comprises a plurality of reinforcement risers spaced apart in a front-to-back direction.
8. The telescoping leg assembly of claim 7 wherein the reinforcement further comprises a reinforcement plate secured to the base plate, the reinforcement risers each being secured to the reinforcement plate.
9. The extendable leg assembly of any one of claims 1-5, further comprising a riser reinforcement plate welded to the riser for reinforcing the strength of the riser, the riser reinforcement plate comprising a lower portion protruding from the underside of the base plate, the lower portion overlapping the extension of the riser.
10. Automobile crane, comprising a car body and a telescopic leg assembly fixedly connected to the car body, characterized in that the telescopic leg assembly is as claimed in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910650736.6A CN112239151A (en) | 2019-07-18 | 2019-07-18 | Telescopic leg assembly and automobile crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910650736.6A CN112239151A (en) | 2019-07-18 | 2019-07-18 | Telescopic leg assembly and automobile crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112239151A true CN112239151A (en) | 2021-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910650736.6A Pending CN112239151A (en) | 2019-07-18 | 2019-07-18 | Telescopic leg assembly and automobile crane |
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| CN (1) | CN112239151A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113501449A (en) * | 2021-07-30 | 2021-10-15 | 湖南三一中型起重机械有限公司 | Work machine and work machine leg assembly |
| CN117208791A (en) * | 2023-09-25 | 2023-12-12 | 河南骏通车辆有限公司 | Double-support leg structure and automobile crane |
| WO2024008150A1 (en) * | 2022-07-07 | 2024-01-11 | 三一汽车制造有限公司 | Support leg telescopic apparatus, work machine, and use method |
-
2019
- 2019-07-18 CN CN201910650736.6A patent/CN112239151A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113501449A (en) * | 2021-07-30 | 2021-10-15 | 湖南三一中型起重机械有限公司 | Work machine and work machine leg assembly |
| CN113501449B (en) * | 2021-07-30 | 2023-05-09 | 湖南三一中型起重机械有限公司 | Work machine and work machine leg assembly |
| WO2024008150A1 (en) * | 2022-07-07 | 2024-01-11 | 三一汽车制造有限公司 | Support leg telescopic apparatus, work machine, and use method |
| CN117208791A (en) * | 2023-09-25 | 2023-12-12 | 河南骏通车辆有限公司 | Double-support leg structure and automobile crane |
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