CN218520961U - Working vehicle and lifting telescopic boom thereof - Google Patents

Abstract

The utility model relates to an operation vehicle and jack-up telescopic boom thereof, jack-up telescopic boom includes: sequentially sliding and sleeving at least two arm sections together, wherein the at least two arm sections comprise a head end arm section and a tail end arm section; strengthen the stay cord, its one end is the first end of connecting on the head end arm festival, and the other end is the second end of being connected with the taut pendulum rod that is equipped with on the head end arm festival, installs middle switching-over pulley on the arm festival to for strengthen the stay cord switching-over and walk around and then connect all arm festivals through strengthening the stay cord, with the intensity of reinforcing the flexible cantilever crane of jack-up when strengthening the stay cord tensioning, still including taut drive structure, it is connected with taut pendulum rod transmission, strengthen the stay cord with the swing of the taut pendulum rod of drive and then the tensioning. When the lifting telescopic boom moves in a telescopic mode, the reinforcing pull rope slides along with the telescopic action of each boom section and is always in a tensioning state, and therefore the strength of the whole lifting telescopic boom can be improved.

Description

Working vehicle and lifting telescopic boom thereof

Technical Field

The utility model relates to a work vehicle technical field generally. More specifically, the utility model relates to an operation vehicle and jack-up telescopic boom thereof.

Background

In many working vehicles such as mobile cranes and aerial working trucks, a turntable is arranged on a general chassis, a telescopic boom frame is arranged on the turntable and driven by a luffing cylinder to swing in a pitching manner, and a telescopic driving structure is arranged on the telescopic boom frame. When the telescopic boom lifting device works, the telescopic driving structure is used for driving the telescopic boom to perform telescopic action and is matched with the amplitude variation oil cylinder for use, so that the free end of the telescopic boom can telescopically move to a target position, and further, the suspension steel wire rope on the telescopic boom is guided to move to a set target, and the lifting operation is convenient.

For the working vehicle, different operations can be performed according to different functional devices configured on the telescopic boom frame so as to achieve different purposes. For example, the end part of the telescopic arm frame is provided with a manned operation fence, so that manual high-altitude operation can be realized; the telescopic boom is provided with a lifting hook and a steel wire rope, so that transported articles can be lifted and transported to realize lifting operation; the telescopic boom frame is provided with other functional devices such as a spray head and the like, so that the functions of fire fighting operation and the like can be correspondingly realized.

As for the telescopic boom frame of the working vehicle, a structure which is commonly used at present may be referred to as a telescopic boom frame on a mobile crane, which generally includes a plurality of boom sections slidably sleeved together, the plurality of boom sections on the telescopic boom frame are driven to extend and retract by a telescopic driving structure, the telescopic driving structure may specifically adopt a telescopic cylinder of an automobile crane in the invention patent application with the application publication number of CN103832934A, a telescopic boom rope structure of an automobile crane disclosed in the invention patent with the authorization publication number of CN103466473B, or a structure which adopts a telescopic cylinder to cooperate with a telescopic boom rope and is disclosed in the utility model patent with the authorization publication number of CN 202148151U.

The telescopic boom is a core component of a mobile crane, an overhead working truck and other operation vehicles, is an important bearing structural member of the mobile crane and other operation vehicles, and the weight and the rigidity of the telescopic boom directly determine the operation tonnage.

The boom section structure of the telescopic boom of the conventional mobile crane can be a sleeve type structure on an automobile crane in the invention patent application with the application publication number of CN103832934A, and such a sleeve type structure generally adopts a polygonal structure, and can also be a truss type boom section on a telescopic boom crane disclosed in the utility model patent with the application publication number of CN 202864749U. No matter what arm joint structure is specifically adopted, the strength of the telescopic arm support is completely determined by the material, the size and the structure of the arm joint, if the length and the bearing capacity of the telescopic arm support are to be increased, the arm joint of the telescopic arm support can only be redesigned, the designing and processing cost is relatively high, and the time is relatively long.

SUMMERY OF THE UTILITY MODEL

The utility model provides a jack-up telescopic boom frame of operation vehicle to solve among the prior art can only redesign the technical problem of the arm festival of the telescopic boom frame of processing when needs increase telescopic boom frame bearing capacity. And simultaneously, the utility model also provides an use the operation vehicle of above-mentioned jack-up telescopic boom frame.

In order to solve the above problems, the utility model discloses the flexible cantilever crane of jack-up of work vehicle that the first aspect provided adopts following technical scheme: a boom extension of a work vehicle, comprising: the crane comprises at least two arm sections which are sequentially sleeved together in a sliding manner, wherein the at least two arm sections comprise a head-end arm section which is used for being installed on a chassis of an operation vehicle and a tail-end arm section which is positioned at one end of the crane telescopic arm frame far away from the chassis; the telescopic driving structure is used for driving other arm sections except the head end arm section to slide so as to drive the lifting telescopic arm frame to stretch; the first end of the reinforcing pull rope is connected to the head-end arm section, the second end of the reinforcing pull rope is connected with the tensioning rod arranged on the head-end arm section, and the other arm sections except the head-end arm section are provided with middle reversing pulleys for the reinforcing pull rope to be reversed and wound so as to connect all the arm sections through the reinforcing pull rope, so that the strength of the lifting telescopic arm frame is enhanced when the reinforcing pull rope is tensioned, and the middle reversing pulley comprises a tail pulley which is arranged at the upper end of the tail-end arm section and used for guiding the reinforcing pull rope to the tensioning rod; the tensioning rod adopts the following scheme: the tensioning rod is a fixed rod, and the fixed rod and the lifting telescopic arm frame are arranged at a set angle; or the tensioning rod is a tensioning swing rod, the tensioning swing rod is hinged to the head end arm joint, the tensioning swing rod is in transmission connection with a tensioning driving structure, the tensioning driving structure drives the tensioning swing rod to swing so as to tension the reinforcing pull rope, and therefore the reinforcing pull rope can synchronously move along with all the intermediate reversing pulleys when the lifting telescopic arm frame stretches.

As a further improvement, the crane telescopic boom is composed of the head end arm section and the tail end arm section, the middle reversing pulley further comprises a lower reversing pulley arranged at the lower end of the tail end arm section, and the reinforcing pull rope sequentially winds around the lower reversing pulley and the tail end pulley along the extending direction from the first end to the second end.

As a further improvement, all the arm sections of the crane telescopic boom comprise the head end arm section, the tail end arm section and at least one middle arm section, the middle reversing pulley further comprises a lower end reversing pulley arranged at the lower end of the middle arm section and a lower end reversing pulley arranged at the lower end of the tail end arm section respectively, and an upper end reversing pulley arranged at the upper end of the middle arm section, and the reinforcing pull rope sequentially passes through the lower end reversing pulley of the middle arm section, the upper end reversing pulley of the middle arm section, the lower end reversing pulley of the tail end arm section and the tail end pulley in the direction from the first end to the second end.

As a further improvement, the first end of the reinforcing cord is connected to the upper end of the head-end arm section.

As a further improvement, the second end of the reinforcing pull rope is connected with the tail end of the tensioning swing rod, and the tensioning swing rod is driven to swing by a swing oil cylinder.

As a further improvement, a sliding piece is arranged on the tensioning swing rod and connected with the second end of the reinforcing pull rope, and the sliding piece is driven by a sliding driving structure to move so that the sliding piece carries the second end of the reinforcing pull rope to slide back and forth along the tensioning swing rod.

As a further improvement, any two arm sections of all the arm sections of the telescopic boom crane are slidably sleeved together to form an arm section group, one arm section of any arm section group is an outer arm section, the other arm section is an inner arm section, the outer arm sections of all the arm section groups of the telescopic boom crane are hinged with a support rod, the end part of the support rod is provided with a sliding piece, and the sliding piece is slidably assembled on the reinforcing pull rope.

As a further improvement, the sliding piece is a sliding sleeve, and the sliding sleeve is hinged with the supporting rod.

As a further improvement, the sliding member is slidably adjustable in the axial direction of the support rod relative to a hinge point at which the support rod is hinged to the corresponding outer arm section.

As a further improvement, the support rod is provided with a hinged part and a telescopic part which are assembled together in a slidable manner along the axial direction of the support rod, and a locking structure which locks and fixes the hinged part and the telescopic part when the telescopic boom stops telescoping and unlocks when the telescopic boom telescopes, wherein the hinged part is used for being hinged with the corresponding outer boom section, and the sliding part is arranged on the telescopic part.

As a further improvement, the locking structure is a hydraulic locking structure.

As a further improvement, at least two reinforcing pull ropes are arranged, and the supporting rods are respectively arranged on the outer arm sections of the lifting telescopic arm frame corresponding to the reinforcing pull ropes.

As a further improvement, the reinforcing pull ropes are symmetrically distributed on two opposite sides of the lifting telescopic arm frame, and the tensioning rods are respectively arranged corresponding to the reinforcing pull ropes.

The utility model discloses the operating vehicle who uses above-mentioned jack-up telescopic boom that the second aspect provided adopts following technical scheme: a work vehicle comprising: the chassis is provided with the lifting telescopic arm support in any one of the technical schemes.

As a further improvement, the working vehicle is an overhead working truck or a mobile hoisting crane.

The beneficial effects are that: the utility model provides an among the working vehicle, at the flexible in-process of flexible drive structure independent drive jack-up telescopic boom, adopt the flexible boom of enhancement stay cord reinforcing jack-up of tensioning. Strengthen the one end of stay cord and connect on the head end arm festival, on the taut pendulum rod that is equipped with on the head end arm festival is connected to one end in addition to, set up middle switching-over pulley respectively on other arm festivals except head end arm festival, in order to supply to strengthen the stay cord switching-over and bypass, utilize to strengthen the stay cord and link together each arm festival. When the lifting telescopic boom moves in a telescopic mode, the tensioning swing rod swings, the reinforcing pull rope synchronously moves along with the middle reversing pulley of the lifting telescopic boom and is always in a tensioning state, and therefore the strength of the whole lifting telescopic boom can be improved. Therefore, for the lifting telescopic boom, under the condition that the material and the shape of the boom section are not changed, the strength of the whole lifting telescopic boom can be improved by additionally arranging the reinforcing pull rope, the lifting telescopic boom does not need to be redesigned and processed, and the design and processing cost can be reduced.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings. In the accompanying drawings, which are meant to be exemplary and not limiting, several embodiments of the invention are shown and indicated by the same or corresponding reference numerals, wherein:

fig. 1 is a schematic structural diagram of an embodiment of a mobile crane provided in the present invention;

fig. 2 is a schematic structural view of the telescopic boom of fig. 1;

FIG. 3 is a schematic view of the connection of the reinforcing pull cord to the arm segment of FIG. 1;

fig. 4 is a schematic structural view of a telescopic boom of another embodiment of the mobile crane provided in the present invention;

fig. 5 is a schematic structural diagram of a telescopic boom of another embodiment of the mobile crane provided in the present invention;

fig. 6 is a schematic view of an extended position of the boom of fig. 5.

Description of reference numerals:

in fig. 1 to 4: 1. a lifting telescopic arm support; 2. a chassis; 11. a head end arm section; 12. a middle arm section; 13. a terminal arm section; 14. a telescopic driving structure; 15. a lower reversing pulley; 16. an upper end reversing pulley; 17. a reinforcing pull rope; 18. a support bar; 19. a sliding member; 20. tensioning the swing rod; 21. A terminal pulley; 28. and a swing oil cylinder.

In fig. 5 and 6: 29. fixing the rod; 11. a head end arm section; 17. a reinforcing pull rope; 18. a support rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it should be understood by those skilled in the art that the embodiments described below are part of the embodiments of the present disclosure, and not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts all belong to the protection scope of the present invention.

The utility model provides a mode of adjusting jack-up flexible cantilever crane intensity is only come through the mode that changes jack-up flexible cantilever crane radial dimension, arm festival material and arm festival cross sectional shape among the prior art, the utility model provides an adopt to strengthen the mode that the stay cord strengthened the flexible cantilever crane of jack-up, the one end of strengthening the stay cord is connected on the head end arm festival, and one end is connected on the taut pendulum rod that is preset on the head end arm festival in addition to, set up middle switching-over pulley on other arm festivals except that the head end arm festival respectively, walk around for strengthening the stay cord, and then utilize to strengthen the stay cord and link together each arm festival. When the lifting telescopic boom frame stretches, the tensioning swing rod swings, the pulling rope is strengthened to slide along with the stretching action of other boom sections except the head end boom section, and the pulling rope is always in a tensioning state to move synchronously along with the middle reversing pulley, so that the self strength of the whole lifting telescopic boom frame can be improved.

It should be noted that, the utility model provides a strengthen stay cord on the flexible cantilever crane of jack-up is a passive stay cord, and it is moved by the arm section tractive of flexible action, and not draw arm section flexible action voluntarily by initiative stay cord, and then can increase the self intensity of flexible cantilever crane of jack-up betterly.

Having described the basic principles of the present invention, various non-limiting embodiments of the invention are described in detail below. Any number of elements in the drawings are by way of example and not by way of limitation, and any nomenclature is used solely for differentiation and not by way of limitation.

The principles and spirit of the present invention will be explained in detail below with reference to a number of representative embodiments of the invention.

The utility model provides an embodiment 1 of work vehicle:

the work vehicle in this embodiment is a mobile crane as shown in fig. 1, and the mobile crane is used for lifting a heavy object to hoist the heavy object to a target position. As shown in fig. 1, the working vehicle specifically includes a chassis 2, and the chassis 2 is provided with road wheels and a walking drive system, and the walking drive system drives the road wheels to rotate, so as to realize movement of the working vehicle. The chassis 2 is also provided with a hoisting device which comprises a rotary table, the rotary table is assembled on the chassis 2 in a rotatable manner along a vertical axis, the rotary table is provided with a hoisting telescopic boom frame 1, the hoisting telescopic boom frame 1 can be adjusted in a telescopic manner, and the rotary table is provided with a pitching oil cylinder to drive the hoisting telescopic boom frame to perform pitching motion. The lifting appliance is assembled at the tail end of the lifting telescopic boom 1, and different lifting appliances can be selected and assembled according to different lifting operation requirements, such as a lifting hook or an electromagnetic chuck. When the lifting appliance is used, the lifting appliance can be adjusted to a target position by controlling the pitching angle and the telescopic length of the lifting telescopic arm frame 1 so as to lift and transport articles.

In this embodiment, the mobile crane employs a wheel-type traveling mechanism. As another implementation means, the mobile crane can also adopt a crawler-type travelling mechanism.

In addition, a cab is usually disposed at one end of the chassis 2, a traveling control mechanism and a lifting control mechanism are disposed in the cab, and when the lifting control mechanism is used, an operator controls the whole working vehicle to advance and retreat, stop and turn by using the traveling control mechanism, and controls the lifting telescopic boom 1 to pitch, stretch and lift by using the lifting control mechanism.

As an implementation mode, the walking control mechanism and the lifting control mechanism in the cab can be manually controlled, and can also be configured into an automatic control system according to actual needs so as to realize automatic walking control and automatic lifting control of the working vehicle.

The chassis, the traveling driving mechanism, the hoisting device and other structures in the mobile crane can all refer to the corresponding structures of the mobile crane in the prior art, for example, the truck crane in CN 204958227U.

The utility model provides a mobile crane's main improvement lies in jack-up telescopic boom 1, and in this embodiment, as shown in fig. 1 to fig. 3, jack-up telescopic boom 1 not only includes a plurality of arm joints of slip suit together, still including the enhancement stay cord 17 that is used for strengthening whole jack-up telescopic boom intensity.

Specifically, the telescopic boom crane comprises a plurality of boom sections, wherein the plurality of boom sections specifically comprise a head end boom section 11, a middle boom section 12 and a tail end boom section 13, wherein the head end boom section 11 is mounted on the rotary table to be assembled on the chassis 2 of the work vehicle, correspondingly, a cylinder for driving the pitching of the telescopic boom crane 1 is also mounted on the rotary table, the middle boom section 12 is slidably sleeved in the head end boom section 11, the tail end boom section 13 is positioned at the tail end of the telescopic boom crane 1 far away from the chassis 2 and slidably sleeved in the middle boom section 12, and thus, the head end boom section 11 and the middle boom section 12 are slidably sleeved together to form a boom section group, for the boom section group, the middle boom section is used as an inner boom section, and the head end boom section is used as an outer boom section. Similarly, the end arm segment 13 and the intermediate arm segment 12 are slidably nested together to form an arm segment set for which the intermediate arm segment 12 serves as the outer arm segment and the end arm segment 13 serves as the inner arm segment.

For the lifting telescopic boom 1, a telescopic driving structure 14 is specially configured, and is used for driving other boom sections except for the head-end boom section to slide so as to adjust the telescopic length of the lifting telescopic boom 1. As shown in fig. 2, in this embodiment, the telescopic driving structure 14 is specifically a hydraulic cylinder driving structure, and one hydraulic cylinder driving structure is configured corresponding to each arm segment, and the hydraulic cylinder driving structure includes a cylinder body and a piston rod. As for the inner arm section and the outer arm section of each arm section group, during assembly, one of the cylinder body and the piston rod is hinged with the inner arm section, the other one of the cylinder body and the piston rod is hinged with the outer arm section, and in the driving and stretching process of the hydraulic cylinder structure, the relative sliding of the inner arm section and the outer arm section in each arm section group is realized.

The structure of the telescopic boom and the telescopic driving structure for driving the telescopic boom to stretch are both in the prior art, and are not described in detail herein. Each arm section in the lifting telescopic arm frame can adopt a structure with a rectangular cross section when in use, also can adopt a structure with an oval cross section and the like, and the utility model does not limit the specific structure of each arm section of the lifting telescopic arm frame.

In order to improve the overall strength of the lifting telescopic boom, a reinforcing pull rope 17 is further arranged on the lifting telescopic boom 1, as shown in fig. 3, the reinforcing pull rope 17 is provided with a first end and a second end, the first end of the reinforcing pull rope 17 is connected to the head-end arm joint 11, the first end is specifically connected to the upper end of the head-end arm joint 11, the mounting is convenient, and the length of the reinforcing pull rope 17 is controlled. A tensioning swing rod 20 is preset on the outer side of the head end arm section 11, the second end of the reinforcing pull rope 17 is connected to the tensioning swing rod 20, and a tensioning driving structure is connected to the tensioning swing rod 20 so as to drive the tensioning swing rod 20 to swing through the tensioning driving structure, so that the reinforcing pull rope 17 is tensioned in the telescopic process of the crane telescopic boom 1. In fig. 3, it can be seen that the middle reversing pulleys are mounted on all the other arm sections except the first-end arm section 11, in other words, the middle reversing pulleys are mounted at the upper end and the lower end of the middle arm section 12 respectively, the middle reversing pulleys are also mounted at the upper end and the lower end of the tail-end arm section 13 respectively, and the middle reversing pulleys are used for the reinforcing pull rope 17 to reverse and bypass, so that the reinforcing pull rope 17 connects all the arm sections together, and further the reinforcing pull rope 17 can be tensioned by controlling the tensioning swing rod 20 to swing in the telescopic process of the telescopic boom 1, so that the reinforcing pull rope synchronously moves along with the middle reversing pulleys when the telescopic boom is telescopic, and finally the strength of the telescopic boom 1 is reinforced.

Specifically, as shown in fig. 3, the intermediate diverting pulleys include a terminal pulley 21 provided on the upper end of the terminal arm section 13, a lower diverting pulley 15 provided on the lower ends of the intermediate arm section 12 and the terminal arm section 13, respectively, and an upper diverting pulley 16 provided on the upper end of the intermediate arm section 12. During assembly, the reinforcing pull rope 17 sequentially passes through the lower end reversing pulley 15 of the middle arm section 12, the upper end reversing pulley 16 of the middle arm section 12, the lower end reversing pulley 15 of the tail end arm section 13 and the tail end pulley 21 along the direction from the first end to the second end, and is finally connected with the tensioning swing rod 20. If the vertical direction in fig. 3 is defined as the up-down direction, the reinforcing cord 17 extends from the upper end of the first arm segment 11, first downward in the axial direction of the intermediate arm segment 12, then upward after passing over the lower end diverting pulley 15 at the lower end of the intermediate arm segment 12, then downward again in the up-down axial direction of the intermediate arm segment 12 after passing over the upper end diverting pulley 16 at the upper end of the intermediate arm segment 12, then upward again after passing over the lower end diverting pulley 15 at the end arm segment 13, and finally is led to the tension lever 20 after passing over the end pulley 21 at the upper end of the end arm segment 13. Based on the sequential sliding fit relationship of the end arm section 13, the middle arm section 12, and the head arm section 11, after the middle arm section 12 and the end arm section 13 contract, a part of the rope section of the reinforcing stay 17 is located in the space between the middle arm section 12 and the end arm section 13, and a part of the rope section is located in the space between the middle arm section 12 and the head arm section 11. After the middle arm segment 12 and the end arm segment 13 are completely extended, most of the reinforcing cord 17 is located outside the head-end arm segment 11 and the middle arm segment 12 except for a small portion of the cord passing around the lower end diverting pulley 15 of the middle arm segment 12 and the lower end diverting pulley 15 of the end arm segment 13.

It should be noted that, as shown in fig. 3, under the action of the intermediate direction-changing pulley, for each arm section, there is a case that the reinforcing pulling rope passes through the arm section after passing around the intermediate direction-changing pulley, and whether passing through or passing out, the tensioned reinforcing pulling rope will always move synchronously with the intermediate direction-changing pulley to pass in and out the arm section. In addition, considering the self structure of the lifting telescopic boom, according to the arrangement position of the middle reversing pulley, a channel can be arranged at the corresponding end part of the lifting telescopic boom to ensure that the corresponding rope section of the reinforcing pull rope can enter and exit the corresponding arm section according to actual needs, so that the arrangement position of the middle reversing pulley and the like can be arranged according to actual needs to ensure that the reinforcing pull rope can wind all the middle reversing pulleys to be connected with all the arm sections.

The tensioning swing rod 20 is hinged and assembled on the outer side of the head end arm joint 11, a swing oil cylinder 28 can be arranged between the tensioning swing rod 20 and the head end arm joint 11, two ends of the swing oil cylinder 28 are correspondingly hinged and connected with the tensioning swing rod 20 and the head end arm joint 11, so that the tensioning swing rod 20 is driven to swing in the stretching process of the swing oil cylinder, the reinforcing pull rope 17 is driven to be tensioned in the stretching process of the lifting telescopic arm frame 1, and the structural strength of the whole lifting telescopic arm frame 1 can be reliably enhanced.

In order to make the tensioning swing rod closer to the head end arm section, as shown in fig. 3, the swing oil cylinder is arranged in a staggered manner with the tensioning swing rod in the circumferential direction of the head end arm section. During specific assembly, connecting seats can be respectively arranged on the tensioning swing rod and the head end arm joint, one end of the swing oil cylinder is hinged with one connecting seat, and the other end of the swing oil cylinder is hinged with the other connecting seat, so that the tensioning swing rod can be reliably driven to swing in the stretching process of the swing oil cylinder.

In the present embodiment, the tension swing rod 20 is specifically a telescopic rod, so that the length of the tension swing rod 20 itself can be adjusted. The hydraulic telescopic cylinder is specifically selected for the tensioning swing rod and hinged to the head end arm joint 11, the tail end of a piston rod serving as an output part is connected with the second end of the reinforcing pull rope 17, and the second end of the reinforcing pull rope 17 can be driven to move and adjust in the telescopic process of the piston rod. The length of the tension swing rod 20 is adjusted, and the tension swing rod 20 can swing to coordinate with the tension swing rod to tension the reinforcing pull rope 17 in a better mode.

In addition, in this embodiment, as shown in fig. 3, for any arm joint group, the outer arm joint is hinged with a support rod 18, the end of the support rod 18 is provided with a sliding member 19, the sliding member 19 here is specifically a sliding sleeve, the sliding sleeve is hinged with the support rod 18, and the reinforcing pull rope 17 is slidably fitted in the sliding sleeve, so that when the tensioning swing rod 20 pulls the second end of the reinforcing pull rope 17 to move, the support rod 18 can be used to provide a supporting force for the rope section in the middle of the reinforcing pull rope 17.

In this embodiment, the support rod has an articulated member and a telescopic member, wherein the articulated member is articulated and assembled to the corresponding outer arm section, the telescopic member is slidably assembled to the articulated member in the axial direction of the support rod, and a sliding sleeve as a sliding member is provided to the telescopic member. When the telescopic boom frame of the crane stretches out and draws back, the sliding piece can be driven to be communicated with the supporting rod to swing along with the sliding of the reinforcing pull rope, and meanwhile, the supporting rod can stretch out and draw back along the axial direction of the supporting rod relative to the hinged piece so as to meet the requirements of the angle change of the reinforcing pull rope and the swing change of the supporting rod.

In addition, a locking structure is further arranged between the telescopic piece and the hinged piece, the locking structure can lock and fix the hinged piece and the telescopic piece together when the telescopic boom of the crane stops telescoping, and can unlock and release the hinged piece and the telescopic piece when the telescopic boom of the crane telescopes. In other words, when the lifting telescopic boom frame performs telescopic action, the locking structure unlocks and releases the hinged element and the telescopic piece, and the support rod can perform telescopic action relative to the hinged element along the axial direction of the support rod, so that the angle swing of the reinforcing pull rope and the support rod is ensured. When the telescopic boom stops stretching, the hinged part and the telescopic part are locked and fixed together, and at the moment, the support rod forms a rigid structure and can reliably support the reinforcing pull rope so as to improve the strength of the whole telescopic boom.

In this embodiment, the locking structure is hydraulic locking structure, and this hydraulic locking structure includes the hydraulic pressure clamp structure, and the hydraulic pressure clamp structure includes two clamps, and two clamp settings are on the articulated elements, and correspond the hydraulic pressure clamp structure configuration hydraulic circuit. When the lifting telescopic boom frame performs telescopic action, the two clamps can be relatively opened, and the telescopic piece can perform telescopic action freely. When the telescopic boom stops telescoping, the two clamps move oppositely to clamp the telescopic part, so that the telescopic part and the hinged part can be fixedly assembled together to ensure the integral rigidity of the support rod.

As the hydraulic lock structure, a hydraulic clamp structure may be employed. In fact, when concrete implementation, hydraulic locking structure can also be other structures, for example, can adopt split clamping structure, this split clamping structure includes the cover body that is equipped with on the articulated elements, be equipped with a plurality of centre gripping lamellas in the cover body, and, for the shrink of convenient guide centre gripping lamella, set up the toper section on the cover body, so that when the centre gripping lamella removed along the cover body, draw close in opposite directions in order to press from both sides tight extensible member by toper section guide centre gripping lamella, in this embodiment, set up the spring in the cover body, the spring specifically adopts the pressure spring, the spring applys the elastic force that forces the centre gripping lamella to remove in order to draw close in opposite directions to the centre gripping lamella, and then conveniently makes the centre gripping lamella draw close in order to press from both sides tight extensible member, realize that the brake is locked. As a configured unlocking scheme, a piston is assembled in a sleeve body in a sealing sliding mode, a hydraulic cavity used for driving the piston to move is further arranged on the sleeve body, when oil is injected into the oil injection cavity, hydraulic oil pushes the piston to reversely push the compression spring, the spring is released from pushing the clamping flap, and therefore unlocking is achieved. And, for convenient assembly, a plurality of centre gripping lamella set up on a centre gripping cover, and spring and piston all act on with holding sheathes, and the spring is used for through applying forward top thrust effort to the centre gripping cover to realize the brake locking, and the piston is then used for through applying reverse top thrust effort to the centre gripping cover, in order to realize the unblock. When the extensible member is fixed in needs hydraulic locking structure locking, with oiling chamber pressure release, the spring orders about the centre gripping cover and is taking the centre gripping lamella to remove, and under the effect of toper section, the centre gripping lamella is drawn close in order to press from both sides tight extensible member in opposite directions, realizes the locking. When the hydraulic locking structure is required to be unlocked, oil is injected into the hydraulic cavity, and the piston is reversely pushed to move to realize unlocking under the condition that the piston overcomes the acting force of the spring.

In this embodiment, in order to optimize the reinforcing effect of the reinforcing ropes 17 on the boom 1, two reinforcing ropes 17 may be symmetrically arranged, and the outer arm joints of the boom 1 are provided with support rods 18 corresponding to the reinforcing ropes 17.

In addition, for optimal control, a controller can be configured for the swing oil cylinder, and the telescopic action of the swing oil cylinder is controlled by controlling a hydraulic oil circuit in time according to the telescopic change of the crane telescopic boom, so that the tensioning swing rod can reliably pull the reinforcing pull rope to ensure that the reinforcing pull rope is reliably tensioned.

The utility model provides an embodiment 2 of work vehicle:

the difference from example 1 is mainly that:

in embodiment 1, the work vehicle is a mobile crane mainly used for lifting heavy objects.

In this embodiment, the working vehicle may be an aerial working vehicle, which also includes a chassis and a lifting telescopic boom, and the specific structure thereof is not described herein again.

Different from the lifting appliance arranged at the tail end of the lifting telescopic boom of the mobile crane, the manned platform is arranged at the tail end of the lifting telescopic boom of the aerial work platform, and is used for carrying people so as to convey people to a high-altitude target position when the lifting telescopic boom is extended and lifted, so that aerial work is realized.

The utility model provides an embodiment 3 of work vehicle:

the difference from the embodiment is mainly that:

in embodiment 1, the crane boom is configured with a head arm section, a middle arm section, and a tail arm section.

In this embodiment, as shown in fig. 4, the boom crane only includes two arm sections, i.e. a first end arm section 11 and a second end arm section 13, the second end arm section 13 is slidably sleeved in the first end arm section 11, and a second end pulley 21 is disposed at an upper end of the second end arm section, and a second end reversing pulley 15 is disposed at a lower end of the second end arm section, so that the first end of the reinforcing pull rope 17 is connected to the first end arm section, and then normally connected to the tension swing rod 20 after sequentially passing through the second end reversing pulley 15 and the second end pulley 21, thereby ensuring that the reinforcing pull rope can be normally tensioned.

In addition, when the length of the lifting telescopic boom is shorter, the supporting rod in the embodiment 1 can be omitted, and the tensioning swing rod is completely used for tensioning the reinforcing pull rope.

As another embodiment, more than two middle arm sections in the telescopic boom support may also be provided, the structure of the two middle arm sections may refer to the structure of the middle arm section in embodiment 1, and the assembly manner thereof may refer to the assembly manner of the end arm section and the middle arm section in the embodiment, and the specific structure is not described herein again. The lower end of each middle arm section is respectively provided with a lower end reversing pulley, and the upper end of each middle arm section is respectively provided with an upper end reversing pulley, so that the reinforcing pull rope can normally pass through each middle reversing pulley, and then all the arm sections are connected together.

As for the lifting telescopic arm frame, all the middle reversing pulleys can be arranged in the corresponding arm sections according to actual requirements, can also be arranged outside the end parts of the corresponding arm sections, can be arranged in a biased manner with the arm sections, and can also be arranged in the middle of the arm sections.

The utility model provides an embodiment 4 of work vehicle:

the difference from example 1 is mainly that:

in embodiment 1, the support rod adopts an outer mounting sleeve and a damping sleeve to form a damping brake structure.

In this embodiment, the damping brake structure adopted by the support rod may specifically be an air spring, the air spring includes an outer cylinder and an inner spring rod, the outer cylinder may be hinged on the outer arm section, and the end of the inner spring rod is provided with a sliding sleeve for the reinforcing pull rope to pass through. Set up the piston on the spring rod, the corresponding cylinder body of piston and external cylinder body forms sealed air cavity, when strengthening the stay cord and taking the flexible action of inner spring rod, compress gradually when diminishing in-process as sealed air cavity, can provide crescent damping force to inner spring rod to realize damping brake function.

The utility model provides an embodiment 5 of work vehicle:

the difference from example 1 is mainly that:

in embodiment 1, two symmetrically distributed reinforcing pull ropes are arranged corresponding to the telescopic boom of the crane in optimizing the force application of the reinforcing pull ropes to the telescopic boom of the crane.

In this embodiment, only one reinforcing cord may be provided, or three or more reinforcing cords may be provided, and the specific number may be arranged according to actual needs.

The utility model provides an embodiment 6 of work vehicle:

the difference from example 1 is mainly that:

in embodiment 1, the first end of the reinforcing cord is connected to the upper end of the head-end arm section, and the reinforcing cord is usually disposed inside the head-end arm section for the convenience of bypassing the reinforcing cord.

In this embodiment, under the circumstances of guaranteeing normal installation, also can connect the first end of strengthening the stay cord in the inboard lower position of head end arm section, but need pay attention to guarantee that the enhancement stay cord reliably walks around the lower extreme switching-over pulley of corresponding arm section, avoid unexpected trouble.

The utility model provides an embodiment 7 of work vehicle:

in embodiment 1, the first end of the reinforcing cord is connected to the upper end of the head-end arm section, and the reinforcing cord is usually disposed inside the head-end arm section for the convenience of bypassing the reinforcing cord.

In this embodiment, can arrange the first end of strengthening the stay cord in the outside of head end arm festival, this moment, can set up top switching-over pulley in the upper end of head end arm festival to in the enhancement stay cord guide that will be in the outside goes into head end arm festival, and then guarantee can normally wind through the lower extreme switching-over pulley of middle arm festival or terminal arm festival.

The utility model provides an embodiment 8 of work vehicle:

the difference from example 1 is mainly that:

in embodiment 1, the telescopic driving structure is a hydraulic cylinder structure, and the hydraulic cylinder structure can refer to the oil cylinder structure in the truck crane disclosed in the utility model patent with the publication number of CN 202936116U.

In this embodiment, flexible drive structure also can adopt wire rope drive structure, and this kind of wire rope drive structure is prior art, specifically can adopt like the wire rope drive structure among six sections jib loading boom telescopic machanisms disclosed in the utility model patent of the publication number of authorizing CN210635631U, perhaps adopts the wire rope drive structure among the double-cylinder rope row telescopic boom disclosed in the utility model patent of the publication number of authorizing CN215854766U, and concrete structure is no longer repeated here.

The utility model provides an embodiment 9 of work vehicle:

the difference from example 1 is mainly that:

in example 1, the swing lever is pulled in as a tension lever to tension the reinforcing cord. The main action of this straining rod is exerted less power to the stay cord is strengthened in the tensioning, conveniently strengthens the stay cord and can be better by the arm section traction movement of flexible action, sets up the straining rod in embodiment 1 and can not influence the driven attribute of strengthening the stay cord.

In this embodiment, as shown in fig. 5 and 6, the tightening rod is a fixed rod 29, the fixed rod 29 is fixed on the head-end arm joint 11, and the fixed rod and the lifting telescopic frame form a set included angle, which can be set according to actual needs, and is generally greater than 0 ° and smaller than 180 °, and the set included angle in fig. 5 is 90 °.

In fig. 6, the corresponding arm segment is extended, and the angle of the reinforcing cord 17 to the fixing rod 29 is adjusted by the support rod 18. It should be noted that, because the arm sections are long, when a plurality of arm sections are exposed, the swing angle of the reinforcing pull rope is small, generally smaller than 10 °, and for the telescopic arm support with a length of about 10 meters or more, the swing change within the small range can ensure that the reinforcing pull rope is in a tensioning state through the telescopic adjustment of the support rod 18.

Under the condition that the tension rod adopts the fixed rod, when other arm sections slide in a telescopic mode, the middle reversing pulley serves as a movable pulley to guide the reinforcing pull rope to move, and the self strength of the whole lifting telescopic arm frame is improved in a tensioning state.

The utility model provides an embodiment of the flexible cantilever crane of jack-up of working vehicle, the flexible cantilever crane of jack-up in this embodiment can adopt the flexible cantilever crane's of jack-up structure in above-mentioned each working vehicle embodiment, specifically no longer gives unnecessary details here.

The utility model provides an embodiment 10 of work vehicle:

in the telescopic boom for the work vehicle in this embodiment, the left and right opposite sides of the telescopic boom are respectively provided with the corresponding reinforcing pull ropes, the reinforcing pull ropes are arranged on the telescopic boom in the above embodiments so as to assemble all the boom sections together, and the corresponding reinforcing pull ropes are respectively provided with the tension rods so as to tension the reinforcing pull ropes, thereby effectively reinforcing the strength of the whole telescopic boom.

In order to improve uniform stress, symmetrical arrangement of a plurality of reinforcing pull ropes on the lifting telescopic boom is generally considered, the pitching swinging direction of the lifting telescopic boom is defined as the vertical direction, the axial direction of the lifting telescopic boom is defined as the front-back direction, and the reinforcing pull ropes can be respectively arranged on the left side and the right side of the lifting telescopic boom when corresponding to the lifting telescopic boom for lifting objects up and down or transporting people, so that the effect of increasing the self strength of the lifting telescopic boom can be achieved, the effect of preventing the lifting telescopic boom from bending sideways can be achieved, and when specific objects are lifted, if the lifting telescopic boom shakes due to side wind, the reinforcing pull ropes on the left side and the right side can reduce the swinging amplitude of the lifting telescopic boom, so that the lifting telescopic boom is more stable.

In the above embodiments, the work vehicle may be a mobile crane or an aerial lift truck. In other embodiments, the working vehicle may be used for other purposes, such as fire fighting at high altitudes, as long as the telescopic boom of the working vehicle is the telescopic boom of any of the above embodiments, which should fall within the protection scope of the present invention.

In light of the foregoing description of the present specification, those skilled in the art will also understand that terms used herein, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "central," "longitudinal," "lateral," "clockwise," or "counterclockwise," etc., indicate that terms of orientation or positional relationship are based on those shown in the drawings herein for convenience of explanation and simplicity of description, but do not indicate or imply that the device or element concerned must have the particular orientation, be constructed and operated in the particular orientation, and therefore are not to be understood or construed as limiting upon the inventive arrangements.

In addition, the terms "first" or "second", etc. used in this specification are used to refer to numbers or ordinal terms for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present specification, "a plurality" means at least two, for example, two, three or more, and the like, unless specifically defined otherwise.

While various embodiments of the present invention have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous modifications, changes, and substitutions will occur to those skilled in the art without departing from the spirit and scope of the present invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. The following claims are intended to define the scope of the invention and to cover module components, equivalents, or alternatives falling within the scope of these claims.

Claims (15)

1. A boom extension of a work vehicle, comprising:

the crane comprises at least two arm sections which are sequentially sleeved together in a sliding manner, wherein the at least two arm sections comprise a head-end arm section (11) which is used for being installed on a chassis of an operation vehicle and a tail-end arm section (13) which is positioned at one end of the crane telescopic arm frame far away from the chassis;

the telescopic driving structure (14) is used for driving other arm sections except the head end arm section to slide so as to drive the lifting telescopic arm frame to stretch;

it is characterized in that the hoisting telescopic arm support further comprises:

the first end of the reinforcing pull rope (17) is connected to the head-end arm section (11), the second end of the reinforcing pull rope is connected with the tensioning rod arranged on the head-end arm section, middle reversing pulleys are arranged on other arm sections except the head-end arm section, so that the reinforcing pull rope can be reversed and wound, all the arm sections are connected through the reinforcing pull rope, the strength of the lifting telescopic arm frame is enhanced when the reinforcing pull rope is tensioned, and the middle reversing pulleys comprise tail end pulleys (21) which are arranged at the upper end of the tail-end arm section (13) and used for guiding the reinforcing pull rope to the tensioning rod;

the tensioning rod adopts the following scheme:

the tensioning rod is a fixed rod, and the fixed rod and the lifting telescopic arm frame are arranged at a set angle; or

The tensioning rod is a tensioning swing rod (20), the tensioning swing rod is hinged to the head end arm joint, the tensioning swing rod is in transmission connection with a tensioning driving structure, the tensioning driving structure drives the tensioning swing rod to swing so as to tension the reinforcing pull rope, and therefore the reinforcing pull rope can move synchronously along with all the middle reversing pulleys when the lifting telescopic arm frame stretches.

2. The boom extension of a work vehicle according to claim 1, wherein the boom extension is formed by the head end arm segment (11) and the tail end arm segment (13), the intermediate diverting pulley further comprises a lower diverting pulley (15) provided at a lower end of the tail end arm segment, and the reinforcing cord (17) is sequentially routed around the lower diverting pulley (15) and the tail end pulley (21) in an extending direction from the first end to the second end.

3. The boom extension crane of claim 1, wherein all the arm sections of the boom extension crane comprise the head arm section (11), the tail arm section (13) and at least one middle arm section (12), the middle direction-changing pulley further comprises a lower direction-changing pulley (15) respectively provided at the lower end of the middle arm section (12) and the lower end of the tail arm section, and an upper direction-changing pulley (16) provided at the upper end of the middle arm section, and the reinforcing rope (17) sequentially passes through the lower direction-changing pulley of the middle arm section, the upper direction-changing pulley of the middle arm section, the lower direction-changing pulley of the tail arm section and the tail pulley (21) in the direction from the first end to the second end.

4. The boom extension crane for a working vehicle according to claim 1, 2 or 3, characterized in that the first end of the reinforcement rope (17) is connected to the upper end of the head-end arm section (11).

5. The boom extension crane of a working vehicle according to claim 1, 2 or 3, characterized in that the second end of the reinforcing pull rope (17) is connected to the end of the tension swing rod (20), and the tension swing rod (20) is driven to swing by a swing cylinder (28).

6. The boom extension system of working vehicle as claimed in claim 1, 2 or 3, wherein a sliding member is provided on the tension lever (20), the sliding member is connected to the second end of the reinforcing rope, and the sliding member is driven by a sliding driving structure to move, so that the sliding member carries the second end of the reinforcing rope to slide along the tension lever in a reciprocating manner.

7. The telescopic boom for the working vehicle as claimed in claim 1, 2 or 3, wherein two of all the boom sections of the telescopic boom for the lifting are slidably sleeved together to form a boom section group, one boom section of any boom section group is an outer boom section, the other boom section is an inner boom section, a support rod (18) is hinged to the outer boom section of all the boom section groups of the telescopic boom for the lifting, a sliding member (19) is arranged at the end of the support rod (18), and the sliding member (19) is slidably assembled on the reinforcing pull rope (17).

8. The lifting telescopic boom support of a working vehicle according to claim 7, characterized in that the glide (19) is a sliding sleeve, which is hingedly assembled with the support bar.

9. The boom extension of a work vehicle of claim 7, wherein the glide is slidably adjustable in the strut shaft direction relative to a hinge point at which the strut is hinged to the respective outer arm section.

10. The boom extension system of a working vehicle according to claim 9, wherein the support rod has a hinge member and a telescopic member slidably assembled together in an axial direction of the support rod, and a locking structure for locking and fixing the hinge member and the telescopic member when the boom extension system stops extending and retracting and unlocking the boom extension system when the boom extension system extends and retracts, the hinge member is used for being hinged to the corresponding outer arm section, and the sliding member is provided on the telescopic member.

11. The boom system of claim 10, wherein the locking structure is a hydraulic locking structure.

12. The boom crane of work vehicle as claimed in claim 7, characterized in that there are at least two reinforcing cables (17), and the outer arm segment of the boom crane is provided with the support bar (18) corresponding to each reinforcing cable.

13. The boom of claim 1, 2 or 3, wherein the reinforcing pull ropes are symmetrically distributed on two opposite sides of the boom, and the tension rods are respectively arranged corresponding to the reinforcing pull ropes.

14. A work vehicle, characterized by comprising:

chassis on which a boom (1) of a work vehicle according to any of claims 1-13 is mounted.

15. The work vehicle of claim 14, wherein the work vehicle is an aerial lift truck or a mobile hoist crane.

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