CN112357787A

CN112357787A - Lifting equipment

Info

Publication number: CN112357787A
Application number: CN202011352115.9A
Authority: CN
Inventors: 彭莉珊; 何健洪; 李丽丽
Original assignee: Hangzhou Fuchun Industry Co ltd
Current assignee: Hangzhou Fuchun Industry Co ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-02-12

Abstract

The invention belongs to the field of hoisting, and particularly relates to hoisting equipment which comprises a crane, a fixed rod, a supporting rod, a hydraulic column, a supporting sleeve, an internal thread sleeve, a screw, a spring B, an electric drive module and a universal wheel mechanism, wherein the fixed rod is vertically arranged on one section of the tail end of a telescopic arm of the crane, and the tail end of the fixed rod is hinged with the supporting rod; according to the invention, the telescopic arm of the crane can effectively hoist dispersed objects far away from the crane, and in the process that the telescopic arm of the crane hoists the objects far away and pulls the objects near, the telescopic structure formed by the support rod and the support sleeve automatically adjusts the support formed by the telescopic arm according to the concave-convex condition of the road surface and the weight of the hoisted heavy object, so that the telescopic structure formed by the support rod and the support sleeve always generates effective support force on the telescopic arm in an extension state, the telescopic arm is prevented from being deformed due to the weak strength of the telescopic arm in the extension state when the telescopic arm hoists the objects far away, and the service life of the telescopic arm is prolonged.

Description

Lifting equipment

Technical Field

The invention belongs to the field of hoisting, and particularly relates to hoisting equipment.

Background

The Crane is a common name of a Crane, and the Crane (Crane) is one of hoisting machines and is a machine which does cyclic and intermittent motion. One cycle of operation includes the picking device lifting the article from the picking location and then moving horizontally to the desired location to lower the article, followed by a reverse motion to return the picking device to its original position for the next cycle.

The conventional crane mainly includes a crane having a telescopic boom, and the telescopic boom crane extends the telescopic boom to perform a lifting operation during use. Traditional flexible arm crane can't carry out effectual lifting by crane to the article far away from crane own distance, but must just lift by crane the article far away from through the position of whole removal crane, and this kind of efficiency to the mode of lifting by crane of remote article is lower, and is inconvenient.

The invention designs a lifting device to solve the problems.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention discloses a lifting device which is realized by adopting the following technical scheme.

In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention conventionally use, which are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, or be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

A lifting device comprises a crane, a fixed rod, a supporting rod, a hydraulic column, a supporting sleeve, an internal thread sleeve, a screw, a spring A, a sliding block A, a spring B, an electric drive module and a universal wheel mechanism, wherein the fixed rod is vertically arranged on one section of the tail end of a telescopic arm of the crane, the supporting rod is hinged to the tail end of the fixed rod, and the hydraulic column arranged on one section of the tail end of the telescopic arm drives the supporting rod to swing and expand or recover around the fixed rod; one end of the hydraulic column is hinged with one section of the tail end of the telescopic arm, and the other end of the hydraulic column is hinged with a sliding block A which slides on the side wall of the supporting rod along the relative telescopic direction of the supporting rod and the supporting sleeve; a spring A for resetting the sliding block A is arranged on the sliding block A; a structure for locking the unfolding states of the supporting rod and the fixed rod is arranged between the supporting rod and the fixed rod and is driven by the sliding block A; the support rod is in sliding fit with a support sleeve, the output shaft of the electric drive module arranged in the support sleeve is provided with a screw, and an internal thread sleeve sliding in the support sleeve is in threaded fit with the screw; the internal thread sleeve is connected with the tail end of the supporting rod through a compressed spring B, and a pressure sensor for sensing the pressure of the spring B is arranged in the internal thread sleeve; four universal wheel mechanisms matched with the ground are symmetrically arranged at the tail end of the supporting sleeve.

The universal wheel mechanism comprises a fixed sleeve, a rotating shaft, a long square frame, a sliding block B and rollers, wherein the rotating shaft is fixedly arranged in the fixed sleeve at the tail end of the supporting sleeve in a rotating fit mode, the long square frame is arranged at the tail end of the rotating shaft, the sliding block B is arranged in the long square frame in a sliding fit mode along the horizontal direction, and two autorotation rollers are symmetrically arranged on two sides of the sliding block B.

As a further improvement of the technology, a rack A slides in the support rod along the relative telescopic direction of the support rod and the support sleeve, the rack A is fixedly connected with a slide block A, and the rack A and a rack B which slides in the support rod in parallel with the rack A are simultaneously meshed with a gear arranged in the support rod; one end of the rack B is matched with the limiting groove on the arc surface at the tail end of the fixed rod so as to lock the unfolding state of the support rod relative to the fixed rod.

As a further improvement of the technology, the slide block A is provided with a trapezoidal guide block which slides in a trapezoidal guide groove on the support rod. The trapezoidal guide block is matched with the trapezoidal guide groove to play a positioning and guiding role in the sliding of the sliding block A on the side wall of the supporting rod. The gear rotates in the accommodating groove in the supporting rod, the rack A slides in the sliding groove A in the supporting rod, and the rack B slides in the sliding groove B in the supporting rod. The holding tank provides accommodation space for the gear, and spout A plays the location guide effect to the motion performance of rack A in the bracing piece, and spout B plays the location guide effect to the motion performance of rack B in the bracing piece.

As a further improvement of the technology, the tail end of the support sleeve is provided with a base, and a fixed sleeve in each universal wheel mechanism is fixedly arranged on the base; the rotating shaft is provided with a circular ring B which rotates in a circular groove on the inner wall of the corresponding fixed sleeve. The ring B ensures that the rotating shaft and the fixed sleeve only rotate relatively and do not move axially relatively. Two guide blocks B are symmetrically arranged on the sliding block B and respectively slide in two guide grooves B on the inner wall of the rectangular frame; two fixed shafts are symmetrically arranged on two sides of the sliding block B, and two rollers in each universal wheel mechanism are symmetrically arranged on the two fixed shafts. The guide block B is matched with the guide groove B to play a positioning and guiding role in the sliding of the sliding block B in the rectangular frame.

As a further improvement of the technology, the support rod is symmetrically provided with two guide blocks A, and the two guide blocks A respectively slide in two guide grooves A on the inner wall of the support sleeve. The cooperation of guide block A and guide way A plays the positioning guide effect to the relative sliding fit of bracing piece and support cover, guarantees simultaneously that the bracing piece can not break away from and supports the cover. The fixed rod is provided with an L-shaped swing limiting rod matched with the supporting rod, and the swing limiting rod limits the expansion range of the supporting sleeve and the supporting rod relative to the fixed rod, so that the supporting rod only swings for 90 degrees from a recovery state to an expansion state, and the supporting rod and the supporting sleeve are guaranteed to effectively support the crane telescopic arm. A rotary seat which is rotationally matched with the screw rod is fixedly arranged in the supporting sleeve, and a circular ring A arranged on the screw rod rotates in a circular groove on the inner wall of the rotary seat.

As a further improvement of the present technology, the spring a is an extension spring; one end of the spring A is connected with a fixed block arranged on the supporting rod, and the other end of the spring A is connected with the sliding block A; the spring a is always in tension.

Compared with a traditional crane, the telescopic arm of the crane can effectively hoist dispersed objects far away from the crane, and in the process that the telescopic arm of the crane hoists the objects far away and pulls the objects near, the telescopic structure formed by the support rod and the support sleeve automatically adjusts the support formed by the telescopic arm according to the concave-convex condition of the road surface and the weight of a hoisted heavy object, so that the telescopic structure formed by the support rod and the support sleeve always generates effective support force for the telescopic arm in an extension state, the telescopic arm is prevented from being deformed due to the fact that the strength of the telescopic arm in the extension state is weaker when the telescopic arm hoists the objects far away, and the service life of the telescopic arm is prolonged.

When the crane is used for hoisting long-distance articles, the whole position of the crane does not need to be adjusted, so that the efficiency of hoisting the articles far away from the crane is improved, and compared with the traditional crane, the crane provided by the invention firstly draws the articles far away through the telescopic arm and then hoists the articles, so that the safety of hoisting the articles far away is improved.

The invention has simple structure and better use effect.

Drawings

Fig. 1 is a schematic view of the invention from two general perspectives.

Fig. 2 is a partial schematic view of the present invention.

Fig. 3 is a schematic cross-sectional view of the fixed rod, the support rod, the slide block a, the rack a, the gear and the rack B.

Fig. 4 is a schematic cross-sectional view of the support rod, spring B, internal thread bushing, screw, electric drive module, and support bushing.

FIG. 5 is a schematic cross-sectional view of the gimbal mechanism from two perspectives.

Fig. 6 is a schematic cross-sectional view of a support sleeve.

Fig. 7 is a schematic sectional view of the support rod and a part thereof.

Fig. 8 is a schematic view of a fixation rod.

Fig. 9 is a schematic cross-sectional view of the support rod, the slide block a and the hydraulic column.

Number designation in the figures: 1. a crane; 2. a telescopic arm; 3. hooking; 4. fixing the rod; 5. a limiting groove; 6. a support bar; 7. a trapezoidal guide groove; 8. a chute A; 9. accommodating grooves; 10. a chute B; 11. a guide block A; 12. a slide block A; 13. a trapezoidal guide block; 14. a rack A; 15. a gear; 16. a rack B; 17. a spring A; 18. a fixed block; 19. a hydraulic column; 20. a swing limiting rod; 21. a support sleeve; 22. a guide groove A; 23. an internal thread sleeve; 24. a screw; 25. a spring B; 26. a rotating base; 27. a circular ring A; 28. an electric drive module; 29. a base; 30. a universal wheel mechanism; 31. fixing a sleeve; 32. a rotating shaft; 33. a circular ring B; 34. a long square frame; 35. a guide groove B; 36. a slide block B; 37. a guide block B; 38. a fixed shaft; 39. and a roller.

Detailed Description

The drawings are schematic illustrations of the implementation of the present invention to facilitate understanding of the principles of structural operation. The specific product structure and the proportional size are determined according to the use environment and the conventional technology.

As shown in fig. 1, 2 and 5, the lifting device comprises a crane 1, a fixed rod 4, a support rod 6, a hydraulic column 19, a support sleeve 21, an internal thread sleeve 23, a screw 24, a spring a17, a slider a12, a spring B25, an electric drive module 28 and a universal wheel mechanism 30, wherein as shown in fig. 1, 2 and 3, the fixed rod 4 is vertically installed on one section of the tail end of a telescopic arm 2 of the crane 1, the support rod 6 is hinged to the tail end of the fixed rod 4, and the hydraulic column 19 installed on one section of the tail end of the telescopic arm 2 drives the support rod 6 to swing and unfold or retract around the fixed rod 4; one end of the hydraulic column 19 is hinged with the tail end of the telescopic arm 2, and the other end is hinged with a slide block A12 which slides on the side wall of the support rod 6 along the relative telescopic direction of the support rod 6 and the support sleeve 21; a spring A17 for resetting the sliding block A12 is arranged on the sliding block A12; a structure for locking the unfolding state of the supporting rod 6 and the fixed rod 4 is arranged between the supporting rod and the fixed rod, and the structure is driven by a slide block A12; as shown in fig. 2 and 4, the support rod 6 is slidably fitted with a support sleeve 21, an output shaft of an electric drive module 28 installed in the support sleeve 21 is provided with a screw 24, and an internal thread sleeve 23 sliding in the support sleeve 21 is in threaded fit with the screw 24; the internal thread sleeve 23 is connected with the tail end of the support rod 6 through a compressed spring B25, and a pressure sensor for sensing the pressure of the spring B25 is arranged in the internal thread sleeve 23; as shown in fig. 2 and 5, four universal wheel mechanisms 30 matched with the ground are symmetrically arranged at the tail end of the support sleeve 21.

As shown in fig. 5, the universal wheel mechanism 30 includes a fixed sleeve 31, a rotating shaft 32, a long square frame 34, a sliding block B36, and rollers 39, wherein the rotating shaft 32 is rotatably fitted in the fixed sleeve 31 fixed at the end of the support sleeve 21, the long square frame 34 is installed at the end of the rotating shaft 32, the sliding block B36 is slidably fitted in the long square frame 34 along the horizontal direction, and two autorotation rollers 39 are symmetrically installed at two sides of the sliding block B36.

As shown in fig. 4, a rack a14 slides in the support bar 6 along the relative extension direction of the support bar 6 and the support sleeve 21, the rack a14 is fixedly connected with a slide block a12, and the rack a14 and a rack B16 sliding in the support bar 6 parallel to the rack a14 are simultaneously meshed with a gear 15 installed in the support bar 6; as shown in fig. 4 and 8, one end of the rack B16 is engaged with the limiting groove 5 on the arc surface of the end of the fixing rod 4 to lock the unfolding state of the supporting rod 6 relative to the fixing rod 4.

As shown in fig. 3, 7 and 9, the trapezoidal guide block 13 is mounted on the slider a12, and the trapezoidal guide block 13 slides in the trapezoidal guide groove 7 of the support bar 6. The cooperation of the trapezoidal guide block 13 and the trapezoidal guide groove 7 plays a positioning and guiding role in the sliding of the slide block A12 on the side wall of the support bar 6. The gear 15 rotates in the accommodating groove 9 in the support bar 6, the rack a14 slides in the sliding groove A8 in the support bar 6, and the rack B16 slides in the sliding groove B10 in the support bar 6. The accommodating groove 9 provides an accommodating space for the gear 15, the sliding groove A8 plays a positioning and guiding role in the movement of the rack a14 in the supporting rod 6, and the sliding groove B10 plays a positioning and guiding role in the movement of the rack B16 in the supporting rod 6.

As shown in fig. 2 and 5, a base 29 is installed at the end of the support sleeve 21, and a fixed sleeve 31 in each universal wheel mechanism 30 is fixedly installed on the base 29; the rotating shaft 32 is provided with a ring B33, and the ring B33 rotates in a ring groove on the inner wall of the corresponding fixed sleeve 31. The ring B33 ensures that the shaft 32 and the sleeve 31 only rotate relatively and do not move axially relatively. Two guide blocks B37 are symmetrically arranged on the sliding block B36, and the two guide blocks B37 respectively slide in two guide grooves B35 on the inner wall of the rectangular frame 34; the two fixed shafts 38 are symmetrically installed on both sides of the slider B36, and the two rollers 39 in each universal wheel mechanism 30 are symmetrically installed on the two fixed shafts 38. The engagement of the guide block B37 with the guide groove B35 serves as a positioning guide for the sliding movement of the slider B36 in the rectangular frame 34.

As shown in fig. 4 and 6, two guide blocks a11 are symmetrically mounted on the support rod 6, and the two guide blocks a11 slide in two guide grooves a22 on the inner wall of the support sleeve 21. The cooperation of the guide block a11 and the guide groove a22 plays a positioning and guiding role in the relative sliding fit between the support bar 6 and the support sleeve 21, and simultaneously ensures that the support bar 6 cannot be separated from the support sleeve 21. As shown in fig. 3, an L-shaped swing-limiting rod 20 engaged with the supporting rod 6 is mounted on the fixing rod 4, and the swing-limiting rod 20 limits the expansion range of the supporting sleeve 21 and the supporting rod 6 relative to the fixing rod 4, so that the supporting rod 6 only swings 90 degrees from the recovery state to the expansion state, thereby ensuring the effective support of the supporting rod 6 and the supporting sleeve 21 on the telescopic arm 2 of the crane 1. As shown in fig. 4, a rotary seat 26 rotatably engaged with the screw 24 is fixedly installed in the support sleeve 21, and a ring a27 installed on the screw 24 rotates in a ring groove on the inner wall of the rotary seat 26.

As shown in fig. 3, the spring a17 is an extension spring; one end of the spring A17 is connected with a fixed block 18 arranged on the supporting rod 6, and the other end is connected with a sliding block A12; spring a17 is always in tension.

The electric drive module 28 in the present invention consists of a servo motor, a reducer and a control unit.

Lubricating oil is coated on the round-head cambered surface of the fixing rod 4.

The rotary seat 26 rotatably engaged with the screw 24 in the present invention provides a supporting function for the screw 24 toward the support rod 6.

The working process of the invention is as follows: in an initial state, the telescopic arm 2 is retracted into the crane 1, the support rod 6 and the support sleeve 21 are in a retracted state parallel to the telescopic arm 2, the hydraulic column 19 belongs to a shortest retracted state, the tail end of the rack B16 is abutted against the cambered surface of the round end of the fixed rod 4, the spring A17 is in a stretched state, and the spring B25 is in a compressed state.

When the invention is needed to hoist dispersed articles far away from the crane 1, the telescopic arm 2 is horizontally swung out of the crane 1 and extended to the article placing position, and the hook 3 positioned right above the articles is placed downwards and hooked on the articles.

Then, the hydraulic column 19 is controlled to extend, the extended hydraulic column 19 drives the sliding block A12 to slide from the side of the supporting sleeve 21 to the side of the fixed rod 4, the spring A17 releases energy and contracts, and the sliding block A12 drives the tail end of the rack B16 to be separated from the round-head cambered surface of the fixed rod 4 through the rack A14 and the gear 15. When the slide block A12 slides along the outer side of the support rod 6 to the limit position, the continuously extending hydraulic column 19 drives the support rod 6 and the support sleeve 21 to swing and expand in the direction perpendicular to the telescopic arm 2 through the slide block A12.

With the continued extension of the hydraulic column 19 and the relative swinging of the hydraulic column 19 and the support rod 6, when the hydraulic column 19 crosses the vertical state with the support rod 6, the continued extension of the hydraulic column 19 drives the sliding block a12 to slide along the outer side of the support rod 6 from the side of the fixed rod 4 to the direction of the support sleeve 21, and the spring a17 is further stretched to store energy. The slide block A12 drives one end of the rack B16 to abut against the round head cambered surface of the fixed rod 4 through the rack A14 and the gear 15. With the swinging of the support bar 6, one end of the rack B16 is slidingly rubbed with the round head arc surface of the fixed bar 4.

When the support rod 6 and the support sleeve 21 swing to a state perpendicular to the telescopic arm 2 along with the extension of the hydraulic column 19, one end of the rack B16 is just opposite to the limit groove 5 on the round-head cambered surface of the fixed rod 4, the support rod 6 abuts against the limit swing rod 20 and stops swinging, the hydraulic column 19 which continues to extend drives the slide block A12 to continue to slide from one side of the fixed rod 4 to the direction of the support sleeve 21, and the slide block A12 is inserted into the limit groove 5 on the round-head cambered surface of the fixed rod 4 through one end of a series of driving racks B16 and forms locking for the perpendicular state of the fixed rod 4 and the support rod 6. When the movement of the rack B16 reaches a limit, the slide of the slider a12 to the side of the support sleeve 21 reaches a limit, and the extension of the hydraulic cylinder 19 stops.

At this time, the control system controls the electric drive module 28 to operate, the output shaft of the electric drive module 28 drives the screw 24 to rotate rapidly, the screw 24 drives the internal thread sleeve 23 in threaded fit with the screw to move towards the support rod 6, the internal thread sleeve 23 drives the support sleeve 21 to extend towards the ground relative to the support rod 6 through the spring a17, and the spring a17 releases energy and extends. When the four rollers 39 in the four universal wheel mechanisms 30 mounted on the base 29 are against the ground, the control system controls the electric drive module 28 to stop operating.

Then, the control system controls the crane 1 to lift the article hooked by the hook 3 off the ground through a recycled steel wire, in the process that the article is lifted off the ground, the vertical downward pulling force applied to the tail end of the telescopic arm 2 is gradually increased, along with the increase of the pulling force applied to the tail end of the telescopic arm 2 in the horizontal state, the telescopic arm 2 with small deformation under the action of the article drives the supporting rod 6 to increase the pressure of the supporting rod 6 on the spring A17 through the fixing rod 4, the spring A17 is gradually compressed and stored with energy, the pressure sensor in the internal thread sleeve 23 senses the increase change of the acting force of the spring A17 and generates an electric signal, the control system receives the electric signal generated by the pressure sensor and controls the electric driving module 28 to operate, the electric driving module 28 further compresses and stores energy on the spring A17 through the screw rod 24 and the internal thread sleeve 23 and offsets the moment generated by the article on the telescopic arm 2, and the deformation of the telescopic arm 2 in the horizontal state due to the The weakening is realized, so that the telescopic arm 2 in the horizontal state is prevented from deforming in the process of lifting the articles off the ground, the telescopic arm 2 is protected from being damaged, and the service life of the telescopic arm 2 is prolonged.

When the moment generated by the spring force generated by the further compression of the spring a17 on the telescopic arm 2 is equal to the moment generated by the article lifted from the ground on the telescopic arm 2, the control system controls the electric drive module 28 to stop operating.

Then, the crane 1 control system controls the telescopic arm 2 to contract and horizontally pull the article lifted off the ground to the crane 1 direction, so that the telescopic arm 2 can continuously lift the article, the moment generated by the article when the telescopic arm 2 lifts the article is reduced to the maximum extent, the telescopic arm 2 can lift the article more easily, the power of the crane 1 for lifting the article is reduced, and the energy loss in the lifting process of the crane 1 is reduced.

Along with the telescopic arm 2 is contracted and pulls the object to the crane 1 direction, the telescopic arm 2 drives the support rod 6 and the support sleeve 21 to move synchronously through the fixed rod 4, the support sleeve 21 drives the four universal mechanisms to move synchronously through the base 29, and the roller 39 in the universal mechanism 30 rolls on the ground and effectively supports the telescopic arm 2.

When the four universal wheel mechanisms 30 arranged on the base 29 meet a ground pit, the four universal wheel mechanisms 30 are suspended instantaneously, under the action of the spring A17, the internal thread sleeve 23 drives the support sleeve 21 to vertically extend downwards through the screw 24 and the rotary seat 26, the spring A17 releases energy and extends instantaneously, the pressure sensed by the pressure sensor in the internal thread sleeve 23 is reduced and transmits a generated electric signal to the control system, the control system controls the electric drive module 28 to operate, the electric drive module 28 drives the internal thread sleeve 23 through the screw 24 to compress and store energy for the spring A17 again, so that the moment generated by the elastic force generated by the spring A17 on the telescopic arm 2 through the support rod 6 is equal to the moment generated by an object lifted off the ground, the telescopic arm 2 is ensured to keep moment balance all the time in the contraction process, and the deformation of the telescopic arm 2 caused by the moment generated by the object lifted off the ground is avoided, thereby prolonging the service life of the telescopic boom 2.

When the four universal wheel mechanisms 30 installed on the base 29 cross the ground pit, the four universal wheel mechanisms 30 instantaneously generate vertical upward movement, the four universal wheel mechanisms 30 drive the internal thread sleeve 23 to vertically move upward through the base 29, the supporting sleeve 21, the rotating seat 26 and the screw 24, and the spring A17 is further compressed to store energy. The pressure sensed by the pressure sensor in the internal thread sleeve 23 is increased and the generated electric signal is transmitted to the control system, the control system controls the electric drive module 28 to operate, the electric drive module 28 drives the internal thread sleeve 23 to vertically move downwards relative to the support sleeve 21 through the screw 24, the spring A17 quickly releases part of energy, and the elastic force of the spring A17 is reduced, so that the moment generated by the elastic force of the spring A17 on the telescopic arm 2 through the support rod 6 is equal to the moment generated by an object lifted off the ground.

When the four universal wheel mechanisms 30 installed on the base 29 meet the ground bulge, the four universal wheel mechanisms 30 instantaneously generate vertical upward movement, the four universal wheel mechanisms 30 drive the internal thread sleeve 23 to vertically move upward through the base 29, the supporting sleeve 21, the rotating seat 26 and the screw 24, and the spring A17 is further compressed to store energy. The pressure that the pressure sensor in the internal thread cover 23 felt increases and transmits the signal of telecommunication that produces for control system, control system control electricity drives module 28 operation, electricity drives module 28 through screw rod 24 and drives internal thread cover 23 for supporting the vertical downstream of cover 21, spring A17 releases some energy fast, the elasticity of spring A17 reduces, make the produced moment of elasticity of spring A17 to telescopic boom 2 through bracing piece 6 and produced moment equal with the article that hangs off from the ground, guarantee telescopic boom 2 and keep moment balance throughout the contraction process, avoid telescopic boom 2 to take place to warp because of the moment that the article that hangs off from the ground produced, thereby the life of telescopic boom 2 is prolonged.

When the four universal wheel mechanisms 30 installed on the base 29 cross the ground and protrude, the four universal wheel mechanisms 30 are suspended instantaneously, under the action of the spring a17, the internal thread sleeve 23 drives the support sleeve 21 to extend vertically downward through the screw 24 and the rotary seat 26, the spring a17 releases energy and extends instantaneously, the pressure sensed by the pressure sensor in the internal thread sleeve 23 is reduced, the generated electric signal is transmitted to the control system, the control system controls the electric drive module 28 to operate, the electric drive module 28 drives the internal thread sleeve 23 through the screw 24 to compress and store energy for the spring a17 again, and the moment generated by the elastic force generated by the spring a17 on the telescopic arm 2 through the support rod 6 is equal to the moment generated by an object lifted from the ground.

When the telescopic arm 2 drives the universal wheel mechanism 30 to horizontally move in the opposite direction, the sliding block B36 can horizontally slide in the corresponding square frame, so that the universal wheel mechanism 30 does not need to swing firstly and then drive the support sleeve 21 to horizontally move in a straight line, the reverse movement efficiency of the universal wheel is ensured, and the jerking feeling caused by the fact that the universal wheel mechanism 30 needs to swing to perform reverse straight line movement is avoided.

The threaded engagement of the internally threaded sleeve 23 and the threaded rod 24 of the present invention provides a self-locking action that ensures that the position of the internally threaded sleeve 23 within the support sleeve 21 does not move freely without the electric drive module 28 operating.

In conclusion, the beneficial effects of the invention are as follows: according to the invention, the telescopic arm 2 of the crane 1 can effectively hoist dispersed articles far away from the crane 1, and in the process that the telescopic arm 2 of the crane 1 hoists the articles far away and pulls the articles near, the telescopic structure formed by the support rod 6 and the support sleeve 21 can automatically adjust the support formed by the telescopic arm 2 according to the concave-convex condition of the road surface and the weight of a hoisted heavy object, so that the telescopic structure formed by the support rod 6 and the support sleeve 21 can always generate effective support force on the telescopic arm 2 in an extension state, the telescopic arm 2 is prevented from being deformed due to the weak strength of the telescopic arm 2 in the extension state when the articles far away are hoisted, and the service life of the telescopic arm 2 is prolonged.

When the crane is used for hoisting long-distance articles, the whole position of the crane 1 is not required to be adjusted, so that the efficiency of hoisting the articles far away from the crane 1 is improved, and compared with the traditional crane 1, the crane is used for hoisting the articles far away from the crane by drawing the articles far away through the telescopic arm 2, so that the safety of hoisting the articles far away from the crane is improved.

Claims

1. A lifting apparatus, characterized in that: the device comprises a crane, a fixed rod, a supporting rod, a hydraulic column, a supporting sleeve, an internal thread sleeve, a screw rod, a spring A, a sliding block A, a spring B, an electric drive module and a universal wheel mechanism, wherein the fixed rod is vertically arranged on one section of the tail end of a telescopic arm of the crane, the supporting rod is hinged to the tail end of the fixed rod, and the hydraulic column arranged on one section of the tail end of the telescopic arm drives the supporting rod to swing and expand or recover around the fixed rod; one end of the hydraulic column is hinged with one section of the tail end of the telescopic arm, and the other end of the hydraulic column is hinged with a sliding block A which slides on the side wall of the supporting rod along the relative telescopic direction of the supporting rod and the supporting sleeve; a spring A for resetting the sliding block A is arranged on the sliding block A; a structure for locking the unfolding states of the supporting rod and the fixed rod is arranged between the supporting rod and the fixed rod and is driven by the sliding block A; the support rod is in sliding fit with a support sleeve, the output shaft of the electric drive module arranged in the support sleeve is provided with a screw, and an internal thread sleeve sliding in the support sleeve is in threaded fit with the screw; the internal thread sleeve is connected with the tail end of the supporting rod through a compressed spring B, and a pressure sensor for sensing the pressure of the spring B is arranged in the internal thread sleeve; four universal wheel mechanisms matched with the ground are symmetrically arranged at the tail end of the supporting sleeve;

2. The hoisting apparatus of claim 1, wherein: a rack A slides in the support rod along the relative telescopic direction of the support rod and the support sleeve, the rack A is fixedly connected with the sliding block A, and the rack A and a rack B which slides in the support rod in parallel with the rack A are simultaneously meshed with a gear arranged in the support rod; one end of the rack B is matched with the limiting groove on the arc surface at the tail end of the fixed rod so as to lock the unfolding state of the support rod relative to the fixed rod.

3. A lifting apparatus as claimed in claim 2, wherein: the slide block A is provided with a trapezoidal guide block which slides in a trapezoidal guide groove on the support rod; the gear rotates in the accommodating groove in the supporting rod, the rack A slides in the sliding groove A in the supporting rod, and the rack B slides in the sliding groove B in the supporting rod.

4. The hoisting apparatus of claim 1, wherein: the tail end of the support sleeve is provided with a base, and a fixed sleeve in each universal wheel mechanism is fixedly arranged on the base; the rotating shaft is provided with a circular ring B which rotates in a circular groove on the inner wall of the corresponding fixed sleeve; two guide blocks B are symmetrically arranged on the sliding block B and respectively slide in two guide grooves B on the inner wall of the rectangular frame; two fixed shafts are symmetrically arranged on two sides of the sliding block B, and two rollers in each universal wheel mechanism are symmetrically arranged on the two fixed shafts.

5. The hoisting apparatus of claim 1, wherein: the supporting rod is symmetrically provided with two guide blocks A which slide in two guide grooves A on the inner wall of the supporting sleeve respectively; the fixed rod is provided with an L-shaped swing limiting rod matched with the supporting rod; a rotary seat which is rotationally matched with the screw rod is fixedly arranged in the supporting sleeve, and a circular ring A arranged on the screw rod rotates in a circular groove on the inner wall of the rotary seat.

6. The hoisting apparatus of claim 1, wherein: the spring A is an extension spring; one end of the spring A is connected with a fixed block arranged on the supporting rod, and the other end of the spring A is connected with the sliding block A; the spring a is always in tension.