Tower crane with double-loop jacking system

Abstract

The invention discloses a tower crane with a double-loop jacking system, and particularly relates to the technical field of tower cranes, the tower crane comprises a tower body, the tower body is composed of a plurality of vertically stacked standard knots, a jacking sleeve frame is erected on the outer side of the tower body, a jacking assembly is arranged on the jacking sleeve frame, a rotating device is arranged above the jacking sleeve frame, and the rotating device is connected with the jacking assembly. And a hoisting device is arranged on the rotating device. Through the arrangement of the protection assembly, when a hydraulic system breaks down in the lifting working process of the hydraulic cylinder, on one hand, hydraulic oil in a piston barrel can prevent the piston rods from retracting, and the two piston rods can continue to support the jacking cross beam, so that the stability of the tower crane structure is ensured, and serious safety accidents caused by faults of the hydraulic cylinder are avoided; on the other hand, the two piston rods can stretch out or retract by injecting hydraulic oil into the two piston cylinders or extracting the hydraulic oil from the two piston cylinders, the temporary jacking effect can be achieved, long-time shutdown during maintenance is avoided, and the operation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tower cranes, and more particularly to a tower crane with a double-circuit lifting system. Background Art

[0002] Tower cranes, also known as tower cranes, originated in Western Europe and are mainly used for vertical and horizontal transportation of materials and installation of building components in housing construction. Tower cranes are composed of metal frames, which are the so-called standard sections. They are fixed together by bolts and eventually form the body of the entire tower crane. The jacking system of a tower crane usually uses hydraulic cylinders to raise the tower body. The hydraulic pump station provides high-pressure oil to extend the piston rod, thereby pushing the jacking frame up to lift or lower the upper structure of the tower crane. However, the hydraulic cylinder is prone to damage during long-term use and the hydraulic system fails, which may cause the jacking frame to fail to reach the specified height for self-locking during the jacking process, and easily cause the tower crane to fall during the jacking process.

[0003] The Chinese patent application number CN202410703371.X specifically discloses an assembled building tower crane lifting device with an anti-fall structure and a safety control method, including a first self-locking mechanism arranged on the top of the inner side of the lifting sleeve for self-locking after the lifting sleeve is lifted to a specified height. The invention facilitates the rotation of the first abutment plate, the second abutment plate and the convex plate through the first self-locking mechanism, so that the lifting sleeve is self-locked after it is lifted to a specified height, thereby improving the stability of the lifting sleeve, and by arranging a second self-locking mechanism on the outer side of the second abutment plate, it is convenient to self-lock the lifting sleeve during the lifting process, further improving the stability of the lifting and preventing it from falling. The self-locking is performed in a purely mechanical manner, with high stability, and the auxiliary component is used to self-lock the lifting sleeve during the exchange operation of the first self-locking mechanism and the second self-locking mechanism, thereby improving the anti-fall effect.

[0004] Although the above invention can achieve self-locking through the self-locking mechanism and improve the anti-fall effect, the self-locking mechanism of the above invention has a relatively complex structure, and a tooth plate needs to be installed on each standard section for cooperation, which will greatly increase the production cost, and when the hydraulic cylinder is damaged, the machine can only be shut down for maintenance, affecting the installation efficiency. At the same time, the above invention cannot determine whether the jacking sleeve has reached the specified height during the jacking process. When the jacking sleeve has not reached the fulcrum height, manual misoperation may cause mutual influence between the hydraulic cylinder and the self-locking mechanism, resulting in damage to the hydraulic cylinder and the self-locking mechanism, and the safety of the construction workers cannot be guaranteed.

[0005] The present invention provides a tower crane with a dual-circuit jacking system, aiming to solve the problems in the prior art that the self-locking mechanism of the tower crane is relatively complex in structure, the production cost is greatly increased, and when the hydraulic cylinder is damaged, the machine can only be shut down for maintenance, which affects the installation efficiency, and it is impossible to judge whether the jacking sleeve has reached the specified height during the jacking process, and the safety of the construction personnel cannot be guaranteed in the event of misoperation. Summary of the invention

[0006] The object of the present invention is to provide a tower crane with a dual-circuit jacking system to solve the problems in the prior art proposed in the above-mentioned background technology, that is, the self-locking mechanism structure of the tower crane is relatively complex, the production cost is greatly increased, and it is impossible to judge whether the jacking frame has reached the specified height during the jacking process, and the safety of the construction personnel cannot be guaranteed in the event of misoperation.

[0007] To achieve the above object, the present invention provides the following technical solution: a tower crane with a double-circuit jacking system, comprising a tower body, the tower body consisting of a plurality of vertically stacked standard sections, a jacking frame is erected on the outer side of the tower body, a jacking assembly is arranged on the jacking frame, a slewing device is arranged above the jacking frame, a lifting device is arranged on the slewing device, and further comprising: A protection component, the protection component is arranged on the jacking component and is used to support the jacking component when a jacking operation of the jacking component fails; An early warning component is arranged on the protection component and is used to alarm for erroneous operation when the lifting height of the lifting component does not meet the operation requirements.

[0008] Preferably, the jacking assembly comprises a supporting crossbeam fixed on the jacking sleeve frame, a hydraulic cylinder is hingedly connected to the inner center position of the supporting crossbeam, and the output end of the hydraulic cylinder is hingedly connected to the jacking crossbeam; The protection component includes two piston cylinders hinged on the inner side of the supporting beam, the two piston cylinders are symmetrically arranged on both sides of the hydraulic cylinder, the interiors of the two piston cylinders are sealed and slidably connected with pistons, the sides of the two pistons away from the supporting beam are fixedly connected with piston rods, and the other ends of the two piston rods are hinged to the lifting beam.

[0009] Preferably, an oil storage tank is fixedly connected to the supporting crossbeam, an extrusion plate is sealingly and slidably connected inside the oil storage tank, a first elastic member is connected between the top of the extrusion plate and the inner wall of the oil storage tank, the interior of the oil storage tank is filled with hydraulic oil on the side of the extrusion plate away from the first elastic member, oil outlet holes are provided on both sides of the oil storage tank, and oil inlet holes are provided on the two piston cylinders, and the two oil outlet holes are connected to the corresponding oil inlet holes through oil pipes.

[0010] Preferably, the two side walls of the oil storage tank corresponding to the positions of the two oil outlet holes are provided with switching grooves, the two switching grooves are fixedly connected with switching plates, the two switching plates are provided with a first oil outlet groove and a second oil outlet groove, and the two first oil outlet grooves are provided with a one-way valve; When the two piston rods are fully extended, the two pistons can pump all the hydraulic oil in the oil storage tank into the corresponding piston cylinders.

[0011] Preferably, the oil storage tank is provided with driving grooves the same in number and corresponding in position to the switching grooves, both ends of the extrusion plate are fixedly connected with first magnetic parts which are slidably connected in the corresponding driving grooves, and the two switching plates are fixedly embedded with second magnetic parts and third magnetic parts which can correspond to the positions of the first magnetic parts.

[0012] Preferably, when the extrusion plate compresses the first elastic member to move to the extreme position, the positions of the two first magnetic members correspond to the positions of the two second magnetic members, and the two first magnetic members can push the two switching plates to move by repelling the same polarity of the magnetic poles of the two second magnetic members, so that the positions of the two first oil outlet grooves correspond to the positions of the two oil outlet holes; When the first elastic member is completely released and pushes the extrusion plate to move to the extreme position, the positions of the two first magnetic members correspond to those of the two third magnetic members, and the two first magnetic members can drive the two switching plates to move by the oppositely-polarized attraction with the magnetic poles of the two third magnetic members, so that the positions of the two second oil outlet grooves correspond to those of the two oil outlet holes.

[0013] Preferably, the early warning component includes two telescopic parts, and the ends of the two piston rods extending out of the corresponding piston cylinders are provided with telescopic grooves, and the two telescopic parts are respectively slidably connected in the two telescopic grooves. A second elastic part is connected between the ends of the two telescopic parts located inside the corresponding telescopic grooves and the corresponding telescopic grooves, and the ends of the two telescopic parts away from the corresponding second elastic parts are hinged to the lifting beam, and the elastic coefficients of the two second elastic parts are greater than the elastic coefficient of the first elastic part.

[0014] Preferably, the ends of the two telescopic members located inside the corresponding telescopic slots are both provided with a first conductive member, the insides of the two telescopic slots are both provided with a second conductive member, and the jacking sleeve is provided with an alarm; When the two telescopic members completely compress the corresponding second elastic member, the two first conductive members can contact the corresponding second conductive members to achieve electrical conduction, and the alarm can sound an alarm.

[0015] Preferably, each of the standard sections is fixedly connected to two limit members on the same side as the jacking assembly along the length direction, the jacking beam can be clamped in the two limit members, and the inner side of the jacking sleeve is rotatably connected to two positioning members, and the two positioning members correspond to the positions of the two limit members respectively.

[0016] Preferably, when the lifting beam is clamped inside the two limit members, the extension of the hydraulic cylinder can drive the lifting sleeve to move along the length direction of the tower body; When the hydraulic cylinder drives the lifting sleeve to move so that the output end is fully extended, the two positioning members are located above the two limiting members. After the hydraulic cylinder retracts, the two positioning members can be engaged with the two limiting members to limit the lifting sleeve, and the lifting sleeve cannot move downward.

[0017] Technical effects and advantages of the present invention: 1. The present invention provides a protection component. When a hydraulic system fails during the lifting process of the hydraulic cylinder, on the one hand, the hydraulic oil in the piston cylinder can prevent the piston rod from retracting, and the two piston rods can continue to support the jacking beam, thereby preventing the jacking sleeve from falling, thereby protecting the lifting work of the tower crane, thereby ensuring the stability of the tower crane structure and avoiding serious safety accidents caused by hydraulic cylinder failure. On the other hand, by injecting hydraulic oil into or extracting hydraulic oil from the two piston cylinders, the two piston rods can be extended or retracted, which can play a temporary lifting role, and the lifting work of the tower crane can continue to be completed, thereby avoiding long-term maintenance shutdowns and improving work efficiency.

[0018] 2. The present invention provides an early warning component. When a fault occurs in the hydraulic cylinder and the output end is not fully extended or the hydraulic cylinder is not fully lifted into place and is retracted due to erroneous operation, the telescopic member will gradually compress the second elastic member to slide in the telescopic groove, and the first conductive member will be in contact with the second conductive member to achieve electrical conduction, so that the alarm will sound an alarm to remind the staff, thereby protecting the protection component and the hydraulic cylinder to avoid damage to the piston barrel, piston and piston rod. The alarm can also be used to determine whether the lifting work is in place. On the one hand, it can avoid the instability or overturning of the tower crane due to improper operation, effectively prevent the occurrence of accidents, and further ensure the safety of construction personnel. On the other hand, it can avoid invalid operations or repeated operations due to the hydraulic cylinder not being in place, thereby improving the overall construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the jacking frame of the present invention; Figure 3This is a schematic diagram of the position of the protection component of the present invention; Figure 4 For the present invention Figure 3 A magnified view of the structure of part A; Figure 5 This is a schematic diagram of the structure of the protection component of the present invention; Figure 6 It is a partial structural cross-sectional view of the piston cylinder of the present invention; Figure 7 This is a cross-sectional view of the internal structure of the piston cylinder of the present invention; Figure 8 For the present invention Figure 7 A magnified view of the structure of part B; Fig. 9 This is a cross-sectional view of the internal structure of the switching slot of the present invention; Fig.10 This is a cross-sectional view of the internal structure of the oil storage tank of the present invention; Fig.11 This is a cross-sectional view of the oil outlet structure of the present invention; Fig.12 This is a schematic diagram of the structure of the switching board of the present invention.

[0020] The accompanying drawings are marked as follows: 1, tower body; 11, standard section; 111, limiter; 12, slewing device; 13, lifting device; 2, lifting frame; 21, lifting assembly; 211, supporting beam; 212, hydraulic cylinder; 213, lifting beam; 214, positioning member; 3, protection assembly; 31, piston cylinder; 32, piston; 33, piston rod; 34, oil storage tank; 35, extrusion plate; 36, first elastic member; 37, oil outlet hole; 3 8. Oil inlet hole; 39. Oil pipe; 310. Switching slot; 311. Switching plate; 312. First oil outlet slot; 313. Second oil outlet slot; 314. One-way valve; 315. Drive slot; 316. First magnetic member; 317. Second magnetic member; 318. Third magnetic member; 4. Early warning component; 41. Telescopic member; 42. Telescopic slot; 43. Second elastic member; 44. First conductive member; 45. Second conductive member; 46. Alarm. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1

[0022] The self-locking mechanism structure of the tower crane in the prior art is relatively complex, which greatly increases the production cost, and when the hydraulic cylinder is damaged, the machine can only be shut down for maintenance, which affects the installation efficiency.

[0023] refer to Figure 1-Figure 12 A tower crane with a dual-circuit jacking system according to an embodiment of the present invention comprises a tower body 1, the tower body 1 is composed of a plurality of vertically stacked standard sections 11, a jacking frame 2 is arranged on the outer side of the tower body 1, a jacking assembly 21 is arranged on the jacking frame 2, a slewing device 12 is arranged above the jacking frame 2, and a lifting device 13 is arranged on the slewing device 12.

[0024] refer to Figure 3-Figure 5 The jacking assembly 21 includes a supporting beam 211 fixed on the jacking sleeve 2, a hydraulic cylinder 212 is hinged at the inner center position of the supporting beam 211, and a jacking beam 213 is hinged at the output end of the hydraulic cylinder 212. Each standard section 11 is fixedly connected to two limit members 111 on the same side as the jacking assembly 21 along the length direction, and the jacking beam 213 can be clamped in the two limit members 111. The inner side of the jacking sleeve 2 is rotatably connected to two positioning members 214, and the two positioning members 214 correspond to the positions of the two limit members 111 respectively.

[0025] When the lifting beam 213 is clamped inside the two limit members 111 , the hydraulic cylinder 212 is extended to drive the lifting sleeve 2 to move along the length direction of the tower body 1 .

[0026] When the hydraulic cylinder 212 drives the lifting sleeve 2 to move so that the output end is fully extended, the two positioning members 214 are located above the two limiting members 111. After the hydraulic cylinder 212 retracts, the two positioning members 214 can be engaged with the two limiting members 111 to limit the lifting sleeve 2, and the lifting sleeve 2 cannot move downward.

[0027] When the tower crane needs to be raised, a standard section 11 is hoisted onto the jacking frame 2 through the lifting device 13, and then a standard section 11 is lifted for counterweight to prevent imbalance during the jacking process, and then the jacking crossbeam 213 on the hydraulic cylinder 212 in the retracted state is clamped on the two limit members 111. After the clamping is completed, the hydraulic cylinder 212 is started to extend the output end of the hydraulic cylinder 212, thereby driving the jacking frame 2, the rotating device 12 and the lifting device 13 to move upward along the length direction of the tower body 1. When the output end of the hydraulic cylinder 212 is fully extended, the two positioning members 214 are located above the two limit members 111. At this time, the output end of the hydraulic cylinder 212 can be retracted, and the two positioning members 214 can be clamped with the two limit members 111, so that the jacking frame 2 can be limited, and the jacking frame 2 cannot move downward. At this time, the standard section 11 can be installed, and the tower crane can be raised by repeating this process. The tower crane section lifting is a prior art and will not be described in detail here.

[0028] refer to Figure 3-Figure 12 , and also includes a protection component 3, which is arranged on the jacking component 21 and is used to support the jacking component 21 when a jacking operation of the jacking component 21 fails. The protection component 3 includes two piston cylinders 31 hinged on the inner side of the supporting crossbeam 211, and the two piston cylinders 31 are symmetrically arranged on both sides of the hydraulic cylinder 212. The interiors of the two piston cylinders 31 are both sealed and slidably connected with pistons 32. The two pistons 32 are fixedly connected to the piston rods 33 on the sides away from the supporting crossbeam 211. The other ends of the two piston rods 33 are connected to the jacking component 211. The lifting beam 213 is hinged, and an oil storage tank 34 is fixedly connected to the supporting beam 211. The interior of the oil storage tank 34 is sealed and slidably connected with an extrusion plate 35. A first elastic member 36 is connected between the top of the extrusion plate 35 and the inner wall of the oil storage tank 34. The interior of the oil storage tank 34 is filled with hydraulic oil on the side of the extrusion plate 35 away from the first elastic member 36. Oil outlet holes 37 are provided on both sides of the oil storage tank 34, and oil inlet holes 38 are provided on the two piston cylinders 31. The two oil outlet holes 37 are connected to the corresponding oil inlet holes 38 through oil pipes 39.

[0029] Switching grooves 310 are provided inside the two side walls of the oil storage tank 34 corresponding to the positions of the two oil outlet holes 37, and switching plates 311 are fixedly connected inside the two switching grooves 310. The two switching plates 311 are provided with a first oil outlet groove 312 and a second oil outlet groove 313, and a one-way valve 314 is provided in the two first oil outlet grooves 312. The oil storage tank 34 is provided with driving grooves 315 with the same number and corresponding positions as the switching grooves 310, and both ends of the extrusion plate 35 are fixedly connected with first magnetic parts 316 slidably connected in the corresponding driving grooves 315, and the two switching plates 311 are fixedly embedded with second magnetic parts 317 and third magnetic parts 318 that can correspond to the positions of the corresponding first magnetic parts 316.

[0030] When the two piston rods 33 are fully extended, the two pistons 32 can pump all the hydraulic oil in the oil storage tank 34 into the corresponding piston cylinders 31 .

[0031] refer to Figure 9-11 When the extrusion plate 35 compresses the first elastic member 36 and moves it to the extreme position, the positions of the two first magnetic members 316 and the two second magnetic members 317 correspond. The two first magnetic members 316 can push the two switching plates 311 to move by repelling the same poles of the two second magnetic members 317, so that the positions of the two first oil outlet grooves 312 and the two oil outlet holes 37 correspond.

[0032] When the first elastic member 36 is fully released to push the extrusion plate 35 to move to the extreme position, the positions of the two first magnetic members 316 and the two third magnetic members 318 correspond. The two first magnetic members 316 can drive the two switching plates 311 to move by the opposite attraction with the magnetic poles of the two third magnetic members 318, so that the positions of the two second oil outlet grooves 313 and the two oil outlet holes 37 correspond.

[0033] In actual use, during the process of extending the output end of the hydraulic cylinder 212 to perform the lifting work, the hydraulic cylinder 212 will drive the two piston rods 33 to extend from the piston cylinder 31 through the jacking crossbeam 213. During the extension process, the two piston rods 33 will drive the two pistons 32 to move in the corresponding piston cylinders 31. Since the hydraulic oil in the oil storage tank 34 cannot enter the piston cylinder 31 when the piston rods 33 are in the retracted state, the hydraulic oil in the oil storage tank 34 will push the extrusion plate 35 to the extreme position at the top of the oil storage tank 34, so that the first elastic member 36 is in a compressed state. The positions of the two first magnetic parts 316 correspond to those of the two second magnetic parts 317. The two first magnetic parts 316 can push the two switching plates 311 to move by the like-pole repulsion with the two second magnetic parts 317, so that the two first oil outlet grooves 312 can correspond to the positions of the two oil outlet holes 37. Therefore, when the two piston rods 33 extend to drive the two pistons 32 to move in the corresponding piston cylinders 31, the hydraulic oil in the oil storage tank 34 will be pumped into the piston cylinder 31 through the oil inlet hole 38, the oil pipe 39, the oil outlet hole 37, the first oil outlet groove 312 and the one-way valve 314.

[0034] When the hydraulic system fails during the lifting process of the hydraulic cylinder 212, since the two first oil outlet grooves 312 are provided with a one-way valve 314, the hydraulic oil in the two piston cylinders 31 cannot flow back. At this time, the hydraulic oil in the piston cylinders 31 can prevent the piston rod 33 from retracting. The two piston rods 33 can continue to support the lifting beam 213 and prevent the lifting frame 2 from falling, thereby protecting the lifting work of the tower crane and ensuring the safety of the construction workers.

[0035] When the output end of the hydraulic cylinder 212 is fully extended to complete the current jacking operation, the two piston rods 33 will be fully extended synchronously. During the process of the two piston rods 33 being fully extended, the hydraulic oil in the oil storage tank 34 will be completely pumped into the corresponding piston cylinder 31 through the two pistons 32. The first elastic member 36 will be fully released to push the extrusion plate 35 to move to the extreme position. At this time, the positions of the two first magnetic members 316 and the two third magnetic members 318 correspond to each other. The two first magnetic members 316 can drive the two switching plates 311 to move by the opposite attraction with the magnetic poles of the two third magnetic members 318, so that the two second oil outlet grooves 313 correspond to the positions of the two oil outlet holes 37. At this time, the contraction of the hydraulic cylinder 212 can drive the two piston rods 33 and the two pistons 32 to move in the corresponding piston cylinder 31, and squeeze the hydraulic oil in the two piston cylinders 31 into the oil storage tank 34 again through the oil inlet hole 38, the oil pipe 39, the oil outlet hole 37 and the second oil outlet groove 313, so as not to affect the normal operation of the hydraulic cylinder 212.

[0036] When the hydraulic cylinder 212 fails or is damaged, the two piston rods 33 can be extended or retracted by injecting hydraulic oil into or extracting hydraulic oil from the two piston tubes 31, which can play a temporary lifting role and continue to complete the lifting work of the tower crane, avoiding long-term maintenance shutdown and improving work efficiency.

[0037] The two piston rods 33 extend and retract synchronously with the hydraulic cylinder 212 , thereby preventing the force applied to the lifting beam 213 from being offset, and playing a stabilizing role during the operation of the hydraulic cylinder 212 .

[0038] To sum up, through the setting of the protection component 3, when the hydraulic system fails during the lifting work of the hydraulic cylinder 212, on the one hand, the hydraulic oil in the piston cylinder 31 can prevent the piston rod 33 from retracting, and the two piston rods 33 can continue to support the jacking beam 213, which can prevent the jacking sleeve 2 from falling, and play a protective role in the lifting work of the tower crane, thereby ensuring the stability of the tower crane structure and avoiding serious safety accidents caused by the failure of the hydraulic cylinder 212. On the other hand, by injecting hydraulic oil into or extracting hydraulic oil from the two piston cylinders 31, the two piston rods 33 can be extended or retracted, which can play a temporary lifting role, and the lifting work of the tower crane can continue to be completed, avoiding long-term maintenance shutdowns and improving work efficiency. Embodiment 2

[0039] During actual use, when the hydraulic cylinder malfunctions and is damaged, the hydraulic cylinder may not be able to fully extend and reach the specified height. When manual operation is performed before the jacking frame reaches the specified height, the hydraulic cylinder and the protective component may affect each other, causing damage to the hydraulic cylinder and the protective component, and failing to ensure the safety of the construction workers. Therefore, this embodiment improves the device described in the above embodiment.

[0040] refer to Figure 5-Figure 7 , and also includes an early warning component 4, which is arranged on the protection component 3, and is used to alarm for incorrect operation when the jacking height of the jacking component 21 does not meet the operation requirements. The early warning component 4 includes two telescopic parts 41, and one end of the two piston rods 33 extending out of the corresponding piston cylinder 31 is provided with a telescopic groove 42, and the two telescopic parts 41 are respectively slidably connected in the two telescopic grooves 42, and a second elastic part 43 is connected between one end of the two telescopic parts 41 located inside the corresponding telescopic groove 42 and the corresponding telescopic groove 42, and the ends of the two telescopic parts 41 away from the corresponding second elastic parts 43 are hinged to the jacking beam 213, and the elastic coefficients of the two second elastic parts 43 are greater than the elastic coefficient of the first elastic part 36.

[0041] refer to Figure 8 A first conductive member 44 is provided at one end of the two telescopic members 41 located inside the corresponding telescopic groove 42, and a second conductive member 45 is provided inside the two telescopic grooves 42. An alarm 46 is provided on the jacking sleeve 2. When the two telescopic members 41 completely compress the corresponding second elastic member 43, the two first conductive members 44 can contact the corresponding second conductive member 45 to achieve electrical conduction, which can cause the alarm 46 to sound an alarm.

[0042] During actual use, when the output end of the hydraulic cylinder 212 is extended to perform the lifting operation, the hydraulic cylinder 212 will drive the two piston rods 33 to extend out of the piston tube 31 through the lifting beam 213 and the telescopic member 41. During this process, the telescopic member 41 will not compress the second elastic member 43, and the first conductive member 44 and the second conductive member 45 cannot contact each other.

[0043] When the output end of the hydraulic cylinder 212 is fully extended to complete the current jacking operation, and during the process of retracting again, since the elastic coefficients of the two second elastic parts 43 are greater than the elastic coefficient of the first elastic part 36, the hydraulic cylinder 212 contracts and drives the jacking beam 213 to move. When the two telescopic parts 41 drive the two piston rods 33 and the two pistons 32 to squeeze the hydraulic oil in the corresponding piston cylinder 31 into the oil storage tank 34, the second elastic part 43 will not be completely compressed, and the first conductive part 44 and the second conductive part 45 cannot contact each other. Therefore, when the hydraulic cylinder 212 is working normally, the first conductive part 44 and the second conductive part 45 cannot contact each other, and the alarm 46 will not sound an alarm, thereby not affecting the normal operation of the hydraulic cylinder 212.

[0044] When a malfunction occurs in the hydraulic cylinder 212, resulting in the output end not being fully extended, or when the hydraulic cylinder 212 is not fully lifted into place and is retracted due to an erroneous operation, the hydraulic oil in the two piston cylinders 31 cannot flow back. At this time, the hydraulic oil in the piston cylinder 31 will prevent the piston rod 33 from retracting. Therefore, when the staff erroneously operates and retracts the hydraulic cylinder 212, the telescopic member 41 will gradually compress the second elastic member 43 to slide in the telescopic groove 42, causing the first conductive member 44 to contact the second conductive member 45 to achieve electrical conduction, causing the alarm 46 to sound an alarm to remind the staff, thereby protecting the protection component 3 and the hydraulic cylinder 212 to avoid damage to the piston cylinder 31, the piston 32 and the piston rod 33. The alarm 46 can also be used to determine whether the lifting work is in place, thereby avoiding instability or overturning of the tower crane due to improper operation, effectively preventing accidents, and further ensuring the safety of construction personnel.

[0045] To sum up, through the setting of the early warning component 4, when the hydraulic cylinder 212 fails and the output end is not fully extended or the hydraulic cylinder 212 is not fully lifted into place and is retracted due to erroneous operation, the telescopic member 41 will gradually compress the second elastic member 43 to slide in the telescopic groove 42, and the first conductive member 44 will contact the second conductive member 45 to achieve electrical conduction, so that the alarm 46 will sound an alarm to remind the staff, thereby protecting the protection component 3 and the hydraulic cylinder 212 to avoid damage to the piston cylinder 31, the piston 32 and the piston rod 33. The alarm 46 can also be used to determine whether the lifting work is in place. On the one hand, it can avoid the instability or overturning of the tower crane due to improper operation, effectively prevent the occurrence of accidents, and further ensure the safety of construction personnel. On the other hand, it can avoid invalid operations or repeated operations caused by the hydraulic cylinder 212 not being in place, thereby improving the overall construction efficiency.

[0046] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tower crane with a double-circuit jacking system, comprising a tower body (1), the tower body (1) being composed of a plurality of vertically stacked standard sections (11), a jacking frame (2) being arranged on the outer side of the tower body (1), a jacking assembly (21) being arranged on the jacking frame (2), a slewing device (12) being arranged above the jacking frame (2), a lifting device (13) being arranged on the slewing device (12), and characterized in that: Also includes: A protection component (3), the protection component (3) being arranged on the jacking component (21) and being used to support the jacking component (21) when a jacking operation of the jacking component (21) fails; An early warning component (4) is arranged on the protection component (3) and is used to alarm for erroneous operation when the lifting height of the lifting component (21) does not meet the operation requirements.

2. The tower crane with a dual-circuit jacking system according to claim 1, characterized in that: The jacking assembly (21) comprises a supporting crossbeam (211) fixed on the jacking sleeve (2), a hydraulic cylinder (212) being hingedly connected at the inner center position of the supporting crossbeam (211), and a jacking crossbeam (213) being hingedly connected at the output end of the hydraulic cylinder (212); The protection component (3) comprises two piston cylinders (31) hinged to the inner side of the supporting cross beam (211), the two piston cylinders (31) are symmetrically arranged on both sides of the hydraulic cylinder (212), the interiors of the two piston cylinders (31) are sealed and slidably connected to pistons (32), the sides of the two pistons (32) away from the supporting cross beam (211) are fixedly connected to piston rods (33), and the other ends of the two piston rods (33) are hinged to the lifting cross beam (213).

3. The tower crane with a dual-circuit jacking system according to claim 2, characterized in that: An oil storage tank (34) is fixedly connected to the supporting cross beam (211), and an extrusion plate (35) is sealingly and slidably connected inside the oil storage tank (34). A first elastic member (36) is connected between the top of the extrusion plate (35) and the inner wall of the oil storage tank (34). The inside of the oil storage tank (34) is filled with hydraulic oil on a side of the extrusion plate (35) away from the first elastic member (36). Oil outlet holes (37) are provided on both sides of the oil storage tank (34), and oil inlet holes (38) are provided on the two piston cylinders (31). The two oil outlet holes (37) are connected to the corresponding oil inlet holes (38) through oil pipes (39).

4. The tower crane with a dual-circuit jacking system according to claim 3, characterized in that: Switching grooves (310) are provided inside two side walls of the oil storage tank (34) corresponding to the positions of the two oil outlet holes (37); a switching plate (311) is fixedly connected inside the two switching grooves (310); a first oil outlet groove (312) and a second oil outlet groove (313) are provided on the two switching plates (311); and a one-way valve (314) is provided inside the two first oil outlet grooves (312); When the two piston rods (33) are fully extended, the two pistons (32) can pump all the hydraulic oil in the oil storage tank (34) into the corresponding piston cylinder (31).

5. The tower crane with a dual-circuit jacking system according to claim 4, characterized in that: The oil storage tank (34) is provided with drive slots (315) in the same number as the switch slots (310) and in corresponding positions, and both ends of the extrusion plate (35) are fixedly connected with first magnetic members (316) slidably connected in the corresponding drive slots (315), and the two switch plates (311) are fixedly embedded with second magnetic members (317) and third magnetic members (318) that can correspond to the positions of the first magnetic members (316).

6. The tower crane with a dual-circuit jacking system according to claim 5, characterized in that: When the extrusion plate (35) compresses the first elastic member (36) to move to the extreme position, the positions of the two first magnetic members (316) and the two second magnetic members (317) correspond to each other, and the two first magnetic members (316) can push the two switching plates (311) to move by repelling the same polarity of the magnetic poles of the two second magnetic members (317), so that the positions of the two first oil outlet grooves (312) and the two oil outlet holes (37) correspond to each other; When the first elastic member (36) is completely released to push the extrusion plate (35) to move to the extreme position, the positions of the two first magnetic members (316) and the two third magnetic members (318) correspond, and the two first magnetic members (316) can drive the two switching plates (311) to move by attracting opposite poles of the two third magnetic members (318), so that the positions of the two second oil outlet grooves (313) and the two oil outlet holes (37) correspond.

7. The tower crane with a dual-circuit jacking system according to claim 6, characterized in that: The warning component (4) comprises two telescopic parts (41), and one end of each of the two piston rods (33) extending out of the corresponding piston cylinder (31) is provided with a telescopic groove (42). The two telescopic parts (41) are respectively slidably connected in the two telescopic grooves (42). A second elastic part (43) is connected between one end of each of the two telescopic parts (41) located inside the corresponding telescopic groove (42) and the corresponding telescopic groove (42). One end of each of the two telescopic parts (41) away from the corresponding second elastic part (43) is hinged to the lifting beam (213), and the elastic coefficients of the two second elastic parts (43) are greater than the elastic coefficient of the first elastic part (36).

8. The tower crane with a dual-circuit jacking system according to claim 7, characterized in that: A first conductive member (44) is provided at one end of the two telescopic members (41) located inside the corresponding telescopic slots (42), a second conductive member (45) is provided inside the two telescopic slots (42), and an alarm (46) is provided on the lifting sleeve (2); When the two telescopic members (41) completely compress the corresponding second elastic member (43), the two first conductive members (44) can contact the corresponding second conductive member (45) to achieve electrical conduction, thereby enabling the alarm device (46) to sound an alarm.

9. The tower crane with a dual-circuit jacking system according to claim 8, characterized in that: Each of the standard sections (11) is fixedly connected to two limit members (111) on the same side as the lifting assembly (21) along the length direction; the lifting crossbeam (213) can be snapped into the two limit members (111); the inner side of the lifting sleeve (2) is rotatably connected to two positioning members (214); the two positioning members (214) correspond to the positions of the two limit members (111) respectively.

10. The tower crane with a dual-circuit jacking system according to claim 9, characterized in that: When the lifting crossbeam (213) is clamped inside the two stoppers (111), the hydraulic cylinder (212) is extended to drive the lifting sleeve (2) to move along the length direction of the tower body (1); When the hydraulic cylinder (212) drives the lifting sleeve (2) to move so that the output end is fully extended, the two positioning members (214) are located above the two limiting members (111); after the hydraulic cylinder (212) is retracted, the two positioning members (214) can be engaged with the two limiting members (111), thereby limiting the lifting sleeve (2) and preventing the lifting sleeve (2) from moving downward.

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