Tower crane with dual-circuit jacking system

Abstract

The present invention discloses a tower crane with a dual-circuit jacking system, specifically relating to the technical field of tower cranes, comprising a tower body, the tower body being composed of a plurality of vertically stacked standard sections, a jacking sleeve being mounted on the outer side of the tower body, a jacking assembly being arranged on the jacking sleeve, a slewing device being arranged above the jacking sleeve, and a lifting device being arranged on the slewing device. The present invention provides a protection assembly, so that when a hydraulic system fails during the section lifting operation 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 ensuring the stability of the tower crane structure and avoiding serious safety accidents caused by hydraulic cylinder failure. On the other hand, by injecting or extracting hydraulic oil into the two piston cylinders, the two piston rods can be extended or retracted, which can play a role of temporary jacking, avoiding long-term maintenance shutdowns and improving operating efficiency.

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 jacking system. Background Art

[0002] Tower cranes, also known as tower cranes, originated in Western Europe and are primarily used for vertical and horizontal material transportation and the installation of building components during housing construction. A tower crane is composed of a series of metal frames, known as standard sections, bolted together to form the entire crane. The tower crane's jacking system typically uses hydraulic cylinders to raise the tower. The hydraulic pump station provides high-pressure oil, extending the piston rod, which in turn pushes the jacking frame upward, raising or lowering the tower crane's superstructure. However, hydraulic cylinders are prone to damage over long periods of use, and malfunctions in the hydraulic system can prevent the jacking frame from reaching the designated height and self-locking during the lifting process, potentially causing the tower crane to fall.

[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 at the top inner side of the jacking sleeve for self-locking after the jacking 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 jacking sleeve is self-locked after it is lifted to the specified height, thereby improving the stability of the jacking 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 jacking sleeve during the jacking process, further improving the jacking stability and preventing it from falling. The self-locking is performed in a purely mechanical manner, with high stability, and the jacking sleeve is self-locked by the auxiliary component 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 is manually operated before it reaches the fulcrum height, it may cause the hydraulic cylinder and the self-locking mechanism to affect each other, 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 of tower cranes, such as the relatively complex structure of the self-locking mechanism, which greatly increases the production cost, the need to shut down for repairs when the hydraulic cylinder is damaged, which affects the installation efficiency, and the inability to determine whether the jacking frame has reached the specified height during the jacking process, resulting in a failure to ensure the safety of construction workers 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, such as the relatively complex structure of the self-locking mechanism of the tower crane, which greatly increases the production cost, and the inability to determine whether the jacking frame has reached the specified height during the jacking process, resulting in the inability to ensure the safety of construction workers in the event of misoperation.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a tower crane with a dual-circuit jacking system, comprising a tower body, the tower body being composed of a plurality of vertically stacked standard sections, a jacking frame being provided on the outer side of the tower body, a jacking assembly being provided on the jacking frame, a slewing device being provided above the jacking frame, a lifting device being provided on the slewing device, and further comprising:

[0008] A protection assembly, the protection assembly being arranged on the jacking assembly and being used to support the jacking assembly when a jacking operation of the jacking assembly fails;

[0009] An early warning component is provided 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.

[0010] Preferably, the jacking assembly includes a supporting beam fixed on the jacking sleeve frame, a hydraulic cylinder is hinged at the inner center position of the supporting beam, and the output end of the hydraulic cylinder is hinged to the jacking beam;

[0011] The protection component includes two piston cylinders hinged on the inner side of the supporting beam, and 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, and the two pistons are fixedly connected to piston rods on the side away from the supporting beam. The other ends of the two piston rods are hinged to the lifting beam.

[0012] 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.

[0013] Preferably, a switching groove is provided inside the two side walls of the oil storage tank corresponding to the positions of the two oil outlet holes, a switching plate is fixedly connected to the two switching grooves, a first oil outlet groove and a second oil outlet groove are provided on the two switching plates, and a one-way valve is provided in the two first oil outlet grooves;

[0014] 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.

[0015] Preferably, the interior of the oil storage tank is provided with driving grooves of the same number and corresponding positions as the switching grooves, both ends of the extrusion plate are fixedly connected with first magnetic parts that are slidably connected to the corresponding driving grooves, and the two switching plates are fixedly embedded with second magnetic parts and third magnetic parts that can correspond to the positions of the corresponding first magnetic parts.

[0016] Preferably, when the extrusion plate compresses the first elastic member and moves it to the extreme position, the positions of the two first magnetic members correspond to the positions of the two second magnetic members. The two first magnetic members can push the two switching plates to move by repelling the same-pole 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.

[0017] 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. The two first magnetic members can drive the two switching plates to move by attracting the opposite 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.

[0018] 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. 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. 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.

[0019] Preferably, the ends of the two telescopic members located inside the corresponding telescopic slots are each provided with a first conductive member, the interiors of the two telescopic slots are each provided with a second conductive member, and the jacking sleeve is provided with an alarm;

[0020] When the two telescopic members completely compress the corresponding second elastic members, the two first conductive members can contact the corresponding second conductive members to achieve electrical conduction, which can cause the alarm to sound an alarm.

[0021] 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.

[0022] 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;

[0023] 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, thereby limiting the lifting sleeve and preventing the lifting sleeve from moving downward.

[0024] The technical effects and advantages of the present invention are as follows:

[0025] 1. The present invention provides a protective component. When a hydraulic system failure occurs during the lifting operation 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 operation 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 tower crane can continue to complete the lifting operation, avoiding long-term maintenance shutdowns and improving work efficiency.

[0026] 2. The present invention sets an early warning component. When the hydraulic cylinder fails and the output end is not fully extended or the hydraulic cylinder is not fully lifted into place and is retracted by mistake, the telescopic member will gradually compress the second elastic member to slide in the telescopic groove, which will make the first conductive member contact the second conductive member to achieve electrical conduction, causing the alarm to sound an alarm to remind the staff, thereby protecting the protection component and the hydraulic cylinder to avoid damage to the piston cylinder, piston and piston rod. It can also determine whether the lifting work is in place through the alarm. On the one hand, it can avoid the tower crane from becoming unstable or overturning due to improper operation, effectively prevent the occurrence of accidents, and further ensure the safety of construction workers. 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

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the jacking frame structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the position of the protection component of the present invention;

[0030] Figure 4 For the present invention Figure 3 A magnified view of the structure of part A;

[0031] Figure 5 This is a schematic diagram of the structure of the protection component of the present invention;

[0032] Figure 6 This is a partial structural cross-sectional view of the piston cylinder of the present invention;

[0033] Figure 7 This is a cross-sectional view of the internal structure of the piston cylinder of the present invention;

[0034] Figure 8 For the present invention Figure 7 A magnified view of the structure of part B;

[0035] Figure 9 This is a cross-sectional view of the internal structure of the switching slot of the present invention;

[0036] Figure 10 This is a cross-sectional view of the internal structure of the oil storage tank of the present invention;

[0037] Figure 11 This is a cross-sectional view of the oil outlet structure of the present invention;

[0038] Figure 12 This is a structural diagram of the switching board of the present invention.

[0039] 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; 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 part; 317. Second magnetic part; 318. Third magnetic part; 4. Early warning component; 41. Telescopic part; 42. Telescopic slot; 43. Second elastic part; 44. First conductive part; 45. Second conductive part; 46. Alarm. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention. Example 1

[0041] 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 crane can only be shut down for repair, which affects the installation efficiency.

[0042] refer to Figures 1-12 A tower crane with a dual-circuit jacking system according to one embodiment of the present invention includes a tower body 1, which is composed of a plurality of vertically stacked standard sections 11. A jacking sleeve 2 is provided on the outer side of the tower body 1, and a jacking assembly 21 is provided on the jacking sleeve 2. A slewing device 12 is provided above the jacking sleeve 2, and a lifting device 13 is provided on the slewing device 12.

[0043] 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.

[0044] When the lifting beam 213 is clamped inside the two limiting members 111 , the hydraulic cylinder 212 extends to drive the lifting sleeve 2 to move along the length direction of the tower body 1 .

[0045] 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 limit members 111. After the hydraulic cylinder 212 retracts, the two positioning members 214 can be engaged with the two limit members 111, thereby limiting the lifting sleeve 2 and preventing the lifting sleeve 2 from moving downward.

[0046] When the tower crane needs to be raised, a standard section 11 is hoisted onto the jacking sleeve 2 by the lifting device 13, and then a standard section 11 is hoisted for counterweight to prevent imbalance during the jacking process. The jacking crossbeam 213 on the retracted hydraulic cylinder 212 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 sleeve 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 to limit the jacking sleeve 2. The jacking sleeve 2 cannot move downward, and the standard section 11 can be installed at this time. 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.

[0047] refer to Figure 3-Figure 12 , also includes a protection component 3, the protection component 3 is arranged on the jacking component 21, and is used to support the jacking component 21 when the 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. 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 two pistons 32 are fixedly connected to piston rods 33 on one side away from the supporting crossbeam 211. The other ends of the two piston rods 33 are connected to the jacking component 21. 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 to 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.

[0048] 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. A switching plate 311 is fixedly connected to 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. A one-way valve 314 is provided in the two first oil outlet grooves 312. The interior of the oil storage tank 34 is provided with driving grooves 315 with the same number and corresponding positions as the switching grooves 310. Both ends of the extrusion plate 35 are fixedly connected to a first magnetic member 316 that is slidably connected to the corresponding driving groove 315. A second magnetic member 317 and a third magnetic member 318 that can correspond to the position of the corresponding first magnetic member 316 are fixedly embedded on the two switching plates 311.

[0049] 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 .

[0050] refer to Figures 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 to each other. The two first magnetic members 316 can push the two switching plates 311 to move by the repulsion of the same poles with 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.

[0051] When the first elastic member 36 is fully released and pushes the extrusion plate 35 to move to the extreme position, the positions of the two first magnetic members 316 correspond to those of the two third magnetic members 318. 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 correspond to those of the two oil outlet holes 37.

[0052] In actual use, when the output end of the hydraulic cylinder 212 is extended 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. The two piston rods 33 will drive the two pistons 32 to move in the corresponding piston cylinder 31 during the extension process. Since the hydraulic oil in the oil tank 34 cannot enter the piston cylinder 31 when the piston rod 33 is in the retracted state, the hydraulic oil in the oil tank 34 will push the extrusion plate 35 to the extreme position at the top of the oil 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 positions of the two first oil outlet grooves 312 and the two oil outlet holes 37 can correspond. Therefore, when the two piston rods 33 extend to drive the two pistons 32 to move in the corresponding piston cylinder 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.

[0053] When the hydraulic system fails during the lifting operation of the hydraulic cylinder 212, since the two first oil outlet grooves 312 are both 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 cylinder 31 can prevent the piston rod 33 from retracting. The two piston rods 33 can continue to support the jacking beam 213, which can prevent the jacking sleeve 2 from falling, thereby protecting the lifting operation of the tower crane and ensuring the safety of the construction workers.

[0054] 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 through the opposite magnetic attraction with 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 back into the oil storage tank 34 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.

[0055] 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 shutdowns and improving work efficiency.

[0056] The two piston rods 33 extend and retract synchronously with the hydraulic cylinder 212, which can prevent the force applied to the lifting beam 213 from being offset and play a stabilizing role during the operation of the hydraulic cylinder 212.

[0057] To sum up, through the setting of the protection component 3, when the hydraulic system fails during the lifting operation 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 operation 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 operation of the tower crane can continue to be completed, avoiding long-term maintenance shutdowns and improving work efficiency. Example 2

[0058] During actual use, when the hydraulic cylinder fails and is damaged, the hydraulic cylinder may not be able to fully extend and cannot reach the specified height. If manual operation is performed when the jacking sleeve has not reached the specified height, it may cause the hydraulic cylinder and the protective component to affect each other, resulting in damage to the hydraulic cylinder and the protective component, and the safety of the construction workers cannot be guaranteed. Therefore, this embodiment improves the device described in the above embodiment.

[0059] 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 improper operation when the jacking height of the jacking component 21 does not meet the operating requirements. The early warning component 4 includes two telescopic parts 41, and the ends of the two piston rods 33 extending out of the corresponding piston cylinder 31 are each provided with a telescopic groove 42. The two telescopic parts 41 are respectively slidably connected in the two telescopic grooves 42, and a second elastic part 43 is connected between the end of the two telescopic parts 41 located inside the corresponding telescopic groove 42 and the corresponding telescopic groove 42. 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.

[0060] refer to Figure 8A 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 fully 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.

[0061] During actual use, when the output end of the hydraulic cylinder 212 extends to perform the lifting work, the hydraulic cylinder 212 will drive the two piston rods 33 to extend out of the piston cylinder 31 through the lifting beam 213 and the telescopic part 41. During this process, the telescopic part 41 will not compress the second elastic part 43, and the first conductive part 44 and the second conductive part 45 cannot contact each other.

[0062] When the output end of the hydraulic cylinder 212 is fully extended to complete the current jacking operation, and during the process of retraction again, since the elastic coefficients of the two second elastic members 43 are greater than the elastic coefficients of the first elastic member 36, the hydraulic cylinder 212 contracts and drives the jacking beam 213 to move, so that the two telescopic members 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 member 43 will not be completely compressed, and the first conductive member 44 and the second conductive member 45 cannot contact each other. Therefore, when the hydraulic cylinder 212 is working normally, the first conductive member 44 and the second conductive member 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.

[0063] When a fault occurs in the hydraulic cylinder 212, resulting in the output end not being fully extended or the hydraulic cylinder 212 not being fully lifted into place and being retracted by mistake, 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 mistakenly operates the hydraulic cylinder 212 to retract, 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, avoiding damage to the piston cylinder 31, the piston 32 and the piston rod 33, and also judging whether the lifting work is in place through the alarm 46, thereby avoiding instability or overturning of the tower crane due to improper operation, effectively preventing the occurrence of accidents, and further ensuring the safety of construction workers.

[0064] 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 an erroneous operation, the telescopic member 41 will gradually compress the second elastic member 43 to slide in the telescopic groove 42, which will cause 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, piston 32 and 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 tower crane from becoming unstable or overturning 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 overall construction efficiency.

[0065] 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 scope of protection of the present invention.

Claims

1. A tower crane with a double-circuit jacking system, comprising a tower body (1), wherein the tower body (1) is composed of a plurality of vertically stacked standard sections (11), a jacking frame (2) is provided on the outer side of the tower body (1), a jacking assembly (21) is provided on the jacking frame (2), a slewing device (12) is provided above the jacking frame (2), and a lifting device (13) is provided on the slewing device (12), 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), the early warning component (4) being arranged on the protection component (3) and used to issue an alarm for erroneous operation when the lifting height of the lifting component (21) does not meet the operation requirements; The jacking assembly (21) comprises a supporting beam (211) fixed on the jacking sleeve (2), a hydraulic cylinder (212) is hingedly connected to the inner center position of the supporting beam (211), and a jacking beam (213) is hingedly connected to the output end of the hydraulic cylinder (212); The protection assembly (3) includes two piston cylinders (31) hinged to the inner side of the support 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 support beam (211) are fixedly connected to piston rods (33), and the other ends of the two piston rods (33) are hinged to the lifting beam (213); An oil storage tank (34) is fixedly connected to the supporting crossbeam (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 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); 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 a switching plate (311) is fixedly connected to each of the two switching grooves (310). A first oil outlet groove (312) and a second oil outlet groove (313) are provided on each of the two switching plates (311), and a one-way valve (314) is provided in each of 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); The oil storage tank (34) is provided with driving slots (315) having the same number as the switching slots (310) and corresponding positions. Both ends of the extrusion plate (35) are fixedly connected with first magnetic members (316) that are slidably connected to the corresponding driving slots (315). The two switching 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).

2. The tower crane with a dual-circuit jacking system according to claim 1, 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 to each other, and the two first magnetic members (316) can drive the two switching plates (311) to move by attracting the 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 to each other.

3. The tower crane with a dual-circuit jacking system according to claim 2, characterized in that: The warning assembly (4) includes two telescopic parts (41), and the ends of the two piston rods (33) extending out of the corresponding piston cylinder (31) are each 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 the ends of the two telescopic parts (41) located inside the corresponding telescopic groove (42) and the corresponding telescopic groove (42). The ends of the two telescopic parts (41) away from the corresponding second elastic part (43) are both hinged to the lifting beam (213), and the elastic coefficients of the two second elastic parts (43) are both greater than the elastic coefficient of the first elastic part (36).

4. The tower crane with a dual-circuit jacking system according to claim 3, characterized in that: The two telescopic members (41) are each provided with a first conductive member (44) at one end located inside the corresponding telescopic slot (42), and the two telescopic slots (42) are each provided with a second conductive member (45), and the jacking sleeve (2) is provided with an alarm (46); 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, and the alarm (46) can sound an alarm.

5. The tower crane with a dual-circuit jacking system according to claim 4, characterized in that: Each of the standard sections (11) is fixedly connected to two limiting 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 limiting 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 limiting members (111) respectively.

6. The tower crane with a dual-circuit jacking system according to claim 5, characterized in that: When the lifting beam (213) is clamped inside the two limiting 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); 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), thereby limiting the lifting sleeve (2) and preventing the lifting sleeve (2) from moving downward.

Images