CN102030273B - Tower crane, lifting mechanism thereof and leveling method of lifting mechanism - Google Patents
Tower crane, lifting mechanism thereof and leveling method of lifting mechanism Download PDFInfo
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- CN102030273B CN102030273B CN201110001444A CN201110001444A CN102030273B CN 102030273 B CN102030273 B CN 102030273B CN 201110001444 A CN201110001444 A CN 201110001444A CN 201110001444 A CN201110001444 A CN 201110001444A CN 102030273 B CN102030273 B CN 102030273B
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- 238000004804 winding Methods 0.000 claims abstract description 65
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
- B66C23/26—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/22—Control systems or devices for electric drives
- B66C13/23—Circuits for controlling the lowering of the load
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- Jib Cranes (AREA)
Abstract
The invention discloses a tower crane, a hoisting mechanism thereof and a leveling method of the hoisting mechanism, wherein the hoisting mechanism comprises: the first lifting unit comprises a first driving mechanism (11) and a first winding drum (12), and the first driving mechanism (11) drives the first winding drum (12) to rotate; the second lifting unit comprises a second driving mechanism (21) and a second winding drum (22), and the second driving mechanism (21) drives the second winding drum (22) to rotate; the lifting assembly is provided with a lifting hook cross beam (4) and a lifting hook arranged below the lifting hook cross beam (4), wherein a first rope (31) on a first drum (12) extends out of the first drum (12) and is connected to one end of the lifting hook cross beam (4); a second rope (32) on the second drum (22) extends from the second drum (22) and is connected to the other end of the hook beam (4). The hoisting mechanism has greatly increased hoisting capacity and increased rope capacity, and is suitable for high hoisting height and heavy hoisting.
Description
Technical Field
The invention relates to a tower crane, in particular to a tower crane, a lifting mechanism thereof and a leveling method of the lifting mechanism.
Background
The tower crane is a material transportation machine widely applied to construction sites. The most of the tower cranes widely used at present are single-hook single-drive, a set of driving mechanism, such as a speed reducing motor and a braking device, is used for driving a winding drum, the hoisting weight is small, the rope capacity is low, when the driving mechanism breaks down, the tower crane not only needs to be immediately stopped and overhauled, but also can be maintained by hoisting accessories by means of other power devices. When lifting heavy weight, need dispose great specification actuating mechanism, be unfavorable for improving the commonality of product.
The existing single-drive hoisting mechanism mainly comprises an L-shaped hoisting mechanism and an n-shaped hoisting mechanism. In the hoisting mechanism arranged in an L shape, the axis of the winding drum and the axis of the driving mechanism form an angle of 90 degrees, so that the interference between the driving mechanism and the winding drum can be avoided, and the diameter of the winding drum can be large and changed into a large and short winding drum; however, because the motor, the speed reducer, the brake and the main beam in the driving mechanism are all arranged on the same side, if the winding drum is centered, the single side of the balance arm of the crane is seriously loaded, and the load on the balance arm is unfavorable, and once the operation is improper, the stability is easy to lose due to the tower height and the arm length; for the super-large tower crane, the weight of the motor, the speed reducer, the brake and the main beam is heavy, so the condition is more serious. Meanwhile, the rope holding capacity is small due to structural limitation, the rope holding capacity is difficult to exceed 1400 meters, and the requirements on the conditions of high lifting height and heavy lifting weight cannot be met. For the hoisting mechanism arranged in a reverse U shape, the rope capacity is difficult to exceed 500 meters due to the structural limitation.
At present, in the field, among hoisting mechanisms of tower cranes, hoisting mechanisms arranged in a straight line, hoisting mechanisms arranged in a U-shape, and the like are also available. For the hoisting mechanism arranged in a straight line shape, because the motor, the speed reducer, the brake and the winding drum are arranged on the same straight line, the total length is longer, and for a large-scale tower crane, the structure is not generally adopted as a main hoisting structure due to the limitation of the width of the balance arm. The hoisting mechanism in a "U" shape is also called a dual-drive hoisting mechanism because the drum is driven by two motors and speed reducers, and the structure of the hoisting mechanism is as shown in fig. 1, and includes a first driving mechanism 11, a second driving mechanism 21 and a drum 2, wherein the first driving mechanism 11 may include a first motor 111 ', a first brake 112 ' and a first speed reducer 113 ' which are connected in sequence, the second driving mechanism 21 ' may include a second motor 211 ', a second brake 212 ' and a second speed reducer 213 ' which are connected in sequence, the first speed reducer 113 ' and the second speed reducer 213 ' are connected with the drum 2 ', and the first driving mechanism 11 ', the second driving mechanism 21 ' and the drum 2 ' form a "U" shape. The mechanism has the greatest advantages that when one motor or one speed reducer breaks down, the mechanism can still work normally, and the hoisting weight of the mechanism is 50% of the rated hoisting weight; the disadvantages are that: the rope holding capacity is difficult to exceed 1400 meters due to the same structural limitation; when only one motor works, the other set of motor becomes a load, so that the transmission efficiency of the mechanism is lower.
The hoisting mechanisms arranged in the pi shape and the hoisting mechanisms arranged in the U shape can overcome the defect that the single-drive hoisting mechanism is unbalanced relative to the balance arm, but the hoisting weight and the rope containing amount are still lower.
Disclosure of Invention
The invention aims to solve the technical problem of providing a hoisting mechanism of a tower crane, which has large hoisting weight and high rope capacity.
Another object of the present invention is to provide a hoisting mechanism of a tower crane that is balanced with respect to a balance arm of the tower crane.
The invention aims to solve the other technical problem of providing a hoisting mechanism of a tower crane, which has double drives and double drums and can be reliably leveled.
The invention further aims to provide a leveling method of the hoisting mechanism.
To solve the above technical problem, according to an aspect of the present invention, there is provided a hoisting mechanism including: the first lifting unit comprises a first driving mechanism and a first winding drum, and the first driving mechanism drives the first winding drum to rotate; the second lifting unit comprises a second driving mechanism and a second winding drum, and the second driving mechanism drives the second winding drum to rotate; the lifting assembly is provided with a lifting hook cross beam and a lifting hook arranged below the lifting hook cross beam, wherein a first rope on a first reel extends out of the first reel and is connected to one end of the lifting hook cross beam; a second rope on a second drum extends from the second drum and is connected to the other end of the hook beam.
Furthermore, the first lifting unit also comprises a first reversing pulley and a first pulley block which are sequentially arranged between the first winding drum and the lifting assembly, and the first rope sequentially passes through the first reversing pulley and the first pulley block; the second hoisting unit further comprises a second reversing pulley and a second pulley block, the second reversing pulley and the second pulley block are sequentially arranged between the second winding drum and the hoisting component, and the second rope sequentially passes through the second reversing pulley and the second pulley block.
Further, the first lifting unit is configured in an L-shaped configuration, wherein the first drive mechanism is vertically connected with the first reel axis, and the second lifting unit is configured in an L-shaped configuration, wherein the second drive mechanism is vertically connected with the second reel axis; the first driving mechanism and the second driving mechanism are arranged in parallel in axis, and the first winding drum and the second winding drum are both positioned between the first driving mechanism and the second driving mechanism.
Further, the first drum is located on the rear side of the second drum facing the hoist assembly, the first drive mechanism extends forward from the side of the first drum to the side of the second drum, and the second drive mechanism extends rearward from the side of the second drum to the side of the first drum.
Further, the first driving mechanism comprises a first motor, a first brake and a first speed reducer which are connected in sequence; the second driving mechanism comprises a second motor, a second brake and a second speed reducer which are connected in sequence.
Furthermore, the lifting mechanism is provided with a control unit which controls the first driving mechanism to drive the first winding drum and the second driving mechanism to drive the second winding drum to synchronously rotate, so that the lifting hook cross beam is kept horizontal.
The first detection unit comprises a levelness detector, is arranged on the lifting hook cross beam and is used for sensing the levelness of the lifting hook cross beam and forming a levelness signal; the control unit controls the first driving mechanism and the second driving mechanism through the levelness signal, and further controls the rotating speed of the first winding drum and the rotating speed of the second winding drum.
Further, the first detection unit further includes: the wireless transmitting module is positioned near the level detector and sends out a levelness signal formed by the level detector; and the wireless receiving module is positioned near the control unit, receives the levelness signal and transmits the levelness signal to the control unit.
Further, still include the second detecting element, the second detecting element includes: the two induction blocks are respectively arranged on the reversing pulleys; the two proximity switches are respectively arranged on the frame body supporting the reversing pulleys and are matched with the induction block to sense the running speed of the reversing pulleys and form corresponding pulse signals; the control unit controls the first driving mechanism and the second driving mechanism through a levelness signal or a pulse signal, and further controls the rotating speed of the first winding drum and the rotating speed of the second winding drum.
Further, still include the third detecting element, the third detecting element includes: and the levelness indicator needle is arranged on the lifting hook cross beam and used for indicating the levelness of the lifting hook cross beam.
According to one aspect of the invention there is provided a crane comprising any one of the hoisting mechanisms described above.
According to a further aspect of the invention, there is provided a method of levelling a hoisting mechanism as described above, comprising: receiving a levelness signal of the hook beam detected by a level detector, and simultaneously receiving a pulse signal which is detected by a proximity switch arranged on the reversing pulley and indicates the rotating speed of the reversing pulley; and controlling the rotating speeds of the two drums connected with the two ends of the lifting hook cross beam through the lifting rope respectively according to the levelness signal or the pulse signal so as to adjust the level of the lifting hook cross beam.
Further, the step of controlling the rotation speed of the two drums according to the levelness signal to adjust the level of the hook beam comprises: checking the levelness signal data to judge whether the levelness signal is correct; if the levelness signal is verified to be correct, controlling the rotating speeds of the two drums according to the levelness signal so as to adjust the level of the lifting hook cross beam; and if the levelness signal is not verified correctly, controlling the rotating speed of the two winding drums according to the pulse signal so as to adjust the level of the hook cross beam.
Further, the step of receiving the levelness signal of the hook beam detected by the level detector includes: sending out a levelness signal formed by the level detector by using a wireless transmitting module; and receiving the levelness signal by using the wireless receiving module and transmitting the levelness signal to the control unit.
The invention has the following beneficial effects:
1. the lifting mechanism comprises two sets of lifting units, each set of lifting unit comprises a set of driving mechanism and a winding drum, and two sets of ropes on the two winding drums are respectively connected with one end of the lifting hook cross beam, so that the lifting capacity of the lifting mechanism is greatly increased, the rope capacity is increased, and the lifting mechanism can adapt to the conditions of high lifting height and heavy lifting weight. In addition, when one set of lifting unit breaks down and needs to be overhauled, the lifting hook cross beam and the pulley block in the set of lifting unit are disassembled, and the other set of lifting unit can still work without influencing the use of the tower crane.
2. In the hoisting mechanism of the invention, two hoisting units can be set to be L-shaped structures, each hoisting unit is provided with a winding drum vertically connected with a driving mechanism, the two driving mechanisms are arranged in parallel, the two winding drums are positioned between the two driving mechanisms, and preferably, the first driving mechanism can extend backwards from the side surface of the first winding drum to the side surface of the second winding drum, and the second driving mechanism extends backwards from the side surface of the second winding drum to the side surface of the first winding drum, so that a symmetrical structure can be formed, the whole hoisting mechanism is symmetrical relative to a balance arm, and the tower crane is more stable.
3. The hoisting mechanism of the invention can also comprise a level detector which can preferably use a wireless transmitting module and a wireless receiving module to transmit a levelness signal, and more preferably, the level detector can also comprise a detection unit consisting of an induction block and a proximity switch, and the detection unit is used for detecting the rope feeding speed of the two drums, detecting the levelness of the hook beam by using the two signals and further controlling the rotating speed of the two driving mechanisms according to the levelness of the hook beam to keep the hook beam horizontal.
4. The leveling method of the hoisting mechanism simultaneously receives the levelness signal and the pulse signal, and can level by using the pulse signal when the levelness signal is checked to have errors, so that the reliable leveling of the hoisting mechanism is realized.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic top view of a hoisting mechanism according to a "U" arrangement of the prior art;
fig. 2 is a schematic top view of a hoist according to a first embodiment of the invention;
fig. 3 is a front view structural schematic diagram of a hoisting mechanism according to a first embodiment of the invention;
fig. 4 is a schematic structural view of a tower crane of a hoisting mechanism according to a first embodiment of the invention;
fig. 5 is a schematic view of a hook beam and first and third detection units thereon in a hoisting mechanism according to a first embodiment of the invention;
fig. 6 is a schematic view of a second detection unit in the hoist according to the first embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 2, 3 and 4, the hoisting mechanism in the present invention includes a first hoisting unit and a second hoisting unit, the first hoisting unit includes a first driving mechanism 11 and a first reel 12, the first driving mechanism 11 drives the first reel 12 to rotate; the second hoisting unit comprises a second drive mechanism 21 and a second reel 22, the second drive mechanism 21 driving the second reel 22 to rotate. In addition, as shown in fig. 4 and 5, the hoisting assembly has a hook beam 4 and a hook provided below the hook beam 4. As can be seen in fig. 3 and 4, the first rope 31 on the first drum 12 extends from the first drum 12, being connected to one end of the hook beam 4; a second rope 32 on the second drum 22 extends from the second drum 22 and is connected to the other end of the hook beam 4.
It can be understood that the hoisting capacity of the hoisting mechanism is greatly increased and the rope capacity is increased due to the structure of the two sets of hoisting units, and compared with the existing single-drive hoisting mechanism and the existing hoisting mechanism arranged in a reversed U shape and the hoisting mechanism arranged in a U shape, the hoisting mechanism has two sets of driving mechanisms and two sets of winding drums, so that the hoisting mechanism can adapt to the conditions of high hoisting height and heavy hoisting weight. Specifically, two independent hoisting units drive two ropes, and then the two ropes respectively pull two ends of a lifting hook through a lifting hook cross beam 4, so that each set of mechanism only bears half of the rated lifting weight of the tower crane, and the rope capacity and the lifting weight capacity of the whole machine are doubled on the basis of the original L-shaped mechanism. In addition, when one set of lifting unit breaks down and needs to be overhauled, the lifting hook cross beam and the pulley block in the set of lifting unit are disassembled, and the other set of lifting unit can still work without influencing the use of the tower crane.
In this embodiment, as shown in fig. 3 and 4, the first lifting unit further comprises a first diverting pulley 13 and a first pulley block 14, which are sequentially disposed between the first winding drum 12 and the lifting assembly, and similarly, the second lifting unit further comprises a second diverting pulley 23 and a second pulley block 24, which are sequentially disposed between the second winding drum 22 and the lifting assembly. The first rope 31 passes through the first diverting pulley 13 and the first pulley block 14 in sequence; likewise, the second rope 32 passes in sequence through the second diverting pulley 23 and the second pulley block 24.
Preferably, as shown in fig. 2, two lifting units may be arranged in the following structure: the first lifting unit is configured in an L-shaped configuration, wherein the first drive mechanism 11 and the first reel 12 are connected axially vertically, and the second lifting unit is configured in an L-shaped configuration, wherein the second drive mechanism 21 and the second reel 22 are connected axially vertically; the first drive mechanism 11 and the second drive mechanism 21 are arranged in parallel with each other in axis, and the first reel 12 and the second reel 22 are located between the first drive mechanism 11 and the second drive mechanism 21. Thus, a symmetrical structure is formed, so that the whole hoisting mechanism is symmetrical relative to the balance arm 8 (shown in figure 4), the tower crane is more stable, and the problem that the whole crane is easy to be unstable due to the single-drive hoisting mechanism in the prior art is solved.
More preferably, in the present embodiment, as can be seen in the top view of fig. 2, the first winding drum 12 is located on the rear side of the second winding drum 22 facing the hoisting assembly, the first driving mechanism 11 extends forward from the side of the first winding drum 12 to the side of the second winding drum 22, and the second driving mechanism 21 extends backward from the side of the second winding drum 22 to the side of the first winding drum 12. Therefore, the two hoisting units form a compact and symmetrical structure, so that the tower crane is more stable.
Preferably, the first driving mechanism 11 includes a first motor 111, a first brake 112 and a first speed reducer 113 connected in sequence; the second drive mechanism 21 includes a second motor 211, a second brake 212, and a second reduction gear 213, which are connected in this order. The first speed reducer 113 is connected to the first drum 12, and the second speed reducer is connected to the second drum 22.
However, the structure of the dual-drive dual-drum is easy to tilt when lifting a heavy object, so it is necessary to ensure that the linear speeds of the ropes on the two independent drums are consistent, that is, to ensure that the first drum 12 and the second drum 22 rotate synchronously to ensure the level of the hook beam 4, otherwise, the hook cannot be in a relatively horizontal position during the operation process, which may cause a potential safety hazard of lifting a heavy object and sliding a hook. In this embodiment, the hoisting mechanism is preferably provided with a control unit which controls the first drive mechanism 11 to drive the first reel 12 and the second drive mechanism 21 to drive the second reel 22 to rotate synchronously so that the hook beam 4 is kept horizontal.
More preferably, as shown in fig. 5, the hoisting mechanism according to the first embodiment of the invention further comprises a first detection unit 5, wherein the first detection unit 5 comprises a levelness detector 51, which is arranged on the hook beam 4 and is used for sensing the levelness of the hook beam 4 and forming a levelness signal; the control unit controls the first driving mechanism 11 and the second driving mechanism 21 according to the levelness signal sent by the levelness detector 51, specifically, in the embodiment, controls the rotation speed of the first motor 111 and the second motor 211, and further controls the rotation speed of the first reel 11 and the second reel 21. That is, through the setting of the electronic control program, when the error of the retraction amount of the two ropes is judged to exceed the deviation allowable value of the hook group according to the levelness signal, the electronic control system compensates the original accumulated error of the retraction of the two ropes by adjusting the rotating speed of the first motor 111 and the second motor 211, so that the hook returns to the horizontal state. The hook is therefore always in "dynamic" equilibrium during movement.
As the angle of inclination data (i.e. the levelness signal) is transmitted through the cable, not only is it extremely difficult to wire the data reasonably, but also the sensor signal is greatly attenuated by the long-distance transmission, thereby causing great potential safety hazard. Thus, in the present embodiment, preferably, the first detection unit 5 further includes: a wireless transmitting module and a wireless receiving module (not shown in the figure), wherein the wireless transmitting module is positioned near the level detector and sends out a levelness signal formed by the level detector; the wireless receiving module is positioned near the control unit, receives the levelness signal and transmits the levelness signal to the control unit. Thus, the difficulty of wiring is avoided, and the defect of signal attenuation in cable transmission is avoided.
However, if the distance is too long (more than 200 m) and the signal is interfered by wireless transmission, data frame loss, distortion and the like may occur, and the level detector 51 may not detect the levelness and send out the signal due to its own reason (such as self failure, battery exhaustion and the like). At this time, preferably, in the present embodiment, a second detecting unit 7 may be further provided in the hoisting mechanism, as shown in fig. 6, the second detecting unit 7 including: a first sensing block 71, a first proximity switch 73, a second sensing block 72, and a second proximity switch 74. Wherein the first induction block 71 and the second induction block 72 are respectively arranged on the first diverting pulley 13 and the second diverting pulley 23; the first and second proximity switches 73 and 74 are respectively provided on the frame body supporting the first and second diverting pulleys 13 and 23, and are provided in cooperation with two sensing blocks to sense the traveling speed of the diverting pulleys and form corresponding pulse signals, that is, the two proximity switches respectively form two sets of pulse signals indicating the speeds of the first and second ropes 31 and 32, respectively.
The control unit may control the first driving mechanism 11 and the second driving mechanism 21 by a levelness signal or a pulse signal, and further control the rotation speed of the first bobbin 11 and the second bobbin 21. Specifically, the control unit may be primarily directed to the leveling of the wirelessly transmitted levelness signal as described above, and secondarily directed to the proximity switch pulse leveling as described herein. The level detector 51 directly obtains information of the current level condition of the hook, wirelessly transmits a levelness signal to a control unit (e.g., a master PLC), and calibrates the pulse leveling data, for example, the master PLC checks to determine whether the data is reliable. When the wireless data transmission is subjected to the conditions of distortion, frame loss and the like of external interference data, namely the master control PLC cannot receive effective data within a certain time (which can be set) due to factors such as distance, interference and the like, pulse leveling is carried out according to the data of the proximity switch corrected for the last time, and when the effective levelness signal data is received again, namely the levelness signal of the levelness signal leveling mode of the wireless transmission is recovered, the leveling mode of the wireless transmission levelness signal is continuously used. Therefore, the advantages of accurate measurement data of the wireless leveling system and stable data obtained in a pulse leveling mode are brought into play, the gap of data loss of the wireless leveling system when the data are interfered is effectively made up, and the accuracy, safety and reliability of the leveling of the lifting hook in the using process of the double-hook lifting crane are greatly improved.
More preferably, as shown in fig. 5, in this embodiment, the hoisting mechanism further includes a third detection unit 6, and the third detection unit 6 includes a levelness indicator pin, which is disposed on the hook beam and is used for indicating the levelness of the hook beam. When the levelness signal and the pulse signal cannot be received due to special reasons, an operator can manually intervene two driving mechanisms by visually observing the levelness indicator needle, so that the lifting hook is restored to a horizontal state.
From the above, it can be understood that the invention also provides a tower crane, which is provided with any one of the hoisting mechanisms described above, so that the hoisting capacity of the tower crane is greatly increased, the rope capacity is increased, and the tower crane can adapt to the conditions of high hoisting height and heavy hoisting capacity. The whole tower crane is more balanced and stable.
In addition, as can be further understood from the above, the present invention also provides a leveling method of the hoisting mechanism, including: receiving a levelness signal of the hook beam detected by a level detector, and simultaneously receiving a pulse signal which is detected by a proximity switch arranged on the reversing pulley and indicates the rotating speed of the reversing pulley; and controlling the rotating speeds of the two winding drums which are respectively connected with the two ends of the lifting hook cross beam through the lifting rope according to the levelness signal or the pulse signal so as to adjust the level of the lifting hook cross beam.
The method ensures that the linear speeds of the ropes on the two independent winding drums are consistent, thereby ensuring the level of the lifting hook cross beam 4 and avoiding the potential safety hazard of lifting a weight sliding hook caused by the fact that the lifting hook cannot be in a relative horizontal position in the operation process.
Preferably, controlling the rotation speeds of the two drums connected to both ends of the hook beam through the hoist rope, respectively, according to the levelness signal and the pulse signal to adjust the level of the hook beam includes: checking the levelness signal data to judge whether the levelness signal is correct; if the levelness signal is verified to be correct, controlling the rotating speeds of the two drums according to the levelness signal so as to adjust the level of the lifting hook cross beam; and if the levelness signal is not verified correctly, controlling the rotating speed of the two winding drums according to the pulse signal so as to adjust the level of the hook cross beam.
More preferably, the step of receiving a hook beam levelness signal detected by the level detector comprises: sending out a levelness signal formed by the level detector by using a wireless transmitting module; and receiving the levelness signal by using the wireless receiving module and transmitting the levelness signal to the control unit.
In addition, when the levelness signal and the pulse signal cannot be received due to special reasons, an operator can manually intervene on the two driving mechanisms by visually observing the levelness indicator needle, so that the lifting hook returns to a horizontal state.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A hoisting mechanism of a tower crane, comprising:
a first lifting unit comprising a first drive mechanism (11) and a first reel (12), the first drive mechanism (11) driving the rotation of the first reel (12);
a second lifting unit comprising a second drive mechanism (21) and a second reel (22), the second drive mechanism (21) driving rotation of the second reel (22);
the hoisting assembly is provided with a lifting hook cross beam (4) and a lifting hook arranged below the lifting hook cross beam (4),
wherein,
a first rope (31) on the first drum (12) extending from the first drum (12) and connected to one end of the hook beam (4);
a second rope (32) on the second drum (22) extending from the second drum (22) and connected to the other end of the hook beam (4);
the first lifting unit is configured in an L-shaped structure, wherein the first driving mechanism (11) and the first reel (12) are axially and vertically connected,
the second lifting unit is configured in an L-shaped structure, wherein the second driving mechanism (21) and the second winding drum (22) are connected with axes vertical;
the first drive mechanism (11) and the second drive mechanism (21) are arranged in parallel with each other in axis, and the first reel (12) and the second reel (22) are both located between the first drive mechanism (11) and the second drive mechanism (21);
the first winding drum (12) is located at the rear side of the second winding drum (22) facing the hoisting assembly, the first driving mechanism (11) extends forward from the side of the first winding drum (12) to the side of the second winding drum (22), and the second driving mechanism (21) extends backward from the side of the second winding drum (22) to the side of the first winding drum (12).
2. A hoisting mechanism according to claim 1,
the first lifting unit further comprises a first reversing pulley (13) and a first pulley block (14), the first reversing pulley (13) and the first pulley block (14) are sequentially arranged between the first winding drum (12) and the lifting assembly, and the first rope (31) sequentially passes through the first reversing pulley (13) and the first pulley block (14);
the second hoisting unit further comprises a second reversing pulley (23) and a second pulley block (24), the second reversing pulley (23) and the second pulley block (24) are sequentially arranged between the second winding drum (22) and the hoisting component, and the second rope (32) sequentially passes through the second reversing pulley (23) and the second pulley block (24).
3. A hoisting mechanism according to claim 1,
the first driving mechanism (11) comprises a first motor (111), a first brake (112) and a first speed reducer (113) which are connected in sequence;
the second driving mechanism (21) comprises a second motor (211), a second brake (212) and a second speed reducer (213) which are connected in sequence.
4. Hoisting mechanism according to claim 2, characterized in that the hoisting mechanism is provided with a control unit for controlling the first drive mechanism (11) to drive the first drum (12) and the second drive mechanism (21) to drive the second drum (22) in synchronous rotation, so that the hook beam (4) is kept horizontal.
5. A hoisting mechanism according to claim 4,
the hoisting mechanism further comprises a first detection unit (5), wherein the first detection unit (5) comprises a horizontal detector (51) which is arranged on the hook beam (4) and used for sensing the levelness of the hook beam (4) and forming a levelness signal;
the control unit controls the first driving mechanism (11) and the second driving mechanism (21) through the levelness signal, and further controls the rotating speed of the first winding drum (11) and the second winding drum (21).
6. Hoisting mechanism according to claim 5, characterized in that the first detection unit (5) further comprises:
the wireless transmitting module is positioned near the level detector and sends out the levelness signal formed by the level detector;
and the wireless receiving module is positioned near the control unit, receives the levelness signal and transmits the levelness signal to the control unit.
7. A hoisting mechanism according to claim 5,
the hoisting mechanism further comprises a second detection unit (7), the second detection unit (7) comprising:
the two induction blocks are respectively arranged on the first reversing pulley and the second reversing pulley;
the two proximity switches are respectively arranged on a frame body supporting the first reversing pulley and the second reversing pulley and are respectively matched with the induction blocks arranged on the first reversing pulley and the second reversing pulley so as to respectively sense the running speeds of the first reversing pulley and the second reversing pulley and respectively form corresponding pulse signals;
the control unit controls the first driving mechanism (11) and the second driving mechanism (21) through the levelness signal or the pulse signal, and further controls the rotating speed of the first winding drum (11) and the second winding drum (21).
8. Hoisting mechanism according to claim 4, characterized in that the hoisting mechanism further comprises a third detection unit (6), which third detection unit (6) comprises: and the levelness indicator needle is arranged on the lifting hook cross beam and used for indicating the levelness of the lifting hook cross beam.
9. A tower crane comprising a hoisting mechanism as claimed in any one of claims 1 to 8.
10. A method of leveling a hoist mechanism as claimed in claim 7, comprising:
receiving a levelness signal of a hook beam of the hoisting mechanism detected by a level detector of a first detection unit (5) of the hoisting mechanism, and simultaneously receiving corresponding pulse signals which are detected by proximity switches arranged on a first reversing pulley and a second reversing pulley and indicate the rotating speeds of the first reversing pulley and the second reversing pulley;
and controlling the rotating speed of a first winding drum (12) connected with one end of the hook beam through a first rope (31) and a second winding drum (22) connected with the other end of the hook beam through a second rope (32) according to the levelness signal or the pulse signal so as to adjust the level of the hook beam.
11. The method of claim 10, wherein the step of controlling the rotational speed of a first drum (12) connected to one end of the hook beam by a first rope (31) and a second drum (22) connected to the other end of the hook beam by a second rope (32) in accordance with the levelness signal or the pulse signal to adjust the level of the hook beam comprises:
checking the levelness signal data to judge whether the levelness signal is correct;
if the levelness signal is verified to be correct, controlling the rotating speed of the first winding drum (12) and the second winding drum (22) according to the levelness signal so as to adjust the level of the hook cross beam;
and if the levelness signal is not verified correctly, controlling the rotating speed of the first winding drum (12) and the second winding drum (22) according to the pulse signal so as to adjust the level of the hook cross beam.
12. A method according to claim 11, wherein the step of receiving a signal of the levelness of the hook beam of the hoisting mechanism detected by a level detector of the first detection unit (5) of the hoisting mechanism comprises:
sending the levelness signal formed by the level detector by using a wireless transmitting module;
and receiving the levelness signal by using a wireless receiving module, and transmitting the levelness signal to a control unit of the hoisting mechanism.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110001444A CN102030273B (en) | 2011-01-05 | 2011-01-05 | Tower crane, lifting mechanism thereof and leveling method of lifting mechanism |
| PCT/CN2011/078294 WO2012092768A1 (en) | 2011-01-05 | 2011-08-11 | Tower crane, lifting mechanism thereof, and method for leveling lifting mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110001444A CN102030273B (en) | 2011-01-05 | 2011-01-05 | Tower crane, lifting mechanism thereof and leveling method of lifting mechanism |
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| Publication Number | Publication Date |
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| CN102030273A CN102030273A (en) | 2011-04-27 |
| CN102030273B true CN102030273B (en) | 2012-09-12 |
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| CN201110001444A Active CN102030273B (en) | 2011-01-05 | 2011-01-05 | Tower crane, lifting mechanism thereof and leveling method of lifting mechanism |
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| WO (1) | WO2012092768A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102030273B (en) * | 2011-01-05 | 2012-09-12 | 中联重科股份有限公司 | Tower crane, lifting mechanism thereof and leveling method of lifting mechanism |
| CN102424279B (en) * | 2011-08-12 | 2014-01-22 | 中联重科物料输送设备有限公司 | Gate type bucket-wheel stacker reclaimer, and adjustment method and adjustment device for balance wheel thereof |
| CN102491186A (en) * | 2011-12-19 | 2012-06-13 | 中联重科股份有限公司 | Tower crane |
| CN103588103A (en) * | 2013-11-23 | 2014-02-19 | 湖北江汉建筑工程机械有限公司 | Multipurpose tower crane with double lifting hooks |
| DE102013021499A1 (en) * | 2013-12-18 | 2015-06-18 | Liebherr-Werk Ehingen Gmbh | Crane with alternative drive units |
| CN103803434B (en) * | 2014-02-13 | 2016-01-20 | 山东大汉建设机械股份有限公司 | The two lifting mechanism of a kind of tower crane linkage and speed regulating method |
| CN110921538A (en) * | 2019-12-23 | 2020-03-27 | 三一汽车起重机械有限公司 | Hoisting system and crane |
| CN113336113B (en) * | 2021-04-25 | 2022-06-03 | 中联重科股份有限公司 | Lifting device and engineering machinery |
| CN113979312A (en) * | 2021-11-22 | 2022-01-28 | 徐州建机工程机械有限公司 | Operating system and operating method of multi-mechanism tower crane |
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| CN102030273A (en) | 2011-04-27 |
| WO2012092768A1 (en) | 2012-07-12 |
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