WO2012092768A1

WO2012092768A1 - Tower crane, lifting mechanism thereof, and method for leveling lifting mechanism

Info

Publication number: WO2012092768A1
Application number: PCT/CN2011/078294
Authority: WO
Inventors: 郑兴; 郑捷; 易德辉
Original assignee: 长沙中联重工科技发展股份有限公司; 湖南中联重科专用车有限责任公司
Priority date: 2011-01-05
Filing date: 2011-08-11
Publication date: 2012-07-12
Also published as: CN102030273A; CN102030273B

Abstract

Disclosed is a lifting mechanism, comprising: a first lifting unit, comprising a first driving mechanism (11) and a first winding drum (12), the first driving mechanism (11) driving the first winding drum (12) to rotate; a second lifting unit, comprising a second driving mechanism (21) and a second winding drum (22), the second driving mechanism (21) driving the second winding drum (22) to rotate; and a hoisting assembly, having a lifting hook beam (4) and a lifting hook disposed below the lifting hook beam (4), a first rope (31) on the first winding drum (12) extending out of the first winding drum (12) and being connected to one end of the lifting hook beam (4), and a second rope (32) on the second winding drum (22) extending out of the second winding drum (22) and being connected to the other end of the lifting hook beam (4). Since the lifting mechanism comprises two lifting units, a weight hoisting capability of the lifting mechanism is improved and the rope reception capacity is increased, so that the lifting mechanism can adapt to the situation the height of lifting is great and the load of lifting is heavy. Also disclosed are a tower crane with the lifting mechanism and a method for leveling the lifting mechanism.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tower crane, and more particularly to a tower crane, a hoisting mechanism thereof, and a leveling method of the hoisting mechanism. BACKGROUND OF THE INVENTION Tower cranes are widely used material transport machines on construction sites. Most of the currently widely used tower cranes are single-hook single-drivers. Generally, a reel is driven by a set of drive mechanisms, such as a geared motor and a brake device. The hoisting weight is small and the capacity of the rope is low. When the drive mechanism appears In the event of a failure, not only does it require immediate downtime, but it may also require additional power equipment to lift the accessories for repair. When lifting heavy objects, it is necessary to configure a larger driving mechanism, which is not conducive to improving the versatility of the product. The existing single-drive hoisting mechanism mainly includes two types of hoisting mechanisms of "L" type arrangement and hoisting mechanisms of "Π" type arrangement. Wherein, in the hoisting mechanism of the "L" type arrangement, the axis of the reel is at an angle of 90° to the axis of the driving mechanism, so as to avoid interference between the driving mechanism and the reel, the diameter of the reel can be made large, and the volume becomes large and short. However, since the motor, reducer, brake and main beam are all on the same side of the drive mechanism, if the reel is centered, the unilateral load on the balance arm of the crane is more serious, which is unfavorable for the balance arm. Because of the height of the tower and the length of the arm, it is easy to lose stability if it is not properly operated. For the large tower crane, the weight of the motor, reducer, brake and main beam is very heavy, so the situation is more serious. At the same time, it is limited by the structure, the amount of the rope is small, and it is difficult to exceed 1400 meters. It is not satisfactory for the case of high lifting height and heavy lifting. For the hoisting mechanism of the "Π" type arrangement, due to the structure limitation, the capacity of the rope is difficult to exceed 500 meters. At present, in the field, in the hoisting mechanism of the tower crane, a hoisting mechanism of a "one" type arrangement, a hoisting mechanism of a "U" type arrangement, and the like are also appeared. For the "one" type hoisting mechanism, because the motor, reducer, brake and reel are in a straight line, the total length is long. For large tower cranes, it is generally limited by the width of the balance arm. This structure is used as the main lifting structure. The lifting mechanism of the "U" type is also called a double-drive hoisting mechanism because it is also driven by two motors and a speed reducer. The structure is as shown in Fig. 1, including the first driving mechanism 11, The second drive mechanism 21 and the reel 2, wherein the first drive mechanism 11 may include a first motor 111', a first brake 112' and a first reducer 113' that are sequentially connected, and the second drive mechanism 21' may include a The second connected second motor 211', the second brake 212' and the second reduction gear 213', the first reduction gear 113' and the second reduction gear 213' are all connected to the reel 2', the first drive mechanism 1 The two drive mechanisms 2'' and the reel 2' form a "U" shape. The biggest advantage is that when one of the motors or reducer fails, the mechanism still works normally. At this time, the hoisting weight of the mechanism is 50% of the rated hoisting weight; the disadvantages are: the same structural limitation, the capacity of the rope is difficult to exceed 1400 meters; when the mechanism has only one motor, the other one becomes a kind The load, therefore, the mechanism transmission efficiency is relatively low. The hoisting mechanism of the type arrangement and the hoisting mechanism of the "U" type arrangement can solve the defect that the single-drive hoisting mechanism is unbalanced with respect to the balance arm, but the hoisting weight and the capacity of the rope are still low. SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to provide a hoisting mechanism for a tower crane having a large hoisting weight and a high capacity. Another technical problem to be solved by the present invention is to provide a hoisting mechanism for a tower crane that is balanced with respect to a balance arm of a tower crane. Still another technical problem to be solved by the present invention is to provide a hoisting mechanism for a double-drive, double-reel, and reliably levelable tower crane. Still another technical problem to be solved by the present invention is to provide a leveling method for the above hoisting mechanism. In order to solve the above technical problem, according to an aspect of the invention, a hoisting mechanism is provided, comprising: a first lifting unit including a first driving mechanism and a first reel, the first driving mechanism driving the rotation of the first reel a second lifting unit, comprising a second driving mechanism and a second reel, wherein the second driving mechanism drives the rotation of the second reel; the lifting assembly has a hook beam and a hook disposed under the hook beam, wherein a first rope on the first reel extends from the first reel and is connected to one end of the hook beam; a second rope on the second reel extends from the second reel and is connected to the other end of the hook beam . Further, the first lifting unit further includes a first reversing pulley and a first pulley block, which are sequentially disposed between the first reel and the lifting assembly, and the first rope sequentially passes through the first reversing pulley and the first pulley block; The two lift units further include a second diverting pulley and a second pulley block, which are sequentially disposed between the second reel and the hoisting assembly, and the second rope sequentially passes through the second reversing pulley and the second pulley block. Further, the first lifting unit is configured as an L-shaped structure, wherein the first driving mechanism is vertically connected to the first reel axis, and the second lifting unit is configured as an L-shaped structure, wherein the second driving mechanism and the second reel axis Vertically connected; the first drive mechanism and the second drive mechanism are disposed in parallel with each other, and the first reel and the second reel are both located between the first drive mechanism and the second drive mechanism. Further, the first reel is located on the rear side of the second reel facing the lifting assembly, the first driving mechanism extends forward from the side of the first reel to the side of the second reel, and the second driving mechanism is from the second reel The sides of the barrel extend rearward to the side of the first roll. Further, the first driving mechanism includes a first motor, a first brake, and a first speed reducer that are sequentially connected; the second driving mechanism includes a second motor, a second brake, and a second speed reducer that are sequentially connected. Further, the hoisting mechanism is provided with a control unit that controls the first drive mechanism to drive the first reel and the second drive mechanism to drive the synchronous rotation of the second reel so that the hook beam remains horizontal. Further, the first detecting unit further includes a level detecting device, which is disposed on the hook beam to sense the levelness of the hook beam and form a level signal; the control unit controls the level signal The first drive mechanism and the second drive mechanism, in turn, control the rotational speeds of the first reel and the second reel. Further, the first detecting unit further includes: a wireless transmitting module, located near the horizontal detector, and emitting a level signal formed by the level detector; the wireless receiving module being located near the control unit, receiving the level signal, and transmitting the level signal To the control unit. Further, the second detecting unit further includes: two sensing blocks respectively disposed on the respective reversing pulleys; and two proximity switches respectively disposed on the frame supporting the reversing pulleys, and the sensing Block matching setting to sense the running speed of the reverse pulley and form a corresponding pulse signal; the control unit controls the first driving mechanism and the second driving mechanism through the level signal or the pulse signal, thereby controlling the first reel and the second The speed of the reel. Further, the third detecting unit further includes: a level indicating pin disposed on the hook beam to indicate the level of the hook beam. According to an aspect of the invention, there is provided a crane comprising any of the above hoisting mechanisms. According to still another aspect of the present invention, a leveling method for the above hoisting mechanism is provided, comprising: receiving a level signal of a hook beam detected by a level detector, and receiving a proximity switch provided on a reversing pulley; A pulse signal indicating the rotation speed of the reversing pulley; controlling the rotation speeds of the two reels connected to both ends of the hook beam by the sling and the pulse signal according to the level signal or the pulse signal to adjust the level of the hook beam. Further, the step of controlling the rotation speed of the two reels according to the level signal to adjust the level of the hook beam comprises: verifying the level signal data to determine whether the level signal is correct; if the level signal is verified correctly, The speed of the two reels is controlled according to the level signal to adjust the level of the hook beam; if the level signal is not verified correctly, the rotation speed of the two reels is controlled according to the pulse signal to adjust the level of the hook beam . Further, the step of receiving the level signal of the hook beam detected by the level detector comprises: transmitting a level signal formed by the level detector using the wireless transmitting module; receiving the level signal using the wireless receiving module, and using the level signal Transfer to the control unit. The invention has the following beneficial effects: 1. The lifting mechanism of the invention comprises two sets of lifting units, each lifting unit comprises a driving mechanism and a reel, and two sets of ropes on the two reels are respectively connected and suspended. One end of the hook beam, which greatly increases the hoisting capacity of the hoisting mechanism, increases the capacity of the hoisting rope, and can adapt to the situation of high lifting height and heavy lifting. In addition, when a lifting unit fails to be repaired, the hook beam and the pulley block in the lifting unit are removed, and the other lifting unit can still work without affecting the use of the tower crane. 2. In the hoisting mechanism of the present invention, both lifting units can be arranged in an L-shaped structure, and in each lifting unit, the reel and the driving mechanism are vertically connected, and the two driving mechanisms are arranged in parallel, two reels Located between the two drive mechanisms, and more preferably, the first drive mechanism can be extended rearward from the side of the first reel to the side of the second reel, the second drive mechanism being rearward from the side of the second reel Extending to the side of the first reel, this creates a symmetrical structure that aligns the entire hoisting mechanism with respect to the balance arm, making the tower crane more stable. 3. The hoisting mechanism of the present invention may further comprise a level detector, which may preferably transmit the level signal using the wireless transmitting module and the wireless receiving module, and more preferably may further comprise an inductive block and a proximity switch. The detecting unit is used for detecting the rope feeding speed of the two reels, and the two signals are used to detect the horizontality of the hook beam, and then the rotation speed of the two driving mechanisms is controlled according to the level of the hook beam to make the hook beam maintain standard. 4. The leveling method of the hoisting mechanism of the present invention simultaneously receives the level signal and the pulse signal, and can be leveled by using the pulse signal when the level signal is verified to have an error, thereby realizing a reliable leveling of the hoisting mechanism. . In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The invention will now be described in further detail with reference to the drawings. The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the invention. 1 is a top plan view of a hoisting mechanism according to a prior art "U" type arrangement; FIG. 2 is a top plan view of a hoisting mechanism according to a first embodiment of the present invention; Figure 3 is a front view of a hoisting mechanism according to a first embodiment of the present invention; Figure 4 is a schematic view showing the structure of a tower crane according to a first embodiment of the present invention; Schematic diagram of the hook beam and the first detecting unit and the third detecting unit in the hoisting mechanism of the first embodiment; FIG. 6 is a second detecting unit of the hoisting mechanism according to the first embodiment of the present invention; schematic diagram. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention are described in detail below with reference to the accompanying drawings. As shown in FIG. 2, FIG. 3 and FIG. 4, the hoisting mechanism of the present invention includes a first hoisting unit and a second hoisting unit, and the first hoisting unit includes a first driving mechanism 11 and a first reel 12, A drive mechanism 11 drives the rotation of the first reel 12; the second hoisting unit includes a second drive mechanism 21 and a second reel 22, and the second drive mechanism 21 drives the rotation of the second reel 22. In addition, as shown in FIGS. 4 and 5, the lifting assembly has a hook beam 4 and a hook disposed below the hook beam 4. As can be seen from Figures 3 and 4, the first rope 31 on the first reel 12 extends from the first reel 12 and is connected to one end of the hook beam 4; the second rope on the second reel 22 32 extends from the second reel 22 and is coupled to the other end of the hook beam 4. It can be understood that the structure of the two sets of lifting units makes the hoisting capacity of the hoisting mechanism greatly increased, the capacity of the hoisting rope is increased, and the lifting of the existing single-drive hoisting mechanism and the existing "Π" type arrangement. Compared with the hoisting mechanism of the "u" type arrangement, since the driving mechanism and the reel are both sets, it is possible to adapt to the situation of high lifting height and heavy lifting. Specifically, since two independent lifting units drive the two ropes, and then the two ropes respectively pull the two ends of the hook through the hook beam 4, each set only bears the rated lifting weight of the tower crane. Half of the time, therefore, for the whole machine, its capacity and hoisting capacity have doubled on the basis of the original "L" type mechanism. In addition, when a lifting unit fails to be repaired, the hook beam and the pulley block in the lifting unit are removed, and the other lifting unit can still work without affecting the tower crane. use. In the present embodiment, as shown in FIGS. 3 and 4, the first lifting unit further includes a first diverting pulley 13 and a first pulley block 14, which are sequentially disposed between the first reel 12 and the lifting assembly, and similarly The second hoisting unit further includes a second reversing pulley 23 and a second pulley block 24, which are sequentially disposed between the second reel 22 and the hoisting assembly. The first rope 31 sequentially passes through the first reversing pulley 13 and the first pulley block 14; likewise, the second rope 32 sequentially passes through the second reversing pulley 23 and the second pulley block 24. Preferably, as shown in FIG. 2, the two lifting units may be configured as follows: The first lifting unit is configured as an L-shaped structure, wherein the first driving mechanism 11 and the first reel 12 are vertically connected, the second The liter unit is configured as an L-shaped structure in which the second drive mechanism 21 and the second reel 22 are vertically connected; the first drive mechanism 11 and the second drive mechanism 21 are disposed in parallel with each other, the first reel 12 and the second reel The cartridges 22 are each located between the first drive mechanism 11 and the second drive mechanism 21. This will form a symmetrical structure, so that the entire hoisting mechanism is symmetrical with respect to the balance arm 8 (as shown in FIG. 4), thereby making the tower crane more stable, and avoiding the single-drive hoisting mechanism of the prior art easily leading to the entire crane. The problem of instability. More preferably, in the present embodiment, as can be seen in the top view of FIG. 2, the first reel 12 is located on the rear side of the second reel 22 facing the hoisting assembly, and the first drive mechanism 11 is from the first reel 12 The side faces extend forward to the side of the second reel 22, and the second drive mechanism 21 extends rearward from the side of the second reel 22 to the side of the first reel 12. In this way, the two lifting units enclose a very compact and symmetrical structure, making the tower crane more stable. Preferably, the first drive mechanism 11 includes a first motor 111, a first brake 112, and a first speed reducer 113 that are sequentially connected; the second drive mechanism 21 includes a second motor 211, a second brake 212, and a second, which are sequentially connected. Two reducer 213. The first reducer 113 is connected to the first reel 12, and the second reduction gear is connected to the second reel 22. However, the structure of the double-drive double reel tends to be inclined when lifting heavy objects, so it is necessary to ensure that the linear speeds of the ropes on the two independent reels are the same, that is, the first reel 12 and the second reel are to be secured. 22 synchronously rotate to ensure the level of the hook beam 4, otherwise, it will cause the safety hazard of the sling hook to occur in the relative horizontal position during the operation of the hook. In the present embodiment, preferably, the hoisting mechanism is provided with a control unit that controls the first driving mechanism 11 to drive the first reel 12 and the second driving mechanism 21 to drive the synchronous rotation of the second reel 22, so that the hook beam 4 maintain standard. More preferably, as shown in FIG. 5, the hoisting mechanism according to the first embodiment of the present invention further includes a first detecting unit 5, which includes a level detector 51, which is disposed on the hook beam 4, For sensing the levelness of the hook beam 4 and forming a level signal; the above control unit controls the first driving mechanism 11 and the second driving mechanism 21 according to the level signal sent by the level detector 51, specifically, In the present embodiment, in order to control the rotational speeds of the first motor 111 and the second motor 211, the rotational speeds of the first reel 11 and the second reel 21 are controlled. That is, by the electronic control program setting, when it is determined according to the level signal that the retracting amount error of the two ropes exceeds the allowable value of the hook group deflection, the electronic control system adjusts the first motor 111 and the second motor 211 by adjusting The speed is used to compensate for the accumulated error of the original two ropes, so that the hook returns to the horizontal state. Therefore, the hook is always in a "dynamic" equilibrium state during the movement. Since the transmission of the tilt angle data (ie, the level signal) through the cable not only makes the reasonable wiring extremely difficult, the long-distance transmission also greatly attenuates the sensor signal, thereby causing a major safety hazard. Therefore, in the embodiment, the first detecting unit 5 further includes: a wireless transmitting module and a wireless receiving module (not shown), wherein the wireless transmitting module is located near the level detector, and the level detector is formed. The level signal is sent; and the wireless receiving module is located near the control unit, receives the level signal, and transmits the level signal to the control unit. In this way, wiring is eliminated, and the defect of signal attenuation in cable transmission is avoided. However, when the wireless transmission is too long (200m or more) and the signal is disturbed, data loss, distortion, etc. may occur. Sometimes the level detector 51 may be due to its own reasons (such as its own fault, battery exhaustion, etc.) It is impossible to detect the level and signal. At this time, preferably, in the embodiment, the second detecting unit 7 is further disposed in the hoisting mechanism. As shown in FIG. 6, the second detecting unit 7 includes: a first sensing block 71 and a first proximity switch. 73 and a second sensing block 72 and a second proximity switch 74. The first sensing block 71 and the second sensing block 72 are respectively disposed on the first reversing pulley 13 and the second reversing pulley 23; the first proximity switch 73 and the second proximity switch 74 are respectively disposed to support the first commutation The frame of the pulley 13 and the second reversing pulley 23 are arranged in cooperation with the two sensing blocks to sense the running speed of the reversing pulley and form a corresponding pulse signal, that is, two proximity switches respectively form two A set of pulse signals indicating the speeds of the first rope 31 and the second rope 32, respectively. The control unit may control the first drive mechanism 11 and the second drive mechanism 21 by a level signal or a pulse signal, thereby controlling the rotational speeds of the first reel 11 and the second reel 21. Specifically, the control unit may be based on the leveling manner of the wireless transmission level signal described above, supplemented by the proximity switch pulse leveling method described herein. The level detector 51 directly obtains the information of the current horizontal condition of the hook, and wirelessly transmits the level signal to the control unit (for example, the main control plc), and simultaneously calibrates the data of the pulse leveling, for example, by the master PLC. Check to determine if the data is reliable. When the wireless data transmission is distorted by external interference data, frame loss, etc., that is, due to distance, interference and other factors, the main control PLC cannot receive valid data within a certain time (can be set), according to the last modified proximity switch. The data is used for pulse leveling. When the effective level signal data is received again, that is, the level signal of the leveling mode of the wireless transmission level signal is recovered, the tone signal of the wireless transmission is continuously used. Flat way. In this way, the advantages of the measurement data of the wireless leveling system and the stability of the data by the pulse leveling method are utilized, which effectively compensates for the gap between the data loss caused by the wireless leveling system when the data is interfered, and greatly improves the double hook lifting. The accuracy, safety and reliability of the hook leveling during the use of the crane. More preferably, as shown in FIG. 5, in the embodiment, the hoisting mechanism further includes a third detecting unit 6, and the third detecting unit 6 includes a level indicating pin disposed on the hook beam for indicating the hook The level of the beam. when When the horizontal signal and the pulse signal are not received due to special reasons, the operator can manually intervene the two driving mechanisms by visually checking the horizontal indicating needle to restore the hook to the horizontal state. As can be understood from the above, the present invention also provides a tower crane provided with any of the hoisting mechanisms described above, whereby the hoisting capacity of the tower crane is greatly increased, and the capacity of the tower crane is increased. Increase, can adapt to the situation of high lifting height and heavy lifting. The entire tower crane is more balanced and stable. In addition, it can be understood from the above that the present invention also provides a leveling method for the above hoisting mechanism, the method comprising: receiving a level signal of the hook beam detected by the level detector, and receiving the setting on the reversing pulley a pulse signal indicating the rotation speed of the reverse pulley detected by the proximity switch; controlling the rotation speeds of the two reels connected to the two ends of the hook beam respectively through the sling rope according to the level signal or the pulse signal to adjust the hook beam Level. The method ensures that the linear speeds of the ropes on the two separate reels are consistent, thereby ensuring the level of the hook beam 4, and avoiding the safety hazard of the sling hooks when the hooks are not in a relatively horizontal position during operation. Preferably, controlling the rotation speeds of the two reels connected by the slings and the two ends of the hook beam respectively according to the level signal and the pulse signal to adjust the level of the hook beam comprises: verifying the level signal data, Determine whether the level signal is correct; if the level signal is verified correctly, control the speed of the two reels according to the level signal to adjust the level of the hook beam; if the level signal is not verified correctly, according to the pulse The signal controls the speed of the two reels to adjust the level of the hook beam. More preferably, the step of receiving the level signal of the hook beam detected by the level detector comprises: transmitting a level signal formed by the level detector using the wireless transmitting module; receiving the level signal using the wireless receiving module, and leveling the level The signal is transmitted to the control unit. In addition, when the level signal and the pulse signal are not received due to special reasons, the operator can manually intervene the two driving mechanisms by visually checking the level indicating needle to restore the hook to the horizontal state. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A hoisting mechanism, comprising:

a first lifting unit comprising a first driving mechanism (11) and a first reel (12), the first driving mechanism (11) driving rotation of the first reel (12);

a second lifting unit comprising a second driving mechanism (21) and a second reel (22), the second driving mechanism (21) driving the rotation of the second reel (22);

a lifting assembly having a hook beam (4) and a hook disposed below the hook beam (4), wherein

a first rope (31) on the first reel (12) extending from the first reel (12) and connected to one end of the hook beam (4);

A second cord (32) on the second reel (22) extends from the second reel (22) and is coupled to the other end of the hook beam (4).

2. The hoisting mechanism according to claim 1, wherein

The first hoisting unit further includes a first reversing pulley (13) and a first pulley block (14) disposed in sequence between the first reel (12) and the lifting assembly, the first rope (31) sequentially passing the first reversing pulley (13) and the first pulley block (14);

The second hoisting unit further includes a second reversing pulley (23) and a second pulley block (24), which are sequentially disposed between the second reel (22) and the lifting assembly, the second The rope (32) passes sequentially through the second diverting pulley (23) and the second pulley block (24).

3. The hoisting mechanism according to claim 1, wherein

The first lifting unit is configured as an L-shaped structure, wherein the first driving mechanism (11) and the first reel (12) are vertically connected to each other,

The second hoisting unit is configured as an L-shaped structure, wherein the second driving mechanism (21) and the second reel (22) are vertically connected to each other;

The first drive mechanism (11) and the second drive mechanism (21) are disposed in parallel with each other, and the first reel (12) and the second reel (22) are both located at the first drive Between the mechanism (11) and the second drive mechanism (21).

4. The hoisting mechanism according to claim 3, wherein the first reel (12) is located on a rear side of the second reel (22) facing the hoisting assembly, the first a driving mechanism (11) extending forward from a side of the first reel (12) to a side of the second reel (22), the second driving mechanism

(21) extending rearward from the side of the second reel (22) to the side of the first reel (12).

5. The hoisting mechanism according to claim 1, wherein

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 reducer (213) that are sequentially connected.

6. The hoisting mechanism according to claim 1, wherein the hoisting mechanism is provided with a control unit that controls the first driving mechanism (11) to drive the first reel (12) and the The second drive mechanism (21) drives the synchronous rotation of the second reel (22) such that the hook beam (4) remains horizontal.

7. The hoisting mechanism according to claim 6, wherein

Further comprising a first detecting unit (5), the first detecting unit (5) comprising a level detector (51) disposed on the hook beam (4) for sensing the hook beam (4) Level and form a level signal;

The control unit controls the first drive mechanism (11) and the second drive mechanism (21) by the level signal, thereby controlling the first reel (11) and the second reel ( 21) The speed.

The hoisting mechanism according to claim 7, wherein the first detecting unit (5) further comprises:

a wireless transmitting module, located near the level detector, and transmitting the level signal formed by the level detector;

The wireless receiving module is located near the control unit, receives the level signal, and transmits the level signal to the control unit.

9. The hoisting mechanism according to claim 7, wherein

Also included is a second detecting unit (7), the second detecting unit (7) comprising:

Two sensing blocks are respectively disposed on each of the reversing pulleys;

Two proximity switches are respectively disposed on the frame body supporting each of the reversing pulleys, and are disposed in cooperation with the sensing block to sense the running speed of the reversing pulley and form a corresponding pulse signal; The control unit controls the first drive mechanism (11) and the second drive mechanism (21) by the level signal or the pulse signal, thereby controlling the first reel (11) and the The speed of the second reel (21).

10. The hoisting mechanism according to claim 6, further comprising a third detecting unit (6), wherein the third detecting unit (6) comprises: a level indicating pin disposed on the hook beam Above, used to indicate the levelness of the hook beam.

A tower crane, comprising the hoisting mechanism according to any one of claims 1-10.

12. The method for leveling a hoisting mechanism according to claim 9, comprising: receiving a level signal of the hook beam detected by the level detector, and simultaneously receiving a proximity switch disposed on the reverse pulley Detecting a pulse signal indicating the rotational speed of the reverse pulley;

The rotation speeds of the two reels connected to the both ends of the hook beam by the slings are respectively controlled according to the level signal or the pulse signal to adjust the level of the hook beam.

13. The method according to claim 12, wherein the step of controlling the rotational speed of the two reels according to the level signal to adjust the level of the hook beam comprises:

Verifying the levelness signal data to determine whether the level signal is correct; if the level signal is verified correctly, controlling the rotation speed of the two reels according to the level signal to adjust the hook beam s level;

If the level signal is incorrectly verified, the speed of the two reels is controlled according to the pulse signal to adjust the level of the hook beam.

14. The method according to claim 13, wherein the step of receiving the level signal of the hook beam detected by the level detector comprises:

The level signal formed by the level detector is sent using a wireless transmitting module; the level signal is received using a wireless receiving module, and the level signal is transmitted to a control unit.