A crane for construction work

Abstract

The present application relates to the technical field of crane, in particular to a crane for building construction, including the lifting arm, the lifting arm is provided with the sliding frame which slides horizontally, the inside of the sliding frame is provided with the electric hoist, the steel wire rope is wound on the electric hoist, the end of the steel wire rope away from the electric hoist is hoisted with the construction material;The inside of the sliding frame is also provided with the winding drum which can move relative to the sliding frame, the sliding direction of the sliding frame is set as the front and back direction, the axis of the winding drum extends along the left and right direction, the middle part of the steel wire rope is wound over the winding drum, the left and right sides of the winding drum are both provided with the moving arm mechanism, two moving arm mechanisms act synchronously, two moving arm mechanisms can drive the winding drum to move backward and upward when the steel wire rope swings backward, so that the steel wire rope becomes vertical state, and then promotes the construction material to stop swinging.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cranes, in particular to a crane for construction. BACKGROUND

[0002] In the construction, due to the large volume and heavy weight of construction materials, a crane is usually used in the construction site to hoist and move the construction materials.

[0003] However, when the existing crane stops hoisting and moving, the hoisted heavy object will swing back and forth several times due to inertia until it automatically stops under the action of friction resistance. This long time can easily cause the steel wire rope to break, thereby affecting the hoisting stability. SUMMARY

[0004] Therefore, it is necessary to provide a crane for construction to solve the technical problem that the existing crane is easy to cause the steel wire rope to break.

[0005] The above-mentioned purpose is achieved by the following technical scheme:

[0006] A crane for construction, comprising a hoisting arm, a sliding frame horizontally sliding on the hoisting arm, an electric hoist arranged in the sliding frame, a steel wire rope wound on the electric hoist, and a construction material hoisted by the end of the steel wire rope away from the electric hoist; a winding drum capable of moving relative to the sliding frame is further arranged in the sliding frame, the sliding direction of the sliding frame is set as the front-back direction, the axis of the winding drum extends along the left-right direction, the middle part of the steel wire rope is wound over the winding drum, and a moving arm mechanism is arranged on the left and right sides of the winding drum, the two moving arm mechanisms act synchronously, and when the steel wire rope swings back, the two moving arm mechanisms drive the winding drum to move upward and backward, so as to make the steel wire rope tend to be vertical, and further promote the construction material to stop swinging.

[0007] Further, the moving arm mechanism comprises a first gear coaxially arranged on the winding drum, a middle gear arranged at the rear of the first gear, a second gear arranged at the rear of the middle gear, a connecting arm fixedly connected with the second gear, and a connecting rod connected with the connecting arms of the second gears of the two moving arm mechanisms, wherein the connecting rod extends along the left-right direction, the sliding frame is provided with an arc-shaped slot, the axis of the arc-shaped slot coincides with the axis of the first gear, the end of the connecting rod can slide along the arc-shaped slot, the first gear, the middle gear and the second gear are jointly connected with a triangular frame, the inside of the winding drum is provided with a driving mechanism capable of driving the first gear to rotate, and the moving arm mechanism has a first working state and a second working state.

[0008] Further, the triangular frame is provided with a first rotation shaft, a second rotation shaft and a third rotation shaft, the first gear is arranged on the first rotation shaft, the middle gear is arranged on the second rotation shaft, and the second gear is arranged on the third rotation shaft, the first rotation shaft is provided with an extension shaft, the extension shaft can make the triangular frame rotate with the sliding frame when extended, and the extension shaft can make the triangular frame disengage from the sliding frame when retracted.

[0009] Further, the second rotation shaft is provided with an extension block, the extension block extends along the radial direction of the second rotation shaft, the middle gear is provided with a rotation slot, the rotation slot rotates with the second rotation shaft, the rotation slot is provided with a limiting slot, and the extension block can enter the limiting slot when extended, so as to limit the rotation of the middle gear relative to the triangular frame.

[0010] Further, the left and right ends of the connecting rod are provided with extension teeth, and the inner wall of the arc-shaped slot is provided with limiting teeth; when the extension teeth extend from the ends of the connecting rod, the extension teeth can engage with the limiting teeth, so as to limit the connecting rod in the arc-shaped slot; when the extension teeth retract into the ends of the connecting rod, the ends of the connecting rod can slide along the arc-shaped slot.

[0011] Further, the winding drum is provided with a pressing area and a sensing area, the pressing area is located in the upper half of the winding drum and occupies one half of the outer circumferential surface of the winding drum, and the sensing area is located in the lower and forward part of the winding drum and occupies one fourth of the outer circumferential surface of the winding drum.

[0012] Furthermore, the pressing area is provided with a pressing ring, which is an arc-shaped ring. A return spring is provided between the pressing ring and the winding drum. The return spring facilitates the reset of the pressing ring. A first pressure sensor is provided between the return spring and the winding drum.

[0013] Furthermore, the sensing area includes multiple sensing strips evenly distributed around the axis of the winding drum, and the sensing strips are connected to a second pressure sensor, which can detect the oscillating pressure of the wire rope on the sensing strips.

[0014] Furthermore, the first rotation angle is related to the maximum angle at which the wire rope swings backward.

[0015] Furthermore, a steering wheel is provided between the electric hoist and the winding drum, and the steering wheel is used to change the direction of the wire rope.

[0016] The beneficial effects of this invention are:

[0017] The crane for construction provided by this invention has a moving boom mechanism that can change the position of the swing center of the wire rope, causing the swinging wire rope to tend to be vertical, so that the construction material can stop swinging as soon as possible, avoid the wire rope from breaking due to repeated swinging, and extend the service life of the crane used for construction. Attached Figure Description

[0018] Figure 1 A three-dimensional structural schematic diagram of a crane used for building construction provided in an embodiment of the present invention;

[0019] Figure 2 This is a partial structural schematic diagram of a crane used for building construction provided in an embodiment of the present invention;

[0020] Figure 3 A side view of a crane used for building construction according to an embodiment of the present invention;

[0021] Figure 4 for Figure 3 Sectional view of AA;

[0022] Figure 5 for Figure 3 BB section view;

[0023] Figure 6 for Figure 3 CC section view;

[0024] Figure 7 for Figure 2 The main view;

[0025] Figure 8 for Figure 7 DD section view;

[0026] Figure 9 A schematic view of a partial structure of a crane for construction provided by an embodiment of the present application;

[0027] Figure 10 A schematic view of a structure of a mobile arm mechanism in a crane for construction provided by an embodiment of the present application;

[0028] Figure 11 A Figure 10 An enlarged view of a structure at E in the middle;

[0029] Figure 12 Another schematic view of a mobile arm mechanism in a crane for construction provided by an embodiment of the present application.

[0030] Wherein:

[0031] 100, base; 101, crane arm; 102, sliding frame; 103, electric hoist; 104, arc-shaped slot; 1041, limiting tooth; 105, steel wire rope; 200, construction material; 300, mobile arm mechanism; 301, second gear; 302, telescopic tooth; 303, intermediate gear; 304, first gear; 305, triangular frame; 3051, first rotating shaft; 30511, telescopic shaft; 3052, second rotating shaft; 30521, telescopic block; 3053, third rotating shaft; 306, connecting rod; 307, winding drum; 308, pressing area; 309, sensing area; 310, driving motor; 311, steering wheel. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application by means of embodiments and in conjunction with the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0033] The serial numbers of components in the present application, such as “first”, “second”, etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. The “connection” and “coupling” in the present application include direct and indirect connection (coupling) unless otherwise specified. In the description of the present application, it should be understood that the terms “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, etc. indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "over", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower than the second feature in horizontal height.

[0035] As Figures 1 to 12 shown, an embodiment of the present application provides a crane for building construction, comprising a base 100, a lifting arm 101 is arranged on the base 100 through a support column, a sliding frame 102 is horizontally slidably arranged on the lifting arm 101, the sliding frame 102 is a U-shaped plate structure, a sliding block is arranged at the top of the sliding frame 102, the sliding block is in sliding cooperation with a sliding rail on the lifting arm 101, an electric hoist 103 is arranged in the sliding frame 102, a steel wire rope 105 is wound on the electric hoist 103, and a construction material 200 is hung at one end of the steel wire rope 105 away from the electric hoist 103; a winding drum 307 capable of moving relative to the sliding frame 102 is further arranged in the sliding frame 102, the sliding direction of the sliding frame 102 is set as the front-back direction, the axis of the winding drum 307 extends along the left-right direction, the middle part of the steel wire rope 105 is wound over the winding drum 307, and a moving arm mechanism 300 is arranged on the left and right sides of the winding drum 307, the two moving arm mechanisms 300 act synchronously, and the two moving arm mechanisms 300 can drive the winding drum 307 to move upward and backward when the steel wire rope 105 swings backward, so as to make the steel wire rope 105 tend to be vertical, and further promote the construction material 200 to stop swinging. Wherein, a wire pressing wheel (not shown in the figure) is arranged on the winding drum 307, the wire pressing wheel is in sliding contact with the steel wire rope 105 and the winding drum 307, so as to avoid the separation of the two.

[0036] In this way, the moving arm mechanism 300 can change the position of the swing center of the steel wire rope 105, make the steel wire rope 105 which is swinging forward and backward tend to be vertical, make the construction material 200 stop swinging as soon as possible, avoid the breakage of the steel wire rope 105 caused by multiple swings, and prolong the service life of the crane for building construction.

[0037] Further, the moving arm mechanism 300 comprises a first gear 304 coaxially arranged on the winding drum 307, a middle gear 303 is arranged at the back of the first gear 304, a second gear 301 is arranged at the back of the middle gear 303, a connecting arm is fixedly connected to the second gear 301, the connecting arms of the second gears 301 of the two moving arm mechanisms 300 are jointly connected to a same connecting rod 306, the connecting rod 306 extends along the left-right direction, the sliding frame 102 is provided with an arc-shaped slot 104, the axis of the arc-shaped slot 104 coincides with the axis of the first gear 304, the end of the connecting rod 306 can slide along the arc-shaped slot 104, the first gear 304, the middle gear 303 and the second gear 301 are jointly rotatably connected to a triangular frame 305, and the first gear 304, the middle gear 303, the second gear 301 and the triangular frame 305 constitute the moving arm mechanism 300, and the moving arm mechanism 300 can make the connecting rod 306 and the axis of the first gear 304 always be on a straight line.

[0038] The inside of the winding drum 307 is provided with a driving mechanism, the driving mechanism can drive the first gear 304 to rotate, the moving arm mechanism 300 has a first working state and a second working state, in the first working state, the rotation of the first gear 304 synchronously drives the middle gear 303 and the second gear 301 to rotate as a whole around the rotation axis of the first gear 304 through the triangular frame 305, and in turn drives the connecting rod 306 to rotate a first rotation angle in the arc-shaped slot 104, in the second working state, the rotation of the first gear 304 drives the middle gear 303 and the second gear 301 to rotate in turn through gear transmission, so that the triangular frame 305 rotates, and at the same time, the first gear 304 moves linearly towards the connecting rod 306, and the straight line is perpendicular to the axis of the connecting rod 306. The driving structure is a driving motor 310, and the output shaft of the driving motor 310 is connected with the first gear 304.

[0039] In this way, when the swinging steel wire rope 105 is adjusted, the moving arm mechanism 300 is first in the first working state, so that the first gear 304, the middle gear 303 and the second gear 301 rotate as a whole, so that the connecting rod 306 rotates a first rotation angle in the arc-shaped slot 104, and then the moving arm mechanism 300 is in the second working state, so that the first gear 304 moves linearly towards the connecting rod 306, so that the first gear 304 drives the winding drum 307 to move upwards and backwards, so that the steel wire rope 105 becomes vertical.

[0040] Further, the triangular frame 305 is provided with a first rotating shaft 3051, a second rotating shaft 3052 and a third rotating shaft 3053, the first gear 304 is rotatably arranged on the first rotating shaft 3051, the intermediate gear 303 is rotatably arranged on the second rotating shaft 3052, and the second gear 301 is rotatably arranged on the third rotating shaft 3053. The first rotating shaft 3051 is provided with an extension shaft 30511, which can be in rotational cooperation with the triangular frame 305 and the sliding frame 102 when extended, and can be out of cooperation with the triangular frame 305 and the sliding frame 102 when retracted. When the moving arm mechanism 300 is in the first working state, the extension shaft 30511 is extended so that the triangular frame 305 is in rotational cooperation with the sliding frame 102, and thus the first gear 304 cannot move relative to the sliding frame 102 when rotating; when the moving arm mechanism 300 is in the second working state, the extension shaft 30511 is retracted so that the first gear 304 can move relative to the sliding frame 102 when rotating.

[0041] Further, the second rotating shaft 3052 is provided with an extension block 30521 which can extend and retract along the radial direction of the second rotating shaft 3052. The intermediate gear 303 is provided with a rotating groove which is in rotational cooperation with the second rotating shaft 3052. The rotating groove is provided with a limiting groove (not shown in the figure). The extension block 30521 can enter the limiting groove when extended, thereby limiting the rotation of the intermediate gear 303 relative to the triangular frame 305.

[0042] When the moving arm mechanism 300 is in the first working state, the extension block 30521 cooperates with the limiting groove, and thus the intermediate gear 303 is relatively fixed with the triangular frame 305, so that the first gear 304 can drive the intermediate gear 303, the second gear 301 and the connecting rod 306 to rotate as a whole around the rotating shaft of the first gear 304.

[0043] Further, the left and right ends of the connecting rod 306 are provided with extension teeth 302, and the inner wall of the arc-shaped groove 104 is provided with limiting teeth 1041. When the extension teeth 302 extend from the ends of the connecting rod 306, the extension teeth 302 can engage with the limiting teeth 1041, thereby limiting the connecting rod 306 in the arc-shaped groove 104. When the extension teeth 302 retract into the ends of the connecting rod 306, the ends of the connecting rod 306 can slide along the arc-shaped groove 104. By arranging the extension teeth 302 and the limiting teeth 1041, the connecting rod 306 can be locked at the first rotating angle when the connecting rod 306 swings to the first rotating angle.

[0044] Further, the winding drum 307 is provided with a pressing area 308 and a sensing area 309. The pressing area 308 is located at the upper half of the winding drum 307 and occupies one half of the outer circumferential surface of the winding drum 307. The sensing area 309 is located at the lower and forward part of the winding drum 307 and occupies one fourth of the outer circumferential surface of the winding drum 307.

[0045] Since the steel wire rope 105 passes above the winding drum 307, it can only contact the upper half of the winding drum 307. During the forward and backward swinging of the steel wire rope 105, it can only contact the lower and forward part of the winding drum 307. Therefore, the pressing and swinging of the steel wire rope 105 can be detected more easily by such arrangement.

[0046] Further, the pressing area 308 is provided with a pressing ring. The pressing ring is an arc-shaped ring. A reset spring is arranged between the pressing ring and the winding drum 307. The reset spring facilitates the reset of the pressing ring. A first pressure sensor is arranged between the reset spring and the winding drum 307. The first pressure sensor can detect the pressure value of the steel wire rope 105 on the pressing ring. During the movement of the winding drum 307 with the first gear 304, a part of the steel wire rope 105 can be relaxed. The reset spring can tension the steel wire rope 105 to the initial state.

[0047] Further, the sensing area 309 includes a plurality of sensing bands which are uniformly distributed around the axis of the winding drum 307. The sensing bands are connected with second pressure sensors. The second pressure sensors can detect the swinging pressure of the steel wire rope 105 on the sensing bands. Since there are a plurality of sensing bands, the maximum angle of the backward swinging of the steel wire rope 105 can be obtained by judging whether the sensing bands at each position are subjected to the swinging pressure of the steel wire rope 105 through the controller.

[0048] Further, the first rotation angle is related to the maximum angle of the backward swinging of the steel wire rope 105.

[0049] Specifically, through calculation, the relationship between the first rotation angle β and the maximum angle α of the backward swinging of the steel wire rope 105 is as follows:

[0050]

[0051] Wherein, L is the length of the steel wire rope 105 in the vertical direction when hoisting the construction material 200 to a set height; and r is the radius of the first gear 304.

[0052] Further, a deflection wheel 311 is arranged between the electric hoist 103 and the winding drum 307. The deflection wheel 311 is used for the deflection of the steel wire rope 105. Since the axis of the electric hoist 103 is perpendicular to the axis of the winding drum 307, the deflection wheel 311 is arranged to deflect the steel wire rope 105.

[0053] In combination with the above embodiment, the use principle and working process of the embodiment of the present application are as follows:

[0054] In this embodiment, the hoisting height of the crane for the construction material 200 is kept unchanged each time, so that the length L of the steel wire rope 105 in the vertical direction is a fixed value.

[0055] Firstly, the controller controls the electric hoist 103 to hoist a construction material 200 first, and then controls the sliding frame 102 to slide along the hoisting arm 101 to move the construction material 200 to the designated position. When the sliding frame 102 stops moving, the construction material 200 will swing forward and backward due to inertia, and the inductive area 309 below the winding drum 307 can detect the swing pressure at this time, so that the controller can calculate the maximum swing angle a of the steel wire rope 105 backward according to the data of each second pressure sensor, and the first pressure sensor records the pressure value of the steel wire rope 105 on the pressing ring when the steel wire rope 105 is in the vertical state.

[0056] Secondly, the controller calculates the first rotation angle β according to the relationship formula between the first rotation angle β and the maximum swing angle a of the steel wire rope 105 backward.

[0057] Thirdly, the controller starts the driving motor 310 and controls the extension shaft 30511 and the extension block 30521 to be in the extended state, and the extension teeth 302 to be in the retracted state. At this time, the moving arm mechanism 300 is in the first working state, the rotation of the first gear 304 synchronously drives the intermediate gear 303 and the second gear 301 as a whole to rotate around the rotation shaft of the first gear 304, and then drives the connecting rod 306 to rotate the first rotation angle β in the arc-shaped groove 104.

[0058] Fourthly, the controller controls the extension teeth 302 at the end of the connecting rod 306 to extend, so that the extension teeth 302 engage with the limiting teeth 1041, thereby limiting the connecting rod 306 in the arc-shaped groove 104. At this time, the connecting rod 306 cannot continue to rotate in the arc-shaped groove 104, and the connecting rod 306 is kept rotating the first rotation angle β in the arc-shaped groove 104.

[0059] In the fifth step, the controller controls the telescopic shaft 30511 and the telescopic block 30521 to retract. At this time, the moving arm mechanism 300 is in the second working state, the rotation of the first gear 304 drives the intermediate gear 303 and the second gear 301 to rotate in turn through gear transmission, so that the triangular frame 305 rotates, and the first gear 304 moves linearly towards the connecting rod 306, the linear motion is perpendicular to the axis of the connecting rod 306, so that the first gear 304 drives the winding drum 307 to move upwards and backwards; wherein, the rotation of the first gear 304 synchronously drives the winding drum 307 to move, and the winding drum 307 basically does not rotate with the rotation of the first gear 304. When the first pressure sensor of the sensing area 309 detects that the pressure value returns to the initial state, it indicates that the steel wire rope 105 and the winding drum 307 return to the initial state, at this time, the driving motor 310 is stopped, the steel wire rope 105 becomes vertical, and the steel wire rope 105 can stop swinging as soon as possible.

[0060] Finally, the control of the electric hoist 103 can lower the construction material 200 to the platform at the pre-set lifting height.

[0061] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the present application.

[0062] The above embodiments only express several embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the present application. It should be pointed out that, for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A crane for use in construction, characterized in that The crane arm is provided with a sliding frame horizontally sliding thereon, the sliding frame is internally provided with an electric hoist, a steel wire rope is wound on the electric hoist, and the end of the steel wire rope away from the electric hoist is provided with a construction material; The inside of the sliding frame is further provided with a winding drum capable of moving relative to the sliding frame, the sliding direction of the sliding frame is set as the front-back direction, the axis of the winding drum extends along the left-right direction, the middle part of the steel wire rope is wound over the upper part of the winding drum, the left and right sides of the winding drum are both provided with a moving arm mechanism, the moving arm mechanism comprises a first gear coaxially rotating on the winding drum, an intermediate gear is engaged behind the first gear, a second gear is engaged behind the intermediate gear, a connecting arm is fixedly connected to the second gear, the connecting arms of the second gears of the two moving arm mechanisms are commonly connected to a same connecting rod, the connecting rod extends along the left-right direction, the sliding frame is provided with an arc-shaped groove, the axis of the arc-shaped groove coincides with the axis of the first gear, the end of the connecting rod is capable of sliding along the arc-shaped groove, the first gear, the intermediate gear and the second gear are commonly connected to a triangular frame, the triangular frame is provided with a first rotating shaft, a second rotating shaft and a third rotating shaft, the first gear is rotatably arranged on the first rotating shaft, the intermediate gear is rotatably arranged on the second rotating shaft, the second gear is rotatably arranged on the third rotating shaft, the first rotating shaft is provided with an extension shaft, the extension shaft is capable of making the triangular frame and the sliding frame rotationally fit when the extension shaft is in extension, and the extension shaft is capable of making the triangular frame and the sliding frame disengage when the extension shaft is in contraction; the second rotating shaft is provided with an extension block, the extension block extends along the radial direction of the second rotating shaft, the intermediate gear is provided with a rotating groove, the rotating groove rotationally fits the second rotating shaft, the rotating groove is provided with a limiting groove, and the extension block is capable of entering the limiting groove after extension, thereby limiting the rotation of the intermediate gear relative to the triangular frame; The inside of the winding drum is provided with a driving mechanism, the driving mechanism is capable of driving the two first gears to synchronously rotate, thereby making the two moving arm mechanisms synchronously act, when the steel wire rope swings backward, the winding drum is driven to move backward and upward, thereby promoting the steel wire rope to be vertical, and further promoting the construction material to stop swinging.

2. A crane for construction work according to claim 1, characterised in that The moving arm mechanism has a first working state and a second working state, in the first working state, the rotation of the first gear synchronously drives the intermediate gear and the second gear to rotate as a whole around the rotation axis of the first gear through the triangular frame, thereby driving the connecting rod to rotate a first rotation angle in the arc-shaped groove, in the second working state, the rotation of the first gear rotationally drives the intermediate gear and the second gear in sequence through gear transmission, thereby making the triangular frame rotate, and simultaneously making the first gear linearly move toward the connecting rod, the linear direction is perpendicular to the axis of the connecting rod.

3. A crane for construction work according to claim 1, characterised in that The left and right ends of the connecting rod are both provided with extension teeth, and the inner wall of the arc-shaped groove is provided with limiting teeth; when the extension teeth extend from the ends of the connecting rod, the extension teeth are capable of engaging with the limiting teeth, thereby limiting the connecting rod in the arc-shaped groove, when the extension teeth retract into the ends of the connecting rod, the ends of the connecting rod are capable of sliding along the arc-shaped groove.

4. A crane for construction work according to claim 1, characterised in that The winding drum is provided with a pressing area and a sensing area, the pressing area is located at the upper half of the winding drum and occupies one half of the outer circumferential surface of the winding drum, and the sensing area is located at the lower and forward part of the winding drum and occupies one fourth of the outer circumferential surface of the winding drum.

5. A crane for construction work according to claim 4, characterised in that The pressing area is provided with a pressing ring, the pressing ring is an arc-shaped ring, a reset spring is arranged between the pressing ring and the winding drum, the reset spring facilitates the reset of the pressing ring, and a first pressure sensor is arranged between the reset spring and the winding drum.

6. A crane for construction work according to claim 4, characterised in that The sensing area comprises a plurality of sensing bands which are uniformly distributed around the axis of the winding drum, the sensing bands are connected with a second pressure sensor, and the second pressure sensor can detect the swing pressure of the sensing bands received from the steel wire rope.

7. A crane for construction work according to claim 2, characterised in that The first rotation angle is related to the maximum angle of the backward swing of the steel wire rope.

8. A crane for construction work according to claim 1, characterised in that A steering wheel is arranged between the electric hoist and the winding drum, and the steering wheel is used for the steering of the steel wire rope.

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