A cantilever lifting device

Abstract

This application discloses a cantilever lifting device, comprising: a column; a cantilever, one end of which is rotatably connected to the column via a main slewing bearing; an auxiliary slewing bearing, the fixed part of which is fixedly connected to the other end of the cantilever; a transmission mechanism, comprising a positioning sprocket and a movable sprocket, the positioning sprocket being fixedly connected to the upper end of the column, the movable sprocket being fixedly connected to the rotating part of the auxiliary slewing bearing, and a chain being sleeved on the positioning sprocket and the movable sprocket; a lifting hydraulic cylinder, the cylinder body of which is fixedly connected to the rotating part of the auxiliary slewing bearing, the piston rod of which is connected to a gripping mechanism; and a guide wheel, installed on the lower side of the cantilever, for rolling contact with the column when the cantilever rotates around the column. When the lifting device lifts a heavy object, the rotational motion of the cantilever is transmitted to the auxiliary slewing bearing through the transmission mechanism, causing the auxiliary slewing bearing to rotate in the opposite direction to the cantilever, thus maintaining the orientation of the heavy object and facilitating the orderly placement of the heavy object or the alignment and installation of the heavy object.

Description

Technical Field

[0001] This utility model belongs to the field of lifting equipment technology, specifically, it relates to a cantilever lifting device. Background Technology

[0002] A crane is a multi-action lifting machine that vertically lifts and horizontally moves heavy objects within a certain range. Usually, the heavy object is suspended by hooks at the front end of the boom. The steel wire rope tied to the heavy object is hung on the hook, and then the boom rotates horizontally to rotate the heavy object to the desired position. The boom then lowers the heavy object and places it in that position. Alternatively, the heavy object can be lifted by electromagnetic force or other methods.

[0003] Regardless of the method used to suspend a heavy object, its orientation will change during the rotation of the crane boom. For example, if a steel cable is used to suspend the object, it will sway during boom rotation, causing not only a change in orientation but also an uncontrolled and disordered one. Even with manual support from the side, it's difficult to guarantee that the object's orientation will remain constant. While electromagnetic lifting does prevent swaying, the object's orientation will still change.

[0004] If the weight is not secured, it is prone to uncontrollable rotation when suspended in the air. If the weight is secured, for example, by using electromagnetic lifting, although it will not rotate on its own, its orientation will change as the crane arm rotates horizontally. This makes it difficult to place the weight and increases the difficulty for workers to disassemble it.

[0005] However, the applicant discovered that in equipment installation and various construction scenarios, maintaining the initial lifting position of heavy objects greatly facilitates installation. This allows the heavy objects to be positioned on the ground according to their intended installation orientation, and then their orientation to remain unchanged throughout the lifting process. This eliminates the need for laborious alignment during installation. Similarly, in scenarios involving stacking heavy objects, maintaining the same orientation on the ground during lifting also significantly facilitates the stacking and arrangement of heavy objects.

[0006] However, there is currently no technical solution for maintaining the orientation of heavy objects during suspension. Therefore, it is necessary to study the orientation of heavy objects during suspension to ensure that the orientation of heavy objects remains unchanged during hoisting. Utility Model Content

[0007] To address the above issues, this application employs a transmission mechanism to transmit the rotational motion of the cantilever to the secondary slewing support, enabling the load to rotate in the opposite direction and maintaining its orientation. This greatly facilitates the placement and alignment of the load during installation. Furthermore, this application utilizes a four-bar linkage connected to the tension sprocket, positioning sprocket, and movable sprocket to ensure chain tension regardless of cantilever extension or retraction, thereby reliably guaranteeing the counter-rotational force exerted by the chain on the secondary slewing support.

[0008] This application provides a cantilever lifting device, comprising:

[0009] Columns;

[0010] The cantilever has one end rotatably connected to the column via a main slewing bearing.

[0011] A secondary slewing bearing, the fixed part of which is fixedly connected to the other end of the cantilever;

[0012] The transmission mechanism includes a positioning sprocket and a movable sprocket. The positioning sprocket is fixedly connected to the upper end of the column, and the movable sprocket is fixedly connected to the rotating part of the auxiliary slewing bearing. The chain is sleeved on the positioning sprocket and the movable sprocket.

[0013] A lifting hydraulic cylinder has its cylinder body fixedly connected to the rotating part of the auxiliary slewing bearing, and its piston rod is connected to a gripping mechanism used to grip heavy objects.

[0014] A guide wheel is installed on the underside of the cantilever and is used to make rolling contact with the column when the cantilever rotates around the column.

[0015] Optionally, a vertical shaft is fixedly connected to the upper end of the column, the positioning sprocket is fixedly connected to the vertical shaft, and a first vertical cylinder is fixedly connected to one end of the cantilever. The first vertical cylinder is coaxially connected to the outside of the vertical shaft through a bearing.

[0016] Optionally, the main slewing bearing includes an inner ring and an outer ring that are rotatably connected. The outer ring of the main slewing bearing is fixedly connected to the upper end of the column and has teeth evenly distributed on it. The inner ring of the main slewing bearing is fixedly connected to the cantilever, and a motor is fixedly connected to the cantilever. The output shaft of the motor is connected to a gear, and the gear meshes with the outer ring of the main slewing bearing.

[0017] Optionally, it also includes an extension arm, which is slidably sleeved on the other end of the cantilever, and a cantilever hydraulic cylinder is connected between the cantilever and the extension arm. The fixing part of the secondary slewing bearing is fixedly connected to the extension arm.

[0018] Optionally, tension sprockets are provided on both sides of the cantilever hydraulic cylinder along its axial direction. Each tension sprocket is rotatably connected to one end of two connecting rods. The other end of one connecting rod is rotatably connected to a positioning sprocket, and the other end of the other connecting rod is rotatably connected to a movable sprocket.

[0019] Optionally, one of the tension sprockets is fixed in position.

[0020] Optionally, a second vertical cylinder is fixedly connected to the other end of the cantilever. The secondary slewing bearing includes an inner ring and an outer ring that are rotatably connected. The outer ring of the secondary slewing bearing is fixedly connected to the second vertical cylinder as a fixed part, and the inner ring of the secondary slewing bearing is fixedly connected to the movable sprocket as a rotating part.

[0021] Compared with the prior art, this application has the following advantages:

[0022] (1) When the lifting device lifts a heavy object, the rotational motion of the cantilever is transmitted to the secondary slewing bearing through the transmission mechanism, so that the secondary slewing bearing rotates in the opposite direction to the cantilever, which can keep the orientation of the heavy object unchanged, making it convenient for the orderly placement of the heavy object or the alignment and installation of the heavy object.

[0023] (2) This application utilizes the cooperation between the positioning sprocket and the movable sprocket with the chain, and the positioning sprocket is fixed and the movable sprocket rotates around the column, so that the chain applies a reverse rotational force to the movable sprocket, thereby keeping the orientation of the weight unchanged.

[0024] (3) The tension sprocket, positioning sprocket and movable sprocket are connected by a four-bar linkage. Regardless of whether the cantilever is extended or retracted, the tension sprocket can be guaranteed to tension the chain, thereby ensuring that the chain can reliably apply a reverse rotational force to the secondary slewing bearing. Attached Figure Description

[0025] Figure 1 This is a front view of the cantilever lifting device described in an embodiment of this utility model.

[0026] Figure 2 This is a top view of the cantilever lifting device described in an embodiment of the present invention.

[0027] Figure 3 In the diagram, (a) is a schematic diagram of the four-bar linkage with the extension arm extended, and (b) is a schematic diagram of the four-bar linkage with the extension arm retracted.

[0028] Figure 4 This is a schematic diagram of the cantilever in its initial position according to an embodiment of the present invention.

[0029] Figure 5 This is a schematic diagram of the cantilever rotating to a 45° position according to an embodiment of the present invention.

[0030] Figure 6 This is a schematic diagram of the cantilever rotating 90° position according to an embodiment of the present invention.

[0031] Figure 7 This is a schematic diagram of the cantilever rotating to a 135° position according to an embodiment of the present invention.

[0032] Figure 8 This is a schematic diagram of the cantilever rotating 180° position according to an embodiment of the present invention.

[0033] Reference numerals in the attached drawings: 1. Column; 2. Main slewing bearing; 3. Gear; 4. Motor; 5. Cantilever; 6. Bearing; 7. Positioning sprocket; 8. Connecting rod; 9. Cantilever hydraulic cylinder; 10. Chain; 11. Tensioning sprocket; 12. Extension arm; 13. Lifting hydraulic cylinder; 14. Movable sprocket; 15. Secondary slewing bearing; 16. Grabbing mechanism; 17. Weight; 101. Vertical shaft; 501. First vertical cylinder; 502. Second vertical cylinder; 503. Guide wheel. Detailed Implementation

[0034] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0035] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after connection. "Rotary connection" refers to a connection where the components can rotate relative to each other after connection. The directional terms mentioned in the embodiments of this application, such as "upper," "lower," "inner," and "outer," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. The phrase "two components obtain an integrated structure through an integral molding process" means that during the formation of one of the two components, that component is connected to the other component, without requiring further processing (such as bonding, welding, snap-fit ​​connection, or screw connection) to connect the two components together.

[0036] Please refer to Figure 1 , Figure 2The cantilever lifting device in this embodiment includes a column 1, a main slewing bearing 2, a gear 3, a motor 4, a cantilever 5, a bearing 6, a positioning sprocket 7, a chain 10, a tensioning sprocket 11, a lifting hydraulic cylinder 13, a movable sprocket 14, a secondary slewing bearing 15, and a gripping mechanism 16.

[0037] The column 1 is erected and can be fixedly connected to the truck bed at the rear of the vehicle, serving as a truck-mounted crane, allowing it to move with the vehicle to any area requiring lifting operations. Alternatively, it can be fixedly connected to other mobile mechanisms, such as being movably mounted on a rail, allowing it to move along the rail to the area requiring lifting operations within the rail's range. It can also be fixedly connected to a fixed location on the ground, allowing lifting operations to be performed only within that designated area.

[0038] The main slewing bearing 2 includes an inner ring, an outer ring, and rolling elements disposed between the inner and outer rings. The outer and inner rings are rotatably connected, with the relatively fixed part referred to as the fixed part and the relatively rotating part as the rotating part. The outer ring of the main slewing bearing 2 has teeth evenly distributed around its circumference and is fixedly connected to the upper end of the column 1 by fasteners, thus keeping the outer ring stationary. The inner ring of the main slewing bearing 2 is fixedly connected to the cantilever 5 by fasteners. A motor 4 is fixedly connected to the cantilever 5; for example, the housing of the motor 4 is fixedly connected to the cantilever 5. A gear 3 is coaxially connected to the output shaft of the motor 4, and the gear 3 meshes with the teeth of the outer ring of the main slewing bearing 2. The motor 4 drives the gear 3 to rotate, causing the gear 3 to mesh with the outer ring of the main slewing bearing 2. Since the outer ring is stationary, the gear 3 rotates around the column 1 while rotating, causing the cantilever 5, which is fixedly connected to the motor 4, to also rotate around the column 1. Therefore, driven by the motor 4, the cantilever 5 can be rotated 360° to rotate the load to the desired position.

[0039] The above are merely examples. This application does not exclude the possibility that the motor 4 is fixedly connected to the column 1, the inner ring of the main slewing bearing 2 is fixedly connected to the column 1, the motor 4 drives the gear 3 to rotate, the gear 3 meshes with the outer ring of the main slewing bearing 2, thereby driving the outer ring of the main slewing bearing 2 to rotate, and the cantilever 5 is fixedly connected to the outer ring of the main slewing bearing 2, thereby driving the cantilever 5 to rotate 360°.

[0040] Alternatively, the main slewing bearing can be replaced by a bearing, which also requires setting the inner and outer rings of the drive bearing to rotate relative to each other. A sliding bushing can also be used, again requiring setting the inner and outer rings of the drive bearing to rotate relative to each other.

[0041] A vertical shaft 101 is fixedly connected to the upper end of the column 1, and a positioning sprocket 7 is fixedly connected to the vertical shaft 101. One end of the cantilever 5 is fixedly connected to a first vertical cylinder 501, which is coaxially sleeved on the outside of the vertical shaft 101. A bearing 6 is installed between the first vertical cylinder 501 and the vertical shaft 101 to provide stable rotational support for the cantilever 5. The positioning sprocket 7 can be integrally formed with the vertical shaft 101, or it can be installed on the vertical shaft 101 by means of fasteners, welding, etc.

[0042] Since the positioning sprocket 7 is fixedly connected to the column 101, there is no relative rotation between the positioning sprocket 7 and the column 1. When the motor 4 is running, it drives the gear 3 to rotate. At this time, the cantilever 5 will rotate around the column 1 under the drive of the gear 3, while the positioning sprocket 7 remains stationary.

[0043] A second vertical cylinder 502 is fixedly connected to the other end of the cantilever 5. The secondary slewing bearing 15 includes an inner ring, an outer ring, and rolling elements disposed between the inner and outer rings. The outer ring and the inner ring are rotatably connected. The relatively fixed parts are called the fixed parts, and the relatively rotating parts are called the rotating parts. The outer ring of the secondary slewing bearing 15 is fixedly connected to the other end of the cantilever 5, specifically, to the second vertical cylinder 502, which allows the secondary slewing bearing 15 to rotate around the column 1 together with the cantilever 5.

[0044] The inner ring of the secondary slewing bearing 15 is fixedly connected to the movable sprocket 14, and the chain 10 is sleeved on the positioning sprocket 7 and the movable sprocket 14. When the motor 4 runs, it drives the cantilever 5 to rotate around the column 1. Since the positioning sprocket 7 is fixed, as the other end of the cantilever 5 rotates around the column 1, the chain 10 will provide a driving force in the opposite direction to the movable sprocket 14. Since the movable sprocket 14 and the second vertical cylinder 502 are rotatably connected through the secondary slewing bearing 15, the movable sprocket 14 rotates in the opposite direction while following the rotation of the cantilever 5 around the column 1. It should be noted that the reverse rotation mentioned here means that the movable sprocket 14 rotates around its own center.

[0045] However, this application does not rule out the possibility that the inner ring of the secondary slewing bearing 15 could be fixedly connected to the second vertical cylinder 502 at the other end of the cantilever 5, and the outer ring of the secondary slewing bearing 15 could be fixedly connected to the movable sprocket 14. This is also possible.

[0046] Alternatively, the secondary slewing bearing can be replaced by a bearing, which also requires setting the inner and outer rings of the drive bearing to rotate relative to each other. A sliding bushing can also be used, again requiring setting the inner and outer rings of the drive bearing to rotate relative to each other.

[0047] As the movable sprocket 14 rotates around the column 1 along with the cantilever 5, it also rotates in the opposite direction, which makes the direction of the movable sprocket 14 consistent with that of the positioning sprocket 7, that is, the direction of the movable sprocket 14 is consistent with the direction of the column 1; the lifting hydraulic cylinder 13 installed on the movable sprocket 14 rotates at the same time as the movable sprocket 14, and the direction of the weight 17 gripped by its gripping mechanism 16 will also remain relatively unchanged with the direction of the column 1 during the rotation.

[0048] The cylinder body of the lifting hydraulic cylinder 13 is fixedly connected to the movable sprocket 14. For example, it can be fixedly connected to the inner ring of the auxiliary slewing bearing 15. The piston rod end of the lifting hydraulic cylinder 13 is connected to the gripping mechanism 16, which can be used to grip heavy objects. The piston rod of the lifting hydraulic cylinder 13 can extend and retract within the cylinder body to lift or lower the heavy object. The gripping mechanism 16 can be, for example, a chuck to grip the heavy object, or an electromagnet to lift the heavy object using magnetic force. This application does not even exclude the possibility that the gripping mechanism could simply be a hook, allowing for manual assistance in gripping the heavy object. However, during the cantilever rotation, the orientation of the heavy object can be maintained without human intervention to ensure its orientation.

[0049] In some embodiments, the cantilever of this application can be telescopic. For this purpose, a cantilever hydraulic cylinder 9 is connected to one end of the cantilever 5. Of course, the cantilever hydraulic cylinder 9 can also be replaced by a pneumatic cylinder or an electric push rod. The cantilever 5 and the extension arm 12 are connected by a cantilever hydraulic cylinder 9. When the cantilever hydraulic cylinder 9 extends or retracts, the extension arm 12 can extend or retract along the cantilever 5, and the second vertical cylinder 502 is fixedly connected to the extension arm. For example, the cantilever 5 can be cylindrical, and one end of the cantilever hydraulic cylinder 9 is inserted into the cantilever 5 and rotatably connected to that end of the cantilever 5. The extension arm 12 is slidably sleeved with the cantilever 5, and the other end of the extension arm 12 is rotatably connected to the cantilever hydraulic cylinder 9. Under the extension and retraction action of the cantilever hydraulic cylinder 9, the extension arm 12 can extend and retract on the cantilever 5, thereby changing the length of the cantilever 5.

[0050] As the extension arm retracts, the distance between the movable sprocket 14 and the positioning sprocket 7 shortens, causing the chain 10 to be unreliably fitted onto the movable sprocket 14 and the positioning sprocket 7. Therefore, this application also provides a tensioning sprocket 11, which is rotatably connected to the positioning sprocket 7 and the movable sprocket 14 via connecting rods 8. Specifically, the tensioning sprocket 11 is rotatably connected to one end of two connecting rods 8, and the other ends of the two connecting rods 8 are rotatably connected to the movable sprocket 14 and the positioning sprocket 7, respectively. When the extension arm 12 retracts, the distance between the movable sprocket 14 and the positioning sprocket 7 shortens. As the movable sprocket 14 moves, it pushes the connecting rods 8 to shift, and the connecting rods 8 further push the tensioning sprocket 11 to move outward, thereby tensioning the chain 10.

[0051] Preferably, a tension sprocket 11 can be provided on each side of the cantilever hydraulic cylinder 9. Each tension sprocket 11 is rotatably connected to two connecting rods 8. One connecting rod 8 is rotatably connected to the positioning sprocket 7, and the other connecting rod 8 is rotatably connected to the movable sprocket 14. The positioning sprocket 7, tension sprocket 11, and movable sprocket 14 are connected together by four connecting rods 8 to form a linkage mechanism. The positioning sprocket 7, tension sprocket 11, and movable sprocket 14 are located at the four hinge points of the linkage mechanism. When the cantilever hydraulic cylinder 9 extends or retracts, the extension arm 12 can extend or retract along the inner wall of the cantilever 5, and the distance between the positioning sprocket 7 and the movable sprocket 14 extends or retracts. At this time, the linkage mechanism 8 can extend or compress accordingly.

[0052] Alternatively, the linkage mechanism can also be a parallel linkage mechanism, where one of the tension sprockets 11 is fixed in position. When the extension arm 12 retracts, the linkage mechanism forms a parallelogram because the column 1 and one tension sprocket 11 are fixed. However, since only one tension sprocket 11 can move, the range of angles that can be adjusted for the weight 17 is relatively small.

[0053] When the extension arm 12 extends or retracts along the inner wall of the cantilever 5 under the action of the cantilever hydraulic cylinder 9, that is, when the lifting distance of the lifting device needs to be adjusted, the linkage mechanism can extend or shorten along the axial direction of the cantilever 5. At the same time, the linkage mechanism can be compressed or extended in the width direction, which drives the position of the tension sprocket 11 to move closer to or away from the axis of the cantilever 5, so that the chain 10 is always in a taut state, and the orientation between the positioning sprocket 7 and the movable sprocket 14 remains unchanged.

[0054] like Figure 3 As shown, (a) represents the state and positional relationship of each component when the cantilever is extended. At this time, the cantilever hydraulic cylinder 9 is extended, the distance between the movable sprocket 14 and the positioning sprocket 7 is relatively far, and the distance between the tension sprockets 11 is relatively close. The linkage mechanism presents a quadrilateral that is long in the horizontal direction and short in the vertical direction. (b) represents the cantilever retracted state. At this time, the cantilever hydraulic cylinder 9 is in the retracted state, the distance between the movable sprocket 14 and the positioning sprocket 7 is relatively close, and the distance between the tension sprockets 11 is relatively far. The linkage mechanism presents a quadrilateral that is short in the horizontal direction and long in the vertical direction.

[0055] This application uses the tension sprocket 11 to adjust the tension of the chain sleeved on the positioning sprocket 7 and the movable sprocket 14 as the extension arm 12 extends and retracts, so as to ensure that the chain 10 can always be kept taut, so that the chain can provide reliable reverse rotation power to the movable sprocket 14.

[0056] Please refer to the attached document. Figures 4 to 8 The weight 17 is used to represent the object being lifted. To facilitate the explanation of the principle of the lifting device, the weight 17 has a triangle indicating the direction. Figure 4 This is a schematic diagram of the initial position of the cantilever. Figure 5This is a schematic diagram showing the position of the cantilever after rotating counterclockwise by 45°. The dotted line represents the orientation of the weight 17 after the cantilever 5 rotates counterclockwise by 45° without the movable sprocket 14 and other components of this application. It can be seen that the orientation of the weight 17 changes; while the weight 17 rotates counterclockwise around the column 1 along with the cantilever 5, it also rotates counterclockwise by 45° relative to its own center. Because the chain 10 of this application provides a counter-direction thrust to the movable sprocket 14, the movable sprocket 14 rotates in the opposite direction. The rotation of the movable sprocket 14 is equal to the rotation of the cantilever by the same number of degrees. Figure 4 The cantilever rotates 45° counterclockwise, and the movable sprocket 14 rotates 45° in the opposite direction, so that the orientation of the weight 17 does not change. Figure 6 The middle section is a cantilever that rotates 90° counterclockwise. Figure 7 It is the cantilever 5 rotating counterclockwise 135°. Figure 8 It can be seen that the cantilever 5 rotates 180° counterclockwise. Figures 4 to 8 In this case, no matter how the cantilever 5 rotates, the orientation of the weight 17 remains unchanged.

[0057] In some embodiments, instead of chain drive, rack and pinion drive can be used. By transmitting the rotation of the cantilever 5 around the column 1 to the rack, and then through rack and pinion drive to the outer ring of the secondary slewing bearing at the other end of the cantilever 5, the outer ring rotates relative to the inner ring in the opposite direction to the rotation of the cantilever around the column, thereby keeping the weight 17 facing the same direction.

[0058] In some embodiments, a guide wheel 503 that can roll along the outer wall of the column 1 is installed below the cantilever 5, providing support and guidance for the cantilever 5. The guide wheel 503 is connected to the lower end of the cantilever 5 by a steel section, with its axis vertically oriented and its rim contacting the outer wall of the column 1. During the rotation of the cantilever 5 around the column 1, the guide wheel 503 rolls and supports the column 1, allowing the cantilever 5 to rotate stably.

[0059] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications all fall within the protection scope of the claims of this utility model.

Claims

1. A cantilever lifting device, characterized in that, include: Columns; The cantilever has one end rotatably connected to the column via a main slewing bearing. A secondary slewing bearing, the fixed part of which is fixedly connected to the other end of the cantilever; The transmission mechanism includes a positioning sprocket and a movable sprocket. The positioning sprocket is fixedly connected to the upper end of the column, and the movable sprocket is fixedly connected to the rotating part of the auxiliary slewing bearing. The chain is sleeved on the positioning sprocket and the movable sprocket. A lifting hydraulic cylinder has its cylinder body fixedly connected to the rotating part of the auxiliary slewing bearing, and its piston rod is connected to a gripping mechanism used to grip heavy objects. A guide wheel is installed on the underside of the cantilever and is used to make rolling contact with the column when the cantilever rotates around the column.

2. The cantilever lifting device according to claim 1, characterized in that, A vertical shaft is fixedly connected to the upper end of the column, and a positioning sprocket is fixedly connected to the vertical shaft. A first vertical cylinder is fixedly connected to one end of the cantilever, and the first vertical cylinder is coaxially connected to the outside of the vertical shaft through a bearing.

3. The cantilever lifting device according to claim 1, characterized in that, The main slewing bearing includes an inner ring and an outer ring that are rotatably connected. The outer ring of the main slewing bearing is fixedly connected to the upper end of the column and has teeth evenly distributed on it. The inner ring of the main slewing bearing is fixedly connected to the cantilever, and a motor is fixedly connected to the cantilever. The output shaft of the motor is connected to a gear, and the gear meshes with the outer ring of the main slewing bearing.

4. The cantilever lifting device according to claim 1, characterized in that, It also includes an extension arm, which is slidably sleeved on the other end of the cantilever. A cantilever hydraulic cylinder is connected between the cantilever and the extension arm, and the fixing part of the secondary slewing bearing is fixedly connected to the extension arm.

5. A jibbing device according to claim 4, characterised in that Tensioning sprockets are provided on both sides of the cantilever hydraulic cylinder along its axial direction. Each tensioning sprocket is rotatably connected to one end of two connecting rods. The other end of one connecting rod is rotatably connected to a positioning sprocket, and the other end of the other connecting rod is rotatably connected to a movable sprocket.

6. A jibbing device according to claim 5, characterised in that One of the tension sprockets is in a fixed position.

7. The jibbing hoist apparatus of claim 1, wherein, A second vertical cylinder is fixedly connected to the other end of the cantilever. The secondary slewing bearing includes an inner ring and an outer ring that are rotatably connected. The outer ring of the secondary slewing bearing is fixedly connected to the second vertical cylinder as a fixed part, and the inner ring of the secondary slewing bearing is fixedly connected to the movable sprocket as a rotating part.

Images