Hoisting device for overhauling spiral conveyor

Abstract

The utility model relates to the technical field of equipment maintenance, and provides a hoisting device for maintenance of a screw conveyer, the device comprises a cantilever, the screw conveyer and a hoisting mechanism, the cantilever comprises a vertical arm and a cross arm, the screw conveyer comprises a motor and a speed reducer, the vertical arm is connected with the cross arm, the vertical arm is connected with the screw conveyer, and the hoisting mechanism is connected with the motor. And the hoisting mechanism hoists the motor and / or the speed reducer through the cross arm to complete maintenance of the spiral conveyor. According to the scheme, the cantilever composed of the vertical arm and the cross arm is used for providing a mounting point position of the hoisting mechanism for overhauling of the spiral conveyor, so that hoisting of the motor and / or the speed reducer is completed through the cross arm and the hoisting mechanism, and overhauling of the spiral conveyor is completed.

Description

Technical Field

[0001] This disclosure relates to the field of equipment maintenance technology, and in particular to a hoisting device for the maintenance of screw conveyors. Background Technology

[0002] A screw conveyor is a machine that uses a motor to drive a screw mechanism to rotate and push materials to achieve the purpose of conveying. Due to the limitations of on-site operating conditions for screw conveyors, such as the inability to use truck cranes or electric hoists due to site constraints, or the lack of anchor points for hand chain hoists, the maintenance of screw conveyor motors, reducers, and other equipment must be carried out manually. During manual handling, there is a risk of equipment bumps and damage, and injury to transport personnel, which not only poses certain safety risks but also results in low work efficiency.

[0003] Therefore, how to perform maintenance on screw conveyors has become an urgent problem to be solved. Utility Model Content

[0004] In view of this, the present invention provides a hoisting device for the maintenance of screw conveyors, in order to solve the technical problem of how to safely and effectively complete the maintenance of screw conveyors.

[0005] To solve the above-mentioned technical problems, in a first aspect, this utility model provides a hoisting device for the maintenance of a screw conveyor, comprising: a cantilever, a screw conveyor, and a hoisting mechanism. The cantilever includes a vertical arm and a horizontal arm, and the screw conveyor includes: a motor and a reducer. The vertical arm and the horizontal arm are connected to support the horizontal arm, and the vertical arm is connected to the screw conveyor. The hoisting mechanism hoists the motor and / or the reducer through the horizontal arm to complete the maintenance of the screw conveyor.

[0006] In conjunction with the first aspect, in one possible implementation of the first aspect, the cantilever further includes: a vertical arm base, and the screw conveyor further includes: a screw structure, wherein the vertical arm base is connected to the screw structure and the vertical arm respectively, so that the vertical arm is connected to the screw conveyor through the vertical arm base and the screw mechanism.

[0007] In conjunction with the first aspect, in one possible implementation of the first aspect, the top and bottom of the support base have a first hole and a second hole corresponding to the outer diameter of the support arm, respectively, wherein the first hole and the second hole form a through hole, and the support arm is inserted into the support base through the through hole.

[0008] In conjunction with the first aspect, in one possible implementation of the first aspect, the boom base has a first limiting structure, through which the boom base changes the angle between the boom and the boom base.

[0009] In conjunction with the first aspect, in one possible implementation of the first aspect, the first limiting structure includes at least one set of sliding tracks and limiting holes used in conjunction, wherein the sliding track is located at the top of the support arm base, and the two ends of the sliding track are respectively connected to the first hole and the limiting hole, so that the support arm slides through the sliding track and into the corresponding limiting hole from the first hole.

[0010] In conjunction with the first aspect, in one possible implementation of the first aspect, one side of the boom base is concave, and the concave surface matches the curvature of the outer peripheral surface of the spiral structure, so that the boom base is connected to the screw conveyor through the concave surface.

[0011] In conjunction with the first aspect, in one possible implementation of the first aspect, the top of the vertical arm has a second limiting structure, and the horizontal arm is connected to the vertical arm through the second limiting structure.

[0012] In conjunction with the first aspect, in one possible implementation of the first aspect, the screw conveyor further includes: a screw structure, wherein the vertical arm is perpendicular to the horizontal arm and the screw structure respectively, and is connected to the screw conveyor through the screw structure.

[0013] In conjunction with the first aspect, in one possible implementation of the first aspect, the cantilever also includes a diagonal brace, the two ends of which are connected to the vertical arm and the horizontal arm, respectively.

[0014] In conjunction with the first aspect, in one possible implementation of the first aspect, the crossarm includes: at least one stop.

[0015] Through the above technical solution, this disclosure provides a lifting device for the maintenance of a screw conveyor. The lifting device includes a cantilever, a screw conveyor, and a lifting mechanism. The cantilever includes a vertical arm and a horizontal arm. The screw conveyor includes a motor and a reducer. The vertical arm and the horizontal arm are connected, and the vertical arm is also connected to the screw conveyor. The lifting mechanism uses the horizontal arm to lift the motor and / or reducer, thus completing the maintenance of the screw conveyor. This invention utilizes a cantilever composed of a vertical arm and a horizontal arm, and a screw conveyor connected to the vertical arm. The horizontal arm serves as the lifting point for the lifting mechanism, completing the lifting of the motor and / or reducer, and thus completing the maintenance of the screw conveyor. This avoids manual lifting during the process, reduces related safety risks, and improves maintenance efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a schematic diagram of the structure of a hoisting device for overhauling a screw conveyor, as disclosed in an embodiment of this disclosure;

[0018] Figure 2 This is a schematic diagram of another hoisting device for overhauling a screw conveyor disclosed in this embodiment;

[0019] Figure 3 This is disclosed in the embodiments of this disclosure. Figure 2 A partially enlarged structural diagram of the neutral arm base;

[0020] Figure 4 This is disclosed in the embodiments of this disclosure. Figure 2 A partially enlarged structural diagram of the neutral arm;

[0021] Figure 5 This is disclosed in the embodiments of this disclosure. Figure 2 A partially enlarged structural diagram of the middle crossarm.

[0022] Explanation of reference numerals in the attached figures:

[0023] 11-Motor; 12-Reducer; 13-Helical structure;

[0024] 21-Upright arm; 211-Second limiting structure; 212-First positioning hole; 213-Positioning structure;

[0025] 22-Cross arm; 221-Stop; 222-Second positioning hole;

[0026] 23 - Diagonal brace; 24 - Vertical arm base; 241 - First hole; 242 - Second hole. Detailed Implementation

[0027] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0028] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0029] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0031] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.

[0032] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0033] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0034] like Figure 1 , Figure 2 As shown, this utility model discloses a lifting device for the maintenance of a screw conveyor. The lifting device includes a cantilever, a screw conveyor, and a lifting mechanism. The cantilever includes a vertical arm 21 and a horizontal arm 22. The screw conveyor includes a motor 11 and a reducer 12.

[0035] The vertical arm 21 is connected to the horizontal arm 22 to support the horizontal arm 22. The vertical arm 21 is connected to the screw conveyor. The hoisting mechanism hoists the motor 11 and / or the reducer 12 through the horizontal arm 22 to complete the maintenance of the screw conveyor.

[0036] Specifically, such as Figure 1 As shown, the cantilever, consisting of the vertical arm 21 and the horizontal arm 22, is fixedly connected to the screw conveyor to form a fixed cantilever. The horizontal arm 22 serves as the installation position for the hoisting mechanism, which can be, for example, a hand chain hoist or other hoisting equipment. Taking a hand chain hoist as an example, the chain of the hand chain hoist is connected to the motor 11 and / or reducer 12 of the screw conveyor that needs to be hoisted via the horizontal arm 22. The horizontal arm 22 is used to complete the hoisting of the motor 11 and / or reducer 12. After the hoisting is completed, the chain provides a vertical force to the motor 11 and / or reducer 12. By translating the motor 11 and / or reducer 12, the motor 11 and / or reducer 12 are placed on a trolley or other mobile equipment, thereby allowing the motor 11 and / or reducer 12 to be inspected and repaired, thus completing the maintenance of the screw conveyor.

[0037] Specifically, such as Figure 2 As shown, the cantilever, consisting of a vertical arm 21 and a horizontal arm 22, is connected to the screw conveyor via a vertical arm base 24. This cantilever is a combined cantilever, with the horizontal arm 22 serving as the installation position for the lifting mechanism. The lifting mechanism can be, for example, a hand chain hoist or other lifting equipment. Taking a hand chain hoist as an example, the chain of the hand chain hoist is connected to the motor 11 and / or reducer 12 of the screw conveyor to be lifted via the horizontal arm 22. The horizontal arm 22 is used to lift the motor 11 and / or reducer 12. After the lifting is completed, the chain provides a vertical force to the motor 11 and / or reducer 12. By translating the motor 11 and / or reducer 12, the motor 11 and / or reducer 12 are placed on a trolley or other mobile equipment, thereby allowing the motor 11 and / or reducer 12 to be inspected and repaired, thus completing the inspection and repair of the screw conveyor.

[0038] Through the above technical solution, this disclosure provides a lifting device for the maintenance of a screw conveyor. The lifting device includes a cantilever, a screw conveyor, and a lifting mechanism. The cantilever includes a vertical arm and a horizontal arm. The screw conveyor includes a motor and a reducer. The vertical arm and the horizontal arm are connected, and the vertical arm is also connected to the screw conveyor. The lifting mechanism uses the horizontal arm to lift the motor and / or reducer, thus completing the maintenance of the screw conveyor. This invention utilizes a cantilever composed of a vertical arm and a horizontal arm, and a screw conveyor connected to the vertical arm. The horizontal arm serves as the lifting point for the lifting mechanism, completing the lifting of the motor and / or reducer, and thus completing the maintenance of the screw conveyor. This avoids manual lifting during the process, reduces related safety risks, and improves maintenance efficiency.

[0039] In some alternative embodiments, the cantilever further includes: a vertical arm base 24, and the screw conveyor further includes: a screw structure 13, wherein,

[0040] The support base 24 is connected to the spiral structure 13 and the support arm 21 respectively, so that the support arm 21 is connected to the screw conveyor through the support base 24 and the spiral mechanism 13.

[0041] Specifically, such as Figure 2 As shown, in the combined cantilever structure, one side of the boom base is connected to the helical structure 13, the boom 21 is inserted into the boom base 24, and the boom 21 is connected to the screw conveyor through the boom base 24 and the helical mechanism 13.

[0042] In some alternative embodiments, the top and bottom of the support arm base 24 respectively have a first hole 241 and a second hole 242 corresponding to the outer diameter of the support arm 21, wherein,

[0043] The first hole 241 and the second hole 242 form a through hole, through which the upright arm 21 is inserted into the upright arm base 24.

[0044] Specifically, such as Figure 2 , Figure 3 As shown, the top of the support arm base 24 has a first hole 241 and the bottom of the support arm base has a second hole 242. The first hole 241 and the second hole 242 form a through hole. The inner diameter of the first hole 241 and the second hole 242 is the same as the outer diameter of the support arm 21. That is, the inner diameter of the through hole is the same as the outer diameter of the support arm 21. Therefore, the support arm base 24 fixes the support arm 21 using the through hole formed by the first hole 241 and the second hole 242.

[0045] Specifically, to further secure the vertical arm 21, such as Figure 4 As shown, the upright arm 21 has a first positioning hole 212. The upright arm 21 is fixed to the upright arm base 24 by passing a positioning pin through the first positioning hole 212.

[0046] To prevent circumferential rotation between the boom 21 and the boom base 24 during hoisting, in one optional embodiment, the boom 21 further includes a positioning structure 213. The positioning structure 213 has a plurality of third positioning holes evenly distributed along the outer wall of the boom 21, and the boom base 24 has a plurality of fourth positioning holes evenly distributed along the first hole 241. When the boom 21 is inserted into the boom base 24 through the through hole, the positioning structure 213 contacts the top of the boom base 24. Each third positioning hole has a corresponding fourth positioning hole and a pin.

[0047] Specifically, when the vertical arm 21 rotates circumferentially around its axis, the rotation of the vertical arm 21 will cause the horizontal arm 22 to translate circumferentially, thereby changing the lifting position of the hoisting mechanism or causing the hoisting mechanism to move the motor and / or reducer being hoisted. For example, as the horizontal arm 22 rotates circumferentially from position A to position B, and position B is the target position (i.e., the position where the motor and / or reducer needs to be moved), the vertical arm 21 is fixed by inserting a pin into the third and fourth positioning holes corresponding to position B. It should be understood that the outer diameter of the pin is adapted to the inner diameter of the third and fourth positioning holes, respectively, so that after the pin is inserted into the third and fourth positioning holes, the pin's locking mechanism prevents circumferential rotation between the vertical arm 21 and the vertical arm base 24.

[0048] In some alternative embodiments, the support arm base 24 has a first limiting structure, through which the support arm base 24 changes the angle between the support arm 21 and the support arm base 24.

[0049] Specifically, when the operating area of ​​the rotary conveyor is on a slope, the vertical arm 21, inserted into the vertical arm base 24, makes the horizontal arm 22 parallel to the spiral structure 13. Through the horizontal arm 22 in this position, the force provided by the lifting mechanism is perpendicular to the slope direction and at a certain angle to the horizontal ground. Therefore, when lifting the motor and / or reducer, it may cause the motor and / or reducer to swing, resulting in equipment damage and collisions with workers, leading to safety accidents. The first limiting structure of the vertical arm base 24 changes the angle between the vertical arm 21 and the vertical arm base 24, ensuring that after the vertical arm 21 is inserted into the vertical arm base 24, it is perpendicular to the horizontal ground, thus making the horizontal arm 22 parallel to the horizontal ground. This avoids the potential swinging of the motor and / or reducer during lifting, thereby reducing the probability of safety accidents.

[0050] Specifically, when the hoisted motor and / or reducer needs to be moved from point A to point B, the position of the boom 21 corresponding to the hoisting at point A is limited by a first limiting structure to a first angle between the boom 21 and the boom base 24, and the position of the boom 21 corresponding to the hoisting at point B is limited by a second angle between the boom 21 and the boom base 24, thereby adjusting the position of the boom 21 through the first limiting structure to realize the movement of the motor and / or reducer, avoiding the process of manual lifting, further reducing related safety risks, and improving maintenance efficiency.

[0051] In some alternative embodiments, the first limiting structure includes at least one set of cooperating slides and limiting holes, wherein,

[0052] The slide is located at the top of the support arm base 24. The two ends of the slide are connected to the first hole 241 and the limiting hole, respectively, so that the support arm 21 can slide through the slide and into the corresponding limiting hole through the first hole 241.

[0053] Specifically, each set of sliding tracks and limiting holes corresponds to an angle between the vertical arm 21 and the vertical arm base 24.

[0054] Specifically, the circumference of the first hole 241 has at least one slide, and the inner diameter of each slide is greater than or equal to the outer diameter of the support arm 21, so that the support arm 21 can enter the corresponding limiting hole through the slide. The corresponding limiting hole is used to clamp the outer wall of the support arm 21, so that the support arm 21 can only return to the through hole position perpendicular to the support arm base 24 through the corresponding slide.

[0055] Specifically, when the angle between the support arm 21 and the support arm base 24 changes, the second hole 242 that contacts the support arm 21 can still hold the support arm 21 in place, and does not restrict the change of angle, so the structure of the second hole 242 remains unchanged.

[0056] In one optional embodiment, to prevent the second hole 242 in contact with the support arm 21 from limiting the angle change when the angle between the support arm 21 and the support arm base 24 changes, the second hole 242 has a slide and a limiting hole corresponding to the first hole. The slide and limiting hole of the first hole are a first slide and a first limiting hole, and the slide and limiting hole of the second hole are a second slide and a second limiting hole. The two ends of the second slide are connected to the second hole 242 and the second limiting hole, respectively. The first slide, the first limiting hole, the second slide, and the second limiting hole are used in groups and are positioned relative to each other. For example, if there is a first slide and a first limiting hole at the three o'clock position of the first hole 241, then there is a corresponding second slide and a second limiting hole at the nine o'clock position of the second hole 242. When the outer wall of the upright arm 21 that contacts the first hole 241 slides into the first limiting hole through the first slide, the outer wall of the upright arm 21 that contacts the second hole 242 simultaneously slides into the second limiting hole through the second slide. Thus, the outer wall of the upright arm 21 is locked together by the first limiting hole and the second limiting hole, so that the upright arm 21 can only return to the through hole position perpendicular to the upright arm base 24 through the corresponding slide.

[0057] In some alternative embodiments, one side of the boom base 24 is concave, which is adapted to the curvature of the outer peripheral surface of the spiral structure 13, so that the boom base 24 is connected to the screw conveyor through the concave surface.

[0058] Specifically, such as Figure 2 , Figure 3As shown, the side of the boom base 24 near the rotating screw mechanism 13 has a concave surface, which is adapted to the curvature of the outer circumference of the screw structure 13, so that the boom base 24 is connected to the screw structure 13 through the concave surface, thereby realizing the connection with the screw conveyor.

[0059] In some alternative embodiments, the top of the vertical arm 21 has a second limiting structure 211, and the horizontal arm 22 is connected to the vertical arm 21 through the second limiting structure 211.

[0060] Specifically, such as Figure 4 As shown, the second limiting structure 211 is located at the top of the upright arm 21. The second limiting structure 211 has a through hole through which the cross arm 22 passes and is connected to the upright arm 21.

[0061] Specifically, to further secure the cross arm 22, such as Figure 5 As shown, the cross arm 22 has a second positioning hole 222. A positioning pin passes through the second positioning hole 222 to fix the cross arm 22 to the second limiting structure 211.

[0062] In some alternative embodiments, the screw conveyor further includes: a screw structure 13, wherein,

[0063] The vertical arm 21 is perpendicular to the horizontal arm 22 and the spiral structure 13, and is connected to the screw conveyor through the spiral structure 13.

[0064] Specifically, such as Figure 1 As shown, in a fixed cantilever, the connection between the vertical arm 21 and the helical structure 13 can be welding, bolting, or other connection methods, and the connection between the vertical arm 21 and the horizontal arm 22 can also be welding, bolting, or other connection methods.

[0065] Specifically, the vertical arm 21 is perpendicular to the horizontal arm 22 and the spiral structure 13, which can ensure the parallelism between the horizontal arm 22 and the spiral conveyor, thereby ensuring the vertical force when the hoisting equipment uses the horizontal arm 22 to hoist the motor 11 and / or the reducer 12.

[0066] In some alternative embodiments, the cantilever also includes a diagonal brace 23, the two ends of which are connected to the vertical arm 21 and the horizontal arm 22, respectively.

[0067] Specifically, such as Figure 1 , Figure 2 As shown, the two ends of the diagonal brace are connected to the vertical arm 21 and the horizontal arm 22 respectively, and the structural strength between the vertical arm 21 and the horizontal arm 22 is further strengthened by the diagonal brace 23.

[0068] In some alternative embodiments, the crossarm 22 includes at least one stop 221.

[0069] Specifically, such as Figure 1As shown, the stop 221 is used to prevent the chain of the lifting equipment from slipping on the boom 22. The stop 221 limits the displacement of the chain. It should be understood that... Figure 2 A stop stop can also exist in the cross arm 22, but it is not shown in the figure.

[0070] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0071] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

Claims

1. A hoisting device for overhauling a screw conveyor, characterized in that, The device includes: a cantilever, a screw conveyor, and a hoisting mechanism. The cantilever includes a vertical arm (21) and a horizontal arm (22). The screw conveyor includes: a motor (11) and a reducer (12). The vertical arm (21) is connected to the horizontal arm (22) to support the horizontal arm (22). The vertical arm (21) is connected to the screw conveyor. The hoisting mechanism hoists the motor (11) and / or the reducer (12) through the horizontal arm (22) to complete the maintenance of the screw conveyor.

2. The hoisting device according to claim 1, characterized in that, The cantilever also includes: a vertical arm base (24), and the screw conveyor also includes: a screw structure (13), wherein... The support base (24) is connected to the spiral structure (13) and the support arm (21) respectively, so that the support arm (21) is connected to the screw conveyor through the support base (24) and the spiral structure (13).

3. The hoisting device according to claim 2, characterized in that, The top and bottom of the support base (24) have a first hole (241) and a second hole (242) respectively corresponding to the outer diameter of the support arm (21), wherein, The first hole (241) and the second hole (242) form a through hole, through which the upright arm (21) is inserted into the upright arm base (24).

4. The hoisting device according to claim 3, characterized in that, The support arm base (24) has a first limiting structure, and the support arm base (24) changes the angle between the support arm (21) and the support arm base (24) through the first limiting structure.

5. The hoisting device according to claim 4, characterized in that, The first limiting structure includes at least one set of cooperating slides and limiting holes, wherein, The slide is located at the top of the support base (24). The two ends of the slide are connected to the first hole (241) and the limiting hole respectively, so that the support arm (21) slides through the slide and into the corresponding limiting hole through the first hole (241).

6. The hoisting device according to claim 2, characterized in that, One side of the boom base (24) is concave, and the concave surface is adapted to the curvature of the outer peripheral surface of the spiral structure (13), so that the boom base (24) is connected to the spiral conveyor through the concave surface.

7. The hoisting device according to claim 2, characterized in that, The top of the vertical arm (21) has a second limiting structure (211), and the horizontal arm (22) is connected to the vertical arm (21) through the second limiting structure (211).

8. The hoisting device according to claim 1, characterized in that, The screw conveyor also includes: a screw structure (13), wherein, The vertical arm (21) is perpendicular to the horizontal arm (22) and the spiral structure (13) respectively, and is connected to the spiral conveyor through the spiral structure (13).

9. The hoisting device according to any one of claims 2 to 8, characterized in that, The cantilever also includes a diagonal brace (23), the two ends of which are connected to the vertical arm (21) and the horizontal arm (22), respectively.

10. The hoisting device according to any one of claims 2 to 8, characterized in that, The cross arm (22) includes at least one stop (221).

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