Safety type auxiliary hoisting structure of rotary arm of tower crane
By installing a jib auxiliary lifting structure on a tower crane, the problems of maintaining high-position components and lifting large tonnages are solved, providing a convenient solution for maintenance and material lifting, reducing costs and ensuring safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- MANITOWOC CRANE EQUIP (CHINA) CO LTD
- Filing Date
- 2025-08-29
- Publication Date
- 2026-06-26
AI Technical Summary
During the maintenance and repair of existing tower cranes, it is difficult to replace the hoisting mechanism and luffing mechanism components at high positions or to lift auxiliary materials, and the use of large-tonnage truck cranes is costly.
A jib auxiliary lifting structure is installed on the counterweight boom, including a column, auxiliary main boom, extension boom, auxiliary winch and pulley system, with safety devices to prevent overload, providing multiple lifting capacity and expanding the working radius.
It enables convenient component repair and material lifting on tower cranes, reduces maintenance costs, and ensures operational safety and efficiency through safety devices.
Smart Images
Figure CN224411258U_ABST
Abstract
Description
Technical Field
[0001] This application relates to tower cranes, and more particularly to a safety-type jib auxiliary lifting structure for tower cranes. Background Technology
[0002] Currently, top-slewing tower cranes are the mainstream type of tower crane. The hoisting and luffing mechanisms of large luffing jib tower cranes are both located on the counterweight jib. Due to the large height of tower cranes, the hoisting and luffing mechanisms are also positioned very high. During the maintenance and repair of the hoisting and luffing mechanisms, some parts may need to be replaced, or some auxiliary materials may need to be lifted. If a truck crane is used, a large-tonnage truck crane is required to meet the lifting height requirements, but this is extremely costly. Utility Model Content
[0003] The purpose of this invention is to provide a safe jib auxiliary hoist structure for tower cranes. The jib auxiliary hoist is arranged near the hoisting and luffing mechanisms on the counterweight jib to facilitate customer maintenance and repair. This auxiliary hoist can also be used for lifting other tower crane components or auxiliary materials, bringing convenience to customers. Because auxiliary hoists are used infrequently, they are usually made in a simpler way to reduce costs.
[0004] To achieve the above objectives, the present invention provides the following technical solution.
[0005] This application discloses a safety-type jib auxiliary lifting structure for tower cranes, installed between the hoisting mechanism and the luffing mechanism. It includes a column, which is rotatably mounted on a counterweight boom around its axis. An auxiliary base boom is mounted on the top of the column, and an extension boom is movably mounted on the auxiliary base boom along its extension direction. An auxiliary winch is also provided on the top of the column. The wire rope of the auxiliary winch passes sequentially through a rope-laying pulley, a steering pulley, and a fixed pulley before connecting to an auxiliary hook. The rope-laying pulley is mounted on the auxiliary base boom, the steering pulley is mounted on the column, and the fixed pulley is mounted on the extension boom.
[0006] Preferably, in the above-mentioned safety-type jib auxiliary hoisting structure for tower cranes, a ladder is provided on the outside of the column.
[0007] Preferably, in the above-mentioned safety-type jib auxiliary hoisting structure for tower cranes, the auxiliary basic jib is rotatably mounted on the column.
[0008] Preferably, in the above-mentioned safety-type jib auxiliary lifting structure for tower cranes, the extension arm is provided with multiple mounting holes for mounting the fixed pulleys.
[0009] Preferably, in the above-mentioned safety-type jib auxiliary hoisting structure for tower cranes, the rope pulley is slidably mounted on the shaft along its axis, and both ends of the shaft are mounted to the auxiliary basic boom via connecting plates.
[0010] Preferably, in the above-mentioned safety-type jib auxiliary hoisting structure for tower cranes, a rope-stopping bar is provided above the rope-laying pulley.
[0011] Preferably, in the above-described safety-type jib auxiliary hoisting structure for tower cranes, a support is provided at the bottom of the auxiliary winch, one end of the bottom of the auxiliary winch is rotatably mounted on the support, and the other end of the bottom of the auxiliary winch is supported on the support by a spring washer. A limit switch is provided on one side of the spring washer at the bottom of the auxiliary winch.
[0012] When the tension of the wire rope reaches the rated value, the spring washer is compressed until the bottom of the limit switch contacts the bracket, the limit switch is triggered, and the limit switch cuts off the lifting upward action to ensure that the auxiliary crane is not overloaded.
[0013] Compared with existing technologies, the advantages of this technical solution are:
[0014] 1. It can be used at 1x or 2x to increase the auxiliary lifting weight.
[0015] 2. Install an extension boom to increase the working radius. Both the base boom and the extension boom have a row of fixed pulley mounting holes; changing the mounting position of the fixed pulleys can change the lifting radius.
[0016] 3. A lifting capacity limit device was installed to ensure that the load is not overloaded, thus ensuring the safety of the auxiliary crane.
[0017] 4. Install a rope guiding device to prevent the winch rope from getting tangled.
[0018] 5. Set up dedicated lifting lugs to ensure the posture of the auxiliary hoist during installation, making the installation process convenient and quick.
[0019] 6. Ladders are provided to facilitate personnel climbing to install and adjust auxiliary hoists. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this application 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 recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1The diagram shown is a positional diagram of the safety-type jib auxiliary hoisting structure for tower cranes in an embodiment of this utility model;
[0022] Figure 2 The diagram shown is a single-rate longest boom state diagram of the safety-type jib auxiliary hoisting structure for tower cranes in an embodiment of this utility model.
[0023] Figure 3 The diagram shown is a diagram of the longest boom state of the safety-type jib auxiliary lifting structure for tower cranes in an embodiment of this utility model, with a maximum boom ratio of 2.
[0024] Figure 4 The diagram shown is a schematic of the tower crane safety jib auxiliary hoisting structure without the extension arm at a maximum amplitude of 2 times in this embodiment of the present invention.
[0025] Figure 5 The diagram shown is a schematic of the tower crane safety jib auxiliary hoisting structure without the extension arm at a minimum amplitude of 2 times in an embodiment of this utility model.
[0026] Figure 6 The diagram shown is a diagram of the tower crane safety jib auxiliary lifting structure in the embodiment of this utility model with the auxiliary basic boom retracted.
[0027] Figure 7 The diagram shown is a schematic diagram of the rope pulley in an embodiment of this utility model;
[0028] Figure 8 The diagram shown is a schematic of the auxiliary winch in an embodiment of this utility model. Detailed Implementation
[0029] The technical solutions of the present utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0030] Combination Figure 1-8As shown, a safety-type jib auxiliary lifting structure 100 for tower cranes is installed between the hoisting mechanism 200 and the luffing mechanism 300. It includes a column 101, which is rotatably mounted on a counterweight jib 102 around its axis. An auxiliary base jib 103 is mounted on the top of the column 101, and an extension jib 104 is movably mounted on the auxiliary base jib 103 along its extension direction. An auxiliary winch 105 is also installed on the top of the column 101. The wire rope 106 of the auxiliary winch 105 passes sequentially through a rope guide pulley 107, a steering pulley 108, and a fixed pulley 109 before connecting to an auxiliary hook 110. The rope guide pulley 107 is mounted on the auxiliary base jib 103, the steering pulley 108 is mounted on the column 101, and the fixed pulley 109 is mounted on the extension jib 104. A ladder 111 is provided on the outside of the column 101. The auxiliary base jib 103 is rotatably mounted on the column 101. The extension arm 104 is provided with multiple mounting holes 112 for mounting fixed pulleys 109. A rope-guiding pulley 107 is slidably mounted on a shaft 113 along its axis, and both ends of the shaft 113 are mounted to the auxiliary base arm 103 via connecting plates 114. A rope-blocking rod 115 is provided above the rope-guiding pulley 107. A bracket 116 is provided at the bottom of the auxiliary winch 105. One end of the bottom of the auxiliary winch 105 is rotatably mounted on the bracket 116, and the other end of the bottom of the auxiliary winch 105 is supported on the bracket 116 by a spring washer 117. A limit switch 118 is provided on one side of the spring washer 117 at the bottom of the auxiliary winch 105.
[0031] When the tension of the wire rope 106 reaches the rated value, the spring washer 117 is compressed to the bottom contact bracket 116 of the limit switch 118, the limit switch 118 is triggered, and the limit switch 118 cuts off the lifting upward action to ensure that the auxiliary crane is not overloaded.
[0032] In practice, the auxiliary hoist is positioned between the hoisting mechanism and the luffing mechanism, close to the motor. This allows for the consideration of the hoisting mechanism and luffing mechanism's potential needs for lifting and maintaining components.
[0033] The support column is installed in the auxiliary hoist base of the counterweight boom and can be rotated manually. The extension arm of the auxiliary hoist is installed on the main boom and its position is adjustable to expand the working range of the auxiliary hoist. When the wire rope swings left and right on the drum, the rope guide pulley will drive this pulley to swing left and right along its pulley axis to ensure that the rope entry angle of the drum does not exceed 1.5 degrees and to prevent the drum from getting tangled. The ladder facilitates the installation and adjustment of the auxiliary hoist at height. When hoisting the entire auxiliary hoist, the hoisting boom is unfolded, and the lifting point is at the head of the hoisting boom. The hoisting boom is used to avoid interference between the slings and the auxiliary hoist. The main boom of the auxiliary hoist is equipped with lifting lugs.
[0034] Figure 2 The demonstration shows the operation using the extension boom and a 1x radius. At this point, the maximum working radius of the auxiliary crane is 3162mm, and the maximum lifting capacity of the auxiliary crane at this radius is 500kg.
[0035] like Figure 3 As shown, the auxiliary crane operates at a 2x radius using an extended boom, requiring the installation of a pulley block. At this point, the maximum working radius of the auxiliary crane is 3000mm, and its maximum lifting capacity is 1200kg.
[0036] like Figure 4 and 5 As shown, this is the case where the auxiliary crane is not using its extension boom and is operating at 2x leverage. In this configuration, the minimum working radius of the auxiliary crane is 557mm, and the maximum working radius is 1457mm. The maximum lifting capacity of the auxiliary crane is 1500kg for both the minimum and maximum working radius.
[0037] like Figure 6 As shown, the auxiliary hoist is in its stored state. The extension arm is mounted on the main arm, which is folded down, and the hook pulley block is attached to the end of the extension arm. When folded, the auxiliary hoist lies flat, reducing its overall size for easier transport. During installation, the lifting boom is unfolded, with lifting points at its end. The purpose of the lifting boom is to prevent interference between the slings and the auxiliary hoist.
[0038] like Figure 7 As shown, the rope guide pulley is mounted on the pulley shaft. The rope stop bar is mounted on the end bracket of the auxiliary boom. The left-right swing of the wire rope on the drum causes the rope guide pulley to swing left-right along the pulley shaft, ensuring that the rope entry angle on the drum does not exceed the standard and preventing the rope from becoming tangled. The function of the rope stop bar is to prevent the wire rope from detaching from the pulley groove.
[0039] like Figure 8 As shown, to prevent overloading of the auxiliary crane and ensure safety, the support frame is hinged to the base via a pin. The winch and the support frame can rotate together around the pin. The base is mounted to the auxiliary crane column via the pin. Under the tension of the wire rope, the winch and the transition support rotate clockwise together, compressing the spring washers. When the wire rope tension reaches its rated value, the limit switch mounted on the support frame contacts the base and is triggered. The triggering of the limit switch cuts off the upward lifting action of the auxiliary crane, thus ensuring that the auxiliary crane is not overloaded and guaranteeing safety.
[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0041] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A safety type auxiliary boom hoisting structure for a tower crane, which is installed between a hoisting mechanism and a luffing mechanism, characterized in that, The device includes a column, which is rotatably mounted on a counterweight arm about its axis. An auxiliary base arm is mounted on the top of the column, and an extension arm is movably mounted on the auxiliary base arm along its extension direction. An auxiliary winch is also provided on the top of the column. The wire rope of the auxiliary winch passes through a rope laying pulley, a steering pulley, and a fixed pulley in sequence before being connected to an auxiliary hook. The rope laying pulley is mounted on the auxiliary base arm, the steering pulley is mounted on the column, and the fixed pulley is mounted on the extension arm.
2. The safety-type jib auxiliary lifting structure for tower cranes according to claim 1, characterized in that, A ladder is provided on the outside of the column.
3. The safety-type jib auxiliary lifting structure for tower cranes according to claim 1, characterized in that, The auxiliary basic arm is rotatably mounted on the column.
4. The safety-type jib auxiliary lifting structure for tower cranes according to claim 1, characterized in that, The extension arm is provided with multiple mounting holes for mounting the fixed pulley.
5. The safety-type jib auxiliary lifting structure for tower cranes according to claim 1, characterized in that, The rope pulley is slidably mounted on the shaft along its axis, and both ends of the shaft are mounted to the auxiliary basic arm via connecting plates.
6. The safety-type jib auxiliary lifting structure for tower cranes according to claim 5, characterized in that, A rope-stopping bar is installed above the rope-laying pulley.
7. The safety-type jib auxiliary lifting structure for tower cranes according to claim 1, characterized in that, The auxiliary winch has a support frame at its bottom. One end of the auxiliary winch's bottom is rotatably mounted on the support frame, and the other end of the auxiliary winch's bottom is supported on the support frame by a spring washer. A limit switch is provided on one side of the spring washer at the bottom of the auxiliary winch. When the tension of the wire rope reaches the rated value, the spring washer is compressed until the bottom of the limit switch contacts the bracket, the limit switch is triggered, and the limit switch cuts off the lifting upward action to ensure that the auxiliary crane is not overloaded.