A slewing device for a tower crane

Abstract

This invention discloses a slewing device for a tower crane, including a slewing heat dissipation mechanism installed on top of a base unblocking mechanism. The base unblocking mechanism includes a load-bearing base, and a lower flange is fixedly connected to the bottom of the load-bearing base via a fixed seat. This invention relates to the field of crane slewing technology. This tower crane slewing device, by combining the base unblocking mechanism and the slewing heat dissipation mechanism, allows the grease and lubricating oil filled between the base unblocking mechanism and the slewing heat dissipation mechanism to be introduced into the liquid storage ring groove for cooling when the two first motors drive the gear cylinder to rotate, thereby driving the slewing heat dissipation mechanism to rotate. Then, the cooled grease is re-pressed into the outer shaft ring, inner shaft gear ring, and gear cylinder through the auger blades and return pipe, ensuring smooth and stable rotation between the base unblocking mechanism and the slewing heat dissipation mechanism.

Description

Technical Field

[0001] This invention relates to the field of crane slewing technology, specifically to a slewing device for a tower crane. Background Technology

[0002] Tower cranes, as core heavy equipment in the modern construction field, are widely used in construction scenarios such as high-rise buildings, bridge projects, industrial plants, and large stadiums. Their slewing mechanism is a key functional component that enables horizontal slewing of the boom, precise positioning of materials, and continuous hoisting operations, directly determining the tower crane's operating efficiency, operational stability, positioning accuracy, and overall safety and reliability.

[0003] Currently, conventional tower crane slewing devices generally adopt a structure of motor drive, gear meshing transmission, and inner and outer shaft rings and bearing support. Lubrication is achieved by filling friction pairs such as gear meshing pairs, shaft ring mating surfaces, and bearing raceways with grease or lubricating oil to reduce friction, noise, buffer, and protect the structure. However, with the rapid development of construction projects towards super high-rise buildings, large spans, and heavy loads, the rated lifting capacity, working radius, and slewing frequency of tower cranes are continuously increasing. The slewing device is subjected to harsh conditions of heavy load, impact, continuous start-stop, and alternating forward and reverse rotation for extended periods, revealing a series of insurmountable technical defects: 1. Insufficient heat dissipation capacity leads to high-temperature failure of the lubricating medium. During high-frequency meshing and heavy-load rotation, the mating surfaces of the gear cylinder, inner shaft gear ring, and outer shaft ring generate a large amount of frictional heat, causing the internal temperature to rise rapidly. Conventional structures rely solely on natural heat dissipation from the casing, lacking a dedicated heat exchange and cooling structure. This prevents the rapid removal of heat, resulting in problems such as a sudden drop in grease viscosity, oil film rupture, oxidation and deterioration, and coking and carbon buildup. The lubricating performance deteriorates drastically, failing to form an effective load-bearing oil film. This further exacerbates tooth surface wear, bearing pitting, and shaft ring jamming, leading to malfunctions such as rotational vibration, abnormal noise, positioning deviation, and sluggish movement. This significantly shortens the equipment's service life and increases construction safety risks.

[0004] 2. The lack of a circulation loop for the lubricating medium results in low utilization and cumbersome maintenance. Existing rotary devices mostly use a one-time filling and passive wear-out lubricating medium system, lacking a closed-loop circulation system for collection, cooling, filtration, and return. High-temperature-exhausted grease cannot be discharged and cooled in time, continuously stagnating between friction pairs and creating a vicious cycle. Simultaneously, fresh lubricating medium is difficult to supply evenly to critical meshing parts, easily leading to localized dry friction due to insufficient lubrication. Equipment maintenance requires shutdown, disassembly, manual refilling, and cleaning of waste grease, which is not only costly and time-consuming but also severely impacts construction progress, failing to meet the requirements for continuous operation.

[0005] 3. Lubrication channels are prone to blockage, and there is no automatic unblocking mechanism. During long-term operation, metal shavings, dust, and aged gum generated by gear and bearing wear will mix with the lubricating grease and deposit in the bottom of the device's inner cavity and lubrication channels, causing blockage of the nozzle, fluid guide channel, and oil supply hole, resulting in interruption of lubrication medium supply. Traditional structures lack built-in cleaning and unblocking mechanisms, relying solely on manual disassembly for unblocking. This is complex, unsafe, and cannot be unblocked in real time during operation, making it highly susceptible to serious malfunctions such as dry grinding and burning, and rotational jamming due to blockage.

[0006] 4. Uneven lubrication distribution and increased risk of oil shortage due to centrifugal force: When the rotary device rotates at high speed, the grease accumulates on the outside under the action of centrifugal force. Critical locations such as the inner gear meshing area and shaft mating surfaces are prone to lubrication deficiency, resulting in localized dry friction and further aggravating temperature rise and wear. At the same time, conventional devices lack forced material return and uniform liquid distribution structures, making it impossible to accurately deliver the lubricating medium to the friction pair surfaces, significantly reducing the lubrication effect.

[0007] Therefore, a new type of rotary device integrating automatic heat dissipation, lubrication circulation, real-time unblocking, and uniform oil supply is designed to solve these defects. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a slewing device for tower cranes, which solves the problems of low lubrication and easy degradation of functionality due to high temperatures in existing slewing devices.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a slewing device for a tower crane, comprising a slewing heat dissipation mechanism installed on the top of a base unblocking mechanism. The base unblocking mechanism includes a load-bearing base, the bottom of which is fixedly connected to a lower flange via a fixed seat. A first threaded cylinder is fixedly connected to the outer periphery of the top of the load-bearing base through an opening, and several first threaded cylinders are arranged in a ring. A first bolt is threadedly connected to the inner side of each first threaded cylinder. A double-edged shovel is fixedly installed on the surface of the first threaded cylinder via a bracket. A first magnetic block is fixedly installed on the top of the inner side of the double-edged shovel. The slewing heat dissipation mechanism includes an outer protective frame, which is rotatably connected to the outer periphery of the load-bearing base.

[0010] Preferably, an outer shaft ring and an inner shaft gear ring are respectively provided on the inner side of the outer protective frame, and the outer shaft ring and the inner shaft gear ring are rotatably connected. The bottom of the inner shaft gear ring is provided with a lower threaded hole for use with the first threaded cylinder and the first bolt, and the top of the first bolt extends to the inner side of the lower threaded hole. A liquid-cooling frame is fixedly connected to the outer periphery of the bottom of the outer protective frame. A second threaded cylinder is fixedly installed on the outer periphery of the top of the outer protective frame by opening an opening, and several second threaded cylinders are arranged in a ring. The top of the outer shaft ring is provided with an upper threaded hole for use with the second threaded cylinder, and a second bolt is threadedly connected to the inner side of the second threaded cylinder and the upper threaded hole.

[0011] Preferably, the bottom of the outer protective frame is fixedly mounted with an upper flange by a bracket, and the front and rear sides of the top of the outer protective frame are both fixedly mounted with a first motor by a bracket. The output shaft of the first motor is fixedly connected to a first rotating rod by a coupling. The bottom end of the first rotating rod passes through the outer protective frame and extends to the inside of the outer protective frame. A gear cylinder is fixedly connected to one end of the first rotating rod that extends into the outside of the outer protective frame. The two gear cylinders respectively mesh with the two sides of the inner side of the inner shaft gear ring.

[0012] Preferably, the liquid-conducting cooling frame has a liquid storage ring groove and a heat exchange ring groove inside. A heat exchange conduit is installed between the inner sides of the liquid storage ring groove and the heat exchange ring groove through an opening. One end of the heat exchange conduit passes through the liquid-conducting cooling frame and extends to the outside of the liquid-conducting cooling frame. The surface of the liquid-conducting cooling frame has an air inlet groove that communicates with the heat exchange ring groove. Several air inlet grooves are provided. An air-guiding baffle that cooperates with the heat exchange conduit is fixedly installed on the inner side of the air inlet groove. Both sides of the bottom of the liquid-conducting cooling frame have a liquid leakage port that communicates with the liquid storage ring groove.

[0013] Preferably, the outer periphery of the bottom of the inner cavity of the outer protective frame is provided with a flared opening that communicates with the liquid storage ring groove, and a plurality of flared openings are arranged in a ring. Sliding inner grooves are provided on both sides of the inner cavity of the flared opening. A guide post is installed on the inner side of the flared opening and is slidably connected to the sliding inner groove. The guide post is in contact with the inner wall of the flared opening. A second magnetic block that cooperates with the first magnetic block is fixedly connected to the top of the guide post. A plurality of double-edged shovels are attached to the bottom of the inner cavity of the outer protective frame.

[0014] Preferably, a liquid distribution ring tube is fixedly installed on the top of the inner cavity of the outer protective frame by a bracket, and drip outlets are provided on both sides of the bottom of the liquid distribution ring tube to cooperate with the outer shaft ring, the inner shaft gear ring and the gear cylinder.

[0015] Preferably, both sides of the bottom of the liquid-cooling frame are fixedly connected to receiving ladder frames that cooperate with the bottom of the liquid leakage port. The bottom of the receiving ladder frame is fixedly connected to a conveying cylinder. A second motor is fixedly installed at the opposite ends of the two conveying cylinders through a bracket. The output shaft of the second motor is fixedly connected to a second rotating rod through a coupling. One end of the second rotating rod passes through the conveying cylinder and extends to the inner side of the conveying cylinder. An auger blade is fixedly installed on the surface of the second rotating rod and located on the inner side of the conveying cylinder.

[0016] Preferably, a return pipe is fixedly installed at the bottom of the conveying cylinder through an opening, and the end of the return pipe away from the conveying cylinder passes through the outer protective frame and is connected to the liquid distribution ring pipe.

[0017] This invention provides a slewing device for a tower crane. Compared with existing technologies, it has the following advantages: (1) The slewing device of the tower crane combines the base unblocking mechanism and the slewing heat dissipation mechanism. The two mechanisms are designed so that when the two first motors drive the gear cylinder to rotate and drive the slewing heat dissipation mechanism to rotate, the grease and lubricating oil filled between the base unblocking mechanism and the slewing heat dissipation mechanism can be introduced into the liquid storage ring groove for cooling. Then, the cooled grease is re-pressed into the outer shaft ring, inner shaft gear ring and gear cylinder through the auger blades and return pipe, ensuring the smoothness and stability of the rotation between the base unblocking mechanism and the slewing heat dissipation mechanism.

[0018] (2) The slewing device of the tower crane is equipped with a liquid storage ring groove and a heat exchange ring groove inside the liquid cooling frame, and is used in conjunction with heat exchange pipes and air induced baffles. When the grease enters the liquid storage ring groove, the top boom rotates with the slewing heat dissipation mechanism, so that the liquid cooling frame can also rotate. At this time, the air induced baffle can introduce the external air into the heat exchange ring groove through the air inlet groove, thereby cooling the grease in the liquid storage ring groove. The heat exchange pipe can facilitate air guidance and increase the contact area with the grease, thereby effectively improving the heat dissipation efficiency. Furthermore, the auger blades and drip outlets can drip the grease that has been cooled back into the equipment, preventing the temperature from getting too high and losing its lubrication function.

[0019] (3) The slewing device of the tower crane has several double-edged shovels installed on the edge side of the top of the load-bearing base, and a first magnetic block installed at the bottom of the double-edged shovels. It is used in conjunction with the guide column and the second magnetic block. When the slewing heat dissipation mechanism rotates, the stationary double-edged shovels can scrape and push the grease at the bottom of the inner cavity of the outer protective frame, which improves the flow rate. Whenever the first magnetic block reaches the top of the flared nozzle, it can generate magnetic attraction with the second magnetic block, so that the guide column can continuously vibrate up and down to clear the flared nozzle, thereby avoiding grease blockage and improving the stability of equipment operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the base unblocking mechanism and the rotary heat dissipation mechanism of the present invention; Figure 3 For the present invention Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the base unblocking mechanism structure of the present invention; Figure 5 This is a schematic diagram of the double-edged shovel and the first magnetic block structure of the present invention; Figure 6 This is a schematic diagram of the rotary heat dissipation mechanism structure of the present invention; Figure 7 This is a cross-sectional view of the outer protective frame structure of the present invention; Figure 8 This is a schematic diagram of the outer shaft ring, inner shaft gear ring, and upper threaded hole structure of the present invention. Figure 9 This is a schematic diagram of the liquid separation ring tube and drip outlet structure of the present invention; Figure 10 This is a cross-sectional view of the outer protective frame and liquid-conducting cooling frame structure of the present invention; Figure 11 For the present invention Figure 10 A magnified view of a section at point B in the middle; Figure 12 This is a cross-sectional view of the material conveying cylinder structure of the present invention.

[0021] In the diagram: 1. Base unblocking mechanism; 2. Rotary heat dissipation mechanism; 101. Load-bearing base; 102. Lower flange; 103. First threaded cylinder; 104. First bolt; 105. Double-edged shovel; 106. First magnetic block; 201. Outer protective frame; 202. Liquid cooling frame; 203. Outer shaft ring; 204. Inner shaft gear ring; 205. Upper threaded hole; 206. Lower threaded hole; 207. Second threaded cylinder; 208. Second bolt; 209. Upper flange; 210. First motor; 211. ... 1. Rotating rod; 212. Gear cylinder; 213. Liquid storage ring groove; 214. Heat exchange ring groove; 215. Air inlet groove; 216. Air induced baffle; 217. Heat exchange duct; 218. Leakage bottom port; 219. Expanded nozzle; 220. Sliding inner groove; 221. Guide column; 222. Liquid distribution ring pipe; 223. Drip outlet; 224. Material receiving ladder frame; 225. Material conveying cylinder; 226. Second motor; 227. Second rotating rod; 228. Screwdriver blade; 229. Return material bend; 230. Second magnetic block. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1-12 The present invention provides a technical solution: a slewing device for a tower crane, including a slewing heat dissipation mechanism 2 installed on the top of the base unblocking mechanism 1; Please refer to Figure 4 and Figure 5 The diagram shows the overall structure of the base unblocking mechanism 1. The base unblocking mechanism 1 includes a load-bearing base 101. The bottom of the load-bearing base 101 is fixedly connected to a lower flange 102 via a fixed seat. The outer periphery of the top of the load-bearing base 101 is fixedly connected to a first threaded cylinder 103 through an opening. Several first threaded cylinders 103 are arranged in a ring. The inner side of the first threaded cylinder 103 is threadedly connected to a first bolt 104. A double-edged shovel 105 is fixedly installed on the surface of the first threaded cylinder 103 via a bracket. A first magnetic block 106 is fixedly installed on the top of the inner side of the double-edged shovel 105. The first magnetic block 106 is a permanent magnet with the magnetic poles facing downwards. It is used to form a periodic magnetic attraction with the second magnetic block 230 at the top of the guide column 221 to realize automatic triggering of the unblocking action. The rotary heat dissipation mechanism 2 includes an outer protective frame 201, and the outer protective frame 201 is rotatably connected to the outer periphery of the load-bearing base 101. Please refer to Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 The diagram shows the overall structure of the rotary heat dissipation mechanism 2. The outer protective frame 201 has an outer shaft ring 203 and an inner shaft gear ring 204 on its inner side, and the outer shaft ring 203 and the inner shaft gear ring 204 are rotatably connected. The bottom of the inner shaft gear ring 204 has a lower threaded hole 206 that is used to cooperate with the first threaded cylinder 103 and the first bolt 104. The top of the first bolt 104 extends to the inner side of the lower threaded hole 206. The outer periphery of the bottom of the outer protective frame 201 is fixedly connected to a liquid cooling frame 202. The outer periphery of the top of the outer protective frame 201 is fixedly installed with a second threaded cylinder 207 through an opening. Several second threaded cylinders 207 are arranged in a ring. The top of the outer shaft ring 203 has an upper threaded hole 205 that is used to cooperate with the second threaded cylinder 207. The inner side of the second threaded cylinder 207 and the upper threaded hole 205 are threadedly connected to the second bolt 208. The bottom of the outer protective frame 201 is fixedly mounted with an upper flange 209 by a bracket. The front and rear sides of the top of the outer protective frame 201 are both fixedly mounted with a first motor 210 by a bracket. The first motor 210 is a servo motor. The output shaft of the first motor 210 is fixedly connected to a first rotating rod 211 by a coupling. The bottom end of the first rotating rod 211 passes through the outer protective frame 201 and extends to the inside of the outer protective frame 201. A gear cylinder 212 is fixedly connected to one end of the first rotating rod 211 that extends into the outer protective frame 201. The two gear cylinders 212 mesh with the two sides of the inner side of the inner shaft gear ring 204 respectively. The liquid-cooling frame 202 has a liquid storage ring groove 213 and a heat exchange ring groove 214 respectively. A heat exchange conduit 217 is installed between the inner sides of the liquid storage ring groove 213 and the heat exchange ring groove 214 through an opening. One end of the heat exchange conduit 217 passes through the liquid-cooling frame 202 and extends to the outside of the liquid-cooling frame 202. The surface of the liquid-cooling frame 202 has an air inlet groove 215 that communicates with the heat exchange ring groove 214. Several air inlet grooves 215 are provided. An air-guiding baffle 216 that works with the heat exchange conduit 217 is fixedly installed on the inner side of the air inlet groove 215. Both sides of the bottom of the liquid-cooling frame 202 have a liquid leakage bottom port 218 that communicates with the liquid storage ring groove 213. The outer periphery of the bottom of the inner cavity of the outer protective frame 201 is provided with a flared opening 219 that communicates with the liquid storage ring groove 213, and several flared openings 219 are arranged in a ring. Sliding inner grooves 220 are provided on both sides of the inner cavity of the flared openings 219. A guide post 221 is installed on the inner side of the flared openings 219 and is slidably connected to the sliding inner groove 220. The guide post 221 is in contact with the inner wall of the flared openings 219. A second magnetic block 230 that cooperates with the first magnetic block 106 is fixedly connected to the top of the guide post 221. Several double-edged shovels 105 are fitted against the bottom of the inner cavity of the outer protective frame 201. A liquid distribution ring pipe 222 is fixedly installed on the top of the inner cavity of the outer protective frame 201 by a bracket. Drip outlets 223 that cooperate with the outer shaft ring 203, the inner shaft gear ring 204, and the gear cylinder 212 are provided on both sides of the bottom of the liquid distribution ring pipe 222. Both sides of the bottom of the liquid cooling frame 202 are fixedly connected to receiving ladder frames 224 that cooperate with the liquid leakage bottom port 218. The bottom of the receiving ladder frame 224 is fixedly connected to a conveying cylinder 225. The two conveying cylinders 225 are fixedly installed with a second motor 226 through a bracket at opposite ends. The second motor 226 is a servo motor. The output shaft of the second motor 226 is fixedly connected to a second rotating rod 227 through a coupling. One end of the second rotating rod 227 passes through the conveying cylinder 225 and extends to the inside of the conveying cylinder 225. The surface of the second rotating rod 227 and the inside of the conveying cylinder 225 are fixedly installed with an auger blade 228. A return pipe 229 is fixedly installed at the bottom of the conveying cylinder 225 through an opening. The end of the return pipe 229 away from the conveying cylinder 225 passes through the outer protective frame 201 and is connected to the liquid distribution ring pipe 222.

[0024] Before use, the lower flange 102 is installed on the top of the tower body using a threaded assembly. Then, the lifting boom is installed on the top of the upper flange 209 using the same threaded assembly. During use, the control room simultaneously starts the two first motors 210. The first rotating rod 211 drives the two gear cylinders 212 to rotate synchronously. The outer shaft ring 203 is fixed to the tower body via the lower flange 102 and does not rotate. At this time, the meshing rotation of the gear cylinder 212 and the inner shaft gear ring 204 will drive the entire outer protective frame 201 and the lifting boom to rotate together. When the outer protective frame 201 rotates, due to the large size of the outer shaft ring 203, the inner shaft gear ring 204, and the gear cylinder 212, a high temperature will be generated. Under high temperature conditions, the internal... The grease is melted into a liquid state, then drips and flows to the outer periphery of the bottom of the inner cavity of the outer protective frame 201 through the guide of the outer protective frame 201. Subsequently, when the liquid grease flows to the flared nozzle 219, it is guided into the inner side of the liquid storage ring groove 213. The rotation of the outer protective frame 201 causes several double-edged scrapers 105 that are in contact with the inner wall to scrape the grease, thereby pushing the grease to flow into the flared nozzle 219 more quickly. And whenever the double-edged scrapers 105 are at the flared nozzle 219, the grease flows into the flared nozzle 219 more quickly. When the grease is directly above the 9th magnetic point, the first magnetic block 106 at the bottom will magnetically attract the second magnetic block 230, thereby pulling the guide column 221 upward to clear the flare opening 219. Simultaneously, as the outer protective frame 201 drives the liquid-cooling frame 202 to rotate in both directions, the air-guiding baffle 216 continuously guides external cold air into the heat exchange ring groove 214, which then passes through the heat exchange conduit 217. This increases the contact area with the grease through the heat exchange conduit 217, allowing for rapid heat dissipation of the grease. When the grease flows to the bottom of the drain 218 and enters the conveying cylinder 225 through the receiving ladder frame 224, the second motor 226 drives the second rotating rod 227 and the auger blade 228 to rotate, continuously squeezing and conveying the grease. This forces the grease through the return bend 229 into the inner side of the liquid distribution ring pipe 222, and then discharges through the drip outlet 223, falling between the outer shaft ring 203, the inner shaft gear ring 204, and the gear cylinder 212, thus improving its lubrication effect.

[0025] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

Claims

1. A slewing device of a tower crane, comprising a slewing gear (2) mounted on top of a base gear (1), characterized in that: The base unblocking mechanism (1) includes a load-bearing base (101). The bottom of the load-bearing base (101) is fixedly connected to a lower flange (102) via a fixed seat. The outer periphery of the top of the load-bearing base (101) is fixedly connected to a first threaded cylinder (103) through an opening. Several first threaded cylinders (103) are arranged in a ring. The inner side of the first threaded cylinder (103) is threaded with a first bolt (104). The surface of the first threaded cylinder (103) is fixedly mounted with a double-edged shovel plate (105) via a bracket. The top of the inner side of the double-edged shovel plate (105) is fixedly mounted with a first magnetic block (106). The rotary heat dissipation mechanism (2) includes an outer protective frame (201), and the outer protective frame (201) is rotatably connected to the outer periphery of the load-bearing base (101).

2. A slewing gear for a tower crane according to claim 1, characterized in that The outer protective frame (201) has an outer shaft ring (203) and an inner shaft gear ring (204) respectively on its inner side, and the outer shaft ring (203) and the inner shaft gear ring (204) are rotatably connected. The bottom of the inner shaft gear ring (204) is provided with a lower threaded hole (206) for use with the first threaded cylinder (103) and the first bolt (104), and the top of the first bolt (104) extends to the inner side of the lower threaded hole (206). The bottom of the outer protective frame (201) A liquid cooling frame (202) is fixedly connected to the outer periphery of the outer protective frame (201). A second threaded cylinder (207) is fixedly installed on the outer periphery of the top of the outer protective frame (201) through an opening. Several second threaded cylinders (207) are arranged in a ring. The top of the outer shaft ring (203) is provided with an upper threaded hole (205) that cooperates with the second threaded cylinder (207). A second bolt (208) is threadedly connected to the inner side of the second threaded cylinder (207) and the upper threaded hole (205).

3. A slewing gear for a tower crane according to claim 2, characterized in that The bottom of the outer protective frame (201) is fixedly mounted with an upper flange (209) by a bracket. The front and rear sides of the top of the outer protective frame (201) are both fixedly mounted with a first motor (210) by a bracket. The output shaft of the first motor (210) is fixedly connected to a first rotating rod (211) by a coupling. The bottom end of the first rotating rod (211) passes through the outer protective frame (201) and extends to the inner side of the outer protective frame (201). One end of the first rotating rod (211) extending into the outer protective frame (201) is fixedly connected with a gear cylinder (212). The two gear cylinders (212) respectively mesh with the two sides of the inner side of the inner shaft gear ring (204).

4. A slewing gear for a tower crane according to claim 3, characterized in that: The liquid-conducting cooling frame (202) has a liquid storage ring groove (213) and a heat exchange ring groove (214) respectively. A heat exchange conduit (217) is installed between the inner sides of the liquid storage ring groove (213) and the heat exchange ring groove (214) through an opening. One end of the heat exchange conduit (217) passes through the liquid-conducting cooling frame (202) and extends to the outside of the liquid-conducting cooling frame (202). The surface of the liquid-conducting cooling frame (202) has an air inlet groove (215) that communicates with the heat exchange ring groove (214). There are several air inlet grooves (215). An air-guiding baffle (216) that works with the heat exchange conduit (217) is fixedly installed on the inner side of the air inlet groove (215). Both sides of the bottom of the liquid-conducting cooling frame (202) have a liquid leakage bottom port (218) that communicates with the liquid storage ring groove (213).

5. A slewing gear for a tower crane according to claim 4, characterized in that: The outer periphery of the bottom of the inner cavity of the outer protective frame (201) is provided with a flared opening (219) that communicates with the liquid storage ring groove (213), and several flared openings (219) are arranged in a ring. Sliding inner grooves (220) are provided on both sides of the inner cavity of the flared opening (219). A guide post (221) that is slidably connected to the sliding inner groove (220) is installed on the inner side of the flared opening (219), and the guide post (221) is in contact with the inner wall of the flared opening (219). A second magnetic block (230) that cooperates with the first magnetic block (106) is fixedly connected to the top of the guide post (221). Several double-edged shovels (105) are attached to the bottom of the inner cavity of the outer protective frame (201).

6. A slewing gear for a tower crane according to claim 5, characterized in that: The top of the inner cavity of the outer protective frame (201) is fixedly installed with a liquid distribution ring pipe (222) by a bracket. Both sides of the bottom of the liquid distribution ring pipe (222) are provided with drip outlets (223) that cooperate with the outer shaft ring (203), the inner shaft gear ring (204) and the gear cylinder (212).

7. A slewing gear for a tower crane according to claim 6, characterized in that Both sides of the bottom of the liquid-cooling frame (202) are fixedly connected to receiving ladder frames (224) that cooperate with the liquid leakage bottom port (218). The bottom of the receiving ladder frame (224) is fixedly connected to a conveying cylinder (225). The two conveying cylinders (225) are fixedly mounted with a second motor (226) through a bracket at opposite ends. The output shaft of the second motor (226) is fixedly connected to a second rotating rod (227) through a coupling. One end of the second rotating rod (227) passes through the conveying cylinder (225) and extends to the inside of the conveying cylinder (225). The surface of the second rotating rod (227) and the inside of the conveying cylinder (225) are fixedly mounted with auger blades (228).

8. The slewing device of a tower crane according to claim 7, characterized in that: The bottom of the conveying cylinder (225) is fixedly installed with a return pipe (229) through an opening. The end of the return pipe (229) away from the conveying cylinder (225) passes through the outer protective frame (201) and is connected to the liquid distribution ring pipe (222).

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