Ocean platform crane slewing tower body

Abstract

The invention discloses a slewing tower body of an ocean platform crane, which relates to the technical field of cranes and comprises a mounting base, a slewing platform rotationally arranged at the top of the mounting base, a fixed gear fixedly arranged between the mounting base and the slewing platform, and a slewing gear meshed with one side of the fixed gear, a side annular plate is fixedly installed on the edge of the bottom end of the upper protective shell, a dust screen is arranged in the ventilation groove, a cleaning assembly is arranged in the side annular plate, four auxiliary assemblies corresponding to the dust screen are arranged in the top end of the lower protective shell, and four adjusting assemblies corresponding to the dust screen are arranged at the top of the outer side of the lower protective shell. Through the arranged cleaning assembly, a cleaning brush can clean dust attached to the exterior of the dustproof net in an up-down moving mode, the effect of cleaning the dust in the dustproof net is improved, and the situation that the dustproof net is blocked due to the fact that much dust is attached to the exterior of the dustproof net is avoided; and therefore, the heat of the rotary gear and the fixed gear can be discharged during working.

Description

Technical Field

[0001] The invention relates to the technical field of cranes, and in particular to a revolving tower body of an offshore platform crane. Background Art

[0002] Tower crane is the most commonly used lifting equipment on construction sites. It is also known as "tower crane". It is connected (heightened) section by section and is used to lift construction materials such as steel bars, wooden slats, concrete, steel pipes, etc.

[0003] The slewing tower body is the most important component of the tower crane. It mainly provides steering after the tower crane lifts the object and realizes the transfer of the object. The rotation of the slewing tower body is achieved by the cooperation of a large gear and a small gear. In the existing slewing tower body, the two matching gears are exposed to the outside. Due to the harsh environment at the construction site, a lot of dust will adhere to the gears under long-term working conditions, which will affect the service life of the gears. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a slewing tower body of an offshore platform crane.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a slewing tower body of an offshore platform crane, comprising a mounting base, a slewing platform rotatably arranged on the top of the mounting base, a fixed gear fixedly arranged between the mounting base and the slewing platform, and a slewing gear meshed with one side of the fixed gear, a lower protective shell is fixedly installed on the top of the mounting base, an upper protective shell is fixedly installed on the bottom of the slewing platform, the lower protective shell and the upper protective shell are rotatably connected through a bearing, a side ring plate is fixedly installed on the edge of the bottom end of the upper protective shell, four evenly distributed ventilation slots are opened inside the lower protective shell, a dustproof net is arranged inside the ventilation slot, a cleaning component is arranged inside the side ring plate, four auxiliary components corresponding to the dustproof net are arranged inside the top end of the lower protective shell, and four adjustment components corresponding to the dustproof net are arranged on the top of the outer side of the lower protective shell; The cleaning assembly comprises a cleaning ring plate slidably arranged inside the side ring plate, a plurality of evenly distributed cleaning brushes are fixedly arranged on one side of the cleaning ring plate close to the fixed gear, a plurality of evenly distributed first springs are arranged between the top of the cleaning ring plate and the inner wall of the side ring plate, a plurality of evenly distributed push blocks are fixedly arranged on the bottom of the cleaning ring plate, and a plurality of evenly distributed first top blocks are fixedly installed on the edge of the top end of the lower protective shell; The auxiliary component includes a cavity opened in the lower protective shell, a piston is slidably arranged inside the cavity, a plurality of evenly distributed push rods are fixedly arranged on the top of the piston, a second spring is sleeved on the outside of the push rod, a plurality of air outlets and a plurality of air inlet holes are respectively connected to the bottoms of both sides of the cavity, a one-way valve is arranged inside the air outlet and the air inlet, a hose is connected to one side of the air outlet, an end of the hose away from the air outlet is connected to a nozzle, and a plurality of evenly distributed second top blocks are fixedly arranged on the bottom of the upper protective shell.

[0006] Preferably, the adjustment assembly includes a bracket fixedly connected to the lower protective shell, a plurality of swing plates are rotatably arranged at the bottom of the bracket, a plurality of sliding rods are fixedly arranged inside the bracket, a connecting support plate is slidably arranged outside the sliding rods, the nozzle is fixedly arranged at the bottom of the connecting support plate, a third spring is arranged between the bottom of the connecting support plate and the inner wall of the bracket, a pressure plate is fixedly arranged on the side of the connecting support plate away from the lower protective shell, and an adjustment ring plate matching the swing plate is fixedly arranged on the top of the inner wall of the cleaning ring plate.

[0007] Preferably, the distance between the rotation center of the swing plate and the adjusting ring plate is smaller than the distance between the rotation center of the swing plate and the pressing plate.

[0008] Preferably, a plurality of evenly distributed through holes are formed inside the cleaning ring plate, and the through holes and the cleaning brushes are arranged alternately.

[0009] Preferably, the number of the first top blocks and the push blocks is the same, and the positions of the first top blocks and the push blocks correspond.

[0010] Preferably, the cavity is arranged above the dustproof net, and the gaps between two adjacent second top blocks and two adjacent top rods are the same.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. The cleaning assembly provided in the present invention enables the cleaning brush to move up and down to clean the dust attached to the outside of the dustproof net, which is beneficial to improving the dust cleaning effect in the dustproof net and avoiding the clogging of the dustproof net caused by a large amount of dust attached to the outside of the dustproof net, thereby ensuring the heat discharge of the rotating gear and the fixed gear during operation.

[0012] 2. The present invention provides an auxiliary component, and when the upper protective shell rotates, the wind sprayed from the jet head acts on the dustproof net, which can blow off part of the dust attached to the surface of the dustproof net, further improving the dust cleaning effect of the dustproof net.

[0013] 3. The present invention provides an adjustment component, so that when the upper protective shell rotates, the swing plate pushes the pressure plate and the connecting support plate to move downward, and the connecting support plate drives the jet head to move downward, thereby increasing the area of ​​the jet head acting on the dustproof net, which is beneficial to improving the cleaning effect of the dustproof net.

[0014] 4. The present invention drives the cleaning component, the auxiliary component and the adjusting component through the rotation of the rotating platform. No external drive is required, which is beneficial to saving resources. When the fixed gear and the rotating gear generate heat during operation, the cleaning component, the auxiliary component and the adjusting component clean the dust net to ensure the unobstructed operation of the dust net and the discharge of the fixed gear and the rotating gear. When the fixed gear and the rotating gear are not operating, the cleaning component, the auxiliary component and the adjusting component are all stopped from use, and there is no need to clean the dust net. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a schematic diagram of the appearance structure of the present invention; Figure 2 It is a front structural schematic diagram of the present invention; Figure 3 It is a partial front cross-sectional structural schematic diagram of the present invention; Figure 4 It is a schematic diagram of the structure of the mounting base and the rotating platform of the present invention; Figure 5 It is a partial front cross-sectional structural schematic diagram of the present invention; Figure 6 It is a partial front cross-sectional structural schematic diagram of the lower protective shell of the present invention; Figure 7 A is a schematic diagram of a local enlarged structure of the present invention; Figure 8 It is a schematic diagram of a partial front cross-sectional structure of a side ring plate of the present invention; Fig. 9 It is a schematic diagram of a partially unfolded structure of a cleaning ring plate of the present invention; Fig.10 It is a schematic diagram of the partial unfolded structure of the auxiliary component of the present invention.

[0016] The serial numbers in the figure are: 1, mounting base; 2, rotating platform; 3, fixed gear; 4, rotating gear; 5, lower protective shell; 6, upper protective shell; 7, side ring plate; 8, ventilation slot; 9, dust screen; 10, cleaning component; 1001, cleaning ring plate; 1002, cleaning brush; 1003, first spring; 1004, push block; 1005, first top block; 11, through hole; 12, auxiliary component; 1201, Cavity; 1202, piston; 1203, push rod; 1204, second spring; 1205, air outlet; 1206, air inlet; 1207, hose; 1208, nozzle; 13, second top block; 14, adjustment assembly; 1401, bracket; 1402, swing plate; 1403, slide rod; 1404, connecting support plate; 1405, third spring; 1406, pressure plate; 15, adjustment ring plate. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] Example: See Figure 1-10A slewing tower body of an offshore platform crane comprises a mounting base 1, a slewing platform 2 rotatably arranged on the top of the mounting base 1, a fixed gear 3 fixedly arranged between the mounting base 1 and the slewing platform 2, and a slewing gear 4 meshed with one side of the fixed gear 3. A motor is arranged on the top of the slewing platform 2, and the output shaft of the motor is rotatably arranged inside the slewing platform 2. The slewing gear 4 is fixedly arranged at the bottom of the motor output shaft. A lower protective shell 5 is fixedly installed on the top of the mounting base 1, and an upper protective shell 6 is fixedly installed on the bottom of the slewing platform 2. The lower protective shell 5 and the upper protective shell 6 are rotatably connected through a bearing. A side ring plate 7 is fixedly installed on the edge of the bottom end of the upper protective shell 6. Four evenly distributed ventilation slots 8 are opened inside the lower protective shell 5. The heat generated between the slewing gear 4 and the fixed gear 3 can be discharged to the outside through the ventilation slots 8, which is beneficial to improving the service life of the slewing gear 4 and the fixed gear 3. A dustproof net 9 is arranged inside the ventilation slot 8. The dustproof net 9 is arranged to block external dust and prevent external dust from entering the upper protective shell. A cleaning assembly 10 is arranged inside the protective shell 6 and the lower protective shell 5, and inside the side ring plate 7. Four auxiliary assemblies 12 corresponding to the dustproof net 9 are arranged inside the top of the lower protective shell 5, and four adjusting assemblies 14 corresponding to the dustproof net 9 are arranged on the top of the outer side of the lower protective shell 5. The cleaning assembly 10, the auxiliary assembly 12 and the adjusting assembly 14 are driven by the rotation of the rotating platform 2. No external drive is required, which is conducive to saving resources. When the rotating platform 2 stops rotating, the cleaning assembly 10, the auxiliary assembly 12 and the adjusting assembly 14 are stopped from use, and no additional device is required to control the cleaning assembly 10, the auxiliary assembly 12 and the adjusting assembly 14. When the fixed gear 3 and the rotating gear 4 generate heat during operation, the cleaning assembly 10, the auxiliary assembly 12 and the adjusting assembly 14 clean the dustproof net 9 to ensure the unobstructed dustproof net 9 and the discharge of the fixed gear 3 and the rotating gear 4. When the fixed gear 3 and the rotating gear 4 are not operating, the cleaning assembly 10, the auxiliary assembly 12 and the adjusting assembly 14 are all stopped from use, and there is no need to clean the dustproof net 9. The cleaning assembly 10 includes a cleaning ring plate 1001 slidably arranged inside the side ring plate 7, a plurality of uniformly distributed cleaning brushes 1002 are fixedly arranged on one side of the cleaning ring plate 1001 close to the fixed gear 3, a plurality of uniformly distributed first springs 1003 are arranged between the top of the cleaning ring plate 1001 and the inner wall of the side ring plate 7, a plurality of uniformly distributed push blocks 1004 are fixedly arranged on the bottom of the cleaning ring plate 1001, a plurality of uniformly distributed first top blocks 1005 are fixedly installed on the edge of the top of the lower protective shell 5, the number of the first top blocks 1005 and the push blocks 1004 are the same, and the positions of the first top blocks 1005 and the push blocks 1004 correspond, when the rotary platform 2 rotates, the upper protective shell 6 rotates, and the side ring plate 7 and the cleaning ring plate 1001 rotate, so that the cleaning brush 1002 is The dust attached to the outside of the dustproof net 9 is cleaned. When the push block 1004 at the bottom of the cleaning ring plate 1001 contacts the first top block 1005, the first top block 1005 pushes the push block 1004 and the cleaning ring plate 1001 upward, and the cleaning ring plate 1001 moves upward to squeeze the first spring 1003. When the first top block 1005 and the push block 1004 are misaligned, the cleaning ring plate 1001 moves downward to reset under the action of the first spring 1003, and so on and so forth. The cleaning brush 1002 can move up and down to clean the dust attached to the outside of the dustproof net 9, which is beneficial to improving the effect of cleaning the dust in the dustproof net 9 and avoiding the clogging of the dustproof net 9 caused by a lot of dust attached to the outside of the dustproof net 9, thereby ensuring the heat discharge of the rotating gear 4 and the fixed gear 3 during operation. The auxiliary component 12 includes a cavity 1201 opened inside the lower protective shell 5, the cavity 1201 is arranged above the dustproof net 9, a piston 1202 is slidably arranged inside the cavity 1201, a plurality of evenly distributed push rods 1203 are fixedly arranged on the top of the piston 1202, a second spring 1204 is sleeved on the outside of the push rod 1203, a plurality of air outlet holes 1205 and a plurality of air inlet holes 1206 are respectively connected to the bottom of the two sides of the cavity 1201, a one-way valve is arranged inside the air outlet holes 1205 and the air inlet holes 1206, a hose 1207 is connected to one side of the air outlet hole 1205, and an end of the hose 1207 away from the air outlet hole 1205 is connected to a nozzle 1208, and the bottom of the upper protective shell 6 A plurality of evenly distributed second top blocks 13 are fixedly arranged, and the gaps between two adjacent second top blocks 13 and two adjacent top rods 1203 are the same. When the upper protective shell 6 rotates, when the second top block 13 contacts the top rod 1203, the top rod 1203 is forced to drive the piston 1202 to move downward, and the second spring 1204 is stretched. When the piston 1202 moves downward, the one-way valve inside the air outlet 1205 opens, and the one-way valve inside the air inlet 1206 closes. The gas inside the cavity 1201 passes through the air outlet 1205 and the hose 1207, and is finally sprayed to the surface of the dustproof net 9 by the nozzle 1208, which can blow off part of the dust attached to the surface of the dustproof net 9, thereby further improving the cleaning effect of the dustproof net 9.

[0019] In the present invention, the adjustment component 14 includes a bracket 1401 fixedly connected to the lower protective shell 5, a plurality of swing plates 1402 are rotatably arranged at the bottom of the bracket 1401, a plurality of slide bars 1403 are fixedly arranged inside the bracket 1401, a connecting support plate 1404 is slidably arranged outside the slide bar 1403, the jet head 1208 is fixedly arranged at the bottom of the connecting support plate 1404, a third spring 1405 is arranged between the bottom of the connecting support plate 1404 and the inner wall of the bracket 1401, a pressure plate 1406 is fixedly arranged on the side of the connecting support plate 1404 away from the lower protective shell 5, and an adjustment spring 1406 cooperating with the swing plate 1402 is fixedly arranged on the top of the inner wall of the cleaning ring plate 1001 The section ring plate 15, when the cleaning ring plate 1001 moves up and down, the adjusting ring plate 15 moves up and down. When the adjusting ring plate 15 moves upward, it pushes the swing plate 1402 to rotate around the rotation point. One end of the swing plate 1402 close to the adjusting ring plate 15 is forced to move upward, and the other end moves downward. The other end of the swing plate 1402 pushes the pressure plate 1406 and the connecting support plate 1404 to move downward. The connecting support plate 1404 moves stably along the sliding rod 1403, and the third spring 1405 is compressed. The connecting support plate 1404 drives the nozzle 1208 to move downward, thereby increasing the area of ​​the nozzle 1208 acting on the dustproof net 9, which is beneficial to improving the cleaning effect of the dustproof net 9.

[0020] In the present invention, the distance between the rotation center of the swing plate 1402 and the adjustment ring plate 15 is smaller than the distance between the rotation center of the swing plate 1402 and the pressure plate 1406. Such a setting can increase the moving distance of the connecting support plate 1404, thereby increasing the range of the nozzle 1208 acting on the dustproof net 9.

[0021] In the present invention, a plurality of evenly distributed through holes 11 are opened inside the cleaning ring plate 1001, and the through holes 11 and the cleaning brush 1002 are staggered. Through the through holes 11, air can enter the interior of the upper protective shell 6 and the lower protective shell 5 through the through holes 11, thereby increasing the area for air circulation.

[0022] Working principle: In this embodiment, the present invention also proposes a method for using a rotating tower body of an offshore platform crane, comprising the following steps: Step 1: When the motor on the top of the rotating gear 4 is driven, the rotating gear 4 rotates, and under the action of meshing with the fixed gear 3, the rotating gear 4 rotates around the fixed gear 3, thereby causing the rotating platform 2 to rotate. Under the action of the ventilation slots 8, the heat generated between the rotating gear 4 and the fixed gear 3 can be discharged to the outside through the ventilation slots 8, which is beneficial to improving the service life of the rotating gear 4 and the fixed gear 3. The dustproof net 9 is set to block the external dust and prevent the external dust from entering the upper protective shell 6 and the lower protective shell 5. Step 2, while the slewing platform 2 rotates, the upper protective shell 6 at the bottom thereof is driven to rotate. While the upper protective shell 6 rotates, the side ring plate 7 and the cleaning ring plate 1001 are driven to rotate, so that the cleaning brush 1002 cleans the dust attached to the outside of the dustproof net 9. When the push block 1004 at the bottom of the cleaning ring plate 1001 contacts the first top block 1005, the first top block 1005 pushes the push block 1004 and the cleaning ring plate 1001 upward, and the cleaning ring plate 1001 moves upward to squeeze the first spring 1003. When the first top block 1005 is misaligned with the push block 1004, the cleaning ring plate 1001 moves downward and resets under the action of the first spring 1003. This is repeated, so that the cleaning brush 1002 can move up and down to clean the dust attached to the outside of the dustproof net 9, which is beneficial to improving the effect of cleaning the dust in the dustproof net 9 and avoiding the clogging of the dustproof net 9 caused by more dust attached to the outside of the dustproof net 9, thereby ensuring the discharge of heat from the rotating gear 4 and the fixed gear 3 during operation; Step three, when the upper protective shell 6 rotates, when the second top block 13 at the bottom thereof contacts the top rod 1203, the top rod 1203 is forced to drive the piston 1202 to move downward, and the second spring 1204 is stretched. When the piston 1202 moves downward, the one-way valve inside the air outlet 1205 opens, and the one-way valve inside the air inlet 1206 closes. The gas inside the cavity 1201 passes through the air outlet 1205 and the hose 1207, and is finally sprayed to the surface of the dustproof net 9 by the nozzle 1208, which can blow off part of the dust attached to the surface of the dustproof net 9, further improving the dust cleaning effect of the dustproof net 9. When the second top block 13 is staggered with the top rod 1203, the top rod 1203 and the piston 1202 move upward and reset under the action of the second spring 1204, the one-way valve inside the air outlet 1205 is closed, the one-way valve inside the air inlet 1206 is opened, and the air enters the interior of the cavity 1201 through the air inlet 1206; Step 4, when the cleaning ring plate 1001 moves up and down, it drives the adjustment ring plate 15 connected thereto to move up and down. When the adjustment ring plate 15 moves upward, it pushes the swing plate 1402 to rotate around the rotation point. One end of the swing plate 1402 close to the adjustment ring plate 15 is forced to move upward, and the other end moves downward. The other end of the swing plate 1402 pushes the pressure plate 1406 and the connecting support plate 1404 to move downward. The connecting support plate 1404 moves stably along the slide bar 1403, and the third spring 1405 is compressed. The connecting support plate 1404 drives the jet head 1208 to move downward, increasing the area of ​​the jet head 1208 acting on the dustproof net 9, which is beneficial to improving the cleaning effect of the dustproof net 9. When the adjustment ring plate 15 moves downward, the connecting support plate 1404 drives the pressure plate 1406 and the jet head 1208 to move upward and reset under the action of the third spring 1405, and the swing plate 1402 resets synchronously.

[0023] The present invention drives the cleaning component, the auxiliary component and the adjusting component through the rotation of the rotating platform, does not need external driving, and is conducive to saving resources. When the fixed gear and the rotating gear generate heat during operation, the cleaning component, the auxiliary component and the adjusting component clean the dustproof net to ensure the unobstructed operation of the dustproof net and the discharge of the fixed gear and the rotating gear. When the fixed gear and the rotating gear are not operating, the cleaning component, the auxiliary component and the adjusting component are all stopped from use, and there is no need to clean the dustproof net.

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A slewing tower body of an offshore platform crane, comprising a mounting base (1), a slewing platform (2) rotatably arranged on the top of the mounting base (1), a fixed gear (3) fixedly arranged between the mounting base (1) and the slewing platform (2), and a slewing gear (4) meshed with one side of the fixed gear (3), characterized in that: A lower protective shell (5) is fixedly mounted on the top of the mounting base (1), an upper protective shell (6) is fixedly mounted on the bottom of the rotating platform (2), the lower protective shell (5) and the upper protective shell (6) are rotatably connected via a bearing, a side ring plate (7) is fixedly mounted on the edge of the bottom end of the upper protective shell (6), four evenly distributed ventilation slots (8) are provided inside the lower protective shell (5), a dustproof net (9) is provided inside the ventilation slot (8), a cleaning component (10) is provided inside the side ring plate (7), four auxiliary components (12) corresponding to the dustproof net (9) are provided inside the top end of the lower protective shell (5), and four adjustment components (14) corresponding to the dustproof net (9) are provided on the top of the outer side of the lower protective shell (5); The cleaning assembly (10) comprises a cleaning ring plate (1001) slidably arranged inside the side ring plate (7); a plurality of evenly distributed cleaning brushes (1002) are fixedly arranged on a side of the cleaning ring plate (1001) close to the fixed gear (3); a plurality of evenly distributed first springs (1003) are arranged between the top of the cleaning ring plate (1001) and the inner wall of the side ring plate (7); a plurality of evenly distributed push blocks (1004) are fixedly arranged on the bottom of the cleaning ring plate (1001); and a plurality of evenly distributed first top blocks (1005) are fixedly installed on the edge of the top end of the lower protective shell (5); The auxiliary component (12) comprises a cavity (1201) opened inside the lower protective shell (5), a piston (1202) is slidably arranged inside the cavity (1201), a plurality of evenly distributed push rods (1203) are fixedly arranged on the top of the piston (1202), a second spring (1204) is sleeved on the outside of the push rod (1203), the bottoms of both sides of the cavity (1201) are respectively connected to a plurality of air outlet holes (1205) and a plurality of air inlet holes (1206), a one-way valve is arranged inside each of the air outlet holes (1205) and the air inlet holes (1206), one side of the air outlet holes (1205) is connected to a hose (1207), and one end of the hose (1207) away from the air outlet holes (1205) is connected to a nozzle (1208), and a plurality of evenly distributed second push blocks (13) are fixedly arranged on the bottom of the upper protective shell (6).

2. The slewing tower of an offshore platform crane according to claim 1, characterized in that: The adjustment component (14) comprises a bracket (1401) fixedly connected to the lower protective shell (5); a plurality of swing plates (1402) are rotatably arranged at the bottom of the bracket (1401); a plurality of sliding rods (1403) are fixedly arranged inside the bracket (1401); a connecting support plate (1404) is slidably arranged outside the sliding rod (1403); the nozzle (1208) is fixedly arranged at the bottom of the connecting support plate (1404); a third spring (1405) is arranged between the bottom of the connecting support plate (1404) and the inner wall of the bracket (1401); a pressure plate (1406) is fixedly arranged on the side of the connecting support plate (1404) away from the lower protective shell (5); and an adjustment ring plate (15) matching the swing plate (1402) is fixedly arranged on the top of the inner wall of the cleaning ring plate (1001).

3. The slewing tower of an offshore platform crane according to claim 2, characterized in that: The distance between the rotation center of the swing plate (1402) and the adjustment ring plate (15) is smaller than the distance between the rotation center of the swing plate (1402) and the pressure plate (1406).

4. The slewing tower of an offshore platform crane according to claim 1, characterized in that: A plurality of evenly distributed through holes (11) are provided inside the cleaning ring plate (1001), and the through holes (11) and the cleaning brushes (1002) are arranged in an alternating manner.

5. The slewing tower of an offshore platform crane according to claim 1, characterized in that: The number of the first top blocks (1005) and the number of the push blocks (1004) are the same, and the positions of the first top blocks (1005) and the push blocks (1004) correspond to each other.

6. The slewing tower of an offshore platform crane according to claim 1, characterized in that: The cavity (1201) is arranged above the dustproof net (9), and the gaps between two adjacent second top blocks (13) and two adjacent top rods (1203) are the same.

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