Rust removal structure for tower crane pin

Abstract

A tower crane pin rust removal structure comprises a tower crane frame and pins, the pins at the two ends are exposed out of the tower crane frame, the tower crane pin rust removal structure further comprises an outer sleeve shell, a limiting piece and an extrusion frame, the outer sleeve shell comprises a shell body, a liquid supplementing hole, a shell body connecting through hole, an elastic binding belt and a binding belt fixing hole, and the limiting piece comprises a U-shaped piece body, an extrusion rod hole, a limiting nut and a limiting hole. The extrusion frame comprises an extrusion rod connecting piece, a connecting piece rod hole, an extrusion rod, an annular extrusion support, an annular sponge strip, a push rotating rod, an operation handle and a push nut. The extrusion frame is inserted into the shell, the annular sponge strip surrounds the periphery of the connecting position of the pin head and the tower crane frame, and the inner side of the pushing nut on the pushing and rotating rod abuts against the outer side of the extrusion rod connecting piece to drive the extrusion rod to extrude the annular sponge strip. The reaction time of a rust remover and a rusted part is prolonged by utilizing the rust removal device, so that the aims of fully removing rust and conveniently dismantling are fulfilled, the tower crane is convenient to manufacture and high in turnover property and utilization rate, the quick dismantling of the tower crane is realized, the construction progress is accelerated, and the construction period is shortened.

Description

Technical Field

[0001] The utility model belongs to the field of tower crane disassembly assistance, in particular to a tower crane pin rust removal device. Background Art

[0002] The connection between the standard sections of a tower crane is typically achieved through pins. Driving and removing the pins is a crucial step in the installation and dismantling of a tower crane. During dismantling, the connection between the pins and the standard sections can rust due to age and inadequate maintenance, making removal difficult. A common method is to apply a rust remover to the contact point between the pins and the crane, then use a hammer or a pin puller to remove the connection.

[0003] In order to solve the problem of rust on pins in connecting holes, the prior art, such as CN219136202U, proposes a tower crane tower structure. This tower structure changes the structure of the tower body standard section. A lubrication hole connecting the connecting locating pin, the connecting locating hole and the outside is opened on the upper main chord round steel of the upper tower body standard section. A rust remover is injected in situ through this hole at the location between the connecting locating pin and the connecting locating hole where rust is likely to occur.

[0004] However, this method revolves around vertical pins, vertical holes and horizontal lubrication holes. Once it is applied to the pins set horizontally on the standard section of the tower crane, since the pin connection holes of the horizontal pins are also horizontal, the contact position between them and the tower crane is located in the vertical plane. In the case where both ends of the horizontal pins are deeply corroded, the rust remover is used to remove the rust on the horizontal pins. There is a problem that the rust remover does not have time to react with the rust spots at the rusted position and directly flows out from the pin connection holes. This not only wastes the rust remover, but also makes it difficult to ensure successful rust removal, resulting in the inability to remove the pins smoothly when dismantling the tower crane. Utility Model Content

[0005] The purpose of the utility model is to provide a rust removal structure for a tower crane pin, which aims to solve the technical problems that the rust remover cannot react in time to the rust point position between the pin and the tower crane, and directly flows vertically, resulting in waste of rust remover, difficulty in ensuring successful rust removal, and inability to remove the pin smoothly.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A tower crane pin rust removal structure includes a tower crane frame and a pin, with the pins at both ends exposed from the tower crane frame, an outer sleeve shell, a limiting piece and an extrusion frame.

[0008] The outer sleeve shell includes a shell, a fluid infusion hole, a shell connecting through hole, an elastic binding belt and a binding belt fixing hole.

[0009] The shell is a cylindrical tube, the inner diameter of which is larger than the diameter of the connection position between the pin head and the tower crane frame. The inner end of the shell is sleeved on the outside of the pin head on one side and pressed tightly against the tower crane frame. Two shell connecting through holes are respectively opened at the upper and lower relative positions of the outer end of the shell, and the top side of the inner end of the shell is provided with a fluid replenishment hole with a hole distance equal to the shell diameter. Two binding strap fixing holes for connecting with elastic binding straps are respectively provided at the relative positions of the front and rear sides of the middle part of the shell. The elastic binding strap passes around the tower crane frame and the pin head on the other side, and its two ends are respectively fixed on the two binding strap fixing holes, so that the elastic binding strap is arranged in a horizontal U-shape.

[0010] The limiting piece includes a U-shaped piece body, an extrusion rod hole, a limiting nut and a limiting hole.

[0011] The U-shaped sheet body includes a vertical side sheet and horizontal card pieces on the upper and lower sides that are respectively perpendicular to the vertical side sheets. The two horizontal card pieces are respectively provided with limit sheet connection holes. The distance between the horizontal card pieces is adapted to the outer diameter of the shell. The U-shaped sheet body is clamped on the outer end surface of the shell. The setting position of the shell connection through hole corresponds to the limit sheet connection hole and is connected through a connecting piece. A limit hole is provided in the center of the vertical side sheet. One side of the limit nut is fixedly connected to the limit sheet in the corresponding limit hole. The limit nut is connected to the corresponding limit hole. Extrusion rod holes are respectively provided at the two ends of the vertical side sheet and on the upper and lower sides of the limit hole.

[0012] The extrusion frame includes an extrusion rod connecting piece, a connecting rod hole, an extrusion rod, an annular extrusion support, an annular sponge strip, a push-rotating rod, an operating handle and a pushing nut.

[0013] The extrusion rod connecting piece is parallel to the vertical side piece, and the length of the extrusion rod connecting piece is smaller than the inner diameter of the shell. Two extrusion rods are horizontally arranged and fixedly connected to the inner surface of the upper and lower ends of the extrusion rod connecting piece respectively. The extrusion rod connecting piece and the extrusion rod together form a horizontal U-shape. The length of the extrusion rod is greater than the length of the shell. The setting distance of the extrusion rod hole is adapted to the setting distance of the extrusion rod. The ends of the extrusion rod are respectively fixedly connected to the outer degree positions of the vertically arranged annular extrusion support. The width of the annular extrusion support is greater than the diameter of the extrusion rod. An annular sponge strip is fixedly connected to the inner side of the annular extrusion support. The cross-sectional size of the annular sponge strip is equal to the cross-sectional size of the annular extrusion support. The outer diameters of the annular sponge strip and the annular extrusion support are both adapted to the inner diameter of the shell. The inner diameters of the annular sponge strip and the annular extrusion support are both adapted to the diameter of the connection position between the pin head and the tower crane frame. The setting position of the fluid infusion hole is within the thickness range of the annular sponge strip.

[0014] A connecting rod hole is provided in the center of the extrusion rod connecting piece for the horizontal push-rotating rod to pass through; the outer end of the push-rotating rod is fixedly connected to a vertical operating handle; a pushing nut is provided between the operating handle and the connecting rod hole; the pushing nut is fixedly sleeved on the pushing rod and has no fixed connection with the connecting rod hole; the diameter of the connecting rod hole is larger than the diameter of the push-rotating rod; the inner diameter of the limit nut is equal to the diameter of the push-rotating rod; the outer surface of the push-rotating rod inside the pushing nut is provided with an external thread adapted to the limit nut;

[0015] The extrusion frame is inserted into the shell, and the extrusion rods are respectively inserted into the corresponding extrusion rod holes. The annular sponge strip is surrounded by the connection position between the pin head and the tower crane frame. The push-rotating rod is screwed into the limit nut and connected with its bolt, so that it can move back and forth horizontally within the range of the limit nut. The inner side of the pushing nut on the push-rotating rod presses the outer side of the extrusion rod connecting piece to drive the extrusion rod to extrude the annular sponge strip.

[0016] The contact position between the extrusion rod connecting piece and the push nut is polished to form a smooth surface.

[0017] The fixed connection is welding.

[0018] The extrusion rod connecting piece is a steel sheet, and the welding position of the pushing nut and the pushing and rotating rod is located outside the pushing nut.

[0019] The U-shaped sheet is a steel sheet, and the welding position between the limiting nut and the vertical side sheet is located on the inner side of the limiting nut.

[0020] The extruded rod is a smooth round steel rod.

[0021] The annular extrusion support is a steel sheet, and the welding position between the end of the extrusion rod and the annular extrusion support is located outside the annular extrusion support.

[0022] The annular sponge strip is bonded to the inner side of the annular extrusion tray.

[0023] The shell is a plastic shell or a metal shell, and a lubricating layer is coated on the inner wall of the shell in the range of contact with the annular extrusion support.

[0024] The connecting piece is an anchor.

[0025] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0026] The utility model designs a rust removal device connected with a tower crane and a pin. The rust removal device is designed with a needle-like pushing device composed of an outer sleeve shell, a limiting plate and an extrusion frame. The extrusion frame is pushed to extrude a liquid-absorbing cotton strip containing a rust remover, so that the rust remover can fully react with the rusted parts around the pin. The rust removal device is used to extend the reaction time between the rust remover and the rusted parts, thereby achieving the purpose of sufficient rust removal and facilitating dismantling.

[0027] The utility model is easy to manufacture, has high turnover and utilization rate, realizes the rapid disassembly of the tower crane, speeds up the construction progress, and saves construction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Figure 1 It is a structural diagram of the present utility model.

[0030] Figure 2 yes Figure 1 A partial enlarged view of .

[0031] Figure 3 yes Figure 2 Schematic diagram of the position where the push nut just touches the extrusion rod connecting piece.

[0032] Figure 4 yes Figure 2 Schematic diagram of the position of the middle squeezing rod after pushing the annular sponge strip.

[0033] Figure 5 It is a structural diagram of the outer sleeve shell.

[0034] Figure 6 yes Figure 5 Schematic diagram of the top view structure.

[0035] Figure 7 It is a structural diagram of the limiting piece.

[0036] Figure 8 yes Figure 6 Schematic diagram of the top view structure.

[0037] Figure 9 It is a structural diagram of the extrusion frame.

[0038] Figure 10 yes Figure 9 Schematic diagram of the top view structure.

[0039] Figure numerals: 1-tower crane frame, 2-pin, 3-outer sleeve shell, 31-shell, 32-fluid infusion hole, 33-shell connecting through hole, 34-elastic binding belt, 35-binding belt fixing hole, 4-limiting plate, 41-U-shaped plate, 411-vertical side plate, 412-horizontal clamping plate, 42-extrusion rod hole, 43-limiting nut, 44-limiting hole, 45-limiting plate connecting hole, 5-extrusion frame, 51-extrusion rod connecting plate, 52-connecting plate rod hole, 53-extrusion rod, 54-annular extrusion support, 55-annular sponge strip, 56-push-rotate rod, 57-operating handle, 58-push nut, 6-connecting piece. DETAILED DESCRIPTION

[0040] For example, see Figure 1-2As shown, a tower crane pin rust removal structure includes a tower crane frame 1 and a pin 2, with the pins 2 at both ends exposed from the tower crane frame 1, and also includes an outer sleeve shell 3, a limiting piece 4 and an extrusion frame 5.

[0041] See also Figure 5-6 As shown, the outer sleeve shell 3 includes a shell 31, a fluid infusion hole 32, a shell connecting through hole 33, an elastic binding band 34 and a binding band fixing hole 35.

[0042] The shell 31 is a cylindrical tube, and its inner diameter is larger than the diameter of the connection position between the pin head 22 and the tower crane frame 1. The inner end of the shell 31 is sleeved on the outside of the pin head 22 on one side and pressed tightly against the tower crane frame 1. The upper and lower sides of the outer end of the shell 31 are respectively provided with two shell connecting through holes 33 with a hole distance equal to the diameter of the outer sleeve shell 3 at a relative position of 180 degrees. The top side of the inner end of the shell 31 is provided with a fluid replenishment hole 32 with a hole distance equal to the diameter of the shell 31. The front and rear sides of the middle part of the shell 31 are respectively provided with two binding band fixing holes 35 for connecting the elastic binding band 34 at a relative position of 180 degrees. The elastic binding band 34 passes around the tower crane frame 1 and the pin head 22 on the other side, and its two ends are respectively fixed on the two binding band fixing holes 35, so that the elastic binding band 34 is U-shaped in the horizontal direction.

[0043] See also Figure 7-8 As shown, the limiting piece 4 includes a U-shaped piece body 41 , an extrusion rod hole 42 , a limiting nut 43 and a limiting hole 44 .

[0044] The U-shaped sheet 41 includes a vertical side sheet 411 and horizontal card pieces 412 on the upper and lower sides that are respectively perpendicular to the vertical side sheets 411. The two horizontal card pieces 412 are respectively provided with limit sheet connection holes 45. The distance between the horizontal card pieces 412 is adapted to the outer diameter of the shell 31. The U-shaped sheet 41 is stuck on the outer end surface of the shell 31. The setting position of the shell connection through hole 33 corresponds to the limit sheet connection hole 45 and is connected through a connector 6, which is an anchor nail.

[0045] A limiting hole 44 is opened in the center of the vertical side piece 411, and one side of the limiting nut 43 is fixedly connected to the limiting piece 4 corresponding to the limiting hole 44. The limiting nut 43 is connected to the corresponding limiting hole 44, and the two ends of the vertical side piece 411 and the upper and lower sides of the limiting hole 44 are respectively provided with extrusion rod holes 42.

[0046] See also Figure 9-10 As shown, the extrusion frame 5 includes an extrusion rod connecting piece 51, a connecting piece rod hole 52, an extrusion rod 53, an annular extrusion support 54, an annular sponge strip 55, a push-rotating rod 56, an operating handle 57 and a pushing nut 58.

[0047] The extrusion rod connecting piece 51 is parallel to the vertical side piece 411. The length of the extrusion rod connecting piece 51 is less than the inner diameter of the shell 31. Two extrusion rods 53 are horizontally arranged and fixedly connected to the inner surface of the upper and lower ends of the extrusion rod connecting piece 51. The extrusion rod connecting piece 51 and the extrusion rod 53 are together in a horizontal U shape. The length of the extrusion rod 53 is greater than the length of the shell 31. The setting distance of the extrusion rod hole 42 is adapted to the setting distance of the extrusion rod 53. The ends of the extrusion rod 53 are respectively fixedly connected to the outer side of the vertically arranged annular extrusion support 54 at 180 degrees. Position, the width of the annular extrusion support 54 is greater than the diameter of the extrusion rod 53, and an annular sponge strip 55 is fixedly connected to the inner side of the annular extrusion support 54. The cross-sectional size of the annular sponge strip 55 is equal to the cross-sectional size of the annular extrusion support 54. The outer diameters of the annular sponge strip 55 and the annular extrusion support 54 are both adapted to the inner diameter of the shell 31, and the inner diameters of the annular sponge strip 55 and the annular extrusion support 54 are both adapted to the diameter of the connection position between the pin head 22 and the tower crane frame 1. The setting position of the fluid replenishment hole 32 is located within the thickness range of the annular sponge strip 55.

[0048] A connecting rod hole 52 is provided in the center of the extrusion rod connecting piece 51 for the horizontal pushing and rotating rod 56 to pass through. The outer end of the pushing and rotating rod 56 is fixedly connected to a vertical operating handle 57. A pushing nut 58 is provided between the operating handle 57 and the connecting rod hole 52. The pushing nut 58 is fixedly sleeved on the pushing and rotating rod 56 and has no fixed connection with the connecting rod hole 52. The diameter of the connecting rod hole 52 is larger than the diameter of the pushing and rotating rod 56. The inner diameter of the limit nut 43 is equal to the diameter of the pushing and rotating rod 56. The outer surface of the pushing and rotating rod 56 within the pushing nut 58 is provided with an external thread adapted to the limit nut 43.

[0049] The extrusion frame 5 is inserted into the shell 31, and the extrusion rods 53 are respectively inserted into the corresponding extrusion rod holes 42. The annular sponge strip 55 is surrounded by the connection position between the pin head 22 and the tower crane frame 1. The push-rotating rod 56 is screwed into the limit nut 43 and connected with its bolts, so that it can move horizontally back and forth within the range of the limit nut 43. The inner side of the pushing nut 58 on the push-rotating rod 56 presses against the outer side of the extrusion rod connecting piece 51 to drive the extrusion rod 53 to squeeze the annular sponge strip 55.

[0050] In order to ensure that the contact position between the extrusion rod connecting piece 51 and the push nut 58 rotates more smoothly, this position can be polished to have a smooth surface.

[0051] The fixed connection is a circumferential welding. The extrusion rod connecting piece 51 is a steel sheet, and the welding position between the push nut 58 and the push-rotation rod 56 is located outside the push nut 58. The U-shaped piece 41 is a steel sheet, and the welding position between the limit nut 43 and the vertical side piece 411 is located inside the limit nut 43.

[0052] The extrusion rod 53 is a smooth round steel rod to ensure smooth movement of the extrusion rod 53 during the pushing process. The annular extrusion support 54 is a steel sheet, and the welding position between the end of the extrusion rod 53 and the annular extrusion support 54 is located outside the annular extrusion support 54. The annular sponge strip 55 is bonded to the inside of the annular extrusion support 54.

[0053] The housing 31 is a plastic housing 31 or a metal housing 31 , and a lubricating layer is applied to the inner wall of the housing 31 in the area in contact with the annular extrusion support 54 to ensure smooth movement during the pushing process.

[0054] The assembly and use process of this utility model is as follows:

[0055] Step 1: First, design the dimensions of the outer sleeve shell 3, the limiting piece 4 and the extrusion frame 5 according to the dimensions of the tower crane frame 1 and the pin 2; then assemble the outer sleeve shell 3, the limiting piece 4 and the extrusion frame 5.

[0056] Step 2: directly buckle the outer sleeve shell 3 of the assembled device onto the tower crane frame 1 around the pin 2, wherein the annular sponge strip 55 is correspondingly sleeved around the pin 2, and the elastic elastic band 34 is tied in place.

[0057] Step 3, see Figure 1-2 As shown, the rust remover is sucked into the annular sponge strip 55 through the liquid replenishing hole 32.

[0058] Step 4, see Figure 3 As shown, the pushing and rotating rod 56 is rotated to make the pushing nut 58 approach the extrusion rod connecting piece 51 until the pushing nut 58 is tightly against the extrusion rod connecting piece 51 . At this time, the annular sponge strip 55 has not been compressed.

[0059] Step 5, see Figure 4 As shown, the push-rotating rod 56 is continuously rotated to push the nut 58 forward close to the extrusion rod connecting piece 51 , so that the extrusion rod 53 pushes the annular sponge strip 55 to be compressed, and the rust remover in the annular sponge strip 55 is released to the periphery of the pin 2 .

[0060] Step six, remove the rust after keeping it for a period of time; during this period, the liquid can be replenished through the liquid replenishing hole 32.

[0061] Step seven, directly remove the elastic cable tie 34, loosen the assembled device, and disassemble it for turnover use.

Claims

1. A tower crane pin rust removal structure, comprising a tower crane frame (1) and a pin (2), wherein the pins (2) at both ends are exposed from the tower crane frame (1), and is characterized in that: It also includes an outer sleeve shell (3), a limiting piece (4) and an extrusion frame (5), The outer sleeve shell (3) comprises a shell (31), a fluid replenishing hole (32), a shell connecting through hole (33), an elastic binding belt (34) and a binding belt fixing hole (35). The shell (31) is a cylindrical tube, the inner diameter of which is larger than the diameter of the connection position between the pin head (22) and the tower crane frame (1). The inner end of the shell (31) is sleeved on the outside of the pin head (22) on one side and pressed against the tower crane frame (1). Two shell connecting through holes (33) with a hole distance equal to the diameter of the outer sleeve shell (3) are respectively opened at 180 degrees on the upper and lower sides of the outer end of the shell (31). A fluid replenishing hole (32) with a hole distance equal to the diameter of the shell (31) is opened on the top side of the inner end of the shell (31). Two binding belt fixing holes (35) for connecting an elastic binding belt (34) are respectively provided at 180 degrees on the front and rear sides of the middle part of the shell (31). The elastic binding belt (34) passes around the tower crane frame (1) and the pin head (22) on the other side, and its two ends are respectively fixed on the two binding belt fixing holes (35), so that the elastic binding belt (34) is arranged in a horizontal U-shape. The limiting piece (4) comprises a U-shaped piece body (41), an extrusion rod hole (42), a limiting nut (43) and a limiting hole (44). The U-shaped sheet (41) includes a vertical side sheet (411) and horizontal card sheets (412) on the upper and lower sides respectively perpendicular to the vertical side sheet (411). The two horizontal card sheets (412) are respectively provided with limit sheet connection holes (45). The distance between the horizontal card sheets (412) is adapted to the outer diameter of the shell (31). The U-shaped sheet (41) is clamped on the outer end surface of the shell (31). The setting position of the shell connection through hole (33) corresponds to the limit sheet connection hole (45) and is connected through a connecting piece (6). A limit hole (44) is provided in the center of the vertical side sheet (411). One side of a limit nut (43) is fixedly connected to the limit sheet (4) corresponding to the limit hole (44). The limit nut (43) is communicated with the corresponding limit hole (44). Extrusion rod holes (42) are respectively provided at the two ends of the vertical side sheet (411) and the upper and lower sides of the limit hole (44). The extrusion frame (5) includes an extrusion rod connecting piece (51), a connecting piece rod hole (52), an extrusion rod (53), an annular extrusion support (54), an annular sponge strip (55), a push-rotating rod (56), an operating handle (57) and a pushing nut (58). The extrusion rod connecting piece (51) is parallel to the vertical side piece (411), the length of the extrusion rod connecting piece (51) is less than the inner diameter of the shell (31), two extrusion rods (53) are arranged horizontally and fixedly connected to the inner surface of the upper and lower ends of the extrusion rod connecting piece (51), the extrusion rod connecting piece (51) and the extrusion rod (53) are together in a horizontal U-shape, the length of the extrusion rod (53) is greater than the length of the shell (31), the setting distance of the extrusion rod hole (42) is adapted to the setting distance of the extrusion rod (53), and the ends of the extrusion rod (53) are respectively fixedly connected to the outer side of the vertically arranged annular extrusion support (54) at a position 180 degrees. The width of the annular extrusion support (54) is greater than the diameter of the extrusion rod (53), and an annular sponge strip (55) is fixedly connected to the inner side of the annular extrusion support (54). The cross-sectional size of the annular sponge strip (55) is equal to the cross-sectional size of the annular extrusion support (54). The outer diameters of the annular sponge strip (55) and the annular extrusion support (54) are both adapted to the inner diameter of the shell (31). The inner diameters of the annular sponge strip (55) and the annular extrusion support (54) are both adapted to the diameter of the connection position between the pin head (22) and the tower crane frame (1). The setting position of the liquid replenishing hole (32) is located within the thickness range of the annular sponge strip (55). A connecting rod hole (52) for a horizontal push-rotating rod (56) to pass through is provided in the center of the extrusion rod connecting piece (51); a vertical operating handle (57) is fixedly connected to the outer end of the push-rotating rod (56); a pushing nut (58) is provided between the operating handle (57) and the connecting rod hole (52); the pushing nut (58) is fixedly sleeved on the push-rotating rod (56) and has no fixed connection with the connecting rod hole (52); the diameter of the connecting rod hole (52) is larger than the diameter of the push-rotating rod (56); the inner diameter of the limiting nut (43) is equal to the diameter of the push-rotating rod (56); and the outer surface of the push-rotating rod (56) within the pushing nut (58) is provided with an external thread adapted to the limiting nut (43); The extrusion frame (5) is inserted into the housing (31), and the extrusion rods (53) are respectively inserted into the corresponding extrusion rod holes (42). The annular sponge strip (55) is surrounded by the connection position between the pin head (22) and the tower crane frame (1). The push-rotating rod (56) is screwed into the limit nut (43) and connected with its bolts so that it can reciprocate horizontally within the range of the limit nut (43). The inner side of the pushing nut (58) on the push-rotating rod (56) presses against the outer side of the extrusion rod connecting piece (51) to drive the extrusion rod (53) to extrude the annular sponge strip (55).

2. The tower crane pin rust removal structure according to claim 1, characterized in that: The contact position between the extrusion rod connecting piece (51) and the push nut (58) is polished to have a smooth surface.

3. The tower crane pin rust removal structure according to claim 1, characterized in that: The fixed connection is welding.

4. The tower crane pin rust removal structure according to claim 3, characterized in that: The extrusion rod connecting piece (51) is a steel sheet, and the welding position of the pushing nut (58) and the pushing and rotating rod (56) is located outside the pushing nut (58).

5. The tower crane pin rust removal structure according to claim 3, characterized in that: The U-shaped sheet (41) is a steel sheet, and the welding position of the limiting nut (43) and the vertical side sheet (411) is located inside the limiting nut (43).

6. The tower crane pin rust removal structure according to claim 3, characterized in that: The extruded rod (53) is a smooth round steel rod.

7. The tower crane pin rust removal structure according to claim 6, characterized in that: The annular extrusion support (54) is a steel sheet, and the welding position between the end of the extrusion rod (53) and the annular extrusion support (54) is located outside the annular extrusion support (54).

8. The tower crane pin rust removal structure according to claim 7, characterized in that: The annular sponge strip (55) is bonded to the inner side of the annular extrusion support (54).

9. The tower crane pin rust removal structure according to claim 1, characterized in that: The housing (31) is a plastic housing (31) or a metal housing (31), and a lubricating layer is applied within the range where the inner wall of the housing (31) contacts the annular extrusion support (54).

10. The tower crane pin rust removal structure according to claim 1, characterized in that: The connecting piece (6) is an anchor nail.

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