A tower crane telescopic inner climbing steel beam

Abstract

The application relates to the technical field of inner climbing tower cranes, and particularly discloses a telescopic inner climbing steel beam of a tower crane, which comprises a main beam, a telescopic beam and locking pin shafts, the main body of the main beam is a first box-shaped structure, a plurality of first pin shaft holes are arranged on the plane-symmetrical two side webs, and the first pin shaft holes are arranged in a linear matrix; the telescopic beam comprises two horizontally-beam assemblies which are symmetrically arranged and have the same structure, the main body of the horizontally-beam assembly is a second box-shaped structure, a plurality of second pin shaft holes are arranged on the web at one end of the box-shaped structure, the second pin shaft holes are matched with the first pin shaft holes in terms of hole diameters, and the hole spacing is consistent with that of the first pin shaft holes, and the first box-shaped structure and the second box-shaped structure are fixedly connected through the locking pin shafts which pass through the first pin shaft holes and the second pin shaft holes. The patent aims to solve the problem of movement stagnation caused by large frictional resistance during the telescoping of the existing inner climbing steel beam. The patent is mainly used for supporting the steel beam of an inner climbing tower crane.

Description

Technical Field

[0001] This utility model relates to the technical field of internal climbing tower cranes, and in particular to a telescopic internal climbing steel beam for tower cranes. Background Technology

[0002] Telescopic internal climbing steel beams are key support components for tower cranes in the construction of super high-rise buildings. They are primarily used to fix and adjust the tower crane's position to accommodate the increasing building height. Typically, they consist of a main beam, a telescopic beam, and a locking mechanism. The overall length of the steel beam is changed by extending or retracting the telescopic beam to meet the structural space requirements of different construction stages. These steel beams must possess high strength, adjustability, and stability to ensure the safe operation of the tower crane within confined shafts. Currently, controlling the frictional resistance and improving the ease of operation of telescopic steel beams are key areas for technological optimization.

[0003] In existing technologies, solutions for telescopic internal climbing steel beams mainly fall into two categories: manual adjustment and electric drive. For example, patent CN213537066U discloses a structure that fixes the telescopic beam with a pin shaft, with cavities at both ends of the main beam to accommodate the telescopic beam, and manual locking achieved using a through rod and bolts. Patent CN220502517U discloses a telescopic and detachable tower crane internal climbing steel beam device, proposing an electric telescopic scheme driven by a gear and rack, using a remote control to control the motor to drive the telescopic beam to move, and using high-strength bolts for quick installation.

[0004] The aforementioned existing technologies have the following shortcomings: First, the manual pin structure relies on manual operation, and the direct contact between the telescopic beam and the inner wall of the main beam results in high sliding friction resistance, which can easily cause movement jamming and component wear. Frequent adjustments increase labor costs. Second, electric drive improves the level of automation and reduces friction through gear and rack meshing and slide rail contact. However, long-term use of electric drive can easily lead to a decrease in transmission accuracy and an increase in maintenance costs. Its reliability is not as good as manual adjustment.

[0005] Therefore, there is an urgent need for a new type of telescopic internal climbing steel beam. By optimizing the friction control mechanism, the frictional resistance during telescopic movement can be reduced, thus reducing component wear. At the same time, the ease of operation and structural reliability should be taken into account, so as to improve the adaptability and service life of the tower crane in complex construction environments. Utility Model Content

[0006] To address the shortcomings of existing technologies, the technical problem solved by this utility model is to provide a telescopic internal climbing steel beam for tower cranes, which solves the problem of motion jamming caused by high frictional resistance during the telescopic process of existing internal climbing steel beams.

[0007] To solve the above problems, the technical solution adopted by this utility model is: a telescopic internal climbing steel beam for a tower crane, including a main beam, a telescopic beam, and a locking pin.

[0008] The main body of the main beam is a first box-shaped structure. The web plates on both sides of the first box-shaped structure are provided with a plurality of first pin holes, which are arranged in a linear matrix.

[0009] The first box-shaped structure has rolling components symmetrically distributed along the plane on its bottom and sides. The rolling components are used to reduce the frictional resistance of the steel beam during the expansion and contraction process, and to support the main beam and limit the horizontal displacement of the expansion and contraction beam.

[0010] The telescopic beam includes two identical and symmetrically arranged crossbeam assemblies. The main body of each crossbeam assembly is a second box-shaped structure. The web of one end of the second box-shaped structure is provided with multiple second pin holes. The diameter of the second pin holes matches the diameter of the first pin holes, and the hole spacing is consistent with that of the first pin holes. The cross-sectional dimension of the second box-shaped structure is smaller than that of the first box-shaped structure, so that the second box-shaped structure can be inserted into the first box-shaped structure and slide on the rolling assembly. The first box-shaped structure and the second box-shaped structure are fixedly connected by locking pins passing through the first pin holes and the second pin holes.

[0011] Compared with existing technologies, the beneficial effects of this solution are: the rolling component is used to support the main beam and reduce the frictional resistance between the telescopic beam and the main beam during telescopic movement, and can also limit the horizontal displacement of the telescopic beam and reduce frictional resistance. This solution converts traditional sliding friction into rolling friction, reduces the resistance during telescopic movement, makes the telescopic beam slide more smoothly in the box-type main beam, and solves the problem of motion jamming.

[0012] Furthermore, the first box-shaped structure has a rectangular cross-section and is welded from steel plates with a wall thickness of 20mm.

[0013] Furthermore, the diameter of the first pin hole is 20mm, and the hole spacing is 200mm.

[0014] Furthermore, the rolling assembly includes a bottom roller and a side roller; the roller is embedded in a rectangular opening on the first box-shaped structure and can rotate freely in a fixed position without constraint, with the rotation direction of the roller parallel to the extension and retraction direction of the telescopic beam.

[0015] Furthermore, the roller is made of wear-resistant aluminum alloy steel with a chrome-plated surface and a diameter of 50mm. This enhances wear resistance, extends the roller's service life, and reduces frequent replacement and maintenance costs caused by wear.

[0016] Furthermore, the roller includes a bearing and a fixed post, the fixed post passing through the bearing and being fixedly connected to the outer surface of the first housing structure.

[0017] Furthermore, the distance by which the roller protrudes from the inner wall of the first box-shaped structure is 5mm.

[0018] Furthermore, the rolling assembly includes a raceway and a ball. The raceway has a U-shaped groove in cross-section, with the raceway opening smaller than the ball diameter and the raceway depth smaller than the ball diameter, causing the ball portion to protrude from the inner wall of the first box-shaped structure. The ball can rotate freely within the raceway.

[0019] Furthermore, the raceway includes a longitudinal raceway and a transverse raceway. The longitudinal raceway is symmetrically distributed along the bottom and sides of the first box-shaped structure. The transverse raceway is located on the bottom surface of the first box-shaped structure, is distributed at equal intervals parallel to the cross-section of the bottom surface of the first box-shaped structure, and is connected to the longitudinal raceway on the bottom surface. Ball bearings are embedded in the longitudinal raceway and the transverse raceway on the side surface.

[0020] Furthermore, the balls are made of wear-resistant steel and have a uniform diameter. Attached Figure Description

[0021] Figure 1 This is a side view of the internal climbing steel beam in Example 1.

[0022] Figure 2 for Figure 1 AA cross-section view.

[0023] Figure 3 This is a schematic diagram of the structure of the novel roller in Example 1.

[0024] Figure 4 Schematic diagram of the side of the internal climbing steel beam in Example 2.

[0025] Figure 5 for Figure 4 BB cross-section.

[0026] Figure 6 This is a partial structural schematic diagram of the internal climbing steel beam in Example 2.

[0027] The reference numerals in the accompanying drawings include: 1 main beam, 2 telescopic beam, 21 crossbeam assembly, 3 locking pin, 4 roller, 41 bottom roller, 42 side roller, 401 fixed column, 402 bearing, 5 rectangular opening, 6 ball bearing, 7 raceway, 71 longitudinal raceway, 72 transverse raceway, 8 stop post, and 9 stop block. Detailed Implementation

[0028] The following detailed description illustrates the specific implementation method:

[0029] Example 1

[0030] As attached Figure 1-3 As shown: A telescopic internal climbing steel beam for a tower crane includes a main beam 1, a telescopic beam 2, and a locking pin 3;

[0031] The main body of the main beam 1 is a first box-shaped structure with a rectangular cross-section, welded from steel plates with a wall thickness of 20mm and a length that can be designed to be 3-5m according to actual needs. The first box-shaped structure has multiple first pin holes on the two web plates symmetrically arranged along the central axis. The diameter of the first pin holes is 20mm, the spacing between the holes is 200mm, and they are arranged in a linear matrix.

[0032] The first box-shaped structure is provided with bottom rollers 41 and side rollers 42 symmetrically distributed along the plane on the bottom and side surfaces. The rollers 4 are made of wear-resistant aluminum alloy steel with chrome plating on the surface and have a diameter of 50mm.

[0033] The roller 4 includes a bearing 402 and a fixing post 401. The fixing post 401 passes through the bearing 402 and is welded and fixedly connected to the outer surface of the first box-shaped structure.

[0034] The roller 4 is embedded in the rectangular opening 5 on the first box-shaped structure and can rotate freely in a fixed position without constraint. The direction of rotation of the roller is parallel to the direction of extension and retraction of the telescopic beam.

[0035] The bottom roller 41 is used to support the main beam 1 and reduce the frictional resistance between the telescopic beam 2 and the main beam 1 during telescopic movement. The side roller 42 is used to limit the horizontal displacement of the telescopic beam 2 and reduce frictional resistance.

[0036] The telescopic beam 2 includes two identical and symmetrically arranged crossbeam assemblies 21. The main body of the crossbeam assembly 21 is a second box-shaped structure. The web of one end of the second box-shaped structure is provided with a plurality of second pin holes. The diameter of the second pin holes matches the diameter of the first pin holes, and the hole spacing is consistent with that of the first pin holes.

[0037] The cross-sectional dimensions of the second box-shaped structure are smaller than those of the first box-shaped structure, allowing the second box-shaped structure to be inserted into the first box-shaped structure and slide on the roller 4. The distance by which the roller 4 protrudes from the inner wall of the first box-shaped structure is 5mm. The telescopic stroke of the telescopic beam 2 can be achieved by adjusting the alignment of the second pin hole with the first pin hole, with a maximum telescopic length of 4m. When the telescopic beam 2 is adjusted to the target position, the first box-shaped structure and the second box-shaped structure are fixedly connected by the locking pin 3 passing through the first pin hole and the second pin hole.

[0038] Implementation method:

[0039] Step 1: First, fix one side of the crossbeam assembly 21 inside the building.

[0040] Step 2: Push the main beam 1 to move on the fixed crossbeam assembly 21, and use the rollers 4 for positioning assistance;

[0041] Step 3: Align the first pin hole of the crossbeam assembly 21 with the second pin hole of the main beam 1, and install the locking pin 3.

[0042] Step 4: Insert the other side of the crossbeam assembly 21 into the main beam 1, and use the rollers 4 for positioning.

[0043] Step 5: Align the first pin hole of the other side crossbeam assembly 21 with the second pin hole of the main beam 1, and install the locking pin 3.

[0044] Step 6: Secure the other side of the crossbeam assembly 21 inside the building.

[0045] Example 2

[0046] As attached Figure 4-6 As shown, the difference between Embodiment 2 and Embodiment 1 is that the bottom and sides of the first box-shaped structure are not provided with rectangular openings and rollers, but instead with raceways; the cross-section of the raceway is U-shaped groove, the raceway opening is smaller than the diameter of the ball, and the raceway depth is smaller than the diameter of the ball, so that the ball protrudes from the inner wall of the first box-shaped structure.

[0047] The raceway includes a longitudinal raceway and a transverse raceway. The longitudinal raceway is symmetrically distributed along the bottom and sides of the first box-shaped structure. The transverse raceway is located on the bottom surface of the first box-shaped structure, is distributed at equal intervals parallel to the cross-section of the bottom surface of the first box-shaped structure, and is connected to the longitudinal raceway on the bottom surface. Ball bearings are embedded in the longitudinal and transverse raceways on the sides. The ball bearings are made of wear-resistant steel, have the same diameter, and can rotate freely within the raceway.

[0048] The balls enter the transverse raceway through the longitudinal raceway on the bottom surface. After all the balls have entered the transverse raceway, a stopper is inserted into the longitudinal raceway on the bottom surface to prevent the balls from falling out.

[0049] After all the balls have entered the side longitudinal raceway, detachable stops are installed at both ends of the side longitudinal raceway to prevent the balls from falling out.

[0050] In Example 2, instead of openings and rollers on the bottom and sides of the main beam, U-shaped raceways are used, with balls embedded in the raceways to form a rolling friction interface and reduce sliding friction. The balls protrude from the raceways and contact the surface of the telescopic beam to achieve point contact rolling, further reducing the coefficient of friction, effectively eliminating motion jamming, and making the telescopic process smoother.

[0051] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A telescopic internal climbing steel beam for a tower crane, comprising a main beam, a telescopic beam, and locking pins, wherein the main beam is a first box-shaped structure, and the webs on both sides of the first box-shaped structure are provided with a plurality of first pin holes, the first pin holes being arranged in a linear matrix. Its features are: The first box-shaped structure has rolling components symmetrically distributed along the plane on its bottom and sides. The rolling components are used to reduce the frictional resistance of the steel beam during the expansion and contraction process, and to support the main beam and limit the horizontal displacement of the expansion and contraction beam. The telescopic beam includes two identical and symmetrically arranged crossbeam assemblies. The main body of each crossbeam assembly is a second box-shaped structure. The web of one end of the second box-shaped structure is provided with multiple second pin holes. The diameter of the second pin holes matches the diameter of the first pin holes, and the hole spacing is consistent with that of the first pin holes. The cross-sectional dimension of the second box-shaped structure is smaller than that of the first box-shaped structure, so that the second box-shaped structure can be inserted into the first box-shaped structure and slide on the rollers. The first box-shaped structure and the second box-shaped structure are fixedly connected by locking pins passing through the first pin holes and the second pin holes.

2. The telescopic internal climbing steel beam for a tower crane according to claim 1, characterized in that: The first box-shaped structure has a rectangular cross-section and is welded from steel plates with a wall thickness of 20mm.

3. The telescopic internal climbing steel beam for a tower crane according to claim 1, characterized in that: The diameter of the first pin hole is 20mm, and the hole spacing is 200mm.

4. The telescopic internal climbing steel beam for a tower crane according to claim 1, characterized in that: The rolling assembly includes a bottom roller and a side roller; the roller is embedded in a rectangular opening on the first box-shaped structure and can rotate freely in a fixed position without constraint, with the direction of roller rotation parallel to the extension and retraction direction of the telescopic beam.

5. A telescopic internal climbing steel beam for a tower crane according to claim 4, characterized in that: The roller is made of wear-resistant aluminum alloy steel with chrome plating and a diameter of 50mm.

6. A telescopic internal climbing steel beam for a tower crane according to claim 4, characterized in that: The roller includes a bearing and a fixed post, the fixed post passing through the bearing and being fixedly connected to the outer surface of the first housing structure.

7. A telescopic internal climbing steel beam for a tower crane according to any one of claims 4-6, characterized in that: The distance by which the roller protrudes from the inner wall of the first box-shaped structure is 5mm.

8. A telescopic internal climbing steel beam for a tower crane according to claim 1, characterized in that: The rolling assembly includes a raceway and balls. The raceway has a U-shaped groove in its cross-section. The raceway opening is smaller than the diameter of the balls, and the raceway depth is smaller than the diameter of the balls, so that the balls protrude from the inner wall of the first box-shaped structure. The balls can rotate freely within the raceway.

9. A telescopic internal climbing steel beam for a tower crane according to claim 8, characterized in that: The raceway includes a longitudinal raceway and a transverse raceway. The longitudinal raceway is symmetrically distributed along the bottom and sides of the first box-shaped structure. The transverse raceway is located on the bottom surface of the first box-shaped structure, is distributed at equal intervals parallel to the cross-section of the bottom surface of the first box-shaped structure, and is connected to the longitudinal raceway on the bottom surface. Ball bearings are embedded in the longitudinal raceway and the transverse raceway on the side surface.

10. A telescopic internal climbing steel beam for a tower crane according to any one of claims 8-9, characterized in that: The balls are made of wear-resistant steel and have a uniform diameter.

Images