A new type of guiding device for the inner frame of tower crane

Abstract

The present invention discloses a novel guide device for the inner sleeve of a tower crane, which is clamped between the inner sleeve and a sheet-shaped standard section, and comprises an inner sleeve angle steel, a mounting plate, a guide block and a mounting assembly, wherein the mounting plate is vertically fixed on two outer sides of the inner sleeve angle steel, and the guide block is sleeved on the mounting plate and detachably fixed through the mounting assembly, so that the mounting plate is located in the guide block. The present invention improves the guide device of the inner sleeve, changes the welding form of the limiter into an assembled form, converts hard friction into soft friction, eliminates the sharp point stress during the jacking process, makes the sleeve more stable during the jacking process, and makes the construction of the operator safer.

Description

Technical Field

[0001] The invention relates to the technical field of tower cranes, and in particular belongs to a novel guiding device for an inner sleeve of a tower crane. Background Art

[0002] At present, the guide devices of the existing tower crane inner frame are all rigid guides, which are welded on the outer side of the four-sided angle steel of the inner frame. The limit guide plate is the main force-bearing part during the jacking process of the inner-frame tower crane. Its strength, rigidity and wear resistance directly affect the jacking safety and reliability of this type of tower crane. If the rigidity of the guide device is higher than that of the standard section of the tower body, the angle steel around the standard section will wear faster, and the maintenance and use cost will be higher.

[0003] The existing installation method of the inner frame is as follows: (1) A lifting cylinder is installed at the upper lifting beam of the inner frame, and the lower end of the lifting cylinder is connected to the lower lifting beam. The lower lifting beam is a movable beam. When the tower is at the height, the lower lifting beam is installed on the step block of the basic section frame. During the upward lifting process, step on the standard section step block. Through the extension and retraction of the lifting cylinder, the lower beam is continuously driven to climb up, and at the same time, the inner frame is continuously lifted up; (2) Limiting guide plates are welded on the outer sides of the four-sided angle steel of the inner frame. During the lifting process, these 8 limiting plates play a role in guiding and bearing lateral forces.

[0004] The new guide device of the inner sleeve is a rigid matching structure. The welded rigid guide structure is simple and has fewer components. However, due to the gap between the guide and the standard section guide rail during the upward lifting process of the inner sleeve, when the upper load of the inner sleeve is on the geometric core, the sleeve will deflect laterally. At this time, the contact part is point contact, and the contact stress is large. The strength of the standard section and the sleeve needs to be increased to a certain level before use. This method may bring a large self-weight cost.

[0005] When the rigid matching structure is welded on the inner sleeve frame, the required parallelism is high, and the flatness of the limit plate is also high. In order to ensure the above requirements, it is usually necessary to make positioning tooling, and flatness detection is required after welding to avoid the phenomenon that the sleeve cannot be inserted due to welding deformation of the components; after the limit plate and the standard section have experienced several disassembly and assembly of the tower, the protective paint on the matching surface is damaged, which is very easy to cause rust in the outdoor environment. When local dents appear, it may not pass the regular safety inspection, and the standard parts or inner sleeve frame need to be replaced, and the service life of the components is short. Summary of the invention

[0006] The purpose of the present invention is to design the safety, manufacturing difficulty, use cost and matching method of the new guide device of the inner sleeve frame, adopt the design concept of assembled weak guide, let the parts with low hardness wear first to protect the main components, and solve the problems raised in the above technical background.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A novel guide device for an inner sleeve of a tower crane is clamped between the inner sleeve and a sheet-like standard section, and comprises an inner sleeve angle steel, a mounting plate, a guide block and a mounting assembly. The mounting plate is vertically fixed on the two outer sides of the inner sleeve angle steel, and the guide block is sleeved on the mounting plate and detachably fixed by the mounting assembly so that the mounting plate is located inside the guide block.

[0009] Furthermore, the inner frame angle steel is a right-angle steel sheet, and the mounting plate is mounted on two outer sides of the inner frame angle steel at a position close to the right angle line and parallel to the right angle line.

[0010] Furthermore, the guide block is in the shape of a groove with openings at both ends, the width of the groove is slightly larger than the thickness of the mounting plate, and the depth of the groove is consistent with the width of the mounting plate, so that the mounting plate can be completely placed in the groove.

[0011] Furthermore, the groove in the guide block is a square groove, and the bottom surface of the groove is a plane.

[0012] Furthermore, the mounting assembly includes a load-bearing shaft, a retaining ring and a cotter pin. The mounting plate and the guide block are both provided with through holes, the load-bearing shaft penetrates the through holes, and the retaining ring and the cotter pin are sequentially arranged at the end of the load-bearing shaft to fix the entire guide block so that the entire guide block is sleeved on the outside of the guide block.

[0013] Furthermore, the through hole on the mounting plate is arranged in the middle, and the through hole on the guide block overlaps with the position of the through hole on the mounting plate.

[0014] Furthermore, the standard section angle steel of the guide device is fixed on the inner sleeve frame, the sheet-shaped standard section is provided with an outer sleeve standard section angle steel, and the end surface of the guide block is just in contact with the outer sleeve standard section angle steel.

[0015] Furthermore, the installation method of the guide device is as follows: first weld the mounting plate to the outside of the inner sleeve frame angle steel, insert the guide block into the mounting plate, and insert the load-bearing shaft, retaining ring, and cotter pin in sequence, and then weld and fix the entire guide device to the inner sleeve frame to complete the installation of the single-sided guide device. Repeat the above steps 8 times to complete the installation of the entire guide system.

[0016] In summary, since the present invention adopts the above technical solution, the present invention has the following technical effects:

[0017] 1. The present invention transforms the point contact between the guide piece of the traditional guide device and the guide rail of the standard section into surface contact, which greatly reduces the wear on the inner side of the main steel of the standard section and increases the service life of the standard section;

[0018] 2. The guide device of the present invention changes the force mode during rollover, disperses the concentrated force, and improves the stress distribution at the contact point of the component;

[0019] 3. The present invention changes the traditional fixing method of the guide block, making it a replaceable component, thereby extending the service life of the inner sleeve frame and reducing the maintenance cost of the customer.

[0020] 4. The guide device of the present invention adopts the design concept of assembled weak guide, so that the parts with low hardness are worn first to protect the main components.

[0021] 5. The guide device of the present invention is designed to be assembled and adjustable, which reduces the difficulty of welding and improves work efficiency.

[0022] 6. The force-bearing mode of the transformation component of the present invention transforms the local sharp point stress into surface force, so that the force is decomposed into X and Y direction components. The surface force of the standard angle steel is smaller and it is not easy to form dents.

[0023] 7. The present invention improves the guiding device of the inner sleeve frame, changes the welding form of the limiter into an assembled form, converts hard friction into soft friction, and eliminates the sharp point stress during the lifting process. The sleeve frame is more stable during the lifting process, the construction of the operators is safer, and the service life of the two large parts, the inner sleeve frame and the standard section, is increased, and the convenience of after-sales maintenance services is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the guide device of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the guide device of the present invention when it is installed on the inner sleeve frame;

[0026] Figure 3 It is a force diagram of the guide device of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure when the conventional guide device is installed on the inner sleeve frame;

[0028] Figure 5 It is a force diagram of a conventional guide device;

[0029] In the attached drawings, there are inner sleeve frame 1, sheet standard section 2, inner sleeve frame angle steel 3, mounting plate 4, guide block 5, load-bearing shaft 6, retaining ring 7, and cotter pin 8. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are only for the purpose of enabling the reader to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0031] Example 1

[0032] like Figure 1 and Figure 2 As shown, a new guide device for the inner sleeve of a tower crane is clamped between the inner sleeve 1 and the sheet standard section 2, and includes an inner sleeve angle steel 3, a mounting plate 4, a guide block 5 and a mounting assembly. The mounting plate 4 is vertically fixed on the two outer sides of the inner sleeve angle steel 3. The guide block is sleeved on the mounting plate 4 and detachably fixed through the mounting assembly, so that the mounting plate 4 is located in the guide block 5. By improving the guide device of the inner sleeve, the welding form of the limiter is changed to an assembled form, hard friction is converted into soft friction, and the sharp point stress during the jacking process is eliminated. The sleeve is more stable during the jacking process, and the construction of the operator is safer.

[0033] The inner sleeve frame angle steel 3 is a right angle steel sheet, and the mounting plate 4 is mounted on the two outer sides of the inner sleeve frame angle steel 3 near the right angle line and parallel to the right angle line. The mounting plate 4 is vertically downward so that the guide block after installation is also vertically downward, which is consistent with the sliding direction of the inner sleeve frame and has less resistance.

[0034] The guide block 5 is in the shape of a groove with openings at both ends. The width of the groove is slightly larger than the thickness of the mounting plate, and the depth of the groove is consistent with the width of the mounting plate, so that the mounting plate can be completely placed in the groove; the groove in the guide block 5 is a square groove, and the bottom surface of the groove is a plane, which increases the friction area and reduces loss.

[0035] The mounting assembly includes a bearing shaft 6, a retaining ring 7 and a split pin 8. The mounting plate 4 and the guide block 5 are both provided with through holes, the bearing shaft 6 penetrates through the through holes, and the retaining ring 7 and the split pin 8 are sequentially arranged at the end of the bearing shaft to fix the entire guide block so that the entire guide block is sleeved on the outside of the guide block. The use of the mounting assembly for installation and fixing facilitates the disassembly and replacement of the guide block.

[0036] The through hole on the mounting plate 4 is arranged in the middle, and the through hole on the guide block 5 overlaps with the position of the through hole on the mounting plate 4 .

[0037] The standard section angle steel of the guide device is fixed on the inner sleeve frame, the sheet-shaped standard section is provided with an outer sleeve standard section angle steel, and the end surface of the guide block just contacts with the outer sleeve standard section angle steel.

[0038] The present invention is mainly designed for the safety, manufacturing difficulty, use cost and matching method of the new guide device of the inner sleeve frame. (1) The design concept of assembled weak guide is adopted to allow the parts with low hardness to wear first to protect the main components; (2) It is designed as an assembled and adjustable installation method to reduce the difficulty of welding and improve work efficiency; (3) The force mode of the component is changed, and the local sharp point stress is converted into surface force, so that the force is decomposed into X and Y direction components. The surface force of the standard section angle steel is smaller and it is not easy to form dents; (4) The service life of the two large parts of the inner sleeve frame and the standard section is improved, and the convenience of after-sales maintenance service is improved.

[0039] Force analysis of the improved inner sleeve guide block:

[0040] This implementation scheme is an assembled guide device, and its weak guide components include connectors, locking parts, adjustment parts, etc. During the lifting process of the inner sleeve frame, when the deflection occurs, the contact between the guide and the standard section is surface contact, which is surface pressure in four directions at the same time, the local stress is reduced, the friction force in the lifting direction is reduced, and the probability of surface wear of the standard section is reduced. At the same time, the weak guide is a detachable part, which avoids the loss of large parts replacement due to wear and tear. Reduce the customer's use and maintenance costs.

[0041] Example 2

[0042] The installation method of a new guide device for the inner sleeve of a tower crane is as follows: first weld the mounting plate to the outside of the inner sleeve angle steel, insert the guide block into the mounting plate 4, and insert the load-bearing shaft 6, retaining ring 7, and cotter pin 8 in sequence, and then weld and fix the entire guide device to the inner sleeve 1 to complete the installation of the single-side guide device. Repeat the above steps 8 times to complete the installation of the entire guide system. The matching clearance between the guide block and the standard section angle steel is 1mm.

[0043] The specific implementation plan is as follows:

[0044] By replacing the welded limit plate with a combination of a fixed bracket and a sleeve-type wear-resistant slider, the actual needs of wear, stress concentration and failure to meet safe use after a period of use are solved.

[0045] (I) Implementation plan of the guide device

[0046] (1) The guide block is made of high-hardness wear-resistant material, cast iron or polymer nylon wear-resistant material;

[0047] (2) The connecting pin is made of 40Cr bar material, then quenched and tempered, and the surface is galvanized;

[0048] (3) The two sides of the fixing frame for installing the guide block are milled to ensure that there is no jamming during installation.

[0049] This embodiment improves the guide device of the inner sleeve frame, changes the welding form of the limiter into an assembled form, converts hard friction into soft friction, and eliminates the sharp point stress during the jacking process. The sleeve frame is more stable during the jacking process, the construction of the operators is safer, and the service life of the two large parts, the inner sleeve frame and the standard section, is increased, and the convenience of after-sales maintenance services is improved.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A guide device for an inner sleeve of a tower crane, the guide device being clamped between the inner sleeve and a sheet-like standard section, characterized in that: It includes an inner sleeve frame angle steel, a mounting plate, a guide block and a mounting assembly, wherein the mounting plate is vertically fixed on two outer sides of the inner sleeve frame angle steel, and the guide block is sleeved on the mounting plate and detachably fixed through the mounting assembly so that the mounting plate is located inside the guide block; The inner sleeve frame angle steel is a right-angle steel sheet, and the mounting plate is mounted on two outer sides of the inner sleeve frame angle steel at a position close to the right angle line and parallel to the right angle line; The guide block is in the shape of a groove with openings at both ends, the width of the groove is slightly larger than the thickness of the mounting plate, and the depth of the groove is consistent with the width of the mounting plate, so that the mounting plate can be completely placed in the groove; The groove in the guide block is a square groove, and the bottom surface of the groove is a plane; The inner sleeve frame angle steel of the guide device is fixed on the inner sleeve frame, the sheet-shaped standard section is provided with an outer sleeve standard section angle steel, and the end surface of the guide block is just in contact with the outer sleeve standard section angle steel.

2. The guiding device of the inner frame of a tower crane according to claim 1, characterized in that: The mounting assembly includes a load-bearing shaft, a retaining ring and a cotter pin. The mounting plate and the guide block are both provided with through holes, the load-bearing shaft penetrates the through holes, the retaining ring and the cotter pin are fixedly arranged at the end of the load-bearing shaft in sequence, so that the entire guide block is sleeved on the outside of the mounting plate.

3. The guiding device of the inner frame of a tower crane according to claim 2, characterized in that: The through hole on the mounting plate is arranged in the middle, and the through hole on the guide block overlaps with the position of the through hole on the mounting plate.

4. The guiding device of the inner frame of a tower crane according to claim 1, characterized in that: The installation method of the guide device is as follows: first weld the mounting plate to the outside of the inner sleeve frame angle steel, put the guide block on the mounting plate, and insert the load-bearing shaft, retaining ring, and cotter pin in sequence, and then weld and fix the entire guide device to the inner sleeve frame to complete the installation of the single-sided guide device. Repeat the above steps 8 times to complete the installation of the entire guide system.

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