A process for controlling the dimensions of a slewing structure of a roller-type crane

Abstract

The application relates to a roller type crane rotary structure size control process, characterized in that: the specific control process is as follows: S1: rotary chassis and lower support manufacturing tolerance requirement; S2: center cross beam assembly; S3: auxiliary strip beam, front and rear rotary support beam assembly; S4: rotary chassis main structure assembly; S5: front and rear bearing rail beam, center shaft connecting plate assembly; S6: machining preparation; S7: machining; in each step, the precision needs to be controlled within a reasonable range, and when finally installing the crane rotary structure, the size precision control of the rotary structure is realized; compared with the final detection installation mode, the installation step of gradually detecting and controlling the precision reduces the assembly efficiency, guarantees the precision requirement, and reduces the probability of rework and finishing.

Description

Technical Field

[0001] This invention relates to the field of dimensional control technology for the slewing structure of roller cranes, and more particularly to a dimensional control process for the slewing structure of roller cranes. Background Technology

[0002] The slewing chassis includes the anti-roller structure, the main structure of the slewing chassis, the counterweight box, the slewing mechanism, the truss frame, and the cast-in-place counterweight; the total weight of the slewing chassis assembly is approximately 1950T. The installation sequence and the arrangement of the jigs involve the overall dimensional installation accuracy. Therefore, in order to ensure the installation accuracy of the slewing structure of this roller crane, it is necessary to gradually control the installation gears at each position to achieve overall dimensional accuracy control of the slewing structure. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a process for controlling the dimensions of the slewing structure of a roller crane, which can solve the problem of large dimensional errors in the slewing structure of a typical roller crane after installation.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is: a process for controlling the dimensional changes of a roller crane's slewing structure, the innovation of which lies in the following specific control process:

[0005] S1: Manufacturing tolerance requirements for slewing chassis and lower support: The distance H from the upper surface of the slewing chassis support frame to the slewing chassis reference surface must meet a negative tolerance of 0 to -3; the flatness of the slewing chassis positive roller track beam after welding must be less than 10mm; the distance H between the machined surface of the slewing chassis track beam and the machined surface of the center seat must meet a tolerance of ±1.5.

[0006] S2: Center Crossbeam Assembly: Mark the center cross line of the center crossbeam on the ground and extend it outwards. Use this as a reference to mark the center lines of each component, and then arrange the cylindrical jig in place in sequence. Place each component of the center crossbeam on the cylindrical jig, and adjust the levelness and verticality of the components with the bottom plane of the center crossbeam as a reference. The levelness should be ≤3mm and the verticality ≤2mm. Use the center line of the center crossbeam as a reference to mark the allowance trimming lines at the connection between components, and trim them off. After ensuring that the opening size between components meets the requirements, spot weld the clamps at the connection of the components and correct the interface between the components to ensure that the interface is intact. After drawing the processing lines of the roller track surface, position and install the center seat.

[0007] S3: Assembly of auxiliary beams and front and rear slewing support beams: Using the center line of the central crossbeam as a reference, mark the installation position lines of the spoke beams and front and rear slewing support beams; place each component base plate upwards on the cylindrical jig, and adjust the horizontal and vertical of each component using the center crossbeam as a reference, requiring horizontality ≤3mm and verticality ≤2mm; mark the excess trimming lines at the connection between each component and trim them off, trim the welding bevel at the butt joint; re-measure the horizontality and verticality of each component, and after correcting and adjusting the dimensions and positions of each component using the center crossbeam as a reference, spot weld the positioning clips at the component connection, and do not weld the butt joint yet; the distance H from the upper surface of the slewing chassis mechanism support frame to the slewing chassis reference surface meets the negative tolerance of 0 to -3.

[0008] S4: Assembly of the main structure of the slewing chassis: Using the center line of the crossbeam as a reference, mark the installation position lines of each component of the main structure of the slewing chassis; place each component with its base plate facing upward on the cylindrical jig, and adjust the level and verticality of each component with the center crossbeam as a reference, requiring a levelness of ≤3mm and a verticality of ≤2mm; mark the excess trimming lines at the connection between each component and trim them off, trim the welding bevel at the butt joint; re-measure the levelness and verticality of each component, and after correcting and adjusting the size and position of each component with the center crossbeam as a reference, spot weld the positioning clips at the component connection, and weld the butt joints respectively; the flatness of the slewing chassis positive roller track beam after welding is less than 10mm;

[0009] S5: Assembly of front and rear rail bearing beams and central shaft connecting plates: Place the bottom plates of each component of the rail bearing beams upward on the main structure of the slewing chassis. Mark and trim the allowance with the central cross line of the central cross beam as the reference, ensuring that each partition of the rail bearing beam corresponds one-to-one with the internal stiffening plate of the slewing chassis; open the welding bevel at the joint; re-measure the horizontality and verticality of the front and rear rail bearing beams, requiring flatness ≤3mm and verticality ≤1.5mm; after correcting and adjusting the position of each component with the central cross line of the central cross beam as the reference, weld according to the blueprint requirements; after welding, mark the allowance machining line of the rail bearing surface for the first time, and use the allowance machining line as the reference to position and weld the center seat, ensuring that the flatness of the machined surface of the rail bearing beam and the machined surface of the center seat is controlled within ±1.5.

[0010] S6: Machining preparation: Before machining the rail bearing surface, the slewing chassis needs to be lifted 5-10cm off the tire to release stress; using the machining plane of the connecting plate of the slewing chassis center shaft as the reference, adjust the slewing chassis to be horizontal and draw the cross center line of the slewing chassis, and re-measure the machining line of the rail bearing surface; according to the roller rail marking in the process sheet and the requirements in the installation process, draw the rail inspection circle line;

[0011] S7: Machining: After verifying the level of the machining fixture, machine the thickness allowance of the front and rear bearing rail beams as required. During machining, multiple measurements are required, and the flatness must be measured after each cut. If any unexpected situation is found during machining, the number of measurements must be increased to ensure that the final measurement result meets the drawing requirements. The flatness must not exceed 1mm / 1m of the circumference. The rail installation area must meet the requirement of 0.2mm / 300mm along the width of the rail. The maximum height difference of the entire circle must not exceed 3mm, and there must be no tool marks in the rail installation area. The remaining machined surfaces shall be machined according to the blueprint requirements. Using the center of the slewing chassis as the reference, draw the installation position line of the positive roller with a diameter tolerance of ±3mm and a radius tolerance of ±2mm. Using the upper surface of the machined bearing rail beam as the reference, make a punch mark on the side of the slewing chassis with a size of 2000mm, which will serve as the height reference for the subsequent truss frame installation.

[0012] The advantages of this invention are:

[0013] 1) In each step of this invention, the accuracy needs to be controlled within a reasonable range. When finally installing the crane slewing structure, the dimensional accuracy of the slewing structure is controlled. This step-by-step installation process of checking and controlling accuracy reduces assembly efficiency compared to the final inspection and installation method, but it ensures the accuracy requirements and thus reduces the probability of rework. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a forming state diagram of the slewing structure dimension control process of a roller crane according to the present invention.

[0016] Figures 2 to 6 This is a diagram illustrating the key technology of forming a slewing structure control process for a roller crane according to the present invention. Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0019] like Figures 1 to 6 The illustrated process for controlling the slewing structure dimensions of a roller crane is as follows:

[0020] S1: Manufacturing tolerance requirements for slewing chassis and lower support: The distance H from the upper surface of the slewing chassis support frame to the slewing chassis reference surface must meet a negative tolerance of 0 to -3; the flatness of the slewing chassis positive roller track beam after welding must be less than 10mm; the distance H between the machined surface of the slewing chassis track beam and the machined surface of the center seat must meet a tolerance of ±1.5.

[0021] S2: Center Crossbeam Assembly: Mark the center cross line of the center crossbeam on the ground and extend it outwards. Use this as a reference to mark the center lines of each component, and then arrange the cylindrical jig in place in sequence. Place each component of the center crossbeam on the cylindrical jig, and adjust the levelness and verticality of the components with the bottom plane of the center crossbeam as a reference. The levelness should be ≤3mm and the verticality ≤2mm. Use the center line of the center crossbeam as a reference to mark the allowance trimming lines at the connection between components, and trim them off. After ensuring that the opening size between components meets the requirements, spot weld the clamps at the connection of the components and correct the interface between the components to ensure that the interface is intact. After drawing the processing lines of the roller track surface, position and install the center seat.

[0022] S3: Assembly of auxiliary beams and front and rear slewing support beams: Using the center line of the central crossbeam as a reference, mark the installation position lines of the spoke beams and front and rear slewing support beams; place each component base plate upwards on the cylindrical jig, and adjust the horizontal and vertical of each component using the center crossbeam as a reference, requiring horizontality ≤3mm and verticality ≤2mm; mark the excess trimming lines at the connection between each component and trim them off, trim the welding bevel at the butt joint; re-measure the horizontality and verticality of each component, and after correcting and adjusting the dimensions and positions of each component using the center crossbeam as a reference, spot weld the positioning clips at the component connection, and do not weld the butt joint yet; the distance H from the upper surface of the slewing chassis mechanism support frame to the slewing chassis reference surface meets the negative tolerance of 0 to -3.

[0023] S4: Assembly of the main structure of the slewing chassis: Using the center line of the crossbeam as a reference, mark the installation position lines of each component of the main structure of the slewing chassis; place each component with its base plate facing upward on the cylindrical jig, and adjust the level and verticality of each component with the center crossbeam as a reference, requiring a levelness of ≤3mm and a verticality of ≤2mm; mark the excess trimming lines at the connection between each component and trim them off, trim the welding bevel at the butt joint; re-measure the levelness and verticality of each component, and after correcting and adjusting the size and position of each component with the center crossbeam as a reference, spot weld the positioning clips at the component connection, and weld the butt joints respectively; the flatness of the slewing chassis positive roller track beam after welding is less than 10mm;

[0024] S5: Assembly of front and rear rail bearing beams and central shaft connecting plates: Place the bottom plates of each component of the rail bearing beams upward on the main structure of the slewing chassis. Mark and trim the allowance with the central cross line of the central cross beam as the reference, ensuring that each partition of the rail bearing beam corresponds one-to-one with the internal stiffening plate of the slewing chassis; open the welding bevel at the joint; re-measure the horizontality and verticality of the front and rear rail bearing beams, requiring flatness ≤3mm and verticality ≤1.5mm; after correcting and adjusting the position of each component with the central cross line of the central cross beam as the reference, weld according to the blueprint requirements; after welding, mark the allowance machining line of the rail bearing surface for the first time, and use the allowance machining line as the reference to position and weld the center seat, ensuring that the flatness of the machined surface of the rail bearing beam and the machined surface of the center seat is controlled within ±1.5.

[0025] S6: Machining preparation: Before machining the rail bearing surface, the slewing chassis needs to be lifted 5-10cm off the tire to release stress; using the machining plane of the connecting plate of the slewing chassis center shaft as the reference, adjust the slewing chassis to be horizontal and draw the cross center line of the slewing chassis, and re-measure the machining line of the rail bearing surface; according to the roller rail marking in the process sheet and the requirements in the installation process, draw the rail inspection circle line;

[0026] S7: Machining: After verifying the level of the machining fixture, machine the thickness allowance of the front and rear bearing rail beams as required. During machining, multiple measurements are required, and the flatness must be measured after each cut. If any unexpected situation is found during machining, the number of measurements must be increased to ensure that the final measurement result meets the drawing requirements. The flatness must not exceed 1mm / 1m of the circumference. The rail installation area must meet the requirement of 0.2mm / 300mm along the width of the rail. The maximum height difference of the entire circle must not exceed 3mm, and there must be no tool marks in the rail installation area. The remaining machined surfaces shall be machined according to the blueprint requirements. Using the center of the slewing chassis as the reference, draw the installation position line of the positive roller with a diameter tolerance of ±3mm and a radius tolerance of ±2mm. Using the upper surface of the machined bearing rail beam as the reference, make a punch mark on the side of the slewing chassis with a size of 2000mm, which will serve as the height reference for the subsequent truss frame installation.

[0027] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A process for controlling the dimensional changes of a roller crane's slewing structure, characterized in that: The specific control process is as follows: S1: Manufacturing tolerance requirements for slewing chassis and lower support: The distance H from the upper surface of the slewing chassis support frame to the slewing chassis reference surface must meet a negative tolerance of 0 to -3; the flatness of the slewing chassis positive roller track beam after welding must be less than 10mm; the distance H between the machined surface of the slewing chassis track beam and the machined surface of the center seat must meet a tolerance of ±1.

5. S2: Center Crossbeam Assembly: Mark the center cross line of the center crossbeam on the ground and extend it outwards. Use this as a reference to mark the center lines of each component, and then arrange the cylindrical jig in place in sequence. Place each component of the center crossbeam on the cylindrical jig, and adjust the levelness and verticality of the components with the bottom plane of the center crossbeam as a reference. The levelness should be ≤3mm and the verticality ≤2mm. Use the center line of the center crossbeam as a reference to mark the allowance trimming lines at the connection between components, and trim them off. After ensuring that the opening size between components meets the requirements, spot weld the clamps at the connection of the components and correct the interface between the components to ensure that the interface is intact. After drawing the processing lines of the roller track surface, position and install the center seat. S3: Assembly of auxiliary beams and front and rear slewing support beams: Using the center line of the central crossbeam as a reference, mark the installation position lines of the spoke beams and front and rear slewing support beams; place each component base plate upwards on the cylindrical jig, and adjust the horizontal and vertical of each component using the center crossbeam as a reference, requiring horizontality ≤3mm and verticality ≤2mm; mark the excess trimming lines at the connection between each component and trim them off, trim the welding bevel at the butt joint; re-measure the horizontality and verticality of each component, and after correcting and adjusting the dimensions and positions of each component using the center crossbeam as a reference, spot weld the positioning clips at the component connection, and do not weld the butt joint yet; the distance H from the upper surface of the slewing chassis mechanism support frame to the slewing chassis reference surface meets the negative tolerance of 0 to -3. S4: Assembly of the main structure of the slewing chassis: Using the center line of the crossbeam as a reference, mark the installation position lines of each component of the main structure of the slewing chassis; place each component with its base plate facing upward on the cylindrical jig, and adjust the level and verticality of each component with the center crossbeam as a reference, requiring a levelness of ≤3mm and a verticality of ≤2mm; mark the excess trimming lines at the connection between each component and trim them off, trim the welding bevel at the butt joint; re-measure the levelness and verticality of each component, and after correcting and adjusting the size and position of each component with the center crossbeam as a reference, spot weld the positioning clips at the component connection, and weld the butt joints respectively; the flatness of the slewing chassis positive roller track beam after welding is less than 10mm; S5: Assembly of front and rear rail bearing beams and central shaft connecting plates: Place the bottom plates of each component of the rail bearing beams upward on the main structure of the slewing chassis. Mark and trim the allowance with the central cross line of the central cross beam as the reference, ensuring that each partition of the rail bearing beam corresponds one-to-one with the internal stiffening plate of the slewing chassis; open the welding bevel at the joint; re-measure the horizontality and verticality of the front and rear rail bearing beams, requiring flatness ≤3mm and verticality ≤1.5mm; after correcting and adjusting the position of each component with the central cross line of the central cross beam as the reference, weld according to the blueprint requirements; after welding, mark the allowance machining line of the rail bearing surface for the first time, and use the allowance machining line as the reference to position and weld the center seat, ensuring that the flatness of the machined surface of the rail bearing beam and the machined surface of the center seat is controlled within ±1.

5. S6: Machining preparation: Before machining the rail bearing surface, the slewing chassis needs to be lifted 5-10cm off the tire to release stress; using the machining plane of the connecting plate of the slewing chassis center shaft as the reference, adjust the slewing chassis to be horizontal and draw the cross center line of the slewing chassis, and re-measure the machining line of the rail bearing surface; according to the roller rail marking in the process sheet and the requirements in the installation process, draw the rail inspection circle line; S7: Machining: After verifying the level of the machining fixture, machine the thickness allowance of the front and rear bearing rail beams as required. During machining, multiple measurements are required, and the flatness must be measured after each cut. If any unexpected situation is found during machining, the number of measurements must be increased to ensure that the final measurement result meets the drawing requirements. The flatness must not exceed 1mm / 1m of the circumference. The rail installation area must meet the requirement of 0.2mm / 300mm along the width of the rail. The maximum height difference of the entire circle must not exceed 3mm, and there must be no tool marks in the rail installation area. The remaining machined surfaces shall be machined according to the blueprint requirements. Using the center of the slewing chassis as the reference, draw the installation position line of the positive roller with a diameter tolerance of ±3mm and a radius tolerance of ±2mm. Using the upper surface of the machined bearing rail beam as the reference, make a punch mark on the side of the slewing chassis with a size of 2000mm, which will serve as the height reference for the subsequent truss frame installation.

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