Construction method of load measuring unit

Abstract

The invention relates to a construction method of a load measurement unit. The construction method comprises the following steps: S1, manufacturing a guide frame structure; s2, a support structure is manufactured, specifically, the support structure is divided into two parts to be manufactured, and the two parts are a truss structure and a base structure; s3, machining the support structure; according to the construction method, the load test units are manufactured in a segmented mode, each segment is constructed in the four stages of scribing, manufacturing, welding and overall machining, the flatness is accurately controlled through the scribing stage, the precision of a follow-up machining datum plane is ensured, flatness out-of-tolerance caused by welding deformation is avoided, overall scribing is conducted after welding is completed, and the construction efficiency is improved. Welding stress deformation is eliminated, the relative position precision of all key components is ensured, accumulative errors of step-by-step machining are reduced, and therefore the rework rate is effectively reduced, the construction efficiency is improved, and meanwhile high-precision control over the load measuring unit is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel structure construction, in particular to a construction method of a load measuring unit. BACKGROUND

[0002] When a newly built or repaired platform or ship is launched, a transfer system is used to transfer the platform or ship from the ground to a launching barge, and then the launching barge is used to transport the platform or ship to a suitable water area, and the launching barge is submerged to a certain extent to complete the launching of the platform or ship. During the transfer from the ground to the launching barge, the load on the launching barge is always changing, and the change in load can cause the ship to tilt. The load measuring arm is a supporting device of the launching barge. When the newly built platform or ship is loaded, the load measuring unit of the load measuring arm measures the load on the side of the launching barge, and then the four corner draft instruments are combined to adjust the loading of the ballast tank, so as to ensure that the main deck of the launching barge is flush with the wharf.

[0003] As shown in Figure 1 The load measuring arm includes a load measuring arm body 1 and a load measuring unit 2. The load measuring unit includes a mounting bracket and a hydraulic jack 24. The mounting bracket includes a guide frame 21 and a bracket structure. The bracket structure includes a truss 22 and a base 23. The truss 22 is arranged between the guide frame 21 and the base 23. The bottom end of the truss 22 is fixedly connected with the base 23. The top end of the truss 22 is flange-connected with the guide frame 21. After the installation of the bracket structure is completed, the hydraulic jack 24 is installed on the base 23 of the mounting bracket. The piston rod of the hydraulic jack 24 penetrates upward through the guide frame 21 and is connected with the load measuring arm body 1. The manufacturing precision of the load measuring unit mounting bracket directly affects the lifting displacement precision of the hydraulic jack piston rod and the testing accuracy.

[0004] Therefore, the present application provides a construction method of a load measuring unit to solve the above problems. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a construction method of a load measuring unit, which realizes high-precision manufacturing of the load measuring unit.

[0006] To solve the above technical problems, the technical scheme of the present application is as follows: a construction method of a load measuring unit, which is characterized by comprising the following steps: S1, guide frame structure manufacturing: guide frame structure line marking, control the flatness of the top plate and the flange seat during the manufacturing of the guide frame structure, ensure that the cover plate and the flange have sufficient machining allowance, and the lifting lug of the guide frame structure is manufactured as an assembly, then the guide frame structure is machined, and then the guide frame structure is installed, the guide frame structure is welded and inspected, and then the guide frame structure is installed with the shaft plate and the flange plate, the guide frame structure is marked as a whole, and the shaft plate, the flange plate, the center shaft sleeve and the top plate threaded hole are machined as a whole; S2, support structure manufacturing: the support structure is divided into two parts for manufacturing, which are truss structure and base structure. When manufacturing the truss structure, the flange surface and the lower opening level and flatness, as well as the span between the main pipes need to be controlled. When manufacturing the base structure, the center cross line is first drawn, and the sample punching hole is knocked out. After the base structure is manufactured, the machine processing of the bottom plate is carried out, then the upper rigid jig is fixed to the base by using the clamping plate to ensure the flatness of the bottom plate. The truss structure is installed on the base for welding, and the horizontal and flatness of the flange plane of the truss structure is controlled during welding. S3, support structure machining: after the support structure is manufactured, the whole line is drawn, the upper flange of the support structure is machined, the guide frame structure is pre-assembled, the corresponding support hinge point machining line is drawn according to the center shaft hole of the guide frame center shaft sleeve, the support hinge point is machined, and the hydraulic jack is installed. The pre-tightening force of the flange bolt between the guide frame and the support is applied.

[0007] Further, in the step S1, when the guide frame structure is drawn, the structure line deviation is required to be less than 0.5mm.

[0008] Further, in the step S1, when the guide frame structure is manufactured, the overall flatness deviation of the top plate and the flange seat is less than 2mm.

[0009] Further, in the step S2, after the truss structure and the base structure are welded, the overall flatness deviation of the flange of the truss structure should be less than 2mm, and the flatness of the bottom plate of the base structure is controlled within 1mm.

[0010] Further, in the step S2, when the truss structure is manufactured, the span deviation between the main pipes is controlled within ±1mm.

[0011] Further, in the step S3, before machining the support hinge point, a process hole is formed on one side plate of the base structure. After the support hinge point is machined, the welding is restored, and the welding seam needs to be detected by ultrasonic detection and magnetic powder detection.

[0012] The advantages of the present application are: The construction method of the present application divides the load test unit into segments for manufacturing, and each segment is divided into four stages of line drawing, manufacturing, welding and overall machining for construction. The flatness is accurately controlled in the line drawing stage to ensure the accuracy of the reference surface in the subsequent machining, avoid the flatness deviation caused by welding deformation, and eliminate the welding stress deformation after welding to ensure the relative position accuracy of each key component and reduce the cumulative error of step-by-step machining, thereby effectively reducing the rework rate, improving the construction efficiency, and realizing high-precision control of the load measurement unit. BRIEF DESCRIPTION OF DRAWINGS

[0013] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0014] Figure 1 Structure diagram of the load measuring arm.

[0015] Figure 2 Flow chart of the construction method of the load measuring unit of the present application.

[0016] Figure 3 Construction diagram of the guide frame of the present application.

[0017] Figure 4 Construction diagram of the truss structure of the present application.

[0018] Figure 5 Construction diagram of the base structure of the present application. DETAILED DESCRIPTION

[0019] In order to make the technical means and effects taken by the present application to achieve the predetermined purposes more clear, the specific embodiments, structures, features and effects of the present application are described in detail below in combination with the drawings and preferred embodiments.

[0020] EMBODIMENT The present embodiment provides a construction method of a load measuring unit, as shown in the following steps: Figure 2 S1, guide frame structure manufacturing: as shown in the following steps: S1.1, guide frame structure layout: as shown in the following steps: Figure 3 S1.1.1, guide frame 21 structure layout: as shown in the following steps: the guide frame 21 structure layout deviation is required to be less than 0.5mm, the flatness of the top plate 211 and the flange seat 212 is controlled during the manufacturing of the guide frame 21 structure, the overall flatness deviation of the top plate 211 and the flange seat 212 is less than 2mm, the sufficient machining allowance of the cover plate 213 and the flange is ensured, the lifting lug of the guide frame 21 structure is machined as an assembly, then installed, the guide frame 21 structure is welded and inspected, then the card shaft plate 214 and the flange plate 215 are installed, the guide frame 21 structure is overall layout, and the card shaft plate 214, the flange plate 215, the center shaft sleeve 216 and the top plate 211 threaded hole are overall machined; S2, bracket structure manufacturing: as shown in the following steps: Figures 4-5As shown, the bracket structure is divided into two parts for manufacturing, which are the truss 22 structure and the base 23 structure. When manufacturing the truss 22 structure, the flange surface and the lower opening level and flatness need to be well controlled, and the span deviation between the main pipes 221 needs to be controlled within ±1mm. When manufacturing the base 23 structure, the center cross line is first drawn, and the sample punching hole is knocked out. After the base 23 structure is manufactured, the machine processing of the bottom plate 231 plane is performed. Then the upper rigid jig frame is fixed to the base 23 by using the clamping plate to ensure the flatness of the bottom plate 231. The truss 22 structure is installed on the base 23 for welding. When welding, the horizontal and flatness of the flange 222 upper plane of the truss 22 structure need to be controlled. After the truss 22 structure and the base 23 structure are welded, the overall flatness deviation of the four flanges 222 of the truss 22 structure should be less than 2mm, and the flatness of the bottom plate 231 of the base 23 structure needs to be controlled within 1mm. S3, bracket structure machining: after the bracket structure is manufactured, the overall line is drawn, the upper flange 222 of the support structure is machined, the guide frame 21 structure is pre-assembled, the corresponding bracket hinge point machining line is drawn according to the center shaft hole of the guide frame 21 center shaft sleeve 216, the process hole is opened on one side plate of the base 23 structure, the bracket hinge point 232 is machined, and after the bracket hinge point 232 is machined, the process hole is welded to restore. The process hole weld needs to be ultrasonic detected and magnetic powder detected. After the hydraulic jack 24 is installed, the flange bolt 25 between the guide frame 21 and the bracket is pre-tightened.

[0021] The load measuring unit is manufactured by segmenting and dividing the line, manufacturing, welding and overall machining four stages. The flatness is accurately controlled by the line drawing stage to ensure the accuracy of the subsequent machining reference surface, avoid the flatness out-of-tolerance caused by welding deformation, eliminate the welding stress deformation after welding, ensure the relative position accuracy of each key component, reduce the cumulative error of step-by-step processing, thereby effectively reducing the rework rate, improving the manufacturing efficiency, and realizing high-precision control of the load measuring unit.

[0022] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to make equivalent embodiments with equivalent changes, but as long as it does not deviate from the technical solution of the present application, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A method of constructing a load measuring unit, characterized by: It comprises the following steps: S1, guide frame structure production: guide frame structure scribe, control the flatness of the top plate and flange seat when the guide frame structure is produced, ensure that the cover plate and flange have sufficient machining allowance, the lifting lug of the guide frame structure is machined as an assembly first, then installed, the guide frame structure is welded and reported, the check is completed after the installation of the card shaft plate and the flange plate, the guide frame structure is scribed as a whole, and the card shaft plate, the flange plate, the center shaft sleeve and the top plate threaded hole are machined as a whole; S2, support structure production: the support structure is divided into two parts for production, which are truss structure and base structure, the flange surface and the lower opening level and flatness, and the span between the main pipes need to be controlled when the truss structure is produced, the center cross line is scribed first when the base structure is produced, and the sample punching hole is knocked out, the base structure is machined after the base structure is produced, then the upper rigid jig frame is fixed with the base plate, the flatness of the base plate is ensured, the truss structure is installed on the base for welding, and the flange surface level and flatness of the truss structure are controlled during welding; S3, support structure machining: after the support structure is produced, the whole is scribed, the upper flange of the support structure is machined, the guide frame structure is preassembled, the corresponding support hinge point machining line is drawn according to the center shaft hole of the guide frame center shaft sleeve, the support hinge point is machined, and the hydraulic jack is installed, then the flange bolt between the guide frame and the support is pre-tightened.

2. The load cell building method according to claim 1, characterized in that: In the step S1, when the guide frame structure is scribed, the structure scribing deviation is required to be less than 0.5mm.

3. The load cell building method according to claim 1, wherein: In the step S1, when the guide frame structure is produced, the overall flatness deviation of the top plate and the flange seat is less than 2mm.

4. The load cell building method according to claim 1, wherein: In the step S2, after the truss structure and the base structure are welded, the overall flatness deviation of the flange of the truss structure should be less than 2mm, and the flatness of the base plate of the base structure is controlled within 1mm.

5. The load cell building method according to claim 1, wherein: In the step S2, when the truss structure is produced, the span deviation between the main pipes is controlled within ±1mm.

6. The load cell building method according to claim 1, wherein: In the step S3, before machining the support hinge point, a process hole is opened on one side plate of the base structure, and after the support hinge point is machined, it is welded back, and the weld needs to be detected by ultrasonic detection and magnetic powder detection.

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