Force bearing structure suitable for limited installation operation space and assembling method

Abstract

The invention relates to the field of power system test run, in particular to a force bearing structure suitable for a limited installation operation space and an assembling method. The device comprises a base structure, a main body bearing structure, a nut group fixing device, a fixing bolt, a nut and a test body, threads are directly tapped on a force-bearing structure main body, on one hand, a plurality of butt joint holes of a test body and the force-bearing structure threads are prone to dislocation, and on the other hand, due to the fact that the material strength of the main body structure is lower than that of bolts, the force-bearing structure threads are prone to losing efficacy when the main body structure is disassembled for many times or bears severe working conditions, and structural safety is affected. And if the force bearing structure is connected with the test body through bolts and nuts, a narrow space is formed between a connecting hole in the force bearing structure and the test body, and assembly operation is difficult to carry out. The special structure designed by the invention can effectively solve the problem of position dislocation of multiple butt joint holes, the problem of insufficient strength, and the problem of inconvenient installation in a narrow space.

Description

Technical Field

[0001] The present invention relates to the field of power system commissioning tests, and a load-bearing structure and assembly method applicable to a limited installation operation space. Background Art

[0002] When a test body conducts a power system commissioning test and is tightly connected to ground equipment, high-strength fasteners are often used for assembly. However, the butt bolts between the test body and the ground equipment have a relatively small difference in radial dimension from the outer envelope circle of the test body, and the height dimension from the lower end face of the test body to the butt surface is relatively large. Therefore, a relatively narrow depth space is formed between the test body and the ground equipment, making it difficult to tightly assemble the product. For example, when threading the ground equipment, due to the large structure of the ground equipment, Q235 or Q355 is usually selected. Therefore, when threading the ground equipment, due to the uneven force on the thread teeth and the strength of the material, the threads of the ground equipment are prone to deformation and failure, affecting the safety and reliability of the power system commissioning test.

[0003] In order to ensure safety and reliability and at the same time solve the problem of inconvenient assembly, a load-bearing structure and assembly method applicable to a limited installation operation space are invented. This method designs a nut group fixing device to solve the situation where the strength of the main structure is relatively low. High-strength nuts can be installed inside the nut group fixing device as needed, so as to ensure the same strength of the nut bolts. And this fixing device can play a limiting role when tightening the bolts, thus solving the problem of inconvenient operation in a narrow space. Summary of the Invention

[0004] Aiming at the problems of difficult operation or insufficient strength in the previous structural forms, the present invention provides a brand-new fixing method, aiming to ensure the strength of the fasteners, thus ensuring the test safety and at the same time realizing the convenience of installation.

[0005] The present invention is realized through the following technical solutions:

[0006] A load-bearing structure applicable to a limited installation operation space of the present invention includes: a basic structure, a main load-bearing structure, a nut group fixing device, fixing bolts, nuts, and a test body. The main load-bearing structure is provided with a plurality of bolt holes for docking with the nut group fixing device; the nut group fixing device is limited and fixedly connected to the main structure through a pin shaft and fasteners. The fixing device is provided with a plurality of nut grooves; the nut grooves can realize fine adjustment of the nut position through a special structure, and when tightening, the side of the fixing device realizes the limiting and anti-loosening of the nut through a thimble screw. The end of the thimble screw has a slotted head and the front end is conical, which is convenient for guiding during installation. The butt surface of the test body is provided with a plurality of docking holes, and the main load-bearing structure is also provided with a plurality of docking holes. The bolts pass through the docking holes and are tightly connected to the nuts inside the fixing device.

[0007] Among them, the load-bearing structure and assembly method applicable to a limited installation operation space are characterized in that a pin shaft and a hole are used for limiting between the nut group fixing device and the main structure, and the fitting method adopts an interference fit.

[0008] Among them, a number of nut grooves are provided on the nut group fixing device, and it is characterized in that a gap is left between the nut groove and the nut, so as to solve the problem of misalignment between the docking hole and the nut; the shape of the nut groove is rectangular, so that when tightening the bolt, the nut groove plays a role in fixing the wrench, thus solving the problem of being unable to fix the nut in a narrow space. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0010] Figure 1 Overall view of the load-bearing structure with a limited installation operation space in the embodiment of the present invention

[0011] Figure 2 Partial assembly drawing of the nut group fixing device, nut groove and main structure in the embodiment of the present invention

[0012] Figure 3 Layout diagram of the nut groove and the nut in the embodiment of the present invention

[0013] Figure 4 Assembly flow chart in the embodiment of the present invention

[0014] In the figure: 1 - basic structure, 2 - main structure, 3 - test body, 4 - docking bolt, 5 - nut group, 6 - nut group fixing device, 601 - nut groove, 602 - thimble screw, 7 - fixing device limit pin, 8 - device fixing bolt, 9 - device fixing nut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0016] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0017] In addition, the technical features designed in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0018] Figure 1 Overall view of the load-bearing structure for the limited installation operation space in the embodiment: As Figure 1 shown, this embodiment provides an overall view of the load-bearing structure for the limited installation operation space, including: test body 3; main structure 2; nut group fixing device 6; nut group 5; side top screw 602; several docking holes are provided on the test body 3 and the main structure 2, and they are docked through bolts and nuts. The nut group fixing device 6 is provided with a nut groove 601, the nut groove 601 is a quadrilateral cavity, the nut is placed in the quadrilateral cavity of the nut groove 601, and the quadrilateral cavity is rectangular. There is a round hole at the bottom of the nut groove 601, and the diameter of the round hole is not less than the outer diameter of the bolt plus the adjustment dimension, so that the bolt can be assembled in place smoothly. The surface of the nut groove 601 close to the outside of the main body is tapped with threads, and the side top screw can be screwed in to realize the rotational locking of the nut.

[0019] Figure 2 Partial assembly view of the nut group fixing device 6, nut groove 601 and main structure 2: As Figure 2 shown, the nut group fixing device 6 and the main structure 2 are limited by pin holes. The nut group fixing device 6 is provided with several nut group grooves 601, and each nut is pre-installed in each groove. There is a little gap between the nut and each nut groove 601, so that the nut can be adjusted in position to facilitate compensating for the misalignment problem between the bolt docking hole and the nut position caused by errors.

[0020] Figure 3 Layout diagram of the nut groove 601 and nuts in the embodiment of the present invention: As Figure 3As shown in the figure, the nut groove 601 is designed as a rectangle. The short side dimension of this rectangle is B, and the long side dimension is A. The long side dimension A of the rectangle is slightly larger than the distance e between two opposite vertex points of the nut, and the short side dimension B of the rectangle is slightly larger than the parallel side a of the nut but smaller than the distance e between two opposite vertex points of the nut, such that when the nut rotates a little angle, it is blocked by the nut groove 601. Thus, only by rotating the bolt can the fixation be achieved. This structure enables the nut end to be limited without other tools, thereby solving the problem of realizing the docking operation in a limited space.

[0021] Figure 4 The following is the assembly flow chart in the embodiment of the present invention:

[0022] S1: Place the main structure on the installation tooling table.

[0023] S2: Use a crane to lift the nut group fixing device 6 onto the lift truck.

[0024] S3: Place nuts at the positions of the nut grooves 601 on the nut group fixing device 6. Note that one pair of opposite sides of the nut is aligned with the short side of the nut groove 601. Confirm that nuts are placed in all the nut grooves 601 on the nut group fixing device 6, and place the limit pins at the corresponding positions on the nut group fixing device 6.

[0025] S4: The hydraulic lift moves under the main structure and finely adjusts the position to make it roughly aligned.

[0026] S5: Raise the hydraulic lift until the nut group fixing device 6 approaches the main structure 2, and observe the relative positions of the nut group fixing device 6 and the main structure 2 until the position of the limit pin on the nut group fixing device 6 is aligned with the corresponding position of the limit hole on the main structure 2. Continue to lift the lift to make the nut group fixing device 6 fit with the main structure 2.

[0027] S6: Screw on the fasteners of the nut group fixing device 6 and the main structure 2.

[0028] S7: Install the other nut group fixing devices 6 one by one according to the steps S2 - S6.

[0029] S8: Install the main structure 2 on the vertical frame. Use a traveling crane to install the main structure 2 on the crossbeam of the vertical frame, and then fix it with fasteners.

[0030] S9: Lift the test body 3 onto the main structure 2. Insert the docking bolts into a docking hole of the test body 3 and the corresponding docking hole of the main structure 2 in sequence. The front end of this bolt is designed with a tapered angle, which is convenient for centering and tightening with the position of the nut installed in the nut group fixing device 6. At this time, no torque is applied during the installation process of the bolt and the nut of the fixing device.

[0031] S10: Screw the side top screws 602 into the bolt holes on each side of the main structure until it can no longer be screwed.

[0032] S11: Apply torque to the docking bolts in step S9.

[0033] S12: Tie a safety wire to the heads of the connecting bolts between the main structure and the test body.

Claims

1. A load-bearing structure and assembly method suitable for limited installation and operation space, characterized in that: The invention comprises a basic structure (1), a main structure (2), a test body (3), a butt bolt (4), a nut group (5), a nut group fixing device (6), a nut groove (601), a thimble screw (602), a fixing device limit pin (7), a fixing bolt (8) and the like.

2. A load-bearing structure suitable for limited installation and operation space according to claim 1, characterized in that The foundation structure (1) is connected to a ground anchor point, the main structure (2) is fixedly connected to the foundation structure (1), and the test body (3) needs to be docked with the main structure (2).

3. The main structure (2) according to claim 1-2 is docked with the test body (3), characterized in that The nut group (5) is fixed to the main structure (2) by a nut group fixing device (6); the nut group device is limited by a fixing device limiting pin (7) and is fixed by a device fixing bolt (8) and a device fixing nut (9).

4. The nut group fixing device (6) according to claims 1-3, characterized in that The fixing device is provided with a plurality of nut grooves (601); after assembly, a group of nuts of the same fixing device is more reliable than a single nut structure, and the fastener has a better stopping effect during the assembly process.

5. The nut groove (601) according to claims 1-4 is a quadrilateral cavity, and the quadrilateral cavity is a rectangle.

6. The rectangular cavity of the nut slot (601) according to claims 1-5, the long side dimension B of the rectangle is slightly larger than the distance e between the two points of the nut's vertical angle, and the short side dimension A of the rectangle is slightly larger than the parallel side a of the nut, but smaller than the distance e between the two points of the nut's vertical angle, so that the nut is stuck by the nut slot (601) when it is turned a little, so that the fixing can be achieved by simply turning the bolt, solving the problem of being unable to operate in a narrow space. The gap between the nut slot and the nut facilitates the fine adjustment of the position of the nut.

7. Based on claims 1-6, there is a circular hole at the bottom of the nut groove 601, and the diameter of the circular hole is slightly larger than the outer diameter of the bolt plus the adjustment size, so that the bolt can be smoothly assembled into place, and the length of the bolt can be appropriately lengthened to ensure more reliable installation.

8. Based on the nut groove (601) of claims 1, 4, 5, and 6, the surface of the nut groove (601) close to the outer side of the main body is tapped with threads, and a side top screw can be screwed in to lock the nut and prevent it from loosening.

9. A load-bearing structure and assembly method suitable for limited installation and operation space as described in claim 1 is mainly implemented through the following steps. S1: Place the main structure on the installation table. S2: Use a crane to lift the nut group fixing device 6 onto a lifting vehicle, with the side of the nut group fixing device 6 with the nut groove 601 facing upward. S3: Place nuts on all the nut slots 601 on the nut group fixing device 6, making sure that one opposite side of the nut is aligned with the short side of the nut slot 601, confirm that all the nut slots 601 on the nut group fixing device 6 are filled with nuts, and place the limit pin at the corresponding position of the nut group fixing device 6. S4: The hydraulic lift moves under the main structure and fine-tunes the position so that it is roughly aligned. S5: Raise the hydraulic lift until the nut group fixing device 6 is close to the main structure 2, and observe the relative position of the nut group fixing device 6 and the main structure 2, until the position of the limit pin of the nut group fixing device 6 is aligned with the corresponding position of the limit hole of the main structure 2, and continue to lift the lift to make the nut group fixing device 6 fit with the main structure 2. S6: Screw on the fasteners between the nut group fixing device 6 and the main structure 2. S7: Install other nut group fixing devices 6 one by one according to steps S2-S6. S8: Install the main structure 2 on the frame, install the main structure 2 on the crossbeam of the frame by means of a crane, and then fix it by means of fasteners. S9: Lift the test body 3 onto the main structure 2, and insert the docking bolts into a docking hole of the test body 3 and the corresponding docking hole of the main structure 2 in turn. The taper angle design of the front end of the bolt is convenient for aligning and tightening the nut position installed in the nut group fixing device 6. At this time, no torque is applied during the installation process of the bolt and the nut of the fixing device. S10: Screw the side top screws 602 into the bolt holes on each side of the main structure. Apply anti-loosening glue to the threads before screwing them in until they can no longer be screwed in. S11: Apply torque to the butt bolts in step S9. S12: Install a fuse on the head of the bolt connecting the main structure and the test body.

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