CN100411802C - A welding method for the rear sealing plate of an inflatable ring network cabinet - Google Patents

Abstract

A method for welding the rear sealing plate of an inflatable ring network cabinet, comprising: a. on the cabinet body of the ring network cabinet, welding the lath at the place where the rear sealing plate needs to be welded; b. installing one end of the pull rod on the front sealing plate, and A union is screwed on the threaded end facing the rear sealing plate, and a threaded process hole is opened on the union, and a process bolt is screwed into the threaded process hole; c. Pass the process bolt through the process hole on the rear sealing plate , and then install the entire rear sealing plate into the cabinet and against the slats; then shake the process bolt to insert the tie rod into the process hole on the rear sealing plate; d, spot weld the tie rod and the rear sealing plate; then weld the rear sealing plate and The joint of the cabinet body; finally remove the process bolts, and seal the joint between the tie rod and the rear sealing plate with seal welding. The invention can cancel the assembly hole on the rear sealing plate, so that the appearance of the whole ring network cabinet tends to be more beautiful, and the welding strength is guaranteed, so that the whole ring network cabinet can be maintenance-free for 30 years, has good air tightness, no leakage, and can give A sense of trust and security.

Description

A welding method for the rear sealing plate of an inflatable ring network cabinet

technical field

The invention relates to the technical field of preparation of an inflatable ring network cabinet, in particular to a welding method for a rear sealing plate of an inflatable ring network cabinet.

Background technique

Primary equipment such as load switches, grounding switches, current transformers, fuses, voltage transformers, and lightning arresters are installed in the ring network cabinet.

Involving the political, military, economic, cultural and disaster-safe strategic technical issues of the modern international society, the world has put forward higher and higher requirements for the urgency and reliability of power grid replacement, and has entered the Six Sigma (6σ) In the era of quality control, higher requirements are put forward for the quality of ring network cabinets.

At present, the preparation method of the ring network cabinet is to form the cabinet body first, and then install load switches, grounding switches, current transformers, fuses, voltage transformers, lightning arresters and other primary equipment in the cabinet, and finally seal the board after welding, and then carry out pumping. Vacuum and inflate. Due to such a preparation method, higher requirements are put forward for the welding of the rear sealing plate, that is, no welding sparks can occur in the cabinet. If welding sparks appear, it will damage the performance of the primary equipment in the cabinet, especially the electrical performance.

For the cabinet of 1000×535×1000×δ3 ring network cabinet, in order to avoid welding sparks in the cabinet during welding, open welding methods are currently used. For example, an assembly hole is opened on the back sealing plate, and the back sealing After the plate is welded to the cabinet body, load switches, grounding switches, current transformers, fuses, voltage transformers, lightning arresters and other primary equipment are installed through the assembly holes. After assembly, the assembly hole is sealed with a flange. Although such a welding method solves the problem of welding sparks entering the cabinet, it brings an unattractive appearance and a feeling of poor quality.

There are also some ring network cabinet manufacturers that change the lap structure of the rear sealing plate and the cabinet body, and use manual argon arc welding to weld the rear sealing plate. As we all know, argon arc welding has thicker weld scars at the welding place, which also affects the unsightly appearance and gives people the feeling that the quality is not good enough.

With the advancement of technology, many ring network cabinet manufacturers have begun to use advanced laser welding technology to weld the rear sealing plate. However, laser welding also has the following problems: 1. If the laser beam is welded at 90° to the rear sealing plate, although the rear sealing plate can be welded through to obtain a relatively high welding strength, welding sparks are easy to enter the cabinet. Damage to electrical components inside the cabinet. In order to prevent welding sparks from entering the cabinet, the laser beam and the rear sealing plate are welded at less than 90°, which will not penetrate the rear sealing plate, resulting in a decrease in welding strength. 2. For 1000×535×1000×δ3, in order to ensure that the box can withstand a vacuum of 10-6 and an air inflation of 0.03Mpa, it is generally necessary to add a tie rod between the front and rear sealing plates and make the tie rod and the front and rear sealing plates Connect firmly. In order to securely connect the tie rods to the back cover plate, the current practice is to open a process hole on the back cover plate for the pull rod to be inserted into the back cover plate. When installing the back cover plate, first insert the tie rod into the corresponding process hole. Apply welding again. Since in the laser welding process, it is necessary to ensure that the assembly gap between the plates is 0.1 mm, in this case, the process hole must match the pull rod and cannot be opened too large. Therefore, in the actual assembly process, insert the pull rod into the Crafting holes is a very difficult thing.

Contents of the invention

The technical problem to be solved by the present invention is to provide a welding method for the rear sealing plate of the inflatable ring main unit. The inflatable ring main unit welded by this welding method not only has a beautiful appearance, but also has high welding strength and high welding efficiency.

The technical problem to be solved by the present invention can be realized by the following technical solutions:

A method for welding the rear sealing plate of an inflatable ring main unit, the method comprising the following steps:

1. Welded slats

Weld the lath at the place where the rear sealing plate of the ring network cabinet needs to be welded, and ensure that the lath and the cabinet are close together without gaps;

2. Assemble the tie rod

Install one end of the tie rod on the front sealing plate, and screw a union on the threaded end of the tension rod facing the rear sealing plate, a threaded process hole is opened on the joint, and a process bolt is screwed into the threaded process hole;

3. Seal the board after assembly

First pass the process bolts through the process holes on the back cover plate, then install the whole back cover plate into the cabinet and make the inner edge of the back cover plate against the slats; then shake the process bolts to insert the pull rod into the back cover plate in the hole;

4. Welding

First use the laser beam to spot-weld the tie rod and the rear sealing plate, so that the tie rod and the rear sealing plate form a process connection; then use the laser beam to weld the joint between the rear sealing plate and the cabinet body, and adjust the welding process parameters to weld through the rear sealing plate, so that The back cover plate is firmly connected with the cabinet body; finally, the process bolts are removed, and the seam between the welding tie rod and the back cover plate is sealed with a laser beam.

In the present invention, the slats, the cabinet body and the rear sealing plate are made of materials with the same welding performance.

In order to prevent welding sparks from passing through the lath, the thickness of the lath is at least 1mm, preferably 1-3mm, more preferably 2-3mm. The same slats also need to have a certain width to prevent welding sparks from entering the cabinet. Generally speaking, the width of the slats is at least 3mm, preferably 10-20mm.

Due to the adoption of the above welding method, the present invention can cancel the assembly hole on the rear sealing plate, which not only makes the appearance of the whole ring network cabinet more beautiful, but also ensures the welding strength, and effectively prevents welding sparks from entering the cabinet. The entire ring cage can be maintenance-free for 30 years, with good airtightness and no leakage, which can give people a sense of trust and security. By installing the joint and the process bolt on the pull rod, the pull rod can be quickly inserted into the process hole of the rear sealing plate, which improves the efficiency of the whole welding process. The inflatable ring network cabinet produced by the welding method of the invention has higher appearance quality than similar inflatable ring network cabinets of ABB and Siemens.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is the casing welding structure schematic diagram of the inflatable ring network cabinet of the present invention;

FIG. 2 is an enlarged schematic diagram of the F place in FIG. 1;

Fig. 3 is the enlarged schematic diagram of the K place of Fig. 1;

Fig. 4 is a structural schematic diagram of the rear sealing plate of the inflatable ring main unit of the present invention.

Detailed ways:

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

Referring to Figures 1 to 4, a welding method for the rear sealing plate of an inflatable ring network cabinet is characterized in that the method includes the following steps:

1. Welded slats

On the cabinet body 1 of the ring network cabinet, the rear sealing plate 2 needs to be welded with the lath 3 at the welding place, and ensure that the lath 3 and the cabinet body 1 are close to each other without gaps; the lath 3 and the cabinet body 1 and the rear sealing plate 3 Use materials with the same welding properties. The thickness of the slats 3 is 3 mm and the width of the slats 3 is 15 mm. The length of slat 3 is determined according to needs;

2. Assemble the tie rod

One end of the pull rod 4 is installed on the front cover plate 5, and a joint 6 is screwed on the end of the pull rod 4 facing the rear cover plate 2 and having the thread 5, and a threaded process hole 7 is opened on the live joint 6. In this thread process A process bolt (not shown) is screwed into the hole 7;

3. Seal the board after assembly

First pass the process bolt through the process hole 8 on the back cover plate 2, then install the entire back cover plate 2 into the cabinet body 1 and make the inner edge of the back cover plate 2 against the slat 3; then shake the process bolt to make the pull rod 4 Insert it into the process hole 8 on the back cover plate 2;

4. Welding

First use the laser beam to spot weld the tie rod 2 and the back cover plate 4, so that the tie rod 2 and the back cover plate 4 form a process connection; Through the back cover plate 2, make the connection between the back cover plate 2 and the cabinet body 1 firmly; finally remove the process bolts, and use the laser beam to seal and weld the joint between the tie rod 4 and the back cover plate 2.

The selection of specific process parameters for laser welding is very easy for those skilled in the art, and will not be described in detail here.

Although the above-mentioned embodiment has described the present invention, for those skilled in the art, still can make multiple changes to this embodiment, therefore, every similar change that adopts the present invention all should be included in the scope of protection of the present invention .

Claims (7)

1. the welding method of an inflatable annular net cabinet back-sealing plate is characterized in that, this method comprises the steps:

A, welding lath

On the ring main unit cabinet, back shrouding needs weld welding lath, and guarantees to be close between lath and the cabinet, and is seamless;

B, assembling pull bar

Before pull bar one end is installed on the shrouding, and at pull bar towards the back shrouding and have on the end of screw thread and screw on an articulation, have a screw thread fabrication hole in the articulation, in this screw thread fabrication hole, screw in a service bolt;

C, assembling back shrouding

At first service bolt is passed in the fabrication hole of back on the shrouding, be installed into whole back closing plate in the cabinet again and make shrouding inner face edge, back prop up lath; Shaking service bolt then is inserted in the fabrication hole of back on the shrouding pull bar;

D, welding

With laser beam spot welding pull bar and back shrouding, make pull bar form technology and be connected earlier with the back shrouding; Again with the seam crossing of shrouding after the LASER BEAM WELDING and cabinet and by regulating shrouding behind the welding condition through welding, make between back shrouding and the cabinet firmly to be connected; Unload service bolt at last, with the seam crossing of laser beam seal welding pull bar with the back shrouding.

2. welding method according to claim 1 is characterized in that, described lath and cabinet and back shrouding adopt the material of same weld performance.

3. welding method according to claim 1 is characterized in that the thickness of described lath is at least at 1mm.

4. welding method according to claim 3 is characterized in that, the thickness of described lath is 1-3mm.

5. welding method according to claim 3 is characterized in that, the thickness of described lath is 2-3mm.

6. welding method according to claim 1 is characterized in that the width of described lath is at least at 3mm.

7. welding method according to claim 1 is characterized in that, the width of described lath is 10-20mm.

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