A split ventilation device welding tool and air duct welding process

Abstract

The present invention provides a split ventilation device welding tool and air duct welding process, the diameter of the circular plate is slightly smaller than the diameter of the circular hole of the rear baffle of the ventilation device, the pad is welded on the circular plate, the outer edge of the pad protrudes from the circular plate, the pad is welded with a support plate, the support is welded with a motor mounting plate, and the center of the circular plate and the center of the motor mounting plate are on the same axis. The present invention solves the problems of large installation size deviation of the split ventilation device, low assembly production efficiency, unstable product quality, etc.

Description

Technical Field

[0001] The invention belongs to the field of mechanical equipment, and in particular relates to a split ventilation device welding tool and an air duct welding process. Background Art

[0002] In the manufacturing of locomotive centrifugal ventilation devices, there are split ventilation devices and integrated ventilation devices. An integrated ventilation device is one in which the air guide hood is directly installed on the shell by bolts; a ventilation device without a shell structure, in which the air guide hood needs to be installed separately on the air duct, is called a split ventilation device. For an integrated ventilation device, the air guide hood is installed directly by opening a hole in the shell, and the installation accuracy is relatively easy to ensure, and the installation difficulty is relatively small. For split ventilation devices in which the motor shaft is in a horizontal position, the impeller and the air guide hood are usually installed separately on both sides of the air duct partition, which makes it difficult to ensure that the axial and radial clearances can meet both the product quality requirements and the production efficiency requirements, and it is impossible to achieve the best process level.

[0003] In the past, the welding and assembly of this type of ventilation device usually adopts the following methods:

[0004] 1) Weld the rear baffle plate and housing mounting plate of the ventilation device to the air duct frame according to the dimensions on the drawing;

[0005] 2) Install the motor and impeller on the motor mounting plate;

[0006] 3) Install the above components on the housing mounting plate from the front with bolts;

[0007] 4) Finally, install the air guide cover behind the rear baffle of the ventilation device;

[0008] 5) Adjust the radial position of the air guide cover so that the radial clearance between the air guide cover and the impeller is equal everywhere.

[0009] The biggest disadvantage of this production process is that since the shell mounting plate is first welded to the air duct by scribing, there is a great possibility of axial and radial dimensional deviations, which directly leads to a very small adjustment margin for the radial clearance between the air guide cover and the impeller during assembly and the axial clearance cannot be adjusted. The technical requirements for assembly are very high, which is extremely difficult in actual production and gradually cannot meet the needs of the production cycle. Summary of the invention

[0010] To solve the above problems, the present invention provides a split ventilation device welding tool to solve the problems of large installation dimension deviation, low assembly production efficiency, unstable product quality, etc. The present invention also provides a duct welding process, which eliminates the poor precision marking method, is more practical, efficient and reliable, can reduce the difficulty of installation, and reduce the time of adjusting the gap during installation.

[0011] The technical solution adopted by the present invention is: a split ventilation device welding tool, the diameter of the circular plate is slightly smaller than the diameter of the circular hole of the rear baffle of the ventilation device, the pad is welded on the circular plate, the outer edge of the pad protrudes from the circular plate, the pad is welded with a support plate, the support plate is welded with a motor mounting plate, and the center of the circular plate and the center of the motor mounting plate are on the same axis.

[0012] Further optimization is performed so that the diameter of the circular plate is 0.5 mm to 1.5 mm smaller than the diameter of the circular hole of the rear baffle of the ventilation device.

[0013] Further optimization is performed, with 4 support plates of the same size, all distributed and welded on the pad, and the length of the support plate is the axial dimension L of the motor mounting plate when the pad is against the rear baffle of the ventilation device (L is the length that meets the design requirements of the drawing), with a tolerance of ±0.4mm.

[0014] A split ventilation device air duct welding process, characterized in that it includes the following steps:

[0015] S1: Connect the housing mounting plate to the corresponding position of the motor mounting plate of the split ventilation device welding tooling through a bolt assembly;

[0016] S2: Place the rear baffle of the ventilation device against the back of the air duct frame, and at the same time, insert the components described in S1 from the front of the air duct frame;

[0017] S3: Use a rubber hammer to gently tap the assembly in S1, so that the circular plate of the assembly is embedded in the circular hole of the rear baffle of the ventilation device, and the pad is closely against the rear baffle of the ventilation device;

[0018] S4: Perform positioning welding, and weld the rear baffle plate and the housing mounting plate of the ventilation device to the air duct frame in the state described in S3;

[0019] S5: After the positioning weld has cooled, remove the bolt assembly and then remove the split ventilation device welding tooling.

[0020] The beneficial effects of the present invention are:

[0021] 1. Easy to install and improve work efficiency;

[0022] 2. Ensure the assembly quality of ventilation devices;

[0023] 3. Use welding tools to establish the dimensional connection between the rear baffle and the air duct mounting plate, which increases welding accuracy, reduces assembly time, and makes the assembly quality stable and reliable;

[0024] 4. Optimize the welding process sequence of the rear baffle and the air duct mounting plate, remove the marking process before welding, and greatly reduce the dimensional error. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional diagram of the welding tooling for the split ventilation device;

[0026] Figure 2 It is a schematic diagram of the assembly and use of the welding tooling for the split ventilation device;

[0027] Figure 3 It is a schematic diagram of the rear baffle of the ventilation device;

[0028] Figure 4 This is a schematic diagram of the welding tooling for the rear baffle of the ventilation device and the split ventilation device.

[0029] Reference numerals: 1-circular plate 2-backing plate 3-support plate 4-motor mounting plate 5-ventilation device rear baffle 6-air duct frame 7-housing mounting plate DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings:

[0031] like Figure 1 and Figure 2 The present invention is a split-type ventilation device welding tool. The diameter of the circular plate 1 is slightly smaller than the diameter of the circular hole of the ventilation device rear baffle 5 by 0.5mm to 1.5mm, which is convenient for inserting into the circular hole of the ventilation device rear baffle 5 for positioning. The pad 2 is welded on the circular plate 1, and the outer edge of the pad 2 protrudes from the circular plate. The pad 2 must have a protruding part than the circular plate 1. When the circular plate 1 is inserted into the ventilation device rear baffle 5, the protruding part of the pad 2 can lean against the front of the ventilation device rear baffle 5 to play an axial positioning role. Four support plates 3 of the same size are evenly distributed and welded on the pad 2, and a motor mounting plate 4 is welded on the support plate. The center of the circular plate 1 and the center of the motor mounting plate 4 are on the same axis to ensure that the coaxiality of the circular plate 1 and the motor mounting plate 4 is not greater than 0.5.

[0032] The support plate length is the axial dimension L of the motor mounting plate when the backing plate rests on the rear baffle of the ventilation device, with a tolerance of ±0.4mm.

[0033] During welding, firstly, four housing mounting plates 7 are mounted to corresponding positions of the motor mounting plate 4 using bolt assemblies.

[0034] Will Figure 3 The rear baffle plate 5 of the ventilation device shown is placed behind the air duct frame 6, and then the split ventilation device welding tool is placed from the front of the air duct frame 6. Use a rubber hammer to gently tap the tool, such as Figure 4 As shown, the circular plate 1 of the tooling is embedded in the circular hole of the ventilating device rear baffle 5, and the backing plate 2 is close to the ventilating device rear baffle 5. At this time, the positions of the ventilating device rear baffle 5 and the four housing mounting plates 7 are all determined.

[0035] After the position is determined, positioning welding is performed to weld the housing mounting plate 7 and the rear baffle plate 5 of the ventilation device to the air duct frame 6 .

[0036] After the positioning weld has cooled, remove the bolts and carefully remove the split ventilation device welding tooling. The ventilation device air duct welding work is now complete.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A split type ventilation device welding tool, characterized in that: The diameter of the circular plate (1) is slightly smaller than the diameter of the circular hole of the rear baffle (5) of the ventilation device; the pad (2) is welded on the circular plate (1); the outer edge of the pad (2) protrudes from the circular plate (1); a support plate (3) is welded on the pad (2); a motor mounting plate (4) is welded on the support plate (3); the center of the circular plate (1) and the center of the motor mounting plate (4) are on the same axis; the length of the support plate (3) is the axial dimension L of the motor mounting plate (4) when the pad (2) rests on the rear baffle (5) of the ventilation device; the tolerance is ±0.4 mm; the diameter of the circular plate (1) is 0.5 mm to 1.5 mm smaller than the diameter of the circular hole of the rear baffle (5) of the ventilation device; the support plates (3) are 4 pieces with the same size and are evenly distributed and welded on the pad (2).

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