Internal clamping type flange on-site processing machine

Abstract

The invention relates to portable equipment for cutting a flange sealing surface on site. A main body adopts a slewing bearing structure, and the inner gear ring serves as a fixing ring and is supported and fixed in the end face of the pre-machined flange through the supporting legs. The main body of the driving motor is fixed on the outer ring and is meshed with the inner teeth of the gear ring through a motor output shaft pinion to push the outer ring and the tool arms on the outer ring to rotate so as to complete cutting operation. A center shaft fixing-driving structure is replaced with a ring structure, the length of the supporting legs is shortened, stability is improved (high stability is inevitably improved along with machining precision), meanwhile, a cutting force arm is shortened, cutting driving power and torque are reduced, the weight is greatly reduced, and the device is more suitable for field portability and installation operation.

Description

Technical Field

[0001] This invention relates to a portable device for on-site machining of flange sealing surfaces. Such devices require improved stability and cutting accuracy while minimizing weight, in order to meet portability, ease of installation, and machining quality requirements regarding surface roughness and flatness. Background Technology

[0002] Flanges are structural components frequently used in the connection of pressure vessels, valves, and pipeline systems in the petroleum, chemical, nuclear power, metallurgy, and energy industries. During use, the sealing surface may develop defects such as grooves, pits, collapsed edges, cracks, and warping due to factors such as medium corrosion, erosion, improper installation, extrusion deformation, and substandard dimensional accuracy of metal ring gaskets. In severe cases, this can lead to external leakage, affecting the safe and stable operation of the system.

[0003] Conventional flange machining equipment uses a central shaft sleeve internal clamping structure to fix the internal support of the equipment to the inner opening of the flange being machined. Simultaneously, a central shaft drive method is used to drive the cutter arm to rotate and cut (see structural diagram). Figure 1 During the maintenance of large flanges, the length of the internal support legs of this structure is close to the flange diameter. Figure 1 The L1 component in this structure results in a long support distance and poor stability; strengthening the support would increase the weight of the equipment, making it inconvenient to carry and install. Furthermore, the cutting arm of this structure is consistent with the radius of the cutting surface (L1). Figure 1 (L2), which requires a larger cutting torque. Both of these issues lead to increased equipment weight, making it inconvenient to carry and install in the field, and easily causing poor equipment stability, vibration, and excessive cutting roughness and flatness. Eliminating these defects is essential. Summary of the Invention

[0004] To overcome the structural defects of existing internal clamping flange processing machines, this invention abandons the industry-standard central shaft internal clamping fixing method and tool arm drive method. The main body adopts a slewing bearing structure, with the inner ring gear ring serving as a fixing ring and internally supported and fixed at the near end face of the pre-processed flange by four legs (or integer multiples thereof). The main body of the geared motor is fixed on the crossbeam connected to the outer ring. The motor output shaft pinion meshes with the inner teeth of the gear ring to reduce speed, driving the outer ring and the crossbeam above it, as well as the tool of the additional feed structure, to rotate, thus completing the cutting operation.

[0005] This invention changes the traditional structure of a flange center shaft fixed by four legs (or integer multiples thereof) along the radius, and adopts a slewing bearing internal gear ring structure, shortening the length of the internal support legs to the distance between the outer diameter of the inner ring and the inner diameter of the machined flange. Figure 2The L1 section is significantly shorter than the radius support. Furthermore, the annular structure, close to the flange diameter, reinforces and secures the support leg root, improving support stability. Simultaneously, the structural adjustment directly shortens the cutting arm to the distance between the outer diameter of the gear ring and the cutting surface. Figure 2 The L2 (lower limit) significantly reduces the required cutting power and torque, thus greatly reducing the overall weight of the machine.

[0006] The beneficial effects of this invention are: it achieves the goals of lower weight, higher stability, and higher precision machining, which better meets the needs of portable equipment for on-site installation, operation, and precision machining. Attached Figure Description

[0007] Figure 1 This is an assembly diagram of existing conventional flange processing equipment.

[0008] Figure 2 This is a front sectional view of the present invention in the assembled state.

[0009] The specific structural components in Figure 2 are named as follows: 01. Speed ​​regulating motor, 02. Drive gear, 03. Fixed inner ring gear, 04. Outer ring, 05. Power supply slip ring, 06. Crossbeam, 07. Feed screw, 08. Inner support leg, 09. Slide table, 10. Feed handwheel, 11. Tool holder, 12. Radial feed gear, 13. Dial wheel. Detailed Implementation

[0010] Support the inner support leg (08) on the inner wall of the flange near the end face. Align the flange end face with a dial indicator according to the undamaged position and fix the equipment securely. Power the slip ring (05) fixed in the center of the crossbeam (06) and connect the slip ring output to the speed-regulating motor (01). Move the radial feed wheel (12) to push the feed screw (07) for radial feed, rotate the feed handwheel (10) for axial feed, and the slide (09) moves the tool holder to align the tool tip with the inner side of the flange sealing surface to start cutting. Start the motor to rotate slowly and observe the removal of metal chips to determine if the axial depth of cut and rotational linear speed are appropriate.

[0011] It should be noted that the specific examples described in this specification are not intended to limit the present invention. The shape, name, etc. of the components may be different. All equivalent or simple changes made to the structure, features and principles described in this invention should be included within the scope of protection of this invention.

Claims

1. This invention relates to a portable device for machining flange sealing surfaces on-site.

2. The main body of this invention adopts a slewing bearing structure.

3. The internal gear ring of the slewing bearing structure is fixed as a retaining ring by the legs within the pre-machined flange end face.

4. The motor body is fixed on the outer ring.

5. The motor is powered by an electric slip ring.

6. The pinion on the motor output shaft meshes with the inner teeth of the gear ring, driving the outer ring and the crossbeam and auxiliary cutting tool to rotate, thus completing the cutting operation.

7. Radial feed is driven by a toothed or wheeled structure or an additional speed-regulating motor, resulting in stable cutting and high precision.

Images