RU202160U1 - Device for removing finning on the surface of a finned tube - Google Patents

Abstract

The utility model relates to the field of mechanical engineering, namely to devices for obtaining and manufacturing ribbed surfaces on parts of heat exchangers, air coolers, and can also be used on universal turning (trimming) equipment for removing ribbing on the surface of a ribbed pipe. The device for removing finning on the surface of the finned tube includes a cutting part with a holder. The device additionally includes a main part, which contains a bushing with a seat on one side with the possibility of installing a cutting part and an internal groove on the other side with the possibility of installing a threaded bushing with a central hole, the bushing has a central hole and is equipped with two through holes located opposite each other from above and from the bottom of the sleeve, the cutting part is made in the form of a cylindrical body with a central hole and technological pockets, holders tightened by bolts with brazed plates are installed in the technological pockets, while the holders are equipped with through grooves with the ability to move the holders within the through grooves, into the central hole a threaded sleeve inserted a centering pin, which is a hollow cylinder with radii at the end, a transitional threaded section with a limiting shoulder and a tapered shank, with the possibility of placing the end part of the centering pin in the central hole cutting part, and the transition threaded section - in the threaded sleeve. The proposed device makes it possible to improve the quality of work on the removal of finning, expands the range of processing the diameters of the finned surfaces of pipes, and also reduces material and labor costs. 2 ill.

Description

The utility model relates to the field of mechanical engineering, namely to devices for obtaining and manufacturing ribbed surfaces on parts of heat exchangers, air-cooled devices and can also be used on universal turning (trimming) equipment for removing ribbing on the surface of a ribbed pipe.

Known device for cleaning the outer surface of products of circular cross-section (Patent RU No. 617086, IPC В08В 3/10, publ. 07/30/1978), consisting of a cylindrical body, inside which are sequentially placed in rows of cleaning elements made in the form of cylindrical rods-exciters cavitation, and the cylindrical rods of one of the rows are made elliptical in cross-section and are installed with the possibility of rotation around their axes. Each of the cleaning elements has two coaxial bushings, between which rods-exciters of cavitation are radially located. Liquid under pressure is supplied to the body of the device and flows around cylindrical rods and rods having an elliptical cross-section. Giving the fluid flow a speed higher than the critical one causes the phenomenon of cavitation, due to which the surface is cleaned from contamination. The intensity of the cleaning process is adjusted by turning the elliptical rods.

Also known is a device for removing the external burr (Patent RU No. 1016107, IPC V23K 11/04, publ. 07.05.1983), containing a displacement drive in the form of power cylinders, a strip clamping mechanism, a cutting head fixed on the rods of the power cylinders, when Moreover, in order to expand the functionality and increase productivity, the strip clamping mechanism is equipped with a carriage with a vertical guide, contains two wedges, one of which has a T-shape with shanks installed in the vertical guide of the carriage, the cutting head contains a body with a cage having an axial hole conical shape, cylindrical wedges installed in the holder with the ability to move along its conical surfaces, and carrying cutters made L-shaped, a spring-loaded pusher installed with the possibility of interacting with the cutters and kinematically connected with the strip clamping mechanism.

A common disadvantage is the complex design, the presence of a large number of assemblies and parts required to be manufactured to a high quality of accuracy. The power cylinders of the device are very sensitive to the quality and condition of the working fluid, and if it is contaminated, they can quickly fail.

Also known is the working body of the machine for removing insulation from the outer surface of the pipeline (Patent RU No. 2395353, IPC В08В 9/023, publ. 07/27/2010), containing a rotor with cleaning tools fixed on levers mounted on axles with the ability to rotate around its axis, and clamping devices for pressing the cleaning tools to the surface of the pipeline, and the clamping devices are made in the form of rocker kinematic pairs with an elastic element, the levers are made two-armed, while the cleaning tool is fixed on one of their arms, and the other shoulder is pivotally connected to the clamping device.

The disadvantages of this working body are the complexity of the design due to the presence of a large number of small precisely mated parts, which leads to low reliability and low maintainability, especially in the field, a narrow scope due to the impossibility of processing pipe ends for welding, as well as the complexity of use in field conditions during the construction of pipelines due to the need to power the power drive and a non-universal cleaning tool for stripping insulation.

Also known is a device for cleaning the outer surface of the end sections of pipes (Patent RU No. 2522346, IPC В08В 9/023, publ. 10.07.2014), containing a cleaning tool made with the possibility of rotation and connected to a lever, and the cleaning tool is made in the form a straight prism or a cylinder with a side hole large enough to secure the outer insulation during rotation, the lever is connected to the end of the cleaning tool, and the lever is equipped with at least one handle located at a distance from the axis of rotation sufficient to overcome the adhesion force of the insulation to the pipe ...

The disadvantages of this device are the low quality of cleaning the pipe surface from insulation due to its physical separation, and a narrow field of application due to the impossibility of processing pipe ends for welding.

The closest is a cutting tool (Patent RU No. 2522404, IPC В23В 29/00, 31/107, publ. 10.07.2014), including a holder and a cutting insert having a longitudinal axis, a cutting part at the front end of the cutting insert and an insert shank at the rear end of the cutting insert, the cutting part has a cutting tip that has at least one cutting edge, while the holder has a clamping part at the front end of the holder and a shank of the holder at the rear end of the holder, and the clamping part contains an o-ring, a cup and a clamping sleeve ...

The disadvantage of the known tool is a laborious design in terms of manufacturing a clamping sleeve with elements of a recess and an internal groove made in the form of a semicircle and for which specialized equipment and tools are required. Another disadvantage is the multi-piece design, which consists of a large number of small parts, and the presence of one cutting tool, which can contribute to a decrease in productivity when processing surfaces and more regular replacement of the cutting part.

The technical objectives are to create a simple, versatile and reliable design for removing finning on the surface of finned tubes, improving the quality of work on removing finning, expanding the range of processing the diameters of finned tube surfaces, as well as reducing material and labor costs.

Technical problems are solved by a device for removing finning on the surface of a finned tube, which includes a cutting part with a holder.

What is new is that the device additionally includes a main part, which contains a sleeve with a seat on one side with the possibility of installing a cutting part and an internal groove on the other side with the possibility of installing a threaded sleeve with a central hole, the sleeve has a central hole and is equipped with two through holes, located opposite each other from above and below the sleeve, the cutting part is made in the form of a cylindrical body with a central hole and technological pockets, holders tightened with bolts with brazed plates are installed in the technological pockets, while the holders are equipped with through grooves with the ability to move the holders within the through grooves, a centering pin is inserted into the central hole of the threaded sleeve, which is a hollow cylinder with radii at the end, a transitional threaded section with a limiting shoulder and a tapered shank, with the possibility of placing the end part of the centering pin in the central hole of the cutting part, and the transition threaded section in the threaded bushing.

FIG. 1 shows the main view of a device for removing finning on the surface of a finned tube.

FIG. 2 shows a side view of the device.

A device for removing ribbing on the surface of a finned tube (not shown in Figs. 1, 2) includes a cutting part, additionally includes a main part. The main part of the device contains a bushing 1 (Fig. 1) with a seat 2 on one side for rigid installation (for example, welding) of the cutting part and an internal recess 3 on the other side with the possibility of installation in an internal recess 3 of the bushing 1 of the threaded bushing 4 (for example, by welding) with a central hole. The cutting part is installed on the seat 2 of the main part, both parts are welded together.

The bushing 1 of the main part has a central hole, it is equipped with two through holes 5 and 6, located opposite each other at the top and bottom of the bushing 1. The through holes 5 and 6 are intended for the exit of chips during the processing of the finned surface, thereby increasing the quality of work. The internal undercut 3 allows you to rigidly fix the threaded bushing 4, limiting its movement and movement, thereby allowing the entire structure of the device to be rigidly fixed.

The cutting part of the device is made in the form of a cylindrical body 7 with a central hole 8 and technological pockets 9 (Fig. 2). The central hole 8 (Fig. 1) of the cutting part coincides with the central hole of the sleeve 1. In the technological pockets 9 (Fig. 2) holders 10 are installed, which are tightened by bolts 11 (4 pcs.), With brazed plates 12. The cutting part is made with two technological pockets 9, in which two holders 10 are installed. Each holder 10 has one brazed plate 12. In this case, the holders 10 are equipped with through grooves 13 with the possibility of moving the holders 10 within the through grooves 13. Thus, in the body (body) of each from the holders 10 there are two through grooves 13 through which two bolts 11 are threaded. The bolts 11, threaded through the holders 10, are inserted into the holes of the technological pockets 9 of the housing 7 (Fig. 1) of the cutting part, tightened, fixed. By loosening the bolts 11 (Fig. 2), it becomes possible to move the holder 10 within the through grooves 13 to the required distance, thereby adjusting the distance to the required size of the pipe being processed. Then, tightening the bolts 11, fix the position of the holders 10. The range of machining of the diameters of the finned pipe surfaces is expanded.

A centering pin 14 is inserted (for example, screwed in) into the central hole of the threaded bushing 4 (Fig. 1), which is a hollow cylinder with radii at the end (not shown in Figs. 1, 2), with a transitional threaded section 15 with a limiting shoulder 16 and a tapered shank 17, with the possibility of placing the end part of the centering pin 14 in the central hole 8 of the cutting part, and the transitional threaded section 15 in the threaded sleeve 4. The end part of the centering pin 14 with radii provides a smooth entry of the finned pipe of the required diameter, and the limiting shoulder 16 of the centering pin 14 securely fixes it in the threaded bush 4. Thus, the centering pin 14 is screwed into the threaded bush 4 up to the limit shoulder 16.

The proposed device for removing finning on the surface of a finned tube is made of steel and is assembled by a permanent connection (for example, by welding along the contour).

A device for removing finning on the surface of a finned tube works as follows.

To remove the ribbing on the surface of the finned tube, the device is installed in the spindle of the trimming machine (not shown in Figs. 1, 2). The finned pipe is fixed on the rack opposite the trimming equipment, subject to the condition that the center of the product axis and the center of the spindle axis of the device installed in it coincide. The bolts 11 (Fig. 2), with which the holders 10 with the brazed plates 12 were tightened, are loosened with a wrench, and their tightening is gradually weakened. The holders 10 move along the technological pockets 9 within the through grooves 13, their position with the brazed plates 12 is adjusted to set the required processing size. After that, the bolts 11 are tightened to the stop.

On the trimming machine, the spindle turns are turned on, rotation is transmitted to the device through the tapered shank 17 (Fig. 1) of the centering pin 14 and the threaded sleeve 4, and the spindle feed is turned on. The spindle, together with the device, moves to the end of the finned heat exchanger tube. Holders 10 (Fig. 2) with brazed plates 12, installed in technological pockets 9, remove the ribbed surface on the outer surface of the pipe. At the end of the operation, the spindle with the device returns to its original position.

The device can be used with most trimming equipment due to the presence of a standard seat (made in the form of a cone, tapered shank, morse number 3) and compact dimensions, is universal and at the same time easy to manufacture. For the manufacture of the device does not require large material and labor costs due to the simple design and the absence of complex assembly units. This device allows you to use unclaimed existing equipment, eliminate the need to purchase expensive equipment.

The proposed device for removing finning on the surface of a finned pipe allows to improve the quality of work on removing the finning, expands the range of processing the diameters of the finned pipe surfaces, and also reduces material and labor costs.

Claims (1)

A device for removing ribbing on the surface of a finned tube, including a cutting part with a holder, characterized in that the device additionally includes a main part, which contains a sleeve with a seat on one side, with the possibility of installing the cutting part and an internal groove on the other side, with the possibility of installation a threaded sleeve with a central hole, and the sleeve has a central hole and is equipped with two through holes located opposite each other, above and below the sleeve, while the cutting part is made in the form of a cylindrical body with a central hole and technological pockets, holders are installed in the technological pockets, tightened with bolts, with brazed plates, while the holders are equipped with through grooves, with the ability to move the holders within the through grooves, and a centering pin is inserted into the central hole of the threaded sleeve, which is a hollow cylinder with radii at the end and transitional threaded a section with a limiting step, as well as with a tapered shank, with the possibility of placing the end part of the centering pin in the central hole of the cutting part, and the transition threaded section in the threaded sleeve.

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