Scraping head tool

Abstract

The utility model discloses a head scraping tool which comprises a row, an outer positioning ring is arranged on the outer side of the row, a thrust ball bearing and a bearing cover are arranged between the outer positioning ring and the row, a fixing nut is sleeved outside the part, arranged in the outer positioning ring, of the row, and the fixing nut is fixedly connected with the row and rotationally connected with the thrust ball bearing. A scraper blade is arranged at the end of the row, an inner positioning ring matched with the tube plate and the inner wall of the heat exchange tube is sleeved outside the end of the row, and a scraper head is arranged on the scraper blade and located on the outer side of the end face of the row and the inner positioning ring. After the knife row is assembled, the Morse knife handle is connected with the handheld pipe scraping machine, and an operator performs head scraping operation. The outer positioning ring of the scraping head tool does not rotate and is in a static state when the cutter row rotates at a high speed, the outer end of the tube plate can be effectively protected, an operator can hold the outer positioning ring conveniently, the cutter is replaceable, the scraping blade can be replaced independently, the structure is simple, the working efficiency of the single scraping head tool is improved, and the use cost of the single scraping head tool is reduced.

Description

Technical Field

[0001] This utility model relates to a scraping tool, specifically to the scraping work after the heat exchange tubes of a water-cooled condenser in a thermal power or nuclear power unit have expanded. Background Technology

[0002] In the manufacturing process of water-cooled condensers, heat exchange tubes are the main component responsible for heat exchange. After the tubes are installed, they undergo expansion. The excess portion extending beyond the tube sheet must be cut off, typically using a scraper. However, this scraping process can easily damage the tube sheet surface, and since a large number of scrapers are usually used, the tools wear out quickly. Therefore, designing a new scraping tool would improve work efficiency, ease of operation, and reduce operating costs. Summary of the Invention

[0003] The present invention aims to solve the problem of how to prevent damage to the excess portion of the heat exchange tubes that protrudes from the tube sheet during the scraping process after the tubes have expanded.

[0004] To address the aforementioned technical problems, this utility model provides a scraping tool, comprising a strip, an outer positioning ring on the outer side of the strip, a thrust ball bearing and a bearing cap between the outer positioning ring and the strip, a fixing nut fitted around the portion of the strip inside the outer positioning ring, the fixing nut being fixedly connected to the strip and rotatably connected to the thrust ball bearing; a scraper blade is provided at the end of the strip, and an inner positioning ring is fitted around this end to mate with the inner wall of the tube sheet and heat exchange tubes, the scraper blade having a scraper head located outside the end face of the strip and the inner positioning ring. After assembly, the strip is connected to a handheld tube scraper via a Morse cutter handle, allowing the operator to perform the scraping operation.

[0005] Preferably, the end of the row is provided with a slot for inserting a scraper blade.

[0006] Preferably, the outer side of the drain is provided with an external thread for threaded connection with a fixing nut, and the direction of tightening the fixing nut is the same as the rotation direction of the drain to prevent the drain from loosening.

[0007] Preferably, the outer positioning ring has a hollow structure to facilitate chip removal.

[0008] Preferably, the inner positioning ring is made of bakelite, which can effectively protect the inner diameter of the heat exchange tube.

[0009] The outer positioning ring of this scraper tool remains stationary when the blade plate rotates at high speed, effectively protecting the outer end of the tube sheet and making it easy for operators to hold. The hollow design in the middle facilitates chip removal. The inner positioning ring is made of bakelite, which effectively protects the inner diameter of the heat exchange tube. The blades are replaceable, and the scraper blades can be replaced individually. The simple structure improves the working efficiency and operating cost of a single scraper tool. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the scraper tool.

[0011] Figure 2 This is a schematic diagram of the outer positioning ring;

[0012] Figure 3 for Figure 2 A cross-sectional view of the AA plane;

[0013] Figure 4 A schematic diagram of the arrangement;

[0014] Figure 5 This is the front view of the scraper blade;

[0015] Figure 6 for Figure 5 Side view. Detailed Implementation

[0016] To make this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0017] Example

[0018] like Figure 1-6 As shown, this utility model provides a scraping tool, which includes a row 6. An outer positioning ring 4 is provided on the outer side of the row 6. A thrust ball bearing 5 and a bearing cover 7 are provided between the outer positioning ring 4 and the row 6. A fixing nut 8 is sleeved on the part of the row 6 located inside the outer positioning ring 4. The fixing nut 8 is fixedly connected to the row 6 and rotatably connected to the thrust ball bearing 5. A scraper blade 3 is provided at the end of the row 6. An inner positioning ring 2 is sleeved on the end of the row 6 to cooperate with the inner wall of the tube sheet and heat exchange tube 9. A slot for inserting the scraper blade 3 is provided at the end of the row 6. A scraper head 1 is provided on the scraper blade 3. The scraper head 1 is located on the outer side of the end face of the row 6 and the inner positioning ring 2.

[0019] The outer side of row 6 is provided with external threads for threaded connection with fixing nut 8, and the direction of tightening with fixing nut 8 is the same as the rotation direction of row 6.

[0020] The outer positioning ring 4 has a hollow structure, such as Figure 3 As shown, the three hollow structures are evenly distributed on the cross-section.

[0021] The inner positioning ring 2 is made of bakelite.

[0022] The installation steps for the above-mentioned scraper tool are as follows:

[0023] (1) First, install the outer positioning ring, thrust ball bearing, and bearing cover into one piece;

[0024] (2) Tighten the fixing nuts into the row according to the positions shown in the drawing;

[0025] (3) Install the scraper blade, inner positioning ring, screw and washer into the drain respectively. Adjust the installation position according to the size of the heat exchange tube protrusion of the product. After tightening the screw, it can be inserted into the groove of the scraper blade to prevent it from being radially displaced.

[0026] (4) Finally, install the outer positioning ring assembly assembled in step (1), and after adjusting the installation position, fix it on the row with set screws;

[0027] (5) Load the handheld scraper and have the operator start scraping the head.

[0028] The outer positioning ring of this scraper tool does not rotate when the nozzle is rotating at high speed, that is, it is stationary.

Claims

1. A shaving tool, characterized in that, The assembly includes a row (6), an outer positioning ring (4) on the outside of the row (6), a thrust ball bearing (5) and a bearing cover (7) between the outer positioning ring (4) and the row (6), a fixing nut (8) on the outside of the part of the row (6) located inside the outer positioning ring (4), the fixing nut (8) is fixedly connected to the row (6) and rotatably connected to the thrust ball bearing (5); a scraper blade (3) is provided at the end of the row (6), and an inner positioning ring (2) is provided on the end of the row (6) to cooperate with the inner wall of the tube sheet and the heat exchange tube (9). A scraper head (1) is provided on the scraper blade (3), and the scraper head (1) is located on the outside of the end face of the row (6) and the inner positioning ring (2).

2. The shaving tool as described in claim 1, characterized in that, The end of the row (6) is provided with a slot for inserting a scraper blade (3).

3. The shaving tool as described in claim 1, characterized in that, The outer side of the row (6) is provided with an external thread for threaded connection with the fixing nut (8), and the direction of tightening with the fixing nut (8) is the same as the rotation direction of the row (6).

4. The shaving tool as described in claim 1, characterized in that, The outer positioning ring (4) has a hollow structure.

5. The shaving tool as described in claim 1, characterized in that, The inner positioning ring (2) is made of bakelite.

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