Cylindrical cutter

Abstract

The utility model discloses a cylindrical cutter which comprises a cylindrical material digging cutter, one end of the material digging cutter is sealed, cutter teeth are arranged at the other end of the material digging cutter, a hollow cutter handle is fixed at the sealed end of the material digging cutter along the length direction of the material digging cutter, the axis of the cutter handle coincides with that of the cylindrical cutter, and an inner cavity of the cutter handle is communicated with an inner cavity of the material digging cutter; a plug fixed with a radial drilling machine is arranged at one end, far away from the digging cutter, of the cutter handle, a gas collecting sleeve is sleeved on the cutter handle in a sealing manner, the gas collecting sleeve is rotatably connected with the cutter handle, an inserting nozzle is arranged on the gas collecting sleeve, and a plurality of vent holes are annularly formed in the cutter handle part sleeved with the gas collecting sleeve. According to the utility model, the air collecting sleeve is arranged on the knife handle in a sealing manner, air pressure is formed in the material digging knife and air flow is formed between the material digging knife and the graphite core by adopting a form of blowing air into the air collecting sleeve when the material digging knife is used, so that the gathering of graphite powder is avoided, the blockage of the graphite powder in the knife teeth is also avoided, and the cutting efficiency is improved; and the temperature rise of the cylinder cutter is avoided, so that the problem that the service life of the cylinder cutter is shortened due to temperature rise is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of graphite cutting tools, in particular to a tube knife. Background Art

[0002] Graphite parts, such as graphite insulation tubes, cylindrical graphite heaters, etc., are increasingly widely used in industrial production. The production process of cylindrical graphite heaters in vacuum high-temperature furnaces such as CZ single crystal furnaces and semiconductors in China is mostly as follows: first prepare a thick graphite plate, then use a cylindrical knife to rotate and cut on the thick graphite plate to obtain two blanks, one is a hollow graphite plate blank, and the other is a cylindrical graphite core, and then use a cylindrical knife with a slightly larger or smaller diameter to continue concentrically cutting on the graphite plate blank or graphite core again to obtain a graphite tube, and then use a tool to cut the graphite tube, similar to hollowing out the wall of the graphite tube, and cut or carve out the tortuous shape of the graphite heater bit by bit. After the cutting is completed, the cylindrical graphite heater obtained is a complete, non-separated one-piece piece.

[0003] The current tube knife structure is as follows Figure 1 As shown, it includes a cylindrical punching tool and a tool handle fixed to the punching tool. A blade is provided on the side of the punching tool away from the tool handle. When in use, the tool handle is fixed on a radial drilling machine. The drilling machine is started to drive the tool handle and the punching tool to rotate at high speed, and the blade cuts the graphite plate and cuts on the graphite plate.

[0004] The problems with the above-mentioned tube knife are: on the one hand, when the tube knife is cutting, the inner wall of the tube knife fits tightly against the graphite core, and the graphite powder after cutting exists between the graphite core and the inner wall of the tube knife, resulting in a faster cutting speed of the tube knife in the initial stage of cutting (i.e., the speed of penetrating into the graphite plate). As the cutting progresses, more and more graphite powder exists between the inner wall of the tube knife and the graphite core, resulting in a slower and slower cutting speed; on the other hand, the cutting efficiency is reduced due to the filling of graphite powder between the teeth of the tube knife during cutting; on the third hand, as the cutting progresses, the temperature of the tube knife becomes higher and higher, which will affect the service life of the tube knife; on the fourth hand, after the tube knife cuts, the graphite core and the tube knife are filled with graphite powder, the friction is large, and it is difficult to remove the graphite core. Utility Model Content

[0005] The utility model provides a tube knife to solve the above technical problems.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a cylindrical knife, comprising a cylindrical material-cutting knife, one end of the material-cutting knife is sealed, and the other end is provided with knife teeth, a hollow knife handle is fixed along the length direction of the sealed end of the material-cutting knife, the knife handle coincides with the axis of the cylindrical knife, and the inner cavity of the knife handle is connected with the inner cavity of the material-cutting knife;

[0007] A plug fixed to the radial drilling machine is provided at the end of the tool handle away from the digging knife, an air collecting sleeve is provided on the tool handle as a sealing sleeve, the air collecting sleeve is rotatably connected to the tool handle, a nozzle is provided on the air collecting sleeve, and a plurality of air holes are circumferentially provided on the tool handle portion provided with the air collecting sleeve.

[0008] Preferably, two bearings are provided on the shank, and the air collecting sleeves are sleeved on the outer sides of the two bearings.

[0009] To ensure the sealing effect between the air collecting sleeve and the tool handle, a sealing groove can be opened on the inner ring of the air collecting sleeve, and an O-ring can be buckled in the sealing groove. The O-ring sleeve is set on the tool handle to achieve the sealing between the air collecting sleeve and the tool handle; sealing can also be achieved by setting a sealing structure between the air collecting sleeve and the inner ring of the bearing.

[0010] The utility model has the following beneficial effects:

[0011] In the utility model, the knife handle is arranged in a hollow form and is connected with the digging knife. An air collecting sleeve is arranged to seal the knife handle. When in use, air is blown into the air collecting sleeve to form air pressure in the digging knife, and air flow is formed between the digging knife and the graphite core, thereby avoiding the aggregation of graphite powder and the blockage of graphite powder in the blade teeth, thereby improving the cutting efficiency; and also avoiding the increase of the temperature of the tube knife, thereby avoiding the problem of reduced service life of the tube knife due to the increase of temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a traditional tube knife form;

[0013] Figure 2 This is a schematic diagram of a tube knife in this embodiment;

[0014] Figure 3 for Figure 2 An enlarged schematic diagram of point A.

[0015] Legend: Digging knife 1, knife teeth 2, knife handle 3, plug 4, air collecting sleeve 5, nozzle 6, vent hole 7, bearing 8. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] Reference Figure 2 and Figure 3A cylindrical knife, comprising a cylindrical material-cutting knife 1, one end of the material-cutting knife 1 is sealed, and the other end is provided with a knife tooth 2, a hollow knife handle 3 is fixed along the length direction of the sealed end of the material-cutting knife 1, the knife handle 3 coincides with the axis of the cylindrical knife, and the inner cavity of the knife handle 3 is connected with the inner cavity of the material-cutting knife 1;

[0018] A plug 4 fixed to the radial drilling machine is provided at the end of the tool handle 3 away from the digging knife 1, an air collecting sleeve 5 is provided as a sealing sleeve on the tool handle 3, the air collecting sleeve 5 is rotatably connected to the tool handle 3, a nozzle 6 is provided on the air collecting sleeve 5, a plurality of air holes 7 are circumferentially provided on the part of the tool handle 3 provided with the air collecting sleeve 5, two bearings 8 are provided on the tool handle 3, and the air collecting sleeve 5 is sleeved on the outer sides of the two bearings 8.

[0019] Working principle: When in use, the plug 4 of the tool handle 3 is inserted into the chuck of the radial drilling machine to fix the tool handle 3 on the radial drilling machine, the air pipe is inserted into the nozzle 6, the valve on the air pipe is opened, and the drilling machine is started to drive the tool handle 3 and the punching knife 1 to rotate at high speed, and the blade cuts the graphite plate. At the same time, air is blown into the air collecting sleeve 5 to form air pressure in the punching knife 1, and airflow is formed between the punching knife 1 and the graphite core, which avoids the aggregation of graphite powder and the blockage of graphite powder in the teeth 2, thereby improving the cutting efficiency; it also avoids the increase of the temperature of the barrel knife, thereby avoiding the problem of reduced service life of the barrel knife due to temperature increase.

[0020] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cylindrical knife, characterized in that: It comprises a cylindrical material-cutting knife, one end of which is sealed and the other end is provided with blade teeth, a hollow knife handle is fixed along the length direction of the sealed end of the material-cutting knife, the knife handle coincides with the axis of the cylindrical knife, and the inner cavity of the knife handle is connected with the inner cavity of the material-cutting knife; A plug fixed to the radial drilling machine is provided at the end of the tool handle away from the digging knife, an air collecting sleeve is provided on the tool handle as a sealing sleeve, the air collecting sleeve is rotatably connected to the tool handle, a nozzle is provided on the air collecting sleeve, and a plurality of air holes are circumferentially provided on the tool handle portion provided with the air collecting sleeve.

2. A cylindrical knife according to claim 1, characterized in that: Two bearings are arranged on the knife handle, and the air collecting sleeves are sleeved on the outer sides of the two bearings.

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