Wire cutting machine tool guide wheel shaft core on electric mechanism

Abstract

The utility model discloses a kind of wire cutting machine tool guide wheel axle core power-on mechanism, including guide wheel, guide wheel axle, ceramic bearing, power-on assembly, sleeve and plug, the guide wheel is fixed in the one end of the guide wheel axle, the power-on assembly and ceramic bearing are set on the guide wheel axle, the sleeve is set on the outside of the guide wheel axle, the plug is fixed on the sleeve.The utility model's wire cutting machine tool guide wheel axle power-on mechanism is rotated by the connection between outer spacer sleeve and inner spacer sleeve, and liquid metal is set between inner spacer sleeve and outer spacer sleeve, realizes the stable power-on of electrode wire continuously, to avoid the electrode wire wear and tear and power-on unstable problem existing when power-on of conductive block, and also avoid the carbon brush easy wear and tear when carbon brush power-on, and the problem of unstable power-on caused by carbon brush residual film accumulation;On the other hand, by the threaded hole on outer spacer sleeve, liquid metal can also be quickly replenished.

Description

Technical Field

[0001] This utility model relates to the field of wire EDM machine technology, and in particular to an electric power supply mechanism for the guide wheel shaft core of a wire EDM machine. Background Technology

[0002] Most wire EDM machines on the market use conductive blocks for power supply. These conductive blocks are generally made of cemented carbide and have a hard contact with the electrode wire used for cutting. After prolonged processing, the electrode wire can cut deep grooves into the conductive blocks, which can easily lead to wire breakage if not adjusted in time. Moreover, this power supply method causes significant wear and tear on the electrode wire. On the other hand, for some materials that are easily oxidized and whose oxides have poor conductivity and high hardness (such as aluminum), the stability of the power supply is easily affected.

[0003] To address the aforementioned shortcomings, some manufacturers employ guide wheels for power supply. This method uses carbon brushes mounted on the guide wheel to power the electrode wires. However, the connection between the carbon brushes and the guide wheel shaft is rigid. As the guide wheel rotates at high speed, the carbon brushes wear out quickly, leading to reduced efficiency after prolonged processing. Furthermore, the accumulation of carbon brush residue can cause unstable discharge.

[0004] In addition, there are also conductive paste and liquid metal that are used for power generation on the market. However, the guide wheel assembly with this structure is expensive, and this structure is disposable. It is difficult to replenish the conductive paste after the discharge is unstable. Even if the conductive paste is replenished, the power generation will still be unstable.

[0005] Therefore, there is an urgent need to provide a power-on mechanism with low wire loss and stable discharge to solve the problems existing in the prior art. Utility Model Content

[0006] The purpose of this invention is to provide a wire EDM machine tool guide wheel shaft power-on mechanism with low wire loss and stable discharge, so as to solve the shortcomings of existing technologies for powering conductive blocks, guide wheels (carbon brushes), conductive paste and liquid metal.

[0007] The technical solution adopted by this utility model to solve the technical problem is as follows:

[0008] A power-on mechanism for a wire EDM machine tool guide wheel shaft includes a guide wheel, a guide wheel shaft, a ceramic bearing, a power-on component, a sleeve, and a plug. The guide wheel is fixed to one end of the guide wheel shaft, the power-on component and the ceramic bearing are disposed on the guide wheel shaft, the sleeve is disposed on the outside of the guide wheel shaft, and the plug is fixed on the sleeve.

[0009] Furthermore, the guide wheel shaft has a stepped structure, including a first shaft, a second shaft, and a third shaft with successively smaller diameters; an external thread is formed on the third shaft of the guide wheel shaft, and a nut is connected to the external thread; the guide wheel is fixed to one end of the first shaft of the guide wheel shaft.

[0010] Furthermore, the ceramic bearing is disposed on the second shaft of the guide wheel shaft, and the inner ring of the ceramic bearing is in close contact with the first shaft of the guide wheel shaft.

[0011] Furthermore, the power-on assembly includes an inner spacer, an outer spacer, and a sealing gasket. The inner spacer is sleeved on the second shaft of the guide wheel shaft. One end of the inner spacer is in contact with the inner ring of the ceramic bearing, and the other end is in contact with the nut on the guide wheel shaft and is pressed by the nut.

[0012] The sealing gaskets are fitted at both ends of the inner spacer, and the two sealing gaskets are spaced apart; a flange is formed at the outer end of the sealing gasket; the sealing gaskets are limited by snap rings provided at both ends of the inner spacer.

[0013] The outer spacer is fitted onto the sealing gasket, and the annular protrusion formed on the inner wall of the outer spacer is engaged between the flanges of the two sealing gaskets. One end of the outer spacer is in contact with the outer ring of the ceramic bearing. The outer wall of the inner spacer, the inner wall of the outer spacer, and the sealing gaskets at both ends of the inner spacer together form a filling cavity. The outer spacer has a threaded hole communicating with the filling cavity, and a screw is threaded onto the threaded filling hole.

[0014] Furthermore, an annular groove is also formed on the annular protrusion.

[0015] Furthermore, the sleeve is fitted onto the guide wheel shaft, and the inner sidewall of the sleeve is in close contact with the outer ring of the ceramic bearing and the outer ring of the outer spacer; a stop portion is formed inward at the position corresponding to the first shaft of the guide wheel shaft, and an internal thread is formed on the inner wall of the end away from the guide wheel.

[0016] Furthermore, the plug is threaded to one end of the sleeve with an internal thread, and the open end of the plug is in close contact with the outer ring of the outer spacer.

[0017] Furthermore, the plug is formed as a cylindrical structure with an opening on one side. An external thread is formed on the outer surface of the plug, and a terminal is formed on its plane for connection to an external power supply wire. Preferably, a slotted groove is also formed on the plane of the plug.

[0018] The present invention has the following beneficial effects: The wire EDM machine tool guide wheel shaft power-on mechanism of the present invention achieves continuous and stable power-on of the electrode wire through the rotational connection between the outer and inner spacers and the liquid metal disposed between the inner and outer spacers, thereby avoiding the problems of electrode wire wear and unstable power-on when the conductive block is powered on, and also avoiding the problems of easy wear of carbon brushes and unstable power-on caused by carbon brush residue accumulation when the carbon brush is powered on; on the other hand, liquid metal can also be quickly replenished through the threaded hole on the outer spacer. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the power supply mechanism for the guide wheel shaft of the wire EDM machine tool according to this utility model;

[0020] Figure 2 This is a schematic diagram showing the fit between the ceramic bearing, the power supply assembly, and the guide wheel shaft in the power supply mechanism of the wire EDM machine tool guide wheel shaft of this utility model;

[0021] Figure 3 This is a cross-sectional view of the power supply mechanism for the guide wheel shaft of the wire EDM machine tool according to this utility model;

[0022] Figure 4 This is a cross-sectional view of the power supply mechanism of the guide wheel shaft of a wire EDM machine tool, according to another embodiment of the present invention.

[0023] The markings in the diagram are as follows: 1-guide wheel; 2-guide wheel shaft; 3-ceramic bearing; 4-sleeve; 5-plug; 6-nut; 7-inner spacer; 8-outer spacer; 9-sealing gasket; 10-circlip; 11-screw; 12-metal bearing; 13-insulating gasket. Detailed Implementation

[0024] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0025] Example 1

[0026] like Figure 1-3 As shown, a power-on mechanism for a wire EDM machine guide wheel shaft includes a guide wheel 1, a guide wheel shaft 2, a ceramic bearing 3, a power-on component, a sleeve 4, and a plug 5. The guide wheel 1 is fixed to one end of the guide wheel shaft 2. The power-on component and the ceramic bearing 3 are disposed on the guide wheel shaft 2. The sleeve 4 is disposed on the outside of the guide wheel shaft 2, and the plug 5 is fixed on the sleeve 4.

[0027] Specifically, the guide wheel shaft 2 has a stepped structure, including a first shaft, a second shaft, and a third shaft with successively smaller diameters; an external thread is formed on the third shaft of the guide wheel shaft 2, and a nut 6 is connected to the external thread; the guide wheel 1 is fixed to one end of the first shaft of the guide wheel shaft 2.

[0028] The ceramic bearing 3 is mounted on the second shaft of the guide wheel shaft 2, and the inner ring of the ceramic bearing 3 is in close contact with the first shaft of the guide wheel shaft 2.

[0029] Continue to refer to Figure 3 The power-on assembly includes an inner spacer 7, an outer spacer 8, and a sealing gasket 9. The inner spacer 7 is fitted onto the second shaft of the guide wheel shaft 2. One end of the inner spacer 7 is fitted with the inner ring of the ceramic bearing 3, and the other end is fitted with the nut 6 on the guide wheel shaft 2 and is pressed by the nut 6.

[0030] The sealing gasket 9 is sleeved on both ends of the inner spacer 7, and the two sealing gaskets 9 are spaced apart; a flange is formed on the outer end of the sealing gasket 9; the sealing gasket 9 is limited by the snap rings 10 provided at both ends of the inner spacer 7.

[0031] The outer spacer 8 is fitted onto the sealing gasket 9, and the annular protrusion formed on the inner wall of the outer spacer 8 is engaged between the flanges of the two sealing gaskets 9. One end of the outer spacer 8 is in contact with the outer ring of the ceramic bearing 3. The outer wall of the inner spacer 7, the inner wall of the outer spacer 8, and the sealing gaskets 9 set at both ends of the inner spacer 7 together form a filling cavity. The outer spacer 8 has a threaded hole communicating with the filling cavity, and a screw 11 is threadedly connected to the threaded filling hole.

[0032] In this embodiment, liquid metal can be filled into the filling cavity through the threaded hole, and after filling, it is sealed by screw 11. Preferably, an annular groove is also formed on the annular boss.

[0033] The sleeve 4 is sleeved on the guide wheel shaft 2, and the inner sidewall of the sleeve 4 is in close contact with the outer ring of the ceramic bearing 3 and the outer ring of the outer spacer 8; a stop portion is formed inward at the position corresponding to the first shaft of the guide wheel shaft 2, and an internal thread is formed on the inner wall of the end away from the guide wheel 1.

[0034] The plug 5 is threadedly connected to the internally threaded end of the sleeve 4, and the open end of the plug 5 is tightly fitted to the outer ring of the outer spacer 8. Specifically, the plug 5 is formed as a cylindrical structure with one open side, and an external thread is formed on its outer surface. A terminal is also formed on its plane for connecting to an external power supply wire. Preferably, a slotted groove is also formed on the plane of the plug.

[0035] In this embodiment, when the plug 5 is connected to the sleeve 4, its open end is pressed against the outer spacer. Since the other end of the outer spacer 8 is in contact with the outer ring of the ceramic bearing 3, the outer spacer 8 can be fixed by tightening the plug 5.

[0036] With the above configuration, the guide wheel and guide wheel shaft rotate under the drive of the electrode wire, thereby driving the inner spacer on the guide wheel shaft to rotate. The outer spacer, however, does not rotate under the pressure of the plug, thus achieving a rotational connection between the inner and outer spacers. The external power supply wire connects to the guide post on the plug, which in turn connects to the outer spacer. The outer spacer is connected to the inner spacer via liquid metal, and the inner spacer is connected to the guide wheel shaft. Thus, external power is transmitted to the guide wheel shaft and finally to the electrode wire through the guide wheel, achieving continuous power supply.

[0037] The wire EDM machine tool guide wheel shaft power-on mechanism of this invention achieves continuous and stable power-on of the electrode wire through the rotational connection between the outer and inner spacers and the liquid metal disposed between the inner and outer spacers. This avoids the problems of electrode wire wear and unstable power-on that exist when the conductive block is powered on, and also avoids the problems of easy wear of carbon brushes and unstable power-on caused by carbon brush residue accumulation when the carbon brush is powered on. On the other hand, liquid metal can also be quickly replenished through the threaded hole on the outer spacer.

[0038] Example 2

[0039] like Figure 4 As shown, the difference from Embodiment 1 is that the bearing used in this embodiment is a metal bearing 12, and an insulating gasket 13 is provided between the inner spacer, the outer spacer and the metal bearing, thereby preventing external power supply from being transmitted to the guide wheel shaft through the metal bearing, and thus preventing corrosion of the metal bearing caused by discharge.

[0040] The above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solutions of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A power-on mechanism for the guide wheel shaft core of a wire EDM machine, characterized in that, It includes a guide wheel, a guide wheel shaft, a ceramic bearing, a power supply assembly, a sleeve, and a plug. The guide wheel is fixed to one end of the guide wheel shaft. The power supply assembly and the ceramic bearing are disposed on the guide wheel shaft. The sleeve is disposed on the outside of the guide wheel shaft, and the plug is fixed on the sleeve.

2. The power-on mechanism for the guide wheel shaft of the wire EDM machine tool according to claim 1, characterized in that, The guide wheel shaft has a stepped structure, including a first shaft, a second shaft, and a third shaft with successively smaller diameters; an external thread is formed on the third shaft of the guide wheel shaft, and a nut is connected to the external thread; the guide wheel is fixed to one end of the first shaft of the guide wheel shaft.

3. The power-on mechanism for the guide wheel shaft of the wire EDM machine tool according to claim 2, characterized in that, The ceramic bearing is mounted on the second shaft of the guide wheel shaft, and the inner ring of the ceramic bearing is in close contact with the first shaft of the guide wheel shaft.

4. The power-on mechanism for the guide wheel shaft of the wire EDM machine tool according to claim 3, characterized in that, The power-on assembly includes an inner spacer, an outer spacer, and a sealing gasket. The inner spacer is fitted onto the second shaft of the guide wheel shaft. One end of the inner spacer is in contact with the inner ring of the ceramic bearing, and the other end is in contact with the nut on the guide wheel shaft and is tightened by the nut. The sealing gaskets are fitted at both ends of the inner spacer, and the two sealing gaskets are spaced apart; a flange is formed at the outer end of the sealing gasket; the sealing gaskets are limited by snap rings provided at both ends of the inner spacer. The outer spacer is fitted onto the sealing gasket, and the annular protrusion formed on the inner wall of the outer spacer is engaged between the flanges of the two sealing gaskets. One end of the outer spacer is in contact with the outer ring of the ceramic bearing. The outer wall of the inner spacer, the inner wall of the outer spacer, and the sealing gaskets at both ends of the inner spacer together form a filling cavity. The outer spacer has a threaded hole communicating with the filling cavity, and a screw is threaded onto the threaded filling hole.

5. The power-on mechanism for the guide wheel shaft of the wire EDM machine tool according to claim 4, characterized in that, An annular groove is also formed on the annular protrusion.

6. The power-on mechanism for the guide wheel shaft of the wire EDM machine tool according to claim 4, characterized in that, The sleeve is fitted onto the guide wheel shaft, and the inner sidewall of the sleeve is in close contact with the outer ring of the ceramic bearing and the outer ring of the outer spacer; a stop portion is formed inward at the position corresponding to the first shaft of the guide wheel shaft, and an internal thread is formed on the inner wall of the end away from the guide wheel.

7. The power-on mechanism for the guide wheel shaft of the wire EDM machine tool according to claim 6, characterized in that, The plug is threaded to one end of the sleeve with an internal thread, and the open end of the plug is in close contact with the outer ring of the outer spacer.

8. The power-on mechanism for the guide wheel shaft of the wire EDM machine tool according to claim 7, characterized in that, The plug is formed as a cylindrical structure with an opening on one side. An external thread is formed on the outer surface of the plug, and a terminal is formed on its plane. The terminal is used to connect to an external power supply wire.

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