Main shaft inner positioning device

Abstract

The utility model provides a positioning device in a main shaft, and belongs to the technical field of machinery. The chuck solves the problem that an existing chuck is poor in clamping stability of long shaft parts. The positioning device in the main shaft comprises a chuck main body with a through hole in the center and a tubular pull tube fixed in the through hole of the chuck main body, and further comprises a barrel-shaped positioning piece, and the closed end of the positioning piece is arranged in the pull tube in a penetrating mode. A plurality of sealing rings are fixed to the outer side of the closed end of the positioning piece, the outer sides of the sealing rings tightly abut against the inner wall of the pull pipe, the open end of the positioning piece stretches out of the pull pipe and is fixed to the chuck body, the inner end face of the closed end of the positioning piece is a plane, a filling pipe and a lining pipe which are both in a circular pipe shape are arranged in the positioning piece in a penetrating mode, and the lining pipe is made of metal materials. The filling pipe and the liner pipe are coaxially arranged and distributed in the axial direction of the positioning piece, and the filling pipe and the liner pipe are both in close fit with the positioning piece. The main shaft inner positioning device has the advantage of being good in clamping stability.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a spindle inner positioning device. Background Art

[0002] In the field of machining, machine tools are required to perform machining such as turning on various parts with different shapes and specifications. For different parts, different fixtures are often required for clamping. Among them, when machining shaft parts, the commonly used fixtures for clamping shaft workpieces on machine tools are three-jaw chucks and four-jaw chucks.

[0003] However, for parts with a relatively long axial length, relying solely on three-jaw chucks and four-jaw chucks for point-position clamping is prone to unstable clamping:

[0004] If the middle position of a long shaft part is clamped, the length of the machining end of the part extending out of the front end of the chuck is relatively long. Then, when machining the machining end of the long shaft part, it is easy to have chatter due to too long overhang, affecting the machining efficiency and quality; if the length of the machining end of the long shaft part extending out of the front end of the chuck is small, most of the long shaft part is inserted into the spindle inside the chuck. Due to the lack of support for the parts inside the spindle, they will sag under the influence of gravity, which will also affect the machining accuracy. Summary of the Utility Model

[0005] The purpose of the utility model is to address the above problems existing in the prior art and propose a spindle inner positioning device, which solves the problem of poor clamping stability of the existing chuck for long shaft parts.

[0006] The purpose of the utility model can be achieved by the following technical solutions:

[0007] A spindle inner positioning device includes a chuck body with a through hole in the center and a round-tube-shaped draw tube fixed in the through hole of the chuck body. It is characterized in that the spindle inner positioning device further includes a round-barrel-shaped positioning member. The closed end of the positioning member passes through the draw tube. Several sealing rings are fixed on the outer side of the closed end of the positioning member, and the outer side of the sealing rings is in close contact with the inner wall of the draw tube. The open end of the positioning member extends out of the draw tube and is fixed to the chuck body. The inner end face of the closed end of the positioning member is a plane. A filling tube and a lining tube, both of which are round-tube-shaped, are inserted into the positioning member. The lining tube is made of metal material. The filling tube and the lining tube are coaxially arranged and distributed along the axial direction of the positioning member. The filling tube and the lining tube are both in interference fit with the positioning member.

[0008] When this in-spindle positioning device is in use, a long-axis part is passed through the through-hole at the center of the chuck body and extends into the positioning member. The chuck body clamps the long-axis part near the end to be machined for machining. The other parts of the long-axis part are all inserted into the positioning member. The radial position of the long-axis part is supported and limited by a lining tube made of metal material, and the filling tube can fill the gap between the long-axis part and the positioning member, assisting in support while avoiding or reducing the entry of iron filings. When this in-spindle positioning device clamps the long-axis part, one end of the long-axis part is positioned by the chuck body, and the other end is positioned by the positioning member in cooperation with the filling tube and the lining tube, enabling the long-axis part to achieve at least two-point positioning during clamping, with good clamping stability. In this in-spindle positioning device, the chuck body and the draw tube are prior arts. After the positioning member is inserted into the draw tube, the closed end is radially limited with the draw tube through a sealing ring, and the open end is directly fixed to the chuck body, ensuring the stability of the connection of the positioning member, and further ensuring the stability of the positioning of the long-axis part inserted into the positioning member.

[0009] In the above-mentioned in-spindle positioning device, the number of the lining tubes is two, and they are respectively arranged near both ends of the positioning member. The inner diameter of the lining tube is smaller than the inner diameter of the filling tube. The smaller inner diameter of the lining tube can abut against the outer side surface of the long-axis part prior to the filling tube, realizing the limited support and positioning of the long-axis part, and the two lining tubes support separately, enabling a better support effect.

[0010] In the above-mentioned in-spindle positioning device, one end inner wall of the lining tube facing the open end of the positioning member has a conical surface, and the diameter of this conical surface gradually increases from the closed end of the positioning member to the open end. The setting of the conical surface facilitates the insertion of the long-axis part and avoids jamming.

[0011] In the above-mentioned in-spindle positioning device, an air outlet hole is opened on the closed end of the positioning member. One end of the air outlet hole is located at an eccentric position inside the inner end of the closed end of the positioning member, and the other end of the air outlet hole is located at the center of the outer end of the closed end. The in-spindle positioning device further includes an air outlet pipe inserted into the air outlet hole. The air outlet pipe can be externally connected to a gas source to inflate the positioning member to maintain a positive pressure state inside the positioning member and avoid the entry of iron filings generated during machining into the positioning member.

[0012] Compared with the prior art, when this in-spindle positioning device clamps the long-axis part, one end of the long-axis part is positioned by the chuck body, and the other end is positioned by the positioning member in cooperation with the filling tube and the lining tube, enabling the long-axis part to achieve at least two-point positioning during clamping, with good clamping stability. Brief Description of the Drawings

[0013] Figure 1 It is a schematic cross-sectional structure diagram when this in-spindle positioning device clamps a part.

[0014] In the figure, 1 is the chuck body; 2 is the draw tube; 3 is the positioning member; 31 is the air vent; 4 is the sealing ring; 5 is the filling tube; 6 is the liner tube; 61 is the conical surface; 7 is the air outlet pipe; 8 is the long shaft-like part. Detailed implementation mode

[0015] The following are specific embodiments of the present invention and in combination with the attached drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0016] As Figure 1 shown, the in-spindle positioning device of the present invention includes a chuck body 1 with a through hole in the center and a round-tubular draw tube 2 fixed in the through hole of the chuck body 1.

[0017] The in-spindle positioning device further includes a round-barrel-shaped positioning member 3. The closed end of the positioning member 3 is inserted into the draw tube 2. Two sealing rings 4 are fixed on the outer side of the closed end of the positioning member 3, and the outer side of the sealing ring 4 is in close contact with the inner wall of the draw tube 2. The open end of the positioning member 3 extends out of the draw tube 2 and has a flanging turned outwards. The open end of the positioning member 3 is fixed to the chuck body 1 by a screw passing through the flanging. The inner end face of the closed end of the positioning member 3 is a plane.

[0018] A filling tube 5 and a liner tube 6, both of which are round-tubular, are inserted into the positioning member 3. The number of filling tubes 5 is several and they are all made of nylon material. The number of liner tubes 6 is two and they are all made of metal material. The several filling tubes 5 and the liner tubes 6 are coaxially arranged and distributed along the axial direction of the positioning member 3. The filling tubes 5 and the liner tubes 6 are both in interference fit with the positioning member 3. In this embodiment, the two liner tubes 6 are respectively arranged near both ends of the positioning member 3. The inner diameter of the liner tube 6 is smaller than the inner diameter of the filling tube 5. The inner walls of one ends of the two liner tubes 6 facing the open end of the positioning member 3 both have conical surfaces 61, and the diameter of the conical surface 61 gradually increases from the closed end of the positioning member 3 to the open end.

[0019] An air vent 31 is opened on the closed end of the positioning member 3. One end of the air vent 31 is located at an eccentric position inside the inner end of the closed end of the positioning member 3, and the other end of the air vent 31 is located at the center of the outer end of the closed end. The in-spindle positioning device further includes an air outlet pipe 7 inserted into the air vent 31.

[0020] When the in-spindle positioning device of the present invention is in use, the long shaft-like part 8 is passed through the through hole in the center of the chuck body 1 and extends into the positioning member 3. The chuck body 1 clamps the long shaft-like part 8 at a position near the end to be processed for processing. The other parts of the long shaft-like part 8 are all inserted into the positioning member 3 until the end of the long shaft-like part 8 abuts against the inner end face of the closed end of the positioning member 3. The radial position of the long shaft-like part 8 is supported and limited by the liner tube 6 made of metal material, and the filling tube 5 can fill the gap between the long shaft-like part 8 and the positioning member 3, assisting in the support while avoiding or reducing the entry of iron filings.

[0021] Meanwhile, the air outlet pipe 7 is connected to the air source and remains in the air intake state. The air source inflates the positioning member 3 through the air outlet pipe 7 and the air outlet holes 31 to maintain a positive pressure state at the inner end of the long-axis part 8, preventing iron filings generated during machining from entering the positioning member 3.

[0022] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A spindle internal positioning device, comprising a chuck body (1) having a through hole at the center and a tubular pull tube (2) fixed in the through hole of the chuck body (1), characterized in that: The spindle internal positioning device also includes a cylindrical positioning member (3), the closed end of the positioning member (3) is inserted into the drawing tube (2), a plurality of sealing rings (4) are fixed on the outer side of the closed end of the positioning member (3), and the outer side of the sealing ring (4) is tightly against the inner wall of the drawing tube (2), the open end of the positioning member (3) extends out of the drawing tube (2) and is fixed to the chuck body (1), the inner end surface of the closed end of the positioning member (3) is a plane, a filling tube (5) and a liner (6) both in the shape of a circular tube are inserted into the positioning member (3), the liner (6) is made of metal material, the filling tube (5) and the liner (6) are coaxially arranged and distributed along the axial direction of the positioning member (3), and the filling tube (5) and the liner (6) are tightly matched with the positioning member (3).

2. The spindle inner positioning device according to claim 1, characterized in that: There are two liner tubes (6), which are respectively arranged close to the two ends of the positioning member (3); the inner diameter of the liner tube (6) is smaller than the inner diameter of the filling tube (5).

3. A spindle internal positioning device according to claim 2, characterized in that: The inner wall of one end of the liner (6) facing the open end of the positioning member (3) has a conical surface (61), and the diameter of the conical surface (61) gradually increases from the closed end of the positioning member (3) to the open end.

4. A spindle internal positioning device according to claim 1, 2 or 3, characterized in that: An air outlet hole (31) is provided on the closed end of the positioning member (3), one end of the air outlet hole (31) is located at an eccentric position of the inner end of the closed end of the positioning member (3), and the other end of the air outlet hole (31) is located at the center of the outer end of the closed end. The spindle internal positioning device also includes an air outlet pipe (7) plugged into the air outlet hole (31).

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