A spindle device

Abstract

The utility model provides a kind of main shaft device, belong to lathe technical field.It solves the problem of the existing spacer sleeve processing difficulty.This main shaft device, including main shaft box, chuck rotatably connected in one side of main shaft box and the pull tube of circular tubular shape horizontally arranged in main shaft box, the chuck with the pull tube coaxial line setting and both are fixedly connected, the pull tube is coaxially arranged with the spacer sleeve of cylinder shape, annular gap is formed between the outside of spacer sleeve and the inside of pull tube, recess of recessed annular shape is set in the outside of both ends of spacer sleeve, two The sealing ring of annular shape is arranged in two recesses, the inside of two sealing rings is tightly abutted on the bottom surface of recess, the outside of two sealing rings is protruded recess and is tightly abutbed with the inside of pull tube.This main shaft device in spacer sleeve has the advantage of processing convenient.

Description

Technical Field

[0001] This utility model belongs to the field of machine tool technology and relates to a spindle device. Background Technology

[0002] Before machining, the workpiece needs to be clamped and positioned. For long shaft workpieces, both axial and radial positioning are required. Existing spindle devices generally include a spindle box, a horizontally inserted cylindrical draw tube inside the spindle box, and a chuck rotatably connected to one side of the spindle box for clamping the workpiece. When the diameter of a long shaft workpiece is smaller than the inner diameter of the draw tube inside the spindle box, and the long shaft workpiece needs to pass through the chuck and be placed inside the draw tube, a spacer needs to be installed between the draw tube and the workpiece to prevent vibrations caused by high-speed rotation of the spindle, draw tube, chuck, and workpiece, which could affect machining.

[0003] In actual processing and assembly, the spacer and the drawing tube are fitted with a clearance. The clearance between them cannot be too small; otherwise, the spacer will be difficult to insert into the drawing tube, and it will be even more difficult to remove after prolonged use due to thermal expansion. This makes it inconvenient to change the specifications of the workpiece or to perform maintenance. If the clearance is too large, the radial support effect on the workpiece will be poor, and vibration will easily occur, affecting processing. As a result, the spacer requires high dimensional accuracy and is difficult to process. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a spindle device that solves the problem of high processing difficulty in existing spacers.

[0005] The objective of this utility model can be achieved through the following technical solutions: A spindle assembly includes a spindle housing, a chuck rotatably connected to one side of the spindle housing, and a cylindrical pull tube horizontally inserted into the spindle housing. The chuck and the pull tube are coaxially aligned and fixedly connected. A cylindrical spacer is coaxially inserted into the pull tube. The spacer has an annular gap between its outer surface and the inner surface of the pull tube. An annular groove is formed on the outer sides of both ends of the spacer. An annular sealing ring is provided in each of the two grooves. The inner sides of the two sealing rings tightly abut against the bottom surface of the grooves, and the outer sides of the two sealing rings extend out of the grooves and tightly abut against the inner surface of the pull tube.

[0006] In this spindle assembly, the sealing rings are not used as sealing elements; they serve a supporting function. The spacer and the drawing tube are supported by the sealing rings at both ends of the spacer, allowing for a larger annular gap between the outer surface of the spacer and the inner surface of the drawing tube. This facilitates the installation and removal of the spacer within the drawing tube, reducing the precision requirements for its machining, and ensures stable contact between the drawing tube and the spacer. This, in turn, enables better radial positioning of long shaft-type workpieces and prevents vibrations during machining from affecting the machining results. Furthermore, sealing rings are chosen for support because they are standard parts, resulting in lower replacement costs.

[0007] In the aforementioned spindle assembly, the axial width of the groove is greater than the axial width of the sealing ring. Compared to conventional methods in the art where the width of the sealing groove is the same as or even slightly smaller than the width of the sealing ring, a wider groove provides sufficient axial deformation space for the sealing ring when subjected to radial compression, reducing the degree of compression and tightening of the sealing ring and facilitating the assembly and disassembly of the spacer.

[0008] In one of the aforementioned spindle devices, the ratio of the axial width of the groove to the axial width of the sealing ring is 1.2 to 2. This ratio ensures that the groove provides axial space for deformation of the sealing ring while maintaining the strength of the spacer itself, thus providing better support.

[0009] In the aforementioned spindle device, there are several spacers, each with a sealing ring fitted at both ends, and the spacers are coaxially arranged. This coaxial arrangement of multiple spacers provides multi-point support along the length of the tube, resulting in better support and positioning.

[0010] In the aforementioned spindle assembly, several spacers have the same inner diameter, and any two adjacent spacers abut against each other. The fact that several spacers have the same inner diameter and abut against each other provides better radial positioning support for long shaft-type workpieces.

[0011] Compared with existing technologies, this spindle device enables the spacer and the drawing tube to be supported by sealing rings at both ends of the spacer. This allows for a larger annular gap between the outer side of the spacer and the inner side of the drawing tube, which reduces the machining accuracy requirements of the spacer, facilitates the assembly and disassembly of the spacer inside the drawing tube, and ensures stable contact between the drawing tube and the spacer. This results in better radial positioning of long shaft-type workpieces and avoids vibration during machining that could affect the machining effect. Attached Figure Description

[0012] Figure 1 This is a cross-sectional structural schematic diagram of the main spindle device.

[0013] Figure 2 This is a cross-sectional structural diagram of the fit between the spacer and the sealing ring in this spindle assembly.

[0014] In the figure, 1 is the spindle box; 2 is the chuck; 3 is the pull tube; 4 is the spacer; 4a is the groove; 5 is the clearance; 6 is the sealing ring; and 7 is the workpiece. Detailed Implementation

[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0016] like Figure 1 and Figure 2 As shown, this spindle assembly includes a spindle housing 1, a chuck 2 rotatably connected to one side of the spindle housing 1, and a cylindrical pull tube 3 horizontally inserted inside the spindle housing 1. The chuck 2 and the pull tube 3 are coaxially aligned and fixedly connected. Here, the spindle housing 1, the pull tube 3, and the chuck 2 are all existing technologies, and their specific positions and connection methods will not be described in detail. The chuck 2 can be a three-jaw chuck.

[0017] Several cylindrical spacers 4 are coaxially inserted inside the tube 3. The spacers 4 have the same specifications, that is, the inner diameter, outer diameter and axial length are the same, and they are all made of nylon material. The opposite ends of any two adjacent spacers 4 abut against each other.

[0018] An annular gap 5 is formed between the outer surface of all spacers 4 and the inner surface of the pull tube 3. Each spacer 4 has an annular groove 4a recessed at both ends of its outer side. The groove 4a is coaxial with the spacer 4. An annular sealing ring 6 is provided within each groove 4a. The inner side of each sealing ring 6 tightly abuts against the bottom surface of the corresponding groove 4a, and the outer side of each sealing ring 6 extends out of the groove 4a and tightly abuts against the inner surface of the pull tube 3. In this embodiment, the axial width of the groove 4a is greater than the axial width of the sealing ring 6, and the ratio can be 1.2 or 2. Preferably, the axial width of the groove 4a is 1.5 times the axial width of the sealing ring 6.

[0019] In this spindle assembly, the sealing ring 6 is not used as a sealing element, i.e., it does not serve a sealing function, but rather a supporting function. The sealing rings 6 at both ends of the spacer 4 provide abutment and support, achieving stable contact between the spacer 4 and the spacer 3. This, in turn, enables better radial positioning of long shaft-type workpieces 7, preventing vibration during machining from affecting the machining effect. Consequently, the required machining accuracy of the outer diameter of the spacer 4 is reduced, allowing for a larger annular gap 5 between the outer surface of the spacer 4 and the inner surface of the spacer 3, facilitating the installation and removal of the spacer 4 within the spacer 3.

[0020] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A spindle assembly, comprising a spindle housing (1), a chuck (2) rotatably connected to one side of the spindle housing (1), and a tubular pull tube (3) horizontally inserted into the spindle housing (1), wherein the chuck (2) and the pull tube (3) are coaxially arranged and fixedly connected, and a cylindrical spacer (4) is coaxially inserted into the pull tube (3), characterized in that, An annular gap (5) is formed between the outer side of the spacer (4) and the inner side of the pull tube (3). The outer sides of both ends of the spacer (4) are provided with recessed annular grooves (4a). Annular sealing rings (6) are provided in both grooves (4a). The inner sides of the two sealing rings (6) are tightly abutted against the bottom surface of the groove (4a). The outer sides of the two sealing rings (6) extend out of the grooves (4a) and are tightly abutted against the inner side of the pull tube (3).

2. The spindle device according to claim 1, characterized in that, The axial width of the groove (4a) is greater than the axial width of the sealing ring (6).

3. A spindle device according to claim 2, characterized in that, The ratio of the axial width of the groove (4a) to the axial width of the sealing ring (6) is 1.2 to 2.

4. A spindle device according to claim 1, 2, or 3, characterized in that, The number of spacers (4) is several, and the two ends of the spacers (4) are fitted with the above-mentioned sealing rings (6), and the spacers (4) are arranged coaxially.

5. A spindle device according to claim 4, characterized in that, The inner diameter of several spacers (4) is the same, and any two adjacent spacers (4) abut against each other.

Images