Tailstock for numerical control machine tool

Abstract

The utility model belongs to the technical field of numerical control machine tools, and provides a tailstock for a numerical control machine tool, which comprises a tailstock body, a mounting cylinder and a clamping component. The telescopic assembly is controlled to drive the mounting cylinder to stretch out and draw back, so that the mounting cylinder can drive the center shaft to move close to or away from a workpiece, and the center shaft is driven to support the workpiece or cancel support on the workpiece conveniently; the fixing rod moves close to the axis of the center shaft to drive the clamping block to move so that the clamping block can be separated from the clamping groove, at the moment, the center shaft can be pulled out of the sleeve, the center shaft is convenient to disassemble, then the replaced center shaft is arranged in the sleeve in a penetrating mode, the clamping block corresponds to the clamping groove, and then the driving piece is rotated to drive the fixing rod to move away from the axis of the center shaft. The fixing rod moves away from the axis of the center shaft to drive the clamping block to move so that the clamping block can be arranged in the clamping groove in a penetrating mode, at the moment, the center shaft can be fixed in the sleeve, and the center shaft is convenient to install and replace in a labor-saving mode.

Description

Technical Field

[0001] The utility model relates to the technical field of numerically controlled machine tools, in particular to a tailstock for numerically controlled machine tools. Background Art

[0002] CNC machine tools are a type of mechanical equipment that uses digital control technology for machine processing. It combines traditional mechanical processing with modern computer technology, and controls the movement and processing of machine tools through preset programs, thereby achieving high-precision parts processing.

[0003] The tailstock is a key auxiliary component in CNC machine tools. The support it provides is particularly important when machining long, thin, or heavy workpieces. It prevents deformation or displacement of the workpiece due to uneven force during machining. The spindle in existing CNC machine tool tailstocks is often directly connected to the bearing with a transition fit, making installation and removal of the spindle difficult and laborious, as well as replacement. Therefore, to address these technical issues, a tailstock for CNC machine tools is proposed. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a tailstock for a CNC machine tool, which makes it convenient and labor-saving to replace the center spindle.

[0005] A tailstock for a CNC machine tool, comprising:

[0006] The tailstock body has a fixing hole at one end;

[0007] A mounting tube is inserted into the fixing hole and connected to the tailstock body via a telescopic assembly, and is used to drive the mounting tube to extend and retract axially along the fixing hole. A mounting hole is provided at one end of the mounting tube, and multiple groups of angular contact ball bearings are provided in the mounting hole. The inner rings of the multiple groups of angular contact ball bearings are transitionally fitted with sleeves. The mounting hole opening is bolted to a bearing gland, and one end of the top shaft passes through the bearing gland and is inserted into the sleeve; and

[0008] The clamping assembly includes a fixing rod and a driving member. A guide groove is provided on the circumferential side of the top shaft. The fixing rod can be slid radially along the top shaft in the guide groove. A clamping block is provided at one end of the fixing rod. A clamping groove is provided on the inner side of the sleeve. The driving member is rotatably provided on the top shaft and connected to the fixing rod. Rotating the driving member can drive the fixing rod to slide so that the clamping block can be clamped in the clamping groove.

[0009] The beneficial effects of the tailstock for a CNC machine tool are as follows:

[0010] By controlling the telescopic assembly to drive the installation tube to extend and retract, the installation tube can drive the top shaft to move closer to or away from the workpiece, and it is convenient to drive the top shaft to support the workpiece or cancel the support for the workpiece. When the top shaft needs to be replaced, the fixed rod is driven by the rotating drive member to move close to the axis of the top shaft. The movement of the fixed rod close to the axis of the top shaft can drive the block to move so that the block is separated from the slot. At this time, the top shaft can be pulled out from the sleeve, and the top shaft can be easily disassembled. Then, the replaced top shaft is inserted into the sleeve, and the block is made to correspond to the slot. Then, the driving member is rotated to drive the fixed rod away from the axis of the top shaft. The movement of the fixed rod away from the axis of the top shaft can drive the block to move so that the block is inserted into the slot. At this time, the top shaft can be fixed in the sleeve, which is convenient for installing the top shaft and replacing the top shaft is convenient and labor-saving.

[0011] In one embodiment, the clamping assembly comprises two sets, and the two sets of clamping assemblies are symmetrically arranged on the spindle relative to the spindle axis. Providing two sets of clamping assemblies improves the stability of the connection between the spindle and the sleeve. Furthermore, the two sets of clamping assemblies are symmetrically arranged relative to the spindle axis. When the workpiece rotates and drives the spindle to rotate, the force applied to the spindle and the sleeve is balanced.

[0012] In one embodiment, the driving member includes a screw, which is radially disposed along the top axis and rotatably disposed on the top axis, and is threadedly connected to the other end of the fixing rod. The fixing rod can be driven to move by rotating the screw so that the screw rotates and engages with the fixing rod thread. The fixing rod can be driven to move in the opposite direction by rotating the screw in the opposite direction so that the screw rotates in the opposite direction and engages with the fixing rod thread. This facilitates driving the fixing rod to move radially along the top axis, and the fixing rod can be fixed by stopping the screw so that the screw engages with the fixing rod thread. This facilitates fixing the fixing rod after movement.

[0013] In one embodiment, the screws in the two sets of the clamping assemblies rotate in opposite directions and are coaxially connected via a connecting shaft. This facilitates rotating one set of screws to drive the other set of screws. The synchronous rotation of the two sets of screws, in conjunction with the screws of the two sets of fixing rods, can drive the two sets of fixing rods to move closer together, causing the two sets of clamping blocks to separate from the clamping slots and cancel the fixation of the top shaft, or drive the two sets of fixing rods to move away from each other, causing the two sets of clamping blocks to be locked in the clamping slots and secure the top shaft. This facilitates synchronous adjustment of the two sets of clamping assemblies to secure or cancel the fixation of the top shaft.

[0014] In one embodiment, a spring sheet is disposed on the inner side of the sleeve, on which a positioning hemisphere is mounted. A positioning ball groove is formed on the circumference of the top shaft, into which the positioning hemisphere can be retained. The positioning hemisphere cooperates with the positioning ball groove to facilitate pre-positioning of the top shaft, facilitating alignment of the clamping block with the clamping groove, thereby facilitating subsequent insertion of the clamping block into the clamping groove to secure the top shaft.

[0015] In one embodiment, the telescopic assembly includes a hydraulic telescopic column; a receiving hole is defined at one end of the mounting tube, the hydraulic telescopic column is positioned within the receiving hole, and the fixed end is bolted to the tailstock body, while the telescopic end is bolted to the mounting tube. The mounting tube can be easily extended or retracted by controlling the extension and retraction of the hydraulic telescopic column. Furthermore, the location of the hydraulic telescopic column within the receiving hole reduces the space occupied by the hydraulic telescopic column and the mounting tube, thereby improving the overall compactness of the device and reducing the space occupied by the device.

[0016] In one embodiment, the fixing hole extends through the tailstock body. An end cap covering the opening of the fixing hole is fixed to the end of the tailstock body away from the spindle via bolts. The fixed end of the hydraulic telescopic column is connected to the end cap via bolts. The mounting tube and the hydraulic telescopic column can be removed by removing the end cap, making installation and removal of the mounting tube and the hydraulic telescopic column convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the specific embodiments. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a tailstock for a CNC machine tool provided in one embodiment of the utility model;

[0019] Figure 2 for Figure 1 The figure shows a cutaway right side view of a tailstock for a CNC machine tool;

[0020] Figure 3 for Figure 1 An exploded view of a tailstock for a CNC machine tool after the tailstock body is cut away;

[0021] Figure 4 for Figure 1 An exploded view of a sectioned mounting barrel in a tailstock for a CNC machine tool is shown;

[0022] Figure 5 for Figure 1 The figure shows a right side view of a tailstock sleeve and a center spindle for a CNC machine tool after being cut away;

[0023] Figure 6 for Figure 1 An exploded view of a clamping assembly in a tailstock for a CNC machine tool is shown.

[0024] Reference numerals:

[0025] 10. Tailstock body; 101. Fixing hole; 102. End cover;

[0026] 20. Mounting cylinder; 201. Mounting hole; 202. Angular contact ball bearing; 203. Sleeve; 2031. Slot; 2032. Spring leaf; 2033. Positioning hemisphere; 204. Bearing gland; 205. Centering spindle; 2051. Guide groove; 2052. Positioning ball groove; 206. Hydraulic telescopic column; 207. Storage hole;

[0027] 30. Snap-fit assembly; 301. Clamping block; 302. Fixing rod; 303. Screw rod; 304. Connecting shaft. DETAILED DESCRIPTION

[0028] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0029] See also Figures 1 to 6 In one embodiment, a tailstock for a CNC machine tool includes a tailstock body 10, a mounting cylinder 20 and a clamping assembly 30.

[0030] A fixing hole 101 is defined at one end of the tailstock body 10. A mounting tube 20 is inserted into the fixing hole 101 and connected to the tailstock body 10 via a telescopic assembly, which is used to drive the mounting tube 20 to extend and retract axially along the fixing hole 101. A mounting hole 201 is defined at one end of the mounting tube 20. Multiple sets of angular contact ball bearings 202 are disposed within the mounting hole 201. The inner rings of the multiple sets of angular contact ball bearings 202 are transitionally fitted with sleeves 203. A bearing gland 204 is bolted to the opening of the mounting hole 201. One end of a top shaft 205 passes through the bearing gland 204 and is inserted into the sleeve 203. The clamping assembly 30 includes a fixed rod 302 and a driving member. A guide groove 2051 is provided on the circumference of the top shaft 205. The fixed rod 302 can be set in the guide groove 2051 and can slide radially along the top shaft 205. A clamping block 301 is provided at one end of the fixed rod 302, and a clamping groove 2031 is provided on the inner side of the sleeve 203. The driving member is rotatably provided on the top shaft 205 and connected to the fixed rod 302. The rotating driving member can drive the fixed rod 302 to slide so that the clamping block 301 can be clamped in the clamping groove 2031.

[0031] In the above embodiment, by controlling the telescopic assembly to drive the installation cylinder 20 to extend and retract, the installation cylinder 20 can drive the top shaft 205 to move closer to or away from the workpiece (not shown), and drive the top shaft 205 to support the workpiece or cancel the support for the workpiece. When the top shaft 205 needs to be replaced, the fixed rod 302 is driven by the rotating driving member to move close to the axis of the top shaft 205. The movement of the fixed rod 302 close to the axis of the top shaft 205 can drive the clamping block 301 to move so that the clamping block 301 is separated from the clamping groove 2031, and the clamping block 301 can be withdrawn from the sleeve 203 at this time. The top shaft 205 is taken out and disassembled conveniently, and then the replaced top shaft 205 is inserted into the sleeve 203, and the clamping block 301 is made to correspond to the clamping slot 2031, and then the driving part is rotated to drive the fixing rod 302 to move away from the axis of the top shaft 205. The movement of the fixing rod 302 away from the axis of the top shaft 205 can drive the clamping block 301 to move so that the clamping block 301 is inserted into the clamping slot 2031. At this time, the top shaft 205 can be fixed in the sleeve 203, and the installation of the top shaft 205 is convenient, and the replacement of the top shaft 205 is convenient and labor-saving.

[0032] See also Figure 5 and Figure 6 In one embodiment, two sets of clamping assemblies 30 are provided, and the two sets of clamping assemblies 30 are symmetrically arranged on the top shaft 205 relative to the axis of the top shaft 205. The provision of two sets of clamping assemblies 30 can improve the stability of the connection between the top shaft 205 and the sleeve 203. The two sets of clamping assemblies 30 are symmetrically arranged relative to the axis of the top shaft 205. When the workpiece rotates to drive the top shaft 205 to rotate, the force applied to the sleeve 203 by the top shaft 205 can be improved.

[0033] On the basis of the above embodiment, the driving member further includes a screw 303, which is arranged radially along the top shaft 205 and is rotatably arranged on the top shaft 205. The screw 303 is threadedly connected to the other end of the fixed rod 302. By rotating the screw 303, the screw 303 rotates and engages with the thread of the fixed rod 302, thereby driving the fixed rod 302 to move. By rotating the screw 303 in the opposite direction, the screw 303 rotates in the opposite direction and engages with the thread of the fixed rod 302, thereby driving the fixed rod 302 to move in the opposite direction. The fixed rod 302 can be easily driven to move radially along the top shaft 205, and the fixed rod 302 can be fixed by stopping the screw 303 and engaging with the thread of the fixed rod 302. The fixed rod 302 can be easily fixed after it has moved.

[0034] On the basis of the above embodiment, further, the screw rods 303 in the two sets of clamping assemblies 30 have opposite rotation directions, and the two sets of screw rods 303 are coaxially connected by a connecting shaft 304. This facilitates the rotation of one set of screw rods 303 to drive the other set of screw rods 303 to rotate. The two sets of screw rods 303 rotate synchronously and engage with the threads of the two sets of fixing rods 302, thereby driving the two sets of fixing rods 302 to move relatively close to each other, so that the two sets of clamping blocks 301 are separated from the clamping slots 2031 to cancel the fixation of the top shaft 205, or driving the two sets of fixing rods 302 to move relatively far apart, so that the two sets of clamping blocks 301 are locked in the clamping slots 2031 to fix the top shaft 205. This facilitates the synchronous adjustment of the two sets of clamping assemblies 30 to fix or cancel the fixation of the top shaft 205.

[0035] See also Figure 5 and Figure 6 In one embodiment, a spring sheet 2032 is disposed on the inner side of the sleeve 203, and a positioning hemisphere 2033 is disposed on the spring sheet 2032. A positioning ball groove 2052 is formed on the circumference of the top shaft 205, and the positioning hemisphere 2033 can be locked in the positioning ball groove 2052. The positioning hemisphere 2033 cooperates with the positioning ball groove 2052 to facilitate pre-positioning of the top shaft 205, facilitate alignment of the clamping block 301 with the clamping groove 2031, and facilitate subsequent insertion of the clamping block 301 into the clamping groove 2031 to secure the top shaft 205.

[0036] See also Figures 1 to 3 In one embodiment, the telescopic assembly includes a hydraulic telescopic column 206; a receiving hole 207 is defined at one end of the mounting tube 20. The hydraulic telescopic column 206 is positioned within the receiving hole 207, with the fixed end connected to the tailstock body 10 via bolts, and the telescopic end connected to the mounting tube 20 via bolts. The mounting tube 20 can be easily extended or retracted by controlling the extension and retraction of the hydraulic telescopic column 206. Furthermore, the location of the hydraulic telescopic column 206 within the receiving hole 207 reduces the space occupied by the hydraulic telescopic column 206 and the mounting tube 20, thereby improving the overall compactness of the device and reducing its footprint.

[0037] In addition to the above embodiment, a fixing hole 101 extends through the tailstock body 10. An end cap 102 covering the opening of the fixing hole 101 is fixed to the end of the tailstock body 10 away from the center spindle 205 via bolts. The fixed end of the hydraulic telescopic column 206 is also bolted to the end cap 102. The mounting cylinder 20 and the hydraulic telescopic column 206 can be removed by removing the end cap 102, making installation and removal of the mounting cylinder 20 and the hydraulic telescopic column 206 convenient.

[0038] The specific implementation of the above-mentioned tailstock for CNC machine tools is as follows:

[0039] The extension and retraction of the hydraulic telescopic column 206 can drive the installation cylinder 20 to extend and retract, and the extension and retraction of the installation cylinder 20 can drive the top shaft 205 to move closer to or away from the workpiece, and the top shaft 205 can be driven to support the workpiece or cancel the support for the workpiece. When the top shaft 205 needs to be replaced, by rotating one of the sets of screws 303, the rotation of the screw 303 drives the other set of screws 303 to rotate through the connecting shaft 304. The rotation of the two sets of screws 303 and the threaded cooperation of the two sets of fixing rods 302 can drive the two sets of fixing rods 302 to move relatively close to each other. The relative close movement of the two sets of fixing rods 302 can drive the two sets of clamping blocks 301 to separate from the clamping slots 2031. At this time, the fixation of the top shaft 205 can be cancelled, and the top shaft 205 can be moved away from the top shaft 205 by applying an axial force to the top shaft 205. The sleeve 203 is pulled out, and then the top shaft 205 is removed. The replaced top shaft 205 is then inserted into the sleeve 203, and the positioning hemisphere 2033 is clamped in the positioning ball groove 2052. At this time, the two groups of blocks 301 correspond to the slots 2031, and one group of screws 303 is rotated in the opposite direction. The screw 303 rotates in the opposite direction and drives the other group of screws 303 to rotate in the opposite direction through the connecting shaft 304. The two groups of screws 303 rotate in the opposite direction and cooperate with the threads of the two groups of fixing rods 302 to drive the two groups of fixing rods 302 to move relatively away from each other. The relative movement of the two groups of fixing rods 302 can drive the two groups of blocks 301 to be inserted into the slots 2031, thereby fixing the top shaft 205. The top shaft 205 is easy to install and disassemble, and replacing the top shaft 205 is convenient and labor-saving.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A tailstock for a CNC machine tool, characterized in that: include: The tailstock body (10) has a fixing hole (101) at one end; A mounting tube (20) is inserted into the fixing hole (101) and is connected to the tailstock body (10) via a telescopic assembly, and is used to drive the mounting tube (20) to axially extend and retract along the fixing hole (101). A mounting hole (201) is provided at one end of the mounting tube (20), and multiple groups of angular contact ball bearings (202) are provided in the mounting hole (201). The inner rings of the multiple groups of angular contact ball bearings (202) are transitionally matched with sleeves (203). The opening of the mounting hole (201) is bolted to a bearing cover (204), and one end of the top shaft (205) passes through the bearing cover (204) and is inserted into the sleeve (203); and The clamping assembly (30) comprises a fixing rod (302) and a driving member. A guide groove (2051) is provided on the circumference of the top shaft (205). The fixing rod (302) can be radially slid along the top shaft (205) and is arranged in the guide groove (2051). A clamping block (301) is provided at one end of the fixing rod (302). A clamping groove (2031) is provided on the inner side of the sleeve (203). The driving member is rotatably arranged on the top shaft (205) and connected to the fixing rod (302). Rotating the driving member can drive the fixing rod (302) to slide, so that the clamping block (301) can be clamped in the clamping groove (2031).

2. A tailstock for a CNC machine tool according to claim 1, characterized in that: The clamping components (30) are provided in two groups, and the two groups of the clamping components (30) are symmetrically arranged on the top shaft (205) relative to the axis of the top shaft (205).

3. A tailstock for a CNC machine tool according to claim 2, characterized in that: The driving member includes a screw rod (303), which is radially arranged along the top shaft (205) and rotatably arranged on the top shaft (205). The screw rod (303) is threadedly connected to the other end of the fixing rod (302).

4. A tailstock for a CNC machine tool according to claim 3, characterized in that: The rotation directions of the screw rods (303) in the two groups of the clamping assemblies (30) are opposite, and the two groups of the screw rods (303) are coaxially connected via a connecting shaft (304).

5. The tailstock for a CNC machine tool according to claim 1, characterized in that: A spring sheet (2032) is provided on the inner side of the sleeve (203), a positioning hemisphere (2033) is provided on the spring sheet (2032), a positioning ball groove (2052) is provided on the circumference of the top shaft (205), and the positioning hemisphere (2033) can be clamped in the positioning ball groove (2052).

6. The tailstock for a CNC machine tool according to claim 1, characterized in that: The telescopic assembly includes a hydraulic telescopic column (206); a receiving hole (207) is opened at one end of the mounting tube (20); the hydraulic telescopic column (206) is located in the receiving hole (207), and the fixed end is connected to the tailstock body (10) through a bolt, and the telescopic end is connected to the mounting tube (20) through a bolt.

7. The tailstock for a CNC machine tool according to claim 6, characterized in that: The fixing hole (101) passes through the tailstock body (10); an end portion of the tailstock body (10) away from the top spindle (205) is fixed with an end cover (102) covering the opening of the fixing hole (101) by means of bolts; and a fixed end of the hydraulic telescopic column (206) is connected to the end cover (102) by means of bolts.

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