Machine tool spindle

Abstract

The utility model provides a machine tool spindle and belongs to the technical field of machinery. The problems that machining is inconvenient and machining difficulty is large while the blowing cleaning effect is guaranteed are solved. The broach mechanism comprises a main shaft body, a pull rod and a broach mechanism, the pull rod is sleeved with a conversion piece, an air outlet channel is formed in the main shaft body, the rear end of the pull rod is provided with a main flow channel, and the front end of the pull rod is provided with a water outlet channel; the conversion piece is provided with a flow guide groove and a second air outlet communicated with the air outlet channel; an annular positioning groove is formed in the inner wall of the main shaft body, a first mounting hole is formed in the side portion of the limiting sleeve, a second mounting hole is formed in the front end face of the limiting sleeve and communicated with the first mounting hole, an ejection piece is arranged in the first mounting hole, a locking screw is in threaded connection with the interior of the second mounting hole, and the ejection piece is partially located in the positioning groove and the second mounting hole. The locking screw abuts against the ejection piece. The air blowing device has the advantages of good air blowing cleaning effect, convenience in processing, low processing difficulty and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mechanical technical field relates to a machine tool spindle. BACKGROUND

[0002] In order to guarantee the machining precision, the machine tool spindle with broach function currently all have water outlet and gas blowing function. For example, the structure capable of realizing the conversion of the taper hole gas blowing and the center water outlet function disclosed by patent application No. 202211710929.4, it includes the main shaft body and the taper mouth arranged at the end of the main shaft body, the main shaft body is provided with the puller claw and the puller rod connected with each other, the puller claw is located at one end of the main shaft body close to the taper mouth, and the puller rod is located at one end of the main shaft body away from the taper mouth; the conversion block is arranged on the outer side of the puller rod in the main shaft body, and a predetermined gap is left between the conversion block and the puller rod, the main shaft body, the puller claw, the puller rod and the conversion block are coaxially arranged, the puller rod and the conversion block are provided with the cooling channel for the flow of the cooling liquid, and the puller rod, the conversion block and the main shaft body are provided with the cleaning channel for the flow of the cleaning gas. Among them, the cooling channel includes the main flow channel arranged on the puller rod away from the taper mouth along the length direction of the puller rod, the main flow channel is connected with the water source and the gas source, the first water outlet hole and the second water outlet hole are arranged on the middle part of the puller rod, the puller rod is provided with the secondary flow channel close to the taper mouth along the length direction of the puller rod, the conversion block is provided with the water outlet groove, and the water source, the main flow channel, the first water outlet hole, the water outlet groove, the second water outlet hole and the secondary flow channel are sequentially connected; the cleaning channel includes the first gas outlet hole arranged on the puller rod, the second gas outlet hole arranged on the conversion block, the third gas outlet hole arranged on the main shaft body, and the exhaust hole arranged on the main shaft body along the length direction of the main shaft body, and the gas source, the main flow channel, the first gas outlet hole, the second gas outlet hole, the third gas outlet hole and the exhaust hole are sequentially connected; the exhaust hole includes the main gas hole and the secondary gas hole, the main gas hole is connected with the third gas outlet hole, the outlet of the main gas hole faces the end face of the main shaft body, the secondary gas hole is connected with the main gas hole, and the outlet of the secondary gas hole faces the taper mouth.

[0003] When the main shaft body is in the tight tool state, the puller rod is located on the right side of the main shaft body, the first water outlet hole, the second water outlet hole and the water outlet groove are connected, the first gas outlet hole and the second gas outlet hole are misaligned, the cooling liquid sequentially passes through the main flow channel, the first water outlet hole, the water outlet groove, the second water outlet hole and the secondary flow channel and reaches the taper mouth, and the tool handle at the taper mouth is cooled. When the main shaft body is in the loose tool state, the puller rod is located on the left side of the main shaft body, the first gas outlet hole and the second gas outlet hole are connected, the first gas outlet hole and the water outlet groove are misaligned, the gas sequentially passes through the main flow channel, the first gas outlet hole, the second gas outlet hole, the third gas outlet hole and the main gas hole and reaches the end face of the main shaft body, and the debris and the cooling liquid on the end face of the main shaft body are cleaned, the gas sequentially passes through the main flow channel, the first gas outlet hole, the second gas outlet hole, the third gas outlet hole, the main gas hole and the secondary gas hole and reaches the taper mouth, and the debris and the cooling liquid on the taper mouth and the tool handle are cleaned.

[0004] However, the structure capable of realizing the conversion between the taper hole blowing and the center water outlet function has the following defects: as shown in the accompanying drawings 3 of the specification, the whole drawbar structure is driven by the movement of the pull rod, that is, the drawbar structure is lengthwise driven, and the conversion block is only abutted against the right side of the drawbar structure, which is equivalent to that the conversion block is specially limited in the axial direction in the main shaft body. Thus, when the pull rod moves to loosen the drawbar, the conversion block may be moved with the pull rod, so that the second gas outlet hole arranged on the conversion block and the first gas outlet hole arranged on the pull rod cannot be accurately communicated, thereby affecting the blowing cleaning effect. In view of this situation, a blocking piece is threadedly connected between the drawbar structure and the conversion block in the main shaft body, and the conversion block is positioned in the main shaft body by the blocking piece. Thus, a thread needs to be machined in the main shaft body, but the depth of the main shaft body is deep, and the machining is inconvenient and difficult in practice. Practical new type content

[0005] The utility model discloses a machine tool spindle, solve the problem of inconvenient machining and large machining difficulty while guaranteeing blowing cleaning effect.

[0006] The utility model discloses a machine tool spindle, solve the problem of inconvenient machining and large machining difficulty while guaranteeing blowing cleaning effect.

[0007] A machine tool spindle, including the main shaft body, the pull rod that is arranged in the main shaft body and the drawbar mechanism that is arranged at the front end of the main shaft body and is driven by the pull rod, the pull rod is equipped with the conversion piece, the main shaft body is equipped with the gas outlet, the pull rod rear end is equipped with the main flow channel and its front end is equipped with the water outlet, the conversion piece is equipped with the flow guide groove and the second gas outlet hole that communicates with the gas outlet, the pull rod moves and makes the drawbar mechanism be in the drawbar state, and the main flow channel is communicated with the water outlet through the flow guide groove, the pull rod moves and makes the drawbar mechanism be in the drawbar loosening state, and the main flow channel is communicated with the second gas outlet hole, its characterized in that, the limiting sleeve is arranged between the conversion piece and the drawbar mechanism in the main shaft body, and the pull rod passes through the limiting sleeve, the rear end of the limiting sleeve is abutted against the conversion piece, the inner wall of the main shaft body is equipped with the annular positioning groove, the side portion of the limiting sleeve is equipped with the first mounting hole and its front end surface is equipped with the second mounting hole, the second mounting hole is communicated with the first mounting hole, the ejector is arranged in the first mounting hole, the locking screw is threadedly connected in the second mounting hole, and the ejector is partially located in the positioning groove and the second mounting hole.

[0008] During assembly, the conversion piece is first assembled into the main shaft body, then the ejector is arranged in the first mounting hole of the limiting sleeve and the locking screw is pre-rotated into the second mounting hole, and then the limiting sleeve is assembled into the main shaft body until the front end of the conversion piece abuts against the limiting sleeve. Then, the locking screw is tightened, and the radial extrusion is formed on the ejector along with the tightening of the locking screw, so that a part of the ejector is clamped into the positioning groove, so that the limiting sleeve and the main shaft body are fixed together in the axial direction, and then the position of the conversion piece in the axial direction is positioned. After the installation of the limiting sleeve is completed, the broach mechanism is assembled into the main shaft body.

[0009] The machine tool spindle can firmly position the conversion piece in the main shaft body through the arrangement of the limiting sleeve, so that the conversion piece will not be moved with the pull rod when the pull rod moves to loosen the tool, thereby ensuring the blowing cleaning effect. At the same time, the limiting sleeve is axially fixed by tightening the locking screw to eject the ejector into the positioning groove. Such a structure only needs to simply process an annular positioning groove in the main shaft body, without threading, which is more convenient to process and greatly reduces the processing difficulty.

[0010] In the machine tool spindle, the number of the first mounting hole and the second mounting hole is several, and the first mounting hole is provided with the above-mentioned ejector, and the second mounting hole is provided with the above-mentioned locking screw.

[0011] The arrangement of multiple ejectors and locking screws enables the limiting sleeve to be firmly connected with the main shaft body in the axial direction, so that the conversion piece abutting against the limiting sleeve can be firmly positioned.

[0012] In the machine tool spindle, the ejector is a steel ball, and the ball diameter of the ejector is greater than the hole diameter of the second mounting hole.

[0013] The ejector is a steel ball, and the ball diameter of the ejector is greater than the hole diameter of the second mounting hole, so that even in the case of completely loosening the locking screw, the ejector will not fall into the second mounting hole, thereby ensuring that the locking screw can form a radial extrusion force on the ejector when it is rotated into the second mounting hole during assembly, so that the limiting sleeve and the main shaft body are fixed in the axial direction.

[0014] In the machine tool spindle, the positioning groove is a V-shaped groove.

[0015] The steel ball is round, and the positioning groove is a V-shaped groove, so that in the case of removing the broach mechanism from the main shaft body, the limiting sleeve can be directly taken out of the main shaft body by loosening the locking screw, thereby facilitating the replacement of the conversion piece.

[0016] In the machine tool spindle, the ejector is in block shape along the radial direction of the spindle body, the inner end of the ejector is provided with an inclined guide surface, the locking screw is abutted against the guide surface, and the outer end of the ejector is provided with a matching part matched with the shape of the positioning groove.

[0017] By arranging the inclined guide surface at the inner end of the ejector and abutting the locking screw against the guide surface, when the locking screw is screwed into the second mounting hole, the locking screw moves along the guide surface and ejects the ejector radially out of the first mounting hole.

[0018] In the machine tool spindle, the outer side of the limiting sleeve is provided with an annular sealing groove, and the sealing groove is provided with a sealing ring, and the outer edge of the sealing ring is abutted against the inner wall of the spindle body to form a seal.

[0019] Compared with the prior art, the machine tool spindle can firmly position the conversion piece in the spindle body through the arrangement of the limiting sleeve, so that the conversion piece is not moved by the pull rod when the pull rod moves to loosen the tool, and the blowing cleaning effect is ensured. At the same time, the limiting sleeve is axially fixed by screwing the locking screw and then ejecting the ejector into the positioning groove. Such a structure only needs to simply process an annular positioning groove in the spindle body, without threading, and is more convenient to process and greatly reduces the processing difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a sectional view of the machine tool spindle embodiment one.

[0021] Figure 2 is Figure 1 is a local enlarged view of A in

[0022] In the figure, 1 is a spindle body; 1a is a taper; 1b is an air outlet; 1c is a secondary air hole; 1d is a positioning groove; 2 is a pull rod; 2a is a main flow channel; 2b is a water outlet; 2c is a first air outlet; 2d is a first water outlet; 2e is a second water outlet; 3 is a broach mechanism; 4 is a conversion piece; 4a is a second air outlet; 4b is a first air guide groove; 4c is a flow guide groove; 4d is a second air guide groove; 5 is a limiting sleeve; 5a is a first mounting hole; 5b is a second mounting hole; 5c is a sealing groove; 6 is an ejector; 7 is a locking screw; and 8 is a sealing ring. DETAILED DESCRIPTION

[0023] The following is a specific embodiment of the present application combined with the drawings, which further describes the technical scheme of the present application, but the present application is not limited to these embodiments.

[0024] Embodiment one

[0025] As Figure 1As shown, a machine tool spindle comprises a spindle body 1, a pull rod 2 arranged in the spindle body 1, and a broach mechanism 3 arranged at the front end of the spindle body 1 and driven by the pull rod 2. The pull rod 2 is sleeved with a conversion piece 4, the rear end of the pull rod 2 is provided with a main flow channel 2a along the axial direction, the front end of the pull rod 2 is provided with a water outlet channel 2b along the axial direction, the side of the pull rod 2 is provided with a plurality of first air outlet holes 2c, a plurality of first water outlet holes 2d and a plurality of second water outlet holes 2e along the circumferential direction, the first air outlet holes 2c and the first water outlet holes 2d are communicated with the main flow channel 2a, and the first water outlet holes 2d are located in front of the first air outlet holes 2c, the second water outlet holes 2e are communicated with the water outlet channel 2b, the conversion piece 4 is provided with a plurality of second air outlet holes 4a along the circumferential direction, the inner wall of the conversion piece 4 is provided with an annular first air guide groove 4b and an annular flow guide groove 4c, and the outer wall of the conversion piece 4 is provided with an annular second air guide groove 4d, the second air outlet holes 4a are communicated with the first air guide groove 4b and the second air guide groove 4d at the same time, the flow guide groove 4c is located in front of the first air guide groove 4b, the first water outlet holes 2d and the second water outlet holes 2e are communicated with the flow guide groove 4c at the same time when the first air outlet holes 2c and the first air guide groove 4b are axially dislocated, and the second water outlet holes 2e are dislocated with the flow guide groove 4c when the first air outlet holes 2c and the first air guide groove 4b are communicated. The front end of the spindle body 1 has a taper mouth 1a, the front end of the broach mechanism 3 is located at the taper mouth 1a, the spindle body 1 is provided with an air outlet channel 1b, the inlet of the air outlet channel 1b is communicated with the second air guide groove 4d, the outlet of the air outlet channel 1b is located at the front end face of the spindle body 1, the front end of the spindle body 1 is provided with a secondary air hole 1c communicated with the air outlet channel 1b, and the secondary air hole 1c is communicated with the taper mouth 1a.

[0026] The same as the prior art, in use, the main flow channel 2a of the pull rod 2 is communicated with the gas source and the cooling liquid source. In the broaching state of the machine tool spindle, the first air outlet holes 2c and the first air guide groove 4b are axially dislocated, at this time, the first water outlet holes 2d and the second water outlet holes 2e are communicated with the flow guide groove 4c at the same time, and the cooling liquid is sequentially supplied outwards through the main flow channel 2a, the first water outlet holes 2d, the flow guide groove 4c, the second water outlet holes 2e and the water outlet channel 2b to cool the broach shank at the taper mouth 1a. When the broach is loosened, the pull rod 2 moves forward and drives the broach mechanism 3 to act, and the second water outlet holes 2e and the flow guide groove 4c are axially dislocated by the movement of the pull rod 2, that is, the first water outlet holes 2d and the second water outlet holes 2e are no longer communicated, at the same time, the first air outlet holes 2c and the first air guide groove 4b are communicated, and the gas is sequentially introduced into the air outlet channel 1b through the main flow channel 2a, the first air outlet holes 2c, the first air guide groove 4b, the second air guide groove and the second air guide groove 4d. A part of the gas in the air outlet channel 1b will be directly blown out from the end face of the spindle body 1, and the other part will be blown into the taper mouth 1a by means of the secondary air hole 1c, so as to clean the broach shank, the debris and the cooling liquid at the taper mouth 1a.

[0027] As Figure 1 and Figure 2The main shaft body 1 is provided with a limiting sleeve 5 between the conversion piece 4 and the broach mechanism 3, the pull rod 2 passes through the limiting sleeve 5, and the rear end of the limiting sleeve 5 abuts against the conversion piece 4. The inner wall of the main shaft body 1 is provided with an annular positioning groove 1d, the side of the limiting sleeve 5 is provided with a first mounting hole 5a, and the front end face of the limiting sleeve 5 is provided with a second mounting hole 5b, the second mounting hole 5b is in communication with the first mounting hole 5a, the first mounting hole 5a is provided with an ejection piece 6, the second mounting hole 5b is threadedly connected with a locking screw 7, the ejection piece 6 is partially located in the positioning groove 1d and the second mounting hole 5b, and the locking screw 7 abuts against the ejection piece 6. The outer side of the limiting sleeve 5 is provided with an annular sealing groove 5c, the sealing groove 5c is provided with a sealing ring 8, the outer edge of the sealing ring 8 abuts against the inner wall of the main shaft body 1 to form a seal, and the sealing ring 8 can prevent high-pressure cooling liquid from leaking from the gap between the limiting sleeve 5 and the main shaft body 1.

[0028] During assembly, the conversion piece 4 is first assembled into the main shaft body 1, then the ejection piece 6 is arranged in the first mounting hole 5a of the limiting sleeve 5, and the locking screw 7 is pre-rotated into the second mounting hole 5b, and then the limiting sleeve 5 is assembled into the main shaft body 1 until the front end of the limiting sleeve 5 abuts against the conversion piece 4. Then, the locking screw 7 is tightened, and the ejection piece 6 is extruded in the radial direction as the locking screw 7 is tightened, so that a part of the ejection piece 6 is clamped into the positioning groove 1d, so that the limiting sleeve 5 and the main shaft body 1 are fixed together in the axial direction, and then the position of the conversion piece 4 in the axial direction is also positioned. After the limiting sleeve 5 is assembled, the broach mechanism 3 is assembled into the main shaft body 1.

[0029] The main shaft of the machine tool can firmly position the conversion piece 4 in the main shaft body 1 through the limiting sleeve 5, so that the conversion piece 4 will not be moved with the pull rod 2 when the pull rod 2 moves to loosen the tool, thereby ensuring the blowing cleaning effect. At the same time, the limiting sleeve 5 is axially fixed by tightening the locking screw 7 and then ejecting the ejection piece 6 into the positioning groove 1d, and such a structure only needs to simply process an annular positioning groove 1d in the main shaft body 1, without threading, and is more convenient to process and greatly reduces the processing difficulty.

[0030] As Figure 1 and Figure 2As shown in the figure, the number of the first mounting holes 5a and the second mounting holes 5b is several, the first mounting hole 5a is provided with the above-mentioned ejector 6, and the second mounting hole 5b is threadedly connected with the above-mentioned locking screw 7. The ejector 6 is a steel ball, the ball diameter of the ejector 6 is larger than the hole diameter of the second mounting hole 5b, and the positioning groove 1d is a V-shaped groove. The ejector 6 is a steel ball, the ball diameter of the ejector 6 is larger than the hole diameter of the second mounting hole 5b, so that even in the case of the whole loosening of the locking screw 7, the ejector 6 will not fall into the second mounting hole 5b, thereby ensuring that the locking screw 7 is screwed into the second mounting hole 5b during assembly, so that the radial extrusion force is formed on the ejector 6, the ejector 6 is partially clamped into the positioning groove 1d, and the limiting sleeve 5 is fixed along the axial direction of the main shaft body 1.

[0031] Embodiment two

[0032] The structure and principle of the embodiment are basically the same as those of the embodiment one, and the difference is that in the embodiment, the ejector 6 is in a block shape along the radial direction of the main shaft body 1, the inner end of the ejector 6 is provided with an inclined guide surface, the locking screw 7 abuts against the guide surface, and the outer end of the ejector 6 has a matching part matched with the shape of the positioning groove 1d.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A machine tool spindle, comprising a spindle body (1), a pull rod (2) arranged in the spindle body (1), and a broach mechanism (3) arranged at the front end of the spindle body (1) and driven by the pull rod (2), the pull rod (2) being sleeved with a conversion piece (4), the spindle body (1) being provided with an air outlet (1b), the rear end of the pull rod (2) being provided with a main flow channel (2a) and the front end being provided with a water outlet (2b), the conversion piece (4) being provided with a flow guide groove (4c) and a second air outlet (4a) communicating with the air outlet (1b), the main flow channel (2a) and the water outlet (2b) being communicated through the flow guide groove (4c) when the pull rod (2) moves to make the broach mechanism (3) in a broaching state, and the main flow channel (2a) and the second air outlet (4a) being communicated when the pull rod (2) moves to make the broach mechanism (3) in a loosening state, characterized in that, The main shaft body (1) is provided with a limiting sleeve (5) between the conversion piece (4) and the broach mechanism (3), the pull rod (2) passes through the limiting sleeve (5), the rear end of the limiting sleeve (5) abuts against the conversion piece (4), the inner wall of the main shaft body (1) is provided with an annular positioning groove (1d), the side of the limiting sleeve (5) is provided with a first mounting hole (5a) and the front end face is provided with a second mounting hole (5b), the second mounting hole (5b) is in communication with the first mounting hole (5a), the first mounting hole (5a) is provided with an ejection piece (6), the second mounting hole (5b) is threadedly connected with a locking screw (7), the ejection piece (6) is partially located in the positioning groove (1d) and the second mounting hole (5b), and the locking screw (7) abuts against the ejection piece (6).

2. A machine tool spindle as claimed in claim 1, characterised in that The first mounting hole (5a) and the second mounting hole (5b) are both provided with a plurality of the ejection pieces (6) and the locking screws (7).

3. A machine tool spindle as claimed in claim 1 or 2, characterised in that, The ejection piece (6) is a steel ball, and the diameter of the ball is greater than the diameter of the second mounting hole (5b).

4. A machine tool spindle as claimed in claim 3, characterised in that The positioning groove (1d) is a V-shaped groove.

5. A machine tool spindle as claimed in claim 1 or 2, characterised in that, The ejection piece (6) is block-shaped along the radial direction of the main shaft body (1), the inner end of the ejection piece (6) is provided with an inclined guide surface, the locking screw (7) abuts against the guide surface, and the outer end of the ejection piece (6) has a matching part matched with the shape of the positioning groove (1d).

6. A machine tool spindle as claimed in claim 1 or 2, characterised in that, The outer side of the limiting sleeve (5) is provided with an annular sealing groove (5c), the sealing groove (5c) is provided with a sealing ring (8), and the outer edge of the sealing ring (8) abuts against the inner wall of the main shaft body (1) to form a seal.

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