Feeding mechanism for machine tool spindle in non-stop state

Abstract

The present application relates to machine tool equipment technical field, specifically for a kind of feeding mechanism for machine tool spindle not stop state, it includes base, material transmission unit and top material unit, its technical key points are: material transmission unit includes chain type Z direction elevator, hopper, upper support, direct vibrator, feeding channel, scraper, spiral material channel, inclined material channel and Z direction material box, multiple magnetic adsorption blocks for adsorbing workpiece are arranged on the conveying chain of chain type Z direction elevator;The upper surface of base is provided with material hand, the upper surface of material hand is provided with Y direction arc-shaped material receiving groove, top material unit includes sliding assembly, horizontal rotating shaft, excitation rod, Y direction sliding sleeve, reset spring, Y direction push-pull cylinder, the front end of Y direction sliding sleeve points to the Y direction arc-shaped material receiving groove after material receiving and before top material.This application solves the problem that the feeding mechanism of existing automatic line machine tool can only be fed to position under the condition that machine tool spindle stops, significantly improves production efficiency, has the advantages of high efficiency, high stability, high cost performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machine tool equipment, in particular to a feeding mechanism for machine tool spindle under non-stop state. BACKGROUND

[0002] With the rapid development of China's processing and manufacturing industry, the demand for high-speed high-precision machining center is also increasingly obvious. The feeding efficiency of machine tool in automatic line is an important symbol of affecting processing efficiency, but the feeding mechanism of automatic line machine tool is relatively backward, and the feeding mechanism can only be fed to the position under the condition of machine tool spindle stop, thereby the production efficiency of machining center cannot meet the market demand. SUMMARY

[0003] The purpose of the present application is to provide a feeding mechanism for machine tool spindle under non-stop state, which has reasonable structure and reliable use, solves the problem that the feeding mechanism of the existing automatic line machine tool can only be fed to the position under the condition of machine tool spindle stop, significantly improves the production efficiency, and has the advantages of high efficiency, high stability and high cost performance.

[0004] The technical scheme of the present application is:

[0005] A feeding mechanism for machine tool spindle under non-stop state, comprising a base, a material conveying unit and a material lifting unit, and the technical key points are: the material conveying unit comprises a chain type Z-direction lifting machine, a hopper fixed to the lower part of the chain type Z-direction lifting machine, an upper support fixed to the upper rotary side of the chain type Z-direction lifting machine, a straight shock absorber arranged above the upper support, an upper feeding channel arranged at the top of the straight shock absorber, a scraper arranged between the starting section of the upper feeding channel and the conveying chain of the chain type Z-direction lifting machine, a spiral feeding channel connected to the tail of the upper feeding channel, an inclined feeding channel connected to the tail of the spiral feeding channel, and a Z-direction material box connected to the tail of the inclined feeding channel, a plurality of magnetic adsorption blocks for adsorbing workpieces are arranged on the conveying chain of the chain type Z-direction lifting machine; the upper surface of the base is provided with an X-direction track, and the X-direction track is provided with a material hand, the upper surface of the material hand is provided with a flat sealing position corresponding to the lower end of the Z-direction material box and a Y-direction arc-shaped material receiving groove in parallel, and the base is provided with an X-direction push-pull cylinder connected to the rear end of the material hand; the material lifting unit comprises a Y-direction track arranged on the upper surface of the base, a sliding assembly arranged on the Y-direction track, a horizontal rotating shaft arranged on the sliding assembly, an excitation rod arranged at the front end of the horizontal rotating shaft, a Y-direction sliding sleeve wrapped around the front end of the horizontal rotating shaft and the rear part of the excitation rod, a reset spring sleeved on the horizontal rotating shaft, a Y-direction push-pull cylinder arranged on the base and connected with the sliding assembly, and an axle shoulder is arranged on the outer wall of the horizontal rotating shaft, the reset spring is connected between the axle shoulder and the Y-direction sliding sleeve, and the front end of the Y-direction sliding sleeve points to the Y-direction arc-shaped material receiving groove to be lifted after material receiving.

[0006] The feeding mechanism for the machine tool spindle under the non-stop state, the outer wall of the Y direction sliding sleeve is provided with a Y direction long hole, the horizontal rotating shaft is provided with a radial limiting column inserted into the Y direction long hole, and the front part of the Y direction sliding sleeve is a reduced diameter section for inserting the workpiece.

[0007] The feeding mechanism for the machine tool spindle under the non-stop state, the sliding assembly includes a sliding seat arranged on the Y direction track, a bearing seat connected with the side surface of the sliding seat, and the Y direction push-pull cylinder is fixedly connected with the sliding seat, and the rear part of the horizontal rotating shaft is supported in the bearing seat by the bearing group.

[0008] The feeding mechanism for the machine tool spindle under the non-stop state, the groove bottom of the Y direction arc type material receiving groove of the material hand is embedded with a magnetic positioning block.

[0009] The feeding mechanism for the machine tool spindle under the non-stop state, the side wall of the hopper is provided with a material suction port corresponding to the conveying chain of the chain type Z direction elevator.

[0010] The feeding mechanism for the machine tool spindle under the non-stop state, the downward inclination angles of the feeding channel, the spiral feeding channel and the inclined feeding channel are the same, the front part of the upper surface of the feeding channel is provided with a V-shaped supporting groove for receiving the workpiece, and the rear part is provided with a stepped deep groove connected with the V-shaped supporting groove, the cross section size of the lower part of the stepped deep groove is only suitable for the small diameter section of the workpiece to pass in the upright state, and the cross section size of the upper part of the stepped deep groove is only suitable for the large diameter head of the workpiece to pass in the upright state.

[0011] The feeding mechanism for the machine tool spindle under the non-stop state, the spiral feeding channel is provided with a 90-degree spiral groove for transitioning the workpiece from the upright state to the horizontal state, the starting end of the 90-degree spiral groove is communicated with the feeding channel, and the tail end is communicated with the inclined feeding channel.

[0012] The feeding mechanism for the machine tool spindle under the non-stop state, the tail part of the inclined feeding channel is provided with a circular arc section guiding the upper end of the Z direction material box, the side surface of the inclined feeding channel is provided with an inclined rolling groove, and a stop rod assembly is arranged on the opening side of the inclined rolling groove, the inclined rolling groove is inclined downward by 10 degrees, the groove bottom of the inclined rolling groove is inclined upward by 15 degrees, and the lower edge of the opening side of the inclined rolling groove is provided with a positioning surface corresponding to the workpiece.

[0013] The feeding mechanism for the machine tool spindle under the non-stop state, the side surface of the Z direction material box is provided with a Z direction stacking groove, the opening side of the Z direction stacking groove is fixedly provided with a baffle, the cross section size of the Z direction stacking groove is only suitable for the workpiece to pass in the horizontal state, and the lower end of the baffle is fixed on the base.

[0014] The base edge is additionally provided with a connecting seat for connecting with the lateral fixing part of the machine tool spindle, and the center line of the Y-direction sliding sleeve coincides with the center line of the machine tool spindle.

[0015] The present application has the following advantages:

[0016] 1. The material conveying unit continuously sends the workpieces in the hopper to the Z-direction magazine one by one, and the workpieces are orderly stacked from bottom to top in the Z-direction magazine, so that the workpieces can be taken by the material hand in sequence, and the unordered workpieces are automatically changed into ordered workpieces, thereby significantly improving the feeding efficiency.

[0017] 2. The material pushing unit pushes the workpieces in the Y-direction arc-shaped material receiving groove of the material hand into the chuck clamping hole of the machine tool spindle, and then triggers the chuck to clamp the workpieces by using the trigger rod, so that the feeding is completed. After the workpieces are clamped, the horizontal rotating shaft, the sliding sleeve, the trigger rod and the workpieces rotate with the machine tool spindle, and the machine tool spindle does not need to stop rotating, and then the material pushing unit is reset. The feeding mechanism of the present application does not stop rotating with the machine tool spindle, thereby significantly improving the feeding efficiency and saving the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be described in detail with reference to the accompanying drawings.

[0019] Figure 1 is the overall structure perspective view of the present application;

[0020] Figure 2 is the plane structure schematic view of the present application;

[0021] Figure 3 is the right view of Figure 2 ;

[0022] Figure 4 is the top view of Figure 2 ;

[0023] Figure 5 is the combined schematic view of the spiral material channel and the inclined material channel of the present application;

[0024] Figure 6 is the assembly schematic view of the base and the peripheral components of the present application;

[0025] Figure 7 is the assembly schematic view of the top of the chain type Z-direction lifting machine and the peripheral components of the present application;

[0026] Figure 8 is the assembly schematic view of the upper material channel, the spiral material channel, the inclined material channel, the Z-direction magazine and the upper part of the base of the present application;

[0027] Figure 9 is the assembly schematic view of the scraper, the upper material channel, the spiral material channel, the inclined material channel, the blocking rod and the peripheral components of the present application;

[0028] Figure 10 is the schematic diagram of the arrangement of the material hand and the material ejecting unit on the base of the present application;

[0029] Figure 11 is the schematic diagram of the arrangement of the material hand and the material ejecting unit on the base of the present application; Figure 10 is the bottom view of the present application;

[0030] Figure 12 is the sectional view of A-A in the present application; Figure 10

[0031] Figure 13 is the right view of the present application; Figure 11

[0032] Figure 14 is the schematic diagram of the arrangement of the workpiece in the feeding channel and the spiral feeding channel;

[0033] Figure 15 is the schematic diagram of the arrangement of the workpiece in the feeding channel and the spiral feeding channel;

[0034] In the figure: 1. hopper, 2. chain type Z direction lifting machine, 3. upper support, 4. straight vibrator, 5. feeding channel, 6. spiral feeding channel, 7. inclined feeding channel, 8. Z direction material box, 9. Y direction push-pull cylinder, 10. X direction push-pull cylinder, 11. base, 12. connecting seat, 13. bearing seat, 14. conveying chain, 15. magnetic adsorption block, 16. scraper, 17. baffle, 18. V-shaped supporting groove, 19. stepped deep groove, 20. 90 degree spiral groove, 21. stop rod, 22. fixing seat, 23. material hand, 24. circular arc segment, 25. sliding assembly, 26. Y direction track, 27. Y direction arc type material receiving groove, 28. workpiece, 29. reset spring, 30. Y direction sliding sleeve, 31. excitation rod, 32. magnetic positioning block, 33. X direction track, 34. radial limiting column, 35. Y direction long hole, 36. bearing set, 37. horizontal rotating shaft. DETAILED DESCRIPTION

[0035] The present application is described in detail according to the accompanying drawings.

[0036] As shown in the figure, the feeding mechanism for the non-stop rotation state of the main shaft of the machine tool comprises a base 11, a material conveying unit and a material ejecting unit. In the embodiment, the workpiece is stepped and comprises a large diameter head and a small diameter segment. The center of gravity of the workpiece is at the intersection of the small diameter segment and the large diameter head, and the large diameter head is a hollow structure. Figures 1-15

[0037] ​​​The material conveying unit comprises a chain type Z-direction elevator 2, a hopper 1 fixed to the lower part of the chain type Z-direction elevator 2, an upper support 3 fixed to the upper part of the chain type Z-direction elevator 2 on the rotating side, a straight vibrator 4 arranged above the upper support 3, an upper material channel 5 arranged on the top of the straight vibrator 4, a scraper 16 arranged between the starting section of the upper material channel 5 and the conveying chain 14 of the chain type Z-direction elevator 2, a spiral material channel 6 connected to the tail of the upper material channel 5, an inclined material channel 7 connected to the tail of the spiral material channel 6, and a Z-direction material box 8 connected to the tail of the inclined material channel 7. A plurality of magnetic adsorption blocks 15 for adsorbing workpieces are arranged on the conveying chain 14 of the chain type Z-direction elevator 2 at intervals. The side wall of the hopper 1 is provided with a material suction port corresponding to the conveying chain 14 of the chain type Z-direction elevator 2. The workpiece is adsorbed by the magnetic adsorption block 15 at the material suction port and rises along the conveying chain 14 of the chain type Z-direction elevator.

[0038] In the embodiment, the downward inclination angles of the upper material channel 5, the spiral material channel 6 and the inclined material channel 7 are the same. The front part of the upper surface of the upper material channel 5 is provided with a V-shaped supporting groove 18 for receiving the workpiece, and the rear part is provided with a stepped deep groove 19 connected to the V-shaped supporting groove 18. The cross-sectional dimension of the lower part of the stepped deep groove 19 is only suitable for the small-diameter section of one workpiece to pass in the upright state, and the cross-sectional dimension of the lower part of the stepped deep groove 19 is only suitable for the large-diameter head of one workpiece to pass in the upright state. The spiral material channel 6 is provided with a 90-degree spiral groove 20 for transitioning the workpiece from the upright state to the horizontal state. The starting end of the 90-degree spiral groove 20 is communicated with the stepped deep groove 19 of the upper material channel 5, and the tail end is communicated with the inclined material channel 7.

[0039] The tail of the inclined material channel 7 is provided with a circular arc section 24 guiding the upper end of the Z-direction material box 8. The side surface of the inclined material channel 7 is provided with an inclined rolling groove and a stop rod assembly blocking the opening side of the inclined rolling groove. The stop rod assembly is composed of a stop rod 21 extending along the opening side of the inclined rolling groove and a plurality of fixing seats 22 connected to the stop rod 21 and the outer wall of the inclined material channel 7. The front part of the stop rod 21 of the stop rod assembly extends to the rear section of the 90-degree spiral groove 20 to avoid the workpiece from falling out when it is turned over in the spiral material channel. The inclined rolling groove is inclined downward by 10 degrees, and the bottom of the inclined rolling groove is inclined upward by 15 degrees. The opening side of the inclined rolling groove is provided with a stepped positioning surface corresponding to the workpiece. The small-diameter section of the workpiece rolls along the bottom surface of the inclined rolling groove, and the large-diameter head rolls along the stepped positioning surface. The side surface of the Z-direction material box 8 is provided with a Z-direction stacking groove. A baffle 17 is fixed to the opening side of the Z-direction stacking groove. The cross-sectional dimension of the Z-direction stacking groove is only suitable for one workpiece to pass in the horizontal state. The lower end of the baffle 17 is fixed to the base 11.

[0040] The upper surface of the base 11 is provided with an X-direction track 33, and the X-direction track 33 is provided with a material hand 23. The upper surface of the material hand 23 is provided with a flat sealing position corresponding to the lower end of the Z-direction material magazine 8 and a Y-direction arc-shaped material receiving groove 27. The base 11 is provided with an X-direction push-pull cylinder 10 connected with the rear end of the material hand 23. In the figure, the X-direction push-pull cylinder 10 is disconnected with the material hand 23, and needs to be connected together in use. In the embodiment, the groove bottom of the Y-direction arc-shaped material receiving groove 27 of the material hand 23 is embedded with a magnetic positioning block 32.

[0041] The top material unit includes a Y-direction track 26 provided on the upper surface of the base 11, a sliding assembly 25 provided on the Y-direction track 26, a horizontal rotating shaft 37 provided on the sliding assembly 25, an exciting rod 31 provided at the front end of the horizontal rotating shaft 37, a Y-direction sliding sleeve 30 wrapped around the front end of the horizontal rotating shaft 37 and the rear part of the exciting rod 31, a reset spring 29 sleeved on the horizontal rotating shaft 37, and a Y-direction push-pull cylinder 9 provided on the base 11 and connected with the sliding assembly 25. The outer wall of the horizontal rotating shaft 37 is provided with a shaft shoulder, the reset spring 29 is connected between the shaft shoulder and the Y-direction sliding sleeve 30, and the front end of the Y-direction sliding sleeve 30 points to the Y-direction arc-shaped material receiving groove 27 to be topped after material receiving.

[0042] In the embodiment, the sliding assembly includes a sliding seat provided on the Y-direction track 26 and a bearing seat 13 connected with the side surface of the sliding seat. The Y-direction push-pull cylinder 9 is fixedly connected with the sliding seat, and the rear part of the horizontal rotating shaft 37 is supported in the bearing seat 13 by means of a bearing group 36. The outer wall of the Y-direction sliding sleeve 30 is provided with a Y-direction long hole 35, the horizontal rotating shaft 37 is provided with a radial limiting column 34 inserted into the Y-direction long hole 35, and the front part of the Y-direction sliding sleeve 30 is a reduced diameter section for inserting a large diameter head part of a workpiece. The edge of the base 11 is further provided with a connecting seat 12 for connecting with a side fixing part of a machine tool main shaft, and the center line of the Y-direction sliding sleeve 30 coincides with the center line of the machine tool main shaft.

[0043] Working principle:

[0044] 1. Fill a plurality of workpieces 28 in the hopper 1, start the chain type Z-direction lifting machine 2, and the plurality of magnetic adsorption blocks 15 arranged at intervals on the transmission chain 14 of the chain type Z-direction lifting machine 2 adsorb the workpieces 28 located at the material suction port in the hopper 1 respectively, and drive the workpieces 28 to go upward.

[0045] 2. After being driven to the top of the chain-type Z-axis elevator 2 and flipped, the workpiece 28 is scraped off by the scraper 16 and separated from the conveyor chain 14. It is then guided by the scraper 16 to the feed channel 5. The feed channel 5 vibrates under the action of the direct vibrator 4. Each workpiece 28 falls onto the V-shaped support groove 18 of the feed channel 5 under its own center of gravity and vibration. At the end of the V-shaped support groove 18, the large diameter head of the workpiece is at the bottom and the small diameter section is at the top. Then, the center of gravity deflects, causing the small diameter section to flip downward and enter the lower part of the stepped deep groove 19. The large diameter head is restricted to the upper part of the stepped deep groove 19. Maintaining this state, each workpiece 28 continues to slide downward along the stepped deep groove 19 in sequence. Then, it is transformed into a horizontal state through the 90-degree spiral groove 20 of the spiral feed channel 6, and then enters the inclined rolling groove of the inclined feed channel 7. Finally, it rolls towards the Z-axis material box 8 and falls down along the Z-axis stacking trough.

[0046] 3. During material receiving, the Y-axis arc-shaped receiving groove 27 of the material handler 23 is located at the lower port of the Z-axis material box 8. A workpiece 28 falls into the Y-axis arc-shaped receiving groove 27 and is positioned by the magnetic positioning block 32. The X-axis push-pull cylinder 10 is activated to push the material handler 23 forward along the X-axis track 33 until it is positioned between the machine tool spindle and the Y-axis sliding sleeve 30 of the top material unit.

[0047] 4. Activate the Y-axis push-pull cylinder 9 to push the slide, bearing housing 13, horizontal rotating shaft 37, Y-axis sliding sleeve 30, and excitation rod 31 to move along the Y-axis track 26 towards the material hand 23. The Y-axis sliding sleeve 30 is inserted into the large-diameter head of the positioned workpiece 28 and pushes the workpiece 28 to the spindle chuck at the front end of the machine tool spindle.

[0048] 5. The excitation rod 31 actuates the spindle chuck to clamp the workpiece 28, and then the ejector unit retracts and resets. Before disengaging from the machine tool spindle, the bearing housing 13 and bearing assembly 36 cause the horizontal rotating shaft 37, the Y-axis sliding sleeve 30, and the excitation rod 31 to rotate synchronously with the machine tool spindle, achieving non-stop feeding.

[0049] 6. When processing the previous workpiece, the material handler 23 returns to the receiving position under the pull of the X-direction push-pull cylinder 10, and the Y-direction arc-shaped receiving groove 27 of the material handler 23 returns to the lower port of the Z-direction material box 8 to receive the next workpiece 28. Repeat the above steps 3-5 to achieve uninterrupted material feeding and processing operation.

[0050] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A feeding mechanism for use when the machine tool spindle is not rotating, comprising a base, a material transfer unit, and a material ejection unit, characterized in that: The material transfer unit includes a chain-type Z-axis elevator, a hopper fixed to the lower part of the chain-type Z-axis elevator, an upper support fixed to the upper rotating side of the chain-type Z-axis elevator, a vertical vibrator located above the upper support, a feeding channel located on top of the vertical vibrator, a scraper located between the starting section of the feeding channel and the conveyor chain of the chain-type Z-axis elevator, a spiral feeding channel connected to the tail of the feeding channel, an inclined feeding channel connected to the tail of the spiral feeding channel, and a Z-axis material box connected to the tail of the inclined feeding channel. Multiple magnetic adsorption blocks for adsorbing workpieces are spaced apart on the conveyor chain of the chain-type Z-axis elevator. An X-axis track is provided on the upper surface of the base, and a material handle is provided on the X-axis track. The upper surface of the material handle is provided with parallel... Corresponding to the planar sealing position at the lower port of the Z-direction hopper and the Y-direction arc-shaped receiving groove, the base is provided with an X-direction push-pull cylinder connected to the rear end of the material hand; the material ejection unit includes a Y-direction track on the upper surface of the base, a sliding component on the Y-direction track, a horizontal rotating shaft on the sliding component, an excitation rod at the front end of the horizontal rotating shaft, a Y-direction sliding sleeve surrounding the front end of the horizontal rotating shaft and the rear end of the excitation rod, a return spring on the horizontal rotating shaft, and a Y-direction push-pull cylinder on the base and connected to the sliding component. The outer wall of the horizontal rotating shaft is provided with a shoulder, and the return spring is connected between the shoulder and the Y-direction sliding sleeve. The front end of the Y-direction sliding sleeve points to the Y-direction arc-shaped receiving groove to be ejected after receiving the material.

2. The feeding mechanism for a machine tool spindle in a continuous rotation state according to claim 1, characterized in that: The outer wall of the Y-direction sliding sleeve is provided with a Y-direction elongated hole, and the horizontal rotating shaft is provided with a radial limiting post that is inserted into the Y-direction elongated hole. The front part of the Y-direction sliding sleeve is a reduced diameter section for inserting into the workpiece.

3. The feeding mechanism for a machine tool spindle in a continuous rotation state according to claim 1, characterized in that: The sliding assembly includes a slide block on the Y-axis track and a bearing seat connected to the side of the slide block. The Y-axis push-pull cylinder is fixedly connected to the slide block, and the rear of the horizontal rotating shaft is supported in the bearing seat by a bearing assembly.

4. The feeding mechanism for a machine tool spindle in a continuous rotation state according to claim 1, characterized in that: The bottom of the Y-shaped arc-shaped receiving groove of the material hand is fitted with a magnetic positioning block.

5. The feeding mechanism for a machine tool spindle in a continuous rotation state according to claim 1, characterized in that: The side wall of the hopper is provided with a suction port for the conveyor chain of the corresponding chain-type Z-axis elevator.

6. The feeding mechanism for a machine tool spindle in a continuous rotation state according to claim 1, characterized in that: The feeding channel and the spiral feeding channel have the same downward inclination angle as the inclined feeding channel. The upper surface of the feeding channel is provided with a V-shaped support groove at the front for receiving workpieces, and a stepped deep groove connected to the V-shaped support groove at the rear. The lower cross-sectional dimension of the stepped deep groove is only enough for the small diameter section of a workpiece to pass through in an upright state, and the upper cross-sectional dimension of the stepped deep groove is only enough for the large diameter head of the workpiece to pass through in an upright state.

7. The feeding mechanism for a machine tool spindle in a continuous rotation state according to claim 1, characterized in that: The spiral feed channel is provided with a 90-degree spiral groove that transitions the workpiece from an upright state to a horizontal state. The starting end of the 90-degree spiral groove is connected to the feed channel, and the tail end is connected to the inclined feed channel.

8. The feeding mechanism for a machine tool spindle in a continuous rotation state according to claim 1, characterized in that: The tail end of the inclined material channel is provided with an arc section for guiding the upper end of the Z-direction material box. The side of the inclined material channel is provided with an inclined rolling groove and a stop rod assembly that blocks the opening side of the inclined rolling groove. The inclined rolling groove is inclined downward at 10 degrees and the bottom elevation angle of the inclined rolling groove is 15 degrees. The lower edge of the opening side of the inclined rolling groove is provided with a positioning surface corresponding to the workpiece.

9. The feeding mechanism for a machine tool spindle in a continuous rotation state according to claim 1, characterized in that: The Z-direction material box has a Z-direction stacking groove on its side. A baffle is fixed to the opening side of the Z-direction stacking groove. The cross-sectional size of the Z-direction stacking groove is only enough for one workpiece to pass through in a horizontal state. The lower end of the baffle is fixed to the base.

10. The feeding mechanism for a machine tool spindle in a continuous rotation state according to claim 1, characterized in that: The base edge is further provided with a connecting seat for connecting with the side fixing part of the machine tool spindle, and the center line of the Y-axis sliding sleeve coincides with the center line of the machine tool spindle.

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