Drilling and tapping spindle with airtight protection function

Abstract

The drilling and tapping spindle with the airtight protection function comprises a sleeve, a mandrel, a first bearing, a second bearing and a nut, a circular truncated cone part is arranged at the top end of the sleeve, a water throwing ring is arranged on the mandrel in a sleeved mode, a rear air seat is fixedly connected to the top end of the sleeve, and a circular truncated cone type cavity is formed in the bottom of the rear air seat. A first air cavity is formed among the circular-truncated-cone-shaped cavity, the water throwing ring and the circular truncated cone part, a first air curtain channel is formed between the inner ring of the rear air seat and the outer wall of the mandrel, and an air outlet channel is formed in the sleeve; the mandrel is sleeved with an annular spraying front cover, an annular containing groove is formed in the bottom of the annular spraying front cover, an air curtain ring is arranged in the annular containing groove, an air inlet channel is formed in the sleeve, the annular spraying front cover is provided with a first air channel, an annular air groove is formed in the top of the air curtain ring, and vent grooves are distributed in the top of the air curtain ring. A second air curtain channel is formed among the annular spraying front cover, the inner ring of the air curtain ring and the outer wall of the mandrel, the service life of the spindle can be prolonged, the use amount of high-pressure gas is reduced, and energy conservation and environment protection are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling and tapping spindles, in particular to a drilling and tapping spindle with an airtight protection function. Background Art

[0002] A drilling and tapping spindle is a spindle used on a numerically controlled machine tool to drive a drilling and tapping tool to rotate for machining a workpiece. The drilling and tapping spindle mainly consists of a sleeve and a core shaft. The core shaft and the sleeve are connected by bearings to allow the core shaft to rotate in the sleeve. When the machine tool processes the workpiece, metal chips and waste water will be generated. When the waste water with metal chips enters the inside of the bearings, it will exacerbate the wear of the bearings, resulting in unstable operation of the spindle and affecting the service life of the spindle. Therefore, it is necessary to seal the spindle bearings well. For the existing spindles, the sealing effect of their bearings is not ideal enough, resulting in a short service life of the spindles and a high maintenance frequency. Summary of the Utility Model

[0003] The problem to be solved by the utility model is to provide a drilling and tapping spindle with an airtight protection function, improve the sealing protection of the bearings, increase the service life of the spindle, and reduce the maintenance frequency of the spindle.

[0004] To solve the above technical problems, a drilling and tapping spindle with an airtight protection function provided by the present utility model is adopted, which includes a sleeve, a mandrel arranged in the sleeve, a first bearing and a second bearing sleeved on the mandrel. An inner middle spacer ring is sleeved on the mandrel and abuts between the inner rings of the first bearing and the second bearing. An outer middle spacer ring sleeved on the inner middle spacer ring is fixedly connected to the inner circle of the sleeve. A rear spacer ring abutting against the top of the inner ring of the first bearing is sleeved on the mandrel. A nut abutting against the top of the rear spacer ring is sleeved on the mandrel. A frustum-shaped part sleeved on the nut is arranged at the top end of the sleeve. A water throwing ring fixedly connected to the top of the nut is sleeved on the mandrel. Longitudinal grooves are evenly distributed on the side wall of the nut. A rear air seat sleeved on the mandrel is fixedly connected to the top end of the sleeve. A frustum-shaped cavity is arranged at the bottom of the rear air seat. A first air cavity is formed between the frustum-shaped cavity, the water throwing ring and the frustum-shaped part. A first air curtain channel is formed between the inner circle of the rear air seat and the outer wall of the mandrel. An air outlet channel communicated with the first air cavity is arranged on the sleeve. A ring-shaped spray front cover fixedly connected to the bottom end of the sleeve is sleeved on the mandrel. An annular accommodating groove is arranged on the inner peripheral edge of the bottom of the ring-shaped spray front cover. An air curtain ring sleeved on the mandrel is arranged in the annular accommodating groove. An air inlet channel is arranged on the sleeve. A first air channel communicated with the air inlet channel is arranged on the ring-shaped spray front cover. An annular air groove communicated with the first air channel is arranged on the outer peripheral edge of the top of the air curtain ring. Venting grooves are arranged in an annular array on the top of the air curtain ring. A second air curtain channel is formed among the inner circles of the ring-shaped spray front cover, the air curtain ring and the outer wall of the mandrel. The two ends of the venting grooves are respectively communicated with the annular air groove and the second air curtain channel. An inner labyrinth ring abutting against the bottom of the inner ring of the second bearing is sleeved on the mandrel. An outer labyrinth ring abutting between the outer ring of the second bearing and the top of the ring-shaped spray front cover is sleeved on the inner labyrinth ring. A first labyrinth structure is formed between the outer labyrinth ring and the inner labyrinth ring. A front water blocking ring fixedly connected to the mandrel is sleeved on the bottom end of the mandrel. A second labyrinth structure is formed between the air curtain ring and the front water blocking ring.

[0005] Preferably, nozzle mounting holes are evenly distributed on the bottom of the ring-shaped spray front cover. Nozzles are installed on the nozzle mounting holes. A water inlet channel communicated with the nozzle mounting holes is arranged on the sleeve.

[0006] Preferably, a plurality of first annular grooves are arranged side by side on the inner ring wall of the rear air seat. A first diversion inclined surface is arranged on the first annular grooves. A plurality of second annular grooves are arranged side by side on the peripheral edge of the side wall of the mandrel. A second diversion inclined surface is arranged on the second annular grooves.

[0007] The beneficial effects of the present utility model are as follows: The present utility model provides a drilling and tapping spindle with an airtight protection function. The air inlet passage is connected to the air pipe, and air is supplied to the air inlet passage through the air pipe. High-pressure air enters the second air curtain passage through the air inlet passage, the first air passage, the annular air groove, and the ventilation groove. An air curtain effect is formed on the second air curtain passage to prevent waste liquid from entering through the front end of the spindle. Most of the air will be discharged from the second air curtain passage through the second labyrinth structure, and a small part of the air will pass through the second air curtain passage and successively pass through the first labyrinth structure, the inside of the second bearing, the gap between the middle inner spacer ring and the middle outer spacer ring, the inside of the first bearing, the gap between the rear spacer ring and the sleeve, the longitudinal groove, the gap between the water throwing ring and the conical part, and then enter the first air chamber and the first air curtain passage. The air will be discharged outside the first air chamber through the air outlet passage. An air curtain effect is formed on the first air curtain passage to prevent machining waste liquid from entering the first air chamber. When the mandrel rotates, it will drive the water throwing ring to rotate synchronously. The waste liquid attached to the water throwing ring will be thrown off under the action of centrifugal force and discharged outside the first air chamber through the first air curtain passage. The first labyrinth structure and the second labyrinth structure can intercept the waste liquid, and the high-pressure gas can pass through, preventing the waste liquid from entering through the rear end of the spindle, preventing the waste liquid from entering the inside of the bearing, reducing the wear of the bearing, increasing the service life of the bearing, reducing the maintenance frequency of the spindle, ensuring the stable operation of the spindle, reducing the consumption of compressed air, and saving energy and protecting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 Illustrates the external structure schematic diagram of the present utility model.

[0009] Figure 2 Illustrates the cross-sectional view of the first angle of the present utility model.

[0010] Figure 3 Illustrates the cross-sectional view of the second angle of the present utility model.

[0011] Figure 4 Illustrates the cross-sectional view of the third angle of the present utility model.

[0012] Figure 5 Illustrates the present utility model Figure 2 The partial enlarged structure schematic diagram of part A in it.

[0013] Figure 6 Illustrates the present utility model Figure 4 The partial enlarged structure schematic diagram of part B in it.

[0014] Description of the reference numerals in the drawings: sleeve 1, frustum portion 10, air outlet passage 11, air inlet passage 12, inner middle partition ring 13, outer middle partition ring 14, rear partition ring 15, inner labyrinth ring 16, outer labyrinth ring 17, first labyrinth structure 18, mandrel 2, front water retaining ring 20, second labyrinth structure 21, first bearing 3, second bearing 4, nut 5, longitudinal groove 50, water throwing ring 6, rear air seat 7, frustum cavity body 70, first air cavity 71, first air curtain passage 72, first annular groove 73, first guide slope 730, second annular groove 74, second guide slope 740, annular spray front cover 8, annular accommodation groove 80, first air passage 81, annular air groove 82, ventilation groove 83, second air curtain passage 84, nozzle 85, water inlet passage 86, air curtain ring 9. Specific embodiments

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Apparently, the described embodiments are some, but not all, of the embodiments of the present disclosure.

[0016] All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0017] Refer to Figures 1-6 。

[0018] The utility model provides a drilling and tapping spindle with an airtight protection function, which comprises a sleeve 1, a mandrel 2 arranged in the sleeve 1, a first bearing 3 and a second bearing 4 sleeved on the mandrel 2. An inner middle spacer ring 13 is sleeved on the mandrel 2 and abuts between the inner rings of the first bearing 3 and the second bearing 4. An outer middle spacer ring 14 sleeved on the inner middle spacer ring 13 is fixedly connected to the inner ring of the sleeve 1. A rear spacer ring 15 is sleeved on the mandrel 2 and abuts against the top of the inner ring of the first bearing 3. A nut 5 is sleeved on the mandrel 2 and abuts against the top of the rear spacer ring 15. A frustum part 10 sleeved on the nut 5 is arranged at the top end of the sleeve 1. A water throwing ring 6 fixedly connected to the top of the nut 5 is sleeved on the mandrel 2. Longitudinal grooves 50 are uniformly distributed on the side wall of the nut 5. A rear air seat 7 sleeved on the mandrel 2 is fixedly connected to the top end of the sleeve 1. A frustum cavity 70 is arranged at the bottom of the rear air seat 7. A first air cavity 71 is formed between the frustum cavity 70, the water throwing ring 6 and the frustum part 10. A first air curtain channel 72 is formed between the inner ring of the rear air seat 7 and the outer wall of the mandrel 2. An air outlet channel 11 communicated with the first air cavity 71 is arranged on the sleeve 1. A ring spray front cover 8 fixedly connected to the bottom end of the sleeve 1 is sleeved on the mandrel 2. An annular accommodation groove 80 is arranged on the inner peripheral edge of the bottom of the ring spray front cover 8. An air curtain ring 9 sleeved on the mandrel 2 is arranged in the annular accommodation groove 80. An air inlet channel 12 is arranged on the sleeve 1. A first air channel 81 communicated with the air inlet channel 12 is arranged on the ring spray front cover 8. An annular air groove 82 communicated with the first air channel 81 is arranged on the outer peripheral edge of the top of the air curtain ring 9. Ventilation grooves 83 are annularly and arrayedly distributed on the top of the air curtain ring 9. A second air curtain channel 84 is formed between the inner rings of the ring spray front cover 8 and the air curtain ring 9 and the outer wall of the mandrel 2. The two ends of the ventilation grooves 83 are respectively communicated with the annular air groove 82 and the second air curtain channel 84. An inner labyrinth ring 16 abutting against the bottom of the inner ring of the second bearing 4 is sleeved on the mandrel 2. An outer labyrinth ring 17 abutting between the outer ring of the second bearing 4 and the top of the ring spray front cover 8 is sleeved on the inner labyrinth ring 16. A first labyrinth structure 18 is formed between the outer labyrinth ring 17 and the inner labyrinth ring 16. A front water blocking ring 20 fixedly connected to the mandrel 2 is sleeved on the bottom end of the mandrel 2. A second labyrinth structure 21 is formed between the air curtain ring 9 and the front water blocking ring 20.

[0019] The specific working principle is as follows: Connect the air inlet duct 12 with the air pipe, and supply air to the air inlet duct 12 through the air pipe. High-pressure air enters the second air curtain duct 84 through the air inlet duct 12, the first air duct 81, the annular air groove 82, and the ventilation groove 83. An air curtain effect is formed on the second air curtain duct 84 to prevent waste liquid from entering through the front end of the main shaft. Most of the air will be discharged from the second air curtain duct 84 through the second labyrinth structure 21. A small part of the air will pass through the second air curtain duct 84 and successively pass through the first labyrinth structure 18, the inside of the second bearing 4, the gap between the middle inner spacer ring and the middle outer spacer ring, the inside of the first bearing, the gap between the rear spacer ring 15 and the sleeve 1, the longitudinal groove 50, the gap between the water throwing ring 6 and the frustum part 10, and then enter the first air cavity 71 and the first air curtain duct 72. The air will be discharged from the first air cavity 71 through the air outlet duct 11. An air curtain effect is formed on the first air curtain duct 72 to prevent machining waste liquid from entering the first air cavity 71. When the mandrel 2 rotates, it will drive the water throwing ring 6 to rotate synchronously. The waste liquid attached to the water throwing ring 6 will be thrown off under the action of centrifugal force and discharged from the first air cavity 71 through the first air curtain duct 72. The first labyrinth structure 18 and the second labyrinth structure 21 can intercept the waste liquid, and the high-pressure gas can pass through, preventing the waste liquid from entering through the rear end of the main shaft, preventing the waste liquid from entering the bearing interior, reducing the wear of the bearing, increasing the service life of the bearing, reducing the maintenance frequency of the main shaft, ensuring the stable operation of the main shaft, reducing the consumption of compressed gas, and saving energy and protecting the environment.

[0020] Based on the above embodiments, nozzle mounting holes are evenly distributed at the bottom of the annular spray front cover 8. Nozzles 85 are mounted on the nozzle mounting holes. A water inlet duct 86 communicating with the nozzle mounting holes is provided on the sleeve 1. Install the tool on the main shaft, connect the water inlet duct 86 with a water pipe, and supply water to the water inlet duct 86 through the water pipe, enabling the nozzles 85 to spray water onto the workpiece to form an annular water spray effect.

[0021] Based on the above embodiments, a number of first annular grooves 73 are arranged in parallel on the inner peripheral wall of the rear air seat 7. First guide inclined surfaces 730 are provided on the first annular grooves 73. A number of second annular grooves 74 are arranged in parallel on the circumferential edge of the side wall of the mandrel 2. Second guide inclined surfaces 740 are provided on the second annular grooves 74. When the mandrel 2 rotates, the waste water attached to the first guide inclined surfaces 730 and the second guide inclined surfaces 740 will be thrown outward under the action of centrifugal force, guiding the flow of the waste liquid.

[0022] The above embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary engineering and technical personnel in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A drilling and tapping spindle with airtight protection function, comprising a sleeve, a mandrel arranged in the sleeve, a first bearing and a second bearing sleeved on the mandrel, characterized in that: The spindle is sleeved with an inner middle spacer ring abutting between the inner ring of the first bearing and the inner ring of the second bearing, the inner ring of the sleeve is fixedly connected with an outer middle spacer ring sleeved on the inner middle spacer ring, the spindle is sleeved with a rear spacer ring abutting against the top of the inner ring of the first bearing, the spindle is sleeved with a nut abutting against the top of the rear spacer ring, the top of the sleeve is provided with a truncated cone portion sleeved on the nut, the spindle is sleeved with a water-slinging ring fixedly connected to the top of the nut, the side wall of the nut is evenly distributed with longitudinal grooves, the top of the sleeve is fixedly connected with a rear air seat sleeved on the spindle, the bottom of the rear air seat is provided with a truncated cone-shaped cavity, a first air cavity is formed between the truncated cone-shaped cavity, the water-slinging ring and the truncated cone portion, a first air curtain channel is formed between the inner ring of the rear air seat and the outer wall of the spindle, and an air outlet channel connected to the first air cavity is provided on the sleeve; the spindle is sleeved with a ring spray front cover fixedly connected to the bottom end of the sleeve, the An annular receiving groove is arranged on the inner peripheral edge of the bottom of the annular spray front cover, an air curtain ring sleeved on the core shaft is arranged in the annular receiving groove, an air inlet is arranged on the sleeve, a first air duct connected with the air inlet is arranged on the annular spray front cover, an annular air groove connected with the first air duct is arranged on the top outer peripheral edge of the air curtain ring, ventilation grooves are distributed in an annular array on the top of the air curtain ring, a second air curtain duct is formed between the annular spray front cover, the inner ring of the air curtain ring and the outer wall of the core shaft, and the ventilation grooves are arranged on the top of the air curtain ring. The two ends of the air groove are respectively connected with the annular air groove and the second air curtain channel, the core shaft is sleeved with an inner labyrinth ring abutting against the bottom of the inner ring of the second bearing, the inner labyrinth ring is sleeved with an outer labyrinth ring abutting between the outer ring of the second bearing and the top of the ring spray front cover, a first labyrinth structure is formed between the outer labyrinth ring and the inner labyrinth ring, the bottom end of the core shaft is sleeved with a front water retaining ring fixedly connected to the core shaft, a second labyrinth structure is formed between the air curtain ring and the front water retaining ring.

2. The drilling and tapping spindle with airtight protection function according to claim 1, characterized in that: The bottom of the ring spray front cover is evenly distributed with nozzle mounting holes, the nozzle mounting holes are mounted with nozzles, and the sleeve is provided with a water inlet channel connected with the nozzle mounting holes.

3. The drilling and tapping spindle with airtight protection function according to claim 2, characterized in that: A plurality of first annular grooves are arranged in parallel on the inner ring wall of the rear air seat, and a first guide slope is arranged on the first annular groove; a plurality of second annular grooves are arranged in parallel on the peripheral edge of the side wall of the core shaft, and a second guide slope is arranged on the second annular groove.

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