阅读说明：本技术 一种机床中空内冷丝杠固定结构 (Machine tool hollow inner-cooling lead screw fixing structure ) 是由 刘雪鹏 王磊 王媛媛 刘平 高伟宏 于 2021-07-20 设计创作，主要内容包括：本发明公开了一种机床中空内冷丝杠固定结构,包括有电机座和中空丝杠,在所述的中空丝杠周向上设有出水口,所述的中空丝杠出油端伸入电机座内,在所述的电机座内设有套设在中空丝杠上的尾端轴承,所述的尾端轴承位于中空丝杠的出水口前端,在所述的中空丝杠上螺纹连接有压紧尾端轴承内圈的锁紧螺母,在所述的电机座上连接有压紧尾端轴承外圈的尾端轴承压盖,在所述的电机座上还连接有出水法兰,在所述的出水法兰上设有与出水口连通的出口,在所述的出水法兰和中空丝杠之间设有一对置于出水口两侧的密封件；采用该中空内冷丝杠固定结构,将尾端轴承置于出水口前端,冷却液循环时经过尾端轴承能够将大量热量带走,具有更好的降温效果。(The invention discloses a hollow internal cooling lead screw fixing structure of a machine tool, which comprises a motor base and a hollow lead screw, wherein a water outlet is arranged on the circumference of the hollow lead screw, the oil outlet end of the hollow lead screw extends into the motor base, a tail end bearing sleeved on the hollow lead screw is arranged in the motor base, the tail end bearing is positioned at the front end of the water outlet of the hollow lead screw, a locking nut for pressing the inner ring of the tail end bearing is connected on the hollow lead screw in a threaded manner, a tail end bearing pressing cover for pressing the outer ring of the tail end bearing is connected on the motor base, a water outlet flange is also connected on the motor base, an outlet communicated with the water outlet is arranged on the water outlet flange, and a pair of sealing pieces arranged at two sides of the water outlet is arranged between the water outlet flange and the hollow lead screw; by adopting the hollow internal cooling lead screw fixing structure, the tail end bearing is arranged at the front end of the water outlet, and a large amount of heat can be taken away through the tail end bearing when cooling liquid circulates, so that the hollow internal cooling lead screw fixing structure has a better cooling effect.)

1. The utility model provides a cold lead screw fixed knot constructs in lathe cavity, is including motor cabinet (1) and hollow lead screw (2) cavity lead screw (2) circumference on be equipped with delivery port (3), cavity lead screw (2) produce oil the end and stretch into in motor cabinet (1), its characterized in that: motor cabinet (1) in be equipped with tail end bearing (4) that the cover was established on cavity lead screw (2), tail end bearing (4) be located delivery port (3) front end of cavity lead screw (2) on cavity lead screw (2) threaded connection have lock nut (5) that compress tightly tail end bearing (4) inner circle motor cabinet (1) on be connected with tail end bearing gland (7) that compress tightly tail end bearing (4) outer lane motor cabinet (1) on still be connected with water outlet flange (8) on be equipped with export (9) with delivery port (3) intercommunication water outlet flange (8) and cavity lead screw (2) between be equipped with a pair of sealing member (10) of arranging delivery port (3) both sides in.

2. The hollow internal cooling screw fixing structure of the machine tool according to claim 1, characterized in that: a tail end space ring (11) capable of tightly supporting the inner ring of the tail end bearing (4) is arranged between the tail end bearing (4) and the locking nut (5); the sealing element (10) is a rotary oil seal; a sealing ring (12) is arranged at one end of the motor base (1) far away from the motor; the sealing ring (12) is a rotary oil seal.

3. The hollow internal cooling screw fixing structure of the machine tool according to claim 1 or 2, characterized in that: cavity lead screw (2) water inlet one end be equipped with bearing frame (13) cavity lead screw (2) go up the cover and be equipped with head bearing (14) of arranging in bearing frame (13) on install head bearing gland (15), head bearing (14) outer lane both ends face push up respectively and lean on head bearing gland (15) and bearing frame (13) head bearing (14) and cavity lead screw (2) shaft shoulder between be equipped with the match grinding pad (16) of leaning on in head bearing (14) inner circle hollow lead screw (2) water inlet one end threaded connection have can push up tight nut (17) of tight head bearing (14) inner circle bearing frame (13) on be connected with into water flange (18) intake flange (18) on be connected with into water end cover (19) intake end cover (19) be equipped with the separation cooling liquid and get into head bearing (14) between intake end cover (19) and cavity lead screw (2) A sealing ring (20) on one side.

4. The hollow internal cooling screw fixing structure of the machine tool according to claim 3, characterized in that: a head end space ring (21) capable of tightly supporting the inner ring of the head end bearing (14) is arranged between the tightening nut (17) and the head end bearing (14); the sealing ring (20) is a rotary oil seal; bearing frame (13) keep away from cavity lead screw (2) water inlet one end and be equipped with sealed dish (22), sealed dish (22) be rotary oil seal.

5. The hollow internal cooling screw fixing structure of the machine tool according to claim 3, characterized in that: still including setting up a set of side setting element (23) and a set of stopper (24) on the saddle, side setting element (23) set up respectively and be used for locating bearing frame (13) and motor cabinet (1) side in motor cabinet (1) and bearing frame (13) one side, stopper (24) set up motor cabinet (1) and the relative one end terminal surface position of bearing frame (13) respectively again, stopper (24) supply motor cabinet (1) and bearing frame (13) terminal surface top respectively and lean on.

6. The hollow internal cooling screw fixing structure of the machine tool according to claim 5, characterized in that: the side positioning piece (23) is a positioning pin, and the limiting block (24) is a convex part in the saddle.

Technical Field

The invention relates to the field of machine tool transmission, in particular to a fixing structure of a hollow internal cooling lead screw of a machine tool.

Background

Along with the rapid development of domestic and foreign high-end numerical control machine tools, the position precision (mainly comprising positioning precision and repeated positioning precision) indexes of the numerical control machine tools are greatly improved, wherein the rigidity of the screw rod connecting and fixing structure and the thermal elongation of the screw rod have great influence on the position precision of the machine tool, so that higher requirements are provided for the design and the assembly of the screw rod fixing and connecting structure in the design and production manufacturing processes.

At present, a nut seat and a motor seat are generally adopted in a lead screw fixing structure in the design field of a vertical machining center along the radial direction and the axial direction without positioning, a lead screw is not cooled in a hollow space, the lead screw fixing structure of the mode has the defects that the whole rigidity is poor, the radial lead screw assembling precision needs to be aligned, time and labor are wasted, the position precision is easily lost due to the rise of the temperature of the lead screw in the work, and the like, so that the design of a novel lead screw fixing structure is necessary.

A patent application No. 201010610047.1 discloses a fixing structure of a hollow inner-cooling screw, which is to place a bearing at the tail end at the rear end of a water outlet, and since the bearing is a main heat generating component, the cooling liquid in the hollow screw does not circulate in the bearing part, resulting in poor cooling of the heat generating part.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides a hollow inner-cooling lead screw fixing structure with good cooling effect, and the technical scheme adopted by the invention is as follows:

the utility model provides a cold lead screw fixed knot constructs in lathe cavity, is including motor cabinet and hollow lead screw cavity lead screw circumference on be equipped with the delivery port, cavity lead screw play oil end stretch into in the motor cabinet in be equipped with the tail end bearing of cover on the cavity lead screw of establishing, tail end bearing be located the delivery port front end of cavity lead screw on threaded connection have a lock nut who compresses tightly tail end bearing inner circle the motor cabinet on be connected with the tail end bearing gland who compresses tightly tail end bearing outer lane still be connected with out the water flange the motor cabinet on be equipped with the export with the delivery port intercommunication play water flange and hollow lead screw between be equipped with a pair of sealing member of arranging the delivery port both sides in.

Furthermore, a tail end space ring capable of tightly supporting the inner ring of the tail end bearing is arranged between the tail end bearing and the locking nut; the sealing element is a rotary oil seal; a sealing ring is arranged at one end of the motor base, which is far away from the motor; the sealing ring is a rotary oil seal.

Further, cavity lead screw water inlet one end be equipped with the bearing frame cavity lead screw on the cover be equipped with the head bearing of arranging in the bearing frame on install head bearing gland, head bearing outer lane both ends face push up respectively and lean on head bearing gland and bearing frame head bearing and cavity lead screw shaft shoulder between be equipped with the top and lean on the join in marriage the grinding pad at head bearing inner circle cavity lead screw water inlet one end threaded connection have the top nut that can push up tight head bearing inner circle be connected with the water inlet flange on be connected with the water inlet end cover and cavity lead screw between be equipped with the sealing ring that separation coolant liquid entered head bearing one side.

Furthermore, a head end space ring capable of tightly supporting the inner ring of the head end bearing is arranged between the tightening nut and the head end bearing; the sealing ring is a rotary oil seal; the bearing block keep away from cavity lead screw water inlet one end and be equipped with sealed dish, sealed dish be rotatory oil blanket.

Further, still including setting up a set of side setting element and a set of stopper on the saddle, the side setting element set up respectively and be used for fixing a position bearing frame and motor cabinet side in motor cabinet and bearing frame one side, the stopper set up respectively and then the relative one end terminal surface position of motor cabinet and bearing frame, the stopper supply motor cabinet and bearing frame terminal surface top respectively and lean on.

Furthermore, the side positioning piece is a positioning pin, and the limiting block is a protruding part in the saddle.

By adopting the hollow internal cooling lead screw fixing structure, the tail end bearing is arranged at the front end of the water outlet, and a large amount of heat can be taken away by the tail end bearing when the cooling liquid circulates, so that a better cooling effect is achieved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is an enlarged view taken at A in FIG. 2;

fig. 4 is an enlarged view at B in fig. 2.

Detailed Description

The following specific embodiment that gives in the combination drawing does further introduction to hollow lead screw fixed knot structure, as shown in fig. 1 and fig. 2 be fixed with motor cabinet 1 on the saddle, penetrate hollow lead screw 2 in the motor cabinet 1, be equipped with delivery port 3 on the hollow lead screw 2, delivery port 3 stretches into in the motor cabinet 1, because hollow lead screw 2 water inlet generally all sets up at the tip, and delivery port 3 then sets up in hollow lead screw 2 circumference, in order to be connected conveniently with the motor, avoid shaft coupling shutoff water inlet, therefore hollow lead screw 2 is the delivery port one end with motor is generally connected with the motor through the shaft coupling, still be provided with the bearing frame 13 that supports the hollow lead screw 2 other end on the saddle.

On the premise of only considering the cooling problem, the setting of one end of the bearing seat can be fixed by adopting a conventional fixing means, so that the fixation of one end of the water outlet 3 is taken as an important structural design and reference is made to fig. 3, a tail end bearing 4 is arranged in the motor seat 1 and sleeved on the hollow screw rod 2 to support the hollow screw rod 2, the tail end bearing 4 is arranged at the front end of the water outlet 3, the front end indicated here is one end of the water inlet, the cooling liquid is set to flow into the hollow screw rod from one end of the water inlet and then flows out from the water outlet through a tail end bearing supporting and mounting part, and therefore the heat generated by the bearing can be rapidly taken away when the cooling liquid passes through the tail end bearing mounting part, and the cooling effect is improved. A locking nut 5 for tightly pressing the inner ring of the tail end bearing 4 is connected on the hollow screw rod 2 in a threaded manner, the other side of the inner ring of the tail end bearing 4 is tightly pressed through a shaft shoulder on the hollow screw rod 2, a tail end bearing gland 7 for tightly pressing the outer ring of the tail end bearing 4 is connected on the motor base 1, the other side of the outer ring of the tail end bearing 4 is tightly pressed and abutted through the motor base 1, a water outlet flange 8 is also connected on the motor base 1, an outlet 9 for flowing out cooling liquid is arranged on the water outlet flange 8, the outlet 9 is communicated with a water outlet 3, the cooling liquid flows into an external circulating system through the outlet 9 after being discharged from the water outlet 3, in order to realize sealing and avoid the leakage of the cooling liquid, a pair of sealing elements 10 is arranged between the water outlet flange 8 and the hollow screw rod 2, the sealing elements 10 are arranged on two sides of the water outlet 3, so that an annular channel is formed between the water outlet flange 8 and the hollow screw rod 2, and the annular channel connects the water outlet 3 with the outlet 9, when the hollow screw rod 2 rotates, the cooling liquid can flow to the outlet 9 through the annular channel enclosed by the sealing piece 10 no matter the water outlet 3 is positioned at any position. Tail end bearing gland 7 passes through bolted connection to motor cabinet 1 in this structure on, and go out on water flange 8 also passes through bolted connection to motor cabinet 1, can carry out the connection of water flange 8 through bolt dislocation set, also can be through directly connecting water flange 8 and connect tail end bearing gland 7 in the lump and fix to motor cabinet 1, the way of generally adopting earlier installation tail end bearing gland 7 of course does benefit to 7 position adjustment of tail end bearing gland to and can realize better tight effect in top to the tail end bearing.

In the above, referring to fig. 3, the fixing structure of the hollow screw 2 on the water outlet side is further described, and the water inlet side may adopt a conventional fixing structure, such as the structural design in application No. 201010610047.1, but in order to pre-stretch the hollow screw and make it have better rigidity requirement for tension, the fixing structure on the water inlet side is further improved, referring to fig. 4, a head bearing 14 sleeved on the hollow screw 2 is installed in a bearing seat 13 to support the water inlet section of the hollow screw 2, an outer ring of the head bearing 14 close to the water outlet end is abutted through the bearing seat, an inner ring of the head bearing 14 is abutted through a matching grinding pad 16 arranged between the head bearing 14 and a shaft shoulder of the hollow screw 2, and a jacking nut 17 abutting against the inner ring of the bearing is connected to the hollow screw 2 through the same thread, the bearing inner ring is clamped and positioned through the puller nut 17 and the matched grinding pad 16, the head end bearing cover 15 which is tightly propped against the outer ring of the head end bearing 14 is also arranged on the bearing seat 13, and the outer ring of the head end bearing 14 is clamped and positioned through the matching of the head end bearing cover 15 and the bearing seat 13. The bearing block 13 is also connected with a water inlet flange 18, the water inlet flange 18 is provided with a water inlet end cover 19, the water inlet end cover 19 is provided with a water inlet hole communicated with the water inlet of the hollow screw rod 2, and in order to prevent the cooling liquid from flowing into one side of the head end bearing 14, a sealing ring 20 is arranged between the water inlet end cover 19 and the hollow screw rod 2 for sealing. In the structure, the mounting mode of the head end bearing gland 15 and the water inlet flange 18 is communicated with the water outlet flange 8 and the tail end bearing gland 7. The structure is provided with the grinding matching pad 16, the hollow screw rod 2 can be pre-stretched by grinding the thickness of the grinding matching pad 16, the principle is that when the thickness of the grinding matching pad 16 is reduced, the inner ring of the head end bearing 14 cannot be completely abutted against the grinding matching pad 16, and therefore the abutting nut 17 needs to be screwed to enable the shaft shoulder of the hollow screw rod 2 to be drawn towards one side of the head end bearing 14, the water outlet end of the hollow screw rod 2 is fixed, and the shaft shoulder at the water inlet section needs to be moved to stretch the screw rod, so that the hollow screw rod 2 is pre-stretched in the form, the rigidity of the screw rod is increased, and the stretching amount is extremely small.

In order to better position and support the bearing seat 13 and the motor base 1, a set of side positioning elements 23 and a set of limiting blocks 24 are arranged on the saddle as shown in fig. 1, the side positioning elements 23 are respectively arranged on one sides of the motor base 1 and the bearing seat 13 and are used for positioning the side edges of the bearing seat 13 and the motor base 1, the limiting blocks 24 are respectively arranged at the end face positions of the opposite ends of the motor base 1 and the bearing seat 13, and the limiting blocks 24 are respectively used for abutting against the end faces of the motor base 1 and the bearing seat 13. The side positioning members may be positioning pins and the stop 24 may be raised portions of the saddle. The side positioning piece 23 is used for positioning the side of the bearing seat 13 and the motor seat 1, and the limiting block 24 can support the axial direction of the pull screw rod to achieve better rigidity requirement.

In order to avoid that sundries enter the bearing seat 13 and the motor base 1 to pollute and block the bearing during working, a sealing ring 12 and a sealing disc 22 are respectively arranged at one end of the bearing seat 13, which is opposite to the center of the hollow screw rod 2, of the motor base 1.

The above-mentioned sealing member 10, sealing ring 20, sealing ring 12 and sealing disk 22 are only names of sealing components at different positions, and can be sealed by conventional rubber rings, but because the hollow screw is a rotating component in this structure, it is best to use a rotating oil seal for better sealing effect.

When the lock nut 5 and the puller nut 17 cannot directly jack the tail end bearing 4 and the head end bearing 14 due to the specification limitation in the structure, a tail end space ring 11 capable of jacking an inner ring of the tail end bearing 4 is arranged between the lock nut 5 and the tail end bearing 4; a head end spacer 21 capable of tightly supporting the inner ring of the head end bearing 14 is provided between the tightening nut 17 and the head end bearing 14.