CN101420147B

CN101420147B - Electric main shaft sealing construction for carving, milling and grinding

Info

Publication number: CN101420147B
Application number: CN2008102390891A
Authority: CN
Inventors: 李德才; 董国强; 蔡玉强; 黄彦; 李强
Original assignee: Beijing Jiaotong University
Current assignee: Beijing Jiaotong University
Priority date: 2008-12-08
Filing date: 2008-12-08
Publication date: 2010-09-29
Anticipated expiration: 2028-12-08
Also published as: CN101420147A

Abstract

The invention provides a sealing structure for an engraving, milling and grinding electric spindle, and relates to a sealing structure for magnetic liquid. An internal thread of a non-flux sleeve (9) forming the sealing component is connected with a thread of a rotor (1); a flux locking ring (3) is connected with a bearing support (10) by screw thread; a right pole terminal (6) is arranged at the bottom end of an annular hole in the flux locking ring (3); the magnetic liquid is injected in a clearance between the right pole terminal (6) and the flux locking ring (3); a permanent magnet (5), and a left pole terminal (4) are arranged at the left end of the right pole terminal (6) in sequence; the magnetic liquid is injected into a clearance between the left pole terminal (4) and the flux locking ring (3); the non-flux sleeve (9), the flux locking ring (3), the right pole terminal (6) and the left pole terminal (4) form the sealing component; an annular groove on a gland bush (2) is matched with an annular gear of the left pole terminal (4) to form labyrinth seal. The invention solves the problems of short service life, complicated structure and large energy consumption of the engraving, milling and grinding electric spindle.

Description

Electric main shaft sealing construction for carving, milling and grinding

Technical field

The present invention relates to a kind of magnetic liquid sealing structure, especially be applicable to carving, milling and grinding electricity sealing of spindles.

Background technology

At present, carving, milling and grinding electricity sealing of spindles is used labyrinth seal more, for the bushel iron bits that produce in preventing to cut enter seal clearance, has designed gas passage, by ventilating in passage, with the bushel iron bits main shaft that blows off.Carving, milling and grinding electricity main shaft comprises air bearing, and its rotating speed is 12.5 ten thousand～250,000 rev/mins; The high-speed electric main shaft rotating speed is 2.4 ten thousand～90,000 rev/mins, owing to have airway, makes the complex structure of carving, milling and grinding electricity main shaft, and needs source of the gas, and energy resource consumption is big; Labyrinth seal structure can not be realized zero leakage in addition, and useful life is shorter, has only the life-span of some months usually.

Summary of the invention

In order to overcome the carving, milling and grinding electricity main shaft life-span weak point that uses labyrinth seal structure, complex structure, deficiency that energy consumption is big, provide a kind of electric main shaft sealing construction for carving, milling and grinding.

The technical solution adopted for the present invention to solve the technical problems is:

Electric main shaft sealing construction for carving, milling and grinding, this structure comprises: gland, black box, bearing pedestal constitute the part and the connection thereof of black box:

The internal thread of non-flux sleeve is threaded with rotor, and non-flux sleeve is pressed on the bearing;

The magnetic conduction binding ring is connected with bearing pedestal by screw thread, and the magnetic conduction binding ring is pressed on the bearing;

Magnetic liquid is injected in the right pole shoe that round section joint ring the is housed looping pit bottom in the magnetic conduction binding ring of packing in the gap of right pole shoe that round section joint ring is housed and magnetic conduction binding ring;

The right pole shoe left end that round section joint ring is housed pack into successively permanent magnet, the left pole shoe of round section joint ring is housed; In the gap of left pole shoe that round section joint ring is housed and magnetic conduction binding ring, inject magnetic liquid;

Non-flux sleeve, magnetic conduction binding ring, right pole shoe, permanent magnet that round section joint ring is housed, the left pole shoe that round section joint ring is housed constitute black box.

Cannelure on the gland with the annular tooth matched in clearance of the left pole shoe of round section joint ring is housed, form labyrinth seal, gland is threaded with the magnetic conduction binding ring, with the black box axial compression on the magnetic conduction binding ring.

Gland is by non-magnet material: aluminium, aluminium alloy, copper or non-magnetic stainless steel are made, four cannelures of right side processing of gland.

Be processed with screw thread on the external diameter of magnetic conduction binding ring, and establish big and little two stepped holes.

Four cannelures processing on the right side on four annular tooth of processing and gland on the left side of left pole shoe of round section joint ring are housed realize its matched in clearance.

The invention has the beneficial effects as follows, simple in structure, the useful life that can realize zero leakage, cut down the consumption of energy, improve electric main shaft sealing construction for carving, milling and grinding.

Description of drawings

Fig. 1 is the magnetic liquid sealing structure figure of carving, milling and grinding electricity main shaft.

Fig. 2 is the A place partial enlarged drawing of Fig. 1.

Fig. 3 is left pole shoe front view.

Fig. 4 is left pole shoe left view.

Fig. 5 is left pole shoe vertical view.

Among the figure: rotor 1, non-magnetic conduction gland 2, magnetic conduction binding ring 3, left pole shoe 4, permanent magnet 5, right pole shoe 6, seal clearance 7, round section joint ring 8, non-flux sleeve 9, bearing pedestal 10.

Embodiment

The invention will be further described in conjunction with the accompanying drawings:

Electric main shaft sealing construction for carving, milling and grinding is seen Fig. 1, and this structure comprises: gland 2, black box, bearing pedestal 10, it is characterized in that, and constitute the part and the connection thereof of black box:

The internal thread of non-flux sleeve 9 is threaded with rotor 1, and non-flux sleeve 9 is pressed on the bearing;

Magnetic conduction binding ring 3 is connected with bearing pedestal 10 by screw thread, and magnetic conduction binding ring 3 is pressed on the bearing;

Magnetic liquid is injected in the right pole shoe 6 that round section joint ring 8 the is housed looping pit bottom in the magnetic conduction binding ring 3 of packing in the seal clearance 7 of the right pole shoe 6 that round section joint ring 8 is housed and magnetic conduction binding ring 3;

Right pole shoe 6 left ends that round section joint ring 8 is housed pack into successively permanent magnet 5, the left pole shoe 4 of round section joint ring 8 is housed; In the seal clearance 7 of left pole shoe 4 that round section joint ring 8 is housed and magnetic conduction binding ring 3, inject magnetic liquid;

Non-flux sleeve 9, magnetic conduction binding ring 3, the right pole shoe 6 that round section joint ring 8 is housed, permanent magnet 5, the left pole shoe 4 that round section joint ring 8 is housed constitute black boies.

Cannelure on the gland 2 with the annular tooth matched in clearance of the left pole shoe 4 of round section joint ring 8 is housed, form labyrinth seal, gland 2 is threaded with magnetic conduction binding ring 3, with the black box axial compression on magnetic conduction binding ring 3.

Gland 2 is by non-magnet material: aluminium, aluminium alloy, copper or non-magnetic stainless steel are made; Only be that mid portion in the right side of former carving, milling and grinding electricity mainshaft gland processes four cannelures.

Magnetic conduction binding ring 3 is seen Fig. 1, is processed with screw thread on its external diameter, and establishes big and little two stepped holes.

Left side pole shoe 4 is seen Fig. 3,4,5, and four cannelures processing on the right side on its left side on four annular tooth of processing and the gland 2 are realized its matched in clearance.

Fig. 2 is the A place partial enlarged drawing of Fig. 1, as seen from the figure the utmost point tooth of left and right pole shoe and the seal clearance 7 between the magnetic conduction binding ring 3.

Magnetic liquid forms several liquid round section joint ring and labyrinth seals on the utmost point tooth of left and right pole shoe, can prevent that introduced contaminants is by entering electric main shaft in the slit between black box and the non-flux sleeve 3.Because gland 2 is to be made by non-magnet material, so the magnetic attraction of permanent magnet can not be adsorbed on axle head with the bushel iron bits that produce in the working angles.

Claims

1. electric main shaft sealing construction for carving, milling and grinding, this structure comprises: gland (2), black box, bearing pedestal (10), it is characterized in that,

The part that constitutes black box comprises: non-flux sleeve (9), magnetic conduction binding ring (3), the right pole shoe (6) that round section joint ring is housed, permanent magnet (5), the left pole shoe (4) of round section joint ring is housed;

Connection between the part of formation black box:

At first the internal thread with non-flux sleeve (9) is connected with rotor (1) external screw thread, and non-flux sleeve (9) is pressed on the inner ring of bearing;

Secondly magnetic conduction binding ring (3) is connected with bearing pedestal (10) by screw thread, magnetic conduction binding ring (3) is pressed on the outer ring of above-mentioned bearing;

Once more round section joint ring is installed in the cannelure that right pole shoe (6) inner ring surface opens, magnetic liquid is injected in the right pole shoe (6) that round section joint ring the is housed looping pit bottom in the magnetic conduction binding ring (3) of packing in the gap of the right pole shoe (6) that round section joint ring is housed and magnetic conduction binding ring (3);

Round section joint ring is installed in the cannelure that left pole shoe (4) inner ring surface opens, right pole shoe (6) left end that round section joint ring is housed pack into successively permanent magnet (5), the left pole shoe (4) of round section joint ring is housed; In the gap of left pole shoe (4) that round section joint ring is housed and magnetic conduction binding ring (3), inject magnetic liquid;

Annular tooth matched in clearance on cannelure on last gland (2) the endoporus bottom and left pole shoe (4) left end face that round section joint ring is housed, form labyrinth seal, being threaded on the screw thread on gland (2) the endoporus anchor ring and magnetic conduction binding ring (3) external diameter is pressed on black box on the magnetic conduction binding ring (3) vertically.

2. electric main shaft sealing construction for carving, milling and grinding according to claim 1 is characterized in that: gland (2) is by non-magnet material: aluminium, aluminium alloy, copper or non-magnetic stainless steel are made, four cannelures of right side processing of gland (2).

3. electric main shaft sealing construction for carving, milling and grinding according to claim 1 is characterized in that: be processed with screw thread on the periphery of magnetic conduction binding ring (3), and establish stepped hole.

4. electric main shaft sealing construction for carving, milling and grinding according to claim 1 is characterized in that: four cannelures processing on the right side on four annular tooth of processing and gland (2) on the left side of left pole shoe (4) of round section joint ring are housed realize its matched in clearance.