JPS58116039A - Machining apparatus for rod and tube or the like such as thread cutting machine, tube cleaning machine or the like - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a machine for processing rods, pipes, etc., such as a spring thread cutting machine, a pipe cleaning machine, etc., as defined in the preamble of claim 1.

To drive a threading machine, a dual-purpose electric motor is often used as the motor, since this dual-purpose electric motor is relatively lightweight, which makes the threading machine easy to transport. The air inlet of the motor casing is formed and provided so that parts or movable parts under voltage can come into contact with tools, wires, etc. within the casing. can easily penetrate into the casing through the
Small foreign objects can also enter the interior of the casing through the air inlet and air outlet. Therefore, not only is there a danger if the operator accidentally touches, for example, parts that are under voltage, but the motor itself can be damaged by intruding foreign objects or jetted water.

Furthermore, the AC/DC dual-purpose electric motor has a high output shaft rotation speed, for example, 20,000 to 25,000 times/
1 minute, reaching a noise level that exceeds the permissible noise level.

The object of the invention is that it is impossible to accidentally touch parts under voltage or moving parts located inside the casing, that foreign objects or jet water cannot enter through the air intake and air outlet,
The object is to design a machine of the type mentioned at the outset in such a way that the air inlet and air outlet nevertheless ensure sufficient intake of cooling air.

This object is achieved according to the invention by the features of patent claim 1.

The cover in the area of the air inlet forms a contact protection. This is because this cover prevents direct access to live or moving parts within the casing. The intake air duct is designed in such a way that sufficient cooling air can be drawn in by the ventilation fan rotor of the motor, although contact is naturally prevented. However, the cover not only functions as a contact prevention member, but also prevents water and particulate foreign matter from entering. The filter provided at the air outlet likewise prevents the ingress of the aforementioned foreign substances, but the ventilation 7 unrotor ensures a smooth outflow of the cooling air sucked in from the air inlet. The present invention creates an electric motor that is lightweight, difficult to damage, and protects the operator from injury. Furthermore, the electric motor also satisfies a high noise protection effect, since the cover significantly reduces noise generation. Therefore, only one component is required for sound deadening, protection against contact, protection against jet water and prevention of ingress of foreign objects.

Other features of the present invention will become apparent from the following claims and the drawings.

The present invention will be explained in detail based on the illustrated embodiments.

The illustrated machine is a thread cutting machine, but it could also be a tube cleaning machine or other machine for processing and treating strands, tubes, etc. This machine uses electric motor 1, especially AC/DC dual-purpose electric motor (universal motor).
motor). A chuck 3 housed in a casing 2 is driven and rotated by an electric motor.

A workpiece to be machined is fixedly held by jaws (not shown) of this chuck 3, and is rotated about its axis via an electric motor 1. On the side of the casing 2 opposite the electric motor 1, a die head 6, a tube cutter 7 and a tool 8 for removing internal bulges of the tube are mounted on two guide rods 4.
, 5 in succession. The electric motor 1 is energized and cut off by a foot switch 9. The thread cutting machine is supported on legs 10 on the floor and has processing tools 6 to 8.
A reservoir 11 is provided in the lower range.

The electric motor 1 is equipped with a casing 12 (see FIG. 2) made of, in particular, synthetic resin. At one end of this casing,
A bearing 13 is provided to support one end of the drive shaft 14. This bearing is supported on the inner wall of the casing 1 via a horizontal support member 15. The other end of the drive shaft 14 is connected to another bearing 1
6 is rotatably supported. This bearing is housed in a connecting part 17 of the casing. The input shaft of the chuck 3 can be connected to the drive shaft 14 and the free end 18. The drive shaft 14 carries a rotor winding, 19, in the part between the two bearings 13,16. This rotor winding is surrounded at a short distance by a stator winding 20 fixed to the inner wall of the casing 1. A ventilation fan rotor 21 is mounted on the drive shaft 14 in a region between the rotor coil 19 and the bearing 16 so as not to rotate relative to each other. This ventilation fan rotor is used to cool the electric motor (two air inlets
Air can be sucked in from 2 and sent into the interior of the casing 12.

A current collector 23 is attached to the drive shaft 14 (two) in the area between the bearing 13 and the rotor coil A/19.
comes into contact. The bearing body 25 surrounding the bearing 13 carries an electrical connection 26 for an electrical conductor 27 .

The drive shaft 14 is driven in a known manner, thereby driving the chuck into rotation via its end 18 connected to the input shaft of the chuck 3. In this case, the ventilation fan rotor 21 is likewise driven, sucking cooling air through the air inlet 22 and feeding it into the casing 12 . The cooling air flows inside the casing in the direction of the arrow drawn, and then passes through the bearing 1.
The air flows out from the air outlet 28 near 6. Cooling air flows around the stator windings and rotor windings to cool them, thereby preventing the motor from overheating.

The air suction port 22 is covered by a cover 29. This cover is provided with a dish-shaped holding part 60. The edge 61 of this holding part, which is bent upstream and extends in the circumferential direction, abuts the inner wall 32 of the casing and the web 65. This web projects vertically inwardly from the sheathing wall 34 of the casing 12 and extends straight between opposite sides of the sheathing wall (see FIG. 3). The outer shape of the holding part 30 corresponds to the shape formed by the web 36 and the following part of the inner wall 32 of the casing 12 . Therefore, the entire circumference of the holding portion 60 and the entire surface of the edge portion 31 bent toward the upstream side are in contact with the web 33 and the opposing inner wall portion. The air inlet 22 is formed by an elongated opening 22a, 22b provided approximately in the center of the covering wall 64. The openings 22a have a rectangular contour and are parallel to each other. Aperture 22b likewise has a rectangular profile, but is shorter than aperture 22m and is also perpendicular to aperture 22a. Further, the openings 22a are arranged in one row, but the openings 22b are arranged in two rows (see FIG. 3).
.

The holding part 30 is provided with a central passage 35.

This passage has a rectangular contour and is delimited up the edge 36 of the holding part 30 oriented upstream. The passage 35 is located approximately half the length of the air suction port 22m, and has a width approximately half that of the air suction port. The passage 35 is located in a region downstream of the air suction port 22a (see FIG. 3), and reaches both end air suction ports 22m. Despite the provision of the cover 29, the cooling air sucked in through the air inlet 22 can sufficiently flow into the interior of the casing 12 through the passage 35.

The passage 35 is covered by a covering part 37.

This covering part 37 rests on the edge 36 of the holding part 30. The covering part 37 has a rectangular contour and its width is greater than the width of the channel 35 (resting on the end face of the edge 36 via the second one).The covering part 37 has a U-shaped cross section. 3, whose longitudinal edge 39 is bent towards the retaining part 3o and away from the edge 36.The narrow lateral edge 39a (see FIG. 3) of the covering part 37 is connected to the edge 56 of the passageway
It is in contact with a in an engaged state. The covering portion 37 is thus firmly but removably retained at the edge of the passageway. The portion other than the edge of the covering portion 37 is formed into a plate shape.

The filter 38 is formed in such a way that the drawn-in cooling air can flow unhindered into the interior of the casing. Edge 36 and edge 39 are separated, and further these edges are
As seen in the axial section of FIG. 2, they overlap one another, so that the flow openings 46 are designed in the manner of a labyrinth seal. This labyrinth packing reliably prevents water from entering the casing through the air suction port 22.
Prevent contact between wires, etc. and electrical components or rotating components inside the casing. Nevertheless, the cooling air sucked in by the ventilation fan rotor 21 flows unhindered into the interior of the casing.

This is due to the structure of the passage 65, the holding part 30 and the covering part 37.
This is due to the labyrinth-like structure between the two.

Instead of the filter 38 , spaced apart rib-like webs, knots or the like can be provided downstream in the area between the curved edges of the covering part 37 . When the covering part rests on the end face of the edge 36 of the retaining part 30, an intermediate chamber sufficient to allow cooling air to flow between the edge 36 and the covering part is formed by the webs, knots, etc. The use of the filter 38 has the advantage that particulate foreign matter and the like are retained in the filter 38 without flowing into the casing.

It is advantageous if the cover 29 is located inside the casing, since it cannot be damaged by accident. The cover can also be formed as an auxiliary part that can be installed later inside the casing. Thereby, existing electric motors can also be provided with this cover. The cover 29 consists in particular of an insulating material. Sufficient protective insulation is thus ensured also in the area of the cover. Furthermore, filter 3
8, the cover can be structurally designed to prevent solid foreign matter from entering the inside of the casing. In this case, it is easy to structurally form the passage 35 so that foreign matter with a diameter of 1 mm or more does not enter through the passage 35 even without using a filter.

Furthermore, it is also possible to design the cover in such a way that the cover 29 is attached to the covering wall 34 of the casing 12 or in such a way that it surrounds the casing 12 like a cap or completely. In this case as well, safety is high against intrusion of foreign objects, particularly foreign objects with a diameter of 1 mm or more, and jet water. Furthermore, this cover likewise prevents accidental contact with electrically conductive or rotating parts located within the casing.

Conveniently, the covering wall 34 is part of a cap 40 that is removably fastened to the other casing parts.

This makes it possible to assemble the covering part 29 very easily and, if necessary, to easily replace it. The side wall 41 of the cap 40 is provided with an electric insertion part 42 as shown in FIG. 3 to facilitate assembly with screws (not shown).The screws are inserted into the flange 44 through the opening 43, Then, it is screwed into a screw hole in another casing part provided on the end face side.

In order to prevent foreign matter, particularly foreign matter with a diameter of 1 mm or more, from entering through the air outlet 28, the air outlet is covered with a dust filter 45. This dust filter allows air to pass through smoothly.
and retain foreign objects.

The dust filter 45 preferably consists of a fine wire grid arranged inside the casing 12 in front of the air outlet 28 . This dust filter can be fixed, for example, by gluing, screwing, or the like.

Obviously, a dust filter may also be provided on the outer surface of the casing 12. Furthermore, the air outlet 28 itself can be formed as a filter, so that an additional filter can be provided.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a thread cutting machine according to the present invention equipped with an electric motor, FIG. 2 is an axial cross-sectional view of the electric motor, and FIG. 3 is a plan view of the electric motor shown in FIG. Figure 4 is the third
A sectional view taken along the line ■-■ in the figure, and FIG. 5 is a side view of the cap of the electric motor. 1... Electric motor 2... Casing 13.1
6... Bearing 14... Drive shaft 21... Ventilation fan rotor 22... Air intake port 28... Air outlet port 29...
Cover 35 river passage 45...filter

Claims (1)

[Scope of Claims] t. An electric motor, for example, an AC/DC dual electric motor, comprising a casing and a ventilation fan rotor, the casing comprising at least one air inlet and at least one air outlet, and the ventilation fan rotor comprising: It is attached to the drive shaft of the electric motor so that it does not rotate ζ2 relative to the drive shaft, and the drive shaft is
- rotatably supported within the thing by a bearing;
Machines for processing rods, pipes, etc., such as threading machines, pipe cleaning machines, etc., are provided at least in the area of the air inlet (22) with at least one cover (29) extending over substantially the entire cross-section of the passage of the air inlet. the cover comprises at least one passageway (35) for suction air;
A machine characterized in that the air outlet (28) is covered by a filter (45) or is formed by a filter sink. 2. The machine according to the patent, characterized in that the passage (35) is covered with respect to the air intake (22). 3. Machine according to claim 1 or 2, characterized in that the cover (29) is provided within the casing (12). 4. Any one of the preceding claims 1 to 3, characterized in that the cover (29) is provided with a labyrinth-like flow path (36,39) for passing air. The machine described in. 5. Machine according to any one of the preceding claims, characterized in that the cover (29) is completely installed as an accessory. 6. The cover (29) covers the holding part (30) and the covering part (
37), the covering part being in particular removably connected to the holding part. 2. The holding portion (30) is formed into a dish shape, and its edge (31) is in contact with the casing inner wall (32, 33) as described in any one of the patents to item 6. machine. 8. Machine according to one of the preceding claims, characterized in that the holding part (30) is provided with a passage (35). 9 A passageway (35) is formed by the cut-out of the retaining part (30) and in particular a bent edge (36) of the retaining part
, 56*).
The machine described in. 10. Machine according to one of the preceding claims, characterized in that the channel (35) has a rectangular contour. 1t The covering part (37) rests on the bent edge (36. 36m) of the holding part (30) under the opening of at least one flow opening (46). A machine according to any one of ranges 1 to 10. 12, the covering part (37) is attached to the edge (3) of the holding part (30)
12. Machine according to any one of the preceding claims, characterized in that the machine comprises a curved edge (39) spaced from 6). 13. The edge (39. 39a) of the covering portion (37) is
As seen in the axial sectional view of the motor, the edge (3) of the passage (35)
6. 13. A machine according to claim 12, characterized in that it overlaps with 368). 14. Claims 1 to 16, characterized in that the covering part (37) rests on the edge (56.36a) of the channel (35) via the filter (38).
The machine described in any one of the preceding paragraphs. 15. The machine according to any one of claims 1 to 14, characterized in that the dust filter (45) of the air inlet (28) is a reticular wire lattice. 16. The cover (29) is made of an insulating artificial material. A machine according to any one of claims 1 to 15.