DE2844717A1 - DRIVE UNIT WITH REDUCTION GEAR FOR OPERATING THE SCREWS OF SCREW CONVEYORS - Google Patents

Description

2844717 Dipl.-Phys. OE Weber. ds Munich 71

Patent attorney T Hofbrunnstrasse 47

Telephone: (089) 7 9150 50

Telegram: monopoly weaver munich

Telex: 05-2128 77

M 929

MARCHESINI Wainer Ponte Motta di Cavezzo

(Modena) Italy

Drive unit with reduction gear for the operation of the screw conveyors of tendon tube conveyors

It has been known for a long time that screw conveyors have been used for the horizontal and upward conveyance of granular or powdered material such as grain, sugar, chemicals, foundry sand, pourable cement and the like. These conveying devices consist practically of a pipe in which there is a screw conveyor arranged coaxially to this pipe rotates, during the orbital movement of the material normally fed through a funnel at one end of the pipe up to is conveyed through the pipe for discharge at the other end of the pipe.

These conveying devices fulfill a practically irreplaceable function, especially when conveying powdery Material that has a tendency to air atomization, such as pourable cement, or if an easy-to-transport conveyor system with little space is required and finally also when a dosing device is required

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will. Since the delivery rate of the worm of the rotation speed is known to be proportional to the device, as dosing also be used can.

The screw conveyors of these conveyor systems are generally driven by a drive unit consisting of an electric motor and a reduction gear c

This theoretically very simple solution causes a number of implementation difficulties in practice. The drive unit must namely be attached to an Eide lcs Fcrderronres in which the screw conveyor rotates, the low-speed output shaft perfectly coaxial with the screw shaft must be arranged. If desired, the worm shaft can also be used as a low-speed gear shaft. In this However, the problem is the perfectly coaxial arrangement with the outer tube surrounding the screw. Must continue the low-speed gear shaft must be completely protected from the penetration ** of the dust-like conveyed goods, as the conveyed goods such as sand and cement, generally causes abrasion. Furthermore, the manufacturing cost of the drive unit can be kept as low as possible, especially since the screw conveyor is increasingly used for "poor" conveyed goods how sand and cement are used and their outlets are therefore essentially dependent on the production costs.

From these considerations, the technical problem arises of producing a drive unit that has both the electric motor as well as the reduction gear, which is inexpensive and works perfectly or without any difficulty can be attached to the conveyor pipe of the screw, whereby the slow-running output shaft is perfectly coaxial with the screw shaft must lie.

The present invention has set itself the solution of the above-mentioned technical problem and aims to

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Creation of a drive unit with reduction gear, which practically all of the. posed. Requirements.

The drive unit with: motor and reduction gear for the actuation of screw conveyors rotating in a coaxially arranged conveying pipe for the transport of the material to be conveyed is based on the special technical criterion of mounting the two shaft ends of the screw shaft on journals / which are not can only be expanded, but are also characterized by the fact that they can be installed perfectly coaxially, by automatically attaching them to the tubular shaft.

These pins, the structural details of which will be explained in more detail below, also have the identifier on that they are in a roller bearing with appropriate dust "protection seals can be stored. This rolling bearing is designed in flange form and can be at one end of the Screw surrounding conveyor tube are attached. One of these appropriately modified bearings enables the där ^ n e ^ no-ebauten tenon attaching a cogwheel, which is about a pinion can easily be driven by an electric motor. The electric motor can for its part indirectly on the Flange to be stored.

The tubular shaft of the screw is therefore movable on one side and on the other in the sense of the invention He draws. which, thanks to their special training, are easy automatically arrange coaxially to the shaft when inserting. Each pin is supported by one with roller bearings and protective seals provided bearing supported, which is built into a kind of flange, which at one end of the screw conveyor outer tube is arranged. One of these appropriately modified flanges allows the installation of a gear that d. '. directly driven by a motor attached to this flange can be.

It should be noted that the drive motor is attached in such a way that its shaft is parallel to the pin axis,

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however, for technical reasons, to which subsequently is discussed in more detail, remains aloof from this.

The present invention therefore also offers the advantage that the bearing of the low-speed gear shaft also serves as a bearing for one end of the worm shaft. In addition, there is the advantage that the drive unit can be rotated in the assembly to himself and thus account can be taken to the space available on the screw conveyor, as can be arranged for various reasons and in various cases bulky components in the vicinity of the engine.

Further details of the invention are illustrated in more detail with reference to the accompanying purely schematic drawing. It shows:

Image "<shows the schematic. Cultivation of the two pins on the tube axis of the screw conveyor, which are coaxially inserted to into corresponding grooves in the welded at the both ends of the pipe ¹ * axis sleeves are introduced.

Figure 2 shows, in a disassembled state, the schematic assembly arrangement of one of the two pins, namely the Pin, which is mounted on the end of the worm shaft opposite the drive unit.

Figure 3 shows a preferred embodiment of the end-side Snail cones.

Figure 4 shows an axial section through one of the two sleeves on the two shaft tube ends of the screw conveyor inserted and secured.

. Figure 5 shows a section through the drive unit with reduction gear in the plane that passes through the axis the worm shaft and through the axis of the shaft of the electric motor for driving the reduction gear 'passes.

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With reference to Figure 1, a tubular worm shaft, i.e. a tube, is drawn with (1), around which a helically wound sheet metal strip is welded, which forms the worm. (2) and (3) denote the bearing journals that are inserted into the two ends of the tubular shaft (1). These bearing journals are shown in detail in Figure 3. With (4) and {5} two sleeves are referred to, which serve as a connecting element between the pipe I) and the pins (2) and (3). These sleeves are welded in advance into corresponding seats that are screwed into the ends of the tubular shaft (1; The seats are provided with grooves' a) (see Fig. 4) into which the ribs (b) (see Fig. 3) of the Pin ', 2} and (3) are used.

With reference to figure (2), (6) denotes the screw welded to the shaft (1). (7) denotes the flange that is attached to one end of the tube into which the rotating screw is installed is. This flange contains the sleeve; c) which receives the roller bearing (8) which is fastened to part (d) of the journal (2) with the aid of the threaded ring (9). Before that, however, the felt rings (10) are inserted between them, which serve as a seal, and a spiral spring is also used. ^M1 ), a resilient fastening ring (11a) and an oil sealing ring (12) are interposed. With (13) another sealing ring is designated and with (14) a cover is designated, which is attached to the edge (e '■ of the sleeve (c).

With reference to Figure 3, (f) denotes a hob or a milling cutter with volute flanks, with which the grooves clearly shown in Figure 2 are produced. The ribs (b) are ent-; ν calculated as involute and engage exactly in the grooves (a), so that when the pins are pushed in on the two sides of the shaft (1) an exactly coaxial arrangement of these 7-pins to the shaft (1) is achieved.

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With these assumptions, we shall now turn to the explanation from Figure 5, in which, as I said, the drive unit with reduction gear is shown, which at one end of the screw tube, in which the screw conveyor rotates, is attached »

With reference to this Figure 5, (15) denotes the tube in which the worm shaft (1) rotates. With (16) the flange (7) shown in picture "» is designated., (17) and (18) are two ball bearings. With (19) are two spacer rings and with (20) a thrust bearing is designated. With (21) denotes a wedge. (22) denotes a gear. (23) denotes a pinion attached to the part (24) on the shaft (25) of the electric motor. The part (24) is on the bearing (26) protected by a ring seal (27), ^l 2B) denotes two positioning rings, (29) and (30) denote two wedges.

The operation of the drive is now as follows: The part {25), which is practically an extension of the shaft of the electric motor forms ,, actuates the gear (22) via the pinion (23), the is attached to the pin (3) of the worm shaft M). The pin (3), which, as said, is arranged coaxially to the shaft (1), forms therefore not only the shaft of the gearwheel (23), but also the output shaft of the reduction gear. The flange (16), the corresponds to the flange (7) shown in Figure 2, is provided with a cover (31) in which the flange (g) of the Electric motor is installed.

The flange (16) and the cover (31) delimit a closed chamber (41) in which the bearings (17) and (18), the gear (22) and the pinion (23) are housed.

In picture 5 you can see clearly how the whole reduction gear is practically articulated on the pin (3), which is used for installation and removal in the sleeve (5) or from it

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Canoe can be pulled out, with these muJLf e with AusTicmme * 'some corresponds to minor changes in the socket shown in Figure 4.

The pin (3) therefore provides the means for the coaxial support of the while M), the means on which the The shaft rotates as well as the means for supporting the gear (22).

It goes without saying that the invention is not limited to the embodiment described above and that different variants and improvements are conceivable without thereby exceeding the scope of the invention.

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Claims (5)

PATENT CLAIMS 1. Drive unit with built-in reduction gear for the actuation of the screw conveyor of screw tube conveyors, characterized in that it consists of: a flange element (16) which is attached to one end of the tube (15) in which the screw rotates, and of a cover (31) is associated with said flange such that _f is formed together with the same a closed chamber (41); from a pin ', 3), which is received in a part of this chamber (41) and is supported by two bearings {17} and (18), the seat of which is molded into the chamber 41}, the other end of the pin ( 3) fixed and coaxially assigned to the screw shaft rotation .st and is also designed to support the shaft end; a toothed wheel (22) which is arranged in the chamber (41; Electric motor connected isr, which can be attached to the flange formed on the cover (31), the pinion (23) meshing with the wheel (22). 2 «Drive unit according to claim" *., Characterized in that the flange (16) and the pin 3) are suitable for hermetically sealing the pipe end (15), for which purpose a large number of felt rings (10), a spiral spring (11 ) t which press them together and an oil seal (12) which are pushed onto the pin section (3) protruding towards the pipe end (15). 3. Drive assembly according to claim 1, being characterized in that the pinion (23) connected to the pin (25) of the electric motor on a part '24) and mounted, which 909817/0754 Kf in the manner of a sleeve or better a bell on this pin (25) is pushed and fastened, this part (24) not being supported on the pin (25) of the electric motor, but also on a bearing (26) which is in the arc Cover (31 ) of the reduction gear attached flange is added. 4 * drive unit according to the preceding claims, characterized in that iir. The cover (31) of the flange (16) is also arranged in a pressure bearing [2Q) , which absorbs the pressure loads occurring at the V'ellendrehüna. 5. Artri ^ bsaggreaat according to claim 1, characterized in that daMH to facilitate the assembly and ^ ur perfectly koaxia-Jer arrangement of the worm shaft to the outer tube (15) and to guarantee that the geometric axis of rotation of the worm shaft remains completely immobile during the rotary movement ., two sleeves 'are available 4) and (5) each at one end of the hollow shaft' * · t are arranging coaxially thereto and within you mi ⁴ - longitudinal grooves sibd provided whose cross section forms an involute profile, and in that two Pins (2) and (3) are provided which can be inserted coaxially into the corresponding sleeves i.4) and (5) and are provided with grooves (b) with the same involute profile as sleeves (4) and (5) The pin (3) serves both as a bearing pin for the rotating worm shaft (1) and as a wheel pin for the gear wheel (23) of the reduction gear, while the other pin (2) is the rotating floating bearing for the other shaft nde of the shaft (2). '■ '. Drive unit according to claims 1 and 5 _f characterized in that said pin {2) walls at a £ of the worm tube 909817/0 ^ 5-4 (15). a flange (7) is mounted which has a sleeve (C) contains, in which, similar to that described for the reduction gear, apart from felt rings (103 a spiral spring (11) and at least one roller bearing (8) are installed. - 10 - 909817/0754