SU756528A1 - Current-collecting device - Google Patents

Description

The invention relates to the design of current collection devices for the transmission of electrical signals from a stationary object to a rotating one and vice versa with tensometry of rotating machine parts.

Known designs of contact collector devices, in which the removal of an electrical signal from a rotating ring is made using a tensioned metal string covering this ring. Structurally, this device is made in the form of a block of stator and rotor sections mounted on the hollow shaft and in the flanges installed on this shaft on rolling bearings. The device contains a system of contact and insulating rings, corresponding to the number of strings, as well as a system of clamping 20 strings to contact rings [1].

Such a collector device does not provide sufficient stability of the transitional resistance due to the difficulty of creating constancy of the force 25 pressing the string to the slip ring along the arc of the girth. The constancy of the transition resistance is largely influenced by the radial and face beats of the ring surfaces.

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contact rings, which makes high demands on the accuracy of manufacture and assembly of the current collector. Contact elements of the string and ring wear out quickly, which prevents the use of this device at high speeds of rotation of the shafts and reduces the possibilities of application. A disadvantage of the known collector device is low reliability due to the fact that on each of the channels the current collection is provided with only one string, and when the contact of the string with the contact ring is weakened, the collector device becomes practically inoperable.

A collector device for transmitting electrical signals from stationary objects to a rotating, known body with a rotating shaft located in it is known, on which a rotor system of contact and insulating rings and a stator system with corresponding contact elements and insulating rings are located [2].

The purpose of the invention is to increase the stability of transitional resistance, reliability and durability, contact3

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four

elements

application.

Contact elements of the stator system are made in the form of elastic rings with a Υ-shaped cross section? two symmetrical ends of which are installed on insulating rings of the stator system, and the third end forms a sliding contact with the outer surfaces of the contact rings of the rotor system. In addition, the perforations are made at an angle of 45-60 ° to the radial direction. The contact elements of the stator system are made of beryllium bronze, and their working surfaces are covered with a thin layer of a conductive element. The contact elements of the stator system can be entirely made of conductive polymer.

FIG. 1 shows a single-channel current collection device; in fig. 2 shows section A-A in FIG. one; on . FIG. 3 and 4 - contact rings with radial and oblique cuts; in fig. 5 - deformation of the ring in the axial direction; in fig. 6 shows an example of a contact embodiment of a collector device; FIG. 7 is a section BB in FIG. 6

On the hollow shaft 1, into the hole of which the conductor 2 is passed, connected to the object of measurement, a contact ring 4 connected to the conductor 2 is seated through an insulating ring 3. In the case 5 a fixed ring 6 is installed, having a в-shape in cross section and connected to conductor 7, located on a non-rotating object. The ring 6 with its contacting part forms a sliding contact with the movable contact ring 4 and is pressed in the axial direction through the insulating ring 8 by the sleeve 9, which is screwed into the housing 5.

Collector device operates as follows.

When shaft 1 rotates, the movable ring 3 with its outer surface slides along the inner surface of the stationary contact ring 6 and the electrical signal comes from conductor 2 to conductor 7. The necessary contact of the rubbing surfaces is ensured by the fact that when screwing the sleeve 9 into the case 5 an axial force is created located along the contour of the outer surface of the stationary ring 6, which deforms the base of the col-. axially. The axial deformation of the ring with a constant outer diameter ϋ causes a change in the diametral size of the ring along its inner surface from size ό to size, and the gap to the side between the contacting surfaces will change by

8- As a result of deformation of the ring 6 in the axial direction by pressing it with the sleeve 9, a change in the nature of the coupling between the friction surfaces of the movable and fixed rings, i.e. necessary contact is reached.

The device (6) contains a hollow shaft 1, through which the conductors 2 coming from the measurement object are passed: a system of insulating rings 3 of the shaft, a system of contact rings 4 of the shaft to which the conductors 2 are connected, and also a system of fixed contact elements 5 in the form of rings with a cross section of попере-shape cut in the radial direction with notches with equal pitch. The contact elements 5 with their working surfaces form a sliding contact with the rings 4. To the contact elements 5 conductors are connected

6, supplying an electrical signal to the measuring device.

The system of contact elements 5 is installed in the housing 7, made of insulating material. Contact elements 5 are axially separated by insulating rings.

8. The housing 7 is installed in the fixed flange 9 and the flange 10 movable in the axial direction, which is screwed into the housing 7. The entire fixed system including the housing

7, flanges 9 and 10, fixed contact elements 5 and insulating rings 8, are mounted on rolling bearings 11 and 12, which are mounted on hollow shaft 1.

Due to the large contact angle (360 °) of fixed contact elements and moving contact rings of the shaft, as well as in connection with: ensuring uniform pressing force on the rubbing surfaces of fixed contact elements against the rubbing surfaces of moving contact rings of the shaft due to the elastic compliance of fixed contact rings Υ- shaped in cross-section, this collector device has a high stability of the transition resistance. The stability of the transition resistance of this collector also contributes to the fact that the fixed contact elements are made of a conductive polymer that has high antifriction properties, are provided with slots with equal pitch from the contact zone to the base belt in the radial direction, or are provided with slots with equal pitch at an angle 45-60 ° to the radial direction.

Due to the fact that the fixed contact elements are made of conductive polymer ·, and also due to the fact that due to the elastic compliance of the fixed contact 756528

elements do not require much pressure to press the contacting elements, the friction losses in the contact zone will be small, which makes it possible to use the proposed current-collecting device 5

at a high frequency of rotation of the shaft without danger of overheating and loss of stability of the transition resistance. Thereby, both the reliability of the proposed collector device and the durability of the contact elements are increased.

Claims (5)

Claim 15 1. A current collector for transmitting electrical signals from stationary objects to a rotating one, comprising a housing with a rotating shaft disposed therein, on which a rotor system of contact and insulating rings and a stator system with corresponding contact elements and insulating rings are located, characterized by 25 that, in order to increase the stability of the transition resistance, the reliability and durability of the contact elements, the expansion of the applicability, the contact elements of the stator system are made s in the form of elastic rings with a с-shaped cross section, two symmetrical ends of which are mounted on insulating rings of the stator system, and the third 35 end forms a sliding contact with external contact surfaces rings of the rotor system. 2. The device according to claim 1, wherein, in order to increase the elastic compliance of the contact elements of the stator system and to achieve uniform pressure distribution in the sliding contact zone of the stator and rotor contact rings, as well as to improve the conditions of heat removal from the rubbing surfaces, the образ-shaped contacts are provided with through slots in the radial direction, arranged with equal pitch, starting at the working surface of the ring. 3. The device according to PP. 1 and 2, characterized in that the scoring notches are made at an angle of 4560 ° to the radial direction. 4. The device according to PP. 1, 2 and 3, characterized in that the contact elements of the stator system are made of beryllium bronze, and their working surfaces are covered with a thin layer of conductive polymer. 5. The device according to PP. 1, 2 and 3, characterized in that the contact elements of the stator system are entirely made of conductive polymer.