CN201126456Y

CN201126456Y - Bared wire alarming idler pulley

Info

Publication number: CN201126456Y
Application number: CNU2007200610440U
Authority: CN
Inventors: 周开勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-12-07
Filing date: 2007-12-07
Publication date: 2008-10-01
Anticipated expiration: 2017-12-07

Abstract

The utility model relates to the field of an enamel-covered wire detecting and alarming device technology, particularly relates to a bare wire alarming guide pulley comprising a guide pulley, a conductive bearing mounted at the middle of the guide pulley, and a guide pulley axis sleeved on the center of the conductive bearing. The utility model adopts the conductive bearing so as to solve the problem of bad contact between an inner ring and an outer ring of the bearing, the resistance between the guide pulley axis and an enamel-covered wire copper core can accurately reflect the resistance between the enamel-covered wire copper core and the guide pulley, in this way, the loop from the enamel-covered wire copper core to the guide pulley axis is directly used as a switch amount without an amplification circuit and outputted to an alarming circuit, thereby providing reliable alarming information to the operator.

Description

Bare wire warning guide wheel

Technical field:

The utility model relates to the online detection alarm device technique of enameled wire field, particularly bare wire warning guide wheel.

Background technology:

At present, known bare wire warning guide wheel bearing ball bearing, its principle of work is: the copper core of enameled wire passes through rack earth before japanning, bare wire warning guide wheel with the japanning after enameled wire contact, bare wire warning guide wheel is communicated with bare wire warning guide wheel shaft by bare wire warning guide wheel bearing, bare wire warning guide wheel shaft and frame insulation, when the enameled wire surface does not normally varnish with lacquer between the copper core of bare wire warning guide wheel shaft and enameled wire with conducting, as their conductings then the alarm operative employee check reason.

Because there is lubricating oil on the ball surface of ball bearing, cause between bearing inner race and the outer ring conduction bad.May also have some some contacts to make it conducting when bearing is static, can form oil film on the ball surface when bearing runs up and make contact resistance very big and unstable.This point not to be noted during the design of known bare wire warning system thinks that original between bare copper wire and the bare wire warning guide wheel in the motion to contact the bad contact resistance that causes big and unstable, haves no alternative but adopt amplifying circuit to obtain Continuity signal; Its way is that report to the police guide wheel shaft and enameled wire copper core ground connection of bare wire is connected to the transistor liquid level relay as detected signal, amplifying circuit through transistor liquid level relay inside is exported to bare wire alarm lamp circuit with switching signal of detection signal amplification back generation, its shortcoming is, the intensity of detected signal is close with the intensity of undesired signal, through causing a large amount of misoperations of alarm lamp behind the amplifying circuit, the operative employee is reported to the police to bare wire lack trust, thereby be difficult to reach the warning effect of expection.

The utility model content:

The purpose of this utility model is to provide bare wire warning guide wheel at the deficiencies in the prior art, and it can avoid occurring because of undesired signal the problem of false alarm.

For achieving the above object, the utility model adopts following technical scheme:

It comprises guide wheel, and the guide wheel middle part is equipped with conductive bearing, and the conductive bearing center is connected to guide wheel shaft.

Described conductive bearing can be the sliding bearing of conduction, also can be the rolling bearing with conductive oil grease lubrication.

Described guide wheel shaft directly is connected with the external alert circuit, does not have amplifying circuit between guide wheel shaft and the external alert circuit.

The beneficial effects of the utility model are, after adopting conductive bearing, the problem of having got rid of the bearing enclose loose contact, resistance between guide wheel shaft and the enameled wire copper core can accurately reflect the resistance between enameled wire copper core and the guide wheel, so do not need amplifying circuit directly the enameled wire copper core to be exported to warning circuit to the loop between the guide wheel shaft as a switching value, provide reliable warning message to the operative employee.

Description of drawings:

Fig. 1 is a cut-open view of the present utility model

Embodiment:

Below in conjunction with accompanying drawing the utility model is further described.

See accompanying drawing 1, the utility model comprises guide wheel 10, and guide wheel 10 middle parts are equipped with conductive bearing 20, and conductive bearing 20 center are connected to guide wheel shaft 30.

Described conductive bearing 20 can be the sliding bearing of conduction, also can be that these bearings all have excellent conducting performance with respect to existing ball bearing with the rolling bearing of conductive oil grease lubrication.

Described guide wheel shaft 30 directly is connected with the external alert circuit, does not have amplifying circuit between guide wheel shaft 30 and the external alert circuit; When not varnishing with lacquer by guide wheel on the enameled wire surface, resistance is very little and very stable between guide wheel shaft and the enameled wire copper core, can reflect enameled wire finish coatings situation exactly, needn't through the amplifying circuit amplifying signal promptly can outputting high quality switching signal to warning circuit, avoided occurring the problem of false alarm fully because of undesired signal.

The utility model is concerned about the bad problem of conduction between ball bearing inner ring and the outer ring, has adopted conductive bearing 20, makes the contact resistance of bearing drop to extremely low.When conductive bearing 20 is selected the conduction sliding bearing for use, in order to alleviate the bigger influence of sliding bearing resistance, also adopted the higher guide wheel shaft 30 of diameter less conductive bearing 20 and surface smoothness, to reduce the resistance and the resistance arm of force.When conductive bearing is selected the rolling bearing of conductive oil grease lubrication for use, also should select the less conduction grease of less rolling bearing and resistance for use.Because new construction has been got rid of the problem of bearing enclose loose contact, the resistance between guide wheel shaft 30 and the enameled wire copper core can accurately reflect the resistance between enameled wire copper core and the guide wheel 10.And enameled wire has the cornerite of 90 degree on guide wheel, and when not varnishing with lacquer, actual contact is good between copper core and the guide wheel 10, and resistance approaches zero.So the utility model has saved amplifying circuit, directly the bare wire warning circuit is exported to as a switching value in enameled wire copper core to the loop between the guide wheel shaft 30.In addition, because the resistance between guide wheel shaft 30 and the enameled wire copper core can accurately reflect the resistance between enameled wire copper core and the guide wheel 10, can accurately reflect the japanning situation, also can measure its resistance value and reflect the thin or big inadequately situation of the more constant resistance of film defect of paint film, develop the online detection of more more valuable enameled wires and use.

Claims

1, bare wire warning guide wheel, it comprises guide wheel (10), it is characterized in that: guide wheel (10) middle part is equipped with conductive bearing (20), and conductive bearing (20) center is connected to guide wheel shaft (30).

2, bare wire warning guide wheel according to claim 1 is characterized in that: conductive bearing (20) can be the sliding bearing of conduction, also can be the rolling bearing with conductive oil grease lubrication.

3, bare wire warning guide wheel according to claim 1 is characterized in that: guide wheel shaft (30) directly is connected with the external alert circuit, does not have amplifying circuit between guide wheel shaft (30) and the external alert circuit.