CN2514010Y

CN2514010Y - Metal detector for use in cotton pipe

Info

Publication number: CN2514010Y
Application number: CN 01263227
Authority: CN
Inventors: 张月平; 张萍; 朱中华
Original assignee: JINTAN CITY TEXTILE MACHINERY
Current assignee: Sula (Jintan) Textile Machinery Co., Ltd.
Priority date: 2001-10-15
Filing date: 2001-10-15
Publication date: 2002-10-02
Anticipated expiration: 2011-10-15

Abstract

The utility model relates to a metal detector in conveyor duct. The metal detector includes an inner tube, an outer tube, a launching coil, receiving coils and an end cover seat; the outer surface of the inner tube is provided with three annular grooves for installing one launching coil and two receiving coils; the outer surface of the inner tube is also provided with a annular concave section; the three annular grooves are arranged in the annular concave section; the outer cylindrical surface of the concave section is provided with an insulating layer; a magnetoconductive layer made of soft magnetic materials is arranged out of the insulating layer; a second metal shield is arranged out of the magnetoconductive layer; the end cover seat and the outer tube are made of metal aluminum, while the inner tube is made of engineering plastics; with the magnetoconductive layer, the metal detector can better collect magnetic lines in an alternating-current magnetic field, reduce eddy current loss; and with two metal shields made of different metals, the external interference prevention capability of the metal detector is improved.

Description

Metal detector in a kind of defeated cotton pipe

One, technical field:

The utility model relates to a kind of being used for and detects the device that textile fabric has or not metallic inclusion, refers more particularly to a kind ofly to be used for defeated cotton pipe and to detect the metal detector that whether contains metallic inclusion in the textile fabric such as cotton.

Two, background technology:

In textile industry, contain the damage that metallic inclusion can cause textile machine in the textile fabric, the metallic inclusion in the textile fabrics such as therefore necessary removing cotton.Being used for defeated cotton pipe at present surveys the metal detector that whether contains metallic inclusion in the textile fabric such as cotton and is made up of inner core and urceolus, urceolus is a steel, and inner core is made with fiberglass, outer surface at inner core is axially installed with three coils along it, a coil is a transmitting coil wherein, produce alternating magnetic field, two coils that are positioned at its both sides are receiving coil, produce induced potential, adopt differential connection between two receiving coils, therefore, when no metal object is passed through in the inner core, the induced potential that two receiving coils produce is cancelled out each other, and when having metal object to pass through in the inner core, just produces a differential voltage signal; The differential electrical signals that the control device of the metal detection device in the defeated cotton pipe then sends metal detection device is input three-joint pipe on-off circuit after voltage amplifier amplifies, and input relay is controlled executing agency by relay again.

Because the inner core of metal detector is made by fiberglass, its outer round surface will be provided with three annular grooves that are used to install coil, the annular groove that is used to install transmitting coil in the middle of guaranteeing is used to install distance equates it is very difficult between two annular grooves of receiving coil apart from its both sides, therefore the voltage signal that can cause two group of received coils to produce does not wait, and makes this device cisco unity malfunction; Because the circularity and the cylindricity of inner core are all very poor, the alternating magnetic field that causes transmitting coil to produce is out of shape simultaneously, and it is impure that receiving coil receives voltage signal, thereby can make this device produce misoperation; Because urceolus is a steel, when the external world has electromagnetic field of high frequency or radiation field to disturb, cause metal detector to have poor seismic behavior, eddy-current loss is big, the shortcoming that sensitivity is low.

Three, summary of the invention:

Goal of the invention of the present utility model is to provide the anti-external magnetic field of a kind of energy to disturb, and eddy-current loss is little, highly sensitive metal detector.Metal detector in the defeated cotton pipe of the utility model should solve the problem of following several respects;

(1) how to shield the interference of external high frequency magnetic field, radiation field or electric field to metal detector;

(2) equidistant accurate control between interior tube outer surface two receiving coils and the transmitting coil;

(3) how to reduce scattering and disappearing of the magnetic line of force in the alternating magnetic field, reduce eddy-current loss, improve shock resistance and sensitivity; The utility model is that the metal detector that solves by following technical solution in the defeated cotton pipe of the problems referred to above comprises inner core, urceolus, transmitting coil, receiving coil and end cap seat, axially be provided with three annular grooves along described inner core at its external peripheral surface, in the annular groove in the middle of described transmitting coil is wound on, and two receiving coils are wound in other two annular grooves, described urceolus suit outer tube, inner core and urceolus all are fixed on the cage of two ends, link to each other by securing member between urceolus and the two ends cage, inner core and urceolus are coaxial, external peripheral surface at inner core also is provided with a circular concave section, the annular groove of described coiling transmitting coil and two receiving coils all is arranged in this circular concave section, and the annular groove of coiling transmitting coil equates between two annular grooves of the coiling receiving coil of its both sides, external peripheral surface at described circular concave section is wound with insulating barrier equably, outside insulating barrier, be provided with the magnetic layer of making by soft magnet material, also be provided with second metal screen layer at the magnetic layer outer surface, the urceolus of aluminium matter and end cap seat constitute first metal screen layer.

As the further improvement to the metal detector in the defeated cotton pipe of the utility model, described second metal screen layer is a copper sheet; The material of described inner core is engineering plastics, and the material of described magnetic layer is a nickel-zinc ferrite.

Because the excircle at the inner core of metal detector is provided with a circular concave section, be provided with the magnetic layer of making by soft magnet material at transmitting coil and receiving coil outer surface, it can assemble the magnetic line of force in the alternating magnetic field, reduce eddy current loss, outside magnetic layer, be provided with simultaneously second metal screen layer of making by copper sheet again, urceolus adopts metallic aluminium to make again, the urceolus of aluminium matter and two end cap constitute first metal screen layer, through the two-layer metal screen layer of making by different metal, make the antijamming capability of metal detector be improved like this.Former irony urceolus can only electric field shielding, can not shield high frequency magnetic field, can shield the interference to metal detector of outside electric field, high frequency magnetic field and radiation field after using aluminium matter urceolus instead; As second metal screen layer, can shield the electromagnetic field of high frequency and the radiation field of different frequency section with copper sheet.Because inner core is made by engineering plastics, can make described circular concave section and three annular grooves that are used to install coil wherein in its appearance with the lathe car exactly, thereby can accurately control the equivalence of transmitting coil to distance between the receiving coil of its both sides, simultaneously can fundamentally improve the circularity and the cylindricity of the endoporus and the cylindrical of inner core, thereby further improve the antijamming capability of metal detector.

Four, description of drawings:

Fig. 1 is the structural representation of metal detector;

Fig. 2 is the structural representation of inner core described in the metal detector;

Fig. 3 is the scheme of installation of metal detector in defeated cotton pipe,

10-metal detector among the figure, 20-control device, 30-executing agency.

Five, the specific embodiment:

Introduce the concrete structure of the metal detector in a kind of defeated cotton pipe for example below in conjunction with accompanying drawing.

Metal detector comprises the inner core of being made by engineering plastics 9, the urceolus 3 of aluminium matter, transmitting coil 7, receiving coil 4, the end cap seat 1 of 8 and two aluminium matter, be provided with a circular concave section 91 at inner core 9 external peripheral surfaces, along inner core 9 axially, circular concave section 91 places that are provided with at the external peripheral surface of inner core 9 are provided with three annular grooves 92,93 and 94, annular groove 93 is positioned at annular groove 92, in the middle of 94, described transmitting coil 7 is wound in the annular groove 93, two receiving coils 4,8 are wound on respectively in annular groove 92 and 94, outer round surface at circular concave section 91 has curled one deck insulating tape equably, outside the insulating cement layer of cloth, twine one deck double faced adhesive tape more equably, and then nickel-zinc ferrite rectangular blocks of uniform size is bonded to each other together equably, make the outer round surface of circular concave section 91 form described magnetic layer 5, outer surface at magnetic layer 5 wraps one deck copper sheet 6 again, it is described second metal screen layer, the urceolus 3 of aluminium matter is sleeved on the outside of inner core 9, and urceolus 3 and inner core 9 are installed on the end cap seat 1 of aluminium matter, inner core 9 is gone up by it and is located cylindrical and be installed in the corresponding aperture on the two ends cage 1, urceolus 3 then is connected with the two ends cage by aluminium matter screw, guarantee that urceolus 3 and inner core 9 are coaxial, the urceolus 3 of aluminium matter and two ends cage 1 constitute described first metal screen layer.

Claims

1, the metal detector in a kind of defeated cotton pipe comprises inner core (9), urceolus (3), transmitting coil (7), receiving coil (4,8) and end cap seat (1), axial direction along described inner core (9) is provided with three annular grooves (92,93,94) at its outer round surface, in the annular groove (93) in the middle of described transmitting coil (7) is installed in, two receiving coils (4,8) are then installed in other two corresponding annular grooves (92,94); Described urceolus (3) is sleeved on outside the inner core (9), and inner core (9) and urceolus (3) all are fixed on the two ends cage (1), is linked to each other by securing member (2) between urceolus (3) and the end cap seat (1), it is characterized in that; Outer round surface at described inner core (9) also is provided with a circular concave section (91), described three annular grooves (93,92,94) that are used to install transmitting coil (7) and two receiving coils (4,8) all are located in this circular concave section (91), on the excircle of this circular concave section (91), be wound with insulating barrier equably, outside insulating barrier, be stained with the magnetic layer of making by soft magnetic bodies (5), outer second metal screen layer (6) that is provided with of magnetic layer (5); The material of described end cap seat (1) and urceolus (3) is all metallic aluminium.

2, according to the described metal detector of claim 1, it is characterized in that; Outer second metal screen layer (6) that is provided with of described magnetic layer (5) is a copper sheet; The material of the securing member (2) of described connection urceolus (3) and end cap seat (1) is any in aluminium matter, stainless steel, the engineering plastics; The material of described inner core (9) is engineering plastics, and the material of described magnetic layer (5) is a ferrite.

3, according to claim 1 or 2 described metal detectors, it is characterized in that: the material of described magnetic layer (5) is a nickel-zinc ferrite.