CN211208790U

CN211208790U - Power connector with tail outgoing line limiting structure

Info

Publication number: CN211208790U
Application number: CN201922250687.5U
Authority: CN
Inventors: 李成国; 王磊; 张明
Original assignee: Shenyang Xinghua Hwa Yick Rail Traffic Electrical Application Co ltd
Current assignee: AVIC optoelectronics Huayi (Shenyang) Electronic Technology Co.,Ltd.
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-08-07
Anticipated expiration: 2029-12-13

Abstract

The application relates to power supply unit technical field, especially relates to a take afterbody limit structure's power connector of being qualified for next round of competitions, and the power connector of taking afterbody limit structure of being qualified for next round of competitions includes: plug, socket and tail accessories; the plug is matched with the socket; one end of the plug is a wire outlet end, and the tail accessory is arranged at the wire outlet end of the plug. The power connector with the tail outgoing line limiting structure provided by the application supports and protects the electric wire at the outgoing line position of the plug through the tail accessory, so that the electric wire is prevented from being bent and damaged, and the safety of the plug and the socket in adaptive connection in the vehicle charging process is ensured.

Description

Power connector with tail outgoing line limiting structure

Technical Field

The application relates to the technical field of power supply equipment, in particular to a power supply connector with a tail outgoing line limiting structure.

Background

At present, after the subway vehicles are put in storage, the power connector needs to be connected to charge the subway vehicles, but the existing power connector is mostly in a mode of directly leading out wires from the tail end of a plug, the wires are easily bent at the tail end of the plug and are easily damaged, or an end cap is screwed at the tail end of the plug, the wires are led out from a tail cap, but the tail cap is frequently loosened from the plug and is easily fallen off, the wires are easily clamped in the process of screwing again, the wires are also easily driven to rotate together, the wires are damaged and leak electricity, and potential safety hazards of electric shock are generated for operators.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a power connector with a tail outgoing line limiting structure, so as to solve the technical problem that wires at the outgoing line position at the tail end of the power connector in the prior art are easy to damage to a certain extent.

The application provides take afterbody to be qualified for next round of competitions limit structure's power connector includes: plug, socket and tail accessories;

the plug is matched with the socket;

one end of the plug is a wire outlet end, and the tail accessory is arranged at the wire outlet end of the plug.

In the above technical solution, further, the tail attachment includes a tail attachment body and a connecting piece;

a first limiting convex tooth is formed at one end of the tail accessory body, a second limiting convex tooth is formed at the wire outlet end of the plug, and the first limiting convex tooth is matched with the second limiting convex tooth;

the tail attachment body is hollow and used for penetrating through a lead, and openings at two ends of the tail attachment body and the outlet of the plug are distributed along the same straight line;

the tail attaches the body with the leading-out terminal of plug passes through the connecting piece is dismantled and is connected.

In any of the above technical solutions, further, the connecting member is an annular structure, and the connecting member includes a limiting portion and a threaded portion;

the tail attachment body is provided with a flange part, and the flange part is limited in the limiting part;

the thread part is provided with a first thread, the surface of the outlet end of the plug is provided with a second thread, and the first thread is matched with the second thread.

In any of the above technical solutions, further, the tail accessory further includes a first wire harness, a second wire harness, a first fastener, and a second fastener, where the second wire harness is connected to the tail accessory body;

the first fastener penetrates through the tail attachment body and is in threaded connection with the plug;

the cross sections of the first wire bundling piece and the second wire bundling piece are both arc-shaped, the first wire bundling piece and the second wire bundling piece are oppositely arranged, a threading channel is formed between the first wire bundling piece and the second wire bundling piece, and the opening aperture of the threading channel is smaller than that of the tail attachment body;

through holes are formed in the two ends of the first wire bundling piece and the two ends of the second wire bundling piece and used for penetrating through the second fastening piece.

In any of the above technical solutions, further, the plug includes a plug assembly, a switch assembly, and a plug sleeve;

the plug-in assembly is arranged in the plug-in sleeve, and a gap is formed between the plug-in assembly and the plug-in sleeve;

the plug-in assembly comprises a main control jack and an auxiliary control jack which are electrically connected with each other, and the switch assembly is connected with the auxiliary control jack.

In any one of the above technical solutions, further, the switch assembly includes a push rod, a first trigger point and a second trigger point, an accommodating cavity is formed on an inner wall of the insertion sleeve, the push rod is disposed in the accommodating cavity, and the second trigger point is elastically connected to the accommodating cavity;

the push rod is provided with an operating part which is embedded on the surface of the plug;

a butting part is arranged between the push rod and the first trigger point, the first trigger point and the second trigger point are oppositely arranged, and the second trigger point is connected with the auxiliary control jack;

when the operating part is at a first position, the push rod pushes the abutting part to press the first trigger point to be in contact with the second trigger point;

when the operating part is at the second position, the push rod does not apply force to the abutting piece, and the first trigger point returns to the original position.

In any one of the above technical solutions, further, the socket includes an insulating housing and a conduction column disposed in the insulating housing, and the conduction column can be in adaptive connection with the master control jack.

In any of the above technical solutions, further, the device further comprises a protecting cover assembly, wherein the protecting cover assembly comprises a cover body and a fixing plate;

the fixing plate is arranged along the circumferential direction of the insulating shell, the cover body is hinged to the first side edge of the fixing plate, and a hasp is arranged on one side edge, far away from the fixing plate, of the cover body;

the fixing plate with the second side that first side is relative is provided with the hasp, the hasp with the hasp can lock each other.

In any one of the above technical solutions, further, the protecting cover assembly further includes an elastic member, a hinge frame is disposed at a first side edge of the fixing plate, the cover body is hinged to the hinge frame, one end of the elastic member is connected with the cover body, and the other end of the elastic member is connected with the hinge frame.

In any of the above technical solutions, further, the cover is provided with a detection device, the socket is provided with a detection channel, and when the cover is closed, the detection device is inserted into the detection channel and issues an instruction.

Compared with the prior art, the beneficial effect of this application is:

the power connector with the tail outgoing line limiting structure comprises a plug, a socket and a tail accessory; the socket sets up in the kneck that charges of vehicle, and the plug is connected with charging power supply electricity, when charging the vehicle, with plug and socket adaptation connection, switches on the circuit, can charge for the vehicle. The tail accessory is arranged at the wire outlet end of the plug, and an internal circuit wire of the plug is led out from the wire outlet end and is connected with the charging power supply after being supported by the tail accessory.

Therefore, the power connector with the tail outgoing line limiting structure provided by the application supports and protects the electric wire at the outgoing line position of the plug through the tail accessory, so that the electric wire is prevented from being bent and damaged, and the safety of the adaptive connection of the plug and the socket in the vehicle charging process is ensured.

Drawings

In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a plug of a power connector with a tail outgoing line limiting structure according to an embodiment of the present application;

fig. 2 is a cross-sectional view of a plug of a power connector with a tail outgoing line limiting structure provided in an embodiment of the present application;

FIG. 3 is a front view of a plug of a power connector with a tail outlet limit structure according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a socket and a cover assembly of a power connector with a tail outgoing line limiting structure according to an embodiment of the present disclosure;

FIG. 5 is a cross-sectional view of a receptacle and cover assembly of a power connector with tail outlet limit feature as provided in an embodiment of the present application;

FIG. 6 is a cross-sectional view of a plug of a power connector with a tail outlet limit structure according to an embodiment of the present disclosure from yet another perspective;

fig. 7 is an enlarged schematic view of fig. 6 at a.

Reference numerals: 1-plug, 101-plug assembly, 1011-main control jack, 1012-auxiliary control jack, 102-switch assembly, 1021-push rod, 1022-operation part, 1023-first trigger point, 1024-second trigger point, 1025-abutting part, 103-plug sleeve, 1031-containing cavity, 104-outlet terminal, 105-first limit convex tooth, 2-socket, 201-insulating shell, 202-conduction column, 3-tail accessory, 301-tail accessory body, 302-connecting piece, 303-first fastener, 304-second fastener, 305-first wiring piece, 306-second limit convex tooth, 307-second wiring piece, 401-fixing plate, 402-cover body, 403-buckle, 404-buckle, 405-elastic piece, 406-detection device, 407-detection channel, 408-articulated frame.

Detailed Description

The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments.

The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

A power connector with a tail outlet limit structure according to some embodiments of the present application is described below with reference to fig. 1 to 7.

Referring to fig. 1 to 4, an embodiment of the present application provides a power connector with a tail outgoing line limiting structure, including: a plug 1, a socket 2 and a tail accessory 3; the plug 1 is matched with the socket 2; one end of the plug 1 is an outlet terminal 104, and the tail accessory 3 is arranged at the outlet terminal 104 of the plug 1.

The power connector with the tail outgoing line limiting structure comprises a plug 1, a socket 2 and a tail accessory 3; socket 2 sets up in the kneck that charges of vehicle, and plug 1 is connected with charging power supply electricity, when charging the vehicle, with plug 1 and socket 2 adaptation connection, switches on the circuit, can charge for the vehicle. The tail accessory 3 is arranged at the outlet end 104 of the plug 1, and an internal circuit wire of the plug 1 is led out from the outlet end 104 and is connected with a charging power supply after being supported by the tail accessory 3.

Therefore, the power connector with the tail outgoing line limiting structure provided by the application supports and protects the electric wire at the outgoing line position of the plug 1 through the tail accessory, so that the electric wire is prevented from being bent and damaged, and the safety of the adaptive connection of the plug 1 and the socket 2 in the vehicle charging process is ensured.

In one embodiment of the present application, preferably, as shown in fig. 1 and 2, the tail attachment 3 includes a tail attachment body 301 and a connector 302;

a first limit convex tooth 105 is formed at one end of the tail attachment body 301, a second limit convex tooth 306 is formed at the wire outlet end 104 of the plug 1, and the first limit convex tooth 105 is matched with the second limit convex tooth 306;

the tail attachment body 301 is hollow inside and used for passing through a lead, and openings at two ends of the tail attachment body 301 and a wire outlet of the plug 1 are distributed along the same straight line;

the tail attachment body 301 is detachably connected to the outlet terminal 104 of the plug 1 by a connecting portion of the connector 302.

Further, the connecting member 302 is an annular structure, and the connecting member 302 includes a limiting portion and a threaded portion;

the tail body 301 is provided with a flange part, and the flange part is limited in the limiting part; the thread part is formed with a first thread, and the surface of the outlet end 104 of the plug 1 is formed with a second thread, and the first thread is matched with the second thread.

In this embodiment, a threading channel is formed inside the tail attachment body 301 for passing through an electric wire, and openings at two ends of the tail attachment body 301 and an opening of the outlet end 104 of the plug 1 are located on the same straight line, that is, the length direction of the tail attachment body 301 and the length direction of the plug 1 are the same direction and located on the same straight line, so that the tail attachment body 301 can effectively support a conducting wire at the position of the outlet end 104 of the plug 1, and the conducting wire is prevented from being repeatedly bent and easily damaged and broken. The tail attachment body 301 is butted with the plug 1, the first limit convex tooth 105 is spliced with the second limit convex tooth 306 in a matched mode, the tail attachment body 301 and the plug 1 are limited, the connecting piece 302 is sleeved with the tail attachment body 301, the connecting piece 302 is rotated, the limit portion of the connecting piece 302 is tightly butted with the flange portion of the tail attachment body 301, meanwhile, the first thread and the second thread are matched and screwed, the connecting piece 302 can connect the tail attachment body 301 with the plug 1, under the limit action of the first limit convex tooth 105 and the second limit convex tooth 306, the tail attachment body 301 cannot rotate relative to the plug 1, the condition that the connecting portion of the plug 1 and the tail attachment body 301 is easy to clamp wires is avoided, the tail attachment body 301 can be separated from the plug 1 by taking down the connecting piece 302, and the installation and disassembly are very simple.

It should be noted that, the connecting member 302 in the present application is made of copper alloy, and the copper alloy has a large pre-tightening force due to its own material characteristics, so that the tail body 301 can be effectively prevented from loosening.

In addition, a plurality of ribs are uniformly distributed on the outer surface of the connecting piece 302 at intervals and used for increasing the friction force of the surface of the connecting piece 302, so that the connecting piece 302 and the plug 1 can be screwed through the matched first thread and second thread when the tail body 301 and the plug 1 are locked through the connecting piece 302.

In one embodiment of the present application, preferably, as shown in fig. 1, the tail attachment 3 further includes a first wire harness 305, a second wire harness 307, a first fastener 303, and a second fastener 304, the second wire harness 307 being connected with the tail attachment body 301; the first fastener 303 penetrates through the tail attached body 301 and is in threaded connection with the plug 1; the cross sections of the first wire bundling piece 305 and the second wire bundling piece 307 are both arc-shaped, the first wire bundling piece 305 and the second wire bundling piece 307 are oppositely arranged, a threading channel is formed between the first wire bundling piece 305 and the second wire bundling piece 307, and the opening aperture of the threading channel is smaller than that of the tail attachment body 301; through holes are formed in both ends of the first wire bundling piece 305 and both ends of the second wire bundling piece 307, and the second fastening piece 304 is penetrated through the through holes.

In this embodiment, the first fastening member 303 and the second fastening member 304 may be bolts, a third thread is formed on the surface of the first fastening member 303, an installation groove is formed on the outlet end 104 of the plug 1, a fourth thread is formed on the inner wall of the installation groove, the third thread is matched with the fourth thread, the first fastening member 303 penetrates through the tail body 301 and then is connected into the installation groove, i.e. the tail body 301 is connected with the plug 1, the second wire bundling member 307 (or the first wire bundling member 305) is connected to an end surface of the tail body 301 facing away from the plug 1, the first wire bundling member 305 (or the second wire bundling member 307) is installed on an upper portion of the second wire bundling member 307, the openings of the two arcuate structures are arranged oppositely, two ends of the two wire bundling members are respectively fixed by the two second fastening members 304 and are screwed by nuts, a threading channel is formed between the two wire bundling members for passing through a conducting wire, the opening aperture of the threading channel is smaller than that of the tail attachment body 301 and is approximately the same as the diameter of the lead, so that the first wire bundling piece 305 and the second wire bundling piece 307 can carry out limiting clamping and supporting on the lead, and the lead is prevented from shaking or bending at the opening of the end part of the tail attachment body 301.

In one embodiment of the present application, preferably, as shown in fig. 1 to 3, the plug 1 includes a plug assembly 101, a switch assembly 102, a plug sleeve 103;

the plug assembly 101 is arranged in the plug sleeve 103, and a gap is formed between the plug assembly 101 and the plug sleeve 103;

the plug assembly 101 includes a primary control jack 1011 and a secondary control jack 1012 electrically connected to each other, and the switch assembly 102 is connected to the secondary control jack 1012.

Further, the socket 2 includes an insulating housing 201 and a conduction column 202 disposed in the insulating housing 201, and the conduction column 202 and the main control jack 1011 can be adapted and connected for conducting or cutting off a circuit.

In this embodiment, when the plug 1 is plugged into the socket 2, the insulating housing 201 of the socket 2 is just located in the gap between the plug assembly 101 and the plug sleeve 103, the conduction column 202 of the socket 2 is plugged into the main control jack 1011, the auxiliary control jack 1012 is conducted through the control switch assembly 102, and then the circuit of the main control jack 1011 is connected, so that the vehicle can be charged, and meanwhile, the plug 1 and the socket 2 are locked, so that the plug 1 and the socket 2 are prevented from being separated in the charging process.

In an embodiment of the present application, preferably, as shown in fig. 4, 6 and 7, the switch assembly 102 includes a push rod 1021, a first trigger point 1023 and a second trigger point 1024, an inner wall of the socket sleeve 103 is formed with a receiving chamber 1031, the push rod 1021 is disposed in the receiving chamber 1031, and the second trigger point 1024 is elastically connected with the receiving chamber 1031;

the push rod 1021 is provided with an operation part 1022, and the operation part 1022 is embedded in the surface of the plug 1;

an abutting part 1025 is arranged between the push rod 1021 and the first trigger point 1023, the first trigger point 1023 and the second trigger point 1024 are oppositely arranged, and the second trigger point 1024 is connected with the auxiliary control jack 1012;

when the operating part 1022 is in the first position, the push rod 1021 pushes the abutting piece 1025 to press the first trigger point 1023 down to be in contact with the second trigger point 1024;

when the operating portion 1022 is in the second position, the push rod 1021 does not apply a force to the abutting member 1025, and the first trigger point 1023 returns to the original position.

In this embodiment, the abutting piece 1025 is a wedge-shaped block, and the inner wall of the plug 1 is formed with an accommodating cavity 1031, two sides of the second trigger point 1024 are respectively and elastically connected with two connecting posts symmetrically arranged in the accommodating cavity 1031, and the two connecting posts are respectively sleeved with a spring (a compression spring is selected in this embodiment), the first trigger point 1023 is arranged on a mounting plate, the mounting plate is mounted on the top end surfaces of the two connecting posts and connected with the springs of the two connecting posts, when the operating part 1022 is located at a first position, the abutting flange of the push rod 1021 extrudes the abutting piece 1025, the springs compress, the abutting piece 1025 moves down in the accommodating cavity 1031, the first trigger point 1023 is in contact conduction with the second trigger point 1024, the main control jack 1011 is immediately in conduction with the auxiliary control jack 1012, and the vehicle can be charged; when the toggle operation part 1022 returns the operation part 1022 to the second position, the abutting flange of the push rod 1021 no longer presses the abutting piece 1025, the spring stretches, the abutting piece 1025 moves upwards in the accommodating cavity 1031, the first trigger point 1023 is separated from the second trigger point 1024, the circuit is cut off, and in this state, the spring is always in a stretching state, and the first trigger point 1023 and the second trigger point 1024 are also always in a separating state.

In one embodiment of the present application, as shown in fig. 4 and 5, it is preferred to further include a protective cover assembly comprising a cover body 402 and a fixing plate 401;

the fixing plate 401 is arranged along the circumferential direction of the insulating housing 201, the cover 402 is hinged to a first side of the fixing plate 401, and a buckle 403 is arranged on one side of the cover 402 away from the fixing plate 401;

a second side of the fixing plate 401 opposite to the first side is provided with a latch 404, and the buckle 403 and the latch 404 can be buckled with each other.

Further, the cover assembly further comprises an elastic member 405, a hinge bracket 408 is disposed at a first side of the fixing plate 401, the cover body 402 is hinged to the hinge bracket 408, one end of the elastic member 405 is connected with the cover body 402, and the other end of the elastic member 405 is connected with the hinge bracket 408.

In this embodiment, the fixing plate 401 is used to fix the socket 2, the fixing plate 401 is installed at a charging interface of a vehicle, i.e., the socket 2 can be fixed, when charging is not performed, the cover 402 is fastened, and the fastener 403 is fastened with the fastener 404, the cover 402 can seal the opening of the insulating housing 201 of the socket 2, so as to prevent the internal space of the insulating housing 201 and the conductive post from being wetted and ash falling, and the cover 402 is hinged to the hinge frame 408, so that the cover 402 and the socket 2 are actually designed in a split manner, and the situation that the compression amount of the sealing gasket is inconsistent when the cover 402 is fastened due to the size deviation of the parts can be avoided and adjusted.

The elastic member 405 may be a tension spring, but is not limited thereto, and the tension spring can keep the cover 402 in an open state, and always tends to be away from the opening of the insulating housing 201 of the socket 2, so that the cover 402 is kept in the open state.

Wherein, optionally, the inner wall of lid 402 is provided with the sealing washer for seal both when lid 402 and insulating casing 201 lock, strengthen dampproofing waterproof effect.

In an embodiment of the present application, as shown in fig. 5, it is preferable that the cover 402 is provided with a detection device 406, the socket 2 is provided with a detection channel 407, when the cover 402 is covered, the detection device 406 is inserted into the detection channel 407 and contacts with the conduction post 202 of the socket 2, and the detection device 406 is configured to give an instruction when the probe of the detection device 406 abuts against the conduction post 202.

In this embodiment, the detecting device 406 is electrically connected to the main console of the vehicle through a wire, when the detecting device 406 sends an indication, such as an indicator light is on, it indicates that the detecting device 406 is located in the detecting channel 407, thereby indicating that the cover 402 and the receptacle 2 are in a covering state, and further indicating that the plug 1 and the receptacle 2 are not conducted, at this time, an operator can safely overhaul the vehicle or operate the electrical connector, thereby avoiding an operation of an operator during overhauling the vehicle and operating the electrical connector, and ensuring the safety of the operator.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. The utility model provides a take afterbody to be qualified for next round of competitions limit structure's power connector which characterized in that includes: plug, socket and tail accessories;

the plug is matched with the socket;

2. The power connector with the tail outgoing line limiting structure according to claim 1, wherein the tail accessory comprises a tail accessory body and a connecting piece;

3. The power connector with the tail outgoing line limiting structure according to claim 2, wherein the connecting piece is of an annular structure and comprises a limiting portion and a threaded portion;

4. The power connector with the tail outgoing line limiting structure according to claim 2, wherein the tail accessory further comprises a first wire bundling piece, a second wire bundling piece, a first fastening piece and a second fastening piece, and the second wire bundling piece is connected with the tail accessory body;

5. The power connector with the tail outgoing line limiting structure according to claim 1, wherein the plug comprises a plug assembly, a switch assembly and a plug sleeve;

6. The power connector with the tail outgoing line limiting structure according to claim 5, wherein the switch assembly comprises a push rod, a first trigger point and a second trigger point, a containing cavity is formed in the inner wall of the inserting sleeve, the push rod is arranged in the containing cavity, and the second trigger point is elastically connected with the containing cavity;

7. The power connector with the tail outgoing line limiting structure according to claim 5, wherein the socket comprises an insulating shell and a conduction column arranged in the insulating shell, and the conduction column and the main control jack can be in adaptive connection.

8. The power connector with the tail outgoing line limiting structure according to claim 7, further comprising a protective cover assembly, wherein the protective cover assembly comprises a cover body and a fixing plate;

9. The power connector with the tail outgoing line limiting structure according to claim 8, wherein the protecting cover assembly further comprises an elastic member, a hinge frame is disposed at a first side edge of the fixing plate, the cover body is hinged to the hinge frame, one end of the elastic member is connected with the cover body, and the other end of the elastic member is connected with the hinge frame.

10. The power connector with the tail outgoing line limiting structure as claimed in claim 8, wherein the cover is provided with a detection device, the socket is provided with a detection channel, and when the cover is covered, the detection device is inserted into the detection channel and gives an indication.