CN211787095U

CN211787095U - Control device for preventing computer USB interface from illegal external connection

Info

Publication number: CN211787095U
Application number: CN202020827447.7U
Authority: CN
Inventors: 张明书; 魏彬; 张伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2020-10-27
Anticipated expiration: 2030-05-18

Abstract

The utility model discloses a control device for preventing computer USB interface from illegal external connection, which comprises a front end locking part and a rear end reserved part fixedly connected with the front end locking part; an external USB interface, a plugging and unplugging resistance firing pin for locking the external USB interface, a plugging and unplugging resistance firing pin connecting rod fixedly connected with the plugging and unplugging resistance firing pin, a telescopic connecting piece with one end fixed on the plugging and unplugging resistance firing pin connecting rod and an electromagnet are arranged in the rear reserved part; a striker clamping groove is arranged on the external USB interface, and the position of the striker clamping groove corresponds to a slot of an external USB joint; the outer part of the rear end reserved part is provided with an outer power supply port for controlling the on-off state of the electromagnet, when the electromagnet is powered on, the connecting rod for preventing the plug-in striker is attracted and retracted, when the electromagnet is powered off, the connecting rod for preventing the plug-in striker is driven to reset by utilizing the resetting of the connecting piece, and the plug-in striker penetrates through the striker clamping groove and extends into the slot. The utility model discloses can prevent effectively that computer USB interface from linking outward, improving the secret degree of information security.

Description

Control device for preventing computer USB interface from illegal external connection

Technical Field

The utility model relates to an information security protection field, concretely relates to prevent controlling means of computer USB interface illegal external connection.

Background

With the increasing popularity of automated office equipment, computers and their peripherals have become essential tools for document processing and information flow in institutes, military units, and enterprises. The computer brings great convenience to work and brings certain potential safety hazard, and because some people are useful or improper to operate, the secret divulging event happens occasionally, great loss is brought to governments and enterprises. The reason is that the mobile storage media are used alternately between the confidential computer and the non-confidential computer, and the illegal external connection phenomenon has attracted high attention of governments and related enterprises. Therefore, the research has important practical significance for protecting the computer and protecting the information security of the confidential computer.

At present, each unit in China increases security and confidentiality management strength and propaganda and education strength through administrative means, penalizes violation responsible persons and related units, and the measures play a certain role but cannot solve the problem fundamentally. Some units seal the USB port by using a glue gun or a USB sealing plug, but also reserve interfaces for USB connectors of a keyboard and a mouse, so that the former sealing behavior is similar to a nominal behavior, and the paralysis and the relaxation and the vigilance can be caused psychologically, and therefore, the great potential safety hazard exists.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a prevent controlling means of computer USB interface illegal external connection aims at solving the problem that current product application condition is single, can't satisfy the actual demand of security secrecy.

The embodiment of the utility model provides a prevent controlling means of computer USB interface illegal external connection, include: the front end locking part and the rear end reserved part are fixedly connected with the front end locking part;

the front end locking part comprises a locking joint which is used for being inserted into a computer USB interface, and a locking piece which is used for locking the computer USB interface is arranged on the locking joint;

the inside of the rear end reserved part is provided with at least one externally-connected USB interface for inserting a peripheral USB joint, a plugging and unplugging resistance firing pin for locking the externally-connected USB interface, a plugging and unplugging resistance firing pin connecting rod fixedly connected with the plugging and unplugging resistance firing pin, a telescopic connecting piece with one end fixed on the plugging and unplugging resistance firing pin connecting rod and an electromagnet; the other end of the connecting piece is fixed inside the reserved part at the rear end, a firing pin clamping groove which is opposite to the plug-in firing pin is arranged on the external USB interface, and the position of the firing pin clamping groove corresponds to a slot of the external USB joint; an external power supply port used for controlling the electromagnet to be powered on and off is arranged outside the rear-end reserved portion, when the electromagnet is powered on, the connecting rod for preventing the inserting and pulling firing pin is attracted and retracted, and when the electromagnet is powered off, the connecting rod for preventing the inserting and pulling firing pin is reset by the aid of the resetting of the connecting piece, so that the inserting and pulling firing pin penetrates through the firing pin clamping groove and penetrates into the slot.

Further, the locking member includes: the plastic locking buckle is arranged on one surface of the locking joint, and the elastic locking buckle is arranged on the other 3 surfaces of the locking joint.

Furthermore, locking joint one side is provided with 2 plasticity locking buckles, the other 3 sides of locking joint respectively are provided with 2 elasticity locking buckles.

Furthermore, the external USB interfaces are provided with 2 in parallel.

Furthermore, at least 2 plug striker blocking rods are arranged on the plug striker blocking connecting rod, and the at least 2 plug striker blocking rods respectively face to the striker clamping grooves of the 2 externally-connected USB interfaces.

Furthermore, each external USB interface is provided with 2 firing pin clamping grooves, and the plugging and unplugging firing pin connecting rod is provided with 4 plugging and unplugging firing pins which are respectively opposite to the 2 firing pin clamping grooves of each external USB interface.

Further, the 2 external USB interfaces are a keyboard USB interface and a mouse USB interface respectively.

Furthermore, each external USB interface corresponds to an electromagnet.

Furthermore, each electromagnet is connected with the outer power supply port through an electromagnetic control unit.

Further, the connecting piece is a return spring.

The embodiment of the utility model provides a prevent controlling means of computer USB interface illegal external connection, include: the front end locking part and the rear end reserved part are fixedly connected with the front end locking part; the front end locking part comprises a locking joint which is used for being inserted into a computer USB interface, and a locking piece which is used for locking the computer USB interface is arranged on the locking joint; the inside of the rear end reserved part is provided with at least one externally-connected USB interface for inserting a peripheral USB joint, a plugging and unplugging resistance firing pin for locking the externally-connected USB interface, a plugging and unplugging resistance firing pin connecting rod fixedly connected with the plugging and unplugging resistance firing pin, a telescopic connecting piece with one end fixed on the plugging and unplugging resistance firing pin connecting rod and an electromagnet; the other end of the connecting piece is fixed inside the reserved part at the rear end, a firing pin clamping groove which is opposite to the plug-in firing pin is arranged on the external USB interface, and the position of the firing pin clamping groove corresponds to a slot of the external USB joint; an external power supply port used for controlling the electromagnet to be powered on and off is arranged outside the rear-end reserved portion, when the electromagnet is powered on, the connecting rod for preventing the inserting and pulling firing pin is attracted and retracted, and when the electromagnet is powered off, the connecting rod for preventing the inserting and pulling firing pin is reset by the aid of the resetting of the connecting piece, so that the inserting and pulling firing pin penetrates through the firing pin clamping groove and penetrates into the slot. The embodiment of the utility model provides a can prevent effectively that computer USB interface from violating the rule and joining in marriage, improve the secret degree of information security.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic structural diagram of a control device for preventing a computer USB interface from illegal external connection according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a rear-end reserved portion of a control device for preventing a computer USB interface from illegal external connection according to an embodiment of the present invention;

fig. 3 is another schematic structural diagram of the rear-end reserved portion of the control device for preventing the computer USB interface from violating the external connection provided by the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a control device for preventing a computer USB interface from illegal external connection, including: the locking device comprises a front end locking part 1 and a rear end reserved part 2 fixedly connected with the front end locking part 1;

the front end locking part 1 comprises a locking joint 11 which is used for being inserted into a computer USB interface, and a locking piece 111 which is used for locking the computer USB interface is arranged on the locking joint 11;

at least one external USB interface 21 for inserting a peripheral USB joint, a plugging and unplugging prevention striker 22 for locking the external USB interface 21, a plugging and unplugging prevention striker connecting rod 23 fixedly connected with the plugging and unplugging prevention striker 22, a telescopic connecting piece 24 with one end fixed on the plugging and unplugging prevention striker connecting rod 23 and an electromagnet 25 are arranged in the rear-end reserved part 2; the other end of the connecting piece 24 is fixed inside the rear-end reserved part 2, a striker clamping groove 211 opposite to the plugging and unplugging blocking striker 22 is arranged on the external USB interface 21, and the position of the striker clamping groove 211 corresponds to a slot of the external USB connector; an external power supply port 26 for controlling the electromagnet 25 to be powered on and off is arranged outside the rear-end reserved portion 2, when the electromagnet 25 is powered on, the connecting piece 24 is retracted, and when the electromagnet 25 is powered off, the connecting piece 24 is reset to drive the connecting piece 23 to reset, so that the striker 22 penetrates through the striker clamping groove 211 and penetrates into the slot.

In this embodiment, on one hand, the purpose of locking the USB interface of the computer is achieved by providing the front-end locking part 1, and the effect of preventing the front-end locking part 1 from being pulled out is achieved by the locking part 11 provided on the locking joint 11; on the other hand, the rear end reserving part 2 is arranged to reserve the external USB interface 21, and the electromagnet 25, the connecting member 24, the plug striker rod 23, the plug striker 22 and other components are arranged to prevent the external USB connector from being pulled out. In addition, the front end locking part 1 and the rear end reserved part 2 are fixedly connected and can not be detached, so that the effects of locking a computer USB interface and locking the peripheral USB connector are achieved. In a specific application scenario, the front-end locking part 1 and the rear-end reserved part 2 are of an integral structure, so that the rear-end reserved part 2 cannot be detached and replaced.

Specifically, when the electromagnet 25 is powered on, the electromagnet 25 drives the plug striker-blocking connecting rod 23 to move in a direction away from the external USB interface 21 and retracts the connecting member 24, so as to drive the plug striker-blocking 22 to disengage from the striker slot 211; when the electromagnet 25 is powered off, the connecting member 24 is extended to drive the plug striker-blocking connecting rod 23 to move in a direction close to the external USB interface 21, so as to drive the plug striker-blocking 22 to be inserted into the striker latching slot 211 and further into the slot of the external USB connector, and finally, the effects of locking the external USB connector and preventing the external USB connector from being pulled out and replaced are achieved. Here, the peripheral USB connector in the present embodiment is a practical common USB connector, and a slot is usually provided on the common USB connector, so that the present embodiment can achieve the desired purpose without modifying the structure of the connector (i.e., inserting the anti-plugging striker 22 into the slot of the peripheral USB connector).

It should be noted that, in an initial state, that is, when the peripheral USB connector is not inserted into the external USB interface 21, the plugging/unplugging prevention striker 22 is in a state of being inserted into (or passing through) the pin slot 211, and when the peripheral USB connector needs to be inserted into the external USB interface 21, the electromagnet 25 needs to be powered on to drive the plugging/unplugging prevention striker 22 to be separated from the pin slot 211, so that the peripheral USB connector is smoothly inserted into the external USB interface 21.

The user can't extract by oneself after inserting the controlling means that this embodiment provided to computer USB interface, and because the front end locking portion 1 and the rear end reservation portion 2 fixed connection that controlling means contained and the rear end reservation portion 2 is right the plug control of peripheral hardware USB joint causes the user can't change other peripheral hardware USB interfaces by oneself plug, and can only by the administrator of controlling means realizes the reliable management to peripheral hardware USB mouth through the mode of managing external power supply to guarantee the inside information security of computer. The control device for preventing the computer USB interface from violating the external connection has the advantages of strong practicability, low manufacturing cost and high cost performance, and can be widely applied to the field of information security protection.

In an embodiment, one end of the connecting member 24 is fixed to the insertion/extraction preventing striker connecting rod 23, the other end of the connecting member 24 is fixed to the electromagnet 25, and the electromagnet 25 is provided with a groove for fixing and storing the connecting member 24; when the electromagnet 25 is powered on, the connecting member 24 retracts into the groove of the electromagnet 25, and drives the insertion/extraction preventing striker connecting rod 23 and the insertion/extraction preventing striker 22 to move towards the direction close to the electromagnet 25, that is, drives the insertion/extraction preventing striker 22 to separate from the striker clamping groove 211; when the electromagnet 25 is powered off, the connecting member 24 is ejected (or extended) from the groove of the electromagnet 25, and pushes the insertion/extraction preventing striker connecting rod 23 and the insertion/extraction preventing striker 22 to move in a direction away from the electromagnet 25, that is, the insertion/extraction preventing striker 22 is driven to be inserted into the striker slot 211.

In another embodiment, a fingerprint identification module for controlling the external power supply port 26 is further disposed outside the rear end reserved portion 2, so as to ensure that only a person authenticated by a fingerprint can activate the external power supply port 26. Of course, in other embodiments, a face recognition module or other authentication module may be disposed outside the rear-end reserved portion 2, as long as it is ensured that the use of the outer power supply port 26 can be conditionally restricted.

In one embodiment, the retaining member 111 includes: a plastic locking buckle 1111 disposed on one surface of the locking joint 11, and an elastic locking buckle 1112 disposed on the other 3 surfaces of the locking joint 11.

In this embodiment, the locking member 111 is configured as a plastic locking buckle 1111 and an elastic locking buckle 1112, wherein the plastic locking buckle 1111 has no elasticity and is a hard locking buckle. In the process that the locking connector 11 is inserted into the computer USB interface, the elastic locking buckle 1112 is deformed by the pressure of the inner wall of the computer USB interface (that is, the elastic locking buckle 1112 is pressed to be tightly attached to the locking connector 11), and when the locking connector 11 is completely inserted into the computer USB interface, the elastic locking buckle 1112 bounces and is fastened and fixed with the slot in the computer USB interface, so as to achieve the effect of locking the computer USB interface. In addition, this embodiment all is provided with locking piece 111 (promptly plastic locking buckle 1111 with elasticity locking buckle 1112) around locking joint 11, can improve the locking ability of front end latch segment 1, makes front end latch segment 1 has better locking effect.

It should be noted that the plastic locking buckle 1111 has a small volume, so that the locking connector 11 can be inserted into the USB interface of the computer. In a specific application scenario, the plastic locking buckle 1111 and the elastic locking buckle 1112 are both barbed.

In a specific embodiment, one side of the locking joint 11 is provided with 2 plastic locking buckles 1111, and the other 3 sides of the locking joint 11 are provided with 2 elastic locking buckles 1112 respectively.

In this embodiment, after the locking connector 11 is inserted into the USB interface of the computer, the elastic locking buckles 1112 on the 3 surfaces of the locking connector 11 are all fastened and fixed with the slots on the USB interface of the computer, so as to ensure that the locking connector 11 and the USB interface of the computer have higher stability.

In one embodiment, there are 2 external USB interfaces 21 arranged side by side.

In this embodiment, the rear-end reserved portion extends 2 external USB interfaces 21 through internal data lines, and when a legal external USB connector needs to be accepted, a manager of the control device can switch on the external power supply port 26 to achieve the purpose that the external USB connector is inserted into the external USB interface. In other embodiments, the number of the external USB interfaces 21 may be expanded or reduced as appropriate according to the actual use situation.

In a specific embodiment, the 2 external USB interfaces 21 are a keyboard USB interface 212 and a mouse USB interface 213, respectively, so as to meet the basic operation requirement of the computer, and avoid the influence of the insertion of other external USB connectors on the information security of the computer.

In an embodiment, the plug-in/pull-out preventing striker rod 23 is provided with at least 2 plug-in/pull-out preventing strikers 22, and the at least 2 plug-in/pull-out preventing strikers 22 respectively face the striker slots 211 of the 2 external USB interfaces 21.

In this embodiment, since the number of the external USB interfaces 21 is 2, at least 2 plug-in/pull-out blocking pins 22 for locking the external USB interfaces 21 are provided, and it is ensured that each external USB interface 21 corresponds to at least 1 plug-in/pull-out blocking pin 22.

In an embodiment, each external USB interface 21 is provided with 2 striker slots 211, and the plugging/unplugging-blocking striker link 23 is provided with 4 plugging/unplugging-blocking strikers 22, and respectively faces the 2 striker slots 211 of each external USB interface 21.

In this embodiment, 2 striker slots 211 are respectively disposed on 2 external USB interfaces 21, and accordingly, each external USB interface 21 corresponds to 2 plug-blocking strikers 22, that is, 4 plug-blocking strikers 22 are disposed in total, and the 4 plug-blocking strikers 22 are fixed on the plug-blocking striker connecting rod 23.

In a specific application scenario, there are 2 of the plugging/unplugging blocking striker connecting rods 23, each plugging/unplugging blocking striker connecting rod 23 is fixedly connected with 2 of the plugging/unplugging blocking pins 22, and striker clamping slots 211, which are respectively opposite to the 2 plugging/unplugging blocking pins 22, belong to the same external USB interface 21.

In one embodiment, each external USB interface 21 corresponds to an electromagnet 25.

In this embodiment, the 2 external USB interfaces 21 respectively correspond to the 1 electromagnet 25, that is, the 2 electromagnets 25 are disposed, so that the plugging/unplugging preventing pin connecting rod 22 corresponding to each external USB interface 21 can receive a magnetic force of sufficient size and uniform, and the plugging/unplugging preventing pin 21 can be completely separated from the slot and the pin slot 211.

In a specific embodiment, each external USB interface 21 is correspondingly provided with a plug striker connecting rod 23, each plug striker connecting rod 23 is correspondingly provided with an electromagnet 25, so that when the plug striker connecting rod 23 is attracted by the magnetic force of the electromagnet 25, the plug striker connecting rod 23 and the plug striker 22 fixed on the plug striker connecting rod 23 do not deviate in moving direction when moving in a direction away from the slot and the pin slot 211, and further, the plug striker 22 is ensured to just pass through the pin slot 211 and be inserted into the slot when being reset by a force, thereby achieving the effect of locking the external USB interface 21. In another embodiment, each of the external USB interfaces 21 corresponds to an electromagnet 25, and the 2 external USB interfaces 21 correspond to 1 plugging/unplugging striker connecting rod 23, that is, all the plugging/unplugging strikers 22 are fixed on one plugging/unplugging striker connecting rod 23, in this scenario, the electromagnets 25 need to be uniformly distributed on both sides of the plugging/unplugging striker connecting rod 23, so as to ensure that the plugging/unplugging striker connecting rods 23 are not biased to any electromagnet 25 when being attracted by magnetic force to generate displacement.

In one embodiment, as shown in fig. 3, each electromagnet 25 is connected to the external power supply port 26 through an electromagnetic control unit 251.

In this embodiment, the 2 electromagnets 25 are respectively communicated with the electromagnetic control unit 251 through self-wound wires, and further communicated with the external power supply port 26, so as to achieve the effect of controlling the on/off of the electromagnets 25 through the external power supply port 26. In a specific application scenario, the 2 electromagnets 25 are all 5V power supply dc electromagnets. In another specific application scenario, the 2 electromagnets 25 are all shoe electromagnets.

In one embodiment, the connecting member 24 is a return spring 241.

In this embodiment, the connecting member 24 is configured as a return spring 241, that is, one end of the return spring 241 is fixed on the plug pin blocking connecting rod 23, and the other end is fixed inside the rear end reserved portion 2. When the electromagnet 25 is powered on, the plugging pin blocking connecting rod 23 is attracted by the magnetic force of the electromagnet 25, and drives the plugging pin blocking 22 to move in a direction away from the pin clamping groove 211, so as to compress the return spring 241, at this time, the return spring 241 is compressed, so that the direction of the tension is opposite to the compression direction, but the tension of the return spring 241 is smaller than the magnetic force of the electromagnet 25; when the electromagnet 25 is powered off, the magnetic force of the electromagnet 25 disappears, the tension of the reset spring 241 pushes the plugging/unplugging pin connecting rod 23 to the pin clamping groove 211, and finally pushes the plugging/unplugging pin 22 into the slot opposite to the pin clamping groove 211, so that the effect of locking the peripheral USB plug is achieved.

In a specific application scenario, when the reset spring 241 is in an initial state (for convenience of reading, the initial state is referred to as a first compression state), that is, when a peripheral USB plug is not inserted into the external USB socket, the insertion/extraction resisting pin 22 is inserted into the pin slot 211 by means of a tension (referred to as a first tension for convenience of reading) of the reset spring 241, and when the electromagnet 25 is powered on, the reset spring 241 is pressed by the insertion/extraction resisting pin connecting rod 23 to have a second compression state and a corresponding second tension, it can be understood that, since the reset spring 241 is further compressed, the first tension is smaller than the second tension; when the electromagnet 25 is powered off, the return spring 241 pushes the plugging/unplugging pin 22 back into the pin slot 211 by using the second tension.

In a specific application scenario, when the connecting member 24 is a return spring 241, there are 1 of the insertion/extraction preventing striker connecting rods 23 fixed to one end of the return spring 241, and all the insertion/extraction preventing strikers 22 are fixed to the insertion/extraction preventing striker connecting rods 23. Of course, in other specific application scenarios, the number of the return springs 241 may be set to be the same as the number of the insertion/extraction-blocking striker links 23.

The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims

1. A control device for preventing computer USB interface from illegal external connection is characterized by comprising: the front end locking part and the rear end reserved part are fixedly connected with the front end locking part;

2. The control device for preventing the illegal external connection of the computer USB interface according to claim 1, wherein the retaining member comprises: the plastic locking buckle is arranged on one surface of the locking joint, and the elastic locking buckle is arranged on the other 3 surfaces of the locking joint.

3. The control device for preventing the computer USB interface from illegal external connection according to claim 2, wherein one surface of the locking joint is provided with 2 plastic locking buckles, and the other 3 surfaces of the locking joint are respectively provided with 2 elastic locking buckles.

4. The control device for preventing computer USB interfaces from illegal external connection according to claim 1, wherein 2 external connection USB interfaces are arranged side by side.

5. The control device for preventing the computer USB interface from illegal external connection according to claim 4, wherein the plug striker-blocking link is provided with at least 2 plug striker bars, and the at least 2 plug striker bars respectively face the striker bar slots of the 2 external connection USB interfaces.

6. The control device for preventing the computer USB interface from illegal external connection according to claim 5, wherein each external connection USB interface is provided with 2 striker slots, and the plug striker bar is provided with 4 plug striker bars, and the plug striker bars are respectively aligned with the 2 striker slots of each external connection USB interface.

7. The control device for preventing computer USB interface from illegal external connection according to claim 4, wherein the 2 external connection USB interfaces are a keyboard USB interface and a mouse USB interface respectively.

8. The control device for preventing illegal external connection of computer USB interfaces as claimed in claim 1, wherein each external USB interface is corresponding to an electromagnet.

9. The control device for preventing computer USB interface from illegal external connection according to claim 8, wherein each electromagnet is connected to the external power supply port through an electromagnetic control unit.

10. The control device for preventing the illegal external connection of the computer USB interface according to claim 1, wherein the connecting piece is a return spring.