CN117111697A - Computer application informatization safety protection device - Google Patents

Computer application informatization safety protection device Download PDF

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Publication number
CN117111697A
CN117111697A CN202311162276.5A CN202311162276A CN117111697A CN 117111697 A CN117111697 A CN 117111697A CN 202311162276 A CN202311162276 A CN 202311162276A CN 117111697 A CN117111697 A CN 117111697A
Authority
CN
China
Prior art keywords
shell
fixedly arranged
protection device
informationized
safety protection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311162276.5A
Other languages
Chinese (zh)
Inventor
于婵婵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202311162276.5A priority Critical patent/CN117111697A/en
Publication of CN117111697A publication Critical patent/CN117111697A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/18—Packaging or power distribution
    • G06F1/181—Enclosures
    • G06F1/182—Enclosures with special features, e.g. for use in industrial environments; grounding or shielding against radio frequency interference [RFI] or electromagnetical interference [EMI]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
    • F16F15/085—Use of both rubber and metal springs
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2200/00—Indexing scheme relating to G06F1/04 - G06F1/32
    • G06F2200/16—Indexing scheme relating to G06F1/16 - G06F1/18
    • G06F2200/163—Indexing scheme relating to constructional details of the computer
    • G06F2200/1633—Protecting arrangement for the entire housing of the computer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Human Computer Interaction (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Casings For Electric Apparatus (AREA)

Abstract

The application provides a computer application informatization safety protection device, which comprises: a housing; the fixed frame, fixed frame respectively fixed mounting is in the both sides of shell, and the inside rotation of one side of fixed frame is connected with the thread bush, and the one end fixed mounting of thread bush has the knob, and the medial surface threaded connection of thread bush has the lead screw, and the one end rotation of lead screw is connected with the centre gripping frame. The application provides a computer application informationized safety protection device, which is characterized in that structures such as a shell, a fixed frame, a threaded sleeve, a knob, a screw rod, a clamping frame, a spring, a limiting plate, a clamping plate, a sliding sleeve, a sliding rod, a bottom plate, a rubber block and the like are matched with each other, when the computer application informationized safety protection device is used, the clamping frame drives the clamping plate to clamp a computer case, and the spring is used for storing force, so that the shell is impacted when the computer application informationized safety protection device is used, the computer case can be buffered, and parts inside the computer case can be protected.

Description

Computer application informatization safety protection device
Technical Field
The application relates to the technical field of computer protection, in particular to a safety protection device for computer application informatization.
Background
The computer is commonly called a computer, is a modern intelligent electronic device which is used for high-speed calculation, can perform numerical calculation and logic calculation, has a memory function, can run according to a program, automatically process mass data at high speed,
with the rapid development of computer technology and networks, computers have become an indispensable tool in work, study and life.
When the computer is used, the case is placed under or on a desk and is easy to be impacted, and when the case is impacted by the outside, the case lacks buffering function, so that parts inside the case are easy to be damaged.
Therefore, there is a need to provide a security device for computer application informatization, which solves the above technical problems.
Disclosure of Invention
The application provides a safety protection device for computer application informatization, which solves the problem that when a computer case is used, parts in the case are easy to damage due to collision.
In order to solve the above technical problems, the present application provides a security protection device for computer application informatization, including:
a housing;
the fixing frames are respectively and fixedly arranged on two sides of the shell, a threaded sleeve is rotationally connected in one side of the fixing frames, a knob is fixedly arranged at one end of the threaded sleeve, a screw rod is in threaded connection with the inner side surface of the threaded sleeve, a clamping frame is rotationally connected at one end of the screw rod, springs are fixedly arranged at two ends of one side of the inner side surface of the clamping frame, a limiting plate is fixedly arranged at one end of each spring, and a clamping plate is fixedly arranged at one side of each limiting plate;
the sliding rods are respectively and fixedly arranged at two ends of one side of the clamping frame, the outer side faces of the sliding rods are sleeved with sliding sleeves, and the sliding sleeves are fixedly arranged in the side faces of the shell;
the bottom plate is fixedly arranged at the bottom of the inner side surface of the shell, a through groove is formed in the bottom plate, and a plurality of rubber blocks are fixedly arranged at the top of the bottom plate;
the computer case is arranged at the top of the rubber block and is arranged between the two clamping plates.
Preferably, the both sides of the medial surface of shell are all fixed mounting has the installation pole, the lateral surface sliding connection of installation pole has the removal cover, the inside of the positive both ends of removal cover is all threaded connection has the locking screw, the bottom fixed mounting of removal cover has the roof, the bottom fixed mounting of roof has fixed cover, the medial surface fixed mounting of fixed cover has the installation pole, the inside fixed mounting of installation pole has the fan.
Preferably, the bottom of the lateral surface of the fixed cover is connected with a mounting frame in a threaded manner, and the inner lateral surface of the mounting frame is fixedly provided with a first filter screen.
Preferably, the top of the top plate is fixedly provided with a telescopic pipe, one end of the telescopic pipe is fixedly provided with a fixing ring, the inner side surface of the fixing ring is fixedly provided with a second filter screen, and one end of the fixing ring is fixedly arranged on the side surface of the shell.
Preferably, the bottom of shell fixed mounting has the mounting panel, the equal fixed mounting of periphery of bottom of mounting panel has the gyro wheel, the vent has all been seted up to the inside of mounting panel and the inside of the bottom of shell.
Preferably, the top of shell fixed mounting has the handle, the front of shell rotates and is connected with the door body, the front fixed mounting of door body has the handle, the front fixed mounting of door body has the display screen, the both sides of the medial surface of shell are all fixed mounting has the temperature-sensing ware.
Preferably, the top of the outer side surface of the shell is sleeved with a top cover, and fixing screws are connected with the inner parts of the bottoms of the two sides of the top cover in a threaded mode.
Preferably, one end of the fixing screw is arranged on the side face of the shell, and the installation rod is fixedly installed on the inner side face of the top cover.
Preferably, a handle is fixedly arranged at the top of the top cover.
Preferably, the front surface of the door body is fixedly provided with an observation window.
Compared with the related art, the computer application informationized safety protection device provided by the application has the following beneficial effects:
the application provides a safety protection device for computer application informatization, which is characterized in that structures such as a shell, a fixed frame, a threaded sleeve, a knob, a screw rod, a clamping frame, a spring, a limiting plate, a clamping plate, a sliding sleeve, a sliding rod, a bottom plate, a rubber block and the like are mutually matched, when the safety protection device is used, the clamping frame drives the clamping plate to clamp a computer case, and the spring is used for storing force, so that the shell is impacted when the safety protection device is used, the buffer effect is achieved on the computer case, and the protection effect is achieved on parts inside the computer case.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of a security device for computer application informatization according to the present application;
FIG. 2 is a schematic cross-sectional view of the housing shown in FIG. 1;
FIG. 3 is a schematic view of the base plate structure shown in FIG. 1;
FIG. 4 is an enlarged schematic view of portion A shown in FIG. 2;
FIG. 5 is an enlarged schematic view of portion B shown in FIG. 2;
FIG. 6 is an enlarged schematic view of portion C shown in FIG. 2;
FIG. 7 is a schematic diagram of a second embodiment of a security device with computer application informatization according to the present application;
FIG. 8 is a schematic cross-sectional view of the top cover of FIG. 7;
fig. 9 is a schematic structural diagram of a third embodiment of a computer application informationized safety protection device according to the present application.
Reference numerals in the drawings: 1. mounting plate, 11, roller, 12, ventilation opening, 2, housing, 21, handle, 22, display screen, 23, handle, 24, door, 3, fixed frame, 31, screw sleeve, 32, knob, 33, screw rod, 34, clamping frame, 35, spring, 36, limiting plate, 37, clamping plate, 38, sliding sleeve, 39, sliding rod, 4, computer case, 5, temperature sensor, 6, bottom plate, 61, through groove, 62, rubber block, 7, mounting rod, 71, moving sleeve, 72, locking screw, 73, top plate, 74, fixed cover, 75, mounting frame, 76, first filter screen, 77, mounting rod, 78, fan, 79, telescopic tube, 70, fixed ring, second filter screen, 8, top cover, 81, fixed screw, 9, observation window.
Detailed Description
The application will be further described with reference to the drawings and embodiments.
First embodiment
Referring to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, and fig. 6 in combination, fig. 1 is a schematic structural diagram of a first embodiment of a computer application informationized safety protection device according to the present application; FIG. 2 is a schematic cross-sectional view of the housing shown in FIG. 1; FIG. 3 is a schematic view of the base plate structure shown in FIG. 1; FIG. 4 is an enlarged schematic view of portion A shown in FIG. 2; FIG. 5 is an enlarged schematic view of portion B shown in FIG. 2; fig. 6 is an enlarged schematic view of the portion C shown in fig. 2. A computer application informationized security guard comprising: a housing 2;
the fixing frame 3 is fixedly arranged on two sides of the shell 2 respectively, a threaded sleeve 31 is rotatably connected in one side of the fixing frame 3, a knob 32 is fixedly arranged at one end of the threaded sleeve 31, a screw rod 33 is in threaded connection with the inner side surface of the threaded sleeve 31, a clamping frame 34 is rotatably connected at one end of the screw rod 33, springs 35 are fixedly arranged at two ends of one side of the inner side surface of the clamping frame 34, a limiting plate 36 is fixedly arranged at one end of the springs 35, and a clamping plate 37 is fixedly arranged at one side of the limiting plate 36;
the sliding rods 39 are respectively and fixedly arranged at two ends of one side of the clamping frame 34, a sliding sleeve 38 is sleeved on the outer side surface of the sliding rods 39, and the sliding sleeve 38 is fixedly arranged in the side surface of the shell 2;
the bottom plate 6 is fixedly arranged at the bottom of the inner side surface of the shell 2, a through groove 61 is formed in the bottom plate 6, and a plurality of rubber blocks 62 are fixedly arranged at the top of the bottom plate 6;
the computer case 4 is arranged on the top of the rubber block 62, and the computer case 4 is arranged in the middle of the two clamping plates 37.
The two sides of the inner side surface of the shell 2 are fixedly provided with mounting rods 7, the outer side surface of each mounting rod 7 is connected with a movable sleeve 71 in a sliding manner, the inner parts of the two ends of the front surface of each movable sleeve 71 are respectively connected with a locking screw 72 in a threaded manner, the bottom of the movable sleeve 7 is fixedly provided with a top plate 73, the bottom of the top plate 73 is fixedly provided with a fixed cover 74, the inner side surface of the fixed cover 74 is fixedly provided with a mounting rod 77, and the inside of the mounting rod 77 is fixedly provided with a fan 78.
The bottom of the outer side surface of the fixed cover 74 is connected with a mounting frame 75 through threads, and a first filter screen 76 is fixedly mounted on the inner side surface of the mounting frame 75.
The top of the top plate 73 is fixedly provided with a telescopic pipe 79, one end of the telescopic pipe 79 is fixedly provided with a fixed ring 70, the inner side surface of the fixed ring 70 is fixedly provided with a second filter screen 711, and one end of the fixed ring 70 is fixedly provided with the side surface of the shell 2.
The bottom of shell 2 fixed mounting has mounting panel 1, the equal fixed mounting of periphery of the bottom of mounting panel 1 has gyro wheel 11, vent 12 has all been seted up to the inside of mounting panel 1 and the inside of the bottom of shell 2.
The top of shell 2 fixed mounting has handle 21, the front of shell 2 rotates and is connected with door body 24, the front fixed mounting of door body 24 has handle 23, the front fixed mounting of door body 24 has display screen 22, the both sides of the medial surface of shell 2 are all fixed mounting has temperature-sensing ware 5.
When the fan is used, a user starts the fan 78, external air is pumped into the inner side surface of the fixed cover 74 through the fixed ring 70 and the telescopic pipe 79 by the rotation of the fan 78, and then is sprayed to the top of the computer case 4 through the first filter screen 76, so that the computer case 4 is blown to dissipate heat, and the air is discharged out of the inner side surface of the shell 2 through the ventilation opening 12;
when the first filter screen 76 and the second filter screen 711 are used, external impurities can be prevented from entering the inner side surface of the shell 2;
the movable sleeve 71 slides on the outer side surface of the mounting rod 7, so that the blowing position of the fan 78 can be adjusted, and after the fan 78 is adjusted to a proper position, a user can rotate the locking screw 72, so that one end of the locking screw 72 abuts against one side of the mounting rod 7, and the movable sleeve 71 is limited and fixed;
the rubber block 62 has a certain elasticity, so that the buffer function can be provided for the computer case 4.
The working principle of the safety protection device for computer application informatization provided by the application is as follows:
when in use, when a user needs to install the computer case 4, the user places the computer case 4 on the top of the rubber block 62, then the user can rotate the knob 32, so that the knob 32 drives the threaded sleeve 31 to rotate on the outer side surface of the screw rod 33, and the screw rod 33 moves towards one side of the computer case 4, and drives the clamping frame 34 and the clamping plate 37 to move towards one side of the computer case 4, so that the clamping plate 37 clamps and limits the computer case 4, and when the shell 2 is impacted, the spring 35 arranged on one side of the limiting plate 36 can play a buffering role, so that the computer case 4 is protected.
Compared with the related art, the computer application informationized safety protection device provided by the application has the following beneficial effects:
through shell 2, fixed frame 3, screw sleeve 31, knob 32, lead screw 33, centre gripping frame 34, spring 35, limiting plate 36, grip block 37, sliding sleeve 38, slide bar 39, bottom plate 6 and structure such as rubber piece 62 cooperate each other, when using, drive grip block 37 through centre gripping frame 34 and carry out the centre gripping to computer machine case 4 to make spring 35 hold the power, so when using, the shell receives the striking, can play the cushioning effect to computer machine case 4, plays the effect of protection to the spare part of computer machine case 4 inside.
Second embodiment
Referring to fig. 7 and 8 in combination, a second embodiment of the present application provides another computer application informationized security device according to the first embodiment of the present application. The second embodiment is merely a preferred manner of the first embodiment, and implementation of the second embodiment does not affect the implementation of the first embodiment alone.
Specifically, the second embodiment of the present application provides a computer application informationized safety protection device, which is different in that a top cover 8 is sleeved on the top of the outer side surface of the casing 2, and fixing screws 81 are connected to the inside of the bottoms of the two sides of the top cover 8 in a threaded manner.
One end of the fixing screw 81 is disposed on the side surface of the housing 2, and the mounting rod 7 is fixedly mounted on the inner side surface of the top cover 8.
The mounting rod 7 is mounted on the inner side surface of the top cover 8, so that the fan 78 is mounted on the inner side surface of the top cover 8, and the distance between the fan 78 and the computer case 4 can be adjusted by adjusting the top cover 8.
The top of the top cover 8 is fixedly provided with a handle 21.
When in use, a user can lift the top cover 8 upwards by the handle 21 so as to take down the top cover 8, thereby facilitating the movement of the top cover 8 by the user.
The working principle of the safety protection device for computer application informatization provided by the application is as follows:
when the computer case 4 is used, after the user installs the computer case 4 on the inner side surface of the housing 2, the user covers the top cover 8 on the top of the housing 2, until the fixing cover 74 moves to the top of the computer case 4, the user can rotate the fixing screw 81, so that the fixing screw 81 is in threaded connection inside two sides of the top cover 8, and one end of the fixing screw 81 abuts against the side surface of the housing 2, thereby limiting the top cover 8.
Compared with the related art, the computer application informationized safety protection device provided by the application has the following beneficial effects:
through the structure of top cap 8, set screw 81 etc. mutually supporting, when using, thereby the user can be according to the height of computer machine case 4 to adjust the whole size of device to avoid the bigger computer machine case 4 of device less, thereby cause the waste of space.
Third embodiment
Referring to fig. 9 in combination, a third embodiment of the present application provides another computer application informationized security device according to the first embodiment of the present application. The third embodiment is merely a preferred manner of the first embodiment, and implementation of the third embodiment does not affect the implementation of the first embodiment alone.
Specifically, the third embodiment of the present application provides a computer application informationized security device, which is different from the first embodiment in that the front surface of the door 24 is fixedly provided with the observation window 9.
The working principle of the safety protection device for computer application informatization provided by the application is as follows:
when in use, a user can observe the inner side surface of the shell 2 through the observation window 9, so that the user can know the use condition of various parts in the shell 2 conveniently.
Compared with the related art, the computer application informationized safety protection device provided by the application has the following beneficial effects:
when the computer case 4 is used, the user can observe the inside of the case 2 conveniently through the observation window 9, so that the user can operate conveniently later, and the user can observe the working state of the computer case 4 conveniently through the observation window 9.
The foregoing description is only illustrative of the present application and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present application.

Claims (10)

1. A computer application informationized security guard comprising:
a housing;
the fixing frames are respectively and fixedly arranged on two sides of the shell, a threaded sleeve is rotationally connected in one side of the fixing frames, a knob is fixedly arranged at one end of the threaded sleeve, a screw rod is in threaded connection with the inner side surface of the threaded sleeve, a clamping frame is rotationally connected at one end of the screw rod, springs are fixedly arranged at two ends of one side of the inner side surface of the clamping frame, a limiting plate is fixedly arranged at one end of each spring, and a clamping plate is fixedly arranged at one side of each limiting plate;
the sliding rods are respectively and fixedly arranged at two ends of one side of the clamping frame, the outer side faces of the sliding rods are sleeved with sliding sleeves, and the sliding sleeves are fixedly arranged in the side faces of the shell;
the bottom plate is fixedly arranged at the bottom of the inner side surface of the shell, a through groove is formed in the bottom plate, and a plurality of rubber blocks are fixedly arranged at the top of the bottom plate;
the computer case is arranged at the top of the rubber block and is arranged between the two clamping plates.
2. The computer application informationized safety protection device according to claim 1, wherein the installation rods are fixedly installed on two sides of the inner side surface of the shell, the movable sleeves are slidably connected on the outer side surface of the installation rods, locking screws are connected inside the two ends of the front surface of each movable sleeve in a threaded mode, a top plate is fixedly installed at the bottom of each movable sleeve, a fixed cover is fixedly installed at the bottom of each top plate, the installation rods are fixedly installed on the inner side surface of each fixed cover, and a fan is fixedly installed inside each installation rod.
3. The computer application informationized safety protection device according to claim 2, wherein the bottom of the outer side surface of the fixed cover is connected with a mounting frame through threads, and the inner side surface of the mounting frame is fixedly provided with a first filter screen.
4. A computer application informationized safety protection device according to claim 3, wherein the top of the top plate is fixedly provided with a telescopic tube, one end of the telescopic tube is fixedly provided with a fixing ring, the inner side surface of the fixing ring is fixedly provided with a second filter screen, and one end of the fixing ring is fixedly arranged on the side surface of the shell.
5. The computer application informationized safety protection device according to claim 4, wherein the bottom of the shell is fixedly provided with a mounting plate, rollers are fixedly arranged on the periphery of the bottom of the mounting plate, and ventilation openings are formed in the mounting plate and the bottom of the shell.
6. The computer application informationized safety protection device according to claim 5, wherein a handle is fixedly arranged at the top of the shell, a door body is rotatably connected to the front surface of the shell, the handle is fixedly arranged on the front surface of the door body, a display screen is fixedly arranged on the front surface of the door body, and temperature sensors are fixedly arranged on two sides of the inner side surface of the shell.
7. The computer application informationized safety protection device according to claim 1, wherein a top cover is sleeved on the top of the outer side surface of the shell, and fixing screws are connected to the inner parts of the bottoms of the two sides of the top cover in a threaded mode.
8. The computer application informationized safety protection device according to claim 7, wherein one end of the fixing screw is arranged on the side face of the shell, and the mounting rod is fixedly arranged on the inner side face of the top cover.
9. A computer application informationized safety shield according to claim 8 and wherein said top cover is fixedly secured with a handle at the top thereof.
10. The computer application informationized safety protection device according to claim 1, wherein the front surface of the door body is fixedly provided with an observation window.
CN202311162276.5A 2023-09-11 2023-09-11 Computer application informatization safety protection device Pending CN117111697A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311162276.5A CN117111697A (en) 2023-09-11 2023-09-11 Computer application informatization safety protection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311162276.5A CN117111697A (en) 2023-09-11 2023-09-11 Computer application informatization safety protection device

Publications (1)

Publication Number Publication Date
CN117111697A true CN117111697A (en) 2023-11-24

Family

ID=88812643

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311162276.5A Pending CN117111697A (en) 2023-09-11 2023-09-11 Computer application informatization safety protection device

Country Status (1)

Country Link
CN (1) CN117111697A (en)

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WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20231124

WD01 Invention patent application deemed withdrawn after publication