CN109410402B - Building access control system - Google Patents
Building access control system Download PDFInfo
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- CN109410402B CN109410402B CN201811332764.5A CN201811332764A CN109410402B CN 109410402 B CN109410402 B CN 109410402B CN 201811332764 A CN201811332764 A CN 201811332764A CN 109410402 B CN109410402 B CN 109410402B
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00944—Details of construction or manufacture
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/30—Individual registration on entry or exit not involving the use of a pass
- G07C9/32—Individual registration on entry or exit not involving the use of a pass in combination with an identity check
- G07C9/33—Individual registration on entry or exit not involving the use of a pass in combination with an identity check by means of a password
Abstract
The invention discloses a building access control system, which comprises an electric control lock for controlling the opening and closing of a door body, an exit button arranged on the indoor side wall and used for controlling the unlocking of the electric control lock, and a password input device arranged on the outdoor side wall and used for controlling the unlocking of the electric control lock, wherein the electric control lock, the exit button and the password input device are respectively and electrically connected with an access control controller; the password input device realizes non-contact password input operation through two modes of an infrared photoelectric sensor and an air current matched air pressure sensor, dynamically adjusts the input password according to the existence of air current at the induction air outlet, realizes that the input values of the same set password are different when the password is input at each time, can effectively prevent password leakage caused by malicious peeking, and improves the security level of the password input device on the basis of not obviously improving the operation difficulty.
Description
Technical Field
The invention belongs to the field of building access control systems, and particularly relates to an access control system capable of preventing password leakage and invalidation due to the fact that password input is peeped.
Background
The access control system in the prior art is basically as shown in fig. 1, and comprises an electric control lock for controlling the opening and closing of a door body, an exit button installed on an indoor side wall and used for controlling the unlocking of the electric control lock, and a password input unit installed on an outdoor side wall and used for controlling the unlocking of the electric control lock, wherein the electric control lock, the exit button and the password input unit are respectively and electrically connected with an access control controller. The password input unit can also be a fingerprint input unit or a card reader or a camera with face recognition, and for a cell provided with a plurality of sets of access control systems, each access control unit can be in communication connection with a computer (server) through a switch, and the unified management of the plurality of sets of access control systems is realized through the computer.
Chinese patent No. CN205665760U discloses a gesture-unlocked access control system. The operation keyboard is matched with the shell to seal the shell, a locking mechanism used for locking and a control mechanism used for controlling the locking mechanism to work are arranged in the shell, the locking mechanism is arranged on one side of the shell, a power supply is arranged on one side, away from the locking mechanism, of the shell, and the operation keyboard is a non-contact keyboard. Compared with the prior art, the utility model discloses an advantage lies in with positive effect, the utility model discloses an access control system of gesture unblock utilizes non-contact keyboard and control mechanism, locking mechanical system's the perfect control that realizes entrance guard of cooperation, simultaneously, utilizes non-contact keyboard and control mechanism's cooperation to realize the gesture unblock, and then has solved the technical problem that traditional access control system exists, simultaneously, the utility model discloses simple structure, low cost, be fit for extensive the popularization.
The scheme of the above document adopts a non-contact keyboard, so that gesture unlocking is realized, and meanwhile, when a user unlocks, fingers do not need to contact with the keyboard, so that the sanitation problem is solved, however, the security level is low, and the password is easy to peep and is invalid.
The chinese patent application with the reference number CN107092839A discloses a password keyboard anti-theft input method based on random dummy codes, which is suitable for various password keyboards, overcomes the problem that the existing password keyboard leaves the trace of password input after long-term use, which causes the possibility of password leakage, and can satisfy the use of most of the password keyboards in society. The scheme of the invention adds a random virtual password input step in the password input process, the random virtual password preferentially selects the numbers consisting of non-passwords of the user, and the use trace of each key position on the password keyboard is continuously homogenized through the process of inputting the random virtual password by the user, thereby overcoming the possibility that the use trace left after the password input keyboard is used for a long time is exposed out of the composition of the password numbers. The method of the invention is simple, efficient, low in cost, convenient to implement and great in social benefit.
The scheme of the above document improves the security by adding the dummy digit password, but when the password is peeped, even if the original password is unknown, unlocking can be still realized as long as the password added with the dummy digit is input, and the security performance is not substantially improved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: to the not enough that prior art exists, provide a non-contact input and can prevent that the password from being peered high security building access control system.
In order to realize the purpose of the invention, the following technical scheme is adopted for realizing the purpose: a building entrance guard system comprises an electric control lock for controlling the opening and closing of a door body, an exit button arranged on the indoor side wall and used for controlling the unlocking of the electric control lock, and a password input device arranged on the outdoor side wall and used for controlling the unlocking of the electric control lock, wherein the electric control lock, the exit button and the password input device are respectively and electrically connected with an entrance guard controller;
the password input device comprises a shell and a front cover fixedly connected to the front side of the shell;
the whole shell is in the shape of a rectangular groove with a backward opening, and 10 first air inlets distributed in a circumferential array are formed in the front side wall surface in the shell; an air inlet seat is fixedly connected to the upper portion of the front side in the shell, a ventilation cavity communicated with each first air inlet is formed in the front side of the air inlet seat, a centrifugal fan is mounted at the lower end of the air inlet seat in the shell, a switching valve plate used for selectively shielding part of the first air inlets is rotatably mounted in the ventilation cavity, and a stepping motor used for driving the switching valve plate to rotate is fixedly connected to the rear side of the air inlet seat;
induction air outlets arranged in a rectangular array are formed in the front side wall of the front cover, and marks for identifying the number password keys corresponding to the induction air outlets are arranged at positions corresponding to the induction air outlets on the front side wall of the front cover;
the front side wall surface of the shell is provided with 10 first air grooves which are respectively communicated with the first air inlets, and the 10 first air grooves are respectively in one-to-one correspondence with 10 digital cipher keys '0, 1, 2, 3, 4, 5, 6, 7, 8 and 9';
the whole front cover is in the shape of a rectangular groove with a backward opening, a sensor mounting part is fixedly mounted between the front side wall outside the shell and the front side wall inside the front cover, and ventilation holes which are communicated with the induction air outlets and the first ventilation grooves in a one-to-one correspondence mode are formed in the sensor mounting part;
an air pressure sensor connecting hole communicated with the side wall of each vent hole is formed in the sensor mounting part corresponding to the position of each vent hole; the sensor mounting part is provided with air pressure sensors with the same number as the air vents, and the air pressure detection end of each air pressure sensor is communicated with the air pressure sensor connection holes;
the sensor mounting part is respectively provided with an infrared photoelectric sensor at the position adjacent to each vent hole, and the front cover is provided with a through hole or a light-transmitting piece part corresponding to each infrared photoelectric sensor;
the distance between the induction air outlet and the infrared photoelectric sensor at the corresponding position is required to satisfy the following conditions: when a finger approaches the induction air outlet, the infrared photoelectric sensor at the corresponding position can detect a signal;
a buzzer for prompting input information is arranged in the shell;
when the password input device inputs the number sequence password with more than 5 bits, the password is input in the following mode:
1) when a finger approaches an induction air outlet corresponding to a first digit of a password set value, an infrared photoelectric sensor at a corresponding position detects a signal, and a buzzer sounds to prompt that a first password is successfully input; at the same time, the centrifugal fan starts to work;
2) then, a finger approaches an induction air outlet corresponding to a second digit of the password set value, an infrared photoelectric sensor in a corresponding position detects a signal, and a buzzer sounds to prompt that the second digit of the password is successfully input;
3) the input value of the third password is determined by the state of the corresponding induction air outlet when the password set value and the second password are input;
3.1) if the air flow is blown out from the induction air outlet in the step 2), the input value of the third password to be input is equal to the set value +1 of the third password, and if the set value of the third password is 9, the input value of the third password is 0;
when a finger approaches an induction air outlet corresponding to a third password input value, the air pressure sensor at the corresponding position detects the increase of air pressure, the infrared photoelectric sensors at the corresponding positions detect signals, and the buzzer sounds to prompt that the third password is successfully input;
3.2) if no air current is blown out from the induction air outlet in the step 2), the input value of the third password to be input is the set value of the third password;
when a finger approaches an induction air outlet corresponding to the third password input value, an infrared photoelectric sensor at a corresponding position detects a signal, and a buzzer sounds to prompt that the third password is successfully input;
4) the password input value of the subsequent digit is determined by the password set value and the state of the corresponding induction air outlet when the last password is input; the input rule is the same as that in the step 3);
after the correct digital sequence password is input, the entrance guard controller controls the electric control lock to unlock, and simultaneously controls the rotation angle p of the stepping motor, wherein the angle p is an integral multiple of 36 degrees, and the rotation angles of the stepping motor are different every time.
As a preferable scheme: a circular groove-shaped notch is formed in the upper portion of the front side wall surface in the shell, each first air inlet is located in the range of the notch, and the circumference where each first air inlet is located is concentric with the notch; the switching valve plate is located in the range of the notch, and 4-6 through holes capable of being communicated with the first air inlets in equal quantity are formed in the switching valve plate.
As a preferable scheme: strip-shaped air inlet holes are uniformly formed in the front side wall of the front cover; an air inlet channel communicated with the air inlet hole and the air inlet end of the centrifugal fan is formed at the lower part of the shell; and a lower air inlet communicated with the ventilation cavity and the air outlet end of the centrifugal fan is formed at the lower end of the air inlet seat.
As a preferable scheme: the front side of the sensor mounting part is positioned below each row of ventilation holes to form a circuit board mounting groove, a circuit board is fixedly mounted in the circuit board mounting groove, and the infrared photoelectric sensor and the air pressure sensor are mounted on each circuit board nearby;
and the infrared photoelectric sensor, the air pressure sensor, the centrifugal fan and the stepping motor are respectively and electrically connected with the access controller.
As a preferable scheme: the switching valve plate is coaxially and fixedly connected with an output shaft of the stepping motor, and a shaft hole for the output shaft of the stepping motor to penetrate through is formed in the air inlet seat; the angle of each rotation of the stepping motor is 36 x t, t is a pseudo random number generated by the entrance guard controller, and t is an integer within the range of 1-8.
As a preferable scheme: 3 second air inlets communicated with the air vent cavity are formed in the front side wall of the shell below the first air inlet, and 3 second air vent grooves communicated with the second air inlets are formed in the front side wall of the shell; the 3 second vent grooves correspond to a "#" sign key, a "#" sign key and a doorbell key respectively.
As a preferable scheme: the casing rear side is connected with the back lid, sensor installation department, casing, air inlet seat and back lid pass through bolt fixed connection, the protecgulum side is connected with the casing side through the screw.
Compared with the prior art, the invention has the beneficial effects that: the password input device of the access control system realizes non-contact password input operation through an infrared photoelectric sensor and an air flow matched air pressure sensor, dynamically adjusts the input password according to the condition that whether the air outlet is induced to have air flow or not, realizes that the input values of the same set password are different when the password is input each time, can effectively prevent the password leakage caused by malicious peeking, and improves the security level of the password input device on the basis of not obviously improving the operation difficulty.
Specifically, the centrifugal fan is not operated when the password input device is in a standby state, and the input is realized through the infrared photoelectric sensor when a first password is input, and meanwhile, the centrifugal fan is triggered to operate; when the second password is input, the input is realized through an infrared photoelectric sensor, and whether the air outlet jets out air flow or not is sensed through fingers, so that the input value of the next password is judged; when the third password (and other subsequent passwords) is input, if the last password is input and airflow blows out from the induction air outlet, the input value of the third password (and other subsequent passwords) to be input is equal to the set value +1 of the current password, and if the last password is input and airflow does not blow out from the induction air outlet, the input value of the current password to be input is the set value of the current password. When the password is input at more than the third position, when the air flow is blown out from the induction air outlet at the corresponding position, the success of the input of the password at the position is confirmed only by the fact that the air pressure sensor and the infrared photoelectric sensor receive signals simultaneously. Because the password input device is in non-contact input, when the password input device is input, a finger triggers two infrared photoelectric sensors at the same time, and the probability of misoperation can be reduced by confirming the input through the air pressure sensor. In addition, because the air pressure detection end of the air pressure sensor is communicated with the air pressure sensor connection hole communicated with the side wall of the ventilation hole, when air flows through the ventilation hole, negative pressure is formed on the side wall of the ventilation hole due to Bernoulli effect, the air pressure sensor can judge which positions of the induction air outlets have air flows blown out by detecting the reduction of air pressure, whether the password input device is in a normal working state or not is convenient to confirm, the input password is ensured to be successfully compared with the set password after being input according to the set rule, and therefore unlocking is achieved.
Drawings
Fig. 1 is a block diagram of a prior art access control system.
Fig. 2 is a schematic structural diagram of a password input device in the present invention.
Fig. 3 and 4 are schematic exploded structural views of the password input device of the present invention.
Fig. 5 is a schematic structural diagram of a front cover of the password input device.
Fig. 6 is a schematic structural view of the front side of the housing, the sensor mounting portion, and the wiring board portion.
Fig. 7 is a schematic sectional structure view of the sensor mounting portion.
Fig. 8 is a schematic structural view of the rear side of the housing and the switching valve sheet portion.
Fig. 9 is a schematic structural view of the air inlet seat, the switching valve plate, the stepping motor and the centrifugal fan.
In the figure: 1. a housing; 11. a first vent channel; 11a, a first air inlet; 12. a second vent groove; 12a, a second air inlet; 13. an air intake passage; 14. a recess; 2. a front cover; 21. an air inlet hole; 22. sensing an air outlet; 23. a light-transmitting sheet section; 3. a rear cover; 4. a sensor mounting portion; 41. a circuit board mounting groove; 411. a photosensor mounting section; 42. a vent hole; 421. a pneumatic sensor connection hole; 5. a circuit board; 51. an air pressure sensor; 52. an infrared photoelectric sensor; 6. switching valve plates; 601. a through hole; 61. a stepping motor; 7. an air inlet seat; 71. a vent lumen; 72. a lower air inlet; 8. a centrifugal fan.
Detailed Description
The following describes in detail an embodiment of the present invention with reference to the accompanying drawings.
Example 1
With reference to fig. 1 to 9, the present embodiment is a building door control system, including an electric control lock for controlling the opening and closing of a door, an exit button installed on an indoor side wall and used for controlling the unlocking of the electric control lock, and a password input unit installed on an outdoor side wall and used for controlling the unlocking of the electric control lock, wherein the electric control lock, the exit button and the password input unit are respectively electrically connected to a door control device.
The password input device comprises a shell 1 and a front cover 2 fixedly connected to the front side of the shell.
The whole shell is in the shape of a rectangular groove with a backward opening, and 10 first air inlets 11a arranged in a circumferential array are formed in the front side wall surface in the shell; the improved air inlet valve is characterized in that an air inlet seat 7 is fixedly connected to the upper portion of the inner front side of the shell, a ventilation cavity 71 communicated with each first air inlet is formed in the front side of the air inlet seat, a centrifugal fan 8 is installed at the lower end of the air inlet seat in the shell, a switching valve plate 6 used for selectively shielding part of the first air inlets is installed in the ventilation cavity in a rotating mode, and a stepping motor 61 used for driving the switching valve plate to rotate is fixedly connected to the rear side of the air inlet seat.
A circular groove-shaped notch 14 is formed in the upper portion of the front side wall surface in the shell, each first air inlet is located in the range of the notch, and the circumference where each first air inlet is located is concentric with the notch; the switching valve plate is located in the range of the notch, and 4-6 through holes 601 capable of being simultaneously and respectively communicated with the first air inlets with equal quantity are formed in the switching valve plate.
The utility model discloses a set up induction air outlet, including protecgulum front side wall, be equipped with on the protecgulum front side wall and correspond each induction air outlet's position and be used for discerning the sign of the corresponding digital code key of each induction air outlet on the shaping of protecgulum front side wall with the response air outlet 22 that the rectangular array arranged, the position that corresponds each induction air outlet on the protecgulum front. The mark can be an upper convex or a lower concave Arabic number integrally formed on the front cover, and can also be a sticker printed with numbers.
Referring to fig. 6, 10 first ventilation grooves 11 respectively communicated with the first air inlets are formed in the front side wall surface of the housing, and the 10 first ventilation grooves respectively correspond to 10 digital cipher keys "0, 1, 2, 3, 4, 5, 6, 7, 8 and 9" one to one.
The whole rectangular channel shape that is the opening towards the back of protecgulum, fixed mounting has sensor installation department 4 between lateral wall before the casing is outer and the protecgulum in, and the shaping has the ventilation hole 42 that communicates each response air outlet and each first air channel one-to-one on the sensor installation department.
Each of the first air grooves 11 is used to communicate the vent holes 42 with the first air inlets 11a, and since the arrangement of the first air inlets is different from the arrangement of the vent holes (which are determined by the induction air outlets), the first air grooves are in shapes with different lengths as shown in fig. 6, so as to keep the airflow speed at the induction air outlets at a better consistency, so as to facilitate the setting of the set value of the air pressure sensor, and preferably make the lengths of the first air grooves approach each other.
An air pressure sensor connecting hole 421 communicated with the side wall of each vent hole is formed in the sensor mounting part corresponding to the position of each vent hole; the sensor installation portion is provided with air pressure sensors 51 with the quantity of the air holes and the like, and the air pressure detection end of each air pressure sensor is communicated with the air pressure sensor connection holes. When airflow flows through the air vents and the induction air outlets are not blocked, the air pressure sensor detects negative pressure, so that the access controller can conveniently judge which induction air outlets are in the state of blowing the airflow; there is the air current to flow through at the ventilation hole, and when the response air outlet received and sheltered from, baroceptor detected the pressure increase, and the access control ware of being convenient for judges which response air outlet is sheltered from (input the password promptly).
The set pressure value of the air pressure sensor (when the measured pressure value is larger than the set pressure value, an input signal is considered to be arranged at the corresponding position) or/and the power (airflow speed) of the centrifugal fan are/is adjusted through the access controller, so that when the distance between the fingers and the induction air outlet is smaller than 10mm, the access controller receives the input signal.
The position of the sensor installation part adjacent to each ventilation hole is provided with an infrared photoelectric sensor respectively, and the position of the front cover corresponding to each infrared photoelectric sensor is provided with a through hole or a light-transmitting piece.
When the light-transmitting sheet portion is mounted on the front cover, the front cover may be integrally formed of transparent plastic and then painted at portions other than the light-transmitting sheet portion. Or the transparent plastic is firstly molded by injection molding, then secondary injection molding is carried out, and a layer of non-transparent plastic is injected on the other parts except the light-transmitting sheet part.
The distance between the induction air outlet and the infrared photoelectric sensor at the corresponding position is required to satisfy the following conditions: the infrared photoelectric sensor at the corresponding position can detect signals when the finger is close to the induction air outlet. Specifically, the induction air outlet and the infrared photoelectric sensor are located within a range of 1 square centimeter.
And a buzzer for prompting input information is arranged in the shell.
When the password input device inputs the number sequence password with more than 5 bits, the password is input in the following mode:
1) when a finger approaches an induction air outlet corresponding to a first digit of a password set value, an infrared photoelectric sensor at a corresponding position detects a signal, and a buzzer sounds to prompt that a first password is successfully input; at the same time, the centrifugal fan starts to work;
2) then, a finger approaches an induction air outlet corresponding to a second digit of the password set value, an infrared photoelectric sensor in a corresponding position detects a signal, and a buzzer sounds to prompt that the second digit of the password is successfully input;
3) the input value of the third password is determined by the state of the corresponding induction air outlet when the password set value and the second password are input;
3.1) if the air flow is blown out from the induction air outlet in the step 2), the input value of the third password to be input is equal to the set value +1 of the third password, and if the set value of the third password is 9, the input value of the third password is 0;
when a finger approaches an induction air outlet corresponding to a third password input value, the air pressure sensor at the corresponding position detects the increase of air pressure, the infrared photoelectric sensors at the corresponding positions detect signals, and the buzzer sounds to prompt that the third password is successfully input;
3.2) if no air current is blown out from the induction air outlet in the step 2), the input value of the third password to be input is the set value of the third password;
when a finger approaches an induction air outlet corresponding to the third password input value, an infrared photoelectric sensor at a corresponding position detects a signal, and a buzzer sounds to prompt that the third password is successfully input;
4) the password input value of the subsequent digit is determined by the password set value and the state of the corresponding induction air outlet when the last password is input; the input rule is the same as that in the step 3);
after the correct digital sequence password is input, the entrance guard controller controls the electric control lock to unlock, and simultaneously controls the rotation angle p of the stepping motor, wherein the angle p is an integral multiple of 36 degrees, and the rotation angles of the stepping motor are different every time.
Strip-shaped air inlet holes 21 are uniformly formed in the front side wall of the front cover; an air inlet channel 13 which is communicated with the air inlet hole and the air inlet end of the centrifugal fan is formed at the lower part of the shell; and a lower air inlet 72 communicated with the ventilation cavity and the air outlet end of the centrifugal fan is formed at the lower end of the air inlet seat.
Sensor installation department front side is located the below shaping in every line ventilation hole and has circuit board mounting groove 41, fixed mounting has circuit board 5 in the circuit board mounting groove, infrared photoelectric sensor, baroceptor install on each circuit board nearby.
As shown in fig. 5 to 7, since the infrared photoelectric sensor is mounted on the left side of each vent hole, a photoelectric sensor mounting portion 411 is formed at a position on the left side of each vent hole in the front side of the sensor mounting portion.
And the infrared photoelectric sensor, the air pressure sensor, the centrifugal fan and the stepping motor are respectively and electrically connected with the access controller. The door controller, the infrared photoelectric sensor, the air pressure sensor, the centrifugal fan and the like are common components in the prior art, the invention is mainly characterized in that all the components are skillfully matched to realize the peep-proof function, and the electrical components are not creatively changed, and the invention belongs to the field which is easily realized by technical personnel according to the requirements, so that the specific circuits, programs and the like are not expanded and described.
The switching valve plate is coaxially and fixedly connected with an output shaft of the stepping motor, and a shaft hole for the output shaft of the stepping motor to penetrate through is formed in the air inlet seat; the angle of each rotation of the stepping motor is 36 x t, t is a pseudo random number generated by the entrance guard controller, and t is an integer within the range of 1-8.
3 second air inlets 12a communicated with the air vent cavity are formed in the inner front side wall of the shell below the first air inlet, and 3 second air vent grooves 12 respectively communicated with the second air inlets are formed in the outer front side wall of the shell; the 3 second vent grooves correspond to a "#" sign key, a "#" sign key and a doorbell key respectively.
The "#" sign key may be used when entering a set password, and the "#" sign key may be used for re-entering when the user finds the password entry error. These are prior art in this field and are not expanded herein.
The casing rear side is connected with the back lid, sensor installation department, casing, air inlet seat and back lid pass through bolt fixed connection, the protecgulum side is connected with the casing side through the screw.
The working principle of the invention is further illustrated by the following examples:
for example, the password is set to be 123654, the current position of the switching valve plate enables the induction air outlets corresponding to the numbers 1, 2, 4, 5, 7 and 8 to be communicated with the ventilation cavity, and the induction air outlets corresponding to the numbers 3, 5, 9 and 0 are not communicated with the ventilation cavity.
When the electric control lock is unlocked through the password input device, a finger is close to the induction air outlet corresponding to the number 1, the buzzer sounds one sound to prompt that the first password is input successfully, and meanwhile, the centrifugal fan starts to work;
then, a finger is close to the induction air outlet corresponding to the number 2, and the buzzer sounds to prompt that the second password is successfully input;
because the induction air outlet corresponding to the number 2 is blown out by air flow, then a finger is close to the induction air outlet corresponding to the number 4 (3 + 1), and the buzzer sounds to prompt that the third password is successfully input;
because the induction air outlet corresponding to the number 4 is blown out by air flow, a finger is close to the induction air outlet corresponding to the number 7 (6 + 1), and the buzzer sounds to prompt that the fourth password is successfully input;
because the induction air outlet corresponding to the number 7 is blown out by air flow, then a finger is close to the induction air outlet corresponding to the number 6 (5 + 1), and the buzzer sounds to prompt that the fifth password is successfully input;
since no airflow is blown out from the induction air outlet corresponding to the number 6, the finger is close to the induction air outlet corresponding to the number 4 again, and the buzzer sounds to prompt that the sixth password is successfully input.
In the present case, it can be seen that the set password is 123654, and the actual input password is 124764.
After the electric control lock is unlocked, it is assumed that the stepping motor controls the switching valve plate to rotate by 72 degrees, so that the induction air outlets corresponding to numbers 2, 3, 5, 6, 8 and 9 are communicated with the ventilation cavity, and the induction air outlets corresponding to numbers 1, 4, 7 and 0 are not communicated with the ventilation cavity (which induction air outlets give out air depending on the arrangement of the first ventilation grooves, the positions of the through holes of the switching valve plate and the rotation angle of the stepping motor, and the numerical values listed here are only convenient to understand and do not strictly correspond to the structure shown in the attached drawing).
When the electric control lock is unlocked through the password input device again, a finger is close to the induction air outlet corresponding to the number 1, the buzzer sounds one sound to prompt that the first password is input successfully, and meanwhile, the centrifugal fan starts to work;
then, a finger is close to the induction air outlet corresponding to the number 2, and the buzzer sounds to prompt that the second password is successfully input;
because the induction air outlet corresponding to the number 2 is blown out by air flow, then a finger is close to the induction air outlet corresponding to the number 4 (3 + 1), and the buzzer sounds to prompt that the third password is successfully input;
since no airflow is blown out from the induction air outlet corresponding to the number 4, a finger is close to the induction air outlet corresponding to the number 6, and the buzzer sounds to prompt that the fourth password is successfully input;
because the induction air outlet corresponding to the number 6 has air flow blown out, then the fingers are close to the induction air outlet corresponding to the number 6 again, the buzzer sounds one sound, and the fifth password is prompted to be successfully input;
because the induction air outlet corresponding to the number 6 has air flow blown out, then the finger is close to the induction air outlet corresponding to the number 5 (4 + 1) again, and the buzzer sounds to prompt that the sixth password is successfully input.
In the present case, it can be seen that the set password is 123654, and the actual input password is 124665.
By the above example, it can be known that the specific value input by one set password in different unlocking operations is different, so that even if someone peeks at the process of inputting the password by the user, the set password of the user cannot be known, and a higher security level is achieved.
It should be noted that the speed of the airflow blown out by the sensing air outlet should be such that the airflow does not make a sound when blowing onto the user's finger.
The password input device of the access control system realizes non-contact password input operation through an infrared photoelectric sensor and an air flow matched air pressure sensor, dynamically adjusts the input password according to the condition that whether the air outlet is induced to have air flow or not, realizes that the input values of the same set password are different when the password is input each time, can effectively prevent the password leakage caused by malicious peeking, and improves the security level of the password input device on the basis of not obviously improving the operation difficulty.
Specifically, the centrifugal fan is not operated when the password input device is in a standby state, and the input is realized through the infrared photoelectric sensor when a first password is input, and meanwhile, the centrifugal fan is triggered to operate; when the second password is input, the input is realized through an infrared photoelectric sensor, and whether the air outlet jets out air flow or not is sensed through fingers, so that the input value of the next password is judged; when the third password (and other subsequent passwords) is input, if the last password is input and airflow blows out from the induction air outlet, the input value of the third password (and other subsequent passwords) to be input is equal to the set value +1 of the current password, and if the last password is input and airflow does not blow out from the induction air outlet, the input value of the current password to be input is the set value of the current password. When the password is input at more than the third position, when the air flow is blown out from the induction air outlet at the corresponding position, the success of the input of the password at the position is confirmed only by the fact that the air pressure sensor and the infrared photoelectric sensor receive signals simultaneously. Because the password input device is in non-contact input, when the password input device is input, a finger triggers two infrared photoelectric sensors at the same time, and the probability of misoperation can be reduced by confirming the input through the air pressure sensor. In addition, because the air pressure detection end of the air pressure sensor is communicated with the air pressure sensor connection hole communicated with the side wall of the ventilation hole, when air flows through the ventilation hole, negative pressure is formed on the side wall of the ventilation hole due to Bernoulli effect, the air pressure sensor can judge which positions of the induction air outlets have air flows blown out by detecting the reduction of air pressure, whether the password input device is in a normal working state or not is convenient to confirm, the input password is ensured to be successfully compared with the set password after being input according to the set rule, and therefore unlocking is achieved.
Example 2
Referring to fig. 1 to 9, the present embodiment is a password input device for a building access control system, which includes a housing 1 and a front cover 2 fixedly connected to a front side of the housing.
The whole shell is in the shape of a rectangular groove with a backward opening, and 10 first air inlets 11a arranged in a circumferential array are formed in the front side wall surface in the shell; the improved air inlet valve is characterized in that an air inlet seat 7 is fixedly connected to the upper portion of the inner front side of the shell, a ventilation cavity 71 communicated with each first air inlet is formed in the front side of the air inlet seat, a centrifugal fan 8 is installed at the lower end of the air inlet seat in the shell, a switching valve plate 6 used for selectively shielding part of the first air inlets is installed in the ventilation cavity in a rotating mode, and a stepping motor 61 used for driving the switching valve plate to rotate is fixedly connected to the rear side of the air inlet seat.
A circular groove-shaped notch 14 is formed in the upper portion of the front side wall surface in the shell, each first air inlet is located in the range of the notch, and the circumference where each first air inlet is located is concentric with the notch; the switching valve plate is located in the range of the notch, and 4-6 through holes 601 capable of being simultaneously and respectively communicated with the first air inlets with equal quantity are formed in the switching valve plate.
The utility model discloses a set up induction air outlet, including protecgulum front side wall, be equipped with on the protecgulum front side wall and correspond each induction air outlet's position and be used for discerning the sign of the corresponding digital code key of each induction air outlet on the shaping of protecgulum front side wall with the response air outlet 22 that the rectangular array arranged, the position that corresponds each induction air outlet on the protecgulum front. The mark can be an upper convex or a lower concave Arabic number integrally formed on the front cover, and can also be a sticker printed with numbers.
Referring to fig. 6, 10 first ventilation grooves 11 respectively communicated with the first air inlets are formed in the front side wall surface of the housing, and the 10 first ventilation grooves respectively correspond to 10 digital cipher keys "0, 1, 2, 3, 4, 5, 6, 7, 8 and 9" one to one.
The whole rectangular channel shape that is the opening towards the back of protecgulum, fixed mounting has sensor installation department 4 between lateral wall before the casing is outer and the protecgulum in, and the shaping has the ventilation hole 42 that communicates each response air outlet and each first air channel one-to-one on the sensor installation department.
An air pressure sensor connecting hole 421 communicated with the side wall of each vent hole is formed in the sensor mounting part corresponding to the position of each vent hole; the sensor installation portion is provided with air pressure sensors 51 with the quantity of the air holes and the like, and the air pressure detection end of each air pressure sensor is communicated with the air pressure sensor connection holes. When airflow flows through the air vents and the induction air outlets are not blocked, the air pressure sensor detects negative pressure, so that the access controller can conveniently judge which induction air outlets are in the state of blowing the airflow; there is the air current to flow through at the ventilation hole, and when the response air outlet received and sheltered from, baroceptor detected the pressure increase, and the access control ware of being convenient for judges which response air outlet is sheltered from (input the password promptly).
The set pressure value of the air pressure sensor (when the measured pressure value is larger than the set pressure value, an input signal is considered to be arranged at the corresponding position) or/and the power (airflow speed) of the centrifugal fan are/is adjusted through the access controller, so that when the distance between the fingers and the induction air outlet is smaller than 10mm, the access controller receives the input signal.
The position of the sensor installation part adjacent to each ventilation hole is provided with an infrared photoelectric sensor respectively, and the position of the front cover corresponding to each infrared photoelectric sensor is provided with a through hole or a light-transmitting piece.
When the light-transmitting sheet portion is mounted on the front cover, the front cover may be integrally formed of transparent plastic and then painted at portions other than the light-transmitting sheet portion. Or the transparent plastic is firstly molded by injection molding, then secondary injection molding is carried out, and a layer of non-transparent plastic is injected on the other parts except the light-transmitting sheet part.
The distance between the induction air outlet and the infrared photoelectric sensor at the corresponding position is required to satisfy the following conditions: the infrared photoelectric sensor at the corresponding position can detect signals when the finger is close to the induction air outlet. Specifically, the induction air outlet and the infrared photoelectric sensor are located within a range of 1 square centimeter.
And a buzzer for prompting input information is arranged in the shell.
When the password input device inputs the number sequence password with more than 5 bits, the password is input in the following mode:
1) when a finger approaches an induction air outlet corresponding to a first digit of a password set value, an infrared photoelectric sensor at a corresponding position detects a signal, and a buzzer sounds to prompt that a first password is successfully input; at the same time, the centrifugal fan starts to work;
2) then, a finger approaches an induction air outlet corresponding to a second digit of the password set value, an infrared photoelectric sensor in a corresponding position detects a signal, and a buzzer sounds to prompt that the second digit of the password is successfully input;
3) the input value of the third password is determined by the state of the corresponding induction air outlet when the password set value and the second password are input;
3.1) if the air flow is blown out from the induction air outlet in the step 2), the input value of the third password to be input is equal to the set value +1 of the third password, and if the set value of the third password is 9, the input value of the third password is 0;
when a finger approaches an induction air outlet corresponding to a third password input value, the air pressure sensor at the corresponding position detects the increase of air pressure, the infrared photoelectric sensors at the corresponding positions detect signals, and the buzzer sounds to prompt that the third password is successfully input;
3.2) if no air current is blown out from the induction air outlet in the step 2), the input value of the third password to be input is the set value of the third password;
when a finger approaches an induction air outlet corresponding to the third password input value, an infrared photoelectric sensor at a corresponding position detects a signal, and a buzzer sounds to prompt that the third password is successfully input;
4) the password input value of the subsequent digit is determined by the password set value and the state of the corresponding induction air outlet when the last password is input; the input rule is the same as that in the step 3);
after the correct digital sequence password is input, the entrance guard controller controls the electric control lock to unlock, and simultaneously controls the rotation angle p of the stepping motor, wherein the angle p is an integral multiple of 36 degrees, and the rotation angles of the stepping motor are different every time.
Example 3
The present embodiment is modified from embodiment 1 as follows: the access controller is also connected with a monitoring camera, and the password input device is positioned in a monitoring area of the monitoring camera; when the monitoring camera shoots that the number of people in the monitoring area is larger than 1, inputting a password according to the mode of the embodiment 1; when the number of people in the monitoring area shot by the monitoring camera is equal to 1, the input password is consistent with the set password, and the centrifugal fan is not started after the first password is input.
The password input device can be internally provided with a voice prompt module for prompting to input a dynamic password when the number of people in the monitoring area shot by the monitoring camera is more than 1, and prompting to input a set password when the number of people in the monitoring area shot by the monitoring camera is equal to 1.
The improvement of the embodiment ensures that the set password is used for unlocking the electric control lock under the condition that the password is not peeped, thereby simplifying the password input mode; the high security input method of example 1 was used when there was a risk of being peeked.
Claims (7)
1. The utility model provides a building access control system, is including being used for the electric control lock that the control door body opened, closed, installs the button of going out that is used for controlling the electric control lock unblock on indoor lateral wall, installs the password input unit that is used for controlling the electric control lock unblock on outdoor lateral wall, electric control lock, the button of going out and password input unit are connected its characterized in that with access control controller electricity respectively:
the password input device comprises a shell and a front cover fixedly connected to the front side of the shell;
the whole shell is in the shape of a rectangular groove with a backward opening, and 10 first air inlets distributed in a circumferential array are formed in the front side wall surface in the shell; an air inlet seat is fixedly connected to the upper portion of the front side in the shell, a ventilation cavity communicated with each first air inlet is formed in the front side of the air inlet seat, a centrifugal fan is mounted at the lower end of the air inlet seat in the shell, a switching valve plate used for selectively shielding part of the first air inlets is rotatably mounted in the ventilation cavity, and a stepping motor used for driving the switching valve plate to rotate is fixedly connected to the rear side of the air inlet seat;
induction air outlets arranged in a rectangular array are formed in the front side wall of the front cover, and marks for identifying the number password keys corresponding to the induction air outlets are arranged at positions corresponding to the induction air outlets on the front side wall of the front cover;
the front side wall surface of the shell is provided with 10 first air grooves which are respectively communicated with the first air inlets, and the 10 first air grooves are respectively in one-to-one correspondence with 10 digital cipher keys '0, 1, 2, 3, 4, 5, 6, 7, 8 and 9';
the whole front cover is in the shape of a rectangular groove with a backward opening, a sensor mounting part is fixedly mounted between the front side wall outside the shell and the front side wall inside the front cover, and ventilation holes which are communicated with the induction air outlets and the first ventilation grooves in a one-to-one correspondence mode are formed in the sensor mounting part;
an air pressure sensor connecting hole communicated with the side wall of each vent hole is formed in the sensor mounting part corresponding to the position of each vent hole; the sensor mounting part is provided with air pressure sensors with the same number as the air vents, and the air pressure detection end of each air pressure sensor is communicated with the air pressure sensor connection holes;
the sensor mounting part is respectively provided with an infrared photoelectric sensor at the position adjacent to each vent hole, and the front cover is provided with a through hole or a light-transmitting piece part corresponding to each infrared photoelectric sensor;
the distance between the induction air outlet and the infrared photoelectric sensor at the corresponding position is required to satisfy the following conditions: when a finger approaches the induction air outlet, the infrared photoelectric sensor at the corresponding position can detect a signal;
a buzzer for prompting input information is arranged in the shell;
when the password input device inputs the number sequence password with more than 5 bits, the password is input in the following mode:
1) when a finger approaches an induction air outlet corresponding to a first digit of a password set value, an infrared photoelectric sensor at a corresponding position detects a signal, and a buzzer sounds to prompt that a first password is successfully input; at the same time, the centrifugal fan starts to work;
2) then, a finger approaches an induction air outlet corresponding to a second digit of the password set value, an infrared photoelectric sensor in a corresponding position detects a signal, and a buzzer sounds to prompt that the second digit of the password is successfully input;
3) the input value of the third password is determined by the state of the corresponding induction air outlet when the password set value and the second password are input;
3.1) if the air flow is blown out from the induction air outlet in the step 2), the input value of the third password to be input is equal to the set value +1 of the third password, and if the set value of the third password is 9, the input value of the third password is 0;
when a finger approaches an induction air outlet corresponding to a third password input value, the air pressure sensor at the corresponding position detects the increase of air pressure, the infrared photoelectric sensors at the corresponding positions detect signals, and the buzzer sounds to prompt that the third password is successfully input;
3.2) if no air current is blown out from the induction air outlet in the step 2), the input value of the third password to be input is the set value of the third password;
when a finger approaches an induction air outlet corresponding to the third password input value, an infrared photoelectric sensor at a corresponding position detects a signal, and a buzzer sounds to prompt that the third password is successfully input;
4) the password input value of the subsequent digit is determined by the password set value and the state of the corresponding induction air outlet when the last password is input; the input rule is the same as that in the step 3);
after the correct digital sequence password is input, the entrance guard controller controls the electric control lock to unlock, and simultaneously controls the rotation angle p of the stepping motor, wherein the angle p is an integral multiple of 36 degrees, and the rotation angles of the stepping motor are different every time.
2. A building access control system as claimed in claim 1, wherein: a circular groove-shaped notch is formed in the upper portion of the front side wall surface in the shell, each first air inlet is located in the range of the notch, and the circumference where each first air inlet is located is concentric with the notch; the switching valve plate is located in the range of the notch, and 4-6 through holes capable of being communicated with the first air inlets in equal quantity are formed in the switching valve plate.
3. A building access control system as claimed in claim 1, wherein: strip-shaped air inlet holes are uniformly formed in the front side wall of the front cover; an air inlet channel communicated with the air inlet hole and the air inlet end of the centrifugal fan is formed at the lower part of the shell; and a lower air inlet communicated with the ventilation cavity and the air outlet end of the centrifugal fan is formed at the lower end of the air inlet seat.
4. A building access control system as claimed in claim 1, wherein: the front side of the sensor mounting part is positioned below each row of ventilation holes to form a circuit board mounting groove, a circuit board is fixedly mounted in the circuit board mounting groove, and the infrared photoelectric sensor and the air pressure sensor are mounted on each circuit board nearby;
and the infrared photoelectric sensor, the air pressure sensor, the centrifugal fan and the stepping motor are respectively and electrically connected with the access controller.
5. A building access control system as claimed in claim 1, wherein: the switching valve plate is coaxially and fixedly connected with an output shaft of the stepping motor, and a shaft hole for the output shaft of the stepping motor to penetrate through is formed in the air inlet seat; the angle of each rotation of the stepping motor is 36 x t, t is a pseudo random number generated by the entrance guard controller, and t is an integer within the range of 1-8.
6. A building access control system as claimed in claim 1, wherein: 3 second air inlets communicated with the air vent cavity are formed in the front side wall of the shell below the first air inlet, and 3 second air vent grooves communicated with the second air inlets are formed in the front side wall of the shell; the 3 second vent grooves correspond to a "#" sign key, a "#" sign key and a doorbell key respectively.
7. A building access control system as claimed in claim 1, wherein: the casing rear side is connected with the back lid, sensor installation department, casing, air inlet seat and back lid pass through bolt fixed connection, the protecgulum side is connected with the casing side through the screw.
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Effective date of registration: 20201029 Address after: No. 617, Lijiagou village, Heshun Town, Linzhou City, Anyang City, Henan Province Applicant after: Wang Rui Address before: Hangzhou City, Zhejiang Province, 310051 Binjiang District West Street Road No. 11 Building 5 poly 1 layer -10 Applicant before: HANGZHOU LIPU TECHNOLOGY Co.,Ltd. |
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