CN110029873A - A kind of the laboratory multifunctional lock and its control method of network-control - Google Patents

Abstract

The invention relates to a network-controlled laboratory multifunctional lock and a control method thereof, belonging to the technical field of locks. The multifunctional lock comprises a lock fixing plate, a lock housing, a lock tongue, a lock sleeve matched with the lock tongue, A driving device and a controller, the lock housing is fixedly connected to the lock fixing plate, the lock tongue is slidably arranged in the lock housing, the driving device is arranged in the lock housing, and the lock tongue is slidably arranged in the lock housing. One end is drivingly connected with the drive device, the other end of the lock tongue slides out of the lock housing and is placed in the lock sleeve, the controller is fixed on the outer side wall of the lock housing and is connected with the lock housing. The driving device is electrically connected, and the controller is electrically connected to an external computer. The beneficial effect of the multifunctional lock of the present invention is that the lock is driven by electric energy to automatically open or lock the door of the laboratory, and it does not require too many management personnel to operate.

Description

A network-controlled laboratory multi-function lock and its control method

technical field

The invention belongs to the technical field of locks, and in particular relates to a network-controlled laboratory multifunctional lock and a control method thereof.

Background technique

There are many laboratories in colleges and universities, and there are a large number of experimental equipment in the implementation room, and different experimental equipment has different values, some of which are worth tens of thousands to hundreds of thousands. Theft, so the door to the laboratory must be locked. However, the use of laboratories in colleges and universities is aimed at ordinary students, scientific research teacher teams and postgraduates, etc. The complex users are not convenient for the school to manage the laboratories in a unified manner. It is necessary to assign relevant laboratory managers to open and close the laboratory doors. Since there are laboratories in different colleges, and the locations of the laboratories are not in the same location, it is necessary to have a lot of laboratory managers to manage the laboratories. When different people use it, they need to find a separate laboratory management People come to open the door of the laboratory, which leads to inconvenience, time-consuming and labor-intensive, and high labor costs in colleges and universities.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problems, the present invention provides a network-controlled laboratory multi-function lock and a control method thereof. The lock is driven by electric energy to automatically open or lock the laboratory door, and does not require too many management personnel to operate.

The technical solution of the present invention to solve the above technical problems is as follows: a network-controlled laboratory multi-function lock, comprising a lock fixture fixing plate, a lock fixture shell, a lock tongue, a lock sleeve matched with the lock tongue, a driving device and a controller, The lock housing is fixedly connected to the lock fixing plate, the lock tongue is slidably arranged in the lock housing, the driving device is arranged in the lock housing, and one end of the lock tongue is connected to the driving device Drive connection, the other end of the lock tongue slides out of the lock housing and is placed in the lock sleeve, the controller is fixed on the outer side wall of the lock housing and is electrically connected with the driving device , the controller is electrically connected with an external computer.

The beneficial effects of the multi-function lock of the present invention are: the multi-function lock can drive the lock to open or close through electric energy, thereby realizing the locking or opening of the laboratory door, which is very convenient to use, and can be reserved for use on the computer at the same time Time, the computer automatically controls the lock to open the laboratory door according to the appointment time, and automatically locks the laboratory door after use, saving the user's time, and at the same time, it does not require too many managers to manage the laboratory, saving efficient labor costs .

On the basis of the above technical solutions, the present invention can also be improved as follows.

Further, the lock housing is provided with a lock inner cavity, and one end of the lock housing close to the lock sleeve is fixedly connected with a lock tongue to define a housing, and a lock tongue sliding channel is arranged in the lock tongue limitation housing, and the lock tongue The sliding channel is connected with the inner cavity of the lock, the lock tongue slides back and forth in the inner cavity of the lock and the sliding channel of the lock tongue, and the driving device is fixedly arranged in the inner cavity of the lock.

The beneficial effect of adopting the above-mentioned further solution is that the lock tongue is limited to move in a straight line by limiting the casing, and the lock tongue can be accurately inserted into the lock sleeve to avoid the locking failure caused by the left and right movement of the lock tongue.

Further, the lock sleeve is provided with a locking groove for the lock tongue to slide in, and the locking groove is arranged opposite to the lock tongue sliding channel.

The beneficial effect of adopting the above-mentioned further solution is that when locking is required, the locking tongue can be better fixed by the locking groove.

Further, a rechargeable battery is fixed on the outer side wall of the lock housing, one side of the rechargeable battery is fixedly connected to the controller, the rechargeable battery is electrically connected to the controller, and the rechargeable battery is connected to an external power source electrical connection.

The beneficial effect of adopting the above-mentioned further scheme is that when a power failure occurs, the controller can be backed up by a rechargeable battery.

Further, the driving device includes a motor and a screw rod, the motor is fixedly connected in the inner cavity of the lock, one end of the screw rod is fixedly connected with the output end of the motor, and the other end is connected with the inner cavity of the lock. The inner walls are arranged at intervals, and one end of the locking tongue is screwed on the screw rod.

The beneficial effect of adopting the above-mentioned further scheme is that the bolt is moved relative to the bolt by the rotation of the screw driven by the motor, so as to realize the extension or retraction of the lock casing, which is convenient and quick, and has a simple structure and is easy to manufacture and maintain.

Further, a lock tongue limit block for preventing the lock tongue from colliding with the motor is fixedly sleeved on one end of the screw rod close to the motor.

The beneficial effect of adopting the above-mentioned further solution is to prevent the lock tongue from moving too much and colliding with the motor, which causes the lock to be damaged.

Further, the lock housing is provided with a first fixing pin hole and a motor fixing pin for fixing the motor, and the motor is provided with a second fixing pin hole that communicates with the first fixing pin hole, so One end of the motor fixing pin passes through the first fixing pin hole and is placed in the second fixing pin hole.

The beneficial effect of adopting the above-mentioned further scheme is that the fixing effect of the motor is better.

Further, the lock housing is provided with a Hall sensor for detecting whether the laboratory door is closed, the lock sleeve is provided with a magnetic induction sheet matched with the Hall sensor, and one side of the lock housing is fixedly connected with a a first fixed vertical plate, the Hall sensor is fixedly connected to the first fixed vertical plate, the lock sleeve is fixedly connected with a second fixed vertical plate opposite to the first fixed vertical plate, the The magnetic induction sheet is fixedly connected to the second fixed vertical plate, and the Hall sensor is electrically connected to the controller.

The beneficial effect of adopting the above-mentioned further scheme is: whether the laboratory door is closed is detected by the cooperation of the Hall sensor and the magnetic induction sheet, so as to ensure that the lock tongue is inserted into the lock sleeve to lock the door.

Further, it also includes a card swiping terminal, the card swiping terminal is fixed on the laboratory door, and the card swiping terminal is electrically connected to the controller.

The beneficial effect of adopting the above-mentioned further scheme is that the teacher can open or close the lock through the prefabricated card, which is more convenient to use.

The present invention also provides a method for controlling the laboratory multi-function lock using the network control, which is characterized in that it comprises the following steps:

S1. The user logs in to the reservation system on the computer and makes reservations for the use time of the laboratory;

S2, when the time reaches the time set by the reservation in step S1, the computer remotely sends an unlocking instruction to the controller;

S3. After the controller receives the unlocking instruction, it controls the drive device to recover the lock tongue, the door of the implementation room is opened before the user comes to the laboratory, and the user can directly enter the laboratory;

S4. After the user finishes using the laboratory, the laboratory door is closed after leaving the laboratory. After the scheduled use time arrives, the computer remotely sends a lock instruction to the controller, and the controller controls the lock to lock the laboratory door.

The beneficial effect of this convenient control is that users such as teachers or students log in to the reservation system with their own accounts, and make reservations for the use time of the laboratory. After the reservation is completed, the user only needs to go to the corresponding laboratory according to the time, and the lock is automatically opened. , Close the door of the laboratory after use according to the time, the lock will automatically lock the door, which makes the university strengthen the management of the laboratory and reduce the cost of management personnel.

Description of drawings

Fig. 1 is the three-dimensional schematic diagram of the multi-function lock of the present invention;

2 is an exploded view of the multifunctional lock of the present invention;

Fig. 3 is the top view of the multifunctional lock of the present invention;

Fig. 4 is the sectional view of the locked state of the multi-function lock of the present invention;

FIG. 5 is a sectional view of the unlocked state of the multi-function lock of the present invention.

In the accompanying drawings, the list of components represented by each number is as follows:

1. Rechargeable battery, 2. Controller, 3. Lock housing, 4. Motor fixing pin, 5. Motor, 6. Lock tongue limit block, 7. Screw rod, 8. Lock tongue, 9, Lock sleeve, 10, Magnetic induction sheet, 11, Hall sensor, 12, inner cavity of lock, 13, first fixing pin hole, 14, second fixing pin hole, 15, first fixing riser, 16, second fixing riser, 17, lock The tongue defines the housing, 18, the lock fixing plate, 19, the locking groove, 20, the lock tongue sliding channel.

Detailed ways

The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not to limit the scope of the present invention.

Example

As shown in FIGS. 1-5 , this embodiment provides a network-controlled laboratory multi-function lock, which includes a lock fixing plate 18 , a lock housing 3 , a lock tongue 8 , a lock sleeve 9 matched with the lock tongue 8 , and a driving device With the controller 2, the lock housing 3 is welded and fixedly connected to one side of the lock fixing plate 18. The lock fixing plate 18 is provided with a plurality of threaded holes, and the lock fixing plate 18 is fixedly connected to the laboratory through the cooperation of the screws and the threaded holes. On the door, the lock tongue 8 is slidably arranged in the lock housing 3, the lock tongue 8 can slide in the lock housing 3, the driving device is arranged in the lock housing 3, one end of the lock tongue 8 is connected with the driving device, and the other side of the lock tongue 8 is connected to the driving device. One end slides out from the lock housing 3 and is placed in the lock sleeve 9. The lock sleeve 9 is also provided with a plurality of threaded holes, and the lock sleeve 9 is fixedly connected to the laboratory door sleeve through the cooperation of the screws and the threaded holes. The device drives the lock tongue 8 to slide in the lock housing 3, and makes one end of the lock tongue 8 slide out and retract the lock housing 3. When one end of the lock tongue 8 slides out of the lock housing 3 and is placed in the lock sleeve 9, the lock housing 3 is integrated with the lock sleeve 9, so that the laboratory door is locked, when one end of the lock bolt 8 is retracted into the lock housing 3, the laboratory door is not locked and can be opened; the controller 2 is fixed on the lock housing 3 On the outer side wall of the device and electrically connected with the drive device, the drive device is controlled to start and close through the controller 2, the controller 2 is electrically connected with the external computer, the controller 2 can receive the instructions transmitted by the computer through the network, and make corresponding actions , the computer contains a reservation system, the reservation system is an existing technology, and the use time of the laboratory can be reserved through the reservation system. The controller 2 is a single-chip microcomputer, which is an existing technology.

Specifically, the lock housing 3 is provided with a lock cavity 12, and one end of the lock housing 3 close to the lock sleeve 9 is fixedly connected with a lock tongue limiting housing 17, and a lock tongue sliding channel 20 is provided in the lock tongue limiting housing 17, and the lock tongue sliding channel 20 is connected to the inner cavity 12 of the lock, and the lock tongue 8 slides back and forth in the inner cavity 12 of the lock and the sliding channel 20 of the lock tongue. Move left and right, so that the lock tongue 8 cannot enter the lock sleeve 9, the driving device is fixed in the inner cavity 12 of the lock, one end of the lock tongue 8 is connected with the driving device, and the other end slides in the lock tongue sliding channel 20 to drive The device driving bolt 8 can be slid out of the bolt sliding channel 20 and inserted into the lock sleeve 9 .

Preferably, the lock sleeve 9 is provided with a locking groove 19 for the lock tongue 8 to slide into, the locking groove 19 is arranged opposite to the lock tongue sliding channel 20, the locking groove 19 communicates with the lock tongue sliding channel 20, and the lock tongue 8 slides After exiting the lock tongue sliding channel 20, it slides into the locking groove 19, and the laboratory door is locked at this time.

Preferably, a rechargeable battery 1 is also fixedly arranged on the outer side wall of the lock housing 3, and the rechargeable battery 1 is a lithium battery. It is electrically connected to the external power supply. During normal use, the controller 2 is powered by the external power supply, and the rechargeable battery 1 is fully charged. When a power failure occurs, the rechargeable battery 1 can supply power to the controller 2, and the use time can be maintained for 1- Two weeks.

Specifically, the driving device includes a motor 5 and a lead screw 7. The motor 5 is integrated with a reducer, which can control the speed smoothly. The motor 5 is a small servo motor. The motor 5 can rotate clockwise and counterclockwise according to Connected in the inner cavity 12 of the lock, one end of the screw 7 is fixedly connected with the output end of the motor 5, and the other end is spaced from the inner wall of the inner cavity 12 of the lock, and the rotation of the screw 7 is driven by the motor 5. There are threads, and one end of the lock tongue 8 is threadedly connected to the screw rod 7. Specifically, the lock tongue 8 is an "L" shape, the screw rod 7 is located vertically above the lock tongue 8, and the long end of the lock tongue 8 is placed in the sliding channel. Inside, the short end is threadedly connected with the screw rod 7. When the screw rod 7 rotates, since the lock tongue 8 is limited to the lock tongue sliding channel 20, it cannot rotate with the screw rod 7 at the same time, so that when the screw rod 7 rotates, The lock tongue 8 can be moved relative to the screw rod 7, so as to drive the lock tongue 8 to slide in the lock tongue sliding channel 20, so as to realize the effect of locking the laboratory door and opening the laboratory door. One end is arranged to be in contact with the inner wall of the inner cavity 12 of the lock device at intervals, so that the screw rod 7 is not affected by the inner wall of the inner cavity 12 of the lock device when rotating. Remaining on the screw rod 7 , the lock tongue 8 is in contact with the inner wall of the inner cavity 12 of the lock and will not fall off from the screw rod 7 .

Preferably, one end of the screw rod 7 close to the motor 5 is fixedly sleeved with a lock tongue limit block 6 for preventing the lock tongue 8 from colliding with the motor 5 , and the lock tongue limit block 6 is located between the lock tongue 8 and the motor 5 to prevent the lock tongue 8 from colliding with the motor 5 . When the deadbolt 8 moves toward the motor 5 , it moves too much and collides with the motor 5 to cause damage to the motor 5 , and also prevents the deadbolt 8 from sliding down the deadbolt sliding channel 20 and damages the lock. Specifically, when the motor 5 controls the lock tongue 8 to move, when the lock tongue 8 moves to contact with the inner wall of the inner cavity 12 of the lock or contact with the lock tongue limit block 6, the lock tongue 8 cannot continue to move. When the current increases, the controller 2 controls the motor 5 to turn off after detecting that the current of the motor 5 increases.

Specifically, the lock housing 3 is provided with a first fixing pin hole 13 and a motor fixing pin 4 for fixing the motor 5 , and the motor 5 is provided with a second fixing pin hole 14 that communicates with the first fixing pin hole 13 . One end of the fixing pin 4 passes through the first fixing pin hole 13 and is placed in the second fixing pin hole 14 , and the motor 5 is fixed to the lock housing by inserting the fixing pin into the first fixing pin hole 13 and the second fixing pin hole 14 3, to avoid the random movement of the motor 5, which will affect the movement of the lock tongue 8.

Preferably, the lock housing 3 is provided with a Hall sensor 11 for detecting whether the laboratory door is closed. The Hall sensor 11 is a magnetic field sensor made according to the Hall effect and is in the prior art, and the specific structure and principle will not be detailed in detail. It is described that the lock sleeve 9 is provided with a magnetic induction sheet 10 matched with the Hall sensor 11. When the laboratory door is in a closed state, the magnetic induction sheet 10 is opposite to the Hall sensor 11, and the Hall sensor 11 can detect the magnetic induction sheet 10. A first fixed vertical plate 15 is fixedly connected to one side of the lock housing 3 , the Hall sensor 11 is fixedly connected to the first fixed vertical plate 15 , and the lock sleeve 9 is fixedly connected to a second fixed vertical plate 15 opposite to the first fixed vertical plate 15 . The vertical plate 16 is fixed, the magnetic induction sheet 10 is fixedly connected to the second fixed vertical plate 16, and the Hall sensor 11 is electrically connected with the controller 2. When the Hall sensor 11 detects the magnetic induction sheet 10, it is fed back to the controller 2 to control the After receiving the door lock instruction, the device 2 can push out the latch 8 to lock the door. When the Hall sensor 11 does not detect the magnetic induction sheet 10 and no feedback signal is sent to the controller 2, after the controller 2 receives the door lock instruction, The lock tongue 8 will not be pushed out, and the signal that the door cannot be locked will be fed back to the computer, and an abnormal signal will be reported, and the supervisor can send the manager to check it quickly.

Preferably, the multi-function lock also includes a card swiping terminal, which is fixed on the laboratory door, and is electrically connected to the controller 2. The card swiping terminal is in the prior art, and the specific structure and principle will not be described in detail. The card is close to the card terminal to identify the identity. The prefabricated card is an IC, which is identified by the non-contact radio frequency signal, so that the lock is opened, so that the laboratory door can be opened. This technology is also the existing technology, and those skilled in the art have already Technology.

The present embodiment also provides a method for controlling a laboratory multi-function lock using the above network control, which specifically includes the following steps:

S1. The user logs in to the reservation system on the computer to make reservations for the use time of the laboratory. Different users correspond to different account information and can log in to the network through their own computer, which is more convenient to use. The reservation system is divided into two types, one In order for teachers in class to be able to import course information according to the actual teaching courses, it is convenient for teachers to quickly reserve the use time of the laboratory according to the course. The reservation system is connected to the entire efficient laboratory, and can make all laboratory reservations. At the same time, the reservation system can record the use of the laboratory, which is convenient for the later management of the laboratory;

S2, when the time reaches the time set by the reservation in step S1, the computer sends an unlock instruction to the controller 2 of the multi-function lock corresponding to the laboratory remotely through the network;

S3. After the controller 2 receives the unlocking instruction, the controller 2 controls the motor 5 to rotate, and the lock tongue 8 is recovered from the locking groove 19 on the lock sleeve 9 into the lock tongue sliding channel 20, so that the lock housing 3 and the lock sleeve 9 are formed. Separation, the door of the implementation room is opened before the user comes to the laboratory, and the user can directly enter the laboratory after coming to the laboratory, and it is no longer necessary to find the corresponding manager to open the door, which saves a lot of time;

S4. After the user finishes using the laboratory, he/she closes the laboratory door after leaving the laboratory. At the same time, when the reserved use time arrives, the computer will remotely send the lock command to the controller 2 through the network. After the controller 2 receives the lock command , the controller 2 controls the motor 5 to rotate, pushes the lock tongue 8 out of the lock tongue sliding channel 20 and places it in the locking groove 19 of the lock sleeve 9, at this time the laboratory door is locked.

Preferably, when the multi-function lock is provided with the Hall sensor 11 and the magnetic induction sheet 10, the Hall sensor 11 and the magnetic induction sheet 10 can cooperate to detect whether the laboratory door is closed. For step S4, when the Hall sensor 11 is used to detect When the magnetic induction sheet 10 is reached, when the controller 2 does not receive the feedback signal, after the controller 2 receives the door locking instruction, it will not push out the lock bolt 8, and will feed back the signal that the door cannot be locked to the computer, and report an abnormality. When the Hall sensor 11 detects the magnetic induction sheet 10, it is fed back to the controller 2, and the controller 2 can only push out the latch 8 to lock the door after receiving the door locking instruction. live.

Preferably, when the multi-function lock is equipped with a credit card terminal, the user can also open the laboratory door through the cooperation of the prefabricated card and the credit card terminal. The device 2 feeds back the information to the computer teacher's curriculum system. Compared with the curriculum system, after the information matches, the computer sends an unlock instruction to the controller 2, and the controller 2 controls the lock to open, so that the laboratory door is opened and the teacher can use the laboratory.

Preferably, a laboratory door can be provided with multiple multi-function locks, and the locking effect is better.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. Inside.

Claims (10)

1. a kind of laboratory multifunctional lock of network-control, which is characterized in that including lockset fixed plate (18), lockset shell (3), Lock tongue (8), the lock tube (9) matched with the lock tongue (8), driving device and controller (2), the lockset shell (3) are fixed It is connected on the lockset fixed plate (18), lock tongue (8) sliding is located in the lockset shell (3), the driving device Be located in the lockset shell (3), one end of the lock tongue (8) and the driving device are sequentially connected, the lock tongue (8) it is another One end sliding out of described lockset shell (3), which is pierced by, to be placed in the lock tube (9), and controller (2) fixation is located at the lock Have on the lateral wall of shell (3) and be electrically connected with the driving device, the controller (2) is electrically connected with outer computer.

2. a kind of laboratory multifunctional lock of network-control according to claim 1, which is characterized in that the lockset shell (3) lockset inner cavity (12) are equipped in, the lockset shell (3) is fixedly connected with lock tongue restriction close to the lock tube (9) one end Shell (17), the lock tongue, which limits, is equipped with lock tongue sliding channel (20), the lock tongue sliding channel (20) and institute in shell (17) Lockset inner cavity (12) connection is stated, the lock tongue (8) slidably reciprocates in the lockset inner cavity (12) and the lock tongue sliding channel (20) in, the driving device is fixed to be located in the lockset inner cavity (12).

3. a kind of laboratory multifunctional lock of network-control according to claim 2, which is characterized in that the lock tube (9) Interior be equipped with the lock slots (19) slid into for the lock tongue (8), the lock slots (19) and the lock tongue sliding channel (20) It is oppositely arranged.

4. a kind of laboratory multifunctional lock of network-control according to claim 1, which is characterized in that the lockset shell (3) it is also fixed on lateral wall rechargeable battery (1), rechargeable battery (1) side and the controller (2) fixed company It connects, the rechargeable battery (1) is electrically connected with the controller (2), and the rechargeable battery (1) is electrically connected with external power supply.

5. a kind of laboratory multifunctional lock of network-control according to claim 1, which is characterized in that the driving device Including motor (5) and screw rod (7), the motor (5) is fixedly connected in the lockset inner cavity (12), and the one of the screw rod (7) End is fixedly connected with the output end of the motor (5), and the inner wall interval of the other end and the lockset inner cavity (12) is arranged, the lock The threaded one end of tongue (8) is connected on the screw rod (7).

6. a kind of laboratory multifunctional lock of network-control according to claim 5, which is characterized in that the screw rod (7) Fixing sleeve is equipped with the lock tongue for preventing the lock tongue (8) and the motor (5) from colliding and limits on the one end of the motor (5) Position block (6).

7. a kind of laboratory multifunctional lock of network-control according to claim 6, which is characterized in that the lockset shell (3) be equipped with the first fixed pin holes (13) and motor fixed pin (4) for fixing the motor (5), on the motor (5) Equipped with the second fixed pin holes (14) to connect with first fixed pin holes (13), one end of the motor fixed pin (4) is worn First fixed pin holes (13) are crossed to be placed in second fixed pin holes (14).

8. a kind of laboratory multifunctional lock of network-control according to claim 1-7, which is characterized in that described Lockset shell (3) is equipped with for the Hall sensor (11) whether closed of testing laboratory's door, the lock tube (9) be equipped with The magnetic inductive film (10) that the Hall sensor (11) matches, it is solid that the side of the lockset shell (3) is fixedly connected with first Determine riser (15), the Hall sensor (11) is fixedly connected on first fixed vertical plate (15), solid on the lock tube (9) Surely it is connected with the second fixed vertical plate (16) being oppositely arranged with first fixed vertical plate (15), the magnetic inductive film (10) is fixed It is connected on second fixed vertical plate (16), the Hall sensor (11) is electrically connected with the controller (2).

9. a kind of laboratory multifunctional lock of network-control according to claim 8, which is characterized in that further include end of swiping the card End, the card swiping terminal are fixedly installed on the door of laboratory, and the card swiping terminal is electrically connected with the controller (2).

10. a kind of control method of the laboratory multifunctional lock of the network-control as described in claim any one of 1-9, feature exist In, comprising the following steps:

Reservation system on S1, user's log into thr computer reserves laboratory using the time；

S2, when the time reach step S1 in book setting time after, computer remote to controller issue unlocking instruction；

After S3, controller receive unlocking instruction, control driving device recycles lock tongue, implements room door in user and comes laboratory It is opened before, user can be directly entered laboratory；

After S4, user have used laboratory, laboratory door is closed after leaving laboratory, after reservation is reached using the time, is calculated Machine, which is remotely sent, shuts instruction to controller, and controller control lock lives laboratory door lock.