296 results about "Keyhole" patented technology

The present invention discloses an axial tolerance compensation arrangement 1 for the automatic compensation of tolerances between a first component A and a second component B, which has the following features: a nut element 10, preferably an annular nut element, with a radially outer fastening structure, in particular a bayonet structure, which can be fastened in a component opening 90, in particular a keyhole geometry, of the first component A, and an internal nut thread 22 of a first thread direction, a hollow screw 40 with a head 44 and a hollow cylindrical shank 42, which has on a radial outer side an adjusting thread 52 matching the nut thread 22 and on a radial inner side a fastening thread 56 with a second thread direction opposite to the first, which interacts with a fastening screw 80 of a second thread direction,so that the first component A and the second component B can be fastened to each other via the tolerance compensation arrangement 1, wherein the hollow cylindrical shaft 42 has a disassembly protection 60 at an axial end facing away from the head, which prevents the hollow screw 40 from being unscrewed from the nut element 10 during installation of the tolerance compensation arrangement 1.

The application provides a one-time forming electron beam welding method for a titanium alloy component with single-sided incidence and double-layer welds, which comprises the following steps: a closed cavity structure titanium alloy component is formed by a plurality of mutually shielded multi-layer thin plates through single-direction electron beam incidence; the focusing current of the electron beam is adjusted; the converging effect of the electromagnetic coil is changed to change the focus position, and then the electron beam keyhole depth and size are changed; the keyhole is adjusted to be an energy channel through which the electron beam passes; the electron beam energy can pass through the first layer of welds to reach the second layer of welds; the controllable linear energy is provided by combining the acceleration voltage, the welding current and the welding speed to ensure that the remaining energy that penetrates reaches the second layer of welds to complete the welding of the second layer of welds again; the low-frequency scanning is combined with the electron beam movement to drive the first layer of molten pool metal to flow and fill the rear channel, and the front channel is opened, so that the channel is dynamically smooth and stable, and the electron beam keyhole effect behavior is adjusted.

The utility model discloses a rail transit platform door isolation device, including and the mechanical isolation lock of lintel connection, and the isolation support of door leaf connection, mechanical isolation lock includes lock core, lock tongue, lock core front end connection lock tongue, and the keyhole that is equipped with for professional key access is equipped in the back, and lock core and lintel rotation is connected, forms mechanical isolation, and lock core drives lock tongue to rotate, and the clearance between door leaf is reduced, and the isolation support is prevented to cross lock tongue. Through setting lock core structure, prevent misoperation, and lock core drive lock tongue movement, prevent sliding door to slide, and sliding door can not open, on the basis of electric isolation, increase a safeguard, guarantee security.

This utility model discloses a car door lock structure and a car, including: an outer door panel with a lock hole; a door lock disposed inside the outer door panel; a lock cylinder assembly including a lock cylinder mounting base and a lock cylinder, the lock cylinder mounting base being disposed on the inner side of the outer door panel, the lock cylinder corresponding to the lock hole being disposed on the lock cylinder mounting base, the lock cylinder including a lock cylinder shell and a core body, the core body having a keyhole, the lock cylinder shell being pressably disposed on the lock cylinder mounting base, the lock cylinder mounting base having an unlocking switch that directly or indirectly cooperates with the lock cylinder shell, the unlocking switch being connected to the door lock for electronic unlocking; and a lock rod, one end of the lock rod being connected to the core body, the other end of the lock rod being connected to the door lock, the lock rod being able to rotate with the core body for mechanical unlocking. This utility model can be used for car door locks without door handles, and it is equipped with a double door opening switch, which can be used for both electronic unlocking and mechanical lock cylinder emergency unlocking. This utility model solves the problem that car door locks without door handles cannot be unlocked after a power failure, effectively improving system stability.

The anti-jamming lock cylinder comprises a lock shell, a lock container installed in the lock shell and a tail ruler assembly connected into the lock shell, a clutch assembly enabling the lock container to be separated from or combined with the tail ruler assembly is arranged between the lock container and the tail ruler assembly, and a key hole is formed in the lock container; when the key is not inserted into the key hole, the tail ruler assembly is separated from the clutch assembly and the lock cylinder; after the key is inserted into the key hole and gradually pushes the clutch assembly to enter the tail ruler assembly, the key is rotated, the lock container, the clutch assembly and the tail ruler assembly can coaxially and synchronously rotate, and the clutch assembly is in circumferential limiting fit with the lock container and the tail ruler assembly through a circumferential limiting structure. Due to the effect of the clutch assembly, the tail ruler assembly and the lock cylinder are in a separated state, even if foreign matter invades the key hole and blocks the key hole, the tail ruler assembly can still idle, motor burning or part damage caused by the foreign matter of a traditional lock cylinder is effectively avoided, and meanwhile the problem that indoor unlocking cannot be achieved due to the fact that a user forgets to pull out a key is solved.

The invention provides a rotating shaft balance structure based on topological optimization, the rotating shaft balance structure comprises an inner ring, measuring beams and an outer ring, the inner ring is provided with a key hole, and the inner ring and the outer ring are connected through a plurality of groups of measuring beams; a strain gauge is attached to the measuring beam and can sense deformation of the measuring beam, and six-component aerodynamic force borne by a measured object is converted into an electric signal to be output. The outer ring is of a hollow structure composed of beams with irregular surfaces and holes, and a plurality of mounting holes used for being connected with a tested device are formed in the outer ring in the circumferential direction. A topological optimization design is adopted for the outer ring of the rotating shaft balance to form a hollow structure consisting of beams and holes with irregular surfaces, so that the rotating shaft balance greatly reduces the mass of the outer ring while ensuring the design rigidity, and solves the problem that the resistance measurement error is relatively large due to rigidity hardening of a measurement beam caused by centrifugal force during high-speed rotation.

The utility model relates to the technical field of energy storage, in particular to a simple lock, a bottom support, a battery box and a battery changing system. The simple lock comprises a lock hole assembly and a lock body assembly. The lock body assembly comprises a supporting unit, a driving unit and two spring bolt units. The driving unit comprises a driving rod, a first left connecting rod, a second left connecting rod and a spring bolt unit which are hinged in sequence; and the driving rod, the first right connecting rod, the second right connecting rod and the other spring bolt unit are hinged in sequence. The driving rod drives the spring bolt unit to rotate through the connecting rod structure. When the simple lock is in a locking state, the spring bolt unit penetrates through the lock hole assembly, and the spring bolt unit abuts against the lock hole assembly to limit the lock hole assembly to move away from the spring bolt unit. The bottom support comprises a lock body assembly or a lock hole assembly. The battery box comprises a lock body assembly or a lock hole assembly. The battery replacing system comprises a bottom support and a battery box. Therefore, the problems of complex structure and high energy consumption of the traditional battery replacement locking device are solved.

This utility model provides an anti-side-knock lock and a lock kit. The anti-side-knock lock includes a lock body, a bolt, a lock cylinder assembly, a first reset member, a pin, and a second reset member. The lock cylinder assembly includes a rotor with an eccentric portion. The bolt has a locking position, and the first reset member cooperates with the bolt. Under the restoring force of the first reset member, the bolt tends to move towards a first position. The eccentric portion cooperates with the locking position, and the rotor rotation forces the bolt to move towards a second position. The bolt has a pin hole, and the second reset member and the pin are located in the pin hole. The pin restricts the movement of the bolt. The pusher includes a central post and a pusher. The lock cylinder assembly has a sliding hole along a first direction and located at the first axis, which connects to the keyhole. The central post is located in the sliding hole. The pusher, the pin, and the second reset member abut against the bolt in sequence. When the central post is pushed, the pin disengages from the lock body. The lock kit includes a lock and a key. This utility model reduces manufacturing difficulty and is applicable to lock types with a central keyhole.

A lock (10) suitable for different slots for electronic devices, which is used to lock an electronic device (20) and is unlocked with a key (30), characterized in that the lock (10) for electronic devices has a housing (11) which is composed of two housing units (111), wherein the housing (11) is externally connected to a safety cable (12) to fix the lock (10) in a location, wherein a first receiving chamber (13) and a second receiving chamber (14) are arranged inside the housing (11), wherein a first separating part (131) projects from the bottom of the first receiving chamber (13) and a second separating part (141) projects from the upper part of the second receiving chamber (14), wherein a keyhole (142) is arranged on the second receiving chamber (14) which passes through the bottom of the second receiving chamber (14).wherein a third receiving chamber (15) is arranged between the first separating part (13) and the second separating part (14), in which a slide (151) is arranged through which a through-opening (1511) passes, wherein a first spring (152) is arranged between the slide (151) and the housing (11), wherein a locking element (16) is rotatably mounted next to the first receiving chamber (13), on which at least one sawtooth-shaped first locking edge (152) is projecting, wherein a second spring (162) is arranged between the locking element (16) and the housing (11), wherein a locking cylinder (17) is attached in the second receiving chamber (14), in the center of which a cylinder shaft (171) is rotatably mounted, wherein a flange (711) is arranged in the middle section of the cylinder shaft (171) such that it projects outwards, wherein the middle section of the cylinder shaft (171) passes through the through-opening (1511) is inserted through it,that the flange (1711) is located in the through-opening (1511), wherein a locking element (18) is arranged in the first receiving chamber (13) and is fitted over the locking cylinder (17), wherein a plurality of sawtooth-shaped second locking edges (181) are arranged projecting on the surface of the locking element (18), wherein a third spring (182) is arranged between the locking element (18) and the first separating element (131), wherein in the state in which the first locking edge (161) and the second locking edge (181) are engaged, the locking element (18) can only move downwards relative to each other, wherein by moving the locking element (18) downwards the first locking edge (161) and the second locking edge (181) temporarily disengage, wherein by moving the locking element (18) upwards the engagement structure of the first locking edge (161) and the second locking edge (181) causes a blocking action,wherein a locking head housing (19) is placed on top of the locking part (18) and connected to it, wherein two locking units (191) are rotatably mounted in the locking head housing (19), wherein by moving the locking part (18) downwards the cylinder shaft (171) is pressed in between the two locking units (191) so that the two locking units (191) are pushed apart, wherein a clamping jaw (1911) is arranged at the front end of each locking unit (191) and is designed such that it projects outwards; that the electronic device (20) is provided with a slot (21), wherein by inserting the locking units (191) into the slot (21) the locking units (191) push down the locking part (18) so that the first locking edge (161) and the second locking edges (181) slide relative to each other and engage each other, thereby bringing the locking part (18) into a lower position,thereby increasing the distance between the two locking units (19) so that the two locking units (19) engage in the slot (21), the clamping jaws (1911) now supporting themselves on the inside of the slot (21) so that the lock (10) for electronic devices cannot be pulled out, wherein, by causing the first locking edge (161) and the second locking edge (181) to slide and engage further, the locking part (18) is moved further into a lower position to increase the distance between the two locking units (191); and that the key (30) can be inserted into the keyhole (142) and then rotate the cylinder shaft (171), whereby the flange (151), when the cylinder shaft (171) is rotated 90 degrees, is caused to push the slide (151) to push the locking element (16), thereby disengaging the first locking edge (161) and the second locking edge (181),wherein the locking part (18) rebounds under the influence of the third spring (182), so that the cylindrical shaft (171) located between the two locking units (191) is pulled out, thereby reducing the distance between the two locking units (191) and the two locking units (191) disengage from the slot (21).

The utility model discloses an epaulet convenient to take off and wear quickly. Comprising an epaulet body, and a bottom loop is sewn at one end of the length direction of the back of the epaulet body; a female buckle is installed at the other end of the epaulet body in the length direction of the epaulet, and a male buckle corresponding to the female buckle is installed on the bottom loop. The utility model has the advantages of simple manufacture, easy opening and closing, convenient and fast wearing, time and labor saving, no need of keyhole and the like.

This utility model discloses a smart padlock, relating to the field of padlock technology. It includes a front shell and a rear shell. A silicone button is placed inside a hole in the front shell, and the edge of the silicone button is pressed firmly onto the front shell by a pressure plate. A USB plug and a keyhole plug are installed at the bottom of the front shell. A dome switch is located on the side of the pressure plate away from the silicone button, and the dome switch is attached to the button PCB. The button PCB is fixed to the pressure plate with screws. The main board is located inside the front shell and fixed with screws. A raised plate is provided on one side of the main board, and a semiconductor fingerprint module is soldered to one side of the raised plate. This utility model proposes a large padlock that simultaneously possesses fingerprint and physical button unlocking functions, giving users more usage options and making it more user-friendly. Because the silicone button, USB plug, and keyhole plug are all waterproof, it is suitable for damp and rainy environments, so users don't have to worry about the lock breaking and being unable to open the door in the rain. The internal structure of the lock has anti-knock characteristics, thus greatly improving user security.

The utility model discloses a spring bolt protection type motor vehicle electric door lock, relates to the technical field of electric door locks, solves the problems that an existing device is inconvenient to mount and dismount and poor in using effect, and adopts the following scheme that a limiting plate is fixedly mounted on the inner wall of the left side of a shell. Through the arrangement of the limiting plate, the through hole and the shell cover, the lock cylinder is placed in the outer shell, the limiting block corresponds to the limiting hole, the spring bolt is located in the through hole, then the shell cover is installed on the right side of the outer shell through the installation hole, the shell cover makes contact with the fixing plate in an extrusion mode, and installation and disassembly are easy and convenient; the key is inserted into the key hole and penetrates into the lock hole, the lock tongue is driven to move through rotation of the key, unlocking is completed, a signal can be transmitted to the controller through the NFC sensor, the controller controls the electromagnetic base to electrify the door lock motor, the door lock motor drives the lock tongue to move, and the using effect of the device is improved.

Examples of an apparatus and method are disclosed. In an example, a mounting bracket for attaching to a T-bar of a suspended ceiling is disclosed. The mounting bracket includes a bracket body, the bracket body including, multiple keyholes, and at least one flange hook configured to receive a first edge of a flange of the T-bar, a toolless locking element including a slidable piece having a flange hook configured to receive a second edge of the flange of the T-bar, the second edge of the flange of the T-bar being opposite the first edge of the flange of the T-bar, and a locking mechanism that is configured to allow the slidable piece to move parallel to the bracket body when a force is applied to the locking mechanism.

This invention relates to a method for determining the welding depth during laser welding using an optical coherence tomography (OCT) apparatus, the method comprising the steps of: – pointing a processing laser beam (11) onto a component (10) to create a keyhole (12); – coupling a measuring beam (15) into the beam path of the processing laser beam (11); – performing multiple line scans on the component (10) using the measuring beam (15) in the region of the keyhole (12), and detecting the reflection of the measuring beam (15) from the component (10) using an OCT apparatus. The light emitted is used to generate a superimposed height profile of the component (10) in the region of the keyhole (12); – Based on this height profile, the height of the component surface (10.1), the lateral position of the deepest point (16, 16', 16") of the keyhole (12) on the component (10), and the depth of the deepest point (16) of the keyhole (12) are determined; – Based on the difference between the height of the component surface (10.1) and the depth of the deepest point (16) of the keyhole (12), the keyhole depth (17) is calculated, and the welding depth is determined therefrom.

This utility model relates to the field of lock technology and discloses a lock comprising: a housing with a third keyhole on its side wall; a top and bottom rod assembly, including a top rod and a bottom rod slidably disposed in the housing and a first gear rotatably disposed in the housing, the first gear being located between the top and bottom rods and engaging with them for transmission; and a first lever rotatably disposed in the housing, on which a first lever arm is formed for linkage with the top or bottom rod. When the first lever rotates, the first lever arm drives the top and bottom rods to slide in the third keyhole respectively. This lock can drive the top and bottom rod assembly to slide with a relatively simple structure, reducing the probability of failure.

The utility model discloses a kind of anti-freezing lock cylinder, including the inner lock cylinder and outer lock cylinder being arranged in lock shell lock cylinder hole, inner lock cylinder and outer lock cylinder between being equipped with sand iron, sand iron is sleeved with former inner rotating part and rear inner rotating part;Keyhole of inner lock cylinder and outer lock cylinder is all provided with key guide slot;Former inner rotating part is formed with bayonet hole, and double-insurance bayonet assembly is equipped in bayonet hole;Sand iron is respectively equipped with upper bayonet slot pit and lower bayonet slot pit in the position corresponding to bayonet hole, when double-insurance bayonet assembly is ejected, and is inserted;Outer lock cylinder is formed with stop bead hole in the end of key guide slot, and stop bead hole is equipped with stop bead for preventing needle along key guide slot continue to insert in outer lock cylinder.The utility model is simple in structure, safe and reliable, and has the multiple anti-theft functions of anti-drilling, anti-violence and anti-liquid injection.

A system for assembling continuous overlapping purlins into position upon a plurality of roof beams without having to remove fasteners securing a first installed purlin into position. The system includes a purlin clip with a lower flange and an upper flange. The second purlin overlapping the first purlin, the first and second purlins each comprising first and second longitudinally disposed ends and at least one keyhole disposed within each longitudinally disposed end. The purlin clip is mounted with fasteners to a roof beam proximate the second end of the first purlin and a primary fastener is passed through the at least one keyhole of the first purlin into the secondary fastener, wherein the primary fastener is not fully received into the secondary fastener and remains available for hanging thereon of the keyhole in the first end of the second purlin.

Disclosed is a method for providing control data for manufacturing a three-dimensional object including accessing computer-based model data of at least one portion of the object, at least one data model specifying the scanning of locations of the region to be selectively solidified, using at least one beam along a first trajectory and a second trajectory substantially parallel thereto, the motion vectors of the beams in the construction plane having mutually opposite directional components during the scan along the two trajectories, and the distance between a starting point of the second trajectory and an end point of the previously scanned first trajectory is less than half a beam width of the beam at the end point of the first trajectory; and providing control data of the at least one data model for the generation of a control data set.

The present application relates to lock body technical field, more specifically, it is a kind of mechanical lock body of double drive unlocking mode, including lock body shell, main lock tongue and oblique lock tongue are arranged on the side of lock body shell, motor locking mechanism is arranged in lock body shell, main lock tongue is controlled to be locked when being powered on by motor locking mechanism, oblique lock tongue can be automatically ejected and locked, key unlocking mechanism and handle unlocking mechanism are further arranged in lock body shell, key unlocking mechanism and handle unlocking mechanism can make main lock tongue and oblique lock tongue be recycled and unlocked, key unlocking mechanism has keyhole, keyhole is arranged on the side of lock body shell towards outside, handle unlocking mechanism has handle, handle is arranged on the side of lock body shell towards inside, a kind of mechanical lock body of double drive unlocking mode of the present application has the effect of improving lock body security, realizes double drive unlocking, and solves compatibility problem.

The application provides a cloth cutting control method, device and equipment of a lock eye machine and a storage medium. The method comprises the following steps: determining a cloth cutting entry position and a cloth cutting exit position according to an obtained sewing pattern; starting a sewing process; and controlling the cloth cutting tool to move downward along a vertical direction when a needle moves to a preset position, wherein the cloth moves along a horizontal direction during the sewing process, and the cloth cutting tool contacts the cloth when the cloth cutting tool is at the cloth cutting entry position in the horizontal direction. The cloth cutting tool is controlled to move up and down along the vertical direction when the cloth cutting tool moves downward along the vertical direction to a lowest position point, and the cloth cutting tool moves up and down along the vertical direction until the cloth cutting tool is at the cloth cutting exit position in the horizontal direction, wherein the height of the lowest position point is greater than or equal to the thickness of the cloth. The method simplifies the calculation process of the cloth cutting tool during cloth cutting, solves the problems of spindle speed reduction, stitch deformation and the like caused by the downward pressing type cloth cutting, improves the sewing and cloth cutting efficiency, and ensures the appearance of the finished product.

This application discloses an emergency stop button safety lock, relating to the field of lock technology. It integrates and positions an information panel, a protective housing, and lock components together, using the lock components to lock the protective housing. A piece of paper on the information panel, which obscures the keyhole and displays locking information, ensures locking security. The paper can only be replaced or moved when the protective housing is open, and a key must be used to penetrate the paper to open the lock components. The paper is replaced or moved in advance when locking the protective housing, and the locking information is displayed. This emergency stop button safety lock achieves the following technical advantages: convenient use, clear recording of opening counts without the need for batteries and communication modules, good stability, indestructible non-destructive removal, high security, and easy determination of whether it has been maliciously opened.

The utility model discloses a lock head protection structure and a snakelike chain lock thereof. The lock head protection structure comprises a lock head with a key hole. The protective shell is arranged outside the lock head in a sleeving manner and is provided with a key extending hole; the self-opening and self-closing plugging piece is movably mounted in the protective shell and is used for plugging the key extending hole; the guide cavity is positioned in the protective shell and between the key extending hole and the key hole of the lock head; the supporting plate is fixedly arranged in the guiding cavity and provided with a guiding hole coaxial with a key hole outside the key stretching-in hole, in daily use, by the adoption of the technical scheme, the obtained S-shaped chain lock has the aesthetic feeling of an industrial product as a whole, then the sales volume of the product can be increased, meanwhile, a sealing protection structure is formed by the protection shell and the self-opening-closing plugging piece, and the service life of the S-shaped chain lock is prolonged. According to the self-opening and self-closing lock, the situation that a surface coating or spray paint falls off due to scratching or impacting of the lock head can be avoided, the service life of the lock head is prolonged, when the lock head needs to be opened, a key matched with the lock head jacks the self-opening and self-closing plugging piece, penetrates through the guide hole and then is inserted into the lock head, and then unlocking action can be conducted.

The utility model relates to the field of handles, and discloses a handle with a key hole opening and closing plate, which comprises a handle body, a key hole arranged on the handle body and the opening and closing plate arranged on the handle body and used for opening and closing the key hole. A first limiting part for limiting the position of the opening and closing plate when the opening and closing plate closes the key hole is arranged between the opening and closing plate and the handle body; the first limiting component comprises a penetrating hole formed in the opening and closing plate, a limiting hole formed in the position, opposite to the penetrating hole, of the handle body and a limiting plug pin which penetrates through the penetrating hole and is inserted into the limiting hole to limit overturning of the opening and closing plate. Therefore, the key hole can be opened more conveniently in a labor-saving mode.

A versatile dual-application hook and storage system is disclosed. A mounting shaft with a central pass-through bore enables tool-free engagement with pegboards or slotted panels via a keyhole opening and also permits direct or through-panel wall mounting with a fastener. Lateral pin-lock features provide rotational stability. The system supports interchangeable accessories including but not limited to hooks, straps, baskets, and other storage or non-storage elements across multiple surface types in a compact, space-efficient design.

The pin tumbler lock cylinder comprises a lock shell and a rotating core, the lock shell is provided with a rotating hole, a machining hole and a first pin tumbler hole, the machining hole and the first pin tumbler hole are communicated with the rotating hole, the machining hole and the first pin tumbler hole are formed in the two sides of the rotating hole respectively and located on the same straight line, and the first pin tumbler hole is provided with an elastic piece and a first pin tumbler. The elastic piece is located between the hole bottom of the first spring hole and the first spring, the rotating core rotatably penetrates through the rotating hole and is provided with a key hole allowing a key to penetrate through and a second spring hole communicated with the key hole, the second spring hole is provided with a second spring, and the second spring partially extends out of the key hole. The included angle between the axis of the machining hole and the axis of the second pin tumbler is an acute angle, so that the machining hole and the second pin tumbler are staggered, the elastic piece drives the first pin tumbler to partially stretch out of the first pin tumbler, and the part, stretching out of the first pin tumbler, of the first pin tumbler stretches into the second pin tumbler and abuts against the second pin tumbler to limit rotation of the rotary core relative to the lock shell.

To provide a cylinder lock, building equipment, and key with a key change mechanism that can be miniaturized. [Solution] A cylinder lock comprising an inner cylinder having a keyhole, an outer cylinder rotatably fitted to the inner cylinder, and a key change mechanism provided across the inner and outer cylinders, wherein the key change mechanism comprises an upper pinhole provided in the outer cylinder, an upper pin housed in the upper pinhole so as to be radially movable, a biasing member that biases the upper pin radially inward, a lower pinhole provided in the inner cylinder, a lower pin housed in the lower pinhole so as to be radially movable and having its tip positioned to protrude into the keyhole, a regulating member that restricts the movement of the upper pin toward the lower pin, a first inner cylinder side housing groove provided on the outer circumferential surface of the inner cylinder so as to straddle the lower pinhole and house the regulating member, a second inner cylinder side housing groove provided on the outer circumferential surface of the inner cylinder for housed a specified member during key change operation, and an outer cylinder side housing groove provided on the inner circumferential surface of the outer cylinder so as to straddle the upper pinhole and house the regulating member.

The utility model discloses a building security access control device, and relates to the technical field of access control equipment. Comprising a fixed back plate and an access control interphone, a clamping groove is formed in the fixed back plate, a lock hole is formed in the side wall of the clamping groove, the access control interphone is inserted into the clamping groove, an assembling bin is arranged in the access control interphone, a spring bolt assembly is installed in the assembling bin, and the head end of the spring bolt assembly extends outwards from the assembling bin and is clamped into the lock hole. The access control interphone comprises a shell and a control mainboard. According to the building security access control device, the fixed back plate is pre-installed on the wall surface, the access control interphone is inserted into the clamping groove of the fixed back plate, and the head end of the spring bolt assembly is clamped into the lock hole, so that the access control interphone is connected with the fixed back plate in a locked mode, and when disassembly and maintenance are needed, only a special wrench needs to be inserted into a plum blossom socket, a shifting wheel is rotated, and the access control interphone can be disassembled and maintained. The door control interphone slides out of the clamping groove, time and labor are saved, and later maintenance and replacement of the building door control are facilitated.