55results about How to "Latch implementation" patented technology

The invention relates to a flexible DC power transmission converter valve control protection system and a valve control blocking method, and belongs to the technical field of flexible DC power transmission of an electric power system. A pole control interface unit arranged at the uppermost layer of a valve control system is enabled to be connected with submodule interface units arranged at the lowest layer of the valve control system via an independent communication channel. When a fault occurs in the valve control system, an emergency blocking signal is transmitted to submodules by a pole control system directly via the independent communication channel between the pole control interface unit and the submodule interface units so that blocking of a converter valve is realized. The pole control system and the submodules in the converter valve are connected via the independent communication channel. When the fault occurs in the valve control system and the converter valve requires to be blocked, the emergency blocking command is directly transmitted to the submodules by the pole control system via the communication channel so that blocking of the submodules is realized. The submodules of the converter valve can still be protected from being damaged when the fault occurs in the valve control system, and the system is simple and easy to realize.

The invention discloses a pipeline burying device for water conservancy projects, and relates to the technical field of water conservancy projects. The problems are solved that synchronous reverse quick adjustment of two clamp structures cannot be achieved, and two clamps cannot be locked again in a thread transmission adjustment process; and a plurality of ground nails cannot be synchronously fixed during fixing, and mutual combination of the angular rotation of a boom main body and the disassembly of a fixed structure can not be achieved through the structural improvement. The pipeline burying device for the water conservancy projects comprises a base, wherein a fixing structure is inserted and fixed on the base, a boom main body is rotatably connected to the base, and a hydraulic telescopic rod is fixedly connected to the boom main body through bolts. The outer wall of the boom main body is welded with a toggle lever, when the toggle lever rotates along with the boom main body, thetoggle lever is in contact with a force receiving block, and at this time, the force receiving block, a mounting seat, a connecting seat and ground nails are all in a rising state, thereby realizing the extraction of the ground nails from the soil.

The invention discloses a manual interlocking device of a three-station mechanism. The manual interlocking device comprises a side board arranged on the mechanism, a DS baffle and an ES baffle, wherein the DS baffle and the ES baffle are arranged on the side board. A mechanical interlocking device supporting board, a pair of driving pins which are vertically connected in a sliding mode along the side board, and a pair of cams which are arranged along the inner sides of the driving pins in parallel are arranged at the front end of the side board. Interlocking pins which slide relatively are arranged on the supporting board, and the interlocking pins correspond to locking holes in the DS baffle and the ES baffle. The inner side, corresponding to the interlocking pins, of the supporting board is connected to a hinge pin and provided with a pair of driving levers, and one ends of the driving levers are matched with the driving pins. The driving pins link the driving levers to rotate through manual or electric operation, the interlocking pins act to be inserted into the locking holes in the DS baffle or the ES baffle to lock the DS baffle or the ES baffle through the driving levers. The manual interlocking device of the three-station mechanism can be automatically locked when manual operation reaches an expected position, and the interlocking function of manual operation of the three-station operating mechanism used in cooperation with a high-voltage isolation / grounding three-station switch is achieved.

The invention discloses a parking space lock, and aims to provide a triangular parking space lock which has a reasonable structure, is convenient to use and has a long service life; the parking space lock comprises a hollow tube, a key, a lock core, a bolt, a pull rod, a hook, a torsion spring, a lock bar, a hook seat, a base, a lower core shaft, a U-shaped cover and an upper core shaft; the base is fixedly arranged on the ground; the hollow tube is connected with the upper end of the U-shaped cover through the upper core shaft; the lower end of the U-shaped cover is connected with the left side of the base through the lower core shaft; the upper end of the hollow tube is provided with a hole for installing the lock core, and the lower end of the hollow tube is provided with a hole for installing a hook shaft and an open slot for the lock bar to enter; the lock core is fixedly arranged on the upper side in the hollow tube; the tail of the lock core is connected with the bolt; the upper end of the pull rod is connected with the bolt, and the lower end of the pull rod is connected with the hook; the hook is fixedly arranged on the hook seat; the hook seat is provided with a hole for the hook shaft to pass through; the hook shaft is provided with a groove; the hook seat is arranged on the hook shaft through a flat-head screw; and the right side of the base is provided with the lock bar. Because the lock core is arranged on the upper end of a triangle or in the U-shaped cover, the parking space lock is not easy to damage.

The invention provides a dual unipolar voltage module chain and a hybrid multilevel converter, and belongs to the fields of a power electronic technology and power transmission and distribution. The dual unipolar voltage module chain consists of N unipolar voltage modules which are connected in series in sequence, wherein the N unipolar voltage modules comprise N1 positive electrode unipolar voltage modules and N2 negative electrode unipolar voltage modules; when a bidirectional current passes through, bipolar voltage output capability is formed; the hybrid multilevel converter based on the module chain at least comprises two same phases, wherein each phase comprises a dual unipolar voltage module chain, a three-level bridge arm and an electric reactor, wherein one port of the dual unipolar voltage module chain is connected with the midpoint of the three-level bridge arm while the other port of the dual unipolar voltage module chain is connected with one end of the electric reactor; and the other end of the electric reactor is connected with an alternating current voltage. By adoption of the dual unipolar voltage module chain and the hybrid multilevel converter, wide-range alternating current-direct current conversion can be realized at a relatively low engineering cost and in a compact occupied space; and meanwhile, high conversion efficiency, good harmonic characteristic and direct current fault ride-through capability are achieved.

The invention relates to a rail vehicle having a sanitary system which has a waste water tank (1) and a fresh water tank (2) which are each equipped with associated filling level sensors (3), wherein a control device (4) is provided for establishing a link in terms of control between the filling levels in the fresh water tank (2) and waste water tank (1), which control device monitors the filling level in the waste water tank (1) by means of the associated sensors (3) and controls the filling level in the fresh water tank (2) as a function of a measured filling level in the waste water tank (1).

The invention relates to a lock system applied to a shared article and an unlocking and locking method thereof, belongs to the technical field of a shared article lock system, and solves the problem that in a conventional shared bicycle unlocking process, the user experience is poor since the user operation is complicated, a mobile phone is not carried or the mobile phone is out of battery, and the traffic of the mobile phone runs out. The lock system comprises a lock device and a server, the lock device generates an encryption lock code according to a user input information recognition resultand a code lock identification code stored in the lock device and transmits the encryption lock code to the server, the server decrypts the encryption lock code and obtains the user input informationrecognition result and the code lock identification code stored in the lock device, user personal information stored in the server is searched, whether the user state is normal is determined, storedcode lock state information is extracted, an unlocking instruction is transmitted to the lock device and charging is started when the user state is normal and the code lock is in a locking state, andthe lock device receives the unlocking instruction and performs an unlocking motion. The unlocking experience of users is effectively enhanced.

The invention discloses an adaptive adjusting device for transmitting power of an induction log tool. Configuration software or flash programming is not needed, and automatic adjustment is completelyrealized by a hardware circuit. According to the hardware circuit in the invention, the transmitting power is automatically calculated and adjusted according to a signal acquired by an AD (Analog / Digital) converter, the final signal received by the induction log tool is ensured to be always positioned in an optimum state, the received signal is not too large so as not to be saturated, the signal is not too small so as not to cause insufficient measurement accuracy, and finally the effects of reducing partial power consumption of the system, reducing the manual step-up error and improving the measurement accuracy and measurement efficiency are achieved. Meanwhile, since the design of a full hardware circuit is adopted, program software participation is not needed, and the reliability of thesystem is greatly improved. Furthermore, a hardware module can be separately designed to be arranged in an instrument system, and the device is flexible to debug and convenient to detach.

The invention discloses a mining intrinsically safe closed-end amplified phone circuit device, which comprises an 18V intrinsically safe power module, a charging control circuit, a voice amplifier, a dotting output module, a front-end voice amplification module and a signal switching processing module, wherein the 18V intrinsically safe power module is connected with the charging control circuit through a connecting terminal; the charging control circuit is connected with the voice amplifier, the dotting output module, the front-end voice amplification module and the signal switching processing module respectively; the voice signal output end of the signal switching processing module is connected with the voice amplifier which is connected with a loudspeaker; and the signal switching processing module is connected with a dotting device through a dotting button and a transmitter button. The device can be used for voice communication, can stop and lock equipment such as a motor when used together with various electrical control devices to ensure the safety of personnel and the equipment, and also can control external equipment.

The invention discloses a stretching cushion locking device which comprises a stretching cushion cylinder, a draw bar, a locking sleeve, mounting plates, driving components, supports, movable plates, locking columns and springs. The stretching cushion locking device has the advantages that the movable plates can be driven by the driving components to move towards the centers of stretching cushions, and accordingly the locking columns can be driven by the movable plates to move towards the centers of the stretching cushions; at least a part of each locking column can extend into locking teeth on the corresponding locking sleeve at the moment and can mesh with the locking teeth, accordingly, the stretching cushion locking device has functions of preventing the draw bar from downwardly moving owing to the mode, the stretching cushions can be locked, the locking columns can be driven to outwardly move when the driving components move away from the centers of the stretching cushions, and the draw bar can freely move up and down; the stretching cushions can be locked at optional locations in controllable stroke ranges by the aid of simple and reliable mechanical transmission and locking structures of the stretching cushion locking device, accordingly, equipment and mechanisms can be simplified to a great extent, and spaces can be saved.

The invention discloses an adaptive adjusting method for transmitting power of an induction log tool. Configuration software or flash programming is not needed, and automatic adjustment is completelyrealized by a hardware circuit. According to the adaptive adjusting method disclosed by the invention, the transmitting power is automatically calculated and adjusted according to a signal acquired byan AD (Analog / Digital) converter, the final signal received by the induction log tool is ensured to be always positioned in an optimum state, the received signal is not too large so as not to be saturated, the signal is not too small so as not to cause insufficient measurement accuracy, and finally the effects of reducing partial power consumption of the system, reducing the manual step-up errorand improving the measurement accuracy and measurement efficiency are achieved. Meanwhile, since the design of a full hardware circuit is adopted for adjustment, program software participation is notneeded, and the reliability of the system is greatly improved.

The invention discloses a safety protection system for a transformer substation. The safety protection system comprises a temperature sensor, an oxygen content sensor, an SF6 sensor, a smoke sensor, acontrol unit, a fan and a safety protection door lock; the safety protection door lock comprises an alarm indicating lamp, an intermediate relay ZJ, a locking electromagnet DSN, a bipolar power switch Q1, a door lock body, a fixed door handle, a key hole, a movable door handle, a movable door handle unlocking auxiliary contact JS and a movable door handle rotating disc; when a locking electromagnet DSN coil is powered off, the locking electromagnet DSN is released and locked to lock the door; and the circle center of the movable door handle rotating disc is fixedly connected with a rotating shaft of the movable door handle, the movable door handle rotating disc rotates along with the movable door handle, a movable door handle unlocking auxiliary contact JS is arranged at a missing part ofthe movable door handle rotating disc, and the movable door handle rotary table rotates along with the movable door handle to trigger the movable door handle unlocking auxiliary contact JS. Accordingto the safety protection system, locking and alarming functions of all room doors are realized, and outdoor workers are effectively prevented from entering rooms by mistake.

The invention relates to the technical field of door locks, and particularly relates to an intelligent double-control gourd shaped lock. The lock is characterized in that a handle is provided with a first mounting hole, wherein a lock core body is arranged in the first mounting hole, and one end of the lock core body can be used for inserting into a key and rotating along the axial direction through the key; a first transmission piece is arranged on the first mounting hole, wherein one end of the first transmission piece is connected with a first connecting structure through the lock core body; the first transmission piece is connected with the handle through a second connecting structure, wherein the first transmission piece synchronously rotates along the axial direction under the driving of the handle; a lock shell is coaxial with the first mounting hole and is provided with a second mounting hole, a second transmission piece is arranged on the second mounting hole and connected with a power device, and the second transmission piece can move along with the axial direction of the second mounting hole under the driving of the power device; an electric control device is connected with the power device, and can control the power device through receiving electric signals to drive second transmission piece to approach or keep away from the first transmission piece; a cam is connected with the second transmission piece, and can rotate under the driving of the second transmission piece. The invention has the advantages of simple and convenient unlocking and good reliability.

The invention relates to a pressure vessel valve which is simple in structure, better in security and reliability, capable of avoiding being opened by mistake, and suitable for automatic locking. The pressure vessel valve comprises a valve body, a valve rod, a locking rod and a hand wheel. The valve rod comprises a conical section and a cylindrical section. The valve body comprises a first cylindrical cavity, a conical cavity and a second cylindrical cavity. The diameter of the upper port of the conical cavity is smaller than that of the second cylindrical cavity. An annular platform is formed on the bottom portion of the second cylindrical cavity, and a locking groove is formed in the annular platform. A tube body of the lower middle section of the locking rod is arranged on the cylindrical section of the valve rod in a sleeved mode, and a pair of waist-shaped holes is formed in the upper middle portion of the tube body in the radial direction. A spring pin is arranged inside the pin hole of the locking rod and two ends of the spring pin stretch out the pair of waist-shaped holes. An annular boss is arranged on the bottom of the locking rod. An annular locking pin which is arranged on the tube body in a sleeved mode is arranged at the upper end of the annular boss. A pressing ring is arranged at the lower end of the spring pin. A spring is arranged between the pressing ring and the annular locking pin. A protrusion which is suitable for being matched with the locking groove is arranged on the lower end surface of the annular locking pin.

The invention provides hoisting equipment for a green building assembly type prefabricated wallboard, and relates to the technical field of hoisting devices, the hoisting equipment comprises a seat body, a connecting part, an auxiliary part and a hanging part; a connecting seat A is mounted on the seat body; two rotating seats A are welded to the bottom of the connecting seat A, and each rotating seat A is rotationally connected with a rolling wheel. Each sliding block is slidably connected with two sliding rods B, the tail ends of the two sliding rods B on the left side and the tail ends of the two sliding rods B on the right side are each in threaded connection with a connecting block, and the bottom end faces of the two connecting blocks are each provided with a hook in a welded mode. Each sliding rod B is sleeved with an elastic piece B, and the elastic pieces B form a buffering structure of the hook, so that stress fracture of the hook during hanging can be prevented, and the problems that firstly, automatic locking of the hook cannot be achieved, and safety is low are solved; and secondly, automatic adjustment of the steel wire rope cannot be achieved during hoisting, and automatic locking of the steel wire rope after adjustment is achieved.

The invention relates to a locking device (1) for a motor vehicle comprising actuating means (23), a lock (1) with a locking mechanism, comprising a rotary latch and at least one pawl, the actuating means (23) and the lock can be interconnected by means of a Bowden cable and the Bowden cable comprises means for actively blocking (8) a force transmitted by the Bowden cable (7, 7').

The invention relates to a pressure vessel valve which is simple in structure, better in security and reliability, capable of avoiding being opened by mistake, and suitable for automatic locking. The pressure vessel valve comprises a valve body, a valve rod, a locking rod and a hand wheel. The valve rod comprises a conical section and a cylindrical section. The valve body comprises a first cylindrical cavity, a conical cavity and a second cylindrical cavity. The diameter of the upper port of the conical cavity is smaller than that of the second cylindrical cavity. An annular platform is formed on the bottom portion of the second cylindrical cavity, and a locking groove is formed in the annular platform. A tube body of the middle and lower section of the locking rod is arranged on the cylindrical section of the valve rod in a sleeved mode, and a pair of waist-shaped holes is formed in the middle and upper portion of the tube body in the radial. A spring pin is arranged in the pin hole of the locking rod and two ends of the spring pin stretch out of the pair of waist-shaped holes. An annular boss is arranged on the bottom of the locking rod. An annular locking pin which is arranged on the tube body in a sleeved mode is arranged at the upper end of the annular boss. A pressing ring is arranged at the lower end of a spring pin. A spring is arranged between the pressing ring and the annular locking pin. A protrusion which is suitable for being matched with the locking groove is arranged on the lower end surface of the annular locking pin.

The application provides a shift register, a gate drive circuit and a display control method. The shift register includes: a first input module, a latch module, and a first output control module; the control terminal, the first terminal, and the second terminal of the first input module are respectively connected to the first gate voltage signal terminal and the first latch The signal end and the pull-up node are electrically connected; the first control end, the second control end, the first end, and the second end of the latch module are respectively connected to the pull-up node, the pull-down node, the first adjustment signal end, and the second adjustment The signal terminal is electrically connected; the control terminal, the first terminal, and the second terminal of the first output control module are respectively electrically connected to the pull-up node, the clock signal terminal, and the output terminal; the technical solution of the application is easier to realize the pull-up node in the display stage The potential is stable, so as to ensure the stability of the grid voltage signal output by the first output control module, and reduce the phenomenon of poor LHB stripes and poor split screens.

The invention relates to a pressure vessel valve which has a simple structure, better safety and reliability, can avoid falsely opening and is suitable for automatic blocking. The pressure vessel valve comprises a valve body, a valve rod, a lock rod and a hand wheel, wherein the valve rod comprises a conical segment a cylindrical segment; the valve body comprises a first cylindrical cavity, a conical cavity and a second cylindrical cavity; the diameter of the upper port of the conical cavity is smaller than the diameter of the second cylindrical cavity, and a circular platform is formed at the bottom of the second cylindrical cavity; a blocking slot is arranged in the circular platform; the pipe body of the middle lower segment of the lock rod is sheathed on the cylindrical segment of the valve rod, and a pair of slotted holes are formed in the radial direction of the middle upper part of the pipe body; a spring pin is arranged in a pin hole of the lock rod, and two ends of the spring pin extend out of the slotted holes; a circular boss is arranged at the bottom of the lock rod, and a circular lock pin sheathed on the pipe body is arranged at the upper end of the circular boss; a pressing ring is arranged at the lower end of the spring pin, and a spring is arranged between the pressing ring and the circular lock pin; and a bulge suitable for being matched with the blocking slot is arranged on the lower end surface of the circular lock pin.

The invention relates to a pressure vessel valve which is simple in structure, better in security and reliability, capable of avoiding being opened by mistake, and suitable for automatic locking. The pressure vessel valve comprises a valve body, a valve rod, a locking rod and a hand wheel. The valve rod comprises a conical section and a cylindrical section. The valve body comprises a first cylindrical cavity, a conical cavity and a second cylindrical cavity. The diameter of the upper port of the conical cavity is smaller than that of the second cylindrical cavity. An annular platform is formed on the bottom portion of the second cylindrical cavity, and a locking groove is formed in the annular platform. A tube body of the middle and lower section of the locking rod is arranged on the cylindrical section of the valve rod in a sleeved mode, and a pair of waist-shaped holes is formed in the middle and upper portion of the tube body in the radial. A spring pin is arranged in the pin hole of the locking rod and two ends of the spring pin stretch out of the pair of waist-shaped holes. An annular boss is arranged on the bottom of the locking rod. An annular locking pin which is arranged on the tube body in a sleeved mode is arranged at the upper end of the annular boss. A pressing ring is arranged at the lower end of a spring pin. A spring is arranged between the pressing ring and the annular locking pin. A protrusion which is suitable for being matched with the locking groove is arranged on the lower end surface of the annular locking pin.

The present application discloses a control method for the suction lock of the back door of the automobile, the control method includes the steps: S11, obtaining the full lock signal, the half lock signal, the state of the ratchet and the pull cord related to the ratchet information; wherein, the full lock signal is whether the ratchet is detached from pressing the full lock microswitch during the rotation of the ratchet, and the half lock signal is whether the ratchet is detached from the half lock microswitch during the rotation of the ratchet; the pawl The state information of the ratchet refers to whether the pawl is in a locked state or an open state, and the state information of the pull rope refers to whether the pull rope is in a relaxed state or a tensioned state; S12. According to the full lock signal, the half lock signal, the The status information of the ratchet and the pull cord controls the operation of the locking drive motor to realize the locking of the suction lock. The control method of the present application can avoid the problem that the electric back door suction lock with snow load function cannot be automatically closed to the full lock position at low temperature.

The invention relates to a control and protection system of a flexible direct current transmission converter valve and a valve control locking method, belonging to the technical field of flexible direct current transmission of electric power systems. The present invention connects the uppermost pole control interface unit of the valve control system with the lowermost submodule interface unit of the valve control system through an independent communication channel. The independent communication channel between the module interface units sends the emergency blocking signal to the sub-modules to realize the blocking of the converter valve. The present invention connects the extreme control system with the sub-modules in the converter valve through an independent communication channel. When the valve control system fails and the converter valve needs to be locked, the extreme control system directly sends the emergency locking command to the The sub-module realizes the locking of the sub-module. The present invention can still protect the converter valve sub-module from being damaged and replaced when the valve control system fails, and is simple and easy to realize.

The invention relates to a pressure vessel valve capable of avoiding error opening and suitable for automatic blocking, which has the advantages of simple structure and better safety and reliability. The pressure vessel valve comprises a valve body, a valve rod, a locking rod and a hand wheel, wherein the valve rod comprises a conical section and a cylindrical section; the valve body comprises a first cylindrical cavity, a conical cavity and a second cylindrical cavity; the diameter of an upper port of the conical cavity is smaller than that of the second cylindrical cavity to form an annular platform at the bottom of the second cylindrical cavity; a locking groove is formed in the annular platform; a tube body at the middle lower section of the locking rod is arranged on the cylindrical section of the valve rod in a sleeving manner; a pair of waist-shaped holes is radially formed at the middle upper part of the tube body; a spring pin is arranged in a pin hole of the locking rod, and the two ends of the spring pin extend out of the waist-shaped holes; an annular boss is arranged at the bottom of the locking rod, an annular locking pin arranged on the tube body in a sleeving manner is arranged at the upper end of the annular boss, a pressure ring is arranged at the lower end of the spring pin, and a spring is arranged between the pressure ring and the annular locking pin; and a bulge matched with the locking groove is arranged on the lower end surface of the annular lock pin.

The invention relates to a pressure vessel valve suitable for automatic locking which is simple in structure, good in safety and reliability and can avoid false opening, which comprises: a valve body, a valve stem, a locking rod and a hand wheel; Shaped section and columnar section; The valve body includes: a first cylindrical chamber, a tapered chamber and a second cylindrical chamber; the diameter of the upper port of the tapered chamber is smaller than the diameter of the second cylindrical chamber, so that The bottom forms an annular platform, and a locking groove is arranged on the annular platform; the pipe body of the middle and lower sections of the locking rod is sleeved on the cylindrical section of the valve stem, and a pair of waist-shaped holes are arranged radially at the middle and upper part of the pipe body; the lock There is a spring pin in the pin hole of the rod, and the two ends of the spring pin extend out of the pair of waist-shaped holes; the bottom of the lock rod is provided with an annular boss, and the upper end of the annular boss is provided with an annular lock pin sleeved on the pipe body A pressure ring is arranged at the lower end of the spring pin, and a spring is arranged between the pressure ring and the annular lock pin; a protrusion suitable for matching with the locking groove is provided on the lower end surface of the ring lock pin.

The invention provides a landscape maintenance intelligent monitoring and management device based on the Internet of Things, and relates to the technical field of monitoring devices, and the device comprises a fixed seat and a mounting part. The fixing base is fixed to a telegraph pole through two fixing bolts, and a control box is installed on the fixing base. And two protection rods are symmetrically welded on the fixed seat. Due to the fact that the clamping blocks are aligned with the fixing bolts in position, when the two clamping blocks move inwards by 10 cm, the inner sides of the clamping blocks make contact with the fixing bolts; when the fixing bolt is used for fixing, the adjusting rod can be rotated to enable the clamping block to move inwards after fixing is completed, then locking of the fixing bolt can be achieved through the clamping block, and the problems that in the fixing process, fixing is usually conducted through the bolt, fixing cannot be achieved through other structures, and the fixing effect is poor are solved. And a plurality of fixing structures cannot be matched with each other.

The invention relates to a pressure vessel valve which is simple in structure and fine in safety and reliability, can avoid opening by mistake, and is suitable for automatic locking. The pressure vessel valve comprises a valve body, a valve rod, a lock rod and a hand wheel. The valve rod comprises a conical section and a cylindrical section. The valve body comprises a first cylindrical cavity, a conical cavity and a second cylindrical cavity. The diameter of an upper port of the conical cavity is smaller than that of the second cylindrical cavity so as to form an annular platform at the bottom of the second cylindrical cavity, and a lockout groove is arranged on the annular platform. A middle lower section of a tube body of the lock rod is sleeved on a cylindrical section of the valve rod, and a pair of waist-shaped holes is radially arranged on a middle upper section of the tube body. A spring pin is arranged in a pin hole of the lock rod, and the pair of waist-shaped holes extends from two ends of the spring pin. An annular boss is arranged at the bottom of the lock rod, an annular lock pin sleeved on the tube body is arranged at the upper end of the annular boss, a pressure ring is arranged at the lower end of the spring pin, and a spring is arranged between the pressure ring and the annular lock pin. A protrusion suitable for being matched with the lockout groove is arranged on a lower end face of the annular lock pin.