80results about How to "To achieve the effect of locking" patented technology

The invention discloses a looseness-preventing and disassembling-preventing bolt. The looseness-preventing and disassembling-preventing bolt comprises a screw, a gasket and a nut, wherein the gasket and the nut are arranged on the screw in a sleeving manner. Grooves extending in the axis direction of the screw are formed in the screw and matched with bosses arranged on the gasket, so that the gasket can only move in the axis direction of the screw and can not rotate around the axis of the screw. The gasket can be in contact with the nut, helical teeth are arranged on the contact faces of the gasket and the nut respectively, and the helical teeth on the gasket are meshed with the helical teeth on the nut, so that when the nut is screwed to the portion where the nut is meshed with the gasket, the nut is locked, looseness caused by vibration and the like can be avoided, and disassembling is also difficult.

The invention discloses a machining fixture locking device. The machining fixture locking device comprises a base plate; two extension cylinders are symmetrically and fixedly mounted on the base plate; piston rods are arranged on the two extension cylinders, and are fixedly connected with tooth plates; buffer cavities are formed in the piston rods; piston blocks are slidingly connected into the buffer cavities; moving rods are fixedly connected to one sides of the piston blocks; the ends, far from the piston blocks, of the moving rods are fixedly connected with clamping plates; the other sidesof the piston blocks are fixedly connected with second springs; and the ends, far from the piston blocks, of the second springs are fixedly connected to the side walls of the buffer cavities. Tooth blocks adaptively slide up, and meanwhile, drive first springs to compress; and under the elastic effect of the first springs, the tooth blocks are engaged with the tooth plates again, and meanwhile, end surfaces B abut against the tooth plates to prevent retreating of the tooth plates, so that the locking effect on the piston rods is achieved, and the influence on the clamping effect of the pistonrods by instable air pressure of the extension cylinders is prevented.

The invention relates to silk-screen printing equipment of a small-size capacitor and a manufacturing method of the small-size capacitor. A silk-screen pattern of a printing silk screen of the silk-screen printing equipment of the small-size capacitor comprises a target product zone and an auxiliary zone arranged on the periphery of the target product zone. The target product zone comprises a plurality of inner electrode pattern units which are used for forming an inner electrode of a target product in a slurry-through mode. The auxiliary zone comprises a plurality of auxiliary pattern units which are arrayed at intervals in the horizontal direction and the longitudinal direction in sequence. A gap is formed between two adjacent auxiliary pattern units in the horizontal direction. The gap is formed between two adjacent auxiliary pattern units in the longitudinal direction. After printing, the auxiliary pattern units form auxiliary pattern layers, after overlapping, the auxiliary pattern layers are embedded into the gaps, a plurality of membrane overlapped layers can be embedded in a multi-layer-continuous mode, deviation and displacement caused by moving again after overlapping of membranes can be avoided, a locking effect is achieved, and the uniformity and the stability of the membranes and blocks in following processes are guaranteed.

The invention discloses a lock-attachment rotary platform, which comprises a work platform and a base. The center of the lower surface of the work platform is fixedly connected with an upper ring groove block, the center of the upper surface of the base is fixedly connected with a lower ring groove block corresponding to the upper ring groove, and a ball capable of enabling the work platform to rotate relative to the base is positioned between the upper ring groove block and the lower ring groove block. The lock-attachment rotary platform uses a rotation principle to rotate a jig platform to achieve the lock attachment effect after being turned. The upper ring groove block and the lower ring groove block can rotate at 360 degrees freely by combining the central bearing principle. Forceful magnets are arranged on the four edges of the base, so that every time the lock-attachment rotary platform rotates at 90 degrees, absorption and location can be performed later. Simultaneously, deformation of the work platform caused by the large size of the work platform is prevented. L-shaped support blocks are additionally positioned at four corners of the lock-attachment rotary platform, so that the lock-attachment rotary platform can be used for assembling, locking and attaching large electronic products and the like. Therefore, inconvenience caused by manual turning operation of operators is overcome, work efficiency is improved, and the lock-attachment rotary platform is simple in structure and convenient to use.

The invention discloses a battery pack quick-change device for a vehicle and the vehicle, and relates to the technical field of vehicles. The battery pack quick-change device for the vehicle comprises: a limiting pin shaft, wherein one end of the limiting pin shaft is connected with a lower vehicle body of the vehicle; a shell, wherein the shell is connected with the battery pack and is internallyprovided with a cavity with a trapezoidal structure; a bolt, wherein the bolt is positioned at the lower part of the cavity, extends into the cavity and is in threaded connection with the shell; a supporting rod, wherein the supporting rod is positioned in the cavity, is supported in the cavity by a bolt and can move up and down relative to the shell along with the bolt; and a limiting ball, wherein the limiting ball is located in the middle of the supporting rod, a concave part is arranged in the middle of the limiting pin shaft, the interior of the supporting rod is hollow, a notch is formed in the position, corresponding to the concave part, of the supporting rod, the limiting ball is matched with the notch, and when the battery pack quick-changing device is in a locked state, the limiting pin shaft is inserted into the supporting rod, and the limiting ball is clamped into the concave part. The invention further provides a vehicle which comprises the battery pack quick-changing device. The mounting and dismounting efficiency of the battery pack can be improved.

The present invention provides a rotating platform with a brake locking mechanism. The rotating platform comprises a rotating shaft and a brake locking mechanism in a body. The brake locking mechanism comprises an air cylinder, a piston rod, a driven member and a plurality of rolling members, wherein a high-pressure air source enters into a chamber of the air cylinder via the body, the piston rod is driven to drive the driven member to perform straight reciprocating motion, the rolling members are driven to slide aside because of the oblique cone shape of the driven member which is wider in the bottom than the top, and a plurality of claw portions on the top end of the air cylinder are made to expand externally to press against inner walls of the shaft holes in the center of the rotating shaft, thereby enabling the rotating shaft to have the brake locking effect. According to the rotating platform with a brake locking mechanism, only the high-pressure air source is used as a driving source, an adequate brake torque can still be obtained after the amplification of the air pressure thrust through the oblique faces, and the effects of brake locking by the rotating shaft can thus be obtained. Moreover, high-pressure air is used as the driving source and oil pressure equipment with complicated parts is not need to be configured, so the equipment is low in costs and has the advantages of miniaturization.

The invention relates to an assembly type precast concrete member die. The assembly type precast concrete member die comprises a die mechanism and a bearing mechanism. According to the assembly type precast concrete member die, the die adopts an assembly structure, so that when a prefabricated member is molded and demoulded, the effect of rapidly disassembling and assembling the prefabricated member is achieved through a die split mechanism; meanwhile, in the disassembly and assembly process, the prefabricated member is not required to be carried and overturned, so that the prefabricated member is prevented from being damaged; and specifically, the die is composed of a first master die, a second master die, a first slave die and a second slave die, during form removal, firstly the first slave die and the second slave die are disassembled and assembled, and then one of the first master die or the second master die is removed, so that the demoulding of the prefabricated member is realized.

The invention discloses a table locking method and apparatus, pertaining to the technical field of computers.The method comprises following steps: determining locking regions needed to be locked in an original table after a browser renders the original table; generating a locking table composed of unit grids corresponding to the locking regions; and maintaining that the initial position of the locking table is the same as that of the original table and covering the locking table to the original table for display. The table locking method and apparatus have following beneficial effects: the locking regions of the original table needed to be locked and rendered in the browser are combined to be the locking table; the initial position of the locking table is kept the same as that of the original table; the locking table is covered on the original table for display; the problem in the prior art that tables locked in an Excel program make it impossible to display tables in the browser is solved; and the effect of locking tables in a Web application program is achieved.

The invention discloses a detachable endoscope anastomat, and the endoscope anastomat comprises a fixed handle, an adjusting shifting piece and a drying mechanism; a movable handle is rotatably connected to the left side of the bottom of the fixed handle, the adjusting shifting piece penetrates through a dial to be rotatably connected to a connecting sleeve, and a first gun barrel is fixed to the left end of the connecting sleeve; the left end of the first gun barrel is connected with a second gun barrel in a clamped mode, the left end of the second gun barrel is rotationally connected with a nail bin base, and the drying mechanism is clamped on the protective cover. According to the detachable endoscope anastomat, when the second gun barrel and the first gun barrel are connected together in a left-right clamped mode through the connecting rod and the connecting block, the second arrow indication mark corresponds to the first arrow indication mark, and then the second gun barrel is manually rotated till the second arrow indication mark corresponds to the rotation in-place indication mark; at the moment, the sliding block slides in place in the second sliding groove, the locking effect is conveniently achieved, and after the device is used and the operation is reversely repeated, the second gun barrel and the first gun barrel can be detached.

The invention discloses a high-redundancy insertion-pin-type connecting mechanism used for space truss connection. The high-redundancy insertion-pin-type connecting mechanism comprises a connector anda connecting groove, wherein the connecting groove is provided with a groove part; the connector is provided with a protruding part; the protruding part of the connector is in cooperative connectionwith the groove part of the connecting groove; a first magnet is arranged at the bottom of the groove part; a second magnet generating the attractive force with the first magnet is arranged at the topof the protruding part; a plurality of insertion pins are arranged around the connecting groove; first magnetic poles are arranged at the top ends of the insertion pins; insertion holes correspondingto the insertion pins are arranged around the protruding part; the insertion holes are provided with second magnetic poles generating the attractive force with the first magnetic poles; and the second magnetic poles attract the first magnetic poles so that the insertion pins can be inserted into the insertion holes.

The invention relates to the field of medical instruments, in particular to an integrally detachable valve clamp and a conveying system thereof, the integrally detachable valve clamp comprises a control handle, a conveying catheter connected with the control handle and a valve clamp connected with the conveying catheter, the valve clamp is provided with an inner pipe and an outer connecting pipe, and the inner pipe and the outer connecting pipe are both provided with detachable connecting mechanisms; the conveying catheter comprises a first conveying pipe, a center control piece and a second conveying pipe, and detachable connecting mechanisms matched with the detachable connecting mechanisms are arranged at the far end of the first conveying pipe and the far end of the second conveying pipe correspondingly. The detachable connecting mechanism on the inner pipe is connected with the detachable connecting mechanism on the first conveying pipe through the middle control piece to form a first detaching part, the detachable connecting mechanism on the outer connecting pipe is connected with the detachable connecting mechanism on the second conveying pipe through the middle control piece to form a second detaching part, and when the middle control piece is moved away from the first detaching part and the second detaching part, the detachable connecting mechanism on the outer connecting pipe is detached. The first conveying pipe is separated from the inner pipe, and the second conveying pipe is separated from the outer connecting pipe.

The invention discloses an industrial forging robot multifunctional clamping manipulator, which comprises a base, a first motor, an electric telescopic column and an ash removal mechanism, wherein the upper end surface of the base is slidably connected with a moving seat, the bottom of a motor box is rotatably connected with a bearing frame, the electric telescopic column is fixed to the outer side of a clamping plate, a moving plate is slidably connected to the outer end surface of the clamping plate, and the ash removal mechanism is fixed to the bearing frame. According to the industrial forging robot multifunctional clamping manipulator, clamping plates or a suction disc can be selected to be used according to specific requirements before the industrial forging robot multifunctional clamping manipulator is used, when the clamping plates are selected to be used, a belt transmission device rotates, a lead screw rotates along with the belt transmission device, and the two clamping plates get close to each other at the moment so as to conveniently clamp the material, when the suction disc is selected to be used, a moving plate and the suction disc need to be integrally lowered, and then the material can be sucked through the suction disc, and after the material is clamped through the clamping plates or sucked through the suction disc, the spray head blows air downwards, so that dust on the surface of the material is conveniently removed, and the automatic dust removal effect is achieved.

The invention discloses a visual puncture outfit capable of adjusting a shooting angle. The outfit comprises a puncture sleeve, a lighting mechanism, an air outlet valve and a puncture cone, a limiting plate is slidably connected to the top of a moving seat, a storage groove is formed in the outer end face of the moving seat, and the outer end of a second electric telescopic rod is connected with a bearing block. A storage groove is formed in the moving seat, the lighting mechanism is arranged in the bottom of the moving seat, the air outlet valve is fixed to the left side of the top of the puncture sleeve in a penetrating mode, and the bottom of the puncture cone is connected to the right side of the upper end face of a bearing clamping seat in a clamped mode. According to the visual puncture outfit capable of adjusting the shooting angle, after the puncture sleeve and the puncture cone are assembled and fixed, the bearing block can move outwards under the extension effect of the second electric telescopic rod, then the camera can be used for shooting the internal environment of the abdominal cavity, and the angle of the camera can be adjusted through a first motor; and the shooting range is increased conveniently.

The invention relates to a dual-use device for shoveling and bulldozing, comprising a cab and a steering gear. The steering gear is provided with a shoveling device and a bulldozing device. The cab is internally provided with a brake gear and a seat positioning device. The shoveling device comprises a shoveling arm and a bucket which is detachably mounted on the shoveling arm. The steering gear is provided with a shoveling arm connecting device, and the shoveling arm is mounted on the shoveling arm connecting device. The bulldozing device and the shoveling device are mounted on a same shop truck at the same time, so that a shovel and a bulldozer are integrated, and manpower and material resources are saved; a supporting arm and air cylinder mounting shafts are connected through bolts and other equipment in the bulldozer, so that the dual-use device for shoveling and bulldozing can move more freely, and operation can be quite convenient.

The invention discloses an automatic industrial washing machine door sealing device which comprises a machine door body. A first fixing block is welded on one side of the machine door body, a first installing hole is formed in the first fixing block, a rotary shaft is rotatably installed in the first installing hole, a door body fixing rack is welded on the rotary shaft, a door body buffer rack is installed in the door body fixing rack in a sliding mode and is matched with the door body fixing rack, multiple rubber air bags are welded on the inner wall of the bottom of the door body fixing rack in an equal distance mode, multiple second installing holes are formed in the door body buffer rack, rubber air bags are installed in the second installing holes in a sliding mode, and the second installing holes are matched with the rubber air bags. The automatic industrial washing machine door sealing device is simple in structural principle, and an air spring air cylinder pushes a first clamping column to be clamped into a first clamping groove so as to achieve a machine door locking effect. The rubber air bag pushes the door body buffer rack and extrudes a machine door, so that a machine door periphery seal ring is matched with the machine door body in a sealed mode, and a comprehensive machine door sealing effect is achieved.

The invention relates to the technical field of biological experiment equipment, and discloses a biological experiment oscillation device for detecting speed limit by using centrifugation. The biological experiment oscillation device comprises an output shaft, one end of the output shaft is fixedly connected with an oscillation shaft, the outer side wall of the oscillation shaft is fixedly connected with a detection ring and a speed limit ring, and the inner side wall of the detection ring is fixedly connected with a sliding rail; and one end of the sliding rail is fixedly connected with a detection base, and the inner side wall of the sliding rail is slidably connected with a centrifugal lead ball. When the oscillation speed is too high, the centrifugal force borne by the centrifugal leadball is increased, the pressure exerted by the centrifugal lead ball on an arc-shaped spring piece is larger than the elastic force of the arc-shaped spring piece, the surface of the arc-shaped spring piece is elastically deformed, the arc-shaped spring piece drives a trigger frame to move towards one side of an alarm device, the trigger frame triggers a switch on the alarm device, and thus the alarm device gives an alarm, so that an experimenter can know the oscillation state of a test tube in time, and the experimenter can conveniently adjust the device in time.

The invention relates to an assembled concrete prefabricated component mold, including a mold mechanism and a supporting mechanism; in the invention, the mold adopts an assembled structure, so that when the prefabricated component is molded and demolded, the mold mechanism can be disassembled to achieve convenient disassembly and assembly of the prefabricated At the same time, during the disassembly process, there is no need to carry and flip the prefabricated components, so as to prevent the damage of the prefabricated components. Specifically, the mold consists of No. 1 master mold, No. 2 master mold, No. 1 slave mold and No. 2 Assembling the slave molds, when removing the molds, first disassemble the No. 1 slave mold and the No. 2 slave mold, and then remove one of the No. 1 master mold or No. 2 master mold, so that the demoulding of the prefabricated component can be realized.

The invention discloses an on-site detecting device of performances of a building envelope member. The on-site detecting device comprises a bottom box, a horizontal power sliding device, an extrusiondevice, an envelope member performance detecting device and a horizontal plate. Two sides of the bottom end of the horizontal plate are fixedly connected to dovetail sliding blocks. The dovetail sliding blocks are slidably disposed in dovetail rails in two sides of the top of the bottom box. The middle of the bottom end of the horizontal plate is slidably connected to the middle of the top of thebottom box through a horizontal power sliding device. Vertical plates are vertically disposed on both sides of the top of the horizontal plate. The adjacent sides of the vertical plates are provided with U-shaped sliding rails. A lifting plate is slidably arranged between the two U-shaped sliding rails. Through the envelope member performance detecting device, the tensile performance of the envelope member can be detected on site. The on-site detecting device is easy to operate. A tension spring is clamped inside a tension spring fixing hole, facilitates replacement of different tension springs for different envelope members based on a worker and satisfies the tension detection requirements on different envelope members.

The present invention relates to a one-way clutch in which a forward key (20b) of an output part (12) is locked and a bi-directional rotation of the output part (12) can be controlled by means of an input part (13). That is, the present invention relates to a one-way clutch comprising: a fixation part (11) provided at either an inner side or an outer side of a clutch part; an output part (12) provided at a position corresponding to the fixation part (11); an input part (13) provided between the fixation part (11) and the output part (12); and a forward key means (21) provided on the output part (12) for locking a forward key of the output part (12). Accordingly, the present invention comprises an input part (13) provided between the fixation part (11) and the output part (12); and a forward key means (21) for key-locking the output part (12) in the forward direction, such that the forward rotation of the output part (12) is key-locked by means of the forward key means (21) and the key locking of the forward key means (21) is released by means of the input part (13), so that the output part (12) is rotated in the forward direction by means of the input part (13) and the output part (12) is rotated in the reverse direction by means of the input part (13). As such, the present invention has an effect wherein the output part (12) is rotated in the forward and reverse directions by means of the input part (13).

The invention relates to non-cerium rare earth equipment, in particular to equipment for selectively extracting non-cerium rare earth in mixed rare earth concentrate. The invention provides the equipment for selectively extracting the non-cerium rare earth in the mixed rare earth concentrate, and the equipment has the advantages of automatic extraction, good extraction effect and simple and understandable operation. The equipment for selectively extracting the non-cerium rare earth in the mixed rare earth concentrate comprises a first mounting frame, a second mounting frame, a discharging frame, a filtering mechanism, a filtering box and a blocking mechanism, and the second mounting frame is arranged in the middle of the first mounting frame; the discharging frame is arranged between the two sides of the first mounting frame; the filtering mechanism is arranged in the second mounting frame; the filtering box is arranged on the filtering mechanism in a sliding manner; and the top of the second mounting frame is provided with the blocking mechanism. Two first movable rods both move leftwards to be reset, so that the filtering box moves leftwards to be reset, the rare earth concentrate can be filtered and screened through left-right movement of the filtering box, the rare earth concentrate can be extracted, and the filtering effect is achieved.

The invention discloses a children multifunctional safety lock and relates to the technical field of safety locks. The children multifunctional safety lock comprises a base, a button, a pressing spring, a positioning block, a limiting body and a torsion spring. The base is connected with the positioning block through a first buckle, one end of the pressing spring abuts against the button, and theother end of the pressing spring abuts against the positioning block. The button is connected with the positioning block through a second buckle. A positioning groove matched with the second buckle isformed in the bottom of the positioning block. A locking block is arranged on one side of the top of the base, and a locking groove matched with the locking block is formed in the limiting body. Oneend of the torsion spring is connected with the limiting body, and the other end of the torsion spring is connected with the base. The children multifunctional safety lock has the beneficial effects that the design that the lock can only be opened through double ways is adopted, two steps are needed for opening, double protection is adopted for preventing opening, and the lock can be safer and more reliable; and one-key locking can be achieved, automatic locking can be achieved simply by pressing the button slightly, and use is convenient.

The invention discloses an unmanned aerial vehicle wing multidirectional-locking mechanism. The unmanned aerial vehicle wing multidirectional-locking mechanism comprises a wing rotating shaft and an annular protection sleeve, cylindrical grooves are arranged at the inner side of the annular protection sleeve, the groove bottom of every cylindrical groove is provided with a threaded hole perpendicular to the groove bottom of the cylindrical groove, a pressure plate is arranged in every cylindrical groove, a fixed circular ring perpendicular to the groove wall of every cylindrical groove is arranged at the outer side of the pressure plate, the sidewall of the fixed circular ring is fixedly connected with the inner wall of the corresponding cylindrical groove, a return spring is arranged between the pressure plate and the fixed circular ring, two ends of the return spring are respectively fixedly connected with the inner side of a limiting circular ring and the outer side of the pressureplate, a telescopic rod is arranged in the circular hole of the fixed circular ring, one end of the telescopic rod goes through the return spring and is fixedly connected with the middle part of the outer side of the pressure plate, the other end of the telescopic rod goes through the circular hole of the fixed circular ring and reaches the external of the circular groove, and vertical chutes arearranged in two sides of every circular groove to make the wing locked in multiple directions.

The invention discloses an anti-falling balloon puncture outfit comprising a puncture sleeve, an air injection valve, a threaded ring plate, a sealing mechanism, a clamping groove and a puncture cone,the bottom of the puncture sleeve is inserted into a first inserting groove, the air injection valve penetrates through the left end face of the puncture sleeve to be communicated with an air injection channel, and a rubber ring piece is arranged on the outer side of the bottom of the air injection channel; and a bearing frame is fixed to the top of the puncture sleeve, the sealing mechanism is arranged in a through hole, the through hole is formed in a sealing cover, the bottom of the puncture cone is inserted into a second inserting groove, and the second inserting groove is formed in the right side of the upper end face of the clamping base. According to the anti-falling balloon puncture outfit, after the puncture sleeve and the puncture cone are sleeved and fixed, the bottoms of the puncture sleeve and the puncture cone are inserted into the skin, then the air injection valve is opened to inject air into the air injection channel, at the moment, the rubber ring piece expands, thebottom of the puncture sleeve can be firmly fixed in the body conveniently, and therefore the anti-falling effect is achieved.

The invention relates to the technical field of essence facial masks, in particular to an acne-removing and freckle-removing essence mask and a preparation method thereof, and the acne-removing and freckle-removing essence mask comprises a facial mask, essence and a packaging bag; the facial mask is stored in the packaging bag; the facial mask comprises a face layer and a liquid injection unit, the face layer is in a face shape, and the face layer comprises a main layer and an auxiliary layer; the edges of the main layer and the auxiliary layer are bonded through an adhesive, and a first cavity is formed between the main layer and the auxiliary layer; the essence is put into the liquid storage bag in advance, so that a worker presses the liquid storage bag after attaching a mask to the face, the mask applying process is achieved, the situation that the essence in a packaging bag is wasted is avoided, the mask using cost is reduced, the force for extruding the liquid storage bag is controlled through the absorption efficiency of the face, and thus the amount of essence in the surface layer is ensured, and the use effect of the essence is improved; meanwhile, the situation that the facial mask falls off in the speaking process of the worker can be prevented.

Disclosed is a stage leveling device for a high-performance mask aligner, having enhanced leveling maintenance and, in particular, a novel technology of preventing leveling misalignment by firmly fixing a leveling-completed wafer stage. A conventional leveling device fixes a leveling-completed wafer stage by partially pressing side surfaces of a leveling rod and thus the leveling is misaligned dueto deviations (errors) occurring while the leveling rod is moved upward and downward and leftward and rightward, and slip occurs due to a weak fixing strength of the leveling rod and thus the weightof the wafer (sample) that can be leveled to the maximum extent is decreased. To address the problems described above, according to the present invention, when a locking ring (80) inserted at an outerside of a leveling rod (40;41) maintains an inclined state, locking is performed such that an inner circumferential surface of the locking ring fixes opposite sides of the leveling rod by applying pressure thereto and, when the locking ring maintains a horizontal state, unlocking is performed such that the inner circumferential surface of the locking ring is spaced apart from the leveling rod.

The invention relates to a chain saw which is provided with a guide plate and a chain and comprises a machine shell, a driving assembly installed in the machine shell and a fixing assembly for tensioning the chain and locking the guide plate. The fixing assembly comprises a protective cover abutting against the guide plate, a rotary knob arranged on the outer side of the protective cover, a tensioning piece driven by the rotary knob, a locking piece connected to the protective cover in a clamped mode and an elastic piece located between the rotary knob and the locking piece, a first clamping part is arranged on the side, facing the locking piece, of the protective cover, a second clamping part is arranged on the side, facing the protective cover, of the locking piece, and when the guide plate is locked, the first clamping part is clamped to the second clamping part. The elastic piece deforms and abuts against the locking piece, so that the second clamping part is clamped to the first clamping part. The first clamping part is arranged on the protective cover, the second clamping part is arranged on the locking piece, the two clamping parts are clamped with each other, under the action of the elastic piece, the locking piece and the protective cover are difficult to generate relative movement, and the guide plate is difficult to loosen.

The invention discloses a top disk lockable hydraulic jack with a safety valve. The hydraulic jack comprises a jack body and a top disk body. The top disk body is fixedly connected to the top of the jack body. The side surface of the top disk body is fixedly connected with one ends of guide rods. The other ends of the guide rods are movably connected with the inner wall of a round tube. The surfaces of the guide rods are movably sleeved with two movable rods. The two movable rods are located on the two sides of the top disk body correspondingly. The sides, far away from the top disk body, of the movable rods are in lap joint with the inner wall of the round tube. The tops of the movable rods are fixedly connected with movable blocks. Internal threaded pipes are inlaid in the movable rods and located below the guide rods. The top disk lockable hydraulic jack is provided with the guide rods, the round tube, the movable blocks, threaded pipes and antiskid pads, and the problems that a topdisk of an existing common hydraulic jack with a safety valve and a heavy weight can be fixed relatively and is low in safety is solved.

The invention discloses foldable planar three-phase open transformer iron core. The foldable planar three-phase open transformer iron core comprises two inner-ring single-frame iron cores and an outer-ring single-frame iron core, wherein each of each inner-ring single-frame iron core and the outer-ring single-frame iron core is formed by sequentially stacking an inner-layer material band group, a middle-layer material band group and an outer-layer material band group, the openings of a single-ring material band frame forming the inner-layer material band group are symmetrically formed in the upper end of a single-frame iron core column, the openings of a single-ring material band frame forming the middle-layer material band group are symmetrically formed in the upper end of the single-frame iron core column and a bent slope between the single-frame iron core column and a single-frame iron core upper yoke, and the openings of a single-ring material band frame are symmetrically formed in the upper end of the single-frame iron core column, the bent slope between the single-frame iron core column and the single-frame iron core upper yoke and two ends of the single-frame iron core upper yoke, and the distance between each opening of each single-ring material band frame and a bent angle closet to the opening is not smaller than 5mm. The foldable planar three-phase open transformer iron core is high in mechanical strength, high in sudden short-circuit resistance and high in plug-in mounting efficiency.