44results about How to "Increase the difficulty of disassembly" patented technology

The invention discloses a cloth winding roller for the ending stage of textile printing and dyeing. The cloth winding roller for the ending stage of textile printing and dyeing comprises an expandingshaft and a winding cylinder arranged on the outer side of the expanding shaft; the expanding shaft comprises a cylindrical shaft body, a plunger piston, an expanding pin retainer and a plurality of expanding pins; the cylindrical shaft body comprises a shaft body inner surface and a shaft body outer surface; a first shaft end opening and a second shaft end opening are formed at the left end and the right end of the cylindrical shaft body correspondingly; the first shaft end opening communicates with the second shaft end opening through a hollow shaft cavity; and the cylindrical shaft body isprovided with a plurality of main body openings. Fixation and disassembling of the outer winding cylinder can be realized through cooperation of the plunger piston and the expanding pins, the windingcylinder is positioned effectively, the cloth winding roller for the ending stage of textile printing and dyeing is simple in structure and easy to operate, and the fixing and disassembling difficultyof the winding cylinder is greatly enhanced.

The invention discloses an ATM machine keyboard with good safety. The machine keyboard comprises a keyboard panel, a key frame, a silica gel gasket, a keyboard base plate, a keyboard mainboard and a keyboard rear cover, wherein the keyboard panel, the key frame, the silica gel gasket, the keyboard base plate, the keyboard mainboard and the keyboard rear cover are sequentially arranged from front to back, the keyboard panel, the key frame, the silica gel gasket and the keyboard base plate are sequentially connected, the keyboard mainboard and the keyboard rear cover are respectively connected with the keyboard base plate, a plurality of keys are arranged on the key frame, a plurality of button protrusions matched with the keys are arranged on the silica gel gasket, a controller is arranged on the lower surface of the keyboard mainboard, a state indicator lamp is arranged on the keyboard panel, and the state indicator lamp is electrically connected with the controller. The ATM machine keyboard has the advantages that disassembling difficulty of the keyboard is large, the anti-attack capability is strong, the data safety is good, the state indicating function is obtained, the risks of information leakage and property damage of a cardholder are reduced, and it is ensured that money in an account of the cardholder is not prone to being stolen.

The invention relates to a novel multifunction experimental training working table for a stamped die. The novel multifunction experimental training working table comprises a working table body, the stamped die and a die storage support for containing the stamped die. The working table body is of a three-layer platform structure formed by four supporting columns and three flat plates installed on the supporting columns, a first-layer platform is provided with a die disassembling and assembling locating groove, a die assembling hole and a vise assembling hole form top to bottom, a second-layer platform is provided with a tool and measuring implement storage box, a vise can be stored in a third-layer platform, the die storage support is a support provided with a two-layer frame structure and is installed on the first-layer platform, and a computer is further assembled on the first-layer platform. The novel multifunction experimental training working table for the stamped die has five functions, is highly integrated, and completely meets the experimental training teaching requirement of the stamping course; the die structure is simplified, disassembling and assembling are easily achieved, and stamping simulation is simple and convenient to operate; the structure is compact, and the practicability is high; stamping course experimental training multimedia and actual operation comprehensive three-dimensional teaching are achieved.

The invention discloses an EPP keyboard good in confidentiality. The EPP keyboard comprises a keyboard panel, a frame comprising a plurality of key limiting frames, metal keys with the same number as the key limiting frames, a plastic spacer, a keyboard bottom plate, a keyboard sensing plate, a core circuit board, a core protection cover and a rear keyboard cover, wherein the keyboard panel, the frame, the metal keys, the plastic spacer, the keyboard bottom plate, the keyboard sensing plate, the core circuit board, the core protection cover and the rear keyboard cover are sequentially arranged from front to back. The metal keys are arranged in the key limiting frames respectively. The keyboard panel is connected with the frame, the plastic spacer and the keyboard bottom plate sequentially. The keyboard sensing plate is connected with the core circuit board and the core protection cover sequentially. The rear keyboard cover covers the core protection cover and is connected with the plastic spacer and the keyboard bottom plate. The EPP keyboard has the advantages of being large in disassembly difficulty, high in attack resistance and good in data security, lowering the risk of information leakage and property loss of cardholders and guaranteeing that money of the accounts of the cardholders can not be stolen easily.

The invention relates to a crankset, an auxiliary wheel, a flywheel and an anti-off chain transmission device. The crankset, the auxiliary wheel and the flywheel each are provided with two protectivebaffles, so that the whole chain transmission device forms a complete adaptive anti-off scheme. At the same time, the baffle located on the crankset is provided with a notch, a maintenance plate is configured at the position of the notch, and thus a chain can be installed or dismantled by opening the maintenance plate. According to the anti-off chain transmission device, by opening the maintenanceplate before the chain ages to natural vibration and dropping, the chain can pass through the notch, and thus the installing and dismantling of the chain are achieved through synchronous rotation ofthe crankset and the chain.

The invention provides a liquid crystal screen safety disassembling prevention structure and method. A safety line is etched at the edge position of a liquid crystal screen, is led out by a FPC and extends to a limiting structure; the FPC is fixed by the limiting structure and a zebra bar together so as to enable the FPC to be in a tightened state; edge glass of the liquid crystal screen is used as one part of the safety disassembling prevention structure; the edge glass of the liquid crystal screen is relatively weak and the edge glass of the liquid crystal screen is easy to damage in the disassembling process to trigger a safety mechanism, and thus, the FPC is fixed by the limiting structure and the zebra bar together so as to enable the FPC to be in the tightened state, and in a case ofnot damaging the FPC, even though the liquid crystal screen safety disassembling prevention structure is known, the liquid crystal screen also cannot be disassembled from the front side; and the FPCis in the tightened state, and thus, when liquid crystals are tried to be taken out, breakage of the FPC can be caused to trigger the safety mechanism, so that the disassembling difficulty is improved; and resistance values for the zebra bar to access a circuit are different under the action of different pressures, so that safety is higher.

The invention discloses an EPP keyboard with good secrecy performance. The EPP keyboard comprises a keyboard panel, a frame, a plurality of metal keys, a plastic gasket, a keyboard base plate, a keyboard sensing plate, a core circuit board, a core protective cover and a keyboard rear cover, wherein the keyboard panel, the frame, the metal keys, the plastic gasket, the keyboard base plate, the keyboard sensing plate, the core circuit board, the core protective cover and the keyboard rear cover are sequentially arranged from top to bottom, the metal keys are connected with the frame, the keyboard panel is sequentially connected with the frame, the plastic gasket and the keyboard base plate, the keyboard sensing plate is sequentially connected with the core circuit board and the core protective cover, and the keyboard rear cover covers the core protective cover and the plastic gasket and is connected with the keyboard base plate. The keyboard has the advantages that the disassembling difficulty is large, the anti-attack capability is strong, data safety is good, the risks of information leakage and property damage of a cardholder are reduced, and it is ensured that money in an account of the cardholder is not prone to being stolen.

The invention discloses a de-soldering method for elements with bottom terminal packaging and aims at providing a de-soldering method which is short in operation time and capable of not burning elements and printed boards. According to the technical scheme, a silver plated copper wire with the diameter phi in a range of 0.08mm to 0.12mm is used for winding the element body (1) and printed circuit board (6) joint portion for two circles, and the length of the silver plated copper wire is that the silver plated copper wire can wind the element body for at least two circles. The silver plated copper wire is attached to the soldering disc exposure portions of the element body (1) and printed circuit board soldering pad (7) bottom soldering point connection positions and exposed terminal side portions (3) of bottom terminals (4) of the element body (1) to wound all soldering points; the exposed silver plated copper wire is heated directly through electric soldering iron, a certain amount of soldering flux is added at the position of a soldering tip while the silver plated copper wire is heated, heat is transmitted to the bottom terminals and the printed circuit board soldering disc through the silver plated copper wire and the exposed fused soldering flux directly, and all heat is concentrated to the soldering points rapidly, accordingly, the apparatus is taken down.

The invention discloses a gas meter accurate in counting and having an anti-tamper structure. The gas meter comprises a meter case and a counter. The counter is provided with a counter wheel carrier which is clamped and fixed, and a counter housing. The counter housing is in a single-screw anti-tamper structure. The counter is provided with a counter wheel train with a change gear pair and a transition gear pair. A driving change gear forms the input end of the wheel train, and a driven change gear is tightly cooperated with a driving transition gear through a bulge loop section which is formed on the middle part of the driving transition gear. The driven change gear forms coaxial fixation through the driving transition gear, and is rotatably cooperated with an inner section of a supporting shaft. The driving transition gear is on the outer section of the supporting shaft. The inner side of the cooperation section of the supporting shaft is provided with a driven change gear spacing shaft shoulder. The front end of the cooperation section of the supporting shaft is provided with a crossette which stops the driving transition gear from withdrawing. The driven transition gear is connected with the first-level counter wheel of the counting wheel set through worm-gears. Beneficial effects of the gas meter are that counting is accurate, the counter wheel carrier is convenient and rapid in mounting and dismounting, and the counter housing has good anti-tamper structure.

The invention discloses an ATM keyboard with good safety. The ATM keyboard comprises a keyboard panel, a key frame, a plurality of keys, a silica gel gasket, a keyboard bottom plate, a main keyboard plate and a rear keyboard cover, wherein the keyboard panel, the key frame, the keys, the silica gel gasket, the keyboard bottom plate, the main keyboard plate and the rear keyboard cover are sequentially arranged from front to back, and the keys are arranged on the key frame. The keyboard panel, the key frame, the silica gel gasket and the keyboard bottom plate are sequentially connected, and the main keyboard plate and the rear keyboard cover are connected with the keyboard bottom plate. The silica gel gasket is provided with a plurality of button protrusions matched with the keys. A controller is arranged on the lower surface of the main keyboard plate. The keyboard panel is provided with a state indicator lamp electrically connected with the controller. The ATM keyboard has the advantages that the disassembly difficulty is large, the attack resistance is high and the data security is good; the state indicator lamp can give state indication to lower the risk of information leakage and property loss of cardholders and guarantee that money of the accounts of the cardholders can not be stolen easily.

The invention discloses a polishing sheet for polishing machine comprises an upper polishing sheet and a lower polishing sheet. The upper polishing sheet comprises an upper layer polishing sheet and a lower layer polishing sheet. Several matched through holes are provided between the upper layer polishing sheet and the lower layer polishing sheet. A fixing device is provided inside the through hole. The upper layer polishing sheet is provided with a locating pin. The upper polishing sheet of the polishing sheet for polishing machine is divided into an upper layer polishing sheet and a lower layer polishing sheet, thus when cleaning is needed, only the lower layer polishing sheet needs to be detached, avoiding increased detachment difficulty caused by excessive weight of the whole polishing sheet and providing great convenience to the detachment and installation.

The invention is suitable for the technical field of coal instruments, and provides a rapid dismounting device for a bearing of a supporting shaft of an armor belt coal feeder and a use method for the rapid dismounting device. The rapid dismounting device comprises a lead screw, one end of the lead screw penetrates through a leveraging assembly and then abuts against the supporting shaft fixedly connected with the bearing, a thrust assembly is arranged on the side, away from the leveraging assembly, of the bearing, a connecting part is arranged between the leveraging assembly and the thrust assembly, the leveraging assembly and the thrust assembly are connected to a base in a sliding mode, and an adjusting part is arranged on the thrust assembly. Therefore, the rapid dismounting device and the use method thereof have the advantages that it can be guaranteed that the thrust applied to the bearing is in the same direction and is uniform, the bearing can be smoothly dismounted, the situation that the bearing dismounting difficulty is increased due to the fact that the direction of the force deviates can be avoided, bearings of various sizes can be dismounted, and the practicability of the device is improved.

The invention discloses an anti-theft device for base station storage batteries. The storage batteries are connected with one another in series through electrodes to form a storage battery pack, wherein threaded holes are formed on the electrodes of the storage batteries. The anti-theft device comprises a connecting piece for connecting two adjacent storage battery motors, bolts in threaded connection with the threaded holes, and a wrench for screwing the bolts. The anti-theft device for the base station storage batteries has the advantages that a drawing type connecting piece is adopted to ensure that the anti-theft device can be arranged more simply and easily and is wider in applicable specification; and a specific bolt is hidden in a cavity of the connecting piece, and can only be screwed by a corresponding special wrench which is stretched into the cavity to clamp the bolt head, so that the dismounting difficulty is greatly increased, and the anti-theft performance is improved.

The invention discloses an anti-theft municipal inspection well cover. The anti-theft municipal inspection well cover comprises a well seat and a well cover body. A bearing seat is horizontally constructed on the inner wall of the upper end of the well seat. A bearing rod is perpendicularly welded to one side of the bearing seat. The bearing rod is sleeved with a strong spring. The fixed end of the well cover body is rotatably arranged on the bearing rod in a sleeving mode. The well cover body abuts against the strong spring. The side, far away from the fixed end, of the well cover body is provided with a first-stage vertical slot and a first-stage horizontal slot. A handle is rotatably arranged in the first-stage vertical slot. According to the anti-theft municipal inspection well cover,the well cover body and the well seat are integrated to improve the stability of the well cover body and the well seat; the well cover body and the well seat are mounted in a secret mode through a built-in plug pin and a built-in limiting pin to be prevented from being found easily by a thief. Limitation to the plug pin is stopped by pressing the well cover and adsorbing a fixed magnet and the limiting pin through a movable magnet so that the thief is not likely to found the limiting pin. A person cannot rotate the plug pin through the handle, so that the opening difficulty of the well cover is improved, and the anti-theft protection effect on the well cover is achieved.

The invention discloses a building glass curtain wall structure which is easy to assemble and disassemble and has a self-locking structure. The longitudinal fixing frame is connected with the rear panel through the first fixing screw, and expansion wall nails are installed on both sides of the rear panel. There are two horizontal fixed frames arranged symmetrically with respect to the central axis of the vertical fixed frame, and the two horizontal fixed frames are respectively installed on both sides of the vertical fixed frame, and the cover panel is installed on a side of the vertical fixed frame far away from the rear plate. On the other hand, there are two glass curtain walls arranged symmetrically with respect to the central axis of the covering panel, and both ends of the glass curtain wall are groove-shaped structures. The sequence is reasonable, and the vertical fixing frame, the horizontal fixing frame and the covering panel are three independent parts, and they support each other after being connected as a whole, which improves the stability of the whole when in use.

The invention discloses a gas meter accurate in counting and having an anti-tamper structure. The gas meter comprises a meter case and a counter. The counter is provided with a counter wheel carrier which is clamped and fixed, and a counter housing. The counter housing is in a single-screw anti-tamper structure. The counter is provided with a counter wheel train with a change gear pair and a transition gear pair. A driving change gear forms the input end of the wheel train, and a driven change gear is tightly cooperated with a driving transition gear through a bulge loop section which is formed on the middle part of the driving transition gear. The driven change gear forms coaxial fixation through the driving transition gear, and is rotatably cooperated with an inner section of a supporting shaft. The driving transition gear is on the outer section of the supporting shaft. The inner side of the cooperation section of the supporting shaft is provided with a driven change gear spacing shaft shoulder. The front end of the cooperation section of the supporting shaft is provided with a crossette which stops the driving transition gear from withdrawing. The driven transition gear is connected with the first-level counter wheel of the counting wheel set through worm-gears. Beneficial effects of the gas meter are that counting is accurate, the counter wheel carrier is convenient and rapid in mounting and dismounting, and the counter housing has good anti-tamper structure.

The outer package clamping device comprises a rivet sleeve and a rivet core located in the rivet sleeve, the rivet core at least comprises a rivet core plate, the rivet sleeve is provided with hollow rivet sleeve plates matched with the rivet core plates, one end of each rivet core plate is connected with the bottom end of the corresponding rivet sleeve plate, and the other end of each rivet core plate is exposed out of the top end of the corresponding rivet sleeve plate; the edge of the top end of each riveting sleeve plate is provided with a protruding edge, a plurality of foldable strips are arranged on the riveting sleeve plates at intervals, when the riveting core plate is pulled, the foldable strips are folded outwards to form a plurality of protrusions, and the protrusions surround the peripheries of the riveting sleeve plates. When the packaging box is used, the plurality of foldable strips form bulges in the packaging box, so that the packaging box is very convenient to install and use; the clamping device is simple in structure and good in clamping effect, when the clamping device needs to be disassembled, due to the multiple protrusions in the clamping device, rivet holes of the packaging box have to be damaged to disassemble the clamping device, disassembly traces are left, the good anti-fake effect is achieved, and the problem that an existing riveting structure is poor in anti-fake effect is solved.

The invention relates to a novel multifunction experimental training working table for a stamped die. The novel multifunction experimental training working table comprises a working table body, the stamped die and a die storage support for containing the stamped die. The working table body is of a three-layer platform structure formed by four supporting columns and three flat plates installed on the supporting columns, a first-layer platform is provided with a die disassembling and assembling locating groove, a die assembling hole and a vise assembling hole form top to bottom, a second-layer platform is provided with a tool and measuring implement storage box, a vise can be stored in a third-layer platform, the die storage support is a support provided with a two-layer frame structure and is installed on the first-layer platform, and a computer is further assembled on the first-layer platform. The novel multifunction experimental training working table for the stamped die has five functions, is highly integrated, and completely meets the experimental training teaching requirement of the stamping course; the die structure is simplified, disassembling and assembling are easily achieved, and stamping simulation is simple and convenient to operate; the structure is compact, and the practicability is high; stamping course experimental training multimedia and actual operation comprehensive three-dimensional teaching are achieved.

The invention discloses an EPP keyboard with good secrecy performance. The EPP keyboard comprises a keyboard panel, a frame, a plurality of metal keys, a plastic gasket, a keyboard base plate, a keyboard sensing plate, a core circuit board, a core protective cover and a keyboard rear cover, wherein the keyboard panel, the frame, the metal keys, the plastic gasket, the keyboard base plate, the keyboard sensing plate, the core circuit board, the core protective cover and the keyboard rear cover are sequentially arranged from top to bottom, the metal keys are connected with the frame, the keyboard panel is sequentially connected with the frame, the plastic gasket and the keyboard base plate, the keyboard sensing plate is sequentially connected with the core circuit board and the core protective cover, and the keyboard rear cover covers the core protective cover and the plastic gasket and is connected with the keyboard base plate. The keyboard has the advantages that the disassembling difficulty is large, the anti-attack capability is strong, data safety is good, the risks of information leakage and property damage of a cardholder are reduced, and it is ensured that money in an account of the cardholder is not prone to being stolen.

The invention relates to theft-proof nut and matching spinner and its using method. The theft-proof nut includes nut body and spinner. The outer surface of the former is revolution body and set one notch or screw hole; the outer shape of the latter is formed a section of normal nut shape and set corresponding notch or screw through hole. Its using method is that the spinner body is do muff coupling with theft-proof nut body. It has the advantages of simple and reasonable structure, and good theft-proof performance.

The device (10) has a housing (18) connected to a drive motor (11) that is indirectly connected to a custom connector (20) for controlling the drive motor. The custom connector is partially inserted into a receptacle (22) of the housing. The custom connector is fixed to the housing, and provides a non-destructive non-releasable fixation between the connector and the housing. A weld is designed as ultrasonic sealing connection and made of plastic material, where the custom connector and the housing are formed in a region of the weld.

The invention discloses a knob-type anti-dismantling apparatus applied to a metering system, a metering device and a metering system and belongs to the metering table technology field. In an existing metering device industry, anti-dismantling performance of the device is poor, an anti-dismantling structure is complex and there are many other problems. In the invention, the above problems are solved. The knob-type anti-dismantling apparatus comprises a box body and an anti-dismantling cover, wherein the box body is provided with an assembling port; the anti-dismantling cover is installed on the assembling port in a matching mode; the anti-dismantling cover includes an inner cover and an outer cover which are rotatably connected; the anti-dismantling cover possesses a locking state and an unlocking state; under the locking state, the anti-dismantling cover is locked on the box body; under the unlocking state, locking of the anti-dismantling cover is relieved; and the inner cover is rotated relative to the outer cover so that the anti-dismantling cover is mutually switched between the locking state and the unlocking state. The apparatus is applied to a water meter, a fuel gas meter, a heat energy meter and the corresponding metering system.

The invention discloses a pressure reducing device for a horn mouth of a brass instrument. The pressure reducing device comprises a pressure reducer body. The left side of the pressure reducer body isconnected with an air inlet pipe. An air inlet cavity is formed in the air inlet pipe. The outer wall of the left side of the air inlet pipe is in threaded connection with a sleeve A. An exhaust pipeis connected to the right side of the pressure reducer body, an exhaust cavity is formed in the exhaust pipe, a sleeve B is connected to the outer wall of the right side of the exhaust pipe in a threaded mode, a pressure reducing cavity is formed in the pressure reducer body, and a pressure reducing mechanism and a limiting mechanism are arranged in the pressure reducing cavity. In general, the device has the advantages of being convenient to use, capable of being connected with horn mouths and musical instruments with different pipe diameters, wide in application range, not prone to slidingduring playing and long in service life, and the horn mouths and the musical instruments cannot be abraded during mounting and dismounting.

The invention discloses an ATM user keyboard with good safety. The keyboard comprises a keyboard panel, a key frame, a plurality of keys connected with the key frame, a silica gel gasket, a keyboard base plate, a keyboard mainboard and a keyboard rear cover, wherein the keyboard panel, the key frame, the keys, the silica gel gasket, the keyboard base plate, the keyboard mainboard and the keyboard rear cover are sequentially arranged from top to bottom, a plurality of button protrusions matched with the keys are arranged on the silica gel gasket, a controller is arranged on the keyboard mainboard, key contacts matched with the button protrusions respectively are arranged on the upper surface of the keyboard mainboard, the number of the button protrusions is the same as that of the key contacts, and conductive rubber columns which are used for penetrating through the keyboard base plate and are in contact with the key contacts when the keys are pressed down are arranged on the lower surfaces of the button protrusions. The keyboard has the advantages that the keyboard disassembling difficulty is large, the anti-attack capability is strong, and the data safety is good.

The invention discloses an anti-theft municipal inspection well cover. The anti-theft municipal inspection well cover comprises a well seat and a well cover body. A bearing seat is horizontally constructed on the inner wall of the upper end of the well seat. A bearing rod is perpendicularly welded to one side of the bearing seat. The bearing rod is sleeved with a strong spring. The fixed end of the well cover body is rotatably arranged on the bearing rod in a sleeving mode. The well cover body abuts against the strong spring. The side, far away from the fixed end, of the well cover body is provided with a first-stage vertical slot and a first-stage horizontal slot. A handle is rotatably arranged in the first-stage vertical slot. According to the anti-theft municipal inspection well cover,the well cover body and the well seat are integrated to improve the stability of the well cover body and the well seat; the well cover body and the well seat are mounted in a secret mode through a built-in plug pin and a built-in limiting pin to be prevented from being found easily by a thief. Limitation to the plug pin is stopped by pressing the well cover and adsorbing a fixed magnet and the limiting pin through a movable magnet so that the thief is not likely to found the limiting pin. A person cannot rotate the plug pin through the handle, so that the opening difficulty of the well cover is improved, and the anti-theft protection effect on the well cover is achieved.

The invention provides a middle supporting locking mechanism of an electric bicycle and the electric bicycle. The middle supporting locking mechanism comprises a rear bottom fork, a support connectedwith the rear bottom fork, a middle supporting lock arranged below the support and connected with the support, and a middle support arranged below the middle supporting lock and connected with the support through a rotatable structure, wherein a limiting space is formed between the middle support and the middle supporting lock and used for preventing the middle supporting lock from being detached.By the adoption of the technical scheme, the middle supporting lock is installed below the rear bottom fork and above the middle support through the support, the position of the middle supporting lock is hidden, the limiting space is formed by the middle supporting lock and the middle support, so that the middle supporting lock is difficult to detach, and the antitheft performance of the middle supporting lock is improved; and in addition, the middle supporting lock is in bolted connection with the support through fasteners, installation is convenient, universality is good, the position is high, and the mechanism is unlikely to be crashed.

The invention discloses a tool disassembling device for a shear folding volume numerical control machine tool. The tool disassembling device comprises a handle and clamping grooves, wherein an adjusting rod is inserted into the top end of the handle, the clamping grooves are uniformly formed in the left side and the right side of the adjusting rod, a connecting groove is formed in the top end of the adjusting rod, fixing grooves are formed in the left end and the right end of a connecting block, a disassembling plate is arranged in a disassembling head, a second control groove is formed in thebottom end of the front surface of the disassembling head in a penetrating mode, and the top end of a screw rod is welded and fixed to the disassembling plate. According to the tool disassembling device, when the tool disassembling device is used by a user, the phenomenon that because the distance of a tool is long, the length of the disassembling device is insufficient and the labor is not savedcaused by slipping of the disassembling device, the disassembling difficulty is increased is avoided; and when the user needs to disassemble parts with the same type and different sizes, the disassembling device of the corresponding size is not required to be replaced, and when the user needs to replace different disassembling devices, the whole disassembling device does not need to be replaced.

The invention discloses a transformer convenient for experimental testing, which comprises a casing, the casing is provided with a connecting groove, the side wall of the casing is fixedly connected with a bending block, and the bending block is rotatably connected with a turning block. The end of the turning block is provided with a screw groove, the side wall of the housing is provided with a circular groove matching the end of the turning block, and a connecting shell is slidably connected in the connecting groove. In the present invention, when the sliding bar moves along the horizontal direction under the restriction of the fixed bar, it is affected by the elastic force of the second spring, and the force given by the second spring to the block and the force given by the third spring to the vertical block can effectively move the block in the horizontal groove. It plays a restrictive role. When the block is not affected by the force of the rotating block, the block can maintain the state of protruding from the horizontal groove, so that the block can better play the role of fixing the connecting shell and the shell, and the end of the block is fixed. The connected screw block can be threadedly connected with the screw groove so that the connection shell is engaged with the shell.

The invention relates to the technical field of hydraulic oil cylinders, in particular to a connecting structure of a hydraulic oil cylinder top cover and an oil cylinder. The connecting structure comprises a cylinder body, a top cover, a bolt and a piston rod, wherein the cylinder body is fixedly connected with the top cover through the bolt; a groove is formed in the inner wall of the cylinder body, a first tooth-shaped block is arranged in the groove, the top cover comprises an upper top cover and a lower top cover, a spring is fixedly connected between the upper top cover and the lower top cover, a second tooth-shaped block matched with the first tooth-shaped block is arranged at the bottom end of the bolt, and a first sealing ring is arranged between the upper top cover and the lower top cover; and the sealing ring is extruded and deformed, and the deformed sealing ring pushes the first tooth-shaped block in the groove to be matched with the second tooth-shaped block on the bolt so as to further fix the cylinder body and the top cover, and then the purposes of sharing the pressure borne by the connecting part of the bolt and the thread and preventing the connecting part of the bolt and the thread from being damaged due to the fact that hydraulic pressure and thermal expansion in the cylinder body exert too large force on the top cover, and consequently the connecting part of the bolt and the thread is not easy to disassemble or the thread and the surface of the joint are damaged after disassembly are achieved.