140results about How to "Anti-loose effect" patented technology

The invention discloses a hoop as well as a manufacturing method and a use method thereof. The hoop comprises a clamping belt, wherein the clamping belt is bent and formed into a hoop body with a sleeving area; the hoop body forms a superposed part; the superposed part comprises an outer-side belt body and an inner-side belt body; and the sleeving area is elliptical. The manufacturing method thereof comprises the following steps: producing a clamping belt at first, and then directly bending and forming the clamping belt into a hoop body with an elliptical sleeving area. The use method thereof comprises the following steps: directly bending and forming a clamping belt into a hoop body with a sleeving area; carrying out pre-forming treatment on the sleeving area and enabling the sleeving area to be elliptical; sleeving a pipe fitting with the hoop body, and enabling the hoop body to form abutting connection with the pipe fitting at a short shaft corresponding to the sleeving area; and further shrinking and clamping the hoop through a hoop clamping tool. The invention aims at providing a hoop; and the hoop has the advantages of being convenient to install, and capable of being effectively pre-fixed on the pipe fitting.

The invention relates to a stainless steel metal plate surface cleaning machine and a cleaning process. The cleaning machine comprises a workbench, a telescopic support and a cleaning device, the telescopic support is installed at the upper end of the workbench, and the cleaning device is mounted at the upper end of the telescopic support. The telescopic support comprises a telescopic plate and asupport plate, and the cleaning device comprises a wet spraying mechanism, a brush cleaning mechanism, a brush wiping mechanism, an air drying mechanism and a pressing mechanism. A plate enters the workbench through a conveying belt, and is wetted, cleaned, swiped and dried orderly through the wet spraying mechanism, the brush cleaning mechanism, the brush wiping mechanism and the air drying mechanism. When the plate passes through the brush cleaning mechanism, a pressing mechanism presses the brush cleaning mechanism, and a brush cleaning cam is rotated, so that the brush supporting frame isdriven to do left-right and up-down reciprocating motion in a wavy groove, and finally the cleaning brush is driven to thoroughly clean the concave-convex boundary of the plate.

The invention discloses a connection structure of a multi-span simply-supported bridge expansion joint. A bridge includes a pier, a cover beam and support bases. The connection structure includes a first steel block, anchor bolts, a fixing nut, a supporting steel plate, two L-shaped rubber pad blocks and multiple sets of fastening mechanisms. The first steel block comprises a flat steel plate anda channel steel fixedly connected with the bottom surface of the flat steel plate, and the flat steel plate is provided with through holes corresponding to the anchor bolts; a plurality of second steel blocks used for buffering and supporting are embedded into each L-shaped rubber pad block and selected from at least three of a spherical steel block, a cylindrical steel block, a triangular steel block, a cuboid steel block, a prismatic steel block, a pyramidal steel block and a circular steel block; each set of fastening mechanism includes concrete anchor blocks and prestressed steel bars. A mode of combination of rigid connection and flexible connection is adopted, not only can the requirements of using strength be met, but also the effect of elastic damping and buffering is achieved, thenoise is reduced at the same time, and a construction method of the multi-span simply-supported bridge expansion joint is economical, fast and easy to popularize.

The invention provides a locking bolt / nut. The locking bolt / nut comprises a bolt, a first nut and a second nut; the bolt comprises a fixed end and a screw rod; the screw rod is provided with a first thread and a second thread, and the rotating directions of the two threads are opposite; the screw rod is inserted in a connected piece, and is screwed in the first nut and the second nut in sequence to tightly bond the connected piece on the fixed end; the first nut is provided with an internal thread matched with the first thread; the second nut is provided with an internal thread matched with the second thread; and the nominal diameter of the first thread is larger than the nominal diameter of the second thread. The locking bolt / nut is simple in structure and convenient to operate; the step-shaped screw rod is provided with two nuts, with opposite rotating directions, for cooperation; inclined teeth are arranged at the connected ends of the two nuts; and the inclined teeth are engaged with each other, so that the bolt / nut is provided with a permanent self-locking structure, guarantees permanent, stable and firm bolt connection, and solves the problem of bolt looseness caused by alternate strain due to external disturbance factors of alternating load or equipment vibration.

The invention discloses a battery anti-loosening wiring device used for a new energy automobile. The device comprises a first connector, a second connector and a lead. The first connector is connectedwith a battery module through the lead, and the first connector and the second connector are electrically connected in an inserted mode or a plug-in mode. The first connector comprises a first plastic block, first interfaces and an induction column. The second connector comprises a second plastic block, second interfaces and an armature. The induction column is glued in the first plastic block, one end of the induction column is exposed out of the first plastic block, the first interfaces are arranged in a side surface of the first plastic block and are located on the same side as an end portion, exposed out of the first plastic block, of the induction column, the two first interfaces are connected with an anode and a cathode of the battery module through leads, and the leads spirally wind the induction column in the first plastic block. One side of the second plastic block is provided with a jack and the two second interfaces, the second interfaces are in butt joint with the first interfaces, the armature is embedded in the jack, the jack is in butt joint with the induction column, the lead is glued in the second plastic block, and the second interfaces are connected with the leads.

The invention relates to an elliptical hole machining device. A workpiece clamping device, a spindle box and a power head are arranged on a seat frame; the spindle box is arranged above a longitudinal feeding device; a hollow worm wheel spindle, a circumferential feeding worm wheel and a circumferential feeding worm spindle are arranged inside the box; a first eccentric axial through hole is formed on the hollow worm wheel spindle; a hollow shaft is arranged in the first eccentric axial through hole; the two ends of the hollow shaft are fixedly connected with pinions respectively; the pinions are meshed with internal gears which are fixedly connected at the two ends of the box; the gear ratio and the pitch diameter ratio of the internal gears and the pinions are both 2:1; second eccentric axial through holes are formed on the two pinions; a cutter spindle is arranged in the second eccentric axial through holes; one end of the cutter spindle is provided with a cutter; and the other end of the cutter spindle is connected with the power head through a telescopic universal coupling. The elliptical hole in the invention has a smooth formed surface, accurate dimension and high quality, and the elliptical hole machining device can meet batch machining of different elliptical holes with low machining cost.

The present invention discloses a stabilizing device used for fixing a detonation pressure sensor. The stabilizing device comprises a detonation pressure sensor stabilizer and a coaxial cable stabilizer, and the detonation pressure sensor stabilizer is a cylinder equipped with the large and small diameter stepped center holes matching an outer circle of a detonation pressure sensor body. The outer cylindrical surface of a circle body is equipped with the outer screw threads, and the end head is equipped with a concave edge bench. The large diameter center hole is equipped with the inner screw threads, and the outer cylindrical surface corresponding to the middle part of the large diameter center hole is symmetrically equipped with the installing holes communicated with the large diameter center hole. The coaxial cable stabilizer is a stepped cylinder equipped with an internal center hole and the external small, medium and large diameters, wherein the outer cylindrical surface of a small diameter cylinder is equipped with the outer screw threads, the end face is equipped with a counter bore communicated with the center hole. According to the present invention, the measurement data deviation caused by the instability of the sensor and a measurement error caused by the swinging or loosening of a coaxial cable are avoided effectively, thereby guaranteeing the accurate measurement of the detonation pressure sensor to a detonation wave.

The invention provides a lock nut assembly, and relates to the technical field of fasteners. The lock nut assembly comprises a nut body and a gasket which are sequentially arranged in the vertical direction; the gasket is movably sleeved with a lock loop; the bottom surface of the nut body is provided with a first protrusion and a second protrusion, the first protrusion and the second protrusion are each in a right triangle shape, one of right-angle sides of the first protrusion and one of right-angle sides of the second protrusion are both fixedly arranged on the bottom surface of the nut body, the other right-angle side of the first protrusion and the other right-angle side of the second protrusion are both perpendicular to the bottom surface of the nut body, and bevel edges of the firstprotrusion and the second protrusion are the same in orientation; the gasket is of an annular structure, and the top surface of the gasket is provided with a first groove and a second groove; one endof the first groove communicates with the inner circle of the gasket, one end of the second groove is flush with the outer circle wall of the gasket, and the first protrusion and the second protrusion correspond to the first groove and the second groove in position in the vertical direction. The lock nut assembly has the advantages that after tightening, the connection tightness is improved by increasing friction force, and loosening of the nut body can be prevented.

The invention relates to a looseness-preventing mechanism in reversion of a pump impeller, which is characterized by comprising the impeller, a cylinder pin, a shaft sleeve, an inner hexagon screw, an upper shaft sleeve, a main shaft, a plane and a coupling thread, wherein the impeller is screwed on the main shaft by the coupling thread; the impeller abuts against the shaft sleeve which abuts against the upper shaft sleeve, so that the axial movement of the impeller is limited; the impeller is connected with the shaft sleeve by the cylinder pin, and the relative movement of the impeller and the shaft sleeve in the circumferential direction is limited, so that the synchronous rotation of the impeller and the shaft sleeve is ensured; and the inner hexagon screw is screwed on the shaft sleeve and abuts against the plane on the main shaft to limit the relative movement the shaft sleeve and the main shaft in the circumferential direction, so that the synchronous rotation of the shaft sleeve and the main shaft is ensured. The looseness-preventing mechanism has the advantages that the taken measure is as follows: the plane is cut on the original main shaft and simple parts such as a column pin, the inner hexagon screw and the like are added, so that the looseness preventing action in reversion of the impeller can be effectively played. The method is very simple, convenient and reliable, and the cost is low.

The invention discloses an anti-electromagnetic-interference train wheel vibration measurement method based on axle box acceleration. In the method, a system composed of a supporting plate, a rubber sleeve, a wireless speed sensor, a wireless acceleration sensor, a wireless laser acceleration sensor, a signal receiver and a computer is provided. An end cover of a train wheel set is sleeved with the supporting plate, the sensors are fixed to the upper and lower ends of the supporting plate, the coefficient of wheel vibration in the train travelling process is measured through the sensors and transmitted to the receiver through a network module, and the relationship that the coefficient is varied along with train operating speed is finally obtained through the computer. Interferences which the wireless sensors are likely to suffer from are eliminated by combining software with hardware, vibration measurement data is subjected to trend correction through the wavelet trend correction method, and real-time monitoring is achieved in the train travelling process. The system is simple in structure, convenient to carry, simple to operate, convenient to disassemble, high in measurement precision, accurate in analysis and suitable for various passenger and goods trains.

The invention belongs to the field of deep sea work tools, and discloses a hydraulic tool for deep sea cutting. The tool comprises a cylinder, an end cap, a tool rest, a piston rod, a movable cuttingknife, a cutting pillar, a supercharger and a handle, and the left end of the cylinder is provided with the end cap and the right end of the cylinder is fixedly connected to the tool rest; the right end of the piston rod passes through the right end of the cylinder, and the right end of the piston rod is vertically provided with the movable cutting knife; the tool rest is horizontally provided with a guiding chute; the tool rest is also provided with the cutting pillar, in order to match with the movable chopping knife for cutting objects to be cut; the tool rest is also provided with a spacing bench; the supercharger is installed on the end cap; the handle is installed on the cylinder. A chopping type cutting form is used, in order to optimize component structures, realize miniature lightweighting design, and improve underwater operation performance to the largest extent.

The invention relates to a locking device for the hammer head of a crusher. The inventin aims to provide the locking device for the hammer head of the crusher to solve the problems of looseness and dropping off of the hammer head of the crusher, so that the requirements of continuously crushing to to-be-crushed objects with diffrent crushing grain grades are met. The locking device for the hammer head of the crusher comprises a fixing seat and a big bolt, after passing through the through hole on the fixing seat, the big bolt is used for fixing a cutter tooth on a cutter tooth base through threaded connection, the device further comprises a spring, a safe bearing plate and at least two small bolts, the through hole on the fixing seat is a stepped hole, the spring is sleeved on the big bolt, one end of the spring is in contact with the stepped surface of the stepped hole, the other end of the spring is in contact with the bolt head of the big bolt, a big bolt fastener hole is formed on the safe padding plate, the big bolt fastener hole is hexagonal, the safe bearing plate is fixedly mounted on the fixing seat through small bolts, and the bolt head of the big bolt is positioned inside the big bolt fastener hole.

The invention discloses a charging pile for a battery car. The charging pile comprises a charging pile body, an interaction control module is arranged in the charging pile body. The charging pile is provided with a plug wire, one end of the plug wire is connected with an anti-theft plug; a jack is arranged on the anti-theft plug, a jack cavity is formed in the anti-theft plug; sealing blocks are symmetrically hinged to the two sides in the jack cavity. The inserting piece is inserted into the jack cavity to push the sealing block to turn and be unfold; the sealing blocks on the two sides can be pushed to rotate and fit through the first elastic piece so as to seal the jack; meanwhile, electromagnets are symmetrically arranged on the two sides in the jack cavity for attracting and clampingthe inserting piece. A contact piece is fixed at the bottom end in the jack cavity and used for being communicated with the inserting piece for charging, authorization information is input to the interaction control module so as to conduct and trigger the electromagnets to be magnetically attracted, the contact piece is conducted at the same time so as to be communicated with the inserting piece for charging, and the electromagnets are triggered to be disconnected when the authorization information is input again and the authorization information input last time is judged to be matched with the adjacent authorization information through the interaction control module.

The invention relates to a method for improving fatigue strength of a bolt through combination of the bolt and a connecting piece material, which belongs to the technical field of machine parts. The method uses a connecting piece and the bolt which consists of a bolt head, a bolt cylindrical part, an incomplete threaded part, a thread tooth removing part and a complete threaded part, wherein if the hardness of a bolt material is Hb, the hardness Hn of the material of a nut of the connecting piece is equal to (0.4-0.9)Hb. The bolt and the nut are combined by selecting different materials and the hardness of the nut is less than that of the bolt so that the contact surface is enlarged to reduce the stress concentration in the process of matching, the capacity of threads of the bolt to bearing stress is strengthened, thus the bolt is not easy to be damaged, the connection is firmer, and the fatigue strength is improved.

The invention relates to a revolution conveying device and belongs to the technical field of fluid conveying devices. The revolution conveying device comprises a core shaft, slip ring members and rotation seals, the slip ring members are sleeved on the outer circumferential surface of a valve core, the rotation seals are located between the valve core and the slip ring members, conveying grooves are arranged between the valve core and the slip ring members and located between each two rotation seals, and connection holes which are communicated with the conveying grooves are opened on the slip ring members corresponding to the conveying grooves; and conveying channels are arranged in the core shaft, one ends of the conveying channels are connectedwith conveying channels to be connected, and the other ends of the conveying channels are communicated with the conveying grooves. Due to the conveying grooves, the conveying channels on the core shaft are communicated with the corresponding connection holes on the slip ring members in 360 degree directions. An external connection pipeline between a fixing mechanism and a revolution mechanism is omitted, phenomena of torsional damage and obstructed conveying of the connection pipeline in the process of rotation of the revolution mechanism are completely prevented, and advantages of system structure simplification and reliable connection are achieved.

The invention discloses an elastic gasket of an anti-loose screw combined structure. The elastic gasket comprises a ring body with a port, anti-slip ratchets are arranged on the bottom surface of thering body, the top surface of the ring body extends upwards to form an anti-loose ring, the anti-loose ring is tapered, so that an outer inclined surface is formed on the outer side surface of the anti-loose ring, a plurality of notches are uniformly distributed in the periphery of the top surface of the anti-loose ring, and the top surface of the anti-loose ring is enabled to form a plurality offirst one-way teeth by the plurality of notches . According to the anti-loose screw combined structure, the elastic gasket, screws and unts are simple in structure, the structure has the functions ofanti-theft, anti-loosening and the like, and solves a series of problems caused by the fact that the screws in existing mechanical equipment cannot ensure to be absolutely anti-loosened and cause loosening of the equipment during running; the structure is stable, the machining is convenient, the batch production is facilitated, the manufacturing cost is low, and the marketization can be conveniently realized; and the invention further discloses a screw assembly of the anti-loose screw combined structure and a nut assembly of the anti-loose screw combined structure.

The invention belongs to the technical field of nuclear power stations, and particularly relates to an anti-looseness bolt assembly for high-radioactivity equipment and an expanding type anti-looseness process. The anti-looseness bolt assembly is formed by assembling an anti-looseness bolt A and an anti-looseness cap, the anti-looseness cap rotates along with the anti-looseness bolt A when the anti-looseness bolt A rotates after assembling is carried out, the upper portion of the anti-looseness bolt A is a round boss gasket, the upper end of the round boss gasket is an anti-looseness bolt screwing head, the overall anti-looseness cap is cylindrical, and a positioning hole matched with the anti-looseness bolt screwing head is designed in the middle of the cylindrical bottom. The anti-looseness bolt assembly is used for repairing work after the anti-looseness bolt on the high-radioactivity equipment losses efficiency; and through matched use of related installation tools, underwater long-distance operation is achieved, and anti-looseness repairing work on the bolt on the high-radioactivity equipment at multiple positions is achieved.

The invention discloses a hanging mechanism and particularly relates to a pulley conveying and hanging mechanism. The pulley conveying and hanging mechanism comprises a U-shaped groove, wherein two groove walls of the U-shaped groove are provided with saw-shaped teeth; an insertion hole is formed in one of the groove walls, an arc-shaped ear plate is placed into the insertion hole and is in threaded connection with a stamped nail, and the length direction of the stamped nail of the arc-shaped ear plate is consistent with the direction of a connecting line between the two groove walls; the arc-shaped ear plate is rotationally connected to the other groove wall; a bar-shaped hole is formed in the arc-shaped ear plate, and a stud is hung in the bar-shaped hole of the arc-shaped ear plate and is hung at the bar-shaped hole through a ring body; and a locating cylinder is arranged on the other groove wall of the arc-shaped ear plate, the locating cylinder of the arc-shaped ear plate is located above the stud and is internally provided with an internal thread in screw thread fit with the stud. By using the pulley conveying and hanging mechanism, the technical defect of angle regulation inconvenience or location unstability of a pulley on a conveying line in the prior art is overcome; and the pulley conveying and hanging mechanism is capable of realizing angle control and stable location.

The invention provides an external wall insulation structure with an elastic structure, and relates to the technical field of external wall insulation. The external wall insulation structure comprisesa wall body, a group of preformed holes matched with fixed barrels are formed in the wall body, and a group of fixed barrels are arranged in the preformed holes; a group of reinforcing ribs are arranged on the inner sides of the fixed barrels, and the reinforcing ribs are connected with the inner walls of the fixed barrels; and an insulation air bag is installed on the wall body, a decoration layer is installed on the insulation air bag, and a group of anti-loosening mechanisms are installed on the decoration layer. The elastic effect of clamping rods is better through torsion springs arranged on the clamping rods, connecting blocks are dragged through steel wire ropes arranged between the clamping rods and the connecting blocks, the two clamping rods are dragged by the steel wire ropes to get close to the inner side, at the moment, connecting bolts can be directly taken down, the steel wire ropes can be conveniently hidden and protected through the arrangement of the connecting blocks, the effect of limiting the connecting bolts in the circumferential direction is achieved through planes arranged on the connecting bolts, and the clamping rods can transversely move to be connectedwith the fixed barrels.

The invention relates to equipment and method for controlling the accuracy of sticking of a wall tile and a caulked joint. The equipment comprises a chassis, an adjusting shaft, an adjusting pipe, a supporting rod piece and a fixing piece. The lower end of the adjusting shaft is perpendicularly and fixedly connected to the chassis, the adjusting pipe is arranged on the adjusting shaft in a sleeving mode and is in threaded connection with the adjusting shaft, the upper end of the adjusting pipe is fixedly connected with the fixing piece, the upper end of the supporting rod piece is rotatably mounted between the adjusting pipe and the fixing piece, and a first horizontal piece used for horizontally supporting a cushion ruler is formed at the lower end of the supporting rod piece. The methodutilizes the equipment to adjust the levelness of the cushion ruler, one column on one of the two sides of a wall face is firstly paved with wall tiles from bottom to top by being tightly attached tothe cushion ruler, then another column on the other one of the two sides of the wall face is paved with the wall tiles, one column tightly attached to the cushion ruler is paved, the uppermost columnis paved then, and finally the rest wall face is stuck sequentially from left to right and from top to bottom. By utilizing the adjustability of the equipment which cooperates with the cushion ruler,the sticking position can be fixed in advance by using the method, the difficulty that the traditional sticking levelness and the flatness of a wall tile are difficult to control is overcome, and thepurpose that the flatness of sticking of the wall tile is controlled is achieved.

The invention discloses a main shaft for a machining center machine, comprising a shaft core and a shaft seat, wherein the shaft core is combined together with the shaft seat through a 7014C bearing and a 7012C bearing; an outer ring of the 7014C bearing is pressed by using a front end cover and a first spacer bush through bolts on a ring flange; an inner ring of the 7014C bearing is fixed on the shaft core through a first locking nut and a second spacer bush; an outer ring of the 7012C bearing is not fixed; an inner ring of the 7012C bearing is fixed on the shaft core through a second locking nut, a first circular-arc toothed belt pulley and a dust resistant cover; an ejector rod is arranged in the shaft core; a four-valve jaw is arranged below the ejector rod; the ejector rod bears an upward action force of a disc spring through a nut and then transmits the upward action force to the four-valve jaw; the nut and a third locking nut are mutually fastened; the shaft core inputs a torque through the first circular-arc toothed belt pulley; and the first circular-arc toothed belt pulley and the second circular-arc toothed belt pulley are fixed on the shaft core and are positioned above the second locking nut. Compared with the prior art, the main shaft has a more reasonable structure.

The invention provides a multifunctional fastening part and a use method thereof, and belongs to the field of mechanical accessories. The problems that an existing fastening part is low in efficiencyduring construction, troublesome in use and single in function are solved. The multifunctional fastening part comprises a bolt and a nut, the bolt comprises a screw rod and a screw head, the wall of the screw rod is provided with a clamping groove, the inner wall of the top end of the nut is provided with a sleeve groove, a clamping sleeve in the sleeve groove is further included, a clamping blockis mounted on the inner wall of the clamping sleeve, a limiting groove is formed in the outer wall of the clamping sleeve, the position, close to the upper side groove wall, of the limiting groove isan anti-theft segment, the position, close to the lower side groove wall, of the limiting groove is a loosening-prevention segment, a rod groove is formed in the wall of the sleeve groove, an elasticrod is mounted in the rod groove, a reset spring is mounted between the outer end of the elastic rod and the bottom of the rod groove, and pushes the elastic rod, and a limiting block is formed on the inner end of the elastic rod. The fastening part can be adjusted according to needs, the anti-loosening or anti-theft effect is achieved, and the use is convenient and efficient.

The invention relates to an anti-loosening device for a balanced suspension thrust rod, and relates to the field of balanced suspension equipment structures. A first anti-loosening assembly on the anti-loosening device is used for being arranged at the end part of one end of a balanced suspension, and specifically comprises a first connecting part and second connecting parts arranged on the two sides of the first connecting part correspondingly. The first connecting part is used for being connected with a thrust rod; at least one first fastener is arranged on each second connecting part; two groups of second anti-loosening assemblies are used for respectively and sequentially penetrating through one side of the balanced suspension and the corresponding second connecting parts in order to make the second connecting parts connected and fixed to the balanced suspension; at least one second fastener detachably connected with the first fastener is arranged at the end, close to the corresponding second connecting part, of each second anti-loosening assembly; and the second anti-loosening assemblies are mainly used for limiting relative movement of the second anti-loosening assemblies andthe second connecting parts after the second anti-loosening assemblies and the second connecting parts are fixed. The anti-loosening device solves the problems that in the prior art, a bolt connecting structure is poor in anti-loosening effect, and meanwhile the thrust rod is difficult to install due to the structure of the bolt connecting structure.

The invention belongs to the technical field of high temperature gas cooled reactors, and particularly relates to a special-shaped locking gasket for a reactor core shell bearing ball cover plate of a high temperature gas cooled reactor. According to the technical scheme, the gasket is effectively prevented from sliding through bilateral anti-rotation of the gasket, the friction coefficient of a contact surface of the gasket and an upper cover plate is increased, shear force in the circumferential direction of the gasket is reduced when bolts are screwed down, and the cracking danger at the root of an anti-rotation stopping piece is prevented. Meanwhile, the lower special-shaped sheet end of the special-shaped ring locking gasket can be turned up easily, so that construction difficulty is lowered. Moreover, after the lower special-shaped sheet end of the special-shaped ring locking gasket is turned up, parts of bolt heads can be wrapped, the bolt heads can be locked after being tightly knocked with a copper bar, and accordingly the locking function can be achieved.

The invention provides a locking plate structure for a hospital cart. The locking plate structure comprises stand columns, a side plate, adjustment-free connecting rod locks, locking plate connecting parts, locking plates, locks, self-tapping screws, anti-theft screws and covers. The locking plate structure has the advantages that protruding blocks arranged at the two ends of the side plate are clamped in grooves formed in the stand columns, connection is performed through concave and convex occlusion, the side plate can be installed on the stand columns conveniently, two screw holes are formed in the locking plates and used for assembling the anti-theft screws and the locking plate connecting parts, the phenomenon that the connecting parts loosen is avoided, the tightness of connection between the locking plate connecting parts and the locking plates is improved, the self-tapping screws and the anti-theft screws are sleeved with bolt gaskets, the part surface can be prevented from being worn out, the looseness preventing effect can be achieved, the covers cover the anti-theft screws in the screw holes formed in the locking plates, the anti-theft screws are hidden under the covers, and the phenomenon that in the long-term use process, the anti-theft screws make contact with water stains to rust, and the overall appearance of the cart is affected is avoided.

One purpose of the invention is to provide a bolt locking device, so that a bolt can be locked in a narrow space. The other purpose of the invention is to provide an engine case which is provided with the bolt locking device. In order to achieve the purpose, the bolt locking device comprises a supporting unit and an anti-loosening unit. The supporting unit is provided with a unit body, the unit body is provided with a plurality of through holes which allow a screw portion of the bolt to pass through and are smaller than the outer diameter of a bolt head, a boss portion is arranged on the upper surface of the unit body in a protruding manner, and a limiting portion and a convex shoulder are formed on the boss portion. The anti-loosening unit is provided with a plurality of anti-loosening holes, each anti-loosening hole is in a shape matched with the peripheral contour of the bolt head, and an opening allowing the limiting part to penetrate through is formed in the anti-loosening unit, wherein the limiting part penetrates through the opening, so that the anti-loosening unit is supported on the convex shoulder, and the movement of the anti-loosening unit in the height direction is limited by bending the limiting part.