55results about How to "Avoid snipping" patented technology

The invention discloses a rotation angle measuring device and engineering machinery. The rotation angle measuring device comprises a substrate, a connection shaft, an elastic connection piece, a rotary encoder, a transmission shaft and an inner gear ring, wherein the rotary encoder is arranged on the substrate, and an input shaft of the rotary encoder is connected with the transmission shaft; the lower part of the transmission shaft is fixedly provided with an outer gear, and the outer gear is engaged with the inner gear ring on a chassis; the connection shaft is fixedly arranged on an upper car body, and the substrate is connected to the connection shaft in a swinging way; and a first end of the elastic connection piece is connected to the substrate, a second end is connected to the upper car body, and the substrate and the transmission shaft are pulled towards the outer part of the inner gear ring, so that the outer gear on the bottom of the transmission shaft is maintained engaged with the inner gear ring. Due to the adoption of the rotation angle measuring device, while the rotation angle of the upper car body is precisely measured, the flexibility in connection of the encoder and the chassis is realized, parts of the rotation angle measuring device can be prevented from suffering large radial force, and the connection piece between the rotary encoder and the upper car body can be effectively prevented from being cut off.

For sealing the gap, especially the air gap between two body parts (14, 15) of motor vehicles, a plastic profile in the form of a foam strip (10') with a fixing means (100) is proposed which has at least two legs (16, 18) which are hinged together, whereby a first leg (16) is joined to the foam strip (10') by means of a first adhesive layer and a second leg (18) is provided with a second adhesive layer for joining to a gap inner side (20). (FIG. 2B)

A cold-formed thin-walled steel-structure house outer wall structure system comprises beams and wall frame pillars, and the beams and the wall frame pillars are in cooperation with one another. The cold-formed thin-walled steel-structure house outer wall structure system is characterized in that the wall frame pillars comprise lower layer pillars (8) and upper layer pillars (18); the beams comprise floor beams (9), a top beam (11) and a bottom beam (17); the tops of the two adjacent lower layer pillars (8) are fixedly embedded in the top beam (11); pulling resistant pieces (13) are connected between the inner walls of the lower layer pillars (8) and the top beam (11), the floor beams (9) are fixed above the top beam (11), and the bottom beam (17) is fixed above the floor beams (9); the bottoms of the two adjacent upper layer pillars (18) are fixedly embedded in the bottom beam (17); pulling resistant pieces (13) are connected between the inner walls of the upper layer pillars (18) and the bottom beam (17); and a truss type strengthening part is installed between the top beam (11) and the bottom beam (17), and the truss type strengthening part is fixed to the top beam (11) and the bottom beam (17) through spacers (16) and nuts (19) after pulling resistant anchor bolts (14) penetrate through bolt holes (15), the top beam (11), steel sleeves (4) and the bottom beam (17).

The invention relates to a device and a method for transferring rod-shaped items for a tobacco industry from a storage bunker into a conveyor pipe. The device comprises a transmitter unit which consists of a rotatably-driven roller with recesses for receiving and transverse axially supplying of the rod-shaped articles from a storage bunker into an exhaust area. The roller and the exhaust area are connected with each other by a blocking shaft for transversely and axially supplying of the articles from the roller to the exhaust area. A conveying unit composed by the roller and the blocking shaft is arranged in a main chamber which is formed as pressure chamber. A pressure dividing chamber is disposed in front of the main chamber along a conveying direction (F) of the articles and is used for receiving and storing articles. The invention also relates to a relative method.

The invention provides a mechanical sand prevention method for a small sleeve producing well, a mechanical sand prevention tubular column and a fishing tool. The mechanical sand prevention method forthe small sleeve producing well, the mechanical sand prevention tubular column and the fishing tool can change the current situation that the current small sleeve producing well only uses chemical sand prevention and improve the sand prevention efficiency, and the down-hole tubular column is conveniently fished in later remedial work. A packer with a release function is connected to the mechanicalsand prevention tubular column, the packer is not provided with a cava supporting mechanism and a cava, the bottom of the mechanical sand prevention tubular column abuts against the sand surface of an artificial bottom of a well and a ball is threw into the packer to provide expanding force for pressing sealing, and the mechanical sand prevention tubular column can release through liquid pressingand mechanical back-off. The fishing tool comprise a fishing upper connector and a fishing barrel, an inner thread of the lower portion of the fishing upper connector is connected with a core shaft,and the upper portion of the fishing barrel is connected with the core shaft through a guide pin. According to the mechanical sand prevention method for the small sleeve producing well, the mechanicalsand prevention tubular column and the fishing tool, an effective tubular column for construction is provided for the mechanical sand prevention of the small sleeve well, the fishing tool is furtherprepared for the later remedial work, and the structure is simple and construction is convenient.

The invention belongs to portable multi-purpose pliers with an electricity testing device. A left pliers body and a right pliers body are hinged to each other through a rivet, and a plurality of arc-shaped cutting edges with different diameters are correspondingly arranged on the inner sides of a left blade and a right blade, so that the left blade and the right blade are engaged to form a wire stripping opening. Insulated handles are arranged on the lower parts of the left pliers body and the right pliers body in a sleeving mode separately, and the electricity testing device is arranged on one side of the interior of the corresponding insulated handle. The portable multi-purpose pliers with the electricity testing device is simple in structure, through the combination of electrical scissors, wire stripping pliers and wire pressing pliers, the portable multi-purpose pliers are convenient to carry, the occupied space is reduced, and the number of carried tools and wasted time in replacing tools are reduced effectively; and by arranging the electricity testing device inside the corresponding insulated handle, the safety of work of staff is ensured, the left blade and the right bladefor wire stripping are detachably installed on the left pliers body and the right pilers body to facilitate the replacement of the left blade and the right blade when the left blade and the right blade are worn, and the working efficiency is further improved.

The invention discloses an anchor cable base. The base includes a bottom plate and a support plate which are hinged to each other at one end; the bottom plate and the support plate form an acute anglewith each other; the bottom plate and the support plate are respectively provided with a through hole used for penetrating an anchor cable; one side of the bottom plate away from the support plate isprovided with a friction structure for increasing friction; and an angle adjusting device is disposed between the bottom plate and the support plate; and the angle adjusting device includes multipletooth form grooves respectively disposed on opposite sides of the bottom plate and the support plate, and further comprises an adjusting wedge with two ends respectively snapped to one of the tooth form grooves. The anchor cable base adjusts an angle between the bottom plate and the support plate by the angle adjusting device, an anchorage device is kept to be parallel to an opposite surface of the support plate, so that the force direction of the anchor cable is perpendicular to the support plate, and so, in a tensioning process, a shearing force is not generated on the anchor cable due to anincluded angle existing between the anchorage device and the anchor cable, the anchor cable is prevented from being cut due to extrusion, the accuracy of a tensioning force is ensured, and the anchorcable base is used in the field of soil protection.

The invention relates to the technical field of wind tunnels, and provides a wind tunnel damping net tensioning device and a wind tunnel stability segment. The wind tunnel damping net tensioning device comprises an installation mechanism, a tension mechanism and a clamping mechanism, wherein the installation mechanism comprises a bearing installation base and a joint bearing installed on the bearing installation base, the tension mechanism comprises a pull rod, the pull rod penetrates the joint bearing and the end of the pull rod is hinged with the clamping mechanism, the clamping mechanism isused for clamping the damping net. When the wind tunnel damping net tensioning device is arranged in periphery of the wind tunnel stable segment, tension degree of the wind tunnel damping net tensioning device can be regulated in a large range. Further, the wind tunnel damping net tensioning device comprises the joint bearing, the pull rod penetrates the joint bearing and the end of the pull rodis hinged with the clamping mechanism, so that the tension mechanism can drive the damping net to deflect in any direction, so as to effectively release temperature difference stress of the damping net under high and low temperature role and prevent the root of the damping net from being cut off by the clamping mechanism under repeated action of pneumatic load.

The invention discloses a large foot stool lock for a motorcycle, which structurally comprises a large foot stool (1), wherein a shaft (2) is arranged in a shaft sleeve (3) which is connected with the middle of the large foot stool (1). The large foot stool lock is characterized in that: a hole (9) is formed in the shaft sleeve (3), a pinhole (4) which is matched with the hole (9) is arranged on the shaft (2), a locating pin (5) and a spring (6) are arranged in the pinhole (4), one end of a steel wire (7) penetrates through the shaft sleeve (3), the shaft (2), the spring (6) and the pinhole (4) to be connected with the locating pin (5), and the other end of the steel wire (7) is connected with a switch (8). The shaft and the shaft sleeved are fixed through the pinhole and the locating pin in the shaft sleeve of the bracket, the locating pin is placed in the shaft sleeve of the bracket through pulling a steel wire open lock body which is connected with the switch, if the switch and the steel wire are forcedly broken, a sliding column falls into the sleeve, so the steel wire cannot be pulled, the shaft sleeve cannot be rotated, and further, the theftproof purpose is realized. The positions of the switch and the steel wire are hidden, and a remote control magnetic lock is used for controlling, so the operation is subtle.

A cassava stem clamp is a farm implement for clamping a cassava stem and consists of a clamping screw, a flexible member, a right hanging lug shaft, a right hanging lug seat, a right hanging lug, a right clamping pad seat, a right clamping pad, a clamp seat, a left clamping pad, a left hanging lug shaft, a left hanging lug and a left hanging lug base, wherein the left clamping pad and the right clamping pad are made of an elastic material, the clamping screw is loosened to put the cassava stem between the left clamping pad and the right clamping pad, then the clamping screw is turned, the cassava stem is clamped by the right clamping pad and the left clamping pad, the clamping screw is loosened, the right clamping pad breaks away from the cassava stem, the left hanging lug shaft can rotate I the left hanging lug seat, the right hanging lug shaft can rotate in the right hanging lug seat, and the flexible member is flexible and high in adapbility. The cassava stem clamp has the advantages of being large in clamping force and firm in clamping and preventing the cassava stem from being sheared off, the productivity can be effectively improved, and the cassava stem clamp can be used for cassava stems different in diameter and growth direction and can be used for pull-up type cassava harvesters including small hydraulic bionic cassava harvesters and the like.

The invention provides an integral window drilling tool. The integral window drilling tool comprises a window sidetrack drilling unit, a tile clamping anchoring unit and a friction direction changing unit connected in order from top to bottom. The integral window drilling tool adopts a mechanical seat sealing principle by rotating and pushing, and is simple in structure, simple in operation, reliable in performance, high in efficiency, and capable of completing the constructions of drilling tool downward entering, direction settling, seat sealing, window opening, window fixing and the like in one time drilling; axial direction compression resistance and circumferential torsion resistance are realized through a set of clamping tile, and the direction changing groove design of the mechanical anchoring mechanism can effectively prevent a mistake of seat sealing caused by lifting a drill stem excessively during the process of drilling down and up and increase the stability of tile clamping anchoring.

The invention belongs to the technical field of winding, and particularly relates to a winding mechanism and a winding method thereof. By the winding mechanism and the winding method thereof, the problem of unreasonable design of the prior art is solved. The winding mechanism comprises an installation plate, wherein a lifting plate is vertically arranged on an outer surface of the installation plate and is connected with a lifting driving device, at least one incoming line nozzle is arranged on the lifting plate, is vertically arranged and is connected with an incoming line lifting driving structure, winding clamping devices are arranged on the lifting plate and are in one-to-one correspondence to the incoming line nozzles, cutting devices are further arranged on the lifting plate and arein one-to-one correspondence to the winding clamping devices, the cutting devices are used for winding tail wires after being cut around second pins, and the incoming line nozzles, the winding clamping devices and the cutting devices are sequentially arranged. The winding mechanism has the advantages that the production efficiency and the winding quality are substantially improved.

The invention relates to an anti-theft storage device for a bicycle and a working method thereof and belongs to the field of machinery. The anti-theft storage device for the bicycle comprises a lifting assembly and a locking assembly; the lifting assembly comprises a base; two guide rails are vertically fixed on the base; the two guide rails are groove-shaped guide rails; a connecting plate is arranged between the two guide rails; and two track wheels are mounted on the two sides of the connecting plate. The anti-theft storage device for the bicycle has the advantages that a steel wire lock can be prevented from being cut off by using a bolt clipper, the bicycle parking floor space can be reduced, bicycles can be placed in an orderly manner, and the management is made convenient.

The invention discloses a segment lining structure adapting to large surrounding rock deformation. The structure comprises a foundation segment (1) and a retractable joint (6), the retractable joint (6) comprises an inner side end panel (2) and an outer side end panel (5), the inner side end panel (2) is fixedly connected with one side surface of the foundation segment (1), the retractable joint (6) is provided with a plurality of compressible layers, and the compressible layers are provided with deformable compression components (3). The invention further discloses a construction method of the structure. The segment lining structure adapting to large surrounding rock deformation comprises two parts, namely the foundation segment and the retractable joint, the retractable joint is providedwith the plurality of compressible layers, the compressible layers are provided with the deformable compression components, thus when surrounding rock generates large deformation, the retractable joint is subjected to an extrusion effect of adjacent segments at two sides, the compression components generate compression deformation, space is provided for surrounding rock deformation, surrounding rock stress is released, and the tunnel segment structure is prevented from being damaged.

The invention relates to the field of intelligent robots, in particular to an intelligent tomato lateral branch trimming robot based on visual inspection. The intelligent tomato lateral branch trimming robot comprises a first lateral moving frame, a second lateral moving frame, an adjusting mechanism, first visual inspection cameras, shear fork type lifting mechanisms, translation rotating mechanisms, multi-axis mechanical arms and a scissors elastic clamping head, wherein the top end of the lateral moving frame is fixedly connected with working ends on two sides of the adjusting mechanism; the first visual inspection cameras are arranged on two sides of the bottom end of the lateral moving frames; the shear fork type lifting mechanisms are arranged at the bottom ends of the first lateral moving frame and the second lateral moving frame, a damping frame is further arranged at the bottom end of each shear fork type lifting mechanism, and electric universal wheels are further arranged on the two sides of the bottom end of each damping frame; the translation rotating mechanisms are arranged at the bottom ends of the opposite sides of the first lateral moving frame and the second lateral moving frame; the mounting ends of the multi-axis mechanical arms are coaxially and fixedly connected with the rotating parts of the translation rotating mechanisms; and the scissors elastic clamping head is arranged on the rotating part of each multi-axis mechanical arm, and a second visual inspection camera is arranged at the working end of the scissors elastic clamping head. The robot can automatically trim tomato lateral branches and support the lateral branches away from trunks.

The invention discloses a thread trimming device for a zigzagger. A thread cutting electromagnet fixed plate is mounted in the middle of a thread cutting shaft, a thread cutting electromagnet is fixedly mounted in the thread cutting electromagnet fixed plate, a thread cutting electromagnet drive link is coaxially and fixedly mounted at one end of the thread cutting shaft penetrating the left sideof the thread cutting electromagnet fixed plate and connected with the end of the thread cutting electromagnet through nuts, a thread cutting rolling column is mounted in the middle of the thread cutting shaft and matched with a thread cutting cam, the left end of the thread cutting shaft is connected with one end of a thread cutting connecting rod through a thread cutting connecting rod shoulderscrew, the other end of the thread cutting connecting rod is connected with the lower end of a thread cutting transmission rod through a first clamping spring and a drive link eccentric pin, the middle of the thread cutting transmission rod is connected with a thread cutting support seat through a second clamping spring and a thread cutting transmission rod eccentric shaft, and a movable cutter ishorizontally arranged at the upper end of the thread cutting transmission rod and slidably assembled in the middle of a guide plate. According to the device, sewing efficiency can be improved, resources are saved, and operation and development of a factory are more facilitated.

The invention discloses a detaching-preventing watchband based on a Hall switch, and relates to an anti-disassembling watchband. The detaching-preventing watchband comprises a watchband main body, an FPC (flexible printed circuit), the Hall switch, screws, a magnet and a flat catch, wherein the FPC and the Hall switch are embedded in the watchband main body; a joint of the watchband main body is fixed by virtue of buckles; the small magnet is embedded in the buckle; the buckle is locked with the flat catch by virtue of the screws; and the FPC, the Hall switch and the magnet are mutually matched and are connected to electronic equipment. The detaching-preventing watchband provided by the invention is reasonable in structural design, beautiful in appearance, comfortable to wear and strong in practicability, and the watchband has functions of preventing detaching and shearing and giving an alarm timely.

The invention discloses a main hoisting mechanism of a metallurgy ladle crane. When the main hoisting mechanism is used, a first motor and a second motor are started, and the phase of the first motor and the phase of the second motor are adjusted through a phase adjustment device connected between the first motor and the second motor to enable the first motor and the second motor to synchronously rotate. The torque is transmitted by the output end of the first motor to the input end of a first speed reducer and transmitted by the output end of the first speed reducer to the input end of a first main hoisting drum, and meanwhile the torque is transmitted by the output end of the second motor to the input end of a second speed reducer and transmitted by the output end of the second speed reducer to the input end of a second main hoisting drum. The output end of the first main hoisting drum is connected with the output end of the second main hoisting drum through a first shaft coupler, synchronous rotation of the first main hoisting drum and the second main hoisting drum is achieved, rigid connection bolts of the first shaft coupler are prevented from being loosened and sheared, and a drum shaft is prevented from being cracked. The invention further provides the crane which comprises the main hoisting mechanism.

The invention discloses a scroll compressor, relating to the technical field of fluid machinery. The scroll compressor comprises a balancing component installed on a driving shaft, wherein the balancing component is provided with a shaft sleeve and a balancing weight installed outside the shaft sleeve, and at least part of the binding surface between the outer side of the shaft sleeve and the balancing weight is the plane for preventing the relative rotation between the shaft sleeve and the balancing weight. Compared with the prior art, the invention can solve the problem that low working reliability of the balancing component can damage the machine.

The invention discloses a drip irrigation belt laying machine. The drip irrigation belt laying machine comprises a machine frame, a traction frame is fixed at the front end of the machine frame, a contour wheel is rotatably arranged at the bottom of the machine frame, a drip irrigation belt roller is rotatably arranged on the machine frame, a drip irrigation belt conveying mechanism arranged belowthe drip irrigation belt roller is fixed on the machine frame, and a shearing mechanism fixed on the machine frame is arranged below the drip irrigation belt conveying mechanism. The drip irrigationbelt laying machine has the advantages that drip irrigation belts clamped between a driving belt and a driven belt are conveyed downwards under the mutual friction effect of the driving belt and the driven belt, when laying in one row is completed, the drip irrigation belts are cut off after a cutting edge of a movable piece abuts against a cutting edge of a fixed piece, laying of one row of dripirrigation belts is completed, and laying of a large number of drip irrigation belts can be achieved through the reciprocating action; the drip irrigation belts are actively conveyed downwards throughinteraction of the driving belt and the driven belt instead of being passively pulled and laid, so that the drip irrigation belts are prevented from being snapped; and the drip irrigation belts are cut off through the shearing mechanism, so that the labor intensity is reduced, and the operation efficiency is improved.

The invention relates to an improved Miller type expansion joint device and a mounting method thereof, and belongs to the technical field of expansion joint devices of bridges. The expansion joint device is divided into an upper part and a lower part, an elastic cushion is arranged between the upper part and the lower part, the lower part is connected with a beam body into a whole through poured concrete, and the upper part is connected with the lower part through a screw rod. When concrete is poured, a flow guide groove is adopted, a flow guide plate is arranged in the flow guide groove, fibers are oriented after the concrete passes through the flow guide groove, and the steel fibers tend to be perpendicular to the side face of the lower part after pouring. After the base plate straddles the expansion joint, an asphalt layer is paved on the whole road, the asphalt layer in the area corresponding to the upper part is cut off, and the upper part is installed. The height of the expansion joint device is convenient to adjust, so that the upper surface is as high as the upper surface of the asphalt layer, and the asphalt layer is convenient to lay in the future.

The invention provides a small-size cassava and pueraria thomsonii harvesting machine, and belongs to small-size agricultural machinery for harvesting cassava and pueraria thomsonii. The small-size cassava and pueraria thomsonii harvesting machine consists of a hydraulic jack, a big plunger rod, a small piston rod, a trolley frame, a main cross beam, a back cross beam, an upright post, an uprightpost middle cross beam, an ascending and descending frame, a chain wheel, a chain, a rolling wheel, a suspension arm, a flexible element, an operation rod, a fast stem clamp, wheels, support feet andthe like. The stems of the cassava or the pueraria thomsonii are tightly clamped by the fast stem clamp; and the operation rod is pressed down, so that the big plunger rod of the hydraulic jack, the chain wheel, the chain, the ascending and descending frame, the suspension arm, the flexible element and the fast stem clamp move to pull up the cassava and the pueraria thomsonii. The small-size cassava and pueraria thomsonii harvesting machine has the advantages of labor saving, low broken rate of the cassava and the pueraria thomsonii, high productivity, operation convenience, small size, lightweight, portability, firmness, high reliability, low cost, energy saving, environment protection and low use cost, can adapt to mountainous regions, small field parcels and big field parcels with uneven ground, and wet and muddy farmland having complicated terrains and interplanted and intercropped with other crops, can be used for harvesting other plants and crops, and has very wide purposes.

The invention discloses a device for fixing a vehicle. The device for fixing the vehicle comprises an annular lock beam, wherein the head and the tail of the lock beam are connected so as to form a connector; and a protective sleeve is fixed outside the connector of the lock beam to shield the connector. The lock beam and the protective sleeve are made of high-quality high-hardness steel; and the protective sleeve ensures that the connector of the lock beam is not exposed, so that a thief can be prevented from cutting the lock beam or damaging the lock beam through the thin connector of the lock beam. The lock beam is fixed on a fixed steel pipe of a park. During parking, a lock for locking the vehicle is locked on the lock beam, so that the aim of preventing the condition that the thief conveys the vehicle by damaging the lock beam can be fulfilled.

The invention provides a multi-position anchor cable construction device, and belongs to the technical field of anchor cable construction. Comprising two symmetrical T-shaped supports, a connecting plate is welded between the two T-shaped supports, sliding grooves are formed in the T-shaped supports, a height adjusting assembly is installed on the connecting plate, a supporting plate is fixedly installed on the height adjusting assembly, sliding blocks are installed on the two sides of the supporting plate in a sliding mode, and a hinge assembly is installed on the supporting plate. A bottom bracket is fixedly installed on the hinge assembly, a walking frame is installed on the bottom bracket in a sliding mode, an anchor cable machine is installed on the walking frame, the structure is simple, installation and use are convenient, the angle of an anchor cable can be rotated according to needs, the problems of construction shoulder nests of the anchor cable machine and the angle of an anchor cable on the upper portion are solved, the effective vertical anchoring depth of the anchor cable is increased, and the construction efficiency is improved. The anchor cable is prevented from being cut off, the accident that the anchor cable base plate falls off and hurts people is eradicated, top plate accidents are greatly reduced, and safety benefits are good.

The invention provides a prying-resistant and shearing-resistant padlock which is provided with a housing, a lock cylinder, a latch hook and a bottom plate, wherein an insertion hole is formed in oneside of the housing, an accommodation chamber is arranged on the other side of the housing, the accommodation chamber is provided with a lock cylinder groove, a lock catch groove, a front latch hook channel and a joining part. The lock cylinder is arranged in the lock cylinder of the housing, a lock hole is formed in front of the lock cylinder, and a convex shaft is arranged behind the lock cylinder; the latch hook is arranged in the front latch hook channel of the housing, and a shaft hole is formed in the latch hook; the bottom plate is arranged in the accommodation chamber of the housing, amovable space, a back latch hook channel and an abutting part are arranged on one side of the bottom plate, and a latch hook port is formed in one end of the bottom plate. Thus, the latch hook port of the bottom plate and the lock catch groove of the housing a hung to a locked assembly and the lock cylinder drives the latch hook to lock the locked assembly to hide the latch hook by means of the housing, so that prying and shearing are prevented.

The invention belongs to the technical field of epoxy pouring dry-type power transformers, in particular to a high-voltage coil air passage placing structure which comprises a high-voltage coil and anair passage. The front surface of the high-voltage coil is provided with the through air passage, an air passage square pipe is installed in the air passage and is fixedly connected with the high-voltage coil, and an I-shaped supporting strip is installed at the side, close to the air passage square pipe, of the air passage. The wire is wound into the air passage, an internal insulator is placed,then an air passage square tube is placed in the air passage, and then another I-shaped supporting strip is placed, and the thickness of the I-shaped supporting strip is matched with that of the airpassage, so that the I-shaped supporting strip can be stably fixed in the air passage, the conection of the I-shaped supporting strips and the high-voltage coil are stable, and the air channel squaretubes are convenient to plug and pull. By continuously winding at the third section and the fourth section, and adopting the mode that one air channel square tube is arranged between every two I-shaped supporting strips, wires are prevented from being cut off and welded, the winding time of the coil is shortened, and the product quality is improved.

The invention relates to a device for strengthening and improving the anti-theft performance of a U-shaped lock. According to the technical scheme, the device has the purposes that 1, in order to prevent a U-shaped lock rod from being cut off, a steel pipe of 32 mm sleeves the lock rod with the diameter being 13 mm of the U-shaped lock, and a thick protective suit is worn on the lock rod to prevent the lock rod from being cut off; 2, small U-shaped gaps are formed in the two ends of the steel pipe correspondingly, the two ends of a lock body can right be arranged in the gaps to be protected against being smashed, the two ends of the lock body and the lock rod are not prone to being directly hit and taken off by destructive violence, but the two ends of traditional U-shaped lock bodies areprone to being smashed; and 3, after parts 1, 2, 3 and 4 are combined, the small space distance can be formed between a lock cylinder of a lock hole and the part 2, the difficulty of stable control ofhands to 'a pin' when the pin controlling locking tools needs to lean against the edge of the lock hole for prying off during technical unlocking is increased, if all security doors are provided withlock protection devices, the difficulty of suspended prying off is much larger, and when the device is used with a class C lock cylinder or a blade lock cylinder, the protection action is better.