30results about How to "Avoid severe deformation" patented technology

The utility model provides an anti-vibration hammer. The damper comprises: a wire clamp structure; the wire twisting structure is connected to the wire clamping structure; the two hammer head structures are connected to the two ends of the stranded wire structure respectively, the connecting position of the stranded wire structure and the wire clamp structure is located between the two hammer head structures, the hammer head structures are made of aluminum alloy materials, each hammer head structure comprises a hammer head body connected with the stranded wire structure and two hemispherical hammer heads connected with the hammer head body, and the two hemispherical hammer heads are connected with the two hemispherical hammer heads. The two semispherical hammer heads are respectively positioned on two opposite sides of the wire stranding structure, and the curvature radius of each semispherical hammer head is greater than 50mm. According to the technical scheme provided by the utility model, the problem that corona is easy to occur when the vibration damper in the prior art is used in a high-altitude area of more than 4000 m is solved.

The composite corrugated board comprises surface paper layers and an inner paper layer, the surface paper layers are located on the two sides of the inner paper layer respectively, supplement blocks are evenly arranged between the surface paper layers and the inner paper layer, supporting blocks are arranged on the two sides of each supplement block, and a limiting piece is arranged on the lower portion of each supplement block in a sleeved mode. Each limiting piece comprises a connecting piece and a V-shaped plate which are connected with each other, and a connecting arm penetrating through the inner paper layer is connected between every two adjacent limiting pieces. By arranging the surface paper layer, the inner paper layer, the supporting block, the supplement block and the limiting piece, the paperboard is of a double-layer structure, has the capacity of bearing pressure on the two sides at the same time, can effectively prevent the paperboard from being seriously deformed, improves the strength of the paperboard, is beneficial to practical application, can limit the supplement block by combining with the limiting piece, does not affect gap filling after the supplement block is deformed, and improves the production efficiency. And the connecting arm is arranged to serve as a transition structure, the surface paper layer and the inner paper layer are effectively connected, and the structural stability is further improved.

The utility model provides a vehicle body front structure and a vehicle, and belongs to the technical field of vehicles, the vehicle body front structure comprises a cabin longitudinal beam, an A column, a force transmission structure and a floor longitudinal beam; the column A is positioned on the outer rear part of the cabin longitudinal beam; the force transmission structure is connected between the cabin longitudinal beam and the A column; and the front end of the floor longitudinal beam is connected with the cabin longitudinal beam and / or the force transmission structure. The engine room longitudinal beam is connected with the A column through the force transmission structure, the engine room longitudinal beam is further connected with the floor longitudinal beam, the force transmission structure serves as a main force transmission path, when a vehicle is in head-on collision, collision force borne by the engine room longitudinal beam is transmitted outwards and upwards to the A column through the force transmission structure, and serious deformation of a vehicle body is avoided. And the collision force transmitted from the cabin longitudinal beam to the floor longitudinal beam can be reduced, the non-deformability of the floor longitudinal beam is improved, and unstable rotation of the floor longitudinal beam is avoided.

The utility model discloses an inner inclined core-pulling structure for an automobile rear doorsill injection mold, which comprises a fixed block fixed on a movable mold, a sliding block I attached to the front side of the upper end surface of the fixed block, a sliding block III attached to the rear side of the upper end surface of the fixed block, a sliding block IV attached to the rear side surface of the fixed block, and a sliding block II attached to the lower side surface of the fixed block, an inclined guide column fixedly arranged on the fixed die is movably connected into an inclined guide hole in the front end of a first sliding block in a penetrating mode, the rear end of the first sliding block is in sliding fit with the front end of a third sliding block in the longitudinal direction through a first sliding assembly, and the lower side face of the first sliding block is in clamping fit with the upper side face of a second sliding block through a limiting assembly. The lower end of the fourth sliding block and the rear end of the second sliding block are in sliding fit in the longitudinal direction through a second sliding assembly, and the rear end of the fixing block, the rear end of the third sliding block and the upper end of the fourth sliding block are spliced and combined together to form a mold core block with a doghouse cavity. The problem that the doghouse and the rear doorsill body are inconsistent in demolding direction is solved, and the automobile rear doorsill is effectively prevented from being violently deformed or damaged in the demolding process.

The invention discloses an underground coal transport vehicle, and belongs to the technical field of coal transport devices, the underground coal transport vehicle comprises a vehicle frame main body and a vehicle head suspension plate, the outer side of the top end of the vehicle head suspension plate is provided with a guardrail assembly, and the top end of the vehicle head suspension plate is provided with a cockpit side protection assembly; a storage assembly and an anti-seismic supporting assembly are arranged at the position, located in the cab side protection assembly, of the top of the vehicle head suspension plate, and a throwing hole is formed in the top of the vehicle head suspension plate. Through cooperative arrangement of the trigger trapezoidal columns and the limiting clamping tongues, when the cockpit top plate is impacted by collapse objects, serious deformation of the cockpit top plate can be prevented through the anti-seismic buffer springs, meanwhile, resonance caused by impact of the collapse objects is weakened, and when the collapse objects cause deformation of the cockpit top plate, the limiting clamping tongues can be pressed downwards through the trigger trapezoidal columns, so that the collapse objects are prevented from collapsing. The seat bearing platform is put into the escape bin formed in the platform enclosure, and a driver can obtain escape materials in the material storage cabinet by opening the cabinet body closing plate and escape in time by opening the escape protection plate.

The application provides a profile conductor, a preparation method and a cable. The preparation method comprises a profile wire drawing process, an online annealing process and a layered twisting and light compression process. In the drawing process, a round die pre-drawing section, a T-shaped die pre-forming section and a finishing forming section are sequentially arranged. Through at least three round dies, the diameter is gradually reduced. Through at least two T-shaped transition dies, the circular cross section is smoothly transitioned to a trapezoidal profile. Then, the target shape is obtained by the finishing forming die, so that uneven deformation and misuse of the die are avoided. In the annealing process, the annealing voltage is dynamically set according to the cumulative area reduction rate, so that the recrystallization degree of the profile wire with different cross-sectional areas remains consistent. In the twisting process, after each layer is twisted, the tight compression die is radially compressed, and the adjacent layers are reversely twisted, so that the interlayer synergy is improved. The application effectively improves the conductor quality and production efficiency, and has the advantages of simple operation, low cost and easy popularization and implementation.

The invention discloses a dynamic wear process simulation prediction method and device for inter-structure long-period large wear loss and a storage medium, and relates to the technical field of nuclear reactor fretting wear. The method comprises the following steps: constructing a finite element model among a plurality of to-be-analyzed components based on initial morphology parameters of the plurality of to-be-analyzed components; according to a grid reconstruction condition, based on the finite element model and the wear model, executing a preset operation in a segmented manner to obtain a wear depth set and a morphology parameter of each segment; determining wear process distribution based on the wear depth set and the morphology parameter of each segment; the preset operation comprises the following steps: detecting that a grid reconstruction condition is met; and stopping calling the finite element model and the wear model of the current time period, determining a wear depth set and morphology parameters of the current time period, updating the morphology parameters of the finite element model, calling the updated finite element model and wear model, and determining a wear depth set and morphology parameters of the next time period.

A battery device (1) for supplying energy to the traction drive of a vehicle that is at least partially electrically operated includes a module device (2) having a battery module (12) for receiving a battery cell (42) and two longitudinal members (3) therebetween, and a transverse member device (4) connecting the longitudinal members (3) to each other. The transverse member device (4) is provided by a housing body (5) for housing a battery control electronics unit (10) and two console bodies (6), the housing body (5) being integrated between the two console bodies in a supportive manner. The transverse member device (4) includes a support geometry (7) for supporting the transverse member device (4) on the module device (2) in a defined manner such that, in the event of a collision, the transverse member device (4) at least partially absorbs the accident-related force effects and selectively transmits them to the module device (2) through the support geometry (7).

The utility model relates to the technical field of mining vehicles, in particular to an impact-resistant mine car cab which comprises a cab body, a windshield is fixedly connected to the side wall of the cab body, and pedal openings are formed in the opposite side walls of the cab body. According to the mine car cab, the top cover plate made of boron steel is arranged at the top of the mine car cab, so that impact destructive force caused by rockfall can be reduced, serious deformation of the cab is prevented, a driver is prevented from being threatened by life, the top cover plate can be lifted during installation, four inserting columns at the bottom of the top cover plate can be inserted into the installation columns, and the safety of the mine car cab is improved. And then the locking rod is rotated to lock the inserting column and the mounting column, the mounting speed of the top cover plate is increased, the vibration influence caused by small rockfall can be reduced through the arrangement of the sliding rod and the buffer spring, a cab cannot be shaken, and the driving safety of a driver is protected.

The invention provides a forming machine which comprises a tire body drum assembly, a turn-up drum assembly, a transfer assembly, a belt layer drum assembly and a shaping and winding assembly, and the turn-up drum assembly is located on the downstream of the tire body drum assembly; the end, away from the tire body drum assembly, of the turn-up drum assembly is connected with the end, in the length direction, of the transfer assembly. The belted layer drum assembly and the shaping and winding assembly are located on the two sides of the conveying assembly in the length direction correspondingly, and the shaping and winding assembly is close to or away from the tire body drum assembly relative to the belted layer drum assembly and comprises a winding structure and two shaping structures arranged at an interval. And at least one part of the winding structure can move between the two shaping structures. The problem that in the prior art, a forming machine is poor in use performance is solved.

The utility model discloses an A-level highway guardrail obstruction block structure which comprises an obstruction block body, assembly holes are formed in the upper side and the lower side of the rear end face of the obstruction block body, fastening bolts A penetrate through the assembly holes, key grooves are formed in the upper side and the lower side of the front end face of the obstruction block body, and fastening bolts B penetrate through the key grooves. A fixing rod is welded to the front side wall of an inner cavity of the blocking block body, a fixing block is connected to the rear end of the fixing rod, a guide groove is formed in the rear end of the fixing block, a cushion block is slidably connected into the guide groove, a buffer spring is connected between the cushion block and the inner wall of the guide groove, and a fixing base is connected between the cushion block and the rear side wall of the inner cavity of the blocking block body. Positioning holes are formed in the upper and lower ends of the fixed seat; the anti-blocking block is reasonable in structural design and convenient and fast to install, buffering protection can be conducted when the anti-blocking block body deforms, severe deformation of the anti-blocking block body is avoided, steel consumption is reduced, steel is free of galvanization, environmental pollution is avoided, and the anti-blocking block has high market popularization value.

The utility model discloses a spliced combination type P-shaped house beam belongs to the technical field of fabricated building. A spliced combination type P-shaped house beam, including two cross beams and two longitudinal beams, two cross beams and two longitudinal beams form a square frame, the cross beam and longitudinal beam are all P-shaped steel pipes, the cross beam includes two P-shaped steel pipes and the connecting rod for connecting two P-shaped steel pipes, the connecting rod is inserted in two P-shaped steel pipes inside, the utility model discloses a cross beam and longitudinal beam are set up to form a square frame, and the outer plate of support tool house, because the cross beam is longer, and the packing and transportation cost are higher, therefore, the cross beam is divided into two P-shaped steel pipes, reduces the length of cross beam, and the packing box transportation is convenient, the connecting rod is set up, and the connecting rod is inserted in the inner wall of two P-shaped steel pipes to improve the strength after the connection of two P-shaped steel pipes, avoids the intensity deficiency caused after the cross beam is divided.

The present application relates to the field of building technology, and in particular to an assembled light steel composite wall panel, including a wall panel, an outer steel pipe and a steel plate, etc.; a plurality of outer steel pipes are fixedly connected inside the wall panel, and all the outer steel pipes are arranged in a rectangular array; a steel plate is fixedly connected to the front of each outer steel pipe; each steel plate is fixedly connected to the wall panel, and the front side of each steel plate is flush with the wall panel. The present invention can directly heat the internal fireproof sand through a heat conducting plate, avoiding heating the fireproof sand only by the inner wall of the inner steel pipe, resulting in the fireproof sand in the middle of the inner steel pipe being heated slowly, and the time for the microspheres in the middle to expand due to heat lags behind the microspheres close to the inner wall of the inner steel pipe, resulting in a prolonged response time of the entire system, affecting the fire extinguishing efficiency.

The present invention relates to the field of bridge tunnel open hole engineering, and specifically discloses a wind-resistant open hole for bridge tunnels, including an inner frame, an outer frame and a wind-resistant tarpaulin; the inner frame includes two lateral frames and a first telescopic frame, the lateral frame includes several sections of first steel bars, the first steel bars are rotatably connected and can be automatically reset, the lower part of the lateral frame is vertical, the middle part is bent, and the upper part is horizontal, the upper parts of the two lateral frames are respectively telescopically arranged at the two ends of the first telescopic frame, several inner frames are arranged in a row and the wind-resistant tarpaulin is fixedly arranged on the outside of the inner frame; the outer frame includes two fixed frames and a second telescopic frame, the shape of the fixed frames is similar to that of the lateral frames, the upper ends of the two fixed frames are respectively telescopically arranged at the two ends of the second telescopic frame, and the tops of several outer frames are detachably provided with top plates. The purpose of the present invention is to solve the technical problem of how to prevent the influence of crosswind on vehicles.

The utility model discloses a simple elastic elasticated band tensioner relates to the technical field of elasticated band tension, including opposite moving assembly and left and right symmetry connection on the opposite moving assembly two moving plate, two the top symmetry of moving plate is connected with two for the pressure assembly of the both ends of elasticated band pressure in the top of two moving plate, opposite moving assembly is used for driving two moving plate with same speed to move to the direction of approaching each other or moving away, the pressure assembly includes the elastic lifting mechanism of connection in the top of moving plate, be connected with the clamping plate on the elastic lifting mechanism. Through setting up the pressure assembly, make staff only need to go up and down straight line movement quick drive mechanism can cooperate transmission mechanism drive clamping plate to rise and release elasticated band or drop and press the elasticated band, thereby conveniently and quickly complete the clamping operation to the elasticated band end, effectively improved the convenience and practicality of the device.

The utility model discloses a profile punching mechanism which comprises a blanking seat, a punching assembly, a Z-axis clamping assembly, a Y-axis clamping assembly and a Y-axis limiting assembly opposite to the punching assembly. The punching assembly is in transmission connection with the movable end of the Y-axis clamping assembly and can move in the Y-axis direction. The blanking base, the Y-axis limiting assembly, the Z-axis clamping assembly and the Y-axis clamping assembly define a punching cavity used for clamping a profile to be punched. The punching direction of the punching assembly and the blanking direction of the waste are both parallel to the Y axis. In the aspect of section bar clamping, section bar clamping work can be completed only through the movable Z-axis clamping assembly, the movable Y-axis clamping assembly, the static X-axis limiting assembly and the static Y-axis limiting assembly, and compared with an existing punching mechanism, under the condition that the number of movable clamping devices is reduced, the clamping stability of section bars can still be guaranteed, and the clamping efficiency of the section bars is improved. And meanwhile, the problem that the sectional material is seriously deformed in the clamping process due to multi-point stress can be avoided.

A dislocation guide mechanism for V-type disk stretching includes a disk body, a guide device and a roller device are arranged on one side of the disk body, the guide device includes a base, a guide plate, a vertical roller, and a transverse roller, the guide plate, the vertical roller, and the transverse roller are all installed on the base, a pipe groove is opened on the guide plate, the vertical roller is located on one side of the extension line of the pipe groove, the axis of the transverse roller is perpendicular to the extension direction of the pipe groove and the transverse roller is located on the upper part of the guide plate in the vertical direction, the roller device includes a first roller and a second roller, the first roller and the second roller have a pipe support part, the transverse roller, the first roller, and the second roller are arranged in sequence along the extension direction of the pipe, the pipe support part of the first roller is higher than the outer wall surface of the transverse roller in the vertical direction, and the pipe support part of the second roller is higher than the pipe support part of the first roller in the vertical direction. The present invention can make the input end and the output end of the pipe on the V-type disk staggered by a certain angle to avoid interference during the working process.

The utility model provides a slurry pipeline compensation device which is communicated with a slurry pipeline in a shield tunneling machine, the slurry pipeline compensation device comprises a flexible pipe section and a telescopic pipe section which are connected, and the telescopic pipe section is provided with a first rigid pipe and a second rigid pipe which are connected together in a sleeved mode. And a compensation mechanism for driving the first rigid pipe and the second rigid pipe to be close to each other or separated from each other is connected between the first rigid pipe and the second rigid pipe. According to the utility model, the expansion compensation amount of the slurry pipeline can be improved, so that the slurry pipeline is prevented from being damaged in a small-bending-radius turning process or a hinging oil cylinder expansion process.

The invention discloses a rotary kiln composite liner for Bi-series superconducting powder, the composite liner comprises a cylindrical main body, the cylindrical main body comprises an inner barrier silver liner and an outer support stainless steel liner from inside to outside in sequence, the barrier silver liner is further provided with a plurality of triangular support silver shifting plates which are uniformly distributed, and the triangular support silver shifting plates are connected with the inner barrier silver liner and the outer support stainless steel liner. The two ends of the cylindrical body are each provided with a conical barrel with an opening. According to the invention, the inner-layer barrier silver liner does not react with the Bi-series superconducting powder when the Bi-series superconducting powder is heated, contact with other materials is avoided, adverse effects on the Bi-series superconducting powder in the sintering process are avoided, and the outer-layer support stainless steel liner is arranged outside the inner-layer barrier silver liner to support the inner-layer barrier silver liner, so that the reliability of the Bi-series superconducting powder is improved. The problem that the inner container is clamped in a rotary kiln and cannot be taken out due to deformation of the inner-layer blocking silver container in the high-temperature sintering process is solved, meanwhile, the structural strength of the composite inner container is improved, long-time sintering of high-purity Bi-series superconducting powder is achieved, and the service life of the composite inner container is prolonged.

The utility model provides a kind of substrate rack, including support frame and protection component, support frame has opposite front and back, and at least one substrate placement area through front and back, wherein the front of support frame and the plating film surface of substrate are oriented same;Protection component is at least set on the front of support frame, for preventing heat directly radiates to support frame during plating film process, and preventing film layer directly covers on support frame;The utility model adds protection component on support frame, the protection component can effectively block radiation heat, prevent support frame from serious deformation due to temperature is too high, to avoid affecting normal use of substrate rack or leading to its damage.In addition, the protection component can also prevent film layer from covering support frame in large quantities, to extend the cleaning maintenance cycle and service life of substrate rack.

The present invention provides a device for leak detection in oil and gas pipelines, belonging to the technical field of pipeline detection equipment. The present invention includes a device body, a driving device is provided on the lower side of the device body, a piston chamber is provided in the device body, through holes 2 and 1 are provided at the left and right ends of the piston chamber respectively, pistons 1 and 2 are slidably arranged in the piston chamber, through holes 3 are provided on piston 1, through holes 4 are provided on piston 2, the piston chamber is filled with magnetorheological fluid, an electromagnet is provided on the lower side of the device body, a tension spring is provided between piston 1 and piston 2, a piston rod 1 is fixedly connected to the side of piston 1 away from piston 2, a limiting mechanism 1 capable of inhibiting the device body from tilting toward the side of piston rod 1 is provided on piston rod 1, a piston rod 2 is fixedly connected to the side of piston 2 away from piston 1, and a limiting mechanism 2 capable of inhibiting the device body from tilting toward the side of piston rod 2 is provided on piston rod 2. The present invention can check whether there is a leakage problem in the oil and gas transmission pipeline, which is simple and efficient.

The embodiment of the utility model provides a photovoltaic assembly and a photovoltaic system, the photovoltaic assembly comprises a first substrate, a photovoltaic cell, a packaging layer, a protection layer and a second substrate, one of the lower surface of the first substrate and the upper surface of the second substrate is provided with an annular projection along the periphery, and the lower surface of the first substrate and the upper surface of the second substrate are oppositely arranged; the photovoltaic cell and the packaging layer are arranged between the first substrate and the second substrate and are arranged in an area surrounded by the annular bulge, and the packaging layer is used for fixing the photovoltaic cell; and the protection layer is arranged between the first substrate and the second substrate, is arranged outside an area surrounded by the annular bulge, is arranged around the annular bulge, and is used for protecting the photovoltaic cell and the packaging layer. According to the technical scheme, the technical problem that an existing photovoltaic assembly is imperfect in structure is solved.

The utility model discloses a suspension type hydro-generator arc-shaped key dismounting device which comprises a main shaft, an umbrella-shaped stress frame body, a thrust block and a clamping ring are arranged on the outer surface of the main shaft, the clamping ring is located on the upper surface of the thrust block, and a swing vibration type separator and a clamping mechanism are arranged on the umbrella-shaped stress frame body. The umbrella-shaped stress frame body is divided into an upper layer and a lower layer, a plurality of arc-shaped grooves and round grooves are formed in the lower surface of the upper layer and the upper surface of the lower layer, the swing vibration type separators are movably connected into the arc-shaped grooves, and a plurality of supporting columns are further arranged between the upper layer and the lower layer. The upper portion and the lower portion of the supporting column are fixedly installed in the circular groove, a square hole is formed in the supporting column, a clamping mechanism is arranged in the square hole, and a plurality of partition plates are arranged on the thrust block. By means of the structure, the problems of potential safety hazards, inaccurate striking positions, ring key deformation and scrapping, equipment damage, high noise and the like existing in a traditional dismounting method are solved.

The invention provides a curtain wall wind-resistant structure. The curtain wall wind-resistant structure comprises a plurality of frame units, pin shaft supports, sliding supports and fixed supports. The plurality of frame units comprise a top frame unit, at least one middle frame unit and a bottom frame unit; the top end of the top frame unit is connected to a roof steel structure through a pin shaft support, and the bottom end of the top frame unit is connected to a preset beam body through a sliding support. The middle frame units are sequentially arranged under the top frame units, the top end of each middle frame unit is connected to a preset beam body corresponding to the top end of the middle frame unit through a fixed support, and the bottom end of each middle frame unit is connected to a preset beam body corresponding to the bottom end of the middle frame unit through a sliding support; the bottom frame unit is arranged under the middle frame unit, the top end of the bottom frame unit is connected to the corresponding preset beam body through a fixed support, and the bottom end of the bottom frame unit is connected to the ground through a sliding support. According to the invention, the non-interval design of the building cornice and the vertical curtain wall can be realized.

The utility model discloses an anti-static stainless steel wire mesh convenient to install, and relates to the field of stainless steel wire meshes, the anti-static stainless steel wire mesh comprises a wire mesh main body, two groups of first side rods and two groups of second side rods, corner blocks are arranged at the corner positions of the wire mesh main body, and the two sides of the four groups of corner blocks are fixedly connected with connecting plates; connecting grooves are formed in the two ends of the two first side rods and the two second side rods correspondingly, rotating baffles are arranged on the portions, close to the two ends, of the upper sides and the lower sides of the two first side rods and the two second side rods correspondingly, the two first side rods and the two second side rods are located on the periphery of the silk screen body correspondingly, and the two first side rods and the two second side rods are arranged in a staggered mode. The connecting plate is positioned on the inner side of the connecting groove; the stainless steel screen frame has the advantages that the stainless steel screen and the screen frame are combined and installed, welding is not needed, installation operation is convenient, installation efficiency is improved, the stainless steel screen can be prevented from being seriously deformed when being impacted by the outside, and the strength of the stainless steel screen can be improved.

The invention relates to the technical field of aluminum alloy machining, in particular to high-corrosion-resistance colorful aluminum alloy decorating part forming machining equipment which comprises a conveying system, an aluminum alloy plate and a mold used in cooperation with the aluminum alloy plate, and further comprises four clamping plates, a first clamping plate, a second clamping plate, a third clamping plate and a fourth clamping plate, according to the high-corrosion-resistance colorful aluminum alloy decorating part forming machining equipment, the two sets of clamping plates are matched with the four centering plates, the centering plates are driven by the correcting part to conduct synchronous extrusion and correction, it is ensured that the aluminum alloy plate is accurately aligned with the mold, and the machining efficiency is improved. Therefore, when the end of the aluminum alloy plate is clamped subsequently, the end of the aluminum alloy plate is filled through the mold, the situation that the plate is seriously deformed or damaged due to the fact that the clamping force of the clamping plate is too large is avoided, meanwhile, rapid mold replacement is achieved through an inserting rod and inserting groove matching structure of the assembling and disassembling piece, and the equipment maintenance and production switching efficiency is remarkably improved; and the downtime is reduced.

The utility model provides a safe walking protection device, and belongs to the technical field of high-altitude safety equipment. The safe walking protection device comprises an auxiliary wheel and a mounting part, the auxiliary wheel is rotationally connected with the mounting part, a safety cable penetrates through the auxiliary wheel, a clamping part is fixedly connected to the mounting part on the auxiliary wheel, the safety cable is blocked in the auxiliary wheel through the clamping part, and the auxiliary wheel is fixedly connected with the safety cable through the clamping part. The outer circle of the auxiliary wheel movably abuts against the inner wall of the clamping piece, and the front end and the rear end of the clamping piece are both arranged to be horn mouths. In the application, the safety cable is blocked in the auxiliary wheel by using the clamping piece, the safety cable is prevented from tripping, the safety is improved, the clamping piece also provides axial support for the excircle of the auxiliary wheel, the situation that the safety cable is tripped due to severe deformation of the auxiliary wheel caused by impact is avoided, and the safety is further improved.

The present invention discloses a method for controlling the top and pressure relief of surrounding rocks by layered cutting of small coal pillars in a hard roof tunnel section, which relates to the technical field of safe mining of coal mines and tunnel surrounding rock control. The method comprises the following steps: S1. Determine the periodic pressure step distance of the working face according to the on-site geological conditions and the damage characteristics of the overburden in the mining area; S2. Establish a mechanical model to determine the primary support strength of the tunnel; S3. The tunnel boring machine cuts and supports the tunnel; S4. Cuts off the direct top of the coal pillar along the edge of the coal pillar on the outside; S5. Establish a mechanical model to determine the secondary support strength of the tunnel; S6. Directly cut the top of the basic top arc triangle block; S7. Grouting reinforcement improves the structure and overall strength of the small coal pillar; S8. Real-time dynamic monitoring of the deformation of the tunnel surrounding rock. The present invention improves the recovery rate of coal resources, improves the tunnel support effect, and realizes safe and efficient production of mines.