481 results about "Upper segment" patented technology

The invention discloses a steeply-inclined nearly-upright extra-thick coal seam horizontal section fully-mechanized caving filling mining method, and relates to the technical field of coal mining. The method includes the following steps that the nearly-vertical super-thick coal seam is divided into different mining levels of 20-40 m, a low-position mining and releasing system is arranged at the horizontal position of the junction of a current section and a lower section, a high-position filling system is arranged in a top plate or bottom plate rock pillar at the horizontal position of the junction of the current section and an upper section, and the coal seam of the current section is mined through a fully-mechanized caving mining method; along with advancing of the coal face, a separation net and slurry blocking cloth are laid on the goaf through a net laying and slurry blocking support; a suspended cavity space detection characterization robot arranged in the high-position filling system is used for carrying out goaf space detection; the method comprises the following steps: dividing a nearly upright extra-thick coal seam into different sections for section mining, performing in-situ grouting filling on a subsequent mining space in the mining process, forming a stable filling interface in a goaf, fundamentally weakening stress concentration and reducing energy accumulation, and realizing collaborative proceeding of filling and coal mining.

The invention discloses a welding piece anti-deformation fixing bottom bracket which comprises a bottom table plate, a supporting rod frame assembly and an exchange type extension mechanism, a detachable clamping assembly is arranged on the upper section of the supporting rod frame assembly, and the supporting rod frame assembly can be adjusted in a locking hole in the bottom table plate in a rotating or sliding mode. And the clamping assembly is driven by the exchange type extension mechanism to achieve free position adjustment in a three-dimensional space, the exchange type extension mechanism is used for adaptive extension connection between the two supporting rod frame assemblies, and the exchange type extension mechanism assists all-directional flexible adjustment in the clamping direction of the clamping assembly by conducting angle exchange on the supporting rod frame assemblies connected in an extension mode. According to the anti-deformation fixed bottom bracket for the welded part, for a fixed clamping structure of the welded part in the fixed bottom bracket, free position adjustment in a three-dimensional space is achieved, all-directional flexible adjustment in the clamping direction is achieved, and the anti-deformation fixed bottom bracket can adapt to different structural forms of all parts in the welded part and different butt joint requirements of all the parts.

The utility model relates to the technical field of double-row tapered roller bearings, in particular to a device for improving the installation clearance adjustment efficiency of a double-row tapered roller bearing, which comprises a bearing body and a detection assembly, the bearing body comprises an inner ring, a tapered roller, an outer ring and a bearing seat which are sequentially arranged from inside to outside; the inner ring is sleeved and detachably connected to the shaft rod, the outer ring is divided into an upper section and a lower section, a space ring is arranged between the upper section and the lower section, the outer ring is sleeved with the bearing seat, the top end of the inner side face of the bearing seat is fixedly connected with an upper limiting ring, and the upper limiting ring is located over the outer ring and used for limiting the top end of the outer ring; the bottom end of the bearing seat is detachably connected with a lower limiting ring; the lower limiting ring is used for limiting the bottom end of the outer ring; the detection assembly comprises a hanging ring and a dial indicator, the hanging ring is detachably arranged at the top end of the bearing seat, and the dial indicator is detachably arranged at the top end of the bearing body and used for detecting installation clearance. The device has the effects that the mounting clearance is convenient to adjust, and the efficiency is improved.

The invention discloses a zoning treatment method for preventing oversized-diameter shield tunnel segments from floating, which comprises the following steps: step 1, arranging an expansion film bag on the outer side of an upper segment, and pouring cement-water glass quick-setting slurry into the film bag through a sleeve to enable the cement-water glass quick-setting slurry to expand to form a pressure arch; 2, pre-stressed anchor rods are arranged on the lower segment, and pressure-bearing gaskets are arranged; 3, after construction in the step 1 and the step 2 is completed, grouting is conducted on the middle segment, cement-water glass double-liquid slurry is injected from the middle segment, the slurry diffuses from the middle to the vertical direction in a fan shape, and the space behind the segment wall is fully filled; the grouting body, a film bag pressure arch formed on the upper portion and an anchor rod anti-pulling system arranged on the lower portion jointly form a continuous bearing structure to cooperatively restrain overall floating of the duct piece.

The invention discloses an integrated encapsulation structure of an inductance electrical element of a transformer, which comprises an integrated encapsulation heat dissipation shell, and the integrated encapsulation heat dissipation shell is at least provided with a first lower groove, a second lower groove and a third lower groove in sequence along the length direction; the upper parts of the first lower groove, the second lower groove and the third lower groove are communicated with one another, so that the first lower groove, the second lower groove and the third lower groove jointly form an encapsulation pool; all the elements are relatively independent, normal work of other elements is prevented from being affected by overheating of a certain element, meanwhile, the upper sections of the first lower groove, the second lower groove and the third lower groove are communicated with one another, the glue filling process can be completed at a time, and the problem of complex procedures caused by respective glue filling is solved.

The present invention relates to a stretcher for transporting the wounded, and in particular to a deformable stretcher. The stretcher comprises an upper stretcher section, a middle stretcher section, a lower stretcher section and a rotation drive mechanism, wherein the upper stretcher section, the middle stretcher section and the lower stretcher section are rotationally connected in sequence; the upper section rotation axis of the upper stretcher section is located on the axis of the wounded's hip joint; the rotation drive mechanism is arranged on the middle stretcher section and connected to the upper stretcher section and the lower stretcher section, and the rotation drive mechanism is used to drive the upper stretcher section and the lower stretcher section to rotate relative to the middle stretcher section. The present invention can achieve that when the stretcher is deformed, the torso, head and thigh of the spinal patient are always effectively fastened, thereby avoiding secondary injuries to the spinal patient during transportation.

The utility model relates to a roadbed grouting reinforcement structure, which effectively solves the problem of poor sealing reliability of a roadbed grouting orifice. According to the technical scheme, the grouting device comprises a grouting pipe, the grouting pipe is slidably sleeved with a first sealing ring, the first sealing ring is of a two-section step type, the diameter of the upper section is large, the diameter of the lower section is small, an upper pressing plate is arranged at the upper end of the first sealing ring, a lower pressing plate is arranged at the lower end of the first sealing ring, and a screw penetrating through the upper pressing plate, the first sealing ring and the lower pressing plate is further arranged; a nut is screwed at the upper end of the screw; a hydraulic cylinder is installed between the first sealing ring and the grouting pipe, a plurality of radial nail thorns are evenly distributed on the circumference of the side wall of the hydraulic cylinder, the nail thorns penetrate through the cylinder wall of the hydraulic cylinder and outwards penetrate through the first sealing ring, a piston is fixed to the lower end of the upper pressing plate, and the lower end of the piston is inserted into an oil cavity of the hydraulic cylinder. According to the sealing device, the sealing effect can be improved, and the first sealing ring cannot be jacked open by grouting pressure, so that the opening of the grouting hole can be effectively sealed all the time.

The invention belongs to the technical field of trackless mining preparation drift type filling mining, and discloses a steeply inclined thin ore body segmentation-free roadway mining method, which comprises the following steps of space partitioning and foundation engineering construction; stoping and filling in layers; a slope coping channel for trackless mining and transportation equipment to pass through is formed on an upward layered bottom plate on the top of the connection roadway of the lower stope through the blasting technology, the slope coping channel communicates with the segmented winze through the short connection roadway, and ore removal is conducted through the segmented winze; and entering the previous layer through the coping channel, and repeating the steps of stoping and filling the layer and constructing the coping channel until the mining is finished. A slope channel is formed by blasting at the top of a layered stope joint roadway, an upper layer of mine field is communicated with a draw shaft and a ventilation shaft of an upper section, and the sectional draw shafts are combined with the collaborative layout of top and bottom stage haulage drifts and ore loading transverse drifts, so that the beneficial effect that the whole accurate mining work amount is obviously reduced is achieved.

The utility model relates to a beam column reinforcing steel bar connecting structure of a concrete prefabricated assembly type building, which comprises a prefabricated column die cavity, a prefabricated beam die cavity and a prefabricated floor die cavity, and a prefabricated column reinforcing steel bar keel and a prefabricated beam reinforcing steel bar keel are pre-mounted in the prefabricated column die cavity and the prefabricated beam die cavity respectively. The prefabricated column steel bar keel comprises at least two column outer side steel bars and at least two column inner side steel bars, the prefabricated beam steel bar keel comprises at least two beam outer side surface bars and at least two beam inner side steel bars, and the column outer side steel bars and the beam outer side surface steel bars are manufactured by bending the same first reinforcing steel bar to form an upper section and a lower section which are perpendicular to each other. The lower section is pre-installed in a prefabricated column steel bar keel, and the upper section is pre-installed in a prefabricated beam steel bar keel in a prefabricated beam mold cavity. The connecting strength of the prefabricated column and the prefabricated beam is improved, and the pressure resistance, the shock resistance, the supporting stability and the house safety are improved.

The invention relates to a recoverable unlocking bracket for a large-aperture space remote sensing camera, which is characterized in that in a locking state, two explosive bolts respectively penetrate through central holes of an upper pressing block and a conical block and then are connected with an upper section and a lower section of a threaded connecting cylinder, and four wedge blocks are uniformly distributed along the periphery of the threaded connecting cylinder; two wedge-shaped grooves in the wedge block are matched with a first conical boss of the upper support and a second conical boss of the lower support respectively, an annular spring is arranged in a rectangular groove, a plate spring penetrates through a through hole of the wedge block and a rectangular hole of the upper pressing block, then the lower end of the plate spring is hooked on the annular groove of the lower support, and the upper end of the plate spring is fixed to the upper pressing block. And the explosive bolt is detonated and unlocked, the wedge-shaped groove is separated from the conical boss, the conical block is withdrawn, and the four wedge blocks are recovered together and clamp the threaded connecting cylinder. After unlocking, all the free structural parts in the support are restrained and recycled, the risk that the support is stuck due to irregular movement of the free structural parts or the free structural parts move to the outside of the support to become redundant objects is eliminated, and meanwhile the requirement for the large movement distance after the support is unlocked can be met.

The invention discloses a composite material tensile sample reinforcing sheet bonding tool and a bonding method thereof. The bonding tool comprises a clamping plate, an upper top plate and a lower top plate, a plurality of screw holes are formed in the edge and the center of the clamping plate, and square cushion blocks with through holes in the centers are arranged at the positions of the screw holes in the two sides of the clamping plate; a plurality of sample grooves are formed in the clamping plate and penetrate through the clamping plate, and the sample grooves are matched with samples in shape; screw holes are formed in the edges and the centers of the upper top plate and the lower top plate; a plurality of reinforcing sheet grooves are symmetrically distributed in the upper sections and the lower sections of the upper ejection plate and the lower ejection plate along the vertical center line respectively, the reinforcing sheet grooves are matched with the sample grooves, a reverse ejection hole is formed in the center of each reinforcing sheet groove, and a glue overflow hole is formed in the corner of each reinforcing sheet groove. By controlling the position between the sample and the reinforcing sheet, fixing the bonding position between the sample and the reinforcing sheet and adopting pressurized demolding, the reinforcing sheet in the obtained composite material tensile sample is precise in bonding and excellent in bonding performance.

Provided is a collapsible portable climbing net, featuring a left and right lateral pole, each comprising separable or connectable segments. The top pole connects the upper segments of the lateral poles, while the bottom pole connects the lower segments. A net is secured between the lateral poles and the top and bottom poles. The design allows for folding the lateral poles for compact storage, passing the poles through collars for easy assembly, and includes additional segments connected by connectors. The top and bottom poles are pivotally connected, enabling the net to be folded compactly.

The invention discloses an aircraft nose landing gear structure and a folding and unfolding method, the aircraft nose landing gear structure comprises a fuselage connecting assembly, a strut assembly, an oil injection valve assembly, a shimmy damping assembly, a wheel assembly and a folding and unfolding control assembly, the fuselage connecting assembly is arranged at the upper section of the strut assembly, the top end of the strut assembly is connected with a fuselage, and the lower end of the strut assembly is connected with the wheel assembly; the supporting column assembly is arranged on the machine body and fixedly connected with the machine body through the machine body connecting assembly, the oil injection valve assembly is arranged on the supporting column assembly and higher than the horizontal position of the machine body connecting assembly, the upper portion of the anti-swing assembly is connected with the supporting column assembly, the lower portion of the anti-swing assembly is connected with the wheel assembly, and the two ends of the folding and unfolding control assembly are connected with the supporting column assembly and the machine body respectively. The first semicircular piece and the second semicircular piece are fixed through a tightening bolt, the friction plate is made of a carbon-carbon composite material, and vibration transmitted to a machine body is reduced. The split structure facilitates replacement of the friction plates, the whole shimmy damper does not need to be disassembled, and maintenance time is shortened.

The invention discloses a tiltable top drive guide rail, and relates to the technical field of drilling equipment, the tiltable top drive guide rail comprises an upper section guide rail, a middle section guide rail and a lower section guide rail which are arranged in sequence, an upper fixing device is fixed on the upper section guide rail, and the upper fixing device is fixedly connected with a derrick cross beam; the lower end of the upper section guide rail is rotationally connected with the upper end of the middle section guide rail through a guide rail pin shaft, the lower end of the middle section guide rail is connected with a lower fixing device through an inclined oil cylinder, and the lower fixing device is fixedly connected to the lower section guide rail and fixedly connected with a derrick cross beam. A reverse twisting device is further connected between the lower end of the middle section guide rail and the lower fixing device and is used for bearing the upper buckling torque of a top drive; the inclined oil cylinder can drive the middle-section guide rail to be in a vertical state or an inclined state, and when the middle-section guide rail is in the inclined state, the inclination angle of the middle-section guide rail is kept consistent with that of a drill rod in a mouse hole. The drilling operation time can be shortened, the drilling efficiency is improved, and the labor intensity of workers is relieved.

A sleep pad system includes an upper segment generally sized and shaped to rest beneath the torso and head of a lying human, and a lower segment generally sized and shaped for the human's lower extremities. The upper segment construction imparts superior cushioning and warmth properties relative to the lower segment. The upper segment is configured for accordion-type folding, thereby allowing transformation into a compact and sturdy article having utility as a structural support. The lower segment is constructed of significantly lighter material than the upper segment, thereby decreasing the overall weight of the system.

The invention relates to the field of transmission system detection, and particularly discloses a method for measuring the abrasion loss of a bearing bush of a water-lubricated bearing engineering prototype, which comprises a measuring tool, the measuring tool comprises a shell of the water-lubricated bearing engineering prototype and the bearing bush positioned in the shell, and a through measuring hole is formed in the highest point of the top of the shell in the vertical direction of the bearing bush. The lower section of the positioning block is inserted into the upper section of the measuring hole, the upper section is a flange section positioned outside the measuring hole, and a through inner hole is also formed in the positioning block. The change of the gap delta between the outer circular surface of the top of the tail shaft and the upper surface of the inner circular surface of the bearing bush is obtained by using the distance rod before and after the test by using the tool, and the change is reflected on the change of the distance from the upper end of the distance rod to the top surface of the flange section of the positioning block, namely the difference value between X1 and X2; the difference value is actually the abrasion loss X of the bearing bush of the water-lubricated shaft. The method is easy to operate, high in precision and low in equipment investment and test cost.

The utility model relates to the technical field of anti-floating anchor rods, and discloses a prestress anti-floating anchor rod which comprises a bottom anchoring plate, three rod bodies and a first triangular plate, the number of the rod bodies is three, and the three rod bodies are fixed to the upper end face of the first triangular plate in an annular array mode. The bottom reinforcing piece is arranged on the lower end face of the bottom anchoring plate and used for reinforcing the bottom end of the bottom anchoring plate; the rod body reinforcing piece is telescopically arranged on the rod body and is used for reinforcing from the upper section of the rod body; the three rod bodies are fixed to the first triangular plate in the annular array mode and matched with the first triangular plate and the second triangular plate, by means of the stability of a triangle, the capacity of resisting building foundation buoyancy can be improved, and the overall stability of the structure is remarkably enhanced; the pressure promotes the connecting column to rise, the top block extrudes the movable block to move outwards to be inserted into a side soil layer, the bottom stability is improved, and the anti-floating capacity is improved.

The invention provides a cleaning accessory and cleaning equipment, and belongs to the field of cleaning equipment. The cleaning accessory comprises an upper section assembly, a middle section assembly and a lower section assembly. The bottom end of the upper section assembly is provided with a driving surface which is obliquely arranged relative to the axis of the cleaning accessory; the middle section assembly and the upper section assembly are connected in a relatively rotating mode and provided with a movable first transmission piece. The lower section assembly is provided with a dust cabin used for collecting dust, a cabin door used for opening and closing the dust cabin and a second transmission part used for triggering the cabin door to be opened. When the upper section assembly rotates relative to the middle section assembly, the driving face acts on the first transmission part so that the first transmission part can drive the second transmission part to trigger the cabin door to be opened. According to the cleaning accessory and the cleaning equipment, the lower dust cabin door can be opened only by rotating the upper section assembly closer to the natural holding area, and the problem that the cover opening operation of the dust cabin door of an existing rod type dust collector is inconvenient can be solved.

The utility model discloses a main nozzle structure of a sectional type flange, which comprises a main nozzle structure and a heater arranged on the side portion of the main nozzle structure, and the main nozzle structure comprises a lower section main nozzle and an upper section main nozzle detachably connected with the lower section main nozzle. And a runner is arranged between the upper-section main nozzle and the lower-section main nozzle. The utility model has the beneficial effects that the main nozzle structure is divided into two sections, the lower section main nozzle can be used as a standard part, the diameter of the maximum excircle of the main nozzle structure is shortened by 70mm, the loss of raw materials can be greatly reduced, the cost is saved, and the standardization degree is improved; and due to customized processing, the processing difficulty is greatly reduced, the process is optimized, and the cost is reduced.

The combined oil seal comprises a hydraulic part and an oil seal body, the oil seal body comprises a supporting end cover and a sealing part, the supporting end cover is of a hard plate-shaped structure, a through hole is formed in the center of the supporting end cover, the sealing part is made of plastic nonmetal materials, a through hole is formed in the center of the sealing part, and the sealing part comprises an upper section and a lower section. The supporting end cover wraps the outer surface of the upper section of the sealing piece, the lower section of the supporting end cover is of a conical structure, the oil seal is arranged at the connecting position of the adjusting screw rod and the valve body in the hydraulic piece, and the adjusting screw rod and the valve body are assembled in an adjustable mode.

Anchor device (1) to protect against falls, - with a base plate (11), - and with a stop post (2) comprising an upper segment (3), preferably having a stop eyelet (8) at its free end (7), and a lower segment (4) which is connected on the one hand to the upper segment (3) and on the other hand to the base plate (11), wherein the stop post (2) is designed to absorb part of the fall energy by deformation in the event of a fall, - and with at least one mounting connector (17) for connecting the base plate (11) to a profile rail (15) serving as a force-absorbing structure, wherein the mounting connector (17) is designed to be inserted into an open cross-section (30) of the profile rail (15) in order to introduce the transmission force remaining after absorbing part of the fall energy into the rail cross-section in the event of a fall, for which purpose the mounting connector (17) rests on a number of surfaces (22, 21, 25) of the profile rail (15) in the mounted state.

Guide mechanism of the movable iron core (5) of the high-voltage DC relay, characterized in that it comprises a push rod, wherein the upper segment (1) of the push rod is located on the yoke plate (4) and is attached to the arrangement of the dynamic contacts, and wherein the middle segment (2) and the lower segment (3) of the push rod are led downwards through the yoke plate (4), and wherein the middle segment (2) of the push rod is attached to the movable iron core (5), and wherein the movable iron core (5) is located within the permeability cylinder (7) of the U-shaped yoke (6), and wherein a lower sleeve (8) is attached within the permeability cylinder (7), and wherein the lower sleeve (8) is located below the movable iron core (5), and wherein the lower sleeve (8) forms a lower guide hole (11) extending vertically.and wherein the lower segment (3) of the push rod is always fitted within the lower guide hole (11) of the lower sleeve (8), and wherein the push rod and the inner wall of the lower guide hole (11) form a smooth contact, wherein the lower sleeve (8) is a conical structure in which the diameter of the upper end is larger than the diameter of the lower end, wherein the outer diameter of the upper end of the lower sleeve (8) is smaller than the inner diameter of the permeability cylinder (7), and wherein the outer diameter of the lower end of the lower sleeve (8) is larger than the inner diameter of the permeability cylinder (7), and wherein the lower sleeve (8) is fitted by bottom-up compression within the permeability cylinder (7).

The utility model belongs to the technical field of detection tools, and particularly relates to a height difference detection tool. The device comprises a shell, the shell is divided into an upper shell body and a lower shell body, the upper shell body and the lower shell body are connected through a bolt, two adjacent cavities and two measuring columns are arranged in the shell, the two measuring columns are arranged in the cavities respectively, the upper sections and the lower sections of the two measuring columns can stretch out of the shell, the upper sections of the two measuring columns are attached to each other, and the lower sections of the two measuring columns are attached to each other. And the distance between the lower sections of the two measuring columns is matched with a measured part. The utility model is used for solving the technical problem that the existing measuring tool cannot quickly and accurately detect whether the height difference of different parts after superposition welding or abutted seam welding meets the design requirement.

The utility model discloses a plate thickness control detection instrument in a construction process, which comprises a sleeve and further comprises a tray with one end connected to the lower end of the sleeve; the limiting locking piece is connected to the upper end of the sleeve in a communicating manner; the measuring rod is sleeved in the sleeve; the spring is located in the sleeve, one end of the spring is connected with the measuring rod, and the other end of the spring is connected with the tray; wherein the upper section of the measuring rod is also provided with a graduated scale. The utility model has the advantages of simple operation, strong applicability, simple structure, convenient maintenance and strong durability, can effectively solve the error problem in the management of the construction process, reduces the probability and proportion of unqualified products, reduces the engineering cost risk, realizes the improvement of the construction precision and quality control, ensures the stability and reliability of the entity quality, and improves the construction efficiency. And a more practical and more accurate measurement result can be provided.

The invention discloses a segmented staggered wind power lattice type tower which comprises a steel tower drum, conversion nodes and a lattice type tower body, the lattice type tower body comprises a lattice type tower body upper section and a lattice type tower body lower section, the lattice type tower body upper section is located in the range above a blade tip, and the lattice type tower body lower section is located in the range below the blade tip; the lower end of the lattice type tower upper section is inserted into the lattice type tower lower section, the lattice type tower upper section and the lattice type tower lower section are connected through a conversion web member, and the lattice type tower upper section and the lattice type tower lower section are arranged in a rotating and staggered mode. The lattice type tower body is divided into the upper section and the lower section which are arranged in a staggered mode, so that the section of the tower body can be rapidly expanded below the blade tip, the bearing efficiency is improved, meanwhile, non-through tower columns provide conditions for applying prestress of different levels in a segmented mode, the section of the upper section of the tower body is small, large prestress is needed, and the section of the lower section of the tower body is large. Only small prestress is needed, the prestress is applied according to needs, and meanwhile the material consumption of the prestress cable and the tower column is saved.

The stacking device comprises a machine frame, a top plate, a plurality of first limiting rods and a plurality of second limiting rods, a to-be-stacked sheet top plate is installed on the top of the to-be-stacked sheet machine frame, a discharging opening is formed in the to-be-stacked sheet top plate, the first limiting rods of the to-be-stacked sheets are vertically arranged on the left front portion and the right front portion of the discharging opening of the to-be-stacked sheets respectively, and the second limiting rods of the to-be-stacked sheets are vertically arranged on the top of the to-be-stacked sheet machine frame. The multiple to-be-stacked piece second limiting rods are vertically arranged on the left rear portion and the right rear portion of the to-be-stacked piece discharging opening correspondingly, the lower sections of the multiple to-be-stacked piece second limiting rods are vertical, and the upper sections of the multiple to-be-stacked piece second limiting rods incline outwards from bottom to top correspondingly. The stacking device provided by the utility model can reduce the possibility of clamping stagnation of the elliptical sheets at the blanking port, can reduce the possibility that the aluminum sheets are scratched by the limiting rods, and has the characteristics of simple structure and easiness in manufacturing.

The utility model relates to a knife assembly and a food processor. The cutter assembly comprises a cutter head assembly and a blade assembly, the cutter head assembly comprises a cutter head and a cutter shaft movably arranged on the cutter head, the cutter shaft comprises a lower section and an upper section which are located above the cutter head and are coaxial, the upper section is connected to the upper portion of the lower section, the upper section is a big-end-down step section, and an inclined step face is formed at the position of a step. The blade assembly comprises a cutter sleeve and a blade arranged on the cutter sleeve, the cutter sleeve is provided with a cutter sleeve hole allowing the cutter shaft to penetrate through, and the cutter sleeve detachably sleeves the lower section from the upper section and is in transmission connection with the lower section in the circumferential direction. The anti-disengaging piece is arranged on the upper section in a sleeving mode, located above the cutter sleeve, supported on the step face, capable of moving along the step face and provided with a first position and a second position, at least part of the projection of the anti-disengaging piece and the projection of the cutter sleeve in the axial direction of the cutter shaft are overlapped at the first position, and at the second position, at least part of the projection of the anti-disengaging piece is overlapped. The projection area of the anti-disengaging piece in the axial direction of the cutter shaft is located in the projection area of the cutter sleeve hole in the axial direction of the cutter shaft. According to the scheme, the knife assembly can be quickly disassembled and prevented from falling off.

The application discloses a lifting roller device applied to a walking shaft and used for supporting a drag chain, which comprises a plurality of roller mechanisms, the roller mechanisms are distributed at equal intervals along the upper end of the drag chain and used for supporting the bottom of the upper section of the drag chain, each roller mechanism comprises a support assembly, a rotating frame and two roller assemblies, the rotating frame is rotatably installed on the support assembly through a rotating piece, the two roller assemblies are installed on the rotating frame and are distributed at a 90-degree angle, when one roller assembly is arranged in the width direction of the drag chain and is used for supporting the bottom of the upper section of the drag chain, the other roller assembly is located on the side of the drag chain and is parallel to the upper section of the drag chain. The application effectively avoids the phenomenon that the drag chain is suspended and falls down, thereby avoiding the phenomena that the drag chain is rubbed, pulled and damaged, improving the stability and service life of the drag chain, and reducing the on-site maintenance cost.