119 results about "Thrust block" patented technology

The invention discloses an aircraft folding type propeller mechanism and an aircraft, the aircraft folding type propeller mechanism comprises a rotating shaft, a driving part, a first propeller and a second propeller; the driving piece is connected with one end of the rotating shaft; the first propeller comprises a first propeller hub and a first propeller blade which are connected with each other, the first propeller hub is fixedly connected to the rotating shaft, a thrust groove is formed in the side, away from the driving part, of the first propeller hub, and a first thrust surface which is obliquely arranged is arranged at the bottom of the thrust groove; the second propeller comprises a second propeller hub and a second propeller blade which are connected, the second propeller hub is movably arranged on the rotating shaft in a sleeving mode and located on the side, away from the driving piece, of the first propeller hub, and a thrust block extending into the thrust groove is arranged on the side, facing the first propeller hub, of the second propeller hub in a protruding mode; and the thrust blocks are matched with the thrust grooves, so that the second paddles are in a folded state or an unfolded state relative to the first paddles. According to the folding propeller mechanism of the aircraft, the resistance of the aircraft in the flight process is reduced, and the flight performance of the aircraft is improved.

The invention relates to an infinite intelligent regulation and control fracturing sliding sleeve which is particularly suitable for development of unconventional oil and gas resources such as shale gas and tight oil. The concrete structure of the infinite intelligent regulation and control fracturing sliding sleeve dart part comprises an outer shell, a lower baffle disc, an upper baffle disc, a bolt, a spring, a clamping ring, a blocking ball, a thrust block, a thrust bearing, a flow dividing block, a motor, a flow divider, a capacitive sensor, a silicon rubber sealing piece, a control module and a flow divider end cover. When the infinite intelligent control fracturing sliding sleeve dart part passes through a designated position, the infinite intelligent control fracturing sliding sleeve dart part judges and counts each part needing to be fractured through the three capacitive sensors, when a preset value is reached, the tool is switched to an activated state, the blocking ball is impacted under the pressure of drilling fluid, and the part needing to be fractured is fractured. The thrust block is pushed, the thrust block opens the piston on the casing pipe under the pressure building effect, and fracturing operation is achieved. And the limitation of the size of a steel ball in the traditional ball throwing type sliding sleeve technology is avoided, the operation complexity is reduced, the construction efficiency is improved, and a new technical means is provided for efficient development of unconventional oil gas.

The invention discloses an aviation main shaft tester for applying an impact load and a continuous centrifugal load and a centrifugal loading method for simulating an engine bearing test in a blade falling state, and relates to the technical field of impact tests. The problems that an existing aviation main shaft bearing testing device can only apply stable loads and cannot apply impact loads and centrifugal loads at the same time are solved. One end of a spindle is connected with a spindle motor driving shaft through a flexible coupler, the spindle is rotationally connected with a base through a first accompanying test bearing and a tested bearing, a centrifugal loading unit is located on the side, close to the spindle motor, of the tested bearing, a permanent magnet is installed at the upper end of a straight rod, a coil assembly and the permanent magnet are arranged correspondingly, and the lower end of the straight rod is connected with a thrust block. The slopes on the two sides of the thrust block make contact with the two centrifugal blocks correspondingly, and the two centrifugal blocks are connected with the main shaft through the two compression springs correspondingly. The method is used for evaluating the reliability of the engine main shaft bearing which bears the instantaneous impact load and the continuous centrifugal load in the simulated rotor blade falling state.

The utility model relates to a light large-span wave compensation type seaborne lightering device which comprises a mechanical body, a hydraulic system and an electric control system, and the mechanical body comprises a container type base, an anti-swing base assembly, a rotary tower body assembly, an arm frame assembly, a working basket assembly, a winding and unwinding winch assembly and a variable-amplitude oil cylinder. The container type base is connected with a ship body base, and the anti-swing base assembly is connected with the container type base through a fastener and a thrust block. The slewing tower body assembly is connected with the anti-swing base assembly through a slewing support; the arm support assembly is connected with the slewing tower body assembly through a variable-amplitude oil cylinder and a pin shaft assembly; the working basket assembly is connected with the arm support assembly through a variable-amplitude oil cylinder and a pin shaft assembly; the winding and unwinding winch assembly is installed at the lower end of the boom assembly. The hydraulic system is connected with the anti-swing base assembly, the rotary tower body assembly, the arm frame assembly, the working basket assembly, the winding and unwinding winch assembly and the variable-amplitude oil cylinder. The electric control system is connected with the hydraulic system. The maritime lightering device has high environment self-adaptive capacity and high reliability.

The invention provides an automatic grounding wire clamp which comprises a grounding wire clamp body, an electric locking mechanism and an execution assembly, the electric locking mechanism comprises a locking sliding block driven by the execution assembly to move, and the execution assembly is started when a locking switch and an unlocking switch are triggered. The locking sliding block is driven to move close to the hook part of the grounding wire clamp main body to form a locking state for locking the cable and to move away from the hook part to form an unlocking state for unlocking the cable; a locking push block is movably arranged at the groove cavity of the hook part, is extruded by the cable sliding into the groove cavity of the hook part, and slides to trigger the locking switch; the upper part of the grounding wire clamp main body is provided with a lifting ring for lifting the unmanned aerial vehicle, the lifting ring can slide along the vertical direction, an unlocking push block is fixed on the lifting ring, and the unlocking switch is triggered when the unlocking push block slides upwards along with the lifting ring. According to the invention, automatic locking and unlocking can be realized in the mounting and dismounting process of the grounding wire clamp.

The utility model discloses an automatic locking and unlocking mechanism for a rotating shaft, which comprises a locking sleeve, a rotating drum is sleeved with the locking sleeve, the locking sleeve is connected with the rotating drum through a pin, a spring is arranged at the upper end of the locking sleeve, the locking sleeve is provided with a clamping groove, and the clamping groove corresponds to a bulge on a limiting baffle seat; and the rotary drum penetrates through the thrust pressing block. When the pin shaft needs to be rotated, unlocking is achieved through pushing of the wrench, and when the pin shaft does not need to be rotated, the locking sleeve on the pin shaft can be automatically clamped into the baffle to limit rotation of the pin shaft; operation is simple, operation omission of operators is avoided, and safety is improved.

A retaining device for mounting a slide rail to a server rack between front and rear ends of the server rack includes a rear support unit connected with the rear end, and a front support unit connected with the slide rail. The rear support unit includes a rear support rail and a biasing member. The front support unit includes a front support rail telescopically disposed on the rear support rail, and a front bracket connectable with the front end and the slide rail. The front support rail has a thrust block abutting against the biasing member. The front support rail is moved rearwardly to move the slide rail and the front bracket toward the rear support rail so as to vary a distance between the front bracket and the rear end, and the thrust block compresses the biasing member to tightly connect the front bracket with the front end.

The utility model discloses a vertical thrust bearing thrust pad axial limiting structure which comprises a supporting piece and a thrust head, the thrust head is located right above the supporting piece, the supporting piece is an annular piece, a plurality of positioning concave holes are formed in the top face of the supporting piece, the thrust pad is located right above the corresponding positioning concave holes, and the thrust head is located above the supporting piece. The top surface of the thrust pad clings to or is close to the bottom surface of the edge part of the thrust head; a bottom supporting block is inserted in the lower portion of the positioning concave hole in a sleeved mode, a guide sleeve is installed on the top face of the bottom supporting block, the top face of the guide sleeve abuts against the bottom face of the thrust pad in a pressing mode, and the bottom supporting block is fixed to the thrust pad through a fixing bolt. When the thrust block is lifted, the thrust pad can be limited, the thrust pad is prevented from being lifted along with the thrust block, and normal use of the thrust pad is guaranteed.

The invention provides a mechanical hook type girder pitching safety hook and a working method, relates to the field of quay crane safety facilities, and aims to solve the problems of power dependence defect of the existing hook type safety hook and high alignment difficulty of a plug pin type safety hook, the pitching safety hook is composed of a base, a hook tongue, a lock pin and a hook, and the hook tongue is rotatably mounted on the base; the thrust part and the hook part are ingenious in design, when the hook abuts against the thrust part, the hook tongue can rotate through pushing of the hook, rapid hooking action is achieved, manual high-altitude operation is not needed, the operation efficiency is greatly improved, and meanwhile the falling risk of personnel is eliminated; the lock pin is installed on the base in a sliding mode in the direction parallel to the rotating axis of the hook tongue, the trigger block and the lock block of the lock pin can synchronously act along with the action of the thrust block, the mechanical structure is simple, corrosion resistance is better in the high-salt-mist and high-humidity environment of a port, and the maintenance cost is reduced.

The limiting device comprises a crank arm, the crank arm is rotationally connected with a guide vane sleeve flange, a crank arm ring groove is formed in the outer wall of the crank arm, a thrust block is arranged on the guide vane sleeve flange, a thrust head extends out of the thrust block, and the structure of the thrust head is in sliding fit with the crank arm ring groove. The utility model has the following advantages: (1) the external modular design is convenient for intuitively monitoring the wear state and quickly dismounting and replacing, the maintenance-free stop block is welded on the guide vane sleeve flange, and the anti-vibration stability is enhanced by means of the top cover structure; (2) the limiting efficiency is enhanced by double stop blocks, the full opening / closing position of the guide vane is accurately locked, the lifting of the guide vane and the abnormal opening degree are effectively inhibited, and the chain damage is blocked in an accident; (3) an independent dismounting system avoids the interference of associated equipment and ensures the operation safety of the unit; and (4) the adaptability is high, a standardized device can be customized according to the unit scale, and the installed capacity limitation is broken through.

The invention relates to the technical field of machining, in particular to a hydro-generator thrust collar machining device and method, the machining device is used for machining a thrust collar of a hydro-generator, the machining device comprises a placing assembly, a rotating assembly and a machining assembly, and the machining assembly is arranged on a rotating platform and used for machining the thrust collar; a rigid supporting system is formed by the machining base and the fixing support, the fixing gear serves as an accurate transmission datum point, and when the driving part drives the rotating platform to rotate around the fixing gear, the position of the corresponding tool assembly can be adjusted so that machining can be conducted on the peripheral face of the thrust block at all angles, and machining precision is improved. That is, the machining cutter keeps synchronous displacement with the workpiece on the rotating platform, the relative position of the cutter system and the workpiece is kept constant through the structure, and positioning deviation generated by movement of the workpiece in traditional split equipment is eliminated. The problem that in the prior art, on-site machining of a thrust block of a hydro-generator cannot be achieved is solved.

The utility model relates to the technical field of pipe fitting machining, and discloses a pipe fitting clamping structure of a full-automatic pipe bending machine, which comprises a first supporting plate and a fixing plate fixedly connected to the outer wall of the first supporting plate, a moving mechanism is arranged on the first supporting plate, a clamping mechanism is arranged above the moving mechanism, and a clamping mechanism is arranged above the clamping mechanism. A pipe fitting is placed on the clamping groove in the top end of the lower clamping plate, and the hydraulic cylinder is started to drive the thrust block to move leftwards to extrude the stress block, so that the lower clamping plate can be driven to move upwards, and the pipe fitting placed at the top end of the lower clamping plate can be driven to move upwards in the upward moving process of the lower clamping plate; the upper clamping plate and the lower clamping plate are matched with each other until the top end of the pipe fitting is driven to be attached to the clamping groove in the bottom end of the upper clamping plate, so that the pipe fitting can be clamped through mutual matching of the upper clamping plate and the lower clamping plate, the pipe fitting is fixed, workers only need to place the pipe fitting in the supporting seat in the process, redundant process operation is not needed, and convenience and practicability are achieved.

The application discloses a kind of wind generating set electromagnetic brake splines dismounting device and dismounting method, for dismounting spline;The dismounting device includes two thrust blocks, two sliders, two fixed blocks and two adjusting screws;Two thrust blocks are respectively arranged in the opposite sides of the top of yaw motor end cover of wind generating set, and are respectively located in the opposite sides of spline;The side of each thrust block towards spline is formed with a limit structure, and the top surface of the side of thrust block towards spline is wedge surface;The side of each thrust block away from spline is formed with mounting groove;Two sliders are respectively installed in the mounting groove of two thrust blocks;Two fixed blocks are detachably installed in the opposite sides of the top of yaw motor end cover, and are respectively located outside two sliders;Two adjusting screws are respectively connected with two fixed blocks in one-to-one correspondence in horizontal direction by screw thread.This application can effectively solve the problems of limited spline dismounting space, poor centering effect, easy damage to components, insufficient universality and the like.

The present application relates to the technical field of vehicle braking, and provides a hand brake valve operating device and a hand brake valve. The operating device comprises a thrust block and a locking block, the locking block is provided with a sliding surface for the movement of the thrust block, a side wall protruding from the sliding surface, and a locking groove at the front end of the sliding surface for the falling of the thrust block; a crossbar is movably arranged on the side wall and at the front end of the locking groove; a false locking prevention mechanism comprises a false locking prevention pin movably connected to the crossbar, and when the thrust block is at a non-parking position, the false locking prevention pin blocks the edge of the locking groove; when the thrust block moves along the sliding surface to the parking position, the crossbar is pushed to drive the false locking prevention pin to leave a falling path for the thrust block to fall into the locking groove. The operating device and the hand brake valve of the present application can effectively avoid the occurrence of the "false locking" problem during parking braking through the false locking prevention mechanism, and improve the stability and safety of parking braking.

The utility model discloses a novel marine expansion joint fixing support which comprises a supporting part and a positioning part, the supporting part is detachably connected with the positioning part, the supporting part is fixedly connected with a ship body structure, and the positioning part comprises a fixing part thrust plate, an arc web plate and a fixing part supporting plate. One side surface in the thickness direction of the fixed part supporting plate is vertically and fixedly connected with one side surface in the length direction of the fixed part thrust plate; one side surface, far away from the fixed part supporting plate, of the fixed part thrust plate is detachably connected with the supporting part; the arc-shaped web is arranged on the upper end face of the fixing part supporting plate, the outer convex face of the arc-shaped web is fixedly connected with the fixing part supporting plate, and the inner concave face of the arc-shaped web is tightly attached to the outer side wall of the pipeline. According to the novel expansion joint fixing support for the ship, due to the fact that the arc-shaped web is used, even if a welding seam is damaged, the pipe wall cannot be substantially damaged, and later maintenance is facilitated; meanwhile, a bolt hole of one thrust block is a kidney-shaped hole, so that the pipe is allowed to have certain displacement in the vertical direction when being bent.

A retaining device for mounting a slide rail to a server rack between front and rear ends of the server rack includes a rear support unit connected with the rear end, and a front support unit connected with the slide rail. The rear support unit includes a rear support rail and a biasing member. The front support unit includes a front support rail telescopically disposed on the rear support rail, and a front bracket connectable with the front end and the slide rail. The front support rail has a thrust block abutting against the biasing member. The front support rail is moved rearwardly to move the slide rail and the front bracket toward the rear support rail so as to vary a distance between the front bracket and the rear end, and the thrust block compresses the biasing member to tightly connect the front bracket with the front end.

The invention belongs to the technical field of heavy truck cab damping, and particularly discloses a heavy truck cab damping system and method, a terminal and a medium. The thrust block is arranged on the supporting sliding rod in a sleeving manner and can axially slide relative to the supporting sliding rod; the mass block group comprises a plurality of annular mass blocks which are coaxially arranged on the supporting sliding rod in a sleeving manner and are positioned between the two thrust blocks; and the spring is arranged between the mass block group and the thrust block, so that the mass block group is clamped in the axial direction. A mass-spring resonance system is formed by combining the supporting sliding rods, the thrust blocks, the springs and the mass block sets, vibration energy can be effectively absorbed and counteracted when low-frequency vibration occurs in the cab, and shaking is remarkably weakened.

This utility model relates to the field of scroll compressor technology, and more particularly to an assembly structure and a scroll compressor. The assembly structure includes a crankshaft; a moving scroll plate with a shaft hole at its bottom, into which the end of the crankshaft is inserted, and a friction coating to reduce friction is provided between the crankshaft and the shaft hole; a frame through which the crankshaft passes, and the friction coating is provided at the contact points between the crankshaft and the frame; and a lower support body through which the crankshaft passes, and a thrust block is mounted on the crankshaft, with the friction coating also provided at the contact points between the crankshaft, the thrust block, and the lower support body. This assembly structure and the scroll compressor solve the problem of high bearing costs in existing scroll compressors.

The invention relates to the technical field of marine parts, and discloses a flexible and convenient upper rudder bearing and upper rudder bearing machining equipment, the flexible and convenient upper rudder bearing comprises a rudder bearing shell, a plurality of evenly distributed through holes are formed in the upper portion of the rudder bearing shell, and a plurality of thrust blocks are fixedly installed on the periphery of the rudder bearing shell; the rudder bearing frame is arranged above the rudder bearing shell; the radial bearing is arranged on the inner wall of the rudder bearing shell, and a rudderstock is sleeved with the radial bearing during installation; the axial bearing is arranged between the rudder bearing shell and the rudder bearing frame; the framework oil seal is arranged at the bottom of the joint of the radial bearing and the rudder bearing shell; and the protective sleeve is installed on the outer side of the rudder bearing shell, a plurality of blind holes are formed in the top of the protective sleeve, and the through holes are used in cooperation with the blind holes. By means of the prefabrication mode, the upper rudder bearing has a complete assembly state when being delivered to a shipyard, the shipyard only needs to connect and fix the rudder bearing shell and the rudder bearing frame through common bolts, and the installation period of a rudder system is greatly shortened.

The invention relates to an automatic vertical drilling tool complete machine ground test system, which comprises a suspension clamp assembly, a driving assembly, a pushing force measuring platform and a hole drift angle debugging assembly, and is characterized in that the suspension clamp assembly is fixedly arranged and is used for clamping a drilling tool; the pushing force measuring platform is arranged below the suspension clamp assembly, is connected with the suspension clamp assembly through a suspension piece, and is used for measuring the thrust of a plurality of thrust blocks on the drilling tool; the hole drift angle adjusting assembly is installed below the pushing force measuring platform, the driving assembly is installed on the hole drift angle adjusting assembly and used for driving the drilling tool to rotate around the axial direction of the drilling tool, and the hole drift angle adjusting assembly is used for adjusting the driving assembly and the drilling tool to swing on the vertical face so as to adjust the hole drift angle. The testing system has the advantages that the structure is compact, the testing system can comprehensively verify the overall working performance of the automatic vertical drilling tool, data in the experimental process can be displayed and recorded, and experimental support is provided for reliable application, optimization and upgrading of the automatic vertical drilling tool.

The invention discloses an axial loading buffer device for a high-speed bearing test bed and a use method of the axial loading buffer device, and relates to the technical field of loading buffer devices for high-speed bearing test beds. An axial loading buffer device for a high-speed bearing test bed comprises a thrust block, an output end pressing plate, a thrust sleeve, a sleeve, a piston rod, an input end gland and a spring. The application method comprises the following steps: placing the electric cylinder at the rear end of the piston rod, and fixing a bearing test piece at the front end of the thrust block; the electric cylinder is started, the transmission rod of the electric cylinder pushes the piston rod to move forwards, and the thrust sleeve drives the thrust block to repeatedly load the bearing test piece under the elastic force action of the spring until loading is completed. The axial loading buffer device for the high-speed bearing test bed and the using method of the axial loading buffer device can be obtained.

A device for large ring shape correction, comprising a ring, a center base, a supporting roller mechanism, a measuring centering mechanism, a clamping limiting mechanism and a thrust block mechanism, a plurality of supporting roller mechanisms are evenly arranged on the circumference of the ring for driving the ring to rotate; a plurality of measuring centering mechanisms are evenly arranged on the circumference of the ring for positioning the ring center position, measuring the ring roundness error and the end face unevenness; a plurality of clamping limiting mechanisms are evenly arranged on the circumference of the ring for limiting the movement of the ring contact position; a plurality of thrust block mechanisms are evenly arranged on the circumference of the ring, one end of the thrust block mechanism is connected with the center base, the other end is in contact with the ring, the thrust block mechanism works on the ring along the radial outward to change the ring curvature to realize the roundness correction, works on the ring along the axial upward to change the ring end face curvature to realize the flatness and column correction. The present application can comprehensively correct the ring roundness, flatness and cylindricity, and has strong versatility for many shape error categories.

The utility model belongs to the technical field of sand core casting equipment, and particularly relates to a sand core drilling tool for casting an ejector rod hole, which comprises a base, an ejector rod hole drilling device and a sand core drilling device, a plurality of limiting blocks are distributed on the upper end face of the mould, and the limiting blocks are matched with one another to form a sand core placing position; the drilling mechanisms are arranged along the horizontal direction and are respectively aligned with the corresponding processing surfaces of the sand core; the sliding mechanism is used for bearing the mould and comprises sliding rails and moving parts capable of moving back and forth along the sliding rails, and limiting parts are arranged on the sliding rails and abut against the inner sides of the moving parts to limit transverse deviation of the sand cores on the mould; wherein a thrust block is arranged in the advancing direction of the sliding mechanism and is suitable for limiting the maximum stroke of the sliding mechanism so as to limit the hole depth of the sand core and prevent the drilling depth from exceeding the thickness of the side wall of the sand core, so that a drill bit is prevented from punching through the side wall of the sand core.

This utility model relates to the field of jig technology, specifically to a folding spoon jig, including a spoon and a clamping mechanism for holding the spoon. A jig fixing plate is movably arranged at the bottom of the clamping mechanism, and several cylinders a are fixed on the jig fixing plate. The output end of the cylinders a is equipped with a thrust block for cooperating with the clamping mechanism to bend the spoon. The clamping mechanism includes a jig base plate, a sliding frame, a clamping component, a lifting frame, and a cylinder b. This folding spoon jig achieves flexible adaptation of clamping spacing and quantity through the freely adjustable clamping component on the sliding frame. At the same time, the buffer module absorbs the impact force through the elastic deformation of the buffer spring, and the buffer spring compression stroke is adjusted by the internal hex nut to customize the buffering performance. Finally, under the synergistic action of the lifting frame driven by cylinder b and the thrust block linked by cylinder a, a highly flexible, impact-resistant, and customizable spoon folding effect is achieved.

The invention relates to the technical field of construction measurement and control, in particular to a pipeline deviation rectification control system for pipe jacking construction, which comprises a posture calibration module, a track recognition module, a variable analysis module, a thrust distribution module and a partition execution module. According to the method, the circumferential thrust difference and the attitude angle change direction are analyzed, attitude correction and path offset data are combined, a linkage judgment mechanism between the path and the attitude is constructed, the dominant deviation type in the propulsion process is recognized, the response direction is dynamically adjusted and controlled, and the propulsion variable matching relation is optimized; thrust output and speed data are utilized to establish a resistance distribution diagram, the thrust output proportion is accurately adjusted after the resistance concentration trend is recognized, thrust continuity and output trend consistency are adopted to merge and control sections, linkage regulation and control and partition updating of thrust blocks are achieved, posture adjustment, path deviation correction and thrust distribution form a unified coordination relation, and the thrust distribution accuracy is improved. And the direction control precision and the response synchronism in the pipeline propelling process are enhanced.

The utility model relates to a cooling system of a vertical thrust sliding bearing. The cooling system comprises a base, a thrust head and an axial thrust pad located between the base and the thrust head. The surface of the base is provided with an oil groove which is concavely arranged, and the oil groove extends towards the center of the base and penetrates through the inner wall of the base; one end, close to the base, of the thrust block extends outwards to form a step part; the guide bearing seat is of an annular structure; according to the cooling system disclosed by the utility model, efficient cooling, uniform lubrication and remarkable improvement of structural stability are realized through an innovative structural design and an optimized lubricating oil flowing path; lubricating oil enters the oil-water cooler from the working areas of the axial thrust pad and the guide bearing pad and enters the working areas again after being cooled, a first circulating channel and a second circulating channel of the lubricating oil are formed, efficient cyclic utilization of the lubricating oil is facilitated, and the working temperature of the bearing can be remarkably reduced; and the performance reduction or damage of the bearing caused by overheating is also avoided.

The light large-span wave compensation type seaborne lightering device comprises a mechanical body, a hydraulic system and an electric control system, and the mechanical body comprises a container type base, an anti-swing base assembly, a rotary tower body assembly, an arm frame assembly, a working basket assembly, a winding and unwinding winch assembly and a variable-amplitude oil cylinder; the container type base is connected with a ship body base, and the anti-swing base assembly is connected with the container type base through a fastener and a thrust block. The slewing tower body assembly is connected with the anti-swing base assembly through a slewing support; the arm support assembly is connected with the slewing tower body assembly through a variable-amplitude oil cylinder and a pin shaft assembly; the working basket assembly is connected with the arm support assembly through a variable-amplitude oil cylinder and a pin shaft assembly; the winding and unwinding winch assembly is installed at the lower end of the boom assembly. The hydraulic system is connected with the anti-swing base assembly, the arm frame assembly, the rotary tower body assembly, the working basket assembly, the winding and unwinding winch assembly and the variable-amplitude oil cylinder. The electric control system is connected with the hydraulic system. According to the invention, the maritime lightering device has relatively strong environment self-adaptive capability and relatively high reliability.

An axially limiting drum-tooth coupling and its installation and adjustment method are disclosed. The drum-tooth coupling includes an axial limiting assembly, comprising an active end limiting mechanism disposed on both sides of the transmission component and capable of elastically abutting against the active end external gear sleeve, and a driven end limiting mechanism capable of rigidly abutting against the driven end external gear sleeve. The active end limiting mechanism includes an active end thrust block axially slidably disposed within a cavity of the transmission component, and an elastic element providing axial elastic support for the active end thrust block. This coupling effectively limits the axial displacement of the motor shaft through the axial limiting assembly, while retaining the original high torque transmission capacity and deviation compensation characteristics of the drum-tooth coupling. The installation and adjustment method of this coupling is also simple and efficient, enabling quick and accurate installation and axial limiting adjustment, greatly improving installation efficiency and reliability.

The utility model belongs to the technical field of constructional engineering, and relates to a drill bit expanding device for a casing protection wall rotary excavating drilling pile, which is an expanding drill bit applied to a casing protection wall rotary excavating drilling pile process of pile foundation engineering, and the diameter of a hole-forming pile and smooth lowering of a casing pipe are guaranteed through the expanding device additionally arranged on the rotary excavating drill bit. According to the telescopic expanding drilling tool, a conventional rotary excavating double-bottom drill bit is modified, the telescopic expanding drilling tool has the expanding capacity by additionally installing components and optimizing a mechanical structure, and the arranged thrust block can achieve the expanding and closing functions of the telescopic expanding drilling tool according to the drilling state; the efficiency of casing running while drilling and the stability of casing running can be improved in an easily collapsed loose filling soil (stone) layer, and meanwhile, the pile diameter of a non-casing section subjected to reaming by adopting the device is kept consistent with the pile diameter of a casing section, so that a steel retaining casing with the same size can be prepared according to the requirement of the designed pile diameter; and the drilling cost can be effectively controlled, and the cost of over-pouring concrete in a sleeve section is saved.

A mechanism for quick character changing in sand molds is disclosed. The mold is mounted on the upper part of the upper mold base. The mechanism includes a stripper plate, a thrust block, a character striking rod, and a character quick-change key. The stripper plate is located below the upper mold base and is connected to the upper mold base via guide pillars. The thrust block is fixed to the upper part of the stripper plate, and the character striking rod is also fixed to the upper part of the stripper plate. The lower part of the mold has an ejection hole for the character striking rod to enter. The character quick-change key is embedded in the upper part of the mold, and its embedded position matches the upper end of the ejection hole. The thrust block limits the distance between the stripper plate and the upper mold base, so that when the stripper plate moves to its limit position, the upper end of the character striking rod is lower than the character quick-change key. The positions of the character striking rod and the character quick-change key are controlled by a detachable thrust block. During production, the thrust block is installed to limit the mold closing distance, and the top of the rod does not contact the character. When character replacement is required, the thrust block is removed, and the rod ejects the character after mold closing. This mechanism has high work efficiency, can be repeatedly implemented, and is suitable for quick-change requirements in production lines.