39results about How to "Easy on-site maintenance" patented technology

The invention relates to a tool for manually dismounting and mounting a tire in vehicle maintenance detection equipment, and particularly relates to a quick device for manually dismounting and mounting a tire and a use method of the quick device. The device mainly comprises an upright column, a supporting shaft and a three-jaw chuck; a tire pressing bar is arranged on the upright column, a tire pressing spade is arranged on the tire pressing bar, a cam is arranged on the upright column, and an extension spring is arranged between the upright column and one end of the cam; a clamping block is arranged on the upright column, one end of the clamping block is positioned on the protruded face of the cam, and the clamping head end of the clamping block is positioned at the inner side of the upright column on which a platform is arranged; and a cone pulley is arranged on the supporting shaft; a pedal is arranged on the upright column, and a rope is connected between the pedal and one end of the cam; and the connection between the upright column and the tire pressing bar, between the tire pressing bar and the tire pressing spade, between the upright column and the cam and between the upright column and the clamping block is achieved by movable shafts. The device can meet the requirements of tire dismounting, mounting and maintenance of various vehicles such as motorcycles, cars and electric vehicles, and the problems that the existing manual tire changers are troublesome in mounting and dismounting and time-wasting, the power source tire changers can not work without a power source, and the like are solved.

A quick-detachable structure 100 is used for detachably connected to a rotor assembly 20 to a fuselage 10 and is characterized in that, when the quick-detachable structure 100 connects the rotor assembly 20 to hte fuselage 10, the rotor assembly 20 is electrically connected to the fuselage 10 through the quick-detachable structure 100. A pluraltiy of rotor assemblies 20 which are correspondingly connected to the quick-detachable structures 100 can be switched mutually. The invention also relates to an multi-rotor unmanned aerial vehicle 100 and 300, and an assemlby, and the rotor assembly.

The invention discloses a locking self-sealing dry quick joint. The locking self-sealing dry quick joint comprises a dry quick male joint and a dry quick female joint; the dry quick male joint comprises a male joint shell, a male joint valve base, a guide spring bushing, a spring, a slide valve element and a spiral guide groove; and the dry quick female joint comprises a female joint shell, a valve element support base, a fixed valve element, a slide valve base, a guide bushing, a spring bushing, a spring, a front end cover, a cam and an operation hand wheel. The locking self-sealing dry quickjoint realizes connection and disconnection through the female joint axially rotated in and out of the male joint, so that the medium leakage quantity in the connection and disconnection process during fluid conveying is reduced, and the purposes of environmental protection and conservation are achieved; and the locking self-sealing dry quick joint reduces internal friction of a mechanical structure through the cam and the spiral guide groove structure, is lower in operation driving force, saves both time and cost, optimally designs the flowing speed, and guarantees lower flow and pressure loss.

The embodiment of the present invention discloses a clamping pliers device which comprises an upper pliers piece, a lower pliers piece and a central pliers piece installed between the upper pliers piece and lower pliers piece, wherein the upper pliers piece and the lower pliers piece are configured into a driller joint which rotates in the first direction, and the central pliers piece is configured into another driller joint which rotates on a second direction opposite to the first direction. Or, the upper pliers piece and the lower pliers piece are configured to fix one driller joint, and the central pliers piece is configured to rotate another driller joint. Or, the upper pliers piece and the lower pliers piece are configured to rotate the drill joint, and the central pliers piece is configured to fix another driller joint. The invention further discloses a method for using the clamping pliers device.

The invention discloses an intelligent variable-frequency hydro-electric actuator capable of achieving 60-millimeter straight-stroke power failure resetting. The valve actuator comprises an outer barrel, a support and a controller; a top cover is arranged at the top end of the outer barrel, the support is fixed to the bottom of the outer barrel, an inner cylinder barrel is arranged in the outer barrel, electromagnetic pumps and electromagnetic valves are arranged in the inner cylinder barrel, and an adjusting cavity is reserved between the outer barrel and the inner cylinder barrel; a prepressing elastic device is arranged in the adjusting cavity in the mode of surrounding the inner cylinder barrel, a universal coupler used for switching on and off a hydraulic valve is connected to the bottom of the inner cylinder barrel through a coupling nut, the prepressing elastic device and the inner cylinder barrel synchronously and vertically move, and switching-off operation and switching-on operation of the hydraulic valve are controlled through vertical motion of the inner cylinder barrel. According to the actuator, generation of potential safety hazards in the existing maintaining process is completely eradicated by adopting the prepressing elastic device, the output stoke of the actuator is long, multi-pump pressure supplying is achieved, the stoke requirement is guaranteed, and use is safe and reliable; in addition, when faults occur, the inner cylinder barrel can be gradually reset under the resilience of the prepressing spring, and then the valve is switched off.

The invention discloses a station track double-sleeper tamping device, which comprises a box body, a vibration shaft, an inner clamping oil cylinder, an outer clamping oil cylinder, an inner pickaxe arm, an outer pickaxe arm, an inner tamping pickaxe, an outer tamping pickaxe, an air cylinder, stop blocks, a guide post, an outer support arm, an oil tank assembly and an inner support arm, wherein the box body is at least formed by a middle body, a cross beam, an end plate, an inner support lug boss, an outer support lug boss and a stop baffle plate through welding, the distance from the center of a pin hole of the outer pickaxe arm arranged on the cross beam of the box body to the center line of the box body equals 600mm+ / -20mm, the outer support arm and the oil tank assembly comprise an outer support arm, two oil tanks and a flywheel cover, the inner support arm comprises an inner support arm body and a flywheel cover, the stop blocks are arranged between the front end of a piston rod of the outer clamping oil cylinder and the cylinder cover of the oil cylinder, the stop blocks comprise a fixed stop block and a turnable stop block, through using different numbers of stop blocks, the downward inserting positions and clamping strokes of the outer side stamping pickaxe are regulated, and the operation requirements of different sleeper spaces are met. The station track double-sleeper tamping device has the advantages that the structure is reasonable, the station track operation is met, and the main track operation is also met.

The invention relates to a CAN bus-based medical X-ray high voltage generator control system, which comprises a console MCU module, a high voltage generator and a bulb tube connected in sequence, wherein the high voltage generator comprises a power interface module, a rotary anode driving module, a high voltage loop control module, a large-small focal filament power module, an AEC shooting control module, an IBS perspective control module, a high voltage inverter and a transformer; the console MCU module, the power interface module, the rotary anode driving module, the high voltage loop control module, the large-small focal filament power module, the AEC shooting control module and the IBS perspective control module are mutually connected via the CAN bus; and the high voltage inverter and the transformer are respectively connected with the high voltage loop control module and the bulb tube. Compared with the prior art, the system has the advantages of flexibility, reliability, low cost, good system performance and the like.

The invention discloses a high-temperature and high-pressure special adjusting valve. The high-temperature and high-pressure special adjusting valve comprises a valve body, a valve cover, a valve seat, a valve cage, a valve plug and a valve rod. The valve cover is arranged above the valve body. An inner space is formed between the valve cover and the valve body, and the valve seat is arranged at the lower portion of the inner space. The valve cage is arranged between the valve seat and the valve cover and comprises an upper valve cage body and a lower valve cage body which are arranged from top to bottom. An upper sealing piece is arranged between the upper valve cage body and the lower valve cage body. The valve plug is arranged in the valve cage. The valve plug is arranged above the valve seat, and a lower sealing piece is arranged between the valve plug and the valve seat. The valve rod is arranged in the valve plug. The valve plug and the valve rod are connected through a front positioning anti-loosening thread. The upper portion of the valve rod penetrates the center of the valve cover, graphite filler is arranged between the valve rod and the valve deck, and a filler gland is further arranged at the upper portion of the valve cover. According to the high-temperature and high-pressure special adjusting valve, the high-temperature sealing performance, high-pressure bearing, reliability and universality of the valve can be effectively improved, and the high-temperature and high-pressure special adjusting valve can be widely applied to various automatic high-temperature and high-pressure adjusting occasions.

The invention discloses a water-cooled cable convenient in maintenance, comprising a conductive inner cable, a cable sleeve, a cable end socket, a cable core rod, a cable water nozzle, a cable patch panel, a fixing nut and a gasket component; the conductive cable is arranged in the cable sleeve, the length of the conductive cable is smaller than the length of the cable sleeve, the two ends of the conductive cable retracts into the cable sleeve and are connected with an interior end of the cable core rod, the cable end socket is in a sleeve structure, a via hole which the cable core rod is inserted into and extends out of is formed in the center of the cable end socket, and the exterior section of the cable core rod penetrates through the via hole to be locked on the exterior end of the cable end socket by the fixing nut and the gasket component; part of the cable end socket, extending out of the cable sleeve, is provided with a water injection hole communicated with the via hole, and the cable water nozzle is arranged at the position of the water injection hole; the cable end socket is fixedly connected with the cable patch panel; and the gasket component is arranged between the fixing nut and the cable end socket. The water-cooled cable convenient in maintenance enables the maintenance personnel to replace specific parts of the water-cooled cable conveniently, so that a steelworker can maintain equipment on site conveniently, and time and labor are saved.

The invention discloses rapid repair polymer mortar which is prepared from the following raw materials in parts by weight: 70-80 parts of sand, 12-15 parts of cement, 5-8 parts of coal ash, 5-8 parts of mineral powder, 2-5 parts of emulsion powder, 0.1-1 part of cellulose ether, 0.5-1 part of low molecular weight epoxy resin, 0.5-1 part of medium molecular weight epoxy resin, 1-5 parts of glycerol ester of rosin and 2-4 parts of a polyurethane thickener. Besides excellent performances of water-retention rate, shrinking percentage, compressive strength, layering degree and the like, the rapid repair polymer mortar disclosed by the invention also has a performance of rapid agglomeration, so that when the rapid repair polymer mortar is used for engineering repair, the rapid repair polymer mortar not only effectively avoids phenomena such as cracks and hollow protuberances at the repaired parts, but also can be effectively and widely applied to pavement pulverization and suncrack repair of high and cold and high-temperature regions with large temperature difference and complicated climate.

The invention relates to a novel tool for reducing a gas residual rate of an SF6 steel cylinder. The novel tool comprises a vertical type gas cylinder heating small handcart, an electric control cabinet arranged on the heating small handcart, and upper, middle and lower sets of heaters, wherein each heater is composed of opening and closing type heating sheets; a heat insulation layer is arranged on the outer surface of each heating sheet and a temperature control probe is mounted in the upper heating sheet; a digital readout temperature controller is arranged in the electric control cabinet and is used for controlling a temperature setting range to 10-35 DEG C; a protection switch with a safety protection effect is arranged on the right side face of the upper heating sheet. The novel tool for reducing the gas residual rate of the SF6 steel cylinder is small in fund investment, simple in structure and convenient to use, and can be applied to gas filling and gas supplementation work of sulfur hexafluoride equipment of a transformer substation of a power supply company in cold weather. Therefore, a heating device of a sulfur hexafluoride gas cylinder has the advantages of being economic, practical, stable, reliable, and the like and has very strong actual application values and popularization values. The novel tool for reducing the gas residual rate of the SF6 steel cylinder is mobile and is low in cost, convenient to use and convenient to carry; the novel tool is easy to fill rapidly and convenient for field overhauling and maintenance.

The invention discloses a novel vacuum drying tunnel furnace body structure and a tunnel type vacuum drying system. The novel vacuum drying tunnel furnace body structure comprises a furnace body, a roller conveying mechanism and a driving mechanism, wherein the furnace body is provided with a drying cavity; the roller conveying mechanism is used for conveying articles in the drying cavity, and theroller conveying mechanism is rotatably mounted on the furnace body; and the driving mechanism is used for driving the roller conveying mechanism to rotate, and the driving mechanism is arranged on the outer side wall of the furnace body. The novel vacuum drying tunnel furnace body structure has the following advantages that mounting is convenient, and mounting personnel do not need to enter thedrying cavity for mounting; on-site maintenance is convenient, when the driving mechanism goes wrong, maintenance personnel can maintain and replace parts of the driving mechanism on the outer side wall of the furnace body without entering the drying cavity, so that the operation of cleaning the articles in the drying cavity before maintenance is avoided, and manpower and material resources are saved; and metal dust generated by abrasion during operation of the driving mechanism cannot pollute the articles in the drying cavity.

The invention discloses an energy saving blast furnace billet steel shearing machine, and relates to the field of iron and steel smelting. The shearing machine comprises a hoisting beam and a shearing machine principal part arranged on the hoisting beam, the shearing machine principal part comprises a machine frame, a shearing mechanism, a travelling mechanism and a controller; wherein the machine frame comprises a suspension part and a shearing part, the suspension part is fixedly connected with the shearing part; the travelling mechanism is arranged on the suspension part, the suspension part is arranged on the hoisting beam though the travelling mechanism. The technical scheme because of adopting the suspension type structural design for the hoisting beam does not require making cement foundation below the billet steel track, the mounting time of a whole mechanism is shortened, the cost is saved, meanwhile on-site maintenance of the equipment production is facilitated, online replacements are achieved, and the time and the cost are saved.

The invention discloses a movable maintenance vehicle for a fuel injection pump. The movable maintenance vehicle comprises the maintenance vehicle body, a pair of armrests, a plurality of travelling wheels, and a plurality of illuminating lamps, wherein the maintenance vehicle body comprises four vertical columns and three partition plates; the partition plates are respectively connected with four vertical columns from the upper part to the lower part, so that the maintenance vehicle body is divided into top layer storage space, middle layer storage space and bottom layer storage space; the pair of armrests is respectively and fixedly arranged on two sides of the maintenance vehicle body; the travelling wheels are respectively arranged at bottoms of the vertical columns; the illuminating lamps are respectively arranged at tops of the four vertical columns; at least one maintenance tool kit is arranged in the top layer storage space of the maintenance vehicle body; at least one tool slot rack is arranged in the middle layer storage space of the maintenance vehicle body; a plurality of tool slots are formed in the tool slot rack; an instrument fixing box is arranged in the middle layer storage space of the maintenance vehicle body; a plurality of instrument embedding space is arranged in the instrument fixing box. The movable maintenance vehicle can be used for placing the fuel injection pump maintenance tool kit and detecting instruments, and can also be used for placing the dismounted fuel injection pump, so as to further check and maintain the fuel injection pump.

The invention relates to a pump unit. The pump unit comprises a pump body, a stator shield sleeve, a motor shell and a junction box shell. The stator shield sleeve is arranged above the pump body, theupper portion of the stator shield sleeve is a cylindrical part with an opening in the lower end, and the bottom of the cylindrical part is outwards provided with a flanging part placed on the spigotface of the pump body in the radial direction. The motor shell is in a cylindrical shape with an opening in the lower end, the stator shield sleeve is covered with the motor shell, and the stator shield sleeve is arranged on the upper end face of the pump body through a boss on the outer side of the side wall of the stator shield sleeve. The junction box shell is in a cylindrical shape with an opening in the lower end, the junction box shell covers the motor shell, and the function box shell is connected with the motor shell through bolts. The pump unit is simple and compact in structure, high in space utilization rate, reliable in connection between components and convenient to assemble. The junction box shell wraps the motor shell, so that the motor shell does not need paint spraying, the surface does not need to be subjected to shot blasting treatment, production procedures are reduced, the raw material cost is saved, and the production efficiency is improved.

The invention discloses a multifunctional entertainment home theater system, and relates to the technical field of home theaters, in particular to a wall body, an equipment heat dissipation cabinet assembly and an automatic disassembly and assembly loudspeaker box assembly, a display screen is fixed to the left side of the inner wall of the wall body, and the equipment heat dissipation cabinet assembly is arranged below the display screen; the automatic disassembly and assembly loudspeaker box assembly is fixed to the top of the right side of the inner wall of the wall body, and the steel wire is connected with the loudspeaker box body through the threaded column. According to the multifunctional entertainment home theater system, the power amplifier, the audio processor and the decoder can be lifted through the magnetic rolling balls, so that the bottoms are exposed, airflow flows conveniently to take away heat to achieve heat dissipation, the magnetic rolling balls are matched with the clamping convex blocks to be clamped and attracted with the clamping grooves, equipment can be stably placed in the cabinet body, and the equipment is prevented from shaking; and the sound box body can automatically complete line plugging and lifting without climbing by personnel for dismounting, so that later maintenance and repair are facilitated, and the operation is convenient and the personnel can use the sound box conveniently.

The invention relates to the field of medical appliances, and provides a chip removal device of a medical crane tower and the medical crane tower. The medical crane tower comprises a lifting post and a supply post slidingly sheathed on the lifting post. The chip removal device comprises a sliding component fixedly mounted on the supply post and is in sliding fit to the lifting post, wherein a chip removal chute is formed on the contact surface of the sliding component and the lifting post. The chip removal device provided by the invention automatically removes the chips generated due to friction force during the lifting process of the crane tower, so as to prevent the surface of the lifting device from being scratched by the chips, prolong the service life of the crane tower, and keep theappearance of the crane tower clean and tidy.

The invention provides an alternating current asynchronous gearless speed change tractor. The tractor comprises a three-phase asynchronous motor, and a traction wheel fixed to an output shaft of the three-phase asynchronous motor. The three-phase asynchronous motor is further provided with an encoder, and a brake for having a braking effect on a traction wheel shaft. The three-phase asynchronous motor comprises a stator shell, a stator arranged in the stator shell, and a rotor arranged on an outer ring of the output shaft. A front end cover and a rear end cover are arranged at the two ends ofthe stator shell correspondingly. The brake and the encoder are installed on the rear end cover. According to the alternating current asynchronous gearless speed change tractor, a stator assembly is composed of a stator iron core and an enameled copper wire, a cast-aluminum rotor is adopted as the rotor, high temperature resistance is achieved, the structure is simple, assembling is convenient, incomparison with permanent magnet steel, the price is lower, and environmental friendliness is achieved. Site installing and maintaining are convenient.

The invention relates to the field of rubber, and specifically relates to technology for processing a pre-sulphurized butyl rubber plate. The technology comprises the following steps: a first step, plastication: a butyl rubber raw material 1675N and a butyl rubber raw material 268 are placed in an open mill for plastication; a second step, the butyl rubber raw material which is plasticated in thefirst step, active magnesium oxide, stearic acid, chlorinated paraffin, polyethylene wax, an anti-aging agent RD, an anti-aging agent WB-16, carbon black 770, carbon black 660, talcum powder, barium sulfate, aromatic hydrocarbon oil, paraffin oil 300#, transformer oil, benzofuran, and zinc oxide are placed together for kneading; a step 3, the raw materials in the step 2, sulphur, a promoter DM, apromoter ZDC, and a promoter NA-22 are placed in an open mill together for open mill; a step 4, a rubber sheet after open mill is placed in a calendar, and is compacted into the butyl rubber plate bya belt conveyer; a step 5, the butyl rubber plate after moulding by the calender and the belt conveyer is placed in a steam vulcanizer for vulcanization. Finally, the pre-sulphurized butyl rubber plate has the advantages of high wear resistance, high corrosion prevention, and long usage life.

The invention provides a portable TMR terminal detection device and a detection method. The device comprises a box body, wherein a panel is arranged in the box body. A 485 Bluetooth module, an MODEM Bluetooth module, a MODEM module, a network Bluetooth module, an Ethernet module, a baud rate converter, a telephone switch and a battery are arranged between the panel and the bottom plate of the boxbody. The 485 Bluetooth module is connected with the baud rate converter. The baud rate converter is connected with the electric energy acquisition terminal. The MODEM Bluetooth module is connected with the MODEM module. The MODEM module is connected with the electric energy acquisition terminal through the telephone switch. The network Bluetooth module is connected with the electric energy acquisition terminal, and the baud rate converter and the MODEM module are both connected with the Bluetooth control module. According to the device, faults of an on-site electric energy collection terminalcan be conveniently eliminated, when fault points are positioned, troubleshooting can be carried out without disassembling the electric energy collection terminal, and the fault elimination efficiency is improved.

The invention belongs to the technical field of elevator equipment and relates to an ultra-thin servomotor for an elevator door motor. The ultra-thin servomotor for the elevator door motor solves the technical problems that the design is not reasonable enough and the like in the prior art and comprises a motor casing, wherein a stator is fixedly arranged in the motor casing, a rotary shaft is arranged in the stator in a penetrating manner, a rotor is fixedly arranged on the rotary shaft, one end of the rotary shaft extends out of the motor casing, the motor casing is flat, the stator is shaped like an annular disc body, and the rotor is shaped like a flat annular cover body and is sleeved on the stator. The ultra-thin servomotor has the advantages that 1, the structure is compact, the maintenance and repairing are convenient, the spatial arrangement is facilitated, the mounting of an elevator air-conditioner is facilitated, and the tall elevator car design is adopted; 2, the overall weight is light, the counterweight is reduced, the power of a tractor is reduced, and the operating cost of a driving system is reduced; 3, a magnetic coder is mounted, the connecting structure is simple, and the on-site maintenance is facilitated; and 4, a stator coil adopts the plastic encapsulation process, the gap between a stator winding and the motor casing is reduced, the heat dissipation and anticorrosion capabilities of the stator coil are reinforced.

The invention discloses an import-type hammering riser joint. The import-type hammering riser joint comprises an inner joint and an outer joint which are in up-down butt connection, the middle lower part of the inner joint is inserted into the outer joint and provided with a plurality of spiral teeth evenly distributed in the circumferential direction, a plurality of spiral tooth grooves are formed inside the outer joint, the inner joint and the outer joint are connected through the tooth grooves, a plurality of anti-falling-off blocks evenly distributed in the circumferential direction are fixed to the butt connection position of the inner joint and the outer joint, and the anti-falling-off blocks are embedded in the outer sides of the inner joint and the outer joint; and an O-shaped sealing ring is arranged at the lower end of the inner joint, and mounted between the inner joint and the outer joint in a clamped mode. According to the import-type hammering riser joint, torque equipment does not need to be utilized, self-centering import is achieved, construction on an offshore platform is very convenient, connection operation can be completed only through a simple hand-held tool,performance is stable, and the requirements of tripping-in hammering operation can be met.

The invention relates to the technical field of solution humidifying, and particularly discloses a solution humidifying fresh air handling unit based on a water loop heat pump heat source. The solution humidifying fresh air handling unit comprises a first air duct cavity, a second air duct cavity and a water loop heat pump, a first heat exchange coil, a first heat and humidity exchange unit and a first fan are arranged in the first air duct cavity; a second heat exchange coil, a second heat and humidity exchange unit and a second fan are arranged in the second air duct cavity; the first heat exchange coil and the second heat exchange coil respectively form a closed loop with the water loop heat pump; the first heat and humidity exchange unit is connected with a first liquid storage unit and a first plate heat exchanger, and the three form a closed loop; the second heat and humidity exchange unit is connected with a second liquid storage unit and a second plate heat exchanger, and the three form a closed loop; and the first plate heat exchanger and the second plate heat exchanger respectively form a closed loop with the water loop heat pump. Energy consumption of the unit can be reduced, heat exchange efficiency of the unit is improved, and installation and maintenance are facilitated.

The invention relates to a device and a method for connecting brake pipe systems of railway freight cars. The device is characterized by comprising two flanges, a sealing ring, a plurality of bolts, a plurality of nuts and a plurality of washers; the flanges are symmetrically arranged and are fixedly connected with each other by the bolts, the nuts and the washers, and a cylindrical cavity for accommodating the sealing ring is formed between the two flanges. The method includes sleeving the sealing ring at the ends of two brake pipes pressed by limiting check rings; adjusting the distance between the two limiting check rings to reserve a gap between the two brake pipes; respectively fastening the sealing ring and the limiting check rings into a sealing groove in one certain flange and limiting grooves; pressing axial width adjusting tables to axially and finely adjust the certain flange, enabling the distances from the ends of the two brake pipes to the longitudinal center line of the certain flange to be equal and fastening the other flange on the certain flange; inserting the bolts into bolt holes in the two fastened flanges, sleeving the washers at threaded rod ends of the bolts and fixing the nuts at the threaded rod ends of the bolts. The device and the method can be widely applied to brake pipe systems of railway freight cars.

The invention relates to the field of medical appliances, and provides a chip removal device of a medical crane tower and the medical crane tower. The medical crane tower comprises a lifting post and a supply post slidingly sheathed on the lifting post. The chip removal device comprises a sliding component fixedly mounted on the supply post and is in sliding fit to the lifting post, wherein a chip removal chute is formed on the contact surface of the sliding component and the lifting post. The chip removal device provided by the invention automatically removes the chips generated due to friction force during the lifting process of the crane tower, so as to prevent the surface of the lifting device from being scratched by the chips, prolong the service life of the crane tower, and keep theappearance of the crane tower clean and tidy.

The invention discloses an energy saving blast furnace billet steel shearing machine, and relates to the field of iron and steel smelting. The shearing machine comprises a hoisting beam and a shearing machine principal part arranged on the hoisting beam, the shearing machine principal part comprises a machine frame, a shearing mechanism, a travelling mechanism and a controller; wherein the machine frame comprises a suspension part and a shearing part, the suspension part is fixedly connected with the shearing part; the travelling mechanism is arranged on the suspension part, the suspension part is arranged on the hoisting beam though the travelling mechanism. The technical scheme because of adopting the suspension type structural design for the hoisting beam does not require making cement foundation below the billet steel track, the mounting time of a whole mechanism is shortened, the cost is saved, meanwhile on-site maintenance of the equipment production is facilitated, online replacements are achieved, and the time and the cost are saved.

The invention discloses polymer-modified repair mortar which is prepared from the following raw materials in parts by weight: 70-80 parts of sand, 12-18 parts of cement, 4-8 parts of coal ash, 5-8 parts of mineral powder, 1-5 parts of emulsion powder and 0.1-1 part of cellulose ether. By integrating the characteristics of flexibility of the cellulose ether and rigidity of cement and strength complementarity between the emulsion powder and the cellulose ether, adding coal ash and defining the particle sizes, adding the mineral powder and defining the specific surface area of the mineral powder and 28-day activity index and adding a raw material sand and defining the grain composition structure of the sand, the polymer-modified repair mortar disclosed by the invention has excellent performances of water-retaining rate, shrinking percentage, binding strength, compressive strength and the like, so that phenomena such as cracks and empty drums at the repair part are effectively avoided when the polymer-modified repair mortar is used for engineering repair.

The invention discloses a novel crawler tractor power transmission system which comprises a front transmission shaft, a shunt box, a belt transmission system, a continuously variable transmission, anaxle box, driving wheels and a power output device. The power input end of the front transmission shaft is connected with external power, and the power output end of the front transmission shaft is connected with the shunt box; the shunt box is provided with an input shaft, an upper output shaft and a lower output shaft, and the upper output shaft is connected with the continuously variable transmission through the belt transmission system; the continuously variable transmission is connected with the axle box; a half shaft of the axle box is connected with the driving wheels on the two sides;and a lower output shaft of the shunt box is connected with a power output device and transmits power to a working device suspended by a tractor. The transmission system is split into several small-size assemblies connected through the transmission shaft or the belt, the manufacturing difficulty of the transmission system is reduced, and the maintenance convenience is greatly improved.