296results about How to "Fit clearance is small" patented technology

The invention relates to a two-position three-way inverse proportion decompression electromagnetic valve for an AT (Automatic Transmission). The two-position three-way inverse proportion decompression electromagnetic valve is mainly formed by a main valve and a proportion electromagnet, wherein the main valve is formed by a valve body, a valve core which is positioned at the inner part of the valve body, a valve seat which is sleeved on the valve body and an inner valve core which is positioned at the inner part of the valve core and close to one side of the valve seat, and the proportion electromagnet is formed by a sliding bearing, a bearing seat, a pole shoe, an armature, a top rod, a stroke gasket, a stop iron, a spring seat, a regulating spring, a baffle plate, a regulating screw, a baffle plate cushion, a coil and a yoke iron. According to the two-position three-way inverse proportion decompression electromagnetic valve disclosed by the invention, the problems such as lower response speed, larger pressure fluctuation, short service life, large leakage rate and high manufacturing cost of an existing inverse proportion decompression electromagnetic valve for the AT are solved, and the two-position three-way inverse proportion decompression electromagnetic valve disclosed by the invention has the advantages of high response speed, small pressure fluctuation, long service life , small leakage rate, lower manufacturing cost and the like.

The invention relates to an air spring environment simulation fatigue testing machine, comprising a frame, a box body component, a mechanical transmission device, a counterweight device, a hoisting disc and a transmission shaft; the box body component consists of a box body and a box door with heat preservation function; the mechanical transmission device is arranged on the frame and is positioned outside the box body; the motor of the mechanical transmission device is connected with a rotation disc by a reducer; the swing shaft which is arranged on the rotation disc is connected with a sliding block which is arranged in the guide trough of a swing rod; one end of the swing rod is articulated on the supporter of the swing rod; the transmission shaft with a tray is arranged inside the box body; the transmission shaft passes through the box body and is articulated with the other end of the swing rod; the hoisting disc is connected inside the box body and is corresponding to the transmission shaft; the counterweight bracket of the counterweight device is fixed on the top inside the box body; two disc bodies are coaxially arranged on the counterweight bracket; two ends of the steel cables which are arranged in two disc body ring-shaped trough are respectively connected on the counterweight block and the transmission shaft. The air spring environment simulation fatigue testing machine has reasonable structure, does not affect the actuating unit and the transmission mechanism of the testing machine or the service life of the transmission mechanism, and has the advantages of convenient operation and low energy loss.

The invention discloses a louver turning-plate awning. The louver turning-plate awning comprises a cross beam frame body with a square shape, a plurality of louver turning-plates, a drainage mechanism, a plurality of stand columns, a transmission assembly and a driving device. The louver turning-plates are sequentially arranged in the cross beam frame body, and the louver turning-plates are transmitted through the transmission assembly, and the louver turning-plates can rotate synchronously through the driving device, so that the louver turning-plate awning has the advantages of neat opening and closing, simple structure and convenient control. The louver turning-plates are closely matched, so that the problem of water leakage in gaps between the louver turning-plates is solved; and in addition, due to the arrangement of the drainage mechanism, rainwater falling into the louver turning-plates can be discharged to the outside in rainy weather, and adverse situations of water seepage andside leakage cannot occur in the drainage process, so that a good rain-proof drainage effect is achieved.

The invention discloses a quick-blind-mating floating-type-mounted RF coaxial connector and a connecting method thereof. The RF coaxial connector comprises a socket and a plug. The socket comprises an inner conductor jack, an insulator, a socket outer conductor, a floating sleeve, a spring and a mounting panel. The plug comprises a plug outer conductor, an inner conductor inserting pin, an elastic collar and a mounting board. The elastic collar is connected with an engaging trough in an adapted engaging manner. The inner hole linear section of the socket is in insertion fit with the outer cycle linear segment of the plug. According to the RF coaxial connector, on the condition that the plug is inserted into the socket, two reference surfaces are superposed, thereby forming a theoretical zero clearance and ensuring continuity of capacitance. Furthermore a specific engagement structure is utilized, thereby eliminating radial clearance and preventing axial endplay clearance in a stationary state in insertion. Furthermore the quick-blind-mating floating-type-mounted RF coaxial connector and the connecting method have advantages of small size, compact structure, low reflection coefficient, low voltage standing wave, full-band linear voltage standing-wave ratio, excellent shielding efficiency, etc.

A second assembly positioning method is provided, which comprises the following steps: position a pair of connecting thread hole and coaxial positioning hole on a bearing base cap and two ends of the bearing base; insert a positioning and connecting bolt into the bearing base and the positioning hole of the bearing cap; a positioning polished rod section on the positioning and connecting bolt is respectively inserted into the positioning hole for the bearing base and bearing cap with precise clearance coordination, so as to limit the degree freedom at six directions. The positioning bolt is provided with a nut and a screw; a coaxial positioning polished rod section is arranged at the middle section of the screw; the diameter of the positioning polished rod exceeds that of the screw section. The mutual coordination of the positioning polished rod for the positioning and connecting bolt and the positioning hole of the bearing cap and bearing base realizes the positioning. When the invention is applied for the design of a camshaft bearing cap for engine, the coordination clearance between the camshaft and the bearing hole can be designed smaller, which helps reduce the abnormal noise of engine. In addition, because the positioning rod and bolt integrate into a whole, it needs not to assemble a positioning pin and a positioning sleeve, which realizes excellent economic performance, shorter assembly time and outstanding assembly complexity.

The invention discloses an electric spindle with a composite stator structure, which comprises an electric spindle shell sleeved on the outer surface of an electric-spindle composite stator, a plurality of sets of electric-spindle stator coils, a rotor shaft positioned in the rotation center of the electric spindle, as well as the electric-spindle composite stator which surrounds an electric-spindle rotor shaft and has a clearance with the electric-spindle rotor shaft, wherein the composite stator consists of a stator heat-conducting sleeve and a stator, and the rotor shaft consists of a spindle and a motor rotor arranged in the electric spindle. The inner circle surface of the electric spindle shell is closely combined with the outer circle surface of the electric-spindle composite stator; a channel on the outer circle surface of the electric-spindle composite stator and the inner circle surface of the electric spindle shell form a cooling channel; and a cooling medium takes away heat produced during high-speed rotation of the electric spindle through the cooling channel. The electric spindle has the advantages of simple structure and high heat dissipation efficiency.

The invention provides a sensor shell processing method, which specifically comprises the following steps: 1, a datum plane is polished on a blank; 2, a large plane is milled, a machined datum plane is established, and positioning holes A and B are drilled and milled; 3, the large plane is milled, the machined datum plane is established, holes are drilled, the positioning holes are milled, a groove and an a circular groove are milled, and chamfering is completed; 4 steps are milled by the processed datum plane and positioning holes A and B in step 3, the angle of a fixture is rotated to mill a slope and drill and bore an inclined hole; 5, the datum plane and the positioning holes are positioned to be unchanged, and a rotary processing center is provided with four shafts to complete the processing of surfaces and holes in a 90-degree direction, i.e. step surfaces are milled and holes are drilled and bored; and 6, the datum plane and the positioning holes are positioned to be unchanged, and the rotary processing center is provided with the four shafts to complete the drilling and tapping of surfaces and screw threads in a 0-degree direction. According to the sensor shell processing method disclosed by the invention, fit clearance is reduced, the position degree and the smooth finish are improved, and the precision and the sensitivity of a sensor are greatly improved.

The invention provides a connection joint of a concrete column and a steel beam, belongs to the technical field of construction engineering, and solves the technical problems of low strength, construction difficulty and the like of an existing connection joint of the concrete column and the steel beam. The connection joint of the concrete column and the steel beam comprises the concrete column, the steel beam, a half steel sleeve I and a half steel sleeve II. The half steel sleeve I and the half steel sleeve II are detachably connected and can be sleeved on the concrete column after being connected; the half steel sleeve I or the half steel sleeve II is fixedly connected with a connection arm which is detachably connected with the steel beam; and the concrete column is provided with a projecting shoulder, and the half steel sleeve I and the half steel sleeve II can abut against the projecting shoulder. The connection joint of the concrete column and the steel beam has the advantage of being high in bearing capacity and simple in construction.

Wearable electroencephalogram signal collection equipment for high-speed train drivers is characterized in that the two ends of an upper head band are fixed on the left and the right inner sides of a circumferential head band; four electroencephalogram collection electrodes are mounted on the lower side of the upper head band as well as on the inner side of the circumferential head band; a signal collection and transmission box is mounted on the left outer side or the right outer side of the circumferential head band; an electroencephalogram collector and a wireless data transmitter are arranged in the signal collection and transmission box; the electroencephalogram collector is electrically connected with the wireless data transmitter and the electroencephalogram collection electrodes respectively; and the electroencephalogram collection electrodes on the lower side of the upper head band and the inner side of the circumferential head band are corresponding to the left area temporalis media of a human brain, the right area temporalis media, the left central area, the right central area, the left area temporalis postrema, the right area temporalis postrema, the left forehead and the right forehead in position. The equipment can display the waking state of a driver through recording and analyzing so as to monitor and evaluate the fatigue state of the driver in a real-time manner, and reminding and assessing are carried out according to the detection result, so that the safety in operation of high-speed rails can be improved; and the equipment is simple, convenient and comfortable in operation.

The invention belongs to the field of household electrical appliance and specifically provides a washing machine and a washing agent device thereof. The present invention is directed to solving the problem that the conventional detergent box cannot sufficiently dissolve the detergent including the washing powder in water. For this purpose, the detergent device of the present invention comprises adetergent box and a water storage module; the detergent box is provided with a water outlet, and the water outlet is provided with an impeller; the water storage module comprises a water inlet chamber, a water outlet chamber, and a partition plate disposed therebetween; a through hole is provided in the partition for connecting the water inlet chamber and the water outlet chamber. When the detergent box is inserted into the water outlet chamber, the impeller has a through hole at the projected position of the partition so that the water falling from the through hole and the detergent solutionflowing out from the outlet of the detergent box can simultaneously drive the impeller to rotate in one direction and therefore stirring the detergent solution. Therefore, the detergent device of thepresent invention can sufficiently dissolve the detergent in water to prevent the washing powder from agglomerating.

The invention discloses a windscreen wiper connecting device, which comprises a connecting seat and a connector. Each cooperation surface formed after the connecting seat and the connector are subjected to splicing and clamping cooperation is configured as follows: a distance between each of the two clamping cooperation surfaces and a supporting cooperation surface is equal; two clamping grooves are in 180-degree rotary symmetry relative to a first rotary shaft; and the first rotary shaft is an intersection line of the symmetry planes of the two splicing cooperation surfaces and the symmetry planes of two abutting cooperation surfaces. Therefore, the connector can be stably installed on the connecting seat in two opposite directions, the windscreen wiper connecting device can adapt to theinstallation of a windscreen wiper of a left rudder vehicle or a right rudder vehicle only by changing an installation direction for installing the connector to the connecting seat, a windscreen wipermanufacturer does not need to design and produce the connecting devices which independently adapt to different installation directions, and the cost of each item is saved.

The invention discloses a precision anti-aluminum running die-casting device, which comprises a main die and an insert fixed on the main die, wherein the main die consists of a fixed die and a movable die fit with the fixed die; the insert is inserted in the fixed die; and the fitting surfaces of the insert and the fixed die are non-planar surfaces. In the invention, the fitting surfaces of the fixed die and the insert are non-planar surfaces instead of linear surfaces, so the fit clearance between the insert and the fixed die are reduced and the aluminum running is effectively avoided in an aluminum alloy die-casting process.

The invention belongs to the technical field of coal mine underground roadway repairing equipment and in particular relates to a multifunctional roadway repairing machine which is applicable to coal mine underground roadway cleaning, ditch digging, undercover rock breaking and slope expansion work. The multifunctional roadway repairing machine provided by the invention comprises a walking part, a machine body part, a cutting assembly, a drilling arm part and a hydraulic system, wherein a walking mechanism is arranged at the lower side of the machine body part; the cutting assembly is arranged at the front end of the machine body part; the drilling arm part is arranged at the right side of the machine body part; the hydraulic system is arranged at the tail end of the machine body part. According to the multifunctional roadway repairing machine provided by the invention, multidirectional breaking work of a side wall, a bottom plate, a mining and tunneling working surface and the like in a narrow roadway is realized, and rapid loading and unloading of materials are realized through a mini-type shovel bucket at the front end of a supporting arm; a machine set is provided with a mechanical drilling arm capable of doing drilling work and certain useless anchoring holes of top slope anchor rods can be marked so that one machine has various functions; the whole machine works mechanically so that the labor intensity of workers is alleviated, the labor safety risks of workers is are reduced and the working efficiency is improved.

The invention provides a container boat with cargo loading and unloading functions, and belongs to the technical field of boat transportation equipment. The container boat with the cargo loading and unloading functions comprises a boat body, a desk, an upper layer building, a container carrier, a binding bridge and an executer, wherein the upper layer building and the container carrier are arranged on the deck of the boat body; the binding bridge is arranged at the two sides of the deck in the length direction of the boat body; the executer is arranged on the deck positioned between the container carrier and the upper layer building. A rail and a container trolley are used as the container carriers; in addition, a fixed lug plate is arranged beside the rail and is hinged to a fixed hole plate arranged at the container trolley through a shaft pin; the container trolley is temporarily fixed on the deck; the safety is higher; the container trolley is dragged to slide on the rail through a boat winch and a wharf winch; the loading and unloading on the container can be realized; the use of large-scale hoisting equipment is not needed; the loading and the unloading are more convenient; in addition, the containers are loaded and unloaded in a piled form; the loading and unloading efficiency is higher; the pressure of a professional container wharf can be relieved.

The invention provides a railway vehicle and a hook buffer device thereof. While curve pass is realized, a connecting structure is simplified, a fit clearance is reduced, and the fitting tightness between a tail hook pin and a pin hole is improved. The hook buffer device comprises a front slave plate base, a rear slave plate base and a bidirectional buffer, wherein the front slave plate base and the rear slave plate base are connected with a vehicle body; the bidirectional buffer is fixedly connected between the front slave plate base and the rear slave plate base and is provided with a carrying body with a buffering function and a connecting component acting on the carrying body; the connecting component is hinged to a vehicle hook through the tail hook pin; the tail hook pin extends up and down; a rotating component is assembled between at least one of the connecting component and the vehicle hook, and the tail hook pin, so that the connecting component and the vehicle hook relatively rotate in a vertical plane; the rotating component is matched with the connecting component and the vehicle hook, so that relative displacement between the connecting component and the vehicle hook in the front-back direction is limited. Due to the fact that the vehicle hook and the connecting component can be relatively fixed in the front-back direction, no matter in an assembling state or various working states, the longitudinal impact caused in a vehicle driving process can be obviously reduced, the usability of the vehicle is improved, and the abrasion is reduced.

The invention discloses a detection head for carrying out airtight detection between a valve and a valve seat of an engine. The detection head is characterized in that the detection head is provided with a guide rod (1); the guide rod (1) is connected with a measuring conical surface (2); the edge of the measuring conical surface (2) is provided with an annular nozzle (3); the measuring conical surface (2) is connected with a detection head body (4); the inside of the detection head body (4) is provided with an air circuit (7); the air circuit (7) is connected with an air pipe (5) through a joint; the annular nozzle (3) is communicated with the air pipe (5) through the air circuit (7); and the detection head body (4) is connected with a handle (6). The detection head has simple, convenient and rapid operation, high detection efficiency and high precision.

The invention relates to an auxiliary device for borings of coaxial large span length ear base holes and a method for manufacturing the borings. The auxiliary device comprises an extending knife bar, a transitional supporting sleeve and a support, wherein the transitional supporting sleeve is inserted in an ear base hole which is manufactured through a common short knife bar and near a constructional element of the end surface of a machine tool main axle, a support supporting sleeve is inserted in a round hole on the support, and the extending knife bar is passed respectively through the transitional supporting sleeve and the support supporting sleeve and supported in auxiliary by the transitional supporting sleeve and the support supporting sleeve. The method for manufacturing the borings adopts the auxiliary device to manufacture the coaxial long center ear base holes on a large scale boring and milling machine. The coaxiality of coaxial ear base holes and center distance and the depth of parallelism between central lines of different axis ear base holes can be guaranteed, a derrick and a drill floor are connected on a basal seat after adopting the method to manufacture the borings of coaxial long center ear-seat holes on large scale structural elements as a driller, which has high assembly preciseness, little cooperating gap, and is stable while in use, installing working amount can be decreased greatly, and installing working efficiency can be increased.

The invention relates to a swabbing parameter matching non-stop intermittent oil pumping and production system. The system is characterized by being composed of an intelligent controller, a frequencyconverter and a special oil pump. An electric parameter test acquisition device is installed in the intelligent controller, embedded software is written in the intelligent controller, the active powerof a pumping unit is tested in real time, the working fluid level depth of an oil well is calculated according to the active power and structural parameters of the pumping unit, on this basis, when the working fluid level reaches a certain range, an intelligent program is started automatically, every time after the pumping unit reaches a top dead center, a crank is controlled to swing within a small angle range instead of immediate starting of a lower stroke, the time is provided for filling of the special oil pump, after the crank swings for a set time, an oil production program is started,and the operations are repeated; the oil pump is kept to always work under the optimal submergence condition while the high pumping efficiency is ensured; meanwhile, the pumping diameter of the oil pump is increased, the oil production stroke frequency of the pumping unit is greatly reduced under the condition of the same liquid yield, and the energy consumption of the system is reduced.

The invention relates to the technical field of mechanical transmission components, in particular to a split type gear. The split type gear comprises a left half gear body, a right half gear body, C-shaped grooves, C-shaped protrusions, fixing strips and bolts. The C-shaped grooves and the C-shaped protrusions are formed on the left half gear body and the right half gear body and fixedly connected through the fixing strips. Two ends of the fixing strips are fixedly connected with the left half gear body and the right half gear body through the bolts. The split type gear is simple, compact and reasonable in structure, convenient and fast to assemble and reliable in connection. Connection between the gear bodies is compact, and a matching gap is small. When the gear is abraded and needs replacing, the gear can be directly detached. Repairing difficulty caused by gear abrasion is eliminated, repairing is convenient, cost is saved, maintaining time is saved, and the split type gear is easy to apply, popularize and use.

The invention discloses a powder metallurgy oil-free lubricating bearing and a method for preparing the same. The powder metallurgy oil-free lubricating bearing comprises a shaft body provided with an axial central hole, and the outer surface of the shaft body is provided with an oil storage tank. The preparation method comprises the following steps: (1) evenly mixing Cu-Sn powder and C powder for forming, wherein the weight portion of all components is that: C is 0.5 to 3.0 portion, Cu is 85 to 93 portions and Sn is 5 to 13 portions; (2) controlling the temperature to between 650 and 730 DEG C, and performing sintering; (3) orderly performing finishing and cleaning; (4) performing vacuum oil immersion; and (5) performing deoiling treatment. The product has high precision and good dimension stability. Because the internal diameter tolerance of the product is controlled at 8u, and the axiality of the product is less than 0.05mm, and the matching gap between the product and the shaft is small, so that the friction contact area is small, the rotating efficiency of a fan is improved, the operating noise of the fan is reduced, and the service life of the fan is prolonged.

The invention relates to a transporting roll platform structure of roll wheel transportation sanding machine. Two or a plurality of transporting rolls are positioned on an axial seat in a roll platform frame; one end of the two or the plurality of transporting roll are respectively connected with a reduction gearbox located outside the roll platform frame through a transporting shaft and a universal joint; one roll or two or a plurality of lower support rolls are respectively distributed among a plurality of transporting rolls and the lower support rolls are driven by the transporting rolls through a transmission mechanism. The invention has the advantages that: first, the lower support roll adopts the adjustable structure and is designed into the structure with one side adjustable or two sides adjustable, which greatly facilitates the adjustment of sand cutting capacity at the two sides in grinding and overcomes the defects in background technology; second, a cross drive transporting rolls formed by the transporting shaft and the universal joint is used for minimizing a tolerance clearance; third, the reduction gearbox is positioned outside the roll platform frame, thus narrow the roll platform frame, lightening the weight as well as improving rigidity of the roll platform frame, a machine frame and a sanding joint; fourth, convenience and reliability of maintenance are greatly improved.

The invention discloses a high-speed spindle for a spinning frame. The high-speed spindle comprises a spindle blade, wherein an upper bearing is arranged at the upper part of the spindle blade and a bearing seat is arranged outside the upper bearing; an elastic tube is arranged at the lower part of the spindle blade; a lower bearing is arranged at the lower end of the spindle blade in the elastic tube; spiral linear grooves are formed on the surface of the spindle blade and comprise a first spiral linear groove, a second spiral linear groove and a third spiral linear groove; the first spiral linear groove is arranged at the lower part on which the lower bearing is arranged, of the spindle blade; the third spiral linear groove is arranged at the upper par on which the upper bearing is arranged, of the spindle blade; and the second spiral linear groove is arranged between the first spiral linear groove and the second spiral linear groove on the spindle blade. The high-speed spindle for the spinning frame is strong in bearing capacity, high in centering precision and good in high-speed stability, and the service life of the spindle can be prolonged effectively.

The invention relates to a low-temperature medium liquefaction device which comprises a Dewar and a heat exchange assembly, wherein the heat exchange assembly comprises a heat exchanger, a sleeve, a refrigerator cold head, a collector tube and a transmission tube; the upper end of the sleeve is hermetically and fixedly connected to the upper part of an inner cavity of the Dewar, and the lower end of the sleeve is hermetically and fixedly communicated with the collector tube; one end of the transmission tube is hermetically and fixedly communicated with the lower part of the collector tube, the middle part of the transmission tube is hermetically and fixedly connected with the Dewar, and the other end of the transmission tube is communicated to a cooled object outside the Dewar; the upper part of the refrigerator cold head is hermetically and fixedly connected with the Dewar, the lower part of the refrigerator cold head is arranged in the inner cavity of the sleeve, and the lower end of the refrigerator cold head is connected with the heat exchanger. The low-temperature medium liquefaction device disclosed by the invention has the advantages that: the heat transfer area at the low-temperature end of the refrigerator cold head is fully utilized, the heat leakage quantity is reduced, the working efficiency is improved, the energy resources are saved, the convenience for assembly and disassembly is achieved, and the manufacturing and maintaining cost is reduced.

The invention discloses a multi-stage rapid conversion gas protection device for argon arc welding of elbow parts. The multi-stage rapid conversion gas protection device for argon arc welding of elbowparts comprises a mounting seat, wherein the mounting seat is arranged at the end part of an elbow part, a plug for fixing the port of the part is arranged on the mounting seat, a plurality of part mounting grooves are machined in the surface of one side, matched with the part port, of the plug, the part mounting grooves are circular arc-shaped grooves which are concentrically arranged, and different part mounting grooves are matched with the parts with different sizes; and the mounting seat penetrates through the plug and is provided with an argon through hole, and argon is introduced into the elbow part from the outside of the mounting seat through the argon through hole. According to the multi-stage rapid conversion gas protection device for argon arc welding of elbow parts, the purpose of providing welding protection for the elbow parts with various sizes and specifications can be realized by the same fixture, the fixture is convenient to install, the production efficiency can beimproved, the tooling cost can be reduced, and the application prospect is wide.

The invention provides a boring machine, comprising a boring cutter feeding driving device, a feeding screw rod, a boring cutter, a boring rod, a gearbox part, a gearbox part fixing bracket, a boring rod rotation driving device, and a boring rod positioning mechanism, wherein the boring rod positioning mechanism is provided with a first bolt, a first nut, a pressing pipe, an upper conical shaft, a positioning conical sleeve, a lower conical shaft and a boring rod positioning shaft; the feeding screw rod is assembled in the boring rod; one end of the feeding screw rod is connected with the boring cutter feeding driving device; the other end of the feeding screw rod is arranged in the boring rod; a cutter block is arranged at the lower part of the feeding screw rod; the gearbox part is arranged on the gearbox part fixing bracket and is assembled on the external surface of the boring rod; the gearbox part drives the boring rod to rotate; the boring rod rotation driving device is connected with the gearbox part; and the lower part of the boring rod is arranged in the second hole of the boring rod positioning shaft. The boring machine has small volume, light weight, compact structure, high machining precision on parts and small fitting clearance, and can be used for carrying out boring on the hole with depth and small aperture.

A conical Hooke's hinge comprises a cross tail spindle, a ball-bearing without an inner sleeve, a sealed end cover and static and moving hinge bodies. On the static hinge body is opened a hole No.1 and on the moving hinge body is opened a hole No.2. On the internal hole surfaces at the outer ends of No.1 and No.2 holes are opened internal thread and on the sealed end cover are opened external threads. The ball-bearing is set on the cylindrical external surface at the inner ends of No.1 and No.2 holes. Four conical ends of the cross tail spindle are inserted in the internal hole of the ball-bearing and the sealed end cover is screwed in the internal thread.

The invention relates to the field of rapid dismounting and locking devices, in particular to a flip machine box, a non-tool operation type locking device thereof and a lock. The non-tool operation type locking device comprises the lock and a locking dog. The lock comprises a fixing sleeve extending in the forward and backward directions. The front end of the fixing sleeve is provided with a mounting structure which forms a mounting base of the lock. The fixing sleeve is provided with a locking hole. The front end of the locking hole is provided with a locking dog inserting opening allowing the locking dog to be inserted. The hole wall of the locking hole is provided with a ball mounting hole penetrating through the side wall of the fixing sleeve. A ball is assembled into the ball mounting hole in a guiding mode. The diameter of the ball is larger than the length of the ball mounting hole. The locking dog is provided with a locking groove used for being in locking fit with the ball. The periphery of the fixing sleeve is sleeved with a mobile sleeve. The fixing sleeve is provided with an elastic locking component used for providing forward acting force for the mobile sleeve. The mobile sleeve is mounted on the fixing sleeve in an abutting mode through the elastic locking component and provided with an abut-pushing wall face and a receding structure. By adoption of the flip machine box, the non-tool operation type locking device thereof and the lock, the problems that existing locking devices are inconvenient to use and unreliable in locking are solved.

The invention belongs to the technical field of coal mine underground roadway maintenance and repair equipment, and particularly relates to a roadway maintenance and repair machine which is suitable for an underground coal mine and integrates the functions of milling, digging, crushing, loading, transportation, anchor rod support and the like into a whole. According to the technical scheme, the multifunctional roadway maintenance and repair machine comprises a walking part, a machine body part, a cutting assembly, a drill arm part, a conveying part, an electrical system and a hydraulic system;and the walking part is arranged below the machine body part, the cutting assembly is arranged at the front end of the machine body part, the drill arm part is arranged at the left side of the machine body part, the conveying part is arranged in the middle of the machine body part, the electrical system is arranged at the left side of the machine body part, and the hydraulic system is arranged atthe right side of the machine body part. The machine can rotate by 180 degrees in the horizontal direction and the vertical direction, and the use range of equipment is greatly expanded. Operation isstable, maintenance is convenient, and 360-degree omnibearing positioning can be carried out on an anchor cable hole of an anchor rod through matched rotation of two swing oil cylinders.

The invention provides an iron core block of a motor, a stator core, a manufacturing method thereof, a stator, the motor and a household appliance. The iron core block comprises a yoke part and a tooth part; along the circumferential direction of the iron core block, a first end of the yoke part is arranged as a first spliced end, an accommodating slot is formed on the first spliced end, bucklingparts are respectively arranged on two side walls of the accommodating slot, the buckling parts extend along an axial direction parallel to the yoke part, and the buckling parts shift toward one sideaway from the accommodating slot under an external acting force; along the circumferential direction of the iron core block, a second end of the yoke part is arranged as a second spliced end, the second spliced end is equipped with a joint bulge, buckling slots are respectively formed on the two sides of the joint bulge, and the buckling slots stretch along the axial direction parallel to the yokepart; the joint bulge of another iron core block can be accommodated in the accommodating slot; the buckling parts are buckled with the buckling slots of another iron core block and are used for limiting the relative displacement of two adjacent iron core blocks along the circumferential direction; the iron core block is capable of reducing the fitting gap between two adjacent iron core blocks, so that the performance stability of the motor can be ensured.

The invention discloses a double nut precision ball screw pair. The double nut precision ball screw pair comprises ball nuts and a ball screw which is supported through upper and lower supporting components, is driven through rotation of the ball nut and can only do axial feeding; the ball nuts are composed of the main ball nut and the auxiliary ball nut which are relatively limited in the circumferential direction and can relatively move in the axial direction, the ball diameter of the ball nuts is slightly smaller than the diameter of rollaway nests on the ball nuts and the ball screw, and the lower supporting component is sleeved with an anti-backlash nut capable of doing spiral rotation relative to the lower supporting component so as to be in axial contact with the auxiliary ball nut; and the main ball nut and the anti-backlash nut are driven by the driving device to rotate. By means of the double nut precision ball screw pair, high-precision and high-rigidness axial movement of the ball screws along the main design standard shaft of a machine tool can be guaranteed.