402results about How to "Avoid partial wear" patented technology

A disc brake device is provided with a wedge rod (20) axially moved by an actuator (4) and orthogonally arranged to a wheel axle, a wedge (5) mounted on the wedge rod (20) and having an inclined surface, a main roller (6) rolling on the inclined surface, and a link (12) rocking in accordance with a movement of the main roller (6). An intermediate portion of the link (12) and a base end of the brake arm (3) are coupled via a gap adjusting mechanism (14). The base end of the brake arm (3) is boosted, pressed, and expanded in accordance with the movement of the main roller (6), and a brake pad disposed at a rocking end of the brake arm (3) is pressed and actuated. A pair of sub-rollers capable of rolling on guide rails are disposed coaxially with the main roller (6) on both sides of the main roller (6).

Provided is a pneumatic tire enabling an increase in noise performance while achieving both steering stability on dry road surface and driving performance on wet road surface. In a pneumatic tire (T) including a center land portion (13), an inner central land portion (14), an outer central land portion (15), an inner shoulder land portion (17), and an outer central land portion (18) which are separately formed by at least four main grooves (11), the pneumatic tire having a designated vehicle mount direction, the center land portion (13) is formed with center lug grooves (20) that open only to one of the main grooves (11) on the vehicle inner side, the inner central land portion (14) is formed with inner central lug grooves (21) that open only to another of the main grooves on the vehicle inner side, each of the lug grooves (20, 21) comprising a first inclination portion (20A, 21A) positioned on an opening end side and having a relatively large inclination angle and a second inclination portion (20B, 21B) positioned on a terminal side and having a relatively small inclination angle, and an inner central sipe (22) is formed at the terminal portion of each of the inner central lug grooves (21) terminating within the inner central land portion (14), wherein the relationships L1 ;gt; L2 and L3 ;gt; L4 are satisfied, where L1 is the length of the center lug groove (20), L2 is the length of the inner central lug groove (21), L3 is the sum of the length L2 and the length of the inner central sipe (22), and L4 is the width of the inner central land portion (14).

The invention discloses an automatic stamping machine, which comprises an upper die assembly and a lower die assembly, the lower die assembly comprises a lower die and a lower die driver, and the lower die driver comprises a turntable assembly and a turntable drive motor. The invention can ensure that an operation position of a stamping operator can be isolated from a stamping position by a turntable, consequently, an enough safe distance exists between the operation position and the stamping position when an upper material and a lower material are stamped, the hands of the operator can be protected from injury when misoperation or a mechanical fault occurs, and thereby safety is high; because an automatic control system controls the stamping process, human intervention is reduced, safety accidents caused by human subjectivity are eliminated, and the working efficiency is increased; because the combined structure of a central disk and an annular bearing platform is provided with buffer springs, the eccentric wear between the central disk, a drive shaft and bearings can be effectively prevented, the transmission of stamping force can be effectively obstructed as well, so that the central disk and the drive assembly thereof can be prevented from being affected by the stamping force, and thereby the service lives of the stamping turntable and the driver thereof can be prolonged.

The invention relates to a land petroleum drilling rig device, in particular to an inclining and vertical well drilling rig automatic drill pipe slip device. A slip seat device of the inclining and vertical well drilling rig automatic drill pipe slip device comprises a slip seat and a shield, wherein the shield is installed on the slip seat, a hydraulic cylinder is hinged to a hinge pin which is fixedly welded to the slip seat, a piston rod which is used in cooperation with the hydraulic cylinder is hinged to a double-lug ring through a hinge pin, a driving rotary shaft is hinged to both the double-lug ring and a transmission connecting rod through hinge pins, the transmission connecting rod is hinged to a driven rotary shaft through a hinge pin, the driving rotary shaft and the driven rotary shaft are installed in round holes formed in the upper end of the slip seat, a left lifting arm is fixedly connected with the driven rotary shaft, and a right lifting arm is fixedly connected with the driving rotary shaft. The inclining and vertical well drilling rig automatic drill pipe slip device has the advantages that a drill rod is clamped and held in the process of tripping operation, the labor intensity of workers is relieved, a drill stem is prevented from wearing a well opening in an eccentric mode when an inclining well is drilled, and safety and the working efficiency are improved. The inclining and vertical well drilling rig automatic drill pipe slip device overcomes the defect that a drill stem wears the well opening in an eccentric mode when the inclining well is drilled through an existing drill pipe slip device.

The invention discloses a slide powder-feeding three-way reversing valve which is characterized in that a columnar valve cavity is reserved in a valve body with one inlet and two outlets, a double-flow-passage columnar spool which can slide linearly along the columnar valve cavity is disposed in the same; a valve body inlet passage A, a valve body outlet passage B and a valve body outlet passage C are arranged on the valve body; the a valve body outlet passage B is coaxial with the valve body inlet passage A, an acute included angle a is formed by outflow directions of the valve body outlet passage B and the valve body outlet passage C, axis of each valve body passage is on a plane M; a spool passage U and a spool passage V are arranged in the columnar spool; and different positions of the columnar spool in the columnar valve cavity correspond to different on and off states. By the slide powder-feeding three-way reversing valve, operational stability of a powder feeding device is improved effectively and service life of the device is prolonged.

The invention discloses a metering pump with an entire solid eccentric wheel travel adjustment mechanism. The metering pump comprises an amount adjustment lead screw, a moving shaft, a hollow shaft, a connection rod, the entire eccentric wheel, a worm gear, a worm and a slide rod, wherein one end of the amount adjustment lead screw is connected with the moving shaft in a mode of coaxial relative motion, the moving shaft is sleeved in the hollow shaft, a chute is formed in the moving shaft, a slide block is arranged in the chute, the entire eccentric wheel is sleeved on the hollow shaft and fixed with the connection rod, the connection rod is connected with the slide rod, and the worm wheel is in cup joint to the hollow shaft and is meshed with the worm. The metering pump is large in bearing capacity, high in metering precision and long in service life.

The invention provides a long-plunger type dual-barrel coal-dust resistant discharging and extracting pump capable of preventing eccentric wear and coal dust from burying pump, blocking pump and prolonging the pump detection period. The pump consists of a centering body, a pump barrel assembly, a piston assembly, a liquid outlet valve and a liquid inlet valve assembly; a centering locking claw is inserted in a lock sleeve of an upper coupling to realize positioning and sealing of the centering body and avoiding eccentric wear between the plunger and the pump barrel; an internal barrel can prevent the deposited coal dust in the annulus of a bar pipe from entering the gap between the plunger and the pump barrel; the coal dust is dropped back to a tail pipe through the annual cavity between the external barrel and the pump barrel to prevent the coal dust from burying the pump; the structure of the long-plunger short pump barrel can promptly discharge the coal dust in the gap between the plunger and the pump barrel, so as to protect the internal and external working surfaces of the pump barrel and preventing the pump from being blocked; the well liquid stored in the coal-dust resistant tank washes the coal dust in the liquid outlet valve cover and the coal dust deposited at the upper part of the liquid outlet valve through a jet orifice, so as to realize an automatic washing function of the liquid outlet valve and preventing the coal dust from jamming the pump; and a spring is cooperated with a liquid inlet valve ball positioning pin, so that the liquid inlet valve ball can be fast reset, and the pump valve under a low submergence can be realized in smooth on and off.

The invention relates to a packer, in particular to a hanging type oil layer protection packer, which belongs to a packer particularly suitable for the underground oil layer production of low-pressure wells or water-sensitive oil reservoirs. The hanging type oil layer protection packer comprises a back-off sub, a rotation prevention key, a screw, an upper joint, a slide sleeve, a shear pin, a press cap, a sealing pad, a center pipe, a lining sleeve, a leather cup type rubber tube, a cone body, a slips assembly and a lower joint, wherein a groove is formed on the inner side of the upper part of the upper joint, the upper end of the slide sleeve is inserted into the back-off sub, the slide sleeve is fixed on the upper joint, the upper joint is connected with the press cap, the cone body is sheathed on the leather cup type rubber tube and is directly connected with the lining sleeve, and the lining sleeve, the leather cup type rubber tube, the cone body and the slips assembly are sheathed on the center pipe. The hanging type oil layer protection packer has a reasonable and compact structure, can be operated without hands, and can also be operated with hands, the structural conversion is flexible, the self sealing type rubber rube has reliable sealing, a flow discharge passage is designed in the tool structure, and the pumping generated in the pipe column dismounting process can be avoided. The construction working procedure is convenient, the oil layer can be protected, and the well flushing and oil extraction requirements can be met.

The present invention relates to a submersible oil extraction pump driven by a direct-current magnetoelectric linear stepper motor. The oil extraction pump is composed of a cable (1), a motor cylinder (2), a motor mover (3), a diameter-variable sheath (4), a pump cylinder (5), a plunger (6) and a ball valve set (7); wherein, the upper and the lower ends of the cable (1) are respectively connected with coils arranged in a ground control cabinet (8) and the motor cylinder (2); the upper and the lower ends of the motor cylinder (2) are respectively connected with an oil pipe (9) and the diameter-variable sheath (4) by means of threads; the lower end of the diameter-variable sheath (4) is connected with the pump cylinder (5) by means of threads; the motor mover (3), the plunger (6) and the ball valve set (7) are respectively arranged in the motor cylinder (2) and the pump cylinder (5); and the lower end of the motor mover (3) is connected with the upper end of the plunger (6). With a novel structure, the oil extraction pump rejects the complex, large ground oil extraction pump and the 1000-meter sucker rod and can avoid the eccentric abrasion of the sucker rod and reduce operation cost. Compared with the prior centrifugal electric submersible pump, the oil extraction pump has the advantages of low energy consumption and fault rate, long service life, etc. and can be used in a deep well.

The invention provides a pattern structure of an inflatable radial ply tyre for over loading, which can effectively prevent uneven wear such as wheel track wear generated at the edge of the pattern block in driving and prevent peeling due to heating in driving in the condition of improving the brake force and drive force but not reducing any performance so as to increase the endurance life of the tire. The invention is characterized by comprising half pattern grooves (SG1, SG2, SG3, SG4) with a step shape, which take a center pattern groove (G2) as center and are obliquely arranged with an interval corresponding to each pitch on the center blocks (B2, B3) at two sides of the center pattern groove to communicate a center pattern groove (G2) and side pattern grooves (G1, G3), wherein the center pattern groove (G2) is formed in a sawtooth shape in the center of the tire tread and the side pattern grooves (G1, G3) are formed in a sawtooth shape at two sides. The half pattern grooves (SG1, SG2) formed on the center pattern block (B2) and the half pattern groove (SG3, SG4) formed on the center pattern block (B3) are intercrossed and have different oriention. A transverse pattern groove (LG) is formed by bending an angle to the width direction of the tire tread.

The present invention provides a coiler which can increase the braking force of the coiler and can restrain the coiler abrasion and deformation caused by the braking. The coiler is provided with a bobbin (52) which has a disc outside plate (52b) that is formed to a large shape compared with a disc inner plate (52c). A braking mechanism (89A) clamps a large-shaped part (52e) of the disc outside plate (52b) that has a shape larger than that of the disc inner plate (52c) for braking the bobbin (52). In an embodiment of the invention, the braking mechanism (89A) clamps the disc outside plate (52b) through a braking disc (90h) and a pressure lever (90b) of a solenoid (89a) in power failure.

The invention relates to a sedan tire structure, in particular to a tire tread pattern structure of a sedan tire. The tire tread of the sedan meridian tire comprises central pattern blocks, lateral pattern blocks and tire shoulder pattern blocks, wherein the central pattern blocks are the longitudinal pattern blocks; the lateral pattern blocks and the tire shoulder pattern blocks are regularly arranged on the left side and the right side of the central pattern blocks from inside to outside in sequence; the central pattern blocks are positioned on the central line position of the tire tread; the same arched pattern ditch is spaced between the central pattern blocks and the lateral pattern blocks, between the two adjacent lateral pattern blocks, and between the two adjacent tire shoulder pattern blocks respectively; an inclined lateral pattern ditch is spaced between the two adjacent central pattern blocks; and a longitudinal circumferential pattern ditch is spaced between the lateral pattern blocks and the tire shoulder pattern blocks. The tire tread of the tire adopts mixed patterns, and has the advantages of sufficient braking force, good control performance and elegant appearance.

The present invention relates to a kind of horizontal high-pressure planetary roller mill. The technological scheme is that the planetary roller mill has main shaft installed horizontally in the right and left bearing seats via bearings, right bearing seat installed inside the frame bearing seat, one driving wheel fixed to the end of the right bearing seat, the other driving wheel fixed to right end of the main shaft, mill ring jacket on the support roller, mill ring inside the mill ring jacket, horizontally installed spiral roller inside the mill ring, conic surface connection between mill ring and mill ring jacket, and screw connection between the mill ring jacket and the left bearing seat. The planetary roller mill has the features of homogeneous distribution of material, high crushing efficiency, fine granularity of the product and low power consumption.

The invention relates to a tire structure for a vehicle, in particular to a tread of a meridian tire for a car. The tread of the meridian tire for the car comprises a central pattern block, lateral pattern blocks and a tire shoulder pattern block; the central pattern block is an integrative longitudinal pattern block, and the lateral pattern blocks are regularly arranged at left and right sides of the central pattern block sequentially from inside to outside; the central pattern block is located in the centre of the tread; the central pattern block is spaced from the lateral pattern blocks via main longitudinal circumferential pattern grooves; the lateral pattern blocks are spaced from the tire shoulder pattern block via auxiliary longitudinal circumferential pattern grooves; two adjacent lateral pattern blocks are spaced from each other via an inclined lateral pattern groove, and two ends of the lateral pattern blocks are respectively communicated with the main longitudinal circumferential pattern grooves and the auxiliary longitudinal circumferential pattern grooves; and the tire shoulder pattern block is an integrative longitudinal pattern block. The tread of the tire has the characteristics of adoption of mixed patterns, enough braking force, good maneuvering performance and elegant appearance.

The invention relates to a tire structure for an automobile, in particular to a tread pattern structure of a load-carrying automobile tire. A tire tread for a load-carrying automobile comprises central pattern blocks which are arranged at the central position of the tread, wherein central longitudinal circumferential pattern grooves are formed in the middle of the central pattern blocks, and are used for dividing the tire tread into a left part and a right part which are symmetrical to each other; auxiliary pattern grooves are formed on the central pattern blocks at intervals; the left and right sides of each central pattern block are provided with a tire shoulder pattern block respectively; the central pattern blocks are spaced from the tire shoulder pattern blocks through the longitudinal circumferential pattern grooves; and the tire shoulder pattern blocks have an integrated structure. Mixed patterns are used for the tread of the tire, and have sufficient braking force, high maneuvering performance and aesthetic and elegant appearance.