100results about How to "Avoid eccentric wear" patented technology

The invention relates to the technical field of control valves, in particular to an electric valve for regulating fluid flow. The electric valve comprises a valve seat component, a nut component and a valve needle lead screw component, wherein the valve seat component comprises a valve seat and a valve core seat; the nut component comprises a nut for mounting the valve needle lead screw component; and the lower end of the nut is sleeved with the upper end of the valve core seat. By the electric valve, the lower end of the nut which is used for mounting the valve needle lead screw component is connected with the upper end of the valve core seat in a sleeved mode, so that the coaxiality of the nut and a valve port of the valve core seat is extremely easy to guarantee, the coaxiality of a valve needle and the valve core seat is higher, and the problem that the valve port is loosely sealed or is subjected to eccentric wear can be solved. Meanwhile, because the coaxiality of the valve needle and the valve port is improved, the friction force can be obviously reduced when a rotor of a rotor component rotates, and the action reliability of the electric valve can be improved.

The invention discloses an automobile pedal assembly detecting tool. The automobile pedal assembly detecting tool comprises a base board, a positioning block and a clamp, wherein the positioning block and the clamp are arranged on the base board and are used for positioning a pedal assembly on the base board, and an accelerator cable hole detecting pin which is matched with an accelerator cable hole in the pedal assembly, a vacuum booster installation hole detecting pin which is matched with a vacuum booster installation hole in the pedal assembly and a main clutch cylinder hole detecting pin which is matched with a main clutch cylinder hole in the pedal assembly are arranged on the base board. The automobile pedal assembly detecting tool can detect all installation holes in the whole automobile pedal assembly, improve the assembling quality of the automobile pedal assembly, and prevent eccentric abrasion of a vacuum booster and a main clutch cylinder.

The invention discloses an electrically operated valve. The electrically operated valve comprises a valve plug base (1) which is provided with a valve plug cavity and a valve port (11) communicated with the valve plug cavity, and a valve needle (2) which is extended into the valve plug cavity and is matched with the valve port (11); a lead screw (3) is connected with the upper part of the valve needle (2); and a pilot sleeve (4) is arranged outside the lead screw (3) and is fixedly connected with the valve plug base (1). By the electrically operated valve, the concentricity between the pilot sleeve (4) and the valve port (11) can be improved so that the sealing performance between the valve needle (2) and the valve port (11) can be improved and the frictional resistance during rotation of a rotator (6) can be reduced. Moreover, the invention also discloses a heat exchange device comprising the electrically operated valve.

The invention discloses a material distributing screening machine, comprising a machine case (1), a forced fabric plate (2), a driving device (3), a filtering roller (4), a reducer motor (5) and an iron removing device (24), wherein the machine case (1) is provided with a feeding hole (6) and a plurality of discharging holes (10), the filtering roller (4) comprises a flange disk type roller (11) and a filtering rope type roller (12), the filtering roller (4) is provided with the driving device (3), the reducer motor (5) drives the filtering roller (4) to rotate by virtue of the driving device (3), and material enters from the feeding hole (6), is screened by the filtering roller (4) and is discharged by the discharging hole (10). The invention has the beneficial effects that: more than two materials in different grain sizes can be screened by setting different interstitial screen cuts, the working condition requirement for screening more than two materials can be met, screening efficiency is high, bulk material impact resistance is high, material is distributed more uniformly, no blockage is caused, and an iron piece contained in the material can be removed.

The invention discloses a retractable rope used for an elevator. The retractable rope is characterized by being composed of at least one bearing body capable of bearing independently and a wrapping layer, wherein the cross section of the retractable rope is oval, and the short axis of the oval is vertical to the retracting direction of the retractable rope. Compared with a plastic coated wire rope with a circular section, the retractable rope mainly has two advantages that (1) on the condition that the bearing force is the same, the contact area of the retractable rope and a running wheel is increased, the retractable rope is evenly stressed, and service life of a coated layer is prolonged; (2) a plurality of independent bearing bodies in the retractable rope are distributed in parallel, the diameter of each bearing body is 2 mm, according to the requirement in GB7588 that the rope diameter ratio can not be smaller than 40, and the diameter of the running wheel can be reduced to 100m. When the retractable rope is used, a traction pulley needs to have a groove type which is complementary with the appearance of the retractable rope so that the traction pulley can be well meshed with the rope when the elevator operates, the guide performance of the rope is improved and eccentric wear is restrained.

The invention discloses a sucker-rod pump device for coal seam gas exploitation. The sucker-rod device for the coal seam gas exploitation comprises an oil pumping unit, an oil pipe, a pumping rod, and a sucker-rod pump. The oil pipe is installed inside a casing pipe downhole. The sucker-rod pump comprises a pump cylinder and a plunger matched with each other. The pump cylinder is located at the lower end of the oil pipe and is communicated with the oil pipe. The bottom of the pump cylinder and the bottom of the plunger are both provided with traveling valves. An upper housing of the plunger is provided with a communicating hole. The oil pumping unit is located on the ground and is able to drive the plunger to reciprocate through the pumping rod. The pumping rod is a hollow structure. The joint between the pumping rod and the plunger is provided with an openable sealing structure for closing a casing pipe annular space and a rod tube annular space. The extraction is performed through the interior of the pumping rod upon opening the sealing structure. The sucker-rod pump device is able to use two extraction manners; the appropriate extraction manner can be selected based on the variation of the water yield. The two extraction manners can be continuously switched for continuously and stably reducing the pressure and draining the water in the shaft without well repair operations, accordingly ensuring the continuous and stable production of the coal seam gas well.

The invention provides a servo alignment pneumatic flexible connector which is applied to the connection of an offshore drilling supporting platform and other platforms. A gas storage tank of the flexible connector and a cylinder and a piston cylinder are arranged in a trinity mode and the structure is compact; the difference of the required gas is timely complemented through the gas stored in the gas storage tank, the platform vibration loads are balanced by the piston cylinder through the compression or expansion of the gas of an upper chamber and a lower chamber of the cylinder and the applied force of retraction and extension of an inner spring and an outer spring together, and the radial displacement is automatically adjusted; the servo alignment is implemented through an alignment device and accordingly the same axis of the cylinder and the piston cylinder is maintained and the angle deviation adjustment is achieved through a deviation adjustment device and accordingly the upper end surface of the deviation adjustment device is maintained to be level; an upper guider is combined with a lower guider to implement the radial guide effect to enable the axis of the cylinder and the axis of the piston cylinder to be overlapped and meanwhile the cylinder and the piston cylinder are sealed through a combined packing sealing structure of a sealing body; the automatic gas filling or closing is ensured through an automatic gas filler, the emergency release of the air pressure is implemented through a pressure safety valve, and the integral device is easy to detach and install and operate and maintain.

The invention discloses a lever type magnetic suspension brake. The middle parts of an outside lever device and an inside lever device are respectively connected at two sides of a pole plate through respective middle shaft and respective shaft bracket; a rubber spring is arranged between each of the two shaft brackets and the pole plate; the opposite inner side surfaces of the upper ends of the outside lever device and the inside lever device are respectively connected with a brake pad through a pin shaft; and the lower ends of the outside lever device and the inside lever device are respectively connected at two sides of a hydraulic cylinder through a connecting shaft. A plier-type brake structure is adopted by the lever type magnetic suspension brake, and the hydraulic cylinder is used as a brake force generating unit and controlled by a brake control loop such as brake valves, wherein a brake arm at the inner side of the brake is of a small bending radius structure and therefore the installation of the brake arm at the inner side is facilitated. The ultimate displacement of the brake arm is plus or minus 10mm; and the inclined angle of a track can be protected against eccentric wear through the slight up and down swinging of the brake pad, thus good tightness is obtained and maintenance and installation are facilitated; and friction plates can be conveniently dismantled to replace and the operation cost is saved.

A preparing method of a double-sided knitted carbon brake disc prefabricated body relates to a double-sided composite knitting technology, and the double-sided composite knitted prefabricated body isformed by overlapping and laying mesh tire/weft-free cloth. The mode of laying one mesh tire or weft-free cloth on each side of the two sides for double-sided knitting is adopted. The feeding speed, knitting frequency, knitting pressure and knitting speed of a composite needle machine reach the optimum compatibility, and the mode of laying the mesh tire to the mesh tire and laying the weft-free cloth to the weft-free cloth in a back-to-back structure is adopted. The deposition rate is increased by 20%, and the eccentric wear phenomenon can be well prevented.

The invention relates to a grinding and machining device for traction tables of coupler bodies and comprises a grinding and machining device for grinding working surfaces of an upper traction table and/or a lower traction table through a cavity area between the upper traction table and/or the lower traction table of the coupler body; a radius adjusting device arranged on the grinding and machiningdevice and used for adjusting a grinding radius of the grinding and machining device; a height adjusting device which is arranged between the upper traction table and the lower traction table, installed on the radius adjusting device and used for adjusting the height of the grinding and machining device; and a circle center locating device connected to the height adjusting device and used for adjusting the height adjusting device to enable the height adjusting device to be concentric with an upper hook ear hole and a lower hook ear hole. According to the grinding and machining device for thetraction tables of the coupler bodies, the grinding and machining of the working surfaces of the upper and lower traction table is realized through positioning achieved by the upper and lower hook earholes, and the concentricity of the arc working surfaces of the upper and lower traction tables and the relative positions of the upper and lower hook ear holes is effectively improved.

The invention provides a novel absorber capable of effectively avoiding eccentric abrasion of a connecting rod. The novel absorber solves the problem that when an existing absorber is used, the connecting rod is prone to eccentric abrasion. The novel absorber comprises the connecting rod, a guider and a recovery buffering block, wherein the connecting rod penetrates through an inner cylinder barrel of the absorber. At least two threads with semi-circular cross sections are machined on the surface of the connecting rod from the lower end to the upper portion. The inner cylinder barrel is composed of an upper inner cylinder barrel body and a lower cylinder barrel body which are connected through a circular nut. A thread of the circular nut is matched with the threads on the connecting rod. The two end faces of the circular nut are each provided with a groove, wherein the depth of each groove is 3 mm, the width of each groove is equal to the thickness of the inner cylinder barrel wall, and the grooves can be matched with the inner cylinder barrel and can keep sealing. According to the novel absorber, the eccentric abrasion of the connecting rod is effectively prevented, abrasion to the connecting rod is relieved, and therefore the service life of the absorber is prolonged.

The invention discloses a pneumatic equal-pressure multi-stage sealing device for a wellhead of a pumping unit. Relates to the technical field of oil-gas well equipment. The lower end of the upper section is connected with the middle section through a flange and a bolt, the packing is clamped between the upper section and the middle section, and the air bag is installed in the space between the upper section and the middle section on the outer side of the packing. The device has the following beneficial effects that the air bag has an energy storage function, the packing is pressurized by continuous and uniform force, close coupling of the packing and a sucker rod is guaranteed, the hollow ball is arranged to be pushed to the center hole along the conical surface of the middle section by the pressure of the bottom of a wellhead after the rod is broken, blowout accidents are prevented, the deviation adjusting and follow-up function mechanism is automatically coaxial with the sucker rod, and the operation is convenient. The eccentric wear phenomenon is avoided, the service life of the packing and the sucker rod is prolonged, the sucker rod pushes the packing box through the centralizing sleeve, the deviation adjusting mechanism and the follow-up mechanism move flexibly along with the sucker rod, it is guaranteed that the follow-up mechanism and the sucker rod work coaxially all the time, eccentric wear is eradicated, and the service life of the sucker rod and the packing is prolonged.

The invention discloses a bearing bush self-adaptive contact friction wear test device, which relates to the field of bearing bush friction wear experiment test equipment, and mainly comprises a motor, a coupler, a torque sensor, a slip ring, a transmission shaft, a turntable, a linear bearing, a slide bar, a ball rod joint bearing, an expansion sleeve, a radial joint bearing, a bearing bush clamp, a triangular block, a force transmission plate, an air cylinder and the like. The ring sample and the bearing bush sample in the device are in sliding friction. By adding the self-adaptive contact device, the ring sample and the bearing bush sample are in full-time stable contact, the eccentric wear phenomenon is overcome, and the accuracy of a friction wear test result is improved; the loading and unloading stability of the device is improved by additionally arranging the spring at the triangular block for lifting the bearing bush clamp; oil outlets are formed in different height positions of the bearing bush clamp, so that the adaptability of a friction-wear test under various lubricating oil quantities is improved; and by simplifying the device and reducing the volume, the assembling easiness and green economy of the test device are improved.