32results about How to "Eliminate thread clearance" patented technology

The invention discloses a levelling device and a levelling method for a polishing head. The levelling device comprises a spline shaft, a spline hub, a bearing sleeve, a bearing end cap, a bearing pre-tightening ring, a bearing, an adjusting panel, a base plate and at least three levelling screw sets; the adjusting panel is arranged on the upper surface of the base plate; the bearing end cap is matched with the bearing pre-tightening ring for pre-tightening the outer ring of the bearing; the bearing is arranged between the spline hub and the bearing sleeve; the spline shaft is accommodated in the spline hub; and each levelling screw set is connected onto the adjusting panel. According to the levelling device, levelling operation is transferred to the polishing head through the spline shaft, and the area of the polishing head is large, so that the polishing head is applicable to polishing of wafers with large sizes. Loosening-proof flanges are used for eliminating threaded clearances between levelling nuts and the adjusting panel; the levelling precision is improved; and the phenomenon that a pre-levelled position is changed by friction force during a process of rotating fastening bolts is prevented.

The invention provides a grinding wheel dresser for a grinding machine, which aims at solving the technical problems of poor universality and waste of processing time and labor in the existing grinding wheel dresser. The grinding wheel dresser comprises a diamond pen base, a swing rod, a machine base and a driving device, wherein a diamond pen is arranged on the diamond pen base; both ends of the swing rod are rotationally supported at both ends of the machine base; the driving device is used for driving the swing rod to rotate. The grinding wheel dresser is characterized in that a shaft hole is formed in the swing rod, a slide sleeve is arranged in the shaft hole, and the diamond pen base is inserted into the slide sleeve; slide blocks are arranged at both radial ends of the inner side of the shaft hole and extend in the axial direction, both radial ends of the slide sleeve are provided with slide grooves which are matched with the slide blocks, the two sides of each of the slide blocks and the slide grooves are provided with arc-shaped grooves, and steel balls fill the opposite arc-shaped grooves; a thread sleeve is arranged at the tail part of the slide sleeve, and is connected with an adjusting rod through threads, the adjusting rod is parallel with the axis of the shaft hole, an end cover is covered at the tail part of the shaft hole, the adjusting rod penetrates through the end cover and is vertically and fixedly connected with a dial, a spring is sheathed on the thread sleeve, and both ends of the spring are respectively abutted against the slide sleeve and the end cover.

The invention discloses an adjustment device and method for measuring a nanometer non-contact optical fiber sensor. The adjustment device comprises an adjustment nut. An optical fiber sensor is arranged in the lower part of the adjustment nut in a penetrating manner, and a fixing rod is arranged in the upper part in a penetrating manner. The optical fiber sensor is installed in the fixing rod through a hole below the fixing rod. The upper part of the fixing rod is sleeved with a fixing screw rod, and the outer side of the lower part of the fixing screw rod is in threaded connection with the inner side of the upper part of the adjustment nut. According to the invention, accurate adjustment during the pre-installation of the measuring range and in the experimental measurement can be ensured before the measurement of the nanometer optical fiber sensor in a small experimental space, so that the nanometer optical fiber displacement sensor can reach the measuring range of the optimum resolution.

The invention discloses a mirror regulation device for a fast axial flow gas laser, which comprises a fixed plate, a mirror regulation plate and a mirror room, wherein the fixed plate is fixed on an end plate of a resonant cavity of the laser; the mirror regulation plate is arranged on the fixed plate; the mirror room is arranged on the mirror regulation plate; a lens is arranged in the mirror room; a gas curtain pressure cover is arranged on the mirror room; the mirror regulation plate is connected with a screw hole of the fixed plate by long screws; differential screws and matched screw rods are arranged on the mirror regulation plate; the differential screw is in threaded connection with the mirror regulation plate; the front end of the matched screw rod is in threaded connection with the interior of the differential screw, and the tail end of the matched screw rod is pressed against a supporting pin fixed on the fixed plate; and the mirror regulation plate is pressed against one side, provided with the supporting pins, of the fixed plate. The mirror regulation device has the characteristics of stable performance, mounting simplicity and convenience of regulation, and ensures the stability of laser output.

The invention relates to the technical field of metal material fatigue performance test device structures, in particular to a sample fatigue tension and compression loading test device and an installation method. Comprising a sample connecting flange table and an annular structure which sleeves the outer side of the circumference of a sample and is in external thread connection with the outer side of the circumference of the sample, one end of the testing machine connecting flange table is connected with the testing machine, and the other end abuts against the axial end of the sample and is used for transmitting load to the sample; the pressing structure is used for driving the sample connecting flange table to press towards one side of the testing machine connecting flange table, so that the axial end part of the sample is tightly propped against the testing machine connecting flange table, and a thread gap between the sample and the sample connecting flange table is eliminated. The test device is simple in structure and convenient to operate, can well eliminate thread gaps between the sample and all parts, increases the connection rigidity between the sample and all the parts, ensures the resonance of a resonance system of the fatigue testing machine, and has great popularization value.

The invention relates to a fine blanking machine upper die with an adjusting device. The fine blanking machine upper die comprises an upper die body. The upper die body comprises an upper die plate and an upper die device. The upper die adjusting device is arranged in a manner of being connected with the upper die plate and comprises an upper die lifting device and an upper die balance locking device. The upper die lifting device comprises a nut sleeve in threaded connection with the outer wall of the upper die plate. A gear disc is fixedly connected with the nut sleeve. A small gear is in engaged connection with the gear disc. The small gear is mounted at the output end of a downwards-arranged lifting drive motor connected with the top of a fine blanking machine body. The upper die balance locking device comprises a balance locking oil cylinder mounted at the top of the fine blanking machine body, the balance locking oil cylinder is arranged downwards, and a piston rod of the balancelocking oil cylinder is fixedly connected with the center portion of the upper die plate. The fine blanking machine upper die is simple and practical in structure improvement, adjusting operation is convenient, the machining precision is guaranteed, and the good actual use and popularization value is achieved.

The invention discloses a flow guide disc installation method. The method comprises the steps that firstly, the axial distance L between the upper end face of a compression nut and the tooth top face of the upper end of a turbine disc is obtained through size chain calculation when the compression amount of a flow guide disc reaches the preset compression amount M; then, under the condition that the flow guide disc is not installed, the compression nut is made to move by the axial distance L relative to the turbine disc, and transverse marking and longitudinal marking are conducted on the junction between the compression nut and the outer circle face of the turbine disc; the supporting assembly abuts against the pressing nut so that a thread gap between the pressing nut and the turbine disc can be eliminated. Finally, the flow guide disc is axially compressed through hydraulic equipment, meanwhile, the compression nut is rotated through the split wrench, compared with the prior art, a high-torque wrench does not need to be used for screwing the compression nut, and damage to compression nut threads, turbine disc threads and turbine disc end teeth caused by thread friction force is avoided; and the compression amount can be adjusted without repeatedly disassembling and assembling the flow guide disc, so that the mounting quality and efficiency are obviously improved.

The invention discloses a high-temperature low-cycle fatigue test fixture which comprises a chuck body, a piston capable of reciprocating in the chuck body, a connecting rod capable of extending into a high-temperature environment, an ejector rod slidably arranged in the connecting rod and a cooling device, the chuck body is in sealed communication with one end of the connecting rod, and the other end of the connecting rod is connected with a sample connecting piece; a sample piece can penetrate through the sample connecting piece to be in contact with the ejector rod, one end of the piston is communicated with an oil cavity of the chuck body, the other end of the piston is connected with the ejector rod, the periphery of the piston is in sealed connection with an inner cavity of the chuck body, the chuck body is provided with a channel used for supplying hydraulic oil into the oil cavity, and the cooling device can be arranged in the circumferential direction of the chuck body. By using the clamp for the high-temperature low-cycle fatigue test, provided by the invention, a thread gap between the clamp and a material piece can be effectively eliminated in a high-temperature environment and in a mounting process.