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

The invention discloses an inclined angel adjusting device. The invention comprises a first driving unit which is fixed on a base, a second driving unit, and a bearing unit which is arranged between the first driving unit and the second driving unit. The first driving unit comprises a first sliding bottom which can be moved reciprocally along a first horizontal direction, the second driving unit comprises a second sliding bottom which can be moved reciprocally along a second horizontal direction, and the bearing unit comprises a bearing plate which can be driven by the first sliding bottom and the second sliding bottom, a connecting rod which is fixed on the bearing plate, a group of rotating components which are connected with the connecting rod, and a group of adapter plates which are used to connect the connecting rod and arrange a balancing target. The invention can adjust undependably inclined angles in the first horizontal direction and the second horizontal direction, and thereby the invention is provided with a property for finishing adjusting work rapidly.

The invention relates to a method for producing a screw element (1) having a first outside thread section (3) and having a second outside thread section (5), wherein the first and the second outside thread sections (3, 5) are positioned relative to one another such that a braking torque results upon screwing the two outside thread sections (3, 5) together with an inside thread element (13). According to the invention, the outside thread sections (3, 5) are positioned in the axial direction and / or in the circumferential direction by a defined relative adjustment of said outside thread sections(3, 5).

The invention discloses an inclined angel adjusting device. The invention comprises a first driving unit and a second driving unit which are fixed on a base and a loading unit which is arranged between the first driving unit and the second driving unit. The first driving unit comprises a first sliding seat which can be moved reciprocally along a first horizontal direction, the second driving unit comprises a second sliding seat which can be moved reciprocally along a second horizontal direction, and the loading unit comprises a loading plate which can be driven by the first sliding seat and the second sliding seat, a connecting rod which is arranged fixedly on the bearing plate, a group of rotating components which are connected with the connecting rod and a group of pinboards which are connected with the connecting rod and used to arrange a balancing target. Thereby the invention can adjust inclined angles in the first horizontal direction and the second horizontal direction separately, and the invention is provided with a property for finishing adjusting work rapidly.

The invention belongs to the field of material performance testing, and relates to a protective device of a reflection type Hopkinson pull rod test sample, and an experimental method. The protective device comprises an inner sleeve and an outer sleeve; a groove is formed in the single side of each of the inner sleeve and the outer sleeve; the cross section of the bottom of the groove is semi-circular, and the diameter and the groove width are equal; the external thread is formed on the outer surface of the inner sleeve and is connected with the internal thread at the position of a screw hole of the outer sleeve; and the diameter of the fitting end face of the outer sleeve and a working rod is equal to that of the working rod. According to the protective device of the reflection type Hopkinson pull rod test sample, and the experimental method, the experimental error generated by threaded gap in the stretching direction of the reflection type Hopkinson pull rod equipment is eliminated, the accuracy of the experimental result is improved, and operation is convenient and rapid.

The invention relates to the technical field of power transmission lines, in particular to a splicing type ceramic insulator with a reinforcing rib structure, comprising a base, a mounting foot is fixedly installed on the base, a screw rod is fixedly installed on the base, and a screw rod is threadedly connected to the base The connection unit is fixedly installed with a spring, the connection unit is hinged with a reinforcing rib, and the reinforcing rib is hinged on the slider, the slider is slidably connected in the chute, and the connection unit is connected The insulator monomer is fixedly connected, and the insulator monomer is provided with a mandrel; the insulator is mainly composed of insulator monomers spliced ​​one by one, and its length can be controlled within any range, and the splicing is very convenient, using memory alloy material. The pressure rod is assembled at a high temperature, and can be firmly connected after returning to normal temperature. It is impossible to reach the deformation temperature of the memory pressure rod under the normal use state of the insulator, which ensures the safety of the insulator.

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 discloses a high temperature tensile fatigue test fixture for a panel test piece and a method. The clamping for the panel test piece in a high temperature test is realized, so that the tensile fatigue test for the panel test piece can be performed under a high temperature condition. A hydraulic chuck of a fatigue machine is used for clamping an optical rod end of a central shaft and is connected with a connecting rod through a sleeve; a fixing nut is arranged on the central shaft; the fixing nut is used for limiting the downward movement of the sleeve; the connecting rod is fixed with the sleeve through a screw; the connecting rod is in threaded connection with a wedge-shaped chuck body; the central shaft passes through a through hole in the middle of the connecting rod; a shaft end is connected with a guiding platform; the guiding platform is located in a groove between two wedge-shaped clamp blocks and is used for guiding the wedge-shaped clamp blocks to move up and down; the test piece is clamped by the wedge-shaped clamp blocks in the wedge-shaped chuck body; the bottoms of the wedge-shaped clamp blocks are propped by the top end of the guiding platform; the two sides are in contact with the wedge-shaped plane in the wedge-shaped chuck body; the upwards movement of the wedge-shaped clamp blocks is limited. The high temperature tensile fatigue test fixture can meet the requirement for stably clamping the panel test pieces in various sizes and can realize the single-shaft tensile fatigue under the high temperature condition.

The invention discloses a gapless thread adjusting mechanism which comprises an adjusting screw, a guide nut, a pretightening nut and a pretightening screw cap. The adjusting screw is cylindrical, an external thread is processed on the outer surface of the adjusting screw, the guide nut is placed outside the adjusting screw in a sleeved manner, an internal thread matched with the external thread of the adjusting screw is processed on the inner surface of the guide nut, each of two ends of the guide nut is a conical face, a deformation groove is formed in each of two end faces of the guide nut, the pretightening nut is placed outside the guide nut in a sleeved manner, an internal thread is processed on the inner surface of one end of the pretightening nut, the other end of the pretightening nut is a conical face which is matched with one conical face of the guide nut, the pretightening screw cap is placed outside the guide nut in a sleeved manner, an internal thread is processed on the inner surface of one end of the pretightening screw cap, the other end of the pretightening screw cap is a conical face which is matched with the other conical face of the guide nut, and the internal thread of the pretightening nut and the external thread of the pretightening screw cap are in matched connection to enable the guide nut and the adjusting screw to be positioned in an inside cavity formed by the pretightening nut and the pretightening screw cap.

The invention provides an electronic expansion valve, which comprises: a valve body; a rotor arranged in the valve body; a nut part arranged in the valve body, and the rotor is sleeved on the outside of the nut part; a screw rod is arranged on the nut part , the screw rod is threadedly connected to the nut part, and the rotor is fixedly connected to the screw rod; the first preload spring is arranged in the valve body, the first preload spring is sleeved on the nut part, and the first end of the first preload spring is connected to the rotor, The second end of the first pre-tightening spring is arranged on the nut part, and the first pre-tightening spring is used for providing axial pre-tightening force to the rotor. The technical solution provided by the present application can solve the problem of high noise when the electronic expansion valve in the prior art is in use.

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.