33results about How to "Stable preload" patented technology

The invention relates to a method and device for joining members. According to the method of the invention, at least one of the members (12, 14) is made of fibre reinforced plastics, and a member complex is joined by friction welding of the members (12, 14) using an initially separate friction element (20), wherein the friction element (20) forms a fixed composition part of the member complex during the welding and friction process. The device according to the invention includes a support device (16) for fixing the members (12, 14) and a drive device (18) for rotating and pressing the friction element (20), wherein the force applied to the member (12, 14) by the support device (16) can be adjusted independent of the force applied to the friction element (20) by the drive device (18).

The invention relates to the technical field of structural thermal noise composite environment tests, in particular to a device and method for mounting a high noise resistance quartz window under a high temperature environment. The mounting device comprises brackets (3), thermal insulation felt (4), metal shock pads (5), fastening bolts (6) and gland nuts (7). The brackets (3) are U-shaped groove components and are arranged on the upper side and the lower side of the window of a mounted object (1), and the two brackets (3) with opposite openings are mounted to be used for constraining the quartz window (2). The thermal insulation felt (4) is arranged between the quartz window (2) and the brackets (3) in a cushioned mode. In the horizontal direction, the metal shock pads (5), the fastening bolts (6) and the gland nuts (7) are used for fixing the quartz window (2). By the adoption of the device and method, the mounting stress caused by thermal deformation of a traveling-wave tube can be relieved, meanwhile, stable pretightening force can be provided under the high temperature environment, and the integrity of the thermal noise test system is guaranteed.

The invention provides a lateral pressure spiral spring which is formed by rotating and bending a cylindrical body wound by using linear materials, wherein the axis of the cylindrical body is a central line of the spring, and basic parameters include a material linear diameter, an external diameter of the spring and a spiral angle; and the cylindrical body can be wounded into a cylinder or a ring shape connected end to end. The lateral pressure spiral spring is characterized in that the spiral angle is a variable. The front half circle of the spiral angle is a positive spiral angle, and the rear half circle of the spiral angle is a negative spiral angle; a transitional surface of break points of the spiral angle is formed between the front half circle and the rear half circle, and the absolute value of the positive spiral angle is larger than that of the negative spiral angle; and the spring is in a spiral raising structure as a whole. The spring can be applied to various mechanical application fields and particularly to the sealing field, is wide in stress range and can provide multidirectional stress compensation for elements, the stress compensation direction can be adjusted at any time along with the change of an external acting direction, and the spring can still provide enough stress compensation when pressure stress is not on the same horizontal surface but forms a certain angle with the horizontal surface.

The invention discloses a multi-piece valve disk (T, T'), in particular a multi-piece valve disk (T, T') of a sliding and/or seat valve (V). In the multi-piece valve disk (T, T'), a ring seal (R, R') with an elastic sealing ring (17) with an external sealing zone (31) is placed in a ring groove (N) of the valve disk (T, T') onto a dimensionally stable backup ring (16, 16'), and where an elastic restoring region (33) effectively positioned between the backup ring (16, 16') and the external sealing zone (31) is arranged in the backup ring (16, 16'), the restoring region (33) being embodied in one piece with the sealing ring (17) of its material adjacent to the external sealing zone (31) of the sealing ring (17).

The invention discloses a gyro motor bearing unit and relates to the field of the design technologies of the bearings. The gyro motor bearing unit comprises a step shaft (12), a bearing A (19), a bearing B (20), an oil storage ring (16), an oil storage ring lining (18), an elastic lining (1) and a U-shaped clamping ring (10), wherein the bearing A and the bearing B are arranged on two sides of the middle part of the step shaft (12); the elastic lining and the U-shaped clamping ring are arranged between the bearings A and B; the U-shaped clamping ring is arranged between the elastic lining and the bearing A; the oil storage ring is arranged in a groove body which is formed in the middle part of the inner surface of the elastic lining; an oil storage ring lining is arranged between the oil storage ring and the groove body of the elastic lining. The gyro motor bearing unit overcomes such defects of the conventional gyro motor bearing unit as low rotation precision, short service life, low reliability and poor installation qualified rate; and the performance of the gyro motor bearing unit can be effectively improved.

The invention relates to the technical field of MPCVD equipment, in particular to a tensioning device for an MPCVD, and solves the problems of incapacity of timely measuring and adjusting of tensioning force of a connecting rod in MPCVD equipment in the prior art. The tensioning device comprises a reaction cavity, a waveguide cavity and a connecting rod, a tensioning device body located below thewaveguide cavity is further mounted on the connecting rod, the tensioning device body comprises a tensioning assembly, an elastic element, a pallet, a pre-tightened piece, a tensioning piece and a weighing sensor, and the weighing sensor is electrically connected to a display. According to the tensioning device for the MPCVD, as the change of the tensioning force of the elastic element is caused by the change of the tensioning force of the connecting rod, the expected force of the elastic element can be measured at any time through the weighing sensor in the tensioning device body and displayed on the display, the change of the tensioning force of the connecting rod can be viewed at any time through the display, and the change of the tensioning force of the connecting rod can be measured timely, so that the tensioning force of the connecting rod can be adjusted timely.

The invention discloses a mining self-pressurization intelligent wireless anchor cable dynamometer and a use method thereof, and aims to solve the problems existing in the use of an existing anchor cable dynamometer. The wireless anchor cable dynamometer comprises an oil cylinder outer body, a telescopic body, a first sealing ring, a three-way joint, a gauge outfit, an intelligent tray and a high-pressure oil pipe. The pressure release valve is arranged on the oil cylinder outer body, and the pressure release function can be achieved under the action of blasting impact; the manual pump pressurizes the interior of the oil storage cavity of the oil cylinder outer body through the three-way joint, and when the designed pre-tightening force is reached, the oil tightening valve can be rotated to seal oil into the oil storage cavity; a plurality of modules are arranged in the meter head, so that data acquisition, conversion and recording can be realized, and wireless transmission can be realized. The wireless anchor cable dynamometer is suitable for long-term monitoring and early warning of the axial force of the anchor cable in the coal mine tunnel, has the advantages of impact resistance, the stable test result, convenient data recording and transmission and convenient pressurization, and can analyze the stress conditions of the tray in different directions so as to better guide supporting construction and evaluate and check the supporting effect.

The invention provides a method and a system for intelligently adjusting the pre-tightening force of a bearing of an electric spindle. According to the method and the system, a positioning guide blockis arranged in a spindle device and is hydraulically driven to move and drive a bearing outer ring to move, and therefore the contact angle of the bearing inner ring and the bearing outer ring can beadjusted, and the effect of adjusting the pre-tightening force of the bearing is achieved. Meanwhile, an optimal adaptation data table of different materials and pre-tightening force is established in advance, the pre-tightening force which most adapts to the material can be automatically selected based on the material of a to-be-machined workpiece, and the pre-tightening operation of the bearingis automatically completed, and thus the magnitude of the pre-tightening force of the bearing can be matched with the type of a machined plate. Besides, the method and the system provided by the invention can judge the actual abrasion condition of the bearing by detection of the movement distance of the bearing outer ring and the current pre-tightening force of the bearing and combination with the theoretical relation between the position of the bearing outer ring and the pre-tightening force of the bearing; and the oil supply amount can be properly corrected based on the abrasion condition of the bearing so as to make up the influence caused by long-term abrasion of the bearing.

The invention discloses a shaft end sealing mechanism. The shaft end sealing mechanism comprises an equipment end plate, a sealing base, a lock nut and a compression sleeve, wherein the sealing base is arranged on the equipment end plate; a rotating shaft is arranged inside the sealing base in a matching way; a sealing material is arranged between the inner cavity of the sealing base and the rotating shaft; the lock nut is arranged on the sealing base; the compression sleeve is arranged on the rotating shaft and is positioned between the sealing material and the lock nut; the lock nut is rotated to drive the rotating shaft to move upwards along the sealing base; and the sealing material is extruded and tensioned by the compression sleeve to realize a shaft end sealing function. According to the shaft end sealing mechanism, an integral spiral pre-tightening structure is adopted together with a ball-type one-way non-return structure, so that rapid pre-tightening and timely locking can berealized by only rotating the lock nut. The tensioning system can keep stable pre-tightening force, and has an automatic compensation function, so that the service life of the sealing material is prolonged greatly.

The invention provides a water purifier. The water purifier comprises a pressure stabilizing valve, a filter system, a safe pressure barrel and a water faucet, wherein the pressure stabilizing valve, the safe pressure barrel and the filter system are sequentially communicated, and the filter system is further communicated with the water faucet; the safe pressure barrel comprises a casing, a water inlet and outlet joint, a water storage liner, a prepressing cavity and a tap water outlet and inlet joint, the water inlet and outlet joint is arranged at the upper end of the casing, the tap water outlet and inlet joint is arranged on one side of the casing, the water storage liner is arranged in the casing, the water inlet and outlet joint is connected with the water storage liner, the prepressing cavity is formed between the inner wall of the casing and the outer wall of the water storage liner and communicated with the tap water outlet and inlet joint, the water inlet and outlet joint is communicated with the filter system, and the tap water outlet and inlet joint is communicated with the pressure stabilizing valve. According to the water purifier, the potential safety hazards caused by air leakage, air addition and compressed air explosion in complex technology of a production process as well as in the use process are avoided, and the available volume of water storage of the pressure barrel is greatly increased.

A sealing structure of a valve comprises a valve body, a valve element, a sealing ring, an installation support, an elastic ring, a wave spring and a pressure applying part. The valve element is rotationally arranged on the valve body. The sealing ring is installed on the installation support, and the installation support is provided with a fluid through hole in the axial direction. The elastic ring is arranged between the installation support and the wave spring, the front end surface of the elastic ring is in sealed contact with the rear end of the installation support, and the outer peripheral surface of the elastic ring is in sealed contact with the inner surface of the valve body. The wave spring is in a corrugated pipe shape, and the front end of the wave spring abuts against the rear end of the elastic ring. The pressure applying part abuts against the rear end of the wave spring so as to apply axial pressure to the wave spring, and the axial pressure is transmitted to the sealing ring through the elastic ring and the installation support so that the sealing ring can be tightly attached to the surface of the valve element. A good sealing effect can also be maintained in a high-low temperature environment and under the condition that assembly and part size accumulative deviation exists.