44results about How to "With preload" patented technology

The invention discloses a crane winding device with a steel wire rope straining mechanism. The crane winding device with the steel wire rope straining mechanism comprises a winding drum part, a motor and a speed reduction system, a one-way bearing is installed in a winding drum, the inner ring of the one-way bearing is matched with a transmission shaft, and the outer ring of the one-way bearing is matched with the winding drum; the steel wire rope straining mechanism is installed on one side of the winding drum and comprises a ratchet wheel, a pawl, a support and a limiting block, the ratchet wheel is connected to an end cap of the winding drum, ratchet wheel slots are formed in the periphery of the ratchet wheel at intervals, the pawl is installed on the support, embedded into the ratchet wheel slots under the action of a compressed spring and meshed with the ratchet wheel slots, the support is provided with an arc-shaped section which is provided with a groove, a brake cable is placed in the groove, one end of the brake cable is fixedly connected with the support, and the other end of the brake cable is connected with a manipulation handle; when the handle is pressed down, the support is made to rotate in the tension direction, the winding drum rotates along with the support to strain the steel wire rope; a torsional spring is installed between the support and a bearing seat, when the handle is loosened, the support returns to the original position under the action of the torsional spring, and the limiting block is installed on the bearing seat to make the pawl break away from the ratchet wheel slots. According to the crane winding device with the steel wire rope straining mechanism, the structure is compact, the design is reasonable, and straining of the steel wire rope is safe and reliable.

The invention provides a preparation method of a low-density carbon / carbon composite cylindrical material. A structure of the low-density carbon / carbon composite cylindrical material is described as follows, from an inner side to an outer side: a support layer is arranged at a most internal side, and a plurality of the carbon felts or the graphite felts and a plurality of the tensioning layers, in an alternating manner, are arranged on the support layer. In the low-density carbon / carbon composite cylindrical material, structural advantages of the supporting layer and the tensioning layers are fully utilized, wherein a wrapping tensile force of carbon wires in the tensioning layers can increase resistance of layering and falling-off of interlamination, so that the cylindrical material totally has a certain pre-tensioning force and is increased in capability of resisting external forces and deformation. A common high-temperature bonding agent is employed during a preparation process so that a service life of the low-density carbon / carbon composite cylindrical material is effectively prolonged and the material is totally increased in utilization rate on the premise of not increasing a cost.

The invention discloses an active pre-fastening safety belt device, and belongs to the technical field of passenger injury protection in vehicle collision accidents. The safety belt device comprises a direct current motor, a transmission system, a coiler and a braid external part; the direct current motor is connected with the transmission system for responding a control signal of an accident pre-fastening device to work; an output shaft of the direct current motor is connected with a planetary gear train of the transmission system; the planetary gear train transmits power to the outer gear of an isolator by a middle idle gear; the isolator is designed into a ratchet structure; a safe coupling sleeve is mounted between the ratchet and a spindle of the coiler so as to transmit the power to the coiler; and one end of the frame of the coiler is provided with an emergency locking device which is sensitive to the placing angle of the safety belt and the pulling-out acceleration of a braid, thus realizing the emergency locking of the active safety belt. The pre-fastening of the safety belt can be finished before an accident occurs, and eliminates the wearing gap of the safety braid, so the restraining performance of the safety belt on a passenger is increased in the collision accident, and the collision injury of the passenger can be obviously reduced.

The invention discloses preloading bolt assembly equipment. The preloading bolt assembly equipment comprises a press machine, a mounting support, a mechanical arm and pressure bars. A piston rod of a pressure cylinder of the press machine drives a movable middle plate of the press machine to move. The mounting support is fixedly connected with the movable middle plate of the press machine. The mechanical arm and the pressure bars are fixedly mounted on the lower portion of the mounting support. A wrench is mounted at the tail end of the mechanical arm. The mechanical arm rotates to drive the wrench to rotate. Pressure of the operating compression amount of a compression spring of the mechanical arm forces the wrench to move to tighten a preloading bolt to be tightened. The preloading bolt assembly equipment discloses by the invention has the functions of high-pressure-intensity preloading and bolt tightening, is full-automatic, suitable for an automatic production line and wide in application range, and can be used preloading assembly of various kinds of assembling components. The invention further discloses a method for assembling bolts by using the preloading bolt assembly equipment.

A bipolar circuit breaker with a display function disclosed by the present invention comprises a circuit breaker shell, a first execution mechanism and a second execution mechanism are arranged at thetwo sides of the circuit breaker shell respectively, and the first execution mechanism and the second execution mechanism are both equipped with the moving contacts. One side of the first executing mechanism and one side of the second executing mechanism are connected with an electric leakage electromagnetic system and a short-circuit electromagnetic system respectively, and the other side of thefirst execution mechanism and the other side of the second execution mechanism are both connected with handles. The first execution mechanism is connected with the electric leakage electromagnetic system through an electric leakage display mechanism, and the electric leakage display mechanism comprises an indication accessory. A first linkage part is arranged between the indication accessory andthe first execution mechanism, an indication piece is connected to the inner side of each handle, and one side of the indication piece is connected with the indication accessory through a second linkage part. According to the present invention, the electric leakage display effect can be achieved when the circuit breaker is switched off due to electric leakage, and the bipolar circuit breaker has the advantages that the circuit board is good in power-off stability, and the circuit breaker is convenient to install.

The invention provides a wind generating set and a transmission shaft system thereof. The transmission shaft system comprises a static part, a rotating shaft, a first bearing and a second bearing, and the rotating shaft is used for connecting a wind wheel of the wind generating set; the side, close to the wind wheel, of the first bearing is arranged between the static part and the rotating shaft, and the side, away from the wind wheel, of the second bearing is arranged between the static part and the rotating shaft; the rotating shaft is arranged on the outer side of the static part in a sleeving mode, the first bearing and the second bearing jointly support the rotating shaft, and the first bearing and the second bearing are both single-row tapered roller bearings. The two single-row tapered roller bearings are adopted to support the rotating shaft, the single-row tapered roller bearings can bear radial and axial combined loads mainly in the radial direction and have pre-tightening force, the bearing capacity of the transmission shaft system is improved, the overall rigidity of the shaft system is good, the structural deformation is small, the requirement of the bearings for the rigidity of the rotating shaft and the static part is lowered, the size of a rotor shaft and the static part is reduced, and the transmission shaft system cost is reduced.

The invention provides a tubular pile welding vehicle capable of being mounted and dismounted quickly and provided with a locking track. The tubular pile welding vehicle comprises the quick locking track, a welding trolley, a control system and an operating handle. The welding trolley comprises a clamping mechanism, and the welding trolley is clamped on the quick locking track through the clamping mechanism. The control system is installed on the welding trolley and connected with the welding trolley. The operating handle is connected with the control system and used for controlling the welding trolley by controlling the control system. According to the tubular pile welding vehicle capable of being mounted and dismounted quickly and provided with the locking track, the welding trolley is clamped on the quick locking track through the clamping mechanism, manual locking is not needed, and the stability in the welding process can be ensured.

The invention relates to a turbocharger bearing sleeve and a turbocharger comprising the bearing sleeve. The bearing sleeve comprises a straight-sleeve-type sleeve body; the sleeve body is provided with an axial hole which is through in the axis direction; the inner sides of the pressing end and the vortex end of the sleeve body are each provided with a bearing positioning hole for containing an angular contact bearing; the diameter of each bearing positioning hole is larger than that of the axial hole; an annular boss is arranged at the bottom of the bearing positioning hole of the pressing end; and the diameter of the annular boss is smaller than that of the corresponding bearing positioning hole and larger than that of the axial hole. A wavy spring gasket is arranged in a hole of the annular boss of the pressing end and makes contact with the outer circle end faces of the angular contact bearings; the wavy spring gasket provides pre-tightening force for the angular contact bearings; and the annular boss limits the movement range of the angular contact bearings.

The invention discloses a sewing device. The sewing device comprises a rack, a sewing machine supported on the rack and a tension mechanism positioned at the feeding side of the sewing machine and used for making a stitching edge of a material to be stitched have certain pre-tension force; the tension mechanism comprises a guide rail supported on the rack in a feeding direction and a clamping mechanism arranged on the guiding rail in a sliding mode and used for clamping one end of the stitching edge tightly. The sewing device can ensure the pre-tension force performed on the stitching edges during stitching, make the stitching edges always maintain flush and reduce the stitching cost.

Heat exchanger valve arrangement, especially for a radiator valve has a valve seat (24), valve element (27), spring element (31) and a pressure reaction apparatus (32), which serves to maintain a constant pressure across the valve, that are joined together by a single connection (33). The whole assembly then forms a single handheld unit that can be inserted into the valve housing.

The invention discloses a thread-off proof fastener for assembling a heat preservation and decoration integrated plate, a wall body structure of an exterior wall dried hanging heat preservation and decoration integrated plate using the thread-off proof fastener and a construction method thereof. The thread-off proof fastener comprises a connecting belt, a fixed part, a positioning part and a distance adjusting mechanism. The fixed part is fixed to one end of the connecting belt and used for being embedded into an exterior wall and fixed to the exterior wall. The positioning part is arranged atthe other end of the connecting belt and comprises an upper clamping part, a lower clamping part, an upper positioning plate and a lower positioning plate, wherein the upper clamping part and the lower clamping part extend up and down and are used for clamping into a corresponding heat preservation decoration integrated plate, the upper positioning plate and the lower positioning plate are horizontal, located inside at intervals, and used for attaching to the end face of the corresponding heat preservation decoration integrated plate, and the lower positioning plate remains horizontal with the bottom of the fixed part. The distance adjusting mechanism is provided with a locking structure, the adjusting end of the distance adjusting mechanism is arranged outside the positioning part, and the distance adjusting mechanism connects the positioning part and the connecting belt and can drive the positioning part to move towards the fixed part. The intensity of a wall body is greatly improved.

The invention provides a wiper shaft assembly structure and an automobile, relating to the technical field of automobiles, comprising a wiper spindle, a sleeve assembly, a wiper rocker arm, a coil spring and an electromagnet. A receiving cavity is provide inside that sleeve assembly, A main shaft of that wiper passes through the receive cavity, and extends along both ends of the sleeve assembly inthe longitudinal direction, A helical spring is positioned within that receive cavity, the end of the electromagnet near the spindle of the wiper, By detecting a collision between a vehicle and a pedestrian at the front of the vehicle, The automobile ECU sends a signal to the electromagnet, and the electromagnet generates an attraction force, the attraction force overcomes the spring force of thecoil spring, and the wiper spindle moves downward under the electromagnetic attraction force of the electromagnet, thereby alleviating the lack of lateral stiffness or poor durability of the supportin the prior art, and is prone to fatigue fracture phenomena; As well as the technical problems of small buffer space, non-repeatability and high replacement cost; It makes a lot of room for pedestrians to play a very good role in protecting.

The invention provides a refrigeration device, an adjustable bottom foot component and an assembly method of the two. The adjustable bottom foot component comprises a foot base, a screw rod and a fixed piece, wherein the foot base and the fixed piece are both provided with thread holes; the screw rod comprises a foot base section, a foot base positioning part and a fixed piece section connected in sequence; the foot base section is in threaded connection with the foot base; the fixed piece section is in threaded connection with the fixed piece; a fixed piece positioning part is arranged at one end, far from the foot base section, of the fixed piece section; the fixed piece positioning part is used for touching the fixed piece and forming pretightening force; and the foot base positioning part is used for touching the foot base and forming the pretightening force. The position relation between the foot base section and the foot base can be adjusted; the position relation between the fixed piece section and the fixed piece can be adjusted; the positioning can be realized; the factory delivery height is determined; and the difficult fall in the carrying process is realized.

The invention discloses a sealing device for secondary sealing of an outward floating roof tank and the outward floating roof tank. The sealing device for secondary sealing of the outward floating roof tank comprises a sealing plate (1) and a pressing device (2), wherein the pressing device (2) comprises a circular arc-shaped steel plate (3), a pressing plate (4), a spring (5) and a supporting plate (6), the pressing plate (4) and the sealing plate (1) are stacked, two ends of the spring (5) are connected with the circular arc-shaped steel plate (3) and the supporting plate (6) respectively, and the spring (5) is in an elongation state and can drive the pressing plate (4) to press the sealing plate (1) through the circular arc-shaped steel plate (3). The sealing device for secondary sealing of the outward floating roof tank can realize equipotential connection of a floating tray and the tank wall of the outward floating roof tank, and can keep tight attachment with the tank wall in a long-term operating process, and thereby guaranteeing safe operation of the outward floating roof tank.

The invention provides a special-shaped hole chamfering deburring device, and belongs to the technical field of machining. The device aims to solve the problems that grinding of an existing electric grinder cannot be flexibly adapted to complex parts, the manual grinding flush precision is low, the working efficiency is low, and the unnecessary waste and the loss are caused in a manual operation mode. The device comprises that the top of a tail seat is rotationally connected with a group of electric grinder mounting seats; the front end of the tail seat is fixedly connected with a group of tension springs; the rear end of the tail seat is fixedly connected with a group of electric grinder limit rods; and a group of floating electric grinders is fixedly connected inside the electric grindermounting seats. The floating electric grinders rotate on the tail seat, so that floating electric grinder heads can grind the more complex parts; the tension springs enable the floating electric grinding heads to rotate along with the parts during grinding, so that the cutting effect is more natural; deburring is convenient and rapid, the work which is difficult to complete by manual and common equipment is replaced; and the production quality of the parts is improved, customer complaints are reduced, and the obvious effects on defective products of repairing burr problems are achieved.

The invention discloses a mechanical sealing device with a self-stirring function for a desulfurization circulating pump. The mechanical sealing device comprises an end cover, a rotating seat shaft sleeve and a rotating seat, wherein a dynamic sealing ring is mounted in the rotating seat, and a rotating ring anti-rotating pin is mounted on the rotating seat in an interference mode;, and a static ring anti-rotating pin mounting hole with the depth of larger than the effective length of the anti-rotating pin is formed in the end cover and corresponds to the static ring anti-rotating pin; a static sealing ring is mounted in the end cover, a push ring is arranged on the outer side of the end cover, the push ring is mounted on the end cover through an elastic pre-pressing connecting assembly, and the push ring has a movement trend in the axial direction under the action of the elastic pre-pressing connecting assembly, so that the static sealing ring is tightly attached to the dynamic sealing ring; and a plurality of stirring teeth are arranged on the outer circumference of the rotating seat. According to the technical scheme, the mechanical sealing device solves the problems of bubble accumulation and poor medium flowing between a rear protective plate and an impeller, heat generated by rotating friction of a mechanical seal can be taken away in time, and the service life of the mechanical seal is prolonged.

The invention provides a hydraulic oil pump assembling device for an oil extraction machine. The hydraulic oil pump assembling device comprises a transmission system, a tightening device and a torque adjusting device; a vertical plate is arranged on the upper portion of a rack; a vertical plate hole is formed in the upper portion of the vertical plate; a motor base is arranged on the side face of the upper portion of the vertical plate; the two sides of a beef tendon flexible shaft are each provided with a second positioning block; a plurality of first positioning blocks are evenly distributed in the middle of the beef tendon flexible shaft; a first ball gear hole is formed in the middle of a first ball gear; a first counterbore is formed in one side of the first ball gear hole; a first ball gear shaft is arranged on the outer side of the first ball gear hole; a second ball gear hole is formed in the middle of a second ball gear; the two sides of the second ball gear hole are each provided with a second counterbore; a third ball gear hole is formed in the middle of a third ball gear; a third counterbore is formed in one side of the third ball gear hole; and the first ball gear hole is rotationally connected with the beef tendon flexible shaft between the second positioning block on the upper side and the first positioning block on the upper portion.

The invention discloses a headset. The headset comprises a headset part, two ear shell parts and an elastic assembly, and the two ear shell parts are arranged at the two ends of the headset part; eachear shell part comprises a first shell and a second shell, the first shell is connected with the headset part, the second shell is located on the side, facing the other ear shell part, of the first shell and is rotationally connected with the first shell, and the rotating axis of the second shell extends in the arrangement direction of the two ear shell parts. The elastic assembly is installed onone of the first shell and the second shell, the other one of the first shell and the second shell is provided with an annular circumferential wall surrounding the rotating axis of the second shell,and the elastic assembly elastically abuts against the annular circumferential wall. The technical scheme of the invention can improve the ability of the headset to adapt to the use requirements of different users.

The invention belongs to the technical field of LED lamps, and particularly relates to an LED ceiling lamp, which includes a suspension mechanism, a lamp panel, and a lampshade. Both the first fixing plate and the second fixing plate in the suspension mechanism of the LED lamp are provided with square fixed lengths. Hole; through the square fixed long hole, it can prevent the installation staff from misaligning the pre-drilled hole and the fixing hole on the LED lamp fixing frame due to some small errors during the drilling process. When fixing, in order to adapt to the The fixing holes cause damage to the fixing frame of the LED lamp, and at the same time, it also avoids that in the process of re-drilling, the new hole and the old hole overlap each other, resulting in the hole diameter being too large, so that it cannot be fixed normally; at the same time, the first fixing of the invention design The plate and the second fixing plate can swing mutually to adapt to holes at different positions through the swing.

The invention provides a refrigeration device, an adjustable bottom foot component and an assembly method of the two. The adjustable bottom foot component comprises a foot base, a screw rod and a fixed piece, wherein the foot base and the fixed piece are both provided with thread holes; the screw rod comprises a foot base section, a foot base positioning part and a fixed piece section connected in sequence; the foot base section is in threaded connection with the foot base; the fixed piece section is in threaded connection with the fixed piece; a fixed piece positioning part is arranged at one end, far from the foot base section, of the fixed piece section; the fixed piece positioning part is used for touching the fixed piece and forming pretightening force; and the foot base positioning part is used for touching the foot base and forming the pretightening force. The position relation between the foot base section and the foot base can be adjusted; the position relation between the fixed piece section and the fixed piece can be adjusted; the positioning can be realized; the factory delivery height is determined; and the difficult fall in the carrying process is realized.

The invention discloses a reversal valve of a steering hydraulic system of a bulldozer. The reversal valve is characterized in that a scarifier operating valve core mounting hole, a dozer blade operating valve core mounting hole and corresponding oil holes are formed in a valve body; a scarifier operating valve core is arranged in the scarifier operating valve core mounting hole in a penetrating manner; a dozer blade operating valve core is arranged in the dozer blade operating valve core mounting hole in a penetrating manner; the left end of the scarifier operating valve core is positioned through a second positioning seat; the second positioning seat is internally provided with a spring sliding seat; the spring sliding seat is internally provided with a second spring; a stop block is arranged at the left end of the second positioning seat; the left end of the dozer blade operating valve core is positioned through a first positioning seat; the first positioning seat is internally provided with a spring and a positioning sleeve; the positioning sleeve is arranged at the left end of the spring; a pressing cover is arranged below the positioning sleeve, and is internally provided with a pressing seat; and the pressing seat is internally provided with a first spring and a steel ball. The reversal valve has a servo function, and is simple and flexible to operate, and compact in structure.

The invention provides a pipe pile welding vehicle with fast assembly and disassembly with a locking track, comprising: a quick locking track, a welding trolley, a control system and an operating handle; the welding trolley includes a clamping mechanism, and the welding trolley passes through the The clamping mechanism is clamped on the fast locking track; the control system is installed on the welding trolley and connected with the welding trolley; the operating handle is connected with the control system for controlling The control system controls the welding carriage. The pipe pile welding vehicle with fast assembly and disassembly with locking track of the present invention clamps the welding trolley on the fast locking track through the clamping mechanism, and can ensure the stability in the welding process without manual locking.