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2451 results about "Jackscrew" patented technology

A jackscrew, or screw jack, is a type of jack that is operated by turning a leadscrew. It is commonly used to lift moderately heavy weights, such as vehicles; to raise and lower the horizontal stabilizers of aircraft; and as adjustable supports for heavy loads, such as the foundations of houses.

Liquid nitrogen pump power end assembly

The invention provides a liquid nitrogen pump power end assembly. The liquid nitrogen pump power end assembly comprises a crankshaft box assembly. The crankshaft box assembly is correspondingly connected with crosshead shell assemblies. Lubricating systems are correspondingly arranged between the crankshaft box assembly and the crosshead shell assemblies. The liquid nitrogen pump power end assembly adopts split type module combination of the crankshaft box assembly and the crosshead shell assemblies to be assembled, a crankshaft box is designed into a welding type, crosshead shells are designed into a casting type, compared with inblock casting or overall welding, the structure is simple and compact, existing machining manners are considered, machining, manufacturing, assembling, repairingand maintaining are facilitated, crossheads are provided with threads for connection and can be connected with fluid ends with different specifications on the market to play a role in transmitting power, a crankshaft adopts a split type structure that a straight shaft and multiple eccentric wheels are connected through flat keys, the crankshaft overall machining difficulty is lowered, crosshead hinge pins are provided with jackscrew holes, by means of jackscrew fixing, axial floating of hinge pins can be eliminated, the lubricating system can protect movement members, and the service life ofeach movement member is prolonged.

Indoor stretching-shearing testing device for anchor rod

The invention relates to an indoor stretching-shearing testing device for an anchor rod, belonging to the technical field of geotechnical engineering. The device comprises a counterforce frame, a horizontal loading system, a lower shearing box, a vertical loading system, a horizontal guide rail system, an upper shearing box and a limit device. Due to the structure design of the horizontal guide rail system, the shearing movement of the upper shearing box along the horizontal loading direction is realized and a friction resistance in a shearing process can be effectively reduced. A first vertical loading jack and a second vertical loading jack in the vertical loading system are connected with the same hydraulic control system, thus a test anchor rod can always bear a vertically upward axial stretching force in the vertical loading process. By the indoor stretching-shearing testing device for an anchor rod, a shearing damage test of the anchor rod under different axial drawing forces can be realized and the defect that a conventional indoor stretching-shearing testing device for an anchor rod is only capable of performing a pure-stretching test is overcome; and the indoor stretching-shearing testing device for an anchor rod is of great importance in acquiring stretching-shearing damage test data of the anchor rod and understanding a damage mechanism of the anchor rod under a stretching and shearing comprehensive function.

Converter for converting a conventional car jack into a transmission jack

A converter allows a user to convert a conventional car jack from a non-specialized, general service variety into a specialty transmission jack. The car jack has a low, wheeled frame; a handle; a boom extending between a base end pivoted to the frame near the handle and an opposite end formed with a seat portion; and a hydraulic cylinder stretching between the frame and the boom which is actuated by pumping the jack handle to raise the boom. The seat portion of the boom is formed with a socket. The car jack conventionally is provided with a conventional cup having a stem which allows removable seating in the socket of the jack's boom. The converter head has a base plate defining a plane; a stem beneath the base plate for removable seating in the socket of the jack's boom; four or so arms extending between a butt end and a tip end; and cap screws threaded through the tip end of each arm. The cap screws allow adjustment in length and provide upper contact ends for propping a vehicle transmission thereon. The arms have slots in them and are bolted to the base plate by these slots such that the tip ends can be adjustably moved and locked into located in various positions substantially in the plane of the base plate. Wherein swapping back and forth between the cup and the converter head allows conversion of the jack into the specialty transmission jack.

Construction method for lifting arch structure in zero-deformation state

ActiveCN102777043AReduce or even eliminate horizontal thrustHigh precisionArched structuresVaulted structuresButt jointArchitectural engineering
The invention discloses a construction method for lifting an arch structure in a zero-deformation state. The construction method specifically comprises the following steps: 1, sectioning a large-span arch structure into floor arch structures and a lifting construction unit; 2, building up a support bed jig, splicing and assembling the lifting construction unit in situ and simultaneously installing the floor arch structures; 3, installing horizontal steel strands, horizontal jacks and tensioning the horizontal jacks to tension the horizontal steel strands; 4, building up lifting frames, installing lifting jacks and vertical lifting steel strands; 5, alternately tensioning the horizontal steel strands and the vertical lifting steel strands level by level so that the lifting construction unit is separated from the support bed jig; 6, lifting the lifting construction unit to a preset height to be in butt joint with the floor arch structures at two sides, thus forming the large-span arch structure; and 7, unloading and disassembling the horizontal jacks, the horizontal steel strands, the lifting jacks, the vertical lifting steel strands and the lifting frames level by level to finish the construction. The construction method has the advantages of high construction accuracy, high quality, reliable safety and low-cost construction measures.

Mechanical screw jack having stroke limiting nut

Disclosed herein is a mechanical screw jack comprising: a housing; a mechanical jack stroke limiting nut connected to the housing, the nut having a nut wall, the wall defining an interior female threaded surface and an interior screw travel limiting surface located adjacent to the interior female threaded surface; and a mechanical jack screw having an externally threaded male surface for threadably engaging the interior female threaded surface of the mechanical jack stroke limiting nut and a disruption; wherein the unthreaded screw travel limiting surface is capable of interferingly engaging at least a portion of the disruption to prevent over travel of the threaded screw. A method of limiting screw travel in a mechanical screw jack is also disclosed. Advantageously, screw travel is limited such that a user can over torque the screw, such that the screw can travel with respect to the nut without damaging the threaded portion of the nut. The invention increases mechanical screw jack life and reduces the likelihood of separation of such mechanical jacks into their component parts during repeated and vigorous use. The invention further reduces, or substantially eliminates the likelihood of a user experiencing any residual torque effect which can cause a screw jack to lock up during repeated use.

Construction method for quickly assembling and disassembling guy cable of stayed-cable bridge

InactiveCN101509231AQuick releaseRestoring Safe Operations FunctionsBridge erection/assemblyPunchingPull force
The invention relates to a construction method for demounting a cable-stayed bridge fast. An anchor is hard to be removed under the condition that a stayed cable has cable tension, a special tool is used for transforming the stress of an upper anchor ring, a cable and a lower anchor head into zero, then an upper anchor head is cut by compulsion, the cable is chopped up, and the lower anchor head is removed for saving the anchor-removing time, so as to change cables fast. A punching tensioning jack is installed at an anchor pipe opening of the cable. A tension rod is arranged in the jack. The tension rod tensions after penetrating into a tool anchor ring. The tool anchor ring is screwed into the tail end of an anchor head to replace an old anchor ring, and the old anchor ring is taken out by cool cutting. The jack is moved to the tail of the tension rod by the repeated tension and release of the tool anchor ring to ensure that the cable still has 30 to 40 tons of tension. Two sets of cable clamps are used for clamping two ends of the cable to be chopped up. A windlass pulley set is connected between the cable clamps. The pulley set is frapped to transform the internal force of the cut section of the cable into zero and chops the cable. A hoisting apparatus is used for taking out the cut cable on a tower. A hollow drill rod is used for drilling concrete or epoxy mortar in a cable anchor pipe at the end of a beam. The punching tensioning jack is used for pulling out the anchor head by compulsion.
Owner:周孝余 +5

Test apparatus and method for geotechnical engineering side slope multi-direction loading

The invention discloses a test apparatus and a method for geotechnical engineering side slope multi-direction loading. The test apparatus comprises a steel frame, a rotation shaft support, a horizontal loading jack, a vertical loading jack and an inclined loading jack, wherein the steel frame is connected with the rotation shaft support, the bottom inside the steel frame is provided with a side slope bottom support plate, one side of the steel frame is provided with a side slope vertical retaining wall, one end of the horizontal loading jack is connected with a horizontal loading reaction wall, the other end is connected with the side slope vertical retaining wall, the horizontal loading reaction wall is connected with the rotation shaft support, the bottom of the side slope vertical retaining wall is matched with the upper surface of the side slope bottom support plate, the vertical loading jack is connected with a vertical loading reaction frame above the steel frame, one end of the side slope bottom support plate and the rotation shaft support form a hinged connection so as to relatively rotate, and the other end is connected with the inclined loading jack. According to the present invention, test requirements are met, test efficiency is increased, comprehensiveness is strong, and test operation is convenient.

Vertically adjustable table

An adjustable height table includes a base frame, a slider frame assembly, a generally planar support surface and a lifting mechanism. The main portion of the base frame is formed by welding three tubular components to form an H-shape. Each of the end portions of the H-shape include a mounting to support a swiveling locking castor. Above each castor there extends from the H-shaped main portion, a vertically extending tubular post. The slider frame assembly preferably includes an H-shaped main portion formed of three tubular members. Four vertically extending hollow tubular column members are attached to the H-frame so that they may telescopingly engage the four vertically extending posts of the base frame. A generally planar support surface is attached to the top of the four vertically extending columns located on the slider frame. Located between the central tube of the H portion of the base frame and central tube of the slider frame assembly, there is located a lifting mechanism, preferably a hydraulic jack or a pair of electric motors. This jack can be actuated by a pedal mechanism to lift the slider frame assembly relative to the base frame. A second pedal is provided in the lifting mechanism to have the slider frame lower at a controlled rate of descent. Additionally an anti-sway bar is provided to prevent the lifting pump pedal from swaying side to side when in use.

Assembly method for principal shaft and gearbox of large aerogenerator

ActiveCN101463804AReduce flipFewer flipping stepsWind motor assemblyWind energy generationWind drivenJackscrew
The invention relates to a method for assembling a main shaft and a gear box of a large-scale wind-driven generator. The assembly steps are as follows: a. the gear box is horizontally arranged on a rack to cause the shaft hole of the main shaft of the gear box to be horizontal, and a hole which relatively penetrates the shaft hole of the main shaft is arranged on the gear box; b. the main shaft is horizontally lifted to target at the installation position of the gear box; c. an overhead travelling crane is adjusted to cause the main shaft to be coaxial with the shaft hole of the gear box; d. a pull rod penetrates the hole of the main shaft and the hole on the shaft center of the gear box, and a fixed block member is underlaid under one end of the pull rod extending out from the main shaft; e. the other end of the pull rod, which extends out from the gear box, is sheathed with a jack, and is provided with a fixing member; f. the jack is driven to extend, and on the premise that both ends of the pull rod are fixed, the extension of the jack can pull the main shaft into the gear box; g. after being pulled into the gear box, the main shaft is fixed on the gear box by a locking ring; h. the main shaft is well supported by the support, and hanging belts are removed; and i. the fixing member and the jack are dismounted, the pull rod is pulled out of the main shaft and the gear box, and finally, the entire assembly process is completed.
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