34results about How to "Improve jacking efficiency" patented technology

A multilevel speed regulation jack includes an input oil cylinder, an output oil cylinder, and a fluid conduit member between the cylinders. The output oil cylinder includes a cylinder body containing an annular space and a tube piston, which fits in the annular space. A sliding sleeve of the tube piston is movably positioned in the annular space. An annular in-flow oil chamber is formed between the end annular surface of the tube piston and the cylinder body, and a central in-flow oil chamber is formed between the inner central surface of the piston and the cylinder body. The fluid conduit member includes at least two parallel fluid channels connected to the central in-flow oil chamber and the annular in-flow oil chamber, respectively. A control valve in one of the fluid channels opens / closes the channel. The jack can automatically switch between different jacking speeds based on the load sensed by the system and therefore has a high jacking efficiency.

The invention relates to an automatic guiding transportation vehicle and a jacking device thereof, and belongs to the technical field of automatic guiding transportation robots. The automatic guidingtransportation vehicle comprises a substrate, a driving mechanism which is arranged on the substrate, a first rotating shaft which is horizontally arranged on the substrate and connected with the driving mechanism and rotates under the driving of the driving mechanism, and at least one jacking seat which is connected with the first rotating shaft and moves up and down under the driving of the first rotating shaft. According to the jacking device based on the lever effect principle, the magnitude of acting force is adjusted by adjusting the length of a force arm of the acting force; moreover, jacking operation can be realized only by little rotation of the rotating shaft; the power of the driving mechanism is small; the jacking efficiency is high; the jacking structure is labor-saving; andunder the same jacking force, a motor needs less power.

The invention provides a jacking mechanism, a jacking method and a tower crane with the jacking mechanism. The jacking mechanism comprises a climbing frame (11), a first jacking device (12) and a second jacking device (13), wherein the first jacking device (12) is fixedly connected to the climbing frame (11); and the second jacking device (13) is fixedly connected to the climbing frame (11) and enters a jacking readiness state when the first jacking device (12) jacks the climbing frame (11). The first jacking device (12) enters a jacking readiness state when the second jacking device (13) jacks the climbing frame (11), and the first jacking device (12) and the second jacking device (13) alternately jack the climbing frame (11). Jacking efficiency of the jacking mechanism can be effectively improved.

The invention discloses a reinforcing device for a railway turnout area circuit during jacking for a frame bridge. The reinforcing device comprises a transversal beam and a longitudinal beam, wherein the transversal beam is placed right below a sleeper; a longitudinal steel plate is cushioned between the sleeper of a point rail switch part in a turnout area and the transversal beam; the transversal beam is connected with the sleeper by a U-shaped clamp, an overhead rail beam and a cover plate; and the steel plate is tightly clamped between the transversal beam and the sleeper. After the improvements aforementioned are performed for reinforcing the circuit, the steel plate is connected with the sleeper above the steel plate, the transversal beam below the sleeper and the overhead rail beam, so as to ensure that the whole point rail in a point rail range is located on one plane and then the point rail flexibly rotates in the plane and can be normally used; with the adoption of the reinforcing device disclosed by the invention, the situation that the railway turnout point-rail section circuit is reinforced into an integral structure which is stable and reliable can be effectively ensured, and normal use for a turnout during circuit reinforcement and frame bridge jacking construction is ensured, thus meeting the safety requirements of driving, and reducing the workloads of maintenance and repair.

The invention relates to the technical field of hydraulic equipment, and discloses a multi-oil-cylinder synchronous jacking system for a tower crane and the tower crane. The multi-oil-cylinder synchronous jacking system for the tower crane comprises an oil supply main oil path, a first reversing valve, at least two jacking oil cylinders, a first jacking control oil path, a second jacking control oil path and a speed adjusting valve, wherein the speed adjusting valve can control the flow of oil liquid entering the jacking oil cylinders, and accordingly the jacking oil cylinders can synchronously run. The multi-oil-cylinder synchronous jacking system effectively solves the technical problem that oil cylinder jacking of a double- cylinder jacking system is not synchronous, due to great improvement of the synchronous performance, the safety of the jacking system is enhanced, and the service life of guiding wheels is effectively prolonged. The jacking process is smoother, the operation timeis shortened, and efficiency is improved.

The invention relates to a construction method for auger jacking, which includes a screw jacking system. The screw jacking system includes a jacking device, a rotating device, a threaded pipe cap and a multi-section spliceable threaded pipe joint. The outer wall of the threaded pipe joint is Threads are provided, and a plurality of threaded pipe joints are spliced ​​head to tail to form a threaded pipe body, the threaded pipe cap is connected to the front end of the threaded pipe body, and the rotating device is arranged at the rear end of the threaded pipe body for In order to drive the threaded pipe body and the threaded pipe cap to rotate, the jacking device is arranged at the rear end of the rotating device to push the rotating device, the threaded pipe body and the threaded pipe cap forward During construction, there is no need to drill pilot holes, ream holes and discharge soil first, which can simplify the construction process, increase jacking efficiency, shorten the construction period, reduce construction safety and quality risks, reduce pipeline damage and overheating of jacking equipment The risk of damage, economic and social benefits are significantly improved.

The invention relates to a rapid overturning and tightly-abutting mechanism. An installation groove is formed in the top of the installation seat. An overturning block is hinged to the installation seat through small hinge shafts installed on side plates on the two edges of the installation groove. The small hinge shafts are installed on the side plates on the two edges of the installation groove. The overturning block can freely rotate with the small hinge shafts as the rotation center. When the overturning block is overturned to a limiting position, the overturning block abuts against the bottom of the installation groove. The overturning block is provided with a pin hole. A tightly-abutting shaft is assembled in the pin hole and can axially and freely move in the pin hole. A screwing-down handle is connected to threads at the left end of the pin hole in a threaded manner. The right end of the screwing-down handle is connected with the tightly-abutting shaft. The right end of the tightly-abutting shaft is used for tightly abutting against a workpiece and locating the workpiece. An overturning frame is hinged to the installation seat through hinge shafts. The hinge shafts are installed on the installation seat. The overturning frame can freely rotate with the hinge shafts as the rotation center. When overturning to the limiting position upwards, the overturning frame presses the overturning frame without exerting force. The rapid overturning and tightly-abutting mechanism is convenient to operate and capable of reliably and tightly abutting against the workpiece, rapidly leaving a workpiece machining area, expanding the machining range and shortening the operation time.

A rolling supporting type sealing device for an intermediate jacking station of a rectangular shield tube jacking machine comprises a supporting wheel device and an adjustable sealing device. The supporting wheel device and the adjustable sealing device are both arranged on a step face at the tail portion of a front casing, and the supporting wheel device and the adjustable sealing device are respectively fixed to the two ends of a blocking plate in a rear casing. The supporting wheel device comprises an external slide rail, a shield seal, a mandrel, an inner sliding beam, a stopping sealing cover and a puller bolt, wherein a supporting wheel is arranged on the inner sliding beam through the mandrel, the inner sliding beam is surrounded by the external slide rail, the stopping sealing cover is fixed to the external slide rail, and the puller bolt penetrates through an internal thread of the stopping sealing cover and is tightly attached to the top of the inner sliding beam. The supporting wheel device can roll relative to the tail portion of the front casing and can effectively guarantee the gap between the tail portion of the front casing and a foundation ring. Thus, the stability of the compression amount between the shield seal and the tail portion of the front casing is guaranteed, the service life of the shield seal is prolonged, the fitting degree between the jacking direction and the tunnel axis is improved, and the jacking efficiency is improved.