Disclosed is a welding robot for welded pipe machining. The welding robot for welded pipe machining comprises supporting assemblies, adjustable cantilevers, a welding head and driving wheels. Each supporting assembly comprises a supporting roller, a fixed plate and a base plate. The base plates are movably connected to the surface of a workbench, and the bottom of the workbench is fixedly arrangedon a machine frame. Sliding sleeves are fixedly arranged at the bottoms of the base plates and connected to a lead screw in a threaded mode. One end of the lead screw is connected with the output endof a stepping motor which is fixedly arranged on one side of the machine frame. The three adjustable cantilevers are arranged. Each adjustable cantilever comprises a supporting beam and a hydraulic cylinder. The supporting beams are fixedly arranged on the workbench, and the hydraulic cylinders are fixedly arranged on the supporting beams. The welding head is installed on one adjustable cantilever. The driving wheels are installed on the other two adjustable cantilevers through supports, and motors are fixedly arranged on the supports. By the adoption of the welding robot for welded pipe machining, the distance between the supporting assemblies is adjusted so that the welding robot can adapt to welded pipes with different diameters; and the welded pipes are conveyed by the use of the driving wheels, the welding robot is not limited by the lengths of the welded pipes, and therefore the welding efficiency is improved.

Welding robot for welded pipe machining

The invention relates to an acoustic structure and a design method thereof. The acoustic structure includes a perforated plate layer, a resonance type metamaterial layer and a back plate layer which are sequentially disposed, wherein a first cavity is formed between the perforated plate layer and the resonant type metamaterial layer, a second cavity is formed between the resonant type metamateriallayer and the back plate layer, a first resonant sound absorber is formed between the perforated plate layer and the first cavity, a second resonance sound absorber is formed between the resonance type metamaterial layer and the second cavity, if the second resonant sound absorber is in a resonant state, the vibration response amplitude of the back plate layer is close to zero. The acoustic structure is advantaged in that the acoustic structure is simple and thin in structure and is easy for assembling and maintenance.

Acoustic structure and design method thereof

The invention relates to the technical field of injection mold production, in particular to hoisting equipment of an injection mold. The hoisting equipment comprises a hoisting mechanism, a portal frame, a traveling mechanism and a position adjusting mechanism, the portal frame comprises a top plate and two side plates in spaced arrangement, the top plate is horizontally arranged at the tops of the side plates, a supporting plate in horizontal arrangement is arranged between the side plates and is of a cuboid structure, and the position adjusting mechanism is arranged at the top of the supporting plate. The hoisting mechanism comprises an anti-shaking component, a hoisting component and a lifting plate in horizontal arrangement. The hoisting equipment has the advantages that the injectionmold which is hoisted can be made to move in the length direction of a sliding rail through a transfer component, so that the injection mold can be adjusted to a proper position; the injection mold which is hoisted can be clamped through the anti-shaking component, so that impact of shaking of the plastic injection in the air on hoisting operation of a worker is avoided.

Hoisting equipment of injection mold

A medical oxygen metering instrument metering standard device belongs to the technical field of medical apparatuses. The medical oxygen metering instrument metering standard device comprises an oxygen steel cylinder with cylinder pressure lower than 5MPa, a power supply and an oxygen pipe. The medical oxygen metering instrument metering standard device is characterized in that the oxygen pipe comprises a low-pressure flowmeter calibrating and verifying pipe, a high-pressure floater flowmeter calibrating and verifying pipe, a low-pressure gauge calibrating and verifying pipe with pressure of 0-4MPa, and a middle-and-high-pressure gauge calibrating and verifying pipe with pressure in 4-30MPa; the oxygen steel cylinder is connected with an air inlet; the oxygen pipe is leaded out of an air inlet pressure sensor and is connected with the four calibrating and verifying pipes; and the four calibrating and verifying pipes are connected in parallel. The medical oxygen metering instrument metering standard device has advantages of combining a pressure verification table with a flow standard device, realizing integration and high portability in metering, realizing higher precision, high vibration resistance and higher tilting resistance through advanced electronic equipment, avoiding field assembling, and greatly improving working efficiency and convenience.

Medical oxygen metering instrument metering standard device

The invention provides a low-frequency sound absorber allowing passing of fluid. The low-frequency sound absorber allowing passing of fluid comprises a plurality of sound absorption units, and gaps allowing passing of fluid are formed among the sound absorption units. Each sound absorption unit comprises a hollow pipe body and plate bodies, wherein an opening extending in the axial direction of the pipe body is formed in the lateral wall of the pipe body, and the plate bodies are arranged at the two ends of the pipe body separately to close the two ends of the pipe body. According to the low-frequency sound absorber allowing passing of fluid, the gaps allowing passing of fluid are formed among the sound absorption units, so that application of the sound absorber to a pipeline system and other occasions is realized, absorption of sound waves is realized while fluid passes by, and low-frequency noise is reduced.

Low-frequency sound absorber allowing passing of fluid

The invention relates to an omnidirectional movement control method and walking mechanism. Thewalking mechanism is characterized in that the omnidirectional walking mechanism adopted by the omnidirectional movement control method comprises a rack assembly, a first driving unit assembly, a first motor installing frame assembly, a second motor installing frame assembly, a second driving unit assembly, a box body assembly, a third driving unit assembly, a third motor installing frame assembly, a fourth motor installing frame assembly and a fourth driving unit assembly. According to the omnidirectional movement control method and the walking mechanism, through control of a moving mode of the omnidirectional walking mechanism, a front and back moving movement mode, a right and oblique upward-moving movement mode, a right and oblique downward-moving movement mode, a transversely-moving movement mode, a left and oblique upward-moving movement mode and a left and oblique downward-moving movement mode of the omnidirectional walking mechanism are achieved, and the omnidirectional walking mechanism can walk on the grassland-grade road surface and is simple in structure and ingenious in design.

Omnidirectional movement control method and walking mechanism

The invention discloses a resonant labyrinth silencing method which comprises a resistive labyrinth silencing method, an expanded resistance silencing method and a resonant resistance silencing method. A resonant labyrinth silencing combined apparatus comprises two parts, namely a noise spectrum testing system (101) and a resonant labyrinth silencing device (102), wherein the noise spectrum testing system (101) comprises a noise source (50), a sound level meter (51), a high-speed data acquisition card NI (52), a computer (53), a noise time-domain figure (54) and a noise frequency-domain figure (55); and the resonant labyrinth silencing device (102) comprises a first expansion chamber (2), a second expansion chamber (3), a third expansion chamber (4), a first cylindrical resonant chamber (5), a second cylindrical resonant chamber (6), a third cylindrical resonant chamber (7), and the like. According to the silencing method and the apparatus disclosed by the invention, resistance sound absorption is performed by utilizing the three expansion chambers and the three resonant chambers, and resistive sound absorption is performed by utilizing a porous sound absorbing material, so that the silencing effect is achieved.

Resonant labyrinth silencing method and combined apparatus

The invention discloses a weighing-method-based hydraulic system for calibration of volumetric high-pressure flowmeters, and an experimental method. The hydraulic system of an experimental device consists of a pump source component and a weighing-method flowmeter calibration system component. The opening pressure of a direct-acting overflow valve is adjusted to finish K coefficient calibration of the flowmeters at different pressures; the displacement of a high-pressure variable displacement piston pump is adjusted to finish K coefficient calibration of the flowmeters at different flowrates; a medium of the hydraulic system is replaced to finish K coefficient calibration of the flowmeters at different viscosities. The hydraulic system and the experimental method can finish K coefficient calibration of the flowmeters at different pressures, different flowrates and different viscosities. Instrument manufacturers can provide the released flowmeters with K coefficient calibration values at different pressures, different flowrates and different viscosities, so that users can determine the K coefficients of the flowmeters according to own actual hydraulic systems, and accordingly, the precision of the flowmeters can be improved.

Weighing-method-based hydraulic system for calibration of volumetric high-pressure flowmeters and experimental method

The utility model discloses a remove submerged body frequency object detection's experimental system under water, the utility model discloses an experimental system by underwater vehicle (501), underwater vehicle (502), underwater vehicle (503), surveying vessel basic station, remove submerged body (20) under water and constitute, motion gesture and the data acquisition and the processing of wireless communication control underwater vehicle (501), underwater vehicle (502), underwater vehicle (503) are passed through to the surveying vessel basic station, the utility model discloses a be based on the theoretical experimental method of impedance analysis, adopted underwater vehicle (501), underwater vehicle (502), underwater vehicle (503) as data acquisition's carrier, survey and position discernment the submerged body of the removal under water frequency target of given frequency, the utility model discloses an experimental apparatus has a simple structure, and detection efficiency is high, and the moving target under water of given frequency can not only be surveyed to detection range characteristics far away, in addition can to this under water the moving target carry out the identification.

Remove submerged body frequency object detection 's experimental system under water

The utility model discloses a hydraulic system of high pressure gear meter comprehensive properties experimental apparatus, the utility model discloses a hydraulic system comprises pumping source subassembly, flowmeter dynamic behavior testing system subassembly. Through the output frequence of conditioning signal generator, accomplish the performance experiment of the servovalve switching -over valve under the different input frequency, through adjusting the cracking pressure who directly moves the overflow valve, accomplish the servovalve switching -over valve performance experiment under the different pressure, through adjusting high -pressure plunger variable pump delivery, accomplish the performance experiment of the servovalve switching -over valve of different flows. Through the output frequence of conditioning signal generator, accomplish the dynamic behavior experiment of the flowmeter under the different input frequency, through adjusting the cracking pressure who directly moves the overflow valve, do the dynamic behavior experiment of the high -pressure gear meter under the different pressure, through the regulating variable pump delivery, do the dynamic behavior experiment of the high -pressure gear meter under the different flows.

Hydraulic system of high pressure gear meter comprehensive properties experimental apparatus

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