12results about How to "Reduced compressive strength" patented technology

This invention provides a sandwiched pressure hull structure and its processing method, relating to an underwater vehicle structure, including an inner hull, an outer hull, and an intermediate sandwich layer located between the inner and outer hulls. The intermediate sandwich layer includes hollow glass microspheres, reinforcing fibers, and epoxy resin. The spherical hollow glass microspheres and reinforcing fibers are uniformly mixed in the epoxy resin and placed in a fluidized state between the inner and outer hulls. After vacuum curing, they form a buoyancy material located between the inner and outer hulls. This invention addresses the problems of insufficient load-bearing capacity and low specific strength and specific stiffness of the pressure hulls of underwater vehicles in the prior art.

The utility model discloses a shell assembly machining punching device which comprises a bottom plate, a T-shaped support is fixedly connected to the middle of the rear side of the bottom plate, an embedding seat is fixedly embedded in the top end of the rear side of the T-shaped support, a discharging hole is formed in the middle front side of the top of the embedding seat, a material collecting groove is formed in the center of the front side of the embedding seat, and a punching hole is formed in the middle of the embedding seat. A rectangular shell is arranged on the outer side of the front end of the embedding base in a front-back sliding fit mode, electric push rods are fixedly connected to the rear portions of the left side and the right side of the embedding base, push plates are fixedly connected to the output ends of the front sides of the electric push rods, and the front sides of the push plates are attached to the rectangular shell in an extrusion mode. The top face of the embedded base can be attached to and assist in supporting the stamping part of the rectangular shell, horizontal stability of the stamping periphery of the rectangular shell is kept, the sinking problem is avoided, meanwhile, the rectangular shell can be supported upwards, the compressive strength of the two sides of the rectangular shell is reduced, and the bending deformation problem is avoided.

The utility model belongs to mechanical or structure part static balance test technical field, concretely relates to airtightness detection mechanism for membrane electrode and airtight integrated machine using it, include: hydraulic drive position, detection position, pull rod guide pillar, pressure head traction plate, main hydraulic cylinder, upper pressure head, lower pressure plate seat, lower pressure plate, track assembly, pressure head traction plate swing joint in pull rod guide pillar, upper pressure head is connected in the downside of pressure head traction plate. The utility model through setting in pressure head traction plate, will main hydraulic cylinder and upper pressure head change into indirect connection, will lower pressure plate and multiple lower pressure plate seat contact fit, and track assembly sets up between two lower pressure plate seats, can maximize increase lower pressure plate and lower pressure plate seat contact area, reduce the pressure intensity of lower pressure plate bottom, make it can adapt 5Mpa's high pressure airtightness test, through the way of upper pressure head and lower pressure plate cover pressure to membrane electrode fixed, through blowing gas and detecting air flow fluctuation to judge whether there is gas leakage and then acquire airtightness.

The utility model relates to the technical field of shock absorption and noise reduction mechanisms, in particular to an excavator with a shock absorption and noise reduction mechanism, a cab shell is mounted on the rear side of the upper portion of an excavator body, a base is mounted in the middle of the upper portion of the excavator body, a shock absorption damping rod is hinged to the upper portion of the base, and a movable seat is hinged to the upper portion of the shock absorption damping rod. A rubber sleeve is mounted on the lower side of the periphery of the movable seat; the excavator has the beneficial effects that when an excavator body works, vibration can be transmitted to a cab, the vibration is transmitted to the damping rods through the base, the vibration amplitude and frequency are preliminarily weakened through stretching and retracting of the multiple sets of damping rods, and the rubber sleeves protect the internal damping rods against external influences; the movable seat and the connecting seat are connected through the air bag, the air bag can well absorb vibration, the spring rod limits the movement range of the connecting seat under the influence of vibration, and when the connecting seat collides with the movable seat under the influence of vibration, the rubber pad can effectively absorb vibration and reduce noise.

The present application relates to the technical field of laser rock breaking, and discloses a surface laser-induced cracking auxiliary rock breaking device, which comprises a laser operation trolley, a laser emitter is arranged on the laser operation trolley, a six-axis robot is arranged on the laser operation trolley, an execution end of the six-axis robot is provided with a surface laser cladding head, an optical fiber input line is arranged in the surface laser cladding head, a plurality of laser grooves are formed in the surface laser cladding head, a laser emission port is arranged in the laser groove, the laser emission port is connected with the optical fiber input line through a line, a collimating mirror and a focusing mirror are sequentially arranged in the laser groove along the axial direction of the surface laser cladding head, and the focusing mirror moves along the axial direction of the laser groove to change the focusing focal length. The rock is rapidly heated by laser to generate cracks, and the rock breaking efficiency of the post-period drilling and blasting method and mechanical method is improved; meanwhile, the focusing intensity of the laser is adjustable, so that the rock is broken by focusing appropriate laser intensity, and the expected rock breaking effect is achieved.

The utility model relates to the technical field of conveying belt structures, and discloses a conveying belt structure for a plate turnover machine, which comprises a conveying belt group and a bottom plate, the conveying belt group is assembled at the top of the bottom plate, corrugated grooves are uniformly formed in the outer part of the conveying belt, supports are uniformly distributed at the top of the bottom plate, and the corrugated grooves are formed in the bottom plate. Clamping mechanisms are welded to the two sides of the top of the support, each clamping mechanism comprises a clamping block, the clamping blocks are connected with the support, and vertical blocks are slidably connected into the clamping blocks. According to the conveying belt structure for the plate turnover machine, through cooperation of the clamping grooves, the sliding grooves, the clamping blocks, the vertical blocks, the springs, the connecting rods and the clamping arms which are additionally arranged, the supporting arms and the supports can be rapidly connected in a clamped mode, the clamping stability of the clamping mechanisms and the clamping grooves is improved through pressure borne by the tops of the supporting arms, and then the situation that the supports and the supporting arms are disconnected is avoided; under the condition that the bracket and the supporting arm are convenient to disassemble, the overall stability of the device is greatly improved.

The application discloses a jaw crusher for producing fire-resistant raw materials and relates to the technical field of crushers, which comprises a jaw crusher body, a fixed jaw plate and a movable jaw plate oppositely arranged in the jaw crusher body, a feeding hopper fixedly installed at the top of the jaw crusher body, a pre-crushing assembly arranged between the fixed jaw plate and the movable jaw plate, a driving rod capable of driving a reciprocating wire tube to synchronously rotate, a separation extrusion piece capable of pushing ore to both sides, small ore blocks falling from the gaps of large ore blocks, the fixed jaw plate and the movable jaw plate crushing the ore blocks, the driving rod sequentially meshing the second bevel gear, the third bevel gear and the fourth bevel gear to rotate the second bevel gear, the third bevel gear and the fourth bevel gear, the crushing roller rotating, the separation extrusion piece pushing and extruding, the large ore blocks being crushed in multiple directions and being pre-crushed into small ore blocks, the number of extrusion times being reduced, the abrasion of the jaw plate being reduced, the service life of the jaw plate being prolonged, and the crushing efficiency being improved.

This invention describes a modified silicate-polyurethane two-component grouting reinforcement material, comprising component A and component B, which are mixed in a 1:1 volume ratio before use. Component A, by mass percentage, consists of the following components: water glass: 94%; glycerol: 1%; glyceryl ester compounds: 1%; silane coupling agent: 1%; water: 3%. Component B, by mass percentage, consists of the following components: polymethylene polyphenyl polyisocyanate PM-200: 65%; dibutyl phthalate (DBP): 35%. This invention utilizes the synergistic effect of glyceryl ester compounds and silane coupling agents. The glyceryl ester compounds reduce the interfacial tension between the aqueous and oil phases and promote the uniform dispersion of the silane coupling agent. The silane coupling agent forms a chemical bridge between the inorganic and organic phases, enabling the originally incompatible aqueous and oily agents to form a homogeneous and compatible system. The resulting solidified body has a compressive strength of 24.6 MPa and a bond strength of 3.8 MPa, making it suitable for seepage prevention and sealing in underground engineering and for surrounding rock reinforcement.

The application belongs to the field of road engineering and discloses a composite high-performance cement-based grouting material for local disease repair excited by carbamate, which is characterized in that the adding amount of each component is as follows in terms of weight fraction: cement 45-50 parts; water 20-25 parts; composite polyurethane 2.0-2.5 parts; nano-silica ash 0.9-1.0 parts; fine sand 2.3-2.5 parts; water reducing agent 0.2-0.25 parts; and defoaming agent 0.2-0.25 parts. The application also discloses a preparation method. The application has the following main beneficial effects: the hydration reaction and hydration speed are improved, and the formation of early strength is promoted; the strength and interfacial bonding strength after hardening, the toughness and stability of the grouting material are improved, the bubble content in the grouting material is reduced, the brittle fracture of the road surface is effectively reduced, the cement mortar breaking strength is increased, the mixing is carried out at normal temperature, the required energy consumption is low, no waste gas is discharged, the strength after hardening is high, and the adaptability is good.

This invention provides a mixed aggregate mine backfill material of ultra-fine iron tailings sand and steel slag sand and its preparation method, belonging to the field of building materials. The mixed aggregate mine backfill material of ultra-fine iron tailings sand and steel slag sand provided by this invention comprises the following components in parts by weight: 6-13 parts iron tailings powder, 9-20 parts slag powder, 0.5-1 part desulfurization ash, 20-38 parts ultra-fine iron tailings sand, 10-28 parts steel slag sand, 0.6-1.4 parts activator, and 25-41 parts water. The mixed aggregate mine backfill material of ultra-fine iron tailings sand and steel slag sand provided by this invention has a 120-day shrinkage rate as low as 2.12% and a 28-day compressive strength as high as 7.68 MPa, exhibiting low shrinkage and high compressive strength.

The utility model discloses a dry quenching boiler pipeline isolation device, including first sheath, connecting plate, second sheath and third sheath, the first sheath right side low position is equipped with second sheath, the first sheath left side low position is equipped with third sheath, the first sheath, second sheath and third sheath structure are same, and first sheath, second sheath and third sheath top all weld and have connecting shell, the both ends of connecting shell all are open structure, and the both sides bottom of first sheath, second sheath and third sheath all weld and have connecting sleeve. The utility model through being equipped with a plurality of sheaths, and the bolt installation and dismounting between sheath and connecting plate can be selectively installed and used according to the demand, can isolate the pipeline, avoids a large number of circulating air volume and washes the pipe wall to make the shaking, the clearance smaller elbow place rubs each other, makes the pipe wall thin and the pressure strength reduction to the security of pipeline installation is increased.

The present application relates to a kind of screening evaluation method of coal bottom ash aggregate and application in the preparation of foam concrete, belong to building material and solid waste resource utilization technical field.Method includes: detecting the alkali content and loss on ignition of coal bottom ash aggregate, screening aggregate with alkali below threshold and loss on ignition below threshold;d 60 Value is detected, calculates uneven coefficient and curvature coefficient, evaluates its particle size distribution index;Determine its saturated water absorption, evaluate its physical property index;Determine its content of pozzolanic activity substance, evaluate its chemical activity index;According to three indexes, judge its application range.The present application sets up veto screening checkpoint, eliminates fatal risk (AAR problem and bubble breaking) from the source, then two physical function indexes and chemical index are coupled and evaluated, predict its performance in fresh stage and hardening stage, solve the problem of immediate process stability.Only need to detect 5 core indexes to complete evaluation, greatly shorten the evaluation period.