39results about How to "Work resistance" patented technology

The invention relates to a top coal caving hydraulic bracket with large mining height. The hydraulic bracket comprises a base, upright posts, a top beam, a front beam, a shield beam, a tail beam and an insertion plate; the top beam is supported on the base through four upright posts; the front beam and the shield beam are hinged with the front end and the rear end of the top beam respectively; the shield beam is also connected with a connecting rod; the front part of the front beam is provided with a telescopic beam which is connected with the front beam through a telescopic beam jack; the front end of the telescopic beam is hinged with the rear part of a protective plate; one end of a protective plate jack is connected with the telescopic beam; the other end pf the protective plate jack is connected with the tail part of the protective plate; the front end of the tail beam is hinged with the shield beam; the other end of the tail beam is connected with the shield beam through a tail beam jack; and the insertion plate is positioned in the inside of the tail beam. The hydraulic bracket has the advantages that the hydraulic bracket has large mining height and high working resistance, can realize top coal caving and can also realize overall height mining once when the thickness of the coal is 4.5 meters.

The invention discloses a continuous resistance-increasing deforming anchor rod, which is characterized by comprising a friction casing, a collapsible member and a fixing pull rod, wherein the inner diameter of the friction casing gradually becomes smaller from one end of the casing to the other end of the casing; the collapsible member is a tubular structure, and is nested in the friction casing, the outer diameter of the collapsible member gradually becomes smaller from one end to the other end of the member, and the outer wall of the collapsible member is kept contact with the inner wall of the friction casing; and one end of the fixing pull rod is connected with the collapsible member, and the fixing pull rod is led out from the small inner-diameter orifice end of the friction casing. When surrounding rock is largely deformed, the invention can be extended under tension without damage, also can continuously increase working resistance, and also can constantly absorb the energy of surrounding rock deformation during the process. In addition, the invention has the characteristics of simple structure, easy manufacturing, stable performance and the like.

A fastening structure of a heat conducting pipe and a plurality of fins is provided in a cooler containing a plurality of fins. Each of the surfaces of the fins includes at least a through hole and a through slot connecting to the through hole. The heat conducting pipe penetrates through the through holes of the fins. The drifts located at the end portion of the mold pressing piece are allowed to pass through the through slots to stamp the connection positions on surface of the heat conducting pipe for shaping the indentation portions. The indentation portions compress the heat conducting pipe to be combined tightly with the through holes so that the fins and the heat conducting pipe are combined tightly for strengthening the combination of the fins and the heat conducting pipe effectively, and preventing the heat conducting pipe from being damaged so as to raise the quality and heat conductivity of the products.

A slide bearing for internal combustion engines, comprising a slide layer including a lubricant outer layer in which a solid lubricant is contained, and wherein the lubricant outer layer contains an element which is contained in the solid lubricant, at a maximum concentration of not less than 5 mass % in the lubricant outer layer, and at least a solid lubricant gathered particle is formed on a surface of the lubricant outer layer, the solid lubricant gathered particle being a particle of the solid lubricant formed by gathering a plurality of primary particles, the solid lubricant gathered particle having a long side of not less than 20 μm but less than 100 μm in terms of surface visual field of the lubricant outer layer.

A cold work steel alloy for the manufacture of parts, comprising the elements C, Si, Mn, Cr, W, Mo, V, Nb, Co, S, N, Ni and accompanying elements in the concentration ranges recited in claim 1 and having an oxygen content of less than 100 ppm and a content of nonmetallic inclusions corresponding to a K0 value of a maximum of 3 when tested according to DIN 50 602, as well as a method of making a part of said steel alloy by powder metallurgy.

A whale-safe goundline rope for attachment to undersea traps and seagoing buoys. This rope is made of melt-processable polymers having filler particulate distributed uniformly throughout the polymer, prior to it being extruded into a fiber or yarn. The resultant fiber or yarn includes a plurality of voids or cavities. The manufacturing process generates a hollow rope, with that being a rope made from hollow fibers or yarn or with a hollow twisted core. The rope has a negative buoyancy.

The invention provides an anchor rod capable of adapting to surrounding rock deformation. The anchor rod comprises a rod body and a tray. The rod body comprises an extending section connected with theanchor tail. An extending device capable of moving relative to the rod body is mounted on the extending section and the anchor tail in a sleeving mode. The extending device comprises a sleeve and a spring. The sleeve comprises a movable end capable of being used for moving relative to the rod body. The spring is limited between the anchor tail and the movable end of the sleeve. The tray is detachably mounted on the sleeve. The tray is tightly pressed on the rock wall where the anchor rod is inserted when anchoring of the anchor rod is completed. The anchor rod has the beneficial effects thatthrough arrangement of the extending device, the effects that when surrounding rock is subjected to certain deformation, the length of the anchor rod is extended, so that deformation in the surrounding rock can be released, after the anchor rod extends, the working resistance of the anchor rod can be increased, and stability of the surrounding rock is maintained again are achieved; and through matching arrangement of the movable end of the sleeve and the spring of the extending section, the effect that during surrounding rock deformation, the extending device is subjected to relative displacement along with the rod body and thus adapts to surrounding rock deformation is achieved.

The invention relates to the technical field of coal mining, in particular to a constant-resistance contractible flexible support device and a roof cutting gob-side entry retaining blocking gangue support system. The constant-resistance contractible flexible support device comprises a cylinder body, a rod body and a supporting part; the cylinder body comprises a tray, a straight cylinder part anda conical cylinder which are sequentially connected; a guiding rod is formed in the straight cylinder part, one end of the guiding rod is fixed to the tray, and the other end of the guiding rod extends into the conical cylinder; the inner diameter and the outer diameter of the conical cylinder are gradually increased from the end connected with the straight cylinder part to the other end; the rodbody comprises a cone head and a straight rod, and a guiding hole is formed in the rod body; and the cone head is connected into the conical cylinder in matched and sleeved modes, and the guiding rodis inserted into the guiding hole in a matched mode. The device has certain receding characteristics in the vertical direction, vertical pressing, bending and damage are avoided, the large working resistance can be maintained to support a top plate, and the flexible support device and the roof cutting gob-side entry retaining blocking gangue support system are especially suitable for a roof cutting gob-side entry retaining project prone to generating surrounding rock large deformation, and can lay the foundation for successful implementation of roof cutting gob-side entry retaining of deep orthick coal seams.

The invention provides a vertical column pressure self-adaptive adjusting and controlling system. The vertical column pressure self-adaptive adjusting and controlling system comprises a pilot valve, ahydraulic control one-way valve, a sequence valve, a safety valve, a hydraulically-operated reversing valve, a vertical column, a liquid supply pipeline P and a liquid return pipeline O. During initial supporting of a vertical column, a lower cavity of the vertical column and an upper cavity of the vertical column communicate with the liquid supply pipeline P, and the supporting resistance is lowduring initial working of the vertical column; when the vertical column normally works, the upper cavity of the vertical column communicates with the liquid supply pipeline P, and the pressure of thelower cavity of the vertical column is increased along with increase of externally-applied loads due to the effect of the hydraulic control one-way valve; and when the pressure of the lower cavity ofthe vertical column reaches a set value, the sequence valve acts, the hydraulically-operated reversing valve carries out reversing, the upper cavity of the vertical column communicates with a liquidreturn port O, the supporting resistance of the vertical column is increased along with increase of the externally-applied loads, when the pressure of the lower cavity of the vertical column reaches the set pressure of the safety valve, the safety valve is switched on, the supporting resistance of the vertical column reaches rated working resistance, the purposes that the initial supporting forceof the vertical column is low, the working resistance is high, and the change amplitude of the supporting resistance is large are achieved, and meanwhile the purpose of automatically adjusting the supporting resistance according to the load change is achieved.

The invention discloses an advanced support device and method for a roadway and application of the advanced support device and method. The advanced support device comprises a stacking type advanced support group (1) mounted at the front end of the roadway close to a coal face, and a step taking type advanced support group (2) mounted at the position, away from the coal face, of the front end of the roadway far. Through the stacking type advanced support group (1), split type moving at the front end of the extending roadway of the coal face is realized; and through the step taking type advancedsupport group (2), integral moving at the rear end of the roadway is realized, so that support for a broken roadway top plate and the roadway with high pressure at a coal mining triangle area is met.

The invention discloses a pressure yielding mechanism comprising a shell and a rod body, wherein one end of the rod body is protruded outwards to form a shearing head, two or more pressure yielding plates are fixed in the shell, through holes through which the rod body passes to clamp the shearing head are formed in the pressure yielding plates. An anchor rod produced by using the pressure yielding mechanism provided by the invention can be prolonged by stretching when surrounding rock of a roadway or a side slope deforms largely, an adjustable work resistance is provided along with the deformation and prolongation of the anchor rod, the work resistance can be increased and can also be decreased so as to be capable of changing flexibly, and can also be fully coordinated with the deformation state of the surrounding rock of the roadway or the side slope, and thus a good supporting and pressure yielding effect is provided.