Double-injection double-seal pressure-display memory type single hydraulic prop

The invention discloses a floating oil passing pipe supporting structure for an integrated type hydraulic servo mechanism. The floating oil passing pipe supporting structure comprises an oil passing pipe (5), a supporting seat (10), a spring seat (18), a spring guiding sleeve (16) and a spring (19). One end of the oil passing pipe (5) is a ball head, and the supporting seat (10) is provided with a ball socket structure. The supporting seat (10) is connected with the oil passing pipe (5) through a spherical hinge so that the oil passing pipe can have certain rotating flexibility. The oil passing pipe (5) is axially supported through the spring (19). The top end of the ball head of the oil passing pipe (5) is in contact with a semispherical protruding point at one end of the spring guiding sleeve (16). The spring guiding sleeve (16) slides in a blind hole in the spring seat (18). The spring (19) is located in a blind hole of the spring guiding sleeve (16). The spring guiding sleeve (16) exerts axial force on the oil passing pipe (15) so that the ball head and the ball socket can be tightly pressed and sealed. The spring seat (18), the spring guiding sleeve (16) and the supporting seat (10) are coaxial. According to the floating oil passing pipe supporting structure, dual-redundancy sealing is adopted, and sealing is reliable.

Floating oil passing pipe supporting structure for integrated type hydraulic servo mechanism

The invention discloses a non-joint single hydraulic prop for blasting mining, and aims at solving the problems such as short travel, high minimum height, easy breaking and a plurality of processing processes of the existing device. The non-joint single hydraulic prop for blasting mining is characterized in that a movable prop body is a complete hollow barrel shaped body; the bottom end is in soft connection with a hollow piston body; a sealing block is mounted in the top end of the movable prop body, and a top cover is mounted at the outer part of the top end; the piston body is mounted in the base; a D-shaped sealing ring I and a guide ring are mounted between the piston body and an oil cylinder; the lower part of the oil cylinder is completely sealed through the base; the base is connected with the oil cylinder through a connecting steel wire I; a three-purpose valve seat is firmly welded on the outer wall of the movable prop body on the lower surface of the top cover. The non-joint single hydraulic prop for blasting mining is large in travel and small in minimum height; the movable prop is of a complete movable prop structure, so that the possibility of a joint, a prop head, a weld joint and breaking can be avoided; the load-deflection resistance is high; the base is in a form of a coated base, so that the bottom part of the oil cylinder is greatly protected; the prop can be quickly returned, and thus the safety is improved; the processing process is simple, and few materials are used; the piston body is of a dirt storage form and can be used for storing coal dust and other impurities entering the movable prop.

Non-joint single hydraulic prop for blasting mining

The invention belongs to the technical field of hydraulic equipment, and relates to a floating cylinder body structure. The connecting manner that an outer sleeve is fixed and an inner container floats is adopted in the structure; the deviation from the cylindrical form between a piston and a cylinder body can be eliminated through the structure; the service life of sealing rings and the service life of a cylinder barrel are prolonged; the problem of leakage caused by eccentric wear of sealing rings in a traditional cylinder body structure is solved; the bearing capacity is further enhanced; and according to the key, the inner container of the structure is of a replaceable structure and can be replaced with inner containers made of different materials so as to meet the requirements for different chemical properties of dirt water, mounting and later maintaining are simple, the manufacturing cost and the maintaining cost are reduced, and the work efficiency is greatly improved.

Floating cylinder body structure

Operating principle of water three-way valve with high flow for individual hydraulic prop in coal was presented in this paper, its strict and precise mathematical model was established, its flow field was simulated numerically by software Fluent, and its dynamic characteristics were analyzed during the work process such as raising leg, loading and overflow, the influence of the related parameters on high-flow water three-way valve was determined. The results as follows: during the raising leg stage and early raising leg stage, when the damping ratio increases, the overshoot of system decreases and the setting time reduces, and the dynamic response performance has a significant improvement. During the loading stage and the overflow stage, the pressure in plunger chamber of single hydraulic prop, the output flow and the displacement of the high-flow water three-way valve decrease with the decreasing of the external load. The spring stiffness of the safety valve directs the flow and the spool’s displacement of the safety valve, and it can be used to control the high-flow three-way valve’s sensitivity.

Dynamic characteristics of the high-flow water three-way valve

The invention discloses a single hydraulic prop comprising a top cover (20), a movable prop (10), a cylinder barrel (9), a base (2), a handle (11), a three-function valve seat (28) and a return spring, wherein the lower end of a cylinder sleeve is connected with a steel wire (5) through the base, a sealing ring (4) is sheathed with the base, the upper end of the cylinder sleeve is fixedly connected with a guiding sealing seat (14) which is internally provided with a sealing ring (15), an anti-extrusion ring (16), a dust-proof ring (18) and two groups of guiding rings (17); the middle-upper part in the cylinder barrel is fixed with a guiding sleeve (12) which is internally provided with two groups of guiding rings (13); the movable prop is sheathed in the cylinder barrel, the lower end of the movable prop is fixedly connected with a limiting ring (3) and the upper end thereof is fixedly connected with an upper end connecting sleeve (19); one end of the return spring is connected with asemicircular support (24) in the connecting sleeve at the upper end of the movable prop, and the other end thereof is connected with the base by a spring pressure plate (6) and a rubber pad (1) whichare fixed on the base; and the top cover is sheathed with the connecting sleeve at the upper end of the movable prop by being connected with a steel wire (23) and a sealing ring (22).

Single hydraulic prop

The utility model discloses a lubricating device for an outside pour type single hydraulic prop. The outside pour type single hydraulic prop is composed of a top cover, a moveable column, a handle valve with a three-use valve, an oil cylinder and a pedestal. The main body part of the handle valve is a pipe sleeve; and inner holes of the pipe sleeve are stair holes which are respectively cooperated with the outer revolving surfaces of the moveable column and the oil cylinder. Hole walls on which the inner wall of the pipe sleeve (1) is cooperated with the outer revolving surface of the moveable column are provided with annular grooves (4) in which lubricating grease is stored. During the movement, a good lubrication condition is formed by evenly smearing the grease on the outer revolving surface of the moveable column so as to avoid the damage of a sealing element by pulling.

External filling hydraulic prop lubrication apparatus

The invention discloses a floating type guiding sleeve of a single hydraulic prop, which is characterized in that a tubular guiding sleeve body (1) is designed; an inner hole of the guiding sleeve body is radially provided with two guiding grooves which are respectively provided with a guiding ring (2) and a guiding ring (4) internally; and the excircle surface of one of the two guiding rings is sheathed with a rubber ring (3). In the invention, as the other parts of the guiding sleeve are not contacted with the cylinder barrel, the guiding sleeve is not deformed when the interior of a cylinder barrel has no liquid pressure; when the prop under liquid pressure leads the movable prop to expand, the part of the guiding sleeve, not contacted with the cylinder barrel, can generate deformation,thus being capable of matching with the guiding ring in a guiding sealing seat better and leading axial stressing of the prop to realize balance and safe guiding on the axis line as much as possible;and when eccentric loading occurs, the guiding sleeve can generate proper deflection with the movable prop, thus relieving the influence of the eccentric loading on the sealing part and the guiding sleeve or the guiding ring to a certain extent and completely achieving the purpose of the invention.

Floating type guiding sleeve of single hydraulic prop

The utility model discloses an inside sealing top cover for an outside pour type single hydraulic prop. The outside pour type single hydraulic prop is composed of a top cover, a moveable column, a handle valve with a three-use valve, an oil cylinder and a pedestal. The top cover is composed of a square board and a section of column. Each of the four corners of the top surface of the square board is provided with a protruding claw. An outer column of the column (5) of the top cover is firmly cooperated, sealed and fixed with a section of inner hole wall at the upper part of the moveable column (11). The utility model has the advantages of simple structure, relatively lower production cost and convenient repair.

External filling hydraulic prop inner seal top cover

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Single hydraulic prop

External filling hydraulic prop lubrication apparatus

Floating type guiding sleeve of single hydraulic prop

External filling hydraulic prop inner seal top cover