SU1216358A1 - Individual hydraulic prop - Google Patents

Description

The invention relates to the field of underground coal mining, and it is to the individual hydraulic means of fixing the cleaning faces.

The aim of the invention is to improve the reliability of a hydraulic post by eliminating the possibility of vigorous wear and destruction of the external surface of the sliding element.

FIG. 1 shows the proposed hydraulic individual stand in the folded position, general view; in fig. 2 and 3 - elements of the rack with its full separation, options.

The hydraulic stand of the individual support includes a housing 1, inside which the sliding element 2 is located, the outer surface 3 to which is sealed along the sleeve A fixedly mounted in the upper part of the housing 1 and equipped with sealing elements 5, the sleeve 4 has a V-ring inner groove 6 with upper conical 7 and lower inclined 8 surfaces, lower end of sliding element 2 — annular groove 9 of trapezoid shape with upper upper surface 10 located perpendicular to the stand axis, and lower conical surface rhnostyu 11. Surface 11 is parallel to the upper conical surface 7 of the U-obraztyugo annular groove 6 or forms with it an acute angle directed toward the axis of the strut. In the annular groove 9, a stop ring t2 of the ring t2 is installed, in the initial position being in constant contact with the inner surface 13 of the housing 1. The upper end of the sliding element 2 is provided with a support head 14, to the lower plane of which a tension spring 15 is attached, connected by its the lower end with the bottom of the housing 1.

Since the retaining spring ring 12 interacts with the inner surface 13 of the housing 1 with minimal gaps at the points of their contact, it can be used as a supporting member of the rack that determines the size of the embedment base of the sliding element 2 in the housing 1 when it is extended. Such a constructive solution allows a fixed element 2 of constant diameter to be made along its entire length.

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When the rack expands, the sliding element .2 moves upwardly relative to the housing 1 and the sleeve 4 under the pressure of the fluid. The stopper spring ring 12 during this period serves as the second support member for it and determines the size of the base of the sealing it in the case equal to the distance from the upper edge of the sleeve 4 to the line of contact of the retaining spring ring 12c by the cylindrical surface 13 of the housing 1.

15 The work of the proposed rack when lowering the roof of the reservoir is similar to the work of the known racks, the difference is that the lateral loads acting on the rack perceived 20 laps with the upper edge of the sleeve 4 and

retaining spring ring 12.

In the case of a full extension of the rack, the retaining spring ring 12 after its movement to the y-shaped

25, the annular groove b starts to work as a compression spring, ensuring its sliding along the inclined surface 8 of this groove until it is clamped between the conical surfaces 7 and

30 11 whereupon any movement of the sliding element 2 is prevented when the hydraulic force is applied to it prior to expansion.

When unloading the rack and forcibly lowering the sliding element 2 by the force of the spring 15 stretching the same, the locking spring ring 12 engages with the flat surface 10 of the trapezoidal ditches ki 9, moves downward under the action of the radial component of its contact with the inclined surface 8 and returns to its original position.

35

Thus, by means of a crairopic spring ring 12 and two conical surfaces 7 and 11, it is possible to limit the movement of the sliding element 2 in the structures of struts with very small gaps between the cylindrical surfaces of the housing and the sliding part. Considering that the cylindrical surface 13 of the housing 1 is located inside the rack and is not compactable, the presence of constant contact and friction between it and the snap ring 12 does not reflect the performance of the rack.

3

In those cases when the rack is fully extended, it will be under load, the size of the embedment base of sliding element 2 in housing 1 may be insufficient to absorb lateral loads. To ensure normal operation of the rack. In such positions, the V-shaped annular groove can be made in the form of a lead-in chamfer 16 connected to each other from the upper end of the body 1 and the conical chamfer 17

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side of the lower end of the sleeve 4 (FG-.t. 3).

The process of operating the rack using such a V-groove is not different from that described. However, this increases the base of embedment of the sliding element 2 to the epus 1 and simplifies the design by using to create the said groove of the usual elements provided by the manufacturing technology of the housing 1 and the sleeve 4.

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Editor L. Gratilllo

(re.E

Compiled a. Ponomareva

Tehred M. Parotsay Proofreader E, Sirokhman

tpof.Z

Order 973/37

Circulation 470

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

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Claims (1)

HYDRAULIC INDIVIDUAL RACK, including- a housing, inside of which there is a sliding element with an outer ring groove in its lower part, a snap ring, a piston cavity sealing element installed in the sleeve, which is located in the upper part of the housing and has an inner ring a groove, the upper conical surface of which forms an acute angle with the top directed towards the groove with the lower conical surface of the outer annular groove, characterized in that, in order to increase its reliability spacing by eliminating the possibility of intensive wear and destruction of the outer surface of the retractable element, the latter is made of constant diameter, the annular outer groove is trapezoidal, the annular internal groove is V-shaped,. while the sealing element of the piston cavity is installed in the sleeve, and the snap ring in the outer ring groove with the possibility of interaction with the inner surface of the cylinder. SU .. „1216358 I