CN210370744U - Impact-resistant three-telescopic upright post for hydraulic support - Google Patents

Abstract

The utility model discloses a shock-resistant three-telescopic stand column for a hydraulic support, which comprises a first-stage cylinder body, a control valve seat and a column-descending liquid inlet joint which are arranged on the outer wall of the first-stage cylinder body, a second-stage cylinder body which is arranged in the first-stage cylinder body in a sealing and sliding manner through a first guide sleeve, a third-stage cylinder body which is arranged in the second-stage cylinder body in a sealing and sliding manner through a second guide sleeve, and a piston column which is arranged in the third-stage cylinder body in a; the lower end face of the piston column is provided with a first blind hole along the axial direction, a supporting rod is arranged in the first blind hole in a clearance mode, the upper end face of the supporting rod is provided with a second blind hole along the axial direction, and the lower portion of the second blind hole is provided with a flow guide channel communicated with the inner cavity of the first blind hole; the outer peripheral surface of the upper end of the supporting rod is provided with a ring platform, the outer peripheral surface of the ring platform is in sealed sliding fit with the inner peripheral surface of the first blind hole, the outer peripheral surface of the lower end of the supporting rod is in sealed sliding fit with a piston, and the piston is fixedly connected with a piston column. The utility model discloses satisfy under the big concertina ratio prerequisite of designing requirement for tertiary jar cavity of resorption pressure reduces more than 20%.

Description

Impact-resistant three-telescopic upright post for hydraulic support

Technical Field

The utility model relates to a hydraulic support is used to the face is synthesized in colliery, especially relates to three flexible stands that resist shock for hydraulic support.

Background

At present, hydraulic support stand columns used for fully mechanized mining surfaces of coal mines comprise single telescopic stand columns, single telescopic mechanical lengthened stand columns and double telescopic stand columns. The expansion ratio of the double telescopic columns is maximum, so that the requirements of most coal mines can be met; however, the thickness of the coal seam in a few areas changes frequently, and particularly when a fully-mechanized mining area has a fault to pass through, the lifting range and the falling range of the hydraulic support are required to be larger; for part of special coal seams, the double telescopic columns cannot meet the requirement that the ratio of the highest support height to the bottommost support height of the hydraulic support is large at the same time.

The technical scheme disclosed by the Chinese invention patent number ZL201310383905.7 and named as 'three-telescopic-column for hydraulic support' effectively solves the problem of large telescopic ratio, but also has the problem of large pressure intensity loaded in a three-stage cylinder. The cylinder diameter of the first, second and third stage cylinders in the three telescopic columns is gradually reduced, the external pressure borne by each stage of cylinder is the same, but the borne pressure is gradually increased, and the pressure borne by the three stage cylinders is too high because the pressure is inversely proportional to the bearing area; especially, when the hydraulic support frequently bears impact load, severe events such as cylinder explosion of the stand column, beating of the guide sleeve and the like are easily caused, and great threats are caused to equipment and personnel safety.

Disclosure of Invention

An object of the utility model is to provide a three flexible stands that resist shock for hydraulic support.

In order to achieve the above purpose, the utility model adopts the following technical proposal:

the utility model discloses a three flexible stands that resist shock for hydraulic support, including the one-level cylinder body, set up control valve seat and the drop post inlet joint on the outer wall of one-level cylinder body, through the sealed second grade cylinder body that slides and set up in the one-level cylinder body of first uide bushing, through the sealed third cylinder body that slides and set up of second uide bushing in the second grade cylinder body, through the sealed piston post that slides and set up of third uide bushing in the third grade cylinder body; the bottom wall of the second-stage cylinder body is provided with a first hydraulic control valve communicated with the lower cavities of the first-stage cylinder body and the second-stage cylinder body, and the bottom wall of the third-stage cylinder body is provided with a second hydraulic control valve communicated with the lower cavities of the second-stage cylinder body and the third-stage cylinder body; the liquid outlet of the control valve seat is communicated with the lower cavity of the primary cylinder body, the falling column liquid inlet joint is communicated with the upper cavity of the primary cylinder body, and a secondary flow passage communicated with the upper cavities of the primary and secondary cylinder bodies is longitudinally arranged in the side wall of the secondary cylinder body; a third-stage flow channel communicated with the upper cavities of the second-stage cylinder body and the third-stage cylinder body is formed in the side wall of the third-stage cylinder body; a first blind hole is formed in the lower end face of the piston column along the axial direction, a support rod is arranged in the first blind hole in a coaxial clearance mode, a second blind hole is formed in the upper end face of the support rod along the axial direction, and a flow guide channel communicated with the inner cavity of the first blind hole is formed in the lower portion of the second blind hole along the radial direction; the outer peripheral surface of the upper end of the supporting rod is provided with a ring platform, the ring platform and the supporting rod are of an integrated structure processed by forging and pressing, the outer peripheral surface of the ring platform is in sealed sliding fit with the inner peripheral surface of the first blind hole, the outer peripheral surface of the lower end of the supporting rod is in sealed sliding fit with a piston, and the piston is fixedly connected with the piston column.

The utility model discloses under the big concertina ratio prerequisite that satisfies the designing requirement for the inside bearing area of tertiary jar can increase, and tertiary jar cavity of resorption pressure reduces more than 20%. Therefore, when the three telescopic columns bear impact load, a part of impact pressure is guided to the fourth pressure bearing cavity, impact time is prolonged, and damage caused by the impact pressure is reduced.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a schematic sectional view taken along line a-a of fig. 1.

Detailed Description

The following describes embodiments of the present invention in detail with reference to the drawings, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are provided, but the scope of the present invention is not limited to the following embodiments.

As shown in fig. 1 and 2, the shock-resistant three-telescopic column for a hydraulic support comprises a first-stage cylinder body 1, a control valve seat 1.1 and a column lowering liquid inlet joint 1.2 which are arranged on the outer wall of the first-stage cylinder body 1, a second-stage cylinder body 2 which is arranged in the first-stage cylinder body 1 in a sealing and sliding manner through a first guide sleeve 1.3, a third-stage cylinder body 3 which is arranged in the second-stage cylinder body 2 in a sealing and sliding manner through a second guide sleeve 2.1, and a piston column 4 which is arranged in the third-stage cylinder body 3 in a sealing and sliding manner through a third guide sleeve; the bottom wall of the second-stage cylinder body 2 is provided with a first hydraulic control valve 2.2 communicated with the lower cavities of the first-stage cylinder body 1 and the second-stage cylinder body 2, and the bottom wall of the third-stage cylinder body 3 is provided with a second hydraulic control valve 3.2 communicated with the lower cavities of the second-stage cylinder body 2 and the third-stage cylinder body 3; a liquid outlet of the control valve seat 1.1 is communicated with a lower cavity of the primary cylinder body 1, a column descending liquid inlet joint 1.2 is communicated with an upper cavity of the primary cylinder body 1, and a secondary flow passage 2.3 communicated with the upper cavities of the primary and secondary cylinder bodies 1 and 2 is longitudinally arranged in the side wall of the secondary cylinder body 2; a third-stage flow channel 3.3 communicated with the upper cavities of the second-stage cylinder body 2 and the third-stage cylinder body 3 is formed in the side wall of the third-stage cylinder body 3; a first blind hole 4.1 is axially formed in the lower end face (left end face in the figure) of the piston column 4, a support rod 5 is coaxially arranged in the first blind hole 4.1 at a clearance, a second blind hole 5.1 is axially formed in the upper end face (right end face in the figure) of the support rod 5, and a flow guide channel 5.2 communicated with the inner cavity of the first blind hole 4.1 is radially formed in the lower part (left part in the figure) of the second blind hole 5.1; the outer peripheral surface of the upper end (right end surface in the figure) of the support rod 5 is provided with a ring platform 5.3, the ring platform 5.3 and the support rod 5 are of an integrated structure processed by forging and pressing, the outer peripheral surface of the ring platform 5.3 is in sealed sliding fit with the inner peripheral surface of the first blind hole 4.1, the outer peripheral surface of the lower end of the support rod 5 is in sealed sliding fit with a piston 6, and the piston 6 is fixedly connected with the piston column 4.

The utility model discloses the theory of operation is as follows briefly:

1. lifting the column: emulsion gets into the 1 intracavity in one-level cylinder body through control disk seat 1.1 on the 1 outer wall of one-level cylinder body, promote second grade cylinder body 2 to drive tertiary cylinder body 3 and piston post 4 and rise together, second grade cylinder body 2 rises to the highest position and stops, first liquid accuse valve 2.2 is opened, emulsion gets into the 2 intracavity in the lower of second grade cylinder body, it drives piston post 4 and rises together to promote tertiary cylinder body 3, tertiary cylinder body 3 rises to the highest position and stops, second liquid accuse valve 3.2 is opened, emulsion gets into the 3 intracavity in the lower of tertiary cylinder body, it rises to promote piston post 4, piston post 4 rises to the highest position and stops, the ascending process of whole stand ends.

It is emphasized that: the piston post 4 rises in-process bracing piece 5 is motionless, consequently gets into the emulsion of tertiary cylinder body 3 lower intracavity and passes through water conservancy diversion passageway 5.2 and get into second blind hole 5.1, and the emulsion reaches in the fourth pressure-bearing chamber 7 at first blind hole 4.1 top through second blind hole 5.1, promptly: the pressure of the lower cavity of the third-stage cylinder 3 is transmitted into the fourth pressure-bearing cavity 7 of the piston column 4, so that the pressure-bearing area of the lower cavity of the third-stage cylinder 3 is increased, and the pressure born by the lower cavity of the third-stage cylinder is reduced; meanwhile, when the three telescopic columns are subjected to impact load, emulsion in the fourth pressure bearing cavity 7 at the tops of the three-stage cylinder body 3 and the piston column 4 plays a role in buffering, the overall hydraulic elastic coefficient of the columns is effectively reduced, the impact action time is prolonged, and the impact resistance of the columns is remarkably enhanced.

2. Descending the column: the emulsion passes through the inlet joint 1.2 entering one-level cylinder body 1 epicoele on the 1 outer wall of one-level cylinder body, 1 cavity in one-level cylinder body returns the liquid, first liquid accuse valve 2.2 this moment, second liquid accuse valve 3.2 all is in the closed condition, the emulsion promotes second stage cylinder body 2 and drives tertiary cylinder body 3 and piston post 4 decline, first liquid accuse valve 2.2 is opened when second stage cylinder body 2 falls to the bottom position, the emulsion promotes tertiary cylinder body 3 and piston post 4 and descends together, when tertiary cylinder body 3 falls to the bottom position, second liquid accuse valve 3.2 is opened, the emulsion promotes piston post 4 and descends, whole stand falls the post process and finishes.

Meanwhile, the annular table 5.3 arranged on the outer peripheral surface of the upper end of the support rod 5 and the support rod 5 are formed by one-step forming and integral processing through high-temperature forging and pressing, so that the integral strength and the coaxiality of the support rod 5 are ensured.

Claims (1)

1. An impact-resistant three-telescopic upright column for a hydraulic support comprises a primary cylinder body, a control valve seat and a column descending liquid inlet joint which are arranged on the outer wall of the primary cylinder body, and a secondary cylinder body which is arranged in the primary cylinder body in a sealing and sliding mode through a first guide sleeve; the bottom wall of the second-stage cylinder body is provided with a first hydraulic control valve communicated with the lower cavities of the first-stage cylinder body and the second-stage cylinder body, and the bottom wall of the third-stage cylinder body is provided with a second hydraulic control valve communicated with the lower cavities of the second-stage cylinder body and the third-stage cylinder body; the liquid outlet of the control valve seat is communicated with the lower cavity of the primary cylinder body, the falling column liquid inlet joint is communicated with the upper cavity of the primary cylinder body, and a secondary flow passage communicated with the upper cavities of the primary and secondary cylinder bodies is longitudinally arranged in the side wall of the secondary cylinder body; a third-stage flow channel communicated with the upper cavities of the second-stage cylinder body and the third-stage cylinder body is formed in the side wall of the third-stage cylinder body; the method is characterized in that: a first blind hole is formed in the lower end face of the piston column along the axial direction, a support rod is arranged in the first blind hole in a coaxial clearance mode, a second blind hole is formed in the upper end face of the support rod along the axial direction, and a flow guide channel communicated with the inner cavity of the first blind hole is formed in the lower portion of the second blind hole along the radial direction; the outer peripheral surface of the upper end of the supporting rod is provided with a ring platform, the ring platform and the supporting rod are of an integrated structure processed by forging and pressing, the outer peripheral surface of the ring platform is in sealed sliding fit with the inner peripheral surface of the first blind hole, the outer peripheral surface of the lower end of the supporting rod is in sealed sliding fit with a piston, and the piston is fixedly connected with the piston column.

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