Method for controlling double bottom valve column

Abstract

The present invention discloses a method for controlling a double bottom valve column, comprising a large cylinder body of the column and a middle cylinder body of the column, wherein the bottom wall of the middle cylinder body of the column is provided with two bottom valves. The inner diameter of the large cylinder body of the column is φ600mm. The two bottom valves have the same structure and are installed in symmetrical positions. A small boss for opening the bottom valve is provided on the bottom wall of the large cylinder body of the column, and the control heads of the two bottom valves are respectively fixed on the small bosses. The bottom wall of the middle cylinder body of the column is provided with two symmetrical bottom valve holes, in which two bottom valves are respectively installed, and fastening screw plugs are installed in the bottom valve holes, and threaded holes are drilled and anti-loosening screws are installed. By increasing the number of bottom valves, the purpose of increasing the opening pressure of the bottom valve and increasing the flow rate of the bottom valve is achieved, and the requirements of the φ600mm column for the bottom valve performance can be met.

Description

Technical Field

[0001] The invention relates to a hydraulic support for coal mines, in particular to a double bottom valve column. Background Art

[0002] As mining difficulties in fully mechanized mining faces continue to increase, the hydraulic support system for underground support systems is undergoing continuous upgrades, and the columns—their primary working components—are also undergoing continuous improvement. Currently, the world's largest column diameter has reached 600mm. However, the foot valves for columns with such large diameters are not yet mature, and the performance parameters of existing foot valves do not meet the requirements of 600mm columns.

[0003] like Figure 1 As shown, the existing mature double telescopic column has a basic structure of designing and installing a bottom valve at the bottom of the middle cylinder. In this structure, the area of ​​the large cylinder bottom boss that controls the opening of the bottom valve is small, the fixing mechanism of the bottom valve is simple, and the various components are easy to process, install, and disassemble.

[0004] However, redesigning a hydraulic valve is relatively complex. While the principle of a bottom valve is relatively simple, parameters such as its opening pressure, flow rate, and opening stroke must be perfectly matched to theoretically reasonable calculations, and each component must be highly machinable and economical. Even after a product is finally manufactured, extensive testing is required to verify its performance. The entire process from design, manufacturing, to industrial testing takes a long time. Summary of the Invention

[0005] The purpose of the present invention is to provide a double bottom valve column.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] The double bottom valve column of the present invention comprises a column large cylinder body and a column middle cylinder body, and the bottom wall of the column middle cylinder body is provided with two bottom valves.

[0008] It can be seen from the technical solution provided by the present invention that the double bottom valve column provided in the embodiment of the present invention increases the number of bottom valves, thereby achieving the purpose of increasing the bottom valve opening pressure and increasing the bottom valve flow rate, and can meet the requirements of the φ600mm column for the bottom valve performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the single bottom valve column structure in the prior art.

[0010] Figure 2 This is a schematic diagram of the double bottom valve column structure provided by an embodiment of the present invention.

[0011] In the picture:

[0012] 1. Column large cylinder, 21. Circlip, 3. Fastening screw plug, 4. Bottom valve, 5. Column middle cylinder;

[0013] 22. Anti-loosening screws. DETAILED DESCRIPTION

[0014] The following is a further detailed description of the embodiments of the present invention. The contents not described in detail in the embodiments of the present invention belong to the prior art known to those skilled in the art.

[0015] The double bottom valve column of the present invention has the following preferred embodiments:

[0016] The utility model comprises a column large cylinder body and a column middle cylinder body. The bottom wall of the column middle cylinder body is provided with two bottom valves.

[0017] The inner diameter of the column large cylinder is φ600mm.

[0018] The two bottom valves have the same structure and are installed in symmetrical positions.

[0019] A small boss for opening the bottom valve is provided on the bottom wall of the large cylinder body of the column, and the control heads of the two bottom valves are respectively fixed on the small bosses.

[0020] The bottom wall of the cylinder in the column is provided with two symmetrical bottom valve holes, which are respectively installed with two bottom valves. Fastening screw plugs are installed in the bottom valve holes, and threaded holes are drilled to install anti-loosening screws.

[0021] The present invention increases the number of bottom valves, thereby achieving the purpose of increasing the opening pressure of the bottom valves and increasing the flow rate of the bottom valves, and can meet the performance requirements of the bottom valves of a φ600mm column. Specific embodiments

[0022] Adding a foot valve would be a significant challenge, both in terms of the structural design and manufacturing of the column, but it is not impossible. First, the foot valve is primarily used to control the movement of the secondary cylinder of the dual telescopic column. Therefore, when designing and installing double bottom valves, it is necessary to ensure that the two bottom valves operate in unison, that is, open and close at the same time. This requires that the two bottom valves be installed in the same position.

[0023] like Figure 2 As shown, the diameter of the small boss originally used to open the bottom valve has been enlarged, allowing it to operate two bottom valves. Two symmetrical bottom valve holes are machined into the bottom of the middle cylinder, each housing a bottom valve. Fastening plugs are designed to secure the bottom valves. To prevent loosening, threaded holes are drilled and screws are installed in each. This creates a dual bottom valve structure.

[0024] At present, the 600mm column of this structure is being trial-applied to the latest ZY26000 / 40 / 88D shielded hydraulic support of Beijing Coal Machinery Co., Ltd. The support has passed the pressure test for about 30,000 times and is operating normally.

[0025] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for controlling a double bottom valve column, wherein the double bottom valve column comprises a column large cylinder body and a column middle cylinder body, characterized in that: The bottom wall of the cylinder in the column is provided with two bottom valves; The inner diameter of the column large cylinder is φ600mm; The two bottom valves have the same structure and are installed in symmetrical positions; A small boss for opening the bottom valve is provided on the bottom wall of the large cylinder body of the column, and the control heads of the two bottom valves are respectively fixed on the small bosses; The bottom wall of the cylinder in the column is provided with two symmetrical bottom valve holes, two bottom valves are installed respectively, fastening screw plugs are installed in the bottom valve holes, and threaded holes are drilled to install anti-loosening screws; The method is: The two bottom valves open and close at the same time to control the movement of the cylinder in the column.

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