Test bench for hydraulic support with free variable angle of top and bottom plates under external load

Abstract

The invention discloses a hydraulic support test bench with free variable angle of top and bottom plates under external loading, which solves the problem that it is inconvenient to detect hydraulic supports with existing devices. It is characterized in that jacks for adjusting the angle of the pressing plate are fixedly connected to the four corners of the top beam respectively, and jacks for adjusting the angle of the bottom plate are fixedly connected to the four corners of the base respectively; a variable-angle pressing plate and a variable-angle bottom plate are arranged between the top beam and the base; the four corners of the variable-angle pressing plate are respectively hinged to the jacks for adjusting the angle of the pressing plate through spherical hinge devices, and the four corners of the variable-angle bottom plate are respectively hinged to the jacks for adjusting the angle of the bottom plate through spherical hinge devices; the four corners of the variable-angle pressing plate and the variable-angle bottom plate are respectively connected to each column through two mutually perpendicular arc-shaped guide plates. The invention can simulate the working face in the coal mine underground, realize the three-dimensional stepless change of the angle of the top and bottom plates under the state of carrying load (external loading), and realize the evaluation and improvement design of the structure and support capacity of the hydraulic support by changing the magnitude, angle (direction), point of application of force, impact mode, etc.

Description

Technical Field

[0001] The present invention relates to a test device for detecting a hydraulic support, and more precisely, to a test device for a hydraulic support with externally applied load and free variable angle of the roof and floor. Background Art

[0002] Due to the uncertainty of the natural occurrence of coal seams, the changes in the roof and floor of the fully mechanized coal mining face occur, either in a pitching or dipping state, or both, and are rarely stable. Moreover, the pressure on the working face roof may also change at any time. The hydraulic supports used for supporting the working face in coal mines must also adapt to such changes. Therefore, in order to test whether the hydraulic support has such supporting performance, it is necessary to imitate certain working conditions of the working face and design a test bench for detecting the hydraulic support. And how to simply and reasonably design the structure of such a test bench is a topic that relevant personnel must face. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a test bench for a hydraulic support with externally applied load and free variable angle of the roof and floor, which can simulate the changes in various angles of the roof and floor, magnitudes, directions, acting points, and impact forms of pressures, and realize the evaluation and improved design of the structure and supporting capacity of the hydraulic support.

[0004] The present invention includes a top beam, a base, and columns. The top beam and the base are combined with four columns to form a frame structure. Its characteristics are as follows: at each of the four corners of the top beam, a pressing plate angle-adjusting loading jack is fixedly connected; at each of the four corners of the base, a bottom plate angle-adjusting loading jack is fixedly connected; between the top beam and the base, a variable-angle pressing plate and a variable-angle bottom plate are provided; at the four corners of the variable-angle pressing plate, they are respectively hinged to the pressing plate angle-adjusting loading jacks through spherical hinge devices; at the four corners of the variable-angle bottom plate, they are respectively hinged to the bottom plate angle-adjusting loading jacks through spherical hinge devices; at the four corners of the variable-angle pressing plate and the variable-angle bottom plate, they are respectively connected to each column through two mutually perpendicular arc-shaped guide plates, and the outer arc surfaces of the two mutually perpendicular arc-shaped guide plates are in contact with the columns.

[0005] Further, two mechanical limit plates are respectively arranged on both sides of the top beam, and a mechanical limit plugging and unplugging pin device is welded on the upper surface of the variable-angle pressing plate. The cooperation between the mechanical limit plugging and unplugging pin device and the mechanical limit plates limits the lifting height of the variable-angle pressing plate.

[0006] Further, a side loading device for the support top beam is connected under the variable-angle pressing plate, and a side loading device for the base, a pushing offset experiment seat, and a side loading device for pushing are arranged on the upper surface of the variable-angle bottom plate.

[0007] As can be seen from the above technical solutions, the present invention has the following beneficial effects: It can simulate the working face in a coal mine, realize the three-dimensional stepless change of the angles of the roof and floor (i.e., the variable-angle pressure plate and the variable-angle floor) under the load-bearing (externally loaded) state, and apply forces to the hydraulic support in a "kneading dough" manner by changing the magnitude, angle (direction), point of application, impact mode, etc. of the force. Combining the lateral forces on the roof beam and the base, and simulating the action of the downward sliding force of the matching scraper conveyor, it comprehensively detects the support performance of the hydraulic support, the stress distribution state under different working conditions (in order to make a continuous stress curve), the structural tolerance, etc., and provides a reference for the design and structural transformation of the hydraulic support; it has the characteristics that both the pressure plate and the floor can be externally loaded, the height can be adjusted steplessly, the angle can be continuously changed in a three-dimensional spherical-like manner, and the four corners are guided by a spherical-like surface, which is unique in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is the front view of the present invention.

[0009] Figure 2 is the left view of the present invention.

[0010] In the figure, 1. roof beam, 2. base, 3. column, 4. variable-angle pressure plate, 5. variable-angle floor, 6. pressure plate angle-adjusting loading jack, 7. floor angle-adjusting loading jack, 8. spherical hinge device, 9. two mutually perpendicular arc-shaped guide plates, 10. mechanical limit plug-and-pull pin device, 11. mechanical limit plate, 12. side loading device for the support roof beam, 13. side loading device for the support base, 14. push-loading eccentric test seat, 15. side loading device for the push. DETAILED DESCRIPTION OF THE INVENTION

[0011] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0012] As Figure 1 shown, the present invention includes a roof beam 1, a base 2, columns 3, a variable-angle pressure plate 4, a variable-angle floor 5, a pressure plate angle-adjusting loading jack 6, a floor angle-adjusting loading jack 7, a spherical hinge device 8, two mutually perpendicular arc-shaped guide plates 9, a mechanical limit plug-and-pull pin device 10, a mechanical limit plate 11, etc.

[0013] The described roof beam 1 and base 2 cooperate with four columns 3 to form a frame structure and bear the test load.

[0014] One pressure plate angle-adjusting loading jack 6 is fixedly connected to each of the four corners of the top beam 1, and one bottom plate angle-adjusting loading jack 7 is fixedly connected to each of the four corners of the base 2.

[0015] A variable-angle pressure plate 4 and a variable-angle bottom plate 5 are arranged between the top beam 1 and the base 2.

[0016] The four corners of the variable-angle pressure plate 4 are respectively hinged to the pressure plate angle-adjusting loading jack 6 through spherical hinge devices 8. The four corners of the variable-angle bottom plate 5 are respectively hinged to the bottom plate angle-adjusting loading jack 7 through spherical hinge devices 8.

[0017] The spherical hinge device 8 enables the variable-angle pressure plate 4 and the variable-angle bottom plate 5 to rotate at any angle. The pressure plate angle-adjusting loading jack 6 and the bottom plate angle-adjusting loading jack 7 enable the variable-angle pressure plate 4 and the variable-angle bottom plate 5 to continuously change their heights and angles.

[0018] The four corners of the variable-angle pressure plate 4 and the variable-angle bottom plate 5 are respectively connected to each column 3 through two mutually perpendicular arc-shaped guide plates 9. The outer arc surfaces of the two mutually perpendicular arc-shaped guide plates 9 contact the column 3. The two mutually perpendicular arc-shaped guide plates 9 enable the variable-angle pressure plate 4 and the variable-angle bottom plate 5 to be guided by the four columns 3 and keep positioning without shaking during the lifting or angle-changing process.

[0019] Two mechanical limit plates 11 are arranged on each side edge of the top beam 1. A mechanical limit plug-in and extraction pin device 10 is welded on the variable-angle pressure plate 4. The cooperation between the mechanical limit plug-in and extraction pin device 10 and the mechanical limit plate 11 limits the lifting height of the variable-angle pressure plate 4 to meet the test requirements for rigid fixation of the variable-angle pressure plate at different heights.

[0020] Working principle:

[0021] Under the control of the pressure plate angle-adjusting loading jack 6 and the bottom plate angle-adjusting loading jack 7, the variable-angle pressure plate 4 and the variable-angle bottom plate 5 can respectively change different heights and angles according to the test needs and are positioned guided by the four columns 3.

[0022] When external loading including different types of external loading is required, it is applied with the pressure plate angle-adjusting loading jack 6 and the bottom plate angle-adjusting loading jack 7 as the power. In this way, not only can the changes in the dip angle and pitching angle of the top and bottom plates of the coal mining face be simulated, but also the abutment pressure (external loading) of the coal mining roof can be simulated, and even the active floor heave or floor subsidence and other acting forces and their changes of the floor can be included.

[0023] Such as Figure 2As shown in the figure, a bracket top beam side loading device 12 is connected below the variable-angle pressing plate 4, which can simulate the working condition of the side force on the top beam of the hydraulic support (the force from the adjacent support in a large dip working face); a support base side loading device 13, a pushing eccentric load test seat 14, and a pushing side loading device 15 are arranged above the variable-angle bottom plate 5. The support base side loading device 13 can also simulate the force generated by the adjacent support base during support adjustment. The pushing eccentric load test seat 14 can conduct routine tests on the pushing part of the hydraulic support, and the pushing side loading device 15 can simulate the working condition of the middle trough of the scraper conveyor connected to the pushing part sliding down.

Claims

1. A test bench for a hydraulic support with a freely variable angle of the top and bottom plates under external loading, comprising a top beam, a base, and columns. The top beam and the base are combined with four columns to form a frame structure, and it is characterized in that: Four corner loading jacks (6) for adjusting the angle of the pressing plate are fixedly connected to each of the four corners of the top beam (1), and four corner loading jacks (7) for adjusting the angle of the bottom plate are fixedly connected to each of the four corners of the base (2); a variable-angle pressing plate (4) and a variable-angle bottom plate (5) are arranged between the top beam (1) and the base (2); the four corners of the variable-angle pressing plate (4) are respectively hinged to the pressing plate angle-adjusting loading jack (6) through a spherical hinge device (8), and the four corners of the variable-angle bottom plate (5) are respectively hinged to the bottom plate angle-adjusting loading jack (7) through a spherical hinge device (8); the four corners of the variable-angle pressing plate (4) and the variable-angle bottom plate (5) are respectively connected to each column (3) through two mutually perpendicular arc-shaped guide plates (9), and the outer arc surfaces of the two mutually perpendicular arc-shaped guide plates (9) contact the column (3).

2. The test bench for the hydraulic support with freely variable angles of the top and bottom plates as claimed in claim 1, characterized in that: Two mechanical limit plates (11) are arranged on each of the two side edges of the top beam (1), and a mechanical limit plugging and unplugging pin device (19) is welded on the upper surface of the variable-angle pressing plate (4). The cooperation between the mechanical limit plugging and unplugging pin device (10) and the mechanical limit plate (11) limits the lifting height of the variable-angle pressing plate (4).

3. The test bench for a hydraulic support with a freely variable angle of the top and bottom plates under external loading as described in claim 1, characterized in that: A side loading device (12) for the top beam of the support is connected below the variable-angle pressing plate (4), and a side loading device (13) for the base of the support, a push-over eccentric load test seat (14), and a side loading device (15) for pushing are arranged on the upper surface of the variable-angle bottom plate (5).

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