Rear restraint tool for horizontal loading test of hydraulic support and test device

Abstract

The utility model relates to the technical field of hydraulic support test equipment, in particular to a rear restraining tool and a test device for a horizontal loading test of a hydraulic support, and the rear restraining tool comprises a base plate, at least two limiting strips and a top block; a plurality of limiting grooves are formed in the test bed base at intervals in the length direction; the at least two limiting strips are arranged at intervals in the front-back direction and perpendicularly and fixedly connected to the lower plate face of the base plate, and the limiting strips extend in the left-right direction. The top block is fixed on the upper plate surface of the base plate; the test device comprises a test bed base and a rear constraint tool, and a plurality of limiting grooves are formed in the upper surface of the test bed base. During a horizontal loading test, the hydraulic support is pressed on the base plate, the self weight of the hydraulic support tightly presses the limiting strip and the limiting groove to form wedge-shaped matching, and meanwhile, the top block abuts against the rear end of the hydraulic support, so that the hydraulic support is supported on the rear restraining tool and backwards moves and limits the hydraulic support, and the stability of the hydraulic support and the tool in the horizontal loading test process is ensured.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, and in particular to a post-constraint fixture and testing device for horizontal loading tests of hydraulic supports. Background Technology

[0002] Hydraulic supports, as crucial support equipment in coal seam mining, are primarily used to support the working face. Before formal application, they must undergo rigorous type testing procedures. These procedures aim to comprehensively verify the support structure design, component selection, and operational reliability, and have become an internationally accepted technical regulatory measure. Hydraulic supports mainly consist of support columns, top beams, tail beams, shield beams, front beams, and bases.

[0003] Hydraulic supports, as key mining equipment, are subjected to both vertical roof pressure and horizontal loads from the coal face or goaf when operating underground. These horizontal loads are primarily generated by friction between the roof and the supports, as well as the interaction between the supports themselves. Horizontal loading tests, by simulating this horizontal force, can verify the structural strength and stability of the supports under complex multi-directional loads, ensuring their reliability in actual working conditions. The hydraulic support-surrounding rock environment is complex, with roof unevenness caused by factors such as fracturing, cave-ins, and coal cutting. This results in a non-ideal, tight planar contact between the hydraulic support's top beam and the roof. Directly simulating the contact state between the hydraulic support and the surrounding rock in the laboratory is difficult; therefore, padding blocks are typically placed between the support and the test bench to simulate actual working conditions.

[0004] The hydraulic support test bench structure mainly includes a test bench base fixed to the foundation by anchor bolts, a column fixedly connected to the base, a movable platform that can slide up and down the column, and a top beam fixedly connected to the top of the column.

[0005] When conducting horizontal loading tests on hydraulic supports, in order to prevent the hydraulic supports from shifting in the front-back and left-right directions, the hydraulic supports need to be fixed on the base of the hydraulic support test bench. The existing technology places a loading pad between the test bench and the hydraulic support and fixes the metal fixture to the test bench base with bolts. When the hydraulic support is horizontally loaded, it will generate an upward warping force on the fixture, which may cause the fixture to fall out of the fixed position, resulting in insufficient stability, test interruption and safety hazards.

[0006] Therefore, there is an urgent need to propose a constraint fixture for hydraulic supports after horizontal loading to solve the technical problem of insufficient stability of hydraulic supports using bolt-fixed fixtures during horizontal loading tests. Utility Model Content

[0007] (a) Technical problems to be solved

[0008] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a post-constraint fixture and testing device for horizontal loading tests of hydraulic supports, which solves the technical problem of insufficient stability of hydraulic supports using bolt fixing fixtures during horizontal loading tests.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0011] In a first aspect, this utility model provides a rear constraint fixture for a horizontal loading test of a hydraulic support, characterized in that it includes a base plate, at least two limiting strips, and a top block; the at least two limiting strips are spaced apart along the front-rear direction, the limiting strips are vertically fixedly connected to the lower surface of the base plate, the limiting strips extend along the left-right direction, and can be inserted into the limiting groove on the base of the hydraulic support test bench, so that the rear constraint fixture is positioned in the hydraulic support test bench; the top block is fixedly connected to the upper surface of the base plate, the upper surface of the base plate is used to support the hydraulic support, and the front end of the top block is used to abut against the rear end of the hydraulic support, so that the hydraulic support is supported on the rear constraint fixture and the rearward movement of the hydraulic support is limited.

[0012] Optionally, it also includes a vertical plate; the vertical plate is vertically fixed to the upper surface of the substrate and extends in the left-right direction; the front surface of the vertical plate and the rear surface of the top block are fixedly connected.

[0013] Optionally, it also includes at least two stiffening plates; the stiffening plates are vertically fixedly connected to the upper surface of the base plate, the front end of the stiffening plates is fixedly connected to the rear surface of the upright plate, and the stiffening plates and the upright plate are perpendicular.

[0014] Optionally, the substrate is made of high-strength steel, and the outer surface of the substrate is provided with a wear-resistant coating.

[0015] Optionally, the limiting strip is welded and fixed to the substrate.

[0016] Optionally, the substrate is a rectangular plate with the same width as the test bench base, and the length of the limiting strip is the same as the length of the trapezoidal groove.

[0017] Optionally, the cross-section of the limiting strip is an inverted right trapezoid.

[0018] Secondly, this utility model provides a test device for a horizontal loading test of a hydraulic support, including a hydraulic support test bench and a rear constraint fixture; the hydraulic support test bench includes a test bench base, and a plurality of limiting grooves are spaced apart on the upper surface of the test bench base; the base plate of the rear constraint fixture is placed on the upper surface of the test bench base, and at least two limiting strip positions are optionally inserted into the corresponding number of limiting grooves in the plurality of limiting grooves.

[0019] Optionally, the cross-sectional shape of the limiting groove is the same as that of the limiting strip, both being inverted right trapezoids.

[0020] (III) Beneficial Effects

[0021] The beneficial effects of this utility model are as follows: This utility model provides a rear constraint fixture and testing device for horizontal loading tests of hydraulic supports. The rear constraint fixture includes a base plate, at least two limiting strips, and a top block. The at least two limiting strips are spaced apart along the front-rear direction and vertically fixedly connected to the lower surface of the base plate, while the limiting strips extend along the left-right direction. The top block is fixedly connected to the upper surface of the base plate. The testing device includes a test bench base and the rear constraint fixture. Multiple limiting grooves are formed on the upper surface of the test bench base. The at least two limiting strips can be selectively inserted into a corresponding number of limiting grooves. The hydraulic support presses against the base plate, and its own weight presses against the limiting strips and limiting grooves to form a wedge fit, converting the gravity of the hydraulic support into a horizontal clamping force to form a self-locking effect. This restricts the movement of the rear constraint fixture in the front-rear direction on the test bench base, ensuring the stability of the rear constraint fixture during the test. The front end of the top block abuts against the rear end of the hydraulic support, supporting the hydraulic support on the rear constraint fixture and limiting the rearward movement of the hydraulic support, ensuring the stability of the hydraulic support during the horizontal loading test. Attached Figure Description

[0022] Figure 1 This is a top view schematic diagram of a rear constraint fixture for a horizontal loading test of a hydraulic support according to the present invention.

[0023] Figure 2 This is a side view schematic diagram of a rear constraint fixture for a horizontal loading test of a hydraulic support according to the present invention.

[0024] Figure 3 This is a front view schematic diagram of a hydraulic support test bench for a test device of the present invention, used for horizontal loading tests of hydraulic supports.

[0025] Figure 4 This is a rear view schematic diagram of a test device for horizontal loading tests of hydraulic supports according to the present invention, showing the fixing of the hydraulic support.

[0026] Explanation of reference numerals in the attached figures

[0027] 1: Test bench base; 11: Limiting groove;

[0028] 2: Column; 3: Loading platform; 4: Top beam; 5: Base plate; 6: Limiting strip; 7: Top block; 8: Vertical plate; 9: Rib plate; 10: Hydraulic support. Detailed Implementation

[0029] To better explain and facilitate understanding of this utility model, a detailed description of its specific embodiments is provided below with reference to the accompanying drawings. In this document, directional terms such as "upper," "lower," "front," and "rear" are used interchangeably with other directional terms. Figure 4 The orientation is used as a reference.

[0030] This utility model embodiment proposes a rear-constraint fixture and testing device for a horizontal loading test of a hydraulic support. The rear-constraint fixture includes a base plate 5, at least two limiting strips 6, and a top block 7. The at least two limiting strips 6 are spaced apart along the front-rear direction and are vertically fixedly connected to the lower surface of the base plate 5. The limiting strips 6 extend along the left-right direction and can be inserted into limiting grooves 11 on the base of the hydraulic support test bench, so that the rear-constraint fixture is positioned within the hydraulic support test bench. The top block 7 is fixedly connected to the upper surface of the base plate 5. The upper surface of the base plate 5 supports the hydraulic support 10, and the front end of the top block 7 abuts against the rear end of the hydraulic support 10, so that the hydraulic support 10 is supported on the rear-constraint fixture and its rearward movement is limited. The testing device includes a test bench base 1 and the rear-constraint fixture. Multiple limiting grooves 11 are formed on the upper surface of the test bench base 1. At least two limiting strips 6 can optionally be inserted into a corresponding number of the multiple limiting grooves 11.

[0031] Multiple limiting grooves 11 are spaced apart on the upper surface of the test bench base 1, allowing at least two limiting strips 6 of the rear constraint fixture to be selectively inserted into a corresponding number of limiting grooves 11. During the horizontal loading test of the hydraulic support 10, the hydraulic support 10 presses against the base plate 5, and its own weight presses the limiting strips 6 and the limiting grooves 11 to form a wedge fit, converting the gravity of the hydraulic support 10 into a horizontal clamping force to form a self-locking effect, which restricts the movement of the rear constraint fixture in the front-to-back direction on the test bench base 1, ensuring the stability of the rear constraint fixture during the horizontal loading test. At the same time, the front end of the top block 7 abuts against the rear end of the hydraulic support 10, so that the hydraulic support 10 is supported on the rear constraint fixture and the rearward movement of the hydraulic support 10 is limited, ensuring the stability of the hydraulic support 10 during the horizontal loading test.

[0032] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0033] Example 1:

[0034] Reference Figures 1-2A post-constraint fixture for a horizontal loading test of a hydraulic support according to an embodiment of the present invention includes a base plate 5, at least two limiting strips 6 and a top block 7.

[0035] The substrate 5 is specifically a rectangular steel plate with the same width as the test bench base 1. Specifically, the outer surface of the substrate 5 is electroplated to form a wear-resistant coating, which can resist the sliding friction and impact loads generated by the base of the hydraulic support 10 during the horizontal loading test. It should be noted that the wear-resistant coating is preferably a chromium plating, which has high hardness and can effectively improve the hardness of the outer surface of the substrate 5, preventing excessive pressure from the hydraulic support 10 on the substrate 5 and thus avoiding damage and deformation. Simultaneously, it effectively improves the wear resistance of the substrate 5 to resist the sliding friction from the base of the hydraulic support 10 on the substrate 5.

[0036] At least two limiting strips 6 are vertically fixed to the lower surface of the substrate 5 at intervals along the front-to-back direction. The limiting strips 6 extend in the left-to-right direction, with a length consistent with the trapezoidal limiting groove 11 of the test bench base 1. The cross-section of the limiting strip 6 is an inverted right trapezoid, that is, the end of the limiting strip 6 connected to the substrate 5 is larger, and the end away from the substrate 5 is smaller. During installation, the limiting strips 6 are aligned with the limiting groove 11 on the hydraulic support test bench base 1 so that the rear constraint fixture is positioned in the hydraulic support test bench. The fixture as a whole forms a stable support structure through the cooperation of the limiting strips 6 and the limiting groove 11 of the test bench base 1.

[0037] The top block 7 is a rectangular steel block, which is welded and fixed to the middle of the upper surface of the base plate 5. When the hydraulic support 10 is placed on the base plate 5, its rear end abuts against the front end of the top block 7 to ensure that the hydraulic support 10 does not move backward during the horizontal loading test.

[0038] Furthermore, the rear constraint fixture also includes a vertical plate 8 and at least two stiffening plates 9. The vertical plate 8 is specifically a rectangular steel plate, vertically welded and fixed to the upper surface of the base plate 5. The front surface of the vertical plate 8 is welded and fixed to the rear end surface of the top block 7, forming a front-to-back reinforcing structure. Specifically, the two stiffening plates 9 are right-angled trapezoidal steel plates. The right-angled sides of the stiffening plates 9 are welded and fixed to the rear surface of the vertical plate 8, and the lower base is welded and fixed to the upper surface of the base plate 5, forming a right-angled support. Alternatively, the stiffening plates 9 can also be right-angled triangular plates.

[0039] When the hydraulic support 10 abuts against the top block 7, the top block 7 can transfer the force to the vertical plate 8, avoiding local stress concentration in the top block 7, and better bearing and dispersing the force, thereby improving the load-bearing capacity and stability of the entire fixture. The stiffening plate 9 can resist the bending and shear stress generated by the vertical plate 8 under load, thereby enhancing the overall strength and load-bearing capacity of the vertical plate 8, improving the impact resistance of the top block 7, and making it suitable for loading tests of large-tonnage hydraulic supports 10.

[0040] It should be noted that the number of limit strips 6, upright plates 8, and stiffening plates 9 can be adjusted appropriately according to the magnitude of the load in the horizontal loading test.

[0041] In practice, firstly, the two limiting strips 6 are inserted into the corresponding limiting grooves 11. Then, the hydraulic support 10 is placed on the base plate 5, and the base of the hydraulic support 10 is placed against the front end face of the top block 7, ensuring that the base of the hydraulic support 10 is tightly fitted to the top block 7. The limiting strips 6 and the limiting grooves 11 cooperate to prevent the rear constraint fixture from shifting back and forth on the test bench base 1, ensuring a stable fixation. The design of the top block 7, the upright plate 8, and the stiffening plate 9 restricts the rearward movement of the base of the hydraulic support 10.

[0042] Example 2:

[0043] Reference Figures 3-4 Based on the aforementioned embodiments, this embodiment provides a test device for horizontal loading tests of hydraulic supports, which includes a hydraulic support test bench and a rear constraint fixture.

[0044] The hydraulic support test bench includes a test bench base 1. A plurality of limiting grooves 11 are spaced apart on the upper surface of the test bench base 1. The base plate 5 of the rear constraint fixture is placed on the upper surface of the test bench base 1, and at least two limiting strips are optionally inserted into a corresponding number of the multiple limiting grooves 11. For example, in Embodiment 1, where there are two limiting strips 6, the number of limiting grooves 11 is more than two. Depending on the size of the hydraulic support 10 to be placed, the two limiting strips 6 are selected to fit two appropriate limiting grooves 11 to accommodate hydraulic supports 10 of different sizes.

[0045] Furthermore, the cross-sectional shape of the limiting groove 11 and the cross-sectional shape of the limiting strip 6 are both inverted right trapezoids.

[0046] Specifically, when the limiting strip 6 is inserted into the limiting groove 11, the two inclined surfaces generate radial extrusion friction due to the interference fit. Combined with the inverted trapezoidal wedge constraint, it forms a self-locking mechanism, effectively resisting the backward displacement of the hydraulic support 10 during the horizontal loading test.

[0047] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0049] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A rear restraint tooling for hydraulic support horizontal loading test, characterized in that, The rear restraint tool for hydraulic support horizontal loading test comprises a base plate (5), at least two limiting strips (6) and a top block (7). The at least two limiting strips (6) are arranged in the front-rear direction and are fixedly connected to the lower plate surface of the base plate (5) in the vertical direction, extend in the left-right direction, and can be inserted into the limiting grooves (11) on the test bench base (1) of the hydraulic support test bench, so that the rear restraint tool is positioned in the hydraulic support test bench. The top block (7) is fixedly connected to the upper plate surface of the base plate (5), the upper plate surface of the base plate (5) is used to support the hydraulic support (10), and the front end surface of the top block (7) is used to abut against the rear end of the hydraulic support (10), so that the hydraulic support (10) is supported on the rear restraint tool and the rearward movement of the hydraulic support (10) is limited.

2. The rear restraint tooling for horizontal load testing of hydraulic supports according to claim 1, characterized in that, Further comprising a vertical plate (8). The vertical plate (8) is fixedly connected to the upper plate surface of the base plate (5) in the vertical direction and extends in the left-right direction. The front plate surface of the vertical plate (8) and the rear end surface of the top block (7) are fixedly connected.

3. The rear restraint tooling for horizontal load testing of hydraulic supports according to claim 2, characterized in that, Further comprising at least two rib plates (9). The rib plates (9) are fixedly connected to the upper plate surface of the base plate (5) in the vertical direction, the front end of the rib plate (9) is fixedly connected to the rear plate surface of the vertical plate (8), and the rib plate (9) and the vertical plate (8) are perpendicular.

4. The rear restraint tool for hydraulic support horizontal loading test according to claim 1, wherein: The base plate (5) is made of high-strength steel, and the outer surface of the base plate (5) is provided with a wear-resistant plating layer.

5. The rear restraint tool for hydraulic support horizontal loading test according to claim 1, wherein: The limiting strips (6) are fixedly connected to the base plate (5) by welding.

6. The rear restraint tool for hydraulic support horizontal loading test according to claim 1, wherein: The base plate (5) is a rectangular plate, the width of the base plate (5) is the same as the width of the test bench base (1), and the length of the limiting strips (6) is the same as the length of the limiting grooves (11).

7. The rear restraint tool for hydraulic support horizontal loading test according to claim 1, wherein: The limiting strips (6) have an inverted right-angled trapezoidal cross section.

8. A testing device for hydraulic support horizontal loading test, characterized in that, The rear restraint tool for hydraulic support horizontal loading test according to any one of claims 1-7. The hydraulic support test bench comprises a test bench base (1), and the upper surface of the test bench base (1) is provided with a plurality of limiting grooves (11). The base plate (5) of the rear restraint tool is placed on the upper surface of the test bench base (1), and the at least two limiting strips (6) are selectively inserted into a corresponding number of limiting grooves (11) in the plurality of limiting grooves (11).

9. The test device for hydraulic support horizontal loading test according to claim 8, wherein: The limiting grooves (11) have an inverted right-angled trapezoidal cross section, which is consistent with the cross section of the limiting strips (6).

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