Guard device for hydraulic support base and hydraulic support base

Abstract

The present application relates to the technical field of hydraulic support for mine, and especially relates to a protection device for the base of hydraulic support and the base of hydraulic support. The protection device comprises a protection device body, which can be accommodated between a footboard and a bent cover plate of the base of hydraulic support to form a sealing blockage for the gap between the footboard and the bent cover plate. The upper surface of the protection device body is provided with a first sealing locking part capable of being locked with the footboard, and the lower surface is provided with a second sealing locking part capable of being locked with the bent cover plate, which can form a limiting fixation for the protection device body. The gap between the bent cover plate and the footboard is sealed and blocked, which can effectively prevent the coal and coal ash from entering the internal gap space of the base adjustment mechanism of the hydraulic support, prevent the actual available stroke of the extension / retraction of the base adjustment jack from being shorter and shorter, prolong the service life of the base adjustment mechanism of the hydraulic support, and improve the reliability of the base adjustment mechanism of the hydraulic support.

Description

Technical Field

[0001] This invention relates to the field of mining hydraulic support technology, and in particular to a protective device for a hydraulic support base and a hydraulic support base. Background Technology

[0002] The hydraulic support bottom adjustment mechanism is generally installed in the side cavity of the hydraulic support base. It uses high-pressure emulsion as the working medium and is mainly used to adjust the distance between adjacent hydraulic supports to correct the position of the supports. It can effectively reduce the upward and downward movement of the supports during the coal mining process. When necessary, it can also play an auxiliary guiding role during the support relocation process. It is a commonly used mechanism for hydraulic supports in fully mechanized mining faces.

[0003] In actual underground operations, the bottom adjustment mechanism often experiences serious malfunctions during use. Typical symptoms include a significantly shortened effective extension stroke of the bottom adjustment jack, jamming between the piston rod and the jack cylinder preventing normal retraction, or even complete failure. Due to the confined working space and complex environment at underground hydraulic supports in coal mines, such malfunctions are difficult to repair quickly on-site. This not only directly affects the normal movement and support operations of the hydraulic supports but also reduces the working face's advancing efficiency, adversely impacting underground safety production. This problem has been persistent and urgently requires an effective solution. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a protective device for a hydraulic support base and a hydraulic support base, which solves the problems of shortened effective extension stroke, jamming between the piston rod and the jack cylinder, and difficulty in maintenance of existing bottom-adjustment jacks during use.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] In a first aspect, the present invention provides a protective device for a hydraulic support base, comprising a protective device body that is accommodated between a foot pedal and a curved cover plate of the hydraulic support base to seal the gap between the foot pedal and the curved cover plate. The upper surface of the protective device body is provided with a first sealing locking portion capable of locking with the foot pedal, and the lower surface of the protective device body is provided with a second sealing locking portion capable of locking with the curved cover plate. The first and second sealing locking portions can limit and fix the protective device body.

[0009] Optionally, the protective device body is made of a fire-retardant, flame-retardant, and anti-static flexible material, and its gap with the foot pedal and the curved cover plate is an interference fit to form a dynamic seal.

[0010] Optionally, the protective device body is a split structure, comprising a first protective body and a second protective body. The first and second protective bodies are assembled to form an integral sealing surface.

[0011] Optionally, the first sealing locking part is a groove formed on the upper surface of the protective device body, which can be adapted to the reinforcing rib on the back of the foot pedal.

[0012] Optionally, the second sealing locking part is a boss formed on the lower surface of the protective device body. The boss can be adapted to the square through hole on the bent cover plate, and the boss and the square through hole are interference fit.

[0013] Optionally, the protective device body is provided with an L-shaped slot, and a through hole penetrating the protective device body is provided on the bottom surface of the L-shaped slot. The square through hole allows the external liquid supply line of the bottom adjusting jack to pass through the part exposed above the bent cover plate, and the through hole allows the external liquid supply line to pass through and be just accommodated in the L-shaped slot. The through hole is configured to allow interference fit with the external liquid supply line.

[0014] Optionally, the protective device body is a split structure:

[0015] The first and second protective bodies are arranged along the extension and retraction direction of the bottom-adjusting jack. The first protective body has a first semi-circular groove, and the second protective body has a second semi-circular groove. The first and second semi-circular grooves are joined together to form the through hole.

[0016] Optionally, the circumferential dimension of the boss is 3-4 mm larger than the size of the square through hole, and the thickness of the boss is 4-16 mm larger than the thickness of the curved cover plate, in order to achieve a compression seal.

[0017] Optionally, the protective device body is made of fire-retardant and anti-static foam polyurethane material, and its main body height is 3-4mm higher than the distance between the curved cover plate and the foot pedal to achieve compression sealing.

[0018] Secondly, the present invention provides a hydraulic support base, including the foot pedal, the curved cover plate, the bottom adjustment mechanism, and any of the above-mentioned protective devices.

[0019] The curved cover plate is fixedly connected to the top of the base, and the foot pedal is fixedly connected to the top of the base adjacent to the curved cover plate and located above the curved cover plate. A gap is formed between the foot pedal and the curved cover plate, and a square through hole is opened on the curved cover plate.

[0020] It includes a bottom-adjusting jack and a guide tube. The bottom-adjusting jack abuts against the inner main rib of the base, and the guide tube is sleeved on the outside of the bottom-adjusting jack. The end of the bottom-adjusting jack near the inner main rib is snapped and fixed to the guide tube. An elongated hole is opened on the guide tube at the position where the bottom-adjusting jack is connected to the external liquid supply pipeline.

[0021] The gap between the foot pedal and the curved cover plate, the square through hole on the curved cover plate, and the oblong hole on the guide cylinder are connected in sequence to form an entry channel for crushed coal / coal ash to enter the internal gap between the bottom adjusting jack and the inner main reinforcement from the outside of the base.

[0022] The protective device is housed in the gap formed between the foot pedal and the curved cover to block the entry passage.

[0023] (III) Beneficial Effects

[0024] The beneficial effects of this invention are:

[0025] This invention discloses a protective device for a hydraulic support base and a hydraulic support base. By setting the protective device body between the curved cover plate and the foot pedal, the gap between the curved cover plate and the foot pedal is sealed, blocking the channel for broken coal and coal ash to enter the base from the source. This effectively prevents the maintenance space of the bottom adjustment jack from being occupied by broken coal / coal ash, and avoids broken coal / coal ash from entering the internal gap space of the hydraulic support bottom adjustment mechanism. This prevents the actual usable stroke of the bottom adjustment jack from becoming shorter and shorter, extends the service life of the hydraulic support bottom adjustment mechanism, improves the reliability of the hydraulic support bottom adjustment mechanism, and improves the overall performance of the hydraulic support. Attached Figure Description

[0026] Figure 1 This is a perspective view (front view) of Embodiment 1 of a protective device for a hydraulic support base according to the present invention.

[0027] Figure 2 for Figure 1 Three-dimensional structural diagram of the protective device (back side);

[0028] Figure 3 To and Figure 1 A three-dimensional structural diagram of the foot pedal in conjunction with the protective device;

[0029] Figure 4 This is a perspective view (front view) of a second embodiment of the protective device for a hydraulic support base according to the present invention.

[0030] Figure 5 for Figure 4 Three-dimensional structural diagram of the protective device (back side);

[0031] Figure 6This is a perspective structural diagram of embodiment 3 of a hydraulic support base of the present invention (partially cut open at the location of the protective device).

[0032] Figure 7 for Figure 6 A 3D structural diagram of the hydraulic support base concealing the foot pedal;

[0033] Figure 8 for Figure 6 A vertical cross-sectional view of the hydraulic support base with a protective device (bottom adjustment jack retracted state).

[0034] Figure 9 for Figure 6 A vertical cross-sectional view of the hydraulic support base with a protective device (bottom adjustment jack extended state).

[0035] [Explanation of Labels in the Attached Image]

[0036] 1: Protective device body; 11: First protective body; 12: Second protective body; 13: Groove; 131: First groove; 132: Second groove; 14: Boss; 141: First boss; 142: Second boss; 15: L-shaped slot; 151: First U-shaped slot; 152: Second L-shaped slot; 16: Through hole; 161: First semi-circular groove; 162: Second semi-circular groove;

[0037] 2: Foot pedal; 21: Reinforcing rib;

[0038] 3: Curved cover plate; 31: Square through hole;

[0039] 4: Bottom adjustment mechanism; 41: Bottom adjustment jack; 42: Guide cylinder; 421: Oblong hole; 43: External liquid supply pipeline;

[0040] 5: Inner main tendon;

[0041] 6: Internal gaps. Detailed Implementation

[0042] To better explain and facilitate understanding of the present invention, a detailed description of the invention is provided below with reference to the accompanying drawings and specific embodiments. In this document, directional terms such as "up," "down," "left," and "right" are used interchangeably. Figure 1 The orientation is used as a reference.

[0043] 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.

[0044] Example 1:

[0045] This article addresses the issue of shortened effective extension stroke and jamming between the piston rod and jack cylinder during the use of bottom-adjustable jacks. Initial troubleshooting suggested that the problem stemmed from inherent structural defects in the jack itself, insufficient oil supply pressure, or damaged internal seals. Multiple repairs and improvements were made based on these findings, but the results were unsatisfactory.

[0046] Through long-term underground observation, repeated disassembly and assembly verification, and systematic cause analysis, the inventors of this invention finally identified the root cause of the malfunction as follows: Broken coal, coal ash, and fine gangue from outside the base continuously infiltrate and accumulate in the internal gap between the bottom-adjusting jack and the main rib of the base (the internal gap refers to the gap between the cylinder of the bottom-adjusting jack and the main rib of the base) through channels such as the gap between the base's curved cover plate and the foot pedal, the pre-reserved square through-hole on the curved cover plate, and the elongated hole on the guide cylinder of the bottom-adjusting mechanism. When the bottom-adjusting jack extends for operation, this gap expands, further aggravating the influx of coal slag and coal powder; and when the jack retracts, it continuously compresses and compacts the accumulated material in this area. After long-term repetitive operation, this area gradually forms a high-density, high-hardness compacted coal gangue entity, and its volume continuously increases with the use time, directly encroaching on the retraction space of the bottom-adjusting jack, causing the jack's movement to be obstructed. Ultimately, this manifests as a decreasing actual usable extension stroke, and in severe cases, even jamming and inability to retract.

[0047] In view of this, refer to Figure 1 , Figure 2 and Figure 8This embodiment proposes a protective device for a hydraulic support base, comprising a protective device body 1 with an overall plate-like structure. The protective device body 1 can be accommodated between the foot pedal 2 and the curved cover plate 3 of the hydraulic support base to seal the gap between the foot pedal 2 and the curved cover plate 3, blocking the passage of broken coal and coal ash into the base, and fundamentally preventing the bottom adjusting jack 41 from being squeezed and jammed by coal slag, and the problem of shortened effective stroke. The protective device body 1 is made of a fire-retardant, flame-retardant, and anti-static flexible material. The gap between it and the foot pedal 2 and the curved cover plate 3 is an interference fit. Depending on the flexible material selected, the interference amount can be between 2-9mm to form a dynamic seal on the full contact surface. It can also be understood that the protective device body 1 is pressed tightly in the gap between the foot pedal 2 and the curved cover plate 3. After installation, the protective device body 1 is in a compressed state. The upper surface of the protective device body 1 contacts the lower surface of the foot pedal 2 to form a sealing surface, and the lower surface of the protective device body 1 contacts the upper surface of the curved cover plate 3 to form a sealing surface. The flexible material is preferably fire-retardant and anti-static polyurethane foam (a special polymer foam material with dual safety functions of self-extinguishing upon removal of flame and prevention of static electricity accumulation). It has good flexibility, compression resilience, and adaptability to the downhole environment, and can accommodate assembly errors and slight deformations between the curved cover plate 3 and the foot pedal 2. When using polyurethane foam, it is preferable that the height of the main body 1 of the protective device is 3-4 mm higher than the distance between the curved cover plate 3 and the foot pedal 2 to achieve a durable dynamic compression seal.

[0048] Furthermore, a first sealing and locking part capable of locking with the foot pedal 2 is provided on the upper surface of the protective device body 1. In this embodiment, the first sealing and locking part is a groove 13 formed on the upper surface of the protective device body 1. The shape and size of the groove 13 are adapted to the contour of the reinforcing rib 21 on the back of the foot pedal 2 (e.g., Figure 3 The groove 13 is preferably a semi-elongated circular hole shape to achieve the best effect. During installation, the reinforcing rib 21 is embedded in the groove 13 to achieve upper and lower limit and circumferential positioning.

[0049] A second sealing locking part is provided on the lower surface of the protective device body 1, which can be locked with the curved cover plate 3. The second sealing locking part is a boss 14 formed on the lower surface of the protective device body 1. The boss 14 can be adapted to the square through hole 31 on the curved cover plate 3, and the boss 14 and the square through hole 31 are interference fit, that is, the boss 14 and the square through hole 31 have the same shape and correspond in position. In order to ensure a suitable interference amount, it is preferable that the circumferential dimension of the boss 14 is 3-4mm larger than the size of the square through hole 31, and the thickness of the boss 14 is 4-16mm larger than the thickness of the curved cover plate 3. During installation, the boss 14 is compressed and embedded into the square through hole 31, forming an interference fit with the hole wall to achieve compression sealing. At this time, the outer peripheral wall of the boss 14 contacts the inner peripheral wall of the square through hole 31 to form a sealing surface, which can completely block the square through hole 31, the main slag inlet channel, and firmly lock the protective device body 1 on the curved cover plate 3 to prevent the protective device body 1 from moving, further improving the overall positioning reliability and sealing effect. In this way, the first sealing locking part and the second sealing locking part can work together to form a stable limiting and fixing of the protective device body 1, so as to prevent the protective device body 1 from moving, tilting or falling off during downhole vibration and support movement, and ensure long-term reliable sealing.

[0050] See also Figure 1 The protective device body 1 is also provided with an L-shaped slot 15, the direction of which is consistent with the arrangement path of the external liquid supply pipeline 26 of the bottom adjusting jack 41. Furthermore, a through hole 16 penetrating the protective device body 1 is provided on the bottom surface of the L-shaped slot 15. This square through hole 31 allows the external liquid supply pipeline 43 of the bottom adjusting jack 41 to pass through its portion exposed above the bent cover plate 3. The through hole 16 allows the external liquid supply pipeline 43 to pass through it and fit perfectly within the L-shaped slot 15. Alternatively, it can be understood that the portion of the external liquid supply pipeline 43 exposed above the bent cover plate 3 is perfectly fitted within the L-shaped slot 15. The inner diameter of the through hole 16 is slightly smaller than the outer diameter of the external liquid supply pipeline 26, so that the through hole 16 is configured to allow for an interference fit with the external liquid supply pipeline 26. In this way, without affecting the normal arrangement of the liquid supply pipeline, a full circumferential seal is achieved at the pipeline exit point, completely eliminating the slag inlet gap around the pipeline.

[0051] The protective device in this embodiment is easy to install and provides continuous sealing. Through the multiple positioning and sealing mechanisms of the groove 13, boss 14, L-shaped slot 15, and through hole 16, it achieves full coverage sealing of the gap between the foot pedal 2 and the curved cover plate 3, the square through hole 31, and the exit point of the external liquid supply pipe 26. This effectively blocks the entry of broken coal and coal ash into the base, preventing them from entering the internal gap space of the hydraulic support bottom adjustment mechanism 4. It ensures that the extension and retraction space of the bottom adjustment jack 41 is not encroached upon, maintaining a stable effective stroke and preventing the actual usable extension / retraction stroke from becoming increasingly shorter. Simultaneously, it ensures smooth operation of the bottom adjustment jack 41, preventing piston rod jamming and failure to retract properly. This significantly reduces the failure rate of the bottom adjustment mechanism 4, extends its service life, and improves reliability. Therefore, it improves the overall performance of the hydraulic support, reduces the frequency of downtime for maintenance, and ensures normal underground operations. Meanwhile, the protective device body 1 is made of fire-retardant, flame-retardant, and anti-static flexible material, which not only meets the special environmental requirements of underground coal mines, but also has a light overall weight, facilitating transportation, inspection, and maintenance. In actual use, no special tools are required, and it is easy to assemble and disassemble, greatly reducing the labor intensity of underground coal mine workers.

[0052] It should be noted that the protective device in this embodiment is an integrated structure, which is suitable for simultaneous installation when the external liquid supply line 26 is installed on the base. That is, when installing the hose, elbow and other components in the external liquid supply line 26, the elbow needs to pass through the protective device body 1 before being assembled with the hose.

[0053] Example 2:

[0054] Reference Figure 4 , Figure 5 This embodiment presents a protective device for a hydraulic support base, which differs from Embodiment 1 in that the protective device body 1 is a split structure, facilitating installation, replacement, and maintenance in confined underground spaces. All other parts are the same as in Embodiment 1, and therefore will not be described further here.

[0055] Specifically, the protective device body 1 includes a first protective body 11 and a second protective body 12. The first protective body 11 and the second protective body 12 are arranged along the extension and retraction direction of the bottom adjusting jack 41. After assembly, they form an integral sealing surface (i.e., the upper surface of the protective device body 1 that can completely fit with the lower surface of the foot pedal 2 in Embodiment 1), jointly sealing the gap between the foot pedal 2 and the curved cover plate 3. The first protective body 11 and the second protective body 12 are also preferably made of fire-retardant, flame-retardant, and antistatic foam polyurethane material. They are both interference-fitted with the curved cover plate 3 and the foot pedal 2. After assembly, the overall height is also higher than the distance between the foot pedal 2 and the curved cover plate 3, maintaining an overall compressed and sealed state.

[0056] Then, a first sealing and locking part is respectively provided on the first protective body 11 and the second protective body 12. That is, a first groove 131 is provided on the upper surface of the first protective body 11, and a second groove 132 is provided on the upper surface of the second protective body 12. The first groove 131 and the second groove 132 are joined together to form a complete groove 13 (i.e., the first sealing and locking part), which matches the reinforcing rib 21 welded to the back of the foot pedal 2 to achieve the limiting function. If the reinforcing rib 21 is circular, then both the first groove 131 and the second groove 132 are semi-circular grooves. Meanwhile, a second sealing and locking part is provided on the first protective body 11 and the second protective body 12 respectively. That is, a first boss 141 is provided on the lower surface of the first protective body 11, and a second boss 142 is provided on the lower surface of the second protective body 12. The first boss 141 and the second boss 142 are assembled together to form a complete boss 14 (i.e., the second sealing and locking part), which matches the square through hole 31 on the curved cover plate 3 to achieve a sealing effect, preventing broken coal / coal ash from entering the bottom adjustment mechanism, and at the same time achieving a limiting effect to prevent the position of the main body 1 of the protective device from shifting. In order to adapt to the shape of the square through hole 31, the first boss 141 and the second boss 142 are both cuboid structures, and have chamfers of the same size at the positions where they match the chamfers around the through hole 31. Here, the first sealing and locking part and the second sealing and locking part are respectively provided on the first protective body 11 and the second protective body 12, so that the separate first protective body 11 and the second protective body 12 can be stably positioned.

[0057] Furthermore, the joint between the first protective body 11 and the second protective body 12 is preferably located at the center of the through hole 16. That is, the first protective body 11 is provided with a first semi-circular groove 161, and the second protective body 12 is provided with a second semi-circular groove 162. The first semi-circular groove 161 and the second semi-circular groove 162 are joined together to form a complete through hole 16, which is used to pass through the external liquid supply pipe 26 of the bottom adjusting jack 41. The through hole 16 formed by joining together is still an interference fit with the external liquid supply pipe 26 to achieve a seal around the pipe. Correspondingly, the first protective body 11 is provided with a first U-shaped groove 151, and the second protective body 12 is provided with a second L-shaped groove 152. The L-shaped open end of the second L-shaped groove 152 faces the extension side of the U-shaped opening of the first U-shaped groove 151, so that the first U-shaped groove 151 and the second L-shaped groove 152 are joined together to form a complete L-shaped groove 15, which is used to accommodate the part of the external liquid supply pipeline 26 that passes through the square through hole 31 and is exposed above the bent cover plate 3.

[0058] The split-type protective device in this embodiment allows the first protective body 11 and the second protective body 12 to be installed from the side without disassembling other components, significantly reducing the difficulty of downhole installation and replacement. After assembly, a continuous sealing surface is formed, with sealing performance consistent with the integrated structure, while avoiding problems such as installation jamming and deformation caused by the large overall size, making it more versatile.

[0059] Example 3:

[0060] Reference Figures 6 to 9 This embodiment provides a hydraulic support base, including a foot pedal 2, a curved cover plate 3, and a bottom adjustment mechanism 4. It also integrates any of the protective devices in Embodiment 1 or Embodiment 2 to completely block the passage of crushed coal and coal ash into the bottom adjustment mechanism 4 from a structural perspective, thereby solving the technical problems of jamming of the bottom adjustment jack 41 and shortening of the effective stroke.

[0061] Specifically, the curved cover plate 3 is fixedly connected to the top of the base, and the foot pedal 2 is fixedly connected to the top of the base adjacent to the curved cover plate 3 and located above the curved cover plate 3, with a gap between the foot pedal 2 and the curved cover plate 3. A square through hole 31 is provided on the curved cover plate 3.

[0062] The bottom adjustment mechanism 4 is located in the transverse cavity on the side of the base, including a bottom adjustment jack 41 and a guide cylinder 42. The bottom adjustment jack 41 abuts against the inner main rib 5 of the base, and the inner main rib 5 serves as its main load-bearing point when the bottom adjustment jack 41 is working. The guide cylinder 42 is sleeved on the outside of the bottom adjustment jack 41 and fixed to the base. The end of the bottom adjustment jack 41 near the inner main rib 5 is snapped and fixed to the guide cylinder 42. Specifically, a circular through hole is provided at the end of the piston rod of the bottom adjustment jack 41, and a through hole adapted to the circular through hole is opened on the guide cylinder 42. A pin passes through the end of the piston rod and the through hole of the guide cylinder 42, and a small pin is installed on the upper ear plate of the guide cylinder 42 to achieve axial limiting of the piston rod. During operation, under the action of hydraulic oil, the cylinder of the bottom adjustment jack 41 can extend axially to the outside of the base (e.g., Figure 9 Furthermore, an elongated hole 421 is provided on the guide cylinder 42 at the position corresponding to the connection between the bottom adjustment jack 41 and the external liquid supply line 43, in order to avoid the liquid supply line connection structure of the bottom adjustment jack 41.

[0063] Without protective devices, the gap between the foot pedal 2 and the curved cover plate 3, the square through hole 31 on the curved cover plate 3, and the oblong hole 421 on the guide cylinder 42 are connected in sequence, forming an entry channel for pulverized coal / coal ash to enter from outside the base into the internal gap 6 between the bottom adjusting jack 41 and the inner main rib 5. As the cylinder extends, the space of the internal gap 6 between the cylinder of the bottom adjusting jack 41 and the inner main rib 6 increases, further aggravating the influx of coal slag and coal powder. When the cylinder retracts, it will continuously squeeze and compact the accumulated material in this area, eventually causing the movement between the cylinder and the piston rod to become stuck or the effective stroke to be shortened. Moreover, the accumulation of pulverized coal / coal ash at the connection between the piston rod of the jack 41 and the external liquid supply pipeline 43 (the location where the square through hole 31 is opened on the curved cover plate 3) will encroach on the maintenance space of the bottom adjusting jack 41.

[0064] In this embodiment, the protective device is housed within the gap formed between the foot pedal 2 and the curved cover plate 3 to block the entry channel at its source. That is, the protective device body 1 is pressed tightly into the gap between the foot pedal 2 and the curved cover plate 3. The groove 13 on the upper surface of the protective device body 1 abuts against the reinforcing rib 21 on the back of the foot pedal 2, and the boss 14 on the lower surface of the protective device body 1 is embedded in the square through hole 31 of the curved cover plate 3. This allows the groove 13 on the upper surface to fit and position itself against the reinforcing rib 21 on the back of the foot pedal 2, while the boss 14 on the lower surface compresses and seals the square through hole 31 of the curved cover plate 3. The L-shaped groove 15 and the through hole 16 enclose and seal the external liquid supply pipe 26, thereby completely blocking the entry channel.

[0065] In this embodiment, the hydraulic support base prevents external coal and ash from entering the internal gap 6 between the bottom-adjusting jack 41 and the inner main rib 5 during operation. This means they won't enter the space between the cylinder of the bottom-adjusting jack 41 and the inner main rib 5. During the cylinder's extension and retraction, the coal / ash won't be repeatedly compressed to form a compacted mass, ensuring sufficient extension and retraction space for the bottom-adjusting jack 41 and preventing its effective stroke from being restricted. Simultaneously, the connection between the piston rod of the bottom-adjusting jack 41 and the external hydraulic supply line 43 (the location of the square through hole 31 in the bent cover plate 3) won't be blocked by coal / ash, guaranteeing sufficient space for maintenance and repair. This effectively solves the problems of malfunction and inconvenient maintenance associated with the bottom-adjusting jack 41, enabling long-term stable adjustment of support spacing, position correction, prevention of upward and downward movement, and support guidance functions. This significantly improves the operational reliability of the hydraulic support and the efficiency of underground mining, while reducing maintenance costs and safety hazards.

[0066] In the description of this invention, 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 invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" 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," or "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.

[0069] 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.

[0070] 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 protective device for a hydraulic support base, characterized in that, Includes a protective device body (1), which can be accommodated between the foot pedal (2) and the curved cover plate (3) of the hydraulic support base to form a sealing seal between the foot pedal (2) and the curved cover plate (3); The upper surface of the protective device body (1) is provided with a first sealing locking part that can be locked with the foot pedal (2), and the lower surface of the protective device body (1) is provided with a second sealing locking part that can be locked with the curved cover plate (3). The first sealing locking part and the second sealing locking part can limit and fix the protective device body (1).

2. The protective device for a hydraulic support base as described in claim 1, characterized in that: The protective device body (1) is made of fire-retardant and anti-static flexible material, and the gap between it and the foot pedal (2) and the curved cover plate (3) is an interference fit to form a dynamic seal.

3. The protective device for a hydraulic support base as described in claim 2, characterized in that: The protective device body (1) is a split structure, which includes a first protective body (11) and a second protective body (12). The first protective body (11) and the second protective body (12) are assembled to form an integral sealing surface.

4. The protective device for a hydraulic support base as described in any one of claims 2 or 3, characterized in that: The first sealing and locking part is a groove (13) formed on the upper surface of the protective device body (1), and the groove (13) can be adapted to the reinforcing rib (21) on the back of the foot pedal (2).

5. The protective device for a hydraulic support base as described in any one of claims 2 or 3, characterized in that: The second sealing locking part is a boss (14) formed on the lower surface of the protective device body (1). The boss (14) can be adapted to the square through hole (31) on the bent cover plate (3), and the boss (14) and the square through hole (31) are interference fit.

6. The protective device for a hydraulic support base as described in claim 5, characterized in that: The protective device body (1) is provided with an L-shaped slot (15), and a through hole (16) penetrating the protective device body (1) is provided on the bottom surface of the L-shaped slot (15). The square through hole (31) allows the external liquid supply line (43) of the bottom adjusting jack (41) to pass through the portion of it exposed above the bent cover plate (3), and the through hole (16) allows the external liquid supply line (43) to pass through it and be just accommodated in the L-shaped slot (15), and the through hole (16) is configured to be able to interfere with the external liquid supply line (26).

7. The protective device for a hydraulic support base as described in claim 6, characterized in that: The protective device body (1) has a split structure: The first protective body (11) and the second protective body (12) are arranged along the extension and retraction direction of the bottom adjustment jack (41), and the first protective body (11) is provided with a first semi-circular groove (161), and the second protective body (12) is provided with a second semi-circular groove (162). The first semi-circular groove (161) and the second semi-circular groove (162) are joined together to form the through hole (16).

8. The protective device for a hydraulic support base as described in claim 5, characterized in that: The circumferential dimension of the boss (14) is 3-4 mm larger than the size of the square through hole (31), and the thickness of the boss (14) is 4-16 mm larger than the thickness of the curved cover plate (3) to achieve compression sealing.

9. The protective device for a hydraulic support base as described in claim 2, characterized in that: The protective device body (1) is made of fire-retardant and anti-static foam polyurethane material. Its main body height is 3-4mm higher than the distance between the curved cover plate (3) and the foot pedal (2) to achieve compression sealing.

10. A hydraulic support base, characterized in that, Includes the foot pedal (2), the curved cover plate (3), the bottom adjustment mechanism (4), and the protective device according to any one of claims 1-9; The curved cover plate (3) is fixedly connected to the top of the base, and the foot pedal (2) is fixedly connected to the top of the base adjacent to the curved cover plate (3) and located above the curved cover plate (3). A gap is formed between the foot pedal (2) and the curved cover plate (3), and the square through hole (31) is provided on the curved cover plate (3). The bottom adjustment mechanism (4) is located in the transverse cavity on the side of the base and includes a bottom adjustment jack (41) and a guide cylinder (42). The bottom adjustment jack (41) abuts against the inner main rib (5) of the base. The guide cylinder (42) is sleeved on the outside of the bottom adjustment jack (41), and the end of the bottom adjustment jack (41) near the inner main rib (5) is snapped and fixed to the guide cylinder (42). An elongated hole (421) is provided on the guide cylinder (42) at the position where the bottom adjustment jack (41) is connected to the external liquid supply pipeline (43). The gap between the foot pedal (2) and the curved cover plate (3), the square through hole (31) on the curved cover plate (3) and the oblong hole (421) on the guide cylinder (42) are connected in sequence to form an entry channel for crushed coal / coal ash to enter the internal gap (6) between the bottom adjusting jack (41) and the inner main rib (5) from the outside of the base; The protective device is housed in the gap formed between the foot pedal (2) and the curved cover plate (3) to block the entry passage.

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