Guard plate and hydraulic support with same

Abstract

The application provides a protection plate and a hydraulic support with the same. The protection plate comprises a bottom plate and a main rib plate. The main rib plate is arranged on the bottom plate and has an ear plug part with a pin shaft hole. The bottom plate and the main rib plate are both made of a non-metal composite material. The ear plug part is provided with a first sewing part and a second sewing part. The first sewing part is arranged around the pin shaft hole, and the second sewing part is arranged at a position of the main rib plate for connecting with the bottom plate. The first sewing part and the second sewing part are both sewn by fiber filaments. The application solves the problem that the protection plate made of a composite material in the prior art is prone to damage.

Description

Technical Field

[0001] This invention relates to the field of underground hydraulic supports in coal mines, and more specifically, to a side guard plate and a hydraulic support having the same. Background Technology

[0002] Hydraulic supports are crucial support equipment in underground coal seam mining. Before mining underground coal seams, a certain number of shafts and roadways need to be excavated. Hydraulic supports support the roof of the mining area, preventing falling rocks and providing a safe working space. Sidewalls are an important component of hydraulic supports, serving to support the coal face and prevent coal face spalling. Traditionally, sidewalls were made of metal; however, with improvements in hydraulic efficiency and the increasing size of hydraulic supports...

[0003] like Figure 5 As shown, in the prior art, the side guard plate includes a base plate 30', a main stiffener plate lug 10', a second hydraulic cylinder support 101', a first hydraulic cylinder support 100', a reinforcing rib 20', and a connecting lug 400'. The main stiffener plate lug 10', the second hydraulic cylinder support 101', the first hydraulic cylinder support 100', the reinforcing rib 20', and the connecting lug 400' are all welded to the base plate 30'. When the side guard plate is working, the first hydraulic cylinder support and the second hydraulic cylinder support are subjected to the action of the corresponding hydraulic cylinders. The hydraulic cylinder support and the main stiffening plate are prone to large interlayer stress. Due to the small thickness of the first and second hydraulic cylinder supports, they are prone to deformation. In addition, the side guards in the existing technology are made of steel. The side guards of large hydraulic supports are mostly grade 3, and the total weight is generally more than 2 tons (of which the grade 1 plate of a 7-meter support weighs more than 800 kg). The side guards are too heavy, making them inconvenient to install and move. Furthermore, metal support products are prone to rust and corrosion, which reduces the protective effect and safety.

[0004] To address this, non-metallic composite materials can be used to make the side panels. However, while non-metallic composite materials generally have high tensile strength, they also have many shortcomings:

[0005] (1) Low modulus. Under stress, the deformation is large, which can easily lead to instability, especially in large hydraulic supports, such as 7-meter hydraulic supports. The loading force of the first-stage plate cylinder is nearly 1400kN. The composite material will undergo large deformation under this strong thrust. The displacement deformation at the middle position, i.e., the first-stage cylinder support, can reach more than 15cm in the direction of force. A huge tearing force is generated at the joint between the inner ear insert main stiffener plate and the bottom plate, which can easily lead to instability and failure. The large deformation problem cannot meet the purpose of preventing spalling. In addition, there are large deformation problems at the second-stage cylinder support and the connection between the second-stage plate and the third-stage plate due to the low modulus.

[0006] (2) Low hardness. The low hardness means that when the composite material collides with coal gangue and other metal parts, the surface is damaged, and even the skeleton fiber layer is destroyed. The wear resistance of the contact surface with the coal wall is also insufficient.

[0007] (3) Although the tensile and bending properties are relatively excellent, the interlaminar stress is poor, that is, the compressive strength is poor. Under interlaminar stress, without good design, interlaminar failure may occur. When the secondary and tertiary hydraulic cylinders of the support product are providing support, compression will occur between the primary and secondary plates, and between the secondary and tertiary plates, resulting in interlaminar stress, which may cause great damage to the product.

[0008] (4) Due to limitations in size and ply direction, it is difficult to change the direction of stress in the ply to avoid interlayer stress. For example, in the joint between the main stiffener plate ear and the base plate, the ply can only be parallel to the main stiffener plate. After being subjected to the thrust of the primary hydraulic cylinder and the reverse force of the pin, a strong interlayer shear force will be generated in the ply between the ear pin hole and the base plate, and it is difficult to change the direction of stress to transform the interlayer stress into fiber tension. Interlayer shear failure is very likely to occur here. Therefore, composite materials have always been considered unable to meet the requirements for the use of support products. Summary of the Invention

[0009] The main objective of this invention is to provide a side guard plate and a hydraulic support having the same, so as to solve the problem that side guard plates made of composite materials are easily damaged in the prior art.

[0010] To achieve the above objectives, according to one aspect of the present invention, a side panel is provided, comprising: a base plate; a main stiffening plate disposed on the base plate, the main stiffening plate having an insert portion having a pin hole; wherein the base plate and the main stiffening plate are both made of non-metallic composite material; the insert portion is provided with a first sewing portion and a second sewing portion, the first sewing portion being disposed around the pin hole, and the second sewing portion being disposed at a position on the main stiffening plate for connection with the base plate; both the first sewing portion and the second sewing portion are made of fiber filaments.

[0011] Furthermore, the main stiffening plate includes a first stiffening plate layer and a second stiffening plate layer laid in sequence, with both the first and second sewing parts located on the first stiffening plate layer, and the second stiffening plate layer laid on the outside of the first stiffening plate layer; wherein, the first and second sewing parts penetrate through the opposite sides of the first stiffening plate layer, and the second stiffening plate layer is laid with unidirectional fabric.

[0012] Furthermore, both the first sewing section and the second sewing section include multiple sewing segments arranged sequentially, each sewing segment passing through the first stiffening plate layer.

[0013] Furthermore, the base plate is made of multiple layers of biaxial fabric laid sequentially, and in two adjacent layers of biaxial fabric, the fiber bundles of one layer of biaxial fabric are set at a predetermined angle with the fiber bundles of the other layer of biaxial fabric; and / or the main stiffening plate is made of unidirectional fabric.

[0014] Furthermore, the non-metallic composite material uses polymeric resin and fiber as the base material; wherein the fiber is one or two of glass fiber, carbon fiber, and BPO; and / or, the ratio between polymeric resin and fiber is 3:7 to 6:4.

[0015] Furthermore, the polymeric resin is at least one of vinyl unsaturated resin, epoxy resin, and phenolic resin; and / or the non-metallic composite material includes an antistatic agent added to the polymeric resin; and / or the non-metallic composite material includes a liquid reactive organophosphorus flame retardant.

[0016] Furthermore, the side panel also includes: a covering plate, which covers the outside of the base plate; wherein the covering plate is made of metal.

[0017] Furthermore, the side panel also includes a buffer layer sandwiched between the cover plate and the base plate; and / or the cover plate is connected to the base plate by fasteners passing through it.

[0018] Furthermore, the side plate also includes a first cylinder support, a second cylinder support, a reinforcing rib, and a connecting lug, all provided on the base plate. The main rib plate, the first cylinder support, the second cylinder support, the reinforcing rib, and the connecting lug are all integrally formed with the base plate; and / or the thickness of the base plate is greater than or equal to 4mm.

[0019] Furthermore, the side guard plate includes reinforcing ribs disposed on the base plate, the width of which is greater than or equal to 80 mm; and / or the side guard plate includes connecting lugs disposed on the base plate, the width of which is greater than or equal to 50 mm.

[0020] According to another aspect of the present invention, a hydraulic support is provided, including a side guard plate, wherein the side guard plate is as described above.

[0021] By applying the technical solution of this invention, the bottom plate and main stiffening plate of the protective panel of this application are both made of non-metallic composite material. Furthermore, by providing a first sewing part and a second sewing part on the ear plug, the first sewing part is arranged around the pin hole, and the second sewing part is arranged at the position of the main stiffening plate for connection with the bottom plate. Both the first sewing part and the second sewing part are made of fiber filaments, so as to add a larger density of fiber filaments into the first sewing part and the second sewing part, enhance the lateral force of the ear plug, thereby improving the interlaminar shear strength between the main stiffening plate and the bottom plate, meeting the torsional resistance requirements of the product, and solving the problem of easy damage to the protective panel of non-metallic composite material in the prior art.

[0022] Secondly, the side support plate also includes reinforcing ribs, a covering plate, and a buffer layer. This application increases the thickness or width of the main stiffening plate, reinforcing ribs, and bottom plate, and places the buffer layer between the covering plate and the bottom plate to protect the structure made of non-metallic composite materials. These non-metallic composite materials include polymer resins, fibers, liquid reactive organophosphorus flame retardants, and antistatic agents. By designing the mixing ratio of the non-metallic materials and the reaction temperature and time, the side support plate of this application has the following beneficial effects: While meeting the requirements for safe use in underground mines, the side support plate of this application achieves lightweight, high rigidity, high strength, flame retardancy, wear resistance, and antistatic properties; while ensuring the required strength, it reduces energy loss, improves the stability and safety of hydraulic support side support plates, and is easy to install and disassemble, making it convenient to use; it is also corrosion-resistant in the humid and acidic environment underground. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 A schematic diagram of the overall structure of an embodiment of the side panel according to the present invention is shown;

[0025] Figure 2 A schematic diagram of the sewn portion of the earplug part according to an embodiment of the protective plate of the present invention is shown;

[0026] Figure 3 A schematic diagram of the layup structure according to an embodiment of the side panel of the present invention is shown;

[0027] Figure 4 A schematic diagram of a mold structure according to an embodiment of the side guard plate of the present invention is shown;

[0028] Figure 5 A structural schematic diagram of an embodiment of a side panel according to the prior art is shown.

[0029] The above figures include the following reference numerals:

[0030] 10' Main stiffener plate lug insertion part; 101' Second hydraulic cylinder support; 100' First hydraulic cylinder support; 20' Reinforcing rib; 30' Base plate; 400' Connecting lug;

[0031] 10. Base plate; 20. Main stiffening plate; 200. Ear insert; 210. Pin hole; 201. First sewing part; 202. Second sewing part; 30. Covering plate; 40. Buffer layer; 100. First hydraulic cylinder support; 101. Second hydraulic cylinder support; 300. Reinforcing rib; 400. Connecting lug; 1. Mold; 2. Mold movable block; 3. Mold pin; 4. Baffle. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] Please refer to Figures 1 to 4 The present invention provides a side panel, comprising: a base plate 10; a main stiffening plate 20 disposed on the base plate 10, the main stiffening plate 20 having an ear-insertion portion 200 having a pin hole 210; wherein, the base plate 10 and the main stiffening plate 20 are both made of non-metallic composite material; the ear-insertion portion 200 is provided with a first sewing portion 201 and a second sewing portion 202, the first sewing portion 201 being disposed around the pin hole 210, and the second sewing portion 202 being disposed at the position of the main stiffening plate 20 for connection with the base plate 10; the first sewing portion 201 and the second sewing portion 202 are both made of fiber filaments.

[0034] The base plate 10 and main stiffening plate 20 of the protective panel of this application are both made of non-metallic composite material. Furthermore, by providing a first sewing part 201 and a second sewing part 202 on the ear-insertion part 200, the first sewing part 201 is arranged around the pin hole 210, and the second sewing part 202 is arranged at the position where the main stiffening plate 20 is connected to the base plate 10. Both the first sewing part 201 and the second sewing part 202 are made of fiber filaments, so as to add a larger density of fiber filaments into the first sewing part 201 and the second sewing part 202, thereby enhancing the lateral force of the ear-insertion part 200, thereby improving the interlaminar shear strength between the main stiffening plate 20 and the base plate 10, meeting the torsional resistance requirements of the product, and solving the problem of easy damage to the protective panels of non-metallic composite materials in the prior art.

[0035] Specifically, the main stiffening plate 20 includes a first stiffening plate layer and a second stiffening plate layer laid in sequence. The first sewing part 201 and the second sewing part 202 are both disposed on the first stiffening plate layer, and the second stiffening plate layer is laid on the outside of the first stiffening plate layer. The first sewing part 201 and the second sewing part 202 penetrate through the opposite sides of the first stiffening plate layer, and the second stiffening plate layer is laid with unidirectional fabric.

[0036] Specifically, both the first sewing section 201 and the second sewing section 202 include a plurality of sewing segments arranged in sequence, and each sewing segment is threaded through the first stiffening plate layer.

[0037] In the embodiments of this application, the base plate 10 is made of multiple layers of biaxial fabric laid sequentially, and in two adjacent layers of biaxial fabric, the fiber bundles of one layer of biaxial fabric are arranged at a predetermined angle with the fiber bundles of the other layer of biaxial fabric; and / or the main stiffening plate 20 is made of unidirectional fabric.

[0038] Optionally, the non-metallic composite material uses polymeric resin and fiber as the base material; wherein the fiber is one or two of glass fiber, carbon fiber, and BPO; and / or, the ratio between polymeric resin and fiber is 3:7 to 6:4.

[0039] Preferably, the ratio of polymeric resin to fiber is 5:5 to 4:5, at which point the mechanical properties of the resulting backing board are optimal.

[0040] Among them, glass fiber is a product with a single filament tensile strength of 2800MPa or more and a modulus of 70GPa or more, preferably glass fiber products with a single filament tensile strength of 3000MPa or more and a modulus of 80GPa or more; carbon fiber and BPO are products with a single filament tensile strength of 3000MPa or more and a modulus of 200GPa or more, preferably carbon fiber and BPO products with a single filament tensile strength of 3500MPa or more and a modulus of 230GPa or more.

[0041] In the embodiments of this application, the fiber is a fiber skeleton material. By designing the structure and layup of the side panel made of fiber skeleton material and polymer resin, the key parts of the side panel have high strength, the whole has high stiffness, and the interlayer stress of non-metallic composite materials is avoided.

[0042] Specifically, the polymer resin is a low-viscosity mixed resin. Resin matrices of general viscosity are difficult to impregnate, leading to defects during processing and poor product uniformity.

[0043] Optionally, the polymeric resin is at least one of vinyl unsaturated resin, epoxy resin, and phenolic resin; and / or the non-metallic composite material includes an antistatic agent added to the polymeric resin; and / or the non-metallic composite material includes a liquid reactive organophosphorus flame retardant.

[0044] In the specific implementation of the embodiments of this application, the molding process of the side panel adopts the vacuum introduction method, that is, the pre-laid fibers are placed into the mold, and the prepared polymer resin liquid is immersed into the mold cavity through the vacuum difference, which combines with the fibers, and then the air is degassed and cured to form the mold.

[0045] The required process conditions are: temperature 15–50℃, vacuum degree 0.01–0.05 MPa, curing time 0.5–6 h, and relative humidity less than 75%. The processing of the side panel utilizes a combined mold, with mold 1 as the main body, combined with a metal module (mold movable block 2). Mold movable block 2 is detachably installed within mold 1, meaning it is embedded within the entire mold 1 and can be removed to form the ear insert 200. The combined mold also includes a mold pin 3 to form a pin hole; the combined mold also includes a baffle 4.

[0046] The preferred mixing viscosity of the polymeric resin at 25°C is 50–160 mPa·s, and more preferably 50–100 mPa·s. In this application, reactive flame-retardant resins are not suitable, as they typically involve the introduction of large amounts of organophosphorus and other flame-retardant side groups, which increases the resin mixing viscosity and fails to meet the product's process requirements.

[0047] Specifically, 3% to 9% of an antistatic agent is added to the polymer resin. Optionally, the antistatic agent is one or a mixture of two or more liquid ethoxylated alkylamines, polyethylene oxide, and sodium polystyrene sulfonate, which improves the antistatic properties and has little impact on the processing performance and mechanical properties.

[0048] Most existing organophosphorus flame retardants are solid products, while liquid organophosphorus flame retardants are additives. Adding large amounts of solid products to polymer resins increases viscosity and reduces fluidity, making them unsuitable for the vacuum induction molding process of this product. Therefore, this application uses a liquid reactive organophosphorus flame retardant. However, adding too much liquid reactive organophosphorus flame retardant will significantly reduce the mechanical properties of the side panel. To meet the requirements for high strength mechanical properties and vacuum induction molding process performance of the side panel, this invention synthesizes an ultra-low mixed viscosity liquid reactive organophosphorus flame retardant. This liquid reactive organophosphorus flame retardant is synthesized using tri-(chloroisopropyl)-phosphate (TCPP) as the basic material, and different small-molecule organic compounds with different functional groups are selected based on the specific polymer resin used. For example, for epoxy resin, dihydroxy organic compounds are selected, preferably small molecules such as ethylene glycol. The small molecules are combined with tri-(chloroisopropyl)-phosphate (TCPP) to synthesize an ultra-low mixed viscosity reactive organophosphorus flame retardant. After the above flame retardant is added to the polymer resin, it will react with the resin matrix under curing conditions, ultimately making the flame retardant rating of the composite material reach UL-V0 level, which meets the flame retardant requirements of MT113.

[0049] In the embodiments of this application, the ear-insertion portion 200 of the main stiffening plate is circumferentially sewn with 90° unidirectional fiber filaments in a direction perpendicular to the main stiffening plate around the pin hole at the circumferential direction of the connecting pin (first sewing portion 201). The outer side of the unidirectional fiber filaments (at the edge of the main stiffening plate) adopts a unidirectional fabric 0° / 90° layup. The 90° unidirectional fiber filaments and the outer 0° / 90° unidirectional fabric layup are alternately laid with the ±45° biaxial fabric layup of the base plate. Through the above arrangement, the rigidity and torsional resistance of the product base plate can be significantly improved, avoiding instability of the product under large loads.

[0050] Specifically, the side panel also includes a covering plate 30, which covers the outside of the bottom plate 10; wherein the covering plate 30 is made of metal material.

[0051] The covering plate 30 is made of high-strength metal material; preferably, the covering plate 30 is made of Q235 or higher steel plate; the metal material (covering plate 30) is connected to the base plate by screws. By setting the covering plate 30, this application can protect the internal structure made of non-metallic composite material, so that the base plate 10 and the main stiffening plate 20 are protected by external hard or sharp objects. In addition, it can prevent the composite material from being crushed when the first-level and second-level side guard plates are squeezed by the hydraulic cylinder thrust.

[0052] Specifically, the side panel also includes a buffer layer 40, which is sandwiched between the cover plate 30 and the base plate 10; and / or the cover plate 30 is connected to the base plate 10 by fasteners passing through it.

[0053] The buffer layer 40 is made of flexible rubber material. Preferably, the flexible rubber material bonded between the cover plate and the base plate is high-elasticity rubber. This high-elasticity rubber material will further reduce the compression between the two adjacent plates and protect the product.

[0054] Specifically, the side support plate also includes a first cylinder support 100, a second cylinder support 101, a reinforcing rib 300, and a connecting lug 400 disposed on the base plate 10. Since the second cylinder support 101 will be subjected to a strong thrust, if designed as a metal material, interlayer stress will occur between the cylinder support and the main stiffening plate. Furthermore, if the same specifications of metal materials are used, the non-metallic composite material with a smaller modulus will experience greater deformation. Therefore, in this application, the main stiffening plate 20, the first cylinder support 100, the second cylinder support 101, the reinforcing rib 300, and the connecting lug 400 are all integrally formed with the base plate 10. This expands the stress-bearing area and avoids the problem of interlayer stress between the first and second cylinder supports and the base plate 10, limiting the deformation of the product under stress; and / or the thickness of the base plate 10 is greater than or equal to 4 mm to enhance the support strength of the side support plate.

[0055] The second cylinder support 101 is integrally formed with the ear plug part 200. There are multiple main stiffening plates 20 and multiple first cylinder supports 100. Multiple main stiffening plates 20 are distributed on both sides of multiple first cylinder supports 100. There are multiple pin holes 210 on each main stiffening plate 20. At least one of the multiple pin holes 210 is used for inserting a connecting pin. The connecting pin is used to connect with the crossbeam of the hydraulic support. The fiber filaments are made of high-density fiber filaments.

[0056] To further enhance the overall rigidity of the non-metallic composite material product, the side guard plate includes reinforcing ribs 300 disposed on the base plate 10, the width of the reinforcing ribs 300 being greater than or equal to 80 mm; and / or the side guard plate includes connecting lugs 400 disposed on the base plate 10, the width of the connecting lugs 400 being greater than or equal to 50 mm.

[0057] Preferably, the thickness of the base plate 10 is greater than 5 mm; the width of the reinforcing rib 300 is greater than 100 mm; and the width of the connecting lug 400 is greater than 60 mm.

[0058] Specifically, compared to the side guards made of metal materials in the prior art, the connecting lugs 400 of the side guards in this application are significantly widened. Furthermore, all transverse and longitudinal reinforcing ribs 300 can be widened or heightened without interfering with the operation of the side guards. When the side guards of this application are subjected to the pressure of the first-stage hydraulic cylinder, similar to a bending test with both ends fixed and the middle loaded, increasing the width or height of the reinforcing ribs 300 to resist the loading force is an extremely effective way to improve the rigidity and strength of the side guards.

[0059] Finite element analysis shows that when the width of the reinforcing rib increases from 20mm to 100mm, the displacement of the center point of the base plate under maximum load decreases from 16cm to 1.8mm. The combination of thickening the base plate and widening and thickening the stiffening plates (reinforcing ribs and main stiffening plates) greatly improves the overall rigidity of the non-metallic composite material product, while the specifications and dimensions of the base plate and stiffening plates also depend on the feasibility of the process.

[0060] Example:

[0061] 1) Comparative Example

[0062] like Figure 5 As shown, the first-grade plate of the 7-meter large underground hydraulic support side plate in coal mines is made of Q690 steel using traditional processes.

[0063] 2) Embodiments of this application

[0064] The primary board for manufacturing 7-meter large-scale underground hydraulic support products in coal mines, with fibers according to... Figure 2 and Figure 3 The laying process is as shown below:

[0065] (1) First, place the fibers in the corresponding cavity of the mold and arrange and lay them to form the main stiffener plate 20 and the first oil cylinder support 100.

[0066] (2) After the main stiffening plate is laid, a bundle of high-strength, high-modulus fiber filaments is woven into the first sewing part 201 and the second sewing part 202 of the ear insertion part 200 of the main stiffening plate 20 by sewing, with a 5mm interval between each sewing part. Among them, 90° unidirectional fiber sewing is used at the close proximity between the connecting pin and the pin hole (first sewing part 201) to make the fiber cloth between each layer tightly connected. The outer side of the unidirectional fiber filament adopts a 0° / 90° layup method. The outer thickness of the main stiffening plate 20 is increased by 10mm compared with the main stiffening plate of the traditional metal material side panel. The unidirectional fiber filaments and the outer unidirectional cloth 0° / 90° layup are interwoven with the bottom plate layup.

[0067] (3) Place the fiber layup of the main stiffening plate after sewing back into the mold, and continue to lay fibers into the corresponding cavity of the mold to form the reinforcing rib and the base plate; wherein, after the main stiffening plate is laid and formed, the tail end of the main stiffening plate still has excess fiber cloth, so that the main stiffening plate, the base plate and the reinforcing rib can form an integral structure in the future through the excess fiber cloth.

[0068] (4) The base plate is laid in the manner of [0° / 90° / ±45]*n, where n refers to the number of layers. The specific laying method and materials used are shown in Table 1. The "laying direction" refers to the angle between the fiber direction of a single layer of fabric and the predetermined reference direction.

[0069] (5) By using a vacuum difference, the prepared antistatic agent (the antistatic agent is sodium polystyrene sulfonate, which accounts for 5% of the epoxy resin mass), the self-synthesized ultra-low mixed viscosity liquid reactive organophosphorus flame retardant, and the epoxy resin liquid are immersed into the mold cavity and bonded with the fiber. The volume ratio of epoxy resin to fiber is 4:6. Then, the mold is cured by venting. This application makes the connection between the fabric layers tighter by using vacuum. Furthermore, by adding materials such as polymer resin and antistatic agent, the fabric layers are fixed together after venting and curing. The process conditions are: temperature 20°C, vacuum degree 0.1MPa, curing time 4h, and relative humidity 40%. In this embodiment, the liquid reactive organophosphorus flame retardant is generated by reacting tri-(chloroisopropyl)-phosphate (TCPP) and ethylene glycol in the presence of a catalyst at 50°C for 30min. The structural formula of the product is shown in the figure below.

[0070] (6) After the protective board is cured and formed, the metal mold is removed, the semi-finished product is taken off, and a flexible rubber strip is pasted on the edge between the covering plate 30 and the bottom plate 10 to form a buffer layer 40. Two screw holes are drilled on each side of the bottom plate, and the processed covering plate is fastened to the bottom plate by screwing.

[0071]

[0072] Table 1. Ply Structure and Materials

[0073]

[0074]

[0075] Table 2 Performance Comparison of Comparative Examples and Embodiments

[0076]

[0077]

[0078] As shown in Table 2 above, compared with the comparative example, the self-weight of the protective plate of this application is significantly reduced, and it has better mechanical strength and excellent corrosion resistance. From the equivalent strain shown in the finite element analysis, the non-metallic composite material of the protective plate of this application has better overall stiffness and smaller deformation, showing a slight improvement compared with the steel protective plate. The width of the base plate 10 is 1.6m, and the compressive deformation is 1.125‰, which is within the elastic deformation range of metallic materials, allowing for a good synergistic effect. The interlaminar shear strength between the pin hole of the main stiffening plate and the base plate reaches 180MPa, higher than the 150MPa required for finite element analysis, meeting the interlaminar shear strength requirements for torsion.

[0079] The product of this invention has high overall rigidity, and the deformation of the non-metallic composite material body is small during use, remaining within the range of metallic elastic deformation (≤1.9‰). This means that during product use, the metal material covering the outer side of the base plate will not undergo plastic deformation, and can have a good synergistic effect with the non-metallic composite material body to jointly bear the load. Furthermore, the steel plate is replaceable and easy to replace after corrosion or fatigue failure, reducing usage costs and extending the service life of the product body.

[0080] The present invention also provides a hydraulic support, including a side guard plate, wherein the side guard plate is the one described above.

[0081] Specifically, the hydraulic support also includes a secondary side guard plate, wherein the connecting lug 400 of the side guard plate is used to hinge with the secondary side guard plate so that the secondary side guard plate can rotate and fold relative to the side guard plate structure of the present application.

[0082] In summary, the beneficial effects of this invention are as follows:

[0083] (1) Due to the addition of reactive flame retardants and antistatic agents to the polymer resin, the flame retardant and antistatic properties of the composite material are achieved. Through the structural design and fiber layup design of the product, the designability of the composite material is reflected. By setting the first and second sewing parts at the main stiffener plate, the stress direction of the product in the key parts is strengthened and the overall rigidity is enhanced. Therefore, the coal mine underground hydraulic support side plate prepared with non-metallic composite material as the main body has excellent flame retardant and antistatic properties, can obtain high mechanical strength and bending strength, and the material weight used to achieve the corresponding strength is lighter than that of the traditional side plate.

[0084] (2) Compared with traditional metal side plates, hydraulic support side plates made of non-metallic composite materials have better corrosion resistance and fatigue resistance, which improves the stability, safety and lifespan of the side plates.

[0085] (3) The side panel of the present invention is lighter than that of traditional metal side panels, making it simple to operate, easy to install, disassemble and transport.

[0086] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0087] The base plate 10 and main stiffening plate 20 of the protective panel of this application are both made of non-metallic composite material. Furthermore, by providing a first sewing part 201 and a second sewing part 202 on the ear-insertion part 200, the first sewing part 201 is arranged around the pin hole 210, and the second sewing part 202 is arranged at the position where the main stiffening plate 20 is connected to the base plate 10. Both the first sewing part 201 and the second sewing part 202 are made of fiber filaments, so as to add a larger density of fiber filaments into the first sewing part 201 and the second sewing part 202, thereby enhancing the lateral force of the ear-insertion part 200, thereby improving the interlaminar shear strength between the main stiffening plate 20 and the base plate 10, meeting the torsional resistance requirements of the product, and solving the problem of easy damage to the protective panels of non-metallic composite materials in the prior art.

[0088] Secondly, the side support plate also includes reinforcing ribs, a covering plate, and a buffer layer. This application increases the thickness or width of the main stiffening plate, reinforcing ribs, and bottom plate, and places the buffer layer between the covering plate and the bottom plate to protect the structure made of non-metallic composite materials. These non-metallic composite materials include polymer resins, fibers, liquid reactive organophosphorus flame retardants, and antistatic agents. By designing the mixing ratio of the non-metallic materials and the reaction temperature and time, the side support plate of this application has the following beneficial effects: While meeting the requirements for safe use in underground mines, the side support plate of this application achieves lightweight, high rigidity, high strength, flame retardancy, wear resistance, and antistatic properties; while ensuring the required strength, it reduces energy loss, improves the stability and safety of hydraulic support side support plates, and is easy to install and disassemble, making it convenient to use; it is also corrosion-resistant in the humid and acidic environment underground.

[0089] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A side panel, characterized in that, include: Base plate (10); Main stiffening plate (20), the main stiffening plate (20) is disposed on the base plate (10), the main stiffening plate (20) has an ear insert (200), the ear insert (200) has a pin hole (210). The base plate (10) and the main stiffening plate (20) are both made of non-metallic composite material; the earpiece (200) is provided with a first sewing part (201) and a second sewing part (202), the first sewing part (201) is arranged around the pin hole (210), and the second sewing part (202) is arranged at the position of the main stiffening plate (20) for connection with the base plate (10); the first sewing part (201) and the second sewing part (202) are both made of fiber filaments. The first sewn part (201) is sewn around the pin hole (210) in a circumferential direction with 90° unidirectional fiber filaments in a direction perpendicular to the main stiffener plate (20); The base plate (10) is made of multiple layers of biaxial fabric laid sequentially. In two adjacent layers of biaxial fabric, the fiber bundles of one layer of biaxial fabric are set at a predetermined angle to the fiber bundles of the other layer of biaxial fabric; and / or the main stiffening plate (20) is made of unidirectional fabric. The main stiffener plate (20) includes a first stiffener plate layer and a second stiffener plate layer laid in sequence. The first sewing part (201) and the second sewing part (202) are both provided on the first stiffener plate layer, and the second stiffener plate layer is laid on the outside of the first stiffener plate layer. The first sewing part (201) and the second sewing part (202) penetrate through the opposite sides of the first stiffener plate layer, and the second stiffener plate layer is laid with unidirectional fabric. Both the first sewing part (201) and the second sewing part (202) include a plurality of sewing segments arranged in sequence, and each of the sewing segments is threaded through the first stiffening plate layer.

2. The side guard plate according to claim 1, characterized in that, The non-metallic composite material uses polymer resin and fiber as the base material; The fiber is one or two of glass fiber, carbon fiber, and BPO; and / or the ratio between the polymer resin and the fiber is 3:7 to 6:

4.

3. The side guard plate according to claim 2, characterized in that, The polymeric resin is at least one of vinyl unsaturated resin, epoxy resin, and phenolic resin; and / or The non-metallic composite material includes an antistatic agent added to the polymer resin; and / or The non-metallic composite material includes a liquid reactive organophosphorus flame retardant.

4. The side panel according to any one of claims 1 to 3, characterized in that, The side panel also includes: Covering plate (30), the covering plate (30) covers the outside of the base plate (10); The covering plate (30) is made of metal material.

5. The side guard plate according to claim 4, characterized in that, The side panel further includes a buffer layer (40), which is sandwiched between the covering plate (30) and the bottom plate (10); and / or The covering plate (30) is connected to the base plate (10) by fasteners passing through it.

6. The side panel according to any one of claims 1 to 3, characterized in that, The side support plate also includes a first cylinder support (100), a second cylinder support (101), a reinforcing rib (300), and a connecting lug (400) disposed on the base plate (10). The main rib plate (20), the first cylinder support (100), the second cylinder support (101), the reinforcing rib (300), and the connecting lug (400) are all integrally formed with the base plate (10); and / or The thickness of the base plate (10) is greater than or equal to 4 mm.

7. The side panel according to any one of claims 1 to 3, characterized in that, The side panel includes reinforcing ribs (300) disposed on the base plate (10), the width of the reinforcing ribs (300) being greater than or equal to 80 mm; and / or The side panel includes a connecting lug (400) disposed on the base plate (10), the width of the connecting lug (400) being greater than or equal to 50 mm.

8. A hydraulic support, comprising a side guard plate, characterized in that, The side panel is the side panel as described in any one of claims 1 to 7.

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