Limiting device for articulated shaft of front beam of hydraulic support for coal mine

Abstract

A hydraulic support front beam hinge shaft limiting device for a coal mine comprises a front beam and two hinge shafts, the two hinge shafts are correspondingly inserted into hinge holes of top beam box type inner main ribs on the left side and the right side of the rear end of the front beam respectively, and annular grooves are formed in the outer circumferences of the ends, inwards penetrating through the hinge holes of the top beam box type inner main ribs, of the hinge shafts. A cover plate assembly is fixedly connected between two inner side lug plates in the middle of the rear end of the front beam, the left side portion and the right side portion of the cover plate assembly are each movably provided with a limiting clamping and fixing assembly of the same structure, and the limiting clamping and fixing assembly on the left side is clamped with an annular groove in the end of a hinge shaft on the left side in a matched mode. The limiting clamping fixing assembly on the right side is clamped with the annular groove in the end of the hinge shaft on the right side in a matched mode. The front beam hinge shaft limiting device is designed to be disassembled in an exposed mode, the problem that the front beam hinge shaft is difficult to disassemble and assemble due to narrow operation space can be solved, the hinge shaft is limited and fixed through the limiting plate, the structural strength is high, reliability is high, and loss is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mining equipment, in particular to a hydraulic support front beam hinge shaft limiting device for coal mines. Background Art

[0002] Coal mine hydraulic support is one of the most important equipment in comprehensive mining equipment. In addition to effectively protecting the safety of personnel in the coal mining face, it is also the main equipment for high production and efficiency of the comprehensive mining face. However, the articulated shafts of the hydraulic support are wearing parts. In order to ensure the quality, they need to be replaced regularly. The replacement time directly affects the mining efficiency of the working face.

[0003] At present, the articulated shaft limit device of the front beam and the shield beam of the hydraulic support is usually located between the beam body and the side guard plate. Due to structural limitations, the space where the existing articulated shaft limit device is located is small, which is not conducive to disassembly and assembly in actual underground scenarios.

[0004] Chinese utility model patent CN2014208085037 discloses a limit device for the rear connecting rod articulated shaft of a hydraulic support base for coal mines, and the limit pin can be installed from the outside of the base, which is convenient for disassembly and assembly. However, the limit device for the rear connecting rod articulated shaft of the hydraulic support base for coal mines has many parts, and the limit pin needs to be removed when disassembling the articulated shaft, and there is no storage position on the hydraulic support, which is easy to lose due to frequent operations; furthermore, two limit pins are inserted on both sides of the annular groove of the articulated shaft to limit and fix the articulated shaft with a chopstick structure, which has a thin structure and poor reliability.

[0005] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention

[0006] The purpose of the utility model is to address the deficiencies in the prior art and thereby provide a front beam articulated shaft limiting device for a hydraulic support for a coal mine. The front beam articulated shaft limiting device of the utility model is designed for external disassembly and assembly, which can solve the problem that the front beam articulated shaft is difficult to disassemble and assemble due to a small operating space. The utility model has relatively few parts and a simple structure. A limiting plate is used to limit and fix the articulated shaft. The utility model has high structural strength, strong reliability, and prevents loss.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a front beam hinge shaft limiting device for a hydraulic support for coal mines, comprising a front beam and two hinge shafts, the two hinge shafts are respectively inserted into the hinge holes of the main reinforcement of the top beam box-type on the left and right sides of the rear end of the front beam, and an annular groove is provided on the outer circumference of the end of the hinge shaft passing through the hinge hole of the main reinforcement of the top beam box-type. A cover plate assembly is fixedly connected between the two inner ear plates in the middle of the rear end of the front beam, and a limiting clamping and fixing assembly with the same structure is movably installed on the left and right sides of the cover plate assembly respectively, the limiting clamping and fixing assembly on the left side is matched and clamped with the annular groove at the end of the left hinge shaft, and the limiting clamping and fixing assembly on the right side is matched and clamped with the annular groove at the end of the right hinge shaft.

[0008] Based on the above, the cover plate assembly includes a cover plate body, which is welded between the two inner ear plates in the middle of the rear end of the front beam. Square notches are opened in the middle of the left side and the middle of the right side of the cover plate body. The two square notches correspond to the annular grooves at the ends of the two hinge shafts one by one. A limiting ear plate located at the bottom of the cover plate body is welded at the inner end of the square notch on the cover plate body, and a first pin hole is opened on the limiting ear plate to connect with the limiting clamping fixing assembly.

[0009] Based on the above, the limiting clamping and fixing assembly includes a limiting plate, a pin shaft and a cotter pin. The limiting plate is a long strip plate adapted to the width of the square notch. The thickness of the limiting plate is adapted to the groove width of the annular groove. Two second pin holes spaced apart from each other are opened on the lower side of the limiting plate. The limiting plate vertically passes through the corresponding square notch and its upper side edge is embedded in the annular groove at the end of the corresponding hinge shaft. The second pin hole on the lower side corresponds to the first pin hole on the limiting ear plate in the corresponding square notch on the left and right and is connected through the pin shaft. The cotter pin is installed at the end of the pin shaft to lock the pin shaft.

[0010] Based on the above, the upper side of the limiting plate is provided with an arc-shaped notch that matches the circumference of the annular groove.

[0011] The utility model has substantial characteristics and progress compared with the prior art. Specifically, the beneficial effects of the utility model are:

[0012] (1) The limiting device of the front beam articulated shaft of the hydraulic support for coal mines is designed to be disassembled and assembled externally, which can solve the problem that the front beam articulated shaft is difficult to disassemble and assemble due to the narrow operating space, and has relatively few parts and a simple structure;

[0013] (2) The limit plate for limiting and fixing the hinge shaft is an integral steel plate with high structural strength and strong reliability;

[0014] (3) When removing the articulated shaft, there is no need to completely remove the limit plate. You only need to pull the limit plate out a certain distance (the distance between the two second pin holes on the limit plate) so that the second pin hole on the upper side of the limit plate corresponds to the first pin hole on the limit ear plate in the corresponding square notch and is connected with a pin shaft. This allows the position of the limit plate to be fixed while removing the articulated shaft to prevent it from being lost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the installation of the utility model on the front beam.

[0016] Figure 2 It is a partial schematic diagram of the structure of the utility model.

[0017] Figure 3 It is a structural schematic diagram of the hinge shaft of the utility model.

[0018] Figure 4 It is the axial view of the cover assembly of the utility model. Figure 1 .

[0019] Figure 5 It is the axial view of the cover assembly of the utility model. Figure 2 .

[0020] Figure 6 It is a structural schematic diagram of the limiting plate of the utility model.

[0021] Figure 7 It is a schematic diagram of the hinged connection between the front beam and the shield beam of the utility model.

[0022] In the figure: 1. front beam; 2. hinge shaft; 3. shielding beam; 4. annular groove; 5. cover plate body; 6. square notch; 7. limiting ear plate; 8. first pin hole; 9. limiting plate; 10. pin shaft; 11. cotter pin; 12. second pin hole; 13. arc-shaped notch; 14. cover plate; 15. inner ear plate; 16. outer main reinforcement of shielding beam; 17. inner main reinforcement of shielding beam; 18. reinforcing rib; 19. inner main reinforcement of top beam box; 20. outer ear plate. DETAILED DESCRIPTION

[0023] The technical solution of the utility model is further described in detail below through specific implementation methods.

[0024] like Figure 1 to Figure 7As shown, a front beam articulation shaft limiting device for a hydraulic support for a coal mine comprises a front beam 1 and two articulation shafts 2. The two articulation shafts 2 are respectively inserted into the articulation holes of the main reinforcement 19 in the top beam box type on the left and right sides of the rear end of the front beam 1, and are used for articulation with a shielding beam 3. An annular groove 4 is provided on the outer circumference of the end of the articulation shaft 2 that passes inward through the articulation hole of the main reinforcement 19 in the top beam box type. A cover plate assembly is fixedly connected between the two inner ear plates 15 in the middle of the rear end of the front beam 1. A limit clamping and fixing assembly with the same structure is movably installed on the left and right sides of the cover plate assembly respectively. The limit clamping and fixing assembly on the left side is matched and clamped with the annular groove 4 at the end of the left articulation shaft 2, and the limit clamping and fixing assembly on the right side is matched and clamped with the annular groove 4 at the end of the right articulation shaft 2.

[0025] The cover plate assembly includes a cover plate body 5, which is welded between two inner ear plates 15 in the middle of the rear end of the front beam 1. A square notch 6 is provided in the middle of the left side and the middle of the right side of the cover plate body 5. The two square notches 6 correspond to the annular grooves 4 at the ends of the two hinge shafts 2 one by one. A limiting ear plate 7 located at the bottom of the cover plate body 5 is welded at the inner end of the square notch 6 on the cover plate body 5. The limiting ear plate 7 is provided with a first pin hole 8 connected to the limiting clamping fixing assembly. In order to strengthen the welding strength of the limiting ear plate 7, a reinforcing rib 18 of a C-shaped structure is welded between the outer periphery of the upper end of the limiting ear plate 7 and the top surface of the cover plate body 5.

[0026] The limiting clamping and fixing assembly includes a limiting plate 9, a pin shaft 10 and a cotter pin 11. The limiting plate 9 is a long strip plate adapted to the width of the square notch 6. The thickness of the limiting plate 9 is adapted to the groove width of the annular groove 4. The lower side of the limiting plate 9 is provided with two second pin holes 12 spaced apart from each other. The limiting plate 9 vertically passes through the corresponding square notch 6 and its upper side is embedded in the annular groove 4 at the end of the corresponding hinge shaft 2. The second pin hole 12 on the lower side corresponds to the first pin hole 8 on the limiting ear plate 7 in the corresponding square notch 6 and is connected through the pin shaft 10. The cotter pin 11 is installed at the end of the pin shaft 10 to lock the pin shaft 10.

[0027] The upper side of the limiting plate 9 is provided with an arc-shaped notch 13 which matches the circumference of the annular groove 4 , thereby increasing the circumference of the engagement with the annular groove 4 .

[0028] The installation process of the hinge shaft 2 of this embodiment is as follows: first, the main reinforcements of the front beam 1 and the shield beam 3 are staggered and aligned according to the position of the hinge holes, and then the hinge shaft 2 is inserted from the hinge hole of the outer main reinforcement of the shield beam, through the outer ear plate 20, the cover plate 14, the main reinforcement 19 inside the top beam box, the main reinforcement 17 inside the shield beam and the hinge hole of the inner ear plate 15. When the hinge shaft 2 reaches the specified position, the annular groove 4 at the end of the hinge shaft 2 is just above the corresponding square notch 6, and then the limit plate 9 is passed from the bottom of the cover body 5 through the corresponding square notch 6, so that The arc-shaped notch 13 on the upper side of the limiting plate 9 is embedded in the annular groove 4 at the end of the hinge shaft 2 to limit the left and right movement of the hinge shaft 2. At this time, the second pin hole 12 on the lower side of the limiting plate 9 corresponds to the first pin hole 8 on the limiting ear plate 7 in the corresponding square notch 6. The pin shaft 10 is inserted from the first pin hole 8 on the limiting ear plate 7 in the corresponding square notch 6 and passes through the second pin hole 12 on the lower side of the limiting plate 9, and then the cotter pin 11 is used to lock the pin shaft 10. In this way, the installation and limiting operation of the hinge shaft 2 are completed. If the hinge shaft 2 is to be removed, it can be removed in the reverse order of the installation of the hinge shaft 2. When removing the hinge shaft 2, the limit plate 9 can be pulled out in the opposite direction for a certain distance (the distance between the two second pin holes 12 on the limit plate 9), so that the upper second pin hole 12 on the limit plate 9 corresponds to the first pin hole 8 on the limit ear plate 7 in the corresponding square notch 6 and is connected with the pin shaft 10, so as to fix the position of the limit plate 9 while removing the hinge shaft 2 to prevent it from being lost.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A front beam hinge shaft limiting device for a hydraulic support for coal mines, comprising a front beam and two hinge shafts, the two hinge shafts being respectively inserted into hinge holes of the main reinforcements of the top beam box on the left and right sides of the rear end of the front beam, characterized in that: An annular groove is provided on the outer circumference of the end portion of the hinge hole of the main reinforcement in the top beam box type, and a cover plate assembly is fixedly connected between the two inner ear plates in the middle of the rear end of the front beam. The left and right sides of the cover plate assembly are respectively movably installed with a limit clamping and fixing assembly with the same structure. The limit clamping and fixing assembly on the left side is matched and clamped with the annular groove at the end portion of the left hinge shaft, and the limit clamping and fixing assembly on the right side is matched and clamped with the annular groove at the end portion of the right hinge shaft.

2. The front beam articulated shaft limiting device for a hydraulic support for coal mines according to claim 1 is characterized in that: The cover plate assembly includes a cover plate body, which is welded between two inner ear plates in the middle of the rear end of the front beam. Square notches are opened in the middle of the left side and the middle of the right side of the cover plate body. The two square notches correspond to the annular grooves at the ends of the two hinge shafts one by one. A limiting ear plate located at the bottom of the cover plate body is welded at the inner end of the square notch on the cover plate body, and a first pin hole is opened on the limiting ear plate to connect with the limiting clamping fixing assembly.

3. The limit device for the hinged shaft of the front beam of the hydraulic support for coal mines according to claim 2 is characterized in that: The limiting clamping and fixing assembly includes a limiting plate, a pin shaft and a cotter pin. The limiting plate is a long strip plate that is adapted to the width of the square notch. The thickness of the limiting plate is adapted to the groove width of the annular groove. Two second pin holes spaced apart from each other are provided on the lower side of the limiting plate. The limiting plate vertically passes through the corresponding square notch and its upper side is embedded in the annular groove at the end of the corresponding hinge shaft. The second pin hole on the lower side corresponds to the first pin hole on the limiting ear plate in the corresponding square notch on the left and right and is connected through the pin shaft. The cotter pin is installed at the end of the pin shaft to lock the pin shaft.

4. The front beam articulated shaft limiting device for a hydraulic support for coal mines according to claim 3 is characterized in that: The upper side of the limiting plate is provided with an arc-shaped notch matched with the circumference of the annular groove.

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