Bottom lifting device for coal mine hydraulic support

Abstract

The utility model discloses a coal mine hydraulic support bottom lifting device which comprises a hydraulic support, a bottom lifting oil cylinder, a rotating piece and a pushing rod. The hydraulic support comprises a base. The bottom lifting oil cylinder comprises a fixed part and a telescopic part, the fixed part is connected with the base, and the telescopic part is telescopic relative to the fixed part in the height direction of the hydraulic support; the rotating piece is rotatably arranged at the bottom end of the telescopic part; the pushing rod is connected with a base of the hydraulic support and extends in the front-back direction of the hydraulic support, the pushing rod is located below the rotating piece, and the rotating piece abuts against the pushing rod. According to the bottom lifting device of the coal mine hydraulic support, due to the fact that the rotating piece is adopted to replace an original hemispherical head, the friction mode of the bottom lifting oil cylinder in the moving process is changed from sliding friction to rolling friction, abrasion is greatly reduced, and therefore the service life of the bottom lifting oil cylinder is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic supports, in particular to a bottom lifting device for a coal mine hydraulic support. Background Art

[0002] The hydraulic support is a supporting equipment for the comprehensive mining working face of a coal mine. It uses hydraulic power to realize movements such as lifting, moving forward, etc. It can reliably and effectively support and control the roof of the working face, isolate the goaf, prevent gangue from entering the mining working face and push the conveyor. It is used in conjunction with a coal mining machine to realize comprehensive mechanization of coal mining, improve and enhance the efficiency of coal mining and transportation equipment, and maintain the safety of the working space. In order to facilitate the pushing, sliding and pulling of the hydraulic support frame, it is necessary to install a bottom lifting mechanism at the bottom end of the hydraulic support frame to realize the lifting of the hydraulic support frame. The bottom lifting cylinder is the power output component of the bottom lifting mechanism. However, the head of the bottom lifting cylinder in the related art is hemispherical, and is subjected to sliding friction during contact. The ball head is severely worn, resulting in a short service life. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present utility model provides a coal mine hydraulic support bottom lifting device.

[0005] The coal mine hydraulic support bottom lifting device of the present invention comprises a hydraulic support, a bottom lifting cylinder, a rotating member, and a push rod. The hydraulic support comprises a base; the bottom lifting cylinder comprises a fixed portion and a telescopic portion, the fixed portion being connected to the base, the telescopic portion being telescopic relative to the fixed portion in the height direction of the hydraulic support; the rotating member being rotatably disposed at the bottom end of the telescopic portion; the push rod being connected to the base of the hydraulic support and extending in the front-to-back direction of the hydraulic support; the push rod being located below the rotating member, and the rotating member abutting against the pushing rod.

[0006] In some embodiments, the push rod includes a guide rail extending along the length direction of the hydraulic support, and the rotating member abuts against the guide rail.

[0007] In some embodiments, the rotating member is a rotating wheel, the guide rail is a flat plate, and the outer peripheral surface of the rotating wheel abuts against the top surface of the flat plate.

[0008] In some embodiments, the rotating member is a gear, the guide rail is a rack, and the gear is meshed with the rack.

[0009] In some embodiments, the coal mine hydraulic support bottom lifting device of the embodiment of the utility model also includes a first plate, a second plate and a third plate. The first plate is arranged perpendicular to the axis of the bottom lifting cylinder and is connected to the bottom end of the telescopic part. The second plate and the third plate are arranged at both ends of the first plate at intervals along the width direction of the hydraulic support. The rotating part is rotatably arranged between the second plate and the third plate through a pin shaft.

[0010] In some embodiments, the rotating member is provided with a first limit plate and a second limit plate on both sides of the width direction of the hydraulic support. The first limit plate and the second limit plate are located on both sides of the guide rail. The first limit plate and the second limit plate are used to limit the rotating member in the width direction of the hydraulic support.

[0011] In some embodiments, the push rod has a groove opening upward, the groove extends along the length direction of the hydraulic support, and the guide rail is located in the groove.

[0012] When the coal mine hydraulic support bottom lifting device of the embodiment of the utility model is in operation, when the hydraulic support is in the working position, the telescopic part of the bottom lifting cylinder is in a retracted state, and the base of the hydraulic support is placed stably on the working surface. When it is necessary to lift the hydraulic support for pushing or pulling operations, the control system will supply oil to the bottom lifting cylinder to cause the telescopic part to begin to extend. As the telescopic part of the bottom lifting cylinder extends, the hydraulic support is lifted smoothly. When the hydraulic support is lifted, the push rod can push or pull the hydraulic support forward or backward through the connection with the base to meet the needs of coal mining. After the pushing operation is completed, the hydraulic system controls the bottom lifting cylinder again to retract it, and the telescopic part returns to its initial state, and the hydraulic support is also lowered back to the working position.

[0013] Since a rotating part is used instead of the original hemispherical head, the friction mode of the bottom lifting cylinder during movement changes from sliding friction to rolling friction, which greatly reduces wear and tear, thereby extending the service life of the bottom lifting cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a coal mine hydraulic support bottom lifting device according to an embodiment of the utility model.

[0015] Figure 2 It is a schematic diagram of the installation of the bottom lifting cylinder and the push rod according to an embodiment of the utility model.

[0016] Figure 3 yes Figure 2 Enlarged schematic diagram of part A.

[0017] Figure 4 It is a cross-sectional view of the installation of the bottom lifting cylinder and the push rod according to an embodiment of the utility model.

[0018] Figure 5 It is a longitudinal sectional view of the installation of the bottom lifting cylinder and the push rod according to an embodiment of the utility model.

[0019] Reference numerals:

[0020] 100. Coal mine hydraulic support bottom lifting device; 1. Hydraulic support; 101. Base; 2. Bottom lifting cylinder; 201. Fixed part; 202. Telescopic part; 3. Rotating part; 4. Push rod; 401. Guide rail; 402. Groove; 5. First plate; 6. Second plate; 7. Third plate; 8. First limit plate; 9. Second limit plate. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0022] like Figures 1 to 5 As shown, the coal mine hydraulic support bottom lifting device 100 of the present invention includes a hydraulic support 1, a bottom lifting cylinder 2, a rotating member 3, and a push rod 4. The hydraulic support 1 includes a base 101. The bottom lifting cylinder 2 includes a fixed portion 201 and a telescopic portion 202. The fixed portion 201 is connected to the base 101, and the telescopic portion 202 is telescopic relative to the fixed portion 201 in the height direction of the hydraulic support 1. The rotating member 3 is rotatably disposed at the bottom end of the telescopic portion 202. The push rod 4 is connected to the base 101 of the hydraulic support 1 and extends in the front-to-back direction of the hydraulic support 1. The push rod 4 is located below the rotating member 3, and the rotating member 3 abuts against the push rod 4.

[0023] When the coal mine hydraulic support bottom lifting device 100 of the embodiment of the utility model is working, when the hydraulic support 1 is in the working position, the telescopic part 202 of the bottom lifting cylinder 2 is in a retracted state, and the base 101 of the hydraulic support 1 is placed stably on the working surface. When it is necessary to lift the hydraulic support 1 for pushing or pulling operations, the control system will supply oil to the bottom lifting cylinder 2, so that the telescopic part 202 begins to extend. As the telescopic part 202 of the bottom lifting cylinder 2 extends, the hydraulic support 1 is lifted smoothly. When the hydraulic support 1 is lifted, the push rod 4 can push or pull the hydraulic support 1 forward or backward through the connection with the base 101 to meet the needs of coal mining. After the pushing operation is completed, the hydraulic system controls the bottom lifting cylinder 2 again to retract it, and the telescopic part 202 returns to its initial state, and the hydraulic support 1 is also lowered back to the working position.

[0024] Since the rotating part 3 is used to replace the original hemispherical head, the friction mode of the bottom lifting cylinder 2 during movement is changed from sliding friction to rolling friction, which greatly reduces wear and tear, thereby extending the service life of the bottom lifting cylinder 2.

[0025] In some embodiments, the push rod 4 includes a guide rail 401 extending along the length direction of the hydraulic support 1 , and the rotating member 3 abuts against the guide rail 401 .

[0026] The presence of the guide rail 401 provides a stable sliding path for the rotating member 3, reducing shaking and jumping during the movement, thereby improving overall stability. The guide rail 401 ensures the linear motion of the rotating member 3, preventing the hydraulic support 1 from shifting and deflecting during the movement, and improving the movement accuracy.

[0027] Optionally, the rotating member 3 is a rotating wheel, the guide rail 401 is a flat plate, and the outer peripheral surface of the rotating wheel abuts against the top surface of the flat plate.

[0028] Optionally, the rotating member 3 is a gear, the guide rail 401 is a rack, and the gear is meshed with the rack.

[0029] In some embodiments, the coal mine hydraulic support bottom lifting device 100 of the present utility model embodiment further includes a first plate 5, a second plate 6, and a third plate 7. The first plate 5 is arranged perpendicular to the axis of the bottom lifting cylinder 2 and connected to the bottom end of the telescopic portion 202. The second plate 6 and the third plate 7 are arranged at opposite ends of the first plate 5 along the width direction of the hydraulic support 1. The rotating member 3 is rotatably arranged between the second plate 6 and the third plate 7 via a pin.

[0030] The arrangement of the first plate 5, the second plate 6 and the third plate 7 provides a sturdy frame, which enhances the stability of the bottom lifting device and makes the hydraulic support 1 more stable during the pushing process. The space between the second plate 6 and the third plate 7 limits the movement trajectory of the rotating part 3, ensuring that it moves along a predetermined straight path, thereby improving the accuracy of the pushing. The design of the rotating part 3 and the pin reduces unnecessary swinging and interference during movement, making the entire bottom lifting and pushing process smoother. The rolling contact between the rotating part 3 and the guide rail 401 reduces friction, thereby increasing the service life of the rotating part 3 and the guide rail 401. The connection design between the components makes maintenance work more convenient, such as replacing worn rotating parts 3 or pins.

[0031] In some embodiments, the rotating member 3 is provided with a first limit plate 8 and a second limit plate 9 on both sides of the width direction of the hydraulic support 1. The first limit plate 8 and the second limit plate 9 are located on both sides of the guide rail 401. The first limit plate 8 and the second limit plate 9 are used to limit the rotating member 3 in the width direction of the hydraulic support 1.

[0032] When the hydraulic support 1 needs to be lifted or pushed, the bottom lifting cylinder 2 pushes the rotating part 3 to roll along the guide rail 401. During this process, the first limit plate 8 and the second limit plate 9 limit the lateral movement of the rotating part 3, ensuring that it only rolls on the straight path on the guide rail 401. As the rotating part 3 moves, when it contacts the limit plate, the limit plate prevents the rotating part 3 from moving further, thereby preventing the rotating part 3 from exceeding the predetermined range of motion. The use of the limit plate ensures that the rotating part 3 always moves within the control range, reduces possible unexpected situations during the pushing process, and improves work safety. The limit plate provides a clear movement limit for the rotating part 3, enhances the guidance of the entire bottom lifting device, and makes the pushing operation more accurate. Since the movement of the rotating part 3 is limited to the predetermined path, the contact and friction with the parts outside the guide rail 401 are reduced, thereby reducing unnecessary wear.

[0033] In some embodiments, the push rod 4 has an upwardly opening groove 402, which extends along the length of the hydraulic support 1, and the guide rail 401 is located in the groove 402. The provision of the groove 402 can protect the rotating member 3 from being hit by objects, which is conducive to improving working reliability.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0035] Furthermore, 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0036] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0038] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0039] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A coal mine hydraulic support bottom lifting device, characterized in that: include: A hydraulic support (1), the hydraulic support (1) comprising a base (101); A bottom-lifting oil cylinder (2), the bottom-lifting oil cylinder (2) comprising a fixed portion (201) and a telescopic portion (202), the fixed portion (201) being connected to the base (101), and the telescopic portion (202) being telescopic relative to the fixed portion (201) in a height direction of the hydraulic support (1); a rotating member (3), the rotating member (3) being rotatably disposed at the bottom end of the telescopic portion (202); A push rod (4), the push rod (4) is connected to the base (101) of the hydraulic support (1) and extends along the front-rear direction of the hydraulic support (1), the push rod (4) is located below the rotating member (3), and the rotating member (3) abuts against the push rod (4).

2. The coal mine hydraulic support bottom lifting device according to claim 1, characterized in that: The push rod (4) comprises a guide rail (401) extending along the length direction of the hydraulic support (1), and the rotating member (3) abuts against the guide rail (401).

3. The coal mine hydraulic support bottom lifting device according to claim 2, characterized in that: The rotating member (3) is a rotating wheel, the guide rail (401) is a flat plate, and the outer peripheral surface of the rotating wheel abuts against the top end surface of the flat plate.

4. The coal mine hydraulic support bottom lifting device according to claim 2, characterized in that: The rotating member (3) is a gear, the guide rail (401) is a rack, and the gear is meshed with the rack.

5. The coal mine hydraulic support bottom lifting device according to claim 2, characterized in that: It also includes a first plate (5), a second plate (6) and a third plate (7), wherein the first plate (5) is arranged perpendicular to the axis of the bottom lifting cylinder (2) and is connected to the bottom end of the telescopic part (202), the second plate (6) and the third plate (7) are arranged at intervals at both ends of the first plate (5) along the width direction of the hydraulic support (1), and the rotating member (3) is rotatably arranged between the second plate (6) and the third plate (7) through a pin shaft.

6. The coal mine hydraulic support bottom lifting device according to claim 2, characterized in that: The rotating member (3) is provided with a first limiting plate (8) and a second limiting plate (9) on both sides of the width direction of the hydraulic support (1); the first limiting plate (8) and the second limiting plate (9) are located on both sides of the guide rail (401); the first limiting plate (8) and the second limiting plate (9) are used to limit the rotating member (3) in the width direction of the hydraulic support (1).

7. The coal mine hydraulic support bottom lifting device according to claim 2, characterized in that: The push rod (4) has a groove (402) opening upward, the groove (402) extends along the length direction of the hydraulic support (1), and the guide rail (401) is located in the groove (402).

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