Bottom lifting mechanism and hydraulic support

Abstract

The invention provides a bottom lifting mechanism and a hydraulic support. The bottom lifting mechanism comprises a bottom lifting base; the connecting shaft is rotatably installed on the bottom lifting base, the bottom lifting jack is fixedly connected with the connecting shaft, and the bottom lifting jack can rotate around the connecting shaft relative to the bottom lifting base; the first limiting piece is connected with the bottom lifting jack; and the second limiting piece is connected with the bottom lifting base, and the second limiting piece is matched with the first limiting piece to limit the bottom lifting jack. By arranging the connecting shaft, the whole bottom-lifting jack obtains the degree of freedom of rotating around the shaft, the stress mode of the bottom-lifting jack is changed, the bending moment borne by the bottom-lifting jack is transmitted to the second limiting piece from the first limiting piece, and therefore the bottom-lifting jack is not stressed, transverse torque generated to the bottom-lifting jack when the push rod is retracted can be prevented, and the service life of the bottom-lifting jack is prolonged. Therefore, the bottom lifting jack is bent.

Description

Technical Field

[0001] This application relates to the field of hydraulic support technology, and more specifically, to a bottom-lifting mechanism and a hydraulic support. Background Technology

[0002] Hydraulic supports are used in fully mechanized mining faces to support the roof, maintain safe working space, and move mining and transportation equipment. In conditions where the floor is soft or expands when exposed to water, hydraulic supports must be equipped with a lifting mechanism for easy movement. Due to structural limitations, thin coal seam supports often have a lifting jack with the cylinder at the top and the piston rod pointing downwards. During movement (pushing the support), fluid is supplied via a control valve, causing the piston rod to extend and contact the push rod. Supporting the push rod, the front end of the base lifts, at which point the push jack moves, causing the push rod to retract, completing the movement. Because of this structural limitation, the upper part of the lifting jack is fixed and lacks freedom of movement. During movement, the piston rod is subjected not only to friction with the push rod but also to a lateral torque generated by the retraction of the push rod, perpendicular to the piston rod's axis. This easily causes the piston rod to bend and deform, leading to cylinder seal leakage, damage to the lifting jack, and inoperability, making movement difficult.

[0003] Therefore, how to prevent the lifting jack from being damaged during the frame relocation has become an urgent problem to be solved. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art or related technologies.

[0005] Therefore, the first aspect of this application provides a lifting mechanism.

[0006] A second aspect of this application provides a hydraulic support.

[0007] In view of the above, the first aspect of this application proposes a lifting mechanism, comprising: a lifting base; a connecting shaft rotatably mounted on the lifting base; a lifting jack fixedly connected to the connecting shaft, the lifting jack being rotatable relative to the lifting base around the connecting shaft; a first limiting member connected to the lifting jack; and a second limiting member connected to the lifting base, the second limiting member cooperating with the first limiting member to limit the lifting jack.

[0008] The lifting mechanism proposed in this application mainly consists of a lifting base, a connecting shaft, a lifting jack, and two limiting members. The connecting shaft is rotatably mounted on the lifting base, for example, through bearings or simple shaft-hole fittings to achieve rotational support. The lifting jack, typically a hydraulic cylinder, has its cylinder body fixedly connected to the connecting shaft, for example, by welding or fasteners, allowing the entire lifting jack to swing or rotate relative to the lifting base around the connecting shaft as its rotation center. The first limiting member is fixed to the lifting jack and moves with the jack's swing. The second limiting member is fixed to the lifting base, and its position is preset so that when the lifting jack rotates to a certain expected angle or position, the moving first limiting member will contact, abut, or engage with the stationary second limiting member. This engagement creates mechanical interference, preventing the lifting jack from continuing to rotate in its original direction, thereby limiting its swing angle to a preset safe or working range and preventing excessive rotation that could cause structural damage or loss of control. By setting a connecting shaft, the lifting jack as a whole gains the freedom to rotate around the shaft, which changes the way the lifting jack is subjected to force. The bending moment on the lifting jack is transmitted from the first limiting member to the second limiting member. Therefore, the lifting jack is not subjected to force, which can prevent the lateral moment generated on the lifting jack when the push rod is retracted, which would cause the lifting jack to bend.

[0009] In any of the above technical solutions, optionally, the bottom-lifting jack includes: a piston rod; a cylinder body, the piston rod being disposed within the cylinder body, and the piston rod and the cylinder body being able to slide relative to each other; a first limiting member being disposed on the piston rod; and a connecting shaft being disposed on the cylinder body.

[0010] In these technical solutions, the lifting jack includes a hollow cylinder and a piston rod extending into it. The piston rod can reciprocate linearly relative to the cylinder under hydraulic drive. A first limiting member is directly mounted on the piston rod. Simultaneously, a connecting shaft is set and fixed to the cylinder. This arrangement means that regardless of whether the piston rod is extended or retracted, as long as the entire jack swings around the connecting shaft, the first limiting member on the piston rod will move accordingly and interact with a second limiting member on the base to achieve limiting. This provides a direct and compact limiting solution.

[0011] Optionally, in any of the above technical solutions, the lifting base also includes two side plates, and a connecting shaft is disposed between the two side plates, the connecting shaft being rotatably mounted on the two side plates.

[0012] In these technical solutions, the lifting base is not a simple flat plate; it also includes two basically parallel, oppositely arranged side plates that extend upwards from the main body of the base, forming a U-shaped or frame-like structure. The connecting shaft is horizontally mounted between these two side plates, with its two ends rotatably installed on them via shaft holes or other means. This double-support structure provides stable and reliable rotational support for the connecting shaft and the lifting jack fixed to it, ensuring smooth swinging and the ability to withstand large torques.

[0013] In any of the above technical solutions, optionally, the lifting base also includes two ear plates, which are respectively disposed on two side plates. The ear plates are provided with first through holes, and the two ends of the connecting shaft are respectively disposed in the two first through holes, so as to realize the rotatable connection between the connecting shaft and the ear plates.

[0014] In these technical solutions, each side plate is equipped with an ear plate. The ear plate can be a protruding lug from the side plate or a separately machined component fixed to the side plate. Each ear plate has a first through hole. The two ends of the connecting shaft are no longer directly installed in the holes of the side plates, but instead pass through the first through holes of the two ear plates respectively, thereby achieving a rotatable connection with the ear plates and, consequently, with the entire lifting base. This ear plate structure can locally reinforce the parts subjected to rotational friction and stress, facilitates processing and maintenance, and also provides more flexible design space.

[0015] In any of the above technical solutions, optionally, the connecting shaft includes two shaft parts and a connecting part, the two shaft parts are disposed on both sides of the connecting part, the connecting part is fixedly connected to the bottom lifting jack, and the two shaft parts are respectively disposed in the first through hole.

[0016] In these technical solutions, the connecting shaft consists of a central connecting section and two end shaft sections. The two end shaft sections can be understood as journals. The connecting section is used for fixed connection with the cylinder body of the lifting jack. The two end shaft sections are respectively inserted into and supported in the first through holes of the two lug plates. The central connecting section is specially designed according to the jack's mounting interface (e.g., adding connecting surfaces and bolt holes), while the end shaft sections focus on providing standard rotary support functions, improving the modularity and manufacturability of the design.

[0017] Optionally, in any of the above technical solutions, the connecting part is connected to the lifting jack by bolts.

[0018] In these technical solutions, the connecting part is fixed to the cylinder body of the lifting jack by bolts. For example, bolt holes can be provided on the connecting part, and corresponding through holes can be provided on the cylinder body of the jack, and then bolts can be passed through and tightened; or a clamp-type connecting block can be used, and bolts can be used to lock the clamp onto the cylinder body, making the installation and disassembly of the connecting part and the lifting jack convenient, the connection reliable, and facilitating on-site maintenance and component replacement.

[0019] In any of the above technical solutions, optionally, the lifting mechanism further includes: a push rod, which is located on the center line of the lifting base along the length direction, and one end of the push rod extends out of the lifting base; and a piston rod including an arc structure, which is located at the end of the piston rod and contacts the push rod.

[0020] In these technical solutions, the piston rod has an arc-shaped structure at its end, and the push rod is positioned along the centerline of the lifting base along its length, with one end extending out of the base for being pushed. The arc-shaped structure contacts the side or bottom surface of the push rod. This contact between the arc-shaped surface and the push rod facilitates force transmission, reduces stress concentration, and allows for effective contact and pushing even with a certain angular deviation, thus improving the mechanism's operational tolerance and reliability.

[0021] In any of the above technical solutions, optionally, the lifting mechanism further includes a pin; the piston rod also includes a first pin hole, the first pin hole is located at one end of the piston rod near the arc structure, and the extension direction of the first pin hole extends through the piston rod; the first limiting member includes a second pin hole, and the pin passes through the first pin hole and the second pin hole to fix the first limiting member on the piston rod.

[0022] In these technical solutions, a first pin hole is machined on the piston rod near its end with the arcuate structure, along a radial direction perpendicular to the piston rod axis, and the first pin hole penetrates the piston rod body. Correspondingly, a second pin hole is also machined on the first limiting member. During installation, the first limiting member is aligned so that the second pin hole aligns with the first pin hole on the piston rod, and then a pin is inserted and passes through these two aligned holes. In this way, the pin securely locks the first limiting member onto the piston rod, preventing it from falling off or rotating.

[0023] Optionally, in any of the above technical solutions, the number of second limiting members is two, the two second limiting members are disposed opposite to each other on the side plate, each second limiting member includes two limiting plates disposed at intervals, and the first limiting member is disposed between the two limiting plates.

[0024] In these technical solutions, there are two second limiting members, which are arranged opposite each other on the side plate. Each second limiting member includes two limiting plates spaced at a certain interval. When the first limiting member is static (i.e., when the jack is in a non-limit swing position), its position or trajectory lies within the space or gap formed between the two limiting plates. When the lifting jack swings in one direction, the first limiting member approaches and eventually abuts against the limiting plate in one direction; when swinging in the opposite direction, it abuts against the limiting plate in the other direction. This arrangement enables bidirectional limiting in both swing directions, confining the jack's swing range between two fixed mechanical stops, providing precise and reliable angle control.

[0025] A second aspect of the present invention provides a hydraulic support, comprising: a bottom-lifting mechanism as described in any of the above technical solutions.

[0026] In this technical solution, since the hydraulic support includes the bottom-lifting mechanism in any of the above technical solutions, the hydraulic support has all the beneficial effects of the bottom-lifting mechanism in any of the above technical solutions.

[0027] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 This illustration shows one of the structural schematic diagrams of the bottom-lifting mechanism in one embodiment of this application;

[0030] Figure 2 This is a second schematic diagram of the lifting mechanism in one embodiment of this application;

[0031] Figure 3 The third schematic diagram of the lifting mechanism in one embodiment of this application is shown;

[0032] Figure 4 This illustration shows one of the structural schematic diagrams of the lifting jack and connecting shaft in one embodiment of this application;

[0033] Figure 5 This is a second schematic diagram of the structure of the lifting jack and connecting shaft in one embodiment of this application;

[0034] Figure 6 A schematic diagram of the structure of the first limiting member in one embodiment of this application is shown;

[0035] Figure 7 This is one of the structural schematic diagrams of the lifting jack, connecting shaft and first limiting member in one embodiment of this application;

[0036] Figure 8 This is a second schematic diagram showing the structure of the lifting jack, connecting shaft and first limiting member in one embodiment of this application;

[0037] Figure 9 This illustration shows one of the structural schematic diagrams of the lifting base in one embodiment of this application;

[0038] Figure 10 The second schematic diagram shows the structure of the lifting base in one embodiment of this application.

[0039] The components include: 1 lifting mechanism, 10 lifting base, 101 side plate, 102 ear plate, 103 first through hole, 12 connecting shaft, 121 shaft part, 122 connecting part, 13 lifting jack, 131 piston rod, 132 cylinder body, 133 arc structure, 134 first pin hole, 14 first limiting piece, 141 second pin hole, 15 second limiting piece, 151 limiting plate, 16 push rod, and 17 pin shaft. Detailed Implementation

[0040] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0042] The following is combined with, for example Figures 1 to 10 To further illustrate a lifting mechanism 1 in this embodiment, the mechanism includes: a lifting base 10; a connecting shaft 12 rotatably mounted on the lifting base 10; a lifting jack 13 fixedly connected to the connecting shaft 12, the lifting jack 13 being able to rotate relative to the lifting base 10 around the connecting shaft 12; a first limiting member 14 connected to the lifting jack 13; and a second limiting member 15 connected to the lifting base 10, the second limiting member 15 cooperating with the first limiting member 14 to limit the lifting jack 13.

[0043] like Figure 1 , Figure 2 and Figure 10As shown, the lifting mechanism 1 proposed in this application mainly consists of a lifting base 10, a connecting shaft 12, a lifting jack 13, and two limiting members. The connecting shaft 12 is rotatably mounted on the lifting base 10, for example, through a bearing or a simple shaft hole fit to achieve rotational support. The lifting jack 13 is typically a hydraulic cylinder, with its cylinder body 132 fixedly connected to the connecting shaft 12, for example, by welding or locking with fasteners, allowing the entire lifting jack 13 to swing or rotate relative to the lifting base 10 with the connecting shaft 12 as its rotation center. The first limiting member 14 is fixed to the lifting jack 13 and moves with the swing of the jack. The second limiting member 15 is fixed to the lifting base 10, and its position is set so that when the lifting jack 13 rotates to a certain expected angle or position, the moving first limiting member 14 will contact, abut, or engage with the stationary second limiting member 15. This interaction will cause mechanical interference, preventing the bottom lifting jack 13 from continuing to rotate in the original direction, thereby limiting its swing angle to a preset safe or working range and preventing excessive rotation from causing structural damage or loss of control.

[0044] In any of the above embodiments, optionally, as Figure 4 and Figure 5 As shown, the bottom lifting jack 13 includes: a piston rod 131; a cylinder 132, the piston rod 131 is disposed inside the cylinder 132, and the piston rod 131 and the cylinder 132 can slide relative to each other; a first limiting member 14 is disposed on the piston rod 131; and a connecting shaft 12 is disposed on the cylinder 132.

[0045] In these embodiments, the lifting jack 13 includes a hollow cylinder 132 and a piston rod 131 extending therein, which can reciprocate linearly relative to the cylinder 132 under hydraulic drive. A first limiting member 14 is directly mounted on the piston rod 131. Simultaneously, a connecting shaft 12 is set and fixed to the cylinder 132. This arrangement means that regardless of whether the piston rod 131 is extended or retracted, as long as the entire jack swings around the connecting shaft 12, the first limiting member 14 on the piston rod 131 will move accordingly and interact with the second limiting member 15 on the base to achieve limiting. This provides a direct and compact limiting solution.

[0046] In any of the above embodiments, optionally, as Figure 2 , Figure 9 and Figure 10 As shown, the lifting base 10 also includes two side plates 101, and a connecting shaft 12 is disposed between the two side plates 101. The connecting shaft 12 is rotatably mounted on the two side plates 101.

[0047] In these embodiments, the lifting base 10 is not a simple flat plate; it also includes two generally parallel, oppositely arranged side plates 101. These two side plates 101 extend upward from the base body, forming a U-shaped or frame-like structure. The connecting shaft 12 is horizontally mounted between these two side plates 101, and its two ends are rotatably mounted on these two side plates 101 through shaft hole fittings or other means. This double-support structure provides stable and reliable rotational support for the connecting shaft 12 and the lifting jack 13 fixed thereto, ensuring smooth swinging and withstanding large torques.

[0048] In any of the above embodiments, optionally, as Figure 2 , Figure 9 and Figure 10 As shown, the lifting base 10 also includes two ear plates 102, which are respectively disposed on two side plates 101. The ear plates 102 are provided with first through holes 103, and the two ends of the connecting shaft 12 are respectively disposed in the two first through holes 103, so as to realize the rotatable connection between the connecting shaft 12 and the ear plates 102.

[0049] In these embodiments, each side plate 101 is provided with an ear plate 102. The ear plate 102 can be a lug protruding from the side plate 101, or it can be a component that is separately machined and fixed to the side plate 101. Each ear plate 102 is machined with a first through hole 103. The two ends of the connecting shaft 12 are no longer directly installed in the holes of the side plate 101, but are respectively inserted into the first through holes 103 on the two ear plates 102, thereby realizing a rotatable connection with the ear plates 102, and then with the entire lifting base 10. This ear plate 102 structure can locally strengthen the parts that bear rotational friction and force, facilitate processing and maintenance, and also provide more flexible design space.

[0050] In any of the above embodiments, optionally, as Figure 2 , Figure 7 and Figure 8 As shown, the connecting shaft 12 includes two shaft portions 121 and a connecting portion 122. The two shaft portions 121 are disposed on both sides of the connecting portion 122. The connecting portion 122 is fixedly connected to the bottom lifting jack 13. The two shaft portions 121 are respectively disposed in the first through hole 103.

[0051] In these embodiments, the connecting shaft 12 consists of a central connecting portion 122 and two end shaft portions 121. The two shaft portions 121 can be understood as journals. The connecting portion 122 is used for fixed connection with the cylinder body 132 of the lifting jack 13. The two shaft portions 121 are respectively inserted into and supported in the first through holes 103 of the two lug plates 102. The central connecting portion 122 is specially designed according to the jack's mounting interface (e.g., adding a connecting surface, opening bolt holes), while the two end shaft portions 121 focus on providing standard rotary support functionality, improving the modularity and manufacturability of the design.

[0052] In any of the above embodiments, the connecting part 122 is optionally connected to the bottom lifting jack 13 by bolts.

[0053] In these embodiments, the connecting part 122 is fixed by being connected to the cylinder body 132 of the lifting jack 13 with bolts. For example, a screw hole can be provided on the connecting part 122 and a corresponding through hole can be provided on the jack cylinder body 132, and then bolts can be passed through and tightened; or a clamp-type connecting block can be used, and bolts can be used to lock the clamp onto the cylinder body 132, so that the connecting part 122 and the lifting jack 13 are easy to install and disassemble, the connection is reliable, and it is convenient for on-site maintenance and component replacement.

[0054] In any of the above embodiments, optionally, as Figure 1 , Figure 3 and Figure 4 As shown, the lifting mechanism 1 further includes: a push rod 16, which is located on the center line of the lifting base 10 along its length. Figure 1 On the dotted line (which is the center line), one end of the push rod 16 extends out of the lifting base 10; the piston rod 131 includes an arc structure 133, which is located at the end of the piston rod 131 and contacts the push rod 16.

[0055] In these embodiments, the piston rod 131 has an arcuate structure 133 at its end, and the push rod 16 is positioned along the centerline of the lifting base 10 along its length, with one end extending out of the base for being pushed. The arcuate structure 133 contacts the side or bottom surface of the push rod 16. The contact between the arcuate surface and the push rod 16 facilitates force transmission, reduces stress concentration, and allows for effective contact and pushing even with a certain angular deviation, thus improving the mechanism's operational tolerance and reliability.

[0056] In any of the above embodiments, optionally, as Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, the lifting mechanism 1 also includes a pin 17; the piston rod 131 also includes a first pin hole 134, which is located at one end of the piston rod 131 near the arc structure 133, and the extension direction of the first pin hole 134 extends through the piston rod 131; the first limiting member 14 includes a second pin hole 141, and the pin 17 passes through the first pin hole 134 and the second pin hole 141 to fix the first limiting member 14 on the piston rod 131.

[0057] In these embodiments, a first pin hole 134 is machined on the piston rod 131 near its end with the arcuate structure 133, along a radial direction perpendicular to the axis of the piston rod 131, and the first pin hole 134 penetrates the rod body of the piston rod 131. Correspondingly, a second pin hole 141 is also machined on the first limiting member 14. During installation, the first limiting member 14 is aligned so that the second pin hole 141 is aligned with the first pin hole 134 on the piston rod 131, and then the pin 17 is inserted and passes through the two aligned holes. In this way, the pin 17 securely locks the first limiting member 14 onto the piston rod 131, preventing it from falling off or rotating.

[0058] In any of the above embodiments, optionally, the number of second limiting members 15 is two, and the two second limiting members 15 are disposed opposite to each other on the side plate 101. Each second limiting member 15 includes two limiting plates 151 disposed at intervals, and the first limiting member 14 is disposed between the two limiting plates 151.

[0059] In these embodiments, there are two second limiting members 15, which are disposed opposite to each other on the side plate, and each second limiting member 15 includes two limiting plates 151 arranged at a certain interval. When the first limiting member 14 is static (i.e., when the jack is in a non-limit swing position), its position or trajectory lies within the space or gap formed between the two limiting plates 151. When the lifting jack 13 swings in one direction, the first limiting member 14 approaches and eventually abuts against the limiting plate 151 in one direction; when swinging in the opposite direction, it abuts against the limiting plate 151 in the other direction. This arrangement enables bidirectional limiting in both swing directions, constraining the jack's swing range between two fixed mechanical stops, providing precise and reliable angle control.

[0060] A second aspect of the present invention provides a hydraulic support, comprising: a bottom-lifting mechanism 1 as described in any of the above embodiments.

[0061] In this embodiment, since the hydraulic support includes the bottom-lifting mechanism 1 in any of the above embodiments, the hydraulic support has all the beneficial effects of the bottom-lifting mechanism 1 in any of the above embodiments.

[0062] The force distribution of the bottom lifting jack 13 has been changed. The upper part of the bottom lifting jack 13 has a rotational degree of freedom and can rotate through the trunnion (connecting shaft 12), which is one more degree of freedom than the original structure.

[0063] When the frame is moved, the upper part rotates through the trunnion, and the lower part lifting shoe cover comes into contact with the base fixing plate (second limiting member 15) as it rotates, transferring the lateral force on the jack to the base fixing plate. The lifting jack 13 is only subjected to friction, and the lifting jack 13 is not easily damaged.

[0064] A detachable lifting shoe cover (first limiting member 14) is provided at the column head. The column head and the lifting shoe cover fit tightly together, the fixing pin 17 is not under force, and the push rod 16 contacts the shoe cover when the bracket moves, protecting the column head of the lifting jack 13 from wear and increasing the service life of the jack.

[0065] Once the shoe covers have worn out to the end of their lifespan, they can be replaced directly, reducing the maintenance costs associated with replacing the jack.

[0066] In this application, the term "multiple" refers to two or more unless otherwise expressly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0067] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. 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.

[0068] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A bottom-lifting mechanism, characterized in that, include: Lift base; The connecting shaft is rotatably mounted on the lifting base; A bottom-lifting jack is fixedly connected to the connecting shaft, and the bottom-lifting jack can rotate relative to the bottom-lifting base around the connecting shaft; The first limiting component is connected to the lifting jack. The second limiting member is connected to the lifting base, and the second limiting member cooperates with the first limiting member to limit the lifting jack.

2. The bottom-lifting mechanism according to claim 1, characterized in that, The lifting jack includes: a piston rod; The cylinder body, wherein the piston rod is disposed within the cylinder body, and the piston rod and the cylinder body are capable of sliding relative to each other; The first limiting member is disposed on the piston rod; The connecting shaft is mounted on the cylinder block.

3. The bottom-lifting mechanism according to claim 2, characterized in that, The lifting base also includes two side plates, and the connecting shaft is disposed between the two side plates and is rotatably mounted on the two side plates.

4. The bottom-lifting mechanism according to claim 3, characterized in that, The lifting base also includes two ear plates, which are respectively disposed on the two side plates. Each ear plate has a first through hole, and both ends of the connecting shaft are respectively disposed in the two first through holes to realize the rotatable connection between the connecting shaft and the ear plate.

5. The bottom-lifting mechanism according to claim 4, characterized in that, The connecting shaft includes two shaft portions and a connecting portion. The two shaft portions are disposed on both sides of the connecting portion. The connecting portion is fixedly connected to the bottom lifting jack. The two shaft portions are respectively disposed in the first through hole.

6. The bottom-lifting mechanism according to claim 5, characterized in that, The connecting part is connected to the lifting jack by bolts.

7. The lifting mechanism according to any one of claims 2 to 6, characterized in that, Also includes: A push rod, the push rod being located on the center line of the lifting base along the length direction, with one end of the push rod extending out of the lifting base; The piston rod includes an arc structure located at the end of the piston rod, and the arc structure is in contact with the push rod.

8. The bottom-lifting mechanism according to claim 7, characterized in that, It also includes pins; The piston rod also includes a first pin hole, which is located at one end of the piston rod near the arc structure, and the extension direction of the first pin hole extends through the piston rod. The first limiting member includes a second pin hole, and the pin passes through the first pin hole and the second pin hole to fix the first limiting member on the piston rod.

9. The bottom-lifting mechanism according to any one of claims 3 to 6, characterized in that, The number of the second limiting members is two, and the two second limiting members are disposed opposite to each other on the side plate. Each second limiting member includes two limiting plates that are spaced apart, and the first limiting member is disposed between the two limiting plates.

10. A hydraulic support, characterized in that, include: The lifting mechanism as described in any one of claims 1 to 9.

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