CN215781289U

CN215781289U - Leg pressing device for physical training

Info

Publication number: CN215781289U
Application number: CN202121107727.1U
Authority: CN
Inventors: 张亮
Original assignee: Weihai Vocational College
Current assignee: Weihai Vocational College
Priority date: 2021-05-17
Filing date: 2021-05-17
Publication date: 2022-02-11
Anticipated expiration: 2031-05-17

Abstract

The application discloses leg pressing ware that sports training used, including supporting the base, moving structure, protective structure and regulation structure, moving structure includes first hydraulic lift jar, support the base and seted up and accomodate the groove, accomodate the first hydraulic lift jar of groove top rigid coupling, the first backup pad of first hydraulic lift cylinder bottom rigid coupling, first backup pad bottom rigid coupling movable pulley. This application can be convenient for accomodate the movable pulley to accomodating the inslot through first hydraulic lifting cylinder and reinforcing plate isotructure, make leg pressing ware more stable when using, the position of sliding plate can be adjusted through electric putter and first mounting panel isotructure, the position of movable plate can be adjusted through screw thread post isotructure, be convenient for adjust according to training personnel's height, the height of rubber sponge post can be adjusted through second hydraulic lifting rod isotructure, the training person of different heights of not being convenient for carries out the leg pressing training.

Description

Leg pressing device for physical training

Technical Field

The application relates to a leg pressing device, in particular to a leg pressing device for physical training.

Background

Leg pressing is a warming and lacing wire, is a propeller for smooth movement and is also a protective cover for avoiding injury, leg pressing is the basic work of martial arts, leg pressing can protect skeletal muscles and effectively prevent injuries, leg pressing is the basis in several methods of leg pressing, and is also a method for a trainee to feel eating, before training, preparation activities of waist, crotch, knee, ankle joint and leg muscles can be performed, because the extensibility of muscles and ligaments is related to the temperature of the muscles, the warmth of the muscles can be improved, the viscosity inside the muscles can be reduced, the flexibility training of the legs can be facilitated, when the leg pressing is combined with various strength training subjects, such as running, bicycle riding, swimming, rowing and other projects, the flexibility can provide at least one third of necessary help in a complete body building training system, and the coordination of a nervous system and muscle tissues can be improved through the flexibility training, if the flexibility training is started immediately after a certain exercise is done, the tired body can be recovered as soon as possible.

At present the unstable condition of standing often appears when the exercise in the beginner, the body is like falling after, appears the shank ligament injury even, and passes through the leg pressing ware of similar horizontal bar and carry out leg pressing training more when sports training, is difficult to adjust the height of leg pressing ware, is not convenient for going on of leg pressing training. Therefore, a leg press for physical training is proposed to solve the above problems.

Disclosure of Invention

A leg pressing device for physical training comprises a supporting base, a moving structure, a protective structure and an adjusting structure;

the moving structure comprises a first hydraulic lifting cylinder, the supporting base is provided with an accommodating groove, the top of the accommodating groove is fixedly connected with the first hydraulic lifting cylinder, the bottom end of the first hydraulic lifting cylinder is fixedly connected with a first supporting plate, the bottom of the first supporting plate is fixedly connected with a sliding wheel, the first supporting plate is slidably connected to the surface of a fixed column, the bottom end of the fixed column is fixedly connected with a reinforcing plate, and the reinforcing plate is fixedly connected to the side wall of the accommodating groove;

the protective structure comprises a first mounting plate which is fixedly connected with the top of the supporting base, one side of the first mounting plate is fixedly connected with a limiting column, one end of the limiting column is fixedly connected with a second mounting plate, the second mounting plate is fixedly connected with the top of the supporting base, the surface of the limit column is connected with a sliding plate in a sliding way, one side of the sliding plate is fixedly connected with an electric push rod, the electric push rod is fixedly connected with one side of the first mounting plate, the top of the sliding plate is rotatably connected with a threaded column, the surface of the threaded column is in threaded connection with a movable plate, the movable plate is slidably connected with the surface of the positioning column, the top end of the positioning column is fixedly connected with a positioning plate, the movable plate is connected to the surface of a connecting column in a sliding manner, one end of the connecting column is fixedly connected with a first connecting plate, the other end of the connecting column is fixedly connected with a second connecting plate, one side of the second connecting plate is fixedly connected with a supporting spring, and the other side of the second connecting plate is rotatably connected with a massage ball;

the adjusting structure comprises a second hydraulic lifting rod, the second hydraulic lifting rod is fixedly connected to the top of the supporting base, the top end of the second hydraulic lifting rod is fixedly connected with a second supporting plate, the second supporting plate is rotatably connected to the surface of the center column, the surface of the center column is rotatably connected with a reinforcing column, the reinforcing column is fixedly connected to one side of the second supporting plate, the surface of the second supporting plate is in threaded connection with an adjusting column, and the surface of the center column is fixedly connected with the adjusting column.

Furthermore, the bottom of the first supporting plate is fixedly connected with four sliding wheels distributed in a rectangular structure, and the bottom of the supporting base is fixedly connected with four non-slip mats distributed in a rectangular structure.

Further, reinforcing plate top rigid coupling has four fixed columns that are the distribution of rectangle structure, four sliding opening that are the distribution of rectangle structure are seted up to first backup pad, fixed column top is run through sliding opening and rigid coupling in receiving groove top.

Furthermore, first mounting panel one side rigid coupling has two symmetric distribution's spacing post, and two the equal rigid coupling of spacing post one end has the second mounting panel, sliding plate sliding connection is in supporting the base top.

Furthermore, the top of the sliding plate is fixedly connected with two positioning columns which are symmetrically distributed, the moving plate is provided with two positioning holes which are symmetrically distributed, and the top ends of the positioning columns penetrate through the positioning holes and are fixedly connected to the bottom of the positioning plate.

Furthermore, the moving plate is provided with a threaded opening, and the top end of the threaded column penetrates through the threaded opening and is rotatably connected to the bottom of the positioning plate.

Furthermore, the movable plate is provided with a plurality of connecting ports, one side of the first connecting plate is fixedly connected with a plurality of connecting columns, and one ends of the connecting columns penetrate through the connecting ports and are fixedly connected to one side of the second connecting plate.

Furthermore, a plurality of evenly distributed supporting springs are fixedly connected to one side of the second connecting plate, the supporting springs are fixedly connected to one side of the moving plate, and a plurality of evenly distributed massage balls are rotatably connected to the other side of the second connecting plate.

Furthermore, the top of the supporting base is fixedly connected with two second hydraulic lifting rods which are symmetrically distributed, the top ends of the two second hydraulic lifting rods are fixedly connected with a second supporting plate, the second supporting plate and the reinforcing column are provided with rotating openings, and two ends of the central column penetrate through the rotating openings respectively and extend to one side of the second supporting plate.

Furthermore, the surfaces of two ends of the central column are provided with first external threads, the surface of the reinforcing column is provided with second external threads, the adjusting column is provided with a first thread groove and a second thread groove, the first thread groove is communicated with the second thread groove, the thread pitches of the first thread groove and the first external threads are the same, and the thread pitches of the second thread groove and the second external threads are the same.

The beneficial effect of this application is: the application provides a leg pressing ware that sports training used.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic overall perspective view of an embodiment of the present application;

FIG. 2 is a schematic diagram of the overall internal structure of an embodiment of the present application;

FIG. 3 is a schematic overall side view of an embodiment of the present application;

FIG. 4 is a schematic diagram of an overall top view of an embodiment of the present application;

FIG. 5 is a schematic top view of a movable plate according to an embodiment of the present application;

fig. 6 is an enlarged partial structural diagram of a portion a in fig. 4 according to an embodiment of the present application.

In the figure: 1. the supporting base, 2, first hydraulic lifting cylinder, 3, first backup pad, 4, the movable pulley, 5, the fixed column, 6, the reinforcing plate, 7, first mounting panel, 8, spacing post, 9, the second mounting panel, 10, the sliding plate, 11, electric putter, 12, the screw post, 13, the movable plate, 14, the reference column, 15, the locating plate, 16, the spliced pole, 17, first connecting plate, 18, the second connecting plate, 19, supporting spring, 20, the massage ball, 21, the second hydraulic lifting rod, 22, the second backup pad, 23, the center post, 24, the reinforcing post, 25, the regulation post, 26, the rubber sponge post.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1-6, a leg pressing device for physical training comprises a supporting base 1, a moving structure, a protection structure and an adjusting structure;

the moving structure comprises a first hydraulic lifting cylinder 2, the supporting base 1 is provided with a containing groove, the top of the containing groove is fixedly connected with the first hydraulic lifting cylinder 2, the bottom end of the first hydraulic lifting cylinder 2 is fixedly connected with a first supporting plate 3, the bottom of the first supporting plate 3 is fixedly connected with a sliding wheel 4, the first supporting plate 3 is slidably connected to the surface of a fixed column 5, the bottom end of the fixed column 5 is fixedly connected with a reinforcing plate 6, and the reinforcing plate 6 is fixedly connected to the side wall of the containing groove;

the protective structure comprises a first mounting plate 7, the first mounting plate 7 is fixedly connected to the top of a support base 1, one side of the first mounting plate 7 is fixedly connected with a limit column 8, one end of the limit column 8 is fixedly connected with a second mounting plate 9, the second mounting plate 9 is fixedly connected to the top of the support base 1, the surface of the limit column 8 is slidably connected with a sliding plate 10, one side of the sliding plate 10 is fixedly connected with an electric push rod 11, the electric push rod 11 is fixedly connected to one side of the first mounting plate 7, the top of the sliding plate 10 is rotatably connected with a threaded column 12, the surface of the threaded column 12 is in threaded connection with a movable plate 13, the movable plate 13 is slidably connected to the surface of a positioning column 14, the top end of the positioning column 14 is fixedly connected with a positioning plate 15, the movable plate 13 is slidably connected to the surface of a connecting column 16, one end of the connecting column 16 is fixedly connected with a first connecting plate 17, and the other end of the connecting column 16 is fixedly connected with a second connecting plate 18, one side of the second connecting plate 18 is fixedly connected with a supporting spring 19, and the other side of the second connecting plate 18 is rotatably connected with a massage ball 20;

the adjusting structure comprises a second hydraulic lifting rod 21, the second hydraulic lifting rod 21 is fixedly connected to the top of the supporting base 1, the top end of the second hydraulic lifting rod 21 is fixedly connected with a second supporting plate 22, the second supporting plate 22 is rotatably connected to the surface of a central column 23, the surface of the central column 23 is rotatably connected with a reinforcing column 24, the reinforcing column 24 is fixedly connected to one side of the second supporting plate 22, the surface of the second supporting plate 22 is in threaded connection with an adjusting column 25, and the surface of the central column 23 is fixedly connected with the adjusting column 25.

The bottom of the first supporting plate 3 is fixedly connected with four sliding wheels 4 distributed in a rectangular structure, and the bottom of the supporting base 1 is fixedly connected with four non-slip mats distributed in a rectangular structure; four fixed columns 5 distributed in a rectangular structure are fixedly connected to the top of the reinforcing plate 6, four sliding ports distributed in a rectangular structure are formed in the first supporting plate 3, and the top ends of the fixed columns 5 penetrate through the sliding ports and are fixedly connected to the top of the accommodating groove; two limiting columns 8 which are symmetrically distributed are fixedly connected to one side of the first mounting plate 7, a second mounting plate 9 is fixedly connected to one end of each of the two limiting columns 8, and the sliding plate 10 is slidably connected to the top of the support base 1; the top of the sliding plate 10 is fixedly connected with two positioning columns 14 which are symmetrically distributed, the moving plate 13 is provided with two positioning holes which are symmetrically distributed, and the top ends of the positioning columns 14 penetrate through the positioning holes and are fixedly connected to the bottom of the positioning plate 15; the moving plate 13 is provided with a threaded opening, and the top end of the threaded column 12 penetrates through the threaded opening and is rotatably connected to the bottom of the positioning plate 15; the movable plate 13 is provided with a plurality of connecting ports, one side of the first connecting plate 17 is fixedly connected with a plurality of connecting columns 16, and one end of each connecting column 16 penetrates through the connecting ports and is fixedly connected to one side of the second connecting plate 18; a plurality of uniformly distributed supporting springs 19 are fixedly connected to one side of the second connecting plate 18, the supporting springs 19 are fixedly connected to one side of the moving plate 13, and a plurality of uniformly distributed massage balls 20 are rotatably connected to the other side of the second connecting plate 18; two second hydraulic lifting rods 21 which are symmetrically distributed are fixedly connected to the top of the supporting base 1, a second supporting plate 22 is fixedly connected to the top ends of the two second hydraulic lifting rods 21, rotating openings are formed in the second supporting plate 22 and the reinforcing column 24, and two ends of the central column 23 penetrate through the rotating openings respectively and extend to one side of the second supporting plate 22; the surface of both ends of the central column 23 is provided with first external threads, the surface of the reinforcing column 24 is provided with second external threads, the adjusting column 25 is provided with a first thread groove and a second thread groove, the first thread groove is communicated with the second thread groove, the thread pitches of the first thread groove and the first external threads are the same, and the thread pitches of the second thread groove and the second external threads are the same.

When the leg pressing device is used, the electric appliance elements appearing in the application are externally connected with a power supply and a control switch when in use, the first hydraulic lifting cylinder 2 is started firstly, so that the first supporting plate 3 is driven to move downwards, the sliding wheel 4 is driven to move in the same direction, the sliding wheel 4 is contacted with the ground and lifts the supporting base 1 off the ground, meanwhile, the first supporting plate 3 can be limited through the fixing column 5 and the reinforcing plate 6, so that the sliding wheel 4 is more stable, then, the leg pressing device can be conveniently moved by utilizing the sliding wheel 4, then, the leg pressing device is moved to a specified area, then, the sliding wheel 4 is accommodated into the accommodating groove in an opposite mode, so that the supporting base 1 is utilized for supporting, meanwhile, the leg pressing device can be more stable when in use by matching with the anti-slip mat, the safety of the leg pressing device when in use is improved, then, the electric push rod 11 is started according to the height of a trainer, thereby driving the sliding plate 10 to move along the limiting column 8, thereby driving the threaded column 12 and the moving plate 13 to move in the same direction, thereby adjusting the distance between the rubber sponge column 26 and the moving plate 13 according to the height of the trainer, then rotating the threaded column 12, thereby driving the moving plate 13 to move along the positioning column 14, thereby driving the massage ball 20 to move in the same direction, thereby adjusting the moving plate 13 and the massage ball 20 to the back of the trainer, thereby protecting the trainer by using the moving plate 13 and the like, preventing the beginner from unstably standing and then falling down during leg pressing training, increasing the safety of the beginner when using the leg pressing device, simultaneously massaging the human body by using the structures of the massage ball 20 and the supporting spring 19, facilitating the back of the trainer to be massaged and relaxed, then starting the second hydraulic lifting rod 21 according to the height of the trainer, thereby adjust the height of second backup pad 22, thereby adjust the height of center post 23 and rubber sponge post 26 isotructure, when needs rubber sponge post 26 rotates, at first the initiative adjust the post 25, thereby adjust the post 25 and keep away from reinforcing post 24, can roll on rubber sponge post 26 when the trainer shank is placed on rubber sponge post 26 this moment, when not needing rubber sponge post 26 to roll, rotate and adjust post 25, thereby make and adjust post 25 threaded connection in reinforcing post 24 surface, thereby the position of injecing regulation post 25, thereby the position of injecing center post 23, thereby the position of injecing rubber sponge post 26, thereby prevent rubber sponge post 26 from rotating, thereby be convenient for select rubber sponge post 26 to rotate or not rotate according to the training needs, be convenient for the sports trainer to press the leg training.

The application has the advantages that:

1. the leg pressing device is simple in structure, the T can be convenient for the leg pressing device to move through the first supporting plate, the sliding wheel can be conveniently stored in the storage groove through the first hydraulic lifting cylinder, the reinforcing plate and the like, so that the leg pressing device is more stable in use and higher in safety in use;

2. the structure is reasonable, the position of the sliding plate can be adjusted through the structures such as the electric push rod and the first mounting plate, the position of the moving plate can be adjusted through the structures such as the threaded columns, the adjustment according to the height of a trainer is facilitated, meanwhile, a beginner can be protected, the phenomenon that the beginner leans back and falls down when standing unstably during exercise is prevented, the use of the trainer is facilitated, the back of a human body can be massaged and relaxed through the structures such as the massage ball and the support spring, and the use of the leg press is facilitated;

3. this application easy operation, can adjust the height of rubber sponge post through second hydraulic lifting rod and second backup pad isotructure, thereby adjust the rubber sponge post according to the training personnel of different heights and the training degree of difficulty, can inject the position of rubber sponge post through adjusting post and enhancement post isotructure, make the rubber sponge post can fix also can rotate, be convenient for according to the mode of different training needs strip second grade rubber sponge post, be convenient for go on of leg pressing training.

It is well within the skill of those in the art to implement, without undue experimentation, the present application is not directed to software and process improvements, as they relate to circuits and electronic components and modules.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The utility model provides a leg pressing ware that sports training used which characterized in that: comprises a supporting base (1), a moving structure, a protection structure and an adjusting structure;

the moving structure comprises a first hydraulic lifting cylinder (2), a containing groove is formed in the supporting base (1), the top of the containing groove is fixedly connected with the first hydraulic lifting cylinder (2), the bottom end of the first hydraulic lifting cylinder (2) is fixedly connected with a first supporting plate (3), the bottom of the first supporting plate (3) is fixedly connected with a sliding wheel (4), the first supporting plate (3) is slidably connected to the surface of a fixed column (5), the bottom end of the fixed column (5) is fixedly connected with a reinforcing plate (6), and the reinforcing plate (6) is fixedly connected to the side wall of the containing groove;

the protective structure comprises a first mounting plate (7), the first mounting plate (7) is fixedly connected to the top of a supporting base (1), one side of the first mounting plate (7) is fixedly connected with a limiting column (8), one end of the limiting column (8) is fixedly connected with a second mounting plate (9), the second mounting plate (9) is fixedly connected to the top of the supporting base (1), the limiting column (8) is connected with a sliding plate (10) in a surface sliding manner, one side of the sliding plate (10) is fixedly connected with an electric push rod (11), the electric push rod (11) is fixedly connected to one side of the first mounting plate (7), the top of the sliding plate (10) is rotatably connected with a threaded column (12), the threaded column (12) is connected with a movable plate (13) in a surface threaded manner, the movable plate (13) is slidably connected to the surface of a positioning column (14), the top end of the positioning column (14) is fixedly connected with a positioning plate (15), and the movable plate (13) is slidably connected to the surface of a connecting column (16), one end of the connecting column (16) is fixedly connected with a first connecting plate (17), the other end of the connecting column (16) is fixedly connected with a second connecting plate (18), one side of the second connecting plate (18) is fixedly connected with a supporting spring (19), and the other side of the second connecting plate (18) is rotatably connected with a massage ball (20);

the adjusting structure comprises a second hydraulic lifting rod (21), the second hydraulic lifting rod (21) is fixedly connected to the top of the supporting base (1), a second supporting plate (22) is fixedly connected to the top end of the second hydraulic lifting rod (21), the second supporting plate (22) is rotatably connected to the surface of the central column (23), the surface of the central column (23) is rotatably connected with a reinforcing column (24), the reinforcing column (24) is fixedly connected to one side of the second supporting plate (22), the surface of the second supporting plate (22) is in threaded connection with an adjusting column (25), and the surface of the central column (23) is fixedly connected with the adjusting column (25).

2. A leg press for physical training as claimed in claim 1, wherein: the bottom of the first supporting plate (3) is fixedly connected with four sliding wheels (4) which are distributed in a rectangular structure, and the bottom of the supporting base (1) is fixedly connected with four non-slip mats which are distributed in a rectangular structure.

3. A leg press for physical training as claimed in claim 1, wherein: reinforcing plate (6) top rigid coupling has four fixed columns (5) that are the distribution of rectangle structure, four slip mouths that are the distribution of rectangle structure are seted up in first backup pad (3), fixed column (5) top is run through slip mouth and rigid coupling in accomodating the groove top.

4. A leg press for physical training as claimed in claim 1, wherein: first mounting panel (7) one side rigid coupling has two symmetric distribution's spacing post (8), and two spacing post (8) one end equal rigid coupling has second mounting panel (9), sliding plate (10) sliding connection is in support base (1) top.

5. A leg press for physical training as claimed in claim 1, wherein: the top of the sliding plate (10) is fixedly connected with two positioning columns (14) which are symmetrically distributed, the moving plate (13) is provided with two positioning holes which are symmetrically distributed, and the top ends of the positioning columns (14) penetrate through the positioning holes and are fixedly connected to the bottom of the positioning plate (15).

6. A leg press for physical training as claimed in claim 1, wherein: the movable plate (13) is provided with a threaded opening, and the top end of the threaded column (12) penetrates through the threaded opening and is rotatably connected to the bottom of the positioning plate (15).

7. A leg press for physical training as claimed in claim 1, wherein: the movable plate (13) is provided with a plurality of connecting ports, one side of the first connecting plate (17) is fixedly connected with a plurality of connecting columns (16), and one end of each connecting column (16) penetrates through the connecting ports and is fixedly connected to one side of the second connecting plate (18).

8. A leg press for physical training as claimed in claim 1, wherein: second connecting plate (18) one side rigid coupling has a plurality of evenly distributed's supporting spring (19), just the equal rigid coupling in movable plate (13) one side of supporting spring (19), second connecting plate (18) opposite side rotates and is connected with a plurality of evenly distributed's massage ball (20).

9. A leg press for physical training as claimed in claim 1, wherein: support base (1) top rigid coupling have two symmetric distribution's second hydraulic lifting rod (21), and two the equal rigid coupling in second hydraulic lifting rod (21) top has second backup pad (22), the mouth has all been seted up in second backup pad (22) and enhancement post (24) and has been rotated, center post (23) both ends run through respectively and rotate the mouth and extend to second backup pad (22) one side.

10. A leg press for physical training as claimed in claim 1, wherein: the surface of each of two ends of the central column (23) is provided with a first external thread, the surface of the reinforcing column (24) is provided with a second external thread, the adjusting column (25) is provided with a first thread groove and a second thread groove, the first thread groove is communicated with the second thread groove, the thread pitches of the first thread groove and the first external thread are the same, and the thread pitches of the second thread groove and the second external thread are the same.