Detachable inverted-U-shaped oil tank structure

Abstract

The embodiment of the invention provides a detachable inverted-U-shaped oil tank structure, and relates to the technical field of oil tank structures. A detachable inverted-U-shaped oil tank structure comprises an oil tank body assembly, the oil tank body assembly is manufactured through welding and is of an inverted-U-shaped structure, two sets of connecting sleeves are welded between the top and the bottom of the oil tank body assembly in an inlaid mode, installation screws are installed in each set of connecting sleeves, and a positioning pin is arranged at the bottom of the oil tank body assembly. A central small hole is formed in the positioning pin for lubricating oil to pass through, and the oil tank body assembly is fixed on the walking part of the coal mining machine through the positioning pin and two groups of mounting screws. The oil tank body assembly is conveniently disassembled and assembled through the positioning pin and the mounting screw, the welding-inlaid connection sleeve prevents oil leakage, the inverted-U-shaped structure avoids a long lead screw and has the oil dripping function of adjusting the flow speed of lubricating oil, and therefore maintenance convenience, working efficiency and safety and reliability of equipment operation are improved.

Description

Technical Field

[0001] This application relates to the technical field of fuel tank structures, and more specifically, to a detachable inverted U-shaped fuel tank structure. Background Art

[0002] Coal resources are rich in reserves, and the popularization of fully mechanized coal mining in coal mines is relatively high. This mechanized method not only greatly improves the coal mining efficiency but also significantly enhances the safety guarantee for coal mine production workers. Fully mechanized coal mining, abbreviated as "fully-mechanized mining", refers to an efficient coal mining process that uses mechanical methods to break coal, load coal, transports the coal through a flexible scraper conveyor, and supports the roof of the working face with self-advancing hydraulic supports. The working face using this equipment and process is usually called a "fully-mechanized working face".

[0003] The main supporting equipment for a fully-mechanized working face includes: a shearer, a flexible scraper conveyor, and a self-advancing hydraulic support, abbreviated as the "three machines".

[0004] The scraper conveyor is the main transportation equipment in the coal mining face. In addition to transporting coal, it also serves as the support and running track for the shearer. The shearer is installed on the scraper conveyor and is supported by two support shoes on the coal wall side and two guiding shoes on the gob side on the trough side and tooth rail of the conveyor respectively. The guiding shoes in the open-type traveling box of the shearer are guided along the direction of the conveyor tooth rail, and the traveling wheels in the open-type traveling box of the shearer mesh with the conveyor tooth rail, enabling the shearer to move in the forward or reverse direction of the conveyor.

[0005] Since the lower part of the traveling gearbox is an open drive and cannot store oil, without lubrication, the long-term meshing of the traveling wheels and the tooth rail will cause rapid wear of the traveling wheels and the tooth rail. Therefore, it is particularly necessary to install a drip-feed lubrication fuel tank on the upper part of the traveling gearbox. A common practice is to use manual lubrication, that is, workers regularly lubricate the traveling wheels and the tooth rail. Although this method is simple and direct, it has obvious limitations, including uneven lubrication, difficult-to-guarantee frequency, and inconvenient operation. Especially in a harsh working environment, manual lubrication may not be carried out in time, resulting in increased equipment wear; some solutions may use simple drip-feed devices to provide continuous lubrication, but these simple devices are not convenient for matching installation according to the equipment conditions of the shearer. Summary of the Invention

[0006] A detachable inverted U-shaped fuel tank structure according to an embodiment of the present application includes a fuel tank body assembly. The fuel tank body assembly is made by welding and has an inverted "U" shape. Two sets of connecting sleeves are welded between the top and bottom of the fuel tank body assembly. Each set of connecting sleeves is provided with mounting screws. A positioning pin is provided at the bottom of the fuel tank body assembly. A central small hole is opened in the positioning pin for lubricating oil to pass through. The fuel tank body assembly is fixed on the traveling part of the shearer through the positioning pin and two sets of mounting screws.

[0007] Further, an adjusting screw is threadedly connected to one side of the positioning pin. The adjusting screw is used to adjust the flow rate of the lubricating oil.

[0008] Further, a second plug is installed at the top of the fuel tank body assembly. Cross-intersecting small holes are drilled in the second plug, and a rotating handle is welded to the upper part of the second plug.

[0009] Further, three screw-in circular oil gauges are installed on the front panel of the fuel tank body assembly. A sealing copper gasket is embedded on one side of the screw-in circular oil gauge.

[0010] Further, washers are provided at the contact parts between the mounting screws and the connecting sleeves.

[0011] Further, a first plug is also installed at the top of the fuel tank body assembly.

[0012] Further, a support sleeve is sleeved outside the positioning pin. A pair of clamping plates slide on one side of the support sleeve. The clamping plates fix the upper and lower sides of the adjusting screw.

[0013] Further, a positioning sleeve is fixedly provided on the lower side of the support sleeve. The positioning sleeve is sleeved outside the positioning pin. An annular piece is provided on the lower side of the positioning sleeve.

[0014] Further, sliders are provided on one side of each of the pair of clamping plates. A turntable is provided on one side of the support sleeve. A pair of rotating grooves are opened on the turntable. The two sliders slide in the pair of rotating grooves respectively. Limiting grooves are symmetrically opened on the inner side of the support sleeve. Sliding strips provided on both sides of the clamping plate slide in the limiting grooves.

[0015] Further, a plug rod is inserted into one side of the turntable. A jack is opened on the plug rod. A sliding hole is opened on one side of the support sleeve. When the plug rod is inserted into the sliding hole, the fixing rod is inserted into the jack in a plug-in fit.

[0016] 1. The beneficial effects of this application are as follows: By means of the positioning pin and two mounting screws, the fuel tank body assembly can be installed on the upper part of the shearer traveling box, making the disassembly and assembly of the fuel tank body assembly convenient. Since the connecting sleeve structure is inlaid and welded between the top and bottom plates of the fuel tank, the oil in the fuel tank will not flow out during the disassembly and assembly of the mounting screws, nor will it get onto the mounting screws. The inverted U-shaped fuel tank body assembly structure can avoid the long lead screw on the upper part of the shearer, facilitating the installation of the long lead screw from the side. The positioning pin at the lower part of the fuel tank body assembly also has the function of dripping oil, and the flow rate of the lubricating oil is adjusted by the adjusting screw inside the positioning pin, slowly dripping onto the gears of the open-type traveling gearbox to complete the lubrication of the open-type gear drive. This design not only improves the maintenance convenience and working efficiency of the fuel tank body assembly, but also enhances the safety and reliability of the equipment operation, and at the same time plays a positive role in maintaining the good working condition of the equipment.

[0017] The additional aspects and advantages of this application will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of this application, the following will briefly introduce the drawings required to be used in the embodiments of this application. It should be understood that the following drawings only show some embodiments of this application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0019] Figure 1 is the first side view schematic diagram of the overall detachable inverted U-shaped fuel tank structure according to the embodiment of this application; Figure 2 is the top view schematic diagram of the overall structure according to the embodiment of this application; Figure 3 is the second side view schematic diagram of the overall structure according to the embodiment of this application; Figure 4 is according to the embodiment of this application Figure 3 is the sectional view along the A-A structure; Figure 5 is according to the embodiment of this application Figure 4 is the sectional view along the C-C structure; Figure 6 is the schematic diagram of the installation state of the positioning sleeve according to the embodiment of this application; Figure 7 is the schematic diagram of structures such as the support sleeve according to the embodiment of this application; Figure 8 is the split schematic diagram of the positioning sleeve and turntable structures according to the embodiment of this application; Figure 9It is a schematic diagram of the disassembly of the card board and support sleeve structure according to the embodiments of the present application.

[0020] Icons: 1. Fuel tank box assembly; 2. Sealing copper gasket; 3. Screw-in round oil level gauge; 4. Plug one; 5. Plug two; 6. Positioning pin; 7. Adjusting screw; 8. Mounting screw; 9. Washer; 10. Connecting sleeve; 11. Support sleeve; 12. Positioning sleeve; 13. Ring piece; 14. Card board; 15. Slide block; 16. Turntable; 17. Rotating groove; 18. Insert rod; 19. Insert hole; 20. Limit groove; 21. Slide bar; 22. Slide hole; 23. Fixed rod. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings in the embodiments of the present application.

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application.

[0026] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0027] In this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0029] Embodiment 1 The following describes a detachable inverted U-shaped fuel tank structure according to an embodiment of the present application with reference to the accompanying drawings.

[0030] As Figures 1-5 shown, a detachable inverted U-shaped fuel tank structure according to an embodiment of the present application includes a fuel tank box assembly 1. The fuel tank box assembly 1 is made by welding process and its structure is designed in an inverted "U" shape. This unique shape can not only effectively avoid the long lead screw on the upper part of the coal shearer, but also facilitate the installation of the long lead screw from the side.

[0031] Between the top and bottom of the fuel tank box assembly 1, two sets of coupling sleeves 10 are ingeniously welded. Each set of coupling sleeves 10 is equipped with mounting screws 8 of model M16x240. In order to enhance the sealing performance and stability of the connection part, washers 9 are specially provided at the parts where the mounting screws 8 contact the coupling sleeves 10. In addition, positioning pins 6 are assembled at the bottom of the fuel tank box assembly 1. The positioning pins 6 are precisely installed in the positioning holes on the upper part of the walking part, ensuring the stable installation of the fuel tank box assembly 1.

[0032] By using two sets of mounting screws 8 and positioning pins 6, the installation or disassembly of the fuel tank body assembly 1 can be conveniently completed. This design greatly simplifies the maintenance process and improves work efficiency. It is worth mentioning that due to the design of the welded-in coupling sleeve 10, during the disassembly and assembly of the fuel tank body assembly 1 using the mounting screws 8, the oil in the fuel tank body assembly 1 will not accidentally flow out, and the situation of oil contaminating the mounting screws 8 is also avoided, thus maintaining the cleanliness and good working condition of the equipment. This design not only reflects the simplicity and practicality of the structure, but also enhances the safety and reliability of the equipment operation, which has a positive significance for extending the service life of the equipment.

[0033] In addition, a central small hole is provided in the positioning pin 6 at the lower part of the fuel tank body assembly 1. The central small hole has the function of dripping oil, enabling the lubricating oil in the fuel tank body assembly 1 to slowly drip onto the gears of the open-type walking gearbox to complete the lubrication of the open-type gear transmission.

[0034] Furthermore, an adjusting screw 7 with a threaded connection is designed on one side of the positioning pin 6. Its end is precisely located in the central hole of the positioning pin 6. By rotating the adjusting screw 7, its position in the central hole can be adjusted, thereby changing the spatial area through which the lubricating oil flows, and then accurately controlling the flow rate of the lubricating oil. This design not only ensures that the lubricating oil can drip onto the gears of the open-type walking gearbox at an appropriate rate to achieve the best lubrication effect, but also facilitates maintenance personnel to flexibly adjust according to the actual usage situation.

[0035] In addition, a second plug 5 is installed on the top of the fuel tank body assembly 1. The design of the second plug 5 is ingenious. There are cross-intersecting small holes inside it, endowing it with the function of ventilation, effectively preventing operation inconvenience or oil leakage caused by the internal and external pressure difference. To improve the operation convenience, a rotating handle is welded on the upper part of the second plug 5, enabling maintenance personnel to manually disassemble and assemble the second plug 5 quickly without any tools, greatly improving work efficiency and convenience. At the same time, a first plug 4 is also assembled on the top of the fuel tank body assembly 1 to provide additional sealing protection for the fuel tank.

[0036] On the front panel of the fuel tank body assembly 1, three screw-in round oil gauges 3 are carefully installed. Sealing copper gaskets 2 are embedded on one side of these screw-in round oil gauges 3, which not only ensures the good sealing performance of the observation window, but also facilitates the operator to check the oil level inside the fuel tank body assembly 1 at any time. This setting not only enhances the safety and reliability of the equipment, but also helps to detect and handle potential problems in a timely manner, ensuring that the fuel tank body assembly 1 always maintains the best working state.

[0037] Embodiment 2 Considering that during the long-term operation of the shearer, the adjusting screw 7 may become loose or even fall off due to equipment vibration, based on the design of the above embodiments, optimizations and improvements have been made on this basis to ensure higher stability and reliability. Refer to Figures 6-9 as shown.

[0038] Specifically, a support sleeve 11 is added outside the positioning pin 6. The support sleeve 11 is designed in a ring structure. A pair of slidable clamping plates 14 are provided on one side of the support sleeve 11. These two clamping plates 14 are respectively clamped on the upper and lower sides of the adjusting screw 7, thus effectively enhancing the stability of the adjusting screw 7 and preventing it from being displaced or accidentally falling off due to long-term vibration of the equipment. This design not only improves the stability of the adjusting screw 7 but also ensures the long-term effectiveness of the lubricating oil flow rate adjustment function.

[0039] To further improve the service stability of the support sleeve 11, a positioning sleeve 12 is fixedly installed on the lower side of the support sleeve 11. The positioning sleeve 12 is also designed in a ring shape and sleeved outside the positioning pin 6. A firm connection can be achieved between the positioning sleeve 12 and the positioning pin 6 through appropriate fixing methods. In addition, an annular piece 13 is provided at the bottom of the positioning sleeve 12. The function of this annular piece 13 is to seal the contact part between the positioning pin 6 and the positioning hole on the walking box, effectively preventing dust and other impurities from entering and ensuring the cleanliness and tightness of the connection.

[0040] By firmly fixing the positioning sleeve 12 to the walking box with bolts, not only is the overall installation stability of the fuel tank body assembly 1 greatly improved, but also the effective positioning of the adjusting screw 7 is achieved, avoiding its accidental movement during machine operation. Such design optimization not only enhances the safety and reliability of the equipment but also provides convenient conditions for subsequent maintenance, making the overall structure more reasonable and compact, adapting to the requirements of complex and changeable working environments, and at the same time extending the service life of the equipment.

[0041] To ensure that a pair of clamping plates 14 can quickly and accurately position the adjusting screw 7, sliders 15 are provided on one side of each clamping plate 14. These sliders 15 cooperate with the rotating grooves 17 on the turntable 16 installed on one side of the support sleeve 11. Specifically, a pair of rotating grooves 17 are opened on the turntable 16, and the two sliders 15 slide in the corresponding rotating grooves 17 respectively. The ingenious design of the slider 15 lies in that its end has a specific size, which not only ensures that the slider 15 can slide freely in the rotating groove 17 but also prevents the accidental separation between the turntable 16 and the slider 15.

[0042] When the rotary turntable 16 is rotated, since the slider 15 is restricted to slide within the rotating groove 17, this mechanism drives the clamping plate 14 to move along a predetermined trajectory, thereby achieving rapid and accurate positioning of the adjusting screw 7. This design not only improves the operation efficiency but also enhances the stability and reliability of the system.

[0043] To further enhance the stability of the clamping plate 14, limiting grooves 20 are symmetrically formed on the inner side of the support sleeve 11. The sliding strips 21 provided on both sides of the clamping plate 14 slide precisely within these limiting grooves 20. This structure not only accurately defines the sliding direction of the clamping plate 14 to ensure its movement along the expected path but also effectively prevents accidental separation between the clamping plate 14 and the support sleeve 11, increasing the durability and safety of the entire device.

[0044] In summary, through the coordinated action of components such as the slider 15, the turntable 16, and the limiting grooves 20, this design significantly improves the efficiency and accuracy of the clamping plate 14 in positioning the adjusting screw 7, while greatly enhancing the stability and reliability of the overall structure.

[0045] To further improve the fixing effect of the clamping plate 14 on the adjusting screw 7 and ensure the stability and reliability of the entire system, a plug rod 18 is designed on one side of the turntable 16. A jack 19 is formed on the plug rod 18, while a sliding hole 22 is provided on one side of the support sleeve 11. In addition, a fixing rod 23 is equipped, and the fixing rod 23 can penetrate the wall surface of the sliding hole 22 from top to bottom.

[0046] When it is necessary to rotate the turntable 16 to cause the clamping plate 14 to fix the adjusting screw 7, the operation process is as follows: First, rotate the turntable 16 to accurately position and fix the adjusting screw 7 with the clamping plate 14. Next, rotate the plug rod 18 to a position corresponding to the sliding hole 22 and insert it into the sliding hole 22. At this time, the key step is to insert the fixing rod 23 from above the sliding hole 22 and make it pass through the jack 19 on the plug rod 18. This design not only ensures that the turntable 16 will not rotate or loosen accidentally after positioning but also greatly enhances the fixing effect of the clamping plate 14 on the adjusting screw 7.

[0047] In summary, the working principle of a detachable inverted U-shaped fuel tank structure is as follows: The fuel tank body assembly 1 is installed on the upper part of the traveling box of the shearer through the mounting screws 8 and the positioning pins 6. The lubricating oil inside the fuel tank body assembly 1 drips into the gear part of the traveling box through the central hole of the positioning pin 6. By rotating the adjusting screw 7, the flow rate of the lubricating oil is adjusted. After the adjusting screw 7 is adjusted to the proper position, the turntable 16 is rotated. Since the slider 15 is connected to the clamping plate 14 and the slider 15 is located in the rotating groove 17 on the turntable 16, when the turntable 16 is rotated, the slider 15 will slide in the rotating groove 17. As the turntable 16 rotates, the movement of the slider 15 in the rotating groove 17 will drive the clamping plate 14 to move along a predetermined path. When the clamping plate 14 is slid to the designated position, it will be clamped on both the upper and lower sides of the adjusting screw 7, thereby firmly clamping the adjusting screw 7 and preventing it from loosening or shifting due to equipment vibration or other reasons. An insertion rod 18 is inserted into one side of the turntable 16 and rotated to a position corresponding to the sliding hole 22 on the support sleeve 11, and then the insertion rod 18 is inserted into the sliding hole 22. Then, a fixing rod 23 is inserted from above so that it passes through the insertion hole 19 on the insertion rod 18, which can ensure that the turntable 16 will not rotate or loosen accidentally, thereby maintaining the stable clamping of the clamping plate 14 on the adjusting screw 7. Secondly, the positioning sleeve 12 is fixed to the traveling box by bolts, which enhances the stability of the fuel tank body assembly 1.

[0048] The above are only the embodiments of the present application and are not used to limit the protection scope of the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0049] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, and all should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A detachable inverted U-shaped fuel tank structure, characterized in that: It includes a fuel tank box assembly (1). The fuel tank box assembly (1) is made by welding and has an inverted "U" - shaped structure. Two groups of connecting sleeves (10) are inlaid and welded between the top and bottom of the fuel tank box assembly (1). An installation screw (8) is installed in each group of connecting sleeves (10). A positioning pin (6) is arranged at the bottom of the fuel tank box assembly (1). A central small hole is opened in the positioning pin (6) for lubricating oil to pass through. The fuel tank box assembly (1) is fixed on the traveling part of the shearer through the positioning pin (6) and two groups of installation screws (8).

2. The detachable inverted U-shaped fuel tank structure according to claim 1, characterized in that: A regulating screw (7) is thread - connected to one side of the positioning pin (6). The regulating screw (7) is used to regulate the flow rate of the lubricating oil.

3. The detachable inverted U-shaped fuel tank structure according to claim 2, characterized in that: A second plug (5) is installed at the top of the fuel tank box assembly (1). Cross - intersecting small holes are drilled in the second plug (5), and a rotating handle is welded to the upper part of the second plug (5).

4. The detachable inverted U-shaped fuel tank structure according to claim 3, wherein: Three screw - in circular oil gauges (3) are installed on the front panel of the fuel tank box assembly (1). A sealing copper gasket (2) is embedded on one side of the screw - in circular oil gauge (3).

5. The detachable inverted U-shaped fuel tank structure according to claim 4, characterized in that: A washer (9) is arranged at the contact part between the installation screw (8) and the connecting sleeve (10).

6. The detachable inverted U-shaped fuel tank structure according to claim 5, wherein: A first plug (4) is also installed at the top of the fuel tank box assembly (1).

7. The detachable inverted U-shaped fuel tank structure according to claim 1, wherein: A support sleeve (11) is sleeved outside the positioning pin (6). A pair of clamping plates (14) slide on one side of the support sleeve (11). The clamping plates (14) fix the upper and lower sides of the regulating screw (7).

8. The detachable inverted U-shaped fuel tank structure according to claim 7, wherein: A positioning sleeve (12) is fixedly arranged at the lower side of the support sleeve (11). The positioning sleeve (12) is sleeved outside the positioning pin (6). An annular piece (13) is arranged at the lower side of the positioning sleeve (12).

9. The detachable inverted U-shaped fuel tank structure according to claim 8, wherein: Sliders (15) are arranged on one side of a pair of clamping plates (14). A turntable (16) is arranged on one side of the support sleeve (11). A pair of rotating grooves (17) are opened on the turntable (16). The two sliders (15) slide in the pair of rotating grooves (17) respectively. Limiting grooves (20) are symmetrically opened inside the support sleeve (11). Sliding strips (21) arranged on both sides of the clamping plate (14) slide in the limiting grooves (20).

10. The detachable inverted U-shaped fuel tank structure according to claim 9, characterized in that: A plug rod (18) is inserted into one side of the turntable (16). A jack (19) is opened on the plug rod (18). A sliding hole (22) is opened on one side of the support sleeve (11). A fixing rod (23) penetrates through the wall surface of the sliding hole (22) from top to bottom. When the plug rod (18) is inserted into the sliding hole (22), the fixing rod (23) is inserted and matched with the jack (19).

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