An explosion-proof lubrication pump

Abstract

The present invention discloses an explosion-proof lubrication pump, which relates to the explosion-proof field of lubrication pumps, and includes a fuel tank body, a plunger pump body assembly movably mounted on one end of the fuel tank body, a fuel filling port fixedly connected to one side of the plunger pump body assembly, a guide column movably connected to one side of the plunger pump body assembly, an upper cover movably mounted on the other end of the fuel tank body, and the other end of the guide column movably connected to the interior of the upper cover. In the present invention, when excessive grease is added, the grease will push the piston beyond the first explosion-proof pressure relief hole. At this time, the excess grease can pass through the first explosion-proof pressure relief hole into the guide hole, and finally be discharged out of the fuel tank through the waterproof breathable valve, so that the pressure in the fuel tank will never exceed the bearing limit of the fuel tank material, thereby avoiding the problem of excessive pressure causing the fuel tank to burst or causing harm to on-site workers.

Description

Technical Field

[0001] The present invention relates to the technical field of explosion-proof lubrication pumps, in particular to an explosion-proof lubrication pump. Background Art

[0002] During the operation of a wind turbine, the wind power lubrication system needs to inject grease regularly and quantitatively to grease various bearings and other operating parts to ensure the safe, stable and efficient operation of the unit equipment. The lubrication pump, as part of the wind power lubrication system, also needs to be regularly filled with grease.

[0003] In the prior art, for example, Chinese patent number CN218762623U discloses an explosion-proof electric lubrication pump, which includes a protective shell with an oil barrel inside. A pump body is provided at the bottom of the oil barrel, and the oil barrel and the pump body are connected by a lubrication mechanism. An oil barrel cover is provided on the top of the oil barrel, and a liquid level relay and a visual liquid level gauge are provided on the top of the oil barrel cover. Several explosion-proof mechanisms are provided on the inner wall of the protective shell, and the several explosion-proof mechanisms are connected by connecting pipes.

[0004] However, in the prior art, the grease filling pipeline of the grease filling pump is connected to the quick-connect refueling port, and the grease can be filled into the lubrication pump by using a grease filling pump with manual, pneumatic, electric or other power forms. During the actual operation, the injected grease will push the piston to move upward. When the piston reaches the hydraulic upper limit mark, it is necessary to immediately turn off the grease filling pump switch and stop grease filling. However, during the actual operation, the operator's attention may be distracted by other things or objects. Since the grease is injected quickly, once the operator's attention is diverted for a short while, the grease may overflow. At this time, the pressure in the oil tank of the lubrication pump cannot be quickly released, which can easily cause the oil tank to burst, thereby damaging the equipment or causing a safety accident. Summary of the Invention

[0005] The object of the present invention is to provide an explosion-proof lubrication pump to solve the problems raised by the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an explosion-proof lubrication pump, comprising a fuel tank body, a plunger pump body assembly movably mounted on one end of the fuel tank body, a fuel filling port fixedly connected to one side of the plunger pump body assembly, a guide column movably connected to one side of the plunger pump body assembly, an upper cover movably mounted on the other end of the fuel tank body, the other end of the guide column movably connected to the interior of the upper cover, a waterproof breathable valve movably mounted at the junction of the guide column and the upper cover, a piston slidably connected to the outer wall of the guide column, a pagoda spring fixedly connected to one side of the piston, and the other end of the pagoda spring fixedly connected to one side of the upper cover;

[0007] The guide column includes a column body and a movable end head, the movable end head is threadedly connected to one end of the column body, a guide hole is opened inside the column body and the movable end head, a first explosion-proof pressure relief hole and a second explosion-proof pressure relief hole are opened inside the column, the first explosion-proof pressure relief hole and the second explosion-proof pressure relief hole are connected to the guide hole, the second explosion-proof pressure relief hole is located at the end of the column body, and the first explosion-proof pressure relief hole is located in the middle section of the column body.

[0008] Preferably, a column is fixedly installed at the edge of the plunger pump body assembly, the other end of the column is movably connected to the edge of the upper cover, and a combined cap nut is movably connected at the junction of the column and the upper cover.

[0009] Preferably, the other side of the upper cover is movably connected to a support plate, and a first hexagon socket head screw is movably connected to the junction of the support plate and the upper cover, and the first hexagon socket head screw passes through the support plate.

[0010] Preferably, one end of the first hexagonal socket head screw is threadedly connected to a first hexagonal nut, the first hexagonal nut is located on one side of the support plate, and a second hexagonal nut is movably connected to the junction of the guide column and the upper cover.

[0011] Preferably, a first circular sealing ring is movably installed at the intersection of the oil tank body, the plunger pump body assembly and the upper cover, and a second circular sealing ring is movably installed at the intersection of the guide column and the plunger pump body assembly.

[0012] Preferably, a piston sealing ring is sleeved on the edge of the piston, and the piston sealing ring is located between the piston and the oil tank body.

[0013] Preferably, the other side of the plunger pump body assembly is movably connected to an electrical shield component, the bottom of the electrical shield component is movably connected to a second hexagon socket head screw, and one end of the second hexagon socket head screw is threadedly connected to the interior of the plunger pump body assembly.

[0014] Preferably, an accommodating groove is provided inside the column, and the accommodating groove surrounds the guide hole.

[0015] Preferably, a connecting rope is slidably connected to the interior of the accommodating groove, one end of the connecting rope is fixedly connected to the docking end, and the other end of the connecting rope is fixedly connected to the interior of the docking end, and the connecting rope passes through the column.

[0016] Preferably, a built-in ring is fixedly connected to the outer wall of the connecting rope, and the built-in ring is slidably connected to the inside of the guide hole. The shape of the built-in ring is adapted to the shape of the guide hole.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, a design of connecting the guide column pressure relief hole to the waterproof breathable valve is adopted, and a first explosion-proof pressure relief hole and a second explosion-proof pressure relief hole are added, and the first explosion-proof pressure relief hole and the second explosion-proof pressure relief hole are directly connected to the waterproof breathable valve. When the grease is filled in excess, the grease will push the piston beyond the first explosion-proof pressure relief hole. At this time, the excess grease can pass through the first explosion-proof pressure relief hole into the guide hole and finally be discharged out of the oil tank through the waterproof breathable valve, so that the pressure in the oil tank will never exceed the bearing limit of the oil tank material, thereby avoiding the problem of excessive pressure causing the oil tank to burst or causing harm to on-site workers, solving the problem of oil tank rupture and explosion caused by excessive grease that cannot be discharged, and also eliminating the factors of equipment explosion or damage caused by on-site workers being distracted or delayed by other things when filling grease, reducing the personal risks and direct economic losses caused by potential risks caused by centrifugal force of equipment operation and thermal expansion and contraction under weather conditions.

[0019] 2. In the present invention, a movable built-in ring is provided inside the main body, and the position of all the built-in rings can be changed by pulling the connecting rope. After the lubricating grease is injected, the connecting rope is pulled to move the built-in ring along the accommodating groove in the guide hole. The friction between the built-in ring and the wall of the guide hole is used to scrape off the grease remaining on the wall, thereby reducing the residual grease inside the guide hole, thereby avoiding the situation where the grease injected in the past is mixed with the newly injected grease, and obtaining stable lubrication quality by ensuring the purity of the grease. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the internal structure of an explosion-proof lubrication pump of the present invention;

[0021] Figure 2 A half-section top view of an oil tank body of an explosion-proof lubrication pump of the present invention;

[0022] Figure 3 This is a schematic diagram of the structural disassembly of an explosion-proof lubrication pump of the present invention;

[0023] Figure 4 This is a top view of the exploded structure of an explosion-proof lubrication pump of the present invention;

[0024] Figure 5 This is a schematic structural diagram of a guide column portion of an explosion-proof lubrication pump of the present invention;

[0025] Figure 6 This is a schematic diagram of a half-section structure of a cylinder of an explosion-proof lubrication pump of the present invention;

[0026] Figure 7 This is a schematic diagram of the disassembled guide column structure of an explosion-proof lubrication pump of the present invention.

[0027] In the figure: 1. Electrical cover component; 2. Plunger pump body assembly; 3. Column; 4. First circular sealing ring; 5. Fuel tank body; 6. Upper cover; 7. Combined cap nut; 8. Waterproof breathable valve; 9. First hexagon socket head screw; 10. Support plate; 11. First hexagonal nut; 12. Second hexagonal nut; 13. Guide column; 14. Pagoda spring; 15. Second circular sealing ring; 16. Piston; 17. Piston sealing ring; 18. Second hexagon socket head screw; 19. Fuel filler port; 131. Column; 132. Movable end; 133. First explosion-proof pressure relief hole; 134. Second explosion-proof pressure relief hole; 135. Guide hole; 136. Accommodating groove; 137. Connecting rope; 138. Built-in ring; 139. Docking end. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] Example 1

[0030] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown: an explosion-proof lubrication pump, including a tank body 5, one end of the tank body 5 is movably mounted with a plunger pump body assembly 2, one side of the plunger pump body assembly 2 is fixedly connected to a refueling port 19, one side of the plunger pump body assembly 2 is movably connected to a guide column 13, the other end of the tank body 5 is movably mounted with an upper cover 6, the other end of the guide column 13 is movably connected to the inside of the upper cover 6, a waterproof breathable valve 8 is movably mounted at the junction of the guide column 13 and the upper cover 6, a piston 16 is slidably connected to the outer wall of the guide column 13, one side of the piston 16 is fixedly connected to a pagoda spring 14, and the pagoda spring 14 is The other end is fixedly connected to one side of the upper cover 6. The guide column 13 includes a column 131 and a movable end 132. The movable end 132 is threadedly connected to one end of the column 131. A guide hole 135 is provided inside the column 131 and the movable end 132. A first explosion-proof pressure relief hole 133 and a second explosion-proof pressure relief hole 134 are provided inside the column 131. The first explosion-proof pressure relief hole 133 and the second explosion-proof pressure relief hole 134 are connected to the guide hole 135. The second explosion-proof pressure relief hole 134 is located at the end of the column 131, and the first explosion-proof pressure relief hole 133 is located in the middle section of the column 131.

[0031] In this embodiment, the plunger pump body assembly 2 is installed at one end of the oil tank body 5. When in use, after the oil filling port 19 is connected to the grease filling pump, a manual, pneumatic, electric or other power type grease filling pump can be used to fill the oil tank body 5 of the lubrication pump with grease. The injected grease will push the piston 16 to move in the oil tank body 5. The other end of the oil tank body 5 is provided with an upper cover 6 to seal the internal space. The upper cover 6 will limit the maximum movement range of the piston 16.

[0032] One end of the guide column 13 is connected to the plunger pump body assembly 2, and the other end is connected to the upper cover 6. It is located at the center of the entire oil tank body 5. The piston 16 divides the internal space of the oil tank body 5 into two parts. When grease enters the oil tank body 5, it will be between the piston 16 and the plunger pump body assembly 2. In the process of grease pushing the piston 16 to move, the piston 16 will gradually approach the first explosion-proof pressure relief hole 133 and the second explosion-proof pressure relief hole 134. When the piston 16 exceeds the first explosion-proof pressure relief hole 133, the initial warning line is reached. The grease will enter the interior of the column 131 from the first explosion-proof pressure relief hole 133, and then pass through the guide hole 135 and discharge from the waterproof breathable valve 8 to the outside, completing the pressure relief. When the grease pushes the piston 16 to exceed the second explosion-proof pressure relief hole 134, the secondary warning line is reached. The grease will enter the interior of the guide hole 135 from the first explosion-proof pressure relief hole 133 and the second explosion-proof pressure relief hole 134 at the same time, greatly accelerating the speed of pressure relief.

[0033] When there is no lubricating grease inside the oil tank body 5, the pagoda spring 14 will push the piston 16 against the plunger pump body assembly 2. Then, during the movement of the piston 16, the pagoda spring 14 will be squeezed. Since the pagoda spring 14 is in the shape of a pagoda, it can fit completely onto the upper cover 6 when being squeezed, thereby avoiding affecting the normal grease storage of the oil tank body 5.

[0034] Example 2

[0035] according to Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, one end of the fuel tank body 5 is movably mounted with a plunger pump body assembly 2, one side of the plunger pump body assembly 2 is fixedly connected to a refueling port 19, one side of the plunger pump body assembly 2 is movably connected to a guide column 13, the other end of the fuel tank body 5 is movably mounted with an upper cover 6, the other end of the guide column 13 is movably connected to the inside of the upper cover 6, a waterproof breathable valve 8 is movably mounted at the junction of the guide column 13 and the upper cover 6, a piston 16 is slidably connected to the outer wall of the guide column 13, one side of the piston 16 is fixedly connected to a pagoda spring 14, the other end of the pagoda spring 14 is fixedly connected to one side of the upper cover 6, a column 3 is fixedly mounted at the edge of the plunger pump body assembly 2, the other end of the column 3 is movably connected to the edge of the upper cover 6, the junction of the column 3 and the upper cover 6 A combined cover nut 7 is movably connected to the top cover 6, and a support plate 10 is movably connected to the other side of the upper cover 6. A first hexagon socket head screw 9 is movably connected to the junction of the support plate 10 and the upper cover 6. The first hexagon socket head screw 9 passes through the support plate 10, and one end of the first hexagon socket head screw 9 is threadedly connected to the first hexagonal nut 11. The first hexagonal nut 11 is located on one side of the support plate 10, and a second hexagonal nut 12 is movably connected to the junction of the guide column 13 and the upper cover 6. The other side of the plunger pump body assembly 2 is movably connected to the electrical shield component 1, and the bottom of the electrical shield component 1 is movably connected to the second hexagon socket head screw 18. One end of the second hexagon socket head screw 18 is threadedly connected to the inside of the plunger pump body assembly 2.

[0036] In this embodiment, the guide column 13 is fixed to the center of the upper cover 6 by the second hexagonal nut 12. The plunger pump body assembly 2 is connected to the upper cover 6 by the column 3. The connection is reinforced by the combined cap nut 7 to ensure the overall structural stability. The whole is located on the inner wall of the fuel tank body 5. The column 3 also plays a role in limiting the position of the piston 16 to prevent the piston 16 from tilting.

[0037] The other side of the upper cover 6 is connected to the support plate 10 through the first hexagonal cylindrical head screw 9. At the same time, a first hexagonal nut 11 is added to the end of the first hexagonal cylindrical head screw 9 to fix the support plate 10. The electrical cover component 1 is connected to the plunger pump body assembly 2 through the second hexagonal cylindrical head screw 18. In conjunction with the use of the upper support plate 10, it is ensured that the pump body will not tilt.

[0038] Example 3

[0039] according to Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, one end of the fuel tank body 5 is movably mounted with a plunger pump body assembly 2, one side of the plunger pump body assembly 2 is fixedly connected with a refueling port 19, one side of the plunger pump body assembly 2 is movably connected with a guide column 13, the other end of the fuel tank body 5 is movably mounted with an upper cover 6, the other end of the guide column 13 is movably connected to the inside of the upper cover 6, a waterproof breathable valve 8 is movably mounted at the junction of the guide column 13 and the upper cover 6, a piston 16 is slidably connected to the outer wall of the guide column 13, one side of the piston 16 is fixedly connected with a pagoda spring 14, the other end of the pagoda spring 14 is fixedly connected to one side of the upper cover 6, a first circular sealing ring 4 is movably mounted at the junction of the fuel tank body 5, the second circular sealing ring 15 is movably mounted at the junction of the guide column 13 and the plunger pump body assembly 2, a piston sealing ring 17 is sleeved on the edge of the piston 16, and the piston sealing ring 17 is located between the piston 16 and the fuel tank body 5.

[0040] In this embodiment, the first circular sealing ring 4 is used to fill the gap at the intersection of the oil tank body 5, the plunger pump body assembly 2 and the upper cover 6 to ensure the overall sealing of the oil tank body 5. The second circular sealing ring 15 provided at the intersection of the piston 16 and the guide column 13 is used to prevent grease from passing through the gap at the intersection of the piston 16 and the guide column 13 and entering another part of the space;

[0041] The piston sealing ring 17 provided at the edge of the piston 16 itself is used to fill the gap between the piston 16 and the oil tank body 5, thereby ensuring that the two spaces separated by the piston 16 are in a completely separated state, and preventing grease from passing through the piston 16 and entering between the piston 16 and the upper cover 6.

[0042] Example 4

[0043] according to Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7As shown, the guide column 13 includes a column 131 and a movable end 132, the movable end 132 is threadedly connected to one end of the column 131, a guide hole 135 is opened inside the column 131 and the movable end 132, a first explosion-proof pressure relief hole 133 and a second explosion-proof pressure relief hole 134 are opened inside the column 131, the first explosion-proof pressure relief hole 133 and the second explosion-proof pressure relief hole 134 are connected to the guide hole 135, the second explosion-proof pressure relief hole 134 is located at the end of the column 131, the first explosion-proof pressure relief hole 133 is located in the middle section of the column 131, and the column 131 An accommodating groove 136 is provided inside the accommodating groove 136, which surrounds the guide hole 135. A connecting rope 137 is slidably connected to the inside of the accommodating groove 136. One end of the connecting rope 137 is fixedly connected to a docking end 139, and the other end of the connecting rope 137 is fixedly connected to the inside of the docking end 139. The connecting rope 137 passes through the column 131, and a built-in ring 138 is fixedly connected to the outer wall of the connecting rope 137. The built-in ring 138 is slidably connected to the inside of the guide hole 135, and the shape of the built-in ring 138 is adapted to the shape of the guide hole 135.

[0044] In this embodiment, the first explosion-proof pressure relief hole 133 and the second explosion-proof pressure relief hole 134 are two pressure relief standards, wherein the first explosion-proof pressure relief hole 133 is a first-level pressure relief standard, and the second explosion-proof pressure relief hole 134 is a second-level pressure relief standard, which is used to gradually increase the pressure relief speed. The accommodating groove 136 is arranged around the guide hole 135, and the connecting rope 137 is placed in the accommodating groove 136. The two ends are connected together by the docking end 139 to form a closed loop.

[0045] Under normal conditions, the built-in ring 138 is in the guide hole 135 and will not affect the normal discharge of grease. After the grease injection is completed, the movable end 132 is removed from the column 131, and then the connecting rope 137 is pulled to drive the built-in ring 138 to move in the guide hole 135. The friction between the built-in ring 138 and the column 131 is used to scrape the residual grease in the guide hole 135 away from the column 131. The setting of multiple built-in rings 138 can ensure the effect of scraping off the grease. After scraping off the grease, it can effectively prevent the past grease from mixing with the new grease.

[0046] The method of use and working principle of this device are as follows: when in use, the refueling port 19 is connected to the grease pump, and then the lubricating grease is injected into the fuel tank body 5 from the refueling port 19. The space inside the fuel tank body 5 is divided into two spaces by the piston 16. The lubricating grease injected into the fuel tank body 5 is located between the piston 16 and the plunger pump body assembly 2;

[0047] The first explosion-proof pressure relief hole 133 and the second explosion-proof pressure relief hole 134 in the guide column 13 divide the pump body into two levels of pressure relief standards. The injected lubricating grease will push the piston 16 to move along the direction of the guide column 13. When the piston 16 passes over the first explosion-proof pressure relief hole 133, the grease will enter the guide hole 135 in the column 131 from the first explosion-proof pressure relief hole 133, and then be discharged to the outside through the waterproof breathable valve 8. When the piston 16 passes over the second explosion-proof pressure relief hole 134, the grease will simultaneously enter the guide hole 135 from the first explosion-proof pressure relief hole 133 and the second explosion-proof pressure relief hole 134, and then be discharged to the outside through the waterproof breathable valve 8. At this time, the pressure relief efficiency reaches the maximum;

[0048] After the lubricating grease is replenished, the pump body is opened and the movable end 132 is removed. The connecting rope 137 is pulled to drive the internal ring 138 to move in the guide hole 135. The specific movement route is restricted by the accommodating groove 136. When the internal ring 138 moves, friction is generated between it and the column 131. The friction is used to scrape the lubricating grease remaining on the wall of the guide hole 135 away from the column 131 to prevent the lubricating grease from mixing with the subsequently injected grease, thereby ensuring the purity of the lubricating grease.

[0049] During the entire process, the first circular sealing ring 4 is used to ensure the overall sealing of the oil tank body 5, and the second circular sealing ring 15 is used to prevent grease from passing through the gap at the junction of the piston 16 and the guide column 13 and entering between the piston 16 and the upper cover 6. The piston sealing ring 17 will fill the gap between the piston 16 and the oil tank body 5.

[0050] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An explosion-proof lubrication pump, comprising an oil tank body (5), characterized in that: One end of the oil tank body (5) is movably mounted with a plunger pump body assembly (2), one side of the plunger pump body assembly (2) is fixedly connected with a refueling port (19), one side of the plunger pump body assembly (2) is movably connected with a guide column (13), the other end of the oil tank body (5) is movably mounted with an upper cover (6), the other end of the guide column (13) is movably connected to the interior of the upper cover (6), a waterproof breathable valve (8) is movably mounted at the junction of the guide column (13) and the upper cover (6), a piston (16) is slidably connected to the outer wall of the guide column (13), one side of the piston (16) is fixedly connected with a pagoda spring (14), and the other end of the pagoda spring (14) is fixedly connected to one side of the upper cover (6); The guide column (13) includes a column (131) and a movable end (132), the movable end (132) is threadedly connected to one end of the column (131), a guide hole (135) is provided inside the column (131) and the movable end (132), a first explosion-proof pressure relief hole (133) and a second explosion-proof pressure relief hole (134) are provided inside the column (131), the first explosion-proof pressure relief hole (133) and the second explosion-proof pressure relief hole (134) are connected to the guide hole (135), the second explosion-proof pressure relief hole (134) is located at the end of the column (131), and the first explosion-proof pressure relief hole (133) is located in the middle section of the column (131); A column (3) is fixedly installed at the edge of the plunger pump body assembly (2), and the other end of the column (3) is movably connected to the edge of the upper cover (6). A combined cover nut (7) is movably connected at the intersection of the column (3) and the upper cover (6). A support plate (10) is movably connected to the other side of the upper cover (6). A first hexagon socket head screw (9) is movably connected at the intersection of the support plate (10) and the upper cover (6). The first hexagon socket head screw (9) passes through the support plate (10). The first hexagon socket head screw (9) One end of the guide post (13) is threadedly connected to a first hexagonal nut (11), and the first hexagonal nut (11) is located on one side of the support plate (10). The intersection of the guide post (13) and the upper cover (6) is movably connected to a second hexagonal nut (12). The intersections of the oil tank body (5), the plunger pump body assembly (2) and the upper cover (6) are all movably installed with a first circular sealing ring (4). The intersection of the guide post (13) and the plunger pump body assembly (2) is movably installed with a second circular sealing ring (15). The edge of the piston (16) is sleeved with a piston sealing ring (17). The piston seal ring (17) is located between the piston (16) and the oil tank body (5). The other side of the plunger pump body assembly (2) is movably connected to the electrical shield component (1). The bottom of the electrical shield component (1) is movably connected to a second hexagon socket head screw (18). One end of the second hexagon socket head screw (18) is threadedly connected to the inside of the plunger pump body assembly (2). The inside of the column (131) is provided with a receiving groove (136). The receiving groove (136) surrounds the guide hole (135). The receiving groove The interior of (136) is slidably connected to a connecting rope (137), one end of the connecting rope (137) is fixedly connected to a docking end (139), and the other end of the connecting rope (137) is fixedly connected to the interior of the docking end (139). The connecting rope (137) passes through the column (131), and an internal ring (138) is fixedly connected to the outer wall of the connecting rope (137). The internal ring (138) is slidably connected to the interior of the guide hole (135), and the shape of the internal ring (138) is adapted to the shape of the guide hole (135).

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