Deep sea closable sediment sampler

Abstract

The invention discloses a deep-sea closable sediment sampler, and relates to the technical field of samplers, the deep-sea closable sediment sampler comprises a sampling bin, bin doors and bin door opening and closing mechanisms, the bottom of the sampling bin is open and is movably provided with at least one bin door, the sampling bin is used for being inserted into deep-sea sediments, and the bin doors are connected with the bin door opening and closing mechanisms; an operating rod of the bin door opening and closing mechanism is connected with a manipulator; the manipulator drives the operating rod to lift to open and close the bin door. According to the sealable sediment sampler for the deep sea submersible, the operating rod is clamped and operated by a single hand of the submersible manipulator, then the bin gate opening and closing mechanism is driven to close the bin gate after sampling, sediment is sealed in the sampler, sediment samples are prevented from flowing out, and the sampling efficiency of loose sediment is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of samplers, and particularly to a deep-sea closable sediment sampler. Background Art

[0002] Generally, the sea area with a depth greater than 1000m is called the deep sea. Different from other fields of the ocean, the research in the deep-sea field highly depends on the development of deep-sea engineering technology. The research in the deep-sea field mainly includes the experimental mining of mineral resources such as deep-sea manganese nodules, cobalt-rich crusts, and sulfides. For this purpose, various types of mining collector devices with different functions have been developed currently.

[0003] Among them, the seabed sediments contain marine microorganisms, mineral deposits, etc., which are of great significance for studying marine biological ecology, marine geology, ocean currents, etc. Therefore, manned submersibles and unmanned remotely operated vehicles will carry several sediment samplers to obtain deep-sea sediments for analysis. Currently, for traditional sediment samplers, due to their structural characteristics, the bottom can only adopt an open structure, and the bottom cannot be closed after sampling. They are unable to sample low-viscosity loose sediments, and the sediment is likely to flow away after sampling. While the large-scale closable sediment samplers have complex structures and operations, and high manufacturing costs, which are not suitable for large-scale applications on manned submersibles and remotely operated vehicles. Therefore, there is an urgent need for a closable sediment sampler. Summary of the Invention

[0004] The purpose of the present invention is to provide a deep-sea closable sediment sampler to solve the problems existing in the above-mentioned prior art, enabling closable sampling of deep-sea sediments, preventing the outflow of sediment samples, and improving the sampling efficiency of loose sediments.

[0005] To achieve the above purpose, the present invention provides the following solution:

[0006] The present invention provides a deep-sea closable sediment sampler, including a sampling chamber, a chamber door, and a chamber door opening and closing mechanism. The bottom of the sampling chamber is open and at least one chamber door is movably arranged. The sampling chamber is used to be inserted into deep-sea sediments. The chamber door is connected with the chamber door opening and closing mechanism. The operating rod of the chamber door opening and closing mechanism is used to be connected with a manipulator, and the manipulator drives the operating rod to lift and can realize the opening and closing of the chamber door.

[0007] Preferably, the sampling chamber includes a tip side plate, a rectangular side plate, and a top cover. The front and rear sides of the top cover are respectively fixedly connected with the tip side plates, and the left and right sides are respectively fixedly connected with the rectangular side plates. The tip side plate is fixedly connected with the adjacent rectangular side plate to form a chamber body with an open bottom. The tip of the tip side plate is located below and protrudes from the length of the rectangular side plate.

[0008] Preferably, the tip side plates, between the rectangular side plates and the top cover, and between the tip side plates and the adjacent rectangular side plates are fixedly connected by bolts or rivets.

[0009] Preferably, U-shaped slides are provided at the lower ends of two opposite tip side plates of the sampling bin, one side of the bin door is slidably disposed in one of the U-shaped slides respectively. When the bin door is open, it is located in the vertical section of the U-shaped slide, and when the bin door is closed, it is located in the bottom bending section of the U-shaped slide. One end of the bin door is connected with the bin door opening and closing mechanism.

[0010] Preferably, there are two bin doors, which are symmetrically arranged at both ends of the U-shaped slide.

[0011] Preferably, the bin door opening and closing mechanism is provided at the lower end of the rectangular side plate of the sampling bin. The bin door is located inside the rectangular side plate. When the bin door is open, the bin door is arranged parallel to the rectangular side plate. When the bin door is closed, the end of the bin door fits and seals with the end of the rectangular side plate.

[0012] Preferably, the bin door opening and closing mechanism includes a guide rod, a slider and a lifting assembly. The two ends of the guide rod are respectively connected to the rectangular side plate of the sampling bin through a fixing seat. A chute is provided on the rectangular side plate. The chute and the guide rod are both vertical and parallel. The outer end of the slider is slidably disposed on the guide rod, and the inner end penetrates through the chute and is fixedly connected to the upper end of the bin door. The outer end of the slider is also connected with the lifting assembly.

[0013] Preferably, a telescopic member is provided between the slider and the upper fixing seat. The telescopic member is a compression spring, and the length of the compression spring is at least the same as the length of the guide rod.

[0014] Preferably, the lifting assembly includes an operating rod, a pulling rope and a support seat. The support seat is provided on the top cover of the sampling bin. The lower end of the operating rod penetrates through the top plate of the support seat. A breakable positioning pin is provided at the lower end of the operating rod. The breakable positioning pin is clamped above the top plate of the support seat. When the breakable positioning pin is not broken, the lower end of the operating rod is inserted into the top cover. One end of the pulling rope is movably connected to the lower end of the operating rod, and the other end is fixedly connected to the slider. When the upper end of the operating rod is lifted by the manipulator, after there is a gap between the lower end of the operating rod and the top cover, the pulling rope can be separated from the lower end of the operating rod, and the telescopic member is reset and elongated downward.

[0015] Preferably, the operating rod is a T-shaped rod, and a fixed positioning pin is further provided at the lower end of the operating rod. The fixed positioning pin is located below the top plate of the support base, and the distance between the fixed positioning pin and the breakable positioning pin is greater than the length of the operating rod inserted into the top cover.

[0016] Preferably, a tapered body is provided at the lower end of the operating rod. A stepped shaft is provided at the lower end of the operating rod and a tapered body is provided at the end. A trigger spring is provided between the stepped surface of the stepped shaft and the top plate of the support base. The fixed positioning pin is located above the tapered body. An insertion hole is provided on the top cover. When the tapered body is inserted into the insertion hole, the fixed positioning pin is located above the top cover.

[0017] Preferably, a snap ring is provided at one end of the pull rope. The snap ring is movably sleeved on the lower end of the operating rod and is located below the fixed positioning pin.

[0018] The present invention has achieved the following technical effects compared with the prior art:

[0019] The present invention provides a closable sediment sampler for a deep-sea submersible. By using the manipulator of the submersible to hold and operate the operating rod with one hand, the hatch opening and closing mechanism is driven to close the hatch after sampling, so as to seal the sediment inside the sampler and prevent the sediment sample from flowing out, greatly improving the sampling efficiency of loose sediment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic diagram of the overall structure of the deep-sea closable sediment sampler in the embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the sampling chamber in the embodiment of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the tip side plate and the U-shaped slideway in the embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure when the hatch is closed in the embodiment of the present invention.

[0025] Figure 5 It is a schematic diagram of the structure of the telescopic member and the lifting assembly in the embodiment of the present invention.

[0026] Figure 6 This is a schematic structural diagram of the slider in the embodiment of the present invention.

[0027] Figure 7 This is a schematic diagram of the operating principle of the operating rod in the embodiment of the present invention.

[0028] Figure 8 This is a schematic structural diagram of the operating rod in the embodiment of the present invention.

[0029] Figure 9 This is a schematic structural diagram of the pull rope in the embodiment of the present invention.

[0030] Figure 10 This is a schematic diagram of the usage principle in the embodiment of the present invention.

[0031] Figure 11 This is a schematic diagram of the sampling process of the deep-sea closable sediment sampler in the embodiment of the present invention.

[0032] Figure 12 This is a schematic diagram of the operation of the deep-sea closable sediment sampler in the embodiment of the present invention.

[0033] In the figure: 1 - Deep-sea closable sediment sampler, 2 - Support base, 3 - Lifting assembly, 4 - Telescopic member, 5 - Sampling bin, 6 - Bolt, 7 - Operating rod, 8 - Snap ring, 9 - Pull rope, 10 - Fixed seat, 11 - Pressure spring, 12 - Slider, 13 - Guide rod, 14 - Slide groove, 15 - Bin door, 16 - U-shaped slideway, 17 - Top cover, 18 - Rectangular side plate, 19 - Tip side plate, 20 - Transparent plate, 21 - Manipulator, 22 - Fixed positioning pin, 23 - Fracturable positioning pin, 24 - Pin, 25 - Trigger spring. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] The purpose of the present invention is to provide a deep-sea closable sediment sampler to solve the problems existing in the prior art, enable closable sampling of deep-sea sediments, prevent the outflow of sediment samples, and improve the sampling efficiency of loose sediments.

[0036] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0037] Embodiment 1

[0038] As shown Figures 1 to 12 in the figure, in this embodiment, a deep - sea closable sediment sampler 1 is provided, which includes a sampling bin 5, a bin door 15 and a bin door opening and closing mechanism. The bottom of the sampling bin 5 is open and at least one bin door 15 is movably arranged. The sampling bin 5 is used to be inserted into deep - sea sediments. A bin door opening and closing mechanism is connected to the bin door 15, and the operating rod of the bin door opening and closing mechanism is used to be connected to the manipulator 21. The manipulator 21 drives the operating rod 7 to lift and can realize the opening and closing of the bin door 15.

[0039] As an alternative solution, in this embodiment, the sampling bin 5 includes a tip side plate 19, a rectangular side plate 18 and a top cover 17. The front and back sides of the top cover 17 are respectively fixedly connected to the tip side plates, and the left and right sides are respectively fixedly connected to the rectangular side plates 18. The tip side plate 19 is fixedly connected to the adjacent rectangular side plate 18 to form a bin body with an open bottom. The tip of the tip side plate 19 is located below and protrudes from the length of the rectangular side plate 18. The tip side plate 19 can be directly inserted into deep - sea sediments, facilitating the deep - sea sediment sampling operation.

[0040] As an alternative solution, in this embodiment, between the tip side plate, the rectangular side plate 18 and the top cover 17, and between the tip side plate and the adjacent rectangular side plate 18, they are all fixedly connected by bolts 6 or rivets to form a sealed sampling bin 5.

[0041] As an alternative solution, in this embodiment, U - shaped slides 16 are arranged at the lower ends of two opposite tip side plates of the sampling bin 5. One side of the bin door 15 is respectively slidably arranged in a U - shaped slide 16. When the bin door 15 is open, it is located in the vertical section of the U - shaped slide 16, and when the bin door 15 is closed, it is located in the bottom curved section of the U - shaped slide 16. One end of the bin door 15 is connected to the bin door opening and closing mechanism. In this embodiment, the middle part of the tip side plate is a transparent plate 20, and the transparent plate 20 is inlaid or riveted on the edge frame. The U - shaped slide 16 is arranged on the edge frame, and the transparent plate 20 is convenient for directly observing the sampling situation.

[0042] As an alternative solution, in this embodiment, there are two bin doors 15 which are symmetrically arranged at both ends of the U - shaped slide 16, and the force is evenly distributed during sampling.

[0043] As an alternative solution, in this embodiment, a bin door opening and closing mechanism is arranged at the lower end of the rectangular side plate 18 of the sampling bin 5. The bin door 15 is located inside the rectangular side plate 18. When the bin door 15 is open, the bin door 15 is parallel to the rectangular side plate 18. When the bin door 15 is closed, the end of the bin door 15 fits and seals with the end of the rectangular side plate 18 to form a sealed sampling bin 5, closing the sediment inside the sampler and preventing the sediment sample from flowing out, greatly improving the sampling efficiency of loose sediments.

[0044] As an alternative, in this embodiment, the door opening and closing mechanism of the bin includes a guide rod 13, a slider 12, and a lifting assembly 3. The two ends of the guide rod 13 are respectively connected to the rectangular side plate 18 of the sampling bin 5 through a fixing seat 10. A chute 14 is provided on the rectangular side plate 18. The chute 14 and the guide rod 13 are both vertically and parallelly arranged. The outer end of the slider 12 is slidably arranged on the guide rod 13, and the inner end penetrates through the chute 14 and is fixedly connected to the upper end of the bin door 15. The outer end of the slider 12 is also connected to the lifting assembly 3. The opening and closing of the bin door 15 can be realized by the lifting of the slider 12. The lifting assembly 3 can also be an electric push rod, a pneumatic rod, or a hydraulic rod, and a lifting rod that is convenient for remote control is preferably selected. Among them, the two ends of the guide rod 13 are respectively connected to the rectangular side plate 18 of the sampling bin 5 through a fixing seat 10. A chute 14 is provided on the rectangular side plate 18. The chute 14 and the guide rod 13 are both vertically and parallelly arranged; a guiding hole is formed in the middle of the slider 12. The slider 12 penetrates into the guide rod 13 through the guiding hole. The slider 12 can freely slide along the guide rod 13. A threaded hole is formed in the inner side of the slider 12. While the slider 12 slides along the guide rod 13, it passes through the chute 14 of the rectangular side plate 18. The bin door 15 and the slider 12 are fixed by a pin 24 passing through the bin door 15 and connecting to the inner threaded hole of the slider 12, ensuring that the bin door 15 can slide up and down with the slider 12; a threaded hole is formed in the outer side of the slider 12, and the bottom of the threaded hole communicates with the guiding hole of the slider 12. A locking bolt 6 is screwed into the threaded hole on the outer side of the slider 12. The slider 12 is fixed on the guide rod 13 by the downward pressure of the bolt 6, which facilitates the locking operation of the height of the bin door 15 when releasing the sample. At the same time, the bolt 6 can also press and connect the end of the pull rope 9.

[0045] As an alternative, in this embodiment, a telescopic member 4 is provided between the slider 12 and the upper fixing seat 10. The telescopic member 4 is a compression spring 11. The length of the compression spring 11 is at least the same as the length of the guide rod 13, forming a downward spring pressure, which can pull the slider 12 downward to push the bin door 15 to move along the U-shaped slideway 16, thereby closing and locking the bin door 15, and the bin door 15 cannot be opened without being affected by other external forces. Among them, the length of the compression spring 11 is at least the same as the length of the guide rod 13. The slider 12 can be pushed to the lowest position by the elastic force of the compression spring 11, driving the bin door 15 to close.

[0046] As an alternative, in this embodiment, the lifting assembly 3 includes an operating rod 7, a pulling rope 9, and a support base 2. A support base 2 is provided on the top cover 17 of the sampling bin 5. The lower end of the operating rod 7 penetrates through the top plate of the support base 2. A breakable positioning pin 23 is provided at the lower end of the operating rod 7. The breakable positioning pin 23 is clamped above the top plate of the support base 2. When the breakable positioning pin 23 is not broken, the lower end of the operating rod 7 is inserted into the top cover 17. One end of the pulling rope 9 is movably connected to the lower end of the operating rod 7, and the other end is fixedly connected to the slider 12. When the upper end of the operating rod 7 is lifted by the manipulator 21 and there is a gap between the lower end of the operating rod 7 and the top cover 17, the pulling rope 9 can be disengaged from the lower end of the operating rod 7, and the telescopic member 4 can be reset and extended downward. Among them, the breakable positioning pin 23 can be made of a plastic material or a metal material that can withstand a certain pressure. When the manipulator 21 holds the operating rod 7 and presses it down, when the pressure reaches a certain level, the breakable positioning pin 23 will be broken. When the downward pressure is removed, the operating rod 7 rebounds under the elastic force of the trigger spring 25 and is withdrawn from the hole in the top cover 17 of the sampling bin 5.

[0047] As an alternative, in this embodiment, the operating rod 7 is a T-shaped rod. A fixed positioning pin 22 is further provided at the lower end of the operating rod. The fixed positioning pin 22 is located below the top plate of the support base 2, and the distance between the fixed positioning pin 22 and the breakable positioning pin 23 is greater than the length of the operating rod 7 inserted into the top cover 17.

[0048] As an alternative, in this embodiment, a tapered body is provided at the lower end of the operating rod 7. The lower end of the operating rod 7 is provided with a stepped shaft and a tapered body is provided at the end. A trigger spring 25 is provided between the stepped surface of the stepped shaft and the top plate of the support base 2. The fixed positioning pin 22 is located above the tapered body. A plugging hole is provided on the top cover 17. When the tapered body is inserted into the plugging hole, the fixed positioning pin 22 is located above the top cover 17. Among them, when the operating rod 7 passes through the trigger spring 25 and the lower end passes through the hole in the top plate of the support base 2, when an external force presses down the operating rod 7, the trigger spring 25 is in a compressed state. At the same time, the upper side hole at the lower end of the operating rod and the side hole of the top plate coincide and the breakable positioning pin 23 is inserted, preventing the operating rod 7 from popping out of the support base 2 under the elastic force of the trigger spring 25. A metal material limit pin is installed in the lower side hole of the operating rod 7 to prevent the operating rod 7 from sliding out of the hole in the top plate.

[0049] As an alternative, in this embodiment, a snap ring 8 is provided at one end of the pulling rope 9. The snap ring 8 is movably sleeved on the lower end of the operating rod 7 and is located below the fixed positioning pin 22. The slider 12 is pulled to the top of the guide rod 13 through the pulling rope 9, and the slider 12 drives the bin door 15 to open. The other end of the pulling rope 9 is fixed to the bottom of the operating rod 7 through a pull ring. Since the top tapered end of the operating rod 7 is inserted into the hole in the top cover 17 of the sampling bin 5 before triggering, the pull ring will not slide out of the operating rod 7.

[0050] The deep-sea closable sediment sampler 1 in this embodiment mainly provides a seabed sediment sampling tool for deep-sea vehicles such as deep-sea manned submersibles and remotely operated vehicles (ROVs). It can obtain seabed sediments through single-handed operation by the manipulator 21 and enclose the sediments in the sediment chamber, overcoming the defects of traditional tube-type sediment samplers that are unable to sample low-viscosity loose sediments and the easy loss of sediments after sampling. At the same time, it can be operated with one hand without additional power supply, has high operability, ensures that the deep-sea submersible can efficiently obtain sediment samples, and provides support for the exploration of deep-sea mineral resources.

[0051] Embodiment 2

[0052] As Figures 10 to 12 shown, a method for using the deep-sea closable sediment sampler 1 provided in this embodiment is as follows: Before sampling, the hatch door 15 is located at the upper part of the sampling chamber 5, and the bottom of the sampling chamber 5 is in an open state. The manipulator 21 clamps the operating rod 7 and drives the sampler to insert into the sediment layer. After obtaining the sediment sample, continue to push down the operating rod 7. Since the deep-layer sediment at the bottom is relatively hard, pushing the operating rod 7 cuts the breakable positioning pin 23 through the downward shear force. When the manipulator 21 lifts the sampler during the sampling completion process, under the restoring force of the trigger spring 25, the operating rod 7 will pop out from the hole in the top cover 17 of the sampling chamber 5, thereby releasing the pull ring and the pull rope 9. After the pull rope 9 is released, the slider 12 slides downward under the elastic force of the compression spring 11. Under the elastic force of the compression spring 11, the slider 12 drives the hatch door 15 to slide downward along the U-shaped slideway 16 in the sampling chamber 5, and then the two hatch doors 15 are joined together to close the bottom end of the sampling chamber 5, completing the operation of closing the sediment sampling; the manipulator 21 requires no complex structure and operation steps, and only needs to be pressed down and lifted up.

[0053] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A deep-sea closable sediment sampler, characterized in that: It includes a sampling bin, a bin door, and a bin door opening and closing mechanism. The bottom of the sampling bin is open and at least one bin door is movably arranged. The sampling bin is used to be inserted into deep-sea sediments. The bin door is connected with the bin door opening and closing mechanism. The operating rod of the bin door opening and closing mechanism is used to be connected with a manipulator. The manipulator drives the operating rod to move up and down and can open and close the bin door.

2. The deep-sea closable sediment sampler according to claim 1, characterized in that: The sampling bin includes a tip side plate, a rectangular side plate, and a top cover. The tip side plates are respectively fixedly connected to the front and rear sides of the top cover, and the rectangular side plates are respectively fixedly connected to the left and right sides of the top cover. The tip side plate is fixedly connected to the adjacent rectangular side plate to form a bin body with an open bottom. The tip of the tip side plate is located below and protrudes from the length of the rectangular side plate.

3. The deep-sea closable sediment sampler according to claim 2, wherein: The tip side plate, between the rectangular side plate and the top cover, and between the tip side plate and the adjacent rectangular side plate are all fixedly connected by bolts or rivets.

4. The deep-sea closable sediment sampler according to claim 1, characterized in that: U-shaped chutes are arranged at the lower ends of two opposite tip side plates of the sampling bin. One side of the bin door is respectively slidably arranged in one of the U-shaped chutes. When the bin door is open, it is located in the vertical section of the U-shaped chute. When the bin door is closed, it is located in the bottom bending section of the U-shaped chute. One end of the bin door is connected with the bin door opening and closing mechanism.

5. The deep-sea closable sediment sampler according to claim 4, characterized in that: There are two bin doors and they are symmetrically arranged at both ends of the U-shaped chute.

6. The deep-sea closable sediment sampler according to claim 1, characterized in that: The bin door opening and closing mechanism is arranged at the lower end of the rectangular side plate of the sampling bin. The bin door is located inside the rectangular side plate. When the bin door is open, the bin door is arranged parallel to the rectangular side plate. When the bin door is closed, the end of the bin door fits and seals with the end of the rectangular side plate.

7. The deep-sea closable sediment sampler according to claim 1, characterized in that: The bin door opening and closing mechanism includes a guide rod, a slider, and a lifting component. The two ends of the guide rod are respectively connected to the rectangular side plate of the sampling bin through a fixed seat. A chute is arranged on the rectangular side plate. The chute and the guide rod are both vertical and parallel. The outer end of the slider is slidably arranged on the guide rod, and the inner end penetrates through the chute and is fixedly connected to the upper end of the bin door. The outer end of the slider is also connected with the lifting component.

8. The deep-sea closable sediment sampler according to claim 7, wherein: A telescopic component is arranged between the slider and the upper fixed seat above. The telescopic component is a compression spring, and the length of the compression spring is at least the same as the length of the guide rod.

9. The deep-sea closable sediment sampler according to claim 8, wherein: The lifting component includes an operating rod, a pulling rope, and a support seat. The support seat is arranged on the top cover of the sampling bin. The lower end of the operating rod penetrates through the top plate of the support seat. A breakable positioning pin is arranged at the lower end of the operating rod. The breakable positioning pin is clamped above the top plate of the support seat. When the breakable positioning pin is not broken, the lower end of the operating rod is inserted into the top cover. One end of the pulling rope is movably connected to the lower end of the operating rod, and the other end is fixedly connected to the slider. When the upper end of the operating rod is lifted by the manipulator, after there is a gap between the lower end of the operating rod and the top cover, the pulling rope can be separated from the lower end of the operating rod, and the telescopic component can be reset and extended downward.

10. The deep-sea closable sediment sampler according to claim 9, wherein: The operating lever is a T-shaped lever, and a fixed positioning pin is further provided at the lower end of the operating lever. The fixed positioning pin is located below the top plate of the support seat, and the distance between the fixed positioning pin and the breakable positioning pin is greater than the length of the operating lever inserted into the top cover. A stepped shaft is provided at the lower end of the operating lever, and a tapered body is provided at the end. A trigger spring is provided between the step surface of the stepped shaft and the top plate of the support seat. The fixed positioning pin is located above the tapered body. A plug hole is provided on the top cover. When the tapered body is inserted into the plug hole, the fixed positioning pin is located above the top cover. A snap ring is provided at one end of the pull rope. The snap ring is movably sleeved on the lower end of the operating lever and is located below the fixed positioning pin.

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