A turbulence-resistant water body sampling device

Abstract

The utility model discloses a kind of anti-interference water body sampling equipment, belong to water body sampling field, including the straight pipe with double open end, the open end is located at the pipe body both ends of straight pipe, wherein the open end side at the bottom of straight pipe is provided with closure mechanism, the closure mechanism includes the trigger lever same with the setting direction of the straight pipe and the closure plate being stopped by the trigger lever, slidingly arranged with moving plug in the inner wall of the straight pipe, the top end of the moving plug is detachably connected with pull mechanism, the pull mechanism includes the pull rod movably connected with the top end of the moving plug, the utility model cooperates with trigger lever by stopping part, so that straight pipe can be sealed to the bottom end of straight pipe in water after completing water body sampling to specific water layer, to avoid the process that straight pipe is transferred from sampling area to water surface, and the phenomenon of turbulence mixing occurs with external water body.

Description

Technical Field

[0001] This utility model relates to the field of water sampling technology, and more specifically, to a water sampling device that resists turbulent flow. Background Technology

[0002] Water sampling is a fundamental step in obtaining water environment data. Depending on the monitoring purpose, such as water quality analysis or pollutant detection, a certain volume of water sample should be collected from a representative water body using a sampler, in accordance with the specifications. The collected water sample must be ensured to be uncontaminated so as to accurately reflect the water body condition and provide a reliable sample for subsequent laboratory analysis.

[0003] A search revealed Chinese patent CN217331707U, which discloses a rod-type water sampler, including a sampling cylinder with a fixing component inside and a holding component installed on the fixing component; a drain pipe is provided at the bottom of the sampling cylinder, and the bottom surface of a sealing plate is pressed tightly against the top of the drain pipe to seal the opening of the drain pipe; a pull rod is coaxially installed inside the sampling cylinder, and the lower end of the pull rod is fixed to the sealing plate.

[0004] In the aforementioned patent, after the device completes water quality sampling, during the process of taking it from the sampling area to the water surface, due to the lack of immediate sealing measures, as the device rises in the water, the water sample in the sampling chamber will be disturbed and mixed with water at different depths, resulting in the collected water sample failing to accurately reflect the water characteristics of the target sampling point.

[0005] Therefore, in order to solve the above problems, we propose a water sampling device that is resistant to disturbance. Utility Model Content

[0006] To address the problems mentioned in the background section, this utility model provides the following technical solution:

[0007] An anti-turbulence water sampling device includes a straight suction tube with two open ends, the open ends being located at both ends of the tube body. A closing mechanism is provided on one side of the open end at the bottom of the straight suction tube. The closing mechanism includes a trigger rod extending in the same direction as the straight suction tube and a closing plate stopped and limited by the trigger rod. A movable plug is slidably disposed on the inner wall of the straight suction tube. A lifting mechanism is detachably connected to the top of the movable plug. The lifting mechanism includes a pull rod movably connected to the top of the movable plug. When the pull rod moves the movable plug to a preset position, it can push the trigger rod to disengage from the closing plate, and the closed plate, having been released from its limitation, then closes the open end at the bottom of the straight suction tube.

[0008] Furthermore, the trigger rod is located outside the tube body of the straight suction tube, and the axis of the trigger rod is parallel to the axis of the straight suction tube.

[0009] Furthermore, multiple sets of limiting seats are fixed to the outer wall of the straight suction tube, and each set of limiting seats is distributed sequentially along the outer wall of the straight suction tube. The trigger rod is slidably connected to the limiting seats, and a first elastic element is provided between two adjacent sets of limiting seats to allow the trigger rod to spring back and reset.

[0010] Furthermore, a limiting ring is fixedly connected on the outer wall of the trigger rod between two adjacent sets of limiting seats, and the two ends of the first elastic element are respectively located between the limiting ring and the limiting seat on the side away from the limiting ring.

[0011] Furthermore, a stop is fixedly connected to the bottom end of the pull rod, and the top end of the trigger rod is L-shaped, with its end extending toward the center of the straight suction tube. Through the stop and the stop limiting the top end of the trigger rod, the pull rod can drive the trigger rod to move synchronously.

[0012] Furthermore, the top of the movable plug is provided with a first connector, and the bottom of the pull rod is provided with a second connector that engages with the first connector.

[0013] Furthermore, the first connector has a side wall fixedly connected to the top of the movable plug and a top wall extending around the side wall. The surface of the top wall is provided with a slot. After the second connector is inserted into the slot, it rotates relative to the axis of the pull rod to achieve axial engagement and limiting between the second connector and the first connector.

[0014] Furthermore, the closing mechanism also includes a connecting plate fixed to the bottom end of the straight suction tube. The surface of the connecting plate is provided with a through groove. The closing plate is slidably disposed on one side of the through groove. The other side of the through groove corresponds to the open end of the bottom end of the straight suction tube. A second elastic element is provided between the closing plate and the connecting plate. An insertion hole is provided at the top of the closing plate. The bottom end of the trigger rod is inserted into the insertion hole.

[0015] Furthermore, an auxiliary limiting mechanism is provided between the pull rod and the straight suction tube to keep the pull rod in axial linear displacement. The auxiliary limiting mechanism includes a guide rod arranged parallel to the pull rod, and the guide rod is distributed with multiple sets of guide seats along the axial direction. The pull rod is slidably connected to the guide seats.

[0016] Furthermore, a first engaging component is fixedly connected to the side wall of the straight suction tube, and the bottom end of the guide rod is inserted into the first engaging component. Two sets of limiting pins are slidably extended and retracted on both sides of the first engaging component. The limiting pins are inserted into the connecting ring at the bottom end of the guide rod. A sliding plate is fixedly connected to one end of the limiting pin located inside the first engaging component. A sliding rod is slidably connected to the sliding plate. Both ends of the sliding rod are fixedly connected to the first engaging component. An elastic reset component is provided between the two sets of sliding plates. A pressing rod is fixedly connected to one end of the two sets of sliding plates that is away from each other and parallel to the axial direction of the sliding rod. The two sets of pressing rods extend out of the first engaging component.

[0017] In summary, this utility model has the following beneficial effects:

[0018] I. This utility model, through the coordinated cooperation of the stop and the trigger rod, enables the bottom of the direct suction tube to be sealed in the water after sampling a specific water layer. This avoids the direct suction tube from being disturbed and mixed with the external water during the process of transferring from the sampling area to the water surface, thereby ensuring that the final sample can accurately reflect the water quality of the sampling area and guaranteeing the accuracy of the final experimental analysis results.

[0019] Second, by replacing the suction rod and guide rod with different lengths, and through the limiting cooperation between the two, the direct suction tube can reach the corresponding sampling depth, thereby meeting the sampling requirements of water bodies at different depths and fully improving the adaptability of the equipment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a three-dimensional schematic diagram of the closing mechanism of this utility model;

[0023] Figure 3 This is a three-dimensional schematic diagram of the lifting mechanism of this utility model;

[0024] Figure 4 This is a perspective view of the first and second connecting members of this utility model;

[0025] Figure 5 This is an assembly diagram of the first and second connecting parts of this utility model;

[0026] Figure 6 This is a three-dimensional schematic diagram of the connecting plate and the closing plate of this utility model;

[0027] Figure 7 This is a three-dimensional schematic diagram of the internal structure of the first engaging component of this utility model.

[0028] In the picture:

[0029] 1. Straight suction tube; 2. Auxiliary limiting mechanism; 201. Guide rod; 202. First engaging component; 203. Limiting pin; 204. Slide plate; 205. Slide rod; 206. Extrusion rod; 207. Elastic reset component; 3. Lifting mechanism; 301. Pull rod; 302. Stop component; 303. Second connecting component; 304. First connecting component; 4. Closing mechanism; 401. Trigger rod; 402. Limiting seat; 403. First elastic element; 404. Limiting ring; 405. Connecting plate; 406. Closing plate; 407. Second elastic element; 5. Moving plug. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0031] The present invention will be further described below with reference to the embodiments.

[0032] Please see the appendix Figure 1-7 An anti-turbulence water sampling device includes a straight suction tube 1 with two open ends. The straight suction tube 1 is a hollow cylinder, which can be made of transparent material to facilitate operators to directly observe the water sample inside the tube from the outside. The outer wall of the straight suction tube 1 can be provided with corresponding water volume scale lines in the vertical direction. The open ends are located at both ends of the tube body of the straight suction tube 1. The top of the straight suction tube 1 is open-mouthed, and its outer side is provided with external threads that fit the side wall. A fastening cap with matching internal threads can be used to seal and fix the top of the straight suction tube 1, so that the water sample inside the tube will not overflow during subsequent transportation.

[0033] The bottom of the straight suction tube 1 has an annular bottom wall, and a through hole is formed in the middle of the annular bottom wall to connect the inside of the tube body of the straight suction tube 1. A closing mechanism 4 is provided on one side of the open end of the bottom of the straight suction tube 1. The closing mechanism 4 includes a trigger rod 401 in the same extension direction as the straight suction tube 1 and a closing plate 406 that is stopped and limited by the trigger rod 401. The trigger rod 401 is located on the outside of the tube body of the straight suction tube 1, and the axis of the trigger rod 401 is parallel to the axis of the straight suction tube 1. An insertion hole is opened at the top of the closing plate 406, and the bottom end of the trigger rod 401 is inserted into the insertion hole. In the initial state of the device, the trigger rod 401 stops and limits the closing plate 406, so that the open end of the bottom of the straight suction tube 1 is in an open state.

[0034] A movable plug 5 is slidably installed on the inner wall of the direct suction tube 1. The movable plug 5 is designed as a cylinder that fits the inner wall of the direct suction tube 1. The side wall of the movable plug 5 is provided with a sealing ring to ensure airtightness and prevent liquid from leaking from the gap between the movable plug 5 and the tube wall of the direct suction tube 1. As the movable plug 5 moves from the bottom to the top of the direct suction tube 1, a negative pressure is formed inside the direct suction tube 1, and the water body is drawn into the direct suction tube 1, thereby completing the quantitative extraction of water sample.

[0035] The top of the movable plug 5 is detachably connected to a lifting mechanism 3. The lifting mechanism 3 includes a pull rod 301 that is movably connected to the top of the movable plug 5. When the pull rod 301 moves the movable plug 5 to a preset position at the top of the direct suction tube 1, the direct suction tube 1 has completed the extraction of water sample. Then, the pull rod 301 is slowly pulled upward. Through the stoppers 302 at both ends of the pull rod 301, the trigger rod 401 is pushed to disengage from the closing plate 406. At this time, the closed plate 406, which has been released from its limit, quickly closes the open end at the bottom of the direct suction tube 1. Thus, the water sample in the direct suction tube 1 is sealed inside the tube, thereby avoiding turbulence and mixing of the water sample with water of different depths during the process of the device being taken out of the water body, ensuring the accuracy and representativeness of the water sample.

[0036] Multiple sets of limiting seats 402 are fixed to the outer wall of the straight suction tube 1. Each set of limiting seats 402 extends radially along the straight suction tube 1 and is distributed sequentially along the axial direction of the straight suction tube 1. A straight protrusion is provided on the outer wall of the trigger rod 401 along the axial direction. A groove corresponding to the protrusion is provided in the limiting seat 402. Through the limiting cooperation between the protrusion and the groove, the trigger rod 401 does not deflect around its own axis during the sliding process along the limiting seat 402.

[0037] A first elastic element 403 is provided between two adjacent sets of limiting seats 402 to cause the trigger rod 401 to spring back and reset. The downward pressure provided by the first elastic element 403 ensures that the bottom end of the trigger rod 401 is always inserted into the insertion hole at the top of the closing plate 406 when no external force is applied.

[0038] A limiting ring 404 is fixedly connected on the outer wall of the trigger rod 401 between two adjacent sets of limiting seats 402. The two ends of the first elastic element 403 are respectively located between the limiting ring 404 and the limiting seat 402 on the side away from the limiting ring 404. The first elastic element 403 can be a spring, and the diameter of the limiting ring 404 is larger than the outer diameter of the spring.

[0039] The stopper 302 is fixedly connected to both sides of the bottom end of the pull rod 301. The stopper 302 is preferably two fan-shaped panels symmetrically distributed with the axis of the pull rod 301 as the center line. The top of the trigger rod 401 is L-shaped, and its end extends toward the center of the straight suction tube 1. The two fan-shaped panels are symmetrically distributed around the bottom end of the pull rod 301 to form the protruding end and the hollow end of the bottom end of the pull rod 301. When the bottom end of the pull rod 301 is to be inserted into the straight suction tube 1, its hollow end faces the L-shaped end of the trigger rod 401. To avoid mutual obstruction, when the pull rod 301 rises, the rotation angle makes the protruding end face the L-shaped end of the trigger rod 401. Thus, through the stop member 302 and the stop limit at the top of the trigger rod 401, when the pull rod 301 is moving upward, after the stop member 302 contacts the trigger rod 401, it can immediately drive the trigger rod 401 to move upward synchronously, so that the bottom of the trigger rod 401 disengages from the closing plate 406, releasing the control limit on the closing plate 406.

[0040] The top of the movable plug 5 is provided with a first connector 304, and the bottom of the pull rod 301 is provided with a second connector 303 that engages with the first connector 304. The second connector 303 and the first connector 304 are axially limited and fixed, so that the pull rod 301 can drive the movable plug 5 to move synchronously during the upward process.

[0041] The first connector 304 has a side wall fixedly connected to the top of the movable plug 5 and a top wall extending around the side wall. The enclosing of the side wall and the top wall forms a cavity inside the first connector 304. A slot is provided on the surface of the top wall. The shape of the slot is the same as the bottom cross-section of the second connector 303, so that the second connector 303 can enter the cavity inside the first connector 304 through the slot. The second connector 303 preferably has protrusions at both ends that extend radially along the pull rod 301. After the second connector 303 is inserted into the slot, it rotates relative to the axis of the pull rod 301, so that the protrusions at both ends and the top wall of the first connector 304 form a mutually blocking limiting relationship. Through the axial engagement and limiting of the second connector 303 and the first connector 304, the pull rod 301 can drive the movable plug 5 to achieve synchronous movement.

[0042] The closing mechanism 4 also includes a connecting plate 405 fixed to the bottom of the direct suction pipe 1. The surface of the connecting plate 405 is provided with a through groove, and straight protrusions are formed on the side walls on both sides of the through groove. Straight sliding grooves are formed on the side walls of the closing plate 406. The closing plate 406 is slidably set in the through groove through the limiting relationship between the straight sliding grooves on both sides and the straight protrusions on both sides of the through groove. In the initial state, the closing plate 406 is located on one side of the through groove. At this time, the other side of the through groove corresponds to the open end of the bottom of the direct suction pipe 1. The closing plate 406 is away from the open end of the bottom of the direct suction pipe 1. When the water sampling is completed, the closing plate 406 moves to the bottom of the open end, thereby forming an effective barrier to seal the internal space of the direct suction pipe 1. Finally, the water sample in the direct suction pipe 1 is isolated from the external water body, thereby avoiding the water sample from being disturbed and mixed with water of different depths during the process of the equipment taking out the water body, and ensuring that the water sample accurately represents the water characteristics of the target sampling point.

[0043] A second elastic element 407 is provided between the closing plate 406 and the connecting plate 405. The second elastic element 407 can be a spring. The elastic force provided by the compressed spring allows the closing plate 406 to close quickly. The top of the closing plate 406 has an insertion hole, and the bottom end of the trigger rod 401 is inserted into the insertion hole. The locking engagement between the trigger rod 401 and the insertion hole allows the closing plate 406 to be located on one side of the connecting plate 405 in the initial state.

[0044] An auxiliary limiting mechanism 2 is provided between the pull rod 301 and the straight suction tube 1 to keep the pull rod 301 in a linear axial displacement. The auxiliary limiting mechanism 2 includes a guide rod 201 arranged parallel to the pull rod 301, and multiple sets of guide seats are distributed along the axial direction of the guide rod 201. The pull rod 301 is slidably connected to the guide seats. Through the limiting effect of the multiple sets of guide seats, the pull rod 301 can move stably in a linear axial direction during the lifting process, avoiding the pull rod 301 from shaking or deviating, thereby ensuring the smooth sliding of the moving plug 5 in the straight suction tube 1.

[0045] The side wall of the direct suction tube 1 is fixedly connected to a first locking component 202. The bottom end of the guide rod 201 is inserted into the first locking component 202. Two sets of limiting pins 203 slide and extend on both sides of the first locking component 202. The limiting pins 203 are inserted into the connecting ring at the bottom end of the guide rod 201. Through the detachable and flexible connection between the guide rod 201 and the direct suction tube 1, the disassembly and assembly of the equipment are convenient. At the same time, a set of auxiliary limiting mechanisms 2 and a set of lifting mechanisms 3 can be adapted to multiple sets of direct suction tubes 1. The detachable structural design also allows the operator to replace the guide rod 201 and the pull rod 301 of different lengths according to the change of sampling depth, so as to meet the sampling needs of the equipment for water bodies at different depths.

[0046] One end of the limiting pin 203 located inside the first locking member 202 is fixedly connected to a slide plate 204. The slide plate 204 is slidably connected to a slide rod 205. Both ends of the slide rod 205 are fixedly connected to the first locking member 202. An elastic reset member 207 is provided between the two sets of slide plates 204. The elastic reset member 207 can be a spring. The ends of the two sets of slide plates 204 that are far apart from each other are fixedly connected to a pressing rod 206 parallel to the axial direction of the slide rod 205. One end of the pressing rod 206 is connected to a button. The two sets of pressing rods 206 extend out of the first locking member 202 respectively. The two sets of pressing rods 206 are slidably connected to the side wall of the first locking member 202 respectively. At the same time, the pressing rods 206 on both sides are pushed to move into the first locking member 202, so that the slide plate 204 drives the limiting pin 203 to retract into the first locking member 202, thereby causing the limiting pin 203 to disengage from the connecting ring at the bottom of the guide rod 201.

[0047] Working principle: First, unscrew the fastening cap at the top of the direct suction tube 1. Then, place the movable plug 5 at the top opening of the direct suction tube 1. Connect the bottom end of the guide rod 201 to the first engaging part 202 on one side of the direct suction tube 1. At the same time, connect the second connecting part 303 at the bottom of the pull rod 301 to the first connecting part 304 at the top of the movable plug 5. At this time, push the movable plug 5 to the bottom of the direct suction tube 1 through the pull rod 301. During use, the appropriate length of the pull rod 301 and guide rod 201 can be selected according to the depth of the sampled water layer. After the direct suction tube 1 reaches the predetermined depth, rotate the pull rod 301 90 degrees, and then push it towards the bottom of the direct suction tube 1. Pull up the lever 301. When the lever 301 moves the movable plug 5 to the preset position at the top, the lever 301 drives the trigger lever 401 to move synchronously through the stoppers 302 at both ends. This causes the bottom of the trigger lever 401 to disengage from the closing plate 406. After the closing plate 406 is released from its limit, it quickly closes the bottom of the straight suction tube 1. At this time, the straight suction tube 1 can be taken out of the water as a whole. Then, by pressing the squeezing rod 206 and rotating the lever 301 90 degrees in the opposite direction, the guide rod 201 and the lever 301 are separated from the straight suction tube 1 and the movable plug 5, respectively. Finally, tighten the fastening cap on the top of the straight suction tube 1.

[0048] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are only illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope of this utility model, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A water sampling device resistant to turbulent flow, comprising a straight suction pipe (1) with two open ends, characterized in that, The open ends are located at both ends of the tube body of the straight suction tube (1). A closing mechanism (4) is provided on one side of the open end at the bottom of the straight suction tube (1). The closing mechanism (4) includes a trigger rod (401) extending in the same direction as the straight suction tube (1) and a closing plate (406) blocked and limited by the trigger rod (401). A movable plug (5) is slidably provided on the inner wall of the straight suction tube (1). A lifting mechanism (3) is detachably connected to the top of the movable plug (5). The lifting mechanism (3) includes a pull rod (301) movably connected to the top of the movable plug (5). When the pull rod (301) moves the movable plug (5) to a preset position, it can push the trigger rod (401) to disengage from the closing plate (406). The closed plate (406) that has been released from its limitation then closes the open end at the bottom of the straight suction tube (1).

2. The anti-turbulence water sampling device according to claim 1, characterized in that, The trigger rod (401) is located outside the tube body of the straight suction tube (1), and the axis of the trigger rod (401) is parallel to the axis of the straight suction tube (1).

3. The anti-turbulence water sampling device according to claim 2, characterized in that, Multiple sets of limiting seats (402) are fixed to the outer wall of the straight suction tube (1). Each set of limiting seats (402) is distributed sequentially along the outer wall of the straight suction tube (1). The trigger rod (401) is slidably connected to the limiting seat (402). A first elastic element (403) is provided between two adjacent sets of limiting seats (402) to cause the trigger rod (401) to spring back and reset.

4. The anti-turbulence water sampling device according to claim 3, characterized in that, A limiting ring (404) is fixedly connected on the outer wall of the trigger rod (401) between two adjacent sets of limiting seats (402). The two ends of the first elastic element (403) are respectively located between the limiting ring (404) and the limiting seat (402) on the side away from the limiting ring (404).

5. The anti-disturbance water sampling device according to claim 1, characterized in that, The bottom end of the pull rod (301) is fixedly connected to a stop (302), and the top end of the trigger rod (401) is L-shaped, with its end extending toward the center of the straight suction tube (1). Through the stop (302) and the stop limit of the top end of the trigger rod (401), the pull rod (301) can drive the trigger rod (401) to move synchronously.

6. The anti-disturbance water sampling device according to claim 1, characterized in that, The top of the movable plug (5) is provided with a first connector (304), and the bottom of the pull rod (301) is provided with a second connector (303) that engages with the first connector (304).

7. The anti-disturbance water sampling device according to claim 6, characterized in that, The first connector (304) has a side wall fixedly connected to the top of the movable plug (5) and a top wall extending around the side wall. The surface of the top wall is provided with a slot. After the second connector (303) is inserted into the slot, it rotates relative to the axis of the pull rod (301) to achieve axial engagement and limiting between the second connector (303) and the first connector (304).

8. The anti-disturbance water sampling device according to claim 1, characterized in that, The closing mechanism (4) further includes a connecting plate (405) fixed to the bottom end of the straight suction tube (1). The surface of the connecting plate (405) is provided with a through groove. The closing plate (406) is slidably disposed on one side of the through groove. The other side of the through groove corresponds to the open end of the bottom end of the straight suction tube (1). A second elastic element (407) is provided between the closing plate (406) and the connecting plate (405). The top end of the closing plate (406) is provided with an insertion hole. The bottom end of the trigger rod (401) is inserted into the insertion hole.

9. The anti-disturbance water sampling device according to claim 1, characterized in that, An auxiliary limiting mechanism (2) is provided between the pull rod (301) and the straight suction tube (1) to keep the pull rod (301) in a linear displacement along the axial direction. The auxiliary limiting mechanism (2) includes a guide rod (201) arranged parallel to the pull rod (301). The guide rod (201) has multiple sets of guide seats distributed along the axial direction. The pull rod (301) is slidably connected to the guide seats.

10. The anti-disturbance water sampling device according to claim 9, characterized in that, The straight suction tube (1) is fixedly connected to a first engaging member (202) on its side wall. The bottom end of the guide rod (201) is inserted into the first engaging member (202). Two sets of limiting pins (203) slide and extend on both sides of the first engaging member (202). The limiting pins (203) are inserted into the connecting ring at the bottom end of the guide rod (201). One end of the limiting pin (203) located in the first engaging member (202) is fixedly connected to a sliding plate (204). The sliding plate (204) is slidably connected to a sliding rod (205). Both ends of the sliding rod (205) are fixedly connected to the first engaging member (202). An elastic reset member (207) is provided between the two sets of sliding plates (204). The two sets of sliding plates (204) are fixedly connected to a pressing rod (206) parallel to the axial direction of the sliding rod (205) at one end away from each other. The two sets of pressing rods (206) extend out of the first engaging member (202).

Images