Liquid taking detection device of closed-circuit sampler

Abstract

The utility model relates to the technical field of oil liquid detection, in particular to a liquid taking detection device of a closed-circuit sampler, which comprises a connector, a liquid taking cavity, a first interface, a second interface and a liquid taking port are arranged on the connector, the first interface, the second interface and the liquid taking port are communicated with the liquid taking cavity, and valves are arranged at the communicated positions of the first interface, the second interface and the liquid taking port in the liquid taking cavity. The device further comprises a water detector, an ejector pin and a movable driving mechanism, wherein the water detector is detachably connected with one end of the ejector pin; the movable driving mechanism is connected with the connector and seals the liquid taking opening, and the power output end of the movable driving mechanism is connected with the ejector pin; the connector is further provided with a discharging port, and a first sealing cover is arranged at the discharging port. And a blocking part is arranged in the liquid taking cavity. According to the utility model, the defect that the detection result is inaccurate due to the fact that the water detector is easily interfered by the external environment in the prior art is overcome, the oil sampling process is carried out in the closed liquid sampling cavity, the interference of the external environment on the detection result of the water detector can be avoided, and the detection result is more accurate.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil liquid detection technical field more particularly, relate to a kind of liquid taking detection device of closed-circuit sampler. BACKGROUND

[0002] The closed-circuit sampler on the oil truck is used to store oil sample, to facilitate the staff to check whether the oil liquid in the oil storage tank contains impurities, to ensure the quality of oil liquid.For example, the prior art discloses a closed-circuit sampler specially used for aviation oil quality detection, which comprises a base provided with an aviation oil inlet, a glass cylinder, a cover assembly hingedly connected to the upper end of the glass cylinder, a ball valve body detachably connected to the bottom of the base, a handle assembly detachably connected to one side of the base, and a liquid taking assembly arranged on the other side of the base and communicating with the inside of the glass cylinder.The liquid taking assembly comprises a sample detection tube, a sampling channel is formed in the groove bottom of the base, and the sample detection tube is connected to the sampling channel.The sampling channel has an inclined section from the inside of the glass cylinder to the outside of the glass cylinder, so that the aviation oil can flow out smoothly when the sample detection tube is opened.

[0003] In the prior art, the specific steps of sampling and detecting oil liquid are as follows: a chemical water tester is sleeved on the inlet end of a syringe, and then the syringe is pushed to make the chemical water tester abut against the valve, the valve is opened by the chemical water tester applying pressure to the valve, and then the oil liquid in the glass cylinder of the closed-circuit sampler can seep out through the valve.At this time, the oil liquid is sucked by the syringe, so that the oil liquid flows through the chemical water tester and enters the needle cylinder of the syringe.Finally, the water content of the oil liquid is determined according to the reaction of the chemical water tester.

[0004] However, the liquid taking assembly of the above-mentioned prior art is open, and when taking liquid in rainy days or humid environment, the detection result of the water tester is easily disturbed by the external environment, resulting in inaccurate detection result. UTILITY MODEL CONTENT

[0005] In view of the problem that the water tester in the prior art is easily disturbed by the external environment, resulting in inaccurate detection result, the utility model provides a liquid taking detection device of closed-circuit sampler, which can avoid the interference of external environment on the detection result of the water tester.

[0006] To solve the above technical problems, the technical scheme provided by the utility model is as follows:

[0007] The application discloses a liquid taking detection device of a closed-circuit sampler, which comprises a connecting head, a liquid taking cavity, a first interface, a second interface, a liquid taking opening, a valve, a water detector, a thimble and a moving driving mechanism.

[0008] The connecting mode of the thimble and the water detector can be one of adhesion, clamping and insertion; and the moving driving mechanism can be one of a cylinder driving mechanism, a hydraulic cylinder driving mechanism, a gear and rack driving mechanism, a synchronous belt driving mechanism and an electric push rod driving mechanism.

[0009] In the above technical solution, in the use state, the first interface is connected with a pipeline of an oiling system, the second interface is connected with a glass cylinder of the closed-circuit sampler, and the discharge opening is located at the bottom of the connecting head. In the implementation, the moving driving mechanism drives the thimble to move towards the valve, so that the water detector extrudes the valve until the valve is opened, at which time the oil liquid in the glass cylinder of the closed-circuit sampler can seep into the water detector through the valve; then the moving driving mechanism drives the thimble to exit, in the process of which, the water detector moves to abut against the blocking part and is separated from the thimble in the process of continuous exit of the thimble; at this time, the first sealing cover is opened, and the water detector can drop out of the discharge opening under the action of its own gravity, and a worker can judge whether the oil liquid contains water according to the reaction of the water detector.

[0010] Preferably, the application further comprises a storage box, the connecting head is further provided with a feeding opening which is in communication with the liquid taking cavity and is located on the side opposite to the discharge opening, that is, the feeding opening is located at the top of the connecting head in the use state, the storage box is connected to the feeding opening and the inner cavity thereof is in communication with the liquid taking cavity through the feeding opening, the storage box is provided with an openable second sealing cover which is located on the side of the storage box opposite to the feeding opening, and the water detector is provided with a plurality of water detectors which are distributed along the vertical direction and at least part of which is located in the storage box.

[0011] Preferably, the feed port is located between the valve and the discharge port. In this way, the water measuring device needs to move a certain distance after entering the liquid taking cavity from the feed port before reaching the discharge port, so as to avoid the water measuring device from dropping out of the discharge port immediately after entering the liquid taking cavity from the feed port.

[0012] Preferably, the first spring, the first sliding member, the second spring and the second sliding member are further included, and the connecting head is further provided with a first guide cavity and a second guide cavity, both of which are in communication with the liquid taking cavity and have axes coinciding with each other and perpendicular to the axis of the feed port; one end of the first spring is connected to the inner wall of the first guide cavity, and the other end is connected to the first sliding member, the first sliding member has a portion located at least partially in the liquid taking cavity and is provided with a first inclined surface, and the distance between the end of the first inclined surface away from the blocking portion and the axis of the ejector pin is greater than that between the other end of the first inclined surface and the axis of the ejector pin; one end of the second spring is connected to the inner wall of the second guide cavity, and the other end is connected to the second sliding member, the second sliding member has a portion located at least partially in the liquid taking cavity and is provided with a second inclined surface, and the distance between the end of the second inclined surface away from the blocking portion and the axis of the ejector pin is greater than that between the other end of the second inclined surface and the axis of the ejector pin. After the water measuring device enters the liquid taking cavity from the storage box, the first sliding member and the second sliding member can limit the sliding or shaking of the water measuring device in the liquid taking cavity, so that the ejector pin can be quickly connected to the water measuring device after extending into the liquid taking cavity. During the process that the water measuring device gradually exits the liquid taking cavity with the ejector pin, the water measuring device simultaneously abuts against the first inclined surface and the second inclined surface, the first sliding member and the second sliding member slide into the first guide cavity and the second guide cavity respectively, and only until the water measuring device completely separates from the first inclined surface and the second inclined surface, the first sliding member and the second sliding member are reset under the elastic force of the first spring and the second spring respectively.

[0013] Preferably, the opposite sides of the first sealing cover are rotatably connected and buckled connected with the connecting head respectively, and the opposite sides of the second sealing cover are rotatably connected and buckled connected with the storage box respectively. It can be understood that the first sealing cover and the second sealing cover are still connected with the connecting head in the open state, and compared with the opening mode of completely disassembling the first sealing cover and the second sealing cover, the first sealing cover and the second sealing cover can be avoided from being lost.

[0014] Preferably, the movement driving mechanism is a gas cylinder, the cylinder body of the gas cylinder is connected with the connecting head, and the piston rod end of the gas cylinder is connected with one end of the ejector pin. The ejector pin is pushed out or retracted by using the gas cylinder. The structure of the gas cylinder is relatively simple, and the gas cylinder can be used in flammable and explosive environments, and has high safety.

[0015] Preferably, a vacuum pump is further included, a suction cavity is arranged in the ejector pin, and the vacuum pump is communicated with the suction cavity. The vacuum pump can be turned on when the ejector pin is driven to extend by the moving driving mechanism, and the vacuum pump can form negative pressure in the suction cavity, so that the oil exuded by the valve is sucked into the cylindrical shell, and then is sucked from the cylindrical shell into the suction cavity, thereby avoiding the pollution of the internal environment of the liquid taking cavity caused by the oil leaking into the liquid taking cavity.

[0016] Preferably, an oil return tank is further included, and the oil return tank is communicated with the suction cavity through the vacuum pump. The vacuum pump pumps the waste oil in the suction cavity into the oil return tank. The oil return tank is used to collect the waste oil in the suction cavity, so that the subsequent treatment of the waste oil is facilitated.

[0017] Preferably, each water detector includes a cylindrical shell and a water detection diaphragm, the opposite sides of the cylindrical shell are respectively provided with an oil passage and a plug-in interface, the water detection diaphragm is connected to the cylindrical shell on the side where the oil passage is located, and one end of the ejector pin is plugged into the plug-in interface of the cylindrical shell located in the liquid taking cavity. In implementation, the ejector pin is moved to the end thereof to be plugged into the plug-in interface, so that the cylindrical shell is connected to the ejector pin, and then the ejector pin is continuously moved forward to press the valve on the side where the water detection diaphragm is located, so that the valve is opened to allow the oil to exude through the valve. Part of the exuded oil wets the water detection diaphragm, and the other part of the exuded oil passes through the water detection diaphragm and enters the inner cavity of the cylindrical shell through the oil passage. The staff can determine the water content of the oil according to the coloration of the water detection diaphragm.

[0018] Preferably, the end of the ejector pin is provided with a tapered nozzle, the end of the tapered nozzle has a smaller diameter than the outer diameter of the ejector pin, and the tapered nozzle is plugged into the plug-in interface. The tapered nozzle can be quickly positioned to the plug-in interface, and can be more tightly matched with the plug-in interface, so that the shell is not separated from the ejector pin during the movement of the ejector pin.

[0019] The oil sampling process is carried out in the closed liquid taking cavity, so that the detection result of the water detector is not interfered by the external environment, and the detection result is more accurate.

[0020] 1. The oil sampling process is carried out in the closed liquid taking cavity, so that the detection result of the water detector is not interfered by the external environment, and the detection result is more accurate.

[0021] 2. The oil sampling process does not need manual intervention, and the degree of automation is higher.

[0022] 3. The storage box is used to store a plurality of water detectors, and the water detectors in the storage box can fall into the liquid taking cavity under the self-weight after the water detectors in the liquid taking cavity complete sampling, so that the time for manually loading the water detectors is saved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a bottom structure schematic view of a liquid taking and detecting device of a closed circuit sampler.

[0024] Figure 2 is a horizontal sectional view of the connector;

[0025] Figure 3 is a schematic view of the top structure of a liquid sampling detection device of a closed-circuit sampler;

[0026] Figure 4 is a sectional view of the water measuring device;

[0027] Figure 5 is a schematic view of the structure of the needle tip;

[0028] Figure 6 is a longitudinal sectional view of the connector.

[0029] In the drawings: 1 - connector; 101 - liquid sampling cavity; 102 - first interface; 103 - second interface; 104 - liquid sampling port; 105 - discharge port; 106 - blocking part; 107 - feeding port; 108 - first guide cavity; 109 - second guide cavity; 2 - valve; 3 - water measuring device; 301 - cylindrical shell; 302 - water measuring diaphragm; 303 - oil liquid passage; 304 - plug interface; 4 - needle; 401 - suction cavity; 402 - conical nozzle; 5 - moving drive mechanism; 6 - first sealing cover; 7 - storage box; 8 - second sealing cover; 9 - first spring; 10 - first sliding member; 1001 - first inclined surface; 11 - second spring; 12 - second sliding member; 1201 - second inclined surface; 13 - vacuum pump; 14 - oil return tank. DETAILED DESCRIPTION

[0030] The drawings are only used for illustrative description, and cannot be understood as a limitation on the patent; in order to better illustrate the embodiment, some components in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only used for illustrative description, and cannot be understood as a limitation on the patent.

[0031] In the drawings of the embodiments of the utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the utility model, it is understood that if the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "long" and "short" is based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore the terms describing the positional relationship in the drawings are only used for illustrative description, and cannot be understood as a limitation on the patent, and for those skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0032] The technical scheme of the utility model will be further concretely described below in combination with specific embodiments and drawings.

[0033] Embodiment 1

[0034] This embodiment is the first embodiment of the liquid taking detection device of a closed-circuit sampler, which is combined with Figures 1 to 3 As shown in the figure, it comprises a connecting head 1, the connecting head 1 is provided with a liquid taking cavity 101 and a first interface 102, a second interface 103 and a liquid taking port 104 which are all in communication with the liquid taking cavity 101, a valve 2 is arranged at the communication position of the first interface 102, the second interface 103 and the liquid taking port 104 in the liquid taking cavity 101, the valve 2 is a prior art, thus the specific structure thereof will not be described in detail. The device further comprises a water measuring device 3, a thimble 4 and a moving driving mechanism 5, the water measuring device 3 is detachably connected with one end of the thimble 4; the moving driving mechanism 5 is connected with the connecting head 1, the thimble 4 is attached to the liquid taking port 104 and seals the liquid taking port 104; the power output end of the moving driving mechanism 5 is connected with the other end of the thimble 4; the connecting head 1 is further provided with a discharging port 105 which is in communication with the liquid taking cavity 101, the discharging port 105 is provided with an openable first sealing cover 6; a blocking part 106 is arranged in the liquid taking cavity 101, the blocking part 106 is used for blocking the water measuring device 3 at the discharging port 105, so that the water measuring device 3 is separated from the thimble 4 when the thimble 4 exits the liquid taking port 104.

[0035] Further, in combination with Figure 2 and Figure 4 As shown in the figure, the water measuring device 3 all comprises a cylindrical shell 301 and a water measuring diaphragm 302, an oil liquid passage 303 and a plug-in interface 304 are respectively arranged on the opposite sides of the cylindrical shell 301, the water measuring diaphragm 302 is connected with the cylindrical shell 301 on the side where the oil liquid passage 303 is located, and one end of the thimble 4 is plugged into the plug-in interface 304 of the cylindrical shell 301.

[0036] Further, in combination with Figure 2 and Figure 4 As shown in the figure, the end of the thimble 4 is provided with a tapered mouth 402, the end of the tapered mouth 402 has a smaller diameter than the outer diameter of the thimble 4, and the tapered mouth 402 is plugged into the plug-in interface 304. The tapered mouth 402 can be quickly positioned to the plug-in interface 304 and can form a more compact fit with the plug-in interface 304, so as to avoid the shell from being separated from the thimble 4 during the movement of the thimble 4.

[0037] Further, in combination with Figures 1 to 3 As shown in the figure, the moving driving mechanism 5 is a pneumatic cylinder, the cylinder body of the pneumatic cylinder is connected with the connecting head 1 and surrounds the liquid taking port 104, so as to avoid the thimble 4 from being exposed, and the end of the piston rod of the pneumatic cylinder is connected with one end of the thimble 4. The thimble 4 is pushed out or retracted by the pneumatic cylinder. The structure of the pneumatic cylinder is relatively simple and can be used in flammable and explosive environments, thus having high safety.

[0038] Further, as shown in Figure 6 Further, the connecting head 1 is further provided with a feeding port 107 which is in communication with the liquid taking cavity 101, and the feeding port 107 is located at the side opposite to the discharging port 105, that is, the feeding port 107 is located at the top of the connecting head 1 in the use state; the receiving box 7 is connected at the feeding port 107 and the inner cavity thereof is in communication with the liquid taking cavity 101 through the feeding port 107, and the receiving box 7 is provided with an openable second sealing cover 8 at the top; the water detector 3 is provided with a plurality of water detectors and is distributed along the vertical direction, and a part of the water detectors is located in the receiving box 7.

[0039] Further, the opposite sides of the first sealing cover 6 are respectively rotationally connected and buckled connected with the connecting head 1, and the opposite sides of the second sealing cover 8 are respectively rotationally connected and buckled connected with the receiving box 7. It can be understood that the first sealing cover 6 and the second sealing cover 8 are still connected with the connecting head 1 in the open state, and compared with the opening mode of completely disassembling the first sealing cover 6 and the second sealing cover 8, the first sealing cover 6 and the second sealing cover 8 can be avoided from being lost.

[0040] The working principle or working process of the embodiment: in the use state, the first interface 102 is connected with the pipeline of the oil filling system, the second interface 103 is connected with the glass cylinder of the closed-loop sampler, and the feeding port 107 and the discharging port 105 are respectively located at the top and the bottom of the connecting head 1. In the implementation, the moving driving mechanism 5 is used to drive the plunger 4 to move towards the valve 2, the plunger 4 is first moved to be connected with the cylindrical shell 301 of the water detector 3 through the insertion interface 304, then the plunger 4 continues to move with the water detector 3, the valve 2 is opened by using the side of the water detection diaphragm 302 to press the valve 2, and the oil liquid is allowed to seep out through the valve 2. Part of the seeped oil liquid is immersed in the water detection diaphragm 302, and the other part of the seeped oil liquid passes through the water detection diaphragm 302 and enters the inner cavity of the cylindrical shell 301 through the oil liquid passage 303. Then the moving driving mechanism 5 drives the plunger 4 to exit the liquid taking cavity 101, in the process of the plunger 4 exiting the liquid taking cavity 101, the cylindrical shell 301 of the water detector 3 can abut against the blocking part 106 and is separated from the cylindrical shell 301 under the blocking of the blocking part 106, and then is dropped out through the discharging port 105. The worker can judge the water content of the oil liquid according to the color development of the water detection diaphragm 302. It should be noted that the first sealing cover 6 can be opened before the moving driving mechanism 5 is started, or can be opened when the water detector 3 moves to the discharging port 105.

[0041] The beneficial effects of the embodiment are as follows:

[0042] 1. The oil liquid sampling process is carried out in the closed liquid taking cavity, so that the interference of the external environment on the detection result of the water detector can be avoided, and the detection result is more accurate.

[0043] 2. A storage box is provided to store multiple water testers. After the water tester in the sampling chamber has finished sampling, the water tester in the storage box can fall into the sampling chamber under its own weight, saving the time of manually loading the water testers.

[0044] Example 2

[0045] This embodiment is a second embodiment of a liquid sampling and detection device for a closed-circuit sampler. This embodiment is similar to Embodiment 1, except that, as shown in the following... Figure 6 As shown, the inlet 107 is located between valve 2 and outlet 105, meaning the inlet 107 and outlet 105 are offset. This means that after the water meter 3 enters the liquid collection chamber 101 through the inlet 107, it needs to move a certain distance before reaching the outlet 105. This prevents the water meter 3 from immediately falling out of the outlet 105 after entering the liquid collection chamber 101 through the inlet 107.

[0046] Furthermore, combined Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, it also includes a first spring 9, a first sliding member 10, a second spring 11, and a second sliding member 12. The connector 1 is also provided with a first guide cavity 108 and a second guide cavity 109, both of which are connected to the liquid taking cavity 101. The axes of the first guide cavity 108 and the second guide cavity 109 coincide and are both perpendicular to the axis of the feed inlet 107. One end of the first spring 9 is connected to the inner wall of the first guide cavity 108, and the other end is connected to the first sliding member 10. A portion of the first sliding member 10 is located in the liquid taking cavity 101, and a first inclined surface 1001 is provided on this portion. The distance between the end of the first inclined surface 1001 away from the blocking part 106 and the axis of the ejector pin 4 is greater than the other end. One end of the second spring 11 is connected to the inner wall of the second guide cavity 109, and the other end is connected to the second sliding member 12. A portion of the second sliding member 12 is located in the liquid taking cavity 101, and a second inclined surface 1201 is provided on this portion. The distance between the end of the second inclined surface 1201 away from the blocking part 106 and the axis of the ejector pin 4 is greater than the other end. After the water tester 3 enters the liquid collection chamber 101 from the storage box 7, the first sliding member 10 and the second sliding member 12 can restrict the sliding or shaking of the water tester 3 in the liquid collection chamber 101, so that the ejector pin 4 can quickly connect to the water tester 3 after it is inserted into the liquid collection chamber 101. As the water tester 3 gradually withdraws from the liquid collection chamber 101 along with the ejector pin 4, the water tester 3 simultaneously abuts against the first inclined surface 1001 and the second inclined surface 1201. The first sliding member 10 and the second sliding member 12 slide into the first guide cavity 108 and the second guide cavity 109 respectively, until the water tester 3 is completely separated from the first inclined surface 1001 and the second inclined surface 1201. Only then do the first sliding member 10 and the second sliding member 12 return to their original positions under the elastic force of the first spring 9 and the second spring 11 respectively.

[0047] Other features, working principles and beneficial effects of this embodiment are consistent with those of embodiment 1.

[0048] Embodiment 3

[0049] This embodiment is a third embodiment of the liquid taking detection device of the closed-circuit sampler, which is similar to embodiment 2, except that Figure 2 and Figure 3 As shown in Figs. 7 and 8, the vacuum pump 13 is further included, and the suction cavity 401 is arranged in the ejector pin 4, and the vacuum pump 13 is in communication with the suction cavity 401. The moving driving mechanism 5 drives the ejector pin 4 to extend, and at the same time, the vacuum pump 13 is opened. The vacuum pump 13 can form negative pressure in the suction cavity 401, so as to suck the oil leaked from the valve 2 into the cylindrical shell 301, and then into the suction cavity 401 from the cylindrical shell 301. In this way, the oil can be prevented from leaking into the liquid taking cavity 101 and polluting the internal environment of the liquid taking cavity 101.

[0050] Further, the oil return tank 14 is further included, and the oil return tank 14 is in communication with the suction cavity 401 through the vacuum pump 13. The vacuum pump 13 pumps the waste oil in the suction cavity 401 into the oil return tank 14. The oil return tank 14 is used to collect the waste oil in the suction cavity 401, so as to facilitate subsequent treatment of the waste oil.

[0051] Other features, working principles and beneficial effects of this embodiment are consistent with those of embodiment 2.

[0052] In the specific contents of the above specific embodiments, any non-contradictory combination of technical features can be made, and in order to make the description simple, all possible combinations of the above technical features are not described, however, as long as the combination of the technical features does not exist, it should be considered as the scope of the description.

[0053] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description, and here, all the embodiments are not enumerated. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model claims.

Claims

1. A liquid sampling detection device of a closed-circuit sampler, comprising a connecting head (1), wherein a liquid sampling cavity (101) and a first interface (102), a second interface (103) and a liquid sampling port (104) in communication with the liquid sampling cavity (101) are arranged on the connecting head (1), and a valve (2) is arranged at the communication positions of the first interface (102), the second interface (103) and the liquid sampling port (104) in the liquid sampling cavity (101), characterized in that, Further comprising a water detector (3), a thimble (4) and a moving driving mechanism (5), the water detector (3) is detachably connected with one end of the thimble (4); the moving driving mechanism (5) is connected with the connecting head (1), the thimble (4) is attached to and closes the liquid taking opening (104), or part of the moving driving mechanism (5) closes the liquid taking opening (104); the power output end of the moving driving mechanism (5) is connected with the thimble (4) and is used for driving the thimble (4) to move so that the water detector (3) extrudes the valve (2) to open; the connecting head (1) is further provided with a discharge port (105) in communication with the liquid taking cavity (101), the discharge port (105) is provided with an openable first sealing cover (6); the liquid taking cavity (101) is provided with a blocking part (106), the blocking part (106) is used for blocking the water detector (3) at the discharge port (105), so that the water detector (3) is separated from the thimble (4) when the thimble (4) exits the liquid taking opening (104).

2. A liquid pick-up detection device for a closed-circuit sampler according to claim 1, characterised in that, The connecting head (1) is further provided with a feeding port (107) in communication with the liquid taking cavity (101), the feeding port (107) is located on the side opposite to the discharge port (105), a receiving box (7) is connected at the feeding port (107) and the inner cavity thereof is in communication with the liquid taking cavity (101) through the feeding port (107), the receiving box (7) is provided with an openable second sealing cover (8) located on the side opposite to the feeding port (107); the water detector (3) is provided with a plurality of and is distributed along the vertical direction, at least part of which is located in the receiving box (7).

3. A liquid pick-up detection device for a closed-circuit sampler according to claim 2, characterised in that, The feeding port (107) is located between the valve (2) and the discharge port (105).

4. A liquid pick-up detection device for a closed-circuit sampler according to claim 3, characterised in that, Further comprising a first spring (9), a first sliding piece (10), a second spring (11) and a second sliding piece (12), the connector (1) is further provided with a first guide cavity (108) and a second guide cavity (109) which are both in communication with the liquid taking cavity (101), the axes of the first guide cavity (108) and the second guide cavity (109) coincide and are both perpendicular to the axis of the feed port (107); one end of the first spring (9) is connected to the inner wall of the first guide cavity (108), the other end is connected to the first sliding piece (10), the first sliding piece (10) has at least a part located in the liquid taking cavity (101) and is provided with a first inclined surface (1001) on the part, the distance between the end of the first inclined surface (1001) far away from the blocking part (106) and the axis of the ejector pin (4) is greater than the other end; one end of the second spring (11) is connected to the inner wall of the second guide cavity (109), the other end is connected to the second sliding piece (12), the second sliding piece (12) has at least a part located in the liquid taking cavity (101) and is provided with a second inclined surface (1201) on the part, the distance between the end of the second inclined surface (1201) far away from the blocking part (106) and the axis of the ejector pin (4) is greater than the other end.

5. A liquid pick-up detection device for a closed-circuit sampler according to claim 2, characterised in that, The opposite sides of the first sealing cover (6) are rotatably connected and buckled connected with the connector (1) respectively, and the opposite sides of the second sealing cover (8) are rotatably connected and buckled connected with the storage box (7) respectively.

6. A liquid pick-up detection device for a closed-circuit sampler according to claim 1, characterised in that, The moving drive mechanism (5) is a gas cylinder, the cylinder body of the gas cylinder is connected with the connector (1), and the piston rod end of the gas cylinder is connected with one end of the ejector pin (4).

7. A liquid pick-up detection device for a closed-circuit sampler according to claim 1, characterised in that, Further comprising a vacuum pump (13), the ejector pin (4) is provided with a suction cavity (401), and the vacuum pump (13) is in communication with the suction cavity (401).

8. A liquid pick-up detection device for a closed-circuit sampler according to claim 7, characterised in that, Further comprising an oil return tank (14), the oil return tank (14) is in communication with the suction cavity (401) through the vacuum pump (13).

9. A liquid pick-up detection device for a closed-circuit sampler according to any one of claims 1 to 8, characterised in that, The water measuring device (3) comprises a cylindrical shell (301) and a water measuring diaphragm (302), oil liquid passages (303) and plug-in interfaces (304) are respectively arranged on the opposite sides of the cylindrical shell (301), the water measuring diaphragm (302) is connected with the cylindrical shell (301) on the side where the oil liquid passage (303) is located, and one end of the ejector pin (4) is plugged into the plug-in interface (304) of the cylindrical shell (301) located in the liquid taking cavity (101).

10. A liquid pick-up detection device for a closed-circuit sampler according to claim 9, characterised in that, The end of the ejector pin (4) is provided with a tapered nozzle (402), the end of the tapered nozzle (402) has a smaller diameter than the outer diameter of the ejector pin (4), and the tapered nozzle (402) is plugged into the plug-in interface (304).

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