Pipeline sampling device

Abstract

The present invention relates to the technical field of sampling detection, and discloses a pipeline sampling device, comprising a main pipeline and a secondary pipeline, wherein a sampling mechanism is arranged on the main pipeline, wherein the sampling mechanism comprises a sampling valve core, wherein a piston is movably inserted inside the sampling valve core, and wherein the sampling mechanism controls the opening state of the sampling valve core through the piston; wherein a accommodating mechanism is also arranged on the main pipeline, wherein the accommodating mechanism comprises a supporting member, wherein one end of the supporting member is fixedly mounted on the outside of the main pipeline, wherein an accommodating cavity is provided inside the supporting member, wherein a connecting component is arranged between the accommodating cavity and the sampling valve core, and wherein the connecting component is used for connecting the accommodating cavity with the space above the sampling valve core; wherein the present invention samples the fluid in the main pipeline by arranging the sampling valve core, and the operation is convenient and quick, and when the sampling valve core is damaged, the fluid can be collected through the accommodating cavity, thereby avoiding fluid leakage and triggering an alarm.

Description

Technical Field

[0001] The invention belongs to the technical field of sampling and detection, and in particular relates to a pipeline sampling device. Background Art

[0002] In the production process of petrochemical plants, accurate and timely collection of fluid samples in the pipelines of the plants is crucial, as it is directly related to the monitoring of the production process, product quality and safe production.

[0003] A Chinese patent application with authorization announcement number CN219434433U discloses a product detection sampling device for a chemical park, comprising a fixed tube, a material guide tube being fixedly connected to the inner wall of the fixed tube, a sampling fixing seat being fixedly connected to the upper end of the material guide tube, a rotatable mounting hole being provided on the side surface of the sampling fixing seat, and a sampling ball core being rotatably mounted inside the rotatable mounting hole, a ball head structure of the sampling ball core being located inside the sampling fixing seat, a sampling cavity being provided on the upper side surface of the ball head structure of the sampling ball core, a sampling hole being provided on the side surface of the sampling fixing seat, and an axial direction of the sampling hole being perpendicular to the axial direction of the material guide tube.

[0004] However, this technical solution still has at least the following defects: although the above solution can effectively reduce the possibility of leakage of the object transported in the pipeline, it cannot provide an emergency protection measure for the fluid eruption caused by the damage of the sampling ball core, and it is inconvenient to operate during the later maintenance, and the liquid in the pipeline needs to be stopped before disassembly, which is easy to delay the project. In view of this, the present invention is specially proposed. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a pipeline sampling device, which samples the fluid in the main pipeline by setting a sampling valve core. The operation is convenient and quick, and when the sampling valve core is damaged, the fluid can be collected through the accommodating cavity, avoiding fluid leakage and triggering an alarm.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] A pipeline sampling device comprises a main pipeline and a secondary pipeline, wherein the main pipeline is provided with a sampling mechanism, wherein the sampling mechanism comprises a sampling valve core, wherein a piston is movably inserted inside the sampling valve core, and wherein the sampling mechanism controls the opening state of the sampling valve core through the piston;

[0008] The main pipeline is also provided with a receiving mechanism, the receiving mechanism includes a support member, one end of the support member is fixedly mounted on the outside of the main pipeline, a receiving cavity is provided inside the support member, a connecting component is provided between the receiving cavity and the sampling valve core, and the connecting component is used to connect the receiving cavity with the space above the sampling valve core;

[0009] A control mechanism is arranged on the top of the support member. The control mechanism comprises a clamping plate and an upper pad. The control mechanism controls the unlocking state of the sampling mechanism through the friction force between the clamping plate and the upper pad.

[0010] As a preferred embodiment of the present invention, an elastic reset assembly is provided on the top of the sampling mechanism, a first plug rod is installed at the bottom of the elastic reset assembly, the bottom of the first plug rod movably penetrates the sampling valve core and extends to the bottom of the sampling valve core, a sealing plate is fixedly installed at the bottom of the first plug rod, the top of the sealing plate is fixedly connected to the bottom of the piston, and the elastic reset assembly is used to reset the piston until it maintains a sealing state with the sampling valve core.

[0011] As a preferred embodiment of the present invention, the elastic reset assembly includes a sealing gasket, a second plug rod is fixedly installed on the bottom of the sealing gasket, the bottom of the second plug rod is movably inserted into the top of the sampling valve core, a first spring is movably sleeved on the second plug rod, the top of the first spring is fixedly installed on the bottom of the sealing gasket, a sampling tube is fixedly installed on the top of the sampling valve core, and the sealing gasket is slidably sealed and connected to the outer wall of the sampling tube and the inner wall of the support.

[0012] As a preferred embodiment of the present invention, the connecting component includes a notch and a connecting groove, the notch is arranged at the bottom of the inner wall of the support member and is connected with the accommodating cavity, the connecting groove is arranged on the outside of the sampling valve core, and the connecting component realizes the connection between the inside of the accommodating cavity and the space between the sampling valve core and the sealing gasket through the connection between the connecting groove and the notch, and a pressure-conducting component is fixedly installed at one end of the accommodating cavity, and the pressure-conducting component is used to transfer the liquid pressure when the sampling valve core leaks.

[0013] As a preferred embodiment of the present invention, the pressure-conducting assembly includes a flow guide pad, the bottom of which is fixedly mounted at one end of the accommodating cavity, and the height of the flow guide pad is matched with the height of the notch, the internal sliding seal of the accommodating cavity is connected with a sealing ring, and an angle is formed between the bottom of the sealing ring and the bottom of the flow guide pad, and the pressure-conducting assembly transfers the liquid pressure when the sampling valve core leaks to the bottom of the sealing ring through the angle between the sealing ring and the flow guide pad.

[0014] As a preferred embodiment of the present invention, a sealing mechanism is provided at the bottom of the sampling valve core, and the sealing mechanism includes a sleeve, and a sealing plate is movably connected to the inner wall of the sleeve, and an open groove is provided at one end of the sleeve. The sealing mechanism realizes the sealing of the main pipeline through the cooperation between the sealing plate and the sleeve. The sealing mechanism also includes an elastic extrusion component, and the elastic extrusion component includes a second spring, and a bottom plate is fixedly installed at one end of the second spring, and the bottom plate is fixedly installed at the bottom of the sleeve. The elastic extrusion component squeezes the sealing plate and fits with the top of the sleeve through the elastic force of the second spring.

[0015] As a preferred embodiment of the present invention, a pressure alarm mechanism is provided on the top of the support member, and the pressure alarm mechanism includes an alarm, and the alarm is fixedly mounted on the side of the support member, and a pressure plate is rotatably connected to the support member, and one end of the pressure plate is aligned with the trigger switch of the alarm, and a push rod is movably inserted on the support member, and one end of the push rod is aligned with the pressure plate, and the other end of the push rod extends to the inside of the accommodating cavity and is fixedly connected to the sealing ring.

[0016] As a preferred embodiment of the present invention, the control mechanism also includes a transmission assembly and a pressure assembly, the transmission assembly is used to apply the pressure generated by the pressure assembly to the clamping plate, the top of the support member is provided with a mounting groove, the clamping plate is located inside the mounting groove, the side surface of the clamping plate is an arc-shaped structure adapted to the upper pad, the bottom of the upper pad is arranged on the top of the sealing gasket, and an adapter ring is fixedly installed at one end of the upper pad, the inner wall of the upper pad is provided with an embedded ring, the embedded ring is fixedly connected to the sealing gasket, a second plug rod is installed at the bottom of the upper pad, the second plug rod movably penetrates the sealing gasket and extends to the inside of the sampling valve core, a positioning rod movably inserted into the inside of the second plug rod, and the top of the positioning rod is fixedly connected to the upper pad.

[0017] As a preferred embodiment of the present invention, the transmission assembly includes a sliding rod, which is fixedly connected to the splint and slidably connected to one end of the support member, a push block is fixedly installed on one end of the sliding rod, a telescopic rod is installed on one end of the push block, one end of the telescopic rod is fixedly connected to the support member, and a third spring is movably sleeved on the telescopic rod.

[0018] As a preferred embodiment of the present invention, the pressure assembly includes a guide plate, which is spirally arranged and fixedly installed on the outside of the secondary pipeline. The end of the main pipeline is rotatably connected with a push plate, and one end of the push plate is fixedly installed with a push rod, one end of the push rod is adapted to the guide plate, and one end of the push plate is adapted to the push block.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention samples the fluid in the main pipeline by arranging a sampling valve core, which is convenient and quick to operate. When the sampling valve core is damaged, the fluid can be collected through the accommodating cavity, thereby avoiding fluid leakage and triggering an alarm.

[0021] The present invention provides a sealing plate to perform secondary sealing on the main pipeline, so that when the sampling valve core is taken out, the fluid in the main pipeline is ensured not to leak out, and the delivery of the fluid is not delayed;

[0022] The present invention enables the cooperation between the piston and the sampling valve core to squeeze out all the fluid, thereby preventing a large amount of fluid from remaining in the sampling valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of a pipeline sampling device in maintenance state according to the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of a pipeline sampling device in use state of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the support member of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the sealing ring of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the sampling valve core of the present invention;

[0028] Figure 6 This is a schematic diagram of the internal structure of the sampling valve core of the present invention;

[0029] Figure 7 This is a structural schematic diagram of the sealing plate of the present invention;

[0030] Figure 8 It is a schematic diagram of the structure of the clamping plate of the present invention.

[0031] Reference numerals:

[0032] 100, main pipeline; 101, support member; 102, sampling valve core; 103, piston; 104, sealing plate; 105, first plug rod; 106, sealing gasket; 107, second plug rod; 108, first spring; 109, upper pad; 110, adapter ring; 111, sampling tube; 112, positioning rod; 113, embedded ring;

[0033] 200, sealing ring; 201, guide pad; 202, notch; 203, connecting groove; 204, ejector rod; 205, pressing plate; 206, alarm; 207, accommodating chamber;

[0034] 300, sleeve; 301, opening groove; 302, bottom plate; 303, second spring; 304, sealing plate;

[0035] 400, mounting groove; 401, clamping plate; 402, sliding rod; 403, pushing block; 404, telescopic rod; 405, third spring; 406, pushing plate; 407, pushing rod; 408, guide plate; 409, auxiliary pipeline. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention.

[0037] Example 1

[0038] like Figures 1 to 8 As shown, a pipeline sampling device includes a main pipeline 100 and a secondary pipeline 409, the main pipeline 100 and the secondary pipeline 409 are rotatably connected, a sampling mechanism is provided on the main pipeline 100, the sampling mechanism includes a sampling valve core 102, a piston 103 is movably inserted inside the sampling valve core 102, and the sampling mechanism controls the opening state of the sampling valve core 102 through the piston 103;

[0039] The main pipeline 100 is also provided with a receiving mechanism, which includes a support member 101, one end of which is fixedly mounted on the outside of the main pipeline 100, and an accommodating cavity 207 is provided inside the support member 101, and a connecting component is provided between the accommodating cavity 207 and the sampling valve core 102, and the connecting component is used to connect the accommodating cavity 207 with the space above the sampling valve core 102;

[0040] A control mechanism is disposed on the top of the support member 101 . The control mechanism includes a clamping plate 401 and an upper pad 109 . The control mechanism controls the unlocking state of the sampling mechanism through the friction force between the clamping plate 401 and the upper pad 109 .

[0041] like Figures 5 and 6 As shown, in a specific embodiment, an elastic reset assembly is provided at the top of the sampling mechanism, a first plug rod 105 is installed at the bottom of the elastic reset assembly, the bottom of the first plug rod 105 movably penetrates the sampling valve core 102 and extends to the bottom, a sealing plate 104 is fixedly installed at the bottom of the first plug rod 105, the top of the sealing plate 104 is fixedly connected to the bottom of the piston 103, and the elastic reset assembly is used to reset the piston 103 until it maintains a sealed state with the sampling valve core 102. In this configuration, the piston 103 is truncated cone-shaped, and when the piston 103 is reset, the residual fluid inside can be emptied.

[0042] like Figures 5 and 6As shown, further, the elastic reset assembly includes a sealing gasket 106, a second plug rod 107 is fixedly installed at the bottom of the sealing gasket 106, the bottom of the second plug rod 107 is movably plugged into the top of the sampling valve core 102, a first spring 108 is movably sleeved on the second plug rod 107, the top of the first spring 108 is fixedly installed at the bottom of the sealing gasket 106, a sampling tube 111 is fixedly installed at the top of the sampling valve core 102, and the sealing gasket 106 is slidably sealed and connected with the outer wall of the sampling tube 111 and the inner wall of the support member 101. In this setting, when sampling, a sampling bottle with a longer bottleneck is used, the bottle mouth is aligned with the sampling tube 111, and the embedded ring 113 is squeezed upward, at which time the embedded ring 113 drives the sealing gasket 106 to move, and the sealing gasket 106 drives the sealing plate 104 to move through the first plug rod 105, thereby moving the piston 103.

[0043] Example 2

[0044] like Figure 3 , Figure 5 , Figure 7 As shown, in a specific embodiment, the connecting component includes a notch 202 and a connecting groove 203. The notch 202 is provided at the bottom of the inner wall of the support member 101 and is connected to the accommodating chamber 207. The connecting groove 203 is provided on the outside of the sampling valve core 102. The connecting component realizes the connection between the inside of the accommodating chamber 207 and the space between the sampling valve core 102 and the sealing gasket 106 through the connection between the connecting groove 203 and the notch 202. A pressure-conducting component is fixedly installed at one end of the accommodating chamber 207. The pressure-conducting component is used to transfer the liquid pressure when the sampling valve core 102 leaks. In this setting, the fluid enters the accommodating chamber 207 through the notch 202 and the connecting groove 203 when leaking.

[0045] like Figure 3 , Figure 4 As shown, further, the pressure-conducting assembly includes a flow-conducting pad 201, the bottom of which is fixedly mounted at one end of the accommodating chamber 207, and the height of the flow-conducting pad 201 matches the height of the notch 202, and the internal sliding seal of the accommodating chamber 207 is connected with a sealing ring 200, and an angle is formed between the bottom of the sealing ring 200 and the bottom of the flow-conducting pad 201, and the pressure-conducting assembly transfers the liquid pressure when the sampling valve core 102 leaks to the bottom of the sealing ring 200 through the angle between the sealing ring 200 and the flow-conducting pad 201. In this configuration, the cross section of the flow-conducting pad 201 is triangular, so that the fluid can enter between the flow-conducting pad 201 and the sealing ring 200, and the triangular cross section also helps to empty the fluid in the accommodating chamber 207.

[0046] like Figure 3 , Figure 7As shown, further, a sealing mechanism is provided at the bottom of the sampling valve core 102, the sealing mechanism includes a sleeve 300, the inner wall of the sleeve 300 is movably connected with a sealing plate 304, one end of the sleeve 300 is provided with an open groove 301, the sealing mechanism realizes the sealing of the main pipeline 100 through the cooperation between the sealing plate 304 and the sleeve 300, the sealing mechanism also includes an elastic extrusion component, the elastic extrusion component includes a second spring 303, one end of the second spring 303 is fixedly installed with a bottom plate 302, the bottom plate 302 is fixedly installed at the bottom of the sleeve 300, and the elastic extrusion component uses the elastic force of the second spring 303 to squeeze the sealing plate 304 and fit with the top of the sleeve 300. In this setting, when the sampling valve core 102 is damaged and taken out, the sealing plate 304 is connected to the sleeve 300 through the sealing connection, so that the fluid inside the main pipeline 100 does not leak.

[0047] like Figure 3 , Figure 4 As shown, further, a pressure alarm mechanism is provided on the top of the support 101, and the pressure alarm mechanism includes an alarm 206, which is fixedly mounted on the side of the support 101, and a pressing plate 205 is rotatably connected to the support 101, one end of the pressing plate 205 is aligned with the trigger switch of the alarm 206, and a push rod 204 is movably inserted on the support 101, one end of the push rod 204 is aligned with the pressing plate 205, and the other end of the push rod 204 extends to the inside of the accommodating chamber 207 and is fixedly connected to the sealing ring 200. In this setting, the pressure of the fluid inside the accommodating chamber 207 acts on the sealing ring 200, so that the sealing ring 200 moves, and the sealing ring 200 drives the push rod 204 to move, and the push rod 204 triggers the alarm 206 to alarm by pressing the pressing plate 205.

[0048] Example 3

[0049] like Figure 5 , Figure 8As shown, in a specific embodiment, the control mechanism also includes a transmission assembly and a pressure assembly, the transmission assembly is used to apply the pressure generated by the pressure assembly to the clamp 401, the top of the support member 101 is provided with a mounting groove 400, the clamp 401 is located inside the mounting groove 400, the side of the clamp 401 is an arc-shaped that is compatible with the upper pad 109, the bottom of the upper pad 109 is arranged on the top of the sealing gasket 106, and an adapter ring 110 is fixedly installed at one end of the upper pad 109, the inner wall of the upper pad 109 is provided with an embedded ring 113, the embedded ring 113 is fixedly connected to the sealing gasket 106, a second plug rod 107 is installed at the bottom of the upper pad 109, the second plug rod 107 movably penetrates the sealing gasket 106 and extends to the inside of the sampling valve core 102, a positioning rod 112 is movably inserted inside the second plug rod 107, and the top of the positioning rod 112 is fixedly connected to the upper pad 109. In this configuration, the adapter ring 110 is screwed with a wrench, and the upper pad 109 and the positioning rod 112 are rotated, thereby driving the sampling valve core 102 to rotate, and the sampling valve core 102 is screwed out.

[0050] like Figure 8 As shown, further, the transmission assembly includes a slide rod 402, the slide rod 402 is fixedly connected to the clamp plate 401, and the slide rod 402 is slidably connected to one end of the support member 101, a push block 403 is fixedly installed at one end of the slide rod 402, a telescopic rod 404 is installed at one end of the push block 403, one end of the telescopic rod 404 is fixedly connected to the support member 101, and a third spring 405 is movably sleeved on the telescopic rod 404; the pressure assembly includes a guide plate 408, the guide plate 408 is spirally arranged, and the guide plate 408 is fixedly installed on the outside of the secondary pipe 409, the end of the main pipe 100 is rotatably connected to the push plate 406, one end of the push plate 406 is fixedly installed with a push rod 407, one end of the push rod 407 is adapted to the guide plate 408, and one end of the push plate 406 is adapted to the push block 403. In this configuration, the guide plate 408 presses against the push rod 407 to make the push plate 406 rotate, and the push plate 406 pushes the push block 403 to move, and then pushes the clamping plate 401 through the sliding rod 402 to clamp the upper pad 109. At this time, the upper pad 109 cannot rotate under the clamping action of the clamping plate 401.

[0051] The implementation principle of a pipeline sampling device of this embodiment is as follows: when sampling, the support member 101 needs to be kept in a vertical downward state, at this time, the guide plate 408 abuts against the push rod 407 to make the push plate 406 rotate, the push plate 406 pushes the push block 403 to move, and then pushes the clamping plate 401 through the sliding rod 402 to clamp the upper pad 109, at this time, the upper pad 109 cannot rotate under the clamping action of the clamping plate 401;

[0052] When sampling, a sampling bottle with a longer bottleneck is used, and its bottle mouth is aligned with the sampling tube 111, and the embedded ring 113 is squeezed upward. At this time, the embedded ring 113 drives the sealing gasket 106 to move, and the sealing gasket 106 drives the sealing plate 104 to move through the first plug rod 105, so that the piston 103 moves, and the piston 103 and the sampling valve core 102 are opened. When the sealing plate 104 moves, it presses against the sealing plate 304 to move and moves it to the opening groove 301. At this time, the liquid in the main pipeline 100 enters the interior of the sampling valve core 102 through the opening groove 301, and enters the sampling bottle through the sampling tube 111;

[0053] When sampling is completed, the sampling bottle is released, and the elastic force of the first spring 108 drives the sealing gasket 106 to reset, thereby resetting the piston 103. At this time, the sampling valve core 102 is closed, and the fluid inside it is squeezed and completely discharged by the piston 103. At the same time, the residual liquid in the sampling tube 111 drips into the sampling bottle;

[0054] When the sampling valve core 102 is damaged, the sealing state between the sealing plate 304 and the sleeve 300 prevents the fluid in the main pipeline 100 from leaking. When sampling, the sealing plate 304 will separate from the sleeve 300, allowing the fluid to enter the sampling valve core 102. At this time, the sampling valve core 102 leaks fluid due to damage, and in the process of continuous leakage, it enters the accommodating chamber 207 through the connecting groove 203 and the notch 202. The pressure of the fluid in the accommodating chamber 207 acts on the sealing ring 200, so that the sealing ring 200 moves, and the sealing ring 200 drives the push rod 204 to move. The push rod 204 triggers the alarm 206 to alarm by pressing against the pressure plate 205.

[0055] When it is known that the sampling valve core 102 is damaged, the sampling bottle is taken out and the main pipeline 100 is turned over. The taking out of the sampling bottle makes the sealing plate 304 seal the main pipeline 100 again. When the main pipeline 100 is turned over, the guide plate 408 no longer presses against the push rod 407. At this time, the elastic force of the third spring 405 pushes the push block 403 to move, and then drives the clamping plate 401 to separate from the upper pad 109 through the sliding rod 402.

[0056] The adapter ring 110 is screwed with a wrench to rotate the upper pad 109 and the positioning rod 112, thereby driving the sampling valve core 102 to rotate, so as to screw the sampling valve core 102 out. At this time, the fluid in the accommodating chamber 207 flows into the location of the sampling valve core 102. After the sampling valve core 102 is replaced, it is screwed into the main pipeline 100 and the sealing ring 200 is reset. Under the pressure of the sealing ring 200 and the sampling valve core 102, the fluid overcomes the resistance of the second spring 303 to the sealing plate 304 and returns to the main pipeline 100.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A pipeline sampling device, comprising a main pipeline (100) and a secondary pipeline (409), wherein the main pipeline (100) and the secondary pipeline (409) are rotatably connected, characterized in that: The main pipeline (100) is provided with a sampling mechanism, the sampling mechanism comprising a sampling valve core (102), a piston (103) being movably inserted into the sampling valve core (102), and the sampling mechanism controls the opening state of the sampling valve core (102) through the piston (103); The main pipeline (100) is also provided with a containing mechanism, the containing mechanism comprising a support member (101), one end of the support member (101) being fixedly mounted on the outside of the main pipeline (100), a containing cavity (207) being provided inside the support member (101), a connecting component being provided between the containing cavity (207) and the sampling valve core (102), the connecting component being used to connect the containing cavity (207) with the space above the sampling valve core (102); A control mechanism is provided on the top of the support member (101), the control mechanism comprising a clamping plate (401) and an upper pad (109), and the control mechanism controls the unlocking state of the sampling mechanism through the friction force between the clamping plate (401) and the upper pad (109); An elastic reset component is arranged at the top of the sampling mechanism, a first plug rod (105) is installed at the bottom of the elastic reset component, the bottom of the first plug rod (105) movably penetrates the sampling valve core (102) and extends to the bottom of the sampling valve core (102), a sealing plate (104) is fixedly installed at the bottom of the first plug rod (105), the top of the sealing plate (104) is fixedly connected to the bottom of the piston (103), and the elastic reset component is used to reset the piston (103) until it maintains a sealed state with the sampling valve core (102); The elastic reset assembly comprises a sealing gasket (106), a second plug rod (107) is fixedly mounted on the bottom of the sealing gasket (106), the bottom of the second plug rod (107) is movably plugged into the top of the sampling valve core (102), a first spring (108) is movably sleeved on the second plug rod (107), the top of the first spring (108) is fixedly mounted on the bottom of the sealing gasket (106), a sampling tube (111) is fixedly mounted on the top of the sampling valve core (102), and the sealing gasket (106) is slidably sealedly connected to the outer wall of the sampling tube (111) and the inner wall of the support member (101); The communication component comprises a notch (202) and a communication groove (203); the notch (202) is provided at the bottom of the inner wall of the support member (101) and is in communication with the accommodating cavity (207); the communication groove (203) is provided on the outside of the sampling valve core (102); the communication component realizes communication between the interior of the accommodating cavity (207) and the space between the sampling valve core (102) and the sealing gasket (106) through the communication between the communication groove (203) and the notch (202); a pressure-conducting component is fixedly mounted at one end of the accommodating cavity (207); the pressure-conducting component is used to transfer liquid pressure when the sampling valve core (102) leaks; The pressure-conducting assembly comprises a flow-conducting pad (201), the bottom of the flow-conducting pad (201) being fixedly mounted on one end of the accommodating cavity (207), and the height of the flow-conducting pad (201) being matched to the height of the notch (202); a sealing ring (200) is slidably and sealably connected inside the accommodating cavity (207), an angle being formed between the bottom of the sealing ring (200) and the bottom of the flow-conducting pad (201); and the pressure-conducting assembly transfers the liquid pressure when the sampling valve core (102) leaks to the bottom of the sealing ring (200) through the angle between the sealing ring (200) and the flow-conducting pad (201); A sealing mechanism is provided at the bottom of the sampling valve core (102), the sealing mechanism comprising a sleeve (300), the inner wall of the sleeve (300) being movably connected with a sealing plate (304), one end of the sleeve (300) being provided with an open groove (301), the sealing mechanism realizing sealing of the main pipeline (100) through the cooperation between the sealing plate (304) and the sleeve (300), the sealing mechanism further comprising an elastic extrusion component, the elastic extrusion component comprising a second spring (303), one end of the second spring (303) being fixedly mounted with a bottom plate (302), the bottom plate (302) being fixedly mounted at the bottom of the sleeve (300), the elastic extrusion component extruding the sealing plate (304) through the elastic force of the second spring (303) and fitting with the top of the sleeve (300).

2. A pipeline sampling device according to claim 1, characterized in that: A pressure alarm mechanism is provided on the top of the support member (101), the pressure alarm mechanism comprising an alarm (206), the alarm (206) being fixedly mounted on the side of the support member (101), a pressure plate (205) being rotatably connected to the support member (101), one end of the pressure plate (205) being aligned with a trigger switch of the alarm (206), a push rod (204) being movably plugged into the support member (101), one end of the push rod (204) being aligned with the pressure plate (205), and the other end of the push rod (204) extending into the interior of the accommodating cavity (207) and being fixedly connected to the sealing ring (200).

3. A pipeline sampling device according to claim 2, characterized in that: The control mechanism further comprises a transmission assembly and a pressure assembly, wherein the transmission assembly is used to apply pressure generated by the pressure assembly to the clamping plate (401), a mounting groove (400) is provided on the top of the support member (101), the clamping plate (401) is located inside the mounting groove (400), the side surface of the clamping plate (401) is an arc shape adapted to the upper pad (109), the bottom of the upper pad (109) is arranged on the top of the sealing pad (106), and an adaptor ring ( 110), an inner wall of the upper pad (109) is provided with an embedded ring (113), the embedded ring (113) is fixedly connected to the sealing gasket (106), a second plug rod (107) is installed at the bottom of the upper pad (109), the second plug rod (107) movably penetrates the sealing gasket (106) and extends to the inside of the sampling valve core (102), a positioning rod (112) is movably inserted into the inside of the second plug rod (107), and the top of the positioning rod (112) is fixedly connected to the upper pad (109).

4. A pipeline sampling device according to claim 3, characterized in that: The transmission assembly comprises a sliding rod (402), wherein the sliding rod (402) is fixedly connected to the clamping plate (401), and the sliding rod (402) is slidably connected to one end of the support member (101), a push block (403) is fixedly installed on one end of the sliding rod (402), a telescopic rod (404) is installed on one end of the push block (403), one end of the telescopic rod (404) is fixedly connected to the support member (101), and a third spring (405) is movably sleeved on the telescopic rod (404).

5. A pipeline sampling device according to claim 4, characterized in that: The pressure assembly comprises a guide plate (408), the guide plate (408) is spirally arranged and fixedly mounted on the outside of the secondary pipe (409), the end of the main pipe (100) is rotatably connected to a push plate (406), one end of the push plate (406) is fixedly mounted with a push rod (407), one end of the push rod (407) is matched with the guide plate (408), and one end of the push plate (406) is matched with the push block (403).

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