Automatic suction and propulsion device for needle tube

Abstract

The invention provides an automatic suction and propelling device for a needle tube. The automatic suction and propelling device comprises a suction needle tube, a fixing table, a bottom plate, a needle tube support and a push-pull mechanism. The suction needle tube comprises a needle cylinder and a core rod arranged in the needle cylinder in a sliding mode, one end of the core rod is located outside the fixing table, buckled in the needle tube support and moves along with the needle tube support, and a nipple on the needle cylinder is communicated with an oil discharge outlet of equipment to be detected through a first pipeline; a waste oil tank is further included, one end of the waste oil tank is provided with an oil inlet, the oil inlet is communicated with the first pipeline through a second pipeline, and a first switch valve is arranged on the second pipeline. Compared with a conventional sampling mode, the sampling mode provided by the invention has the advantages that the insulating oil is not in contact with external air in the whole process, the final detection accuracy is ensured, the waste is less during sampling operation, the operation is clean and convenient, the sampling time is short, and the sampling speed is high.

Description

Technical Field

[0001] The invention relates to the technical field of power plant insulating oil extraction test, and in particular to a needle tube automatic suction and propulsion device. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] After the oil-immersed transformer is put into use for a period of time, it is necessary to sample and test the insulating oil inside it. The existing method of sampling the insulating oil usually uses a sampling bottle or a sampling needle tube to sample. The specific sampling process is: prepare an oil receiving basin, then open the oil drain port under the transformer, and the insulating oil inside the transformer is discharged through the oil drain port and caught by the oil receiving basin, and then open the sampling bottle or sampling needle tube to receive the insulating oil discharged from the oil drain port (not directly filled with oil in the basin). In this process, the sampling bottle or sampling needle tube needs to be rinsed with the discharged insulating oil for many times to ensure that there is no foreign matter or impurities inside the sampling bottle or sampling needle tube. After the sampling is completed, the oil drain port is closed, and then the bottle mouth of the sampling bottle is plugged with a stopper, or a rubber sleeve is put on the outlet of the sampling needle tube to complete the sampling.

[0004] In the above-mentioned sampling method, for the method of sampling with a sampling needle tube, it is necessary to first separate the push rod inside the sampling needle tube from the tube body, use the tube body of the needle tube to receive the insulating oil, and then insert the push rod into the tube body after receiving the oil, push the insulating oil out to complete a cleaning, and after the cleaning is completed and filled with oil again, insert the push rod into the tube body again, and then lightly tap the tube body to concentrate the bubbles in the tube body at the outlet, slowly push the push rod until the bubbles are completely discharged, and finally cover the outlet of the needle tube with the rubber sleeve to complete the sampling.

[0005] For the traditional method of sampling with a sampling needle, the sampling time is long. When collecting the oil, the workers' hands will be stained with insulating oil, and it is easy to get it on their clothes and difficult to clean. At the same time, this sampling method will waste a lot of insulating oil (because during the sampling process, the oil drain port is open throughout the process and the oil is collected by the oil receiving basin). In addition, since the insulating oil is in contact with the external air, it is easy to affect the accuracy of the final detection, so there is room for improvement. Summary of the invention

[0006] The main purpose of the present invention is to provide a needle automatic suction and propulsion device which has a fast sampling speed, does not contact with the outside air, and has less waste when sampling insulating oil.

[0007] To achieve the above-mentioned purpose, the technical solution of the present invention is implemented as follows: an automatic needle tube suction and propulsion device, comprising a suction needle tube, a fixing platform for supporting and fixing the suction needle tube, a bottom plate arranged below the fixing platform, a needle tube drag arranged on one side of the fixing platform, and a push-pull mechanism for driving the needle tube drag to reciprocate along the length direction of the suction needle tube;

[0008] The aspiration needle tube comprises a syringe and a core rod slidably arranged in the syringe, one end of the core rod of the aspiration needle tube fixed on the fixed platform is located outside the fixed platform and extends into the needle tube drag, and moves with the needle tube drag, and the nipple on the syringe is connected to the oil discharge port of the device to be tested through the first pipeline;

[0009] It also includes a waste oil tank, one end of which has an oil inlet, the oil inlet is connected to the first pipeline through a second pipeline, and a first switch valve is arranged on the second pipeline to control the opening and closing of the second pipeline.

[0010] Furthermore, the needle tube drag comprises a sliding block and a holder which is ball-hinged on the sliding block, one end of the core rod is clamped in the holder, and the push-pull mechanism is connected to the sliding block.

[0011] Furthermore, the ball joint between the card seat and the sliding block is located in the middle of the card seat, and multiple elastic parts are evenly distributed around the ball joint. The elastic parts are located between the card seat and the sliding block, and are respectively abutted against the card seat and the sliding block to adjust the posture of the card seat.

[0012] Furthermore, the fixing platform is rotatably mounted on the bottom plate.

[0013] Furthermore, a pressure sensor is provided on the first pipeline for detecting the pressure in the first pipeline when the oil discharge port of the device to be detected is opened.

[0014] Furthermore, it also includes a control processor, which is connected to the pressure sensor and the push-pull mechanism and is used to prevent the push-pull mechanism from starting when the pressure in the first pipeline is lower than a preset pressure value.

[0015] Furthermore, the push-pull mechanism is a screw-nut mechanism, and the screw is driven to rotate by a servo motor.

[0016] Furthermore, the fixing table is provided with a pressing and fixing component, and the pressing and fixing component is used to press and fix the syringe on the fixing table.

[0017] Further, a groove for supporting the syringe is provided at a position of the fixed platform corresponding to the syringe, and the groove is used to limit the posture of the syringe relative to the fixed platform. One end of the syringe has an end plate, and a first slot is provided at a position of the fixed platform corresponding to the end plate. The end plate is clamped in the first slot to limit the movement of the syringe along its own length direction;

[0018] One end of the core rod is provided with a push plate, and the needle tube drag is provided with a second clamping groove, and the push plate is clamped in the second clamping groove and moves together with the needle tube drag.

[0019] Furthermore, a pressure cover is provided on the top of the card seat, and the pressure cover is used to press the push plate into the card seat from top to bottom.

[0020] The beneficial effects of the present invention are embodied in:

[0021] Compared with conventional sampling methods, the present invention uses a sampling method in which the insulating oil does not come into contact with the outside air throughout the entire process, thereby ensuring the ultimate detection accuracy. Furthermore, during the sampling operation, there is less waste, and the operation is clean and convenient, with a short sampling time and a high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the attached picture:

[0023] Figure 1 This is a working principle diagram of the automatic needle suction and propulsion device of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the automatic needle suction and propulsion device of the present invention;

[0025] Figure 3 A front view of the automatic needle aspiration and advancement device of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the fixing platform described in the present invention.

[0027] Description of reference numerals:

[0028] 1. Suction needle tube; 11. Syringe; 111. End plate; 12. Core rod; 121. Push plate; 2. Fixed platform; 21. Groove; 22. First card slot; 3. Bottom plate; 4. Needle tube drag; 41. Sliding block; 42. Card seat; 421. Second card slot; 43. Pressure cover; 44. Elastic member; 5. Push-pull mechanism; 6. First pipeline; 61. Pressure sensor; 7. Waste oil tank; 71. Second switch valve; 72. Liquid level gauge; 73. Third switch valve; 8. Second pipeline; 81. First switch valve; 9. Press and fix component. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the invention.

[0030] See also Figures 1 to 4 .

[0031] The present invention discloses an automatic needle tube suction and propulsion device, comprising a suction needle tube 1, a fixing platform 2 for supporting and fixing the suction needle tube 1, a bottom plate 3 arranged below the fixing platform 2, a needle tube drag 4 arranged on one side of the fixing platform 2, and a push-pull mechanism 5 for driving the needle tube drag 4 to reciprocate along the length direction of the suction needle tube 1;

[0032] The suction needle tube 1 comprises a syringe 11 and a core rod 12 slidably disposed in the syringe 11. One end of the core rod 12 of the suction needle tube 1 fixed on the fixed platform 2 is located outside the fixed platform 2 and buckled in the syringe drag 4, and moves with the syringe drag 4. The nipple on the syringe 11 is connected to the oil discharge port of the device to be tested through the first pipeline 6.

[0033] It also includes a waste oil tank 7, one end of which has an oil inlet, which is connected to the first pipeline 6 through a second pipeline 8, and a first switch valve 81 is provided on the second pipeline 8 to control the opening and closing of the second pipeline 8.

[0034] In the specific implementation, the nipple on the syringe 11 is connected to the oil discharge port of the device to be tested through the first pipe 6, and then the oil discharge port on the device to be tested is opened (that is, the oil discharge port of the oil-immersed transformer, the conventional oil discharge port structure can be rotated to open and close like a valve), and at the same time, the push-pull mechanism 5 is started to drive the needle tube drag 4 to move away from the suction needle tube 1. Of course, since the oil discharged from the oil discharge port has a certain oil pressure, the core rod 12 in the syringe 11 can also be pushed by the oil pressure, and then the needle tube drag 4 and the push-pull mechanism 5 are pushed to move. After the insulating oil in the syringe 11 reaches the specified volume, the oil stops entering ( The first switch valve 81 is opened, and then the push-pull mechanism 5 pushes the needle tube drag 4 to move towards the direction close to the suction needle tube 1, and the core rod 12 discharges the insulating oil in the syringe 11 into the waste oil tank 7 through the second pipe 8, and then the first switch valve 81 is closed, thus completing the cleaning of the suction needle tube 1; start to add oil again (which can be achieved by opening the oil drain port again), and then repeat the above steps until the suction needle tube 1 completes the specified number of cleanings; after the cleaning is completed, add oil to the syringe 11 again, and then close the oil drain port, remove the suction needle tube 1, and cover the nipple of the suction needle tube 1 with a rubber sleeve to complete the sampling.

[0035] Compared with conventional sampling methods, in the sampling method of the present application, the insulating oil will not come into contact with the outside air throughout the entire process, thereby ensuring the final detection accuracy. In addition, there is less waste during the sampling operation, and the operation is clean and convenient, with a short sampling time and a fast speed, which is a great improvement.

[0036] Preferably, the waste oil tank 7 is a closed tank body, and is provided with an air port and a second switch valve 71 for controlling the opening and closing of the air port, which is used to keep the tank body connected with the outside when the oil enters or is discharged from the tank body; the waste oil tank 7 is also provided with a liquid level meter 72 (a laser liquid level meter 72 is shown in the figure) for measuring the height of the oil in the tank body; one end of the tank body is also provided with a waste oil discharge outlet and a third switch valve 73 for controlling the opening and closing of the waste oil discharge outlet, which is used to discharge the waste oil in the tank body.

[0037] In one embodiment, a groove 21 for supporting the syringe 11 is provided at a position of the fixed platform 2 corresponding to the syringe 11, and the groove 21 is used to limit the posture of the syringe 11 relative to the fixed platform 2. One end of the syringe 11 has an end plate 111, and a first slot 22 is provided at a position of the fixed platform 2 corresponding to the end plate 111. The end plate 111 is clamped in the first slot 22 to limit the movement of the syringe 11 along its own length direction;

[0038] One end of the core rod 12 has a push plate 121, and the needle tube drag 4 is provided with a second clamping groove 421. The push plate 121 is clamped in the second clamping groove 421 and moves with the needle tube drag 4. This design is convenient for limiting the position and taking and placing the aspiration needle tube 1.

[0039] In one embodiment, the needle tube drag 4 includes a sliding block 41 and a holder 42 which is ball-hinged on the sliding block 41, the second slot 421 is arranged on the holder 42, and the push-pull mechanism 5 is connected to the sliding block 41 to drive the sliding block 41 to move. This design can ensure that the needle tube keeps the syringe 11 and the core rod 12 on the same axis during the pushing and pulling process, and avoid the problem of the syringe 11 and the core rod 12 being stuck or stuck.

[0040] In one embodiment, a pressing cover 43 is disposed on the top of the card seat 42 , and the pressing cover 43 is used to press the push plate 121 into the card seat 42 from top to bottom.

[0041] In a specific implementation, a first stud is provided on the top of the holder 42, and a through hole matching the first stud is provided on the gland 43. The gland 43 passes through the first stud and is pressed on the push plate 121, and then the nut is used to squeeze the gland 43 to prevent the gland 43 from moving up. More preferably, a spring can be provided between the nut and the gland 43, and the squeezing force is transmitted to the gland 43 through the nut spring, so that the pressure of the gland 43 can be maintained, and when the push plate 121 is taken out, the gland 43 can be manually moved up to facilitate the removal of the push plate 121.

[0042] Preferably, the pressure cover 43 is provided with a third slot that cooperates with the push plate 121 , so that the push plate 121 can be better limited to prevent the push plate 121 from being separated from the card seat 42 .

[0043] In one embodiment, the ball hinge of the socket 42 and the sliding block 41 is located in the middle of the socket 42. A plurality of elastic members 44 are evenly distributed around the ball hinge. The elastic members 44 are located between the socket 42 and the sliding block 41, and are respectively in contact with the socket 42 and the sliding block 41 for adjusting the posture of the socket 42.

[0044] In a specific implementation, if the elastic member 44 is not provided, the relative position of the holder 42 and the sliding block 41 in the initial state is not easy to determine, and it is inconvenient to install the push plate 121 without the support of the elastic member 44. In addition, the elastic member 44 can be a spring with a relatively high hardness, so that the accuracy will be better.

[0045] In one embodiment, the fixing platform 2 is rotatably mounted on the bottom plate 3. Specifically, the fixing platform 2 is penetrated through the bottom plate 3 by a pin shaft, so that the fixing platform 2 can rotate relative to the top surface of the bottom plate 3, which is adapted to the ball-hinged clamping seat 42, and can better ensure that the syringe 11 and the core rod 12 are on the same axis, avoiding the problem of the syringe 11 and the core rod 12 being stuck or stuck.

[0046] Preferably, two pins can be passed between the fixed platform 2 and the base plate 3, respectively located at the two ends of the length direction of the fixed platform 2. When there are two pins, the fixed platform 2 cannot rotate relative to the base plate 3, thereby limiting the relative position of the fixed platform 2 and the base plate 3, and the installation and replacement of the suction needle tube 1 can be performed.

[0047] In one embodiment, a pressure sensor 61 is provided on the first pipe 6, which is used to detect the pressure in the first pipe 6 when the oil outlet of the device to be detected is opened. In this design, the opening radius of the oil outlet of the device to be detected and whether it is blocked can be known through the pressure sensor 61. A control processor and an alarm device can be connected later to alarm when the oil pressure is lower than a specified value.

[0048] In one embodiment, a control processor (not shown in the figure) is further included, and the control processor is connected to the pressure sensor 61 and the push-pull mechanism 5, and is used to prevent the push-pull mechanism 5 from starting when the pressure in the first pipeline 6 is lower than the preset pressure. This design, on the one hand, prevents the push-pull mechanism 5 from starting when the oil discharge port is blocked, causing damage to the pipeline and the suction needle tube 1, and prevents the opening amplitude of the oil discharge port from being too small. If the negative pressure inside the suction needle tube 1 is too large, it is easy to emulsify the insulating oil discharged from the oil discharge port, which is not conducive to improving the detection accuracy.

[0049] In one embodiment, the push-pull mechanism 5 is a screw-nut mechanism, which drives the screw to rotate by a servo motor so that the nut moves back and forth on the screw. The needle tube drag 4 is connected to the nut and moves with the nut.

[0050] In the specific implementation, although the push-pull mechanism 5 can also be implemented by a pneumatic telescopic cylinder, a hydraulic telescopic cylinder or an electric telescopic rod, the combination of the screw nut mechanism and the servo motor can more accurately control the moving speed and moving distance of the needle tube drag 4, and is also convenient for speed adjustment, and is suitable for suction needle tubes 1 of different specifications and oil discharge ports of different openings. Since the specific structure of the screw nut mechanism belongs to the common knowledge of those skilled in the art, it will not be described in detail here.

[0051] Preferably, the push-pull mechanism 5 is arranged below the base plate 3, the needle tube drag 4 is located on the top surface of the base plate 3, a slide groove is opened at the position of the base plate 3 corresponding to the needle tube drag 4, and the bottom of the needle tube drag 4 extends to the bottom of the base plate 3 and is connected to the moving end of the push-pull mechanism 5.

[0052] In one embodiment, a pressing and fixing component 9 is disposed on the fixing platform 2 , and the pressing and fixing component 9 is used to press and fix the syringe 11 on the fixing platform 2 .

[0053] In a specific implementation, the pressing and fixing component 9 includes bosses arranged on both sides of the corresponding grooves 21 of the fixed platform 2, and also includes a pressure plate arranged between the two bosses, wherein a vertical rod body is arranged on one of the bosses, one end of the pressure plate is passed through the rod body, and an external thread can be arranged on the rod body, and one end of the pressure plate is pressed by screwing a nut; a C-shaped pressing groove is opened on the other boss, and one end of the pressure plate extends into the pressing groove, and a screw rod is spirally passed through the pressing groove, one end of the screw rod passes through the boss, and the other end extends into the pressing groove. Rotating the screw rod can press one end of the screw rod on the pressing plate, so that the pressing plate presses and fixes the syringe 11 on the fixed platform 2.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0055] It should be noted that if the embodiments of the invention involve directional indications (such as up and down), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0056] In addition, the meaning of "and / or" appearing in the full text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "multiple" means more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the invention.

Claims

1. A needle tube automatic suction and propulsion device, characterized in that: It comprises an aspiration needle tube (1), a fixing platform (2) for supporting and fixing the aspiration needle tube (1), a bottom plate (3) arranged below the fixing platform (2), a needle tube drag (4) arranged on one side of the fixing platform (2), and a push-pull mechanism (5) for driving the needle tube drag (4) to reciprocate along the length direction of the aspiration needle tube (1); The aspiration needle tube (1) comprises a needle tube (11) and a core rod (12) slidably arranged in the needle tube (11); one end of the core rod (12) of the aspiration needle tube (1) fixed on the fixed platform (2) is located outside the fixed platform (2) and extends into the needle tube drag (4), and moves together with the needle tube drag (4); the nipple on the needle tube (11) is connected to the oil discharge port of the device to be tested through a first pipeline (6); The invention also comprises a waste oil tank (7), one end of which is provided with an oil inlet, the oil inlet being connected to the first pipeline (6) via a second pipeline (8), and a first switch valve (81) is provided on the second pipeline (8) for controlling the on-off of the second pipeline (8).

2. The automatic needle aspiration and advancement device according to claim 1, characterized in that: The needle tube drag (4) comprises a sliding block (41) and a clamping seat (42) which is ball-hinged on the sliding block (41); one end of the core rod (12) is clamped in the clamping seat (42); and the push-pull mechanism (5) is connected to the sliding block (41).

3. The automatic needle aspiration and advancement device according to claim 2, characterized in that: The ball hinge of the card seat (42) and the sliding block (41) is located in the middle of the card seat (42). A plurality of elastic members (44) are evenly distributed around the ball hinge. The elastic members (44) are located between the card seat (42) and the sliding block (41) and are respectively in contact with the card seat (42) and the sliding block (41) to adjust the posture of the card seat (42).

4. The automatic needle aspiration and advancement device according to claim 1, 2 or 3, characterized in that: The fixing platform (2) is rotatably mounted on the bottom plate (3).

5. The automatic needle aspiration and advancement device according to claim 1, 2 or 3, characterized in that: The first pipeline (6) is provided with a pressure sensor (61) for detecting the pressure in the first pipeline (6) when the oil discharge port of the device to be detected is opened.

6. The automatic needle aspiration and advancement device according to claim 5, characterized in that: It also includes a control processor, which is connected to the pressure sensor (61) and the push-pull mechanism (5) and is used to prevent the push-pull mechanism (5) from starting when the pressure in the first pipeline (6) is lower than a preset pressure value.

7. The automatic needle aspiration and advancement device according to claim 6, characterized in that: The push-pull mechanism (5) is a screw-nut mechanism, and the screw is driven to rotate by a servo motor.

8. The automatic needle aspiration and advancement device according to claim 1, 2 or 3, characterized in that: A pressing and fixing component (9) is provided on the fixing platform (2), and the pressing and fixing component (9) is used to press and fix the syringe (11) on the fixing platform (2).

9. The automatic needle aspiration and advancement device according to claim 1, 2 or 3, characterized in that: A groove (21) for supporting the syringe (11) is arranged at a position of the fixed platform (2) corresponding to the syringe (11), and the groove (21) is used to limit the posture of the syringe (11) relative to the fixed platform (2); one end of the syringe (11) has an end plate (111); a first clamping groove (22) is arranged at a position of the fixed platform (2) corresponding to the end plate (111); the end plate (111) is clamped in the first clamping groove (22) and is used to limit the movement of the syringe (11) along its own length direction; One end of the core rod (12) is provided with a push plate (121), and the needle tube drag (4) is provided with a second clamping groove (421). The push plate (121) is clamped in the second clamping groove (421) and moves along with the needle tube drag (4).

10. The automatic needle aspiration and advancement device according to claim 2, characterized in that: A pressing cover (43) is provided on the top of the card seat (42), and the pressing cover (43) is used to press the push plate (121) into the card seat (42) from top to bottom.

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