Automatic oil sampling device for transformer

Abstract

The invention relates to the technical field of automatic oil sampling, and discloses an automatic oil sampling device for a transformer. Comprising an oil sampler, the front surface of the oil sampler is fixedly connected with an oil pump, the input end of the oil pump is fixedly connected with an oil inlet pipe, the side surface of the oil inlet pipe is sleeved with a first electromagnetic valve, and the output end of the oil pump is fixedly connected with a discharge pipe. The second spring is attached to the surface of a friction rubber block, a sliding plate can be pulled to one side, the sliding plate can drive a connecting plate and an extrusion plate to move together, and the extrusion plate can swing with the connecting plate as the circle center to pull the first spring through movement of the connecting plate and the extrusion plate; the extrusion plate can be attached to the surface of the bolt, the bolt can be wrapped by the rubber pad, and the needle tube is not prone to shaking and shifting when oil liquid is extracted by the needle tube in cooperation with extrusion of the attaching plate.

Description

Technical Field

[0001] The invention relates to the technical field of automatic oil sampling, in particular to an automatic oil sampling device for a transformer. Background Art

[0002] Transformers play an important role in transforming, concentrating and distributing voltage and current in power systems. They are important equipment in substations. Once an accident occurs, it is not only easy to cause large-scale power outages, affecting people's normal life and production, but sometimes it will endanger personal safety and cause loss of life and property. At present, large transformers are mostly oil-immersed. The oil extraction device consists of three parts: an oil circulation device, a pipeline self-cleaning device, and an extraction device, which can automatically extract oil samples. The device has a remote start function and selects the appropriate start time and cycle according to on-site needs. The "dead oil" in the oil sampling pipeline is circulated with the oil sample in the converter body to ensure that the oil sample is new oil in the converter. It can process waste oil in the oil sampling pipeline and flow it into the waste oil tank. The device can introduce the oil sample in the oil sampling pipeline into the sampling syringe, and empty the air in the syringe through the electromagnetic three-way valve to ensure that the oil sample meets the requirements of the offline oil chromatography test; When the automatic transformer oil sampling device is in use, the oil is extracted into the needle tube by extending and retracting the hydraulic rod. Since the hydraulic rod continuously extends and retracts to extract the oil, the needle tube is prone to shaking, which affects the oil extraction effect. At the same time, when the automatic transformer oil sampling device is in use, a large number of bubbles are easily generated when the oil enters the needle tube, so it is necessary to slowly push the bubbles in the oil in the needle tube, which easily causes oil waste and improves the oil extraction efficiency. Summary of the invention

[0003] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides an automatic oil sampling device for transformers, when the needle tube is sleeved on the oil sampler, the bolt is screwed so that the clamp can be installed on the surface of the oil sampler, and the bolt is continuously screwed so that the clamp can drive the bonding plate to fit with the surface of the needle tube, and when the bonding plate is completely fitted with the surface of the needle tube, the bonding plate can squeeze the second spring, and the second spring is fitted with the surface of the friction rubber block, so that when the second spring is retracted into the interior of the hollow storage box, the friction rubber block can increase the friction force on the surface of the second spring so that the second spring can slowly enter the interior of the hollow storage box to facilitate the bonding and squeezing of the surface of the needle tube by the bonding plate, and when the clamp is installed, the slide plate can be pulled to one side so that the slide plate can drive the connecting plate and the extrusion plate to move together, and the activities of the connecting plate and the extrusion plate can be used to make the extrusion plate swing with the connecting plate as the center of the circle to pull the first spring, so that the extrusion plate can fit with the surface of the bolt The surface is fitted, and the rubber pad can wrap the bolt, and cooperate with the fitting plate to squeeze the needle tube, so that the needle tube is not easy to shake or deviate when extracting the oil. The threaded rod is twisted to connect it with the needle rod, so that the first hydraulic rod and the second hydraulic rod can push the two sets of needle rods, and the movement of the needle rod can drive the piston to slide inside the needle tube. When the piston moves, since the upper surface of the piston is open, part of the oil in the needle tube can enter the interior of the piston, so that the oil can be pushed on the surface of the bubble removal interception plate and the umbrella head, and the bubble removal interception plate can be used to intercept and remove bubbles in the oil, and the umbrella head can flip the oil to the inner wall of the needle tube, and cooperate with the bubble removal interception plate to reduce the bubbles in the oil in the needle tube, thereby reducing the oil extraction procedure and other advantages, which solves the problem that the needle tube is easy to shake when extracting oil and a large number of bubbles in the oil are difficult to eliminate.

[0004] (II) Technical solution In order to solve the above technical problems, the present invention provides the following technical solutions: comprising an oil sampler, wherein the front surface of the oil sampler is fixedly connected to an oil pump, the input end of the oil pump is fixedly connected to an oil inlet pipe, the side surface of the oil inlet pipe is sleeved with a first solenoid valve, the output end of the oil pump is fixedly connected to a discharge pipe, the side surface of the discharge pipe is sleeved with a second solenoid valve, the side surface of the discharge pipe is sleeved with a third solenoid valve, and the third solenoid valve is located on the right side of the second solenoid valve, and the side surface of the second solenoid valve is fixedly connected to a fourth solenoid valve via a three-way pipe; The front surface of the oil sampler is movably connected to a fixing plate via bolts, the side surface of the fixing plate is fixedly connected to a clamp, a needle tube is sleeved inside the clamp, the side surface of the fixing plate is slidably connected to a slide plate, the front surface of the slide plate is movably connected to a connecting plate via a bearing, the front surface of the connecting plate is movably connected to an extrusion plate via a bearing, a rubber pad is provided on the front surface of the extrusion plate, and a first spring is fixedly connected to the rear surface of the extrusion plate.

[0005] Preferably, a first hydraulic rod is fixedly connected to the front surface of the oil sampler, and a second hydraulic rod is fixedly connected to the front surface of the oil sampler.

[0006] Preferably, the output ends of the first hydraulic rod and the second hydraulic rod are both fixedly connected to a mounting plate, and the internal threads of the mounting plate are connected to a threaded rod.

[0007] Preferably, a needle is fixedly connected to the upper surface of the needle tube, and the needle is communicated with the fourth solenoid valve, and a sealing ring is provided inside the needle.

[0008] Preferably, a piston is slidably connected to the interior of the needle tube, a bubble removal interception plate is provided inside the piston, a vertical rod is provided inside the piston, and an umbrella head is fixedly connected to one end of the vertical rod away from the piston.

[0009] Preferably, a needle rod is provided on the lower surface of the piston, and the needle rod is fixedly connected to the first hydraulic rod.

[0010] Preferably, a rubber ring is provided inside the clamp, and a hollow storage box is provided on the rear surface of the rubber ring.

[0011] Preferably, a second spring is fixedly connected inside the hollow storage box, an end of the second spring away from the hollow storage box is fixedly connected to a connecting block, and a rear surface of the connecting block is fixedly connected to a bonding plate.

[0012] Preferably, a friction rubber block is provided on the inner wall of the hollow storage box, and the friction rubber block is in contact with the second spring.

[0013] Preferably, a waste oil box is provided on the front surface of the oil sampler, and the waste oil box is communicated with a pipeline connected to the second solenoid valve, and an upper guide plate and a lower guide plate arranged side by side are also provided on the oil sampler, an upper stopper is provided at the end of the upper guide plate, and a lower stopper is provided at the end of the lower guide plate, the waste oil box is located between the upper guide plate and the lower guide plate, the inner side surface of the waste oil box contacts the front surface of the oil sampler, and the outer side surface of the waste oil box contacts the upper stopper and the lower stopper, a slide groove is provided in the length direction of the upper surface of the waste oil box, an oil inlet hole is provided in the slide groove, and an exhaust hole is provided on the waste oil box on one side of the slide groove, which is connected to the first A sleeve is installed at the end of the pipeline connected to the two solenoid valves, and a joint pipe that can be vertically extended and retracted is installed in the sleeve. A limiting convex edge is provided at one end of the joint pipe located in the sleeve, and a third spring is arranged on the upper part of the limiting convex edge. A hemispherical head is provided at the end of the joint pipe extending out of the sleeve, and the bottom surface of the slide groove cooperates with the hemispherical head. The diameter of the oil inlet hole is smaller than the diameter of the hemispherical head. A sealing cover is also installed at the end of the sleeve, and the sealing cover can prevent the limiting convex edge from separating from the sleeve. The third spring always has a tendency to push the hemispherical head out of the sleeve. When the third spring is in an uncompressed state, the lower part of the hemispherical head is located in the oil inlet hole.

[0014] Compared with the prior art, the present invention provides an automatic transformer oil sampling device, which has the following beneficial effects: When the second spring is contracted into the hollow receiving box, the friction rubber block can increase the friction force on the surface of the second spring so that the second spring can slowly enter the hollow receiving box to facilitate the bonding and extrusion of the surface of the needle tube by the bonding plate. When the fixture is installed, the slide plate can be pulled to one side so that the slide plate can drive the connecting plate and the extrusion plate to move together. The activities of the connecting plate and the extrusion plate can be used to swing the extrusion plate with the connecting plate as the center of the circle to pull the first spring so that the extrusion plate can be bonded with the surface of the bolt, and the rubber pad can wrap the bolt to cooperate with the bonding plate to squeeze the needle tube, so that the needle tube is not easy to shake or deviate when extracting oil.

[0015] 2. The present invention twists the threaded rod to connect it with the needle rod, so that the first hydraulic rod and the second hydraulic rod can push the two groups of needle rods. The movement of the needle rod can drive the piston to slide inside the needle tube. When the piston moves, since the upper surface of the piston is open, part of the oil in the needle tube can enter the interior of the piston, so that the oil can be pushed on the surface of the bubble removal interception plate and the umbrella head. The bubble removal interception plate can intercept and remove bubbles in the oil, and the umbrella head can flip the oil toward the inner wall of the needle tube to cooperate with the bubble removal interception plate to reduce the bubbles in the oil in the needle tube, thereby reducing the oil extraction procedure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the rear view structure of the clamp of the present invention; Figure 3 This is a schematic diagram of the structure of the skateboard of the present invention; Figure 4 This is a schematic diagram of the disassembled structure of the hollow storage box of the present invention; Figure 5 This is a schematic diagram of the rear view structure of the hollow storage box of the present invention; Figure 6 This is a schematic diagram of the needle tube disassembly structure of the present invention; Figure 7 This is a schematic diagram of the structure of the first hydraulic rod of the present invention; Figure 8 is a partial view of the waste oil box disposed between the guide plates; Fig. 9 yes Figure 8An enlarged view of the AA section view; Fig.10 It is a structural diagram of the waste oil box.

[0017] Among them: 1. Oil sampler; 2. Fourth solenoid valve; 3. Second solenoid valve; 4. Oil pump; 5. Third solenoid valve; 6. Needle tube; 7. First solenoid valve; 8. Clamp; 9. Oil inlet pipe; 10. Discharge pipe; 11. Waste oil box; 12. First hydraulic rod; 13. Second hydraulic rod; 14. Bolt; 15. Slide plate; 16. Fixing plate; 17. Rubber ring; 18. Hollow storage box; 19. Laminating plate; 20. Connecting block; 21. Second spring; 22. Connecting plate; 23. First spring; 24. Rubber ring; Rubber pad; 25, extrusion plate; 26, needle; 27, umbrella head; 28, piston; 29, needle rod; 30, bubble removal interception plate; 31, vertical rod; 32, friction rubber block; 33, mounting plate; 34, threaded rod; 35, sealing ring; 36, upper guide plate; 37, lower guide plate; 38, slide groove; 39, oil inlet hole; 40, exhaust hole; 41, sleeve; 42, joint pipe; 43, third spring; 44, hemispherical head; 45, cover; 46, limiting convex edge; 47, upper stopper; 48, lower stopper. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-7, including an oil sampler 1, the front surface of the oil sampler 1 is fixedly connected to an oil pump 4, the input end of the oil pump 4 is fixedly connected to an oil inlet pipe 9, the side surface of the oil inlet pipe 9 is sleeved with a first solenoid valve 7, the output end of the oil pump 4 is fixedly connected to a discharge pipe 10, the side surface of the discharge pipe 10 is sleeved with a second solenoid valve 3, the side surface of the discharge pipe 10 is sleeved with a third solenoid valve 5, and the third solenoid valve 5 is located on the right side of the second solenoid valve 3, the side surface of the second solenoid valve 3 is fixedly connected to a fourth solenoid valve 2 through a three-way pipe, and a waste oil box 11 is arranged on the front surface of the oil sampler 1, and the waste oil box 11 is connected to the waste oil box 11. The pipeline connected to the second solenoid valve 3 is interconnected, the front surface of the oil sampler 1 is fixedly connected to the first hydraulic rod 12, the front surface of the oil sampler 1 is fixedly connected to the second hydraulic rod 13, the output ends of the first hydraulic rod 12 and the second hydraulic rod 13 are fixedly connected to the mounting plate 33, the internal thread of the mounting plate 33 is connected to the threaded rod 34, the upper surface of the needle tube 6 is fixedly connected to the needle 26, and the needle 26 is interconnected with the fourth solenoid valve 2. When the oil enters the oil extraction device, it first passes through the first solenoid valve 7, an observation window is provided to observe the flow of the oil, and the oil pump 4 is used to pump oil.After the oil passes through the oil pump 4, it enters a three-way valve. On the right side of the three-way valve is a reverse flow valve to stabilize the oil pressure balance during the entire oil extraction process. There is an exhaust valve at the bottom to exhaust air to control the return oil, so that the oil flows into the transformer return valve. After the oil sample is extracted, a small amount of oil will remain between the third solenoid valve 5, the second solenoid valve 3 and the connected four-way valve, so that the remaining oil is processed and the oil remaining in the pipeline flows into the waste oil tank. The waste oil tank has a liquid level display, which can show the amount of oil in the waste oil tank and can be discharged in time. During the operation of the oil pump 4, the first solenoid valve 7, the second solenoid valve 3, and the third solenoid valve are opened by the oil pump 4, so that the remaining oil in the pipeline flows into the waste oil tank. When the oil pump 4 starts working, the first solenoid valve 7, the third solenoid valve 5 and the second solenoid valve 3 are energized, and the electric hydraulic push rod is extended and retracted to make the oil flow to the corresponding needle tube 6 for sampling. The interior of the needle 26 is provided with a sealing ring 35, and the interior of the needle tube 6 is slidably connected with a piston 28, and the interior of the piston 28 is provided with The bubble removal interception plate 30 and the piston 28 are provided with a vertical rod 31 inside. The end of the vertical rod 31 away from the piston 28 is fixedly connected with the umbrella head 27. The lower surface of the piston 28 is provided with a needle rod 29, and the needle rod 29 is fixedly connected to the first hydraulic rod 12. The threaded rod 34 is screwed to connect it with the needle rod 29, so that the first hydraulic rod 12 and the second hydraulic rod 13 can push the two groups of needle rods 29. The movement of the needle rod 29 can drive the piston 28 to slide inside the needle tube 6. When the piston 28 is moving, since the upper surface of the piston 28 is open, part of the oil in the needle tube 6 can enter the interior of the piston 28, so that the oil can be pushed on the surface of the bubble removal interception plate 30 and the umbrella head 27. The bubble removal interception plate 30 can be used to intercept and remove bubbles in the oil, and the umbrella head 27 can flip the oil toward the inner wall of the needle tube 6 to cooperate with the bubble removal interception plate 30 so that it can reduce the bubbles in the oil in the needle tube 6, thereby reducing the oil extraction process.

[0020] The front surface of the oil sampler 1 is movably connected to a fixing plate 16 through a bolt 14, and a clamp 8 is fixedly connected to the side surface of the fixing plate 16. The needle tube 6 is sleeved inside the clamp 8. The side surface of the fixing plate 16 is slidably connected to a slide plate 15. The front surface of the slide plate 15 is movably connected to a connecting plate 22 through a bearing. The front surface of the connecting plate 22 is movably connected to an extrusion plate 25 through a bearing. The front surface of the extrusion plate 25 is provided with a rubber pad 24, and the rear surface of the extrusion plate 25 is fixedly connected to a first spring 23. The inside of the clamp 8 is provided with a rubber pad. The hollow storage box 18 is provided on the rear surface of the rubber ring 17, and the second spring 21 is fixedly connected to the interior of the hollow storage box 18. The end of the second spring 21 away from the hollow storage box 18 is fixedly connected to the connecting block 20, and the rear surface of the connecting block 20 is fixedly connected to the fitting plate 19. The inner wall of the hollow storage box 18 is provided with a friction rubber block 32, and the friction rubber block 32 fits with the second spring 21. When the needle tube 6 is sleeved on the oil sampler 1, the bolt 14 is screwed so that the clamp 8 can be installed on the surface of the oil sampler 1. By continuously turning the bolt 14, the clamp 8 can drive the laminating plate 19 to fit with the surface of the needle tube 6. When the laminating plate 19 is completely in contact with the surface of the needle tube 6, the laminating plate 19 can squeeze the second spring 21. The second spring 21 fits with the surface of the friction rubber block 32, so that when the second spring 21 is retracted into the interior of the hollow storage box 18, the friction rubber block 32 can increase the friction force on the surface of the second spring 21, so that the second spring 21 can slowly enter the interior of the hollow storage box 18, which is convenient for the laminating plate 19 to fit the surface of the needle tube 6. Surface fitting and extrusion. When the fixture 8 is installed, the slide plate 15 can be pulled to one side so that the slide plate 15 can drive the connecting plate 22 and the extrusion plate 25 to move together. By utilizing the activities of the connecting plate 22 and the extrusion plate 25, the extrusion plate 25 can swing with the connecting plate 22 as the center to pull the first spring 23, so that the extrusion plate 25 can fit the surface of the bolt 14, and the rubber pad 24 can wrap the bolt 14, and cooperate with the fitting plate 19 to squeeze the needle tube 6, so that the needle tube 6 is not easy to shake or deviate when extracting oil.

[0021] When in use, use the timer to control the desired number of cycles, open the first solenoid valve 7 and the second solenoid valve 3, and make the oil pump 4 run. The second solenoid valve 3 and the fourth solenoid valve 2 are closed for 20 minutes and then fully closed. Cycle twice a day and insert the needle tube 6 into the oil extraction port. The oil pump 4 runs, and the first solenoid valve 7, the second solenoid valve 3, the third solenoid valve 5 and the fourth solenoid valve 2 are opened. After 5 seconds of timing, the first hydraulic rod 12 and the second hydraulic rod 13 move downward, and the needle tube 6 extracts about 20ml. The first hydraulic rod 12 and the fourth solenoid valve 2 are closed for 20 minutes and then fully closed. The second hydraulic rod 13 moves upward, pushing 15ml first, leaving 5ml, the first hydraulic rod 12 and the second hydraulic rod 13 move downward, and then draw 20ml, the first hydraulic rod 12 and the second hydraulic rod 13 move upward to empty the oil in the needle tube 6, the first solenoid valve 7, the second solenoid valve 3, the third solenoid valve 5 and the fourth solenoid valve 2 are closed, and the needle tube 6 is directly taken out, or the button on the oil extraction device is operated to take the needle tube 6, and the two oil pipes extract oil at the same time, ensuring one main and one backup, convenient and fast, manual oil extraction processing. Use 4 buttons to correspond to two oil sample extraction systems respectively. When manually taking oil, the pipeline must be self-cleaned, and the two oil pipes have two extraction and push buttons respectively. To control the amount of oil pumped, the threaded rod 34 is twisted to connect it with the needle rod 29, so that the first hydraulic rod 12 and the second hydraulic rod 13 can push the two sets of needle rods 29, and the movement of the needle rod 29 can drive the piston 28 to slide inside the needle tube 6. When the piston 28 moves, since the upper surface of the piston 28 is open, part of the oil in the needle tube 6 can enter the interior of the piston 28, so that the oil can be pushed on the surface of the bubble removal interception plate 30 and the umbrella head 27. The bubble removal interception plate 30 can be used to intercept and remove bubbles in the oil, and the umbrella head 27 can flip the oil to the inner wall of the needle tube 6 to cooperate with the bubble removal interception plate 30 to reduce the bubbles in the oil in the needle tube 6. When the needle tube 6 is sleeved on the oil sampler 1, the bolt 14 is twisted to install the clamp 8 on the surface of the oil sampler 1. By continuously twisting the bolt 14, the clamp 8 can be driven The movable laminating plate 19 is fitted with the surface of the needle tube 6. When the laminating plate 19 is completely fitted with the surface of the needle tube 6, the laminating plate 19 can squeeze the second spring 21. The second spring 21 is fitted with the surface of the friction rubber block 32, so that when the second spring 21 is retracted into the interior of the hollow storage box 18, the friction rubber block 32 can increase the friction force on the surface of the second spring 21 so that the second spring 21 can slowly enter the interior of the hollow storage box 18 to facilitate the laminating plate 19 to squeeze the surface of the needle tube 6. When the clamp 8 is installed, the slide plate 15 can be pulled to one side so that the slide plate 15 can drive the connecting plate 22 and the squeezing plate 25 to move together. The movement of the connecting plate 22 and the squeezing plate 25 can be used to swing the squeezing plate 25 with the connecting plate 22 as the center to pull the first spring 23, so that the squeezing plate 25 can fit the surface of the bolt 14, and the rubber pad 24 can wrap the bolt 14.

[0022] Furthermore, in order to prevent the oil from leaking and contaminating the equipment when replacing the waste oil box 11, Figure 8-10 As shown, the oil sampler 1 is also provided with an upper guide plate 36 and a lower guide plate 37 arranged side by side, an upper stopper 47 is provided at the end of the upper guide plate 36, and a lower stopper 48 is provided at the end of the lower guide plate 37. The waste oil box 11 is located between the upper guide plate 36 and the lower guide plate 37. The inner side of the waste oil box 11 contacts the front surface of the oil sampler 1, and the outer side of the waste oil box 11 contacts the upper stopper 47 and the lower stopper 48. The setting of the two guide plates can provide guidance for the replacement movement of the waste oil box 11, and the setting of the upper and lower stoppers can realize the installation limit of the waste oil box 11, so as to prevent the waste oil box 11 from directly detaching from between the upper and lower guide plates to the outside when replacing.

[0023] A slide groove 38 is provided in the length direction of the upper surface of the waste oil box 11, an oil inlet hole 39 is provided in the slide groove 38, and an exhaust hole 40 is provided on the waste oil box 11 on one side of the slide groove 38. The exhaust hole 40 is provided to facilitate the discharge of internal air during oil filling, so as to realize the normal oil receiving operation of the waste oil box 11.

[0024] A sleeve 41 is installed at the end of the pipeline connected to the second solenoid valve 3, and a joint pipe 42 that can be vertically retracted is installed in the sleeve 41. A limiting convex edge 46 is provided at one end of the joint pipe 42 located in the sleeve 41, and a third spring 43 is arranged on the upper part of the limiting convex edge 46. A hemispherical head 44 is provided at the end of the joint pipe 42 extending out of the sleeve 41. The bottom surface of the slide groove 38 cooperates with the hemispherical head 44. The diameter of the oil inlet hole 39 is smaller than the diameter of the hemispherical head 44. A cover 45 is also installed at the end of the sleeve 41. The cover 45 can prevent the limiting convex edge 46 from separating from the sleeve 41, wherein the third spring 43 always has a tendency to push the hemispherical head 44 out of the sleeve 41. When the third spring 43 is in an uncompressed state, the lower part of the hemispherical head 44 is located in the oil inlet hole 39.

[0025] When the waste oil box 11 is in normal use, a part of the lower part of the hemispherical head 44 is located in the oil inlet hole 39. While achieving relative positioning, the oil can enter the waste oil box 11 through the pipe connected to the second solenoid valve 3. When the waste oil box 11 is about to be full of oil and needs to be replaced, a new waste oil box 11 is pushed in between the guide plates and contacts the waste oil box 11 containing oil, so that the slide grooves 38 on the two waste oil boxes 11 are connected to each other, and then the new waste oil box 11 is pushed to move, and the circumference of the oil inlet hole 39 is aligned with the hemispherical head 44. The hemispherical head 44 contacts the oil inlet hole 39, and in the process of continuing to move, the elastic force of the third spring 43 is overcome to separate the hemispherical head 44 from the oil inlet hole 39 and fall to the bottom position of the slide groove 38. Since the bottom of the slide groove 38 is adapted to the hemispherical head 44, there will be no oil leakage. As the oil inlet hole 39 on the new waste oil box 11 moves to the position of the hemispherical head 44, under the elastic force of the third spring 43, the bottom of the hemispherical head 44 can re-enter the oil inlet hole 39, thereby completing the drip-free replacement of the waste oil box 11. The oil inlet pipe 9 and the discharge pipe 10 are located on the inner side of the guide plate and will not interfere with the movement of the waste oil box 11.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A transformer automatic oil sampling device, comprising an oil sampler (1), characterized in that: The front surface of the oil sampler (1) is fixedly connected to an oil pump (4), the input end of the oil pump (4) is fixedly connected to an oil inlet pipe (9), the side surface of the oil inlet pipe (9) is sleeved with a first solenoid valve (7), the output end of the oil pump (4) is fixedly connected to a discharge pipe (10), the side surface of the discharge pipe (10) is sleeved with a second solenoid valve (3), the side surface of the discharge pipe (10) is sleeved with a third solenoid valve (5), and the third solenoid valve (5) is located on the right side of the second solenoid valve (3), and the side surface of the second solenoid valve (3) is fixedly connected to a fourth solenoid valve (2) via a three-way pipe; The front surface of the oil sampler (1) is movably connected to a fixing plate (16) via bolts (14); the side surface of the fixing plate (16) is fixedly connected to a clamp (8); a needle tube (6) is sleeved inside the clamp (8); the side surface of the fixing plate (16) is slidably connected to a slide plate (15); the front surface of the slide plate (15) is movably connected to a connecting plate (22) via a bearing; the front surface of the connecting plate (22) is movably connected to an extrusion plate (25) via a bearing; a rubber pad (24) is provided on the front surface of the extrusion plate (25); and a first spring (23) is fixedly connected to the rear surface of the extrusion plate (25).

2. The automatic transformer oil sampling device according to claim 1 is characterized in that: A first hydraulic rod (12) is fixedly connected to the front surface of the oil sampler (1), and a second hydraulic rod (13) is fixedly connected to the front surface of the oil sampler (1).

3. The automatic transformer oil sampling device according to claim 2 is characterized in that: The output ends of the first hydraulic rod (12) and the second hydraulic rod (13) are both fixedly connected to a mounting plate (33), and the internal threads of the mounting plate (33) are connected to a threaded rod (34).

4. The automatic transformer oil sampling device according to claim 1 is characterized in that: A needle head (26) is fixedly connected to the upper surface of the needle tube (6), and the needle head (26) is in communication with the fourth solenoid valve (2), and a sealing ring (35) is provided inside the needle head (26).

5. The automatic transformer oil sampling device according to claim 1 is characterized in that: The needle tube (6) is slidably connected to a piston (28), a bubble removal interception plate (30) is arranged inside the piston (28), a vertical rod (31) is arranged inside the piston (28), and an umbrella head (27) is fixedly connected to one end of the vertical rod (31) away from the piston (28).

6. The automatic transformer oil sampling device according to claim 5 is characterized in that: A needle rod (29) is provided on the lower surface of the piston (28), and the needle rod (29) is fixedly connected to the first hydraulic rod (12).

7. The automatic transformer oil sampling device according to claim 1 is characterized in that: A rubber ring (17) is provided inside the clamp (8), and a hollow storage box (18) is provided on the rear surface of the rubber ring (17).

8. The automatic transformer oil sampling device according to claim 7 is characterized in that: A second spring (21) is fixedly connected inside the hollow storage box (18), an end of the second spring (21) away from the hollow storage box (18) is fixedly connected to a connection block (20), and a rear surface of the connection block (20) is fixedly connected to a bonding plate (19).

9. The automatic transformer oil sampling device according to claim 7, characterized in that: The inner wall of the hollow storage box (18) is provided with a friction rubber block (32), and the friction rubber block (32) is in contact with the second spring (21).

10. The automatic transformer oil sampling device according to claim 1, characterized in that: The front surface of the oil sampler (1) is provided with a waste oil box (11), and the waste oil box (11) is communicated with a pipeline connected to the second solenoid valve (3). The oil sampler (1) is also provided with an upper guide plate (36) and a lower guide plate (37) arranged side by side. An upper stopper (47) is provided at the end of the upper guide plate (36), and a lower stopper (48) is provided at the end of the lower guide plate (37). The waste oil box (11) is located between the upper guide plate (36) and the lower guide plate (37). The inner side surface of the waste oil box (11) contacts the front surface of the oil sampler (1), and the outer side surface of the waste oil box (11) contacts the upper stopper (47) and the lower stopper (48). A slide groove (38) is provided in the length direction of the upper surface of the waste oil box (11), and an oil inlet hole (39) is provided in the slide groove (38). An exhaust hole (40) is provided on the waste oil box (11) on one side of the slide groove (38) to communicate with the second solenoid valve ( 3) A sleeve (41) is installed at the end of the connected pipe, and a joint pipe (42) capable of vertical expansion and contraction is installed in the sleeve (41). One end of the joint pipe (42) located in the sleeve (41) is provided with a limiting convex edge (46), and a third spring (43) is arranged on the upper part of the limiting convex edge (46). One end of the joint pipe (42) extending out of the sleeve (41) is provided with a hemispherical head (44), and the bottom surface of the slide groove (38) is matched with the hemispherical head (44). The diameter of the oil inlet hole (39) is smaller than the diameter of the hemispherical head (44). A cover (45) is also installed at the end of the sleeve (41). The cover (45) can prevent the limiting convex edge (46) from being separated from the sleeve (41), wherein the third spring (43) always has a tendency to push the hemispherical head (44) out of the sleeve (41). When the third spring (43) is in an uncompressed state, the lower part of the hemispherical head (44) is located in the oil inlet hole (39).

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