Automatic replacement oil sample adding device of headspace bottle for insulating oil

Abstract

The utility model relates to the field of material analysis, in particular to an automatic replacement oil sample adding device of a headspace bottle for insulating oil, which comprises a replacement main machine, a sample introduction main machine is arranged in front of the replacement main machine, an oil sample injection assembly is arranged on the sample introduction main machine, and a rotating disc is rotationally mounted at the upper end of the replacement main machine. The headspace bottle body is placed in the placing groove by replacing gas in the headspace bottle body, the rotating disc is driven by the servo motor to rotate to a designated position, then the stepping motor is started to enable the synchronous belt wheel to rotate, the lead screw body is driven to rotate, the ball screw pair is made to move in the vertical direction, and the short needle and the long needle are driven to move downwards. At the moment, the compression spring is compressed, the headspace bottle body is pressed and fixed, the short needle and the long needle sequentially penetrate through the rubber plug of the headspace bottle body and are inserted into the bottle, gas enters the bottommost part of the headspace bottle body through the long needle and then is exhausted from the headspace bottle body through the short needle, and therefore it is guaranteed that the air in the headspace bottle body is fully replaced, and then the gas can be detected through detection equipment.

Description

Technical Field

[0001] The utility model belongs to the field of material analysis, and in particular relates to an automatic oil sample adding device for replacing a headspace bottle for insulating oil. Background Art

[0002] In the power system, insulating oil is widely used in electrical components such as transformers and switchgear to provide cooling, lubrication and insulation functions. The quality of insulating oil is directly related to the safety and stable operation of electrical equipment. In order to ensure the safe operation of electrical equipment, it is necessary to regularly test the quality of insulating oil to monitor its deterioration.

[0003] At present, headspace gas chromatography, as one of the detection methods for dissolved gas in insulating oil, has been increasingly applied. When using the headspace method to detect dissolved gas components in insulating oil, it is first necessary to fully replace the headspace bottle to eliminate the influence of air on the detection results, and then it is necessary to quantitatively transfer the oil sample to be tested into the headspace bottle. Currently, these two steps are manually completed, and the process is extremely cumbersome and requires a lot of manpower. The headspace bottle replacement equipment in the prior art is usually difficult to quickly and automatically complete the replacement of multiple headspace bottles, and cannot complete the quantitative transfer and addition of insulating oil, and the detection accuracy of dissolved gas in the headspace bottle is insufficient.

[0004] Therefore, an automatic replacement oil sample adding device for a headspace bottle for insulating oil is proposed, which can quickly and automatically complete the controlled replacement in multiple headspace bottles, can complete the quantitative transfer and addition of insulating oil, and has good accuracy in detecting dissolved gas in the headspace bottle. Utility Model Content

[0005] In order to overcome the problems that the head space bottle replacement equipment in the prior art is usually difficult to quickly and automatically complete the replacement of multiple head space bottles, cannot complete the quantitative transfer and addition of insulating oil, and the detection accuracy of dissolved gas in the head space bottle is insufficient, therefore, an automatic replacement oil sample adding device for head space bottles for insulating oil is proposed.

[0006] The technical scheme of the utility model is: an automatic replacement oil sample adding device for a headspace bottle for insulating oil, comprising a replacement main unit; a sample injection main unit is arranged in front of the replacement main unit, an oil sample injection assembly is arranged on the sample injection main unit, a rotating disk is rotatably installed on the upper end of the replacement main unit, a uniformly distributed placement groove is opened on the upper end of the rotating disk, a headspace bottle body is placed on the inner wall of the placement groove, a rubber plug is fixedly connected to the upper inner wall of the headspace bottle body, a support plate is fixedly connected to the upper end of the support plate, a fixing frame is arranged on the fixing frame, a servo motor is arranged on the fixing frame, the upper end of the output shaft of the servo motor passes through the support plate and is fixedly connected to the lower end of the rotating disk, and a double needle mechanism is arranged on the support plate;

[0007] The double-needle mechanism includes a short needle, a long needle, a compression spring, a top space bottle clamping block, an air pipe, an air inlet end, a through hole and an air outlet end; a lifting assembly is fixedly connected to the upper end of the replacement main unit, an air pipe is installed on the lifting assembly, a short needle and a long needle are fixedly connected to the lower end of the air pipe, a top space bottle clamping block is fixedly connected to the upper end of the lower half of the fixed bracket, two compression springs are fixedly connected to the upper end of the top space bottle clamping block, and the upper end of the compression spring is fixedly connected to the lower end of the air pipe.

[0008] Preferably, the lifting assembly includes a screw body, a fixed bracket, a stepper motor, a synchronous pulley, a synchronous belt body, a rotating column, a ball screw pair and a connecting block; the upper end of the replacement mainframe is fixedly connected to the fixed bracket, the side end of the fixed bracket is fixedly connected to the stepper motor, the upper end of the fixed bracket is rotatably mounted with two synchronous pulleys, the two synchronous pulleys are rotatably connected through the synchronous belt body, the upper end of the output shaft of the stepper motor is fixedly connected to the lower end of the rotating shaft of one of the synchronous pulleys, the fixed bracket is U-shaped, the lower end of the other synchronous pulley passes through the upper end of the fixed bracket and is fixedly connected to the rotating column, the lower end of the rotating column is fixedly connected to the screw body, the lower end of the screw body is rotatably mounted on the inner wall of the lower end of the fixed bracket, the side wall of the screw body is movably mounted with a ball screw pair, the side wall of the ball screw pair is fixedly connected with a connecting block, the side end of the connecting block is fixedly connected to an air pipe, a display screen is provided on the upper left end of the replacement mainframe, and the length of the short needle is smaller than that of the long needle.

[0009] Preferably, two through holes are formed through the upper and lower ends of the headspace bottle pressing block, and the lower end of the compression spring is fixedly connected to two guide posts, and the side walls of the guide posts are in contact with the inner walls of the through holes.

[0010] Preferably, the oil sample injection assembly includes an oil sample syringe, an oil extraction multi-position valve, an oil sample six-way valve, a quantitative ring, a three-way valve, a sampling pump, a flow regulator, a connecting pipe, a gas solenoid valve and a gas pressure regulator; the interior of the sampling host is equipped with an oil sample syringe, an oil extraction multi-position valve, an oil sample six-way valve, a quantitative ring, a three-way valve, a sampling pump, a flow regulator, a connecting pipe, a gas solenoid valve and a gas pressure regulator.

[0011] Preferably, the oil sample syringe is connected to the oil extraction multi-position valve pipeline, and the oil extraction multi-position valve is connected to the oil sample six-way valve pipeline.

[0012] Preferably, the oil sample six-way valve is connected to the three-way valve pipeline through a quantitative ring, and the three-way valve is connected to the sampling pump pipeline.

[0013] Preferably, the sampling pump and the flow regulator are connected by a pipeline, the flow regulator and the air outlet pipe are connected by a pipeline, the air inlet end and the connecting pipe are connected by a pipeline, the connecting pipe and the gas solenoid valve are connected by a pipeline, and the gas solenoid valve and the gas pressure regulator are connected by a pipeline.

[0014] Preferably, a plurality of syringe supports are fixedly connected to the rear end of the injection mainframe, and the oil sample syringes are placed on the syringe supports.

[0015] The beneficial effects of the utility model are as follows: by replacing the gas in the headspace bottle body, the headspace bottle body is placed in the placement groove, the rotating disk is driven by the servo motor to rotate to the specified position, and then the stepping motor is turned on to rotate the synchronous pulley, driving the screw body to rotate, so that the ball screw pair moves in the vertical direction, driving the short needle and the long needle to move downward, at this time the compression spring is compressed, and the headspace bottle body is pressed and fixed, the short needle and the long needle are successively inserted into the bottle through the rubber stopper of the headspace bottle body, the gas enters the bottom of the headspace bottle body through the long needle, and is then discharged from the headspace bottle body by the short needle, thus ensuring the full replacement of the air in the headspace bottle body, and then the gas can be detected by the detection equipment, and when the replacement is completed, the double needles are driven back to the initial position by the motor and the remaining components, which solves the problems that the headspace bottle replacement equipment in the prior art is usually difficult to quickly and automatically complete the replacement of multiple headspace bottles, cannot complete the quantitative transfer and addition of insulating oil, and the detection accuracy of the dissolved gas in the headspace bottle is insufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 What is shown is a three-dimensional structural schematic diagram of an automatic oil sample addition device for replacing a headspace bottle for insulating oil of the utility model;

[0017] Figure 2 Shown is a side view of a double-needle mechanism of an automatic oil sample addition device for replacing a headspace bottle for insulating oil of the utility model;

[0018] Figure 3 Shown is a three-dimensional schematic diagram of the headspace bottle of an automatic oil sample addition device for replacing a headspace bottle for insulating oil according to the utility model;

[0019] Figure 4 Shown is a three-dimensional structural schematic diagram of a syringe bracket of an automatic oil sample addition device for a headspace bottle for insulating oil of the utility model;

[0020] Figure 5 Shown is a plan view of an oil sample injection assembly of an automatic oil sample addition device for replacing a headspace bottle for insulating oil according to the utility model;

[0021] Figure 6 What is shown is a three-dimensional structural schematic diagram of a double-needle mechanism of an automatic oil sample addition device for a headspace bottle for insulating oil of the utility model;

[0022] Figure 7 What is shown is a flow chart of an automatic oil sample addition device for replacing a headspace bottle for insulating oil according to the utility model.

[0023] The markings in the attached drawings are: 1. Replacement host; 2. Display screen; 3. Injection host; 41. Oil sample syringe; 42. Oil extraction multi-position valve; 43. Oil sample six-way valve; 44. Quantitative ring; 45. Three-way valve; 46. Sampling pump; 47. Flow regulator; 48. Connecting pipe; 49. Gas solenoid valve; 410. Gas pressure regulator; 5. Support plate; 6. Double needle mechanism; 61. Short needle; 62. Long needle; 63. Compression spring; 64. Headspace bottle Clamping block; 65, screw body; 66, fixed bracket; 67, stepping motor; 68, synchronous pulley; 69, synchronous belt body; 610, rotating column; 611, ball screw pair; 612, connecting block; 613, air pipe; 614, air inlet end; 615, through hole; 616, air outlet end; 7, rotating disk; 8, placement slot; 9, headspace bottle body; 10, fixed bracket; 11, servo motor; 12, rubber plug; 13, syringe bracket. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] See also Figure 1-Figure 7 The utility model provides an embodiment: an automatic replacement oil sample adding device for a headspace bottle for insulating oil, comprising a replacement host 1; a sampling host 3 is arranged in front of the replacement host 1, and an oil sample injection assembly is arranged on the sampling host 3; a rotating disk 7 is rotatably installed on the upper end of the replacement host 1, and evenly distributed placement grooves 8 are opened on the upper end of the rotating disk 7, and a headspace bottle body 9 is placed on the inner wall of the placement groove 8, and a rubber plug 12 is fixedly connected to the upper inner wall of the headspace bottle body 9, and a support plate 5 is fixedly connected to the upper end of the support plate 5. A fixing frame 10 is arranged on the fixing frame 10, and a servo motor 11 is arranged on the fixing frame 10, and the upper end of the output shaft of the servo motor 11 passes through the support plate 5 and is fixedly connected to the lower end of the rotating disk 7, and a double needle mechanism 6 is arranged on the support plate 5;

[0026] The double-needle mechanism 6 includes a short needle 61, a long needle 62, a compression spring 63, a top space bottle clamping block 64, an air pipe 613, an air inlet end 614, a through hole 615 and an air outlet end 616; a lifting assembly is fixedly connected to the upper end of the replacement host 1, and an air pipe 613 is installed on the lifting assembly. The lower end of the air pipe 613 is fixedly connected to the short needle 61 and the long needle 62, and the upper end of the lower half of the fixed bracket 66 is fixedly connected to the top space bottle clamping block 64, and the upper end of the top space bottle clamping block 64 is fixedly connected to two compression springs 63, and the upper end of the compression spring 63 is fixedly connected to the lower end of the air pipe 613.

[0027] The lifting assembly includes a screw body 65, a fixed bracket 66, a stepper motor 67, a synchronous pulley 68, a synchronous belt body 69, a rotating column 610, a ball screw pair 611 and a connecting block 612; the upper end of the replacement host 1 is fixedly connected to a fixed bracket 66, the side end of the fixed bracket 66 is fixedly connected to a stepper motor 67, the upper end of the fixed bracket 66 is rotatably mounted with two synchronous pulleys 68, the two synchronous pulleys 68 are rotatably connected through the synchronous belt body 69, the upper end of the output shaft of the stepper motor 67 is fixedly connected to the lower end of the rotating shaft of one of the synchronous pulleys 68, and the fixed bracket 6 6 is U-shaped, the lower end of another synchronous pulley 68 passes through the upper end of the fixed bracket 66 and is fixedly connected to a rotating column 610, the lower end of the rotating column 610 is fixedly connected to a screw body 65, the lower end of the screw body 65 is rotatably mounted on the lower end inner wall of the fixed bracket 66, a ball screw pair 611 is movably mounted on the side wall of the screw body 65, a connecting block 612 is fixedly connected to the side wall of the ball screw pair 611, and an air supply pipe 613 is fixedly connected to the side end of the connecting block 612. A display screen 2 is provided on the upper left end of the replacement host 1, and the length of the short needle 61 is less than that of the long needle 62.

[0028] When in use, first, replace the gas in the headspace bottle body 9, place the headspace bottle body 9 in the placement groove 8, and the rotating disk 7 is driven by the servo motor 11 to rotate to the specified position, and then the stepping motor 67 is turned on to rotate the synchronous pulley 68, drive the screw body 65 to rotate, so that the ball screw pair 611 moves in the vertical direction, and drives the short needle 61 and the long needle 62 to move downward. At this time, the compression spring 63 is compressed, and the headspace bottle body 9 is pressed and fixed. The short needle 61 and the long needle 62 are inserted into the bottle through the rubber plug 12 of the headspace bottle body 9 in turn, and the gas enters the bottom of the headspace bottle body 9 through the long needle 62, and then is discharged from the headspace bottle body 9 by the short needle 61, thus ensuring the full replacement of the air in the headspace bottle body 9. When the replacement is completed, the double needles are driven by the motor and the remaining components to return to the initial position.

[0029] See also Figure 1 and Figure 6 In this embodiment, two through holes 615 are formed at the upper and lower ends of the top space bottle clamping block 64, and the lower end of the compression spring 63 is fixedly connected to two guide columns, and the side walls of the guide columns fit the inner walls of the through holes 615, which is conducive to the stable movement of the gas pipe 613.

[0030] See also Figure 1 , Figure 5 and Figure 7In this embodiment, the oil sample injection assembly includes an oil sample syringe 41, an oil extraction multi-position valve 42, an oil sample six-way valve 43, a quantitative ring 44, a three-way valve 45, a sampling pump 46, a flow regulator 47, a connecting pipe 48, a gas solenoid valve 49 and a gas pressure regulator 410; the interior of the sampling host 3 is provided with an oil sample syringe 41, an oil extraction multi-position valve 42, an oil sample six-way valve 43, a quantitative ring 44, a three-way valve 45, a sampling pump 46, a flow regulator 47, a connecting pipe 48, a gas solenoid valve 49 and a gas pressure regulator 410.

[0031] When the long needle 62 is injected to the bottom of the headspace bottle 9, the short needle 61 just passes through the septum and enters the bottle, ensuring full replacement of the gas in the headspace bottle;

[0032] The gas pressure regulator 410 further adjusts the gas pressure to a suitable value, and the gas solenoid valve 49 is opened. At this time, the gas flows through the long needle 62 into the head space bottle body 9 and is discharged from the short needle 61. The gas flowing through the head space bottle body 9 is further adjusted by the flow regulator 47. After the set replacement time is reached, the gas solenoid valve 49 is closed, and the short needle 61 and the long needle 62 are pulled out from the head space bottle. The above process is repeated until all the head space bottles are replaced.

[0033] In addition, the oil sample syringe 41 is placed on the syringe bracket 13 and connected to the oil extraction multi-position valve 42. At this time, the sampling pump 46 works to fill the insulating oil in the oil sample syringe 41, and the quantitative ring 44 further switches the oil sample six-way valve 43. Further, the short needle 61 and the long needle 62 are driven by the stepping motor 67, the synchronous pulley 68 and the ball screw pair 611 to pierce the rubber plug 12 of the head space bottle body 9 through the head space bottle clamping block 64 and enter the head space bottle body 9;

[0034] When the long needle 62 reaches the bottom of the headspace bottle 9, the short needle 61 just passes through the rubber stopper 12 and enters the bottle. At this time, the gas solenoid valve 49 is opened, and the insulating oil sample in the quantitative ring 44 is loaded into the headspace bottle 9 by the gas. After the oil sample in the quantitative ring 44 completely enters the headspace bottle 9, the oil sample six-way valve 43 returns to the initial position;

[0035] The short needle 61 and the long needle 62 also return to their initial positions;

[0036] The three-way valve 45 is further switched to the inert gas passage. At this time, the inert gas discharges the excess oil sample in the pipeline from the drain port on the oil extraction multi-position valve 42 in reverse, thereby preventing cross contamination of the next sample.

[0037] See also Figure 1 , Figure 5 and Figure 7 In this embodiment, the oil sample syringe 41 is connected to the oil extraction multi-position valve 42 by a pipeline, and the oil extraction multi-position valve 42 is connected to the oil sample six-way valve 43 by a pipeline, so as to facilitate the introduction of gas.

[0038] See also Figure 1 , Figure 5 and Figure 7 In this embodiment, the oil sample six-way valve 43 is connected to the three-way valve 45 through a pipeline via a quantitative ring 44, and the three-way valve 45 is connected to the sampling pump 46 through a pipeline, which facilitates the replacement of gas.

[0039] See also Figure 1 , Figure 5 and Figure 7 In this embodiment, the sampling pump 46 and the flow regulator 47 are connected by a pipeline, the flow regulator 47 and the air outlet end 616 are connected by a pipeline, the air inlet end 614 and the connecting pipe 48 are connected by a pipeline, the connecting pipe 48 and the gas solenoid valve 49 are connected by a pipeline, and the gas solenoid valve 49 and the gas pressure regulator 410 are connected by a pipeline to facilitate the flow of gas.

[0040] See also Figure 1 , Figure 5 and Figure 7 In this embodiment, a plurality of syringe brackets 13 are fixedly connected to the rear end of the injection host 3 , and the oil sample syringe 41 is placed on the syringe bracket 13 , which facilitates the rapid and stable placement of the oil sample syringe 41 .

[0041] Working principle: First, replace the gas in the headspace bottle body 9, place the headspace bottle body 9 in the placement groove 8, and the rotating disk 7 is driven by the servo motor 11 to rotate to the specified position, and then the stepper motor 67 is turned on to rotate the synchronous pulley 68, drive the screw body 65 to rotate, so that the ball screw pair 611 moves in the vertical direction, and drives the short needle 61 and the long needle 62 to move downward. At this time, the compression spring 63 is compressed, and the headspace bottle body 9 is pressed and fixed. The short needle 61 and the long needle 62 are inserted into the bottle through the rubber plug 12 of the headspace bottle body 9 in turn, and the gas enters the bottom of the headspace bottle body 9 through the long needle 62, and then is discharged from the headspace bottle body 9 by the short needle 61, so that the air in the headspace bottle body 9 is fully replaced. When the replacement is completed, the double needles are driven by the motor and other components to return to the initial position;

[0042] The short needle 61 and the long needle 62 pass through the rubber stopper 12 and enter the headspace bottle body 9. When the long needle 62 is injected to the bottom of the headspace bottle body 9, the short needle 61 just passes through the septum and enters the bottle, ensuring full replacement of the gas in the headspace bottle.

[0043] The gas pressure regulator 410 further adjusts the gas pressure to a suitable value, and the gas solenoid valve 49 is opened. At this time, the gas flows through the long needle 62 into the head space bottle body 9 and is discharged from the short needle 61. The gas flowing through the head space bottle body 9 is further adjusted by the flow regulator 47. After the set replacement time is reached, the gas solenoid valve 49 is closed, and the short needle 61 and the long needle 62 are pulled out from the head space bottle. The above process is repeated until all the head space bottles are replaced.

[0044] In addition, the oil sample syringe 41 is placed on the syringe bracket 13 and connected to the oil extraction multi-position valve 42. At this time, the sampling pump 46 works to fill the insulating oil in the oil sample syringe 41, and the quantitative ring 44 further switches the oil sample six-way valve 43. Further, the short needle 61 and the long needle 62 are driven by the stepping motor 67, the synchronous pulley 68 and the ball screw pair 611 to pierce the rubber plug 12 of the head space bottle body 9 through the head space bottle clamping block 64 and enter the head space bottle body 9;

[0045] When the long needle 62 reaches the bottom of the headspace bottle 9, the short needle 61 just passes through the rubber stopper 12 and enters the bottle. At this time, the gas solenoid valve 49 is opened, and the insulating oil sample in the quantitative ring 44 is loaded into the headspace bottle 9 by the gas. After the oil sample in the quantitative ring 44 completely enters the headspace bottle 9, the oil sample six-way valve 43 returns to the initial position;

[0046] The short needle 61 and the long needle 62 also return to their initial positions;

[0047] The three-way valve 45 is further switched to the inert gas passage. At this time, the inert gas discharges the excess oil sample in the pipeline from the drain port on the oil extraction multi-position valve 42 in reverse, thereby preventing cross contamination of the next sample.

[0048] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. An automatic oil sample addition device for replacing a headspace bottle for insulating oil, comprising a replacement host (1); characterized in that: A sampling main unit (3) is arranged in front of the replacement main unit (1), and an oil sample injection assembly is arranged on the sampling main unit (3). A rotating disk (7) is rotatably mounted on the upper end of the replacement main unit (1), and evenly distributed placement grooves (8) are opened on the upper end of the rotating disk (7). A headspace bottle body (9) is placed on the inner wall of the placement groove (8), and a rubber plug (12) is fixedly connected to the upper inner wall of the headspace bottle body (9). A support plate (5) is fixedly connected to the upper end of the replacement main unit (1), and a fixing frame (10) is fixedly connected to the lower end of the support plate (5). A servo motor (11) is arranged on the fixing frame (10), and the upper end of the output shaft of the servo motor (11) passes through the support plate (5) and is fixedly connected to the lower end of the rotating disk (7). A double needle mechanism (6) is arranged on the support plate (5); The double needle mechanism (6) comprises a short needle (61), a long needle (62), a compression spring (63), a headspace bottle pressing block (64), an air supply pipe (613), an air inlet end (614), a through hole (615) and an air outlet end (616); a lifting assembly is fixedly connected to the upper end of the replacement main unit (1), an air supply pipe (613) is installed on the lifting assembly, a short needle (61) and a long needle (62) are fixedly connected to the lower end of the air supply pipe (613), an upper end of the lower half of the fixed bracket (66) is fixedly connected to the headspace bottle pressing block (64), two compression springs (63) are fixedly connected to the upper end of the headspace bottle pressing block (64), and the upper end of the compression spring (63) is fixedly connected to the lower end of the air supply pipe (613).

2. The device for automatically replacing oil sample and adding oil sample for a headspace bottle for insulating oil according to claim 1, characterized in that: The lifting assembly comprises a screw body (65), a fixed bracket (66), a stepper motor (67), a synchronous pulley (68), a synchronous belt body (69), a rotating column (610), a ball screw pair (611) and a connecting block (612); the upper end of the replacement main machine (1) is fixedly connected to the fixed bracket (66), the side end of the fixed bracket (66) is fixedly connected to the stepper motor (67), the upper end of the fixed bracket (66) is rotatably mounted with two synchronous pulleys (68), the two synchronous pulleys (68) are rotatably connected through the synchronous belt body (69), the upper end of the output shaft of the stepper motor (67) is fixedly connected to the lower end of the rotating shaft of one of the synchronous pulleys (68), the fixed bracket ( 66) is U-shaped, the lower end of another synchronous pulley (68) passes through the upper end of the fixed bracket (66) and is fixedly connected to a rotating column (610), the lower end of the rotating column (610) is fixedly connected to a screw body (65), the lower end of the screw body (65) is rotatably mounted on the lower inner wall of the fixed bracket (66), a ball screw pair (611) is movably mounted on the side wall of the screw body (65), a connecting block (612) is fixedly connected to the side wall of the ball screw pair (611), and a gas supply pipe (613) is fixedly connected to the side end of the connecting block (612). A display screen (2) is provided on the upper left end of the replacement main unit (1), and the length of the short needle (61) is less than the length of the long needle (62).

3. The automatic oil sample addition device for replacing a headspace bottle for insulating oil according to claim 1 is characterized in that: Two through holes (615) are formed through the upper and lower ends of the headspace bottle pressing block (64); the lower end of the compression spring (63) is fixedly connected to two guide posts; the side walls of the guide posts are in contact with the inner walls of the through holes (615).

4. The device for automatically replacing oil sample and adding oil sample for a headspace bottle for insulating oil according to claim 1, characterized in that: The oil sample injection assembly comprises an oil sample syringe (41), an oil extraction multi-position valve (42), an oil sample six-way valve (43), a quantitative ring (44), a three-way valve (45), a sampling pump (46), a flow regulator (47), a connecting pipe (48), a gas solenoid valve (49) and a gas pressure regulator (410); the sampling host (3) is provided with an oil sample syringe (41), an oil extraction multi-position valve (42), an oil sample six-way valve (43), a quantitative ring (44), a three-way valve (45), a sampling pump (46), a flow regulator (47), a connecting pipe (48), a gas solenoid valve (49) and a gas pressure regulator (410).

5. The device for automatically replacing oil sample and adding oil sample for a headspace bottle for insulating oil according to claim 4, characterized in that: The oil sample injector (41) is connected to the oil extraction multi-position valve (42) through a pipeline, and the oil extraction multi-position valve (42) is connected to the oil sample six-way valve (43) through a pipeline.

6. The device for automatically replacing oil sample and adding oil sample for a headspace bottle for insulating oil according to claim 4, characterized in that: The oil sample six-way valve (43) is connected to the three-way valve (45) through a pipeline via a quantitative ring (44), and the three-way valve (45) is connected to the sampling pump (46) through a pipeline.

7. The device for automatically replacing oil sample and adding oil sample for a headspace bottle for insulating oil according to claim 4, characterized in that: The sampling pump (46) is connected to the flow regulator (47) through a pipeline, the flow regulator (47) is connected to the gas outlet (616) through a pipeline, the gas inlet (614) is connected to the connecting pipe (48) through a pipeline, the connecting pipe (48) is connected to the gas solenoid valve (49) through a pipeline, and the gas solenoid valve (49) is connected to the gas pressure regulator (410) through a pipeline.

8. The device for automatically replacing oil sample and adding oil sample for a headspace bottle for insulating oil according to claim 4, characterized in that: A plurality of syringe brackets (13) are fixedly connected to the rear end of the injection main unit (3), and the oil sample syringes (41) are placed on the syringe brackets (13).

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