An online lubricating oil analysis system for unit oil stations

Abstract

The invention discloses an online analysis system for lubricating oil for a unit oil station, comprising an oil tank and an analysis system body, a filter box is arranged in the oil tank, a first oil inlet pipeline is connected to the side of the filter box, a socket is arranged on the side of the filter box, a filter plate is inserted in the socket, an arc guide plate is fixed to the inner wall of the oil tank, an arc slide is arranged in the arc guide plate, the filter plate is connected with a slide member, a scraper is arranged in the filter box, an elastic reset component is arranged between the filter box and the arc guide plate, a recovery oil tank is arranged at the bottom of the filter box, the recovery oil tank is connected to a negative pressure device through a soft pipe, a movable pressing plate is arranged in the filter box, a driving motor is arranged at the top of the pressing plate oil tank, a screw is connected to the driving motor, a movable part is arranged on the screw, the movable part is threadedly connected to the screw, the movable part includes a guide plate, and the bottom of the movable part is connected to the movable pressing plate. When the solid particle content in the lubricating oil exceeds the set value, the oil can be automatically filtered and the filter cloth can be cleaned, thereby extending the service life and maintenance time of the filter cloth.

Description

Technical Field

[0001] The invention belongs to the technical field of unit oil stations, and in particular is an online lubricating oil analysis system for unit oil stations. Background Art

[0002] In the prior art, lubricating oil is an important means of protecting all mechanical equipment. Various mechanical units require lubricating oil for lubrication to ensure the normal operation of the mechanical equipment. After long-term use of the lubricating oil, particulate matter generated by wear of mechanical parts will be mixed into the lubricating oil, which will affect the quality of the lubricating oil. Therefore, it is necessary to use an online analysis system and set corresponding sensors to monitor the particulate matter in the lubricating oil. When it is detected that the particulate matter in the lubricating oil is too high, the lubricating oil needs to be filtered or replaced to keep the lubricating oil pure so that it can lubricate the mechanical parts normally.

[0003] After searching, the Chinese patent application No. 201710221763.2 discloses an online monitoring system for lubricating oil of a wind turbine set. The online monitoring system for lubricating oil of a wind turbine set of the present invention comprises a detection chamber for accommodating the lubricating oil in the wind turbine set; a wear detection device, which is arranged inside the detection chamber and is used to detect particulate matter in the lubricating oil flowing through the detection chamber; an oil quality detection device, which is arranged inside the detection chamber and is used to detect the oil quality of the lubricating oil flowing through the detection chamber; and a processing device for receiving and processing output signals of the wear detection device and the oil quality detection device.

[0004] The online monitoring system for lubricating oil of a wind turbine set in the above-mentioned patent has the following deficiencies: although a metal abrasive particle sensor can be provided to monitor whether the metal abrasive particles exceed the standard, there is a lack of corresponding processing mechanism to process the metal abrasive particles when the metal abrasive particles exceed the standard, so that the metal abrasive particles are mixed in the lubricating oil and affect the normal use of the lubricating oil. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an online analysis system for lubricating oil for a unit oil station. When the online analysis system for lubricating oil for a unit oil station detects that the particulate matter content in the lubricating oil is too high, it can automatically switch the oil circuit to pass through a filter to filter out the particulate matter, and can remove the filtered residue, so that the system can operate stably for a long time.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions: an online analysis system for lubricating oil for a unit oil station, comprising an oil tank and an analysis system body, the oil tank is provided with a filter box with openings at upper and lower ends, the side of the filter box is connected to a first oil inlet pipe, the side of the filter box is provided with a socket, a filter plate that can slide laterally is inserted in the socket, the filter plate comprises a frame body and a filter cloth connected to the top surface of the frame body, an arc-shaped guide plate is fixed to the inner wall of the oil tank, an arc-shaped slideway is provided in the arc-shaped guide plate, the filter plate is connected to a slide member that slides in the arc-shaped slideway, a scraper strip that abuts against the top surface of the filter plate is provided on the inner side of the filter box, an elastic reset component is provided between the filter box and the arc-shaped guide plate, a recovery oil groove with an opening aligned with the scraper strip is provided at the bottom of the filter box, a soft pipe is connected to the recovery oil groove, and the soft pipe is connected to a negative pressure The filter box is provided with a movable pressure plate that matches the inner wall seal, and the top of the oil tank is provided with a driving motor, and the driving motor is connected to a screw that passes through the filter box, and a movable part is sleeved on the screw, and the movable part is threadedly connected to the screw, and the movable part includes a guide plate that extends into a guide groove on the side of the oil tank, and the bottom of the movable part is connected to the movable pressure plate. When the driving motor rotates forward to drive the movable part to move downward, the movable pressure plate squeezes out the lubricating oil in the filter box through the filter cloth until the movable pressure plate contacts the scraper bar to drive the filter box to move downward together, and the sliding part slides in the arc slide to pull the filter plate to move sideways, and the scraper bar scrapes off the filter residue on the filter cloth and opens the opening of the oil recovery tank at the same time, and the negative pressure device sucks the filter residue into the soft pipe through the oil recovery tank and discharges it; when the driving motor is reversed, the movable pressure plate, the filter box and the filter plate are all reset. When the solid particle content in the lubricating oil exceeds the set value, the lubricating oil enters the filter box, and the solid particles are filtered out by the filter cloth at the bottom of the filter box to clean the lubricating oil. The solid particles filtered out from the filter cloth can be scraped off and sucked into the soft pipe through the recovery oil tank and discharged, thereby avoiding clogging of the filter cloth and extending the service life of the filter cloth and maintenance time.

[0007] In the above technical solution, preferably, the elastic reset assembly includes a support plate connected to the filter box, a piston cylinder with a bottom opening is fixed at the bottom of the support plate, a piston is arranged in the piston cylinder, a first spring is arranged between the piston and the top surface of the piston cylinder, a connecting rod fixedly connected to the arc guide plate is connected to the bottom of the piston, a bottom plate abutting against the recovery oil tank is arranged on the frame, a support plate with two ends fixed to the inner wall of the filter box is arranged between the bottom plate and the filter cloth, an air bag is fixed on the support plate, the air bag is connected to the piston cylinder through a ventilation hose, when the filter box moves down, the gas in the piston cylinder is squeezed into the air bag, and the air bag bulges to lift the filter cloth to close to the scraper. Since the filter cloth will bend downward after being squeezed downward by the lubricating oil, it is difficult for the scraper to scrape the surface of the filter cloth after a period of use. Through this structure, when the filter box moves down and removes the filter plate, the air in the air bag can lift the filter cloth, so that the surface of the filter cloth can be close to the scraper, so that the scraper has a better effect of scraping the filter residue.

[0008] In the above technical solution, preferably, the main body of the analysis system includes a control terminal, a second oil inlet pipe, a particle sensor and an electromagnetic three-way valve, the second oil inlet pipe is connected to the inlet of the electromagnetic three-way valve, the particle sensor is arranged on the second oil inlet pipe in front of the inlet of the electromagnetic three-way valve, one outlet of the electromagnetic three-way valve is connected to the first oil inlet pipe, and the other outlet of the electromagnetic three-way valve is connected to the oil tank through the third oil inlet pipe, and the control terminal is electrically connected to the particle sensor, the electromagnetic three-way valve, the drive motor and the negative pressure device. With this structure, the particle sensor is used to detect the particle amount in the lubricating oil passing through the second oil inlet pipe. When the particle amount exceeds the standard, the control terminal controls the electromagnetic three-way valve to output from the first oil inlet pipe to the filter box. When the particle amount does not exceed the standard, the control terminal controls the electromagnetic three-way valve to output directly from the third oil inlet pipe to the oil tank. At the same time, the control terminal is used to control the drive motor and the negative pressure device. When the lubricating oil is output from the first oil inlet pipe to the filter box, the drive motor is controlled to rotate forward and reverse continuously, and the negative pressure device is started when the filter box descends to the bottom.

[0009] In the above technical solution, preferably, a one-way valve is provided on the first oil inlet pipeline, and this structure is used to prevent the lubricating oil in the filter box from flowing back.

[0010] In the above technical solution, preferably, a mounting frame is provided on the inner wall of the oil tank, a movable rod toward the filter box is penetrated on the mounting frame, a limit stopper for blocking the filter box from descending is provided at one end of the movable rod close to the filter box, a driving block is provided at one end of the movable rod away from the filter box, a second spring is provided between the driving block and the mounting frame, a through hole is provided on the driving block, a driving rod misaligned with the center of the through hole is provided at the bottom of the guide plate, and the bottom of the driving rod is a conical portion that can be inserted into the through hole, and when the movable pressing plate descends to approach the scraper bar, the conical portion is inserted into the through hole to make the filter box break away from the limit of the limit stopper. With this structure, when the movable pressing plate presses down to filter the lubricating oil, the filter box is limited by the limit stopper, thereby ensuring that the pressure during the filter pressing is large enough, and when the movable pressing plate descends to approach the scraper bar, the conical portion is inserted into the through hole to make the filter box break away from the limit of the limit stopper, and the filter box can move down and extract the filter plate.

[0011] In the above technical solution, preferably, the negative pressure device is a diaphragm pump. The diaphragm pump as the negative pressure device can effectively generate negative pressure to absorb the lubricating oil and filter residue, and can smoothly discharge the lubricating oil and filter residue.

[0012] In the above technical solution, preferably, the scraper bar includes a fixed rod and an elastic strip connected to the bottom of the fixed rod. This structure can ensure that the scraper bar is strong enough to block the movable pressure plate and ensure its positioning stability.

[0013] In the above technical solution, preferably, a stirring paddle is provided at the bottom of the screw, and an electric heating tube is provided on the stirring paddle. With this structure, the lubricating oil can be stirred when the screw rotates, and the lubricating oil can be heated by the electric heating tube to avoid excessive viscosity of the lubricating oil.

[0014] Compared with the prior art, the present invention has the following beneficial effects: when the solid particle content in the lubricating oil of the lubricating oil online analysis system for the unit oil station exceeds a set value, the lubricating oil enters the filter box, and the solid particles are filtered out of the lubricating oil by the filter cloth at the bottom of the filter box to clean the lubricating oil, and the solid particles filtered out on the filter cloth can be scraped off and sucked into the soft pipe through the recovery oil tank and discharged, thereby avoiding clogging of the filter cloth and extending the service life of the filter cloth and the maintenance time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0016] Figure 2 It is a structural schematic diagram of the back side of an embodiment of the present invention.

[0017] Figure 3 Schematic diagram of the internal structure of an embodiment of the present invention.

[0018] Figure 4 It is a schematic diagram of the internal decomposition structure of an embodiment of the present invention.

[0019] Figure 5 Schematic diagram of the internal structure of the filter box in an embodiment of the present invention.

[0020] Figure 6 Schematic diagram of the exploded structure of the filter plate and the oil recovery tank in the embodiment of the present invention.

[0021] Figure 7 Schematic diagram of the connection structure between the airbag and the piston cylinder in an embodiment of the present invention.

[0022] Figure 8 Schematic diagram of the structure of the bottom of the filter box in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Figures 1 to 8, an online analysis system for lubricating oil for a unit oil station, comprising an oil tank 1 and an analysis system body, a filter box 2 with upper and lower ends opening is arranged in the oil tank 1, a first oil inlet pipe 3 is connected to the side of the filter box 2, a socket 4 is arranged on the side of the filter box 2, a filter plate 5 that can slide laterally is inserted in the socket 4, in this embodiment, sockets 4 are arranged on the opposite sides of the filter box 2, filter plates 5 that can slide laterally are inserted in the sockets 4 on both sides, to ensure smooth sliding of the filter plate 5, slide rails can be arranged on both sides of the socket 4, the filter plate 5 includes a frame 6 and a filter cloth 7 connected to the top surface of the frame 6, the oil tank 1 An arc-shaped guide plate 8 is fixed opposite to the inner wall, and an arc-shaped slideway 9 is arranged in the arc-shaped guide plate 8. The two filter plates 5 are respectively connected to a slide member 10 sliding in the arc-shaped slideway 9, and the slide member 10 is a rotating roller. The inner side surfaces on both sides of the filter box 2 are provided with a scraper 11 that abuts against the top surface of the filter plate 5. An elastic reset component 12 is arranged between the filter box 2 and the arc-shaped guide plate 8. Recovery oil grooves 13 with openings aligned with the scraper strips 11 are arranged on both sides of the bottom of the filter box 2. The bottom of the recovery oil groove 13 is connected to a soft pipe 14, and the soft pipe 14 is connected to a negative pressure device (not drawn in the figure). A movable pressure plate 15 is provided in the box 2 to match the inner wall seal, and a driving motor 16 is provided on the top of the oil tank 1. The output shaft of the driving motor 16 is connected to a screw 17 passing through the filter box 2 through a coupling. A movable part 18 is sleeved on the screw 17. The movable part 18 is threadedly connected to the screw 17. The movable part 18 includes a guide plate 20 extending into a guide groove 19 on the side of the oil tank 1. The bottom of the movable part 18 is connected to the movable pressure plate 15. When the filter plate 5 is not drawn out, the bottom of the filter plate 5 blocks the opening of the recovery oil tank 13. When the driving motor 16 rotates forward to drive the movable part 18 to move downward, the movable pressure plate 1 5 squeezes the lubricating oil in the filter box 2 through the filter cloth 7 until the movable pressure plate 15 contacts the scraper bar 11 to drive the filter box 2 downward together, the slide member 10 slides in the arc slideway 9 to pull the filter plate 5 to move sideways, the scraper bar 11 scrapes off the filter residue on the filter cloth 7, and at the same time opens the opening of the recovery oil tank 13, the negative pressure device sucks the filter residue into the soft pipe 14 through the recovery oil tank 13 and discharges it, and a part of the lubricating oil will be sucked out when the negative pressure device is started, and the flow of the lubricating oil brings out the filter residue scraped from the filter cloth 7; when the driving motor 16 is reversed, the movable pressure plate 15, the filter box 2 and the filter plate 5 are all reset. When the solid particle content in the lubricating oil of the lubricating oil online analysis system for the unit oil station exceeds the set value, the lubricating oil enters the filter box 2, and the solid particles are filtered out of the lubricating oil by the filter cloth 7 at the bottom of the filter box 2 to clean the lubricating oil, and the solid particles filtered out from the filter cloth 7 can be scraped off and sucked into the soft pipe 14 through the recovery oil tank 13 and discharged, thereby avoiding clogging of the filter cloth 7 and extending the service life of the filter cloth 7 and the maintenance time.

[0024] In this embodiment, the elastic reset assembly 12 includes a support plate 21 connected to the filter box 2, a piston cylinder 22 with a bottom opening is fixed at the bottom of the support plate 21, a piston 23 is arranged in the piston cylinder 22, a first spring 24 is arranged between the piston 23 and the top surface of the piston cylinder 22, a connecting rod 25 fixedly connected to the arc guide plate 8 is connected to the bottom of the piston 23, a bottom plate abutting against the recovery oil tank 13 is arranged on the frame 6, a support plate with both ends fixed to the inner wall of the filter box 2 is arranged between the bottom plate and the filter cloth 7, an air bag 26 is fixed on the support plate, the air bag 26 is connected to the piston cylinder 22 by a ventilation hose 27, when the filter box 2 moves downward, the gas in the piston cylinder 22 is squeezed into the air bag 26, and the air bag 26 bulges to lift the filter cloth 7 to be close to the scraper strip 11. Since the filter cloth 7 will have a downward curvature after being squeezed downward by the lubricating oil, it is difficult for the scraper bar 11 to scrape the surface of the filter cloth 7 after a period of use. Through this structure, when the filter box 2 moves down and removes the filter plate 5, the gas in the piston cylinder 22 is squeezed into the airbag 26. During the inflation process, the bottom of the airbag 26 is fixed on the support plate for support, and the top bulges upward, which can lift the filter cloth 7, so that the surface of the filter cloth 7 can be close to the scraper bar 11, so that the scraper bar 11 can better scrape off the filter residue.

[0025] In this embodiment, the main body of the analysis system includes a control terminal, a second oil inlet pipe 28, a particle sensor 29 and an electromagnetic three-way valve 30. The second oil inlet pipe 28 is connected to the inlet of the electromagnetic three-way valve 30. The particle sensor 29 is arranged on the second oil inlet pipe 28 in front of the inlet of the electromagnetic three-way valve 30. One outlet of the electromagnetic three-way valve 30 is connected to the first oil inlet pipeline 3, and the other outlet of the electromagnetic three-way valve 30 is connected to the oil tank 1 through the third oil inlet pipeline 31. The control terminal is electrically connected to the particle sensor 29, the electromagnetic three-way valve 30, the drive motor 16 and the negative pressure device. The particle sensor 29 can select a particle sensor 29 of any existing principle. With this structure, the particle sensor 29 is used to detect the amount of particles in the lubricating oil passing through the second oil inlet pipe 28. When the amount of particles exceeds the standard, the control terminal controls the electromagnetic three-way valve 30 to output from the first oil inlet pipe 3 to the filter box 2. When the amount of particles does not exceed the standard, the control terminal controls the electromagnetic three-way valve 30 to output from the third oil inlet pipe 31 directly to the oil tank 1. At the same time, the control terminal is used to control the drive motor 16 and the negative pressure device. When the lubricating oil is output from the first oil inlet pipe 3 to the filter box 2, the drive motor 16 is controlled to continuously rotate forward and reverse, and the negative pressure device is started when the filter box 2 descends to the bottom.

[0026] In this embodiment, a one-way valve 32 is provided on the first oil inlet pipeline 3. This structure is used to prevent the lubricating oil in the filter box 2 from flowing back.

[0027] In this embodiment, a mounting bracket 33 is provided on the inner wall of the oil tank 1, and a movable rod 34 is passed through the mounting bracket 33 toward the filter box 2. A limit stop 35 for blocking the filter box 2 from descending is provided at one end of the movable rod 34 close to the filter box 2, and a driving block 36 is provided at the end of the movable rod 34 away from the filter box 2. A second spring 37 is provided between the driving block 36 and the mounting bracket 33, and a through hole 38 is provided on the driving block 36. A driving rod 39 misaligned with the center of the through hole 38 is provided at the bottom of the guide plate 20, and the bottom of the driving rod 39 is a conical portion 40 that can be inserted into the through hole 38. When the movable pressing plate 15 descends to approach the scraper strip 11, the conical portion 40 is inserted into the through hole 38 to allow the filter box 2 to break away from the limit of the limit stop 35. This structure ensures that when the movable pressure plate 15 is pressed down to filter the lubricating oil, the filter box 2 is limited by the limit stop 35, thereby ensuring that the pressure during filtration is large enough. When the movable pressure plate 15 moves down close to the scraper bar 11, the conical portion 40 is inserted into the through hole 38 to allow the filter box 2 to break away from the limit of the limit stop 35, and the filter box 2 can move down and pull out the filter plate 5.

[0028] In this embodiment, the negative pressure device is a diaphragm pump. The diaphragm pump as the negative pressure device can effectively generate negative pressure to absorb the lubricating oil and filter residue, and can smoothly discharge the lubricating oil and filter residue.

[0029] In this embodiment, the scraper bar 11 includes a fixed rod 41 and an elastic strip 42 connected to the bottom of the fixed rod 41. The adoption of this structure can not only make the scraper bar 11 strong enough to block the movable pressing plate 15, but also ensure its positioning stability.

[0030] In this embodiment, a stirring paddle 43 is provided at the bottom of the screw 17, and an electric heating pipe 44 is provided on the stirring paddle 43. With this structure, the lubricating oil can be stirred when the screw 17 rotates, and the lubricating oil can be heated by the electric heating pipe 44 to prevent the lubricating oil from being too viscous.

[0031] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An online lubricating oil analysis system for a unit oil station, comprising an oil tank (1) and an analysis system body, characterized in that: The oil tank (1) is provided with a filter box (2) with openings at both ends, the filter box (2) is connected to a first oil inlet pipe (3) on its side, the filter box (2) is provided with a socket (4) on its side, a filter plate (5) which can slide laterally is inserted in the socket (4), the filter plate (5) comprises a frame (6) and a filter cloth (7) connected to the top surface of the frame (6), an arc-shaped guide plate (8) is fixed to the inner wall of the oil tank (1), an arc-shaped slideway (9) is provided in the arc-shaped guide plate (8), the filter plate (5) is connected to the arc-shaped guide plate (8), and a filter cloth (7) which can slide laterally is inserted in the socket (4). A sliding member (10) slides in the slideway (9), a scraper (11) is arranged on the inner side of the filter box (2) and abuts against the top surface of the filter plate (5), an elastic reset component (12) is arranged between the filter box (2) and the arc-shaped guide plate (8), a recovery oil groove (13) is arranged at the bottom of the filter box (2) and the opening is aligned with the scraper (11), a soft pipe (14) is connected to the recovery oil groove (13), and the soft pipe (14) is connected to a negative pressure device, and a movable sealing member (14) is arranged in the filter box (2) to match the inner wall seal. A pressure plate (15), a driving motor (16) is provided on the top of the oil tank (1), the driving motor (16) is connected to a screw (17) passing through the filter box (2), a movable part (18) is sleeved on the screw (17), the movable part (18) is threadedly connected to the screw (17), the movable part (18) comprises a guide plate (20) extending into a guide groove (19) on the side of the oil tank (1), the bottom of the movable part (18) is connected to the movable pressure plate (15), and when the driving motor (16) is driven in the forward direction When the movable member (18) moves downward, the movable pressure plate (15) squeezes the lubricating oil in the filter box (2) through the filter cloth (7) until the movable pressure plate (15) contacts the scraper bar (11) to drive the filter box (2) downward together, the sliding member (10) slides in the arc-shaped slideway (9) to pull the filter plate (5) to move laterally, the scraper bar (11) scrapes off the filter residue on the filter cloth (7), and at the same time opens the opening of the recovery oil tank (13), and the negative pressure device sucks the filter residue into the soft pipe (14) through the recovery oil tank (13) and discharges it; When the driving motor (16) rotates in the reverse direction, the movable pressing plate (15), the filter box (2) and the filter plate (5) are all reset.

2. The lubricating oil online analysis system for a unit oil station according to claim 1, characterized in that: The elastic reset assembly (12) comprises a support plate (21) connected to the filter box (2); a piston cylinder (22) with a bottom opening is fixed to the bottom of the support plate (21); a piston (23) is arranged in the piston cylinder (22); a first spring (24) is arranged between the piston (23) and the top surface of the piston cylinder (22); a connecting rod (25) fixedly connected to the arc-shaped guide plate (8) is connected to the bottom of the piston (23); and a connecting rod (25) fixedly connected to the recovered oil is arranged on the frame (6). A bottom plate abutting against the groove (13) is provided between the bottom plate and the filter cloth (7), and a support plate with both ends fixed to the inner wall of the filter box (2). An air bag (26) is fixed on the support plate. The air bag (26) is connected to the piston cylinder (22) through a ventilation hose (27). When the filter box (2) moves downward, the gas in the piston cylinder (22) is squeezed into the air bag (26), and the air bag (26) swells to lift the filter cloth (7) until it is in close contact with the scraper strip (11).

3. The lubricating oil online analysis system for a unit oil station according to claim 1, characterized in that: The main body of the analysis system comprises a control terminal, a second oil inlet pipe (28), a particle sensor (29) and an electromagnetic three-way valve (30); the second oil inlet pipe (28) is connected to the inlet of the electromagnetic three-way valve (30); the particle sensor (29) is arranged on the second oil inlet pipe (28) in front of the inlet of the electromagnetic three-way valve (30); one outlet of the electromagnetic three-way valve (30) is connected to the first oil inlet pipe (3); the other outlet of the electromagnetic three-way valve (30) is connected to the oil tank (1) via a third oil inlet pipe (31); the control terminal is electrically connected to the particle sensor (29), the electromagnetic three-way valve (30), the drive motor (16) and the negative pressure device.

4. The lubricating oil online analysis system for a unit oil station as claimed in claim 3, characterized in that: A one-way valve (32) is provided on the first oil inlet pipeline (3).

5. The lubricating oil online analysis system for a unit oil station as claimed in claim 1, characterized in that: The inner wall of the oil tank (1) is provided with a mounting frame (33), the mounting frame (33) is provided with a movable rod (34) extending toward the filter box (2), an end of the movable rod (34) close to the filter box (2) is provided with a limit stopper (35) for blocking the filter box (2) from moving downward, an end of the movable rod (34) away from the filter box (2) is provided with a driving block (36), and a second spring (36) is provided between the driving block (36) and the mounting frame (33). 37), a through hole (38) is provided on the driving block (36), a driving rod (39) offset from the center of the through hole (38) is provided at the bottom of the guide plate (20), and the bottom of the driving rod (39) is a conical portion (40) that can be inserted into the through hole (38), and when the movable pressing plate (15) moves downward to approach the scraper bar (11), the conical portion (40) is inserted into the through hole (38) to enable the filter box (2) to break away from the limit of the limit block (35).

6. The lubricating oil online analysis system for a unit oil station according to claim 1, characterized in that: The negative pressure device is a diaphragm pump.

7. The lubricating oil online analysis system for a unit oil station according to claim 1, characterized in that: The scraper strip (11) comprises a fixing rod (41) and an elastic strip (42) connected to the bottom of the fixing rod (41).

8. The lubricating oil online analysis system for a unit oil station according to claim 1, characterized in that: A stirring paddle (43) is provided at the bottom of the screw (17), and an electric heating tube (44) is provided on the stirring paddle (43).

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