Trixylene phosphate fire-resistant hydraulic oil and preparation method thereof

Abstract

The invention discloses trixylyl phosphate fire-resistant hydraulic oil and a preparation method thereof.The neutralization tank comprises a tank body, a detection box is installed on the outer side of the tank body, a sampling barrel is transversely arranged between the detection box and the side edge of the tank body in a penetrating mode, a screw is installed in the sampling barrel through a motor, and the screw is sleeved with a movable frame in a threaded mode; a CCD camera is mounted on the inner wall of the detection box, a mounting column is longitudinally connected to the interior of the detection box through a motor, a placement plate and a clamping plate are arranged on the two sides of the outer end of a mounting base respectively, a pushing assembly is arranged at the bottom of a sampling barrel, and the pushing assembly is used for adjusting the position of the end of the clamped PH test paper. According to the trixylyl phosphate fire-resistant hydraulic oil and the preparation method thereof, the acidity is detected in real time in the neutralization process, so that the neutralization efficiency is improved, the external interference is reduced, and the preparation efficiency of the trixylyl phosphate fire-resistant hydraulic oil is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic oil preparation, in particular to trixylene phosphate flame-resistant hydraulic oil and a preparation method thereof. Background Art

[0002] Hydraulic oil is a hydraulic medium used in hydraulic systems that utilize liquid pressure energy. It plays a role in energy transfer, anti-wear, system lubrication, anti-corrosion, anti-rust, cooling, etc. in hydraulic systems. For hydraulic oil, first of all, it should meet the requirements of the hydraulic device for liquid viscosity at working temperature and starting temperature. Since the viscosity change of lubricating oil is directly related to hydraulic action, transmission efficiency and transmission accuracy, it is also required that the viscosity-temperature performance and shear stability of the oil should meet the various requirements raised by different uses; trixylene phosphate products are insoluble in water, miscible with dichloromethane, benzene, toluene, alcohol and methyl ethyl ketone, and are basically non-toxic. When trixylene phosphate escapes due to fire in the environment in which it is located, the liquid can be diluted into a non-flammable mixture after being sprayed with water, thereby exerting flame retardant properties and can be used for fire-resistant hydraulic oil; In the preparation process of hydraulic oil, most of them need to carry out neutralization reaction. However, in the existing neutralization reaction process, it is not convenient to detect the acidity of the product in real time. Most of them need to stop the machine for sampling and then use instruments for detection. On the one hand, the accuracy of neutralization is reduced and the subsequent preparation of the product is affected. On the other hand, the whole process requires multiple detections. This sampling and detection method is relatively cumbersome. On this basis, multiple detections involve the purity of the sample. The existing equipment is not convenient for convenient interference-free detection, which is easy to cause cross-interference of samples in different time periods, further affecting the accuracy of the detection.

[0003] In view of the above problems, it is urgent to carry out innovative design based on the original one. Summary of the invention

[0004] The object of the present invention is to provide a trixylene phosphate flame-resistant hydraulic oil and a preparation method thereof, so as to solve the problem that in the existing neutralization reaction process proposed in the above background technology, it is inconvenient to detect the acidity of the product in real time and it is inconvenient to perform convenient interference-free detection. The technical solution of the present invention aims at the technical problem that the existing technical solution is too single, and provides a solution that is significantly different from the existing technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a trixylyl phosphate fire-resistant hydraulic oil and a preparation method thereof, wherein the mass fractions of each raw material in the trixylyl phosphate fire-resistant hydraulic oil are as follows: 1340-1550 parts of xylenol; 610-640 parts of phosphorus oxychloride; Antioxidant 0.03-0.12 parts; Antifoaming agent 0.02-0.04 parts; Rust inhibitor 0.030-0.035 parts.

[0006] Preferably, the method comprises the following steps: S1: Vacuum the esterification kettle. When the vacuum degree in the esterification kettle is greater than 300 mmHg, xylenol is pumped into the esterification kettle; then the prepared catalyst is added; when the temperature in the esterification kettle is lower than 60°C, phosphorus oxychloride is pumped into the esterification kettle, and then the vent on the esterification kettle is opened until there is no negative pressure in the esterification kettle; S2: Open the atmospheric pressure acid discharge system, and fill the condenser and the hydrochloric acid absorption tower with cooling water, open the atmospheric pressure acid discharge valve, start the agitator, and adjust the negative pressure pipeline valve on the acid circulation pump to maintain the pressure in the esterification kettle described in step S1 at 60 mmHg; then add steam into the esterification kettle for heating treatment, and after rapidly heating to 70°C within 1 hour, heat it at a rate of 3°C per hour. When the temperature rises to 95°C, heat it at a rate of 5 to 8°C per hour. In this process, the volatilized phosphorus oxychloride vapor is condensed by the condenser and then refluxed into the esterification kettle, and the generated hydrogen chloride gas enters the falling film absorber through the condenser, is absorbed by water, and then flows into the strong acid circulation tank by gravity; S3: When the reaction temperature rises to 135-140°C, the normal pressure acid discharge system is closed and the negative pressure acid discharge system is started. The small amount of hydrogen chloride gas remaining in the esterification kettle enters the jet pump through the vacuum pipe and the buffer tank, and enters the weak acid circulation tank after being absorbed by water; the unabsorbed hydrogen chloride gas is absorbed by the tertiary water and discharged from the high exhaust pipe. After the acid discharge is completed, the negative pressure valve is closed, the negative pressure pipeline is emptied, and the esterification kettle is emptied to normal pressure; S4: Detect the acid value in step S2, add it into a neutralization tank, add soda ash to neutralize it until its acid value is 2 mgKOH / g, and obtain a crude product of trixylene phosphate; S5: The crude trixylene phosphate obtained in step S4 is pumped into a distillation kettle, and the Roots vacuum unit and the far-infrared heating device are turned on. When the temperature reaches 280-310° C., the superior product is distilled out, and after being condensed in a condenser, it enters a superior product receiving tank, thereby obtaining the superior trixylene phosphate; S6: adding antioxidant, antifoaming agent and rust inhibitor to the trixylene phosphate product obtained in step S4 under stirring conditions, and stirring evenly to obtain the trixylene phosphate flame retardant hydraulic oil product.

[0007] Preferably, the neutralization tank includes a tank body, a detection box is installed on the outside of the tank body, and a sampling barrel is transversely arranged between the detection box and the side of the tank body, a screw is installed in the sampling barrel through a motor, and a movable frame is provided on the threaded sleeve of the screw, and a piston is fixed on the inner end of the movable frame, a CCD camera is installed on the inner wall of the detection box, the interior of the detection box is longitudinally connected with a mounting column through a motor, and a mounting seat is fixed on the outside of the mounting column, and the mounting column is located below the sampling barrel, a placing plate and a clamping plate are respectively arranged on both sides of the outer end of the mounting seat, and the clamping plate slides elastically in the cavity at the outer end of the mounting seat through a spring, a positioning and clamping assembly is arranged between the mounting seat and the inner wall of the detection box, and the positioning and clamping assembly is used to clamp the PH test paper, a pushing assembly is arranged at the bottom of the sampling barrel, and the pushing assembly is used to adjust the position of the clamped end of the PH test paper.

[0008] Preferably, the movable frame is limited and fit to slide in the sampling barrel by a screw, and an opening is provided at the bottom of the sampling barrel.

[0009] Preferably, the CCD camera is arranged to tilt upward in the detection box, and the orientation of the CCD camera corresponds to the opening position of the bottom of the sampling tube.

[0010] Preferably, the mounting seats are distributed at equal angles on the mounting column, and the placement plate and clamping plate on the mounting seats are used to place and clamp the pH test paper.

[0011] Preferably, the positioning and clamping assembly includes a top shaft, and the top shaft is set at the rear end of the mounting seat through an elastic telescopic rod, and the front end of the top shaft is located on the outside of the clamping plate, and a protrusion is set on the movable track of the top shaft, and the protrusion is fixed on the rear side wall of the detection box.

[0012] Preferably, the contact position between the clamping plate and the top shaft is set as an inclined structure, and the protrusion at the corresponding position of the top shaft is designed as a hemispherical structure, and the position of the protrusion corresponds to the opening position at the bottom of the sampling tube.

[0013] Preferably, the pushing assembly includes gear one, and gear one is embedded and rotatably installed at the bottom of the sampling barrel, the bottom of gear one is meshed with gear two, and gear two is embedded and rotatably installed at the bottom of the sampling barrel, a main push rod is fixed to the bottom of gear two, and a secondary push rod is embedded and slidably installed at the end of the main push rod through a spring, a push strip is arranged on the movable track of the secondary push rod, and the push strip is fixed to the bottom of the sampling barrel.

[0014] Preferably, the gear one is located below the movable frame, and the lower end surface of the movable frame is provided with a rack structure for driving the gear one to rotate, the auxiliary push rod is designed as an "L"-shaped structure, and the positions of the auxiliary push rod and the main push rod after rotation correspond to the opening position at the bottom of the sampling tube.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By adding a detection box on the side of the tank, the screw drives the movable frame and the piston to reciprocate, so that the material in the tank can be easily discharged and discharged through the bottom opening of the sampling tube. The reset of the movable frame and the piston can push the excess material into the tank for neutralization again, retaining the purity of the next sampling, which is convenient for more accurate acidity testing of the material; 2. A mounting seat is arranged on the outer circumference of the mounting column in the detection box. The placement plate and the clamping plate are used to facilitate the placement of the PH test paper. The positioning and clamping assembly can then be used to clamp the PH test paper at the corresponding position, so that the PH test paper at the corresponding position can be pushed from the inclined surface to the horizontal position through the pushing assembly. That is, the PH test paper of the placement plate and the protruding part of the end of the clamping plate at the upper right corner is pushed to the area below the bottom opening of the sampling tube, so that the material can drip on the end area of ​​the PH test paper. After the detection is completed, the clamping plate is sent away, and the PH test paper is dropped and collected. The whole process can be carried out regularly without stopping the machine. At the same time, the clamping, approaching and pushing of the end of the PH test paper can prevent the material from escaping to other areas, ensure the purity of the detection process, and improve the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the neutralization tank of the present invention; Figure 2 This is a schematic diagram of the internal structure of the detection box of the present invention; Figure 3 This is a schematic diagram of the distribution structure of the placement plate and the clamping plate of the present invention; Figure 4 For the present invention Figure 2 The enlarged structural diagram at A in the middle; Figure 5 This is a schematic diagram of the top view distribution structure of the splint of the present invention; Figure 6 This is a schematic diagram of the inclined surface structure of the splint of the present invention; Figure 7 For the present invention Figure 2 Enlarged structural diagram at B in the middle.

[0017] In the figure: 1, tank body; 2, detection box; 3, sampling tube; 4, screw; 5, movable frame; 6, piston; 7, CCD camera; 8, mounting column; 9, mounting seat; 10, placement plate; 11, clamping plate; 121, top shaft; 122, elastic telescopic rod; 123, bump; 131, gear 1; 132, gear 2; 133, main push rod; 134, auxiliary push rod; 135, push strip. 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 , the present invention provides a technical solution: a trixylyl phosphate fire-resistant hydraulic oil and a preparation method thereof; The mass fractions of each raw material in trixylyl phosphate fire-resistant hydraulic oil are as follows: 1340-1550 parts of xylenol; 610-640 parts of phosphorus oxychloride; Antioxidant 0.03-0.12 parts; Antifoaming agent 0.02-0.04 parts; Rust inhibitor 0.030-0.035 parts.

[0020] The method comprises the following steps: S1: Vacuum the esterification kettle. When the vacuum degree in the esterification kettle is greater than 300 mmHg, xylenol is pumped into the esterification kettle; then the prepared catalyst is added; when the temperature in the esterification kettle is lower than 60°C, phosphorus oxychloride is pumped into the esterification kettle, and then the vent on the esterification kettle is opened until there is no negative pressure in the esterification kettle; S2: Open the atmospheric pressure acid discharge system, and fill the condenser and the hydrochloric acid absorption tower with cooling water, open the atmospheric pressure acid discharge valve, start the agitator, and adjust the negative pressure pipeline valve on the acid circulation pump to maintain the pressure in the esterification kettle described in step S1 at 60 mmHg; then add steam into the esterification kettle for heating treatment, and after rapidly heating to 70°C within 1 hour, heat it at a rate of 3°C per hour. When the temperature rises to 95°C, heat it at a rate of 5 to 8°C per hour. In this process, the volatilized phosphorus oxychloride vapor is condensed by the condenser and then refluxed into the esterification kettle, and the generated hydrogen chloride gas enters the falling film absorber through the condenser, is absorbed by water, and then flows into the strong acid circulation tank by gravity; S3: When the reaction temperature rises to 135-140°C, the normal pressure acid discharge system is closed and the negative pressure acid discharge system is started. The small amount of hydrogen chloride gas remaining in the esterification kettle enters the jet pump through the vacuum pipe and the buffer tank, and enters the weak acid circulation tank after being absorbed by water; the unabsorbed hydrogen chloride gas is absorbed by the tertiary water and discharged from the high exhaust pipe. After the acid discharge is completed, the negative pressure valve is closed, the negative pressure pipeline is emptied, and the esterification kettle is emptied to normal pressure; S4: Detect the acid value in step S2, add it into a neutralization tank, add soda ash to neutralize it until its acid value is 2 mgKOH / g, and obtain a crude product of trixylene phosphate; S5: The crude trixylene phosphate obtained in step S4 is pumped into a distillation kettle, and the Roots vacuum unit and the far-infrared heating device are turned on. When the temperature reaches 280-310° C., the superior product is distilled out, and after being condensed in a condenser, it enters a superior product receiving tank, thereby obtaining the superior trixylene phosphate; S6: adding antioxidant, antifoaming agent and rust inhibitor to the trixylene phosphate product obtained in step S4 under stirring conditions, and stirring evenly to obtain the trixylene phosphate flame retardant hydraulic oil product.

[0021] The neutralization tank includes a tank body 1, a detection box 2 is installed on the outside of the tank body 1, and a sampling tube 3 is transversely arranged between the detection box 2 and the side of the tank body 1, a screw 4 is installed in the sampling tube 3 through a motor, and a movable frame 5 is threadedly sleeved on the screw 4, and a piston 6 is fixed to the inner end of the movable frame 5, a CCD camera 7 is installed on the inner wall of the detection box 2, the inside of the detection box 2 is longitudinally connected with a mounting column 8 through a motor, and a mounting seat 9 is fixed on the outside of the mounting column 8, and the mounting column 8 is located below the sampling tube 3, a placement plate 10 and a clamping plate 11 are respectively arranged on both sides of the outer end of the mounting seat 9, and the clamping plate 11 slides elastically in the cavity at the outer end of the mounting seat 9 through a spring, a positioning clamping assembly is arranged between the mounting seat 9 and the inner wall of the detection box 2, and the positioning clamping assembly is used to clamp the pH test paper; The movable frame 5 is limited and fit to slide in the sampling tube 3 by the screw 4, and the bottom of the sampling tube 3 is provided with an opening; the CCD camera 7 is arranged to tilt upward in the detection box 2, and the direction of the CCD camera 7 corresponds to the opening position at the bottom of the sampling tube 3; the mounting seat 9 is distributed at equal angles on the mounting column 8, and the placement plate 10 and the clamping plate 11 on the mounting seat 9 are used to place and clamp the PH test paper; the positioning and clamping assembly includes a top shaft 121, and the top shaft 121 is arranged at the rear end of the mounting seat 9 through an elastic telescopic rod 122, and the front end of the top shaft 121 is located on the outside of the clamping plate 11, and a protrusion 123 is arranged on the movable track of the top shaft 121, and the protrusion 123 is fixed on the rear side wall of the detection box 2; the contact position between the clamping plate 11 and the top shaft 121 is set as an inclined structure, and the protrusion 123 at the corresponding position of the top shaft 121 is designed as a hemispherical structure, and the position of the protrusion 123 corresponds to the opening position at the bottom of the sampling tube 3; Through the circumferential rotation of multiple mounting seats 9, clean PH test paper can be moved to the bottom opening area of ​​the sampling tube 3 in turn, and the PH test paper can be clamped to ensure stable detection and avoid material escape. Then, the color of the PH test paper is photographed by the CCD camera 7 and recognized by the background, realizing non-stop automatic acidity detection; A pushing assembly is provided at the bottom of the sampling tube 3, and the pushing assembly is used to adjust the position of the clamped PH test paper end; the pushing assembly includes a gear 131, and the gear 131 is embedded and rotatably installed at the bottom of the sampling tube 3, the bottom of the gear 131 is meshed with a gear 2 132, and the gear 2 132 is embedded and rotatably installed at the bottom of the sampling tube 3, a main push rod 133 is fixed to the bottom of the gear 2 132, and a sub-pull rod 134 is slidably installed at the end of the main push rod 133 through a spring embedded, a push bar 135 is provided on the movable track of the sub-pull rod 134, and the push bar 135 is fixed to the bottom of the sampling tube 3; the gear 131 is located below the movable frame 5, and the lower end surface of the movable frame 5 is provided with a rack structure for driving the gear 131 to rotate, the sub-pull rod 134 is designed as an "L"-shaped structure, and the positions of the sub-pull rod 134 and the main push rod 133 after rotation correspond to the opening position at the bottom of the sampling tube 3; During testing, the movement of the movable frame 5, in addition to realizing the suction of the material, can also drive the main push rod 133 to rotate through gear 131 and gear 131, flatten the extended PH test paper, and increase the flattening stroke through the auxiliary push rod 134 to avoid obstruction to the rotation trajectory of the mounting seat 9, thereby ensuring stable dripping and testing of the material.

[0022] Working principle: first, pour the material into the tank body 1, and add the acid-base neutralizing liquid, and stir the material through the neutralization stirring mechanism built into the tank body 1. During this process, the motor drives the screw 4 to rotate, and the movable frame 5 drives the piston 6 to move, so that the material in the tank body 1 is drawn into the sampling tube 3. At the same time, the PH test paper is manually placed between the corresponding placement plate 10 and the clamping plate 11 from the outside, and the motor drives the mounting column 8 to rotate, and the placement plate 10 and the clamping plate 11 with the PH test paper are rotated to the bottom opening area of ​​the sampling tube 3. The top shaft 121 moves to the position of the protrusion 123, so that the top shaft 121 moves and contacts the inclined surface of the clamping plate 11, drives the clamping plate 11 to move toward the placement plate 10, and clamps the PH test paper. At the same time, the movable frame 5 The movement can drive the gear 1 131 to rotate, drive the main push rod 133 to rotate through the gear 2 132, and push the auxiliary push rod 134 out through the push bar 135, so that the auxiliary push rod 134 bypasses the clamping plate 11 to press the extended PH test paper, so that the extended area of ​​the PH test paper is flattened, corresponding to the bottom opening of the sampling tube 3, and the logistics in the sampling tube 3 drips onto the PH test paper to test the pH value, and the color of the PH test paper is photographed by the CCD camera 7, and the background determines whether it meets the standard, and continues to add acid-base neutralizing solution; Repeat the above steps to carry out subsequent tests. The resetting of the movable frame 5 causes the main push rod 133 and the auxiliary push rod 134 to be in position. When the used PH test paper follows the rotation, the push shaft 121 at this position is separated from the protrusion 123. Under the action of the elastic telescopic rod 122, the push shaft 121 is reset, so that the clamping plate 11 is reset under the action of the spring, and the clamping force on the PH test paper is lost. The PH test paper falls from the bottom opening of the detection box 2 under the action of gravity.

[0023] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field. In the description of the present invention, unless otherwise specified, "multiple" means two or more; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A trixylyl phosphate fire-resistant hydraulic oil, characterized in that: The mass fractions of each raw material in the trixylyl phosphate fire-resistant hydraulic oil are as follows: 1340-1550 parts of xylenol; 610-640 parts of phosphorus oxychloride; Antioxidant 0.03-0.12 parts; Antifoaming agent 0.02-0.04 parts; Rust inhibitor 0.030-0.035 parts.

2. A method for preparing trixylyl phosphate fire-resistant hydraulic oil, applied to the trixylyl phosphate fire-resistant hydraulic oil according to claim 1, characterized in that: The method comprises the following steps: S1: Vacuum the esterification kettle. When the vacuum degree in the esterification kettle is greater than 300 mmHg, xylenol is pumped into the esterification kettle; then the prepared catalyst is added; when the temperature in the esterification kettle is lower than 60°C, phosphorus oxychloride is pumped into the esterification kettle, and then the vent on the esterification kettle is opened until there is no negative pressure in the esterification kettle; S2: Open the atmospheric pressure acid discharge system, and fill the condenser and the hydrochloric acid absorption tower with cooling water, open the atmospheric pressure acid discharge valve, start the agitator, and adjust the negative pressure pipeline valve on the acid circulation pump to maintain the pressure in the esterification kettle described in step S1 at 60 mmHg; then add steam into the esterification kettle for heating treatment, and after rapidly heating to 70°C within 1 hour, heat it at a rate of 3°C per hour. When the temperature rises to 95°C, heat it at a rate of 5 to 8°C per hour. In this process, the volatilized phosphorus oxychloride vapor is condensed by the condenser and then refluxed into the esterification kettle, and the generated hydrogen chloride gas enters the falling film absorber through the condenser, is absorbed by water, and then flows into the strong acid circulation tank by gravity; S3: When the reaction temperature rises to 135-140°C, the normal pressure acid discharge system is closed and the negative pressure acid discharge system is started. The small amount of hydrogen chloride gas remaining in the esterification kettle enters the jet pump through the vacuum pipe and the buffer tank, and enters the weak acid circulation tank after being absorbed by water; the unabsorbed hydrogen chloride gas is absorbed by the tertiary water and discharged from the high exhaust pipe. After the acid discharge is completed, the negative pressure valve is closed, the negative pressure pipeline is emptied, and the esterification kettle is emptied to normal pressure; S4: Detect the acid value in step S2, add it into a neutralization tank, add soda ash to neutralize it until its acid value is 2 mgKOH / g, and obtain a crude product of trixylene phosphate; S5: The crude trixylene phosphate obtained in step S4 is pumped into a distillation kettle, and the Roots vacuum unit and the far-infrared heating device are turned on. When the temperature reaches 280-310° C., the superior product is distilled out, and after being condensed in a condenser, it enters a superior product receiving tank, thereby obtaining the superior trixylene phosphate; S6: adding antioxidant, antifoaming agent and rust inhibitor to the trixylene phosphate product obtained in step S4 under stirring conditions, and stirring evenly to obtain the trixylene phosphate flame retardant hydraulic oil product.

3. The method for preparing a trixylyl phosphate fire-resistant hydraulic oil according to claim 2, characterized in that: The neutralization tank in step S4 comprises a tank body (1), a detection box (2) is installed on the outer side of the tank body (1), and a sampling tube (3) is arranged transversely between the detection box (2) and the side of the tank body (1), a screw (4) is installed in the sampling tube (3) through a motor, and a movable frame (5) is threadedly sleeved on the screw (4), and a piston (6) is fixed to the inner end of the movable frame (5), a CCD camera (7) is installed on the inner wall of the detection box (2), and a mounting column (8) is longitudinally connected to the inside of the detection box (2) through a motor, and the mounting column (8) ) is fixed to the outside of the sample tube (3), and the mounting column (8) is located below the sampling tube (3). A placement plate (10) and a clamping plate (11) are respectively provided on both sides of the outer end of the mounting seat (9), and the clamping plate (11) elastically slides in the cavity at the outer end of the mounting seat (9) through a spring. A positioning clamping assembly is provided between the mounting seat (9) and the inner wall of the detection box (2), and the positioning clamping assembly is used to clamp the pH test paper. A pushing assembly is provided at the bottom of the sampling tube (3), and the pushing assembly is used to adjust the position of the clamped end of the pH test paper.

4. The method for preparing a trixylyl phosphate fire-resistant hydraulic oil according to claim 3, characterized in that: The movable frame (5) is limitedly fitted and slidable in the sampling barrel (3) via the screw rod (4), and an opening is provided at the bottom of the sampling barrel (3).

5. The method for preparing a trixylyl phosphate fire-resistant hydraulic oil according to claim 4, characterized in that: The CCD camera (7) is arranged in an upward tilted manner in the detection box (2), and the orientation of the CCD camera (7) corresponds to the bottom opening position of the sampling tube (3).

6. The method for preparing a trixylyl phosphate fire-resistant hydraulic oil according to claim 5, characterized in that: The mounting seats (9) are distributed at equal angles on the mounting column (8), and the placement plate (10) and the clamping plate (11) on the mounting seat (9) are used to place and clamp the pH test paper.

7. The method for preparing a trixylyl phosphate fire-resistant hydraulic oil according to claim 6, characterized in that: The positioning clamping assembly comprises a top shaft (121), and the top shaft (121) is arranged at the rear end of the mounting seat (9) through an elastic telescopic rod (122), and the front end of the top shaft (121) is located outside the clamping plate (11), and a protrusion (123) is arranged on the movable track of the top shaft (121), and the protrusion (123) is fixed on the rear side wall of the detection box (2).

8. The method for preparing a trixylyl phosphate fire-resistant hydraulic oil according to claim 7, characterized in that: The contact position between the clamping plate (11) and the top shaft (121) is set as an inclined surface structure, and the protrusion (123) at the corresponding position of the top shaft (121) is designed as a hemispherical structure, and the position of the protrusion (123) corresponds to the bottom opening position of the sampling tube (3).

9. The method for preparing a trixylyl phosphate fire-resistant hydraulic oil according to claim 8, characterized in that: The pushing assembly comprises a gear 1 (131), and the gear 1 (131) is embedded and rotatably mounted on the bottom of the sampling barrel (3); the bottom of the gear 1 (131) is meshed with a gear 2 (132), and the gear 2 (132) is embedded and rotatably mounted on the bottom of the sampling barrel (3); a main push rod (133) is fixed to the bottom of the gear 2 (132), and a secondary push rod (134) is embedded and slidably mounted on the end of the main push rod (133) through a spring; a push bar (135) is provided on the movable track of the secondary push rod (134), and the push bar (135) is fixed to the bottom of the sampling barrel (3).

10. The method for preparing a trixylyl phosphate fire-resistant hydraulic oil according to claim 9, characterized in that: The gear one (131) is located below the movable frame (5), and a rack structure for driving the gear one (131) to rotate is provided on the lower end surface of the movable frame (5). The auxiliary push rod (134) is designed as an "L"-shaped structure, and the positions of the auxiliary push rod (134) and the main push rod (133) after rotation correspond to the bottom opening position of the sampling tube (3).

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