Additive adding equipment and method for preparing flame-retardant hydraulic fluid

Abstract

The invention discloses additive adding equipment and method for preparing flame-retardant hydraulic fluid, and belongs to the technical field of hydraulic oil production and processing. The additive adding equipment for preparing the flame-retardant hydraulic fluid comprises a tank body and further comprises an inner pipe, an outer pipe, an outer pipe, an outer pipe, an outer pipe, an inner pipe and a liquid inlet pipe, and the inner pipe is arranged in an inner cavity of the tank body and communicated with the inner cavity of the tank body; the shearing mechanism comprises a transmission shaft, a plurality of shearing rods and a plurality of groups of fan blades, the transmission shaft and the inner pipe are coaxially arranged and rotationally connected, and the multiple fan blades in each group are arranged in the circumferential direction of the transmission shaft and connected with the transmission shaft; when the power device drives the multiple fan blades to rotate through the transmission shaft, the fan blades apply thrust towards the bottom of the tank body to hydraulic oil in the inner pipe, and the distance between the side edge of each fan blade and the side edge of the shearing rod is 0.2-0.5 mm; and the cooler is used for cooling the tank body. According to the additive adding equipment for preparing the flame-retardant hydraulic fluid, heat conduction is accelerated through circular flow, and the decomposition probability of an additive can be reduced.

Description

Technical Field

[0001] This invention relates to the field of hydraulic oil production and processing technology, specifically to an additive addition device and method for preparing flame-retardant hydraulic fluid. Background Technology

[0002] With the rapid development of high-risk industrial sectors such as metallurgy, mining, and aerospace, the requirements for the operational safety of hydraulic systems are continuously increasing. Flame-retardant hydraulic fluids, with their excellent flame-retardant, anti-explosion, anti-wear, and anti-oxidation properties, have become a core oil product to replace ordinary mineral hydraulic oils and avoid fire hazards under high-temperature open flame conditions. They are widely used in hydraulic equipment operating at high temperatures, high pressures, and near heat sources. The performance of high-quality flame-retardant hydraulic fluids relies on the precise addition and efficient homogeneous mixing of various specialized additives. The dispersion uniformity and component stability of these additives directly determine the flame retardancy, service life, and operational reliability of the oil, meeting the core preparation requirements of high-end industrial hydraulic systems for high performance, high stability, and long service life.

[0003] Existing flame-retardant hydraulic fluid additive addition equipment typically consists of a mixing tank, a high-shear stirring mechanism, a metering dispensing component, and a simple temperature control component. During preparation, various additives are fed into the tank according to the proportion through the metering dispensing component. Then, relying on the high-speed operation of the high-shear stirring mechanism, the additives and base hydraulic oil are sheared and dispersed to achieve the dispersion and fusion of the additives. Finally, the additive addition and mixing process is completed to obtain a homogeneous flame-retardant hydraulic fluid mixture.

[0004] However, the high-shear mixing mechanism of existing equipment generates a high-shear field during high-speed operation. When the additive and hydraulic oil are mixed under high shear in the high-shear field, a large amount of instantaneous heat is generated, which causes the temperature of the material around the high-shear field to rise rapidly. Since most of the additives for flame-retardant hydraulic fluids are heat-sensitive components, the additives may suffer from molecular structure damage and decomposition failure when the temperature is too high. This will not only reduce the functionality of the additives, but may also lead to uneven oil performance, reduced flame retardancy and anti-wear properties, and affect the product quality of flame-retardant hydraulic fluids. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems in the prior art and provide an additive addition device for the preparation of flame-retardant hydraulic fluid, which can prevent the additive from decomposing due to excessive temperature during high-shear mixing.

[0006] This invention provides an additive addition device for preparing flame-retardant hydraulic fluid, comprising a tank, the tank being vertically arranged and having a feed inlet, and further comprising: The inner tube is located inside the inner cavity of the tank and communicates with the inner cavity of the tank. There is a gap between the outer wall of the inner tube and the inner wall of the tank. The top of the inner tube is lower than the top of the tank, and the axis of the inner tube is parallel to the axis of the tank. The shearing mechanism includes a drive shaft, multiple shearing rods, and multiple sets of fan blades. The drive shaft is coaxially arranged with the inner tube and rotatably connected to the inner tube. The multiple shearing rods are arranged along the axial direction of the inner tube, and each shearing rod is connected to the inner wall of the inner tube. The multiple sets of fan blades are arranged along the axial direction of the drive shaft, and the multiple sets of fan blades are spaced apart from the multiple shearing rods. The multiple fan blades in each set are arranged circumferentially along the drive shaft and connected to the drive shaft. The power unit is connected to the drive shaft. When the power unit drives multiple fan blades to rotate through the drive shaft, the fan blades apply a thrust toward the bottom of the tank to the hydraulic oil in the inner tube. Each fan blade can intersect with the adjacent shear bar. When the fan blade intersects with the adjacent shear bar, the distance between the side edge of the fan blade and the side edge of the shear bar is 0.2 mm to 0.5 mm. A cooler is installed on the outer wall of the tank body to cool the tank body.

[0007] Preferably, a base is fixedly connected to the drive shaft, and the base is provided with a through hole along the radial direction of the drive shaft. The fan blade is connected to a rotating shaft, which is rotatably connected to the through hole. The fan blade is connected to a drive unit, which is used to drive each fan blade to rotate radially around the drive shaft to adjust the angle between each fan blade and the cross section of the drive shaft. When the fan blade rotates with the drive shaft to intersect with the adjacent shear bar, the cross section of the fan blade is perpendicular to the cross section of the drive shaft. When the fan blade rotates with the drive shaft to the side away from the shear bar, the angle between the cross section of the fan blade and the drive shaft is an acute angle.

[0008] Preferably, the drive unit includes a cam groove and a drive slider. The cam groove is disposed on the inner wall of the inner tube, and the drive slider is slidably connected in the cam groove. The drive slider is fixedly connected to the fan blade. When the fan blade rotates with the drive shaft to intersect with the adjacent shear bar, under the action of the drive slider and the cam groove, the fan blade is perpendicular to the cross section of the drive shaft.

[0009] Preferably, the shear bar is provided with a sliding hole, and the shear bar is slidably connected to the drive shaft along the axial direction of the drive shaft through the sliding hole. The drive shaft is provided with an elastic structure, which is used to apply an elastic force along the axial direction of the drive shaft to the shear bar so that the distance between the side edge of the fan blade and the side edge of the adjacent shear bar can be adjusted between 0.2 mm and 0.5 mm.

[0010] Preferably, the elastic structure includes two springs, which are respectively disposed on the drive shafts on both sides of the shear bar. The two springs abut against the two ends of the shear bar, and apply elastic forces to the shear bar along the axial direction of the drive shaft and in opposite directions. The base is provided with a limiting ring, which is used to limit the stroke of the shear bar so that the distance between the side edge of the fan blade and the side edge of the adjacent shear bar is between 0.2 mm and 0.5 mm.

[0011] Preferably, the inner wall of the inner tube is provided with a limiting groove along the axial direction of the drive shaft, and the end of the shearing rod is slidably connected in the limiting groove. The limiting groove is used to prevent the shearing rod from rotating around the axial direction of the drive shaft.

[0012] Preferably, the cooler is a spiral heat exchange tube, and the spiral heat exchange tube is connected to a speed regulating valve, which is used to regulate the flow rate of the coolant in the spiral heat exchange tube.

[0013] Preferably, a temperature sensor is provided at the bottom of the drive shaft. The temperature sensor is used to detect the real-time temperature value of the hydraulic oil in the inner cavity of the tank. The temperature sensor is electrically connected to a controller, which is electrically connected to the speed control valve. A preset temperature value is stored in the controller. When the real-time temperature value is higher than the preset temperature value, the controller controls the opening of the speed control valve to increase.

[0014] Preferably, a thermally conductive silicone layer is provided between the spiral heat exchange tube and the outer wall of the tank.

[0015] This invention also provides a method for using an additive addition device for preparing flame-retardant hydraulic fluid, characterized by comprising the following steps: Inject a fixed amount of basic hydraulic oil into the tank to ensure that the hydraulic oil level is higher than the top of the inner pipe; Add the additive slowly through the feed inlet according to the formula to avoid additive agglomeration and accumulation. Control the distance between the side edge of the fan blade and the side edge of the shear bar to 0.2mm to 0.5mm. Set the cooler to a target temperature of 30℃ to 50℃ and test the linkage stability of the power unit and the drive shaft. When the power unit and cooler are started, the drive shaft drives the fan blades to rotate coaxially with the inner tube. The fan blades generate axial thrust to drive the hydraulic oil to flow downward along the inner tube. After turning at the bottom of the tank, the oil flows upward from the gap between the inner tube and the inner wall of the tank, and flows into the top of the inner tube to form a closed loop circulation, so that the additives can flow without dead corners. During the cycle, a continuous high shear field is formed between the staggered fan blades and the shear bars. The continuous high shear field is used to shear and impact the mixed liquid flow, so that the agglomerates are broken up and the mixed liquid is repeatedly sheared. The cooler fits against the outer wall of the tank and continuously absorbs shear heat, keeping the temperature within a preset range with fluctuations not exceeding ±2℃, thus preventing the additives from decomposing at high temperatures.

[0016] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention provides an additive addition device for preparing flame-retardant hydraulic fluid. According to the formula requirements, additives such as anti-wear agents are slowly added to avoid the risk of agglomeration. A power unit drives the fan blades to rotate, applying a thrust towards the bottom of the tank to the hydraulic oil inside the inner tube, forming directional fluid dynamics. With the cooperation of the inner tube and the gap, the hydraulic oil forms a closed-loop circulation. This dynamic circulation mode breaks the unidirectional flow limitation of traditional stirring, eliminating the problem of local accumulation. More importantly, the circulating flow can accelerate the conduction of heat generated by shearing to the outer wall of the tank, avoiding heat accumulation in the middle of the tank and creating conditions for efficient heat dissipation by the cooler. During fluid circulation, the staggered fan blades and shear bars construct a continuous high-shear field. When the mixed liquid flows in a high-shear field, it is subjected to strong shear force, impact force, and turbulent disturbance, causing the additive agglomerates to be rapidly broken down to the micron level, achieving uniform dispersion. The cooler continuously absorbs heat through the outer wall of the tank, controlling the tank temperature within a safe range, effectively preventing the additive from decomposing due to high temperatures and ensuring stable performance of the additive. The synergistic effect of circulation and high shear significantly improves mixing uniformity, ensuring stable hydraulic fluid performance. Furthermore, the circulation accelerates heat conduction, and the cooler efficiently dissipates heat, further reducing the probability of additive decomposition and ensuring additive performance. It also avoids the damage of decomposition products to the overall performance of the hydraulic fluid, thus guaranteeing product quality from the source. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the first embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the second embodiment of the present invention; Figure 4 This is a schematic diagram of the AA surface of the present invention; Figure 5 This is a schematic diagram of the structure at the base of the present invention; Figure 6 This is a schematic diagram of the structure of the drive slider in this invention.

[0018] Explanation of reference numerals in the attached figures: 101. Tank body; 102. Shut-off valve; 103. Inner pipe; 104. Drive shaft; 105. Shear bar; 106. Fan blade; 107. Power unit; 108. Cooler; 201. Base; 202. Rotating shaft; 301. Cam groove; 302. Drive slider; 4. Elastic structure; 501. Spring; 502. Limiting ring; 6. Limiting groove; 7. Speed ​​control valve; 8. Temperature sensor; 9. Thermally conductive silicone layer. Detailed Implementation

[0019] The following is in conjunction with the appendix Figures 1-6The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] like Figures 1-6 As shown, the present invention provides an additive addition device for preparing flame-retardant hydraulic fluid, including a tank 101, which is vertically arranged and has an inlet connected to a shut-off valve 102. It also includes an inner tube 103, a shearing mechanism, a power unit 107, and a cooler 108. The inner tube 103 is located within and communicates with the inner cavity of the tank 101. A gap exists between the outer wall of the inner tube 103 and the inner wall of the tank 101. The top of the inner tube 103 is lower than the top of the tank 101, and the axial direction of the inner tube 103 is parallel to the axial direction of the tank 101. The shearing mechanism includes a drive shaft 104, multiple shearing rods 105, and multiple sets of fan blades 106. The drive shaft 104 is coaxially arranged with and rotatably connected to the inner tube 103. The multiple shearing rods 105 are arranged along the axial direction of the inner tube 103. Each shearing rod... All rods 105 are connected to the inner wall of the inner tube 103. The multiple sets of fan blades 106 are arranged axially along the drive shaft 104. The multiple sets of fan blades 106 are spaced apart from the multiple shearing rods 105. The multiple fan blades 106 in each set are arranged circumferentially along the drive shaft 104 and connected to the drive shaft 104. The power device 107 is connected to the drive shaft 104. When the power device 107 drives the multiple fan blades 106 to rotate through the drive shaft 104, the fan blades 106 apply a thrust toward the bottom of the tank 101 to the hydraulic oil in the inner tube 103. Each fan blade 106 can intersect with the adjacent shearing rod 105. When the fan blade 106 intersects with the adjacent shearing rod 105, the distance between the side edge of the fan blade 106 and the side edge of the shearing rod 105 is 0.2 mm to 0.5 mm. The cooler 108 is provided on the outer wall of the tank 101 for cooling the tank 101.

[0021] The working principle of the above embodiments is briefly described below: The tank 101 provides a sealed environment for preparation. The inlet and shut-off valve 102 work together to accurately add anti-wear agents and other additives as needed, avoiding the accumulation of additives. The gap between the inner tube 103 and the inner wall of the tank 101 forms a bidirectional circulation channel with the inner tube 103, and the top of the inner tube 103 is lower than the hydraulic oil level, providing the basic conditions for closed-loop fluid flow. The drive shaft 104 of the shearing mechanism rotates coaxially with the inner tube 103. Multiple sets of fan blades 106 and shearing rods 105 are arranged alternately along the axial direction. The axial thrust generated by the rotation of the fan blades 106 drives the fluid circulation. At the same time, when they intersect with the shearing rods 105 and fan blades 106, a high-intensity shearing field is formed. The cooler 108 is attached to the outer wall of the tank 101 and absorbs the heat generated during the cyclic shearing process, constructing a linkage system of "mixing-heat conduction-cooling".

[0022] Before preparation, precise debugging and parameter calibration must be completed: a fixed amount of basic hydraulic oil is injected into the tank 101 to ensure that the liquid level is higher than the top of the inner tube 103 to ensure smooth circulation; according to the formula requirements, the injection speed of the additive from the feed port can be adjusted through the shut-off valve 102, and the additive is injected slowly to avoid the risk of agglomeration. The assembly accuracy of the shearing mechanism is calibrated, and the distance between the side edge of the fan blade 106 and the side edge of the shear bar 105 is controlled within the range of 0.2mm to 0.5mm. This can generate a high-intensity shearing force to break up the additive agglomerates in the mixture, and will not cause excessive friction between the fan blade 106 and the mixture due to the small distance, thereby preventing the fan blade 106 from generating too much heat when shearing the mixture and causing the additive to decompose.

[0023] Start the cooler 108 and set the target temperature range of 30°C to 50°C. This range can meet the stable presence requirements of most anti-wear agents and other additives. At the same time, test the linkage stability between the power unit 107 and the drive shaft 104 to ensure smooth subsequent operations.

[0024] During operation, the power unit 107 drives the transmission shaft 104 to rotate the fan blades 106. The fan blades 106 apply a thrust towards the bottom of the tank to the hydraulic oil in the inner tube 103, forming directional fluid dynamics. With the cooperation of the inner tube 103 and the gap, the hydraulic oil forms a closed-loop circulation along the trajectory of "downward flow in the inner tube 103 - turning at the bottom of the tank - upward backflow in the gap - merging into the top of the inner tube 103". This dynamic circulation mode breaks the unidirectional flow limitation of traditional stirring, allowing the additive to flow without dead corners in the entire tank 101 with the hydraulic oil, avoiding local accumulation problems and providing a prerequisite for uniform mixing. More importantly, the circulating flow can accelerate the conduction of heat generated by shearing to the outer wall of the tank 101, avoiding heat accumulation in the middle of the tank 101, and creating conditions for efficient heat dissipation by the cooler 108.

[0025] During fluid circulation, the staggered fan blades 106 and shear bars 105 create a continuous high-shear field. When the mixture flows through the gap between the fan blades 106 and shear bars 105, it is subjected to strong shearing force, impact force, and turbulent disturbance, causing the additive agglomerates to be rapidly sheared and broken up, achieving uniform dispersion. At the same time, the circulating mixture repeatedly shuttles through the shear zone, undergoing high-intensity shearing action multiple times, further improving the dispersion uniformity and avoiding the problem of "sufficient local mixing but uneven overall dispersion". During this period, the cooler 108 continuously absorbs heat through the outer wall of the tank 101 to cool the mixture in the gap. The cooled mixture in the gap re-enters the inner tube 103 from the top, thereby controlling the temperature of the tank 101 within a safe range, effectively preventing the additive from decomposing due to high temperature and ensuring the stable performance of the additive. After mixing is completed, the power unit 107 and the cooler 108 are turned off, and after a short period of settling, a qualified flame-retardant hydraulic fluid is obtained.

[0026] The additive addition device for preparing flame-retardant hydraulic fluid of the present invention utilizes a combination of circulation and high shear to significantly improve mixing uniformity, ensuring stable hydraulic fluid performance. Furthermore, the circulation accelerates heat conduction, and the cooler 108 efficiently dissipates heat, greatly reducing the probability of additive decomposition and preventing the decomposition products from damaging the overall performance of the hydraulic fluid, thus ensuring product quality.

[0027] Based on the above embodiments, in order to improve the shearing and dispersion efficiency, ensure smooth circulation, and further avoid local heat accumulation.

[0028] like Figures 3-5 As shown, a base 201 is fixedly connected to the drive shaft 104. The base 201 has a through hole along the radial direction of the drive shaft 104. A fan blade 106 is connected to a rotating shaft 202, which is rotatably connected to the through hole. A drive unit is connected to the fan blade 106, which drives each fan blade 106 to rotate radially around the drive shaft 104 to adjust the angle between each fan blade 106 and the cross-section of the drive shaft 104. When the fan blade 106 rotates with the drive shaft 104 to intersect with an adjacent shear bar 105, the cross-section of the fan blade 106 is perpendicular to the cross-section of the drive shaft 104. When the fan blade 106 rotates with the drive shaft 104 to a side away from the shear bar 105, the angle between the fan blade 106 and the cross-section of the drive shaft 104 is an acute angle. This process transforms extrusion into shearing.

[0029] When the fan blade 106 rotates with the drive shaft 104 to a shearing position intersecting with the adjacent shear bar 105, the drive unit drives the fan blade 106 to rotate to a state perpendicular to the cross-section of the drive shaft 104. At this time, the fan blade 106 has a higher degree of contact with the shear bar 105 and the shearing gap is more regular, transforming the traditional extrusion force into precise shearing force, reducing ineffective friction and violent collisions. This not only prevents the mixture from being squeezed back, but also increases the concentration of shearing force, allowing the additive agglomerates to be broken up more thoroughly. When the fan blade 106 rotates to a circulation pushing position away from the shear bar 105, the drive unit drives the fan blade 106 to rotate to a state forming an acute angle with the cross-section of the drive shaft 104. This reduces the rotational resistance of the fan blade 106, reduces the heat generated by rotational friction, and at the same time enhances the axial pushing force, accelerating the circulation speed of the mixture in the inner tube 103, allowing the mixture to complete the closed-loop circulation more quickly, accelerating heat diffusion, thereby improving the shearing and dispersion efficiency, ensuring smooth circulation, and further avoiding local heat accumulation.

[0030] As a preferred option, such as Figure 3 , Figure 4 and Figure 6 As shown, the driving part includes a cam groove 301 and a driving slider 302. The cam groove 301 is provided on the inner wall of the inner tube 103. The driving slider 302 is slidably connected in the cam groove 301. The driving slider 302 is fixedly connected to the fan blade 106. When the fan blade 106 rotates with the transmission shaft 104 to intersect with the adjacent shear bar 105, under the action of the driving slider 302 and the cam groove 301, the fan blade 106 is perpendicular to the cross section of the transmission shaft 104. The drive shaft 104 drives the fan blade 106 to revolve synchronously with the drive slider 302. The drive slider 302 slides along the trajectory of the cam groove 301. When the fan blade 106 rotates to the position where the shear bar 105 intersects, the curved surface of the cam groove 301 pushes the drive slider 302 to move, thereby driving the fan blade 106 to rotate around the shaft 202 until it is perpendicular to the cross-section of the drive shaft 104, precisely entering the shearing state. This ensures that the intersecting gap between the fan blade 106 and the shear bar 105 remains stable, and the shearing force is uniform and without deviation, avoiding sudden changes in the gap that could cause severe friction and heat generation. When the fan blade 106 leaves the shearing position, the trajectory of the cam groove 301 resets, and the drive slider 302 drives the fan blade 106 to automatically rotate back to the acute angle state, restoring the efficient pushing function and accelerating fluid circulation and heat dissipation. The entire process requires no manual intervention, and the angle switching is precise and synchronized, avoiding shearing failure, circulation obstruction, or localized heat accumulation caused by misalignment of the fan blade 106. This further ensures the stability of shearing dispersion, improves the uniformity of additive mixing, and strictly controls temperature fluctuations to guarantee additive performance.

[0031] As a preferred option, such as Figure 3 and Figure 4As shown, the shearing rod 105 is provided with a sliding hole, and the shearing rod 105 is slidably connected to the transmission shaft 104 along the axial direction of the transmission shaft 104 through the sliding hole. The transmission shaft 104 is provided with an elastic structure 4, which is used to apply an elastic force along the axial direction of the transmission shaft 104 to the shearing rod 105 so that the distance between the side edge of the fan blade 106 and the side edge of the adjacent shearing rod 105 can be adjusted between 0.2 mm and 0.5 mm. If hard impurities are mixed into the mixture, or if the turbulence of the mixture causes a sudden increase in the extrusion pressure between the fan blade 106 and the shear bar 105, the shear bar 105 can slide slightly along the drive shaft 104 axially. The elastic structure 4 simultaneously generates elastic deformation to buffer the instantaneous impact force, preventing the fan blade 106 or the shear bar 105 from experiencing severe friction and localized high temperatures due to hard contact, reducing frictional heat generation, and extending the service life of the core components. When the impurities pass through or the extrusion pressure returns to normal, the elastic structure 4 releases its elastic force, pushing the shear bar 105 to quickly reset, so that the shear gap is always maintained within a reasonable range. This ensures a high-efficiency shear gap of 0.2mm to 0.5mm, while avoiding severe frictional heat accumulation caused by an excessively small gap. This addresses sudden working conditions during the mixing process, adapts to the mixing requirements of additives with different particle sizes and hardness, prevents gap jamming that could lead to equipment failure and a sudden temperature rise, ensures continuous and stable operation of the equipment, and avoids thermal failure of additives.

[0032] As a preferred option, such as Figure 5 As shown, the elastic structure 4 includes two springs 501, which are respectively disposed on the transmission shafts 104 on both sides of the shear bar 105. The two springs 501 abut against the two ends of the shear bar 105, and apply elastic forces to the shear bar 105 along the axial direction of the transmission shaft 104 and in opposite directions. The base 201 is provided with a limiting ring 502, which is used to limit the stroke of the shear bar 105 so that the distance between the side edge of the fan blade 106 and the side edge of the shear bar 105 is between 0.2 mm and 0.5 mm. The elastic structure 4 employs a double-sided spring 501 design. Two springs 501 are respectively mounted on the drive shafts 104 on both sides of the shear bar 105, with their ends abutting against the end faces of the shear bar 105. They apply axial elastic forces in opposite directions to the shear bar 105, forming a bidirectional elastic buffer. Compared to a single-sided spring 501, this design provides more balanced force and faster reset, preventing the shear bar 105 from skewing and jamming after sliding, and reducing frictional heat generation caused by jamming. The limiting retaining ring 502 on the base 201 precisely limits the axial sliding stroke of the shear bar 105, strictly constraining the sliding range within a reasonable range, ensuring that the distance between the side edge of the fan blade 106 and the side edge of the shear bar 105 is always within the optimal shearing range of 0.2mm to 0.5mm.

[0033] As a preferred option, such as Figure 3 and Figure 6As shown, the inner wall of the inner tube 103 is provided with a limiting groove 6 along the axial direction of the drive shaft 104. The end of the shearing rod 105 is slidably connected to the limiting groove 6, which is used to prevent the shearing rod 105 from rotating axially around the drive shaft 104. The high-speed rotation of the fan blade 106 and its intersection with the shearing rod 105 generate shearing force, which applies a circumferential torsional force to the shearing rod 105. The limiting groove 6 firmly holds the end of the shearing rod 105, preventing it from rotating axially around the drive shaft 104. This ensures that the shearing rod 105 always maintains its initial installation angle and that its intersection position with the fan blade 106 remains precise and unchanged. This avoids sudden changes in the shearing gap and imbalance of shearing force caused by the rotation of the shearing rod 105, and reduces the severe friction and local heat accumulation caused by sudden changes in the gap.

[0034] As a preferred option, such as Figure 1 and Figure 3 As shown, the cooler 108 is a spiral heat exchange tube, which is connected to a speed regulating valve 7. The speed regulating valve 7 is used to adjust the flow rate of the coolant inside the spiral heat exchange tube. The spiral design significantly increases the contact area between the heat exchange tube and the outer wall of the tank 101, prolongs the residence time of the coolant in the heat exchange tube, improves heat absorption efficiency, and provides more uniform cooling without dead zones. It quickly removes the trace amounts of heat generated by shearing, preventing heat accumulation inside the tank 101. The spiral heat exchange tube is connected to the speed regulating valve 7, and the flow rate of the coolant inside the tube can be precisely controlled by adjusting the opening of the speed regulating valve 7 to adapt to the temperature control requirements of different operating conditions.

[0035] As a preferred option, such as Figure 3 and Figure 5 As shown, a temperature sensor 8 is installed at the bottom of the drive shaft 104. The temperature sensor 8 is used to detect the real-time temperature of the hydraulic oil inside the tank 101. The temperature sensor 8 is electrically connected to a controller, which is electrically connected to the speed regulating valve 7. The controller has a preset temperature value. When the real-time temperature value is higher than the preset temperature value, the controller controls the opening of the speed regulating valve 7 to increase. When the temperature sensor 8 detects that the real-time temperature value is higher than the preset temperature, the controller immediately issues a command to automatically increase the opening of the speed regulating valve 7, accelerate the flow rate of the coolant in the spiral heat exchange tube, quickly dissipate the accumulated heat, and reduce the temperature inside the tank 101. The entire process achieves automatic temperature regulation, further reduces temperature fluctuations, and provides precise and stable temperature control, avoiding the decomposition and failure of additives due to high temperatures, and maximizing the product quality of the flame-retardant hydraulic fluid.

[0036] As a preferred option, such as Figure 3As shown, a thermally conductive silicone layer 9 is provided between the spiral heat exchange tube and the outer wall of the tank 101. The trace amount of heat generated by the mixture inside the tank 101 is quickly conducted to the thermally conductive silicone layer 9 through the wall of the tank 101, and then efficiently transferred to the coolant inside the spiral heat exchange tube by the silicone layer. The heat conduction is faster and more uniform, avoiding local heat accumulation and greatly improving the overall heat exchange efficiency. Combined with the low heat generation shear design, the temperature of the tank 101 is doubly guaranteed to be stable.

[0037] The present invention also provides a method for using an additive addition device for preparing flame-retardant hydraulic fluid, comprising the following steps: Inject a fixed amount of basic hydraulic oil into the tank 101 to ensure that the hydraulic oil level is higher than the top of the inner tube 103; Additives are slowly added through the feed inlet according to the formula to avoid agglomeration and accumulation. The distance between the side edge of the fan blade 106 and the side edge of the shear bar 105 is controlled between 0.2 mm and 0.5 mm. The cooler 108 is set to a target temperature of 30°C to 50°C. The linkage stability of the power unit 107 and the drive shaft 104 is tested. Start the power unit 107 and cooler 108. The drive shaft 104 drives the fan blade 106 to rotate coaxially with the inner tube 103. The fan blade 106 generates axial thrust to drive the hydraulic oil to flow downward along the inner tube 103. After turning at the bottom of the tank, it flows upward from the gap formed between the inner tube 103 and the inner wall of the tank body 101 and flows into the top of the inner tube 103 to form a closed loop circulation, so that the additives can flow without dead angles. During the cycle, a continuous high shear field is formed between the staggered fan blades 106 and the shear bar 105. The continuous high shear field is used to shear and impact the mixed liquid flow, so that the agglomerates are broken up and the mixed liquid is repeatedly sheared. Cooler 108 is attached to the outer wall of tank 101, continuously absorbing shear heat and controlling the temperature within a preset range, with fluctuations not exceeding ±2℃, to prevent the additives from decomposing at high temperatures.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. An additive addition device for preparing flame-retardant hydraulic fluid, comprising a tank, wherein the tank is vertically arranged and has a feed inlet, characterized in that, Also includes: The inner tube is located inside the inner cavity of the tank and communicates with the inner cavity of the tank. There is a gap between the outer wall of the inner tube and the inner wall of the tank. The top of the inner tube is lower than the top of the tank, and the axis of the inner tube is parallel to the axis of the tank. The shearing mechanism includes a drive shaft, multiple shearing rods, and multiple sets of fan blades. The drive shaft is coaxially arranged with the inner tube and rotatably connected to the inner tube. The multiple shearing rods are arranged along the axial direction of the inner tube, and each shearing rod is connected to the inner wall of the inner tube. The multiple sets of fan blades are arranged along the axial direction of the drive shaft, and the multiple sets of fan blades are spaced apart from the multiple shearing rods. The multiple fan blades in each set are arranged circumferentially along the drive shaft and connected to the drive shaft. The power unit is connected to the drive shaft. When the power unit drives multiple fan blades to rotate through the drive shaft, the fan blades apply a thrust toward the bottom of the tank to the hydraulic oil in the inner tube. Each fan blade can intersect with the adjacent shear bar. When the fan blade intersects with the adjacent shear bar, the distance between the side edge of the fan blade and the side edge of the shear bar is 0.2 mm to 0.5 mm. A cooler is installed on the outer wall of the tank body to cool the tank body.

2. The additive addition equipment for preparing flame-retardant hydraulic fluid as described in claim 1, characterized in that, A base is fixed to the drive shaft, and the base has a through hole along the radial direction of the drive shaft. The fan blade is connected to a rotating shaft, which is rotatably connected to the through hole. The fan blade is connected to a drive unit, which is used to drive each fan blade to rotate radially around the drive shaft to adjust the angle between each fan blade and the cross section of the drive shaft. When the fan blade rotates with the drive shaft to intersect with the adjacent shear bar, the cross section of the fan blade is perpendicular to the cross section of the drive shaft. When the fan blade rotates with the drive shaft to the side away from the shear bar, the angle between the cross section of the fan blade and the drive shaft is an acute angle.

3. The additive addition equipment for preparing flame-retardant hydraulic fluid as described in claim 2, characterized in that, The drive unit includes a cam groove and a drive slider. The cam groove is located on the inner wall of the inner tube, and the drive slider is slidably connected in the cam groove. The drive slider is fixedly connected to the fan blade. When the fan blade rotates with the drive shaft to intersect with the adjacent shear bar, the fan blade is perpendicular to the cross section of the drive shaft under the action of the drive slider and the cam groove.

4. The additive addition equipment for preparing flame-retardant hydraulic fluid as described in claim 1, characterized in that, The shearing rod is provided with a sliding hole, and the shearing rod is slidably connected to the drive shaft along the axial direction of the drive shaft through the sliding hole. The drive shaft is provided with an elastic structure, which is used to apply an elastic force along the axial direction of the drive shaft to the shearing rod so that the distance between the side edge of the fan blade and the side edge of the adjacent shearing rod can be adjusted between 0.2 mm and 0.5 mm.

5. The additive addition equipment for preparing flame-retardant hydraulic fluid as described in claim 4, characterized in that, The elastic structure includes two springs, which are respectively disposed on the drive shafts on both sides of the shear bar. The two springs abut against the two ends of the shear bar and apply elastic forces to the shear bar along the axial direction of the drive shaft and in opposite directions. The base is provided with a limiting ring, which is used to limit the stroke of the shear bar so that the distance between the side edge of the fan blade and the side edge of the adjacent shear bar is between 0.2 mm and 0.5 mm.

6. The additive addition equipment for preparing flame-retardant hydraulic fluid as described in claim 1, characterized in that, The inner wall of the inner tube is provided with a limiting groove along the axial direction of the drive shaft. The end of the shearing rod is slidably connected to the limiting groove, which is used to prevent the shearing rod from rotating around the axial direction of the drive shaft.

7. The additive addition equipment for preparing flame-retardant hydraulic fluid as described in claim 1, characterized in that, The cooler is a spiral heat exchange tube, which is connected to a speed regulating valve. The speed regulating valve is used to adjust the flow rate of the coolant in the spiral heat exchange tube.

8. The additive addition equipment for preparing flame-retardant hydraulic fluid as described in claim 1, characterized in that, A temperature sensor is provided at the bottom of the drive shaft. The temperature sensor is used to detect the real-time temperature value of the hydraulic oil in the inner cavity of the tank. The temperature sensor is electrically connected to a controller. The controller is electrically connected to the speed control valve. A preset temperature value is set in the controller. When the real-time temperature value is higher than the preset temperature value, the controller controls the opening of the speed control valve to increase.

9. The additive addition equipment for preparing flame-retardant hydraulic fluid as described in claim 1, characterized in that, A thermally conductive silicone layer is provided between the spiral heat exchange tube and the outer wall of the tank.

10. A method of using the additive addition equipment for preparing flame-retardant hydraulic fluid as described in claim 1, characterized in that, Includes the following steps: Inject a fixed amount of basic hydraulic oil into the tank to ensure that the hydraulic oil level is higher than the top of the inner pipe; Add the additive slowly through the feed inlet according to the formula to avoid additive agglomeration and accumulation. Control the distance between the side edge of the fan blade and the side edge of the shear bar to 0.2mm to 0.5mm. Set the cooler to a target temperature of 30℃ to 50℃ and test the linkage stability of the power unit and the drive shaft. When the power unit and cooler are started, the drive shaft drives the fan blades to rotate coaxially with the inner tube. The fan blades generate axial thrust to drive the hydraulic oil to flow downward along the inner tube. After turning at the bottom of the tank, the oil flows upward from the gap between the inner tube and the inner wall of the tank, and flows into the top of the inner tube to form a closed loop circulation, so that the additives can flow without dead corners. During the cycle, a continuous high shear field is formed between the staggered fan blades and the shear bars. The continuous high shear field is used to shear and impact the mixed liquid flow, so that the agglomerates are broken up and the mixed liquid is repeatedly sheared. The cooler fits against the outer wall of the tank and continuously absorbs shear heat, keeping the temperature within a preset range with fluctuations not exceeding ±2℃, thus preventing the additives from decomposing at high temperatures.

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