Colloid grinding equipment and process based on pressure and thermal expansion real-time compensation

Abstract

The invention discloses colloid grinding equipment and technology based on pressure and thermal expansion real-time compensation. The equipment comprises a movable grinding disc, a static grinding disc and a power unit. On one hand, on the basis of the engineering compensation model, according to the pressure and temperature of the actual working environment, the target gap is dynamically adjusted, the tooth gap change caused by thermal deformation is automatically calculated and compensated, and the preset threshold value is actively adapted based on the deviation formed between the actual gap and the target gap, so that real-time automatic adjustment of the gap is formed, and shutdown is not needed; and on the other hand, on the basis of dynamic monitoring and automatic adjustment of the gap, the optimal grinding performance of the colloid grinding equipment under different materials and working conditions can be obtained, and the stability and the high efficiency of the grinding process and the consistency of the product quality are greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of colloidal material processing, specifically relating to a colloidal grinding device based on pressure and thermal expansion real-time compensation, and also to a colloidal grinding process based on pressure and thermal expansion real-time compensation. Background Technology

[0002] Colloid milling equipment (or simply colloid mill) can achieve both ultra-fine grinding of materials and emulsification and homogenization. It is a high-shear fluid processing device that integrates shearing, grinding, and dispersion. In short, the colloid mill applies strong shearing force, friction force, and high-frequency vibration to fluid or semi-fluid materials through the precise gap between the high-speed rotating rotor (moving grinding disc) and the stationary stator (stationary grinding disc), so that the materials are effectively crushed, dispersed, and homogenized.

[0003] However, in the production process of modified bitumen waterproof membrane, asphalt, SBS, SBR and other polymer modifiers and fillers need to be subjected to high-speed shearing and fine grinding to form a uniform, fine and stable adhesive. At the same time, the core working parts of the adhesive grinding equipment are a pair of moving and stationary toothed discs with specific tooth structure. The gap between the two (tooth gap) directly determines the grinding fineness and production efficiency of the adhesive.

[0004] Currently, most grinding equipment in the industry uses relatively crude and traditional methods for adjusting tooth backlash, which mainly have the following problems: 1. The adjustment accuracy is low. It is usually estimated by manually rotating a large nut with a scale or a feeler gauge. The adjustment accuracy is low and it relies heavily on the experience of the operator. It is difficult to ensure the consistency between product batches. Over time, the adjustment error becomes large and it may even be impossible to know the true data. 2. It cannot be dynamically adjusted online, and the machine must be stopped when adjusting. It cannot make real-time and dynamic adjustments during the production process according to the characteristics of the material (such as viscosity and temperature) or changes in production requirements, which affects production efficiency and flexibility. 3. Low level of digitalization, lack of accurate displacement detection and feedback mechanism, and inability to display and record backlash values ​​in a digital form, which is not conducive to realizing digital management and quality traceability of the production process; 4. Poor thermal expansion compensation: The equipment will generate thermal expansion during operation, causing the tooth gap adjusted in the cold state to change in the hot state. Traditional methods cannot automatically compensate for this, affecting the stability of grinding quality. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an improved colloid grinding device based on pressure and real-time thermal expansion compensation.

[0006] The present invention also relates to a colloidal grinding process based on pressure and thermal expansion real-time compensation.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A pressure- and thermal expansion-compensated colloid grinding device includes a moving grinding disc, a stationary grinding disc, and a power unit. The power unit includes a power shaft and a main actuator. The moving grinding disc is mounted at the output end of the power shaft, and the output end of the power shaft is maintained by a high-temperature bellows mechanical seal that moves synchronously with the power shaft and rotates relative to it. The colloid grinding device also includes a pressure sensor, a temperature sensor, a power sleeve that rotates and slides relative to the power shaft based on a bearing connection, an auxiliary actuator that drives the power sleeve to move along the length of the power shaft, a displacement sensor, and a controller. The pressure sensor, temperature sensor, and auxiliary actuator are linked together, and the controller is defined. The difference between the actual clearance and the target clearance is the deviation. The clearance is then increased or decreased in real time based on the deviation and a preset threshold. The target clearance is calculated as follows: G_target = G_base + k*(P_actual - P_nominal) + m*(T_actual - T_nominal), where G_target is the target clearance, G_base is the base clearance, k is the pressure correction coefficient, m is the temperature correction coefficient, P_actual is the actual pressure, P_nominal is the nominal pressure, T_actual is the actual temperature, and T_nominal is the nominal temperature.

[0008] Preferably, during the operation of the colloid mill, a displacement sensor collects gap data at least 10 times per second and transmits the data to the controller. The controller compares the actual gap G_actual with the target gap G_target and calculates the deviation ΔG=G_actual-G_target.

[0009] Furthermore, the controller sends a command to the auxiliary power unit, and calculates the adjustment amount as ΔS=ΔG / r based on the deviation ΔG, where ΔS is the execution step amount and r is the mechanical transmission ratio.

[0010] According to a specific embodiment and preferred aspect of the invention, closed-loop control is employed during the adjustment process, and the gap is remeasured immediately after execution, iterating until the deviation is less than a threshold.

[0011] In some implementations, each iteration takes less than 5 seconds.

[0012] According to another specific embodiment and preferred aspect of the present invention, the auxiliary power unit includes a movable seat fixedly mounted on the moving tool sleeve and a linear motion assembly that drives the movable seat to move along the length direction of the power shaft.

[0013] Preferably, the linear motion assembly includes an adjusting shaft parallel to the length direction of the power shaft, a motor, and a worm gear reducer for relative transmission between the motor and the adjusting shaft, wherein the worm is coaxially connected to the adjusting shaft, and the motor drives the worm gear to rotate.

[0014] Furthermore, the displacement sensor includes a fixed base and a telescopic rod mounted on the fixed base and a movable base at both ends, wherein the extension length of the telescopic rod is used to obtain the axial displacement of the power shaft.

[0015] The extension and retraction direction of the telescopic rod is parallel to the axial direction of the power shaft.

[0016] According to another specific embodiment and preferred aspect of the invention, a pressure sensor is mounted on a stationary grinding disc, wherein a plurality of pressure sensors are arranged in an array, and P_actual is obtained as the actual pressure.

[0017] Preferably, the temperature sensor extends into the grinding chamber from the outside, avoiding the moving and stationary grinding discs, to obtain the actual temperature of the colloid inside the grinding chamber, T_actual.

[0018] Furthermore, high-temperature bellows mechanical seals are a type of sealing method based on bellows. A bellows is a pipe formed by a series of corrugations, possessing high flexibility and plasticity. When the bellows contracts or expands, the sealing element also changes accordingly, thus achieving a sealing effect. In a high-temperature bellows mechanical seal, the bellows is fixed to a sealing surface, which is located between the rotor and the stationary ring. When the rotor rotates, the sealing surface also rotates, compressing the bellows and achieving a sealing effect. This sealing method has advantages such as good sealing performance, long service life, and low maintenance costs.

[0019] Another technical solution of the present invention is: a colloid grinding process based on pressure and thermal expansion real-time compensation, which uses colloid grinding equipment and includes the following steps: 1) The operator inputs the target backlash value through the human-machine interface. After receiving the instruction, the auxiliary power adjusts the position of the moving grinding disc relative to the stationary grinding disc based on the length direction of the power shaft to achieve the required backlash size. 2) After the colloid is added to the grinding chamber, the actual pressure is obtained by the pressure sensor and the actual temperature is obtained by the temperature sensor. The target gap is calculated based on the formula G_target=G_base+k*(P_actual-P_nominal)+m*(T_actual-T_nominal), where G_target is the target gap, G_base is the base gap, k is the pressure correction coefficient, m is the temperature correction coefficient, P_actual is the actual pressure, P_nominal is the nominal pressure, T_actual is the actual temperature, and T_nominal is the nominal temperature. 3) Based on the engineering compensation model in step 2), during the operation of the colloid mill, a displacement sensor collects gap data at least 10 times per second and transmits the data to the controller. The controller compares the actual gap G_actual with the target gap G_target and calculates the deviation ΔG=G_actual-G_target. At the same time, the adjustment amount is obtained using the formula ΔS=ΔG / r, where ΔS is the execution step amount and r is the mechanical transmission ratio. Finally, the pressure sensor, temperature sensor, and auxiliary power unit are linked together, and the difference between the actual gap and the target gap obtained by the controller is defined as the deviation. The gap is then increased or decreased in real time based on the deviation and a preset threshold.

[0020] In short, the operator inputs the target backlash value through the human-machine interface. After receiving the command, the controller drives the motor to rotate, which in turn moves the moving grinding disc towards the stationary grinding disc through a screw pair or worm gear structure. The displacement sensor monitors the actual position of the stationary grinding disc in real time and continuously feeds the data back to the controller. The controller compares the feedback value with the target value and uses an algorithm to precisely control the rotation and stopping of the motor until the actual backlash reaches the target value, achieving precise positioning. At the same time, during the grinding process, the pressure sensor monitors the working pressure between the grinding discs in real time. If the pressure rises abnormally and exceeds the set safety threshold due to changes in material properties or the entry of foreign objects, the controller will immediately instruct the motor to rotate in the opposite direction, rapidly increasing the backlash to provide overload protection and prevent equipment damage. In addition, the temperature sensor monitors the equipment temperature, and the control unit automatically fine-tunes and compensates for the backlash based on the thermal expansion model of the material to ensure that the working backlash under hot conditions is consistent with the set value. For example, during production, if the pressure sensor detects that the pressure exceeds 1.0 MPa (set value), the PLC (controller) immediately controls the motor to reverse and quickly retract the grinding disc to increase the pressure relief in the tooth gap; if the temperature sensor detects that the machine body temperature rises to 120°C, the PLC (controller) automatically calculates the compensation amount (e.g., 0.01 mm) based on the pre-input material expansion coefficient and controls the servo motor to feed an additional 0.01 mm to offset the actual increase in tooth gap caused by thermal expansion, ensuring that the effective working tooth gap is always stable at 0.5 mm.

[0021] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: In existing colloid milling processes, the tooth gap (or clearance) adjustment is characterized by low precision. It typically relies on manual rotation of a graduated nut or feeler gauge for rough estimation, heavily depending on operator experience. This makes it difficult to guarantee batch-to-batch consistency, leading to large adjustment errors over time and even making it impossible to obtain accurate data. Furthermore, online dynamic adjustment is not possible; the machine must be stopped during adjustment, preventing real-time, dynamic adjustments based on material characteristics (such as viscosity and temperature) or changes in production requirements, thus impacting production efficiency and flexibility. Additionally, the low level of digitization, lacking precise displacement detection and feedback mechanisms, prevents the tooth gap value from being displayed and recorded digitally, hindering digital management and quality traceability. Finally, poor thermal expansion compensation is a significant drawback. Thermal expansion during operation causes changes in the tooth gap adjusted at cold temperatures, which traditional methods cannot automatically compensate for, affecting the stability of grinding quality. This invention, based on a pressure and thermal expansion real-time compensation colloid milling device, cleverly solves these shortcomings. Using this colloid milling device, the operator first inputs the target tooth gap value through a human-machine interface, and the auxiliary power receives the command... Afterwards, the position of the moving grinding disc relative to the stationary grinding disc is adjusted based on the length direction of the power shaft to achieve the required gap size. After the colloid is added to the grinding chamber, the actual pressure is obtained by the pressure sensor and the actual temperature is obtained by the temperature sensor. The target gap is calculated based on the formula G_target=G_base+k*(P_actual-P_nominal)+m*(T_actual-T_nominal), where G_target is the target gap. Finally, the difference between the actual gap and the target gap obtained by the controller is the deviation. The gap is then increased or decreased in real time based on the deviation and a preset threshold. Therefore, this invention, on the one hand, is based on an engineering compensation model to dynamically adjust the target gap according to the pressure and temperature of the actual working environment, automatically calculates and compensates for the tooth gap change caused by thermal deformation, and actively adapts to the preset threshold based on the deviation between the actual gap and the target gap to form real-time automatic adjustment of the gap without stopping the machine. On the other hand, based on the dynamic monitoring and automatic adjustment of the gap, it can not only obtain the best grinding performance of the colloid grinding equipment under different materials and working conditions, but also significantly improve the stability, efficiency and consistency of the grinding process and product quality. Attached Figure Description

[0022] Figure 1 This is a schematic cross-sectional view of the colloid grinding equipment of the present invention; Figure 2 This is a flowchart illustrating the colloidal grinding process of the present invention. The components include: 1. Moving grinding disc; 2. Stationary grinding disc; 3. Power unit; 30. Power shaft; 4. High-temperature bellows mechanical seal; 5. Pressure sensor; 6. Displacement sensor; 60. Fixed base; 61. Telescopic rod; 7. Power sleeve; 8. Auxiliary power unit; 80. Moving base; 81. Linear motion assembly; 810. Adjusting shaft; 811. Motor; 812. Worm gear reducer. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] 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, the scope of which is defined by the appended claims and their equivalents. The invention will now be further described in detail with reference to the embodiments given in the accompanying drawings.

[0025] like Figure 1 As shown, the pressure and thermal expansion real-time compensation type colloid grinding equipment of this embodiment includes a moving grinding disc 1, a stationary grinding disc 2, a power unit 3, a high-temperature bellows mechanical seal 4, a pressure sensor 5, a displacement sensor 6, a temperature sensor, a power sleeve 7, an auxiliary power unit 8, and a controller.

[0026] Specifically, the power unit 3 includes a power shaft 30 and a main power unit. The moving grinding disc 1 is installed at the output end of the power shaft 30. The output end of the power shaft 30 is maintained by a high-temperature bellows mechanical seal 4 that moves axially synchronously with the power shaft 30 and rotates relative to the power shaft 30. The stationary grinding disc 2 is matched with the moving grinding disc 1, and a tooth gap is formed between them. The power sleeve 7 is based on the bearing 9 and rotates and slides relative to the power shaft 30. The auxiliary power unit 8 is used to drive the power sleeve 7 to move along the length of the power shaft 30.

[0027] In some specific embodiments, the auxiliary power unit 8 includes a movable seat 80 fixedly mounted on the moving tool sleeve 7 and a linear motion component 81 that drives the movable seat 80 to move along the length direction of the power shaft 30. In short, as long as linear transmission can be achieved, the specific structure is not limited, such as: telescopic cylinder, lead screw structure, worm gear, etc.

[0028] In this example, the linear motion assembly 81 includes an adjustment shaft 810 parallel to the length direction of the power shaft 30, a motor 811, and a worm gear reducer 812 for relative transmission between the motor 811 and the adjustment shaft 810, wherein the worm is coaxially connected to the adjustment shaft 810, and the motor 811 drives the worm gear to rotate.

[0029] The displacement sensor 6 includes a fixed base 60 and a telescopic rod 61 mounted at both ends on the fixed base 60 and the movable base 80. The telescopic length of the telescopic rod 61 is used to obtain the axial displacement of the power shaft. The telescopic direction of the telescopic rod 61 is parallel to the axial direction of the power shaft 30. A pressure sensor 5 is mounted on the stationary grinding disc 2, with multiple pressure sensors 5 arranged in an array to obtain P_actual as the actual pressure. A temperature sensor extends from the outside into the grinding chamber, avoiding the moving and stationary grinding discs, to obtain T_actual as the actual temperature of the colloid inside the grinding chamber.

[0030] The high-temperature bellows mechanical seal 4 is a sealing method based on bellows. A bellows is a pipe formed by a series of corrugations, possessing high flexibility and plasticity. When the bellows contracts or expands, the seal also changes accordingly, thus achieving a sealing effect. In the high-temperature bellows mechanical seal, the bellows is fixed to the sealing surface, which is located between the rotor and the stationary ring. When the rotor rotates, the sealing surface also rotates, compressing the bellows and achieving a sealing effect. This sealing method has advantages such as good sealing effect, long service life, and low maintenance cost.

[0031] Combination Figure 2 As shown, the colloidal grinding process based on real-time compensation for pressure and thermal expansion utilizes colloidal grinding equipment and includes the following steps: 1) The operator inputs the target backlash value through the human-machine interface. After receiving the instruction, the auxiliary power adjusts the position of the moving grinding disc relative to the stationary grinding disc based on the length direction of the power shaft to achieve the required backlash size. 2) After the colloid is added to the grinding chamber, the actual pressure is obtained by the pressure sensor and the actual temperature is obtained by the temperature sensor. The target gap is calculated based on the formula G_target=G_base+k*(P_actual-P_nominal)+m*(T_actual-T_nominal), where G_target is the target gap, G_base is the base gap, k is the pressure correction coefficient, m is the temperature correction coefficient, P_actual is the actual pressure, P_nominal is the nominal pressure, T_actual is the actual temperature, and T_nominal is the nominal temperature. 3) Based on the engineering compensation model in step 2), during the operation of the colloid mill, a displacement sensor collects gap data at least 10 times per second and transmits the data to the controller. The controller compares the actual gap G_actual with the target gap G_target and calculates the deviation ΔG=G_actual-G_target. At the same time, the adjustment amount is obtained using the formula ΔS=ΔG / r, where ΔS is the execution step amount and r is the mechanical transmission ratio. Finally, the pressure sensor, temperature sensor, and auxiliary power unit are linked together, and the difference between the actual gap and the target gap obtained by the controller is defined as the deviation. The gap is then increased or decreased in real time based on the deviation and a preset threshold.

[0032] Furthermore, during the operation of the colloid mill, a displacement sensor collects gap data at least 10 times per second and transmits the data to the controller. The controller compares the actual gap G_actual with the target gap G_target and calculates the deviation ΔG = G_actual - G_target. The controller then sends a command to the auxiliary power unit, calculating the adjustment amount ΔS = ΔG / r based on the deviation ΔG, where ΔS is the step size and r is the mechanical transmission ratio.

[0033] In addition, closed-loop control is used during the adjustment process, and the gap is remeasured immediately after execution. The iteration continues until the deviation is less than the threshold, with each iteration taking less than 5 seconds (generally 4s~5s).

[0034] In this example, by adding an integrated limit switch, the gap adjustment is prevented from exceeding the safe range (e.g., minimum gap 0.1mm, maximum 5mm), avoiding grinding disc collision or overload. At the same time, the controller records multiple adjustment data and uses machine learning models (e.g., neural networks) to optimize the correction coefficient, achieving adaptive adjustment for new materials. Then, during shutdown or maintenance, the system automatically resets the gap to the default value and generates an adjustment log for monitoring or performance analysis.

[0035] In short, the operator inputs the target backlash value through the human-machine interface. After receiving the command, the controller drives the motor to rotate, which in turn moves the moving grinding disc towards the stationary grinding disc through a screw pair or worm gear structure. The displacement sensor monitors the actual position of the stationary grinding disc in real time and continuously feeds the data back to the controller. The controller compares the feedback value with the target value and uses an algorithm to precisely control the rotation and stopping of the motor until the actual backlash reaches the target value, achieving precise positioning. At the same time, during the grinding process, the pressure sensor monitors the working pressure between the grinding discs in real time. If the pressure rises abnormally and exceeds the set safety threshold due to changes in material properties or the entry of foreign objects, the controller will immediately instruct the motor to rotate in the opposite direction, rapidly increasing the backlash to provide overload protection and prevent equipment damage. In addition, the temperature sensor monitors the equipment temperature, and the control unit automatically fine-tunes and compensates for the backlash based on the thermal expansion model of the material to ensure that the working backlash under hot conditions is consistent with the set value. For example, during production, if the pressure sensor detects that the pressure exceeds 1.0 MPa (set value), the PLC (controller) immediately controls the motor to reverse and quickly retract the grinding disc to increase the pressure relief in the tooth gap; if the temperature sensor detects that the machine body temperature rises to 120°C, the PLC (controller) automatically calculates the compensation amount (e.g., 0.01 mm) based on the pre-input material expansion coefficient and controls the servo motor to feed an additional 0.01 mm to offset the actual increase in tooth gap caused by thermal expansion, ensuring that the effective working tooth gap is always stable at 0.5 mm.

[0036] In summary, when using this colloid grinding equipment, the operator first inputs the target backlash value through the human-machine interface. Upon receiving the command, the auxiliary power system adjusts the position of the moving grinding disc relative to the stationary grinding disc based on the length of the power shaft to achieve the desired backlash size. After the colloid is added to the grinding chamber, the pressure sensor obtains the actual pressure, and the temperature sensor obtains the actual temperature. The target backlash is calculated based on the formula G_target=G_base+k*(P_actual-P_nominal)+m*(T_actual-T_nominal), where G_target is the target backlash. Finally, the difference between the actual backlash and the target backlash obtained by the controller is the deviation. The backlash is then increased or decreased in real time based on the deviation and a preset threshold. Therefore, this invention... Based on an engineering compensation model, the target gap is dynamically adjusted according to the pressure and temperature of the actual working environment. It automatically calculates and compensates for backlash changes caused by thermal deformation. Moreover, it actively adapts to preset thresholds based on the deviation between the actual gap and the target gap to achieve real-time automatic gap adjustment without stopping the machine. On the other hand, based on the dynamic monitoring and automatic adjustment of the gap, it can not only obtain the optimal grinding performance of the colloid grinding equipment under different materials and working conditions, but also significantly improve the stability, efficiency and consistency of the grinding process and product quality. Thirdly, it can realize a high-precision, digital, online dynamic adjustment and thermal compensation function backlash adjustment device, which is of great significance for improving the product quality and production automation level of colloids (e.g., modified bitumen waterproof membranes).

[0037] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A pressure, thermal expansion real-time compensation based colloidal milling apparatus comprising a moving grinding plate, a stationary grinding plate, a power unit, wherein the power unit comprises a power shaft and a main power driver, wherein the moving grinding plate is mounted on the output end of the power shaft, characterized in that, The output end of the power shaft is connected with a high-temperature bellows mechanical seal which keeps synchronous axial movement with the power shaft and rotates relative to the power shaft; the colloidal grinding device further comprises a pressure sensor, a temperature sensor, a power sleeve which is butted against the bearing and rotates and slides relative to the power shaft, an auxiliary power device which drives the power sleeve to move along the length direction of the power shaft, a displacement sensor, and a controller; the pressure sensor, the temperature sensor, and the auxiliary power device are linked together, and the difference between the actual gap and the target gap obtained by the controller is defined as the deviation, and the deviation and the preset threshold value are compared to increase or decrease the gap in real time; the target gap calculation formula is: G_target=G_base+k*(P_actual-P_nominal)+m*(T_actual-T_nominal), wherein G_target is the target gap, G_base is the base gap, k is the pressure correction coefficient, m is the temperature correction coefficient, P_actual is the actual pressure, P_nominal is the nominal pressure, T_actual is the actual temperature, and T_nominal is the nominal temperature.

2. The pressure, thermal expansion real-time compensation based colloidal milling apparatus according to claim 1, wherein, During the operation of the colloidal mill, the displacement sensor collects gap data at least 10 times per second and transmits the data to the controller; the controller compares the actual gap G_actual with the target gap G_target and calculates the deviation ΔG=G_actual-G_target.

3. The pressure, thermal expansion real-time compensation based colloidal milling apparatus according to claim 2, wherein, The controller sends an instruction to the auxiliary power device, and calculates the adjustment amount ΔS=ΔG / r according to the deviation ΔG, wherein ΔS is the execution step amount and r is the mechanical transmission ratio.

4. The pressure, thermal expansion real-time compensation based colloidal milling apparatus according to claim 3, wherein, During the adjustment process, closed-loop control is adopted, and the gap is immediately re-measured after execution, and iteration is performed until the deviation is less than the threshold value.

5. The pressure, thermal expansion real-time compensation based colloidal milling apparatus according to claim 4, wherein, The time used for each iteration is within 5 seconds.

6. The pressure, thermal expansion real-time compensation based colloidal milling apparatus according to claim 1, wherein, The auxiliary power device comprises a moving seat fixedly installed on the moving knife sleeve and a linear motion assembly which drives the moving seat to move along the length direction of the power shaft.

7. The pressure, thermal expansion real-time compensation based colloidal milling apparatus according to claim 6, wherein, The linear motion assembly comprises an adjusting shaft parallel to the length direction of the power shaft, a motor, and a worm and gear reducer for relatively transmission connection between the motor and the adjusting shaft, wherein the worm is coaxially connected with the adjusting shaft, and the motor drives the worm to rotate.

8. The pressure, thermal expansion real-time compensation based colloidal milling apparatus according to claim 7, wherein, The displacement sensor comprises a fixed seat, an expansion rod installed on the fixed seat and the moving seat at both ends, wherein the expansion length of the expansion rod is used to obtain the axial movement displacement of the power shaft; and / or the expansion direction of the expansion rod is parallel to the axial direction of the power shaft.

9. The pressure, thermal expansion real-time compensation based colloidal milling apparatus according to claim 8, wherein, The pressure sensor is installed on the static grinding disc, wherein a plurality of pressure sensors are arranged in an array and are used to obtain the actual pressure P_actual; and / or the temperature sensor extends into the grinding cavity from the outside and avoids the dynamic grinding disc and the static grinding disc to obtain the actual temperature T_actual of the colloidal in the grinding cavity.

10. A pressure, thermal expansion real-time compensation based colloidal milling process, characterized in that, The method comprises the following steps: 1) The operator inputs the target gap value through the human-machine interface, and the auxiliary power receives the instruction and adjusts the position of the dynamic grinding disc relative to the static grinding disc based on the length direction of the power shaft to achieve the required intermittent size. 2) After the colloid is added into the grinding chamber, the actual pressure is obtained by the pressure sensor, the actual temperature is obtained by the temperature sensor, and the target gap is calculated based on the formula G_target=G_base+k*(P_actual-P_nominal)+m*(T_actual-T_nominal), wherein G_target is the target gap, G_base is the base gap, k is the pressure correction coefficient, m is the temperature correction coefficient, P_actual is the actual pressure, P_nominal is the nominal pressure, T_actual is the actual temperature, and T_nominal is the nominal temperature; 3) Based on the engineering compensation model of step 2), during the operation of the colloid mill, the displacement sensor collects gap data at least 10 times per second, and transmits the data to the controller. The controller compares the actual gap G_actual with the target gap G_target, calculates the deviation ΔG=G_actual-G_target, and uses the formula ΔS=ΔG / r to obtain the adjustment amount, wherein ΔS is the execution step amount, and r is the mechanical transmission ratio. Finally, the pressure sensor, the temperature sensor, and the auxiliary power device are linked together, and the difference between the actual gap and the target gap obtained by the controller is defined as the deviation. Then, based on the comparison between the deviation and the preset threshold, the gap is increased or decreased in real time.

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