Cooling gas automatic control device of injection mixer

Abstract

The invention belongs to the technical field of injection mixers, particularly relates to an automatic control device for cooling gas of an injection mixer, and aims to solve the problems of bearing blockage, difficulty in restarting and the like caused by sudden drop of the temperature of a bearing and rapid solidification of a lubricating material due to continuous supply of the cooling gas in the background technology. A variable frequency motor is arranged on the outer wall of one end of the mixer body, and a main air inlet pipe is arranged on one side of the mixer body. The bearing part can be prevented from being overcooled after abnormal shutdown, it is ensured that lubricating materials are kept in a molten state, and the bearing is prevented from being stuck during restarting. Intelligent response can be made according to abnormal working conditions, the heat preservation state of the bearing is maintained, the PLC dynamically adjusts the heating power and the airflow rate, temperature closed-loop control is achieved, the optimal lubricating effect is ensured, high-pressure airflow is directionally jetted to internal gaps of the bearing mounting base through the multiple cleaning nozzles, and solidified materials are effectively removed.

Description

Technical Field

[0001] The invention relates to the technical field of injection mixers, in particular to a cooling air automatic control device for an injection mixer. Background Art

[0002] Injection mixers are critical equipment for material mixing in the chemical and pharmaceutical industries. Their core function is to achieve uniform mixing of various materials through a high-speed rotating agitator. During the mixing process, bearings, as core components supporting rotating parts, generate significant frictional heat due to prolonged high-speed operation. This heat needs to be dissipated through a cooling air system to prevent overheating and bearing damage. Traditional cooling air systems typically use a constant airflow cooling system. While this provides basic heat dissipation, it has significant shortcomings under complex operating conditions.

[0003] For example, when equipment shuts down abnormally due to power fluctuations (swings) or inverter failures, the continued supply of cooling air can cause a sudden drop in bearing temperature, rapidly solidifying lubricants (such as high-temperature molten grease), which can lead to bearing seizure and restart difficulties. Furthermore, residual material can easily accumulate in the bearing gaps after shutdown, making it difficult to clean. Long-term accumulation can affect the life of the equipment. Existing cooling air systems often rely on manual or simple solenoid valve control and lack intelligent response mechanisms. This makes them unable to cope with sudden abnormal operating conditions (such as power swings). Furthermore, the cleaning of residual material often relies on manual intervention, which is inefficient and poses safety risks. Therefore, there is an urgent need for a cooling air automatic control device that integrates intelligent control, abnormal response, and automatic cleaning functions to address these technical bottlenecks. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides an injection mixer cooling gas automatic control device, which overcomes the shortcomings of the existing technology and effectively solves the problems that the continuous supply of cooling gas will cause the bearing temperature to drop sharply, causing the lubricating material to solidify rapidly, and then causing the bearing to get stuck and restart to be difficult.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An automatic control device for cooling air of an injection mixer comprises a mixer body, a variable frequency motor being provided on the outer wall of one end of the mixer body, a main air intake pipe being provided on one side of the mixer body, a coil being fixedly connected to the outer wall of the main air intake pipe via a flange, an air intake branch pipe being fixedly connected to the outer wall of one end of the coil via a flange, a heating assembly being provided on the outside of the coil, and a bearing mounting seat being fixedly connected to the end of the air intake branch pipe away from the coil via a flange; An exhaust pipe is installed at the air outlet of the bearing mounting seat, and a cleaning mechanism is provided on the outer wall of the exhaust pipe. A bearing component is provided inside the bearing mounting seat. A main control solenoid valve is installed on the outer wall of the main air inlet pipe, and a first sub-control solenoid valve is installed at the end of the exhaust pipe away from the bearing mounting seat. A shaking frequency converter is installed on the outer wall of the variable frequency motor, and an abnormality alarm contact is provided on the top of the shaking frequency converter. A PLC controller is installed on one side outer wall of the variable frequency motor. The abnormality alarm contact of the shaking frequency converter is electrically connected to the main control solenoid valve. When the shaking frequency converter detects an abnormality, the abnormality alarm contact triggers a closing signal, and the main control solenoid valve immediately closes to cut off the cooling air supply to maintain the thermal insulation state of the bearing component.

[0006] Preferably, the heating assembly includes a base frame, equidistantly spaced heating rods mounted on the bottom inner wall of the base frame, and a sealing cover screwed to the top outer wall of the base frame. The coil is positioned between the base frame and the sealing cover, with the heating rods located at the bottom of the coil. The heating rods are connected to a PLC controller. Before the equipment is started, the PLC controller activates the heating rods according to a preset program, heating the gas in the coil to a set temperature and ensuring that the lubricant for the bearing remains molten.

[0007] Preferably, the bearing mounting seat includes a lower mounting seat, an upper mounting seat and a positioning piece, wherein the lower mounting seat and the upper mounting seat are fixedly connected to the inner wall of the mixer body by screws, and the upper mounting seat is located on the top outer wall of the lower mounting seat, and the positioning piece includes two and is respectively arranged on the top of the lower mounting seat and the top of the upper mounting seat, wherein the outer walls of the lower mounting seat and the upper mounting seat are provided with positioning grooves, and the positioning piece is tightly attached to the inner wall of the positioning groove, and a first temperature sensor is installed on the top outer wall of the upper mounting seat, and the bottom end of the first temperature sensor is located in the annular gap between the bearing mounting seat and the bearing member.

[0008] Preferably, the cleaning mechanism includes a return branch pipe, an annular pipe, a second solenoid valve and a cleaning nozzle, wherein the return branch pipe is welded to the outer wall of the exhaust pipe, the annular pipe is welded to the outer wall of one end of the return branch pipe, and the cleaning nozzles distributed at equal distances are arranged on one side of the annular pipe, and the cleaning nozzles are plugged into the inner wall of one side of the bearing mounting seat. The second solenoid valve is installed on the outer wall of the return branch pipe, and the annular pipe is connected to the main air intake pipe through the second solenoid valve. When the equipment is shut down, the PLC controller controls the second solenoid valve to open, so that part of the cooling gas is ejected through the cleaning nozzle to remove the solidified material remaining in the bearing mounting seat.

[0009] Preferably, a second temperature sensor is installed on the outer wall of the intake branch pipe, and a third temperature sensor is installed on the outer wall of the exhaust pipe. The PLC controller is connected to the second temperature sensor, the third temperature sensor and the main control solenoid valve signal.

[0010] Preferably, the bearing assembly includes a bearing outer ring, a bearing inner ring and balls, wherein the bearing outer ring is arranged at the inner center of the bearing mounting seat, the bearing inner ring is arranged on the inner side of the bearing outer ring, and the balls distributed at equal distances are slidably connected to the inner wall between the bearing inner ring and the bearing outer ring.

[0011] Preferably, a heat-conducting ring is bonded to the outer wall of the bearing outer ring, and heat-conducting fins are circumferentially distributed on the outer wall of the heat-conducting ring.

[0012] Preferably, a first feed port is provided on the outer wall of the top of the mixer body, and a second feed port is provided on the outer wall of one side of the mixer body, a discharge port is provided on the outer wall of the bottom of the mixer body, a main shaft is provided in the inner ring of the bearing of the bearing member, an agitator is installed on the outer wall of the main shaft, the agitator is provided inside the mixer body, and the main shaft is fixedly connected to the output shaft of the variable frequency motor through a coupling.

[0013] The beneficial effects of the present invention are: The cooling air automatic control device for the injection mixer of the present invention utilizes a linkage design between a shaking frequency converter and a main control solenoid valve. When a frequency converter anomaly, such as voltage fluctuation, is detected, the abnormal alarm contact immediately triggers a closing signal, and the main control solenoid valve quickly cuts off the cooling air supply. This mechanism prevents excessive cooling of bearing components after abnormal shutdowns, ensures that the lubricating material remains in a molten state, and avoids bearing jamming during restart. Combined with the logical control of the PLC controller, the system can determine the fault type in real time and perform targeted actions, significantly improving equipment reliability. It can also intelligently respond to abnormal operating conditions and maintain the bearing's thermal insulation state. The cooling air automatic control device for the injection mixer of the present invention integrates a heating rod and coil in the heating assembly, and preheats the gas to the set temperature through a PLC controller before the equipment is started. The preheated gas is evenly heated by the coil before entering the bearing mounting seat, causing the lubricating material in the bearing to melt rapidly while avoiding local overheating. Second and third temperature sensors monitor the temperature of the intake manifold and exhaust manifold respectively, and provide real-time feedback to the PLC controller, dynamically adjusting the heating power and airflow rate to achieve closed-loop temperature control and ensure optimal lubrication. The present invention's automatic cooling air control system for an injection mixer features a cleaning mechanism consisting of a return branch, an annular pipe, and cleaning nozzles. After shutdown, a PLC controller activates a second solenoid valve, directing some cooling air into the annular pipe. Multiple cleaning nozzles direct high-pressure airflow into the internal gaps of the bearing mount, effectively removing solidified material. This design eliminates the need for manual intervention, improves cleaning efficiency, and prevents bearing wear or clogging caused by residue. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of a cooling gas automatic control device for an injection mixer proposed by the present invention; Figure 2This is a schematic diagram of the internal connection structure of the mixer body of the injection mixer cooling gas automatic control device proposed by the present invention; Figure 3 This is a schematic diagram of the connection structure of the heating component and the bearing mounting seat of the cooling air automatic control device of the injection mixer proposed by the present invention; Figure 4 This is a schematic diagram of the connection structure of the main air intake pipe, coil pipe and air intake branch pipe of the cooling air automatic control device of the injection mixer proposed by the present invention; Figure 5 This is a schematic diagram of the disassembled structure of the heating component of the cooling gas automatic control device for an injection mixer proposed by the present invention; Figure 6 Schematic diagram of the air inlet and outlet coordination structure of the bearing mounting seat of the cooling air automatic control device of the injection mixer proposed by the present invention Figure 1 ; Figure 7 Schematic diagram of the air inlet and outlet coordination structure of the bearing mounting seat of the cooling air automatic control device of the injection mixer proposed by the present invention Figure 2 ; Figure 8 Schematic diagram of the disassembled structure of the bearing mounting seat of the cooling air automatic control device of the injection mixer proposed by the present invention Figure 1 ; Figure 9 Schematic diagram of the disassembled structure of the bearing mounting seat of the cooling air automatic control device of the injection mixer proposed by the present invention Figure 2 ; Figure 10 This is an enlarged schematic diagram of the structure of part A of the cooling air automatic control device for an injection mixer proposed by the present invention.

[0015] Figure: 1, mixer body; 2, variable frequency motor; 3, main air inlet pipe; 4, coil; 5, air inlet branch pipe; 6, heating assembly; 61, bottom frame; 62, heating rod; 63, sealing cover; 7, bearing mounting seat; 71, lower mounting seat; 72, upper mounting seat; 73, positioning piece; 74, first temperature sensor; 8, exhaust pipe; 9, cleaning mechanism; 91, return branch pipe; 92, annular pipe; 93, second solenoid valve; 94, cleaning spray Head; 10. Bearing; 11. Main control solenoid valve; 12. First sub-control solenoid valve; 13. Shaking frequency converter; 14. Abnormal alarm contact; 15. Second temperature sensor; 16. Third temperature sensor; 17. PLC controller; 18. Bearing outer ring; 19. Bearing inner ring; 20. Ball; 21. Heat transfer ring; 22. Heat transfer fin; 23. First feed port; 24. Second feed port; 25. Discharge port; 26. Agitator. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] Example 1, refer to Figures 1-8 , an injection mixer cooling air automatic control device, comprising a mixer body 1, a variable frequency motor 2 is provided on the outer wall of one end of the mixer body 1, a main air intake pipe 3 is provided on one side of the mixer body 1, and a coil 4 is fixedly connected to the outer wall of the main air intake pipe 3 through a flange, an air intake branch pipe 5 is fixedly connected to the outer wall of one end of the coil 4 through a flange, a heating component 6 is provided on the outside of the coil 4, and a bearing mounting seat 7 is fixedly connected to the end of the air intake branch pipe 5 away from the coil 4 through a flange; An exhaust pipe 8 is installed at the air outlet of the bearing mounting seat 7, and a cleaning mechanism 9 is provided on the outer wall of the exhaust pipe 8. A bearing part 10 is provided inside the bearing mounting seat 7. A main control solenoid valve 11 is installed on the outer wall of the main air intake pipe 3, and a first sub-control solenoid valve 12 is installed at the end of the exhaust pipe 8 away from the bearing mounting seat 7. A shaking frequency converter 13 is installed on the outer wall of the variable frequency motor 2, and an abnormal alarm contact 14 is provided on the top of the shaking frequency converter 13. A PLC controller 17 is installed on the outer wall of one side of the variable frequency motor 2. The abnormal alarm contact 14 of the shaking frequency converter 13 is electrically connected to the main control solenoid valve 11. When the shaking frequency converter 13 detects an abnormality, the abnormal alarm contact 14 triggers a closing signal, and the main control solenoid valve 11 is immediately closed to cut off the cooling air supply to maintain the thermal insulation state of the bearing part 10.

[0018] A variable-frequency motor 2 is mounted at one end of the mixer body 1, its output shaft connected to the agitator 26 via a coupling. A main air intake pipe 3 is flanged to a coil 4, which wraps around a heating element 6. An air intake branch 5 delivers preheated air to a bearing mount 7. A first separate solenoid valve 12 is located at the outlet of the exhaust pipe 8. A swaying inverter 13 monitors the motor's operating status in real time. If an anomaly, such as a voltage drop, is detected, the abnormality alarm contact 14 closes, immediately closing the main solenoid valve 11 and cutting off the cooling air supply. Simultaneously, a PLC controller 17 initiates the insulation program.

[0019] Example 2, refer to Figure 4-Figure 5A cooling air automatic control device for an injection mixer is disclosed. The heating assembly 6 includes a base frame 61, equidistantly spaced heating rods 62 mounted on the bottom inner wall of the base frame 61, and a sealing cover 63 screwed to the top outer wall of the base frame 61. The coil 4 is disposed between the base frame 61 and the sealing cover 63, with the heating rods 62 located at the bottom of the coil 4. The heating rods 62 are connected to a PLC controller 17 by signal. Before the equipment is started, the PLC controller 17 activates the heating rods 62 according to a preset program, heating the gas in the coil 4 to a set temperature and ensuring that the lubricating material of the bearing component 10 remains molten.

[0020] Heating rods 62 are evenly distributed along the inner wall of the base frame 61, with the coil 4 positioned between the base frame 61 and a sealing cover 63. Before the equipment starts, the PLC controller 17 activates the heating rods 62 according to a preset program based on the intake air temperature feedback from the second temperature sensor 15, raising the air temperature to a set value, such as 80°C. The sealing cover 63 is secured with screws to ensure that heat is concentratedly transferred to the coil 4, preventing energy loss.

[0021] Example 3, refer to Figure 8 , a cooling air automatic control device for an injection mixer, the bearing mounting seat 7 includes a lower mounting seat 71, an upper mounting seat 72 and a positioning piece 73, wherein the lower mounting seat 71 and the upper mounting seat 72 are fixedly connected to the inner wall of the mixer body 1 by screws, and the upper mounting seat 72 is located on the top outer wall of the lower mounting seat 71, and the positioning piece 73 includes two and is respectively arranged on the top of the lower mounting seat 71 and the top of the upper mounting seat 72, wherein the outer walls of the lower mounting seat 71 and the upper mounting seat 72 are provided with a positioning groove, and the positioning piece 73 is tightly attached to the inner wall of the positioning groove, and a first temperature sensor 74 is installed on the outer wall of the top of the upper mounting seat 72, and the bottom end of the first temperature sensor 74 is located in the annular gap between the bearing mounting seat 7 and the bearing member 10.

[0022] The lower and upper mounting blocks 71 and 72 are fixed to the inner wall of the mixer body 1 with screws. A positioning plate 73 is inserted into a positioning groove to ensure accurate centering. A first temperature sensor 74 is mounted on the top of the upper mounting block 72. Its probe extends into the gap between the bearing 10 and the mounting block to monitor the lubricant temperature in real time. If the temperature falls below a threshold, the PLC controller 17 activates the heater 62 to provide additional heat.

[0023] Reference Figure 9The cleaning mechanism 9 includes a reflux branch pipe 91, an annular pipe 92, a second solenoid valve 93 and a cleaning nozzle 94, wherein the reflux branch pipe 91 is welded to the outer wall of the exhaust pipe 8, the annular pipe 92 is welded to the outer wall of one end of the reflux branch pipe 91, and the cleaning nozzles 94 are evenly distributed on one side of the annular pipe 92, and the cleaning nozzles 94 are plugged into the inner wall of one side of the bearing mounting seat 7. The second solenoid valve 93 is installed on the outer wall of the reflux branch pipe 91, and the annular pipe 92 is connected to the main air intake pipe 3 through the second solenoid valve 93. When the equipment is shut down, the PLC controller 17 controls the second solenoid valve 93 to open, so that part of the cooling gas is ejected through the cleaning nozzle 94 to remove the solidified material remaining in the bearing mounting seat 7.

[0024] After shutdown, the PLC controller 17 sends a command to open the second solenoid valve 93. Cooling air flows through the return branch 91 into the annular pipe 92 and is sprayed into the bearing gap by multiple cleaning nozzles 94. The high-pressure airflow impacts any remaining material, dislodging it and discharging it through the exhaust pipe 8. The cleaning duration is preset by the PLC, and upon completion, the second solenoid valve 93 automatically closes.

[0025] Reference Figure 7 A second temperature sensor 15 is installed on the outer wall of the intake branch pipe 5, and a third temperature sensor 16 is installed on the outer wall of the exhaust pipe 8. The PLC controller 17 is signal-connected to the second temperature sensor 15, the third temperature sensor 16 and the main control solenoid valve 11.

[0026] Reference Figure 10 The bearing component 10 includes a bearing outer ring 18, a bearing inner ring 19 and balls 20, wherein the bearing outer ring 18 is arranged at the inner center of the bearing mounting seat 7, the bearing inner ring 19 is arranged on the inner side of the bearing outer ring 18, and the balls 20 distributed at equal distances are slidably connected to the inner wall between the bearing inner ring 19 and the bearing outer ring 18.

[0027] Reference Figure 10 A heat-conducting ring 21 is bonded to the outer wall of the bearing outer ring 18 , and heat-conducting fins 22 are distributed circumferentially on the outer wall of the heat-conducting ring 21 .

[0028] A heat-conducting ring 21 is bonded to the outer wall of the bearing outer ring 18, and its circumferentially distributed heat-conducting fins 22 increase the heat dissipation area. Heat is evenly transferred to the bearing mounting seat 7 through the heat-conducting fins 22, preventing local overheating and accelerating the heat exchange efficiency between the cooling air and the bearing.

[0029] Reference Figure 1A first feed port 23 is provided on the outer wall of the top of the mixer body 1, and a second feed port 24 is provided on the outer wall of one side of the mixer body 1. A discharge port 25 is provided on the outer wall of the bottom of the mixer body 1. A main shaft is provided in the inner ring 19 of the bearing 10, and an agitator 26 is installed on the outer wall of the main shaft. The agitator 26 is provided inside the mixer body 1, and the main shaft is fixedly connected to the output shaft of the variable frequency motor 2 through a coupling.

[0030] Working principle: Normal operation stage: The main control solenoid valve 11 is opened, and the cooling air is delivered to the inside of the bearing mounting seat 7 through the main air intake pipe 3 and the air intake branch pipe 5, so as to cool the bearing 10 at a constant temperature, thereby preventing the bearing from being damaged by excessive temperature and ensuring the normal and stable operation of the equipment; Start-up preheating stage: The PLC controller 17 starts the heating rod 62 to preheat the gas in the coil 4 to the set temperature to ensure that the lubricating material is melted and the auxiliary injection mixer can work stably when it is started; Abnormal response stage: After the swaying inverter 13 detects an abnormality, it immediately closes the main control solenoid valve 11, cuts off the cooling air and maintains the bearing in a heat preservation state; Shutdown and cleaning phase: the PLC controller 17 activates the second solenoid valve 93 , uses high-pressure airflow to clean the residual materials inside the bearing component 10 , and discharges them through the exhaust pipe 8 .

[0031] During the entire process, the PLC controller 17 integrates the data from the first temperature sensor 74, the second temperature sensor 15 and the third temperature sensor 16, dynamically adjusts the heating, cooling and cleaning actions, realizes fully automated control, and ensures efficient and stable operation of the equipment.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0034] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An automatic control device for cooling air of an injection mixer, comprising a mixer body (1), characterized in that: A variable frequency motor (2) is provided on the outer wall of one end of the mixer body (1), a main air intake pipe (3) is provided on one side of the mixer body (1), and a coil (4) is fixedly connected to the outer wall of the main air intake pipe (3) via a flange, an air intake branch pipe (5) is fixedly connected to the outer wall of one end of the coil (4) via a flange, a heating component (6) is provided on the outside of the coil (4), and an end of the air intake branch pipe (5) away from the coil (4) is fixedly connected to a bearing mounting seat (7) via a flange; The air outlet of the bearing mounting seat (7) is installed with an exhaust pipe (8), and a cleaning mechanism (9) is provided on the outer wall of the exhaust pipe (8); a bearing component (10) is provided inside the bearing mounting seat (7); a main control solenoid valve (11) is installed on the outer wall of the main air inlet pipe (3), and a first sub-control solenoid valve (12) is installed at one end of the exhaust pipe (8) away from the bearing mounting seat (7); a shaking frequency converter (13) is installed on the outer wall of the variable frequency motor (2), and an abnormal alarm contact (14) is provided on the top of the shaking frequency converter (13); a PLC controller (17) is installed on one side of the outer wall of the variable frequency motor (2); the abnormal alarm contact (14) of the shaking frequency converter (13) is electrically connected to the main control solenoid valve (11); when the shaking frequency converter (13) detects an abnormality, the abnormal alarm contact (14) triggers a closing signal, and the main control solenoid valve (11) is immediately closed to cut off the cooling air supply, thereby maintaining the heat preservation state of the bearing component (10).

2. The cooling gas automatic control device for an injection mixer according to claim 1, characterized in that: The heating assembly (6) includes a bottom frame (61), heating rods (62) installed on the inner wall of the bottom of the bottom frame (61) at equal distances, and a sealing cover (63) fixedly connected to the outer wall of the top of the bottom frame (61) by screws, wherein the coil (4) is arranged between the bottom frame (61) and the sealing cover (63), and the heating rod (62) is located at the bottom of the coil (4). The heating rod (62) is connected to the PLC controller (17) by signal. Before the equipment is started, the PLC controller (17) starts the heating rod (62) according to a preset program, heats the gas in the coil (4) to a set temperature, and ensures that the lubricating material of the bearing component (10) is in a molten state.

3. The cooling gas automatic control device for an injection mixer according to claim 1, characterized in that: The bearing mounting seat (7) includes a lower mounting seat (71), an upper mounting seat (72) and a positioning piece (73), wherein the lower mounting seat (71) and the upper mounting seat (72) are both fixedly connected to the inner wall of the mixer body (1) by screws, and the upper mounting seat (72) is located on the top outer wall of the lower mounting seat (71), and the positioning piece (73) includes two and is respectively arranged on the top of the lower mounting seat (71) and the top of the upper mounting seat (72), wherein the outer walls of the lower mounting seat (71) and the upper mounting seat (72) are both provided with a positioning groove, and the positioning piece (73) is tightly attached to the inner wall of the positioning groove, and a first temperature sensor (74) is installed on the top outer wall of the upper mounting seat (72), and the bottom end of the first temperature sensor (74) is located in the annular gap between the bearing mounting seat (7) and the bearing member (10).

4. The cooling gas automatic control device for an injection mixer according to claim 1, characterized in that: The cleaning mechanism (9) includes a return branch pipe (91), an annular pipe (92), a second solenoid valve (93) and a cleaning nozzle (94), wherein the return branch pipe (91) is welded to the outer wall of the exhaust pipe (8), the annular pipe (92) is welded to the outer wall of one end of the return branch pipe (91), the cleaning nozzles (94) are evenly distributed and arranged on one side of the annular pipe (92), and the cleaning nozzles (94) are plugged into the inner wall of one side of the bearing mounting seat (7), the second solenoid valve (93) is installed on the outer wall of the return branch pipe (91), the annular pipe (92) is connected to the main air intake pipe (3) through the second solenoid valve (93), and when the equipment is shut down, the PLC controller (17) controls the second solenoid valve (93) to open, so that part of the cooling air is ejected through the cleaning nozzle (94) to remove the solidified material remaining in the bearing mounting seat (7).

5. The cooling air automatic control device for an injection mixer according to claim 1, characterized in that: A second temperature sensor (15) is installed on the outer wall of the intake branch pipe (5), and a third temperature sensor (16) is installed on the outer wall of the exhaust pipe (8). The PLC controller (17) is signal-connected to the second temperature sensor (15), the third temperature sensor (16) and the main control solenoid valve (11).

6. The cooling gas automatic control device for an injection mixer according to claim 1, characterized in that: The bearing member (10) comprises a bearing outer ring (18), a bearing inner ring (19) and balls (20), wherein the bearing outer ring (18) is arranged at the inner center of the bearing mounting seat (7), the bearing inner ring (19) is arranged on the inner side of the bearing outer ring (18), and the balls (20) are equidistantly distributed and slidably connected to the inner wall between the bearing inner ring (19) and the bearing outer ring (18).

7. The cooling gas automatic control device for an injection mixer according to claim 6, characterized in that: A heat-conducting ring (21) is bonded to the outer wall of the bearing outer ring (18), and heat-conducting fins (22) are distributed circumferentially on the outer wall of the heat-conducting ring (21).

8. The cooling air automatic control device for an injection mixer according to claim 1, characterized in that: The top outer wall of the mixer body (1) is provided with a first feed port (23), and the outer wall of one side of the mixer body (1) is provided with a second feed port (24), and the bottom outer wall of the mixer body (1) is provided with a discharge port (25), a main shaft is provided in the inner ring (19) of the bearing member (10), and an agitator (26) is installed on the outer wall of the main shaft, and the agitator (26) is provided inside the mixer body (1), and the main shaft is fixedly connected to the output shaft of the variable frequency motor (2) through a coupling.

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