Automatic temperature control stirring mixer
By introducing a hollow closed sandwich structure and multi-layer deflector design into the mixing mixer, combined with the inlet and outlet pipes and control valves, the precise temperature control and safety protection of lithium-ion battery electrode paste is achieved, which solves the shortcomings in temperature control and safety of traditional mixers and improves the quality and performance of battery electrode materials.
Patent Information
- Application Number
- CN202422024034.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-21
AI Technical Summary
Traditional mixing machines have shortcomings in temperature control accuracy and adapting to the temperature regulation requirements of different materials, which has affected the quality and performance of lithium-ion battery electrode slurry.
An automatic temperature-controlled stirring mixer is designed, using a hollow enclosed sandwich structure and a multi-layer deflector. Combined with the water inlet and outlet pipes, the flow rate and temperature of the refrigerant medium are adjusted through a control valve and a flowmeter to achieve accurate temperature control; at the same time, multiple protective measures are set up to ensure safe use.
It realizes rapid and precise temperature and stirring speed control of different materials, improves the safety and service performance of the mixer, and ensures the quality and performance of the battery electrode material.
Smart Images
Figure CN223082695U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mixing and stirring, in particular to an automatic temperature-controlled stirring mixer. Background Art
[0002] The positive and negative electrode slurries of lithium-ion battery electrodes are basically composed of active substances, polymer binders, conductive agents, etc. The preparation of the positive and negative electrode slurries includes a series of process steps such as the mutual mixing, dissolution, and dispersion between liquid and liquid, liquid and solid materials. Among them, the accuracy of temperature control during the mixing process is the main factor affecting product quality. The mixing temperature not only affects the fluidity and viscosity of the positive and negative slurries, but also affects aspects such as the chemical properties, mechanical properties, and electrochemical properties of the electrode materials. Therefore, it is necessary to precisely control the mixing temperature to ensure the quality of the slurry and the performance of the battery. At present, traditional stirring mixers adopt a single temperature control method, with poor accuracy and inability to meet the requirements of temperature regulation for different material mixing. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide an automatic temperature-controlled stirring mixer that can quickly and accurately control the mixing temperature and stirring speed, and the mixer can meet the requirements of temperature regulation for different material mixing.
[0004] In the preparation process of positive and negative electrode slurries of lithium-ion battery electrodes, it is necessary to put active substances, polymer binders, conductive agents and other raw materials into a closed container according to the material ratio and the order of addition, and fully stir them to mix them evenly. The stage from the addition of the material to the next material is defined as a stirring stage. In the process from the beginning to the end of the addition of the material, multiple stirring stages will be experienced. The stirring temperature required to match each stirring stage is different. In order to accurately control the stirring temperature of each stirring stage, this scheme is improved and designed on the basis of the traditional mixer. The traditional mixer usually includes: a machine base, a stirring barrel fixedly installed on the machine base, and a barrel cover sealed and locked on the top open mouth of the stirring barrel by a locking cover mechanism and a sealing device, and a material feeding port is arranged on the barrel cover; a stirring device for stirring the material in the stirring barrel is arranged at the bottom of the stirring barrel, a discharge port is opened on the side wall of the bottom end of the stirring barrel, and a discharge device is installed at the discharge port. On this basis, this solution designs the barrel wall of the mixing barrel into a double-layer structure with a hollow closed interlayer; a number of guide plates are arranged in sequence from top to bottom in the hollow closed interlayer, and each guide plate divides the hollow closed interlayer from top to bottom into a number of independent and closed flow channel cavities; a guide port is provided on each guide plate, and each guide port can connect the upper and lower flow channel cavities separated by the guide plate where the guide port is located, and the guide ports on two adjacent guide plates are staggered in upper and lower positions; an inlet pipe and an outlet pipe are provided on the outer barrel wall of the mixing barrel, and the inlet pipe is connected to the flow channel cavity located at the bottom layer in the mixing barrel, and the outlet pipe is connected to the flow channel cavity located at the top layer in the mixing barrel. The automatic temperature control stirring and mixing machine is not only suitable for the preparation of positive and negative electrode slurries in the production of battery electrode materials, but also suitable for other mixed materials that need to adjust and control temperature changes during the mixing process.
[0005] A first flow rate regulating control valve, a first flow meter and a first water temperature control display are installed on the water inlet pipe; a second flow rate regulating control valve, a second flow meter and a second water temperature control display are installed on the water outlet pipe; a radar level sensor for measuring the material level in the mixing barrel is arranged on the top of the barrel cover; a point-contact pressure instrument for measuring the pressure in the mixing barrel is arranged on the top of the barrel cover; and a thermocouple for measuring the temperature of the material in the mixing barrel is arranged on the barrel wall of the mixing barrel.
[0006] The signal lines of the first flow rate regulating control valve, the second flow rate regulating control valve, the first flow meter, the second flow meter, the first water temperature control display instrument, the second water temperature control display instrument, the thermocouple, the radar level sensor, and the point-contact pressure gauge are all connected to a control system with a display screen; among them, the control system with a display screen is usually referred to as a PLC touch screen system in the industry, which is a mature technology in the control field. The control system is set with the respective set temperatures of the materials in the mixing tank at different stages of mixing. The control system can receive the signals fed back by the thermocouple in real time and process them, and then compare and judge the processed data with the set temperature corresponding to the materials at this mixing stage. When the temperature detected by the thermocouple is inconsistent with the set temperature corresponding to the materials at this mixing stage, the control system issues instructions to the first flow rate regulating control valve and the second flow rate regulating control valve to adjust the opening degrees of the first flow rate regulating control valve and the second flow rate regulating control valve until the temperature detected by the thermocouple is consistent with the set temperature at this mixing stage.
[0007] In addition, the control system can receive the signals fed back by the first flow rate regulating control valve, the second flow rate regulating control valve, the first flow meter, the second flow meter, the first water temperature control display instrument, the second water temperature control display instrument, the thermocouple, the radar level sensor, and the point-contact pressure gauge in real time and process them, and then display the opening degrees of the first flow rate regulating control valve, the opening degrees of the second flow rate regulating control valve, the flow rate and temperature of the water inlet at the water inlet pipe, the flow rate and temperature of the water outlet at the water outlet pipe, the temperature of the materials in the mixing tank, the level of the materials in the mixing tank, and the pressure in the mixing tank in the form of data on the display screen in real time.
[0008] During the mixing process, when the actual mixing temperature (i.e., the actual temperature of the materials in the mixing tank at the corresponding mixing stage) is lower than the theoretically required mixing temperature (i.e., the set temperature of the materials at the above corresponding mixing stage), the refrigerant medium entering the hollow closed interlayer through the water inlet pipe plays a heating role. During the mixing process, when the actual mixing temperature is higher than the theoretically required mixing temperature, the refrigerant medium entering the hollow closed interlayer through the water inlet pipe plays a cooling role.
[0009] Furthermore, for the aforementioned automatic temperature-controlled stirring and mixing machine, the distance from the top surface to the bottom surface of each flow channel cavity is the same, and the diversion openings on two adjacent diversion plates are staggered by 180° vertically; the position of the diversion opening on the diversion plate at the bottommost flow channel cavity is staggered by 180° vertically from the position of the water inlet pipe; the position of the diversion opening on the diversion plate at the uppermost flow channel cavity is staggered by 180° vertically from the position of the water outlet pipe. With the above settings, the water flow path can be maximally extended in a limited space, improving the cooling or heating effect of the refrigerant medium.
[0010] In addition, for the convenience of the connection layout and subsequent management of the external water circulation pipeline, in this solution, the water outlet pipe is located directly above the water inlet pipe, and at this time, all external water circulation pipelines can be concentrated on one side.
[0011] Furthermore, for the aforementioned automatic temperature-controlled stirring and mixing machine, a sewage discharge pipe communicating with the bottommost flow channel cavity is provided on the bottom of the mixing barrel, and a sewage discharge valve is installed on the sewage discharge pipe. The sewage discharge valve is normally closed during the normal operation of the automatic temperature-controlled stirring and mixing machine, and is only opened when the sewage in the hollow closed interlayer needs to be discharged.
[0012] To extend the service life of the mixing machine, in this solution, a tungsten carbide coating is sprayed on the surfaces of all components in the mixing barrel that can come into contact with the material, on the inner barrel wall of the mixing barrel, on the inner wall of the barrel cover, and on the inner wall of the feeding port of the barrel cover, and the surface of the tungsten carbide coating is polished until the surface roughness of the tungsten carbide coating is less than 0.8 μm, and the thickness of the polished tungsten carbide coating is 0.3 ± 0.05 mm.
[0013] In addition, the mixing barrel is composed of an inner barrel and an outer barrel, forming a double-layer structure with a hollow closed interlayer. The inner barrel is made of stainless steel, and the wall thickness of the inner barrel is 8 mm; the outer barrel is made of carbon steel, and the wall thickness of the outer barrel is 6 mm.
[0014] This solution also provides an observation port on the barrel cover, which is closed by tempered glass with a scraper and lighting; a spare port is provided on the barrel cover, and the spare port also serves as a sampling port, and the spare port is blocked by a flange.
[0015] Furthermore, for the aforementioned automatic temperature-controlled stirring and mixing machine, the structure of the stirring device is as follows: a vertically placed stirring shaft is sealed and supported in a through hole at the bottom of the mixing barrel through bearings and a sealing structure, and the stirring shaft extending downward outside the mixing barrel is driven to rotate by a driving device. A stirring paddle group is provided on the stirring shaft located inside the mixing barrel; the stirring paddle group includes three stirring paddles arranged from top to bottom, and each stirring paddle is provided with two paddle blades, and the two paddle blades in each stirring paddle are rotationally symmetrically distributed; the paddle blades in two adjacent stirring paddles above and below are staggered by 90° vertically.
[0016] The driving device includes: a variable-frequency motor installed on the machine base. The motor shaft of the variable-frequency motor extends into the machine base. The lower end of the stirring shaft extends into the machine base. The transmission for transmitting the power on the motor shaft of the variable-frequency motor to the stirring shaft is located inside the machine base. An induction disc is fixedly installed on the stirring shaft at the machine base. An induction notch is provided on the induction disc. A first proximity switch is provided on the machine base at the position of the induction disc. The signal line of the first proximity switch is connected to the control system. The signal line of the variable-frequency motor is connected to the control system through a variable-frequency speed regulator. The control system is set with the set speed corresponding to the stirring shaft at different stirring stages. Each time the induction disc rotates one circle, the first proximity switch senses once. The control system can receive the signal feedback by the first proximity switch in real time and process it, and then compare and judge the data obtained after processing with the set speed corresponding to the stirring shaft at this stirring stage. When the rotation speed of the stirring shaft detected by the first proximity switch is inconsistent with the set speed corresponding to the stirring shaft at this stirring stage, the control system issues an instruction to the variable-frequency speed regulator to adjust the rotation speed of the variable-frequency motor through the variable-frequency speed regulator until the rotation speed of the stirring shaft detected by the first proximity switch is consistent with the set speed corresponding to the stirring shaft at this stirring stage. At the same time, the control system can display the rotation speed of the variable-frequency motor and the rotation speed of the stirring shaft in real time in the form of data on the display screen.
[0017] For a mixing machine with the bucket cover lifted and lowered by a cylinder, the connection structure between the bucket cover and the mixing bucket is as follows: the cylinder block of the cylinder is fixed on the outer barrel wall of the mixing bucket, and the bearing seat is fixed on the top of the piston rod of the cylinder. A connecting seat with a connection hole is provided on the bucket cover. The bottom of the rotating shaft sequentially passes through the connection hole and the bushing and then extends into the bearing seat and is fixedly connected to the inner ring of the bearing in the bearing seat. An external thread section is provided on the upper section of the rotating shaft. After the top of the rotating shaft extends above the connection hole, it passes through the gasket and is screwed tightly with the locking nut. A positioning pin is provided on the connecting seat, and a positioning plate with a positioning hole is provided on the outer barrel wall of the mixing bucket. When the bucket cover is correctly covered on the mixing bucket, the positioning pin is inserted into the positioning hole. This solution has taken safety measures for the safety performance problem of the opened bucket cover. Specifically, a storage rack is fixedly provided on the outer barrel wall of the mixing bucket, and a U-shaped safety support block is placed on the storage rack. After the cylinder drives the bucket cover to open upward, the U-shaped safety support block is clamped into the gap between the bearing seat and the cylinder. At this time, the bucket cover will not suddenly fall due to faults, accidental triggering of the cylinder, or other factors, ensuring the personal safety of the subsequent operators during the operation. When it is necessary to pull down the bucket cover to cover the mixing bucket, first take out the U-shaped safety support block and put it back on the storage rack again.
[0018] Further, for the aforementioned automatic temperature-controlled stirring and mixing machine, a second proximity switch is installed on the outer barrel wall of the mixing barrel or on the storage rack. When the U-shaped safety support block is placed on the storage rack, it is within the sensing area of the second proximity switch, and when the U-shaped safety support block is removed from the storage rack, it is outside the sensing area of the second proximity switch. A travel switch is installed on the outer barrel wall of the mixing barrel. When the bucket cover is correctly placed on the mixing barrel, the connecting seat presses on the contact of the travel switch. A third proximity switch is installed on the outer barrel wall of the mixing barrel. When the positioning pin inserted into the positioning hole is within the sensing area of the third proximity switch, and when the positioning pin is lifted out of the positioning hole, it is outside the sensing area of the third proximity switch. A fourth proximity switch is installed on the outer barrel wall of the outer cylinder of the mixing barrel. When the bucket cover is placed on the mixing barrel, the bearing block is within the sensing area of the fourth proximity switch, and when the bucket cover rises driven by the cylinder, the bearing block is outside the sensing area of the fourth proximity switch. The fourth proximity switch can be used to monitor whether the cylinder has descended in place.
[0019] The signal wires of the second proximity switch, the travel switch, the third proximity switch, and the fourth proximity switch are all connected to the control system. The control system can receive the signals feedback by the second proximity switch, the travel switch, the third proximity switch, and the fourth proximity switch in real time and process them. When all of the following conditions 1 to 4 are met simultaneously, the control system gives an instruction allowing the mixing machine to start, unlocks the start button of the mixing machine, and at this time, pressing the start button can start the mixing machine for stirring operations. When any one or more of the following conditions 1 to 4 are not met, the control system gives an instruction not allowing the mixing machine to start, locks the start button of the mixing machine, that is, the variable-frequency motor is locked, and at this time, pressing the start button cannot start the mixing machine for stirring operations.
[0020] Among them, the above four conditions are: Condition 1: The second proximity switch senses the U-shaped safety inner support block; Condition 2: The connecting seat presses on the contact of the travel switch to trigger the travel switch; Condition 3: The third proximity switch senses the positioning pin; Condition 4: The fourth proximity switch senses the bearing block.
[0021] The purpose of such a setting is, firstly, to ensure that the U-shaped safety support block is always on the storage rack when not in use, so that the U-shaped safety support block can be obtained immediately when needed without searching around. Secondly, it is to ensure that the mixing machine can only be allowed to perform stirring operations after the bucket cover is sealed in the correct position on the mixing barrel, playing a protective role.
[0022] Further, for the above-mentioned automatic temperature-controlled stirring and mixing machine, the lid locking mechanism is composed of a plurality of buckle locking mechanisms; the structure of each buckle locking mechanism is as follows: a locking block is fixedly arranged on the bucket lid, and a locking groove in the shape of a semi-circular channel is formed on the top surface of the locking block; an installation seat is fixedly arranged on the outer barrel wall of the mixing barrel below the locking block, the front end of the handle is hinged to the installation seat, threaded sections are respectively arranged at both ends of the rectangular buckle formed by bending a round rod, the pin shaft is movably inserted through the through hole on the handle and both ends of the pin shaft respectively extend out of the through hole on the handle, a connecting through hole is respectively formed at both ends of the pin shaft extending out of the through hole of the handle, the threaded sections at both ends of the rectangular buckle are respectively inserted through the corresponding connecting through holes and are respectively fixed to the pin shaft by two nuts; when the handle swings relative to the hinge point between the handle and the installation seat, the rectangular buckle can be clamped with the locking groove or the rectangular buckle can be disengaged from the locking groove.
[0023] A fifth proximity switch is installed on the outer barrel wall of the mixing barrel at at least one buckle locking mechanism, and the positions of the fifth proximity switches are such that when the rectangular buckle in the corresponding buckle locking mechanism is clamped with the locking groove, the position of the pin shaft is within the sensing area of the fifth proximity switch, and when the rectangular buckle is disengaged from the locking groove, the position of the pin shaft is outside the sensing area of the fifth proximity switch; the signal wire of the fifth proximity switch is connected to the control system, and the control system can receive the signals feedback by the second proximity switch, the travel switch, the third proximity switch, the fourth proximity switch, and the fifth proximity switch in real time and process them. When all of the following conditions 1 to 5 are satisfied simultaneously, the control system gives an instruction allowing the mixing machine to start, unlocks the start button of the mixing machine, and when the start button of the mixing machine is pressed, the mixing machine starts; when any one or more of the following conditions 1 to 5 are not satisfied, the control system gives an instruction not allowing the mixing machine to start, locks the start button of the mixing machine, and when the start button of the mixing machine is pressed, the mixing machine cannot start;
[0024] Condition 1: The second proximity switch senses the U-shaped safety inner support block; Condition 2: The connecting seat presses on the contact of the travel switch to trigger the travel switch; Condition 3: The third proximity switch senses the positioning pin; Condition 4: The fourth proximity switch senses the bearing seat; Condition 5: Each fifth proximity switch senses the corresponding pin shaft. The added fifth condition is to ensure that the bucket lid is sealed on the mixing barrel at the correct position and locked by each buckle locking mechanism. Only under this prerequisite condition can the mixing machine be allowed to perform the mixing operation, which also plays a protective role.
[0025] The beneficial effects of the present utility model are: ① It can adapt to different material stirring speeds and temperature control process requirements, and can quickly and accurately control to reach the required mixing temperature and stirring speed under different feeding states; ② It is provided with five-fold protection to improve the safe use performance of the mixing machine. Description of the Drawings
[0026] Figure 1 is a schematic structural view of an automatic temperature-controlled stirring and mixing machine according to the present utility model.
[0027] Figure 2 is Figure 1 a partial enlarged structural view of part A in
[0028] Figure 3 a schematic structural view of the inside of the hollow closed sandwich layer of the mixing barrel.
[0029] Figure 4 is a schematic structural view of the inside of the hollow closed sandwich layer of the mixing barrel from another viewing direction.
[0030] Figure 5 is a schematic structural view of an automatic temperature-controlled stirring and mixing machine according to the present utility model from another viewing direction.
[0031] Figure 6 is Figure 5 a partial enlarged structural view of part B in
[0032] Figure 7 is Figure 5 a partial enlarged structural view of part C in
[0033] Figure 8 a schematic structural view of the connection structure between the mixing barrel and the barrel cover.
[0034] Figure 9 a schematic structural view of the stirring shaft with a stirring paddle group.
[0035] Figure 10 is Figure 9 a partial enlarged structural view of part D in
[0036] Wherein:
[0037] 1. Machine base; 11. Display screen; 12. Variable frequency motor; 13. First proximity switch; 2. Mixing barrel; 20. Inner barrel; 201. Outer barrel; 21. Discharge opening; 22. Discharging device; 23. Deflector; 24. Deflection opening; 25. Water inlet pipe; 251. First flow rate regulating control valve; 252. First flow meter; 253. First water temperature control display instrument; 26. Water outlet pipe; 261. Second flow rate regulating control valve; 262. Second flow meter; 263. Second water temperature control display instrument; 27. Stirring paddle; 28. Induction disc; 281. Induction notch; 3. Barrel cover; 31. Radar type level sensor; 32. Point contact type pressure gauge; 33. Connecting seat; 34. Connecting hole; 35. Positioning pin; 36. Locking block; 37. Locking groove; 4. Cylinder; 41. Bearing seat; 42. Bushing; 5. Rotating shaft; 51. External thread section; 52. Gasket; 53. Locking nut; 6. Positioning plate; 61. Positioning hole; 7. Storage rack; 71. U-shaped safety support block; 81. Second proximity switch; 82. Travel switch; 83. Third proximity switch; 84. Fourth proximity switch; 85. Fifth proximity switch; 9. Handle; 90. Mounting seat; 91. Rectangular buckle; 92. Pin shaft; 93. Nut. Detailed implementation mode
[0038] The technical solution of the present utility model will be further described in detail below in conjunction with the attached drawings and preferred embodiments.
[0039] The structure of the traditional mixer includes: a machine base 1, a mixing barrel 2 fixedly installed on the machine base 1, and a barrel cover 3 sealed on the top open mouth of the mixing barrel 2 through a lock cover mechanism and a sealing device; a mixing device for mixing the materials in the mixing barrel 2 is arranged at the bottom of the mixing barrel 2, a discharge opening 21 is opened on the side wall at the bottom end of the mixing barrel 2, and a discharging device 22 is installed at the discharge opening 21. The automatic temperature control mixing machine described in this embodiment is an improvement on the basis of the traditional mixer, such as Figure 1 . Figure 3 And Figure 4 As shown, the barrel wall of the mixing barrel 2 is designed as a double-layer structure with a hollow closed interlayer; specifically, the mixing barrel 2 is composed of an inner barrel 20 and an outer barrel 201 to form a double-layer structure with a hollow closed interlayer. The inner barrel 20 is made of stainless steel material, and the wall thickness of the inner barrel 20 is 8 mm; the outer barrel 201 is made of carbon steel material, and the wall thickness of the outer barrel 201 is 6 mm.
[0040] A number of flow guiding plates 23 are sequentially arranged at intervals from top to bottom in the hollow closed interlayer. Each flow guiding plate 23 divides the hollow closed interlayer into a number of independent and closed flow channel cavities from top to bottom in sequence; a flow guiding port 24 is opened on each flow guiding plate 23, and each flow guiding port 24 can communicate with the upper and lower two flow channel cavities separated by the flow guiding plate 23 where the flow guiding port 24 is located, and the flow guiding ports 24 on two adjacent flow guiding plates 23 are staggered in the upper and lower positions; a water inlet pipe 25 and a water outlet pipe 26 are arranged on the outer barrel wall of the stirring barrel 2. The water inlet pipe 25 is communicated with the flow channel cavity at the bottommost layer in the stirring barrel 2, and the water outlet pipe 26 is communicated with the flow channel cavity at the topmost layer in the stirring barrel 2.
[0041] A more preferred solution is that the distance from the top surface to the bottom surface of each flow channel cavity is the same, and the flow guiding ports 24 on two adjacent flow guiding plates 23 are staggered 180° in the upper and lower positions; the position of the flow guiding port 24 on the flow guiding plate 23 at the bottommost flow channel cavity is staggered 180° in the upper and lower positions from the position of the water inlet pipe 25; the position of the flow guiding port 24 on the flow guiding plate 23 at the topmost flow channel cavity is staggered 180° in the upper and lower positions from the position of the water outlet pipe 26, and the water outlet pipe 26 is located directly above the water inlet pipe 25.
[0042] A sewage discharge pipe communicated with the flow channel cavity at the bottommost layer is arranged on the bottom of the stirring barrel 2, and a sewage discharge valve is installed on the sewage discharge pipe.
[0043] A first flow rate regulating control valve 251, a first flow meter 252 and a first water temperature control display instrument 253 are installed on the water inlet pipe 25; a second flow rate regulating control valve 261, a second flow meter 262 and a second water temperature control display instrument 263 are installed on the water outlet pipe 26.
[0044] A radar type level sensor 31 is arranged on the top of the barrel cover 3. After the barrel cover 3 is sealed on the stirring barrel 2, the material level in the stirring barrel 2 can be measured by the radar type level sensor 31 to accurately control the input ratio of each material during the stirring process, and the residual amount of the material in the stirring barrel 2 during the discharging process of the mixer can also be confirmed by the radar type level sensor 31, so as to ensure that the residual material in the stirring barrel 2 after the discharging of the mixer is completed ≤ ±1% of the feeding amount (≥ 200 kg).
[0045] A dot-connected pressure gauge 32 is provided on the top of the barrel cover 3. During the normal operation of the mixer, the pressure inside the mixing barrel 2 can be monitored in real time through the dot-connected pressure gauge 32. A pressure relief pipeline system is also provided on the mixing barrel 2. Once the dot-connected pressure gauge 32 detects that the pressure inside the mixing barrel 2 exceeds the set working pressure, the pressure relief pipeline system is activated to relieve the pressure, so as to ensure the safe and stable operation of the mixer. Among them, setting up the pressure relief pipeline system is a common pressure relief means for pressure-type equipment and belongs to a mature technology, so it will not be elaborated here.
[0046] A thermocouple is provided on the barrel wall of the mixing barrel 2. The thermocouple is in direct contact with the materials in the mixing barrel 2 and can monitor the temperature of the materials in the mixing barrel 2 in real time.
[0047] The signal lines of the first flow rate regulating control valve 251, the signal lines of the second flow rate regulating control valve 261, the signal lines of the first flow meter 252, the signal lines of the second flow meter 262, the signal lines of the first water temperature control display 253, the signal lines of the second water temperature control display 263, the signal line of the thermocouple, the signal line of the radar level sensor 31, and the signal line of the dot-connected pressure gauge 32 are all connected to the control system with a display screen 11; the control cabinet where the control system with a display screen 11 is located is installed on the machine base 1. In the control system, the set temperatures corresponding to the materials inside the mixing barrel 2 at different stirring stages are set. The control system can receive the signals fed back by the thermocouple in real time and process them, and then compare and judge the processed data with the set temperature corresponding to the materials at this stirring stage. When the temperature detected by the thermocouple is inconsistent with the set temperature corresponding to the materials at this stirring stage, the control system issues commands to the first flow rate regulating control valve 251 and the second flow rate regulating control valve 261 to adjust the opening degrees of the first flow rate regulating control valve 251 and the second flow rate regulating control valve 261 until the temperature detected by the thermocouple is consistent with the set temperature at this stirring stage; the control system can receive the signals fed back by the first flow rate regulating control valve 251, the signals fed back by the second flow rate regulating control valve 261, the signals fed back by the first flow meter 252, the signals fed back by the second flow meter 262, the signals fed back by the first water temperature control display 253, the signals fed back by the second water temperature control display 263, the signals fed back by the thermocouple, the signals fed back by the radar level sensor 31, and the signals fed back by the dot-connected pressure gauge 32 in real time and process them, and then display the opening degrees of the first flow rate regulating control valve 251, the opening degrees of the second flow rate regulating control valve 261, the flow rate and temperature of the water inlet at the water inlet pipe 25, the flow rate and temperature of the water outlet at the water outlet pipe 26, the temperature of the materials inside the mixing barrel 2, the material level of the materials inside the mixing barrel 2, and the pressure inside the mixing barrel 2 in the form of data on the display screen 11 in real time, so that the operator can more intuitively understand the working state of the mixer in real time.
[0048] The mixer with the above structure can adapt to the temperature control process requirements of different materials during the stirring process, meet the rapid and precise control to reach the required mixing temperature under different feeding states, and is applicable to the mixing in the pretreatment stage of battery electrode materials.
[0049] For the traditional mixer that drives the lifting of the bucket cover 3 by the cylinder 4, as shown in Figure 5 , Figure 6 and Figure 8 , the connection structure between the bucket cover 3 and the mixing barrel 2 is as follows: the cylinder body of the cylinder 4 is fixed on the outer barrel wall of the mixing barrel 2, and the bearing seat 41 is fixed on the top of the piston rod of the cylinder 4; a connection seat 33 with a connection hole 34 is arranged on the bucket cover 3, the bottom of the rotating shaft 5 sequentially passes through the connection hole 34 and the bushing 42 and then extends into the bearing seat 41, and is fixedly connected with the inner ring of the bearing in the bearing seat 41. An external thread section 51 is arranged on the upper section of the rotating shaft 5. After the top of the rotating shaft 5 extends above the connection hole 34, it passes through the gasket 52 and is screwed tightly with the locking nut 53; a positioning pin 35 is arranged on the connection seat 33, and a positioning plate 6 with a positioning hole 61 is arranged on the outer barrel wall of the mixing barrel 2. When the bucket cover 3 is correctly covered on the mixing barrel 2, the positioning pin 35 is inserted into the positioning hole 61. For this structure of driving the lifting of the bucket cover 3 by the cylinder 4, the bucket cover 3 is likely to suddenly drop due to the failure of the cylinder 4, the cylinder 4 being accidentally triggered or other factors, which poses a safety hazard. In view of this problem in this embodiment, on the basis of Embodiment 1 or Embodiment 2, a storage rack 7 is fixedly arranged on the outer barrel wall of the mixing barrel 2, as shown in Figure 5 and Figure 7 , a U-shaped safety support block 71 is placed on the storage rack 7. After the cylinder 4 drives the bucket cover 3 to open upward, the U-shaped safety support block 7 is clamped into the gap between the bearing seat 41 and the cylinder 4, and then the operator can push the bucket cover 3 in the horizontal direction to make the bucket cover rotate around the rotating shaft 5, exposing the top open mouth of the mixing barrel 2, and then perform subsequent maintenance, cleaning and other operations. Before pulling down the bucket cover 3, rotate the bucket cover 3 around the rotating shaft 5 to be directly above the mixing barrel 2, then take out the U-shaped safety support block 71 and put it back on the storage rack 7, and then start the cylinder 4 to make the bucket cover 3 descend to cover the mixing barrel 2.
[0050] The lock cover mechanism is composed of several buckle locking mechanisms; the structure of each buckle locking mechanism is as follows: A locking block 36 is fixedly arranged on the bucket cover 3, and a locking groove 37 in the shape of a semi-circular channel is formed on the top surface of the locking block 36; An installation seat 90 is fixedly arranged on the outer barrel wall of the mixing barrel 2 below the locking block 36, the front end of the handle 9 is hinged to the installation seat 90, both ends of a rectangular buckle 91 formed by bending a round rod are respectively provided with threaded sections, a pin shaft 92 is movably inserted through the through hole on the handle 9 and both ends of the pin shaft 92 respectively extend out of the through hole on the handle 9, a connecting through hole is respectively opened at both ends of the pin shaft 92 extending out of the through hole on the handle 9, and both ends of the threaded sections of the rectangular buckle 91 are respectively inserted through the corresponding connecting through holes and are respectively fixed to the pin shaft 92 by two nuts 93; When the handle 9 swings relative to the hinge point between the handle 9 and the installation seat 90, the rectangular buckle 91 can be clamped with the locking groove 37 or the rectangular buckle 91 can be separated from the locking groove 37.
[0051] In addition, during the normal operation of the mixer, the bucket cover 3 must be sealed and locked on the mixing barrel 2, otherwise it is easy to cause safety accidents. In response to this problem, this embodiment is provided with five-fold protection, specifically as follows:
[0052] As Figure 7 shown, a second proximity switch 81 is installed on the outer barrel wall of the mixing barrel 2 or on the storage rack 7. When the U-shaped safety support block 71 is placed on the storage rack 7, it is located within the sensing area of the second proximity switch 81, and after the U-shaped safety support block 71 is separated from the storage rack 7, it is located outside the sensing area of the second proximity switch 81. The second proximity switch 81 is used to monitor in real time whether the U-shaped safety support block 71 is on the storage rack 7, so that there is no situation where the operator carelessly uses the U-shaped safety support block 71 and then forgets where to put the U-shaped safety support block 71.
[0053] As Figure 6 shown, a travel switch 82 is installed on the outer barrel wall of the mixing barrel 2. When the bucket cover 3 is correctly covered on the mixing barrel 2, the connecting seat 33 presses on the contact point of the travel switch 82 at the position where the travel switch 82 is located. The travel switch 82 is used to monitor in real time whether the bucket cover 3 is covered on the mixing barrel 2.
[0054] As Figure 6 shown, a third proximity switch 83 is installed on the outer barrel wall of the mixing barrel 2. When the positioning pin 35 inserted into the positioning hole 61 is located within the sensing area of the third proximity switch 83 at the position where the third proximity switch 83 is located, and after the positioning pin 35 is separated upward from the positioning hole 61, it is located outside the sensing area of the third proximity switch 83. The third proximity switch 83 is used to monitor in real time whether the bucket cover 3 opened by rotating the rotating shaft 5 returns to the initial position when it is closed.
[0055] As Figure 6As shown in the figure, a fourth proximity switch 84 is installed on the outer cylindrical wall of the mixing barrel 2. When the bucket cover 3 covers the mixing barrel 2, the bearing seat 41 is located within the sensing area of the fourth proximity switch 84. When the bucket cover 3 rises driven by the cylinder 4, the bearing seat 41 is located outside the sensing area of the fourth proximity switch 84. The fourth proximity switch 84 is used to monitor in real time whether the cylinder drives the bucket cover 3 to descend in place.
[0056] As Figure 2 shown in the figure, a fifth proximity switch 85 is installed on the outer barrel wall of the mixing barrel 2 at at least one buckle locking mechanism. When the rectangular buckle 91 in the corresponding buckle locking mechanism is clamped with the locking groove 37, the position of the pin shaft 92 is located within the sensing area of the fifth proximity switch 85. When the rectangular buckle 91 is disengaged from the locking groove 37, the position of the pin shaft 92 is located outside the sensing area of the fifth proximity switch 85. Each fifth proximity switch 85 is used to monitor in real time whether the buckle locking mechanism locks the bucket cover 3 on the mixing barrel 2.
[0057] The signal lines of the second proximity switch 81, the travel switch 82, the third proximity switch 83, the fourth proximity switch 84, and the fifth proximity switch 85 are all connected to the control system. The control system can receive and process the signals fed back by the second proximity switch 81, the travel switch 82, the third proximity switch 83, the fourth proximity switch 84, and the fifth proximity switch 85 in real time. When the following five conditions from Condition 1 to Condition 5 are simultaneously met, the control system gives an instruction that the mixer is allowed to start, unlocks the start button of the mixer, and when the start button of the mixer is pressed, the mixer starts, that is, the variable-frequency motor 12 is unlocked; when any one or more of the following five conditions from Condition 1 to Condition 5 are not met, the control system gives an instruction that the mixer is not allowed to start, locks the start button of the mixer, and when the start button of the mixer is pressed, the mixer cannot start, that is, the variable-frequency motor 12 is locked;
[0058] Condition 1: The second proximity switch 81 senses the U-shaped safety inner support block 71; Condition 2: The connecting seat 33 presses on the contact of the travel switch 82 to trigger the travel switch 82; Condition 3: The third proximity switch 83 senses the positioning pin 35; Condition 4: The fourth proximity switch 84 senses the bearing seat 41; Condition 5: Each fifth proximity switch 85 senses the corresponding pin shaft 92.
[0059] With the above five-fold protection settings, the safety performance of the mixer is greatly improved.
[0060] The structure of the stirring device described in this embodiment is as follows: the vertically placed stirring shaft is hermetically supported in the through hole at the bottom of the stirring barrel through bearings and a sealing structure. The stirring shaft extending downward outside the stirring barrel 2 is driven to rotate by a driving device. A stirring paddle group is arranged on the stirring shaft located inside the stirring barrel 2. The stirring paddle group includes three stirring paddles 27 arranged from top to bottom. As Figure 9 shown, two paddle blades are arranged in each stirring paddle 27, and the two paddle blades in each stirring paddle 27 are rotationally symmetrically distributed. The paddle blades of two adjacent stirring paddles 27 up and down are staggered by 90° in the vertical position. The surface roughness of the paddle blades is controlled below Ra3.2.
[0061] The driving device includes: a variable-frequency motor 12 installed on the machine base 1. The motor shaft of the variable-frequency motor 12 extends into the machine base 1. The lower end of the stirring shaft extends into the machine base 1. The transmission that transmits the power on the motor shaft of the variable-frequency motor 12 to the stirring shaft is located inside the machine base 1. The transmission can adopt chain drive, belt drive, gear drive, etc. The transmission belongs to conventional technology. As Figure 9 and Figure 10 shown, in this embodiment, an induction disc 28 is fixedly installed on the stirring shaft at the machine base 1. An induction notch 281 is opened on the induction disc 28. A first proximity switch 13 is arranged on the machine base 1 at the position of the induction disc 28. The signal line of the first proximity switch 13 is connected to the control system. The signal line of the variable-frequency motor 12 is connected to the control system through a frequency converter. The control system is set with the set speeds corresponding to the stirring shaft at different stirring stages. Each time the induction disc 28 rotates one circle, the first proximity switch 13 senses once. The control system can receive the signal fed back by the first proximity switch 13 in real time and process it, and then compare and judge the data obtained after processing with the set speed corresponding to the stirring shaft at this stirring stage. When the rotation speed of the stirring shaft detected by the first proximity switch 13 is inconsistent with the set speed corresponding to the stirring shaft at this stirring stage, the control system issues an instruction to the frequency converter, and adjusts the rotation speed of the variable-frequency motor 12 through the frequency converter until the rotation speed of the stirring shaft detected by the first proximity switch 13 is consistent with the set speed corresponding to the stirring shaft at this stirring stage. At the same time, the control system can display the rotation speed of the variable-frequency motor 12 and the rotation speed of the stirring shaft in real time in the form of data on the display screen 11.
[0062] In addition, to extend the service life of the mixer, in this embodiment, a layer of tungsten carbide coating is sprayed on the surfaces of all components in the stirring barrel 2 that can contact the material, the inner barrel wall of the stirring barrel 2, the inner wall of the barrel cover 3, and the inner wall of the feeding port of the barrel cover 3, and the surface of the tungsten carbide coating is polished to make the surface roughness of the tungsten carbide coating less than 0.8 μm. The thickness of the polished tungsten carbide coating is 0.3 ± 0.05 mm. In addition to extending the life of the mixer, it also reduces the wear amount of the material, and ensures that the monitored powder resistance of the uniformly mixed material has an extreme value deviation ≤ 15%.
[0063] The mixing machine with the above structure can adapt to different material stirring speeds and temperature control process requirements, and can quickly and accurately control to reach the required mixing temperature and stirring speed under different feeding states, and is applicable to the mixing in the pretreatment stage of battery electrode materials.
[0064] The above is only a preferred embodiment of the present invention, and does not impose any other form of limitation on the present invention. Any modification or equivalent change made according to the technical essence of the present invention still belongs to the scope protected by the present invention.
Claims
1. An automatic temperature-controlled stirring and mixing machine, comprising: A machine base, a mixing barrel fixedly installed on the machine base, and a barrel cover hermetically locked on the top open mouth of the mixing barrel through a locking cover mechanism and a sealing device; A mixing device for mixing the materials in the mixing barrel is arranged at the bottom of the mixing barrel. A discharge port is formed on the side wall at the bottom end of the mixing barrel, and a discharging device is installed at the discharge port. It is characterized in that: the barrel wall of the mixing barrel is a double-layer structure with a hollow closed interlayer; several flow guiding plates are sequentially arranged at intervals from top to bottom in the hollow closed interlayer, and each flow guiding plate divides the hollow closed interlayer into several independent and closed flow channel cavities from top to bottom in sequence; a flow guiding port is formed on each flow guiding plate, and each flow guiding port can communicate the upper and lower two flow channel cavities separated by the flow guiding plate where the flow guiding port is located, and the flow guiding ports on two adjacent flow guiding plates are staggered up and down; a water inlet pipe and a water outlet pipe are arranged on the outer barrel wall of the mixing barrel, the water inlet pipe is communicated with the flow channel cavity at the lowest layer in the mixing barrel, and the water outlet pipe is communicated with the flow channel cavity at the uppermost layer in the mixing barrel; The structure of the mixing device is: a vertically placed mixing shaft is hermetically supported in a through hole at the bottom of the mixing barrel through a bearing and a sealing structure, the mixing shaft extending downward out of the mixing barrel is driven to rotate by a driving device, and a mixing paddle group is arranged on the mixing shaft in the mixing barrel; the mixing paddle group includes three mixing paddles arranged from top to bottom, two paddle blades are arranged in each mixing paddle, and the two paddle blades in each mixing paddle are rotationally symmetrically distributed; the paddle blades in two adjacent mixing paddles up and down are staggered 90° up and down; The driving device includes: a frequency conversion motor installed on the machine base, the motor shaft of the frequency conversion motor extends into the machine base, the lower end of the mixing shaft extends into the machine base, and the transmission for transmitting the power on the motor shaft of the frequency conversion motor to the mixing shaft is located in the machine base; an induction disc is fixedly installed on the mixing shaft at the machine base, an induction notch is formed on the induction disc, a first proximity switch is arranged on the machine base at the position of the induction disc, the signal wire of the first proximity switch is connected with the control system, and the signal wire of the frequency conversion motor is connected with the control system through a frequency converter.
2. The automatic temperature-controlled stirring and mixing machine according to claim 1, wherein: A first flow rate regulating control valve, a first flowmeter and a first water temperature control display instrument are installed on the water inlet pipe; a second flow rate regulating control valve, a second flowmeter and a second water temperature control display instrument are installed on the water outlet pipe; a radar level sensor for measuring the material level in the mixing barrel is arranged on the top of the barrel cover; a point-contact pressure gauge for measuring the pressure in the mixing barrel is arranged on the top of the barrel cover; a thermocouple for measuring the temperature of the materials in the mixing barrel is arranged on the barrel wall of the mixing barrel; The signal wires of the first flow rate regulating control valve, the second flow rate regulating control valve, the first flowmeter, the second flowmeter, the first water temperature control display instrument, the second water temperature control display instrument, the thermocouple, the radar level sensor and the point-contact pressure gauge are all connected with a control system with a display screen.
3. An automatic temperature-controlled stirring and mixing machine according to claim 1 or 2, characterized in that: The distance from the top surface to the bottom surface of each flow channel cavity is the same, and the upper and lower positions of the diversion openings on two adjacent baffle plates are staggered by 180°; the upper and lower positions of the diversion opening on the baffle plate at the lowest layer of the flow channel cavity and the position of the water inlet pipe are staggered by 180°; the upper and lower positions of the diversion opening on the baffle plate at the uppermost layer of the flow channel cavity and the position of the water outlet pipe are staggered by 180°, and the water outlet pipe is located directly above the water inlet pipe.
4. An automatic temperature-controlled stirring and mixing machine according to claim 1, characterized in that: A sewage discharge pipe communicating with the flow channel cavity at the lowest layer is provided on the bottom of the mixing barrel, and a sewage discharge valve is installed on the sewage discharge pipe.
5. An automatic temperature-controlled stirring and mixing machine according to claim 1, characterized in that: A layer of tungsten carbide coating is sprayed on the surfaces of all components in the mixing barrel that can contact the material, on the inner barrel wall of the mixing barrel, on the inner wall of the barrel cover, and on the inner wall of the feeding port of the barrel cover; The mixing barrel is composed of an inner barrel and an outer barrel to form a double-layer structure with a hollow closed interlayer. The inner barrel is made of stainless steel material, and the wall thickness of the inner barrel is 8 mm; the outer barrel is made of carbon steel material, and the wall thickness of the outer barrel is 6 mm; An observation port is provided on the barrel cover, and a tempered glass with a scraper and lighting is sealed on the observation port; a spare port is provided on the barrel cover, and the spare port also serves as a sampling port, and the spare port is blocked by a flange.
6. An automatic temperature-controlled stirring and mixing machine according to claim 1 or 2, characterized in that: The connection structure between the barrel cover and the mixing barrel is as follows: the cylinder block of the cylinder is fixed on the outer barrel wall of the mixing barrel, and the bearing seat is fixed on the top of the piston rod of the cylinder; a connecting seat with a connection hole is provided on the barrel cover, the bottom of the rotating shaft sequentially passes through the connection hole and the bushing and then extends into the bearing seat, and is fixedly connected with the inner ring of the bearing in the bearing seat. An external thread section is provided on the upper section of the rotating shaft. After the top of the rotating shaft extends above the connection hole, it passes through the gasket and is screwed with the locking nut; a positioning pin is provided on the connecting seat, and a positioning plate with a positioning hole is provided on the outer barrel wall of the mixing barrel. When the barrel cover is correctly covered on the mixing barrel, the positioning pin is inserted into the positioning hole; A storage rack is fixedly provided on the outer barrel wall of the mixing barrel, and a U-shaped safety support block is placed on the storage rack. After the cylinder drives the barrel cover to open upward, the U-shaped safety support block is clamped into the gap between the bearing seat and the cylinder. Before the barrel cover needs to be pulled down and covered on the mixing barrel, the U-shaped safety support block is taken out and put back on the storage rack again.
7. An automatic temperature-controlled stirring and mixing machine according to claim 6, characterized in that: A second proximity switch is installed on the outer barrel wall of the mixing barrel or on the storage rack. When the U-shaped safety support block is placed on the storage rack, it is located within the sensing area of the second proximity switch, and when the U-shaped safety support block is separated from the storage rack, it is located outside the sensing area of the second proximity switch; A travel switch is installed on the outer barrel wall of the mixing barrel. When the barrel cover is correctly covered on the mixing barrel, the connecting seat presses on the contact of the travel switch at the position where the travel switch is located; A third proximity switch is installed on the outer barrel wall of the mixing barrel. When the positioning pin inserted into the positioning hole is located within the sensing area of the third proximity switch at the position where the third proximity switch is located, and when the positioning pin is separated from the positioning hole upward, it is located outside the sensing area of the third proximity switch; A fourth proximity switch is installed on the outer barrel wall of the mixing barrel. When the barrel cover is covered on the mixing barrel, the bearing seat is located within the sensing area of the fourth proximity switch at the position where the fourth proximity switch is located, and when the barrel cover rises under the drive of the cylinder, the bearing seat is located outside the sensing area of the fourth proximity switch; The signal lines of the second proximity switch, the travel switch, the third proximity switch, and the fourth proximity switch are all connected to the control system.
8. An automatic temperature-controlled stirring and mixing machine according to claim 7, characterized in that: The lid locking mechanism is composed of several buckle locking mechanisms; the structure of each buckle locking mechanism is as follows: a locking block is fixedly arranged on the bucket lid, and a locking groove in the shape of a semi-circular channel is formed on the top surface of the locking block; an installation seat is fixedly arranged on the outer barrel wall of the mixing barrel below the locking block, the front end of the handle is hinged to the installation seat, threaded sections are respectively arranged at both ends of a rectangular buckle formed by bending a round rod, a pin shaft is movably inserted through a through hole in the handle and both ends of the pin shaft respectively extend out of the through hole in the handle, a connecting through hole is respectively formed at both ends of the pin shaft extending out of the through hole in the handle, the threaded sections at both ends of the rectangular buckle are respectively inserted through the corresponding connecting through holes and are respectively fixed to the pin shaft by two nuts; when the handle swings relative to the hinge point between the handle and the installation seat, the rectangular buckle can be clamped with the locking groove or the rectangular buckle can be disengaged from the locking groove; A fifth proximity switch is installed on the outer barrel wall of the mixing barrel at at least one buckle locking mechanism, and the position of each fifth proximity switch is such that when the rectangular buckle in the corresponding buckle locking mechanism is clamped with the locking groove, the position of the pin shaft is within the sensing area of the fifth proximity switch, and when the rectangular buckle is disengaged from the locking groove, the position of the pin shaft is outside the sensing area of the fifth proximity switch; the signal line of the fifth proximity switch is connected to the control system.