Viscosity testing equipment for insulating paint

Abstract

The utility model discloses viscosity testing equipment for insulating paint, and belongs to the technical field of viscosity testing of insulating paint. Viscosity testing equipment for insulating paint comprises a fixed seat, a controller arranged on the outer wall of the front of the fixed seat, a servo motor arranged at the bottom of an inner cavity of the fixed seat, a plurality of electric push rod output ends connected with a temperature sensor, a digital viscometer sleeved on the outer wall of the circumference of a stand column, and a heating assembly and a cooling assembly arranged on the outer wall of the circumference of the fixed seat, the device can effectively cope with the diversity of test environments, can better ensure the temperature stability of the insulating paint in the test process, reduces the temperature deviation influence and the detection accuracy, can start the ultrasonic vibration function when heating or cooling the insulating paint, promotes the interior of the insulating paint to be efficiently mixed, and improves the test efficiency. The mixing effect can effectively reduce non-uniform phenomena of settlement, layering and the like of the insulating paint, and can further improve the accuracy and the test efficiency of the insulating paint test.

Description

Technical Field

[0001] This utility model relates to the field of insulating varnish viscosity testing technology, and more specifically, to a viscosity testing device for insulating varnish. Background Technology

[0002] Insulating varnish is a coating with excellent electrical insulation properties. It forms a tough film on the surface of an object, providing electrical insulation, moisture protection, mildew prevention, and corrosion protection. It is typically composed of a varnish base, solvent, fillers, and additives, and is widely used in motors, transformers, electronic equipment, and other fields.

[0003] Viscosity testing equipment for insulating varnish is an instrument used to measure the viscosity of insulating varnish. Viscosity is one of the important characteristics of insulating varnish, as it affects the coating performance, flowability, and physical properties after curing. Common insulating varnish viscosity testing equipment includes rotational viscometers. The principle is usually that a motor drives a rotor to rotate at a constant angular velocity in the fluid being tested, such as insulating varnish. The rotor is subjected to the viscous resistance of the fluid, which causes the torsion spring connected to the rotor to twist. The torsion angle of the torsion spring is proportional to the viscosity of the fluid. The instrument measures the torsion angle of the torsion spring and, based on the corresponding calculation formula, finally obtains the viscosity value of the fluid.

[0004] In the viscosity testing of insulating varnish, existing viscosity testing equipment typically requires placing the varnish in a test cup before measuring its viscosity. However, in practical applications, the viscosity of insulating varnish varies significantly with temperature changes. As a polymer-based material, the intermolecular interactions of insulating varnish are greatly affected by temperature. When the temperature rises, molecular thermal motion intensifies, intermolecular forces weaken, the fluidity of the insulating varnish increases, and the viscosity decreases; conversely, when the temperature decreases, molecular thermal motion slows down, intermolecular forces strengthen, and the viscosity increases. This viscosity fluctuation caused by temperature changes presents numerous challenges to conducting stable viscosity tests under various environments. On the one hand, for testing equipment, it is difficult to provide accurate and stable test results for the complex viscosity changes of insulating varnish at different temperatures. For example, the common rotating cup tester is affected by temperature changes, and the viscosity value determined based on a fixed rotation speed and flow conditions has an increased error. On the other hand, in actual production and application scenarios, such as electrical equipment manufacturing workshops, the temperature inside the workshop varies in different seasons or in areas with large day-night temperature differences. If the insulating varnish is prepared for production based on the viscosity test results at a standard temperature, it may lead to unstable insulation performance of electrical equipment, leakage risk, reduced equipment lifespan, or even equipment failure.

[0005] Moreover, existing insulating varnishes are usually complex systems composed of multiple components such as resins, solvents, fillers, and various additives. During storage, due to the different densities of the components, substances such as fillers with higher density tend to settle, while substances such as solvents with lower density tend to float, resulting in stratification. If tested directly, the viscosity data obtained only reflects the viscosity in a local and uneven state, and cannot represent the true average viscosity of the entire batch of insulating varnish. This brings great errors to the accuracy of the test.

[0006] In view of this, we propose a viscosity testing device for insulating varnish. Utility Model Content

[0007] The purpose of this invention is to provide a viscosity testing device for insulating varnish to solve the problems mentioned in the background art.

[0008] A viscosity testing device for insulating varnish includes a fixed base. A controller is mounted on the outer wall of the front of the fixed base. A servo motor is mounted at the bottom of the inner cavity of the fixed base. A fixed circular plate is connected to the output end of the servo motor. A connecting frame is welded to the outer circumference of the fixed circular plate. Connecting cylinders are respectively connected to the ends of multiple connecting frames. A temperature controller and an ultrasonic generator are also mounted on the outer wall of the fixed base. A support frame is also mounted on the outer wall of the fixed base. Electric push rods are connected to the top of multiple support frames. Temperature sensors are connected to the output ends of multiple electric push rods. A column is also connected to the top of the fixed base. A digital viscometer is sleeved on the outer circumference of the column. A heating component and a cooling component are mounted on the outer circumference of the fixed base. The heating component and the cooling component each include a first fixed shell and a second fixed shell, both of which extend into the interior of the fixed base.

[0009] Preferably, a sliding plate is slidably connected inside the plurality of connecting frames, and a spring is connected to the outer wall of the sliding plate, with the end of the spring connected to the inner wall of the connecting frame.

[0010] Preferably, the plurality of temperature sensors are electrically connected to the temperature controller, the temperature controller and the controller are electrically connected, and the plurality of electric push rods and servo motors are electrically connected to the controller.

[0011] Preferably, a connecting cover is fixedly connected to the outer wall of the fixed shell by screws, a fan is provided on the outer wall of the connecting cover, an electric heating grid is fixedly connected to the inner wall of the fixed shell, a through opening is provided on the top of the fixed shell, and an ultrasonic vibrator is also provided on the top of the fixed shell.

[0012] Preferably, the outer wall of the second fixed shell is fixedly connected to the second connecting cover by screws, the outer wall of the second connecting cover is provided with the second fan, the outer wall of the second fixed shell is provided with the second semiconductor cooling plate, the outer wall of the second semiconductor cooling plate is provided with the heat sink, the outer wall of the second fixed shell is also provided with the second tilting seat, the top of the tilting seat is provided with the cooling fan, the top of the second fixed shell has the second through opening, the top of the second fixed shell is also provided with the second ultrasonic vibrator, and both the first ultrasonic vibrator and the second ultrasonic vibrator are electrically connected to the ultrasonic generator.

[0013] Preferably, the first fan, the second fan, and the cooling fan are electrically connected to the controller, and the electric heating network and the semiconductor cooling plate are electrically connected to the temperature controller.

[0014] Preferably, the connecting cylinder has an air outlet at the top and the top of the connecting cylinder, a paint storage cylinder is sleeved inside the connecting cylinder, a retainer is provided at the bottom of the paint storage cylinder, and a retaining slot matching the retainer is provided at the bottom of the inner cavity of the connecting cylinder.

[0015] Compared to existing technologies, the advantages of this invention are as follows: When testing the insulating varnish, the sliding plate can be pulled back first, and then the varnish-carrying reservoir can be inserted into the connecting cylinder on the far right. The sliding plate is then released, limiting the top of the reservoir. The rotation direction of the servo motor can then be controlled according to the ambient temperature. When the ambient temperature is too low, the temperature of the insulating varnish in the reservoir is low. In this case, the controller can drive the servo motor to rotate clockwise to below a temperature sensor on one side. Then, the electric push rod drives the temperature sensor to insert into the insulating varnish. Finally, the fan and heating network are started, and the fan transfers the temperature of the heating network through multiple through-holes via airflow. The heat is blown into the connecting cylinder, which in turn heats the varnish reservoir. When the temperature is suitable, the electric push rod can be controlled to raise the temperature sensor, which then rotates clockwise to facilitate viscosity testing by the digital viscometer. Conversely, when the ambient temperature is high, the servo motor can be controlled by the controller to rotate counterclockwise to the bottom of another temperature controller, and then it descends and inserts into the insulating varnish. The semiconductor cooling plate can be activated, and the fan can blow cold air into the connecting cylinder to cool the insulating varnish. After reaching the appropriate temperature, it moves to the bottom of the digital viscometer in the same way for viscosity testing. This effectively addresses the diversity of testing environments, ensuring the temperature stability of the insulating varnish during testing, reducing the impact of temperature deviation, and improving the accuracy of the test.

[0016] Secondly, when heating or cooling the insulating varnish, the device can also activate the ultrasonic vibration function. When ultrasonic vibration is activated, the ultrasonic generator emits high-frequency vibration waves that act on the bottom of the varnish reservoir, promoting efficient mixing inside the insulating varnish. This mixing effect can effectively reduce uneven phenomena such as sedimentation and stratification of the insulating varnish. Furthermore, during the vibration mixing process, the movement of insulating varnish molecules intensifies, and heat or cold can be transferred more quickly and evenly, making the heating or cooling process more efficient. This method of temperature treatment combined with vibration mixing can further improve the accuracy and efficiency of insulating varnish testing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of structure A of the present invention;

[0019] Figure 3 This is a schematic diagram of the heating component structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the cooling component structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the connecting cylinder structure of this utility model;

[0022] Explanation of the labels in the diagram: 100, mounting base; 110, controller; 120. Servo motor; 130. Fixed circular plate; 140. Connecting frame; 141. Sliding plate; 142. Spring; 150. Support frame; 151. Electric push rod; 152. Temperature sensor; 160. Temperature controller; 170. Ultrasonic generator; 180. Column; 190. Digital viscometer; 200. Fixed shell one; 210. Connecting cover one; 220. Fan one; 230. Electric heating network; 240. Through port one; 250. Ultrasonic vibrator one; 300. Fixed shell two; 310. Connecting cover two; 320. Fan two; 330. Semiconductor cooling plate; 340. Heat sink; 350. Inclined seat; 351. Cooling fan; 360. Through port two; 370. Ultrasonic vibrator two; 400. Connecting cylinder; 410. Air outlet; 420. Paint storage cylinder; 430. Card seat. Detailed Implementation

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Please see Figure 1-5 This utility model provides a technical solution:

[0027] A viscosity testing device for insulating varnish includes a fixed base 100, a controller 110 is provided on the outer wall of the front of the fixed base 100, a servo motor 120 is provided at the bottom of the inner cavity of the fixed base 100, and a fixed circular plate 130 is connected to the output end of the servo motor 120.

[0028] In some embodiments: the servo motor 120 is existing technology and can be a common model available on the market, such as the Siemens 1FT7 series servo motor. The controller 110 controls the operation of the servo motor 120 by sending specific electrical signals. It has a pre-programmed precise control program. When it receives an instruction to move the paint reservoir 420 to a designated position, the controller 110 calculates the required rotation angle and direction of the servo motor 120 based on the target position information. For forward or reverse rotation, the controller 110 outputs the corresponding positive or negative phase electrical signal to the driver of the servo motor 120. The driver changes the current direction according to the signal, thereby driving the motor to rotate in the required direction. The equal-division rotation function is achieved by the controller 110 using its own pulse generator to send pulse signals of a fixed frequency and number to the servo motor 120. Each time the servo motor 120 receives a pulse, it rotates by a fixed angle, i.e., equal division of the angle. In this way, by precisely controlling the number of pulses, it can be ensured that the servo motor 120 drives the paint reservoir 420. The device can be accurately moved below the temperature sensor 152 for temperature detection and control; or moved to the bottom of the digital viscometer 190 to conduct viscosity testing of the insulating varnish. Both of these are existing technologies.

[0029] A connecting frame 140 is welded to the outer circumference of the fixed circular plate 130. The ends of multiple connecting frames 140 are respectively connected to connecting cylinders 400. A temperature controller 160 and an ultrasonic generator 170 are also provided on the outer wall of the fixed base 100.

[0030] In some embodiments: the temperature controller 160 typically consists of a control circuit and an actuator, facilitating temperature control of the insulating varnish in conjunction with the temperature sensor 152. The temperature sensor 152 is existing technology, and commonly available models can be selected. The ultrasonic generator 170 and the ultrasonic vibrator are essentially closely related and are often considered as a single unit. The ultrasonic generator 170 mainly includes components such as a signal generator and a power amplifier. The signal generator can generate an electrical signal of a specific frequency (generally above 20kHz). The frequency of this electrical signal determines the final output ultrasonic frequency. Since the initial electrical signal power is weak and insufficient to drive the efficient generation of ultrasonic waves, it is necessary to... The signal is amplified by a power amplifier to enhance its driving capability. The key component of the ultrasonic vibrator 170 is the ultrasonic vibrator. When the amplified electrical signal is input to the ultrasonic vibrator, the ultrasonic vibrator utilizes the inverse piezoelectric effect, that is, the characteristic of piezoelectric materials to undergo mechanical deformation under the action of an electric field. Because the input is a high-frequency electrical signal, the piezoelectric material will vibrate rapidly and at a high frequency, thereby converting the electrical signal into mechanical vibration waves of the same frequency, that is, ultrasound. These ultrasound waves can propagate into the insulating varnish, and through high-frequency vibration, they cause the molecules inside the insulating varnish to move violently, effectively breaking the sedimentation and stratification phenomena, achieving mixing homogenization, and improving the accuracy of the viscosity test of the insulating varnish. All of the above belong to the existing technology.

[0031] The outer wall of the fixed base 100 is also provided with a support frame 150, and multiple support frames 150 are connected to the top of electric push rods 151. The output end of multiple electric push rods 151 is connected to a temperature sensor 152.

[0032] In some embodiments: the electric actuator 151 is prior art, and a commonly available model can be selected.

[0033] The top of the fixed base 100 is also connected to a column 180. A digital viscometer 190 is sleeved on the outer circumference of the column 180. A heating component and a cooling component are provided on the outer circumference of the fixed base 100. The heating component and the cooling component include a first fixed shell 200 and a second fixed shell 300, respectively. Both the first fixed shell 200 and the second fixed shell 300 extend into the interior of the fixed base 100.

[0034] Specifically, multiple connecting frames 140 are internally slidably connected to sliding plates 141, and springs 142 are connected to the outer wall of sliding plates 141. The ends of springs 142 are connected to the inner wall of connecting frames 140, which facilitates limiting the top of the paint storage cylinder 420.

[0035] Furthermore, multiple temperature sensors 152 are electrically connected to temperature controller 160, temperature controller 160 is electrically connected to controller 110, and multiple electric push rods 151 and servo motor 120 are electrically connected to controller 110.

[0036] In some embodiments, the controller 110 is a PLC controller, which can control the electric push rod 151 to rise after temperature detection, and drive the servo motor 120 to rotate to the bottom of the digital viscometer 190 for viscosity detection.

[0037] Furthermore, a connecting cover 210 is fixedly connected to the outer wall of the fixed shell 200 by screws. A fan 220 is installed on the outer wall of the connecting cover 210. An electric heating grid 230 is fixedly connected to the inner wall of the fixed shell 200. A through opening 240 is opened at the top of the fixed shell 200. An ultrasonic vibrator 250 is also installed at the top of the fixed shell 200.

[0038] In some embodiments, the electric heating network 230 is existing technology and needs no further explanation.

[0039] Furthermore, the outer wall of the second fixed housing 300 is fixedly connected to the second connecting cover 310 by screws. The outer wall of the second connecting cover 310 is equipped with the second fan 320. The outer wall of the second fixed housing 300 is equipped with the semiconductor cooling plate 330. The outer wall of the semiconductor cooling plate 330 is equipped with the heat sink 340. The outer wall of the second fixed housing 300 is also equipped with the tilting seat 350. The top of the tilting seat 350 is equipped with the cooling fan 351. The top of the second fixed housing 300 has a through opening 360. The top of the second fixed housing 300 is also equipped with the second ultrasonic vibrator 370. Both the first ultrasonic vibrator 250 and the second ultrasonic vibrator 370 are electrically connected to the ultrasonic generator 170.

[0040] In some embodiments, the semiconductor cooling plate 330 is composed of N-type semiconductors and P-type semiconductors, which are connected by electrodes to form an electrical couple. Ceramic sheets are then attached to both sides. When direct current passes through, electrons and holes move directionally in different semiconductors. In the N-type semiconductor, electrons move from the low-temperature end to the high-temperature end, and in the P-type semiconductor, holes move from the high-temperature end to the low-temperature end. During this process, heat is absorbed on the low-temperature side and released on the high-temperature side, achieving the effects of cooling and heating. It can precisely control the temperature of the insulating varnish and create a suitable environment for viscosity testing. The heating end can be cooled by multiple heat sinks 340 and a cooling fan 351.

[0041] It is worth noting that fan 1 220, fan 2 320 and cooling fan 351 are electrically connected to controller 110, and electric heating network 230 and semiconductor cooling plate 330 are electrically connected to temperature controller 160.

[0042] It is worth noting that the connecting cylinder 400 has an air outlet 410 at the top and the top opening, a paint storage cylinder 420 is sleeved inside the connecting cylinder 400, a retainer 430 is provided at the bottom of the paint storage cylinder 420, and a retainer that matches the retainer 430 is provided at the bottom of the inner cavity of the connecting cylinder 400.

[0043] In some embodiments, multiple air outlets 410 correspond to the through-holes 240 and 360 on the top of multiple fixed shells 200 and connecting shells 300, respectively, and the cavities inside the fixed shells 200 and connecting shells 300 communicate with the through-holes 240 and 360, respectively.

[0044] In some embodiments, the device can be powered by an external power source, and the digital viscometer 190 can be selected from NDJ-5S / 8S / 9S, all of which are existing technologies.

[0045] In addition, the circuits, electronic components and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the internal structure and method.

[0046] Working Principle: When testing the insulating varnish, first pull the sliding plate backward, then insert the varnish-carrying reservoir into the rightmost connecting cylinder. Next, release the sliding plate, which limits the top of the reservoir. Then, control the rotation direction of the servo motor according to the ambient temperature. When the ambient temperature is too low, the insulating varnish inside the reservoir is often at a low temperature. In this case, the controller can control the servo motor to rotate clockwise to below the temperature sensor on one side. Then, the electric push rod will drive the temperature sensor to insert into the insulating varnish. Next, start the fan and heating grid. The fan will use airflow to blow the heat from the heating grid into the connecting cylinder through multiple through-holes. When the varnish reservoir is heated to a suitable temperature, the electric push rod can be controlled to raise the temperature sensor, which then rotates clockwise to the digital viscometer for viscosity testing. Conversely, when the ambient temperature is high, the servo motor can be controlled to rotate counterclockwise to the position below another temperature controller. The reservoir then descends and inserts into the insulating varnish. By activating the semiconductor cooling plate and using a second fan to blow cold air into the connecting cylinder, the insulating varnish is cooled. Once the appropriate temperature is reached, the reservoir is moved to the digital viscometer in the same manner for viscosity testing. This effectively addresses the diversity of testing environments, ensuring the temperature stability of the insulating varnish during testing, reducing the impact of temperature deviations, and improving the accuracy of the test.

[0047] Secondly, when heating or cooling the insulating varnish, the device can also activate the ultrasonic vibration function. When ultrasonic vibration is activated, the ultrasonic generator 170 emits high-frequency vibration waves, which, together with the designated ultrasonic vibrator 250 or ultrasonic vibrator 370, act on the bottom of the varnish reservoir 420, promoting efficient mixing inside the insulating varnish. This mixing effect can effectively reduce uneven phenomena such as sedimentation and stratification of the insulating varnish. Furthermore, during the vibration mixing process, the movement of insulating varnish molecules intensifies, and heat or cold can be transferred more quickly and evenly, making the heating or cooling process more efficient and further improving the accuracy and efficiency of the insulating varnish test.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A viscosity testing device for insulating varnish, comprising a fixed base (100), characterized in that: A controller (110) is provided on the outer wall of the front of the fixed base (100). A servo motor (120) is provided at the bottom of the inner cavity of the fixed base (100). The output end of the servo motor (120) is connected to a fixed circular plate (130). A connecting frame (140) is welded to the outer circumference of the fixed circular plate (130). A connecting cylinder (400) is connected to the end of each of the multiple connecting frames (140). A temperature controller (160) and an ultrasonic generator (170) are also provided on the outer wall of the fixed base (100). A support frame (150) is also provided on the outer wall of the fixed base (100). An electric push rod (151) is connected to the top of each of the multiple support frames (150). (151) A temperature sensor (152) is connected to the output end. A column (180) is also connected to the top of the fixed base (100). A digital viscometer (190) is sleeved on the outer circumference of the column (180). A heating component and a cooling component are provided on the outer circumference of the fixed base (100). The heating component and the cooling component include a first fixed shell (200) and a second fixed shell (300) respectively. Both the first fixed shell (200) and the second fixed shell (300) extend into the interior of the fixed base (100).

2. The viscosity testing device for insulating varnish according to claim 1, characterized in that: A sliding plate (141) is slidably connected inside the multiple connecting frames (140), and a spring (142) is connected to the outer wall of the sliding plate (141), with the end of the spring (142) connected to the inner wall of the connecting frame (140).

3. The viscosity testing device for insulating varnish according to claim 2, characterized in that: Multiple temperature sensors (152) are electrically connected to the temperature controller (160), the temperature controller (160) and the controller (110) are electrically connected, and multiple electric push rods (151) and servo motors (120) are electrically connected to the controller (110).

4. The viscosity testing device for insulating varnish according to claim 3, characterized in that: The outer wall of the fixed shell (200) is fixedly connected to the connecting cover (210) by screws. The outer wall of the connecting cover (210) is provided with a fan (220). The inner wall of the fixed shell (200) is fixedly connected with an electric heating grid (230). The top of the fixed shell (200) is provided with a through opening (240). The top of the fixed shell (200) is also provided with an ultrasonic vibrator (250).

5. The viscosity testing device for insulating varnish according to claim 4, characterized in that: The outer wall of the fixed shell 2 (300) is fixedly connected to the connecting cover 2 (310) by screws. The outer wall of the connecting cover 2 (310) is provided with a fan 2 (320). The outer wall of the fixed shell 2 (300) is provided with a semiconductor cooling plate (330). The outer wall of the semiconductor cooling plate (330) is provided with a heat sink (340). The outer wall of the fixed shell 2 (300) is also provided with an inclined seat (350). The top of the inclined seat (350) is provided with a cooling fan (351). The top of the fixed shell 2 (300) is provided with a through opening 2 (360). The top of the fixed shell 2 (300) is also provided with an ultrasonic vibrator 2 (370). The ultrasonic vibrator 1 (250) and the ultrasonic vibrator 2 (370) are both electrically connected to the ultrasonic generator (170).

6. The viscosity testing device for insulating varnish according to claim 5, characterized in that: The first fan (220), the second fan (320), and the cooling fan (351) are electrically connected to the controller (110), and the electric heating network (230) and the semiconductor cooling plate (330) are electrically connected to the temperature controller (160).

7. The viscosity testing device for insulating varnish according to claim 6, characterized in that: The connecting cylinder (400) has an air outlet (410) at the top and top. A paint storage cylinder (420) is sleeved inside the connecting cylinder (400). A retainer (430) is provided at the bottom of the paint storage cylinder (420). A slot matching the retainer (430) is provided at the bottom of the inner cavity of the connecting cylinder (400).

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