CN117912839A - Painting method and device for precise instrument wire winding coil - Google Patents

Abstract

The invention relates to a painting device for a precise instrument wire winding coil, which comprises a heat preservation protective cover, a cable, an electric cabinet, a paint brush, a motor, a rotary supporting mechanism, a motor heat shield, a moving coil supporting shaft, a mounting base and a heating pipe. The thermocouple measuring range is 0-280 deg.c, and the wire winding moving coil is installed on the moving coil supporting shaft. The natural width of the paint brush head is 1/2-2/3 of the width of the wire groove of the wire winding ring. The invention also relates to a painting method for the precise instrument wire winding coil, which comprises the processes of pre-baking, painting and baking, wherein the rotating speed of the motor is 5 revolutions per minute. According to the paint brushing device, the heat-insulating protective cover provides a stable temperature field for the wire winding ring; the motor heat shield, the heat insulation pad and the heat insulation shield are matched, and a high-price high-temperature-resistant motor is not required to be used. The painting method can provide a control mode of integrating pre-baking, painting and baking, and the heating pipe is continuously heated in the whole painting process, so that the painting process flow is simplified, and the efficiency is high.

Description

Painting method and device for precise instrument wire winding coil

Technical Field

The invention belongs to the technical field of paint brushing processes, and particularly relates to a paint brushing method and device for a precise instrument wire winding ring.

Background

The precise wire winding coil is widely applied to mechanical inertial instruments and is mainly used as a moving coil of torquers and sensors, wherein the circumferential wire winding coil is a moving coil structure most commonly used for pendulum accelerometers. As one of the most main structural units of inertial navigation, the accelerometer is an inertial instrument provided with a detection mass block with a constraint component, and the core component of the accelerometer is an inertial mass pendulum formed by installing two torquer coils at two ends of a flexible pendulum.

The accelerometer moving coil is generally formed by winding an enamelled wire with phi of 0.04 around an annular framework, as shown in figure 1, the framework has the advantages of 1.6-3 wire groove widths, 0.1 depth, 3.2 mounting center holes, smaller outer diameter than phi 10, 0.02 tolerance, and small size and small wire diameter, and the whole moving coil is formed by brushing insulating paint on the surface of the coil after winding for protection and fixation. Because the moving coil is a precision instrument level assembly part, the requirement on cleaning of redundant paint liquid and uniformity of the paint liquid is very high.

The painting process of the accelerometer moving coil comprises four parts of pre-baking, painting, baking paint, cleaning and cleaning.

Pre-baking before painting is beneficial to improving paint fluidity and impregnating effect of paint liquid and a matrix during painting, removing volatile matters in insulating materials and moisture brought into an insulating system, and is usually carried out by putting moving coils into an oven in batches for pre-baking. Because the moving coil has small structure size, the moving coil is taken out of the oven to be painted, and then the temperature is reduced to normal temperature, and the pre-baking effect before painting is poor.

The moving coil is small in size, the paint amount is small, paint liquid is not allowed to exist outside the framework winding groove, and a paint spraying process cannot be used. Because of the small wire diameter, the slender soft brush needs to be used for brushing paint, and a row brush with higher rigidity cannot be used. The moving coil mopping is traditional manual operation, adopts single moving coil dress card frock to compress tightly its both ends face, and handheld dipping paint soft brush is mopped along the circular motion at skeleton wire winding groove, and brush position, orbit are unstable, very easily brush outside the wire winding groove and permeate its terminal surface by skeleton edge breach, and paint liquid distributes unevenly, and the clearance degree of difficulty is big after the solidification, wastes time and energy.

The moving coil baking paint is placed in a baking oven in batches for baking paint, and the single-sided standing baking paint of the product is easy to be deposited locally or is incomplete. Because the moving coil is assembled at the two ends of the deflection pendulum of the pendulum piece, the uneven paint layer influences the quality uniformity and stability of the deflection inertial mass pendulum.

Disclosure of Invention

In order to overcome the defects of poor quality, time and labor waste in the process of brushing the wire winding coil, the invention provides a method and a device for brushing the wire winding coil of a precise instrument.

The technical scheme adopted for solving the technical problems is as follows:

A painting device for a precise instrument wire winding coil comprises a heat preservation protective cover, a cable, an electric cabinet, a painting device body and a paint brush.

The electric cabinet and the painting device body are communicated with the circuit through a cable, and the heat preservation protective cover is hollow hexahedron with an opening at the lower part and a part at one side and covers the painting device body. The paint brush is used for painting the precise instrument wire winding coil, and the electric cabinet is used for power supply and control of the painting device body.

The paint brushing device body comprises a motor, a rotary supporting mechanism, a motor heat shield, a moving coil supporting shaft, a mounting base, a coupler and a heating pipe. When in operation, the wire winding moving coil is arranged on the moving coil supporting shaft.

The rotary supporting mechanism, the moving coil supporting shaft and the heating pipe are arranged on the mounting base. The heat preservation protection casing can be placed at the installation base for thermal-insulated heat preservation. The heating pipe is arranged in parallel with the moving coil supporting shaft and heats the coil winding.

The motor is connected with the moving coil supporting shaft through the coupler and drives the moving coil supporting shaft to synchronously rotate. The motor and the coupler are positioned on the rotary supporting mechanism, and the motor heat shield is arranged on the outer side of the rotary supporting mechanism.

The motor heat shield is hollow hexahedron with an opening at the lower part and an opening at one side, the opening at the side faces the motor, and the rotary supporting mechanism is completely wrapped at one side except the motor installation side;

The motor heat shield is supported by a single-layer stainless steel plate, the thickness of the stainless steel plate is 0.3mm, a heat insulation layer is stuck to the inner side of the stainless steel plate, and the heat conductivity coefficient of the heat insulation layer is 0.012-0.024W/m/K;

The insulation layer may be an aerogel insulation layer;

the motor is positioned at the outer side of the heat-preservation protective cover.

The heating pipe is supported and installed on the upper side of the installation base through the heating pipe;

the opening part of one side of the heat preservation protective cover is matched with the edge of the opening part of the side face of the motor heat preservation protective cover and is used for positioning the heat preservation protective cover.

The motor and the heating pipe are respectively communicated with the electric cabinet power supply and control circuit.

The heating tube may be an eye-protecting heating tube.

The paint brushing device for the precise instrument wire winding coil can further comprise a microscope, wherein the magnification of the microscope is 10-16 times, and the microscope is used for observing the precise instrument wire winding coil.

The paint brushing device for the precise instrument wire winding ring comprises a paint brushing device body, wherein the paint brushing device body further comprises a motor heat insulation pad. The motor heat insulation pad is positioned between the motor and the coupler.

The paint brushing device for the precise instrument wire winding ring comprises a paint brushing device body and a base heat insulation pad. The base heat insulation pad is installed on the lower side of the installation base and supports the installation base.

The paint brushing device can be arranged on the table top of the working platform, and the base heat insulation pad is connected with the table top.

The base heat insulation pad, the motor heat insulation pad and the protection pad are non-adhesive paint heat insulation materials and can be polytetrafluoroethylene materials.

The paint brushing device for the precise instrument wire winding coil comprises a paint brushing device body and a thermocouple. The thermocouple is positioned on one side of the movable coil supporting shaft and is used for measuring the temperature of the surface of the wire-wound movable coil, and the measuring range is 0-280 ℃.

The thermocouple is installed on the upper side of the installation base through a thermocouple support.

The thermocouple is communicated with the electric cabinet temperature control circuit.

The paint brushing device for the precise instrument wire winding coil comprises a paint brushing device body, wherein the paint brushing device body further comprises a moving coil limiting nut. The moving coil limit nut is positioned at the free end of the moving coil supporting shaft, so that the wire winding moving coil is convenient to clamp and detach.

According to the paint brushing device for the precise instrument wire winding moving coil, the moving coil supporting shaft is made of high-speed steel materials.

The movable coil supporting shaft is supported by single-end double-point support, and is fixedly connected with the mounting base through the supporting seat.

The movable coil supporting shaft can be additionally provided with protection gaskets, and the protection gaskets are positioned at two ends of the plurality of wire winding movable coils and used for protecting the end faces of the wire winding movable coils or serving as process movable coils.

The electric cabinet comprises a control panel, a temperature control module, a power supply and a control module.

The power supply of the power supply and the control module is an adjustable direct current power supply, the voltage is 8V-13.5V, and direct current is provided for the motor and the heating pipe. The temperature control module is communicated with the thermocouple circuit, receives a temperature signal and controls the heating of the heating pipe.

According to the paint brushing device for the precise instrument wire winding coil, the heat-preservation protective cover is supported by the double-layer stainless steel plates, the thickness of the stainless steel plates is 0.3mm, the heat insulation layers are adhered between the stainless steel plates, and the heat conductivity coefficient of the heat insulation layers is 0.012-0.024W/m/K.

The insulation layer may be an aerogel insulation layer.

Polytetrafluoroethylene can be coated on the outer side surface of the heat-preservation protective cover, and the coating thickness is 0.5-1 mm. According to the paint brushing device for the precise instrument wire winding coil, the paint brush is a brush, and the natural width of the brush head is determined by the wire groove width of the wire winding coil.

The natural width of the brush head of the brush is 1/2-2/3 of the width of the wire groove of the wire winding coil, and the width of the wire groove of the wire winding coil is 1.6-3 mm.

A painting method for a precision instrument wire winding coil comprises the following steps:

step 1, pre-baking:

A group of precise instrument wire winding coils to be painted are arranged on a movable coil supporting shaft, protection gaskets are arranged at two ends of the whole group of wire winding coils, a movable coil limit nut is used for fastening the whole group of wire winding coils, and a heat-insulation protective cover is arranged on the outer cover of the painting device body.

Starting an electric cabinet, driving the whole group of wire winding coils to rotate by a motor, and heating a heating pipe, wherein the heating temperature is 150+/-1 ℃, and the heating time is 15-20 min.

Step 2, painting:

and taking down the heat preservation protective cover, and brushing paint by using a paint brush.

The paint brush head is arranged in the middle of the first wire winding coil groove and is inclined properly towards one side of the movable coil supporting shaft, which is not the heating pipe, the paint brush is not moved, and the wire winding coil rotates along the paint brush until paint uniformly spreads over the first wire winding coil groove.

And (5) brushing paint sequentially according to the arrangement sequence of the whole group of wire winding coils until the final wire winding coil is completely painted.

Step 3, baking paint:

after finishing the painting of the last wire winding ring, a heat-preservation protective cover is covered on the outer cover of the painting device body. And when the paint baking time is up, the electric cabinet cuts off the power supply of the motor and the heating pipe.

And taking out the whole set of wire winding coils after painting and drying.

Step 4, checking and cleaning:

And checking the surface quality of the wire-wound coil under a microscope according to the requirements of the painting quality.

And (3) cleaning excessive paint liquid on the surface of the coil until the coil is qualified.

In the method for brushing the precision instrument wire winding coil, in the step 1, the rotating speed of the motor is 5 revolutions per minute.

In the step 2 of painting, a microscope can be used for observing the painting process so as to improve the painting quality.

In the step 3 of baking paint, the baking paint time can be controlled to be 4 hours.

In the above-mentioned painting method for the precision instrument wire winding coil, in the step 3, baking may be also used for baking. The specific process is as follows:

after finishing the painting of the last wire winding ring, a heat preservation protective cover is covered on the outer cover of the painting device body, heat preservation is carried out for 1h, and the surface of the paint liquid is dried. And when the heat preservation time is up, the electric cabinet cuts off the power supply of the motor and the heating pipe. And taking out the whole group of wire winding coils, placing the whole group of wire winding coils in an oven, drying the paint liquid of the whole group of wire winding coils, and taking out the whole group of wire winding coils.

The beneficial effects of the invention are as follows:

A painting method for a precise instrument wire winding moving coil is characterized in that the moving coil can be conveniently and reliably assembled and disassembled in batches, painting and baking paint can be ensured to be uniformly distributed in a coil wiring groove in a low-speed rotation state, and a reasonable painting process is matched, so that a moving coil paint layer in a painting process is uniform, no residual paint liquid exists, cleaning and paint supplementing operations are not needed, and the problems of a single tool for assembling and assembling the pure manual painting, a large amount of residual paint liquid after baking the painting, high cleaning difficulty and uneven paint layer are solved. When in painting, an operator only needs to place the dip paint brush at a proper position, other actions are not needed, and the efficiency and quality of the painting operation of the moving coil are obviously improved.

A painting method for a precise instrument wire winding moving coil can provide a control mode of integration of pre-baking, painting and baking, a heating pipe is continuously heated in the whole painting process, and compared with ineffective pre-baking operation of clamping and painting after the preheated moving coil is taken out of an oven, ideal paint fluidity and impregnating effect can be obtained by effective heating during painting of the moving coil, the paint layer is uniformly distributed, the whole operation can be completed by clamping on a workbench at one time, and the painting process flow is fully simplified.

A mopping device for accurate instrument line winding moving coil, heat preservation protection casing provide stable temperature field for the moving coil with less consumption, and power is less than 40W when the temperature rises to not less than 200 ℃ in the cover after the installation, cooperates reasonable heating structure and temperature control algorithm, and single moving coil baking finish temperature control precision + -1 ℃. The motor heat shield, the heat insulation pad and the heat insulation shield are matched, the temperature of the motor is less than or equal to 50 ℃ in the whole baking finish stage, and an expensive high-temperature-resistant motor is not required.

A paint brushing device for a precise instrument wire winding coil, a power supply and a temperature control box can provide independent electrical control for 8 paths of paint brushing devices, the temperature range and the heat preservation time of each path of paint brushing device can be independently set, and the temperature and the time value are displayed in real time. The adjustable direct current power supply is provided for the direct current heating pipe and the direct current torque motor, the temperature rise rate, the temperature of the moving coil during painting, the motor rotating speed and the like can be conveniently adjusted according to requirements, and the equipment applicability is good.

The utility model provides a brushing device for accurate instrument line winding circle, simple structure is convenient for make, accords with instrument level unnecessary control requirement and firing equipment safe handling requirement, can directly be applied to the accurate instrument product mopping of similar structure or brush the operation of gluing, has fine commonality.

Drawings

FIG. 1 is a perspective view of an accelerometer moving coil;

FIG. 2 is a block diagram of a painting apparatus of the present invention;

FIG. 3 is a block diagram of the body and thermal shield of the painting apparatus of the present invention;

Fig. 4 is a schematic view of the overall connection of the painting device of the present invention.

In the figure: 1. a skeleton; 2. a coil; 3. a coil outgoing line; 4. edge notch; 5. a motor; 6. a rotary support mechanism; 7. a motor heat insulation pad; 8. a motor heat shield; 9. a moving coil supporting shaft; 10. a heating pipe and a support; 11. a thermocouple and a support; 12. thermal insulation protective cover; 13. a mounting base; 14. a socket; 15. a cable; 16. an electric control box; 17. a control panel; 18. a temperature control module; 19. a power supply and a control module; 20. a coupling; 21. a ball bearing; 22. the supporting seat; 23. a moving coil limit nut; 24. a heat insulating layer; 25. a base insulation pad; 26. heating pipes; 27. a heating pipe support; 28. a thermocouple; 29. thermocouple support; 30. a painting device body; 31. a protection gasket; 32. and a motor mounting surface of the supporting seat.

Detailed Description

Example 1

A painting device for a precise instrument wire winding coil mainly comprises a painting device body 30, a heat preservation protective cover 12, an electric cabinet 16 and a cable 15, as shown in fig. 4. The paint brushing device body 30 provides the functions of moving coil batch clamping, low-speed rotation, heating and temperature measurement, motor heat insulation and the like, the paint brushing device body 30 covers the heat insulation protective cover 12, the paint brushing device body 30 is connected with the electric cabinet 16 through the cable 15, and batch paint brushing and baking integrated operation of the moving coil is realized.

The upper limit of the outer circle of the moving coil of the painting device for clamping is phi 25, the application range of the moving coil for the accelerometer can be covered, other applications exceeding the application range can properly increase the rigidity of the moving coil supporting shaft 9 of the painting device body 30 and the rotating supporting mechanism 6 and the volume of the heat preservation protective cover 12 according to requirements, the painting device is suitable for the painting and baking operation of products with similar structures, and the electric cabinet 16 is general equipment of the painting device. The moving coil of the painting process is finished by using the painting device and the process, the paint layer in the coil groove is checked to be uniform under a microscope, the paint liquid is spread over the coil groove, and the residual paint liquid is not present at other parts.

A painting device for a precise instrument wire winding coil, a painting device body 30 (shown in fig. 2 and 3) comprises a motor 5, a motor heat insulation pad 7, a motor heat insulation cover 8, a moving coil supporting shaft 9, a moving coil limit nut 23, a heating pipe and support 10, a thermocouple and support 11, a rotary supporting mechanism 6, a socket 14, a mounting base 13 and a base heat insulation pad 25. A small low-speed torque motor 5 with the rotating speed of 5 revolutions per minute is selected and connected with a moving coil supporting shaft 9 through a coupler 20 to provide stable rotating speed for the motor. The rotary supporting mechanism 6 comprises a U-shaped supporting seat 22, a coupler 20, a ball bearing 21 and a fastening screw, and is used for providing positioning connection for the motor 5 and the moving coil supporting shaft 9, wherein the moving coil supporting shaft 9 adopts single-end double-point supporting, and a supporting part is provided by the coupler 20 and the ball bearing 21 which is embedded and matched with the U-shaped supporting seat 22; the non-supporting end is open, and the end is provided with a limit nut 23, so that convenient moving coil clamping, dismounting and good rotation stability can be provided. The moving coils are sequentially and continuously arranged on the moving coil supporting shaft 9, the moving coil limiting nuts 23 are used for locking to complete clamping, 15-24 moving coils (matched with various moving coil sizes) can be clamped at one time, and the protection gaskets 31 can be assembled at two ends of the moving coil supporting shaft 9 and used for protecting the end faces of the moving coils or serving as process moving coils when the number of the moving coils is insufficient. The protection pad 31 is commonly used with the motor insulation pad 7 where the motor 5 is mounted with screws. The support 22 is mounted and fixedly connected to the mounting base 13.

A direct current heating pipe 26 (eye protection heating pipe) which is convenient for temperature adjustment is arranged in parallel with the moving coil supporting shaft 9, the effective axial working size of the heating pipe 26 is consistent with that of the moving coil supporting shaft 9, and the position comprehensively considers the operation convenience, the reliability and the power consumption. A temperature control thermocouple 28 is mounted close to the temperature field of the moving coil support shaft 9. The heating pipe 26 and the thermocouple 28 are respectively and fixedly connected to the mounting base 13 by a heating pipe support 27 and a thermocouple support 29, and the mounting base 13 is supported by a base heat insulation pad 25. The motor heat insulation pad 7 and the base heat insulation pad 25 are made of polytetrafluoroethylene materials without paint adhesion, the moving coil supporting shaft 9 is made of high-speed steel materials which are not easy to deform, and other structural members can be made of stainless steel or aluminum alloy materials.

The motor heat shield 8 embedded with the aerogel heat insulation layer 24 is supported by a single-layer thin stainless steel plate (delta 0.3), the rotary supporting mechanism 6 in the heat preservation protective cover 12 is wrapped, installed and fixed, only the U-shaped supporting seat (22) of the rotary supporting mechanism 6 is exposed to the motor installation surface (32) of the supporting seat, the motor heat insulation pad 7 is matched, the moving coil is baked with paint for 4 hours at 150 ℃ after the heat preservation protective cover 12 is assembled, and the motor 5 is lower than 50 ℃. The socket 14 provides an electrical interface for the heating tube 26, thermocouple 28, motor 5.

A painting device for a precise instrument wire winding coil is provided, a heat-preservation protective cover 12 (see figure 3) is a rectangular cover with an open lower end and a grooved side surface (matched with the edge of the open end of a motor heat-insulation cover 8 at the outer side of a rotary supporting mechanism 6), is designed according to the requirements of a heating mechanism, a temperature field, heating efficiency, power consumption control and surplus control, and can be installed to the painting device to realize stable heating of the moving coil and heat insulation of a motor 5. The heat preservation protective cover 12 takes a cut and formed double-layer thin stainless steel plate (delta 0.3) as a support and is integrally welded, an aerogel heat insulation layer 24 (the heat conductivity coefficient is 0.012-0.024W/m/K) is stuck between the steel plates, and meanwhile, the volume of the heat preservation protective cover 12 is controlled, so that the temperature field around a moving coil can be increased from 55 ℃ in an open state to not lower than 200 ℃ in an installation state, and the power consumption of a heating pipe 26 is lower than 40W; the double-layer full-welded stainless steel heat-insulating protective cover 12 can ensure the cleanliness of the baking finish area. After the temperature in the heat preservation protective cover 12 is stable, the difference value of the temperature fields around the clamping moving coil group is within 5 ℃, the difference value of the temperature fields around the single moving coil is +/-1 ℃, and the stable temperature field can be provided for the moving coil baking finish by matching with the function of stable speed rotation. The temperature in the heat-insulating cover of the painting device is raised to 150 ℃ from normal temperature for 11-13 min. The stainless steel heat-insulating protective cover 12 can cover a polytetrafluoroethylene cover with the thickness of 1-2 mm to ensure the contact safety of bare hands.

A painting device for a precise instrument wire winding coil is provided, an electric cabinet 16 (see figures 2 and 4), a built-in power supply and control module 19 and a temperature control module 18 are arranged, and the electric element power supply and independent power-on control of the 8-path painting device can be provided. The heating pipe 26 and the motor 5 are all adjustable direct current power supplies (8V-13.5V), and the optimal voltage of each element is selected through experiments to obtain ideal heating rate, power consumption, paint brushing temperature when the heat preservation cover is opened, motor rotating speed and the like. The temperature control module 18 of the painting device controls the on-off of heating through the temperature measurement value of the thermocouple 28, can provide independent temperature control of 8 paths of heating pipes 26, can independently set the temperature range and the heat preservation time in each path of temperature control, and displays the temperature and time values in real time, wherein the temperature setting range is 0-280 ℃, the upper and lower limit difference value of the temperature, namely the temperature control step length, is set to be 0.1 ℃ at minimum, and the heat preservation time is set to be 10 s-999 h. The electric control box 16 realizes the automatic control of the on-off and temperature of the electric elements of each path of paint brushing device by a singlechip, and the control panel 17 sets related control parameters and displays parameter values in real time.

A painting method for a precise instrument wire winding coil is based on a painting process method of a painting device, and can directly finish the operations of pre-baking, painting and baking, and a paint layer is even without excessive paint liquid after baking, so that cleaning is not needed. The painting method based on the painting device comprises the following steps:

step 1, pre-baking

The moving coil spacing nut 6 of the moving coil painting device is unscrewed, the coil outgoing line 3 of the moving coil after winding penetrates into the inner cavity of the moving coil framework 1 from the edge notch 4 of the end face of the moving coil framework, then is sequentially clamped to the moving coil supporting shaft 9 and is fastened by the moving coil spacing nut 23, and the protection gaskets 31 are paid attention to the two ends of the whole group of moving coils. If the number of the moving coils is insufficient, a protection washer 31 may be used as a process moving coil to be mounted on the moving coil support shaft 9 to ensure the fastening effect of the moving coil limit nut 23. The heat-insulating shield 12 is covered outside the paint brush body 30.

Setting the heating temperature of the painting device to be 150+/-1 ℃, setting the heating time to be the sum of the pre-baking time and the paint baking time, wherein the pre-baking time is 15-20 min, the paint baking time is 4h, starting automatic timing after reaching the temperature, confirming that the heating pipe 26 starts to heat, and simultaneously starting to rotate the motor 5. After the preheating time is up, the heat-preserving protective cover 12 is taken down.

Step 2, brushing paint

Because the moving coil wire diameter is small and the paint amount is small, the paint dipping brush needs to be a small soft brush. According to the line width of the moving coil, an elongated soft brush with easily-shaped head and natural width of the brush head of 1/2-2/3 of the line width is selected, the brush head is arranged in the middle of the line groove during painting, the brush is not moving, the moving coil rotates at a low speed along the brush, and the moving coil is matched with effective baking paint and continuous heating, so that paint liquid flows smoothly, the track is stable, and the paint liquid uniformly spreads over the line groove. The manual positioning effect of the hairbrush can be better ensured by using the auxiliary operation of a microscope (10-16 times), and the effective length of the moving coil supporting shaft 9 is designed to be within the adjustable range of the microscope field of view. The brushing mode of brush positioning can accurately control the flowing track of the paint liquid, the paint liquid can not flow out of the coil groove, the moving coil can be continuously installed without end face isolation gaskets, and the clamping quantity can be increased by 50%.

Step 3, baking paint

After the moving coil is painted, the heat-insulating protective cover 12 is installed on the painting device body 30, and the surface of the paint liquid is dried after 1 h. According to the quantity requirement of batch products, the moving coil assembly can be disassembled and transposed in a standard oven until the whole paint liquid is dried, and the whole paint liquid can also be directly dried by using a paint brushing device. After the paint drying time is up, the heating pipe 26 and the motor 5 of the paint brushing device are automatically powered off.

Step 4, cleaning and checking

After the paint is dried, the moving coils are sequentially taken down from the moving coil supporting shaft 9, the surface of the moving coils is checked under a microscope, no redundant paint liquid exists, the paint layer is thin and uniform, no cleaning and paint supplementing operation is needed, and the quality uniformity and stability of the flexible assembly after the moving coils are mounted on the swinging sheet beam are improved. The paint brushing device and the paint brushing process meet the control requirement of the assembly surplus of the precise instrument.

Claims (10)

1. The paint brushing device for the precise instrument wire winding coil is characterized by comprising a heat preservation protective cover (12), a cable (15), an electric cabinet (16), a paint brushing device body (30) and a paint brush;

The electric cabinet (16) and the painting device body (30) are communicated with a circuit through a cable (15), and the heat-preservation protective cover (12) is in a hollow hexahedral shape with an opening at the lower part and covers the painting device body (30); the paint brush is used for painting the precise instrument wire winding coil, and the electric cabinet (16) is used for supplying and controlling electricity of the painting device body (30);

The paint brushing device body (30) comprises a motor (5), a rotary supporting mechanism (6), a motor heat shield (8), a moving coil supporting shaft (9), a mounting base (13), a coupler (20) and a heating pipe (26); when in work, the wire winding moving coil is arranged on the moving coil supporting shaft (9);

The rotary supporting mechanism (6), the moving coil supporting shaft (9) and the heating pipe (26) are arranged on the mounting base (13); the heat-insulating protective cover (12) can be placed on the mounting base (13) and is used for heat insulation; the heating pipe (26) is arranged in parallel with the moving coil supporting shaft (9) and is used for heating the coil winding;

The motor (5) is connected with the moving coil supporting shaft (9) through a coupler (20) to drive the moving coil supporting shaft (9) and the wire winding moving coil to synchronously rotate; the motor (5) and the coupler (20) are positioned on the rotary supporting mechanism (6), and a motor heat shield (8) is arranged outside the rotary supporting mechanism (6);

The motor (5) is positioned at the outer side of the heat-preservation protective cover (12);

the motor (5) and the heating pipe (26) are respectively communicated with the power supply and control circuit of the electric cabinet (16).

2. The paint device for a precision meter wire-wound coil as claimed in claim 1, further comprising a microscope having a magnification of 10 to 16 times for observing the coil of the wire-wound coil.

3. The device for painting a precision meter wire winding according to claim 1 or 2, characterized in that the body (30) of the painting device further comprises a motor insulation pad (7); the motor heat insulation pad (7) is positioned between the motor (5) and the coupler (20);

The paint brushing device body (30) further comprises a base heat insulation pad (25); the base heat insulation pad (25) is arranged on the lower side of the mounting base (13) and supports the mounting base (13);

the paint brushing device can be arranged on the table top of the working platform, and the base heat insulation pad (25) is connected with the table top.

4. A painting device for a precision meter wire winding coil according to claim 3, characterized in that the base heat insulation pad (25), the motor heat insulation pad (7) and the protection pad (31) are non-stick paint heat insulation materials, which can be polytetrafluoroethylene materials.

5. The device for painting a precision meter wire winding according to claim 1 or 2, characterized in that the body (30) of the painting device further comprises a thermocouple (28); the thermocouple (28) is positioned at one side of the movable coil supporting shaft (9) and is used for measuring the temperature of the surface of the wire-wound movable coil, and the measuring range is 0-280 ℃;

the thermocouple (28) is arranged on the upper side of the mounting base (13) through a thermocouple support (29);

The thermocouple (27) is communicated with a temperature control circuit of the electric cabinet (16).

6. The painting device for precision instrument wire windings according to claim 1 or 2, characterized in that the painting device body (30) further comprises a moving coil limit nut (23); the moving coil limiting nut (23) is positioned at the free end of the moving coil supporting shaft (9) and is convenient for clamping and dismounting the wire winding moving coil.

7. The painting device for precision instrument wire winding coils according to claim 1, characterized in that the moving coil supporting shaft (9) is of high-speed steel material;

The movable coil supporting shaft (9) adopts single-end double-point supporting, and the movable coil supporting shaft (9) is fixedly connected with the mounting base (13) through the supporting seat (22);

the movable coil supporting shaft (9) can be additionally provided with protection gaskets (31), and the protection gaskets (31) are positioned at two ends of the plurality of wire winding coils and used for protecting the end surfaces of the wire winding coils or serving as process movable coils.

8. The device for brushing the precision meter wire winding according to claim 1, characterized in that the electric control box (16) comprises a control panel (17), a temperature control module (18), a power supply and control module (19);

The power supply of the power supply and control module (19) is an adjustable direct current power supply, the voltage is 8V-13.5V, and direct current is provided for the motor (5) and the heating pipe (26); the temperature control module (18) is in circuit communication with the thermocouple (28), receives a temperature signal and controls the heating of the heating pipe (26);

The heat-insulating protective cover (12) is supported by double-layer stainless steel plates, the thickness of the stainless steel plates is 0.3mm, heat-insulating layers (24) are adhered between the stainless steel plates, and the heat conductivity coefficient of the heat-insulating layers is 0.012-0.024W/m/K;

the insulation layer (24) may be an aerogel insulation layer;

The outer side surface of the heat preservation protective cover (12) can be coated with polytetrafluoroethylene, and the thickness of the coating layer is 0.5-1 mm.

9. A painting method for a precision meter wire winding coil, using the painting device for a precision meter wire winding coil according to any one of claims 1 to 8, characterized by comprising the steps of:

step 1, pre-baking:

A group of wire winding coils to be painted are arranged on a movable coil supporting shaft (9), protection gaskets (31) are arranged at two ends of the whole group of wire winding coils, a movable coil limiting nut (23) is used for fastening the whole group of wire winding coils, and a heat-insulation protective cover (12) is arranged on an outer cover of a painting device body (30);

starting an electric cabinet (16), driving the whole group of wire winding coils to rotate by a motor (5), and starting heating the heating pipe (26);

step 2, painting:

Removing the heat-insulating protective cover (12) and brushing paint by using a paint brush;

The paint brush head is arranged in the middle of the first wire-wound coil groove and is inclined towards one side of the movable coil supporting shaft (9) which is not the heating pipe, the paint brush is not moved, and the wire-wound coil rotates along the paint brush until the paint uniformly spreads over the first wire-wound coil groove; sequentially brushing paint according to the arrangement sequence of the whole group of wire winding coils until the last wire winding coil is completely coated;

step 3, baking paint:

After finishing the painting of the last wire winding ring, a heat-insulating protective cover (12) is covered on the outer cover of the painting device body (30); when the paint baking time is up, the electric cabinet (16) cuts off the power supply of the motor (5) and the heating pipe (26);

and taking out the whole set of wire winding coils after painting and drying.

10. The method of brushing a precision meter wire winding as set forth in claim 9, further comprising the step of 4, inspecting and cleaning:

Checking the surface quality of the wire-wound coil under a microscope according to the requirements of the painting quality;

The superfluous paint liquid on the surface of the coil can be cleaned until the coil is qualified;

In the pre-baking in the step 1, the rotating speed of the motor (5) is 5 revolutions per minute;

in the step 2 of painting, a microscope can be used for observing the position of the painting brush so as to improve the painting quality;

in the step 3 of baking paint, the baking paint time can be controlled to be 4 hours;

In the step 3, baking paint can be further dried by adopting an oven; the specific process is as follows:

After finishing the painting of the last wire winding ring, a heat preservation protective cover (12) is covered on the outer cover of the painting device body (30), heat preservation is carried out for 1h, and the surface of the paint liquid is dried; when the heat preservation time is up, the electric cabinet (16) cuts off the power supply of the motor (5) and the heating pipe (26); and taking out the whole group of wire winding coils, placing the whole group of wire winding coils in an oven, drying the paint liquid of the whole group of wire winding coils, and taking out the whole group of wire winding coils.