Coating brushing machine for small sand core

Abstract

The utility model discloses a paint brushing machine for a small sand core. A sand core rotating device of the paint brushing machine comprises an inner support, a turntable, a hollow shaft, a driven gear, a rotating inlet and the like, the inner supporting bottom plate is installed on the horizontal rotating disc through a positioning pin, and the hollow shaft is fixedly connected with the rotating disc and the driven gear. An inflation capsule is installed in a groove in the outer circumference of the inner support and connected with the upper end of a hollow shaft through an annular pipe and an air inlet valve, and the lower end of the hollow shaft is connected with a compressed air pipeline through a rotary inlet. The banister brush is fixedly installed on a rotating shaft of the rotating device, the rotating device and the nozzle are installed on the moving frame, and the moving frame can move in a channel steel guide rail on the upper portion of the support. The hose of the coating device adapts to movement of the nozzle. Paint is sprayed on the banister brush, small sand cores are brushed, paint dripping is avoided, brushing is mechanized, efficiency is high, and the thickness is uniform.

Description

Technical Field

[0001] The utility model is applied to the field of cast pipe production and relates to a T-shaped socket sand core of a cast pipe, in particular to a coating machine which automatically coats paint on a small sand core. Background Art

[0002] GB / 13295 "Ductile Iron Pipes, Fittings and Accessories for Water and Gas Pipelines" provides multiple socket types such as T-type, K-type, N1-type, S-type, etc. The most widely used is the T-type socket. Figure 1 As shown, the socket cavity 3 is formed by using the cavity between the sand core 1 and the pipe mold 2. Before installing the sand core 1 on the socket end of the pipe mold 2, the outer surface of the sand core in contact with the molten iron needs to be coated with graphite paint to prevent sand from sticking to the socket of the cast pipe and improve the surface quality of the socket casting.

[0003] For small sand cores of cast pipe sockets with specifications above DN1400, it is difficult to transport them, and the paint is usually applied manually. The thickness of the paint applied manually is unstable, the work intensity is high, and there is a lot of waste. The black graphite paint pollutes the environment, the working environment is poor, and the brushing efficiency is low, resulting in high process costs. After the small sand cores are transported by robots, it becomes necessary to mechanize the brushing of the paint and reduce the process cost.

[0004] CN112091183A discloses a sand core outer wall dip coating system, including a base, a coating supply station, a dip coating pool, a sand core lifting device, a sand core plugging device, etc. The upper mouth of the sand core is sealed with a sand core mouth sealing ring, and the sand core is sunk into the dip coating pool, so that the coating will not spread into the interior of the sand core. After dipping, it rises and resets. Mechanized automatic operation improves work efficiency and reduces errors caused by manual labor. CN112296276B discloses an automatic dip coating device for cast pipe sand cores, including a dip coating circulation device that circulates the dip coating liquid to prevent the coating from precipitating, a jacking device that makes the dip coating circulation device rise, a rotating device that cooperates with the jacking device to rotate the dip coating circulation device, and a sand core sealing device that is used to seal the cast pipe sand core to ensure that the inside of the sand core is not stained with the dip coating liquid. The above two patents use dip coating to apply coating on the outer surface of the socket. The coating thickness is directly related to the viscosity and fluidity of the coating, and the thickness is usually uneven.

[0005] CN216800246U discloses a ductile iron pipe sand core coating machine, which includes a frame, a rotating mechanism, a driving mechanism and a coating mechanism. The driving mechanism drives the rotating mechanism on the frame to rotate, a fixed disk is installed on the rotating mechanism, the coating mechanism is arranged above the fixed disk, and the sand core is fixed on the fixed disk. The paint is sprayed onto the surface of the sand core by a pump, and the brush is close to the rotating sand core for coating, so as to achieve the purpose of automatically brushing the paint evenly. This coating method causes the paint on the sand core to drip and waste, and the paint on the brush accumulates more and more, and the coating thickness cannot be controlled. Utility Model Content

[0006] The technical problem solved by the utility model is to provide a paint brush coating machine for small sand cores, which can spray paint on a brush to reduce the waste of paint and ensure uniform coating by rotating the brush.

[0007] The technical solution adopted by the utility model is: the paint brush coating machine for small sand cores includes a sand core rotating device, a driving device, a paint device and a brush device, etc. The sand core rotating device includes an inner support, a turntable, a hollow shaft, a driven gear, a rotating inlet, etc. The bottom plate of the inner support is positioned and installed on the horizontal turntable through a positioning pin, and the turntable is fixedly connected to the hollow shaft. The hollow shaft is fixedly connected to the driven gear, and the driven gear drives the turntable and the inner support to rotate through the hollow shaft. The outer circumference of the inner support is a groove structure, and an inflatable capsule is installed in the groove. The inflatable capsule is connected to the upper end of the hollow shaft through an annular tube, a bronchus and an air intake valve on the bronchus, and an air release valve is installed on the annular tube; the lower end of the hollow shaft is connected to the compressed air pipeline through a rotating inlet.

[0008] Furthermore, the positioning pins not only position but also transmit torque, and the positioning pins are preferably two symmetrical ones.

[0009] Furthermore, the paint tube of the paint device includes a fixed tube and a retractable hose, and the hose is used to adapt to the movement of the spray head.

[0010] Furthermore, the number of the sand core rotating devices is three or four, and the rotation speeds and sizes of the soft brushes are different.

[0011] Furthermore, the brush device is mounted on a bracket, and includes a soft brush, a rotating device, a mobile frame, a hydraulic cylinder, etc. The soft brush is an inner cylinder and an outer bristle structure, and is fixedly mounted on the rotating shaft of the rotating device. The rotating device is mounted on the mobile frame, and the mobile frame is connected to the cylinder rod of the hydraulic cylinder and can move in the channel steel guide rail on the upper part of the bracket; the spray head of the coating device is fixed on the mobile frame, and the distance between the spray head and the soft brush is fixed, so as to ensure the uniformity of coating spraying on the soft brush.

[0012] Furthermore, the rotating disk, inner support, spray head and soft brush are arranged in the cylinder, the bottom of the cylinder is provided with a paint drop opening, and the upper opening is provided with two symmetrical flaps. The entire sand core brushing paint operation is performed in a closed space. The opening on the flap that is matched with the rotating shaft of the rotating device is sealed with rubber or a wool row.

[0013] Furthermore, the driving gear and the driven gear of the driving device are arranged below the outside of the cylinder to increase the friction service life.

[0014] The utility model has the following beneficial effects: the utility model sprays the paint on the soft brush, and the soft brush is used to brush the small sand core, so there will be no excessive paint dripping, thus saving paint. The whole painting process is mechanized, the painting efficiency is high, and the coating thickness is uniform. The paint spraying and painting are carried out in a closed space, so there is no environmental pollution and waste of paint. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the T-shaped socket cavity;

[0016] Figure 2 is a front view schematic diagram of embodiment 1, and is also Figure 4 AA cross-sectional diagram of ;

[0017] Figure 3 yes Figure 1 A partial enlarged schematic diagram of

[0018] Figure 4 yes Figure 1 Schematic diagram from top view;

[0019] Figure 5 is a top view schematic diagram of Example 2;

[0020] Figure 6 It is a schematic diagram of the structure of a large soft brush;

[0021] In the figure: 1-sand core, 2-tube mold, 3-socket cavity;

[0022] 5-inner support, 6-turntable, 7-hollow shaft, 8-driven gear, 9-rotating inlet, 10-driving gear, 11-reducer, 12-motor, 13-paint tank, 14-mud pump, 15-bracket, 16-sprinkler, 17-hose, 18-hydraulic cylinder, 19-mobile frame, 20-rotating device, 21-soft brush, 22-air release valve, 23-air inlet valve, 24-locating pin, 25-inflatable capsule, 26-cylinder, 27-ring tube;

[0023] 211-cylinder, 212-bristles. DETAILED DESCRIPTION

[0024] In the attached drawings, non-critical components such as reinforcing ribs and support rods are not shown, and components that are not drawn in detail belong to the prior art. The automatic control technology belongs to the prior art and is not described in detail. Example 1

[0025] The paint brush coating machine of this embodiment is as shown in the attached Figure 2-4As shown, it includes a sand core rotating device, a driving device, a coating device and a brush device. The driving device includes a motor 12, a reducer 11, a driving shaft, a driving gear 10, etc. The motor 12 drives the driving shaft to rotate through the reducer 11, and the driving shaft drives the driving gear 10 to rotate. The driving gear 10 cooperates with the three driven gears 8 to drive the three sand core rotating devices to rotate simultaneously.

[0026] The sand core rotating device includes an inner support 5, a turntable 6, a hollow shaft 7, a driven gear 8, a rotating inlet 9, etc. The turntable 6 is horizontal and fixedly connected to the hollow shaft 7, and the hollow shaft 7 is fixedly connected to the driven gear 8. When the driven gear 8 rotates under the action of the driving gear 10, the turntable 6 is driven to rotate horizontally through the hollow shaft 7. The bottom plate of the inner support 5 is used to receive the sand core, and the bottom plate is positioned and installed on the horizontal turntable 6 through the positioning pin 24. The positioning pin 24 is not only used to position the inner support 5, but also drives the inner support 5 to rotate. The outer circumference of the inner support 5 is a groove structure, and an inflatable capsule 25 is installed in the groove. The inflatable capsule 25 is similar to a bicycle inner tube. When filled with pressurized gas, the inflatable capsule can only expand outward under the restriction of the groove, and retracts when deflated. The inflatable capsule is connected to the upper end of the hollow shaft 7 through the annular tube 27, the bronchus and the air inlet valve 23 on the bronchus. The deflation valve 22 is installed on the annular tube 27, as shown in the attached Figure 3 and attached Figure 4 As shown. The air inlet valve 23 and the air release valve 22 are automatically controlled by the operating program. At the lower end of the hollow shaft 7, it is connected to the compressed air pipeline through the rotating inlet 9. When the hollow shaft 7 rotates, the compressed air pipeline is fixed.

[0027] The coating device includes a coating tank 13, a mud pump 14, a nozzle 16 and a coating pipe. A stirring blade is installed in the coating tank 13 to ensure that the coating is suspended without settling by continuously stirring the coating. The mud pump 14 provides power for the transportation of the coating. The coating pipe includes a hard pipe and a hose 17. The hard pipe is a fixed pipe, and the hose 17 can be extended and retracted with the movement of the nozzle 16 and the mobile frame 19.

[0028] The brush device includes a soft brush 21, a rotating device 20, a mobile frame 19, a hydraulic cylinder 18, etc., which are installed on a bracket 15. A channel steel guide rail is provided on the upper part of the bracket 15. The soft brush 21 is cylindrical, and the shape and size of its outer cylindrical surface correspond to the shape and size of the outer circle of the sand core. The soft brush 21 is fixedly installed on the rotating shaft of the rotating device 20, and the rotating device 20 is installed on the mobile frame 19. The small wheel of the mobile frame 19 is set in the channel steel guide rail and can be guided and rotated in the channel steel. One end of the mobile frame 19 is connected to the cylinder rod of the hydraulic cylinder 18. The nozzle 16 is fixed on the mobile frame 19, and the distance between the nozzle and the soft brush is kept fixed, so as to ensure the uniformity of the paint spraying on the soft brush.

[0029] When this embodiment is used, an appropriate inner support 5 is selected according to the sand core specifications, and the inner support 5 is placed on the horizontal turntable 6 and positioned with a positioning pin 24. Since the positioning pin 24 also has the function of transmitting the rotational torque, two symmetrical ones are preferably set. Then the air pipe is connected to check the working status of the air release valve 22 and the air inlet valve 23. A soft brush 21 corresponding to the sand core is selected and fixedly installed on the rotating shaft of the rotating device 20. After the three sand cores 1 are positioned and hoisted into the inner support 5, all the air release valves 22 are closed, and all the air inlet valves 23 are opened. The compressed air enters the respective inflatable capsules 25 through the rotating inlet 9, the hollow shaft 7, and the annular tube 27 respectively, and the inflatable capsules 25 expand to contact the inner circumference of the sand core. Even if the sand core is placed eccentrically on the inner support, the expanded inflatable capsule can move the sand core horizontally so that the sand core is concentric with the inner support. When the inner support rotates, the friction between the inflatable capsule and the inner surface of the sand core drives the sand core to rotate. The rotating device 20 is started to drive the soft brush 21 to rotate, and the mud pump 14 is started to suck the paint from the paint tank 13 and transport it to the nozzle 16 through the paint pipe. The nozzle 16 evenly sprays the paint on the soft brush 21, and the gap of the soft brush 21 carries the paint. The cylinder rod of the hydraulic cylinder 18 extends to drive the soft brush 21 to move toward the sand core. When the soft brush contacts the three sand cores at the same time, the rotating soft brush is deformed, and the paint is squeezed out and brushed onto the outer surface of the rotating sand core. The rotation direction of the driving gear should be the same as that of the soft brush. In this way, the rotation directions of the three sand cores are the same and opposite to the rotation direction of the soft brush, which is conducive to the soft brush evenly brushing the paint. After the sand core is brushed, the mud pump, the rotating device, and the motor are turned off, the hydraulic cylinder drives the soft brush to retreat, the air inlet valve is closed, the air release valve is opened, the inflatable capsule is retracted, and the sand core is hoisted away to complete a brushing cycle of the three small sand cores.

[0030] In order to realize clean production, the turntable, inner support, nozzle and soft brush are all arranged in the cylinder 26. The bottom of the cylinder 26 is provided with a paint drop port, through which the paint dripped from the soft brush and sand core, as well as the paint cleaned from the inner wall of the cylinder can be returned to the paint tank through the paint drop port for recycling. Two symmetrical flaps are arranged at the positions of the two straight edges of the upper opening of the cylinder 26. The flaps are designed with openings to match the telescopic movement of the rotating shaft of the rotating device. The openings are sealed with soft rubber or with a hard hair row. The deformation ability of the soft rubber or the hard hair row can be used to seal the opening and realize the movement of the rotating shaft. It is just that the flap needs to be opened once each time the sand core is hoisted.

[0031] In order to prevent the gears from being contaminated by paint in the cylinder and causing friction and wear during the rotation process, in this embodiment, the driving gear and the driven gear are designed to be located below the cylinder, and the space above ensures the convenience of taking and placing the sand core. Example 2

[0032] In Example 1, three small sand cores can be brushed at one time. Based on Example 1, this embodiment changes the outer diameter of the driving gear 10 and the driven gear 8, and the center distance between the driving shaft and the driven shaft, so that four small sand cores can be brushed at one time. Figure 5 To ensure that the soft brush 21 contacts four small sand cores at the same time, the outer diameter of the soft brush should be increased. To reduce the amount of invalid paint stored in the soft brush, the structure of the soft brush is as shown in the attached figure. Figure 6 As shown, the structure of the external bristles 212 fixed on the internal cylinder 211. The cylinder 211 can be made of hard materials such as wood, plastic, steel, etc., and does not store paint. The external bristles 212 can store paint. The shape and size of its outer circumference correspond to the shape and size of the outer surface of the small sand core. After spraying and storing the paint, the stored paint can be applied to the outer circumference of the small sand core by extrusion deformation. This structure can greatly save paint.

[0033] The utility model, under the premise of mechanically transporting multiple small sand cores, adds detectors and controllers to the equipment. The above operations can be automatically controlled through the compiled operation program, thereby realizing mechanized automatic brushing and reducing labor costs. The paint is sprayed on the soft brush, and the small sand cores are brushed by the soft brush. There will be no excessive paint dripping, saving paint. The soft brush and the small sand core rotate relative to each other. The entire brushing process is mechanized, with high brushing efficiency and uniform coating thickness. Paint spraying and brushing are carried out in a closed space, without environmental pollution and waste of paint. The inner support is only connected by positioning pins, which is convenient and quick to disassemble and replace, and accurate positioning.

Claims

1. A paint brush coating machine for small sand cores, comprising a sand core rotating device, a driving device, a paint device and a brush device, characterized in that: The sand core rotating device comprises an inner support (5), a rotating disk (6), a hollow shaft (7), a driven gear (8), and a rotating inlet (9); the bottom plate of the inner support (5) is positioned and mounted on the horizontal rotating disk (6) via a positioning pin (24); the rotating disk (6) is fixedly connected to the hollow shaft (7); and the hollow shaft (7) is fixedly connected to the driven gear (8); the outer circumference of the inner support (5) is a groove structure, and an inflatable capsule (25) is installed in the groove; the inflatable capsule (25) is connected to the upper end of the hollow shaft (7) via an annular tube (27), a bronchus, and an air inlet valve (23) on the bronchus; and an air release valve (22) is installed on the annular tube (27); the lower end of the hollow shaft (7) is connected to a compressed air pipeline via a rotating inlet (9).

2. A paint brush coating machine for small sand cores according to claim 1, characterized in that: The positioning pins (24) are two symmetrical ones.

3. A paint brush coating machine for small sand cores according to claim 1, characterized in that: The paint pipe of the paint device comprises a fixed pipe and a retractable hose (17).

4. The paint brush coating machine for small sand cores according to claim 1, characterized in that: The number of the sand core rotating devices is three or four.

5. The paint brush coating machine for small sand cores according to claim 1, characterized in that: The brush device is mounted on a bracket and comprises a soft brush (21), a rotating device (20), a movable frame (19), and a hydraulic cylinder (18); the soft brush (21) is fixedly mounted on the rotating shaft of the rotating device (20); the rotating device (20) is mounted on the movable frame (19); the movable frame (19) is connected to the cylinder rod of the hydraulic cylinder (18) and can move within a channel steel guide rail on the upper part of the bracket; the spray head (16) of the coating device is fixed on the movable frame (19).

6. A paint brush coating machine for small sand cores according to claim 5, characterized in that: The rotating disk (6), the inner support (5), the spray head (16) and the soft brush (21) are arranged in a cylinder (26); a paint drop opening is arranged at the bottom of the cylinder (26), and two symmetrical flaps are arranged at the top.

7. A paint brush coating machine for small sand cores according to claim 6, characterized in that: The opening on the flip cover that is movably matched with the rotating shaft is sealed with rubber or wool.

8. The paint brush coating machine for small sand cores according to claim 6, characterized in that: The driving gear (10) and the driven gear (8) of the driving device are arranged below the outside of the cylinder (26).

9. The paint brush coating machine for small sand cores according to claim 5, characterized in that: The soft-bristle brush (21) is a structure with an inner cylinder and outer bristles.

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