Coating brushing machine for large sand core

Abstract

The utility model discloses a coating brushing machine for a large sand core. The banister brush is installed on a rotating shaft of the rotating device, the rotating device is installed on the movable frame, and the movable frame can move in a channel steel guide rail on the upper portion of the support and is connected with a cylinder rod of a hydraulic cylinder on the support. A nozzle of the coating device is fixed to the movable frame, the distance between the nozzle and a banister brush is fixed, and a telescopic hose adapts to movement of the nozzle. A turntable of the sand core rotating device is horizontal and is fixedly connected with a hollow shaft, an inner support is mounted on the turntable through a positioning pin, an inflatable capsule is mounted in a groove in the outer circle of the inner support, the sand core is positioned and fixed by inflating and expanding the inflatable capsule, and the lower end of the hollow shaft is connected with a compressed air pipeline through a rotating inlet. According to the sand core brushing device, mechanical brushing of a large sand core can be achieved, the coating thickness is uniform, the brushing efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] The utility model is applied in the field of cast pipe production and relates to a cast pipe T-shaped socket sand core, specifically a coating machine for automatically coating a large sand core with paint. 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 of the socket of the cast pipe is formed by the cavity between the sand core 1 and the pipe mold 2. Before the sand core 1 is installed 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] 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. CN216800246U discloses a ductile iron pipe sand core coating machine, including a frame, a rotating mechanism, a driving mechanism and a coating mechanism, wherein 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 above patent application is suitable for small-sized sand cores, and it is not convenient to use large sand cores with a specification of more than DN1000 for the socket of a cast pipe. CN218078660U discloses an automatic coating device for annular sand cores, and the coating brushing method is consistent with the above CN216800246U, in which the coating is sprayed onto the surface of the sand core, and the brush is close to the rotating sand core for coating. This coating method is likely to cause the coating on the sand core to drip and waste, and the coating on the brush will accumulate more and more, and the coating thickness cannot be controlled. Moreover, it is not sprayed in a closed environment, which is easy to cause black graphite pollution in the working environment.

[0004] For large sand cores above DN1000, 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 large sand cores are transported by robots, it becomes necessary to mechanize the paint application and reduce process costs. Utility Model Content

[0005] The technical problem solved by the utility model is: to provide a paint brush coating machine for large sand cores, which realizes the mechanization of paint coating under the premise of mechanical handling, improves the paint coating efficiency of large sand cores, and reduces the process cost.

[0006] The technical solution adopted in this practical application is: the paint brush coating machine for large sand cores includes a sand core rotating device, a paint device and a brush device. The brush device is installed on a bracket, including a soft brush, a rotating device, a mobile frame, and a hydraulic cylinder; the soft brush is fixedly installed on the rotating shaft of the rotating device, the rotating device is installed on the mobile frame, the mobile frame moves in the channel steel guide rail on the upper part of the bracket, the mobile frame is connected to the cylinder rod of the hydraulic cylinder, and the hydraulic cylinder is fixed on the bracket; the spray head of the paint 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 the paint spraying on the soft brush. The sand core rotating device includes an inner support, a hollow shaft, and a turntable. The turntable is horizontal and fixedly connected to the hollow shaft, and can rotate horizontally driven by a motor and a reducer; the bottom plate of the inner support is installed on the turntable through a positioning pin, and the positioning pin plays the role of positioning and transmitting the rotational torque, and it is preferable to have two symmetrical ones.

[0007] 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.

[0008] Furthermore, the outer circumference of the inner support is a groove, 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 air pipe and an air inlet valve, and an air release valve is installed on the annular air pipe. The inflatable capsule inflates and expands to contact the inner surface of the sand core, which plays a role in positioning and fixing the sand core. The lower end of the hollow shaft is connected to the compressed air pipeline through a rotating inlet to ensure normal ventilation when the hollow shaft rotates.

[0009] Furthermore, the rotating disk, inner support, spray head and soft brush are arranged in the cylinder, and two symmetrical flaps are arranged on the upper opening of the cylinder, so that the whole sand core brushing paint operation is carried out in a closed space. The opening of the flap that cooperates with the movement of the rotating shaft is sealed with rubber or a wool row. The bottom of the cylinder is provided with a paint drop port, which can transport excess paint to the paint tank.

[0010] Furthermore, the rotating device is mounted on the fixed plate of the mobile frame, and no cantilever-type bending deformation occurs. Both ends of the rotating shaft are mounted on the mobile frame, and no cantilever-type bending deformation occurs.

[0011] The beneficial effects of this practicality are: under the premise that the large sand core can be mechanically transported, this practicality realizes the mechanized automatic brushing of the large sand core coating, the coating thickness is uniform, the brushing is carried out in a closed space, there is no environmental pollution and waste of paint, the brushing efficiency is improved, and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the T-shaped socket cavity;

[0013] Figure 2 is a front view schematic diagram of Embodiment 1;

[0014] Figure 3 yes Figure 2 Schematic diagram of top view;

[0015] Figure 4 Schematic diagram of the brush device of embodiment 2

[0016] In the figure: 1-sand core, 2-tube mold, 3-socket cavity;

[0017] 5-inner support, 6-turntable, 7-hollow shaft, 8-reducer, 9-motor, 10-paint tank, 11-mud pump, 12-bracket, 13-spray head, 14-hose, 15-hydraulic cylinder, 16-movable frame, 17-rotating device, 18-soft brush, 19-air release valve, 20-locating pin, 21-inlet valve, 22-inflatable capsule, 23-rotating inlet, 24-cylinder. DETAILED DESCRIPTION

[0018] 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

[0019] The paint brush coating machine of this embodiment is as shown in the attached Figure 2 and attached Figure 3 As shown, it includes a sand core rotating device, a coating device and a brush device.

[0020] The sand core rotating device includes an inner support 5, a hollow shaft 7, a turntable 6 and a driving device. The driving device includes a motor 9, a reducer 8, a gear set, etc. The motor 9 rotates, and the hollow shaft 7 is driven to rotate through the reducer 8 and the gear set. The turntable 6 is horizontal and fixedly connected to the hollow shaft 7. The hollow shaft 7 can drive the turntable 6 to rotate horizontally. The bottom plate of the inner support 5 is positioned and installed on the horizontal turntable 6 through the positioning pin 20. The positioning pin 20 is not only used to position the inner support 5, but also drives the inner support to rotate. The bottom plate of the inner support 5 is used to receive the sand core, and its outer circumference is a groove. An inflatable capsule 22 is installed in the groove. The inflatable capsule 22 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 22 is connected to the upper end of the hollow shaft 7 through the annular trachea, the bronchus and the air inlet valve 21 on the bronchus. The deflation valve 19 is installed on the annular trachea, as shown in the attached Figure 3 As shown. The air inlet valve 21 and the air release valve 19 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 23, and when the hollow shaft 7 rotates, the compressed air pipeline is fixed.

[0021] The coating device includes a coating tank 10, a mud pump 11, a nozzle 13 and a coating pipe. A stirring blade is installed in the coating tank 10 to ensure that the coating is suspended and not precipitated by stirring the coating. The mud pump 11 provides power for the transportation of the coating. The coating pipe includes a hard pipe and a hose 14. The hard pipe is a fixed pipe, and the hose 14 can be extended and retracted with the movement of the nozzle 13 and the mobile frame 16.

[0022] The brush device includes a soft brush 18, a rotating device 17, a mobile frame 16, a hydraulic cylinder 15, etc., which are installed on the bracket 12. A channel steel guide rail is provided on the upper part of the bracket 12. The soft brush 18 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 18 is fixedly installed on the rotating shaft of the rotating device 17, and the rotating device 17 is installed on the mobile frame 16. The small wheel of the mobile frame 16 is set in the channel steel guide rail and can be guided and rotated in the channel steel. One end of the mobile frame 16 is connected to the cylinder rod of the hydraulic cylinder 15. The nozzle 13 is fixed on the mobile frame 16, 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.

[0023] 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 20. Since the positioning pin 20 also has the function of transmitting rotational torque, two symmetrical ones are preferably set. Then connect the air pipe and check the working status of the air release valve 19 and the air inlet valve 21. Select a soft brush 18 that matches the sand core and fix it on the rotating shaft of the rotating device 17. After the sand core 1 is hoisted and sleeved into the inner support 5, close the air release valve 19, open the air inlet valve 21, and the compressed air enters the inflatable capsule 22 through the rotating inlet 23, the hollow shaft 7, and the air pipe. The inflatable capsule 22 expands and contacts 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. Start the rotating device 17 to drive the soft brush 18 to rotate, start the mud pump 11, suck the paint from the paint tank 10, and transport it to the nozzle 13 through the paint pipe. The nozzle 13 evenly sprays the paint on the soft brush 18, and the gap between the soft brush 18 carries the paint. The cylinder rod of the hydraulic cylinder 15 extends, driving the soft brush to move toward the sand core. When the soft brush contacts the sand core, the rotating soft brush deforms and squeezes the paint out and brushes it onto the outer surface of the rotating sand core. The rotation direction of the sand core should be opposite to that of the soft brush, one counterclockwise and the other clockwise. After the sand core is painted, 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 the painting cycle of a large sand core.

[0024] In order to realize clean production, the turntable, inner support, nozzle and soft brush are all arranged in the cylinder 24. The bottom of the cylinder 24 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 continued use. Two symmetrical flaps are arranged at the positions of the two straight edges of the upper opening of the cylinder 24. The openings that match the telescopic movement of the rotating shaft 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. Example 2

[0025] In Example 1, the soft brush 18 is suspended on the rotating shaft, and the rotating device 17 is installed on the suspension plate of the mobile frame 16. The rotating shaft and the suspension plate are both cantilevered and deformed. When the soft brush is applied, the deformation of the rotating shaft and the suspension plate is superimposed, which will cause the thickness of the upper and lower coatings on the outer surface of the sand core to be uneven. For this reason, it is improved to attach Figure 4The structure shown. The hanging plate of the mobile frame 16 is changed into a fixed plate, and the rotating device 17 is installed on the fixed plate. The fixed plate is fixed at least at the corresponding two ends, and no cantilever beam force will be generated. The upper and lower ends of the rotating shaft of the rotating device 17 are installed on the mobile frame and fixed by the mobile frame, and the rotating shaft basically does not generate cantilever beam bending deformation. In this way, the upper and lower coatings on the outer surface of the sand core are evenly brushed. This structure only increases the difficulty of replacing the overall soft brush. The soft brush should adopt an assembly structure of two semicircles.

[0026] The practicality of this invention is that under the premise that the large sand core can be mechanically transported, detectors and controllers are installed on the equipment. The above operations can be automatically controlled through the compiled operation program, thereby realizing mechanized automatic brushing and reducing labor costs. The entire brushing process is mechanized, with high brushing efficiency and uniform coating thickness. The brushing is carried out in a closed space, without environmental pollution and waste of paint. The internal support is only connected by positioning pins, which is convenient and quick to disassemble and replace, and accurate in positioning.

Claims

1. A paint brush coating machine for large sand cores, comprising a sand core rotating device, a paint device and a brush device; characterized in that: The brush device is mounted on a bracket, and comprises a soft brush (18), a rotating device (17), a movable frame (16), and a hydraulic cylinder (15); the soft brush (18) is fixedly mounted on the rotating shaft of the rotating device (17); the rotating device (17) is mounted on the movable frame (16); the movable frame (16) moves in a channel steel guide rail at the upper portion of the bracket; the movable frame (16) is connected to the cylinder rod of the hydraulic cylinder (15); the spray head (13) of the coating device is fixed on the movable frame (16); the sand core rotating device comprises an inner support (5), a hollow shaft (7), and a turntable (6); the turntable (6) is horizontal and fixedly connected to the hollow shaft (7); the bottom plate of the inner support (5) is mounted on the turntable (6) via a positioning pin (20).

2. A paint brush coating machine for large sand cores according to claim 1, characterized in that: The paint tube of the paint device comprises a fixed tube and a retractable hose (14).

3. The coating brush coating machine for large sand cores according to claim 1, characterized in that: The outer circumference of the inner support (5) is a groove, and an inflatable capsule (22) is installed in the groove. The inflatable capsule (22) is connected to the upper end of the hollow shaft (7) through the annular trachea, the bronchus and the air inlet valve (21) on the bronchus. The annular trachea is equipped with an air release valve (19).

4. A paint brush coating machine for large sand cores according to claim 3, characterized in that: The lower end of the hollow shaft (7) is connected to a compressed air pipeline via a rotating inlet (23).

5. The coating brush coating machine for large sand cores according to claim 1, characterized in that: The positioning pins (20) are two symmetrical ones.

6. The coating brush coating machine for large sand cores according to claim 1, characterized in that: The rotating disk (6), the inner support (5), the spray head (13) and the soft brush (18) are arranged in a cylinder (24); a paint drop opening is arranged at the bottom of the cylinder (24), and two symmetrical flip covers are arranged at the top.

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

8. The coating brush coating machine for large sand cores according to claim 1, characterized in that: The rotating device (17) is mounted on a fixed plate of the movable frame (16).

9. The coating brush coating machine for large sand cores according to claim 1, characterized in that: Both ends of the rotating shaft are mounted on a moving frame (16).

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