Electrophoretic coating device for metal castings

Abstract

The present invention belongs to the technical field of electrophoretic coating devices, and discloses an electrophoretic coating device for metal castings, including an electrophoretic tank, a lifting unit is provided in the electrophoretic tank, a frame is fixed to the output end of the lifting unit, and a plurality of contact switching units are fixed on the frame, the contact switching unit includes a mounting shell, a plurality of telescopic mechanisms and a driving mechanism, the mounting shell is fixed above the frame, and coaxial rod holes are opened on the upper and lower surfaces of the mounting shell, the plurality of telescopic mechanisms and the driving mechanism are all fixed in the mounting shell, and the telescopic mechanism is located between two vertically corresponding rod holes; the telescopic mechanism includes an upper cylinder body that is fixed and connected as one body and a lower cylinder body with elasticity, a piston rod is slidably provided in the upper cylinder body and an isolation frame is fixed thereto, and the piston rod is located above the isolation frame; the present invention can continuously switch the contact points of the metal castings during the electrophoretic coating of the metal castings, thereby realizing comprehensive coating of the metal castings.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrophoretic coating devices, and in particular relates to an electrophoretic coating device for metal castings. Background Art

[0002] During the processing of metal castings, electrophoretic coating devices are generally used to perform electrophoretic coating on the metal castings to form a good protective layer on the surface of the metal castings and improve the performance of the metal castings. However, after the metal castings are placed inside the tank body, since the metal castings are in contact with the supporting components in the tank body, the contact position between the two cannot be effectively electrophoretically coated, resulting in a decrease in the quality of the electrophoretic coating of the metal castings. Therefore, this technical problem needs to be solved. Summary of the Invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a metal casting electrophoretic coating device, which effectively solves the problem that when the metal casting is placed inside the tank body, the metal casting is in contact with the supporting components inside the tank body, and the contact position between the two cannot be effectively electrophoretically coated, thereby resulting in a decrease in the electrophoretic coating quality of the metal casting.

[0004] To achieve the above objectives, the present invention provides the following technical solutions: a metal casting electrophoretic coating device, comprising an electrophoretic tank, a lifting unit provided within the electrophoretic tank, a frame fixed to the output end of the lifting unit, a plurality of contact switching units fixed to the frame, the contact switching units comprising a mounting shell, a plurality of telescopic mechanisms, and a drive mechanism, the mounting shell being fixed above the frame, and having coaxial rod holes formed on the upper and lower surfaces of the mounting shell, the plurality of telescopic mechanisms and the drive mechanism being fixed within the mounting shell, and the telescopic mechanism being located between two vertically corresponding rod holes;

[0005] The telescopic mechanism comprises an upper cylinder body and an elastic lower cylinder body which are fixedly arranged and connected as one body. A piston rod is slidably arranged in the upper cylinder body and an isolation frame is fixedly arranged. The piston rod is located above the isolation frame.

[0006] Preferably, the driving mechanism includes a servo motor, a mounting frame and a roller, the servo motor is fixed in the mounting shell, the mounting frame is fixed on the output shaft of the servo motor, and the roller is rotatably mounted on the mounting frame.

[0007] Preferably, an outer ring body is rotatably provided on the outer side of the rotating roller, and the outer ring body is coaxially arranged with the rotating roller.

[0008] Preferably, the telescopic mechanism also includes an elastic member, an upper one-way valve, a lower one-way valve and a pressure relief valve. The elastic member surrounds the outside of the piston rod and is located in the upper cylinder. A plurality of upper through holes and a center hole are formed in the piston rod. The plurality of upper through holes are connected to the center hole. The upper one-way valve and the pressure relief valve are fixed inside the center hole, and the lower one-way valve is fixed at the mouth of the lower cylinder.

[0009] Preferably, the elastic member includes a telescopic spring, which surrounds the outside of the piston rod and is located in the upper cylinder. The shape of the piston rod is an inverted T-shape.

[0010] Preferably, the lifting unit includes multiple lifting mechanisms, which include an electric push rod and a protective cover. The electric push rod is fixed to the inner bottom wall of the electrophoresis tank, the output end of the electric push rod is fixed to the frame, and the protective cover is fixed between the outer bottom wall of the frame and the inner bottom wall of the electrophoresis tank and is sleeved on the outside of the electric push rod.

[0011] Preferably, a sealing ring is fixed inside the rod hole on the upper surface of the mounting shell, and the sealing ring is in sealing cooperation with the piston rod.

[0012] Preferably, a liquid inlet pipe and a liquid outlet pipe are fixedly provided on the electrophoresis tank, and a control valve is fixed on both the liquid inlet pipe and the liquid outlet pipe.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. During operation, by setting up multiple contact switching units, the contact points of the metal castings can be continuously switched during the electrophoretic coating process of the metal castings, thereby achieving comprehensive coating of the metal castings.

[0015] 2. During operation, through the cooperation of the telescopic mechanism and the driving mechanism, when the metal casting is located in the electrophoresis tank, the telescopic mechanism can be used to make the metal casting vibrate continuously up and down, thereby removing bubbles that may exist on the surface of the metal casting.

[0016] 3. During operation, when the metal casting is located in the electrophoretic tank, on the one hand, the telescopic mechanism can continuously transfer the particles in the liquid to the vicinity of the metal casting to ensure the quality of electrophoretic coating. On the other hand, the transferred liquid can also impact the surface of the metal casting, thereby further removing any bubbles that may exist on the surface of the metal casting.

[0017] 4. During operation, when the metal casting is separated from the liquid, on the one hand, the up and down movement of the piston rod can accelerate the separation of the liquid on the surface of the metal casting, and on the other hand, the lower cylinder can be used to transport air to form an airflow, which further accelerates the separation of the liquid on the surface of the metal casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0019] In the attached figure:

[0020] Figure 1 This is one of the structural schematic diagrams of a metal casting electrophoretic coating device of the present invention;

[0021] Figure 2 This is a second structural schematic diagram of a metal casting electrophoretic coating device according to the present invention;

[0022] Figure 3 For the present invention Figure 2 Schematic diagram of the top view structure in ;

[0023] Figure 4 This is a schematic diagram of the frame installation structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the cross-sectional structure of the installation shell of the present invention;

[0025] Figure 6 It is a schematic diagram of the exploded structure of the driving mechanism, telescopic mechanism and mounting shell of the present invention;

[0026] Figure 7 It is a schematic cross-sectional view of the telescopic mechanism of the present invention;

[0027] Figure 8 This is a schematic diagram of the cross-sectional structure of the piston rod of the present invention.

[0028] In the figure: 1. Electrophoresis tank; 2. Frame; 3. Mounting shell; 4. Rod hole; 5. Upper cylinder; 6. Lower cylinder; 7. Piston rod; 8. Isolation frame; 9. Servo motor; 10. Mounting frame; 11. Roller; 12. Outer ring; 13. Upper one-way valve; 14. Lower one-way valve; 15. Upper through hole; 16. Center hole; 17. Telescopic spring; 18. Electric push rod; 19. Protective cover; 20. Sealing ring; 21. Pressure relief valve; 22. Liquid inlet pipe; 23. Liquid outlet pipe; 24. Control valve. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] During the processing of metal castings, electrophoretic coating devices are generally used to perform electrophoretic coating on the metal castings to form a good protective layer on the surface of the metal castings and improve the performance of the metal castings. However, after the metal castings are placed inside the tank body, since the metal castings are in contact with the supporting components in the tank body, the contact position between the two cannot be effectively electrophoretically coated, resulting in a decrease in the quality of the electrophoretic coating of the metal castings. Therefore, this technical problem needs to be solved.

[0031] It should be noted that the metal castings coated by the electrophoretic coating device of the present invention can be heavy truck chassis castings, specifically frame castings, axle castings, suspension castings, steering castings or engine bracket castings. Among them, frame castings can be body crossbeams or frame main body castings. Axle castings can be bridge housings, wheel hubs or brake hubs. Suspension castings can be leaf spring seats, support seats and balance shaft housings, etc. Steering castings can be steering gear housings or steering knuckles. Engine bracket castings can be engine brackets.

[0032] Depend on Figures 1-8 The present invention relates to a metal casting electrophoretic coating device, comprising an electrophoretic tank 1, wherein a lifting unit is provided in the electrophoretic tank 1, a frame 2 is fixed to the output end of the lifting unit, a plurality of contact switching units are fixed to the frame 2, and the contact switching unit comprises a mounting shell 3, a plurality of telescopic mechanisms and a driving mechanism, the mounting shell 3 is fixed above the frame 2, and a coaxial rod hole 4 is formed on the upper and lower surfaces of the mounting shell 3, the plurality of telescopic mechanisms and the driving mechanism are all fixed in the mounting shell 3, and the telescopic mechanism is located between two vertically corresponding rod holes 4;

[0033] The telescopic mechanism includes an upper cylinder 5 and an elastic lower cylinder 6 which are fixedly arranged and connected as one body. A piston rod 7 is slidably provided in the upper cylinder 5 and an isolation frame 8 is fixed therein. The piston rod 7 is located above the isolation frame 8.

[0034] With this design, when in use, after the metal casting is placed inside the electrophoresis tank 1, the metal casting falls on the multiple contact switching units on the frame 2, and the multiple contact switching units support the metal casting. First, the multiple telescopic mechanisms are intermittently squeezed by the rotation of the driving mechanism. After being squeezed, the telescopic mechanisms change as follows:

[0035] After the lower cylinder 6 is squeezed, the internal pressure thereof increases, thereby pushing the piston rod 7, causing the piston rod 7 to move upward in the upper cylinder 5 and then extend out of the corresponding rod hole 4, thereby lifting the metal casting; when the driving mechanism is released from the squeezing of the lower cylinder 6, it has the deformation to restore its original shape under the self-action force of the lower cylinder 6. At this time, the pressure in the lower cylinder 6 becomes smaller and forms a negative pressure. Under the action of the negative pressure, the piston rod 7 moves downward in the upper cylinder 5 and then returns to the initial position, thereby realizing the up and down vibration process of the metal casting. As the driving mechanism rotates, the piston rods 7 in the multiple telescopic mechanisms move up and down in turn, thereby causing the metal casting to continuously fluctuate. In this process, bubbles that may be attached to the surface of the metal casting can be further removed, and since the multiple telescopic mechanisms are circumferentially distributed, the contact points with the metal casting can be continuously switched, thereby realizing comprehensive electrophoretic coating of the metal casting.

[0036] Specifically, the driving mechanism includes a servo motor 9, a mounting frame 10 and a roller 11. The servo motor 9 is fixed in the mounting shell 3, the mounting frame 10 is fixed on the output shaft of the servo motor 9, and the roller 11 is rotatably arranged on the mounting frame 10; an outer ring body 12 is also rotatably provided on the outer side of the roller 11, and the outer ring body 12 is coaxially arranged with the roller 11.

[0037] With this design, when in use, the servo motor 9 drives the mounting frame 10 to rotate, and the mounting frame 10 drives the roller 11 thereon to rotate, and the rotation of the roller 11 realizes the continuous squeezing process of the lower cylinder 6 in the telescopic mechanism.

[0038] Taking into account that during the electrophoretic coating process, as the electrophoresis proceeds, the particles near the metal casting are gradually consumed, in order to quickly replenish the particles near the metal casting, the telescopic mechanism also includes an elastic member, an upper one-way valve 13, a lower one-way valve 14 and a pressure relief valve 21. The elastic member surrounds the outside of the piston rod 7 and is located in the upper cylinder 5. A plurality of upper through holes 15 and a center hole 16 are formed in the piston rod 7. The plurality of upper through holes 15 are all connected to the center hole 16. The upper one-way valve 13 and the pressure relief valve 21 are both fixed inside the center hole 16, and the lower one-way valve 14 is fixed at the mouth of the lower cylinder 6.

[0039] With this design, when in use, after the lower cylinder 6 is squeezed and reaches the threshold of the pressure relief valve 21, the liquid in the lower cylinder 6 is discharged through the central hole 16, the pressure relief valve 21, the upper one-way valve 13, and the upper through hole 15 in sequence. After the lower cylinder 6 is free from squeezing, the elastic member and the lower cylinder 6 themselves act to generate a negative pressure inside the lower cylinder 6. With the use of the upper one-way valve 13 and the lower one-way valve 14, the liquid at the bottom of the electrophoresis tank 1 enters the interior of the lower cylinder 6, so that it can be discharged after the lower cylinder 6 is squeezed next time, thereby realizing continuous transfer of the liquid, so that sufficient particles are maintained near the metal casting, and the liquid discharged from the upper through hole 15 can also impact the lower surface of the metal casting, further reducing the possibility of bubbles.

[0040] Specifically, the elastic member comprises a telescopic spring 17, which surrounds the piston rod 7 outside and is positioned in the upper cylinder 5. The piston rod 7 is shaped like an inverted T. Designed like this, it is convenient to improve the speed during the return by the telescopic spring 17.

[0041] Specifically, the lifting unit includes multiple lifting mechanisms, which include an electric push rod 18 and a protective cover 19. The electric push rod 18 is fixed to the inner bottom wall of the electrophoresis tank 1, and the output end of the electric push rod 18 is fixed to the frame 2. The protective cover 19 is fixed between the outer bottom wall of the frame 2 and the inner bottom wall of the electrophoresis tank 1 and is sleeved on the outside of the electric push rod 18.

[0042] With this design, when the electrophoresis is completed, the electric push rod 18 drives the frame 2 to move upward, so that the metal casting can be separated from the liquid, and then the metal casting is vibrated through multiple contact switching units, thereby accelerating the separation of the liquid on the surface of the metal casting. Under the action of the lower cylinder 6, the air will be continuously transported, so that the air is discharged through the upper through hole 15 and blows on the surface of the metal casting, further accelerating the liquid separation process.

[0043] It should be noted that in the initial state, there is some liquid inside the lower cylinder 6, but since the volume of the lower cylinder 6 is small, it only takes a very short time to bring the liquid out through the airflow, and then the impact of the airflow can be used to accelerate the separation process of the liquid on the surface of the metal casting; the protective cover 19 is made of elastic material, such as rubber or silicone, which can protect the electric push rod 18.

[0044] In order to prevent liquid from entering the interior of the mounting housing 3, a sealing ring 20 is fixed inside the rod hole 4 on the upper surface of the mounting housing 3. The sealing ring 20 is in sealing engagement with the piston rod 7. This design improves the sealing performance between the piston rod 7 and the rod hole 4 through the sealing ring 20, preventing liquid from entering the interior of the mounting housing 3.

[0045] Specifically, the electrophoresis tank 1 is fixed with a liquid inlet pipe 22 and a liquid outlet pipe 23, and each of the liquid inlet pipe 22 and the liquid outlet pipe 23 is fixed with a control valve 24. This design facilitates the replenishment of liquid for the electrophoresis tank 1 through the liquid inlet pipe 22 and the discharge of liquid in the electrophoresis tank 1 through the liquid outlet pipe 23.

[0046] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A metal casting electrophoretic coating device, comprising an electrophoretic tank (1), wherein a lifting unit is provided in the electrophoretic tank (1), a frame (2) is fixed to the output end of the lifting unit, and a plurality of contact switching units are fixed on the frame (2), wherein the device is characterized in that: The contact switching unit comprises a mounting shell (3), a plurality of telescopic mechanisms and a driving mechanism; the mounting shell (3) is fixed above the frame (2), and coaxial rod holes (4) are provided on the upper and lower surfaces of the mounting shell (3); the plurality of telescopic mechanisms and the driving mechanism are fixed in the mounting shell (3), and the telescopic mechanism is located between two vertically corresponding rod holes (4); The telescopic mechanism comprises an upper cylinder (5) and an elastic lower cylinder (6) which are fixedly arranged and connected as one body. A piston rod (7) is slidably provided in the upper cylinder (5) and an isolation frame (8) is fixedly provided. The piston rod (7) is located above the isolation frame (8). The driving mechanism comprises a servo motor (9), a mounting frame (10) and a rotating roller (11); the servo motor (9) is fixed in the mounting shell (3); the mounting frame (10) is fixed on the output shaft of the servo motor (9); and the rotating roller (11) is rotatably mounted on the mounting frame (10).

2. The electrophoretic coating device for metal castings according to claim 1, characterized in that: An outer ring body (12) is also rotatably provided on the outer side of the rotating roller (11), and the outer ring body (12) is coaxially arranged with the rotating roller (11).

3. The electrophoretic coating device for metal castings according to claim 1, characterized in that: The telescopic mechanism further comprises an elastic member, an upper one-way valve (13), a lower one-way valve (14) and a pressure relief valve (21). The elastic member surrounds the outside of the piston rod (7) and is located in the upper cylinder (5). A plurality of upper through holes (15) and a center hole (16) are formed in the piston rod (7). The plurality of upper through holes (15) are all connected to the center hole (16). The upper one-way valve (13) and the pressure relief valve (21) are both fixed inside the center hole (16). The lower one-way valve (14) is fixed at the mouth of the lower cylinder (6).

4. The electrophoretic coating device for metal castings according to claim 3, characterized in that: The elastic member comprises a telescopic spring (17), which surrounds the outside of the piston rod (7) and is located in the upper cylinder (5). The piston rod (7) is in the shape of an inverted T.

5. The electrophoretic coating device for metal castings according to claim 1, characterized in that: The lifting unit includes multiple lifting mechanisms, and the lifting mechanisms include an electric push rod (18) and a protective cover (19). The electric push rod (18) is fixed to the inner bottom wall of the electrophoresis tank (1), the output end of the electric push rod (18) is fixed to the frame (2), and the protective cover (19) is fixed between the outer bottom wall of the frame (2) and the inner bottom wall of the electrophoresis tank (1) and is sleeved on the outer side of the electric push rod (18).

6. The electrophoretic coating device for metal castings according to claim 1, characterized in that: A sealing ring (20) is fixed inside the rod hole (4) on the upper surface of the mounting shell (3), and the sealing ring (20) is in sealing cooperation with the piston rod (7).

7. The electrophoretic coating device for metal castings according to claim 1, characterized in that: A liquid inlet pipe (22) and a liquid outlet pipe (23) are fixedly provided on the electrophoresis tank (1), and a control valve (24) is fixed on each of the liquid inlet pipe (22) and the liquid outlet pipe (23).

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