Chromium plating device for upper and lower surfaces of piston

Abstract

According to the technical scheme, the chromium plating device for the upper surface and the lower surface of the piston comprises two pictographic anodes, a cathode assembly, an opening and closing mechanism and a positioning mechanism, the pictographic anodes are matched with the upper surface and the lower surface of the piston in shape respectively, and the pictographic anodes are used for being inserted into the top and the bottom of the piston in the mode that gaps are formed between the pictographic anodes and the piston. A through hole is formed in the central axis of the conformal anode; the number of the cathode assemblies is two, and the cathode assemblies penetrate through the through holes in a one-to-one correspondence mode and are used for abutting against the top or the bottom of the piston. The opening and closing mechanism is provided with two movable ends, and the two movable ends are connected with the two conformal anodes respectively. The shape of the upper surface and the shape of the lower surface of the piston are matched through the pictographic anodes, during electroplating, the piston is transversely arranged, the upper surface and the lower surface are plated through the pictographic anodes respectively, uniform chromium plating can be conducted on the upper surface and the lower surface of the piston at the same time, and the chromium plating efficiency and quality of the upper surface and the lower surface of the piston are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of piston chrome plating, in particular to a chrome plating device for the upper and lower surfaces of a piston. Background Art

[0002] Piston chrome plating is a common surface treatment technology, mainly used to improve the performance and life of the piston. Chrome plating can provide a hard chrome layer on the piston surface.

[0003] The chrome plating requirements for the outer cylindrical surface and the upper and lower surfaces of the piston are different. Among them, the outer cylindrical surface of the part is plated with hard chrome to meet the wear resistance requirements, while the upper and lower surfaces of the part are plated with milky white chrome to meet the corrosion resistance requirements.

[0004] In the chrome plating on the upper and lower sides of parts, since the upper and lower sides of the piston are concave and not regular planes, and traditional anodes are usually designed to be flat or rod-shaped, in electroplating, for the complex shapes of the upper and lower sides of the piston, conventional flat anodes and rod-shaped anodes will cause uneven current distribution, resulting in inconsistent coating thickness and quality. Utility Model Content

[0005] In view of this, it is necessary to provide a chrome plating device for the upper and lower surfaces of the piston to solve the technical problem in the prior art that conventional flat anodes and rod-shaped anodes will cause uneven current distribution for the complex shapes of the upper and lower surfaces of the piston, resulting in inconsistent coating thickness and quality.

[0006] In order to achieve the above technical purpose, the technical solution of the utility model provides a chrome plating device for the upper and lower surfaces of a piston, comprising:

[0007] There are two pictographic anodes, which match the shapes of the upper and lower surfaces of the piston respectively, and are used to be inserted into the top and bottom of the piston with a gap between them. A through hole is opened on the central axis of the pictographic anode;

[0008] Cathode assemblies, the number of which is two, the cathode assemblies correspondingly pass through the through holes one by one, and are used to abut against the top or bottom of the piston;

[0009] An opening and closing mechanism having two movable ends, the two movable ends being respectively connected to the two pictographic anodes, and being used to drive the two pictographic anodes to move toward and away from each other; and

[0010] The positioning mechanism is used for the horizontal placement and positioning of the piston.

[0011] Furthermore, the cathode assembly includes an insulating support and a cathode terminal. The insulating support is arranged on the inner side of the through hole, and the cathode terminal is arranged on one side of the insulating support.

[0012] Further, a first wire is connected to the negative electrode end head, and the first wire penetrates through the insulating bracket for connecting to the negative pole of the power supply.

[0013] Further, the insulating bracket includes a support frame and a hollow cylinder. The support frame is fixed inside the through hole. The hollow cylinder is arranged at the axis of the support frame and penetrates through the support frame from left to right. One end of the negative electrode end head is fixed to one end of the hollow cylinder, and the first wire connected to the negative electrode end head passes through the insulating bracket from inside the hollow cylinder.

[0014] Further, a second wire is arranged on the pictographic anode for connecting to the positive pole of the power supply.

[0015] Further, the opening and closing mechanism includes an annular frame and a telescopic mechanism. The number of both the annular frame and the telescopic mechanism is two. The movable ends of the two telescopic mechanisms are respectively connected to the two annular frames, and the pictographic anodes are correspondingly arranged inside the annular frames.

[0016] Further, it further includes an electroplating tank, and both the opening and closing mechanism and the positioning mechanism are installed on the electroplating tank.

[0017] Further, the positioning mechanism includes a sleeve, and a sealing layer is arranged inside the sleeve.

[0018] Further, the sealing layer includes at least two sealing rings arranged inside the sleeve.

[0019] Further, the positioning mechanism further includes a lifting component. The lifting component is installed on the electroplating tank, and the movable end of the lifting component is connected to the sleeve for driving the sleeve to lift inside the electroplating tank.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows: By matching the upper surface shape and the lower surface shape of the piston with the pictographic anode, during electroplating, the piston is placed horizontally, and the upper surface and the lower surface are respectively electroplated with a pictographic anode, so that the upper and lower surfaces of the piston can be evenly chrome-plated simultaneously, improving the efficiency and quality of chrome-plating on the upper and lower surfaces of the piston. Description of the Drawings

[0021] Figure 1 is a three-dimensional structure diagram of the piston upper and lower surface chrome-plating device according to the embodiment of the present utility model;

[0022] Figure 2 is the piston upper and lower surface chrome-plating device according to the embodiment of the present utility model Figure 1 Partial enlarged view of part A;

[0023] Figure 3 is a front cross-sectional view of the structure of the piston upper and lower surface chrome-plating device according to the embodiment of the present utility model;

[0024] Figure 4 It is a schematic structural view of a piston upper and lower surface chromium plating device with an electroplating tank according to the embodiment of the present utility model;

[0025] Figure 5 It is a three-dimensional exploded view of a piston upper and lower surface chromium plating device with an electroplating tank according to the embodiment of the present utility model;

[0026] In the figure: 1, pictorial anode; 101, through hole; 102, second wire; 2, cathode assembly; 21, insulating bracket; 211, support frame; 212, hollow cylinder; 22, cathode end; 23, first wire; 3, opening and closing mechanism; 31, annular frame; 32, telescopic mechanism; 4, positioning mechanism; 41, sleeve; 42, sealing layer; 421, sealing ring; 43, lifting assembly; 5, electroplating tank; 6, piston. Specific embodiments

[0027] The following will specifically describe the preferred embodiments of the present utility model in conjunction with the accompanying drawings. Among them, the accompanying drawings form a part of this application and are used together with the embodiments of the present utility model to explain the principle of the present utility model, and are not used to limit the scope of the present utility model.

[0028] As Figures 1-5 shown, the present utility model provides a piston upper and lower surface chromium plating device, including a pictorial anode 1, a cathode assembly 2, an opening and closing mechanism 3, and a positioning mechanism 4. The number of pictorial anodes 1 is two, which respectively match the shapes of the upper surface and the lower surface of the piston 6, and are used to be inserted into the top and bottom of the piston 6 with a gap therebetween for the circulation of the electroplating solution. A through hole 101 is provided on the central axis of the pictorial anode 1 for the cathode assembly 2 to penetrate through; the number of cathode assemblies 2 is two, and the cathode assemblies 2 penetrate through the through holes 101 one by one and are used to abut against the top or bottom of the piston 6, so as to conduct the negative pole of the power supply to the piston 6. Similarly, the pictorial anode 1 is conducted to the positive pole of the power supply through a wire; the opening and closing mechanism 3 has two movable ends, and the two movable ends are respectively connected to the two pictorial anodes 1 and are used to drive the two pictorial anodes 1 to approach and move away from each other. In the approaching action, the two pictorial anodes 1 are respectively inserted into the top and bottom of the piston 6 with a gap, and in the moving away action, the two pictorial anodes 1 are respectively disengaged from the two ends of the piston 6, facilitating the separation of the piston 6 from the two pictorial anodes 1; the positioning mechanism 4 is used for the horizontal placement and positioning of the piston 6. Placing the piston 6 horizontally makes it easier to sink into the electroplating tank 5 and enables the electroplating solution to uniformly flow to the upper surface and the lower surface of the piston 6, that is, the left side and the right side after the piston 6 is horizontally placed.

[0029] It can be understood that first, the piston 6 is installed and positioned by the positioning mechanism 4, and the piston 6 is placed horizontally with its upper surface and lower surface on the left and right sides respectively. Then, the two pictorial anodes 1 are moved relatively closer by the opening and closing mechanism 3, and they are respectively inserted into the upper surface and lower surface of the piston 6 from the left and right sides, with a gap for the electroplating solution to flow between them. In addition, the pictorial anode 1 is connected to the positive pole of the power supply through a wire, the cathode assembly 2 passes through the through hole 101 on the pictorial anode 1, abuts against the piston 6, and is connected to the negative pole of the power supply through a wire.

[0030] In this embodiment, in order to fix the cathode assembly 2 on the pictorial anode 1 and directly abut against the piston 6 as the pictorial anode 1 opens and closes, the cathode assembly 2 includes an insulating bracket 21 and a cathode terminal 22. The insulating bracket 21 is fixedly installed inside the through hole 101 to block between the cathode terminal 22 and the pictorial anode 1. Among them, the cathode terminal 22 is arranged on one side of the insulating bracket 21. When the pictorial anode 1 is inserted into both sides of the piston 6 with a gap, the cathode terminal 22 just abuts against the piston 6. Moreover, by controlling the length of the cathode terminal 22, the gap interval can also be controlled.

[0031] It can be understood that when the opening and closing mechanism 3 drives the two pictorial anodes 1 to move, when the cathode terminal 22 just abuts against the piston 6, it plays a positioning role, indicating that the pictorial anode 1 has moved to the set position of the gap distance from the piston 6, thereby being able to achieve rapid positioning and control the gap effect.

[0032] Furthermore, a first wire 23 is connected to the cathode terminal 22, and the first wire 23 passes through the insulating bracket 21 for connecting to the negative pole of the power supply.

[0033] In this embodiment, in order to use the same length of cathode terminal 22 according to different spacing distances, the insulating bracket 21 includes a support frame 211 and a hollow cylinder 212. The support frame 211 is fixed inside the through hole 101, the hollow cylinder 212 is arranged at the axis of the support frame 211, and the length of the hollow cylinder 212 is adjusted according to the interval from the position where it abuts against the piston 6, and it passes through the support frame 211 from left to right, so that the position where the cathode terminal 22 is installed at its end has the same abutting distance from the piston 6. First, when the spacing is large, the cathode terminal 22 is moved away from the pictorial anode 1 to reduce possible interference. Second, to avoid manufacturing multiple specifications of cathode terminals 22, one end of the cathode terminal 22 is fixed to one end of the hollow cylinder 212, and the first wire 23 connected to the cathode terminal 22 passes through the insulating bracket 21 from inside the hollow cylinder 212 and is connected to the negative pole of the power supply.

[0034] It is understandable that the length of the first wire 23 is more easily adjustable. Therefore, when the cathode end 22 remains unchanged and the hollow cylinder 212 grows, only a longer first wire 23 is needed to meet the requirements.

[0035] Furthermore, a second wire 102 is arranged on the pictorial anode 1 for connecting to the positive pole of the power supply.

[0036] In this embodiment, in order to control the opening and closing of the two pictorial anodes 1, the opening and closing mechanism 3 includes an annular frame 31 and a telescopic mechanism 32. The number of the annular frame 31 and the telescopic mechanism 32 is two each. The movable ends of the two telescopic mechanisms 32 are respectively connected to the two annular frames 31. The pictorial anodes 1 are arranged inside the annular frames 31 in one-to-one correspondence. Among them, the annular frame 31 is an insulating bracket, and a connecting rod extends from its top for connecting to the telescopic end of the telescopic mechanism 32 to control the immersion of the pictorial anode 1 under the electroplating solution.

[0037] It is understandable that the telescopic mechanism 32 can adopt mature devices with linear driving functions such as hydraulic push rods, electric push rods or ball screw pairs, etc., and is not uniquely limited here.

[0038] In this embodiment, an electroplating tank 5 is further included. The opening and closing mechanism 3 and the positioning mechanism 4 are both installed on the electroplating tank 5.

[0039] Among them, the positioning mechanism 4 includes a sleeve 41. A sealing layer 42 is arranged inside the sleeve 41. By inserting the piston 6 into the sleeve 41, positioning is formed. Among them, the sleeve 41 is horizontally placed. When the piston 6 is inserted into it, the piston 6 is also horizontally positioned.

[0040] Furthermore, in order to shield the outer surface of the piston 6 when chromium plating is performed on the upper and lower surfaces of the piston 6, the sealing layer 42 includes at least two sealing rings 421 arranged inside the sleeve 41. The two sealing rings 421 are attached to the outer circular surface of the piston 6 and abutted against the left and right sides after it is horizontally placed to form the seal of its outer circle, preventing the electroplating solution from contacting the outer circle of the piston 6 and playing an isolating role.

[0041] Furthermore, in order to control the installation of the piston 6 above the electroplating liquid level and sink it into the electroplating solution for chromium plating after installation, the positioning mechanism 4 further includes a lifting assembly 43. The lifting assembly 43 is installed on the electroplating tank 5. The movable end of the lifting assembly 43 is connected to the sleeve 41 for driving the sleeve 41 to lift and lower in the electroplating tank 5, having a position state of lifting the sleeve 41 above the electroplating liquid level in the electroplating tank 5 and a position state of lowering the sleeve 41 below the electroplating liquid level in the electroplating tank 5.

[0042] It is understandable that the telescopic mechanism 32 can adopt mature devices with linear drive functions such as hydraulic push rods, electric push rods or ball screw pairs to perform linear drive in the vertical direction, so as to achieve lifting control, and no unique limitation is made here.

[0043] The specific working process of the present utility model: Place the piston 6 horizontally and insert it into the sleeve 41. Lower the piston 6 through the lifting assembly 43 and immerse it in the plating solution in the plating tank 5; then drive the annular frame 31 and the shaped anode 1 on the annular frame 31 to move through the telescopic mechanism 32. The two shaped anodes 1 approach each other and are respectively inserted into the left and right sides of the piston 6. Moreover, the cathode terminals 22 on them abut against both sides of the piston 6, so that there is a gap between the shaped anode 1 and both sides of the piston 6 to position its position; the cathode terminals 22 are connected to the negative electrode of the power supply through the first wire 23, and the shaped anode 1 is connected to the positive electrode of the power supply through the second wire 102 to perform chromium plating on the upper and lower surfaces of the piston 6.

[0044] After the entire working process is completed, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0045] The above is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present utility model should be covered by the protection scope of the present utility model.

Claims

1. A piston upper and lower surface chromium plating device, characterized in that, include: There are two pictographic anodes, which match the shapes of the upper and lower surfaces of the piston respectively, and are used to be inserted into the top and bottom of the piston with a gap between them. A through hole is opened on the central axis of the pictographic anode; Cathode assemblies, the number of which is two, the cathode assemblies correspondingly pass through the through holes one by one, and are used to abut against the top or bottom of the piston; An opening and closing mechanism has two movable ends, which are respectively connected to two pictographic anodes and are used to drive the two pictographic anodes to move toward or away from each other; as well as The positioning mechanism is used for the horizontal placement and positioning of the piston.

2. The piston upper and lower surface chromium plating device according to claim 1, characterized in that, The cathode assembly comprises an insulating support and a cathode terminal. The insulating support is arranged at the inner side of the through hole, and the cathode terminal is arranged at one side of the insulating support.

3. The piston upper and lower surface chromium plating device according to claim 2, wherein The cathode terminal is connected with a first wire, which passes through the insulating bracket and is used for connecting the negative pole of the power supply.

4. The piston upper and lower surface chromium plating device according to claim 3, characterized in that, The insulating bracket includes a support frame and a hollow cylinder, the support frame is fixed on the inner side of the through hole, the hollow cylinder is arranged at the axis of the support frame and penetrates the support frame from left to right, one end of the cathode terminal is fixed to one end of the hollow cylinder, and the first wire connected to the cathode terminal passes through the insulating bracket from the hollow cylinder.

5. The piston upper and lower surface chromium plating device according to claim 4, characterized in that The pictographic anode is provided with a second wire for connecting to the positive electrode of the power supply.

6. The piston upper and lower surface chromium plating device according to claim 5, characterized in that, The opening and closing mechanism comprises an annular frame and a telescopic mechanism. The number of the annular frame and the telescopic mechanism are both two. The movable ends of the two telescopic mechanisms are respectively connected to the two annular frames. The pictographic anodes are arranged one by one on the inner side of the annular frame.

7. The piston upper and lower surface chromium plating device according to claim 6, characterized in that, It also includes an electroplating tank, and the opening and closing mechanism and the positioning mechanism are both installed on the electroplating tank.

8. The piston upper and lower surface chromium plating device according to claim 7, characterized in that, The positioning mechanism comprises a sleeve, and a sealing layer is arranged on the inner side of the sleeve.

9. The piston upper and lower surface chromium plating device according to claim 8, characterized in that, The sealing layer includes at least two sealing rings arranged in the sleeve.

10. The piston upper and lower surface chromium plating device according to claim 9, characterized in that, The positioning mechanism also includes a lifting component, which is installed on the electroplating tank. The movable end of the lifting component is connected to the sleeve and is used to drive the sleeve to rise and fall in the electroplating tank.

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