Open type electroplating roller, electroplating device and electroplating method

Abstract

The invention discloses an open type electroplating roller, an electroplating device and an electroplating method, and belongs to the technical field of electroplating devices.The electroplating roller comprises a roller body and a feeding and discharging port formed in the roller body, the two ends of the roller body are sealed, the cross section of the roller body is a volute line, and an inner cavity of the roller body forms a volute cavity; the feeding and discharging opening is formed in the outer side wall of the worm-shaped cavity, the feeding and discharging opening is formed in the final position when the worm-shaped line spirals outwards, when the barrel rotates circumferentially in the polar angle increasing direction of the worm-shaped line, overturning of workpieces in the worm-shaped cavity can be achieved, and when the barrel rotates circumferentially in the polar angle decreasing direction of the worm-shaped line, discharging of the workpieces can be achieved; the electroplating device disclosed by the invention comprises the electroplating roller; the electroplating method comprises the following steps: 1, putting a workpiece to be electroplated into the worm-shaped cavity through the feeding and discharging opening at the charging station; 2, the barrel is made to rotate circumferentially in the spiral line polar angle increasing direction at the electroplating station for electroplating; and 3, unloading is completed at an unloading station.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electroplating devices, and particularly relates to an open electroplating drum, an electroplating device and an electroplating method. BACKGROUND

[0002] The electroplating drum (also commonly referred to as a barrel plating drum) is the core equipment of the barrel plating process, and the design goal thereof is to make a large number of small parts uniformly tumble in the electroplating tank while ensuring that the current can smoothly pass through to achieve electroplating.

[0003] At present, the most common cross section of the drum is hexagonal (hexagonal prism), and there are also round and square drums, and the existing drum is usually provided with a transverse opening on the wall thereof, a cover is arranged at the opening, and the cover is fixed at the opening through a locking mechanism, and the cover is opened to load and unload during electroplating; the cover must be tightly sealed through the locking mechanism during electroplating to prevent the parts from leaking out; the drum is driven to rotate in the electroplating tank during electroplating, so that the internal parts continuously tumble to achieve uniform electroplating.

[0004] At present, the parts tumble along the wall of the drum during electroplating, and cannot be actively dispersed and accumulated or change the movement track, thus causing uneven tumbling of the parts and affecting the electroplating effect; in addition, the cover is opened through the locking mechanism to load and unload, which causes the whole process to be relatively troublesome. SUMMARY

[0005] The application solves the technical problems in the prior art, has simple structure, reasonable design and strong practicability.

[0006] To solve the above technical problems, the application adopts the technical scheme of an open electroplating drum, comprising: A drum body, both ends of the drum body are sealed, the cross section of the drum body is a worm line, the inner cavity of the drum body forms a worm cavity, and the shape number parameter b of the worm line increases in turn along with the increase of the polar angle of the worm line; A feeding and discharging port is arranged on the outer side wall of the worm cavity, and the feeding and discharging port is arranged at the terminal position of the worm line, so that the material in the worm cavity can be turned over when the drum body rotates in the circumferential direction along the increasing direction of the polar angle of the worm line, and the material in the worm cavity can be unloaded when the drum body rotates in the circumferential direction along the decreasing direction of the polar angle of the worm line.

[0007] Preferably, the worm line where the cross section of the worm cavity is located is connected by a plurality of circular arcs in turn.

[0008] Preferably, the worm line where the cross section of the worm cavity is located is connected by a plurality of straight lines in turn.

[0009] Preferably, the included angle between adjacent straight lines when the plurality of straight lines are connected in turn is 108°-160°.

[0010] Preferably, the degree of the polar angle θ corresponding to the cochlear line where the cochlear cavity cross section is located is: 5 / 2π < θ < 5π.

[0011] Preferably, the inner wall of the cochlear cavity is provided with anti-skid texture.

[0012] Preferably, the inlet and outlet port is provided with an outwardly inclined bevel.

[0013] Another technical solution adopted by the present application is an open type electroplating device, comprising a roller support, a power assembly is arranged on one side of the roller support, a transmission assembly connected with the power assembly, and further comprising an open type electroplating roller according to any one of claims 1-7, the open type electroplating roller is arranged on the inner side of the roller support, and the open type electroplating roller is driven by the transmission assembly.

[0014] The present application also adopts a technical solution, an open type electroplating method, using the electroplating device of the present application, comprising the following steps: Loading: at the loading station, the inlet and outlet port of the cylinder body is upward, and the workpieces to be electroplated are put into the cochlear cavity through the inlet and outlet port; Electroplating: moving the cylinder body to the electroplating station, making the cylinder body rotate along the direction of increasing polar angle of the cochlear line, the workpieces to be electroplated in the cylinder body fall down to realize the turnover of the workpieces under the guidance of the cochlear cavity, making the cylinder body continuously rotate in the direction until the electroplating is completed, and making the inlet and outlet port of the cylinder body upward when the electroplating is completed; Unloading: moving the cylinder body to the unloading station, making the cylinder body rotate along the direction of decreasing polar angle of the cochlear line to complete the unloading.

[0015] Compared with the prior art, the present application has the following advantages: 1. The open type electroplating roller of the present application, when the cylinder body rotates along the direction of increasing polar angle of the cochlear line, the materials are driven and climbed by the cylinder wall in the cochlear cavity, when the workpiece pile climbs to a limit position, the workpieces on the surface will lose balance first and start to slide down, the sliding of the workpieces on the surface will disturb the next layer, triggering a chain reaction, causing the workpieces to slide down like an "avalanche", this surface sliding process can efficiently expose the workpieces at the bottom to the surface layer by layer, realizing the depth mixing; therefore, through the unique cochlear line cross section design of the roller in the present application, the geometry structure of "high position lifting at small radius end and low position receiving at large radius end" is strengthened, ensuring that the workpieces produce sufficient displacement and turnover when falling, and finally the continuous cycle composed of "overall climbing" and "surface falling" makes all the workpieces be evenly turned over and fully exposed to the electrolyte, thereby obtaining high quality electroplating effect; 2.The open type electroplating drum, when rolling, the shape parameter b synchronously changes, the curvature radius of the cavity wall is continuously changed, which makes the lifting height and sliding track of the material in the cavity change continuously, the dynamic changing motion path breaks the "dead zone" or the whole sliding phenomenon of the material in the traditional drum, forces the material to roll and mix in multiple dimensions and irregularly, the mixing uniformity and the surface area update frequency of the material are greatly improved, and it is ensured that each workpiece can be fully and uniformly exposed to the electroplating solution, thereby effectively improving the uniformity of the electroplating coating and improving the product quality and production efficiency. 3.The open type electroplating drum, when the drum body rotates in the opposite direction of the increase of the polar angle of the worm line, the material lifted in the cavity slides to and gathers at the inlet and outlet port with the lowest position along the smooth and continuous worm cavity inner wall under the action of gravity, thereby completing rapid and complete automatic unloading, compared with the traditional drum which needs to be stopped and then the unloading port is opened to unload, the unloading mode realizes rapid and low-energy consumption unloading, and there is no residue in the unloading port cavity, which greatly improves the unloading efficiency and operation convenience.

[0016] The technical solutions of the present application will be further described in detail below with the help of the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of an open type electroplating drum device of the present application; Figure 2 FIG. 2 is an initial rotation state diagram of the open type electroplating drum of the present application; Figure 3 FIG. 3 is a state diagram of the open type electroplating drum of the present application when the material is turned over; Figure 4 FIG. 4 is a subsequent rotation state diagram of the open type electroplating drum of the present application after the material is turned over; Figure 5 FIG. 5 is an unloading state diagram of the open type electroplating drum of the present application; Figure 6 FIG. 6 is a structural schematic diagram of an open type electroplating drum device of the present application.

[0018] Explanation of reference signs: 1, drum body; 2, inlet and outlet port; 3, worm cavity; 4, transmission assembly; 5, drum support. DETAILED DESCRIPTION

[0019] As Figure 1 , Figure 2 and Figure 3As shown, the open type electroplating drum of the present application comprises a drum body 1 and an inlet and outlet port 2 arranged on the drum body 1, both ends of the drum body 1 are sealed, the cross section of the drum body 1 is a worm line, the inner cavity of the drum body 1 forms a worm cavity 3, and the shape number parameter b of the worm line increases along with the increase of the polar angle of the worm line; the inlet and outlet port 2 is arranged on the outer side wall of the worm cavity, and the inlet and outlet port 2 is arranged at the terminal position of the worm line, and when the drum body 1 rotates along the increasing direction of the polar angle of the worm line, the tumbling of the materials in the worm cavity 3 can be realized, and when the drum body 1 rotates along the decreasing direction of the polar angle of the worm line, the unloading of the materials in the worm cavity 3 can be realized.

[0020] The open type electroplating drum of the present application, the rotation speed of the drum body 1 is low during the electroplating process, so the effect of centrifugal force is not considered during the rotation of the drum, during the electroplating process, the whole workpiece stack is regarded as a whole, at this time, the bottom layer workpiece which is in contact with the drum wall and constitutes the workpiece stack is mainly subjected to the gravity, friction and the supporting force of the drum wall, when the electroplating starts, the drum body 1 rotates along the increasing direction of the polar angle of the worm line, so that all the materials in the drum body 1 enter the bottom inside of the drum body 1, and Figure 1 As shown, then the drum body 1 continues to rotate, at this time, the bottom layer workpiece is dragged by the static friction of the drum wall, the bottom layer workpiece is dragged at the same time, and the drag force is transmitted to the upper layer workpiece through the extrusion and friction between the workpieces, so that the workpiece stack climbs upward along the drum wall, during the process, the total drag force (the friction of the drum wall + the friction between the internal workpieces) and the component force of the total gravity along the drum wall direction are balanced; when the drum body 1 continues to rotate, the workpiece stack is lifted to a limit position, at this time, the component force of the gravity of the surface layer workpiece becomes the driving force which causes the workpiece to slide, when the driving force is greater than the static friction of the workpiece, the surface layer workpiece will lose balance first, and the sliding of the surface layer workpiece will disturb the next layer workpiece to cause a chain reaction, so that the workpieces slide downward like an “avalanche”, and the surface layer sliding process can efficiently expose the bottom workpiece to the surface layer by layer, and realizes the depth mixing; Figure 3 It is a schematic diagram of the workpiece tumbling state, Figure 4 It is a subsequent state diagram of the workpiece tumbling; therefore, through the unique worm line cross section design of the drum in the present application, through the geometric structure of “high position lifting at small radius end and low position receiving at large radius end”, the tumbling process is strengthened, and sufficient displacement and tumbling of the workpiece are ensured when the workpiece falls, and finally the continuous circulation composed of “overall climbing” and “surface layer tumbling” can make all the workpieces be evenly tumbled and fully exposed to the electrolyte, so that the high quality electroplating effect is obtained.

[0021] And the open type electroplating drum disclosed in the present application, when the barrel 1 rotates in the opposite direction of the increasing polar angle of the spiral line, the material lifted in the cavity will slide along the smooth and continuous inner wall of the spiral cavity to the lowest inlet and outlet under the action of gravity, thereby completing the automatic unloading quickly and thoroughly. Compared with the traditional drum which needs to be stopped and then the unloading port is opened for unloading, this unloading method realizes quick and low-energy unloading, and there is no residue in the unloading port cavity, greatly improving the unloading efficiency and operation convenience.

[0022] Further, the spiral line where the cross section of the spiral cavity 3 is located is connected by a plurality of circular arcs in sequence; the inner wall is arc-shaped and connected by the circular arcs in sequence; for the spiral cavity 3 with the arc-shaped inner wall formed by the plurality of circular arcs, the movement of the material on the wall is continuously changed due to the smooth transition of the circular arcs of the spiral cavity 3, which reduces the movement impact and makes the tumbling action of the workpiece more stable and controllable; for spherical, cylindrical and other workpieces, the arc-shaped inner wall provides a better contact surface, reducing the high stress concentration caused by point contact or line contact, thereby reducing the risk of scratching the plated layer, which is crucial for precision workpieces with high surface finish requirements; at the same time, the smooth inner wall makes the overall flow of the material more smooth, and it is easier to form a stable and predictable circulation path, which is beneficial to the stability of the electroplating process.

[0023] In another embodiment, the spiral cavity 3 is connected by a plurality of straight lines in sequence, and the included angle between adjacent straight lines is 108°-160°. At this time, the cross section of the spiral cavity 3 is approximated to the spiral line by a series of straight line segments (i.e. a polygon), which is equivalent to forming a regular or irregular polygon drum. In this case, when the material moves to the included angle (corner) between the two straight lines, the direction of the material will change suddenly, and this sudden change will effectively throw and scatter the material, resulting in very violent tumbling and mixing; at the same time, this strong tumbling ensures that no workpiece can hide in the corner for a long time, and each workpiece will be frequently thrown to the top and outside of the material pile to obtain sufficient electroplating opportunity, which is especially effective for workpieces that are prone to winding or sticking (such as springs and sheet-shaped parts); and compared with the machining of the arc-shaped spiral cavity 3, the machining process is relatively simple, which can greatly reduce the manufacturing cost of the barrel 1.

[0024] Further, the polar angle θ corresponding to the spiral line where the cross section of the spiral cavity 3 is located is: 5 / 2π < θ < 5π. The angle range is the number of turns of the spiral line where the cross section of the spiral cavity 3 is located; in this range, the cylinder 1 can provide enough falling points and long enough paths for the materials inside it, while ensuring compact structure and controllable cost. This range ensures that the internal space of the cylinder is used efficiently, and can accommodate an appropriate amount of material, neither too little (affecting efficiency) nor too much (leading to insufficient tumbling). If the number of turns is less than 5 / 2π, the "volute" shape feature of the spiral line is not obvious, and the lifting height and tumbling path of the internal material may be insufficient, and the effect will tend to be close to an improved polygonal cylinder, which cannot fully exert its advantages; or if the number of turns exceeds 5π, in addition to the dramatic increase in manufacturing cost, the extra turns have no contribution to lifting and tumbling, but increase the weight and moment of inertia. In actual electroplating operations, the appropriate number of turns can be selected within this range according to the size of the workpiece to be electroplated.

[0025] Further, the shape number parameter b corresponding to the spiral line where the cross section of the spiral cavity 3 is located is: 0.1 < b < 0.2. Because the shape number parameter b is a key factor in determining the opening speed of the spiral line; if b < 0.1, the interval is too narrow, the spiral line is tightly wound, the material may not be lifted high enough to be stuck or congested in the narrow passage, the tumbling action will become cramped and insufficient, and the material is prone to severe extrusion and friction in the narrow space, resulting in scratches, and the flow and exchange of electroplating liquid in the cavity will also be hindered; if b > 0.1, the interval is too wide, the spiral line opens too fast, and the material needs to rotate a long angle to be lifted a small height, which is inefficient, and even the large interval may cause the material to slide down too early before reaching the tumbling point, unable to be taken to a high enough position, which will make the tumbling weak and uncontrollable, and the mixing effect will be greatly reduced. When 0.1 < b < 0.2, the material can be smoothly and stably carried upward by the cylinder wall, with enough space to accelerate and move, and then the material can be lifted to a high enough position, and after reaching the highest point, the mechanical balance is broken, and the material can effectively tumble along a steep, inward path from a high enough position, thereby achieving full exposure and mixing of the workpiece.

[0026] Further, the shape number parameter b increases in turn along the outward rotating direction of the spiral line, which guides the workpiece to form a circular motion of "slowly climbing on the inside → accelerating lifting in the middle → dispersing sliding on the outside" in the cylinder through geometric constraints.

[0027] Further, the inner wall of the snail-shaped cavity 3 is provided with anti-skid texture. The design of the inner wall anti-skid texture enables the material to move stably with the cylinder wall during the climbing process, reduces unnecessary relative sliding and back rolling, and makes the lifting process more efficient and controllable; and due to the increase of friction, it may not be necessary to achieve effective material lifting at a very high speed. This helps to reduce energy consumption and reduce the risk of severe collision caused by high centrifugal force.

[0028] Further, as shown in Figure 5 , the inlet and outlet port 2 is provided with an outwardly inclined inclined port; when the drum is reversed to discharge the material, the material is collected to the material port, and the outwardly inclined slope forms a natural slide, at this time the gravity will automatically guide the material to the lowest point of the inclined port and smoothly slide out, greatly promoting the flow of the material, avoiding the accumulation of the material at the edge of the material port.

[0029] An open type electroplating device, as shown in Figure 6 , includes a drum support 5, the cylinder body 1 is rotatably arranged in the middle of the drum support 5, and a motor for driving is further arranged on one side of the drum support 5. The motor is connected with the cylinder body 1 through a transmission assembly 4 to drive the cylinder body 1 to rotate. The transmission assembly 4 is arranged between the output shaft of the motor and the cylinder body 1. When the motor rotates, the cylinder body 1 can be driven to rotate through the transmission assembly 4. In order to determine the rotation angle of the cylinder body 1 to identify the specific position of the inlet and outlet port 2 of the cylinder body 1, a sensing sheet corresponding to the position of the inlet and outlet port is arranged on the transmission assembly 4 which is linked with the cylinder body 1. A proximity switch is arranged on the outer support or protective cover and connected with the control system. When the transmission assembly 4 drives the cylinder body 1 to rotate, the sensing sheet also rotates with the cylinder body 1. The proximity switch can determine the position of the inlet and outlet port 2 on the cylinder body 1 by detecting whether the sensing sheet is close or not. When the proximity switch transmits the signal to the control system, the control system is used to control the start and stop of the motor. That is, when the drum is transported to the electroplating station and the motor starts, or before the electroplating is completed and the drum is transported, the proximity switch detects the position of the sensing sheet to ensure that the inlet and outlet port 2 of the drum is in a horizontal state.

[0030] An open type electroplating method using the electroplating device described above, characterized in that it comprises the following steps: Loading: at the loading station, the inlet and outlet port 2 of the cylinder body 1 is upward, and the workpiece to be electroplated is put into the snail-shaped cavity 3 through the inlet and outlet port 2; Electroplating: move the cylinder body 1 to the electroplating station, and make the cylinder body 1 rotate along the circumferential direction of the snail-shaped line with increasing polar angle. The workpiece to be electroplated in the cylinder body 1 falls to realize material turning under the guidance of the snail-shaped cavity 3, and the cylinder body 1 continues to rotate in this direction until the electroplating is completed. At the end of the electroplating, the inlet and outlet port 2 of the cylinder body 1 is upward through the proximity switch and the control system. Discharging: the barrel 1 is moved to a discharging station, and the barrel 1 is circumferentially rotated along the direction of the decreasing polar angle of the worm line, so as to complete discharging.

[0031] The above is only the preferred embodiment of the present application, and does not limit the present application. Any simple modification, change and equivalent structural change of the above embodiment according to the technical essence of the present application are still within the protection scope of the technical solution of the present application.

Claims

1. An open-type electroplating roller, characterized in that, include: The cylinder (1) is sealed at both ends. The cross-section of the cylinder (1) is a spiral line. The inner cavity of the cylinder (1) forms a spiral cavity (3). The shape parameter b of the spiral line increases sequentially as the polar angle of the spiral line increases. The inlet and outlet (2) are located on the outer wall of the volute cavity (3) and the inlet and outlet (2) are located at the end point of the volute. When the cylinder (1) rotates in a circle along the direction of increasing polar angle of the volute, the material inside the volute cavity (3) can be turned over. When the cylinder (1) rotates in a circle along the direction of decreasing polar angle of the volute, the material inside the volute cavity (3) can be unloaded.

2. An open-type electroplating roller according to claim 1, characterized in that, The spiral line of the cross-section of the spiral cavity (3) is composed of multiple circular arcs connected in sequence.

3. An open-type electroplating roller according to claim 1, characterized in that, The spiral line of the cross-section of the spiral cavity (3) is composed of multiple straight lines connected in sequence.

4. An open-type electroplating roller according to claim 3, characterized in that, When multiple straight lines are connected in sequence, the included angle between adjacent straight lines is 108°-160°.

5. An open-type electroplating roller according to claim 2 or 3, characterized in that, The polar angle θ corresponding to the cross-section of the spiral cavity (3) is: 5 / 2π < θ < 5π.

6. An open-type electroplating roller according to claim 1, characterized in that, The inner wall of the snail-shaped cavity (3) is provided with anti-slip texture.

7. An open-type electroplating roller according to claim 1, characterized in that, The inlet and outlet (2) are set as an inclined opening that slopes outward.

8. An open-type electroplating apparatus, comprising a roller support (5), a power assembly disposed on one side of the roller support (5), and a transmission assembly (4) connected to the power assembly, characterized in that, It also includes an open electroplating roller as described in any one of claims 1-7 above, wherein the open electroplating roller is disposed inside the roller support (5) and the open electroplating roller is driven by the transmission assembly (4).

9. An open-type electroplating method using the electroplating apparatus of claim 8, characterized in that, Includes the following steps: Loading: At the loading station, the inlet and outlet (2) on the cylinder (1) are facing upwards, and the workpiece to be electroplated is placed into the volute cavity (3) through the inlet and outlet (2); Electroplating: Move the cylinder (1) to the electroplating station and make the cylinder (1) rotate circumferentially along the direction of increasing volute polar angle. During electroplating, the workpiece to be electroplated in the cylinder (1) falls under the guidance of the volute cavity (3) to achieve material turnover. Make the cylinder (1) continue to rotate in this direction until the electroplating is completed. When the electroplating is completed, make the inlet and outlet (2) of the cylinder (1) face upward. Unloading: Move the cylinder (1) to the unloading station and make the cylinder (1) rotate in a circle along the direction of decreasing volute polar angle to complete the unloading.

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