Electrolytic polishing device for valve stem

Abstract

The utility model relates to electrolytic polishing device technical field, concretely is a kind of vehicle valve nozzle electrolytic polishing device, including machine body, electrolytic polishing cell is arranged on the inner wall of machine body, the upper setting has placing rack, bubble mechanism is arranged on the machine body, the bubble mechanism includes: side connecting groove, the side connecting groove is arranged in the side of electrolytic polishing cell, the inner wall of machine body is provided with air pump, the output end of air pump is provided with output pipe, one end of output pipe is fixedly connected in the output end of air pump, the other end of output pipe is fixedly connected with flexible pipe, the one end of flexible pipe away from output pipe is fixedly connected with hollow strip. The utility model is provided with bubble mechanism, and micro-bubble generator discharges small bubbles, mechanical stirring effect is generated to electrolyte in the ascending process of micro-bubble, accelerates the diffusion of metal ion to electrolyte main body, reduces the obstruction of current transmission, and the electrolyte updating speed of dead angle area is accelerated.

Description

Technical Field

[0001] This utility model relates to the technical field of electrolytic polishing devices, specifically an electrolytic polishing device for automotive valve stems. Background Technology

[0002] Electrolytic polishing equipment is a device that uses electrochemical reactions to perform fine processing on the surface of metal workpieces. Its main principle is to use the metal workpiece to be processed as the anode and an insoluble material (such as lead, graphite, stainless steel, etc.) as the cathode in a specific electrolyte. Under the condition of applying direct current, the micro-protrusions are removed by selective dissolution of the metal on the anode surface, so as to achieve a smooth, clean, and mirror-like surface.

[0003] While existing electropolishing technology is widely used for the fine treatment of metal surfaces such as stainless steel and titanium alloys, it has significant limitations when processing workpieces with complex structures or limited space, especially in parts with features such as internal holes, threads, and grooves, like automotive valve stems. Automotive valve stems typically have deep holes, steps, and internal threads. These areas have narrow fluid exchange spaces, making it difficult for the electrolyte to flow sufficiently. The current density distribution on the anode surface is extremely uneven, causing the polishing area to concentrate in open areas, while deep within the holes, in areas where the electrolyte stagnates, and in dead corners of the threads easily form electropolishing blind zones. This results in significant differences in surface roughness, localized residual passivation films, and incomplete polishing.

[0004] In view of this, we propose an electrolytic polishing device for automotive valve stems. Utility Model Content

[0005] The purpose of this utility model is to provide an electrolytic polishing device for automotive valve stems. This device solves the problems of uneven polishing and poor dead-angle processing ability in the inner hole, threads and dead corners of automotive valve stems due to the limited flow of electrolyte and uneven current distribution caused by existing electrolytic polishing technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution: An electrolytic polishing device for automotive valve stems includes a body with an electrolytic polishing tank on its inner wall and a mounting rack on the upper wall. The body also includes a bubble mechanism comprising a side connecting groove disposed on the side of the electrolytic polishing tank. An air pump is mounted on the inner wall of the body, and an output pipe is provided at the output end of the air pump. One end of the output pipe is fixedly connected to the output end of the air pump, and the other end is fixedly connected to a telescopic tube. A hollow strip is fixedly connected to the end of the telescopic tube away from the output pipe. A hollow disc is rotatably connected to the top of the hollow strip. Two microbubble generators are symmetrically arranged on the hollow disc, and the microbubble generators are inclined relative to the hollow disc. The output pipe, telescopic tube, hollow strip, and inner wall of the hollow disc are connected. A reciprocating mechanism is provided on the hollow strip to drive its reciprocating motion.

[0007] Preferably, the telescopic tube is an axially expandable metal corrugated tube, and the hollow strip and the hollow disc block are rotatably connected by bearings.

[0008] Preferably, the connection end between the output pipe and the telescopic pipe is provided with an annular sealing ring, and the air pump is a vortex type.

[0009] Preferably, the placement rack is a mesh structure made of corrosion-resistant plastic, and the bottom of the electrolytic polishing tank is provided with a drain outlet.

[0010] Preferably, the inner wall of the machine body is provided with a corrosion-resistant coating, and the microbubble generator is detachably connected to the hollow disc block by threads.

[0011] Preferably, the bottom of the air pump is provided with a shock-absorbing pad, and the side of the electrolytic polishing tank is provided with a transparent observation window.

[0012] Preferably, the reciprocating mechanism includes a connector, which is fixedly connected to the top of the hollow strip. A rigid rod and a reciprocating screw are rotatably connected to the inner wall of the side connecting groove. The outer wall of the rigid rod is slidably connected to the connector, and the reciprocating screw is threadedly connected to the inner wall of the connector. A drive motor is fixedly connected to the outer wall of the side connecting groove, and the output shaft of the drive motor is fixedly connected to the reciprocating screw.

[0013] By employing the above technical solution, this utility model provides an electrolytic polishing device for automotive valve stems. It possesses at least the following beneficial effects: This invention incorporates a bubble mechanism. The microbubble generator emits tiny bubbles, which mechanically stir the electrolyte as they rise, accelerating the diffusion of metal ions into the electrolyte bulk, reducing obstacles to current transmission, and speeding up electrolyte turnover in dead zones.

[0014] This invention incorporates a bubble mechanism. When the microbubble generator exhausts air, it generates a reaction force that drives the hollow disc block to rotate around the hollow strip. The microbubble generator's spray direction is a circumferential scan, allowing bubbles to enter dead angles that are difficult to reach with static spraying, such as grooves at different depths in the inner hole and at different angles of the thread. This ensures that all complex areas are covered by bubble disturbance, achieving a consistent polishing rate across all areas.

[0015] 3. This utility model incorporates a reciprocating mechanism, which, after the drive motor is started, enables continuous reciprocating motion of the hollow strip and microbubble generator. This reciprocating motion actively expands the coverage area. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the machine body in this utility model; Figure 3 This is a schematic diagram of the air pump in this utility model; Figure 4 This is a schematic diagram of the cross-section of the electrolytic polishing tank in this utility model; Figure 5 This is a schematic diagram of the reciprocating mechanism in this utility model; Figure 6 This is a schematic diagram of the microbubble generator in this utility model.

[0017] In the diagram: 1. Machine body; 2. Electrolytic polishing tank; 3. Placement rack; 4. Bubble mechanism; 41. Side connecting groove; 42. Air pump; 43. Output pipe; 44. Telescopic pipe; 45. Hollow strip; 46. Hollow disc block; 47. Microbubble generator; 5. Reciprocating mechanism; 51. Connector; 52. Rigid rod; 53. Reciprocating lead screw; 54. Drive motor. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1 - Figure 6As shown, this utility model provides a technical solution: an electrolytic polishing device for automotive valve stems, including a body 1, an electrolytic polishing pool 2 disposed on the inner wall of the body 1, a mounting rack 3 disposed on the rack, and a bubble mechanism 4 disposed on the body 1. The bubble mechanism 4 includes: a side connecting groove 41 disposed on the side of the electrolytic polishing pool 2; an air pump 42 disposed on the inner wall of the body 1; an output pipe 43 disposed at the output end of the air pump 42; one end of the output pipe 43 fixedly connected to the output end of the air pump 42; and a telescopic pipe 44 fixedly connected to the other end of the output pipe 43. A hollow strip 45 is fixedly connected to the end of the telescopic pipe 44 away from the output pipe 43. A hollow disc block 46 is rotatably connected to the top. Two microbubble generators 47 are symmetrically arranged on the hollow disc block 46. The microbubble generators 47 are inclined relative to the hollow disc block 46. The output pipe 43, telescopic pipe 44, hollow strip 45 and the inner wall of the hollow disc block 46 are connected. The valve to be polished is placed on the placement rack 3 of the electrolytic polishing tank 2 as the anode. Electrolyte is injected into the electrolytic polishing tank 2. After the power is turned on, the metal atoms on the surface of the anode valve lose electrons due to electrochemical action and dissolve into metal ions that enter the electrolyte. The microscopic protrusions on the metal surface dissolve faster than the depressions due to the higher current density, and the surface gradually becomes smooth and bright. The bubble mechanism 4 enhances the electropolishing effect through dynamic microbubble jetting. The specific process is as follows: the air pump 42 is started, and compressed air enters the hollow disc block 46 sequentially through the output pipe 43, the telescopic pipe 44, and the hollow strip 45; the compressed air is discharged through two inclined microbubble generators 47 on the hollow disc block 46, forming microbubbles. During the rise of the microbubbles, they generate a mechanical stirring effect on the electrolyte, accelerating the diffusion of metal ions into the main body of the electrolyte and avoiding excessively high local concentrations; the flow impact of the microbubbles can peel off reaction byproduct bubbles such as hydrogen gas attached to dead corner areas, reducing the obstruction of current transmission and making the current distribution more uniform; through bubble disturbance, the electrolyte renewal speed in the dead corner areas is accelerated, and fresh electrolyte containing sufficient oxide ions is continuously replenished to ensure the continuous progress of the anodic dissolution reaction.Because the microbubble generator 47 is tilted and not perpendicular to the hollow disc block 46, a reaction force is generated during exhaust, pushing the hollow disc block 46 to rotate around the hollow strip 45. The rotating microbubble generator 47 forms a dynamic and more uniformly covered microbubble flow field in the electrolytic polishing tank 2. Its functions include: when the hollow disc block 46 rotates, the spray direction of the microbubble generator 47 is a circumferential scan, and the bubbles can enter the dead corners that are difficult to reach by static spraying, such as the grooves with different depths of the inner hole and different angles of the thread, ensuring that all complex areas are covered by bubble disturbance; The jetting bubbles generate multi-directional flow impacts in the electrolytic polishing tank 2, forming a "collision-reflection" effect with the inner hole and thread structure of the valve nozzle. The flow direction of the electrolyte in the dead zone is more complex and not unidirectional, further breaking the local stagnation state. The dynamic coverage of the bubbles makes the current distribution on the valve nozzle surface, including the dead zone, more uniform, reducing local low current areas caused by bubble adhesion or electrolyte stagnation, and ultimately achieving the consistency of polishing rate in each area. A reciprocating mechanism 5 is provided on the hollow strip 45 to drive the hollow strip 45 to reciprocate.

[0020] In this embodiment, the telescopic tube 44 is an axially expandable metal bellows with an elastic protective sleeve on its outer wall to isolate electrolyte corrosion. The hollow strip 45 and the hollow disc block 46 are rotatably connected by a bearing. The outer ring of the bearing is fixed to the top of the hollow strip 45, and the inner ring is fixed to the center of the bottom surface of the hollow disc block 46. An annular sealing ring is provided at the connection end between the output tube 43 and the telescopic tube 44 to prevent compressed air leakage. The air pump 42 is a vortex type, and a manual flow regulating valve is provided at the air outlet to regulate the compressed air output. The placement rack 3 is a mesh structure made of corrosion-resistant plastic with elastic slots evenly distributed on its surface to fix the object to be thrown. The electrolytic polishing tank 2 has a drain outlet at the bottom, and a solenoid valve is installed at the drain outlet. The solenoid valve is electrically connected to the controller and is used to discharge waste electrolyte. The inner wall of the machine body 1 is covered with a corrosion-resistant coating. The surface of the coating is roughened to enhance the adhesion to the machine body 1. The microbubble generator 47 and the hollow disc block 46 are detachably connected by threads. The microbubble generator 47 can be disassembled and replaced separately. The bottom of the air pump 42 is equipped with a shock-absorbing pad made of rubber to absorb the vibration of the air pump 42 during operation. The side of the electrolytic polishing tank 2 is equipped with a transparent observation window made of electrolyte-resistant plastic to observe the polishing status of the valve in real time.

[0021] Furthermore, the reciprocating mechanism 5 includes a connector 51, which is fixedly connected to the top of the hollow strip 45. A rigid rod 52 and a reciprocating screw 53 are rotatably connected to the inner wall of the side connecting groove 41. The outer wall of the rigid rod 52 is slidably connected to the connector 51, and the reciprocating screw 53 is threadedly connected to the inner wall of the connector 51. A drive motor 54 is fixedly connected to the outer wall of the side connecting groove 41. The output shaft of the drive motor 54 is fixedly connected to the reciprocating screw 53. After the drive motor 54 is started, its output shaft drives the reciprocating screw 53 to rotate around its own axis. Since the reciprocating screw 53 is threadedly connected to the inner wall of the connector 51, and the connector 51 is simultaneously slidably connected to the rigid rod 52, which restricts the rotational freedom of the connector 51, the rotational motion of the reciprocating screw 53 is converted into linear motion of the connector 51 along the screw axis through the threaded pair. The connector 51 is fixed to the top of the hollow bar 45, so the linear motion of the connector 51 directly drives the hollow bar 45 to reciprocate along the extension direction of the side connecting groove 41, such as the vertical or horizontal direction, ultimately realizing the continuous reciprocating motion of the hollow bar 45 and the microbubble generator 47.

[0022] In the use of the electrolytic polishing device for automotive valve stems of this utility model, the valve stem to be polished is placed on the placement rack 3 of the electrolytic polishing tank 2 as the anode; an electrolyte is injected into the electrolytic polishing tank 2; after the power is turned on, the metal atoms on the surface of the anode valve stem lose electrons due to electrochemical action and dissolve into metal ions that enter the electrolyte; the microscopic protrusions on the metal surface dissolve faster than the depressions due to the higher current density, and the surface gradually becomes smooth and bright.

[0023] The bubble mechanism 4 enhances the electropolishing effect through dynamic microbubble jetting. First, the air pump 42 is started, and compressed air enters the hollow disc block 46 sequentially through the output pipe 43, the telescopic pipe 44, and the hollow strip 45. The compressed air is discharged through two inclined microbubble generators 47 on the hollow disc block 46, forming microbubbles. During the rise of the microbubbles, they generate a mechanical stirring effect on the electrolyte, accelerating the diffusion of metal ions into the main body of the electrolyte and avoiding excessively high local concentrations. The flow impact of the microbubbles can remove reaction byproduct bubbles such as hydrogen gas attached to dead corner areas, reducing the obstruction to current transmission and making the current distribution more uniform. Through bubble disturbance, the electrolyte renewal rate in dead corner areas is accelerated, and fresh electrolyte containing sufficient oxidizing ions is continuously replenished to ensure the continuous progress of the anodic dissolution reaction.

[0024] Because the microbubble generator 47 is tilted and not perpendicular to the hollow disc block 46, a reaction force is generated during exhaust, pushing the hollow disc block 46 to rotate around the hollow strip 45. The rotating microbubble generator 47 forms a dynamic and more uniformly covered microbubble flow field in the electrolytic polishing tank 2. Its functions include: when the hollow disc block 46 rotates, the spray direction of the microbubble generator 47 is a circumferential scan, and the bubbles can enter the dead corners that are difficult to reach by static spraying, such as the grooves of different depths of the inner hole and the different angles of the threads, ensuring that all complex areas are covered by bubble disturbance; the rotating sprayed bubbles generate multi-directional flow impact in the electrolytic polishing tank 2, forming a "collision-reflection" effect with the inner hole and thread structure of the valve, and the flow direction of the electrolyte in the dead corner area is more complex and not unidirectional, further breaking the local stagnation state; the dynamic coverage of bubbles makes the current distribution on the valve surface, including the dead corners, more uniform, reducing the local low current area caused by bubble adhesion or electrolyte stagnation, and finally achieving the consistency of polishing rate in each area.

[0025] After the drive motor 54 starts, its output shaft drives the reciprocating screw 53 to rotate around its own axis. Since the reciprocating screw 53 is threadedly connected to the inner wall of the connector 51, and the connector 51 is simultaneously slidably connected to the rigid rod 52, which restricts the rotational freedom of the connector 51, the rotational motion of the reciprocating screw 53 is converted into linear motion of the connector 51 along the screw axis through the threaded pair. The connector 51 is fixed to the top of the hollow bar 45, so the linear motion of the connector 51 directly drives the hollow bar 45 to reciprocate along the extension direction of the side connecting groove 41, such as the vertical or horizontal direction, ultimately realizing the continuous reciprocating motion of the hollow bar 45 and the microbubble generator 47. If only the rotational spray of the microbubble generator 47 is relied upon without reciprocating motion, the edge areas of large-sized workpieces, such as the end of the inner hole and the edge of the thread, may be too far from the generator, resulting in insufficient bubble disturbance. This leads to slow electrolyte mass transfer and accumulation of reaction byproducts such as hydrogen in this area, ultimately resulting in quality problems such as incomplete polishing, rough surface, or excessive corrosion and local depressions. Reciprocating motion can effectively avoid such defects by actively expanding the coverage area.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A valve inlet electrolytic polishing device for vehicle, comprising a machine body (1), characterized in that: An electrolytic polishing tank (2) is provided on the inner wall of the machine body (1), and a placement rack (3) is provided on the upper part of the machine body (1). A bubble mechanism (4) is provided on the machine body (1), and the bubble mechanism (4) includes: Side connection groove (41), the side connection groove (41) is set on the side of the electrolytic polishing tank (2), an air pump (42) is set on the inner wall of the machine body (1), an output pipe (43) is set at the output end of the air pump (42), one end of the output pipe (43) is fixedly connected to the output end of the air pump (42), the other end of the output pipe (43) is fixedly connected to a telescopic pipe (44), a hollow strip (45) is fixedly connected at the end of the telescopic pipe (44) away from the output pipe (43), a hollow disc block (46) is rotatably connected to the top of the hollow strip (45), two microbubble generators (47) are symmetrically arranged on the hollow disc block (46), the microbubble generators (47) and the hollow disc block (46) are inclined relative to each other, and the inner walls of the output pipe (43), telescopic pipe (44), hollow strip (45) and hollow disc block (46) are connected. The hollow bar (45) is provided with a reciprocating mechanism (5) for driving the hollow bar (45) to reciprocate.

2. The valve core electrolytic polishing device for vehicle as claimed in claim 1, characterized in that: The telescopic tube (44) is an axially telescopic metal corrugated tube, and the hollow strip (45) and the hollow disc block (46) are rotatably connected by bearings.

3. The valve stem tip electrolytic polishing apparatus for vehicle tires according to claim 1, wherein: The connection end of the output pipe (43) and the telescopic pipe (44) is provided with an annular sealing ring, and the air pump (42) is a vortex type.

4. The valve stem electrolytic polishing apparatus of claim 1, wherein: The placement rack (3) is a mesh structure made of corrosion-resistant plastic, and the bottom of the electrolytic polishing tank (2) is provided with a drain outlet.

5. The valve stem electrolytic polishing apparatus of claim 1, wherein: The inner wall of the body (1) is provided with a corrosion-resistant coating, and the microbubble generator (47) and the hollow disc block (46) are detachably connected by threads.

6. The valve stem electrolytic polishing apparatus of claim 1, wherein: The bottom of the air pump (42) is provided with a shock-absorbing pad, and the side of the electrolytic polishing tank (2) is provided with a transparent observation window.

7. The valve stem tip electrolytic polishing apparatus of claim 1, wherein: The reciprocating mechanism (5) includes a connector (51), which is fixedly connected to the top of the hollow strip (45). A rigid rod (52) and a reciprocating screw (53) are rotatably connected to the inner wall of the side connecting groove (41). The outer wall of the rigid rod (52) is slidably connected to the connector (51), and the reciprocating screw (53) is threadedly connected to the inner wall of the connector (51). A drive motor (54) is fixedly connected to the outer wall of the side connecting groove (41), and the output shaft of the drive motor (54) is fixedly connected to the reciprocating screw (53).

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