Tubular workpiece chromium plating line

Abstract

The present application belongs to the technical field of electroplating equipment, and discloses a tubular workpiece chromium plating line, which comprises a plating tank, a feeding and discharging conveying line, a rotating hanger, a line changing assembly and a transfer assembly, a plurality of plating tanks are arranged in parallel to form a plurality of electroplating stations; the feeding and discharging conveying line is located below one side of each electroplating station and is used for inputting workpieces to be plated and outputting plated workpieces; the rotating hanger is used for loading the workpieces to be plated on the feeding and discharging conveying line and keeping the workpieces to be plated horizontal and rotatable; the line changing assembly is used for driving the rotating hanger to switch between the height of the feeding and discharging conveying line and the height of the electroplating station; and the transfer assembly is used for driving the rotating hanger to circulate between the line changing assembly and each electroplating station, so that the workpieces to be plated are electroplated in the corresponding plating tank. The present application realizes the automatic feeding and discharging of tubular workpieces, the circulation between multiple electroplating stations and the action of moving in and out of the plating tank, and meets the high-quality chromium plating demand of tubular workpieces.

Description

Technical Field

[0001] This invention relates to the field of electroplating equipment technology, and more particularly to a chromium plating wire for tubular workpieces. Background Technology

[0002] With the development of industrial production, electroplating technology has been widely used in the field of metal surface treatment, such as chrome plating of tubular workpieces, which plays an important role in improving the surface hardness, wear resistance, and corrosion resistance of the workpieces. Currently, commonly used electroplating equipment in industrial production mainly includes plating tanks, conveying mechanisms, and electroplating racks. Workpiece transfer is achieved by driving the electroplating racks to move. For batch chrome plating of tubular workpieces, the relatively long length of the tubular workpieces places higher demands on the design of the electroplating racks and conveying mechanisms.

[0003] Traditional electroplating fixtures typically use a vertical suspension method to fix the workpiece and drive it to rotate vertically as needed. This suspension method makes tubular workpieces prone to swaying during transfer, affecting the accurate flow of the workpiece between different processes. This is especially problematic when moving the workpiece into and out of the plating tank, requiring high-performance conveying mechanisms with large travel distances and low efficiency. Furthermore, during electroplating, particularly when rotating, the unstable center of gravity of the suspended workpiece can cause it to swing eccentrically, resulting in uneven contact between the workpiece surface and the plating solution. This ultimately leads to inconsistent plating thickness and affects the overall plating quality.

[0004] Therefore, there is an urgent need for a chromium plating equipment specifically designed for tubular workpieces. Summary of the Invention

[0005] Based on the above problems, the purpose of this invention is to provide a chromium plating wire for tubular workpieces, which eliminates the drawbacks of existing hangers using a vertical suspension method, realizes stable clamping and efficient transfer of tubular workpieces, and improves processing efficiency and plating quality.

[0006] To achieve this objective, the present invention adopts the following technical solution: A chromium plating line for tubular workpieces includes a plating tank, a loading and unloading conveyor line, a rotary fixture, a line changing assembly, and a transfer assembly, wherein: Several plating tanks are arranged in parallel to form several electroplating stations; The loading and unloading conveyor line is located below one side of each electroplating station. The loading and unloading conveyor line is used to input the workpiece to be plated and output the plated workpiece. Rotary hangers are used to load workpieces to be plated on loading and unloading conveyor lines, and to keep the workpieces horizontal and able to rotate. The line-changing assembly is used to drive the rotating fixture to switch between the height of the loading / unloading conveyor line and the height of the electroplating station. The transfer assembly is used to drive the rotating fixture to move between the line changing assembly and each electroplating station, so that the workpiece to be plated can be electroplated in the corresponding plating tank.

[0007] As an optional solution, the rotating fixture includes a main support frame with two vertically downward extending support frames. Each support frame has several rotatable mounting seats, which are connected by a transmission component to achieve linkage. The mounting seats on the two support frames are arranged one-to-one. One end of the workpiece to be plated is fixed by the mounting seat of one support frame, and the other end of the workpiece to be plated is fixed by the mounting seat of the other support frame.

[0008] As an optional solution, the mounting seats are vertically spaced on the support frame, so that the workpieces to be plated are vertically clamped side by side. The transmission assembly includes several transmission gears, and each mounting seat has a transmission gear on its rotating shaft. Adjacent transmission gears cooperate to drive each other. A drive motor is mounted on the main support, and a linkage rod is mounted on the output end of the drive motor. The linkage rod is rotatably mounted on the main support and is arranged parallel to the rotating shaft of the mounting seat. A drive gear is mounted on the linkage rod and meshes with one of the transmission gears. A driven gear is mounted between the transmission gears of two adjacent mounting seats and meshes with both transmission gears simultaneously, so that the workpieces to be plated rotate synchronously and in the same direction.

[0009] As an optional solution, the main support is provided with two parallel crossbeams, and the top of the support frame is provided with two claw arms, which are hooked onto the two crossbeams respectively. The main support is an insulator, while the support frame and the mounting base are both conductors. The two ends of the crossbeams are provided with cathode conductive heads, and the surface of the crossbeams is provided with conductive strips that are connected to the cathode conductive heads and in contact with the claw arms.

[0010] As an alternative, the line changing assembly includes a vertical frame set on one side of the loading and unloading conveyor line, with two synchronously lifting and moving support seats on the vertical frame, each of which supports two cathode conductive heads.

[0011] As an alternative, a frame is installed above each electroplating station, and a traveling track is installed on the frame extending from above the line changing assembly to above each electroplating station. The transfer assembly can move along the traveling track. The transfer assembly includes a trolley frame, on which a lifting boom that can be raised and lowered is installed. Several hooks are installed on the boom, and several trolley lifting parts for hooking are installed on the top of the rotating fixture.

[0012] As an alternative, the crane lifting section has horizontal columns on both sides and V-shaped blocks on the hook. The V-shaped blocks provide a lower limit for the horizontal columns, and the horizontal columns can be disengaged from the top opening of the V-shaped blocks.

[0013] As an optional solution, a drip tray is provided at the bottom of the overhead crane frame. The drip tray can switch between a first position and a second position. When the drip tray is in the first position, it is located directly below the rotating fixture to catch the electroplating solution dripping from the workpiece after plating. When the drip tray is in the second position, it is offset from directly below the rotating fixture to avoid the lifting and lowering path of the rotating fixture.

[0014] As an alternative, the bottom of the gantry frame is provided with transversely arranged channel steel, and the liquid receiving tray is provided with a hanging wheel. The hanging wheel is arranged to roll in the channel steel, so that the liquid receiving tray can move horizontally. The gantry frame is provided with a shift gear, and the liquid receiving tray is provided with a transmission rack that cooperates with the shift gear.

[0015] As an alternative, a buffer rack is provided on the movement path of the transfer component. The buffer rack is used to temporarily store the rotating fixture loaded with the workpiece to be plated or the workpiece after plating.

[0016] The beneficial effects of this invention are: This chromium plating line for tubular workpieces achieves automated loading and unloading, transfer between multiple electroplating stations, and movement into and out of plating tanks through the coordinated operation of loading and unloading conveyors, rotating fixtures, line changing components, and transfer components. The rotating fixture keeps the tubular workpiece in a horizontal position, avoiding the swaying and eccentric swinging problems caused by traditional vertical suspension methods. It also facilitates stable driving of the rotating fixture and tubular workpiece by the line changing and transfer components, which helps to improve overall processing efficiency. In addition, by driving the tubular workpiece to rotate, it ensures uniform contact between the electroplating solution and the surface of the tubular workpiece, which significantly improves the uniformity of the plating thickness and the electroplating quality, meeting the high-quality chromium plating requirements of tubular workpieces. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the chromium plating wire for the tubular workpiece provided in an embodiment of the present invention; Figure 2 This is a front view of the rotating fixture in the chrome plating line of the tubular workpiece provided in an embodiment of the present invention; Figure 3 This is a side view of the rotating fixture in the chrome plating line of the tubular workpiece provided in an embodiment of the present invention; Figure 4 This is an enlarged view of the end of the rotating fixture in the chrome plating line of the tubular workpiece provided in the embodiment of the present invention; Figure 5 This is a schematic diagram of the wire-changing assembly in the chromium plating line for tubular workpieces provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the transfer assembly in the chromium plating line for tubular workpieces provided in an embodiment of the present invention.

[0018] In the attached image: 1. Plating bath; 2. Loading and unloading conveyor line; 3. Rotating hanger; 301. Main bracket; 302. Support frame; 303. Mounting base; 304. Transmission gear; 305. Drive motor; 306. Driven gear; 307. Crossbeam; 308. Claw arm; 309. Cathode conductive head; 310. Conductive strip; 311. Overhead crane hoisting unit; 312. Horizontal column; 4. Cable replacement assembly; 401. Vertical support frame; 402. Support base; 5. Transfer assembly; 501. Frame; 502. Traveling rail; 503. Overhead crane frame; 504. Boom; 505. Hook; 506. V-shaped support block; 507. Liquid receiving tray; 508. Channel steel; 509. Hanging wheel; 510. Shift gear; 511. Transmission rack; 6. Cache rack. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "on the upper side," and "over" the second feature include the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature include the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] To address the problem that existing electroplating fixtures and production lines are prone to shaking during clamping and transfer of tubular workpieces, which affects processing efficiency and plating quality, this embodiment provides a chromium plating line for tubular workpieces. Specifically, it adopts a horizontal clamping method, and works in conjunction with the line changing component 4 and the transfer component 5 to achieve stable clamping, efficient transfer, and uniform electroplating of tubular workpieces.

[0024] like Figures 1 to 6 As shown, the chrome plating line for the tubular workpiece includes a plating tank 1, a loading and unloading conveyor line 2, a rotating fixture 3, a line changing assembly 4, and a transfer assembly 5, wherein: Several plating tanks 1 are arranged in parallel to form several electroplating stations; The loading and unloading conveyor line 2 is located below one side of each electroplating station. The loading and unloading conveyor line 2 is used to input the workpiece to be plated and output the plated workpiece. The rotating hanger 3 is used to load the workpiece to be plated on the loading and unloading conveyor line 2, and to keep the workpiece to be plated horizontal and able to rotate. The line changing component 4 is used to drive the rotating fixture 3 to switch between the height of the loading / unloading conveyor line 2 and the height of the electroplating station. The transfer component 5 is used to drive the rotating fixture 3 to move between the line changing component 4 and each electroplating station, so that the workpiece to be plated can be electroplated in the corresponding plating tank 1.

[0025] Thus, through the coordinated operation of the loading and unloading conveyor line 2, the rotating fixture 3, the line changing assembly 4, and the transfer assembly 5, the automated loading and unloading of tubular workpieces, the transfer between multiple electroplating stations, and the movement into and out of the plating tank 1 are realized. The rotating fixture 3 keeps the tubular workpiece in a horizontal position, avoiding the swaying and eccentric swinging problems caused by the traditional vertical suspension method. It also facilitates the stable driving of the rotating fixture 3 and the tubular workpiece by the line changing assembly 4 and the transfer assembly 5, which is conducive to improving the overall processing efficiency. In addition, by driving the tubular workpiece to rotate, it ensures uniform contact between the electroplating solution and the surface of the tubular workpiece, which significantly improves the uniformity of the plating thickness and the electroplating quality, and meets the high-quality chromium plating requirements of tubular workpieces.

[0026] The loading and unloading conveyor line 2 is designed separately from the electroplating station to facilitate the uninterrupted loading and unloading of other tubular workpieces while some tubular workpieces are being electroplated or transferred. Depending on some process requirements, a tubular workpiece may need to be transferred sequentially in multiple plating tanks 1 to complete multiple electroplating steps, or multiple tubular workpieces may be electroplated simultaneously in their respective plating tanks 1. Multiple loading and unloading conveyor lines 2 can be set up according to the available space. One loading and unloading conveyor line 2 can be used for both loading and unloading, or the loading and unloading conveyor lines 2 can be set up separately for loading and unloading, to adapt to different production cycle requirements.

[0027] In at least one embodiment, see details. Figures 2 to 4The rotating fixture 3 includes a main support 301, on which two vertically downward extending support frames 302 are provided. Each support frame 302 is provided with several rotatable mounting seats 303. The mounting seats 303 are connected to each other through a transmission component to achieve linkage. The mounting seats 303 on the two support frames 302 are arranged opposite to each other and correspond one to one. One end of the workpiece to be plated is fixed by the mounting seat 303 of one support frame 302, and the other end of the workpiece to be plated is fixed by the mounting seat 303 of the other support frame 302.

[0028] Therefore, by clamping and fixing the two ends of the tubular workpiece with the mounting base 303 on the two side support frames 302 and driving it to rotate horizontally, the posture of the tubular workpiece during the electroplating process is stabilized and the uniform rotation requirement is met. This effectively avoids the swaying and eccentric swinging problems that are easy to occur in the vertical suspension method, and ensures that the surface of the tubular workpiece is in full and uniform contact with the electroplating solution, and the consistency of the coating thickness is significantly improved.

[0029] Optionally, the mounting seats 303 are vertically spaced on the support frame 302, so that the workpieces to be plated are vertically clamped side by side. The transmission assembly includes several transmission gears 304. Each mounting seat 303 has a transmission gear 304 on its rotating shaft. Adjacent transmission gears 304 cooperate to drive each other. A drive motor 305 is provided on the main bracket 301. A linkage rod is provided at the output end of the drive motor 305. The linkage rod is rotatably mounted on the main bracket 301 and is arranged parallel to the rotating shaft of the mounting seat 303. A drive gear is provided on the linkage rod. The drive gear meshes with one of the transmission gears 304. A driven gear 306 is provided between the transmission gears 304 of two adjacent mounting seats 303. The driven gear 306 meshes with two transmission gears 304 at the same time, so that the workpieces to be plated rotate synchronously and in the same direction.

[0030] The drive motor 305 rotates the driving gear on the linkage rod, which in turn drives the meshing transmission gear 304 to rotate. The transmission gear 304 is connected in sequence through the driven gear 306, thereby linking all the mounting seats 303 and driving multiple tubular workpieces to rotate. The alternating meshing arrangement of the transmission gear 304 and the driven gear 306 allows a single drive motor 305 to drive the entire row of mounting seats 303 and tubular workpieces to rotate synchronously and in the same direction. The transmission structure is compact and the power transmission is stable and reliable, effectively ensuring the consistency of electroplating conditions for each tubular workpiece. At the same time, the vertical parallel clamping method makes full use of vertical space, allowing a single rotating fixture 3 to carry multiple tubular workpieces for batch processing at the same time, significantly improving the production capacity per unit time.

[0031] Furthermore, a first sprocket is provided on the output shaft of the drive motor 305, and a second sprocket is provided on the linkage rod. The first sprocket and the second sprocket are connected by a chain, and the axial position of the drive gear on the linkage rod is adjustable.

[0032] Chain drive features buffering, vibration absorption, and overload protection, and can stably transmit driving power to the linkage rod; while the adjustable axial position of the drive gear allows it to be adjusted according to the position of the transmission gear 304 on the support frame 302 to adapt to tubular workpieces of different specifications and ensure meshing.

[0033] Specifically, the mounting base 303 includes a fixed part and a movable part, each of which is provided with a semi-circular cavity. The fixed part and the movable part are detachably connected, and the end of the tubular workpiece is clamped when the fixed part and the movable part are combined.

[0034] The design of the two semi-circular cavities matches the circular cross-section of the tubular workpiece, providing uniform clamping force after combination and avoiding localized stress concentration and deformation caused by point or line contact. The detachable connection between the fixed and movable parts facilitates quick clamping and unclamping of the workpiece, typically achieved through bolt connections, snap-fit ​​connections, or quick clamps. During clamping, the end of the tubular workpiece is first placed in the semi-circular cavity of the fixed part, and then the movable part is closed and secured with the connector to achieve reliable clamping. Based on the structure of the mounting base 303, in this embodiment, the workpiece to be plated is manually clamped during the process of being mounted on the rotating hanger 3 from the loading / unloading conveyor; however, if cost permits, an automatic clamping mechanism can also be designed to achieve fully automated operation.

[0035] Optionally, the main support 301 is provided with two parallel crossbeams 307, and the top of the support frame 302 is provided with two claw arms 308, which are hooked onto the two crossbeams 307 respectively. The main support 301 is an insulator, while the support frame 302 and the mounting base 303 are both conductors. The two ends of the crossbeams 307 are provided with cathode conductive heads 309, and the surface of the crossbeams 307 is provided with conductive strips 310 that are connected to the cathode conductive heads 309 and in contact with the claw arms 308.

[0036] The support frame 302 is connected to the main support 301 through the hook-and-loop engagement of the claw arm 308 and the crossbeam 307. Simultaneously, the contact between the claw arm 308 and the conductive strip 310 ensures that the cathode current is transmitted from the crossbeam 307 through the conductive strip 310, claw arm 308, and support frame 302 to the mounting base 303 and the tubular workpiece, forming a complete conductive path. The main support 301 is made of insulating material, effectively isolating live parts and improving operational safety; while the support frame 302 and mounting base 303 are made of conductive material, ensuring efficient current conduction and contributing to a good electroplating effect.

[0037] Furthermore, at least one support frame 302 can move along the conductive strip 310, making the spacing between the two support frames 302 adjustable.

[0038] This design allows the rotating fixture 3 to accommodate tubular workpieces of varying lengths. Spacing adjustment can be achieved manually with a locking mechanism, or automatically via electric or pneumatic drive. Once adjusted, the support frame 302 should be fixed in its current position using a locking device to prevent displacement during electroplating. Reliable sliding electrical contact should be maintained between the claw arm 308 of the support frame 302 and the conductive strip 310, typically achieved using a flexible brush, rolling wheel, or elastic clamp.

[0039] In at least one embodiment, see details. Figure 5 The line changing assembly 4 includes a vertical frame 401 set on one side of the loading and unloading conveyor line 2. The vertical frame 401 is provided with two synchronously lifting and moving support seats 402, and the two support seats 402 support the two cathode conductive heads 309 respectively.

[0040] The rotating fixture 3's cathode conductive head 309 is supported by the support base 402, which drives its overall lifting and moving movement, enabling rapid switching between the height of the loading / unloading conveyor line 2 and the electroplating station. The synchronous movement of the two support bases 402 ensures the stability of the rotating fixture 3's lifting process, avoiding tilting or swaying caused by the height difference at both ends, and providing stable working conditions for the subsequent loading and unloading of the rotating fixture 3 by the transfer assembly 5.

[0041] In at least one embodiment, see details. Figure 6 A frame 501 is installed above each electroplating station. A traveling track 502 is installed on the frame 501, extending from above the line changing assembly 4 to above each electroplating station. The transfer assembly 5 can move along the traveling track 502. The transfer assembly 5 includes a trolley frame 503. A lifting arm 504 that can be raised and lowered is installed on the trolley frame 503. Several hooks 505 are installed on the lifting arm 504. Several trolley lifting parts 311 for hooking by the hooks 505 are installed on the top of the rotating hanger 3.

[0042] The transfer assembly 5 moves back and forth along the travel track 502 between the line-changing assembly 4 and each electroplating station. Through the lifting action of the boom 504 and the hooking action of the hook 505 with the overhead crane hoisting part 311, the precise transfer of the rotating hanger 3 and tubular workpieces between different stations and the transfer into and out of the plating tank 1 are realized. The arrangement of the frame 501 and the travel track 502 makes full use of the space above the electroplating station, so that the transfer path does not interfere with key equipment such as the loading and unloading conveyor line 2 and the plating tank 1. The layout is reasonable and compact, which helps to shorten the transfer stroke and improve the flow efficiency.

[0043] Furthermore, the crane hoisting section 311 has horizontal columns 312 on both sides, and the hook 505 has a V-shaped support block 506. The V-shaped support block 506 forms a lower limit on the horizontal column 312, and the horizontal column 312 can be dislodged from the top opening of the V-shaped support block 506.

[0044] The V-shaped support block 506 provides a lower limit for the horizontal column 312, ensuring reliable suspension support for the rotating hanger 3 during the transfer process. The guiding characteristics of the V-shaped structure facilitate the rapid alignment and insertion of the horizontal column 312, while the top opening design allows the horizontal column 312 to easily detach when the boom 504 descends or deviates, enabling rapid separation of the rotating hanger 3 from the transfer assembly 5. This hook-and-loop connection method is simple in structure and reliable in operation, ensuring stability during the transfer process while meeting the requirements for rapid loading and unloading.

[0045] Optionally, a drip tray 507 is provided at the bottom of the overhead crane 503. The drip tray 507 can switch between a first position and a second position. When the drip tray 507 is in the first position, it is located directly below the rotating hanger 3 to receive the electroplating solution dripping from the plated workpiece. When the drip tray 507 is in the second position, it is offset from directly below the rotating hanger 3 to avoid the lifting and lowering path of the rotating hanger 3.

[0046] Considering that residual electroplating solution will drip from the workpiece after it is removed from plating tank 1, and that this dripping into other plating tanks 1 would affect the purity of the electroplating solution, the drip tray 507 can collect the dripping electroplating solution during the subsequent transfer of the workpiece. This effectively avoids pollution of the equipment and the surrounding environment by the electroplating solution. At the same time, the recovered electroplating solution can be centrally processed, reducing material loss and environmental treatment costs. When it is necessary to raise or rotate the hanger 3, the drip tray 507 switches to a second position to avoid the movement path, ensuring smooth operation.

[0047] Furthermore, the bottom of the traveling frame 503 is provided with a transversely arranged channel steel 508, and the liquid receiving tray 507 is provided with a hanging wheel 509. The hanging wheel 509 is arranged to roll in the channel steel 508, so that the liquid receiving tray 507 can move horizontally. The traveling frame 503 is provided with a shift gear 510, and the liquid receiving tray 507 is provided with a transmission rack 511 that cooperates with the shift gear 510.

[0048] The liquid receiving tray 507 achieves low-friction and smooth movement through the rolling engagement of the hanging wheel 509 and the channel steel 508. The meshing transmission of the shift gear 510 and the transmission rack 511 provides precise displacement control and reliable positioning, enabling the liquid receiving tray 507 to switch quickly and accurately between the first position and the second position, thus easily realizing the position switching of the liquid receiving tray 507.

[0049] In addition, a buffer rack 6 is provided on the moving path of the transfer component 5. The buffer rack 6 is used to temporarily store the rotating fixture 3 loaded with the workpiece to be plated or the workpiece after plating.

[0050] The buffer rack 6 provides necessary buffering capacity for the chrome plating line of tubular workpieces. When a certain electroplating station is temporarily unable to receive the rotating fixture 3 due to process adjustment, equipment maintenance or replacement of plating tank 1, the rotating fixture 3 can be temporarily stored on the buffer rack 6 to avoid blockage of the loading and unloading conveyor line 2 or shutdown of the preceding process, thereby improving the flexibility and overall operational stability of the chrome plating line of tubular workpieces.

[0051] Specific work procedures: ① The loading and unloading conveyor line 2 transports the workpiece to be plated to one side of the line changing component 4. The operator or automatic clamping mechanism moves the workpiece to be plated away from the loading and unloading conveyor line 2 and fixes both ends of the workpiece to be plated on the mounting base 303 of the support frame 302 on both sides of the rotating hanger 3. ② The support base 402 of the line changing assembly 4 supports the cathode conductive head 309 of the rotating hanger 3, driving the rotating hanger 3 to rise to the height of the electroplating station. ③ The crane frame 503 of the transfer assembly 5 moves along the travel track 502 to above the line changing assembly 4. The boom 504 descends so that the V-shaped support block 506 of the hook 505 forms a hook engagement with the crane hoisting part 311 at the top of the rotating hanger 3. The bearing seat 402 of the line changing assembly 4 descends or the boom 504 rises to a certain height to suspend the rotating hanger 3. ④ The transfer assembly 5 lifts the rotating fixture 3 to the target electroplating station. The boom 504 lowers and immerses the tubular workpiece on the rotating fixture 3 into the electroplating solution in the plating tank 1. The overhead crane lifting part 311 disengages from the hook 505. The boom 504 of the transfer assembly 5 moves away from the electroplating station. The cathode conductive head 309 of the rotating fixture 3 contacts and conducts electrical connection with the cathode seat on the outside of the plating tank 1 to perform electroplating. During the process, the drive motor 305 of the rotating fixture 3 drives each workpiece to be plated to rotate synchronously in the same direction, so that the surface of the tubular workpiece is in uniform contact with the electroplating solution to complete the electroplating. ⑤ After electroplating is completed, the transfer component 5 returns to the electroplating station, the boom 504 lowers so that the hook 505 is re-hooked with the overhead crane lifting part 311, and the rotating hanger 3 and the plated workpiece are lifted away from the plating tank 1. At the same time, the liquid receiving tray 507 is switched to the first position directly below the rotating hanger 3 to receive the electroplating liquid dripping from the plated workpiece. ⑥ The overhead crane 503 transports the rotating hanger 3 along the traveling track 502 to the top of the line changing assembly 4 or the buffer rack 6. If it is transported to the line changing assembly 4, the bearing seat 402 rises to support the cathode conductive head 309, the boom 504 descends to make the cross column 312 disengage from the top opening of the V-shaped support block 506, and the line changing assembly 4 drives the rotating hanger 3 to descend to the height of the loading and unloading conveyor line 2. ⑦ The operator or automatic disassembly mechanism removes the plated workpiece from the mounting base 303, and the loading and unloading conveyor line 2 outputs the plated workpiece, completing a complete electroplating operation cycle.

[0052] In summary, the chromium plating wire for tubular workpieces provided in this embodiment has the following advantages: 1) By using the horizontal rotation electroplating method, the core problems of swaying, eccentric swinging and uneven coating in traditional vertical suspension electroplating are fundamentally solved. At the same time, with the coordinated operation of the line changing component 4 and the transfer component 5, the tubular workpieces can be efficiently and stably transferred between the loading and unloading station and multiple electroplating stations, which significantly improves the electroplating quality and production efficiency. 2) The rotating fixture 3 adopts a modular design. The spacing between the two side support frames 302 is adjustable and the mounting bases 303 are arranged vertically side by side. It can flexibly adapt to tubular workpieces of different lengths and specifications. A single fixture can carry multiple workpieces for batch processing at the same time. With the alternating meshing of the transmission gear 304 and the driven gear 306, the synchronous rotation of multiple workpieces in the same direction is realized, ensuring the consistency of electroplating conditions and effectively improving the unit capacity and equipment utilization rate. 3) The separate design of the loading and unloading conveyor line 2 and the electroplating station, combined with the buffer setting of the buffer rack 6, enables the chrome plating line of tubular workpieces to have a high degree of flexibility and adaptability. It can be flexibly configured with single-line or multi-line loading and unloading modes according to process requirements, adapt to different production rhythms, and avoid mutual interference between processes, ensuring the continuity and stability of production. 4) The precise cooperation between the transfer component 5 and the line changing component 4, through the reliable hooking of the V-shaped support block 506 and the horizontal column 312, and the intelligent position switching of the liquid receiving tray 507, enables the rapid loading and unloading and clean transfer of the rotating hanger 3, effectively recovers residual electroplating solution after plating, reduces material loss and environmental pollution risks, and has a compact and reasonable overall layout with high space utilization, which is suitable for the needs of modern large-scale tubular workpiece chromium plating production.

[0053] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A chromium-plated wire for tubular workpieces, characterized in that, It includes a plating tank (1), a loading and unloading conveyor line (2), a rotating fixture (3), a line changing assembly (4), and a transfer assembly (5), wherein: Several plating tanks (1) are arranged in parallel to form several electroplating stations; The loading and unloading conveyor line (2) is located below one side of each of the electroplating stations. The loading and unloading conveyor line (2) is used to input the workpiece to be plated and output the plated workpiece. The rotating hanger (3) is used to load the workpiece to be plated on the loading and unloading conveyor line (2) and keep the workpiece to be plated horizontally and able to rotate. The line-changing assembly (4) is used to drive the rotating fixture (3) to switch between the height of the loading and unloading conveyor line (2) and the height of the electroplating station; The transfer component (5) is used to drive the rotating fixture (3) to move between the line changing component (4) and each of the electroplating stations, so that the workpiece to be plated is electroplated in the corresponding plating tank (1).

2. The chromium plating wire for tubular workpieces according to claim 1, characterized in that, The rotating hanger (3) includes a main support (301), on which two vertically downward extending support frames (302) are provided. Each support frame (302) is provided with several rotatable mounting seats (303). The mounting seats (303) are connected to each other through a transmission component to achieve linkage. The mounting seats (303) on the two support frames (302) are arranged in a one-to-one correspondence. One end of the workpiece to be plated is fixed by the mounting seat (303) of one support frame (302), and the other end of the workpiece to be plated is fixed by the mounting seat (303) of the other support frame (302).

3. The chromium plating wire for tubular workpieces according to claim 2, characterized in that, Each of the mounting seats (303) is vertically spaced on the support frame (302), so that each of the workpieces to be plated is vertically clamped side by side. The transmission assembly includes a plurality of transmission gears (304), and each mounting seat (303) has a transmission gear (304) on its rotating shaft. Adjacent transmission gears (304) cooperate to drive each other. A drive motor (305) is provided on the main bracket (301), and a linkage rod is provided at the output end of the drive motor (305). The linkage rod is rotatably mounted on the main support (301), and the linkage rod is arranged parallel to the rotation axis of the mounting base (303). The linkage rod is provided with a drive gear, which meshes with one of the transmission gears (304). A driven gear (306) is provided between the transmission gears (304) of two adjacent mounting bases (303). The driven gear (306) meshes with both transmission gears (304) at the same time, so that each workpiece to be plated rotates synchronously and in the same direction.

4. The chromium plating wire for tubular workpieces according to claim 3, characterized in that, The main support (301) is provided with two parallel crossbeams (307), and the top of the support frame (302) is provided with two claw arms (308). The two claw arms (308) are hooked onto the two crossbeams (307). The main support (301) is an insulator, and the support frame (302) and the mounting base (303) are both conductors. The two ends of the crossbeams (307) are provided with cathode conductive heads (309), and the surface of the crossbeams (307) is provided with conductive strips (310) that are connected to the cathode conductive heads (309) and in contact with the claw arms (308).

5. The chromium plating wire for tubular workpieces according to claim 4, characterized in that, The line changing assembly (4) includes a vertical frame (401) disposed on one side of the loading and unloading conveyor line (2). The vertical frame (401) is provided with two synchronously lifting and moving support seats (402), and the two support seats (402) support the two cathode conductive heads (309) respectively.

6. The chromium plating wire for tubular workpieces according to claim 1, characterized in that, Each of the electroplating stations is provided with a frame (501) above it. The frame (501) is provided with a traveling track (502) extending from the top of the line changing assembly (4) to the top of each of the electroplating stations. The transfer assembly (5) can move along the traveling track (502). The transfer assembly (5) includes a crane frame (503). The crane frame (503) is provided with a lifting arm (504) that can be raised and lowered. The lifting arm (504) is provided with a number of hooks (505). The top of the rotating hanger (3) is provided with a number of crane lifting parts (311) for the hooks (505) to be hooked.

7. The chromium plating wire for tubular workpieces according to claim 6, characterized in that, The crane hoisting unit (311) has horizontal columns (312) on both sides, and a V-shaped support block (506) is provided on the hook (505). The V-shaped support block (506) forms a lower limit on the horizontal column (312), and the horizontal column (312) can be dislodged from the top opening of the V-shaped support block (506).

8. The chromium plating wire for tubular workpieces according to claim 6, characterized in that, The bottom of the overhead crane (503) is provided with a liquid receiving tray (507). The liquid receiving tray (507) can switch between a first position and a second position. When the liquid receiving tray (507) is in the first position, the liquid receiving tray (507) is located directly below the rotating hanger (3) to receive the electroplating solution dripping from the plated workpiece. When the liquid receiving tray (507) is in the second position, the liquid receiving tray (507) is offset from directly below the rotating hanger (3) to avoid the lifting and lowering movement path of the rotating hanger (3).

9. The chromium plating wire for tubular workpieces according to claim 8, characterized in that, The bottom of the gantry frame (503) is provided with a transversely arranged channel steel (508), and the liquid receiving tray (507) is provided with a hanging wheel (509). The hanging wheel (509) is arranged to roll in the channel steel (508), so that the liquid receiving tray (507) can move horizontally. The gantry frame (503) is provided with a shift gear (510), and the liquid receiving tray (507) is provided with a transmission rack (511) that cooperates with the shift gear (510).

10. The chromium plating wire for tubular workpieces according to claim 6, characterized in that, A buffer rack (6) is provided on the moving path of the transfer component (5). The buffer rack (6) is used to temporarily store the rotating fixture (3) loaded with the workpiece to be plated or the workpiece after plating.

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