Vertical continuous electroplating equipment and electroplating process

Abstract

The invention relates to the field of electroplating equipment, in particular to vertical continuous electroplating equipment and an electroplating technology.The vertical continuous electroplating equipment comprises an equipment rack, an electroplating bath body and a conveying steel belt, the electroplating bath body is installed on the equipment rack, two rows of liquid medicine nozzles are arranged in the electroplating bath body, and the two rows of liquid medicine nozzles are horizontally and oppositely arranged; the equipment rack is provided with a fixed disc frame and a movable disc frame, the fixed disc frame is installed on the equipment rack, the fixed disc frame is in running fit with a fixed rotating disc, the movable disc frame is in horizontal sliding fit with the equipment rack, the movable disc frame is in running fit with a movable rotating disc, and the conveying steel belt is wound between the fixed rotating disc and the movable rotating disc. The conveying steel belt is used for loading a PCB to be electroplated; the equipment rack is provided with a tensioning assembly, and the tensioning assembly is used for enabling the movable plate frame to horizontally move in the direction away from the fixed plate frame. The equipment rack is provided with a vibration assembly, and the vibration assembly is used for enabling the conveying steel belt to vibrate horizontally. The method has the effect of ensuring that the copper plating layer can be uniformly filled in the holes of the PCB.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electroplating equipment, in particular to a vertical continuous electroplating equipment and electroplating process. BACKGROUND

[0002] In the manufacturing process of printed circuit board (PCB), the vertical continuous electroplating (VCP) equipment has become the mainstream equipment in the industry due to its small footprint and high electroplating efficiency. The basic working principle is that the circuit board is clamped by a conveying steel belt to realize stable transmission in a vertical posture, so that the circuit board passes through multiple electroplating tanks containing electroplating solution one by one to complete the continuous electroplating reaction. For example, refer to the utility model with the publication number CN 207369430 U.

[0003] In the conventional through-hole electroplating or pattern electroplating process, the PCB passes through the pre-cleaning process and is then conveyed to the electroplating tank by the conveying steel belt for electroplating. A small amount of small bubbles generated during the circulation of the electroplating solution has little effect on the electroplating quality of the workpiece surface. Even if there is a slight effect, it can often be compensated by subsequent processes. Based on this, the traditional VCP equipment pays less attention to active elimination measures for bubbles in the tank during the structural design stage, and usually relies on the natural flow of the electroplating solution in the tank to passively discharge the bubbles.

[0004] However, with the rapid development of electronic products towards high density and miniaturization, the through-hole (TH) and blind via hole (BVH) filling electroplating technology with high aspect ratio has become a core and key technology in PCB manufacturing. A large number of small bubbles generated during the operation of the traditional VCP equipment will directly block the deposition channel of copper ions in the high aspect ratio hole filling electroplating, resulting in the difficulty of uniform filling of the copper plating layer in the hole, and further forming quality defects such as "hollow" or "hole break". SUMMARY

[0005] In order to ensure that the copper plating layer can be uniformly filled in the hole of the PCB, the present application provides a vertical continuous electroplating equipment.

[0006] The vertical continuous electroplating equipment provided by the present application adopts the following technical scheme: A vertical continuous electroplating equipment, comprising an equipment rack, an electroplating tank body and a conveying steel belt, the electroplating tank body is installed on the equipment rack, the inside of the electroplating tank body is provided with two rows of electroplating solution nozzles, and the two rows of electroplating solution nozzles are horizontally arranged opposite to each other. The device rack is provided with a fixed disc rack and a movable disc rack, the fixed disc rack is installed on the device rack, the fixed disc rack is rotationally matched with a fixed rotating disc, the movable disc rack is horizontally slidably matched with the device rack, the movable disc rack is rotationally matched with a movable rotating disc, the transmission steel belt is wound between the fixed rotating disc and the movable rotating disc, and the transmission steel belt is used for loading the PCB to be electroplated. The device rack is provided with a tensioning assembly, and the tensioning assembly is used for horizontally moving the movable disc rack away from the fixed disc rack. The device rack is provided with a vibration assembly, and the vibration assembly is used for horizontally vibrating the transmission steel belt.

[0007] Through the above technical scheme, after the PCB is immersed in the electroplating tank, the vibration assembly makes the transmission steel belt horizontally vibrate, drives the PCB to horizontally vibrate in the inside of the electroplating tank, makes the bubbles attached to the hole of the PCB separate from the PCB under the action of inertia, and removes the bubbles. In addition, when the PCB vibrates, the boundary layer of the chemical solution around the PCB is disturbed, the forced convection of the old chemical solution in the hole and the new chemical solution is accelerated, the stable supply of the copper ion concentration in the hole is ensured, the filling capacity is further improved, and the copper plating layer can be uniformly filled in the hole of the PCB.

[0008] When the transmission steel belt is horizontally vibrated by the vibration assembly, the movable disc rack is horizontally moved away from the fixed disc rack by the tensioning assembly, and then the transmission steel belt is kept moderately tensioned, which is beneficial to ensure that energy can be effectively and regularly transmitted to the transmission steel belt and make it vibrate, reduce the energy absorbed by the deformation of the transmission steel belt, and thus ensure that the vibration amplitude meets the requirements.

[0009] Optionally, the vibration assembly comprises a vibration cylinder and a steel belt impact head, the vibration cylinder is installed on the device rack, a piston rod of the vibration cylinder is horizontally directed to the transmission steel belt, and the steel belt impact head is installed on the piston rod of the vibration cylinder.

[0010] Through the above technical scheme, after the transmission steel belt is tensioned by the tensioning assembly, the steel belt impact head moves to the position of the transmission steel belt under the action of the vibration cylinder, so that the transmission steel belt is horizontally vibrated under the impact. Moreover, the distance between the tensioned transmission steel belt and the steel belt impact head is relatively constant, so that the transmission steel belt and the PCB can vibrate in a relatively stable range, reducing the adverse effects of bubbles being difficult to separate due to weak vibration, secondary bubbles being generated due to excessive vibration, or chemical solution convection being disturbed.

[0011] Optionally, the vibration assembly is located within the range of the input section L of the electroplating tank.

[0012] By adopting the technical scheme, the micro-bubbles generated in the pre-treatment process before electroplating, such as oil removal, water washing and hot washing, are removed by the vibration assembly located at the input section L, so that the cost and the removal effect of the bubbles are considered, and the excessive setting of the vibration assembly is reduced.

[0013] Optionally, the tensioning assembly comprises a tensioning traction rope and a tensioning counterweight, and two ends of the tensioning traction rope are respectively installed on the movable turntable and the tensioning counterweight.

[0014] By adopting the technical scheme, the tensioning assembly is tensioned by the gravity of the tensioning counterweight. Under the influence of the inertia of the tensioning counterweight, when the steel belt impact head impacts the transmission steel belt, the transmission steel belt is not easy to be excessively bent and deformed, so as to ensure that the steel belt impact head effectively and stably impacts the transmission steel belt, and the transmission steel belt and the PCB board can vibrate within a relatively stable range. Moreover, after long-term operation, the tensioning counterweight is not easy to have fatigue problems, and the tensioning force can be kept in an appropriate range for a long time.

[0015] Optionally, the vibration assembly is provided in plurality, the plurality of vibration assemblies are horizontally distributed along the conveying direction of the transmission steel belt, the equipment rack is provided with a plurality of support assemblies, and the plurality of support assemblies and the plurality of vibration assemblies are respectively located on two sides of the transmission steel belt. The support assembly comprises a support driving member and a steel belt support head, and the support driving member is used for horizontally approaching or moving away from the transmission steel belt. When the steel belt impact head contacts one side of the transmission steel belt, the steel belt support head contacts the other side of the transmission steel belt. When the steel belt impact head is separated from one side of the transmission steel belt, the steel belt support head is separated from the other side of the transmission steel belt.

[0016] By adopting the technical scheme, when the steel belt impact head impacts the transmission steel belt, the steel belt support head supports the transmission steel belt on the other side of the transmission steel belt, so that the transmission steel belt always maintains an appropriate distance from the steel belt impact head when being impacted, thereby ensuring stable transmission of energy. Therefore, the situation that part of the steel belt impact head cannot effectively contact the transmission steel belt due to the vibration cylinder synchronization error or the transmission steel belt not timely recovering from deformation is reduced. Moreover, after the steel belt impact head is separated from the transmission steel belt, the steel belt support head is also separated from the transmission steel belt, thereby reducing the interference of the steel belt support head on the vibration of the transmission steel belt.

[0017] Optionally, the steel belt support head is provided with a support head inclined surface, the transmission steel belt is provided with a plurality of steel belt through grooves along the thickness, the plurality of steel belt through grooves are horizontally distributed along the length direction of the transmission steel belt, and the steel belt through grooves all horizontally extend along the length direction of the transmission steel belt. The support driving member comprises a support base body, a steel belt support rod and a support spring, the support base body is installed on the equipment rack, the steel belt support rod is horizontally slidably arranged in the support base body, the steel belt support head is installed on one end of the steel belt support rod, and the support spring is arranged between the support base body and the other end of the steel belt support rod.

[0018] By adopting the above technical scheme, when the conveying steel belt is conveyed forward, the steel belt support head enters the steel belt through groove and then leaves, so that the steel belt support head can regularly contact or separate from the conveying steel belt along with the conveying of the conveying steel belt. When the steel belt impact head contacts one side of the conveying steel belt, the steel belt support head is located between two adjacent steel belt through grooves, so that the conveying steel belt can contact the steel belt impact head at a predetermined position. When the steel belt impact head separates from one side of the conveying steel belt, the steel belt support head slides into the inside of the steel belt through groove, so that the steel belt support head separates from the conveying steel belt. Thus, the structure, energy consumption and assembly cost of the vibration assembly are better saved, and the steel belt support head can strictly move according to the conveying steel belt and is not prone to errors.

[0019] Optionally, the support base body is provided with a support rod sliding groove and a positioning taper groove, the steel belt support rod is clearance-fitted in the support rod sliding groove, one end of the positioning taper groove with a large inner diameter is communicated with the support rod sliding groove, one end of the positioning taper groove with a small inner diameter penetrates the support base body horizontally, the steel belt support rod is provided with a positioning taper ring, the steel belt support rod penetrates the positioning taper groove horizontally, and the positioning taper ring normally abuts against the side wall of the positioning taper groove under the action of the support spring.

[0020] By adopting the above technical scheme, under normal circumstances, the positioning taper ring abuts against the positioning taper groove under the action of the support spring, so that the steel belt support head can be accurately fitted to the steel belt through groove according to the design. If the conveying steel belt abnormally deforms due to vibration cylinder synchronization error or its own deformation not timely recovering, etc., the shape and position of the steel belt through groove change, and the steel belt support head collides with the steel belt through groove obliquely, the positioning taper ring exits from the positioning taper groove, and the steel belt support rod has enough clearance to adaptively swing and reduce the collision intensity, so that the steel belt support head is more easily adapted to the steel belt through groove of the conveying steel belt for a long time. Moreover, as the exiting amount of the positioning taper ring increases, the swing range of the steel belt support rod also increases, so that the activity of the steel belt support head meets the accuracy requirement and the adaptability requirement.

[0021] Optionally, the support base body is provided with a base body key groove penetratingly arranged therein, the base body key groove extends along the length direction of the steel belt support rod, and the support base body is installed on the equipment rack through bolts penetratingly arranged in the base body key groove.

[0022] By adopting the technical scheme, the position of the support seat body is adjusted adaptively according to the change of the vibration amplitude of the transmission steel belt (for example, when the PCB board of different specifications and weights is replaced), so that the inner wall of the steel belt through groove can be in contact with different positions of the inclined surface of the support head, thereby reducing the adverse effect of the steel belt support head on the vibration of the transmission steel belt. For example, when the PCB board of small weight is transmitted, the frequency and amplitude of the vibration of the transmission steel belt are large, at this time, the support seat body can be appropriately moved away from the transmission steel belt, and then the steel belt support head is also moved away from the transmission steel belt, so that the situation that the steel belt support head excessively extends into the steel belt through groove or collides with the upper and lower side walls of the steel belt through groove is reduced.

[0023] A vertical continuous electroplating process is implemented by the vertical continuous electroplating equipment.

[0024] Optionally, the vertical continuous electroplating process comprises the following steps: S1, pretreatment: sequentially performing oil removal, hot washing, washing and pre- immersion on the PCB board; S2, plate electroplating: loading the PCB board on the transmission steel belt, and then immersing the PCB board in the electroplating tank body through the transmission steel belt; When the PCB board is immersed in the inside of the electroplating tank body, the transmission steel belt is horizontally vibrated by the vibration assembly; S3, post-treatment: sequentially performing washing, pickling, three-stage washing and drying on the PCB board.

[0025] In summary, the present application has at least one of the following beneficial technical effects: After the PCB board is immersed in the electroplating tank body, the vibration assembly makes the transmission steel belt horizontally vibrate, which drives the PCB board to horizontally vibrate in the inside of the electroplating tank body, so that the bubbles attached to the hole of the PCB board are separated from the PCB board under the action of inertia, thereby removing the bubbles. In addition, when the PCB board vibrates, the boundary layer of the chemical solution around the PCB board is disturbed, which accelerates the forced convection of the old chemical solution in the hole and the new chemical solution, thereby ensuring the stable supply of copper ion concentration in the hole, further improving the hole filling capacity, and enabling the copper plating layer to be uniformly filled in the hole of the PCB board. When the transmission steel belt is horizontally vibrated by the vibration assembly, the movable disc holder is horizontally moved away from the fixed disc holder by the tensioning assembly, and then the transmission steel belt is kept moderately tensioned, which is beneficial to ensure that the energy can be effectively and regularly transmitted to the transmission steel belt and make it vibrate, and reduce the energy absorbed by the deformation of the transmission steel belt, thereby ensuring that the vibration amplitude meets the requirements.

[0026] After the transmission steel belt is tensioned by the tensioning assembly, the steel belt impact head moves towards the position of the transmission steel belt under the action of the vibration cylinder, so that the transmission steel belt is horizontally vibrated under the impact. Moreover, the distance between the transmission steel belt and the steel belt impact head after being tensioned is relatively constant, so that the transmission steel belt and the PCB board can vibrate in a relatively stable range, reducing the adverse effects of bubbles being difficult to separate due to too weak vibration, secondary bubbles being generated due to too strong vibration, or turbulent convection of the chemical solution. The tensioning assembly tensions the transmission steel belt by the gravity of the tensioning counterweight. Under the influence of the inertia of the tensioning counterweight, when the transmission steel belt is impacted by the steel belt impact head, the transmission steel belt is not prone to excessive bending deformation, thereby being conducive to ensuring that the steel belt impact head effectively and stably impacts the transmission steel belt, so that the transmission steel belt and the PCB board can vibrate in a relatively stable range. Moreover, after long-term operation, the tensioning counterweight is not prone to fatigue problems, which is also conducive to keeping the tensioning force in an appropriate range for a long time. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is an embodiment schematic diagram of the vertical continuous electroplating equipment of the embodiment 1 of the present application.

[0028] Figure 2 is an installation schematic diagram of the fixed disc holder of the embodiment 1 of the present application.

[0029] Figure 3 is an overall schematic diagram of the fixed disc holder of the embodiment 1 of the present application.

[0030] Figure 4 is an installation schematic diagram of the movable disc holder of the embodiment 1 of the present application.

[0031] Figure 5 is an overall schematic diagram of the movable disc holder of the embodiment 1 of the present application.

[0032] Figure 6 is a partial schematic diagram of the transmission steel belt of the embodiment 1 of the present application.

[0033] Figure 7 is an overall schematic diagram of the electroplating tank of the embodiment 1 of the present application.

[0034] Figure 8 is an internal schematic diagram of the electroplating tank of the embodiment 1 of the present application.

[0035] Figure 9 is a cooperation schematic diagram of the vibration assembly and the transmission steel belt of the embodiment 1 of the present application.

[0036] Figure 10 is a cooperation schematic diagram of the whole stack assembly and the transmission steel belt of the embodiment 2 of the present application.

[0037] Figure 11is a distribution diagram of the vibration assembly and the support assembly of Embodiment 2 of the present application.

[0038] Figure 12 is a whole diagram of the support assembly of Embodiment 2 of the present application.

[0039] Figure 13 is a cross-sectional diagram of the support assembly of Embodiment 2 of the present application.

[0040] Figure 14 is a cross-sectional diagram of the support assembly of Embodiment 3 of the present application.

[0041] Figure 15 is an exploded diagram of the support assembly of Embodiment 3 of the present application.

[0042] Figure 16 is an exploded diagram of the support assembly of Embodiment 3 of the present application.

[0043] BRIEF DESCRIPTION OF DRAWINGS 1, electroplating tank body; 11, chemical nozzle; 2, transmission steel belt; 201, steel belt through slot; 21, electroplating clamp; 22, negative electrode; 23, conductive lug; 24, steel belt guide roller; 3, fixed disc rack; 31, first sliding block; 32, fixed rotary disc; 33, first screw rod; 34, speed reducer motor; 4, movable disc rack; 41, tensioning pulley; 42, tensioning traction rope; 43, tensioning counterweight; 44, second sliding block; 45, movable rotary disc; 46, second screw rod; 5, vibration assembly; 51, vibration cylinder; 52, steel belt impact head; 6, support assembly; 61, steel belt support head; 611, support head inclined surface; 62, support seat body; 621, seat body key groove; 622, support rod sliding groove; 623, positioning taper groove; 63, steel belt support rod; 631, positioning taper ring; 64, support spring. DETAILED DESCRIPTION

[0044] The following will be described in detail below with reference to the accompanying drawings Figures 1-16 The present application will be further described in detail.

[0045] Embodiment 1: The present embodiment discloses a vertical continuous electroplating equipment. Referring to Figure 1 , the vertical continuous electroplating equipment comprises an equipment rack, an electroplating tank body 1 and a transmission steel belt 2. The equipment rack is in a long strip shape, the electroplating tank body 1 is arranged at the middle section of the equipment rack, the two ends of the equipment rack are respectively provided with a fixed disc rack 3 and a movable disc rack 4, and the electroplating tank is located between the fixed disc rack 3 and the movable disc rack 4.

[0046] Referring to Figure 2 and Figure 3The fixed disc rack 3 is fixedly installed on the equipment rack, two first sliding blocks 31 are horizontally slidably connected with the fixed disc rack 3, and the two first sliding blocks 31 are distributed in the vertical direction. A fixed rotating disc 32 is arranged between the two first sliding blocks 31, the top and bottom of the fixed rotating disc 32 are rotatably connected with the two first sliding blocks 31 respectively, so that the fixed rotating disc 32 can be rotatably connected with the fixed disc rack 3 through the first sliding blocks 31. A first lead screw 33 is rotatably connected with the first sliding block 31, the first lead screw 33 is horizontally arranged, and the first lead screw 33 is threadedly connected with the fixed disc rack 3. By rotating the first lead screw 33, the first sliding block 31 can be horizontally slid, so that the position of the fixed rotating disc 32 can be finely adjusted according to the actual working condition. The equipment rack is fixedly installed with a speed reducer 34, and the output shaft of the speed reducer 34 is coaxially and fixedly installed on the fixed rotating disc 32, so as to drive the fixed rotating disc 32 to rotate.

[0047] Referring to Figure 4 and Figure 5 The movable disc rack 4 is horizontally slidably connected with the equipment rack through four slide rods which are arranged in a rectangular shape and are fixedly installed on the equipment rack. The equipment rack is provided with a tensioning assembly for horizontally moving the movable disc rack 4 away from the fixed disc rack 3. The tensioning assembly can be elastic or gravitational, that is, the movable disc rack 4 is moved away from the fixed disc rack 3 by the elastic force of the elastic member or the gravity of the counterweight.

[0048] In the embodiment of the present application, the tensioning assembly is preferably gravitational with relatively constant tension. Specifically, the tensioning assembly comprises a tensioning pulley 41, a tensioning traction rope 42 and a tensioning counterweight 43. The tensioning pulley 41 is provided with a plurality of tensioning pulleys 41, one part of which is rotatably connected with the movable disc rack 4, and the other part of which is rotatably connected with the equipment rack. The tensioning traction rope 42 is provided with two tensioning traction ropes 42 which are distributed in the vertical direction. The tensioning traction rope 42 is fixedly installed at the beginning of the movable disc rack 4, and the tensioning traction rope 42 is wound in a zigzag shape on each tensioning pulley 41 in sequence, and the end of the tensioning traction rope 42 is arranged in the movable disc rack 4 through the traction hole provided in the movable disc rack 4. The tensioning counterweight 43 is provided with two tensioning counterweights 43 which are respectively fixedly connected to the ends of the two tensioning traction ropes 42 through a reversing fixed pulley (not shown in the figure), so that the movable disc rack 4 can be horizontally moved away from the fixed disc rack 3 under the action of the gravity of the tensioning counterweight 43 through the reversing fixed pulley and each tensioning pulley 41.

[0049] The movable disc holder 4 is horizontally slidably connected with two second sliding blocks 44 which are distributed along the vertical direction. A movable rotating disc 45 is arranged between the two second sliding blocks 44, and the top and bottom of the movable rotating disc 45 are rotatably connected with the two second sliding blocks 44 respectively, so that the movable rotating disc 45 can be rotatably connected with the movable disc holder 4 through the second sliding blocks 44. The second sliding blocks 44 are rotatably connected with a second screw rod 46 which is horizontally arranged and is threadedly connected with the movable disc holder 4. By rotating the second screw rod 46, the second sliding blocks 44 can be horizontally slid, so that the position of the movable rotating disc 45 can be finely adjusted according to the actual working condition.

[0050] With reference to Figures 1 to 5 The transmission steel belt 2 is arranged between the fixed rotating disc 32 and the movable rotating disc 45, so as to drive the transmission steel belt 2 to horizontally rotate along the conveying direction Vs through the fixed rotating disc 32 and the movable rotating disc 45. Also, the movable rotating disc 45 can be driven to move away from the fixed rotating disc 32 through the tensioning assembly, the first screw rod 33 and / or the second screw rod 46, so as to tension the transmission steel belt 2, thereby ensuring that the transmission steel belt 2 is always within the appropriate tension range, reducing the influence of the transmission steel belt 2 on the vibration transmission efficiency due to over-looseness, or the resonance of the equipment rack and the wear of the clamp due to over-tightness.

[0051] With reference to Figure 6 The transmission steel belt 2 is provided with a plurality of electroplating clamps 21 which are sequentially distributed along the conveying direction of the transmission steel belt 2. The electroplating clamp 21 comprises a fixed handle fixedly arranged on the transmission steel belt 2, a movable handle rotatably connected with the fixed handle, and a spring between the fixed handle and the movable handle, so as to clamp the PCB board through the elastic force, thereby enabling the PCB board to be electroplated to be loaded on the transmission steel belt 2 and enabling the PCB board to move horizontally and linearly along the conveying direction Vp. According to the specification of the PCB board, different numbers of electroplating clamps 21 can be selected to clamp and fix the top of the PCB board.

[0052] The equipment rack is provided with a negative electrode 22 connected to the negative electrode of the power supply, and the transmission steel belt 2 is electrically connected to the negative electrode 22 through the conductive ear 23 at the top. The electroplating clamp 21 is electrically connected to the transmission steel belt 2, so that the PCB board is electrically connected to the electroplating cathode through the electroplating clamp 21 and the transmission steel belt 2, thereby enabling the copper ions to be stably deposited on the PCB board and form a copper plating layer. In addition, the conductive ear 23 is also rotatably connected with a steel belt guide wheel 24 which is rollingly adapted to the steel belt guide rail of the equipment rack, so that the transmission steel belt 2 can stably move along the horizontal direction.

[0053] With reference to Figure 7 and Figure 8The electroplating tank body 1 is located at the bottom of the transmission steel belt 2, and the inside of the electroplating tank body 1 can be used to hold electroplating liquid, so as to electroplate the PCB board loaded on the bottom of the transmission steel belt 2. The electroplating tank body 1 is divided into several sections, and the electroplating tank bodies 1 of two adjacent sections are connected by bolts and sealing rings (not shown in the figure) to facilitate the assembly of electroplating tank bodies 1 of different specifications according to the site and production needs. The inside of the electroplating tank body 1 is provided with two rows of liquid nozzles 11, which are distributed along the width direction of the electroplating tank body 1, and both of which extend along the length direction of the electroplating tank body 1. Both rows of liquid nozzles 11 are connected to the liquid tank by a delivery pump (not shown in the figure) to spray electroplating liquid to the PCB board between the two rows of liquid nozzles 11 through the liquid nozzles 11. The two rows of liquid nozzles 11 are horizontally opposite to each other, so that the electroplating liquid can pass through or inject into the holes of the PCB board in the horizontal direction, thereby ensuring the exchange efficiency of the liquid in the holes and the electroplating efficiency.

[0054] With reference to Figure 1 , the equipment rack is provided with a plurality of vibration assemblies 5, which are horizontally and linearly distributed along the conveying direction of the transmission steel belt 2, that is, the length direction of the electroplating tank body 1. Figure 1 The plurality of vibration assemblies 5 are all located within the range of the input section L of the electroplating tank body 1, so as to vibrate the PCB board when it just enters the electroplating tank body 1, to reduce the adverse effects of micro-bubbles generated in the PCB board pre-treatment process, and to reduce the excessive setting of vibration assemblies.

[0055] With reference to Figure 8 and Figure 9 , the vibration assembly 5 includes a cylinder housing, a vibration cylinder 51 and a steel belt impact head 52. The cylinder housing and the vibration cylinder 51 are both fixedly installed on the equipment rack, and the cylinder housing covers the vibration cylinder. The piston rod of the vibration cylinder 51 horizontally faces the transmission steel belt 2, and the steel belt impact head 52 fixedly installed on the piston rod of the vibration cylinder 51, so as to impact the transmission steel belt 2 through the steel belt impact head 52 under the action of the vibration cylinder 51, thereby vibrating the transmission steel belt 2 and the PCB board.

[0056] When the PCB board vibrates, the bubbles attached to the orifice of the PCB board are inertially stripped, so that the bubbles are separated from the PCB board under the action of inertia, thereby removing the bubbles. In addition, when the PCB board vibrates, the boundary layer of the chemical solution around the PCB board is disturbed, the convection exchange of the old chemical solution in the hole and the new chemical solution is promoted, and the stable supply of the copper ion concentration in the hole is ensured, thereby further improving the hole filling capacity, so that the copper plating layer can be uniformly and quickly filled in the hole of the PCB board. At the same time, due to the high plating hole filling efficiency in the hole, it is also convenient for engineers to design thinner surface copper (copper plating layer formed on the surface of the PCB board instead of inside the hole), reducing the workload of subsequent processing, waste or recycling of surface copper, thereby also helping to reduce production costs.

[0057] The implementation principle of the vertical continuous electroplating equipment of the embodiment 1 of the present application is that the transmission steel belt 2 continuously rotates under the action of the deceleration motor 34, drives the PCB board loaded on the transmission steel belt 2 to immerse in the electroplating tank body 1, and makes the PCB board move horizontally along the conveying direction Vp until the PCB board completes electroplating and leaves the electroplating tank body 1.

[0058] The vibration cylinder 51 stretches and contracts the steel belt impact head 52 at a preset frequency, so that the transmission steel belt 2 vibrates horizontally, thereby driving the PCB board to vibrate horizontally inside the electroplating tank body 1. The micro-bubbles attached to the orifice of the PCB board are separated from the PCB board under the action of inertia, thereby removing the bubbles. In addition, when the PCB board vibrates horizontally, the electroplating chemical solution sprayed from the two rows of chemical solution nozzles 11 is more easily introduced into the inside of the PCB board, and the boundary layer of the chemical solution around the PCB board is disturbed, which is beneficial to accelerate the circulation of the old chemical solution in the hole and the new chemical solution, thereby ensuring the stable supply of the copper ion concentration in the hole, further improving the hole filling capacity, and enabling the copper plating layer to be uniformly and quickly filled in the hole of the PCB board.

[0059] Embodiment 2: The embodiment of the present application discloses a vertical continuous electroplating equipment, in addition to all the technical features of embodiment 1, further comprising the following technical features: Referring to Figure 10 , the equipment rack is provided with a plurality of support assemblies 6, and the plurality of support assemblies 6 and the plurality of vibration assemblies 5 are respectively located on both sides of the transmission steel belt 2, and the plurality of vibration assemblies 5 are respectively arranged opposite to each support assembly 6. Figure 11 The support assembly 6 comprises a support driving member and a steel belt support head 61, and the support driving member is used to make the steel belt support head 61 horizontally close to or horizontally away from the transmission steel belt 2.

[0060] When the steel belt impact head 52 contacts one side of the conveying steel belt 2, the steel belt support head 61 contacts the other side of the conveying steel belt 2, and then the conveying steel belt 2 is temporarily supported and limited by the steel belt support head 61, so that the steel belt impact head 52 is more easily impacted on the conveying steel belt 2 at the required position and time, and the problem of the impact position deviating due to the conveying steel belt 2 being too loose or deformed too much is reduced, and then the problem of the conveying steel belt 2 being unstable is caused.

[0061] With reference to Figure 10 , the conveying steel belt 2 is provided with a plurality of oval steel belt through grooves 201 penetrating through the thickness, a plurality of steel belt through grooves 201 are horizontally distributed along the length direction of the conveying steel belt 2, and the plurality of steel belt through grooves 201 all extend along the length direction of the conveying steel belt 2. The height of the steel belt through groove 201 is greater than the thickness of the steel belt support head 61, the steel belt support head 61 is provided with a support head inclined surface 611, and the support head inclined surface 611 makes the steel belt support head 61 approximately triangular in shape. One end of the steel belt support head 61 with a large width is connected to the support driving member, so as to conveniently extend the steel belt support head 61 into the steel belt through groove 201 or abut the steel belt support head 61 to the conveying steel belt 2 by the support driving member.

[0062] In some other embodiments, the support driving member can be selected as an existing air cylinder or an electric telescopic rod and the like power output element. In the embodiments of the present application, with reference to Figure 12 and Figure 13 , the support driving member includes a support seat body 62, a steel belt support rod 63 and a support spring 64. The support seat body 62 is vertically provided with a seat body key groove 621 penetrating through, the seat body key groove 621 extends along the length direction of the steel belt support rod 63, and the support seat body 62 is installed on the equipment rack through the bolts (not shown in the figure) penetrating through the seat body key groove 621, so as to conveniently adjust the horizontal position of the support seat body 62 by loosening or tightening the bolts. According to the change of the vibration amplitude of the conveying steel belt 2, the position of the support seat body 62 is adjusted adaptively, so that the inner wall of the steel belt through groove 201 can contact different positions of the support head inclined surface 611, thereby reducing the adverse effect of the steel belt support head 61 on the vibration of the conveying steel belt 2.

[0063] The inside of the support seat body 62 is provided with a support rod sliding groove 622, the steel belt support rod 63 is horizontally slidably fitted in the support seat body 62 through the support rod sliding groove 622, and the protruding part of the steel belt support rod 63 is attached to the side wall of the support rod sliding groove 622, so that the steel belt support rod 63 can stably horizontally extend and retract. The steel belt support head 61 is fixedly installed at one end of the steel belt support rod 63, the support spring 64 is located between the support seat body 62 and the other end of the steel belt support rod 63, and the two ends of the support spring 64 are respectively installed on the support seat body 62 and the steel belt support rod 63, so as to reset the steel belt support rod 63 in time after retraction by the support spring 64.

[0064] The implementation principle of the vertical continuous electroplating equipment of the embodiment 2 of the present application is that when the conveying steel belt 2 is conveyed forward, the steel belt supporting head 61 enters the steel belt through groove 201 and then leaves, so that the steel belt supporting head 61 can regularly contact or separate from the conveying steel belt 2 with the conveying of the conveying steel belt 2. When the steel belt impact head 52 contacts one side of the conveying steel belt 2, the steel belt supporting head 61 is located between two adjacent steel belt through grooves 201 and abuts against the conveying steel belt 2, so that the conveying steel belt 2 can contact the steel belt impact head 52 at a predetermined position. When the steel belt impact head 52 separates from one side of the conveying steel belt 2, the steel belt supporting head 61 slides into the inside of the steel belt through groove 201, so that the steel belt supporting head 61 separates from the conveying steel belt 2. Thus, the structure, energy consumption and assembly cost of the vibration assembly 5 are better saved, and the steel belt supporting head 61 can strictly move according to the conveying steel belt 2 and is not prone to errors.

[0065] Embodiment 3: The embodiment of the present application discloses a vertical continuous electroplating equipment, which is different from the embodiment 2 in that the protruding part of the steel belt supporting rod 63 does not fit the side wall of the supporting rod sliding groove 622, and the protruding part of the steel belt supporting rod 63 is replaced by a gap fit in the side wall of the supporting rod sliding groove 622.

[0066] Furthermore, the vertical continuous electroplating equipment of the embodiment of the present application also comprises the following technical features: Referring to Figures 14 to 16 The supporting seat body 62 is provided with a positioning taper groove 623, one end of the positioning taper groove 623 with a large inner diameter is communicated with the supporting rod sliding groove 622, and the other end of the positioning taper groove 623 with a small inner diameter horizontally penetrates the supporting seat body 62. The steel belt supporting rod 63 horizontally penetrates the positioning taper groove 623, and the steel belt supporting rod 63 is gap-fitted in the positioning taper groove 623 and the supporting rod sliding groove 622, so that the steel belt supporting rod 63 can swing in the inside of the positioning taper groove 623 and the supporting rod sliding groove 622 without limitation. The steel belt supporting rod 63 is integrally provided with a positioning taper ring 631, and the shape of the positioning taper ring 631 is adapted to the positioning taper groove 623. The positioning taper ring 631 is gap-fitted in the supporting rod sliding groove 622, so that the positioning taper ring 631 can swing in the inside of the supporting rod sliding groove 622 without limitation. The positioning taper ring 631 normally abuts against the side wall of the positioning taper groove 623 under the action of the supporting spring 64, so that the steel belt supporting rod 63 and the positioning taper ring 631 are kept in a coaxial state and a horizontal state by the positioning taper groove 623.

[0067] The implementation principle of the vertical continuous electroplating equipment of the embodiment 3 is as follows: under normal circumstances, the positioning cone ring 631 is abutted against the positioning cone groove 623 under the action of the supporting spring 64, so that the steel belt supporting head 61 can be accurately fitted to the steel belt through groove 201 according to the design. If the transmission steel belt 2 abnormally deforms due to the vibration cylinder 51 synchronization error or the self deformation of the transmission steel belt 2, etc., the shape and position of the steel belt through groove 201 change, and then the steel belt supporting head 61 collides with the steel belt through groove 201 at an angle, the positioning cone ring 631 will exit from the positioning cone groove 623, and then the steel belt supporting rod 63 has enough clearance to adaptively swing and reduce the collision intensity, so that the steel belt supporting head 61 is more easily adapted to the steel belt through groove 201 of the transmission steel belt 2 for a long time. Moreover, as the exit amount of the positioning cone ring 631 increases, the swing range of the steel belt supporting rod 63 also increases, so that the activity of the steel belt supporting head 61 meets the accuracy requirement and the adaptability requirement.

[0068] Embodiment 4: The embodiment discloses a vertical continuous electroplating process, which is implemented by the vertical continuous electroplating equipment of the embodiments 1, 2 or 3, and includes the following steps: S1, pretreatment: sequentially performing oil removal, hot washing, water washing and pre- immersion on the PCB board.

[0069] In the S1 step: The oil removal refers to removing the oil stains on the surface of the PCB board by using an alkaline oil removal agent. The hot washing refers to immersing the PCB board in a hot washing tank at 40-60 ℃.

[0070] The water washing refers to cleaning the PCB board by using normal temperature water (for example, ultrasonic water washing or high pressure water washing).

[0071] The pre-immersion refers to removing the metal oxide layer and impurities on the surface of the PCB board by using a pre-immersion liquid (for example, a dilute sulfuric acid solution with a concentration less than 10%).

[0072] S2, board electroplating: loading the PCB board on the transmission steel belt 2, and then immersing the PCB board in the electroplating tank body 1 by the transmission steel belt 2. When the PCB board is immersed in the inside of the electroplating tank body 1 within the input section L, the transmission steel belt 2 is horizontally vibrated by the vibration assembly 5. After the PCB board is immersed in the electroplating tank body 1, the electroplating liquid is sprayed to the middle PCB board by the two rows of liquid nozzles 11, so as to promote the circulation of the electroplating liquid in the holes of the PCB board. S3, post-treatment: sequentially performing water washing, pickling, three-stage water washing and drying on the PCB board.

[0073] In the S3 step, the three-stage water washing refers to: the first stage (rough washing): flushing most of the residual acid liquid to reduce the concentration of pollutants; the second stage (middle washing): further diluting the residual with flowing clean water; and the third stage (fine washing): using deionized water or ultrapure water, cooperating with high-pressure spraying or ultrasonic oscillation, to further remove trace acid ions in the plate and hole, and reduce the occurrence of the situation that the residual acid liquid causes corrosion of the plated layer or poor subsequent processing.

[0074] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A vertical continuous electroplating equipment, characterized in that: It includes an equipment frame, an electroplating tank (1) and a conveyor steel belt (2). The electroplating tank (1) is installed on the equipment frame. The electroplating tank (1) is provided with two rows of chemical nozzles (11) inside. The two rows of chemical nozzles (11) are arranged horizontally opposite each other. The equipment frame is provided with a fixed plate frame (3) and a movable plate frame (4). The fixed plate frame (3) is installed on the equipment frame and is rotatably fitted with a fixed turntable (32). The movable plate frame (4) is horizontally slidably fitted on the equipment frame and is rotatably fitted with a movable turntable (45). The transmission steel belt (2) is wound between the fixed turntable (32) and the movable turntable (45). The transmission steel belt (2) is used to load the PCB board to be electroplated. The equipment frame is equipped with a tensioning assembly, which is used to make the movable disc frame (4) move horizontally away from the fixed disc frame (3); The equipment frame is equipped with a vibration assembly (5), which is used to make the transmission steel belt (2) vibrate horizontally.

2. The vertical continuous electroplating equipment according to claim 1, characterized in that: The vibration assembly (5) includes a vibration cylinder (51) and a steel belt impact head (52). The vibration cylinder (51) is mounted on the equipment frame. The piston rod of the vibration cylinder (51) is horizontally oriented towards the transmission steel belt (2). The steel belt impact head (52) is mounted on the piston rod of the vibration cylinder (51).

3. A vertical continuous electroplating equipment according to claim 1 or 2, characterized in that: The vibration component (5) is located within the input segment L of the electroplating tank (1).

4. A vertical continuous electroplating equipment according to claim 2, characterized in that: The tensioning assembly includes a tensioning traction rope (42) and a tensioning counterweight (43), with the two ends of the tensioning traction rope (42) respectively installed on the movable turntable (45) and the tensioning counterweight (43).

5. A vertical continuous electroplating equipment according to claim 2, characterized in that: The vibration component (5) is provided in several ways, and the vibration component (5) is horizontally distributed along the conveying direction of the conveying steel belt (2). The equipment frame is provided with several support components (6), and the support components (6) and the vibration components (5) are respectively located on both sides of the conveying steel belt (2). The support assembly (6) includes a support drive and a steel strip support head (61), the support drive being used to move the steel strip support head (61) horizontally closer to or horizontally further away from the transmission steel strip (2); When the steel strip impact head (52) contacts one side of the transmission steel strip (2), the steel strip support head (61) contacts the other side of the transmission steel strip (2); When the steel strip impact head (52) detaches from one side of the transmission steel strip (2), the steel strip support head (61) detaches from the other side of the transmission steel strip (2).

6. A vertical continuous electroplating equipment according to claim 5, characterized in that: The steel strip support head (61) is provided with a support head inclined surface (611), and the transmission steel strip (2) is provided with a plurality of steel strip through grooves (201) along the thickness. The plurality of steel strip through grooves (201) are horizontally distributed along the length direction of the transmission steel strip (2), and the steel strip through grooves (201) all extend horizontally along the length direction of the transmission steel strip (2). The support drive component includes a support base (62), a steel strip support rod (63), and a support spring (64). The support base (62) is mounted on the equipment frame. The steel strip support rod (63) slides horizontally and is fitted to the support base (62). The steel strip support head (61) is mounted on one end of the steel strip support rod (63). The support spring (64) is located between the support base (62) and the other end of the steel strip support rod (63).

7. A vertical continuous electroplating equipment according to claim 6, characterized in that: The support base (62) has a support rod groove (622) and a positioning cone groove (623). The steel strip support rod (63) is fitted with the support rod groove (622) with a clearance. The end of the positioning cone groove (623) with a larger inner diameter is connected to the support rod groove (622). The end of the positioning cone groove (623) with a smaller inner diameter horizontally passes through the support base (62). The steel strip support rod (63) is provided with a positioning cone ring (631). The steel strip support rod (63) is horizontally inserted into the positioning cone groove (623), and the positioning cone ring (631) normally abuts against the side wall of the positioning cone groove (623) under the action of the support spring (64).

8. A vertical continuous electroplating equipment according to claim 6, characterized in that: The support base (62) has a keyway (621) extending through it. The keyway (621) extends along the length of the steel strip support rod (63). The support base (62) is installed on the equipment frame by bolts passing through the keyway (621).

9. A vertical continuous electroplating process, characterized in that: This is carried out using the vertical continuous electroplating equipment described in claim 1 or 2.

10. A vertical continuous electroplating process according to claim 9, characterized in that: S1. Pretreatment: The PCB board is sequentially degreased, hot washed, washed with water, and pre-soaked. S2, Electroplating of PCB board: The PCB board is loaded onto the conveyor steel belt (2), and then the PCB board is immersed in the electroplating tank (1) through the conveyor steel belt (2); When the PCB board is immersed in the electroplating tank (1), the transmission steel belt (2) is vibrated horizontally by the vibration component (5); S3. Post-processing: The PCB board is sequentially washed with water, acid-washed, three-stage washed with water, and dried.

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