A surface corrosion-resistant treatment process for neodymium-iron-boron magnets

Abstract

The present invention relates to the technical field of surface treatment of neodymium iron boron magnets, and specifically relates to a surface corrosion-resistant treatment process for neodymium iron boron magnets, which includes the following steps: Select handling fixtures according to the shape of the neodymium iron boron magnets to be electroplated, and install a number of handling fixtures horizontally in a rectangular shape on the handling rack; Install the neodymium iron boron magnets into a number of handling fixtures in sequence through an automatic feeding component; Use a gantry crane to move the entire handling rack to the degreasing tank and perform degreasing operation at room temperature; Rinse at room temperature; Acid wash under an ultrasonic acid washing tank and perform water washing under an ultrasonic water washing tank; Clean 2-3 times in sequence along the first multi-stage water washing tank; Perform passivation in the passivation tank; Clean 2-3 times in sequence along the second multi-stage water washing tank; Electroplate in the electroplating tank. This application has an automatic and efficient feeding function, improves the feeding efficiency of the magnets, avoids magnet bumping, and improves the yield rate of the products.

Description

Technical Field

[0001] The present invention relates to the technical field of surface treatment of neodymium iron boron magnets, and specifically relates to a surface corrosion-resistant treatment process for neodymium iron boron magnets. Background Art

[0002] Neodymium magnets, also known as NdFeB magnets, are tetragonal crystals formed by neodymium, iron, and boron (Nd2Fe14B). In 1982, Masato Sagawa of Sumitomo Special Metals discovered neodymium magnets. The magnetic energy product BHmax of this magnet is greater than that of samarium cobalt magnets, making it the material with the largest magnetic energy product in the world at that time. Later, Sumitomo Special Metals successfully developed the powder metallurgy process, and General Motors successfully developed the melt-spinning process, enabling the preparation of neodymium iron boron magnets. This magnet is currently the permanent magnet with the second highest magnetism after holmium magnets at absolute zero temperature and is also the most commonly used rare earth magnet. Neodymium iron boron magnets are widely used in electronic products, such as hard disks, mobile phones, headphones, and battery-powered tools.

[0003] In the prior art, surface treatment of rare earth permanent magnets has three functions: improving corrosion resistance, using various surface protections to resist corrosion from humid environments, acids, alkalis, salts, and harmful gases; thoroughly cleaning the magnet surface, such as removing loose magnetic particles on the surface, to form a smooth surface to prevent loose magnetic particles from affecting the function or damaging the magnetic system; and operation protection, preventing magnetic particles from falling off during assembly or operation. However, in the prior art, during electroplating surface treatment, a large number of magnets are usually placed in a container and flipped during the electroplating process to achieve uniform electroplating operation. This method is not suitable for larger or irregularly shaped magnets such as tile-shaped magnets, as it is easy to cause the magnets to bump into each other, resulting in magnet damage. Although it can be used for small magnets, it still easily causes bumps and economic losses.

[0004] Therefore, it is necessary to design a surface corrosion-resistant treatment process for neodymium iron boron magnets to solve the above problems. Summary of the Invention

[0005] Based on this, in view of the problems in the prior art, a surface corrosion-resistant treatment process for neodymium iron boron magnets is provided.

[0006] To solve the problems in the prior art, the technical solution adopted by the present invention is as follows:

[0007] The present invention provides a surface corrosion-resistant treatment process for neodymium iron boron magnets, including the following steps:

[0008] S1: Select a handling jig according to the shape of the NdFeB magnet to be electroplated, and install several handling jigs in a horizontal rectangular shape on the handling rack;

[0009] S2: Install the NdFeB magnets into several handling jigs in sequence through the automatic loading assembly;

[0010] S3: The transport frame is transported to the degreasing tank by the gantry crane and degreasing is performed at room temperature;

[0011] S4: transport the transport rack to the washing pool and wash it at room temperature;

[0012] S5: transporting the transport rack to an ultrasonic pickling tank, pickling at room temperature, and then transporting the transport rack to an ultrasonic water washing tank, water washing at room temperature;

[0013] S6: transporting the transport rack to the first multi-stage water washing tank, washing at room temperature, and washing 2-3 times in sequence along the first multi-stage water washing tank;

[0014] S7: transport the transport rack to the passivation tank for passivation;

[0015] S8: transporting the transport rack to the second multi-stage water washing tank, washing at room temperature, and washing 2-3 times in sequence along the second multi-stage water washing tank;

[0016] S9: Move the transport rack to the electroplating tank, energize each NdFeB magnet, and complete the electroplating process.

[0017] Preferably, the automatic loading assembly in step 2 includes a horizontal displacement mechanism, a working platform, a magnet transmission mechanism, a pushing mechanism, a second mounting frame, a clamping mechanism and a downward driving mechanism;

[0018] Horizontal displacement mechanism, the output direction is perpendicular to the movement direction of the gantry crane;

[0019] The working platform is fixedly mounted horizontally on the output end of the horizontal displacement mechanism;

[0020] The magnet transmission mechanism is fixedly installed on the working platform, and the transmission direction of the magnet transmission mechanism is consistent with the transmission direction of the gantry crane;

[0021] The pushing mechanism is installed on the working platform, and the output direction of the pushing mechanism is consistent with the transmission direction of the gantry crane;

[0022] A second mounting bracket is fixedly mounted on the output end of the pushing mechanism;

[0023] A clamping mechanism is provided on the second mounting frame;

[0024] The downward pressing driving mechanism is fixedly mounted on the second mounting frame, and the output end of the downward pressing driving mechanism is arranged vertically downward.

[0025] Preferably, the magnet conveying mechanism includes a first mounting frame, a conveyor belt, an adjustable baffle, a hinged plate and a spring;

[0026] A first mounting frame is fixedly mounted on the working platform;

[0027] A conveyor belt is arranged on the first mounting frame, and a transmission direction of the conveyor belt is consistent with a transmission direction of the gantry crane;

[0028] There are two sets of adjustable baffles, which are symmetrically arranged along the vertical center plane of the conveyor belt, and the distance between the two sets of adjustable baffles is adjustable;

[0029] A hinged plate is horizontally arranged on a side of the first mounting frame close to the clamping mechanism, and one end of the hinged plate is hinged to the first mounting frame;

[0030] One end of the spring is fixedly connected to an end of the first mounting bracket close to the second mounting bracket, and the other end of the spring is hinged to an end of the hinge plate away from the first mounting bracket.

[0031] Preferably, the automatic feeding assembly further comprises a rotary drive mechanism, which is arranged on the second mounting frame, and the clamping mechanism is provided with four groups, and the rotary drive mechanism comprises a rotating shaft, a rotating disk, a connecting mounting plate and a rotary driver;

[0032] The rotating shaft is arranged horizontally, the axis direction of the rotating shaft is perpendicular to the transmission direction of the gantry crane, and both ends of the rotating shaft are axially connected to the second mounting frame;

[0033] The rotating disk is vertically fixed on the rotating shaft, and the rotating disk and the rotating shaft are coaxially arranged;

[0034] There are four connecting mounting plates, which are distributed in a ring around the rotating shaft. Four sets of clamping mechanisms are respectively fixedly mounted on one end of the four connecting mounting plates away from the rotating shaft.

[0035] The rotary driver is arranged at one end of the second mounting frame, and the output end of the rotary driver is fixedly connected to the end of the rotating shaft.

[0036] Preferably, the downward pressure driving mechanism includes a downward pressure driving cylinder, a lifting push plate, a shaft sleeve and a mounting plate;

[0037] A shaft connecting sleeve, the shaft is connected to the rotating shaft;

[0038] A mounting plate is fixedly mounted below the shaft coupling sleeve, and the mounting plate is fixedly connected to the second mounting bracket;

[0039] The downward pressure driving cylinder is vertically fixedly mounted on the mounting plate, and the output direction of the downward pressure driving cylinder is set vertically downward;

[0040] The lifting and pushing plate is arranged below the downward pressure driving cylinder in a liftable manner, and the output end of the downward pressure driving cylinder is fixedly connected to the lifting and pushing plate.

[0041] Preferably, the handling rack described in step 1 includes a grid-shaped rack body, a conductive pipeline, and a conductive contact plate;

[0042] The grid-shaped rack body is provided with a plurality of buckles for clamping the handling jig;

[0043] The conductive pipeline is arranged at the bottom of the grid-shaped rack body, and one end of the conductive pipeline is connected to the external power supply of the electroplating bath;

[0044] There are a plurality of conductive contact plates, and the plurality of conductive contact plates are respectively located inside the plurality of handling jigs. The conductive contact plates are located at the bottom end of the handling jigs. The conductive contact plates are connected to the conductive pipeline, and a conductive needle for conducting electricity is provided at the top end of the conductive contact plate.

[0045] Preferably, the handling jig described in step 1 includes a frame and two auxiliary clamping mechanisms arranged inside the frame.

[0046] Preferably, a plurality of vertically dense vertical water permeable grooves are uniformly arranged on the outer side wall of the frame, and a bottom water permeable groove for water permeation is further arranged at the bottom end of the frame.

[0047] Preferably, the auxiliary clamping mechanism includes a contact plate and a first spring. The contact plate is vertically arranged inside the frame, the first spring is horizontally arranged, one end of the first spring is fixedly connected to the side wall of the contact plate close to the frame, the other end of the first spring is fixedly connected to the inner side wall of the frame, an inclined chamfer is provided at the top end of the contact plate, the inclined chamfer is located on one side where the two contact plates are close to each other, and a plurality of horizontally opened water permeable holes are uniformly arranged on the contact plate.

[0048] Preferably, the auxiliary clamping mechanism further includes a contact needle. An installation notch is opened on the side wall of the lower half of the auxiliary clamping mechanism on one side of the inclined chamfer, and a plurality of contact needles are horizontally arranged in the installation notch.

[0049] The beneficial effects of this application compared with the prior art are:

[0050] 1. The handling jig can be used to separately carry larger magnets, and different types of magnets can be placed with handling jigs of different sizes, avoiding the large magnets stacking together and being prone to mutual collision and breakage during flipping during electroplating, and improving the yield rate of products.

[0051] 2. The automatic feeding component can achieve the function of quickly and accurately feeding the magnets. The horizontal displacement mechanism and the pushing mechanism cooperate to enable the clamping mechanism to accurately displace to directly above each handling jig. The magnet transmission mechanism works to sequentially conduct the magnets to the feeding position of the clamping mechanism. The pressing drive mechanism pushes the magnets clamped by the clamping mechanism into the handling jig for loading, eliminating the problem of magnets knocking against each other.

[0052] 3. When the clamping mechanism clamps the magnet, after clamping the magnet, the clamping mechanism continues to move downward. At this time, the clamping mechanism squeezes the hinge plate to rotate around the hinge point until the hinge plate disengages from the bearing effect on the magnet, enabling the magnet to be smoothly taken out from the automatic feeding component. When a feeding operation is completed, the spring drives the hinge plate to reset, enabling the hinge plate to continue to bear the next magnet to be fed. This method is convenient for improving the feeding speed and the efficiency of automatic feeding.

[0053] 4. The rotation drive mechanism can enable the four groups of clamping mechanisms to work alternately, greatly improving the working efficiency. The rotation driver outputs to drive the rotating shaft to rotate. When the rotating shaft rotates, it drives the rotating disk fixedly connected to it to rotate synchronously. The rotating disk drives the connecting mounting plate to move, and then drives the clamping mechanism installed on the connecting mounting plate to move. In this way, after one clamping mechanism completes the feeding and clamping, there is no need to wait for it to reset before performing another clamping.

[0054] 5. When electroplating is required, an external current is introduced into a number of conductive contact plates through a conductive pipeline, and then the current is introduced onto the magnets inside each handling jig through the conductive pins on the conductive contact plates, facilitating the electroplating operation of the magnets. The conductive pins can minimize the contact area while maintaining contact with the magnets, thus ensuring the electroplating effect.

[0055] 6. The vertical water permeable grooves and the bottom water permeable grooves on the frame ensure that the external water can flow into the frame unobstructed and can quickly fill the frame, ensuring the normal progress of operations such as water washing, pickling, electroplating, etc. The quick filling of the frame improves the overall operation efficiency and avoids the oxidation of the magnet surface due to too long time.

[0056] 7. The contact plate can keep the magnet stable. When the entire handling rack shakes, the magnet will press against the contact plate to compress the first spring, enabling the magnet to have a certain amount of shaking. This kind of shaking can improve the contact effect between the magnet and the liquid inside the frame on the premise of ensuring that the magnet will not be knocked. The inclined chamfer is convenient for the magnet to be inserted between the two contact plates, and the water permeable holes ensure the contact between the magnet and the liquid inside the frame. Description of the Drawings

[0057] Figure 1 is the process flow chart of the embodiment;

[0058] Figure 2 Schematic three-dimensional structure diagram of the automatic loading component, handling rack and handling fixture of the embodiment;

[0059] Figure 3 Schematic three-dimensional structure diagram of the automatic loading component of the embodiment;

[0060] Figure 4 Schematic three-dimensional structure diagram of the magnet transmission mechanism of the embodiment;

[0061] Figure 5 Schematic three-dimensional structure diagram of the rotary drive mechanism and the downward pressure drive mechanism of the embodiment;

[0062] Figure 6 Schematic three-dimensional structure diagram of the downward pressure drive mechanism of the embodiment;

[0063] Figure 7 Schematic three-dimensional structure diagram of the handling rack and the handling fixture of the embodiment;

[0064] Figure 8 Schematic three-dimensional structure diagram of the handling rack of the embodiment;

[0065] Figure 9 Schematic three-dimensional structure diagram of the handling fixture of the embodiment;

[0066] Figure 10 Schematic three-dimensional structure diagram of the auxiliary clamping mechanism of the embodiment;

[0067] Figure 11 Front view of the auxiliary clamping mechanism of the embodiment.

[0068] The reference numerals in the figure are:

[0069] 1 - Automatic loading component; 2 - Handling rack; 3 - Handling fixture; 1a - Working platform; 1b - Magnet transmission mechanism; 1b1 - First mounting rack; 1b2 - Conveyor belt; 1b3 - Adjustable baffle; 1b4 - Hinged plate; 1b5 - Spring; 1c - Pushing mechanism; 1d - Second mounting rack; 1e - Clamping mechanism; 1f - Downward pressure drive mechanism; 1f1 - Downward pressure drive cylinder; 1f2 - Lifting and pushing plate; 1f3 - Axial joint sleeve; 1f4 - Mounting plate; 1g - Rotary drive mechanism; 1g1 - Rotating shaft; 1g2 - Rotating disk; 1g3 - Connecting mounting plate; 1g4 - Rotary drive; 2a - Grid-like frame body; 2b - Conductive pipeline; 2c - Conductive contact plate; 3a - Frame; 3a1 - Vertical water permeable groove; 3a2 - Bottom water permeable groove; 3b - Auxiliary clamping mechanism; 3b1 - Contact plate; 3b2 - First spring; 3b3 - Inclined chamfer; 3b4 - Water permeable hole; 3b5 - Mounting notch; 3b6 - Contact pin. Detailed implementation manners

[0070] To further understand the features, technical means, specific purposes, and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0071] As Figures 1-11 shown:

[0072] A surface corrosion-resistant treatment process for neodymium iron boron magnets includes the following steps:

[0073] S1: Select a handling fixture 3 according to the shape of the neodymium iron boron magnet to be electroplated, and install a number of handling fixtures 3 in a rectangular shape in the horizontal direction on the handling rack 2;

[0074] S2: Install the neodymium iron boron magnets into a number of handling fixtures 3 in sequence through the automatic feeding component 1;

[0075] S3: Use a gantry crane to move the entire handling rack 2 to the degreasing tank and perform degreasing operation at room temperature;

[0076] S4: Move the handling rack 2 to the rinsing tank and rinse at room temperature;

[0077] S5: Move the handling rack 2 to the ultrasonic pickling tank and pickle at room temperature, then move the handling rack 2 to the ultrasonic water washing tank and perform water washing at room temperature;

[0078] S6: Move the handling rack 2 to the first multi-stage water washing tank and perform water washing at room temperature, and wash 2 - 3 times in sequence along the first multi-stage water washing tank;

[0079] S7: Move the handling rack 2 to the passivation tank for passivation;

[0080] S8: Move the handling rack 2 to the second multi-stage water washing tank and perform water washing at room temperature, and wash 2 - 3 times in sequence along the second multi-stage water washing tank;

[0081] S9: Move the handling rack 2 to the electroplating tank, energize each neodymium iron boron magnet, and complete the electroplating process.

[0082] Based on the above embodiments, the problem of easy damage caused by knocking against each other when stacking larger neodymium iron boron magnets during electroplating is solved. The larger magnets can be individually carried through the handling fixture 3, and different models of magnets can be placed with handling fixtures 3 of different sizes, avoiding easy knocking and breaking against each other when the larger magnets are stacked and flipped during electroplating, and improving the yield rate of products.

[0083] It is worth mentioning that in the present application, the degreasing tank, rinsing tank, ultrasonic pickling tank, ultrasonic water washing tank, first multi-stage water washing tank, passivation tank, second multi-stage water washing tank and electroplating tank are successively arranged continuously along a straight line. The handling rack 2 can be erected in the above-mentioned tanks, the handling fixture 3 can be installed in the handling rack 2, and the gantry crane is arranged above, and the moving direction of the gantry crane is consistent with the continuous arrangement direction.

[0084] Degreasing agent is added to the degreasing tank, and ultrasonic equipment is added inside the degreasing tank. Flowing industrial pure water is passed through the rinsing tank. A certain concentration of nitric acid solution is provided in the ultrasonic pickling tank, and ultrasonic waves are passed through. A certain amount of industrial pure water is provided in the ultrasonic water washing tank, and ultrasonic waves are passed through.

[0085] It is worth mentioning that a lifting device for driving the two ends of the handling rack 2 to swing up and down can also be installed on the gantry crane, which increases the contact area between the neodymium iron boron magnet and the electroplating solution during the power-on process and improves the electroplating effect.

[0086] Furthermore:

[0087] The automatic feeding component 1 described in step 2 includes a horizontal displacement mechanism, a working platform 1a, a magnet transmission mechanism 1b, a pushing mechanism 1c, a second mounting frame 1d, a clamping mechanism 1e and a downward pressing drive mechanism 1f;

[0088] The horizontal displacement mechanism has an output direction perpendicular to the moving direction of the gantry crane;

[0089] The working platform 1a is horizontally and fixedly installed at the output end of the horizontal displacement mechanism;

[0090] The magnet transmission mechanism 1b is fixedly installed on the working platform 1a, and the transmission direction of the magnet transmission mechanism 1b is consistent with the transmission direction of the gantry crane;

[0091] The pushing mechanism 1c is installed on the working platform 1a, and the output direction of the pushing mechanism 1c is consistent with the transmission direction of the gantry crane;

[0092] The second mounting frame 1d is fixedly installed at the output end of the pushing mechanism 1c;

[0093] The clamping mechanism 1e is arranged on the second mounting frame 1d;

[0094] The downward pressing drive mechanism 1f is fixedly installed on the second mounting frame 1d, and the output end of the downward pressing drive mechanism 1f is vertically downward.

[0095] Based on the above embodiments, the automatic feeding component 1 can achieve the function of quickly and accurately feeding magnets. The horizontal displacement mechanism and the pushing mechanism 1c cooperate to enable the clamping mechanism 1e to accurately displace to directly above each handling jig 3. The magnet transmission mechanism 1b works to sequentially conduct the magnets to the feeding position of the clamping mechanism 1e, and the magnets clamped on the clamping mechanism 1e are pushed into the handling jig 3 for loading by the downward pressing drive mechanism 1f, eliminating the problem of magnets bumping into each other.

[0096] It is worth mentioning that the automatic feeding component 1 can realize the feeding process of magnets with different shapes and sizes, such as rectangular, arched, steel sheet-shaped magnets, etc., improving the practicability of the equipment.

[0097] Furthermore:

[0098] The magnet transmission mechanism 1b includes a first mounting bracket 1b1, a conveyor belt 1b2, adjustable baffles 1b3, a hinged plate 1b4, and a spring 1b5;

[0099] The first mounting bracket 1b1 is fixedly installed on the working platform 1a;

[0100] The conveyor belt 1b2 is arranged on the first mounting bracket 1b1, and the transmission direction of the conveyor belt 1b2 is the same as the transmission direction of the gantry crane;

[0101] There are two groups of adjustable baffles 1b3, which are symmetrically arranged along the vertical center plane of the conveyor belt 1b2, and the distance between the two groups of adjustable baffles 1b3 is adjustable;

[0102] The hinged plate 1b4 is horizontally arranged on one side of the first mounting bracket 1b1 close to the clamping mechanism 1e, and one end of the hinged plate 1b4 is hinged to the first mounting bracket 1b1;

[0103] One end of the spring 1b5 is fixedly connected to one end of the first mounting bracket 1b1 close to the second mounting bracket 1d, and the other end of the spring 1b5 is hinged to the end of the hinged plate 1b4 far from the first mounting bracket 1b1.

[0104] Based on the above embodiments, when the magnet conveying mechanism 1b is working, the conveyor belt 1b2 is used to sequentially transport the magnets. The magnet to be loaded is transported by the conveyor belt 1b2 to the hinge plate 1b4. The adjustable baffle 1b3 can change the distance between the two adjustable baffles 1b3 by adjusting the installation position between the first mounting bracket 1b1, so that magnets of different models can all move forward in sequence along the conveying direction of the conveyor belt 1b2. When the clamping mechanism 1e clamps the magnet, the clamping mechanism 1e continues to move downward after clamping the magnet. At this time, the clamping mechanism 1e presses the hinge plate 1b4 to rotate around the hinge point until the hinge plate 1b4 disengages from the bearing effect on the magnet, enabling the magnet to be smoothly taken out from the automatic feeding component 1. When a feeding operation is completed, the spring 1b5 drives the hinge plate 1b4 to reset, enabling the hinge plate 1b4 to continue to bear the next magnet to be loaded. This method facilitates increasing the feeding speed and improving the automatic feeding efficiency.

[0105] Furthermore:

[0106] The automatic feeding component 1 further includes a rotary drive mechanism 1g, which is arranged on the second mounting bracket 1d. There are four groups of clamping mechanisms 1e. The rotary drive mechanism 1g includes a rotating shaft 1g1, a rotating disk 1g2, a connecting mounting plate 1g3, and a rotary driver 1g4;

[0107] The rotating shaft 1g1 is horizontally arranged, and the axis direction of the rotating shaft 1g1 is perpendicular to the conveying direction of the gantry crane. Both ends of the rotating shaft 1g1 are axially connected to the second mounting bracket 1d;

[0108] The rotating disk 1g2 is vertically and fixedly sleeved on the rotating shaft 1g1, and the rotating disk 1g2 is coaxially arranged with the rotating shaft 1g1;

[0109] There are four connecting mounting plates 1g3, and the four connecting mounting plates 1g3 are axially connected and annularly distributed around the rotating shaft 1g1. The four groups of clamping mechanisms 1e are respectively fixedly installed at one end of the four connecting mounting plates 1g3 away from the rotating shaft 1g1;

[0110] The rotary driver 1g4 is arranged at one end of the second mounting bracket 1d, and the output end of the rotary driver 1g4 is fixedly connected to the end of the rotating shaft 1g1.

[0111] Based on the above embodiments, the rotary drive mechanism 1g can enable the four groups of clamping mechanisms 1e to work alternately, greatly improving the working efficiency. The rotary driver 1g4 outputs to drive the rotating shaft 1g1 to rotate. When the rotating shaft 1g1 rotates, it drives the rotating disk 1g2 fixedly connected thereto to rotate synchronously. The rotating disk 1g2 drives the connecting mounting plate 1g3 to move, and further drives the clamping mechanism 1e installed on the connecting mounting plate 1g3 to move. In this way, after one clamping mechanism 1e completes the feeding and clamping, there is no need to wait for it to reset before performing another clamping.

[0112] Furthermore:

[0113] The downward pressing drive mechanism 1f includes a downward pressing drive cylinder 1f1, a lifting and pushing plate 1f2, a shaft coupling sleeve 1f3, and a mounting plate 1f4;

[0114] The shaft coupling sleeve 1f3 is shaft-connected to the rotating shaft 1g1;

[0115] The mounting plate 1f4 is fixedly installed below the shaft coupling sleeve 1f3, and the mounting plate 1f4 is fixedly connected to the second mounting bracket 1d;

[0116] The downward pressing drive cylinder 1f1 is vertically and fixedly installed on the mounting plate 1f4, and the output direction of the downward pressing drive cylinder 1f1 is set vertically downward;

[0117] The lifting and pushing plate 1f2 is arranged below the downward pressing drive cylinder 1f1 in a liftable manner, and the output end of the downward pressing drive cylinder 1f1 is fixedly connected to the lifting and pushing plate 1f2.

[0118] Based on the above embodiment, after the clamping mechanism 1e clamps the magnet directly above the handling jig 3, the magnet is pressed into the handling jig 3 through the output of the downward pressing drive mechanism 1f. The output of the downward pressing drive cylinder 1f1 drives the lifting and pushing plate 1f2 to descend. The bottom end of the lifting and pushing plate 1f2 abuts against the top end of the magnet, thereby driving the magnet to gradually descend and enter the handling jig 3. The shaft coupling sleeve 1f3 and the mounting plate 1f4 ensure that the lifting and pushing plate 1f2 can be stably maintained directly above the handling jig 3.

[0119] Furthermore:

[0120] The handling rack 2 described in step 1 includes a grid-shaped frame body 2a, a conductive pipeline 2b, and a conductive contact plate 2c;

[0121] The grid-shaped frame body 2a is provided with a plurality of buckles for clamping the handling jig 3;

[0122] The conductive pipeline 2b is arranged at the bottom of the grid-shaped frame body 2a, and one end of the conductive pipeline 2b is connected to the external power supply of the electroplating bath;

[0123] There are a plurality of conductive contact plates 2c. The plurality of conductive contact plates 2c are respectively located inside the plurality of handling jigs 3. The conductive contact plates 2c are located at the bottom end of the handling jig 3. The conductive contact plates 2c are connected to the conductive pipeline 2b, and the top end of the conductive contact plate 2c is provided with conductive needles for conducting electricity.

[0124] Based on the above embodiments, when electroplating is required, an external current is introduced into a plurality of conductive contact plates 2c through the conductive pipeline 2b, and then the current is introduced onto the magnets inside each handling fixture 3 through the conductive pins on the conductive contact plates 2c, facilitating the electroplating operation of the magnets. The conductive pins can minimize the contact area while maintaining contact with the magnets, thus ensuring the electroplating effect.

[0125] Further:

[0126] The handling fixture 3 described in step 1 includes a frame 3a and two auxiliary clamping mechanisms 3b arranged inside the frame 3a.

[0127] Further:

[0128] A plurality of densely arranged vertical water permeable grooves 3a1 are vertically and evenly provided on the outer side wall of the frame 3a, and a bottom water permeable groove 3a2 for water permeation is further provided at the bottom end of the frame 3a.

[0129] Based on the above embodiments, the vertical water permeable grooves 3a1 and the bottom water permeable groove 3a2 on the frame 3a ensure that the external water can flow into the frame 3a unobstructed and can quickly fill the frame 3a, ensuring the normal progress of operations such as water washing, pickling, electroplating, etc. The quick filling of the frame 3a can improve the overall operation efficiency and avoid the oxidation of the magnet surface caused by too long time.

[0130] Further:

[0131] The auxiliary clamping mechanism 3b includes a contact plate 3b1 and a first spring 3b2. The contact plate 3b1 is vertically arranged inside the frame 3a, the first spring 3b2 is horizontally arranged, one end of the first spring 3b2 is fixedly connected to the side wall of the contact plate 3b1 close to the frame 3a, the other end of the first spring 3b2 is fixedly connected to the inner side wall of the frame 3a, an inclined chamfer 3b3 is provided at the top end of the contact plate 3b1, the inclined chamfer 3b3 is located on the side where the two contact plates 3b1 are close to each other, and a plurality of horizontally opened water permeable holes 3b4 are evenly provided on the contact plate 3b1.

[0132] Based on the above embodiments, the two contact plates 3b1 symmetrically arranged inside the frame 3a are close to each other under the elastic force of the first spring 3b2. When the magnet is installed between the two contact plates 3b1, the magnet can be kept stable. At the same time, the elastic force of the first spring 3b2 is moderate. When the whole handling rack 2 shakes, the magnet will contact the contact plate 3b1 and compress the first spring 3b2, making the magnet produce a certain shake. This kind of shake can improve the contact effect between the magnet and the liquid inside the frame 3a on the premise of ensuring that the magnet will not be knocked. The inclined chamfer 3b3 facilitates the insertion of the magnet between the two contact plates 3b1, and the water permeable holes 3b4 ensure the contact between the magnet and the liquid inside the frame 3a.

[0133] Further:

[0134] The auxiliary clamping mechanism 3b also includes a contact pin 3b6. The lower half of the auxiliary clamping mechanism 3b is located on the side wall of the inclined chamfer 3b3 and has a mounting groove 3b5. There are several contact pins 3b6, and the several contact pins 3b6 are horizontally arranged in the mounting groove 3b5.

[0135] Based on the above embodiment, the contact needle 3b6 can further increase the contact area between the magnet and the liquid inside the frame 3a, which can improve the efficiency during cleaning and electroplating, and can also improve the uniformity of electroplating.

[0136] The above embodiments merely represent one or several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A surface corrosion resistance treatment process for NdFeB magnets, characterized in that: The following steps are included: S1: Select a transport jig (3) according to the shape of the NdFeB magnet to be electroplated, and install several transport jigs (3) in a rectangular shape on the transport frame (2) in the horizontal direction; S2: Installing the NdFeB magnets into several handling jigs (3) in sequence through the automatic loading assembly (1); S3: The transport frame (2) is transported as a whole to the degreasing tank by a gantry crane and degreasing is performed at room temperature; S4: transporting the transport rack (2) to a washing tank and washing it at room temperature; S5: transporting the transport rack (2) to an ultrasonic pickling tank, pickling at room temperature, and transporting the transport rack (2) to an ultrasonic water washing tank, water washing at room temperature; S6: transporting the transport rack (2) to the first multi-stage water washing tank, washing the material at room temperature, and washing the material 2 to 3 times in sequence along the first multi-stage water washing tank; S7: transporting the transport rack (2) to the passivation tank for passivation; S8: transporting the transport rack (2) to the second multi-stage water washing tank, washing at room temperature, and washing 2 to 3 times in sequence along the second multi-stage water washing tank; S9: transporting the transport rack (2) to the electroplating tank, energizing each NdFeB magnet to complete the electroplating process; The automatic loading assembly (1) in step 2 includes a second mounting frame (1d), a clamping mechanism (1e) and a downward pressing driving mechanism (1f); A clamping mechanism (1e) is arranged on the second mounting frame (1d); A downward pressure driving mechanism (1f) is fixedly mounted on the second mounting frame (1d), and an output end of the downward pressure driving mechanism (1f) is arranged vertically downward; The automatic feeding assembly (1) further includes a rotary drive mechanism (1g) disposed on a second mounting frame (1d); the clamping mechanism (1e) is provided with four groups; the rotary drive mechanism (1g) includes a rotating shaft (1g1), a rotating disk (1g2), a connecting mounting plate (1g3), and a rotary driver (1g4); The rotating shaft (1g1) is horizontally arranged, the axis direction of the rotating shaft (1g1) is perpendicular to the transmission direction of the gantry crane, and both ends of the rotating shaft (1g1) are axially connected to the second mounting frame (1d); There are four connecting mounting plates (1g3), the four connecting mounting plates (1g3) are axially connected and distributed in a ring around the rotating shaft (1g1), and the four sets of clamping mechanisms (1e) are respectively fixedly mounted on one end of the four connecting mounting plates (1g3) away from the rotating shaft (1g1); The downward pressure driving mechanism (1f) includes a downward pressure driving cylinder (1f1), a lifting push plate (1f2), a shaft connecting sleeve (1f3) and a mounting plate (1f4); A shaft coupling sleeve (1f3) is connected to the rotating shaft (1g1); A mounting plate (1f4) is fixedly mounted below the shaft coupling sleeve (1f3), and the mounting plate (1f4) is fixedly connected to the second mounting frame (1d); The downward pressure driving cylinder (1f1) is vertically fixedly mounted on the mounting plate (1f4), and the output direction of the downward pressure driving cylinder (1f1) is set vertically downward; A lifting push plate (1f2) is arranged to be able to be lifted and lowered directly below the downward driving cylinder (1f1), and the output end of the downward driving cylinder (1f1) is fixedly connected to the lifting push plate (1f2); After the clamping mechanism (1e) clamps the magnet just above the transport jig (3), the magnet is pressed into the transport jig (3) through the output of the downward pressure driving mechanism (1f).

2. The surface corrosion resistance treatment process of a NdFeB magnet according to claim 1, characterized in that: The automatic loading assembly (1) in step 2 further includes a horizontal displacement mechanism, a working platform (1a), a magnet transmission mechanism (1b) and a pushing mechanism (1c); Horizontal displacement mechanism, the output direction is perpendicular to the movement direction of the gantry crane; A working platform (1a) is fixedly mounted horizontally on the output end of the horizontal displacement mechanism; A magnet transmission mechanism (1b) is fixedly mounted on the working platform (1a), and a transmission direction of the magnet transmission mechanism (1b) is consistent with a transmission direction of the gantry crane; A pushing mechanism (1c) is installed on the working platform (1a), and the output direction of the pushing mechanism (1c) is consistent with the transmission direction of the gantry crane; The second mounting frame (1d) is fixedly mounted on the output end of the pushing mechanism (1c).

3. The surface corrosion resistance treatment process of a NdFeB magnet according to claim 2, characterized in that: The magnet transmission mechanism (1b) comprises a first mounting frame (1b1), a transmission belt (1b2), an adjustable baffle (1b3), a hinged plate (1b4) and a spring (1b5); A first mounting frame (1b1) is fixedly mounted on the working platform (1a); A conveyor belt (1b2) is arranged on the first mounting frame (1b1), and the transmission direction of the conveyor belt (1b2) is consistent with the transmission direction of the gantry crane; There are two sets of adjustable baffles (1b3), the two sets of adjustable baffles (1b3) are symmetrically arranged along the vertical center plane of the conveyor belt (1b2), and the spacing between the two sets of adjustable baffles (1b3) is adjustable; A hinged plate (1b4) is horizontally arranged on one side of the first mounting frame (1b1) close to the clamping mechanism (1e), and one end of the hinged plate (1b4) is hinged to the first mounting frame (1b1); One end of the spring (1b5) is fixedly connected to an end of the first mounting frame (1b1) close to the second mounting frame (1d), and the other end of the spring (1b5) is hinged to an end of the hinge plate (1b4) away from the first mounting frame (1b1).

4. The surface corrosion resistance treatment process of a NdFeB magnet according to claim 2, characterized in that: A rotating disk (1g2) is vertically fixedly sleeved on the rotating shaft (1g1), and the rotating disk (1g2) and the rotating shaft (1g1) are coaxially arranged; The rotary driver (1g4) is arranged at one end of the second mounting frame (1d), and the output end of the rotary driver (1g4) is fixedly connected to the end of the rotating shaft (1g1).

5. The surface corrosion resistance treatment process of a NdFeB magnet according to claim 1, characterized in that: The transport frame (2) in step 1 includes a grid-shaped frame (2a), a conductive pipe (2b) and a conductive contact plate (2c); A grid-shaped frame (2a) is provided with a plurality of buckles for clamping a transport jig (3); A conductive pipe (2b) is arranged at the bottom of the grid-shaped frame (2a), and one end of the conductive pipe (2b) is connected to an external power source of the electroplating pool; A plurality of conductive contact plates (2c) are provided, and the plurality of conductive contact plates (2c) are respectively located inside the plurality of transport jigs (3). The conductive contact plates (2c) are located at the bottom ends of the transport jigs (3). The conductive contact plates (2c) are connected to the conductive pipes (2b), and a conductive needle for conducting electricity is provided at the top ends of the conductive contact plates (2c).

6. The surface corrosion resistance treatment process of a NdFeB magnet according to claim 1, characterized in that: The transport jig (3) in step 1 comprises a frame (3a) and two auxiliary clamping mechanisms (3b) arranged inside the frame (3a).

7. The surface corrosion resistance treatment process of a NdFeB magnet according to claim 6, characterized in that: A plurality of densely distributed vertical water-permeable grooves (3a1) are vertically and evenly provided on the outer side wall of the frame (3a), and a bottom water-permeable groove (3a2) for water permeation is also provided at the bottom end of the frame (3a).

8. The surface corrosion resistance treatment process of a NdFeB magnet according to claim 7, characterized in that: The auxiliary clamping mechanism (3b) comprises a contact plate (3b1) and a first spring (3b2), wherein the contact plate (3b1) is vertically arranged in the frame (3a), and the first spring (3b2) is horizontally arranged, one end of the first spring (3b2) is fixedly connected to the side wall of the contact plate (3b1) close to the frame (3a), and the other end of the first spring (3b2) is fixedly connected to the inner side wall of the frame (3a), and the top end of the contact plate (3b1) is provided with an inclined chamfer (3b3), and the inclined chamfer (3b3) is located on the side where the two contact plates (3b1) are close to each other, and the contact plate (3b1) is evenly provided with a plurality of horizontally opened water-permeable holes (3b4).

9. The surface corrosion resistance treatment process of a NdFeB magnet according to claim 8, characterized in that: The auxiliary clamping mechanism (3b) further comprises a contact pin (3b6); a mounting groove (3b5) is provided on a side wall of the lower half of the auxiliary clamping mechanism (3b) located on one side of the inclined chamfer (3b3); a plurality of contact pins (3b6) are provided, and the plurality of contact pins (3b6) are horizontally arranged in the mounting groove (3b5).

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