Positioning processing method of polar frame assembly for electrolytic cell and magnetic disc positioner

Abstract

The application discloses a positioning machining method of an electrode frame assembly for an electrolytic cell and a magnetic disc positioner. The magnetic disc positioner comprises an annular body, a plurality of electromagnets are uniformly arranged on the top surface of the body in the circumferential direction, at least two T-shaped grooves are arranged on the top surface of the body in the radial direction, and a T-shaped positioning pin is arranged in the T-shaped groove. In the method, the electrode frame assembly before and after overturning is respectively coarsely positioned and finely positioned by using the magnetic disc positioner. The electrode frame assembly is adsorbed by the magnetic force generated by the electromagnets by energizing the magnetic disc positioner, so that the clamping and positioning requirements of the front and back surfaces of the electrode frame assembly are met. The method has the advantages of simple process, low production difficulty, short machining time, quick positioning and alignment, time and labor saving, and effective reduction of product deformation.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical processing, and in particular to a positioning processing method for a pole frame assembly for an electrolytic cell and a magnetic disk locator. Background Art

[0002] Hydrogen, as an efficient, clean, sustainable, and carbon-free energy source, has garnered widespread attention worldwide and is being hailed as the energy source of the 21st century. Electrode frame assemblies, the primary component of alkaline water hydrogen electrolyzers, are currently in enormous demand.

[0003] The pole frame assembly consists of a welded pole frame and main pole plate. It is an ultra-thin product with a maximum diameter of 2406mm and a plate thickness of only 8.5mm. It requires high symmetry (only 0.5mm), and the main pole plate also has a large number of stamped bumps. When the pole frame assembly undergoes post-processing after welding, it is prone to deformation and suffers from poor stress release. Pre-processing positioning and alignment are extremely important, but because the pole frame assembly is a special-shaped part, it is not easy to position and alignment is difficult.

[0004] In the prior art, internal hole positioning is usually adopted. Therefore, before welding the pole frame and the main pole plate, the inner hole size of part of the main pole plate needs to be fine-machined to the desired position. Then, the welded pole frame assembly is fine-machined by aligning the inner hole. This method has the following problems:

[0005] (1) Since the later finishing process requires alignment and positioning with the inner hole, the finishing requirements for the inner hole size of the main plate before welding are high. Usually, the inner hole processing needs to meet the dimensional tolerance of 0-0.05mm, and the shape tolerance and roundness must be controlled within the precision requirements of 0.04mm, which leads to increased production difficulty, cycle and cost;

[0006] (2) Since the benchmark (inner hole) has been processed before welding, this processing method has higher requirements on the welding quality and weld gap of the product;

[0007] (3) Since the finishing process involves machining both the top and bottom surfaces of the pole frame assembly, the pole frame assembly needs to be flipped over and then repositioned. If the inner hole is used as a reference, a lot of time will be spent on clamping and alignment during machining, which is time-consuming and labor-intensive. Summary of the Invention

[0008] The purpose of the present invention is to solve the above technical problems and provide a positioning processing method for the pole frame assembly for the electrolytic cell with simple process, low production difficulty, short processing time, rapid positioning and alignment, saving time and labor, and effectively reducing product deformation.

[0009] The present invention also provides a magnetic disk locator which has a simple structure, is easy to operate, and can be positioned quickly and reliably for positioning processing of a pole frame assembly for an electrolytic cell.

[0010] The magnetic disk positioner for positioning and processing the pole frame assembly for electrolytic cells of the present invention comprises an annular body, a plurality of electromagnets are evenly arranged along the circumference of the top surface of the body, at least two T-shaped slots are radially arranged along the top surface of the body, and T-shaped positioning pins are installed in the T-shaped slots.

[0011] The bottom surface of the T-shaped groove is provided with at least one deep positioning groove, and the width of the deep positioning groove is greater than the width of the bottom surface of the T-shaped positioning pin.

[0012] A positioner is symmetrically provided on the inner side of the body. The positioner comprises a positioning bracket fixed on the inner side of the body. The positioning bracket is provided with at least one positioning hole in the radial direction. A spring and a positioning shaft are sequentially inserted into the positioning hole.

[0013] The top surface of the positioning shaft is a spherical surface.

[0014] The spherical size of the top surface of the positioning shaft is not less than the arc size of the concave point on the bottom surface of the main pole plate.

[0015] A pressure cover which is sleeved on the positioning shaft is arranged outside the positioning hole.

[0016] At least three positioning pin holes corresponding to the waist-shaped holes on the pole frame are also provided on the main body along the circumferential direction.

[0017] A positioning processing method for an electrolytic cell pole frame assembly comprises the following steps:

[0018] 1) Welding the pole frame and the main pole plate into a pole frame assembly, and placing the pole frame assembly vertically for aging and stress relief after welding;

[0019] 2) placing the disk locator on a machine tool for alignment, moving the T-shaped positioning pins in the T-slots to the corresponding positioning deep grooves for positioning, and placing the pole frame assembly on the multiple electromagnets on the top surface of the disk locator body, and being positioned by the T-shaped positioning pins;

[0020] 3) energizing the disk locator to cause the electromagnet to generate magnetic force to attract the pole frame assembly, and starting the machine tool to process the top surface of the pole frame assembly;

[0021] 4) After the top surface of the pole frame assembly is processed, the power is turned off, the magnetic force of the disk locator is released, the pole frame assembly is removed, and the locating pins are inserted into the locating pin holes of the disk locator and tightened with bolts; the pole frame assembly is flipped over and placed on the multiple electromagnets on the top surface of the disk locator body and is limited by the T-shaped locating pins. At the same time, the upper ends of the locating pins are inserted into the corresponding waist-shaped holes of the pole frame assembly to complete the positioning;

[0022] 5) Power on the disk locator to make the electromagnet generate magnetic force to attract the pole frame assembly, and start the machine tool to process the bottom surface of the pole frame assembly.

[0023] In the step 1), the weld gap between the main electrode plate and the electrode frame is controlled to be within 0.1 mm, and the protective gas is a mixed protective gas of carbon dioxide and argon.

[0024] In the step 1), the pole frame assembly is placed vertically at an angle of 70-85 degrees.

[0025] The stress relief time in step 1) is no less than 24 hours.

[0026] In the step 2), after the pole frame assembly is limited by the T-shaped positioning pin, the positioning shaft of the positioner is forced to move downward due to the gravity of the pole frame assembly, and the pole frame assembly is rotated so that the top end of the positioning shaft slides into the corresponding concave point on the bottom surface of the main pole plate under the action of the spring and is limited.

[0027] In view of the problems existing in the background technology, the inventors have made the following improvements:

[0028] (1) In order to effectively release residual stress, the inventor unexpectedly discovered that placing the pole frame assembly after welding vertically can effectively solve the deformation problem caused by insufficient residual stress release compared to placing it horizontally. The specific principle is still unclear. Preliminary analysis shows that since the pole frame assembly is an ultra-large and thin product, the welding stress release is relatively slow when placed horizontally, while the vertical position is affected by gravity and the stress release is faster. Within a limited time, the residual stress can be released faster. Preferably, it is better to use a vertical position with an inclination angle of 70-85 degrees. The gap between the pole plate and the pole frame weld is controlled to be within 0.1mm, and the shielding gas is a mixed shielding gas of carbon dioxide and argon to further reduce the deformation of the product after welding.

[0029] (2) A disk locator is used for fast and accurate positioning. On the one hand, the magnetic force generated by the electromagnet after power is turned on is used to adsorb the pole frame assembly to replace the traditional clamping tool; on the other hand, in order to achieve fast positioning, at least two T-shaped slots are radially arranged on the top surface of the main body, and T-shaped positioning pins are arranged in the slots. The two T-shaped positioning pins with different radial angles can achieve rough positioning of the pole frame assembly. Furthermore, considering that the processed pole frame assemblies may have different models and sizes, at least one positioning deep groove is also provided in the T-shaped slot as needed. Each positioning deep groove corresponds to a pole frame assembly of a certain set size. The T-shaped positioning pin is manually moved to fall into the corresponding positioning deep groove and then limited to achieve rough positioning of the pole frame assembly of the corresponding size.

[0030] (3) A locator is symmetrically provided on the inner side of the body. By utilizing the characteristic of the main pole plate with stamped concave and convex points and pre-designing the corresponding size, during precise positioning, it is only necessary to make the top end of the positioning shaft on the locator slide into the predetermined concave point on the bottom surface of the main pole plate under the action of the spring, so as to cleverly achieve precise positioning. Combined with the clamping method of the magnetic adsorption pole frame assembly after power is turned on, it has the following advantages: a. It replaces the traditional method of precise positioning of the inner hole, and does not require strict fine processing of the inner hole in advance. The size processing accuracy of the inner hole is reduced from 0-0.05mm to ±1mm, which greatly reduces the processing difficulty and cost; b. It does not require clamping of the inner hole, which solves the various problems caused by this and greatly improves the positioning and clamping speed; c. Due to the simplicity of clamping and positioning, it can be quickly flipped after power failure. After flipping, the waist-shaped hole processed on the main pole plate is combined with the three-point positioning principle to quickly and precisely position again, further shortening the time of the positioning process, ensuring accuracy while reducing the difficulty of operation, and the effect is significant. d. The positioning bracket is provided with at least one positioning hole in the radial direction. The specific number of positioning holes can be set according to the different sizes of the corresponding pole frame assemblies to be produced, so as to adapt to the production of pole frame assemblies of different sizes, and has good flexibility and adaptability.

[0031] The disk locator of the present invention has an extremely simple structure, low production cost, and high clamping and positioning efficiency. The method of the present invention is simple, solves the problem of long clamping and positioning time of the pole frame assembly, and also ensures corresponding processing accuracy and improves processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of a pole frame assembly;

[0033] Figure 2 This is a schematic diagram of the pole frame assembly placed vertically after welding;

[0034] Figure 3 This is a schematic diagram of a disk locator;

[0035] Figure 4 It is the side view of T-slot;

[0036] Figure 5 This is a schematic diagram of T-pin positioning;

[0037] Figure 6 It is a cross-sectional structural diagram of the positioner;

[0038] Figure 7 This is a schematic diagram of the installation of the positioning pin hole.

[0039] In the figure: 1-pole frame assembly; 2-pole frame; 2.1-waist-shaped hole; 3-main pole plate; 3.1-concave point; 4-bracket; 5-disk locator, 5.1-body; 5.2-electromagnet; 6-T-shaped slot; 6.1-positioning deep slot; 7-T-shaped positioning pin; 8-positioning hole; 9-spring; 10-positioning shaft; 11-pressure cover; 12-positioning pin hole; 13-positioner; 14-positioning bracket, 15-positioning pin. DETAILED DESCRIPTION

[0040] See also Figure 3 The disk locator 5 of the present invention comprises an annular body 5.1, a plurality of electromagnets 5 are evenly arranged along the circumference of the top surface of the body 5.4, and at least two T-shaped slots 6 (two symmetrical ones in the figure) are radially arranged along the top surface of the body 5.1. Figure 4 , a T-shaped positioning pin 7 is installed in the T-shaped slot 6. Figure 5 The bottom surface of the T-slot 6 is formed with at least one deep positioning groove 6.1 (two in the figure). The width of the deep positioning groove 6.1 is greater than the width of the bottom surface of the T-shaped positioning pin 7. This ensures that the T-shaped positioning pin 7 can fall into the corresponding deep positioning groove 6.1 after being moved, thus limiting the position of the T-shaped positioning pin 7 and ensuring that the outer diameter distance between the two T-shaped positioning pins is consistent with the outer diameter of the pole frame assembly 1. (The gap is about 1mm and is only used for rough positioning.)

[0041] The inner side of the body 5.1 is symmetrically provided with a positioner 13, see Figure 6 The positioner 13 includes a positioning bracket 14 fixed to the inner side of the main body 5.1, and at least one positioning hole 8 (two in the figure) is opened on the positioning bracket 14 along the radial front and rear of the main body 5.1. The spring 9 and the positioning shaft 10 are inserted into the positioning hole 8 in sequence. The top surface of the positioning shaft 10 is spherical and should be higher than the top surface height of the electromagnet 5.2. Preferably, the size of the spherical surface is not less than the arc surface size of the concave point 3.1 on the bottom surface of the main pole plate 3. The positioning hole 8 is provided with a pressure cover 11 that is sleeved on the positioning shaft 10.

[0042] See also Figure 7 The main body 5.1 is also provided with at least three positioning pin holes 12 corresponding to the waist-shaped holes 2.1 on the pole frame 2 along the circumferential direction, which are used for positioning when processing the reverse side of the pole frame assembly 1 by passing the positioning pin 15 upward through the corresponding positioning pin hole 12 and the waist-shaped hole 2.1.

[0043] See also Figure 1 The main pole plate 3 in the pole frame assembly 1 is a stamped part, on which thousands of concave points with different concave directions are distributed, and the concave points are spherical.

[0044] Embodiment of the positioning processing method of the pole frame assembly for the electrolytic cell:

[0045] The following steps are involved:

[0046] 1) Weld the pole frame 2 and the main pole plate 3 into a pole frame assembly 1 (see Figure 1 ), the welding gap between the main plate 3 and the pole frame 2 is controlled to be within 0.1 mm, and the shielding gas used during welding is a mixed shielding gas of carbon dioxide and argon, see Figure 2 After welding, place the pole frame assembly vertically (preferably at an angle of 70-85 degrees) on the bracket 4 for aging and stress relief for 24 hours. Use a copper rod to knock on various parts of the pole frame assembly surface every 3 hours to release welding residual stress.

[0047] 2) Place the disk locator 5 on the machine tool for alignment (the alignment method is prior art and will not be described in detail), move the T-shaped positioning pin 7 in the T-slot 6 to the corresponding positioning deep groove 6.1 for limiting the position, place the pole frame assembly 1 on the multiple electromagnets 5.2 on the top surface of the body 5.1 of the disk locator 5, and limit it by the T-shaped positioning pin 7 to complete the rough positioning; after the pole frame assembly 1 is roughly positioned by the T-shaped positioning pin 1, the positioning shaft 10 of the locator 13 is forced to move downward under the action of the gravity of the pole frame assembly 1, and the pole frame assembly 1 is gently rotated horizontally left and right, so that the top end of the positioning shaft 10 slides into the preset concave point 3.1 on the bottom surface of the corresponding main pole plate 2 under the reaction force of the spring 9 and limits the pole frame assembly 1. At this time, the center of the main pole plate 3 completely coincides with the center of the disk locator 5, and the fine positioning is completed (the entire positioning time is about 1 minute and 50 seconds);

[0048] 3) Powering on the disk locator 5 so that the electromagnet 5.1 generates magnetic force to attract the pole frame assembly 1, and starting the machine tool to perform normal processing (finish turning and milling) on ​​the top surface (front) of the pole frame assembly 1;

[0049] 4) After completing the top surface processing of the pole frame assembly 1, shut down the machine tool, simultaneously cut off the power to the disk locator 5, release the magnetic force of the disk locator 5, remove the pole frame assembly 1, insert the locating pin 15 from bottom to top into the locating pin hole 12 of the disk locator 5 and tighten it with a bolt; flip the pole frame assembly 1 over and place it on the multiple electromagnets 5.2 on the top surface of the main body 5.1 of the disk locator 5 and limit it with the T-shaped locating pin 7 (rough positioning). At this time, the upper end of the locating pin 15 is just inserted into the corresponding waist-shaped hole 2.1 of the pole frame assembly 1 to complete the fine positioning (positioning time only takes about 30 seconds);

[0050] 5) Power on the disk locator 5 so that the electromagnet 5.2 generates magnetic force to attract the pole frame assembly 1, and start the machine tool to process the bottom surface of the pole frame assembly 1. After the processing is completed, shut down the machine tool and power off the disk locator 5 at the same time, and the pole frame assembly 1 can be directly removed.

[0051] The above positioning processing method can ensure the processing accuracy while greatly saving the product clamping and alignment time. The daily output can be increased from the original 10 pieces to 120 pieces.

[0052] Comparative experiment:

[0053] Comparative Example 1: Using the above method, in step 1), the pole frame assembly 1 is placed on a bracket for horizontal aging to relieve stress, and the rest is the same as the embodiment of the processing method.

[0054] Evaluation of deformation results:

[0055] Comparative Example 1: When the device is horizontally laid for 24 hours, the outer dimensions are deformed by 2-3 mm, the flatness is deformed by 1.5-3 mm, and the misalignment is 0.6-1.4 mm.

[0056] In the embodiment of the present invention, when leaning against the bracket at 80 degrees for 24 hours, the external dimension deformation is reduced to 0-1mm, the flatness deformation is less than 1mm, and the misalignment is less than 0.3mm.

Claims

1. A magnetic disk locator for positioning a pole frame assembly for an electrolytic cell, comprising an annular body, characterized in that: A plurality of electromagnets are evenly arranged along the circumference of the top surface of the main body, and at least two T-shaped slots are radially provided along the top surface of the main body, and a T-shaped positioning pin is installed in the T-shaped slot; at least one deep positioning groove is provided on the bottom surface of the T-shaped slot, and the width of the deep positioning groove is greater than the width of the bottom surface of the T-shaped positioning pin; a positioner is symmetrically provided on the inner side of the main body, and the positioner includes a positioning bracket fixed on the inner side of the main body, and at least one positioning hole is opened on the positioning bracket in the radial direction front and back, and a spring and a positioning shaft are sequentially inserted into the positioning hole.

2. The magnetic disk locator for positioning and processing the pole frame assembly for an electrolytic cell according to claim 1, characterized in that: The top surface of the positioning shaft is a spherical surface.

3. The magnetic disk locator for positioning and processing the pole frame assembly for an electrolytic cell according to claim 2, characterized in that: The spherical size of the top surface of the positioning shaft is not less than the arc size of the concave point on the bottom surface of the main pole plate.

4. The magnetic disk locator for positioning and processing the pole frame assembly for an electrolytic cell according to claim 1, characterized in that: A pressure cover which is sleeved on the positioning shaft is arranged outside the positioning hole.

5. The magnetic disk locator for positioning and processing a pole frame assembly for an electrolytic cell according to any one of claims 1 to 4, characterized in that: At least three positioning pin holes corresponding to the waist-shaped holes on the pole frame are also provided on the main body along the circumferential direction.

6. A positioning processing method for a pole frame assembly for an electrolytic cell, characterized in that: The following steps are involved: 1) Welding the pole frame and the main pole plate into a pole frame assembly, and placing the pole frame assembly vertically for stress relief after welding, wherein the angle of the pole frame assembly vertically is 70-85 degrees; 2) placing the disk locator of claim 5 on a machine tool for alignment, moving the T-shaped locating pin in the T-slot to the corresponding deep locating groove for limiting the position, placing the pole frame assembly on the multiple electromagnets on the top surface of the main body of the disk locator and limiting the position by the T-shaped locating pin; when the pole frame assembly is limited by the T-shaped locating pin, the locator's locating shaft is forced to move downward under the action of the gravity of the pole frame assembly, and the pole frame assembly is rotated so that the top end of the locating shaft slides into the corresponding concave point on the bottom surface of the main pole plate under the action of the spring and is limited; 3) energizing the disk locator to cause the electromagnet to generate magnetic force to attract the pole frame assembly, and starting the machine tool to process the top surface of the pole frame assembly; 4) After the top surface of the pole frame assembly is processed, the power is turned off, the magnetic force of the disk locator is released, the pole frame assembly is removed, and the locating pins are inserted into the locating pin holes of the disk locator and tightened with bolts; the pole frame assembly is flipped over and placed on the multiple electromagnets on the top surface of the disk locator body and is limited by the T-shaped locating pins. At the same time, the upper ends of the locating pins are inserted into the corresponding waist-shaped holes of the pole frame assembly to complete the positioning; 5) Power on the disk locator to make the electromagnet generate magnetic force to attract the pole frame assembly, and start the machine tool to process the bottom surface of the pole frame assembly.

7. The method for positioning and processing a pole frame assembly for an electrolytic cell according to claim 6, wherein: In the step 1), the weld gap between the main pole plate and the pole frame is controlled to be within 0.1 mm.

8. The method for positioning and processing a pole frame assembly for an electrolytic cell according to claim 6, wherein: In the step 1), the aging stress relief time is not less than 24 hours.

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