Tool for maintaining electrolytic bath and method for maintaining electrolytic bath by adopting tool

Abstract

The invention relates to a tool for maintaining an electrolytic bath and a method for maintaining the electrolytic bath through the tool, the tool for maintaining the electrolytic bath comprises a screw rod, a nut and a sleeve assembly, the sleeve assembly comprises a flange and a sleeve welded to the lower portion of the flange, the lower end of the screw rod is arranged in a positioning hole of a disassembled assembly, and the nut is arranged in the sleeve. The sleeve is arranged between the screw rod and the hole wall of a positioning hole of a disassembled assembly, the nut is arranged on the screw rod in a sleeving mode and located above the flange, a conical base with the narrow upper portion and the wide lower portion is arranged at the bottom of the screw rod, and a conical face matched with the conical base of the screw rod is arranged at the bottom of the sleeve. The casing pipe assembly is divided into a plurality of casing pipe assembly sections along the circumferential direction, and a gap is formed between every two adjacent casing pipe assembly sections, so that dislocation of a cathode plate and an anode plate and integral scrapping of a PEM film are avoided, meanwhile, the maintenance efficiency is greatly improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of fuel cells, and particularly to a tooling for electrolytic cell maintenance and a method for maintaining an electrolytic cell using the tooling.

Background Art

[0002] A fuel cell stack is composed of an end plate, an insulating plate, and multiple single cells (each single cell includes a plate and a PEM membrane). After the above components are stacked, they are assembled together by a pressing force. In the prior art, it is relatively common to assemble the above components together through bolts and nuts. When the plate or PEM membrane of one of the single cells is damaged among the multiple single cells, first, the bolts and nuts need to be removed, and then the end plate, insulating plate, and single cells above the damaged single cell are all removed one by one, and then the damaged single cell is repaired. During the disassembly process, the plate is prone to planar displacement, resulting in misalignment of the anode and cathode plates and causing the entire PEM membrane to be scrapped. Therefore, this traditional maintenance method not only easily causes the entire PEM membrane to be scrapped, but also is time-consuming and reduces the maintenance efficiency of maintenance workers. Therefore, we wonder whether we can develop a tooling that enables all the end plates, insulating plates, and single cells above the damaged single cell to form a whole for disassembly and assembly when the damaged single cell needs to be repaired, so as to not only avoid the scrapping of the PEM membrane during disassembly and assembly, but also greatly improve the maintenance efficiency.

Summary of the Invention

[0003] To solve the above problems, the purpose of the present invention is to provide a tooling for electrolytic cell maintenance that can avoid the scrapping of the PEM membrane during the maintenance process and a method for maintaining an electrolytic cell using the tooling.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a tooling for electrolytic cell maintenance, including: a screw, a nut, and a sleeve assembly. The sleeve assembly includes: a flange and a sleeve welded below the flange. The lower end of the screw is arranged in the positioning hole of the component to be disassembled. The sleeve is arranged between the screw and the hole wall of the positioning hole of the component to be disassembled. The nut is sleeved on the screw and is located above the flange. The bottom of the screw is provided with a tapered base that is narrow at the top and wide at the bottom. The bottom of the sleeve is provided with a conical surface that matches the tapered base of the screw. The sleeve assembly is divided into several sleeve assembly segments along the circumferential direction, and a gap is formed between every two adjacent sleeve assembly segments.

[0005] Preferably, the tooling for electrolytic cell maintenance in the present invention is further provided as: the taper of the tapered base and the conical surface is 45°.

[0006] Preferably, the tooling for electrolytic cell maintenance in the present invention is further provided as: the gap formed between every two adjacent sleeve assembly segments is ≥2 mm.

[0007] Preferably, the tooling for electrolytic cell maintenance in the present invention is further configured as follows: the component to be disassembled includes an upper end plate, an insulating plate, and a single cell located above the damaged single cell.

[0008] Preferably, the tooling for electrolytic cell maintenance in the present invention is further configured as follows: several lifting rings are provided above the upper end plate.

[0009] Preferably, the tooling for electrolytic cell maintenance in the present invention is further configured as follows: the number of the sleeve component segments is two.

[0010] Preferably, the tooling for electrolytic cell maintenance in the present invention is further configured as follows: the circumferential component force of the pre-tightening force applied by the nut to the sleeve component ≥ 4 times the weight of the component to be disassembled.

[0011] Preferably, the tooling for electrolytic cell maintenance in the present invention is further configured as follows: the material of the sleeve is stainless steel.

[0012] Preferably, the tooling for electrolytic cell maintenance in the present invention is further configured as follows: the material of the screw is high-strength alloy steel.

[0013] To achieve the above object, another technical solution adopted by the present invention is: a method for maintaining an electrolytic cell, including the following steps: A. First, insert the screw into the positioning hole of the component to be disassembled; B. Then, respectively insert several sleeve component segments from above the positioning hole between the screw and the hole wall of the positioning hole of the component to be disassembled; C. Then, sleeved the nut on the screw and make the lower part of the nut abut against the flange of the sleeve component, and then tighten the nut. The nut provides a pre-tightening force for the sleeve component. Since the conical surface at the bottom of the sleeve and the conical base at the bottom of the screw form a self-locking structure through the inclined surface fit, a circumferential component force will be generated at the conical surface at the bottom of the sleeve by the pre-tightening force, and this circumferential component force ≥ 4 times the weight of the component to be disassembled. Under the action of this circumferential component force, the component to be disassembled can be prevented from falling due to gravity; D. Then, use several lifting rings fixed on the upper end plate of the component to be disassembled to lift the component to be disassembled and the tooling as a whole, and then repair the damaged single cell. After the repair, lift the component to be disassembled and the tooling as a whole and put it back above the repaired single cell, and finally remove the tooling.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By adopting the tooling and method in the present invention, the upper end plate, the insulating plate, and the single cell above the damaged single cell can be formed into an integral part for installation and disassembly, avoiding the piece-by-piece installation and disassembly in the prior art, thus avoiding the misalignment of the anode and cathode plates and the overall scrapping of the PEM membrane. At the same time, the maintenance efficiency is greatly improved and the maintenance cost is reduced.

Description of the Drawings

[0015] Figure 1This is a schematic structural diagram of the tooling for electrolytic cell maintenance in the present invention.

[0016] Figure 2 This is a schematic structural diagram of the screw rod in the present invention.

[0017] Figure 3 This is a top view structural schematic diagram of the sleeve assembly in the present invention.

[0018] Figure 4 This is a schematic structural diagram of a single sleeve assembly segment in the present invention.

[0019] Figures 1 to 4 In the figure: 1. Screw rod, 10. Conical base, 2. Nut, 3. Sleeve assembly, 30. Flange, 31. Sleeve, 310. Tapered surface, 32. Sleeve assembly segment, 33. Gap, 4. Component to be disassembled, 40. Positioning hole, 41. Upper end plate, 42. Insulating plate, 43. Single cell.

Specific Embodiment

[0020] The following further describes in detail a tooling for electrolytic cell maintenance and a method for maintaining an electrolytic cell using this tooling according to the present invention through specific embodiments.

[0021] Refer Figures 1 to 4 As shown in the figure, a tooling for electrolytic cell maintenance includes: a screw rod 1, a nut 2 and a sleeve assembly 3. The sleeve assembly 3 includes: a flange 30 and a sleeve 31 welded below the flange 30. The lower end of the screw rod 1 is arranged in the positioning hole 40 of the component to be disassembled 4. The component to be disassembled 4 includes an upper end plate 41, an insulating plate 42 and a single cell 43 located above the damaged single cell. Several lifting rings (not shown) are provided above the upper end plate 41. The sleeve 31 is arranged between the screw rod 1 and the hole wall of the positioning hole 40 of the component to be disassembled 4. The nut 2 is sleeved on the screw rod 1 and located above the flange 30. The circumferential component of the pre-tightening force applied by the nut 2 to the sleeve assembly 3 ≥ 4 times the weight of the component to be disassembled 4. The bottom of the screw rod 1 is provided with a conical base 10 that is narrower at the top and wider at the bottom. The bottom of the sleeve 31 is provided with a tapered surface 310 that cooperates with the conical base 10 of the screw rod 1. In this embodiment, the taper of the conical base 10 of the screw rod 1 and the bottom tapered surface 310 of the sleeve 31 is 45°. The outer diameter of the flange 30 is 25 mm, the outer diameter of the sleeve 31 is 15 mm, the inner diameter of the sleeve 31 is 10 mm, the large end diameter of the tapered surface of the conical base 10 is 15 mm, the small end diameter of the tapered surface of the conical base 10 is 10 mm. The material of the sleeve 31 is stainless steel, so it has good corrosion resistance. The material of the screw rod 1 is high-strength alloy steel. The length of the sleeve 31 is designed according to the distance from the damaged single cell to the upper surface of the upper end plate.

[0022] The casing assembly 3 is circumferentially divided into several casing assembly segments 32. A gap 33 is formed between every two adjacent casing assembly segments 32, and the gap 33 formed between every two adjacent casing assembly segments 32 is ≥ 2 mm, so as to facilitate the insertion of the casing assembly segment 32 between the screw 1 and the hole wall of the positioning hole 40 of the component to be disassembled 4. In this embodiment, the number of the casing assembly segments 32 is two, forming a symmetrical split structure. Of course, in other embodiments, the number of the casing assembly segments 32 can also be three or four, and the present invention can also be realized.

[0023] A method for repairing an electrolytic cell includes the following steps: A. First, insert the screw 1 into the positioning hole 40 of the component to be disassembled 4; B. Then, respectively insert several casing assembly segments 32 between the screw 1 and the hole wall of the positioning hole 40 of the component to be disassembled 4 from above the positioning hole 40; C. Then, sleuth the nut 2 on the screw 1 and make the lower part of the nut 2 abut against the flange 30 of the casing assembly 3. Then, tighten the nut 2. The nut 2 provides a pre-tightening force for the casing assembly 3. Since the conical surface 310 at the bottom of the casing 31 and the conical base 10 at the bottom of the screw 1 form a self-locking structure through the inclined surface fit, a circumferential component force will be generated at the conical surface 310 at the bottom of the casing 31 under the action of the pre-tightening force, and this circumferential component force is ≥ 4 times the weight of the component to be disassembled 4. Under the action of this circumferential component force, the component to be disassembled 4 can be prevented from falling due to gravity; D. Then, use several lifting rings fixed on the upper end plate 41 of the component to be disassembled 4 to lift the component to be disassembled 4 together with the tooling as a whole. Then, repair the damaged single cell. After the repair, lift the component to be disassembled 4 together with the tooling as a whole and place it back above the repaired single cell. Finally, remove the tooling.

[0024] In summary, by adopting the tooling and method in the present invention, the upper end plate, the insulating plate and the single cell above the damaged single cell can be formed into an integral part for installation and disassembly, avoiding the piece-by-piece installation and disassembly in the prior art, thereby avoiding the misalignment of the anode and cathode plates and the overall scrapping of the PEM membrane. At the same time, the repair efficiency is greatly improved and the repair cost is reduced.

[0025] The above embodiments only illustratively explain the principle and efficacy of the present invention and some applied embodiments, rather than limiting the present invention. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A tool for electrolytic cell maintenance, characterized in that: include: A screw, nut and sleeve assembly, the sleeve assembly comprising: a flange and a sleeve welded to the bottom of the flange, the lower end of the screw is arranged in the positioning hole of the disassembled component, the sleeve is arranged between the screw and the wall of the positioning hole of the disassembled component, the nut is sleeved on the screw and located above the flange, the bottom of the screw is provided with a conical base which is narrow at the top and wide at the bottom, the bottom of the sleeve is provided with a conical surface which matches the conical base of the screw, and the sleeve assembly is divided into several sleeve assembly segments along the circumferential direction, and a gap is formed between every two adjacent sleeve assembly segments.

2. The electrolytic cell maintenance tool as claimed in claim 1, characterized in that: The taper of the conical base and the conical surface is 45°.

3. The electrolytic cell maintenance tool as claimed in claim 1, characterized in that: The gap formed between each two adjacent sleeve assembly sections is ≥2mm.

4. The electrolytic cell maintenance tool according to claim 1, characterized in that: The disassembled assembly includes an upper end plate located above the damaged single cell, an insulating plate and the single cell.

5. The electrolytic cell maintenance tool as claimed in claim 4, characterized in that: A plurality of hanging rings are arranged above the upper end plate.

6. The electrolytic cell maintenance tool as claimed in claim 1, characterized in that: The number of the casing assembly segments is two.

7. The electrolytic cell maintenance tool according to claim 1, characterized in that: The circumferential component of the pre-tightening force applied by the nut to the sleeve assembly is ≥ 4 times the weight of the disassembled assembly.

8. The electrolytic cell maintenance tool as claimed in claim 1, characterized in that: The material of the sleeve is stainless steel.

9. The electrolytic cell maintenance tool as claimed in claim 1, characterized in that: The material of the screw is high-strength alloy steel.

10. A method for repairing an electrolytic cell using the electrolytic cell repair tool as described in any one of claims 1 to 9, characterized in that: The steps include: A. First, insert the screw into the positioning hole of the component to be disassembled; B. Then, insert several sleeve assembly segments from above the positioning hole into the space between the screw and the hole wall of the positioning hole of the disassembled assembly; C. Then put the nut on the screw and make the bottom of the nut abut against the flange of the casing assembly, then tighten the nut. The nut provides pre-tightening force for the casing assembly. Since the conical surface at the bottom of the casing and the conical base at the bottom of the screw fit together through the inclined surface to form a self-locking structure, the pre-tightening force will generate a circumferential component force at the conical surface at the bottom of the casing. The circumferential component force is ≥ 4 times the weight of the disassembled component. Under the action of the circumferential component force, the disassembled component can be prevented from falling due to gravity; D. Then use several lifting rings fixed on the upper end plate of the disassembled component to lift the disassembled component together with the tooling, and then repair the damaged single battery. After the repair, the disassembled component together with the tooling is lifted back and placed above the repaired single battery, and finally the tooling is removed.

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