Polar plate fixing device and electrochemical equipment

By combining conductive busbars, connecting rods, and conductive sheets, the problem of poor conductivity in the anode plate fixing device is solved, thereby improving energy utilization and extending service life.

CN223852805UActive Publication Date: 2026-01-30GUANGXI CNGR NEW ENERGY SCI & TECH CO LTD +1
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202520172058.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-01-24
Publication Date
2026-01-30
Estimated Expiration
2035-01-24

AI Technical Summary

Technical Problem

The existing anode plate fixing device has poor conductivity and low power utilization.

Method used

The system employs a combination structure of conductive busbars, connecting rods, and conductive sheets to increase the conductive path, and enhances connection stability and conductivity through components such as conductive fasteners and limit nuts.

Benefits of technology

It improves conductivity, enhances energy efficiency, extends service life, and reduces current loss.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN223852805U_ABST
    Figure CN223852805U_ABST
Patent Text Reader

Abstract

The utility model discloses a pole plate fixing device and electrochemical equipment, the pole plate fixing device comprises a conducting bar, a connecting assembly and a conducting assembly, the connecting assembly comprises a connecting rod, and the connecting rod penetrates through the conducting bar and is used for being connected with a pole plate; the conductive assembly comprises a conductive sheet, the conductive sheet comprises a mounting part and a conductive part connected with the mounting part, the mounting part is connected to the conductive bar, and the conductive part is connected with the connecting rod. In the polar plate fixing device, the conducting bar and the connecting rod are connected through the conducting strip, so that a conducting path is increased, the current flowing through the conducting bar can be conducted to the polar plate through the conducting strip and the connecting rod, the conducting performance is enhanced, and the utilization rate of electric energy is improved.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] This utility model belongs to the field of electrochemical technology, specifically relating to an electrode plate fixing device and an electrochemical device. Background Technology

[0002] In the electrolysis of metal salts, current is usually applied to the anode plate after passing through the anode plate fixing device to carry out electrolysis.

[0003] However, existing anode plate fixing devices often suffer from low current entering the anode plate and high power loss. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies, this utility model provides an electrode plate fixing device and an electrochemical device, aiming to solve the technical problems of poor conductivity and low power utilization of existing anode plate fixing devices.

[0005] To achieve the above objectives, this utility model provides an electrode plate fixing device, comprising:

[0006] Conductive busbar;

[0007] A connecting assembly, including a connecting rod that passes through a conductive bar and is configured to connect to an electrode plate;

[0008] A conductive component includes a conductive sheet, the conductive sheet includes a mounting part and a conductive part connected to the mounting part, the mounting part is connected to a conductive busbar, and the conductive part is connected to a connecting rod.

[0009] In this embodiment of the invention, a conductive busbar is used to connect to a power source. A connecting rod passes through the conductive busbar and connects to the electrode plate. The mounting portion of the conductive sheet is connected to the conductive busbar, and the conductive portion is connected to the connecting rod. The power source supplies power to the conductive busbar, enabling the conductive busbar to conduct electricity to the electrode plate through the connecting rod. The conductive busbar can also conduct current to the conductive portion through the mounting portion, allowing the conductive portion to conduct current to the connecting rod, and then to the electrode plate through the connecting rod. In the electrode plate fixing device of this invention, the conductive busbar and the connecting rod are connected by a conductive sheet, increasing the conductive path. This allows the current flowing through the conductive busbar to be conducted to the electrode plate through the conductive sheet and the connecting rod, enhancing conductivity and improving energy utilization.

[0010] In this embodiment of the utility model, there are two mounting parts, which are respectively located at both ends of the conductive part. The conductive part is located on the side of the conductive busbar facing away from the electrode plate. The connecting rod is located between the two mounting parts, and a through hole is provided on the conductive part for the connecting rod to pass through.

[0011] In this embodiment of the utility model, the conductive component further includes conductive fasteners. The mounting part is connected to the conductive busbar through the conductive fasteners. The number of conductive fasteners is consistent with the number of mounting parts and is set in a one-to-one correspondence.

[0012] And / or, the connecting assembly also includes a limiting nut, which is threaded to the connecting rod and located on the side of the conductive part facing away from the conductive busbar, and the limiting nut is made of titanium.

[0013] In this embodiment of the invention, the connecting assembly further includes an adjusting nut, which is threadedly connected to the connecting rod and located on the side of the conductive busbar facing away from the electrode plate.

[0014] In this embodiment of the invention, the connecting assembly further includes an adapter plate, which is located at the end of the connecting rod away from the adjusting nut, and the connecting rod is connected to the electrode plate through the adapter plate.

[0015] In this embodiment of the utility model, a slot is provided at the end of the connecting rod away from the adjusting nut, one end of the adapter plate extends into the slot and is connected to the connecting rod, and the other end of the adapter plate is connected to the electrode plate;

[0016] And / or, the connecting rod and adapter plate are both made of titanium.

[0017] In this embodiment of the utility model, the mounting part is integrally formed on the conductive part, and both the mounting part and the conductive part are made of copper.

[0018] In this embodiment of the invention, the connecting assembly further includes a fastening nut, which is threadedly connected to the connecting rod and located on the side of the conductive busbar facing the electrode plate.

[0019] In this embodiment of the utility model, the conductive bus is made of copper, and an anti-corrosion layer is provided on the conductive bus. The anti-corrosion layer is a titanium coating, and the two ends of the anti-corrosion layer have conductive notches.

[0020] And / or, the number of connecting rods is set to multiple, and the multiple connecting rods are spaced apart along the length direction of the conductive busbar. The number of conductive sheets is the same as the number of connecting rods and they are set in a one-to-one correspondence.

[0021] To achieve the above objectives, this utility model provides an electrochemical device, which includes an electrode fixing device as described above.

[0022] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0024] Figure 1 This is a schematic diagram of the structure of an electrode plate fixing device according to an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 Enlarged view of region A in the middle;

[0026] Figure 3 This is a schematic diagram of the conductive busbar and conductive components in an electrode plate fixing device according to an embodiment of the present invention;

[0027] Figure 4 This is a structural schematic diagram of the connecting component in an electrode plate fixing device according to an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures

[0029] 100 Conductive busbar 250 Fastening nut

[0030] 110 Corrosion-resistant layer 300 Conductive components

[0031] 111 Conductive notch 310 Conductive sheet

[0032] 200 Connection Components 311 Mounting Section

[0033] 210 Connecting rod 312 Conductive part

[0034] 211 Slot 313 Through Hole

[0035] 220 Limit Nut; 320 Conductive Fastener

[0036] 230 Adjusting nut 400 Electrode plate

[0037] 240 adapter plate Detailed Implementation

[0038] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0039] The electrode plate fixing device of this utility model is described below with reference to the accompanying drawings.

[0040] like Figure 1 and Figure 2 As shown, this utility model provides an electrode plate fixing device, which includes a conductive busbar 100, a connecting component 200, and a conductive component 300. The connecting component 200 includes a connecting rod 210, which passes through the conductive busbar 100 and is used to connect with the electrode plate 400. The conductive component 300 includes a conductive sheet 310, which includes a mounting part 311 and a conductive part 312 connected to the mounting part 311. The mounting part 311 is connected to the conductive busbar 100, and the conductive part 312 is connected to the connecting rod 210.

[0041] It should be noted that the electrode fixing device of this utility model can be used in electrochemical equipment to fix and install electrode 400 and conduct electricity to electrode 400 for electrolytic reaction. The electrode 400 can be an anode plate or a cathode plate. The electrolytic reaction includes electrolytic deposition, electrolytic refining or electrolytic extraction, etc. The embodiments of this utility model do not limit the type of electrode 400 or the type of electrolytic reaction of the electrochemical equipment.

[0042] Specifically, in this embodiment of the invention, the conductive busbar 100 is a group of metal conductors, generally rod-shaped, used to support and fix other objects, and to bear and transmit loads. In some embodiments, the conductive busbar 100 is also called a busbar or conductive beam, etc., and when the metal conductor is copper, it is also called a copper busbar. The conductive busbar 100 is used to connect to a power source and conduct current. The upper end of the connecting rod 210 passes through the conductive busbar 100 and is connected to it. The electrode plate 400 is connected to the lower end of the connecting rod 210. The mounting portion 311 of the conductive sheet 310 is mounted on the conductive busbar 100. The conductive portion 312 of the conductive sheet 310 extends from the mounting portion 311 in a direction away from the conductive busbar 100 and is connected to the connecting rod 210. The power source supplies power to the conductive busbar 100, so that the current flowing through the conductive busbar 100 can be directly conducted from the conductive busbar 100 to the connecting rod 210. The current can also be conducted from the conductive busbar 100 to the mounting part 311 and then to the connecting rod 210 via the conductive part 312. The connecting rod 210 conducts the current to the electrode plate 400 for electrolysis. In this embodiment of the invention, the electrode plate fixing device connects the conductive busbar 100 and the connecting rod 210 via the conductive sheet 310, increasing the conductive path between the conductive busbar 100 and the connecting rod 210. This allows the current flowing through the conductive busbar 100 to be conducted to the electrode plate 400 via the conductive sheet 310 and the connecting rod 210, thereby enhancing conductivity and improving energy utilization.

[0043] In this embodiment of the present invention, the number of mounting portions 311 of the conductive sheet 310 is set to two, and the two mounting portions 311 are respectively located at both ends of the conductive portion 312. The conductive portion 312 is located on the side of the conductive busbar 100 facing away from the electrode plate 400. The connecting rod 210 is located between the two mounting portions 311, and a through hole 313 is provided on the conductive portion 312 for the connecting rod 210 to pass through.

[0044] like Figure 2 and Figure 3 As shown, the two ends of the conductive part 312 are respectively connected to two mounting parts 311 one-to-one. Both mounting parts 311 are connected to the conductive bus 100. The conductive part 312 has a through hole 313. The connecting rod 210 extends into the through hole 313 and is connected to the conductive part 312. The current on the conductive bus 100 can be directly conducted to the connecting rod 210, or it can be conducted to the conductive part 312 through the two mounting parts 311 and then to the connecting rod 210, which increases the conductive path and reduces the current. The resistance is reduced, which increases the current conducted from the conductive busbar 100 to the connecting rod 210, thereby enhancing the conductivity of the electrode plate 400. Furthermore, since the electrode plate 400 generates corrosive gases during the electrolytic reaction, the electrode fixing device, by placing the conductive part 312 at the upper end of the conductive busbar 100 and the electrode plate 400 below the conductive busbar 100, allows the conductive busbar 100 to block the corrosive gases generated by the electrolytic reaction, reducing the contact between the conductive part 312 and the corrosive gases, and extending the service life of the conductive part 312.

[0045] In this embodiment of the utility model, the conductive component 300 further includes a conductive fastener 320. The mounting part 311 is connected to the conductive busbar 100 through the conductive fastener 320. The number of conductive fasteners 320 is consistent with the number of mounting parts 311 and they are set one-to-one.

[0046] like Figure 2 and Figure 3 As shown, the conductive fastener 320 passes through the mounting part 311 and extends into the conductive busbar 100 to connect with the conductive busbar 100. This allows the current flowing through the conductive busbar 100 to be conducted along the conductive fastener 320 to the mounting part 311, and then sequentially through the mounting part 311, the conductive part 312, and the connecting rod 210 to the electrode plate 400. During the conduction process, the conductive fastener 320 can conduct the current inside the conductive busbar 100 to the conductive sheet 310, further enhancing conductivity and improving energy utilization.

[0047] In one embodiment of this utility model, the conductive fastener 320 is made of titanium, which gives the connecting rod 210 and the adapter piece 240 made of titanium good corrosion resistance and conductivity, thus extending their service life.

[0048] In another embodiment of this utility model, the conductive fastener 320 is made of copper. The copper conductive fastener 320 has strong conductivity, which further enhances the conductivity. In addition, the conductive fastener 320 is coated with a titanium coating, which improves the corrosion resistance of the conductive fastener 320.

[0049] Furthermore, the connecting assembly 200 also includes a limiting nut 220, which is threadedly connected to the connecting rod 210 and located on the side of the conductive part 312 facing away from the conductive busbar 100. The limiting nut 220 is made of titanium. Figure 2 and Figure 3 As shown, the limiting nut 220 is sleeved on the connecting rod 210, and the limiting nut 220 abuts against the upper side of the conductive part 312 to limit the conductive part 312, thereby enhancing the connection strength between the conductive part 312 and the connecting rod 210 and improving the conductivity reliability.

[0050] In this embodiment of the invention, the connecting assembly 200 further includes an adjusting nut 230, which is threadedly connected to the connecting rod 210 and located on the side of the conductive busbar 100 facing away from the electrode plate 400. Figure 2 and Figure 4 As shown, the conductive part 312 is raised in a direction away from the conductive busbar 100. The adjusting nut 230 is located between the conductive part 312 and the conductive busbar 100 and is supported on the upper side of the conductive busbar 100. The adjusting nut 230 is threadedly connected to the connecting rod 210 to connect the connecting rod 210 to the conductive busbar 100. By rotating the adjusting nut 230, the extension length of the lower end of the connecting rod 210 relative to the conductive busbar 100 can be adjusted, thereby adjusting the distance between the electrode plate 400 and the conductive busbar 100. In the case of corrosive gas generated by the electrolysis reaction, rotating the adjusting nut 230 increases the distance between the electrode plate 400 and the conductive busbar 100, reduces the contact between the conductive busbar 100 and the corrosive gas, and increases the service life of the conductive busbar 100.

[0051] Furthermore, the connecting assembly 200 also includes a fastening nut 250, which is threadedly connected to the connecting rod 210 and located on the side of the conductive busbar 100 facing the electrode plate 400. Figure 2 and Figure 4 As shown, the fastening nut 250 is sleeved on the connecting rod 210 and abuts against the lower side of the conductive busbar 100. The fastening nut 250, in conjunction with the adjusting nut 230, limits the position of the conductive busbar 100 relative to the connecting rod 210, thereby fixing the position of the conductive busbar 100 relative to the connecting rod 210 and improving connection stability and structural reliability. Furthermore, by rotating the adjusting nut 230 and the fastening nut 250, the extension length of the lower end of the connecting rod 210 relative to the conductive busbar 100 can be adjusted, thus realizing the adjustment of the distance between the electrode plate 400 and the conductive busbar 100, which is flexible and convenient.

[0052] In this embodiment of the invention, the connecting assembly 200 further includes an adapter piece 240, which is located at the end of the connecting rod 210 away from the adjusting nut 230, and the connecting rod 210 is connected to the electrode plate 400 through the adapter piece 240. Figure 2 and Figure 4 As shown, the lower end of the connecting rod 210 is provided with an adapter piece 240. The electrode plate 400 is connected to the adapter piece 240. The adapter piece 240 increases the contact area with the electrode plate 400, which not only facilitates the connection but also increases the connection strength and improves the connection stability.

[0053] Furthermore, a groove 211 is provided at the end of the connecting rod 210 away from the adjusting nut 230. One end of the adapter piece 240 extends into the groove 211 and connects to the connecting rod 210, while the other end of the adapter piece 240 is connected to the electrode plate 400; Figure 2 and Figure 4 As shown, a slot 211 is provided at the lower end of the connecting rod 210. The upper end of the adapter piece 240 extends into the slot 211 and connects with the connecting rod 210 to connect the adapter piece 240 to the lower end of the connecting rod 210. The adapter piece 240 can be connected to the connecting rod 210 by welding, bonding or other connection processes, and the connection is stable and reliable. The lower end of the adapter piece 240 is connected to the electrode plate 400, which increases the contact area and further improves the connection stability.

[0054] In this embodiment of the utility model, both the connecting rod 210 and the adapter piece 240 are made of titanium. The titanium connecting rod 210 and the adapter piece 240 have good corrosion resistance and conductivity, which extends their service life.

[0055] In this embodiment of the invention, the mounting portion 311 is integrally formed on the conductive portion 312. Both the mounting portion 311 and the conductive portion 312 are made of copper, and the thickness of both the mounting portion 311 and the conductive portion 312 is 1mm to 4mm. Figure 2 and Figure 3 As shown, the conductive sheet 310 is a one-piece molded part, which has the advantages of easy manufacturing, saving assembly steps and eliminating assembly errors. Moreover, the conductive sheet 310 is made of copper, which has strong conductivity, further enhancing the conductivity. In addition, if the thickness of the conductive sheet 310 is less than 1mm, it will be prone to deformation. If the thickness of the conductive sheet 310 is greater than 4mm, the resistance of the conductive sheet 310 will increase, affecting the conductivity. The thickness of the conductive sheet 310 is set to 1mm to 4mm, which ensures the structural strength of the conductive sheet 310, effectively prevents deformation, and has good conductivity, thus improving the energy utilization rate.

[0056] In this embodiment of the invention, the conductive bus 100 is made of copper. The copper conductive bus 100 has strong conductivity, improving energy utilization. Furthermore, as... Figure 1 and Figure 3 As shown, the conductive bus 100 is provided with an anti-corrosion layer 110, which is a titanium coating. The anti-corrosion layer 110 has conductive notches 111 at both ends. The anti-corrosion layer 110 is coated on the outside of the conductive bus 100 to prevent the copper conductive bus 100 from being exposed to corrosive gases, thereby improving the durability of the conductive bus 100. The conductive notches 111 at both ends of the anti-corrosion layer 110 expose the two ends of the conductive bus 100. The two ends of the conductive bus 100 are respectively connected to a power source and an insulator. The power source can be directly connected to the copper conductive bus 100. The copper conductive bus 100 has stronger conductivity than the titanium anti-corrosion layer 110, thus enhancing the conductivity.

[0057] In this embodiment of the utility model, the number of connecting rods 210 is set to multiple, and the multiple connecting rods 210 are spaced apart along the length direction of the conductive busbar 100. The number of conductive sheets 310 is the same as the number of connecting rods 210 and they are arranged in a one-to-one correspondence. Figure 1 As shown, multiple connecting rods 210 are spaced apart and connected to the conductive busbar 100. The lower ends of the multiple connecting rods 210 are used to connect to the electrode plate 400, which improves the connection stability and effectively prevents the electrode plate 400 from loosening or falling off. Each connecting rod 210 is connected to the conductive busbar 100 through a conductive sheet 310. The conductive busbar 100 can conduct electricity directly to the multiple connecting rods 210, and can also conduct electricity to the corresponding connecting rod 210 through each conductive sheet 310. This increases the conductivity path and reduces the conductivity resistance, thereby improving conductivity and energy utilization.

[0058] In addition, this utility model also provides an electrochemical device, which includes an electrode fixing device according to the above description. The specific structure of the electrode fixing device is as described in the above embodiments. Since the electrochemical device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0059] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A plate fixation device, characterized in that, The polar plate fixing device comprises: a conductive row (100); a connecting assembly (200) comprising a connecting rod (210) arranged through the conductive row (100) and used for connecting with a polar plate (400); a conductive assembly (300) comprising a conductive sheet (310) comprising a mounting portion (311) connected to the conductive row (100) and a conductive portion (312) connected to the mounting portion (311), wherein the conductive portion (312) is connected to the connecting rod (210).

2. The polar plate securing device according to claim 1, characterized in that The number of the mounting portions (311) is two, and the two mounting portions (311) are respectively arranged at two ends of the conductive portion (312), the conductive portion (312) is located on a side of the conductive row (100) away from the polar plate (400), the connecting rod (210) is located between the two mounting portions (311), and a through hole (313) is arranged on the conductive portion (312) for the connecting rod (210) to pass through.

3. The polar plate securing apparatus of claim 2, wherein The conductive assembly (300) further comprises conductive fasteners (320), the mounting portions (311) are connected to the conductive row (100) through the conductive fasteners (320), and the number of the conductive fasteners (320) is consistent with and one-to-one corresponds to the number of the mounting portions (311). And / or, the connecting assembly (200) further comprises a limiting nut (220), the limiting nut (220) is threadedly connected to the connecting rod (210) and located on a side of the conductive portion (312) away from the conductive row (100), and the limiting nut (220) is made of titanium.

4. The polar plate securing apparatus of claim 1, wherein The connecting assembly (200) further comprises an adjusting nut (230), the adjusting nut (230) is threadedly connected to the connecting rod (210) and located on a side of the conductive row (100) away from the polar plate (400).

5. The polar plate securing apparatus of claim 4, wherein The connecting assembly (200) further comprises an adapter sheet (240), the adapter sheet (240) is arranged at an end of the connecting rod (210) away from the adjusting nut (230), and the connecting rod (210) is connected to the polar plate (400) through the adapter sheet (240).

6. The polar plate securing apparatus of claim 5, wherein An end of the connecting rod (210) away from the adjusting nut (230) is provided with a clamping groove (211), one end of the adapter sheet (240) is inserted into the clamping groove (211) and connected to the connecting rod (210), and the other end of the adapter sheet (240) is connected to the polar plate (400). And / or, the connecting rod (210) and the adapter sheet (240) are both made of titanium.

7. The polar plate securing apparatus according to any one of claims 1 to 6, characterized by The mounting portion (311) is integrally formed on the conductive portion (312), and the mounting portion (311) and the conductive portion (312) are both made of copper.

8. The polar plate securing apparatus according to any one of claims 1 to 6, characterized by The connecting assembly (200) further comprises a fastening nut (250) which is threadedly connected with the connecting rod (210) and located on the side of the conductive bar (100) facing the polar plate (400).

9. The polar plate securing apparatus according to any one of claims 1 to 6, characterized by The conductive bar (100) is made of copper material, and an anti-corrosion layer (110) is arranged on the conductive bar (100), the anti-corrosion layer (110) is a titanium material coating, and both ends of the anti-corrosion layer (110) have conductive notches (111). And / or, the number of the connecting rods (210) is set to be multiple, multiple connecting rods (210) are arranged along the length direction of the conductive bar (100) at intervals, and the number of the conductive sheets (310) is consistent with and one-to-one corresponds to the number of the connecting rods (210).

10. An electrochemical device, characterized by, The electrochemical device comprises the polar plate fixing device according to any one of claims 1 to 9.