Adjustable squeegee device for composite current collectors

Abstract

The utility model discloses a kind of adjustable squeeze water roller devices for composite current collector, belong to composite current collector technical field, comprising: two racks, movable squeeze water roller, at least one end of the movable squeeze water roller is movably installed between two the rack by adjusting assembly;Fixed squeeze water roller, the fixed squeeze water roller is arranged between two the rack, and the fixed squeeze water roller is below the movable squeeze water roller;Water collection mechanism, the water collection mechanism is arranged below the fixed squeeze water roller;Among them, the channel for passing through by composite current collector is formed between the movable squeeze water roller and the fixed squeeze water roller, and the adjusting assembly is used to control the end height of at least one end of the movable squeeze water roller.The utility model device height can be individually adjusted in movable squeeze water roller both sides, for the problem that one side squeeze water is not complete caused by the uneven surface of composite current collector, corresponding side squeeze water pressure can be independently controlled flexibly, and uniform removal composite current collector surface excess liquid.

Description

Technical Field

[0001] This utility model relates to an adjustable dewatering roller device for composite current collectors, belonging to the field of composite current collector production technology. Background Technology

[0002] Composite current collectors are multilayer composite films with specific functions. Their core employs a sandwich structure of "metal-polymer material-metal," with composite copper foil often used as the negative electrode in lithium-ion batteries. The mainstream method for preparing them is a two-step process combining magnetron sputtering and water plating. In this process, a polymer base film is first magnetron sputtered to obtain a sputtered film, which is then water-plated to obtain the composite current collector. The final critical step in the water plating process is drying. Before entering the drying tank, the composite current collector must be treated by a dewatering roller. Its core function is to uniformly remove excess plating solution adhering to the surface of the composite current collector, preventing residual liquid from affecting the drying effect and the final product performance.

[0003] In the wet production process of thin film materials such as composite current collectors, the dewatering effect of the dewatering roller directly determines the core quality indicators such as the surface smoothness and thickness consistency of the product.

[0004] However, existing dewatering rollers generally employ a fixed design, which has significant limitations: Firstly, when the composite current collector itself has uneven thickness, the fixed dewatering roller cannot adapt to the thickness variations, leading to an imbalance in the dewatering pressure distribution along the width of the composite current collector. Secondly, after long-term use, the dewatering roller inevitably develops cylindricity errors, further exacerbating the problem of uneven pressure distribution. Both of these issues can cause problems such as incomplete dewatering in certain areas, excessive squeezing damaging the substrate, or inconsistent thickness of the residual liquid film on the surface. Ultimately, these factors affect the conductivity, mechanical strength, and service life of the composite current collector, restricting the stability of the production process and the product qualification rate. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an adjustable dewatering roller device for composite current collectors.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] An adjustable dewatering roller device for a composite current collector includes: two frames; a movable dewatering roller, at least one end of which is movably mounted between the two frames via an adjusting component; a fixed dewatering roller disposed between the two frames and located below the movable dewatering roller; and a water collecting mechanism disposed below the fixed dewatering roller; wherein a channel for the composite current collector to pass through is formed between the movable dewatering roller and the fixed dewatering roller, and the adjusting component is used to control the end height of at least one end of the movable dewatering roller.

[0008] Preferably, both the movable dewatering roller and the fixed dewatering roller are provided with limiting components on both sides to prevent the composite current collector from shifting position.

[0009] Preferably, the adjustment assembly includes two T-shaped brackets, which are respectively fixedly installed at the middle of two frames on one side close to each other. The top of the T-shaped brackets is hinged to the middle of the double-arm lever. Hinges are installed on both sides of the double-arm lever. A cylinder is installed on the inner wall of the top of the frame. The output ends of the two cylinders are respectively connected to the top of the hinge on one side of the two double-arm lever. The bearing seats on both sides of the movable squeezing roller are slidably installed on the hinge on the other side of the two double-arm lever. The bearing seats on both sides of the fixed squeezing roller are respectively fixedly installed on one side of the bottom of the two T-shaped brackets.

[0010] Preferably, the output end of the cylinder is fixedly mounted via a pressure sensor and the top of a hinge bracket.

[0011] Preferably, the top of the frame is equipped with a pressure regulating valve and a pressure gauge connected to the air supply pipe of the cylinder.

[0012] Preferably, the limiting component includes two bottom grooves, which are respectively opened at the bottom middle of two T-shaped brackets. A screw is rotatably installed in the bottom groove. The outer side wall of the screw is provided with a screw seat by thread. The upper ends of the two screw seats on the side close to each other are each connected by a frame body. A limiting roller is rotatably installed between the upper and lower ends of the frame body.

[0013] Preferably, a connecting groove is provided on the side of the bottom of the T-shaped bracket away from the fixed squeezing roller, and a transmission rod is rotatably installed below the two frames. Synchronous pulleys are installed on the outer side wall of the transmission rod and the outer side wall of the screw that passes through the connecting groove. The two synchronous pulleys are driven by a synchronous belt.

[0014] Preferably, a limiting rod is installed in the bottom groove, and the screw seat and the limiting rod are slidably connected.

[0015] Preferably, the water collection mechanism includes a water collection tank, both sides of which are fixedly installed via U-shaped connecting frames and two machine frames, and the water collection tank is located between the fixed squeezing roller and the transmission rod.

[0016] Preferably, a filter screen is slidably installed inside the water collection tank, and the filter screen and the water collection tank are detachably installed via a fixing component.

[0017] Preferably, the fixing assembly includes two U-shaped plates that snap onto the top of the water collection tank. The bottom side of each of the two U-shaped plates is fixedly installed on both sides of the top of the filter screen. Multiple sliding rods are slidably installed on the other side of the U-shaped plates. One side of each sliding rod is connected to a pull plate. The pull plate and the U-shaped plate are connected by a spring. The other side of each sliding rod is connected to an insert plate. A storage groove for storing the insert plate is provided on the inner wall of one side of the U-shaped plate. A slot for inserting the insert plate is provided on the side wall of the frame.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. The movable squeezing roller is driven by a cylinder-driven double-arm lever, giving it micro-floating capability. This allows for flexible adaptation to composite current collectors with uneven thickness, preventing excessive or insufficient local pressure. Simultaneously, the height of each side of the movable squeezing roller can be adjusted independently. Addressing the issue of incomplete squeezing on one side due to uneven composite current collector surfaces, it independently controls the squeezing pressure on the corresponding side. This ensures uniform removal of excess liquid from the entire surface of the composite current collector while protecting it from damage. A pressure sensor at the cylinder output end monitors the squeezing pressure in real time, upgrading the traditional experience-based blind adjustment mode to precise digital display control. This not only ensures the consistency of the process for each batch of products but also enables traceability of pressure parameters, facilitating quality control and process optimization during production. Combined with a pressure regulating valve and pressure gauge, the cylinder input pressure can be intuitively controlled and displayed, further improving the accuracy of pressure regulation.

[0020] 2. The limiting components on both sides are engaged by the threaded transmission of the screw and screw seat, which allows for fine adjustment of the spacing between the limiting rollers and can adapt to composite current collectors of different widths. The limiting rollers contact the two sides of the composite current collector, effectively preventing deviation during the conveying process and ensuring that the composite current collector remains in the center position during the dewatering process, thereby improving the uniformity of dewatering and the dimensional stability of the product.

[0021] 3. The water collection tank located below the fixed squeezing roller efficiently collects the squeezed wastewater, preventing waste liquid from polluting the production environment and facilitating subsequent wastewater recycling and treatment. The filter screen inside the collection tank effectively filters impurities in the wastewater, improving the cleanliness of the recycled water and reducing water treatment costs. The filter screen is installed using a detachable fixing component; it can be quickly removed for cleaning by pulling the pull plate. During installation, a spring automatically resets the limit and fixes the screen, simplifying operation, reducing equipment downtime for maintenance, and lowering operating costs. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the adjustment component structure of this utility model;

[0025] Figure 3 This is a schematic diagram of the limiting component structure of this utility model;

[0026] Figure 4 This is a schematic diagram of the water collection mechanism of this utility model;

[0027] Figure 5 This is a schematic diagram of the fixing component structure of this utility model;

[0028] Figure 6 For the present utility model Figure 2 An enlarged schematic diagram of the structure at point A.

[0029] In the diagram: 1. Frame; 2. Adjustment assembly; 3. Movable squeezing roller; 4. Fixed squeezing roller; 5. Limiting assembly; 6. Water collection mechanism; 201. T-shaped bracket; 202. Double-arm lever; 203. Hinge frame; 204. Cylinder; 205. Pressure sensor; 206. Air pressure regulating valve; 207. Pressure gauge; 501. Bottom groove; 502. Screw; 503. Screw seat; 504. Connecting rod; 505. Frame; 506. Limiting roller; 507. Connecting groove; 508. Transmission rod; 509. Synchronous pulley; 5010. Synchronous belt; 601. Water collection tank; 602. U-shaped connecting frame; 603. Filter screen; 604. Fixing assembly; 6041. U-shaped plate; 6042. Slide rod; 6043. Pull plate; 6044. Spring; 6045. Insert plate; 6046. Slot. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figure 1 This utility model provides a technical solution:

[0032] An adjustable dewatering roller device for composite current collectors includes: two frames 1; a movable dewatering roller 3, at least one end of which is movably mounted between the two frames 1 via an adjusting component 2; a fixed dewatering roller 4, disposed between the two frames 1 and located below the movable dewatering roller 3; and a water collecting mechanism 6, disposed below the fixed dewatering roller 4. A channel for the composite current collector to pass through is formed between the movable dewatering roller 3 and the fixed dewatering roller 4, and the adjusting component 2 is used to control the end height of at least one end of the movable dewatering roller 3.

[0033] Furthermore, the two frames 1 are welded from Q235 steel plates to ensure the overall stability of the equipment; both the movable squeezing roller 3 and the fixed squeezing roller 4 are made of 304 stainless steel with mirror polishing to avoid scratching the surface of the composite current collector and reduce liquid residue; their axes are kept parallel, and the spacing can be adjusted by the adjustment component 2 to accommodate composite current collectors of different thicknesses; when squeezing water from the composite current collector, the movable squeezing roller 3 and the fixed squeezing roller 4 will rotate as the composite current collector moves.

[0034] Please see Figure 1-3 In this embodiment, both sides of the movable squeezing roller 3 and the fixed squeezing roller 4 are provided with limiting components 5 to prevent the composite current collector from shifting position.

[0035] Please see Figure 2 and Figure 6In this embodiment: the adjustment component 2 includes two T-shaped brackets 201, which are respectively fixedly installed at the middle of the two frames 1 on the side close to each other. The top of the T-shaped brackets 201 is hinged to the middle of the double-arm lever 202. The double-arm lever 202 is equipped with hinge frames 203 on both sides. The top inner wall of the frame 1 is equipped with cylinders 204. The output ends of the two cylinders 204 are respectively connected to the top of the hinge frames 203 on one side of the two double-arm levers 202. The bearing seats on both sides of the movable squeezing roller 3 are slidably installed on the hinge frames 203 on the other side of the two double-arm levers 202. The bearing seats on both sides of the fixed squeezing roller 4 are respectively fixedly installed on one side of the bottom of the two T-shaped brackets 201.

[0036] Furthermore, the hinge frame 203 near both ends of the movable squeezing roller 3 is provided with a sliding groove, and a sliding seat is slidably installed in the sliding groove. The bearing seats on both sides of the movable squeezing roller 3 are fixedly installed with the two sliding seats respectively, so that the movable squeezing roller 3 can slide horizontally. The T-shaped bracket 201 is made by an integrated casting process, and a copper sleeve is inlaid at the hinge to reduce the wear when the double arm lever 202 rotates. That is, the force of the cylinder 204 output end is amplified by 2 times by the lever and then transmitted to the movable squeezing roller 3. The hinge frame 203 and the double arm lever 202 are connected by a pin. The surface of the pin is coated with molybdenum-based grease to ensure flexible rotation and avoid jamming.

[0037] Please see Figure 2 In this embodiment: the output end of cylinder 204 is fixedly installed through pressure sensor 205 and the top of hinge bracket 203.

[0038] Furthermore, the pressure sensor 205 is used to detect in real time the force applied by the cylinder 201 to the movable squeezing roller 3 through the double-arm lever 202, so as to ensure that the pressure feedback is lag-free; the sensor is equipped with a dust cover to prevent water splashes or dust from affecting the detection accuracy.

[0039] Please see Figure 2 In this embodiment: a pressure regulating valve 206 and a pressure gauge 207 connected to the air supply pipe of cylinder 204 are installed on the top of the frame 1.

[0040] Furthermore, the air pressure regulating valve 206 adopts a precision pressure reducing valve to stably control the air supply line pressure of the cylinder; the pressure gauge 207 is a shock-resistant type, which makes it easy for operators to read the real-time air pressure intuitively.

[0041] Please see Figure 3In this embodiment: the limiting component 5 includes two bottom grooves 501, which are respectively opened at the bottom middle of the two T-shaped brackets 201. A screw 502 is rotatably installed in the bottom groove 501. A screw seat 503 is provided on the outer side wall of the screw 502 through threads. A frame 505 is installed at both ends of the two screw seats 503 on the side closer to each other through a connecting rod 504. A limiting roller 506 is rotatably installed between the upper and lower ends of the frame 505.

[0042] Furthermore, the screw 502 adopts a trapezoidal thread and is galvanized for rust prevention. The limit roller 506 is made of polyurethane, which has a certain degree of elasticity to fit the edge of the substrate and avoids scratching the substrate.

[0043] Please see Figure 3 In this embodiment: a connecting groove 507 is provided on the side of the bottom of the T-shaped bracket 201 away from the fixed squeezing roller 4. A transmission rod 508 is rotatably installed below the two frames 1. Synchronous pulleys 509 are installed on the outer side wall of the transmission rod 508 and the outer side wall of the screw 502 that passes through the connecting groove 507. The two synchronous pulleys 509 are driven by a synchronous belt 5010.

[0044] Furthermore, one end of the transmission rod 508 extends out of the frame 1 and connects to the output end of the servo motor. The servo motor is mounted on the frame 1 via a motor frame and drives the screws 502 on both sides to rotate synchronously via the synchronous pulley 509 and the synchronous belt 5010, thereby realizing the synchronous adjustment of the distance between the limit rollers 506 on both sides and adapting to composite current collectors of different widths. The synchronous belt 5010 is a polyurethane synchronous belt with an MXL tooth profile to ensure that there is no slippage during transmission.

[0045] Please see Figure 3 In this embodiment: a limiting rod is installed in the bottom groove 501, and the screw seat 503 and the limiting rod are slidably connected.

[0046] Furthermore, the limiting rod is made of No. 45 steel and limits the screw seat 503.

[0047] Please see Figure 4 In this embodiment: the water collection mechanism 6 includes a water collection tank 601. Both sides of the water collection tank 601 are fixedly installed through a U-shaped connecting frame 602 and two frames 1. The water collection tank 601 is located between the fixed squeezing roller 4 and the transmission rod 508.

[0048] Furthermore, the water collection tank 601 is made of PP material, and the length of the top opening is 10mm longer than the length of the fixed squeezing roller 4 to ensure that the wastewater dripping from the squeezing roller is completely collected; the U-shaped connecting frame 602 is made of stainless steel and is detachably connected to the frame 1 and the water collection tank 601 by bolts, which facilitates the disassembly and cleaning of the water collection tank; the bottom of the water collection tank 601 is equipped with a drain outlet and a ball valve to control the wastewater discharge speed and facilitate connection to external wastewater treatment equipment.

[0049] Please see Figure 4 In this embodiment: a filter screen 603 is slidably installed inside the water collection tank 601, and the filter screen 603 and the water collection tank 601 can be detached and installed via a fixing component 604.

[0050] Furthermore, the filter screen 603 adopts a double-layer structure. The upper layer is an 80-mesh stainless steel filter screen to filter large particles of impurities, and the lower layer is a 200-mesh nylon filter screen to filter fine impurities. The edge of the filter screen 603 is equipped with a silicone sealing strip, which fits tightly against the inner wall of the water collection tank 601 to prevent impurities from leaking into the bottom of the water tank from the gaps.

[0051] Please see Figure 5 In this embodiment: the fixing component 604 includes two U-shaped plates 6041 that are snapped onto the top of the water collection tank 601. The bottom side of the two U-shaped plates 6041 is fixedly installed on the top two sides of the filter screen 603, respectively. Multiple sliding rods 6042 are slidably installed on the other side of the U-shaped plates 6041. One side of the sliding rod 6042 is connected to the pull plate 6043. The pull plate 6043 and the U-shaped plate 6041 are connected by a spring 6044. The other side of the sliding rod 6042 is connected to the insert plate 6045. A storage groove for storing the insert plate 6045 is opened on the inner wall of one side of the U-shaped plate 6041. A slot 6046 for inserting the insert plate 6045 is opened on the side wall of the frame 1.

[0052] Furthermore, the opening width of the U-shaped plate 6041 is 0.5mm larger than the top wall thickness of the water collection tank 601 to ensure a firm connection and easy disassembly. The spring 6044 is a cylindrical helical compression spring, which pushes the insert plate 6045 out of the storage groove and into the slot 6046 in its natural state to ensure reliable fixation.

[0053] The workflow of this embodiment is as follows: The composite current collector is conveyed between the movable squeezing roller 3 and the fixed squeezing roller 4, driving the movable squeezing roller 3 and the fixed squeezing roller 4 to rotate and squeeze water from the composite current collector. The cylinder 204 extends, driving the double-arm lever 202 to rotate, giving the movable squeezing roller 3 a micro-floating capability to adapt to thin film substrates with uneven thickness. Furthermore, both sides of the movable squeezing roller 3 can be adjusted independently. When the surface of the current collector is uneven, there is a problem where liquid on one side of the composite current collector is not removed by the movable squeezing roller 3, while liquid on the other side is removed. In this case, both sides of the movable squeezing roller 3 can be independently controlled according to the actual situation, ensuring that liquid is removed from the entire surface of the current collector while avoiding excessive pressure from the movable squeezing roller 3. The pressure sensor 205 detects the actual pressure value of the double-arm lever 202 in real time, upgrading the adjustment method from blind adjustment based on experience to precise digital display control, ensuring process consistency and traceability. The air pressure regulating valve 206 and the pressure gauge 207 are used to control and display the input air pressure of the cylinder 204. Each limiting roller 506 contacts both sides of the composite current collector, limiting its movement and preventing deviation. The position of the screw seat 503 can be finely adjusted by rotating the screw 502, thereby adjusting the distance between the limiting rollers 506 to accommodate composite current collectors of different widths. The squeezed-out water flows downwards into the water collection tank 601 for collection. Impurities are filtered through the filter screen 603, facilitating subsequent water treatment. When the filter screen 603 needs cleaning, the pull plate 6043 can be pulled, causing the slide rod 6042 to move the insert plate 60... 45. After disengaging from slot 6046, lift the pull plate 6043 upwards to allow the filter screen 603 to leave the water collection tank 601. During installation, similarly, first pull the pull plate 6043, then insert the filter screen 603 into the water collection tank 601. Insert the U-shaped plate 6041 at the edge of the water collection tank 601. Release the pull plate 6043, and through the restoring force of the spring 6044, allow the insert plate 6045 to slide out of the receiving slot and into the insert plate 6045, limiting the water collection tank 601 and the filter screen 603, thus improving the stability of the filter screen 603.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable dewatering roller device for composite current collectors, characterized in that, include: Two racks (1), A movable dewatering roller (3), at least one end of which is movably mounted between the two frames (1) via an adjusting assembly (2); A fixed dewatering roller (4) is provided between the two frames (1) and is located below the movable dewatering roller (3). A water collection mechanism (6) is provided below the fixed squeezing roller (4); The movable dewatering roller (3) and the fixed dewatering roller (4) form a channel for the composite current collector to pass through, and the adjusting component (2) is used to control the end height of at least one end of the movable dewatering roller (3).

2. The adjustable dewatering roller device for a composite current collector according to claim 1, characterized in that, Both sides of the movable squeezing roller (3) and the fixed squeezing roller (4) are provided with limiting components (5) to prevent the composite current collector from shifting position.

3. The adjustable dewatering roller device for a composite current collector according to claim 1, characterized in that, The adjustment assembly (2) includes two T-shaped brackets (201). The two T-shaped brackets (201) are respectively fixedly installed at the middle of the two frames (1) on the side close to each other. The top of the T-shaped bracket (201) is hinged to the middle of the double-arm lever (202). The double-arm lever (202) is equipped with hinge frames (203) on both sides. The top inner wall of the frame (1) is equipped with a cylinder (204). The output ends of the two cylinders (204) are respectively connected to the top of the hinge frames (203) on one side of the two double-arm levers (202). The bearing seats on both sides of the movable squeezing roller (3) are respectively slidably installed on the hinge frames (203) on the other side of the two double-arm levers (202). The bearing seats on both sides of the fixed squeezing roller (4) are respectively fixedly installed on one side of the bottom of the two T-shaped brackets (201).

4. The adjustable dewatering roller device for a composite current collector according to claim 3, characterized in that, The output end of the cylinder (204) is fixedly installed on the top of the pressure sensor (205) and the hinge frame (203); the top of the frame (1) is equipped with a pressure regulating valve (206) and a pressure gauge (207) connected to the air supply pipe of the cylinder (204).

5. The adjustable dewatering roller device for a composite current collector according to claim 2, characterized in that, The limiting component (5) includes two bottom grooves (501), which are respectively opened at the bottom middle of two T-shaped brackets (201). A screw (502) is rotatably installed in the bottom groove (501). A screw seat (503) is provided on the outer side wall of the screw (502) by thread. A frame (505) is installed on both upper ends of the two screw seats (503) on the side closer to each other by connecting rods (504). A limiting roller (506) is rotatably installed between the upper and lower ends of the frame (505).

6. The adjustable dewatering roller device for a composite current collector according to claim 5, characterized in that, The bottom of the T-shaped bracket (201) is provided with a connecting groove (507) on the side away from the fixed squeezing roller (4). A transmission rod (508) is rotatably installed between the two frames (1). The outer side wall of the transmission rod (508) and the outer side wall of the screw (502) passing through the connecting groove (507) are both equipped with synchronous pulleys (509). The two synchronous pulleys (509) are driven by a synchronous belt (5010).

7. The adjustable dewatering roller device for a composite current collector according to claim 5, characterized in that, A limiting rod is installed in the bottom groove (501), and the screw seat (503) and the limiting rod are slidably connected.

8. The adjustable dewatering roller device for a composite current collector according to claim 1, characterized in that, The water collection mechanism (6) includes a water collection tank (601), both sides of which are fixedly installed by a U-shaped connecting frame (602) and two frames (1). The water collection tank (601) is located between the fixed squeezing roller (4) and the transmission rod (508).

9. The adjustable dewatering roller device for a composite current collector according to claim 8, characterized in that, A filter screen (603) is slidably installed inside the water collection tank (601), and the filter screen (603) and the water collection tank (601) are detachably installed via a fixing component (604).

10. The adjustable dewatering roller device for a composite current collector according to claim 9, characterized in that, The fixing assembly (604) includes two U-shaped plates (6041) that are snapped onto the top of the water collection tank (601). The bottom side of the two U-shaped plates (6041) is fixedly installed on the top two sides of the filter screen (603), respectively. Multiple sliding rods (6042) are slidably installed on the other side of the U-shaped plates (6041). One side of the sliding rod (6042) is connected to a pull plate (6043). The pull plate (6043) and the U-shaped plate (6041) are connected by a spring (6044). The other side of the sliding rod (6042) is connected to an insert plate (6045). A storage groove for storing the insert plate (6045) is opened on the inner wall of one side of the U-shaped plate (6041). A slot (6046) for inserting the insert plate (6045) is opened on the side wall of the frame (1).

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