A quick-change snap-fit ​​structure for electrode plates inside an electrophoresis tank

Abstract

This application discloses a quick-change snap-fit ​​structure for electrode plates in an electrophoresis tank, relating to the field of electrophoresis tank technology. It includes an electrophoresis tank, a fixed plate detachably connected within the tank, and electrode plates. An installation mechanism for flexibly installing the fixed plate is provided between the fixed plate and the electrophoresis tank. This application utilizes a clamping mechanism to fix the electrode plates to the fixed plate from all sides. Springs clamp the electrode plates on both sides and top. A second pin penetrates the first pin to further prevent movement of the first pin along its elongated trajectory. The sliding rail of the installation mechanism, the contact rod, and the sliding rod abut against each other, making the clamping of the fixed plate more stable and limiting the vertical movement of the fixed plate. The insertion of a third pin limits the horizontal movement of the fixed plate, making the installation of the fixed plate more stable and preventing the electrode plates from rotating due to the flow and buoyancy of the electrophoresis liquid.

Description

Technical Field

[0001] This application relates to the field of electrophoresis tank technology, and in particular to a quick-change snap-fit ​​structure for electrode plates inside an electrophoresis tank. Background Technology

[0002] Electrophoretic coating is an important coating method. Specifically, the workpiece is immersed in a water-soluble paint, which acts as the anode (anodic electrophoresis). A corresponding cathode is also present. A direct current is passed between the two electrodes. The paint is uniformly applied to the workpiece through the physicochemical action generated by the current. The electrophoresis tank is a large container used to hold the electrophoretic paint solution. The electrode plates are the core components of the electrophoresis tank; their function is to use an electric field to uniformly deposit charged resin particles onto the workpiece surface. Currently, the electrode plates in electrophoresis tanks are typically installed using bolts or welding.

[0003] A search revealed that, for example, Chinese patent literature discloses an electrophoresis tank for electrophoresis of automotive parts (publication number: CN218345567U), but it still has the following shortcomings in practical use:

[0004] The mounting bracket with electrode plates is placed at the edge of the electrophoresis tank in an "n" shaped fit. This detachable connection method is not stable. During the circulation of the electrophoretic liquid, the mounting bracket will shake due to various external forces such as the force of the liquid flow or buoyancy, which will cause the electrode plates to shift. The shift in the position of the electrode plates will disrupt the uniformity of the electric field in the tank, resulting in inconsistent paint film thickness in different areas of the workpiece (such as local excessive thickness or thinness), which will affect the coating quality. Utility Model Content

[0005] To address the issue of electrode plate misalignment caused by detachable electrode plate connections, this application provides a quick-change snap-fit ​​structure for electrode plates within the electrophoresis tank.

[0006] The quick-change snap-fit ​​structure for the electrode plate inside the electrophoresis tank provided in this application adopts the following technical solution:

[0007] The quick-change snap-fit ​​structure for electrode plates in an electrophoresis tank includes an electrophoresis tank, a fixed plate detachably connected to the electrophoresis tank, and electrode plates. An installation mechanism for flexibly installing the fixed plate is provided between the fixed plate and the electrophoresis tank. The electrode plates are mounted on the fixed plate by a number of clamping mechanisms, and the number of clamping mechanisms are used to quickly replace the snap-fit ​​electrode plates on the fixed plate.

[0008] Each of the clamping mechanisms includes a corner plate fixed to a fixed plate and abutting against the bottom of the electrode plate. A connecting block slides on the corner plate, and a first spring is fixed between each connecting block on the same corner plate. A clamping rod is fixed to the top of the connecting block, and a damping shaft, a rotating plate, a first pin, and a second pin are movable between the clamping rods on the same corner plate. A pressure plate, a vertical rod, an I-shaped slider, and a second spring fixed between the vertical rod and the I-shaped slider slide on the rotating plate.

[0009] By adopting the above technical solution, the installation mechanism fixes the fixing plate on the electrophoresis tank, and the clamping mechanism fixes the electrode plate on the fixing plate from all sides. Through the longitudinal and transverse positioning between pin one and pin two, and the clamping of the electrode plate on both sides and top by springs, the electrode plate and the electrophoresis tank are prevented from rotating due to the flow and buoyancy of the electrophoresis liquid. At the same time, the installation method of pins and springs makes the installation and disassembly of the electrode plate more convenient.

[0010] Preferably, the corner plate has a groove for sliding connecting blocks on the side away from the fixed plate, and there are two connecting blocks on the same corner plate. The top of one of the clamping rods is rotatably connected to the rotating plate through a damping shaft, and the top of the rotating plate has an elongated hole. The first pin and the I-shaped slider slide and are locked in the elongated hole. The other clamping rod has through holes for pins to pass through on the movement paths of the first pin and the second pin.

[0011] By adopting the above technical solution, the sliding I-shaped slider allows the pressure plate to always move to the top of electrode plates of different specifications, so that the downward pressure can be located in the middle position of the top of the electrode plate for electrode plates of different specifications, making the downward force more uniform and the downward pressure more stable.

[0012] Preferably, the first pin has a circular hole for the second pin to pass through.

[0013] By adopting the above technical solution, pin one fixes the rotating plate on the clamping rod, and pin two continues to pass through pin one to further prevent pin one from moving in the direction of the long hole trajectory.

[0014] Preferably, there are three sliding I-shaped sliders on the same rotating plate. The vertical rod passes through the I-shaped slider located in the middle position. The pressure plate is fixed to the bottom of the vertical rod and a square plate is fixed to the top of the vertical rod. A strip level is fixed to the top of the square plate. The other two I-shaped sliders are threadedly connected to screw rods, and the two ends of the screw rods are respectively fixed with rings and contact plates that contact the top of the pressure plate.

[0015] By adopting the above technical solution, during the process of the second spring driving the vertical rod to move downward, the pressure plate moves downward with the vertical rod. During this process, the square plate and the pressure plate are parallel to the same horizontal line. The pressure plate presses on the top of the electrode plate so that the two are parallel to the same horizontal line. Therefore, the bar level fixed on the top of the square plate can reflect the horizontal condition of the electrode plate. The turning of the screw can be used to adjust the horizontal condition of the electrode plate, making the horizontal installation of the electrode plate more stable.

[0016] Preferably, an insulating layer is provided between the electrophoresis tank and the fixing plate, which is fixed to the fixing plate.

[0017] By adopting the above technical solution, the insulating layer can isolate the electrochemical coupling between the fixing plate and the electrode plate, thus extending the service life of the equipment.

[0018] Preferably, the installation mechanism includes an insulating mounting plate fixed to the electrophoresis tank. The top of the insulating mounting plate is equipped with a slide rail and a plurality of abutting rods that slide and abut against the slide rail. The fixing plate and the insulating layer are sandwiched between two adjacent abutting rods as a group, and a screw and a locking nut threaded onto the screw are provided between each group of abutting rods.

[0019] By adopting the above technical solution, the number of contact rods can be increased or decreased randomly according to the needs, and the number of electrode plates can be flexibly set according to the specifications of the workpiece, so that the structure can adapt to the electrophoretic processing needs of workpieces of more specifications.

[0020] Preferably, a slide rod that engages with the slide rail is fixed to the bottom of the insulating layer.

[0021] By adopting the above technical solution, the sliding rod makes the installation and fixation of the fixing plate more stable.

[0022] Preferably, the fixing plate and the insulating layer are provided with round holes for inserting the pin three, and the insulating mounting plate and the electrophoresis tank are provided with a plurality of positioning holes evenly distributed along the edge of the electrophoresis tank, and the positioning holes are all the same size as the round holes.

[0023] By adopting the above technical solution, the contact between the slide rail, the abutment rod, and the slide bar makes the clamping of the fixing plate by the abutment rod more stable, restricting the vertical movement of the fixing plate, and the insertion of the third pin restricts the horizontal movement of the fixing plate, making the installation of the fixing plate more stable.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. The electrode plate is fixed to the fixed plate from all sides using a clamping mechanism. Springs clamp the sides and top of the electrode plate. Pin 2 passes through pin 1 to further prevent pin 1 from moving along the long hole trajectory. The sliding rail of the installation mechanism abuts against the contact rod and the sliding rod, making the clamping of the contact rod on the fixed plate more stable and restricting the vertical movement of the fixed plate. Pin 3 passes through to restrict the horizontal movement of the fixed plate, making the installation of the fixed plate more stable and preventing the electrode plate from rotating with the electrophoresis tank due to the flow and buoyancy of the electrophoresis liquid. During operation, simply put in the electrode plate, cover the rotating plate, and insert the pin. The operation is simple and allows for quick assembly and disassembly.

[0026] 2. The number of contact rods can be increased or decreased randomly according to requirements, allowing the number of electrode plates to be flexibly set according to the specifications of the workpiece. The sliding I-beam slider allows the pressure plate to always move to the top of electrode plates of different specifications, ensuring that the downward pressure is located in the middle position of the top of the electrode plate for different specifications, making the downward force more uniform and stable. This structure can adapt to the electrophoretic processing needs of more specifications of workpieces. The electrode plates are installed by fixing the plate, allowing the clamping mechanism to be moved out of the electrophoresis tank as a whole, avoiding excessive accumulation of electrophoretic liquid in corners and making it difficult to flow or drain in order to quickly install the electrode plates.

[0027] 3. As the vertical rod moves downward, the pressure plate moves downward with the vertical rod to clamp the electrode plate from the top. During this process, the square plate and the pressure plate are parallel to the same horizontal line. The pressure plate presses on the top of the electrode plate to make them parallel to the same horizontal line. Therefore, the bar level fixed on the top of the square plate can reflect the horizontal condition of the electrode plate. The turning of the screw can be used to adjust the horizontal condition of the electrode plate, making the horizontal installation of the electrode plate more stable. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of this application;

[0029] Figure 2 This is a partial structural diagram of the clamping mechanism and the installation mechanism of this application;

[0030] Figure 3 This is a schematic diagram of the clamping mechanism of this application mounted on the fixed plate;

[0031] Figure 4 This is a schematic diagram of the structure of the rotating plate with an I-shaped slider that slides on it in this application;

[0032] Figure 5 This is an exploded view of the installation mechanism portion of the present application;

[0033] Figure 6 An exploded view of the structure in which the insulating layer is fixed to the fixed plate.

[0034] Figure label: 1, electrophoresis tank;

[0035] 2. Mounting mechanism; 201. Insulating mounting plate; 202. Slide rail; 203. Abutment rod; 204. Screw one; 205. Locking nut; 206. Slide rod; 207. Pin three; 208. Positioning hole;

[0036] 3. Fixing plate; 4. Electrode plate;

[0037] 5. Clamping mechanism; 501. Angle plate; 502. Clamping rod; 503. First spring; 504. Slide groove; 505. Connecting block; 506. Damping shaft; 507. Rotating plate; 508. Long hole; 509. Pin 1; 510. Pin 2;

[0038] 511. I-beam slider; 512. Vertical rod; 513. Pressure plate; 514. Second spring; 515. Square plate; 516. Bar level; 517. Screw two; 518. Contact plate; 519. Ring;

[0039] 6. Insulation layer. Detailed Implementation

[0040] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0041] This application discloses a quick-change snap-fit ​​structure for electrode plates inside an electrophoresis tank.

[0042] Reference Figure 1 , Figure 6 The electrophoresis tank features a quick-change snap-fit ​​structure for the electrode plates, comprising the electrophoresis tank 1, a detachable fixing plate 3 connected within the electrophoresis tank 1, and electrode plates 4. The electrophoresis tank 1 includes the existing tank body (made of polypropylene pure plastic board), a circulating filtration system primarily consisting of a circulating pump and a filter. The output and input ends of the circulating pump are connected in series with filters and then connected to the inlet and outlet flanges of the tank body. The filters have a structure with a 5μm filter element fixed in the outer shell. The circulating pump is made of Hongchuan GY-403PW material. The electrode plates 3 use a DC power supply, with the voltage range varying depending on the process. Between 50-300V, the electrode plate 4 is connected to the power output terminal through external wires, busbars, etc., and the circuit is equipped with components such as resistors and capacitors to stabilize the current and voltage. The electrode plate 4 is made of acid-resistant stainless steel plate. An insulating layer 6 is provided between the electrophoresis tank 1 and the fixing plate 3 and is fixed to the fixing plate 3. The insulating layer 6 is made of fluororubber. The electrophoresis tank 1 is equipped with an installation mechanism 2 for flexibly installing the fixing plate 3. Each fixing plate 3 and each electrode plate 4 is equipped with a clamping mechanism 5. Several clamping mechanisms 5 are used for quick replacement of the clamping electrode plate 4.

[0043] Reference Figures 2-4Each of the clamping mechanisms 5 includes a corner plate 501 fixed to the fixed plate 3 and abutting against the bottom of the electrode plate 4. A groove 504 is formed on the side of the corner plate 501 away from the fixed plate 3. Two connecting blocks 505 slide within each groove 504. A first spring 503 is fixed between the two connecting blocks 505. A clamping rod 502 is integrally formed on the top of each connecting block 505 near the fixed plate 3. A damping shaft 506 is fixed to the top of one of the clamping rods 502. A rotating plate 507 is rotatably connected to the damping shaft 506. The damping shaft 506 is a friction damping shaft, which provides controllable resistance through a structure of friction plates and spring pre-tightening. An elongated hole 508 is formed on the top of the rotating plate 507. A pin 509 slides within the elongated hole 508 at the end away from the damping shaft 506. The pin 509 consists of a transverse square rod and a sliding... The clamping mechanism 5 is composed of several parts, including a slider that abuts against a long hole 508, a square rod pin that passes through another clamping rod 502, and round holes at the top of both the square rod pin and the clamping rod 502. A second pin 510 is inserted into a first pin 509 through the long hole 508 and the clamping rod 502. Three I-shaped sliders 511 slide between the first pin 509 and the damping shaft 506 in the long hole 508. The top of the middle I-shaped slider 511 has a through hole, and a vertical rod 512 slides in the through hole. A square plate 515 is fixed to the top of the vertical rod 512, and a pressure plate 513 is fixed to the bottom of the vertical rod 512. The side cross-section of the pressure plate 513 is right-angled. A second spring 514 is fixed between the pressure plate 513 and the I-shaped slider 511, and the vertical rod 512 is located in the second spring 514. All structural parts of the clamping mechanism 5 are made of 316L stainless steel.

[0044] Reference Figure 3 A strip level 516 is fixed to the top of the square plate 515. The tops of the other two I-shaped sliders 511 are threaded holes, and screw rods 517 are threaded into the threaded holes. A contact plate 518 is fixed to the bottom of screw rod 517. The bottom of the contact plate 518 can contact the two sides of the top of the pressure plate 513. A ring 519 is fixed to the top of screw rod 517.

[0045] It should be noted that the contact surfaces between the electrode plate 4 and the fixed plate 3 on the electrode plate 4 and the parts in the mounting mechanism 2 are all fixed with an insulating layer, and the insulating layer is made of fluororubber.

[0046] When installing electrode plate 4, it is pressed tightly against fixing plate 3 between two clamping rods 502. Connecting block 505 moves with clamping rod 502 in sliding groove 504 of corner plate 501. First spring 503 extends as the distance between connecting blocks 505 increases until the bottom of electrode plate 4 contacts corner plate 501. At this time, the restoring force of first spring 503 drives connecting block 505 and clamping rod 502 to tightly clamp the left and right sides of electrode plate 4. Rotating plate 507 through damping shaft 506, sliding pin 509 in elongated hole 508 on rotating plate 507, so that pin 509 is inserted into the side of clamping rod 502. Inside the square hole at the top of the square, the second pin 510 is held and passes from top to bottom through the elongated hole 508, the round hole at the top of the clamping rod 502, and into the round hole at the top of the first pin 509. The sliding block 511 is slid, and the vertical rod 512 and the pressure plate 513 move with the sliding block 511 until the pressure plate 513 moves to the middle position at the top of the electrode plate 4. The restoring force of the second spring 514 increases the distance between the pressure plate 513 and the sliding block 511. The sliding block 511 abuts against the elongated hole 508 and cannot move up or down. Therefore, the pressure plate 513 moves downward with the restoring force of the second spring 514.

[0047] The vertical rod 512 slides downwards with the pressure plate 513 within the through hole at the top of the I-beam slider 511. The right-angled side profile of the angle plate 501 and the pressure plate 513 clamps the front end of the electrode plate 4, achieving clamping of the electrode plate 4 on all six sides (up, down, front, back, left, and right). After clamping by the pressure plate 513, the square plate 515 reflects the levelness of the pressure plate 513. The strip level 516 fixed to the top of the square plate 515 indirectly displays the levelness of the electrode plate 4. If the electrode plate 4 is not installed horizontally, the I-beam slider 511, which is slidably fitted with the screw 517, will... 11. Rotate the corresponding screw 517 according to the level display. Through the threaded transmission between the screw 517 and the threaded hole at the top of the I-shaped slider 511, the contact plate 518 moves linearly up and down in a rotating manner. The contact plate 518 presses down on one side of the top of the pressure plate 513 until the bar level 516 displays the level state, thus realizing the horizontal installation of the electrode plate 4. When the electrophoretic liquid is immersed in the electrode plate 4, the bar level 516 is still at the top of the electrode plate 4 and can display the level of the electrode plate 4 in real time.

[0048] Reference Figure 5The installation mechanism 2 includes an insulating mounting plate 201 attached to the electrophoresis tank 1. A slide rail 202 is welded to the top of the insulating mounting plate 201. A contact rod 203 slides and abuts within the slide rail 202. The contact rod 203 consists of a protrusion that fits into the slide rail 202, a square block integrally formed on the top of the protrusion, and a long rod on the bottom of the square block away from the protrusion. The protrusion is used to slide within the slide rail 202, the square block is used to pass through a screw 204, and the long rod is used to clamp the two sides of the fixing plate 3. A fixing plate 3 is clamped between the two contact rods 203. The fixed plate 3 is fitted with a screw rod 204, and a locking nut 205 is threaded onto the screw rod 204. A sliding rod 206 is attached to the bottom of the insulating layer 6. The sliding rod 206 can slide in the slide rail 202. The fixed plate 3 and the insulating layer 6 have round holes, and a pin 207 passes through the round holes. The insulating mounting plate 201 and the top of the electrophoresis tank 1 have positioning holes 208 evenly distributed along the edge of the electrophoresis tank 1. The pin 207 can pass through both the round holes and the positioning holes 208 at the same time. The positioning holes 208 are all the same size as the round holes.

[0049] The number of electrode plates 4 is determined according to the workpiece specifications, and the corresponding number of abutment rods 203 are slid into one side of the slide rail 202. Two abutment rods 203 form a group. The fixing plate 3 is aligned with the slide rail 202 through the slide rod 206 and slid into the group of abutment rods 203. The screw 204 is passed through the abutment rod 203 and the locking nut 205 is tightened so that the abutment rods 203 clamp the fixing plate 3 from both sides. The limit between the slide rod 206 and the slide rail 202 restricts the vertical movement of the fixing plate 3. The pin 207 is inserted through the round hole on the fixing plate 3 until it passes through the positioning hole 208, further restricting the left and right sides of the fixing plate 3, thereby fixing the fixing plate 3 and realizing the overall detachability of the clamping mechanism 5.

[0050] The implementation principle of the quick-change snap-fit ​​structure for electrode plates in the electrophoresis tank in this embodiment is as follows: During installation, the contact rod 203 is first inserted into the slide rail 202. Between the two contact rods 203, the slide rod 206 is inserted into the slide rail 202 to install the fixing plate 3 inside the electrophoresis tank 1. A screw 204 is then inserted between the contact rods 203, and the locking nut 205 is tightened. The pin 207 is then inserted into the round hole above the fixing plate 3 until it penetrates the positioning hole 208, thus installing the fixing plate 3. Subsequently, the electrode plate 4 is inserted into the clamping rod 5. Between 02 and 02, until the bottom of the electrode plate 4 contacts the corner plate 501, the restoring force of the first spring 503 causes the clamping rod 502 to clamp both sides of the electrode plate 4. Rotating the rotating plate 507 causes the pressure plate 513 to tightly abut against the electrode plate 4. The pressure plate 513, the corner plate 501 and the fixing plate 3 clamp the electrode plate 4 in front and behind and up and down, so as to fix the electrode plate 4. This makes the electrode plate 4 easy to install and remove, and the clamping mechanism 5 and the installation mechanism 2 can be moved out of the electrophoresis tank 1 to avoid too much electrophoresis liquid deposition in the corners of the tank.

[0051] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A quick-change snap-fit ​​structure for electrode plates inside an electrophoresis tank, comprising an electrophoresis tank (1), a fixing plate (3) detachably connected inside the electrophoresis tank (1), and electrode plates (4), characterized in that: An installation mechanism (2) for flexibly installing the fixed plate (3) is provided between the fixed plate (3) and the electrophoresis tank (1). The electrode plate (4) is installed on the fixed plate (3) by a number of clamping mechanisms (5), and the number of clamping mechanisms (5) are used to quickly replace the snap-fit ​​electrode plate (4) on the fixed plate (3). Each of the clamping mechanisms (5) includes a corner plate (501) fixed to the fixed plate (3) and abutting against the bottom of the electrode plate (4). A connecting block (505) slides on the corner plate (501), and a first spring (503) is fixed between each connecting block (505) located on the same corner plate (501). A clamping rod (502) is fixed to the top of the connecting block (505), and a damping shaft (506), a rotating plate (507), a first pin (509), and a second pin (510) move between the clamping rods (502) located on the same corner plate (501). A pressure plate (513), a vertical rod (512), an I-shaped slider (511), and a second spring (514) fixed between the vertical rod (512) and the I-shaped slider (511) slide on the rotating plate (507).

2. The quick change clamp structure for electrophoresis tank electrode plate according to claim 1, characterized in that: The corner plate (501) has a groove (504) for sliding connecting blocks (505) on the side away from the fixed plate (3), and there are two connecting blocks (505) on the same corner plate (501). The top of one of the clamping rods (502) is rotatably connected to the rotating plate (507) through the damping shaft (506), and the top of the rotating plate (507) has an elongated hole (508). The first pin (509) and the I-shaped slider (511) slide and are locked in the elongated hole (508). The other clamping rod (502) has through holes for pins to pass through on the movement trajectory of the first pin (509) and the second pin (510).

3. The quick change clamp structure for electrophoresis tank electrode plate according to claim 2, characterized in that: The first pin (509) has a round hole for the second pin (510) to pass through.

4. The quick-change snap-fit ​​structure for electrode plates inside the electrophoresis tank according to claim 1, characterized in that: There are three sliding I-shaped sliders (511) on the same rotating plate (507). The vertical rod (512) passes through the I-shaped slider (511) located in the middle position. The pressure plate (513) is fixed to the bottom of the vertical rod (512) and a square plate (515) is fixed to the top of the vertical rod (512). A bar level (516) is fixed to the top of the square plate (515). The other two I-shaped sliders (511) are threadedly connected to a screw rod (517) and both ends of the screw rod (517) are respectively fixed with a ring (519) and an abutment plate (518) that contacts the top of the pressure plate (513).

5. The quick-change snap-fit ​​structure for electrode plates inside the electrophoresis tank according to claim 1, characterized in that: An insulating layer (6) is provided between the electrophoresis tank (1) and the fixing plate (3) and is fixedly connected to the fixing plate (3).

6. The quick-change snap-fit ​​structure for electrode plates inside the electrophoresis tank according to claim 5, characterized in that: The installation mechanism (2) includes an insulating mounting plate (201) fixed to the electrophoresis tank (1). The top of the insulating mounting plate (201) is equipped with a slide rail (202) and a plurality of abutting rods (203) that slide and abut against the slide rail (202). The fixing plate (3) and the insulating layer (6) are sandwiched between two adjacent abutting rods (203) as a group. A screw rod (204) and a locking nut (205) threaded onto the screw rod (204) are provided between each group of abutting rods (203).

7. The quick-change snap-fit ​​structure for electrode plates inside the electrophoresis tank according to claim 6, characterized in that: The bottom of the insulating layer (6) is fixed with a slide rod (206) that fits into the slide rail (202).

8. The quick-change snap-fit ​​structure for electrode plates inside the electrophoresis tank according to claim 1, characterized in that: The fixing plate (3) and the insulating layer (6) are provided with round holes for inserting the pin three (207), and the insulating mounting plate (201) and the electrophoresis tank (1) are provided with a number of positioning holes (208) evenly along the edge of the electrophoresis tank (1), and the positioning holes (208) are all the same size as the round holes.

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