A sash fan section spraying process

Abstract

The application discloses a flat-opening window screen fan section bar spraying process, and belongs to the technical field of flat-opening window screen fan section bar spraying technology. The process comprises a hanging frame, a plurality of lifting frames which are arranged in a linear array and vertically slide with the hanging frame, a plurality of sliding seats which are arranged in a linear array and horizontally slide with the lifting frames, a plurality of clamps which are arranged in a linear array and are installed at the bottom of the sliding seats through limiting structures, a vertical adjusting assembly which is used for adjusting the height of the lifting frames and can incrementally adjust adjacent lifting frames, and a horizontal adjusting assembly which is used for adjusting the horizontal position of the sliding seats and can incrementally adjust adjacent sliding seats. The bottom of a screen fan frame is offset from one side, and the screen fan frame is sprayed. After spraying is completed, the screen fan frame is rotated, and the other half of the frame is sprayed. The process can avoid air spraying and waste of pigments or powders.

Description

A spray coating process for casement window screen profiles Technical Field

[0001] This invention relates to the field of spray coating technology for casement window screen sash profiles, specifically a spray coating process for casement window screen sash profiles. Background Technology

[0002] Nowadays, color coordination is not only important for clothing and food, but also for food's appealing color, aroma, and taste. Home decoration also places great emphasis on color matching. To achieve a sophisticated look in home design, color coordination is extremely crucial. The color scheme of doors, windows, and screens plays a pivotal role in the decoration process. It needs to coordinate not only with the walls and floors but also with the furniture and soft furnishings to avoid looking jarring.

[0003] The painting process for door and window screen frames is divided into pre-forming painting and post-forming painting. Post-forming painting involves suspending the formed screen frame on a conveyor belt for intermittent or continuous transport, during which a painting mechanism sprays it. The painting mechanism continuously reciprocates vertically, applying paint or powder to the screen frame. Because door and window screens consist of a frame and a mesh screen, when the painting mechanism passes outside the frame (where the mesh is installed), the sprayed paint or powder cannot land on the frame. This not only wastes a large amount of paint or powder but also wastes a significant amount of time, increasing both the painting time and the cost of the screen frame. Summary of the Invention

[0004] The technical problem of this invention is to provide a spraying process for a casement window screen sash profile, in which the bottom of the screen sash frame is offset from one side and sprayed. After spraying, the screen sash frame is rotated and the other half of the frame is sprayed. This can avoid dry spraying and also avoid waste of pigment or powder.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a spraying process for casement window screen sash profiles, including a hanging bracket.

[0006] Several lifting frames are arranged in a linear array, and each is vertically slidable relative to the hanging frame;

[0007] Several sliding blocks are arranged in a linear array and are laterally slidably connected to the lifting frame;

[0008] Several clamps are arranged in a linear array and are mounted on the bottom of the slide by a limiting structure;

[0009] The vertical adjustment component is used to adjust the height of the lifting frame and can incrementally adjust adjacent lifting frames.

[0010] The lateral adjustment component is used to adjust the lateral position of the slide and can incrementally adjust adjacent slides.

[0011] As a further aspect of the present invention, the vertical adjustment component includes

[0012] The drive motor is mounted on the side wall of the bracket, and the output shaft is equipped with a winding spool;

[0013] Guide wheels are rotatably mounted on the top of both sides of the lifting frame;

[0014] Fixed piles are fixedly installed at the bottom of both sides of the lifting frame;

[0015] The driven traction rope is wound around the guide wheel in the middle and fixed at both ends to the fixed piles on the lifting frame adjacent to the guide wheel. The end of the driven traction rope in the first row is fixed to the hanging frame.

[0016] The transmission traction rope has one end wound around the winding reel and the other end fixed to a fixed pile on the adjacent lifting frame.

[0017] As a further aspect of the present invention, the lateral adjustment component includes

[0018] The threaded rod is threadedly connected to the slide block;

[0019] The drive gears are located on both sides of the lifting frame and are fixed to the threaded rods;

[0020] The drive rack is fixed to the bracket and meshes with the drive gear.

[0021] As a further aspect of the present invention, the clamp includes

[0022] The bracket, inserted into the bottom of the slide, is used to hang the gauze fan;

[0023] A rotary motor, fixed to the bottom of the bracket, is used to rotate the screen.

[0024] A lateral telescopic component and a longitudinal telescopic component, wherein the lateral telescopic component is fixed at the end of the movable end of the longitudinal telescopic component, and the longitudinal telescopic component is installed at the end of the output shaft of the rotary motor.

[0025] As a further aspect of the present invention, the limiting structure includes

[0026] The wedge-shaped block is slidably mounted on the top of the bracket and has an upper chamfer at its end;

[0027] The relief spring is fixed between the bracket and the relief wedge block;

[0028] The limiting block is fixed to the inner wall of the slide block, and its end is provided with a lower chamfer that matches the upper chamfer.

[0029] The movable wedge block is slidably set with the slide block, and both ends are provided with clearance chamfers.

[0030] As a further embodiment of the present invention, the slide block has a slot that matches the movable wedge block, the slide block is slidably provided with a limiting member, a limiting spring is fixed between the limiting member and the slide block, and the slide block is slidably provided with a slide rod fixed to the limiting member, the end of the slide rod penetrating the side wall of the slide block.

[0031] As a further embodiment of the present invention, a swing arm is rotatably arranged inside the bracket via a torsion spring. The top of the swing arm abuts against a clearance wedge block, and a ring ruler is fixedly provided at the bottom of the swing arm. The ring ruler meshes with an indicator gear that is rotatably arranged with the bracket. A pointer is fixedly provided coaxially with the indicator gear and the pointer is located on the outside of the bracket.

[0032] As a further embodiment of the present invention, side plates are installed on both sides of the longitudinal telescopic member, the side plates are slidably connected to limit rods, a return spring is fixed between the limit rods and the side plates, and a ring plate is fixed at the bottom of the bracket, the ring plate having a groove.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] In this invention, the vertical adjustment component drives the lifting frame to descend incrementally, while the horizontal adjustment component drives the slide block to move horizontally incrementally. After the side wall and bottom of the gauze fan frame on the side of the slide block's movement direction are completely offset, the exposed part of the rear gauze fan frame is L-shaped. The spray gun sprays the gauze fan frame along the exposed part of the rear gauze fan frame as the movement trajectory, thus completing the spraying work of half of the gauze fan. To spray the other half of the gauze fan, the gauze fan frame can be removed and rotated 180°, and the other part of the gauze fan can be sprayed in the same way. In this process, multiple gauze fan frames can be sprayed, which can reduce the spraying time. In addition, there are no empty spraying parts in the sprayed area during this spraying process, which can reduce the pigment or powder consumed by the spraying, thereby reducing the spraying time and the cost of spraying the gauze fan frame. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 is a schematic diagram of the internal structure of the bracket and its connection relationship of the present invention;

[0038] Figure 3 is a schematic diagram of the lifting frame and its connection structure of the present invention;

[0039] Figure 4 is a schematic diagram of the misaligned state structure of the lifting frame of the present invention;

[0040] Figure 5 is a schematic diagram of the cross-sectional structure of a single slide block and its connection relationship according to the present invention;

[0041] Figure 6 is an enlarged structural schematic diagram of point A in Figure 5 of the present invention;

[0042] Figure 7 is an enlarged structural diagram of point B in Figure 5 of the present invention;

[0043] Figure 8 is an enlarged structural schematic diagram of point C in Figure 5 of the present invention;

[0044] Figure 9 is a schematic diagram of the fixture and its connection structure according to the present invention;

[0045] Figure 10 is an enlarged structural schematic diagram of point D in Figure 9 of the present invention;

[0046] The attached diagram lists the components represented by each number as follows:

[0047] 1. Hanger; 11. Lifting frame; 12. Slide seat; 13. Clamp; 14. Bracket; 15. Rotary motor; 16. Lateral telescopic component; 17. Longitudinal telescopic component; 21. Drive motor; 22. Winding reel; 23. Guide wheel; 24. Fixed stake; 25. Driven traction rope; 26. Transmission traction rope; 31. Threaded rod; 32. Drive rack; 33. Drive gear; 41. Yield wedge block; 42. Upper chamfer; 43. Yield spring; 44. Limit block; 45. Lower chamfer; 46. Movable wedge block; 47. Yield chamfer; 51. Groove; 52. Limit component; 53. Limit spring; 54. Slide rod; 61. Swing rod; 62. Ring scale bar; 63. Indicating gear; 64. Pointer; 71. Side plate; 72. Limit rod; 73. Return spring; 74. Ring plate; 75. Groove. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Please refer to Figures 1-10. This invention provides a technical solution: a spraying process for casement window screen profiles, including a hanger 1.

[0050] Several lifting frames 11 are arranged in a linear array and are all vertically slidable with the hanging frame 1;

[0051] Several sliding blocks 12 are arranged in a linear array and are laterally slidably connected to the lifting frame 11;

[0052] Several clamps 13 are arranged in a linear array and are installed at the bottom of the slide block 12 by a limiting structure;

[0053] A vertical adjustment component is used to adjust the height of the lifting frame 11, and can incrementally adjust adjacent lifting frames 11.

[0054] A lateral adjustment component is used to adjust the lateral position of the slide 12, and can incrementally adjust adjacent slides 12.

[0055] Specifically, the frame of the screen to be sprayed is held by the clamp 13, and the clamp 13 is installed at the bottom of the slide block 12 by the limiting structure;

[0056] Referring to Figures 3 and 4, the vertical adjustment component drives the lifting frame 11 to descend in height, and the lifting frame 11 descends in an incremental manner. The slide block 12 slidably mounted on the lifting frame 11 descends accordingly, and the gauze fan frame held by the clamp at the bottom of the slide block 12 also descends. When the bottom of the gauze fan frame is misaligned, the vertical adjustment component stops descending, so that the bottoms of adjacent gauze fan frames are misaligned. At the same time, the horizontal adjustment component drives the slide block 12 to slide along the lifting frame 11, and the gauze fan frame held at the bottom of the slide block 12 moves horizontally accordingly. When the sides of adjacent gauze fan frames are misaligned, the horizontal adjustment component stops moving, so that the side walls of adjacent gauze fan frames are misaligned.

[0057] In summary, the vertical adjustment component drives the lifting frame 11 to descend incrementally, while the horizontal adjustment component drives the slide 12 to move horizontally incrementally. After the side wall and bottom of the gauze fan frame on the side of the slide 12's movement direction are completely offset, the exposed part of the rear gauze fan frame is L-shaped. The spray gun sprays the gauze fan frame along the exposed part of the rear gauze fan frame as the movement trajectory, thus completing the spraying work of half of the gauze fan. To spray the other half of the gauze fan, the gauze fan frame can be removed and rotated 180°, and the other part of the gauze fan can be sprayed in the same way. In this process, multiple gauze fan frames can be sprayed, which can reduce the spraying time. In addition, there are no empty spraying parts in the sprayed area during this spraying process, which can reduce the pigment or powder consumed by the spraying, thereby reducing the spraying time and the cost of gauze fan frame spraying.

[0058] It should be noted that when the spraying requirements are high, the first row of screen fans can be replaced with a flat plate of the same size. This flat plate has a part on the back that can be clamped by a fixture. By using the panel, the second row (i.e., the frame of the screen fan closest to the flat plate) can be masked, reducing the area of ​​repeated spraying and improving the quality of spraying.

[0059] As a further aspect of the present invention, the vertical adjustment component includes...

[0060] The drive motor 21 is mounted on the side wall of the bracket 1, and the output shaft is equipped with a winding spool 22;

[0061] Guide wheels 23 are rotatably mounted on the top of both sides of the lifting frame 11;

[0062] Fixed piles 24 are fixedly installed at the bottom of both sides of the lifting frame 11;

[0063] The driven traction rope 25 is wound around the guide wheel 23 in the middle and fixed at both ends to the fixed piles 24 on the lifting frame 11 adjacent to the guide wheel 23. The end of the first row of driven traction ropes 25 is fixed to the hanging frame 1.

[0064] The transmission traction rope 26 has one end wound around the winding reel 22 and the other end fixed to the fixed pile 24 on the adjacent lifting frame 11.

[0065] Specifically, referring to Figures 2, 3, 4, and 5, the drive motor 21 releases the transmission traction rope 26 through the winding reel 22. The upward pull of the end of the transmission traction rope 26 and its fixed post 24 causes the lifting frame 11 fixed to the fixed post 24 to descend under the action of gravity, realizing the descent of the first row of lifting frames 11. When the first row of lifting frames 11 descends, the guide wheel 23, which is rotatably mounted on the first row of lifting frames 11, also descends. Since one end of the driven traction rope 25 wound around the guide wheel 23 is fixed to the hanging frame 1, the other end of the driven traction rope 25 can descend, thereby causing the second row of lifting frames 11 to fall under the action of gravity. And so on, the third and fourth rows of lifting frames 11 descend synchronously, thereby staggering the bottom of the adjacent screen frame, avoiding obstruction during the spraying process, which would result in the bottom of the screen frame not being able to be sprayed, thus affecting the spraying effect.

[0066] It should be noted that the adjacent guide wheels 23 are staggered, that is, the distance from the lifting frame 11 is different, and the distance from the spaced guide wheels 23 to the lifting frame 11 is the same, so as to avoid mutual friction and interference of the driven traction ropes 25.

[0067] As a further aspect of the present invention, the lateral adjustment component includes...

[0068] The threaded rod 31 is threadedly connected to the slide block 12;

[0069] The drive gear 33 is located on both sides of the lifting frame 11 and is fixed to the threaded rod 31;

[0070] The drive rack 32 is fixed to the bracket 1 and meshes with the drive gear 33;

[0071] Specifically, as shown in Figures 2-5, when the lifting frame 11 descends, the drive gear 33 descends and rotates under the action of the drive rack 32. The drive gear 33 simultaneously drives the threaded rod 31 to rotate, and the threaded rod 31 drives the slide 12 connected to it to move. Since the descent distance of the lifting frame 11 is increasing, the descent distance of each drive gear 33 is also increasing, which in turn causes the movement distance of each slide 12 to be increasing. This synchronously offsets the sides of adjacent screen frames, avoiding obstruction during the spraying process, which would prevent the sides of the screen frames from being sprayed and thus affect the spraying effect.

[0072] As a further aspect of the present invention, the clamp 13 includes

[0073] The bracket 14 is inserted into the bottom of the slide 12 and is used to hang the gauze fan;

[0074] A rotary motor 15 is fixed to the bottom of the bracket 14 and is used to rotate the screen.

[0075] The transverse telescopic member 16 and the longitudinal telescopic member 17 are provided. The transverse telescopic member 16 is fixed to the end of the movable end of the longitudinal telescopic member 17, and the longitudinal telescopic member 17 is installed at the end of the output shaft of the rotary motor 15.

[0076] Specifically, as shown in Figure 9, the horizontal telescopic component 16 and the vertical telescopic component 17 clamp the window screen sash. After the edge of the exposed part of the window screen sash is painted, the rotary motor 15 drives the vertical telescopic component 17 to rotate, thereby rotating the edge of the exposed part of the window screen sash to the other side, thus exposing the unpainted part of the edge of the window screen sash. There is no need to remove the screen sash for replacement, further reducing the painting time and painting cost.

[0077] As a further aspect of the present invention, the limiting structure includes...

[0078] The wedge block 41 is slidably mounted on the top of the bracket 14 and has an upper chamfer 42 at its end;

[0079] The relief spring 43 is fixed between the bracket 14 and the relief wedge block 41;

[0080] The limiting block 44 is fixed to the inner side wall of the slide block 12, and its end is provided with a lower chamfer 45 that cooperates with the upper chamfer 42;

[0081] The movable wedge block 46 is slidably set with the slide block 12, and both ends are provided with clearance chamfers 47;

[0082] Specifically, referring to Figures 5, 6, and 7, when the bracket 14 is inserted into the bottom of the slide block 12, the lower chamfer 45 can guide the top of the bracket 14, reducing the assembly difficulty; when the upper chamfer 42 at the end of the relief wedge block 41 contacts the slide block 12, the relief wedge block 41 retracts into the bracket 14 and compresses the relief spring 43 until the relief wedge block 41 passes the limit block 44. At this time, the relief spring 43 will pop the relief wedge block 41 out of the bracket 14. The relief wedge block 41 is blocked by the limit block 44 and cannot descend, thereby limiting the descent of the bracket 14, completing the installation of the bracket 14 at the bottom of the slide block 12, realizing quick installation;

[0083] When bracket 13 needs to be removed, push bracket 14 upwards, and the clearance wedge 41 passes over the movable wedge 46 through the clearance chamfer 47. Then pull bracket downwards, and the movable wedge 46 descends until it contacts the limiting block 44. The clearance chamfer 47 presses the clearance wedge 41 into bracket 14, so that the clearance wedge 41 passes over the movable wedge 46 and the limiting block 44, thereby removing bracket 14 from the bottom of the slide. This achieves quick disassembly, thereby reducing the difficulty and time of operation, and reducing the preparation time for spraying.

[0084] As a further embodiment of the present invention, the slide block 12 is provided with a slot 51 that matches the movable wedge block 46, the slide block 12 is slidably provided with a limiting member 52, a limiting spring 53 is fixed between the limiting member 52 and the slide block 12, and the slide block 12 is slidably provided with a slide rod 54 fixed to the limiting member 52, the end of the slide rod 54 penetrating through the side wall of the slide block 12.

[0085] Specifically, referring to Figures 5 and 7, when the slide block 12 moves, the limiting spring 53 ejects the end of the slide rod 54 from the slide block 12, and the limiting member 52 fixed to the slide rod 54 moves accordingly. The limiting member 52 moves out of the slot 51, so that when the movable wedge block 46 rises, it can enter the slot 51, thereby preventing the displacement wedge block 41 from being unable to pass the movable wedge block 46 and thus preventing the bracket 14 from being removed from the bottom of the slide block 12. This ensures that the bracket 12 cannot be removed after the slide block 12 moves, and prevents the bracket 12 from falling off during the spraying process, which would cause the screen frame to break.

[0086] As a further embodiment of the present invention, a swing rod 61 is rotatably provided inside the bracket 14 via a torsion spring. The top of the swing rod 61 abuts against the relief wedge block 41. A ring ruler strip 62 is fixedly provided at the bottom of the swing rod 61. The ring ruler strip 62 meshes with an indicator gear 63 that is rotatably provided with the bracket 14. A pointer 64 is fixedly provided coaxially with the indicator gear 63. The pointer 64 is located outside the bracket 14.

[0087] Specifically, as shown in Figures 5, 6, and 8, when the yielding wedge block 41 retracts into the bracket 14, the top of the swing rod 61 rotates under force, and the ring scale 62 at the bottom of the swing rod 61 rotates around the connection point between the swing rod 61 and the bracket 14. The ring scale 62 drives the pointer 64 to rotate through the indicator gear 63. By observing the rotation state of the pointer 64, the retraction state of the yielding wedge block 41 can be observed, making it easier to understand the position of the yielding wedge block 41, and thus understand the contact state between the yielding wedge block 41 and the limiting block 44 and the movable wedge block 46, reducing the difficulty of loading and unloading the bracket 14.

[0088] As a further embodiment of the present invention, side plates 71 are installed on both sides of the longitudinal telescopic member 17, and the side plates 71 are slidably connected to the limit rods 72. A return spring 73 is fixed between the limit rods 72 and the side plates 71. A ring plate 74 is fixed at the bottom of the bracket 14, and a groove 75 is provided in the ring plate 74.

[0089] Specifically, referring to Figures 9 and 10, the return spring 73 presses the end of the limiting rod 72 into the groove 75, making the ring plate 74 and the side plate 71 relatively stationary. This can prevent the longitudinal telescopic member 17 from rotating during the spraying process, which would cause the gauze fan frame to swing and thus affect the spraying of the gauze fan frame. When the longitudinal telescopic member 17 rotates, the limiting rod 72 can move out of the groove 75, and the ring plate 74 can keep the return spring 73 in a compressed state through the limiting rod 72 until the limiting rod 72 coincides with the groove 75 on the other side. The return spring 73 then inserts the limiting rod 72 into the groove 75, keeping the gauze fan frame stationary again.

Claims

1. A spraying process for casement window screen profiles, comprising a hanging bracket (1), characterized in that: A number of lifting frames (11) are arranged in a linear array and are all vertically slidably mounted on the hanging frame (1); a number of sliding blocks (12) are arranged in a linear array and are laterally slidably connected to the lifting frames (11); a number of clamps (13) are arranged in a linear array and are installed on the bottom of the sliding blocks (12) through a limiting structure; a vertical adjustment component is used to adjust the height of the lifting frames (11) and can incrementally adjust adjacent lifting frames (11); a horizontal adjustment component is used to adjust the horizontal position of the sliding blocks (12) and can incrementally adjust adjacent sliding blocks (12); the vertical adjustment component includes a drive motor (21) installed on the side wall of the hanging frame (1) and a winding disc (22) installed on the output shaft; guide wheels (23) are rotatably mounted on the top of both sides of the lifting frames (11). ; Fixed piles (24) are fixedly installed at the bottom of both sides of the lifting frame (11); Driven traction rope (25) is wound around the guide wheel (23) in the middle and fixed at both ends to the fixed piles (24) on the adjacent lifting frame (11) of the guide wheel (23), wherein the end of the first row of driven traction ropes (25) is fixed to the hanging frame (1); Transmission traction rope (26) is wound around the winding disc (22) at one end and fixed to the fixed piles (24) on the adjacent lifting frame (11) at the other end; The lateral adjustment assembly includes a threaded rod (31) which is threadedly connected to the slide (12); Drive gear (33) is located on both sides of the lifting frame (11) and fixed to the threaded rod (31); Drive rack (32) is fixed to the hanging frame (1) and meshes with the drive gear (33).

2. The spraying process for casement window screen profiles according to claim 1, characterized in that: The clamp (13) includes a bracket (14) inserted into the bottom of the slide (12) for suspending the gauze fan; a rotary motor (15) fixed to the bottom of the bracket (14) for rotating the gauze fan; a transverse telescopic member (16) and a longitudinal telescopic member (17), wherein the transverse telescopic member (16) is fixed to the end of the movable end of the longitudinal telescopic member (17), and the longitudinal telescopic member (17) is installed at the end of the output shaft of the rotary motor (15).

3. The spraying process for a casement window screen profile according to claim 2, characterized in that: The limiting structure includes a relief wedge block (41), which is slidably disposed on the top of the bracket (14) and has an upper chamfer (42) at its end; a relief spring (43), which is fixed between the bracket (14) and the relief wedge block (41); a limiting block (44), which is fixed on the inner side wall of the slide (12) and has a lower chamfer (45) at its end that cooperates with the upper chamfer (42); and a movable wedge block (46), which is slidably disposed with the slide (12) and has relief chamfers (47) at both ends.

4. The spraying process for casement window screen profiles according to claim 3, characterized in that: The slide block (12) has a slot (51) that matches the movable wedge block (46). The slide block (12) is slidably provided with a limiting member (52). A limiting spring (53) is fixed between the limiting member (52) and the slide block (12). The slide block (12) is slidably provided with a slide rod (54) fixed to the limiting member (52). The end of the slide rod (54) penetrates the side wall of the slide block (12).

5. The spraying process for a casement window screen profile according to claim 4, characterized in that: Inside the bracket (14), a swing arm (61) is rotatably mounted via a torsion spring. The top of the swing arm (61) abuts against a relief wedge block (41). A ring ruler strip (62) is fixedly mounted at the bottom of the swing arm (61). The ring ruler strip (62) meshes with an indicator gear (63) that is rotatably mounted with the bracket (14). A pointer (64) is fixedly mounted coaxially with the indicator gear (63). The pointer (64) is located outside the bracket (14).

6. The spraying process for a casement window screen profile according to claim 5, characterized in that: The longitudinal telescopic member (17) is equipped with side plates (71) on both sides. The side plates (71) are slidably connected to limit rods (72). A return spring (73) is fixed between the limit rods (72) and the side plates (71). The bottom of the bracket (14) is fixed with a ring plate (74). The ring plate (74) has a groove (75).

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