A spraying device for copper rod production

Abstract

The utility model belongs to copper pole production technical field especially relates to a spraying device for copper pole production, including frame, still include: two swivel blocks, two swivel blocks rotatory connection in the inner wall of frame, two swivel blocks are respectively established in two with the outside linkage limit slot; Rotating assembly, rotating assembly is located on the frame, and is used for driving one of swivel blocks to rotate, two fixed plates, two fixed plates fixedly connected on both sides of frame, two fixed plates are respectively established in two with the outside linkage first sliding slot, two first sliding slots are respectively slidably connected with two sliding plates, and the end of two sliding plates is respectively rotatory connection has two slide rods, and one end of two slide rods respectively extends to two limit slots, the utility model solves the problem that the two fixers arranged in the spraying device can only fix the copper pole of the same model when using, and cannot fix the copper pole of any model.

Description

Technical Field

[0001] This utility model belongs to the field of copper rod production technology, and in particular relates to a sprayer for copper rod production. Background Technology

[0002] The sprayer for copper rod production is a key piece of equipment used for surface treatment in the continuous production process of copper rods. Its core function is to form a uniform and dense protective layer (such as an anti-oxidation layer, anti-corrosion layer, etc.) on the surface of the copper rod by precisely controlling the spraying medium, so as to improve the corrosion resistance, electrical conductivity and subsequent processing performance of the copper rod.

[0003] For example, Chinese patent CN213468355U discloses a spraying device for the surface of copper rods, belonging to the field of spraying equipment technology. It includes a support base, a spraying box fixedly connected to the upper surface of the support base, a motor embedded in the left side wall of the spraying box, the power output end of the motor connected to the power input end of a first fixture, a sliding rod installed inside the spraying box, a sliding block installed on the surface of the sliding rod, a dryer and a sprayer fixedly connected to the bottom end of the sliding block (multiple dryers are present), and a storage box fixedly connected to the upper surface of the spraying box. This utility model provides a spraying device for the surface of copper rods, enabling the sprayer to spray copper rods from all directions, effectively improving the spraying quality, facilitating the later use of the copper rods, and effectively spraying the coated copper rods without the need for natural air drying, making it convenient to use and effectively improving spraying efficiency.

[0004] The aforementioned patent has the following problems:

[0005] The patent has some drawbacks in its use, such as the fact that different models of copper rods have different lengths and thicknesses, and the two internal retainers of the aforementioned spraying device can only hold copper rods of the same model, and cannot hold copper rods of any model. Therefore, we propose a sprayer for copper rod production. Utility Model Content

[0006] The purpose of this invention is to provide a sprayer for copper rod production to solve the problems mentioned in the background art.

[0007] In view of this, the present invention provides a sprayer for copper rod production, including a frame, and further comprising:

[0008] Two rotating blocks are rotatably connected to the inner wall of the frame, and each of the two rotating blocks has two limiting grooves that communicate with the outside.

[0009] A rotating assembly, located on the frame, is used to drive one of the rotating blocks to rotate;

[0010] Two fixed plates are fixedly connected to both sides of the frame. Each of the two fixed plates has two first sliding grooves that communicate with the outside. Two sliding plates are slidably connected in each of the two first sliding grooves. Two sliding rods are rotatably connected to the ends of the two sliding plates that are close to each other. One end of each sliding rod extends into two limiting grooves and is slidably connected to the two limiting grooves. Two turntables are fixedly connected to the ends of the two sliding rods that are close to each other. Multiple second sliding grooves are opened on one side of each turntable. Multiple clamping blocks are slidably connected in each of the multiple second sliding grooves.

[0011] Two adjustment components are located in two turntables respectively, and are used to drive the corresponding multiple clamping blocks to move.

[0012] A drive assembly is located between the frame and two fixed plates and is used to move the two slide plates.

[0013] Based on the above structure, the first slide groove and slide plate ensure that the slide plate can slide along the first slide groove. The limit groove, slide rod, and turntable ensure that the slide rod can rotate at one end of the slide plate and drive the turntable to slide along the limit groove. The drive component ensures that the user can drive the two slide plates closer or further apart, allowing the two turntables to fix copper rods of any length. The second slide groove and clamping blocks ensure that multiple clamping blocks can rotate in multiple second slide grooves respectively. The adjustment component ensures that the user can adjust the corresponding multiple clamping blocks closer or further apart, allowing the multiple clamping blocks to fix copper rods of any thickness.

[0014] In the above technical solution, the rotating component further includes:

[0015] The first sprocket is fixedly connected to the periphery of one of the rotating blocks;

[0016] A fixed bracket is fixedly connected to one side of the frame. A second motor is fixedly connected to the fixed bracket, and the output shaft of the second motor passes through the fixed bracket and extends into the inner cavity of the fixed bracket. A second sprocket is fixedly connected to the output shaft of the second motor, and a chain meshes between the second sprocket and the first sprocket.

[0017] In this technical solution, it is ensured that the user can drive one of the rotating blocks to rotate.

[0018] In the above technical solution, the output shaft of the second motor is rotatably connected to the fixed bracket.

[0019] In this technical solution, it is ensured that when the user starts the second motor, the output shaft of the second motor can rotate normally within the fixed bracket.

[0020] In the above technical solution, the adjustment component further includes:

[0021] A rotating groove is formed inside a turntable and connected to multiple second sliding grooves. A disc is rotatably connected inside the rotating groove. Multiple arc-shaped grooves are formed on the disc. Multiple transmission blocks are slidably connected in the multiple arc-shaped grooves. One end of each of the multiple transmission blocks extends into the multiple second sliding grooves and is fixed to multiple clamping blocks.

[0022] A gear groove is formed on the inner wall of a rotating groove and is connected to the outside. A first bevel gear and a second bevel gear are rotatably connected in the gear groove and mesh with each other. One end of the first bevel gear passes through the inner wall of the gear groove and extends into the rotating groove to be fixed to the disk. A rotating rod is fixedly connected to the second bevel gear, and one end of the rotating rod passes through the inner wall of the gear groove and extends to the outside to be rotatably connected to the rotating disk.

[0023] A threaded groove is formed on the circumference of the rotating rod, and a threaded sleeve is threadedly connected to the threaded groove.

[0024] In this technical solution, it is ensured that the user can move multiple clamping blocks.

[0025] In the above technical solution, one end of the transmission block is slidably connected to the second sliding groove.

[0026] In this technical solution, it is ensured that when the transmission block slides, one end of the transmission block can slide normally within the second groove.

[0027] In the above technical solution, one end of the first bevel gear is rotatably connected to the rotating groove.

[0028] In this technical solution, it is ensured that when the first bevel gear rotates, one end of the first bevel gear can rotate normally within the rotating groove.

[0029] In the above technical solution, the driving component further includes:

[0030] A bidirectional threaded rod is rotatably connected inside the frame, and both ends of the bidirectional threaded rod extend into two first sliding grooves and are threadedly connected to two sliding plates respectively.

[0031] The first motor is fixedly connected to one of the fixed plates, and the output shaft of the first motor passes through one of the fixed plates and extends into the first slide groove to be fixed to one end of the bidirectional threaded rod.

[0032] In this technical solution, it is ensured that the user can move the two skateboards closer to each other or further apart.

[0033] In the above technical solution, furthermore, the two threads on the bidirectional threaded rod have opposite directions of rotation and the same thread pitch.

[0034] In this technical solution, it is ensured that when the bidirectional threaded rod rotates, the two slide plates will be acted upon by the two sections of threads with opposite directions on the bidirectional threaded rod, moving closer or further apart along the two first slide grooves.

[0035] In the above technical solution, furthermore, the two ends of the bidirectional threaded rod are rotatably connected to the two first sliding grooves respectively.

[0036] In this technical solution, it is ensured that when the bidirectional threaded rod rotates, both ends of the bidirectional threaded rod can rotate normally in the two first sliding grooves respectively.

[0037] The beneficial effects of this utility model are:

[0038] 1. This sprayer for copper rod production, through the setting of a first slide groove and a slide plate, ensures that the slide plate can slide along the first slide groove. Through the setting of a limiting groove, a slide rod, and a turntable, it ensures that the slide rod can rotate at one end of the slide plate and that the slide rod can drive the turntable to slide along the limiting groove. Through the setting of a driving component, it ensures that the user can drive the two slide plates to move closer or further apart, so that the two turntables can fix copper rods of any length. Through the setting of a second slide groove and a clamping block, it ensures that multiple clamping blocks can rotate in multiple second slide grooves respectively. Through the setting of an adjustment component, it ensures that the user can adjust the corresponding multiple clamping blocks to move closer or further apart, so that the multiple clamping blocks can fix copper rods of any thickness. This solves the problem that when using a spraying device, the two fixing devices inside can only fix copper rods of the same type and cannot fix copper rods of any type.

[0039] 2. This sprayer for copper rod production ensures that two rotating blocks can rotate on the inner wall of the frame through the setting of rotating blocks. Through the setting of rotating components, it ensures that the user can drive one of the rotating blocks to rotate, so that one of the rotating blocks drives one of the slide bars to rotate, so that the two turntables can drive the copper rod to rotate. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0041] Figure 2 This is a schematic diagram of the regional structure of the slide bar in this utility model;

[0042] Figure 3 This utility model Figure 1 Enlarged structural diagram at point A in the middle;

[0043] Figure 4 This is a schematic diagram of the internal structure of the frame in this utility model;

[0044] Figure 5 This is one of the schematic diagrams of the internal structure of the turntable in this utility model;

[0045] Figure 6 This is the second schematic diagram of the internal structure of the turntable in this utility model.

[0046] The markings in the diagram are as follows:

[0047] 1. Frame; 2. Rotating block; 3. Limiting groove; 4. Slide rod; 5. Turntable; 6. Fixing plate; 7. First slide groove; 8. Slide plate; 9. Bidirectional threaded rod; 10. First motor; 11. Second slide groove; 12. Clamping block; 13. First sprocket; 14. Fixed bracket; 15. Second motor; 16. Second sprocket; 17. Chain; 18. Rotating groove; 19. Disc; 20. Arc groove; 21. Transmission block; 22. Gear groove; 23. First bevel gear; 24. Second bevel gear; 25. Rotating rod; 26. Threaded groove; 27. Threaded sleeve. Detailed Implementation

[0048] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0049] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0050] Example 1: This example provides a sprayer for copper rod production, including a frame 1, and further comprising:

[0051] Two rotating blocks 2 are rotatably connected to the inner wall of the frame 1. Each of the two rotating blocks 2 has two limiting grooves 3 that communicate with the outside.

[0052] A rotating assembly is located on the frame 1 and is used to drive one of the rotating blocks 2 to rotate.

[0053] Two fixed plates 6 are fixedly connected to both sides of the frame 1. Two first sliding grooves 7 are opened in the two fixed plates 6 respectively, which are connected to the outside. Two sliding plates 8 are slidably connected in the two first sliding grooves 7 respectively. Two sliding rods 4 are rotatably connected to the ends of the two sliding plates 8 that are close to each other. One end of the two sliding rods 4 extends into the two limiting grooves 3 respectively and is slidably connected to the two limiting grooves 3 respectively. Two turntables 5 are fixedly connected to the ends of the two sliding rods 4 that are close to each other. Multiple second sliding grooves 11 are opened on one side of the turntables 5. Multiple clamping blocks 12 are slidably connected in the multiple second sliding grooves 11 respectively.

[0054] Two adjustment components are located in two turntables 5 respectively, and are used to drive the corresponding multiple clamping blocks 12 to move.

[0055] The drive assembly is located between the frame 1 and the two fixed plates 6, and is used to move the two slide plates 8.

[0056] Example 2: This example provides a sprayer for copper rod production. In addition to the technical solutions of the above examples, it also has the following technical features: the rotating assembly includes:

[0057] The first sprocket 13 is fixedly connected to the periphery of one of the rotating blocks 2;

[0058] A fixed bracket 14 is fixedly connected to one side of the frame 1. A second motor 15 is fixedly connected to the fixed bracket 14, and the output shaft of the second motor 15 passes through the fixed bracket 14 and extends into the inner cavity of the fixed bracket 14. A second sprocket 16 is fixedly connected to the output shaft of the second motor 15, and a chain 17 meshes between the second sprocket 16 and the first sprocket 13.

[0059] In use, the user starts the second motor 15, which drives the second sprocket 16 to rotate via the output shaft of the second motor 15. The second sprocket 16 then drives the first sprocket 13 to rotate via the chain 17. The first sprocket 13 then drives one of the rotating blocks 2 to rotate, ensuring that the user can drive one of the rotating blocks 2 to rotate.

[0060] Example 3: This example provides a sprayer for copper rod production. In addition to the technical solutions of the above examples, it also has the following technical features: the output shaft of the second motor 15 is rotatably connected to the fixed bracket 14.

[0061] Specifically, it is ensured that when the user starts the second motor 15, the output shaft of the second motor 15 can rotate normally within the fixed bracket 14.

[0062] Example 4: This example provides a sprayer for copper rod production. In addition to the technical solutions of the above examples, it also has the following technical features, including an adjustment component:

[0063] Rotating groove 18 is formed in turntable 5 and connected to multiple second sliding grooves 11. A disc 19 is rotatably connected in rotating groove 18. Multiple arc-shaped grooves 20 are formed on the disc 19. Multiple transmission blocks 21 are slidably connected in the multiple arc-shaped grooves 20 respectively. One end of the multiple transmission blocks 21 extends into the multiple second sliding grooves 11 respectively and is fixed to multiple clamping blocks 12 respectively.

[0064] Gear groove 22 is formed on the inner wall of rotating groove 18 and is connected to the outside. A first bevel gear 23 and a second bevel gear 24 are rotatably connected in gear groove 22 and mesh with each other. One end of the first bevel gear 23 passes through the inner wall of gear groove 22 and extends into rotating groove 18 and is fixed to disk 19. A rotating rod 25 is fixedly connected to the second bevel gear 24 and one end of the rotating rod 25 passes through the inner wall of gear groove 22 and extends to the outside and is rotatably connected to rotating disk 5.

[0065] The threaded groove 26 is formed on the circumference of the rotating rod 25, and a threaded sleeve 27 is threadedly connected to the threaded groove 26.

[0066] In operation, the user manually rotates the rotating rod 25, causing the sliding rod 4 to rotate within the gear groove 22. This causes the second bevel gear 24 to drive the first bevel gear 23 to rotate within the gear groove 22. When the first bevel gear 23 drives the disc 19 to rotate within the rotating groove 18, the disc 19 rotates and presses multiple transmission blocks 21 through multiple arc grooves 20. These transmission blocks 21 then drive multiple clamping blocks 12 to move along multiple second sliding grooves 11, bringing the clamping blocks 12 closer together. When the clamping blocks 12 reach the appropriate position, they hold the copper rod of any thickness in place. The user then manually rotates the threaded sleeve 27, causing it to move towards the turntable 5 under the action of the threads in the threaded groove 26. This releases the threaded sleeve 27 from the pressure on the turntable 5, fixing the rotating rod 25 within the turntable 5 and preventing it from rotating. This ensures that the user can move the clamping blocks 12.

[0067] Example 5: This example provides a sprayer for copper rod production. In addition to the technical solutions of the above examples, it also has the following technical features: one end of the transmission block 21 is slidably connected to the second slide groove 11.

[0068] Specifically, it is ensured that when the transmission block 21 slides, one end of the transmission block 21 can slide normally within the second slide groove 11.

[0069] Example 6: This example provides a sprayer for copper rod production. In addition to the technical solutions of the above examples, it also has the following technical features: one end of the first bevel gear 23 is rotatably connected to the rotating groove 18.

[0070] Specifically, it is ensured that when the first bevel gear 23 rotates, one end of the first bevel gear 23 can rotate normally within the rotating groove 18.

[0071] Example 7: This example provides a sprayer for copper rod production. In addition to the technical solutions of the above examples, it also has the following technical features, including a drive component:

[0072] The bidirectional threaded rod 9 is rotatably connected inside the frame 1, and both ends of the bidirectional threaded rod 9 extend into the two first slide grooves 7 respectively, and are threadedly connected to the two slide plates 8 respectively.

[0073] The first motor 10 is fixedly connected to one of the fixed plates 6, and the output shaft of the first motor 10 passes through one of the fixed plates 6 and extends into the first slide groove 7 and is fixed to one end of the bidirectional threaded rod 9.

[0074] In use, the user starts the first motor 10, which drives the bidirectional threaded rod 9 to rotate in the frame 1 and the two first slide grooves 7. This causes the two slide plates 8 to be acted upon by the two sections of threads with opposite directions on the bidirectional threaded rod 9, moving them closer or further apart along the two first slide grooves 7. This ensures that the user can move the two slide plates 8 closer or further apart.

[0075] Example 8: This example provides a sprayer for copper rod production. In addition to the technical solutions of the above examples, it also has the following technical features: the two threads on the bidirectional threaded rod 9 have opposite directions of rotation and the same thread pitch.

[0076] Specifically, when the bidirectional threaded rod 9 rotates, the two slide plates 8 will be acted upon by the two sections of threads with opposite directions on the bidirectional threaded rod 9, moving closer or further apart along the two first slide grooves 7.

[0077] Example 9: This example provides a sprayer for copper rod production. In addition to the technical solutions of the above examples, it also has the following technical features: the two ends of the bidirectional threaded rod 9 are rotatably connected to the two first sliding grooves 7 respectively.

[0078] Specifically, it is ensured that when the bidirectional threaded rod 9 rotates, both ends of the bidirectional threaded rod 9 can rotate normally within the two first sliding grooves 7 respectively.

[0079] Working principle: When in use, the user places the copper rod in a suitable position between the two turntables 5 by hand. Then, the user starts the first motor 10, which drives the bidirectional threaded rod 9 to rotate in the frame 1 and the two first slide grooves 7. This causes the two slide plates 8 to be acted upon by the two sections of threads with opposite directions on the bidirectional threaded rod 9, moving them closer or further apart along the two first slide grooves 7. When the two slide plates 8 move closer together, they will drive the two turntables 5 to move closer together along the two limit grooves 3 through the two slide rods 4, so that the two turntables 5 can clamp the copper rod of any length.

[0080] In use, when the two turntables 5 clamp the copper rod, the user manually rotates the rotating rod 25, causing the rotating rod 25 to drive the sliding rod 4 to rotate in the gear groove 22, causing the second bevel gear 24 to drive the first bevel gear 23 to rotate in the gear groove 22. When the first bevel gear 23 drives the disc 19 to rotate in the rotating groove 18, the disc 19 will squeeze multiple transmission blocks 21 through multiple arc grooves 20, causing multiple transmission blocks 21 to drive multiple clamping blocks 12 to move along multiple second sliding grooves 11, so that multiple clamping blocks 12 move closer to each other. When multiple clamping blocks 12 move to the appropriate position, multiple clamping blocks 12 will fix the copper rod of any thickness. Then the user manually rotates the threaded sleeve 27, causing the threaded sleeve 27 to move towards the turntable 5 under the action of the threaded groove 26, so that the threaded sleeve 27 is not squeezed on the turntable 5, fixing the rotating rod 25 in the turntable 5 and preventing it from rotating, ensuring that the user can drive multiple clamping blocks 12 to move.

[0081] In use, the user starts the second motor 15, causing the output shaft of the second motor 15 to drive the second sprocket 16 to rotate. The second sprocket 16 then drives the first sprocket 13 to rotate via the chain 17. The first sprocket 13 then drives one of the rotating blocks 2 to rotate. When one of the rotating blocks 2 rotates, it drives the slide bar 4 to rotate, causing the slide bar 4 to rotate at one end of the slide plate 8. When the slide bar 4 rotates, it drives the copper rod to rotate via the turntable 5 and multiple clamping blocks 12, ensuring that the copper rod can be sprayed evenly.

[0082] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A sprayer for copper rod production, comprising a frame (1), characterized in that, Also includes: Two rotating blocks (2) are rotatably connected to the inner wall of the frame (1), and two limiting grooves (3) that communicate with the outside are respectively opened in the two rotating blocks (2). A rotating assembly, located on the frame (1), is used to drive one of the rotating blocks (2) to rotate; Two fixed plates (6) are fixedly connected to both sides of the frame (1). Two first sliding grooves (7) communicating with the outside are opened in the two fixed plates (6). Two sliding plates (8) are slidably connected in the two first sliding grooves (7). Two sliding rods (4) are rotatably connected to the two sliding plates (8) with their ends close to each other. One end of the two sliding rods (4) extends into the two limiting grooves (3) and is slidably connected to the two limiting grooves (3). Two turntables (5) are fixedly connected to the two sliding rods (4) with their ends close to each other. Multiple second sliding grooves (11) are opened on one side of the turntables (5). Multiple clamping blocks (12) are slidably connected in the multiple second sliding grooves (11). Two adjustment components are located in two turntables (5) respectively, and are used to drive the corresponding multiple clamping blocks (12) to move respectively; A drive assembly is located between the frame (1) and two fixed plates (6) and is used to move the two slide plates (8).

2. The sprayer for copper rod production according to claim 1, characterized in that, The rotating assembly includes: The first sprocket (13) is fixedly connected to the periphery of one of the rotating blocks (2); A fixed bracket (14) is fixedly connected to one side of the frame (1). A second motor (15) is fixedly connected to the fixed bracket (14), and the output shaft of the second motor (15) passes through the fixed bracket (14) and extends into the inner cavity of the fixed bracket (14). A second sprocket (16) is fixedly connected to the output shaft of the second motor (15), and a chain (17) meshes between the second sprocket (16) and the first sprocket (13).

3. A sprayer for copper rod production according to claim 2, characterized in that, The output shaft of the second motor (15) is rotatably connected to the fixed bracket (14).

4. A sprayer for copper rod production according to claim 1, characterized in that, The adjustment component includes: Rotating groove (18), the rotating groove (18) is opened in the turntable (5) and connected to multiple second sliding grooves (11), a disc (19) is rotatably connected in the rotating groove (18), multiple arc grooves (20) are opened on the disc (19), multiple transmission blocks (21) are slidably connected in the multiple arc grooves (20), and one end of the multiple transmission blocks (21) extends into the multiple second sliding grooves (11) and is fixed to multiple clamping blocks (12); Gear groove (22), the gear groove (22) is opened on the inner wall of the rotating groove (18) and is connected to the outside. A first bevel gear (23) and a second bevel gear (24) are rotatably connected in the gear groove (22), and the first bevel gear (23) and the second bevel gear (24) mesh with each other. One end of the first bevel gear (23) passes through the inner wall of the gear groove (22) and extends into the rotating groove (18) and is fixed to the disc (19). A rotating rod (25) is fixedly connected to the second bevel gear (24), and one end of the rotating rod (25) passes through the inner wall of the gear groove (22) and extends to the outside and is rotatably connected to the turntable (5). A threaded groove (26) is formed on the circumference of the rotating rod (25), and a threaded sleeve (27) is threadedly connected to the threaded groove (26).

5. A sprayer for copper rod production according to claim 4, characterized in that, One end of the transmission block (21) is slidably connected to the second slide groove (11).

6. A sprayer for copper rod production according to claim 4, characterized in that, One end of the first bevel gear (23) is rotatably connected to the rotating groove (18).

7. A sprayer for copper rod production according to claim 1, characterized in that, The driving component includes: A bidirectional threaded rod (9) is rotatably connected to the frame (1), and both ends of the bidirectional threaded rod (9) extend into two first slide grooves (7) and are threadedly connected to two slide plates (8) respectively. The first motor (10) is fixedly connected to one of the fixed plates (6), and the output shaft of the first motor (10) passes through one of the fixed plates (6) and extends into the first slide groove (7) and is fixed to one end of the bidirectional threaded rod (9).

8. A sprayer for copper rod production according to claim 7, characterized in that, The two threads on the bidirectional threaded rod (9) have opposite directions of rotation and the same thread pitch.

9. A sprayer for copper rod production according to claim 7, characterized in that, The two ends of the bidirectional threaded rod (9) are rotatably connected to the two first sliding grooves (7).

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