A thread cutting device for violin tuning knobs

Abstract

The present invention relates to the technical field of thread cutting, and specifically to a thread cutting device for violin tuning knobs, comprising: a base, an extension frame fixed to the end of the base, a cooling groove provided on the surface of the extension frame, an arc-shaped plate provided on the surface of the extension frame, a swing rod provided on the top of the base, two groups of swing rods provided, a rotating rod provided inside the swing rod, a first slot and a positioning slot provided on the surface of the swing rod, a first tooth and a second tooth provided on the surface of the rotating rod, a fixing hole provided on the end of the rotating rod, a gear provided on the top of the base, and the gear can rotate; the beneficial effect is: the holding plate contacts the button, the cylinder is turned on, the cylinder drives the piston rod to extend, the piston rod pushes the two groups of positioning plates, so that the first telescopic rod extends from the extension rod, the positioning plate is held in the positioning groove on the surface of the swing rod, the position of the swing rod is stabilized, and the stability of the tuning knob processed is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of thread cutting, in particular to a thread cutting device for a violin tuning knob. Background Art

[0002] The tuning knobs are located on the head of the violin. There are usually four of them, two on each side. By rotating the tuning knobs, you can change the tension of the strings, thereby adjusting the pitch of the strings and making the violin produce accurate tunes.

[0003] In the prior art, the patent number is CN100528440C, and the name is a thread cutting insert, which can reliably curl the chips and control their discharge direction even in the second half cycle of the radial plunge grinding method. A cutting edge is formed on the edge portion of the rake face formed on the insert body, and the cutting edge has a pair of thread cutting edges forming a convex V shape in a top view opposite to the rake face, and a wiper edge connected to the rear end of the thread cutting edge. The inner part of the convex V shape formed by the thread cutting edge in the rake face in the top view does not protrude more than the thread cutting edge, and on the rake face farther back than the wiper edge, a first protrusion protruding from the rake face, a second protrusion having a protrusion height higher than the first protrusion, and a third protrusion having a protrusion height higher than these first and second protrusions are protruded, wherein the first and second protrusions are closer to the cutting edge side than the third protrusion.

[0004] However, the existing thread cutting equipment fixes the tuning knobs and then performs thread cutting. It is necessary to remove the tuning knobs and then fix another set of tuning knobs before continuing to cut, resulting in low processing efficiency. Summary of the Invention

[0005] The object of the present invention is to provide a thread cutting device for violin tuning knobs to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a thread cutting device for a violin tuning knob, comprising:

[0007] The base has an extension frame fixed at the end thereof, a cooling groove is provided on the surface of the extension frame, an arc-shaped plate is provided on the surface of the extension frame, a swing rod is provided on the top of the base, two groups of swing rods are provided, a rotating rod is provided inside the swing rod, a first slot and a positioning slot are provided on the surface of the swing rod, a first tooth and a second tooth are provided on the surface of the rotating rod, a fixing hole is provided on the end of the rotating rod, a gear is provided on the top of the base, and the gear can rotate.

[0008] Preferably, a transverse rod is provided on one side of the base, the end of the transverse rod is connected to a pushing device, the pushing device drives the transverse rod to move, a cutter head is fixed to the other end of the transverse rod, a support rod is fixed to the surface of the base, a support bracket and a first motor are fixed to the top of the support rod, a second motor is also fixed to the top of the support rod, a rotating shaft is plugged into the inside of the support bracket, the first motor can drive the rotating shaft to rotate, the rotating rod is plugged into the inside of the swing rod, and the rotating rod can rotate inside the swing rod, and the second motor can drive the gear to rotate.

[0009] Preferably, a tuning knob is inserted into the fixing hole, and the tuning knob is fixed inside the fixing hole. Two groups of positioning grooves are provided on the surface of the swinging rod. A plurality of first teeth are fixed on the surface of the rotating rod located in the first groove, and the first teeth rotate with the rotating rod. A plurality of second teeth are fixed on the surface of the rotating rod exposed to the outside of the swinging rod, and the second teeth rotate with the rotating rod. The swinging rod rotates with the rotating shaft. When the swinging rod rotates to the surface of the gear, the teeth on the gear surface mesh with the first teeth, and the rotation of the gear can drive the rotating rod to rotate.

[0010] Preferably, a vertical plate is fixed to the surface of the base, a cylinder is fixed to the surface of the vertical plate, a piston rod is provided on the surface of the vertical plate, the cylinder can drive the piston rod to move telescopically, two sets of positioning plates are fixed to the other end of the piston rod, the positioning plates move with the piston rod, an extension rod is fixed to the surface of the vertical plate, the end of the extension rod is connected to the first telescopic rod, the first telescopic rod can move telescopically inside the extension rod, and the other end of the first telescopic rod is fixed to the surface of the positioning plate.

[0011] Preferably, an L-shaped plate is fixed on the surface of the vertical plate, and a button is provided on the surface of the L-shaped plate. The button is connected to the cylinder, and the button can drive the cylinder to work. A second telescopic rod is inserted into the surface of the L-shaped plate, and the second telescopic rod can be telescopically moved inside the L-shaped plate. A force-bearing plate is fixed to the end of the second telescopic rod, and the second telescopic rod moves with the force-bearing plate.

[0012] Preferably, a circular hole is provided on the surface of the gear, and a connecting rod is inserted into the circular hole. The connecting rod can move inside the circular hole, and a top holding plate is fixed to the end of the connecting rod. There are multiple groups of top holding plates and connecting rods. The top holding plate moves with the connecting rod, and rollers are provided on the surface of the top holding plate. There are multiple groups of rollers, and the rollers can be set on the surface of the top holding plate, and the force plate is inserted into the inside of the circular hole. When the gear rotates, due to centrifugal force, the connecting rod is inserted into the inside of the gear, and the top holding plate moves with the connecting rod and is held on the surface of the force plate, so that the second telescopic rod is inserted into the inside of the L-shaped plate, and the force plate contacts the end of the button after moving.

[0013] Preferably, two groups of connecting rods are fixed on the surface of the rotating shaft, and the other ends of the connecting rods are fixed on the surface of the swing rod. When the rotating shaft rotates, the swing rod is driven to rotate through the connecting rods.

[0014] Preferably, the surface of the extension frame is provided with multiple sets of third teeth. When the swing arm swings along with the rotating shaft, when the swing arm passes the top of the extension frame, the second teeth on the surface of the rotating rod contact the third teeth, causing the rotating rod to rotate.

[0015] Preferably, an L-shaped tube is fixed on the surface of the extension frame, an arc-shaped plate is fixed on the top of the L-shaped tube, and a brush and a water spray hole are provided on the bottom of the arc-shaped plate.

[0016] Preferably, the interior of the L-shaped tube is communicated with the interior of the extension frame, and coolant is placed inside the extension frame. The interior of the L-shaped tube is communicated with the interior of the curved plate. The driving device can make the coolant in the extension frame enter the interior of the curved plate through the L-shaped tube and be sprayed out from the water spray hole at the bottom of the curved plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention proposes that when processing the tuning knobs on the surface of one group of swing arms, the tuning knobs can be fixed in the fixing holes at the ends of the other group of swing arms, and when the swing arm rotates the surface with the gear, the gear rotates, and due to the centrifugal force, the holding plate is thrown to the middle position of the circular hole, the plug-in rod extends from the gear, and the holding plate contacts the force-bearing plate, so that the second telescopic rod is inserted into the interior of the L-shaped plate, and the holding plate contacts the button to open the cylinder, and the cylinder drives the piston rod to extend, and the piston rod pushes the two groups of positioning plates, so that the first telescopic rod extends from the extension rod, and the positioning plate is held in the positioning groove on the surface of the swing arm, so that the position of the swing arm is stabilized, thereby ensuring the stability of the tuning knob processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 This is a structural schematic diagram from another perspective of the present invention.

[0021] Figure 3 It is a bottom view structural schematic diagram of the present invention.

[0022] Figure 4 It is a schematic diagram of the swing arm structure of the present invention.

[0023] Figure 5 This is a structural schematic diagram of the extension frame of the present invention.

[0024] Figure 6 It is a schematic diagram of the cross-sectional structure of the present invention.

[0025] Figure 7 It is a schematic diagram of the vertical plate structure of the present invention.

[0026] Figure 8 This is a schematic diagram of the positioning plate structure of the present invention.

[0027] Figure 9 Based Figure 8 A magnified schematic diagram of the structure in the middle.

[0028] Figure 10 Schematic diagram of the gear structure of the present invention.

[0029] In the figure: base 1, extension frame 2, transverse rod 3, cutter head 4, support rod 5, supporting bracket 6, rotating shaft 7, swing rod 8, first slot 9, connecting rod 10, first tooth 11, positioning slot 12, rotating rod 13, second tooth 14, fixing hole 15, third tooth 16, cooling slot 17, L-shaped tube 18, arc plate 19, first motor 20, second motor 21, gear 22, piston rod 23, cylinder 24, vertical plate 25, positioning plate 26, first telescopic rod 27, extension rod 28, button 29, second telescopic rod 30, force plate 31, L-shaped plate 32, round hole 33, plug rod 34, roller 35, top holding plate 36. DETAILED DESCRIPTION

[0030] In order to clearly and completely describe the objectives and technical solutions of the present invention and make the advantages more clearly understood, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] See also Figures 1 to 10 , the present invention provides a technical solution:

[0032] Example 1: A thread cutting device for violin tuning knobs, comprising: a base 1, an extension frame 2 is fixed to the end of the base 1, a cooling groove 17 is provided on the surface of the extension frame 2, an arc plate 19 is provided on the surface of the extension frame 2, a swing rod 8 is provided on the top of the base 1, the swing rod 8 is provided with two groups, a rotating rod 13 is provided inside the swing rod 8, a first slot 9 and a positioning slot 12 are provided on the surface of the swing rod 8, a first tooth 11 and a second tooth 14 are provided on the surface of the rotating rod 13, a fixing hole 15 is provided at the end of the rotating rod 13, a gear 22 is provided on the top of the base 1, the gear 22 can rotate, when the swing rod 8 rotates the surface with the gear 22, the gear 22 rotates, due to the action of centrifugal force, the top holding plate 36 is thrown to the middle position of the circular hole 33, the plug-in rod 34 extends from the gear 22, the top holding plate 36 contacts the force-bearing plate 31, so that the second telescopic rod 30 is inserted into the inside of the L-shaped plate 32.

[0033] Embodiment 2: On the basis of embodiment 1, a transverse rod 3 is provided on one side of the base 1, and the end of the transverse rod 3 is connected to the pushing device, which drives the transverse rod 3 to move, and the other end of the transverse rod 3 is fixed with a cutter head 4, and a support rod 5 is fixed on the surface of the base 1, and a support bracket 6 and a first motor 20 are fixed on the top of the support rod 5, and a second motor 21 is also fixed on the top of the support rod 5, and a rotating shaft 7 is inserted into the interior of the supporting bracket 6, and the first motor 20 can drive the rotating shaft 7 to rotate, and the rotating rod 13 is inserted into the interior of the swing rod 8, and the rotating rod 13 can rotate inside the swing rod 8, and the second motor 21 can drive the gear 22 to rotate, and two groups of connecting rods 10 are fixed on the surface of the rotating shaft 7, and the other end of the connecting rod 10 is fixed on the surface of the swing rod 8. After the rotating shaft 7 rotates, the swing rod 8 is driven to rotate through the connecting rod 10, and a plurality of groups of third teeth 16 are provided on the surface of the extension frame 2, and the swing rod 8 rotates with When the shaft 7 swings, when the swing rod 8 passes the top of the extension frame 2, the second tooth 14 on the surface of the rotating rod 13 contacts the third tooth 16, causing the rotating rod 13 to rotate. An L-shaped tube 18 is fixed to the surface of the extension frame 2, and an arc-shaped plate 19 is fixed to the top of the L-shaped tube 18. A brush and a water spray hole are provided at the bottom of the arc-shaped plate 19. The interior of the L-shaped tube 18 is communicated with the interior of the extension frame 2. Cooling liquid is placed inside the extension frame 2. The interior of the L-shaped tube 18 is communicated with the interior of the arc-shaped plate 19. Through the driving device, the coolant in the extension frame 2 can enter the interior of the arc-shaped plate 19 through the L-shaped tube 18 and be sprayed out from the water spray hole at the bottom of the arc-shaped plate 19. There is coolant in the cooling groove 17, and the coolant is sucked into the interior of the arc-shaped plate 19 through the L-shaped tube 18. The bottom of the arc-shaped plate 19 is provided with a brush and a spray hole. The coolant is sprayed through the water spray hole at the bottom of the arc-shaped plate 19 and sprayed on the surface of the tuning knob in the fixed hole 15.

[0034] A tuning knob is inserted into the fixing hole 15, and the tuning knob is fixed inside the fixing hole 15. Two groups of positioning grooves 12 are opened on the surface of the swing rod 8. A plurality of first teeth 11 are fixed on the surface of the rotating rod 13 located in the first slot 9. The first teeth 11 rotate with the rotating rod 13. A plurality of second teeth 14 are fixed on the surface of the rotating rod 13 on one side exposed to the outside of the swing rod 8. The second teeth 14 rotate with the rotating rod 13. The swing rod 8 rotates with the rotating shaft 7. When the swing rod 8 rotates to the surface of the gear 22, the teeth on the surface of the gear 22 mesh with the first teeth 11. The rotation of the gear 22 can drive the rotating rod 13 to rotate. A circular hole 33 is provided on the surface of 22, and a connecting rod 34 is inserted into the circular hole 33. The connecting rod 34 can move inside the circular hole 33. A top holding plate 36 is fixed to the end of the connecting rod 34. There are multiple groups of top holding plates 36 and connecting rods 34. The top holding plates 36 move with the connecting rods 34. The surface of the top holding plate 36 is provided with rollers 35. There are multiple groups of rollers 35. The rollers 35 can be set on the surface of the top holding plate 36, and the force plate 31 is inserted into the inside of the circular hole 33. When the gear 22 rotates, due to centrifugal force, the connecting rod 34 is inserted into the inside of the gear 22, and the top holding plate 36 moves with the connecting rod 34 and is held on the surface of the force plate 31. The second telescopic rod 30 is inserted into the interior of the L-shaped plate 32, and the force-bearing plate 31 moves and contacts the end of the button 29. The gear 22 rotates. Due to the centrifugal force, the holding plate 36 is thrown to the middle position of the circular hole 33. The insertion rod 34 extends from the gear 22, and the holding plate 36 contacts the force-bearing plate 31, so that the second telescopic rod 30 is inserted into the interior of the L-shaped plate 32.

[0035] The surface of the base 1 is fixed with a vertical plate 25, the surface of the vertical plate 25 is fixed with a cylinder 24, the surface of the vertical plate 25 is provided with a piston rod 23, the cylinder 24 can drive the piston rod 23 to telescopically move, the other end of the piston rod 23 is fixed with two sets of positioning plates 26, the positioning plates 26 move with the piston rod 23, the surface of the vertical plate 25 is fixed with an extension rod 28, the end of the extension rod 28 is plugged with a first telescopic rod 27, the first telescopic rod 27 can telescopically move inside the extension rod 28, the other end of the first telescopic rod 27 is fixed to the surface of the positioning plate 26, the surface of the vertical plate 25 is fixed with an L-shaped plate 32, the L-shaped A button 29 is provided on the surface of the plate 32, and the button 29 is connected to the cylinder 24. The button 29 can drive the cylinder 24 to work. A second telescopic rod 30 is inserted into the surface of the L-shaped plate 32. The second telescopic rod 30 can be telescopically moved inside the L-shaped plate 32. A force-bearing plate 31 is fixed to the end of the second telescopic rod 30. The second telescopic rod 30 moves with the force-bearing plate 31, and the top holding plate 36 is thrown to the middle position of the circular hole 33. The connecting rod 34 extends from the gear 22, and the top holding plate 36 contacts the force-bearing plate 31, so that the second telescopic rod 30 is inserted into the interior of the L-shaped plate 32, and the top holding plate 36 contacts the button 29.

[0036] The traverse rod 3 drives the cutter head 4 to move to the end of the swing rod 8, and the tuning knob is inserted and fixed in the fixing hole 15. The first motor 20 drives the rotating shaft 7 to rotate. The rotating shaft 7 rotates inside the supporting frame 6, and the rotating shaft 7 drives the connecting rod 10 to rotate, so that the two sets of swing rods 8 exchange positions. The gear 22 is held in the first slot 9, and the teeth on the surface of the gear 22 mesh with the first teeth 11. The gear 22 is driven by the second motor 21 to rotate, so that the rotating rod 13 rotates with the gear 22, and the tuning knob in the fixing hole 15 rotates. The cutter head 4 performs thread cutting on the tuning knob. After cutting, the rotating shaft 7 drives the swing rod 8 to rotate. After the swing rod 8 rotates, the second teeth 14 on the surface of the rotating rod 13 contact the third teeth 16 on the surface of the extension frame 2, and the rotating rod 13 continues to rotate. There is coolant in the cooling groove 17, and the coolant is sucked into the interior of the arc plate 19 through the L-shaped tube 18. The bottom of the arc plate 19 is provided with a brush and a spray hole. The coolant The water is sprayed through the spray hole at the bottom of the arc plate 19 and sprayed on the surface of the tuning knob in the fixing hole 15. The tuning knob passes through the brush to clean the surface debris of the tuning knob. When processing the tuning knob on the surface of one group of swing rods 8, the tuning knob can be fixed in the fixing hole 15 at the end of the other group of swing rods 8. When the swing rod 8 rotates the surface with the gear 22, the gear 22 rotates. Due to the centrifugal force, the top holding plate 36 is thrown to the middle position of the circular hole 33, and the plug rod 34 is pulled out from the gear. The wheel 22 extends out, and the holding plate 36 contacts the force-bearing plate 31, so that the second telescopic rod 30 is inserted into the inside of the L-shaped plate 32. The holding plate 36 contacts the button 29, and the cylinder 24 is turned on. The cylinder 24 drives the piston rod 23 to extend, and the piston rod 23 pushes the two sets of positioning plates 26, so that the first telescopic rod 27 extends from the extension rod 28. The positioning plates 26 are held in the positioning grooves 12 on the surface of the swinging rod 8, stabilizing the position of the swinging rod 8 and ensuring the stability of the tuning knob processing.

[0037] Although the above describes the illustrative specific embodiments of the present application so that those skilled in the art can understand the present application, the present application is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present application defined and determined by the attached claims, all application creations based on the concept of the present application are protected.

Claims

1. A thread cutting device for violin tuning knobs, characterized by: include: A base (1) is provided, an extension frame (2) is fixed to the end of the base (1), a cooling groove (17) is provided on the surface of the extension frame (2), an arc plate (19) is provided on the surface of the extension frame (2), a swing rod (8) is provided on the top of the base (1), two groups of swing rods (8) are provided, a rotating rod (13) is provided inside the swing rod (8), a first slot (9) and a positioning slot (12) are provided on the surface of the swing rod (8), a first tooth (11) and a second tooth (14) are provided on the surface of the rotating rod (13), a fixing hole (15) is provided on the end of the rotating rod (13), a gear (22) is provided on the top of the base (1), the gear (22) can be rotated, a transverse rod (3) is provided on one side of the base (1), the transverse rod (3 ) is connected to a pushing device, which drives the transverse rod (3) to move. A cutter head (4) is fixed to the other end of the transverse rod (3). A support rod (5) is fixed to the surface of the base (1). A support bracket (6) and a first motor (20) are fixed to the top of the support rod (5). A second motor (21) is also fixed to the top of the support rod (5). A rotating shaft (7) is inserted into the interior of the support bracket (6). The first motor (20) can drive the rotating shaft (7) to rotate. The rotating rod (13) is inserted into the interior of the swing rod (8), and the rotating rod (13) can rotate inside the swing rod (8). The second motor (21) can drive the gear (22) to rotate. A tuning knob is inserted into the fixing hole (15), and the tuning knob is fixed to the fixing hole ( 15), the surface of the swing rod (8) is provided with two groups of positioning grooves (12), the surface of the rotating rod (13) located in the first slot (9) is fixed with multiple groups of first teeth (11), the first teeth (11) rotate along with the rotating rod (13), the surface of the rotating rod (13) exposed on the side of the swing rod (8) is fixed with multiple groups of second teeth (14), the second teeth (14) rotate along with the rotating rod (13), the swing rod (8) rotates along with the rotating shaft (7), when the swing rod (8) rotates to the surface of the gear (22), the teeth on the surface of the gear (22) mesh with the first teeth (11), the rotation of the gear (22) can drive the rotating rod (13) to rotate, the surface of the rotating shaft (7) is fixed with two groups of connecting rods (1 0), the other end of the connecting rod (10) is fixed on the surface of the swing rod (8), and after the rotating shaft (7) rotates, the swing rod (8) is driven to rotate through the connecting rod (10), and the surface of the extension frame (2) is provided with multiple sets of third teeth (16). When the swing rod (8) swings along with the rotating shaft (7), when the swing rod (8) passes the top of the extension frame (2), the second teeth (14) on the surface of the rotating rod (13) contact the third teeth (16), so that the rotating rod (13) rotates. An L-shaped tube (18) is fixed on the surface of the extension frame (2), and an arc plate (19) is fixed on the top of the L-shaped tube (18). A brush and a water spray hole are provided at the bottom of the arc plate (19). The coolant is sucked into the interior of the arc plate (19) through the L-shaped tube (18).The coolant is sprayed out through the water spray hole at the bottom of the arc plate (19) and sprayed onto the surface of the tuning knob in the fixing hole (15).

2. The thread cutting device for violin tuning knobs according to claim 1, characterized in that: A vertical plate (25) is fixed on the surface of the base (1), a cylinder (24) is fixed on the surface of the vertical plate (25), a piston rod (23) is provided on the surface of the vertical plate (25), the cylinder (24) can drive the piston rod (23) to move telescopically, two sets of positioning plates (26) are fixed to the other end of the piston rod (23), the positioning plates (26) move with the piston rod (23), an extension rod (28) is fixed on the surface of the vertical plate (25), the end of the extension rod (28) is plugged with a first telescopic rod (27), the first telescopic rod (27) can move telescopically inside the extension rod (28), and the other end of the first telescopic rod (27) is fixed to the surface of the positioning plate (26).

3. The thread cutting device for violin tuning knobs according to claim 2, characterized in that: An L-shaped plate (32) is fixed on the surface of the vertical plate (25), and a button (29) is provided on the surface of the L-shaped plate (32). The button (29) is connected to the cylinder (24), and the button (29) can drive the cylinder (24) to work. A second telescopic rod (30) is plugged into the surface of the L-shaped plate (32), and the second telescopic rod (30) can be telescopically moved inside the L-shaped plate (32). A force-bearing plate (31) is fixed at the end of the second telescopic rod (30), and the second telescopic rod (30) moves along with the force-bearing plate (31).

4. The thread cutting device for violin tuning knobs according to claim 3, characterized in that: The surface of the gear (22) is provided with a circular hole (33), a plug rod (34) is inserted into the circular hole (33), the plug rod (34) can move inside the circular hole (33), a top holding plate (36) is fixed to the end of the plug rod (34), the top holding plate (36) and the plug rod (34) are provided in multiple groups, the top holding plate (36) moves with the plug rod (34), a roller (35) is provided on the surface of the top holding plate (36), the roller (35) is provided in multiple groups, the roller (35) can be provided on the surface of the top holding plate (36), and the force plate (31) is inserted into the inside of the circular hole (33). When the gear (22) rotates, due to centrifugal force, the plug rod (34) is inserted into the inside of the gear (22), and the top holding plate (36) moves with the plug rod (34) and is supported on the surface of the force plate (31). The second telescopic rod (30) is inserted into the interior of the L-shaped plate (32), and the force-bearing plate (31) moves to contact the end of the button (29).

5. The thread cutting device for violin tuning knobs according to claim 4, characterized in that: The interior of the L-shaped tube (18) is communicated with the interior of the extension frame (2), and a coolant is placed inside the extension frame (2). The interior of the L-shaped tube (18) is communicated with the interior of the arc plate (19). The coolant in the extension frame (2) can enter the interior of the arc plate (19) through the L-shaped tube (18) by driving the device, and is sprayed out from the water spray hole at the bottom of the arc plate (19). The tuning knob passes through the brush to clean the surface debris of the tuning knob. When the tuning knob on the surface of one group of swing rods (8) is processed, the tuning knob can be fixed in the fixing hole (15) at the end of the other group of swing rods (8).

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