Aluminum alloy anti-corrosion electrostatic spraying powder grinding treatment device and treatment method thereof

Abstract

The invention discloses an aluminum alloy anti-corrosion electrostatic spraying powder grinding treatment device and a treatment method thereof, and belongs to the field of aluminum alloy anti-corrosion treatment. The device comprises a bottom plate, a storage box capable of sliding back and forth is arranged at the upper end of the bottom plate, a second filter box is fixedly communicated with the upper end of the storage box, a first filter box is fixedly communicated with the upper end of the second filter box, a grinding box is fixedly communicated with the upper end of the first filter box, and a baffle assembly is arranged on the grinding box and comprises two baffles capable of synchronously and reversely sliding; the lower end of the grinding box can be blocked; a grinding assembly is arranged at the upper end of the grinding box, and a grinding disc capable of ascending, descending and rotating is arranged in the grinding assembly. And a plurality of first filtering holes and second filtering holes are formed in the bottoms of the first filtering box and the second filtering box correspondingly, the hole diameter of the first filtering holes is consistent with the upper limit of the powder particle size, and the hole diameter of the second filtering holes is consistent with the lower limit of the powder particle size, so that powder screening is achieved, and the situation that the powder particle size is too large or too small, and subsequent spraying use is affected is avoided.

Description

Technical Field

[0001] The invention belongs to the field of aluminum alloy anti-corrosion treatment, and specifically relates to an aluminum alloy anti-corrosion electrostatic spraying powder grinding treatment device and a treatment method thereof. Background Art

[0002] Aluminum alloy is a widely used material. In practical applications, it is prone to corrosion due to its negative potential properties, especially when in contact with other metals, which will aggravate the corrosion of aluminum. Therefore, surface treatment of aluminum alloy to improve its anti-corrosion performance is a key step to extend its service life. Electrostatic powder spraying is a commonly used aluminum alloy surface treatment technology. It uses a spray gun to spray anti-corrosion electrostatic spray powder on the surface of aluminum alloy, which can not only provide good anti-corrosion performance, but also increase the aesthetics and weather resistance of the product.

[0003] Before anti-corrosion electrostatic spray powder is used, it usually needs to be ground; because the grinding process helps to obtain finer and more uniform powder particles, thereby improving the quality and performance of the powder and optimizing the particle size distribution of the powder, which is crucial to the final effect and performance of the powder coating.

[0004] However, the particle size of the powder after grinding is an important parameter. The particle size of the powder directly affects the spraying effect and the quality of the coating. The particle size is affected by factors such as powder fluidity, coating properties and spray gun clogging. If the powder particles are too large, it may cause the powder to rebound during the spraying process and it is not easy to adhere to the aluminum alloy surface, thereby reducing the powder coating rate. On the contrary, if the powder particles are too small, although the powder coating rate may be increased, it may cause the coating to become thicker after spraying, affecting the flatness and smoothness of the coating. Therefore, it is very important to control the particle size of the powder. For this reason, an aluminum alloy anti-corrosion electrostatic spray powder grinding processing device is proposed. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an aluminum alloy anti-corrosion electrostatic spray powder grinding processing device and a processing method thereof, which solves the problems in the prior art.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] Aluminum alloy anti-corrosion electrostatic spray powder grinding processing device, including a bottom plate, a storage box capable of reciprocating sliding is arranged on the upper end of the bottom plate, a second filter box is connected and fixed on the upper end of the storage box, the second filter box is connected and fixed on the upper end of the first filter box, the first filter box is connected and fixed on the upper end of the grinding box, a baffle assembly is arranged on the grinding box, the baffle assembly includes two baffles capable of synchronously sliding in opposite directions, and can block the lower end of the grinding box; a grinding assembly is arranged on the upper end of the grinding box, a grinding disc capable of lifting and rotating is arranged in the grinding assembly, and the grinding disc can cooperate with the inner cavity of the grinding box;

[0008] The bottom of the first filter box and the second filter box are respectively provided with a plurality of first filter holes, the aperture of the first filter hole is consistent with the upper limit of the powder particle size, and the aperture of the second filter hole is consistent with the lower limit of the powder particle size, so as to screen the powder and avoid the powder particle size being too large or too small, which affects its subsequent spraying use.

[0009] Furthermore, the grinding assembly includes a support rod rotatably connected to the grinding box, a support plate is fixed on the support rod, a first cylinder is fixed on the support plate, a drive motor is fixed to the end of the drive shaft of the first cylinder, and a grinding disc that can cooperate with the inner cavity of the grinding box is fixed on the drive shaft of the drive motor.

[0010] Furthermore, mounting grooves are respectively provided on both sides of the filter box, and the two baffles are respectively slidably matched with the two mounting grooves; a connecting plate is respectively arranged on the two baffles, and two first fixed plates are arranged on the outside of the grinding box, and a rotatable first screw rod is arranged between the two first fixed plates, and a first external thread and a second external thread with opposite rotation directions and equal pitches are respectively arranged at both ends of the first screw rod, and the first external thread and the second external thread respectively pass through the two connecting plates and are threadedly connected thereto.

[0011] Furthermore, the thread lead angles of the first external thread and the second external thread are both smaller than the equivalent friction angle.

[0012] Furthermore, a unloading assembly is provided in the second filter box, and the unloading assembly includes a scraper that slides in cooperation with the second filter box, a fixing rod is fixed on the scraper, a sealing plate is fixed on the fixing rod, and a unloading port is opened on one side of the second filter box. When the scraper is located on the side away from the unloading port, the sealing plate can completely block the unloading port.

[0013] Furthermore, a connecting block is provided on one side of the scraper, two second fixing plates are provided on the second filter box, a rotatable second screw rod is provided between the two second fixing plates, and the second screw rod passes through the connecting block and is threadedly connected thereto.

[0014] Furthermore, the thread lead angle of the second screw is smaller than the equivalent friction angle.

[0015] Furthermore, a suction pipe assembly is arranged on the first filter box, and the suction pipe assembly includes a support frame fixed at the upper end of the first filter box, an air suction pipe is rotatably connected to the support frame, a hose is connected to the lower end of the air suction pipe, a bent pipe is fixed to the lower end of the hose, the bent pipe extends into the first filter box and is connected to a suction nozzle at the end, a spray pipe is arranged on the air suction pipe, and an air suction pump is installed on the air suction pipe, and under the action of the air suction pump, the powder in the first filter box can be sucked away and discharged from the spray pipe.

[0016] Furthermore, a driving assembly is arranged on the outside of the grinding box, and the driving assembly includes two gears respectively fixed on the suction pipe and the support rod, the support rod is rotatably connected to the grinding box, a second cylinder is fixed on the outside of the grinding box, a connecting frame is fixed on the driving shaft of the second cylinder, two racks are fixed on the connecting frame, and the two racks are respectively meshed with the two gears;

[0017] Driven by the second cylinder, the connecting frame approaches the grinding box. At this time, the air intake pipe and the support rod rotate synchronously in opposite directions, so that when the spray pipe approaches the grinding box, the grinding disc rotates outward, and interference between the spray pipe and the grinding disc can be avoided.

[0018] Beneficial effects of the present invention:

[0019] 1. By sequentially arranging the first filter box and the second filter box at the lower end of the grinding box, and the aperture of the first filter hole is consistent with the upper limit of the powder particle size, and the aperture of the second filter hole is consistent with the lower limit of the powder particle size, the ground powder is filtered through the first filter hole, and the powder exceeding the upper limit of the particle size is intercepted, and the powder smaller than the upper limit of the particle size falls into the second filter box, and the powder smaller than the lower limit of the particle size passes through the second filter hole into the storage box, and the qualified powder particles with a particle position range between the upper limit and the lower limit of the particle size stay in the second filter box, thereby realizing the screening of the powder to avoid the powder particle size being too large or too small, which affects its subsequent spraying use.

[0020] 2. By arranging a straw assembly on the first filter box, the powder particles in the first filter box can be recovered into the grinding box for secondary grinding to avoid powder waste.

[0021] 3. By setting a driving assembly on the outside of the grinding box, the suction pipe can be driven to rotate while controlling the grinding assembly to avoid collision and interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the grinding device of the present invention;

[0024] Figure 2 It is a schematic diagram of the grinding box structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the baffle assembly of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the grinding assembly of the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the first filter box of the present invention;

[0028] Figure 6 It is a schematic structural diagram of the second filter box of the present invention;

[0029] Figure 7 It is a schematic diagram of the structure of the unloading assembly of the present invention;

[0030] Figure 8 is a schematic diagram of the structure of the straw assembly of the present invention;

[0031] Fig. 9 It is a schematic diagram of the structure of the driving component of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1 As shown, the aluminum alloy anti-corrosion electrostatic spray powder grinding processing device comprises a bottom plate 1, a reciprocatingly slidable storage box 2 is arranged on the upper end of the bottom plate 1, a second filter box 3 is connected and fixed to the upper end of the storage box 2, a first filter box 5 is connected and fixed to the upper end of the second filter box 3, a grinding box 6 is connected and fixed to the upper end of the first filter box 5, and the powder particles are ground in the grinding box 6, and after grinding, they pass through the first filter box 5 and the second filter box 3 in sequence, and finally fall into the storage box 2, and the powder particles are accelerated to be filtered and screened in the first filter box 5 and the second filter box 3 under the reciprocating motion of the storage box 2;

[0034] In this embodiment, if Figure 5 and Figure 6 As shown, the bottom of the first filter box 5 and the bottom of the second filter box 3 are respectively provided with a plurality of first filter holes 51 and second filter holes 31, the aperture of the first filter hole 51 is consistent with the upper limit of the powder particle size, and the aperture of the second filter hole 31 is consistent with the lower limit of the powder particle size; after the ground powder is filtered through the first filter hole 51, the powder exceeding the upper limit of the particle size is intercepted, and the powder smaller than the upper limit of the particle size falls into the second filter box 3, and the powder smaller than the lower limit of the particle size passes through the second filter hole 31 into the storage box 2, while the qualified powder particles with a particle position range between the upper limit and the lower limit of the particle size stay in the second filter box 3, thereby realizing the screening of the powder to avoid the powder particle size being too large or too small, which affects its subsequent spraying use.

[0035] In this embodiment, a hydraulic cylinder 11 is disposed at the upper end of the bottom plate 1 to directly drive the storage box 2 to slide back and forth on the bottom plate 1 to accelerate filtering.

[0036] The filter box 6 is provided with a baffle assembly 7 to seal the lower end of the filter box 6 to facilitate powder grinding; Figure 2 and Figure 3 As shown, mounting grooves 61 are respectively provided on both sides of the filter box 6, and the baffle assembly 7 includes two baffles 71 that can slide synchronously in opposite directions, and the two baffles 71 are respectively slidably matched with the two mounting grooves 61, and when the two baffles 71 are combined, the lower end of the filter box 6 can be blocked; and when the two baffles 71 are separated from each other, the ground powder can be released into the first filter box 5;

[0037] In this embodiment, a connecting plate 72 is respectively provided on the two baffles 71, two first fixed plates 62 are provided on the outer side of the grinding box 6, a first screw rod 73 is rotatably connected between the two first fixed plates 62, and first external threads 731 and second external threads 732 with opposite rotation directions and equal pitches are respectively provided at both ends of the first screw rod 73, the first external threads 731 and the second external threads 732 respectively penetrate the two connecting plates 72 and are threadedly connected thereto, and a motor is provided on one of the first fixed plates 62 to drive the first screw rod 73 to rotate, so that the synchronous reverse sliding of the two baffles 71 can be achieved;

[0038] In order to ensure that the positions of the two baffles 71 remain stable after adjustment, the first screw rod 73 needs to have self-locking properties, that is, the thread lead angles of the first external thread 731 and the second external thread 732 are both smaller than the equivalent friction angle.

[0039] In other embodiments, two cylinders may be provided on the grinding box 6 to drive the two baffles 71 to slide synchronously in opposite directions.

[0040] The upper end of the grinding box 6 is provided with a grinding assembly 8, such as Figure 4 As shown, the grinding assembly 8 includes a support rod 81 installed on the upper end of the grinding box 6, a support plate 82 is fixed to the upper end of the support rod 81, a first cylinder 83 is fixed on the support plate 82, a drive motor 84 is fixed to the end of the drive shaft of the first cylinder 83, and a grinding disc 85 that can cooperate with the inner cavity of the grinding box 6 is fixed on the drive shaft of the drive motor 84. When in use, the grinding disc 85 is controlled to descend to contact with the powder at the upper end of the baffle 71, and then the grinding disc 85 is controlled to rotate to perform the grinding operation.

[0041] The second filter box 3 is provided with a discharge assembly 4 to take out the qualified powder; Figure 6 and Figure 7As shown, a discharge port 32 is provided on one side of the second filter box 3, and qualified powder can be taken out from the discharge port 32; the discharge assembly 4 includes a scraper 41 that slides with the second filter box 3, a fixing rod 42 is fixed on the scraper 41, and a sealing plate 43 is fixed on the fixing rod 42. When the scraper 41 is located at a side away from the discharge port 32, the sealing plate 43 can completely block the discharge port 32; by controlling the scraper 41 to slide, the crab stick opening 32 can be opened and the powder in the second filter box 3 can be pushed out;

[0042] In this embodiment, a connecting block 411 is provided on one side of the scraper 41, and two second fixed plates 33 are provided on the second filter box 3. A second screw rod 44 is rotatably connected between the two second fixed plates 33. The second screw rod 44 passes through the connecting block 411 and is threadedly connected thereto. By arranging a motor on one of the second fixed plates 33 to drive the second screw rod 44 to rotate, the scraper 41 can be driven to slide. In order to ensure that the scraper 41 remains stable after the position is adjusted, the second screw rod 44 needs to have self-locking properties, that is, the thread lead angle of the second screw rod 44 is smaller than the equivalent friction angle.

[0043] In other embodiments, a telescopic rod or a cylinder may be provided to directly drive the scraper 41 to slide.

[0044] It is worth mentioning that the powder particles in the first filter box 5 are relatively large and can meet the particle size requirements after secondary grinding. Therefore, a straw assembly 9 is provided on the first filter box 5. The straw assembly 9 can recycle the powder particles in the first filter box 5 into the grinding box 6 for secondary grinding to avoid powder waste.

[0045] like Figure 8 As shown, the suction pipe assembly 9 includes a support frame 91 fixed on the upper end of the first filter box 5, and an air suction pipe 92 is rotatably connected to the support frame 91. The lower end of the air suction pipe 92 is connected to a hose 93, and a bent pipe 94 is fixed to the lower end of the hose 93. The bent pipe 94 extends into the first filter box 5 and is connected to a suction nozzle 95 at the end. A spray pipe 96 is arranged on the air suction pipe 92, and an air suction pump is installed on the air suction pipe 92. Under the action of the air suction pump, the powder in the first filter box 5 can be sucked away and discharged from the spray pipe 96. By controlling the rotation of the air suction pipe 92, the spray pipe 96 can be aligned with the inner cavity of the grinding box 6, and the powder recovery secondary grinding can be completed.

[0046] However, if the grinding assembly 8 is not controlled to avoid the rotation of the suction pipe 92 at the same time, the spray pipe 96 will collide with the grinding assembly 8. Therefore, in this embodiment, a driving assembly 10 is provided on the outside of the grinding box 6 to drive the suction pipe 92 to rotate and control the grinding assembly 8 (grinding disc 85) to avoid the rotation.

[0047] like Fig. 9As shown, the driving assembly 10 includes two gears 101 respectively fixed on the suction pipe 92 and the support rod 81, the support rod 81 is rotatably connected to the grinding box 6, a second cylinder 104 is fixed to the outside of the grinding box 6, a connecting frame 102 is fixed on the driving shaft of the second cylinder 104, two racks 103 are fixed on the connecting frame 102, and the two racks 103 are respectively engaged with the two gears 101; driven by the second cylinder 104, the connecting frame 102 approaches the grinding box 6, and the suction pipe 92 and the support rod 81 rotate synchronously in opposite directions, so that when the spray pipe 96 approaches the grinding box 6, the grinding disc 85 rotates beyond the outside to avoid interference between the spray pipe 96 and the grinding disc 85.

[0048] Aluminum alloy anti-corrosion electrostatic spray powder grinding treatment method, comprising the following steps:

[0049] S1, control the two baffles 71 to merge to block the lower end of the grinding box 6, then put the powder into the grinding box 6, and then control the grinding assembly 8 to run for grinding;

[0050] S2, after grinding is completed, the two baffles 71 are controlled to separate, and the storage box 2 is controlled to slide back and forth, and the powder is filtered through the first filter box 5 and the second filter box 3 in sequence; the qualified powder stays in the second filter box 3;

[0051] S3, after the filtration is completed, the storage box 2 is controlled to stop reciprocating sliding, and the unloading assembly 4 is controlled to take out the powder in the second filter box 3;

[0052] S4, control the two baffles 71 to merge, then control the driving assembly 10 to operate, rotate the spray switch 96 to align with the inner cavity of the grinding box 6, then open the suction pump to recover the powder in the first filter box 5 into the grinding box 6 for secondary grinding.

[0053] Working principle:

[0054] By sequentially arranging the first filter box 5 and the second filter box 3 at the lower end of the grinding box 6, and the aperture of the first filter hole 51 is consistent with the upper limit of the powder particle size, and the aperture of the second filter hole 31 is consistent with the lower limit of the powder particle size, after the ground powder is filtered through the first filter hole 51, the powder exceeding the upper limit of the particle size is intercepted, and the powder smaller than the upper limit of the particle size falls into the second filter box 3, and the powder smaller than the lower limit of the particle size passes through the second filter hole 31 and enters the storage box 2, while the qualified powder particles with a particle position range between the upper limit and the lower limit of the particle size stay in the second filter box 3, so as to realize the screening of the powder and avoid the powder particle size being too large or too small, which affects its subsequent spraying use. By arranging the suction pipe assembly 9 on the first filter box 5, the powder particles in the first filter box 5 are recovered to the grinding box 6 for secondary grinding to avoid powder waste. By arranging the driving assembly 10 on the outside of the grinding box 6, the grinding assembly 8 is controlled to avoid collision interference while driving the suction pipe 92 to rotate.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. Aluminum alloy anti-corrosion electrostatic spray powder grinding processing device, comprising a bottom plate (1), characterized in that: A storage box (2) capable of reciprocating sliding is arranged at the upper end of the bottom plate (1); a second filter box (3) is connected and fixed to the upper end of the storage box (2); a first filter box (5) is connected and fixed to the upper end of the second filter box (3); a grinding box (6) is connected and fixed to the upper end of the first filter box (5); a baffle assembly (7) is arranged on the grinding box (6); the baffle assembly (7) comprises two baffles (71) capable of synchronously sliding in opposite directions and capable of blocking the lower end of the grinding box (6); a grinding assembly (8) is arranged on the upper end of the grinding box (6); a grinding disc (85) capable of lifting and rotating is arranged in the grinding assembly (8); the grinding disc (85) is capable of cooperating with the inner cavity of the grinding box (6); The bottoms of the first filter box (5) and the second filter box (3) are respectively provided with a plurality of first filter holes (51) and a plurality of second filter holes (31); the aperture of the first filter holes (51) is consistent with the upper limit of the powder particle size, and the aperture of the second filter holes (31) is consistent with the lower limit of the powder particle size.

2. The aluminum alloy anti-corrosion electrostatic spraying powder grinding processing device according to claim 1 is characterized in that: The grinding assembly (8) comprises a support rod (81) rotatably connected to the grinding box (6); a support plate (82) is fixed on the support rod (81); a first cylinder (83) is fixed on the support plate (82); a drive motor (84) is fixed to the end of the drive shaft of the first cylinder (83); a grinding disc (85) capable of cooperating with the inner cavity of the grinding box (6) is fixed on the drive shaft of the drive motor (84).

3. The aluminum alloy anti-corrosion electrostatic spraying powder grinding processing device according to claim 1 is characterized in that: The filter box (6) is provided with mounting grooves (61) on both sides, and the two baffles (71) are respectively slidably matched with the two mounting grooves (61); a connecting plate (72) is respectively provided on the two baffles (71); two first fixing plates (62) are provided on the outside of the grinding box (6); a rotatable first screw rod (73) is provided between the two first fixing plates (62); the two ends of the first screw rod (73) are respectively provided with a first external thread (731) and a second external thread (732) with opposite rotation directions and equal pitches; the first external thread (731) and the second external thread (732) respectively penetrate the two connecting plates (72) and are threadedly connected thereto.

4. The aluminum alloy anti-corrosion electrostatic spray powder grinding treatment device according to claim 3 is characterized in that: The thread lead angles of the first external thread (731) and the second external thread (732) are both smaller than the equivalent friction angle.

5. The aluminum alloy anti-corrosion electrostatic spray powder grinding treatment device according to claim 1 is characterized in that: The second filter box (3) is provided with a discharge assembly (4), the discharge assembly (4) comprising a scraper (41) that slides in cooperation with the second filter box (3), a fixing rod (42) being fixed on the scraper (41), a sealing plate (43) being fixed on the fixing rod (42), a discharge port (32) being provided on one side of the second filter box (3), and when the scraper (41) is located on a side away from the discharge port (32), the sealing plate (43) can completely block the discharge port (32).

6. The aluminum alloy anti-corrosion electrostatic spray powder grinding treatment device according to claim 5 is characterized in that: A connecting block (411) is provided on one side of the scraper (41), two second fixing plates (33) are provided on the second filter box (3), a rotatable second screw rod (44) is provided between the two second fixing plates (33), and the second screw rod (44) passes through the connecting block (411) and is threadedly connected thereto.

7. The aluminum alloy anti-corrosion electrostatic spray powder grinding treatment device according to claim 6 is characterized in that: The thread lead angle of the second screw rod (44) is smaller than the equivalent friction angle.

8. The aluminum alloy anti-corrosion electrostatic spray powder grinding treatment device according to claim 2 is characterized in that: A suction pipe assembly (9) is arranged on the first filter box (5), and the suction pipe assembly (9) comprises a support frame (91) fixed at the upper end of the first filter box (5), an air suction pipe (92) is rotatably connected to the support frame (91), a hose (93) is connected to the lower end of the air suction pipe (92), a curved pipe (94) is fixed to the lower end of the hose (93), the curved pipe (94) extends into the first filter box (5) and is connected to a suction nozzle (95) at the end, a spray pipe (96) is arranged on the air suction pipe (92), and an air suction pump is installed on the air suction pipe (92), under the action of the air suction pump, the powder in the first filter box (5) can be sucked away and discharged from the spray pipe (96).

9. The aluminum alloy anti-corrosion electrostatic spray powder grinding treatment device according to claim 8, characterized in that: A driving assembly (10) is arranged on the outside of the grinding box (6), the driving assembly (10) comprising two gears (101) respectively fixed on the suction pipe (92) and the support rod (81), the support rod (81) being rotatably connected to the grinding box (6), a second cylinder (104) being fixed on the outside of the grinding box (6), a connecting frame (102) being fixed on the driving shaft of the second cylinder (104), two racks (103) being fixed on the connecting frame (102), the two racks (103) being respectively meshed with the two gears (101); Driven by the second cylinder (104), the connecting frame (102) approaches the grinding box (6), and at this time, the air intake pipe (92) and the support rod (81) rotate synchronously in opposite directions, so that when the injection pipe (96) approaches the grinding box (6), the grinding disc (85) rotates to the outside, and the interference between the injection pipe (96) and the grinding disc (85) can be avoided.

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