CN115091375A - Mixed anti-blocking feeding spray head for jet flow reinforced grinding - Google Patents

Abstract

The invention relates to the technical field of feeding spray heads, in particular to a mixing anti-blocking feeding spray head for jet flow reinforced grinding, which comprises an air inlet pipe, a mixing main pipe, a mixing auxiliary pipe and a discharge pipe which are sequentially connected, wherein a main mixing cavity is arranged in the mixing main pipe, four tangential feed inlets with coplanar axes are uniformly distributed on the outer side of the main mixing pipe in the circumferential direction and are communicated with the bottom of the main mixing cavity, a mixing anti-blocking structure is arranged in the mixing auxiliary pipe, the mixing anti-blocking structure comprises a swinging main body and a fixed part, the swing main body comprises a fixed rod and a main rotor, the main rotor is sleeved on the fixed rod and is movably connected with the fixed rod, a shifting sheet with an included angle of 60 degrees with the axis is arranged on the outer side of the main rotor, the fixed part is arranged below the swinging part, the lower end of the fixed rod is spherical, and the lower end of the fixed rod is movably clamped on the fixed part and can complete conical pendulum motion; two feed inlets which are symmetrically distributed along the axis are arranged on the outer side of the mixing auxiliary pipe.

Description

A hybrid anti-blocking feeding nozzle for jet-strengthened grinding

technical field

The invention relates to the technical field of feeding nozzles, in particular to a mixed anti-blocking feeding nozzle used for jet-strengthened grinding.

Background technique

Jet-strengthened grinding is a cold working technology, which uses the grinding spray composed of strengthened steel shot, grinding powder and grinding liquid to impinge on the surface of the workpiece to be processed evenly and at high speed under the action of high-pressure gas to achieve micro-cutting. with enhanced surface effects. After processing, residual compressive stress is generated on the surface of the workpiece, and a strengthening layer is formed, which greatly improves the strength and life of the workpiece and reduces the surface roughness.

In the process of jet-enhanced grinding, one of the keys is that the grinding spray can evenly cover the surface to be processed. When using a general nozzle for actual processing, the pre-mixed feeding is generally used (feeding after the spraying is mixed), but this will bring (1) the feeding air pressure loss caused by the bending of the feeding pipe (2) the grinding and spraying transmission after mixing. The long time on the way is affected by the tube wall, and the viscous resistance between the flow layers will cause problems such as uneven mixing. These problems lead to the fact that the jet-enhanced grinding process cannot cover the surface of the workpiece to be processed more uniformly, and the material is punched. In order to improve the processing effect, it is often necessary to adjust the angle of the nozzle to repeat processing or increase the feeding pressure, but it is accompanied by problems such as low processing efficiency and increased energy loss. Unevenness will cause a large number of steel balls to gather together or some areas are too viscous. When passing through the shrinking section of the nozzle, there will be adhesion and blockage, which not only reduces the stability and reliability of long-term processing, but also increases the difficulty of cleaning the nozzle.

Therefore, there is an urgent need for a nozzle with anti-blocking function, high mixing performance, and convenient disassembly and cleaning for enhanced grinding.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a mixed anti-blocking feeding nozzle for jet-strengthened grinding, which can solve the problems of insufficient mixing of grinding and spraying materials and pressure loss of spraying materials in the nozzle.

The invention provides a mixing anti-blocking feeding nozzle for jet-enhanced grinding, which comprises an air inlet pipe, a mixing main pipe, a mixing auxiliary pipe and a discharging pipe which are connected in sequence. Four tangential feeding ports with coplanar axes are evenly distributed on the outer side of the main pipe, and communicate with the bottom of the main mixing chamber. The tangential feeding ports are used for feeding grinding powder and grinding liquid; There is a hybrid anti-blocking structure, the hybrid anti-blocking structure includes a swing main body and a fixed part, the swing main body includes a fixed rod and a main rotor, the main rotor is sleeved on the fixed rod and is movably connected with the fixed rod, so The outer side of the main rotor is provided with a paddle with an included angle of 60° with the axis, the fixing part is arranged below the swing part, the lower end of the fixing rod is spherical, and the lower end of the fixing rod is movably clamped at the The fixed part can complete the cone pendulum movement; the outer side of the mixing auxiliary pipe is provided with two feeding ports symmetrically distributed along the axis and leading to the mixing anti-blocking structure area.

Preferably, an auxiliary rotor is also sleeved on the fixing rod below the main rotor, the auxiliary rotor is movably connected with the fixing rod, and the outer part of the auxiliary rotor is provided with a paddle in the opposite direction and the same angle as the main rotor. 's pick.

Preferably, the number of the main rotor paddles is greater than the number of the secondary rotor paddles.

Preferably, an inner flow channel is arranged inside the auxiliary rotor, a hole communicating with the inner flow channel is arranged between the auxiliary rotor paddles, and a flow channel that communicates with the inner flow channel of the auxiliary rotor is arranged inside the main rotor. road.

Preferably, the four tangential feeding ports are alternately connected to a grinding powder tank—a grinding liquid cylinder—a grinding powder tank—a grinding liquid cylinder.

Preferably, the outer side of the mixing auxiliary pipe is provided with two feed ports with an included angle of 80° with the axis, symmetrically distributed along the axis, and leading to the main rotor paddle and the auxiliary rotor in the mixing anti-blocking structure The area between the rotor blades, the feed port is used to pass the strengthened steel shot.

Preferably, the fixing component includes a fixed bottom plate and two fixed sub-plates, the fixed bottom plate is a circular plate with a hollowed-out center, crossed spokes are arranged between the circular plates, and the joint parts of the spokes are provided with The spherical lower end of the fixing rod is matched with a ball groove, the lower end of the fixing rod is clamped inside the ball groove, the fixed sub-plate is a structure that can be spliced into a circular hollow plate, and the fixed sub-plate is internally provided. There are spokes that can be spliced to form a circular hole, the diameter of the circular hole is smaller than that of the ball groove, and the circular hole is used to prevent the lower end of the fixing rod from escaping out of the ball groove.

Preferably, the upper end of the fixing rod is provided with an external thread, the auxiliary rotor is provided with a special-shaped hole in the middle, and a secondary rotating cylinder sleeved on the outer side of the fixing rod is clamped in the special-shaped hole, and the outer side of the secondary rotating cylinder is sequentially A sleeve and a main rotating cylinder matched with the main rotor are sleeved, an end cover is arranged on the upper end of the main rotating cylinder, and the end cover is fixed with the sleeve by a nut, and restricts the main rotor from being in the Axial displacement on the fixed rod.

Preferably, the main rotor and the auxiliary rotor are made of TPX plastic.

Preferably, the discharge pipe has a material spraying channel with an expansion angle of 20° inside, and the outside is connected with the fixing part of the mixing anti-blocking structure by screws and is fixedly connected with the mixing auxiliary pipe.

Beneficial effects:

1. The four tangential feeding ports of the mixing main pipe are alternately connected to the grinding powder tank - grinding liquid cylinder - grinding powder tank - grinding liquid cylinder. Through this layout, when the main mixing chamber forms a negative pressure to inhale the powder liquid, a spiral flow will be generated. , which strengthens the powder-liquid mixing effect; and the powder or liquid inhaled by each feeding port will collide with the powder or liquid inhaled by the next feeding port to achieve hedging and improve the mixing effect.

2. The swing part of the hybrid anti-blocking structure can not only make self-adaptive cone pendulum motion around the fixed part under the push of the powder-liquid mixture of the main mixing pipe; but also the main and auxiliary rotors will be driven by the spray due to the opposite direction of the paddles. Down to achieve coaxial reversal. The rotation of the main paddle will cut the powder-liquid mixture to increase the specific surface area of the mixture, which is beneficial to increase the contact range between the powder-liquid mixture and the strengthened steel shot sucked in from the feed port of the mixing sub-pipe, and enhance the mixing effect.

3. When the strengthened steel shot inhaled from the feed port of the mixing sub-pipe enters the area between the main and sub-rotor paddles, the powder-liquid mixture entering the discharge port of the main mixing pipe and the powder-liquid mixture in the inner cavity of the sub-rotor are realized. The pooled hedging in three directions is realized in the contraction section, combining speed and pressure to enhance the mixing effect. And after the steel ball enters the mixing sub-pipe, it will hit the paddle on the sub-rotor to achieve rebound acceleration.

4. The swing part of the mixing anti-blocking structure can be driven by the powder-liquid mixture in the main mixing pipe, and can make self-adaptive cone pendulum motion under the push of the spray material according to the aggregation degree of the mixture at different positions; when the main rotor rotates, it will The torque is generated, and the auxiliary rotor is used to reverse it, which offsets part of the torque, and also guides the advancement of the grinding spray. At the same time, the rotation of the main and auxiliary rotors can also drive the mixture adhered to the wall, effectively preventing clogging.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

Fig. 1 is the three-dimensional structure schematic diagram of the present invention;

Fig. 2 is the sectional view along the whole axis of the present invention;

FIG. 3 is an enlarged schematic view of the structure of the swing main body (place A) of the hybrid anti-blocking structure in the present invention;

Fig. 4 is the enlarged schematic diagram of the direction of the outlet of the present invention (place B);

Figure 5 is an enlarged schematic diagram of the three-channel hedging (place C) occurring in the mixing sub-pipe in the present invention;

6 is an exploded view of the swing main body of the hybrid anti-blocking structure in the present invention;

7 is a schematic diagram of a hybrid anti-blocking structure in the present invention;

8 is a schematic diagram of the structure of the mixed main pipe in the present invention;

FIG. 9 is a schematic structural diagram of the main rotor in the present invention;

FIG. 10 is a schematic diagram of the structure of the auxiliary rotor in the present invention.

Description of reference numerals: 1-air intake pipe, 2-mixing main pipe, 201-tangential feeding port, 3-mixing auxiliary pipe, 301-feeding port, 4-discharging pipe, 5, 7-fixed auxiliary plate, 6 -Fixed base plate, 8-fixed rod, 9-auxiliary rotor, 901-auxiliary rotor paddle, 10-main rotor, 1001-main rotor paddle, 11-auxiliary rotary drum, 12-nut, 13-end cover, 14- Main rotating barrel, 15-sleeve, 16-ball groove, 17-spoke.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc., or The positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined as "first", "second" may expressly or implicitly include one or more of said features. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be It is directly connected, or it can be indirectly connected through an intermediate medium, and it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Example 1

As shown in Figures 1-10, the present invention provides a mixed anti-blocking feeding nozzle for jet enhanced grinding. It consists of an intake pipe 1, a mixing main pipe 2, a mixing auxiliary pipe 3, a discharge pipe 4 and a mixing anti-blocking structure. The mixing main pipe 2 is formed by casting to form a main mixing cavity inside; four tangential feeding ports 201 with coplanar axes are evenly distributed on the outer circumference, and communicate with the bottom of the main mixing cavity; on the discharge side, there is an expansion angle of 4° discharge channel. The ends on both sides in the axial direction are machined with internal threads. An expansion-contraction flow channel is processed inside the air inlet pipe 1 along the flow direction of the high-pressure gas, wherein the contraction angle is 10°-15°, and the expansion angle is 13°-15°. There are two feed ports 301 on the outside of the mixing sub-pipe 3 with an included angle of 80° with the axis, symmetrically distributed along the axis, and leading to the area between the main rotor paddle 1001 and the auxiliary rotor paddle 901 in the hybrid anti-blocking structure, In this way, the effect of three-channel hedging and mixing is realized; a flow channel with a shrinkage angle of 20° is processed inside along the flow direction of the spray material. The hybrid anti-blocking structure consists of a swinging main body and a fixed part; the swinging main body is mainly composed of a fixed rod 8, an auxiliary rotor 9, and a main rotor 10; and the other end of the fixing rod is machined with external threads; there are several paddles on the outside of the auxiliary rotor 9 with an included angle of 60° with the axis. It is enough that the edge has a certain cutting effect on the fluid and the surface of the paddle has a certain rebound effect. An inner flow channel is machined inside the auxiliary rotor 9 , and a hole connecting the inner flow channel is machined between the auxiliary rotor paddles 901 ; The outer side of the auxiliary rotating drum 11 is sleeved with a sleeve 15 and a main rotating drum 14 which is matched with the main rotor 10 in sequence. The main rotor 10 is externally processed with paddles with opposite directions and equal angles to those of the secondary rotor 9; in terms of quantity, the number of paddles of the main rotor 10 is more than that of the secondary rotor 9; communicating channels. Through the above structure, the main rotor 10 and the auxiliary rotor 9 can realize coaxial reversal under the push of the spray material. The end cover 13 is fixed with the sleeve 15 by the nut 12 and limits the axial displacement of the main rotor 10 on the fixing rod 8 . The fixed part is mainly composed of a fixed base plate 6 and two fixed sub-plates 5 and 7. The fixed base plate 6 is a circular plate with a hollow in the middle. There are crossed spokes 17 between the circular plates. The joint part of the spokes 17 is provided with a fixed rod 8 The lower end of the ball is matched with the ball groove 16, the lower end of the fixed rod 8 is clamped inside the ball groove 16, the fixed sub-plates (5, 7) are oppositely arranged structures that can be spliced into a circular hollow plate, and the fixed sub-plate is internally provided with a spliced The spokes are formed with round holes. The diameter of the round holes is smaller than the diameter of the ball grooves. The round holes are used to prevent the lower end of the fixing rod 8 from escaping out of the ball grooves 16 .

The main rotor 10 and the auxiliary rotor 9 are made of low-density and wear-resistant materials, such as TPX plastic molding, so that the paddles have a longer service life. The discharge pipe 4 has a material spraying channel with an expansion angle of 20° inside, and the fixed bottom plate 6 and the fixed sub-plates 5 and 7 are connected with the external mixing sub-pipe 3 by screws.

Working process: One end of the intake pipe 1 is fed with high-pressure gas, and after being accelerated through the contraction-expansion channel, it flows out from one end of the mixing main pipe 2; this process will make the inner cavity of the mixing main pipe 2 form a negative pressure, and the bottom of the mixing main pipe 2 is connected to the bottom of the cavity. As shown in Figure 8, the tangential feeding ports 201 are alternately connected to the grinding powder tank - the grinding liquid cylinder - the grinding powder tank - the grinding liquid cylinder. Through this layout, when the inner cavity forms a negative pressure to inhale the powder liquid, a spiral flow will be generated. , and the powder or liquid inhaled by each tangential feeding port will collide with the powder or liquid inhaled by the next tangential feeding port to achieve hedging. After the grinding liquid and grinding powder are fully mixed in the main mixing chamber, they are driven by the high pressure gas and enter the mixing auxiliary pipe 3. Due to the flow of the material and the high pressure gas, the reinforced steel shot is fed from the two sides of the auxiliary mixing pipe 3. 301 is inhaled, the flow of material and gas pushes the main rotor 10 and the auxiliary rotor 9 to rotate at the same time, part of the circulation path of the powder-liquid mixture after the primary mixing flows between the main rotor 10 and the inner wall of the mixing auxiliary pipe 3, and part of the circulation path is the main rotor. 10. The inner flow channel—the inner flow channel of the auxiliary rotor 9—the small hole connected with the inner flow channel of the auxiliary rotor 9 flows out, and realizes the pooling and hedging in three directions with the incoming strengthened steel shot, as shown in Figure 5. The required grinding spray material flows out from the discharge pipe 4.

Specifically, a hybrid anti-blocking structure;

The mixed anti-blocking structure consists of a swinging main body and a fixed part; the fixed part consists of a fixed bottom plate 6, fixed sub-plates 5 and 7, and its center is a ball groove that can fix the fixed rod 8. After mixing from the mixing main pipe 2, the powder liquid Under the action of the mixture and the high-pressure gas introduced into the intake pipe 1, the fixed rod 8 can perform self-adaptive cone pendulum motion, and the main rotor 10 and the auxiliary rotor 9 on it perform coaxial reversal motion.

Specifically, the fixed rod 8 performs adaptive cone pendulum motion and the rotational motion of the main rotor 10 and the auxiliary rotor 9;

Since the material transmission is affected by the pipe wall, there will be viscous resistance, the speed of different flow layers is inconsistent, and because the grinding spray has a certain possibility of sticking to the pipe wall, the transmission in the circular pipe will show a faster intermediate speed. , the fluid near the pipe wall is slow, which may lead to the occurrence of clogging; therefore, the cone pendulum motion and the rotation of the main rotor 10 and the auxiliary rotor 9 are used to make the material adhered to the pipe wall fall off, and according to the The flow of the fluid determines the movement of the cone pendulum to achieve uniform transmission and prevent clogging.

Specifically, the coaxial rotation of the main rotor 10 and the auxiliary rotor 9 is reversed;

Utilizing the difference in the direction of the blades of the main rotor 10 and the sub-rotor 9, under the push of the high-pressure gas and the powder-liquid mixture, the coaxial and different rotations are realized. Since the rotation of the main rotor 10 will bring torque, the fixed plate 8 will be inclined to one side, so the auxiliary rotor 9 is added to offset a part of the torque, and it can improve the phenomenon of fluid vortex on the edge of the main rotor 10, and enhance the feeding speed. , to reduce the impact of insufficient air pressure.

Specifically, the paddles of the main rotor 10 and the sub-rotor 9

Using the edge of the main rotor 10 to cut the powder-liquid mixture, the specific surface area of the mixture is increased, which is beneficial to improve the contact range between the powder-liquid mixture and the strengthened steel shot sucked from the feed port of the mixing sub-pipe 3, and combined with the fixing rod 8 to automatically The adapted cone pendulum movement paddle can scrape off the powder particles that stick to the pipe wall. The reinforced steel shot entering from the mixing sub-pipe 3 is rebounded by the paddle surface of the auxiliary rotor to accelerate the steel shot. The number of picks of the main rotor 10 and the auxiliary rotor 9: the number of picks of the main rotor 10 is more than that of the auxiliary rotor 9 to prevent the reinforced steel shot from moving in the opposite direction of the discharge.

Specifically, the three-channel hedging in the mixing sub-pipe 3;

A part of the powder-liquid mixing flow path flows out from the main rotor 10 inner flow channel - the auxiliary rotor 9 inner flow channel - the auxiliary rotor 9 inner flow channel is connected to the small hole, and realizes the convergence in three directions with the incoming strengthened steel shot on the shrinking section Hedging is shown in Figure 5. Use the acceleration and hedging of the contraction section to enhance the mixing effect.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (10)

1. A mixing anti-blocking feeding spray head for jet flow reinforced grinding is characterized by comprising an air inlet pipe, a mixing main pipe, a mixing auxiliary pipe and a discharge pipe which are sequentially connected, wherein a main mixing cavity is arranged in the mixing main pipe, four tangential feed inlets with coplanar axes are uniformly distributed in the circumferential direction of the outer side of the mixing main pipe and are communicated with the bottom of the main mixing cavity, and the tangential feed inlets are used for introducing grinding powder and grinding liquid; a mixing anti-blocking structure is arranged in the mixing auxiliary pipe and comprises a swinging main body and a fixing part, the swinging main body comprises a fixing rod and a main rotor, the main rotor is sleeved on the fixing rod and is movably connected with the fixing rod, a shifting sheet with an included angle of 60 degrees with an axis is arranged on the outer side of the main rotor, the fixing part is arranged below the swinging part, the lower end of the fixing rod is spherical, and the lower end of the fixing rod is movably clamped on the fixing part and can complete conical pendulum motion; two feed inlets which are symmetrically distributed along the axis are arranged on the outer side of the mixing auxiliary pipe and lead to the mixing anti-blocking structure area.

2. The mixing anti-clogging feeding nozzle for jet flow reinforced grinding as claimed in claim 1, wherein an auxiliary rotor is further sleeved on the fixing rod below the main rotor, the auxiliary rotor is movably connected with the fixing rod, and a shifting piece with the direction opposite to that of the shifting piece of the main rotor and the angle equal to that of the shifting piece of the main rotor is arranged outside the auxiliary rotor.

3. The mixing anti-clogging feed nozzle for jet enhanced milling of claim 2, wherein the number of main rotor blades is greater than the number of sub rotor blades.

4. The mixing and anti-blocking feed nozzle for jet flow enhanced grinding as claimed in claim 3, wherein an inner flow passage is provided inside the auxiliary rotor, a hole communicating with the inner flow passage is provided between the auxiliary rotor plectrums, and a flow passage communicating with the inner flow passage of the auxiliary rotor is provided inside the main rotor.

5. The mixing and anti-clogging feeding nozzle for jet flow enhanced grinding as claimed in claim 4, wherein the four tangential feeding ports are alternately connected with a grinding powder tank, a grinding fluid cylinder, a grinding powder tank and a grinding fluid cylinder.

6. The mixing anti-blocking feeding spray head for jet flow reinforced grinding according to claim 5, characterized in that two feeding ports which have an included angle of 80 degrees with an axis and are symmetrically distributed along the axis are arranged outside the mixing auxiliary pipe and lead to an area between the main rotor shifting piece and the auxiliary rotor shifting piece in the mixing anti-blocking structure, and the feeding ports are used for feeding reinforced steel shots.

7. The mixing anti-blocking feeding nozzle for jet flow reinforced grinding as claimed in claim 6, wherein the fixing component comprises a fixing bottom plate and two fixing sub-plates, the fixing bottom plate is a circular plate with a hollowed middle part, crossed spokes are arranged between the circular plates, a ball groove matched with the spherical lower end of the fixing rod is arranged at the joint part of the spokes, the lower end of the fixing rod is clamped inside the ball groove, the fixing sub-plates are oppositely arranged and can be spliced into a circular hollowed plate structure, the spokes which can be spliced into a round hole are arranged inside the fixing sub-plates, the diameter of the round hole is smaller than that of the ball groove, and the round hole is used for preventing the lower end of the fixing rod from escaping from the ball groove.

8. The mixed anti-blocking feeding nozzle for jet flow reinforced grinding as claimed in claim 7, wherein the upper end of the fixing rod is provided with external threads, the middle of the auxiliary rotor is provided with a special-shaped hole, and an auxiliary rotating cylinder sleeved outside the fixing rod is clamped in the special-shaped hole, a sleeve and a main rotating cylinder matched with the main rotor are sequentially sleeved outside the auxiliary rotating cylinder, an end cover is arranged at the upper end of the main rotating cylinder, and the end cover is fixed with the sleeve through a nut and limits the axial displacement of the main rotor on the fixing rod.

9. The mixing anti-clogging feed nozzle for jet enhanced milling of claim 2, wherein said main rotor and said sub-rotor are made of TPX plastic.

10. The mixing anti-blocking material feeding nozzle for jet enhanced grinding according to claim 2, characterized in that the discharging tube has a material feeding channel with an angle of 20 ° and is externally connected with the fixing component of the mixing anti-blocking structure and fixedly connected with the mixing secondary tube by a screw.

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