Venturi tube anti-flash-rust agent filling mechanism

Abstract

The invention provides a Venturi tube anti-flash-rust agent filling mechanism which comprises a Venturi jet device, the inside of the Venturi jet device is sequentially provided with a first inlet section, a first contraction section, a first throat part and a first diffusion section from left to right, the first inlet section is cylindrical, the first contraction section is gradually contracted from the tail end of the first inlet section, and the first throat part is communicated with the first diffusion section. The first throat part is the position with the smallest pipe diameter, and the first diffusion section is gradually enlarged from the tail end of the first throat part. Compared with the prior art, the device has the following beneficial effects that the independent mixing mechanism is arranged, the mixing cylinder is integrated at the joint of the venturi jet device and the venturi flow meter, and not only is the mixing impeller arranged in the cylinder, but also the baffle plates arranged at equal intervals are arranged in the cylinder. When the fluid flows through the mixing cylinder, the mixing impeller rotates under the pushing of the fluid to actively stir the flash rust preventing agent and the main fluid, and the baffle plate further changes the flow direction of the fluid to form a turbulent flow effect, so that the mixing uniformity is greatly improved.

Description

TECHNICAL FIELD

[0001] The application is a Venturi tube anti-flash rust agent filling mechanism, which belongs to the field of anti-flash rust agent filling. BACKGROUND

[0002] In the fields of metal processing, paint spraying, industrial cooling water circulation, etc., the metal surface is extremely prone to "flash rust" phenomenon in a short time due to contact with air, moisture or corrosive medium, resulting in product quality decline and equipment service life shortening. To solve this problem, the industry often needs to quantitatively add anti-flash rust agent to the fluid (such as paint, coolant, cleaning fluid, etc.) flowing through the pipeline. The filling method of anti-flash rust agent is mainly divided into two types: power-driven type and passive flow type. The power-driven type can achieve precise control, but it needs to additionally configure motor, pump body and other equipment, which increases system energy consumption and equipment cost, and the pipeline connection is complex and difficult to maintain. The passive flow type mainly uses the negative pressure principle of the Venturi tube, and the suction force generated by the kinetic energy of the fluid itself can suck the anti-flash rust agent into the main fluid without external power. Therefore, it has the advantages of simple structure and low energy consumption, and is widely used.

[0003] However, the existing anti-flash rust agent filling mechanism based on the Venturi tube has poor mixing effect in actual use. After the anti-flash rust agent is sucked through the throat, the mixing with the main fluid mainly depends on the natural convection of the diffusion section, and lacks active mixing structure, which leads to uneven distribution of the agent, waste caused by excessive concentration in some areas, and insufficient concentration in some areas affecting the rust prevention effect. Therefore, it is necessary to design a Venturi tube anti-flash rust agent filling mechanism. SUMMARY

[0004] In view of the deficiencies of the prior art, the application aims to provide a Venturi tube anti-flash rust agent filling mechanism to solve the problems in the background art.

[0005] In order to achieve the above-mentioned purpose, the application is implemented by the following technical scheme: a Venturi tube anti-flash rust agent filling mechanism, comprising: a Venturi jet device, which is sequentially provided with a first inlet section, a first contraction section, a first throat and a first diffusion section from left to right inside, the first inlet section is cylindrical, and the first contraction section gradually contracts from the end of the first inlet section, the first throat is the smallest part of the pipe diameter, and the first diffusion section gradually expands from the end of the first throat; a blowdown pipe arranged at the bottom of the first diffusion section; a Venturi flowmeter threadedly connected with the output end of the Venturi jet device; a liquid filling port opened in the center of the top end of the first throat; a liquid guide hose connected with the liquid filling port; The barrel is provided with a discharge port at one side bottom, a flow control valve is installed at the discharge port, and the output end of the flow control valve is threadedly connected with the other end of the liquid guide hose. The mixing mechanism is installed at the connection between the Venturi flow meter and the Venturi jet.

[0006] Further, the input end of the Venturi jet is provided with a first threaded part, the output end of the Venturi jet is integrally connected with a baffle, the end of the baffle away from the Venturi jet is integrally provided with a second threaded part, the inner diameter of the baffle is the same as that of the first diffusion section, and the inner diameter of the second threaded part is larger than that of the first diffusion section.

[0007] Further, the end of the Venturi flow meter close to the Venturi jet is provided with a threaded sleeve threadedly connected with the second threaded part, and the end of the Venturi flow meter away from the Venturi jet is integrally connected with a third threaded part, the inner side of the threaded sleeve is provided with an inner liner tube with an outer diameter matching the inner diameter of the second threaded part, and the inner diameter of the inner liner tube is the same as that of the first diffusion section.

[0008] Further, the inside of the Venturi flow meter is sequentially provided with a second inlet section, a second contraction section, a second throat and a second diffusion section from left to right, and the top center of the second throat and the second diffusion section are both communicated with a connecting branch pipe, and the flow meter is connected between the two connecting branch pipes.

[0009] Further, the mixing mechanism comprises a mixing barrel, a limiting assembly, a cleaning scraper, a spiral guide wheel, a mixing impeller and a rotating rod, the limiting assemblies are symmetrically arranged at the central positions of the two sides of the outer wall of the mixing barrel, the end of the mixing barrel close to the first throat is provided with a filter screen, the central position of the filter screen is penetrated through to be provided with the rotating rod, the rotating rod is arranged along the axial direction of the Venturi jet, the rotating rod is rotatably connected with the filter screen, the mixing impeller is installed on the rotating rod inside the mixing barrel, the spiral guide wheel is installed on the rotating rod outside the mixing barrel, the cleaning scraper is installed on the rotating rod between the mixing impeller and the filter screen, and the cleaning scraper is in close contact with the filter screen.

[0010] Further, the inner diameter of the mixing barrel matches the inner diameter of the first diffusion section, and the inner side wall of the mixing barrel is provided with multiple baffle plates at equal intervals.

[0011] Further, the top of the liquid adding port is integrally connected with a threaded connector, and the inside of the liquid adding port is provided with a one-way valve, and the liquid guide hose is connected with the threaded connector through a sealing threaded sleeve.

[0012] Further, the limiting assembly comprises a limiting seat, an opening, a limiting block and a return spring, the limiting seat is connected with the outer sidewall of the mixing cylinder, the inside of the limiting seat is slidably connected with the limiting block, the return spring is connected between the limiting block and the sidewall of the mixing cylinder, an opening is formed on the side of the limiting seat away from the center of the mixing cylinder, the end of the limiting block penetrates through the opening, and the end of the limiting block close to the Venturi flowmeter is provided with a hand pinch plate extending out of the limiting seat.

[0013] Further, the top of the blowdown pipe is in communication with the inside of the Venturi jet, and a on-off valve is installed on the blowdown pipe.

[0014] Further, an annular avoiding groove is formed on the end of the inner lining tube close to the Venturi jet, the shape and position of the annular avoiding groove correspond to those of the hand pinch plate, grooves are formed on the upper and lower ends of the inner wall of the baffle, the shape of the grooves is matched with that of the limiting seat, and a clamping groove is arranged in the groove corresponding to the position of the limiting block.

[0015] The beneficial effects of the present application are as follows: 1. The independent mixing mechanism is arranged, the mixing cylinder is integrated at the connection between the Venturi jet and the Venturi flowmeter, the mixing cylinder is provided with not only a mixing impeller but also multiple baffle plates arranged at equal intervals, when the fluid flows through the mixing cylinder, the mixing impeller rotates under the driving of the fluid to actively stir the anti-rust agent and the main fluid, and the baffle plates further change the flow direction of the fluid to form a turbulent effect, so that the mixing uniformity is greatly improved.

[0016] 2. The inlet end of the mixing mechanism is provided with a filter screen, which can effectively filter the small particles and impurities in the anti-rust agent to reduce the subsequent risk of blockage, the bottom of the diffusion section of the Venturi jet is provided with a blowdown pipe, when the filter screen is dirty due to the accumulation of a large amount of impurities after long-term use, without disassembling complex components, only by periodically opening the on-off valve on the blowdown pipe, the impurities accumulated near the filter screen can be discharged through the blowdown pipe by the pressure of the fluid, at the same time, the inside of the filter screen is provided with a cleaning scraper plate close to the surface thereof, when the rotating rod is driven to rotate with the fluid, the cleaning scraper plate can synchronously clean the filter screen in real time to prevent the impurities from adhering and accumulating, in addition, the mixing mechanism is quickly disassembled and assembled with the Venturi jet through the limiting assembly, the hand pinch plate of the limiting block can be pinched to release the locking, so that the filter screen and the mixing components can be conveniently taken out for deep cleaning or replacement. BRIEF DESCRIPTION OF DRAWINGS

[0017] Other characteristics, objects and advantages of the present application will become more apparent from the following detailed description of non-restrictive embodiments, made with reference to the accompanying drawings: Figure 1 It is an appearance structure schematic view of the Venturi tube anti-rust agent filling mechanism; Figure 2It is a cut structure schematic view of a Venturi tube anti-flash rust agent filling mechanism of the present application; Figure 3 It is a mixing mechanism structure schematic view of a Venturi tube anti-flash rust agent filling mechanism of the present application; Figure 4 It is a cut structure schematic view of a Venturi jet device of a Venturi tube anti-flash rust agent filling mechanism of the present application; Figure 5 It is a cut structure schematic view of a Venturi flowmeter of a Venturi tube anti-flash rust agent filling mechanism of the present application; Figure 6 It is a spiral guide wheel structure schematic view of a Venturi tube anti-flash rust agent filling mechanism of the present application; Figure 7 It is a mixing cylinder structure schematic view of a Venturi tube anti-flash rust agent filling mechanism of the present application; Figure 8 It is a cut structure schematic view of a Venturi tube anti-flash rust agent filling mechanism of the present application Figure 4 It is an enlarged structure schematic view of A in the present application In the figure: 1, Venturi jet device; 101, first threaded part; 102, baffle; 103, second threaded part; 104, groove; 105, clamping groove; 2, blowdown pipe; 201, on-off valve; 3, Venturi flowmeter; 301, threaded pipe sleeve; 302, inner lining pipe; 303, annular avoidance groove; 304, third threaded part; 305, connecting branch pipe; 4, flowmeter; 5, liquid guide hose; 501, sealing threaded sleeve; 6, flow control valve; 7, barrel; 8, liquid filling port; 801, threaded connector; 802, one-way valve; 9, mixing mechanism; 10, mixing cylinder; 1001, filter screen; 1002, baffle plate; 11, limiting assembly; 1101, limiting seat; 1102, opening; 1103, limiting block; 1104, return spring; 12, cleaning scraper; 13, spiral guide wheel; 14, mixing impeller; 15, rotating rod. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0019] Please refer to Figures 1 to 8The application provides a technical scheme: a Venturi tube anti-flash rust agent filling mechanism, which comprises a Venturi jet device 1, the inside of the Venturi jet device 1 is sequentially provided with a first inlet section, a first contraction section, a first throat and a first diffusion section from left to right, the first inlet section is cylindrical, the first contraction section is gradually contracted from the end of the first inlet section, the first throat is the place with the smallest pipe diameter, and the first diffusion section is gradually expanded from the end of the first throat, a blowdown pipe 2 is arranged at the bottom of the first diffusion section, a Venturi flowmeter 3 is threadedly connected with the output end of the Venturi jet device 1, a liquid filling opening 8 is arranged at the center of the top end of the first throat, a liquid guide hose 5 is connected with the liquid filling opening 8, a discharge port is arranged at the bottom of one side of a material cylinder 7, a flow control valve 6 is arranged at the discharge port, the output end of the flow control valve 6 is threadedly connected with the other end of the liquid guide hose 5, a mixing mechanism 9 is arranged at the connection position of the Venturi flowmeter 3 and the Venturi jet device 1, the sectional structure of the Venturi jet device 1 meets the fluid dynamics principle, the first contraction section and the first throat can effectively generate negative pressure, the negative pressure is the core power for sucking the anti-flash rust agent, the local disturbance of the mixing mechanism 9 does not affect the formation of the negative pressure of the first throat, so that the suction speed of the anti-flash rust agent is not disturbed, the inner diameter of the first inlet section is larger than that of the first diffusion section, so that the flow speed of the main fluid is increased to a certain extent, the blowdown pipe 2 can timely discharge impurities to avoid blockage, the Venturi flowmeter 3 can monitor the flow in real time and is convenient for regulation and control, the liquid filling opening 8 is arranged at the center of the top end of the throat and is beneficial to the preliminary mixing of the anti-flash rust agent and the main fluid, the flow control valve 6 can accurately control the filling amount of the anti-flash rust agent, the mixing mechanism 9 can improve the mixing effect, the overall structure is compact, and the cooperation work efficiency is high.

[0020] Please refer to Figure 2 The input end of the Venturi jet device 1 is provided with a first threaded part 101, the output end of the Venturi jet device 1 is integrally connected with a baffle 102, the end, away from the Venturi jet device 1, of the baffle 102 is integrally provided with a second threaded part 103, the inner diameter of the baffle 102 is the same as that of the first diffusion section, the inner diameter of the second threaded part 103 is larger than that of the first diffusion section, the first threaded part 101 facilitates the connection of the Venturi jet device 1 with an external pipeline, the second threaded part 103 is convenient for being connected with the Venturi flowmeter 3, and the design of the inner diameters can provide mounting space for the connecting components and ensure smooth fluid flow.

[0021] Please refer to Figure 2, the Venturi flowmeter 3 is provided with a threaded sleeve 301 at one end close to the Venturi jet 1, which is screwed with the second threaded part 103, and the other end of the Venturi flowmeter 3 is integrally connected with a third threaded part 304, the inner side of the threaded sleeve 301 is provided with an inner liner 302 with an outer diameter matching the inner diameter of the second threaded part 103, and the inner diameter of the inner liner 302 is the same as that of the first diffusion section, the threaded sleeve 301 cooperates with the second threaded part 103 to tightly connect the Venturi flowmeter 3 with the Venturi jet 1, and the sealing performance is good; the third threaded part 304 facilitates the connection of the Venturi flowmeter 3 with the subsequent pipeline, and enhances the adaptability of the mechanism; the inner liner 302 can ensure that the fluid has no obvious resistance at the connection, ensuring the accuracy of flow monitoring, while avoiding fluid leakage.

[0022] Please refer to Figure 1 and Figure 5 , the Venturi flowmeter 3 is provided with a threaded sleeve 301 at one end close to the Venturi jet 1, which is screwed with the second threaded part 103, and the other end of the Venturi flowmeter 3 is integrally connected with a third threaded part 304, the inner side of the threaded sleeve 301 is provided with an inner liner 302 with an outer diameter matching the inner diameter of the second threaded part 103, and the inner diameter of the inner liner 302 is the same as that of the first diffusion section, the threaded sleeve 301 cooperates with the second threaded part 103 to tightly connect the Venturi flowmeter 3 with the Venturi jet 1, and the sealing performance is good; the third threaded part 304 facilitates the connection of the Venturi flowmeter 3 with the subsequent pipeline, and enhances the adaptability of the mechanism; the inner liner 302 can ensure that the fluid has no obvious resistance at the connection, ensuring the accuracy of flow monitoring, while avoiding fluid leakage.

[0023] Please refer to Figure 2 , Figure 3 and Figure 6 , the mixing mechanism 9 includes a mixing cylinder 10, a limiting assembly 11, a cleaning scraper 12, a spiral guide wheel 13, a mixing impeller 14 and a rotating rod 15, the limiting assembly 11 is symmetrically arranged at the central position of the outer wall of the mixing cylinder 10, and the mixing cylinder 10 is provided with a filter screen 1001 at one end close to the first throat, the rotating rod 15 is penetratingly arranged at the central position of the filter screen 1001, and the rotating rod 15 is arranged along the axial direction of the Venturi jet 1, the rotating rod 15 is rotatably connected with the filter screen 1001, the mixing impeller 14 is installed on the rotating rod 15 inside the mixing cylinder 10, the spiral guide wheel 13 is installed on the rotating rod 15 outside the mixing cylinder 10, the cleaning scraper 12 is installed on the rotating rod 15 between the mixing impeller 14 and the filter screen 1001, and the cleaning scraper 12 is in close contact with the filter screen 1001, the limiting assembly 11 can firmly install the mixing mechanism 9, and is convenient for disassembly and maintenance; the filter screen 1001 can filter impurities to prevent blockage; the spiral guide wheel 13 drives the rotating rod 15 to rotate under the action of fluid, and then the mixing impeller 14 rotates, enhancing the mixing effect of the anti-flash rust agent and the main fluid; the cleaning scraper 12 can clean the impurities on the filter screen 1001 in real time, ensuring the smoothness of the filter screen 1001 without frequent disassembly and cleaning.

[0024] Please refer toFigure 2 And Figure 7 The inner diameter of the mixing barrel 10 matches the inner diameter of the first diffusion section, and the inner side wall of the mixing barrel 10 is provided with multiple baffles 1002 at equal intervals, which can change the flow direction of the fluid and increase the turbulence degree of the fluid, thereby further improving the mixing uniformity of the anti-flash rust agent and the main fluid. The inner diameter of the mixing barrel 10 is consistent with the inner diameter of the first diffusion section and the second inlet section, and the flow cross section does not change when the fluid flows through the mixing barrel 10, thereby avoiding the increase of local resistance and reducing the influence on the flow rate of the main fluid.

[0025] Please refer to Figure 1 The top of the liquid inlet 8 is integrally connected with a threaded connector 801, and a one-way valve 802 is arranged in the liquid inlet 8. The liquid guide hose 5 is connected with the threaded connector 801 through a sealing threaded sleeve 501. The threaded connector 801 cooperates with the sealing threaded sleeve 501 to tightly connect the liquid guide hose 5 with the liquid inlet 8, so that the sealing performance is good and the anti-flash rust agent is prevented from leaking. The one-way valve 802 can prevent the main fluid from flowing reversely into the liquid guide hose 5 and the barrel 7, thereby ensuring the stability and safety of the anti-flash rust agent filling.

[0026] Please refer to Figure 3 And Figure 7 The limiting assembly 11 includes a limiting seat 1101, an opening 1102, a limiting block 1103 and a return spring 1104. The limiting seat 1101 is connected with the outer side wall of the mixing barrel 10, and the limiting block 1103 is slidably connected in the limiting seat 1101. The return spring 1104 is connected between the limiting block 1103 and the side wall of the mixing barrel 10. An opening 1102 is formed in the side of the limiting seat 1101 away from the center of the mixing barrel 10, and the end of the limiting block 1103 penetrates through the opening 1102. A hand grip plate extending out of the limiting seat 1101 is arranged on the side of the end of the limiting block 1103 close to the return spring 1104. The limiting seat 1101 provides a mounting space for the limiting block 1103 and the return spring 1104. The limiting block 1103 extends out of the opening 1102 under the action of the return spring 1104 and is clamped into the clamping groove 105, thereby fixing the mixing mechanism 9. The hand grip plate facilitates the operator to manually release the limiting and facilitates the disassembly and assembly of the mixing mechanism 9, thereby improving the maintenance convenience.

[0027] Please refer to Figure 1 The top of the blow-off pipe 2 is in communication with the inside of the Venturi jet 1, and a shut-off valve 201 is arranged on the blow-off pipe 2. The blow-off pipe 2 is in communication with the inside of the Venturi jet 1, thereby effectively discharging the internal impurities. The shut-off valve 201 can control the opening and closing of blow-off, thereby facilitating the operator to regularly blow off according to the needs and avoiding the influence of impurity accumulation on the operation of the mechanism.

[0028] Please refer to Figure 4 , Figure 5 And Figure 8The annular avoiding groove 303 is arranged at one end of the inner lining pipe 302 close to the Venturi jet device 1, and the shape and position of the annular avoiding groove 303 correspond to those of the hand pinch plate; the upper and lower ends of the inner wall of the baffle 102 are both provided with the recess 104 which is adapted to the shape of the limiting seat 1101; and the recess 104 is provided with the clamping groove 105 which is adapted to the shape of the limiting block 1103 at the position corresponding to the limiting block 1103; the annular avoiding groove 303 can provide the hand pinch plate with a moving space, so that the inner lining pipe 302 does not interfere with the hand pinch plate during installation; the recess 104 facilitates the installation and positioning of the limiting seat 1101; the clamping groove 105 cooperates with the limiting block 1103, so that the mixing mechanism 9 can be firmly fixed on the baffle 102, and the stability of the mixing mechanism 9 during work is ensured.

[0029] Although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A venturi tube anti-flash rust agent dispensing mechanism, characterized in that, include: The Venturi jet (1) is arranged from left to right as a first inlet section, a first contraction section, a first throat and a first diffuser section. The first inlet section is cylindrical and the first contraction section gradually contracts from the end of the first inlet section. The first throat is the smallest diameter section and the first diffuser section gradually expands from the end of the first throat. The sewage pipe (2) is located at the bottom of the first diffusion section; The Venturi flow meter (3) is threadedly connected to the output end of the Venturi jet (1); The liquid inlet (8) is located at the center of the top of the first throat. A liquid delivery hose (5) is connected to the liquid inlet (8); The material cylinder (7) has a discharge port at the bottom of one side, and a flow control valve (6) is installed at the discharge port. The output end of the flow control valve (6) is threadedly connected to the other end of the liquid guiding hose (5). The mixing mechanism (9) is installed at the connection between the Venturi flow meter (3) and the Venturi jet (1).

2. The Venturi tube anti-flash rust agent dispensing mechanism according to claim 1, characterized in that: The input end of the Venturi jet (1) is provided with a first threaded portion (101), and the output end of the Venturi jet (1) is integrally connected with a baffle (102). The end of the baffle (102) away from the Venturi jet (1) is integrally provided with a second threaded portion (103). The inner diameter of the baffle (102) is the same as the inner diameter of the first diffusion section, and the inner diameter of the second threaded portion (103) is larger than the inner diameter of the first diffusion section.

3. The Venturi tube anti-flash rust agent dispensing mechanism according to claim 2, characterized in that: The Venturi flowmeter (3) is provided with a threaded sleeve (301) that is threaded to the second threaded part (103) at one end near the Venturi jet (1), and the Venturi flowmeter (3) is integrally connected to the third threaded part (304) at the other end away from the Venturi jet (1). The inner side of the threaded sleeve (301) is provided with an inner liner (302) whose outer diameter matches the inner diameter of the second threaded part (103), and the inner diameter of the inner liner (302) is the same as the inner diameter of the first diffuser section.

4. The Venturi tube anti-flash rust agent dispensing mechanism according to claim 1, characterized in that: The Venturi flow meter (3) is arranged from left to right as a second inlet section, a second constriction section, a second throat and a second diffuser section, and the top center of the second throat and the second diffuser section are connected to a connecting branch pipe (305), and a flow meter (4) is connected between the two connecting branch pipes (305).

5. The Venturi tube anti-flash rust agent dispensing mechanism according to claim 3, characterized in that: The mixing mechanism (9) includes a mixing cylinder (10), a limiting component (11), a cleaning scraper (12), a spiral guide wheel (13), a mixing impeller (14), and a rotating rod (15). The limiting components (11) are symmetrically arranged at the center of both sides of the outer wall of the mixing cylinder (10), and a filter screen (1001) is provided at one end of the mixing cylinder (10) near the first throat. The rotating rod (15) is provided through the center of the filter screen (1001), and the rotating rod (15) is... The rotating rod (15) is rotatably connected to the filter screen (1001) along the axial direction of the Venturi jet (1). A mixing impeller (14) is installed on the rotating rod (15) inside the mixing cylinder (10), and a spiral guide wheel (13) is installed on the rotating rod (15) outside the mixing cylinder (10). A cleaning scraper (12) is installed on the rotating rod (15) between the mixing impeller (14) and the filter screen (1001), and the cleaning scraper (12) is in close contact with the filter screen (1001).

6. The Venturi tube anti-flash rust agent dispensing mechanism according to claim 5, characterized in that: The inner diameter of the mixing cylinder (10) matches the inner diameter of the first diffusion section, and multiple baffles (1002) are provided at equal intervals on the inner sidewall of the mixing cylinder (10).

7. The Venturi tube anti-flash rust agent dispensing mechanism according to claim 1, characterized in that: The top of the liquid inlet (8) is integrally connected with a threaded connector (801), and a one-way valve (802) is provided inside the liquid inlet (8). The liquid guiding hose (5) is connected to the threaded connector (801) through a sealing threaded sleeve (501).

8. The Venturi tube anti-flash rust agent dispensing mechanism according to claim 5, characterized in that: The limiting assembly (11) includes a limiting seat (1101), an opening (1102), a limiting block (1103), and a return spring (1104). The limiting seat (1101) is connected to the outer wall of the mixing cylinder (10), and the limiting block (1103) is slidably connected inside the limiting seat (1101). The limit block (1103) is connected to the side wall of the mixing cylinder (10) by a return spring (1104). The limiting seat (1101) has an opening (1102) on the side away from the center of the mixing cylinder (10). The end of the limiting block (1103) passes through the opening (1102), and the end of the limiting block (1103) near the Venturi flow meter (3) and near the return spring (1104) is provided with a hand gripper that extends out of the limiting seat (1101).

9. The Venturi tube anti-flash rust agent dispensing mechanism according to claim 1, characterized in that: The top of the drain pipe (2) is connected to the inside of the Venturi jet (1), and an on / off valve (201) is installed on the drain pipe (2).

10. A venturi tube anti-flash rust agent dispensing mechanism according to claim 8, characterized in that: The inner liner tube (302) has an annular clearance groove (303) at one end near the Venturi jet (1), and the annular clearance groove (303) corresponds to the shape and position of the hand-pinching plate. The upper and lower ends of the inner wall of the baffle (102) are provided with grooves (104) whose shape matches the limiting seat (1101), and the grooves (104) are provided with slots (105) whose shape matches the limiting block (1103) at the position corresponding to the limiting block (1103).

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