Filtering device for reinforcing steel bar surface treatment

Abstract

The utility model relates to the technical field of reinforcing steel bar surface treatment, in particular to a filtering device for reinforcing steel bar surface treatment, which is used for separating and filtering waste gas of a reinforcing steel bar spraying device. The separation module is arranged in the working cavity and is connected with the steel bar spraying device through an air inlet pipe; the conveying module is arranged at the top of the main body and is used for outputting the purified gas; the refrigeration module communicates with the working cavity and is used for conveying cold air into the working cavity; and the recovery module is located at the bottom of the main body and used for recovering liquid separated from the working cavity. According to the filtering device for reinforcing steel bar surface treatment, cold air is conveyed to the working cavity through the refrigeration module, so that the temperature difference is generated between the working cavity and the separation module and waste gas, water vapor in the waste gas is forced to be condensed, the separation and filtering effects are enhanced, and spraying liquid particles in the waste gas are prevented from being adhered and solidified; the service life and the filtering treatment effect of the filtering device for reinforcing steel bar surface treatment are effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of reinforcing steel bar surface treatment, particularly relates to a filter device for reinforcing steel bar surface treatment. BACKGROUND

[0002] The reinforcing steel bar is very widely used in the building, due to the complexity of different working conditions and environment, so the reinforcing steel bar may need to be stored for a long time, so before the reinforcing steel bar is used, the surface is mostly treated by coating spraying, so that the rust prevention and other functions are obtained.

[0003] And in the traditional spraying equipment, the manual feeding spraying mode is mostly adopted, which is not only time-consuming and laborious, but also the coating mostly contains organic solvents, so direct spraying will cause the solvent to escape into the surrounding environment, causing pollution. In large-scale projects, automatic equipment is currently used for spraying, and only the exhaust gas is simply adsorbed and then discharged.

[0004] But because the solution particles generated when the reinforcing steel bar is sprayed are small, they are easy to enter the filter device together with the exhaust gas, the solution particles adhere to the surface of the filter device, and after solidification, the filter device is blocked, the adhered part of the filter device cannot fully absorb harmful components, the unadhered part is overloaded, resulting in low overall filtration efficiency and poor treatment effect. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a filter device for reinforcing steel bar surface treatment, which solves the problems of low filtration efficiency and poor treatment effect of the existing filter device.

[0006] In order to solve the above technical problems, the utility model adopts the technical scheme that a filter device for reinforcing steel bar surface treatment is used to separate and filter the exhaust gas of a reinforcing steel bar spraying device, which comprises:

[0007] The main body has a closed working cavity;

[0008] The separation module is arranged in the working cavity and connected with the reinforcing steel bar spraying device through the gas inlet pipe;

[0009] The conveying module is arranged at the top of the main body and used to output the purified gas;

[0010] The refrigeration module is communicated with the working cavity and used to convey cold air into the working cavity; the refrigeration module reduces the temperature of the separation module, and the moisture in the exhaust gas conveyed by the reinforcing steel bar spraying device is condensed to form a liquid film for adsorption after contacting with the separation module;

[0011] The recovery module is located at the bottom of the main body and used to recover the liquid separated from the working cavity;

[0012] The separation module comprises a cyclone separation mechanism and a filtering mechanism, the cyclone separation mechanism is communicated with the air inlet pipe, and the waste gas conveyed by the reinforcing steel bar spraying device is discharged after being treated by the cyclone separation mechanism and the filtering mechanism.

[0013] In an embodiment, the refrigeration module comprises an air supply pipeline, a one-way valve and a temperature sensor, the air supply pipeline is communicated with the working cavity through the one-way valve, and the temperature sensor is arranged in the working cavity.

[0014] In an embodiment, the cyclone separation mechanism comprises a conical shell and a central pipe, the diameter of the conical shell gradually increases from the bottom to the top, the top side of the conical shell is provided with an air inlet, and the air inlet is tangentially connected with the air inlet pipe; the bottom of the conical shell is provided with a liquid outlet.

[0015] The central pipe is connected with the center of the top of the conical shell, and the central pipe extends from the outside of the conical shell to the inside of the conical shell.

[0016] In an embodiment, the inner wall of the conical shell is provided with a flow guide spiral around the central pipe.

[0017] In an embodiment, the filtering mechanism comprises a first filter element, and the first filter element is arranged at the top of the working cavity; the first filter element has a filtering wall, the filtering wall forms a central flow channel around an axis, and the central flow channel is communicated with the conveying module.

[0018] In an embodiment, a buffer cavity is arranged above the working cavity, the conveying module is arranged at the top of the buffer cavity, and the central flow channel is communicated with the buffer cavity.

[0019] In an embodiment, the buffer cavity is filled with an adsorption layer, and in the vertical direction, the projection area of the first filter element is in the projection area of the adsorption layer.

[0020] In an embodiment, one side of the main body is provided with a sealing door, and the sealing door is used for opening or closing the working cavity and the buffer cavity.

[0021] In an embodiment, the bottom of the main body is provided with a flow converging piece, and the flow converging piece extends from the bottom of the working cavity to a side away from the working cavity.

[0022] In an embodiment, the recovery module comprises a recovery trailer, the bottom of the flow converging piece extends horizontally to the periphery to form a first sealing wall, the recovery trailer is provided with a second sealing wall corresponding to the first sealing wall, and the first sealing wall and the second sealing wall abut.

[0023] The steel surface treatment filtering device has the advantages that the refrigeration module is used to convey cold air to the working cavity, so that the temperature difference between the working cavity and the separation module and the waste gas is generated, the water vapor in the waste gas is condensed, the separation and filtering effects are enhanced, the spraying liquid particles in the waste gas are prevented from adhering and solidifying, and the service life and the filtering treatment effect of the steel surface treatment filtering device are effectively improved. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a front view of an embodiment of the present utility model;

[0026] Figure 2 This is a side view of an embodiment of the present invention;

[0027] Figure 3 This is a top view of an embodiment of the present invention;

[0028] Figure 4 for Figure 2 Cross-sectional view at point AA;

[0029] Figure 5 for Figure 3 Cross-sectional view at BB.

[0030] Label Explanation:

[0031] 1. Main body; 11. Working cavity; 12. Air inlet pipe; 13. Buffer cavity; 131. Adsorption layer; 14. Sealed door; 15. Manifold; 2. Separation module; 21. Cyclone separation mechanism; 211. Conical shell; 212. Central tube; 213. Guide spiral; 22. Filtration mechanism; 221. First filter element; 221a. Filter wall; 222. Central flow channel; 3. Conveying module; 4. Cooling module; 41. Air supply duct; 42. One-way valve; 43. Temperature sensor; 5. Recovery module; 51. Recovery trailer. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] In the description of this utility model, it should be noted that the terminology... " center ” Vertical ” Horizontal” "upper ” "lower ” "front ” "rear ” "left ” "right ” "vertical ” "horizontal ” "top ” "bottom ” "inner ” "outer ” The orientation or positional relationship indicated by the terms " first ” "second ” are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0034] Please refer to Figures 1 to 5 A filter device for reinforcing steel surface treatment is used for separating and filtering waste gas of a reinforcing steel spraying device, comprising a main body 1, a separation module 2, a conveying module 3, a refrigeration module 4 and a recovery module 5.

[0035] The main body 1 has a closed working cavity 11; the separation module 2 is arranged in the working cavity 11 and connected with the reinforcing steel spraying device through an air inlet pipe 12; the conveying module 3 is arranged at the top of the main body 1 and used for outputting the purified gas; the refrigeration module 4 is communicated with the working cavity 11 and used for conveying cold air into the working cavity 11; the refrigeration module 4 reduces the temperature of the separation module 2, and the moisture in the waste gas is condensed to form a liquid film for adsorption after contacting with the separation module 2; the recovery module 5 is arranged at the bottom of the main body 1 and used for recovering the liquid separated from the working cavity 11.

[0036] Specifically, the main body 1 adopts a cabinet structure as a whole, the working cavity 11 is enclosed in the main body 1, and the whole is communicated through the gas inlet pipe 12 and the conveying module 3, the conveying module 3 comprises a fan, and the gas in the working cavity 11 is exhausted. Under the action of the conveying module 3, the waste gas flows along the separation module 2, is separated and adsorbed in the separation module 2, and is then discharged by the conveying module 3. The recovery module 5 collects the liquid separated by the separation module 2. The refrigeration module 4 is connected with external refrigeration equipment, and cold air is conveyed into the working cavity 11. After the cold air is input, the temperature of the working cavity 11 and the internal structure is reduced, and a temperature difference is formed with the waste gas. The temperature difference causes the water vapor in the waste gas to condense after contacting the separation module 2, and liquid droplets are formed in the separation module 2. The liquid droplets adsorb the spraying liquid particles in the waste gas and then flow into the recovery module 5, thereby effectively enhancing the separation effect. Moreover, under the condition that the waste gas continuously flows in, the water vapor in the waste gas condenses to form a liquid film on the surface of the structure in the working cavity 11. The liquid film can adsorb inorganic components and possibly existing water-soluble components in the waste gas, and can also prevent the spraying liquid particles in the waste gas from adhering and solidifying. At the same time, the refrigeration module 4 can adjust the pressure difference between the inside and outside of the working cavity 11 after sending air, so that the suction force generated by the conveying module 3 is not too large, thereby preventing a large amount of spraying liquid from entering the working cavity 11 and affecting the spraying effect. Moreover, after the temperature in the working cavity 11 is reduced, the possibility that the flammable components in the spraying waste gas are ignited is reduced, thereby effectively improving the safety.

[0037] The separation module 2 comprises a cyclone separation mechanism 21 and a filtering mechanism 22. The waste gas conveyed by the steel bar spraying device is discharged after being treated by the cyclone separation mechanism 21 and the filtering mechanism 22. Specifically, the separation module 2 adopts two-stage treatment. The spraying liquid particles are pretreated by the cyclone separation mechanism 21, most of the spraying liquid particles are settled and recovered by mechanical action, the load of the filtering mechanism 22 is reduced, the spraying liquid particles are prevented from adhering to the surface of the filtering mechanism 22, the service life of the filtering mechanism 22 is prolonged, and the overall treatment efficiency is improved.

[0038] It can be understood that the filtering device for steel bar surface treatment provided by the utility model can convey cold air into the working cavity 11 through the refrigeration module 4, so that the temperature of the working cavity 11 and the separation module 2 has a temperature difference with the waste gas, the water vapor in the waste gas is condensed, the separation and filtering effects are strengthened, the liquid particles in the waste gas are prevented from adhering and solidifying, and the filtering treatment efficiency is effectively improved.

[0039] In an embodiment, the refrigeration module 4 comprises an air supply pipeline 41, a one-way valve 42 and a temperature sensor 43, the air supply pipeline 41 is communicated with the working cavity 11 through the one-way valve 42, and the temperature sensor 43 is arranged in the working cavity 11. Specifically, the air supply pipeline 41 is connected with an external refrigeration device to deliver cold air into the working cavity 11. The one-way valve 42 is arranged to avoid the exhaust gas flowing out of the air supply pipeline 41 and to avoid the exhaust gas leakage. The temperature sensor 43 is used to detect the temperature in the working cavity 11, which is convenient for the operator to adjust the cold air delivery amount and ensure the formation of temperature difference.

[0040] Preferably, the connection point of the air supply pipeline 41 and the working cavity 11 is arranged at a position below the filtering mechanism 22 in the working cavity 11. This arrangement enables the cold air delivered by the air supply pipeline 41 to fully exchange heat in the working cavity 11 and reduce the overall temperature. At the same time, the setting point is close to the filtering mechanism 22, so that the cold air first contacts the filtering mechanism 22, causing the temperature of the cyclone separation mechanism 21 to be slightly higher than that of the filtering mechanism 22, thereby enabling the exhaust gas to further condense in the filtering mechanism 22 and ensuring the formation of liquid film. Moreover, the setting point is not arranged too close to the top, thereby avoiding the problem of insufficient refrigeration effect caused by the cold air being sucked too fast by the delivery module 3.

[0041] In an embodiment, the cyclone separation mechanism 21 comprises a conical shell 211 and a central pipe 212. The diameter of the conical shell 211 gradually increases from the bottom to the top. The conical shell 211 is provided with an air inlet on the side of the top. The air inlet is tangentially connected with the air inlet pipe 12. The bottom of the conical shell 211 is provided with a liquid outlet. The central pipe 212 is connected with the center of the top of the conical shell 211. The central pipe 212 extends from the outside of the conical shell 211 to the inside of the conical shell 211. Specifically, the cyclone separation mechanism 21 uses centrifugal force to separate the exhaust gas. The air inlet enables the exhaust gas to enter the conical shell 211 along the tangent. Under the action of centrifugal force, the exhaust gas spirally flows downward around the central pipe 212 to the bottom of the conical shell 211, and then flows out of the conical shell 211 through the central pipe 212. During the spiral downward process of the exhaust gas, the large-diameter spraying liquid particles are thrown to the inner wall of the conical shell 211 and flow along the inner wall to the liquid outlet after collision. At the same time, due to the existence of temperature difference, part of the water vapor in the exhaust gas condenses, and part of the small-diameter spraying liquid particles that cannot be separated by centrifugal force are adsorbed by the condensed liquid drops and flow to the liquid outlet together. This arrangement can remove as much as possible the large-diameter spraying liquid particles and part of the small-diameter spraying liquid particles in the exhaust gas, effectively reduce the processing load of the subsequent filtering mechanism 22, and has good separation effect, convenient maintenance and can effectively reduce the cost.

[0042] Specifically, the central tube 212 extends from the top of the conical shell 211 to the middle and lower part of the conical shell 211, and is away from the bottom of the conical shell 211 to avoid the central tube 212 from extending too much and damaging the formation of the spiral airflow, thereby ensuring the separation effect. Preferably, the central tube 212 extends to the position of 2 / 3 to 3 / 4 from the top to the bottom of the conical shell 211.

[0043] In an embodiment, the inner wall of the conical shell 211 is provided with a flow guide spiral 213 around the central tube 212. After the flow guide spiral 213 is provided, the formation of the spiral airflow can be strengthened, and the contact area between the exhaust gas and the cyclone separation mechanism 21 can be increased, thereby increasing condensation and ensuring the separation effect. Preferably, the cyclone separation mechanism 21 is provided with multiple. Further increasing the overall contact area can enhance the separation effect.

[0044] In an embodiment, the filtering mechanism 22 includes a first filter core 221, which is arranged at the top of the working cavity 11. The first filter core 221 has a filter wall 221a, which forms a central flow channel 222 around the axis. The central flow channel 222 is in communication with the conveying module 3. Specifically, multiple first filter cores 221 are arranged, and the central flow channel 222 is in communication with the conveying module 3 through a pipeline from the top of the first filter core 221. The bottom of the first filter core 221 is sealed, so that the airflow in the working cavity 11 can only flow out through the path of the filter wall 221a and the central flow channel 222 to the conveying module 3. In this way, the outflowing gas can be guaranteed to be filtered, thereby ensuring the purification effect. Specifically, the first filter core 221 can use an industrial filter core, and activated carbon or other adsorption materials can be filled between the filter wall 221a and the central flow channel 222 to ensure the filtering effect. Those skilled in the art can select a suitable filter core according to the specific type of harmful components in the exhaust gas, without specific limitation.

[0045] In an embodiment, a buffer cavity 13 is arranged above the working cavity 11, and the conveying module 3 is arranged at the top of the buffer cavity 13. The central flow channel 222 is in communication with the buffer cavity 13. The buffer cavity 13 is arranged above the working cavity 11 and is in communication with the central flow channel 222. In this way, the conveying module 3 can be prevented from directly sucking the first filter core 221, which facilitates the adjustment of the conveying pressure by the operator and prevents the filtering mechanism 22 from being damaged due to excessive pressure, thereby ensuring the filtering effect.

[0046] In an embodiment, the buffer cavity 13 is filled with an adsorption layer 131, and the projection area of the first filter core 221 is within the projection area of the adsorption layer 131 in the vertical direction. The adsorption layer 131 is arranged in the buffer cavity 13, which can effectively prevent the activated carbon or other adsorption materials from being disabled after absorbing condensed water, and further adsorb the exhaust gas filtered by the filtering mechanism 22, thereby ensuring that the finally discharged gas meets the standard.

[0047] In an embodiment, the main body 1 is provided with airtight doors 14 for opening or closing the working cavity 11 and the buffer cavity 13. Specifically, the working cavity 11 and the buffer cavity 13 are each provided with an airtight door 14, so that the operator can independently open the working cavity 11 or the buffer cavity 13 as needed, facilitating the operator to maintain, replace the adsorption layer 131 or the filtering mechanism 22, and effectively improving the work efficiency.

[0048] In an embodiment, the main body 1 is provided with a flow collector 15 extending from the bottom of the working cavity 11 to a side away from the working cavity 11. The flow collector 15 is funnel-shaped as a whole and gradually converges to the center during the downward extension, so that the liquid discharged by the cyclone separation mechanism 21 and the condensed liquid drop are collected and then enter the recycling module 5, reducing the residual liquid and facilitating the operator to clean and maintain.

[0049] In an embodiment, the recycling module 5 includes a recycling trailer 51, the bottom of the flow collector 15 extends horizontally around the first sealing wall, the recycling trailer 51 is provided with a second sealing wall corresponding to the first sealing wall, and the first sealing wall and the second sealing wall abut. In this way, the sealing effect can be ensured to avoid liquid leakage. At the same time, the setting of the recycling trailer 51 enables the operator to quickly replace the recycling module 5, ensuring the efficiency of waste gas treatment.

[0050] Please refer to Figures 1 to 5 The embodiment of the utility model provides a filtering device for reinforcing steel bar surface treatment, which is used for separating and filtering waste gas of a reinforcing steel bar spraying device and comprises a main body 1, a separation module 2, a conveying module 3, a refrigeration module 4 and a recycling module 5.

[0051] The main body 1 has a closed working cavity 11; the separation module 2 is arranged in the working cavity 11 and connected with the reinforcing steel bar spraying device through an air inlet pipe 12; the conveying module 3 is arranged at the top of the main body 1 and used for outputting the purified gas; the refrigeration module 4 is communicated with the working cavity 11 and used for conveying cold air into the working cavity 11; and the recycling module 5 is located at the bottom of the main body 1 and used for recycling the liquid separated by the working cavity 11.

[0052] The main body 1 is a double-layer cabinet structure, the working cavity 11 is closed in the first layer main body 1, the buffer cavity 13 is arranged in the second layer cabinet, and the working cavity 11 is closed and communicated through the air inlet pipe 12 and the conveying module 3. The conveying module 3 comprises a fan and is used for exhausting air from the working cavity 11.

[0053] The separation module 2 comprises a cyclone separation mechanism 21 and a filtering mechanism 22. The cyclone separation mechanism 21 is communicated with the air inlet pipe 12, and the waste gas conveyed by the reinforcing steel bar spraying device is discharged after being treated by the cyclone separation mechanism 21 and the filtering mechanism 22.

[0054] The refrigeration module 4 comprises a supply air pipeline 41, a one-way valve 42 and a temperature sensor 43, the supply air pipeline 41 is communicated with the working cavity 11 through the one-way valve 42, and the temperature sensor 43 is arranged in the working cavity 11. The supply air pipeline 41 is connected with an external refrigeration device to deliver cold air into the working cavity 11. The connecting point of the supply air pipeline 41 and the working cavity 11 is arranged in the lower part of the filtering mechanism 22 in the working cavity 11.

[0055] The cyclone separation mechanism 21 comprises a conical shell 211 and a central pipe 212, the diameter of the conical shell 211 gradually increases from the bottom to the top, the top side of the conical shell 211 is provided with an air inlet, and the air inlet is tangentially connected with the air inlet pipe 12; the bottom of the conical shell 211 is provided with a liquid outlet; the central pipe 212 is connected with the center of the top of the conical shell 211, and the central pipe 212 extends from the outside of the conical shell 211 to the inside of the conical shell 211.

[0056] In the embodiment, the filtering mechanism 22 comprises a first filter element 221, and the first filter element 221 is arranged at the top of the working cavity 11; the first filter element 221 has a filtering wall 221a, the filtering wall 221a surrounds an axis to form a central flow channel 222, the delivery module 3 is arranged at the top of the buffer cavity 13, and the central flow channel 222 is communicated with the buffer cavity 13.

[0057] In the embodiment, the buffer cavity 13 is filled with an adsorption layer 131, and in the vertical direction, the projection area of the first filter element 221 is in the projection area of the adsorption layer 131.

[0058] In the embodiment, the main body 1 is provided with a flow converging piece 15 at the bottom, and the flow converging piece 15 extends from the bottom of the working cavity 11 to the side away from the working cavity 11. The recovery module 5 comprises a recovery trailer 51, the bottom of the flow converging piece 15 extends horizontally to the periphery and is provided with a first sealing wall, the recovery trailer 51 is provided with a second sealing wall corresponding to the first sealing wall, and the first sealing wall and the second sealing wall abut.

[0059] The working principle of the utility model is as follows: when in use, the operator starts the delivery module 3 and the refrigeration module 4, after the temperature in the working cavity 11 reaches a predetermined temperature, waste gas is connected, and the waste gas is separated and adsorbed along the path of the cyclone separation mechanism 21, the filtering mechanism 22, the adsorption layer 131 and the delivery module 3 and then discharged. The condensed liquid in the cyclone separation mechanism 21 and the working wall body is collected along the flow converging piece 15 and then enters the recovery trailer 51. The operator replaces the recovery trailer 51 when the stage treatment is completed.

[0060] Although the terms such as main body, working cavity, air inlet pipe, buffer cavity, adsorption layer, sealing door, flow converging member, separation module, cyclone separation mechanism, conical shell, central tube, flow guide spiral, filtering mechanism, first filter element, filtering wall, central flow channel, conveying module, refrigeration module, air supply pipeline, one-way valve, temperature sensor, recycling module, recycling trailer, etc. are used more frequently in the present application, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present application; any additional limitation is contrary to the spirit of the present application.

[0061] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A filter device for surface treatment of reinforcing bars, used to separate and filter exhaust gas from a reinforcing bar spraying device, characterized in that, include: The main body (1) has a sealed working cavity (11); The separation module (2) is set in the working cavity (11) and connected to the steel bar spraying device through the air inlet pipe (12); A delivery module (3) is disposed on the top of the main body (1) for outputting purified gas; The refrigeration module (4) is connected to the working cavity (11) and is used to deliver cold air into the working cavity (11); the refrigeration module (4) lowers the temperature of the separation module (2), and the moisture in the exhaust gas delivered by the steel bar spraying device condenses and forms an adsorption liquid film after contacting the separation module (2). The recovery module (5), located at the bottom of the main body (1), is used to recover the liquid separated from the working cavity (11); The separation module (2) includes a cyclone separation mechanism (21) and a filter mechanism (22). The cyclone separation mechanism (21) is connected to the air inlet pipe (12). The exhaust gas delivered by the steel bar spraying device is discharged after being processed by the cyclone separation mechanism (21) and the filter mechanism (22).

2. The filter device for steel bar surface treatment according to claim 1, characterized in that: The refrigeration module (4) includes an air supply duct (41), a one-way valve (42), and a temperature sensor (43). The air supply duct (41) is connected to the working cavity (11) through the one-way valve (42), and the temperature sensor (43) is located in the working cavity (11).

3. The filter device for steel bar surface treatment according to claim 1, characterized in that: The cyclone separator (21) includes a conical shell (211) and a central tube (212). The diameter of the conical shell (211) gradually increases from the bottom to the top. An air inlet is provided on the top side of the conical shell (211), and the air inlet is tangentially connected to the air inlet pipe (12). A liquid outlet is provided at the bottom of the conical shell (211). The central tube (212) is connected to the center of the top of the conical shell (211), and the central tube (212) extends from the outside of the conical shell (211) to the inside of the conical shell (211).

4. The filter device for steel bar surface treatment according to claim 3, characterized in that: The inner wall of the conical shell (211) is provided with a flow guide spiral (213) surrounding the central tube (212).

5. The filter device for steel bar surface treatment according to claim 1, characterized in that: The filtration mechanism (22) includes a first filter element (221), which is disposed at the top of the working cavity (11); the first filter element (221) has a filter wall (221a), which forms a central flow channel (222) around the axis, and the central flow channel (222) is connected to the conveying module (3).

6. The filter device for steel bar surface treatment according to claim 5, characterized in that: A buffer cavity (13) is provided above the working cavity (11), the conveying module (3) is located on the top of the buffer cavity (13), and the central flow channel (222) is connected to the buffer cavity (13).

7. The filter device for steel bar surface treatment according to claim 6, characterized in that: The buffer cavity (13) is filled with an adsorption layer (131), and in the vertical direction, the projection area of ​​the first filter element (221) is within the projection area of ​​the adsorption layer (131).

8. The filter device for steel bar surface treatment according to claim 6, characterized in that: The main body (1) is provided with a sealed door (14) on one side, which is used to open or close the working cavity (11) and the buffer cavity (13).

9. The filtering device for steel bar surface treatment according to claim 1, characterized in that: The main body (1) is provided with a manifold (15) at the bottom, and the manifold (15) extends from the bottom of the working cavity (11) to the side away from the working cavity (11).

10. The filter device for surface treatment of reinforcing bars according to claim 9, characterized in that: The recycling module (5) includes a recycling trailer (51). The bottom of the manifold (15) extends horizontally to all sides with a first sealing wall. The recycling trailer (51) is provided with a second sealing wall corresponding to the first sealing wall. The first sealing wall abuts against the second sealing wall.

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