Condenser for rolling oil recovery and rolling oil recovery device

Abstract

The present application relates to a condenser for rolling oil recovery and a rolling oil recovery device, the condenser for rolling oil recovery comprises a smoke exhaust pipe and an oil exhaust pipe. A smoke inlet and a smoke outlet are respectively provided at the axial ends of the smoke exhaust pipe, the smoke exhaust pipe is provided with a fin condenser, the inner wall of the smoke exhaust pipe is provided with an oil collecting groove, the oil collecting groove and the fin condenser are matched and arranged oppositely; the pipe wall of the oil exhaust pipe is respectively provided with an oil inlet and an oil outlet, one end of the oil exhaust pipe provided with the oil inlet is inserted into the oil collecting groove of the smoke exhaust pipe to communicate with the oil collecting groove, the oil outlet is located outside the smoke exhaust pipe, the oil exhaust pipe, the liquid inlet and the oil collecting groove are all located on the same side of the smoke exhaust pipe along its radial direction, and the liquid inlet and the liquid outlet are respectively located on opposite sides of the smoke exhaust pipe along its radial direction. The rolling oil recovery device comprises the aforementioned condenser for rolling oil recovery. The present application can condense and recover rolling oil in metal rolling smoke to reduce costs.

Description

Technical Field

[0001] The present application relates to the technical field of metal rolling, and in particular to a condenser for rolling oil recovery and a rolling oil recovery device. Background Art

[0002] Aluminum foil and other metals will generate a lot of deformation heat during the rolling process. In order to remove the heat and lubricate properly, rolling oil is usually added as a lubricating coolant. The rolling oil is partially atomized by the deformation heat during the rolling process, forming oil mist and fume of different particle sizes. In order to reduce the adverse effects of oil mist in the operating environment on the physical and mental health of workers and prevent fire hazards, fume exhaust hoods are usually installed in the metal rolling environment to absorb the oil mist and fume.

[0003] In order to reduce costs, rolling oil is usually recovered from the oily fume discharged from the exhaust hood. In addition to rolling oil, other soluble oil impurities such as lubricating oil and hydraulic oil are also sucked into the oily fume. These oil vapors and oil droplets are easy to condense. However, the existing oil mist recovery system usually directly absorbs and desorbs the oily fume transported from the exhaust hood. The later desorption requires more heat energy, and the cost of recovering rolling oil is high.

[0004] Therefore, how to reduce the cost of separating and collecting rolling oil from the oily fume extracted from the metal rolling exhaust hood has become an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In order to reduce the cost of separating and collecting rolling oil from oil-containing flue gas, the present application provides a condenser for rolling oil recovery and a rolling oil recovery device.

[0006] A condenser for rolling oil recovery provided in order to achieve the purpose of the utility model comprises:

[0007] Smoke exhaust ducts and oil exhaust ducts;

[0008] The smoke exhaust pipe is provided with a smoke inlet and a smoke outlet at two axial ends thereof, the smoke exhaust pipe is provided with a fin condenser, an oil collecting groove is provided on the inner wall of the smoke exhaust pipe, and the oil collecting groove matches and is arranged opposite to the fin condenser;

[0009] An oil inlet and an oil discharge port are respectively provided on the wall of the oil discharge pipe. One end of the oil discharge pipe provided with the oil inlet penetrates into the oil collecting groove of the smoke exhaust pipe to communicate with the oil collecting groove. The oil discharge port is located outside the smoke exhaust pipe. The liquid inlet and the liquid outlet of the fin condenser are respectively located on opposite sides of the smoke exhaust pipe along the radial direction thereof. The oil discharge pipe, the liquid inlet and the oil collecting groove are all located on the same side of the smoke exhaust pipe along the radial direction thereof.

[0010] According to another aspect of the present application, a rolling oil recovery device is provided, comprising:

[0011] A fume hood and a condenser for recovering the rolling oil;

[0012] The inlet of the fume hood is suitable for being arranged toward the rolling mill, and the fume hood is provided with an exhaust device to suck the oily fume in the metal rolling environment from the inlet of the fume hood and discharge it from the outlet of the fume hood;

[0013] One end of the smoke hood having an outlet is connected to one end of the smoke exhaust pipe having a smoke inlet, and the outlet of the smoke hood is communicated with the smoke inlet of the smoke exhaust pipe.

[0014] In the oily flue gas, part of the rolling oil condenses from gas to liquid at a high condensation temperature, and is easy to be condensed and recovered. It can be condensed and separated only by simple cooling. The condensation operation is simple and low-cost. Specifically: The present application is provided by setting up a smoke exhaust duct, and a fin condenser is provided in the smoke exhaust duct. The smoke exhaust duct receives the oily flue gas delivered by the smoke hood through the smoke inlet, and collects the rolling oil in the flue gas through the fin condenser, and discharges the condensed flue gas through the smoke outlet. An oil collecting groove is provided in the smoke exhaust duct to collect the condensed rolling oil, and the oil discharge duct is used to take out and collect the rolling oil so as to reuse the rolling oil. Compared with the existing recovery system which directly passes the oily fumes from the fume hood into the absorption tower and the vacuum distillation equipment, which consumes a large amount of absorbent and distillation energy and is relatively costly, the present application can significantly reduce the content of easily condensable oil and gas in the oily fumes at a low cost, reduce the unnecessary consumption of absorbent and vacuum distillation equipment energy, thereby reducing the overall cost of separating and collecting rolling oil from the oily fumes extracted from the metal rolling fume hood, reusing and recycling the rolling oil, and reducing the cost of metal rolling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A cross-sectional structural diagram showing a rolling oil recovery condenser according to an embodiment of the present application;

[0016] Figure 2 A side structural diagram showing a rolling oil recovery condenser according to an embodiment of the present application;

[0017] Figure 3 A schematic diagram showing the structure of a rolling oil recovery device according to an embodiment of the present application;

[0018] Figure 4 A schematic diagram showing the structure of a condenser for rolling oil recovery according to an embodiment of the present application;

[0019] Figure 5 A side structural diagram of a rolling oil recovery condenser according to an embodiment of the present application is shown.

[0020] Smoke exhaust pipe 100, smoke inlet pipe 110, second annular pipe 120, oil collecting groove 121, smoke outlet pipe 130, fin condenser 200, input shell 210, liquid inlet 211, first annular pipe 220, output shell 230, liquid outlet 231, vibrator 240, oil exhaust pipe 300, feed pipe 310, U-shaped pipe 320, discharge pipe 330, support seat 400, lifting ear 500, smoke hood 600, exhaust equipment 610, rolling mill 700. DETAILED DESCRIPTION

[0021] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0022] In addition, in order to better illustrate the present application, numerous specific details are provided in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods and means well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0023] According to one aspect of the present application, a condenser for rolling oil recovery is provided, including a smoke duct and an oil exhaust duct 300 .

[0024] The smoke exhaust pipe 100 is provided with a smoke inlet and a smoke outlet at both axial ends thereof, and the smoke exhaust pipe 100 is provided with a fin condenser 200, and the liquid inlet 211 and the liquid outlet 231 of the fin condenser 200 are respectively located at opposite sides of the smoke exhaust pipe 100 along the radial direction thereof;

[0025] An oil collecting groove 121 is provided on the inner wall of the smoke exhaust duct 100. The oil collecting groove 121 is located at one end of the smoke exhaust duct 100 along its radial direction, and the groove-shaped opening of the oil collecting groove 121 faces the axis of the smoke exhaust duct 100. The oil collecting groove 121 and the fin condenser 200 are matched and arranged relative to each other. The relative arrangement specifically means that the part of the smoke exhaust duct 100 where the fin condenser 200 is arranged is the condensation zone, and the oil collecting groove 121 is also located in the condensation zone to collect the condensed rolling oil in this area. Matching specifically means that along the axial direction of the smoke exhaust duct 100, the preset length of the groove-shaped opening of the oil collecting groove 121 is basically consistent with the preset length of the fin condenser 200, and preferably, the preset length of the groove-shaped opening of the oil collecting groove 121 is slightly larger.

[0026] An oil inlet and an oil discharge port are respectively provided on the wall of the oil discharge pipe 300. One end of the oil discharge pipe 300 provided with the oil inlet penetrates into the oil collecting groove 121 of the smoke exhaust pipe 100 to discharge the condensed oil in the oil collecting groove 121. The oil discharge port is located outside the smoke exhaust pipe 100. The oil discharge pipe 300, the liquid inlet 211 and the oil collecting groove 121 are all located on the same side of the smoke exhaust pipe 100 along its radial direction.

[0027] The present application sets a smoke exhaust pipe 100, and the smoke exhaust pipe 100 is provided with a fin condenser 200. The smoke exhaust pipe 100 receives the oily smoke delivered by the smoke hood 600 through the smoke inlet, collects the rolling oil in the smoke through the fin condenser 200, and discharges the smoke after condensation through the smoke outlet. An oil collecting groove 121 is set in the smoke exhaust pipe 100 to collect the condensed rolling oil, and the oil discharge pipe 300 is used to take out and collect the rolling oil for reuse. Compared with the existing recovery system that directly passes the oily smoke from the smoke hood into the absorption tower and the vacuum distillation equipment, consumes a large amount of absorbent and distillation energy, and has a high cost, the present application can significantly reduce the condensable oil and gas content in the oily smoke at a low cost, reduce the unnecessary consumption of absorbent and vacuum distillation equipment energy, thereby reducing the overall cost of separating and collecting rolling oil from the oily smoke extracted from the metal rolling smoke hood, reusing and recycling the rolling oil, and reducing the cost of metal rolling.

[0028] In addition, in order to ensure the health of the operators and to prevent fires, the wind force of the smoke hood 600 is generally relatively large. Therefore, the oily smoke input from the smoke inlet has a certain initial velocity. The present application sets a groove on the inner wall of the smoke exhaust pipe 100, below the gravity direction, and the condensate falls into the groove under the action of gravity and flows out along the oil exhaust pipe 300. Compared with some condensers that use a full cylindrical or other smooth inner wall for condensation, the present application can prevent the condensed rolling oil from being blown out of the smoke outlet by the wind to a certain extent, reduce unnecessary losses, and obtain more rolling oil.

[0029] It should be noted that the present application does not specifically limit the pipe shape, installation position, and connection method of the fin condenser 200 with the smoke exhaust pipe 100. As long as the fins of the fin condenser 200 can be used to increase the indirect contact area between the oily smoke and the condensed liquid inside the condenser tube, the condensation speed can be accelerated, and the condensation effect can be guaranteed. The fin condenser 200 can be a plurality of coaxially arranged annular pipes connected to each other, or a spirally coiled pipe. The spiral pipe can be sleeved on the spiral groove on the outer wall of the smoke exhaust pipe 100, or it can be sleeved inside the smoke exhaust pipe 100 and keep a distance from the inner wall. As long as the liquid inlet and outlet 231 of the spiral pipe passes through the smoke exhaust pipe 100, it can also be a plurality of parallel coaxially arranged cooling fins, and the smoke exhaust pipe 100 is penetrated in an S-shaped manner to increase the indirect contact area and promote condensation.

[0030] In a possible implementation, the fin condenser 200 is annular as a whole, and the fin condenser 200 includes an input shell 210, an output shell 230 and two or more coaxially arranged first annular pipes 220; the first annular pipe 220 is respectively provided with an inlet and an outlet along the tube walls at the opposite ends of its radial direction, the inlets of the two or more first annular pipes 220 are adjacently distributed along the axial direction of the first annular pipe 220, and a gap is provided between two adjacent first annular pipes 220 to increase the indirect contact area and promote condensation, the outlets of the two or more first annular pipes 220 are adjacently distributed along the axial direction of the first annular pipe 220, and the two or more first annular pipes 220 are connected to the input shell 210 through their inlets, and the side wall of the input shell 210 is provided with a liquid inlet 211 of the fin condenser 200, and the inlets of multiple first annular pipes 220 of the fin condenser 200 converge to the liquid inlet 211 through the input shell 210. The two or more first annular pipes 220 are connected to the output shell 230 through their outlets, and the side wall of the output shell 230 is provided with a liquid outlet 231 of the fin condenser 200, and the outlets of the plurality of first annular pipes 220 are converged to the liquid outlet 231 through the output shell 230. Further, the fin condenser 200 is installed inside the smoke exhaust pipe 100, and one end of the input pipe provided with the liquid inlet 211 passes through the smoke exhaust pipe 100, and one end of the output pipe provided with the liquid outlet 231 passes through the smoke exhaust pipe 100.

[0031] In a possible implementation, the fin condenser 200 is installed in the smoke exhaust pipe 100, one end of the fin condenser 200 provided with a liquid inlet 211 passes through the smoke exhaust pipe 100, and one end of the fin condenser 200 provided with a liquid outlet 231 passes through the smoke exhaust pipe 100, and the groove opening of the oil collecting groove 121 is arranged toward the fin condenser 200. Further, the fin condenser 200 and the smoke exhaust pipe 100 are coaxially arranged, and a preset gap is provided between the side wall of the fin condenser 200 and the inner wall of the smoke exhaust pipe 100.

[0032] In a possible implementation, a support seat 400 is further included; the smoke exhaust pipe 100 is provided with an oil collecting groove 121, one end of the outer wall of which is connected to the support seat 400, and the oil exhaust pipe 300, the liquid inlet 211 of the condenser and the support seat 400 are located at the same end of the smoke exhaust pipe 100 and are arranged adjacent to each other;

[0033] The support base 400 is provided with a preset length A along the radial direction of the smoke exhaust pipe 100. Along the radial direction of the smoke exhaust pipe 100, the protruding length of the oil exhaust pipe 300 protruding out of the outer wall of the smoke exhaust pipe 100 is a preset length B. Along the radial direction of the smoke exhaust pipe 100, the protruding length of the liquid inlet 211 of the fin condenser 200 protruding out of the outer wall of the smoke exhaust pipe 100 is a preset length C. The preset length B and the preset length C are both less than or equal to the preset length A.

[0034] The present application does not impose any specific restrictions on the shape of the oil drain pipe 300, as long as it can drain the condensate in the oil collecting groove 121. A valve may be provided at one end of the oil drain pipe 300 passing through the smoke exhaust pipe 100.

[0035] In a possible implementation, the oil discharge pipeline 300 includes a feed pipe 310, a U-shaped pipe 320 and a discharge pipe 330, the inlet of the feed pipe 310 serves as the oil inlet of the oil discharge pipeline 300, the outlet of the feed pipe 310 and the inlet of the discharge pipe 330 are respectively connected to the U-shaped openings at both ends of the U-shaped pipe 320, the opening direction of the U-shaped pipe 320 is consistent with the radial direction of the smoke exhaust pipe 100, and the opening of the U-shaped pipe 320 faces the axis of the smoke exhaust pipe 100. The outlet of the discharge pipe 330 serves as the oil outlet of the oil discharge pipeline 300.

[0036] In a possible implementation, the feed pipe 310 and the discharge pipe 330 are both long straight pipes, the feed pipe 310 is parallel to one side of the U-shaped pipe 320 , and the discharge pipe 330 is perpendicular to the feed pipe 310 .

[0037] In a possible implementation, the smoke exhaust duct 100 includes a smoke inlet duct 110 and an annular tube. The internal cavity of the smoke inlet duct 110 is in a truncated cone shape. An inlet is provided on the tube wall at the axially thinner end of the truncated cone of the smoke inlet duct 110, and an outlet is provided on the tube wall at the axially thicker end of the truncated cone of the smoke inlet duct 110. The inlet of the smoke inlet duct 110 serves as the smoke inlet of the smoke exhaust duct 100. The second annular duct 120 is provided with a fin condenser 200. An inlet and an outlet are respectively provided at both axial ends of the second annular duct 120. The outlet of the smoke inlet duct 110 is connected to the inlet of the second annular duct 120. The inner wall of the second annular duct 120 is provided with an oil collecting groove 121, and the oil collecting groove 121 is located at one end of the second annular duct 120 along its radial direction.

[0038] In a possible implementation, the smoke exhaust duct 100 also includes a smoke outlet duct 130; the internal cavity of the smoke outlet duct 130 is in a truncated cone shape, an inlet is provided on the tube wall at one end of the truncated cone shape of the smoke outlet duct 130 that is axially thicker, and an outlet is provided on the tube wall at one end of the truncated cone shape of the smoke outlet duct 130 that is axially thinner, and the inlet of the smoke outlet duct 130 is connected to the outlet of the second annular duct 120.

[0039] In a possible implementation, the fin condenser 200 is installed in the smoke exhaust duct 100. The tube wall of the smoke exhaust duct 100 is also provided with a condensation inlet and a condensation outlet, which are respectively oriented toward opposite sides of the smoke exhaust duct 100 along its radial direction. The liquid inlet 211 of the fin condenser 200 passes through the smoke exhaust duct 100 through the condensation inlet, and the liquid outlet 231 of the fin condenser 200 passes through the smoke exhaust duct 100 through the condensation outlet. One end of the fin condenser 200 provided with the liquid inlet 211 is sealed and fixedly connected to the condensation inlet of the smoke exhaust duct 100, so as to support the fin condenser 200 suspended inside the smoke exhaust duct 100. One end of the fin condenser 200 provided with the liquid outlet 231 is sealed and fixedly connected to the condensation outlet of the smoke exhaust duct 100. Furthermore, the inner wall of the condensation inlet and the inner wall of the condensation outlet are both provided with sealing rings, and the elastic expansion and contraction of the sealing rings are utilized to fill the gap between the outer wall of the liquid inlet and outlet 231 of the fin condenser 200 and the inner wall of the condensation inlet and outlet, thereby ensuring the sealing performance and preventing smoke and air leakage.

[0040] In a possible implementation, the rolling oil recovery condenser further includes a vibration part, and the vibration part includes a vibrator 240. The fin condenser 200 is installed inside the smoke exhaust duct 100. The side wall of the fin condenser 200 is connected with the vibrator 240, and the driving end of the vibrator 240 is connected to the side wall of the fin condenser 200 to drive the tube wall of the fin condenser 200 to vibrate, shake off the oil droplets, make them fall into the oil collecting groove 121 and be collected through the oil discharge pipe 300. Further, the vibrator 240 is installed on the inner wall of the annular / spiral annular structure of the fin condenser 200.

[0041] Furthermore, the rolling oil recovery condenser includes more than two vibration parts, the two or more vibration parts are adjacently distributed along the annular / spiral axis of the fin condenser 200, each vibration part includes more than two vibrators 240, and the two or more vibrators 240 of the vibration part are circumferentially distributed around the annular / spiral axis of the fin condenser 200. The vibrator 240 is preferably an ultrasonic vibrator 240. The present application does not impose specific restrictions on the start-up control method of the vibrator 240. A wireless communication control controller can be set outside the smoke exhaust duct 100, or a waterproof wire can be used to electrically connect to an external controller, as long as the opening and closing of the vibrator 240 can be controlled.

[0042] In one possible implementation, a lifting lug 500 is provided on the outer wall of the smoke exhaust duct 100, and the lifting lug 500 and the liquid outlet 231 are located on the same side of the smoke exhaust duct 100 along its radial direction, and the lifting lug 500 and the liquid inlet 211 are respectively located on opposite sides of the smoke exhaust duct 100 along its radial direction, which is convenient for lifting, and is fixedly connected and communicated with the smoke hood 600 fastened above the metal rolling mill, so as to condense and recover the rolling oil.

[0043] In one possible implementation, one end of the oil drain pipe 300 having an oil inlet is connected flush with the inner wall of the end of the oil collecting groove 121 away from its groove-shaped opening. The present application does not limit the specific shape of the oil collecting groove 121, as long as it can collect the condensed rolling oil in the exhaust pipe 100 and take it out using the oil drain pipe 300. The oil collecting groove 121 can be a square groove body with a simple shape and easy production. Alternatively, the inner wall of the end of the oil collecting groove 121 away from its groove-shaped opening is an arc surface, the oil inlet of the oil drain pipe 300 is located at the arc midpoint of the arc surface, and the end of the oil drain pipe 300 having the oil inlet is flush with the arc surface and smoothly connected. In addition, the oil collecting groove 121 can also be a V-shaped groove, the groove opening of the oil collecting groove 121 is located at the opening end of its V-shaped structure, the oil inlet of the oil drain pipe 300 is located at the turning point of the V-shaped structure of the oil collecting groove 121, and the oil drain pipe 300 is provided with an end of the oil inlet that is flush with the inner wall of the end of the oil collecting groove 121 away from its opening and is smoothly connected.

[0044] In a possible implementation, a temperature sensor is provided in the exhaust pipe. This application does not specifically limit the display method of the temperature measurement result of the temperature sensor. The detection end of the temperature sensor can be located in the exhaust pipe. The temperature sensor can be wirelessly connected to an external display device, or a temperature sensor with a display screen can be used, with one end of the display passing through the exhaust pipe to display the temperature measurement result, so as to observe and adjust the temperature flow rate of the heat transfer medium in the condensation pipe, control the temperature in the exhaust pipe, and ensure the effect of condensing oil and gas.

[0045] According to another aspect of the present application, a rolling oil recovery device is provided, comprising a fume hood 600 and a condenser of a fume exhaust pipe 100. The inlet of the fume hood 600 is suitable for being arranged toward the rolled metal, and the fume hood 600 is provided with an exhaust device 610 to suck the oily fume in the metal rolling environment from the inlet of the fume hood 600 and discharge it from the outlet of the fume hood 600; one end of the fume hood 600 provided with the outlet is connected to one end of the fume exhaust pipe 100 provided with the smoke inlet, and the outlet of the fume hood 600 is communicated with the smoke inlet of the fume exhaust pipe 100.

[0046] In a possible implementation, the exhaust device 610 is an exhaust fan, which is fixed inside the fume hood 600. The exhaust fan is suitable for sucking the oily fume at the inlet of the fume hood 600 into the hood body and discharging it from the outlet of the fume hood 600.

[0047] In a possible implementation, the rolling oil recovery device also includes an absorption tower and a vacuum distillation device. The smoke outlet of the smoke exhaust duct 100 is connected to the inlet of the absorption tower. An absorbent for absorbing rolling oil is provided in the absorption tower. The absorbent that absorbs the rolling oil is input into the vacuum distillation device for vacuum distillation, and the rolling oil obtained by distillation is collected.

[0048] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A condenser for rolling oil recovery, characterized in that: include: Smoke exhaust ducts and oil exhaust ducts; The smoke exhaust pipe is provided with a smoke inlet and a smoke outlet at two axial ends thereof, the smoke exhaust pipe is provided with a fin condenser, an oil collecting groove is provided on the inner wall of the smoke exhaust pipe, and the oil collecting groove matches and is arranged opposite to the fin condenser; An oil inlet and an oil discharge port are respectively provided on the wall of the oil discharge pipe. One end of the oil discharge pipe provided with the oil inlet penetrates into the oil collecting groove of the smoke exhaust pipe to communicate with the oil collecting groove. The oil discharge port is located outside the smoke exhaust pipe. The liquid inlet and the liquid outlet of the fin condenser are respectively located on opposite sides of the smoke exhaust pipe along the radial direction thereof. The oil discharge pipe, the liquid inlet and the oil collecting groove are all located on the same side of the smoke exhaust pipe along the radial direction thereof.

2. The rolling oil recovery condenser according to claim 1, characterized in that: The fin condenser is installed in the smoke exhaust pipe, one end of the fin condenser with a liquid inlet passes through the smoke exhaust pipe, the other end of the fin condenser with a liquid outlet passes through the smoke exhaust pipe, and the groove opening of the oil collecting groove is arranged toward the fin condenser.

3. The rolling oil recovery condenser according to claim 2, characterized in that: A preset gap is provided between the side wall of the fin condenser and the inner wall of the smoke exhaust duct.

4. The rolling oil recovery condenser according to claim 1, characterized in that: The fin condenser includes an input shell, an output shell and two or more coaxially arranged first annular pipes, a preset gap is provided between two adjacent first annular pipes, the first annular pipe is connected to the input shell and the output shell at both ends along its radial direction, a liquid inlet is provided on the side wall of the input shell, and a liquid outlet is provided on the side wall of the output shell.

5. The rolling oil recovery condenser according to claim 1, characterized in that: Also includes a support base; The outer wall of one end of the smoke exhaust pipe provided with an oil collecting groove is connected to the support seat, and the oil exhaust pipe, the liquid inlet of the condenser and the support seat are located at the same end of the smoke exhaust pipe and are arranged adjacent to each other.

6. The rolling oil recovery condenser according to claim 1, characterized in that: The oil discharge pipe includes a feed pipe, a U-shaped pipe and a discharge pipe, the inlet of the feed pipe serves as the oil inlet of the oil discharge pipe, the outlet of the feed pipe and the inlet of the discharge pipe are respectively connected to the U-shaped openings at both ends of the U-shaped pipe, the opening of the U-shaped pipe faces the axis of the smoke exhaust pipe, and the outlet of the discharge pipe serves as the oil outlet of the oil discharge pipe.

7. The rolling oil recovery condenser according to claim 6, characterized in that: The feed pipe and the discharge pipe are both long straight pipes. The feed pipe is parallel to one side of the U-shaped pipe, and the discharge pipe is perpendicular to the feed pipe.

8. The rolling oil recovery condenser according to claim 1, characterized in that: The smoke exhaust duct includes a smoke inlet duct and a second annular duct, the internal cavity of the smoke inlet duct is in a truncated cone shape, a smoke inlet port is provided on the tube wall at one end of the truncated cone shape of the smoke inlet duct, the second annular duct and the smoke inlet duct are coaxially arranged and connected, an outlet is provided on the tube wall at one end of the truncated cone shape of the smoke inlet duct, the outlet of the smoke inlet duct is connected to an opening at one axial end of the second annular duct, the second annular duct is provided with a fin condenser, and an oil collecting groove is provided on the inner wall of the second annular duct.

9. The rolling oil recovery condenser according to claim 8, characterized in that: The smoke exhaust duct also includes a smoke outlet duct, the internal cavity of the smoke outlet duct is in a truncated cone shape, an inlet is provided on the tube wall at one end of the truncated cone shape that is axially thicker than the other end of the second annular duct, and a smoke outlet is provided on the tube wall at one end of the truncated cone shape that is axially thinner than the other end of the second annular duct.

10. A rolling oil recovery device, characterized in that: include: A fume hood and a condenser for rolling oil recovery as claimed in any one of claims 1 to 9; The inlet of the fume hood is suitable for being arranged toward the rolling mill, and the fume hood is provided with an exhaust device to suck the oily fume in the metal rolling environment from the inlet of the fume hood and discharge it from the outlet of the fume hood; One end of the smoke hood having an outlet is connected to one end of the smoke exhaust pipe having a smoke inlet, and the outlet of the smoke hood is communicated with the smoke inlet of the smoke exhaust pipe.

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