Oil mist removing device and method for continuous annealing line temper mill

Abstract

According to the oil mist removing device and method for the continuous annealing line temper mill, the temper mill comprises a supporting roller, supporting bearing seats are arranged on the two sides of the supporting roller, bearing sealing devices are arranged on the two sides of bearings on the bearing seats, and the oil mist removing device for the temper mill comprises a wool felt ring, an oil retainer ring and an oil mist removing system. Wherein the wool felt ring is sleeved on the outer side of the bearing sealing device at the joint of the supporting bearing seat and the supporting roller; the oil retainer is arranged on the outer side of the bearing, the top of the wool felt ring covers the joint of the bearing and the supporting roller, a gap is reserved between the oil retainer and the roller surface of the supporting roller, and an oil pumping air hole is formed in the oil retainer; the oil mist removal system comprises an oil gas pumping hose, a first pipeline, a main pipeline, a filter, a fan, a motor and an exhaust port, the oil gas pumping holes are connected with the first pipeline through the oil gas pumping hose, the first pipeline is connected with the main pipeline after being converged, the filter, the fan and the exhaust port are sequentially arranged on the main pipeline from upstream to downstream, and the motor is connected with the fan. According to the method, the overall occurrence probability of plate surface oil spots can be reduced, and the plate surface quality is obviously improved.

Description

Technical Field

[0001] The invention relates to the technical field of iron and steel metallurgy, and in particular to an oil mist removal device and method for a continuous annealing line leveler. Background Art

[0002] The leveling rolling of the cold-rolled tin plate continuous annealing unit is the last key process to produce high-quality thin plates and ensure the quality of cold-rolled strip products. It is divided into wet leveling and dry leveling. Wet leveling is to use leveling liquid at the entrance of the leveling machine or on the surface of the support roller, which can wash away foreign matter, reduce defects such as pits, and play a cooling and lubricating role. It is more beneficial to stabilize the roller shape, but the leveling liquid is easy to remain on the surface of the strip to form spots, and subsequent production will form white spots, affecting the surface quality; dry leveling does not have leveling liquid, but uses rolling oil to play a role in cooling and lubrication, so dry leveling is more beneficial to improving the smoothness of the plate surface.

[0003] There are two types of lubrication for dry leveling: oil mist lubrication and oil-gas lubrication. Oil mist lubrication is a micro-lubrication method that uses compressed air to atomize liquid lubricating oil into 1μm-3μm, suspend it in compressed air to form oil mist, and transport it to various lubrication parts through transmission lines. Since the lubricant and air in the oil mist system are tightly integrated into oil mist, changes in heating temperature, ambient temperature and air pressure will affect the oil delivery, affecting the lubrication and cooling effects. The main difference between oil-gas lubrication and oil mist lubrication is that the lubricating oil supplied to the bearing is not atomized, but compressed air is used to blow oil droplets into the bearing part, which can achieve timed and quantitative oil supply, and has less pollution to the surrounding environment. However, due to factors such as temperature, air pressure and sealing, the support roller of the leveling machine has been leaking oil since it was put into production, which is very easy to cause pollution to the product surface (oil spots on the board surface). This phenomenon is a common problem in the industry. Therefore, it is of great significance to study a system and method to prevent the support roller of the continuous retraction line leveling machine from throwing oil, which can reduce the impact of oil spots on the board surface and further improve product quality. Summary of the invention

[0004] Technical problem to be solved: In view of the problem in the prior art that oil throwing inside the support roller frame of the cold rolling continuous annealing and leveling machine has an adverse effect on the board surface, the present invention proposes an oil mist removal device and method for the continuous annealing and leveling machine, which can reduce the overall probability of oil spots on the board surface and significantly improve the quality of the board surface.

[0005] Technical solution: One of the purposes of the present invention is to provide an oil mist removal device for a continuous annealing line leveler, the leveler comprising a plurality of support rollers, support bearing seats being provided on both sides of the support rollers, bearing sealing devices being provided on both sides of the bearings on the bearing seats, the oil mist removal device for the continuous annealing line leveler comprising: a plurality of wool felt rings, a plurality of oil retaining rings and an oil mist removal system, wherein:

[0006] The wool felt ring is arranged on the outside of the bearing sealing device at the connection between the support bearing seat and the support roller;

[0007] The oil retaining ring is arranged on the outer side of the bearing, on the top of the wool felt ring and covers the connection between the bearing and the support roller, and leaves a gap with the roller surface of the support roller. The oil retaining ring is provided with an oil extraction hole;

[0008] The oil mist removal system includes an oil extraction gas hose, a first pipeline, a main pipeline, a filter, a fan, a motor and an exhaust port. The oil extraction gas hole is connected to the first pipeline through the oil extraction gas hose. Several first pipelines are connected to the main pipeline after being collected. The filter, fan and exhaust port are arranged on the main pipeline from upstream to downstream, and the motor is connected to the fan.

[0009] Preferably, the oil retaining ring is two movably connected semicircular hoops connected by bolts.

[0010] Preferably, the thickness of the oil retaining ring is 30 mm, leaving a gap of 50 mm between the oil retaining ring and the roller surface of the support roller.

[0011] Preferably, the oil mist removal system also includes an alarm light, an operating box, and a pressure sensor. The pressure sensor is arranged between the main pipeline connecting the fan and the filter and is used to monitor the pressure in the main pipeline. The operating box includes a PLC controller or a single-chip microcomputer. The output end of the pressure sensor is connected to the input end of the operating box, and one output end of the operating box is connected to the alarm light.

[0012] Preferably, the oil mist removal system further comprises a circuit breaker, which is arranged between the lines connecting the fan and the motor, and the other output end of the operating box is connected to the circuit breaker.

[0013] Preferably, the width and thickness of the wool felt ring are 30*30mm.

[0014] Preferably, the filter element of the filter is a fiber filter element, and an oil drain port is provided at the bottom of the filter, and the oil drain port is used to discharge oil droplets after filtering by the filter.

[0015] Preferably, the oil mist removal system also includes an air suction volume regulating valve and an air suction port. The air suction volume regulating valve is arranged on the main pipeline upstream of the filter, and the air suction port is arranged between the main pipeline connecting the fan and the filter, for adjusting the air suction volume and air suction speed.

[0016] Preferably, the inner diameters of the oil and gas extraction hose, the first pipeline and the main pipeline increase gradually.

[0017] Another object of the present invention is to provide a method for removing oil mist from a continuous annealing line leveler based on the above device, the steps being as follows:

[0018] Step 1: Install the wool felt ring sleeve on the outer side of the bearing sealing device at the connection between the support bearing seat and the support roller;

[0019] Step 2: Fix the oil retaining ring on the outside of the bearing and the top of the wool felt ring and cover the connection between the bearing and the support roller;

[0020] Step 3: Connect the oil extraction hose of the oil mist removal system to the oil extraction hole, turn on the motor, use the fan to extract air, and the oil mist enters the main pipeline from the oil extraction hole through the oil extraction hose and the first pipeline. When passing through the filter, small oil droplets are filtered and the oil mist is extracted and discharged through the exhaust port.

[0021] Beneficial effects:

[0022] (1) The present invention can absorb the oil mist splashed from the bearing sealing part by providing a wool felt ring, and some oil droplets are absorbed by the wool felt and fall vertically from the wool felt, thereby reducing the splashing of oil droplets;

[0023] (2) The present invention provides an oil deflector ring and innovatively increases the width of the oil deflector ring to extend it to the side of the roller surface, thereby substantially eliminating splashing oil droplets and further improving the quality of the board surface;

[0024] (3) Based on the wool felt ring and the oil retaining ring, the present invention further adds an oil mist removal system, which can extract the oil mist diffused in the frame, thereby greatly improving the quality of the board surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the oil mist distribution after adding a continuous unwinding line leveler oil mist removal device on the support roller of the present invention;

[0026] Figure 2 It is a schematic diagram of the wool felt ring structure;

[0027] Figure 3 Schematic diagram of the oil retaining ring structure, (a) is a top view; (b) is a left view;

[0028] Figure 4 This is a schematic diagram of the oil mist removal system structure;

[0029] Figure 5 Schematic diagram for connection of alarm lights, operation boxes, pressure sensors and circuit breakers

[0030] Figure 6 This is a schematic diagram of the oil mist distribution of the existing support roller in Comparative Example 1;

[0031] Figure 7 This is a schematic diagram of the oil mist distribution after adding the wool felt ring in Comparative Example 2;

[0032] Figure 8 This is a schematic diagram of the oil mist distribution after adding a wool felt ring and a common oil deflector ring in Comparative Example 3;

[0033] Fig. 9This is a schematic diagram of the oil mist distribution after adding a wool felt ring and widening the oil deflector ring in Comparative Example 4.

[0034] The numbers in the figure represent the following: 1. felt ring; 2. oil retaining ring; 201. oil extraction hole; 3. oil mist removal system; 301. oil extraction hose; 302. first pipeline; 303. main pipeline; 304. filter; 305. fan; 306. motor; 307. exhaust port; 308. operation box; 309. alarm light; 310. pressure sensor; 311. circuit breaker; 312. air suction volume regulating valve; 313. air suction port; 314. oil discharge port; 4. upper support roller; 5. lower support roller; 6. bearing. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] The leveling machine in the embodiment of this specification has 8 rollers, namely 4 working rollers and 4 supporting rollers.

[0037] Example 1

[0038] This embodiment provides an oil mist removal device for a continuous unwinding line leveling machine.

[0039] In the prior art, the leveling machine includes four support rollers, including two upper support rollers 4 and two lower support rollers 5. Support bearing seats are provided on both sides of the support rollers, and bearing sealing devices (generally sealing rings or sealing pads, etc.) are provided on both sides of the bearing 6 on the bearing seat, but the sealing performance is not good and there is oil leakage.

[0040] See also Figure 1-4 The de-oiling mist removing device of the continuous annealing line leveler described in this embodiment comprises: 8 wool felt rings 1, 8 oil retaining rings 2 and de-oiling mist removing system 3, wherein:

[0041] See also Figure 2 The wool felt ring 1 is sleeved on the outside of the bearing sealing device at the connection between the supporting bearing seat and the supporting roller.

[0042] See also Figure 3 The oil retaining ring 2 is arranged outside the bearing, on the top of the wool felt ring 1, covers the connection between the bearing and the support roller, and leaves a gap with the roller surface of the support roller. The oil retaining ring is provided with an oil extraction hole 201. Due to different oil leakage conditions, in this embodiment, an oil extraction hole 201 is respectively provided at the top and bottom of the oil retaining ring 2 where the upper support roller 4 is located, and an oil extraction hole 201 is provided at the top of the oil retaining ring 2 where the lower support roller 5 is located.

[0043] See also Figure 4The oil mist removal system 3 includes an oil extraction gas hose 301, a first pipeline 302, a main pipeline 303, a filter 304, a fan 305, a motor 306 and an exhaust port 307. The oil extraction gas hole 201 is connected to the first pipeline 302 through the oil extraction gas hose 301. The six first pipelines 302 are collected and connected to the main pipeline 303. The filter 304, the fan 305 and the exhaust port 307 are arranged on the main pipeline 303 from upstream to downstream, and the motor 306 is connected to the fan 305.

[0044] A method for removing oil mist from a continuous annealing line leveler based on the above device, the steps are as follows:

[0045] Step 1: Sleeve the wool felt ring 1 onto the outer side of the bearing sealing device at the connection between the support bearing seat and the support roller;

[0046] Step 2: fix the oil retaining ring 2 to the outside of the bearing, the top of the wool felt ring and cover the connection between the bearing and the support roller;

[0047] Step 3, connect the oil extraction hose 301 of the oil mist removal system 3 to the oil extraction air hole 201, turn on the motor 306, use the fan 305 to extract air, and the oil mist enters the main pipeline 303 from the oil extraction air hole 201 through the oil extraction hose 301 and the first pipeline 302. When passing through the filter 304, the small oil droplets are filtered, and the oil mist is extracted and discharged through the exhaust port 307.

[0048] Example 2

[0049] Same as Example 1, except that, see Figure 3 The oil retaining ring is two semicircular clamps that are movably connected and connected by bolts. Figure 3 (b) The oil extraction hole 201 at the bottom is opened according to the oil leakage situation. The thickness of the oil retaining ring is 30mm, and there is a gap of 50mm between it and the roller surface of the support roller. The material is 304 stainless steel.

[0050] The inner diameters of the oil and gas extraction hose 301 , the first pipeline 302 and the main pipeline 303 increase gradually.

[0051] See also Figure 4 and 5The oil mist removal system 3 also includes an alarm light 309, an operation box 308, a pressure sensor 310, an air suction volume regulating valve 312 and an air suction port 313. The pressure sensor 310 is arranged between the main pipeline 303 connected to the fan 305 and the filter 304, and is used to monitor the pressure in the main pipeline 303. The operation box 308 includes a PLC controller or a single-chip microcomputer (a single-chip microcomputer in this embodiment). The output end of the pressure sensor 310 is connected to the input end of the operation box 308, and one output end of the operation box 308 is connected to the alarm light 309. The air suction volume regulating valve 312 is arranged on the main pipeline 303 upstream of the filter 304, and the air suction port 313 is arranged between the main pipeline 303 connected to the fan 305 and the filter 304, and is used to adjust the air suction volume and air suction speed.

[0052] The oil mist removal system further includes a circuit breaker 311 , which is disposed between the circuits connecting the fan 305 and the motor 306 , and the other output end of the operation box 308 is connected to the circuit breaker 311 .

[0053] The width and thickness of the wool felt ring 1 are 30*30 mm.

[0054] The filter element of the filter 304 is a fiber filter element, and an oil discharge port 314 is provided at the bottom of the filter 304. The oil discharge port 314 is used to discharge oil droplets after being filtered by the filter.

[0055] The oil mist removal system 3 added by the present invention removes the gas mist above the bearing and the oil mist below the wool felt on the outside of the bearing and the oil retaining ring through the oil extraction air hole 201, forming an air extraction structure with internal air extraction and external oil extraction, which can efficiently remove the oil mist. The fan can be equipped with two 3.5kw fans in parallel to provide sufficient power to handle the oil mist and ensure the efficient operation of the entire system. The present invention forms an overall oil mist removal system by setting a filter 304, a reducer (the inner diameter of the oil extraction air hose 301, the first pipeline 302 and the main pipeline 303 increases), an operating box 308, an alarm light 309 and other devices. When the oil mist is extracted through the filter element of the filter 304, the small oil droplets are intercepted by the filter element, and the oil mist is extracted and discharged through the exhaust port 307. The air suction volume and air suction speed of the system can be further regulated by adjusting the opening degree of the air suction port 313 to improve the overall air extraction effect. When the fan 305 fails or the filter is clogged, the pressure sensor transmits the sensing result to the single-chip microcomputer in the operation box. The single-chip microcomputer responds and controls the alarm light to light up to remind the staff to check and deal with the problem in time; at the same time, the circuit breaker is started to shut down the fan 305 to prevent safety accidents.

[0056] Comparative Example 1

[0057] The prior art does not take any measures, that is, does not add the wool felt ring 1, the oil retaining ring 2 and the oil mist removal system 3, and only relies on the bearing sealing device.

[0058] For the oil mist distribution of the support roller, refer to Figure 6 As can be seen from the figure, the oil leakage points inside the leveling machine are concentrated at the interface between the support roller bearing seat and the roller. When running at high speed, oil droplets can easily splash onto the surface of the support roller and be brought to the plate surface.

[0059] Comparative Example 2

[0060] Same as Example 2, except that the oil deflector ring 2 and the oil mist removal system 3 are not added, and only the wool felt ring 1 is added. Figure 7 As can be seen from the figure, after adding the wool felt ring 1, the sealing oil absorption effect can be improved, but some oil droplets are absorbed by the wool felt and fall vertically from the wool felt. The oil droplets splashing onto the roller surface are reduced, but some oil droplets still splash onto the strip surface.

[0061] Comparative Example 3

[0062] Same as Example 2, except that the oil mist removal system 3 is not added, and only the wool felt ring 1 and the narrow oil retaining ring 2 are added (the oil retaining ring only covers the bearing 6 and the wool felt ring 1). Figure 8 ,As can be seen from the figure, after adding the narrow oil baffle ring, the splashing oil droplets are greatly reduced, but some oil droplets still fly onto the strip.

[0063] Comparative Example 4

[0064] Same as Example 2, except that the de-oiling mist system 3 is not added, only the wool felt ring 1 and the widened oil retaining ring 2 are added (the oil retaining ring not only covers the bearing 6 and the wool felt ring 1, but also extends to the roller surface, leaving a gap of 50 mm with the roller surface). Fig. 9 As can be seen from the figure, after increasing the width of the oil retaining ring, the splashing oil droplets are basically eliminated, and the board surface quality is further improved, >1mm 2 The oil spots on the board are basically gone, but there are still some spots on the board ≤1mm 2 Small oil droplets. Investigations have found that since the oil-gas lubrication method relies on compressed air to pump oil droplets into the lubrication points, oil mist will form in the frame. As the strip runs at high speed, it will inevitably fall onto the roller surface, affecting the surface quality of the strip.

[0065] Accordingly, the measures of Example 2 and Comparative Examples 1-4 were put into production, and the specific distribution of the oil spot size and occurrence ratio after the improvement is shown in Table 1.

[0066] Table 1 Improvement of oil spots

[0067]

[0068]

[0069] It can be seen from the table that when there is no measure in production, the overall occurrence rate of oil spots is extremely high and is greater than 20mm. 2 The proportion of large oil spots is close to 50%; after adding wool felt, the proportion of oil spots is reduced, >5mm 2 The proportion of oil spots has been reduced; after adding a new fully enclosed oil baffle ring, >5mm 2 The proportion of oil spots decreased significantly, but <5mm 2 The proportion of oil spots increases; after improving and widening the oil retaining ring, >1mm 2 The proportion of oil spots decreased significantly, but <1mm 2 The oil spots still have a high incidence rate; when the oil mist removal system is put into use, the overall occurrence rate of oil spots is reduced, the use effect is better, and the board surface quality is significantly improved.

[0070] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned implementation modes, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the implementation modes of the present invention.

Claims

1. A de-oiling mist removing device for a continuous unwinding leveling machine, the leveling machine comprises a plurality of supporting rollers, support bearing seats are arranged on both sides of the supporting rollers, and bearing sealing devices are arranged on both sides of the bearings on the bearing seats, characterized in that: The de-oiling mist device of the continuous annealing line leveler comprises: a plurality of wool felt rings, a plurality of oil baffle rings and an de-oiling mist system, wherein: The wool felt ring is arranged on the outside of the bearing sealing device at the connection between the support bearing seat and the support roller; The oil retaining ring is arranged on the outer side of the bearing, on the top of the wool felt ring and covers the connection between the bearing and the support roller, and leaves a gap with the roller surface of the support roller. The oil retaining ring is provided with an oil extraction hole; The oil mist removal system includes an oil extraction gas hose, a first pipeline, a main pipeline, a filter, a fan, a motor and an exhaust port. The oil extraction gas hole is connected to the first pipeline through the oil extraction gas hose. Several first pipelines are connected to the main pipeline after being collected. The filter, fan and exhaust port are arranged on the main pipeline from upstream to downstream, and the motor is connected to the fan.

2. The de-oiling mist removal device of the continuous annealing line leveler according to claim 1 is characterized in that: The oil retaining ring is two semicircular hoops that are movably connected and connected by bolts.

3. The de-oiling mist removal device of the continuous annealing line leveler according to claim 1 is characterized in that: The thickness of the oil retaining ring is 30mm, leaving a gap of 50mm between it and the surface of the support roller.

4. The oil mist removal device of the continuous annealing line leveler according to claim 1 is characterized in that: The oil mist removal system also includes an alarm light, an operation box, and a pressure sensor. The pressure sensor is arranged between the main pipeline connecting the fan and the filter, and is used to monitor the pressure in the main pipeline. The operation box includes a PLC controller or a single-chip microcomputer. The output end of the pressure sensor is connected to the input end of the operation box, and one output end of the operation box is connected to the alarm light.

5. The de-oiling mist removal device of the continuous annealing line leveler according to claim 4 is characterized in that: The oil mist removal system also includes a circuit breaker, which is arranged between the lines connecting the fan and the motor, and the other output end of the operation box is connected to the circuit breaker.

6. The de-oiling mist removal device of the continuous annealing line leveler according to claim 1 is characterized in that: The width and thickness of the wool felt ring are 30*30mm.

7. The de-oiling mist removal device of the continuous annealing line leveler according to claim 1 is characterized in that: The filter element of the filter is a fiber filter element, and an oil discharge port is arranged at the bottom of the filter, and the oil discharge port is used to discharge oil droplets after being filtered by the filter.

8. The de-oiling mist removal device of the continuous annealing line leveler according to claim 1 is characterized in that: The oil mist removal system also includes an air suction volume regulating valve and an air suction port. The air suction volume regulating valve is arranged on the main pipeline upstream of the filter, and the air suction port is arranged between the main pipeline connecting the fan and the filter, for adjusting the air suction volume and air suction speed.

9. The de-oiling mist removal device of the continuous annealing line leveler according to claim 1, characterized in that: The inner diameters of the oil and gas extraction hose, the first pipeline and the main pipeline increase gradually.

10. A method for removing oil mist from a continuous annealing line leveler based on the device described in any one of claims 1 to 9, characterized in that: Here are the steps: Step 1: Install the wool felt ring sleeve on the outer side of the bearing sealing device at the connection between the support bearing seat and the support roller; Step 2: Fix the oil retaining ring on the outside of the bearing and the top of the wool felt ring and cover the connection between the bearing and the support roller; Step 3: Connect the oil extraction hose of the oil mist removal system to the oil extraction hole, turn on the motor, use the fan to extract air, and the oil mist enters the main pipeline from the oil extraction hole through the oil extraction hose and the first pipeline. When passing through the filter, small oil droplets are filtered and the oil mist is extracted and discharged through the exhaust port.

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