Reversible cold rolling mill emulsion purging oil removal device

Abstract

The application discloses a device for blowing and removing emulsion of a reversible cold rolling mill, which is fixedly connected with a frame of the rolling mill and comprises a lifting baffle and a lower-plate emulsion spraying beam, the lifting baffle is connected with a lifting hydraulic cylinder fixed on the frame, the lower end of the lifting baffle is provided with an upper-plate emulsion spraying beam, the upper-plate emulsion spraying beam is provided with emulsion nozzles and emulsion interfaces, the outer side of the upper-plate emulsion spraying beam is provided with an upper-plate blowing beam, the upper-plate blowing beam is provided with blowing nozzles and air blowing interfaces; the lower-plate emulsion spraying beam is fixed, the lower-plate emulsion spraying beam is also provided with emulsion nozzles and emulsion interfaces, the outer side of the lower-plate emulsion spraying beam is provided with a lower-plate blowing beam, and the lower-plate blowing beam is provided with blowing nozzles and air blowing interfaces, so that the application can effectively prevent backflow of inlet emulsion and eliminate residual emulsion on the outlet plate.

Description

Technical Field

[0001] This invention belongs to the technical field of cold rolling equipment for strip steel, and relates to a reversible cold rolling mill emulsion purging and degreasing device. Background Technology

[0002] In a single-stand reversible cold rolling production line for strip steel, sufficient emulsion spraying is required at the mill inlet to lubricate and cool the rolls and strip surface. At the mill outlet, sealing and air purging are implemented to ensure strip surface cleanliness. Oil removal rollers and purging devices are installed at both the mill inlet and outlet to prevent backflow of inlet emulsion from interfering with inlet thickness gauge measurements, and to eliminate residual emulsion on the strip surface at the outlet, ensuring strip surface quality.

[0003] like Figure 1 The diagram shows the layout of a single-stand six-high reversible rolling mill with four degreasing rolls. During the first pass of strip threading or the last pass of finishing, the degreasing rolls open their gaps; during rolling, the gaps close to remove oil. When the mill rolls from left to right, the emulsion on the left side (inlet) of the mill stand is open, while the emulsion on the right side (outlet) is closed, and the right side (outlet) degreasing device is activated. During reversal rolling, the inlet and outlet emulsions are switched and the purging process is changed accordingly.

[0004] The existing degreasing roller mechanism is complex and has high maintenance costs, especially in high-speed rolling mills where the accident rate is high. Summary of the Invention

[0005] The purpose of this invention is to provide a reversible cold rolling mill emulsion purging and degreasing device that can replace the degreasing roller device, effectively prevent backflow of inlet emulsion, and eliminate emulsion residue on the outlet strip surface.

[0006] The technical solution adopted in this invention is a reversible cold rolling mill emulsion purging and degreasing device, which is set at the inlet and outlet of the rolling mill and fixedly connected to the mill's gate. It includes a lifting baffle and a lower plate surface emulsion spray beam. The lifting baffle is connected to a lifting hydraulic cylinder fixed on the gate. An upper plate surface emulsion spray beam is set at the lower end of the lifting baffle. An emulsion nozzle is set on the upper plate surface emulsion spray beam. An emulsion interface is connected to the upper plate surface emulsion spray beam. An upper plate surface purging beam is set on the outside of the upper plate surface emulsion spray beam. An air purging interface is connected to the upper plate surface purging beam. A purging nozzle is set on the upper plate surface purging beam.

[0007] Both ends of the lower plate surface emulsion spray beam are equipped with lower plate surface spray beam supports, which are fixedly connected to the archway. The lower plate surface emulsion spray beam is also equipped with emulsion nozzles and emulsion interfaces. A lower plate surface blowing beam is set on the outside of the lower plate surface emulsion spray beam. The lower plate surface blowing beam is equipped with blowing nozzles and air blowing interfaces. The emulsion nozzles of the lower plate surface emulsion spray beam and the emulsion nozzles of the upper plate surface emulsion spray beam, as well as the blowing nozzles of the upper plate surface blowing beam and the blowing nozzles of the lower plate surface blowing beam, are symmetrically distributed with the rolling line of the rolling mill as the axis of symmetry. The spray direction of the emulsion nozzles and the blowing direction of the blowing nozzles are both towards the inside of the rolling mill.

[0008] The invention is further characterized in that,

[0009] It also includes two guide seats fixed on the archway and located on both sides of the lifting baffle. The guide seats have grooves on the side near the lifting baffle. The groove openings of the two guide seats are opposite each other. The two end faces of the lifting baffle are located in the grooves of the two guide seats respectively, and the lifting baffle moves up and down along the length of the groove of the guide seat.

[0010] There are two lifting hydraulic cylinders, which are located on both sides of the lifting baffle.

[0011] Positioning screws are installed on the upper ends of both sides of the lifting baffle, and the positioning screws limit the movement of the baffles with the blocks on the guide seat.

[0012] There are multiple emulsion nozzles and multiple purging nozzles, and the multiple emulsion nozzles and multiple purging nozzles are set at equal distances.

[0013] The blowing nozzles of the upper plate blowing beam are flat, high-volume, high-power nozzles, model BJ804.

[0014] The blowing nozzles of the lower plate blowing beam are flat nozzles, model BJ973.

[0015] A protective cover is provided on the lower outer side of the lifting baffle. The bottom of the protective cover is open and covers the emulsion spray beam and the sweeping beam on the upper plate. The sweeping beam on the upper plate is fixed inside the protective cover.

[0016] The two ends of the lower plate blowing beam are respectively fixed on the two lower plate spray beam supports.

[0017] The beneficial effects of this invention are:

[0018] The present invention relates to a reversible cold rolling mill emulsion purging and degreasing device, which has a simple structure, shortens the length of the unit, and improves the yield. By placing the emulsion purging and degreasing device at the inlet and outlet of the rolling mill, the need for degreasing rollers is eliminated. This achieves the functions of preventing backflow of inlet emulsion and eliminating emulsion residue on the strip surface at the outlet, reducing the accident rate and maintenance costs, while making it possible to achieve high-speed and stable rolling. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the unit layout with inlet and outlet oil removal rollers;

[0020] Figure 2 This is a schematic front view of the reversible cold rolling mill emulsion purging and degreasing device of the present invention;

[0021] Figure 3 This is a top view of the structural schematic diagram of the reversible cold rolling mill emulsion purging and degreasing device of the present invention;

[0022] Figure 4 This is a schematic diagram of the unit layout where the reversible cold rolling mill emulsion purging and degreasing device of the present invention is installed at the inlet and outlet of the rolling mill;

[0023] Figure 5 This is a side view of the reversible cold rolling mill emulsion purging and degreasing device of the present invention, and a working diagram at the inlet.

[0024] Figure 6 This is a side view of the reversible cold rolling mill emulsion purging and degreasing device of the present invention, and a working diagram at the outlet.

[0025] In the diagram, 1. Lifting baffle, 2. Upper plate surface emulsion spray beam, 3. Protective cover, 4. Upper plate surface blowing beam, 5. Steel strip, 6. Lower plate surface emulsion spray beam, 7. Lower plate surface blowing beam, 8. Positioning screw, 9. Lifting hydraulic cylinder, 10. Guide seat, 11. Lower plate surface spray beam support, 12. Emulsion nozzle, 13. Emulsion interface, 14. Air blowing interface, 15. Blowing nozzle. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] This invention relates to a reversible cold rolling mill emulsion purging and degreasing device, such as... Figures 2-3 As shown, the frame of the rolling mill is fixedly connected, including a lifting baffle 1 and a lower plate emulsion spray beam 6. It also includes two guide seats 10 fixed on the frame and located on both sides of the lifting baffle 1. The guide seats 10 have grooves on the side near the lifting baffle 1. The groove openings of the two guide seats 10 are opposite each other. The two end faces of the lifting baffle 1 are located in the grooves of the two guide seats 10 respectively. The lifting baffle 1 moves up and down along the length of the groove of the guide seat 10. Lifting hydraulic cylinders 9 fixed on the frame are connected to both sides of the lifting baffle 1. Positioning screws 8 are provided on the upper ends of both sides of the lifting baffle 1. The positioning screws 8 cooperate with the stops on the guide seats 10 to limit the movement. By adjusting the positioning screws 8, the lifting baffle can be accurately positioned to the lowest position. The bottom end face of the lifting baffle 1 is lined with a nylon plate.

[0028] The lower end of the lifting baffle 1 is provided with an upper plate surface emulsion spray beam 2. Multiple emulsion nozzles 12 are arranged at equal intervals on the upper plate surface emulsion spray beam 2. The upper plate surface emulsion spray beam 2 is connected to an emulsion interface 13. An upper plate surface blowing beam 4 is provided on the outside of the upper plate surface emulsion spray beam 2. The upper plate surface blowing beam 4 is connected to an air blowing interface 14. Multiple blowing nozzles 15 are arranged at equal intervals on the upper plate surface blowing beam 4. The blowing nozzles 15 of the upper plate surface blowing beam 4 are flat, high-volume, high-power nozzles, model BJ804. A protective cover 3 is provided on the lower outer side of the lifting baffle 1. The bottom of the protective cover 3 is open, and the protective cover 3 covers the upper plate surface emulsion spray beam 2 and the upper plate surface blowing beam 4. The upper plate surface blowing beam 4 is fixed inside the protective cover 3.

[0029] The lower plate surface emulsion spray beam 6 is fixedly connected to the archway via lower plate surface spray beam supports 11 located at both ends. The lower plate surface emulsion spray beam 6 is also equipped with an emulsion interface 13 and multiple equally spaced emulsion nozzles 12. A lower plate surface blowing beam 7 is provided on the outer side of the lower plate surface emulsion spray beam 6. The two ends of the lower plate surface blowing beam 7 are also fixed on the lower plate surface spray beam supports 11. The lower plate surface blowing beam 7 is also equipped with an air blowing interface and multiple equally spaced blowing nozzles 15. The blowing nozzle 15 of the lower plate blowing beam is a flat nozzle, model BJ973. The emulsion nozzle 12 of the lower plate emulsion spray beam 6 and the emulsion nozzle 12 of the upper plate emulsion spray beam 2, the blowing nozzle 15 of the upper plate blowing beam 4 and the blowing nozzle 15 of the lower plate blowing beam 7 are symmetrically distributed with the rolling line of the rolling mill as the axis of symmetry. The spraying direction of the emulsion nozzle 12 and the blowing direction of the blowing nozzle 15 are both facing the inside of the rolling mill.

[0030] The specific working process of the reversible cold rolling mill emulsion purging and degreasing device of the present invention is as follows:

[0031] like Figure 4 As shown, the reversible cold rolling mill emulsion purging and degreasing device of the present invention is installed at the inlet and outlet of the rolling mill.

[0032] When the strip is in a tension-free free state during the first threading or the last threading, the lifting hydraulic cylinder 9 extends to its maximum stroke and the lifting baffle 1 is fully raised, which allows the strip to pass smoothly and avoids scratching.

[0033] During rolling, such as Figure 4 As shown, all emulsion nozzles 12 on the mill inlet side spray a large flow of emulsion. Although the steel strip speed is inward and the emulsion nozzles 12 spray inward, due to the obstruction of the rolls, a large amount of emulsion still exists on the upper surface of the steel strip 5 on the mill inlet side, and it flows outward under certain pressure.

[0034] Rolling mill inlet side Figure 5, the lifting baffle 1 falls down, and the bottom end surface of the lifting baffle 1 forms a parallel-plate gap with the steel belt 5. According to the gap flow formula between the parallel plates:

[0035]

[0036] Note: Q - emulsion outflow, m 3 ·s -1

[0037] △p - emulsion pressure difference inside and outside the baffle, Pa

[0038] δ - gap, m; δ << L, δ << B

[0039] μ - dynamic viscosity of emulsion, Pa·s

[0040] U - steel belt speed, m·s -1

[0041] L - baffle bottom end surface width, m

[0042] B - steel belt width, m

[0043] As can be seen from the above formula: the gap decreases, the steel belt 5 speed increases, and the emulsion pressure inside the lifting baffle 1 decreases, and the emulsion outflow decreases. According to the theory and field experience, we adjust the appropriate gap through the positioning screw 8, set different emulsion injection flow according to different steel belt 5 speed, and adjust the emulsion pressure inside the lifting baffle 1, and then add the counter-injection effect of the upper emulsion injection beam 2 to effectively reduce the emulsion pressure inside the lifting baffle 1, so as to realize the emulsion outflow less than 0 and prevent the inlet emulsion backflow.

[0044] During rolling, as shown in Figure 4 , the emulsion nozzle 12 at the outlet side of the rolling mill does not spray emulsion, and due to the blocking of the roller and the isolation of the splash plate, there is only a small amount of splashed emulsion residue on the upper and lower surfaces of the steel belt 5.

[0045] As shown in Figure 6 , the lifting baffle 1 at the outlet is lifted by 50 mm to stop, ensuring effective purging space and distance, and the upper and lower purging beams 4 and 7 at the outlet are opened for purging, and the flat type large blowing force nozzle can form an upper and lower air wall to blow away the residual emulsion on the plate surface, realizing the elimination of emulsion residue on the plate surface at the outlet.

Claims

1. A device for purging oil from emulsion in a reversible cold rolling mill, which is arranged at the entrance and exit of the mill and fixedly connected with the housing of the mill, characterized in that, The utility model relates to a kind of emulsion injection device for strip rolling mill, including lifting baffle (1) and lower plate surface emulsion injection beam (6), the lifting baffle (1) is connected with fixed lifting hydraulic cylinder (9) on purlin, the lifting hydraulic cylinder (9) is provided with two, two the lifting hydraulic cylinder (9) is located lifting baffle (1) two sides respectively, the lifting baffle (1) lower end is provided with upper plate surface emulsion injection beam (2), the upper plate surface emulsion injection beam (2) is provided with emulsion nozzle (12) on, the upper plate surface emulsion injection beam (2) is connected with emulsion interface (13), the upper plate surface emulsion injection beam (2) outside is provided with upper plate surface blowing beam (4), the upper plate surface blowing beam (4) is connected with air blowing interface (14), the upper plate surface blowing beam (4) is provided with blowing nozzle (15) on, the lower plate surface emulsion injection beam (6) both ends are provided with lower plate surface injection beam support (11), the lower plate surface injection beam support (11) is fixedly connected with purlin, the lower plate surface emulsion injection beam (6) is also provided with emulsion nozzle (12), emulsion interface, the lower plate surface emulsion injection beam (6) outside is provided with lower plate surface blowing beam (7), the lower plate surface blowing beam (7) is provided with blowing nozzle (15), air blowing interface (14), the emulsion nozzle (12) of the lower plate surface emulsion injection beam (6) and the emulsion nozzle (12) of upper plate surface emulsion injection beam (2), the blowing nozzle (15) of upper plate surface blowing beam (4) and the blowing nozzle (15) of lower plate surface blowing beam (7) are symmetrically distributed with the straight line where the rolling line of rolling mill is located as axis of symmetry, and the injection direction of the emulsion nozzle (12), the blowing direction of blowing nozzle (15) are all towards the direction of rolling mill inside; Still include two fixed in purlin and located lifting baffle (1) two sides' guide seat (10), the side close to lifting baffle (1) of guide seat (10) is provided with recess, the recess opening of two guide seat (10) is opposite, the both ends surface of lifting baffle (1) is located in the recess of two guide seat (10) correspondingly, and lifting baffle (1) moves up and down along the length direction of guide seat (10) recess, the both ends upper end of lifting baffle (1) is provided with locating screw (8), the locating screw (8) is limited with the stopper on guide seat (10), the lower outside of lifting baffle (1) is provided with protective cover (3), the bottom of protective cover (3) is open, and the protective cover (3) covers upper plate surface emulsion injection beam (2) and upper plate surface blowing beam (4), upper plate surface blowing beam (4) is fixed in the inside of protective cover (3); Lifting baffle (1) falls, and the bottom end surface of lifting baffle (1) forms parallel flat seam gap with steel belt (5), the gap amount is adjusted appropriately by locating screw (8), different emulsion injection flow is set according to different steel belt (5) speed, so as to adjust emulsion pressure in lifting baffle (1), and then realize preventing inlet emulsion backflow by the counter-jetting action of upper plate surface emulsion injection beam (2). ​ 2. The emulsion skimming device according to claim 1, characterized in that The emulsion nozzles (12) and the blowing nozzles (15) are provided in plurality, and the emulsion nozzles (12) and the blowing nozzles (15) are provided equidistantly.

3. The emulsion skimming device according to claim 1, characterized in that The blowing nozzles (15) of the upper plate surface blowing beam (4) are flat type large blowing amount powerful nozzles, and the model is BJ804.

4. The emulsion skimming device according to claim 1, characterized in that The blowing nozzles (15) of the lower plate surface blowing beam are flat type nozzles, and the model is BJ973.

5. The emulsion skimming device of claim 1, wherein, The lower plate surface blowing beam (7) is fixed at both ends on two lower plate surface injection beam supports (11) respectively.

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