Jet beam and its maintenance method, twenty-high rolling mill and its working method

Abstract

The present invention relates to a spraying beam. A strip running channel is formed inside the beam. An upper spraying plate and a lower spraying plate are provided at the front end of the beam. Both the upper spraying plate and the lower spraying plate are hinged to the beam, and the axial direction of the hinge axis is parallel to the width direction of the strip running channel. A driving mechanism is provided on the beam. The driving mechanism is used to drive the upper spraying plate to swing downward while the lower spraying plate remains in place, and to drive the lower spraying plate to swing upward while the upper spraying plate remains in place; or the driving mechanism is used to drive the two spraying plates to swing upward or downward synchronously. In addition, it also relates to a maintenance method of the spraying beam, a twenty-high rolling mill using the spraying beam, and a working method of the twenty-high rolling mill. By using the same set of driving equipment to achieve the downward swing of the upper spraying plate and the upward swing of the lower spraying plate, the present invention reduces the required driving equipment, thus effectively saving the equipment installation space and facilitating the normal and stable production of a compact twenty-high rolling mill, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of steel rolling, and in particular relates to a spray beam and a maintenance method thereof, a twenty-high rolling mill using the spray beam, and a working method of the twenty-high rolling mill. Background Art

[0002] With the continuous progress of social science and technology, the steel and metallurgical industry has higher and higher requirements for strip products, not only requiring better surface quality, but also requiring thinner and stronger strip products. In order to roll thinner strips, the diameter of the working rolls should be reduced as much as possible, but the reduction in the diameter of the working rolls will reduce the stiffness of the rolls. The twenty-high mill with an integral arch design solves this problem well. However, due to the tower-type roll system layout and the overall arch design of the twenty-high mill, the internal structure is compact and the space is small. The large amount of heat generated during the rolling of the strip cannot be taken away in time, and the rolling also requires lubrication of the roll system. At present, the emulsion spraying beam is basically arranged on both sides to spray the emulsion to ensure that the roll system is adequately lubricated and the heat is quickly taken away. At the same time, the spraying beam needs to be driven by a hydraulic cylinder to lift or press down the strip when changing the rolls, which is convenient for the replacement of the working rolls. However, the design of the hydraulic cylinder requires the removal of the hydraulic cylinder, piping and linkage when replacing the backing roller, which can easily lead to hydraulic oil leakage. The operation is cumbersome, time-consuming and labor-intensive. In addition, the upper and lower spray beams of the strip must be driven by hydraulic cylinders to lift and press the strip. The two hydraulic cylinders are arranged in a very compact position and are very likely to interfere with other equipment. Summary of the invention

[0003] The present invention relates to a spray beam and a maintenance method thereof, a twenty-high rolling mill using the spray beam and a working method of the twenty-high rolling mill, which can at least solve some defects of the prior art.

[0004] The present invention relates to a spray beam, comprising a beam body, a steel strip running channel is formed in the beam body, an upper spray plate and a lower spray plate are arranged at the front end of the beam body, the upper spray plate and the lower spray plate are arranged at the upper and lower sides of the steel strip running channel and are both provided with emulsion nozzles, the upper spray plate and the lower spray plate are both hinged to the beam body and the hinge axis is axially parallel to the width direction of the steel strip running channel; a driving mechanism is arranged on the beam body, and the upper spray plate and the lower spray plate are both transmission-connected to the driving mechanism,

[0005] The driving mechanism is used to drive the upper injection plate to swing downward while the lower injection plate remains in place, and is used to drive the lower injection plate to swing upward while the upper injection plate remains in place;

[0006] Alternatively, the driving mechanism is used to drive the two injection plates to swing upward or downward synchronously.

[0007] As one of the implementation manners, the driving mechanism includes a limiting plate and a power unit for driving the limiting plate to perform a translational movement relative to the beam body; an upper limiting groove and a lower limiting groove are provided on the limiting plate, and transmission rollers are respectively provided in the two limiting grooves. The upper transmission roller in the upper limiting groove is in transmission connection with the upper hinge shaft, and the lower transmission roller in the lower limiting groove is in transmission connection with the lower hinge shaft; both the upper limiting groove and the lower limiting groove have transmission sections, and the groove length directions of the respective transmission sections have an included angle with the translational direction of the limiting plate. The corresponding spraying plates are driven to perform a swinging movement accordingly through the movement of the transmission rollers in the corresponding transmission sections.

[0008] As one of the implementation manners, both the upper limiting groove and the lower limiting groove further have guiding sections, and the groove length directions of the respective guiding sections are parallel to the translational direction of the limiting plate; the relative position relationship between the upper limiting groove and the lower limiting groove satisfies:

[0009] When the upper transmission roller moves in the transmission section of the upper limiting groove, the lower transmission roller moves in the guiding section of the lower limiting groove; when the lower transmission roller moves in the transmission section of the lower limiting groove, the upper transmission roller moves in the guiding section of the upper limiting groove.

[0010] As one of the implementation manners, when the upper spraying plate and the lower spraying plate are in the spraying position, the two transmission rollers are respectively located at the junction of the transmission section and the guiding section of the corresponding limiting groove.

[0011] As one of the implementation manners, tension sleeves are respectively sleeved on the two hinge shafts, and the tension sleeves are provided with force arm rods and are connected to the corresponding transmission rollers through the force arm rods.

[0012] As one of the implementation manners, corresponding to the positions of the outer backing rollers, arc-shaped relief grooves are respectively provided at the top and bottom of the beam body.

[0013] The present invention further relates to a maintenance method for the above-mentioned spraying beam, including:

[0014] After connecting the upper spraying plate and the lower spraying plate into an integral body to keep the relative position between the two stable, then replace or maintain the relevant components, and the relevant components include at least one of the hinge shafts, the transmission structures connected to the hinge shafts, and the transmission rollers.

[0015] Furthermore, the upper spraying plate and the lower spraying plate are connected into an integral body through a holding plate; the holding plate is detachably connected to the two spraying plates respectively.

[0016] The present invention also relates to a twenty-high rolling mill, which includes a frame and a twenty-high roll train arranged on the frame. An emulsion injection beam is arranged on the inlet side and / or the outlet side of the frame. At least part of the emulsion injection beam adopts the above-mentioned injection beam, and the beam body is fixed on the frame.

[0017] The present invention also relates to a working method of the above-mentioned twenty-high rolling mill, including:

[0018] Under normal rolling conditions, emulsion is sprayed into the rolling deformation zone through the emulsion nozzles on the upper spraying plate and the emulsion nozzles on the lower spraying plate;

[0019] When it is necessary to repair and replace the lower working roll, the driving mechanism is used to drive the lower spraying plate to swing upward, and the strip steel is lifted by the lower spraying plate to obtain a larger maintenance operation space;

[0020] When it is necessary to repair and replace the upper working roll, the driving mechanism is used to drive the upper spraying plate to swing downward, and the strip steel is pressed down by the upper spraying plate to obtain a larger maintenance operation space.

[0021] The present invention has at least the following beneficial effects:

[0022] In the present invention, by using the same set of driving equipment, the upper spraying plate can be driven to swing downward while the lower spraying plate remains in place, and the lower spraying plate can be driven to swing upward while the upper spraying plate remains in place, or the two spraying plates can be driven to swing upward or downward synchronously by the same set of driving equipment, reducing the required driving equipment, thus effectively saving the equipment installation space and facilitating the normal and stable production of a compact twenty-high rolling mill, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic structural diagram of the twenty-high rolling mill provided by the embodiment of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the injection beam provided by the embodiment of the present invention;

[0026] Figure 3 It is a schematic transverse middle sectional view of the injection beam provided by the embodiment of the present invention;

[0027] Figure 4A schematic diagram of a longitudinal middle section of a spray beam provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1

[0030] like Figures 2 - 4 The embodiment of the present invention provides a spray beam 1, comprising a beam body 11, wherein a strip steel running channel is formed in the beam body 11, an upper spray plate 12 and a lower spray plate 13 are arranged at the front end of the beam body 11, the upper spray plate 12 and the lower spray plate 13 are arranged at the upper and lower sides of the strip steel running channel and are both provided with an emulsion nozzle 101, the upper spray plate 12 and the lower spray plate 13 are both hinged to the beam body 11 and the hinge axis is axially parallel to the width direction of the strip steel running channel; a driving mechanism is provided on the beam body 11, and the upper spray plate 12 and the lower spray plate 13 are both transmission-connected to the driving mechanism,

[0031] The driving mechanism is used to drive the upper injection plate 12 to swing downward while the lower injection plate 13 remains in place, and is used to drive the lower injection plate 13 to swing upward while the upper injection plate 12 remains in place;

[0032] Alternatively, the driving mechanism is used to drive the two injection plates to swing upward or downward synchronously.

[0033] In one embodiment, the above-mentioned beam body 11 includes an upper beam 111 and a lower beam 112. The upper beam 111 and the lower beam 112 are arranged at intervals up and down, and a strip running channel is formed therebetween. Further, the beam body 11 further includes two mounting plates 113. The two mounting plates 113 are respectively located on the transverse two sides of the strip running channel (that is, arranged along the width direction of the strip running channel). The plate surfaces of the two mounting plates 113 are preferably parallel to the vertical direction. The left end of the upper beam 111 and the left end of the lower beam 112 are both fixedly connected to the left mounting plate 113, and the right end of the upper beam 111 and the right end of the lower beam 112 are both fixedly connected to the right mounting plate 113. It can be seen that the two mounting plates 113 can connect the upper beam 111 and the lower beam 112 into one body. Preferably, both the upper beam 111 and the lower beam 112 are detachably connected to the mounting plates 113, which is convenient for equipment maintenance and repair. The two mounting plates 113, the upper beam 111 and the lower beam 112 can enclose a long and narrow flat-mouth type channel, and the strip 4 can pass through this flat-mouth type channel. When the above-mentioned spraying beam 1 is installed on the rolling mill stand 3, the upper beam 111 and the lower beam 112 can be fixedly connected to the stand 3, or fixedly connected to the stand 3 through the above-mentioned mounting plates 113. One of the mounting plates 113 is located on the operating side of the stand 3, and the other mounting plate 113 is located on the driving side of the stand 3.

[0034] Further preferably, the above-mentioned driving mechanism is installed on one of the mounting plates 113, for example, on the mounting plate 113 on the operating side of the stand 3, which is convenient for intuitively learning about the working condition of the driving mechanism and the equipment condition, and is convenient for the operator to intervene in time.

[0035] In one embodiment, as Figure 4 , a spraying mechanism is provided at the outer end of the beam body 11. On the one hand, it is used to prevent the emulsified liquid from flowing back. On the other hand, when the above-mentioned spraying beam 1 is used as the inlet spraying beam 1, the above-mentioned spraying mechanism can play the role of preheating the strip 4 and removing the original impurities on the strip surface. When the above-mentioned spraying beam 1 is used as the outlet spraying beam 1, the above-mentioned spraying mechanism can play the role of cooling the strip 4 and preventing the emulsified liquid from splashing out of the rolling mill. Preferably, spraying mechanisms are provided on both the upper beam 111 and the lower beam 112. The above-mentioned spraying mechanism includes multiple rows of spraying units. Each row of spraying units includes a plurality of channel nozzles 102 arranged in sequence along the width direction of the strip running channel. The multiple rows of spraying units are arranged in sequence along the strip running direction. In one embodiment, at least one row of spraying units sprays vertically onto the strip surface, and at least one row of spraying units sprays obliquely towards the work roll side onto the strip surface.

[0036] Furthermore, an emulsion input interface is provided at the outer end of the beam body 11 for connecting to the emulsion channel on the frame 3. Correspondingly, an emulsion channel can be formed within the beam body 11, and this emulsion channel is connected to the above-mentioned spraying mechanism. To prevent the residual emulsion in the upper beam 111 from dripping onto the strip surface irregularly when the emulsion is not being sprayed, a compressed air pipe is designed on the emulsion pipe externally connected to the frame 3 to blow away the residual emulsion with compressed air.

[0037] In one embodiment, when the above-mentioned spraying beam 1 is used in a twenty-high rolling mill, among the emulsion nozzles 101 on the upper spraying plate 12, a part sprays towards the rolling deformation zone, and another part sprays towards the roll gap between the work roll and the first intermediate roll; the emulsion nozzles 101 on the lower spraying plate 13 are arranged in the same way.

[0038] Preferably, emulsion channels are respectively formed within the upper spraying plate 12 and the lower spraying plate 13. Additionally, the upper side hinge shaft 141 (the hinge shaft to which the upper spraying plate 12 is connected) and the lower side hinge shaft 142 (the hinge shaft to which the lower spraying plate 13 is connected) are preferably hollow shafts, which can be used as emulsion channels to communicate with the emulsion channels within the corresponding spraying plates.

[0039] In one embodiment, as Figure 1 、 Figure 2 and Figure 4 , arc-shaped relief grooves are respectively provided at the top and bottom of the beam body 11. These arc-shaped relief grooves are mainly used to provide space for the replacement and maintenance of adjacent rolls, avoiding the need to disassemble and assemble the spraying beam 1 when replacing rolls, thereby improving the maintenance efficiency and the working stability of the spraying beam 1, and avoiding equipment damage caused by frequent disassembly and assembly of the spraying beam 1. When the above-mentioned spraying beam 1 is used in a twenty-high rolling mill, the positions of the above-mentioned arc-shaped relief grooves correspond to the positions of the outer backing rolls 2. Specifically, when the above-mentioned spraying beam 1 is installed on the frame 3, the top arc-shaped relief groove is located directly below the outer upper backing roll, and the bottom arc-shaped relief groove is located directly above the outer lower backing roll.

[0040] In this embodiment, by using the same set of driving equipment, the upper spraying plate 12 is driven to swing downward while the lower spraying plate 13 remains in place, and the lower spraying plate 13 is driven to swing upward while the upper spraying plate 12 remains in place, or the two spraying plates are driven to swing upward or downward synchronously by the same set of driving equipment, reducing the required driving equipment, thus effectively saving the equipment installation space and facilitating the normal and stable production of a compact twenty-high rolling mill, etc.

[0041] Optimize the above-mentioned spraying beam 1, such as Figure 2 and Figure 3The driving mechanism includes a limit plate 17 and a power unit 16 for driving the limit plate 17 to perform translational movement relative to the beam body 11; an upper limit groove 191 and a lower limit groove 192 are provided on the limit plate 17, and transmission rollers 18 are respectively provided in the two limit grooves, the upper transmission roller 18 in the upper limit groove 191 is transmission-connected to the upper hinge shaft 141, and the lower transmission roller 18 in the lower limit groove 192 is transmission-connected to the lower hinge shaft 142; the upper limit groove 191 and the lower limit groove 192 both have transmission sections 193, and the groove length direction of each transmission section 193 respectively has an angle with the translational direction of the limit plate 17, and the corresponding injection plate is driven to perform a swinging movement accordingly through the movement of the transmission roller 18 in the corresponding transmission section 193.

[0042] Among them, all driving devices that can realize the translation of the limit plate 17 are applicable to this embodiment, for example, the power unit 16 can be a cylinder, a hydraulic cylinder, an electric push rod or a motor + transmission mechanism, etc. Preferably, a slide rail is provided on the beam body 11, and the limit plate 17 is slidably provided on the slide rail, so that the translation of the limit plate 17 can be reliably guided and constrained.

[0043] The axis of the transmission roller 18 is parallel to the width direction of the strip running channel, that is, parallel to the axis of the upper hinge shaft 141 / lower hinge shaft 142. The transmission roller 18 is constrained in the corresponding limit groove, so it is preferred that the diameter of the transmission roller 18 matches (is the same as or similar to) the groove width of the limit groove.

[0044] In one embodiment, if Figure 2 , the two articulated shafts are respectively sleeved with tension sleeves 15, the tension sleeves 15 are provided with a lever arm 151 and are connected to the corresponding transmission roller 18 through the lever arm 151. The lever arm 151 and the transmission roller 18 are rotatably connected, for example, the lever arm 151 and the axle of the transmission roller 18 are hinged. The tension sleeve 15 can play a buffering role when the corresponding injection plate is impacted by external force, and better protect the equipment; the clamping force between the tension sleeve 15 and the articulated shaft can be set to achieve reliable protection effect and transmission effect.

[0045] Based on the translational movement of the limit plate 17, and there is an angle between the slot length direction of the transmission section 193 and the translational direction of the limit plate 17, when the transmission section 193 is moving, it can drive the transmission roller 18 to move along the transmission section 193, and the transmission roller 18 drives the corresponding injection plate to swing. The corresponding relationship between the inclination direction and inclination of the slot length direction of the transmission section 193 relative to the translational direction of the limit plate 17 can be designed accordingly to achieve the required injection plate swing direction and swing angle.

[0046] The main purpose of the upward swing of the upper injection plate 12 is to press down the strip steel 4 to facilitate the replacement and maintenance of the upper working roll and the like; the main purpose of the downward swing of the lower injection plate 13 is to lift the strip steel 4 to facilitate the replacement and maintenance of the lower working roll and the like. In this embodiment, preferably, the driving mechanism is used to drive the upper injection plate 12 to swing downward while the lower injection plate 13 remains in place, and to drive the lower injection plate 13 to swing upward while the upper injection plate 12 remains in place, with higher operation flexibility and avoiding unnecessary interference when the two injection plates swing upward or downward synchronously. For this reason, as Figure 2 shown, the upper limit slot 191 and the lower limit slot 192 both further have a guiding section 194, and the slot length direction of each guiding section 194 is parallel to the translation direction of the limit plate 17. Obviously, when the transmission roller 18 is located in the guiding section 194, the movement of the limit plate 17 will not cause the transmission roller 18 to displace, and the injection plate connected to the transmission roller 18 remains in place; the relative position relationship between the upper limit slot 191 and the lower limit slot 192 satisfies that when the upper transmission roller 18 moves in the transmission section 193 of the upper limit slot 191, the lower transmission roller 18 moves in the guiding section 194 of the lower limit slot 192; when the lower transmission roller 18 moves in the transmission section 193 of the lower limit slot 192, the upper transmission roller 18 moves in the guiding section 194 of the upper limit slot 191.

[0047] In one embodiment, as Figure 2 shown, the translation direction of the limit plate 17 is parallel to the strip steel running direction, that is, parallel to the length direction of the strip steel running channel. Then the slot length direction of the above-mentioned guiding section 194 is parallel to the strip steel running direction, and the slot length direction of the transmission section 193 has an included angle with the strip steel running direction; when the above-mentioned injection beam 1 is installed on the rack 3, the slot length direction of the guiding section 194 is parallel to the horizontal direction, and the slot length direction of the transmission section 193 is inclined relative to the horizontal plane. In the Figure 2 way shown, the transmission section 193 of the upper limit slot 191 is located on the side close to the working roll of its guiding section 194, and this transmission section 193 is inclined upward; the transmission section 193 of the lower limit slot 192 is located on the side far from the working roll of its guiding section 194, and this transmission section 193 is inclined downward; when the limit plate 17 translates in the direction away from the working roll, it can drive the upper injection plate 12 to swing downward, and the lower injection plate 13 remains unchanged and does not rotate during this process; when the limit plate 17 translates in the direction close to the working roll, it can drive the lower injection plate 13 to swing upward, and the upper injection plate 12 remains unchanged and does not rotate during this process. Of course, it is not limited to the above setting structure. For example, it is also feasible that there is an included angle between the translation direction of the limit plate 17 and the strip steel running direction, and the upper limit slot 191 and the lower limit slot 192 need to be adjusted accordingly, which will not be elaborated here.

[0048] Preferably, as Figure 2 , when the upper spraying plate 12 and the lower spraying plate 13 are in the spraying position (which is the normal working state of the upper spraying plate 12 and the lower spraying plate 13, mainly used for spraying emulsion), the two driving rollers 18 are respectively located at the junction of the driving section 193 and the guiding section 194 of the corresponding limiting groove; based on this design, the response speed of the swinging motion of the upper spraying plate 12 and the lower spraying plate 13 can be improved.

[0049] Furthermore, the groove length of the guiding section 194 of the upper limiting groove 191 should preferably not be less than the groove length of the driving section 193 of the lower limiting groove 192, and the groove length of the guiding section 194 of the lower limiting groove 192 should preferably not be less than the groove length of the driving section 193 of the upper limiting groove 191. In one embodiment, the groove lengths of the two guiding sections 194 and the groove lengths of the two driving sections 193 are the same. Obviously, by designing the groove length of the driving section 193, the swinging angles of the upper spraying plate 12 and the lower spraying plate 13 can be controlled.

[0050] The above structure is simple, ingeniously designed, convenient to operate and has high working reliability; the upper spraying plate 12 and the lower spraying plate 13 share a set of drives, saving equipment installation space and equipment cost, with a compact structure and a simple drive composition, and being easy to maintain and manage.

[0051] Embodiment 2

[0052] The embodiment of the present invention relates to a maintenance method of the spraying beam 1 provided in the above Embodiment 1, including:

[0053] After connecting the upper spraying plate 12 and the lower spraying plate 13 into one body to keep the relative positions between them stable, then replace or maintain the relevant components, and the relevant components include at least one of the hinge shaft, the transmission structure connected by the hinge shaft, and the driving roller 18.

[0054] Based on the above solution, it is more convenient to replace the equipment parts of the spraying beam 1, and it is not necessary to re-measure the relative installation angle between the force arm rod 151 and the spraying plate every time for maintenance, which can significantly improve the maintenance efficiency and the working stability of the spraying beam 1.

[0055] In one embodiment, as Figure 1 and Figure 2, the upper spraying plate 12 and the lower spraying plate 13 are integrated by the holding plate 100; the holding plate 100 is detachably connected to the two spraying plates respectively; correspondingly, holding connection parts are respectively arranged on the upper spraying plate 12 and the lower spraying plate 13, and the holding connection part can be a bolt connection hole or a clamping mechanism suitable for clamping the holding plate 100, etc. Among them, the holding plate 100 can be disassembled and assembled only on the operation side of the unit, and the operation convenience is better. During normal production, the holding plate 100 can be removed. At this time, the upper spraying plate 12 / the lower spraying plate 13 can be driven to swing according to specific conditions, such as maintaining the work roll or adjusting the emulsified liquid spraying angle, etc.

[0056] Embodiment III

[0057] As Figure 1 , an embodiment of the present invention provides a twenty-high rolling mill, including a frame 3 and a twenty-high roll train arranged on the frame 3. An emulsified liquid spraying beam 1 is arranged on the inlet side and / or the outlet side of the frame 3. At least part of the emulsified liquid spraying beam 1 adopts the spraying beam 1 provided in the first embodiment above, and the beam body 11 is fixed on the frame 3.

[0058] Among them, it is preferably that the spraying beams 1 provided in the first embodiment above are arranged on both the inlet side and the outlet side of the frame 3.

[0059] This embodiment also relates to a working method of the above twenty-high rolling mill, including:

[0060] Under normal rolling conditions, emulsified liquid is sprayed into the rolling deformation zone through the emulsified liquid nozzles 101 on the upper spraying plate 12 and the emulsified liquid nozzles 101 on the lower spraying plate 13;

[0061] When it is necessary to repair and replace the lower work roll, the lower spraying plate 13 is driven to swing upward through the driving mechanism, and the strip steel 4 is lifted by the lower spraying plate 13 to obtain a larger maintenance operation space;

[0062] When it is necessary to repair and replace the upper work roll, the upper spraying plate 12 is driven to swing downward through the driving mechanism, and the strip steel 4 is pressed down by the upper spraying plate 12 to obtain a larger maintenance operation space.

[0063] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A spray beam, Features: The invention comprises a beam body, wherein a strip steel running channel is formed in the beam body, an upper injection plate and a lower injection plate are arranged at the front end of the beam body, the upper injection plate and the lower injection plate are arranged at the upper and lower sides of the strip steel running channel and are both provided with emulsion nozzles, the upper injection plate and the lower injection plate are both hinged to the beam body, and the hinge axis is axially parallel to the width direction of the strip steel running channel; a driving mechanism is arranged on the beam body, the upper injection plate and the lower injection plate are both transmission-connected to the driving mechanism, the driving mechanism is used to drive the upper injection plate to swing downward to press down the strip steel while the lower injection plate remains in place, and is used to drive the lower injection plate to swing upward to lift up the strip steel while the upper injection plate remains in place; A spray mechanism is provided at the outer end of the beam body, the spray mechanism is used to prevent the emulsion from flowing back, and when the spray beam is used as an inlet spray beam, the spray mechanism is also used to preheat the strip and remove the original impurities on the surface of the strip, and when the spray beam is used as an outlet spray beam, the spray mechanism is also used to cool the strip and prevent the emulsion from splashing out of the rolling mill; the spray mechanism includes multiple rows of spray units, each row of spray units includes multiple channel nozzles arranged in sequence along the width direction of the strip running channel, the multiple rows of spray units are arranged in sequence along the running direction of the strip, at least one row of spray units sprays vertically to the strip surface, and at least one row of spray units sprays obliquely to the working roll side to the strip surface; The driving mechanism includes a limit plate and a power unit for driving the limit plate to perform translational movement relative to the beam body; an upper limit slot and a lower limit slot are provided on the limit plate, and transmission rollers are respectively provided in the two limit slots, the upper transmission roller in the upper limit slot is transmission-connected to the upper articulated shaft, and the lower transmission roller in the lower limit slot is transmission-connected to the lower articulated shaft; the upper limit slot and the lower limit slot both have transmission sections, and the slot length direction of each transmission section has an angle with the translational direction of the limit plate, and the corresponding ejection plate is driven to perform a swinging movement accordingly through the movement of the transmission roller in the corresponding transmission section; The upper limit slot and the lower limit slot both further have a guide segment, and the slot length direction of each guide segment is parallel to the translation direction of the limit plate; the relative position relationship between the upper limit slot and the lower limit slot satisfies: When the upper transmission roller moves in the transmission section in the upper limit slot, the lower transmission roller moves in the guide section in the lower limit slot; when the lower transmission roller moves in the transmission section in the lower limit slot, the upper transmission roller moves in the guide section in the upper limit slot.

2. The spray beam according to claim 1, Features: When the upper injection plate and the lower injection plate are in the injection position, the two transmission rollers are respectively located at the intersection of the transmission section and the guide section of the corresponding limiting groove.

3. The spray beam according to claim 1, Features: A tension sleeve is sleeved on each of the two hinged shafts. The tension sleeve has a lever arm and is connected to a corresponding transmission roller via the lever arm.

4. The spray beam according to claim 1, Features: Corresponding to the position of the outer backing roll, arc-shaped relief grooves are respectively provided at the top and bottom of the beam body.

5. The maintenance method of the injection beam according to any one of claims 1 to 4, characterized in that: After connecting the upper injection plate and the lower injection plate into one body to keep the relative position between them stable, then replace or maintain the relevant components, and the relevant components include at least one of the hinge shaft, the transmission structure connected by the hinge shaft, and the transmission roller.

6. The maintenance method according to claim 5, characterized in that: The upper injection plate and the lower injection plate are connected into one body through a holding plate; the holding plate is detachably connected to the two injection plates respectively.

7. A twenty-high rolling mill, comprising a frame and a twenty-high roll train arranged on the frame, and an emulsion injection beam is arranged on the inlet side and / or the outlet side of the frame, characterized in that: At least part of the emulsion injection beam adopts the injection beam according to any one of claims 1 to 4, and the beam body is fixed on the frame.

8. The working method of the twenty-high rolling mill according to claim 7, characterized in that: Under normal rolling conditions, emulsion is sprayed into the rolling deformation zone through the emulsion nozzles on the upper injection plate and the emulsion nozzles on the lower injection plate; When it is necessary to repair and replace the lower working roll, the lower injection plate is driven to swing upward through the driving mechanism, and the strip steel is lifted by the lower injection plate to obtain a larger maintenance operation space; When it is necessary to repair and replace the upper working roll, the upper injection plate is driven to swing downward through the driving mechanism, and the strip steel is pressed down by the upper injection plate to obtain a larger maintenance operation space.

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