Rolling mill step block cleaning device

Abstract

The utility model provides a rolling mill step block cleaning device which comprises a supporting roller assembly, the supporting roller assembly comprises a supporting roller and two bearing seats, the rolling mill step block cleaning device further comprises a height adjusting mechanism and a cleaning mechanism, and the height adjusting mechanism comprises a base, two sets of step blocks and four pushing mechanisms. The pushing mechanisms are telescopically arranged in the vertical direction and fixed to the base, the bottoms of the two transverse ends of each bearing seat are each connected with one pushing mechanism, the step blocks are slidably arranged on the base in the longitudinal direction, a set of step blocks are correspondingly arranged at the bottom of each bearing seat, and the cleaning mechanism comprises two cleaning assemblies. Each cleaning assembly comprises a transverse pipe and a plurality of nozzles, the transverse pipes are connected to the bottoms of the bearing seats, and the nozzles are distributed on the transverse pipes. In this way, the internal step block can be cleaned without disassembling the rolling mill supporting roller, so that the step block is free of foreign matter deposition, the raising control precision is guaranteed, and the product quality is guaranteed; therefore, the service life of equipment can be prolonged, and the later maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of rolling mill equipment, in particular to a rolling mill step block cleaning device. Background Art

[0002] The rolling line elevation of the rolling mill frame must be maintained within a certain range (between 945mm and 930mm). In order to ensure this range, the wear of the working rolls and support rolls needs to be compensated. The appropriate height can be selected by setting a step block under the lower support roll bearing seat.

[0003] The height of the lower support roller is installed in the frame through step blocks of different thicknesses. The lower support roller and the bearing seat are lifted by the lower support roller lifting cylinder, and the step block frame with the required thickness is padded to the corresponding position to obtain the rolling line height set for this frame.

[0004] Although the step blocks in the prior art are protected by protective covers, as the use time accumulates, foreign matter will be deposited on the step blocks inside, which will affect the actual elevation of the rolling line. If it is not dealt with for a long time, it will directly affect the rolling accuracy and product size accuracy, and even cause production accidents. The process of directly disassembling it for cleaning is more troublesome, time-consuming and labor-intensive. If the assembly is not accurate, it will also affect the rolling line elevation.

[0005] In view of this, it is necessary to propose a rolling mill step block cleaning device to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0006] The main purpose of the utility model is to provide a rolling mill step block cleaning device to solve the problem in the prior art that foreign matter will be deposited inside the step block after long-term use and affect the actual elevation of the rolling line.

[0007] To achieve the above-mentioned purpose, the utility model provides a rolling mill step block cleaning device, comprising a support roller assembly, wherein the support roller assembly comprises a support roller and two bearing seats arranged opposite to each other in the longitudinal direction, wherein the support roller is rotatably connected to the two bearing seats, and further comprises a height adjustment mechanism and a cleaning mechanism; wherein,

[0008] The height adjustment mechanism comprises a base, two groups of step blocks spaced apart in the longitudinal direction, and four pushing mechanisms distributed in a matrix shape. The pushing mechanisms are telescopically arranged and fixed on the base in the vertical direction, and each of the bottom ends of the bearing seat in the horizontal direction is connected to a pushing mechanism; the step blocks are slidably arranged on the base in the longitudinal direction, and a group of step blocks is correspondingly arranged at the bottom of each bearing seat;

[0009] The cleaning mechanism includes two cleaning components arranged opposite to each other in the longitudinal direction, each of the cleaning components includes a transverse tube and a plurality of nozzles, the transverse tube is connected to the bottom of the bearing seat, the two ends of the transverse tube are used to communicate with an external water outlet system, and the plurality of nozzles are arranged on the transverse tube at intervals in the transverse direction and are connected to the transverse tube.

[0010] Preferably, each of the cleaning components further comprises a pipe clamp, wherein the pipe clamp is connected to a side of the bottom of the bearing seat away from the supporting roller, and the transverse tube is rotatably connected to the pipe clamp.

[0011] Preferably, each of the cleaning components further comprises two protective side covers which are arranged opposite to each other in the longitudinal direction, and both ends of the bearing seat are provided with ear plates which protrude outward in the longitudinal direction, and the protective side covers are rotatably connected to the ear plates.

[0012] Preferably, the height adjustment mechanism further includes a moving cylinder and a connecting block, wherein the connecting block is connected between two groups of the step blocks, the moving cylinder is fixed on the base, and a driving end of the moving cylinder is connected to the step block.

[0013] Preferably, the cleaning mechanism further comprises a protective cover, which is arranged on the base, and the protective cover is arranged on the outer side of the bearing seat and between the two bearing seats.

[0014] Preferably, each of the pushing mechanisms comprises a pushing support and two pushing cylinders spaced apart in the longitudinal direction, the bottom end of the bearing seat is fixed to the top of the pushing cylinder, and the pushing cylinder is telescopically arranged in the vertical direction.

[0015] Preferably, the nozzle is arranged to be inclined downwardly of the supporting roller.

[0016] Preferably, the support roller assembly further comprises a push plate, which is fixed to the bottom of the bearing seat and is arranged between the bearing seat and the step block.

[0017] Preferably, the number of the nozzles is eight, and the eight nozzles are arranged on the transverse tube at intervals in the transverse direction.

[0018] Preferably, the inclination angle of the nozzle is 20° to 25°.

[0019] Compared with the prior art, the utility model provides the following beneficial effects:

[0020] The utility model provides a mill step block cleaning device, including a support roller assembly, the support roller assembly including a support roller and two bearing seats, and also including a height adjustment mechanism and a cleaning mechanism, the height adjustment mechanism including a base, two groups of step blocks and four push mechanisms, the push mechanism is arranged telescopically and fixed on the base in the vertical direction, each bearing seat is connected to a push mechanism at both ends of the bottom in the horizontal direction, the step block is slidably arranged on the base in the longitudinal direction, and each bearing seat bottom is correspondingly provided with a group of step blocks, the cleaning mechanism includes two cleaning components arranged oppositely in the longitudinal direction, each cleaning component includes a transverse tube and a plurality of nozzles, the transverse tube is connected to the bottom of the bearing seat, the two ends of the transverse tube are used to communicate with the external water outlet system, and the plurality of nozzles are arranged on the transverse tube at intervals in the horizontal direction and are connected to the transverse tube. In this way, the internal step block can be cleaned without disassembling the mill support roller, so that the step block has no foreign matter deposition, thereby ensuring the height control accuracy and product quality; in this way, the service life of the equipment can be extended and the later maintenance cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 It is a three-dimensional schematic diagram of the overall structure of one embodiment of the utility model after removing the protective cover and a bearing seat;

[0023] Figure 2 It is a three-dimensional schematic diagram of the overall structure of one embodiment of the utility model after removing the protective cover;

[0024] Figure 3 for Figure 2 Schematic elevation diagram of

[0025] Figure 4 It is a three-dimensional schematic diagram of the overall structure in one embodiment of the utility model;

[0026] Figure 5 for Figure 1 Schematic elevation diagram of .

[0027] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0028] Description of Figure Numbers:

[0029] 10. Height adjustment mechanism; 110. Base; 120. Step block; 130. Push mechanism; 131. Push support; 132. Push cylinder; 140. Sliding cylinder; 150. Connecting block; 20. Cleaning mechanism; 210. Cleaning assembly; 211. Cross pipe; 212. Nozzle; 213. Pipe clamp; 214. Protective side cover; 220. Protective cover; 30. Support roller assembly; 310. Support roller; 320. Bearing seat; 330. Push plate. DETAILED DESCRIPTION

[0030] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0034] Please see attached Figure 1-5In one embodiment of the utility model, a rolling mill step block cleaning device includes a support roller assembly, wherein the support roller assembly includes a support roller and two bearing seats arranged opposite to each other in the longitudinal direction, wherein the support roller is rotatably connected to the two bearing seats, and further includes a height adjustment mechanism and a cleaning mechanism. First of all, it should be noted that the longitudinal direction in the present application refers to the length extension direction along the base, while the transverse direction refers to the width direction along the base; and unlike the step blocks in the prior art, although they are protected by protective covers, as the use time accumulates, foreign matter will also be deposited on the step blocks located inside, which will affect the actual elevation of the rolling line. If it is not handled for a long time, it will directly affect the rolling accuracy and product dimensional accuracy, and even cause production accidents; and the process of directly disassembling it for cleaning is more troublesome, time-consuming and labor-intensive, and if the assembly is not accurate, it will also affect the rolling line elevation. The present application solves the above-mentioned defects in the prior art by providing a rolling mill step block cleaning device. The details are as follows:

[0035] The height adjustment mechanism 10 includes a base 110, two groups of step blocks 120 arranged at intervals along the longitudinal direction, and four pushing mechanisms 130 distributed in a matrix shape. The pushing mechanisms 130 are arranged telescopically in the vertical direction and fixed on the base 110, and each of the two ends of the bearing seat 320 is connected to a pushing mechanism 130 at the bottom of the two ends in the horizontal direction; the step blocks 120 are slidably arranged on the base 110 in the longitudinal direction, and a group of step blocks 120 are correspondingly arranged at the bottom of each bearing seat 320; the cleaning mechanism 20 includes two cleaning components 210 arranged opposite to each other in the longitudinal direction, each of the cleaning components 210 includes a transverse tube 211 and a plurality of nozzles 212, the transverse tube 211 is connected to the bottom of the bearing seat 320, and the two ends of the transverse tube 211 are used to communicate with an external water outlet system, and the plurality of nozzles 212 are arranged on the transverse tube 211 at intervals in the horizontal direction and are connected to the transverse tube 211.

[0036] Specifically, the support roller assembly 30 includes a support roller 310 and two bearing seats 320 arranged opposite to each other in the longitudinal direction. It is a production working component of the rolling mill, and also includes a height adjustment mechanism 10 and a cleaning mechanism 20. The height adjustment mechanism 10 is used to compensate for the wear of the support roller assembly 30. The height adjustment mechanism 10 is padded to achieve the actual elevation of the rolling line that meets the requirements. However, as the use time accumulates, foreign matter will be deposited in the height adjustment mechanism 10. Therefore, it is necessary to add the cleaning mechanism 20 to clean the height adjustment mechanism 10, so as to ensure the rolling accuracy during padding and ensure the product size accuracy.

[0037] The height adjustment mechanism 10 includes a base 110, two groups of step blocks 120 and four pushing mechanisms 130. The base 110 is used for installing the step blocks 120 and the pushing mechanisms 130. Since the support roller assembly 30 includes two bearing seats 320, two groups of step blocks 120 spaced apart in the longitudinal direction are also required in consideration of the consistent pad height, so that a group of step blocks 120 are arranged under each bearing seat 320. The step blocks 120 are slidably arranged on the base 110 in the longitudinal direction. When a certain standard height is required, the step blocks 120 can be slid to the target position to meet the required standard height. The pushing mechanism 130 is used to lift the support roller assembly 30, so as to facilitate adjustment of different padding positions of the step block 120 to form different padding heights. At the same time, after the support roller assembly 30 is lifted up, a sufficient height cleaning space is formed, which is also more convenient for cleaning the step block 120. Therefore, in order to ensure that the entire support roller assembly 30 remains balanced during lifting, the four pushing mechanisms 130 are distributed in a matrix shape, so that each of the two ends of the bearing seat 320 (the two bearing seats 320 are four bottom parts) is correspondingly connected to a pushing mechanism 130. When lifting, the four pushing mechanisms 130 synchronously lift the support roller assembly 30 to avoid structural damage.

[0038] Furthermore, the cleaning mechanism 20 includes two cleaning components 210, and the two cleaning components 210 are used to clean two groups of spaced step blocks 120 respectively, and the two cleaning components 210 are arranged relative to each other in the longitudinal direction to achieve cleaning of the step blocks 120 at different angles, thereby ensuring a better cleaning effect; wherein each of the cleaning components 210 includes a transverse tube 211 and a plurality of nozzles 212, and the transverse tube 211 is used for installing the nozzles 212, so that the plurality of nozzles 212 are arranged in the transverse direction on the transverse tube 211 at intervals. 1 and connected with the transverse pipe 211, and both ends of the transverse pipe 211 are used to communicate with an external water outlet system, where the external water outlet system can use a rolling mill high-pressure water system as a water source, so that after the support roller assemblies 30 are all jacked up to a sufficient height (the step blocks 120 can slide freely in the longitudinal direction without being stopped), the water valve is opened to let the water source into the transverse pipe 211, and the water is sprayed from the nozzle 212 to clean the step blocks 120. During the cleaning process, the step blocks 120 can be moved to ensure that each position can be cleaned smoothly.

[0039] As a preferred embodiment of the present invention, each cleaning assembly 210 further includes a tube clamp 213 , which is connected to the bottom of the bearing seat 320 on a side away from the support roller 310 , and the transverse tube 211 is rotatably connected to the tube clamp 213 .

[0040] It should be noted that the tube clamp 213 is used for installing the cross tube 211 to clamp the cross tube 211. It is arranged on the side of the bottom of the bearing seat 320 away from the support roller 310 (i.e., the outside of the bearing seat 320). When the cross tube 211 is arranged in the tube clamp 213, since the two cleaning components 210 are arranged relative to each other, the nozzle 212 is also arranged relative to each other. When the step block 120 passes under the support roller 310, it can withstand two cleaning purges at different angles to further ensure the cleaning effect; preferably, the cross tube 211 is rotatably connected to the tube clamp 213, so that technicians in this field can freely adjust the spraying angle of the nozzle 212 as needed.

[0041] As a preferred embodiment of the utility model, each of the cleaning components 210 also includes two protective side covers 214 arranged opposite to each other in the longitudinal direction, and both ends of the bearing seat 320 are protruded outward in the longitudinal direction to form ear plates, and the protective side covers 214 are rotatably connected to the ear plates.

[0042] It should be noted that the protective side cover 214 is used to prevent dust from entering from both sides of the bearing seat 320, and can also protect the cross pipe 211 and the nozzle 212. In order to facilitate the installation of the protective side cover 214, ear plates are formed at both ends of the bearing seat 320 protruding outward in the longitudinal direction. The ear plates facilitate the rotatable installation of the protective side cover 214, so that when it is necessary to adjust the angle of the nozzle 212 and rotate the cross pipe 211, the protective side cover 214 can be rotated to an open state for easy operation.

[0043] As a preferred embodiment of the utility model, the height adjustment mechanism 10 also includes a movable cylinder 140 and a connecting block 150, the connecting block 150 is connected between the two groups of the step blocks 120, the movable cylinder 140 is fixed on the base 110, and the driving end of the movable cylinder 140 is connected to the step block 120.

[0044] It is worth mentioning that the shifting cylinder 140 is used as a power source to drive the step block 120 to slide, and the connecting block 150 is used to connect two groups of step blocks 120 arranged at intervals, so as to facilitate synchronous adjustment through one shifting cylinder 140 to ensure that the two bearing seats 320 are raised and leveled to the same degree. In this way, the shifting cylinder 140 is installed at one end of the base 110, and its driving end is connected to the step block 120, so that when the connected step block 120 is driven to move, the other group of step blocks 120 connected by the connecting block 150 can move together.

[0045] As a preferred embodiment of the present invention, the cleaning mechanism 20 further includes a protective cover 220 , which is disposed on the base 110 , and the protective cover 220 is disposed on the outer side of the bearing seat 320 and between the two bearing seats 320 .

[0046] It is worth noting that the protective cover 220 prevents dust from falling into the step blocks 120 and the movable cylinder 140 on the base 110. The cover is arranged on the base 110. When the cover is arranged on the outer side of one end of the bearing seat 320, it can protect the movable cylinder 140. When the cover is arranged on the outer side of the other end of the bearing seat 320 and between the two bearing seats 320, it can be used to protect the step blocks 120. Therefore, the protective cover 220 is arranged on the outer side of the bearing seat 320 and between the two bearing seats 320, so as to provide better protection for the entire base 110.

[0047] Furthermore, each of the pushing mechanisms 130 includes a pushing support 131 and two pushing cylinders 132 spaced apart in the longitudinal direction. The bottom end of the bearing seat 320 is fixed to the top of the pushing cylinder 132, and the pushing cylinder 132 is telescopically arranged in the vertical direction.

[0048] It should be noted that the pushing support 131 is used for the installation of the pushing cylinder 132, and the pushing cylinder 132 serves as a power source for lifting the bearing seat 320, and is vertically telescopically arranged, wherein each of the pushing supports 131 is installed with two pushing cylinders 132 arranged at intervals along the longitudinal direction to ensure that the pushing force on the bearing seat 320 is evenly distributed, and the number of the pushing cylinders 132 can be determined according to the longitudinal width of the bearing seat 320.

[0049] Furthermore, the nozzle 212 is disposed obliquely toward the bottom of the supporting roller 310 .

[0050] It should be understood that since the two transverse tubes 211 are relatively connected to the bottom of the bearing seat 320 away from the side of the support roller 310, the two nozzles 212 both spray obliquely toward the bottom of the support roller 310 to ensure that the step block 120 moving past is sprayed with cleaning at two different angles, thereby further ensuring the cleaning effect.

[0051] Furthermore, the support roller assembly 30 also includes a push plate 330 , which is fixed to the bottom of the bearing seat 320 and is disposed between the bearing seat 320 and the step block 120 .

[0052] It should be noted that the push plate 330 is used as a support body between the bearing seat 320 and the step block 120, and is T-shaped to evenly distribute the force and avoid the bearing seat 320 pressing on the step block 120 to damage the step block 120; wherein, the push plate 330 is fixed to the bottom of the bearing seat 320, so that when the step block 120 is moved, the push plate 330 can follow the bearing seat 320 to push to a certain height, thereby avoiding blocking the displacement path of the step block 120.

[0053] Furthermore, the number of the nozzles 212 is eight, and the eight nozzles 212 are arranged on the transverse pipe 211 at intervals in the transverse direction.

[0054] It should be noted that the more the number of the nozzles 212 is, the larger the range of the cleaning spray is, which can be determined according to the width of the step block 120 and the spacing distance between two adjacent nozzles 212. In the present application as a preferred embodiment, the number of the nozzles 212 is eight, and the eight nozzles 212 are arranged on the horizontal tube 211 at intervals along the horizontal direction.

[0055] Furthermore, the inclination angle of the nozzle 212 is 20° to 25°.

[0056] It can be understood that the inclination angle of the nozzle 212 refers to the angle between the axis line of the nozzle 212 and the horizontal line. In order to ensure a better cleaning effect, it can be determined in combination with the slope of the step block 120 and the height at which the entire support roller assembly 30 is lifted. Preferably, the inclination angle of the nozzle 212 can be set to 20°~25°, and technical personnel in this field can set it according to actual conditions.

[0057] To facilitate understanding by those skilled in the art, the workflow in a preferred embodiment is briefly described as follows:

[0058] First, pipelines are led from the high-pressure water system of the rolling mill to appropriate positions near the support roller assembly 30, and then the two sides of the cross pipe 211 are connected with hoses. The length of the hose can be slightly greater than its linear distance to buffer the impact caused by the high-pressure water switch, and the pipe laying work is completed; the eight push cylinders 132 are driven synchronously to lift the support roller assembly 30 (bearing seat 320 and support roller 310), so that the push plate 330 reaches a certain height as the support roller assembly 30 (bearing seat 320 and support roller 310) is separated from the step block 120, and then sufficient cleaning space and a movement range of the step block 120 are formed; open the protective cover 220, and then the high-pressure water spray can be turned on. During the process, the movement cylinder 140 can be driven to move the step block 120 to achieve all-round cleaning. After the cleaning is completed, the step block 120 is restored to the preset position, and the lifted support roller assembly 30 (bearing seat 320 and support roller 310) is lowered and restored.

[0059] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A rolling mill step block cleaning device, comprising a support roller assembly, wherein the support roller assembly comprises a support roller and two bearing seats arranged opposite to each other in the longitudinal direction, wherein the support roller is rotatably connected to the two bearing seats, and wherein: It also includes a height adjustment mechanism and a cleaning mechanism; wherein, The height adjustment mechanism comprises a base, two groups of step blocks spaced apart in the longitudinal direction, and four pushing mechanisms distributed in a matrix shape. The pushing mechanisms are telescopically arranged and fixed on the base in the vertical direction, and each of the bottom ends of the bearing seat in the horizontal direction is connected to a pushing mechanism; the step blocks are slidably arranged on the base in the longitudinal direction, and a group of step blocks is correspondingly arranged at the bottom of each bearing seat; The cleaning mechanism includes two cleaning components arranged opposite to each other in the longitudinal direction, each of the cleaning components includes a transverse tube and a plurality of nozzles, the transverse tube is connected to the bottom of the bearing seat, the two ends of the transverse tube are used to communicate with an external water outlet system, and the plurality of nozzles are arranged on the transverse tube at intervals in the transverse direction and are connected to the transverse tube.

2. The rolling mill step block cleaning device according to claim 1, characterized in that: Each of the cleaning components further comprises a pipe clamp, which is connected to a side of the bottom of the bearing seat away from the supporting roller, and the transverse tube is rotatably connected to the pipe clamp.

3. The rolling mill step block cleaning device according to claim 1, characterized in that: Each of the cleaning components further comprises two protective side covers arranged opposite to each other in the longitudinal direction. Both ends of the bearing seat are provided with ear plates protruding outward in the longitudinal direction. The protective side covers are rotatably connected to the ear plates.

4. The rolling mill step block cleaning device according to claim 1, characterized in that: The height adjustment mechanism also includes a moving oil cylinder and a connecting block, wherein the connecting block is connected between two groups of the step blocks, the moving oil cylinder is fixed on the base, and the driving end of the moving oil cylinder is connected to the step block.

5. The rolling mill step block cleaning device according to claim 1, characterized in that: The cleaning mechanism also includes a protective cover, which is arranged on the base. The protective cover is arranged on the outer side of the bearing seat and between the two bearing seats.

6. The rolling mill step block cleaning device according to claim 1, characterized in that: Each of the pushing mechanisms comprises a pushing support and two pushing cylinders spaced apart in the longitudinal direction. The bottom end of the bearing seat is fixed to the top of the pushing cylinder, and the pushing cylinder is telescopically arranged in the vertical direction.

7. The rolling mill step block cleaning device according to claim 2, characterized in that: The nozzle is arranged to be inclined downwardly of the supporting roller.

8. The rolling mill step block cleaning device according to claim 1, characterized in that: The support roller assembly also includes a push plate, which is fixed to the bottom of the bearing seat and is arranged between the bearing seat and the step block.

9. The rolling mill step block cleaning device according to claim 7, characterized in that: The number of the nozzles is eight, and the eight nozzles are arranged on the transverse pipe at intervals in the transverse direction.

10. The rolling mill step block cleaning device according to claim 7, characterized in that: The inclination angle of the nozzle is 20° to 25°.

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