Multi-pass roller cooling water circulation device

Abstract

The invention relates to the technical field of metallurgical steel rolling, in particular to a multi-pass roller cooling water circulation device which not only accelerates cooling of cooling water and ensures the cooling effect of the cooling water by arranging a heat dissipation water tank and an exhaust fan, but also can filter backflow cooling water to prevent impurities from being accumulated in a pipeline to influence water circulation. Comprising a roller machine; the cooling device comprises a roller machine and further comprises a water supply mechanism, a filtering mechanism, a feedback mechanism, a heat dissipation mechanism and a spraying mechanism, the water supply mechanism is installed on the roller machine and conveys cooling water into the roller machine, the filtering mechanism is installed on the roller machine and filters the cooling water, and the feedback mechanism is installed on the filtering mechanism and conveys the cooling water back into the water supply mechanism. The heat dissipation mechanism is installed on the roller machine and accelerates cooling of cooling water in the water supply mechanism, and the spraying mechanism is installed on the water supply mechanism and enhances the cooling effect on the roller.

Description

Technical Field

[0001] This invention relates to the technical field of metallurgical steel rolling, and in particular to a multi-pass roll cooling water circulation device. Background Technology

[0002] During the steel rolling process, the rolls are subjected to enormous rolling forces and frictional heat, causing their temperature to rise rapidly. To prevent the rolls from overheating and deforming, reduce roll wear, and ensure rolling accuracy and plate shape quality, effective cooling of the rolls is essential.

[0003] Existing multi-pass rolling mill cooling water circulation devices, such as the aluminum plate casting and rolling mill cooling water circulation device disclosed in invention patent application number 201220238792.2, mainly include an aluminum plate casting and rolling mill, on which two hollow casting and rolling rolls are arranged in opposite directions. One end of each hollow casting and rolling roll is connected to a cooling water inlet pipe. During use, the two hollow casting and rolling rolls become extremely hot due to the heat conduction of the aluminum plate. In order to continuously and normally cast and roll aluminum plates, it is necessary to cool the two hollow casting and rolling rolls with water. The water tank provides cooling water and cools the returning hot water, forming a cooling water circulation system.

[0004] However, the return water temperature in existing cooling water circulation devices is relatively high, making it difficult to cool down in a short time, which affects the circulation effect. Moreover, impurities accumulate in the cooling water during circulation, which may cause blockage and affect the water circulation effect. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a multi-pass roll cooling water circulation device that not only accelerates the cooling water cooling and ensures the cooling effect by setting up a heat dissipation water tank and an exhaust fan, but also filters the return cooling water to prevent impurities from accumulating in the pipes and affecting the water circulation.

[0006] This invention discloses a multi-pass roll cooling water circulation device, comprising a roll mill; and further comprising a water supply mechanism, a filtration mechanism, a return mechanism, a heat dissipation mechanism, and a spraying mechanism. The water supply mechanism is installed on the roll mill and supplies cooling water into the roll mill. The filtration mechanism is installed on the roll mill and filters the cooling water. The return mechanism is installed on the filtration mechanism and returns the cooling water to the water supply mechanism. The heat dissipation mechanism is installed on the roll mill and accelerates the cooling of the cooling water in the water supply mechanism. The spraying mechanism is installed on the water supply mechanism and enhances the cooling effect on the rolls. The return mechanism is activated to supply cooling water to the water supply mechanism, which in turn supplies cooling water into the roll mill to cool the rolls. Simultaneously, the spraying mechanism sprays cooling water onto the rolls to enhance the cooling effect. After passing through the roll mill, the cooling water enters the filtration mechanism for filtration. The filtered cooling water then circulates back into the water supply mechanism. The heat dissipation mechanism is activated to accelerate the airflow around the water supply mechanism, thereby accelerating the cooling of the cooling water.

[0007] Furthermore, the rolling mill includes a worktable, multiple sets of rolling mills, multiple sets of connecting sleeves, and a drainage hopper. The bottom end of the worktable is connected to the ground. Multiple sets of rolling mills are rotatably mounted on the worktable. The interior of the multiple sets of rolling mills is hollow. Connecting sleeves are rotatably installed at both ends of each set of rolling mills. The drainage hopper is installed on the worktable. The water supply mechanism delivers cooling water to the rolling mills through the connecting sleeves. The cooling water cools the multiple sets of rolling mills. The cooling water is delivered to the filtration mechanism through the connecting sleeve at the other end and discharged. The water sprayed by the spraying mechanism is collected through the drainage hopper and enters the filtration mechanism.

[0008] Furthermore, the water supply mechanism includes a cooling water tank, a first water pump, a first pumping pipe, a thermometer, and a water supply pipe assembly. The cooling water tank is installed on the workbench, the first water pump is installed on the workbench, the first pumping pipe is connected between the cooling water tank and the first water pump, the thermometer is installed on the first pumping pipe, and the water supply pipe assembly is connected between the first water pump and multiple sets of connecting sleeves. The cooling water tank stores cooling water. When the first water pump is started, it draws the cooling water from the cooling water tank through the first pumping pipe. The thermometer detects the temperature of the cooling water to ensure the cooling effect of the cooling water on the rolls. The cooling water is delivered to the multiple sets of rolls through the water supply pipe assembly and connecting sleeves.

[0009] Furthermore, the filtration mechanism includes two sets of return pipe assemblies, two sets of pressure gauges, a drain pipe, and a filter box. Both sets of return pipe assemblies are connected to the interior of multiple connecting sleeves. The two sets of pressure gauges are respectively installed on the two sets of return pipe assemblies. The top of the drain pipe is connected to the interior of the bottom of the drain hopper, and the drain pipe is also connected to the interior of the two sets of return pipe assemblies. The top of the filter box is connected to the interior of the bottom of the drain pipe. Cooling water from the multiple sets of rolls is transported to the two sets of return pipe assemblies through the connecting sleeves. The two sets of pressure gauges detect the water pressure in the two sets of return pipe assemblies to facilitate checking for blockages in the multiple sets of rolls. The cooling water from the two sets of return pipe assemblies and the cooling water from the drain hopper are transported to the filter box through the drain pipe, where the filter box filters the cooling water.

[0010] Furthermore, the return mechanism includes a second water pump, a second pumping pipe, a connecting pipe, a check valve, and a delivery pipe. The second water pump is installed on the filter box. The second pumping pipe is internally connected to the inlet of the second water pump. The connecting pipe is installed between the filter box and the second pumping pipe. The check valve is installed on the connecting pipe. The delivery pipe is installed between the outlet of the second water pump and the radiator. The second pumping pipe is connected to the water source, and the second water pump is started. The second water pump draws water through the second pumping pipe. The check valve prevents cooling water from entering the filter box through the check valve. The cooling water is delivered to the radiator through the delivery pipe. The filtered cooling water in the filter box also enters the second water pump through the connecting pipe and the second pumping pipe, and is delivered to the radiator through the delivery pipe to form a circulation.

[0011] Furthermore, the heat dissipation mechanism includes a protective cover, a motor, and three sets of fan blades. The protective cover is installed on the workbench, and the motor is installed on the protective cover. The output end of the motor is connected to the input end of the three sets of fan blades. When the motor is started, it drives the three sets of fan blades to rotate. The three sets of fan blades deliver air to accelerate the airflow around the heat dissipation tank, thereby accelerating the cooling of the cooling water in the heat dissipation tank. The protective cover is installed to prevent the fan blades from injuring people.

[0012] Furthermore, the spraying mechanism includes a stepper motor, a reducer, a water spray pipe, multiple sets of nozzles, a water supply hose, and a control valve. The stepper motor is mounted on the workbench, and its output is connected to the input of the reducer. The output of the reducer is connected to the power input of the water spray pipe. The outlet of the water spray pipe is internally connected to the inlet of the multiple sets of nozzles. The water supply hose is installed between the water spray pipe and the water supply pipe assembly. The control valve is installed on the water supply hose. When the temperature of the roll is found to be too high, the operator opens the control valve, and cooling water is delivered to the water spray pipe through the water supply hose. The multiple sets of nozzles spray the cooling water to enhance the cooling effect on the roll. At the same time, the stepper motor is started, and the stepper motor drives the water spray pipe to rotate back and forth through the reducer, increasing the spraying area.

[0013] Compared with the prior art, the present invention has the following advantages: The return conveyor is activated to deliver cooling water to the water supply mechanism, which then delivers the cooling water to the rolling mill to cool the rolls. At the same time, the spray mechanism sprays cooling water onto the rolls to enhance the cooling effect. After passing through the rolling mill, the cooling water enters the filtration mechanism for filtration. The filtered cooling water then circulates back into the water supply mechanism. The heat dissipation mechanism is activated to accelerate the airflow around the water supply mechanism, thus accelerating the cooling of the cooling water. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is an isometric structural schematic diagram of the rolling mill and water supply mechanism of the present invention; Figure 3 This is a cross-sectional isometric structural diagram of the filtration mechanism and the return conveying mechanism of the present invention; Figure 4 This is a partially enlarged cross-sectional isometric structural diagram of the heat dissipation mechanism of the present invention; Figure 5 This is a partially enlarged cross-sectional isometric structural diagram of the spray mechanism of the present invention.

[0016] The attached diagram is labeled as follows: 01, Rolling mill; 11, Workbench; 12, Roll; 13, Connecting sleeve; 14, Drainage hopper; 02, Water supply mechanism; 21, Cooling water tank; 22, First water pump; 23, First water suction pipe; 24, Thermometer; 25, Water supply pipe assembly; 03, Filtration mechanism; 31, Return pipe assembly; 32, Pressure gauge; 33, Drainage pipe; 34, Filter box; 04, Return conveying mechanism; 41, Second water pump; 42, Second water suction pipe; 43, Connecting pipe; 44, Check valve; 45, Water delivery pipe; 05, Cooling mechanism; 51, Protective cover; 52, Motor; 53, Fan blade; 06, Spraying mechanism; 61, Stepper motor; 62, Reducer; 63, Spray pipe; 64, Spray head; 65, Water delivery hose; 66, Control valve. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0021] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0022] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0023] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0024] Example 1 The present invention provides a multi-pass roll cooling water circulation device, comprising a roll mill 01; and further comprising a water supply mechanism 02, a filtration mechanism 03, a return mechanism 04, a heat dissipation mechanism 05, and a spray mechanism 06. The water supply mechanism 02 is installed on the roll mill 01 and supplies cooling water into the roll mill 01. The filtration mechanism 03 is installed on the roll mill 01 and filters the cooling water. The return mechanism 04 is installed on the filtration mechanism 03 and returns the cooling water to the water supply mechanism 02. The heat dissipation mechanism 05 is installed on the roll mill 01 and accelerates the cooling of the cooling water in the water supply mechanism 02. The spray mechanism 06 is installed on the roll mill 01 and accelerates the cooling of the cooling water in the water supply mechanism 02. The water supply mechanism 02 enhances the cooling effect on the rolls; the rolling mill 01 includes a worktable 11, multiple sets of rolls 12, multiple sets of connecting sleeves 13, and a drainage hopper 14. The bottom end of the worktable 11 is connected to the ground. The multiple sets of rolls 12 are rotatably mounted on the worktable 11. The multiple sets of rolls 12 are hollow inside. Each set of rolls 12 has a connecting sleeve 13 rotatably mounted at both ends. The drainage hopper 14 is mounted on the worktable 11; the water supply mechanism 02 includes a heat dissipation tank 21, a first water pump 22, a first water suction pipe 23, a thermometer 24, and a water supply pipe assembly 25. The heat dissipation tank 21 is mounted on the worktable 11. The first water pump 22 is installed on the workbench 11. The first water suction pipe 23 is connected between the heat dissipation tank 21 and the first water pump 22. The thermometer 24 is installed on the first water suction pipe 23. The water supply pipe assembly 25 is connected between the first water pump 22 and the multiple sets of connecting sleeves 13. The filtration mechanism 03 includes two sets of return pipe assemblies 31, two sets of pressure gauges 32, a drain pipe 33, and a filter box 34. Both sets of return pipe assemblies 31 are connected to the inside of the multiple sets of connecting sleeves 13. The two sets of pressure gauges 32 are respectively installed on the two sets of return pipe assemblies 31. The top end of the drain pipe 33 is connected to the bottom end of the drain hopper 14. Furthermore, the drain pipe 33 is internally connected to the two sets of return pipe groups 31, and the top of the filter box 34 is internally connected to the bottom of the drain pipe 33; the return mechanism 04 includes a second water pump 41, a second water pumping pipe 42, a connecting pipe 43, a check valve 44, and a water delivery pipe 45. The second water pump 41 is installed on the filter box 34, the second water pumping pipe 42 is internally connected to the inlet of the second water pump 41, the connecting pipe 43 is connected and installed between the filter box 34 and the second water pumping pipe 42, the check valve 44 is installed on the connecting pipe 43, and the water delivery pipe 45 is connected and installed between the outlet of the second water pump 41 and the heat dissipation tank 21.During operation, firstly, the second water pump 41 is connected to the water source and started. The second water pump 41 draws water through the second water pump 42. A check valve 44 is installed to prevent cooling water from entering the filter box 34. The cooling water is then transported to the heat dissipation tank 21 through the water supply pipe 45. The heat dissipation tank 21 stores cooling water. Then, the first water pump 22 is started and draws the cooling water from the heat dissipation tank 21 through the first water pump 23. The thermometer 24 detects the temperature of the cooling water to ensure the cooling effect on the rolls. The cooling water is then transported to multiple sets of rolling mills through the water supply pipe assembly 25 and the connecting sleeve 13. Inside the rolls 12, cooling water cools multiple sets of rolls 12. The cooling water within the rolls 12 is then transported through the connecting sleeve 13 to two sets of return pipe groups 31. Two pressure gauges 32 monitor the water pressure within the two sets of return pipe groups 31 to check for blockages within the rolls 12. The cooling water in the two sets of return pipe groups 31 and the cooling water in the drain hopper 14 is transported through the drain pipe 33 to the filter box 34. The filter box 34 filters the cooling water. The filtered cooling water in the filter box 34 then enters the second water pump 41 through the connecting pipe 43 and the second pumping pipe 42, and is then transported through the water supply pipe 45 to the cooling water tank 21 to form a circulation.

[0025] Example 2 like Figures 1 to 5As shown, the present invention provides a multi-pass roll cooling water circulation device based on Embodiment 1. The heat dissipation mechanism 05 includes a protective cover 51, a motor 52, and three sets of fan blades 53. The protective cover 51 is mounted on the workbench 11, and the motor 52 is mounted on the protective cover 51. The output end of the motor 52 is connected to the input end of the three sets of fan blades 53. The spraying mechanism 06 includes a stepper motor 61, a reducer 62, a water spray pipe 63, multiple sets of nozzles 64, a water supply hose 65, and a control valve 66. The stepper motor 61 is mounted on the workbench 11, and its output end is connected to the input end of the reducer 62. The output end of the reducer 62 is connected to the power input end of the water spray pipe 63, and the water outlet of the water spray pipe 63... The nozzle 64 is connected to the inlet of the spray pipe 63 and the water supply pipe group 25. The control valve 66 is installed on the water supply hose 65. When it is working, firstly, the second water pump 41 is connected to the water source and the second water pump 41 is started. The second water pump 41 draws water through the second water pump 42. The check valve 44 is set to prevent the cooling water from entering the filter box 34 through the check valve 44. The cooling water is delivered to the heat dissipation tank 21 through the water supply pipe 45. The heat dissipation tank 21 stores cooling water. The first water pump 22 is started and the first water pump 22 draws the cooling water out of the heat dissipation tank 21 through the first water pump 23. The thermometer 24 monitors the temperature of the cooling water. The cooling water is supplied to multiple sets of rolls 12 via a water supply pipe assembly 25 and a connecting sleeve 13 to ensure effective cooling of the rolls. The cooling water within the rolls 12 is then supplied to two sets of return pipe assemblies 31 via the connecting sleeve 13. Two pressure gauges 32 monitor the water pressure within the return pipe assemblies 31 to check for blockages within the rolls 12. The cooling water in the return pipe assemblies 31 and the drainage hopper 14 is supplied to a filter box 34 via a drain pipe 33. The filter box 34 filters the cooling water, and the filtered water then enters the second water supply system via a connecting pipe 43 and a second suction pipe 42. Inside pump 41, water is delivered to cooling water tank 21 through water pipe 45 to form a circulation. Start motor 52 drives three sets of fan blades 53 to rotate. The three sets of fan blades 53 deliver air to accelerate the airflow around cooling water tank 21, accelerating the cooling of cooling water in cooling water tank 21. Protective cover 51 is set to prevent fan blades 53 from injuring people. When the temperature of roll 12 remains high, the operator opens control valve 66. Cooling water is delivered to spray pipe 63 through water delivery hose 65. Multiple sets of nozzles 64 spray cooling water to enhance the cooling effect on roll. At the same time, stepper motor 61 is started. Stepper motor 61 drives spray pipe 63 to rotate back and forth through reducer 62 to increase the spraying area. The sprayed water is collected in drainage hopper 14.

[0026] The first water pump 22, the second water pump 41, the motor 52, the stepper motor 61, and the reducer 62 of this invention are commercially available. Those skilled in the art only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-pass rolling mill cooling water circulation device, comprising a rolling mill (01); characterized in that, It also includes a water supply mechanism (02), a filtration mechanism (03), a return mechanism (04), a heat dissipation mechanism (05), and a spray mechanism (06). The water supply mechanism (02) is installed on the rolling mill (01) and supplies cooling water into the rolling mill (01). The filtration mechanism (03) is installed on the rolling mill (01) and filters the cooling water. The return mechanism (04) is installed on the filtration mechanism (03) and returns the cooling water to the water supply mechanism (02). The heat dissipation mechanism (05) is installed on the rolling mill (01) and accelerates the cooling of the cooling water in the water supply mechanism (02). The spray mechanism (06) is installed on the water supply mechanism (02) and enhances the cooling effect on the rolling mill.

2. The multi-pass roll cooling water circulation device according to claim 1, characterized in that: The rolling mill (01) includes: a workbench (11), multiple sets of rolling mills (12), multiple sets of connecting sleeves (13) and a drainage bucket (14). The bottom end of the workbench (11) is connected to the ground. The multiple sets of rolling mills (12) are rotatably mounted on the workbench (11). The multiple sets of rolling mills (12) are hollow inside. Each set of rolling mills (12) has a connecting sleeve (13) rotatably mounted at both ends. The drainage bucket (14) is mounted on the workbench (11).

3. The multi-pass roll cooling water circulation device according to claim 1 or 2, characterized in that: The water supply mechanism (02) includes: a heat dissipation tank (21), a first water pump (22), a first water pump pipe (23), a thermometer (24), and a water supply pipe assembly (25). The heat dissipation tank (21) is installed on the workbench (11), the first water pump (22) is installed on the workbench (11), the first water pump pipe (23) is connected between the heat dissipation tank (21) and the first water pump (22), the thermometer (24) is installed on the first water pump pipe (23), and the water supply pipe assembly (25) is connected between the first water pump (22) and multiple sets of connecting sleeves (13).

4. The multi-pass roll cooling water circulation device according to claim 1, characterized in that: The filter mechanism (03) includes: two sets of return pipe groups (31), two sets of pressure gauges (32), a drain pipe (33) and a filter box (34). The two sets of return pipe groups (31) are connected to the interior of multiple sets of connecting sleeves (13). The two sets of pressure gauges (32) are respectively installed on the two sets of return pipe groups (31). The top end of the drain pipe (33) is connected to the interior of the bottom end of the drain hopper (14), and the drain pipe (33) is connected to the interior of the two sets of return pipe groups (31). The top end of the filter box (34) is connected to the interior of the bottom end of the drain pipe (33).

5. The multi-pass roll cooling water circulation device according to claim 1, characterized in that: The return mechanism (04) includes: a second water pump (41), a second water pumping pipe (42), a connecting pipe (43), a check valve (44), and a water delivery pipe (45). The second water pump (41) is installed on the filter box (34). The second water pumping pipe (42) is connected to the inlet of the second water pump (41). The connecting pipe (43) is connected and installed between the filter box (34) and the second water pumping pipe (42). The check valve (44) is installed on the connecting pipe (43). The water delivery pipe (45) is connected and installed between the outlet of the second water pump (41) and the heat dissipation tank (21).

6. The multi-pass roll cooling water circulation device according to claim 1, characterized in that: The heat dissipation mechanism (05) includes: a protective cover (51), a motor (52) and three sets of fan blades (53). The protective cover (51) is installed on the workbench (11), the motor (52) is installed on the protective cover (51), and the output end of the motor (52) is connected to the input end of the three sets of fan blades (53).

7. The multi-pass roll cooling water circulation device according to claim 1, characterized in that: The spraying mechanism (06) includes: a stepper motor (61), a reducer (62), a water spray pipe (63), multiple sets of nozzles (64), a water supply hose (65), and a control valve (66). The stepper motor (61) is mounted on the workbench (11). The output end of the stepper motor (61) is connected to the input end of the reducer (62). The output end of the reducer (62) is connected to the power input end of the water spray pipe (63). The outlet of the water spray pipe (63) is connected to the inlet of the multiple sets of nozzles (64). The water supply hose (65) is connected and installed between the water spray pipe (63) and the water supply pipe group (25). The control valve (66) is installed on the water supply hose (65).

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