Wear-resistant chromium alloy roller and cooling system

Abstract

The utility model relates to a wear-resistant chromium alloy roller and a cooling system, and belongs to the technical field of roller cooling. Comprising a first water inlet branch pipe connected with a left-end rotary joint A, a second water inlet branch pipe connected with a left-end rotary joint B, a first water outlet branch pipe connected with a right-end rotary joint A, a second water outlet branch pipe connected with a right-end rotary joint B and a communicating pipe, and the other ends of the first water inlet branch pipe and the second water inlet branch pipe are converged and then connected with a water inlet main pipe; a second circulating pump and a second one-way valve are installed on the second water inlet branch pipe, the two ends of the communicating pipe are connected to a water outlet of the first water inlet branch pipe and a water outlet of the second water inlet branch pipe respectively, a communicating valve A is installed on the communicating pipe, and a cooling system is connected between the water inlet main pipe and the water outlet main pipe. The cooling device has the beneficial effects that the problem of property loss caused by the fact that the upper roller and the lower roller cannot be cooled in time when one group of circulating pumps breaks down can be solved.

Description

Technical Field

[0001] This utility model relates to a wear-resistant chromium alloy roll and a cooling system, belonging to the field of roll cooling technology. Background Technology

[0002] Rolls are the main working parts and tools on a rolling mill that cause continuous plastic deformation of metal. A roll mainly consists of three parts: the roll body, the roll neck, and the shaft end. During rolling, the contact between the roll and the high-temperature material, as well as the plastic deformation, generate a large amount of heat, which may cause the roll to soften, deform, or even be damaged. Water cooling can quickly dissipate heat, maintain the roll's hardness and dimensional stability, and extend its service life.

[0003] Utility model patent number 201620623800.3 discloses a roll with internal cooling effect, including a roll body and a through shaft passing through the center of the roll body axially. The through shaft includes a shaft body, a shaft head, a water inlet, a water outlet, and a through hole. The shaft body is located inside the roll body, and the shaft head is located at both ends of the shaft body. A spiral hollow groove is provided on the surface of the shaft body. The water inlet and the water outlet are respectively located at both ends of the shaft body near the shaft head. The through hole is located at both ends of the shaft body and is arranged perpendicular to the center line of the through shaft. The spiral hollow groove communicates with the water inlet and the water outlet through the through hole.

[0004] While the aforementioned patent offers good sealing and cooling effects and can improve the hardness of the rolls, current technology is not comprehensive and has the following drawbacks: 1. The existing cooling system only has one set of circulating pumps. If this set of circulating pumps malfunctions for an extended period, it will be unable to cool the upper and lower rolls in a timely manner, posing operational risks and potentially causing property damage. 2. Using only water-cooled units for cooling will lead to shutdowns due to high evaporator recovery temperatures.

[0005] To solve one of the above problems, there is an urgent need for a wear-resistant chromium alloy roll and a cooling system. Utility Model Content

[0006] Based on the shortcomings of the existing technology, the technical problem to be solved by this utility model is: how to solve the problem of property damage caused by the failure of a set of circulating pumps to cool the upper and lower rolls in time. To this end, a wear-resistant chromium alloy roll and cooling system are provided.

[0007] The wear-resistant chromium alloy roll and cooling system of this utility model include a pair of upper rolls and lower rolls. Both the upper and lower rolls have water-cooling chambers inside. A left-end rotary joint A and a right-end rotary joint A are respectively installed on the water inlet and outlet of the upper roll. A left-end rotary joint B and a right-end rotary joint B are respectively installed on the water inlet and outlet of the lower roll. The system is characterized by further including a first water inlet branch pipe connected to the left-end rotary joint A, a second water inlet branch pipe connected to the left-end rotary joint B, a first water outlet branch pipe connected to the right-end rotary joint A, and a second water outlet branch pipe connected to the right-end rotary joint A. Connector B connects to the second outlet branch pipe and the connecting pipe. The other ends of the first and second inlet branch pipes merge and connect to the main inlet pipe. The other ends of the first and second outlet branch pipes merge and connect to the main outlet pipe. A first circulation pump and a first check valve are installed on the first inlet branch pipe. A second circulation pump and a second check valve are installed on the second inlet branch pipe. The two ends of the connecting pipe are respectively connected to the outlets of the first and second inlet branch pipes. A connecting valve A is installed on the connecting pipe. A cooling system is connected between the main inlet pipe and the main outlet pipe.

[0008] The connecting valve A is normally closed. After the upper and lower rolls are started, the first and second circulation pumps need to be turned on simultaneously. The first and second circulation pumps supply cooling water to the upper and lower rolls respectively to cool them. The cooling water flowing through the upper and lower rolls returns to the cooling system through the main outlet pipe. The cooling system cools the returning cooling water so that it can be re-supplied to the upper and lower rolls through the first and second circulation pumps.

[0009] When the first circulation pump fails, but the second circulation pump remains intact, the connecting valve A can be opened. Cooling water in the second inlet branch pipe can then enter the upper roll through the connecting pipe and the left-end rotary joint A, thus supplying water to both the upper and lower rolls simultaneously via the second circulation pump. Conversely, when the second circulation pump fails, but the first circulation pump remains intact, the connecting valve A can be opened. Cooling water in the first inlet branch pipe can then enter the lower roll through the connecting pipe and the left-end rotary joint B, again supplying water to both the upper and lower rolls simultaneously via the first circulation pump. This solution addresses the problem of property damage caused by the inability to cool the upper and lower rolls in time when one set of circulation pumps fails.

[0010] Preferably, both the upper and lower rolls are wear-resistant chromium alloy rolls.

[0011] Preferably, the cooling system includes a cooling unit connected to the main water outlet pipe, the outlet of the cooling unit being connected to the inlet of the refrigeration unit via a cooling water pipe, the outlet of the refrigeration unit being connected to the first inlet of the pipe mixer via a chilled water pipe, a bypass pipe being connected to the second inlet of the pipe mixer, the other end of the bypass pipe being connected to the cooling water pipe, the main water inlet pipe being connected to the outlet of the pipe mixer, an electric control valve and a first remote flow meter being installed on the bypass pipe, and a second remote flow meter being installed on the main water outlet pipe.

[0012] Preferably, the system further includes a temperature sensor for detecting the surface temperature of the lower roll. The temperature sensor is electrically connected to the signal input terminal of the controller, and the electric control valve is electrically connected to the signal output terminal of the controller. The first remote flow meter and the second remote flow meter are wirelessly connected to the controller. Based on the temperature signal collected by the temperature sensor, the signal is transmitted to the controller, which controls the opening of the electric control valve to control the flow rate of the liquid flowing through the bypass pipe. The second remote flow meter is used to monitor the flow information of the pipeline in which it is located, and the first remote flow meter is used to monitor the flow information of the pipeline in which it is located.

[0013] When the temperature sensor detects that the temperature of the lower roll exceeds the preset temperature, the controller needs to reduce the opening of the electric control valve to allow more cooling water to flow through the refrigeration unit. The refrigeration unit produces more chilled water to cool the upper and lower rolls. This situation usually occurs in summer.

[0014] When the temperature sensor detects that the temperature of the lower roll is lower than the preset temperature, the opening of the electric control valve needs to be increased by the controller. The cooling water is cooled by the cooling unit, so that less cooling water flows through the refrigeration unit. The refrigeration unit produces a small amount of chilled water to cool the upper and lower rolls, which reduces the cooling power of the chiller unit and saves electricity. This situation usually occurs in winter.

[0015] This application first uses a cooling unit to lower the temperature, and then uses a refrigeration unit to lower the temperature, which solves the problem of the chiller unit failing and shutting down due to the high recovery temperature of the evaporator.

[0016] Preferably, the refrigeration unit includes a condenser and an evaporator. The cooling water pipe is connected to the inlet of the evaporator, the chilled water pipe is connected to the outlet of the evaporator, the outlet of the condenser is connected to the inlet of the open cooling tower through a third circulation pipe, and the inlet of the condenser is connected to the outlet of the open cooling tower through a fourth circulation pipe, forming a closed-loop circulating cooling water pipeline. A third circulation pump is installed on the fourth circulation pipe.

[0017] Preferably, the cooling unit includes a plate heat exchanger and a first cooling tower. The outlet water pipe is connected to the heat medium inlet of the plate heat exchanger, the cooling water pipe is connected to the heat medium outlet of the plate heat exchanger, the refrigerant outlet of the plate heat exchanger is connected to the inlet of the first cooling tower through a first circulation pipe, and the refrigerant inlet of the plate heat exchanger is connected to the outlet of the first cooling tower through a second circulation pipe, forming a closed-loop circulating cooling water pipeline. A fourth circulation pump is installed on the first circulation pipe.

[0018] Preferably, the first cooling tower is a closed-loop cooling tower.

[0019] Preferably, the temperature sensor is an infrared temperature sensor, but it can also be replaced with an infrared thermal imager.

[0020] Preferably, the first remote flow meter and the second remote flow meter have the same structure, both being remote metal rotor flow meters.

[0021] Preferably, the controller is a PLC, a DCS controller, or a microcontroller.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The wear-resistant chromium alloy roll and cooling system described in this utility model can solve the problem of property damage caused by the failure of a set of circulating pumps to cool the upper and lower rolls in time.

[0024] The wear-resistant chromium alloy roll and cooling system described in this utility model first uses a cooling unit to lower the temperature, and then uses a refrigeration unit to lower the temperature. This solves the problem of the chiller unit failing and shutting down due to the high recovery temperature of the evaporator, a situation that usually occurs in summer.

[0025] The wear-resistant chromium alloy roll and cooling system described in this utility model, when the temperature sensor detects that the temperature of the lower roll is lower than the preset temperature, needs to increase the opening of the electric control valve through the controller. The cooling unit mainly uses the cooling water to cool down, allowing less cooling water to flow through the refrigeration unit. The refrigeration unit produces a small amount of chilled water to cool the upper and lower rolls, reducing the cooling power of the chiller unit and saving electricity. This situation generally occurs in winter. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0027] Figure 1 This is a schematic diagram of the structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the refrigeration unit of this utility model;

[0029] Figure 3 This is a schematic diagram of the cooling unit of this utility model;

[0030] In the diagram: 1. Upper roller; 2. Lower roller; 3. Left rotary joint A; 4. Right rotary joint A; 5. Left rotary joint B; 6. Right rotary joint B; 7. First inlet branch pipe; 8. Second inlet branch pipe; 9. Main inlet pipe; 10. First circulating pump; 11. First check valve; 12. Second circulating pump; 13. Second check valve; 14. First outlet branch pipe; 15. Second outlet branch pipe; 16. Main outlet pipe; 17. Connecting pipe; 18. Connecting valve A; 19. Pipe mixer; 20. Bypass pipe; 21. Temperature sensor; 22. Controller; 23. Electric control valve; 24. First remote flow meter; 25. Chilled water pipe; 26. Refrigeration unit; 27. Cooling water pipe; 28. Cooling unit; 29. ​​Second remote flow meter; 30. Condenser; 31. Evaporator; 32. Open cooling tower; 33. Third circulating pump; 34. Plate heat exchanger; 35. First cooling tower; 36. Fourth circulating pump. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings: The present invention will be further described below through specific embodiments, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0032] Example 1, such as Figure 1As shown, the wear-resistant chromium alloy roll and cooling system include a pair of upper rolls 1 and lower rolls 2. Both the upper roll 1 and lower roll 2 have water-cooling chambers. A left-end rotary joint A3 and a right-end rotary joint A4 are respectively installed on the water inlet and outlet of the upper roll 1. A left-end rotary joint B5 and a right-end rotary joint B6 are respectively installed on the water inlet and outlet of the lower roll 2. The system is characterized by further including a first water inlet branch pipe 7 connected to the left-end rotary joint A3, a second water inlet branch pipe 8 connected to the left-end rotary joint B5, a first water outlet branch pipe 14 connected to the right-end rotary joint A4, and a second water outlet branch pipe 14 connected to the right-end rotary joint B6. Water branch pipe 15 and connecting pipe 17, the other ends of the first water inlet branch pipe 7 and the second water inlet branch pipe 8 merge and are connected to the main water inlet pipe 9, the other ends of the first water outlet branch pipe 14 and the second water outlet branch pipe 15 merge and are connected to the main water outlet pipe 16, the first water inlet branch pipe 7 is equipped with a first circulation pump 10 and a first one-way valve 11, the second water inlet branch pipe 8 is equipped with a second circulation pump 12 and a second one-way valve 13, the two ends of the connecting pipe 17 are respectively connected to the outlets of the first water inlet branch pipe 7 and the second water inlet branch pipe 8, the connecting pipe 17 is equipped with a connecting valve A18, and a cooling system is connected between the main water inlet pipe 9 and the main water outlet pipe 16.

[0033] The connecting valve A18 is normally closed. After the upper roll 1 and the lower roll 2 are started, the first circulation pump 10 and the second circulation pump 12 need to be turned on simultaneously. The first circulation pump 10 and the second circulation pump 12 supply cooling water to the upper roll 1 and the lower roll 2 respectively to cool the upper roll 1 and the lower roll 2. The cooling water flowing through the upper roll 1 and the lower roll 2 returns to the cooling system through the water outlet pipe 16. The cooling system cools the returned cooling water so that it can be supplied with water to the upper roll 1 and the lower roll 2 again through the first circulation pump 10 and the second circulation pump 12.

[0034] When the first circulation pump 10 fails, the second circulation pump 12 remains intact. The connecting valve A18 can be opened, allowing cooling water from the second inlet branch pipe 8 to enter the upper roll 1 through the connecting pipe 17 and the left-end rotary joint A3. This allows the second circulation pump 12 to simultaneously supply water to both the upper roll 1 and the lower roll 2. Conversely, when the second circulation pump 12 fails, the first circulation pump 10 remains intact. The connecting valve A18 can be opened, allowing cooling water from the first inlet branch pipe 7 to enter the lower roll 2 through the connecting pipe 17 and the left-end rotary joint B5. This allows the first circulation pump 10 to simultaneously supply water to both the upper roll 1 and the lower roll 2. Therefore, this solution addresses the problem of property damage caused by the inability to cool the upper roll 1 and lower roll 2 in time when one set of circulation pumps fails.

[0035] Example 2, as Figure 1-2As shown, the wear-resistant chromium alloy roll and cooling system include a pair of upper rolls 1 and lower rolls 2. Both the upper roll 1 and lower roll 2 have water-cooling chambers. A left-end rotary joint A3 and a right-end rotary joint A4 are respectively installed on the water inlet and outlet of the upper roll 1. A left-end rotary joint B5 and a right-end rotary joint B6 are respectively installed on the water inlet and outlet of the lower roll 2. The system is characterized by further including a first water inlet branch pipe 7 connected to the left-end rotary joint A3, a second water inlet branch pipe 8 connected to the left-end rotary joint B5, a first water outlet branch pipe 14 connected to the right-end rotary joint A4, and a second water outlet branch pipe 14 connected to the right-end rotary joint B6. Water branch pipe 15 and connecting pipe 17, the other ends of the first water inlet branch pipe 7 and the second water inlet branch pipe 8 merge and are connected to the main water inlet pipe 9, the other ends of the first water outlet branch pipe 14 and the second water outlet branch pipe 15 merge and are connected to the main water outlet pipe 16, the first water inlet branch pipe 7 is equipped with a first circulation pump 10 and a first one-way valve 11, the second water inlet branch pipe 8 is equipped with a second circulation pump 12 and a second one-way valve 13, the two ends of the connecting pipe 17 are respectively connected to the outlets of the first water inlet branch pipe 7 and the second water inlet branch pipe 8, the connecting pipe 17 is equipped with a connecting valve A18, and a cooling system is connected between the main water inlet pipe 9 and the main water outlet pipe 16.

[0036] Furthermore, both the upper roll 1 and the lower roll 2 are wear-resistant chromium alloy rolls.

[0037] Furthermore, referring to Figure 3 The cooling system includes a cooling unit 28 connected to the outlet water main 16. The outlet of the cooling unit 28 is connected to the inlet of the refrigeration unit 26 via a cooling water pipe 27. The outlet of the refrigeration unit 26 is connected to the first inlet of the pipe mixer 19 via a chilled water pipe 25. A bypass pipe 20 is connected to the second inlet of the pipe mixer 19. The other end of the bypass pipe 20 is connected to the cooling water pipe 27. The inlet water main 9 is connected to the outlet of the pipe mixer 19. An electric control valve 23 and a first remote flow meter 24 are installed on the bypass pipe 20. A second remote flow meter 29 is installed on the outlet water main 16.

[0038] Furthermore, it also includes a temperature sensor 21 for detecting the surface temperature of the lower roll 2. The temperature sensor 21 is electrically connected to the signal input terminal of the controller 22, and the electric control valve 23 is electrically connected to the signal output terminal of the controller 22. The first remote flow meter 24 and the second remote flow meter 29 are wirelessly connected to the controller 22. Based on the temperature signal collected by the temperature sensor 21, the signal is transmitted to the controller 22. The controller 22 controls the opening of the electric control valve 23 to control the flow rate of the liquid flowing through the bypass pipe 20. The second remote flow meter 29 is used to monitor the flow information of the pipeline it is in, and the first remote flow meter 24 is used to monitor the flow information of the pipeline it is in.

[0039] When the temperature sensor 21 detects that the temperature of the lower roll 2 exceeds the preset temperature, the controller 22 needs to reduce the opening of the electric control valve 23 to allow more cooling water to flow through the refrigeration unit 26. The refrigeration unit 26 produces more chilled water to cool the upper roll 1 and the lower roll 2. This situation usually occurs in summer.

[0040] When the temperature sensor 21 detects that the temperature of the lower roll 2 is lower than the preset temperature, the opening of the electric control valve 23 needs to be increased by the controller 22. The cooling water is mainly cooled by the cooling unit 28, allowing less cooling water to flow through the refrigeration unit 26. The refrigeration unit 26 produces a small amount of chilled water to cool the upper roll 1 and the lower roll 2, reducing the cooling power of the chiller unit and saving electricity. This situation generally occurs in winter.

[0041] The system first uses cooling unit 28 to lower the temperature, and then uses chiller unit 26 to lower the temperature, which solves the problem of the chiller unit failing and shutting down due to the high recovery temperature of the evaporator.

[0042] Furthermore, referring to Figure 2 The refrigeration unit 26 includes a condenser 30 and an evaporator 31. The cooling water pipe 27 is connected to the inlet of the evaporator 31, and the chilled water pipe 25 is connected to the outlet of the evaporator 31. The outlet of the condenser 30 is connected to the inlet of the open cooling tower 32 through a third circulation pipe, and the inlet of the condenser 30 is connected to the outlet of the open cooling tower 32 through a fourth circulation pipe, forming a closed-loop circulating cooling water pipeline. A third circulation pump 33 is installed on the fourth circulation pipe.

[0043] Furthermore, the cooling unit 28 includes a plate heat exchanger 34 and a first cooling tower 35. The outlet water pipe 16 is connected to the heat medium inlet of the plate heat exchanger 34, and the cooling water pipe 27 is connected to the heat medium outlet of the plate heat exchanger 34. The refrigerant outlet of the plate heat exchanger 34 is connected to the inlet of the first cooling tower 35 through a first circulation pipe, and the refrigerant inlet of the plate heat exchanger 34 is connected to the outlet of the first cooling tower 35 through a second circulation pipe, forming a closed-loop circulating cooling water pipeline. A fourth circulation pump 36 is installed on the first circulation pipe.

[0044] Furthermore, the first cooling tower 35 is a closed cooling tower.

[0045] Furthermore, the temperature sensor 21 is an infrared temperature sensor, but it can also be replaced with an infrared thermal imager.

[0046] Furthermore, the first remote flow meter 24 and the second remote flow meter 29 have the same structure, both being remote metal rotor flow meters.

[0047] Furthermore, the controller 22 is a PLC, DCS controller, or microcontroller. In this embodiment, the modification of the prior art lies in the hardware part, and the computer program involved is a simple program whose functions can be easily implemented by those skilled in the art using existing computer program development platforms and well-known programming methods.

[0048] The wear-resistant chromium alloy roll and cooling system described in this utility model can solve the problem of property damage caused by the failure of a set of circulating pumps to cool the upper and lower rolls in time, which usually occurs in winter.

[0049] The wear-resistant chromium alloy roll and cooling system described in this utility model first uses a cooling unit to lower the temperature, and then uses a refrigeration unit to lower the temperature. This solves the problem of the chiller unit failing and shutting down due to the high recovery temperature of the evaporator, a situation that usually occurs in summer.

[0050] The wear-resistant chromium alloy roll and cooling system described in this utility model, when the temperature sensor detects that the temperature of the lower roll is lower than the preset temperature, needs to increase the opening of the electric control valve through the controller. The cooling unit mainly uses the cooling water to cool down, allowing less cooling water to flow through the refrigeration unit. The refrigeration unit produces a small amount of chilled water to cool the upper and lower rolls, reducing the cooling power of the chiller unit and saving electricity. This situation generally occurs in winter.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

[0052] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A wear-resistant chromium alloy roller and cooling system, comprising an upper roller and a lower roller arranged in pairs, both the upper roller and the lower roller having a water cooling cavity inside, a left end rotary joint A and a right end rotary joint A being respectively installed on the water inlet and the water outlet of the upper roller, and a left end rotary joint B and a right end rotary joint B being respectively installed on the water inlet and the water outlet of the lower roller, characterized in that: It also includes a first inlet branch pipe connected to the left-end rotary joint A, a second inlet branch pipe connected to the left-end rotary joint B, a first outlet branch pipe connected to the right-end rotary joint A, a second outlet branch pipe connected to the right-end rotary joint B, and a connecting pipe. The other ends of the first and second inlet branch pipes merge and are connected to the main inlet pipe. The other ends of the first and second outlet branch pipes merge and are connected to the main outlet pipe. A first circulation pump and a first check valve are installed on the first inlet branch pipe. A second circulation pump and a second check valve are installed on the second inlet branch pipe. The two ends of the connecting pipe are respectively connected to the outlets of the first and second inlet branch pipes. A connecting valve A is installed on the connecting pipe. A cooling system is connected between the main inlet pipe and the main outlet pipe.

2. The wear-resistant chromium alloy roll and cooling system according to claim 1, characterized in that, Both the upper and lower rolls are wear-resistant chromium alloy rolls.

3. The wear-resistant chromium alloy roll and cooling system according to claim 2, characterized in that, The cooling system includes a cooling unit connected to the main water outlet. The outlet of the cooling unit is connected to the inlet of the chiller unit via a cooling water pipe. The outlet of the chiller unit is connected to the first inlet of the pipe mixer via a chilled water pipe. A bypass pipe is connected to the second inlet of the pipe mixer. The other end of the bypass pipe is connected to the cooling water pipe. The main water inlet is connected to the outlet of the pipe mixer. An electric control valve and a first remote flow meter are installed on the bypass pipe. A second remote flow meter is installed on the main water outlet.

4. The wear-resistant chromium alloy roll and cooling system according to claim 3, characterized in that, It also includes a temperature sensor for detecting the surface temperature of the lower roll, the temperature sensor being electrically connected to the signal input terminal of the controller, and the electric control valve being electrically connected to the signal output terminal of the controller.

5. The wear-resistant chromium alloy roll and cooling system according to claim 4, characterized in that, The refrigeration unit includes a condenser and an evaporator. The cooling water pipe is connected to the inlet of the evaporator, and the chilled water pipe is connected to the outlet of the evaporator. The outlet of the condenser is connected to the inlet of the open cooling tower through a third circulation pipe, and the inlet of the condenser is connected to the outlet of the open cooling tower through a fourth circulation pipe, forming a closed-loop circulating cooling water pipeline. A third circulation pump is installed on the fourth circulation pipe.

6. The wear-resistant chromium alloy roll and cooling system according to claim 5, characterized in that, The cooling unit includes a plate heat exchanger and a first cooling tower. The outlet water pipe is connected to the heat medium inlet of the plate heat exchanger, and the cooling water pipe is connected to the heat medium outlet of the plate heat exchanger. The refrigerant outlet of the plate heat exchanger is connected to the inlet of the first cooling tower through a first circulation pipe, and the refrigerant inlet of the plate heat exchanger is connected to the outlet of the first cooling tower through a second circulation pipe, forming a closed-loop circulating cooling water pipeline. A fourth circulation pump is installed on the first circulation pipe.

7. The wear-resistant chromium alloy roll and cooling system according to claim 6, characterized in that, The first cooling tower is a closed-loop cooling tower.

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