Water cooled centrifuge tube mold cooling system and method

Abstract

This invention belongs to the field of cooling control technology for centrifugal casting equipment, and relates to a water-cooled centrifuge mold cooling system and method. The water-cooled centrifuge mold cooling system includes a main inlet water pipe, a main inlet water switch valve, a centrifuge body, and a return water unit. The main inlet water switch valve is located on the main inlet water pipe. The inlet of the centrifuge body is connected to the main inlet water pipe, and the outlet is connected to the return water unit. Molds are installed inside the centrifuge body. A bypass water pipe is connected in parallel to the main inlet water pipe, and a bypass regulating valve is installed on the bypass water pipe. The bypass regulating valve adjusts its opening to change the diversion flow rate, thereby regulating the total flow rate of cooling water entering the centrifuge body. This invention avoids pressure fluctuations caused by direct throttling of the main inlet water pipe, making the cooling water flow regulation process smoother and more stable, effectively reducing the temperature fluctuation range of the mold, alleviating thermal fatigue of the mold, and improving the service life of the mold.

Description

Technical Field

[0001] This invention belongs to the field of cooling control technology for centrifugal casting equipment, specifically relating to a water-cooled centrifuge tube mold cooling system and cooling method. Background Technology

[0002] The pipe mold is a core component in the centrifugal casting production of ductile iron pipes. During the centrifugal casting process, the pipe mold rotates at high speed with the centrifuge. The molten iron injected inside adheres evenly to the inner wall of the pipe mold under centrifugal force. After continuous cooling by the cooling water on the outer wall, it solidifies and forms the pipe, ultimately yielding a cast pipe product that meets the dimensional and performance requirements. The structural design, material properties, and cooling conditions of the pipe mold directly determine the forming quality and production efficiency of the cast pipe. Furthermore, due to the high cost of the pipe mold itself and its repair costs, its service life directly affects the overall production cost of the entire production line.

[0003] Existing water-cooled centrifuges typically use one-piece metal cylinder molds with internal cavities that match the shape of the target cast pipe to accommodate the centrifugal casting requirements of different pipe specifications. For example, Chinese patent document CN204075118U discloses a water-cooled centrifuge pipe mold. This mold includes a one-piece mold body, with sequentially connected spigot end cavity, first transition cavity, conical cavity, second transition cavity, and socket end cavity inside. The diameter of the left end of the conical cavity is smaller than that of the right end. The mold body is made of 21CrMn10 material. This mold structure allows ductile iron to be directly cast into pipes using a centrifuge, replacing traditional rolling and welding methods. A single mold can be reused thousands of times, effectively improving the production efficiency of pipes and representing a typical structural form of mold bodies in the current field of water-cooled centrifugal casting.

[0004] In the centrifugal casting process of ductile iron pipes, the pipe mold is constantly in an alternating thermal stress environment where the inner wall is in contact with high-temperature molten iron and the outer wall is continuously cooled by cooling water. Traditional cooling systems typically use direct control of the main pipeline for temperature management, that is, directly installing pneumatic or electric regulating valves on the main inlet pipe to control the flow rate of cooling water entering the centrifuge. From the perspective of the cooling system's operating mechanism, the water pump supplying the cooling system usually operates at a constant speed, and its output water pressure is relatively constant. When the regulating valve on the main inlet pipe is closed to try to reduce the cooling water flow, the local fluid resistance in the pipe will increase sharply and instantaneously. Since the water pump continues to pump water into the pipe at a constant pressure, the water pressure in front of the shut-off valve will rapidly accumulate and produce violent fluctuations. This high-pressure water flow not only exerts a strong positive impact and erosion on the valve core and sealing structure, easily causing cavitation inside the valve and accelerating its damage, but the unreleased surge in water pressure also creates severe water hammer waves that propagate downstream of the pipeline network, causing violent reverse impacts on the pump impeller and mechanical seal, easily leading to pump stalling, pump motor overload, or even pipeline rupture. Furthermore, the centrifuge's operating environment is extremely humid, accompanied by strong heat radiation and equipment vibration. Under such harsh conditions, if an electric regulating valve is used, its electric actuator has a slow response speed and is easily affected by complex environmental interference, resulting in high daily maintenance costs. Therefore, in fluid engineering design, it is generally necessary to avoid directly installing regulating valves on the main inlet pipeline for significant throttling and water control.

[0005] If a more adaptable pneumatic on / off valve is chosen instead, its limited open and closed states prevent precise water flow regulation, leading to frequent pressure fluctuations in the main pipeline and abrupt changes in water flow during adjustment. This results in drastic temperature fluctuations in the mold. These extreme temperature changes cause frequent and violent contractions of the crystal lattice within the metal mold, making it highly susceptible to thermal cracks. These micro-cracks then propagate deeper into the mold, severely exacerbating thermal fatigue. This not only leads to the extremely costly and expensive mold requiring frequent welding repairs or even complete scrapping due to internal defects, significantly shortening its service life, but also, improper temperature control can cause porosity on the surface of newly cast ductile iron pipes during subsequent pours due to excessively low temperatures, severely impacting the final product's appearance quality. Summary of the Invention

[0006] The purpose of this invention is to provide a water-cooled centrifuge tube mold cooling system to solve the technical problem that tube molds are easily damaged under alternating thermal stress in the prior art; the purpose of this invention is also to provide a water-cooled centrifuge tube mold cooling method to alleviate the thermal fatigue phenomenon of tube molds and improve the service life of tube molds.

[0007] To solve the above problems, the present invention proposes a technical solution for a water-cooled centrifuge tube mold cooling system as follows:

[0008] A water-cooled centrifuge tube mold cooling system includes a main inlet water pipe, a main inlet water switch valve, a centrifuge body, and a return water unit. The main inlet water switch valve is installed on the main inlet water pipe. The inlet of the centrifuge body is connected to the main inlet water pipe, and the outlet of the centrifuge body is connected to the return water unit. A tube mold is installed inside the centrifuge body. The system also includes a bypass water pipe and a bypass regulating valve. The bypass regulating valve is installed on the bypass water pipe. The inlet of the bypass water pipe is connected to the main inlet water pipe, and the outlet of the bypass water pipe is connected to the return water unit. The bypass regulating valve adjusts its opening to change the diversion flow rate of the bypass water pipe, thereby regulating the total flow rate of cooling water entering the centrifuge body.

[0009] The beneficial effects of the water-cooled centrifuge tube mold cooling system: This invention adopts a diversion structure with a bypass water pipe and a bypass regulating valve. It can regulate the total flow rate of cooling water entering the centrifuge body without directly changing the flow state of the main inlet water pipe, avoiding pressure fluctuations caused by direct throttling of the main inlet water pipe. This makes the cooling water flow regulation process smoother and more stable, effectively reducing the temperature fluctuation of the tube mold, alleviating the thermal fatigue of the tube mold, and improving the service life of the tube mold. At the same time, the main inlet water pipe can maintain a continuous flow state, and even if the bypass regulating valve malfunctions, it can still maintain the basic cooling water supply, improving the safety of the cooling system operation.

[0010] Furthermore, the bypass regulating valve is a pneumatic proportional regulating valve, and the opening degree of the pneumatic proportional regulating valve is continuously adjusted according to a set ratio.

[0011] Beneficial effects: The pneumatic proportional control valve can achieve continuous proportional adjustment of the opening degree, and can precisely control the diversion flow of the bypass water pipe, so that the cooling water flow entering the centrifuge body changes smoothly, further improving the accuracy of cooling regulation. At the same time, the pneumatic drive is suitable for the working environment of the centrifuge site, with fast response speed, strong anti-interference ability, and ensures the stability and reliability of the regulation process.

[0012] Furthermore, two bypass regulating valves are provided on the same bypass water pipe, and the two bypass regulating valves are arranged in parallel. One of the two bypass regulating valves serves as the main regulating valve, and the other serves as the standby regulating valve.

[0013] Beneficial effects: By adopting a one-main-one-backup configuration, when one regulating valve fails, the other can take over the diversion regulation function, avoiding sudden changes in cooling status caused by regulation failure, ensuring continuous and stable operation of the cooling system, and reducing the frequency of equipment downtime for maintenance.

[0014] Furthermore, the connection point between the bypass water pipe and the main inlet water pipe is located on the side of the main inlet water switch valve away from the centrifuge body.

[0015] Beneficial effects: It enables the cooling system to have a high fluid pipeline protection capability. When the pouring operation is completed and the main water inlet valve is closed instantly, the rear pipeline is completely sealed off. At this time, the water continuously pumped out by the front water pump can be directly discharged and returned through the bypass water pipe that is in the open state, eliminating the impact force of the surge in water flow in the pipeline, avoiding the occurrence of pump blockage, and extending the service life of the water pump and the main water inlet pipeline.

[0016] Furthermore, the main inlet valve is a pneumatic valve.

[0017] Beneficial effects: Pneumatic switching valves are suitable for the humid and vibrating working environment of centrifuges, with stronger environmental adaptability and vibration resistance, lower failure rate, and reduced daily maintenance costs. At the same time, pneumatic switching valves have a faster response speed and can quickly complete on / off switching to match the timing requirements of pouring operations.

[0018] Furthermore, the water return unit includes a water return pipe and a water return tank. The outlet of the centrifuge body is connected to the water return tank through the water return pipe, and the other end of the bypass water pipe is connected to the water return tank.

[0019] Beneficial effects: It allows the high-temperature water discharged from the centrifuge body and the excess cold water discharged from the bypass water pipe to be uniformly merged into the return water pool, forming a complete water circulation closed loop, thus saving on-site water resources.

[0020] Furthermore, the water return unit also includes a cooling water tank, the outlet end of the water return pipe is connected to the inlet end of the cooling water tank, and the outlet end of the cooling water tank is connected to the inlet end of the water return pool.

[0021] Beneficial effects: The cooling water tank can cool down the high-temperature cooling water returning to the system, keeping the cooling water in the return water tank at a suitable temperature range. This prevents the cooling effect from decreasing due to the continuous rise in circulating water temperature, and improves the overall cooling capacity and operational stability of the cooling system.

[0022] Furthermore, the pipe mold is a pipe mold used for centrifugal casting of ductile iron pipes.

[0023] Beneficial effects: It enables the cooling system to match the process characteristics of centrifugal casting of ductile iron pipes, specifically addressing the production pain points of rapid thermal fatigue damage and high replacement costs of this type of pipe mold, and fully leveraging the cooling control effect of the bypass adjustment scheme.

[0024] Furthermore, the main water inlet pipe has two branches, the output ends of which are respectively connected to the water inlet of the centrifuge body. Each main water inlet pipe is connected to a bypass water pipe, and each bypass water pipe is equipped with the bypass regulating valve.

[0025] Beneficial effects: The installation of two main water inlet pipes, each connected to the centrifuge body's inlet, allows for more even distribution of cooling water into the centrifuge body, improving the uniformity of cooling of the tube molds and preventing significant differences in localized cooling intensity. The two main water inlet pipes serve as backups for each other. If one main water inlet pipe or its main water inlet valve malfunctions and requires maintenance, the other main water inlet pipe can continue to supply cooling water to the centrifuge body, ensuring uninterrupted cooling and improving system reliability and ease of maintenance. Each main water inlet pipe is equipped with an independent bypass water pipe. The two bypass water pipes can work together to adjust the flow rate, increasing the range of cooling flow rate adjustment and making the flow rate adjustment process smoother. This further reduces pipeline pressure fluctuations during adjustment and extends the service life of the tube molds.

[0026] The technical solution of the water-cooled centrifuge tube mold cooling method proposed in this invention is as follows: A method for cooling the tube mold of a water-cooled centrifuge is disclosed, employing a water-cooled centrifuge tube mold cooling system as described in any of the above technical solutions. This system includes a main inlet water pipe, a main inlet water switch valve, a centrifuge body, and a return water unit. The main inlet water switch valve is located on the main inlet water pipe. The inlet of the centrifuge body is connected to the main inlet water pipe, and the outlet of the centrifuge body is connected to the return water unit. A tube mold is installed inside the centrifuge body. The system also includes a bypass water pipe and a bypass regulating valve. The bypass regulating valve is located on the bypass water pipe. The inlet of the bypass water pipe is connected to the main inlet water pipe, and the outlet of the bypass water pipe is connected to the return water unit. The bypass regulating valve adjusts its opening to change the diversion flow rate of the bypass water pipe, thereby regulating the total flow rate of cooling water entering the centrifuge body. The method includes the following steps: When casting the centrifuge body, open the main inlet valve and close the bypass regulating valve to allow cooling water to enter the centrifuge body through the main inlet pipe for cooling. When molten iron is poured into the centrifuge body and a set time has elapsed, or when the temperature of the mold inside the centrifuge body drops to a set temperature value, the bypass regulating valve is opened to divert some of the cooling water through the bypass water pipe into the return water unit, thereby reducing the amount of cooling water input to the centrifuge body.

[0027] The beneficial effects of the water-cooled centrifuge tube mold cooling method are as follows: In the initial stage of the casting operation, the tube mold is cooled with full flow of cooling water to ensure the cooling and solidification efficiency of the molten iron. After the molten iron has been poured for a set time or the tube mold temperature has dropped to a set value, the cooling water volume is reduced by bypass regulating valve to gradually reduce the cooling intensity and avoid drastic fluctuations in tube mold temperature, effectively alleviating the thermal fatigue of the tube mold. At the same time, it supports two trigger adjustment methods, time and temperature, which can be adapted to different production conditions. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of Embodiment 1 of the water-cooled centrifuge tube mold cooling system of the present invention; Figure 2 This is a schematic diagram of Embodiment 2 of the water-cooled centrifuge tube mold cooling system of the present invention.

[0029] Explanation of reference numerals in the attached figures: 1. Main inlet water pipe; 2. Main inlet water switch valve; 3. Return water tank; 4. Return water pipe; 5. Centrifuge body; 6. Tube mold; 7. Bypass water pipe; 8. Cooling water pump; 9. Bypass regulating valve; 10. Cooling water tank. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] Example 1 of a water-cooled centrifuge tube mold cooling system: like Figure 1 As shown, the water-cooled centrifuge tube mold cooling system is applied to the centrifugal casting production process of ductile iron pipes. It is used to control the water cooling of the tube mold 6 inside the centrifuge. The whole system includes a main water inlet pipe 1, a main water inlet switch valve 2, a centrifuge body 5, a return water unit, a cooling water pump 8, a bypass water pipe 7, a bypass regulating valve 9, and a control unit.

[0032] The main water inlet pipe 1 is connected to the outlet of the cooling water pump 8, and the inlet of the cooling water pump 8 is connected to the return water unit. The cooling water circulates along the pipeline under the drive of the cooling water pump 8 to complete the cooling cycle of the pipe mold 6.

[0033] The main inlet valve 2 is installed on a section of the main inlet pipe 1. In this embodiment, the main inlet valve 2 is a pneumatic valve with only two working states: fully open and fully closed. It is used to control the flow of water from the main inlet pipe 1 to the centrifuge body 5. The main inlet valve 2 uses compressed air as its power source, which has a fast response speed and can adapt to the timing switching requirements of pouring operations. At the same time, the pneumatic drive has good vibration resistance and environmental resistance, making it suitable for the humid and vibrating conditions at the centrifuge site.

[0034] The inlet of the centrifuge body 5 is connected to the main inlet pipe 1 downstream of the main inlet valve 2, and the outlet of the centrifuge body 5 is connected to the return water unit. A tube mold 6 is installed inside the centrifuge body 5; the tube mold 6 is a centrifugal casting mold for ductile iron pipes. A cooling chamber is arranged around the outer wall of the tube mold 6 inside the centrifuge body 5. After entering the cooling chamber, cooling water exchanges heat with the outer wall of the tube mold 6, carrying away the heat transferred by the tube mold 6, thus cooling the tube mold 6. When the tube mold 6 rotates at high speed with the centrifuge, the molten iron on the inner wall is formed under the action of centrifugal force, while the outer wall is continuously cooled by the cooling water to complete solidification.

[0035] The return water unit includes a return water pipe 4 and a return water tank 3. The outlet of the centrifuge body 5 is connected to the return water tank 3 through the return water pipe 4. The high-temperature cooling water that has completed heat exchange flows into the return water tank 3 through the return water pipe 4. In actual use, a cooling water tank 10 is installed to ensure the circulating cooling effect. In this case, the outlet of the return water pipe 4 is first connected to the inlet of the cooling water tank 10. The cooling water cooled by the cooling water tank 10 then flows into the return water tank 3, so that the water temperature in the return water tank 3 is maintained within a stable cooling temperature range, ensuring the circulating cooling effect.

[0036] The inlet of the bypass water pipe 7 is connected to the main inlet water pipe 1, with the connection point located upstream of the main inlet switch valve 2. The outlet of the bypass water pipe 7 is connected to the return water tank 3. A bypass regulating valve 9 is installed on the bypass water pipe 7. The bypass regulating valve 9 is a pneumatic proportional regulating valve, and its opening can be continuously adjusted according to a set ratio. By changing its own opening size, the bypass regulating valve 9 adjusts the diversion flow rate in the bypass water pipe 7, thereby changing the total flow rate of cooling water entering the centrifuge body 5 from the main inlet water pipe 1. In other embodiments, the bypass regulating valve 9 can also be an electric proportional regulating valve. The valve core is moved by an electrically controlled drive mechanism to achieve continuous adjustment of the opening, which can also control the diversion flow rate of the bypass water pipe 7 and complete the smooth adjustment of the cooling water volume. In this case, a corresponding protective device can be installed on the outside of the electric proportional regulating valve to adapt to the harsh working environment of the centrifuge.

[0037] In this embodiment, the bypass pipeline adopts an upstream water intake arrangement. When the main inlet valve 2 is closed, the water continuously output by the cooling water pump 8 can be discharged back to the water tank 3 through the bypass water pipeline 7, avoiding pressure buildup in the pipeline that could damage the cooling water pump 8 and the sealing components. In other embodiments, the connection point between the bypass water pipeline 7 and the main inlet pipeline 1 can also be located downstream of the main inlet valve 2. The bypass regulating valve 9 can also change the total flow rate of cooling water entering the centrifuge body 5 by adjusting the diversion flow rate of the downstream branch, thus fulfilling the basic function of diversion regulation.

[0038] The control unit is connected to the main water inlet switch valve 2 and the bypass regulating valve 9 respectively. The control unit can store preset pouring timing parameters and temperature thresholds. It can output corresponding control commands to each valve according to the production conditions to control the on / off state of the main water inlet switch valve 2 and the opening degree of the bypass regulating valve 9.

[0039] The cooling process of the water-cooled centrifuge tube mold cooling system of the present invention is as follows: The control unit outputs a control command to open the main inlet valve 2, while simultaneously controlling the bypass regulating valve 9 to remain fully closed. The cooling water pump 8 draws cooling water from the return water tank 3 and sends it all into the cooling chamber of the centrifuge body 5 through the main inlet pipe 1 to pre-cool the tube mold 6. During the initial solidification stage after the molten iron is poured into the tube mold 6, the control unit maintains the bypass regulating valve 9 fully closed, and the cooling water forces the tube mold 6 to solidify at full flow, ensuring rapid solidification of the molten iron. When the molten iron pouring has passed the set time, or when the temperature of the tube mold 6 drops to the set temperature value, the control unit outputs a continuously changing control signal to the bypass regulating valve 9, driving the bypass regulating valve 9 to gradually open. The opening degree increases proportionally, and some of the cooling water is directly diverted back to the water tank 3 through the bypass water pipe 7. The flow rate of cooling water entering the centrifuge body 5 then gradually decreases, and the cooling intensity received by the tube mold 6 gradually decreases. Throughout the adjustment process, the overall pressure of the main water inlet pipe 1 remains stable without drastic pressure fluctuations. The temperature of the mold 6 decreases steadily, avoiding thermal fatigue damage caused by sudden temperature changes. This extends the life of the mold 6 and prevents porosity on the surface of the cast ductile iron pipe due to excessively low temperature during the next casting, which would affect the appearance quality. If the bypass regulating valve 9 malfunctions and cannot adjust normally, the main water inlet pipe 1 can still continuously supply cooling water to the centrifuge body 5 to maintain basic cooling capacity, preventing overheating and damage to the mold 6 due to water interruption.

[0040] It should be noted that the set time and set temperature values ​​can be obtained by matching the production conditions through process calibration, and used as the trigger for opening the bypass regulating valve 9.

[0041] Specifically, the set time is obtained as follows: For ductile iron pipes of specific specifications and their corresponding molds 6, multiple sets of pouring and cooling verification tests are conducted. Starting from the moment the molten iron is poured into the mold 6, the temperature change process of the outer wall of the mold 6 is continuously tracked to confirm the pouring time corresponding to the completion of molten iron solidification and the mold temperature entering a suitable slow cooling range. This time is determined as the set time for the corresponding product specification and pre-stored in the storage module inside the control unit. During formal production, the control unit retrieves the corresponding set time according to the currently produced pipe specification. The timing is started synchronously after the pouring action is triggered. When the time reaches the set time, the control unit outputs a command to open the bypass regulating valve 9, entering the slow cooling control stage. For pipe products with different diameters and wall thicknesses, calibration can be completed separately to form corresponding process parameter sets, which can be directly matched and called during production to adapt to the production needs of multiple product specifications.

[0042] The method for obtaining the set temperature value is as follows: First, based on the material properties and thermal fatigue control requirements of the tube mold 6, the optimal outer wall temperature range for the tube mold 6 to enter the slow cooling stage is determined. The critical temperature corresponding to this range is then set as the set temperature value and pre-stored in the control unit. A temperature detection component is installed at the position on the outer wall of the tube mold 6 corresponding to the centrifuge body 5. The temperature detection component is connected to the control unit and can collect the actual temperature of the outer wall of the tube mold in real time. During formal production, the temperature detection component continuously transmits the collected real-time temperature data to the control unit. When the tube mold temperature is detected to drop to the set temperature value, the control unit outputs a command to open the bypass regulating valve 9 and initiate the slow cooling regulation process. The temperature detection component adopts a non-contact temperature measurement method, which is suitable for the high-speed rotation of the tube mold 6 and can stably obtain the temperature data of the surface of the tube mold 6, ensuring the accuracy of the triggering node.

[0043] Example 2 of a water-cooled centrifuge tube mold cooling system: like Figure 2 As shown, the only difference between this embodiment and Embodiment 1 above is that in this embodiment, two bypass regulating valves 9 are installed on the same bypass water pipe 7. The two bypass regulating valves 9 are arranged in parallel, with one serving as the main regulating valve and the other as the backup regulating valve. The structure, position, and connection relationship of the remaining components are the same as in Embodiment 1 above, and will not be described in detail here.

[0044] Both bypass regulating valves 9 are pneumatic proportional regulating valves, each capable of independently performing continuous proportional adjustment of their opening. Under normal operating conditions, the control unit outputs a fully closed command to the standby regulating valve, keeping it closed. Simultaneously, it outputs a regulating control signal to the main regulating valve, which then handles the bypass flow regulation, adjusting its opening according to the pouring sequence and temperature requirements to control the magnitude of the diverted flow. When the control unit detects a malfunction in the main regulating valve, such as jamming or leakage, it immediately cuts off the control signal to the main regulating valve and simultaneously outputs a corresponding opening control command to the standby regulating valve, causing it to automatically switch to operating mode and continue the flow regulation task, ensuring uninterrupted cooling regulation.

[0045] Example 3 of a water-cooled centrifuge tube mold cooling system: The difference between this embodiment and the above embodiment 1 is that: in this embodiment, the main water inlet pipe 1 is provided with two paths, the output ends of the two main water inlet pipes 1 are respectively connected to the water inlet of the centrifuge body 5, and each main water inlet pipe 1 is connected to a bypass water pipe 7, and each bypass water pipe 7 is provided with a bypass regulating valve 9.

[0046] The inlet ends of the two main water inlet pipes 1 are connected to the main outlet pipe of the cooling water pump 8. Each main water inlet pipe 1 is equipped with a main water inlet switch valve 2, and each main water inlet switch valve 2 is signal-connected to the control unit, which independently controls its on / off state. Each main water inlet pipe 1 is connected in parallel to a bypass water pipe 7, and each bypass water pipe 7 is equipped with a bypass regulating valve 9. Each bypass regulating valve 9 is signal-connected to the control unit, which can synchronously or independently adjust the opening degree of each bypass regulating valve 9. The outlet ends of both bypass water pipes 7 are connected to the return water tank 3 of the return water unit.

[0047] The working process of this embodiment is basically the same as that of Embodiment 1. Under normal operating conditions, the control unit controls the two main inlet water valves 2 to open synchronously, and the two bypass regulating valves 9 to adjust their openings synchronously. Cooling water is simultaneously sent into the centrifuge body 5 through the two main inlet water pipes 1, entering the cooling chamber from different positions, making the cooling water flow field distribution more uniform and improving the uniformity of cooling of the tube mold 6. The two regulating valves work together to adjust the diversion flow rate, which can widen the adjustment range of the cooling flow rate, make the flow rate change process smoother, and further reduce the pipeline pressure fluctuation during the adjustment process.

[0048] When one of the main water inlet pipes 1 or its corresponding valves needs maintenance, the control unit can close the main water inlet switch valve 2 and the bypass regulating valve 9 of that line, allowing the other main water inlet pipe 1 to independently complete the water supply and flow regulation functions, maintaining the continuous operation of the cooling system without shutting down the entire machine, thus improving the reliability of the system operation and the convenience of maintenance.

[0049] An embodiment of the water-cooled centrifuge tube mold cooling method proposed in this invention: The water-cooled centrifuge tube mold cooling method, implemented using the water-cooled centrifuge tube mold cooling system described in the above embodiments, includes the following steps: When casting the centrifuge body 5, open the main water inlet valve 2 and close the bypass regulating valve 9 so that cooling water can be input into the centrifuge body 5 through the main water inlet pipe 1 for cooling. Molten iron is poured into the centrifuge body 5 and a set time is elapsed; or when the temperature of the tube mold 6 inside the centrifuge body 5 drops to a set temperature value, the bypass regulating valve 9 is opened to divert some of the cooling water through the bypass water pipe 7 into the return water unit, thereby reducing the amount of cooling water input to the centrifuge body 5.

[0050] While various embodiments of the invention have been shown and described in this specification, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the invention.

Claims

1. A water-cooled centrifuge tube mold cooling system, comprising a main water inlet pipe, a main water inlet switch valve, a centrifuge body, and a return water unit, wherein the main water inlet switch valve is disposed on the main water inlet pipe; the water inlet of the centrifuge body is connected to the main water inlet pipe, the water outlet of the centrifuge body is connected to the return water unit, and a tube mold is disposed inside the centrifuge body, characterized in that, It also includes a bypass water pipe and a bypass regulating valve, with the bypass regulating valve installed on the bypass water pipe; the inlet end of the bypass water pipe is connected to the main inlet water pipe, and the outlet end of the bypass water pipe is connected to the return water unit; the bypass regulating valve changes the diversion flow rate of the bypass water pipe by adjusting its own opening, so as to regulate the total flow rate of cooling water entering the centrifuge body.

2. The water-cooled centrifuge tube mold cooling system according to claim 1, characterized in that, The bypass regulating valve is a pneumatic proportional regulating valve, and the opening degree of the pneumatic proportional regulating valve is continuously adjusted according to a set ratio.

3. The water-cooled centrifuge tube mold cooling system according to claim 2, characterized in that, Two bypass regulating valves are installed on the same bypass water pipeline. The two bypass regulating valves are arranged in parallel. One of the two bypass regulating valves serves as the main regulating valve, and the other serves as the standby regulating valve.

4. The water-cooled centrifuge tube mold cooling system according to claim 2, characterized in that, The bypass water pipe is connected to the main water inlet pipe upstream of the main water inlet switch valve.

5. A water-cooled centrifuge tube mold cooling system according to any one of claims 1-4, characterized in that, The main inlet valve is a pneumatic valve.

6. A water-cooled centrifuge tube mold cooling system according to any one of claims 1-4, characterized in that, The water return unit includes a water return pipe and a water return tank. The outlet of the centrifuge body is connected to the water return tank through the water return pipe, and the other end of the bypass water pipe is connected to the water return tank.

7. A water-cooled centrifuge tube mold cooling system according to claim 6, characterized in that, The water return unit also includes a cooling water tank, with the outlet of the water return pipe connected to the inlet of the cooling water tank, and the outlet of the cooling water tank connected to the inlet of the water return pool.

8. The water-cooled centrifuge tube mold cooling system according to claim 1, characterized in that, The tube mold is a tube mold used for centrifugal casting of ductile iron pipes.

9. A water-cooled centrifuge tube mold cooling system according to claim 1, characterized in that, The main water inlet pipe has two branches, and the output ends of the two main water inlet pipes are respectively connected to the water inlet of the centrifuge body. Each main water inlet pipe is connected to a bypass water pipe, and each bypass water pipe is equipped with the bypass regulating valve.

10. A method for cooling the tube mold of a water-cooled centrifuge, characterized in that, The cooling system for a water-cooled centrifuge tube mold, as described in any one of claims 1-9, includes the following steps: When casting the centrifuge body, open the main inlet valve and close the bypass regulating valve to allow cooling water to enter the centrifuge body through the main inlet pipe for cooling. When molten iron is poured into the centrifuge body and a set time has elapsed, or when the temperature of the mold inside the centrifuge body drops to a set temperature value, the bypass regulating valve is opened to divert some of the cooling water through the bypass water pipe into the return water unit, thereby reducing the amount of cooling water input to the centrifuge body.

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