Grinding water supply system and method

Abstract

The invention provides a grinding water supply system and method, belongs to the technical field of machining, and is used for solving the technical problems of violent pressure fluctuation of a workshop main pipe network and large pressure difference between the head end and the tail end caused by dynamic water use in the prior art. Comprising a water supply pool, a main pipe, a water using branch and a water supply branch, the main pipe is connected to the water supply pool through the water supply branch and the first water pump, the water supply branch is connected between the main pipe and the grinding machine line, the main pipe is provided with a water pressure sensor, and the first water pump adjusts water pumping power according to a detection value of the water pressure sensor and a preset target value. The device has the technical effects that the pressure of the whole line is balanced and stable, the grinding quality is guaranteed and the energy consumption is obviously reduced.

Description

Technical Field

[0001] This invention relates to the field of machining technology, specifically to a water supply system and method for grinding. Background Technology

[0002] In machinery manufacturing workshops, especially grinding workshops, there are usually multiple grinding machine production lines. These grinding machines require a continuous, stable, and high-flow-rate coolant or cleaning fluid for cooling and rinsing during the processing. The traditional water supply method often uses a main water supply pipeline that draws water from a water tank and runs through the workshop, with each production line drawing water from the nearest branch of this main pipeline.

[0003] This water supply method has significant drawbacks: when multiple production lines start up simultaneously or when large amounts of water are used, the flow rate in the main pipeline increases dramatically, leading to a substantial increase in head loss along the pipeline. This results in insufficient water pressure for production lines far from the first water pump or located at the end of the main pipeline, affecting the normal processing and cooling effect of the grinding machines. Conversely, when water consumption decreases, the pressure near the pipeline becomes too high, affecting the stable operation of the grinding machines.

[0004] Existing solutions typically involve simply selecting a first pump with a higher head, but this results in the system operating under conditions of "overpowered power," leading to consistently high near-end pressure, enormous energy consumption, and an inability to resolve dynamic fluctuation issues. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention proposes a grinding process water supply system and method to solve the technical problems of drastic pressure fluctuations and large pressure differences between the beginning and end of the main pipeline network in the workshop caused by dynamic water usage.

[0006] The technical solution adopted in this invention is a grinding water supply system and method.

[0007] One grinding water supply system includes: a water supply tank, a main pipe, water supply branches, and water supply branches; the main pipe is connected to the water supply tank through water supply branches and a first water pump, the water supply branches are connected between the main pipe and the grinding line, the main pipe is equipped with a water pressure sensor, and the first water pump adjusts its pumping power according to the detection value of the water pressure sensor and a preset target value.

[0008] Optionally, the main pipe is arranged horizontally, and multiple water supply branches are connected to the middle area of ​​the main pipe, with the multiple water supply branches distributed along the length of the main pipe.

[0009] Optionally, the water pressure sensor includes an end-side sensor located at the end of the main pipe and an intermediate sensor located in the middle of the main pipe.

[0010] Optionally, each end of the main pipe is provided with a pressure compensation branch, which includes a second water pump and a pipe end plug. The second water pump draws water from the water supply tank and connects to the end of the main pipe through the pipe end plug.

[0011] Optionally, the pipe end plugging device includes a plugging body, a sealing membrane, an elastic ring, and a fluid passage; the plugging body has a concave annular groove at one end inserted into the main pipe, and a convex ring at the outer end of the concave annular groove, the outer surface of the convex ring fitting with the inner surface of the main pipe, and an isobaric channel for communication between the concave annular groove and the inside of the main pipe is provided on the inner side of the convex ring; the elastic ring is fitted onto the plugging body, the sealing membrane is tubular and elastic, one end of the sealing membrane is connected to the end of the concave annular groove away from the convex ring, and the other end is connected to the elastic ring, the elastic ring having at least two states of being connected to the left and right sides of the concave annular groove; the fluid passage is located in the central region of the plugging body.

[0012] Optionally, both sides of the concave annular groove are provided with positioning annular grooves for limiting the elastic ring. The diameter of the positioning annular groove located at the inner end of the main pipe is larger than that of the positioning annular groove on the other side. The end face of the convex ring facing the tail end of the sealing body is provided with a guide post.

[0013] Optionally, the outer ring of the convex ring is tapered, with the diameter of one end facing the inside of the main pipe being larger than the diameter of the other end; the guide post is also tapered, and the direction of the tapering is consistent with that of the outer ring of the convex ring.

[0014] Optionally, the fluid passage includes a channel tube, an elastic element, and a self-opening and closing piston; the self-opening and closing piston and the channel tube are connected by a conical surface, the elastic element is disposed between the channel tube and the self-opening and closing piston, and the self-opening and closing piston can adaptively adjust its position according to the pressure difference between the two ends of the channel tube.

[0015] Optionally, the elastic ring is provided with a buckle structure, and after the cable passes through the buckle structure, both ends are led out from the channel tube to the outside.

[0016] One method for a grinding process water supply system, employing the grinding process water supply system described above, includes the following steps: Obtain the preset target pressure value for the middle area of ​​the main pipeline, and supply water to the branch pipelines according to the target pressure value; Obtain the actual water pressure values ​​at the middle and both ends of the main pipe. Once the actual water pressure values ​​reach the preset target pressure value, connect the water supply branches as needed. The actual water pressure values ​​at the middle and both ends of the main pipe are continuously obtained. The water supply branch adjusts the water supply power according to the actual water pressure value at the middle, and the pressure compensation branch at both ends of the main pipe adjusts the water supply power according to the actual water pressure values ​​at both ends.

[0017] As can be seen from the above technical solution, the beneficial technical effects of the present invention are as follows: Compared to existing technologies, this invention achieves dynamic and precise control of pipeline pressure by constructing a power regulation closed loop based on real-time water pressure feedback between the water pump and the main pipeline. This system proactively responds to flow changes caused by the start and stop of grinding machines, effectively suppressing pressure fluctuations and pressure differences between the beginning and end points, ensuring a continuous and stable coolant supply to each grinding machine branch, thereby significantly improving the consistency of processing quality. Simultaneously, the water pump power is matched to actual demand, fundamentally overcoming the energy waste problem of "overpowered pumps for underpowered applications," achieving significant energy-saving and consumption-reducing effects. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the overall system layout.

[0020] Figure 2 This is a three-dimensional sectional view of the pipe end plug.

[0021] Figure 3 This is a schematic diagram of a cross-section of the pipe end plug.

[0022] Figure 4 for Figure 3 A schematic diagram of state 1 at point A in the middle.

[0023] Figure 5 for Figure 3 Schematic diagram of state two at point A in the middle.

[0024] Reference numerals in the attached drawings: 1. Water supply tank; 2. Main pipe; 3. Water supply branch; 4. First water pump; 41. Grinding line; 5. Water pressure sensor; 6. Pressure compensation branch; 7. Second water pump; 71. Pipe end plug; 72. Plug body; 721. Concave annular groove; 7211. Convex ring; 7212. Isobaric channel; 7213. Positioning annular groove; 7214. Guide post; 7215. Sealing membrane; 722. Elastic ring; 723. Buckle structure; 7231. Cable; 7232. Fluid passage; 724. Elastic element; 7241. Self-opening and closing piston; 7242. Detailed Implementation

[0025] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0026] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0027] One type of grinding water supply system is described in the appendix. Figure 1 One possible implementation includes: a water supply tank 1, a main pipe 2, water supply branch lines 3 and 4; the main pipe 2 is connected to the water supply tank 1 via the water supply branch lines 4 and a first water pump 41; the water supply branch lines 3 connect the main pipe 2 and the grinding line 5; the main pipe 2 is equipped with a water pressure sensor 6; the first water pump 41 adjusts its pumping power according to the detection value of the water pressure sensor 6 and a preset target value. The grinding line 5 refers to a grinding machine processing production line, each with multiple workstations, each requiring water for cooling or rinsing. Due to differences in processing technology within each line, the water consumption of each grinding line 5 varies.

[0028] In a more specific embodiment, the main pipe 2 is horizontally positioned within the grinding machine workshop, intentionally with a slight inclination angle, for example, a drop of 1-5 mm between the two ends. This is to prevent water accumulation inside the pipe when it is emptied. Multiple water supply branches 4 are connected to the middle area of ​​the main pipe 2, and multiple water supply branches 3 are distributed along the length of the main pipe 2. Typically, the main pipe 2 is arranged along one wall of the workshop, and the water supply branches 4 draw water from the main pipe 2 according to the location of each grinding machine line 5. The water pressure sensor 6 includes an end-side sensor located at one end of the main pipe 2 and a middle sensor located in the middle of the main pipe 2.

[0029] In actual operation, the end-side sensors and intermediate sensors work together. The end-side sensors monitor the water pressure at the end of the main pipe in real time, while the intermediate sensors monitor the water pressure in the middle of the main pipe, which is also the area connected to the water tank pump. When the end-side sensor detects that the water pressure is lower than the preset target value, it indicates that the water demand of the grinding line is high, possibly because some workstations have activated their water-using equipment. At this time, the first water pump will automatically increase its pumping power based on the detection value of the end-side sensor to ensure that the main pipe has sufficient water pressure to supply water to the grinding line. When the intermediate sensor detects abnormal water pressure, it may be due to a partial blockage in the water supply branch or water-using branch. The system will promptly issue an alarm to remind the staff to carry out maintenance.

[0030] Meanwhile, the water supply tank 1 is also equipped with a water level monitoring device 8. The water level monitoring device 8 can monitor the water level in the water supply tank in real time. When the water level is lower than the set minimum water level, the system will automatically replenish water from an external water source to ensure that the water supply tank has sufficient water to supply the grinding line. When the water level reaches the set maximum water level, the external water intake will automatically stop to prevent water from overflowing.

[0031] In the above embodiment, due to the numerous connection points between the water branch 3 and the main pipe 2, and the significant differences in water usage, the internal water pressure is dynamic. The pressure is high in the central water supply area and low at the ends. To ensure that the water pressure in the ends meets the requirements, the water pressure in the central area will be higher than the required pressure. This leads to two problems: an imbalance in water pressure within the main pipe 2 and energy waste in the first water pump 41. Specifically, due to the pressure difference between the central and end areas, the water flow in the main pipe generates unnecessary turbulence and eddies under the influence of the high pressure difference. These abnormal water flow movements not only accelerate pipe wear, shorten pipe lifespan, and increase maintenance costs, but also cause additional energy loss. Furthermore, to maintain the water pressure in both ends, the first water pump must maintain a higher pressure in the central area, requiring continuous operation at a higher power, even when the water demand in the end areas is low. This undoubtedly results in a significant waste of electrical energy and increases operating costs.

[0032] In one possible implementation, see Appendix Figure 1 Each end of the main pipe 2 is equipped with a pressure compensation branch 7, which includes a second water pump 71 and a pipe end sealer 72. The second water pump 71 draws water from the water supply tank 1 and connects to the end of the main pipe 2 through the pipe end sealer 72. In this embodiment, the middle section of the main pipe 2 always operates at a preset target pressure value, without considering pressure compensation in the low-pressure areas at both ends. Because the pressure drop in the low-pressure areas at both ends is compensated by the pressure compensation branch 7, and since it only needs to provide pressure compensation rather than providing a base pressure difference, the power of the second water pump 71 can be much smaller, and the energy consumption can also be much lower.

[0033] This approach solves two main problems. First, it addresses the issue of water pressure imbalance within the main pipe. The pressure compensation branch precisely replenishes pressure in the low-pressure areas at both ends, balancing the water pressure throughout the main pipe. This reduces turbulence and eddies caused by pressure differences, slows pipe wear, extends pipe lifespan, and consequently reduces maintenance costs. Second, it significantly reduces energy consumption. The first pump no longer needs to maintain excessively high pressure in the middle area to keep the pressure at both ends high; it can operate stably at the preset target pressure value. The pressure at both ends is compensated by the lower-powered second pump, avoiding unnecessary high-power operation of the first pump, greatly reducing energy waste and effectively lowering operating costs.

[0034] Furthermore, the pipe end plugs play a crucial role. They allow for flexible control of the connection and disconnection between the pressure compensation branch and the main pipe end, adjusting according to actual water demand and pressure conditions. When water demand increases and pressure drops at both ends, the pressure compensation function is activated promptly; conversely, when water demand is low, compensation can be reduced or even stopped, achieving more precise pressure control and energy management. Moreover, this pressure compensation branch design boasts strong adaptability and scalability. For grinding mill water supply systems of varying scales and water demands, actual needs can be met by adjusting the power of the second pump and the pressure compensation parameters, demonstrating promising application prospects.

[0035] Specifically, in one possible implementation, see Appendix Figure 2 The pipe end plugging device 72 includes a plugging body 721, a sealing membrane 722, an elastic ring 723, and a fluid passage 724. One end of the plugging body 721 inserted into the main pipe 2 has an inner concave annular groove 7211, and a convex ring 7212 is provided at the outer end of the inner concave annular groove 7211. The outer surface of the convex ring 7212 mates with the inner surface of the main pipe 2. The outer surface of the convex ring 7212 is made of rubber, providing a certain sealing effect. An equal pressure channel 7213 is provided inside the convex ring 7212 to allow communication between the inner concave annular groove 7211 and the inside of the main pipe 2. The elastic ring 723 is fitted onto the plugging body 721. The sealing membrane 722 is tubular and elastic. One end of the sealing membrane 722 is connected to the end of the inner concave annular groove 7211 away from the convex ring 7212, and the other end is connected to the elastic ring 723. The elastic ring 723 includes at least one end connected to the left side of the inner concave annular groove 7211 (…). Figure 4 ) and the right side ( Figure 5 There are two states; the fluid passage 724 is located in the central region of the plug 721.

[0036] Furthermore, in one possible implementation, see Appendix Figure 2 Both sides of the concave annular groove 7211 are provided with positioning annular grooves 7214 for limiting the elastic ring 723. The diameter of the positioning annular groove 7214 located at the inner end of the main pipe 2 is larger than that of the positioning annular groove 7214 on the other side. When the elastic ring 723 is moved from the inner end of the main pipe 2, the positioning annular groove 7214 is located at the inner end of the main pipe 2. Figure 2 When the left positioning ring groove 7214 is pushed into the right positioning ring groove 7214, the elastic ring 723 is stretched due to its larger diameter, resulting in better engagement with the convex ring 7212 and increased sealing. A guide post 7215 is provided on the end face of the convex ring 7212 facing the tail end of the sealing body 721 to ensure accurate pushing of the elastic ring 723 from the left positioning ring groove 7214 into the right positioning ring groove 7214. Furthermore, the outer ring of the convex ring 7212 is tapered, with the diameter at one end facing the inside of the main pipe 2 being larger than the diameter at the other end; the guide post 7215 is also tapered, with the tapered direction consistent with the outer ring of the convex ring 7212. The tapering serves as a guide and leaves space on the inner surface of the main pipe 2, allowing the elastic ring 723 to be pushed from the left positioning ring groove 7214 into the right positioning ring groove 7214. Figure 2 When the left positioning ring groove 7214 is pushed into the right positioning ring groove 7214, the elastic ring 723 is inserted between the main pipe 2 and the convex ring 7212, and at the same time, it pulls the sealing film 722 to cover the outer periphery of the concave ring groove 7211 and stick to the inner surface of the main pipe 2.

[0037] When pressure is generated inside the pipe, liquid rapidly fills the concave annular groove 7211 through the isobaric channel 7213, forming a dynamic pressure feedback chamber. The lateral pressure of the liquid acts perpendicularly on the inner surface of the sealing membrane 722, generating a radial expansion force that evenly presses the sealing membrane 722 against the inner surface of the main pipe 2, forming a "pressure-sealing force" positive feedback mechanism—for every slight increase in water pressure inside the pipe, the sealing contact pressure also increases accordingly, achieving a self-sealing characteristic where the sealing effect increases with the water pressure. To counteract the axial thrust generated by the pressure, multiple circumferentially distributed through holes are pre-set at the end of the main pipe 2, and the main pipe 2 is rigidly fastened to the sealing body 721 with high-strength bolts to ensure no displacement risk under extreme working conditions.

[0038] In one possible implementation, see Appendix Figure 4 and Figure 5 The elastic ring 723 has a buckle structure 7231. After the pull cable 7232 passes through the buckle structure 7231, both ends are led out from the channel pipe to the outside. Initially, that is, before the pipe end plug 72 is installed into the main pipe 2, the elastic ring 723 is in the contracted state of the left positioning ring groove 7214 (the diameter is smaller than that of the right side). This design avoids insertion resistance by reducing the radial volume and prevents the elastic ring 723 from shifting or deforming due to friction on the inner wall of the main pipe 2, ensuring that the sealing film 722 remains folded and stored during installation. After the pipe end plug 72 is inserted into the main pipe 2, the elastic ring 723 is pulled from the left positioning ring groove 7214 into the right positioning ring groove 7214 by the pull cable 7232, completing the conversion from the contracted state to the working state. The installation process is as follows: after the pipe end plug 72 is inserted into the main pipe 2 and tightened with bolts, the two ends of the same pull cable 7232 are pulled to make the elastic ring 723 slide from the left positioning ring groove 7214 into the right positioning ring groove 7214. Figure 2 The left positioning ring groove 7214 slides into the right positioning ring groove 7214. Once in place, pull one end of the cable 7232 to remove the cable 7232.

[0039] In practical applications, the pipe end plug 72 of this grinding water supply system effectively prevents liquid leakage at the end of the main pipe 2, ensuring the normal operation of the entire water supply system. Whether in daily grinding production or during system maintenance and repair, the pipe end plug 72 plays a crucial role, improving the system's reliability and safety. Simultaneously, its relatively simple structure and operation reduce the difficulty and labor intensity for operators, improving work efficiency.

[0040] In one possible implementation, see Appendix Figure 2The fluid passage 724 includes a channel pipe, an elastic element 7241, and a self-closing piston 7242. The self-closing piston 7242 and the channel pipe are connected by a conical surface fit. The elastic element 7241 is located between the channel pipe and the self-closing piston 7242. The self-closing piston 7242 can adaptively adjust its position according to the pressure difference across the two ends of the channel pipe. The self-closing piston 7242 is jointly controlled by the elastic force of the elastic element 7241 under the pressure difference. The conical surface fit also has the effect of preventing backflow.

[0041] To simplify the control system, both the first water pump 41 and the second water pump can supply water according to the target pressure. At the end of the main pipe 2, insufficient pressure manifests as a decrease in pressure at the inlet end of the fluid passage 724 in the channel pipe. Figure 2 (Left) Pressure is higher than at the outlet end ( Figure 2 When the pressure reaches a certain value, the pressure difference overcomes the elastic force of the elastic element 7241, pushing the self-closing piston 7242 towards the outlet. At this time, the fluid passage 724 opens, allowing the liquid to pass smoothly through the channel pipe and replenish the water supply system for grinding. When the pressure at the inlet decreases or the pressure at the outlet increases, making the pressure difference insufficient to overcome the elastic force of the elastic element 7241, the elastic element 7241 and the main pipe 2 will push the self-closing piston 7242 until it is tightly engaged with the channel pipe, closing the fluid passage 724 and preventing liquid backflow.

[0042] This adaptive adjustment method enables the grinding water supply system to automatically control fluid flow based on actual pressure conditions, further improving system stability and reliability. During actual operation, pressure fluctuations may occur, and the adaptive adjustment function of the self-opening piston 7242 effectively handles these fluctuations, ensuring the system remains in a stable operating state. Simultaneously, the anti-backflow effect of the conical surface provides additional protection for the system's normal operation, avoiding potential equipment damage and abnormal water supply caused by liquid backflow.

[0043] One possible implementation of a grinding process water supply system method is as follows: The grinding process water supply system described above includes the following steps: Obtain the preset target pressure value for the middle area of ​​the main pipe 2, and supply water to the water supply branch 4 according to the target pressure value; Obtain the actual water pressure values ​​at the middle and both ends of the main pipe 2. Once the actual water pressure values ​​reach the preset target pressure values, connect the water branch 3 to use water as needed. The actual water pressure values ​​at the middle and both ends of the main pipe 2 are continuously obtained. The water supply branch 4 adjusts the water supply power according to the actual water pressure value at the middle. The pressure compensation branch 7 at both ends of the main pipe 2 adjusts the water supply power according to the actual water pressure values ​​at both ends.

[0044] Throughout the water supply process, the pressure changes in each section of the main pipe 2 are monitored in real time. If the actual water pressure in the middle deviates from the preset target pressure value, the water supply branch 4 will precisely adjust the water supply power according to the degree and direction of the deviation. When the actual water pressure is higher than the preset target pressure value, the water supply branch 4 will appropriately reduce the water supply power to avoid damage to the system due to excessive pressure; if the actual water pressure is lower than the preset target pressure value, the water supply branch 4 will correspondingly increase the water supply power to ensure stable system pressure.

[0045] For the pressure compensation branches 7 at both ends of the main pipe 2, they are also carefully adjusted according to the actual water pressure values ​​at both ends. When the actual water pressure values ​​at both ends fluctuate, the pressure compensation branches 7 react quickly. If the pressure at one end is too low, the pressure compensation branch 7 at that end increases the water supply power to supplement the pressure; if the pressure at one end is too high, the pressure compensation branch 7 reduces the water supply power to prevent the excessive pressure from impacting the system.

[0046] After water supply branch 3 is connected and water is used as needed, its water usage is continuously monitored. If the water consumption of water supply branch 3 changes, thereby affecting the pressure distribution of the main pipe 2, water supply branch 4 and pressure compensation branch 7 will adjust the water supply power again according to the actual situation to maintain the system pressure balance. At the same time, the system will also monitor the operating status of each branch in real time. Once an abnormality is detected, such as abnormal pressure fluctuations or abnormal water supply power in a branch, an alarm signal will be issued immediately to remind staff to check and maintain, ensuring that the grinding water supply system can operate continuously, stably, and reliably.

[0047] 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, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A water supply system for grinding processes, characterized in that, include: Water supply tank (1), main pipe (2), water supply branch (3) and water supply branch (4); the main pipe (2) is connected to the water supply tank (1) through the water supply branch (4) and the first water pump (41), the water supply branch (3) is connected between the main pipe (2) and the grinding machine line (5), the main pipe (2) is equipped with a water pressure sensor (6), and the first water pump (41) adjusts the pumping power according to the detection value of the water pressure sensor (6) and the preset target value.

2. The grinding water supply system as described in claim 1, characterized in that: The multiple water supply branches (4) are connected to the middle area of ​​the main pipe (2), and the multiple water supply branches (3) are distributed along the length of the main pipe (2).

3. The grinding water supply system as described in claim 2, characterized in that: The water pressure sensor (6) includes an end-side sensor located at the end of the main pipe (2) and an intermediate sensor located in the middle of the main pipe (2).

4. A grinding water supply system as described in claim 2, characterized in that: Each end of the main pipe (2) is provided with a pressure compensation branch (7). The pressure compensation branch (7) includes a second water pump (71) and a pipe end plug (72). The second water pump (71) draws water from the water supply tank (1) and connects to the end of the main pipe (2) through the pipe end plug (72).

5. A grinding water supply system as described in claim 4, characterized in that: The pipe end plug (72) includes a plug body (721), a sealing membrane (722), an elastic ring (723), and a fluid passage (724); The sealing body (721) is inserted into the main pipe (2) at one end and has an inner concave annular groove (7211). The outer end of the inner concave annular groove (7211) has a convex ring (7212). The outer annular surface of the convex ring (7212) is engaged with the inner surface of the main pipe (2). The inner side of the convex ring (7212) has an isobaric channel (7213) for communicating between the inner concave annular groove (7211) and the inside of the main pipe (2). The elastic ring (723) is fitted onto the sealing body (721). The sealing membrane (722) is tubular and elastic. One end of the sealing membrane (722) is connected to the end of the concave annular groove (7211) away from the convex ring (7212), and the other end is connected to the elastic ring (723). The elastic ring (723) has at least two states: connected to the left side and the right side of the concave annular groove (7211). The fluid passage (724) is located in the central region of the plug (721).

6. A grinding water supply system as described in claim 5, characterized in that: Both sides of the concave annular groove (7211) are provided with positioning annular grooves (7214) for limiting the elastic ring (723). The positioning annular groove (7214) located on the inner end of the main pipe (2) has a larger diameter than the positioning annular groove (7214) on the other side. The end face of the convex ring (7212) facing the tail end of the sealing body (721) is provided with a guide post (7215).

7. A grinding water supply system as described in claim 6, characterized in that: The outer ring of the convex ring (7212) is tapered, and the diameter of one end facing the inside of the main pipe (2) is larger than the diameter of the other end; the guide post (7215) is also tapered, and the direction of the tapering is consistent with that of the outer ring of the convex ring (7212).

8. A grinding water supply system as described in claim 7, characterized in that: The fluid passage (724) includes a channel tube, an elastic element (7241), and a self-opening and closing piston (7242); the self-opening and closing piston (7242) and the channel tube are connected by a conical surface, the elastic element (7241) is disposed between the channel tube and the self-opening and closing piston (7242), and the self-opening and closing piston (7242) can adaptively adjust its position according to the pressure difference at both ends of the channel tube.

9. A grinding water supply system as described in claim 8, characterized in that: The elastic ring (723) is provided with a buckle structure (7231). After the cable (7232) passes through the buckle structure (7231), both ends are led out from the channel tube to the outside.

10. A method for a water supply system for grinding, characterized in that, The grinding water supply system as described in claim 8 includes the following steps: Obtain the preset target pressure value of the middle area of ​​the main pipe (2), and supply water to the branch pipe (4) according to the target pressure value; Obtain the actual water pressure values ​​at the middle and both ends of the main pipe (2). After the actual water pressure values ​​reach the preset target pressure value, connect the water branch (3) to use water as needed. The actual water pressure values ​​of the middle and both ends of the main pipe (2) are continuously obtained. The water supply branch (4) adjusts the water supply power according to the actual water pressure value in the middle. The pressure compensation branch (7) at both ends of the main pipe (2) adjusts the water supply power according to the actual water pressure values ​​at both ends.

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