Water circulation cooling system for mill cars

Abstract

This utility model discloses a water circulation cooling device for grinding mills, relating to the technical field of grinding mill cooling equipment. It includes: a base; a water faucet mechanism, a filtration and circulation mechanism, and an oil cooling mechanism mounted on the base; wherein the filtration and circulation mechanism includes a scrap recovery tank, a filter pipe located at the bottom of the scrap recovery tank and connected thereto, and the end of the filter pipe away from the scrap recovery tank being connected to the water faucet mechanism for recycling the filtered and separated grinding water. This utility model, through the process of rinsing the blades with the water faucet mechanism, utilizes the filtration and circulation mechanism and the oil cooling mechanism to achieve the filtration and separation of scrap and grinding wheel dust, as well as the circulation of cooled grinding water, thus ensuring the cleanliness of the grinding water during the closed-loop recycling process.

Description

Technical Field

[0001] This utility model relates to the technical field of mill cooling equipment, specifically a water circulation cooling device for mills. Background Technology

[0002] In the field of machining (especially after grinding or cutting), blade cleaning is a crucial post-processing step. Its main purpose is to remove residues adhering to the blade surface, such as iron filings (e.g., cutting blades, grinding wheel dressing blades, crusher blades, etc.) and grinding shavings (grinding wheel dust). However, existing blade cleaning methods mostly use grinding fluid, which requires a large amount of fresh grinding water to improve the cleaning efficiency. This method not only wastes grinding water but also generates a large amount of waste liquid.

[0003] In an effort to save water, some people repeatedly use grinding water. The impurities remaining in the grinding water and the high temperatures generated after grinding can significantly damage the precision of the cutting tools and the grinding wheel.

[0004] Therefore, a known water circulation cooling device for mill cars is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a water circulation cooling device for grinding wheels. This device achieves the filtration and separation of iron filings and grinding wheel dust, as well as the circulation of the cooled grinding water, by using a water faucet mechanism to rinse the blades and a filter circulation mechanism and an oil cooling mechanism. This achieves a closed-loop circulation of grinding water and ensures the cleanliness of the grinding water.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a grinding mill water circulation cooling device, comprising: a base; a water flushing faucet mechanism, a filtration and circulation mechanism, and an oil cooling mechanism disposed on the base. When the water flushing faucet mechanism washes away the grinding wheel dust and iron filings on the blades, the filtration and circulation mechanism and the oil cooling mechanism are respectively used for the recovery of grinding wheel dust and iron filings and the cooling of grinding water; wherein, the filtration and circulation mechanism includes an iron filings recovery pool, a filter pipe disposed at the bottom of the iron filings recovery pool and connected thereto, and the end of the filter pipe away from the iron filings recovery pool is connected to the water flushing faucet mechanism for the recycling of the filtered and separated grinding water.

[0007] Preferably, the scrap recycling pool includes a coarse separation pool and a fine separation pool distributed at the top and bottom, respectively used for separating large and small scrap. The coarse separation pool includes a first water pool and a separation disc detachably installed on the upper part of the first water pool. The separation disc includes a slot formed in the inner wall of the first water pool and a frame that limits and engages with the slot. A disc body is fixed between the two frames. A circulation channel and a circulation groove are respectively formed on the upper and lower surfaces of the disc body and are interconnected.

[0008] Preferably, the fine separation tank includes a second water tank fixed to the bottom of the first water tank; an inlet and an outlet respectively opened at the top and bottom of the second water tank, wherein the inlet of the second water tank is connected to the assembly groove opened at the bottom of the first water tank and a first filter frame is fixed thereon; and a sealing base plate detachably installed at the outlet of the second water tank, wherein a second filter frame is fixed on the surface of the sealing base plate, and the top of the second filter frame is connected to the bottom of the first filter frame and together with the first filter frame divides the interior of the second water tank into an inner and outer distributed first filter chamber and a second filter chamber; a magnetic separator is also arranged in a ring on the inner wall of the first filter frame, which is used for the collection and recycling of iron filings when several magnetic separators are running.

[0009] Preferably, the filter fitting includes a first pipe body installed on the side wall of the second water tank and communicating with the second water tank; and a second pipe body, one end of the second pipe body being connected to the end of the first pipe body away from the second water tank and having a filter valve core inside, and the other end of the second pipe body being connected to a connecting pipe, the connecting pipe communicating with a flushing faucet mechanism.

[0010] Preferably, the flushing faucet mechanism includes a cooling box fixed to the top of the base, wherein the lower part of the cooling box is connected to and communicates with a connecting pipe, and the faucet body is installed on its top; and a pump body disposed on the top of the cooling box for controlling the inlet and outlet of water in the faucet body.

[0011] Preferably, the oil cooling mechanism includes a liquid storage tank fixed to the top of the base, wherein the first water tank and the second water tank are respectively mounted on the upper and lower parts of one side of the cooling tank and the liquid storage tank; and a piston suction assembly disposed between the liquid storage tank and the second pipe body for drawing the liquid inside the liquid storage tank into the second pipe body for cooling.

[0012] Preferably, the piston suction assembly includes a piston sleeve fixed to the side wall of the second tube and communicating with the second tube, the piston sleeve having a piston plate inside; a piston rod fixed to the side wall of the piston plate, wherein the end of the piston rod away from the piston plate extends out of the piston sleeve and is fixed with a transmission block; and a spring disposed on the outer wall of the piston rod between the transmission block and the piston sleeve for resetting the piston plate; the side wall of the piston sleeve is also provided with a conduit, the end of the conduit away from the piston sleeve communicating with a liquid storage tank and having a first one-way valve facing the piston sleeve inside; and also includes a second one-way valve disposed on the side wall of the piston sleeve and facing the second tube.

[0013] Preferably, a stirring assembly is provided on the side of the cooling tank and the liquid storage tank away from the scrap recycling pool to accelerate the mixing of the liquid inside the second tube; the stirring assembly includes a mounting frame fixed to the liquid storage tank and the cooling tank, and a motor located in the middle of the mounting frame, wherein the rotating shaft fixed at the output end of the motor passes through the mounting frame and the through hole opened at the end of the second tube and is fixed with a number of stirring rods.

[0014] Preferably, a rotary sealing plug is also provided at the connection between the rotating shaft and the second tube.

[0015] Preferably, a truncated cylindrical sleeve is fixed on the side of the rotating shaft near the motor, wherein the inclined surface of the truncated cylindrical sleeve contacts the transmission block.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. This utility model utilizes a filtration and circulation mechanism and an oil cooling mechanism to filter and separate iron filings and grinding wheel dust, and to circulate the cooled grinding water during the process of rinsing the blades with a water faucet. This design not only achieves closed-loop recycling of grinding water, greatly reducing the consumption of fresh grinding water and the amount of waste liquid to be treated, but also efficiently removes iron filings and grinding wheel dust / grinding debris generated during the grinding process during the circulation process, thereby ensuring the cleanliness of the grinding water, protecting the cutting tools, and improving the processing quality.

[0018] 2. As another embodiment of this utility model, the coarse and fine separation tanks arranged at the top and bottom not only intercept large particles of grinding debris and iron filings, but also allow the grinding debris separated by the coarse separation tank to fall into the first filter chamber first, and then move into the second filter chamber through the filter frame to achieve a first-stage filtration operation. Furthermore, the collection of iron filings is further achieved through several magnetic separators arranged on the inner wall of the filter frame.

[0019] 3. As another embodiment of this utility model, by setting up a filter pipe, when the grinding water after primary filtration passes through the filter pipe, the filter valve core can perform secondary filtration on the grinding water to ensure the filtration effect.

[0020] 4. As another embodiment of this utility model, by setting an oil cooling mechanism, when the piston plate inside the piston sleeve moves, the liquid inside the storage tank can be drawn into the piston sleeve and pushed into the second tube, thereby realizing the accelerated cooling process of the liquid inside the second tube. Attached Figure Description

[0021] Figure 1 This is a first-view perspective three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a second-view perspective three-dimensional structural diagram of the present invention;

[0023] Figure 3 This is a third-view three-dimensional structural diagram of the present invention;

[0024] Figure 4 This is a top view of the structure of this utility model;

[0025] Figure 5 This is a cross-sectional schematic diagram of the main structure of AA;

[0026] Figure 6 This is a magnified structural diagram of point A.

[0027] In the diagram: 111, machine base;

[0028] 211. Cooling tank; 212. Faucet body; 213. Pump body;

[0029] 311. Second water tank; 312. First water tank; 313. Card slot; 314. Card frame; 315. Disc body; 316. Circulation channel; 317. Circulation groove; 318. Filter frame; 319. Magnetic separator; 320. Sealing base plate;

[0030] 411. First pipe body; 412. Second pipe body; 413. Filter valve core; 414. Connecting pipe;

[0031] 511. Liquid storage tank; 512. Mounting bracket; 513. Motor; 514. Rotating shaft; 515. Stirring rod; 516. Piston sleeve; 517. Guide tube; 518. Piston plate; 519. Piston rod; 520. Transmission block; 521. Spring; 522. Inclined cylindrical sleeve; 523. Rotary sealing plug. Detailed Implementation

[0032] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0033] Example 1

[0034] Please see Figures 1 to 6The present invention preferably provides a technical solution: a water circulation cooling device for a grinding mill, comprising: a base 111; a water flushing faucet mechanism, a filtration and circulation mechanism, and an oil cooling mechanism disposed on the base 111. When the water flushing faucet mechanism washes away the grinding wheel dust and iron filings on the blades, the filtration and circulation mechanism and the oil cooling mechanism are respectively used for the recovery of the grinding wheel dust and iron filings and the cooling of the grinding water; wherein, the filtration and circulation mechanism includes an iron filings recovery pool, a filter pipe disposed at the bottom of the iron filings recovery pool and connected thereto, and the end of the filter pipe away from the iron filings recovery pool is connected to the water flushing faucet mechanism for the recycling of the filtered and separated grinding water.

[0035] like Figure 1 , 2 As shown in Figures 3 and 4, the flushing faucet mechanism, the filtration circulation mechanism, and the oil cooling mechanism installed on the machine base 111 are arranged in a U-shape. The filtration circulation mechanism, located in the middle, includes a scrap recovery tank and a filter pipe located at the bottom of the scrap recovery tank and connected to it. The end of the filter pipe away from the scrap recovery tank is connected to the flushing faucet mechanism. When the flushing faucet structure washes away the grinding wheel dust and scrap on the blade, the scrap recovery tank and filter pipe where the filtration circulation mechanism is located are used to collect the scrap and grinding wheel dust. In order to improve the utilization rate of water resources, the grinding water after filtration and separation can re-enter the flushing faucet mechanism. Considering that the grinding water used to rinse the blade is at a high temperature, if high-temperature grinding water is used to rinse the blade, it will not only affect the grinding effect of the blade, but also greatly damage the blade's precision and the grinding wheel. Therefore, this application provides an oil cooling mechanism on the machine base 111 that is connected to the filter pipe to cool the grinding water after filtration and separation.

[0036] Example 2

[0037] As another embodiment of this utility model, the scrap recycling pool includes a coarse separation pool and a fine separation pool distributed at the top and bottom, respectively used for separating large and small grinding chips; the coarse separation pool includes a first water pool 312, a separation disc detachably installed on the upper part of the first water pool 312, the separation disc includes a slot 313 formed in the inner wall of the first water pool 312, a frame 314 that limits and engages with the slot 313; a disc body 315 fixed inside the frame 314; and a circulation channel 316 and a circulation groove 317 respectively formed on the upper and lower surfaces of the disc body 315 and interconnected with each other.

[0038] Furthermore, the fine separation tank includes a second water tank 311 fixed at the bottom of the first water tank 312; an inlet and an outlet respectively opened at the top and bottom of the second water tank 311, wherein the inlet of the second water tank 311 is connected to the assembly groove opened at the bottom of the first water tank 312 and a first filter frame 3181 is fixed thereon; and a sealing bottom plate 320 is set at the outlet of the second water tank 311, the surface of the sealing bottom plate 320 is fixed with a second filter frame 3182, and the top of the second filter frame 3182 is connected to the bottom of the first filter frame 3181 and together with the first filter frame 3181, the interior of the second water tank 311 is divided into an inner and an outer distributed first filter chamber and a second filter chamber; a magnetic separator 319 is also arranged in a ring on the inner wall of the first filter frame 3181, which is used for the collection and recycling of iron filings when several magnetic separators 319 are running.

[0039] This implementation example Figure 1-5 As shown, the coarse separation tank and the fine separation tank are arranged vertically. The separation disc containing the coarse separation tank is used to intercept large particles of grinding debris and iron filings, as detailed below. Figure 5 As shown, the disc body 315 containing the separation disc is limited and locked to the slot 313 provided in the first water tank 312 by the retaining frame 314 on its outer periphery. This design facilitates the cleaning of grinding debris and iron filings on the separation disc. The circular flow channel 316 and the circular groove 317 opened on the surface of the disc body 315 are used to receive grinding debris and iron filings in a range to reduce the risk of grinding debris and iron filings accumulating and separating. The circular groove 317 of a certain width is used to intercept grinding debris and iron filings that are larger than its width.

[0040] like Figure 3 , 5 As shown, the second water tank 311, where the fine separation tank is located, is fixed to the bottom of the first water tank 312. The first filter frame 3181 and the second filter frame 3182, connected vertically, are placed between the inlet and outlet of the second water tank 311, dividing the interior of the second water tank 311 into inner and outer distributed first and second filter chambers, respectively. Figure 5 As shown, the abrasive particles separated by the coarse separation tank can first fall into the first filter chamber (the surface of the sealing base plate 320), and then move into the second filter chamber through the first filter chamber. During this process, the second filter frame 3182 can perform a first-stage filtration operation.

[0041] In order to achieve centralized separation of iron filings, although the coarse separation tank can intercept a certain volume of iron filings, small iron filings still need to be processed. Therefore, this application provides a number of magnetic separators 319 on the inner wall of the first filter frame 3181. The magnetic separators 319 are preferably electromagnetic blocks. Electromagnetic blocks are a mature existing technology. When they are energized, they can collect iron filings. When they are de-energized, the iron filings fall into the first filter chamber. At this time, the sealing bottom plate 320 is opened, and the second filter frame 3182 is removed at the same time so as to clean the grinding debris and iron filings inside the second filter frame 3182 in a concentrated manner.

[0042] It is worth noting that a pull-out groove is provided at the bottom of the second water tank 311, and a sealing gasket is provided on the upper surface of the sealing base plate 320 to ensure the sealing of the bottom outlet of the second water tank 311 by the sealing base plate 320.

[0043] Example 3

[0044] As another embodiment of the present invention, the filter pipe includes a first pipe body 411 installed on the side wall of the second water tank 311 and communicating with the second water tank 311; and a second pipe body 412, one end of the second pipe body 412 being connected to the end of the first pipe body 411 away from the second water tank 311 and having a filter valve core 413 inside, and the other end being connected to a connecting pipe 414, which is connected to a flushing faucet mechanism.

[0045] This implementation example Figure 4 , 5 As shown, the first pipe body 411, the second pipe body 412 and the connecting pipe 414 are connected in sequence and used to connect the second water tank 311 and the flushing faucet mechanism. When the grinding water after primary filtration passes through the filter pipe, the filter valve core 413 can perform secondary filtration on the grinding water to ensure the filtration effect.

[0046] It is worth noting that the second tube 412 and the first tube 411 are sealed and detachable to facilitate the removal and replacement of the filter valve core 413.

[0047] Example 4

[0048] As another embodiment of the present invention, the flushing faucet mechanism includes a cooling box 211 fixed on the top of the base 111, wherein the lower part of the cooling box 211 is connected and communicates with the connecting pipe 414, and the top of the cooling box 211 is equipped with a faucet body 212; and a pump body 213 disposed on the top of the cooling box 211 for controlling the water inlet and outlet of the faucet body 212.

[0049] like Figure 1 , 2As shown in Figures 4 and 5, the pump body 213 is preferably a water pump, which is a mature existing technology and will not be described in detail here. When the pump body 213 is driven, the liquid inside the connecting pipe 414 is cooled by the cooling box 211 and flows out again from the faucet body 212, realizing a cycle. The cooling box is a mature existing technology and further cools the liquid inside the connecting pipe 414.

[0050] Example 5

[0051] In another embodiment of this utility model, the oil cooling mechanism includes a liquid storage tank 511 fixed to the top of the base 111, wherein the first water tank 312 and the second water tank 311 are respectively mounted on the upper and lower parts of one side of the cooling box 211 and the liquid storage tank 511; and a piston suction assembly disposed between the liquid storage tank 511 and the second tube 412, for drawing the liquid inside the liquid storage tank 511 into the second tube 412 for cooling; further, the piston suction assembly includes a piston sleeve 516 fixed to the side wall of the second tube 412 and communicating with the second tube 412, and a piston is disposed inside the piston sleeve 516. The piston plate 518; a piston rod 519 fixed to the side wall of the piston plate 518, wherein the end of the piston rod 519 away from the piston plate 518 extends out of the piston sleeve 516 and is fixed with a transmission block 520; and a spring 521 disposed on the outer wall of the piston rod 519 between the transmission block 520 and the piston sleeve 516 for resetting the piston plate 518; a conduit 517 is also disposed on the side wall of the piston sleeve 516, the end of the conduit 517 away from the piston sleeve 516 is connected to the liquid storage tank 511 and is provided with a first one-way valve facing the piston sleeve 516; and a second one-way valve disposed on the side wall of the piston sleeve 516 and facing the second tube 412.

[0052] In this embodiment, the liquid stored in the liquid storage tank 511 is preferably coolant (preferably cutting oil). The liquid storage tank 511 is connected to the piston sleeve 516 through the conduit 517 and is provided with a first one-way valve facing the piston sleeve 516. The piston sleeve 516 is connected to the second tube 412 and is provided with a second one-way valve facing the second tube 412. Therefore, when the piston plate 518 provided in the piston sleeve 516 moves, the liquid inside the liquid storage tank 511 can be drawn into the piston sleeve 516 and pushed into the second tube 412, thereby realizing the accelerated cooling process of the liquid inside the second tube 412.

[0053] Example 6

[0054] As another embodiment of this utility model, a stirring assembly is also provided on the side of the cooling tank 211 and the liquid storage tank 511 away from the iron filings recycling pool to accelerate the mixing of the liquid inside the second tube 412; the stirring assembly includes a mounting frame 512 fixed to the liquid storage tank 511 and the cooling tank 211, and a motor 513 located in the middle of the mounting frame 512, wherein a rotating shaft 514 fixed at the output end of the motor 513 passes through the through hole opened at the end of the mounting frame 512 and the second tube 412 and is fixed with a plurality of stirring rods 515; furthermore, a rotary sealing plug 523 is also provided at the connection between the rotating shaft 514 and the second tube 412.

[0055] like Figure 5 , 6 As shown, since the second tube 412 is the concentrated location of grinding water and coolant, in order to improve the mixing effect of the two and improve the cooling efficiency of the grinding water, the rotating shaft 514 provided in this application has several stirring rods 515 installed at one end that extends into the second tube 412, and a motor 513 fixed at the other end. When the motor 513 is running, the mixing process of the two can be accelerated by rotating the height of the stirring rods 515.

[0056] Example 7

[0057] In another embodiment of this utility model, a truncated cylindrical sleeve 522 is fixed on the side of the rotating shaft 514 near the motor 513, wherein the inclined surface of the truncated cylindrical sleeve 522 contacts the transmission block 520.

[0058] In order to improve energy utilization, this embodiment uses the power of motor 513 in embodiment 6 to synchronously drive the piston rod 519 and piston plate 518 where the piston suction assembly is located, so as to realize the synchronous operation of the piston suction assembly and the stirring assembly.

[0059] Furthermore, a control panel 321 is installed on the side wall of the first water tank 312. The control panel 321 is a mature existing technology. By operating the control panel 321, the power supply to the magnetic separator 319 and the start and stop of the motor 513 and pump body 213 can be controlled.

[0060] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection", "fixation" and other terms should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral part. There are various ways to install detachably, such as by using a plug-in and snap-fit ​​method, or by using a bolt connection, etc.

[0061] The above description of the specific embodiments of this utility model is only used to further illustrate this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-essential improvements and adjustments made to this utility model by technical engineers based on the above description of the utility model shall fall within the scope of protection of this utility model.

Claims

1. A water circulation cooling device for a grinding mill, characterized in that ,include: Base (111); The water flushing faucet mechanism, the filter circulation mechanism, and the oil cooling mechanism provided on the machine base (111) are used to recover the grinding wheel dust and iron filings and cool the grinding water, respectively, when the water flushing faucet structure washes away the grinding wheel dust and iron filings on the blade. The filtration and circulation mechanism includes an iron filings recycling pool, a filter pipe located at the bottom of the iron filings recycling pool and connected thereto, and the end of the filter pipe away from the iron filings recycling pool is connected to a flushing faucet mechanism for recycling the filtered and separated grinding water.

2. The water circulation cooling device for the mill car according to claim 1, characterized in that: The scrap recycling pool includes coarse separation pools and fine separation pools distributed at the top and bottom, which are used for separating large and small scraps, respectively. The coarse separation tank includes a first water tank (312), a separation plate that can be detachably installed on the upper part of the first water tank (312), the separation plate including a slot (313) formed in the inner wall of the first water tank (312), a frame (314) that limits and engages with the slot (313); and a plate body (315) fixed between the two frames (314). And a loop flow channel (316) and a loop groove (317) respectively opened on the upper and lower surfaces of the disc body (315) and connected to each other.

3. The water circulation cooling device for the mill car according to claim 2, characterized in that: The fine separation tank includes a second water tank (311) fixed to the bottom of the first water tank (312); The inlet and outlet are respectively opened at the top and bottom of the second water tank (311), wherein the inlet of the second water tank (311) is connected to the assembly groove opened at the bottom of the first water tank (312) and a first filter frame (3181) is fixed thereon; And a sealing base plate (320) that can be detachably installed at the outlet of the second water tank (311), wherein a second filter frame (3182) is fixed on the surface of the sealing base plate (320), and the top of the second filter frame (3182) is connected to the bottom of the first filter frame (3181) and together with the first filter frame (3181), the interior of the second water tank (311) is divided into an inner and an outer distributed first filter chamber and a second filter chamber; The inner wall of the first filter frame (3181) is also provided with a magnetic separator (319) in a ring shape. When several magnetic separators (319) are running, they are used for the collection and recycling of iron filings.

4. The water circulation cooling device for the mill car according to claim 3, characterized in that: The filter fitting includes a first pipe body (411) installed on the side wall of the second water tank (311) and communicating with the second water tank (311); And a second pipe body (412), one end of which is connected to the end of the first pipe body (411) away from the second water tank (311) and is provided with a filter valve core (413) inside, and the other end of which is connected to a connecting pipe (414), which is connected to the flushing faucet mechanism.

5. The water circulation cooling device for the mill car according to claim 4, characterized in that: The flushing faucet mechanism includes a cooling box (211) fixed on the top of the base (111), wherein the lower part of the cooling box (211) is connected to and communicates with the connecting pipe (414), and the faucet body (212) is installed on its top. And a pump body (213) located on top of the cooling tank (211) for controlling the inlet and outlet of water in the faucet body (212).

6. The water circulation cooling device for the mill car according to claim 5, characterized in that: The oil cooling mechanism includes a liquid storage tank (511) fixed on the top of the base (111), wherein the first water tank (312) and the second water tank (311) are respectively mounted on the upper and lower parts of one side of the cooling box (211) and the liquid storage tank (511); And a piston suction assembly disposed between the liquid storage tank (511) and the second tube (412) for drawing the liquid inside the liquid storage tank (511) into the second tube (412) for cooling.

7. The water circulation cooling device for the mill car according to claim 6, characterized in that: The piston suction assembly includes a piston sleeve (516) fixed to the side wall of the second tube (412) and communicating with the second tube (412), and a piston plate (518) is provided inside the piston sleeve (516); A piston rod (519) is fixed to the side wall of the piston plate (518), wherein one end of the piston rod (519) away from the piston plate (518) extends out of the piston sleeve (516) and is fixed with a transmission block (520); And a spring (521) disposed on the outer wall of the piston rod (519) between the transmission block (520) and the piston sleeve (516) for resetting the piston plate (518); The piston sleeve (516) is also provided with a conduit (517) on its side wall. The end of the conduit (517) away from the piston sleeve (516) is connected to the liquid storage tank (511) and is provided with a first one-way valve facing the piston sleeve (516). It also includes a second check valve disposed on the side wall of the piston sleeve (516) and facing the second tube (412).

8. The water circulation cooling device for the mill car according to claim 7, characterized in that: The cooling tank (211) and the liquid storage tank (511) are also equipped with a stirring assembly on the side away from the scrap recycling pool to accelerate the mixing of the liquid inside the second tube (412). The stirring assembly includes a mounting bracket (512) fixed to the liquid storage tank (511) and the cooling tank (211), and a motor (513) located in the middle of the mounting bracket (512). The output end of the motor (513) has a rotating shaft (514) fixed thereon, which passes through the mounting bracket (512) and the through hole opened at the end of the second tube (412) and is fixed with a number of stirring rods (515).

9. The water circulation cooling device for the mill car according to claim 8, characterized in that: A rotary sealing plug (523) is also provided at the connection between the rotating shaft (514) and the second tube (412).

10. The water circulation cooling device for the mill car according to claim 8, characterized in that: The rotating shaft (514) is fixed with a truncated cylindrical sleeve (522) on the side near the motor (513), wherein the inclined surface of the truncated cylindrical sleeve (522) is in contact with the transmission block (520).

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