Quenching device for steel processing

Abstract

The utility model relates to a quenching device for steel processing, comprising: a quenching bath, which is internally provided with a chamber for storing quenching liquid; the filter screen cage is arranged in the quenching bath and is used for placing a workpiece; the lifting piece is arranged on the quenching bath, and the lifting piece is connected with the filter screen cage and used for driving the filter screen cage to ascend and descend; the group of stirrers are oppositely arranged on the quenching bath and are used for driving the quenching liquid in the cavity to flow; through cooperation of the filter net cage and the electric push rod, the stability of workpieces can be kept, impurities generated in the quenching process can be collected, manual cleaning after shutdown is avoided, the cleaning efficiency is improved, meanwhile, rapid lifting of the workpieces is achieved, the workpieces are conveniently taken and placed, the requirement for manual operation is reduced, and the production cost is reduced. And the labor intensity of workers is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel processing, in particular to a quenching device for steel processing. BACKGROUND

[0002] In the field of steel processing, quenching is a key step to improve the mechanical properties of steel such as hardness, wear resistance and toughness. During quenching, the steel is rapidly immersed in quenching liquid to achieve rapid cooling, thereby forming the desired microstructure.

[0003] In actual operation, when the steel is immersed in the quenching pool, due to the violent reaction of high-temperature steel and quenching liquid, solid impurities such as oxide scale and carbon black will be produced. These impurities not only pollute the quenching liquid and reduce its cooling effect, but also may adhere to the surface of the steel, affecting the quenching quality. With the passage of time, the impurities in the quenching liquid will gradually accumulate. Then, the existing quenching pool is usually not convenient for cleaning the precipitated solid impurities, which usually needs to be cleaned manually after shutdown, which not only consumes time and effort, but also has low cleaning efficiency.

[0004] In addition, during the quenching process, in order to ensure the quenching effect, the workpiece usually needs to be immersed in the quenching pool as a whole. However, this operation requirement brings great inconvenience to the taking of the workpiece. Workers need to spend physical effort to immerse and take out the workpiece from the quenching pool, which increases the labor intensity of workers.

[0005] In view of the above problems, a quenching device for steel processing is designed. CONTENT OF THE INVENTION

[0006] The embodiment of the present application provides a quenching device for steel processing, to solve the problem that the existing quenching pool in the related art is usually not convenient for cleaning the precipitated solid impurities, which usually needs to be cleaned manually after shutdown, which not only consumes time and effort, but also has low cleaning efficiency.

[0007] In the first aspect, a quenching device for steel processing is provided, comprising:

[0008] a quenching pool having a cavity for storing quenching liquid inside;

[0009] a filter screen cage arranged in the quenching pool and used for placing workpieces;

[0010] a lifting member arranged on the quenching pool, the lifting member being connected with the filter screen cage for driving the filter screen cage to ascend and descend;

[0011] a set of stirrers oppositely arranged on the quenching pool for driving the quenching liquid inside the cavity to flow;

[0012] The lifting member comprises two electric push rods arranged oppositely on the quenching tank and two mounting plates arranged oppositely on two sides of the filter cage, and a piston rod of the electric push rod is connected with the corresponding mounting plate.

[0013] In some embodiments, the quenching tank is provided with a liquid supply pipe for supplying quenching liquid and a liquid discharge valve for discharging quenching liquid.

[0014] In some embodiments, the filter cage comprises a cage body enclosed by a plurality of filter screens, the cage body has a cavity inside for placing workpieces, and the top of the cage body is open.

[0015] The filter cage further comprises a plurality of reinforcing ribs distributed along the height of the cage body.

[0016] In some embodiments, two mounting grooves are oppositely arranged on the quenching tank, and the electric push rod is arranged in the corresponding mounting groove.

[0017] Four mounting grooves two are also oppositely arranged on the quenching tank, the four mounting grooves two are arranged in a rectangular shape, a guide rod is arranged in the mounting groove two, and the top end of the guide rod is connected with the mounting plate.

[0018] In some embodiments, the guide rod comprises an outer cylinder and an inner cylinder which are mutually sleeved, the top end of the inner cylinder is fixedly connected with the inner bottom wall of the mounting groove two, and the top end of the outer cylinder is connected with the mounting plate.

[0019] In some embodiments, the top end of the outer cylinder and the top end of the piston rod of the electric push rod are both provided with a plurality of insertion rods, and a plurality of insertion holes matched with the insertion rods are arranged on the mounting plate.

[0020] The insertion rod penetrates through the corresponding insertion hole and extends outward, and the insertion rod and the mounting plate are connected through bolts.

[0021] In some embodiments, the number of the group of stirrers is two.

[0022] The stirrer comprises:

[0023] a baffle arranged on the quenching tank,

[0024] a drive motor and a speed reducer arranged on the baffle;

[0025] a stirring rod rotatably arranged in the cavity;

[0026] The output shaft of the drive motor is connected with the input shaft of the speed reducer, and the output shaft of the speed reducer is connected with the top end of the stirring rod.

[0027] In some embodiments, the quenching tank is provided with two flow pipes for the flow of quenching liquid, and the other ends of the flow pipes are respectively communicated with corresponding ports of an external plate cooler.

[0028] The quenching device for steel processing provided in the embodiments of the present application is helpful to maintain the stability of the workpiece by cooperation of the filter cage and the electric push rod, collects impurities generated in the quenching process, avoids manual cleaning after stopping, improves the cleaning efficiency, and also realizes rapid lifting of the workpiece, facilitates taking and placing the workpiece, reduces the demand for manual operation, and reduces the labor intensity of workers.

[0029] Continuous operation of the stirrer is also helpful to maintain the cleanliness and temperature stability of the quenching liquid, and reduces production interruption caused by quality problems of the quenching liquid.

[0030] Lifting of the filter cage is controlled by the electric push rod, which avoids direct operation of workers in the quenching liquid, thereby reducing safety risks such as scalding. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0032] Figure 1 Three-dimensional structure diagram provided in the embodiments of the present application Figure 1 ;

[0033] Figure 2 Front view and sectional view provided in the embodiments of the present application

[0034] Figure 3 Three-dimensional structure diagram provided in the embodiments of the present application Figure 2 ;

[0035] Figure 4 Three-dimensional diagram of the filter cage provided in the embodiments of the present application

[0036] Figure 5 Three-dimensional diagram of the guide rod provided in the embodiments of the present application.

[0037] In the drawings: 1, quenching tank; 11, liquid supply pipe; 12, liquid discharge valve; 2, chamber; 3, filter cage; 4, lifting piece; 41, electric push rod; 42, mounting plate; 5, stirrer; 51, baffle; 52, driving motor; 53, speed reducer; 54, stirring rod; 31, cage main body; 32, reinforcing rib; 6, mounting groove; 7, flow pipe; 8, mounting groove two; 9, guide rod; 91, outer cylinder; 92, inner cylinder; 10, insertion rod. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] This application provides a quenching device for steel processing, which solves the problem that existing quenching pools in related technologies are usually not convenient for cleaning precipitated solid impurities, and usually require manual cleaning after machine shutdown, which is not only time-consuming and labor-intensive, but also has low cleaning efficiency.

[0040] Please see Figures 1-3 A quenching device for steel processing includes: a quenching pool 1, a filter cage 3, a lifting member 4, and a set of agitators 5. The quenching pool 1 has a chamber 2 for storing quenching fluid. The filter cage 3 is arranged in the quenching pool 1 and is used to place workpieces. The lifting member 4 is arranged on the quenching pool 1 and is connected to the filter cage 3 to drive the filter cage 3 to rise and fall. A set of agitators 5 is arranged opposite to each other on the quenching pool 1 to drive the flow of quenching fluid inside the chamber 2. The lifting member 4 includes two electric push rods 41 arranged opposite to each other on the quenching pool 1, and two mounting plates 42 arranged opposite to each other on both sides of the filter cage 3. The piston rods of the electric push rods 41 are connected to the corresponding mounting plates 42.

[0041] The workpiece is placed in a filter cage 3, which allows the quenching fluid to pass freely, ensuring uniform quenching. During quenching, the piston rod of the electric push rod 41 retracts, causing the filter cage 3 to descend via the mounting plate 42. Subsequently, the filter cage 3, along with the workpiece, is submerged into the chamber 2 of the quenching tank 1, which is filled with quenching fluid. The quenching fluid can be water, oil, or other quenching media suitable for specific steels. The quenching fluid rapidly cools the workpiece to alter its internal structure, improving its hardness and wear resistance.

[0042] After the quenching process is completed, the piston rod of the electric push rod 41 extends, driving the filter cage 3 to rise via the mounting plate 42, thus easily removing the workpiece from the quenching liquid. This lifting function not only improves operational convenience but also reduces the safety risks associated with manual operation.

[0043] At the same time, stirrer 5 is started. The stirring action of stirrer 5 helps to distribute the heat in the quenching liquid evenly, prevents local overheating or undercooling, and thus improves the consistency and uniformity of the quenching effect.

[0044] The cooperation of the filter screen cage 3 and the electric push rod 41 helps to maintain the stability of the workpiece, collects impurities generated during the quenching process, avoids the need for manual cleaning after stopping, improves cleaning efficiency, and also realizes the rapid lifting of the workpiece, facilitates the taking and placing of the workpiece, reduces the need for manual operation, and reduces the labor intensity of workers.

[0045] The continuous operation of the stirrer 5 also helps to maintain the cleanliness and temperature stability of the quenching liquid, reducing production interruptions caused by quenching liquid quality problems.

[0046] The lifting of the filter screen cage 3 is controlled by the electric push rod 41, avoiding direct operation of workers in the quenching liquid and thus reducing the risk of burns and other safety risks.

[0047] As shown in Figure 1 and Figure 2 , in one embodiment, the quenching tank 1 is provided with a liquid supply pipe 11 for supplying quenching liquid and a liquid discharge valve 12 for discharging quenching liquid.

[0048] The liquid supply pipe 11 serves as a channel for the quenching liquid to enter the quenching tank 1, with one end connected to a quenching liquid supply source and the other end extending into the chamber 2 of the quenching tank 1.

[0049] When it is necessary to add quenching liquid to the quenching tank 1, the pump or other power device of the external liquid supply system is controlled to pump the quenching liquid into the liquid supply pipe 11, and then flow into the chamber 2 of the quenching tank 1, until the predetermined liquid level is reached.

[0050] The liquid discharge valve 12 is installed at the bottom or below the side wall of the quenching tank 1, and is used to discharge the quenching liquid in the quenching tank 1 when needed.

[0051] When the quenching process is completed or the quenching liquid needs to be replaced, the liquid discharge valve 12 can be opened, allowing the quenching liquid to flow out of the quenching tank 1 under the action of gravity into a collection system or waste liquid treatment device.

[0052] As shown in Figure 4 , specifically, the filter screen cage 3 includes a screen cage body 31 formed by a plurality of filter screens, the screen cage body 31 has a cavity inside for placing workpieces, and the top of the screen cage body 31 is open.

[0053] The screen cage body 31 is formed by a plurality of filter screens, wherein the filter screens are usually made of corrosion-resistant and high-temperature-resistant materials to ensure stable performance during the quenching process.

[0054] The screen cage body 31 has a cavity inside for placing workpieces to be quenched, and the top of the screen cage body 31 is designed to be open to facilitate the placement and removal of the workpieces.

[0055] The reinforcing ribs 32 are distributed along the height direction of the mesh cage body 31 to enhance the structural strength and stability of the filter mesh cage 3. The reinforcing ribs 32 are tightly connected with the filter mesh of the mesh cage body 31, forming a whole structure that can withstand the pressure and impact force from the workpiece and quenching liquid during the quenching process.

[0056] During the quenching process, the workpiece is placed in the cavity of the filter mesh cage 3, and then the whole filter mesh cage 3 is immersed into the chamber 2 of the quenching tank 1.

[0057] The quenching liquid flows into the cavity through the filter mesh of the mesh cage body 31 to rapidly cool the workpiece.

[0058] The reinforcing ribs 32 play a role in supporting and stabilizing the filter mesh cage 3 during the quenching process, preventing the filter mesh cage 3 from deforming or being damaged due to the pressure and impact force of the quenching liquid.

[0059] After the quenching is completed, the filter mesh cage 3 is lifted out of the quenching tank 1 together with the workpiece, and the workpiece is taken out for subsequent processing.

[0060] As shown in Figure 3 In this embodiment, two installation grooves 6 are oppositely provided on the quenching tank 1, and the electric push rod 41 is arranged in the corresponding installation groove 6. Four installation grooves two 8 are also oppositely provided on the quenching tank 1, and the four installation grooves two 8 are distributed in a rectangular shape. A guide rod 9 is arranged inside each installation groove two 8, and the top end of the guide rod 9 is connected with the installation plate 42.

[0061] The connecting part at the bottom of the electric push rod 41 is embedded in the installation groove 6 and firmly installed on the quenching tank 1 by bolts or welding.

[0062] The installation grooves two 8 are oppositely provided on the quenching tank 1 and are distributed in a rectangular shape. A guide rod 9 is arranged inside each installation groove two 8.

[0063] The top end of the guide rod 9 is connected with the installation plate 42 on both sides of the filter mesh cage 3, forming a guiding effect for the lifting movement of the filter mesh cage 3, so that the filter mesh cage 3 can remain stable and vertical during the lifting process, avoiding damage to the workpiece or poor quenching effect due to deviation or inclination.

[0064] During the quenching process, the lifting movement of the filter mesh cage 3 is controlled by the electric push rod 41 and the guide rod 9:

[0065] When the filter mesh cage 3 needs to be lowered, the piston rod of the electric push rod 41 is retracted, pushing the installation plate 42 and the filter mesh cage 3 to move downward. The guide rod 9 plays a guiding role in this process, ensuring that the filter mesh cage 3 descends smoothly.

[0066] When the quenching is completed, the piston rod of the electric push rod 41 is extended, pulling the mounting plate 42 and the filter cage 3 to move upward. At the same time, the guide rod 9 ensures that the filter cage 3 remains stable and vertical during the upward movement.

[0067] As shown in the drawings, in the present embodiment, the guide rod 9 comprises an outer cylinder 91 and an inner cylinder 92 that are nested with each other, the top end of the inner cylinder 92 is fixedly connected with the inner bottom wall of the mounting groove two 8, and the top end of the outer cylinder 91 is connected with the mounting plate 42. Figure 5

[0068] The outer cylinder 91 is the external component of the guide rod 9, and the top end thereof is connected with the mounting plate 42 on both sides of the filter cage 3. The diameter of the outer cylinder 91 is slightly larger than that of the inner cylinder 92, so as to slide on the inner cylinder 92 and realize the guiding function.

[0069] The inner cylinder 92 is the internal component of the guide rod 9, and the top end thereof is fixedly connected with the inner bottom wall of the mounting groove two 8. The bottom of the inner cylinder 92 is provided with a positioning structure, such as a flange or a thread, so as to be fixedly connected with the inner bottom wall of the mounting groove two 8.

[0070] As shown in the drawings, in particular, in the present embodiment, the top end of the outer cylinder 91 and the top end of the piston rod of the electric push rod 41 are both provided with a plurality of insertion rods 10, and a plurality of insertion holes that are adapted to the insertion rods 10 are formed in the mounting plate 42; the insertion rods 10 pass through the corresponding insertion holes and extend outward, and the insertion rods 10 and the mounting plate 42 are connected by bolts. The insertion rods 10 are provided with threads that are adapted to the bolts Figure 3

[0071] The insertion rods 10 are arranged at the top end of the outer cylinder 91 and the top end of the piston rod of the electric push rod 41, respectively, and the insertion rods 10 are provided with threads that are adapted to the bolts, so as to be fixedly connected with the mounting plate 42.

[0072] The mounting plate 42 is arranged on both sides of the filter cage 3, and is used to connect the outer cylinder 91 and the electric push rod 41. A plurality of insertion holes that are adapted to the insertion rods 10 are formed in the mounting plate 42, and the number and position of the insertion holes correspond to those of the insertion rods 10.

[0073] When the outer cylinder 91 or the electric push rod 41 needs to be connected to the mounting plate 42, the insertion rods 10 are first aligned and inserted into the corresponding insertion holes.

[0074] Then, the insertion rods 10 are fixedly connected with the mounting plate 42 by bolts. Since the insertion rods 10 are provided with threads, the bolts can be easily screwed in and locked, ensuring the stability and reliability of the connection.

[0075] The connection structure of the guide rod 9 and the outer cylinder 91 not only improves the connection stability, but also facilitates installation and disassembly, and enhances the structural strength, making the quenching device more efficient, reliable and easy to use. ​​

[0076] In one embodiment, the number of said stirrers 5 is two; said stirrer 5 comprises: a baffle 51 arranged on the quenching tank 1, a drive motor 52 and a speed reducer 53 arranged on the baffle 51; a stirring rod 54 rotatably arranged inside the chamber 2; the output shaft of said drive motor 52 is connected to the input shaft of said speed reducer 53, and the output shaft of said speed reducer 53 is connected to the top end of said stirring rod 54.

[0077] The baffle 51 is arranged on the quenching tank 1, which is used to prevent the material from flying and to provide support for the drive motor 52 and the speed reducer 53

[0078] The drive motor 52 provides power for the stirrer 5, which is installed on the baffle 51 and transmits power to the speed reducer 53 through the output shaft. The function of the speed reducer 53 is to reduce the output rotational speed of the drive motor 52 and increase the output torque.

[0079] When the drive motor 52 starts, its output shaft drives the input shaft of the speed reducer 53 to rotate. The speed reducer 53 reduces the rotational speed and increases the torque through internal gear or belt mechanism, and then transmits power to the top end of the stirring rod 54. The stirring rod 54 starts to rotate under the drive of the speed reducer 53. Since the stirring rod 54 is rotatably arranged inside the chamber 2, it will drive the quenching liquid in the chamber to mix and stir.

[0080] Through the stirring action of the stirrer 5, the temperature distribution of the quenching liquid is more uniform, which helps to improve the quality of the quenched parts.

[0081] As shown in Figure 1 In one embodiment, the quenching tank 1 is provided with two flow pipes 7 for the flow of quenching liquid, and the other ends of the flow pipes 7 are respectively connected to the corresponding ports of the external plate cooler.

[0082] The flow pipe 7 is a pipeline connecting the quenching tank 1 and the external plate cooler. The heated quenching liquid is pumped out of the quenching tank 1, transported to the external plate cooler for cooling, and then the cooled quenching liquid is sent back to the quenching tank 1, so as to realize the recycling of the quenching liquid.

[0083] The external plate cooler is a heat exchange equipment, which exchanges heat with the quenching liquid through the cooling medium such as water, air, etc. arranged inside, so as to reduce the temperature of the quenching liquid.

[0084] During the quenching process, the quenching liquid absorbs the heat released by the workpiece in the quenching tank 1 and heats up. In order to maintain the cooling effect of the quenching liquid, it is necessary to regularly or continuously pump out the heated quenching liquid from the quenching tank 1. At this time, the flow pipe 7 plays a key role.

[0085] Pumping-out stage: the heated quenching liquid is pumped out of the quenching tank 1 through the flow pipe 7 and enters the external plate cooler.

[0086] Cooling phase: in the external plate cooler, the quenching liquid exchanges heat with the cooling medium, and the temperature decreases.

[0087] Reflux phase: the cooled quenching liquid is sent back to the quenching tank 1 through the flow pipe 7, and continues to be used to cool the workpiece.

[0088] This process is cyclic, ensuring the continuous cooling effect of the quenching liquid during the quenching process.

[0089] In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0090] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the sentence "including a…" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0091] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A quenching device for steel processing, characterized by, It includes: Quenching tank (1) has a chamber (2) for storing quenching liquid inside; Filter cage (3) is arranged in the quenching tank (1) and used for placing workpieces; Lifting piece (4) is provided on the quenching tank (1), the lifting piece (4) is connected with the filter cage (3) for driving the filter cage (3) to lift and fall; A set of agitators (5) are oppositely arranged on the quenching tank (1) for driving the quenching liquid inside the chamber (2) to flow; The lifting piece (4) includes two electric push rods (41) oppositely arranged on the quenching tank (1), and two mounting plates (42) oppositely arranged on both sides of the filter cage (3), the piston rod of the electric push rod (41) is connected with the corresponding mounting plate (42).

2. The quenching device for steel processing according to claim 1, characterized in that: The quenching tank (1) is provided with a liquid supply pipe (11) for supplying quenching liquid and a liquid discharge valve (12) for discharging quenching liquid.

3. The quenching device for steel processing according to claim 1, characterized in that: The filter cage (3) includes a cage main body (31) formed by a plurality of filter screens, the cage main body (31) has a cavity inside for placing workpieces, and the top of the cage main body (31) is open; The filter cage (3) further includes a plurality of reinforcing ribs (32) distributed along the height of the cage main body (31).

4. The quenching device for steel processing according to claim 1, characterized in that: Two mounting grooves (6) are oppositely arranged on the quenching tank (1), and the electric push rod (41) is arranged in the corresponding mounting groove (6); Four mounting grooves (8) are oppositely arranged on the quenching tank (1), the four mounting grooves (8) are distributed in a rectangular shape, a guide rod (9) is arranged inside the mounting groove (8), and the top end of the guide rod (9) is connected with the mounting plate (42).

5. The quenching device for steel processing according to claim 4, characterized in that: The guide rod (9) includes an outer cylinder (91) and an inner cylinder (92) which are mutually sleeved, the top end of the inner cylinder (92) is fixedly connected with the inner bottom wall of the mounting groove (8), and the top end of the outer cylinder (91) is connected with the mounting plate (42).

6. The quenching device for steel processing according to claim 5, characterized in that: The top end of the outer cylinder (91) and the top end of the piston rod of the electric push rod (41) are both provided with a plurality of insertion rods (10), and a plurality of insertion holes which are matched with the insertion rods (10) are arranged on the mounting plate (42); The insertion rod (10) penetrates through the corresponding insertion hole and extends outward, and the insertion rod (10) and the mounting plate (42) are connected through bolts.

7. The quenching device for steel processing according to claim 1, characterized in that: The number of the set of agitators (5) is two; The agitator (5) includes: A baffle (51) arranged on the quenching tank (1), A drive motor (52) and a speed reducer (53) arranged on the baffle (51); An agitator rod (54) rotatably arranged inside the chamber (2). The output shaft of the driving motor (52) is connected with the input shaft of the speed reducer (53), and the output shaft of the speed reducer (53) is connected with the top end of the stirring rod (54).

8. The quenching device for steel processing according to claim 1, characterized in that: The quenching tank (1) is provided with two flow pipes (7) for the flow of quenching liquid, and the other ends of the flow pipes (7) are respectively communicated with the corresponding ports of the external plate cooler.

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