Steel ball quenching device

Abstract

The invention provides a steel ball quenching device which comprises a vertically-arranged hollow cylindrical machine body, a guide rail is arranged in the machine body and spirally arranged around the central axis of the machine body from top to bottom, a feeding mechanism is arranged at the top of the machine body, a discharging mechanism is arranged at the bottom of the machine body, a water inlet and a water outlet are further formed in the machine body, and a water pump is arranged at the water inlet. And the water inlet and the water outlet are simultaneously connected to the circulating cooling mechanism. The steel balls continuously and spirally descend from the interior of the machine body through the guide rails to make contact with a newly-added cooling medium, the steel balls are always evenly cooled, the quenching process is more stable, and the quenching effect is better; the steel balls are always limited by the guide rail, so that the conditions of mutual blocking and collision are avoided, and the quenching uniformity and the quality of all the steel balls are maintained; according to the continuous quenching device, no extra manual operation is needed, full-automatic continuous quenching can be achieved, the quenching efficiency is greatly improved, and meanwhile the operation difficulty is simplified.

Description

Technical Field

[0001] The invention relates to the technical field of steel material processing, and in particular to a steel ball quenching device. Background Art

[0002] Steel balls are important basic parts of modern industry, widely used in bearings, hardware, electronics, iron art, mechanical equipment, electricity, mining, metallurgy and other fields, playing a huge role in the development of the national economy. In terms of application, steel balls can be divided into two categories: wear-resistant steel balls used in the crushing industry and bearing steel balls used in the precision bearing industry. Wear-resistant steel balls (referred to as grinding balls) are the most widely used products in today's industrial practice; bearing steel balls have a long and extensive history of use in the precision bearing industry and life fields. It can be said that steel balls exist in most places where there is rotation.

[0003] Steel ball production methods generally include forging, rolling, semi-solid forming and casting. No matter which method is used to manufacture steel balls, heat treatment is required to ensure that they have sufficient mechanical properties and wear resistance. Quenching is an indispensable and important step in the heat treatment of steel balls, which is to heat the steel balls to a certain temperature to make them fully or partially austenitized, and then rapidly cool them at a cooling rate greater than the critical cooling rate to transform them into martensite.

[0004] The existing steel ball quenching device usually adopts a container to hold the steel ball, and then the container is placed in a quenching tank filled with a cooling medium, and the quenching effect is achieved by immersion in the cooling medium. For example, Chinese invention patent CN113637828A discloses a steel ball quenching device, including a tank filled with a cooling medium, a bracket immersed in the cooling medium with an upwardly extending suspension arm, the upper end of the suspension arm is hinged to the bracket, the bracket is connected to the driving mechanism, and the driving mechanism drives the bracket to perform a reciprocating swing around the hinge axis core, and a steel ball holding container is arranged on the bracket, and the steel ball holding container has a liquid permeable hole. The driving mechanism drives the bracket to perform a reciprocating swing around the hinge axis core, and the steel ball holding container arranged on it must also swing synchronously with it. During the turbulence of the bracket, the cooling medium is fully stirred, and the temperature of the cold medium at various places in the tank tends to be uniform and stable, which provides a stable and reliable environmental temperature for the steel balls to be quenched.

[0005] Although this method can achieve the quenching of steel balls, there are still some problems. First, the cooling medium will heat up rapidly during the quenching process. During the quenching process, the cooling medium is not at the same temperature, which may lead to the quenching effect of the steel balls being not good enough; second, when loading through the container, the steel balls will inevitably contact, collide, and pile up, which will not only cause some of the internal steel balls to have insufficient contact with the cooling medium, resulting in a decrease in the quenching effect, but also the high-temperature steel balls may cause damage to the surface when colliding, affecting the quality of the steel balls; third, this quenching process requires batch loading operations, and the overall process is discontinuous, resulting in cumbersome operations and low efficiency. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a steel ball quenching device, which solves the problems existing in the prior art such as the temperature rise of the quenching medium affecting the quenching effect, the collision of steel balls under high temperature state affecting the quality, and the cumbersome operation and low efficiency.

[0007] According to an embodiment of the present invention, a steel ball quenching device comprises a vertically arranged body, the body being a closed hollow cylindrical structure, a guide rail being arranged inside the body, the guide rail being arranged spirally from top to bottom around the central axis of the body, the guide rail limiting the steel ball so that the steel ball can only move along the guide rail after entering the guide rail, a feeding mechanism being arranged at the top of the body, the bottom end of the feeding mechanism being connected to the top end of the guide rail, a discharging mechanism being arranged at the bottom of the body corresponding to the bottom end of the guide rail;

[0008] The machine body is also provided with a water inlet and a water outlet, and a water pump is provided at the water inlet to continuously supply water to the interior of the machine body, and the water supply flow is made the same as the total water flow of the water outlet and the discharge mechanism corresponding to the guide rail at the bottom of the machine body, and the water inlet and the water outlet are connected to the circulating cooling mechanism at the same time.

[0009] Furthermore, the guide rail includes three track bars arranged in parallel, and the cross-sectional end points of the track bars form an acute triangle, so that the spherical steel ball can be completely confined inside, so that the steel ball will not escape from the confinement of the three track bars during the movement along the guide rail.

[0010] Furthermore, the track bar includes two inner tracks and one outer track, the inner tracks are closer to the center of the body than the outer tracks, the inner tracks are fixedly arranged, and the outer tracks are movably arranged, so that the outer tracks can move in the horizontal plane to adjust the distance between them and the inner tracks, thereby changing the size of the steel balls that the guide rail can accommodate.

[0011] Furthermore, a plurality of connecting rods are arranged on one side of the outer track away from the center of the machine body, and the connecting rods are arranged horizontally along the radial direction of the machine body, one end of the connecting rod is fixedly connected to the outer track, and the other end passes through the side wall of the machine body and extends to the outside;

[0012] An adjustment sleeve is provided on the outside of the body corresponding to the connecting rod. The adjustment sleeve is a hollow sleeve rod structure coaxially sleeved on the outside of the connecting rod. The adjustment sleeve is rotatably connected to the outer wall of the body, and a nut tightly sleeved on the outside of the connecting rod is fixedly provided on the inner wall of the adjustment sleeve. The connecting rod is a screw rod, and the nut cooperates with the screw rod to form a screw connection.

[0013] Furthermore, the adjusting sleeve is provided with a plurality of positioning holes on the side of the adjusting sleeve away from the machine body relative to the nut. The positioning holes are opened on the side of the adjusting sleeve and are arranged in sequence along the axial direction of the adjusting sleeve. Positioning pins are provided in the positioning holes, and the positioning pins penetrate the adjusting sleeve radially and extend into the interior of the adjusting sleeve.

[0014] Furthermore, the feeding mechanism is a feeding funnel, which is rotatably mounted on the top of the machine body, and the outlet size at the bottom of the feeding funnel corresponds to the diameter of the steel ball and is just connected to the inlet at the top of the guide rail.

[0015] Furthermore, the discharging mechanism includes a sieve plate arranged below the bottom end of the guide rail and a return water trough arranged below the sieve plate. The sieve plate is arranged at an angle, with its higher end corresponding to the outlet at the bottom end of the guide rail and its lower end extending to the outside of the machine body. A return water pipe is provided at the bottom of the return water trough, and the return water pipe is connected to the circulating cooling mechanism.

[0016] Furthermore, it also includes a screening mechanism arranged in cooperation with the discharging mechanism, the screening mechanism includes a limiting plate, baffles are arranged on both sides of the limiting plate, the spacing between the baffles is only enough for one steel ball to pass through at the same time, the limiting plate is horizontally arranged on the lowest side of the sieve plate, and the width of the sieve plate decreases from high to low, so that the bottom end corresponds to the width of the limiting plate;

[0017] The limiting plate is provided with a blocking door near the sieve plate, and the blocking door can be opened and closed in the vertical direction to control the passage of the steel ball. The blocking door is provided with a screening door that can be opened downward on the side away from the sieve plate. When the screening door is opened, a hole is formed for the steel ball to fall. An infrared thermometer is also provided on the side wall of the blocking door near the sieve plate. The detection direction of the infrared thermometer is toward the upper position of the internal limiting plate, and the infrared thermometer is electrically connected to the blocking door and the screening door respectively.

[0018] Furthermore, a rotating shaft is coaxially arranged inside the machine body, a top end of the rotating shaft extends out of the machine body and is connected to a driving motor, and a spiral blade is arranged on the rotating shaft.

[0019] Furthermore, the water inlet is arranged at the bottom of the side of the machine body, and the water outlet is arranged at the top of the side of the machine body.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the present invention, the steel ball is continuously spirally descended from the inside of the machine body through the guide rail, and the cooling medium is introduced into and discharged from the inside of the machine body through the water inlet and outlet, thereby forming a cyclic cooling structure. The cooling medium is in a continuous flow process, and the steel ball is always in contact with the newly added cooling medium when descending, so it is always cooled evenly, making the quenching process more stable and the quenching effect better;

[0022] 2. In the present invention, the steel balls are always limited by the guide rails and move downward along the guide rails. There is no other displacement process such as shaking and rotation. Therefore, there will be no mutual blocking or collision between the steel balls. The area of ​​the internal steel balls contacting the medium will not be affected due to dense accumulation, and the surface of the steel balls will not be damaged due to collision at high temperature, thereby maintaining the uniformity of quenching of all steel balls and the quality of the steel balls;

[0023] 3. The steel ball of the present invention can automatically fall along the guide rail under the action of gravity, and the quenching and cooling are completed in the process of passing through the machine body, without the need for additional manual operation, and can realize fully automated continuous quenching, which greatly improves the quenching efficiency and simplifies the operation difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0025] Figure 2 Schematic diagram of the specific structure of the guide rail in an embodiment of the present invention.

[0026] Figure 3 It is a schematic diagram of a radial cross section of a machine body in an embodiment of the present invention.

[0027] Figure 4 The figure is a schematic diagram of the installation of the connecting rod and the adjusting sleeve in the embodiment of the present invention.

[0028] Figure 5 It is a specific schematic diagram of the screening mechanism in an embodiment of the present invention.

[0029] In the above drawings: 1. machine body; 2. guide rail; 3. feed funnel; 4. sieve plate; 5. return water trough; 6. screening mechanism; 7. rotating shaft; 8. driving motor; 11. water inlet; 12. water outlet; 21. outer track; 22. inner track; 23. fixing rod; 24. connecting rod; 25. adjusting sleeve; 26. rotating bearing; 27. positioning pin; 51. return water pipe; 61. limiting plate; 62. baffle; 63. infrared thermometer; 64. blocking door; 65. screening door; 71. spiral blade; 251. nut; 252. positioning hole. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0031] like Figure 1 As shown, an embodiment of the present invention proposes a steel ball quenching device, including a vertically arranged body 1. In this embodiment, the body 1 is a closed hollow cylindrical structure. A guide rail 2 is arranged inside the body 1. The guide rail 2 is spirally arranged from top to bottom around the central axis of the body 1. The guide rail 2 limits the steel ball so that the steel ball can only move along the guide rail 2 after entering the guide rail 2. A feeding mechanism is provided on the top of the body 1, and the bottom end of the feeding mechanism is connected to the top end of the guide rail 2. A discharging mechanism is provided at the bottom of the body 1, and the discharging mechanism is arranged corresponding to the bottom end of the guide rail 2.

[0032] The machine body 1 is also provided with a water inlet 11 and a water outlet 12, respectively. A water pump is provided at the water inlet 11 to continuously supply water to the inside of the machine body 1. Considering that the machine body 1 in this embodiment also has openings at the inlet corresponding to the guide rail 2 at the top and the outlet corresponding to the guide rail 2 at the bottom, the opening at the bottom of the guide rail 2 corresponding to the bottom of the machine body 1 will also drain water. Therefore, when the water supply flow is the same as the total water flow of the water outlet 12 and the discharge mechanism corresponding to the guide rail 2 at the bottom of the machine body 1, the water level inside the machine body 1 can be maintained unchanged and always in a full state. Preferably, the water inlet 11 in this embodiment is arranged at the bottom of the side of the machine body 1, and the water outlet 12 is arranged at the top of the side of the machine body 1, that is, the newly added cooling medium with a lower temperature moves from bottom to top, and the temperature gradually increases during the rising process, while the temperature of the high-temperature steel ball gradually decreases during the descending process, then the low-temperature steel ball at the bottom of the machine body 1 encounters the low-temperature cooling medium, and the high-temperature steel ball at the top of the machine body 1 encounters the high-temperature cooling medium, and the temperature difference between the steel ball and the cooling medium is more stable and average, so that the quenching effect is more uniform. In order to achieve continuous injection of water flow, the water inlet 11 and the water outlet 12 are simultaneously connected to a circulating cooling mechanism. In this embodiment, the circulating cooling mechanism adopts a tube-type air cooling device, which is a common technology and is not described in detail in this embodiment. It should be noted that the cooling medium in this embodiment is not limited to water, and oil or other coolants can also be used.

[0033] like Figure 2As shown, the guide rail 2 in the embodiment of the present invention includes three rail bars arranged in parallel, and the three rail bars spirally descend around the central axis of the machine body 1 at the same time. The cross-sectional end points of the rail bars form an acute triangle, so that the steel ball of the spherical structure can be completely limited inside, so that the steel ball will not escape from the limit of the three rail bars during the movement along the guide rail 2. Further, the rail bar includes two inner rails 22 and an outer rail 21, and the inner rail 22 is closer to the center of the machine body 1 than the outer rail 21, wherein the two inner rails 22 are fixedly arranged on the inner wall of the machine body 1 by a fixing rod 23, and the outer rail 21 is movably arranged, so that the outer rail 21 can be moved in the horizontal plane to adjust the distance between it and the inner rail 22, thereby changing the size of the steel ball that the guide rail 2 can accommodate. In this way, it can be flexibly adjusted according to the size of the steel ball to be quenched, so that the inscribed circle surrounded by the three rail bars just corresponds to the diameter of the steel ball, so that the device can be used for the quenching processing of steel balls of various sizes, thereby improving its applicability.

[0034] like Figure 3 , Figure 4 As shown, in a specific scheme, a plurality of connecting rods 24 are arranged on one side of the outer track 21 away from the center of the body 1. The connecting rods 24 are arranged horizontally along the radial direction of the body 1. One end of the connecting rod 24 is fixedly connected to the outer track 21, and the other end passes through the side wall of the body 1 and extends to the outside. An adjustment sleeve 25 is arranged on the outside of the body 1 corresponding to the connecting rod 24. The adjustment sleeve 25 is a hollow sleeve rod structure coaxially sleeved on the outside of the connecting rod 24. A rotating bearing 26 is arranged between the adjustment sleeve 25 and the outer wall of the body 1. The adjustment sleeve 25 is installed on the outer wall of the body 1 so that it can only rotate. A nut 251 tightly sleeved on the outside of the connecting rod 24 is fixedly arranged on the inner wall of the adjustment sleeve 25. The connecting rod 24 is a screw rod, and the nut 251 cooperates with the screw rod to form a screw connection. When the adjustment sleeve 25 rotates, the nut 251 rotates synchronously, that is, the connecting rod 24 is driven to move axially by the screw rod connection, thereby completing the adjustment of the outer track 21.

[0035] Furthermore, the adjusting sleeve 25 is provided with a plurality of positioning holes 252 on the side away from the body 1 relative to the nut 251. The positioning holes 252 are provided on the side of the adjusting sleeve 25 and are sequentially arranged along the axial direction of the adjusting sleeve 25. A positioning pin 27 is provided in the positioning hole 252. The positioning pin 27 penetrates the adjusting sleeve 25 radially and extends into the adjusting sleeve 25. Obviously, when the positioning pin 27 is inserted, it is equivalent to shortening the internal length of the adjusting sleeve 25, so that the distance that the adjusting sleeve 25 can extend outward from the connecting rod 24 changes, thereby limiting the adjustment position of the connecting rod 24. In this way, the actual moving distance of the connecting rod 24 can be accurately located, avoiding errors in the manual rotation adjustment process, resulting in inadequate adjustment, and the problem that the steel ball cannot enter the guide rail 2 or is detached from the guide rail 2.

[0036] In this embodiment, since multiple connecting rods 24 are fixed at the same time, if only one connecting rod 24 is adjusted at a time, it is necessary to consider the fixation of the other connecting rods 24 to the outer track 21. However, since the outer track 21 is made of elastic materials such as steel, it is possible to move one connecting rod 24 a small amount each time. In order to better achieve the technical purpose, a micro motor can also be set outside the adjustment sleeve 25, directly connected or driven to rotate the adjustment sleeve 25 by gear connection, and then all the micro motors are electrically controlled to work at the same time, so that all the connecting rods 24 can move synchronously, so that there will be no problem that when one connecting rod 24 is adjusted alone, the other connecting rods 24 will still fix the outer track 21.

[0037] In the embodiment of the present invention, a rotating shaft 7 is coaxially arranged inside the machine body 1, the top end of the rotating shaft 7 extends out of the machine body 1 and is connected to a driving motor 8, and a spiral blade 71 is arranged on the rotating shaft 7. The rotating shaft 7 and the spiral blade 71 are both located inside the spirally surrounded area of ​​the guide rail 2. When the rotating shaft 7 rotates, the spiral blade 71 drives the internal cooling medium to rotate, realizing the spiral ascending process, which corresponds to the spiral descending direction of the steel ball, so that the cooling medium and the steel ball are more fully combined, and the quenching effect is better.

[0038] In a preferred embodiment, the feeding mechanism is a feeding hopper 3, which is rotatably mounted on the top of the machine body 1. The outlet size at the bottom of the feeding hopper 3 corresponds to the diameter of the steel ball and is just connected to the top entrance of the guide rail 2. The feeding hopper 3 can also be driven by a working motor to rotate continuously, so that when the steel ball is directly added from above, the rotation of the feeding hopper 3 can avoid clogging, so that the steel ball can enter the guide rail 2 more smoothly.

[0039] Correspondingly, the discharging mechanism includes a sieve plate 4 arranged below the bottom end of the guide rail 2 and a return water tank 5 arranged below the sieve plate 4. The sieve plate 4 is arranged obliquely, and its higher end corresponds to the outlet at the bottom end of the guide rail 2, and the lower end extends to the outside of the machine body 1. A return water pipe 51 is arranged at the bottom of the return water tank 5, and the return water pipe 51 is connected to the circulating cooling mechanism. Because the bottom end of the guide rail 2 will also open to allow the internal cooling medium to flow out, the sieve plate 4 is arranged below. When the steel ball leaves the inside of the machine body 1 through the guide rail 2, it falls on the guide rail 2 and then leaves toward the lower roller, and the outflowing cooling medium passes through the sieve plate 4 into the return water tank 5, and then returns to the circulating cooling mechanism through the return water pipe 51 for recycling. In this way, a circulating cooling quenching system is formed that does not waste extra cooling medium and does not pollute the factory floor.

[0040] like Figure 5As shown, in a further scheme, a screening mechanism 6 is also provided in cooperation with the discharging mechanism, the screening mechanism 6 includes a limiting plate 61, baffles 62 are provided on both sides of the limiting plate 61, the spacing between the baffles 62 is only enough for one steel ball to pass through at the same time, the limiting plate 61 is horizontally arranged on the lowest side of the screen plate 4, and the width of the screen plate 4 decreases from high to low, so that the bottom end corresponds to the width of the limiting plate 61. That is, after the steel ball falls from the guide rail 2 onto the screen plate 4, it gradually shrinks as the width of the screen plate 4 decreases when rolling downward, and finally only one steel ball passes through each time and enters the limiting plate 61 in turn.

[0041] The limiting plate 61 is provided with a blocking door 64 near the sieve plate 4. The blocking door 64 can be opened and closed in the vertical direction to control the passage of the steel ball. The blocking door 64 is provided with a screening door 65 that can be opened downward on the side away from the sieve plate 4. When the screening door 65 is opened, a hole is formed for the steel ball to fall. The side wall of the blocking door 64 near the sieve plate 4 is also provided with an infrared thermometer 63. The detection direction of the infrared thermometer 63 is toward the upper position of the limiting plate 61 inside. The infrared thermometer 63 is electrically connected to the blocking door 64 and the screening door 65 respectively. After each steel ball enters the limiting plate 61 from the sieve plate 4, it will be blocked by the blocking door 64 on the side of the infrared thermometer 63. When it passes through the infrared thermometer 63, its temperature will be detected. The quenching condition of the steel ball is judged by its real-time temperature. If the temperature is obviously not in the normal range, it means that the quenching process is not up to standard. At this time, the blocking door 64 rises and then drops quickly, allowing only one steel ball after temperature measurement to pass. Then the screening door 65 is opened, and the steel balls fall through the holes below, thus being screened out and collected for further processing. If the detected temperature is within the normal range, the screening door 65 is not opened, and the steel balls roll from the limiting plate 61 to the end and enter the qualified product collection area, and after collection, they are transported to the next process for processing.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A steel ball quenching device, characterized in that: It includes a vertically arranged machine body, which is a closed hollow cylindrical structure, a guide rail is arranged inside the machine body, and the guide rail is spirally arranged from top to bottom around the central axis of the machine body, and the guide rail limits the steel ball so that the steel ball can only move along the guide rail after entering the guide rail, a feeding mechanism is arranged on the top of the machine body, and the bottom end of the feeding mechanism is connected to the top end of the guide rail, and a discharging mechanism is arranged at the bottom of the machine body, and the discharging mechanism is arranged corresponding to the bottom end of the guide rail; The machine body is also provided with a water inlet and a water outlet, and a water pump is provided at the water inlet to continuously supply water to the interior of the machine body, and the water supply flow is made the same as the total water flow of the water outlet and the discharge mechanism corresponding to the guide rail at the bottom of the machine body, and the water inlet and the water outlet are connected to the circulating cooling mechanism at the same time.

2. A steel ball quenching device as claimed in claim 1, characterized in that: The guide rail includes three track bars arranged in parallel, and the cross-sectional end points of the track bars form an acute triangle, so that the spherical steel ball can be completely confined inside, so that the steel ball will not escape from the confinement of the three track bars when moving along the guide rail.

3. A steel ball quenching device as claimed in claim 2, characterized in that: The track bar includes two inner tracks and one outer track. The inner tracks are closer to the center of the body than the outer tracks. The inner tracks are fixed and the outer tracks are movably arranged, so that the outer track can move in a horizontal plane to adjust the distance between it and the inner track, thereby changing the size of the steel balls that the guide rail can accommodate.

4. A steel ball quenching device as claimed in claim 3, characterized in that: A plurality of connecting rods are arranged on one side of the outer track away from the center of the machine body. The connecting rods are arranged horizontally along the radial direction of the machine body. One end of the connecting rod is fixedly connected to the outer track, and the other end passes through the side wall of the machine body and extends to the outside. An adjustment sleeve is provided on the outside of the body corresponding to the connecting rod. The adjustment sleeve is a hollow sleeve rod structure coaxially sleeved on the outside of the connecting rod. The adjustment sleeve is rotatably connected to the outer wall of the body, and a nut tightly sleeved on the outside of the connecting rod is fixedly provided on the inner wall of the adjustment sleeve. The connecting rod is a screw rod, and the nut cooperates with the screw rod to form a screw connection.

5. A steel ball quenching device as claimed in claim 4, characterized in that: The adjusting sleeve is also provided with a plurality of positioning holes on the side of the adjusting sleeve away from the machine body relative to the nut. The positioning holes are opened on the side of the adjusting sleeve and are arranged in sequence along the axial direction of the adjusting sleeve. Positioning pins are arranged in the positioning holes. The positioning pins penetrate the adjusting sleeve radially and extend into the interior of the adjusting sleeve.

6. A steel ball quenching device as claimed in claim 1, characterized in that: The feeding mechanism is a feeding funnel, which is rotatably mounted on the top of the machine body. The outlet size at the bottom of the feeding funnel corresponds to the diameter of the steel ball and is just connected to the inlet at the top of the guide rail.

7. A steel ball quenching device as claimed in claim 1, characterized in that: The discharging mechanism includes a sieve plate arranged below the bottom end of the guide rail and a return water trough arranged below the sieve plate. The sieve plate is arranged obliquely, with its higher end corresponding to the outlet at the bottom end of the guide rail and its lower end extending to the outside of the machine body. A return water pipe is provided at the bottom of the return water trough, and the return water pipe is connected to the circulating cooling mechanism.

8. A steel ball quenching device as claimed in claim 7, characterized in that: It also includes a screening mechanism arranged in cooperation with the discharging mechanism, the screening mechanism including a limiting plate, baffles are arranged on both sides of the limiting plate, the spacing between the baffles is only enough for one steel ball to pass through at the same time, the limiting plate is horizontally arranged on the lowest side of the sieve plate, and the width of the sieve plate decreases from high to low, so that the bottom end corresponds to the width of the limiting plate; The limiting plate is provided with a blocking door near the sieve plate, and the blocking door can be opened and closed in the vertical direction to control the passage of the steel ball. The blocking door is provided with a screening door that can be opened downward on the side away from the sieve plate. When the screening door is opened, a hole is formed for the steel ball to fall. An infrared thermometer is also provided on the side wall of the blocking door near the sieve plate. The detection direction of the infrared thermometer is toward the upper position of the internal limiting plate, and the infrared thermometer is electrically connected to the blocking door and the screening door respectively.

9. A steel ball quenching device as claimed in claim 1, characterized in that: A rotating shaft is coaxially arranged inside the machine body, the top end of the rotating shaft extends out of the machine body and is connected to a driving motor, and spiral blades are arranged on the rotating shaft.

10. A steel ball quenching device as claimed in claim 1, characterized in that: The water inlet is arranged at the bottom of the side surface of the machine body, and the water outlet is arranged at the top of the side surface of the machine body.

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