A production line and production process for liquid-air intermittent quenching of forged grinding balls based on the Internet of Things

Abstract

The present invention relates to the field of metal heat treatment technology, and specifically discloses a liquid-air intermittent quenching production line for forged grinding balls based on the Internet of Things, comprising at least two liquid quenching devices and at least two air quenching devices, the liquid quenching devices and the air quenching devices are alternately arranged, each liquid quenching device and the air quenching device comprises a screw propeller and a temperature acquisition module, the temperature acquisition module is used to collect the grinding ball temperature at the output end of the corresponding liquid quenching device or the air quenching device, and also comprises a control system, all temperature acquisition modules are connected to the control system, and the control system can control the speed of the screw propeller when the real-time grinding ball temperature collected by the temperature acquisition module deviates from the system preset grinding ball temperature. This scheme is used to solve the problems of inaccurate temperature control and inconvenient backtracking of process parameters in the heat treatment process technology in the prior art, resulting in inconsistent grinding ball quenching quality and low yield rate.

Description

Technical Field

[0001] The invention relates to the technical field of metal heat treatment, and in particular to a forging grinding ball liquid-air intermittent quenching production line and a production process based on the Internet of Things. Background Art

[0002] Grinding balls are one of the most important grinding media widely used in various grinding equipment (such as ball mills, etc.). In recent years, R&D personnel from various places have conducted a large number of experimental studies on grinding ball materials, which have improved the performance and quality of grinding balls to a certain extent. However, whether the heat treatment process of grinding balls is reasonable and scientific also directly affects the use effect and life of grinding balls. There are two main ways to improve the performance of grinding balls: one is to deliberately add some alloy elements to the raw materials of grinding balls, that is, to use alloying measures to improve the performance of steel; the other measure is to heat treat the forged grinding balls to change their structure, so as to obtain the required performance. Through heat treatment, the potential of grinding balls can be fully utilized and the performance and service life of grinding balls can be improved.

[0003] At present, the heat treatment process for forged grinding balls mostly adopts liquid-air intermittent quenching (that is, a quenching and cooling method in which water quenching and air cooling are alternately performed, and water quenching is also called liquid quenching). Through this process, more martensite (or lower bainite) structures can be obtained, thereby meeting the quenching and cooling requirements of different grinding ball products.

[0004] In the production of liquid-air intermittent quenching, the current digital control level of the existing domestic forged grinding ball liquid-air intermittent quenching production line is low. Most companies have problems such as simple quenching process formulation (such as multiple water-cooled quenching devices are controlled separately), simple quenching process execution and recording, poor process controllability and traceability, and cannot perform digital real-time control of the entire quenching cooling process. The key factor for the success of the liquid-air intermittent quenching method lies in the accuracy of the water quenching and air cooling process control, especially if the temperature control of the water quenching and air cooling is not good, it will cause problems such as poor quenching quality, uneven product quality and low product yield. Summary of the invention

[0005] The present invention aims to provide a forged grinding ball liquid-air intermittent quenching production line based on the Internet of Things to solve the problems of poor grinding ball quenching quality and low yield rate caused by inaccurate water quenching and air cooling temperature control in the current grinding ball liquid-air intermittent quenching.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] A forged grinding ball liquid-air intermittent quenching production line based on the Internet of Things comprises at least two liquid quenching devices and at least two air quenching devices, wherein the liquid quenching devices and the air quenching devices are alternately arranged, and each of the liquid quenching devices and the air quenching devices comprises a screw propeller and a temperature acquisition module, wherein the temperature acquisition module is used to acquire the grinding ball temperature at the output end of the corresponding liquid quenching device or the air quenching device, and further comprises a control system, wherein all the temperature acquisition modules are connected to the control system, and the control system can control the rotation speed of the screw propeller when the real-time grinding ball temperature acquired by the temperature acquisition module deviates from the grinding ball temperature preset by the system.

[0008] The principle and advantage of this scheme are as follows: in actual application, this scheme realizes the control of the quenching process of forged grinding balls through the control system. After the quenching of each quenching device (including the liquid quenching device and the air quenching device) is completed, if the real-time grinding ball temperature collected by the temperature acquisition module deviates from the preset grinding ball temperature of the control system, the speed of the screw propeller of the quenching device that produces the temperature deviation is controlled. For example, when the real-time grinding ball temperature collected by the temperature acquisition module is lower than the preset grinding ball temperature of the system, the speed of the screw propeller of the corresponding quenching device is controlled to increase, and the time for the grinding ball to stay in the quenching device is reduced; otherwise, the speed of the screw propeller of the corresponding quenching device is reduced. The adoption of this scheme enables the temperature of the entire process of liquid-air intermittent quenching of forged grinding balls to be monitored in real time through the Internet of Things, and can be timely fed back and regulated through the control system to ensure the accuracy of the quenching time of liquid quenching and air quenching and the temperature of the grinding balls after quenching, thereby solving the problems of poor quenching quality, uneven product quality and low product yield caused by poor quenching temperature control in the prior art.

[0009] In addition, through the setting of the control system, the temperature of the grinding ball production process can be recorded, which facilitates the traceability of the grinding ball production and realizes the intelligent upgrade of the company's grinding ball production.

[0010] Preferably, as an improvement, the liquid quenching device also includes a cooling tank, the liquid quenching device has a plurality of spiral propellers, some of the multiple spiral propellers of the liquid quenching device are arranged at an angle in the cooling tank, and the remaining spiral propellers are arranged horizontally in the cooling tank, the horizontally arranged spiral propellers are located on both sides of the inclined spiral propellers, the grinding balls are sandwiched and propelled by the adjacent horizontal spiral propellers and the inclined spiral propellers, and the grinding balls rotate during the propelling process.

[0011] Beneficial effect: In the prior art, for the liquid-air intermittent production of forged grinding balls, there are two methods, one is to stack multiple grinding balls in a quenching basket and then immerse them uniformly for liquid quenching (such as a bainite-martensite complex phase steel / iron graded isothermal quenching heat treatment method and device with patent publication number CN104561462B), and the other is to use a single screw propeller to propel the grinding balls in the cooling tank (such as a spiral heat treatment propulsion device for grinding balls with patent announcement number CN2813630Y). Although the former can realize liquid-air alternating quenching of multiple grinding balls after simply lifting and lowering the quenching basket, the grinding balls in the quenching basket are in contact with each other, resulting in the grinding balls not being completely and rapidly cooled by the cooling medium, that is, not being able to achieve uniform cooling, resulting in uneven hardness of the grinding balls, which is prone to high wear and poor toughness of the grinding balls during use, reducing the use effect and service life of the grinding balls; and although the latter reduces the problem caused by the contact between the grinding balls, the grinding balls are always in contact with the bottom of the cooling tank for a long time, and there is still the problem that the grinding balls cannot be uniformly cooled. In this scheme, multiple spiral propellers are set to clamp and propel the grinding balls, so that multiple grinding balls can be liquid quenched at the same time, ensuring the quenching efficiency. At the same time, the grinding balls are no longer in contact with the cooling tank. The continuously rotating spiral propellers drive the grinding balls to be liquid quenched in a manner of rising with the inclined spiral propellers while rotating, ensuring the overall cooling uniformity of the grinding balls during the entire liquid quenching process.

[0012] In addition, due to the presence of the inclined screw propeller, the grinding ball is completely immersed in the cooling medium when it first enters the liquid quenching device, and gradually exposes the cooling medium during the continuous rotation and lifting of the grinding ball. In the process of liquid quenching, it is also divided into three stages: pure liquid quenching stage, liquid-air quenching coexistence stage and pure air quenching, so that the surface temperature of the grinding ball gradually rises, and the temperature and structure of the inside and outside of the grinding ball are uniform, avoiding the rapid cooling and heating transformation of the grinding ball caused by the direct pure air quenching after the pure liquid quenching (for example, the cooling medium temperature during the first liquid quenching is about 10°C, and the cooling medium of the air quenching is 20-25°C. If the air quenching is performed after the direct liquid quenching, there is a temperature difference of 10-15°C). On the one hand, the rapid cooling and heating changes of the grinding ball are easy to cause the expansion of the residual austenite after transformation, making the grinding ball easy to crack, increase brittleness and easy to break; on the other hand, rapid cooling and heating are also easy to cause irregular cooling curves and uneven structural transformation, which in turn affects the mechanical properties of the grinding ball, making the strength and toughness of the grinding ball mismatched, causing quality problems of the grinding ball.

[0013] In addition, the spiral blades of the spiral propeller located in the cooling tank propel the grinding balls while also stirring the cooling medium in the cooling tank, making the temperature of the cooling medium in the cooling tank more uniform.

[0014] Preferably, as an improvement, the liquid quenching device further comprises a sprayer arranged above the screw propeller, and a water outlet is provided in the cooling tank to facilitate the discharge of the cooling medium.

[0015] Beneficial effects: Since the cooling medium in the cooling tank is in direct contact with the grinding balls, it is easier to heat up. If the cooling medium in the cooling tank is not replaced, the cooling medium will continue to heat up, resulting in different quality of grinding balls produced in successive batches. The scheme sets a sprayer so that the sprayer always sprays cooling medium of the set temperature into the cooling tank, ensuring that the temperature variation range of the cooling medium in the cooling tank is small and the quality consistency of grinding balls produced in successive batches is ensured. In addition, the sprayer sprays cooling medium from above the spiral propeller, and the cooling medium is blocked by the spiral propeller and scattered to different places in the cooling tank, which is equivalent to injecting new cooling medium from different places in the cooling tank, which is conducive to uniform cooling of the cooling medium in the cooling tank.

[0016] Preferably, as an improvement, the distance between the horizontal screw propeller and the inclined screw propeller in the liquid quenching device can be adjusted.

[0017] Beneficial effect: This solution enables the liquid quenching device to adapt to the liquid quenching requirements of grinding balls of different specifications by adjusting the distance, thereby improving the practicality of this solution.

[0018] Preferably, as an improvement, the blades of the inclined screw propeller in the liquid quenching device are staggered with the blades of the adjacent horizontal screw propeller.

[0019] Beneficial effect: This solution allows the distance between the horizontal screw propeller and the inclined screw propeller to be adjusted in a wider range by staggering the blades, and can adapt to the production of grinding balls with smaller specifications.

[0020] Preferably, as an improvement, the air quenching device comprises at least two parallel screw propellers, all the screw propellers of the air quenching device rotate in the same direction but the blades rotate in opposite directions, and the screw propellers of the air quenching device are arranged at an angle.

[0021] Beneficial effect: This solution allows the grinding balls to be propelled between adjacent and parallel screw propellers. During the propulsion process, the grinding balls rotate under the action of two screw propellers with the same rotation direction, ensuring that the grinding balls can evenly exchange heat with the outside air during air quenching.

[0022] In addition, the screw propeller of the air quenching device is arranged at an angle, so that the air quenching path can be longer when the occupied area is the same.

[0023] Preferably, as an improvement, it also includes a mist quenching device located at the output end of the last air quenching device. The mist quenching device has the same structure as the liquid quenching device. The mist quenching device is provided with an atomizer above the screw propeller on the basis of the liquid quenching device, and the atomizer sprays mist cooling medium toward the grinding balls.

[0024] Beneficial effect: Through the setting of the mist quenching device, the cooling medium sprayed onto the grinding balls can be evenly cooled without droplet aggregation, and finally slowly cooled to room temperature.

[0025] Preferably, as an improvement, it also includes a circulating cooling purification pool, which includes multiple water supply areas and return water areas. The water supply area is used to provide new cooling medium to the cooling tank, and the return water area is used to recover the cooling medium that has been heated in the cooling tank. The cooling medium used by the front liquid quenching device can enter the water supply area used in conjunction with the next liquid quenching device after filtration after entering the return water area. The water supply area is provided with a temperature sensor, a cooler and a heater. The temperature sensor, the cooler and the heater are all connected to the control system. The temperature sensor is used to collect the water temperature of the corresponding water supply area. The control system can control the start and stop of the cooler or heater when the real-time water temperature collected by the temperature sensor deviates from the system preset water temperature.

[0026] Beneficial effects: During the entire quenching process, there will be more than one level of liquid quenching and air quenching according to the specifications and materials of the grinding balls. The temperature of the cooling medium used for the front liquid quenching is lower than that of the cooling medium for the rear liquid quenching. This solution uses a circulating temperature sensor, a heater and a cooler to achieve real-time monitoring and feedback control of the temperature in the water supply area, thereby ensuring the accuracy of the water temperature in the water supply area and the quality of grinding ball quenching. In addition, through the setting of this solution, the cooling medium after the front liquid quenching can utilize the residual temperature as the cooling medium for the rear liquid quenching, thereby realizing the recycling of the cooling medium and the reuse of the residual temperature on the cooling medium, which is conducive to green production.

[0027] Preferably, as an improvement, it further comprises a vibration device located at the output end of the mist quenching device, the vibration device comprises a vibrating screen and a compressed gas injector arranged above the vibrating screen, and the nozzle of the compressed gas injector faces the vibrating screen.

[0028] Beneficial effect: When this solution is adopted, the quenched grinding balls fall onto the vibrating screen of the vibrating device, and the oxide scale and other adhesives on the surface of the grinding balls are removed from both the upper and lower sides of the grinding balls through the compressed air ejector and the vibrating screen.

[0029] Preferably, as an improvement, the vibration device also includes a driver and a spring, the spring is tilted, the top of the spring is fixedly connected to the vibrating screen, the driver is used to compress the spring, the vibrating screen is tilted, the vibrating screen is tilted downward at one end close to the output end of the mist quenching device, and the spring is tilted upward at one end toward the vibrating screen.

[0030] Beneficial effect: This solution enables the grinding balls to stay on the vibrating screen for a longer time by setting the inclined spring and the inclined vibrating screen, so that the oxide scale and adhesive on the surface of the grinding balls can be removed more thoroughly.

[0031] This technology also provides a production process for liquid-air intermittent quenching of forged grinding balls based on the Internet of Things, including the following steps:

[0032] S1, debugging equipment: obtaining the cooling process route of the grinding ball quenching process according to the grinding ball composition and specifications, the cooling process route reflects the grinding ball temperature after different quenching stages, and the control system can call the cooling process route and control the grinding ball quenching process in real time according to the cooling process route;

[0033] S2, liquid quenching: the grinding balls are pushed by a liquid quenching device with multiple screw propellers, some of the multiple screw propellers of the liquid quenching device are arranged obliquely in the cooling tank of the liquid quenching device, and the remaining screw propellers are arranged horizontally in the cooling tank, and the horizontally arranged screw propellers are located on both sides of the inclined screw propellers. The grinding balls are sandwiched and pushed by the adjacent horizontal screw propellers and the inclined screw propellers, and the grinding balls rotate during the pushing process; the temperature of the grinding balls after the liquid quenching is completed is collected and transmitted to the control system, and the control system controls the speed of the screw propeller of the liquid quenching device after the temperature of the grinding balls after the liquid quenching is deviated from the corresponding preset temperature on the cooling process route;

[0034] S3, air quenching: after the liquid quenching is completed, the ball enters the air quenching device for air quenching. The air quenching device includes at least two parallel screw propellers. The grinding balls for air quenching are lifted and pushed by two adjacent screw propellers on the air quenching device. During the air quenching process, the grinding balls rotate. The temperature of the grinding balls after the air quenching is collected and transmitted to the control system. The control system controls the speed of the screw propeller of the air quenching device after the grinding ball temperature after the air quenching deviates from the corresponding preset temperature on the cooling process route. The number of liquid quenching and air quenching is set accordingly according to the cooling process route, and liquid quenching and air quenching are set alternately.

[0035] S4, mist quenching: after the last air quenching is completed, the grinding balls are mist quenched by a mist quenching device. The structure of the mist quenching device is the same as that of the liquid quenching device. The temperature of the cooling medium used by the mist quenching device is higher than the temperature of the cooling medium during the last air quenching. During the mist quenching, an atomizer is installed above the screw propeller of the mist quenching device, and the atomizer sprays the cooling medium in a mist form toward the grinding balls. The temperature of the grinding balls after the mist quenching is collected and transmitted to the control system. The control system controls the speed of the screw propeller of the mist quenching device after the grinding ball temperature after the mist quenching deviates from the corresponding preset temperature on the cooling process route.

[0036] S5, after quenching, remove the oxide scale and other adhesives on the surface of the grinding ball.

[0037] This technical solution can realize Internet of Things control of the grinding ball quenching process through real-time collection and transmission of the grinding ball temperature during liquid quenching, air quenching and mist quenching, realize real-time monitoring and timely feedback of the production process, ensure the accurate implementation of the cooling process route, ensure the temperature of the grinding balls after quenching at each stage, ensure the quality of the grinding balls after quenching, and achieve consistency in the quality of the grinding balls produced before and after, avoid operating errors by workers, and improve production efficiency.

[0038] In addition, the liquid quenching device, mist quenching device and air quenching device of the present solution enable the grinding balls to rotate during the entire quenching process, thereby ensuring the uniformity of the cooling of the grinding balls as a whole during the entire quenching process. In addition, during the liquid quenching and mist quenching stages, the grinding balls are gradually exposed to the cooling medium as they rotate and move upward, so that both the liquid quenching process and the air quenching process have three stages: the pure liquid quenching stage, the liquid and air quenching coexistence stage and the pure air quenching stage, so that the surface temperature of the grinding balls gradually rises, achieving the uniformity of the temperature and structure inside and outside the grinding balls, and avoiding the problem of failing to achieve the required grinding ball quality due to the rapid cooling and heating transition of the grinding balls caused by the direct pure air quenching after the pure liquid quenching.

[0039] Preferably, as an improvement, a forging heating step is further provided between steps S1 and S2, wherein the forged grinding balls are placed in a temperature furnace for heating and heat preservation; the temperature furnace adopts a segmented design, and the temperature furnace is divided into an introduction zone, a buffer zone and a heating zone which are separated from each other and arranged in sequence, the forged grinding balls first enter the introduction zone, and the grinding balls discharged from the heating zone enter S2 to begin quenching.

[0040] Beneficial effects: This solution divides the temperature furnace into sections so that the forged grinding balls can be sent to quenching in batches. The sectioned setting of the temperature furnace ensures that the temperature of all grinding balls before quenching is the same, ensuring that the quenching quality of the grinding balls is not affected by the initial temperature. The setting of the buffer area can minimize the temperature loss of the grinding balls. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1Schematic diagram of a three-dimensional structure of an embodiment of the present invention.

[0042] Figure 2 for Figure 1 Front cross-sectional view of a medium temperature furnace.

[0043] Figure 3 for Figure 1 Top view of the medium liquid quenching device.

[0044] Figure 4 for Figure 1 Front cross-sectional view of the intermediate liquid quenching device.

[0045] Figure 5 for Figure 1 Top view of the hollow quenching device.

[0046] Figure 6 for Figure 1 Front view of the hollow quenching device.

[0047] Figure 7 for Figure 1 Schematic diagram of the three-dimensional structure of the vibration device from another perspective. DETAILED DESCRIPTION

[0048] The following is further described in detail through specific implementation methods:

[0049] The figure marks in the drawings of the specification include: industrial robot 1, temperature furnace 2, liquid quenching device 3, air quenching device 4, mist quenching device 5, vibrating screen 6, circulating cooling purification pool 7, control system 8, partition 21, insulation board 22, temperature meter 23, heating resistance wire 24, cooling trough 31, screw propeller 32, transmission channel 33, water supply pipe 34, water outlet pipe 35, propulsion channel 41, guide groove 9, vibrating screen 61, driver 62, spring 63, injection pipe 64, conveyor belt 10, water supply area 71, return water area 72, filter 73.

[0050] The embodiment is basically as shown in the attached Figures 1 to 7As shown, a liquid-air intermittent quenching production line for forged grinding balls based on the Internet of Things includes an industrial robot 1, a temperature furnace 2 with a temperature adjustment function, at least two liquid quenching devices 3, at least two air quenching devices 4, a mist quenching device 5, a vibration device, a circulating cooling purification pool 7 and a control system 8. The industrial robot 1 is used to send the forged grinding balls to the temperature furnace 2 for heat preservation. When the grinding balls are quenched, the grinding balls are discharged from the temperature furnace 2 to the liquid quenching device 3. The liquid quenching devices 3 and the air quenching devices 4 are alternately arranged. All liquid quenching devices 3 have the same structure, and all air quenching devices 4 have the same structure; the mist quenching device 5 is installed at the output end of the last air quenching device 4, and the vibration device is installed at the output end of the mist quenching device 5. The circulating cooling purification pool 7 is connected to all liquid quenching devices 3 and mist quenching devices 5. The circulating cooling purification pool 7 is used to control the temperature and recycle the cooling medium used in the liquid quenching device 3 and the mist quenching device 5. The temperature furnace 2, the liquid quenching device 3, the air quenching device 4, the mist quenching device 5 and the circulating cooling pool are all connected to the control system 8. This embodiment takes two liquid quenchings and two air quenchings as examples.

[0051] The specific structures of each device are as follows:

[0052] Combination Figure 2 The temperature furnace 2 includes an introduction area, a buffer area and a heating area which are arranged in sequence. The introduction area and the buffer area are separated by a partition 21 which can be raised and lowered. A heat preservation plate 22 which can be raised and lowered is installed between the buffer area and the heating area and at the tail of the heating area. The lifting and lowering of the partition 21 and the heat preservation plate 22 can be realized by a driving structure with a linear output such as a lifting cylinder and a lifting motor. A heating resistance wire 24 and a temperature detector 23 are arranged in the heating area. The temperature detector 23 is used to test the temperature in the heating area. The temperature detector 23 is connected to the control system 8 so as to control the temperature of the grinding balls to be quenched.

[0053] Combination Figure 3 and Figure 4The liquid quenching device 3 includes a cooling tank 31 and a plurality of screw propellers 32 installed in the cooling tank 31. In this embodiment, three screw propellers 32 of the liquid quenching device 3 are taken as an example. Among the three screw propellers 32, the screw propeller 32 located in the middle is tilted, and the end tilted upward is the output end of the screw propeller 32. The screw propellers 32 on both sides are horizontally arranged, and the angle between the tilted screw propeller 32 and the horizontal screw propeller 32 is 3°-5°; each screw propeller 32 is equipped with a servo motor, and the corresponding screw propeller 32 is driven to rotate by the servo motor. The space between the horizontal screw propeller 32 and the tilted screw propeller 32 forms a transmission channel 33 to clamp the grinding balls for advancement, and the grinding balls generate self-rotation during the advancement process. In this embodiment, in order to enable the grinding balls to rotate and be clamped and pushed, the three screw propellers 32 can be arranged so that the blade rotation direction and the main shaft rotation direction of the horizontal screw propellers 32 on both sides are opposite, and the middle inclined screw propeller 32 has either the opposite blade rotation direction or the opposite main shaft rotation direction compared to the horizontal screw propellers 32 on the sides.

[0054] In addition, a water supply pipe 34 is installed above the screw propeller 32 of the liquid quenching device 3, and a sprayer is installed on the water supply pipe 34, and the water sprayed by the sprayer is directly facing the horizontal screw propeller 32. The cooling medium of the water supply pipe 34 comes from the circulating cooling purification pool 7.

[0055] The blades of the inclined screw propeller 32 in the liquid quenching device 3 are staggered with the blades of the adjacent horizontal screw propeller 32. And the distance between the horizontal screw propeller 32 and the inclined screw propeller 32 in the liquid quenching device 3 can be adjusted. Specifically, the horizontal screw propeller 32 can be close to or away from the inclined screw propeller 32, for example, a linear module is installed on the cooling tank 31, and the horizontal screw propeller 32 is driven to move by the linear module. A water outlet is opened in the cooling tank 31 to facilitate the discharge of the cooling medium, and a water outlet pipe 35 is installed on the water outlet.

[0056] Combination Figure 5 and Figure 6 The air quenching device 4 includes at least two parallel screw propellers 32. All the screw propellers 32 of the air quenching device 4 rotate in the same direction and the blades rotate in opposite directions. The screw propellers 32 of the air quenching device 4 are arranged obliquely, and the space between adjacent screw propellers 32 forms a propulsion channel 41 for the grinding balls. In this embodiment, the air quenching device 4 is provided with two screw propellers 32, and the two screw propellers 32 are synchronously rotated by the same servo motor and relying on a belt.

[0057] The difference between the mist quenching device 5 and the liquid quenching device 3 is that the water supply pipe 34 is provided with an atomizer instead of a sprinkler, and the atomizer sprays a mist-like cooling medium toward the grinding balls.

[0058] The output ends of the liquid quenching device 3, the air quenching device 4 and the mist quenching device 5 are all equipped with temperature acquisition modules, which are used to acquire the grinding ball temperature after each quenching device (i.e., the liquid quenching device 3, the air quenching device 4 and the mist quenching device 5) is completed. Specifically, a temperature acquisition module is correspondingly installed at the end of each transmission channel 33 and the propulsion channel 41. All temperature acquisition modules are connected to the control system 8, and the control system 8 can control the speed of the corresponding screw propeller 32 when the real-time grinding ball temperature acquired by the temperature acquisition module deviates from the system preset grinding ball temperature (i.e., by controlling the servo motor on the corresponding quenching device to control the speed of the screw propeller 32 on the corresponding quenching device). In this embodiment, the temperature acquisition module can use a temperature sensor.

[0059] The output ends of the temperature furnace 2, the liquid quenching device 3, the air quenching device 4 and the mist quenching device 5 are all fixedly mounted with inclined guide grooves 9. The arrangement of the guide grooves 9 facilitates the delivery of the grinding balls to the next device.

[0060] Combination Figure 1 The circulating cooling purification pool 7 includes a plurality of water supply areas 71 and return water areas 72. The water supply area 71 is connected to the water supply pipe 34 of the liquid quenching device 3 and the water supply pipe 34 of the mist quenching device 5. The return water area 72 is used to recover the cooling medium that has been heated in each cooling tank 31. The cooling medium used by the front liquid quenching device 3 can enter the water supply area 71 used in conjunction with the next liquid quenching device 3 after filtering after entering the return water area 72. The cooling medium used by the last-stage liquid quenching device 3 can be used for the atomizer of the mist quenching device 5 after filtering; each water supply area 71 is provided with a temperature sensor, a cooler and a heater, and the temperature sensor, the cooler and the heater are all connected to the control system 8. The temperature sensor is used to collect the water temperature of the corresponding water supply area 71. The control system 8 can control the start and stop of the cooler or heater when the real-time water temperature collected by the temperature sensor deviates from the system preset water temperature. In this embodiment, the number of water supply areas 71 is 3, and the number of return water areas 72 is also 3. The water supply areas 71 and return water areas 72 used for the same quenching device are isolated from each other, and the adjacent return water areas 72 and water supply areas 71 used for different quenching devices are separated by a filter 73. After the cooling medium used by the mist quenching device 5 enters the corresponding return water area 72, it passes through the filter 73 and is sent to the water supply area 71 corresponding to the first-level liquid quenching device 3.

[0061] Combination Figure 7The vibration device includes a driver 62, a spring 63, a vibrating screen 6 and a compressed gas injector arranged above the vibrating screen 6, the nozzle of the compressed gas injector faces the vibrating screen 6, the spring 63 is arranged obliquely, and the top of the spring 63 is fixedly connected to the vibrating screen 6. The driver 62 is used to compress the spring 63, the vibrating screen 6 is arranged obliquely, the vibrating screen 6 is inclined downwardly and close to the output end of the mist quenching device 5, and the spring 63 is inclined upwardly and toward the inclined upward end of the vibrating screen 6. The vibrating screen 6 is provided with a plurality of sieve holes to facilitate the screening of the surface oxide scale and other adhesives on the grinding balls. In this embodiment, the compressed air injector includes a plurality of injection pipes 64, each of which is provided with a plurality of injection holes facing the vibrating screen 6, and the injection holes can spray out high-pressure compressed gas.

[0062] The production process of the forged grinding ball liquid-air intermittent quenching production line based on the Internet of Things includes the following steps:

[0063] S1, debugging equipment and forging heating: according to the composition and specifications of the grinding balls and calculated by jmatpro software, the CCT and TTT cooling curves are obtained, and the cooling process route of the grinding ball quenching process is formulated according to the cooling curve. The cooling process route reflects the grinding ball temperature after different quenching stages. The control system 8 can call the cooling process route and control the grinding ball quenching process in real time according to the cooling process route.

[0064] The forged grinding balls are placed into the heat transfer zone of the temperature furnace 2 by the industrial robot 1. The grinding balls enter the buffer zone for standby after passing through the partition 21 between the heat transfer zone and the buffer zone. After the grinding balls in the heating zone have completed the heating for the set time, the insulation plate 22 rises, and the grinding balls fall from the heating zone into the first liquid quenching device 3; and the grinding balls in the buffer zone enter the heating zone for heating through the partition 21 between the buffer zone and the heating zone. S2, liquid quenching: the grinding ball falls into the inclined lower end of the inclined spiral propeller 32 in the cooling tank 31, and the horizontal spiral propeller 32 of the liquid quenching device 3 and the inclined spiral propeller 32 clamp the grinding ball and propel it obliquely upward, and the grinding ball rotates during the propulsion process; during the propulsion process of the grinding ball, the sprayer located above the cooling tank 31 continuously sprays cooling medium to the horizontal spiral propeller 32; during the continuous self-rotation and lifting process of the grinding ball, the grinding ball gradually exposes the cooling medium, and in this process, the grinding ball undergoes three stages: pure liquid quenching stage, liquid-air quenching coexistence stage and pure air quenching, so that the surface temperature of the grinding ball gradually recovers, and the internal and external temperature and structure are uniformed; in this process, the temperature acquisition module at the output end of the liquid quenching device 3 collects the temperature of the grinding ball after the liquid quenching is completed and transmits it to the control system 8, and the control system 8 controls the speed of the spiral propeller 32 of the liquid quenching device 3 after the grinding ball temperature after the liquid quenching is deviated from the corresponding preset temperature on the cooling process route. If the real-time grinding ball temperature is too high, the corresponding speed of the screw propeller 32 is lowered to increase the quenching time. If the real-time grinding ball temperature is too low, the corresponding speed of the screw propeller 32 is increased to reduce the quenching time.

[0065] S3, air quenching: After the liquid quenching is completed, the ball enters the air quenching device 4 for air quenching. The grinding balls are lifted and pushed by two adjacent screw propellers 32 on the air quenching device 4 during air quenching. During the air quenching process, the grinding balls rotate. The temperature of the grinding balls after the air quenching is collected by the temperature acquisition module installed at the output end of the air quenching device 4 and transmitted to the control system 8. The control system 8 controls the speed of the screw propeller 32 of the air quenching device 4 after the grinding ball temperature after the air quenching deviates from the corresponding preset temperature on the cooling process route. If the real-time grinding ball temperature is too high, the speed of the corresponding screw propeller 32 is reduced to increase the quenching time. If the real-time grinding ball temperature is too low, the speed of the corresponding screw propeller 32 is increased to reduce the quenching time.

[0066] The number of liquid quenching and air quenching is set accordingly according to the cooling process route, and the liquid quenching and air quenching are set alternately; in this embodiment, the number of liquid quenching and air quenching are both two levels. In actual use, the number of liquid quenching and air quenching is specifically designed according to the cooling process route, and the corresponding production line only needs to increase or decrease the liquid quenching device 3 and the air quenching device 4.

[0067] S4, mist quenching: after the last air quenching is completed, the grinding balls are mist quenched by the mist quenching device 5. During the mist quenching, the grinding balls are still pushed upward during the self-rotation process, so that the grinding balls undergo not only the pure liquid quenching stage, the liquid-air quenching coexistence stage and the pure air quenching stage, but also the atomizer makes the grinding balls completely not contact with the cooling medium in the cooling tank 31, and then the grinding balls are sprayed. The atomizer sprays the cooling medium in a mist form, so that the cooling medium attached to the surface of the grinding balls does not produce droplets and is uniformly cooled until the grinding balls are slowly cooled to room temperature; the grinding ball temperature after the mist quenching is completed is collected by the temperature acquisition module and transmitted to the control system 8. The control system 8 controls the speed of the screw propeller 32 of the mist quenching device 5 after the grinding ball temperature after the mist quenching is deviated from the corresponding preset temperature on the cooling process route. If the real-time grinding ball temperature is too high, the speed of the corresponding screw propeller 32 is reduced to increase the quenching time. If the real-time grinding ball temperature is too low, the speed of the corresponding screw propeller 32 is increased to reduce the quenching time.

[0068] S5, after quenching, the oxide scale and other adhesives on the surface of the grinding balls are removed by the vibration screen 6 in combination with the compressed gas ejector. After that, the grinding balls are sent away by the packaging conveyor belt 10 for subsequent packaging.

[0069] This embodiment realizes the whole process control of the quenching process of forged grinding balls through the control system 8, and the temperature of each stage of the grinding ball production process can be recorded, which is convenient for tracing the production of grinding balls and realizing the intelligent upgrading of enterprise grinding ball production. In addition, this embodiment uses the control system 8 and temperature collection, so that the temperature of the entire process of liquid-air intermittent quenching of forged grinding balls is monitored in real time through the Internet of Things, and can be timely feedback and regulated through the control system 8 to ensure the accuracy of the quenching time of liquid quenching, air quenching, and mist quenching and the temperature of the grinding balls after quenching. In addition, in the switching process of liquid quenching and air quenching, the grinding balls undergo three stages: pure liquid quenching stage, liquid-air quenching coexistence stage, and pure air quenching, so that the surface temperature of the grinding balls gradually rises, achieving the uniformity of the temperature and structure inside and outside the grinding balls, avoiding the rapid cooling and heating transformation of the grinding balls caused by the direct pure air quenching after the pure liquid quenching, ensuring the quality of the grinding balls quenching and the consistency of the product quality after the grinding balls quenching, and improving the production efficiency of the grinding balls.

[0070] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A liquid-air intermittent quenching production line for forged grinding balls based on the Internet of Things, comprising at least two liquid quenching devices and at least two air quenching devices, wherein the liquid quenching devices and the air quenching devices are arranged alternately, characterized in that: Each liquid quenching device and air quenching device includes a screw propeller and a temperature acquisition module, the temperature acquisition module is used to collect the grinding ball temperature at the output end of the corresponding liquid quenching device or air quenching device, and also includes a control system, all temperature acquisition modules are connected to the control system, and the control system can control the speed of the screw propeller when the real-time grinding ball temperature collected by the temperature acquisition module deviates from the system preset grinding ball temperature; The liquid quenching device also includes a cooling tank. The liquid quenching device has a plurality of spiral propellers. Some of the plurality of spiral propellers of the liquid quenching device are arranged obliquely in the cooling tank, and the remaining spiral propellers are arranged horizontally in the cooling tank. The horizontally arranged spiral propellers are located on both sides of the inclined spiral propellers. The grinding balls are sandwiched and propelled by the adjacent horizontal spiral propellers and the inclined spiral propellers, and the grinding balls rotate during the propelling process.

2. According to the Internet of Things-based forged grinding ball liquid-air intermittent quenching production line according to claim 1, it is characterized by: The liquid quenching device also includes a sprayer arranged above the screw propeller, and a water outlet is provided in the cooling tank for facilitating the discharge of the cooling medium.

3. The forged grinding ball liquid-air intermittent quenching production line based on the Internet of Things according to claim 1 is characterized by: The distance between the horizontal screw propeller and the inclined screw propeller in the liquid quenching device can be adjusted.

4. The forged grinding ball liquid-air intermittent quenching production line based on the Internet of Things according to claim 3 is characterized by: The blades of the inclined screw propeller in the liquid quenching device are staggered with the blades of the adjacent horizontal screw propeller.

5. The forged grinding ball liquid-air intermittent quenching production line based on the Internet of Things according to claim 1 is characterized by: The air quenching device comprises at least two parallel screw propellers, all the screw propellers of the air quenching device rotate in the same direction but with opposite blade rotation directions, and the screw propellers of the air quenching device are arranged obliquely.

6. The forged grinding ball liquid-air intermittent quenching production line based on the Internet of Things according to claim 1 is characterized by: It also includes a mist quenching device located at the output end of the last air quenching device. The mist quenching device has the same structure as the liquid quenching device. The mist quenching device is provided with an atomizer above the screw propeller on the basis of the liquid quenching device. The atomizer sprays mist cooling medium toward the grinding balls.

7. The forged grinding ball liquid-air intermittent quenching production line based on the Internet of Things according to claim 6 is characterized by: It also includes a circulating cooling purification pool, which includes multiple water supply areas and return water areas. The water supply area is used to provide new cooling medium to the cooling tank, and the return water area is used to recover the cooling medium that has been heated in the cooling tank. The cooling medium used by the front liquid quenching device can enter the water supply area used in conjunction with the next liquid quenching device after filtration after entering the return water area. The water supply area is equipped with a temperature sensor, a cooler and a heater. The temperature sensor, the cooler and the heater are all connected to the control system. The temperature sensor is used to collect the water temperature of the corresponding water supply area. The control system can control the start and stop of the cooler or heater when the real-time water temperature collected by the temperature sensor deviates from the system preset water temperature.

8. The forged grinding ball liquid-air intermittent quenching production line based on the Internet of Things according to claim 6 is characterized by: It also includes a vibrating device located at the output end of the mist quenching device. The vibrating device includes a vibrating screen and a compressed gas injector arranged above the vibrating screen. The nozzle of the compressed gas injector faces the vibrating screen.

9. A production process for liquid-air intermittent quenching of forged grinding balls based on the Internet of Things, characterized in that: The steps include: S1, debugging equipment: obtaining the cooling process route of the grinding ball quenching process according to the grinding ball composition and specifications, the cooling process route reflects the grinding ball temperature after different quenching stages, and the control system can call the cooling process route and control the grinding ball quenching process in real time according to the cooling process route; S2, liquid quenching: the grinding balls are pushed by a liquid quenching device with multiple screw propellers, some of the multiple screw propellers of the liquid quenching device are arranged obliquely in the cooling tank of the liquid quenching device, and the remaining screw propellers are arranged horizontally in the cooling tank, and the horizontally arranged screw propellers are located on both sides of the inclined screw propellers. The grinding balls are sandwiched and pushed by the adjacent horizontal screw propellers and the inclined screw propellers, and the grinding balls rotate during the pushing process; the temperature of the grinding balls after the liquid quenching is completed is collected and transmitted to the control system, and the control system controls the speed of the screw propeller of the liquid quenching device after the temperature of the grinding balls after the liquid quenching is deviated from the corresponding preset temperature on the cooling process route; S3, air quenching: after the liquid quenching is completed, the ball enters the air quenching device for air quenching. The air quenching device includes at least two parallel screw propellers. The grinding balls for air quenching are lifted and pushed by two adjacent screw propellers on the air quenching device. During the air quenching process, the grinding balls rotate. The temperature of the grinding balls after the air quenching is collected and transmitted to the control system. The control system controls the speed of the screw propeller of the air quenching device after the grinding ball temperature after the air quenching deviates from the corresponding preset temperature on the cooling process route. The number of liquid quenching and air quenching is set accordingly according to the cooling process route, and liquid quenching and air quenching are set alternately. S4, mist quenching: after the last air quenching is completed, the grinding balls are mist quenched by a mist quenching device. The structure of the mist quenching device is the same as that of the liquid quenching device. The temperature of the cooling medium used by the mist quenching device is higher than the temperature of the cooling medium during the last air quenching. During the mist quenching, an atomizer is installed above the screw propeller of the mist quenching device, and the atomizer sprays the cooling medium in a mist form toward the grinding balls. The temperature of the grinding balls after the mist quenching is collected and transmitted to the control system. The control system controls the speed of the screw propeller of the mist quenching device after the grinding ball temperature after the mist quenching deviates from the corresponding preset temperature on the cooling process route. S5, after quenching, remove the oxide scale and other adhesives on the surface of the grinding ball.

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