Steel shot heat treatment apparatus and quenching process thereof

Abstract

The application provides a steel ball heat treatment equipment and a quenching process thereof, and particularly relates to a steel ball continuous heat treatment device. The device comprises a rust removal module, a heating module, a quenching module, a post-processing module and a cleaning module. The rust removal module, the quenching module, the post-processing module and the cleaning module are connected through pipelines. The heating module is located between the rust removal module and the quenching module and is wrapped on the outer wall of the pipeline. The steel ball is pre-cleaned and pre-heated through twice heating, so that the energy consumption in the heat treatment process is reduced, energy is saved and the environment is protected. Compared with a traditional production line, the energy saving rate is 35%. Through high-frequency induction rapid heating channels, eddy current quenching systems and electromagnetic eddy current drying towers and other high-efficiency energy-saving components, the energy consumption is reduced, and carbon emissions are reduced.

Description

TECHNICAL FIELD

[0001] The application provides a steel ball heat treatment equipment and a quenching process thereof, and particularly relates to a continuous steel ball heat treatment device. BACKGROUND

[0002] The steel ball heat treatment for sandblasting is a key process link in the surface treatment industry, and its quality directly affects the sandblasting efficiency and surface treatment effect. The traditional heat treatment process generally has the following technical bottlenecks: 1. The production line adopts a decentralized layout, and the quenching, tempering and other processes need to transfer the materials multiple times, and the equipment occupies an area of 300-500 square meters; 2. The thermal efficiency of the gas heating furnace is less than 40%, and the energy consumption per ton of product is as high as 120-150 kW·h; 3. The process connection relies on manual transfer, and the average processing period is as long as 6-8 hours; 4. The temperature fluctuation is more than ±25℃, resulting in a hardness difference of HRC3-5 of the steel ball, and the qualified rate is only 75-82%. The industry urgently needs to solve the problems of energy consumption and quality control through process innovation; in the prior art, the induction heating technology disclosed in CN112195334A realizes rapid heating of 0.8-1.2℃ / s in the treatment of steel strips, but the annular coil structure has the problem of uneven heating when the steel balls are processed in batches, and the core-surface temperature difference of the steel balls with a diameter of 2-3mm is 50-80℃; the double-frequency alternating heating mode (switching between medium frequency 5-10kHz and high frequency 50-100kHz) used in this patent improves the uniformity of the steel strip structure, but when applied to spherical workpieces, electromagnetic field interference is easily caused, resulting in 15-20% of overheated or underheated defective products; the full-continuous production system proposed in CN112143877A realizes a process automation rate of 98% in the treatment of plates, but its linear layout (the length is more than 150 meters) faces two challenges in the treatment of steel balls: one is the positioning deviation caused by the rolling of the balls, which affects the quenching uniformity, and the other is the surface oxidation thickening (up to 20-30μm) caused by continuous transmission; the laser temperature measurement accuracy ±10℃ of this system is better than that of the traditional equipment, but it cannot meet the process requirement of ±5℃ of the steel balls, resulting in a fluctuation of 12-15% in the martensite transformation rate; the current steel ball heat treatment technology has the following significant defects: first, the production line layout does not consider the flowability characteristics of the balls, and 8-12% of mechanical damage is caused in the material transmission process; second, the heat treatment energy consumption accounts for more than 40% of the production cost, and the waste heat recovery rate is less than 15%; third, the automatic control system lacks three-dimensional temperature field monitoring, and the control deviation of the key process parameters (austenitizing time, cooling rate, etc.) exceeds 20% of the process requirement; fourth, the traditional roller bottom furnace has air flow dead angles, resulting in 3-5% of the steel balls having quenching soft spots (hardness lower than HRC50), which seriously affects the sandblasting life (reduces by 30-40%). SUMMARY

[0003] The application provides a steel ball heat treatment equipment and a quenching process thereof.

[0004] A steel shot heat treatment equipment, comprising: a rust removal module, a heating module, a quenching module, a post-processing module, a cleaning module; the rust removal module, the quenching module, the post-processing module and the cleaning module are communicated through pipelines, the heating module is located between the rust removal module and the quenching module, and is correspondingly wrapped on the outer sidewall of the pipeline;

[0005] The rust removal module adopts a spiral lifting structure to transport and lift the steel shots, and the sidewall is provided with a vibration structure to vibrate and remove rust from the steel shots;

[0006] The heating module adopts a high-frequency heating coil, the steel shots pass through the coil in sequence,

[0007] The quenching module is mainly a bath to quickly cool the quenching medium;

[0008] The steel shots are subjected to surface rust removal, heating, quenching, post-processing and cleaning through the rust removal module to realize heat treatment operation.

[0009] Preferably, the heating module is provided with two-stage heating, the first stage heats the steel shots to 500 DEG C ± 10 DEG C and keeps warm for 10 min, and the second stage continuously heats the steel shots to 845 DEG C ± 5 DEG C and keeps warm for 25 min in a controllable carbon potential atmosphere; the post-processing module is used for separating and peeling off the oxide skin formed on the surface of the steel shots after quenching, and the post-processing module comprises a material transportation structure, a vibration structure, a gas suction structure for oxide skin adsorption, and a ventilation system.

[0010] Preferably, the rust removal module is a vibration rust removal module, comprising a base, a material falling pipe vertically suspended at the center of the base, a hopper provided at the top of the material falling pipe, a spiral lifting structure provided on the base, the spiral lifting structure being located outside the material falling pipe, the steel shots being lifted by the spiral lifting structure, an electric drive rotary disc being embedded in the base, sandpaper being attached to the surface of the rotary disc for polishing the surface of the steel shots, a guide-out structure being provided at the upper end of the spiral lifting structure, the guide-out structure being communicated with the heating module and forming a continuous conveying of the steel shots.

[0011] Preferably, the guide-out end of the heating module and the guide-in end of the quenching module are communicated, the quenching module is provided with flowing quenching medium, the bottom of the quenching module is provided with a discharge port, and the discharge port is communicated with the post-processing module for separating the oxide skin.

[0012] Preferably, the quenching module comprises a lower tank body, the lower tank body is mainly tubular, comprising a large-end flat tube, a small-end circular tube and a variable-diameter tube communicating the large end and the small end, the large end corresponds to the heating module, a quenching tank is embedded in the large end of the lower tank body and is sealingly arranged between the lower tank body, and the quenching tank and the lower tank body directly reserve two channels for the flow of the steel shots.

[0013] The quenching tank is provided with a lifting support plate which can be lifted into the quenching tank and the edge thereof is in sliding fit with the inner wall of the quenching tank;

[0014] The side wall of the quenching tank is provided with a quenching medium pipe which penetrates the lower tank body, and the quenching medium pipe is provided with two groups which are used for the inlet and outlet of the quenching medium respectively;

[0015] The outer side of the quenching tank is provided with an outer bath tank, the edge of the outer bath tank is in sealing fit with the inner wall of the lower tank body, and a cavity is formed on the outer side wall of the quenching tank, the outer bath tank is provided with two groups of guide plates which correspond to the quenching tank, and the outer bath tank is provided with two groups of water bath pipes, the water bath pipes correspond to the guide plates and penetrate the lower tank body, and the water bath pipes are used for the circulation of the cooling medium.

[0016] Preferably, the bottom of the outer bath tank is provided with a lifting lead screw which penetrates the quenching tank and is connected with the bottom of the lifting support plate, and the inner side wall of the quenching tank is provided with a flow distribution cover which is correspondingly covered on the quenching medium pipe to distribute and diffuse the flow;

[0017] Preferably, the inner side wall of the variable diameter pipe of the lower tank body is provided with a buffer pad to buffer the falling of the steel shots.

[0018] The corresponding heat treatment process of the equipment includes the following steps:

[0019] Surface pretreatment: the steel shots are sent into the spiral vibration rust removal module, and are treated for 90-120 seconds under the condition that the vibration frequency is 20-25 Hz and the amplitude is 3-5 mm, the surface rust is removed by the mixed medium of nylon brush and sand, and the sand is recycled by using the electromagnetic separator, and the recycling rate is ≥99.5%;

[0020] Gradient heating:

[0021] a. preheating section: the steel shots are heated to 480-520℃ by using a longitudinal induction coil (frequency 10 kHz, power 80-120 kW), and are kept for 8-12 minutes, and the carbon potential Cp is controlled to be 0.35-0.45%;

[0022] b. austenitizing section: the steel shots are continuously heated to 840-850℃ by using a transverse induction coil (frequency 1-2 kHz, power 180-220 kW), and are kept for 20-30 minutes, and the austenitizing is completed under the protection of CO / CO2=1.1-1.3, and the austenitizing rate is ≥97%;

[0023] Rapid quenching: the heated steel shots are sent into the vortex quenching system, and are rapidly cooled to 280±10℃ at a cooling rate of ≥150℃ / s in a polymer solution with a concentration of 12±0.5%, and then continue to cool to 50-70℃;

[0024] Scale stripping: shot blasting of quenched steel shot by centrifugal sand blasting unit, glass bead diameter 0.3-0.7mm, jet pressure 0.5-0.7MPa, coverage rate ≥200%, and scale debris is filtered by negative pressure recovery system, residual rate ≤0.03%;

[0025] Vortex drying: under the condition of alternating magnetic field strength 2500-3500A / m, frequency 45-55Hz, residual moisture on the surface of the steel shot is evaporated to ≤0.01% (mass fraction), and the drying time is 40-60 seconds.

[0026] In step 2: the heating rates of the preheating section and the austenitizing section are 50-60℃ / s and 80-100℃ / s respectively, the oxygen content is ≤50ppm during the heating process, and the steel shot surface temperature difference ΔT is ≤15℃ monitored by a 32-point infrared thermal imager array in real time;

[0027] In step 3: the viscosity of the polymer solution is 28-38cP (40℃), the medium flow rate in the quenching tank is 700-900L / min, the medium temperature fluctuation is controlled to ≤±2℃ by a plate heat exchanger, and the quenching tank lifting apron is raised and lowered at a speed of 0.5-2mm / s to adjust the steel shot residence time;

[0028] In step 4: the glass bead projection angle of the shot blasting treatment is 30-60°, the honeycomb guide plate aperture is 3-8mm, the negative pressure system air volume is 1000-1500m 3 / h, and a 0.3-0.5μm precision filter is configured;

[0029] In step 5: the alternating magnetic field is generated by an electromagnetic vortex drying tower, the steel shot completes drying in a 5-8 meter slope (slope 8-12°), and the magnetic field power is adjusted in real time by an infrared temperature measuring device (accuracy ±1℃) to ensure that the steel shot surface temperature is maintained at 150-180℃.

[0030] Preferably, it also includes: continuously conveying the steel shot on a magnetic levitation conveyor belt (gap 0.8-1.2mm, temperature resistance ≥1200℃), the conveying speed is adjustable at 0.5-5m / min, and the single section difference between modules is ≤50mm and the cumulative total difference is ≤200mm controlled by a laser range finder dynamic control module;

[0031] When the heating section temperature is detected to be >920℃ for 2 seconds, the emergency water cooling system (flow rate ≥200L / min) is automatically triggered; when the quenching medium conductivity is >200μS / cm, the standby medium tank is switched and the replacement is completed within 3 seconds;

[0032] The final steel shot performance meets:

[0033] - surface hardness 62-64 HRC, core hardness 55-57 HRC (ASTM E384 standard);

[0034] - ovality < 0.01 mm (DIN 5401 standard);

[0035] - residual compressive stress 450-550 MPa (XRD method);

[0036] - no red rust after 72 hours of salt spray test (ASTM B117 standard).

[0037] The steel ball heat treatment equipment and quenching process of the application are energy-saving and environment-friendly, and save 35% energy compared with traditional production lines. The high-frequency induction rapid heating channel, eddy current quenching system and electromagnetic eddy current drying tower and other high-efficiency energy-saving components reduce energy consumption and carbon emissions. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is a process schematic diagram of the steel ball heat treatment equipment of the application.

[0039] Figure 2 It is a perspective view of the quenching module of the application.

[0040] Figure 3 It is a perspective view of the quenching module of the application.

[0041] Figure 4 It is a structural schematic diagram of the quenching module of the application.

[0042] Figure 5 It is a process flow chart of the heat treatment process of the application.

[0043] Figure 6 It is a schematic diagram of the heating step of the application.

[0044] Figure 7 It is a structural schematic diagram of the quenching process of the application.

[0045] Figure 8 It is a structural schematic diagram of the detection process of the application.

[0046] IN THE DRAWINGS:

[0047] 1, lower tank body; 2, lifting support plate; 3, quenching tank; 4, deflector; 5, outer bath tank; 6, lifting screw; 7, quenching medium pipe; 8, flow divider cover; 9, buffer pad; 10, water bath pipe. DETAILED DESCRIPTION

[0048] The application will be further described below in conjunction with the drawings.

[0049] Example 1:

[0050] A steel shot heat treatment equipment, comprising: a rust removal module, a heating module, a quenching module, a post-processing module, a cleaning module; the rust removal module, the quenching module, the post-processing module and the cleaning module are communicated through pipelines, the heating module is located between the rust removal module and the quenching module, and is correspondingly wrapped on the outer wall of the pipeline;

[0051] The rust removal module adopts a spiral lifting structure (lifting angle 30-45°) matched with a vibration structure (frequency 20-25 Hz, amplitude 3-5 mm;

[0052] The heating module adopts a high-frequency heating coil array (working frequency 10-20 kHz), and the steel shot continuously passes along the central axis of the coil;

[0053] The quenching module is mainly in the form of a bath structure, and a flow quenching medium (flow rate 700-900 L / min) is arranged therein;

[0054] The post-processing module integrates a vibration structure (acceleration 5-8 g), an air extraction system (negative pressure value -15~-20 kPa) and a ventilation system;

[0055] The first heating section: the steel shot is heated to 500℃±10℃, and the temperature is maintained for 10 min (longitudinal induction coil, frequency 10 kHz, power 80-120 kW); the second heating section: continuously heated to 845℃±5℃, and the temperature is maintained for 25 min (transverse induction coil, frequency 1-2 kHz, power 180-220 kW); controllable carbon potential atmosphere (CO / CO2=1.1-1.3, oxygen content≤50ppm);

[0056] The base is internally provided with an electrically-driven rotary disc (rotational speed 30-50 rpm), and the surface is attached with replaceable sandpaper (granularity 80-120 mesh); a vertical feeding pipe (diameter Φ200mm) is provided with a hopper (volume 500L) at the top; a spiral lifting structure (pitch 150mm, lifting speed 0.5-2m / min) surrounds the outer periphery of the feeding pipe; the sandpaper wear detection interval is ≥200 hours; the recovery efficiency of the electromagnetic separator is ≥99.5%;

[0057] The lower tank body 1 is in the form of a tubular structure, comprising a large-end flat pipe (cross section 400×200mm), a small-end circular pipe (Φ150mm) and a variable-diameter pipe (taper angle 15°), and a buffer pad 9 (silicone material, thickness 20mm, Shore hardness 60HA) is arranged on the inner wall of the variable-diameter pipe; the quenching tank 3 and the lifting supporting plate 2 (Z-shaped guide groove, sealing gap≤0.1mm) are connected with the lifting lead screw 6 (lead 10mm, positioning accuracy±0.05mm), and the shunt cover 8 (pore diameter Φ3mm, opening rate 40%) covers the quenching medium pipe 7 (inlet and outlet pipe diameter Φ50mm);

[0058] The outer bath 5, double guide plate 4 (inclination 45°, interval 80mm) and water bath pipe 10 (flow control precision ±5%) form turbulent cooling; and the quenching tank 3 form 5-8mm cavity;

[0059] Step 1: surface pretreatment

[0060] - vibration derusting: 20-25Hz / 3-5mm amplitude, treatment 90-120 seconds;

[0061] - sand recovery: electromagnetic separator (magnetic field strength 0.8T) is recycled;

[0062] Step 2: gradient heating

[0063] - preheating section: 480-520℃x8-12min (heating rate 50-60℃ / s);

[0064] - austenitizing section: 840-850℃x20-30min (heating rate 80-100℃ / s);

[0065] Step 3: rapid quenching

[0066] - 12±0.5% polymer solution (viscosity 28-38cP / 40℃), cooling rate≥150℃ / s;

[0067] - final cooling temperature 50-70℃ (medium temperature difference ±2℃);

[0068] Step 4: oxide skin stripping

[0069] - glass bead shot: diameter 0.3-0.7mm, pressure 0.5-0.7MPa, coverage≥200%;

[0070] - negative pressure recovery: air volume 1000-1500m³ / h, 0.3-0.5μm filter;

[0071] Step 5: vortex drying

[0072] - alternating magnetic field: 2500-3500A / m, 45-55Hz;

[0073] - ramp drying: length 5-8m, slope 8-12°, surface temperature 150-180℃ (infrared temperature measurement ±1℃);

[0074] Performance guarantee

[0075]

[0076] Example two:

[0077] The embodiment provides a steel shot heat treatment equipment, adopts a five-layer vertical compact layout (total height 3.2 m*length 2.5 m*width 1.8 m), and contains the following core modules:

[0078] Spiral vibration rust removal module: the vibration disc (diameter 500 mm, vibration frequency 20 Hz, amplitude 5 mm) is embedded with mixed media of nylon brush hair and fine sand, and the bottom electromagnetic separator (magnetic field strength 0.8 T) realizes sand recovery, the loss rate is less than or equal to 0.5%, the spiral lifting structure processing capacity is 800 kg / h, and the lifting angle is 30°.

[0079] High-frequency induction rapid heating channel: 10 groups of micro induction coils (frequency 20 kHz, power 200 kW) are arranged in the U-shaped ceramic guide rail (bending angle 120°, wall thickness 15 mm), a nitrogen protection system (purity greater than or equal to 99.99%, oxygen sensor controls O2 less than 50 ppm), the steel shot is heated to 900±15 DEG C within 10 seconds, and the heating rate is greater than or equal to 90 DEG C / s.

[0080] Eddy current quenching system: the conical quenching tank (inner diameter 600 mm / outer diameter 800 mm, material SUS316L) is driven by a high-speed eddy current generator (rotating speed 10000 rpm) to drive 12±0.5% polymer solution (viscosity 30-35 cP, 40 DEG C), the plate heat exchanger controls the medium temperature difference ±2 DEG C, and the steel shot is cooled to below 80 DEG C within 3 seconds.

[0081] Centrifugal sand blasting stripping unit: the glass bead shot blasting chamber (diameter 1000 mm, spraying pressure 0.6 MPa, glass bead diameter 0.5 mm), 304 stainless steel honeycomb guide plate (pore size 5 mm, opening rate 60%), negative pressure recovery system (filtration precision 0.3 μm, air volume 1200 m 3 / h).

[0082] Electromagnetic eddy current drying tower: alternating magnetic field generator (frequency 50 Hz, power 30 kW), ramp type drying channel (length 5 m, slope 10 DEG, surface roughness Ra≤0.8 μm), infrared temperature measuring device (accuracy ±1 DEG C, response time 0.1 s).

[0083] Conveying and supporting system: magnetic levitation conveying belt (temperature resistance 1200 DEG C, gap 0.8-1.2 mm, speed 0.5-5 m / min), cumulative drop between modules <200 mm (single section drop ≤50 mm), quick-release maintenance channel (width 600 mm, bearing capacity 300 kg / m 2 ).

[0084] The five-layer vertical layout realizes that the occupied area is 5.76 m 2 (60% less than a traditional equipment), and the magnetic levitation conveying belt is high-temperature resistant (continuous working for more than 5000 h under 1200 DEG C).

[0085] Example three:

[0086] Heating process and structure:

[0087] 1. Preheating section: longitudinal induction coil (frequency 10 kHz, power 100 kW), steel shot heating to 500±10℃, holding for 10 min, carbon potential control Cp=0.4%;

[0088] 2. Austenitizing section: transverse induction coil (frequency 1 kHz, power 200 kW), heating to 845±5℃, holding for 25 min, CO / CO2=1.2 atmosphere protection;

[0089] Two-stage heating process reduces energy consumption by 15% (compared to conventional single-stage heating), and the cooling rate of the eddy current quenching system reaches 280℃ / s (2.5 times the critical cooling rate);

[0090] Quenching module specific structure:

[0091] 1. Lower tank body assembly: large end flat tube (cross-sectional size 400×200mm) transitions to small end round tube (Φ150mm) through reducing pipe (taper angle 15°), and buffer pad (silicone material, thickness 20mm, Shore hardness 60HA).

[0092] 2. Quenching tank function unit: lifting backboard (stroke ±150mm, Z-shaped guide groove structure, sealing gap ≤0.1mm), shunt cover (pore diameter Φ3mm, opening rate 40%) uniformly distributes quenching medium, and double guide plates (inclination angle 45°, spacing 80mm) form turbulent flow with outer bath tank.

[0093] 3. Cooling control system: water bath pipe (Φ50mm, flow control accuracy ±5%), lifting lead screw (lead 10mm, accuracy IT5 level, axial stiffness 500N / μm).

[0094] Process indicators, critical cooling rate ≥150℃ / s (900℃→280℃ stage), final cooling temperature 60±5℃, and ovality change amount ≤0.008mm.

[0095] Example four:

[0096] Temperature field monitoring, 32-point infrared thermal imager array (temperature measurement range 0-1200℃, accuracy ±1℃), heating section temperature difference ΔT≤15℃, quenching medium temperature difference ±2℃; 32-point temperature field real-time feedback regulation (PID parameter self-tuning), medium concentration closed-loop control (fluctuation rate <±0.3%),

[0097] Medium management, polymer solution concentration online detection (conductivity method, accuracy ±0.1%), automatic liquid supplementing system (response time <5s, flow error ±0.5L / min);

[0098] Deformation suppression system, magnetic levitation gap laser ranging (resolution 0.01mm, sampling rate 1kHz), dynamic weighing rejection system (accuracy ±0.002g, processing speed 1200pcs / min);

[0099]

[0100] Abnormal processing mechanism

[0101]

[0102] Example five:

[0103] Process steps and parameters,

[0104] 1. Surface pretreatment, vibration rust removal (20Hz, amplitude 5mm, time 90-120s), automatic recovery rate of sand ≥99.5%;

[0105] 2. Gradient heating, preheating section: 500±10℃×10min, grain size refinement to ASTM 8-9 level, austenitizing section: 845±5℃×25min, austenitizing rate ≥98%;

[0106] 3. Rapid quenching, polymer solution cooling (20-80℃, flow rate 800L / min), martensitic transformation completed within 3 seconds (Ms point 280℃);

[0107] 4. Oxide skin stripping, glass bead impact (speed 60m / s, coverage 200%), negative pressure recovery efficiency ≥99.8%;

[0108] 5. Vortex drying, alternating magnetic field (frequency 50Hz, magnetic field strength 3000A / m), surface moisture residue ≤0.01% (mass fraction);

[0109] Process effect,

[0110] Hardness uniformity HRC±1.0,

[0111] Residual compressive stress 450-550MPa (determined by XRD method),

[0112] Salt spray test 72h without red rust (ASTM B117 standard).

[0113] The above describes the present application and its embodiments, which are not restrictive, and the drawings shown are only one of the embodiments of the present application, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired thereby, without departing from the purpose of the present application, without creative design, similar structure and embodiments to the technical solution, which should belong to the protection scope of the present application.

Claims

1. A steel shot heat treatment equipment, comprising: a rust removal module, a heating module, a quenching module, a post-processing module, and a cleaning module; characterized in that the rust removal module, the quenching module, the post-processing module, and the cleaning module are connected through pipes, the heating module is located between the rust removal module and the quenching module and is wrapped on the outer wall of the pipes; The rust removal module adopts a spiral lifting structure to transport and lift the steel shot, and the side wall is provided with a vibration structure to vibrate and remove rust from the steel shot; The heating module adopts a high-frequency heating coil, and the steel shot passes through the coil axis in sequence, The main body of the quenching module is a bath to quickly cool the quenching medium; The steel shot is subjected to surface rust removal, heating, quenching, post-processing, and cleaning through the rust removal module to realize heat treatment operation; The rust removal module is a vibration rust removal module, which comprises a base, a blanking pipe vertically suspended at the center of the base, a hopper arranged at the top of the blanking pipe, a spiral lifting structure arranged on the base, the spiral lifting structure being arranged outside the blanking pipe, the steel shot being lifted by the spiral lifting structure, an electric drive rotary disc being embedded in the base, a replaceable sandpaper being attached to the surface of the rotary disc for polishing the surface of the steel shot, a guide-out structure being arranged at the upper end of the spiral lifting structure, the guide-out structure being connected with the heating module and forming a continuous conveying of the steel shot; The guide-out end of the heating module and the guide-in end of the quenching module are connected, the quenching module is provided with a flowing quenching medium, the bottom of the quenching module is provided with a discharge port, and the discharge port is connected with the post-processing module for separating the oxide skin; The quenching module comprises a lower tank body (1), the main body of the lower tank body (1) is tubular, including a large-end flat tube, a small-end circular tube, and a variable-diameter tube connecting the large end and the small end, the large end corresponds to the heating module, a quenching tank (3) is embedded in the large end of the lower tank body (1) and is sealingly arranged between the quenching tank (3) and the lower tank body (1), the quenching tank (3) and the lower tank body (1) directly reserve two channels for the flow of the steel shot; The quenching tank (3) is provided with a lifting support plate (2) which can be lifted in the quenching tank (3) and the edge thereof is slidingly attached to the inner wall of the quenching tank (3); The side wall of the quenching tank (3) is provided with a quenching medium pipe (7) which penetrates the lower tank body (1), the quenching medium pipe (7) is provided with two groups for the inlet and outlet of the quenching medium; The outer side of the quenching tank (3) is provided with an outer bath (5), the edge of the outer bath (5) is sealingly attached to the inner wall of the lower tank body (1) and forms a cavity on the outer side wall of the quenching tank (3), the outer bath (5) is provided with two groups of guide plates (4) corresponding to the quenching tank (3), the outer bath (5) is provided with two groups of water bath pipes (10) corresponding to the guide plates (4), the water bath pipes (10) penetrate the lower tank body (1), and the water bath pipes (10) are used for the flow of the cooling medium. 2.The steel shot heat treatment equipment according to claim 1, characterized in that ​ The heating module is provided with two-stage heating, the first stage heats the steel shot to 500℃±10℃, and the second stage continuously heats the steel shot to 845℃±5℃, and the holding time is 25 minutes, and the carbon potential atmosphere is controllable; the post-processing module is used for separating and peeling the oxide skin formed on the surface of the quenched steel shot, and the post-processing module comprises a material conveying structure, a vibrating structure, a gas suction structure for oxide skin adsorption, and a ventilation system. 3.The steel shot heat treatment equipment according to claim 1, characterized in that, The outer bath tank (5) is provided with a lifting lead screw (6) at the bottom, the lifting lead screw (6) penetrates through the quenching tank (3) and is connected with the bottom of the lifting supporting plate (2), and the inner side wall of the quenching tank (3) is provided with a flow distribution cover (8) which is correspondingly covered on the quenching medium pipe (7) to realize flow distribution and diffusion. 4.The steel shot heat treatment equipment according to claim 3, characterized in that, The inner side wall of the reducing pipe of the lower tank body (1) is provided with a buffer pad (9) to buffer the falling of the steel shot. 5.A steel shot heat treatment process, the steel shot heat treatment equipment according to any one of claims 1-4, the heat treatment process comprising the following steps: (1) surface pretreatment: the steel shot is sent into the spiral vibration rust removal module, and is treated under the condition that the vibration frequency is 20-25 Hz and the amplitude is 3-5 mm for 90-120 seconds, the surface rust is removed by the mixed medium of nylon brush and sand, and the sand is recycled by using an electromagnetic separator, and the recycling rate is greater than or equal to 99.5 %; (2) gradient heating: a. preheating stage: the steel shot is heated to 480-520℃ by using a longitudinal induction coil with a frequency of 10 kHz and a power of 80-120 kW, and the holding time is 8-12 minutes, and the carbon potential Cp is controlled to be 0.35-0.45 %; b. austenitizing stage: the steel shot is continuously heated to 840-850℃ by using a transverse induction coil with a frequency of 1-2 kHz and a power of 180-220 kW, and the holding time is 20-30 minutes, and austenitizing is completed in a protective atmosphere with CO / CO2=1.1-1.3, and the austenitizing rate is greater than or equal to 97 %; (3) rapid quenching: the heated steel shot is sent into a vortex quenching system, and is rapidly cooled to 280±10℃ at a cooling rate of greater than or equal to 150℃ / s in a polymer solution with a concentration of 12±0.5 %, and then continues to be cooled to 50-70℃; (4) oxide skin peeling: the quenched steel shot is treated by a centrifugal sandblasting unit, the glass bead diameter is 0.3-0.7 mm, the spraying pressure is 0.5-0.7 MPa, the coverage rate is greater than or equal to 200 %, and a negative pressure recovery system is used to filter the oxide skin debris, and the residual rate is less than or equal to 0.03 %; (5) vortex drying: under the condition that the alternating magnetic field strength is 2500-3500 A / m and the frequency is 45-55 Hz, the mass fraction of the residual moisture on the surface of the steel shot is evaporated to less than or equal to 0.01 %, and the drying time is 40-60 seconds. 6.The heat treatment process according to claim 5, characterized in that, In step (2), the heating rate of the preheating section and the austenitizing section is 50-60℃ / s and 80-100℃ / s respectively, the oxygen content is ≤50ppm during the heating process, and the surface temperature difference ΔT of the steel shot is monitored by a 32-point infrared thermal imager array in real time, and the surface temperature difference ΔT of the steel shot is ≤15℃; In step (3), the viscosity of the polymer solution is 28-38cP at 40℃, the medium flow rate in the quenching tank is 700-900L / min, the temperature fluctuation of the medium is controlled by the plate heat exchanger to be ≤±2℃, and the quenching tank lifting plate is lifted at a speed of 0.5-2mm / s to adjust the residence time of the steel shot; In step (4), the shot blasting glass bead projection angle is 30-60°, the honeycomb guide plate aperture is 3-8mm, the negative pressure system air volume is 1000-1500m 3 / h, and a 0.3-0.5μm precision filter is configured. In step (5), the alternating magnetic field is generated by an electromagnetic eddy current drying tower, the steel shot is dried in a slope of 8-12° and a slope of 5-8 meters, and the magnetic field power is adjusted in real time by an infrared temperature measuring device with an accuracy of ±1℃ to ensure that the surface temperature of the steel shot is maintained at 150-180℃.

7. The heat treatment process according to claim 6, further comprising: continuously conveying the steel shot on a magnetic levitation conveying belt with a gap of 0.8-1.2mm and a temperature resistance of ≥1200℃, the conveying speed is adjustable at 0.5-5m / min, and the single section difference between the modules is controlled by a laser range finder dynamic control module to be ≤50mm, and the cumulative total difference is ≤200mm; when the heating section temperature is detected to be >920℃ for 2 seconds, the emergency water cooling system is automatically triggered, and the flow rate is ≥200L / min; when the quenching medium electrical conductivity is >200μS / cm, the standby medium tank is switched and the replacement is completed within 3 seconds; the final steel shot performance meets: the surface hardness is 62-64HRC under the ASTM E384 standard, the core hardness is 55-57HRC, the ovality is ≤0.01mm under the DIN 5401 standard, the residual compressive stress is 450-550MPa under the XRD method, and there is no red rust after the salt spray test for 72 hours under the ASTM B117 standard. ​

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