Tempering furnace device for automobile ball pin production

Abstract

The tempering furnace device for automobile ball pin production comprises a furnace body, a rotating assembly is arranged at the top end of the furnace body, mounting assemblies are arranged on the circumferential side face of a rotating shaft of the rotating assembly at equal intervals, rotating clamping mechanisms are arranged in the mounting assemblies, an air supply pipe is arranged on one side of the top end of the furnace body, and a sand blasting conveying pipe is arranged on one side of the air supply pipe. A sand blasting opening matched with the rotary clamping mechanism is obliquely formed in the lower portion of the sand blasting conveying pipe. A collecting mechanism is arranged at the bottom end of the furnace body, and a filtering assembly is arranged in the collecting mechanism. Integrated continuous operation of tempering and sand blasting cleaning is achieved, after the ball pins are subjected to heat treatment in the tempering furnace, cooling transfer is not needed, sand blasting cleaning is directly conducted in the furnace through waste heat, transfer time consumed between procedures is saved, all-directional dead-corner-free cleaning of a single set of ball pins is achieved, restarting revolution can be conducted for secondary tempering after cleaning is completed, and the production efficiency is improved. And secondary oxidation is avoided, the cleaning precision and the tempering quality are both considered, and the metallographic structure stability is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of automotive ball joint processing technology, specifically, it relates to a tempering furnace device for automotive ball joint production. Background Technology

[0002] The industrialization of automobiles has reached a high level. Automobiles are composed of many parts, and ball joints are one of them. Ball joints are key components that ensure the stability of automobile handling, smoothness, comfort, safety, and correct and accurate driving. They are also known as ball hinges or ball joints. As core components of the steering and suspension systems, automobile ball joints need to be tempered to improve their strength and toughness. After tempering, an oxide layer is easily formed on the surface, which needs to be cleaned in time to ensure the accuracy of subsequent assembly and service life.

[0003] In existing processing techniques, tempering and oxide layer removal are mostly separate processes, which present the following technical problems. 1. Inefficiency caused by process fragmentation: After the ball pins are heat-treated in the tempering furnace, they need to be cooled to room temperature before being transferred to a special sandblasting equipment for surface cleaning. The time spent on inter-process transfer accounts for 20%-30% of the total production time, and additional clamping and transfer tooling is required. The production process is cumbersome and cannot achieve continuous operation.

[0004] 2. Conflict between surface treatment effect and workpiece performance: Traditional sandblasting is mostly carried out at room temperature. The oxide scale formed after tempering of ball pins has high hardness and strong adhesion, which requires high-pressure sandblasting to remove. This can easily lead to scratches on the ball head surface, stress concentration in the rod, and even affect the stable metallographic structure formed after tempering, reducing the fatigue life of the ball pin. Some processes adopt the "high temperature carbonization + cooling sandblasting" mode, but there is still a risk of temperature loss and secondary oxidation.

[0005] 3. Significant Energy Consumption and Environmental Pressure: The independent sandblasting process requires additional consumption of compressed air, sand, and power energy. In addition, a large amount of dust is generated during the sandblasting process. Although it can be treated by dust removal equipment, there is a risk of fugitive emissions, which does not meet the requirements of green production. At the same time, the cooling of the workpiece after tempering and the possible preheating process before sandblasting result in double waste of heat and high energy costs. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a tempering furnace device for automobile ball pin production.

[0007] To achieve the aforementioned objectives, the technical solution adopted by this invention includes: a furnace body, a rotating assembly at the top of the furnace body, mounting components equidistantly arranged on the circumferential side of the rotating shaft of the rotating assembly, and a rotating clamping mechanism within the mounting components for clamping and positioning automotive ball pins; an air supply pipe on one side of the top of the furnace body, a sandblasting conveying pipe on one side of the air supply pipe, the bottom end of the air supply pipe penetrating the furnace body and extending into the interior, and having a sandblasting nozzle inclinedly arranged to match the rotating clamping mechanism, with a high-temperature resistant solenoid valve at the sandblasting nozzle; the sandblasting nozzle is used to spray sand onto the automotive ball pins to clean the oxide layer, while simultaneously using the impact force of the spray to drive the rotating clamping mechanism to rotate the automotive ball pins; and a collection mechanism at the bottom of the furnace body, with a filter assembly within the collection mechanism for separating protective gas, sand, and oxide layer debris.

[0008] Preferably, the rotating component includes a motor mounted at the top of the furnace body, a rotating shaft fixedly mounted at the output end of the motor, the rotating shaft passing through the furnace body and extending into the interior, and mounting components equidistantly mounted on the circumferential side of the rotating shaft; the motor drives the rotating shaft to rotate, causing the mounting components and the automobile ball pin to rotate synchronously.

[0009] Preferably, a support rod is fixedly installed at the bottom of the rotating shaft, and the bottom of the support rod is connected to the bottom of the furnace body through a bearing seat; the support rod and the bearing seat cooperate to support the rotating shaft.

[0010] Preferably, the mounting assembly includes fixed rods equidistantly arranged on the circumferential side of the rotating shaft, with a mounting base at the end of each fixed rod and a rotating clamping mechanism inside the mounting base.

[0011] Preferably, the rotating clamping mechanism includes rotating rods symmetrically arranged in the mounting base, with rotating plates fixedly installed at the ends of the rotating rods that are close to each other. Clamping plates are installed on the side walls of the rotating plates via guide telescopic rods, and springs are sleeved on the outside of the guide telescopic rods, with the springs located between the rotating plates and the clamping plates. The guide telescopic rods restrict the movement direction of the clamping plates, the springs provide elastic clamping force, and the rotating rods can drive the clamping plates and ball pins to rotate.

[0012] Preferably, anti-slip pads are provided on the side walls of the two clamping plates in the same mounting base that are close to each other, and the anti-slip pads are provided with protrusions at equal intervals; the anti-slip pads and protrusions increase the friction between the clamping plates and the ball pins.

[0013] Preferably, the air supply pipe has a spiral air guide channel inside to assist in mixing the gas and sand, and a Venturi feeder is also provided between the air supply pipe and the sandblasting nozzle; the Venturi feeder is used to draw the sand in the sandblasting conveying pipe into the air supply pipe to realize the mixing and spraying of sand and airflow.

[0014] Preferably, the collection mechanism includes a collection hopper located at the bottom of the furnace body, a high-temperature resistant pneumatic butterfly valve between the collection hopper and the connecting pipe, a filter box located at the bottom of the collection hopper via the connecting pipe, a protective gas return pipe located at the top of the filter box, a debris discharge pipe located at the bottom of the filter box, and a sand recovery pipe located on the side wall of the filter box away from the connecting pipe. Both the sand recovery pipe and the debris discharge pipe are equipped with electrically controlled valves. The collection hopper is used to collect sand and debris, the protective gas return pipe is used to recover protective gas, and the sand recovery pipe is used to recover sand.

[0015] Preferably, the filter assembly includes a first filter screen and a second filter screen that are inclinedly disposed inside the filter box. The first filter screen is located at the top and is used to filter the protective gas, while the second filter screen is located at the bottom and is used to filter oxide layer debris in the sand.

[0016] Compared with the prior art, the advantages of the present invention include: (1) The present invention provides a tempering furnace device for automobile ball pin production, which realizes the integrated continuous operation of tempering and sandblasting cleaning, and completely breaks the bottleneck of process separation: After the ball pin is heat treated in the tempering furnace, it does not need to be cooled and transferred. It can be directly sandblasted in the furnace using residual heat, saving the transfer time between processes. No additional clamping tooling is required, realizing continuous production and greatly improving work efficiency. At the same time, the motion control logic is optimized. When sandblasting, the motor stops its revolution and only relies on the sandblasting impact force to drive the rotating rod to drive the ball pin to rotate, realizing the all-round cleaning of a single group of ball pins without dead angles. After a single group is completed, the motor drives the revolution to switch the workpiece. After all four groups are cleaned, the revolution can be restarted for secondary tempering, which avoids secondary oxidation and takes into account the cleaning accuracy and tempering quality, ensuring the stability of metallographic structure. (2) The present invention provides a tempering furnace device for automobile ball pin production. Relying on the high temperature environment inside the furnace and the inert hot air sandblasting mode, it can efficiently remove the oxide scale with reduced adhesion under high temperature without high pressure. It avoids the problems of ball head scratches and stress concentration in the rod caused by high-pressure sandblasting at room temperature, effectively protects the stable metallographic structure formed after tempering, and improves the fatigue life of the ball pin. At the same time, the inert hot air supplied by the air supply pipe not only provides a protective atmosphere for tempering and prevents excessive oxidation during the tempering and cleaning of the ball pin, but also improves the sandblasting effect with the help of residual heat. No additional preheating is required, reducing temperature loss. (3) The present invention provides a tempering furnace device for automobile ball pin production. The protective gas is recovered and filtered and then fed back to the air supply device for recycling. The sand is separated, purified and then recycled and reused, reducing the consumption of sand and inert gas. The integrated operation inside the furnace eliminates the steps of workpiece cooling and sandblasting preheating, avoiding double waste of heat and reducing energy consumption costs. At the same time, the sandblasting process is carried out in a closed furnace body. With the help of the collection mechanism and filter components, dust and debris are centrally processed, eliminating the risk of fugitive emissions and controlling pollution from the source. (4) The present invention provides a tempering furnace device for automobile ball pin production, which integrates tempering, step-by-step sandblasting cleaning, secondary tempering and resource recovery functions, simplifies the production process and improves processing efficiency; the electrical control realizes the orderly linkage of "first turn on the air → then turn on the sand → stop the sandblasting and then stop the airblasting", and with the sandblasting and cleaning design after stopping the sandblasting, it avoids the blockage of sand material residue in the pipe and ensures the stable operation of the equipment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a tempering furnace device for producing automobile ball pins according to the present invention; Figure 2 This is a schematic diagram of the structure between the rotating component and the rotating clamping mechanism in a tempering furnace device for producing automobile ball pins according to the present invention. Figure 3 This is a schematic diagram of the structure between the mounting components and the rotating clamping mechanism in a tempering furnace device for producing automobile ball pins according to the present invention. Figure 4 This is a schematic diagram of the structure between the air supply pipe and the sandblasting nozzle in a tempering furnace device for automobile ball pin production according to the present invention. Figure 5 This is a schematic diagram of the collecting mechanism in a tempering furnace device for automobile ball pin production according to the present invention; Figure 6 This is a schematic diagram of the internal structure of the filter box in a tempering furnace device for automobile ball pin production according to the present invention.

[0019] Figure label: 11. Furnace body; 12. Air supply pipe; 13. Sandblasting conveying pipe; 14. Venturi feeder; 15. Collection hopper; 16. Sandblasting nozzle; 17. Connecting pipe; 21. Motor; 22. Support rod; 23. Rotating shaft; 24. Bearing seat; 31. Filter box; 32. Protective gas return pipe; 33. Debris discharge pipe; 34. Sand recovery pipe; 35. Electrically controlled valve; 36. First filter screen; 37. Second filter screen; 41. Fixing rod; 42. Mounting base; 43. Rotating rod; 44. Rotating plate; 45. Guide telescopic rod; 46. Spring; 47. Clamping plate; 48. Anti-slip pad; 49. Protrusion. Detailed Implementation

[0020] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The technical solution, its implementation process, and principles will be further explained below with reference to the accompanying drawings and specific implementation examples in the embodiments of this application.

[0021] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, the present invention covers any substitutions, modifications, equivalent methods and solutions made on the spirit, principles and scope of the present invention as defined by the claims. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this application, the terms "first," "second," "third," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar words, do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including," and similar words, mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. The terms "connected" or "linked," and similar words, are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0023] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, when using positional terms such as "both sides," "outer side," and "upper and lower," it should be understood that they are used only for ease of understanding and description, taking into account that the structure may be oriented to other positions.

[0024] In the description of this application, unless otherwise expressly specified and limited, the technical or scientific terms used shall have the ordinary meaning understood by a person with ordinary skills in the art to which this application pertains. Terms such as “installation,” “connection,” and “joining” shall be interpreted broadly, for example, as fixed connection, detachable connection, mating connection, or integral connection. For a person skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0025] The present invention aims to introduce and explain the structural composition of a tempering furnace device for automobile ball pin production and the cooperation relationship between the various components. Unless otherwise specified, the dimensions, materials and manufacturing processes of the various components in the tempering furnace device for automobile ball pin production in the present invention can be selected according to specific circumstances, and no special limitations or explanations are made here.

[0026] Furthermore, to provide the public with a better understanding of the present invention, certain specific details are described in detail in the following description of the invention. However, those skilled in the art will fully understand the invention even without these detailed descriptions.

[0027] Please see Figures 1-6 A tempering furnace device for automobile ball pin production includes a furnace body 11, which is a rectangular box structure. The outer wall is covered with a 50mm thick rock wool insulation layer, and the inner wall is lined with a high-temperature resistant ceramic lining to prevent high-temperature corrosion. The furnace body 11 is equipped with a wear-resistant lining (made of high manganese steel / wear-resistant stainless steel plate) to improve wear resistance. A door is connected to one side of the furnace body 11 by a hinge. A high-temperature resistant sealing gasket is installed on the inside of the door to ensure the sealing performance of the furnace body. An observation window is embedded in the door to facilitate observation of the internal processing status. Electric heating wires are evenly arranged on the inner side wall of the furnace body as tempering heating elements, which can adjust the furnace temperature to 200-600℃ to meet the requirements of automobile ball pin tempering process.

[0028] A rotating assembly is bolted to the top of the furnace body 11. The rotating assembly includes a motor 21. A rotating shaft 23 is fixed to the output end of the motor 21 via a coupling. The rotating shaft 23 passes through the sealed bearing at the top of the furnace body 11 and extends into the furnace body. A support rod 22 is welded to the bottom of the rotating shaft 23. The support rod 22 is made of stainless steel. Its bottom end is connected to the bottom of the furnace body 11 via a bearing seat 24. The bearing seat 24 is bolted to the bottom of the furnace body and works with the support rod 22 to support the rotating shaft 23 and improve the stability of its revolution.

[0029] Four sets of mounting components are equidistantly arranged on the side of the rotating shaft 23, evenly distributed along the circumference of the rotating shaft 23 (with an included angle of 90°), which can clamp four automotive ball pins at the same time, balancing processing efficiency and equipment operation stability. The number of mounting components can also be flexibly adjusted according to production batch and ball pin specifications. The mounting components include a fixing rod 41, which is welded to the rotating shaft 23. The end of the fixing rod 41 away from the rotating shaft 23 is welded with a mounting base 42, which is made of carbon steel and has a U-shaped structure. It is equipped with a rotating clamping mechanism inside for clamping and positioning automotive ball pins.

[0030] The rotating clamping mechanism includes two rotating rods 43 symmetrically arranged within the mounting base 42. The rotating rods 43 are made of stainless steel and are rotatably connected to the mounting base 42 via deep groove ball bearings, allowing for flexible rotation. A rotating plate 44 is welded to the close ends of the rotating rods 43. The rotating plate 44 is made of carbon steel and is circular. A clamping plate 47 is connected to the side wall of the rotating plate 44 via a guide telescopic rod 45. The guide telescopic rod 45 is made of stainless steel and consists of an inner rod and an outer tube that slide together to restrict the movement direction of the clamping plate 47 and prevent deviation. A spring 46 is sleeved on the outside of the guide telescopic rod 45. The spring 46 is a cylindrical helical compression spring located between the rotating plate 44 and the clamping plate 47, providing elastic clamping force to accommodate automotive ball joints of different diameters.

[0031] Anti-slip pads 48 are bonded to the side walls of the two clamping plates 47 in the same mounting base 42 that are close to each other. Both the anti-slip pads 48 and the surface protrusions 49 are made of high-temperature resistant ceramic fiber composite material. The protrusions 49 are hemispherical. This material is high-temperature resistant, wear-resistant and has an excellent coefficient of friction. It can not only adapt to the high-temperature environment in the tempering furnace, but also significantly increase the friction between the clamping plate 47 and the ball pin, ensuring that the ball pin is firmly clamped and avoiding slippage during rotation. At the same time, it can reduce the wear on the surface of the ball pin.

[0032] A supply air pipe 12 is bolted to one side of the top of the furnace body 11. The supply air pipe 12 is made of stainless steel and is connected to an air supply device (including a hot air generator and an inert gas storage tank). The hot air generator heats nitrogen to 150-200℃ to form inert hot air, which is then introduced into the supply air pipe 12. The inside of the supply air pipe 12 is a spiral air guide channel, which extends the gas flow path and facilitates thorough mixing with the sand. A sandblasting conveying pipe 13 is connected to one side of the supply air pipe 12 via a flange. The sandblasting conveying pipe 13 is connected to an independent sand supply device (not shown in the figure). The sand supply device can precisely control the conveying volume and speed of quartz sand (particle size 0.1-0.3mm). A Venturi feeder 14 is installed between the supply air pipe 12 and the sandblasting nozzle 16. The Venturi feeder 14 uses the negative pressure of the airflow in the supply air pipe 12 to draw the sand in the sandblasting conveying pipe 13 into the supply air pipe 12, thereby achieving uniform mixing of the sand and the inert hot air.

[0033] The bottom end of the air supply duct 12 passes through the furnace body 11 and extends into the interior. An inclined sandblasting nozzle 16, made of stainless steel, is installed thereon. The nozzle 16 has an inclination angle of 15°-45°, matching the position of the ball pin on the rotating clamping mechanism. The spray direction is aimed at the surface of the ball pin. A high-temperature resistant solenoid valve, made of 304 stainless steel, is installed at the sandblasting nozzle 16. The valve body is made of stainless steel and the valve core is ceramic. It is suitable for temperatures ≤600℃ and pressure ≥0.8MPa. It is connected to the sandblasting port flange and the sealing gasket is made of graphite material. It is used to control the opening and closing of the sandblasting channel. The device realizes the linkage between air supply and sandblasting through the electrical control system. During sandblasting, the motor 21 stops its revolution and only relies on the sandblasting impact force to drive the rotating rod 43 to drive the ball pin to rotate, so as to achieve all-round cleaning of a single group of ball pins. After a single group is completed, the motor 21 restarts and drives the revolution to send the next group of ball pins to the bottom of the sandblasting port 16. After all the ball pins are cleaned in the cycle, the sandblasting is stopped. The motor 21 drives the ball pin to rotate for tempering treatment. The sandblasting port 16 is used to spray sand onto the car ball pins to clean the oxide layer. At the same time, the spraying impact force drives the rotating clamping mechanism to drive the car ball pin to rotate. The sandblasting process and the tempering process are carried out at different times and do not interfere with each other.

[0034] A collection mechanism is provided at the bottom of the furnace body 11. The collection mechanism includes a collection hopper 15, which is made of stainless steel and has an inverted conical structure. It is welded to the bottom of the furnace body 11 and is used to collect sand, oxide layer debris and inert hot air after sandblasting. A high-temperature resistant pneumatic butterfly valve is provided between the collection hopper 15 and the connecting pipe 17. The high-temperature resistant pneumatic butterfly valve has a carbon steel valve body, a ceramic liner, and a stainless steel valve plate. It is suitable for temperatures ≤600℃. The pneumatic actuator is linked with the electrical control system signal to control the opening and closing of the collection channel. The bottom of the collection hopper 15 is connected to a filter box 31 through the connecting pipe 17. An induced draft fan is provided on the connecting pipe 17 to accelerate the gas-solid mixture into the filter box 31. The rotating clamping mechanism and the sandblasting nozzle 16 are both made of high-temperature and wear-resistant materials; the high-temperature resistant solenoid valve and the high-temperature resistant pneumatic butterfly valve are linked with the electrical control system to achieve time-series coordination with the air supply, sandblasting and recycling processes.

[0035] The filter box 31 is made of carbon steel and contains a filter assembly. The filter assembly includes a first filter screen 36 and a second filter screen 37, which are inclined at an angle of 10°-20° to facilitate the sliding of impurities. The first filter screen 36, located at the top, is made of stainless steel and has a pore size of 0.05mm. It is used to filter fine oxide debris in the inert gas. The filtered inert gas is transported back to the air supply device through the protective gas return pipe 32 at the top for recycling. The second filter screen 37, located at the bottom, is made of stainless steel and has a pore size of 0.2mm. It is used to filter oxide layer debris (particle size greater than 0.3mm) in the sand. The purified sand falls to one side of the bottom of the filter box 31 and is recovered through the sand recovery pipe 34 to the sandblasting conveying pipe 13 for reuse. A debris discharge pipe 33 is provided at the bottom of the filter box 31 to discharge the filtered oxide layer debris. Both the sand recovery pipe 34 and the debris discharge pipe 33 are equipped with an electric control valve 35 to control the timing of discharge and recovery.

[0036] The work process is as follows: Loading and clamping: Open the chamber door and place the automotive ball pins to be tempered between the clamping plates 47 in the four sets of mounting seats 42. The spring 46 pushes the clamping plates 47 to clamp the ball pins. The anti-slip pads 48 and protrusions 49 made of ceramic fiber composite material enhance the friction and ensure a firm clamping. Close the chamber door. The high-temperature resistant solenoid valve and the high-temperature resistant pneumatic butterfly valve are both in the closed state. The furnace body is completely sealed. The rock wool insulation layer + sealing gasket + double valves form a triple sealing guarantee to ensure that the inert gas does not leak during tempering and sandblasting.

[0037] Preliminary tempering: Start the electric heating wire to raise the furnace temperature to the preset tempering temperature (e.g., 450℃). At the same time, start the air supply device through the electrical control system to introduce inert hot air into the air supply pipe 12 to fill the furnace body and form a protective atmosphere to prevent excessive oxidation of the ball pins during tempering. Start the motor 21 to drive the rotating shaft 23 to rotate the 4 sets of ball pins at a uniform speed (5-10 r / min) so that the ball pins are heated evenly and the tempering is carried out for a preset time (e.g., 2 hours).

[0038] Step-by-step sandblasting: After tempering, maintain the inert hot air supply and furnace temperature, and execute the sandblasting program through the electrical control system. Open the high-temperature resistant solenoid valve and the high-temperature resistant pneumatic butterfly valve, following the logic of "open the air first, then open the sand": The air supply device continues to run. After the airflow in the air duct stabilizes, the sand supply device is started. The sand is sucked into the air supply pipe 12 by the Venturi feeder 14 through the sandblasting conveyor pipe 13, mixed with the inert hot air, and sprayed from the sandblasting nozzle 16. At the same time, the motor 21 stops its revolution. The sandblasting impact force drives the ball pin currently aligned with the sandblasting nozzle 16 to rotate, realizing the all-round oxide layer cleaning of this group of ball pins (single group cleaning time 2.5-3.75min, total cleaning time 10-15min). After the single group cleaning is completed, the sand supply device stops feeding sand, the motor 21 restarts and drives the rotating shaft 23 to rotate 90°, accurately sending the next group of ball pins below the sandblasting nozzle 16. After the revolution stops, the sand supply device restarts and repeats the above single group cleaning process until all 4 groups of ball pins are cleaned.

[0039] Purging and Resource Recovery: After all four sets of ball pins have been cleaned, the "stop spraying, stop sand first, then stop air" logic is executed. The sand supply device immediately stops supplying sand, while the air supply device continues to supply air for 0.5 to 1 minute. Inertial hot air is used to purge the air supply pipe 12, the Venturi feeder 14, and the sandblasting nozzle 16, blowing all the residual sand in the pipe into the furnace body to prevent sand from clumping and clogging the air duct and nozzle. After purging, the air supply device is turned off, and the induced draft fan is started to draw the mixture of sand, oxide layer debris, and inert gas in the furnace body into the filter box 31 through the collection hopper 15 and the connecting pipe 17. The first filter screen 36 filters the fine debris in the gas, and the filtered inert gas is transported back to the air supply device through the protective gas return pipe 32 for recycling. After gas-solid separation is completed, the high-temperature resistant pneumatic butterfly valve is immediately closed to block the backflow of external air. The second filter screen 37 separates the sand and oxide layer debris. The purified sand falls to one side of the bottom of the filter box 31, while the oxide debris is deposited at the bottom of the box. After the gas-solid separation is completed, the sand recovery pipe 34 and the debris discharge pipe 33 are controlled by the electric control valve 35 respectively to recover the sand to the sand supply device for reuse, and the oxidized debris is centrally discharged for treatment.

[0040] Secondary tempering and material resetting: After resource recovery is completed, the induced draft fan and electric control valve 35 are turned off, and the high-temperature resistant pneumatic butterfly valve and high-temperature resistant solenoid valve are kept closed. The furnace body is restored to complete sealing. The electric heating wire and air supply device are restarted to maintain the preset temperature in the furnace. At the same time, the motor 21 is started to drive the 4 sets of ball pins to revolve for secondary tempering (holding time 30 minutes) to further improve the mechanical properties of the ball pins. After the secondary tempering is completed, all equipment is turned off. After the furnace body cools down to room temperature naturally, the box door is opened, the clamping plate 47 is pulled outward, the spring 46 is stretched, the processed automobile ball pins are taken out, and a small amount of residual sand in the furnace is cleaned up to complete one processing cycle.

[0041] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It should not be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A tempering furnace apparatus for automobile ball pin production, comprising a furnace body (11), characterized in that: A rotating assembly is provided at the top of the furnace body (11). An installation assembly is provided at equal intervals on the circumference of the rotating shaft (23) of the rotating assembly. A rotating clamping mechanism is provided in the installation assembly for clamping and positioning the car ball pin. An air supply pipe (12) is provided on one side of the top of the furnace body (11). A sandblasting conveying pipe (13) is provided on one side of the air supply pipe (12). The bottom end of the air supply pipe (12) passes through the furnace body (11) and extends into the interior. A sandblasting nozzle (16) adapted to the rotating clamping mechanism is provided at an incline. A high-temperature resistant solenoid valve is provided at the sandblasting nozzle (16). The sandblasting nozzle (16) is used to spray sand onto the car ball pin to clean the oxide layer. At the same time, the impact force of the spray drives the rotating clamping mechanism to drive the car ball pin to rotate. A collection mechanism is provided at the bottom of the furnace body (11). A filter assembly is provided in the collection mechanism for separating the protective gas, sand and oxide layer debris.

2. The tempering furnace apparatus for automobile ball pin production according to claim 1, characterized in that: The rotating assembly includes a motor (21) installed at the top of the furnace body (11). A rotating shaft (23) is fixedly installed at the output end of the motor (21). The rotating shaft (23) passes through the furnace body (11) and extends into the interior. The mounting assembly is equidistantly arranged on the circumferential side of the rotating shaft (23). The motor (21) drives the rotating shaft (23) to rotate, thereby driving the mounting assembly and the automobile ball pin to rotate synchronously.

3. The tempering furnace apparatus for automobile ball pin production according to claim 2, characterized in that: A support rod (22) is fixedly installed at the bottom of the rotating shaft (23). The bottom of the support rod (22) is connected to the bottom of the furnace body (11) through the bearing seat (24). The support rod (22) and the bearing seat (24) cooperate to support the rotating shaft (23).

4. The tempering furnace apparatus for automobile ball pin production according to claim 3, characterized in that: The mounting assembly includes fixed rods (41) equidistantly arranged on the circumferential side of the rotating shaft (23), with a mounting base (42) at the end of the fixed rods (41) and a rotating clamping mechanism inside the mounting base (42).

5. The tempering furnace apparatus for automobile ball pin production according to claim 4, characterized in that: The rotating clamping mechanism includes rotating rods (43) symmetrically arranged in the mounting base (42). The ends of the rotating rods (43) that are close to each other are fixedly provided with rotating plates (44). A clamping plate (47) is provided on the side wall of the rotating plate (44) through a guide telescopic rod (45). A spring (46) is sleeved on the outside of the guide telescopic rod (45). The spring (46) is located between the rotating plate (44) and the clamping plate (47). The guide telescopic rod (45) restricts the movement direction of the clamping plate (47). The spring (46) provides elastic clamping force. The rotating rods (43) can drive the clamping plate (47) and the ball pin to rotate.

6. The tempering furnace apparatus for automobile ball pin production according to claim 5, characterized in that: Anti-slip pads (48) are provided on the side walls of the two clamps (47) in the same mounting base (42) that are close to each other, and protrusions (49) are provided at equal intervals on the anti-slip pads (48); the anti-slip pads (48) and the protrusions (49) increase the friction between the clamps (47) and the ball pin.

7. A tempering furnace apparatus for automobile ball pin production according to claim 1 or 6, characterized in that: The air supply pipe (12) has a spiral air guide channel inside, which is used to assist the mixing of gas and sand. A Venturi feeder (14) is also provided between the air supply pipe (12) and the sandblasting nozzle (16). The Venturi feeder (14) is used to suck the sand in the sandblasting conveying pipe (13) into the air supply pipe (12) to realize the mixing and spraying of sand and airflow.

8. The tempering furnace apparatus for automobile ball pin production according to claim 7, characterized in that: The collection mechanism includes a collection hopper (15) at the bottom of the furnace body (11), a high-temperature resistant pneumatic butterfly valve between the collection hopper (15) and the connecting pipe (17), a filter box (31) at the bottom of the collection hopper (15) through the connecting pipe (17), a protective gas return pipe (32) at the top of the filter box (31), a debris discharge pipe (33) at the bottom of the filter box (31), a sand recovery pipe (34) on the side wall of the filter box (31) away from the connecting pipe (17), and an electric control valve (35) on both the sand recovery pipe (34) and the debris discharge pipe (33); the collection hopper (15) is used to collect sand and debris, the protective gas return pipe (32) is used to recover protective gas, and the sand recovery pipe (34) is used to recover sand.

9. The tempering furnace apparatus for automobile ball pin production according to claim 8, characterized in that: The filter assembly includes a first filter screen (36) and a second filter screen (37) inclinedly disposed inside the filter box (31). The first filter screen (36) is located at the top and is used to filter protective gas, while the second filter screen (37) is located at the bottom and is used to filter oxide layer debris in the sand.

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