Heat treatment device for automobile parts

Abstract

The invention discloses an automobile part heat treatment device, and relates to the technical field of automobile part heat treatment. The automobile part heat treatment device comprises two L-shaped seats which are arranged in a central symmetry mode up and down, a connecting telescopic part is jointly arranged between the two L-shaped seats, the opposite sides of the transverse sections of the two L-shaped seats are fixedly connected with first bearing frames, and the two second bearing frames are distributed in a left-right staggered mode; the right end face of the vertical section of the L-shaped base located on the lower portion is fixedly connected with a bearing block used for abutting against and bearing the second bearing frame located on the lower portion, and a clamping and locking mechanism used for locking and limiting the rotated second bearing frame is jointly arranged between the two L-shaped bases and the second bearing frame. And the mode that the four rectangular net cages are distributed in a rectangular shape and directly face the heating rods for heating is achieved, it is guaranteed that all the parts can be evenly heated, and therefore the heat treatment quality is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of automobile part heat treatment, in particular to an automobile part heat treatment device. BACKGROUND

[0002] Automobile part heat treatment is an important process in the manufacturing process. By heating, holding and cooling metal parts, the metallographic structure of the parts can be changed, the strength, hardness, wear resistance and fatigue life of the parts can be improved, and the parts can meet the use requirements of automobiles under complex working conditions. Among many parts, the column sleeve-shaped parts (such as valve guide, connecting rod small head bushing, gear shaft bushing, needle bearing outer sleeve, shock absorber cylinder sleeve, etc.) are often used as the support, guide or wear-resistant elements between shafts and holes, and thus long-term bear friction and load during work. Therefore, the heat treatment process is particularly critical. The current common production method is to input the column sleeve-shaped parts into a rectangular box through a conveying belt, then stack multiple rectangular boxes on a transfer frame in sequence, and finally push the whole into a heating furnace for treatment.

[0003] However, in this process, firstly, there is a problem of uneven distribution of parts. Since the column sleeve-shaped parts are small in size and easy to roll, the parts are often piled together in a local area of the box during the unloading of the conveying belt, resulting in uneven paving of the parts. If manual dispersion and arrangement are relied on, not only the additional labor intensity and time cost are increased, but also there is a certain safety risk, such as the risk of pinching hands and scratching caused by the accumulation of parts and the rough edge area of the parts.

[0004] More importantly, when multiple rectangular boxes are stacked and then enter the heating furnace, although heating rods are arranged around the furnace, heat mainly conducts from the outer wall to the inner wall. The outer rectangular boxes and their parts can quickly reach the set temperature, while the boxes in the middle area of the stack are heated slowly due to the long heat transfer path and poor air flow, resulting in uneven heating of the parts and problems of incomplete heat treatment or performance deviation. In theory, the heat can be gradually transferred to the middle area by prolonging the heating time, but this will increase the heat treatment time, and prolonging the heating may also cause the growth of part grains, surface oxidation or decarburization, thereby affecting the heat treatment quality and part life. SUMMARY

[0005] The application provides an automobile part heat treatment device, which solves the technical problems that the existing automobile parts are prone to local accumulation during unloading, manual dispersion has large labor intensity and safety risks such as pinching hands and scratching, and the outer parts are heated quickly while the middle area is insufficiently heated due to the long heat transfer path and poor air flow when multiple rectangular boxes are stacked and heated, resulting in uneven heat treatment.

[0006] The application provides a kind of automobile parts heat treatment device, including two L-shaped seats that are arranged symmetrically in the center, two L-shaped seats are commonly provided with connecting stretchable part, the opposite side of the horizontal section of two L-shaped seats is fixedly connected with a bearing frame, the opposite side of the vertical section of two L-shaped seats is hinged with the bearing frame of the same structure as the first bearing frame through lug, two bearing frames are distributed in left and right staggered, the first bearing frame and the second bearing frame are respectively provided with a spreading placement part for placing parts and automatically spreading, the L-shaped seat in the upper part is provided with a supporting part for supporting and limiting the second bearing frame in the horizontal position, the vertical section of the L-shaped seat in the lower part is fixedly connected with a supporting block for supporting the second bearing frame in the lower part, two second bearing frames are cooperated with each other and rotated to the position perpendicular to the first bearing frame, and then four spreading placement parts are driven to be distributed in matrix to ensure that the parts are evenly heated, and the connecting stretchable part is commonly provided with a locking mechanism for locking the second bearing frame after rotation.

[0007] In a possible implementation, the spreading placement part on the first bearing frame includes a rectangular net box slidingly connected to the first bearing frame, a net plate slidingly connected to the rear wall plate of the first bearing frame, and a clamping assembly arranged between the net plate and the first bearing frame.

[0008] In a possible implementation, the locking mechanism includes an ear seat, an ear hole plate and a plug column, the opposite sides of the horizontal section of two L-shaped seats are fixedly connected with ear seats, and the two ear seats are symmetrically distributed, the side close to the corresponding ear seat of the second bearing frame is fixedly connected with an ear hole plate, the ear seat is provided with a bayonet slot for sliding the ear hole plate, the plug column slidingly connected to the ear seat passes through the bayonet slot, the limit spring is fixedly connected between the plug column and the ear seat, and the side close to the ear hole plate of the plug column gradually inclines to the side close to the axis from front to back.

[0009] In a possible implementation, the connecting stretchable part includes a sliding cylinder fixedly connected to the left and right sides of the lower L-shaped seat through a connecting block and a support plate slidingly connected in the sliding cylinder, the upper end surface of the support plate is fixedly connected to the upper L-shaped seat through a fixed block, the opposite sides of the two sliding cylinders are slidingly connected with limit insertion plates, and the lower parts of the two support plates are provided with insertion holes matched with the limit insertion plates.

[0010] In a possible implementation, the horizontal section of the two L-shaped seats is provided with a rectangular through slot corresponding to the position of the first bearing frame.

[0011] In a possible implementation, the supporting part includes a sliding groove provided in the front end surface of the upper L-shaped seat and an L-shaped supporting rod slidingly connected in the sliding groove, and the horizontal section of the L-shaped supporting rod abuts against the lower part of the upper second bearing frame.

[0012] In one possible implementation, the snap-fit ​​assembly includes strip-shaped through slots formed on the left and right side panels of the first bearing frame, two L-shaped rods respectively fixedly connected to the left and right sides of the mesh plate and slidably located in the strip-shaped through slots, a lever hinged to the lower side of the L-shaped rods via a rotating post and a torsion spring, and inclined sliding slots formed on the left and right opposite sides of the first bearing frame, with sliding blocks slidably connected in the sliding slots, and a top spring fixedly connected between the sliding blocks and the sliding slots, and a limiting post cooperating with the lever fixedly connected to the side of the sliding block away from the first bearing frame.

[0013] In one possible implementation, a limiting baffle for limiting the position of the lever is fixedly connected to the front side of the lower end of the vertical section of the L-shaped rod, and the sliding groove is in an inclined state with the front higher than the back.

[0014] As can be seen from the above technical solutions, the present invention has the following advantages: In the present invention, by pushing the mesh plate forward during the part loading process, the stacked parts are automatically flattened, realizing the automatic and uniform dispersion of the column sleeve-shaped parts, ensuring that each part can be fully exposed to the heat source environment, and eliminating the need for manual sorting one by one, avoiding operators from frequently reaching into the parts stacking area, and eliminating safety hazards such as pinching, scratching, and burning.

[0015] In this invention, by arranging four rectangular mesh cages in a rectangular shape to directly face the heating rod for heating, the heating path is shortened, and the heat can be applied directly and quickly to the surface of the parts. This avoids the situation of overheating of the outer layer and underheating of the middle layer in the traditional stacked heat treatment method, so that each mesh cage and its internal parts can be heated evenly, thereby improving the heat treatment quality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the heat treatment device for automotive parts provided by the present invention.

[0018] Figure 2 This is a schematic diagram of the connection structure of the first bearing frame, the second bearing frame, and the L-shaped seat provided by the present invention.

[0019] Figure 3 This is a schematic diagram of the installation structure of the locking mechanism provided by the present invention.

[0020] Figure 4 This is a cross-sectional view of the connection between the ear seat and the insertion post provided by the present invention.

[0021] Figure 5 This is a cross-sectional structural diagram of the connecting telescopic part provided by the present invention.

[0022] Figure 6 This is a schematic diagram of the installation structure of the distribution placement part provided by the present invention.

[0023] Figure 7 Provided by the present invention Figure 6 An enlarged schematic diagram of part A of the structure.

[0024] Figure 8 This is a schematic diagram of the disassembled structure of the distribution placement part provided by the present invention.

[0025] Figure 9 This is a diagram showing the unfolded state of the present invention during the heating operation.

[0026] The above-mentioned attached drawings include the following reference numerals: 1. L-shaped seat; 2. Connecting telescopic part; 21. Slide cylinder; 22. Support plate; 23. Limiting insert plate; 24. Insertion hole; 3. First bearing frame; 4. Second bearing frame; 5. Spreading placement part; 51. Rectangular mesh box; 52. Mesh plate; 53. Snap-fit ​​assembly; 531. Strip groove; 532. L-shaped rod; 533. Toggle rod; 534. Sliding groove; 535. Limiting post; 536. Limiting baffle; 6. Support part; 61. Slide groove; 62. L-shaped support rod; 7. Support block; 8. Locking mechanism; 81. Ear seat; 82. Ear hole plate; 83. Insertion post. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Please see Figure 1 and Figure 2This invention provides a technical solution: a heat treatment device for automotive parts, comprising two L-shaped seats 1 arranged symmetrically at an angle, with a connecting telescopic part 2 between the two L-shaped seats 1. A first-order support frame 3 is fixedly connected to opposite sides of the transverse sections of the two L-shaped seats 1. Rectangular through slots corresponding to the positions of the first-order support frames 3 are formed on the transverse sections of the two L-shaped seats 1. Second-order support frames 4, with the same structure as the first-order support frames 3, are hinged to opposite sides of the vertical sections of the two L-shaped seats 1 via lugs. The two second-order support frames 4 are staggered left and right. The first-order support frames 3 and the second-order support frames 4 are respectively provided with mounting points for placing parts and... The spreading and dispersing placement part 5 has an L-shaped base 1 at the top, which is provided with a support part 6 for supporting and limiting the second bearing frame 4 located at the top and in a horizontal position. The right end face of the vertical section of the L-shaped base 1 at the bottom is fixedly connected with a support block 7 for touching and supporting the second bearing frame 4 located at the bottom. The two second bearing frames 4 cooperate with each other and rotate towards each other to a position perpendicular to the first bearing frame 3, thereby driving the four spreading and placing parts 5 to be distributed in a matrix to ensure that the parts are evenly heated. A locking mechanism 8 is provided between the two L-shaped bases 1 and the second bearing frame 4 to lock and limit the second bearing frame 4 after rotation.

[0029] Please see Figure 1 and Figure 5 In this embodiment, the connecting telescopic part 2 includes a slide cylinder 21 fixedly connected to the left and right sides of the lower L-shaped seat 1 by a connecting block and a support plate 22 slidably connected in the slide cylinder 21. The upper end face of the support plate 22 is fixedly connected to the upper L-shaped seat 1 by a fixing block. Limiting insert plates 23 are slidably connected to the opposite sides of the two slide cylinders 21. Insertion holes 24 that cooperate with the limiting insert plates 23 are opened at the lower part of the opposite sides of the two support plates 22.

[0030] Please see Figure 1 , Figure 6 , Figure 7 and Figure 8In this embodiment, the spreading and placing part 5 located on the first support frame 3 includes a rectangular mesh box 51 slidably connected to the first support frame 3, a mesh plate 52 slidably connected through the rear wall panel of the first support frame 3, and a snap-fit ​​assembly 53 disposed between the mesh plate 52 and the first support frame 3. The snap-fit ​​assembly 53 includes a strip-shaped through groove 531 formed on the left and right wall panels of the first support frame 3, and two L-shaped rods 532 respectively fixedly connected to the left and right sides of the mesh plate 52 and slidably located in the strip-shaped through groove 531. The lower side of the L-shaped rods 532 is open to the through groove 531. A lever 533 is hinged to a torsion spring through a rotating column. Inclined sliding grooves 534 are provided on the left and right opposite sides of the first bearing frame 3. A sliding block is slidably connected in the sliding groove 534, and a top spring is fixedly connected between the sliding block and the sliding groove 534. A limiting post 535 that cooperates with the lever 533 is fixedly connected to the side of the sliding block away from the first bearing frame 3. A limiting baffle 536 for limiting the lever 533 is fixedly connected to the front side of the lower end of the vertical section of the L-shaped rod 532. The sliding groove 534 is in an inclined state with the front higher than the back.

[0031] Before heat treatment of the parts, the support plate 22 is retracted into the slide cylinder 21. At this time, the distance between the two L-shaped seats 1 is at its shortest. Before heat treatment, manually pull the upper L-shaped seat 1 upward. The upper L-shaped seat 1 drives the support plate 22 upward until it reaches its maximum height. Then press the limiting insert 23 into the insertion hole 24 to lock the support plate 22 extending from the slide cylinder 21. Next, pull out the rectangular mesh box 51 to receive the conveyed parts. After receiving them, slide the rectangular mesh box 51 from bottom to bottom into the first bearing frame 3 and the second bearing frame 4. After box 51 is placed in the first carrier frame 3 or the second carrier frame 4, the mesh plate 52, which was initially located at the rear of the first carrier frame 3 or the second carrier frame 4, is pushed forward. The distance between the mesh plate 52 and the bottom of the rectangular mesh box 51 is slightly larger than the diameter of the column sleeve-shaped part. The column sleeve-shaped part is placed in the rectangular mesh box 51 in a flat state. When the mesh plate 52 moves forward, it will collide with and push forward the parts that are piled up together, pushing the parts to the empty position in the rectangular mesh box 51, thereby automatically pushing the parts apart until the mesh plate 52 moves forward and completely seals the upper part of the rectangular mesh box 51.

[0032] As the mesh plate 52 moves forward, it simultaneously drives the L-shaped rod 532 to slide in the strip groove 531. The L-shaped rod 532 then drives the lever 533 to move synchronously. When the lever 533 moves forward and touches the limiting post 535, it will rotate around the hinge point with the L-shaped rod 532 until it passes the limiting post 535. The lever 533 will then rotate again under the action of the torsion spring and become vertical again. At this time, the mesh plate 52 completely covers the upper part of the rectangular mesh box 51. Then, the two second-level carrier frames 4 can be flipped and locked by controlling the support part 6 and the locking mechanism 8 in sequence. Then, the whole thing enters the heating furnace for heat treatment. After the heat treatment is completed and the parts have completely cooled down, the mesh plate 52 is manually pulled backward. The mesh plate 52 then drives the L-shaped rod 532 to move. The lever 533 moves, and then pushes the limiting post 535 backward. After the limiting post 535 is compressed, it drives the sliding block to move along the sliding groove 534, and the top spring is gradually compressed. Since the sliding groove 534 is inclined with the front higher than the back, the sliding block moves backward and gradually downward at the same time, which causes the limiting post 535 to move backward and downward at the same time, until the limiting post 535 moves down to a horizontal position lower than the lower end of the lever 533. At this time, the lever 533 moves backward past the limiting post 535, and the sliding block moves back to its original position under the action of the top spring, which in turn drives the limiting post 535 to its original position. The mesh plate 52 then moves backward to the initial position. At this time, the rectangular mesh box 51 can be pulled forward and pulled out. Finally, the heat-treated parts are poured out.

[0033] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 In this embodiment, the locking mechanism 8 includes an ear seat 81, an ear hole plate 82, and a pin 83. The two L-shaped seats 1 are fixedly connected to the opposite sides of their transverse sections, and the two ear seats 81 are centrally symmetrically distributed. The second bearing frame 4 is fixedly connected to the ear hole plate 82 on the side near the corresponding ear seat 81. The ear seat 81 has a slot for the ear hole plate 82 to slide into. The pin 83 is slidably connected to the ear seat 81 through the slot. The pin 83 and the ear seat 81 are fixedly connected together by a limit spring. The side of the pin 83 near the ear hole plate 82 gradually tilts towards its own axis from front to back.

[0034] Please see Figure 1 In this embodiment, the support part 6 includes a groove 61 formed on the front end face of the upper L-shaped seat 1 and an L-shaped support rod 62 slidably connected in the groove 61. The transverse section of the L-shaped support rod 62 abuts against the lower part of the upper second support frame 4.

[0035] After the mesh plate 52 moves forward and flattens the part in the rectangular mesh box 51, covering the upper part of the rectangular mesh box 51, first manually push the L-shaped support rod 62 to the left to move the L-shaped support rod 62 out from the lower part of the upper second support frame 4. Then, the second support frame 4 loses support and rotates downward around the hinge point with the upper L-shaped seat 1, while driving the rectangular mesh box 51 inside it to move synchronously. During the downward rotation to gradually become a vertical position, the upper second support frame 4 drives the upper ear plate 82 to gradually slide into the bayonet groove. The ear plate 82 is pressed against the inclined surface of the insertion post 83, causing the insertion post 83 to move forward until the ear plate 82 is completely slid into the bayonet groove. At this time, the insertion post 83 moves backward under the action of the limit spring and inserts into the ear hole of the ear plate 82, locking the upper second support frame 4, which is now in a vertical position.

[0036] Next, manually push the lower second support frame 4 to rotate around the hinge point with the lower L-shaped seat 1 until the second support frame 4 gradually becomes vertical. During the process of gradually rotating to a vertical state, the lower second support frame 4 drives the ear plate 82 connected to it to rotate and gradually slide into the bayonet groove on the left, and touch the inclined surface of the left insertion post 83. Then repeat the above steps, pressing the left insertion post 83 forward until the ear plate 82 is completely slid into the left bayonet groove. The insertion post 83 then moves backward and inserts into the ear plate 82. At this time, the first support frame 3 and the second support frame 4 together form a rectangular shape (e.g., Figure 9 (As shown), then push the L-shaped seat 1 to drive the rectangular mesh box 51 containing the parts into the heating furnace for heat treatment. The four rectangular mesh boxes 51 directly face the heat radiation of the heating rod, ensuring uniform and thorough heating.

[0037] After heat treatment, pull the two inserts 83 forward in sequence to move them out of the ear plate 82. Then, manually push the two No. 2 bearing frames 4 at the top and bottom to reset and reverse, so that they are horizontal again. Then, pull out the rectangular mesh box 51.

[0038] It is worth noting that while existing automotive parts heat treatment equipment can achieve mass production by loading cylindrical parts into rectangular boxes, stacking them, and then pushing them into a heating furnace for heat treatment, thus offering advantages such as large loading capacity and relatively simplified operation, it also has significant drawbacks. First, when using a conveyor belt to feed the cylindrical parts into the rectangular boxes, the parts, due to their small size and tendency to roll, often accumulate in localized areas and cannot be naturally and evenly spread out. Additional manual intervention is required to disperse and organize them, which not only increases labor intensity and costs but also necessitates personnel working near the equipment. The safety hazards of being pinched or scratched during intervention also reduce the overall automation level and efficiency of production. Secondly, when multiple rectangular boxes are stacked and pushed into the heating furnace, although heating rods are arranged around the furnace to provide a heat source, the heat is mainly transferred from the outer wall to the inside. The outer box can heat up relatively quickly, while the rectangular boxes and their internal parts in the middle of the stack heat up slowly, resulting in uneven heat treatment. To compensate for this deficiency, the heating time can only be extended to allow the middle area to gradually reach the required temperature, but this will significantly increase the production cycle and energy consumption, and may also easily cause grain growth in the parts. Surface oxidation or decarburization can have side effects, affecting part performance and lifespan. Heating processes also suffer from high energy consumption, long cycles, and unstable quality. This invention introduces an automatic leveling operation during the part loading process, enabling the cylindrical sleeve-shaped parts to be automatically and evenly dispersed and arranged before entering the heating station. This avoids the tedious manual flipping and sorting required in traditional methods, significantly improving loading efficiency and operational safety. Furthermore, the invention's structural layout arranges four rectangular mesh boxes 51 in a rectangular array, with even spacing between them, all facing the heating rod, ensuring the parts are evenly distributed during heating. During the heating process, the parts can simultaneously and uniformly receive heat radiation and conduction from the heat source. This multi-faceted simultaneous heating method improves the problems of uneven heating of parts, excessive internal and external temperature differences, high energy consumption, long heating cycles, and unstable final heat treatment quality caused by the existing technology. In addition, the combination design of automatic dispersion and uniform heating not only reduces the safety hazards such as high temperature burns that may be caused by manual operation, but also effectively reduces heat energy waste, improves the overall stability and consistency of the heat treatment process, and ensures the dimensional accuracy and mechanical properties of parts under mass production conditions, providing a reliable guarantee for subsequent processing and use.

[0039] During operation, first pull the upper L-shaped seat 1 to its highest position, and limit the movement of the L-shaped seat 1 by connecting the telescopic part 2. Then, pull out the rectangular mesh box 51 one by one and put the parts in. Then, put the rectangular mesh box 51 into the corresponding first support frame 3 and second support frame 4. Then, push the mesh plate 52 forward one by one to flatten and fill the empty area of ​​the rectangular mesh box 51 until the mesh plate 52 seals the upper part of the rectangular mesh box 51. Then, control the support part 6 to release the support of the upper second support frame 4. The upper second support frame 4 is rotated downwards until it becomes vertical. Then, the second support frame 4 is locked by the locking mechanism 8. Then, the lower second support frame 4 is manually flipped upwards to gradually become vertical. Then, the second support frame 4 is locked by the locking mechanism 8 again. Then, the L-shaped seat 1 is pushed to drive the four rectangular mesh boxes 51 into the heating furnace for heat treatment. After heat treatment, the mesh boxes are removed from the heating box and cooled. The above steps are reversed to remove the rectangular mesh boxes 51 containing the parts.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0041] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A heat treatment apparatus for automotive parts, comprising two L-shaped seats arranged vertically and centrally symmetrically, characterized in that: A connecting telescopic part is provided between the two L-shaped seats. A first bearing frame is fixedly connected to the opposite side of the horizontal section of the two L-shaped seats. A second bearing frame with the same structure as the first bearing frame is hinged to the opposite side of the vertical section of the two L-shaped seats through lugs. The two second bearing frames are staggered left and right. The first and second bearing frames are respectively provided with a spreading placement part for placing parts and automatically spreading them out. The upper L-shaped seat is provided with a support part for supporting and limiting the second bearing frame located at the upper and in a horizontal position. The right end face of the vertical section of the lower L-shaped seat is fixedly connected with a support block for touching and supporting the second bearing frame located at the lower part. The two No. 2 bearing frames cooperate to rotate towards each other to a position perpendicular to the No. 1 bearing frame, thereby driving the four distribution parts to be distributed in a matrix to ensure that the parts are evenly heated. The two L-shaped seats and the No. 2 bearing frames are jointly provided with a locking mechanism for locking and limiting the No. 2 bearing frames after rotation.

2. The heat treatment apparatus for automotive parts according to claim 1, characterized in that: The averaging placement part located on the first support frame includes a rectangular wire mesh box slidably connected to the first support frame, a wire mesh plate slidably connected through the rear wall panel of the first support frame, and a snap-fit ​​assembly disposed between the wire mesh plate and the first support frame.

3. The heat treatment apparatus for automotive parts according to claim 1, characterized in that: The locking mechanism includes an ear seat, an ear hole plate, and a pin. The two L-shaped seats are fixedly connected to opposite sides of their transverse sections, and the two ear seats are centrally symmetrically distributed. The ear hole plate is fixedly connected to the side of the second bearing frame near the corresponding ear seat. The ear seat has a slot for the ear hole plate to slide into. A pin is slidably connected to the ear seat, passing through the slot. A limit spring is fixedly connected between the pin and the ear seat. The side of the pin near the ear hole plate gradually tilts towards its own axis from front to back.

4. The heat treatment apparatus for automotive parts according to claim 1, characterized in that: The connecting telescopic part includes a slide cylinder fixedly connected to the left and right sides of the lower L-shaped seat by a connecting block and a support plate slidably connected in the slide cylinder. The upper end face of the support plate is fixedly connected to the upper L-shaped seat by a fixing block. Limiting inserts are slidably connected to the opposite sides of the two slide cylinders. Insertion holes that cooperate with the limiting inserts are opened at the lower part of the opposite sides of the two support plates.

5. The heat treatment apparatus for automotive parts according to claim 1, characterized in that: Both L-shaped seats have rectangular through slots on their transverse sections that correspond to the position of the first bearing frame.

6. The heat treatment apparatus for automotive parts according to claim 1, characterized in that: The supporting part includes a groove formed on the front end face of the upper L-shaped seat and an L-shaped support rod slidably connected in the groove, the transverse section of the L-shaped support rod abutting against the lower part of the upper second bearing frame.

7. The heat treatment apparatus for automotive parts according to claim 2, characterized in that: The snap-fit ​​assembly includes strip-shaped through slots formed on the left and right wall panels of the first bearing frame, two L-shaped rods respectively fixedly connected to the left and right sides of the mesh plate and slidably located in the strip-shaped through slots, and a lever hinged to the lower side of the L-shaped rods through a rotating post and a torsion spring. Inclined sliding slots are formed on the left and right opposite sides of the first bearing frame, and sliding blocks are slidably connected in the sliding slots. A top spring is fixedly connected between the sliding blocks and the sliding slots. A limiting post cooperating with the lever is fixedly connected to the side of the sliding block away from the first bearing frame.

8. The heat treatment apparatus for automotive parts according to claim 7, characterized in that: The lower end of the vertical section of the L-shaped rod is fixedly connected to a limiting baffle for limiting the position of the lever, and the sliding groove is inclined with the front higher than the back.

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