High-stress valve spring heat treatment furnace
By adopting a chain plate conveyor and limit locking structure in a high-stress valve spring heat treatment furnace, the problems of uneven heating and deformation of springs in traditional heat treatment furnaces are solved, and uniform heating and pitch fixation of the springs are achieved, and product quality is improved.
Patent Information
- Application Number
- CN202510401935.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2025-08-05
AI Technical Summary
Traditional heat treatment furnaces lack targeted support during the tempering of high-stress valve springs, resulting in uneven heating, residual stress release and spring deformation under the action of self-weight, increasing the defective rate.
A high-stress valve spring heat treatment furnace is designed, using a chain plate conveyor and a conveying carrier plate to set up a spring placing base and limit locking port. The spring is fixed and clamped by obliquely and vertical support plates to limit its freedom, ensure uniform heating and pitch fixation, and avoid deformation.
It realizes uniform heating and pitch fixation of the spring during tempering, reduces deformation, improves product quality and reduces defective rate.
Smart Images
Figure CN120425129A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of spring heat treatment, in particular to a high-stress valve spring heat treatment furnace. Background Art
[0002] Springs are important parts in high-stress valves. Tempering of springs is a key step in the spring heat treatment process. Its main purpose is to eliminate the internal stress and brittleness generated during the quenching process and improve the toughness and stability of the spring. However, during the tempering process, the spring will bend and deform under the pressure of its own gravity due to improper tempering temperature control, too long holding time, and improper placement of the spring. For high-stress valves, the deformation of the spring will cause the spring stiffness to deviate from the design value. If the spring stiffness decreases, the preload force provided by the spring is weakened, and the valve sealing decreases. If the spring stiffness increases, the valve operating resistance will increase or cause abnormal opening pressure.
[0003] When tempering special springs for high-stress valves, traditional heat treatment furnaces are used to heat and temper the springs. Traditional heat treatment furnaces use their own workpiece conveying mechanism to allow the springs to slowly pass through the furnace and are conveyed out through the conveying mechanism after a set time. However, traditional heat treatment furnaces lack racks or supports for springs. Due to the particularity of the spring structure, the springs deform during the tempering process due to uneven heating, residual stress release during insulation, and compression and bending under their own weight, resulting in an increase in the defective rate of the product. Summary of the Invention
[0004] The disclosed embodiments relate to a heat treatment furnace for high-stress valve springs, so as to solve the problem that when high-stress valve special springs are tempered, a traditional heat treatment furnace is used to heat and temper the springs. The traditional heat treatment furnace uses its own workpiece conveying mechanism to slowly pass the spring through the furnace, and transmits it out through the transmission mechanism after a set time. However, the traditional heat treatment furnace lacks a placement rack or support member set for the spring. Due to the particularity of the spring structure, the spring deforms during the tempering process due to uneven heating, residual stress release during insulation, and compression bending under the action of its own weight, resulting in an increased defective rate of the product.
[0005] In a first aspect of the present disclosure, a high-stress valve spring heat treatment furnace is provided, which specifically includes: a spring heat treatment furnace body, a chain plate conveyor is installed at the bottom of the spring heat treatment furnace body, the upper conveying surface of the chain plate conveyor passes horizontally through the inlet and outlet of the spring heat treatment furnace body, a control panel is installed in front of the chain plate conveyor, a conveying carrier is installed on the chain plate conveyor, and the conveying carrier is penetrated by six rectangular hot air circulation through-holes, the left and right sides of the hot air circulation through-holes are respectively fixedly connected to a spring placing base, and the upper part of the spring placing base is fixedly connected to a downward oblique The support plate and the upper edge of the lower oblique support plate are provided with an oblique limit lock mouth, and the conveying carrier is movably connected with a spring lifting lock frame, and the upper part of the spring lifting lock frame is fixedly connected with a lock frame connecting plate, and the lower surface of the lock frame connecting plate is connected to a vertical support plate, and the lower edge of the vertical support plate is provided with a vertical oblique lock mouth, and the front and rear ends of the lower part of the spring lifting lock frame are respectively fixedly connected with the lifting pull plate, and the lifting pull plate is rotatably connected to the limit push wheel through the bearing, and the left side of the inner surface of the chain conveyor side plate is fixedly connected with the lifting wheel rail through the bracket, and the right side of the inner surface of the chain conveyor side plate is fixedly connected with the limit lock rail through the bracket.
[0006] In at least some embodiments, a vertical guide opening is formed through the conveying carrier plate, and the vertical guide opening is slidably connected to a vertical support rod of the spring lifting lock frame.
[0007] In at least some embodiments, the oblique limiting lock opening is an arc-shaped notch, the opening edge of the oblique limiting lock opening is chamfered, and the angle between the left lower oblique support plate and the right lower oblique support plate is one hundred and twenty degrees.
[0008] In at least some embodiments, the spacing between adjacent oblique limit locks in the same lower oblique support plate is equal to the pitch of the processed spring in its natural state, and the oblique limit lock fits the outer surface of the effective ring of the processed spring in its natural state.
[0009] In at least some embodiments, the vertical support plate is perpendicular to the upper surface of the conveying carrier plate, the vertical oblique locking opening is facing directly downward, and the opening edge of the vertical oblique locking opening is chamfered.
[0010] In at least some embodiments, the spacing between adjacent vertical oblique locking openings in the same vertical support plate is equal to the pitch of the processed spring in its natural state, and the vertical oblique locking opening fits the outer surface of the effective ring of the processed spring in its natural state.
[0011] In at least some embodiments, the lifting wheel rail is parallel to the upper surface of the chain conveyor, and the left end of the lifting wheel rail is bent downward to form a lifting arc end.
[0012] In at least some embodiments, the lifting arc end is an arc-shaped structure, the center of the lifting arc end is located above the left end driven shaft of the chain conveyor, and the upper surface of the lifting wheel rail and the outer arc surface of the lifting arc end are rollingly connected to the limiting push wheel located at the upper left position of the chain conveyor.
[0013] In at least some embodiments, the position-limiting locking rail is parallel to the upper surface of the chain conveyor, and the left end of the position-limiting locking rail is bent upward to form a locking rail arc end.
[0014] In at least some embodiments, the arc end of the locking rail is in an arc-shaped structure, and the lower surface of the limiting locking rail and the outer arc surface of the locking rail arc end are rollingly connected to the limiting push wheel located above the chain conveyor.
[0015] The present invention provides a high-stress valve spring heat treatment furnace, which has the following beneficial effects: The heat treatment furnace in the present invention is specially used for tempering during heat treatment of high stress springs. The spring is smoothly fed into the main body of the spring heat treatment furnace through the cooperation of the chain conveyor and the conveying carrier. After the spring is tempered by the main body of the spring heat treatment furnace, the spring is sent out from the outlet of the main body of the spring heat treatment furnace. A spring placing base is provided above the conveying carrier. The spring is straightened and stably supported by the two spring placing bases so that the spring is placed horizontally. The deformation caused by compression and bending under the action of the spring's own weight during the tempering process can be reduced. The flow path of the hot air is retained through the hot air circulation through-hole, so that the hot air flows evenly through the spring, ensuring that the spring is heated evenly and avoiding the deformation of the spring due to uneven heating.
[0016] In addition, a vertical support plate is provided above the conveying carrier. During the tempering process, as the spring lifting lock frame and the vertical support plate move downward, the spring is fixedly clamped by two lower oblique support plates and one vertical support plate, and contacts the spring from three directions, which limits the freedom of the spring and reduces the radial deformation of the spring during tempering. At the same time, multiple oblique limit locks and vertical oblique locks are used to engage with each ring of the effective coil part of the spring to achieve the fixation of the spring pitch. By limiting the freedom of the spring, deformation caused by pitch changes during spring tempering is avoided.
[0017] In addition, through the setting of the lifting wheel rail and the limiting locking rail and the rolling connection between the limiting push wheel and the two rails, the freedom limiting function of the spring is automatically realized as the spring is transported to the inside of the spring heat treatment furnace body. In the conveying carrier before entering the spring heat treatment furnace body, the limiting push wheel at the bottom of the spring lifting lock frame at this position is rollingly connected to the upper surface of the lifting wheel rail, pushing the spring lifting lock frame upward to raise the vertical support plate, which is convenient for placing the spring. After the spring is placed above the two lower oblique support plates, the conveying carrier is transported to the right by the chain conveyor. Here, the limiting push wheel is separated from the lifting wheel rail and slides downward under its own gravity. As it slides with the arc end of the locking rail, the limiting push wheel is pulled downward, so that the vertical oblique lock mouth and the spring are automatically and tightly fitted. The automatic locking and limiting of the spring can be completed without manual or drive mechanism adjustment. The control is simple, and the operation and manufacturing costs are low. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.
[0019] The drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention.
[0020] In the attached figure: Figure 1 A schematic diagram showing the overall structure of the present application; Figure 2 Shows a structural schematic diagram of the chain conveyor of the present application; Figure 3 A schematic diagram showing the structural position of the lifting wheel rail and the limit lock rail installation position of the present application is shown; Figure 4 It shows a schematic diagram of the structure of the present application's limit push wheel under the influence of the lifting wheel rail and the limit lock rail; Figure 5 It shows a schematic structural diagram of the vertical support plate and the spring when the vertical support plate is separated from the spring; Figure 6 Shows this application Figure 5 The structural diagram below: Figure 7 A schematic diagram of the structure of the vertical support plate of the present application when in contact with the spring is shown; Figure 8 Shows this application Figure 7 The structural diagram below: Figure 9 Shows the application Figure 4 A schematic diagram of the partially enlarged structure at point A in the middle; Figure 10 Shows the application Figure 4 Schematic diagram of the locally enlarged structure at point B in the middle.
[0021] Reference Signs List 1. Spring heat treatment furnace body; 2. Chain conveyor; 4. Conveyor carrier; 401. Hot air circulation hole; 402. Vertical guide hole; 5. Spring placement base; 501. Lower oblique support plate; 502. Oblique limit lock; 6. Spring lifting lock frame; 601. Lock frame connecting plate; 602. Vertical support plate; 603. Vertical oblique lock; 604. Lifting pull plate; 605. Limit push wheel; 7. Lifting wheel rail; 701. Lifting arc end; 8. Limit lock rail; 801. Lock rail arc end; 9. Control panel. DETAILED DESCRIPTION
[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0023] Example 1: Please refer to Figures 1 to 10 : The present invention proposes a high-stress valve spring heat treatment furnace, comprising: a spring heat treatment furnace body 1, a chain plate conveyor 2 is installed at the bottom of the spring heat treatment furnace body 1, the upper conveying surface of the chain plate conveyor 2 passes horizontally through the inlet and outlet of the spring heat treatment furnace body 1, a control panel 9 is installed in front of the chain plate conveyor 2, a conveying carrier 4 is installed on the chain plate conveyor 2, and the conveying carrier 4 is penetrated by six rectangular hot air circulation through-holes 401, the left and right sides of the hot air circulation through-holes 401 are respectively fixedly connected to the spring placing base 5, and the upper part of the spring placing base 5 is fixedly connected to the lower oblique support plate 501, an oblique limit lock 502 is provided on the upper edge of the lower oblique support plate 501, and a spring lifting lock frame 6 is movably connected to the conveying carrier 4. The upper part of the spring lifting lock frame 6 is fixedly connected to the lock frame connecting plate 601. The lower surface of the lock frame connecting plate 601 is connected to the vertical support plate 602. The lower edge of the vertical support plate 602 is provided with a vertical oblique lock 603. The front and rear ends of the lower part of the spring lifting lock frame 6 are respectively fixedly connected to the lifting pull plate 604. The lifting pull plate 604 is rotatably connected to the limited push wheel 605 through the bearing. The left side of the inner surface of the side plate of the chain conveyor 2 is fixedly connected to the lifting pull plate 604 through the bracket. Lifting wheel rail 7, the right side of the inner surface of the side plate of chain conveyor 2 is fixedly connected to the limited locking rail 8 through the bracket; the conveying carrier 4 is driven by the chain conveyor 2 to pass through the spring heat treatment furnace body 1. During this process, the bottom limiting push wheel 605 of the conveying carrier 4 located on the left side of the spring heat treatment furnace body 1 is rollingly connected with the upper surface of the lifting wheel rail 7, and the limiting push wheel 605 is lifted upward by the lifting wheel rail 7, so that the vertical support plate 602 rises, and the gap between the vertical support plate 602 and the lower oblique support plate 501 is increased, which makes it easier to place the spring in the middle and make the effective coil part of the spring located on the lower oblique support plate 501. On the other hand, as the conveying carrier plate 4 continues to move to the right and enters the main body 1 of the spring heat treatment furnace, the limiting push wheel 605 disengages from the lifting wheel rail 7 and rolls with the arc end 801 of the locking rail, enters under the limiting locking rail 8 and rolls with it, and controls the limiting push wheel 605 to move down to the set height. At this time, the vertical support plate 602 contacts the top of the spring, so that the vertical oblique locking mouth 603 fits with the spring, and the spring is limited in three directions by the two lower oblique support plates 501 and the vertical support plate 602, limiting the degree of freedom of the spring, which can avoid deformation due to stress release and deadweight during the spring tempering process.
[0024] In the embodiment of the present disclosure, a vertical guide opening 402 is opened through the conveying carrier 4, and the vertical guide opening 402 is slidably connected to the vertical support rod of the spring lifting lock frame 6. The vertical support plate 602 is perpendicular to the upper surface of the conveying carrier 4 and plays a guiding role, so that the spring lifting lock frame 6 moves in a straight line, ensuring that the docking angle between the vertical support plate 602 and the spring remains unchanged.
[0025] In the embodiment of the present disclosure, the spacing between adjacent oblique limiting lock openings 502 in the same lower oblique support plate 501 is equal to the pitch of the processed spring in the natural state, and the oblique limiting lock opening 502 is in contact with the outer surface of the effective ring of the processed spring in the natural state. The oblique limiting lock opening 502 is an arc-shaped notch, and the opening edge of the oblique limiting lock opening 502 is chamfered. The angle between the left lower oblique support plate 501 and the right lower oblique support plate 501 is 120 degrees. The chamfered setting allows the spring to be placed above the lower oblique support plate 501. The spring coil can automatically slide into the oblique limiting lock opening 502 along with the chamfered structure, which is convenient for quick installation of the spring. The vertical oblique locking mouth 603 opens toward the bottom, and the opening edge of the vertical oblique locking mouth 603 is chamfered. The spacing between adjacent vertical oblique locking mouths 603 in the same vertical support plate 602 is equal to the pitch of the processed spring in its natural state. The vertical oblique locking mouth 603 fits the outer surface of the effective circle of the processed spring in its natural state. The oblique limiting locking mouths 502 in the two lower oblique support plates 501 and the vertical oblique locking mouths 603 in the vertical support plate 602 are all opened according to the spiral path of the spring, so that the pitch of the spring is restricted by the oblique limiting locking mouth 502 and the vertical oblique locking mouth 603 during the fixing process of the spring, thereby avoiding changes in the spring pitch during the heat treatment process.
[0026] Example 2, please refer to Figure 2The left end of the lifting wheel rail 701 is bent upward to form a locking rail arc end 801, and the locking rail arc end 801 is in an arc shape. The lower surface of the locking rail 8 is rollingly connected to the outer arc surface of the locking rail arc end 801, which is located above the chain conveyor 2. Through the setting of the locking rail arc end 801, the spring lifting lock frame 6 moves to the right with the conveying carrier 4. The limiting push wheel 605 is rollingly connected to the outer arc surface of the locking rail arc end 801 and gradually moves to the bottom of the limiting locking rail 8. The limiting lock rail 8 restricts the limiting push wheel 605, which facilitates the limiting push wheel 605 to roll smoothly into the bottom of the limiting locking rail 8, thereby realizing automatic positioning of the spring by the vertical support plate 602. When the heat treatment is completed, the right end of the chain conveyor 2 drives the conveying carrier 4 to flip, causing the spring lifting lock frame 6 to move under its own gravity, separating the vertical support plate 602 from the spring, and the spring falls under its own gravity, thereby realizing the function of automatic unloading of the spring.
[0027] The working principle of this embodiment: First, the spring heat treatment furnace body 1 and the chain conveyor 2 are turned on through the control panel 9, and the chain conveyor 2 drives the conveying carrier 4 to intermittently move to the right, and the spring is placed horizontally between the two lower oblique support plates 501 above the conveying carrier 4, so that the effective coil part of the spring automatically slides into the oblique limit lock 502, and the supporting ring of the spring extends out from the two ends of the lower oblique support plate 501, and fits with the upper surface of the spring placement base 5. As the conveying carrier 4 gradually moves to the right, the limit push wheel 605 is limited by the limit lock rail 8 and falls, so that the vertical oblique lock 603 is tightly fitted with the spring. At this time, each section of the effective coil part of the spring fits with the oblique limit lock 502 and the vertical oblique lock 603, and the oblique limit lock 502 and The vertical oblique lock 603 limits the pitch of the spring and prevents the spring from deforming during the tempering process by limiting the freedom of the spring; when the spring enters the spring heat treatment furnace body 1 under the transportation of the conveying carrier 4, the spring is heated by the high temperature inside the spring heat treatment furnace body 1. As the conveying carrier 4 moves intermittently, the spring is moved out through the right end outlet of the spring heat treatment furnace body 1 after completing the set heating time. At this time, the limiting push wheel 605 slides to the right end of the lifting wheel rail 7 and separates from it, and is no longer limited by the lifting wheel rail 7. When the conveying carrier 4 moves to the right end of the chain conveyor 2, as the conveying carrier 4 flips, the spring lifting lock frame 6 moves downward under its own gravity, releasing the lock on the spring, and causing the spring to automatically fall to complete unloading.
[0028] In this article, there are several points to note: 1. The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure. Other structures may refer to conventional designs.
[0029] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to form new embodiments.
[0030] The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.
Claims
1. A high stress valve spring heat treatment furnace, comprising: A spring heat treatment furnace body (1), wherein a chain plate conveyor (2) is installed at the bottom of the spring heat treatment furnace body (1), the upper conveying surface of the chain plate conveyor (2) passes horizontally through the inlet and outlet of the spring heat treatment furnace body (1), and a control panel (9) is installed in front of the chain plate conveyor (2), characterized in that a conveying carrier (4) is installed on the chain plate conveyor (2), and the conveying carrier (4) is penetrated by six rectangular hot air circulation through-holes (401), and the left and right sides of the hot air circulation through-holes (401) are respectively fixedly connected to a spring placing base (5), and the upper part of the spring placing base (5) is fixedly connected to a lower oblique support plate (501), and the upper edge of the lower oblique support plate (501) is provided with an oblique limit The transmission carrier (4) is movably connected to a spring lifting lock frame (6), and a lock frame connecting plate (601) is fixedly connected to the upper side of the spring lifting lock frame (6). The lower surface of the lock frame connecting plate (601) is connected to a vertical support plate (602), and a vertical oblique locking port (603) is provided on the lower edge of the vertical support plate (602). The front and rear ends of the lower side of the spring lifting lock frame (6) are respectively fixedly connected to a lifting pull plate (604), and the lifting pull plate (604) is rotatably connected to a limited push wheel (605) through a bearing. The left side of the inner surface of the side plate of the chain conveyor (2) is fixedly connected to a lifting wheel rail (7) through a bracket, and the right side of the inner surface of the side plate of the chain conveyor (2) is fixedly connected to a limited locking rail (8) through a bracket.
2. The high stress valve spring heat treatment furnace according to claim 1, characterized in that: The conveying carrier plate (4) is provided with a vertical guide opening (402) which is slidably connected to a vertical support rod of a spring lifting lock frame (6).
3. The high stress valve spring heat treatment furnace according to claim 1, characterized in that: The oblique limiting locking opening (502) is an arc-shaped notch, and the opening edge of the oblique limiting locking opening (502) is processed with a chamfer, and the angle between the left lower oblique supporting plate (501) and the right lower oblique supporting plate (501) is 120 degrees.
4. The high stress valve spring heat treatment furnace according to claim 3, characterized in that: The spacing between adjacent oblique limiting lock openings (502) in the same lower oblique support plate (501) is equal to the pitch of the processed spring in its natural state, and the oblique limiting lock openings (502) fit the outer surface of the effective ring of the processed spring in its natural state.
5. The high stress valve spring heat treatment furnace according to claim 1, characterized in that: The vertical support plate (602) is perpendicular to the upper surface of the conveying carrier plate (4), the vertical oblique locking opening (603) is opened toward the bottom, and the opening edge of the vertical oblique locking opening (603) is processed with a chamfer.
6. The high stress valve spring heat treatment furnace according to claim 5, characterized in that: The spacing between adjacent vertical oblique locking openings (603) in the same vertical support plate (602) is equal to the pitch of the processed spring in its natural state, and the vertical oblique locking openings (603) fit the outer surface of the effective ring of the processed spring in its natural state.
7. The high stress valve spring heat treatment furnace according to claim 1, characterized in that: The lifting wheel rail (7) is parallel to the upper surface of the chain conveyor (2), and the left end of the lifting wheel rail (7) is bent downward to form a lifting arc end (701).
8. The high stress valve spring heat treatment furnace according to claim 7, characterized in that: The lifting arc end (701) is in an arc-shaped structure, and the center of the lifting arc end (701) is located above the left driven shaft of the chain conveyor (2). The upper surface of the lifting wheel rail (7) and the outer arc surface of the lifting arc end (701) are rollingly connected to the limiting push wheel (605) located at the upper left position of the chain conveyor (2).
9. The high stress valve spring heat treatment furnace according to claim 1, characterized in that: The position-limiting locking rail (8) is parallel to the upper surface of the chain conveyor (2), and the left end of the position-limiting locking rail (8) is bent upward to form a locking rail arc end (801).
10. The high stress valve spring heat treatment furnace according to claim 8, characterized in that: The locking rail arc end (801) is in an arc-shaped structure, and the lower surface of the limiting locking rail (8) and the outer arc surface of the locking rail arc end (801) are rollingly connected to the limiting push wheel (605) located above the chain conveyor (2).