A continuous automatic correction jig for precision fastener heat treatment oven

Abstract

The utility model discloses a kind of continuous automatic correction jigs for precision fastener heat treatment baking tray, it is installed in the network band both sides of heat treatment continuous furnace discharge port rear, it include: preliminary correction module and accurate positioning module on the network band, preliminary correction module is located on base, accurate positioning module is located in the rear of preliminary correction module and is installed on base.The network band carries heat treated baking tray and moves under the movement of network band, network band is sleeved on roller, roller rotation drives baking tray on network band to pass preliminary correction module, accurate positioning module in turn.By preliminary correction and accurate positioning two-section jig design, eliminate the problem such as clamp jaw material taking failure, network band blockage, baking tray collision caused by baking tray misplacement, ensure the continuous, stable, efficient operation of production line, fundamentally reduce the scrappage of precision fastener, improve product yield.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary equipment for heat treatment production lines, specifically to a fixture for automatically correcting and positioning a baking tray carrying precision fasteners during continuous heat treatment. Background Technology

[0002] In the heat treatment process of precision fasteners (such as M0.8 to M1.0 screws), due to the small size and light weight of the workpieces, they must be placed in a special baking tray fixture, and then gripped by mechanical jaws and regularly placed on the mesh belt of a continuous heat treatment furnace for heating, heat preservation and cooling in sequence.

[0003] However, existing technologies have significant drawbacks: the inlet and outlet of continuous heat treatment furnaces are typically equipped with slopes and fire curtain devices, causing vibrations in the conveyor belt during operation. This makes it easy for lightweight baking trays to skew, misalign, and shift irregularly when passing through these areas. Displaced trays prevent subsequent grippers from accurately picking them up, severely impacting production efficiency. Even more seriously, unremoved trays can obstruct the continuous operation of the conveyor belt, causing them to collide and resulting in the failure of precision fasteners within the trays.

[0004] Currently, each shift on the production line requires 1-2 workers specifically assigned to manually straighten and place the baking trays. This method not only increases labor costs and management difficulty, but also results in inconsistent straightening effects, relying on the workers' attention and skill level, and cannot fundamentally guarantee the stability of production quality and the continuity of equipment operation. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a continuous automatic straightening fixture for heat treatment baking trays of precision fasteners. This fixture can continuously and accurately straighten irregularly offset baking trays on the conveyor belt after heat treatment, reduce manual intervention, improve production efficiency, reduce scrap rate, and ensure stable equipment operation.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners, installed on both sides of a conveyor belt behind the outlet of a continuous heat treatment furnace, comprising: The preliminary correction module located on the base includes a first fixture plate and a second fixture plate symmetrically arranged on both sides of the mesh belt. The first fixture plate and the second fixture plate form a first correction channel. The entrance ends of the first fixture plate and the second fixture plate are provided with a first guide chamfer. The first fixture plate and the second fixture plate are respectively fixedly installed on the fixed support plate by screws. A precision positioning module is located behind the preliminary correction module and mounted on the base; the precision positioning module includes a third fixture plate and a fourth fixture plate symmetrically arranged on both sides of the mesh belt, the third fixture plate and the fourth fixture plate forming a second correction channel, the third fixture plate and the fourth fixture plate being connected by a stop plate, and the entrance ends of the third fixture plate and the fourth fixture plate being provided with a second guide chamfer; The mesh belt carries the heat-treated baking tray and moves under the movement of the mesh belt. The mesh belt is sleeved on the rollers, and the rotation of the rollers drives the baking tray on the mesh belt to pass through the preliminary correction module and the precise positioning module in sequence.

[0007] Preferably, the inner sides of the first fixture plate and the second fixture plate are respectively provided with fixing grooves, so that the two sides of the mesh belt can be slidably locked in the first fixture plate and the second fixture plate respectively; The depth of the fixing groove is 3mm.

[0008] Preferably, the fixed support plate is located on the base, and the fixed support plate includes a first support plate and a second support plate. The first support plate carries the first fixture plate, and the second support plate carries the second fixture plate.

[0009] Preferably, the angle of the first guide chamfer is 160°.

[0010] Preferably, a transition angle is provided at the exit end of the first fixture plate and the second fixture plate. The transition angle is located behind the first guide chamfer and is connected to the first guide chamfer.

[0011] Preferably, the third fixture plate and the fourth fixture plate are located on the bracket via stop plates and are mounted on the base via the bracket.

[0012] Preferably, the second guide chamfer includes a first chamfer and a second chamfer, wherein the angle of the first chamfer and the majority of the second chamfers is 25°.

[0013] Preferably, the surfaces of the first guide chamfer and the second guide chamfer are both mirror-polished surfaces; Preferably, it also includes a sensing material handling module, which includes a photoelectric switch sensor for sensing the position of the baking tray and a through-beam photoelectric sensor; The through-beam photoelectric sensor is mounted on the bracket, and the photoelectric switch sensor is mounted on the stop plate.

[0014] The beneficial effects of this utility model are: (1) This utility model provides a continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners. Through the design of a two-stage fixture for preliminary straightening and precise positioning, the preliminary straightening module and the precise positioning module are located on the conveyor belt respectively. The precise positioning module is located after the preliminary straightening module. The baking tray after passing through the preliminary straightening module is from "large deviation" to "small deviation". Then, after passing through the precise positioning module, the "small deviation" is improved to "precise positioning". This solves the problems of skewing, misalignment and irregular left and right offset of the baking tray during the operation of the conveyor belt after heat treatment, as well as the problem that the clamp cannot accurately grasp the baking tray due to offset and misalignment, or the baking tray that is not removed hinders the continuous operation of the conveyor belt, causing the baking trays to collide with each other and the precision fasteners in the tray to be scrapped.

[0015] (2) This utility model provides a continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners. The first fixture plate and the second fixture plate form a first straightening channel, and a first guide chamfer of 160° is provided at the entrance end of the first fixture plate and the second fixture plate. The third fixture plate and the fourth fixture plate form a second straightening channel, and a second guide chamfer of 25° is provided at the entrance end of the third fixture plate and the fourth fixture plate. The large angle chamfer of 160° is used to initially gather the baking tray with a large offset, and the small angle chamfer of 25° is used for further precise positioning. The two-stage straightening ensures that the baking tray can accurately return to the center of the mesh belt and fit with the fixture. The positioning accuracy is high, and the precise positioning is achieved, providing reliable conditions for subsequent gripper gripping.

[0016] (3) This utility model provides a continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners. The surfaces of the first guide chamfer and the second guide chamfer are both mirror polished, which greatly reduces the frictional resistance and wear between the baking tray and the fixture, ensuring the smoothness of the straightening process and extending the service life of the fixture. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners according to this utility model. Figure 2 This is a schematic diagram from another angle of a continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners. Figure 3 This is a partial schematic diagram of a continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners. The components in the attached diagram are labeled as follows: 1. First fixture plate; 2. Second fixture plate; 3. First guide chamfer; 4. Transition angle; 5. Third fixture plate; 6. Fourth fixture plate; 7. First support plate; 8. Second support plate; 9. First chamfer; 10. Second chamfer; 11. Stop plate; 12. Bracket; 13. Base; 14. Through-beam photoelectric sensor; 15. Photoelectric switch sensor; 16. Roller; 17. Mesh belt. Detailed Implementation

[0018] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0019] Example: This embodiment describes the structure of a continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners.

[0020] For reference Figure 1 , 2 As shown in Figure 3, Figure 1 This is a schematic diagram of the structure of a continuous automatic straightening fixture for a heat treatment baking tray of precision fasteners according to this utility model. Figure 2 This is another schematic diagram of a continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners. Figure 3 This is a partial schematic diagram of a continuous automatic straightening fixture for a precision fastener heat treatment baking tray. The fixture is installed on both sides of a conveyor belt behind the outlet of a continuous heat treatment furnace. Specifically, it includes a preliminary straightening module and a precision positioning module located on the conveyor belt. The preliminary straightening module is located on a base 13, and the precision positioning module is located behind the preliminary straightening module and installed on the base 13. The conveyor belt 17 carries the heat-treated baking tray and moves under its movement. The conveyor belt sleeve 17 is mounted on rollers 16. The rotation of the rollers 16 causes the baking tray on the conveyor belt 17 to sequentially pass through the preliminary straightening module and the precision positioning module.

[0021] The function of the preliminary correction module is to perform the first coarse adjustment on the baking trays that have become severely and disorderly displaced after passing through the heat treatment furnace, so as to quickly and efficiently bring them back to the vicinity of the center area of ​​the conveyor belt from a state of large misalignment, thus preparing for the subsequent precise positioning module.

[0022] The function of the precision positioning module is to receive the baking pan, which has been roughly centered after initial correction, and to perform final fine-tuning and precision positioning on it to ensure that the baking pan and the fixture are completely in contact, so as to achieve the precise position and stable posture required for gripping by the grippers, and to trigger the sensing system to issue a gripping command.

[0023] The preliminary correction module includes a first jig plate 1 and a second jig plate 2 symmetrically arranged on both sides of the mesh belt 17. The first jig plate 1 and the second jig plate 2 form a first correction channel on the mesh belt 17. The first jig plate 1 and the second jig plate 2 are respectively fixedly installed on the fixed support plate by screws. The fixed support plate is located on the base 13. The fixed support plate includes a first support plate 7 and a second support plate 8. The first support plate 7 carries the first jig plate 1, and the second support plate 8 carries the second jig plate 2.

[0024] The inner sides of the first fixture plate 1 and the second fixture plate 2 are respectively provided with fixing grooves, which allow the two sides of the mesh belt 17 to slide and be respectively engaged in the first fixture plate and the second fixture plate. In a preferred embodiment, the fixing grooves are 3mm deep. During installation, it is ensured that the fixing grooves on the two fixture plates are engaged on both sides of the mesh belt, so that the position of the mesh belt is limited, while not affecting the movement of the mesh belt. The movement of the mesh belt relies on rollers. The entire operating structure of the mesh belt is not shown in the figure, but this technology is clear to those skilled in the art, and therefore will not be described in detail in this utility model.

[0025] In a preferred embodiment, the inlet ends of the first fixture plate 1 and the second fixture plate 2 are provided with a first guide chamfer 3. The angle of the first guide chamfer is 160°, making the inlet end of the correction channel form a "trumpet" shape. When the baking tray just comes out of the heat treatment furnace, its offset is irregular and may be large, some even close to the edge of the conveyor belt. The 160° large-angle guide chamfer forms a "trumpet" shaped guide channel. This angle provides a sufficiently long guide ramp. Even if the offset of the baking tray is large, it can be pushed along this long ramp by the forward force of the conveyor belt after contacting the first guide chamfer, thus being "caught" and guided to the center area of ​​the conveyor belt, achieving efficient guidance. Moreover, the angle of 160° selected for the first guide chamfer in this preferred embodiment is a relatively gentle angle, which makes the initial correction process a gradual and flexible process, avoiding sudden collisions, jamming or flipping caused by too small an angle, which is very suitable for handling the chaotic initial state of the baking tray.

[0026] In a preferred embodiment, the surface of the first guide chamfer is also mirror-polished. The first guide chamfer surface is a mirror-polished surface. This greatly reduces the coefficient of friction when the baking tray comes into contact with the preliminary straightening fixture, ensuring that the baking tray can slide smoothly along the slope instead of being stuck or causing huge wear, thereby ensuring the reliability of automatic straightening.

[0027] A transition angle 4 is also provided at the exit end of the first fixture plate 1 and the second fixture plate 2. The transition angle 4 is located behind the first guide chamfer 3 and is connected to the first guide chamfer 3. The purpose of the transition angle is to assist the baking tray after passing through the first guide chamfer to continue fine adjustment and steadily move out of the preliminary correction module and into the subsequent precision determination module.

[0028] In this invention, the preliminary correction module, with its large angle and low friction design, transforms the baking pan from "disordered" to "ordered" and "large deviation" to "small deviation," in order to facilitate more precise subsequent adjustments.

[0029] The precise positioning module includes a third fixture plate 5 and a fourth fixture plate 6 symmetrically arranged on both sides of the mesh belt 17. The third fixture plate 5 and the fourth fixture plate 6 are connected by a stop plate 11. The third fixture plate and the fourth fixture plate form a second correction channel on the mesh belt. The third fixture plate 5 and the fourth fixture plate 6 are located on the bracket 12 through the stop plate 11 and are mounted on the base 13 through the bracket 12.

[0030] In a preferred embodiment, the inlet ends of the third fixture plate 5 and the fourth fixture plate 6 are provided with a second guide chamfer. After passing through the preliminary correction module, the baking tray is in the center area of ​​the conveyor belt, but there may still be slight angular deviations or positional errors. To eliminate this situation and improve the accuracy of the baking tray's positioning, the second guide chamfer is used to achieve a slight and precise positioning adjustment of the baking tray after passing through the preliminary correction module.

[0031] In a preferred embodiment, the second guide chamfer includes a first chamfer 9 and a second chamfer 10, with the angles of the first chamfer 9 and the majority of the second chamfers 10 being 25°. The second guide chamfer is designed as a small 25° chamfer, providing a steeper and more precise guide slope for the surface of the correction channel formed by the third fixture plate and the fourth fixture plate. This small angle allows any slight offset to come into contact with the chamfered slope, gradually bringing the baking tray into contact with the fixture plate. Under the action of the conveyor belt's forward force, the tray is forcibly and gently "pushed" to the stop plate position, achieving precise adjustment and positioning of the baking tray's offset position.

[0032] In a preferred embodiment, the surface of the second guide chamfer is also a mirror-polished surface that has undergone mirror polishing treatment, reducing the friction between the baking tray and the fixture contact surface.

[0033] This precise positioning module not only centers the pre-corrected baking tray, but also ensures that its edges are perfectly parallel and tightly fitted to the inner wall of the fixture plate. This close fit eliminates deviations in all degrees of freedom, providing a highly repeatable and stable physical reference for subsequent gripper grasping. After being adjusted by the precise positioning module, the baking tray is precisely positioned to the stop plate by the conveyor belt. The accurate and consistent positioning facilitates repeated gripping by the gripper, eliminating the need for positioning each time, greatly reducing operational difficulty and improving efficiency.

[0034] The fixture also includes a sensing and material handling module, which comprises a photoelectric switch sensor 15 and a through-beam photoelectric sensor 14 for sensing the position of the baking tray. The photoelectric switch sensor 15 is mounted on the stop plate 11, and the through-beam photoelectric sensor 14 is mounted on the bracket 12. In use, when the aligned baking tray passes the photoelectric switch sensor and the through-beam photoelectric sensor, the light is blocked, and the sensor sends a signal to the control system. The control system then instructs the gripper to accurately pick up the baking tray, completing the automatic unloading process.

[0035] The photoelectric sensor needs to detect a highly consistent position signal. Only when the baking tray is consistently positioned in the exact same location can the sensor be reliably blocked, thus emitting an accurate "in place" signal. The precision positioning module designed in this invention ensures that the position where the baking tray stops after each correction is unique and accurate, making the timing control of the photoelectric sensor triggering and subsequent gripper grasping highly precise and reliable. The movement trajectory of the gripper is generally fixed. This precision positioning module ensures that the baking tray always appears at the gripper's preset gripping point, thereby improving the gripping success rate and avoiding gripping failures, collisions, or drops due to inaccurate positioning. This enhances the continuity of the production line and product yield, and increases the automation level of gripper grasping after the baking tray is corrected. This invention does not protect the control system and gripper technologies, therefore they are not described in detail. However, those skilled in the art will readily understand and apply them to this invention.

[0036] In this invention, the precision positioning module, with its small angle and high precision design, improves the "small deviation" after the initial correction module to "precise positioning", ensuring that the position of the baking tray on the conveyor belt is precisely adjusted before each gripping and that the position remains consistent, so that the grippers can repeatedly and quickly grip, greatly improving production efficiency.

[0037] Working Principle: The baking tray carrying the workpiece moves with the conveyor belt. After passing the outlet of the heat treatment furnace, the baking tray, which has shifted, first passes through the correction channel formed by the first and second fixture plates. Under the action of the forward force of the conveyor belt, the baking tray moves along the inclined surface of the first guide chamfer, and is gradually guided and gathered to the center position of the conveyor belt, completing the initial correction. Subsequently, the baking tray continues to move forward under the power of the conveyor belt, entering the correction channel formed by the third and fourth fixture plates. It contacts the second guide chamfer and continues to move along the inclined surface of the second guide chamfer. This chamfer section fine-tunes the baking tray, making the edge of the baking tray completely fit with the fixture plate, achieving precise positioning. Finally, it reaches the stop plate. When the corrected baking tray passes the photoelectric sensor, the light is blocked, and the sensor sends a signal to the control system. The control system then instructs the gripper to accurately grab the baking tray, completing the automatic unloading process.

[0038] This utility model features an ingenious design and simple structure. Through a two-stage fixture design consisting of a preliminary correction module and a precise positioning module, it enhances the automation and accuracy of baking tray correction on the conveyor belt. It solves the problems of skewing, misalignment, and irregular lateral displacement of lightweight baking trays caused by conveyor belt vibration during operation. It also eliminates problems such as gripper failure, conveyor belt blockage, and baking tray collisions caused by baking tray misalignment, ensuring continuous, stable, and efficient production line operation. This fundamentally reduces the scrap of precision fasteners and improves product yield. Adding this fixture structure to existing conveyor belt equipment does not increase production costs due to its simple structure, but it significantly reduces labor costs, eliminating the need for at least two people to correct the baking trays manually, greatly improving production efficiency and ensuring product quality.

[0039] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners, installed on both sides of a conveyor belt behind the discharge port of a continuous heat treatment furnace, characterized in that, include: The preliminary correction module located on the base (13) includes a first jig plate (1) and a second jig plate (2) symmetrically arranged on both sides of the mesh belt (17). The first jig plate (1) and the second jig plate (2) form a first correction channel. The entrance ends of the first jig plate (1) and the second jig plate (2) are provided with a first guide chamfer (3). The first jig plate (1) and the second jig plate (2) are respectively fixedly installed on the fixed support plate by screws. A precision positioning module is located behind the preliminary correction module and installed on the base (13); the precision positioning module includes a third fixture plate (5) and a fourth fixture plate (6) symmetrically arranged on both sides of the mesh belt (17), the third fixture plate (5) and the fourth fixture plate (6) forming a second correction channel; the third fixture plate (5) and the fourth fixture plate (6) are connected by a stop plate, and the entrance ends of the third fixture plate (5) and the fourth fixture plate (6) are provided with a second guide chamfer; The mesh belt (17) carries the heat-treated baking tray and moves under the movement of the mesh belt (17). The mesh belt (17) is sleeved on the roller (16). The rotation of the roller (16) drives the baking tray on the mesh belt (17) to pass through the preliminary correction module and the precise positioning module in sequence.

2. The continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners according to claim 1, characterized in that: The inner sides of the first fixture plate (1) and the second fixture plate (2) are respectively provided with fixing grooves, so that the two sides of the mesh belt (17) can be slidably locked in the first fixture plate and the second fixture plate respectively; The depth of the fixing groove is 3mm.

3. A continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners according to claim 1, characterized in that: The fixed support plate is located on the base (13). The fixed support plate includes a first support plate (7) and a second support plate (8). The first support plate (7) carries the first fixture plate (1), and the second support plate (8) carries the second fixture plate (2).

4. A continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners according to claim 1, characterized in that: The angle of the first guide chamfer (3) is 160°.

5. A continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners according to claim 1, characterized in that: A transition angle (4) is provided at the exit end of the first fixture plate (1) and the second fixture plate (2). The transition angle (4) is located behind the first guide chamfer (3) and is connected to the first guide chamfer (3).

6. A continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners according to claim 1, characterized in that: The third fixture plate (5) and the fourth fixture plate (6) are located on the bracket (12) via the stop plate (11) and are mounted on the base (13) via the bracket (12).

7. A continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners according to claim 1, characterized in that: The second guide chamfer includes a first chamfer (9) and a second chamfer (10), the angles of the first chamfer (9) and the majority of the second chamfers (10) are both 25°.

8. A continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners according to claim 1, characterized in that: The surfaces of the first guide chamfer (3) and the second guide chamfer are both mirror-polished surfaces.

9. A continuous automatic straightening fixture for a heat treatment baking tray for precision fasteners according to claim 6, characterized in that: It also includes a sensing material picking module, which includes a photoelectric switch sensor (15) for sensing the position of the baking tray and a through-beam photoelectric sensor (14). The through-beam photoelectric sensor (14) is mounted on the bracket (12), and the photoelectric switch sensor (15) is mounted on the stop plate (11).

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