A quenching device for fastener production

Abstract

The present application relates to fastener quenching technical field, specifically disclose a kind of quenching device for fastener production, including quenching pool and obliquely arranged conveying device, multiple net-shaped placing cylinders are installed on conveying device with interval, net-shaped placing cylinder includes net-shaped cylinder body, movable cylinder cover and locking assembly, movable cylinder cover is locked by locking assembly after closure, to prevent net-shaped placing cylinder from opening after entering quenching pool due to fastener overturning;Dial lever is rotatably arranged in net-shaped placing cylinder, multiple oblique paddles are arranged on dial lever, driving end of dial lever and fixed rack are provided with push assembly, push assembly drives dial lever reciprocating rotation when net-shaped placing cylinder passes through immersion section, so that oblique paddle overturns fastener and disturbs quenching medium.Net-shaped placing cylinder is knocked by knocking assembly after liquid outlet, and then movable cylinder cover is opened to take out fastener.

Description

Technical Field

[0001] This invention relates to the field of fastener heat treatment equipment technology, and specifically to a quenching device for fastener production. Background Technology

[0002] Fasteners typically include bolts, nuts, screws, pins, washers, and other parts, and are used extensively in mechanical assembly, vehicle manufacturing, building connections, and equipment installation. To achieve the required hardness, strength, and wear resistance, some fasteners require quenching after cold heading, machining, cleaning, or preheating. Due to their small size and large batch size, fasteners are usually placed in a basket, mesh cylinder, material frame, or other holding structure during production. The holding structure is then transported to quenching oil, salt bath, or other quenching media via a conveying, hoisting, or rotating mechanism. While this method increases the throughput per batch, it also causes fasteners to stack within the holding structure, particularly bolt heads, nut end faces, threaded sections, and hole cavities, making it difficult for the quenching medium to stably penetrate into localized gaps.

[0003] Chinese patent application CN115198068A discloses a quenching device for high-strength fasteners, comprising an outer shell filled with a salt bath solution at its bottom. The outer shell contains a holding structure, baffles, spray heads, a track, and a drive structure. The holding structure carries the fasteners within the outer shell, and the fasteners undergo heat treatment through the combined action of steam, spray, and the salt bath solution. While this application enables continuous conveying and cooling of fasteners, its focus is on the quenching environment and the coordination of spray and salt bath solutions. Localized stacking of fasteners within the holding structure is primarily mitigated by the overall movement of the holding structure and the flow of the medium.

[0004] In actual production, after fasteners enter the quenching medium, if the container structure lacks a direct turning mechanism, although the quenching medium can enter the container space through the mesh, the contact area between the fasteners will still be blocked, resulting in a slow quenching medium turnover rate and uneven local cooling, which can easily affect the heat treatment consistency of the same batch of fasteners. Therefore, it is necessary to provide a quenching device for fastener production that can directly turn over the fasteners during continuous conveying and quenching. Summary of the Invention

[0005] This invention provides a quenching device for fastener production, which aims to solve the problem in related technologies that fasteners tend to stack and stick together when quenching in a concentrated manner, thus affecting the consistency of heat treatment of fasteners in the same batch.

[0006] A quenching apparatus for fastener production includes a quenching tank and a conveying device inclined and partially located within the quenching tank. The conveying device includes a fixed frame and an annular conveyor that circulates relative to the fixed frame. Multiple mesh placement cylinders are spaced apart along the conveying direction on the annular conveyor. The mesh placement cylinders are used to hold fasteners to be quenched and have an openable and lockable cylindrical structure. A lever is rotatably mounted inside each mesh placement cylinder. Multiple inclined paddles are spaced apart along the length of the lever. One end of the lever extends out of the mesh placement cylinder and forms a driving end. A pushing assembly is provided between the driving end and the fixed frame. The pushing assembly is used to drive the lever to reciprocate relative to the mesh placement cylinder as the mesh placement cylinder passes through the immersion section of the quenching tank with the annular conveyor.

[0007] Its effects are as follows: the mesh placement cylinder is used to centrally hold fasteners to be quenched, and the annular conveyor drives multiple mesh placement cylinders to continuously enter and leave the quenching tank, thus adapting to batch continuous production. After the mesh placement cylinder enters the quenching medium, the quenching medium can enter the interior of the mesh placement cylinder through the mesh holes in the cylinder wall and come into contact with the fasteners. The pushing component uses the movement of the mesh placement cylinder relative to the fixed frame to drive the rotating lever, causing the inclined vanes on the lever to swing or rotate inside the mesh placement cylinder. When the inclined vanes pass through the fastener accumulation area, they disperse, lift, and flip the fasteners, causing the position of the fasteners that are in contact with each other to change, reducing end face contact, thread contact, and cavity obstruction; at the same time, when the inclined vanes rotate, they will push the quenching medium in the cylinder to form a local flow, allowing new quenching medium to enter the gaps that were originally blocked, improving the cooling uniformity of the fasteners in the same cylinder. The mesh placement cylinder is designed with an openable and lockable structure, allowing it to be opened in the feeding section to load fasteners, and locked before entering the quenching tank to prevent the cylinder cover from opening due to the rotation of the paddle and the flipping of the fasteners; after quenching is completed and the cylinder leaves the quenching tank, it can be opened again to remove the fasteners.

[0008] Preferably, the conveying device further includes a drive wheel set and a driven wheel set rotatably mounted on a fixed frame. An annular conveying component is wound between the drive wheel set and the driven wheel set. The drive wheel set is connected to a drive motor. The annular conveying component includes two parallel conveying chains with multiple mounting arms between the two conveying chains. The two ends of the mesh placement cylinder are respectively connected to the corresponding mounting arms. A stable circulating conveying structure is formed by the drive wheel set, the driven wheel set, and the two conveying chains. The two ends of the mesh placement cylinder are supported by the mounting arms, which can reduce the shaking of the placement cylinder during immersion and discharge processes, and enable the drive end structure such as gears and abutment rods to stably cooperate with the triggering structure on the fixed frame.

[0009] Preferably, the mesh placement cylinder includes a mesh cylinder body, end plates fixed at both ends of the mesh cylinder body, a movable cylinder cover, and a locking assembly. The mesh cylinder body has a loading / unloading port on its side, and the movable cylinder cover covers the loading / unloading port. One side of the movable cylinder cover is hinged to the mesh cylinder body via a hinge shaft, and the other side of the movable cylinder cover is locked to the mesh cylinder body via the locking assembly. With this configuration, fasteners can be loaded into the mesh placement cylinder through the loading / unloading port in the feeding section. After loading is completed, the movable cylinder cover covers the loading / unloading port and locks it with the locking assembly, keeping the mesh cylinder body closed after entering the quenching tank. After unlocking in the discharging section, the movable cylinder cover can be opened around the hinge shaft, allowing the operator to remove the quenched fasteners.

[0010] Preferably, the locking assembly includes a lock seat fixed to the mesh cylinder, a lock tongue slidably installed in the lock seat, a lock groove provided on the movable cylinder cover, and a compression spring that applies an elastic force to the lock tongue in the direction of the lock groove. When the lock tongue is inserted into the lock groove, it restricts the movable cylinder cover from opening relative to the mesh cylinder. By forming an insertion limit between the lock tongue and the lock groove, when the movable cylinder cover is impacted by the internal fasteners, the impact force is borne jointly by the lock groove wall and the lock tongue, preventing the movable cylinder cover from directly detaching from the mesh cylinder. The compression spring keeps the lock tongue in the inserted lock groove state, reducing the possibility of locking loosening due to conveying vibration, quenching liquid impact, or paddle disturbance.

[0011] Preferably, the locking tongue is connected to an unlocking lever located on the outside of the mesh placement cylinder. The unlocking lever is used to drive the locking tongue out of the locking groove. An opening handle is provided on the outside of the movable cylinder cover. The unlocking lever and the opening handle are arranged adjacent to each other. After the mesh placement cylinder comes out of the quenching tank and reaches the discharge section, the operator first pulls the unlocking lever to make the locking tongue out of the locking groove, and then holds the opening handle to open the movable cylinder cover, so that the quenched fasteners can be taken out from the mesh cylinder. The adjacent arrangement of the unlocking lever and the opening handle can make the unlocking and opening actions complete continuously, improving the convenience of the discharge operation.

[0012] Preferably, the locking groove has a snap-fit ​​sidewall for abutting against the locking tongue. When the movable cylinder cover is subjected to the thrust generated by the fasteners or inclined paddle inside the mesh placement cylinder, the locking tongue abuts against the snap-fit ​​sidewall to prevent the movable cylinder cover from opening in the quenching tank. This structure ensures that when the movable cylinder cover is subjected to an outward pushing force, the locking tongue will not move in the direction of exiting the locking groove, but will form a mechanical abutment with the snap-fit ​​sidewall of the locking groove, thereby improving the ability of the mesh placement cylinder to prevent accidental opening during the immersion and paddle process.

[0013] Preferably, the end plate or mesh cylinder is provided with a supporting boss, and the movable cylinder cover is provided with a limiting lug. After the movable cylinder cover is opened, the limiting lug abuts against the supporting boss, keeping the movable cylinder cover in the open state. With this setting, the movable cylinder cover will not fall back due to its own weight during material discharge, nor will it interfere with the operator's removal of fasteners, making it convenient to pour out, clamp out, or pull out the fasteners inside the mesh cylinder.

[0014] Preferably, a reset element is provided between the actuating rod and the end plate. The reset element is a torsion spring sleeved on the actuating rod, with one end of the torsion spring connected to the end plate and the other end connected to the actuating rod. The inclined paddle includes a connecting side fixedly connected to the actuating rod and a feeding side away from the actuating rod. A clearance gap is left between the feeding side and the inner wall of the mesh cylinder. The inclination directions of two adjacent inclined paddles are opposite. A flow hole is provided on the inclined paddle for the quenching medium to pass through. The reset element causes the actuating rod to automatically return to its original position after being driven by the pushing component, forming a reciprocating towing action, preventing the fastener from being continuously pushed to the same side. After the adjacent paddles are in opposite inclination directions, the fasteners at different positions can be loosened in different directions. The flow hole reduces the resistance of the paddle in the quenching medium and allows the medium to pass through the paddle and continue to flush the fastener.

[0015] Preferably, the pushing assembly includes a gear fixedly connected to the driving end of the actuating rod and a rack assembly fixedly mounted on a fixed frame. The rack assembly includes a first rack and a second rack, both located in the corresponding areas of the immersion section of the quenching tank. The first and second racks are staggered along the conveying direction of the annular conveyor. When the gear moves with the mesh placement cylinder and meshes with the first rack, it drives the actuating rod to rotate in a first direction. When the gear moves with the mesh placement cylinder and meshes with the second rack, it drives the actuating rod to rotate in a second direction. The engagement of the gear and rack converts the conveying motion of the mesh placement cylinder into the rotational motion of the actuating rod. The first and second racks correspond to different directions, allowing the actuating rod to perform alternating forward and reverse actuation during the immersion process.

[0016] Preferably, a striking assembly is provided on the quenching tank above the quenching medium surface. The striking assembly is located below the discharge section of the conveying device. A trigger protrusion is provided on the outer side of the mesh placement cylinder. The striking assembly includes a striking arm rotatably mounted on the quenching tank, an elastic return member disposed between the striking arm and the quenching tank, and a striking head disposed at the end of the striking arm. When the trigger protrusion moves with the mesh placement cylinder, it pushes the striking arm to deflect. After the trigger protrusion passes the striking arm, the elastic return member drives the striking arm to reset, causing the striking head to strike the mesh placement cylinder. After the mesh placement cylinder leaves the quenching medium, the striking assembly generates a short vibration on the cylinder, shaking off the quenching medium adhering to the mesh, fastener threads, cavities, and stacking gaps, reducing the amount of quenching medium carried out.

[0017] By adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. By setting a lever and multiple tilting paddles inside the mesh placement cylinder, the fasteners are directly turned over after entering the quenching medium, reducing the continuous contact between the fasteners and making it easier for the quenching medium to enter the gaps between the fasteners, thereby improving the uniformity of quenching and cooling of the same batch of fasteners.

[0018] 2. The mesh placement cylinder is opened and closed by a movable cylinder cover and locked by a locking component. This makes it easy to load materials into the mesh placement cylinder in the feeding section, prevents the movable cylinder cover from being accidentally opened due to the rotation of the paddle and the flipping of the fasteners in the quenching tank, and allows the fasteners to be removed in the discharging section. This balances the convenience of loading, the safety of quenching, and the convenience of discharging.

[0019] 3. The push component is set between the drive end of the toggle lever and the fixed frame. It uses the relative motion generated by the movement of the mesh placement cylinder with the conveying device to drive the toggle lever. There is no need to set a separate power source for each placement cylinder. The structure is simple and suitable for use in continuous quenching production lines.

[0020] 4. The striking component can cause the quenching medium to fall back into the quenching pool after the quenching medium is discharged from the mesh placement cylinder, reducing the amount of quenching medium carried out and reducing pollution in the subsequent transportation area. Attached Figure Description

[0021] Figure 1 This is a front view schematic diagram of the present invention.

[0022] Figure 2 This is a schematic diagram of the conveying device and quenching tank of the present invention.

[0023] Figure 3 This is a schematic diagram of the structure of the mesh cylinder and the movable cover plate of the present invention.

[0024] Figure 4 This is a schematic diagram of the toggle lever and tilting paddle of the present invention.

[0025] Figure 5 This is a schematic diagram of the structure of the movable cover plate of the present invention.

[0026] Figure 6 This is a schematic diagram of the structure after the movable cover plate of the present invention is opened.

[0027] Figure 7 This is a schematic diagram of the structure of the driving component of the present invention.

[0028] Figure 8 This is a schematic diagram of the structure of the striking component of the present invention.

[0029] Figure label: 1. Quenching pool; 11. Inlet side; 12. Outlet side; 2. Conveying device; 21. Fixed frame; 22. Drive wheel assembly; 23. Driven wheel assembly; 3. Mesh placement cylinder; 31. Mesh cylinder body; 32. End plate; 33. Movable cylinder cover; 34. Trigger protrusion; 36. Locking assembly; 361. Lock seat; 362. Lock tongue; 363. Lock groove; 364. Compression spring; 365. Unlocking lever; 366. Opening handle; 37. Hinge shaft; 38. Limiting lug; 39. Supporting boss; 4. Actuating rod; 41. Inclined lever; 411. Flow hole; 5. Pushing assembly; 51. Gear; 52. First rack; 53. Second rack; 6. Reset component; 7. Striking assembly; 71. Striking arm; 72. Elastic return component; 73. Striking head. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] like Figures 1-8 As shown, a quenching device for fastener production includes a quenching tank 1, a conveying device 2, multiple mesh placement cylinders 3, a lever 4, a pushing assembly 5, a resetting component 6, and a striking assembly 7. The quenching tank 1 contains a quenching medium, which is quenching oil. The quenching tank 1 has an inlet side 11 and an outlet side 12 along the conveying direction. The conveying device 2 is installed at an angle above the quenching tank 1. One section of the conveying device 2 enters the quenching tank 1 downwards to form an immersion section, and the other section extends upwards to form an outlet section. Multiple mesh placement cylinders 3 are arranged at intervals along the conveying direction of the conveying device 2, and each mesh placement cylinder 3 contains a batch of fasteners to be quenched. After the mesh placement cylinder 3 enters the quenching medium along with the conveying device 2, the pushing component 5 pushes the actuating rod 4 to rotate. The actuating rod 4 drives the tilting plate 41 to move the fasteners and disturb the quenching oil. After the mesh placement cylinder 3 leaves the quenching oil, the striking component 7 strikes the mesh placement cylinder 3 to make the attached quenching oil fall back. Then the mesh placement cylinder 3 is opened in the discharge section, and the operator takes out the quenched fasteners.

[0032] The conveying device 2 includes a fixed frame 21, a drive wheel assembly 22, a driven wheel assembly 23, and an annular conveyor. The drive wheel assembly 22 and the driven wheel assembly 23 are rotatably mounted at both ends of the fixed frame 21, and the annular conveyor is wound between the drive wheel assembly 22 and the driven wheel assembly 23. The drive wheel assembly 22 is connected to an external drive motor, which drives the annular conveyor to move cyclically through the drive wheel assembly 22. The annular conveyor consists of two parallel conveyor chains with multiple mounting arms between them. The two ends of the mesh placement cylinder 3 are respectively mounted on the corresponding mounting arms, enabling the mesh placement cylinder 3 to move stably with the annular conveyor. The fixed frame 21 is inclined, allowing the mesh placement cylinder 3 to gradually enter the quenching oil from outside the quenching tank 1 and gradually leave the quenching oil after quenching.

[0033] The mesh placement cylinder 3 includes a mesh cylinder body 31, two end plates 32, a movable cylinder cover 33, a locking assembly 36, a hinge shaft 37, a limiting lug 38, and a supporting boss 39. The mesh cylinder body 31 is a cylindrical metal mesh cylinder. The two end plates 32 are fixed at both axial ends of the mesh cylinder body 31, and a lever 4 is rotatably installed between the two end plates 32. A pick-up / placement port is provided on the side of the mesh cylinder body 31, and the movable cylinder cover 33 covers the pick-up / placement port. One side of the movable cylinder cover 33 is hinged to the mesh cylinder body 31 via the hinge shaft 37, and the other side of the movable cylinder cover 33 is locked to the mesh cylinder body 31 via the locking assembly 36. The movable cylinder cover 33 adopts a mesh plate structure, allowing quenching oil to enter and exit the mesh cylinder body 31 from the movable cylinder cover 33 without affecting the immersion cooling of the fasteners.

[0034] The locking assembly 36 includes a lock seat 361, a lock tongue 362, a lock groove 363, a compression spring 364, an unlocking lever 365, and a cover opening handle 366. The lock seat 361 is fixed to the mesh cylinder 31 near the free side of the movable cylinder cover 33. The lock tongue 362 is slidably mounted inside the lock seat 361. The lock groove 363 is located on the free side of the movable cylinder cover 33. The compression spring 364 is located between the lock seat 361 and the lock tongue 362, and applies an elastic force to the lock tongue 362 in the direction of the lock groove 363. After the movable cylinder cover 33 is closed, the lock tongue 362 is inserted into the lock groove 363 under the action of the compression spring 364, thus locking the movable cylinder cover 33 to the mesh cylinder 31. The unlocking lever 365 is fixedly connected to the locking tongue 362 and extends to the outside of the mesh placement cylinder 3. The cover opening handle 366 is fixed to the outside of the movable cylinder cover 33. After the operator pulls the unlocking lever 365, the locking tongue 362 exits the locking groove 363, and then the operator can open the movable cylinder cover 33 by holding the cover opening handle 366.

[0035] The locking groove 363 has a snap-fit ​​sidewall for abutting against the locking tongue 362. After the locking tongue 362 is inserted into the locking groove 363, when the movable cylinder cover 33 is pushed outward by the fasteners inside the mesh cylinder 31, the locking tongue 362 abuts against the snap-fit ​​sidewall of the locking groove 363. Since the fasteners inside the cylinder will flip and be impacted when the actuating rod 4 drives the tilting paddle 41 to rotate, this locking method can convert the opening force on the movable cylinder cover 33 into the abutting force between the locking tongue 362 and the locking groove 363, preventing the movable cylinder cover 33 from being pushed open by the fasteners in the quenching pool 1; after the mesh placement cylinder 3 enters the quenching pool 1, even if the tilting paddle 41 continuously actuates the fasteners, the fasteners will not fall out of the mesh cylinder 31.

[0036] A support boss 39 is fixed on the end plate 32 or the mesh cylinder 31, and a limiting lug 38 is fixed on the movable cylinder cover 33. After the movable cylinder cover 33 is opened outward, the limiting lug 38 abuts against the support boss 39, keeping the movable cylinder cover 33 in the open position. After the mesh placement cylinder 3 moves to the discharge section, the operator pulls the unlocking lever 365 and opens the movable cylinder cover 33. After the limiting lug 38 abuts against the support boss 39, the movable cylinder cover 33 remains open, allowing the operator to pour out, clamp out, or pull out the quenched fasteners inside the mesh cylinder 31. After discharge, the movable cylinder cover 33 flips back towards the mesh cylinder 31, and the locking tongue 362 re-inserts into the locking groove 363 under the action of the compression spring 364, locking the mesh placement cylinder 3 again, so as to enter the next loading and quenching cycle.

[0037] The actuating rod 4 is arranged axially along the mesh cylinder 31. Both ends of the actuating rod 4 are rotatably mounted on two end plates 32. One end of the actuating rod 4 extends through one of the end plates 32 and forms a driving end. Multiple inclined paddles 41 are fixedly mounted on the actuating rod 4. These inclined paddles 41 are arranged at intervals along the length of the actuating rod 4, with adjacent inclined paddles 41 having opposite inclination directions. The outer edge of the inclined paddle 41 is a material-pushing edge, and a clearance is left between the material-pushing edge and the inner wall of the mesh cylinder 31 to prevent the inclined paddle 41 from scraping against the mesh cylinder 31 when rotating. An overflow hole 411 is provided on the inclined paddle 41, allowing quenching oil to pass through when the paddle rotates, reducing the liquid resistance on the paddle, and allowing the quenching oil to continue flushing the surface of the fasteners after passing through the paddle.

[0038] A reset element 6 is disposed between the actuating lever 4 and the end plate 32. The reset element 6 is a torsion spring; the torsion spring is sleeved on the actuating lever 4 near the driving end, with one end of the torsion spring fixed to the end plate 32 and the other end fixed to the actuating lever 4. When the pushing assembly 5 pushes the actuating lever 4 to rotate in one direction, the torsion spring is twisted and stores energy; when the pushing assembly 5 releases the push, the torsion spring drives the actuating lever 4 to reset in the opposite direction. During both the forward rotation and the reverse reset, the actuating lever 4 drives the inclined paddle 41 to move, causing the fasteners inside the mesh placement cylinder 3 to be paddled in different directions.

[0039] The driving assembly 5 includes a gear 51, a first rack 52, and a second rack 53. The gear 51 is fixedly mounted on the driving end of the actuating lever 4. The first rack 52 and the second rack 53 are fixedly mounted on the fixed frame 21 and located in the corresponding area of ​​the immersion section of the quenching pool 1. The first rack 52 and the second rack 53 are arranged alternately up and down along the conveying direction. When the mesh placement cylinder 3 moves with the annular conveyor, the gear 51 moves synchronously. When the gear 51 passes the first rack 52, the gear 51 meshes with the first rack 52 and drives the actuating lever 4 to rotate in the first direction. When the gear 51 passes the second rack 53, the gear 51 meshes with the second rack 53 and drives the actuating lever 4 to rotate in the second direction. The first direction and the second direction are opposite. The first rack 52 and the second rack 53 each include an inlet section, a meshing drive section, and a disengagement section. The inlet section is used to guide the gear 51 into meshing, the meshing drive section is used to drive the gear 51 to rotate continuously, and the disengagement section is used to allow the gear 51 to smoothly disengage from the rack.

[0040] In other embodiments, the pushing component 5 includes a set of stop bars fixedly mounted on the fixed frame 21 and an abutment bar fixedly mounted on the driving end of the actuating rod 4. The stop bar set includes a first stop bar and a second stop bar. When the abutment bar moves with the mesh placement cylinder 3 and abuts against the first stop bar, the first stop bar pushes the abutment bar, causing the actuating rod 4 to rotate in a first direction. When the abutment bar abuts against the second stop bar, the second stop bar pushes the abutment bar, causing the actuating rod 4 to rotate in a second direction. After the abutment bar passes the corresponding stop bar, the reset component 6 drives the actuating rod 4 to reset. This structure is suitable for applications requiring a small actuation angle, i.e., when the number of fasteners stored in the placement cylinder is small, a small rotation angle of the actuating rod 4 is sufficient to actuate the fasteners in the mesh placement cylinder 3. When the abutment bar disengages from the first or second stop bar, the reset component 6 drives the abutment bar to reset.

[0041] An oil guide plate is provided on the outlet side 12 of the quenching tank 1. The oil guide plate is located below the discharge section of the conveying device 2 and is inclined towards the quenching tank 1. After the mesh placement cylinder 3 leaves the quenching oil, the quenching oil dripping from the mesh cylinder 31 and the surface of the fasteners falls onto the oil guide plate and then flows back into the quenching tank 1 along the oil guide plate. The oil guide plate can catch the quenching oil that initially drips from the mesh placement cylinder 3, reducing the amount of quenching oil dripping onto the ground or subsequent equipment.

[0042] The striking assembly 7 is located on the outlet side 12 of the quenching tank 1 and above the quenching oil surface. The striking assembly 7 includes a striking arm 71, an elastic return member 72, and a striking head 73. One end of the striking arm 71 is rotatably mounted on the side wall of the quenching tank 1, and the striking head 73 is fixed to the other end of the striking arm 71. The elastic return member 72 is connected between the striking arm 71 and the quenching tank 1. A trigger protrusion 34 is provided on the outer side of the mesh placement cylinder 3. When the trigger protrusion 34 moves with the mesh placement cylinder 3 to the striking assembly 7, it pushes the striking arm 71 to deflect, causing the elastic return member 72 to be stretched or twisted. After the trigger protrusion 34 passes the striking arm 71, the elastic return member 72 drives the striking arm 71 to quickly return to its original position, and the striking head 73 strikes the outer wall of the mesh cylinder 31, causing the mesh placement cylinder 3 to vibrate. The vibration can cause the quenching oil adhering to the fastener cavity, thread gap, and mesh to detach and fall back into the oil guide plate and quenching pool 1.

[0043] Working principle: In the feeding section, the operator pulls the unlocking lever 365, causing the locking tongue 362 to disengage from the locking groove 363. Then, the operator holds the cover opening handle 366 to open the movable cylinder cover 33 and places the fasteners to be quenched into the mesh cylinder 31 through the pick-and-place port. After loading, the movable cylinder cover 33 flips back towards the mesh cylinder 31 and covers the pick-and-place port. The locking tongue 362, under the action of the compression spring 364, inserts into the locking groove 363, locking the movable cylinder cover 33. Subsequently, the conveying device 2 drives the mesh placement cylinder 3 to move along an inclined path. The mesh placement cylinder 3 enters the quenching tank 1 from the liquid inlet side 11. The quenching oil enters the mesh placement cylinder 3 through the mesh cylinder 31 and the movable cylinder cover 33 and surrounds the fasteners. As the mesh placement cylinder 3 continues to move within the immersion section, gear 51 meshes sequentially with the first rack 52 and the second rack 53. The actuating rod 4 rotates in both directions under the drive of gear 51. The resetting member 6 resets the actuating rod 4 after gear 51 disengages from the rack. During the rotation of the actuating rod 4, the tilting paddle 41 actuates the fasteners inside the mesh placement cylinder 3, causing the contact position between the fasteners to continuously change. Quenching oil enters the previously blocked gaps, carrying away heat from the fastener surface. The flow holes 411 on the tilting paddle 41 allow quenching oil to flow through the paddle, and the disturbance generated by the paddle causes continuous exchange of quenching oil inside the mesh placement cylinder 3. During this process, the movable cylinder cover 33 is locked to the mesh cylinder body 31 by the locking assembly 36. The locking tongue 362 abuts against the latching side wall of the locking groove 363. The impact generated by the paddle actuating the fasteners does not cause the movable cylinder cover 33 to open, and the fasteners are always confined within the mesh cylinder body 31. After the mesh placement cylinder 3 completes the immersion quenching, the conveying device 2 carries the mesh placement cylinder 3 away from the quenching oil and into the discharge section. After the mesh placement cylinder 3 leaves the liquid surface, the quenching oil first drips naturally from the mesh cylinder body 31 onto the oil guide plate, then triggers the protrusion 34 to push the striking arm 71 to deflect and pass over the striking arm 71. The elastic return member 72 drives the striking arm 71 to reset, and the striking head 73 strikes the mesh cylinder body 31, causing the mesh placement cylinder 3 and the internal fasteners to vibrate briefly, thereby causing the attached quenching oil to fall off further. After the mesh placement cylinder 3 reaches the discharge position, the operator pulls the unlocking lever 365 and holds the cover opening handle 366 to open the movable cylinder cover 33. The limiting lug 38 abuts against the supporting protrusion 39, keeping the movable cylinder cover 33 open. Then, the quenched fasteners are poured out, clamped out, or pulled out.

[0044] In summary, the present invention, through the cooperation of the mesh placement cylinder 3, the movable cylinder cover 33, and the locking component 36, enables the placement cylinder to be opened for loading in the feeding section, reliably locked in the quenching pool 1, and opened for unloading in the discharging section; through the cooperation of the actuating rod 4, the tilting paddle 41, the pushing component 5, and the resetting component 6, the fasteners are no longer cooled solely by static immersion in the quenching medium, but are continuously agitated and turned during the conveying process, thereby reducing the impact of stacking and bonding on the uniformity of quenching; through the cooperation of the striking component 7 and the oil guide plate, the quenching medium carried by the mesh placement cylinder 3 after liquid discharge can fall back into the quenching pool 1, reducing quenching medium loss and on-site pollution.

[0045] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A quenching apparatus for fastener production, comprising a quenching tank and a conveying device inclined and partially located within the quenching tank, characterized in that: The conveying device includes a fixed frame and an annular conveyor that moves cyclically relative to the fixed frame. Multiple mesh placement cylinders are installed at intervals along the conveying direction on the annular conveyor. The mesh placement cylinders are used to hold fasteners to be quenched. The mesh placement cylinders are cylindrical structures that can be opened and locked. A lever is rotatably installed inside the mesh placement cylinder. Multiple inclined paddles are installed at intervals along the length of the lever. One end of the lever extends out of the mesh placement cylinder and forms a driving end. The conveying device also includes a drive wheel set and a driven wheel set rotatably mounted on a fixed frame. An annular conveyor is wound between the drive wheel set and the driven wheel set. The drive wheel set is connected to the drive motor. The annular conveyor includes two parallel conveyor chains. Multiple mounting arms are provided between the two conveyor chains. The two ends of the mesh placement cylinder are respectively connected to the corresponding mounting arms. A pushing component is provided between the drive end and the fixed frame. The pushing component is used to push the actuating rod to reciprocate relative to the mesh placement cylinder when the mesh placement cylinder passes through the immersion section in the quenching tank with the annular conveyor. The mesh placement tube includes a mesh tube body, end plates fixed at both ends of the mesh tube body, a movable tube cover, and a locking assembly. The mesh tube body has a pick-up and put-out opening on its side, and the movable tube cover covers the pick-up and put-out opening. One side of the movable tube cover is hinged to the mesh tube body through a hinge shaft, and the other side of the movable tube cover is locked to the mesh tube body through the locking assembly. The driving assembly includes a gear fixedly connected to the drive end of the actuating lever and a rack assembly fixedly mounted on a fixed frame. The rack assembly includes a first rack and a second rack, both of which are located in the corresponding areas of the immersion section of the quenching tank. The first rack and the second rack are staggered along the conveying direction of the annular conveyor. When the gear moves with the mesh placement cylinder and meshes with the first rack, it drives the actuating lever to rotate in the first direction. When the gear moves with the mesh placement cylinder and meshes with the second rack, it drives the actuating lever to rotate in the second direction.

2. The quenching apparatus for fastener production according to claim 1, characterized in that, The locking assembly includes a lock seat fixed to the mesh cylinder, a lock tongue slidably installed in the lock seat, a lock groove provided on the movable cylinder cover, and a compression spring that applies an elastic force to the lock tongue in the direction of the lock groove. When the lock tongue is inserted into the lock groove, it restricts the movable cylinder cover from opening relative to the mesh cylinder.

3. The quenching apparatus for fastener production according to claim 2, characterized in that, The latch is connected to an unlocking lever located on the outside of the mesh placement cylinder. The unlocking lever is used to drive the latch out of the lock groove. An opening handle is provided on the outside of the movable cylinder cover. The unlocking lever and the opening handle are arranged adjacent to each other.

4. The quenching apparatus for fastener production according to claim 2, characterized in that, The locking groove has a snap-fit ​​sidewall for abutting against the locking tongue. When the movable cylinder cover is subjected to the thrust generated by the fasteners inside the mesh placement cylinder or the inclined lever, the locking tongue abuts against the snap-fit ​​sidewall to prevent the movable cylinder cover from opening in the quenching tank.

5. The quenching apparatus for fastener production according to claim 1, characterized in that, The end plate or mesh cylinder is provided with a support boss, and the movable cylinder cover is provided with a limiting lug. After the movable cylinder cover is opened, the limiting lug abuts against the support boss, so that the movable cylinder cover is kept in the open state.

6. The quenching apparatus for fastener production according to claim 1, characterized in that, A reset component is provided between the actuating rod and the end plate. The reset component is a torsion spring sleeved on the actuating rod. One end of the torsion spring is connected to the end plate, and the other end is connected to the actuating rod. The inclined paddle includes a connecting side fixedly connected to the actuating rod and a material-pushing side away from the actuating rod. A clearance gap is left between the material-pushing side and the inner wall of the mesh cylinder. The inclination directions of two adjacent inclined paddles are opposite. A flow hole for the quenching medium to pass through is opened on the inclined paddle.

7. The quenching apparatus for fastener production according to claim 1, characterized in that, A striking assembly is installed above the quenching medium in the quenching tank. The striking assembly is located below the discharge section of the conveying device. A trigger protrusion is provided on the outside of the mesh placement cylinder. The striking assembly includes a striking arm rotatably installed on the quenching tank, an elastic return member disposed between the striking arm and the quenching tank, and a striking head disposed at the end of the striking arm. When the trigger protrusion moves with the mesh placement cylinder, it pushes the striking arm to deflect. After the trigger protrusion passes the striking arm, the elastic return member drives the striking arm to reset, so that the striking head strikes the mesh placement cylinder.

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