Fastener Surface Treatment Device

Abstract

This invention discloses a fastener surface treatment device, belonging to the field of fastener processing technology. It mainly includes a surface treatment pre-processing component, a blackening tank, a second elevator, a draining mechanism, an airflow purging mechanism, and an oven. By setting the draining mechanism and the airflow purging mechanism above the discharge end of the second elevator, the displacement energy of the lifting plate moving horizontally with the conveyor belt is cleverly extracted as a mechanical trigger source. This drives the trigger unit to store and decouple energy, converting it into lateral thrust and rotational force. This causes the pushing cam of the swaying unit to alternately push the lifting plate laterally, and the purely mechanically linked airflow purging mechanism rotates around its axis, instantly connecting the originally misaligned air holes to spray high-pressure air knives. This invention achieves high-frequency mechanical vibration and synchronous stripping and purging of fasteners with pulsed airflow, effectively removing blackening liquid from densely threaded areas. It reduces cross-tank liquid loss without additional electrical control, improving processing quality.

Description

Technical Field

[0001] This invention relates to the field of fastener processing technology, and more particularly to a fastener surface treatment apparatus. Background Technology

[0002] After machining, fasteners typically require heat treatment and surface treatment to enhance their mechanical strength, corrosion resistance, and wear resistance. Current fastener processing commonly employs large-scale, continuous mesh belt automated production lines. Following standard industrial processes, these lines sequentially include: initial feeding via a hoist; spray cleaning to remove surface oil and impurities; high-temperature quenching to increase metal hardness; secondary hoisting and spray cleaning after quenching; tempering to relieve internal stress and stabilize the microstructure; and finally, surface blackening for rust prevention and sealing.

[0003] In the aforementioned production line, the blackening process is a crucial final step. Traditionally, a large quantity of fasteners falls via a conveyor belt into a blackening tank containing high-temperature chemicals. Immersed at the bottom of the solution, they are slowly conveyed forward by a horizontal metal conveyor belt to complete the predetermined chemical reaction. After the reaction is complete, the conveyor belt at the end of the tank switches to an upward-sloping discharge section, pulling the blackened fasteners out of the liquid. They then undergo a brief period of natural drainage under their own weight on the inclined conveyor belt. Subsequently, at the point where the conveyor belt flips, they pass through a guide chute into the tank for the next process, such as a washing tank or an oil-immersion rust-preventing tank.

[0004] Due to the dense spiral texture of fasteners, and the combined effects of their surface morphology and liquid surface tension, a large amount of high-temperature alkaline blackening liquid easily gets trapped in the thread gaps when the fasteners are lifted away from the blackening tank by the inclined conveyor belt. Traditional discharge sections rely solely on the natural gravity of the workpieces for drainage, which is insufficient to overcome surface tension and effectively separate the liquid. This carry-over phenomenon increases daily material loss of the blackening agent, driving up operating costs. Furthermore, since this production line is directly connected to the drying oven, if fasteners with undrained blackening liquid enter the oven, the moisture is quickly dried, and the remaining alkaline agent crystallizes on the fastener surface, forming white salt deposits or patches. This not only damages the product's appearance and final rust prevention performance, but the crystals also affect the assembly accuracy of the threads. Simultaneously, the released alkaline vapor accelerates the corrosion and aging of the oven's internal components.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0006] This invention provides a fastener surface treatment device to solve the technical problem that the liquid carried out when the fastener is lifted out of the tank is difficult to drain naturally, resulting in the loss of blackening agent material and the formation of crystalline salt frost during the subsequent drying process, which affects product quality and assembly accuracy.

[0007] This invention employs the following technical solution: a fastener surface treatment device. It includes a pre-treatment assembly for sequentially performing loading, cleaning, quenching, and tempering treatments on fasteners. The blackening pool is connected to the discharge end of the surface treatment pre-assembly component and is used to blacken the fasteners. The second elevator is connected to the blackening tank and has an elevator frame, an elevator mesh belt and multiple elevator plates that move with it. The elevator plates are provided with drainage holes and are slidably mounted on the elevator mesh belt. The draining mechanism is located above the discharge end of the second elevator and includes a symmetrically arranged triggering unit and a shaking unit. The triggering unit is used to store energy and transmit power when pushed by the upward displacement of the lifting plate. The shaking unit is used to generate a lateral pushing force after receiving the transmission from the triggering unit to force the lifting plate to slide left and right at high frequency, thereby shaking and draining the fasteners it carries. An airflow purging mechanism, located within the draining mechanism, is used to synchronously spray airflow onto the swaying lifting plate to purge and drain the liquid under the linkage triggering of the triggering unit. The drying oven, connected to the discharge end of the second elevator, is used to dry and cure the drained fasteners.

[0008] Furthermore, the second elevator also includes a support horizontal shaft evenly arranged along the lifting mesh belt. The lifting plate slides through the support horizontal shaft. Both ends of the support horizontal shaft are fixed with retaining edges. A return spring is connected between the retaining edge and the side of the lifting plate. In its natural state, the lifting plate is held in the center position of the support horizontal shaft by the elastic force of the return springs on both sides. The two sides of the lifting plate have baffles to prevent fasteners from falling off, forming a hopper structure. The outer sides of the two baffles are fixed with trigger side pins for pushing the trigger unit upward. When subjected to external lateral excitation force, the lifting plate is adapted to overcome the elastic force of the return spring and slide left and right along the support horizontal shaft, so as to generate reciprocating shaking on the fasteners it carries, thereby breaking the surface tension of the medicine.

[0009] Furthermore, the draining mechanism includes a top protective cover, which is fixedly installed above the discharge end of the elevator frame in a horizontal state. Two symmetrically arranged triggering units are fixedly installed on the bottom surface of the top protective cover, and two shaking units corresponding to the triggering units are also fixedly installed on the inner wall of the top protective cover.

[0010] Furthermore, each of the triggering units includes a mounting base plate, a guide slide box, a sliding rod, a bending rod, an inclined guide rod, and a connecting spring. The mounting base plate is fixed to the bottom surface of the inner wall of the top protective cover by two mounting top columns. The guide slide box is fixed to the side of the mounting base plate. The inclined guide rod is arranged inside the guide slide box with an inclined upward trend along the running direction of the lifting mesh belt.

[0011] The sliding sleeve rod is slidably sleeved on the inclined guide rod. The bent rod is fixed at the bottom end of the sliding sleeve rod. The vertical end of the bent rod is suspended on the movement path of the trigger side pin. The connecting spring is sleeved on the inclined guide rod and connects the side of the sliding sleeve rod to one end of the inner wall of the guide slide box. It is used to initially limit the sliding sleeve rod to return to one end in the guide slide box. The discharge end position of the lifting mesh belt is in a horizontal state. The lifting mesh belt is adapted to run to the discharge end position. The trigger side pin is adapted to contact and push the vertical end of the bent rod, forcing the sliding sleeve rod to overcome the elastic force of the connecting spring and slide obliquely upward along the inclined guide rod, so as to convert the longitudinal movement of the lifting mesh belt into linear transmission potential energy in the inclined direction.

[0012] Furthermore, the triggering unit also includes a push rod, a triangular plate, and a linear groove formed on the upper surface of the guide slide box. The push rod is fixed to the side of the sliding sleeve rod and extends upward. A pin is fixed to the bottom surface of the triangular plate, and the pin slides within the linear groove. The bottom surface of the triangular plate is simultaneously movably sleeved on the top of the sliding sleeve rod, and a limit spring is connected between the triangular plate and the top of the sliding sleeve rod. The triangular plate consists of a front inclined section and a rear horizontal section. A drive rack is fixed to the upper surface of the horizontal section of the triangular plate. When the sliding sleeve rod is pushed and slides obliquely upward along the inclined guide rod, the limit spring is compressed and contracts to absorb the vertical upward displacement. Under the guidance and restriction of the linear groove, the triangular plate is pushed by the sliding sleeve rod to make a pure horizontal displacement, which is used to provide the lateral feed wedge thrust and rotational driving force to the swaying unit in sequence through its inclined section and drive rack.

[0013] Furthermore, each of the swaying units includes an L-shaped rod frame, a sliding box, a bearing sleeve, and an extension rod. The vertical end of the L-shaped rod frame is connected to the top of the inner wall of the top protective cover. The sliding box is movably sleeved on the horizontal end of the L-shaped rod frame through the bearing sleeve on its top surface. Connecting springs are sleeved on both ends of the horizontal end of the L-shaped rod frame. One end of the connecting spring is connected to the side of the bearing sleeve, and the other end is connected to the vertical end of the L-shaped rod frame and the inner wall of the top protective cover, respectively, to limit the sliding box to the central position of the horizontal end of the L-shaped rod frame. The extension rod is vertical and rotatably inserted through the bottom surface of the sliding box. The side of the extension rod has a notch with the same width as the triangular plate, and the front end of the triangular plate is adapted to extend into the notch.

[0014] When the triangular plate is pushed to make a purely horizontal displacement, the inclined section of the front part of the triangular plate gradually extends into the notch and generates a wedge-shaped lateral thrust on the extension rod, forcing the sliding box to overcome the elastic force of the connecting spring and slide laterally on the L-shaped rod frame, so that the two shaking units move closer to each other to enter the contact and striking range.

[0015] Furthermore, the shaking unit also includes a central shaft, a pushing cam, and a pushing gear. The central shaft is vertically and movably disposed inside the sliding box, and its two ends are connected to the inner wall of the sliding box through torsion springs. The bottom end of the central shaft is fixedly connected to the top end of the extension rod. The pushing cam is horizontally and fixedly sleeved on the central shaft. The pushing gear is fixedly sleeved on the extension rod and located above the notch. When the triangular plate slides in the notch to its rear horizontal section, the driving rack on its upper surface meshes with the pushing gear, driving the central shaft and the pushing cam to rotate. The initial eccentric positions of the pushing cams on the two swaying units are opposite. The baffle plate has a preset width extending along the running direction of the lifting mesh belt. The pushing cam is used to alternately push the side of the baffle plate with the preset width during rotation to prolong the action time of cam contact and push, apply a continuous lateral alternating force to the lifting plate, and automatically reverse and reset under the action of the torsion spring after the drive rack disengages.

[0016] Furthermore, the airflow purging mechanism includes two support seats, an air inlet main pipe, an air inlet connector, an air blowing horizontal pipe, and push rods. The two support seats are symmetrically fixed to the top of the inner wall of the top protective cover. The air inlet main pipe is horizontally fixed between the two support seats. The air inlet connector is connected to one end of the air inlet main pipe for connection with an external air supply device. The air blowing horizontal pipe spans above the lifting mesh belt and is movably sleeved on the air inlet main pipe. Both ends of the air blowing horizontal pipe are connected to the corresponding support seats with torsion springs. The two push rods are symmetrically and vertically fixed to the bottom surface of the air blowing horizontal pipe and suspended on the movement path of the push rod.

[0017] When the sliding sleeve rod moves with the lifting mesh belt to the horizontal position section at the discharge end and slides obliquely upward, the push rod fixed on its side tilts and pushes the push rod, forcing the air blowing horizontal pipe to overcome the torsion spring torque and rotate around the axis of the air inlet pipe by a specific angle, so as to realize the dynamic following adjustment of the air blowing angle.

[0018] Furthermore, the main intake pipe is provided with several air holes at equal intervals along the axial direction, and the horizontal blowing pipe is provided with several air jet slits at equal intervals along the axial direction. In the initial state, the air jet slits and air holes are staggered to block airflow leakage. When the push rod is pushed by the push rod and drives the horizontal blowing pipe to rotate, the air jet slits rotate to the position corresponding to the air holes in the main intake pipe, so that the high-pressure airflow is instantly sprayed downward from the air jet slits. This is used to implement pulsed synchronous airflow purging while the lifting plate is laterally shaking and dripping liquid. When the push rod passes over and disengages from the push rod, the horizontal blowing pipe automatically reverses and resets under the torsion of the torsion spring, so that the air jet slits are staggered with the air holes again to block airflow.

[0019] Furthermore, the surface treatment pre-processing components, in accordance with the fastener process sequence, include in sequence a material lifting machine, a spray box connected to the discharge end of the material lifting machine, a quenching furnace connected to the spray box, an oil pool connected to the quenching furnace, a first elevator set adjacent to the oil pool, and a tempering furnace connected to the discharge end of the first elevator. The blackening pool is arranged side by side on one side of the discharge end of the tempering furnace.

[0020] The above-mentioned at least one technical solution adopted in this invention can achieve the following beneficial effects: The fastener surface treatment device forms a continuous, automated surface treatment production line by sequentially connecting the pre-treatment components, blackening tank, second elevator, and drying oven. A draining mechanism and an airflow purging mechanism are installed above the discharge end of the second elevator to extract the physical kinetic energy of the conveyor belt. A trigger unit mechanically stores and transmits this energy when pushed upwards by the lifting plate, driving a swaying unit to generate a lateral alternating thrust. This forces the elastically sliding lifting plate with draining holes to slide left and right, physically shaking the fasteners and disrupting the surface tension of residual blackening solution at the densely threaded areas. Simultaneously, under the pure mechanical linkage of the trigger unit, the airflow purging mechanism synchronously and instantaneously sprays airflow onto the high-frequency swaying lifting plate for purging and draining. This solution integrates high-frequency mechanical vibration draining with synchronous airflow pulse purging, solving the problem of easy retention and carryover of blackening solution after fastener blackening, avoiding cross-tank loss and waste of blackening solution, and improving the final drying and curing efficiency and processing quality of the fasteners. Attached Figure Description

[0021] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0022] In the attached diagram: Figure 1 This is an overall schematic diagram of the fastener surface treatment device in this application; Figure 2 for Figure 1 Schematic diagram of the second elevator and drying oven; Figure 3 for Figure 2 A partial structural schematic diagram of the second hoist in the middle; Figure 4 for Figure 3 Enlarged structural diagram at point A in the diagram; Figure 5 for Figure 3 A partial structural schematic diagram of the second hoist in the middle; Figure 6 for Figure 5 A magnified structural diagram at point B; Figure 7 for Figure 3 A partial structural schematic diagram of the second hoist in the middle; Figure 8 for Figure 7 A magnified structural diagram at point C; Figure 9 for Figure 7 A schematic diagram of the bottom structure; Figure 10 for Figure 9 A magnified structural diagram at point D.

[0023] Figure label: 1. Material hoist; 2. Spray box; 3. Quenching furnace; 4. Oil tank; 41. First elevator; 5. Tempering furnace; 6. Second elevator; 61. Elevator frame; 62. Elevating mesh belt; 63. Elevating plate; 631. Trigger side pin; 632. Drainage hole; 64. Supporting horizontal shaft; 641. Stop; 7. Drying oven; 8. Drainage mechanism; 81. Top protective cover; 82. Mounting base plate; 83. Mounting top column; 84. Guide slide box; 841. Sliding sleeve rod; 842. 843. Bending rod; 844. Inclined guide rod; 845. Connecting spring; 846. Push rod; 87. Triangular plate; 88. L-shaped rod frame; 89. Sliding box; 801. Bearing sleeve; 812. Extension rod; 83. Push gear; 843. Connecting spring; 85. Central shaft; 86. Pushing cam; 97. Airflow purging mechanism; 98. Support seat; 99. Main air intake pipe; 901. Air intake connector; 91. Air blowing horizontal pipe; 92. Air jet slit; 93. Push rod. Detailed Implementation

[0024] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0025] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] Reference Figures 1-10 As shown, this invention provides a fastener surface treatment apparatus, including a surface treatment pre-processing assembly, a blackening tank, a second elevator 6, a draining mechanism 8, an airflow purging mechanism 9, and an oven 7. The surface treatment pre-processing assembly, in the fastener process sequence, includes, in sequence, a lifting machine 1, a spray box 2 connected to the discharge end of the lifting machine 1, a quenching furnace 3 connected to the spray box 2, an oil tank 4 connected to the quenching furnace 3, a first elevator 41 adjacent to the oil tank 4, and a tempering furnace 5 connected to the discharge end of the first elevator 41. The blackening tank is arranged side-by-side on one side of the discharge end of the tempering furnace 5, used for surface blackening treatment of fasteners that have undergone tempering heat treatment. The second elevator 6 is used to lift the blackened fasteners from the blackening tank to the oven 7, which is connected to the discharge end of the second elevator 6, used for high-temperature drying and curing of the drained fasteners. Through the above modular streamlined layout, continuous automated processing of fasteners from feeding to final drying is achieved.

[0027] To address the issue of blackening solution being easily trapped and carried out due to the dense threads on fasteners, a second elevator 6 is connected to the blackening pool. The second elevator 6 has an elevator frame 61, an elevator mesh belt 62, and multiple elevator plates 63 that move with it. The elevator plates 63 are provided with drainage holes 632. The second elevator 6 also includes a support horizontal shaft 64 evenly arranged along the surface of the elevator mesh belt 62. The elevator plates 63 slide on the support horizontal shaft 64. Both ends of the support horizontal shaft 64 are fixed with retaining edges 641, and a return spring is connected between the retaining edges 641 and the side of the elevator plates 63.

[0028] In its natural state, the lifting plate 63 is kept in the center position of the supporting horizontal axis 64 under the elastic balance of the return springs on both sides. The two sides of the lifting plate 63 have baffles to limit the fasteners from falling, forming a hopper structure. The outer sides of the two baffles are fixed with trigger side pins 631. When subjected to external lateral excitation force, the lifting plate 63 can overcome the elastic force of the return spring and slide back and forth along the supporting horizontal axis 64. The displacement change produces a shaking effect on the fasteners it carries, effectively destroying the surface tension of the liquid on the fastener surface and accelerating liquid peeling.

[0029] In order to provide accurate lateral excitation force to the lifting plate 63, a draining mechanism 8 is provided above the discharge end of the second elevator 6. The draining mechanism 8 includes a top protective cover 81 fixedly installed above the discharge end of the elevator frame 61 in a horizontal state. Two symmetrically arranged triggering units are fixedly installed on the bottom surface of the top protective cover 81, and two shaking units corresponding to the triggering units are also fixedly installed on the inner wall of the top protective cover 81.

[0030] Specifically, each triggering unit includes a mounting base plate 82, a guide slide box 84, a sliding sleeve rod 841, a bending rod 842, an inclined guide rod 843, and a connecting spring 844. The mounting base plate 82 is fixed to the bottom surface of the inner wall of the top protective cover 81 by two mounting top posts 83. The guide slide box 84 is fixed to the side of the mounting base plate 82. The inclined guide rod 843 is set inside the guide slide box 84 with a slightly upward trend along the running direction of the lifting mesh belt 62. The sliding sleeve rod 841 is slidably sleeved on the inclined guide rod 843. The bending rod 842 is fixed to the bottom end of the sliding sleeve rod 841. The vertical end of the bending rod 842 hangs on the moving path of the trigger side pin 631. The connecting spring 844 is sleeved on the inclined guide rod 843 and connects the side of the sliding sleeve rod 841 to one end of the inner wall of the guide slide box 84, which is used to initially limit the end of the sliding sleeve rod 841 to return to its original position inside the guide slide box 84.

[0031] To ensure smooth transmission, the triggering unit also includes a push rod 845, a triangular plate 85, and a linear groove on the upper surface of the guide slide box 84. The push rod 845 is fixed to the side of the slide sleeve rod 841 and extends upward. A pin is fixed to the bottom surface of the triangular plate 85. The pin slides within the linear groove. At the same time, the bottom surface of the triangular plate 85 is movably sleeved on the top of the slide sleeve rod 841, and a limit spring is connected between the bottom surface of the triangular plate 85 and the top of the slide sleeve rod 841.

[0032] The triangular plate 85 consists of a front inclined section and a rear horizontal section. A drive rack (not shown in the figure) is fixed on the upper surface of the horizontal section of the triangular plate 85. When the lifting conveyor belt 62 runs to the discharge end position, that is, when it changes from an incline to a horizontal state, the trigger pin 631 is triggered to contact and push the vertical end of the bent rod 842 horizontally forward, forcing the sliding sleeve rod 841 to overcome the elastic force of the connecting spring 844 and slide obliquely upward along the inclined guide rod 843. During this process, due to the anti-deflection guiding constraint of the pin and the linear slide groove, the limiting spring is compressed to absorb the vertical upward displacement component, so that the triangular plate 85 is pushed by the sliding sleeve rod 841 to make a pure horizontal displacement. This motion design smoothly converts the longitudinal power of the lifting conveyor belt 62 into horizontal linear transmission potential energy.

[0033] When the triangular plate 85 makes a horizontal displacement, its inclined section and drive rack provide the lateral feed wedge thrust and rotational drive force to the swaying unit in sequence. Each swaying unit includes an L-shaped rod 86, a sliding box 87, a bearing sleeve 871, and an extension rod 872. The vertical end of the L-shaped rod 86 is connected to the top of the inner wall of the top protective cover 81. The sliding box 87 is movably sleeved on the horizontal end of the L-shaped rod 86 through the bearing sleeve 871 on its top surface. Connecting springs 88 are sleeved on the horizontal end of the L-shaped rod 86 near both ends. One end of each connecting spring 88 is connected to the side of the bearing sleeve 871, and the other end is connected to the vertical end of the L-shaped rod 86 and the inner wall of the top protective cover 81, respectively, to limit the sliding box 87 to the central position of the horizontal end of the L-shaped rod 86.

[0034] The extension rod 872 is vertically and rotatably installed on the bottom surface of the sliding box 87. At the same time, a notch with the same width as the triangle plate 85 is opened on the side of the extension rod 872. The front end of the triangle plate 85 is suitable to extend into the notch. When the triangle plate 85 moves horizontally in the direction of travel, the inclined section of the front part of the triangle plate 85 gradually extends into the notch. Using the principle of the inclined plane, a wedge-shaped lateral thrust is generated on the extension rod 872, which forces the sliding boxes 87 on both sides to overcome the elasticity of the connecting spring 88 and slide laterally on the L-shaped rod frame 86, so that the two swaying units move closer to each other to enter the contact and striking range of the lower lifting plate 63.

[0035] Once the shaking unit enters the impact range, it switches from linear transmission to rotary vibration transmission. The shaking unit also includes a central shaft 89, a push cam 812, and a push gear 873. The central shaft 89 is vertically rotatably mounted inside the sliding box 87, and its two ends are connected to the inner wall of the sliding box 87 via torsion springs. The bottom end of the central shaft 89 is fixedly connected to the top end of the extension rod 872. The push cam 812 is horizontally fixedly sleeved on the central shaft 89, and the push gear 873 is fixedly sleeved on the extension rod 872 and located above the notch.

[0036] When the triangular plate 85 slides into the notch to its rear horizontal section, the drive rack on its upper surface meshes with the push gear 873, causing the central shaft 89 and the push cam 812 to rotate. The initial eccentric positions of the push cams 812 on the two wobbling units are opposite, and the lower baffle plate has a preset width extending along the running direction of the lifting mesh belt 62. When the push cam 812 rotates, it will alternately push the side of the baffle plate with a preset width. This physical length can effectively extend the action time of the cam contact push, avoiding failure of a single impact, thereby applying a continuous and high-frequency lateral alternating force to the lifting plate 63. When the lifting plate 63 moves away with the lifting mesh belt 62 and the drive rack disengages, the central shaft 89 automatically reverses and resets under the reset force of the torsion spring, waiting for the next cycle.

[0037] As the lifting plate 63 sways laterally to drain the liquid, the airflow purging mechanism 9, located within the draining mechanism 8, is simultaneously triggered. The airflow purging mechanism 9 includes a support base 91, an air inlet main pipe 92, an air inlet connector 921, a horizontal air blowing pipe 93, and a push rod 94. Two support bases 91 are symmetrically fixed to the top of the inner wall of the top protective cover 81, the air inlet main pipe 92 is horizontally fixed between the two support bases 91, and the air inlet connector 921 is connected and fixed to one end of the air inlet main pipe 92 for connection to external high-pressure air supply equipment.

[0038] The air-blowing horizontal pipe 93 spans above the lifting mesh belt 62 and is movably sleeved on the air intake manifold 92. Both ends of the air-blowing horizontal pipe 93 are connected to the corresponding support seats 91 with torsion springs for initial reset. Two push rods 94 are symmetrically and vertically fixed to the bottom surface of the air-blowing horizontal pipe 93 and suspended along the movement path of the push rod 845. To achieve instantaneous energy storage and ejection, the air intake manifold 92 has several air holes equidistantly spaced along the axial direction, and the air-blowing horizontal pipe 93 has several air jet slits 931 equidistantly spaced along the axial direction. In the initial state, the air jet slits 931 and the air holes are physically staggered to intercept and block the leakage of internal airflow.

[0039] When the sliding sleeve rod 841 moves with the lifting mesh belt 62 to the horizontal position at the discharge end and slides obliquely upward, the push rod 845 fixed to its side tilts and pushes the push rod 94 in front. This action forces the air blowing horizontal pipe 93 to overcome the torsion spring torque and rotate around the axis of the air inlet main pipe 92 by a specific angle. This rotation causes the air jet slit 931 to rotate to a position corresponding to the air hole in the air inlet main pipe 92. The high-pressure airflow in the pipe is instantly ejected downward at high speed from the air jet slit 931, realizing dynamic following and adjustment of the blowing angle of the material below, and performing pulsed synchronous airflow purging on the fasteners that are in a swaying state.

[0040] As the push rod 845 continues to move forward and completely disengages from the push rod 94, the air blowing horizontal pipe 93 automatically reverses and resets instantly under the torque of the end torsion spring, causing the air jet slot 931 to re-align with the air hole to close the air passage. This mechanism is physically linked and requires no additional sensors or solenoid valve control, enabling the application of transient high-pressure air blowing to peel off fasteners when they are shaken and tumbling, thus avoiding serious carry-out of the blackening bath liquid and cross-battery loss problems.

[0041] The overall working principle of the fastener surface treatment device of the present invention is as follows: After undergoing preliminary high-temperature and cooling surface treatment via the conveyor 1, spray box 2, quenching furnace 3, oil tank 4, first elevator 41, and tempering furnace 5, the fasteners fall into the blackening tank for chemical blackening. Subsequently, the fasteners with blackening liquid adhering to their surfaces are intercepted by the lifting plate 63 of the second elevator 6 and lifted upwards. When the conveyor belt 62 reaches the top discharge end, its trajectory changes from a smooth, inclined climb to a horizontal running state, and the lifting plate 63 carrying the fasteners moves horizontally accordingly. At this time, the trigger pins 631 fixed to the outer sides of the baffles on both sides of the lifting plate 63 move horizontally forward with the conveyor belt and contact and push the vertical end of the bent rod 842 suspended directly in front of its linear movement path. This pushing action triggers the draining mechanism 8 and the airflow purging mechanism 9 suspended above the discharge end, converting the unidirectional linear motion kinetic energy of the conveyor belt 62, which was originally used for conveying, into the initial mechanical trigger source for subsequent physical draining and pneumatic purging.

[0042] As the trigger pin 631 continues to advance horizontally, the bending rod 842, under force, drives the sliding rod 841 to overcome the tension of the connecting spring 844 and slide obliquely upward along the inclined guide rod 843. During this period, the limiting spring is compressed and absorbs all the vertical upward displacement components, so that the top triangular plate 85, under the guidance and restriction of the straight slide groove, retains only pure horizontal displacement. The inclined section at the front end of the triangular plate 85 extends into the notch of the extension rod 872, and the inclined component force forces the sliding boxes 87 on both sides to overcome the resistance of the end connecting spring 88 and slide laterally towards the center, causing the shaking unit to move closer and enter the striking range; Next, the drive rack on the horizontal plane of the rear section of the triangular plate 85 meshes with the push gear 873, converting the linear thrust into rotational torque, which drives the central shaft 89 and the two push cams 812 with opposite eccentric directions at the bottom to rotate synchronously. The rotating push cams 812 continuously strike and squeeze the side of the lower baffle plate with a preset width, forcing the lifting plate 63 to overcome the elasticity of the return springs at both ends of the horizontal shaft and sway left and right along the supporting horizontal shaft 64, breaking the surface tension of the blackening liquid at the dense threads on the surface of the fastener, and causing the residual liquid to fall down along the drain hole 632 at the bottom of the lifting plate 63.

[0043] As the lifting plate 63 shakes and drains liquid, the airflow-linked purging action intervenes simultaneously. The push rod 845, fixed to the side of the sliding sleeve rod 841, moves forward and upward in sync with the tilting displacement of the main body, forcefully pushing against the push rod 94 directly in front. After the push rod 94 is pushed, it forces the air-blowing horizontal pipe 93, spanning above the conveyor belt, to overcome the torque of the end torsion spring and forcibly rotate around the axis of the internally fixed air intake manifold 92 by a specific angle, causing the air jet slots 931 on the air-blowing horizontal pipe 93 to align with the high-pressure air holes inside the air intake manifold 92. At this time, the high-pressure airflow forms a powerful air knife downwards from the air jet slots 931, simultaneously stripping and purging the shaking fasteners.

[0044] As the lifting conveyor belt 62 continues to move forward, the trigger side pin 631 completely passes over the bending rod 842, and the push rod 845 is also completely disengaged from the push rod 94. At this time, the air blowing horizontal pipe 93, the central shaft 89, the sliding box 87, and the sliding sleeve rod 841 immediately reset under the elastic force of their respective torsion springs, connecting springs 88 and 844. The air jet slot 931 is repositioned to cut off the high-pressure air path, the gear and rack disengage, the triangular plate 85 returns to its original position, and the entire draining mechanism 8 and the airflow purging mechanism 9 return to their initial reset state, waiting for the next lifting plate 63 carrying fasteners to run to the trigger position, thereby realizing the automated continuous cycle of material draining and purging operations.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A fastener surface treatment apparatus, characterized in that, include: The surface treatment pre-processing assembly is used to sequentially process fasteners by feeding, cleaning, quenching and tempering. The blackening pool is connected to the discharge end of the surface treatment pre-assembly component and is used to blacken the fasteners. The second elevator (6) is connected to the blackening pool and has an elevator frame (61), an elevator mesh belt (62) and multiple elevator plates (63) that move with it. The elevator plates (63) are provided with drainage holes (632) and are slidably mounted on the elevator mesh belt (62). The draining mechanism (8) is installed above the discharge end of the second elevator (6) and includes a triggering unit and a shaking unit arranged symmetrically. The triggering unit is used to store energy and transmit power under the push of the upward displacement of the lifting plate (63). The shaking unit is used to generate a lateral pushing force after receiving the transmission of the triggering unit to force the lifting plate (63) to slide left and right at high frequency, and generate shaking and draining of the fasteners it carries. An airflow purging mechanism (9) is provided inside the draining mechanism (8) and is used to synchronously spray airflow onto the lifting plate (63) which is in a shaking state to purge and drain it under the linkage triggering of the triggering unit. The oven (7) is connected to the discharge end of the second elevator (6) and is used to dry and cure the drained fasteners.

2. The fastener surface treatment apparatus according to claim 1, characterized in that: The second elevator (6) also includes a support horizontal shaft (64) evenly arranged along the lifting mesh belt (62). The lifting plate (63) slides through the support horizontal shaft (64). Both ends of the support horizontal shaft (64) are fixed with retaining edges (641). A return spring is connected between the retaining edge (641) and the side of the lifting plate (63). In the natural state, the lifting plate (63) is held in the middle position of the support horizontal shaft (64) under the elastic force of the return springs on both sides. The two sides of the lifting plate (63) have baffles to restrict the fasteners from falling to form a hopper structure. The outer sides of the two baffles are fixed with trigger side pins (631) for pushing the trigger unit upward. When subjected to external lateral excitation force, the lifting plate (63) is adapted to overcome the elastic force of the return spring and slide left and right along the support horizontal shaft (64) to generate reciprocating shaking on the fasteners it carries, so as to destroy the surface tension of the medicine.

3. The fastener surface treatment apparatus according to claim 2, characterized in that: The draining mechanism (8) includes a top protective cover (81), which is fixedly installed above the discharge end of the elevator frame (61) in a horizontal state. Two symmetrically arranged triggering units are fixedly installed on the bottom surface of the top protective cover (81), and two shaking units corresponding to the triggering units are also fixedly installed on the inner wall of the top protective cover (81).

4. The fastener surface treatment apparatus according to claim 3, characterized in that: Each of the triggering units includes a mounting base plate (82), a guide slide box (84), a sliding rod (841), a bending rod (842), an inclined guide rod (843), and a connecting spring (844). The mounting base plate (82) is fixed to the bottom surface of the inner wall of the top protective cover (81) by two mounting top posts (83). The guide slide box (84) is fixed to the side of the mounting base plate (82). The inclined guide rod (843) is set inside the guide slide box (84) with an inclined upward trend along the running direction of the lifting mesh belt (62). The sliding sleeve rod (841) is slidably sleeved on the inclined guide rod (843). The bent rod (842) is fixed to the bottom end of the sliding sleeve rod (841). The vertical end of the bent rod (842) hangs on the moving path of the trigger side pin (631). The connecting spring (844) is sleeved on the inclined guide rod (843) and connects the side of the sliding sleeve rod (841) to one end of the inner wall of the guide slide box (84), and is used to initially limit the return of the sliding sleeve rod (841) to the guide. At one end of the sliding box (84), the discharge end of the lifting mesh belt (62) is in a horizontal state. The lifting mesh belt (62) is adapted to run to the discharge end position. The trigger side pin (631) is adapted to contact and push the vertical end of the bending rod (842), forcing the sliding sleeve rod (841) to overcome the elastic force of the connecting spring (844) and slide obliquely upward along the inclined guide rod (843) so as to convert the longitudinal movement of the lifting mesh belt (62) into linear transmission potential energy in the inclined direction.

5. The fastener surface treatment apparatus according to claim 4, characterized in that: The triggering unit also includes a push rod (845), a triangular plate (85), and a linear groove formed on the upper surface of the guide slide box (84). The push rod (845) is fixed to the side of the sliding sleeve rod (841) and extends upward. A pin is fixed to the bottom surface of the triangular plate (85), and the pin slides within the linear groove. The bottom surface of the triangular plate (85) is simultaneously movably sleeved on the top of the sliding sleeve rod (841), and a limit spring is connected between the triangular plate (85) and the top of the sliding sleeve rod (841). The triangular plate (85) moves from the front... The segment consists of an inclined segment and a horizontal segment. A drive rack is fixed on the upper surface of the triangular plate (85) located in the horizontal segment. When the sliding sleeve rod (841) is pushed and slides obliquely upward along the inclined guide rod (843), the limiting spring is compressed to absorb the vertical upward displacement. Under the guidance and restriction of the straight slide groove, the triangular plate (85) is pushed by the sliding sleeve rod (841) to make a pure horizontal displacement, which is used to provide the lateral feed wedge thrust and rotational driving force to the swaying unit in sequence through its inclined segment and drive rack.

6. The fastener surface treatment apparatus according to claim 5, characterized in that: Each of the aforementioned swaying units includes an L-shaped rod frame (86), a sliding box (87), a bearing sleeve (871), and an extension rod (872). The vertical end of the L-shaped rod frame (86) is connected to the top of the inner wall of the top protective cover (81). The sliding box (87) is movably sleeved on the horizontal end of the L-shaped rod frame (86) through the bearing sleeve (871) on its top surface. Connecting springs (88) are sleeved on both ends of the horizontal end of the L-shaped rod frame (86), and one end of the connecting spring (88) is respectively connected to the... The bearing sleeve (871) is connected to the side, and the other end is connected to the vertical end of the L-shaped rod (86) and the inner wall of the top protective cover (81) respectively, so as to limit the sliding box (87) to be in the center position of the horizontal end of the L-shaped rod (86). The extension rod (872) is vertical and rotatably through the bottom surface of the sliding box (87). The side of the extension rod (872) is provided with a notch groove with the same width as the triangular plate (85). The front end of the triangular plate (85) is adapted to extend into the notch groove. When the triangular plate (85) is pushed to make a pure horizontal displacement, the inclined section of the front part of the triangular plate (85) gradually extends into the notch and generates a wedge-shaped lateral thrust on the extension rod (872), forcing the sliding box (87) to overcome the elastic force of the connecting spring (88) and slide laterally on the L-shaped rod frame (86), so that the two shaking units move closer to each other to enter the contact striking range.

7. The fastener surface treatment apparatus according to claim 6, characterized in that: The shaking unit also includes a central shaft (89), a push cam (812), and a push gear (873). The central shaft (89) is vertically and movably disposed inside the sliding box (87), and its two ends are connected to the inner wall of the sliding box (87) through torsion springs. The bottom end of the central shaft (89) is fixedly connected to the top end of the extension rod (872). The push cam (812) is horizontally fixedly sleeved on the central shaft (89). The push gear (873) is fixedly sleeved on the extension rod (872) and located above the notch. When the triangular plate (85) slides in the notch to the horizontal section of its rear section, the drive rack on its upper surface meshes with the push gear (873), driving the central shaft (89) and the push cam (812) to rotate. The initial eccentric positions of the push cams (812) on the two swaying units are opposite. The baffle has a preset width extending along the running direction of the lifting mesh belt (62). The push cams (812) are used to alternately push the side of the baffle with the preset width during rotation to prolong the action time of the cam contact push, apply a continuous lateral alternating force to the lifting plate (63), and automatically reverse and reset under the action of the torsion spring after the drive rack disengages.

8. The fastener surface treatment apparatus according to claim 5, characterized in that: The airflow purging mechanism (9) includes two support seats (91), an air intake manifold (92), an air intake connector (921), an air blowing horizontal pipe (93), and a push rod (94). The two support seats (91) are symmetrically fixed to the top of the inner wall of the top protective cover (81). The air intake manifold (92) is horizontally fixed between the two support seats (91). The air intake connector (921) is connected to one end of the air intake manifold (92) for connection with an external air supply device. The air blowing horizontal pipe (93) spans above the lifting mesh belt (62) and is movably sleeved on the air intake manifold (92). Both ends of the air blowing horizontal pipe (93) are connected to the corresponding support seats (91) with torsion springs. The two push rods (94) are symmetrically and vertically fixed to the bottom surface of the air blowing horizontal pipe (93) and suspended on the moving path of the push rod (845). When the sliding sleeve rod (841) moves with the lifting mesh belt (62) to the horizontal position of the discharge end and slides obliquely upward, the push rod (845) fixed on its side tilts and pushes the push rod (94), forcing the air blowing horizontal pipe (93) to overcome the torsion spring torsion and rotate around the axis of the air inlet pipe (92) by a specific angle, so as to realize the dynamic following adjustment of the blowing angle.

9. The fastener surface treatment apparatus according to claim 8, characterized in that: The main intake pipe (92) has several air holes equidistantly arranged along the axial direction, and the horizontal blowing pipe (93) has several jet strips (931) equidistantly arranged along the axial direction. In the initial state, the jet strips (931) and the air holes are staggered to block the airflow leakage. When the push rod (94) is pushed by the push rod (845) and drives the horizontal blowing pipe (93) to rotate, the jet strips (931) rotate to the position corresponding to the air holes in the main intake pipe (92), so that the high-pressure airflow is sprayed downward from the jet strips (931) instantly. This is used to implement pulsed synchronous airflow purging while the lifting plate (63) is laterally shaking and dripping liquid. When the push rod (845) passes over and disengages from the push rod (94), the horizontal blowing pipe (93) automatically reverses and resets under the torsion of the torsion spring, so that the jet strips (931) are staggered with the air holes again to block the airflow.

10. The fastener surface treatment apparatus according to claim 1, characterized in that: The surface treatment pre-processing components, in the fastener process sequence, include a material lifting machine (1), a spray box (2) connected to the discharge end of the material lifting machine (1), a quenching furnace (3) connected to the spray box (2), an oil pool (4) connected to the quenching furnace (3), a first elevator (41) set adjacent to the oil pool (4), and a tempering furnace (5) connected to the discharge end of the first elevator (41). The blackening pool is arranged side by side on one side of the discharge end of the tempering furnace (5).

Images